1333522 ⑴ 九、發明部明， [發明所屬之技術領域】 本發明是有關在鋼管（套筒；casing )內插入著：於 前端裝設工具本體的鑽孔桿而構成，利用工具本體一面在 地盤內形成鑽鑿孔，一面插入鋼管的鑽孔作業中所使用的 鑽鑿工具，以及在使用了這種鑽鑿工具的鑽孔作業之後， 再將注入劑注入以補強地盤的鋼管先撐工法。 此外，本發明是有關在套筒內插入著：於前端裝設工 具本體的鑽孔桿而構成，利用工具本體一面在地盤內形成 鑽繫孔’ 一面插入套筒，並且依序地連接鑽孔桿以及套筒 以形成預定的深度的鑽孔作業中所使用的鑽鑿工具。 【先前技術】 一般而言，在隧道挖掘工程中，當挖掘地質條件較差 的地盤時，爲了防止隧道壁面的鬆動，有的是採用：預先 將地盤補強後才進行挖掘隧道的工法。以往的隧道工程所 實施的這種地盤先行補強工法，是稱爲「鋼管先撐工 法」，是一面連結複數個鋼管，一面以控掘隧道所使用的 油壓鑿孔機從控掘面的周邊部朝向隧道軸方向的斜外方向 埋設鋼管，將注入劑注入到被埋設於隧道挖掘區域外的鋼 管，以補強地盤的工法。 這種鋼管先撐工法的槪略施工狀況是如第5圖所示。 該圖是沿著施工中的燧道1的隧道控掘面2附近的行進方 向的斷面圖，隧道1的上面是施作了混凝土、鋼材等所成 (2) (2)1333522 的補強材3.，而以雙點鏈線4所表示的是與隧道1相連續 的預定挖掘的範圍。又，爲了補強地盤，而在於隧道1以 及控掘範圍的外側，埋設了複數個鋼管5，而圖中也顯示 出：正連結於油壓鑿孔機6的施工中的鋼管5 ;以及被注 入了注入劑之施工後的鋼管5。基端部被連結於裝設在油 壓鑿孔機6的伸縮臂7上的鑽鑿工具是具有：用以傳達打 擊力和旋轉力的內桿；和裝設在內桿的前端的鑽頭；和供 插入鑽頭與內桿的鋼管5。鋼管5與內桿之間，保有預定 尺寸的間隙，鑽頭則是較鋼管5更朝前端側突出。此外， 用來供給鑽鑿用水的流路則是被形成貫通內桿，爲了朝向 所鑕鑿的地方噴出鑽鑿用水，在鑽頭上形成了流體供給 □。 隨著在最前頭進行鑽鑿的鑽頭的前進，不斷地將鋼管 5插入到鑽鑿孔內，並且依序連結內桿以及鋼管5而將鋼 管5埋設到預定的深度爲止。此時，因鑽鑿而產生的土 砂、岩屑等的鑽鑿屑，是受到經由內桿來供給的高壓鑽鑿 用水的推擠流出而鋼管5與內桿之間的間隙排出到鑽鑿孔 的外部。在結束這種鑽孔作業之後，鑽頭與內桿將被回 收，而在進行注入作業時，注入劑8被注入到鋼管5內， 然後注入劑8再從鋼管5滲透到地盤而予以補強。在這種 注入作業中，是從安裝在鋼管5上的篩孔的止回閥將注入 劑8往地盤側吐出（例如：請參考專利文獻])。 〔專利文獻1〕 -6- (3) (3)1333522 此處的·專利文獻1是指：日本特開平8-121073號公 報（第1圖）。 〔本發明所欲解決的課題〕 然而’在上述的鋼管先撐工法中，當進行鑽孔作業 時’會因爲鑽鑿用水從鑽鑿的地方滲透到達地盤中的緣 故’如果鑽鑿孔與地表之間的覆土較淺的情況下，會有對 於地表上的構造物等帶來不良的影響之虞，另外，如果是 軟質地層的情況下’則會有導致地盤鬆動之虞。此外，有 時候鑽鑿用水也會從用以吐出注入劑的篩孔流出來，而滲 透到地盤中。爲了避免這種事態，就是要不使用鑽鑿用 水’或者是必須要減少鑽鑿用水的使用量。但是，如此一 來’將又會導致鑽鑿屑堆積在鋼管與內桿間的間隙，而存 有降低排出鑽鑿屑的性能之問題。是以，因爲鑕鑿屑變得 不易排出，所以不僅鑽鑿速度極端地變慢，而且有無法繼 續進行鑽孔作業之虞。此外，即使想要以高壓空氣來取代 鑽鑿用水來排出鑽鑿屑，也無法獲得充分的排出性能。 再者，專利文獻1所揭示的這種結構，其鋼管5上的 篩孔是利用進行注入作業時的注入劑的內壓將止回閥撐開 或者將止回閥分離而開放的，鋼管的外側就是鑽鑿孔的孔 壁，會有因受到孔壁的妨礙，導致止回閥無法打開之虞。 特別是因鑽鑿狀態的不同，有時候土砂會塞在鋼管與鑽鑿 孔之間，會有因這些土砂的壓力而妨礙止回閥的開啓之問 題。是以，因爲止回閥變得難以開啓，而注入劑難以從篩 -7- (4) (4)1333522 孔吐出，無.法獲得充分地強化地盤的效果。 此外，在上述的鋼管先撐工法中，如果是控掘像黏土 般的黏度很高且流動性很差的地層的情況下，通過鋼管5 與內桿之間的間隙的鑽鑿屑會堆積在這個間隙而有導致降 低排出效率的問題。並且這樣地堆積起來的鑽鑿屑將會依 序地堆疊在一·起=而會變成無法排出鑽鑿屑，如此一來， 將會有無法繼續再進行鑽孔作業之虞。又，當軟質地層的 情況下，爲了要抑制因鑽鑿用水所導致的地盤軟化，而 且，當鑽鑿孔與地表之間的覆土很淺的情況下，爲了抑制 其帶給地表上的構造物的影響，必須要降低鑽鑿用水的使 用量。有時候，則是必須使用空氣來取代鑽鑿用水，在這 種情況下，鑽鑿屑的堆積將會特別構成問題》 本發明是在這種背景之下而開發完成的，其目的是在 於提供：可防止由鑽鑿用水所導致的地盤的鬆動，可順暢 地排出鑽鑿屑的鑽鑿工具；以及使用這種鑽鑿工具而可確 實地獲得地盤補強效果的鋼管先撐工法。 此外，本發明之目的是在於提供：一種使用於鋼管先 撐工法的鑽鑿工具，可順暢地排出鑕鑿屑，不會拖慢鑽孔 作業的鑽鑿工具。 此外，本發明之目的是在於提供：一種可順暢地排出 鑽鑿屑，不會拖慢鑽孔作業的鑽鏊工具。 【發明內容】 〔用以解決課題之手段〕 -8 - (5) (5)l333522 爲了達，成上述目的，本發明提出下列的方案。 本發明的鑽鑿工具’是備有：可在於軸線的周圍旋轉 驅動的鑽孔桿；和裝設在該鑽孔桿的鑽鑿進行方向的前方 的工具本體；和在插入著鑽孔桿的狀態下，對於該鑽孔桿 尙保有預定的間隙的圓筒狀的鋼管而構成的鑽鑿工具，其 b徵爲·在上述工具本體上’開設有對上述軸線方向前方 供給鑕鑿用水的流路；與該流路相連通之用來噴出鑽鑿用 水的流體供給口是只形成於從鋼管內部開口的位置。 依據本發明的鑽鑿工具，工具本體的流路相連通之用 來噴出鑽鑿用水的流體供給口是只形成於從鋼管內部開口 的位置，也就是說’流體供給口的開口位置只形成在於較 之鋼管的前端部更爲靠近基端側的位置，所以從鑽孔桿供 給到沿著軸線設在工具本體上的流路的鑽鑿用水，會從流 體供給口朝鋼管內部噴出。所噴出的鑽鑿用水將會形成宛 如朝向鋼管和鑽孔桿之間的間隙推擠鑽鑿屑般的水流，可 抑制鑽鑿用水朝向鑽鑿處所流動，所以可防止：因鑽鑿用 水從鑽鑿處所滲透到地盤中所導致的地盤鬆動的現象。換 言之’以往的流體供給口是形成在較之鋼管的前端部的更 爲前端側而且朝向鑽鑿處所，因此，從鑽鑿處所滲透到地 盤中的量很多，但是，本發明藉由以上述的方式來形成流 體供給口，可以減少滲透到地盤中的鑽鏊用水量。此外， 只要與以往相同的鑽鑿用水的供給量即可讓鑽鏊屑排出去 而不會堆積，可順暢地進行鑽孔作業。藉此，可防止降低 鑽鑿屑的排出性能，並且可防止因鑽鑿用水的滲透所導致 -9- (6) 1333522 的地盤的鬆.動。 又，本發明的鑽鑿工具是上述的鑽鑿工 爲：上述流體供給口的開口是朝向上述工具本 行方向的後方。 這種發明的鑽螌工具，流體供給口的開口 工具本體的鑽鑿進行方向的後方，也就是，從 向的前方到後方，逐漸地從流路往外側方向傾 體供給口，因此，鑽鑿用水是從流體供給口朝 向的後方噴出，而得以抑制鑽鑿用水朝前方流 來，可更進一步地減少從鑽鑿處所滲透到地盤 水的水量，並且可令鑽鑿屑更順暢地往後方排 此外，本發明的鑽鑿工具是就上述的鑽鑿 了與前述流路分開而可獨立地供給鑽鑿用空 路，而且與該空氣流路相連通的用來噴出鑽鑿 氣供給口的開口是朝向鑽鑿進行方向的前方。 這種發明的鑽鑿工具，是設置了與流路分 地供給鑽鑿用空氣的空氣流路，所以可分別供 以及鑽鑿用空氣到工具本體’而且與該空氣流 用來噴出鑽鑿用空氣的空氣供給口的開口是朝 方向的前方，因此，鑽鑿用空氣是噴出到鑽鑿 鑿處所產生的鑽鑿屑會被該鑽鑿用空氣導入到 且被鑽鏊用水從鋼管與鑽孔桿之間的間隙沖走 是以，鑽鑿用空氣是形成將鑽鑿屑導入到鋼管 因此可抑制鑽鑿用水流到前方，並且可更順暢 具，其特徵 體的鑽鑿進 是朝向上述 鑽鑿進行方 斜地形成流 鑽鑿進行方 出。如此一 中的鑽鑿闬 出。 工具，設置 氣的空氣流 用空氣的空 開而可獨立 給鑽鑿用水 路相連通的 向鑽鑿進行 處所。在鑽 鋼管內，並 而被排出。 內的氣流， 地將鑽鑿屑 -10- (7) (7)1333522 排出。 . 又，本發明的鑽鑿工具’是備有：可在於軸線的周圍 旋轉驅動的鑽孔桿；和裝設在該鑽孔桿的鑽鑿進行方向的 前方的工具本體；和在插入著鑽孔桿的狀態下’對於該鑽 孔桿尙保有預定的間隙的圓筒狀的鋼管而構成的鑽鑿工 具，其特徵爲：在上述鋼管上是形成了裝設了用來吐出注 入劑的壓力閥之篩孔，上述壓力閥是設定成在鑽鑿用水 流通的壓力下’並不會打開’在注入劑的注入壓力下才會 打開。 這種發明的鑽鑿工具’是在鋼管上形成了蹄孔’在這 種篩孔上裝設了用來吐出注入劑的壓力閥’這種壓力閥的 開啓壓力是被設定成：在鑽鑿用水流通的壓力下’並不會 打開，在注入劑的注入壓力下才會打開，所以可抑制當進 行鑽鑿作業時的鑽鑿用水流出到地盤內。也就是說，如果 是未裝設壓力閥的話，鑽鑿用水會從篩孔流出而滲透到地 盤，因此會有導致地盤鬆動之虞，但是，如果有這種壓力 閥的話，可抑制鑽鑿用水的流出，可防止地盤鬆動。而 且，只有當進行注入劑的注入作業時的注入劑吐出壓力才 會令壓力閥開啓，所以可確實地吐出注入劑而令其滲透到 地盤中。藉此，可確實地獲得地盤的補強效果。 又，本發明的鑽鑿工具，是就上述的鑽鏊工具，其特 徵爲：上述壓力閥是具備：位於上述鋼管的內面側的薄膜 部。 這種發明的鑽鑿工具的壓力閥是具備：位於鋼管的內 -11 - (8) (8)1333522 面側的薄膜部’所以當進行鑽鑿作業時’可利用薄膜部來 抑制鑽鑿用水的流出’當進行注入劑的注入作業時，薄膜 部會變形而讓注入劑吐出去。此時’雖然是利用來自鋼管 的內側的壓力讓薄膜部朝外側變形’但是’薄膜部是位在 鋼管的內面側，所以薄膜部的變形並不會受到鑽鑿孔的孔 壁所妨礙，壓力閥還是可以打開。而且也不會讓堵塞在鋼 管與鑽鑿孔之間的土砂來妨礙到壓力閥的開啓。藉此，可 順暢地流出注入劑而可獲得良好的地盤補強效果。 又，本發明的鑽鑿工具，是就上述的鑽鑿工具，其特 徵爲：具備裝設了壓力閥的鋼管而構成的。 這種發明的鑽鑿工具是在例如：流體供給口是朝向工 具本體的鑽鑿進行方向的後方而開口於鋼管內部，且設置 了用來供給鑽鑿用空氣的空氣流路的鑽鑿工具，具備：裝 設了具有薄膜部的壓力閥的鋼管而構成的，因此，當進行 注入劑的注入作業時，可令注入劑確實地從壓力閥吐出。 藉此，可防止地盤的鬆動，而獲得補強效果。 又，本發明的鋼管先撐工法，是具有：在地盤中形成 鑽鑿孔並且插入鋼管的鑿孔作業；和將鋼管留置於地盤中 而抽出鑽孔桿以及工具本體之後，將注入劑注入以補強地 盤的注入作業之鋼管先撐工法，其特徵爲： 用來沖走鑽鑿作業時所產生的鑽鑿屑的鑽鑿用水是從 上述工具本體的流體供給口噴出到上述鋼管內部。又.，宜 另一個特徵爲：當進行鑽鑿作業時，裝設在上述鋼管上的 篩孔的壓力閥是關閉著，當進行注入劑的注入作業時，利 -12- (9) (9)1333522 用注入劑的.壓力來打開上述壓力閥。 這種發明的鋼管先撐工法’是利用從工具本體的流體 供給口噴出到鋼管內部的鑽鑿用水來沖走鑽鑿作業時所產 生的鑽鑿屑，所以可防止鑽鑿用水從鑽鑿處所滲透到地盤 中所導致的地盤鬆動，並且’不會讓鑽鑿肩堆積起來，可 順暢地進行鑽鑿作業。又，裝設在鋼管的篩孔的壓力閥， 當進行鑽鑿作業時是關閉著’所以可防止鑕鑿用水的流 出，當進行注入劑的注入作業時’利用注入劑的壓力才會 令壓力閥打開，所以可吐出注入劑’可防止地盤的鬆動而 確實地將地盤補強。 又，爲了解決上述課題，本發明提出以下的技術方 案。 本發明的鑽鑿工具，是備有：可在於軸線的周圍旋轉 驅動，在兩端部具有連結部的鑽孔桿；和裝設在該鑽孔桿 的鑽鑿進行方向的前方’在基端部具有被連結部的工具本 體；和在插入著上述鑽孔桿的狀態下’對於該鑽孔桿尙保 有預定的間隙的圓筒狀的套筒；和用來連結上述鑽孔桿， 在兩端部具有被連結部的構件（中間構件）而構成的鑽鑿 工具，其特徵爲： 在上述工具本體以及中間構件的整個外周面上，形成 有螺旋狀的排出溝’在上述鑽孔桿的局部或者整個外周面 上，設有螺旋葉片部。此外’所謂「中間構件」是使用於 鑽孔桿的連結工作的構件的總稱，具體而言’是指：後述 的中間套筒（工具本體構件除外）、穩定器等。 -13- (10) 1333522 這種發.明的鑽鑿工具是在於工具本體以及中間 整個外周面上，形成了螺旋狀的排出溝，在鑽孔桿 或者整個外周面上，設有螺旋葉片部，所以在套筒 向基端側排出的鑽鑿屑，會受到旋轉驅動中的排出 螺旋葉片部所攪拌，可抑制其堆積在套筒內。又， 會沿著旋轉驅動中的排出溝以及螺旋葉片而被沖 側，所以可順暢地排出。 藉由製作成這樣的可易於排出鑽鑿屑的結構， 鑽鑿用水的使用量，或者即使以空氣來取代鑽鑿用 可順暢地排出鑽鑿屑而不讓其堆積起來》藉此，不 制因鑽鑿用水所導致的地盤的鬆動，並且可順暢地 鑿作業。 又，本發明的鑽鑿工具，是就上述的鑽鑿工具 徵爲··在上述鑽孔桿與上述工具本體之間，裝設著 部具有連結部在後端部具有被連結部的穩定器（ 件），在該穩定器的局部或者整個外周面上，形成 狀的排出溝。 這種發明的鑽鑿工具，是在鑽孔桿與工具本體 裝設著在前端部形成連結部在後端部形成被連結部 器’因此，不僅可確保鑽鑿作業時的工具本體的直 並且在該穩定器的局部或者整個外周面上，形成了 的排出溝，所以利用該穩定器亦可獲得攪拌鑽鑿屑 鑽鑿屑朝基端側擠推送走的效果。如此一來，即使 穩定器也是可以順暢地將鑽鑿屑排出。 構件的 的局部 內被朝 溝以及 鑽鑿屑 到基端 可減少 水，也 僅可抑 進行鑽 ，其特 在前端 中間構 了螺旋 之間， 的穩定 進性， 螺旋狀 以及將 使用了 -14 - (11) (11)1333522 又’本·發明的鑽鑿工具，是就上述的鑽磐工具’其特 徵爲：當上述各連結部連結在上述各被連結部的狀態下’ 位在該被連結部的外側的上述連結部在軸線方向上的尺 寸，是被設定爲：上述套筒的內徑的1 .5倍以下β 這種發明的鑽鑿工具，各連結部與各被連結部互相連 結的狀態下，位在該被連結部的外側的連結部在軸線方向 上的尺寸，也就是，除掉被插入到被連結部的部分後的連 結部在軸線方向上的尺寸，是被設定爲：套筒的內徑的 1 .5倍以下，所以可抑制鑽鑿屑堆積在連結部。換言之’ 在未形成有排出溝、螺旋葉片的連結部的地方’原本鑽盤 屑就比較容易堆積而有降低排出效率之虞，但是’藉由將 連接部的尺寸設定在上述的範圍內，可抑制排出效率的降 低。藉此，可順暢地排出鑽鑿屑。 又，本發明的鑽鑿工具，是就上述的鑽繫工具’其特 徵爲：在穩定器的連結部形成有朝基端側逐漸地擴徑的傾 斜面，該傾斜面之相對於軸線的角度是4 5度以下。 這種發明的鑽鑿工具，形成在穩定器的連結部的傾斜 面之相對於軸線的角度是45度以下，所以可抑制這個傾 斜面對於排出鑽鑿屑所帶來的不良影響。也就是說’胃種 朝基端側逐漸地擴徑的傾斜面之相對於軸線的角度是4 5 度以上的話，鑽鑿屑朝向基端側流動時將會受到該傾斜面 的妨礙，而會有鑽鏊屑堆積在連結部之虞’但是’藉由將 該傾斜面的角度設定爲4 5度以下，可抑制鑽鑿屑堆積起 來。藉此，可抑制鑽鏊屑的排出效率的降低。 -15- (12) (12)1333522 又，本發明的鑽鑿工具，是就上述的鑽鑿工具，其特 徵爲：在上述工具本體上，形成了可沿著上述軸線來供給 鑽鑿用水的流路；從上述流路與上述排出溝的溝底面相連 通的流體供給口的開口是朝向上述工具本體的基端側。 這種發明的鑽鑿工具，從沿著軸線形成在工具本體的 內部的流路與排出溝的溝底面相連通的流體供給口的開口 是朝向工具本體的基端側，換言之，流體供給口是從流路 往溝底面而且是朝工具本體的基端側傾斜地形成，所以被 供給到流路而從流體供給口噴射出來的鑽鑿用水將會以朝 向工具本體的基端側的方式被噴射到排出溝。藉由將鑽鏊 用水朝這種方向噴射，可更順暢地將通過排出溝的鑽鑿屑 予以排出，而可提高排出效率。 又，爲了解決上述課題，本發明提出以下的技術方 案。 本發明的鑽鑿工具，是備有：可在於軸線的周園旋轉 驅動的鑽孔桿；和裝設在該鑽孔桿的鑽鑿進行方向的前方 的工具本體；和在插入著上述鑽孔桿的狀態下，對於該鑽 孔桿尙保有預定的間隙的圓筒狀的套筒而構成的鑽鏊工 具，其特徵爲： 上述工具本體的前端部被形成略圓錐形狀，從該前端 部往基端部的螺旋狀的排出溝是被形成在上述工具本體的 側面。 這種發明的鑽鑿工具，前端部被形成略圓錐形狀的工 具本體的側面，是形成了從該前端部往基端部的螺旋狀的 -16 ~ (13) (13)1333522 排出溝’所以因鑽鑿而產生的鑽鑿屑將會沿著略圓錐形狀 的前端部往基端側流動，且被引導到排出溝進而被導入到 鑽孔桿與套筒之間的間隙。換言之，工具本體是接受鑽孔 桿所傳來的驅動力而進行旋轉驅動，因此，螺旋狀的排出 ί冓@ f攪#鑽屑’並且利用螺旋狀的排出溝的側面將鑽 鏊屑往基端側推擠流動。藉此，可減少鑽鑿用水的使用 量’或者即使以空氣來取代鑽鑿用水，也可順暢地排出鑕 螌屑而不讓其堆積起來。藉此，不僅可抑制因鑽鑿用水所 導致的地盤的鬆動’並且可順暢地進行鑽鑿作業。 又’本發明的鑽鑿工具，是就上述的鑽鑿工具，其特 徵爲：藉由在上述工具本體的前端部形成缺口部，以在於 該缺口部之面向旋轉方向前方的切刃側面與前端面的交叉 部上’形成切刃部，並且上述切刃側面是與上述排出溝之 面向旋轉方向前方的溝側面形成連續，且對於上述前端部 的頂點部分以及上述切刃部實施了耐磨處理。 這種發明的鑽鑿工具，是在略圓錐形狀的工具本體的 前端部形成缺口部，在於該缺口部之面向旋轉方向前方的 切刃側面與前端面的交叉部上，形成切刃部，也就是說， 將缺□部之旋轉方向後方側的邊緣部分當作切刃部，並且 切刃側面是與排出溝之面向旋轉方向前方的溝側面形成連 續’所以即使因切刃部而產生了鑽鑿屑，鑽鑿屑也會被切 刃側面引導至排出溝。以這種方式，將切刃部形成在可將 鑽鑿屑引導至排出溝的這種位置關係上’因此，可順暢地 排出鑽鑿屑。此外，前端部的頂點部分以及切刃部都實施 -17 - (14) (14)1333522 了耐磨處理，所以可抑制頂點部分以及切刃部的磨損》例 如：這種耐磨處理的做法是：形成了包覆住前端部的頂點 部分以及切刃部之硬質厚塊，或者植設了超硬刃片。藉 此，可長時間維持住上述的這種排出溝與切刃部的位置關 係，即使鑕鑿距離很長的情況下，亦可防止鑽鑿屑的排出 效率的降低。 又’本發明的鑽鑿工具，是就上述的鑽鑿工具，其特 徵爲：在上述工具本體上，形成了可沿著上述軸線來供給 鑽鑿用水的流路；從上述流路與上述排出溝的溝底面相連 通的流體供給口的開口是朝向上述工具本體的基端側。 這種發明的鑽鑿工具，從沿著軸線形成在工具本體的 內部的流路與排出溝的溝底面相連通的流體供給口的開口 是朝向工具本體的基端側，換言之，流體供給口是從流路 往溝底面而且是朝工具本體的基端側傾斜地形成，所以被 供給到流路而從流體供給口噴射出來的鑽鑿用水將會以朝 向工具本體的基端側的方式被噴射到排出溝。藉由將鑽鏊 用水朝這種方向噴射，可更順暢地將通過排出溝的鑽鏊屑 予以排出，而可提高排出效率。 又’本發明的鑽鑿工具，是就上述的鑽鑿工具，其特 徵爲：被配置在上述工具本體的外周的環形鑽頭是裝設在 上述套筒的前端，上述環形鑽頭的前端部的內周面具有一 個傾斜面，該傾斜面是從後端側往前端側愈來愈接近外周 側’而設在該前端部的切刃部也形成有一個同樣傾斜的傾 斜面。 -18- (15) (15)1333522 這種發明的鑽鑿工具，環形鑽頭是在前端部設有切刃 部，前端部以及切刃部的內周面是形成：從後端側往前端 側愈來愈接近外周側的傾斜面，換言之’從沿著軸線的剖 面圖來觀察的話，互相面對的兩個傾斜面是形成「八字形 狀j ，所以鑕鑿屑會被該等傾斜面引導到環形鑽頭的內 側。藉此，可防止通過工具本體的排出溝的鑽鑿屑流到環 形鑽頭的外側，而可順暢地排出鑽鑿屑。 〔發明的效果〕 如上所述，根據本發明的鑽鑿工具，與工具本體的流 路相連通之流體供給口只形成在從鋼管內部開口的位置， 所以可防止鑽鑿用水從鑽鑿處所滲透到地盤中，既不會降 低鑽鑿屑的排出性能，又可防止因鑽鑿用水的滲透所導致 的地盤的鬆動。 又，流體供給口的開口是朝向工具本體的鑽鑿進行方 向的後方，可更進一步地抑制鑽鑿用水流到鑽鑿處，並且 可令鑽鑿屑更順暢地往後方排出。 此外，空氣供給口的開口是朝向鑽鑿進行方向的前 方，噴出的鑽鑿用空氣是形成將鑽鑿屑導入到鋼管內的氣 流，因此可抑制鑽鑿用水流到前方，並且可利用鑽鑿用空 氣和鑽鑿用水而更順暢地將鑽螌屑排出。 根據本發明的鑽鑿工具，可藉由設定：被安裝在篩孔 的用以吐出注入劑的壓力閥的開啓（開放時所需的）壓 力’來防止進行鑽鏊作業時的鑽鑿用水流出到地盤中，而 -19- (16) (16)1333522 在進行注入劑的注入作業時可確實地吐出注入劑。 又，因爲具有位在鋼管的內面側的薄膜部的壓力閥’ 所以當進行注入劑的注入作·業，薄膜部的變形不會受到鑽 孔壁、土砂等的妨礙，可確實地令壓力閥打開，而使其順 暢地吐出注入劑。 又，藉由具備了上述的空氣供給口以及壓力閥的鑽鑿 工具，在進行鑽鑿作業時可抑制鑽鑿用水滲透到地盤中’ 並且可從壓力閥確實地吐出注入劑。 又，根據本發明的鋼管先撐工法，鑽鑿用水是被噴出 到鋼管內部，可防止由鑽鑿用水所導致的地盤的鬆動，可 有效率地排出鑕鑿屑，順暢地進行鑽鑿作業。 又’因爲是利用壓力閥來防止鑽鏊用水的流出，所以 可防止地盤的鬆動，利用注入劑的壓力來開啓壓力閥，所 以可確實地吐出注入劑來補強地盤。 又，根據本發明的鑽鑿工具，因爲是設有螺旋狀的排 出溝以及螺旋葉片部，所以可獲得攪拌套筒內的鑽鑿屑並 且推往基端側的效果，即使減少鑽鑿用水的使用量亦可順 暢地排出鑽鑿屑，不僅可抑制由鑽鑿用水所導致的地盤的 鬆動，又可順暢地進行鑽鑿作業。 又’在被裝設在鑽孔桿與工具本體之間的穩定器身上 也形成了螺旋狀的排出溝，所以可獲得同樣的順暢地排出 鑽鑿屑的效果。 又，各連結部被連結於被連結部的狀態下，位於被連 結部的外側的連結部在軸線方向上的尺寸’是被設定爲： -20- (17) 1333522 套筒的內徑的〗.5倍以下， 部，可抑制排出效率的降低 又，形成在穩定器的連 角度是4 5度以下’所以可 屑所帶來的不良影響，可抑 又，流體供給口是形成 以被供給到流路而從流體供 以朝向工具本體的基端側的 鑽鑿用水朝這種方向噴射， 鑿屑予以排出，而可提高排 又，根據本發明的鑽鑿 是形成了螺旋狀的排出溝， 鑿屑又將鑽鑿屑往基端側推 少鑽鑿用水的使用量，也可 積起來降低排出性能，不僅 盤的鬆動，並且可順暢地進 又，頂點部分以及切刃 部的切刃側面與排出溝的面 成連續面，所以即使長時間 順暢地將鑽鑿屑引導到排出 又，流體供給口是形成 以從流體供給口噴射出來的 的基端側的方式被噴射出來 的鑽鑿屑予以排出，可提高 所以可抑制鑽鑿屑堆積在連結 〇 結部的傾斜面之相對於軸線的 抑制這個傾斜面對於排出鑽鑿 制鑽鑿屑的排出效率的降低。 朝工具本體的基端側開口，所 給口噴射出來的鑽鑿用水將會 方式被噴射到排出溝，藉由將 可更順暢地將通過排出溝的鑽 出效率。 工具，在工具本體的側面上， 所以可獲得既攪拌套筒內的鑽 擠流動的效果。藉此，即使減 順暢地排出鑽鑿屑而不讓其堆 可抑制因鑽鑿用水所導致的地 行鑽鑿作業。 部都實施了耐磨處理，且切刃 向旋轉方向前方的溝側面是形 使用後，依然可利用切刃側面 溝。 朝工具本體的基端側開口，所 鑽鑿用水將會以朝向工具本體 ，而可更順暢地將通過排出溝 排出效率。 -21 - (18) (18)1333522 此外，.在環形鑽頭的前端部以及切刃部的內周面’形 成傾斜面，因此可將鑽鑿屑引導到環形鑽頭的內側’而可 提高鑽鑿屑的排出效率。 【實施方式】 〔發明之實施形態〕 〔第一實施形態〕 茲佐以圖面第]圖至第4圖’說明本發明的實施形態 —如下。 第1圖是顯示本發明的第一實施形態的鑽鑿工具1 〇 的前端部分，第]圖（a )是將鑽鑿工具1 〇從軸線〇的前 端側觀察時的圖；第1圖（b )是鑽鑿工具10的局部剖面 的側面圖；第1圖（b )的剖面部分是第1圖（a )所示的 A - 0 — A ’剖面線的剖面圖。又，第1圖（a )所示的箭 頭的方向是鑽鑿時的旋轉方向T，第1圖（b )的左側是 鑽鑿工具1 0的前端側，前端方向就是鑽鑿進行方向的前 方。本實施形態中，鑽鑿工具I 〇是具備：位在最前端用 來鑽鏊地盤的工具本體11;和在前端裝設了工具本體11 可用來傳達驅動力的鑽孔桿1 2 ;和可供插入鑽孔桿1 2的 圓柱狀的鋼管13而構成的。 工具本體1 1是由：可安裝到鑽孔桿1 2上的本體構件 09;和安裝在本體構件〇9的前端部的兩個地方的鑽頭15 而構成的。本體構件0 9是以軸線〇爲中心的略呈柱狀的 構件，在其基端面1 4 a上穿設一個以軸線〇爲中心的用來 -22- (19) (19)1333522 安裝鑽孔桿*] 2的安裝孔1 6，在其前端面丨4 b則是穿設有 兩個可旋轉支承鑽頭丨5的支承孔]7、] 7，這兩個支承孔 ]7 ' 1 7的中心疋&於偏離軸線〇的位置。在安裝孔】6的 內周面1 6 a ’’的基端部附近，穿設有兩個可供插入與軸線 〇垂直相交的固定銷1 8的銷孔1 9，該銷孔]9的內周面 是開□於安裝孔]6內。在安裝孔]6的較銷孔1 9更前端 側的內周面1 6 a是形成母螺紋部2 〇，在安裝孔1 6的底面 1 6 b ’是形成了預定的深度的以軸線〇爲中心的流路2 ]。 在本體構件09的外周面上，形成了從前端面〗4往基 端側的排出溝2 2 ’流路2 1的流體供給口 2 4是開口於排 出溝2 2的溝底面2 3而讓流路2 1與排出溝2 2相連通。流 體供給口 24是設置成：從流路2丨到排出溝22而且是從 前端側朝基端側地對於軸線〇保持傾斜，而且是朝向鑽 鑿進行方向的後方（基端方向）開口於溝底面2 3。又， 如圖所示’當工具本體1 1插入在鋼管1 3內的狀態下，流 體供給口 2 4的開口是位在鋼管〗3的內部，換言之，流體 供給口 24的開口位置是被設定成：不會較之鋼管13更爲 前端的位置。此外，如第1圖（a )所示，排出溝22是設 在本體構件09上的兩個地方，且朝向互相相反的方向， 各排出溝22是各自形成有一個流體供給口 24。又，在溝 底面23的前端側，是形成了溝底面23朝前端側擴展開的 傾斜面2 5。 又，在本體構件09並未形成有排出溝22的外周面部 分，則是形成了 ：在前端側具有預定的外徑的滑接部 -23- (20) (20)1333522 26 ;和在滑接部26的基端側，其外徑較滑接部26更大的 大徑部27，並且將滑接部26與大徑部27之間的面向前 端側的傾斜面當作傳達面2 8。 又，鑽頭]5是具備：植設了鑽頭切刃片3 〇的頭部 3 1 ;和設在頭部3 1的基端側的軸部3 2，軸部3 2被插入 在支承ii ] 7內且被卡止在軸線方向上，藉此，鑽頭1 $就 以支承孔1 7的中心軸0 2爲中心，可轉動地被安裝在本 體搆件0 9上。頭部3 1由前端來觀察時，是略呈半圓形 狀’當進行鑽鑿時’則會變成如第1圖（a )所示的頭部 3】的互相的位置關係’而成爲擴徑狀態。又，如果將工 具本體1 ]朝向與旋轉方向T相反的方向旋轉的話，頭部 3 1就以中心軸02爲中心進行轉動，而兩個頭部31的圓 弧面3 1 a將會共同形成一個略圓形形狀般地，變成縮徑狀 ί?、’如此一來，就可以通過鋼管1 3的內部。 又’鑽孔桿1 2是一種管狀的桿’其中的流路4 〇是沿 者軸線Ο貫通，在其前端部設有一個可與工具本體η的 母螺紋部20螺合的公螺紋部4 ]，在公螺紋部41的基端 側’形成一個凹部4 2。令該公螺紋部4 1螺合到母螺紋部 2〇 ’將凹部42的位置對應到銷孔]9的位置，再將固定銷 1 8插入到銷孔1 9 ’即可互相地被卡合於軸線〇的方向 上’而以流路2 1與流路4 0互相連續的狀態將工具本體 Η安裝到鑽孔桿1 2上。 此外，在鋼管13的前端’利用焊接等的方式，安裝 著圓筒狀的套筒頭45，套筒頭45的內徑較之鋼管]3的 -24- (21) (21)1333522 內徑更小，其基端側的嵌合部4 6是可嵌插到鋼管1 3，嵌 合部4 6的基端面1 7是位在鋼管1 3的內側。如第1圖 (b )所示，在工具本體Η插入於鋼管1 3的狀態下，本 體構件09的滑接部26的外周面可滑動地接觸於套筒頭 4 5的內周面，本體構件09的傳達面28可抵接於基端面 4 7。又，流體供給口 24的開口位置是位在較之套筒頭4 5 更靠近基端側。又’在鋼管1 3與鑽孔桿12之間’設有預 定的尺寸的間隙4 8。 此外，如第2圖所示，在鋼管13上，是以預定的間 隔形成有用來吐出注入劑的篩孔5 0，在篩孔5 0上裝設了 壓力閥5 1。壓力閥5 1是一種橡膠製的閥，是被設定成： 當進行鑿孔作業時的鑽鏊用水流通在鋼管1 3的內側時的 壓力狀態下，並不會打開，只有當進行注入作業時的注入 劑的壓力的狀態下，才會打開，如第3圖所示，是具備 有：可嵌入到篩孔5 0的內周面的環狀壁部5 2 ;和用來封 閉由環狀壁部5 2的內周面所形成的流出口 5 3的其中一側 端部的薄膜部54。又，如第3圖所示，環狀壁部5 2的外 周面52a是形成錐面狀，其外徑是朝向薄膜部54側逐漸 地縮小，環狀壁部52的高度尺寸是設定成與鋼管13的厚 度近乎相同尺寸，薄膜部54的半徑尺寸是設定成較之環 狀壁部52的高度尺寸更小。 此外，薄膜部54的厚度t，是隨著開口壓力的設定而 不同，可從〇.2〜0.6mm的範圍內做適當的選定。又，因 應於使用狀況，亦可在薄膜部54形成十字型裂縫55或者 -25- (22) 1333522 在中心部形成針孔’藉以調整注入劑的吐出量。並且是以 令薄I吴部5 4 {ι/_於鋼管1 3的內側的方式，從鋼管1 3的外 側嵌入該壓力閥5 1而予以安裝。 當利用上述結構的鑽鑿工具1 0來進行鑽孔作業時， 鑽孔桿1 2的基端側是連接到鑿孔機（未圖示），除了被 施加：軸線0的外周方向的旋轉力 '軸線〇的方向的推 進力以及因應於必要之打擊力等等的驅動力之外，同時也 將鑽鑿用水以高壓狀態供給到流路40。這種驅動力是經 由鑽孔桿1 2而傳達到工具本體]1，利用鑽頭1 5鑽鑿地 盤而一面形成鑽鑿孔，一面從傳達面2 8將推進力傳達到 基端面4 7以使得鋼管1 3被插入到鑽鑿孔。又，鑽鑿用水 是從流路4〇被供給到流路21而從流體供給口 24噴射到 排出溝2 2。鑽鑿工作面所產生而流進到排出溝2 2內的鑽 鑿屑’受到噴射出來的鑽鑿用水的作用而更進一步地被沖 到基端側，通過間隙4 8而被排出到鑽鑿孔的外部。 此時，因爲篩孔5 0是裝設了壓力閥5 1，所以可抑制 鑽鑿用水從篩孔5 0吐出。藉由這種鑽孔作業，鑽孔桿！ 2 以及鋼管]3被依序連接上去，而形成預定的深度的鑽鑿 孔。在結束鑽孔作業之後，將鑽頭1 5變成縮徑狀態而抽 出工具本體]1以及鑽孔桿12，而變成只將鋼管13埋設 於地盤內的狀態。 的端向 3 前朝 1向其 管朝使 鋼面而 從 一 破 浦，打 石水側 4 送內5 壓的部 用 3 膜 利1薄 ’ 管將 中鋼力 業在壓 作是的 入劑劑 注入入 在注注 ， 的用 來入利 下注面 接側 I 端動 基流 -26- (23) (23)1333522 外側變形，並且讓注入劑從壓力閥5 1的流出口 5 3吐出到 地盤。此外，如果是在薄膜部5 4上形成十字型裂縫5 5或 者針孔的話，十字型裂縫5 5、或者針孔將會變形而變成 擴大形狀的十字型裂縫5 5 '或者針孔。如此一來，注入 劑將會從流出口 5 3吐出來而滲透到地盤：使得地盤受到 補強。 如上所述，形成於鑽鑿工具丨〇的本體構件〇 9上的流 體供給口 24是被形成爲：該流體供給口 24的開口位置是 在鋼管1 3的內部較之套筒頭45更位於基端側的位置，且 朝向基端方向=開口於溝底面2 3，所以可將鑽鑿周水噴 射成朝向基端側導入到間隙48。如此一來，能夠抑制鑽 鑿用水朝鋼管1 3的前端側流動，所以可抑制鑽鑿用水滲 透到地盤內，可防止因鑽鑿用水所導致的地盤鬆動等等的 不良影響。再者，不必減低鑽鑿用水的使用量，所以鑽鑿 屑的排出性能不會降低，可順暢地進行鑽孔作業。又，如 第5圖所示般地，以預定的角度朝向上方進行鑽孔的時 候，鑽鑿用水可較容易朝基端側流動，所以可更爲抑制鑽 鑿用水朝鋼管1 3的前端側流出。 又，因爲裝設有壓力閥5 1而可以抑制鑽鑿用水從篩 孔5 0吐出，因此得以防止鑽鑿用水所導致的地盤的鬆動 等的不良影響。又，壓力閥5 1是被設定成：根據注入劑 的壓力才可打開，因此可確實吐出注入劑。例如：間隙 4 8的基端側是朝鑕鑿孔的外側開放，所以用來排出鑽鑿 屑的鑽鑿用水加諸於壓力閥51的壓力是只有大氣壓力的 -27- (24) (24)1333522 程度，而注入劑的注入壓力則設定爲：1 Ο χ 1 Ο 3〜4 Ο χ 1 〇3Pa的範圍。又，打開的時候會朝向外側變形的薄膜部 5 4是形成上述的形狀，並且是位於鋼管】3的內側，因此 薄膜部5 4並不會變形到達鋼管〗3的外側，但是卻可利用 注入劑的壓力令其確實地變形。換言之，鑽鑿孔的孔壁、 堵塞在孔壁與鋼管]3之間的土砂並不會成爲妨礙薄膜部 5 4進行變形時障礙。