JP3871435B2

JP3871435B2 - Tunnel segment connection

Info

Publication number: JP3871435B2
Application number: JP08614198A
Authority: JP
Inventors: 勝彦向野; 和則辻本; 順一宮武
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 1998-03-31
Filing date: 1998-03-31
Publication date: 2007-01-24
Anticipated expiration: 2018-03-31
Also published as: JPH11280388A

Description

【０００１】
【発明の属する技術分野】
本発明は、既に構築した第１セグメント本体の第１突合せ面に対して第２セグメント本体の第２突合せ面を当接させた状態で、第１セグメント本体と第２セグメント本体とをトンネル周方向に連結してトンネル壁を構築すべく、前記第１突合せ面の近傍に第１連結部を設け、前記第２突合せ面の近傍に第２連結部を設け、前記第１セグメント本体に対して第２セグメント本体をトンネル長手方向に沿って手前側から奥側に押し込むことで、前記第１連結部と前記第２連結部とが係合して互いに引付け合い、前記第１セグメント本体と前記第２セグメント本体とを連結するトンネル用セグメントの連結部に関する。
【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部は、特に、トンネル周方向に隣接するトンネル用セグメント本体どうしを連結するために用いられるものであり、トンネル用セグメント本体の端部に形成した突合せ面どうしを突き合わせて順次連結していく場合に、双方の突合せ面においてトンネルの長手方向に沿った両端部に形成した二箇所のアリ溝部に亘って連結具を挿入し、双方のトンネル用セグメント本体を引付け連結するものである。前記連結具は、例えば一対の拡大縁部を平板状の胴部で連結した略矩形状の部材であり、夫々の拡大縁部を、双方のアリ溝部に挿入して用いる。
ここで、トンネル周方向に隣接する二つのトンネル用セグメント本体のうち、先に構築されるものを第１セグメント本体とし、後から構築されるものを第２セグメント本体とする。また、前記セグメント本体の突合せ面に設けた二箇所のアリ溝部については、第２セグメント本体の押込方向に沿った奥側を奥側アリ溝部とし、手前側を手前側アリ溝部とする。
従来においては、例えば、図６に示すごとく、第１セグメント本体Ｓ１の奥側アリ溝部Ｍ１ａに奥側連結具Ｇａを備えると共に、第２セグメント本体Ｓ２の手前側アリ溝部Ｍ２ｂにも手前側連結具Ｇｂを備え、押込み手段Ｊを用いて第２セグメント本体Ｓ２を押し込む際に、奥側連結具Ｇａに対する第２セグメント本体Ｓ２の奥側アリ溝部Ｍ２ａの押込みと、第１セグメント本体Ｓ１の手前側アリ溝部Ｍ１ｂに対する手前側連結具Ｇｂの押込みとを同時に行うことがあった。
この場合、第２セグメント本体Ｓ２の奥側アリ溝部Ｍ２ａに対する奥側連結具Ｇａの挿入方向と、第１セグメント本体Ｓ１の手前側アリ溝部Ｍ１ｂに対する手前側連結具Ｇｂの挿入方向とが対向しており、何れ連結具もトンネル長手方向Ｙにおけるセグメント本体の端面からセグメント本体の中央側に挿入するものであった。
【０００３】
【発明が解決しようとする課題】
しかし、上記従来の押込み方式によって第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを連結する場合には次のような問題があった。
【０００４】
例えば、第２セグメント本体Ｓ２の手前側アリ溝部Ｍ２ｂに取付けた手前側連結具Ｇｂを確実に押し込むためには、第２セグメント本体Ｓ２に押込み力を作用させる押込み手段Ｊの位置を、前記第２セグメント本体Ｓ２の押込みと、第２セグメント本体Ｓ２の手前側アリ溝部Ｍ２ｂに設けた連結具Ｇｂの押込みとを同時に行える位置に設定する必要があった。仮に、第２セグメント本体Ｓ２のみを押し込んだ場合には、前記連結具Ｇｂが前記手前側アリ溝部Ｍ２ｂの外部に取り残されることになってしまう。
よって、前記押込み手段Ｊが専用の装置でない場合や、例えば押込み手段Ｊを設けた装置がトンネルシールドであって、当該トンネルシールドがトンネル周方向Ｘに回転した場合等には、前記押込み手段Ｊが前記連結具Ｇｂを押し込めない位置に移動することがあり、前記連結具Ｇｂの押込みが不十分なものとなって、連結部の性能が損なわれることがあった。
【０００５】
また、当該連結部を連結具Ｇとアリ溝部Ｍとで構成する場合には、連結具Ｇ及びアリ溝部Ｍに対して所定の加工精度が要求される。例えば、連結具Ｇの双方の拡大縁部２０どうしの間隔が、対向するアリ溝部Ｍどうしの間隔よりも狭い場合には、連結具Ｇを十分に挿入することが困難となるし、逆に、対向するアリ溝部Ｍどうしの間隔よりも広い場合には、第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを十分に引き付けることが困難となる。このため、第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とを所定の引付け力を発生させた状態で連結すべく連結具Ｇ等の精度を高めようとすると、それら連結具Ｇ等の製作が非常に手間の掛かるものとなっていた。
【０００６】
さらに、上記従来技術の場合には、前記アリ溝部Ｍを第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との双方に形成しておく必要があったから、その分だけ第１・第２セグメント本体Ｓ１，Ｓ２の重量が増加し、材料コストあるいは運搬コストが増加するという不都合も生じていた。
【０００７】
本発明の目的は、このような従来技術の欠点を解消し、連結部の加工およびセグメント本体の連結作業が容易で、所定の締結力を発生させることのできるトンネル用セグメントの連結部を提供することにある。
【０００８】
【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トンネル用セグメントの連結部は、請求項１に記載したごとく、共に第２セグメント本体Ｓ２の押込み方向に対してトンネル周方向Ｘに傾斜しており、互いに係合自在な係合面と被係合面とを、第２連結部と第１連結部に振り分けて形成し、前記第２セグメント本体Ｓ２を押込んで前記係合面と前記被係合面とが引き付け合う際に、前記係合面および前記被係合面の少なくとも一方が前記トンネル周方向に沿って移動可能となるよう、同方向に沿った外力を受けて変形自在である変形手段を備えた点に特徴を有する。
（作用・効果）
本構成のごとく、係合面、および、被係合面、変形手段を備えておけば、第２セグメント本体の押し込みに際して、例えば、第２突合せ面と係合面との間隔を調節することができるから、第１セグメント本体あるいは第２セグメント本体等に製作誤差が存在しても前記変形手段によって、これら製作誤差の影響をなくすことができ、所定の引付け力を確実に発生させることができる。
【０００９】
（構成２）
本発明のトンネル用セグメントの連結部は、請求項２に記載したごとく、前記第２セグメント本体に、前記トンネル周方向に延出するボルト部材を設けると共に、当該ボルト部材に支持させた係合片に前記係合面を設け、前記変形手段を前記ボルト部材に設けて構成することができる。
