JP4348108B2

JP4348108B2 - Bridge replacement method and bridge

Info

Publication number: JP4348108B2
Application number: JP2003125177A
Authority: JP
Inventors: 伊知郎増田; 眞二中谷; 茂永谷; 俊蔵岡
Original assignee: Mitsubishi Heavy Industries Bridge and Steel Structures Engineering Co Ltd
Current assignee: MM Bridge Co Ltd
Priority date: 2003-04-30
Filing date: 2003-04-30
Publication date: 2009-10-21
Anticipated expiration: 2023-04-30
Also published as: JP2004332222A

Description

【０００１】
【発明の属する技術分野】
本発明は、橋梁の架替工法、およびその架替工法により構築された橋梁に関する。
【０００２】
【従来の技術】
経年変化や交通量の増加等により耐用期間が満了に近づいた橋梁の架け替えを行う場合、その方法としては、隣り合う２つの橋脚間において新規橋桁を構築し、この新規橋桁を支保工昇降機構を用いて上方へ移動させ、新規橋桁に旧橋桁の荷重を支持させた状態で旧橋桁を橋体から切り離し、新たに新規橋桁を２つの橋脚に支承させ、新規橋桁上で旧橋桁を解体、撤去する例がある（下記の特許文献１）。
その他の方法としては、隣り合う２つの橋脚間にジャッキを配置し、このジャッキを用いて既設橋桁を下方から支持した状態で、既設橋桁上において新設橋桁を構築し、新設橋桁が完成したらジャッキにより既設、新設の両橋桁を降下させ、新設橋桁を２つの橋脚に支承させ、既設橋桁のみさらに降下させて撤去する例がある（下記の特許文献２）。
【０００３】
【特許文献１】
特開平１１−１９０００８号公報
【特許文献２】
特開２００３−３４９１１号公報
【０００４】
【発明が解決しようとする課題】
新規橋桁を上方に移動させ、旧橋桁と入れ替える先の例では、新規橋桁が両側の橋桁と同じ高さとなったところで、別個に用意した継ぎブロックを橋桁上に搬入し、この継ぎブロックを新規橋桁と両側の橋桁との間に挿入して新規橋桁を両側の橋桁と接合し、橋脚に新規橋桁を支承させている。この工法では、新規橋桁を構築する間は旧橋桁上の通行が可能であるが、継ぎブロックを用いた橋桁の接合作業に手間が掛かる。この作業の間は旧橋桁上の通行が不可能であり、長期に渡って橋梁の利用が不可能になるために周辺地域に社会的、経済的に大きな損失を与えることになる。
【０００５】
新設橋桁を降下させ、既設橋桁と入れ替える後の例では、新設橋桁を当初から２つの橋脚間に架設できる長さに構築し、ジャッキにより既設、新設の両橋桁を降下させる際に既設橋桁の両端を切除し、２つの橋脚間に既設橋桁を落とし込ませている。この工法では、新設橋桁を既設橋桁上で構築するため、新設橋桁の構築を開始してから既設橋桁との入れ替えを終えるまで既設橋桁上の通行が不可能であり、先の例以上に周辺地域に社会的、経済的に大きな損失を与えることになる。
【０００６】
本発明は上記の事情に鑑みてなされたものであり、橋桁の架け替えに要する期間を短縮することにより周辺地域が被る社会的、経済的な損失を軽減させることを目的としている。
【０００７】
【課題を解決するための手段】
上記の課題を解決するための手段として、次のような構成の橋梁の架替工法、および橋梁を採用する。すなわち本発明に係る橋梁の架替工法は、隣り合う２つの橋脚間にあってかつ既存の上部構造物の下方に配置したジャッキ上に、橋軸方向の長さが可変な構造を有する新設の分割された上部構造物を、前記橋軸方向に短縮した状態で配置し、前記ジャッキを上方に伸長することで、前記２つの橋脚間に架設された既存の上部構造物を前記新設の分割された上部構造物で押し上げて前記２つの橋脚から分離し、前記既存の上部構造物を撤去する前、または撤去した後に、前記新設の分割された上部構造物を前記橋軸方向に伸長し一体化して前記２つの橋脚間に架設することを特徴とする。
【０００８】
本発明に係る橋梁の架替工法は、隣り合う２つの橋脚間にあってかつ既存の上部構造物の下方に配置したジャッキ上に、橋軸方向に複数に分割された新設の上部構造物を、個々の分割体を積み重ねた状態で配置し、前記ジャッキを上方に伸長することで、前記２つの橋脚間に架設された既存の上部構造物を前記新設の上部構造物で押し上げて前記２つの橋脚から分離し、前記既存の上部構造物を利用して前記個々の分割体を前記橋軸方向に配列し、配列された前記個々の分割体を結合し前記新設の上部構造物として一体化して前記２つの橋脚間に架設することを特徴とする。
【０００９】
本発明に係る橋梁は、隣り合う２つの橋脚間にあってかつ既存の上部構造物の下方に配置したジャッキ上に、橋軸方向の長さが可変な構造を有する新設の上部構造物を、前記橋軸方向に短縮した状態で配置し、前記ジャッキを上方に伸長することで、前記２つの橋脚間に架設された既存の上部構造物を前記新設の上部構造物で押し上げて前記２つの橋脚から分離し、前記既存の上部構造物を撤去する前、または撤去した後に、前記新設の上部構造物を前記橋軸方向に伸長して前記２つの橋脚間に架設したことを特徴とする。
【００１０】
本発明に係る橋梁は、隣り合う２つの橋脚間にあってかつ既存の上部構造物の下方に配置したジャッキ上に、橋軸方向に複数に分割された新設の上部構造物を、個々の分割体を積み重ねた状態で配置し、前記ジャッキを上方に伸長することで、前記２つの橋脚間に架設された既存の上部構造物を前記新設の上部構造物で押し上げて前記２つの橋脚から分離し、前記既存の上部構造物を利用して前記個々の分割体を前記橋軸方向に配列し、配列された前記個々の分割体を結合し前記新設の上部構造物として一体化して前記２つの橋脚間に架設したことを特徴とする。
【００１１】
本発明に係る橋梁の上部構造物は、隣り合う２つの橋脚間にあってかつ既存の上部構造物の下方に配置したジャッキ上に、隣り合う前記２つの橋脚間に架設される橋梁の上部構造物であって、橋軸方向に複数に分割され、隣り合う分割体どうしが上面でヒンジ連結されて前記橋軸方向の長さが可変な構造を有する新設の分割された上部構造物を、前記橋軸方向に短縮した状態で配置し、前記ジャッキを上方に伸長することで、前記２つの橋脚間に架設された前記既存の上部構造物を前記新設の分割された上部構造物で押し上げて前記２つの橋脚から分離し、前記既存の上部構造物を撤去する前、または撤去した後に、前記新設の分割された上部構造物を前記橋軸方向に伸長し一体化して前記２つの橋脚間に架設したことを特徴とする。
