JP3898595B2

JP3898595B2 - Installation structure and construction method of precast lining members

Info

Publication number: JP3898595B2
Application number: JP2002228814A
Authority: JP
Inventors: 博幸須田; 正典岡村; 三郎奥野
Original assignee: Okumura Corp
Current assignee: Okumura Corp
Priority date: 2002-08-06
Filing date: 2002-08-06
Publication date: 2007-03-28
Anticipated expiration: 2022-08-06
Also published as: JP2004068408A

Description

【０００１】
【発明の属する技術分野】
本発明は、トンネル壁面をプレキャスト覆工部材によって覆工する際に、このプレキャスト覆工部材の両側壁部の下端をトンネル内の両側基礎コンクリート上の正確な位置に設置する設置構造と、該プレキャスト覆工部材の施工方法に関するものである。
【０００２】
【従来の技術】
新設トンネルのトンネル壁面にプレキャスト覆工部材を施工する場合、あるいは、既設トンネルにおいてはその改修、拡幅、補強などの目的でトンネル壁面にプレキャスト覆工部材を施工する場合、従来から、トンネル壁面に沿って組み立てたプレキャスト覆工部材の両側壁部の下端部をトンネル内の両側基礎コンクリート上とトンネル壁面の両端部とに支持させた構造としている。
【０００３】
即ち、図17に示すように、プレキャスト覆工部材Ａの下端部に埋め込みボルト21の上端部を埋設、固着して該埋め込みボルト21をプレキャスト覆工部材Ａの下端面から垂直下方に突出させていると共に、水平固定板22a とこの水平固定板22a の外端面に垂直固定板22b を一体に固着してなる取付金具22を用い、この取付金具22の上記水平固定板22a に設けている取付孔22c を上記埋め込みボルト21に挿通させて該水平固定板22a の上面をプレキャスト覆工部材Ａの下端面に当接させた状態でナット23により固定する一方、基礎コンクリートＢの天端面近傍部におけるトンネル壁面Ｃの下端部にアンカーボルト24の一端部を水平状態で埋設、固定してこの水平アンカーボルト24を基礎コンクリートＢの天端面の上方において該天端面に平行に突設してあり、さらに、この天端面上に下端に台座25a を有する支持ボルト25を配設するように構成している。
【０００４】
そして、プレキャスト覆工部材Ａをトンネル壁面Ｃに沿って組み立ててその両側壁部の下端面に埋め込みボルト21を介して固着されている上記取付金具22の垂直固定板22b における挿通孔22d をトンネル壁面Ｃの下端部から水平に突設している上記アンカーボルト24に挿通させてナット26により固定すると共に、支持ボルト25を埋め込みボルト21の直下に対峙するように基礎コンクリートＢの天端面上に設置してこれらのボルト21、25を螺筒27で一体に連結することによりプレキャスト覆工部材Ａを埋め込みボルト21と支持ボルト25、及び、取付金具22とアンカーボルト24を介して基礎コンクリートＢとトンネル壁面Ｃとに支持させた構造としている。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記のようなプレキャスト覆工部材Ａの固定手段によれば、プレキャスト覆工部材Ａのトンネル幅方向の位置調整は水平アンカーボルト24の長さ方向に対する取付金具22の取付位置を調整することによって行うことができるが、プレキャスト覆工部材Ａの高さ調整やトンネル長さ方向の位置調整は、所定位置に固着されている水平アンカーボルト24によって予めその高さ位置やトンネル長さ方向の位置が決定されているため行うことができない。また、このような位置を微調整する機構を装備すると構造が複雑になると共に施工コストが高くなる。
【０００６】
さらに、プレキャスト覆工部材Ａに装着している取付金具22の垂直固定板22b を水平アンカーボルト24に対向させて該垂直固定板22b に設けている挿通孔22d を該水平アンカーボルト24に挿通させたり、支持ボルト25を埋め込みボルト21と同軸芯上に正確に合わせて螺筒26により連結する作業等が困難であり、施工に手間取るという問題点がある。
【０００７】
その上、プレキャスト覆工部材Ａの外周面側にはトンネル壁面Ｃに沿って防水シートＤを張設したのち、裏込め材を注入して防水処理が行われるが、トンネル壁面Ｃにはプレキャスト覆工部材Ａを支持するための上記水平アンカーボルト24が固着されているために、この水平アンカーボルト24に対向するシート部分に孔をあけなければならず、その孔部分の止水処理に非常に手間がかかるという問題点があった。
【０００８】
また、上述したように、水平アンカーボルト24と支持ボルト25とによってプレキャスト覆工部材Ａを支持するものであるから、これらの水平アンカーボルト24と支持ボルト25とに大きな荷重がかかることになり、そのため、ボルト径等を大きくしてプレキャスト覆工部材Ａを確実に支持することができる構造とする必要があり、さらに、プレキャスト覆工部材Ａにおいてもその下端部に埋め込みボルト21を埋設しなければならないので、肉厚に形成する必要があって材料費等が高くつき、不経済である等の問題点がある。
【０００９】
本発明は上記のような問題点に鑑みてなされたもので、その目的とするところは、プレキャスト覆工部材の施工作業が円滑に能率よく行えると共に正確な位置に簡単且つ確実に施工することができ、その上、防水シートの止水処理などを不要にし得るばかりでなく、構造が簡単にして且つプレキャスト覆工部材をトンネル壁面に支持させることなく基礎コンクリートの天端面上に直接的に支持させるようにしたプレキャスト覆工部材の設置構造とその施工方法を提供するにある。
【００１０】
【課題を解決するための手段】
上記目的を達成するために、本発明の請求項１に係るプレキャスト覆工部材の設置構造は、トンネル壁面に沿って配設したプレキャスト覆工部材の両側壁部の下端をトンネル内の両側基礎コンクリート上に設置するプレキャスト覆工部材の設置構造であって、上記プレキャスト覆工部材の両側壁部の外周面下端部に係止金具を装着している一方、上記基礎コンクリートの天端面における上記プレキャスト覆工部材の両側壁部の下端部設置位置に対向して該天端面上に位置決め金具を固定してあり、この位置決め金具に上記プレキャスト覆工部材の係止金具を係合させてプレキャスト覆工部材を基礎コンクリート上に設置させた構造としている。
【００１１】
さらに、このように構成したプレキャスト覆工部材の設置構造において、プレキャスト覆工部材の両側壁部の外周面下端部に装着している係止金具を両側基礎コンクリート上に固定している位置決め金具にそれぞれ該位置決め金具に接してトンネル長さ方向に移動調整可能に係止させていることを特徴とする。
【００１２】
上記請求項１に記載の発明において、請求項２に係る発明は、係止金具と位置決め金具との形状、構造に関するもので、プレキャスト覆工部材の両側壁部の外周面下端部に装着している係止金具は平面Ｕ字状の金具からなる一方、両側基礎コンクリートの天端面に固着している位置決め金具は該天端面から突設している鉄筋からなり、これらのＵ字状の係止金具と鉄筋とは、トンネル長さ方向の少なくとも２箇所に所定間隔を存して取付けられていることを特徴とする。
【００１３】
請求項３に係る発明は、上記請求項１、２に記載の発明において、平面Ｕ字状の係止金具に代えて平面Ｌ字状の係止金具を採用しているものであり、請求項４に係る発明においては、係止金具として下向きに屈曲した正面逆Ｌ字状の金具からなる一方、位置決め金具としてトンネル長さ方向に長い断面Ｌ字状の鋼板からなり、上記正面逆Ｌ字状の係止金具をプレキャスト覆工部材の両側壁部の外周面下端部における少なくとも２箇所に装着して、これらの係止金具を上記断面Ｌ字状鋼板からなる位置決め金具に係止させるように構成している。
【００１４】
さらに、請求項５に係る発明は、請求項１、４に記載の発明において、正面逆Ｌ字状の係止金具に代えてプレキャスト覆工部材の側壁下端部に、この下端部の外周面との間に隙間を存した状態で固定しているトンネル長さ方向に長い帯状鋼板からなる係止金具を採用し、この係止金具を両側基礎コンクリートの天端面に固着している断面Ｌ字状の鋼板に係止させるように構成している。
【００１５】
また、請求項６に係る発明は、プレキャスト覆工部材をトンネル壁面に沿って該トンネル内の両側基礎コンクリートの天端面間に施工する方法であって、トンネル内の両側基礎コンクリートの天端面におけるプレキャスト覆工部材の両側壁部の下端部設置位置に対向して位置決め金具を固定しておく一方、上記プレキャスト覆工部材の両側壁部の外周面下端部に上記位置決め金具に係合可能な係止金具を装着しておき、トンネル壁面に沿ってプレキャスト覆工部材を施工すると共にこのプレキャスト覆工部材の両側壁部の外周面下端部に装着している上記係止金具を上記位置決め金具に接してトンネル長さ方向に移動調整可能に係止させることによってプレキャスト覆工部材を両側基礎コンクリートの天端面上の所定位置に設置し、しかるのち、プレキャスト覆工部材をトンネル内から支保部材によって支持した状態で該プレキャスト覆工部材とトンネル壁面間に充填材を注入、固化させることを特徴とする。
【００１６】
