JP2004036276A

JP2004036276A - Coupler and connecting structural body

Info

Publication number: JP2004036276A
Application number: JP2002196258A
Authority: JP
Inventors: Toshiya Morita; 森田　俊哉; Yutaka Iizuka; 飯塚　豊
Original assignee: Kaieitechno Co Ltd
Current assignee: Kaieitechno Co Ltd
Priority date: 2002-07-04
Filing date: 2002-07-04
Publication date: 2004-02-05

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupler which simply and nicely connects concrete parts to each other. <P>SOLUTION: The coupler includes: a male coupler 1 having a male screw section 1a on the outside thereof and a female screw hole 1b screwable to a male screw section ET1 of a connecting rod CR1 from one end to the other end; a female coupler 2 having a female screw hole 2a screwable to the outside male screw section 1a of the male coupler 1 from one end to the other end, having an insertion-hole 2b from the other end to the female screw hole 2a for inserting a male screw section ET2 of a connecting rod CR2 at a clearance and having an interlocking section 2c in a boundary part between the female screw hole 2a and the insertion-hole 2b; and a controlling nut 3 for controlling the movement of the female coupler 2 in conjunction with the interlocking section 2c screwed on the male screw section ET2 of the connecting rod CR2 after the female coupler 2 has been fitted to the male screw section ET2 of the connecting rod CR2 from the outside through the insertion-hole 2b. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、コンクリート部品を相互連結するための連結器と、この連結器を用いてコンクリート部品を相互連結することにより構成された連結構造体に関する。
【０００２】
【従来の技術】
水路や擁壁等のコンクリート構造物は、工場において製作されたコンクリート部品を現場に搬入し、これを現場において適宜連結することによって組み立てられている。
【０００３】
前記の連結には一般に溶接或いは連結器を用いた手法が用いられていることから、コンクリート部品には鋼材から成る連結ロッドがその端部がコンクリート部品の連結面近傍で露出するように設けられている。溶接によりコンクリート部品を相互連結するときには、コンクリート部品相互の連結面を組み合わせた状態で相対する連結ロッドの端部を溶接により結合する。
【０００４】
連結器を用いた連結手段の一例としては、特開昭６３−１１８４３３号公報に開示されたものがある。同公報に開示されている連結器は、一方のコンクリート部材から突出する鋼棒に設けられた雄ネジ付きカプラ−と、他方のコンクリート部材から突出する鋼棒に設けられた雌ネジ付きカプラ−とを有しており、両カプラ−を螺合する途中で各カプラ−をそれぞれが取付けられた鋼棒のヘッド部に係合させることにより両鋼棒に引き寄せ力を生じさせてコンクリート部品の連結を行う。
【０００５】
【発明が解決しようとする課題】
しかし、従来の溶接による連結手段及び方法では、相対する連結ロッドの軸線が僅かにずれているだけで溶接による結合品質にばらつきが生じると共に、環境条件や溶接作業者の能力によっても溶接による結合品質にばらつきが生じる不具合がある。また、連結部分に水密性や気密性を得るにはコンクリート部品の相互連結面に荷重を加えた状態で溶接を行う必要があるが、コンクリート部品の形状や連結向き等の関係から荷重を加えることが困難或いは不可能な場合には希望する水密性や気密性を有するコンクリート構造物を得ることができない。
【０００６】
また、前述の連結器によるものでは、カプラ−の移動を制限するためのヘッド部が鋼棒に一体成形されているため、コンクリート部品に鋼棒を埋設する際にカプラ−を鋼棒に予め装着しておく必要がある。つまり、コンクリート部品には鋼棒だけでなくカプラ−をも装着されているため、コンクリート部品を輸送するときや組み立てるときにカプラ−が邪魔になると共に、カプラ−及び鋼棒に変形や損傷を生じる場合がある。
【０００７】
この不具合を解消するには、前述のヘッド部をナットとし、鋼棒の先端にこのナットが螺合可能な雄ネジ部を形成して、ヘッド部を鋼棒に対して着脱自在とすれば、コンクリート部品に装着された鋼棒にカプラ−を適宜取付けることができる。しかしながら、このような構成を採用すると、両カプラ−を螺合するときにおいてカプラ−がナットに係合した後にナットがカプラ−と供回りして鋼棒におけるナットの適正な取付位置にズレを生じてしまう恐れがある。とりわけ、水路や擁壁等のコンクリート構造物にあっては隣接するコンクリート部品を高強度で連結する必要があることから、前記のような供回りが発生すると適正な引き寄せ力を鋼棒に生じさせることが難しくなり、結果として初期の連結強度が得られなくなってしまう。また、前述の供回りを防止するために両カプラ−を螺合する前工程で溶接や接着等の手法により予めナットを鋼棒に固着しておくことも考えられるが、現場における作業時間が増加するとともに固着のための設備が必要となりコストが嵩んでしまう。
【０００８】
本発明は前記事情に鑑みて創作されたもので、その目的とするところは、コンクリート部品の連結に所期の連結強度を確実に得ることができる連結器と、コンクリート部品が適正な強度状態で相互連結された連結構造体を提供することにある。
【０００９】
【課題を解決するための手段】