（作用・効果）
このように、トンネル周方向に延出するボルト部材を第２セグメント本体に設け、このボルト部材に変形手段を設けておくことで、第２連結部を極めて容易に製作することができ、第２セグメント本体に従来のごとくアリ溝部を形成する必要がなくなるため、第２セグメント本体の軽量化が行える。
また、第２セグメント本体を押し込めば、前記係合片も押し込まれるから、第２セグメント本体を押し込む際の押し込み位置が特に限定されず、押し込み操作が簡便なものとなる。
さらに、第１連結部及び第２連結部の製作誤差に拘わらず、第２セグメント本体の押込みに際して前記変形部材の変形によって第１セグメント本体と第２セグメント本体との間には略一定の引付け力を発生させることができるため、セグメント本体どうしの連結を確実に行うことができる。
【００１０】
（構成３）
本発明のトンネル用セグメントの連結部は、請求項３に記載したごとく、前記変形手段を前記トンネル周方向に沿った外力を受けて塑性変形する筒部材で構成することができる。
（作用・効果）
本構成のごとく塑性変形する筒部材を備えておけば、第１連結部及び第２連結部の製作誤差に拘わらず、第２セグメント本体の押込みに際して前記筒部材の変形によって第１セグメント本体と第２セグメント本体との間には略一定の引付け力を発生させることができるため、セグメント本体どうしの連結を確実に行うことができる。
【００１１】
（構成４）
本発明のトンネル用セグメントの連結部は、請求項４に記載したごとく、前記変形手段を、前記トンネル周方向に沿った外力を受けて弾性圧縮変形あるいは弾性引張り変形するバネ部材で構成することができる。
（作用・効果）
このようにバネ部材を設けておけば、連結部の引付け力を確実に確保できて十分な強度を有する連結部を得ることができる。
つまり、圧縮変形を受けるバネ部材にあっては、圧縮に必要な荷重とバネ部材の変形量との間には略比例関係が成立する。よって、第２セグメント本体を押し込む前に、予め前記第１ナット部材或いは前記第２ナット部材を調節して第１突合せ面と係合面との間隔を調節しておくことで、第２セグメントの押込みが終了した状態における前記バネ部材の変形量を設定することができる。当該変形によって生ずる引付け力を、第１セグメント本体と第２セグメント本体との間に発生させるべき引付け力以上に設定しておくことで、十分な強度を有する連結部を得ることができる。
また、必要以上の引付け力を発生させておくことで、仮に、連結が終了したのちに第１セグメント本体と第２セグメント本体との間の引付け力が低下する事態が生じても、前記バネ部材の復元力によって前記引付け力の低下を補うことが可能となる。
【００１２】
（構成５）
本発明のトンネル用セグメントの連結部は、請求項５に記載したごとく、前記第１連結部に、前記トンネルの径方向に隣接する一対の前記被係合面を設け、前記第２連結部に、前記トンネルの径方向に隣接する一対の前記係合面を設けて構成することができる。
（作用・効果）
本構成のごとく、被係合面と係合面とを夫々二箇所ずつに設けておけば、第１セグメント本体と第２セグメント本体との間に作用する曲げ力に有効に対抗することができ、連結部を強固に形成することができる。
【００１３】
【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。
（概要）
本発明のトンネル用セグメントの連結部の概要を図１に示す。
本実施形態では、既に構築が終了した第１セグメント本体Ｓ１に対し、第２セグメント本体Ｓ２をトンネル周方向Ｘに隣接させて連結する例を示す。
本実施形態においては、第１セグメント本体Ｓ１および第２セグメント本体Ｓ２がダクタイルセグメントである例を示す。ただし、本発明に係る連結部は、この他に、例えばダクタイルセグメントあるいはコンクリートセグメントに対しても適用可能である。
【００１４】
前記第１セグメント本体Ｓ１および前記第２セグメント本体Ｓ２は、第１セグメント本体Ｓ１の第１突合せ面Ｆ１と第２セグメント本体Ｓ２の第２突合せ面Ｆ２どうしを当接した状態で連結される。このうち、第１突合せ面Ｆ１の近傍には第１連結部Ｒ１を設け、第２突合せ面Ｆ２の近傍には第２連結部Ｒ２を設けてある。
第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とは、前記第１突合せ面Ｆ１に前記第２突合せ面Ｆ２を近接させ、かつ、前記第２セグメント本体Ｓ２をトンネルの長手方向Ｙに沿って奥側に押し込むことで連結させることができる。この場合、前記第１連結部Ｒ１と前記第２連結部Ｒ２とが係合して互いに引き付け合うことで、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との連結が行われる。
【００１５】
（第１連結部）
前記第１突合せ面Ｆ１のうち、トンネル長手方向Ｙに沿った両端部近傍には夫々第１連結部Ｒ１を設けてある。当該第１連結部Ｒ１は、図１に示すごとく、トンネル長手方向Ｙに沿って前記第１突合せ面Ｆ１に形成したスリット１と、当該スリット１の両側に形成した被係合面２とで構成してある。当該スリット１は、第１セグメント本体Ｓ１の端面のうち前記トンネルの長手方向Ｙに沿って両端部にある端面に通じている。
尚、この場合の前記被係合面２は前記第１突合せ面Ｆ１の裏側に位置する。また、当該被係合面２は、前記第２セグメント本体Ｓ２の押込み方向ｙに対して前記トンネル周方向Ｘに傾斜している。つまり、第１突合せ面Ｆ１と被係合面２との間の厚みが、前記押込み方向ｙの奥側ほど厚く構成してある。
【００１６】
本実施形態に係るセグメント本体はダクタイルセグメントであるから、このようなスリット１や傾斜した被係合面２は鋳造時に簡単に形成することができる。よって、第１連結部Ｒ１の加工を極めて簡単に行うことができ、従来のアリ溝部を形成していた場合と比べて、セグメント本体の重量も低減させることができる。
【００１７】
（第２連結部）
図１および図２に示すごとく、前記第２連結部Ｒ２は、前記第２突合せ面Ｆ２からボルト部材３を突出させて設けておき、当該ボルト部材３に係合片４を取り付けて構成してある。当該係合片４には、前記被係合面２と係合可能な係合面５を設けてある。前記ボルト部材３は、具体的には、前記第２突合せ面Ｆ２を形成する第２セグメント本体Ｓ２の端部Ｓ２ａを貫通して取り付けてある。当該端部Ｓ２ａに形成した貫通孔６は、単なる孔部であり、雌ねじ部等は形成していない。よって、当該貫通孔６に挿通したボルト部材３は前記貫通孔６に対して出退自在である。ただし、この場合には、前記貫通孔６の内径は、前記ボルト部材３の外径と略同様に形成しておく。仮に、ボルト部材３の外径に対して前記貫通孔６の内径が大き過ぎる場合には、前記第２セグメント本体Ｓ２を押し込む際に、前記ボルト部材３及び前記係合片４が押込み方向ｙの後方に倒れて、適切な押し込み操作が行えなくなるからである。
【００１８】
