JP2004218375A

JP2004218375A - Joint structure of joist unit and beam, and connection structure of joist unit

Info

Publication number: JP2004218375A
Application number: JP2003009764A
Authority: JP
Inventors: Takuji Takeda; 拓司竹田; Keiji Nakanishi; 啓二中西; Akira Kikuchi; 昭菊地; Kazuhiko Kobayashi; 和彦小林; Takashi Tsujii; 孝辻井; Takeshi Sekiguchi; 猛関口
Original assignee: Shimizu Construction Co Ltd; Shimizu Corp
Current assignee: Shimizu Construction Co Ltd; Shimizu Corp
Priority date: 2003-01-17
Filing date: 2003-01-17
Publication date: 2004-08-05
Anticipated expiration: 2023-01-17
Also published as: JP3956297B2

Abstract

【課題】本発明は、簡略な構成で施工性の良い根太ユニットと梁の接合構造、及び根太の連結構造を提供する。
【解決手段】根太ユニット２の根太連結材４には、根太ユニット２の幅方向に所定の離間間隔をもって第１の貫通孔４ａが対をなして設けられ、その上面には、第１の貫通孔４ａと鉛直状で同軸となる位置に、対をなして第２の貫通孔８ａが配された板座金８が配される。支圧接合手段５を構成するスタッドボルト６は、梁１の上フランジ１ａ上で、根太連結材４の第１の貫通孔４ａと鉛直方向で同軸となる位置に配される。スタッドボルト６が、根太連結材４の第１の貫通孔４ａ及び板座金８の第２の貫通孔８ａの両者に貫通された状態で、梁１の上フランジ１ａ、根太ユニット２の根太連結材４、及び板座金８の３者に鉛直方向の圧縮力が作用するように、スタッドボルト６にナット７を嵌合し、締結する。
【選択図】図１An object of the present invention is to provide a joint structure of a joist unit and a beam having a simple configuration and good workability, and a joint structure of the joist.
A pair of first through holes (4a) are provided in a joist connecting member (4) of a joist unit (2) at predetermined intervals in the width direction of the joist unit (2), and a first through hole (4) is formed on an upper surface thereof. A plate washer 8 having a pair of second through-holes 8a is arranged at a position where the second through-holes 8a are arranged in a vertical and coaxial manner with the hole 4a. The stud bolt 6 constituting the bearing joining means 5 is disposed on the upper flange 1 a of the beam 1 at a position which is coaxial in the vertical direction with the first through hole 4 a of the joist connecting member 4. In a state where the stud bolt 6 is penetrated through both the first through hole 4a of the joist connecting member 4 and the second through hole 8a of the plate washer 8, the upper flange 1a of the beam 1 and the joist connecting member of the joist unit 2 are used. The nut 7 is fitted and fastened to the stud bolt 6 so that a vertical compressive force acts on the four members 4 and the plate washer 8.
[Selection diagram] Fig. 1

