JP4099293B2

JP4099293B2 - Tunnel interior board direct installation method and equipment

Info

Publication number: JP4099293B2
Application number: JP21039499A
Authority: JP
Inventors: 敏男福村; 裕二船平; 勉北川; 毅相崎
Original assignee: 岐阜工業株式会社
Priority date: 1999-07-26
Filing date: 1999-07-26
Publication date: 2008-06-11
Anticipated expiration: 2019-07-26
Also published as: JP2001032689A

Description

【０００１】
【発明の属する技術分野】
本発明は、トンネル内に打設した二次覆工用コンクリート表面の防護と美観を向上させるためのトンネル内装板を、二次覆工用コンクリート打設と同時施工することができるトンネル内装板の直打設工法およびその装置に関するものである。なお、本明細書中、「打設」とは、養生硬化してない流動性コンクリートを型枠と、トンネル内壁面または一次覆工用コンクリートと、の間に充填させることをいう。
【０００２】
【従来の技術】
元来、トンネル壁面（二次覆工させたコンクリートの表面）との輝度差から視線誘導を促し、ドライバーの視認性を向上させ、自動車の安定走行を支援すると共に、トンネル壁面の漏水、配管の露出、トンネル壁面の不揃いを被覆することによりトンネル壁面の防護と美観を向上させる措置として、通常トンネル壁面の下方部分に、白色系塗装を施したトンネル内装板を施工し（取付け）ていた。
【０００３】
その工程は、まずトンネル壁面である二次覆工用コンクリートの表面に固定金具を固着させた後、各固定金具にそれぞれトンネル内装板を固定させたり、あるいは固定金具を使用することなく、トンネル内装板を貼着用モルタルを介して直に二次覆工用コンクリートの表面に固定していた。
【０００４】
【発明が解決しようとする課題】
従来、トンネル内装板の施工は、二次覆工用コンクリートの打設後に別途行われていたため、トンネルの全長が長い程その工期も長くなり、一年近くかかる場合もあり、施工期間が長いことが問題となっていた。
【０００５】
また、各固定金具に、個々にトンネル内装板を固定したり、貼着用モルタルを介して個々にトンネル内装板を固定していたため、作業能率が良くないことが問題となっていた。
【０００６】
また、トンネル内は、湧水や高い湿度、冬季の凍結防止剤、自動車の排気ガス等もあり、汚損し易く、金属の腐食が進行する環境であるため、固定金具が腐食したり、貼着用モルタルが劣化すると共に、自動車からの衝撃、清掃作業時の清掃具の圧力等によりトンネル内装板の表面が汚損するため、永年使用中、固定金具の取替え、トンネル内装板の洗浄、取替え等を何度も行う必要があり、この維持管理に大きな負担が掛かることが問題となっていた。
【０００７】
また、固定金具の取替え、トンネル内装板の洗浄、取替え等の補修工事において、トンネル内の片側車線を止めて行う必要があり、このため交通渋滞となり、トンネル内装板の補修工事の際にも容易に施工可能な工法が強く要望されている。
【０００８】
本発明は、この要望に対処すべく、型枠へのトンネル内装板の止着がし易く、二次覆工用コンクリート打設と同時施工ができるトンネル内装板の直打設工法およびその装置を提供することを目的とするものである。
【０００９】
【課題を解決するための手段】
本発明は、トンネル内に打設した二次覆工用コンクリートの表面にトンネル内装板を取付ける工法および装置において、トンネル内に二次覆工用コンクリートを打設する型枠の外周面に、基板に内装板を多数固着させ、かつ基板の適所に止着孔を貫通させてなるトンネル内装板を、トンネル内装板の表面を型枠に当接させると共に、トンネル内装板の止着孔に型枠内側から、先端に傾倒自在の引寄体を着脱自在に装着させた止着金具の引寄体を、挿入後、引寄体を自重により垂直方向に傾倒させてトンネル内装板に係止させ、止着金具を型枠内側に引寄せてトンネル内装板を型枠に密着させた後、止着金具を型枠内側に固定することにより、トンネル内装板を型枠に止着させた後、トンネル内に型枠を介して二次覆工用コンクリートを打設し、二次覆工用コンクリートの養生硬化後、止着金具の先端から引寄体を分離し、型枠を脱型させることにより、引寄体を二次覆工用コンクリート内に埋設すると共に、二次覆工用コンクリートの表面にトンネル内装板を直に取付けることを特徴とするもの、または型枠内側からトンネル内装板の止着孔への止着金具の引寄体の挿入において、止着金具を挿入チューブに内挿させた後、挿入チューブと共に引寄体をトンネル内装板の止着孔に挿入させた後、挿入チューブのみをトンネル内装板の止着孔から抜出すことにより、引寄体を自重により垂直方向に傾倒させることを特徴とするもの、またはトンネル内装板の型枠外周面への当接において、型枠外周下方に配設させた突出板上にトンネル内装板を載置させた後、このトンネル内装板の上方に順次トンネル内装板を積上げ、各トンネル内装板を型枠に止着後、二次覆工用コンクリートを打設することを特徴とするもの、またはトンネル内装板の型枠外周面への当接において、型枠外周に略格子状に配設させた突出板の各区画内にトンネル内装板を載置させた後、各トンネル内装板を型枠に止着後、二次覆工用コンクリートを打設することを特徴とするもの、またはトンネル内装板の基板を、柔軟性素材により成形し、型枠外周面への密着性を向上させ、打設した二次覆工用コンクリートのトンネル内装板表面への浸出を防止することを特徴とするものである。
【００１０】
【発明の実施の形態】
本発明に係るトンネル内装板の直打設装置は、図１〜図８に示すように、型枠１６、トンネル内装板１８および止着金具２８からなるものであり、その構造を以下に詳述する。
【００１１】
型枠１６は、トンネル１２内に二次覆工用コンクリート１４を打設するためのものであり、正面略半円状で、移動機構（図示略）を装備している。
【００１２】
トンネル内装板１８は、基板２０表面に内装板２２を多数固着させ、かつ基板２０の適所に止着孔２４を貫通させてある。
【００１３】
本例において、トンネル内装板１８は、基板２０がガラス繊維混入の柔軟性コンクリート板であり、内装板２２がタイルであり、隣接する各内装板２２間に目地２６が形成され、この目地２６上に止着孔２４を貫通させてある。
【００１４】
止着金具２８は、先端に傾倒自在の引寄体３０を着脱自在に装着させたものである。
【００１５】
本例において、引寄体３０は平板であり、止着金具２８先端と軸着させることにより、自重により垂直方向に傾倒自在の構造とし、また引寄体３０の着脱手段はネジ機構３２によるものである。
【００１６】
また、止着金具２８の引寄体３０を、トンネル内装板１８の止着孔２４へ挿入し、挿入後引寄体３０を自重により垂直方向に傾倒させ易くするために、止着金具２８を内挿し、止着金具２４と共に止着孔２４へ挿入する挿入チューブ３４が設けられている。
【００１７】
この挿入チューブ３４を採用することにより、予め止着金具２８を内挿した後、トンネル内装板１８の止着孔２４へ止着金具２８と共に挿入チューブ３４を挿入した後、挿入チューブ３４のみを型枠１６内側に抜出すことにより、容易に引寄体３０を自重により垂直方向に傾倒させ、トンネル内装板１８へ係止させることができる。
【００１８】
また、型枠１６へのトンネル内装板１８の止着作業を効率的に行うため、型枠１６の外周下方に突出板３６が出没自在に配設されている。
【００１９】
この突出板３６は型枠１６にトンネル内装板１８を当接させる際、外側に突出させた後、この突出させた突出板３６上に上下方向の位置の基準となる最下段のトンネル内装板１８を載置させ、このトンネル内装板１８上に順次トンネル内装板１８を積上げて、型枠１６へのトンネル内装板１８の当接作業を行い、各トンネル内装板１８の型枠１６への止着作業完了後、型枠１６内へ収納し、次工程である二次覆工用コンクリート打設作業に備える。
【００２０】
このトンネル内装板１８の止着作業完了後、型枠１６内へ突出板３６を収納するのは、型枠１６外側に突出板３６を突出させた状態で二次覆工用コンクリート１４を打設すると、養生硬化後、型枠１６脱型時に二次覆工用コンクリート表面に突出板３６の痕跡が凹部として残存し、美観を損なうばかりか、強度低下の要因となるため、二次覆工用コンクリート１４の打設前に型枠１６内に収納し、打設した二次覆工用コンクリート表面を平滑にし、強度低下を防止するためである。
【００２１】
また、各トンネル内装板１８の止着孔２４がそれぞれ所定位置に貫通され、かつ突出板３６上に上下方向の位置の基準となる最下段のトンネル内装板１８を載置させるため、止着孔２４の上下方向の位置ズレは生ずることがないが、止着孔２４の左右方向の位置ズレを調整するために型枠１６内側に以下の調整機構３８が装備されている。
【００２２】
予め型枠１６周面には、トンネル内装板１８の止着孔２４に対応する長孔４０が穿孔され、この長孔４０に対応する型枠１６内部に、止着金具２８の挿通孔４２を貫通させた支持板４４を、移動自在に配設させることにより調整機構３８が構成されている。
【００２３】
この調整機構３８により、まず支持板４４を型枠１６の長孔４０内を左右方向に移動させ、型枠１６の外周面に当接させたトンネル内装板１８の止着孔２４の位置に対応させ、支持板４４の挿通孔４２、型枠１６の長孔４０およびトンネル内装板１８の止着孔２４を合致させた後、型枠１６の内側から止着金具２８をトンネル内装板１８の止着孔２４へ挿入させることが可能となり、止着金具２８の各孔４２，４０，２４への挿入が極めて容易になる。
【００２４】
この際、型枠１６の外周面に穿孔された長孔４０は、トンネル内装板１８の型枠１６への止着時に、トンネル内装板１８により完全に被覆されるため、打設された二次覆工用コンクリート１４が型枠１６内部に浸入することはない。
【００２５】
なお、図中４６は各トンネル内装板１８の外周縁に装着されたシール部材、４８は内装板２２表面に貼付された保護シート、５０は止着金具２４の外周面に形成されたネジ部、５２は止着金具２４のネジ部５０に対応する止着ナット、５４は止着金具２４を支持板４４へ支持させるための座板、５６はトンネル内壁面を示す。
【００２６】
本装置を使用してトンネル１２内の二次覆工用コンクリート１４の表面にトンネル内装板１８を直に取付ける工法を以下に詳述する。
【００２７】
まず、型枠１６をトンネル１２の所定位置まで移動させる。
【００２８】
この際、型枠１６のトンネル坑口側（トンネル掘削側と反対側）は、既二次覆工用コンクリート打設部（図示略）と重合させる。
【００２９】
次に、型枠１６の外周下方の突出板３６を外側に突出させ、予めトンネル１２内のトンネル内壁面５６の近部に運び込まれたトンネル内装板１８を、突出させた突出板３６上に、載置させ、型枠１６の外周面にトンネル内装板１８を当接させる。
【００３０】
次に、基準となる最下段のトンネル内装板１８上に、順次各トンネル内装板１８を積上げる。
【００３１】
この際、上下、左右に隣接する各トンネル内装板１８間は、シール部材４６により確実にシールされ、打設される二次覆工用コンクリート１４のトンネル内装板１８表面への浸出および型枠１６内への浸入を防止することができる。
【００３２】
次に、型枠１６内側の支持板４４を移動させ、支持板４４の挿通孔４２を、型枠１６の外周面に当接させた各トンネル内装板１８の止着孔２４に合致させて位置させる。
【００３３】
この支持板４４の挿通孔４２と、トンネル内装板１８の止着孔２４と、の位置調整作業は各トンネル内装板１８に対して個別に行う。
【００３４】
次に、型枠１６の内側から挿入チューブ３４に内挿させた止着金具２８を、支持板４４の挿通孔４２、型枠１６の長孔４０を経てトンネル内装板１８の止着孔２４へ挿入させた後、挿入チューブ３４のみを型枠１６内側に抜出し、止着金具２８の先端の引寄体３０を自重により垂直方向に傾倒させ、トンネル内装板１８へ係止させる。