前記ボルト部材３の両端部のうち前記第１突合せ面Ｆ１の裏側に位置する端部には、図１に示すごとく変形手段Ｈを外挿させてある。この場合の変形手段Ｈは、例えば略筒状形状を有する筒部材Ｈ１であって、前記ボルト部材３は、当該筒部材Ｈ１に対して前記トンネル周方向Ｘに沿って移動可能である。前記ボルト部材３は、例えば頭部を有しないものを使用すると第２セグメント本体への取付けが容易である。この場合には、第２セグメント本体Ｓ２の外側から第２セグメント本体Ｓ２の内側に向けてボルト部材３を挿通し、さらに前記筒部材Ｈ１に挿通させたのち、ボルト部材３の端部に第１ナット部材７を螺合させておくのである。本構成であれば、第２セグメント本体Ｓ２の内側に不必要に大きなボルトポケットを形成しなくても済む。前記筒部材Ｈ１はトンネル周方向Ｘに沿った外力を受けて変形自在であるが、その変形態様については後述する。
【００１９】
前記ボルト部材３のもう一方の端部は、前記係合片４に貫通させてあり、突出した当該端部には第２ナット部材８を螺合させてある。つまり、前記第１ナット部材７と当該第２ナット部材８とを操作することで、前記第２セグメント本体Ｓ２の押込みに先立って前記第１突合せ面Ｆ１と前記係合面５との間隔を調節することができる。
本構成であれば、セグメント本体を鋳造する際に前記貫通孔６を併せて形成することができ、ボルト部材３は、量産品を使用することができるため、第２連結部Ｒ２を極めて簡単に構成することができる。尚、本実施形態では、ボルト部材３として両切ボルトを用いる例を示したが、通常のボルト頭部を有するものを使用しても何ら差し支えない。
【００２０】
本実施形態では、一つの係合片４を二本のボルト部材３で支持する。夫々のボルト部材３に係る第１ナット部材７及び第２ナット部材８の位置調節は、前記被係合面２と第１突合せ面Ｆ１との厚みに応じて適宜設定する。例えば、係合面５と第２突合せ面Ｆ２との間隔を前記被係合面２と第１突合せ面Ｆ１との間隔よりも僅かに狭く設定しておくことで、第２セグメント本体Ｓ２を押し込んだ際に所定の引付け力が発生させることができる。
【００２１】
このように、本構成の第２連結部Ｒ２は極めて簡単なものであり、その加工も容易である。そして、第２セグメント本体Ｓ２の押し込みに先立って係合面５と第２突合せ面Ｆ２との距離を調節することができるから、第１セグメント本体Ｓ１あるいは第２セグメント本体Ｓ２、係合片４等に製作誤差が存在しても前記第１ナット部材７等によって、これら製作誤差の影響をなくすことができ、所定の引付け力を発生させることができる。
また、本構成であれば、第１セグメント本体Ｓ１の場合と同様に第２セグメント本体Ｓ２にアリ溝部を形成する必要がなくなるから第２セグメント本体Ｓ２の重量を軽減することができる。
【００２２】
前記係合片４は、図１に示すごとく、前記係合片４の手前側端部が第２セグメント本体Ｓ２の端部よりも押込み方向ｙの奥側に引退するように第２セグメント本体Ｓ２に取り付けてある。よって、第２セグメント本体Ｓ２を例えばトンネルシールドに設けた押込み手段Ｊによって押し込む場合に、当該押込み手段Ｊによって押圧されるのは、第２セグメント本体Ｓ２の端面のうちトンネル掘削方向前方に面した端面のみとなって、係合片４の位置を特に考慮する必要がなくなる。この結果、前記押込み手段Ｊの位置が制限されることがなくなって、従来の連結部を設けていた場合よりも押込み作業を簡単にすることができる。
【００２３】
（連結操作）
既に構築が完了した第１セグメント本体Ｓ１に対して前記第２セグメント本体Ｓ２を押し込む際には、前記被係合面２に前記係合面５が当接するように第２セグメント本体Ｓ２を第１セグメント本体Ｓ１に近接させる。このとき、前記ボルト部材３が第１連結部Ｒ１のスリット１に挿入するように位置決めする。つまり、第２セグメント本体Ｓ２を押し込む際には、ボルト部材３がスリット１に挿入されたあとは当該スリット１が案内部となって第２セグメント本体Ｓ２の押込みを円滑に行うことができる。
尚、前記係合面５と第２突合せ面Ｆ２との間隔は、前記筒部材Ｈ１に所定の変形を生じさせることができるように前記第１突合せ面Ｆ１と前記被係合面２との距離よりも小さくなるように設定しておく。
【００２４】
図２は当該筒部材Ｈ１の動作態様を示す。第２セグメント本体Ｓ２の押し込みにより、係合面５と被係合面２とが当接した状態が図２（イ）である。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、前記筒部材Ｈ１に圧縮力が作用し、前記筒部材Ｈ１の弾性圧縮変形量を増しながら係合片が押し込まれる。この段階においては、当該圧縮力は筒部材Ｈ１の弾性限内にあるため、筒部材Ｈ１は単に弾性変形するだけであり、目立った変形は生じない。
しかし、さらに第２セグメント本体Ｓ２を押し込むと、前記圧縮力が筒部材Ｈ１の弾性限界を越えて大きくなり、前記筒部材Ｈ１には塑性変形である屈曲変形が生じるようになる。この後、第２セグメント本体Ｓ２の押込みに伴って当該屈曲変形量は増大し続け、図２（ロ）に示す状態となって第２セグメント本体Ｓ２の押込みが終了する。
【００２５】
本発明の連結部では、前記筒部材Ｈ１を設けてある結果、第２セグメント本体Ｓ２の押込みに際して、前記被係合面２と前記係合面５との間には一定の引付け力を発生させることができる。
図３には、前記筒部材Ｈ１の圧縮変形特性を示す。
当該筒部材Ｈ１をその軸芯方向に沿って圧縮すると、原点０からａ点までの初期の段階においては、筒部材Ｈ１は弾性的に圧縮変形する。圧縮荷重Ｐがａ点に達した段階で、当該筒部材Ｈ１には塑性変形を伴った面外変形が生じ始める。その後は、ａ点からｂ点に示すごとくしばらく押圧を続けても前記筒部材Ｈ１に加わる荷重Ｐは増加せず面外変形のみが進行する。ｂ点に達すると前記面外変形は座屈に転じ、前記筒部材Ｈ１に加わる荷重Ｐはｃ点までやや急激に低下する。ｃ点で前記筒部材Ｈ１の変形は略終了し、この後、押圧を続けても圧縮変形は生じず荷重Ｐのみが増加する。
本実施形態においては、筒部材Ｈ１が有する変形特性のうち、ａ点からｂ点までの特性を利用する。つまり、この範囲であれば、前記第２セグメント本体Ｓ２を押し込む際に筒部材Ｈ１には一定の荷重が生じることとなり、即ち、係合面５と被係合面２との間に生じる引付け力も一定に維持されることになるからである。
【００２６】
このように、前記筒部材Ｈ１を用いる場合には、例えば、前記第２突合せ面Ｆ２と係合面５との間隔の誤差が、図３のａ点からｂ点までのストロークの範囲内であれば第１セグメント本体Ｓ１と第２セグメント本体Ｓ２とは、所定の引付け力で連結することができることとなる。本構成によれば、第１連結部Ｒ１或いは第２連結部Ｒ２の加工誤差を広い範囲で吸収できるため、第１連結部Ｒ１等の製作の手間を大幅に削減することができる。
【００２７】
尚、前記筒部材Ｈ１は、アルミニウム・銅・鉛、あるいは薄肉の鋼材など比較的変形し易い材料を用いて形成することができる。つまり、これらの材料であれば塑性変形能力が安定しているから、所望の変形性状を有する筒部材Ｈ１を容易に得ることができる。
【００２８】
（作用効果）
以上のごとく、本構成のトンネル用セグメントの連結部であれば、第１連結部Ｒ１および第２連結部Ｒ２を極めて容易に製作することができ、第１セグメント本体Ｓ１および第２セグメント本体Ｓ２に従来のごとくアリ溝部を形成する必要がなくなるため、第１セグメント本体Ｓ１および第２セグメント本体Ｓ２の軽量化が行える。
また、第２セグメント本体Ｓ２を押し込めば、前記係合片４も押し込まれるから、第２セグメント本体Ｓ２を押し込む際の押し込み位置が特に限定されず、押し込み操作が簡便なものとなる。
