JP3798359B2

JP3798359B2 - Joint structure

Info

Publication number: JP3798359B2
Application number: JP2002299097A
Authority: JP
Inventors: 清宮; 裕三山本; 文行横溝; 公宏吉田; 宗孝大関; 博英橋本; 崇國藤; 歓共植浦; 正徳後藤; 壽南波
Original assignee: Obayashi Corp
Current assignee: Obayashi Corp
Priority date: 2002-10-11
Filing date: 2002-10-11
Publication date: 2006-07-19
Anticipated expiration: 2022-10-11
Also published as: JP2004132093A

Description

【０００１】
【発明の属する技術分野】
本発明は、雌雄継手による継手構造、特に自動結合が容易となり、とりわけトンネルのセグメントブロックの接合に好適な継手構造に関するものである。
【０００２】
【従来の技術】
従来、トンネル施工において、鋼、鉄筋コンクリートなどで製作されたセグメントを円筒状に接合して覆工を形成することが行われている。図７はその組立の様子の概要を示すものである。
【０００３】
符号３１はセグメントであり、円周方向に隣接させられるとともに、既設のセグメント３１の接合面３１ａに矢印方向から接合されて接合方向に延ばされ、セグメントリング３０を形成する。
【０００４】
このような接合面３１ａにおける接合方式には、例えば、特許文献１に記載されているように、接合面同士をボルト・ナットで締結する方式、接合面に穴を設けピン部材を嵌合させて接着により固定する方式があった。また、特許文献２に記載されているように、三角錐状のガイドピンを同じく三角錐状の穴に密着させて嵌合させる方式があった。
【０００５】
【特許文献１】
特開平７−２３８７８９号公報（第２−４頁、図１−４、図９）
【特許文献２】
特開平１０−１６９３８０号公報（第２−４頁、図１−２）
【０００６】
【発明が解決しようとする課題】
しかしながら、これらの従来の継手構造には、以下の問題があった。
特許文献１に記載のボルト・ナット締結では、セグメントを対向させて支持した状態でトンネル内側から締結を行うため、非常に手間のかかる作業になるという問題があった。
また特許文献１、２に記載のピン部材を用いる方式は、いずれの方式も、ピン部材を密着するように嵌合させるため、ピン部材と嵌合穴の間に高精度の位置精度が必要になるので、セグメントの製作コストが高くつき、接合作業時の位置合わせにも手間がかかって作業性が悪いという問題があった。また、ピン部材は一方のセグメントに嵌合されると固定されるので、他方のセグメントを押し込む際、わずかでも位置がずれるだけで、互いを損傷してしまうという問題があった。また、従来の継手構造は、樹脂化に適していなかったので、樹脂化して低コストで製作することができないという問題があった。
【０００７】
本発明は、このような問題に鑑みてなされたものであって、接合の作業性が向上され、低コストでの製作が可能となる継手構造を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記の課題を解決するために、請求項１に記載の発明では、互いに接合される一対の被接合部材に、それぞれの接合面を窪ませて形成した受け穴と、該受け穴の奥側に固設された雌型継手が備えられ、該雌型継手に係合可能とされた継手部材を介して、前記被接合部材をそれぞれ接合面に対向させて接合する継手構造であって、前記継手部材が、前記雌型継手に係合可能とされた係合突条を長手方向の両端に備える軸状部と、該軸状部の中央に該軸状部と直交して設けられ、継手係合時に、厚さ方向が、対向された前記受け穴の両方の内部にわたって収納される板状部と、該板状部と前記軸状部の間に設けられ、継手係合時に、先端の一部が前記受け穴に食い込む位置に置かれたフィンを有する挿着部とを備え、前記雌型継手が、前記継手部材の係合突条が通過可能とされたリング状固定部と、該リング状固定部からその奥側にすぼまるように傾斜して延ばされて前記リング状固定部のリング外周方向へ可撓とされた弾性を有するとともに、前記継手部材の係合突条に先端が係止可能とされた、複数の爪状部とを備えてなる。
そのため、継手部材を雌型継手に押し込むことによって、係合突条と爪状部を係合させることができ、その状態で、継手部材は受け穴に挿着部をガタなく挿着され、被接合部材のずれに伴う接合面方向の荷重は板状部で担荷され、被接合部材の引張りに伴う引張方向の荷重は軸状部で担荷される。
【０００９】
請求項２に記載の発明では、請求項１に記載の継手構造において、前記雌型継手が、前記被接合部材に係止されるハウジングと、前記ハウジングに着脱可能に設けられた係止爪部材とからなり、該係止爪部材に、前記リング状固定部と前記爪状部とからなる構成を用いる。
そのため、形状の複雑な係止爪部材を別体で設けることができる。
【００１０】
請求項３に記載の発明では、請求項２に記載の継手構造において、前記被接合部材が鉄筋コンクリートで構成され、前記ハウジングが該被接合部材の鉄筋に係止されてなる構成を用いる。
そのため、鉄筋が係止のための構造を兼ねることができる。
【００１１】
請求項４に記載の発明では、請求項１または２に記載の継手構造において、前記被接合部材が鉄筋コンクリートで構成され、前記ハウジングが引き抜かれる方向に該被接合部材の鉄筋が配される構成を用いる。
そのため、ハウジングが引抜力を受けても鉄筋によって支持されるため、ハウジングが被接合部材内に高強度に保持される。
【００１２】
【発明の実施の形態】
以下では、本発明の実施の形態を、添付図面を参照して説明する。なおすべての図面を通して、同一または相当する部材は、同一の符号を付している。
図１は、本発明に係る継手構造の実施の形態を示す断面図であり、セグメント１（被接合部材）の厚さ方向の断面を示している。
セグメント１は、鉄筋コンクリート製であり、鉄筋６が内部に枠状に配筋されている。接合面１ａには、円錐状内面を備えるすり鉢状に窪まされて、奥側に円筒穴が設けられた受け穴１ｂがセグメント１の幅方向に複数設けられ、その奥側に、雌型継手３が固設されている。図示では省略されている接合面１ａの反対側の接合面１ａにも同様の受け穴１ｂおよび雌型継手３が設けられ、さらに、このセグメント１に接合される他のセグメント１も同様の構造を備えている。セグメント１同士は、軸状に延ばされて両端でそれぞれ雌型継手３に係合可能とされた継手部材２を雌型継手３に係合させることにより接合される。図１は、一方のセグメント１の雌型継手３に継手部材２が押し込まれて係合された状態を示している。