前記目的を達成するため、本発明の連結器は、連結ロッドがその先端の雄ねじ部が露出するように埋設されたコンクリート部品を相互連結するときに用いられる連結器であって、雄ねじ部を外面に有し、連結ロッドの雄ねじ部に螺合可能な雌ねじ穴を一端から他端に向けて有する雄カプラーと、雄カプラーの外面雄ねじ部に螺合可能な雌ねじ穴を一端から他端に向けて有し、連結ロッドの雄ねじ部が遊びをもって挿通可能な挿通孔を他端から雌ねじ穴に達するように有し、雌ねじ穴と挿通孔との境界部分に係止部を有する雌カプラーと、外面からその雌ねじ孔に達する孔を少なくとも１つ有し、雌カプラーをその挿通孔を通じて連結ロッドの雄ねじ部に外嵌した後に連結ロッドの雄ねじ部に螺合されて雌カプラーの移動を係止部との協働によって制限し得る制限ナットと、制限ナットを連結ロッドの雄ねじ部に螺合した後に制限ナットの孔に差し込まれて制限ナットを連結ロッドの雄ねじ部に固定するナット固定具とを備える、ことをその特徴とする。
【００１０】
この連結器によれば、一方のコンクリート部品の凹部内の雄ねじ部に雄カプラーの雌ねじ穴を螺合し、他方のコンクリート部品の凹部内の雄ねじ部に挿通孔を通じて雌カプラーを外嵌し外嵌後に雄ねじ部に螺合した制限ナットをナット固定具により適正位置に固定した後に、コンクリート部品相互の連結面を組み合わせた状態で雌カプラーを雄カプラーに螺合することによって、相対する連結ロッドに引き寄せ力を付与してコンクリート部品の相互連結を行う。制限ナットには外面からその雌ねじ孔に達する孔を少なくとも１つ形成されていて、制限ナットを連結ロッドの雄ねじ部に螺合した後に制限ナットの孔に差し込まれて制限ナットを連結ロッドの雄ねじ部に固定するナット固定具を備えているので、雄カプラ−と雌カプラ−とを螺合する過程において雌カプラ−の係止部が制限ナットに当接した後に雌カプラ−をさらに締め付けても、制限ナットは雌カプラ−と供回りすることはなく、制限ナットの螺合位置にズレを生じることもない。
【００１１】
一方、本発明の連結構造体は、連結面と連結面と隣接する面に開口を有する凹部と、先端の雄ねじ部が凹部内で露出するように部品内部に埋設された連結ロッドとを有するコンクリート部品と、コンクリート部品を連結面を介して組み合わせた状態で相対する連結ロッドに引き寄せ力を付与してコンクリート部品を相互連結する連結器とを備え、前記連結器は、雄ねじ部を外面に有し、連結ロッドの雄ねじ部に螺合可能な雌ねじ穴を一端から他端に向けて有する雄カプラーと、雄カプラーの外面雄ねじ部に螺合可能な雌ねじ穴を一端から他端に向けて有し、連結ロッドの雄ねじ部が遊びをもって挿通可能な挿通孔を他端から雌ねじ穴に達するように有し、雌ねじ穴と挿通孔との境界部分に係止部を有する雌カプラーと、外面からその雌ねじ孔に達する孔を少なくとも１つ有し、雌カプラーをその挿通孔を通じて連結ロッドの雄ねじ部に外嵌した後に連結ロッドの雄ねじ部に螺合されて雌カプラーの移動を係止部との協働によって制限し得る制限ナットと、制限ナットを連結ロッドの雄ねじ部に螺合した後に制限ナットの孔に差し込まれて制限ナットを連結ロッドの雄ねじ部に固定するナット固定具とから成り、この連結器の雄カプラーは一方のコンクリート部品の凹部内の雄ねじ部に雌ねじ穴を螺合することにより取り付けられ、雌カプラーは他方のコンクリート部品の凹部内の雄ねじ部にその挿通孔を通じて外嵌し外嵌後に雄ねじ部に制限ナットを螺合することにより取り付けられ、制限ナットはナット固定具により雄ねじ部に固定されていて、コンクリート部品相互の連結面を組み合わせた状態で雌カプラーを雄カプラーに螺合することによって相対する連結ロッドに引き寄せ力を付与してコンクリート部品を相互連結している、ことをその特徴とする。
【００１２】
この連結構造体によれば、一方のコンクリート部品の凹部内の雄ねじ部に雄カプラーの雌ねじ穴を螺合し、他方のコンクリート部品の凹部内の雄ねじ部に挿通孔を通じて雌カプラーを外嵌し外嵌後に雄ねじ部に螺合した制限ナットをナット固定具により適正位置に固定した後に、コンクリート部品相互の連結面を組み合わせた状態で雌カプラーを雄カプラーに螺合することによって、相対する連結ロッドに引き寄せ力を付与してコンクリート部品が適正な強度状態で相互連結されている。
【００１３】
本発明の前記目的とそれ以外の目的と、構成特徴と、作用効果は、以下の説明と添付図面によって明らかとなる。
【００１４】
【発明の実施の形態】
図１〜図７は本発明の一実施形態を示す。図１中のＰＣ１は第１コンクリート部品、ＰＣ２は第２コンクリート部品、１は雄カプラー、２は雌カプラー、３は制限ナット、４は止めねじである。
【００１５】
第１，第２コンクリート部品ＰＣ１，ＰＣ２は水路や擁壁等のコンクリート構造物を構築するためのプレキャストコンクリート部品である。また、雄カプラー１，雌カプラー２，制限ナット３及び止めねじ４によって、第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２とを相互連結するための連結器が構成されている。
【００１６】
第１コンクリート部品ＰＣ１には、連結面ＰＣ１ａと連結面ＰＣ１ａと隣接する面に開口を有する凹部ＦＰ１が、連結面ＰＣ１ａに沿って１乃至複数個形成されている。第１コンクリート部品ＰＣ１が大型の場合には、連結面ＰＣ１ａと隣接する２つの対向面それぞれに凹部ＦＰ１を設けるようにしても構わない。また、第１コンクリート部品ＰＣ１の内部には、先端に雄ねじ部ＥＴ１を有する鋼材製の連結ロッドＣＲ１が凹部ＦＰ１の数に相当する数埋設されており、連結ロッドＣＲ１の雄ねじ部ＥＴ１は凹部ＦＰ１内で露出している。図面には、第１コンクリート部品ＰＣ１との密着力を高めて連結ロッドＣＲ１の引っ張り強度を高めるために表面に凸部または凹部が形成されたものを連結ロッドＣＲ１として示してあるが、凸部または凹部を表面に有しないものを連結ロッドＣＲ１として用いても構わない。また、連結ロッドＣＲ１は第１コンクリート部品ＰＣ１の内部に埋設された鉄筋に溶接やワイヤー結線等によって結合されていてもよい。さらに、内部鉄筋の主筋として先端に雄ねじ部を有する長めのものを用い、この主筋の雄ねじ部を凹部ＦＰ１内で露出させることで連結ロッドＣＲ１の代わりとしてもよい。
【００１７】
第２コンクリート部品ＰＣ２には、連結面ＰＣ２ａと連結面ＰＣ２ａと隣接する面に開口を有する凹部ＦＰ２が、連結面ＰＣ２ａに沿って１乃至複数個形成されている。第２コンクリート部品ＰＣ２が大型の場合には、連結面ＰＣ２ａと隣接する２つの対向面それぞれに凹部ＦＰ２を設けるようにしても構わない。この凹部ＦＰ２の大きさ及び位置は第１コンクリート部品ＣＰ１の凹部ＦＰ１の大きさ及び位置とほぼ一致している。また、第１コンクリート部品ＰＣ２の内部には、先端に雄ねじ部ＥＴ２を有する鋼材製の連結ロッドＣＲ２が凹部ＦＰ２の数に相当する数埋設されており、連結ロッドＣＲ２の雄ねじ部ＥＴ２は凹部ＦＰ２内で露出している。図面には、第２コンクリート部品ＰＣ２との密着力を高めて連結ロッドＣＲ２の引っ張り強度を高めるために表面に凸部または凹部が形成されたものを連結ロッドＣＲ２として示してあるが、凸部または凹部を表面に有しないものを連結ロッドＣＲ２として用いても構わない。また、連結ロッドＣＲ２は第２コンクリート部品ＰＣ２の内部に埋設された鉄筋に溶接やワイヤー結線等によって結合されていてもよい。さらに、内部鉄筋の主筋として先端に雄ねじ部を有する長めのものを用い、この主筋の雄ねじ部を凹部ＦＰ２内で露出させることで連結ロッドＣＲ２の代わりとしてもよい。