Description

【０００１】
【発明の属する技術分野】
本発明は、クリーンルームの床に用いられる根太ユニットと梁の接合構造、及び根太の連結構造に関する。
【０００２】
【従来の技術】
従来より、特許文献１に示すように、クリーンルームの床に用いられる複数の根太を所定の離間間隔を持って平行に配置した上で、根太連結材を介して一体化した根太ユニットが考案されている。該根太ユニットは、根太の側部の所定位置にあらかじめ接合金物を埋め込んでおき、該接合金物を鉄骨造の梁に対して現場溶接あるいはボルト締結することにより、梁に接合するものである。
また、長さ方向に隣り合う根太の連結は、特許文献２に示すように、隣り合う根太の端部どうしが梁の上面で向かい合わされて、両者を現場打ちコンクリートにより締結するものである。
【０００３】
【特許文献１】
特開２００１−２４４５０９号公報
【特許文献２】
特開２００２−１１３８０８号公報
【０００４】
【発明が解決しようとする課題】
しかし、上述する根太ユニットと梁の接合構造は、根太に接合金物をあらかじめ埋設する構成であるため、根太ユニットの製作や塗装面の補修等が煩雑になりやすい。また、前記接合金物を梁に現場溶接すると、施工が煩雑になるとともに、品質の確保や火気使用に対する仮設養生等の課題が生じることとなる。
一方、長さ方向に隣り合う根太の連結構造は、現場打ちコンクリートによる剛接合であるため、施工手順にコンクリート打設が加わり、工期が延長するとともに、コスト高となりやすい。
【０００５】
上記事情に鑑み、本発明は、簡略な構成で施工性の良い根太ユニットと梁の接合構造、及び根太の連結構造を提供することを目的としている。
【０００６】
【課題を解決するための手段】
請求項１記載の根太ユニットと梁の接合構造は、通気用の開口部を有するクリーンルームの床に適用される根太ユニットと梁の接合構造であって、前記梁が、少なくとも上面に水平面を形成する上フランジを備えた型鋼よりなる鉄骨造に構成されるとともに、前記根太ユニットが、前記梁の上フランジの上面で、梁と直交するように所定の間隔をもって離間配置される複数の根太と、該根太に直交するとともに、下端面が根太の下端面と同一水平面を形成し、少なくとも根太の両端部、及び前記梁と同様の離間間隔位置に複数配され、隣り合う根太どうしを連結する根太連結材とにより構成され、該根太ユニットが、支圧接合手段を介して、根太ユニットの下面と前記梁の上面を面どうしで当接し、両者間に圧縮力を作用する支圧接合により、前記梁に接合されることを特徴としている。
【０００７】
請求項２記載の根太ユニットと梁の接合構造は、前記支圧接合手段が、前記梁の上面に備えられる複数のスタッドボルトと、該スタッドボルトに嵌合するナットにより構成されており、前記根太ユニットの根太連結材には、鉛直方向に貫通する第１の貫通孔が設けられるとともに、該根太連結材の上面に、前記第１の貫通孔と同様の径を備える第２の貫通孔を有し、根太連結材の平面視形状より面積の小さい鋼板よりなる板座金が、第２の貫通孔を根太連結材の第１の貫通孔と同軸とするように配され、前記スタッドボルトが、梁の上フランジの上面で、前記根太連結材の第１の貫通孔と鉛直方向で同軸となる位置に、鉛直上方に突出して複数設けられて、該スタッドボルトが、根太連結材の第１の貫通孔及び板座金の第２の貫通孔に挿通されて、前記梁の上フランジ、前記根太ユニットの締結板、及び板座金の３者に圧縮力を作用するように、前記ナットがスタッドボルトに締結されることを特徴としている。
【０００８】
請求項３記載の根太ユニットと梁の接合構造は、前記支圧接合手段に、前記スタッドボルトに代わる通しボルト及び対をなすナットが複数用いられており、前記梁の上フランジには、前記根太連結材の第１の貫通孔と鉛直方向で同軸となる位置に第３の貫通孔が設けられて、前記通しボルトが、根太連結材の第１の貫通孔、板座金の第２の貫通孔、及び梁の上フランジの第３の貫通孔に挿通されるとともに、前記梁の上フランジ、前記根太ユニットの締結板、及び板座金の３者に圧縮力を作用するように、通しボルトの両端部近傍各々にナットが締結されることを特徴としている。
【０００９】
請求項４記載の根太ユニットと梁の接合構造は、前記支圧接合手段に、長尺ボルト及びナットと対をなすＬ型鋼が複数用いられており、前記長尺ボルトが、梁及び根太ユニットを構成する根太連結材の部材高さを足し合わせた長さより長い部材長を有するとともに、前記Ｌ型鋼が、前記梁の部材幅より長い部材長を有しており、前記梁の上面で所定位置に根太ユニットが載置された状態で、対をなすＬ型鋼各々が、長さ方向を梁の幅方向と平行にして、梁の下面及び根太連結材の上面に、これらを挟み込むとともに面どうしで当接するように配されて、梁及び根太ユニットの根太連結材、及びＬ型鋼の３者に、鉛直方向の圧縮力を作用するように、対をなすＬ型鋼の向かい合う両端部どうし各々に、鉛直状の長尺ボルトが締結されることを特徴としている。
【００１０】
請求項５記載の根太ユニットと梁の接合構造は、前記支圧接合手段が、梁の部材幅より長い部材長を有するＬ型鋼と、対をなすフック付きボルトにより構成されており、前記梁の上面で所定位置に根太ユニットが載置された状態で、根太連結材の上面に前記Ｌ型鋼が、長さ方向を梁の幅方向と平行にして面どうしで当接するように載置されて、梁の上フランジ及び根太ユニットの根太連結材、及びＬ型鋼の３者に圧縮力を作用するように、前記フック付きボルトが、一端を梁の上フランジの両側部各々の下面に当接された状態で、他端がＬ型鋼の両端部に締結されることを特徴としている。
【００１１】
請求項６記載の根太ユニットと梁の接合構造は、前記根太ユニットを構成する根太連結材が、前記梁の上フランジと同様の幅を有してなり、前記支圧接合手段には、前記根太連結材の両側面各々に面どうしで接合するように固着手段を介して固着され、根太連結材より下方に突出して延在するように配される対をなす締結板と、対をなすＬ型鋼、及び締結手段が複数用いられて、前記根太ユニットが、梁の上面で所定位置に載置されることにより形成される、対をなす締結板と前記梁の上フランジの裏面よりなる対をなす隅角部各々に、前記Ｌ型鋼が面どうしを当接するように配されて、該Ｌ型鋼と締結板が、前記締結手段を介して締結されることを特徴としている。
【００１２】
請求項７記載の根太の連結構造は、通気用の開口部を有するクリーンルームの床に適用され、梁と直交するように設置される複数の根太が、長さ方向に連続して配置されており、向かい合う端部どうしが、少なくとも両者の上面を覆うように跨って配される連結金具を介して連結される根太の連結構造であって、前記連結金具には、コの字型の断面を有する鋼材が用いられており、前記根太の上面及び側面の少なくとも一部を覆うように、前記連結金具が隣り合う根太の向かい合う端部どうしに跨るように配されて、接着手段を介して接着されることを特徴としている。
【００１３】
請求項８記載の根太の連結構造は、前記連結金具には、前記根太の幅と同様の幅を有する鋼板が用いられており、前記根太の上面を覆うように、前記連結金具が隣り合う根太の向かい合う端部どうしに跨るように配されて、接着手段を介して接着されることを特徴としている。
【００１４】
【発明の実施の形態】
本発明の根太ユニットと梁の接合構造、及び根太の連結構造を、図１から図５に示す。本発明は、複数の根太とこれを連結する根太連結材よりなる根太ユニットと、鉄骨造の梁の接合に際し、根太ユニットの根太連結材と梁とを支圧接合手段を介して支圧接合する構成としたことにより、簡略な構成で現場での溶接作業を不要とし施工性を向上させ、また、支圧接合により根太ユニットの微振動を低減できるとともに、根太ユニットからのせん断力をスムーズに梁に伝達できるものである。
【００１５】
（第１の実施の形態）
図１に示すように、通気用の開口部を必要とするクリーンルームの床には、構造物の架構を構成する梁１の上面に、複数の根太ユニット２が所定の間隔をもって設置されている。該根太ユニット２は、複数の根太３及び根太連結材４とにより構成されている。前記根太３は、プレキャストコンクリート造よりなり、隣り合う前記梁１の離間間隔の倍数となる部材長に製作されるもので、前記梁１に直交して配置すると、両端部を梁１と略同軸上に配置できる構成を有している。本実施の形態では、４体の梁１に跨る部材長に製作されているが、その部材長は必ずしもこれにこだわるものではない。このような根太３は、所定の離間間隔を持って、複数が平行に配置されており、前記根太連結材４を介して連結されている。
【００１６】
該根太連結材４は、図２（ｂ）に示すように、上面及び下面に水平面を有し、前記根太３に直交するように配され、下面が根太３の下面と同一平面を形成する高さ位置で、根太３の側面に固定されている。本実施の形態では、根太連結材４を、根太３と一体成型されたプレキャストコンクリート造に構成しているが、隣り合う前記根太３の離間間隔を保持できる剛性を有し、上下面に水平面を形成できるものであれば、鉄骨材を用いる等、その部材にこだわるものではない。
これら根太連結材４は、前記根太３の長さ方向に対して、図２（ａ）に示すように、根太３の両端部各々と、その間には、少なくとも前記梁１の配置間隔と同様の間隔を有する位置に設置されている。このような構成は、前記梁１の上面に、前記根太３が直交するように根太ユニット２を載置した際に、前記根太連結材４がすべての梁１上に配置され、両者が面どうしで当接されることを目的としたものである。したがって、前記根太連結材４は隣り合う根太３に対して、少なくとも根太３が跨っている梁１の数量だけ設置されていればよい。
なお、本実施の形態では、前記根太３の水平方向の剛性を高めることを目的にその数量を増加し、梁１と鉛直方向で同軸とならない位置にも複数の根太連結材４ｂを設置しているが、これらは、必ずしも設ける必要はない。
【００１７】
このような構成の根太ユニット２は、本実施の形態においてその全体がプレキャストコンクリート製とされたもので、図１に示すように、根太３の断面形状は上部の幅寸法が下部の幅寸法よりも小さい台形状とされており、根太３の長さ方向にプレストレスが導入されている。このような構成により、根太３は、小断面でありながら十分な剛性を確保しており、微振動の発生を防止できるとともに、運搬時におけるクラックの発生を抑制できるものである。しかし、本実施の形態においてこれらの構成は、根太ユニット２に必ずしも適用する必要はない。
【００１８】
一方で、前記梁１は、鉄骨造よりなるもので、上面に水平なフランジを有するＨ型鋼を用いているが、必ずしもＨ型鋼にこだわるものではなく、上面に水平なフランジを有する鉄骨造に構成されれば、何れの鋼材を用いる構成としても良い。
【００１９】
上述する構成前記根太ユニット２及び梁１は、該梁１に対して根太３を直交させるとともに、前記根太連結材４の下面全面を梁１の上フランジ１ａの上面に面どうしで当接させるようにして、梁１の上面に根太ユニット２が配置されるものである。このように配置される根太ユニット２と梁１の接合構造を以下に示す。
【００２０】
図２（ｂ）に示すように、前記梁１上に載置された根太ユニット２は、前記根太連結材４の下面が、梁１の上フランジ１ａの上面と面どうしで当接するように位置決めされている。これらは、前記根太連結材４と梁１の上フランジ１ａが支圧接合手段５を介して、支圧接合されている。
本実施の形態において、前記支圧接合手段５には、複数のスタッドボルト６及びナット７が用いられており、該スタッドボルト６は、外周面にネジ節の施された丸棒鋼材が用いられている。
【００２１】
一方、図１に示すように、前記根太ユニット２の根太連結材４には、根太ユニット２の幅方向に所定の離間間隔をもって、鉛直方向に貫通する第１の貫通孔４ａが対をなして設けられている。また、該根太連結材４の上面には、根太連結材４の平面視形状よりも面積が小さい鋼板よりなる板座金８が載置されており、該板座金８には、前記第１の貫通孔４ａと鉛直状で同軸となる位置に、対をなして第２の貫通孔８ａが配されている。また、前記スタッドボルト６は、梁１上に根太ユニット２が配置された際に、根太連結材４の第１の貫通孔４ａと鉛直状で同軸となる位置に、前記梁１の上フランジ１ａから鉛直上方に突出するように、上フランジ１ａの上面に固着手段を介して固着されている。
【００２２】
これらは、前記スタッドボルト６が、前記根太連結材４の第１の貫通孔４ａ及び板座金８の第２の貫通孔８ａの両者に貫通された状態で、梁１の上フランジ１ａ、根太ユニット２の根太連結材４、及び板座金８の３者に鉛直方向の圧縮力が作用するように、スタッドボルト６にナット７を嵌合し、締結するものである。
【００２３】
第１の実施の形態では、スタッドボルト６を支圧接合手段５に用いた前記梁１と根太ユニット２の接合構造を示したが、第２から第５実施の形態では、支圧接合手段５に他の手段を用いた場合の梁１と根太ユニット２の接合構造を示す。
【００２４】
（第２の実施の形態）
図３（ａ）に示すように、前記梁１上に載置された根太ユニット２は、前記根太連結材４の下面が、梁１の上フランジ１ａの上面と面どうしで当接するように位置決めされており、前記根太連結材４には、根太ユニット２の長さ方向に所定の離間間隔をもって、鉛直方向に貫通する第１の貫通孔４ａが対をなして設けられている。また、該根太連結材４の上面には、第１の貫通孔４ａと同様の径を有する第２の貫通孔８ａを備え、第２の貫通孔８ａより略大きい断面形状を有する板座金８が、対をなす第１の貫通孔４ａの各々に載置されている。
一方、本実施の形態において、前記支圧接合手段５には、複数のネジきりボルト９及び対をなすナット７が用いられており、前記梁１の上フランジ１ａには、ウェブ１ｂを挟んで幅方向に対をなして、第１の貫通孔４ａと鉛直状で同軸となる位置に、第３の貫通孔１ｃが設けられている。また、前記上フランジ１ａの下面にも第３の貫通孔１ｃに鉛直方向で同軸となるように第２の貫通孔８ａを位置決めした板座金８が備えられている。
【００２５】
これらは、前記ネジきりボルト９が、前記梁１の上フランジ１ａに設けられた第３の貫通孔１ｃ、根太連結材４の第１の貫通孔４ａ及びこれらを挟み込むように対をなして配された板座金８の第２の貫通孔８ａの４者に貫通された状態で、梁１の上フランジ１ａ、根太ユニット２の根太連結材４、及び対をなす板座金８の４者に鉛直方向の圧縮力が作用するように、ネジきりボルト９の両端部にナット７を嵌合し、締結するものである。
なお、前記梁１の上フランジ１ａに設けられた第３の貫通孔１ｃを、長孔に形成し、前記梁１と根太ユニット２との位置あわせを行う際に、微調整が行える構成としても良い。
【００２６】
（第３の実施の形態）
図３（ｂ）に示すように、前記梁１上に載置された根太ユニット２は、前記根太連結材４の下面が、梁１の上フランジ１ａの上面と面どうしで当接するように位置決めされているのみで、根太連結材４及び梁１の上フランジ１ａには、第１及び第２の実施の形態で示したような第１の貫通孔４ａ及び第３の貫通孔１ｃが設けられていない。記板座金８も用いられていない。
一方、前記支圧接合手段５には、対をなすＬ型鋼１０及び長尺ボルト１１が用いられており、該長尺ボルト１１は、その部材長が根太連結材４と梁１の部材高さを足し合わせた高さよりも長い長さに成形されている。また、Ｌ型鋼１０は、その部材長が前記梁１の梁幅よりも長く成形されている。
なお、本実施の形態における支圧接合手段５を採用する場合には、前記梁１は、下面にも水平なフランジを有する必要があり、本実施の形態ではＨ型鋼を用いているが、上下面に水平面を有する構成であれば、他の断面形状を有する鋼材を用いても良い。
【００２７】
これらは、根太連結材４の上面及び梁１の下面各々に、対をなす前記Ｌ型鋼１０が、面どうしを当接するとともに長さ方向を梁１の幅方向と平行にした上で、両者を鉛直方向で同軸とするように配置されている。これら鉛直方向で同軸に配された対をなす前記Ｌ型鋼１０を介して、梁１及び根太ユニット２の根太連結材４の両者に対して鉛直方向の圧縮力を作用するように、対をなす前記Ｌ型鋼１０の向かい合う両端部各々に、第２の実施の形態で示した板座金８を配した上で前記長尺ボルト１１を締結するものである。
なお、前記Ｌ型鋼１０は、必ずしもこれにこだわるものではなく、上述するような両端部に長尺ボルト１１を配される構成により生じる面外方向の力にも変形しない剛性を有していれば、鋼板等他の部材を用いても良い。
【００２８】
（第４の実施の形態）
図４（ａ）に示すように、本実施の形態では、第３の実施の形態と同様に、前記梁１上に載置された根太ユニット２は、前記根太連結材４の下面が、梁１の上フランジ１ａの上面と面どうしで当接するように位置決めされているのみで、根太連結材４及び梁１の上フランジ１ａには、第１及び第２の実施の形態で示したような第１の貫通孔４ａ及び第３の貫通孔１ｃが設けられておらず、前記板座金８も用いられていない。
一方、前記支圧接合手段５には、Ｌ型鋼１０及び対をなすフック付きボルト１５が用いられており、該Ｌ型鋼１０は、第３の実施の形態と同様に、その部材長が前記梁１の梁幅よりも長く成形されている。また、フック付きボルト１５は、一端１５ａと比較して他端１５ｂの折り返し長さが短く形成された、見かけ上Ｊ字型のボルトである。該フック付きボルト１５は、他端１５ｂの先端部に平滑面が形成されているとともに、一端１５ａの折り返し部からの長さを、他端１５ｂの長さ、前記根太連結材４及び梁１の上フランジ１ａの部材高さの３者を足し合わせた長さよりも長く形成されている。
【００２９】
これらは、前記梁１上に載置された根太ユニット２が、前記根太連結材４の下面を、梁１の上フランジ１ａの上面と面どうしで当接するように位置決めされた状態で、根太連結材４の上面に、前記Ｌ型鋼１０が、面どうしを当接するとともに長さ方向を梁１の幅方向と平行とするように配置されている。これらＬ型鋼１０を用いて、梁１の上フランジ１ａ及び根太ユニット２の根太連結材４の両者に対して鉛直方向の圧縮力を作用するように、前記フック付きボルト１５の他端１５ｂの先端部が梁１の上フランジ１ａの両側部近傍各々の裏面に当接するように、前記フック付きボルト１５を対をなして配するとともに、一端１５ａを前記Ｌ型鋼１０の両端部各々近傍に設けられた孔１０ａに貫通させるとともに、第２の実施の形態で示した板座金８を配した上で、ナットを介して締結するものである。
【００３０】
なお、第３の実施の形態でも述べたように、前記Ｌ型鋼１０は、必ずしもこれにこだわるものではなく、上述するような両端部にフック付きボルト１５を配される構成により生じる面外方向の力にも変形しない剛性を有していれば、鋼板等他の部材を用いても良い。
【００３１】
（第５の実施の形態）
図４（ｂ）に示すように、本実施の形態において、前記支圧接合手段５には、対をなす締結板１２、Ｌ型鋼１０、及び締結手段１３が用いられている。
対をなす前記締結板１２は、根太ユニット２の根太連結材４の部材高さよりも高い部材長を備えた鋼板よりなり、裏面にスタッドジベル１２ａが設けられて、該スタッドジベル１２ａを前記根太連結材４の側部に埋設されることにより前記根太連結材４の側面に面どうしで当接するように一体的に設けられている。これらは、あらかじめ工場等で根太ユニット２を製作する際に同時に設けるもので、前記締結板１２は、下端部近傍が根太連結材４より鉛直下方に突出するように配されるものである。
このとき、前記根太ユニット２の根太連結材４は、根太ユニット２の長さ方向の部材長さが前記梁１の上フランジ１ａの幅と同様に形成されている。
【００３２】
これらは、前記梁１上に載置された根太ユニット２が、根太連結材４の両側部各々に設けられた締結板１２で前記梁１の上フランジ１ａを挟むようにして、前記根太連結材４の下面を梁１の上フランジ１ａの上面と面どうしで当接されることとなる。これにより、締結板１２と梁１の上フランジ１ａの裏面とにより形成された対をなす隅角部各々には、面どうしが当接するように対をなす前記Ｌ型鋼１０が配されて、該Ｌ型鋼１０と前記締結板１２とを締結手段１３を介して締結することにより、梁１の上フランジ１ａ及び根太ユニット２の根太連結材４の両者に対して鉛直方向の圧縮力を作用させるとともに、水平方向の挙動を抑制するものである。
【００３３】
なお、前記締結板１２は、必ずしも前記根太ユニット２の根太連結材４にあらかじめ固着しておく必要はなく、図４（ｃ）に示すように、前記根太連結材４の側面で所定位置にあらかじめ袋ナット１４を埋設しておき、現場において、所定の高さ位置に孔１２ｂを設けておいた締結板１２を面どうしで当接させるとともに、締結手段１３を該穴１２ｂ及び袋ナット１４に挿通させた上で、固着手段１６を介して袋ナット１４に締結手段１３を固定してもよい。
【００３４】
上述する第１から第５の実施の形態によれば、鉛直方向で同軸に位置する梁１の上フランジ１ａと根太ユニット２の根太連結材４が面どうしで当接するとともに、前記支圧接合手段５を介して支圧接合とされることから、第１から第４の実施の形態では、根太ユニット２からのせん断力を、板座金８もしくはＬ型鋼１０と根太連結材４、及び根太連結材４と梁１の上フランジ１ａ各々の接触面に生じる摩擦により、前記梁１にスムーズに伝達することが可能となる。また、第５の実施の形態では、根太ユニット２からのせん断力を、根太連結材４と梁１の上フランジ１ａの接触面に生じる摩擦、及び梁１の上フランジ１ａの側面と締結板１２との当接により、前記梁１にスムーズに伝達することが可能となる。
さらに、支圧接合手段５を介して、根太連結材４と梁１の上フランジ１ａに鉛直方向の圧縮力が作用するため、根太ユニット２に生じやすい微振動の発生を抑制することが可能となる。
【００３５】
前記支圧接合手段５は、溶接等の固着手段を用いないため、作業性が向上することによる工期短縮、工費削減を図ることが可能になる。また、溶接等の火気を使用しないことから、新たな根太ユニット２を梁１に接合する際にも、既に施工されている床仕上げ等を保護するための仮設作業等を省略できるため、施工性をより向上することが可能となる。
【００３６】
さらに、第１の実施の形態及び第２の実施の形態では、前記根太ユニット２の根太連結材４に、あらかじめ第１の貫通孔４ａが設けられるとともに、前記梁１の上フランジ１ａの上面における所定位置には、該第１の貫通孔４ａと鉛直軸上で同軸とする所定位置に、あらかじめスタッドボルト６もしくは第３の貫通孔１ｃが設置されている構成であるため、前記根太ユニット２の位置決めを容易に実施でき、作業効率を一層向上することが可能となる。