【００１３】
なお、接合面１ａには、通常は複数の受け穴１ｂが設けられ、そこに係合する継手部材２も複数あるが、必要ならそれぞれ単数であってもよい。
【００１４】
まず継手部材２の詳細構成を説明する。
図２（ａ）は、継手部材２の詳細構成を説明するための説明図である。図２（ｂ）はそのＡ−Ａ断面図、図２（ｃ）はそのＢ−Ｂ断面図である。継手部材２は、円柱状に延ばされた軸状部２ｃと、その両端にそれぞれ設けられた係合突条２ａ、２ａと、中央に軸状部２ｃと同軸で軸状部２ｃに直交するように設けられた円板フランジからなる板状部２ｂとを備える。板状部２ｂは、受け穴１ｂの開口の大きさよりわずかに小さい大きさとされる。またその厚さは継手係合時に、厚さ方向に、対向された受け穴１ｂ、１ｂの両方の内部にわたって収納される厚さとされ、例えば、接合面１ａ、１ａが接合面方向に滑ってずれた場合、板状部２ｂの外周部に受け穴１ｂの内面が当接するような構成とされる。
【００１５】
また、板状部２ｂと軸状部２ｃとの間には、軸状部２ｃの軸方向にそれぞれ平行で、互いに直交する２方向に整列された三角リブ状のフィン２ｅ…が適宜間隔を空けて設けられている。
【００１６】
係合突条２ａ、２ａは、軸状部２ｃと同軸の突条で、端部側はテーパ２ｇを備える円錐台形状で、中央側は、軸状部２ｃに垂直な係止面２ｆが形成されている。係合突条２ａ、２ａの外径は受け穴１ｂの内径より小さく、受け穴１ｂの底部に設けられた円筒穴よりも小さく構成され、それぞれが貫通可能な大きさとされている。
【００１７】
フィン２ｅ…は、その斜辺部を連ねる包落面が円錐台を形成し、受け穴１ｂにがたつきなく挿着可能とされて、継手部材２のその接合面方向の移動や、軸状部２ｃの傾きを規制する挿着部２ｄを構成している。具体的には、継手部材２が雌型継手３とちょうど係合した時、挿着部２ｄが受け穴１ｂの内面から、セグメント１の内部側にわずかに食い込む大きさおよび位置関係とされている。そのために、フィン２ｅ…の斜辺部の先端は、受け穴１ｂの内面に押圧されると、変形あるいは摩滅して、受け穴１ｂとがたなく密接するように構成されている。
【００１８】
フィン２ｅ…の斜辺部先端の変形あるいは摩滅をできるだけ少ない押圧力で実現するためには、例えば、比較的ヤング率の小さい材質を用いてたわみやすくしたり、比較的もろい材質を用いて摩滅しやすくしたり、板厚を先端に向かって薄くしたり、先端を櫛歯状としたりすることが有効である。
【００１９】
なお、フィン２ｅ…を上記のように２方向への型割が可能な構成としているため、継手部材２を樹脂一体成形することが容易であり、特に型製作が簡素化されるので、低コストで製作できる利点がある。
【００２０】
次に雌型継手３の詳細構成を説明する。雌型継手３は、セグメント１内部に係止され、係合時に継手部材２を内部に収納するためのスペースを確保するハウジング５と、ハウジング５にねじで着脱可能に取り付けられた係止爪部材４からなる。図３（ａ）はハウジング５の軸方向断面図であり、図３（ｂ）は図３（ａ）のＣ視方向側面図である。また、図４（ａ）は、係止爪部材４を係合時にセグメント１の内部側から見た左側面図であり、図４（ｂ）はそのＤ−Ｄ断面図である。図４（ｃ）は、同じくセグメント１の外部側から見た右側面図である。
【００２１】
ハウジング５は、図３に示したように、一方に開口を備える円筒断面のキャップ状の部材で、内部には、係止爪部材４と係合時の継手部材２を納める空間を備える。開口には、内周側に係止爪部材４とねじ嵌合可能な雌ねじ５ａが形成され、外周側に、例えば楕円板状でその長軸方向が外側に張り出したつば部５ｂを備える。
【００２２】
係止爪部材４は、図４に示したように、リング状固定部４ｂのリング内周に、ヒンジ部４ｇ…を介して４つの爪状部４ａ…が設けられたものである。
【００２３】
リング状固定部４ｂは、そのリング内径が継手部材２の係合突条２ａが通過可能な大きさとされ、そのリング外周にハウジング５の雌ねじ５ａとねじ嵌合可能な雄ねじ４ｆが設けられている。また継手部材２が挿入される側には、リング開口の全周に面取りが設けられている。
【００２４】
ヒンジ部４ｇ…は、図４（ｂ）Ｅ部の拡大図として図５に示したように、リング状固定部４ｂのリング内周で、リング状固定部４ｂと爪状部４ａ…を結合するよう設けられた薄肉の可撓体であり、爪状部４ａ…をヒンジ部４ｇ…を中心として復元自在に回動可能となる弾性を備える構成とされる。
【００２５】
爪状部４ａ…は、ヒンジ部４ｇ…からリング状固定部４ｂの中心軸方向へ向けて斜めに延ばされた円錐管の一部が輪切りされた上で軸方向に４分割されている。外力が加わらない状態において、爪状部４ａ…のヒンジ部４ｇ…側の端部は、リング状固定部４ｂの側部とほぼ平行でその間に、隙間ｗが形成されている。また爪状部４ａ…の他方の端部は、リング中心軸にほぼ直交する平面上に整列する係止面４ｄ…がそれぞれ設けられている。またリング中心軸方向には、継手部材２の軸状部２ｃとほぼ同径の円に整列した円弧面４ｃ…がそれぞれ形成されている。
【００２６】
爪状部４ａの軸状部２ｃに対する傾斜は、爪状部４ａの厚さにもよるが、緩やかであることが望ましく、最大でも４５°、より好ましくは３０°以下とするのがよい。なお、上記に説明したリング状固定部４ｂの内径と係合突条２ａの外径の関係から、もっとも緩くても０°となることはできない。また爪状部４ａの厚さは、爪状部４ａの延びる方向の座屈強度、圧縮強度を考慮して、適宜な厚さとされる。
【００２７】
係止爪部材４は、ハウジング５にねじ嵌合されて雌型継手３を構成し、受け穴１ｂの底部に埋め込まれる。図１に示したように、受け穴１ｂは、接合面１ａに平行に配筋された鉄筋６の間に設けられ、雌型継手３は、ハウジング５のつば部５ｂが鉄筋６の裏側に当接するように配設される。
【００２８】
なお、つば部５ｂは、楕円板状のため、型枠中にハウジング５を配設する際に、つば部５ｂの延びる方向を鉄筋６と平行にして、鉄筋６の間隔を通過させ、そののちつば部５ｂを９０°回転させて、つば部５ｂが鉄筋６に当接させるという手順で配置することができて、型枠へのセットが容易となるという利点がある。このためには、つば部５ｂが、一方向に延ばされて設けられていれば十分であり、例えば長方形板などでもよく、楕円板に限られないことは言うまでもない。
