JP3877390B2

JP3877390B2 - Tunnel segment connection structure

Info

Publication number: JP3877390B2
Application number: JP25584597A
Authority: JP
Inventors: 勝彦向野; 和則辻本; 勉今野
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 1997-09-22
Filing date: 1997-09-22
Publication date: 2007-02-07
Anticipated expiration: 2017-09-22
Also published as: JPH1193587A

Description

【０００１】
【発明の属する技術分野】
本発明は、トンネル周方向に隣接させて組付けられる第１セグメント本体及び第２セグメント本体が、夫々の突合せ部を突合わせた状態で対向するように、第１被挟持部を形成する第１アリ溝部および第２被挟持部を形成する第２アリ溝部を個別に設けると共に、トンネル長手方向の端部から前記第１アリ溝部および第２アリ溝部に各別に嵌入目在であると共に、互いの間隔が嵌入方向前方側ほど広く構成してある第１挟持部と第２挟持部とを両側に備え、且つ、トンネル長手方向に隣接する既設セグメント本体あるいはセグメント押込装置に接当可能であって、前記第２セグメント本体を既設セグメント本体に押し付ける際に、前記既設セグメント本体あるいは前記押込装置から一定以上の荷重を受けた場合に変形可能な突出部材を嵌入方向後端に設けた連結具を、前記第１アリ溝部および第２アリ溝部に挿入することで、前記第１挟持部が前記第１被挟持部に当接し、前記第２挟持部が前記第２被挟持部に当接して、前記夫々の突合せ部を相対的に近接させるトンネル用セグメントの連結構造に関する。
【０００２】
【従来の技術】
従来、この種のトンネル用セグメントの連結構造は、例えぱ、図４〜図６に示すものがあった。
即ち、あらかじめ第１アリ溝部Ｍ１に連結具Ｒを挿入した第１セグメント本体Ｓ１を先に構築しておき、この第１セグメント本体Ｓ１の突合せ部１から突出した連結具Ｒに第２セグメント本体Ｓ２の第２アリ溝部Ｍ２を外挿させつつ、第２アリ溝部Ｍ２を既設セグメント本体Ｓ３の側に押し込むことで、前記連結具Ｒが第１被挟持部ｍ１と第２被挟持部ｍ２とを引きつけて第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを連結するいわゆる先付方式を可能にするものがあった。
【０００３】
ここで用いる連結具Ｒは、例えば図５に示すごとく略矩形状であって、当該連結具Ｒの挿人方向に沿った両縁部には第１挟持部ｒ１および第２挟持部ｒ２が形成してある。これら第１挟持部ｒ１および第２挟持部ｒ２は平板状の胴部ｒ３で連接されている。特に、第２挟持部ｒ２は、第２アリ溝部Ｍ２に挿入されて第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを引付け連結するよう前記連結具Ｒの挿入方向奥側ほど広がった状態に形成してある。
また、連結具Ｒには、既設セグメント本体Ｓ３に接当可能な突出部材Ｔをその嵌入方向後端に備えている。当該突出部材Ｔは、前記第２挟持部ｒ２の端部に設け、その突出方向は前記第１挟持部ｒ１の延出方向と略平行に設定してある。前記突出部材Ｔは、例えば中空の円筒部材で構成し、所定の押圧力で例えば図６に示すごとく、前記既設セグメント本体Ｓ３に押し付けられる際に圧縮変形する。つまり、当該突出部材Ｔが圧縮変形することで連結具Ｒが既設セグメント本体Ｓ３の側に移動し、後述するごとく、前記第１セグメント本体Ｓ１と前記第２セグメント本体Ｓ２とを略一定力で引付け連結する。前記突出部材Ｔは前記第２挟持部ｒ２の後端に対して嵌入させて固定したり、接着剤等を用いて接着固定してある。
【０００４】
前記第１セグメント本体Ｓ１に対する前記第２セグメント本体Ｓ２の取付け態様を図４（イ）〜（二）に示す。ここでは、双方のセグメント本体の突合せ部１に形成したアリ溝部のうち、特に既設セグメント本体Ｓ３の側のアリ溝部に係る例を示す。また、説明を簡単にするために、各部材どうしの当接部には摩擦力は発生しないものとする。
図４（イ）は、既に構築が終了した前記第１セグメント本体Ｓ１と、当該第１セグメント本体Ｓ１の第１アリ溝部Ｍ１に挿入されている前記連結具Ｒとに対し、前記第２セグメント本体Ｓ２を近接させる過程を示している。この過程においては、前記連結具Ｒと前記第２セグメント本体Ｓ２とは未だ当接していない。
前記連結具Ｒを取付ける際には、突出部材Ｔを設けていない側の第１挟持部ｒ１を前記第１アリ溝部Ｍ１に挿入し、前記突出部材Ｔを設けた第２挟持部ｒ２は突合せ部１から突出させておく。本構成であれば、後で第２セグメント本体Ｓ２を押込む際に、突出部材Ｔの軸芯と第２セグメント本体Ｓ２への押込み力の作用線とが略同軸芯上に位置することとなるから、前記第２セグメント本体Ｓ２の押込みによって連結具Ｒにこじりが生じないうえに、連結具Ｒが既設セグメント木体Ｓ３に対して横擦れすることもないから、突出部材Ｔは所期の圧縮力を発樺させつつ圧縮変形することが可能となる。
【０００５】
図４（ロ）は、前記第２セグメント本体Ｓ２の押付けが進み、前記第２アリ溝部Ｍ２が前記連結具Ｒの第２挟持部ｒ２に当接し、同時に、前記突出部材Ｔが前記既設セグメント本体Ｓ３に当接した状態を示している。この状態では、前記第１セグメント本体Ｓ１と前記第２セグメント本体Ｓ２との間に所定の締結力は未だ発生していない。
さらに前記第２セグメント本体Ｓ２を前記既設セグメント本体Ｓ３の側に押込むと、前記第２セグメント本体Ｓ２の平溝部Ｍ２ａが、前記連結具Ｒの第２挟持部ｒ２と前記第１セグメント本体Ｓ１との間に嵌入される。この嵌入は、前記連結具Ｒが前記第１セググメント本体Ｓ１と前記第２セグメント本体Ｓ２とを所定の締結力で引き付けるようになるまで行われる。そして、連結具Ｒと第２セグメント本体Ｓ２とは一定の相対位置関係を維持したまま既設セグメント本体Ｓ３の側に移動する。この移動は、前記突出部材Ｔが既設セグメント本体Ｓ３に当接するまで、即ち、図４（ハ）の状態になるまで行われる。
図４（ハ）の状態になる以前においては、前記突出部材Ｔに面外圧縮変形は生じない。しかし、この状態からさらに第２セグメント本体Ｓ２を押し込むと、前記突出部材Ｔに圧縮変形が生じる。この結果、連結具Ｒは既設セグメント本体Ｓ３の側に移動し、同時に突合せ部１からの連結具Ｒの突出量が長くなり、第２セグメント本体Ｓ２も既設セグメント本体Ｓ３の側に移動可能となって、第２セグメント本体Ｓ２の押し込みが進行する。尚、図４（ハ）の状態になった以後においては、連結具Ｒが第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを引付ける力は略一定である。