【００３７】
（第６の実施の形態）
第１から第５の実施の形態では、支圧接合手段５を用いた梁１と根太ユニット２の接合構造を示したが、第６の実施の形態では、梁１に接合され、根太３の長さ方向に隣り合う根太ユニット２の連結構造を示す。
図５（ａ）に示すように、根太ユニット２は、第１の実施の形態で示した支圧接合手段５を介して、前記梁１の上フランジ１ａに支圧接合されている。これら根太ユニット２は、根太ユニット２を構成する根太３が、長さ方向に連続するように複数を配置されており、隣り合う根太３の向かい合う端部どうしは、前記梁１の上フランジ１ａの上面で端面を向かい合わせている。このような隣り合う根太３の向かい合う端部どうしは、両者に跨るように配置された連結金具１７により連結されている。
【００３８】
該連結金具１７は、図５（ｂ）に示すように、断面がコの字型の鋼板また溝鋼により構成されており、前記根太３の上面及び側面に内周面が連続して接する大きさに成形されている。該連結金具１７は、前記根太３の上方からこれを覆うように配されて、エポキシ樹脂等の接着剤１８を介して接着され、これにより隣り合う根太３は、向かい合う端部どうしを断面から見て上部近傍で連結されることとなる。
【００３９】
なお、前記連結金具１７は、必ずしもこれにこだわるものではなく、図５（ｃ）に示すように、例えば根太３の幅とほぼ同様の幅と、隣り合う根太３の両者に跨る長さを有する鋼板等の板材でもよい。つまり、隣り合うの根太３の上面どうしを連結できれば、連結金具１７の形状はいずれを用いてもよい。
また、本実施の形態では、第１の実施の形態から第５の実施の形態で示した根太ユニット２を例にとり、根太３の連結構造を示したが、該根太３は必ずしも根太ユニット２を構成するものである必要はなく、一般に用いられている単独の根太３どうしを長さ方向に複数連結する場合に用いても良い。
さらに、前記接着剤１８は、コンクリートと鉄骨等異なる部材どうしをも十分な接着力を持って接合できるものであれば、何れの接着剤を用いても良い。
【００４０】
上述する構成によれば、隣り合う根太３の向かい合う端部どうしを連結金具１７を介して上端部を連結する構成としたことから、両者の回転剛性を高めることができ、根太３に生じやすい微振動を防止することが可能となる。
また、連結金具１７と根太３は、前記接着剤１８により固着されるのみの構成であるため、従来より隣り合う根太３の長さ方向の連結に一般的に用いられていた現場打ちコンクリートによる連結作業を不要とすることができ、工費削減及び工期短縮に大きく寄与することが可能となる。
さらに、根太３の上面には、後にグレーチングを支持する脚部が配置されることから、あらかじめ連結金具１７の上面に脚部を固着させておけば、さらにクリーンルームの床を構築する際の全体の工期短縮を図ることが可能となる。
【００４１】
【発明の効果】
請求項１記載の根太ユニットと梁の接合構造によれば、通気用の開口部を有するクリーンルームの床に適用される根太ユニットと梁の接合構造であって、前記梁が、少なくとも上面に水平面を形成する上フランジを備えた型鋼よりなる鉄骨造に構成されるとともに、前記根太ユニットが、前記梁の上フランジの上面で、梁と直交するように所定の間隔をもって離間配置される複数の根太と、該根太に直交するとともに、下端面が根太の下端面と同一水平面を形成し、少なくとも根太の両端部、及び前記梁と同様の離間間隔位置に複数配され、隣り合う根太どうしを連結する根太連結材とにより構成され、該根太ユニットが、支圧接合手段を介して、根太ユニットの下面と前記梁の上面を面どうしで当接し、両者間に圧縮力を作用する支圧接合により、前記梁に接合されることから、根太ユニットからのせん断力を、少なくとも根太連結材及び梁の上フランジの接触面に生じる摩擦により、前記梁にスムーズに伝達することが可能となるとともに、支圧接合手段により、根太ユニット及び梁に鉛直方向の圧縮力が作用しているため、根太ユニットに生じやすい微振動等の発生を抑制することが可能となる。
また、溶接等の固着手段を用いないため、作業性が向上することによる工期短縮、工費削減を図ることが可能になる。
さらに、溶接等の火気を使用しないことにより、既存部分の保護に係る作業を省略でき、前記クリーンルームを使用しながら、前記根太ユニットの取り付け作業を実施することが可能となる。
【００４２】
請求項２及び請求項３に記載の根太ユニットと梁の接合構造によれば、前記支圧接合手段が、前記梁の上面に備えられる複数のスタッドボルトと、該スタッドボルトに嵌合するナットにより構成されており、前記根太ユニットの根太連結材には、鉛直方向に貫通する第１の貫通孔が設けられるとともに、該根太連結材の上面に、前記第１の貫通孔と同様の径を備える第２の貫通孔を有し、根太連結材の平面視形状より面積の小さい鋼板よりなる板座金が、第２の貫通孔を根太連結材の第１の貫通孔と同軸とするように配され、前記スタッドボルトが、梁の上フランジの上面で、前記根太連結材の第１の貫通孔と鉛直方向で同軸となる位置に、鉛直上方に突出して複数設けられて、該スタッドボルトが、根太連結材の第１の貫通孔及び板座金の第２の貫通孔に挿通されて、前記梁の上フランジ、前記根太ユニットの締結板、及び板座金の３者に圧縮力を作用するように、前記ナットがスタッドボルトに締結される。
【００４３】
もしくは、前記支圧接合手段に、前記スタッドボルトに代わる通しボルト及び対をなすナットが複数用いられており、前記梁の上フランジには、前記根太連結材の第１の貫通孔と鉛直方向で同軸となる位置に第３の貫通孔が設けられて、前記通しボルトが、根太連結材の第１の貫通孔、板座金の第２の貫通孔、及び梁の上フランジの第３の貫通孔に挿通されるとともに、前記梁の上フランジ、前記根太ユニットの締結板、及び板座金の３者に圧縮力を作用するように、通しボルトの両端部近傍各々にナットが締結される。
【００４４】
これにより、根太ユニットからのせん断力を、板座金と根太連結材、及び根太連結材と梁の上フランジ各々の接触面に生じる摩擦により、前記梁にスムーズに伝達することが可能となるとともに、支圧接合手段による根太連結材及び梁の上フランジへの鉛直方向の圧縮作用により、根太ユニットに生じやすい微振動の発生を抑制することが可能となる。
また、前記根太ユニットの根太連結材に、あらかじめ第１の貫通孔が設けられるとともに、前記梁の上フランジの上面における所定位置には、該第１の貫通孔と鉛直軸上で同軸とする所定位置に、あらかじめスタッドボルトもしくは第３の貫通孔が設置されている構成であるため、前記根太ユニットの位置決めを容易に実施でき、作業効率を一層向上することが可能となる。
【００４５】
請求項４及び請求項５に記載の根太ユニットと梁の接合構造によれば、前記支圧接合手段に、長尺ボルト及びナットと対をなすＬ型鋼が複数用いられており、前記長尺ボルトが、梁及び根太ユニットを構成する根太連結材の部材高さを足し合わせた長さより長い部材長を有するとともに、前記Ｌ型鋼が、前記梁の部材幅より長い部材長を有しており、前記梁の上面で所定位置に根太ユニットが載置された状態で、対をなすＬ型鋼各々が、長さ方向を梁の幅方向と平行にして、梁の下面及び根太連結材の上面に、これらを挟み込むとともに面どうしで当接するように配されて、梁及び根太ユニットの根太連結材、及びＬ型鋼の３者に、鉛直方向の圧縮力を作用するように、対をなすＬ型鋼の向かい合う両端部どうし各々に、鉛直状の長尺ボルトが締結される。
【００４６】
もしくは、前記支圧接合手段が、梁の部材幅より長い部材長を有するＬ型鋼と、対をなすフック付きボルトにより構成されており、前記梁の上面で所定位置に根太ユニットが載置された状態で、根太連結材の上面に前記Ｌ型鋼が、長さ方向を梁の幅方向と平行にして面どうしで当接するように載置されて、梁の上フランジ及び根太ユニットの根太連結材、及びＬ型鋼の３者に圧縮力を作用するように、前記フック付きボルトが、一端を梁の上フランジの両側部各々の下面に当接された状態で、他端がＬ型鋼の両端部に締結される。
【００４７】
これにより、根太ユニットからのせん断力を、Ｌ形鋼と根太連結材、及び根太連結材と梁の上フランジ各々の接触面に生じる摩擦により、前記梁にスムーズに伝達することが可能となるとともに、支圧接合手段による根太連結材及び梁の上フランジへの鉛直方向の圧縮作用により、根太ユニットに生じやすい微振動の発生を抑制することが可能となる。
また、前記根太ユニット及び梁に対して、新たな構成を構成を加えることなく、支圧接合手段を用いるのみの構成であることから、簡略な構成で汎用性も高く、より施工性を向上することが可能となる。
【００４８】
請求項６に記載の根太ユニットと梁の接合構造によれば、前記根太ユニットを構成する根太連結材が、前記梁の上フランジと同様の幅を有してなり、前記支圧接合手段には、前記根太連結材の両側面各々に面どうしで接合するように固着手段を介して固着され、根太連結材より下方に突出して延在するように配される対をなす締結板と、対をなすＬ型鋼、及び締結手段が複数用いられて、前記根太ユニットが、梁の上面で所定位置に載置されることにより形成される、対をなす締結板と前記梁の上フランジの裏面よりなる対をなす隅角部各々に、前記Ｌ型鋼が面どうしを当接するように配されて、該Ｌ型鋼と締結板が、前記締結手段を介して締結される。
【００４９】
これにより、根太ユニットからのせん断力を、根太連結材と梁の上フランジの接触面に生じる摩擦、及び梁の上フランジの側面と締結板との当接により、前記梁にスムーズに伝達することが可能となる。
また、前記根太ユニットの根太連結材の両側面各々に固着された対をなす締結板が、前記梁の上フランジを挟むように配置されるため、前記根太ユニットの梁に対する位置決めを容易に実施でき、作業効率を一層向上することが可能となる。
【００５０】
請求項７及び請求項８に記載の根太の連結構造によれば、通気用の開口部を有するクリーンルームの床に適用され、梁と直交するように設置される複数の根太が、長さ方向に連続して配置されており、向かい合う端部どうしが、少なくとも両者の上面を覆うように跨って配される連結金具を介して連結される根太の連結構造であって、前記連結金具には、コの字型の断面を有する鋼材が用いられており、前記根太の上面及び側面の少なくとも一部を覆うように、前記連結金具が隣り合う根太の向かい合う端部どうしに跨るように配されて、接着手段を介して接着される。
【００５１】
もしくは、前記連結金具には、前記根太の幅と同様の幅を有する鋼板が用いられており、前記根太の上面を覆うように、前記連結金具が隣り合う根太の向かい合う端部どうしに跨るように配されて、接着手段を介して接着されることから、隣り合う根太の向かい合う端部各々の回転剛性を高めることができ、根太に生じやすい微振動を防止することが可能となる。
【００５２】
また、連結金具と根太は、樹脂製の接着剤により固着されるのみの構成であるため、従来より隣り合う根太の長さ方向の連結に一般的に用いられていた現場打ちコンクリートによる連結作業を不要とすることができ、工費削減及び工期短縮に大きく寄与することが可能となる。
さらに、根太の上面には、後にグレーチングを支持する脚部が配置されることから、あらかじめ連結金具の上面に脚部を固着させておけば、さらにクリーンルームの床を構築する際の全体の工期短縮を図ることが可能となる。
【図面の簡単な説明】
【図１】本発明に係る根太ユニットと梁の接合構造の斜視図を示すものである。
【図２】本発明に係る根太ユニットと梁の接合構造の平面図及び側面図を示すものである。
【図３】本発明に係る根太ユニットと梁の接合構造の他の事例を示すものである（その１）。
【図４】本発明に係る根太ユニットと梁の接合構造の他の事例を示すものである（その２）。
【図５】本発明に係る長さ方向に隣り合う根太の連結構造を示すものである。
【符号の説明】
１梁
１ａ上フランジ
１ｂウェブ
１ｃ第３の貫通孔
２根太ユニット
３根太
４根太連結材
４ａ第１の貫通孔
５支圧接合手段
６スタッドボルト
７ナット
８板座金
８ａ第２の貫通孔
９ネジきりボルト
１０Ｌ型鋼
１０ａ孔
１１長尺ボルト
１２締結板
１２ａスタッドジベル
１２ｂ孔
１３締結手段
１４袋ナット
１５フック付きボルト
１６固着手段
１７連結金具
１８接着剤[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint structure of a joist unit and a beam used for a floor of a clean room, and a joint structure of the joist.
[0002]
[Prior art]
Conventionally, as shown in Patent Literature 1, a plurality of joists used for a floor of a clean room are arranged in parallel with a predetermined separation interval, and then a joist unit integrated via a joist connecting member has been devised. I have. In the joist unit, a metal joint is buried in a predetermined position on the side of the joist in advance, and the metal joint is welded to a steel frame beam by field welding or bolting to join the beam.
As shown in Patent Document 2, the connection of the joists adjacent in the length direction is such that the ends of the adjacent joists face each other on the upper surface of the beam, and the both are fastened by cast-in-place concrete.
[0003]
[Patent Document 1]
JP 2001-244509 A
[Patent Document 2]
JP-A-2002-113808
[0004]
[Problems to be solved by the invention]
However, since the above-described joint structure between the joist unit and the beam has a configuration in which the metal joint is buried in the joist in advance, the production of the joist unit, the repair of the painted surface, and the like are likely to be complicated. In addition, when the joint metal is welded to the beam in the field, the construction becomes complicated, and problems such as securing of quality and temporary curing against the use of fire arise.
On the other hand, the connection structure of joists adjacent in the length direction is a rigid connection made by cast-in-place concrete, so that concrete is added to the construction procedure, the construction period is extended, and the cost tends to be high.
[0005]
In view of the above circumstances, an object of the present invention is to provide a joint structure between a joist unit and a beam with a simple configuration and good workability, and a joint structure of the joist.
[0006]
[Means for Solving the Problems]
The joint structure between a joist unit and a beam according to claim 1, which is a joint structure between a joist unit and a beam applied to a floor of a clean room having an opening for ventilation, wherein the beam forms a horizontal plane at least on an upper surface. A plurality of joists, which are configured in a steel frame made of a shape steel having an upper flange, and the joist units are spaced apart from each other at a predetermined interval so as to be orthogonal to the beams on the upper surface of the upper flange of the beams; While being orthogonal to the joist, the lower end face forms the same horizontal plane as the lower end face of the joist, and at least both end portions of the joist and a plurality of the joists are arranged at the same spacing as the beam, and the joist connecting material for connecting the adjacent joists. The joist unit is configured to contact the lower surface of the joist unit and the upper surface of the beam face-to-face via a bearing joining means, and to apply a compressive force between the two to form a bearing joint. It is characterized by being joined to the beam.
[0007]
3. The joint structure between a joist unit and a beam according to claim 2, wherein the bearing connection means includes a plurality of stud bolts provided on an upper surface of the beam, and a nut fitted to the stud bolt. 4. The joist connecting member of the unit is provided with a first through hole penetrating in the vertical direction, and has a second through hole having the same diameter as the first through hole on the upper surface of the joist connecting member. A plate washer made of a steel plate having an area smaller than the shape of the joist connecting member in a plan view is arranged so that the second through hole is coaxial with the first through hole of the joist connecting member, and the stud bolt is a beam. A plurality of stud bolts are provided on the upper surface of the upper flange so as to protrude vertically upward at positions vertically coaxial with the first through-hole of the joist connecting member, and the stud bolt is provided in the first through hole of the joist connecting member. Hole and the second through hole of the plate washer Te, flange on the beam, the fastening plate of the joists unit, and to exert a compressive force on the three parties of the plate washer, the nut is characterized in that it is fastened to the stud bolts.