【００２９】
なお、以上に構成を説明した継手部材２、係止爪部材４、ハウジング５の材質は、エンジニアリングプラスチック、スーパーエンジニアリングプラスチックなどの単体、アロイ、または強化繊維入りなどの合成樹脂を採用することができる。必要強度に応じてこのような材質のうちどのような材質を用いてもよく、また、それぞれの部材に用いる材質は互いに異なっていてもよい。さらに、金属部材をインサート、アウトサートしてもよいことは言うまでもない。
【００３０】
特により低廉に製作するためには、一体成形が可能な材料を採用することが好ましい。またその場合、成形を容易にし、あるいは材料の使用量を減らすため、図２（ｂ）では中実軸として描かれている軸状部２ｃの中心が肉抜きされた円筒状としてもよい。
【００３１】
上記の構成では、雌型継手３を、ハウジング５とそれに着脱可能に設けた係止爪部材４に分割して構成しているので、例えば、ハウジング５には、コンクリートに埋め込むのに好適な耐薬品性、耐水性の材質を用い、係止爪部材４には、ヒンジ部４ｇの形成が容易な弾性を備える材質、あるいは爪状部４ａなどの複雑な一体成形が容易となる高流動性の材質を用いるというように使い分けが可能となるという利点を備える。
【００３２】
また、係止爪部材４とハウジング５の嵌合をねじ嵌合としたので、組立が容易となるとともに、ねじピッチ、ねじ部長さを適宜調整することにより、嵌合強度を適宜に設定することが可能となっている。
【００３３】
次に、本発明に係る継手構造の係合動作を説明する。
まず、受け穴１ｂの開口から継手部材２の先端を挿入する。係合突条２ａの外径は受け穴１ｂの内径より小さいので、その径差の範囲で接合面方向に芯ずれしても挿入が可能である。また、テーパ２ｇを先端に備えているので、受け穴１ｂの開口および内面との当たりが滑らかになっている。
【００３４】
さらに挿入を続けると、テーパ２ｇが爪状部４ａ…の内面に当たり、爪状部４ａ…は継手部材２からリング外周方向に外力を受け、外側に押し開かれ、爪状部４ａ…がテーパ２ｇを乗り越え、係合突条２ａの範囲を通過する。
【００３５】
なお、このとき、爪状部４ａ…は、リング状固定部４ｂの端面と隙間ｗをへだてているに過ぎないから、爪状部４ａ…が外側に押し開かれて、隙間ｗを越えて回動しようとすると、爪状部４ａ…の端部とリング状固定部４ｂの端面が当接し、ヒンジ部４ｇはロックされる。したがって、挿入時に過度の芯ずれが起こった場合は、ロックされたヒンジ部４ｇから、抵抗を受けて芯ずれが規制される。
【００３６】
係合突条２ａを通過すると、爪状部４ａ…の受けていたリング外周方向への外力がなくなるので、ヒンジ部４ｇ…の弾性反力により、爪状部４ａ…変形前の状態に復帰する。したがって、爪状部４ａの係止面４ｄと継手部材２の係止面２ｆが対向して当接し、継手部材２の軸方向に係合される。
【００３７】
一方、上記継手部材２の挿入の過程で、継手部材２の挿着部２ｄが受け穴１ｂの内面と接近すると、芯ずれがあれば、互いに当接してその接合面方向への移動が規制されるから、挿入が進むとともに芯ずれが矯正される。
【００３８】
さらに上記係合が完成する直前には、挿着部２ｄと受け穴１ｂの内面が全体的に当接しあう状態になる。したがって、継手部材２の挿入負荷が大きくなるが、さらに挿入を続けると、フィン２ｅ…の斜辺部先端が受け穴１ｂの内面と強く当接し、フィン２ｅ…がたわむか、その先端がこすれて摩滅するかして、受け穴１ｂに密接して案内された状態で挿着される。そのため、継手部材２と係止爪部材４が係合される状態では、同時に挿着部２ｄと受け穴１ｂは接合面方向への移動が規制された状態のまま係合される。
【００３９】
このようにして、継手部材２を受け穴１ｂに沿って押し込んでいくと、セグメント１に対して、接合面の法線方向と接合面方向が同時に、しかも自動的に係合され、その姿勢が固定される。このように継手部材２が係合されたセグメント１をその接合面１ａに係合された継手部材２をそれぞれ、他のセグメント１の受け穴１ｂに対して対向させて押し込むことにより、上記と同様の作用によってセグメント１同士の接合が完成する。
【００４０】
このように本発明によれば、継手部材２の挿着がきわめて容易に行うことができる利点がある。機械を利用する場合も、一方向に押し込む装置だけでよいので、きわめて簡便な装置を用いて接合作業ができるという利点がある。
【００４１】
次に、接合完了後の作用について説明する。
互いに接合された一対のセグメント１は、例えば地震などの外力は、セグメント１、１を接合面方向にずらすせん断力として作用する場合と、セグメント１、１の接合面を引き離す方向に引っ張る引張力として作用する場合に分けて考察することができる。一般の場合は、それらが複合して作用するものとして理解される。
【００４２】
まず、せん断力を受ける場合、本発明による継手部材２の係合時には、挿着部２ｄが受け穴１ｂに密接して挿着されているため、剛体的にそれぞれのセグメント１と一体化されているから、せん断力は、接合面１ａ、１ａの位置に集中的に作用する。本発明ではその位置に、受け穴１ｂの開口の大きさよりわずかに小さい大きさの板状部２ｂを配するので、比較的大きなせん断力を担荷することができる。それ以外の部位は軸状で比較的小断面積とされるので、全体的に少ない材料で有効にせん断外力に抗することができる利点がある。
【００４３】
次に、引張力を受ける場合、まず継手部材２および爪状部４ａ…がそれぞれ所定の引張応力、圧縮応力に耐えるように設計されていることは言うまでもない。さらに、本発明では、爪状部４ａ…が係合突条２ａから荷重を受ける際、爪状部４ａ…が継手部材２の軸方向に対して浅い角度に傾斜させられて備えているので、座屈しにくい構成になっている。また、係止面２ｆと係止面４ｄは軸状部２ｃに垂直な平面として当接しており、この当接面内では圧縮力分力がないから、爪状部４ａ…がリング外周方向にすべって外れることもない。したがって、爪状部４ａ…と継手部材２の係合はセグメント１が引張力を受けても安定しているという利点がある。
【００４４】
また、ヒンジ部４ｇを薄肉の可撓体としたため、セグメント１が引っ張られて爪状部４ａ…が圧縮されると、ヒンジ部４ｇは、リング内周方向に張り出してたわみ、爪状部４ａ…の端部とリング状固定部４ｂの端面が直に当接して荷重を伝達し、ヒンジ部４ｇは圧縮荷重を逃れることができるから、強大な圧縮荷重が生じてもヒンジ部４ｇが圧縮破損されることがないという利点がある。