図４（二）は、第２セグメント本体Ｓ２の押し込みが終了した状態を示す。第２セグメント本体Ｓ２の押し込みが確実に行われるためには、図４（二）の状態において、突出部材Ｔは、さらに圧縮変形し得る余裕を残しているか、最大量の圧縮変形がなされた状態であることが必要である。なぜなら、仮に、第２セグメント本体Ｓ２が既設セグメント本体Ｓ３に当接する以前に、突出部材Ｔが最大量の圧縮変形を終了してしまった場合には、第２セグメント本体Ｓ２はもはや既設セグメント本体Ｓ３に当接することができなくなるからである。
【０００６】
以上のごとく、従来のトンネル用セグメントの連結構造には、単に第２セグメント本体Ｓ２を既設セグメント本体Ｓ３の側に押付けるだけで、トンネル周方向Ｙに隣接する第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを、所定の締結力で連結できるものがあった。
【０００７】
【発明が解決しようとする課題】
上記のごとく、突合せ面がトンネルの長手方向Ｘと同方向に延出しているセグメント本体どうしを先付方式で連結する場合には、特に支障なく、第１セグメン卜本体Ｓ１に対する連結具Ｒの摺動、あるいは、第１セグメント本体Ｓ１および連結具Ｒに対する第２セグメント本体Ｓ２の摺動が円滑に行われて、適切な連結部を得ることができる。
しかし、第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との突合せ部１は上記のごとくトンネルの長手方向Ｘに延出するものばかりではなく、例えば、トンネル周方向Ｙに連続した一つのトンネルリングを完成するために最後に連結する所謂キーセグメントでは平面形が略台形状のものがある。この場合の突合せ部１は、トンネルの長手方向Ｘに対して傾斜することになる。一方、前記第１彼挟持部ｍ１および第２披挟持部ｍ２については、このようなキーセグメントであっても、既設セグメント本体Ｓ３に対する押込み方向Ｘ１はトンネルの長手方向Ｘと同方向であるため、前記押込み方向Ｘ１に対して対称に形成される場合が多い。
つまり、突合せ部１と第１披挟持部ｍ１とのなす角度、及び、突合せ部１と第２被挟持部ｍ２とのなす角度は必ずしも同じではなく、前記第１彼挟持部ｍ１等の形成状態によっては、第２セグメント本体Ｓ２を押し込んだ際に、前記連結具Ｒがうまく摺動せず、前記第１セグメント本体Ｓ１と前記第２セグメント本体Ｓ２とを所定の締結力で連結できない場合があった。
【０００８】
本発明の目的は、このような従来技術の欠点を解消し、トンネル周方向Ｙに連結する第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との突合せ部１の延出方向が、第１セグメント本体Ｓ１あるいは第２セグメント本体Ｓ２の押込み方向Ｘ１と異なる場合であっても所定の締結力を確実に発揮し得るトンネル用セグメントの連結構造を提供することにある。
【０００９】
【課題を解決するための手段】
（構成１）
この目的を達成するための本発明に係るセグメント連結構造は、請求項１に記載したごとく、第１セグメント本体と第２セグメント本体との突合せ部が、トンネルの長手方向に対して傾斜しており、第１披挟持部と前記突合せ部との間隔、および、第２被挟持部と前記突合せ部との間隔を、連結具の嵌入方向前方側ほど広く構成した点に特徴を有する。
（作用・効果）
本構成のごとく、例えば第２セグメント本体が略台形状の平面形状を有するいわゆるキーセグメントであって、前記突合せ部がトンネルの長手方向に対して傾斜している場合でも、第１披挟持部と前記突合せ部との問隔、および、第２被挟持部と前記突合せ部との間隔を、何れも連結具の嵌入方向前方側ほど広く構成しておくことで、第２セグメント本体の押し込みが円滑に行われる。
つまり、第２セグメント本体を既設セグメントの側に押し込んだ際には、前記連結具が既設セグメント本体の側に移動し、突合せ部からの当該連結具の突出量が増大する。この結果、第２セグメント本体は更に既設セグメント本体の側に移動することが可能となって、第１セグメント本体と第２セグメント本体とは、所期の締結力をもって確実に連結されることとなる。
【００１０】
【発明の実施の形態】
以下に本発明の実施例を図面に基づいて説明する。
【００１１】
（概要）
本発明のトンネル用セグメントの連結構造の概要を図１に示す。ここでは、例えば、トンネルの長手方向Ｘに対して共に傾斜した突合せ部１を有する第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを、従来技術の項で示した連結具Ｒを用いて締結する例を示す。本実施形態における第２セグメント本体Ｓ２は、例えば、平面形状が略台形状のいわゆるキーセグメントである場合が考えられる。尚、これらのセグメント本体は、例えば、ダクタイルセグメントの他に、コンクリートセグメント、スチールセグメント等を各種のセグメントで構成することができる。
図１に示すごとく、第１セグメント本体Ｓ１の突合せ部１には、トンネルの長手方向Ｘに沿った両端部に第１アリ溝部Ｍ１を夫々形成してある。これらの第１アリ溝部Ｍ１には、連結具Ｒと当接して第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを引付けるための第１被挟持部ｍ１を夫々形成してある。これと同様に、前記第２セグメント本体Ｓ２の突合せ部１にも、トンネルの長手方向Ｘに沿った両端部に第２アリ溝部Ｍ２と第２被挟持部ｍ２とを夫々形成してある。
本実施形態では、図２に示すごとく、トンネルの長手方向Ｘすなわち第２セグメント本体Ｓ２の押込み方向Ｘ１と前記第１被挟持部ｍ１の延出方向とで形成する角度と、前記押込み方向Ｘ１と前記第２被挟持部ｍ２の延出方向とで形成する角度とは等しく構成されているものとする。また、前記第１被挟持部ｍ１と前記第２被挟持部ｍ２との間隔は、後述する連結具Ｒの嵌入方向奥側ほど広くなるように構成してある。
一方、第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との突合せ部１は、前記押込み方向Ｘ１に対して所定の角度を有して傾斜している。
【００１２】
（連結操作）
本実施形態における第２セグメント本体Ｓ２の連結過程は、従来技術で示した図４と基本的に同じである。但し、前述のごと〈、前記突合せ部１は、前記押込み方向Ｘ１に対して所定の角度を有して傾斜している。よって、第２セグメント本体Ｓ２を押し込んだ際に、連結具Ｒが第１アリ溝部Ｍ１に沿って既設セグメント本体Ｓ３の側に摺勤し、第２セグメント本体Ｓ２の第２アリ構部Ｍ２が、既設セグメント本体Ｓ３の側に円滑に移動可能となるためには、前記突合せ部１と前記第１被挟持部ｍ１との相対関係、および、前記突合せ部１と前記第２被挟持部ｍ２との相対関係が重要となる。