[0008]
The joint structure between a joist unit and a beam according to claim 3, wherein a plurality of through bolts and a pair of nuts are used in place of the stud bolts for the bearing connection means, and the joist is provided on an upper flange of the beam. A third through-hole is provided at a position that is coaxial in the vertical direction with the first through-hole of the connecting member, and the through bolt is provided with a first through-hole of the joist connecting member and a second through-hole of the plate washer. , And both ends of the through bolt so as to be inserted into the third through hole of the upper flange of the beam and to apply a compressive force to the upper flange of the beam, the fastening plate of the joist unit, and the plate washer. A nut is fastened to each of the vicinity of the portion.
[0009]
In the joint structure of a joist unit and a beam according to claim 4, a plurality of L-shaped steels paired with a long bolt and a nut are used for the bearing joining means, and the long bolt uses a beam and a joist unit. Along with a member length longer than the sum of the member heights of the constituting joist connecting members, the L-shaped steel has a member length longer than the member width of the beam, and is located at a predetermined position on the upper surface of the beam. With the joist unit mounted, each pair of L-shaped steels has their length direction parallel to the width direction of the beam, sandwiches them between the lower surface of the beam and the upper surface of the joist connecting material, and applies them to each other. In order to apply a vertical compressive force to the three members of the beam and the joist unit and the joist connecting member of the joist unit and the L-shaped steel, the opposite ends of the pair of the L-shaped steel are vertically connected to each other. Specially that long bolts It is set to.
[0010]
The joint structure between a joist unit and a beam according to claim 5, wherein the bearing connection means is constituted by an L-shaped steel having a member length longer than a member width of the beam, and a pair of bolts with hooks. In a state where the joist unit is mounted at a predetermined position on the upper surface, the L-shaped steel is mounted on the upper surface of the joist connecting member so that the length direction is parallel to the width direction of the beam and abuts on the surfaces, One end of the bolt with a hook was abutted on the lower surface of each of both sides of the upper flange of the beam so as to apply compressive force to the upper flange of the beam, the joist connecting member of the joist unit, and the L-shaped steel. In this state, the other end is fastened to both ends of the L-shaped steel.
[0011]
In the joint structure of a joist unit and a beam according to claim 6, the joist connecting member constituting the joist unit has the same width as an upper flange of the beam, and the supporting joist includes the joist. A pair of fastening plates, which are fixed to both side surfaces of the connecting member so as to be joined to each other via fixing means, and are arranged so as to protrude and extend below the joist connecting member, and a pair of L-shaped steels A plurality of fastening means are used, and the joist unit forms a pair consisting of a pair of fastening plates and a back surface of an upper flange of the beam, which are formed by being placed at predetermined positions on the upper surface of the beam. The L-shaped steel is disposed at each of the corners so that the surfaces come into contact with each other, and the L-shaped steel and a fastening plate are fastened via the fastening means.
[0012]
The joint structure of the joist according to claim 7 is applied to a floor of a clean room having an opening for ventilation, and a plurality of joists installed orthogonally to the beam are continuously arranged in the length direction. , The opposed end portions have a joist connection structure that is connected via connection fittings that are arranged so as to cover at least the upper surfaces of both, and the connection fitting has a U-shaped cross section. A steel material is used, and the connecting metal fittings are arranged so as to straddle the opposite ends of the adjacent joists so as to cover at least a part of the upper surface and side surfaces of the joists, and are bonded via bonding means. It is characterized by:
[0013]
9. The joist connecting structure according to claim 8, wherein a steel plate having a width similar to the width of the joist is used for the connecting hardware, and the connecting joists are adjacent to each other so as to cover an upper surface of the joist. Are arranged so as to straddle the end portions facing each other and are bonded through bonding means.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 to 5 show a joint structure of a joist unit and a beam and a connecting structure of the joist according to the present invention. According to the present invention, in joining a joist unit made of a plurality of joists and a joist connecting member connecting the joists and a steel beam, the joist connecting members of the joist unit and the beams are butt-jointed via a butt-joining means. With this configuration, welding work on site is not required with a simple configuration, improving workability.Also, micro vibration of the joist unit can be reduced by bearing connection, and the shear force from the joist unit can be smoothly beamed. Can be communicated to
[0015]
(First Embodiment)
As shown in FIG. 1, on a floor of a clean room requiring an opening for ventilation, a plurality of joist units 2 are installed at predetermined intervals on the upper surface of a beam 1 constituting a frame of a structure. The joist unit 2 is composed of a plurality of joists 3 and joist connecting members 4. The joist 3 is made of precast concrete, and is manufactured to have a member length that is a multiple of the spacing between the adjacent beams 1. When the joists 3 are arranged orthogonal to the beams 1, both ends are substantially coaxial with the beams 1. It has a configuration that can be placed on top. In the present embodiment, the members are manufactured to have a member length straddling the four beams 1, but the member length is not necessarily limited to this. A plurality of such joists 3 are arranged in parallel with a predetermined separation interval, and are connected via the joist connecting members 4.
[0016]
As shown in FIG. 2 (b), the joist connecting member 4 has a horizontal surface on the upper surface and the lower surface, and is disposed so as to be orthogonal to the joist 3, and the lower surface forms the same plane as the lower surface of the joist 3. In this position, it is fixed to the side surface of the joist 3. In the present embodiment, the joist connecting member 4 is formed in a precast concrete structure integrally molded with the joist 3, but has a rigidity capable of maintaining a separation interval between the adjacent joists 3, and has horizontal planes on upper and lower surfaces. As long as it can be formed, it is not limited to a member such as a steel frame material.
As shown in FIG. 2 (a), these joist connecting members 4 are at least the same as the arrangement interval of the beam 1 between both ends of the joist 3, as shown in FIG. It is installed at a position with an interval. With such a configuration, when the joist unit 2 is placed on the upper surface of the beam 1 so that the joist 3 is orthogonal to the joist, the joist connecting members 4 are arranged on all the beams 1 and both are connected to each other. It is intended to be brought into contact with. Therefore, it is sufficient that the joist connecting members 4 are provided with respect to the adjacent joists 3 by at least the number of beams 1 over which the joists 3 straddle.
In this embodiment, in order to increase the horizontal rigidity of the joist 3, the number thereof is increased, and a plurality of joist connecting members 4 b are installed at positions not coaxial with the beam 1 in the vertical direction. However, these need not necessarily be provided.
[0017]
In this embodiment, the joist unit 2 having such a configuration is entirely made of precast concrete, and as shown in FIG. 1, the cross-sectional shape of the joist 3 is such that the upper width dimension is smaller than the lower width dimension. Also has a small trapezoidal shape, and prestress is introduced in the length direction of the joist 3. With such a configuration, the joist 3 has a sufficient rigidity while having a small cross section, and can prevent the occurrence of micro-vibration and suppress the occurrence of cracks during transportation. However, these configurations need not necessarily be applied to the joist unit 2 in the present embodiment.
[0018]
On the other hand, the beam 1 is made of a steel frame, and uses an H-shaped steel having a horizontal flange on an upper surface. However, the beam 1 is not necessarily limited to the H-shaped steel, and is formed of a steel frame having a horizontal flange on an upper surface. If so, any steel material may be used.
[0019]
The joist unit 2 and the beam 1 described above are arranged so that the joist 3 is perpendicular to the beam 1 and the entire lower surface of the joist connecting member 4 abuts on the upper surface of the upper flange 1a of the beam 1 face to face. The joist unit 2 is arranged on the upper surface of the beam 1. The joint structure of the joist unit 2 and the beam 1 thus arranged is shown below.
[0020]