さらに、第１連結部Ｒ１及び第２連結部Ｒ２の製作誤差に拘わらず、第２セグメント本体Ｓ２の押込みに先立って係合面５の位置を調節することができるため、第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との間に所期の引付け力を発生させることができる。しかも、第２セグメント本体Ｓ２の押込みに際しては、前記筒部材Ｈ１の変形によって第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との間には略一定の引付け力を発生させることができるため、セグメント本体どうしの連結をより確実に行うことができる。
【００２９】
〔別実施形態〕
〈１〉前記第２連結部Ｒ２の構成は、上記構成に限られるものではなく、例えは、前記係合片４と前記第２ナット部材８との間に前記筒部材Ｈ１を挿入するものであってもよい。
要するに、第２セグメント本体Ｓ２の押込みに際して筒部材Ｈ１が塑性変形するものであり、それによって前記第２突合せ面Ｆ２と係合面５との間隔が離間するものであれば何れの構成であってもよい。
【００３０】
例えば、ボルト部材３の端部を前記第２セグメント本体Ｓ２の端部Ｓ２ａに螺合させておき、ボルト部材３のもう一方の端部を係合片４に貫通させたのち当該端部に筒部材Ｈ１を取り付ける構成であれば、ボルト部材３の一方の端部が第２セグメント本体Ｓ２の端部Ｓ２ａと一体化する。よって、第２セグメント本体Ｓ２の押し込みに際してボルト部材３が倒れることがなく、係合片４の姿勢が安定するから、係合面５と被係合面２との係合を円滑に行うことができる。
【００３１】
〈２〉
上記実施形態では、筒部材Ｈ１として前記トンネル周方向Ｘに沿った外力を受けて塑性変形するものを使用したが、当該構成に限られるものではなく、図４に示すごとく、前記トンネル周方向Ｘに沿った外力を受けて弾性圧縮変形あるいは弾性引張り変形するバネ部材９を用いるものであってもよい。
ここでは、上記別実施形態〈１〉と同様に、ボルト部材３の端部を前記第２セグメント本体Ｓ２の端部Ｓ２ａに螺合させておき、ボルト部材３のもう一方の端部を係合片４に貫通させたのち当該端部にバネ部材９を取り付けて構成することができる。
前記バネ部材としては、例えば、スプリングワッシャや、コイルバネ等を用いることができる。
【００３２】
本別実施形態の場合には、バネ部材９は圧縮変形を受けることとなるが、その際に必要な荷重とバネ部材９の変形量との間には略比例関係が成立する。よって、第２セグメント本体Ｓ２を押し込む前に、予め前記第１ナット部材７或いは前記第２ナット部材８を調節して第１突合せ面Ｆ１と係合面５との間隔を調節しておくことで、第２セグメントＳ２の押込みが終了した状態における前記バネ部材９の変形量を設定することができる。当該変形によって生ずる引付け力を、第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との間に発生させるべき引付け力以上に設定しておくことで、十分な強度を有する連結部を得ることができる。
また、必要以上の引付け力を発生させておくことで、仮に、連結が終了したのちに第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との間の引付け力が低下する事態が生じても、前記バネ部材９の復元力によって前記引付け力の低下を補うことが可能となる。
このように、本別実施形態による場合には、第１連結部Ｒ１および第２連結部Ｒ２の加工を容易なものとしながら、第１セグメント本体Ｓ１および第２セグメント本体Ｓ２にアリ溝部などを形成することを不要にしてこれらセグメント本体の重量を軽減することができる。そして、係合片４が第２セグメント本体Ｓ２と略一体化されているから、第２セグメント本体Ｓ２を押し込む際に押込み手段Ｊの位置等が制限されず、押込み作業が容易なものとなる。しかも、連結部の引付け力を確実に確保できて十分な強度を有する連結部を得ることができる。
【００３３】
〈３〉
上記実施形態においては、第１連結部Ｒ１および第２連結部Ｒ２の何れにおいても、係合面５と被係合面２とをトンネル径方向Ｚにおいて一箇所ずつ設けたが、図５に示すごとく、同方向において係合面５と被係合面２とを夫々二箇所に設けてもよい。
本構成であれば、第１セグメント本体Ｓ１と第２セグメント本体Ｓ２との間に作用する曲げ力に有効に対抗することができ、強固な連結部を得ることができる。
【００３４】
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】本発明に係るトンネル用セグメントの連結部の概要を示す斜視図
【図２】連結部の連結態様を示す説明図
【図３】筒部材Ｈ１の圧縮変形特性を示す説明図
【図４】別実施形態に係る連結部の連結態様を示す説明図
【図５】別実施形態に係るトンネル用セグメントの連結部の概要を示す斜視図
【図６】従来技術に係るトンネル用セグメントの連結部の概要を示す斜視図
【符号の説明】
２被係合面
３ボルト部材
４係合片
５係合面
９バネ部材
Ｆ１第１突合せ面
Ｆ２第２突合せ面
Ｈ変形手段
Ｒ１第１連結部
Ｒ２第２連結部
Ｓ１第１セグメント本体
Ｓ２第２セグメント本体
Ｘトンネル周方向
Ｙトンネル長手方向
ｙ押込み方向[0001]
BACKGROUND OF THE INVENTION
In the present invention, the first segment main body and the second segment main body are connected in the tunnel circumferential direction in a state where the second butted surface of the second segment main body is brought into contact with the first butted surface of the first segment main body that has already been constructed. In order to construct a tunnel wall by connecting to the first segment surface, a first connection portion is provided in the vicinity of the first abutting surface, a second connection portion is provided in the vicinity of the second abutting surface, By pushing the two-segment body from the near side to the far side along the longitudinal direction of the tunnel, the first connecting portion and the second connecting portion are engaged and attracted to each other. The present invention relates to a connecting portion of a tunnel segment that connects two segment bodies.