【００１８】
雄カプラー１は全体が略円柱状で、その外面には、雄ねじ部１ａが上端から下端に向かって形成されている。また、雄カプラー１の下端面中央には、連結ロッドＣＲ１の雄ねじ部ＥＴ１に螺合可能な雌ねじ穴１ｂが下端から上端に向かって形成されている。さらに、雄カプラー１の上面には、第２コンクリート部品ＰＣ２の連結ロッドＣＲ２がぶつかることを回避するための窪み１ｃが形成されている。さらに、雄カプラー１の外面の雄ねじ部１ａ下側には、環状の鍔部１ｄと、工具係合部１ｅが形成されている。図面には、雄カプラー１の下端面周囲に等角度間隔で並ぶ複数の凹部から構成されたものを工具係合部１ｅとして示してあるが、６角形部分や４角形部分等を工具係合部１ｅとしてもよい。
【００１９】
雌カプラー２は全体が略円柱状で、その下端面中央には、雄カプラー１の雄ねじ部１ａが螺合可能な雌ねじ穴２ａが下端から上端に向かって形成されている。図面には、雌ねじ穴２ａとしてその上部に非ねじ部分を有するものを示してあるが、全体に雌ねじが刻設されていても構わない。また、雌カプラー２の上端中央には、連結ロッドＣＲ２の雄ねじ部ＥＴ２が遊びをもって挿通可能な挿通孔２ｂが上端から雌ねじ穴２ａに達するように形成されている。この挿通孔２ｂの径は、連結ロッドＣＲ２の雄ねじ部ＥＴ２の径よりも大きく、且つ、制限ナット３の径よりも小さい。さらに、雌カプラー２の雌ねじ穴２ａと挿通孔２ｂとの境界部分には、環状面によって構成された係止部２ｃが形成されている。さらに、雌カプラー２には、外面から雌ねじ穴２ａに達する貫通孔２ｄが１個または周方向に間隔をおいて複数個形成されている。この貫通孔２ｄは止めねじ４を制限ナット３の雌ねじ孔３ａにねじ込むための工具を外部から挿入するためのもので、その形状は円形以外の楕円形や多角形であってもよいし、その大きさはねじ込み工具が挿入できる最小限のもので十分である。貫通孔２ｄの数は１個であっても構わないが、雄カプラー１に対する雌カプラー２の螺合が完了した状態における雌カプラー２の向きによっては後述する硬化材注入作業を行えなくなる恐れがあるので、貫通孔２ｄは２個以上設けることが好ましい。さらに、雌カプラー２の外部上端には、工具係合部２ｅが形成されている。図面には、雌カプラー２の上端面周囲に等角度間隔で並ぶ複数の凹部から構成されたものを工具係合部２ｅとして示してあるが、６角形部分や４角形部分等を工具係合部２ｅとしてもよい。
【００２０】
制限ナット３は６角ナットから成り、その径は、雌カプラー２の雌ねじ穴２ａの径よりも小さく、且つ、挿通孔２ｂの径よりも大きい。また、制限ナット３には、外面からその雌ねじ孔（符号無し）に達する雌ねじ孔３ａが形成されている。この雌ねじ孔３ａの形成位置は任意であり、図２Ａに示す角部や図２Ｂに示す平面部に形成してもよい。雌ねじ孔３ａの数は１個であっても構わないが、雄ねじ部ＥＴ２に螺合された制限ナット３の向きによっては後述するねじ込み工具による止めねじ４のねじ込み作業が行えなくなる恐れがあるので、雌ねじ孔３ａは図２Ａと図２Ｂに示すように２個設けるか図２Ｃ及び図２Ｄに示すように３個設けることが好ましい。勿論、制限ナット３には４個以上の雌ねじ孔３ａを設けるようにしてもよい。
【００２１】
止めねじ４は全体が円柱状で、その外面には、制限ナット３の雌ねじ孔３ａに螺合可能な雄ねじ部（符号無し）が形成されている。また、止めねじ４の一端部には、マイナス溝やプラス溝や６角凹部等から成る工具係合部（符号無し）が形成されている。
【００２２】
前記の雄カプラー１は第１，第２コンクリート部品ＰＣ１，ＰＣ２の一方の連結ロッドの露出部分（雄ねじ部）に取り付けられ、雌カプラー２は第１，第２コンクリート部品ＰＣ１，ＰＣ２の他方の連結ロッドの露出部分（雄ねじ部）に取り付けられる。
【００２３】
図３に示すように第１コンクリート部品ＰＣ１の連結ロッドＣＲ１に雄カプラー１を取り付ける場合には、連結ロッドＣＲ１の雄ねじ部ＥＴ１にロックナットＲＮを螺合して最深部に位置させ、次に、雄ねじ部ＥＴ１に雄カプラー１の雌ねじ穴１ｂを螺合する。
【００２４】
また、図４に示すように第２コンクリート部品ＰＣ２の連結ロッドＰＣ２に雌カプラー２を取り付ける場合には、連結ロッドＰＣ２の雄ねじ部ＥＴ２にロックナットＲＮを螺合して最深部に位置させ、次に、雄ねじ部ＥＴ２に雌カプラー２を挿通孔２ｂを通じて外嵌する。次に、雌カプラー２を持ち上げた状態で、止めねじ４を仮止めした制限ナット３を雄ねじ部ＥＴ２に螺合する。雄ねじ部ＥＴ２に制限ナット３を螺合するときには、制限ナット３に仮止めされている止めねじ４が外側（図４中左側）に向くようにする。
【００２５】
そして、図５に示すように、雌カプラー２を図４の位置よりも下げ、必要に応じて雌カプラー２を回して、雌カプラー２の貫通孔２ｄを制限ナット３に仮止めされている止めねじ４と位置合わせする。次に、止めねじ４の工具係合部に適合したねじ込み工具を雌カプラー２の外側から貫通孔２ｄに挿入し、挿入されたねじ込み工具によって止めねじ４を強くねじ込んで制限ナット３を雄ねじ部ＥＴ２に固定する。
【００２６】
第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２とを相互連結するときには、図６に示すように、第１コンクリート部品ＰＣ１の連結面ＰＣ１ａと第２コンクリート部品ＰＣ２の連結面ＰＣ２ａを図示省略のパッキンを介して組み合わせる。第１コンクリート部品ＰＣ１の凹部ＦＰ１と第２コンクリート部品ＰＣ２の凹部ＦＰ１との位置はほぼ一致しているため、互いの連結面ＰＣ１ａとＰＣ２ａを組み合わせた状態では、凹部ＦＰ１内で露出する雄ねじ部ＥＴ１の軸線ＣＬ１と凹部ＦＰ２内で露出する雄ねじ部ＥＴ２の軸線ＣＬ２とはほぼ一直線となる。
【００２７】
次に、雄カプラー１を指先で保持した状態で、雌カプラー２を指先で回してその雌ねじ穴２ａを雄カプラー１の雄ねじ部１ａに螺合する。指先による螺合が困難になったところで、雄カプラー１の工具係合部１ｅにこれに適合した締付工具を係合して保持した状態で、雌カプラー１の工具係合部２ｅにこれに適合した締付工具を係合して雄カプラー１に対する雌カプラー２の螺合を継続する。
【００２８】
これにより、雄カプラー１を通じて第１コンクリート部品ＰＣ１の連結ロッドＣＲ１に太線矢印で示す引き寄せ力が付与されると共に、雌カプラー２及び係止部２ｃに係合した制限ナット３を通じて第２コンクリート部品ＰＣ２の連結ロッドＣＲ２に太線矢印で示す引き寄せ力が付与され、第１コンクリート部品ＰＣ１の連結面ＰＣ１ａと第２コンクリート部品ＰＣ２の連結面ＰＣ２ａとがパッキンを介して圧接し、同圧接状態のまま第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２とが連結される。
【００２９】
雌カプラー２の挿通孔２ｂとこの挿通孔２ｂに挿入された雄ねじ部ＥＴ２との間には環状の隙間（遊び）が存在し、この遊びによって雌カプラー２の位置を雄ねじ部ＥＴ２の軸線ＣＬ２と直交する方向に微調整できるので、第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２を組み合わせた状態で雄ねじ部ＥＴ１の軸線ＣＬ１と雄ねじ部ＥＴ２の軸線ＣＬ２とにずれがある場合でも、前記の遊びを利用して雄カプラー１に対する雌カプラー２の螺合を適切に行える。
【００３０】