【００１３】
図３（イ）（口）には、夫々、第２セグメント本体Ｓ２を押し込み操作している途中の伏態と、押し込み操作が完了した状態とを示してある。尚、第１セグメント本体Ｓ１は既設セグメント本体Ｓ３に対して既に取り付けが終了しているものとする。
本実施形態では、第１アり溝部Ｍ１に形成された第１被挟持部ｍ１が、前記押込み方向Ｘ１となす角度をθ₁とする。また、第１セグメント本体Ｓ１の突合せ部１が、前記押込み方向Ｘ１となす角度をθ₂とする。当該第１アリ溝部Ｍ１には既に連結具Ｒが挿入されている。
一方、第２セグメント本体Ｓ２の突合せ部１が前記押込み方向Ｘ１となす角度は、第１セグメント本体Ｓ１の突合せ部１の場合と同じθ₂である。そして、第２アリ溝部Ｍ２に形成された第２被挟持部ｍ２が、前記押込み方向Ｘ１となす角度をθ₃とする。
【００１４】
図３（イ）は、第２セグメント本体Ｓ２をある程度押し込み、連結具Ｒの第１挟持部ｒ１と第２挟持部ｒ２とが、第１被挟持部ｍ１と第２被挟持部ｍ２とを挟持して、第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とが当接した状態を示している。さらに、説明を容易にするために、図３（イ）は、連結具Ｒの突出部材Ｔがちょうど既設セグメント本体Ｓ３に当接した状態であって、連結具Ｒの縁部ｒｅと第２セグメント本体Ｓ２の縁部Ｓ２ｅとが一致しているとする。
また、突出部材Ｔを除く各部材には一切の変形が生じないものとし、互いに当接する部分には摩擦力が作用しないものとする。
今、図３（イ）の状態から、第２セグメント本体Ｓ２をさらに押し込むと、第２被挟持部ｍ２が連結具Ｒの第２挟持部ｒ２を押圧する。第２セグメント本体Ｓ２が、さらに既設セグメント本体Ｓ３の側に移動するためには、第２セグメント本体Ｓ２と連結具Ｒとが略一体となって既設セグメント本体Ｓ３の側に移動するか、連結具Ｒが既設セグメント本体Ｓ３の側に移動し、第１セグメン卜本体Ｓ１の突合せ部１からの連結具Ｒの突出長さに余裕が生じて、この余裕分だけ第２セグメント本体Ｓ２が既設セグメント本体Ｓ３の側に進入して移動するかの何れかである。
前者としては、前記第１被挟持部ｍ１と前記突合せ部１とか平行である場合が該当する。つまり、θ₁＝θ₂の場合である。この場合には、連結具Ｒが既設セグメント本体Ｓ３の側に移動しても突合せ部１からの連結具Ｒの突出量に変化が生じないから、連結具Ｒと第２セグメント本体Ｓ２との相対位置は変わらない。一方、後者としては、図３（イ）（ロ）に示す場合が該当する。この場合の、連結具Ｒおよび第２セグメント本体Ｓ２の動きは以下のごとくとなる。
図３（ロ）に示すごとく、第２セグメント本体Ｓ２の押し込みによって、連結具Ｒが△ａだけ押し込まれ、連結が終了したとする。この場合、突出部材Ｔは一定の荷重を受けて圧縮変形する。連結具Ｒは既設セグメント本体Ｓ３の側に移動しつつ第２セグメント本体Ｓ２の側にも移動する。この結果、突合せ部１に対する連結具Ｒの縁部の突出量は、
△ａ・（ tanθ₁− tanθ₂）
だけ増加する。つまり、上記移動によって、連結具Ｒは突合せ部１から tanθ₁だけ突出することとなるが、突合せ部１も tanθ₂だけ張り出してくるから、両者の差が連結具Ｒの突出量の増加分となる。
即ち、第２セグメント本体Ｓ２をさらに押し込むためには、
△ａ・（ tanθ₁− tanθ₂）＞０
の関係が成り立つ必要がある。つまり、角度 θ₁＞θ₂ であることが必要となる。
尚、角度θ₁と角度θ₂との関係が、 θ₁＜θ₂ の場合には、連結具Ｒおよび第２セグメント本体Ｓ２を、既設セグメント本体Ｓ３の側にさらに押し込むことは事実上不可能となる。つまり、連結具Ｒを既設セグメント本体Ｓ３の側に押し込むほど、突合せ部１からの連結部突出量が減少して、第２セグメント本体Ｓ２がさらに進入する隙間か生じないからである。この場合、仮に連結具Ｒが既設セグメント本体Ｓ３とは反対方向に移動すれば突合せ部１からの連結具Ｒの突出量は増加するが、連結具Ｒには第２セグメント本体Ｓ２から押し込み力が作用しているため、連結具Ｒが既設セグメント本体Ｓ３に対して反対方向に後退することはあり得ない。
【００１５】
図３（イ）の伏態から図３（ロ）の状態に至るまでの第２セグメント本体Ｓ２の変位量は、以下のとおりである。
連結具Ｒの突出量が △ａ・（ tanθ₁− tan θ₂）だけ増加した場合の、連結具Ｒの縁部に対する第２セグメント本体Ｓ２の突出量を△ｂ₁とすると、
△ｂ₁・（ tanθ₁＋ tanθ₃）＝△ａ・（ tanθ₁− tanθ₂）
となり、
△ｂ₁＝△ａ・（ tanθ₁− tanθ₂）／（ tanθ₁＋ tanθ₃）
となる。
よって、第２セグメント本体Ｓ２の変位量を△ｂ₂とすると、当該△ｂ₂は、連結具Ｒの変位量△ａと上記△ｂ₁とを加えて求めることができる。
【００１６】
尚、上記の説明においては、第２セグメント本体Ｓ２に形成した第２アリ溝部Ｍ２のうち、既設セグメント本体Ｓ３の側の第２アリ溝部Ｍ２についての例を示したが、既設セグメント本体Ｓ３とは反対側の第２アリ溝部Ｍ２の場合であっても押し込み過程は同様に説明することができる。
図２から明らかなごとく、既設セグメント本体Ｓ３とは反対側の第２アリ溝部Ｍ２においては、第２セグメント本体Ｓ２と連結具Ｒとは、例えば、トンネルシールドの押込装置Ｐによって押圧する。この状態は、図３（イ）を左右逆にして見たのと同じとなるからである。
【００１７】
（効果）
以上の説明から明らかなごとく、連結具Ｒを予め第１セグメント本体Ｓ１等に取り付けておく、いわゆる先付け方式を用いて第２セグメント本体Ｓ２を連結する場合には、突合せ部１および第１被挟持部ｍ１、そして、突合せ部１および第２被挟持部ｍ２は連結具Ｒの嵌入方向奥側ほど離間する状態とするのが望ましい。
本発明のトンネル用セグメントの連結構造によれば、その構造が極めて簡単でありながら、既設セグメント本体Ｓ３に対して第２セグメン卜本体Ｓ２を押し込むだけで第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを略一定の締結力で連結することができ、信頼性の高い連結部分を得ることかできる。
【００１８】
〔別実施形態〕
〈１〉上記実施形態では前記突出部材Ｔは前記第２挟持部ｒ２のみに設けたがこれに加えて前記第１挟持部ｒ１の側にも設けることができる。
この場合には、第２セグメント本体Ｓ２を押し込む際の連結具Ｒの回転を確実、に防止することができるから、より適切な連結作業を行うことができる。尚、この場合には、夫々の突出部材Ｔを圧縮変形させるのに必要な荷重の合計が、上記実施形態における単一の突出部材Ｔを圧縮変形させるのに必要な荷重と等しくなるようにしておくとよい。
【００１９】