【００４５】
また引張力を受ける場合、ハウジング５も係止爪部材４を介して、セグメント１から引き抜かれる方向に引張り力を受ける。本発明では、ハウジング５のつば部５ｂを鉄筋６に当接させて埋め込むので、鉄筋６が抜け止めの機能を果たしている。そのため、ハウジング５とコンクリートの密着性がそれほど強固でなくても引張力に抵抗できる利点がある。
【００４６】
なお、ハウジング５に抜け止めするために、上記の他にも、例えば、ハウジング５の外部に引抜きの抵抗となるリブ状、フィン状や凹凸などの形状を付加してもよいことは言うまでもない。
【００４７】
また、上記では、つば部５ｂを単に鉄筋６に当接させる構成として説明したが、ハウジング５に鉄筋６を係止するための溝形状などからなる係止部を設けておくとさらに効果的である。この場合、ハウジング５を鉄筋６に係止できるから、ハウジング５を埋め込む際、ハウジング５を支える必要がないので、セグメント１の型枠をより簡素に構成することができるという利点がある。
【００４８】
なお、上記の説明では、爪状部４ａ…が円錐管を４分割した例で説明したが、４分割と限らないことは言うまでもない。分割数が多いほど、ヒンジ部４ｇ…がより直線的となり、ヒンジ部４ｇを厚く構成しても好適な弾性が得られやすいという利点がある。
【００４９】
以上に説明したように、本発明によれば、被接合部材同士の接合を容易に行うことができて、接合作業の効率を向上することができ、特に自動接合に好適となる。また継手部材に作用するせん断力と引張力を板状部と軸状部でそれぞれ担荷して材料の配置を効率化し、材料の使用量を減らすとともに、被接合部材の受け穴の奥に挿入される部分を比較的小断面積の軸状部とすることで、雌型継手をコンパクトに構成でき、適用可能な被接合部材の厚さの範囲を広げられる。
【００５０】
なお、上記ヒンジ部４ｇは、図５に示すような薄肉の可撓体とした例で説明したが、継手部材２が挿入される際、係合突条２ａによってリング外周方向に押し開かれて、係合突条２ａが通過後、弾性復元力によって、元の位置に戻るならば、その構成に限るものではない。例えば、図６に示したように爪状部４ａの断面がリング状固定部４ｂとの接続部分で狭められることによってヒンジ部４ｇを構成し、爪状部４ａが適宜の弾性を備えるようにしてもよい。また、爪状部４ａ…の断面を除変して、爪状部４ａ…が全体的に弾性変形して可撓性を備えるように構成してもよい。そのように構成すれば、薄肉の可撓体を成形しにくい材質であっても採用できるという利点がある。
【００５１】
なお、上記の説明でフィン２ｅ…を三角リブ状とする例で説明したが、このように構成すれば、樹脂成形に好適となり、材料の使用量も減らすことができる利点がある。しかし、フィン２ｅ…の形状はこれに限るものではなく、例えば軸状部２ｃの直径を板状部２ｂの近傍で漸増させ、その上にフィン２ｅ…を形成してもよい。このように構成すれば、板状部２ｂの剛性を高めることができるとともに、フィンの高さを低くすることができるので、樹脂成形時のひけやゆがみを低減できて高精度に成形できるという利点がある。
【００５２】
なお、上記の説明では、雌型継手３を係止爪部材４とハウジング５に分割して構成する例で説明したが、このように構成すると比較的成形が容易となるからであって、可能なら分割せずに一体成形したり、別の分割の仕方を採用してもよいことは言うまでもない。
【００５３】
なお、上記の説明では、被接合部材としてトンネル覆工に用いる鉄筋コンクリート製のセグメントの例で説明したが、本発明はこのような用途のみに限定されるものでなく、他の部材間の接合にも適用できることは言うまでもない。
【００５４】
【発明の効果】
以上に述べたように、請求項１に記載の発明では、継手部材を雌型継手に押し込むことによって、係合突条と爪状部を係合させることができるから、継手部材と被接合部材の係合が容易であり、その結果、被接合部材同士の接合を容易に行うことができ、接合作業の効率を向上することができるという効果を奏する。
さらに、継手部材を受け穴に挿着部をがたなく挿着させ、被接合部材のずれに伴う接合面方向の荷重は板状部で担荷され、被接合部材の引張りに伴う引張方向の荷重は軸状部で担荷されるようにするので、被接合部材の受け穴の奥に挿入される部分を軸状部とすることができ、その結果、雌型継手をコンパクトに構成でき、適用可能な被接合部材の厚さの範囲を広げられるという効果を奏する。
【００５５】
請求項２に記載の発明では、形状の複雑な係止爪部材を別体で設けることができるから、雌型継手の製作が容易となり、低コストの継手構造を提供できるという効果を奏する。
【００５６】
請求項３に記載の発明では、鉄筋が係止のための構造を兼ねることができるから、鉄筋コンクリートで被接合部材を製作する際に、型枠が簡素になり低コストでの製作が可能となるという効果を奏する。
【００５７】
請求項４に記載の発明では、ハウジングが引抜力を受けても鉄筋によって支持されるため、ハウジングが被接合部材内に高強度に保持されるから、ハウジングにコンクリートとの密着性がよくない材質を用いても、高い引抜力に耐える継手構造を提供することができるという効果を奏する。
【図面の簡単な説明】
【図１】本発明に係る継手構造の実施の形態を示す断面図である。
【図２】本発明に係る継手部材の詳細構成を説明するための説明図およびその断面図である。
【図３】本発明に係るハウジングの構成を示す断面図および側面図である。
【図４】本発明に係る係止爪部材の構成を示す側面図および断面図である。
【図５】本発明に係るヒンジ部を示す拡大断面図である。
【図６】ヒンジ部の変形例を示す拡大断面図である。
【図７】トンネル覆工に用いるセグメントの組立の様子を示す説明図である。
【符号の説明】
１セグメント（被接合部材）
１ａ接合面
１ｂ受け穴
２継手部材
２ａ係合突条
２ｂ板状部
２ｃ軸状部
２ｄ挿着部
２ｅフィン
２ｆ、４ｄ係止面
３雌型継手
４係止爪部材
４ａ爪状部
４ｂリング状固定部
４ｃ円弧面
４ｇヒンジ部
６鉄筋[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure using male and female joints, and more particularly to a joint structure that facilitates automatic coupling and that is particularly suitable for joining tunnel segment blocks.