このプレキャスト覆工部材の施工方法において、請求項７に係る発明は、プレキャスト覆工部材の高さ調整を、両側基礎コンクリートの天端面とプレキャスト覆工部材の両側壁部の下端面との間に介在させる敷鉄板又は敷モルタルの厚みの大小によって行うことを特徴としている。
【００１７】
【作用】
トンネル壁面の両側下端部の内面に所定厚みと高さを有する基礎コンクリートを打設、造成したのち、この両側の基礎コンクリートの天端面間に露出しているトンネル壁面に沿って円弧状に湾曲したプレキャスト覆工部材をトンネル周方向に組み立てると共に、このプレキャスト覆工部材の両側壁部の下端を両側の基礎コンクリートの天端面における設置位置にそれぞれ載置して両側の基礎コンクリート間にプレキャスト覆工部材を架設状態で支持させる。
【００１８】
この際、両側の基礎コンクリートの天端面上に敷鉄板又は敷モルタルを敷設してこの敷鉄板又は敷モルタル上にプレキャスト覆工部材の両側壁部の下端面を載せることにより、敷鉄板又は敷モルタルの厚みによってプレキャスト覆工部材の施工高さを調整する。
【００１９】
また、プレキャスト覆工部材の両側壁部の下端面を両側の基礎コンクリートの天端面上に載せる時に、基礎コンクリートの天端面に固着している位置決め金具にプレキャスト覆工部材の両側壁部の外周面下端部に装着している係止金具を係止させる。そうすると、上記位置決め金具は、プレキャスト覆工部材の両側壁部の下端部設置位置に対向して天端面上に固定しているため、プレキャスト覆工部材側の係止金具をこの位置決め金具に係止させるだけで、トンネルの幅方向（トンネルの周方向）に対してプレキャスト覆工部材を正確な位置に設置することができる。
【００２０】
さらに、位置決め金具に係止金具を係止させた状態で該位置決め金具に沿って係止金具をトンネル長さ方向に移動可能に構成しておくことにより、プレキャスト覆工部材をトンネル幅方向に対する移動を阻止しながらトンネル長さ方向に移動調整して先に施工したプレキャスト覆工部材の端面にその対向端面を全面的に当接させ、正確に連続させることができる。
【００２１】
このように、プレキャスト覆工部材の両側壁部を両側の基礎コンクリートの上方からそれぞれの天端面に向かって下ろすという簡単な作業によってプレキャスト覆工部材の両側壁部の外周面下端部に装着している係止金具を基礎コンクリートの天端面に固着している位置決め金具に係止させると共に、その係止によってプレキャスト覆工部材を正確な位置に設置し、且つトンネル長さ方向に対する位置調整も可能し得る係止金具と位置決め金具との好ましい形状、構造としては、請求項２に記載したように、係止金具として平面Ｕ字状の係止金具を、位置決め金具として基礎コンクリートの天端面から突設している鉄筋を採用することができる。
【００２２】
また、上記係止金具を請求項３に記載したように、平面Ｌ字状に形成しておいてもよく、この形状によれば、上記平面Ｕ字状の係止金具よりも鉄筋からなる位置決め金具に対して係止させる際の自由度が高くなると共に該位置決め金具に係止させた状態でのトンネル長さ方向の移動調整の自由度も高くなり、施工が容易となる。いずれにしても、位置決め金具に係止させる上記係止金具をプレキャスト覆工部材の外周面下端部における少なくとも２箇所に装着しておくものであって、このように構成したことにより、プレキャスト覆工部材の長さ方向を常にトンネルの長さ方向に正確に向けた状態となるように設置することができる。
【００２３】
同様に、請求項４に記載したように、係止金具を正面逆Ｌ字状に屈曲した金具から形成する一方、位置決め金具をトンネル長さ方向に長い断面Ｌ字状の鋼板から形成しておいてもよく、また、この正面逆Ｌ字状の係止金具に代えて、請求項５に記載したようにトンネル長さ方向に長い帯状鋼材から形成し、この帯状鋼材を断面Ｌ字状の鋼板からなる位置決め金具に上方より係止させるように構成しておいてもよい。
【００２４】
この場合、基礎コンクリートの天端面上に固着している位置決め金具は、トンネル長さ方向に長い断面Ｌ字状の鋼板からなるものであるから、プレキャスト覆工部材の両側壁部の外周面下端部に装着している上記正面逆Ｌ字状の係止金具、或いはトンネル長さ方向に長い帯状鋼材からなる係止金具を、プレキャスト覆工部材がその設置位置に対して長さ方向に多少変位していても、上方から位置決め金具に係止させることによってトンネル幅方向に対しては正確な位置に設置することができ、しかるのち、トンネル長さ方向に長い位置決め金具の長さ方向に係止金具を係止させた状態でプレキャスト覆工部材を移動調整することによって、先に施工したプレキャスト覆工部材に簡単且つ正確に接続させることができる。
【００２５】
こうして、プレキャスト覆工部材を両側基礎コンクリートの天端面上の所定位置に設置したのち、該プレキャスト覆工部材をトンネル内から支保部材によって支持した状態でこのプレキャスト覆工部材とトンネル壁面間に充填材を注入、固化させる。この際、トンネル壁面に沿って予め、防水シートを張設しておき、この防水シートとプレキャスト覆工部材との間の隙間に充填材を注入、固化させるものであるが、上述したように、プレキャスト覆工部材はその両側壁部の下端面を基礎コンクリートの天端面上に全面的に受止させた状態で施工されてトンネル壁面に対してはボルト等による支持などは一切行われないので、防水シートにボルト挿通孔を設ける必要はなく、施工作業を円滑にして能率よく行うことができる。
【００２６】
【発明の実施の形態】
次に、本発明の具体的な実施の形態を図面について説明する。図１〜図４において、１はトンネルＴ内の底面部における両側部に、トンネル壁面ｔの下端部に接して打設、築造された所定厚みと高さを有する基礎コンクリートで、その天端面1a、1aに、トンネル壁面ｔに沿って円弧状に施工したプレキャスト覆工部材２の両側壁部2a、2aの下端面を全面的に載置させた状態で支持している。
【００２７】
さらに、基礎コンクリート１の上記天端面1aに位置決め金具３を該天端面1aから上方に突出させた状態で固定している一方、上記プレキャスト覆工部材２の両側壁部2a、2aの外周面下端部に上記位置決め金具３に係止した係止金具４を突設している。これらの位置決め金具３と係止金具４とは、プレキャスト覆工部材２をトンネル壁面ｔに沿って施工する時に、係止金具４を位置決め金具３に係止させると、プレキャスト覆工部材２がトンネル幅方向（トンネル周方向）の所定位置に設置されるように、プレキャスト覆工部材２の両側壁部2a、2aの外周面下端部と基礎コンクリート１の天端面1a上との所定部位にそれぞれ配設、固定されている。換言すれば、係止金具４を係止させる位置決め金具３を、基礎コンクリート１の天端面1a上における上記プレキャスト覆工部材２の側壁部2aの下端面設置位置に対向して該天端面上の所定位置に固定している。
【００２８】
また、位置決め金具３に係止金具４が係止した状態においても、位置決め金具３に接して係止金具４をトンネル長さ方向に移動調整可能に構成している。なお、上記プレキャスト覆工部材２はその下端面を基礎コンクリート１の天端面1aに直接、載置してもよいが、基礎コンクリート１の天端面1aに敷鉄板又は敷モルタルからなる高さ調整部材５を敷設してこの高さ調整部材５の厚みの大小によってプレキャスト覆工部材２の設置高さを調整するようにしている。
【００２９】
上記図１〜図４に示す基礎コンクリート１の天端面1a上に固着している位置決め金具３と、プレキャスト覆工部材２の側壁部2aの外周面下端部に装着している係止金具４との具体的な形状、構造を説明すると、係止金具４は平面Ｕ字状に屈曲している金具からなり、この係止金具４をプレキャスト覆工部材２の両側壁部2a、2aの外周面下端部におけるトンネル長さ方向の前後部２箇所に突設している一方、位置決め金具３は一定長さの鉄筋からなり、この鉄筋からなる２本の位置決め金具３、３は、プレキャスト覆工部材２が両側基礎コンクリート１、１の天端面1a、1a間に架設状態で施工されてその両側壁部2a、2aの下端面が両側基礎コンクリート１、１の天端面1a、1aの所定位置に設置された時に、それぞれ対向する係止金具４、４の突出端部の内面に係止するように、天端面1a、1aの所定位置に上方に向かって突設してなるものである。
【００３０】
なお、係止金具４は、プレキャスト覆工部材２の両側壁部2a、2aの外周面下端部における前後２箇所にそれぞれ装着しているが、中間部にも装着しておいてもよく、従って、基礎コンクリート１、１の天端面1a、1aに突設している鉄筋からなる位置決め金具３においても、トンネル一スパン分のプレキャスト覆工部材２に対して前後一対の位置決め金具３を上記係止金具４、４と同一間隔を存して設けているが、係止金具４が上記のように中間部に設けている場合にはこの係止金具４に対向する位置に鉄筋からなる位置決め金具３を突設しておけばよい。
【００３１】
位置決め金具３としての上記鉄筋は、基礎コンクリート１を打設する際に配設しておいたさし鉄筋、又は、基礎コンクリート１の築造後に植設したアンカー鉄筋からなり、基礎コンクリート１の天端面1aからの突出長さは、プレキャスト覆工部材２を基礎コンクリート１の天端面1aに設置した時に、天端面1aから係止金具４までの高さよりも長く形成されている。また、平面Ｕ字状の係止金具４も、プレキャスト覆工部材２の製造時にその両端部を埋設しておくことによって、或いは、プレキャスト覆工部材２の製造後にこのプレキャスト覆工部材２の両側壁部2a、2aの外周面下端部に穿設しておいた孔にその両端部を挿入、固着することにより装着されている。
【００３２】