また、螺合時における雌カプラー２の移動量を係止部２ｃが制限ナット３に接することで制限するようにし、しかも、この制限ナット３を止めねじ４によって連結ロッドＣＲ２の雄ねじ部ＥＴ２に固定してあるので、雌カプラー２を雄カプラー１に螺合するときに制限ナット３の螺合位置が供回り等の影響でずれることを確実に防止して、先に述べた雄カプラー１に対する雌カプラー２の螺合による第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２との相互連結を的確に行える。
【００３１】
雄カプラー１に対する雌カプラー２の螺合作業が完了した後は、雄カプラー１側のロックナットＲＮをレンチ等の締付工具を用いて締め上げて雄カプラー１に圧接させると共に、雌カプラー２側のロックナットＲＮをレンチ等の締付工具を用いて締め上げて雌カプラー２に圧接させる。この後は、雌カプラー２の貫通孔２ｄから連結器内の空間にエポキシ樹脂系等の硬化材を注入し、そして、互いに連続した凹部ＦＰ１内と凹部ＦＰ２内にモルタル等の硬化材を充填する。以上で、第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２とが相互連結され、同作業を繰り返すことで水路や擁壁等のコンクリート構築物が構築される。
【００３２】
このように、前述の実施形態によれば、雄カプラー１を第１コンクリート部品ＰＣ１の連結ロッドＰＣ１に取り付けると共に、雌カプラー２を第２コンクリートＰＣ２の連結ロッドＰＣ２に取り付けておけば、第１コンクリート部品ＰＣ１の連結面ＰＣ１ａと第２コンクリート部品ＰＣ２の連結面ＰＣ２ａを組み合わせた後に、雌カプラー２を雄カプラー１に螺合するだけの簡単な作業で第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２との相互連結を良好に行うことできる。
【００３３】
また、第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２とを連結するときに相互連結面に荷重を加えておく必要がないので、コンクリート部品の形状や連結向き等の関係から荷重を加えることが困難或いは不可能な場合でも希望する水密性や気密性を有するコンクリート構造物を確実に得ることができる。
【００３４】
さらに、第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２を組み合わせた状態で雄ねじ部ＥＴ１の軸線ＣＬ１と雄ねじ部ＥＴ２の軸線ＣＬ２とにずれがある場合でも、雌カプラー２の挿通孔２ｂとこの挿通孔２ｂに挿入された雄ねじ部ＥＴ２との間に存する遊びを利用して雌カプラー２の位置を微調整して、雄カプラー１に対する雌カプラー２の螺合を適切に行うことができる。
【００３５】
さらに、螺合時における雌カプラー２の移動量を係止部２ｃが制限ナット３に接することで制限するようにし、しかも、この制限ナット３を止めねじ４によって連結ロッドＣＲ２の雄ねじ部ＥＴ２に固定してあるので、雌カプラー２を雄カプラー１に螺合するときに制限ナット３の螺合位置が供回り等の影響でずれることを確実に防止して、先に述べた雄カプラー１に対する雌カプラー２の螺合による第１コンクリート部品ＰＣ１と第２コンクリート部品ＰＣ２との相互連結を的確に行うことができる。
【００３６】
さらに、止めねじ４用のねじ込み工具を挿入するための貫通孔２ｄを雌カプラー２に設けることにより、止めねじ４を雌ねじ孔３ａにねじ込んで制限ナット３を雄ねじ部ＥＴ２に固定する作業を雌カプラー２の外側から行うことができる。つまり、雄ねじ部ＥＴ２に螺合した制限ナット３が雌カプラー２の内側に隠れてしまう場合でも止めねじ４のねじ込み作業を的確に行って制限ナット３を雄ねじ部ＥＴ２に固定するができるので、凹部ＦＰ２内で露出する雄ねじ部ＥＴ２の長さを短くして凹部ＦＰ２の大きさを小さくすることが可能で、これにより凹部ＦＰ２の大きさに依存する第２コンクリート部品ＰＣ２の強度低下を防止することができる。
【００３７】
尚、前述の実施形態では、制限ナット３に雌ねじ孔３ａを形成しこの雌ねじ孔３ａに止めねじ４をねじ込むことにより制限ナット３を雄ねじ部ＥＴ２に固定するものを示したが、図８に示すように、制限ナット３に外面からその雌ねじ孔に達する貫通孔３ｂを雌ねじ孔３ａと同様に少なくとも１個形成し、この貫通孔３ｂに圧入可能な圧入ピン５を止めねじ４の代わりに用いても制限ナット３を雄ねじ部ＥＴ２に固定することができる。この場合には、圧入ピン５を仮止めした制限ナット３を雄ねじ部ＥＴ２に螺合し、雌カプラー２の貫通孔２ｄと制限ナット３に仮止めされている圧入ピン５との位置合わせを行った後に、圧入工具を雌カプラー２の外側から貫通孔２ｄに挿入し、挿入された圧入工具をハンマー等により殴打して圧入ピン５を強く押し込んで制限ナット３を雄ねじ部ＥＴ２に固定すればよい。
【００３８】
また、前述の実施形態では、雌カプラー２を雄ねじ部ＥＴ２に外嵌した後に止めねじ４または圧入ピン５を仮止めした制限ナット３を雄ねじ部ＥＴ２に螺合するものを示したが、止めねじ４または圧入ピン５が仮止めされていない制限ナット３を雄ねじ部ＥＴ２に螺合した後に、止めねじ４または圧入ピン５を挿入可能な大きさを有する貫通孔２ｄを通じて雌カプラー２の外側から止めねじ４または圧入ピン５を制限ナット３の雌ねじ孔３ａまたは貫通孔３ｂに差し込むようにしてもよい。
【００３９】
さらに、前述の実施形態では、貫通孔２ｄを雌カプラー２に形成したものを示したが、雄ねじ部ＥＴ２に雌カプラー２を外嵌した状態で雌カプラー２から雄ねじ部ＥＴ２の端部が突出可能で、しかも、この突出部分に螺合された制限ナット３の雌ねじ孔３ａまたは貫通孔３ｂに外部から直接止めねじ４または圧入ピン５を取り付けることができる場合には、前記貫通孔２ｄは必ずしも必要なものではない。
【００４０】
【発明の効果】
以上詳述したように、本発明によれば、コンクリート部品の連結に所期の連結強度を確実に得ることができる連結器と、コンクリート部品が適正な強度状態で相互連結された連結構造体を提供できる。
【図面の簡単な説明】
【図１】本発明の一実施形態を示す連結構造体の分解図
【図２】図１に示した制限ナットとその変形例を示す図
【図３】雄カプラーの取付方法の説明図
【図４】雌カプラーの取付方法の説明図
【図５】雌カプラーの取付方法の説明図
【図６】コンクリート部品の連結方法の説明図
【図７】図５のＡ−Ａ線断面図
【図８】制限ナット及びナット固定具の他の例を示す図
【符号の説明】
ＰＣ１…第１コンクリート部品、ＰＣ１ａ…連結面、ＦＰ１…凹部、ＣＲ１…連結ロッド、ＰＣ２…第１コンクリート部品、ＰＣ２ａ…連結面、ＦＰ２…凹部、ＣＲ２…連結ロッド、１…雄カプラー、１ａ…雄ねじ部、１ｂ…雌ねじ穴、２雌カプラー、２ａ…雌ねじ穴、２ｂ…挿通孔、２ｃ…係止部、２ｄ…貫通孔、３…制限ナット、３ａ…雌ねじ孔、３ｂ…貫通孔、４…止めねじ、５…圧入ピン。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coupler for interconnecting concrete parts, and a coupling structure constituted by interconnecting concrete parts using the coupler.