如此一來，可以規定的吐出量來吐 出注入劑，而得以確實地補強地盤。 其次，說明第4圖所示的本發明的第2實施形態的鑽 鑿工具10 A。又’與第]實施形態的鑽鑿工具]〇同一搆 造的部分都標示同一符號，並且省略其說明。這個鑽鑿工 具]Ο A ’是在流路4 〇以及流路2 1中插入了配管6 0，並 且形成了：從流路2 1朝向傾斜面2 5開口的空氣供給口 6 ];和從流路2 1朝向溝底面2 3的基端側開口的流體供給 口 62。在配管60的前端部分，設置了：可將流路2 1內 予以區隔成流體力學觀點上的前端側和基端側之密封部 63 ’將配管60的內部當成空氣流路64 ’將配管60與流 路4〇以及流路2 1之間的間隙當成鑽鑿用水流路65。 又，空氣供給口 6 1是連通到被密封部6 3所區隔的流路 2 I內的前端側，流體供給口 62是連通到流路2丨內的基 端側。 藉由适種配管60 ’從空氣流路64被供給到流路2 i 內的則麵側的空氣將會從空氣供給口 6 ]噴出，從鑽鑿用 水流路65被供給到流路2】內的基端側的鑽鑿用水將會從 -28- (25) (25)1333522 流體供給口 6 2噴出。在鑽鑿處所產生的鑽鑿屑將會被朝 向鑽鑿處噴出的鑽鑿用空氣導入到排出溝22而進入到鋼 管]3的內側，然後被鑽鑿用水在間隙4 8內予以沖流而排 出’。換言之，藉由噴射了鑽鑿用空氣可使得鑽鑿屑流動而 不會囤積在鑽鑿處所，並且藉由進入到鋼管1 3的內側的 鑽鑿屑的氣流’可以防止鑽鏊用水朝前方流動。如此一 來’可防止鑽鑿用水從鑽鑿處所滲透到地盤內而造成不良 影響，並且可防止降低鑽鑿屑的排出性能，所以可順暢地 進行鑽孔作業。 此外，本實施形態中’流體供給口 2 4、6 2雖然是朝 向基端方向開口’但是’只要是讓流體供給口 2 4、6 2的 位置形成在：可讓從流體供給口 2 4 ' 6 2噴出的鑽鑿用水 不至於流到鑽鑿處所的位置的話，即使不是朝向基端方向 開口亦可。又，亦可藉由不具有擴縮直徑功能的鑽頭與環 形鑽頭之組合，來構成工具本體。又，本發明並不必限定 爲從傳達面2 8將推進力傳達到基端面4 7而使得鋼管】3 被插入到鑽鑿孔的這種結構的鑽鑿工具，亦可將本發明適 用在將推進力傳達到鋼管13的基端部而使得鋼管13被插 入到鑽鑿孔的這種結構的鑽鑿工具。 〔第二實施形態〕 茲佐以第6圖至第11圖，說明本發明的第二實施形 孽 〇 第6圖是顯示本發明的第一實施形態的鑽鑿工具j 〇 -29- (26) (26)1333522 的整體結構，第7圖是顯示鑽鑿工具1 〇的前端部分。 又’第7圖（a )是從軸線〇的前端側來觀察鑽鑿工具！ 〇 時的圖’箭頭的方向是顯示出鑽鑿時的旋轉方向T ;第7 圖（b )是鑽鑿工具]〇的局部剖面的側面圖，左側是當作 鑽鑿工具1 0的前端側，前端方向是被視爲鑽鑿進行方向 的前方。鑽鑿工具]〇是具備：位在最前端的用來鑽鏊地 盤的螺旋鑽頭（工具本體）1 1 ;和將螺旋鑕頭]1安裝在 前端之用來傳遞驅動力的鑽孔桿]2 ;和可讓鑽孔桿1 2插 入的圓筒狀的鋼管（套筒）]3 ;和用來連結複數的鑽孔桿 1 2的中間套筒（中間構件）]4而構成的。 螺旋鑽頭U是前端部1 5被形成略圓錐形狀的柱狀構 件，從該前端部1 5到基端側的整個外周面，都是以左螺 旋來形成螺線狀的排出溝1 6，換言之，是以從前端側到 基端側都是朝向與旋轉方向T相反的方向來扭轉的螺旋形 狀’在於柱狀構件的圓周方向上，等間隔地形成複數條 (圖中是顯示出三條）。排出溝1 6是具有：中央部份有 些突出的溝底面1 6a、和朝螺旋鑽頭1 1的直徑方向延伸 且互相面對的溝側面1 6b之斷面呈门字形狀的溝，而且是 從前端部〗5的圓錐面15a起迄螺旋鑽頭]1的基端面11a 爲止，都是形成連續的。又，排出溝16是被形成：前導 角是45°〜75°的範圍，溝深是5mm以上。 前端部1 5的數個地方（圖中是顯示三個地方）是形 成V字形狀的缺口部1 7，將缺口部1 7之朝向旋轉方向T 的前方的側面當作切刃側面1 7 a，將含有由切刃側面1 7 a -30- (27) (27)1333522 與圓錐面]5 a所形成的稜線的部分當作切刃部1 8。如第8 圖的立體圖所示般地，切刃側面1 7 a是隔著稜線]9而與 排出溝1 6之朝向旋轉方向T的前方的溝側面]6 b保持連 續，缺口部】7的另一方的側面1 7 b則是隔著稜線2 0而與 溝底面1 6 a保持連續地形成該缺口部1 7。並且將包覆住 前端部1 5的頂點部2 1與切刃部]8的一定範圍（圖中以 細點標示的範圍）形成爲用來進行耐磨處理的硬化材包覆 部。 又’在螺旋鑽頭]1之未形成有排出溝1 6的外周部 分，藉由形成於兩個部位的階部，從基端側起區隔成：第 一·外周部22、和弟一外周部23、和第三外周部24之不同 外徑的三個外周部，前端側的外周部的外徑形成較小。 又’在第一外周部2 2與第二外周部2 3之間，形成朝向前 端側的傾斜面2 5 ’在第二外周部2 3與第三外周部2 4之 間，形成朝向前端側的傾斜面26。又，在第三外周部 2 4，形成朝直徑方向突出的凸條部2 7。 又’在於基端面1 1 a是開設有一個以軸線〇作爲中心 之用來裝設鑽孔桿1 2的連結孔（被連結部）3 0，在連結 孔30的內周面30a的基端部附近，是有一個與軸線〇垂 直相交之用來插入固定銷的銷孔32，該銷孔32的側面的 一部分是被形成開□於連結孔30，在於較銷孔32更爲前 端側的內周面30a，是形成有母螺紋部33，在連結孔 的底面30b是形成了具有預定的深度之以軸線〇作爲中 心的流路3 4。而且與流路3 4相連通的流體供給口 3 3 6 -31 - (28) (28)1333522 是開口於溝底面1 6 a。流體供給口 3 5是從流路3 4朝向排 出溝]6以由前端側往基端側的方式對於軸線0傾斜，且 是朝向鑽鑿進行方向的後方（基端方向）開口於溝底面 1 6 a，流體供給口 3 6是朝鑽鑿進行方向的前方（前端方 向）開口於溝底面1 6a。 鑽孔桿]2是具有沿著軸線0貫通著流路4 0的管狀 桿，在於鋼管1 3與鑽孔桿1 2之間，具有預定大小的間 隙。在鑽孔桿]2的兩端部是形成具有公螺紋部4 I的連結 部42，在整個外周側面是除了連結部42之外，也就是 說’在外周側面的一部分是形成了螺旋葉片部4 3。螺旋 葉片部43是朝與排出溝16相同的方向形成螺旋狀，導角 被設定在4 5 °〜7 5 °的範圍，螺旋葉片部4 3的高度，也就 是直徑方向上的尺寸被設定爲5 m m以上。 又’在連結部42是從端部起依序地形成了：可與公 螺紋部3 3螺合的母螺紋部4 1 ;以軸線〇爲中心來迴旋延 仲的凹部；連結時位在連結孔3 〇的外側的被握持部44。 凹部是形成在：連結時與銷孔3 2相對應的位置，是用來 與插入於銷孔3 2的固定銷在於軸線〇方向上互相卡合的 部分’被握持部44則是當進行鑽孔桿1 2與螺旋鑽頭j】 的連結作業時’受到握持工具所握持的部分。又，是以將 連結部4 2連結到連結孔3 〇的狀態下，剛好位於連結孔 32的外側的被握持部44等的連結部42的軸線0方向上 的尺寸L1是：鋼管13的內徑〇的15倍以下的方式，來 形成連結部4 2。 -32- (29) 1333522 又，在中間套筒1 4是形成了在兩端部具有母螺 4 5的連結孔（被連結部）4 6，連結孔4 6則是被形成 線〇貫通過其中心。又，中間套筒1 4的整個外周面 是形成有朝向與螺旋鑽頭1 1的排出溝1 6相同方向扭 螺旋狀的排出溝4 7。又，在於將鑽孔桿I 2的連結ί 連結於中間套筒1 4的連結孔4 6的狀態下，剛好位在 孔4 6的外側的連結部4 2的軸線0方向上的尺寸是 定爲：鋼管1 3的內徑D的5倍以下。又，排出溝 被形成：導角是45。〜75。的範圍，溝深爲5mm以上。 在鋼管]3的前端是利用焊接等的方式，安裝有 圓筒狀的套筒頭4 8。套筒頭4 8是如第7圖所示般地 有：較鋼管1 3更位在前端側的前端部4 9 ;和相對於 端部4 9 ’內外徑都更爲縮小一些的基端部5 0，在基 5 0的基端緣是形成有一個朝基端側逐漸擴大直徑之 斜的基端面5 Oa。基端部5 0的外周面可嵌入到鋼管 內周面是被形成可滑動接觸於螺旋鑽頭11的第二外 2 3，前端部4 9的內外徑是被形成約略等於鋼管1 3的 徑。又，在前端部49的內周面的軸線Ο方向上的略 處，是形成有一個在這個內周面上朝向軸線Ο的外 旋繞的環狀溝5 ]，環狀溝5〗從沿著軸線〇的斷面圖 察時，是在於軸線0的方向上具有預定的尺寸，且 成Π字狀。 又’環形鑽頭5 2是被裝設在套筒頭4 8的前端， 對於套筒頭4 8進行自由旋轉，且可在軸線〇的方向 紋部 讓軸 上’ 轉的 β 42 連結 被設 Π是 -個 ，具 該前 端部 呈傾 13, 周部 內外 中間 周圍 來觀 是形 可相 上的 -33- (30) 1333522 預定的範圍內進行滑動。環形鑽頭5 2是具有：較之套 頭4 8更位在前端側的前端部5 3 ;和可滑動接觸於套筒 4 8的前端部4 9的內周面的基端部5 4。又，在基端部 的基端緣之中’位於較之套筒頭4 8的基端面5 0的內周 更內側的基端緣上’是形成有一個朝基端側逐漸擴大直 之呈傾斜的基端面5 4 a。環形鑽頭5 2的內周面是可與 旋鑽頭1 1的第三外周部2 4滑動接觸，且形成有可收容 條部2 7的凹條部5 5。又’前端部5 3的前端面是形成 前端側逐漸擴徑的錐面狀的傾斜面5 3 a ,換言之，在沿 軸線0的斷面上互相相向的兩個傾斜面5 3 a彼此是被形 「八字狀」。 又’在環形鑽頭5 2的基端部5 4的外周面上，是形 有一個以軸線0爲中心之環繞著該軸線〇的外周圍的 狀溝5 6 ’環狀溝5 6從沿著軸線0的斷面圖來觀察時， 形成Π字狀，在於藉由將環形鑽頭5 2嵌插到套筒頭4 8 前端部內周，而使環形鑽頭52的環狀溝56與套筒頭 的環狀溝5 1互相對準所圍成的環狀孔中，介裝著一個 相對於軸線0朝直徑方向進行彈性變形的卡止構件5 7 卡止構件57是具有可嵌合到環狀溝56的斷面形狀的C 卡止環’因爲卡止構件57的軸線0上的尺寸被設定成 環狀溝5 ]的軸線〇上的尺寸更短，所以卡止構件5 7 在環狀溝51的軸線〇的方向上滑動。藉由讓卡止構件 與環狀溝51以及環狀溝56所構成的環狀孔的這種卡合 式’可將環形鑽頭5 2裝設成可相對於套管頂4 8自由旋 筒 頭 54 面 徑 螺 凸 朝 著 成 成 環 是 的 48 可 〇 型 較 可 5 7 方 轉 -34 - (31) (31)1333522 且能夠滑動。 又，以朝向環形鑽頭5 2的前端側突出般地被植設於 複數個地方（圖中是顯示三個地方）的鑌削刀頭5 8是被 當成切刃部，鑽削刀頭5 8的形狀也是具有朝內側傾斜的 傾斜面5 8 a的形狀。又，在植設有鑽削刀頭5 8的圓周方 向上的位置，當螺旋鑽頭Π與環形鑽頭5 2在圓周方向上 卡合的狀態下，螺旋鑽頭1】的切刃部1 8是被設定成較之 鑽削刀頭5 8更位於前方。 又’爲了將來自於驅動裝置的驅動力量傳達到鑽孔桿 ]2以及鋼管]3，在鑽孔桿I 2的基端裝設有一調整桿 6 0，在鋼管1 3的基端裝設有一轉接頭6 1。調整桿6 0是 具有：在外周側面上形成了螺旋狀的排出溝6 2的桿本體 部6 3 ;和從桿本體部6 3朝基端側延伸的軸部64，在桿本 體部6 3的前端面是形成有以軸線〇爲中心且具有母螺紋 部65的連結孔（被連結部）66 ’在軸部64的前端是形成 有一個公螺紋部6 7。轉接頭6 1是具有：具有與鋼管} 3 略同一外徑的圓筒部6 8 ;和設在圓筒部6 8的前端側之可 嵌入到鋼管1 3的內周面的連結部6 9 ;和設在圓筒部6 8 的基端側之可供調整桿60的軸部64插入的孔部70。 又，在圓筒部68形成有一個可將鋼管]3內流動過來的_ 削排出到外部的排出口 72。 將鑽孔桿1 2以及鋼.管1 3連結到驅動裝置的方式是先 讓調整桿6 0的連結孔6 6連結到鑽孔桿1 2的連結部4 2， 再將轉接頭6 1的連結部6 9嵌入到鋼管]3而使得鋼管1 3 -35- (32) (32)1333522 的基端面與圓筒部6 8的前端面互相抵接，並且將調整桿 6 〇的軸部6 4插入到轉接頭6 1的孔部7 〇。然後’將連桿 橇件7 3插入到較之轉接頭6 1更爲突出到基端側的軸部 6 4，使得連桿構件7 3與轉接頭6 1的基部7 1互相抵接’ 將套筒7 4的一端螺合到軸部6 4的公螺紋部6 7以使得套 筒74抵接在軸部64的公螺紋部67，並將驅動裝置的軸 椁75連結到套筒74的另一端。 利用上述的這種結構的鑽鑿工具1 〇進行鑽鑿作業 時，軸線〇外圍的旋轉力量、軸線〇方向的推進力量以 及因應必要而施加進去的打擊力量等等的驅動力量將會從 軸桿7 5經由套筒74傳達到轉接頭6 1和調整桿6 0，而分 別傳達到鋼管1 3和鑽孔桿1 2。又，在於從鑽孔桿1 2傳 達到螺旋鑽頭1 1的驅動力量之中，軸線0外圍的旋轉力 量是藉由凸條部2 7與凹條部5 5的卡合而被傳達到環形鑽 頭5 2，軸線〇方向的推進力量以及打擊力量是藉由傾斜 面26與基端面54a的互相抵接而被傳達到環形鑽頭52。 驅動力量是以這種方式來傳達，並且利用螺旋鑽頭1 1的 切刃部1 8和環形鑽頭5 2的鑽削刀頭5 8來鑽繫切削地 盤。此外’從鑽孔桿】2的流路4 0供給到螺旋鑽頭I 1的 流路3 4的鑽鏊用水則是從流體供給口 3 5、3 6噴出。因爲 鑽鑿切削地盤所產生的鑽鑿屑則在鋼管]3的0 $彳主基端 側流動，而從轉接頭6 ]的排出口 72排出。 在這種鑕鑿作業中，可利用被旋轉驅動的螺旋鑽頭 1 ]的排出溝1 6 '中間套筒1 4的排出溝4 7、鑽孔桿！ 2的 -36- (33) (33)1333522 螺旋葉片部43以及調整桿60的排出溝62將流動在鋼管 ]3的內部中的鑽鑿屑加以攪拌，並且可發揮將其朝向基 端側推擠流動的作用’所以能夠防止鋼管1 3的內部的鑽 鑿屑堆積起來，而可順暢地將鑽鑿屑排出。藉此，可減少 鑽鑿用水的使用量’或者即使以空氣來取代鑽鑿用水亦可 順暢地進行鑽鑿作業，並且可抑制因爲鑽鑿用水所導致的 地盤的鬆動。 又’在於將鑽孔桿1 2連結於螺旋鑽頭U的狀態下， 位於連結孔3 0的外側的連結部4 2的軸線〇方向上的尺 寸L ]被設定爲鋼管1 3的內徑D的1 .5倍以下，所以能夠 抑制鑽鑿屑的排出效率的降低。換言之，因爲在於連結部 4 2並未設有螺旋葉片部4 3，因此雖然無法獲得攪拌鑽鑿 屑的效果，但是卻因爲將L1設定爲鋼管13的內徑D的 1 . 5倍以下，所以能夠抑制鑽鑿屑堆積於連結部42，而可 順暢地排出鑽鑿屑。 又’流體供給口 3 5被設置成朝基端方向傾斜地開口 於溝底面1 6 a，因此從流體供給口 3 5噴出的鑽鑿用水是 被朝向基端方向噴出，可獲得將鑽鑿屑往基端側推擠衝流 的效果。因爲可抑制朝鑽鑿部位噴出的鑽鑿用水的量，所 以能夠抑制鑽鑿用水帶給地盤的不良影響。 其次，佐以第9圖來說明本發明的第二實施形態的鑽 鑿工具10A。鑽鑿工具10A與第一實施形態的鑽鏊工具 ]〇的不同點是在於：在螺旋鑽頭]]與鑽孔桿]2之間裝 設了穩定器8 0，並且軸線〇方向上的驅動力量是從螺旋 -37- (34) (34)1333522 鑽頭1 1傳達到鋼管]3。又，與鑽鑿工具1 0相同的結構 的部分則標示同一圖號，並且省略其詳細的說明。 穩定部8 0具有：具備可滑動接觸於鋼管1 3內面的外 徑的本體部8 ];和被設在本體部8 1的前端側的連結部 8 2，並且沿著軸線〇形成流路8 3。又，在於連結部8 2的 前端部分係形成有可與螺旋鑽頭1 1的母螺紋部3 3螺合的 公螺紋部8 4 ’在於基端側係形成有朝基端側不斷擴徑的 曲面狀的傾斜面8 5，而傾斜面8 5的切線相對於軸線〇的 角度Θ是設定成4 5 °以下。又，在本體部8〗的外周面是 形成有：朝向與螺旋鑽頭1 1的排出溝1 6相同的方向扭轉 的螺旋狀的排出溝8 6，在於基端面8 7係穿設了一個以軸 線0爲中心’且具有母螺紋部8 8的連結孔（被連結部） 8 9。又’排出溝8 6是被形成爲：導角是4 5。〜7 5。的範 圍，溝深是5 in m以上。 又’在於將穩定器8 0連結於螺旋鑽頭η的狀態下， 也就是’是以將母螺紋部3 3與公螺紋部8 4互相螺合讓連 結部8 2連結於連結孔3 0的狀態下，位於連結孔3 〇的外 部的連結部8 2的軸線〇方向上的尺寸L 2馬鋼管〗3的內 徑D的1 5倍以下的設定方式，來形成連結部8 2。又， 將鑽孔桿1 2的連結部4 2連結於穩定器8 0的連結孔8 9的 狀態下，位於連結孔8 9的外部的連結部42的軸線〇方 向上的尺寸L1也是被設定爲鋼管13的內徑〇的1.5倍以 下。 又，鑽鑿工具]Ο Α的結構是讓螺旋鑽頭]1的傾斜面 -38- (35) 1333522 2 5與套筒頭4 8的基端面5 〇 & (請參考第7圖）互 在—起’軸線〇方向的驅動力量是從傾斜面25傳 Χ晶面5 〇 3 ’鋼管1 3被插入到鑽鑿孔。藉由這種方 違驅動力量’在於鑽鑿工具]〇 a的基端側不必裝 ㊣6 ] '調整桿6 0等，就可讓鑽孔桿]2與驅動裝 ^ 7 5相連結。又，藉由以這種方式在於鑽鑿工具 則端側傳達了宛如牽引鋼管〗3的驅動力量的情況 了確保鑽靈作業的直進性而裝設了穩定器8 0。 在於；锺鑽鑿工具]〇A中，是在於穩定器80 旋狀的排出瀋8 6 ’所以可利用排出溝8 6來攪拌鑽 並且獲得將其推往基端側的效果，可順暢地將鑽丨 出。又’在於連結狀態下，位於連結孔3 0的外側 部82的軸線0方向上的尺寸L2被設定爲鋼管13 D的].5倍以下’所以在連結部8 2即使無法獲得 盤屑或者將鑽鑿屑往基端側推擠的效果，亦可抑制 的排出效率的降低。此外，因爲是將傾斜面8 5相 線〇的角度Θ設定在4 5。以下，所以可抑制因傾系 阻礙了鑕鑿肩的流動所導致的排出效率的降低。因 使採用裝設了穩定器80的鑽鑿工具i〇A，鑽鑿屑 堆積在鋼管1 3的內部，而得以順暢地進行鑽鑿作業 其次，說明工具本體的第一變形例之擴孔鑽頭 及第二變形例的擴孔鑽頭90a。又，與上述實施形 的結構的部分均標示同一圖號，並且省略其詳細的震 如第1 〇圖所示，擴孔鑽頭9 0是具有擴縮直徑 相抵接 達到基 式來傳 設轉接 置的軸 ]Ο A的 下，爲 形成螺 鑿屑， 屑排 的連結 的內徑 攪拌鑽 鑽鑿屑 對於軸 斗面8 5 此，即 也不會 〇 90以 態相同 兌明。 功能的 -39- (36) (36)1333522 鑿孔鑽頭，是具備了：可裝設在鑽孔桿].2上的柱狀構件 部9 ];和裝設在柱狀構件部91的前端的兩個地方的鑽頭 9 2而構成的。柱狀構件部91是以軸線0爲中心的略呈柱 狀的構件’在於基端面9 ] a係穿設有一個以軸線〇爲中心 之用來裝設鑽孔桿1 2的連結孔93，在於前端面9 1 b上， 係以從軸線0偏移開的兩個位置爲中心，穿設有兩個可 轉動地支承鑽頭92的支承孔94。在連結孔93的內周面 93a係形成有母螺紋部95，在連結孔93的底面93b是形 成有以軸線0爲中心之預定的深度的流路9 6。 在柱狀構件部9 1的外周’是以左向螺紋方式形成有 從前端面9 1 b朝往基端側的螺旋狀的排出溝97，且形成 有與流路96相連通之開口於排出溝97的溝底面97a的流 體供給口 9 8、9 9。流體供給口 9 8是被設成從流路2 1往 排出溝9 7且從前端側朝基端側，相對於軸線〇呈傾斜， 並且朝向基端方向，開口於溝底面9 7 a，流體供給口 9 9 則是朝向前端方向，開口於溝底面97a。又，在於柱狀構 件部9 1之並未形成有排出溝2 2的外周部分，係形成了朝 向前端側的傾斜面1 00。 又，鑽頭9 2係具備：被植設了數個鑽削刀頭】〇丨的 頭部1 02、和朝向頭部1 02的基端側的軸部1 〇3，軸部 1 0 3被插入到支承孔9 4而被卡止於軸線方向，藉此，可 將柱狀構件部9 1裝設成能夠以支承孔94的中心軸02爲 中心自由地轉動。鑽削刀頭1 0 1是在於略圓錐形狀的前端 部形成了傾斜面的釘爪狀的切刃，被植設在頭部1 02的前 -40 - (37) (37)1333522 端面上，且將由傾斜面所形成的前端稜線部呈放射狀地延 伸。頭部1 0 2由前端來觀察時’係呈略半圓形狀，當進行 鑽鑿時，係如第1 0圖（a )所示般地，變成頭部】〇 2彼此 交替的位置關係而成爲擴孔狀態。又，只要將擴孔鑽頭 9〇朝向與旋轉方向T的相反方向旋轉的話，就會以中心 軸 〇 2爲中心進行轉動’藉此，可利用彼此交替的頭部 1 〇2的圓弧面來形成略圓形形狀的縮徑狀態，而得以通過 鋼管1 3。 又，如第]]圖所示’擴孔鑽頭9 0 a係與擴孔鑽頭9 0 同樣地具有擴/縮徑的功能，鑽頭9 2 a的頭部1 0 2 a是與擴 孔鑽頭9 0的頭部1 0 2的形狀不同》又，針對於與擴孔鑽 頭9 0共通的結構部份’均標示以同一圖號，並且省略其 詳細說明。在頭部1 02a植設了數個具有朝前端方向以及 旋轉方向T突出形成V字狀的切刃的鑽削刀頭1 0 4，在各 鑽削刀頭1 04之間，形成了溝部1 05。 第一變形例的結構，是在鋼管1 3的前端裝設有套筒 頭4 8 a，藉由套筒頭4 8 a的基端面與擴孔鑽頭9 0的傾斜 面1 〇〇的互相抵接，將軸線0方向上的驅動力量從擴孔 鑽頭9 0傳達到鋼管1 3。藉由套筒頭4 8 a的基端面與擴孔 鑽頭9 0 a的傾斜面1 0 0的互相抵接，將軸線Ο方向上的驅 動力量從擴孔鑽頭90a傳達到鋼管1 3。 此外，第二變形例（第1 1圖）是採用了所謂「切削 型擴孔鑽頭」的實施例。鑽鑿工具，一般雖然都是利用旋 轉和打擊來進行鑽孔，但是》對於黏土層之類的非常軟弱 -41 - (38) (38)1333522 的地盤的地層，以加強了旋轉的切削方式來進行鑽孔，其 效率將會較之以打擊方式來進行鑽孔時的效率更好，因此 這種「切削型擴孔鑽頭」更可發揮效果。 在於這種具有擴/縮徑功能的擴孔鑽頭90、90a的柱 狀構件部9 1的外周，係形成了螺旋狀的排出溝9 7，所以 可利用排出溝9 7來攪拌鑽鑿屑，並且可獲得將其往基端 側推擠流動的效果，因此可順暢地排出鑽鑿屑。 此外，在本實施形態中，螺旋鑽頭1 1的排出溝]6、 鑽孔桿1 2的螺旋葉片部4 3、中間套筒】4的排出溝4 7以 及穩定器80的排出溝86的導角雖然是分別被髟成不同的 角度’但是如果能夠將這些導角都形成大致同一角度的 話’將會更好。又，亦可對於螺旋鑽頭1 1的切刃部以及 植設於頂點部2 ]的鑽削刀頭實施耐磨處理。此外，亦可 採用由其他的材質所作成的套筒來取代鋼管。 【圖式簡單說明】 第]圖是本發明的實施態樣一的第一實施形態的鑽鑿 工具的前端部分，（a )是鑽鑿工具的前端視圖；（b )是 部份剖面的側面圖。 第2圖是裝設了篩孔的附近的鋼管的剖面圖。 第3圖（a)是壓力閥的剖面圖；（b)是壓力閥的正 面圖。 第4圖是本發明的實施態樣一的第二實施形態的鑽鑿 工具的整體結構圖。 -42- (39) 1333522 第5圖是鋼管先撐工法的說明圖。 第6圖本發明的實施態樣二的第一實施形態的 具的整體結構圖。 第7圖是顯示鑽鑿工具的前端部分，（a)是 具的前端視圖；（b )是部份剖面的側面圖。 第8圖是工具本體的立體圖。 第9圖本發明的實施態樣二的第二實施形態的 具的整體結構圖。 第1 〇圖是顯示工具本體的第一變形例，（a ) 工具的前端視圖；（b )是鑽鏊工具的部份剖面 圖，剖面部分是第1 〇圖 （a )中的A - 0 - A ’的剖面 面圖。 第1 1圖是顯示工具本體的第二變形例，（a ) 工具的前端視圖；（b )是鑽鑿工具的部份剖面 圖，剖面部分是第1 1圖 （a )中的A - 0 - A 5的剖面 面圖。 【主要元件符號說明】 〇 9 :本體構件 10:鑽鑿工具 1 1 :工具本體 1 2 :鑽孔桿 1 3 :鋼管 1 4 :中間套筒 鑕鑿工 鑽鑿工 鑽鑿工 是鑽鑿 的側面 線的剖 是鑽鏊 的側面 線的剖 -43 - (40) (40)1333522 1 5 :前端部 1 6、4 7、8 6 :排出溝 ]6 a :溝底面 1 6 b :溝側面 1 7 :缺口部 1 7 a :切刃側面 1 8 :切刃部 2 1 ' 3 4 :流路 2 4、6 2 :流體供給口 3 0、4 6、S 9 :連結孔（被連結部 3 5、3 6 :流體供給口 5 1 a :傾斜面 5 6 :鑽削刀頭（切刃部） 8 2、4 2 :連結部 4 3 :螺旋葉片部 5 〇 :篩孔 5 1 :壓力閥 5 4 :薄膜部 6 1 :空氣供給口 6 4 :空氣流路 74 :套筒 8 0 :穩定器 8 5 :傾斜面 〇 :軸線 -44 - 1333522 (41) L]、L2 :連結部的尺寸 T :旋轉方向1333522 (1) Inventive Department, [Technical Field of the Invention] The present invention relates to a steel pipe (casing; casing) in which a drill rod is attached to a tip end of a tool body, and the tool body is on one side of the ground. A drilling tool is used to form a drilling hole, a drilling tool used for drilling a steel pipe, and a drilling operation using the drilling tool, and then an injection agent is injected to reinforce the steel pipe of the construction site. In addition, the present invention relates to a drill rod inserted into a sleeve at a front end of a tool body, and a drill hole is formed in a surface of the tool body by one side of the tool body, and the sleeve is sequentially connected. The rod and the sleeve are used to form a drilling tool used in a drilling operation of a predetermined depth. [Prior Art] In general, in tunnel excavation engineering, when excavating a site with poor geological conditions, in order to prevent the looseness of the wall surface of the tunnel, some methods are adopted: the method of excavating the tunnel is carried out before the site is reinforced. The pre-reinforcement method of the site carried out by the tunnel project in the past is called the "steel pipe first support method". It is a method of connecting a plurality of steel pipes on one side and using a hydraulic boring machine used for controlling tunnels from the periphery of the control surface. The steel pipe is embedded in the obliquely outward direction of the tunnel axis direction, and the injection agent is injected into the steel pipe buried outside the tunnel excavation area to reinforce the construction method of the ground plate. The construction condition of this steel pipe first supporting method is as shown in Fig. 5. This figure is a cross-sectional view of the direction of travel near the tunnel control surface 2 of the tunnel 1 under construction. The upper part of the tunnel 1 is made of concrete, steel, etc. (2) (2)1333522 3. What is indicated by the double-dot chain line 4 is the range of predetermined excavation continuous with the tunnel 1. Further, in order to reinforce the ground, a plurality of steel pipes 5 are embedded in the tunnel 1 and the outside of the control area, and the steel pipe 5 that is being connected to the hydraulic boring machine 6 is also shown in the figure; The steel pipe 5 after the application of the injection agent. The drilling tool to which the base end portion is coupled to the telescopic arm 7 of the hydraulic burring machine 6 has an inner rod for transmitting a striking force and a rotating force, and a drill bit mounted at the front end of the inner rod; And a steel pipe 5 for inserting the drill bit and the inner rod. A gap of a predetermined size is maintained between the steel pipe 5 and the inner rod, and the drill bit protrudes toward the front end side more than the steel pipe 5. Further, the flow path for supplying the drilling water is formed to penetrate the inner rod, and a fluid supply □ is formed on the drill bit in order to discharge the drilling water toward the place where the chisel is cut. As the drill bit drilled at the forefront advances, the steel pipe 5 is continuously inserted into the drill hole, and the inner rod and the steel pipe 5 are sequentially joined to bury the steel pipe 5 to a predetermined depth. At this time, the drilling debris such as soil sand and cuttings generated by the drilling is pushed out by the high-pressure drilling water supplied through the inner rod, and the gap between the steel pipe 