プレキャスト覆工部材２は、図５に示すように、上記両側壁部2a、2aを形成するトンネル周方向に長い長方形状の分割覆工部材2Aと、天壁部2bを形成するトンネル周方向に長い長方形状の分割覆工部材2Bとからなり、これらの分割覆工部材2A、2Bはトンネル長さ方向の幅が一定でトンネル壁面ｔに沿って円弧状に湾曲している。そして、施工時にはこれらの分割覆工部材2A、2Bをトンネル壁面ｔの円周方向に接続、連結して両側の基礎コンクリート１、１の天端面1a、1a間にトンネル壁面に沿ったドーム形状ないしは馬蹄形状のプレキャスト覆工部材２を組み立てる。
【００３３】
分割覆工部材2A、2Bは鉄筋コンクリート板であって、その製造時に、鉄筋の一部を図６に示すように互いに接合する端面から適宜長さだけ突出しておくと共に、この鉄筋を配設している端部に、該鉄筋を内周面に露出させた切欠部６を設けておき、組み立て時に分割覆工部材2A、2Bの端面同士を接合させた時に、切欠部６、６が一つに連続すると共にこれらの切欠部６、６内で互いの端面から突出している鉄筋が重なり合った状態となり、この鉄筋同士を溶接一体化することによって分割覆工部材2A、2Bを連結させるものである。なお、このプレキャスト覆工部材２の施工前に、トンネル壁面ｔに接して防水シート７が全面的に張設して地下水がトンネル内に浸入するのを防止している。
【００３４】
このようにトンネルＴの壁面ｔに沿ってプレキャスト覆工部材２を組み立てると共に、その両側壁部2a、2aの下端面を両側の基礎コンクリート１、１の天端面1a、1a上に載せて設置、固定することにより、プレキャスト覆工部材２を施工するものであるが、この際、プレキャスト覆工部材２の両側壁部2a、2aの外周面下端部に装着している平面Ｕ字状の係止金具４を両側の基礎コンクリート１、１の天端面1a、1a上に突設している鉄筋からなる位置決め金具３に係止させることによって該プレキャスト覆工部材２を所定位置に設置する。
【００３５】
詳しくは、プレキャスト覆工部材２の施工時において、該プレキャスト覆工部材２の側壁部2aの下端面を基礎コンクリート１の天端面1aの上方に対向させた状態から下ろしながらその側壁部2aの外周面下端部に装着している前後係止金具４、４を基礎コンクリート１の天端面1aに前後に上記平面Ｕ字状の係止金具４、４間と同一間隔を存して突設している位置決め金具３、３上に合致させて係止金具４、４内にこれらの前後位置決め金具３、３を挿入、係止させ、この状態にしてプレキャスト覆工部材２の側壁部2aの下端面を高さ調整部材５を介して基礎コンクリート１の天端面1a上に設置する。
【００３６】
この際、プレキャスト覆工部材２の両側壁部2a、2aを同時に両側の基礎コンクリート１、１の天端面1a、1a上にそれぞれ設置させてもよく、一方の側壁部2aを一方の基礎コンクリート１の天端面1a上に設置したのち、他方の側壁部2aを他方の基礎コンクリート１の天端面1a上に設置してもよい。
【００３７】
こうして、プレキャスト覆工部材２の両側壁部2a、2aを両側の基礎コンクリート１、１の天端面1a、1a上に設置すると、その前後係止金具４、４の突出先端部の内面に鉄筋からなる位置決め金具３が係止し、プレキャスト覆工部材２がトンネルＴの幅方向（トンネル周方向）に対して所定の位置にトンネル長さ方向に正確に向いた状態で設置される。
【００３８】
さらに、この状態においては、位置決め金具３と係止金具４とは、この係止金具４内の前後方向の空間幅、即ち、平面Ｕ字状に形成されている該係止金具４の前後の脚杆部間の幅間隔に相当する距離だけトンネル長さ方向に相対的に移動可能であるから、プレキャスト覆工部材２全体をトンネル長さ方向に移動調整して先に施工したプレキャスト覆工部材２の円弧状に湾曲した端面にこのプレキャスト覆工部材２の対向端面を当接させて一体に連結する。
【００３９】
しかるのち、このプレキャスト覆工部材２の内周面をトンネルＴ内に組み立てた支保部材（図示せず）によって支持させた状態にしてトンネル壁面ｔに接して張設している防水シート７と該プレキャスト覆工部材２の外周面間の空間部にモルタル等の充填材を注入、固化させることにより、一スパン分のプレキャスト覆工部材２の施工が完了し、このプレキャスト覆工部材２を順次、トンネル長さ方向に施工してトンネルを全面的に覆工するものである。
【００４０】
上記実施の形態においては、基礎コンクリート１の天端面1a上の所定位置にプレキャスト覆工部材２を位置決めして設置するための位置決め金具３としてさし鉄筋やアンカー鉄筋等の鉄筋からなり、係止金具４を平面Ｕ字状に屈曲形成した金具から構成しているが、本発明はこのような位置決め金具３と係止金具４の形状、構造に限らず、次に、述べるような位置決め金具と係止金具とを採用してもよい。
【００４１】
図７〜図10はその一つの実施の形態を示すもので、基礎コンクリート１の天端面1a上に立設している位置決め金具3Aとしては、上記実施の形態で述べたさし鉄筋又はアンカー鉄筋等の鉄筋からなるものであるが、係止金具4Aとしては上記平面Ｕ字状の係止金具４に代えて、１本の脚杆部4A1 の先端にトンネル長さ方向に後方に向かって、即ち、既に施工したプレキャスト覆工部材２側に向かって直角に屈折している先端杆部4A2 を設けてなる平面Ｌ字状の係止金具を用いている。なお、先端杆部4A2 の長さは上記平面Ｕ字状の係止金具４の前後脚杆部間の幅よりも長く形成されている。
【００４２】
基礎コンクリート１の天端面1aとプレキャスト覆工部材２の側壁部2aの外周面下部に対するこれらの位置決め金具3Aと係止金具4Aとの取付け位置等は上記実施の形態と同様である。即ち、これらの位置決め金具3Aと係止金具4Aとはトンネル長さ方向の少なくとも２箇所にトンネル方向（前後方向）に所定間隔を存し、且つ、互いに係止させた時にプレキャスト覆工部材２を基礎コンクリート１の天端面1aの所定位置に設置させる位置に配設されている。
【００４３】
このように構成したので、プレキャスト覆工部材２の両側壁部2a、2aの下端面を両側の基礎コンクリート１、１の天端面1a、1aの上方にそれぞれ対向させた状態から下ろしながらその側壁部2aの外周面下端部に装着している平面Ｌ字状の前後係止金具4A、4Aを基礎コンクリート１の天端面1aに前後に上記係止金具4A、4A間と同一間隔を存して突設している位置決め金具3A、3A上に合致させて係止金具4A、4Aの先端部内にこれらの前後位置決め金具3A、3Aを挿入、係止させ、この状態にしてプレキャスト覆工部材２の両側壁部2a、2aの下端面を両側の基礎コンクリート１、１の天端面1a、1a上に高さ調整部材５を介して設置する。
【００４４】
そうすると、位置決め金具3A、3Aと係止金具4A、4Aとの係止によってプレキャスト覆工部材２はトンネルＴの幅方向（トンネル周方向）に対して所定の位置にトンネル長さ方向に正確に向いた状態で設置され、この状態から係止金具4A、4Aにおけるトンネル長さ方向に屈折した先端部を位置決め金具3A、3Aに摺接させながらプレキャスト覆工部材２をトンネル長さ方向に移動させてその円弧状に湾曲している後端面を先に施工したプレキャスト覆工部材２との円弧状に湾曲している前端面に当接させ、一体に連結させるものである。
【００４５】
この際、係止金具4Aはその先端杆部4A2 が先に施工したプレキャスト覆工部材２側に向かって屈折している平面Ｌ字状に形成しているので、プレキャスト覆工部材２の施工時には、該係止金具4Aを位置決め金具3Aの垂直上方に対向させることなく、プレキャスト覆工部材２を先に施工したプレキャスト覆工部材２から前方に比較的広い間隔を存した天端面1a上に一旦載せて、該係止金具4Aを位置決め金具3Aの前方に対峙させた状態にしたのち、プレキャスト覆工部材２を後方に移動させて該係止金具4Aを位置決め金具3Aに係止させることができ、さらに、係止後においても、係止金具4Aのトンネル長さ方向の移動調整範囲も長くなるので、狭いトンネル内における施工の自由度が高くなってプレキャスト覆工部材２を容易に且つ確実に所定位置に施工することができる。
【００４６】
図11〜図13は上記位置決め金具と係止金具との別な実施の形態を示すもので、基礎コンクリート１の天端面1a上に立設している位置決め金具3Bとしては、横長長方形状の鋼板を断面Ｌ字状に折り曲げてなり、この断面Ｌ字状の位置決め金具3Bを基礎コンクリート１の天端面1aにおけるプレキャスト覆工部材２の設置位置に対向させてその水平帯板部3B1 を天端面1a上にトンネル長さ方向に平行に固着し、垂直帯板部3B2 を上方に突設させている一方、係止金具4Bは、一定長さの脚杆部4B1 の先端に、上記位置決め金具3Bの垂直帯板部3B2 に係止させる垂直幹部4B2 を下方に向かって略直角に屈折、形成してなるもので、この係止金具4Bを少なくともプレキャスト覆工部材２の両側壁部2a、2aの外周面下端部における少なくとも前後２箇所に配設してその脚杆部4B1 の端部を側壁部2aに固着してなるものである。
【００４７】
このように構成したので、上記同様に、プレキャスト覆工部材２を両側の基礎コンクリート１、１の天端面1a、1a上に設置する際に、プレキャスト覆工部材２の両側壁部2a、2aを天端面1a上に下ろすことによってその前後係止金具4B、4Bを位置決め金具3Bの垂直帯板部3B2 に係止させ、プレキャスト覆工部材２を所定の位置に設置するものであるが、この際、垂直帯板部3B2 はトンネル長さ方向に連続しているので、プレキャスト覆工部材２を先に施工したプレキャスト覆工部材２から前方に適当な間隔だけ離間させた状態で下ろしてもその前後係止金具4B、4Bを該垂直帯板部3B2 に係止させることができ、この状態にして係止金具4Bを位置決め金具3Bに係止させながらプレキャスト覆工部材２を後方に移動させることにより、先に施工したプレキャスト覆工部材２と接続させることができるので、施工の自由度が高くなってプレキャスト覆工部材２を容易に且つ確実に所定位置に施工することができるものである。なお、天端面1a上に高さ調整部材５を敷設する等のその他の構成については上記実施の形態と同様である。