【００１２】
本発明においては、長さを短縮した新設の上部構造物を上方に移動させて既設の上部構造物と入れ替え、既存の上部構造物を撤去する前、または撤去した後に伸長し、隣り合う２つの橋脚間に架設する。本発明によれば、新設の上部構造物を橋軸方向の長さが可変な構造とすることにより、新設の上部構造物の架設作業が短期間のうちに行えるようになるので、橋梁を利用できなくなる期間が短くて済み、周辺地域が被る社会的、経済的な損失を軽減させることができる。
【００１３】
本発明においては、新設の上部構造物を橋軸方向に複数に分割するとともに隣り合う分割体どうしをヒンジ連結することで橋軸方向に長さが可変な構造とし、既存の上部構造物を撤去した後に、新設の上部構造物を橋軸方向に伸長して２つの橋脚間に架設することが望ましい。新設の上部構造物を橋軸方向に複数に分割し、隣り合う分割体どうしをヒンジ連結することにより、新設の上部構造物を長さが可変な構造とすることが非常に簡易に、かつ安価に実現されるので、架設作業の効率化ならびに施工コストの削減が図れる。
【００１４】
本発明においては、個々の分割体を積み重ねた状態で配置した新設の上部構造物を上方に移動させて既設の上部構造物と入れ替え、既存の上部構造物を利用して個々の分割体を前記橋軸方向に配列し、配列された個々の分割体を結合し新設の上部構造物として一体化して２つの橋脚間に架設する。本発明によれば、新設の上部構造物を個々の分割体に分け、個々の分割体を既存の上部構造物を利用して橋軸方向に配列することにより、新設の上部構造物の架設作業が短期間のうちに行えるようになるので、橋梁を利用できなくなる期間が短くて済み、周辺地域が被る社会的、経済的な損失を軽減させることができる。
【００１５】
本発明においては、既存の上部構造物に軌道を取り付け、軌道に沿って個々の分割体を橋軸方向に移動させることが望ましい。既存の上部構造物に取り付けた軌道に沿って個々の分割体を移動させることにより、分割体の配列作業が行い易くなるので、架設作業の効率化ならびに施工コストの削減が図れる。
【００１６】
本発明においては、橋脚を当初は高さ方向に複数に分割しておき、個々の分割体を、より上端近くに設置すべきものがひとつずつ上方に移動するように積み重ねて構築することが望ましい。このようにすれば橋脚をジャッキとして利用して上部構造物の架け替えと同時に橋脚の再構築も可能になるので、橋梁の全面的な架替工事に関して作業の効率化ならびに施工コストの削減が図れる。
【００１７】
【発明の実施の形態】
本発明に係る第１の実施形態を図１ないし図３に示して説明する。
図１には、両端部を折り畳むことで橋軸方向の長さを変化させることができる上部構造物１を示している。上部構造物１は、橋桁２と床版３とが一体化されたもので、橋軸方向に３つに分割されており、各分割体のうち主体となる中間部４の橋軸方向の両側に、端部５，６がヒンジ部７を介してそれぞれ連結されている。端部５，６は、いずれもヒンジ部７を中心として中間部４の上面側にほぼ１８０°回動することができ、この状態では中間部４上に端部５，６が載置されることになる。
【００１８】
上記のように構成された上部構造物を用いて行う橋梁の架替工法を図２、図３を参照して説明する。
まず、図２（ａ）に示すように、隣り合う２つの橋脚１０，１０間に、橋軸方向に離間させて複数の大型ジャッキ１１を配置する。大型ジャッキ１１はいずれも短縮させておく。短縮させた大型ジャッキ１１上に、図１に示した新設の上部構造物１を、両端部５，６を中間部４上に折り畳んで橋軸方向の長さを短縮した状態で配置する。折り畳んだ新設の上部構造物１上には、シンクロジャッキ１２およびローラ架台１３を配置しておく。
【００１９】
次に、図２（ｂ）に示すように、大型ジャッキ１１を伸長し、橋脚１０，１０間に架設された既設の上部構造物１４を、シンクロジャッキ１２およびローラ架台１３を介して新設の上部構造物１上に支持する。続けて大型ジャッキ１１を伸長し、既存の上部構造物１４を新設の上部構造物１で押し上げて橋脚１０から分離する。さらに大型ジャッキ１１の伸長を続け、新設の上部構造物１を両側の上部構造物１４’と同じ高さにまで上昇させる。なお、既設の上部構造物１４を橋脚１０や両側の上部構造物１４’に固定していた連結ボルト等の締着手段（図示略）は事前に撤去しておく。
【００２０】
新設の上部構造物１を両側の上部構造物１４’と同じ高さにまで上昇させたら、図２（ｃ）に示すように、新設の上部構造物１上でシンクロジャッキ１２を駆動し、既設の上部構造物１４を橋軸方向の一方に移動させる。新設の上部構造物１上で可能な限りシンクロジャッキ１２を移動させたら、シンクロジャッキ１２を短縮し、既設の上部構造物１４をローラ架台１３のみで支持した状態としたうえで、シンクロジャッキ１２を橋軸方向の他方に移動させる。シンクロジャッキ１２を伸長して既設の上部構造物１４を支持し、再びシンクロジャッキ１２を駆動し、既設の上部構造物１４を橋軸方向の一方に移動させる。この作業を何度か繰り返し、必要になれば橋軸方向の一方に位置する上部構造物１４’上にもシンクロジャッキ１２を配置して撤去すべき既存の上部構造物１４を支持する。
【００２１】
次に、図３（ａ）に示すように、上部構造物１４’上にトレーラ１５を配置し、このトレーラ１５上に既存の上部構造物１４の一端を順次送り出す。トレーラ１５上に架かった既存の上部構造物１４が適当な長さになったら、この部分をカッターで切断してトレーラ１５に載せ、橋梁上から撤去する。残った部分についても上記と同様の作業を繰り返して切断、撤去する。
【００２２】
既設の上部構造物１４をすべて撤去したら、図３（ｂ）に示すように、大型ジャッキ１１を伸長させて新設の上部構造物１をもう一段階上昇させたうえで、両側の上部構造物１４’上にそれぞれトラッククレーン１６を配置し、新設の上部構造物１の折り畳んでいた両端部５，６をトラッククレーン１６で吊り上げるようにして展開させる。両端部５，６を展開させたら、大型ジャッキ１１を短縮させて新設の上部構造物１を一段階降下させたうえで、連結ボルト等の締着手段（図示略）を用いて新設の上部構造物１と両側の上部構造物１４’、さらにこれら構造物と橋脚１０とを締着する。
【００２３】
各部を締着して十分な強度が確保できたら、新設の上部構造物１からヒンジ部分（図示略）を撤去するとともに、図３（ｃ）に示すように大型ジャッキ１１を短縮、撤去して架替工事を完了する。これにより、橋脚１０，１０間に新設の上部構造物１が架設される。以降は隣接する既設の上部構造物１４’についても続けて同様の架替作業を行う。
【００２４】
本実施形態の架替工法によれば、新設の上部構造物１を橋軸方向の長さが可変な構造とすることにより、上部構造物１の架設作業が短期間のうちに行えるようになるので、橋梁を利用できなくなる期間が短くて済み、周辺地域が被る社会的、経済的な損失を軽減させることができる。
【００２５】
また、新設の上部構造物１を橋軸方向に複数に分割し、隣り合う分割体（中間体４，端部５，６）どうしをヒンジ連結することにより、上部構造物１を長さが可変な構造とすることが非常に簡易に、かつ安価に実現されるので、架設作業の効率化ならびに施工コストの削減が可能である。
【００２６】
なお、本実施形態においては既設の上部構造物１４を撤去した後に新設の上部構造物１を展開しているが、既設の上部構造物１４を撤去する前に新設の上部構造物１を展開するようにしてもよい。
【００２７】
次に、本発明に係る第２の実施形態を図４から図６に示して説明する。なお、上記実施形態において既に説明した構成要素には同一符号を付して説明は省略する。
本実施形態において、新設する上部構造物１はヒンジ連結されておらず、単に橋軸方向に複数に分割されているだけである。このような上部構造物を用いて行う橋梁の架替工法を図４から図６を参照して説明する。
まず、図４（ａ）に示すように、隣り合う２つの橋脚１０，１０間に、橋軸方向に離間させて複数の大型ジャッキ１１を配置する。大型ジャッキ１１はいずれも短縮させておく。短縮させた大型ジャッキ１１上に、新設の上部構造物１を、両端部５，６を中間部４上に積み重ねた状態で配置する。新設の上部構造物１上には、シンクロジャッキ１２、ローラ架台１３および小型ジャッキ１９を配置し、さらにシンクロジャッキ１２およびローラ架台１３の上に複数本のガイドレール（軌道）２０を橋軸方向に沿って並べて仮置きしておく。
【００２８】
次に、図４（ｂ）に示すように、大型ジャッキ１１を伸長し、橋脚１０，１０間に架設された既設の上部構造物１４の下面にガイドレール２０を沿わせる。既設の上部構造物１４の下面にガイドレール２０を沿わせたら、シンクロジャッキ１２を駆動し、２本のガイドレール２０を橋軸方向の相反する方向にそれぞれ移動させる。新設の上部構造物１上で可能な限りシンクロジャッキ１２を移動させ、２本のガイドレール２０の端部を既存の上部構造物１４の両端部に達するまで移動させたら、図４（ｃ）に示すように、既設の上部構造物１４の下面にガイドレール２０を固定する。
【００２９】
既設の上部構造物１４の下面にガイドレール２０を固定したら、再び大型ジャッキ１１を伸長し、既存の上部構造物１４を新設の上部構造物１で押し上げて橋脚１０から分離する。さらに大型ジャッキ１１の伸長を続け、図５（ａ）に示すように、新設の上部構造物１を両側の上部構造物１４’と同じ高さにまで上昇させる。なお、既設の上部構造物１４を橋脚１０や両側の上部構造物１４’に固定していた連結ボルト等の締着手段（図示略）は事前に撤去しておく。
【００３０】
新設の上部構造物１を両側の上部構造物１４’と同じ高さにまで上昇させたら、図５（ｂ）に示すように、新設の上部構造物１の両端部５，６を、ガイドレール２０に吊り下げ、橋脚１０側に移動させる。なお、両端部５，６の移動は、シンクロジャッキ１２に支持された既設の上部構造物１４のバランスを崩さないように両方で同時進行させることが望ましい。
【００３１】
新設の上部構造物１の両端部５，６を、中間部４と両側の上部構造物１４’との間隙上にそれぞれ移動させたら、図５（ｃ）に示すように、両端部を吊り降ろして間隙２１に填め込み、連結ボルト等の締着手段（図示略）を用いて中間部や両側の上部構造物１４’、さらに橋脚１０に締着する。
【００３２】
各部を締着して十分な強度が確保できたら、図６（ａ）に示すように、両側の上部構造物１４’上から新設の上部構造物１上にトレーラ１５をそれぞれ配置し、各トレーラ１５上に既存の上部構造物１４の端部を差し掛けるように配置する。シンクロジャッキ１２および小型ジャッキ１９を短縮し、既存の上部構造物１４を各トレーラ１５に支持させる。既存の上部構造物１４のトレーラ１５上に差し掛かった部分をカッターで切断してトレーラ１５に載せ、トレーラ１５を牽引して橋梁上から撤去する。残った部分については、図６（ｂ）に示すように、シンクロジャッキ１２および小型ジャッキ１９を盛り代えて支持しておき、後に別のトレーラ１５に載せて撤去する。
【００３３】
既設の上部構造物１４をすべて撤去したら、図６（ｃ）に示すように大型ジャッキ１１を短縮、撤去して架替工事を完了する。これにより、橋脚１０，１０間に新設の上部構造物１が架設される。以降は隣接する既設の上部構造物１４’についても続けて同様の架替作業を行う。
【００３４】
本実施形態の架替工法によれば、新設の上部構造物１を複数に分割し、両端部５，６を既存の上部構造物１４を利用して橋軸方向に配列することにより、新設の上部構造物１の架設作業が短期間のうちに行えるようになるので、橋梁を利用できなくなる期間が短くて済み、周辺地域が被る社会的、経済的な損失を軽減させることができる。
【００３５】
また、既存の上部構造物１４に取り付けたガイドレール２０に沿って両端部５，６を移動させることにより、両端部５，６の配列作業が行い易くなるので、架設作業の効率化ならびに施工コストの削減が可能である。
【００３６】
次に、本発明に係る第３の実施形態を図７から図９に示して説明する。なお、上記実施形態において既に説明した構成要素には同一符号を付して説明は省略する。
本実施形態においては、両端部５，６を折り畳むことができる上部構造物１Ａと、一方の端部６のみ折り畳むことができる上部構造物１Ｂの２つを用いる。また、ジャッキアップ式の橋脚３０を用いる。ジャッキアップ式の橋脚３０は、図７に示すように、高さ方向にほぼ等しい長さで複数に分割されており、個々の分割体３１が、より上端近くに設置すべきものをひとつずつ上方に移動させるように下端側から積み重ねられて構築される。橋脚３０を支持する基礎３２上には、積み上げた分割体３１を分割体３１ひとつ分持ち上げるための支保工３３が設置され、個々の分割体３１には、支保工３３に沿って自らを上方に押し上げるスライドジャッキ３４が設けられている。
このような上部構造物１Ａ，１Ｂ、およびジャッキアップ式の橋脚３０を用いて行う橋梁の架替工法を図８、図９を参照して説明する。
【００３７】
まず、図８（ａ）に示すように、橋軸方向に並ぶ３つの橋脚１０Ａ，１０Ｂ，１０Ｃのうち、隣り合う橋脚１０Ａ，１０Ｂのそれぞれに隣接させて基礎３２を構築し、この基礎３２にジャッキアップ式の橋脚３０を構築するとともに、隣り合う橋脚１０Ｂ，１０Ｃのそれぞれに隣接させて大型ジャッキ１１を配置する。ジャッキアップ式の橋脚３０は最も短い分割体３１ひとつ分の高さとし、大型ジャッキ１１はいずれも短縮させておく。ジャッキアップ式の橋脚３０および大型ジャッキ１１上に、新設の上部構造物１Ａ，１Ｂを、各端部５，６を折り畳んで橋軸方向の長さを短縮した状態で配置する。折り畳んだ新設の上部構造物１Ａ，１Ｂ上には、シンクロジャッキ１２およびローラ架台１３を配置しておく。
【００３８】
次に、図８（ｂ）に示すように、ジャッキアップ式の橋脚３０および大型ジャッキ１１を伸長し、橋脚１０Ａ〜１０Ｃ間に架設された既設の上部構造物１４を、シンクロジャッキ１２およびローラ架台１３を介して新設の上部構造物１Ａ，１Ｂ上に支持する。続けてジャッキアップ式の橋脚３０および大型ジャッキ１１を伸長し、既存の上部構造物１４を新設の上部構造物１Ａ，１Ｂで押し上げて橋脚１０から分離する。さらにジャッキアップ式の橋脚３０および大型ジャッキ１１の伸長を続け、新設の上部構造物１Ａ，１Ｂを両側の上部構造物１４’と同じ高さにまで上昇させる。なお、既設の上部構造物１４を橋脚１０Ａ，１０Ｂ，１０Ｃや両側の上部構造物１４’に固定していた連結ボルト等の締着手段（図示略）は事前に撤去しておく。
【００３９】
新設の上部構造物１を両側の上部構造物１４’と同じ高さにまで上昇させたら、図８（ｃ）に示すように、新設の上部構造物１Ａ，１Ｂ上でシンクロジャッキ１２を駆動し、既設の上部構造物１４を橋軸方向の一方に移動させる。新設の上部構造物１Ａ，１Ｂ上で可能な限りシンクロジャッキ１２を移動させたら、シンクロジャッキ１２を短縮し、既設の上部構造物１４をローラ架台１３のみで支持した状態としたうえで、シンクロジャッキ１２を橋軸方向の他方に移動させる。シンクロジャッキ１２を伸長して既設の上部構造物１４を支持し、再びシンクロジャッキ１２を駆動し、既設の上部構造物１４を橋軸方向の一方に移動させる。
【００４０】
次に、図９（ａ）に示すように、上部構造物１４’上にトレーラ１５を配置し、このトレーラ１５上に既存の上部構造物１４の一端を順次送り出す。トレーラ１５上に架かった既存の上部構造物１４が適当な長さになったら、この部分をカッターで切断してトレーラ１５に載せ、橋梁上から撤去する。残った部分についても上記と同様の作業を繰り返して切断、撤去する。
【００４１】
既設の上部構造物１４をすべて撤去したら、図９（ｂ）に示すように、ジャッキアップ式の橋脚３０および大型ジャッキ１１を伸長させて新設の上部構造物１をもう一段階上昇させたうえで、両側の上部構造物１４’上にそれぞれトラッククレーン１６を配置し、新設の上部構造物１Ａ，１Ｂの折り畳んでいた各端部５，６をトラッククレーン１６で吊り上げるようにして展開させる。各端部５，６を展開させたら、ジャッキアップ式の橋脚３０および大型ジャッキ１１を短縮させて新設の上部構造物１Ａ，１Ｂを一段階降下させる。
【００４２】
新設の上部構造物１Ａ，１Ｂの各部を連結ボルトで締着して十分な強度が確保できたら、新設の上部構造物１Ａ，１Ｂからヒンジ部分（図示略）を撤去するとともに、図９（ｃ）に示すように、大型ジャッキ１１および既設の橋脚１０Ａ，１０Ｂを撤去して架替工事を完了する。これにより、橋軸方向に並ぶ３つの橋脚３０，３０，１０Ｃ間に新設の上部構造物１Ａ，１Ｂが架設される。以降は隣接する既設の上部構造物１４’についても続けて同様の架替作業を行う。
【００４３】
本実施形態の架替工法によれば、橋脚をジャッキとして利用して上部構造物の架け替えと同時に橋脚の再構築も可能になるので、橋梁の全面的な架替工事に関して作業の効率化ならびに施工コストの削減が可能である。
【００４４】
なお、本実施形態においては、上部構造物に上記第１の実施形態のようなヒンジ連結による長さの可変構造を与えたが、これに代えて上部構造物に上記第２の実施形態のようなガイドレールによる長さの可変構造を与えてもよい。
また、本実施形態においては、上部構造物の架け替えに併せて橋脚の再構築を行ったが、上部構造物はそのまま使用し、橋脚だけを再構築する場合もある。
【００４５】
【発明の効果】
以上説明したように、本発明によれば、新設の上部構造物を橋軸方向に長さの可変な構造とすることにより、新設の上部構造物の架設作業が短期間のうちに行えるようになるので、橋梁を利用できなくなる期間が短くて済み、周辺地域が被る社会的、経済的な損失を軽減させることができる。
【００４６】
本発明によれば、新設の上部構造物を橋軸方向に複数に分割し、隣り合う分割体どうしをヒンジ連結することにより、新設の上部構造物を長さの可変な構造とすることが非常に簡易に、かつ安価に実現されるので、架設作業の効率化ならびに施工コストの削減が可能である。
【００４７】
本発明によれば、新設の上部構造物を個々の分割体に分け、個々の分割体を既存の上部構造物を利用して橋軸方向に配列することにより、新設の上部構造物の架設作業が短期間のうちに行えるようになるので、橋梁を利用できなくなる期間が短くて済み、周辺地域が被る社会的、経済的な損失を軽減させることができる。
【００４８】
本発明によれば、既存の上部構造物に取り付けた軌道に沿って個々の分割体を移動させることにより、分割体の配列作業が行い易くなるので、架設作業の効率化ならびに施工コストの削減が可能である。
【００４９】
本発明によれば、橋脚をジャッキとして利用して上部構造物の架け替えと同時に橋脚の再構築も可能になるので、橋梁の全面的な架替工事に関して作業の効率化ならびに施工コストの削減が可能である。
【図面の簡単な説明】
【図１】本発明に係る第１の実施形態を示す図であって、橋軸方向の長さが可変な構造を与えられた上部構造物を示す側面図である。
【図２】第１の実施形態における橋梁の架替工法を説明するための段階的な状態図である。
【図３】同じく、第１の実施形態における橋梁の架替工法を説明するための段階的な状態図である。
【図４】本発明に係る第２の実施形態を示す図であって、橋梁の架替工法を説明するための段階的な状態図である。
【図５】同じく、第２の実施形態における橋梁の架替工法を説明するための段階的な状態図である。
【図６】同じく、第２の実施形態における橋梁の架替工法を説明するための段階的な状態図である。
【図７】本発明に係る第３の実施形態を示す図であって、ジャッキアップ式の橋脚の構造を示す側面図である。
【図８】第３の実施形態における橋梁の架替工法を説明するための段階的な状態図である。
【図９】同じく、第３の実施形態における橋梁の架替工法を説明するための段階的な状態図である。
【符号の説明】
１新設の上部構造物
２橋桁
３床版
４中間部
５，６端部
７ヒンジ部
１０橋脚
１１大型ジャッキ
１２シンクロジャッキ
１３ローラ架台
１４既設の上部構造物
１５トレーラ
１９小型ジャッキ
２０ガイドレール（軌道）
２１間隙
３０ジャッキアップ式の橋脚
３１個々の分割体
３２基礎
３３支保工
３４スライドジャッキ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bridge replacement method and a bridge constructed by the replacement method.
[0002]
[Prior art]
When replacing a bridge that has reached the end of its useful life due to secular change or increased traffic, a new bridge girder is constructed between two adjacent piers, and this new bridge girder is supported by a lifting mechanism. The old bridge girder is detached from the bridge body with the new bridge girder supporting the load of the old bridge girder, the new bridge girder is supported on the two piers, and the old bridge girder is disassembled on the new bridge girder, There is an example of removal (Patent Document 1 below).
As another method, a jack is placed between two adjacent piers, and the existing bridge girder is supported from below using this jack, and a new bridge girder is constructed on the existing bridge girder. There is an example in which both existing and new bridge girders are lowered, the new bridge girders are supported on two piers, and only the existing bridge girders are further lowered and removed (Patent Document 2 below).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-190008
[Patent Document 2]
JP 2003-34911 A
[0004]
[Problems to be solved by the invention]
In the previous example where the new bridge girder is moved upward and replaced with the old bridge girder, when the new bridge girder is at the same height as the bridge girder on both sides, a separately prepared joint block is carried onto the bridge girder, and this joint block is moved to the new bridge girder. Is inserted between the bridge girder on both sides and the new bridge girder is joined to the bridge girder on both sides, and the new bridge girder is supported on the pier. In this method, while the new bridge girder is constructed, it is possible to pass on the old bridge girder, but it takes time to join the bridge girder using the joint block. During this work, traffic on the old bridge girder is impossible, and the use of the bridge over a long period of time becomes impossible, resulting in a large social and economic loss in the surrounding area.
[0005]
In the example after the new bridge girder is lowered and replaced with the existing bridge girder, the new bridge girder is constructed to a length that can be installed between the two piers from the beginning, and both ends of the existing bridge girder are lowered when the existing and new bridge girder are lowered with a jack. The existing bridge girder is dropped between the two piers. In this construction method, since the new bridge girder is built on the existing bridge girder, it is impossible to pass on the existing bridge girder from the start of construction of the new bridge girder until the replacement with the existing bridge girder. Will cause great social and economic losses.
[0006]
This invention is made | formed in view of said situation, and it aims at reducing the social and economical loss which a surrounding area suffers by shortening the period required for bridge girder replacement.
[0007]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, a bridge replacement method and a bridge having the following configuration are adopted. That is, the bridge replacement method according to the present invention is a new construction having a structure in which the length in the bridge axis direction is variable on a jack located between two adjacent piers and below an existing superstructure. Divided The upper structure is arranged in a state shortened in the bridge axis direction, and the jack is extended upward, so that the existing upper structure constructed between the two bridge piers is installed in the newly installed structure. Divided It is pushed up by the superstructure and separated from the two piers, and the new superstructure is installed before or after the existing superstructure is removed. Divided Extend the superstructure in the direction of the bridge axis Integrated It is constructed between the two bridge piers.
[0008]
In the bridge replacement method according to the present invention, a new upper structure divided into a plurality of pieces in the bridge axis direction is individually placed on a jack located between two adjacent piers and below the existing upper structure. Are arranged in a stacked state, and by extending the jack upward, the existing upper structure constructed between the two piers is pushed up by the new upper structure, and the two piers are Separating, using the existing upper structure, arranging the individual divided bodies in the bridge axis direction, combining the arranged individual divided bodies, and integrating them as the new upper structure; It is constructed between two piers.
[0009]
In the bridge according to the present invention, a new upper structure having a structure in which the length in the bridge axis direction is variable is placed on a jack located between two adjacent piers and below the existing upper structure. Arranged in a shortened state in the axial direction and extending the jack upward, the existing upper structure built between the two piers is pushed up by the new upper structure and separated from the two piers. Then, before or after the existing upper structure is removed, the new upper structure is extended in the direction of the bridge axis and installed between the two piers.
[0010]
In the bridge according to the present invention, a new upper structure divided into a plurality of parts in the bridge axis direction is placed on a jack disposed between two adjacent piers and below an existing upper structure. Arranged in a stacked state and extending the jack upward, the existing upper structure constructed between the two piers is pushed up by the new upper structure and separated from the two piers, Using the existing superstructure, the individual divisions are arranged in the direction of the bridge axis, and the arranged individual divisions are combined and integrated as the new superstructure, between the two piers. Characterized by erection.
[0011]
The superstructure of the bridge according to the present invention is On the jack placed between two adjacent piers and below the existing superstructure, An upper structure of a bridge constructed between the two adjacent piers, which is divided into a plurality of pieces in the bridge axis direction, and the adjacent divided bodies are hinged on the upper surface so that the length in the bridge axis direction is variable. The existing divided upper structure having a simple structure is arranged in a state of being shortened in the bridge axis direction, and the jack is extended upward, whereby the existing upper structure constructed between the two bridge piers. The new divided upper structure is pushed up by the new divided upper structure and separated from the two piers, and the new divided upper structure is moved to the bridge before or after the existing upper structure is removed. Along the two piers, extending in the axial direction and integrated. It is characterized by that.
[0012]
In the present invention, the new upper structure whose length is shortened is moved upward to replace the existing upper structure, and is extended before or after the existing upper structure is removed. Build between the piers. According to the present invention, the construction of the newly constructed superstructure can be carried out in a short period of time by making the construction of the newly constructed superstructure variable in the bridge axis direction. The period during which it cannot be done can be shortened, and the social and economic losses incurred by the surrounding area can be reduced.
[0013]
In the present invention, the newly constructed upper structure is divided into a plurality of pieces in the bridge axis direction and the adjacent divided bodies are hinged to each other so that the length is variable in the bridge axis direction, and the existing upper structure is removed. After that, it is desirable to extend the newly constructed superstructure in the direction of the bridge axis and install it between the two piers. It is very easy and inexpensive to divide the new upper structure into multiple parts in the bridge axis direction and to connect the adjacent divided bodies with hinges to make the new upper structure variable in length. Therefore, the construction work can be made more efficient and the construction cost can be reduced.
[0014]
In the present invention, the new upper structure arranged in a state where the individual divided bodies are stacked is moved upward to replace the existing upper structure, and the individual divided bodies are replaced with the existing upper structure using the existing upper structure. They are arranged in the direction of the bridge axis, and the individual divided bodies arranged are combined and integrated as a new superstructure and installed between two piers. According to the present invention, the newly constructed upper structure is divided into individual divided bodies, and the individual divided bodies are arranged in the direction of the bridge axis using the existing upper structures. Can be done in a short period of time, the period during which the bridge cannot be used can be shortened, and the social and economic losses incurred by the surrounding area can be reduced.
[0015]
In the present invention, it is desirable to attach a track to an existing superstructure and to move the individual divided bodies along the track in the direction of the bridge axis. By moving the individual divided bodies along the track attached to the existing superstructure, the arrangement work of the divided bodies can be easily performed, so that the construction work can be made more efficient and the construction cost can be reduced.
[0016]
In the present invention, it is desirable to divide the pier into a plurality of parts in the height direction at the beginning, and to build each divided body so that those to be installed closer to the upper end move upward one by one. In this way, the bridge pier can be used as a jack and the pier can be reconstructed at the same time as the replacement of the superstructure. Therefore, the work efficiency and the construction cost can be reduced for the entire bridge replacement work. .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 shows an upper structure 1 that can change the length in the bridge axis direction by folding both ends. The superstructure 1 is composed of a bridge girder 2 and a floor slab 3 that are integrated into three parts in the bridge axis direction, and both sides in the bridge axis direction of the intermediate part 4 that is the main part of each divided body. The end portions 5 and 6 are connected to each other via the hinge portion 7. Each of the end portions 5 and 6 can be rotated by approximately 180 ° on the upper surface side of the intermediate portion 4 around the hinge portion 7. In this state, the end portions 5 and 6 are placed on the intermediate portion 4. It will be.
[0018]
A bridge replacement method using the superstructure configured as described above will be described with reference to FIGS.
First, as shown in FIG. 2A, a plurality of large jacks 11 are disposed between two adjacent bridge piers 10 and 10 so as to be separated in the bridge axis direction. Both large jacks 11 are shortened. The newly installed upper structure 1 shown in FIG. 1 is placed on the shortened large jack 11 in a state in which both end portions 5 and 6 are folded on the intermediate portion 4 and the length in the bridge axis direction is shortened. A sync jack 12 and a roller mount 13 are arranged on the newly-folded upper structure 1.
[0019]
Next, as shown in FIG. 2 (b), the large jack 11 is extended, and the existing upper structure 14 installed between the piers 10, 10 is replaced with the newly installed upper part via the sync jack 12 and the roller mount 13. It is supported on the structure 1. Subsequently, the large jack 11 is extended, and the existing upper structure 14 is pushed up by the new upper structure 1 and separated from the pier 10. Further, the large jack 11 is continuously extended, and the newly installed upper structure 1 is raised to the same height as the upper structures 14 'on both sides. It should be noted that fastening means (not shown) such as connecting bolts that have fixed the existing upper structure 14 to the pier 10 or the upper structure 14 'on both sides are removed in advance.
[0020]
When the new upper structure 1 is raised to the same height as the upper structures 14 'on both sides, the sync jack 12 is driven on the new upper structure 1 as shown in FIG. The upper structure 14 is moved to one side in the bridge axis direction. After the sync jack 12 is moved as much as possible on the new upper structure 1, the sync jack 12 is shortened so that the existing upper structure 14 is supported only by the roller mount 13, and the sync jack 12 is Move to the other in the direction of the bridge axis. The sync jack 12 is extended to support the existing upper structure 14, the sync jack 12 is driven again, and the existing upper structure 14 is moved to one side in the bridge axis direction. This operation is repeated several times. If necessary, the existing jack 14 to be removed is supported by disposing the sync jack 12 on the upper structure 14 'located on one side in the bridge axis direction.
[0021]
Next, as shown in FIG. 3A, the trailer 15 is disposed on the upper structure 14 ′, and one end of the existing upper structure 14 is sequentially delivered onto the trailer 15. When the existing superstructure 14 on the trailer 15 has an appropriate length, this portion is cut with a cutter, placed on the trailer 15, and removed from the bridge. The remaining part is cut and removed by repeating the same operation as above.
[0022]
When all the existing upper structures 14 are removed, as shown in FIG. 3 (b), the large jack 11 is extended to raise the new upper structure 1 one more stage, and then the upper structures 14 on both sides are removed. The truck cranes 16 are respectively arranged on the upper side, and the folded ends 5 and 6 of the newly installed superstructure 1 are lifted by the truck crane 16 and deployed. When both ends 5 and 6 are deployed, the large jack 11 is shortened to lower the newly installed upper structure 1 by one step, and then the newly installed upper structure is used using fastening means (not shown) such as a connecting bolt. The object 1 and the upper structures 14 ′ on both sides, and these structures and the pier 10 are fastened.
[0023]
When each part is fastened and sufficient strength is secured, the hinge portion (not shown) is removed from the newly constructed upper structure 1, and the large jack 11 is shortened and removed as shown in FIG. 3 (c). Complete the replacement work. Thereby, the newly installed upper structure 1 is installed between the piers 10 and 10. Thereafter, the same replacement work is continuously performed on the adjacent existing upper structure 14 '.
[0024]
According to the replacement construction method of the present embodiment, the construction work of the upper structure 1 can be performed in a short period of time by making the newly constructed upper structure 1 a structure whose length in the bridge axis direction is variable. Therefore, the period during which the bridge cannot be used can be shortened, and the social and economic losses incurred by the surrounding area can be reduced.
[0025]
Further, the length of the upper structure 1 can be varied by dividing the newly formed upper structure 1 into a plurality of pieces in the bridge axis direction and hinge-connecting the adjacent divided bodies (intermediate bodies 4, ends 5, 6). Since a simple structure can be realized very simply and inexpensively, it is possible to improve the efficiency of construction work and reduce the construction cost.
[0026]
In the present embodiment, the new upper structure 1 is deployed after the existing upper structure 14 is removed, but the new upper structure 1 is deployed before the existing upper structure 14 is removed. You may do it.
[0027]
Next, a second embodiment according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the component already demonstrated in the said embodiment, and description is abbreviate | omitted.
In the present embodiment, the newly constructed upper structure 1 is not hinged, but is simply divided into a plurality of pieces in the bridge axis direction. A bridge replacement method performed using such an upper structure will be described with reference to FIGS.
First, as shown in FIG. 4A, a plurality of large jacks 11 are arranged between two adjacent piers 10 and 10 so as to be separated in the bridge axis direction. Both large jacks 11 are shortened. On the shortened large jack 11, the new upper structure 1 is arranged in a state where both end portions 5 and 6 are stacked on the intermediate portion 4. A sync jack 12, a roller mount 13, and a small jack 19 are arranged on the newly constructed upper structure 1, and a plurality of guide rails (tracks) 20 are arranged on the sync jack 12 and the roller mount 13 in the direction of the bridge axis. Place them side by side temporarily.