[0002]
[Prior art]
Conventionally, this type of tunnel segment connecting portion is used to connect tunnel segment bodies adjacent to each other in the circumferential direction of the tunnel. Are inserted in the two dovetail grooves formed at both ends along the longitudinal direction of the tunnel on both abutting surfaces, and both tunnel segment bodies are pulled. It is to be connected. The connector is, for example, a substantially rectangular member in which a pair of enlarged edges are connected by a plate-shaped body, and each enlarged edge is inserted into both dovetail portions.
Here, of the two tunnel segment bodies adjacent in the circumferential direction of the tunnel, the one constructed first is the first segment body, and the one constructed later is the second segment body. Moreover, about the two dovetail part provided in the butting | matching surface of the said segment main body, let the back side along the pushing direction of a 2nd segment main body be a back side dovetail groove part, and let this side be a front side dovetail groove part.
Conventionally, for example, as shown in FIG. 6, the back side dovetail part M1a of the first segment body S1 is provided with the back side dovetail tool Ga, and the front side dovetail part M2b of the second segment body S2 is also provided in the near side joint tool. Gb, and when the second segment body S2 is pushed using the pushing means J, the back-side dovetail groove M2a of the second segment body S2 is pushed into the back-side connector Ga, and the front-side dovetail of the first segment body S1. In some cases, the near side connector Gb is pushed into the groove M1b at the same time.
In this case, the insertion direction of the back side connector Ga with respect to the back side dovetail groove portion M2a of the second segment body S2 and the insertion direction of the front side connector Gb with respect to the front side dovetail groove portion M1b of the first segment body S1 are opposed to each other. In any case, the coupler is inserted from the end face of the segment body in the tunnel longitudinal direction Y to the center side of the segment body.
[0003]
[Problems to be solved by the invention]
However, when the first segment body S1 and the second segment body S2 are connected by the conventional pushing method, there are the following problems.
[0004]
For example, in order to surely push in the near side connector Gb attached to the near side dovetail groove M2b of the second segment body S2, the position of the pushing means J for applying a pushing force to the second segment body S2 is set to the second segment body S2. It was necessary to set the position where the pushing of the segment body S2 and the pushing of the connecting tool Gb provided in the front dovetail groove M2b of the second segment body S2 can be performed simultaneously. If only the second segment body S2 is pushed in, the connector Gb will be left outside the front dovetail groove M2b.
Therefore, when the pushing means J is not a dedicated apparatus, or when the apparatus provided with the pushing means J is a tunnel shield and the tunnel shield rotates in the tunnel circumferential direction X, the pushing means J is The connection tool Gb may move to a position where the connection tool Gb cannot be pushed in, and the push-in of the connection tool Gb becomes insufficient, and the performance of the connection part may be impaired.
[0005]
Moreover, when the said connection part is comprised with the connection tool G and the dovetail groove part M, predetermined | prescribed process precision is requested | required with respect to the connection tool G and the dovetail groove part M. FIG. For example, when the interval between the two enlarged edge portions 20 of the connector G is narrower than the interval between the opposing dovetail grooves M, it is difficult to sufficiently insert the connector G. If the distance is greater than the distance between the opposing dovetail grooves M, it is difficult to sufficiently attract the first segment body S1 and the second segment body S2. For this reason, if it is going to improve the precision of the connection tool G etc. in order to connect 1st segment main body S1 and 2nd segment main body S2 in the state which generate | occur | produced the predetermined attractive force, manufacture of these connection tools G etc. will be carried out. It was very time consuming.
[0006]
Furthermore, in the case of the above prior art, the dovetail groove M has to be formed in both the first segment main body S1 and the second segment main body S2, and accordingly, the first and second segment main bodies S1 correspondingly. , S2 increases in weight, resulting in an increase in material cost or transportation cost.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a connecting portion for a tunnel segment that eliminates the disadvantages of the prior art and can easily process the connecting portion and connect the segment body and generate a predetermined fastening force. There is.
[0008]
[Means for Solving the Problems]
(Configuration 1)
In order to achieve this object, the connecting portions of the tunnel segments according to the present invention are both inclined in the tunnel circumferential direction X with respect to the pushing direction of the second segment body S2, as described in claim 1, and An engageable engagement surface and an engaged surface are formed by being divided into a second connecting portion and a first connecting portion, and the second segment body S2 is pushed in so that the engaging surface and the engaged surface are And a deforming means that can be deformed by receiving an external force in the same direction so that at least one of the engaging surface and the engaged surface can move along the tunnel circumferential direction. It has the characteristics in the point.
(Action / Effect)
If the engaging surface, the engaged surface, and the deforming means are provided as in this configuration, for example, the distance between the second butting surface and the engaging surface can be adjusted when the second segment body is pushed. Therefore, even if manufacturing errors exist in the first segment body or the second segment body, the deformation means can eliminate the influence of these manufacturing errors, and a predetermined attractive force can be reliably generated. .
[0009]
(Configuration 2)
As described in claim 2, the connecting portion of the tunnel segment according to the present invention is provided with a bolt member extending in the circumferential direction of the tunnel on the second segment body, and an engagement piece supported by the bolt member. The engagement surface may be provided, and the deformation means may be provided on the bolt member.
(Action / Effect)
Thus, by providing a bolt member extending in the circumferential direction of the tunnel in the second segment main body and providing a deformation means for this bolt member, the second connecting portion can be manufactured very easily. Since it is not necessary to form a dovetail portion in the segment body as in the prior art, the weight of the second segment body can be reduced.
Further, if the second segment main body is pushed in, the engaging piece is also pushed in, so that the push-in position when pushing in the second segment main body is not particularly limited, and the push-in operation becomes simple.
Further, regardless of the manufacturing errors of the first connecting portion and the second connecting portion, a substantially constant attraction between the first segment main body and the second segment main body due to the deformation of the deformation member when the second segment main body is pushed in. Since force can be generated, the segment bodies can be reliably connected to each other.
[0010]
(Configuration 3)
As described in claim 3, the connecting portion of the tunnel segment according to the present invention can be configured such that the deforming means is a cylindrical member that is plastically deformed by receiving an external force along the circumferential direction of the tunnel.
(Action / Effect)
If a cylindrical member that is plastically deformed as in this configuration is provided, the first segment main body and the first segment main body are deformed by the deformation of the cylindrical member when the second segment main body is pushed, regardless of manufacturing errors of the first connecting portion and the second connecting portion. Since a substantially constant attractive force can be generated between the two segment main bodies, the segment main bodies can be reliably connected to each other.
[0011]
(Configuration 4)
As described in claim 4, the connecting portion of the tunnel segment according to the present invention may be configured such that the deforming means is a spring member that is elastically deformed or elastically deformed by receiving an external force along the circumferential direction of the tunnel. it can.
(Action / Effect)
By providing the spring member in this way, it is possible to reliably secure the attractive force of the connecting portion and obtain a connecting portion having sufficient strength.
That is, in a spring member that undergoes compression deformation, a substantially proportional relationship is established between the load required for compression and the amount of deformation of the spring member. Therefore, by adjusting the first nut member or the second nut member in advance and adjusting the distance between the first butting surface and the engaging surface before pushing the second segment body, It is possible to set the amount of deformation of the spring member in the state where the pushing is completed. By setting the attracting force generated by the deformation to be equal to or greater than the attracting force to be generated between the first segment body and the second segment body, a connecting portion having sufficient strength can be obtained.
Moreover, even if a situation occurs in which the attractive force between the first segment main body and the second segment main body is reduced after the connection is completed by generating an attractive force more than necessary, It is possible to compensate for the decrease in the attractive force by the restoring force of the spring member.
[0012]
(Configuration 5)
As described in claim 5, the connecting portion of the tunnel segment according to the present invention includes a pair of engaged surfaces adjacent to the first connecting portion in a radial direction of the tunnel, and the second connecting portion. A pair of engaging surfaces adjacent to each other in the radial direction of the tunnel can be provided.
(Action / Effect)
As in this configuration, if the engaged surface and the engaging surface are provided at two locations, respectively, it is possible to effectively counter the bending force acting between the first segment body and the second segment body. The connecting portion can be formed firmly.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention are described below with reference to the drawings.
(Overview)
The outline of the connecting portion of the tunnel segment of the present invention is shown in FIG.
In the present embodiment, an example is shown in which the second segment body S2 is adjacently connected in the tunnel circumferential direction X to the first segment body S1 that has already been constructed.
In the present embodiment, an example in which the first segment body S1 and the second segment body S2 are ductile segments is shown. However, the connecting portion according to the present invention is also applicable to, for example, a ductile segment or a concrete segment.
[0014]
The first segment body S1 and the second segment body S2 are connected in a state where the first butting surface F1 of the first segment body S1 and the second butting surface F2 of the second segment body S2 are in contact with each other. Among these, the 1st connection part R1 is provided in the vicinity of the 1st abutting surface F1, and the 2nd connection part R2 is provided in the vicinity of the 2nd abutting surface F2.
The first segment main body S1 and the second segment main body S2 have the second abutting surface F2 close to the first abutting surface F1, and the second segment main body S2 is located on the back side along the longitudinal direction Y of the tunnel. It can be connected by pushing into. In this case, the first segment body S1 and the second segment body S2 are connected by the first connection portion R1 and the second connection portion R2 engaging and attracting each other.
[0015]
(First connection part)
A first connecting portion R1 is provided in the vicinity of both end portions along the tunnel longitudinal direction Y in the first abutting surface F1. As shown in FIG. 1, the first connecting portion R <b> 1 includes a slit 1 formed in the first butting surface F <b> 1 along the tunnel longitudinal direction Y, and engaged surfaces 2 formed on both sides of the slit 1. It is. The slit 1 communicates with the end surfaces at both ends along the longitudinal direction Y of the tunnel among the end surfaces of the first segment body S1.
In this case, the engaged surface 2 is located on the back side of the first abutting surface F1. The engaged surface 2 is inclined in the tunnel circumferential direction X with respect to the pushing direction y of the second segment body S2. That is, the thickness between the first butted surface F1 and the engaged surface 2 is configured to be thicker toward the back side in the pressing direction y.
[0016]
Since the segment body according to the present embodiment is a ductile segment, the slit 1 and the inclined engaged surface 2 can be easily formed during casting. Therefore, the processing of the first connecting portion R1 can be performed very easily, and the weight of the segment body can be reduced as compared with the case where the conventional dovetail portion is formed.
[0017]
(Second connection part)
As shown in FIG. 1 and FIG. 2, the second connecting portion R <b> 2 is configured by projecting a bolt member 3 from the second abutting surface F <b> 2 and attaching an engagement piece 4 to the bolt member 3. is there. The engagement piece 4 is provided with an engagement surface 5 that can be engaged with the engaged surface 2. Specifically, the bolt member 3 is attached through the end S2a of the second segment body S2 that forms the second abutting surface F2. The through hole 6 formed in the end portion S2a is a simple hole portion, and no female screw portion or the like is formed. Therefore, the bolt member 3 inserted through the through hole 6 can be moved back and forth with respect to the through hole 6. However, in this case, the inner diameter of the through hole 6 is formed in substantially the same manner as the outer diameter of the bolt member 3. If the inner diameter of the through hole 6 is too large with respect to the outer diameter of the bolt member 3, when the second segment body S2 is pushed in, the bolt member 3 and the engagement piece 4 are in the pushing direction y. It is because it falls back and cannot perform proper pushing operation.
[0018]
As shown in FIG. 1, a deforming means H is extrapolated to the end portion of the both ends of the bolt member 3 that is located on the back side of the first butting surface F1. The deformation means H in this case is, for example, a cylindrical member H1 having a substantially cylindrical shape, and the bolt member 3 is movable along the tunnel circumferential direction X with respect to the cylindrical member H1. For example, when the bolt member 3 having no head is used, it is easy to attach to the second segment body. In this case, the bolt member 3 is inserted from the outer side of the second segment main body S2 toward the inner side of the second segment main body S2, and further inserted through the cylindrical member H1. The nut member 7 is screwed together. With this configuration, it is not necessary to form an unnecessarily large bolt pocket inside the second segment body S2. The cylindrical member H1 can be deformed by receiving an external force along the tunnel circumferential direction X, and the deformation mode will be described later.