5 and the inner rod is discharged to the drilling hole. The outside. After the completion of such a drilling operation, the drill bit and the inner rod are to be recovered, and in the injection operation, the injection agent 8 is injected into the steel pipe 5, and then the injection agent 8 is infiltrated from the steel pipe 5 to the ground plate to be reinforced. In this injection operation, the injection agent 8 is discharged to the ground side from the check valve of the mesh hole mounted on the steel pipe 5 (for example, please refer to Patent Document). [Patent Document 1] -6- (3) (3) 1333522 The patent document 1 is referred to as Japanese Patent Publication No. 8-121073 (Fig. 1). [Problems to be Solved by the Invention] However, in the above-mentioned steel pipe first supporting method, when drilling is performed, it may be caused by the drilling water infiltrating from the drilling place into the ground plate if the drilling hole and the surface are drilled. In the case where the covering soil is shallow, there is a problem that the structure on the earth surface is adversely affected, and in the case of a soft ground layer, there is a problem that the ground plate is loosened. In addition, sometimes the drilling water will flow out of the sieve hole for discharging the injection agent and permeate into the ground. In order to avoid this situation, it is necessary to use water for drilling or to reduce the amount of water used for drilling. However, this will in turn cause the drilling debris to accumulate in the gap between the steel pipe and the inner rod, and there is a problem in that the performance of discharging the drill cuttings is lowered. Therefore, since the chisel chip becomes difficult to discharge, not only the drilling speed is extremely slow, but also the drilling operation cannot be continued. In addition, even if it is desired to replace the drilling water with high-pressure air to discharge the drill cuttings, sufficient discharge performance cannot be obtained. Further, in the structure disclosed in Patent Document 1, the mesh hole in the steel pipe 5 is opened by opening the check valve or separating the check valve by the internal pressure of the injection agent at the time of the injection operation, and the steel pipe is opened. The outside is the hole wall of the drill hole, which may be hindered by the wall of the hole, which may cause the check valve to fail to open. In particular, due to the difference in the state of the drill, sometimes the soil sand is trapped between the steel pipe and the drill hole, and there is a problem that the pressure of the soil sand hinders the opening of the check valve. Therefore, because the check valve becomes difficult to open, the injection agent is difficult to discharge from the sieve -7- (4) (4) 1333522, no. The method is obtained to fully enhance the effect of the site. In addition, in the above-described steel pipe first work method, if the clay-like structure having high viscosity and poor fluidity is controlled, the drilled debris passing through the gap between the steel pipe 5 and the inner rod may be accumulated. This gap has a problem that leads to a reduction in discharge efficiency. Moreover, the drilled chips piled up in this way will be stacked in sequence, and will become unable to discharge the drill cuttings. As a result, there will be a possibility that the drilling operation cannot be continued. Moreover, in the case of a soft formation, in order to suppress the softening of the ground caused by the drilling water, and in the case where the covering soil between the drilling hole and the surface is shallow, in order to suppress the structure which is brought to the surface The impact of drilling water use must be reduced. Sometimes, it is necessary to use air instead of drilling water. In this case, the accumulation of drill cuttings will be particularly problematic. The present invention was developed in this context, and its purpose is to provide : A drilling tool that can prevent the looseness of the ground caused by the drilling water, can smoothly discharge the drill cuttings, and the steel pipe first method of using the drilling tool to reliably obtain the reinforcing effect of the ground. Further, it is an object of the present invention to provide a drilling tool for use in a steel pipe first work method, which can smoothly discharge the chisel cuttings without slowing down the drilling tool for the drilling operation. Further, it is an object of the present invention to provide a drill collar tool which can smoothly discharge drill cuttings without slowing down the drilling operation. [Description of the Invention] [Means for Solving the Problem] -8 - (5) (5) l333522 In order to achieve the above object, the present invention proposes the following aspects. The drilling tool of the present invention is provided with: a drill rod that can be rotationally driven around the axis; and a tool body mounted in front of the drilling direction of the drill rod; and a drill rod inserted therein In the state in which the drill pipe is formed of a cylindrical steel pipe having a predetermined gap, the bucking tool is provided with a flow of water supplied to the front side in the axial direction. The fluid supply port for communicating the drilling water in communication with the flow path is formed only at a position opened from the inside of the steel pipe. According to the drilling tool of the present invention, the fluid supply port of the tool body that communicates with the drilling water for discharging the drilling water is formed only at a position open from the inside of the steel pipe, that is, the opening position of the fluid supply port is formed only in Since the front end portion of the steel pipe is closer to the base end side than the front end portion of the steel pipe, the drilling water supplied from the drill pipe to the flow path provided on the tool body along the axis is discharged from the fluid supply port toward the inside of the steel pipe. The water used for drilling will form a water flow like pushing the drill-dust toward the gap between the steel pipe and the drill rod, which can prevent the drilling water from flowing toward the drilling site, thus preventing: drilling from the drilling water The phenomenon of looseness of the ground caused by the penetration of the chisel into the ground. In other words, the conventional fluid supply port is formed on the more front end side of the front end portion of the steel pipe and faces the drilling site, and therefore, the amount penetrated from the drilling site into the ground plate is large, but the present invention is The way to form the fluid supply port can reduce the amount of water used for the drill collar that penetrates into the ground. In addition, as long as the same amount of drilling water is supplied as in the past, the drill cuttings can be discharged without accumulating, and the drilling operation can be smoothly performed. Thereby, it is possible to prevent the discharge performance of the drill cuttings from being lowered, and to prevent the looseness of the site of the -9- (6) 1333522 caused by the penetration of the drilling water. move. Further, in the drilling tool of the present invention, the drilling operation is such that the opening of the fluid supply port is directed rearward in the direction of the tool. In the drill collar tool of the invention, the opening of the opening tool body of the fluid supply port is rearward in the direction in which the drilling is performed, that is, from the front to the rear of the flow direction, the body supply port is gradually inclined from the flow path to the outer side, so that the drilling is performed. The water is sprayed from the rear of the fluid supply port, and the water is prevented from flowing toward the front, which further reduces the amount of water that penetrates from the drilling site to the ground water, and allows the drilling chips to be smoothly arranged to the rear. Further, the drilling tool of the present invention is capable of independently supplying the drilling air passage separately from the above-described flow path, and the opening for discharging the drilling gas supply port in communication with the air flow path is The direction is toward the front of the drilling. The drilling tool of the invention is provided with an air flow path for supplying drilling air to the flow path, so that air for drilling and drilling can be separately supplied to the tool body 'and the air flow is used to spray the air for drilling. The opening of the air supply port is forward in the direction. Therefore, the drilling air generated by the drilling air to be sprayed into the drilling chisel will be introduced into the drilling air and be drilled with water from the steel pipe and the drill rod. The gap clearance is such that the air for drilling is formed to introduce the drilling chips into the steel pipe, thereby suppressing the flow of the drilling water to the front, and the smoothing can be performed, and the drilling of the characteristic body is performed toward the drilling. The square is formed obliquely to form a flow drill. The drilling in such a way is broken out. The tool, which sets the air flow of the air, can be used to drill the space independently of the drilling water channel. Inside the steel pipe, it is discharged. The airflow inside will drain the drill -10- (7) (7) 1333522. . Further, the drilling tool of the present invention is provided with: a drill rod that can be rotationally driven around the axis; and a tool body that is disposed in front of the drilling direction of the drill rod; and a drill hole inserted therein In the state of the rod, a drilling tool comprising a cylindrical steel pipe having a predetermined gap for the drill rod is characterized in that a pressure valve for discharging the injection agent is formed on the steel pipe. In the sieve hole, the above pressure valve is set to be 'not opened' under the pressure of the drilling water flowing, and is opened under the injection pressure of the injection agent. The invented drilling tool 'is formed a hoof hole on the steel pipe'. A pressure valve for discharging the injection agent is installed on the sieve hole. The opening pressure of the pressure valve is set to: drilling Under the pressure of water circulation, it does not open and will not open under the injection pressure of the injection agent, so that the drilling water flowing out into the construction site during the drilling operation can be suppressed. That is to say, if the pressure valve is not installed, the drilling water will flow out from the sieve hole and penetrate into the ground plate, so there will be a problem that the ground plate is loose. However, if such a pressure valve is provided, the drilling water can be suppressed. The outflow prevents the site from loosening. Further, only when the injection discharge pressure at the time of the injection of the injection agent causes the pressure valve to be opened, the injection agent can be surely discharged to allow it to permeate into the ground. Thereby, the reinforcing effect of the ground plate can be surely obtained. Further, the drilling tool according to the present invention is characterized in that the pressure valve includes a film portion located on an inner surface side of the steel pipe. The pressure valve of the drilling tool of the invention has a thin film portion on the inner side of the inner -11 - (8) (8) 1333522 of the steel pipe. Therefore, when the drilling operation is performed, the thin film portion can be used to suppress the drilling water. The outflow 'When the injection agent is injected, the film portion is deformed to allow the injection to be discharged. At this time, although the film portion is deformed outward by the pressure from the inner side of the steel pipe, but the film portion is located on the inner surface side of the steel pipe, the deformation of the film portion is not hindered by the hole wall of the drill hole. The pressure valve can still be opened. Moreover, the soil sand between the steel pipe and the drill hole is not blocked to hinder the opening of the pressure valve. Thereby, the injection agent can be smoothly discharged to obtain a good site reinforcing effect. Further, the drilling tool of the present invention is characterized by the above-described drilling tool, which is characterized in that it comprises a steel pipe provided with a pressure valve. The drilling tool of the invention is, for example, a drilling tool in which a fluid supply port is opened rearward in a direction toward a drilling direction of the tool body, and an air flow path for supplying air for drilling is provided. The steel pipe is provided with a pressure valve having a thin film portion. Therefore, when the injection agent is injected, the injection agent can be reliably discharged from the pressure valve. Thereby, the looseness of the ground plate can be prevented, and the reinforcing effect can be obtained. Further, the steel pipe first supporting method of the present invention has a drilling operation for forming a drilling hole in a ground plate and inserting a steel pipe; and, after leaving the steel pipe in the ground plate to extract the drilling rod and the tool body, injecting the injection agent The steel pipe first supporting method for reinforcing the injection work of the ground plate is characterized in that: the drilling water for washing away the drill cuttings generated during the drilling operation is sprayed from the fluid supply port of the tool body to the inside of the steel pipe. also. Another feature is that when the drilling operation is performed, the pressure valve of the sieve hole installed on the steel pipe is closed, and when the injection agent is injected, the profit