[0028]
Next, as shown in FIG. 4B, the large jack 11 is extended, and the guide rail 20 is placed along the lower surface of the existing upper structure 14 installed between the piers 10 and 10. When the guide rail 20 is placed along the lower surface of the existing upper structure 14, the sync jack 12 is driven to move the two guide rails 20 in opposite directions in the bridge axis direction. When the sync jack 12 is moved as much as possible on the new upper structure 1 and the ends of the two guide rails 20 are moved to reach both ends of the existing upper structure 14, FIG. As shown, the guide rail 20 is fixed to the lower surface of the existing upper structure 14.
[0029]
When the guide rail 20 is fixed to the lower surface of the existing upper structure 14, the large jack 11 is extended again, and the existing upper structure 14 is pushed up by the new upper structure 1 and separated from the pier 10. Further, the extension of the large jack 11 is continued, and the new upper structure 1 is raised to the same height as the upper structures 14 ′ on both sides as shown in FIG. It should be noted that fastening means (not shown) such as connecting bolts that have fixed the existing upper structure 14 to the pier 10 or the upper structure 14 'on both sides are removed in advance.
[0030]
When the new upper structure 1 is raised to the same height as the upper structures 14 'on both sides, as shown in FIG. 5 (b), both ends 5 and 6 of the new upper structure 1 are connected to the guide rails. It is suspended at 20 and moved to the pier 10 side. In addition, it is desirable that the movements of both end portions 5 and 6 proceed simultaneously in both directions so as not to break the balance of the existing upper structure 14 supported by the sync jack 12.
[0031]
When the both end portions 5 and 6 of the new upper structure 1 are respectively moved onto the gap between the intermediate portion 4 and the upper structure 14 'on both sides, the both end portions are suspended as shown in FIG. 5 (c). Then, it is inserted into the gap 21 and fastened to the intermediate structure and the upper structure 14 ′ on both sides and further to the pier 10 using fastening means (not shown) such as a connecting bolt.
[0032]
When each part is fastened and sufficient strength is secured, as shown in FIG. 6 (a), trailers 15 are arranged on the new upper structure 1 from the upper structure 14 'on both sides, and each trailer is arranged. 15 is arranged so that the end portion of the existing superstructure 14 is put on it. The sync jack 12 and the small jack 19 are shortened, and the existing upper structure 14 is supported by each trailer 15. A portion of the existing superstructure 14 that has reached the trailer 15 is cut with a cutter and placed on the trailer 15, and the trailer 15 is pulled to be removed from the bridge. As for the remaining portion, as shown in FIG. 6B, the sync jack 12 and the small jack 19 are replaced and supported, and then placed on another trailer 15 and removed.
[0033]
When all the existing upper structures 14 are removed, the large jack 11 is shortened and removed as shown in FIG. 6C to complete the replacement work. Thereby, the newly installed upper structure 1 is installed between the piers 10 and 10. Thereafter, the same replacement work is continuously performed on the adjacent existing upper structure 14 '.
[0034]
According to the replacement method of the present embodiment, the newly constructed upper structure 1 is divided into a plurality of parts, and both end portions 5 and 6 are arranged in the bridge axis direction using the existing upper structure 14, thereby Since the construction work of the superstructure 1 can be performed in a short period of time, the period during which the bridge cannot be used can be shortened, and the social and economic losses incurred by the surrounding area can be reduced.
[0035]
Further, by moving the both end portions 5 and 6 along the guide rail 20 attached to the existing upper structure 14, the arrangement work of the both end portions 5 and 6 is facilitated. Can be reduced.
[0036]
Next, a third embodiment according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the component already demonstrated in the said embodiment, and description is abbreviate | omitted.
In the present embodiment, two structures are used: an upper structure 1A that can fold both end portions 5 and 6, and an upper structure 1B that can fold only one end portion 6. A jack-up pier 30 is used. As shown in FIG. 7, the jack-up pier 30 is divided into a plurality of pieces having substantially the same length in the height direction. It is built by stacking from the lower end side so as to move. On the foundation 32 that supports the pier 30 is installed a support 33 for lifting the stacked divided bodies 31 by one divided body 31, and each divided body 31 is moved upward along the support 33. A slide jack 34 to be pushed up is provided.
A bridge replacement method performed using such superstructures 1A and 1B and the jack-up pier 30 will be described with reference to FIGS.
[0037]
First, as shown in FIG. 8A, a foundation 32 is constructed adjacent to each of the adjacent piers 10A, 10B among the three piers 10A, 10B, 10C arranged in the bridge axis direction. The jack-up pier 30 is constructed, and the large jack 11 is disposed adjacent to each of the adjacent piers 10B and 10C. The jack-up pier 30 is as high as one shortest divided body 31, and the large jacks 11 are all shortened. On the jack-up pier 30 and the large jack 11, the newly installed upper structures 1A and 1B are arranged in a state where the end portions 5 and 6 are folded and the length in the bridge axis direction is shortened. A sync jack 12 and a roller mount 13 are arranged on the newly folded upper structures 1A and 1B.
[0038]
Next, as shown in FIG. 8 (b), the jackup-type pier 30 and the large jack 11 are extended, and the existing upper structure 14 installed between the piers 10A to 10C is replaced with the sync jack 12 and the roller mount. 13 is supported on the newly installed superstructures 1A and 1B. Subsequently, the jack-up pier 30 and the large jack 11 are extended, and the existing upper structure 14 is pushed up by the new upper structures 1A and 1B to be separated from the pier 10. Further, the jack-up pier 30 and the large jack 11 are continuously extended, and the newly installed upper structures 1A and 1B are raised to the same height as the upper structures 14 'on both sides. It should be noted that fastening means (not shown) such as connecting bolts that fix the existing upper structure 14 to the piers 10A, 10B, 10C and the upper structures 14 'on both sides are removed in advance.
[0039]
When the new upper structure 1 is raised to the same height as the upper structures 14 'on both sides, the sync jack 12 is driven on the new upper structures 1A and 1B as shown in FIG. 8 (c). Then, the existing upper structure 14 is moved to one side in the bridge axis direction. When the sync jack 12 is moved as much as possible on the newly installed upper structures 1A and 1B, the sync jack 12 is shortened and the existing upper structure 14 is supported only by the roller mount 13, and then the sync jack 12 is moved to the other side of the bridge axis direction. The sync jack 12 is extended to support the existing upper structure 14, the sync jack 12 is driven again, and the existing upper structure 14 is moved to one side in the bridge axis direction.
[0040]
Next, as shown in FIG. 9A, the trailer 15 is disposed on the upper structure 14 ′, and one end of the existing upper structure 14 is sequentially sent onto the trailer 15. When the existing superstructure 14 hung on the trailer 15 has an appropriate length, this portion is cut with a cutter, placed on the trailer 15, and removed from the bridge. The remaining part is cut and removed by repeating the same operation as above.
[0041]
After all the existing upper structure 14 is removed, as shown in FIG. 9B, the jackup-type bridge pier 30 and the large jack 11 are extended to raise the new upper structure 1 one step further. The truck crane 16 is arranged on the upper structures 14 ′ on both sides, and the folded end portions 5 and 6 of the newly installed upper structures 1 A and 1 B are lifted by the truck crane 16 and deployed. When the end portions 5 and 6 are deployed, the jack-up pier 30 and the large jack 11 are shortened to lower the newly installed upper structures 1A and 1B by one step.
[0042]
When each part of the newly installed upper structure 1A, 1B is fastened with a connecting bolt and sufficient strength is secured, the hinge portion (not shown) is removed from the newly installed upper structure 1A, 1B, and FIG. ), The large jack 11 and the existing piers 10A and 10B are removed to complete the replacement work. Thereby, the newly installed upper structures 1A and 1B are installed between the three piers 30, 30, and 10C arranged in the bridge axis direction. Thereafter, the same replacement work is performed on the adjacent existing upper structure 14 '.
[0043]
According to the replacement method of the present embodiment, it is possible to rebuild the bridge pier at the same time as the replacement of the superstructure using the pier as a jack. Construction costs can be reduced.
[0044]
In this embodiment, the upper structure is provided with a variable length structure by hinge connection as in the first embodiment. Instead, the upper structure is provided in the upper structure as in the second embodiment. A variable length structure may be provided by a simple guide rail.
In the present embodiment, the pier is reconstructed in conjunction with the replacement of the upper structure. However, the upper structure may be used as it is and only the pier is reconstructed.
[0045]
【The invention's effect】
As described above, according to the present invention, the construction of the new upper structure can be performed in a short period of time by adopting a structure in which the length of the new upper structure is variable in the bridge axis direction. Therefore, the period during which the bridge cannot be used can be shortened, and the social and economic losses incurred by the surrounding area can be reduced.
[0046]
According to the present invention, the new upper structure is divided into a plurality of parts in the bridge axis direction, and adjacent divided bodies are hinged to each other, so that the new upper structure has a variable length structure. Therefore, the construction work can be made more efficient and the construction cost can be reduced.
[0047]
According to the present invention, the newly constructed upper structure is divided into individual divided bodies, and the individual divided bodies are arranged in the direction of the bridge axis using the existing upper structures. Can be done in a short period of time, the period during which the bridge cannot be used can be shortened, and the social and economic losses incurred by the surrounding area can be reduced.
[0048]
According to the present invention, by moving the individual divided bodies along the track attached to the existing superstructure, it becomes easier to arrange the divided bodies, so that the construction work can be made more efficient and the construction cost can be reduced. Is possible.
[0049]
According to the present invention, the bridge pier can be used as a jack, and the pier can be reconstructed at the same time as the replacement of the superstructure. Is possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment according to the present invention, and is a side view showing an upper structure provided with a structure having a variable length in a bridge axis direction.
FIG. 2 is a stepwise state diagram for explaining a bridge replacement method in the first embodiment.
FIG. 3 is a stepwise state diagram for explaining the bridge replacement method according to the first embodiment.
FIG. 4 is a diagram showing a second embodiment according to the present invention, and is a stepwise state diagram for explaining a bridge replacement method.
FIG. 5 is also a stepwise state diagram for explaining a bridge replacement method in the second embodiment.
FIG. 6 is also a stepwise state diagram for explaining the bridge replacement method in the second embodiment.
FIG. 7 is a side view showing a structure of a jack-up type pier according to a third embodiment of the present invention.
FIG. 8 is a staged state diagram for explaining a bridge replacement method in the third embodiment.
FIG. 9 is a stepwise state diagram for explaining a bridge replacement method according to the third embodiment.
[Explanation of symbols]
1 New superstructure
2 Bridge girder
3 Floor slab
4 middle part
5,6 end
7 Hinge part
10 Pier
11 Large jack
12 Sync jack
13 Roller mount
14 Existing superstructure
15 trailer
19 Small jack
20 Guide rail (track)
21 gap
30 Jack-up pier
31 Individual divisions
32 Basics
33 Supporting work
34 Slide jack

Claims

A new divided upper structure with a variable length in the bridge axis direction is shortened in the bridge axis direction on a jack located between two adjacent piers and below the existing upper structure. Placed in the
By extending the jack upward, the existing upper structure constructed between the two piers is pushed up by the newly divided upper structure and separated from the two piers,
Before or after removing the existing superstructure, the newly divided superstructure is extended in the direction of the bridge axis and integrated between the two bridge piers. Replacement method.

The newly constructed upper structure is divided into a plurality of pieces in the direction of the bridge axis and the adjacent divided bodies are hinge-connected to form a variable length structure.
2. The method of replacing a bridge according to claim 1, wherein after the existing upper structure is removed, the newly installed upper structure is extended in the direction of the bridge axis and installed between the two piers.

On the jack placed between two adjacent piers and below the existing superstructure, the new superstructure divided into multiple pieces in the direction of the bridge axis is arranged in a state in which individual divisions are stacked,
By extending the jack upward, the existing superstructure constructed between the two piers is pushed up by the new superstructure and separated from the two piers,
Using the existing superstructure, the individual divided bodies are arranged in the bridge axis direction,
A bridge replacement method characterized in that the individual divided bodies arranged are combined and integrated as the new superstructure and installed between the two bridge piers.

The bridge replacement method according to claim 3, wherein a track is attached to the existing superstructure, and the individual divided bodies are moved along the track in the bridge axis direction.

The pier is divided into a plurality of parts in the height direction at the beginning, and each divided body is constructed by stacking so that ones to be installed near the upper end move upward one by one. Or the bridge replacement method described in 4.

A new divided upper structure with a variable length in the bridge axis direction is shortened in the bridge axis direction on a jack located between two adjacent piers and below the existing upper structure. Placed in the
By extending the jack upward, the existing upper structure constructed between the two piers is pushed up by the newly divided upper structure and separated from the two piers,
Before or after removing the existing superstructure, the newly divided superstructure is extended and integrated in the direction of the bridge axis, and bridged between the two piers. .

On the jack placed between two adjacent piers and below the existing superstructure, the new superstructure divided into multiple pieces in the direction of the bridge axis is arranged in a state in which individual divisions are stacked,
By extending the jack upward, the existing superstructure constructed between the two piers is pushed up by the new superstructure and separated from the two piers,
Using the existing superstructure, the individual divided bodies are arranged in the bridge axis direction,
A bridge characterized in that the individual divided bodies arranged are combined and integrated as the newly installed superstructure and installed between the two piers.

An upper structure of a bridge constructed between two adjacent piers on a jack disposed between two adjacent piers and below the existing upper structure, and is divided into a plurality of parts in the direction of the bridge axis. The newly divided upper structure having a structure in which adjacent divided bodies are hinged on the upper surface and the length in the bridge axis direction is variable is arranged in a state shortened in the bridge axis direction,
By extending the jack upward, the existing upper structure constructed between the two piers is pushed up by the newly divided upper structure and separated from the two piers,
Before or after removing the existing superstructure, the newly divided superstructure is extended and integrated in the direction of the bridge axis, and bridged between the two piers. Superstructure.