JP3973473B2

JP3973473B2 - Tunnel segment connection structure

Info

Publication number: JP3973473B2
Application number: JP2002103758A
Authority: JP
Inventors: 勝彦向野; 敏行青木; 和則辻本
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2002-04-05
Filing date: 2002-04-05
Publication date: 2007-09-12
Anticipated expiration: 2022-04-05
Also published as: JP2003293694A

Description

【０００１】
【発明の属する技術分野】
本発明は、トンネル周方向で隣り合うセグメントどうしの突合せ部の各々に、トンネル長手方向に沿うセグメント側嵌合面を当該セグメントのトンネル周方向内方側に向けて形成してある蟻溝部を設け、前記両セグメントの蟻溝部に亘ってトンネル長手方向から押し込んでそれらのセグメントどうしを連結する連結具に、各セグメントのセグメント側嵌合面に各別に嵌合させる一対の連結具側嵌合面をトンネル周方向に対向するように形成し、前記セグメント側嵌合面と連結具側嵌合面との各嵌合部どうしのトンネル周方向の間隔を、前記連結具の押し込み方向下手側ほど広くなるように設け、トンネル長手方向に沿って相対移動自在に互いに嵌合する長溝部と凸部とを、各突合せ部に振り分けて設け、前記連結具を、一方の連結具側嵌合面が一方のセグメントのセグメント側嵌合面に嵌合するように、当該セグメントの蟻溝部に装着して、前記連結具の他方の連結具側嵌合面が他方のセグメントの蟻溝部に入り込み、かつ、前記長溝部と前記凸部とが互いに嵌合するように、前記両セグメントの突合せ部どうしをトンネル長手方向に位置をずらして突き合わせた状態で、前記連結具の他方の連結具側嵌合面が他方のセグメントのセグメント側嵌合面に嵌合するように、前記長溝部と前記凸部とを相対移動させながら、前記セグメントどうしをトンネル長手方向に互いに近接するように相対移動させて、前記セグメントどうしをトンネル周方向に引き寄せながら連結するように構成してあ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】
上記トンネル用セグメントの連結構造は、トンネル周方向で隣り合うセグメントどうしの各突合せ部に設けた両蟻溝部に亘って、連結具をトンネル長手方向から押し込んで、トンネル周方向に対向するように形成してある一対の連結具側嵌合面の各々を、各蟻溝部にトンネル周方向内方側に向けて形成してあるトンネル長手方向に沿うセグメント側嵌合面に各別に嵌合させて、それらのセグメントどうしを連結できるようにしたもので、セグメント側嵌合面と連結具側嵌合面との各嵌合部どうしのトンネル周方向の間隔を、連結具の押し込み方向下手側ほど広くなるように設けて、連結具の押し込みに伴って両セグメントをトンネル周方向に互いに引き寄せながら連結できるようにしてある。
【０００３】
また、上記のように連結するにあたって、各セグメント側嵌合面と連結具側嵌合面とを確実に嵌合できるように、突合せ部どうしのセグメント厚み方向の相対位置を位置決めしながら連結具を押し込んで、突合せ部どうしを精度良く円滑に連結できるようにする必要がある。
【０００４】
そこで、一方の連結具側嵌合面が一方のセグメントのセグメント側嵌合面に嵌合するように、当該セグメントの蟻溝部に連結具を装着しておいて、その連結具の他方の連結具側嵌合面が他方のセグメントの蟻溝部に入り込み、かつ、各突合せ部に振り分けて設けた長溝部と凸部とが互いに嵌合するように、突合せ部どうしをトンネル長手方向に位置をずらして突き合わせ、その状態で、連結具の他方の連結具側嵌合面が他方のセグメントのセグメント側嵌合面に嵌合するように、長溝部と凸部とを互いに嵌合させたままトンネル長手方向に沿って相対移動させて、突合せ部どうしのセグメント厚み方向の相対位置を長溝部と凸部との嵌合で位置決めしながら、セグメントどうしをトンネル長手方向に互いに近接するように相対移動させ、セグメントどうしをトンネル周方向に引き寄せながら連結できるようにしてある。
【０００５】
そして、従来のトンネル用セグメントの連結構造では、金属製の箱状枠組みでセグメントを構成し、そのセグメントの突合せ部に、長溝部と蟻溝部とをセグメント厚み方向で重複するように並べて設けている。
【０００６】
【発明が解決しようとする課題】
このため、突合せ部どうしを精度良く円滑に連結できる利点があるものの、セグメントの厚さを、少なくとも長溝部と蟻溝部とをセグメント厚み方向で重複するように並べて設けることができるように、厚く設定する必要があり、そのためにコスト高になり、また、セグメントの運搬や組み付けなどの取り扱いの容易化と、セグメント設置用の土砂掘削量の軽減を図りにくくなる欠点がある。
【０００７】
本発明は上記実情に鑑みてなされたものであって、突合せ部どうしを精度良く円滑に連結できる利点を損なうことなく、セグメントの厚さを薄くして、セグメントの運搬や組み付けなどの取り扱いの容易化と土砂掘削量の軽減を図り易くすることを目的とする。
また、他の目的は、セグメントの必要強度を確保しながら、その厚さを薄くできるようにすることにある。
【０００８】
【課題を解決するための手段】
請求項１記載の発明の特徴構成は、トンネル周方向で隣り合うセグメントどうしの突合せ部の各々に、トンネル長手方向に沿うセグメント側嵌合面を当該セグメントのトンネル周方向内方側に向けて形成してある蟻溝部を設け、前記両セグメントの蟻溝部に亘ってトンネル長手方向から押し込んでそれらのセグメントどうしを連結する連結具に、各セグメントのセグメント側嵌合面に各別に嵌合させる一対の連結具側嵌合面をトンネル周方向に対向するように形成し、前記セグメント側嵌合面と連結具側嵌合面との各嵌合部どうしのトンネル周方向の間隔を、前記連結具の押し込み方向下手側ほど広くなるように設け、トンネル長手方向に沿って相対移動自在に互いに嵌合する長溝部と凸部とを、各突合せ部に振り分けて設け、前記連結具を、一方の連結具側嵌合面が一方のセグメントのセグメント側嵌合面に嵌合するように、当該セグメントの蟻溝部に装着して、前記連結具の他方の連結具側嵌合面が他方のセグメントの蟻溝部に入り込み、かつ、前記長溝部と前記凸部とが互いに嵌合するように、前記両セグメントの突合せ部どうしをトンネル長手方向に位置をずらして突き合わせた状態で、前記連結具の他方の連結具側嵌合面が他方のセグメントのセグメント側嵌合面に嵌合するように、前記長溝部と前記凸部とを相対移動させながら、前記セグメントどうしをトンネル長手方向に互いに近接するように相対移動させて、前記セグメントどうしをトンネル周方向に引き寄せながら連結するように構成してあるトンネル用セグメントの連結構造であって、前記長溝部と前記蟻溝部とを、長溝部が蟻溝部に連通する状態で、トンネル長手方向に沿って略同一線上で前後に配置してある点にある。