尚、特許請求の範囲の項に、図面との対照を便利にするために符号を記すが、該記入により本発明は添付図面の構成に限定されるものではない。
【図面の簡単な説明】
【図１】本発明のトンネル用セグメントの連結構造の概要を示す斜視図
【図２】本発明のトンネル用セグメントの連結構造を示す説明図
【図３】第２セグメント本体を連結する過程を示す説明図
【図４】従来技術におけるトンネル用セグメントの連結構造を示す説明図
【図５】連結具の形状を示す平面図
【図６】変形途中の突出部材を示す説明図
【符号の説明】
Ｓ１第１セグメント本体
Ｓ２第２セグメント本体
Ｓ３既設セグメント本体
１突合せ部
Ｍ１第１アリ溝部
Ｍ２第２アリ溝部
ｍ１第１被挟持部
ｍ２第２被挟持部
ｒ１第１挟持部
ｒ２第２挟持部
Ｒ連結具
Ｔ突出部材
Ｙトンネル周方向[0001]
BACKGROUND OF THE INVENTION
In the first aspect of the present invention, the first sandwiched portion is formed such that the first segment body and the second segment body assembled adjacent to each other in the circumferential direction of the tunnel face each other with the butted portions facing each other. The dovetail groove part and the second dovetail groove part forming the second sandwiched part are individually provided, and the first dovetail groove part and the second dovetail groove part are respectively fitted into the first dovetail groove part from the end in the tunnel longitudinal direction, and The first holding part and the second holding part that are configured to be wider toward the front side in the insertion direction are provided on both sides, and can be contacted with an existing segment main body or segment pushing device adjacent in the tunnel longitudinal direction, When pressing the second segment body against the existing segment body, a projecting member that can be deformed when receiving a load of a certain level or more from the existing segment body or the pushing device is inserted. By inserting a connector provided at the rear end into the first dovetail groove portion and the second dovetail groove portion, the first sandwiching portion abuts on the first sandwiched portion, and the second sandwiching portion is the second sandwiching portion. The present invention relates to a connecting structure for tunnel segments that abuts against a sandwiched portion and brings the respective butted portions relatively close to each other.
[0002]
[Prior art]
Conventionally, this type of tunnel segment connection structure is, for example, that shown in FIGS.
That is, the first segment body S1 in which the connector R is inserted into the first dovetail groove M1 is constructed in advance, and the second segment body S2 is connected to the connector R protruding from the butting portion 1 of the first segment body S1. The connecting tool R attracts the first sandwiched portion m1 and the second sandwiched portion m2 by pushing the second dovetail groove portion M2 toward the existing segment body S3 while extrapolating the second dovetail groove portion M2. In some cases, a so-called leading system for connecting the first segment body S1 and the second segment body S2 is possible.
[0003]