[0002]
[Prior art]
Concrete structures such as waterways and retaining walls are assembled by carrying concrete parts manufactured at a factory to a site and connecting them appropriately at the site.
[0003]
Since the above connection is generally performed by welding or using a coupler, a connecting rod made of steel is provided on the concrete part so that its end is exposed near the connecting surface of the concrete part. I have. When interconnecting concrete parts by welding, the ends of the opposing connecting rods are joined by welding in a state where the connecting surfaces of the concrete parts are combined.
[0004]
An example of a connecting means using a connecting device is disclosed in Japanese Patent Application Laid-Open No. 63-118433. The coupler disclosed in the publication includes a male threaded coupler provided on a steel rod projecting from one concrete member, and a female threaded coupler provided on a steel rod projecting from the other concrete member. During the screwing of the couplers, the couplers are engaged with the heads of the steel rods to which the couplers are attached, thereby generating a pulling force on the steel rods to connect the concrete parts. Do.
[0005]
[Problems to be solved by the invention]
However, according to the conventional welding connection method and method, even if the axes of the connecting rods are slightly displaced from each other, the connection quality by welding varies, and the connection quality by welding depends on the environmental conditions and the ability of the welding operator. There is a problem that variation occurs. In addition, in order to obtain watertightness and airtightness at the connection part, it is necessary to perform welding with a load applied to the interconnecting surface of the concrete parts, but it is necessary to apply a load due to the shape of the concrete part and the connection direction etc. When it is difficult or impossible, a concrete structure having desired watertightness and airtightness cannot be obtained.
[0006]
Also, in the above-described coupler, since the head for restricting the movement of the coupler is integrally formed with the steel rod, the coupler is previously mounted on the steel rod when the steel rod is embedded in the concrete part. It is necessary to keep. That is, since a concrete part is equipped with not only a steel bar but also a coupler, the coupler becomes an obstacle when transporting and assembling the concrete part, and the coupler and the steel bar are deformed or damaged. There are cases.
[0007]
In order to solve this problem, if the above-mentioned head part is a nut, a male screw part to which this nut can be screwed is formed at the tip of the steel rod, and the head part is detachable from the steel rod, A coupler can be appropriately attached to a steel rod mounted on a concrete part. However, when such a configuration is employed, when the two couplers are screwed together, the nuts rotate with the couplers after the couplers engage with the nuts, causing a shift in a proper mounting position of the nuts on the steel rod. There is a risk that it will. Particularly, in a concrete structure such as a water channel or a retaining wall, it is necessary to connect adjacent concrete parts with high strength, so that when the above-described rotation occurs, an appropriate pulling force is generated on the steel rod. This makes it difficult to obtain an initial connection strength. It is also conceivable to fix the nut to the steel rod in advance by welding or bonding in the process before screwing both couplers in order to prevent the above-mentioned co-rotation, but the work time on site increases. In addition, equipment for fixing is required, and the cost increases.
[0008]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a connector capable of reliably obtaining an intended connection strength for connection of a concrete part, and a concrete part having an appropriate strength state. It is to provide an interconnected connection structure.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a connector according to the present invention is a connector used when a connecting rod interconnects concrete components buried such that a male screw portion at the tip thereof is exposed. A male coupler having a female screw hole that can be screwed to the male screw portion of the connecting rod from one end to the other end, and a female screw hole that can be screwed to the external male screw portion of the male coupler from one end to the other end. A female coupler having an insertion hole through which the male screw portion of the connecting rod can be inserted with play to reach the female screw hole from the other end, and having a locking portion at the boundary between the female screw hole and the insertion hole; It has at least one hole that reaches the female screw hole, and after externally fitting the female coupler to the male screw portion of the connecting rod through the insertion hole, the female coupler is screwed to the male screw portion of the connecting rod to stop the movement of the female coupler with the locking portion. By collaboration A limiting nut that can be restricted by a screw, and a nut fixing device that is screwed into the male screw portion of the connecting rod and then inserted into a hole of the limiting nut to fix the limiting nut to the male screw portion of the connecting rod. Features.
[0010]
According to this coupler, the female screw hole of the male coupler is screwed into the male screw part in the concave part of one concrete part, and the female coupler is externally fitted through the insertion hole in the male screw part in the concave part of the other concrete part. After fixing the limiting nut screwed to the male thread part at the appropriate position with the nut fixture, the female coupler is screwed to the male coupler in a state where the connecting surfaces of the concrete parts are combined, so that it is drawn to the opposing connecting rod. A force is applied to interconnect the concrete parts. The limiting nut is formed with at least one hole reaching the female screw hole from the outer surface. After screwing the limiting nut into the male screw portion of the connecting rod, the limiting nut is inserted into the hole of the limiting nut and the limiting nut is screwed into the male screw portion of the connecting rod. Since a nut fixing tool for fixing the female coupler is provided, even if the female coupler is further tightened after the locking portion of the female coupler abuts on the limiting nut in the process of screwing the male coupler and the female coupler, The limiting nut does not rotate with the female coupler, and the screwing position of the limiting nut does not shift.
[0011]
On the other hand, a connecting structure of the present invention is a concrete having a concave portion having an opening on a connecting surface and a surface adjacent to the connecting surface, and a connecting rod embedded inside the component such that a male screw portion at the tip is exposed in the concave portion. Parts, and a coupler for interconnecting the concrete parts by applying a pulling force to the opposing connecting rods in a state where the concrete parts are combined via the connecting surface, the coupler having an external thread portion on the outer surface. A male coupler having a female screw hole that can be screwed into the male screw portion of the connecting rod from one end to the other end, and a female screw hole that can be screwed into the external male screw portion of the male coupler from one end to the other end, A female coupler having an insertion hole through which the male screw part of the connecting rod can be inserted with play so as to reach the female screw hole from the other end, and having a locking portion at the boundary between the female screw hole and the insertion hole; The female coupler has at least one hole to reach, and after externally fitting the female coupler to the external thread of the connecting rod through the insertion hole, the female coupler is screwed to the external thread of the connecting rod to restrict the movement of the female coupler in cooperation with the locking part. A limiting nut that can be screwed into the male thread of the connecting rod, and then inserted into a hole of the limiting nut to fix the limiting nut to the male thread of the connecting rod. The coupler is attached by screwing a female screw hole into a male screw part in the concave part of one concrete part, and the female coupler is externally fitted to the male screw part in the concave part of the other concrete part through its insertion hole, and after external fitting, the male screw part The limiting nut is fixed to the male thread by a nut fixing tool. And interconnecting the concrete component by applying a force attracted to the opposite connecting rod by screwing a female coupler to male coupler in a state viewed combined, and its characterized by.
[0012]
According to this connection structure, the female screw hole of the male coupler is screwed into the male screw part in the concave part of one concrete part, and the female coupler is fitted to the male screw part in the concave part of the other concrete part through the insertion hole. After fixing the limiting nut screwed into the male screw part after fitting into the appropriate position with the nut fixing tool, screw the female coupler to the male coupler in a state where the connecting surfaces of the concrete parts are combined, so that the opposite connecting rod The concrete parts are interconnected in a proper strength state by applying a pulling force.