【００３５】
この際、止着金具２８は挿入チューブ３４に内挿されているため、挿通孔４２、長孔４０および止着孔２４への、止着金具２８の挿入が容易となると共に、挿入チューブ３４のみを各孔４４、４０、２４から抜出すことにより、止着金具２８の先端の引寄体３０を容易に自重により垂直方向に傾倒させることができる。
【００３６】
次に、トンネル内装板１８を、止着金具２８を介して型枠１６内側に引寄せることにより、型枠１６の外周面にトンネル内装板１８を密着させる。
【００３７】
この際、トンネル内装板１８の基板２０が柔軟性コンクリート板であるため、型枠１６外周面へ確実に密着し、打設した二次覆工用コンクリート１４のトンネル内装板１８表面への浸出をより効果的に防止することができる。
【００３８】
次に、型枠１６内側において、止着金具２８を、座板５４を介して支持板４４に、止着金具２８のネジ部５０に止着ナット５２を螺着させることにより、支持固定する。
【００３９】
次に、各トンネル内装板１８の型枠１６への止着作業完了後、打設した二次覆工用コンクリート表面を平滑にし、強度低下を防止するため、突出板３６を型枠１６内へ収納する。
【００４０】
次に、型枠１６のトンネル妻側（トンネル掘削側）周縁を確実に被覆（妻止め）する。
【００４１】
次に、トンネル内壁面５６と型枠１６との間に二次覆工用コンクリート１４を打設させ、養生硬化させる。
【００４２】
次に、止着金具２８を、先端の引寄体３０との着脱手段であるネジ機構３２を解除することにより、引寄体３０から分離する。
【００４３】
この引寄体３０を止着金具２８の先端から分離するのは、引寄体３０がトンネル内装板１８と共に養生硬化した二次覆工用コンクリート１４内に埋設状態となるため、このままの状態では型枠１６脱型作業ができなくなり、この脱型作業を行うためである。
【００４４】
また、引寄体３０を分離させた止着金具２８は、支持板４４から取外し、次回使用に備えて新たな引寄体３０を取付ける。
【００４５】
次に、型枠１６を脱型させる。
【００４６】
この際、型枠１６の外周面にトンネル内装板１８が止着されているため、二次覆工用コンクリート１４打設時に、トンネル内装板１８の基板２０側が二次覆工用コンクリート１４内に埋設された状態となり、二次覆工用コンクリート１４の養生硬化完了後、打設した二次覆工用コンクリート１４の表面に、トンネル内装板１８が固着される。
【００４７】
また、型枠１６の脱型時、型枠１６の外周面に止着されたトンネル内装板１８は、基板２０が養生硬化した二次覆工用コンクリート１４に固着され、この固着力が強大であるため、トンネル内装板１８は型枠１６から容易に剥離する。
【００４８】
次に、二次覆工用コンクリート１４の表面に固着されたトンネル内装板１８の内装板２２の表面側の保護シート４８を除去すると共に、トンネル内装板１８の表面を洗浄する。
【００４９】
前記工程により、型枠１６が設置された個所に、二次覆工用コンクリート１４の打設と共に、トンネル内装板１８の施工が完了する。
【００５０】
このトンネル内装板１８の施工を、トンネル妻側へ向けて順次型枠１６を移動させて行い、トンネル１２の全長にわたり行う。
【００５１】
また、図９〜図１１に本発明に係る装置の別の例が示してある。
【００５２】
本例は、三角突条型の突出板３６を型枠１６の外周に略格子状に配設させたものであり、トンネル内装板１８の型枠１６の外周面への当接において、突出板３６により形成された各区画５８内にトンネル内装板１８をそれぞれ載置させた後、各トンネル内装板１８を型枠１６に止着金具２８を介して止着後、二次覆工用コンクリート１４を打設するものである。
【００５３】
この際、前例と同様、打設した二次覆工用コンクリート表面を平滑にし、強度低下を防止するため、トンネル内装板１８の型枠１６への止着作業完了後、突出板３６を型枠１６内へ収納させるために出没自在とすることが望ましいが、突出板３６の型枠１６からの突出長を短くし、型枠脱型時のトンネル内装板１８および打設した二次覆工用コンクリート表面へのダメージを最小限に抑える配慮をすることにより、必ずしも突出板３６は出没自在としなくてもよい。
【００５４】
また、本例において、トンネル内装板１８は突出板３６により形成された各区画５８内にそれぞれ１個ずつ載置させるため、型枠１６の上下左右方向に対してトンネル内装板１８の位置ズレがなく、正確にトンネル内装板１８の直打設作業が行え、また前例のように型枠１６に調整機構３８を設ける必要がない。
【００５５】
なお、両例において、トンネル内装板１８を柔軟性を有しないコンクリート板とすることは自由であり、また内装板２２はタイルに限定されることはなく、壁面パネル等の板材を使用することは自由である。
【００５６】
また、トンネル内装板１８の止着孔２４への止着金具２８の挿入は、挿入チューブ３４へ内挿させて挿入するものであるが、挿入チューブ３４を省略して止着金具２８をそのままトンネル内装板１８の止着孔２４へ挿入することは自明のことである。
【００５７】
また、型枠１６外周上方からワイヤー等を使用してトンネル内装板１８を吊持させることにより、突出板３６を省略できることは自明のことである。
【００５８】
また、型枠１６外周へのトンネル内装板１８の止着は、先端に傾倒自在の引寄体３０を着脱自在に装着させた止着金具２８によるものであるが、型枠１６内側からボルトをトンネル内装板１８へ貫通させ、作業者が型枠１６とトンネル内壁面５６との間でボルトにナットを止着させることにより、止着金具２８に代えてボルトを使用することが可能となる。
【００５９】
また、前例において、型枠１６へのトンネル内装板１８の当接作業は、型枠１６の外周下方の出没自在に突出させた突出板３６を利用するものであるが、突出板３６の型枠１６からの突出長を短くし、型枠脱型時のトンネル内装板１８および打設した二次覆工用コンクリート１４表面へのダメージを最小限に抑える配慮をすることにより、必ずしも突出板３６は出没自在としなくてもよい。
【００６０】
また、トンネル内装板１８の型枠１６への止着個所は主に型枠１６の下方部分であるが、型枠１６の他の個所へも止着させることは自由である。
【００６１】
また、後例において、突出板３６は三角突条型であるが、矩形型、等その他の形状の突条とすることは自由であり、また上下左右方向に直線状に配設させてあるが、所定間隔を隔てて点在させることは自明のことである。
【００６２】
また、両例は略半円形のトンネル等のコンクリート打設におけるものであるが、円形のトンネル、例えば海中トンネル、下水道等にも利用できる。
【００６３】
【発明の効果】
本発明に係るトンネル内装板の直打設工法およびその装置によれば、二次覆工用コンクリートを打設するための型枠の外周面に、トンネル内装板を、型枠内側からトンネル内装板の止着孔に、先端に傾倒自在の引寄体を備えた止着金具を挿入させ、引寄体を自重により垂直方向に傾倒させて係止させ、止着金具を型枠内側に引寄せることにより、密着させ、二次覆工用コンクリート打設と同時にトンネル内装板の施工をするため、型枠へのトンネル内装板の止着作業が極めて容易であり、また二次覆工と別にトンネル内装板の施工を行う必要がなく、トンネル内装板の施工期間を大幅に短縮できる。
【００６４】
また、トンネル内装板を直に二次覆工用コンクリートの表面に取付けることにより、従来使用していた固定金具、貼着用モルタルを省くことができるため、固定金具の腐食、貼着用モルタルの劣化によるトンネル内装板の損傷が皆無となるばかりか、固定金具の取替え、トンネル内装板の取替え等の補修工事の回数が激減し、維持管理に掛かる負担を激減させることができる。
【００６５】
また、トンネル内装板の止着孔への止着金具の引寄体の挿入において、止着金具を挿入チューブに内挿させることにより、トンネル内装板の止着孔への、止着金具の挿入が容易となると共に、挿入チューブのみを止着孔から抜出すことにより、止着金具の引寄体を容易に自重により垂直方向に傾倒させることができる。
【００６６】
また、トンネル内装板の型枠外周面への当接時に、型枠外周下方に配設させた突出板上に載置させた後、このトンネル内装板の上方に順次トンネル内装板を積上げ、各トンネル内装板を型枠に止着後、二次覆工用コンクリートを打設することより、突出板上に上下方向の位置の基準となる最下段のトンネル内装板が載置されるため、トンネル内装板の止着孔の上下方向の位置ズレが生ずることがない。
【００６７】
また、トンネル内装板の型枠外周面への当接において、型枠外周に略格子状に配設させた突出板の各区画内にトンネル内装板を載置させた後、各トンネル内装板を型枠に止着後、二次覆工用コンクリートを打設することにより、トンネル内装板が突出板により形成された各区画内にそれぞれ１個ずつ載置されるため、型枠の上下左右方向に対してトンネル内装板の位置ズレがなく、正確にトンネル内装板の直打設作業を行うことができる。
【００６８】
また、トンネル内装板の基板を、柔軟性素材により成形することにより、型枠外周面への密着性を向上させ、打設した二次覆工用コンクリートのトンネル内装板表面への浸出を防止することができる。
【図面の簡単な説明】
【図１】本発明に係るトンネル内装板の直打設装置を示す要部拡大側面図。
【図２】同、正面図。
【図３】トンネル内装板の正面図。
【図４】同、側面図。
【図５】図４のＡ部拡大正面図。
【図６】止着金具および挿入チューブの分解正面図。
【図７】トンネル内装板の型枠への止着作業工程を示す正面図。
【図８】本発明のトンネル内装板の直打設工程を示す簡略正面図。
【図９】本発明に係るトンネル内装板の直打設装置の別の例を示す要部拡大正面図。
【図１０】同、側面図。
【図１１】図１０のＢ部拡大図。
【符号の説明】
１２トンネル
１４二次覆工用コンクリート
１６型枠
１８トンネル内装板
２０基板
２２内装板
２４支持孔
２８止着金具
３０引寄体
３４挿入チューブ
３６突出板
５６トンネル内壁面
５８区画[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel interior board that can be constructed simultaneously with concrete placement for secondary lining, in order to improve the protection and aesthetics of the concrete surface for secondary lining placed in the tunnel. The present invention relates to a direct placement method and an apparatus therefor. In the present specification, “laying” means filling fluid concrete that is not cured and hardened between the mold and the inner wall surface of the tunnel or the concrete for primary lining.
[0002]
[Prior art]
Originally, it promotes line-of-sight guidance from the brightness difference from the tunnel wall (secondary lining concrete surface), improves driver visibility, supports stable driving of the automobile, As a measure to improve the protection and aesthetics of the tunnel wall surface by covering the exposure and unevenness of the tunnel wall surface, a tunnel interior board with white coating was usually applied (attached) to the lower part of the tunnel wall surface.
[0003]
The process is as follows. First, fixing brackets are fixed to the surface of the concrete for secondary lining, which is the tunnel wall surface, and then the tunnel interior plate is fixed to each fixing bracket or without using the fixing bracket. The plate was fixed directly to the surface of the concrete for secondary lining through the mortar to which the plate was attached.
[0004]
[Problems to be solved by the invention]
Traditionally, the construction of tunnel interior plates was done separately after placing concrete for secondary lining, so the longer the tunnel, the longer the construction period, which may take up to one year, and the construction period is long. Was a problem.
[0005]
Moreover, since the tunnel interior board was individually fixed to each fixing bracket, or the tunnel interior board was individually fixed through the attaching mortar, there was a problem that work efficiency was not good.
[0006]
In addition, there are spring water, high humidity, anti-freezing agent in winter, automobile exhaust gas, etc. in the tunnel, which is easily contaminated and the environment where metal corrosion progresses. As the mortar deteriorates and the surface of the tunnel interior plate is soiled by the impact from the automobile, the pressure of the cleaning tool during the cleaning work, etc. It was necessary to do this again and again, and it was a problem that a heavy burden was placed on this maintenance.
[0007]
In addition, it is necessary to stop the lane on one side of the tunnel for repair work such as replacement of fixing brackets, cleaning of tunnel interior plates, replacement, etc., resulting in traffic congestion and easy repair of tunnel interior plates. There is a strong demand for a construction method that can be used in the future.
[0008]
In order to cope with this demand, the present invention is directed to a tunnel interior board direct placing method and an apparatus thereof which can be easily attached to a formwork and can be installed simultaneously with concrete placement for secondary lining. It is intended to provide.
[0009]
[Means for Solving the Problems]
The present invention relates to a method and an apparatus for attaching a tunnel interior plate to a surface of a secondary lining concrete placed in a tunnel, and a substrate on the outer peripheral surface of a mold for placing the secondary lining concrete in the tunnel. A large number of interior plates are fixed to each other, and a tunnel interior plate is formed by passing through fastening holes at appropriate positions on the substrate. The surface of the tunnel interior plate is brought into contact with the formwork, and the formwork is attached to the fastening holes of the tunnel interior plate. From the inside, after inserting the attachment body of the fastening metal fitting that can be attached to the tip detachably at the tip, after the insertion body is tilted in the vertical direction by its own weight and locked to the tunnel interior plate, After the fastening bracket is drawn inside the formwork to bring the tunnel interior plate into close contact with the formwork, the fastening plate is fixed to the inside of the formwork to secure the tunnel interior plate to the formwork, and then the tunnel Place concrete for secondary lining through the formwork inside. After curing and curing the secondary lining concrete, the attracting body is separated from the tip of the fastening bracket, and the formwork is removed, so that the attracting body is embedded in the secondary lining concrete. In the case where the tunnel interior plate is directly attached to the surface of the concrete for the next lining, or in the insertion of the attachment body of the fastening bracket from the inside of the formwork to the fastening hole of the tunnel interior plate, the fastening bracket Is inserted into the insertion tube, and then the attracting body is inserted into the fixing hole of the tunnel interior plate together with the insertion tube, and then only the insertion tube is pulled out from the fixing hole of the tunnel interior plate. In which the tunnel interior plate is tilted in the vertical direction by its own weight, or the tunnel interior plate is placed on the protruding plate disposed below the outer periphery of the mold frame when the tunnel interior plate is in contact with the outer surface of the mold frame. After this tunnel interior plate The tunnel interior plates are stacked one after another, and each tunnel interior plate is fixed to the mold, and then concrete for secondary lining is cast, or the tunnel interior plate abuts against the outer periphery of the mold In this case, after placing the tunnel interior plate in each section of the projecting plate disposed in a substantially grid pattern on the outer periphery of the mold, after fixing the tunnel interior plate to the mold, the concrete for secondary lining is applied. A concrete tunnel interior board for secondary lining, which is characterized by being cast, or a tunnel interior board formed from a flexible material to improve adhesion to the outer periphery of the formwork. It is characterized by preventing leaching to the surface.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 to 8, the direct placement device for a tunnel interior board according to the present invention comprises a mold 16, a tunnel interior board 18 and a fastening bracket 28, and the structure thereof will be described in detail below. To do.
[0011]
The formwork 16 is for placing the secondary lining concrete 14 in the tunnel 12, has a substantially semicircular front shape, and is equipped with a moving mechanism (not shown).
[0012]
In the tunnel interior plate 18, a large number of interior plates 22 are fixed to the surface of the substrate 20, and fastening holes 24 are penetrated at appropriate positions of the substrate 20.
[0013]
In this example, the tunnel interior board 18 is a flexible concrete board in which the substrate 20 is mixed with glass fiber, the interior board 22 is a tile, and joints 26 are formed between the adjacent interior boards 22. The fastening hole 24 is made to pass through.
[0014]
The fastening bracket 28 is configured such that a tiltable attracting body 30 is detachably attached to the tip.
[0015]
In this example, the attracting body 30 is a flat plate, and is structured so as to be tiltable in the vertical direction by its own weight by being axially attached to the distal end of the fastening fitting 28, and the attaching / detaching means of the attracting body 30 is by a screw mechanism 32. It is.
[0016]
In order to make it easier to tilt the attracting body 30 in the vertical direction by its own weight after inserting the attracting body 30 of the securing metal fitting 28 into the fastening hole 24 of the tunnel interior plate 18, An insertion tube 34 that is inserted and inserted into the fastening hole 24 together with the fastening hardware 24 is provided.
[0017]
By adopting this insertion tube 34, after inserting the fastening bracket 28 in advance, after inserting the insertion tube 34 together with the fastening bracket 28 into the fastening hole 24 of the tunnel interior plate 18, only the insertion tube 34 is molded. By pulling out inside the frame 16, the attracting body 30 can be easily tilted in the vertical direction by its own weight and locked to the tunnel interior plate 18.
[0018]
Further, in order to efficiently fix the tunnel interior plate 18 to the mold 16, a protruding plate 36 is disposed below the outer periphery of the mold 16 so as to be able to appear and retract.
[0019]
The projecting plate 36 is projected outward when the tunnel interior plate 18 is brought into contact with the mold 16, and then the lowermost tunnel interior plate 18 serving as a reference for the vertical position on the projecting projecting plate 36. The tunnel interior plate 18 is sequentially stacked on the tunnel interior plate 18 and the tunnel interior plate 18 is brought into contact with the mold 16 to fix the tunnel interior plates 18 to the mold 16. After completion of the work, it is housed in the formwork 16 to prepare for the second concrete laying work for the secondary lining.
[0020]
After completion of the fixing operation of the tunnel interior plate 18, the projecting plate 36 is accommodated in the mold 16 by placing the secondary lining concrete 14 with the projecting plate 36 projecting outside the mold 16. Then, after curing and curing, when the mold 16 is removed from the mold, the traces of the protruding plate 36 remain as concave portions on the concrete surface for secondary lining, which not only deteriorates the appearance but also causes a decrease in strength. This is because the concrete surface for secondary lining, which is housed in the mold 16 before placing the concrete 14 and placed, is smoothed to prevent a decrease in strength.
[0021]
Further, the fastening holes 24 of the respective tunnel interior plates 18 are penetrated at predetermined positions, and the lowermost tunnel interior plates 18 serving as the reference for the vertical position are placed on the projecting plates 36. 24 does not occur in the vertical direction, but the following adjustment mechanism 38 is provided inside the mold 16 in order to adjust the horizontal position shift of the fixing hole 24.
[0022]
A long hole 40 corresponding to the fastening hole 24 of the tunnel interior plate 18 is previously drilled in the circumferential surface of the mold 16, and an insertion hole 42 of the fastening fitting 28 is formed inside the mold 16 corresponding to the long hole 40. The adjusting mechanism 38 is configured by disposing the penetrating support plate 44 so as to be movable.
[0023]
By this adjustment mechanism 38, first, the support plate 44 is moved in the left-right direction in the long hole 40 of the mold 16 to correspond to the position of the fixing hole 24 of the tunnel interior plate 18 that is in contact with the outer peripheral surface of the mold 16. Then, after the insertion hole 42 of the support plate 44, the long hole 40 of the mold 16 and the fastening hole 24 of the tunnel interior plate 18 are matched, the fastening bracket 28 is secured to the tunnel interior plate 18 from the inside of the mold 16. It becomes possible to insert into the attachment hole 24, and the insertion into each hole 42, 40, 24 of the fastening metal fitting 28 becomes very easy.
[0024]
At this time, since the long hole 40 drilled in the outer peripheral surface of the mold 16 is completely covered by the tunnel interior plate 18 when the tunnel interior plate 18 is fixed to the mold 16, The lining concrete 14 does not enter the inside of the mold 16.
[0025]
In the figure, 46 is a seal member attached to the outer peripheral edge of each tunnel interior plate 18, 48 is a protective sheet affixed to the surface of the interior plate 22, 50 is a threaded portion formed on the outer peripheral surface of the fastening bracket 24, 52 denotes a fastening nut corresponding to the screw portion 50 of the fastening bracket 24, 54 denotes a seat plate for supporting the fastening bracket 24 on the support plate 44, and 56 denotes a tunnel inner wall surface.
[0026]
A method of attaching the tunnel interior board 18 directly to the surface of the secondary lining concrete 14 in the tunnel 12 using this apparatus will be described in detail below.
[0027]
First, the mold 16 is moved to a predetermined position in the tunnel 12.
[0028]
At this time, the tunnel pit side (the side opposite to the tunnel excavation side) of the formwork 16 is superposed with a concrete placement part (not shown) for secondary lining.
[0029]
Next, the projecting plate 36 below the outer periphery of the mold 16 is projected outward, and the tunnel interior plate 18 previously brought into the vicinity of the tunnel inner wall surface 56 in the tunnel 12 is placed on the projecting plate 36 projected. The tunnel interior board 18 is brought into contact with the outer peripheral surface of the mold 16.
[0030]
Next, the tunnel interior plates 18 are sequentially stacked on the lowermost tunnel interior plate 18 serving as a reference.
[0031]
At this time, the tunnel interior plates 18 adjacent to each other in the vertical and horizontal directions are surely sealed by the seal member 46, and the concrete lining for secondary lining 14 to be leached into the surface of the tunnel interior plate 18 and the formwork 16 Intrusion into the inside can be prevented.
[0032]
Next, the support plate 44 inside the mold 16 is moved, and the insertion hole 42 of the support plate 44 is aligned with the fastening hole 24 of each tunnel interior plate 18 that is in contact with the outer peripheral surface of the mold 16. Let
[0033]
Position adjustment work of the insertion hole 42 of the support plate 44 and the fixing hole 24 of the tunnel interior plate 18 is performed individually for each tunnel interior plate 18.
[0034]
Next, the fastening metal fitting 28 inserted into the insertion tube 34 from the inside of the mold 16 is passed through the insertion hole 42 of the support plate 44 and the long hole 40 of the mold 16 to the fastening hole 24 of the tunnel interior plate 18. After the insertion, only the insertion tube 34 is pulled out to the inside of the mold 16, and the attracting body 30 at the tip of the fastening fitting 28 is tilted in the vertical direction by its own weight and locked to the tunnel interior board 18.
[0035]
At this time, since the fastening fitting 28 is inserted into the insertion tube 34, the fastening fitting 28 can be easily inserted into the insertion hole 42, the long hole 40 and the fastening hole 24, and only the insertion tube 34 is inserted. By pulling out from the holes 44, 40, 24, the attracting body 30 at the tip of the fastening fitting 28 can be easily tilted in the vertical direction by its own weight.
[0036]
Next, the tunnel interior board 18 is brought into close contact with the outer peripheral surface of the mold 16 by drawing the tunnel interior board 18 to the inside of the mold 16 through the fastening metal 28.
[0037]
At this time, since the substrate 20 of the tunnel interior plate 18 is a flexible concrete plate, the tunnel interior plate 18 is firmly adhered to the outer peripheral surface of the mold 16, and the laid concrete lining 14 for leaching to the surface of the tunnel interior plate 18 is prevented. It can prevent more effectively.
[0038]
Next, on the inner side of the mold 16, the fastening fitting 28 is supported and fixed by screwing a fastening nut 52 onto the support plate 44 via the seat plate 54 and the screw portion 50 of the fastening fitting 28.
[0039]
Next, after completion of the fixing operation of each tunnel interior plate 18 to the mold 16, the projecting plate 36 is moved into the mold 16 in order to smooth the cast concrete surface for secondary lining and prevent the strength from being lowered. Store.
[0040]
Next, the periphery of the formwork 16 on the tunnel wife side (tunnel excavation side) is surely covered (fastened).
[0041]
Next, the concrete 14 for secondary lining is placed between the tunnel inner wall surface 56 and the mold 16 and cured and cured.
[0042]
Next, the fastening fitting 28 is separated from the attracting body 30 by releasing the screw mechanism 32 that is a means for attaching to and detaching from the leading attracting body 30.
[0043]
The reason why the attracting body 30 is separated from the front end of the fastening fitting 28 is that the attracting body 30 is buried in the secondary lining concrete 14 that has been cured and hardened together with the tunnel interior plate 18. This is because the mold 16 cannot be removed from the mold, and the mold is removed.
[0044]
The fastening member 28 from which the attracting body 30 has been separated is removed from the support plate 44, and a new attracting body 30 is attached for the next use.
[0045]
Next, the mold 16 is removed.
[0046]
At this time, since the tunnel interior plate 18 is fixed to the outer peripheral surface of the mold 16, the substrate 20 side of the tunnel interior plate 18 is placed in the secondary lining concrete 14 when the secondary lining concrete 14 is placed. After completing the curing and curing of the secondary lining concrete 14, the tunnel interior board 18 is fixed to the surface of the placed secondary lining concrete 14.
[0047]
Further, when the mold 16 is removed, the tunnel interior plate 18 fixed to the outer peripheral surface of the mold 16 is fixed to the secondary lining concrete 14 on which the substrate 20 is cured and cured, and this fixing force is strong. Therefore, the tunnel interior plate 18 is easily peeled off from the mold 16.
[0048]
Next, the protective sheet 48 on the surface side of the interior plate 22 of the tunnel interior plate 18 fixed to the surface of the secondary lining concrete 14 is removed, and the surface of the tunnel interior plate 18 is washed.
[0049]
Through the above steps, the construction of the tunnel interior board 18 is completed together with the placement of the secondary lining concrete 14 at the place where the mold 16 is installed.
[0050]
The tunnel interior plate 18 is constructed by moving the formwork 16 sequentially toward the tunnel wife side and over the entire length of the tunnel 12.
[0051]
9 to 11 show another example of the apparatus according to the present invention.
[0052]
In this example, a triangular protrusion type protruding plate 36 is arranged in a substantially lattice pattern on the outer periphery of the mold 16, and the protruding plate is in contact with the outer peripheral surface of the mold 16 of the tunnel interior plate 18. After each tunnel interior plate 18 is placed in each section 58 formed by 36, each tunnel interior plate 18 is fixed to the formwork 16 via a fixing bracket 28, and then the secondary lining concrete 14. Is to be placed.
[0053]
At this time, in the same manner as in the previous example, in order to smooth the cast concrete surface for secondary lining and prevent the strength from being lowered, after the fixing operation of the tunnel interior plate 18 to the mold 16 is completed, the protruding plate 36 is used as the mold. Although it is desirable to be able to appear and retract to be housed in 16, the projecting length of the projecting plate 36 from the mold 16 is shortened so that the tunnel interior plate 18 and the cast secondary lining when the mold is removed By taking into consideration that the damage to the concrete surface is minimized, the protruding plate 36 does not necessarily have to appear and disappear.
[0054]
Further, in this example, since the tunnel interior plate 18 is placed one by one in each section 58 formed by the protruding plate 36, the positional displacement of the tunnel interior plate 18 with respect to the vertical and horizontal directions of the mold 16 is shifted. Therefore, it is possible to accurately perform the direct placement work of the tunnel interior plate 18, and it is not necessary to provide the adjustment mechanism 38 on the mold 16 as in the previous example.
[0055]
In both examples, the tunnel interior plate 18 can be a concrete plate having no flexibility, and the interior plate 22 is not limited to a tile, and a plate material such as a wall panel can be used. Be free.
[0056]
In addition, the insertion of the fastening member 28 into the fastening hole 24 of the tunnel interior plate 18 is performed by inserting the fastening member 28 into the insertion tube 34, but the insertion tube 34 is omitted and the fastening member 28 is directly connected to the tunnel. It is obvious that it is inserted into the fastening hole 24 of the interior plate 18.
[0057]
In addition, it is obvious that the protruding plate 36 can be omitted by suspending the tunnel interior plate 18 from above the outer periphery of the mold 16 using a wire or the like.
[0058]
Further, the tunnel interior plate 18 is fixed to the outer periphery of the mold 16 by a fixing bracket 28 in which a tiltable attracting body 30 is detachably attached to the tip. By penetrating the tunnel interior plate 18 and the operator fastening the nut to the bolt between the mold 16 and the tunnel inner wall surface 56, the bolt can be used instead of the fastening bracket 28.
[0059]
In the previous example, the abutment operation of the tunnel interior plate 18 to the mold 16 utilizes the projecting plate 36 that protrudes freely below the outer periphery of the mold 16. By shortening the protrusion length from 16 and minimizing damage to the surface of the tunnel interior plate 18 and the placed concrete concrete for secondary lining when the mold is removed, the protrusion plate 36 is not necessarily It does not have to be free to appear and disappear.