is -12-(9) (9)1333522 With an infusion. Pressure to open the above pressure valve. The invention of the steel pipe first method is to use the drilling water sprayed from the fluid supply port of the tool body to the inside of the steel pipe to wash away the drilling debris generated during the drilling operation, thereby preventing the drilling water from being drilled. The ground caused by the penetration into the site is loose, and 'the drill shoulders will not be piled up for smooth drilling. Moreover, the pressure valve installed in the mesh hole of the steel pipe is closed when the drilling operation is performed, so that the outflow of the water for the boring machine can be prevented, and when the injection agent is injected, the pressure of the injection agent is used to make the pressure The valve is opened, so the injection agent can be discharged to prevent the ground from loosening and to reliably reinforce the site. Further, in order to solve the above problems, the present invention proposes the following technical solutions. The drilling tool of the present invention is provided with: a drill rod that can be rotationally driven around the axis, a joint rod having a joint portion at both ends; and a front end of the drilling rod installed in the direction of drilling a tool body having a joint portion; and a cylindrical sleeve for retaining a predetermined gap with respect to the drill rod in a state in which the drill rod is inserted; and a coupling rod for connecting the drill rod A drilling tool having a member (intermediate member) connected to the end portion, wherein a spiral discharge groove 'in the drill rod is formed on the entire outer circumferential surface of the tool body and the intermediate member A spiral blade portion is provided on the partial or entire outer peripheral surface. In addition, the term "intermediate member" is a general term for a member used for the joining operation of the drill rod, and specifically means an intermediate sleeve (excluding the tool body member), a stabilizer, and the like which will be described later. -13- (10) 1333522 This hair. The drilling tool is a spiral discharge groove formed on the tool body and the entire outer peripheral surface, and a spiral blade portion is provided on the drill rod or the entire outer peripheral surface, so that the sleeve is discharged toward the base end side. Drilling chips are agitated by the discharge spiral blade portion in the rotary drive, and can be prevented from being accumulated in the sleeve. Further, it is flushed along the discharge grooves and the spiral blades in the rotational drive, so that it can be smoothly discharged. By making such a structure that can easily discharge the drill cuttings, the amount of water used for drilling, or even if the air is used instead of the drilling, the drilling chips can be smoothly discharged without being piled up. The looseness of the site caused by drilling water and smooth work can be done. Further, the drilling tool according to the present invention is characterized in that, in the above-described drilling tool, a stabilizer having a connecting portion and a connecting portion at the rear end portion is provided between the drill rod and the tool body. A piece of discharge groove formed in a part or the entire outer peripheral surface of the stabilizer. In the drilling tool of the invention, the drill rod and the tool body are provided with a joint portion at the front end portion to form a joint portion at the rear end portion. Therefore, not only the straightness of the tool body during the drilling operation but also the straightness is ensured. A discharge groove is formed on a part or the entire outer peripheral surface of the stabilizer, so that the effect of the agitator drill chip drill chip being pushed away toward the base end side can be obtained by using the stabilizer. In this way, even the stabilizer can smoothly discharge the drill cuttings. Part of the component is slanted into the ditch and drilled to the base end to reduce water, and can only be drilled. It is specially constructed in the middle of the front end, and the stability between the spirals, the spiral shape and the use of -14 (11) (11)1333522 Further, the drill tool of the present invention is characterized in that: in the state in which the respective connecting portions are connected to the respective connected portions, the position is in the The dimension of the connecting portion on the outer side of the connecting portion in the axial direction is set to be 1 of the inner diameter of the sleeve. 5 times or less, in the state in which the connecting portions and the connected portions are connected to each other, the size of the connecting portion located outside the connected portion in the axial direction, that is, the removed The dimension of the joint portion inserted into the portion to be joined in the axial direction is set to be 1 of the inner diameter of the sleeve. 5 times or less, it is possible to suppress the accumulation of drill chips in the joint portion. In other words, 'where the connection portion of the discharge groove and the spiral blade is not formed, the original drill disk scrap is relatively easy to accumulate and the discharge efficiency is lowered. However, by setting the size of the connection portion within the above range, The reduction in discharge efficiency is suppressed. Thereby, the drill cuttings can be smoothly discharged. Further, the drilling tool of the present invention is characterized in that the above-described drilling tool is characterized in that an inclined surface which gradually expands toward the proximal end side is formed in the joint portion of the stabilizer, and the angle of the inclined surface with respect to the axis is 4 5 degrees or less. In the drilling tool of the invention, the angle of the inclined surface formed at the joint portion of the stabilizer with respect to the axis is 45 degrees or less, so that the adverse effect of the inclined surface on the discharge of the drill cuttings can be suppressed. In other words, if the angle of the inclined surface gradually expanding the diameter of the stomach toward the proximal end is 45 degrees or more, the drilling debris will be obstructed by the inclined surface when flowing toward the proximal end side, and there will be The drill chip is piled up in the joint portion. However, by setting the angle of the inclined surface to 45 degrees or less, it is possible to suppress the accumulation of the drill chips. Thereby, it is possible to suppress a decrease in the discharge efficiency of the drill cuttings. -15- (12) (12)1333522 Further, the drilling tool of the present invention is the above-mentioned drilling tool, characterized in that on the tool body, a drilling water can be supplied along the axis. a flow path; an opening of the fluid supply port that communicates with the groove bottom surface of the discharge groove from the flow path toward the proximal end side of the tool body. In the drilling tool of the invention, the opening of the fluid supply port that communicates with the flow path formed inside the tool body along the axis from the groove bottom surface of the discharge groove is toward the base end side of the tool body, in other words, the fluid supply port is The flow path is formed obliquely toward the bottom surface of the groove and toward the base end side of the tool body, so that the drilling water supplied to the flow path and ejected from the fluid supply port is sprayed toward the base end side of the tool body to Drain the drain. By spraying the water for the drill collar in this direction, the drilling chips passing through the discharge groove can be discharged more smoothly, and the discharge efficiency can be improved. Further, in order to solve the above problems, the present invention proposes the following technical solutions. The drilling tool of the present invention is provided with: a drilling rod that can be rotationally driven in a circumferential direction of the axis; and a tool body that is disposed in front of the drilling direction of the drilling rod; and the above-mentioned drilling hole is inserted therein In the state of the rod, the drill collar is formed by a cylindrical sleeve having a predetermined gap with respect to the drill rod, wherein the front end portion of the tool body is formed into a substantially conical shape, and the front end portion is formed from the front end portion The spiral discharge groove of the base end portion is formed on the side surface of the tool body. In the drilling tool of the invention, the front end portion is formed on the side surface of the tool body having a substantially conical shape, and a spiral 16 - 16 (13) 131335222 discharge groove is formed from the front end portion toward the base end portion. The drill chips generated by the drilling will flow toward the base end side along the tip end portion of the slightly conical shape, and are guided to the discharge groove to be introduced into the gap between the drill rod and the sleeve. In other words, the tool body is rotationally driven by the driving force transmitted from the drill rod, and therefore, the spiral discharge 冓 f @ f stir # drill cuttings and uses the side of the spiral discharge groove to push the drill cuttings to the base The end side pushes the flow. Thereby, the amount of water used for drilling can be reduced or even if the water for drilling is replaced by air, the swarf can be smoothly discharged without being piled up. Thereby, not only the looseness of the ground due to the drilling water can be suppressed, but also the drilling operation can be smoothly performed. Further, the drilling tool of the present invention is the above-described drilling tool characterized in that a notch portion is formed at a front end portion of the tool body so that a side surface and a front end of the cutting edge facing the rotation direction of the notch portion The cutting edge portion is formed on the intersection portion of the surface, and the side surface of the cutting edge is continuous with the groove side surface facing the front side in the rotation direction of the discharge groove, and the apex portion of the front end portion and the cutting edge portion are subjected to wear resistance treatment. . In the drilling tool of the invention, the notch portion is formed at the front end portion of the tool body having a substantially conical shape, and the cutting edge portion is formed at the intersection of the side surface of the cutting edge and the front end surface facing the front side in the rotation direction of the notch portion. In other words, the edge portion on the rear side in the rotation direction of the missing portion is regarded as the cutting edge portion, and the side surface of the cutting edge is continuous with the groove side surface facing the front side in the rotation direction of the discharge groove, so that the drill is generated even by the cutting edge portion. Chiseling and drilling debris are also guided to the discharge channel by the side of the cutting edge. In this manner, the cutting edge portion is formed in such a positional relationship that the drill cuttings can be guided to the discharge groove. Therefore, the drilling chips can be smoothly discharged. In addition, the apex portion of the front end portion and the cutting edge portion are subjected to wear resistance treatment of -17 - (14) (14) 1333522, so that the wear of the apex portion and the cutting edge portion can be suppressed. For example, the wear resistance treatment is : A hard thick piece covering the apex portion of the front end portion and the cutting edge portion is formed, or a super hard blade is implanted. Thereby, the positional relationship between the above-described discharge groove and the cutting edge portion can be maintained for a long period of time, and even if the boring distance is long, the discharge efficiency of the drill cuttings can be prevented from being lowered. Further, the drilling tool of the present invention is the above-described drilling tool characterized in that a flow path for supplying drilling water along the axis is formed on the tool body; and the flow path and the discharge are performed from the flow path The opening of the fluid supply port that communicates with the groove bottom surface of the groove faces the proximal end side of the tool body. In the drilling tool of the invention, the opening of the fluid supply port that communicates with the flow path formed inside the tool body along the axis from the groove bottom surface of the discharge groove is toward the base end side of the tool body, in other words, the fluid supply port is The flow path is formed obliquely toward the bottom surface of the groove and toward the base end side of the tool body, so that the drilling water supplied to the flow path and ejected from the fluid supply port is sprayed toward the base end side of the tool body to Drain the drain. By spraying the drill collar water in this direction, the drill cuttings passing through the discharge groove can be discharged more smoothly, and the discharge efficiency can be improved. Further, the drilling tool of the present invention is the above-described drilling tool, characterized in that an annular drill disposed on an outer circumference of the tool body is installed at a front end of the sleeve, and a front end portion of the ring drill The circumferential surface has an inclined surface which is closer to the outer peripheral side from the rear end side toward the front end side, and the cutting edge portion provided at the front end portion is also formed with an inclined surface which is also inclined. -18- (15) (15)1333522 The drilling tool of the invention has a cutting edge portion provided with a cutting edge portion at the front end portion, and an inner circumferential surface of the front end portion and the cutting edge portion is formed from the rear end side to the front end The side becomes closer to the inclined surface on the outer peripheral side, in other words, 'from the cross-sectional view along the axis, the two inclined faces facing each other form a "eight-shaped shape j, so the chiseled chips are guided by the inclined faces. The inside of the ring-shaped drill bit is prevented. Thereby, the drilling chips passing through the discharge groove of the tool body can be prevented from flowing to the outside of the ring-shaped drill bit, and the drilling chips can be smoothly discharged. [Effect of the Invention] As described above, according to the present invention The drilling tool, the fluid supply port communicating with the flow path of the tool body is formed only at the position of opening from the inside of the steel pipe, so that the drilling water can be prevented from infiltrating into the ground plate from the drilling place, and the drilling waste is not reduced. The performance can prevent the looseness of the ground plate caused by the penetration of the drilling water. Moreover, the opening of the fluid supply port is directed rearward of the drilling direction of the tool body, which can further inhibit the drilling water from flowing to the drilling. Moreover, the drilling chip can be discharged more smoothly to the rear. Further, the opening of the air supply port is forward toward the direction of the drilling, and the air for drilling is formed to introduce the drilling dust into the steel pipe, so The drilling water can be inhibited from flowing to the front, and the drilling dust can be drained more smoothly by using the drilling air and the drilling water. The drilling tool according to the present invention can be set by: being installed in the sieve hole The opening of the pressure valve (the pressure required for opening) of the injection agent is prevented to prevent the drilling water from flowing out into the construction site during the drilling operation, and -19-(16) (16)1333522 is injecting the agent. In the injection operation, the injection agent can be reliably discharged. Further, since the pressure valve of the thin film portion located on the inner surface side of the steel pipe is provided, the injection of the injection agent is performed, and the deformation of the thin film portion is not affected by the drilled wall. By obstructing the soil sand or the like, the pressure valve can be surely opened, and the injection agent can be smoothly discharged. Further, the drilling tool including the air supply port and the pressure valve described above can suppress the drilling operation. The drilling water penetrates into the ground plate' and the injection agent can be reliably discharged from the pressure valve. Further, according to the steel pipe first supporting method of the present invention, the drilling water is sprayed into the inside of the steel pipe to prevent the ground caused by the drilling water. The looseness can efficiently discharge the chisel and smooth the drilling operation. Also, because the pressure valve is used to prevent the water from flowing out of the drill collar, the looseness of the ground plate can be prevented, and the pressure of the injection agent can be used to open the pressure valve. Therefore, the injection agent can be surely discharged to reinforce the ground plate. Further, according to the drilling tool of the present invention, since the spiral discharge groove and the spiral blade portion are provided, the drilling chips in the agitating sleeve can be obtained and pushed to The effect of the base end side can smoothly discharge the drill cuttings even if the amount of drilling water is used, thereby not only suppressing the looseness of the ground caused by the drilling water, but also smoothly performing the drilling operation. Further, a spiral discharge groove is formed in the stabilizer attached between the drill rod and the tool body, so that the same smooth discharge of the drill cuttings can be obtained. Further, in a state in which the respective connecting portions are connected to the connected portion, the dimension 'in the axial direction of the connecting portion located outside the connected portion is set to: -20- (17) 1333522 The inner diameter of the sleeve . 5 times or less, the part can suppress the decrease in the discharge efficiency, and the joint angle formed in the stabilizer is 45 degrees or less. Therefore, the adverse effect caused by the chip can be suppressed, and the fluid supply port is formed to be supplied to The flow path is sprayed from the fluid to the base end side of the tool body toward the base end, the chisel is discharged, and the discharge can be increased, and the drilling according to the present invention forms a spiral discharge groove. The chisel chip will push the drill cuttings to the base end side to reduce the amount of water used for drilling. It can also accumulate to reduce the discharge performance, not only the looseness of the disc, but also the smooth entry, the apex portion and the cutting edge side of the cutting edge portion. Since the surface of the discharge groove is continuous, even if the drill cuttings are smoothly guided to the discharge for a long time, the fluid supply port is formed by the drilling of the base end side which is ejected from the fluid supply port. The discharge can be increased, so that the suppression of the accumulation of the drilled chips on the inclined surface of the joint kneading portion with respect to the axis can be suppressed, and the discharge efficiency of the inclined surface for discharging the drill-drilling chips can be reduced. Opening to the base end side of the tool body, the drilling water sprayed from the given port will be sprayed into the discharge groove, so that the drilling efficiency through the discharge groove can be more smoothly performed. The tool is on the side of the tool body so that the effect of the drilling flow in the agitating sleeve can be obtained. In this way, even if the drill cuttings are smoothly discharged, the pile can be prevented from being subjected to the drilling operation caused by the drilling water. The wear-resisting treatment is applied to the part, and the side surface of the groove in front of the cutting direction is shaped, and the side groove of the cutting edge can still be used. Opening toward the base end side of the tool body, the drilling water will be directed toward the tool body, and the efficiency of discharge through the discharge groove can be more smoothly discharged. -21 - (18) (18)1333522 In addition, The front end portion of the ring-shaped drill bit and the inner peripheral surface of the cutting edge portion form an inclined surface, so that the drill cuttings can be guided to the inner side of the ring-shaped drill bit, and the discharge efficiency of the drill cuttings can be improved. [Embodiment] [Embodiment of the Invention] [First Embodiment] An embodiment of the present invention will be described with reference to the drawings from the drawings to the fourth drawing. Fig. 1 is a view showing a distal end portion of a drilling tool 1 第一 according to a first embodiment of the present invention, and Fig. 1(a) is a view showing the drilling tool 1 观察 as viewed from a distal end side of the axial axis; b) is a side view of a partial cross section of the drilling tool 10; the cross-sectional portion of Fig. 1(b) is a cross-sectional view of the A-0-A' hatching shown in Fig. 1(a). Further, the direction of the arrow shown in Fig. 1(a) is the rotation direction T at the time of drilling, and the left side of the first figure (b) is the front end side of the drilling tool 10, and the front end direction is the front of the drilling direction. . In this embodiment, the drilling tool I 具备 has a tool body 11 for drilling the ground plate at the foremost end; and a drill rod 1 2 for attaching the tool body 11 to the driving force at the front end; It is constructed by inserting a cylindrical steel pipe 13 of the drill rod 1 2 . The tool body 11 is composed of: a body member 09 mountable to the drill rod 12; and a drill bit 15 mounted at two places at the front end portion of the body member 〇9. The body member 09 is a slightly columnar member centered on the axis 〇, and a hole circumscribing the axis 〇 is used for the -22-(19) (19)1333522 mounting hole on the base end face 14a. The mounting hole 16 of the rod *] 2 is at its front end face 丨 4 b is a support hole through which two rotatably supported drill bits 穿 5 are worn] 7, 7, which are the two support holes] 7 ' 17 The center 疋 & is off the axis 〇 position. In the vicinity of the base end portion of the inner peripheral surface 16 a '' of the mounting hole 6, two pin holes 1 9 for inserting a fixing pin 18 perpendicularly intersecting the axis 穿 are pierced. The inner peripheral surface is opened in the mounting hole]6. The inner peripheral surface 16 a on the front end side of the mounting hole 6 is the female thread portion 2 〇, and the bottom surface 16 b ' of the mounting hole 16 is formed to have a predetermined depth to the axis 〇 The center of the flow path 2]. On the outer peripheral surface of the main body member 09, a fluid supply port 2 4 which is formed from the front end surface 4 to the proximal end side of the discharge groove 2 2 'flow path 2 1 is a groove bottom surface 23 which is opened to the discharge groove 2 2 to allow the flow The road 2 1 is in communication with the discharge channel 2 2 . The fluid supply port 24 is provided so as to be inclined from the flow path 2 to the discharge groove 22 and to the axis 〇 from the front end side toward the base end side, and is open to the rear side (base end direction) toward the drilling direction (base end direction) twenty three. Further, as shown in the figure, when the tool body 1 1 is inserted into the steel pipe 13, the opening of the fluid supply port 24 is located inside the steel pipe 3. In other words, the opening position of the fluid supply port 24 is set. Cheng: It will not be at the front end of the steel pipe 13. Further, as shown in Fig. 1(a), the discharge grooves 22 are provided at two places on the main body member 09, and are oriented in mutually opposite directions, and each of the discharge grooves 22 is formed with a fluid supply port 24, respectively. Further, on the front end side of the groove bottom surface 23, an inclined surface 25 in which the groove bottom surface 23 is expanded toward the front end side is formed. Further, in the main body member 09, the outer peripheral surface portion of the discharge groove 22 is not formed, and the sliding portion -23-(20) (20) 1333522 2 26 having a predetermined outer diameter on the front end side is formed; The proximal end side of the joint portion 26 has a larger diameter portion 27 than the sliding portion 26, and the inclined surface facing the front end side between the sliding portion 26 and the large diameter portion 27 is regarded as a conveying surface 28 . Further, the drill bit 5 includes a head portion 3 1 in which the drill blade 3 〇 is implanted, and a shaft portion 3 2 provided on the proximal end side of the head portion 31, and the shaft portion 3 2 is inserted in the support ii] 7 is locked in the axial direction, whereby the drill bit 1 is rotatably mounted on the body member 090 centering on the central axis 0 2 of the support hole 17. When the head 31 is viewed from the front end, it is a slightly semicircular shape 'when drilling is performed', and the positional relationship of the heads 3 as shown in Fig. 1(a) becomes the expanded state. . Further, if the tool body 1 is rotated in a direction opposite to the rotational direction T, the head 31 is rotated about the central axis 02, and the circular faces 3 1 a of the two heads 31 are formed together. In a slightly circular shape, it becomes a reduced diameter, and so that it can pass through the inside of the steel pipe 13. Further, the 'drill rod 1 2 is a tubular rod' in which the flow path 4 is penetrated along the axis of the shaft, and a male thread portion 4 which is screwed to the female thread portion 20 of the tool body η is provided at the front end portion thereof. A recess 4 2 is formed on the proximal end side of the male screw portion 41. The male thread portion 4 1 is screwed to the female thread portion 2 〇 'the position of the recess portion 42 corresponds to the position of the pin hole 9 , and the fixing pin 18 is inserted into the pin hole 1 9 ' to be engaged with each other. The tool body Η is attached to the drill rod 12 in a state in which the flow path 2 1 and the flow path 40 are continuous with each other in the direction of the axis 〇. Further, a cylindrical sleeve head 45 is attached to the front end of the steel pipe 13 by welding or the like, and the inner diameter of the sleeve head 45 is smaller than the inner diameter of the steel tube]3 -24-(21) (21)1333522 Further, the fitting portion 46 on the proximal end side is insertable into the steel pipe 13 , and the proximal end surface 17 of the fitting portion 46 is located on the inner side of the steel pipe 13 . As shown in Fig. 1(b), the outer peripheral surface of the sliding portion 26 of the main body member slidably contacts the inner peripheral surface of the sleeve head 45 in a state where the tool body Η is inserted into the steel pipe 13, and the body The conveying surface 28 of the member 09 can abut against the base end face 47. Further, the opening position of the fluid supply port 24 is located closer to the base end side than the sleeve head 45. Further, a gap 44 of a predetermined size is provided between the steel pipe 13 and the drill rod 12. Further, as