JPH0416618A - Temporary steel material drawing method - Google Patents
Temporary steel material drawing methodInfo
- Publication number
- JPH0416618A JPH0416618A JP11861090A JP11861090A JPH0416618A JP H0416618 A JPH0416618 A JP H0416618A JP 11861090 A JP11861090 A JP 11861090A JP 11861090 A JP11861090 A JP 11861090A JP H0416618 A JPH0416618 A JP H0416618A
- Authority
- JP
- Japan
- Prior art keywords
- acrylic resin
- steel material
- mortar
- cement
- hardening liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 57
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 239000000463 material Substances 0.000 title claims description 46
- 238000000034 method Methods 0.000 title claims description 18
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 22
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 17
- 229920005792 styrene-acrylic resin Polymers 0.000 claims abstract description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000839 emulsion Substances 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 abstract description 21
- 239000011083 cement mortar Substances 0.000 abstract description 12
- 239000007864 aqueous solution Substances 0.000 abstract description 11
- 239000004570 mortar (masonry) Substances 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 230000007928 solubilization Effects 0.000 description 7
- 238000005063 solubilization Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 125000005620 boronic acid group Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は仮設鋼材、とりわけ、セメント系自硬化液の硬
化物中に埋設された仮設鋼材の引き抜き方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to temporary steel materials, and particularly to a method for pulling out temporary steel materials buried in a hardened product of a cement-based self-hardening liquid.
（従来の技術）
この種の仮設鋼材の引き抜き方法としては、例えば、特
公昭６１−３２４５２号公報に開示されている。(Prior Art) A method for drawing out temporary steel materials of this type is disclosed, for example, in Japanese Patent Publication No. 32452/1983.
ところで、従来、土留め又は遮水用として地下にセメン
トモルタル等のセメント糸目硬化液硬化物の仮設杭を打
設形成した場合、爾後、この杭の中に挿入したＨ鋼とか
■鋼等の鋼材は、地下１１４造物の構築完了後に引き抜
くようになっている。By the way, conventionally, when temporary piles of cement thread hardened liquid such as cement mortar are driven underground for earth retaining or water shielding, steel materials such as H steel or ■ steel inserted into the piles. It is designed to be pulled out after the construction of 114 underground structures is completed.
従って、前記鋼材の引き抜きを容易にするたぬ、この鋼
材の表面に予め剥離剤を塗布した後、杭を形成しようと
するセメント系自硬化液中に鋼材を挿入するようにして
いた。Therefore, in order to make the steel material easier to pull out, a release agent is applied to the surface of the steel material in advance, and then the steel material is inserted into the cement-based self-hardening liquid from which the pile is to be formed.
前記剥離剤としては、一般にグリース、パラフィンとか
発泡樹脂等か用いられ、また、前記特公昭６１−３２４
５２号公報ではアルカリ劣化性樹脂を用いる二とが提案
されている。As the release agent, grease, paraffin, foamed resin, etc. are generally used.
No. 52 proposes a method using an alkali-degradable resin.
（発明か解決しようとする課題）
しかしなから、かかる従来の仮設鋼材の引き抜き方法で
は、剥離剤の効果が未だ十分ではなく、次に挙げる課題
があった。(Problems to be Solved by the Invention) However, in this conventional method for drawing out temporary steel materials, the effect of the release agent is not yet sufficient, and the following problems arise.
すなわち、まず、セメント系自硬化液に挿入する段階は
、鋼材に塗着された剥離剤が剥がれ易く、このように剥
離剤が剥がれた場合は、セメント系自硬化液が直接鋼材
に接触して固化されるため、引き抜き時には過大な抵抗
が発生する。In other words, first, the release agent applied to the steel material easily peels off during the step of inserting it into the cement-based self-hardening liquid, and if the release agent peels off like this, the cement-based self-hardening liquid may come into direct contact with the steel material. Because it solidifies, excessive resistance occurs when it is pulled out.
また、グリース、パラフィン、発砲樹脂等の剥離剤にあ
っては、時間の経過に従って引き抜き抵抗が増大し、ま
た、アルカリ劣化性樹脂では、りき抜き抵抗を徐々に減
少できるが、その抵抗減少量は十分なものではなかった
。In addition, with release agents such as grease, paraffin, and foamed resin, the pull-out resistance increases over time, and with alkali-degradable resins, the pull-out resistance can be gradually reduced, but the amount of resistance decrease is It wasn't good enough.