【０００９】
〔作用〕
セグメントの突合せ部に、長溝部と蟻溝部とをトンネル長手方向に沿って略同一線上で前後に配置してあるので、セグメントの厚みを従来に比べて薄くすることができる。
【００１０】
〔効果〕
突合せ部どうしを精度良く円滑に連結できる利点を損なうことなく、セグメントの厚さを薄くして、よりコスト安に形成で、しかも、セグメントの運搬や組み付けなどの取り扱いの容易化と土砂掘削量の軽減を図り易い。
【００１１】
請求項２記載の発明の特徴構成は、金属製の箱状枠組みをその枠組み内に打設した鉄筋コンクリートで補強して前記セグメントを構成してある点にある。
【００１２】
〔作用〕
金属製の箱状枠組みをその枠組み内に打設した鉄筋コンクリートで補強してセグメントを構成するので、セグメントの厚みを薄くしてもセグメントの強度を確保し易い。
【００１３】
〔効果〕
セグメントの必要強度を確保しながら、その厚さを薄くできる。
【００１４】
【発明の実施の形態】
以下に本発明の実施の形態を図面に基づいて説明する。
〔第１実施形態〕
図１は、六個のトンネル用セグメント１を後述する連結具２でトンネル周方向に互いに引き寄せて連結してある筒状のセグメントリングＲを示しており、このセグメントリングＲの複数を、抗口側に設置済みのセグメントリングＲに対してシールドマシン等による切羽側から、トンネル周方向での連結箇所が隣り合うセグメントリングＲにおける連結箇所に対して周方向にずれるように、トンネル長手方向に順次連結してトンネルＴを構築するようにしてある。
【００１５】
前記セグメントリングＲは、周方向で隣り合うセグメント１どうしを連結しながら、同時に、既設のセグメントリングＲの切羽側に連結して順次連結してあり、図２に示すように、既設のセグメントリングＲの切羽側下部に対して、中央セグメントａ（１) を最初に連結した後、その中央セグメントａ（１) の両側に側部セグメントｂ（１) と上部セグメントｃ（１) とを順次連結し、左右の上部セグメントｃ（１) 間にキーセグメントｄ（１) を嵌合して、筒状に連結してある。
【００１６】
前記セグメント１（ａ〜ｄ) の各々は、図３，図４に例示するように、ダクタイル鋳鉄製の箱状枠組み３を、その箱状枠組み３内に打設した鉄筋コンクリート４で補強して構成してある。
【００１７】
つまり、図３，図４に示すように、内面にジベル５を一体形成してある矩形円弧板状の外周壁６の周縁に側板７を一体に設けて箱状に形成するとともに、その内側を側板７よりも高さが低い桁板８で升目状に区画して箱状枠組み３を構成し、その内側を覆うように格子状に配筋した鉄筋９を、桁板８の基部に形成した貫通孔に引っ掛けた吊り下げ用鉄筋９ａで吊り下げるよう固定した後、コンクリートを充填してある。
【００１８】
以下に、本発明に係るトンネル用セグメント１の連結構造を、中央セグメントａと、その中央セグメントａにトンネル周方向で隣り合う側部セグメントｂとの連結構造を例示して説明する。
【００１９】
前記中央セグメントａは、図３，図４に示すように、セグメント外周側にグラウト材を注入するためのグラウト注入孔１０を中央部に備え、抗口側に向けて設置する抗口側端面１１には、既設のセグメントリングＲの切羽側に向けて設置してある切羽側端面１２に対する連結用の複数のリング継手１３を設け、切羽側端面１２には、切羽側で隣り合うセグメント１のリング継手１３が抜け止め状態で嵌合する複数のジョイント受け口１４を設けてある。
【００２０】
また、中央セグメントａの側部セグメントｂとの各突合せ部１５には、一端が抗口側端面１１に開口する抗口側蟻溝部１６と一端が切羽側端面１２に開口する切羽側蟻溝部１７との二個の蟻溝部１８と、側部セグメントｂ側の突合せ部１９に設けたガイドピン（凸部の一例) ２０がトンネル長手方向に沿って相対移動自在に嵌合する長溝部２１と、側部セグメントｂ側の突合せ部１９に設けた長溝部２１にトンネル長手方向に沿って相対移動自在に嵌合するガイドピン２０とを、左右対称に設けてある。
【００２１】
前記蟻溝部１８（１６，１７) の各々には、図６にも示すように、セグメント厚み方向で対向する状態でトンネル長手方向に沿う二つのセグメント側嵌合面２２を、当該中央セグメントａのトンネル周方向内方側に向けて、かつ、切羽側ほどトンネル周方向内方側に向けて入り込むように傾斜させて形成してある。
【００２２】
そして、長溝部２１の嵌合始端側が切羽側蟻溝部１７に連通する状態で、二個の蟻溝部１６，１７と長溝部２１とガイドピン２０とを、トンネル長手方向に沿って略同一線上で前後に配置してある。
【００２３】
前記側部セグメントｂは、図５，図６に示すように、中央セグメントａとの突合せ部１９の構造が中央セグメントａと異なるが、その他の構造及び寸法は中央セグメントａと同様である。
【００２４】
つまり、側部セグメントｂの中央セグメントａとの突合せ部１９にも、中央セグメントａに設けたものと同様の、一端が抗口側端面１１に開口する抗口側蟻溝部２３と一端が切羽側端面１２に開口する切羽側蟻溝部２４との二個の蟻溝部１８と、中央セグメントａのガイドピン２０がトンネル長手方向に沿って相対移動自在に嵌合する長溝部２１と、中央セグメントａの長溝部２１にトンネル長手方向に沿って相対移動自在に嵌合するガイドピン２０とを設けてあるが、長溝部２１の嵌合始端側が抗口側蟻溝部２３に連通する状態で、二個の蟻溝部２３，２４（１８) と長溝部２１とガイドピン２０とを、トンネル長手方向に沿って略同一線上で前後に配置し、切羽側蟻溝部２４の抗口側端部に、連結具２をトンネル周方向から入り込ませる連結具挿入用開口２５を形成してある。
【００２５】