The connector R used here has a substantially rectangular shape as shown in FIG. 5, for example, and a first sandwiching portion r1 and a second sandwiching portion r2 are formed at both edges along the insertion direction of the connector R. It is. The first clamping part r1 and the second clamping part r2 are connected by a plate-shaped body part r3. In particular, the second clamping part r2 is inserted into the second dovetail part M2 so as to expand toward the back in the insertion direction of the connector R so as to attract and connect the first segment body S1 and the second segment body S2. It is formed.
Further, the connector R is provided with a projecting member T that can contact the existing segment body S3 at the rear end in the insertion direction. The projecting member T is provided at the end of the second clamping part r2, and the projecting direction is set substantially parallel to the extending direction of the first clamping part r1. The protruding member T is formed of, for example, a hollow cylindrical member, and is compressed and deformed when pressed against the existing segment main body S3 with a predetermined pressing force, for example, as shown in FIG. That is, when the projecting member T is compressed and deformed, the connector R moves toward the existing segment body S3, and pulls the first segment body S1 and the second segment body S2 with a substantially constant force as described later. Connect. The protruding member T is fitted and fixed to the rear end of the second clamping part r2, or is bonded and fixed using an adhesive or the like.
[0004]
The attachment mode of the second segment body S2 with respect to the first segment body S1 is shown in FIGS. Here, the example which concerns on the dovetail part by the side of the existing segment main body S3 among the dovetail part formed in the butting | matching part 1 of both segment main bodies is shown. In addition, in order to simplify the description, it is assumed that no frictional force is generated at the contact portion between the members.
FIG. 4A shows the second segment body with respect to the first segment body S1 that has already been constructed and the connector R that is inserted into the first dovetail groove M1 of the first segment body S1. The process of making S2 approach is shown. In this process, the connector R and the second segment body S2 are not yet in contact with each other.
When attaching the connector R, the first clamping part r1 on the side not provided with the projecting member T is inserted into the first dovetail groove part M1, and the second clamping part r2 provided with the projecting member T is the butting part. Project from 1 If it is this structure, when pushing in 2nd segment main body S2 later, the axial center of the protrusion member T and the action line of pushing force to 2nd segment main body S2 will be located on a substantially coaxial core. From the above, since the connector R is not twisted by the pushing of the second segment main body S2, and the connector R does not rub against the existing segment wooden body S3, the projecting member T is compressed as expected. It becomes possible to compress and deform while generating force.