[0019]
The other end of the bolt member 3 is penetrated through the engagement piece 4, and a second nut member 8 is screwed into the protruding end. That is, by operating the first nut member 7 and the second nut member 8, the distance between the first butting surface F1 and the engagement surface 5 is adjusted prior to the pressing of the second segment body S2. can do.
If it is this structure, when casting a segment main body, since the said through-hole 6 can be formed collectively and the bolt member 3 can use a mass-production product, 2nd connection part R2 can be used very simply. Can be configured. In the present embodiment, an example in which a double-sided bolt is used as the bolt member 3 has been described. However, a member having a normal bolt head may be used.
[0020]
In the present embodiment, one engagement piece 4 is supported by two bolt members 3. Position adjustment of the 1st nut member 7 and the 2nd nut member 8 which concern on each bolt member 3 is suitably set according to the thickness of the said to-be-engaged surface 2 and the 1st abutting surface F1. For example, the second segment main body S2 is pushed in by setting the distance between the engagement surface 5 and the second abutting surface F2 slightly smaller than the distance between the engaged surface 2 and the first abutting surface F1. In this case, a predetermined attractive force can be generated.
[0021]
Thus, the second connecting portion R2 of this configuration is extremely simple and easy to process. Since the distance between the engagement surface 5 and the second abutting surface F2 can be adjusted prior to the second segment body S2 being pushed in, the first segment body S1 or the second segment body S2, the engagement piece 4, etc. Even if there is a manufacturing error, the first nut member 7 or the like can eliminate the influence of the manufacturing error and generate a predetermined attraction force.
Also, with this configuration, it is not necessary to form a dovetail portion in the second segment body S2 as in the case of the first segment body S1, so the weight of the second segment body S2 can be reduced.
[0022]
As shown in FIG. 1, the engagement piece 4 has a second segment main body S2 so that the front end of the engagement piece 4 is retracted to the back in the pushing direction y from the end of the second segment main body S2. It is attached to. Therefore, when the second segment body S2 is pushed in by the pushing means J provided on the tunnel shield, for example, the pushing surface by the pushing means J is the end face of the second segment body S2 facing forward in the tunnel excavation direction. Thus, there is no need to consider the position of the engagement piece 4 in particular. As a result, the position of the pushing means J is not limited, and the pushing work can be simplified as compared with the case where the conventional connecting portion is provided.
[0023]
(Concatenation operation)
When the second segment body S2 is pushed into the first segment body S1 that has already been constructed, the second segment body S2 is moved so that the engagement surface 5 comes into contact with the engaged surface 2. It is made to adjoin to the segment main body S1. At this time, the bolt member 3 is positioned so as to be inserted into the slit 1 of the first connecting portion R1. That is, when the second segment main body S2 is pushed in, after the bolt member 3 is inserted into the slit 1, the slit 1 serves as a guide portion, and the second segment main body S2 can be pushed in smoothly.
The distance between the engagement surface 5 and the second abutting surface F2 is a distance between the first abutting surface F1 and the engaged surface 2 so that a predetermined deformation can be caused in the cylindrical member H1. Is set to be smaller than that.
[0024]
FIG. 2 shows an operation mode of the cylindrical member H1. FIG. 2A shows a state in which the engaging surface 5 and the engaged surface 2 are in contact with each other due to the pressing of the second segment body S2. When the second segment body S2 is further pushed in from this state, a compressive force is applied to the cylindrical member H1, and the engagement piece is pushed in while increasing the amount of elastic compression deformation of the cylindrical member H1. At this stage, since the compression force is within the elastic limit of the cylindrical member H1, the cylindrical member H1 is merely elastically deformed, and no noticeable deformation occurs.
However, when the second segment body S2 is further pushed in, the compression force increases beyond the elastic limit of the cylindrical member H1, and the cylindrical member H1 undergoes bending deformation, which is plastic deformation. Thereafter, the amount of bending deformation continues to increase as the second segment body S2 is pushed, and the state shown in FIG. 2B is reached, and the pushing of the second segment body S2 is completed.
[0025]
In the connecting portion of the present invention, as a result of the provision of the cylindrical member H1, a constant attractive force is generated between the engaged surface 2 and the engaging surface 5 when the second segment body S2 is pushed. Can be made.
FIG. 3 shows the compressive deformation characteristics of the cylindrical member H1.
When the cylindrical member H1 is compressed along the axial direction, the cylindrical member H1 is elastically compressed and deformed in an initial stage from the origin 0 to the point a. When the compressive load P reaches point a, out-of-plane deformation accompanied by plastic deformation starts to occur in the cylindrical member H1. Thereafter, as shown from point a to point b, even if pressing is continued for a while, the load P applied to the cylindrical member H1 does not increase and only out-of-plane deformation proceeds. When the point b is reached, the out-of-plane deformation turns into buckling, and the load P applied to the cylindrical member H1 decreases a little sharply to the point c. At the point c, the deformation of the cylindrical member H1 is almost completed. Thereafter, even if the pressing is continued, the compression deformation does not occur and only the load P increases.
In the present embodiment, among the deformation characteristics of the cylindrical member H1, the characteristics from point a to point b are used. That is, within this range, when the second segment main body S2 is pushed in, a certain load is generated on the cylindrical member H1, that is, attraction that occurs between the engaging surface 5 and the engaged surface 2. This is because the force is also kept constant.
[0026]
As described above, when the cylindrical member H1 is used, for example, an error in the distance between the second butting surface F2 and the engaging surface 5 is within a stroke range from point a to point b in FIG. For example, the first segment body S1 and the second segment body S2 can be connected with a predetermined attractive force. According to this configuration, since the processing error of the first connecting portion R1 or the second connecting portion R2 can be absorbed in a wide range, the labor for manufacturing the first connecting portion R1 and the like can be greatly reduced.
[0027]
The cylindrical member H1 can be formed using a material that is relatively easily deformed, such as aluminum, copper, lead, or a thin steel material. That is, if these materials are used, the plastic deformation ability is stable, so that the cylindrical member H1 having a desired deformation property can be easily obtained.
[0028]
(Function and effect)
As described above, the first connecting portion R1 and the second connecting portion R2 can be manufactured very easily by using the connecting portion of the tunnel segment of this configuration, and the first segment main body S1 and the second segment main body S2 can be formed. Since it is not necessary to form the dovetail portion as in the prior art, the first segment body S1 and the second segment body S2 can be reduced in weight.
Further, when the second segment main body S2 is pushed in, the engaging piece 4 is also pushed in. Therefore, the pushing position when pushing in the second segment main body S2 is not particularly limited, and the pushing operation becomes simple.
Furthermore, since the position of the engagement surface 5 can be adjusted prior to the pushing of the second segment body S2, regardless of the manufacturing errors of the first connection part R1 and the second connection part R2, the first segment body S1 and An expected attraction force can be generated between the second segment body S2. In addition, when the second segment main body S2 is pushed in, a substantially constant attractive force can be generated between the first segment main body S1 and the second segment main body S2 by the deformation of the cylindrical member H1. The main bodies can be more reliably connected.