【００４８】
図14〜図16は上記位置決め金具と係止金具とのさらに別な実施の形態を示すもので、基礎コンクリート１の天端面1a上に立設している位置決め金具3Cとしては、上記図11〜図13で示した位置決め金具3Bと同じ形状、構造であって天端面1aに対する装着位置も同じであるが、係止金具4Cとしては、トンネル長さ方向に長い帯状鋼板からなり、この係止金具4Cをプレキャスト覆工部材２の両側壁部2a、2aの外周面下端部にトンネル長さ方向に配設し、その前後両端部をボルト８、８によって側壁部2aの下端前後部に固着して該係止金具4Cと側壁部2aの下端部外周面との間に一定の隙間を設けて係止金具4Cを上記位置決め金具3Cに係止させるように構成している。
【００４９】
このように構成したので、プレキャスト覆工部材２を両側の基礎コンクリート１、１の天端面1a、1a上に設置する際に、該プレキャスト覆工部材２の両側壁部2a、2aの外周面下端部に装着している帯状鋼板からなる上記係止金具4Cを天端面1a、1a上の上記位置決め金具3Cに上方から係止させて所定の位置に設置させるものであるが、この際、位置決め金具3Cと係止金具4Cとは共に、トンネル長さ方向に長い帯状鋼板からなるので、上記実施の形態と同様に、プレキャスト覆工部材２を先に施工したプレキャスト覆工部材２から前方に適当な間隔だけ離間させた状態で下ろしてもその係止金具4Cを位置決め金具3Cの適所に確実に係止させることができ、この状態にして係止金具4Cを位置決め金具3Cに摺接させながらプレキャスト覆工部材２を後方に移動させることにより、先に施工したプレキャスト覆工部材２と接続させることができるので、施工の自由度が高くなってプレキャスト覆工部材２を容易に且つ確実に所定位置に施工することができるものである。なお、天端面1a上に高さ調整部材５を敷設する等のその他の構成については上記実施の形態と同様である。
【００５０】
【発明の効果】
以上のように本発明の請求項１に係るプレキャスト覆工部材野設置構造によれば、プレキャスト覆工部材の両側壁部の外周面下端部に係止金具を装着する一方、基礎コンクリートの天端面における上記プレキャスト覆工部材の両側壁部の下端部設置位置に対向して該天端面上に位置決め金具を固定し、この位置決め金具に上記プレキャスト覆工部材の係止金具を係合させてプレキャスト覆工部材を基礎コンクリート上に設置させた構造としているので、プレキャスト覆工部材の両側壁部を天端面上に設置する際に、その両側壁部の外周面下端部に装着した係止金具を天端面上に固定した位置決め金具に上方から係止させるだけでプレキャスト覆工部材をトンネル幅方向に対して正確な位置に簡単に設置することができると共に、プレキャスト覆工部材の下端面を全面的に基礎コンクリートの天端面上に支持させた構造とするので、設置構造が簡素であるにもかかわらず、プレキャスト覆工部材を確実且つ強固に設置した構造とすることができる。
【００５１】
さらに、プレキャスト覆工部材を基礎コンクリートの天端面上に設置する際に、該天端面とプレキャスト覆工部材の下端面との間に敷鉄板又は敷モルタルを敷設することによって、プレキャスト覆工部材の設置高さを正確に調整することができ、その上、トンネル壁面にはプレキャスト覆工部材を支持するボルト等の金具などは一切、付設していないので、該トンネル壁面に張設する防水シートにはボルト挿通孔を設けることもなく、従って、その挿通孔に対する止水処理などが不要となり、プレキャスト覆工部材を簡単にして能率よく施工することができるものである。
【００５２】
その上、このプレキャスト覆工部材の設置構造において、プレキャスト覆工部材の両側壁部の外周面下端部に装着している上記係止金具を両側基礎コンクリート上に固定している上記位置決め金具にそれぞれ該位置決め金具に接してトンネル長さ方向に移動調整可能に係止させているので、基礎コンクリートの天端面上にプレキャスト覆工部材を設置する際に、該プレキャスト覆工部材を既に設置しているプレキャスト覆工部材の前端から前方に設置作業が容易に行える間隔を存した状態で設置することができ、しかるのち、係止金具を位置決め金具に摺接させながらこのプレキャスト覆工部材を後方に移動させて先に施工した上記プレキャスト覆工部材に簡単且つ正確に接続させることができる。
【００５３】
上記係止金具と位置決め金具との形状、構造として、請求項２に係る発明は、係止金具を平面Ｕ字状に形成している一方、位置決め金具を該天端面から突設している鉄筋から形成し、さらに、これらのＵ字状の係止金具と鉄筋とを、プレキャスト覆工部材の外周面下端部と基礎コンクリートの天端面上におけるトンネル長さ方向の少なくとも２箇所に所定間隔を存してそれぞれ配設しているので、プレキャスト覆工部材の設置時に、平面Ｕ字状の係止金具を鉄筋からなる位置決め金具に合わせて上方から被せるように係合させるだけで、容易に且つ自動的に正確な位置に設置させることができると共に係止金具と位置決め金具とはそれぞれ前後に一対ずつ設けられているので、プレキャスト覆工部材をトンネル長さ方向に対しても正確に向けた状態で設置することができ、また、平面Ｕ字状の係止金具における先端部の前後方向の長さに相当する距離だけ、プレキャスト覆工部材の前後方向の微調整が可能となる。
【００５４】
一方、請求項３に係る発明によれば、上記請求項２に記載の発明において、係止金具を平面Ｌ字状に形成しているので、鉄筋からなる位置決め金具に対して該係止金具を前後方向からも係止させることができ、従って、プレキャスト覆工部材の施工時における自由度が高くなると共に前後方向の移動調整の自由度も増大して施工が容易となるものである。
【００５５】
同様に、請求項４に記載したように、係止金具を正面逆Ｌ字状に屈曲した金具から形成する一方、位置決め金具をトンネル長さ方向に長い断面Ｌ字状の鋼板から形成しておいてもよく、また、この正面逆Ｌ字状の係止金具に代えて、請求項５に記載したようにトンネル長さ方向に長い帯状鋼材から形成し、この帯状鋼材を断面Ｌ字状の鋼板からなる位置決め金具に上方より係止させるように構成しておいてもよい。
【００５６】
この場合、基礎コンクリートの天端面上に固着している位置決め金具は、トンネル長さ方向に長い断面Ｌ字状の鋼板からなるものであるから、プレキャスト覆工部材の両側壁部の外周面下端部に装着している上記正面逆Ｌ字状の係止金具、或いはトンネル長さ方向に長い帯状鋼材からなる係止金具を、プレキャスト覆工部材がその設置位置に対して長さ方向に多少変位していても、上方から位置決め金具に係止させることによってトンネル幅方向に対しては正確な位置に設置することができ、しかるのち、トンネル長さ方向に長い位置決め金具の長さ方向に係止金具を係止させた状態でプレキャスト覆工部材を移動調整することによって、先に施工したプレキャスト覆工部材に簡単且つ正確に接続させることができる。
【図面の簡単な説明】
【図１】基礎コンクリート上にプレキャスト覆工部材を設置した状態の一部斜視図。
【図２】その簡略縦断正面図。
【図３】側面図。
【図４】横断面図。
【図５】プレキャスト覆工部材の簡略正面図。
【図６】分割覆工部材の対向端面同士を連結した状態の内面側から見た平面図。
【図７】プレキャスト覆工部材の別な設置構造を示す一部斜視図。
【図８】その簡略縦断正面図。
【図９】側面図。
【図１０】横断面図。
【図１１】プレキャスト覆工部材の更に別な設置構造を示す一部斜視図。
【図１２】その簡略縦断正面図。
【図１３】側面図。
【図１４】プレキャスト覆工部材の更に別な設置構造を示す一部斜視図。
【図１５】その簡略縦断正面図。
【図１６】側面図。
【図１７】従来例を示す要部の縦断正面図。
【符号の説明】
１基礎コンクリート
1a 天端面
２プレキャスト覆工部材
2a 側壁部
３位置決め金具
４係止金具
５高さ調整部材
７防水シート
ｔトンネル壁面[0001]
BACKGROUND OF THE INVENTION
The present invention provides an installation structure in which lower ends of both side walls of a precast lining member are installed at accurate positions on both side foundation concrete in the tunnel when the tunnel wall surface is covered with a precast lining member, and the precast It is related with the construction method of a lining member.
[0002]
[Prior art]
When precast lining members are constructed on the tunnel wall of a new tunnel, or when precast lining members are constructed on a tunnel wall for the purpose of repairing, widening, reinforcing, etc. in existing tunnels, The lower ends of both side walls of the precast lining member assembled in this way are supported on both sides of the concrete foundation on both sides and both ends of the tunnel wall.
[0003]
That is, as shown in FIG. 17, the upper end portion of the embedded bolt 21 is embedded and fixed to the lower end portion of the precast lining member A, and the embedded bolt 21 is protruded vertically downward from the lower end surface of the precast lining member A. At the same time, a mounting plate 22a and a mounting bracket 22 formed by integrally fixing a vertical fixing plate 22b to the outer end surface of the horizontal fixing plate 22a are used, and mounting holes provided in the horizontal fixing plate 22a of the mounting bracket 22 are used. 22c is inserted into the embedded bolt 21 and fixed with a nut 23 in a state where the upper surface of the horizontal fixing plate 22a is in contact with the lower end surface of the precast lining member A, while the tunnel in the vicinity of the top end surface of the foundation concrete B One end of the anchor bolt 24 is embedded and fixed in the lower end of the wall C in a horizontal state, and this horizontal anchor bolt 24 is projected above the top end surface of the foundation concrete B in parallel to the top end surface. To, and configured to dispose the supporting bolt 25 having a base 25a at the lower end on the top end face.
[0004]
Then, the precast lining member A is assembled along the tunnel wall surface C, and the insertion hole 22d in the vertical fixing plate 22b of the mounting bracket 22 fixed to the lower end surface of the both side walls via the embedded bolts 21 is formed in the tunnel wall surface. The anchor bolt 24 that protrudes horizontally from the lower end of C is inserted through the anchor bolt 24 and fixed by the nut 26, and the support bolt 25 is installed on the top end surface of the foundation concrete B so as to face directly below the embedded bolt 21. By connecting these bolts 21 and 25 together with a screw cylinder 27, the precast lining member A is embedded into the foundation concrete B and the tunnel through the embedded bolt 21 and the support bolt 25, and the mounting bracket 22 and the anchor bolt 24. The structure is supported by the wall surface C.
[0005]
[Problems to be solved by the invention]
However, according to the fixing means of the precast lining member A as described above, the position adjustment of the precast lining member A in the tunnel width direction is to adjust the mounting position of the mounting bracket 22 with respect to the length direction of the horizontal anchor bolt 24. However, the height adjustment of the precast lining member A and the position adjustment in the tunnel length direction can be performed in advance by the horizontal anchor bolt 24 fixed at a predetermined position. Can not be done because has been determined. Further, when a mechanism for finely adjusting such a position is provided, the structure becomes complicated and the construction cost increases.
[0006]
Further, the vertical fixing plate 22b of the mounting bracket 22 attached to the precast lining member A is opposed to the horizontal anchor bolt 24, and the insertion hole 22d provided in the vertical fixing plate 22b is inserted into the horizontal anchor bolt 24. In other words, it is difficult to accurately align the support bolt 25 with the embedded bolt 21 on the coaxial core and to connect the support bolt 25 with the screw cylinder 26.
[0007]
In addition, a waterproof sheet D is stretched along the tunnel wall surface C on the outer peripheral surface side of the precast lining member A, and then waterproofing is performed by injecting a backfill material. Since the horizontal anchor bolt 24 for supporting the work member A is fixed, it is necessary to make a hole in the sheet portion facing the horizontal anchor bolt 24, which is very effective for water stop treatment of the hole portion. There was a problem that it took time and effort.
[0008]
Further, as described above, since the precast lining member A is supported by the horizontal anchor bolt 24 and the support bolt 25, a large load is applied to the horizontal anchor bolt 24 and the support bolt 25, For this reason, it is necessary to increase the bolt diameter and the like so that the precast lining member A can be reliably supported. Further, in the precast lining member A, the embedded bolt 21 must be embedded at the lower end portion thereof. Therefore, there is a problem that it is necessary to form a thick wall, which increases the material cost and is uneconomic.
[0009]
The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to perform the construction work of the precast lining member smoothly and efficiently and to construct the precise position easily and reliably. Moreover, not only can the waterproofing treatment of the waterproof sheet be made unnecessary, but also the structure is simplified and the precast lining member is directly supported on the top end surface of the foundation concrete without being supported on the tunnel wall surface. It is in providing the installation structure and construction method of the precast lining member which were made.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the precast lining member installation structure according to claim 1 of the present invention is such that the lower ends of both side wall portions of the precast lining member arranged along the tunnel wall surface are provided on both side foundation concrete in the tunnel. An installation structure of a precast lining member to be installed on the precast lining member, wherein a locking metal fitting is attached to the lower end of the outer peripheral surface of each side wall of the precast lining member, while the precast covering on the top end surface of the foundation concrete is provided. A positioning bracket is fixed on the top end face opposite to the lower end installation positions of both side wall portions of the work member, and the locking member of the precast lining member is engaged with the positioning bracket, and the precast lining member Is constructed on the foundation concrete.
[0011]
further, In the installation structure of the precast lining member configured in this way Precast lining material The locking brackets attached to the lower end of the outer peripheral surface of both side walls of the two sides are fixed to the positioning brackets fixed on the foundation concrete on both sides in contact with the positioning brackets so as to be movable and adjustable in the tunnel length direction. It is characterized by being.
[0012]
the above Claim 1 In the described invention, the claim 2 The invention according to the invention relates to the shape and structure of the locking metal fitting and the positioning metal fitting, and the locking metal fitting attached to the lower end of the outer peripheral surface of the both side walls of the precast lining member is a flat U-shaped metal fitting. On the other hand, the positioning brackets fixed to the top end surfaces of the both side foundation concrete are made of reinforcing bars protruding from the top end surfaces, and these U-shaped locking brackets and reinforcing bars are at least 2 in the tunnel length direction. It is characterized in that it is attached to the place with a predetermined interval.
[0013]
Claim 3 The invention according to claim 1 1, 2 In the invention described in claim 1, a flat L-shaped locking bracket is adopted instead of the flat U-shaped locking bracket, 4 In the invention according to the present invention, it is composed of a front inverted L-shaped metal fitting bent downward as a locking metal fitting, and a positioning metal fitting made of a steel plate having an L-shaped cross section that is long in the tunnel length direction. The locking brackets are attached to at least two places on the lower end of the outer peripheral surface of the both side walls of the precast lining member, and these locking brackets are configured to be locked to the positioning brackets made of the L-shaped cross-section steel plates. ing.
[0014]
Further, the invention according to claim 5 is the claim. 1, 4 In the invention described in the above, the tunnel length is fixed to the lower end portion of the side wall of the precast lining member in place of the front inverted L-shaped locking bracket with a gap between the outer peripheral surface of the lower end portion. A locking bracket made of a strip-shaped steel plate that is long in the vertical direction is adopted, and the locking bracket is configured to be locked to a steel plate having an L-shaped cross section that is fixed to the top end surfaces of both side foundation concrete.
[0015]
Claims 6 The present invention relates to a method of constructing a precast lining member along the tunnel wall surface between the top end surfaces of both side foundation concrete in the tunnel, the both sides of the precast lining member on the top end surfaces of the both side foundation concrete in the tunnel. While fixing the positioning bracket facing the lower end installation position of the wall, attach a locking bracket that can be engaged with the positioning bracket to the lower end of the outer peripheral surface of both side walls of the precast lining member. In addition, the precast lining member is constructed along the tunnel wall surface and is attached to the lower end of the outer peripheral surface of both side walls of the precast lining member. the above Locking bracket the above For positioning bracket Adjustable to move in the tunnel length direction. By locking, the precast lining member is installed at a predetermined position on the top end surfaces of the both side foundation concrete, and then the precast lining member and the tunnel wall surface are supported by the supporting member from inside the tunnel. It is characterized by injecting and solidifying a filler in between.
[0016]
In the construction method of this precast lining member, claim 7 In the invention according to the present invention, the height adjustment of the precast lining member is performed between the top end surface of the foundation concrete on both sides and the lower end surfaces of the side wall portions of the precast lining member, depending on the thickness of the laying iron plate or mortar. To do It is characterized by.
[0017]
[Action]
After foundation concrete having a predetermined thickness and height was cast on the inner surface of the lower end of both sides of the tunnel wall, it was curved in an arc along the tunnel wall exposed between the top end surfaces of the foundation concrete on both sides. The precast lining member is assembled in the circumferential direction of the tunnel, and the lower ends of both side walls of the precast lining member are respectively placed on the installation positions on the top end surfaces of the foundation concrete on both sides, and the precast lining member is placed between the foundation concrete on both sides. Is supported in the erected state.
[0018]
At this time, by laying a laid iron plate or mortar on the top end surface of the foundation concrete on both sides and placing the lower end surfaces of both side walls of the precast lining member on this laid iron plate or laid mortar, the laid iron plate or laid mortar The construction height of the precast lining member is adjusted according to the thickness of the.
[0019]
In addition, when the lower end surfaces of both side walls of the precast lining member are placed on the top end surfaces of the foundation concrete on both sides, the outer peripheral surfaces of the both side walls of the precast lining member are attached to the positioning brackets fixed to the top end surfaces of the foundation concrete. The locking bracket attached to the lower end is locked. Then, since the positioning bracket is fixed on the top end surface so as to face the lower end installation positions of the both side walls of the precast lining member, the locking bracket on the precast lining member side is locked to the positioning bracket. The precast lining member can be installed at an accurate position with respect to the tunnel width direction (tunnel circumferential direction).
[0020]
In addition, the precast lining member can be moved in the tunnel width direction by configuring the locking bracket to be movable in the tunnel length direction along the positioning bracket while the locking bracket is locked to the positioning bracket. It is possible to make the opposite end face come into full contact with the end face of the precast lining member that has been previously constructed by adjusting the movement in the tunnel length direction while preventing this, and to continue accurately.
[0021]
As described above, the both side walls of the precast lining member are attached to the lower end portions of the outer peripheral surfaces of the both side walls of the precast lining member by a simple operation of lowering the foundation concrete on both sides toward the top end surfaces. The locking bracket is locked to the positioning bracket that is fixed to the top end surface of the foundation concrete, and by this locking, the precast lining member is placed at an accurate position and the position in the tunnel length direction can be adjusted. As a preferable shape and structure of the obtained locking metal fitting and positioning metal fitting, 2 As described above, a flat U-shaped locking bracket can be used as the locking bracket, and a reinforcing bar protruding from the top end surface of the foundation concrete can be used as the positioning bracket.