[0005]
FIG. 4 (b) shows that the pressing of the second segment body S2 proceeds, the second dovetail groove portion M2 comes into contact with the second clamping portion r2 of the connector R, and at the same time, the protruding member T is connected to the existing segment body. The state which contact | abutted to S3 is shown. In this state, a predetermined fastening force has not yet occurred between the first segment body S1 and the second segment body S2.
Further, when the second segment main body S2 is pushed into the existing segment main body S3, the flat groove M2a of the second segment main body S2 is connected to the second clamping part r2 of the connector R and the first segment main body S1. It is inserted between. This insertion is performed until the connector R comes to attract the first segment body S1 and the second segment body S2 with a predetermined fastening force. Then, the connector R and the second segment body S2 move toward the existing segment body S3 while maintaining a certain relative positional relationship. This movement is performed until the protruding member T comes into contact with the existing segment body S3, that is, until the state shown in FIG.
Before the state shown in FIG. 4C, out-of-plane compression deformation does not occur in the protruding member T. However, when the second segment body S2 is further pushed in from this state, the projecting member T is compressed and deformed. As a result, the connector R moves toward the existing segment body S3, and at the same time, the protruding amount of the connector R from the butting portion 1 becomes longer, and the second segment body S2 can also move toward the existing segment body S3. Thus, the pushing of the second segment body S2 proceeds. After the state shown in FIG. 4C, the force with which the connector R attracts the first segment body S1 and the second segment body S2 is substantially constant.
FIG. 4B shows a state in which the second segment body S2 has been pushed. In order to ensure that the second segment body S2 is pushed in, in the state of FIG. 4 (2), the projecting member T has a margin for further compressive deformation, or has been subjected to the maximum amount of compressive deformation. It is necessary to be. Because, if the projecting member T has finished the maximum amount of compressive deformation before the second segment main body S2 contacts the existing segment main body S3, the second segment main body S2 is no longer the existing segment main body S3. It is because it becomes impossible to contact | abut.
[0006]
As described above, in the conventional tunnel segment connection structure, the first segment body S1 and the second segment adjacent to each other in the tunnel circumferential direction Y can be obtained by simply pressing the second segment body S2 against the existing segment body S3. There is one that can connect the main body S2 with a predetermined fastening force.
[0007]
[Problems to be solved by the invention]
As described above, when the segment bodies whose butting surfaces extend in the same direction as the longitudinal direction X of the tunnel are connected to each other by the tipping method, the sliding of the connector R with respect to the first segment rod body S1 is not particularly hindered. The movement or the sliding of the second segment main body S2 with respect to the first segment main body S1 and the connector R can be performed smoothly, and an appropriate connecting portion can be obtained.
However, the abutting portion 1 between the first segment main body S1 and the second segment main body S2 is not limited to the one extending in the longitudinal direction X of the tunnel as described above. Some so-called key segments that are finally connected to complete the plane have a substantially trapezoidal shape. In this case, the butt portion 1 is inclined with respect to the longitudinal direction X of the tunnel. On the other hand, with respect to the first holding part m1 and the second holding part m2, even in such a key segment, the pushing direction X1 with respect to the existing segment body S3 is the same as the longitudinal direction X of the tunnel. It is often formed symmetrically with respect to the pushing direction X1.
That is, the angle formed between the butted portion 1 and the first holding portion m1 and the angle formed between the butted portion 1 and the second sandwiched portion m2 are not necessarily the same, and the formation state of the first he clamped portion m1 and the like In some cases, when the second segment main body S2 is pushed in, the connecting tool R does not slide well, and the first segment main body S1 and the second segment main body S2 cannot be connected with a predetermined fastening force. It was.
[0008]
The object of the present invention is to eliminate the disadvantages of the prior art, and the extending direction of the abutting portion 1 between the first segment body S1 and the second segment body S2 connected in the tunnel circumferential direction Y is the first segment body. An object of the present invention is to provide a connecting structure for tunnel segments that can surely exert a predetermined fastening force even if it is different from the pushing direction X1 of S1 or the second segment body S2.
[0009]
[Means for Solving the Problems]
(Configuration 1)
In order to achieve this object, the segment connection structure according to the present invention is such that the abutting portion between the first segment body and the second segment body is inclined with respect to the longitudinal direction of the tunnel. The distance between the first holding part and the butting part and the distance between the second sandwiched part and the butting part are characterized in that they are configured wider toward the front side in the fitting direction of the connector .
(Action / Effect)
As in this configuration, for example, the second segment main body is a so-called key segment having a substantially trapezoidal planar shape, and the first sandwiching portion and the butt portion are inclined even when the butted portion is inclined with respect to the longitudinal direction of the tunnel. Pushing of the second segment body is smoothed by configuring the gap between the butting portion and the gap between the second sandwiched portion and the butting portion wider toward the front side in the fitting direction of the connector. To be done.
That is, when the second segment main body is pushed into the existing segment side, the connecting tool moves to the existing segment main body side, and the protruding amount of the connecting tool from the abutting portion increases. As a result, the second segment body can be further moved toward the existing segment body, and the first segment body and the second segment body are reliably connected with an intended fastening force. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention are described below with reference to the drawings.
[0011]
(Overview)
FIG. 1 shows an outline of a connecting structure of tunnel segments according to the present invention. Here, for example, the first segment main body S1 and the second segment main body S2 having the butting portions 1 that are both inclined with respect to the longitudinal direction X of the tunnel are fastened using the connector R shown in the section of the related art. An example is shown. For example, the second segment body S2 in the present embodiment may be a so-called key segment having a substantially trapezoidal planar shape. In addition, these segment main bodies can comprise a concrete segment, a steel segment, etc. in various segments other than a ductile segment, for example.