前記中央セグメントａと側部セグメントｂとをトンネル周方向に互いに引き寄せながら連結する連結具２について説明する。
前記連結具２は、図６，図７に示すように、中央セグメントａ及び側部セグメントｂのセグメント側嵌合面２２に各別に嵌合させる一対の連結具側嵌合面２６をトンネル周方向に対向するように、かつ、蟻溝部１８に対する押し込み方向下手側ほど連結具側嵌合面２６間の間隔が広くなるように表裏に形成してある。
【００２６】
そして、連結具２を両セグメント１（ａ，ｂ) の蟻溝部１８に亘ってトンネル長手方向から押し込んで、連結具２の一対の連結具側嵌合面２６を両セグメント１（ａ，ｂ) のセグメント側嵌合面２２に各別に嵌合させた状態で、セグメント側嵌合面２２と連結具側嵌合面２６との各嵌合部どうしのトンネル周方向の間隔が、連結具２の押し込み方向下手側ほど広くなるように設けて、各連結具側嵌合面２６が対応するセグメント側嵌合面２２に嵌合するようにトンネル長手方向から蟻溝部１８に押し込むに伴って、セグメント１（ａ，ｂ) どうしをトンネル周方向に引き寄せながら連結できるようにしてある。
【００２７】
また、連結具２を各連結具側嵌合面２６が対応するセグメント側嵌合面２２に嵌合するようにトンネル長手方向から押し込んで、セグメント１（ａ，ｂ) どうしをトンネル周方向に引き寄せながら連結するときに、連結具２の押し込み力が所定の大きさを越えると、その押し込み力で圧縮変形させる銅などの軟質金属製の筒状バックアップ材２７を、連結具２の押し込み方向上手側端面にねじ込み固定して、セグメント１（ａ，ｂ) どうしの引き寄せ力を略一定に保持できるようにしてある。
【００２８】
前記連結具２を使用して中央セグメントａと側部セグメントｂとを連結する手順を説明する。
尚、中央セグメントａの両突合せ部１５に側部セグメントｂを左右対称に連結するので、中央セグメントａと一方の側部セグメントｂとの連結手順について説明する。
【００２９】
図６で仮想線で示すように、連結具２を、バックアップ材２７を抗口側に向けて、一方の連結具側嵌合面２６が中央セグメントａのセグメント側嵌合面２２に嵌合するように、抗口側蟻溝部１６には抗口側端面１１の開口部から装着しておき、切羽側蟻溝部１７には切羽側端面１２の開口部から装着しておく。
【００３０】
そして、中央セグメントａを、各リング継手１３が既設のセグメントリングＲの切羽側に設けてある所定のジョイント受け口１４に入り込むように、シールドマシンに装備してあるジャッキＪなどで既設のセグメントリングＲ側に押し付けて、図８に示すように、中央セグメントａをリング継手１３で既設のセグメントリングＲに連結する。
【００３１】
次に、図８に示すように、中央セグメントａの切羽側蟻溝部１７に装着した連結具２の他方の連結具側嵌合面２６が、連結具挿入用開口２５を通して側部セグメントｂの切羽側蟻溝部２４に入り込み、かつ、中央セグメントａのガイドピン２０と側部セグメントｂの長溝部２１とが互いに嵌合するとともに、側部セグメントｂのガイドピン２０と中央セグメントａの長溝部２１とが互いに嵌合するように、両セグメント１（ａ，ｂ) の突合せ部１５，１９どうしをトンネル長手方向に位置をずらして突き合わせる。
【００３２】
そして、この突き合わせ状態で、図９に示すように、中央セグメントａの切羽側蟻溝部１７に装着した連結具２の他方の連結具側嵌合面２６が、側部セグメントｂの切羽側蟻溝部２４に形成したセグメント側嵌合面２２に嵌合し、かつ、中央セグメントａの抗口側蟻溝部１６に装着した連結具２の他方の連結具側嵌合面２６が、側部セグメントｂの抗口側蟻溝部２３にその抗口側端面１１に開口している開口部から入り込んで嵌合するように、長溝部２１とガイドピン２０との各嵌合部を相対移動させてセグメント厚み方向の位置決めをしながら、側部セグメントｂを既設のセグメントリングＲ側に押し込んで、側部セグメントｂをリング継手１３で既設のセグメントリングＲに連結するとともに、中央セグメントａと側部セグメントｂとをトンネル周方向に引き寄せて連結する。
【００３３】
前記連結具２に固定してあるバックアップ材２７は、連結具２の対応するセグメント側嵌合面２２に対する押し込み力が所定の大きさを越えると、図９に示すように、抗口側蟻溝部１６、２３に装着した連結具２のバックアップ材２７は、既設のセグメントリングＲの切羽側端面１２に押し付けられることにより圧縮されて塑性変形し、また、切羽側蟻溝部１７，２４に装着した連結具２のバックアップ材２７は、切羽側蟻溝部１７内の抗口側終端面２８に押し付けられることにより圧縮されて塑性変形し、セグメント１（ａ，ｂ) どうしの引き寄せ力を略一定に保持できるようにしてある。
【００３４】
〔第２実施形態〕
図１０は、中央セグメントａと側部セグメントｂの各突合せ部１５，１９に設けた切羽側蟻溝部１７，２４（１８) の別実施形態を示し、セグメント厚み方向で対向する状態でトンネル長手方向に沿う二つのセグメント側嵌合面２２を、各セグメントａ，ｂのトンネル周方向内方側に向けて、かつ、抗口側ほどトンネル周方向内方側に向けて入り込むように傾斜させて形成してある。
【００３５】
そして、連結具２を、バックアップ材２７を切羽側に向けて、一方の連結具側嵌合面２６が側部セグメントｂのセグメント側嵌合面２２に嵌合するように、連結具挿入用開口２５を通して、側部セグメントｂの切羽側蟻溝部２４に装着しておき、両セグメント１（ａ，ｂ) の突合せ部１５，１９どうしをトンネル長手方向に位置をずらして突き合わせた状態で、側部セグメントｂの切羽側蟻溝部２４に装着した連結具２の他方の連結具側嵌合面２６が、中央セグメントａの切羽側蟻溝部１７に形成したセグメント側嵌合面２２に嵌合するように、長溝部２１とガイドピン２０との各嵌合部を相対移動させてセグメント厚み方向の位置決めをしながら、側部セグメントｂを既設のセグメントリングＲ側に押し込んで、切羽側蟻溝部１７，２４に装着した連結具２のバックアップ材２７が、側部セグメントｂの切羽側端部に設けた側板延設部２９に押し付けられることにより圧縮されて塑性変形して、セグメント１（ａ，ｂ) どうしの引き寄せ力を略一定に保持できるようにしてある。
その他の構成は第１実施形態と同様である。
【００３６】
〔その他の実施形態〕
１．本発明によるトンネル用セグメントの連結構造は、鋼板などの金属板を溶接して形成した箱状枠組みをその枠組み内に打設した鉄筋コンクリートで補強してセグメントを構成してあっても良い。