[0022]
Further, the locking bracket is claimed. 3 As described in the above, it may be formed in a plane L shape, and according to this shape, the freedom in locking with respect to the positioning bracket made of a rebar rather than the plane U-shaped locking bracket. The degree of freedom increases, and the degree of freedom of movement adjustment in the tunnel length direction in the state of being locked to the positioning metal fittings increases, and the construction becomes easy. In any case, the locking metal fitting to be locked to the positioning metal fitting is attached to at least two places on the lower end portion of the outer peripheral surface of the precast lining member. It can be installed so that the length direction of the member is always accurately oriented in the length direction of the tunnel.
[0023]
Similarly, the claims 4 As described above, the locking bracket may be formed from a bracket bent in a front inverted L shape, while the positioning bracket may be formed from a steel plate having an L-shaped cross section that is long in the tunnel length direction. Instead of the front inverted L-shaped locking bracket, 5 It may be formed from a strip-shaped steel material that is long in the tunnel length direction as described above, and this strip-shaped steel material may be configured to be locked from above by a positioning bracket made of a steel plate having an L-shaped cross section.
[0024]
In this case, since the positioning bracket fixed on the top end surface of the foundation concrete is made of a steel plate having an L-shaped cross section that is long in the tunnel length direction, the lower end portion of the outer peripheral surface of both side walls of the precast lining member The pre-cast lining member is slightly displaced in the length direction with respect to the installation position of the front inverted L-shaped locking bracket attached to the above or the locking bracket made of a strip-shaped steel material that is long in the tunnel length direction. Even if it is locked to the positioning bracket from above, it can be installed at an accurate position in the tunnel width direction, and then the locking bracket in the length direction of the positioning bracket that is long in the tunnel length direction. By moving and adjusting the precast lining member in a state of being locked, it is possible to easily and accurately connect to the precast lining member previously constructed.
[0025]
Thus, after the precast lining member is installed at a predetermined position on the top end surface of the both-side foundation concrete, the filler is interposed between the precast lining member and the tunnel wall surface in a state where the precast lining member is supported by the support member from inside the tunnel. Inject and solidify. At this time, a waterproof sheet is stretched in advance along the tunnel wall surface, and the filler is injected into the gap between the waterproof sheet and the precast lining member, and is solidified. Since the precast lining member is constructed with the lower end surfaces of both side walls received entirely on the top end surface of the foundation concrete, it is not supported at all by bolts etc. on the tunnel wall surface, It is not necessary to provide a bolt insertion hole in the waterproof sheet, and the construction work can be performed smoothly and efficiently.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the present invention will be described with reference to the drawings. 1 to 4, reference numeral 1 denotes foundation concrete having a predetermined thickness and height, which is placed and constructed on both sides of the bottom surface of the tunnel T in contact with the lower end of the tunnel wall surface t. , 1a is supported in a state in which the lower end surfaces of both side walls 2a, 2a of the precast lining member 2 constructed in an arc shape along the tunnel wall surface t are placed on the entire surface.
[0027]
Further, the positioning bracket 3 is fixed to the top end surface 1a of the foundation concrete 1 in a state of protruding upward from the top end surface 1a, while the lower end of the outer peripheral surface of both side walls 2a, 2a of the precast lining member 2 is fixed. A locking metal fitting 4 that is locked to the positioning metal fitting 3 is projected from the portion. These positioning metal fittings 3 and the locking metal fittings 4 are configured such that when the precast lining member 2 is constructed along the tunnel wall surface t and the locking metal fitting 4 is locked to the positioning metal fitting 3, the precast lining member 2 is tunneled. Arranged at predetermined positions on the lower end of the outer peripheral surface of both side walls 2a and 2a of the precast lining member 2 and on the top end surface 1a of the foundation concrete 1 so as to be installed at predetermined positions in the width direction (tunnel circumferential direction). It is fixed. In other words, the positioning bracket 3 for locking the locking bracket 4 is placed on the top end surface opposite to the position of the lower end surface of the side wall portion 2a of the precast lining member 2 on the top end surface 1a of the foundation concrete 1. It is fixed in place.
[0028]
Further, even when the locking metal fitting 4 is locked to the positioning metal fitting 3, the locking metal fitting 4 can be moved and adjusted in the tunnel length direction in contact with the positioning metal fitting 3. The above-mentioned precast lining member 2 may have its lower end surface mounted directly on the top end surface 1a of the foundation concrete 1, but the height adjusting member made of a laid iron plate or a mortar on the top end surface 1a of the foundation concrete 1 5 is installed, and the installation height of the precast lining member 2 is adjusted according to the thickness of the height adjusting member 5.
[0029]
1 to 4, the positioning metal fitting 3 fixed on the top end surface 1a of the foundation concrete 1, and the locking metal fitting 4 attached to the lower end of the outer peripheral surface of the side wall 2a of the precast lining member 2; The specific shape and structure will be described. The locking metal fitting 4 is formed of a metal bent in a plane U shape, and this locking metal fitting 4 is connected to the outer peripheral surfaces of the side walls 2a and 2a of the precast lining member 2. While projecting at two locations in the tunnel length direction at the lower end, the positioning bracket 3 is composed of a certain length of reinforcing bar, and the two positioning brackets 3, 3 composed of this reinforcing bar are precast lining members. 2 is constructed between the top end faces 1a and 1a of the two-sided foundation concrete 1, 1 and the lower end surfaces of both side walls 2a and 2a are installed at the predetermined positions on the top end faces 1a and 1a of the two-side foundation concrete 1, 1. Projecting end portions of the locking metal fittings 4 and 4 that face each other when To lock the inner surface is made to protrude crest surface 1a, in a predetermined position 1a upward.
[0030]
The locking metal fittings 4 are attached to the front and rear two places on the lower end of the outer peripheral surface of the both side walls 2a and 2a of the precast lining member 2, but may also be attached to the middle part. In the positioning metal fittings 3 made of reinforcing bars protruding from the top end surfaces 1a and 1a of the foundation concrete 1 and 1, the pair of front and rear positioning metal fittings 3 are locked to the precast lining member 2 for one span of the tunnel. The metal fittings 4 and 4 are provided at the same interval. However, when the locking metal fitting 4 is provided at the intermediate portion as described above, the positioning metal fitting 3 made of a reinforcing bar is provided at a position facing the metal fitting 4. Should be provided.
[0031]
The rebar as the positioning metal fitting 3 is composed of a reinforcing bar arranged at the time of placing the foundation concrete 1 or an anchor rebar planted after the foundation concrete 1 is constructed. The protruding length from 1a is formed longer than the height from the top end surface 1a to the locking metal fitting 4 when the precast lining member 2 is installed on the top end surface 1a of the basic concrete 1. Further, the flat U-shaped locking metal fitting 4 is also formed by embedding both ends of the precast lining member 2 at the time of manufacturing the precast lining member 2 or after the precast lining member 2 is manufactured. The wall portions 2a and 2a are mounted by inserting and fixing both end portions thereof into holes formed in the lower end portions of the outer peripheral surfaces of the wall portions 2a and 2a.
[0032]
As shown in FIG. 5, the precast lining member 2 includes a rectangular divided lining member 2A that is long in the tunnel circumferential direction that forms the side walls 2a and 2a, and a tunnel circumferential direction that forms the top wall 2b. The divided lining member 2B has a long rectangular shape, and these divided lining members 2A and 2B have a constant width in the tunnel length direction and are curved in an arc shape along the tunnel wall surface t. At the time of construction, these divided lining members 2A and 2B are connected and connected in the circumferential direction of the tunnel wall t to form a dome shape or along the tunnel wall between the top end surfaces 1a and 1a of the foundation concrete 1 and 1 on both sides. A horseshoe-shaped precast lining member 2 is assembled.
[0033]
The divided lining members 2A and 2B are reinforced concrete plates, and at the time of production thereof, a part of the reinforcing bars protrude from the end surfaces joined to each other as shown in FIG. 6, and the reinforcing bars are disposed. A notch 6 is provided at the end where the reinforcing bar is exposed on the inner peripheral surface, and when the end faces of the divided lining members 2A and 2B are joined at the time of assembly, the notches 6 and 6 become one. Reinforcing bars that are continuous and project from the end surfaces of these notches 6 and 6 are overlapped with each other, and the reinforcing members 2A and 2B are connected by welding these reinforcing bars together. In addition, before the construction of the precast lining member 2, the waterproof sheet 7 is stretched over the entire surface in contact with the tunnel wall surface t to prevent the underground water from entering the tunnel.
[0034]
In this way, the precast lining member 2 is assembled along the wall surface t of the tunnel T, and the lower end surfaces of both side walls 2a, 2a are placed on the top end surfaces 1a, 1a of the foundation concrete 1, 1 on both sides, By fixing, the precast lining member 2 is constructed. At this time, the plane U-shaped locking attached to the lower end portions of the outer peripheral surfaces of both side walls 2a, 2a of the precast lining member 2 The precast lining member 2 is installed at a predetermined position by engaging the metal fittings 4 with positioning metal fittings 3 made of reinforcing bars protruding on the top end faces 1a, 1a of the foundation concretes 1, 1 on both sides.
[0035]
Specifically, when the precast lining member 2 is constructed, the outer periphery of the side wall portion 2a is lowered while lowering the lower end surface of the side wall portion 2a of the precast lining member 2 above the top end surface 1a of the foundation concrete 1. The front and rear locking metal fittings 4 and 4 attached to the lower end of the surface are projected on the top end surface 1a of the foundation concrete 1 in the front and rear directions with the same spacing as the space between the flat U-shaped metal fittings 4 and 4 above. The front and rear positioning metal fittings 3 and 3 are inserted into and locked in the locking metal fittings 4 and 4 in alignment with the positioning metal fittings 3 and 3, and in this state, the lower end surface of the side wall 2 a of the precast lining member 2 Is installed on the top end surface 1 a of the foundation concrete 1 through the height adjusting member 5.