さらに、このような従来の方法では引き抜き抵抗が大き
いことから、引き抜き設備を大幅に小規模化するには不
十分である。Furthermore, such conventional methods are insufficient for significantly reducing the size of the drawing equipment because of their large drawing resistance.
そこで、本発明は係る従来の課題に鑑みて、鋼材をセメ
ント系自硬化液に挿入する段階で強固な塗膜を維持する
と共に、引き抜き時の抵抗力を著しく低下させ、しかも
低減された引き抜き力を長期に亙って維持できる仮設鋼
材の引き抜き方法を提供することを目的とする。Therefore, in view of the conventional problems, the present invention maintains a strong coating film at the stage of inserting the steel material into a cement-based self-hardening liquid, significantly reduces the resistance force during pulling out, and further reduces the pulling force. The purpose of the present invention is to provide a method for pulling out temporary steel materials that can be maintained for a long period of time.
（課題を解決するための手段）
かかる目的を達成するために本発明は、セメント系自硬
化液の中に仮設鋼材を挿入し、該セメント系自硬化液の
硬化後に引き抜く方法において、前記仮設鋼材は、前記
セメント系自硬化液中に挿入する前に、少くとも該仮設
鋼材が前記セメント系自硬化液に挿入される部分の表面
にアクリル樹脂を塗布する工程を有し、前記アクリル樹
脂は、アルカリに溶解する酸価を有し、酸価の異なるア
クリルエマルジョンとスチレンアクリル樹脂水溶液とを
所定割合で混合したものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for inserting a temporary steel material into a cementitious self-hardening liquid and pulling it out after the cementitious self-hardening liquid hardens. has the step of applying an acrylic resin to at least the surface of the portion of the temporary steel material to be inserted into the cement-based self-hardening liquid before inserting it into the cement-based self-hardening liquid, and the acrylic resin comprises: It has an acid value that dissolves in alkali, and is a mixture of an acrylic emulsion and an aqueous styrene-acrylic resin solution having different acid values in a predetermined ratio.
（作用）
以上の構成により本発明の仮設鋼材の引き抜き方法にあ
っては、少なくともアクリルエマルジョンとスチレンア
クリル樹脂水溶液との混合により得られるアクリル樹脂
を剥離剤として用いているので、鋼材をセメント系自硬
化液に挿入する以前では、アクリル樹脂のアンモニアが
水とともに揮発して、剥離剤は水に不溶となり、鋼材の
表面には強固な塗膜が形成される。(Function) With the above-described structure, the method for pulling out temporary steel materials of the present invention uses at least an acrylic resin obtained by mixing an acrylic emulsion and a styrene-acrylic resin aqueous solution as a release agent. Before being inserted into the hardening solution, the ammonia in the acrylic resin evaporates together with water, making the release agent insoluble in water and forming a strong coating film on the surface of the steel material.
従って、鋼材をセメント系自硬化液に挿入する段階で剥
離剤が剥がれ落ちるのが防止される。Therefore, the release agent is prevented from peeling off at the stage of inserting the steel material into the cement-based self-hardening liquid.
一方、鋼材をセメント系自硬化液中に挿入した後は、前
記塗膜がセメント系自硬化液中の水酸化カルシウム水溶
液のアルカリによって可溶化される。On the other hand, after the steel material is inserted into the cement-based self-hardening liquid, the coating film is solubilized by the alkali of the calcium hydroxide aqueous solution in the cement-based self-hardening liquid.
従って、鋼材とセメント系自硬化液の硬化物との間には
可溶化された剥離層が設けられ、硬化されたセメント系
自硬化液から鋼材を引き抜く時の抵抗力が著しく低減さ
れる。Therefore, a solubilized peeling layer is provided between the steel material and the hardened product of the cementitious self-hardening liquid, and the resistance force when the steel material is pulled out from the hardened cementitious self-hardening liquid is significantly reduced.
また、前記剥離剤としたアクリル樹脂は、少なくとも酸
価の異なるアクリルエマルジョンとスチレンアクリル樹
脂水溶液とが混合されたものであるため、可溶化の進行
を酸価の違いによりそれぞれの成分で異ならせることか
でき、これにより引き抜き力の低減効果が長時間に亙っ
て継続される。Furthermore, since the acrylic resin used as the release agent is a mixture of at least an acrylic emulsion and an aqueous styrene acrylic resin solution with different acid values, the progress of solubilization can be made to differ for each component depending on the difference in acid value. As a result, the effect of reducing the pulling force continues for a long time.
（実施例） 以下本発明の実施例を図に基づいて詳細に説明する。(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.
即ち、第１図から第４図は本発明を柱列式地下連続壁工
法に適用した場合を示し、第１図に示すように、まず、
地盤１０に縦孔１２を掘り、この中にセメント系自硬化
液、例えばセメントモルタルユ４を注入する。That is, FIGS. 1 to 4 show the case where the present invention is applied to the column type underground continuous wall construction method, and as shown in FIG.
A vertical hole 12 is dug in the ground 10, and a cement-based self-hardening liquid, such as a cement mortar 4, is poured into the hole.
そして、前記セメントモルタル１４か硬化しないうちに
、第２図に示すように芯材となる鋼材］６（本実施例で
はＨ型鋼を用いる。）を、第３図の状態となるようにセ
メントモルタル１４中に挿入し、セメントモルタル１４
が硬化されることによりモルタル杭１８として機能する
。Then, before the cement mortar 14 has hardened, as shown in FIG. 2, the steel material 6 (in this example, H-shaped steel is used) as the core material is placed in the cement mortar so that it becomes the state shown in FIG. 3. 14 and cement mortar 14
When it is hardened, it functions as a mortar pile 18.
この場合、前記モルタル杭１８は第５図に示すように、
縦杭２０を掘削しようとする周りに連続して設け、これ
らモルタル杭１８の内方を腹起し２２および切梁２４で
補強しつつ掘り進められる。In this case, the mortar pile 18, as shown in FIG.
Vertical piles 20 are continuously provided around the area to be excavated, and the inside of these mortar piles 18 is reinforced with uprights 22 and struts 24 as the excavation progresses.
そして、所定深さまで掘進められた前記縦杭２０内に目
的の構造物が構築されるが、この構造物が完成した後、
第４図に示したように引き抜き装置２６を用いて前記モ
ルタル杭１８から鋼材１６を引き抜き、モルタル部分の
みを地中に残す。Then, a target structure is constructed within the vertical pile 20 that has been dug to a predetermined depth, but after this structure is completed,
As shown in FIG. 4, the steel material 16 is pulled out from the mortar pile 18 using a pulling device 26, leaving only the mortar portion underground.
ところで、この実施例では、前記第２図に示すように鋼
材１６をセメントモルタル１４内に挿入する以前に、こ
の鋼材１６にはセメントモルタル１４に埋設される部分
の表面に剥離剤２８を塗布（第６図参照）する工程が施
される。By the way, in this embodiment, before inserting the steel material 16 into the cement mortar 14 as shown in FIG. (see FIG. 6) is performed.
前記剥離剤２８としては、酸価の高いアクリル樹脂が用
いられ、このアクリル樹脂のアルカリ可溶性が利用され
る。As the release agent 28, an acrylic resin with a high acid value is used, and the alkali solubility of this acrylic resin is utilized.
前記アクリル樹脂の酸価は、１００〜２００の範囲が望
ましく、例えば、アクリルエマルジョン（酸価１００）
の１００重量部に対して、スチレンアクリル樹脂水溶液
（酸価２００）の１００重量部を配合したものが用いら
れる。The acid value of the acrylic resin is preferably in the range of 100 to 200, for example, acrylic emulsion (acid value 100)
A mixture of 100 parts by weight of styrene acrylic resin aqueous solution (acid value 200) is used.
尚、前記スチレンアクリル樹脂水溶液の配合は、■スチ
レンアクリル樹脂フレーク ３４．０重量部■２５％ア
ンモニア ８．１重量部■イソプロピル
アルコール ３．０重量部■プロピレングリコ
ール １．５重量部■ 水
５３．４重量部となっている。The composition of the styrene acrylic resin aqueous solution is: ■ Styrene acrylic resin flakes 34.0 parts by weight ■ 25% ammonia 8.1 parts by weight ■ Isopropyl alcohol 3.0 parts by weight ■ Propylene glycol 1.5 parts by weight ■ Water
It is 53.4 parts by weight.