２．本発明によるトンネル用セグメントの連結構造は、鉄筋を箱状枠組みの内側に溶接固定せずに打設した鉄筋コンクリートで箱状枠組みを補強してセグメントを構成してあっても良い。
３．本発明によるトンネル用セグメントの連結構造は、鉄筋コンクリートと箱状枠組みとを接着材などで接着してあっても良い。
４．本発明によるトンネル用セグメントの連結構造は、長溝部と蟻溝部とを連通させずにトンネル長手方向に沿って略同一線上で前後に配置してあっても良い。
【図面の簡単な説明】
【図１】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】連結手順を説明する展開図
【図３】（イ) はトンネル用セグメントの内面側を示す平面図、（ロ) は切羽側端面の側面図
【図４】（イ) はトンネル用セグメントの内部を示す平面図、（ロ) は（イ) のロ−ロ線矢視図
【図５】トンネル用セグメントの内面側を示す平面図
【図６】要部の断面図
【図７】連結具の斜視図
【図８】連結手順の説明図
【図９】連結手順の説明図
【図１０】第２実施形態のトンネル用セグメントの説明図
【符号の説明】
１セグメント
２連結具
１５突合せ部
１８蟻溝部
１９突合せ部
２０凸部
２１長溝部
２２セグメント側嵌合面
２６連結具側嵌合面[0001]
BACKGROUND OF THE INVENTION
The present invention is provided with a dovetail groove portion in which a segment-side fitting surface along the tunnel longitudinal direction is formed toward the inner side in the tunnel circumferential direction of each segment at each butting portion between adjacent segments in the tunnel circumferential direction. In addition, a pair of connecting-side fitting surfaces that are fitted into the segment-side fitting surfaces of the respective segments are connected to the connecting tools that are pushed in from the longitudinal direction of the tunnel across the dovetail portions of both segments and connect the segments. It is formed so as to face the tunnel circumferential direction, and the interval in the tunnel circumferential direction between the fitting portions of the segment side fitting surface and the connector side fitting surface becomes wider toward the lower side in the pushing direction of the connector. The long groove portion and the convex portion, which are fitted to each other so as to be movable relative to each other along the tunnel longitudinal direction, are distributed to each abutting portion, and the connecting tool is connected to one connecting tool side fitting surface. Attach it to the dovetail part of the segment so that it fits to the segment-side fitting surface of one segment, the other connector-side fitting surface of the connector enters the dovetail part of the other segment, and In a state where the butted portions of the two segments are abutted while shifting the positions in the tunnel longitudinal direction so that the long groove portion and the convex portion are fitted to each other, the other fitting-side fitting surface of the coupling tool is The segments are moved relative to each other so as to be close to each other in the longitudinal direction of the tunnel while the long groove portion and the convex portion are relatively moved so as to be fitted to the segment side fitting surface of the other segment. The present invention relates to a connecting structure of tunnel segments configured to connect each other while pulling them in the circumferential direction of the tunnel.
[0002]
[Prior art]
The above-mentioned tunnel segment connection structure is formed so that the connecting tool is pushed in from the longitudinal direction of the tunnel across both dovetail portions provided at the abutting portions of adjacent segments in the tunnel circumferential direction so as to face the tunnel circumferential direction. Each of the pair of connector side fitting surfaces being fitted to each dovetail portion is individually fitted to the segment side fitting surface along the tunnel longitudinal direction formed toward the inner side in the tunnel circumferential direction, The segments can be connected to each other, and the distance between the fitting portions of the segment-side fitting surface and the connector-side fitting surface in the tunnel circumferential direction becomes wider toward the lower side in the pushing direction of the connector. Thus, the two segments can be connected while being pulled toward each other in the circumferential direction of the tunnel as the connecting tool is pushed.
[0003]
In addition, when connecting as described above, the coupling tool is positioned while positioning the relative position of the abutting portions in the segment thickness direction so that each segment side fitting surface and the coupling tool side fitting surface can be securely fitted. It is necessary to push in so that the butt portions can be smoothly and accurately connected.
[0004]
Therefore, a connecting tool is mounted on the dovetail portion of the segment so that one connecting tool side fitting surface is fitted to the segment side fitting surface of one segment, and the other connecting tool of the connecting tool is attached. The abutment parts are shifted in the tunnel longitudinal direction so that the side fitting surface enters the dovetail part of the other segment and the long groove part and the convex part provided in each abutment part fit each other. In this state, in the state of the tunnel, the long groove portion and the convex portion are fitted to each other so that the other connector side fitting surface of the connector is fitted to the segment side fitting surface of the other segment. The segments are moved relative to each other in the longitudinal direction of the tunnel while positioning the relative position in the segment thickness direction between the butted parts by fitting the long groove part and the convex part. The cement each other are also available connection while attracted to the tunnel circumferential direction.
[0005]
And in the conventional connection structure of the segment for tunnels, a segment is constituted by a metal box-like frame, and a long groove portion and a dovetail groove portion are arranged side by side so as to overlap each other in the segment thickness direction. .
[0006]
[Problems to be solved by the invention]
For this reason, although there is an advantage that the butt portions can be connected accurately and smoothly, the segment thickness is set to be thick so that at least the long groove portion and the dovetail portion can be provided side by side in the segment thickness direction. Therefore, there is a drawback that the cost becomes high, and handling of the segments such as transportation and assembly is easy, and it is difficult to reduce the amount of earth and sand excavation for installing the segments.
[0007]
The present invention has been made in view of the above circumstances, and it is easy to handle segments such as transporting and assembling them by reducing the thickness of the segments without losing the advantage that the butt portions can be connected smoothly and accurately. The purpose is to make it easier to reduce the amount of soil and excavation.
Another object is to enable the thickness of the segment to be reduced while ensuring the required strength.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the segment-side fitting surface along the tunnel longitudinal direction is formed in each of the butting portions of the segments adjacent in the tunnel circumferential direction toward the inner side in the tunnel circumferential direction of the segment. A pair of dovetails that are fitted into the segment-side fitting surface of each segment into a connector that connects the segments by pushing in from the longitudinal direction of the tunnel across the dovetails of the two segments. A connecting tool side fitting surface is formed so as to be opposed to the tunnel circumferential direction, and the interval in the tunnel circumferential direction between the fitting portions of the segment side fitting surface and the connecting tool side fitting surface is determined by the connection tool. Provided in such a way that the lower side in the pushing direction becomes wider, and a long groove portion and a convex portion, which are fitted to each other so as to be relatively movable along the longitudinal direction of the tunnel, are distributed to each abutting portion, and the coupling tool is provided. Attach to the dovetail part of the segment so that one connector-side fitting surface is fitted to the segment-side fitting surface of one segment, and the other connector-side fitting surface of the connector is the other In the state in which the butted portions of the two segments are abutted while being shifted in the tunnel longitudinal direction so that they enter the dovetail portion of the segment and the long groove portion and the convex portion are fitted to each other. The segments are brought close to each other in the tunnel longitudinal direction while relatively moving the long groove portion and the convex portion so that the other connector side fitting surface is fitted to the segment side fitting surface of the other segment. In this way, the tunnel segment connecting structure is constructed such that the segments are connected to each other while being moved toward each other in the circumferential direction of the tunnel, the long groove portion and the dovetail groove Preparative, with the long groove communicates with the dovetail groove, in that are arranged back and forth in a substantially collinear along a tunnel longitudinal direction.
[0009]
[Action]
Since the long groove portion and the dovetail groove portion are arranged in the front and back along the longitudinal direction of the tunnel at the abutting portion of the segment, the thickness of the segment can be reduced as compared with the conventional case.
[0010]
〔effect〕
The thickness of the segments can be reduced and the cost can be reduced without losing the advantage that the butt sections can be connected accurately and smoothly, and the handling and assembly of the segments can be facilitated and the amount of sediment excavation can be reduced. Easy to reduce.
[0011]
The characteristic configuration of the invention described in claim 2 resides in that the segment is configured by reinforcing a metal box-shaped frame with reinforced concrete placed in the frame.
[0012]
[Action]
Since the segment is formed by reinforcing a metal box-shaped frame with reinforced concrete placed in the frame, it is easy to ensure the strength of the segment even if the segment is thin.
[0013]
〔effect〕
The thickness can be reduced while ensuring the required strength of the segment.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 shows a cylindrical segment ring R in which six tunnel segments 1 are connected to each other in the circumferential direction of the tunnel by a connecting tool 2 to be described later. Sequentially in the tunnel longitudinal direction so that the connecting part in the tunnel circumferential direction is shifted in the circumferential direction with respect to the connecting part in the adjacent segment ring R from the face side by the shield machine or the like with respect to the segment ring R already installed on the side The tunnel T is constructed by connecting them.
[0015]
The segment ring R is connected to the face side of the existing segment ring R at the same time while connecting the adjacent segments 1 in the circumferential direction, and as shown in FIG. The central segment a (1) is first connected to the lower face side of R, and then the side segment b (1) and the upper segment c (1) are sequentially connected to both sides of the central segment a (1). The key segment d (1) is fitted between the left and right upper segments c (1) and connected in a cylindrical shape.
[0016]
As shown in FIGS. 3 and 4, each of the segments 1 (a to d) is constructed by reinforcing a box-shaped frame 3 made of ductile cast iron with a reinforced concrete 4 placed in the box-shaped frame 3. It is.
[0017]
That is, as shown in FIGS. 3 and 4, the side plate 7 is integrally formed on the peripheral edge of the rectangular arc plate-shaped outer peripheral wall 6 in which the dowel 5 is integrally formed on the inner surface, and the inner side thereof is formed. A box-like framework 3 is configured by dividing the grid 8 in a grid shape with a height lower than that of the side plate 7, and reinforcing bars 9 arranged in a lattice shape so as to cover the inside are formed at the base of the girder 8. After being fixed so as to be suspended by the suspension rebar 9a hooked in the through hole, concrete is filled.
[0018]
Below, the connection structure of the segment 1 for tunnels which concerns on this invention is demonstrated exemplifying the connection structure of the center segment a and the side segment b adjacent to the center segment a in the tunnel circumferential direction.
[0019]
As shown in FIGS. 3 and 4, the central segment a has a grout injection hole 10 for injecting a grout material on the outer periphery side of the segment in the central portion, and is installed on the anti-mouth side end face 11 facing the anti-mouth side. Are provided with a plurality of ring joints 13 for connection to the face side end face 12 installed toward the face side of the existing segment ring R. The ring 1 of the segment 1 adjacent on the face side is provided on the face side end face 12. A plurality of joint receptacles 14 are provided in which the joint 13 is fitted in a retaining state.
[0020]
Further, each abutting portion 15 of the central segment a with the side segment b has an anti-mouth side dovetail groove portion 16 whose one end opens to the anti-mouth side end surface 11 and a face side dovetail groove portion 17 whose one end opens to the face side end surface 12. And a dovetail groove portion 18 and a guide groove (an example of a convex portion) 20 provided in the abutting portion 19 on the side segment b side, and a long groove portion 21 in which a relatively movable fitting is performed along the tunnel longitudinal direction, A guide pin 20 that is fitted to the long groove portion 21 provided in the abutting portion 19 on the side segment b side so as to be relatively movable along the tunnel longitudinal direction is provided symmetrically.
[0021]
As shown in FIG. 6, each of the dovetail portions 18 (16, 17) has two segment-side fitting surfaces 22 along the tunnel longitudinal direction in a state facing each other in the segment thickness direction. It is formed so as to be inclined toward the inner side in the circumferential direction of the tunnel and so as to enter the inner side in the circumferential direction of the tunnel toward the face side.
[0022]
Then, in a state where the fitting start end side of the long groove portion 21 communicates with the face side dovetail groove portion 17, the two dovetail groove portions 16, 17, the long groove portion 21, and the guide pin 20 are approximately collinear along the tunnel longitudinal direction. It is arranged at the front and back.
[0023]
5 and 6, the side segment b is different from the central segment a in the structure of the butting portion 19 with the central segment a, but the other structures and dimensions are the same as the central segment a.
[0024]
In other words, the abutting portion 19 of the side segment b with the central segment a is similar to the one provided in the central segment a, and has an anti-mouth side dovetail groove portion 23 having one end opening in the anti-mouth side end surface 11 and one end on the face side. Two dovetail groove portions 18 with the face side dovetail groove portion 24 opened in the end face 12, a long groove portion 21 in which the guide pin 20 of the central segment a is fitted so as to be relatively movable along the tunnel longitudinal direction, and the central segment a A guide pin 20 is provided in the long groove portion 21 so as to be relatively movable along the tunnel longitudinal direction. In the state where the fitting start end side of the long groove portion 21 communicates with the anti-mouth side dovetail groove portion 23, two guide pins 20 are provided. The dovetail groove portions 23 and 24 (18), the long groove portion 21 and the guide pin 20 are arranged on the front and rear sides on the substantially same line along the longitudinal direction of the tunnel. From the tunnel circumferential direction It is formed with sintered tool insertion opening 25.
[0025]
The connector 2 that connects the central segment a and the side segment b while pulling each other in the circumferential direction of the tunnel will be described.
As shown in FIGS. 6 and 7, the connector 2 includes a pair of connector-side fitting surfaces 26 that are fitted to the segment-side fitting surfaces 22 of the central segment a and the side segment b, respectively, in the tunnel circumferential direction. Are formed on the front and back so that the distance between the fitting-side fitting surfaces 26 increases toward the lower side in the pushing direction with respect to the dovetail groove portion 18.
[0026]
Then, the connector 2 is pushed in from the longitudinal direction of the tunnel across the dovetail portion 18 of both segments 1 (a, b), and the pair of connector-side fitting surfaces 26 of the connector 2 are connected to both segments 1 (a, b). In the state of being fitted to the segment-side fitting surfaces 22 of the respective segments, the distance between the fitting portions of the segment-side fitting surface 22 and the connector-side fitting surface 26 in the tunnel circumferential direction is that of the connector 2. As the lower side in the pushing direction becomes wider, each segment 1 is pushed into the dovetail groove 18 from the longitudinal direction of the tunnel so that each coupling-side fitting surface 26 is fitted to the corresponding segment-side fitting surface 22. (A, b) The two can be connected while being drawn in the circumferential direction of the tunnel.
[0027]
Further, the connector 2 is pushed in from the tunnel longitudinal direction so that each connector-side fitting surface 26 is fitted to the corresponding segment-side fitting surface 22, and the segments 1 (a, b) are pulled in the tunnel circumferential direction. However, if the pushing force of the connecting tool 2 exceeds a predetermined magnitude when connecting, the cylindrical backup material 27 made of soft metal such as copper, which is compressed and deformed by the pushing force, is connected to the upper side in the pushing direction of the connecting tool 2. It is fixed to the end face by screwing so that the pulling force between the segments 1 (a, b) can be held substantially constant.
[0028]
A procedure for connecting the central segment a and the side segment b using the connector 2 will be described.
In addition, since the side segment b is connected to the both abutting portions 15 of the central segment a symmetrically, a procedure for connecting the central segment a and one side segment b will be described.
[0029]
As shown by phantom lines in FIG. 6, the connector 2 is fitted to the segment-side fitting surface 22 of the central segment a with the back-up material 27 facing the anti-mouth side and one connector-side fitting surface 26. As described above, the anti-mouth side dovetail groove portion 16 is attached from the opening portion of the anti-mouth side end surface 11, and the face side dovetail groove portion 17 is attached from the opening portion of the face side end surface 12.
[0030]
Then, the existing segment ring R is installed with a jack J or the like provided in the shield machine so that the center segment a enters the predetermined joint receiving port 14 provided on the face side of the existing segment ring R. As shown in FIG. 8, the center segment a is connected to the existing segment ring R by the ring joint 13.
[0031]
Next, as shown in FIG. 8, the other connector-side fitting surface 26 of the connector 2 attached to the face-side dovetail portion 17 of the central segment a passes through the connector insertion opening 25 and the face of the side segment b. The guide pin 20 of the central segment a and the long groove portion 21 of the side segment b fit into each other, and the guide pin 20 of the side segment b and the long groove portion 21 of the central segment a Are abutted by shifting the positions of the butted portions 15 and 19 of both segments 1 (a, b) in the tunnel longitudinal direction.
[0032]
In this butted state, as shown in FIG. 9, the other connector-side fitting surface 26 of the connector 2 attached to the face-side dovetail portion 17 of the central segment a is the face-side dovetail portion of the side segment b. 24, the other connector-side fitting surface 26 of the connector 2 fitted to the segment-side fitting surface 22 formed in 24 and attached to the anti-mouth side dovetail portion 16 of the central segment a is connected to the side segment b. Each fitting portion of the long groove portion 21 and the guide pin 20 is relatively moved so as to enter and fit into the anti-mouth side dovetail groove portion 23 from the opening portion opened in the anti-mouth side end surface 11, and thereby the segment thickness direction While positioning the side segment b, the side segment b is pushed into the existing segment ring R side, the side segment b is connected to the existing segment ring R by the ring joint 13, and the central segment a and the side segment b are connected to each other. Tunnel linking attract in the circumferential direction.
[0033]
As shown in FIG. 9, the backup material 27 fixed to the connector 2 has an anti-mouth side dovetail portion when the pushing force of the connector 2 against the corresponding segment-side fitting surface 22 exceeds a predetermined magnitude. The back-up material 27 of the connector 2 attached to 16 and 23 is compressed and plastically deformed by being pressed against the face side end face 12 of the existing segment ring R, and is connected to the face side dovetail groove portions 17 and 24. The back-up material 27 of the tool 2 is compressed and plastically deformed by being pressed against the anti-mouth end surface 28 in the face side dovetail groove portion 17, and the pulling force between the segments 1 (a, b) can be kept substantially constant. It is like that.
[0034]
[Second Embodiment]
FIG. 10 shows another embodiment of the face side dovetail groove portions 17 and 24 (18) provided in the respective abutting portions 15 and 19 of the central segment a and the side segment b, and the tunnel longitudinal direction in a state facing each other in the segment thickness direction. Are formed so as to be inclined toward the inner side in the tunnel circumferential direction of the segments a and b and toward the inner side in the tunnel circumferential direction toward the anti-mouth side. It is.
[0035]
Then, the connector 2 is opened so that the back-up material 27 faces the face and the one connector-side fitting surface 26 is fitted to the segment-side fitting surface 22 of the side segment b. 25, is attached to the face-side dovetail portion 24 of the side segment b, and the butted portions 15 and 19 of both segments 1 (a, b) are abutted with their positions shifted in the tunnel longitudinal direction. The other connector-side fitting surface 26 of the connector 2 attached to the face-side dovetail portion 24 of the segment b is fitted to the segment-side fitting surface 22 formed in the face-side dovetail portion 17 of the central segment a. The side segment b is pushed into the existing segment ring R side while positioning in the segment thickness direction by relatively moving the fitting portions of the long groove portion 21 and the guide pin 20, and the face side dovetail groove portions 17, 24 are pushed. In The back-up material 27 of the connected connector 2 is compressed and plastically deformed by being pressed against the side plate extending portion 29 provided at the end portion of the side face of the side segment b, so that the segments 1 (a, b) The attractive force can be kept substantially constant.
Other configurations are the same as those of the first embodiment.
[0036]
[Other Embodiments]
1. The tunnel segment connection structure according to the present invention may be formed by reinforcing a box-shaped frame formed by welding a metal plate such as a steel plate with reinforced concrete placed in the frame.
2. The connecting structure of the tunnel segments according to the present invention may be formed by reinforcing the box-shaped frame with reinforced concrete in which the reinforcing bars are cast without being fixed to the inside of the box-shaped frame.
3. In the connection structure of the tunnel segment according to the present invention, the reinforced concrete and the box-shaped frame may be bonded with an adhesive or the like.
4). The tunnel segment connecting structure according to the present invention may be arranged back and forth on substantially the same line along the tunnel longitudinal direction without connecting the long groove portion and the dovetail portion.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a connecting structure of tunnel segments. FIG. 2 is a development view explaining a connecting procedure. FIG. 3A is a plan view showing an inner surface side of a tunnel segment. Side view of the face side of the face [Fig. 4] (A) is a plan view showing the inside of the tunnel segment, (B) is a view taken along the arrow line of (A) [Fig. 5] The inner side of the tunnel segment Fig. 6 is a cross-sectional view of the main part. Fig. 7 is a perspective view of the coupling tool. Fig. 8 is an explanatory diagram of the coupling procedure. Fig. 9 is an explanatory diagram of the coupling procedure. Fig. 10 is for the tunnel of the second embodiment. Illustration of segments [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Segment 2 Connector 15 Butting part 18 Dovetail part 19 Butting part 20 Convex part 21 Long groove part 22 Segment side fitting surface 26 Connecting tool side fitting surface

Claims

In each of the butting portions of the adjacent segments in the tunnel circumferential direction, a dovetail groove portion is provided in which a segment side fitting surface along the tunnel longitudinal direction is formed toward the inner side in the tunnel circumferential direction of the segment,
A pair of connector side fitting surfaces that are fitted to the segment side fitting surfaces of each segment are tunneled to the connecting tools that are pushed in from the tunnel longitudinal direction across the dovetail portions of both segments and connect the segments. Formed so as to face in the circumferential direction,
The interval in the tunnel circumferential direction between the fitting portions of the segment-side fitting surface and the connector-side fitting surface is provided so as to be wider toward the lower side in the pushing direction of the connector,
A long groove part and a convex part, which are fitted to each other so as to be relatively movable along the longitudinal direction of the tunnel, are distributed to each abutting part,
The connector is attached to the dovetail portion of the segment so that one connector side fitting surface is fitted to the segment side fitting surface of the one segment, and the other connector side fitting of the connector is In a state where the butted portions of the two segments are shifted in the longitudinal direction of the tunnel so that the mating surface enters the dovetail portion of the other segment and the long groove portion and the convex portion are fitted to each other. , While moving the long groove portion and the convex portion relative to each other so that the other connector side fitting surface of the connector is fitted to the segment side fitting surface of the other segment, It is a connecting structure for tunnel segments that is configured to be moved while being relatively close to each other in the direction and connected while pulling the segments in the circumferential direction of the tunnel,
A tunnel segment connecting structure in which the long groove portion and the dovetail groove portion are arranged back and forth on substantially the same line along the tunnel longitudinal direction with the long groove portion communicating with the dovetail groove portion .

2. The connecting structure for a tunnel segment according to claim 1, wherein the segment is formed by reinforcing a metal box-shaped frame with reinforced concrete cast in the frame.