[0036]
At this time, both side walls 2a, 2a of the precast lining member 2 may be simultaneously installed on the top end faces 1a, 1a of both sides of the foundation concrete 1, 1, respectively, and one side wall 2a is set as one foundation concrete 1. After installing on the top end surface 1a, the other side wall 2a may be installed on the top end surface 1a of the other foundation concrete 1.
[0037]
Thus, when the both side walls 2a and 2a of the precast lining member 2 are installed on the top end surfaces 1a and 1a of the foundation concrete 1 and 1 on both sides, the reinforcing bars 4 and 4 are provided with reinforcing bars on the inner surfaces of the projecting tips. The positioning fitting 3 is locked, and the precast lining member 2 is installed at a predetermined position with respect to the width direction of the tunnel T (tunnel circumferential direction) in a state of being accurately oriented in the tunnel length direction.
[0038]
Further, in this state, the positioning metal fitting 3 and the locking metal fitting 4 are arranged in the front-rear direction in the locking metal fitting 4, that is, before and after the locking metal fitting 4 formed in a plane U shape. Since it is relatively movable in the tunnel length direction by a distance corresponding to the width interval between the leg collars, the precast lining member previously constructed by moving and adjusting the entire precast lining member 2 in the tunnel length direction The opposing end face of the precast lining member 2 is brought into contact with the end face curved in the shape of a circular arc to be integrally connected.
[0039]
Thereafter, the waterproof sheet 7 stretched in contact with the tunnel wall surface t with the inner peripheral surface of the precast lining member 2 supported by a support member (not shown) assembled in the tunnel T and the tunnel sheet t By injecting and solidifying a filler such as mortar into the space between the outer peripheral surfaces of the precast lining member 2, construction of the precast lining member 2 for one span is completed. It is constructed in the tunnel length direction to cover the entire tunnel.
[0040]
In the above embodiment, the positioning member 3 for positioning and installing the precast lining member 2 at a predetermined position on the top end surface 1a of the foundation concrete 1 is composed of reinforcing bars such as a reinforcing bar and an anchor reinforcing bar. Although the metal fitting 4 is constituted by a metal fitting bent in a plane U shape, the present invention is not limited to the shape and structure of the positioning metal fitting 3 and the locking metal fitting 4 as described below. A locking bracket may be used.
[0041]
FIG. 7 to FIG. 10 show one embodiment of the present invention. As the positioning fitting 3A standing on the top end surface 1a of the foundation concrete 1, the reinforcing bar or anchor reinforcing bar described in the above embodiment is used. However, instead of the plane U-shaped locking bracket 4, the locking bracket 4 A is formed at the tip of one leg collar 4 A 1 toward the rear in the tunnel length direction. That is, a flat L-shaped locking metal fitting provided with a tip flange 4A2 that is bent at a right angle toward the precast lining member 2 already applied is used. Note that the length of the tip flange 4A2 is longer than the width between the front and rear leg flanges of the flat U-shaped locking bracket 4.
[0042]
The mounting positions of these positioning metal fittings 3A and locking metal fittings 4A with respect to the lower end of the outer peripheral surface of the top end face 1a of the foundation concrete 1 and the side wall 2a of the precast lining member 2 are the same as in the above embodiment. That is, the positioning metal fitting 3A and the locking metal fitting 4A have a predetermined interval in the tunnel direction (front-rear direction) in at least two places in the tunnel length direction, and when the precast lining member 2 is engaged with each other, It is arranged at a position to be installed at a predetermined position on the top end surface 1a of the foundation concrete 1.
[0043]
With this construction, the side walls of the precast lining member 2 are lowered from the state in which the lower end surfaces of the both side walls 2a, 2a are opposed to the upper end surfaces 1a, 1a of the foundation concrete 1, 1 on both sides, respectively. The front L-shaped front and rear locking brackets 4A and 4A attached to the lower end of the outer peripheral surface of 2a project front and rear on the top end surface 1a of the foundation concrete 1 with the same spacing as the interval between the locking brackets 4A and 4A. The front and rear positioning metal fittings 3A and 3A are inserted into the front ends of the locking metal fittings 4A and 4A so as to be aligned with the positioning metal fittings 3A and 3A, and are engaged with each other. The lower end surfaces of the wall portions 2a, 2a are installed on the top end surfaces 1a, 1a of the foundation concretes 1, 1 on both sides via height adjusting members 5.
[0044]
Then, the precast lining member 2 is accurately oriented in the tunnel length direction at a predetermined position with respect to the width direction of the tunnel T (tunnel circumferential direction) by the locking of the positioning brackets 3A, 3A and the locking brackets 4A, 4A. In this state, the precast lining member 2 is moved in the tunnel length direction while sliding the tip portion refracted in the tunnel length direction of the locking metal fittings 4A and 4A to the positioning metal fittings 3A and 3A. The rear end surface curved in the arc shape is brought into contact with the front end surface curved in an arc shape with the precast lining member 2 previously constructed, and is integrally connected.
[0045]
At this time, the locking metal fitting 4A is formed in a plane L shape in which the tip flange portion 4A2 is refracted toward the precast lining member 2 that has been previously constructed. Without stopping the locking metal fitting 4A vertically above the positioning metal fitting 3A, the precast lining member 2 is temporarily placed on the top end face 1a having a relatively wide space forward from the precast lining member 2 previously constructed. After placing the locking bracket 4A in a state of facing the front of the positioning bracket 3A, the precast lining member 2 can be moved rearward to lock the locking bracket 4A to the positioning bracket 3A. In addition, even after locking, since the movement adjustment range of the locking metal fitting 4A in the tunnel length direction becomes long, the degree of freedom of construction in a narrow tunnel is increased, and the precast lining member 2 can be easily and reliably attached. Construction in place can do.
[0046]
11 to 13 show another embodiment of the positioning metal fitting and the locking metal fitting. The positioning metal fitting 3B standing on the top end surface 1a of the foundation concrete 1 is a horizontally long rectangular steel plate. Is bent into an L-shaped cross section, and the positioning member 3B having the L-shaped cross section is made to face the installation position of the precast lining member 2 on the top end surface 1a of the foundation concrete 1, and the horizontal strip 3B1 is set to the top end surface 1a. The vertical metal strip 3B2 is fixed upward in parallel to the tunnel length direction, and the locking bracket 4B protrudes upward from the end of the fixed leg 4B1. A vertical trunk 4B2 to be locked to the vertical strip 3B2 is bent and formed at a substantially right angle downward, and this locking bracket 4B is at least the outer periphery of both side walls 2a, 2a of the precast lining member 2 Disposed at least at two locations on the lower end of the surface The end of 4B1 is made by fixing the side wall portion 2a.
[0047]
Since it comprised in this way, when installing the precast lining member 2 on the top end surfaces 1a and 1a of the foundation concrete 1 and 1 of both sides like the above, both side wall parts 2a and 2a of the precast lining member 2 are attached. The front and rear locking brackets 4B and 4B are locked to the vertical strip 3B2 of the positioning bracket 3B by lowering the top end surface 1a, and the precast lining member 2 is installed at a predetermined position. Since the vertical strip 3B2 is continuous in the tunnel length direction, the precast lining member 2 is moved forward and backward from the precast lining member 2 which has been previously constructed by being separated by an appropriate distance. The locking brackets 4B, 4B can be locked to the vertical strip 3B2, and in this state, the precast lining member 2 is moved backward while locking the locking bracket 4B to the positioning bracket 3B. , The precast that was constructed earlier It is possible to connect the factory member 2, is capable of applying the precast lining member 2 becomes high degree of freedom in construction to easily and reliably position. Other configurations such as laying the height adjusting member 5 on the top end face 1a are the same as in the above embodiment.
[0048]
14 to 16 show still another embodiment of the positioning metal fitting and the locking metal fitting. As the positioning metal fitting 3C standing on the top end surface 1a of the foundation concrete 1, FIGS. Although it has the same shape and structure as the positioning bracket 3B shown in FIG. 13 and the same mounting position with respect to the top end surface 1a, the locking bracket 4C is made of a strip-shaped steel plate that is long in the tunnel length direction. 4C is arranged in the tunnel length direction at the lower end of the outer peripheral surface of both side walls 2a, 2a of the precast lining member 2, and its front and rear ends are fixed to the front and rear ends of the side wall 2a by bolts 8, 8. A certain gap is provided between the locking metal fitting 4C and the outer peripheral surface of the lower end portion of the side wall 2a so that the locking metal fitting 4C is locked to the positioning metal fitting 3C.
[0049]
Since it comprised in this way, when installing the precast lining member 2 on the top end surfaces 1a and 1a of the foundation concrete 1 and 1 of both sides, the outer peripheral surface lower end of the both-side wall parts 2a and 2a of this precast lining member 2 The locking bracket 4C made of a strip-shaped steel plate attached to the part is locked to the positioning bracket 3C on the top end surfaces 1a and 1a from above and installed at a predetermined position. Since both the 3C and the locking metal fitting 4C are made of a strip-shaped steel plate that is long in the tunnel length direction, as in the above-described embodiment, the precast lining member 2 that has been previously constructed is suitable for the front. Even when lowered in the state of being spaced apart, the locking bracket 4C can be securely locked in place on the positioning bracket 3C, and in this state, the pre-cast cover is applied while the locking bracket 4C is in sliding contact with the positioning bracket 3C. Move the work piece 2 backward Since it can be connected with the precast lining member 2 previously constructed, the degree of freedom of construction is increased and the precast lining member 2 can be constructed easily and reliably at a predetermined position. is there. Other configurations such as laying the height adjusting member 5 on the top end face 1a are the same as in the above embodiment.