[0013]
The above and other objects, constitutional features, and operational effects of the present invention will become apparent from the following description and accompanying drawings.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 7 show one embodiment of the present invention. In FIG. 1, PC1 is a first concrete part, PC2 is a second concrete part, 1 is a male coupler, 2 is a female coupler, 3 is a limiting nut, and 4 is a set screw.
[0015]
The first and second concrete parts PC1 and PC2 are precast concrete parts for constructing concrete structures such as waterways and retaining walls. Further, a coupler for interconnecting the first concrete component PC1 and the second concrete component PC2 is constituted by the male coupler 1, the female coupler 2, the limiting nut 3 and the set screw 4.
[0016]
In the first concrete component PC1, one or more concave portions FP1 having an opening in a surface adjacent to the connecting surface PC1a and the connecting surface PC1a are formed along the connecting surface PC1a. When the first concrete component PC1 is large, the concave portion FP1 may be provided on each of two opposing surfaces adjacent to the connection surface PC1a. Further, inside the first concrete part PC1, a number of connecting rods CR1 made of steel material having a male screw portion ET1 at the tip thereof are buried corresponding to the number of the concave portions FP1, and the male screw portion ET1 of the connecting rod CR1 is in the concave portion FP1. It is exposed at. In the drawing, a connection rod CR1 is shown in which a convex portion or a concave portion is formed on the surface in order to increase the adhesion force with the first concrete component PC1 and increase the tensile strength of the connecting rod CR1. A member having no concave portion on the surface may be used as the connecting rod CR1. Further, the connecting rod CR1 may be connected to a reinforcing bar buried inside the first concrete component PC1 by welding, wire connection, or the like. Further, a longer main thread having an external thread portion at the tip may be used as the main rebar of the internal rebar, and the external thread portion of the main rebar may be exposed in the concave portion FP1 to replace the connecting rod CR1.
[0017]
In the second concrete component PC2, one or a plurality of concave portions FP2 having an opening in a surface adjacent to the connecting surface PC2a and the connecting surface PC2a are formed along the connecting surface PC2a. When the second concrete component PC2 is large, the concave portion FP2 may be provided on each of two opposing surfaces adjacent to the connection surface PC2a. The size and position of the concave portion FP2 substantially match the size and position of the concave portion FP1 of the first concrete component CP1. Further, inside the first concrete part PC2, a number of steel connection rods CR2 each having a male screw portion ET2 at the tip thereof are buried in a number corresponding to the number of the concave portions FP2, and the male screw portion ET2 of the connection rod CR2 is in the concave portion FP2. It is exposed at. In the drawing, a connection rod CR2 is shown in which a projection or a depression is formed on the surface in order to increase the adhesion strength with the second concrete component PC2 and increase the tensile strength of the connection rod CR2. Those having no concave portion on the surface may be used as the connecting rod CR2. Further, the connecting rod CR2 may be connected to a reinforcing bar buried inside the second concrete component PC2 by welding, wire connection, or the like. Further, a longer main thread having an external thread portion at the tip may be used as the main rebar of the internal rebar, and the external thread portion of the main rebar may be exposed in the concave portion FP2 to replace the connecting rod CR2.
[0018]
The male coupler 1 has a substantially cylindrical shape as a whole, and has a male screw portion 1a formed on the outer surface thereof from the upper end to the lower end. In the center of the lower end surface of the male coupler 1, a female screw hole 1b that can be screwed into the male screw portion ET1 of the connecting rod CR1 is formed from the lower end to the upper end. Further, a depression 1c is formed on the upper surface of the male coupler 1 to prevent the connecting rod CR2 of the second concrete component PC2 from hitting. Further, an annular flange 1d and a tool engaging portion 1e are formed below the male screw portion 1a on the outer surface of the male coupler 1. In the drawing, a tool constituted by a plurality of recesses arranged at equal angular intervals around the lower end surface of the male coupler 1 is shown as a tool engaging portion 1e. 1e.
[0019]
The female coupler 2 has a substantially cylindrical shape as a whole, and a female screw hole 2a into which the male screw portion 1a of the male coupler 1 can be screwed is formed from the lower end to the upper end in the center of the lower end surface. Although the drawing shows a female screw hole 2a having a non-threaded portion on its upper part, a female screw may be engraved on the whole. In the center of the upper end of the female coupler 2, an insertion hole 2b through which the male screw portion ET2 of the connecting rod CR2 can be inserted with play is formed so as to reach the female screw hole 2a from the upper end. The diameter of the insertion hole 2b is larger than the diameter of the male screw portion ET2 of the connecting rod CR2 and smaller than the diameter of the limiting nut 3. Further, at the boundary between the female screw hole 2a and the insertion hole 2b of the female coupler 2, a locking portion 2c constituted by an annular surface is formed. Further, in the female coupler 2, one or a plurality of through holes 2d reaching the female screw holes 2a from the outer surface are formed at intervals in the circumferential direction. The through hole 2d is for inserting a tool for screwing the set screw 4 into the female screw hole 3a of the limiting nut 3 from outside, and the shape may be an elliptical shape other than a circular shape or a polygonal shape. The minimum size that can be inserted by the screwing tool is sufficient. The number of the through-holes 2d may be one, but depending on the orientation of the female coupler 2 in a state where the female coupler 2 is completely screwed into the male coupler 1, there is a possibility that the hardening material injection operation described later cannot be performed. Therefore, it is preferable to provide two or more through holes 2d. Further, a tool engagement portion 2e is formed at the outer upper end of the female coupler 2. In the drawings, a plurality of concave portions arranged at equal angular intervals around the upper end surface of the female coupler 2 is shown as a tool engaging portion 2e, but a hexagonal portion, a quadrangular portion, or the like is shown as a tool engaging portion. 2e may be used.
[0020]
The limiting nut 3 is formed of a hexagonal nut, and has a diameter smaller than the diameter of the female screw hole 2a of the female coupler 2 and larger than the diameter of the insertion hole 2b. Further, the limiting nut 3 is formed with a female screw hole 3a reaching the female screw hole (no reference numeral) from the outer surface. The position where the female screw hole 3a is formed is arbitrary, and may be formed at a corner portion shown in FIG. 2A or a plane portion shown in FIG. 2B. Although the number of female screw holes 3a may be one, depending on the direction of the limiting nut 3 screwed into the male screw part ET2, there is a possibility that the screwing operation of the set screw 4 by a screwing tool described later may not be performed. Preferably, two female screw holes 3a are provided as shown in FIGS. 2A and 2B or three female screw holes 3a are provided as shown in FIGS. 2C and 2D. Of course, the limiting nut 3 may be provided with four or more female screw holes 3a.
[0021]
The set screw 4 has a cylindrical shape as a whole, and has an outer surface formed with a male screw portion (without reference numeral) that can be screwed into the female screw hole 3 a of the limiting nut 3. At one end of the set screw 4, a tool engaging portion (no symbol) formed of a minus groove, a plus groove, a hexagonal concave portion, or the like is formed.
[0022]
The male coupler 1 is attached to an exposed portion (male thread portion) of one of the connecting rods of the first and second concrete parts PC1 and PC2, and the female coupler 2 is connected to the other of the first and second concrete parts PC1 and PC2. It is attached to the exposed part (male thread part) of the rod.