[0060]
Moreover, although the fixing | fixed part of the tunnel interior board 18 to the formwork 16 is mainly the lower part of the formwork 16, it can be freely fixed to the other part of the formwork 16.
[0061]
In the following example, the protruding plate 36 is a triangular ridge shape, but may be a rectangular shape or any other shape, and is linearly arranged in the vertical and horizontal directions. It is self-evident that it is interspersed at predetermined intervals.
[0062]
Both examples are for concrete casting such as a substantially semicircular tunnel, but can also be used for circular tunnels such as underwater tunnels and sewers.
[0063]
【The invention's effect】
According to the direct placement construction method and apparatus for a tunnel interior board according to the present invention, the tunnel interior board is placed on the outer peripheral surface of the formwork for placing secondary lining concrete from the inside of the formwork. Insert a fastening bracket with a tiltable attracting body at the tip into the fastening hole, tilt the attracting body in the vertical direction by its own weight and lock it, and pull the fastening bracket toward the inside of the formwork Since the tunnel interior plate is installed at the same time as the concrete placement for the secondary lining and the tunnel interior plate is installed, it is extremely easy to fix the tunnel interior plate to the formwork. There is no need to install interior panels, and the construction period for tunnel interior panels can be greatly reduced.
[0064]
In addition, by attaching the tunnel interior board directly to the surface of the concrete for secondary lining, it is possible to eliminate the fixing bracket and sticking mortar used in the past. Not only is there no damage to the tunnel interior plate, but the number of repair work such as replacement of the fixtures and replacement of the tunnel interior plate is drastically reduced, and the burden on maintenance can be drastically reduced.
[0065]
In addition, when inserting the anchor fitting member into the fixing hole of the tunnel interior plate, the fixing bracket is inserted into the insertion hole of the tunnel interior plate by inserting the fixing bracket into the insertion tube. In addition, by pulling out only the insertion tube from the fastening hole, the attracting body of the fastening bracket can be easily tilted in the vertical direction by its own weight.
[0066]
Further, when the tunnel interior plate is brought into contact with the outer peripheral surface of the formwork, after being placed on the protruding plate disposed below the outer periphery of the formwork, the tunnel interior plates are sequentially stacked above the tunnel interior plate. After the tunnel interior plate is fixed to the formwork, the concrete for the secondary lining is placed, so that the lowermost tunnel interior plate, which serves as a reference for the vertical position, is placed on the protruding plate. There is no displacement in the vertical direction of the fastening holes of the interior plate.
[0067]
In addition, when the tunnel interior plate is brought into contact with the outer peripheral surface of the formwork, after the tunnel interior plate is placed in each section of the projecting plate disposed in a substantially lattice pattern on the outer periphery of the formwork, After fixing to the formwork, by placing concrete for secondary lining, one tunnel interior board is placed in each section formed by the projecting board, so the top, bottom, left and right direction of the formwork On the other hand, there is no misalignment of the tunnel interior plate, and the tunnel interior plate can be directly placed directly.
[0068]
In addition, by forming the tunnel interior board substrate from a flexible material, the adhesion to the outer periphery of the formwork is improved, and leaching of the placed concrete for secondary lining to the tunnel interior board surface is prevented. be able to.
[Brief description of the drawings]
FIG. 1 is an enlarged side view of an essential part showing a direct placement apparatus for a tunnel interior board according to the present invention.
FIG. 2 is a front view of the same.
FIG. 3 is a front view of a tunnel interior board.
FIG. 4 is a side view of the same.
FIG. 5 is an enlarged front view of a part A in FIG. 4;
FIG. 6 is an exploded front view of a fastening fitting and an insertion tube.
FIG. 7 is a front view showing a process of fixing a tunnel interior plate to a formwork.
FIG. 8 is a simplified front view showing a direct placement process of a tunnel interior board according to the present invention.
FIG. 9 is an enlarged front view of an essential part showing another example of a direct placement apparatus for a tunnel interior board according to the present invention.
FIG. 10 is a side view of the same.
11 is an enlarged view of portion B in FIG.
[Explanation of symbols]
12 Tunnel 14 Concrete for secondary lining 16 Form 18 Tunnel interior plate 20 Substrate 22 Interior plate 24 Support hole 28 Fastening fitting 30 Insertion body 34 Insertion tube 36 Projection plate 56 Tunnel inner wall surface 58 Section