[0002]
[Prior art]
Conventionally, in tunnel construction, a segment made of steel, reinforced concrete or the like is joined in a cylindrical shape to form a lining. FIG. 7 shows an outline of the assembly.
[0003]
Reference numeral 31 denotes a segment, which is adjacent in the circumferential direction and is joined to the joining surface 31 a of the existing segment 31 from the direction of the arrow and extended in the joining direction to form a segment ring 30.
[0004]
In such a joining method on the joining surface 31a, for example, as described in Patent Document 1, a method of fastening the joining surfaces with bolts and nuts, a hole is provided in the joining surface, and a pin member is fitted. There was a method of fixing by adhesion. Further, as described in Patent Document 2, there is a system in which a triangular pyramid-shaped guide pin is closely fitted into a triangular pyramid-shaped hole and fitted.
[0005]
[Patent Document 1]
JP-A-7-238789 (page 2-4, FIGS. 1-4, FIG. 9)
[Patent Document 2]
JP-A-10-169380 (page 2-4, FIG. 1-2)
[0006]
[Problems to be solved by the invention]
However, these conventional joint structures have the following problems.
In the bolt and nut fastening described in Patent Document 1, fastening is performed from the inside of the tunnel in a state where the segments are opposed to each other.
In addition, the methods using the pin members described in Patent Documents 1 and 2 require high positional accuracy between the pin member and the fitting hole in order to fit the pin member in close contact with each other. As a result, the production cost of the segments is high, and there is a problem that the workability is poor because it takes time to align the positions during the joining operation. In addition, since the pin member is fixed when fitted to one segment, there is a problem that when the other segment is pushed in, the position is slightly shifted and the other segments are damaged. Further, since the conventional joint structure is not suitable for resinization, there is a problem that it cannot be manufactured at low cost by resinization.
[0007]
The present invention has been made in view of such problems, and an object of the present invention is to provide a joint structure in which joining workability is improved and manufacturing at low cost is possible.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, in the invention described in claim 1, in the pair of members to be joined to each other, a receiving hole formed by recessing each joining surface, and on the back side of the receiving hole A joint structure comprising a fixed female joint, wherein the members to be joined are joined to each other through a joint member that can be engaged with the female joint, and the joint is joined. A member is provided with a shaft-like portion provided with engagement protrusions that can be engaged with the female joint at both ends in the longitudinal direction, and at the center of the shaft-like portion so as to be orthogonal to the shaft-like portion. When the joint is engaged, a thickness direction is provided between the plate-like portion and the shaft-like portion that are accommodated across both of the opposed receiving holes. An insertion part having a fin placed at a position where the part bites into the receiving hole, and the female joint includes the joint part A ring-shaped fixing portion through which the engaging protrusion of the ring can pass, and an inclination extending from the ring-shaped fixing portion so as to sag toward the inner side, and allowing the ring-shaped fixing portion to extend toward the outer periphery of the ring. A plurality of claw-shaped portions having a flexible elasticity and whose ends can be locked to the engaging protrusions of the joint member.
Therefore, by pushing the joint member into the female joint, the engagement protrusion and the claw-like portion can be engaged, and in this state, the joint member is inserted into the receiving hole without a backlash, The load in the joining surface direction accompanying the displacement of the joining member is carried by the plate-like portion, and the load in the tensile direction accompanying the pulling of the joined member is carried by the shaft-like portion.
[0009]
According to a second aspect of the present invention, in the joint structure according to the first aspect, the female joint includes a housing that is locked to the member to be joined, and a locking claw member that is detachably provided on the housing. The latching claw member is composed of the ring-shaped fixing part and the claw-like part.
For this reason, the engaging claw member having a complicated shape can be provided separately.
[0010]
According to a third aspect of the present invention, there is used the joint structure according to the second aspect, wherein the member to be joined is made of reinforced concrete and the housing is locked to the reinforcing bar of the member to be joined.
Therefore, the reinforcing bars can also serve as a structure for locking.
[0011]
In invention of Claim 4, in the joint structure of Claim 1 or 2, the said to-be-joined member is comprised by reinforced concrete, and the structure by which the rebar of this to-be-joined member is distribute | arranged in the direction where the said housing is pulled out is comprised. Use.
Therefore, since the housing is supported by the reinforcing bars even if it receives the pulling force, the housing is held with high strength in the member to be joined.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the member which is the same or it corresponds through all the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a joint structure according to the present invention, and shows a cross section in the thickness direction of a segment 1 (member to be joined).
The segment 1 is made of reinforced concrete, and the reinforcing bars 6 are arranged in a frame shape inside. The joint surface 1a is recessed in a mortar shape having a conical inner surface, and a plurality of receiving holes 1b in which a cylindrical hole is provided on the back side are provided in the width direction of the segment 1, and a female joint 3 is provided on the back side. Is fixed. Similar joint holes 1b and female joints 3 are provided on the joint surface 1a opposite to the joint surface 1a, which is omitted in the drawing, and the other segments 1 joined to the segment 1 have the same structure. I have. The segments 1 are joined to each other by engaging the female joint 3 with the joint members 2 that are extended in the shape of shafts and can be engaged with the female joint 3 at both ends. FIG. 1 shows a state in which a joint member 2 is pushed into and engaged with a female joint 3 of one segment 1.
[0013]
The joint surface 1a is usually provided with a plurality of receiving holes 1b, and there are a plurality of joint members 2 engaged therewith. However, if necessary, a single member may be provided.
[0014]
First, the detailed configuration of the joint member 2 will be described.
FIG. 2A is an explanatory diagram for explaining a detailed configuration of the joint member 2. FIG. 2B is a sectional view taken along the line AA, and FIG. 2C is a sectional view taken along the line BB. The joint member 2 includes a shaft-shaped portion 2c extending in a columnar shape, engaging protrusions 2a and 2a provided at both ends thereof, and is coaxial with the shaft-shaped portion 2c at the center and orthogonal to the shaft-shaped portion 2c. And a plate-like portion 2b made of a disc flange. The plate-like portion 2b has a size slightly smaller than the size of the opening of the receiving hole 1b. In addition, the thickness is a thickness that is accommodated in both the opposing receiving holes 1b and 1b in the thickness direction when the joint is engaged. For example, the joint surfaces 1a and 1a are slipped and displaced in the joint surface direction. In this case, the inner surface of the receiving hole 1b is in contact with the outer peripheral portion of the plate-like portion 2b.
[0015]
Further, between the plate-like portion 2b and the shaft-like portion 2c, triangular rib-like fins 2e parallel to the axial direction of the shaft-like portion 2c and aligned in two directions orthogonal to each other are appropriately spaced. Is provided.