[0023]
As shown in FIG. 3, when attaching the male coupler 1 to the connecting rod CR1 of the first concrete component PC1, the lock nut RN is screwed into the male thread portion ET1 of the connecting rod CR1 to be positioned at the deepest position. The female screw hole 1b of the male coupler 1 is screwed into the male screw part ET1.
[0024]
When the female coupler 2 is attached to the connecting rod PC2 of the second concrete component PC2 as shown in FIG. 4, the lock nut RN is screwed into the male thread portion ET2 of the connecting rod PC2 and positioned at the deepest position. Then, the female coupler 2 is externally fitted to the male screw portion ET2 through the insertion hole 2b. Next, in a state where the female coupler 2 is lifted, the limiting nut 3 temporarily fixing the set screw 4 is screwed into the male screw portion ET2. When the limiting nut 3 is screwed into the male screw portion ET2, the set screw 4 temporarily fixed to the limiting nut 3 is directed outward (to the left in FIG. 4).
[0025]
Then, as shown in FIG. 5, the female coupler 2 is lowered from the position shown in FIG. 4, and the female coupler 2 is turned if necessary, so that the through hole 2d of the female coupler 2 is temporarily fixed to the limiting nut 3. Align with screw 4. Next, a screwing tool adapted to the tool engagement portion of the set screw 4 is inserted into the through hole 2d from the outside of the female coupler 2, and the set screw 4 is strongly screwed by the inserted screw tool to set the limiting nut 3 to the male screw portion ET2. Fixed to.
[0026]
When interconnecting the first concrete part PC1 and the second concrete part PC2, as shown in FIG. 6, the connecting surface PC1a of the first concrete part PC1 and the connecting surface PC2a of the second concrete part PC2 are connected with a packing (not shown). Combine through. Since the positions of the concave portion FP1 of the first concrete component PC1 and the concave portion FP1 of the second concrete component PC2 substantially coincide with each other, the male screw portion ET1 exposed in the concave portion FP1 in a state where the coupling surfaces PC1a and PC2a are combined with each other. And the axis CL2 of the externally threaded portion ET2 exposed in the recess FP2 is substantially straight.
[0027]
Next, with the male coupler 1 held by a fingertip, the female coupler 2 is turned by a fingertip to screw the female screw hole 2 a into the male screw portion 1 a of the male coupler 1. When it becomes difficult to engage with the fingertip, a suitable tightening tool is engaged with the tool engaging portion 1e of the male coupler 1 and the tool is engaged with the tool engaging portion 2e of the female coupler 1. Engage a suitable tightening tool and continue threading female coupler 2 onto male coupler 1.
[0028]
As a result, the connecting rod CR1 of the first concrete component PC1 is provided with a pulling force indicated by a thick arrow through the male coupler 1, and the second concrete component PC2 is connected through the restriction nut 3 engaged with the female coupler 2 and the locking portion 2c. Of the first concrete component PC1 and the connecting surface PC2a of the second concrete component PC2 are pressed into contact with each other through the packing, and the first connecting rod CR2 is pressed against the first connecting rod CR2 by the packing. The concrete part PC1 and the second concrete part PC2 are connected.
[0029]
An annular gap (play) exists between the insertion hole 2b of the female coupler 2 and the male screw portion ET2 inserted into the insertion hole 2b, and the play allows the position of the female coupler 2 to be aligned with the axis CL2 of the male screw portion ET2. Since the fine adjustment can be performed in the orthogonal direction, even if the axis CL1 of the male screw portion ET1 and the axis CL2 of the male screw portion ET2 are displaced in a state where the first concrete component PC1 and the second concrete component PC2 are combined, the above play is prevented. The female coupler 2 can be appropriately screwed to the male coupler 1 by utilizing the same.
[0030]
In addition, the amount of movement of the female coupler 2 at the time of screwing is limited by the engaging portion 2c being in contact with the limiting nut 3, and the limiting nut 3 is fixed to the male screw portion ET2 of the connecting rod CR2 by the set screw 4. Therefore, when the female coupler 2 is screwed into the male coupler 1, the screwing position of the limiting nut 3 is reliably prevented from being shifted due to the influence of co-rotation and the like. The first concrete part PC1 and the second concrete part PC2 can be accurately interconnected by screwing the coupler 2 together.
[0031]
After the screwing work of the female coupler 2 with the male coupler 1 is completed, the lock nut RN on the male coupler 1 side is tightened up using a tightening tool such as a wrench to press the lock nut RN against the male coupler 1 and press the female coupler 2 side. Of the lock nut RN is tightened up with a tightening tool such as a wrench and pressed against the female coupler 2. Thereafter, a hardening material such as an epoxy resin is injected into the space in the coupler from the through hole 2d of the female coupler 2, and the hardening material such as mortar is filled in the concave portions FP1 and FP2 which are continuous with each other. . As described above, the first concrete part PC1 and the second concrete part PC2 are interconnected, and by repeating the same operation, a concrete structure such as a waterway or a retaining wall is constructed.
[0032]
As described above, according to the above-described embodiment, when the male coupler 1 is attached to the connecting rod PC1 of the first concrete component PC1 and the female coupler 2 is attached to the connecting rod PC2 of the second concrete PC2, the first concrete After assembling the connecting surface PC1a of the component PC1 and the connecting surface PC2a of the second concrete component PC2, the first concrete component PC1 and the second concrete component PC2 are connected to each other by a simple operation of merely screwing the female coupler 2 to the male coupler 1. Can be satisfactorily interconnected.
[0033]
Further, when connecting the first concrete component PC1 and the second concrete component PC2, it is not necessary to apply a load to the interconnecting surface, so it is difficult to apply a load due to the shape of the concrete component and the connection direction. Alternatively, even when impossible, a concrete structure having desired watertightness and airtightness can be reliably obtained.
[0034]
Furthermore, even when the axis CL1 of the male screw part ET1 and the axis CL2 of the male screw part ET2 are misaligned in a state where the first concrete part PC1 and the second concrete part PC2 are combined, the insertion hole 2b of the female coupler 2 and this insertion hole. The position of the female coupler 2 can be finely adjusted using the play existing between the male coupler ET2 inserted into the male coupler 2b and the female coupler 2 can be appropriately screwed to the male coupler 1.
[0035]
Further, the amount of movement of the female coupler 2 at the time of screwing is limited by the engaging portion 2c being in contact with the limiting nut 3, and the limiting nut 3 is fixed to the male thread portion ET2 of the connecting rod CR2 by the set screw 4. Therefore, when the female coupler 2 is screwed into the male coupler 1, the screwing position of the limiting nut 3 is reliably prevented from being shifted due to the influence of co-rotation and the like. The first concrete part PC1 and the second concrete part PC2 can be accurately connected to each other by screwing the coupler 2 together.
[0036]
Further, by providing a through hole 2d for inserting a screwing tool for the set screw 4 in the female coupler 2, the operation of screwing the set screw 4 into the female screw hole 3a and fixing the limiting nut 3 to the male screw portion ET2 is performed. 2 can be performed from outside. That is, even when the limiting nut 3 screwed into the male screw portion ET2 is hidden inside the female coupler 2, the screwing operation of the set screw 4 can be performed accurately to fix the limiting nut 3 to the male screw portion ET2. The size of the concave portion FP2 can be reduced by shortening the length of the external thread portion ET2 exposed in the FP2, thereby preventing the strength of the second concrete component PC2 depending on the size of the concave portion FP2 from decreasing. Can be.