即ち、前記アクリル樹脂の配合例は、アルカリ可溶性の
フレーク状スチレンアクリル樹脂中のカルボキシル基を
アンモニアで中和することにより水溶性塩とし、これに
造膜性を上げるためにアルカリ可溶性のアクリルエマル
ジョン（酸価１００）を配合したものである。That is, in the formulation example of the acrylic resin, the carboxyl groups in the alkali-soluble flaky styrene acrylic resin are neutralized with ammonia to form a water-soluble salt, and then an alkali-soluble acrylic emulsion ( (acid value: 100).
また、前記配合例のアクリル樹脂には、増量とか垂れ防
止のために炭酸カルシウム、タルク、シリカ粉および消
泡剤等を添加することが望ましい。Further, it is desirable to add calcium carbonate, talc, silica powder, an antifoaming agent, etc. to the acrylic resin in the above formulation example in order to increase the amount and prevent sagging.
ところで、前記配合のアクリル樹脂塗膜の塗装方法は、
ハケ塗り、吹き付は又はローラー塗りのいずれでも良く
、塗膜の厚さは１〜２１が好ましい。By the way, the method for coating the acrylic resin coating film with the above formulation is as follows:
Brush coating, spraying, or roller coating may be used, and the thickness of the coating film is preferably 1 to 21 mm.
本実施例では、以上の配合により得られるアクリル樹脂
による剥離剤２８を鋼材１６の表面に塗布することによ
り、水とともにアンモニアが揮発してアクリル樹脂は水
に不溶となり、鋼材１６をセメントモルタル１４の中に
挿入する以前では、強固な塗膜か維持される。In this example, by applying the release agent 28 made of acrylic resin obtained by the above-mentioned composition to the surface of the steel material 16, ammonia is volatilized together with water, and the acrylic resin becomes insoluble in water. Before it is inserted inside, a strong coating is maintained.
従って、前記鋼材１６をセメントモルタル１４の中に挿
入する際に、前記剥離剤２８が剥がれ落ちることが防止
される。Therefore, when the steel material 16 is inserted into the cement mortar 14, the release agent 28 is prevented from peeling off.
次に、前記剥離剤２８を塗布した鋼材１６かセメントモ
ルタル１４の中に挿入された後は、剥離剤２８がこのセ
メントモルタル１４に接すると、セメント中の水酸化カ
ルシウム水溶液のアルカリによって可溶化する。Next, after the steel material 16 coated with the release agent 28 is inserted into the cement mortar 14, when the release agent 28 comes into contact with the cement mortar 14, it is solubilized by the alkali of the calcium hydroxide aqueous solution in the cement. .
従って、鋼材１６とセメントモルタル１４との間に可溶
化された剥離層が形成され、鋼材］５の引き抜き抵抗を
著しく低減し、引き抜き力を大幅に減少することができ
る。Therefore, a solubilized peeling layer is formed between the steel material 16 and the cement mortar 14, which significantly reduces the pull-out resistance of the steel material 5 and the pull-out force.
また、本実施例の剥離剤として用いられるアクリル樹脂
は、酸価値の異なるアクリルエマルションとスチレンア
クリル樹脂水溶液とを混合したものであるため、可溶化
の進行をそれぞれの成分て異ならせることができる。In addition, since the acrylic resin used as the release agent in this example is a mixture of an acrylic emulsion and an aqueous styrene acrylic resin solution having different acid values, the progress of solubilization can be made different for each component.
つまり、前記可溶化の進行は、まず、酸価値が２００と
大きなスチレンアクリル樹脂水溶液の可溶化か進み、次
第に酸価値か１００と小さなアクリルエマルジョンの可
溶化に移行していくため、可溶化された剥離層は長期に
亙って存在することになる。In other words, the progress of solubilization is as follows: First, the solubilization of the styrene-acrylic resin aqueous solution with a high acid value of 200 progresses, and then gradually the solubilization progresses to the solubilization of the acrylic emulsion with a low acid value of 100. The release layer will exist for a long time.
従って、時間の経過と共に引き抜き力が増大されること
はなく、引き抜き力の低減効果が長時間に亙って継続さ
れる。Therefore, the pull-out force does not increase over time, and the effect of reducing the pull-out force continues for a long time.
次に示す第１表は、本実施例による引き抜き方法と、従
来（特公昭６１−３２４５２号公報）の引き抜き方法と
、無処理（剥離剤の塗布なし）で鋼材を引き抜いた場合
とをそれぞれ示す試験結果で、試験番号１〜４は本実施
例による場合、試験番号５．６は従来の場合、試験番号
７は無処理の場合である。Table 1 below shows the drawing method according to this embodiment, the conventional drawing method (Japanese Patent Publication No. 61-32452), and the case where steel material is drawn without treatment (no application of release agent). In the test results, test numbers 1 to 4 are based on this example, test number 5.6 is the conventional case, and test number 7 is the case without treatment.
尚、前記第１表の試験結果は、フランジ寸法３Ｑｃｍ、
長さ１５ｍのＨ型鋼を鋼材１６として用いたモルタル抗
１８について行った結果である。Note that the test results in Table 1 above are based on flange dimensions of 3Qcm,
These are the results obtained for a mortar counter 18 using a 15 m long H-shaped steel as the steel material 16.
また、前記表中試験番号２と４は、材令３日で油圧ジヤ
ツキにて縁切りした場合である。In addition, test numbers 2 and 4 in the table above are cases in which edges were cut using a hydraulic jack when the material was 3 days old.
即ち、前記第１表の試験番号１〜４に示す剥離剤として
の被膜組成物は、スチレンアクリル樹脂水溶液とアクリ
ルエマルジョンおよび炭酸カルシウムとを配合したもの
で、これらの配合比は重量比をもって表中に示す。That is, the coating compositions as release agents shown in test numbers 1 to 4 in Table 1 above are mixtures of styrene-acrylic resin aqueous solutions, acrylic emulsions, and calcium carbonate, and the blending ratios of these are as shown in the table by weight ratio. Shown below.
このように、前記試験結果から明らかなように、本実施
例の引き抜き方法では試験番号７の無処理に比較して引
き抜き抵抗が著しく低減されるのは勿論のこと、試験番
号５．６の引き抜き方法と比較しても、顕著な低減効果
を発揮することかできる。As described above, as is clear from the above test results, the pulling method of this example significantly reduces the pulling resistance compared to the no treatment in test number 7, as well as the pulling resistance in test number 5.6. Even when compared with other methods, it is possible to demonstrate a remarkable reduction effect.
また、本実施例の引き抜き方法では時間の経過によって
も、引き抜き抵抗を小さくした状態を維持することがで
き、縦杭２０内に構築される構造物の完了期間が長期化
した場合にも、鋼材］６の引き抜きを容易に行うことが
できる。In addition, with the pulling method of this embodiment, it is possible to maintain a state in which the pulling resistance is reduced over time, and even if the completion period of the structure built inside the vertical pile 20 is prolonged, the steel material ] 6 can be easily pulled out.
従って、前記鋼材１６を引き抜くための引き抜き装置２
６（第４図参照）を、より小型化することができる。Therefore, the pulling device 2 for pulling out the steel material 16
6 (see FIG. 4) can be made more compact.
（発明の効果）
以上説明したように本発明の仮設鋼材の引き抜き方法で
は、仮設鋼材がセメント系自硬化液に挿入される部分の
表面に塗布されるアクリル樹脂を、少なくとも酸価の異
なるアクリルエマルジョンとスチレンアクリル樹脂水溶
液とを所定割合をもって混合したので、鋼材をセメント
系自硬化液に挿入する以前では、アクリル樹脂のアンモ
ニアが水といっしょに揮発して強固な塗膜が得られ、鋼
材をセメント系自硬化液に挿入する段階でこの塗膜が剥
がれ落ちるのを防止することができる。(Effects of the Invention) As explained above, in the method for pulling out temporary steel materials of the present invention, the acrylic resin applied to the surface of the portion of the temporary steel material to be inserted into the cement-based self-hardening liquid is at least an acrylic emulsion having a different acid value. and a styrene-acrylic resin aqueous solution in a predetermined ratio, the ammonia in the acrylic resin volatilizes with water and a strong coating film is obtained before the steel material is inserted into the cement-based self-hardening solution. This coating can be prevented from peeling off at the stage of insertion into the self-curing solution.
また、鋼材をセメント系自硬化液中に挿入した後は、前
記塗膜がセメント系自硬化液中の水酸化カルシウム水溶
液のアルカリによって可溶化されるので、硬化したセメ
ント系自硬化液から鋼材を引き抜く時の抵抗力を著しく
低減できる。Furthermore, after the steel material is inserted into the cement-based self-hardening liquid, the coating film is solubilized by the alkali of the calcium hydroxide aqueous solution in the cement-based self-hardening liquid, so the steel material is removed from the hardened cement-based self-hardening liquid. The resistance force when pulling out can be significantly reduced.
更に、前記鋼材に塗布されるアクリル樹脂は、少なくと
も酸硼の異なるアクリルエマルジョンとスチレンアクリ
ル樹脂水溶液とが配合されたものであるため、可溶化の
進行をそれぞれの成分で異ならせて、引き抜き力の低減
効果を長時間に亙って継続することができる。Furthermore, since the acrylic resin applied to the steel material is a mixture of at least an acrylic emulsion containing different boronic acids and an aqueous styrene acrylic resin solution, the progress of solubilization is made different for each component to increase the pulling force. The reduction effect can be maintained for a long time.
従って、このように本発明では引き抜き力の大幅な低減
を行うことができるため、前記鋼材の弓き抜き装置を大
幅に小型化することができるという各種優れた効果を奏
する。Therefore, in the present invention, since the pulling force can be significantly reduced, various excellent effects such as the ability to significantly reduce the size of the bow punching apparatus for steel materials are achieved.
第１図から第４図は本発明の仮設鋼材の引き抜き方法に
おいて鋼材の埋設から引き抜きまでを段階を追って示す
説明図、第５図は本発明にかかる仮設鋼材を用いた杭の
配列状態を示す平面図、第６図は第３図中のＶｌ−Ｖｌ
線からの拡大断面図である。
１６・・・鋼材 １８・・・モルタル杭２０
・・・縦杭 ２６・・・引き抜き装置２８・
・・剥離剤（アクリル樹脂）Figures 1 to 4 are explanatory views showing step by step the process from burying steel to pulling it out in the method of pulling out temporary steel according to the present invention, and Figure 5 shows how piles are arranged using the temporary steel according to the present invention. The plan view, Fig. 6, is Vl-Vl in Fig. 3.
It is an enlarged sectional view taken from the line. 16... Steel material 18... Mortar pile 20
...Vertical pile 26... Pulling device 28.
・・Removal agent (acrylic resin)
Claims (1)
ト系自硬化液の硬化後に引き抜く方法において、 前記仮設鋼材は、前記セメント系自硬化液中に挿入する
前に、少くとも該仮設鋼材が前記セメント系自硬化液に
挿入される部分の表面にアクリル樹脂を塗布する工程を
有し、 前記アクリル樹脂は、アルカリに溶解する酸価を有し、
酸価の異なるアクリルエマルジョンとスチレンアクリル
樹脂水溶液とを所定割合で混合したものであることを特
徴とする仮設鋼材の引き抜き方法。[Claims] In a method of inserting a temporary steel material into a cementitious self-hardening liquid and pulling it out after the cementitious self-hardening liquid has hardened, the temporary steel material is inserted into the cementitious self-hardening liquid before being inserted into the cementitious self-hardening liquid. , comprising the step of applying an acrylic resin to at least the surface of the portion of the temporary steel material to be inserted into the cement self-hardening liquid, the acrylic resin having an acid value that dissolves in alkali,
A method for drawing temporary steel material, characterized in that it is a mixture of an acrylic emulsion having different acid values and an aqueous styrene acrylic resin solution at a predetermined ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2118610A JP2563142B2 (en) | 1990-05-10 | 1990-05-10 | How to pull out temporary steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2118610A JP2563142B2 (en) | 1990-05-10 | 1990-05-10 | How to pull out temporary steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0416618A true JPH0416618A (en) | 1992-01-21 |
| JP2563142B2 JP2563142B2 (en) | 1996-12-11 |
Family
ID=14740820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2118610A Expired - Lifetime JP2563142B2 (en) | 1990-05-10 | 1990-05-10 | How to pull out temporary steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2563142B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6030328A (en) * | 1994-12-12 | 2000-02-29 | Yamauchi Corporation | Resin roll for calendering magnetic recording medium and manufacturing method therefor |
-
1990
- 1990-05-10 JP JP2118610A patent/JP2563142B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6030328A (en) * | 1994-12-12 | 2000-02-29 | Yamauchi Corporation | Resin roll for calendering magnetic recording medium and manufacturing method therefor |
| US6319624B1 (en) | 1994-12-12 | 2001-11-20 | Yamauchi Corporation | Apparatus for calendering magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2563142B2 (en) | 1996-12-11 |
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