[0029]
[Another embodiment]
<1> The configuration of the second connecting portion R2 is not limited to the above configuration. For example, the cylindrical member H1 is inserted between the engagement piece 4 and the second nut member 8. There may be.
In short, the cylindrical member H1 is plastically deformed when the second segment main body S2 is pushed in, and any configuration can be used as long as the distance between the second butting surface F2 and the engaging surface 5 is separated. Also good.
[0030]
For example, the end portion of the bolt member 3 is screwed into the end portion S2a of the second segment main body S2, and the other end portion of the bolt member 3 is passed through the engaging piece 4 and then the end portion is cylindrical. If it is the composition which attaches member H1, one end of bolt member 3 will be united with end S2a of the 2nd segment main part S2. Therefore, when the second segment body S2 is pushed in, the bolt member 3 does not fall down and the posture of the engaging piece 4 is stabilized, so that the engaging surface 5 and the engaged surface 2 can be smoothly engaged. it can.
[0031]
<2>
In the above embodiment, the cylindrical member H1 that is plastically deformed by receiving an external force along the tunnel circumferential direction X is not limited to this configuration, and as shown in FIG. It is also possible to use a spring member 9 that undergoes an external compressive deformation or elastic tensile deformation in response to an external force.
Here, as in the above-described alternative embodiment <1>, the end of the bolt member 3 is screwed into the end S2a of the second segment body S2, and the other end of the bolt member 3 is engaged. After passing through the piece 4, the spring member 9 can be attached to the end portion.
As the spring member, for example, a spring washer, a coil spring, or the like can be used.
[0032]
In the case of this different embodiment, the spring member 9 is subjected to compressive deformation, but a substantially proportional relationship is established between the load required at that time and the amount of deformation of the spring member 9. Therefore, by adjusting the first nut member 7 or the second nut member 8 in advance and adjusting the distance between the first butting surface F1 and the engaging surface 5 before pushing in the second segment body S2. The amount of deformation of the spring member 9 in the state where the pressing of the second segment S2 is completed can be set. By setting the attracting force generated by the deformation to be greater than or equal to the attracting force to be generated between the first segment body S1 and the second segment body S2, a connecting portion having sufficient strength can be obtained. it can.
Moreover, even if the attraction force between 1st segment main body S1 and 2nd segment main body S2 falls after connection is complete | finished by generating the attraction force more than necessary, the situation will arise. The lowering of the attractive force can be compensated by the restoring force of the spring member 9.
Thus, in the case of this separate embodiment, dovetails and the like are formed in the first segment body S1 and the second segment body S2 while facilitating the processing of the first connection part R1 and the second connection part R2. This eliminates the need to reduce the weight of these segment bodies. Since the engaging piece 4 is substantially integrated with the second segment body S2, the position of the pushing means J is not limited when the second segment body S2 is pushed in, and the pushing work is facilitated. And the connection part which can ensure the attractive force of a connection part reliably and has sufficient intensity | strength can be obtained.
[0033]
<3>
In the above embodiment, the engaging surface 5 and the engaged surface 2 are provided one by one in the tunnel radial direction Z in each of the first connecting portion R1 and the second connecting portion R2, but this is shown in FIG. Thus, the engaging surface 5 and the engaged surface 2 may be provided at two locations in the same direction.
With this configuration, the bending force acting between the first segment body S1 and the second segment body S2 can be effectively countered, and a strong connection portion can be obtained.
[0034]
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 portion of a tunnel segment according to the present invention.
FIG. 2 is an explanatory view showing a connection mode of a connecting portion.
FIG. 3 is an explanatory view showing compression deformation characteristics of a cylindrical member H1.
FIG. 4 is an explanatory view showing a connection mode of a connection unit according to another embodiment.
FIG. 5 is a perspective view showing an outline of a connecting portion of a tunnel segment according to another embodiment.
FIG. 6 is a perspective view showing an outline of a connecting portion of a tunnel segment according to the prior art.
[Explanation of symbols]
2 engaged surface
3 Bolt member
4 engagement pieces
5 engagement surface
9 Spring member
F1 first butt surface
F2 2nd butt surface
H Deformation means
R1 first connecting part
R2 second connecting part
S1 1st segment body
S2 2nd segment body
X Tunnel circumferential direction
Y Tunnel longitudinal direction
y Pushing direction

Claims

The first segment body (S1) with the second butting surface (F2) of the second segment body (S2) in contact with the first butting surface (F1) of the already constructed first segment body (S1). ) And the second segment body (S2) in the tunnel circumferential direction (X) to construct a tunnel wall,
A first connecting portion (R1) is provided in the vicinity of the first abutting surface (F1), and a second connecting portion (R2) is provided in the vicinity of the second abutting surface (F2);
By pushing the second segment body (S2) from the near side to the back side along the tunnel longitudinal direction (Y) with respect to the first segment body (S1), the first connecting portion (R1) and the second segment body (S1) A connecting portion of a tunnel segment that engages and attracts a connecting portion (R2) to connect the first segment body (S1) and the second segment body (S2),
Both of the engaging surface (5) and the engaged surface (2) which are inclined in the tunnel circumferential direction (X) with respect to the pushing direction (y) of the second segment main body (S2) and can be engaged with each other. Are distributed to the second connection part (R2) and the first connection part (R1),
When the engaging surface (5) and the engaged surface (2) attract each other by pushing the second segment body (S2), the engaging surface (5) and the engaged surface (2) A connecting portion of a tunnel segment provided with deformation means (H) that can be deformed by receiving an external force along the same direction (X) so that at least one of the two can move along the circumferential direction (X) of the tunnel .

The second segment body (S2) is provided with a bolt member (3) extending in the tunnel circumferential direction (X), and the engagement piece (4) supported by the bolt member (3) is engaged with the engagement. The connecting portion of a tunnel segment according to claim 1, wherein a surface (5) is provided and the deformation means (H) is provided on the bolt member (3).

The connection part of the segment for tunnels of Claim 2 which is the cylinder member (H1) in which the said deformation | transformation means (H) receives the external force along the said tunnel circumferential direction (X), and deforms plastically.

The connection part of the segment for tunnels of Claim 2 whose said deformation | transformation means (H) is a spring member (9) which receives the external force along the said tunnel circumferential direction (X), and elastically deforms or deforms elastically.

A pair of engaged surfaces (2) adjacent to the radial direction (Z) of the tunnel is provided in the first connecting portion (R1),
The connection of the segment for tunnels in any one of Claim 1 to 4 which provided the pair of said engaging surface (5) adjacent to the radial direction (Z) of the said tunnel in the said 2nd connection part (R2). Department.