shown in Fig. 2, in the steel pipe 13, a sieve hole 50 for discharging an injection agent is formed at a predetermined interval, and a pressure valve 51 is attached to the mesh hole 50. The pressure valve 51 is a rubber valve which is set such that when the drill hole is circulated in the pressure state inside the steel pipe 13 during the boring operation, it is not opened, only when the injection operation is performed. The pressure of the injection agent is turned on, and as shown in Fig. 3, it is provided with an annular wall portion 5 2 which can be fitted into the inner circumferential surface of the sieve hole 50; The thin film portion 54 of one end portion of the outflow port 53 formed by the inner peripheral surface of the wall portion 52. Further, as shown in Fig. 3, the outer peripheral surface 52a of the annular wall portion 52 is formed into a tapered shape, and the outer diameter thereof is gradually reduced toward the side of the thin film portion 54, and the height dimension of the annular wall portion 52 is set to be The thickness of the steel pipe 13 is approximately the same size, and the radius of the film portion 54 is set to be smaller than the height dimension of the annular wall portion 52. Further, the thickness t of the film portion 54 is different depending on the setting of the opening pressure, and can be obtained from 〇. 2~0. Make an appropriate selection within the 6mm range. Further, depending on the state of use, a cross-shaped crack 55 or -25-(22) 1333522 may be formed in the film portion 54 to form a pinhole at the center portion to adjust the discharge amount of the injection agent. Further, the pressure valve 51 is fitted from the outer side of the steel pipe 13 so as to be attached to the inner side of the steel pipe 13 so that the thin portion I is inside the steel pipe 13. When the drilling operation is performed by the drilling tool 10 of the above configuration, the base end side of the drill rod 12 is connected to a boring machine (not shown) except for the rotational force of the outer circumferential direction to which the axis 0 is applied. In addition to the driving force in the direction of the axis 以及 and the driving force in response to the necessary striking force, etc., the drilling water is also supplied to the flow path 40 in a high pressure state. This driving force is transmitted to the tool body 1 via the drill rod 12, and the drilling hole is formed by the drill bit 15 to form a drilling hole, and the propulsive force is transmitted from the conveying surface 28 to the base end face 47 so that The steel pipe 13 is inserted into the drilling hole. Further, the drilling water is supplied from the flow path 4 to the flow path 21 and is ejected from the fluid supply port 24 to the discharge groove 22. The drilling chips generated by the drilling face and flowing into the discharge groove 2 2 are further washed by the jetted drilling water to the base end side, and are discharged to the drilling through the gap 48. The outside of the hole. At this time, since the screen hole 50 is provided with the pressure valve 5 1, it is possible to suppress the drilling water from being discharged from the screen hole 50. With this drilling operation, the drill rod! 2 and the steel pipe]3 are sequentially connected to form a drilling hole of a predetermined depth. After the end of the drilling operation, the drill bit 15 is reduced in diameter to extract the tool body]1 and the drill rod 12, and the steel pipe 13 is buried only in the ground. The end of the direction of the front of the 3 toward the tube to the steel surface from a broken Pu, the side of the stone water 4 to the inside of the 5 pressure of the part with 3 membranes and a thin 'tube will be the steel industry in the pressure of the The agent is injected into the outer side of the injection-injection side I-side base flow -26-(23) (23)1333522, and the injection agent is discharged from the outflow port 5 3 of the pressure valve 5 1 To the site. Further, if a cross-shaped slit 5 5 or a pinhole is formed in the film portion 5 4, the cross-shaped slit 5 5 or the pinhole will be deformed to become an enlarged shape of the cross-shaped slit 5 5 ' or a pinhole. As a result, the injectant will spit out from the outflow port 5 3 and penetrate into the site: the site is reinforced. As described above, the fluid supply port 24 formed on the body member bore 9 of the drilling tool is formed such that the opening position of the fluid supply port 24 is located more inside the steel pipe 13 than the sleeve head 45. The position on the base end side and the direction toward the base end = opening to the groove bottom surface 23, so that the drilling peripheral water can be injected to be introduced into the gap 48 toward the base end side. In this way, it is possible to suppress the flow of the drilling water toward the front end side of the steel pipe 13, so that the drilling water can be prevented from seeping into the ground, and the adverse effect of the looseness of the ground due to the drilling water can be prevented. Furthermore, it is not necessary to reduce the amount of water used for drilling, so that the discharge performance of the drill cuttings is not lowered, and the drilling operation can be smoothly performed. Further, as shown in Fig. 5, when the drilling is performed upward at a predetermined angle, the drilling water can flow more easily toward the base end side, so that the drilling water can be more inhibited from flowing toward the front end side of the steel pipe 13. . Further, since the pressure valve 51 is installed, the drilling water can be prevented from being discharged from the sieve hole 50, so that the adverse effect such as the looseness of the ground caused by the drilling water can be prevented. Further, the pressure valve 51 is set to be opened according to the pressure of the injection agent, so that the injection agent can be reliably discharged. For example, the base end side of the gap 48 is open toward the outside of the chisel hole, so the pressure of the drilling water used to discharge the drill cuttings to the pressure valve 51 is only atmospheric pressure -27- (24) (24 ) 13332252 degree, and the injection pressure of the injection is set to: 1 Ο χ 1 Ο 3~4 Ο χ 1 〇 3Pa range. Further, the film portion 54 which is deformed toward the outside when opened is formed into the above-described shape and is located inside the steel pipe 3, so that the film portion 5 is not deformed to the outside of the steel pipe 3, but the injection can be utilized. The pressure of the agent causes it to deform properly. In other words, the hole wall of the drill hole and the soil sand which is clogged between the hole wall and the steel pipe 3 do not become an obstacle to the deformation of the film portion 54. In this way, the injection amount can be discharged by a predetermined discharge amount, and the ground can be reliably reinforced. Next, a drilling tool 10 A according to a second embodiment of the present invention shown in Fig. 4 will be described. The same components as those of the drilling tool according to the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. This drilling tool] Ο A ' is a pipe 60 inserted in the flow path 4 〇 and the flow path 2 1 , and an air supply port 6 which is opened from the flow path 2 1 toward the inclined surface 25 is formed; The flow path 2 1 faces the fluid supply port 62 that is open to the proximal end side of the groove bottom surface 23 . In the front end portion of the pipe 60, a sealing portion 63 which can partition the inside of the flow path 21 from the front end side and the base end side in the hydrodynamic view is provided. The inside of the pipe 60 is regarded as the air flow path 64'. The gap between the 60 and the flow path 4A and the flow path 2 1 serves as a drilling water flow path 65. Further, the air supply port 61 is connected to the distal end side in the flow path 2 I partitioned by the sealed portion 63, and the fluid supply port 62 is connected to the proximal end side in the flow path 2''. The air on the surface side that is supplied from the air flow path 64 into the flow path 2 i by the appropriate type pipe 60' is ejected from the air supply port 6], and is supplied from the drilling water flow path 65 to the flow path 2] The drilling water on the base end side inside will be ejected from the -28-(25) (25)1333522 fluid supply port 62. The drilling chips generated at the drilling site will be introduced into the discharge channel 22 by the drilling air sprayed toward the drilling hole and enter the inside of the steel pipe 3, and then the water is drilled in the gap 48 by the drilling water. discharge'. In other words, by jetting the air for drilling, the drill cuttings can flow without accumulating in the drilling location, and the airflow of the drill cuttings entering the inside of the steel pipe 13 can prevent the drilling water from flowing forward. . In this way, the drilling water can be prevented from infiltrating into the ground from the drilling site, and the discharge performance of the drill cuttings can be prevented, so that the drilling operation can be smoothly performed. Further, in the present embodiment, the "fluid supply ports 24, 6 2 are open toward the proximal end direction, but the position of the fluid supply ports 24, 6 2 is formed so that the fluid supply port 2 4' can be provided. 6 2 The water that is sprayed out of the drill does not flow to the position of the drilling site, even if it is not open toward the base end. Further, the tool body may be constituted by a combination of a drill having no function of expanding and contracting diameter and a ring bit. Further, the present invention is not necessarily limited to a drilling tool of such a structure that the conveying surface 28 transmits the propulsive force to the base end face 47 so that the steel pipe 3 is inserted into the drilling hole, and the present invention can also be applied to A drilling tool of such a structure that the propulsive force is transmitted to the base end portion of the steel pipe 13 so that the steel pipe 13 is inserted into the drilling hole. [Second Embodiment] A second embodiment of the present invention will be described with reference to Figs. 6 to 11 and Fig. 6 is a view showing a drilling tool j 〇-29- (26) of the first embodiment of the present invention. The overall structure of (26)1333522, Figure 7 shows the front end of the drilling tool 1 〇. Further, Fig. 7(a) is a view of the drilling tool from the front end side of the axis 〇! The diagram of the arrow 'the direction of the arrow shows the direction of rotation T when drilling; the figure 7 (b) is a side view of the partial section of the drilling tool], and the left side is the front side of the drilling tool 10 The front end direction is the front that is considered to be the direction of the drilling. The drilling tool] has: a spiral drill bit (tool body) 1 1 for drilling the ground plate at the foremost end; and a drill rod for mounting the driving force at the front end of the screw head] 1 And a cylindrical steel pipe (sleeve) 3 for inserting the drill rod 12; and an intermediate sleeve (intermediate member) 4 for connecting a plurality of drill rods 1 2 . The auger bit U is a columnar member in which the tip end portion 15 is formed into a substantially conical shape, and the entire outer peripheral surface from the tip end portion 15 to the proximal end side is formed by a left spiral to form a spiral discharge groove 16 6 . The spiral shape which is twisted in the direction opposite to the rotation direction T from the front end side to the base end side is formed in the circumferential direction of the columnar member, and a plurality of strips are formed at equal intervals (three in the figure). The discharge groove 16 has a groove bottom surface 16a which is slightly protruded in the center portion, and a groove which has a cross-section in the shape of a gate which extends in the diametrical direction of the auger bit 11 and faces each other, and which is a gate shape. The conical surface 15a of the front end portion 5 is continuous until the base end surface 11a of the auger bit 1 is formed. Further, the discharge groove 16 is formed in such a range that the leading angle is 45 to 75, and the groove depth is 5 mm or more. A plurality of places (three places are shown in the figure) of the front end portion 15 are notched portions 17 formed in a V shape, and a side surface of the notch portion 17 in the direction of the rotation T is regarded as a side surface of the cutting edge 1 7 a A portion including the ridge line formed by the side faces of the cutting edge 1 7 a -30-(27) (27) 13332522 and the conical surface 5 a is regarded as the cutting edge portion 18. As shown in the perspective view of Fig. 8, the cutting edge side surface 17a is continuous with the groove side surface 6b of the discharge groove 16 in the direction of the rotation direction T, and the notch portion 7 is interposed therebetween. The other side surface 17b is formed by continuously forming the notch portion 17 in a continuous manner with the groove bottom surface 16a across the ridge line 20. Further, a predetermined range (a range indicated by a thin line in the figure) covering the vertex portion 2 1 of the tip end portion 15 and the cutting edge portion 8 is formed as a hardened material covering portion for performing the abrasion resistance treatment. Further, the outer peripheral portion of the discharge groove 16 is not formed in the "auger bit" 1 , and is formed by the step portion formed at the two portions from the base end side: the first outer peripheral portion 22 and the outer circumference portion The outer peripheral portions of the outer peripheral portions on the distal end side of the portion 23 and the three outer peripheral portions of the third outer peripheral portion 24 are formed to have a small outer diameter. Further, between the first outer peripheral portion 2 2 and the second outer peripheral portion 23, an inclined surface 2 5 ' toward the distal end side is formed between the second outer peripheral portion 23 and the third outer peripheral portion 24, and is formed toward the distal end side. Inclined face 26. Further, in the third outer peripheral portion 24, a ridge portion 27 projecting in the diameter direction is formed. Further, the base end face 1 1 a is a connection hole (connected portion) 30 for arranging the drill rod 12 centered on the axis 〇, and the base end of the inner peripheral surface 30a of the joint hole 30 is opened. In the vicinity of the portion, there is a pin hole 32 which is perpendicularly intersected with the axis 用来 for inserting the fixing pin, and a part of the side surface of the pin hole 32 is formed in the connecting hole 30, and is located on the front end side of the pin hole 32. The inner peripheral surface 30a is formed with a female screw portion 33, and the bottom surface 30b of the connecting hole is formed with a flow path 34 having a predetermined depth centered on the axis 〇. Further, the fluid supply port 3 3 6 -31 - (28) (28) 1333522 which is in communication with the flow path 34 is opened to the bottom surface 16 a of the groove. The fluid supply port 35 is inclined from the flow path 34 toward the discharge groove 6 so as to be inclined toward the axis 0 from the distal end side toward the proximal end side, and is open to the rear side (base end direction) toward the drilling direction (the base end direction). 6 a, the fluid supply port 36 opens to the groove bottom surface 16a in front of the drilling direction (front end direction). The drill rod 2 is a tubular rod having a flow path 40 extending through the axis 0, and has a gap of a predetermined size between the steel pipe 13 and the drill rod 12. At both end portions of the drill rod 2, a joint portion 42 having a male screw portion 41 is formed, and the entire outer peripheral side surface is except for the joint portion 42, that is, a part of the outer peripheral side surface is formed with a spiral blade portion. 4 3. The spiral blade portion 43 is formed in a spiral shape in the same direction as the discharge groove 16, and the guide angle is set in the range of 4 5 ° to 7 5 °, and the height of the spiral blade portion 43, that is, the dimension in the diameter direction is set to 5 mm or more. Further, the connecting portion 42 is formed in order from the end portion: a female screw portion 41 that can be screwed to the male screw portion 33; and a concave portion that is rotated back and forth around the axis 〇; The grip portion 44 on the outer side of the hole 3 〇. The recessed portion is formed at a position corresponding to the pin hole 3 2 at the time of joining, and is a portion for engaging with the fixing pin inserted into the pin hole 32 in the direction of the axis '. The grip portion 44 is performed when When the drill rod 1 2 is connected to the auger bit j], it is 'the portion held by the grip tool. In the state in which the connecting portion 4 2 is coupled to the connecting hole 3 〇, the dimension L1 in the direction of the axis 0 of the connecting portion 42 such as the grip portion 44 just outside the connecting hole 32 is the steel tube 13 The connecting portion 42 is formed so as to be 15 times or less the inner diameter 〇. -32- (29) 1333522 Further, the intermediate sleeve 14 is formed with a connection hole (connected portion) having a female screw 45 at both ends, and the connection hole 46 is formed through the line. Its center. Further, the entire outer peripheral surface of the intermediate sleeve 14 is formed with a discharge groove 47 which is twisted in the same direction as the discharge groove 16 of the auger bit 1 1 . Further, in a state in which the connection ί of the drill rod I 2 is coupled to the connection hole 46 of the intermediate sleeve 14 , the dimension of the coupling portion 42 located just outside the hole 46 in the direction of the axis 0 is fixed. It is: 5 times or less of the inner diameter D of the steel pipe 13. Further, the discharge groove is formed: the lead angle is 45. ~75. The range of the groove is 5 mm or more. At the tip end of the steel pipe 3, a cylindrical sleeve head 48 is attached by means of welding or the like. The sleeve head 48 has a front end portion 4 9 which is located closer to the front end side than the steel tube 13 as shown in Fig. 7 and a base end portion which is more narrowed with respect to the inner and outer diameters of the end portion 4 9 ' 50, at the base end edge of the base 50, a base end face 5 Oa which is gradually enlarged in diameter toward the base end side is formed. The outer peripheral surface of the base end portion 50 can be fitted to the inner peripheral surface of the steel pipe to be formed to be slidably contacted with the second outer portion 23 of the auger bit 11, and the inner and outer diameters of the front end portion 49 are formed to be approximately equal to the diameter of the steel pipe 13. Further, in the axial direction of the inner peripheral surface of the distal end portion 49, an annular groove 5 is formed on the inner circumferential surface which is spirally wound toward the axis ,, and the annular groove 5 is along When the cross-section of the axis 〇 is viewed, it has a predetermined size in the direction of the axis 0, and is formed in a U shape. Further, the 'annular drill bit 52 is attached to the front end of the sleeve head 48, and the sleeve head 48 is freely rotatable, and the β 42 connection on the shaft can be set in the direction of the axis 〇. Yes, with the front end inclined 13, the inner and outer circumferences of the circumference are visible in the shape of the -33- (30) 1333522 sliding within the predetermined range. The ring-shaped drill bit 52 has a front end portion 5 3 which is located further on the front end side than the sleeve head 48, and a base end portion 5 4 which is slidably contacted with the inner peripheral surface of the front end portion 4 9 of the sleeve 48. Further, in the base end edge of the base end portion, 'on the base end edge which is located further inside than the inner circumference of the base end surface 50 of the sleeve head 48' is formed with a slope which gradually increases toward the base end side. Base end face 5 4 a. The inner peripheral surface of the ring-shaped drill bit 52 is slidably contacted with the third outer peripheral portion 24 of the rotary drill bit 1 1 and is formed with a concave strip portion 5 5 that can accommodate the strip portion 27. Further, the front end surface of the front end portion 5 3 is a tapered inclined surface 5 3 a which is formed to gradually increase in diameter on the distal end side, in other words, the two inclined surfaces 5 3 a which face each other in the cross section along the axis 0 are The shape is "eight characters". Further, 'on the outer peripheral surface of the base end portion 514 of the ring-shaped drill bit 52, there is formed a groove 5' that surrounds the outer periphery of the axis 为 around the axis 0. When viewed in cross section of the axis 0, the U-shape is formed by inserting the annular drill bit 5 2 into the inner periphery of the front end portion of the sleeve head 48, thereby making the annular groove 56 of the annular drill bit 52 and the sleeve head The annular groove defined by the annular grooves 5 1 is aligned with each other, and a locking member 57 that elastically deforms in the radial direction with respect to the axis 0 is interposed. The locking member 57 has a fitting groove to the annular groove. The C-locking ring of the cross-sectional shape of 56 is shorter because the dimension on the axis 0 of the locking member 57 is set to be smaller on the axis of the annular groove 5, so the locking member 57 is in the annular groove 51. The axis slides in the direction of the 〇. The ring-shaped drill bit 52 can be mounted to free the spinner head 54 relative to the casing top 48 by the snap-fit of the annular member formed by the locking member and the annular groove 51 and the annular groove 56. The face diameter screw is convex toward the ring. The 48-inch type is more than 5 7 square turns -34 - (31) (31)1333522 and can slide. Further, the boring head 58 which is implanted in a plurality of places (three places are shown in the figure) protruding toward the front end side of the ring-shaped drill bit 5 2 is regarded as a cutting edge portion, and the drilling head 5 8 The shape is also a shape having an inclined surface 58 8 which is inclined toward the inner side. Further, in a position in the circumferential direction in which the drilling head 58 is implanted, when the auger bit Π and the ring bit 52 are engaged in the circumferential direction, the cutting edge portion 18 of the auger bit 1 is Set to be more forward than the drilling head 58. Further, in order to transmit the driving force from the driving device to the drill rod 2 and the steel tube 3, an adjustment rod 60 is attached to the base end of the drill rod I 2 , and a base end of the steel tube 13 is mounted. Adapter 6 1. The adjustment lever 60 has a lever main body portion 6 3 having a spiral discharge groove 6 2 formed on the outer peripheral side surface, and a shaft portion 64 extending from the lever main body portion 63 toward the proximal end side, at the lever main body portion 63 The front end surface is formed with a coupling hole (connected portion) 66' having a female thread portion 65 around the axis 〇, and a male screw portion 6.7 is formed at the front end of the shaft portion 64. The adapter 6 1 has a cylindrical portion 6 8 having an outer diameter slightly larger than that of the steel pipe 3; and a coupling portion 6 which is provided on the front end side of the cylindrical portion 68 and which can be fitted into the inner peripheral surface of the steel pipe 13 9; and a hole portion 70 provided in the proximal end side of the cylindrical portion 68 for inserting the shaft portion 64 of the adjustment rod 60. Further, in the cylindrical portion 68, a discharge port 72 through which the inside of the steel pipe 3 can be cut and discharged to the outside is formed. Will drill rod 1 2 and steel. The pipe 13 is coupled to the driving device by first connecting the connecting hole 66 of the adjusting rod 60 to the connecting portion 4 2 of the drill rod 1 2, and then inserting the connecting portion 6 9 of the adaptor 6 1 into the steel pipe] 3, the base end faces of the steel pipes 1 3 - 35 - (32) (32) 1333522 are abutted against the front end faces of the cylindrical portions 68, and the shaft portion 6 4 of the adjustment rod 6 插入 is inserted into the adapter 6 1 The hole portion 7 〇. Then, the link slider 7 3 is inserted into the shaft portion 64 which protrudes more toward the base end side than the adapter 61, so that the link member 73 and the base portion 7 of the adapter 61 are abutted against each other. 'One end of the sleeve 174 is screwed to the male thread portion 67 of the shaft portion 64 so that the sleeve 74 abuts against the male thread portion 67 of the shaft portion 64, and the shaft 椁 75 of the drive device is coupled to the sleeve The other end of 74. When the drilling tool 1 of the above-described structure is used for the drilling operation, the driving force of the peripheral force of the axis 〇, the thrust force of the axis 〇 direction, and the striking force applied as necessary, etc., will be driven from the shaft. 7 5 is transmitted via sleeve 74 to adapter 61 and adjustment rod 60 and is communicated to steel tube 13 and drill rod 12, respectively. Further, in the driving force transmitted from the drill rod 12 to the auger bit 11, the rotational force of the periphery of the axis 0 is transmitted to the ring bit by the engagement of the rib portion 27 and the groove portion 55. 5 2, the propulsive force in the axial direction and the striking force are transmitted to the annular drill bit 52 by the abutment of the inclined surface 26 and the base end surface 54a. The driving force is conveyed in this manner, and the cutting head is drilled using the cutting edge portion 18 of the auger bit 11 and the drilling bit 58 of the ring bit 51. Further, the drip water supplied to the flow path 34 of the auger bit I 1 from the flow path 40 of the drill pipe 2 is ejected from the fluid supply ports 35 and 36. Since the drill cuttings generated by drilling the cutting ground are flowed on the 0 彳 main base side of the steel pipe 3, and discharged from the discharge port 72 of the joint 6]. In this boring operation, it is possible to use the discharge groove 1 of the rotary drill bit 1], the discharge groove 4 of the intermediate sleeve 1 4, and the drill rod! 2-36-(33) (33)1333522 The spiral blade portion 43 and the discharge groove 62 of the adjustment rod 60 agitate the drilling chips flowing in the inside of the steel pipe 3, and can be pushed toward the base end side The effect of the squeezing flow is so that the drilling chips inside the steel pipe 13 can be prevented from being piled up, and the drilling chips can be smoothly discharged. Thereby, the use amount of the drilling water can be reduced or the drilling operation can be smoothly performed even if the water is replaced by the air, and the looseness of the ground due to the drilling water can be suppressed. In the state in which the drill rod 1 2 is coupled to the auger bit U, the dimension L in the axial direction of the coupling portion 42 located outside the coupling hole 30 is set to the inner diameter D of the steel pipe 13. 1 . Five times or less, it is possible to suppress a decrease in the discharge efficiency of the drill cuttings. In other words, since the spiral blade portion 43 is not provided in the joint portion 42, the effect of stirring the drill chip is not obtained, but L1 is set to 1 of the inner diameter D of the steel pipe 13. Since it is 5 times or less, it is possible to suppress the accumulation of the drilled chips on the joint portion 42, and the drill cuttings can be smoothly discharged. Further, the fluid supply port 35 is provided so as to be opened obliquely to the base end surface 16a in the direction of the base end. Therefore, the drilling water discharged from the fluid supply port 35 is ejected toward the base end direction, and the drill cuttings can be obtained. The end side pushes the effect of the flush. Since the amount of drilling water sprayed toward the drilling portion can be suppressed, the adverse effect of the drilling water on the ground can be suppressed. Next, a drilling tool 10A according to a second embodiment of the present invention will be described with reference to Fig. 9. The drilling tool 10A is different from the drill collar tool of the first embodiment in that a stabilizer 80 is installed between the auger bit and the drill rod 2, and the driving force in the axial direction is provided. It is conveyed from the spiral -37- (34) (34)1333522 drill bit 1 1 to the steel pipe]3. The same components as those of the drilling tool 10 are denoted by the same reference numerals, and detailed description thereof will be omitted. The stabilizing portion 80 has a main body portion 8 having an outer diameter slidably contacting the inner surface of the steel pipe 103, and a connecting portion 8 2 provided on the front end side of the main body portion 81, and forming a flow path along the axis 〇 8 3. Further, a male screw portion 8 4 ' that is screwed to the female screw portion 33 of the auger bit 11 is formed at the distal end portion of the coupling portion 8 2, and a curved surface which is continuously expanded toward the proximal end side is formed on the proximal end side. The inclined surface 85 is inclined, and the angle Θ of the tangent of the inclined surface 85 with respect to the axis 〇 is set to 45 ° or less. Further, the outer peripheral surface of the main body portion 8 is formed with a spiral discharge groove 8.6 that is twisted in the same direction as the discharge groove 16 of the auger bit 1 1 in which the base end surface 8 7 is bored with an axis. 0 is the center 'and has a coupling hole (connected portion) 8 9 of the female screw portion 8 8 . Further, the discharge groove 86 is formed such that the guide angle is 45. ~7 5. The range of the groove is more than 5 in m. Further, in the state in which the stabilizer 80 is coupled to the auger η, that is, the state in which the female screw portion 3 3 and the male screw portion 8 4 are screwed together and the connecting portion 8 2 is coupled to the coupling hole 30 is described. Next, the connecting portion 8 2 is formed by setting the outer diameter D of the connecting portion 8 2 outside the connecting hole 3 尺寸 in the axial direction L 2 of the outer diameter D of the horse tube 3 . Further, in a state where the connecting portion 4 2 of the drill rod 1 2 is coupled to the connecting hole 8 9 of the stabilizer 80, the dimension L1 in the axial direction of the connecting portion 42 located outside the connecting hole 8 is also set. The inner diameter of the steel pipe 13 is 1. Less than 5 times. Moreover, the structure of the drilling tool] Ο 是 is such that the inclined surface of the auger bit 1 - 38 - (35) 1333522 2 5 and the base end face of the sleeve head 48 5 〇 & (please refer to Fig. 7) The driving force from the 'axis axis direction is transmitted from the inclined surface 25 to the twin plane 5 〇 3 'the steel pipe 13 is inserted into the drilling hole. With this versatile driving force, the base end side of the drilling tool 〇 a does not have to be fitted with a positive 6 ] 'adjustment lever 60 and the like, so that the drill rod 2 can be coupled to the drive assembly 75. Further, by means of the drilling tool in this way, the end side conveys the driving force like the traction steel tube 3, and the stabilizer 80 is installed to ensure the straightness of the drilling operation.锺 锺 锺 锺 〇 〇 〇 〇 〇 〇 〇 〇 〇 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定 稳定Drill out. Further, in the connected state, the dimension L2 in the direction of the axis 0 of the outer portion 82 of the coupling hole 30 is set as the steel pipe 13 D]. When the connection portion 8 2 cannot obtain the disk waste or push the drill chip to the proximal end side, the discharge efficiency can be suppressed from being lowered. Further, since the angle Θ of the inclined surface 8 5 is set to 45. In the following, it is possible to suppress a decrease in discharge efficiency due to the inclination of the chisel shoulder. Since the drilling tool i〇A equipped with the stabilizer 80 is used, the drilling chips are piled up inside the steel pipe 13, and the drilling operation is smoothly performed. Next, the reamer bit of the first modification of the tool body will be described. And the reaming drill 90a of the second modification. Further, the same reference numerals are attached to the portions of the above-described embodiment, and the detailed vibration is omitted as shown in the first drawing. The reaming drill 90 has a diameter of expansion and abutment to reach the basic type to transfer the transfer. Under the axis] Ο A, in order to form the screw chisel, the connecting inner diameter of the chip row is agitated and drilled for the shaft surface 8 5 , that is, it will not be the same as the 90. The function of the -39- (36) (36)1333522 boring bit is equipped with: can be installed in the drill rod]. The columnar member portion 9 of the second member is formed by a drill bit 9 2 installed at two places at the front end of the columnar member portion 91. The columnar member portion 91 is a substantially columnar member centered on the axis 0, and the base end face 9 is provided with a coupling hole 93 for arranging the drill rod 12 centered on the axis axis. On the front end face 91b, two support holes 94 for rotatably supporting the drill bit 92 are provided centering on two positions offset from the axis 0. The female screw portion 95 is formed on the inner peripheral surface 93a of the connecting hole 93, and the bottom surface 93b of the connecting hole 93 is formed with a flow path 96 having a predetermined depth centering on the axis 0. The outer circumference ' of the columnar member portion 9 1 is formed with a spiral discharge groove 97 from the distal end surface 9 1 b toward the proximal end side in a left-handed manner, and an opening communicating with the flow path 96 is formed in the discharge groove. The fluid supply ports 9 8 and 9 9 of the groove bottom surface 97a of 97. The fluid supply port 98 is provided so as to be inclined from the flow path 2 1 to the discharge groove 179 and from the front end side toward the base end side with respect to the axis 〇, and toward the base end direction, opening to the groove bottom surface 197 a, the fluid supply The port 9 9 is oriented toward the front end and opens to the bottom surface 97a of the groove. Further, the outer peripheral portion of the discharge groove 2 2 is not formed in the columnar member portion 9 1 , and the inclined surface 100 toward the distal end side is formed. Further, the drill bit 9 2 includes a head portion 102 that is implanted with a plurality of drilling heads, and a shaft portion 1 〇3 that faces the base end side of the head portion 102, and the shaft portion 1 0 3 is The columnar member portion 9 1 is attached so as to be rotatable about the central axis 02 of the support hole 94 so as to be inserted into the support hole 94 and locked in the axial direction. The drilling head 1 01 is a claw-shaped cutting edge in which a tip end portion of a slightly conical shape is formed with an inclined surface, and is implanted on the front end of the head 40 - (37) (37) 13332522 of the head portion 102. And the front end ridge portion formed by the inclined surface extends radially. When the head portion 1 0 2 is viewed from the front end, the system has a slightly semicircular shape. When the drilling is performed, as shown in Fig. 10 (a), the positional relationship between the head and the 〇2 is changed. Reaming status. Further, when the reamer bit 9 turns in the opposite direction to the rotational direction T, the fulcrum bit 9 is rotated about the central axis 〇 2, whereby the arc surface of the head 1 〇 2 alternately can be used. A reduced diameter state of a slightly circular shape is formed, and the steel pipe 13 is passed. Further, as shown in Fig. 1], the 'reamering drill bit 90 a has the function of expanding/reducing the diameter similarly to the reaming bit 90, and the head 1 0 2 a of the bit 9 2 a is the reaming bit 9 The shape of the head 1 0 2 of 0 is different. Further, the structural portions that are common to the reaming drill bit 90 are denoted by the same reference numerals, and detailed description thereof will be omitted. A plurality of drilling heads 104 having a V-shaped cutting edge projecting in the front end direction and the rotation direction T are implanted in the head 102a, and a groove portion 1 is formed between each of the drilling heads 104. 05. In the first modification, the sleeve head 48 8 is attached to the front end of the steel pipe 13 by the base end surface of the sleeve head 48 a and the inclined surface 1 of the reaming bit 90 Then, the driving force in the direction of the axis 0 is transmitted from the reaming drill bit 90 to the steel pipe 13. The driving force amount in the axial direction is transmitted from the reamer 90a to the steel pipe 13 by the abutment of the base end face of the sleeve head 48 a and the inclined surface 100 of the reaming bit 90 a. Further, the second modification (Fig. 1) is an embodiment in which a so-called "cutting type reamer" is used. Drilling tools, although generally using rotation and blow to drill holes, but for the very weak layer of clay -41 - (38) (38)1333522, the formation of the site to enhance the rotation of the cutting method Drilling, the efficiency of which will be better than drilling in the way of drilling, so this "cutting type reaming drill" can be more effective. In the outer periphery of the columnar member portion 9 1 of the reamer drills 90 and 90a having the function of expanding/reducing the diameter, a spiral discharge groove 9 7 is formed, so that the discharge groove 9 7 can be used to stir the drill cuttings. Further, it is possible to obtain an effect of pushing it toward the proximal end side, so that the drill cuttings can be smoothly discharged. Further, in the present embodiment, the discharge groove 6 of the auger bit 1 1 , the spiral blade portion 43 of the drill rod 1 2 , the discharge groove 47 of the intermediate sleeve 4 , and the discharge groove 86 of the stabilizer 80 are guided. Although the angles are respectively split into different angles 'but it would be better if they could form these angles at roughly the same angle. Further, the cutting edge portion of the auger bit 1 1 and the drilling head attached to the apex portion 2 can be subjected to wear-resistant treatment. In addition, a sleeve made of other materials may be used instead of the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front end portion of a drilling tool according to a first embodiment of the first embodiment of the present invention, (a) is a front end view of the drilling tool; (b) is a side view of a partial section Figure. Fig. 2 is a cross-sectional view of a steel pipe in the vicinity of a sieve hole. Fig. 3(a) is a cross-sectional view of the pressure valve; (b) is a front view of the pressure valve. Fig. 4 is a view showing the overall configuration of a drilling tool according to a second embodiment of the first embodiment of the present invention. -42- (39) 1333522 Figure 5 is an explanatory diagram of the steel pipe first supporting method. Fig. 6 is a view showing the entire configuration of an apparatus according to a first embodiment of the second embodiment of the present invention. Figure 7 is a front view showing the front end of the drilling tool, (a) is a front end view of the tool; and (b) is a side view of a partial section. Figure 8 is a perspective view of the tool body. Fig. 9 is a view showing the overall configuration of a second embodiment of the second embodiment of the present invention. The first diagram is a first modification showing the tool body, (a) a front end view of the tool; (b) is a partial sectional view of the drill collar tool, and the section is the A - 0 in the first diagram (a) - A 'section view of the section. Fig. 1 is a second modification showing the tool body, (a) a front end view of the tool; (b) is a partial sectional view of the drilling tool, and the section is the A - 0 in Fig. 1 (a) - A section view of A 5 . [Description of main component symbols] 〇9: Body member 10: Drilling tool 1 1 : Tool body 1 2 : Drill rod 1 3 : Steel pipe 1 4 : Intermediate sleeve 锧 chisel drill chisel is drilled The side line is cut along the side line of the drill collar. -43 - (40) (40)1333522 1 5 : Front end 1 6 , 4 7 , 8 6 : Drainage groove 6 a : Ditch bottom surface 1 6 b : Ditch side 1 7 : notch portion 1 7 a : cutting edge side 1 8 : cutting edge portion 2 1 ' 3 4 : flow path 2 4, 6 2 : fluid supply port 3 0, 4 6 , S 9 : connection hole (connected portion) 3 5, 3 6 : Fluid supply port 5 1 a : Inclined surface 5 6 : Drilling head (cutting edge) 8 2, 4 2 : Connecting portion 4 3 : Spiral blade portion 5 〇: Screen hole 5 1 : Pressure Valve 5 4 : film portion 6 1 : air supply port 6 4 : air flow path 74 : sleeve 8 0 : stabilizer 8 5 : inclined surface 〇: axis - 44 - 1333522 (41) L], L2 : joint portion Size T: direction of rotation