[0016]
The engaging ridges 2a and 2a are ridges coaxial with the shaft-like portion 2c, the end side is a truncated cone shape having a taper 2g, and the locking surface 2f perpendicular to the shaft-like portion 2c is formed on the center side. Has been. The outer diameters of the engaging ridges 2a and 2a are smaller than the inner diameter of the receiving hole 1b and smaller than the cylindrical hole provided at the bottom of the receiving hole 1b, and each has a size that can be penetrated.
[0017]
In the fins 2e, the trapped surfaces connecting the oblique sides form a truncated cone, and can be inserted into the receiving hole 1b without rattling. An insertion portion 2d that restricts the inclination of 2c is configured. Specifically, when the joint member 2 is just engaged with the female joint 3, the insertion portion 2d slightly bites into the inside of the segment 1 from the inner surface of the receiving hole 1b and has a positional relationship. . For this purpose, the tip of the oblique side of the fins 2e... Is configured to be deformed or worn when pressed against the inner surface of the receiving hole 1b, so that the receiving hole 1b is not in close contact.
[0018]
In order to realize the deformation or wear of the tip of the hypotenuse of the fin 2e with as little pressing force as possible, for example, it is easy to bend using a material having a relatively low Young's modulus, or wear easily using a relatively fragile material. It is effective to reduce the plate thickness toward the tip, or to make the tip comb-like.
[0019]
Since the fins 2e are configured so that the mold can be divided in two directions as described above, it is easy to integrally mold the joint member 2 and, in particular, the mold production is simplified, so that the cost is low. There is an advantage that can be manufactured with.
[0020]
Next, the detailed configuration of the female joint 3 will be described. The female joint 3 is locked inside the segment 1 and secures a space for accommodating the joint member 2 inside when engaged, and a locking claw member attached to the housing 5 by a screw so as to be detachable. It consists of four. 3A is an axial cross-sectional view of the housing 5, and FIG. 3B is a side view in the C direction of FIG. 3A. 4A is a left side view of the locking claw member 4 viewed from the inside of the segment 1 when engaged, and FIG. 4B is a sectional view taken along the line DD in FIG. FIG. 4C is a right side view of the segment 1 as viewed from the outside.
[0021]
As shown in FIG. 3, the housing 5 is a cap-shaped member having a cylindrical cross section having an opening on one side, and includes a space for accommodating the locking claw member 4 and the joint member 2 when engaged. In the opening, a female screw 5a that can be screw-fitted with the locking claw member 4 is formed on the inner peripheral side, and a flange portion 5b is provided on the outer peripheral side.
[0022]
As shown in FIG. 4, the locking claw member 4 is provided with four claw-like portions 4 a... On the inner periphery of the ring-shaped fixing portion 4 b via hinge portions 4 g.
[0023]
The ring-shaped fixing portion 4b has a ring inner diameter that allows the engagement protrusion 2a of the joint member 2 to pass therethrough, and a male screw 4f that can be screwed into the female screw 5a of the housing 5 is provided on the outer periphery of the ring. . Further, a chamfer is provided on the entire circumference of the ring opening on the side where the joint member 2 is inserted.
[0024]
As shown in FIG. 5 as an enlarged view of the E portion in FIG. 4 (b), the hinge portion 4g ... connects the ring-like fixing portion 4b and the claw-like portion 4a ... at the inner periphery of the ring-like fixing portion 4b. The claw-like parts 4a are provided with elasticity that can be restored and rotated about the hinge parts 4g.
[0025]
The claw-like portions 4a are divided into four in the axial direction after a part of a conical tube extending obliquely from the hinge portions 4g to the central axis direction of the ring-shaped fixing portion 4b is cut. In a state where no external force is applied, the end of the claw-like portion 4a ... on the hinge 4g ... side is substantially parallel to the side of the ring-like fixing portion 4b, and a gap w is formed between them. The other end of the claw-like portion 4a is provided with a locking surface 4d aligned on a plane substantially perpendicular to the ring central axis. In the ring center axis direction, arcuate surfaces 4c aligned with a circle having substantially the same diameter as the shaft-like portion 2c of the joint member 2 are formed.
[0026]
The inclination of the claw-like part 4a with respect to the shaft-like part 2c depends on the thickness of the claw-like part 4a, but is desirably gradual, and is preferably 45 ° at most, more preferably 30 ° or less. In addition, from the relationship between the inner diameter of the ring-shaped fixing portion 4b described above and the outer diameter of the engaging protrusion 2a, it cannot be 0 ° even if it is the most loose. The thickness of the claw-like portion 4a is set to an appropriate thickness in consideration of the buckling strength and the compressive strength in the extending direction of the claw-like portion 4a.
[0027]
The locking claw member 4 is screwed into the housing 5 to form the female joint 3, and is embedded in the bottom of the receiving hole 1b. As shown in FIG. 1, the receiving hole 1 b is provided between the reinforcing bars 6 arranged in parallel to the joint surface 1 a, and the female joint 3 has a flange 5 b of the housing 5 that contacts the back side of the reinforcing bar 6. It arrange | positions so that it may contact | connect.
[0028]
Since the flange portion 5b has an elliptical plate shape, when the housing 5 is disposed in the mold, the direction in which the flange portion 5b extends is parallel to the reinforcing bar 6 and the interval between the reinforcing bars 6 is passed. The collar portion 5b can be arranged by the procedure of rotating the collar portion 5b by 90 ° so that the collar portion 5b abuts the reinforcing bar 6, and there is an advantage that the setting to the formwork becomes easy. For this purpose, it is sufficient if the collar portion 5b is provided so as to extend in one direction. For example, it may be a rectangular plate or the like, and is not limited to an elliptical plate.
[0029]
The joint member 2, the locking claw member 4, and the housing 5 that have been described above can be made of a single material such as engineering plastic or super engineering plastic, an alloy, or a synthetic resin containing reinforcing fibers. . Any of these materials may be used according to the required strength, and the materials used for each member may be different from each other. Furthermore, it goes without saying that metal members may be inserted and outserted.
[0030]
In particular, in order to manufacture at a lower cost, it is preferable to employ a material that can be integrally formed. In that case, in order to facilitate molding or reduce the amount of material used, a cylindrical shape in which the center of the shaft-like portion 2c depicted as a solid shaft in FIG.
[0031]
In the above configuration, since the female joint 3 is divided into the housing 5 and the locking claw member 4 that is detachably provided on the housing 5, for example, the housing 5 is resistant to being embedded in concrete. A chemical and water-resistant material is used, and the locking claw member 4 is made of a material having elasticity that makes it easy to form the hinge portion 4g, or a high fluidity that facilitates complicated integral molding of the claw-like portion 4a and the like. It has the advantage that it can be used properly, such as using materials.
[0032]
In addition, since the engagement between the locking claw member 4 and the housing 5 is screw fitting, the assembly is facilitated, and the fitting strength is appropriately set by appropriately adjusting the screw pitch and the thread length. Is possible.