As shown in FIG. 2B, the joist unit 2 placed on the beam 1 is positioned such that the lower surface of the joist connecting member 4 abuts on the upper surface of the upper flange 1a of the beam 1 face to face. Have been. In these, the joist connecting member 4 and the upper flange 1a of the beam 1 are bearing-joined via bearing-joining means 5.
In the present embodiment, a plurality of stud bolts 6 and nuts 7 are used for the bearing connection means 5, and the stud bolts 6 are made of round bar steel having a threaded joint on the outer peripheral surface. ing.
[0021]
On the other hand, as shown in FIG. 1, a first through hole 4 a penetrating vertically in the joist connecting member 4 of the joist unit 2 at a predetermined spacing in the width direction of the joist unit 2 forms a pair. Is provided. A plate washer 8 made of a steel plate having an area smaller than the plan view shape of the joist connecting member 4 is placed on the upper surface of the joist connecting member 4. A pair of second through-holes 8a is arranged at a position that is coaxial with the hole 4a in a vertical shape. Further, when the joist unit 2 is arranged on the beam 1, the stud bolt 6 is provided at a position where the upper flange 1a of the beam 1 is vertically coaxial with the first through hole 4a of the joist connecting member 4. Is fixed to the upper surface of the upper flange 1a via fixing means so as to project vertically upward from the upper flange 1a.
[0022]
In the state where the stud bolt 6 is penetrated through both the first through hole 4a of the joist connecting member 4 and the second through hole 8a of the plate washer 8, the upper flange 1a of the beam 1 and the joist unit The nut 7 is fitted and fastened to the stud bolt 6 so that a vertical compressive force acts on the three joist connecting members 4 and the plate washer 8.
[0023]
In the first embodiment, the joining structure of the beam 1 and the joist unit 2 using the stud bolts 6 as the bearing joining means 5 is shown. In the second to fifth embodiments, the bearing joining means 5 is used. 2 shows a joint structure between the beam 1 and the joist unit 2 when other means are used.
[0024]
(Second embodiment)
As shown in FIG. 3A, the joist unit 2 placed on the beam 1 is positioned so that the lower surface of the joist connecting member 4 abuts on the upper surface of the upper flange 1 a of the beam 1. The joist connecting member 4 is provided with a pair of first through holes 4a penetrating vertically in the joist unit 2 at predetermined intervals in the longitudinal direction thereof. A plate washer 8 having a second through hole 8a having the same diameter as the first through hole 4a on the upper surface of the joist connecting member 4 and having a cross section substantially larger than the second through hole 8a is provided. , Are placed in each of the paired first through holes 4a.
On the other hand, in the present embodiment, a plurality of threaded bolts 9 and a pair of nuts 7 are used for the bearing connection means 5, and a web 1 b is sandwiched between the upper flange 1 a of the beam 1. A third through-hole 1c is provided at a position that is paired in the width direction and is coaxial with the first through-hole 4a in a vertical shape. The lower surface of the upper flange 1a is also provided with a plate washer 8 in which the second through hole 8a is positioned so as to be coaxial with the third through hole 1c in the vertical direction.
[0025]
These are arranged in pairs such that the threaded bolts 9 sandwich the third through hole 1c provided in the upper flange 1a of the beam 1, the first through hole 4a of the joist connecting member 4, and the like. In a state of being penetrated by four of the second through holes 8a of the plate washer 8, the upper flange 1a of the beam 1, the joist connecting member 4 of the joist unit 2, and the plate washer 8 forming a pair are perpendicular to the four members. The nut 7 is fitted and fastened to both ends of the threaded bolt 9 so that a compressive force in the direction acts.
The third through hole 1c provided in the upper flange 1a of the beam 1 may be formed as a long hole, and a fine adjustment may be made when the beam 1 and the joist unit 2 are aligned. good.
[0026]
(Third embodiment)
As shown in FIG. 3B, the joist unit 2 placed on the beam 1 is positioned such that the lower surface of the joist connecting member 4 abuts on the upper surface of the upper flange 1a of the beam 1 face to face. The first through-hole 4a and the third through-hole 1c as shown in the first and second embodiments are provided in the joist connecting member 4 and the upper flange 1a of the beam 1. Not. The writing plate washer 8 is not used.
On the other hand, a pair of L-shaped steel 10 and a long bolt 11 are used for the bearing connection means 5, and the long bolt 11 has a member length of the joist connecting member 4 and the beam height of the beam 1. Is formed to a length longer than the sum of the heights. The L-shaped steel 10 is formed such that its member length is longer than the beam width of the beam 1.
In the case where the bearing connection means 5 according to the present embodiment is employed, the beam 1 needs to have a horizontal flange also on the lower surface. In this embodiment, the H-shaped steel is used. As long as the lower surface has a horizontal surface, a steel material having another cross-sectional shape may be used.
[0027]
The pair of L-shaped steel members 10 make contact with each other on the upper surface of the joist connecting member 4 and the lower surface of the beam 1, and make the length direction parallel to the width direction of the beam 1. They are arranged so as to be coaxial in the vertical direction. The pair is formed such that a vertical compressive force is applied to both the beam 1 and the joist connecting member 4 of the joist unit 2 via the pair of L-shaped steels 10 arranged coaxially in the vertical direction. The long bolt 11 is fastened after the plate washer 8 shown in the second embodiment is arranged at each of both opposite ends of the L-shaped steel 10.
Note that the L-shaped steel 10 is not necessarily limited to this, as long as the L-shaped steel 10 has a rigidity that is not deformed by an out-of-plane force generated by the configuration in which the long bolts 11 are arranged at both ends as described above. Alternatively, another member such as a steel plate may be used.
[0028]
(Fourth embodiment)
As shown in FIG. 4A, in the present embodiment, similarly to the third embodiment, the joist unit 2 placed on the beam 1 has a lower surface of the joist connecting member 4. Only the upper flange 1a is positioned so as to abut against the upper surface of the upper flange 1a, and the joist connecting member 4 and the upper flange 1a of the beam 1 have the same structure as described in the first and second embodiments. Neither the first through hole 4a nor the third through hole 1c is provided, and the plate washer 8 is not used.
On the other hand, an L-shaped steel 10 and a pair of bolts 15 with hooks are used as the bearing connection means 5, and the L-shaped steel 10 has a member length similar to that of the beam in the third embodiment. It is formed longer than one beam width. Further, the hooked bolt 15 is an apparent J-shaped bolt in which the folded length of the other end 15b is shorter than that of the one end 15a. The hooked bolt 15 has a smooth surface formed at the tip end of the other end 15b, and the length of the one end 15a from the folded portion is the length of the other end 15b, the length of the joist connecting member 4 and the beam 1 The upper flange 1a is formed to be longer than the sum of the three member heights.
[0029]
These are connected in a state where the joist unit 2 placed on the beam 1 is positioned so that the lower surface of the joist connecting member 4 abuts on the upper surface of the upper flange 1a of the beam 1 face to face. The L-shaped steel 10 is arranged on the upper surface of the material 4 such that the L-shaped steels 10 are in contact with each other and the length direction is parallel to the width direction of the beam 1. The tip of the other end 15b of the bolt 15 with a hook is used to apply a vertical compressive force to both the upper flange 1a of the beam 1 and the joist connecting member 4 of the joist unit 2 using these L-shaped steels 10. The hooked bolts 15 are arranged in pairs so that the portions abut against the back surfaces of both sides of the upper flange 1 a of the beam 1, and one end 15 a is provided near each of both ends of the L-shaped steel 10. In addition to passing through the hole 10a and arranging the plate washer 8 shown in the second embodiment, it is fastened via a nut.
[0030]
Note that, as described in the third embodiment, the L-shaped steel 10 is not necessarily limited to this, and the L-shaped steel 10 has an out-of-plane direction caused by the configuration in which the hooked bolts 15 are provided at both ends as described above. Other members, such as a steel plate, may be used as long as they have rigidity that does not deform even with force.
[0031]
(Fifth embodiment)
As shown in FIG. 4B, in the present embodiment, a pair of a fastening plate 12, an L-shaped steel 10, and a fastening means 13 are used as the bearing joining means 5.
The fastening plates 12 forming a pair are made of a steel plate having a member length higher than the member height of the joist connecting member 4 of the joist unit 2, and a stud dowel 12 a is provided on the back surface, and the stud dowel 12 a is connected to the joist connecting member. By being buried in the side of the member 4, it is integrally provided so as to abut on the side surface of the joist connecting member 4 face to face. These are provided at the same time when the joist unit 2 is manufactured in advance in a factory or the like. The fastening plate 12 is arranged so that the lower end portion protrudes vertically below the joist connecting member 4.
At this time, the joist connecting member 4 of the joist unit 2 is formed such that the member length in the length direction of the joist unit 2 is the same as the width of the upper flange 1 a of the beam 1.
[0032]
The joist unit 2 placed on the beam 1 sandwiches the upper flange 1 a of the beam 1 with fastening plates 12 provided on both sides of the joist connecting member 4. The lower surface is brought into contact with the upper surface of the upper flange 1a of the beam 1 face to face. Thereby, the pair of L-shaped steels 10 is arranged at each pair of corners formed by the fastening plate 12 and the back surface of the upper flange 1a of the beam 1 so that the surfaces come into contact with each other, and By fastening the L-shaped steel 10 and the fastening plate 12 via the fastening means 13, a vertical compressive force acts on both the upper flange 1 a of the beam 1 and the joist connecting member 4 of the joist unit 2. , To suppress the behavior in the horizontal direction.
[0033]
Note that the fastening plate 12 does not necessarily need to be fixed to the joist connecting member 4 of the joist unit 2 in advance, and as shown in FIG. A cap nut 14 is buried, and a fastening plate 12 provided with a hole 12b at a predetermined height is brought into contact with each other at the site, and a fastening means 13 is inserted into the hole 12b and the cap nut 14 at the site. Then, the fastening means 13 may be fixed to the cap nut 14 via the fixing means 16.
[0034]
According to the first to fifth embodiments described above, the upper flange 1a of the beam 1 which is coaxially located in the vertical direction and the joist connecting member 4 of the joist unit 2 abut against each other, and the bearing joining means is provided. In the first to fourth embodiments, the shear force from the joist unit 2 is applied to the plate washer 8 or the L-shaped steel 10 and the joist connecting material 4 and the joist connecting material. The friction generated on the contact surface between each of the upper flange 1a and the upper flange 1a of the beam 4 enables the beam to be smoothly transmitted to the beam 1. In the fifth embodiment, the shear force from the joist unit 2 is applied to the friction generated at the contact surface between the joist connecting member 4 and the upper flange 1 a of the beam 1, and to the side surface of the upper flange 1 a of the beam 1 and the fastening plate 12. Can smoothly transmit to the beam 1.
Furthermore, since a vertical compressive force acts on the joist connecting member 4 and the upper flange 1a of the beam 1 via the bearing joining means 5, it is possible to suppress the occurrence of micro-vibration that easily occurs in the joist unit 2. Become.
[0035]
Since the bearing connection means 5 does not use a fixing means such as welding, it is possible to shorten the construction period and reduce the construction cost due to the improvement of workability. In addition, since fire such as welding is not used, even when a new joist unit 2 is joined to the beam 1, temporary work for protecting a floor finish or the like that has already been performed can be omitted, so that workability is improved. Can be further improved.
[0036]
Further, in the first embodiment and the second embodiment, a first through hole 4a is provided in advance in the joist connecting member 4 of the joist unit 2 and the upper surface of the upper flange 1a of the beam 1 is formed. Since the stud bolt 6 or the third through hole 1c is previously set at a predetermined position which is coaxial on the vertical axis with the first through hole 4a, the joist unit 2 The positioning can be easily performed, and the working efficiency can be further improved.
[0037]
(Sixth embodiment)
In the first to fifth embodiments, the joining structure of the beam 1 and the joist unit 2 using the bearing joining means 5 has been described. In the sixth embodiment, the joist 3 is joined to the beam 1. The connection structure of the joist unit 2 adjacent in the length direction is shown.
As shown in FIG. 5A, the joist unit 2 is butt-joined to the upper flange 1a of the beam 1 via the butt-joining means 5 shown in the first embodiment. In these joist units 2, a plurality of joists 3 constituting the joist unit 2 are arranged so as to be continuous in the length direction. Opposing ends of the adjacent joists 3 are connected to the upper flange 1a of the beam 1. The end faces face each other on the upper surface. Opposite ends of such adjacent joists 3 are connected by a connection fitting 17 arranged so as to straddle both.
[0038]
As shown in FIG. 5B, the connecting bracket 17 is made of a U-shaped steel plate or a grooved steel cross section, and the inner peripheral surface is continuously in contact with the upper surface and the side surface of the joist 3. It has been molded. The connecting metal fitting 17 is disposed so as to cover the joist 3 from above, and is adhered via an adhesive 18 such as an epoxy resin, so that the adjacent joist 3 can be viewed from the cross-section of the opposing ends. And are connected near the upper part.
[0039]
Note that the connection metal fitting 17 is not necessarily limited to this, and has a width substantially similar to the width of the joist 3 and a length straddling both of the adjacent joists 3 as shown in FIG. A plate material such as a steel plate may be used. In other words, as long as the upper surfaces of the adjacent joists 3 can be connected, any shape of the connecting fitting 17 may be used.
Further, in this embodiment, the connection structure of the joist 3 is shown by taking the joist unit 2 shown in the first to fifth embodiments as an example, but the joist 3 is not necessarily the joist unit 2. It does not need to be configured, and may be used when a plurality of commonly used single joists 3 are connected in the length direction.
Further, the adhesive 18 may be any adhesive as long as it can join different members such as concrete and steel frame with sufficient adhesive strength.
[0040]
According to the above-described configuration, since the opposing ends of the adjacent joists 3 are connected to each other at the upper ends via the connecting fittings 17, the rotational rigidity of the two can be increased, and the fine jolts 3 are likely to be generated. Vibration can be prevented.
Further, since the connection fitting 17 and the joist 3 are only fixed by the adhesive 18, the connection by the cast-in-place concrete which has been generally used for the connection in the longitudinal direction of the adjacent joist 3 conventionally. The work can be made unnecessary, and it can greatly contribute to the reduction of the construction cost and the construction period.
Further, since the legs for supporting the grating later are arranged on the upper surface of the joist 3, if the legs are fixed on the upper surface of the connecting metal fitting 17 in advance, the whole structure for constructing the floor of the clean room is further improved. The construction period can be shortened.
[0041]
【The invention's effect】
According to the joint structure of the joist unit and the beam according to claim 1, the joint structure of the joist unit and the beam applied to the floor of a clean room having an opening for ventilation, wherein the beam has a horizontal surface at least on an upper surface. The joist unit is configured to be a steel frame made of a section steel having an upper flange to be formed, and the joist unit includes a plurality of joists spaced apart from each other at a predetermined interval so as to be orthogonal to the beam on the upper surface of the upper flange of the beam. The joists, which are orthogonal to the joists and whose lower end surfaces form the same horizontal plane as the lower end surfaces of the joists, are arranged at least at both end portions of the joists and at the same interval as the beams, and connect adjacent joists. And a connecting member, wherein the joist unit abuts the lower surface of the joist unit and the upper surface of the beam face-to-face via a bearing joining means, and applies a compressive force therebetween. Since it is joined to the beam, the shear force from the joist unit can be smoothly transmitted to the beam by friction generated at least on the contact surface of the joist connecting member and the upper flange of the beam, Since the compressive force in the vertical direction is acting on the joist unit and the beam by the bearing joining means, it is possible to suppress the occurrence of micro-vibration or the like which is likely to occur in the joist unit.
Further, since a fixing means such as welding is not used, it is possible to shorten a construction period and reduce a construction cost due to an improvement in workability.
Further, by not using fire such as welding, the work related to protection of the existing part can be omitted, and the work of mounting the joist unit can be performed while using the clean room.
[0042]
According to the joint structure of the joist unit and the beam according to claim 2 and claim 3, the bearing supporting means is constituted by a plurality of stud bolts provided on the upper surface of the beam and a nut fitted to the stud bolt. The joist connecting member of the joist unit is provided with a first through-hole that penetrates in the vertical direction, and the upper surface of the joist connecting member has a diameter similar to that of the first through-hole. A plate washer having a second through hole and made of a steel plate having a smaller area than the plan view shape of the joist connecting member is disposed so that the second through hole is coaxial with the first through hole of the joist connecting member. A plurality of the stud bolts are provided on the upper surface of the upper flange of the beam at positions vertically coaxial with the first through-hole of the joist connecting member and project vertically upward; The first through hole of the connecting material and the plate washer Is inserted into the second through-hole, the upper flange of the beam, the fastening plate of the joists unit, and to exert a compressive force on the three parties of the plate washer, the nut is fastened to the stud bolts.
[0043]
Alternatively, a plurality of through bolts and a pair of nuts instead of the stud bolts are used in the bearing connection means, and the upper flange of the beam is vertically aligned with the first through hole of the joist connecting member. A third through-hole is provided at a coaxial position, and the through-bolt is connected to the first through-hole of the joist connecting member, the second through-hole of the plate washer, and the third through-hole of the upper flange of the beam. Nuts are fastened to the vicinity of both ends of the through bolt so as to apply a compressive force to the upper flange of the beam, the fastening plate of the joist unit, and the plate washer.
[0044]
Thereby, the shear force from the joist unit can be smoothly transmitted to the beam by the friction generated on the contact surface between each of the plate washer and the joist connecting material, and the upper flange of the joist connecting material and the upper flange, Due to the compressive action in the vertical direction of the joist connecting member and the upper flange of the beam by the bearing joining means, it is possible to suppress the occurrence of micro-vibration that tends to occur in the joist unit.
A first through hole is provided in advance in the joist connecting member of the joist unit, and a predetermined position on the upper surface of the upper flange of the beam is coaxial with the first through hole on a vertical axis. Since the stud bolt or the third through hole is provided in advance at the position, the positioning of the joist unit can be easily performed, and the working efficiency can be further improved.
[0045]
According to the joint structure of a joist unit and a beam according to claim 4 or 5, a plurality of L-shaped steels paired with a long bolt and a nut are used for the bearing connection means, and the long bolt is used. Has a member length longer than the sum of the member heights of the joist connecting members constituting the beam and the joist unit, and the L-shaped steel has a member length longer than the member width of the beam, In a state where the joist unit is placed at a predetermined position on the upper surface of the beam, each of the pair of L-shaped steels has their length direction parallel to the width direction of the beam, and these are placed on the lower surface of the beam and the upper surface of the joist connecting member. And the opposite ends of a pair of L-shaped steel members, which are arranged so as to sandwich the same and abut against each other, so as to apply a vertical compressive force to the three members of the beam and the joist unit and the L-shaped steel member. Each part has a vertical long bolt It is fastened.
[0046]
Alternatively, the bearing connection means is composed of an L-shaped steel having a member length longer than the member width of the beam and a pair of bolts with hooks, and a joist unit is placed at a predetermined position on the upper surface of the beam. In this state, the L-shaped steel is placed on the upper surface of the joist connecting member so that the length direction is parallel to the width direction of the beam so as to abut against each other, and the upper flange of the beam and the joist connecting member of the joist unit; And one end of the bolt with a hook is in contact with the lower surface of each of both sides of the upper flange of the beam, and the other end is connected to both ends of the L-shaped steel so as to apply a compressive force to the three members of the L-shaped steel. Be concluded.
[0047]
Thereby, the shear force from the joist unit can be smoothly transmitted to the beam by the friction generated on the contact surfaces of the L-shaped steel and the joist connecting member, and between the joist connecting member and the upper flange of the beam. In addition, the vertical compression of the joist connecting member and the upper flange of the beam by the bearing joining means makes it possible to suppress the occurrence of micro-vibration that is likely to occur in the joist unit.
In addition, since the joist unit and the beam are configured using only the bearing connection means without adding a new configuration, the versatility is high with a simple configuration, and the workability is further improved. It becomes possible.
[0048]
According to the joint structure of the joist unit and the beam according to claim 6, the joist connecting member constituting the joist unit has the same width as the upper flange of the beam. A pair of fastening plates fixed via fixing means so as to be joined to both side surfaces of the joist connecting member face to face, and arranged so as to protrude downward from the joist connecting material and extend, An L-shaped steel to be formed and a plurality of fastening means are used, and the joist unit comprises a pair of fastening plates and a back surface of an upper flange of the beam, which are formed by being placed at predetermined positions on the upper surface of the beam. The L-shaped steel is disposed so as to abut against each other at each pair of corners, and the L-shaped steel and a fastening plate are fastened via the fastening means.
[0049]
Thereby, the shear force from the joist unit is smoothly transmitted to the beam by the friction generated on the contact surface between the joist connecting member and the upper flange of the beam and the contact between the side surface of the upper flange of the beam and the fastening plate. Becomes possible.
Further, since a pair of fastening plates fixed to both side surfaces of the joist connecting member of the joist unit are arranged so as to sandwich the upper flange of the beam, positioning of the joist unit with respect to the beam can be easily performed. Thus, the working efficiency can be further improved.
[0050]
According to the joint structure of the joist according to claim 7 and claim 8, a plurality of joists applied to the floor of a clean room having an opening for ventilation and installed so as to be orthogonal to the beam are provided in the length direction. A joist connection structure in which the end portions facing each other are connected to each other via connection metal fittings arranged so as to cover at least the upper surfaces of the both ends. A steel material having a U-shaped cross section is used, and the connecting metal fittings are arranged so as to cover at least a part of the upper surface and the side surface of the joist, so as to straddle opposed ends of adjacent joists, and are bonded. Glued through means.
[0051]
Alternatively, a steel plate having a width similar to the width of the joist is used for the connecting hardware, and the connecting metal is straddled between opposing ends of adjacent joists so as to cover an upper surface of the joist. Since they are arranged and adhered via the adhesive means, the rotational rigidity of each of the opposed end portions of the adjacent joists can be increased, and it becomes possible to prevent micro-vibrations that easily occur in the joists.
[0052]
In addition, since the connection fitting and the joist are only fixed by a resin adhesive, the connection work using cast-in-place concrete, which has been generally used for the connection in the longitudinal direction of the adjacent joist, is conventionally used. This can be unnecessary, and can greatly contribute to the reduction of the construction cost and the construction period.
Furthermore, since the legs that support the grating are later placed on the upper surface of the joists, if the legs are fixed to the upper surface of the connecting bracket in advance, the overall construction time when constructing the floor of the clean room can be further shortened. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a joint structure between a joist unit and a beam according to the present invention.
FIG. 2 shows a plan view and a side view of a joint structure of a joist unit and a beam according to the present invention.
FIG. 3 shows another example of the joint structure between a joist unit and a beam according to the present invention (part 1).
FIG. 4 shows another example of the joint structure between a joist unit and a beam according to the present invention (part 2).
FIG. 5 shows a connection structure of joists adjacent in the length direction according to the present invention.
[Explanation of symbols]
1 beam
1a Upper flange
1b Web
1c Third through hole
2 joist unit
3 joists
4 joist connecting material
4a First through hole
5 Supporting means
6 stud bolts
7 nuts
8 Sheet washer
8a Second through hole
9 Screw bolts
10 L-type steel
10a hole
11 long bolt
12 Fastening plate
12a stud dowel
12b hole
13 fastening means
14 Cap nut
15 Bolt with hook
16 Fixing means
17 Connecting bracket
18 Adhesive