Claims

In the method of attaching the tunnel interior plate (18) to the surface of the concrete (14) for secondary lining placed in the tunnel (12),
A large number of interior plates (22) are fixed to the substrate (20) on the outer peripheral surface of the formwork (16) for placing the concrete (14) for secondary lining in the tunnel (12), and the substrate (20) The tunnel interior plate (18) with the fastening hole (24) penetrated in place, the surface of the tunnel interior plate (18) abuts the formwork (16), and the tunnel interior plate (18) is secured. After inserting the attracting body (30) of the fastening bracket (28) with the tiltable attracting body (30) detachably attached to the tip from the inside of the mold (16) into the hole (24), pull it Tilt the body (30) in the vertical direction by its own weight and lock it to the tunnel interior plate (18), and pull the fastening bracket (28) to the inside of the formwork (16) to mold the tunnel interior plate (18). After closely attaching to the frame (16), after fixing the tunnel interior plate (18) to the formwork (16) by fixing the fastening bracket (28) to the inside of the formwork (16),
After placing the concrete for secondary lining (14) through the formwork (16) in the tunnel (12), curing the secondary lining concrete (14),
The attracting body (30) is separated from the tip of the fastening bracket (28) and the formwork (16) is removed from the mold so that the attracting body (30) is embedded in the concrete for secondary lining (14). In addition, the tunnel interior board direct installation method, characterized in that the tunnel interior board (18) is directly attached to the surface of the secondary lining concrete (14).

When inserting the attachment (30) of the fastening bracket (28) from the inside of the mold (16) into the fastening hole (24) of the tunnel interior plate (18), the fastening bracket (28) is inserted into the insertion tube (34 ), The insertion body (30) together with the insertion tube (34) is inserted into the fastening hole (24) of the tunnel interior plate (18), and then only the insertion tube (34) is inserted into the tunnel interior plate. The tunnel interior board direct placing method according to claim 1, wherein the attracting body (30) is tilted in the vertical direction by its own weight by being pulled out from the fastening hole (24) of (18).

In contact of the tunnel interior plate (18) with the outer peripheral surface of the mold (12), the tunnel interior plate (18) was placed on the protruding plate (36) disposed below the outer periphery of the mold (16). After that, the tunnel interior plates (18) are sequentially stacked above the tunnel interior plate (18), and after each tunnel interior plate (18) is fixed to the formwork (16), the concrete for secondary lining (14) is attached. 3. The direct placement construction method for a tunnel interior board according to claim 1 or 2, wherein the direct placement construction method is performed.

When the tunnel interior plate (18) is in contact with the outer peripheral surface of the mold (12), the tunnel interior is placed in each section (58) of the projecting plate (36) arranged in a substantially lattice pattern on the outer periphery of the mold (16). After placing the plate (18), after each tunnel interior plate (18) is fixed to the formwork (16), concrete for secondary lining (14) is placed. Or the direct placement construction method of the tunnel interior board of Claim 2.

Tunnel interior of secondary lining concrete (14), which is formed by molding the substrate (20) of the tunnel interior plate (18) with a flexible material to improve the adhesion to the outer periphery of the formwork (16) 5. The direct installation method for a tunnel interior board according to claim 1, 2, 3, 4 or 4, wherein leaching to the surface of the board (18) is prevented.

In the device for attaching the tunnel interior plate (18) to the surface of the concrete (14) for secondary lining placed in the tunnel (12),
A tunnel interior plate (18) in which a large number of interior plates (22) are fixed to the substrate (20), and a fastening hole (24) is passed through an appropriate position of the substrate (20);
A fastening bracket (28) with a freely tiltable attracting body (30) attached to the tip;
A formwork (16) for placing secondary lining concrete (14) in the tunnel (12),
The tunnel interior plate (18) is placed on the outer peripheral surface of the formwork (16) for placing the secondary lining concrete (14) in the tunnel (12), and the surface of the tunnel interior plate (18) is placed on the formwork (16 ), And after inserting the attracting body (30) of the fastening bracket (28) from the inside of the mold (16) into the fastening hole (24) of the tunnel interior plate (18), the attracting body (30 ) Is tilted in the vertical direction by its own weight and locked to the tunnel interior plate (18), and the fastening bracket (28) is pulled inside the formwork (16) to bring the tunnel interior plate (18) into the formwork (16). After fixing the tunnel interior plate (18) to the formwork (16) by fixing the fastening bracket (28) to the inside of the formwork (16),
After placing the concrete for secondary lining (14) in the tunnel (12) through the formwork (16), curing the secondary lining concrete (14),
The attracting body (30) is separated from the tip of the fastening bracket (28) and the formwork (16) is removed from the mold so that the attracting body (30) is embedded in the concrete for secondary lining (14). And a tunnel interior board direct placement device, wherein the tunnel interior board (18) is directly attached to the surface of the secondary lining concrete (14).

When inserting the attachment (30) of the fastening bracket (28) from the inside of the mold (16) into the fastening hole (24) of the tunnel interior plate (18), the fastening bracket (28) is inserted into the insertion tube (34 ), The insertion body (30) together with the insertion tube (34) is inserted into the fastening hole (24) of the tunnel interior plate (18), and then only the insertion tube (34) is inserted into the tunnel interior plate. The direct placement device for a tunnel interior board according to claim 6, wherein the attracting body (30) is tilted in the vertical direction by its own weight by being pulled out from the fastening hole (24) of (18).

In contact of the tunnel interior plate (18) with the outer peripheral surface of the mold (16), the tunnel interior plate (18) was placed on the protruding plate (36) disposed below the outer periphery of the mold (16). After that, the tunnel interior plates (18) are sequentially stacked above the tunnel interior plate (18), and after each tunnel interior plate (18) is fixed to the formwork (16), the concrete for secondary lining (14) is attached. The direct placement apparatus for a tunnel interior board according to claim 6 or 7, wherein the direct placement apparatus is for placement.

When the tunnel interior plate (18) is in contact with the outer peripheral surface of the mold (12), the tunnel interior is placed in each section (58) of the projecting plate (36) arranged in a substantially lattice pattern on the outer periphery of the mold (16). 7. After placing the plate (18), after fixing each tunnel interior plate (18) to the formwork (16), the concrete for secondary lining (14) is placed. Or the direct placement apparatus of the tunnel interior board of Claim 7.

Tunnel interior of secondary lining concrete (14), which is formed by molding the substrate (20) of the tunnel interior plate (18) with a flexible material to improve the adhesion to the outer periphery of the formwork (16) The direct placement apparatus for tunnel interior boards according to claim 6, 7, 8, or 9, characterized in that leaching to the surface of the board (18) is prevented.