As shown in FIG. 1, the butt portion 1 of the first segment body S1 is formed with first dovetail grooves M1 at both ends along the longitudinal direction X of the tunnel. These first dovetail grooves M1 are respectively formed with first sandwiched portions m1 that contact the connector R and attract the first segment body S1 and the second segment body S2. Similarly, a second dovetail groove portion M2 and a second sandwiched portion m2 are formed at both ends of the butting portion 1 of the second segment body S2 along the longitudinal direction X of the tunnel.
In the present embodiment, as shown in FIG. 2, the angle formed by the longitudinal direction X of the tunnel, that is, the pushing direction X1 of the second segment body S2 and the extending direction of the first sandwiched portion m1, and the pushing direction X1 The angle formed by the extending direction of the second sandwiched portion m2 is configured to be equal. Further, the interval between the first sandwiched portion m1 and the second sandwiched portion m2 is configured to increase toward the back in the insertion direction of the connector R described later.
On the other hand, the abutting portion 1 between the first segment body S1 and the second segment body S2 is inclined with a predetermined angle with respect to the pushing direction X1.
[0012]
(Concatenation operation)
The connecting process of the second segment body S2 in this embodiment is basically the same as that shown in FIG. However, as described above, the butt portion 1 is inclined at a predetermined angle with respect to the pushing direction X1. Therefore, when the second segment body S2 is pushed in, the connector R slides along the first dovetail groove M1 toward the existing segment body S3, and the second ant structure M2 of the second segment body S2 is In order to be able to move smoothly toward the existing segment main body S3, the relative relationship between the butted portion 1 and the first sandwiched portion m1 and the relationship between the butted portion 1 and the second sandwiched portion m2 are described. Relative relationships are important.
[0013]
FIGS. 3A and 3B show a prone state during the pressing operation of the second segment body S2 and a state where the pressing operation is completed. It is assumed that the first segment body S1 has already been attached to the existing segment body S3.
In the present embodiment, an angle formed by the first sandwiched portion m1 formed in the first groove portion M1 and the pushing direction X1 is θ ₁ . Further, an angle formed by the butting portion 1 of the first segment body S1 with the pushing direction X1 is θ ₂ . The connector R has already been inserted into the first dovetail groove M1.
On the other hand, the angle formed by the butting portion 1 of the second segment body S2 and the pushing direction X1 is the same θ ₂ as in the case of the butting portion 1 of the first segment body S1. And the angle which the 2nd to-be-clamped part m2 formed in the 2nd dovetail groove part M2 makes with the said pushing direction X1 is set to (theta) ₃ .
[0014]
In FIG. 3A, the second segment body S2 is pushed to some extent, and the first sandwiching portion r1 and the second sandwiching portion r2 of the connector R sandwich the first sandwiched portion m1 and the second sandwiched portion m2. And the state which 1st segment main body S1 and 2nd segment main body S2 contact | abutted is shown. Further, for ease of explanation, FIG. 3 (a) shows a state in which the protruding member T of the connector R is just in contact with the existing segment body S3, and the edge re and the second segment of the connector R It is assumed that the edge S2e of the main body S2 matches.
In addition, it is assumed that no deformation occurs in each member except the protruding member T, and frictional force does not act on the portions that contact each other.
If the second segment body S2 is further pushed in from the state of FIG. 3A, the second sandwiched portion m2 presses the second sandwiched portion r2 of the connector R. In order for the second segment main body S2 to move further toward the existing segment main body S3, the second segment main body S2 and the connector R are moved together toward the existing segment main body S3. R moves toward the existing segment main body S3, and there is an allowance in the protruding length of the connector R from the abutting portion 1 of the first segment rod main body S1, and the second segment main body S2 becomes the existing segment main body by this allowance. Either of entering and moving to S3 side.
The former case corresponds to the case where the first sandwiched portion m1 and the butting portion 1 are parallel. That is, it is a case where θ ₁ = θ ₂ . In this case, even if the connecting tool R moves toward the existing segment body S3, the amount of protrusion of the connecting tool R from the abutting portion 1 does not change, so the relative between the connecting tool R and the second segment body S2 The position does not change. On the other hand, the latter corresponds to the case shown in FIGS. In this case, the movement of the connector R and the second segment body S2 is as follows.
As shown in FIG. 3B, it is assumed that the coupling tool R is pushed by Δa by pushing the second segment body S2, and the coupling is finished. In this case, the protruding member T is compressed and deformed under a certain load. The connector R moves to the second segment main body S2 side while moving to the existing segment main body S3 side. As a result, the protruding amount of the edge of the connector R with respect to the butting portion 1 is
△ a ・ (tanθ ₁ − tanθ ₂ )
Only increase. That is, by the above movement, the connector R protrudes from the butting portion 1 by tanθ _1, but the butting portion 1 also protrudes by tanθ ₂ , so the difference between them is the increase in the protruding amount of the connector R. Become.
That is, in order to push the second segment body S2 further,
△ a ・ (tanθ ₁ −tanθ ₂ )> 0
The relationship needs to hold. That is, it is necessary that the angle θ ₁ > θ ₂ .