Claims

A joint structure of a joist unit and a beam applied to a clean room floor having an opening for ventilation,
The beam is configured in a steel structure made of a mold steel having an upper flange that forms a horizontal surface at least on an upper surface,
The plurality of joists, wherein the joist units are spaced apart from each other at a predetermined interval so as to be orthogonal to the beams on the upper surface of the upper flange of the beams,
At right angles to the joist, the lower end surface forms the same horizontal plane as the lower end surface of the joist, and at least both end portions of the joist and a plurality of joists are arranged at the same interval as the beam, and the joist connection connects adjacent joists. Material and
The joist unit is brought into contact with the beam by means of abutment joining in which the lower surface of the joist unit and the upper surface of the beam are abutted face to face via a bearing joining means, and a compressive force acts between the two. A distinctive joint structure between joists and beams.

The joint structure between a joist unit and a beam according to claim 1,
The bearing joining means is constituted by a plurality of stud bolts provided on the upper surface of the beam, and a nut fitted to the stud bolt,
The joist connecting member of the joist unit is provided with a first through hole penetrating in a vertical direction,
A plate washer made of a steel plate having a second through-hole having a diameter similar to that of the first through-hole on the upper surface of the joist connecting member, and having a smaller area than the plan view shape of the joist connecting member, The through hole is arranged to be coaxial with the first through hole of the joist connecting member,
A plurality of stud bolts are provided on the upper surface of the upper flange of the beam, projecting vertically upward, at positions vertically coaxial with the first through hole of the joist connecting member,
The stud bolt is inserted through the first through hole of the joist connecting member and the second through hole of the plate washer, and compresses the upper flange of the beam, the fastening plate of the joist unit, and the plate washer. The joint structure between a joist unit and a beam, wherein the nut is fastened to a stud bolt so as to act.

The joint structure between a joist unit and a beam according to claim 2,
In the bearing connection means, a plurality of through bolts and a pair of nuts are used instead of the stud bolts,
In the upper flange of the beam, a third through-hole is provided at a position that is coaxial in a vertical direction with the first through-hole of the joist connecting member,
The through bolt is inserted through the first through hole of the joist connecting member, the second through hole of the plate washer, and the third through hole of the upper flange of the beam,
A nut is fastened near each end of a through bolt so as to apply a compressive force to an upper flange of the beam, a fastening plate of the joist unit, and a plate washer. Joint structure.

The joint structure between a joist unit and a beam according to claim 1,
In the bearing connection means, a plurality of L-shaped steel pairs with long bolts and nuts are used,
The long bolt has a member length longer than a length obtained by adding the member heights of the joist connecting members constituting the beam and the joist unit,
The L-shaped steel has a member length longer than the member width of the beam,
In a state where the joist unit is placed at a predetermined position on the upper surface of the beam, each of the paired L-shaped steels has its length direction parallel to the width direction of the beam, and on the lower surface of the beam and the upper surface of the joist connecting member, It is arranged so as to sandwich these and abut each other,
Vertical long bolts are fastened to opposite ends of the pair of L-shaped steel members so as to apply a vertical compressive force to the beam, the joist connecting member of the joist unit, and the L-shaped steel member. Joint structure of joist unit and beam characterized by that.

The joint structure between a joist unit and a beam according to claim 1,
The bearing connection means is composed of an L-shaped steel having a member length longer than the member width of the beam, and a pair of bolts with hooks,
In a state where the joist unit is placed at a predetermined position on the upper surface of the beam, the L-shaped steel is placed on the upper surface of the joist connecting member such that the length direction is parallel to the width direction of the beam and the L-shaped steels abut against each other. Being
One end of the bolt with a hook was abutted on the lower surface of each of both sides of the upper flange of the beam so as to apply compressive force to the upper flange of the beam, the joist connecting member of the joist unit, and the L-shaped steel. The joint structure between the joist unit and the beam, wherein the other end is fastened to both ends of the L-shaped steel in the state.

The joint structure between a joist unit and a beam according to claim 1,
The joist connecting member constituting the joist unit has the same width as the upper flange of the beam,
The bearing joining means includes a pair fixed to the both sides of the joist connecting member via fixing means so as to be joined face to face, and arranged so as to protrude and extend below the joist connecting material. A fastening plate to be formed,
A pair of L-shaped steel and a plurality of fastening means are used, and the joist unit is formed by being placed at a predetermined position on the upper surface of the beam. The L-shaped steel is disposed so as to abut against each other at each pair of corners,
A joint structure between a joist unit and a beam, wherein the L-shaped steel and a fastening plate are fastened via the fastening means.

Applied to the floor of a clean room having an opening for ventilation, a plurality of joists installed to be orthogonal to the beams are continuously arranged in the length direction,
Opposite ends are connected structures of joists connected via connecting metal fittings arranged so as to cover at least the upper surfaces of both,
For the connection fitting, a steel material having a U-shaped cross section is used,
The joist unit, wherein the connecting metal fittings are arranged so as to cover at least a part of the upper surface and the side surface of the joist, and straddle opposed ends of adjacent joists, and are adhered via an adhesive means. Connection structure.

The connection structure of a joist unit according to claim 7,
A steel plate having a width similar to the width of the joist is used for the connecting hardware, and the connecting hardware is arranged so as to straddle the opposing ends of the adjacent joists so as to cover the upper surface of the joists. And a joint structure of the joist units, wherein the joist units are bonded through bonding means.