[0050]
【The invention's effect】
As described above, according to the precast lining member field installation structure according to claim 1 of the present invention, the locking metal fittings are attached to the lower end portions of the outer peripheral surfaces of the both side walls of the precast lining member, while the top end surface of the foundation concrete is provided. A positioning bracket is fixed on the top end surface so as to oppose the positions of the lower end portions of the both side walls of the precast lining member, and the precast covering member is engaged with the locking bracket of the precast lining member. Since the construction members are installed on the foundation concrete, when installing the both side walls of the precast lining member on the top end surface, the locking brackets attached to the lower end of the outer peripheral surface of the both side walls are attached to the top. The precast lining member can be easily installed at an accurate position in the tunnel width direction simply by locking the positioning bracket fixed on the end face from above. Since the lower end surface of the construction member is fully supported on the top end surface of the foundation concrete, the precast lining member must be securely and firmly installed despite the simple installation structure. Can do.
[0051]
Further, when the precast lining member is installed on the top end surface of the foundation concrete, a laying iron plate or a mortar is laid between the top end surface and the lower end surface of the precast lining member. The installation height can be adjusted accurately, and in addition, no metal fittings such as bolts that support the precast lining member are attached to the tunnel wall surface. No bolt insertion hole is provided, and therefore, a water-stopping treatment or the like for the insertion hole is not required, and the precast lining member can be easily and efficiently constructed.
[0052]
Besides, this Installation structure of precast lining members In precast lining members The locking metal fittings attached to the lower end of the outer peripheral surface of both side walls of the two sides are fixed to the positioning metal fittings fixed on both sides of the foundation concrete so that the positioning metal fittings can be moved and adjusted in the tunnel length direction. Therefore, when installing the precast lining member on the top end surface of the foundation concrete, the interval at which the installation work can be easily performed forward from the front end of the precast lining member on which the precast lining member has already been installed. After that, the precast lining member is moved backward while sliding the locking bracket to the positioning bracket, and it is easily and accurately connected to the precast lining member previously constructed. Can be made.
[0053]
As the shape and structure of the locking bracket and positioning bracket, 2 In the invention according to the present invention, the locking metal fittings are formed in a plane U shape, while the positioning metal fittings are formed from reinforcing bars protruding from the top end face, and these U-shaped locking metal fittings and reinforcing bars Are disposed at predetermined intervals in at least two locations in the tunnel length direction on the lower end portion of the outer peripheral surface of the precast lining member and the top end surface of the foundation concrete, when the precast lining member is installed. By simply engaging a flat U-shaped locking bracket with a positioning bracket made of reinforcing steel so that it can be covered from above, it can be easily and automatically installed at an accurate position and positioned with the locking bracket. Since the metal fittings are provided in pairs on the front and rear sides, the precast lining member can be installed in a state of being accurately oriented in the tunnel length direction. Kicking by a distance corresponding to the longitudinal direction of the length of the tip portion, it is possible to finely adjust the longitudinal precast lining member.
[0054]
Meanwhile, claims 3 According to the invention according to claim 1, 2 In the invention described in the above, since the locking metal fittings are formed in a plane L shape, the locking metal fittings can be locked from the front and rear directions with respect to the positioning metal fittings made of reinforcing bars. The degree of freedom during construction of the members increases, and the degree of freedom of movement adjustment in the front-rear direction also increases to facilitate construction.
[0055]
Similarly, the claims 4 As described above, the locking bracket may be formed from a bracket bent in a front inverted L shape, while the positioning bracket may be formed from a steel plate having an L-shaped cross section that is long in the tunnel length direction. Instead of the front inverted L-shaped locking bracket, 5 It may be formed from a strip-shaped steel material that is long in the tunnel length direction as described above, and this strip-shaped steel material may be configured to be locked from above by a positioning bracket made of a steel plate having an L-shaped cross section.
[0056]
In this case, since the positioning bracket fixed on the top end surface of the foundation concrete is made of a steel plate having an L-shaped cross section that is long in the tunnel length direction, the lower end portion of the outer peripheral surface of both side walls of the precast lining member The pre-cast lining member is slightly displaced in the length direction with respect to the installation position of the front inverted L-shaped locking bracket attached to the above or the locking bracket made of a strip-shaped steel material that is long in the tunnel length direction. Even if it is locked to the positioning bracket from above, it can be installed at an accurate position in the tunnel width direction, and then the locking bracket in the length direction of the positioning bracket that is long in the tunnel length direction. By moving and adjusting the precast lining member in a state of being locked, it is possible to easily and accurately connect to the precast lining member previously constructed.
[Brief description of the drawings]
FIG. 1 is a partial perspective view of a precast lining member installed on foundation concrete.
FIG. 2 is a simplified longitudinal sectional front view thereof.
FIG. 3 is a side view.
FIG. 4 is a cross-sectional view.
FIG. 5 is a simplified front view of a precast lining member.
FIG. 6 is a plan view seen from the inner surface side in a state where opposed end surfaces of the divided lining members are connected to each other.
FIG. 7 is a partial perspective view showing another installation structure of the precast lining member.
FIG. 8 is a simplified longitudinal sectional front view thereof.
FIG. 9 is a side view.
FIG. 10 is a cross-sectional view.
FIG. 11 is a partial perspective view showing still another installation structure of the precast lining member.
FIG. 12 is a simplified longitudinal sectional front view thereof.
FIG. 13 is a side view.
FIG. 14 is a partial perspective view showing still another installation structure of the precast lining member.
FIG. 15 is a simplified longitudinal sectional front view thereof.
FIG. 16 is a side view.
FIG. 17 is a longitudinal front view of a main part showing a conventional example.
[Explanation of symbols]
1 Foundation concrete
1a Top face
2 Precast lining members
2a Side wall
3 Positioning bracket
4 Locking bracket
5 Height adjustment member
7 Tarpaulin
t Tunnel wall surface

Claims

A precast lining member installation structure in which the lower ends of both side wall portions of a precast lining member arranged along a tunnel wall surface are installed on both side foundation concrete in the tunnel, wherein both side wall portions of the precast lining member are While the lower end of the outer peripheral surface is fitted with a locking bracket, the positioning bracket is fixed on the top end surface of the top end surface of the foundation concrete so as to face the positions of the lower end portions of both side walls of the precast lining member. It is characterized in that the precast lining member is installed on the foundation concrete by contacting the positioning bracket and engaging the locking bracket of the precast lining member so as to be movable and adjustable in the tunnel length direction. Installation structure of precast lining members.

The locking fittings attached to the lower end portions of the outer peripheral surfaces of the both side walls of the precast lining member are made of flat U-shaped fittings, while the positioning fittings fixed to the top end surfaces of the both side foundation concrete are made from the top end surfaces. It consists rebar being projected, and these U-shaped locking bracket and rebar, claims, characterized in that it is arranged at predetermined intervals in at least two places in the tunnel longitudinal direction The installation structure of the precast lining member of 1 .

The locking brackets attached to the lower end portions of the outer peripheral surfaces of the both side walls of the precast lining member are flat L-shaped brackets, while the positioning brackets fixed to the top end surfaces of the both side foundation concrete are It consists rebar being projected, and these L-shaped locking bracket and rebar, claims, characterized in that it is arranged at predetermined intervals in at least two places in the tunnel longitudinal direction The installation structure of the precast lining member of 1 .

The locking brackets attached to the lower end of the outer peripheral surface of both side walls of the precast lining member are made of a front inverted L-shaped bracket bent downward, while the positioning brackets are fixed to the top end surfaces of the both-side foundation concrete Is made of a steel plate having an L-shaped cross section that is long in the tunnel length direction, and the front inverted L-shaped locking brackets are attached to at least two locations on the lower end of the outer peripheral surface of both side walls of the precast lining member. 2. The precast lining member installation structure according to claim 1 , wherein the locking metal fitting is configured to be engaged with the positioning metal fitting made of the L-shaped steel plate in cross section.

The locking bracket attached to the lower end of the outer peripheral surface of both side walls of the precast lining member is a belt-like shape that is long in the tunnel length direction and is fixed with a gap between the lower end and the outer peripheral surface. On the other hand, the positioning metal fittings fixed to the top end surfaces of the both sides of the foundation concrete are made of L-shaped steel plates that are long in the tunnel length direction, and the L-shaped positioning metal fittings are made of the above-mentioned belt-like steel plates. The installation structure of the precast lining member according to claim 1 , wherein the metal fitting is configured to be locked.

A method of constructing a precast lining member along the tunnel wall surface between the top end surfaces of both side foundation concrete in the tunnel, the lower end portions of the both side wall portions of the precast lining member at the top end surface of the both side foundation concrete in the tunnel While the positioning bracket is fixed facing the installation position, a locking bracket that can be engaged with the positioning bracket is attached to the lower end of the outer peripheral surface of both side walls of the precast lining member, and the tunnel wall surface is fixed. the precast lining both side walls of the anchor fitting is mounted on the outer peripheral surface lower portion in contact with the alignment ferrule tunnel length direction movement adjustably engaging the member while applying a precast lining member along The precast lining member is installed at a predetermined position on the top end surface of the foundation concrete on both sides, and then the precast lining member is Injecting a filler material from the channel between the precast lining member and the tunnel wall while supporting the 支保 member, the construction method of the precast lining member, characterized in that to solidify.

The height adjustment of the precast lining member is characterized in that it is performed by the thickness of the laying iron plate or the mortar mortar interposed between the top end surface of the both-side foundation concrete and the lower end surfaces of the both side walls of the precast lining member. The construction method of the precast lining member of Claim 6 .