[0033]
Next, the engaging operation of the joint structure according to the present invention will be described.
First, the tip of the joint member 2 is inserted from the opening of the receiving hole 1b. Since the outer diameter of the engaging protrusion 2a is smaller than the inner diameter of the receiving hole 1b, it can be inserted even if it is misaligned in the joining surface direction within the range of the diameter difference. Further, since the taper 2g is provided at the tip, the contact with the opening and the inner surface of the receiving hole 1b is smooth.
[0034]
When the insertion is further continued, the taper 2g hits the inner surface of the claw-shaped portion 4a ..., the claw-shaped portion 4a ... receives external force from the joint member 2 in the ring outer peripheral direction and is pushed outward, and the claw-shaped portion 4a ... And pass through the range of the engaging protrusion 2a.
[0035]
At this time, the claw-like portions 4a ... are only protruding from the end face of the ring-shaped fixing portion 4b and the gap w, so that the claw-like portions 4a ... are pushed outward and rotated beyond the gap w. When it tries to move, the end of the claw-shaped portion 4a ... and the end surface of the ring-shaped fixing portion 4b come into contact with each other, and the hinge portion 4g is locked. Therefore, when excessive misalignment occurs during insertion, the misalignment is regulated by receiving resistance from the locked hinge portion 4g.
[0036]
After passing through the engaging protrusion 2a, the external force in the ring outer peripheral direction received by the claw-like portion 4a ... disappears, so that the claw-like portion 4a ... returns to the state before deformation by the elastic reaction force of the hinge portion 4g ... . Accordingly, the locking surface 4d of the claw-like portion 4a and the locking surface 2f of the joint member 2 face each other and are engaged with each other in the axial direction of the joint member 2.
[0037]
On the other hand, if the insertion portion 2d of the joint member 2 approaches the inner surface of the receiving hole 1b in the process of inserting the joint member 2, if there is a misalignment, they are brought into contact with each other and movement in the joining surface direction is restricted. Therefore, misalignment is corrected as insertion proceeds.
[0038]
Further, immediately before the engagement is completed, the insertion portion 2d and the inner surface of the receiving hole 1b are in contact with each other. Therefore, although the insertion load of the joint member 2 increases, if the insertion is further continued, the tip of the oblique side of the fin 2e ... comes into strong contact with the inner surface of the receiving hole 1b, and the fin 2e ... is bent or the tip is rubbed and worn away. As a result, it is inserted in a state of being closely guided to the receiving hole 1b. Therefore, in a state where the joint member 2 and the locking claw member 4 are engaged, the insertion portion 2d and the receiving hole 1b are simultaneously engaged while the movement in the joining surface direction is restricted.
[0039]
In this way, when the joint member 2 is pushed in along the receiving hole 1b, the normal direction of the joint surface and the joint surface direction are simultaneously and automatically engaged with the segment 1, and the posture thereof is Fixed. As described above, the segment 1 engaged with the joint member 2 is pushed into the receiving hole 1b of the other segment 1 so that the joint member 2 engaged with the joint surface 1a is pressed against each other. As a result, the joining of the segments 1 is completed.
[0040]
Thus, according to the present invention, there is an advantage that the joint member 2 can be inserted very easily. Even when a machine is used, since only a device for pushing in one direction is required, there is an advantage that a joining operation can be performed using a very simple device.
[0041]
Next, the operation after the completion of bonding will be described.
As for a pair of segments 1 joined to each other, for example, an external force such as an earthquake acts as a shearing force that shifts the segments 1 and 1 in the joining surface direction, and a tensile force that pulls the joining surfaces of the segments 1 and 1 apart. It can be considered separately when it acts. In the general case, they are understood to act in combination.
[0042]
First, when receiving a shearing force, when the joint member 2 according to the present invention is engaged, the insertion portion 2d is inserted in close contact with the receiving hole 1b, so that it is rigidly integrated with each segment 1. Therefore, the shear force acts intensively on the positions of the joint surfaces 1a and 1a. In the present invention, since the plate-like portion 2b having a size slightly smaller than the size of the opening of the receiving hole 1b is disposed at that position, a relatively large shearing force can be carried. Since the other portions are axial and have a relatively small cross-sectional area, there is an advantage that the shear external force can be effectively resisted with a small amount of material as a whole.
[0043]
Next, when receiving the tensile force, it goes without saying that the joint member 2 and the claw-like portions 4a... Are designed to withstand predetermined tensile stress and compressive stress, respectively. Furthermore, in the present invention, when the claw-like portions 4a ... receive a load from the engaging protrusion 2a, the claw-like portions 4a ... are provided with being inclined at a shallow angle with respect to the axial direction of the joint member 2, The structure is difficult to buckle. Further, the locking surface 2f and the locking surface 4d are in contact with each other as a plane perpendicular to the shaft-shaped portion 2c, and since there is no compressive force component in the contact surface, the claw-shaped portions 4a. There is no slipping off. Therefore, the engagement between the claw-like portions 4a and the joint member 2 has an advantage that the segment 1 is stable even when it receives a tensile force.
[0044]
Further, since the hinge portion 4g is made of a thin flexible body, when the segment 1 is pulled and the claw-like portions 4a are compressed, the hinge portion 4g protrudes in the ring inner peripheral direction, and the claw-like portions 4a ... Since the end of the ring and the end face of the ring-shaped fixing part 4b are in direct contact with each other to transmit the load and the hinge part 4g can escape the compression load, the hinge part 4g is compressed and damaged even if a strong compression load occurs. There is an advantage that there is no.
[0045]
Further, when receiving a tensile force, the housing 5 also receives a tensile force in the direction of being pulled out from the segment 1 via the locking claw member 4. In the present invention, since the flange portion 5b of the housing 5 is embedded in contact with the reinforcing bar 6, the reinforcing bar 6 functions as a retaining member. Therefore, there is an advantage that the tensile force can be resisted even if the adhesion between the housing 5 and the concrete is not so strong.
[0046]
In addition to the above, in order to prevent the housing 5 from coming off, for example, a shape such as a rib shape, a fin shape, or an unevenness that serves as a pulling resistance may be added to the outside of the housing 5.
[0047]
In the above description, the collar portion 5b is simply brought into contact with the reinforcing bar 6. However, it is more effective to provide the housing 5 with a locking portion having a groove shape for locking the reinforcing bar 6 or the like. is there. In this case, since the housing 5 can be locked to the reinforcing bar 6, there is no need to support the housing 5 when the housing 5 is embedded, so that there is an advantage that the formwork of the segment 1 can be configured more simply.
[0048]
In the above description, the claw-like portion 4a... Has been described as an example in which the conical tube is divided into four parts, but it goes without saying that it is not limited to four parts. As the number of divisions increases, the hinge portions 4g become more linear, and there is an advantage that suitable elasticity is easily obtained even if the hinge portion 4g is made thick.
[0049]
As described above, according to the present invention, the members to be joined can be easily joined, the efficiency of joining work can be improved, and is particularly suitable for automatic joining. In addition, the shearing force and tensile force acting on the joint member are each carried by the plate-like part and the shaft-like part to improve the material placement, reduce the amount of material used, and insert into the receiving hole of the joined member By making the portion to be a shaft-shaped portion having a relatively small cross-sectional area, the female joint can be configured in a compact manner, and the applicable range of the thickness of the member to be joined can be expanded.
[0050]
The hinge portion 4g has been described as an example of a thin flexible body as shown in FIG. 5, but when the joint member 2 is inserted, the hinge portion 4g is pushed open by the engagement protrusion 2a in the ring outer peripheral direction. If the engagement protrusion 2a passes through and returns to the original position by the elastic restoring force, the configuration is not limited. For example, as shown in FIG. 6, the claw-like portion 4a is narrowed at the connection portion with the ring-shaped fixing portion 4b to form the hinge portion 4g, and the claw-like portion 4a has appropriate elasticity. Also good. Further, the cross-section of the claw-like portions 4a may be changed so that the claw-like portions 4a are elastically deformed as a whole and have flexibility. If comprised in that way, even if it is a material which is hard to shape | mold a thin flexible body, there exists an advantage that it can employ | adopt.
[0051]
In the above description, the example in which the fins 2e are triangular ribs has been described. However, if configured in this way, there is an advantage that it is suitable for resin molding and the amount of material used can be reduced. However, the shape of the fins 2e is not limited to this. For example, the diameter of the shaft-like portion 2c may be gradually increased in the vicinity of the plate-like portion 2b, and the fins 2e ... may be formed thereon. If comprised in this way, while the rigidity of the plate-shaped part 2b can be improved, the height of a fin can be made low, Therefore The advantage that the sink and the distortion at the time of resin molding can be reduced, and it can shape | mold with high precision. There is.
[0052]
In the above description, the example in which the female joint 3 is divided into the locking claw member 4 and the housing 5 has been described. However, this configuration is relatively easy, and is possible. Therefore, it goes without saying that it may be integrally formed without dividing, or another dividing method may be adopted.
[0053]
In the above description, the example of the reinforced concrete segment used for the tunnel lining as the member to be joined has been described. However, the present invention is not limited to such an application, and may be used for joining between other members. It goes without saying that is also applicable.
[0054]
【The invention's effect】
As described above, in the invention according to claim 1, since the engaging protrusion and the claw-shaped portion can be engaged by pushing the joint member into the female joint, the joint member and the member to be joined As a result, the members to be joined can be easily joined to each other, and the efficiency of joining work can be improved.
Furthermore, the joint member is inserted into the receiving hole without any insertion, and the load in the joining surface direction accompanying the displacement of the joined member is borne by the plate-like part, and the tensile direction accompanying the tension of the joined member is Since the load is carried by the shaft-shaped portion, the portion inserted into the back of the receiving hole of the joined member can be a shaft-shaped portion, and as a result, the female joint can be configured compactly, There is an effect that the thickness range of the applicable members to be joined can be expanded.
[0055]
According to the second aspect of the present invention, since the engaging claw member having a complicated shape can be provided separately, it is easy to manufacture the female joint, and there is an effect that a low-cost joint structure can be provided.
[0056]
In the invention according to claim 3, since the reinforcing bar can also serve as a structure for locking, when the member to be joined is manufactured with the reinforced concrete, the formwork becomes simple and can be manufactured at low cost. There is an effect.
[0057]
In the invention according to claim 4, since the housing is supported by the reinforcing bar even when the housing is subjected to the pulling force, the housing is held at a high strength in the member to be joined. Even if this is used, it is possible to provide a joint structure that can withstand a high pulling force.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a joint structure according to the present invention.
FIG. 2 is an explanatory view and a cross-sectional view for explaining a detailed configuration of a joint member according to the present invention.
FIG. 3 is a cross-sectional view and a side view showing a configuration of a housing according to the present invention.
FIGS. 4A and 4B are a side view and a cross-sectional view showing a configuration of a locking claw member according to the present invention. FIGS.
FIG. 5 is an enlarged sectional view showing a hinge portion according to the present invention.
FIG. 6 is an enlarged cross-sectional view showing a modification of the hinge portion.
FIG. 7 is an explanatory view showing a state of assembling segments used for tunnel lining.
[Explanation of symbols]
1 segment (members to be joined)
DESCRIPTION OF SYMBOLS 1a Joint surface 1b Receptacle hole 2 Joint member 2a Engagement protrusion 2b Plate-shaped part 2c Shaft-shaped part 2d Insertion part 2e Fin 2f, 4d Locking surface 3 Female joint 4 Locking claw member 4a Claw-shaped part 4b Ring shape Fixed part 4c Arc surface 4g Hinge part 6 Rebar

Claims

A pair of members to be joined to each other are provided with a receiving hole formed by recessing each joining surface and a female joint fixed to the back side of the receiving hole, and engaged with the female joint. A joint structure for joining the joined members so as to face the joining surfaces through the joint members made possible,
The joint member is
A shaft-like portion provided with engagement protrusions that can be engaged with the female joint at both ends in the longitudinal direction;
A plate-like portion that is provided in the center of the shaft-like portion and orthogonal to the shaft-like portion, and that is accommodated across both the receiving holes opposed to each other in the thickness direction when the joint is engaged;
An insertion portion provided between the plate-like portion and the shaft-like portion, and having a fin placed at a position where a part of the tip bites into the receiving hole when the joint is engaged;
The female joint is
A ring-shaped fixing portion through which the engaging protrusion of the joint member can pass;
The ring-shaped fixing portion has an elasticity that extends in a slanting manner so as to sag from the ring-shaped fixing portion, and is flexible in the ring outer peripheral direction of the ring-shaped fixing portion. A joint structure comprising a plurality of claw-like portions whose tips can be locked to each other.

In the joint structure according to claim 1,
The female joint is
A housing locked to the joined member;
It consists of a locking claw member detachably provided on the housing,
A joint structure in which the locking claw member is provided with the ring-shaped fixing portion and the claw-shaped portion.

In the joint structure according to claim 2,
The member to be joined is made of reinforced concrete,
A joint structure in which the housing is locked to the reinforcing bar of the member to be joined.

In the joint structure according to claim 1 or 2,
The member to be joined is made of reinforced concrete,
A joint structure configured such that the reinforcing bars of the members to be joined are arranged in a direction in which the housing is pulled out.