When the relationship between the angle θ ₁ and the angle θ ₂ is θ ₁ <θ ₂ , it is practically impossible to push the connector R and the second segment body S2 further into the existing segment body S3. It becomes. That is, as the connecting tool R is pushed toward the existing segment main body S3, the amount of protrusion of the connecting portion from the abutting portion 1 is reduced, and a gap for further entry of the second segment main body S2 does not occur. In this case, if the connector R moves in the direction opposite to the existing segment body S3, the amount of protrusion of the connector R from the abutting portion 1 increases, but the connector R receives a pushing force from the second segment body S2. Since it is acting, it is impossible for the connector R to retreat in the opposite direction with respect to the existing segment body S3.
[0015]
The amount of displacement of the second segment body S2 from the prone state of FIG. 3 (a) to the state of FIG. 3 (b) is as follows.
When the protrusion amount of the connector R is increased by Δa · (tan θ ₁ −tan θ ₂ ), the protrusion amount of the second segment body S2 with respect to the edge of the connector R is Δb ₁ .
△ b ₁・ (tanθ ₁ + tanθ ₃ ) = △ a ・ (tanθ ₁ − tanθ ₂ )
And
Δb ₁ = Δa · (tanθ ₁ −tanθ ₂ ) / (tanθ ₁ + tanθ ₃ )
It becomes.
Therefore, if the displacement amount of the second segment body S2 is Δb ₂ , the Δb ₂ can be obtained by adding the displacement amount Δa of the connector R and the Δb ₁ .
[0016]
In the above description, the example of the second dovetail groove M2 on the existing segment main body S3 side of the second dovetail groove M2 formed in the second segment main body S2 has been shown, but what is the existing segment main body S3? Even in the case of the second dovetail groove M2 on the opposite side, the pushing process can be explained in the same manner.
As is apparent from FIG. 2, in the second dovetail groove M2 opposite to the existing segment main body S3, the second segment main body S2 and the connector R are pressed by, for example, a tunnel shield pressing device P. This is because this state is the same as that shown in FIG.
[0017]
(effect)
As is clear from the above description, when connecting the second segment body S2 using a so-called tipping method in which the connector R is attached to the first segment body S1 or the like in advance, the butted portion 1 and the first sandwiched portion are sandwiched. It is desirable that the part m1, and the butting part 1 and the second sandwiched part m2 be separated from each other toward the back in the insertion direction of the connector R.
According to the connecting structure of the tunnel segments of the present invention, the first segment main body S1 and the second segment main body S2 can be simply pushed by pushing the second segment main body S2 into the existing segment main body S3. Can be connected with a substantially constant fastening force, and a highly reliable connecting portion can be obtained.
[0018]
[Another embodiment]
<1> In the above embodiment, the protruding member T is provided only on the second clamping part r2, but in addition, it can be provided on the first clamping part r1 side.
In this case, since the rotation of the connector R when the second segment body S2 is pushed in can be surely prevented, a more appropriate connection operation can be performed. In this case, the total load required to compressively deform each projecting member T is set equal to the load necessary to compressively deform the single projecting member T in the above embodiment. It is good to leave.
[0019]
In the claims, reference numerals are used for convenience of comparison with the drawings. However, the present invention is not limited to the configurations of the accompanying drawings.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a connecting structure of tunnel segments according to the present invention. FIG. 2 is an explanatory view showing a connecting structure of tunnel segments according to the invention. FIG. 3 shows a process of connecting second segment bodies. Explanatory drawing [FIG. 4] Explanatory drawing which shows the connection structure of the segment for tunnels in a prior art [FIG. 5] The top view which shows the shape of a coupling tool [FIG.
S1 1st segment body S2 2nd segment body S3 Existing segment body 1 Butting part M1 1st dovetail part M2 2nd dovetail part m1 1st sandwiched part m2 2nd sandwiched part r1 1st sandwiched part r2 2nd sandwiched part R Connector T Protruding member Y Tunnel circumferential direction

Claims

The first segment body (S1) and the second segment body (S2) assembled adjacent to each other in the tunnel circumferential direction (Y) are opposed to each other with the butted portions (1) facing each other. While providing the 1st dovetail part (M1) which forms the to-be-clamped part (m1), and the 2nd dovetail part (M2) which forms the 2nd to-be-clamped part (m2) separately,
The first dovetail groove portion (M1) and the second dovetail groove portion (M2) can be inserted into the first dovetail groove portion (M1) and the second dovetail groove portion (M2) from the end portion in the longitudinal direction of the tunnel (X), respectively, and the distance between them is wider toward the front side in the insertion direction 1 holding part (r1) and 2nd holding part (r2) are provided on both sides, and it can contact the existing segment body (S3) or segment pushing device (P) adjacent to the tunnel longitudinal direction (X). When the second segment body (S2) is pressed against the existing segment body (S3), the protrusion can be deformed when a load of a certain level or more is applied from the existing segment body (S3) or the pushing device (P). By inserting the connector (R) having the member (T) at the rear end in the insertion direction into the first dovetail groove portion (M1) and the second dovetail groove portion (M2),
The first clamping part (r1) abuts on the first clamping part (m1), the second clamping part (r2) abuts on the second clamping part (m2), and the respective abutting parts (1) A structure for connecting tunnel segments that are relatively close to each other, wherein the butted portion (1) between the first segment body (S1) and the second segment body (S2) is in the axial direction of the tunnel Is inclined with respect to
The distance between the first sandwiched portion (m1) and the butting portion (1) and the spacing between the second sandwiched portion (m2) and the butting portion (1) are the same as those of the connector (R). A connecting structure for tunnel segments that is configured wider toward the front side in the insertion direction.