[0037]
In the above-described embodiment, the female nut hole 3a is formed in the restricting nut 3, and the restricting nut 3 is fixed to the male screw part ET2 by screwing the set screw 4 into the female screw hole 3a, as shown in FIG. As described above, at least one through hole 3b reaching the female screw hole from the outer surface of the limiting nut 3 is formed similarly to the female screw hole 3a, and the press-fit pin 5 press-fittable into the through hole 3b is used instead of the set screw 4. Also, the limiting nut 3 can be fixed to the male screw portion ET2. In this case, the limiting nut 3 temporarily fixing the press-fit pin 5 is screwed into the male screw portion ET2, and the positioning of the through-hole 2d of the female coupler 2 and the press-fit pin 5 temporarily fixed to the limiting nut 3 is performed. After that, the press-fitting tool is inserted into the through-hole 2d from the outside of the female coupler 2, and the inserted press-fitting tool is beaten with a hammer or the like, and the press-fitting pin 5 is strongly pushed to fix the limiting nut 3 to the male screw portion ET2. .
[0038]
In the above-described embodiment, the female nut 2 is externally fitted to the male screw portion ET2, and then the limiting nut 3 to which the set screw 4 or the press-fit pin 5 is temporarily fixed is screwed to the male screw portion ET2. After the limiting nut 3 to which the press-fit pin 4 or the press-fit pin 5 is not temporarily fixed is screwed into the male screw portion ET2, the screw is stopped from the outside of the female coupler 2 through a through hole 2d having a size into which the set screw 4 or the press-fit pin 5 can be inserted. The screw 4 or the press-fit pin 5 may be inserted into the female screw hole 3a or the through hole 3b of the limiting nut 3.
[0039]
Furthermore, in the above-described embodiment, the through hole 2d is formed in the female coupler 2, but the end of the male screw part ET2 can protrude from the female coupler 2 in a state where the female coupler 2 is externally fitted to the male screw part ET2. In addition, when the set screw 4 or the press-fit pin 5 can be directly attached from the outside to the female screw hole 3a or the through hole 3b of the limiting nut 3 screwed to the protruding portion, the through hole 2d is necessarily required. Not something.
[0040]
【The invention's effect】
As described above in detail, according to the present invention, a connector capable of reliably obtaining an expected connection strength for connection of concrete parts and a connection structure in which concrete parts are interconnected in an appropriate strength state. Can be provided.
[Brief description of the drawings]
FIG. 1 is an exploded view of a connection structure showing one embodiment of the present invention.
FIG. 2 is a diagram showing a limiting nut shown in FIG. 1 and a modified example thereof.
FIG. 3 is an explanatory view of a mounting method of a male coupler.
FIG. 4 is an explanatory view of a mounting method of the female coupler.
FIG. 5 is an explanatory view of a mounting method of the female coupler.
FIG. 6 is an explanatory view of a method of connecting concrete parts.
FIG. 7 is a sectional view taken along line AA of FIG. 5;
FIG. 8 is a diagram showing another example of a limiting nut and a nut fixing device.
[Explanation of symbols]
PC1: first concrete component, PC1a: connecting surface, FP1: concave portion, CR1: connecting rod, PC2: first concrete component, PC2a: connecting surface, FP2: concave portion, CR2: connecting rod, 1: male coupler, 1a: male screw , 1b ... female screw hole, 2 female coupler, 2a ... female screw hole, 2b ... insertion hole, 2c ... locking portion, 2d ... through hole, 3 ... limit nut, 3a ... female screw hole, 3b ... through hole, 4 ... stop Screw, 5 ... Press-fit pin.

Claims

A coupling used when the coupling rod interconnects concrete components buried so that the external thread portion at the tip is exposed,
A male coupler having a male screw portion on the outer surface and having a female screw hole screwable to the male screw portion of the connecting rod from one end to the other end,
Having a female screw hole that can be screwed to the external male screw part of the external surface of the male coupler from one end to the other end, the male screw part of the connecting rod has an insertion hole that can be inserted with play to reach the female screw hole from the other end, A female coupler having a locking portion at the boundary between the female screw hole and the insertion hole,
At least one hole reaching the female screw hole from the outer surface, the female coupler is externally fitted to the male screw portion of the connecting rod through the insertion hole, and then screwed to the male screw portion of the connecting rod to stop the movement of the female coupler. A limiting nut that can be limited by cooperation with
A nut fixing tool that is inserted into the hole of the limiting nut after the limiting nut is screwed into the male screw portion of the connecting rod to fix the limiting nut to the male screw portion of the connecting rod.
A coupler characterized in that:

The hole of the limiting nut is a female screw hole, and the nut fixture is a set screw that can be screwed into this female screw hole.
The coupler according to claim 1, wherein:

The hole of the limiting nut is a through-hole, and the nut fixture is a press-fit pin that can be press-fitted into this through-hole.
The coupler according to claim 1, wherein:

The female coupler has at least one through hole reaching the female screw hole from the outer surface,
The coupler according to any one of claims 1 to 3, wherein:

A concrete part having a connection surface and a recess having an opening in a surface adjacent to the connection surface, and a connection rod embedded inside the component such that a male screw portion at the tip is exposed in the recess;
A coupler for interconnecting the concrete parts by applying a pulling force to the opposing connecting rods in a state where the concrete parts are combined via the connecting surface,
The coupler has a male screw portion on its outer surface, a male coupler having a female screw hole that can be screwed into the male screw portion of the connecting rod from one end to the other end, and a female screw that can be screwed into the external male screw portion of the male coupler. It has a hole from one end to the other end, and has an insertion hole through which the male screw part of the connecting rod can be inserted with play so as to reach the female screw hole from the other end, and is locked at the boundary between the female screw hole and the insertion hole. And a female coupler having at least one hole extending from the outer surface to the female screw hole. The female coupler is externally fitted to the male screw portion of the connecting rod through the insertion hole, and then screwed to the male screw portion of the connecting rod to form a female. A limiting nut that can limit the movement of the coupler in cooperation with the locking part, and after screwing the limiting nut into the male thread of the connecting rod, insert it into the hole of the limiting nut and fix the limiting nut to the male thread of the connecting rod Suna It consists of a door fixture,
The male coupler of this coupler is attached by screwing a female screw hole into a male screw part in the concave part of one concrete part, and the female coupler is fitted over the male screw part in the concave part of the other concrete part through the insertion hole. After external fitting, it is attached by screwing a limiting nut to the male screw part.The limiting nut is fixed to the male screw part by a nut fixing tool, and the female coupler is screwed to the male coupler in a state where the connecting surfaces of the concrete parts are combined. The concrete parts are interconnected by applying a pulling force to the opposing connecting rods by joining them together.
A connection structure, characterized in that:

The hole of the limiting nut is a female screw hole, and the nut fixture is a set screw that can be screwed into this female screw hole.
The connection structure according to claim 5, wherein

The hole of the limiting nut is a through-hole, and the nut fixture is a press-fit pin that can be press-fitted into this through-hole.
The connection structure according to claim 5, wherein

The female coupler has at least one through hole reaching the female screw hole from the outer surface,
The connection structure according to any one of claims 5 to 7, wherein: