JP3978644B2

JP3978644B2 - Construction method of wide road

Info

Publication number: JP3978644B2
Application number: JP2001055658A
Authority: JP
Inventors: 孝義森川; 啓介塩田; 聡松永; 裕史宮川
Original assignee: JFE Civil Engineering and Construction Corp
Current assignee: JFE Civil Engineering and Construction Corp
Priority date: 2001-02-28
Filing date: 2001-02-28
Publication date: 2007-09-19
Anticipated expiration: 2021-02-28
Also published as: JP2002256504A

Description

【０００１】
【発明の属する技術分野】
本発明は、傾斜地にある既存道路の幅を拡幅する際の拡幅道路の施工方法に関し、特に拡幅道路の施工に際して交通遮断を行う必要を回避することができる拡幅道路の施工方法に関する。
【０００２】
【従来の技術】
山間部斜面や海岸、川縁などの傾斜地には傾斜面を横切るように延びる道路を設けていることが多い。そして、この傾斜地に既設された既存道路において、例えば、交通量の増加や大型車の通行開放などに伴って、道路の拡幅が必要になるときがある。この場合、傾斜地に既設された既存道路では、平地の道路に比較してその拡幅が難しく、とりわけ勾配の強い斜面での拡幅工事は困難である。
【０００３】
この傾斜地における既存道路の拡幅方法として、例えば、既存道路の山側斜面を切り崩した部分に道路を拡幅する手法がある。しかし、この手法では、多量の土砂が発生するばかりでなく、傾斜が急な場合には、山側斜面を切り崩せないことがある。
これら問題を解消する技術として、例えば、特開平１０−２２７００２号公報及び特開２０００−２８２４０３号公報に開示された拡幅道路の施工方法が知られている。
【０００４】
このうち、特開平１０−２２７００２号公報に開示された拡幅道路の施工方法は、図１６に示すように、既存道路１０１の山側端及び谷側端のそれぞれに複数の基礎杭１０３、１０４を道路の延長方向に所定間隔で打設し、これら基礎杭１０３、１０４の頭部を、既存道路１０１から谷側に向けて水平に延びた張出し桁１０６を有する基礎桁１０５で結合し、そして、張出し桁１０６上に床版１０７を載置し、この床版１０７上に舗装１０８を施して既存道路１０１の谷側に拡幅道路１０２を施工するものである。
【０００５】
また、特開２０００−２８２４０３号公報に開示された拡幅道路の施工方法は、図１７に示すように、既存道路（図示せず）の谷側に複数の基礎杭２０１を打設し、この基礎杭２０１の上に杭頭ブロック２０２を接合するとともに、杭頭ブロック２０２上に格点部２０３ａ間を横桁２０３ｂで連結した格点桁２０３を載置・接合し、さらに、縦方向の格点桁２０３の格点部２０３ａ間を複数の主桁２０４で接合・連結し、これら格点桁２０３及び主桁２０４の上に床版（図示せず）を載置して拡幅部を構築し、そして、既存道路と拡幅部との境界接合を行うとともに床版の上に舗装を行って拡幅道路（図示せず）を施工するものである。
【０００６】
【発明が解決しようとする課題】
しかしながら、これら従来の拡幅道路の施工方法にあっては、以下の問題点があった。
即ち、特開平１０−２２７００２号公報に開示された拡幅道路の施工方法にあっては、既存道路１０１そのものに基礎杭１０３，１０４を打設し、基礎杭１０３，１０４の頭部を、張出し桁１０６を有する基礎桁１０５で結合し、張出し桁１０６上に床版１０７を載置して拡幅道路１０２を施工するものであるため、杭打ち機や基礎桁１０５、床版１０７を施工するための重機や基礎桁１０５等をすべて既存道路１０１上に配置して行う必要があった。このため、既存道路１０１上が重機等で塞がれ、交通遮断を回避することができなかった。
【０００７】
また、特開２０００−２８２４０３号公報に開示された拡幅道路の施工方法にあっても、基礎杭２０１を打設するための杭打ち機や桁２０３、２０４及び床版等を施工するため重機等を既存道路上に配置する必要があり、交通遮断を回避することができなかった。
特に、山間部などでは既存道路を通行止めすることで、交通に当たって長大な迂回をする必要が生じ、近隣の居住者に多大な不便を強いていた。また、実質的に迂回路を設定できない場合には、時間を定めて交通の遮断と往来を繰り返すといった作業工程管理が必要となり、居住者に不便を強いるのみならず、道路施工工事自体も重機の配置替えや作業の中断といったことで極めて効率の悪い作業となってしまっていた。
【０００８】
従って、本発明は上述の問題点に鑑みてなされたものであり、その目的は、拡幅道路の施工に際して交通遮断を行う必要を回避することができる拡幅道路の施工方法を提供することにある。
【０００９】
【課題を解決するための手段】
上記問題を解決するため、本発明のうち請求項１に係る拡幅道路の施工方法は、傾斜地に既設されている既存道路の谷側に、境界接合部を介して拡幅道路を前記既存道路に沿って構築する拡幅道路の施工方法において、前記既存道路の谷側に、該既存道路の交通を確保しつつ、手述べ工法により杭、桁、覆工受桁、及び覆工板からなる桟道本体を施工する工程と、該桟道本体の施工が完了した後、道路交通を前記既存道路から前記桟道本体に切り替え、前記境界接合部を構築する工程と、該境界接合部が構築された後、道路交通を前記桟道本体から前記既存道路に切り替え、前記覆工板及び覆工受桁を取り外して、前記桁上に床版を施工すると共に該床版上に舗装を行って拡幅道路を構築する工程とを具備したことを特徴としている。
【００１０】
この拡幅道路の施工方法によれば、既存道路の交通を確保しつつ既存道路の谷側に手述べ工法により杭、桁、覆工受桁、及び覆工板からなる桟道本体の施工を行い、桟道本体の施工が完了した後、道路交通を既存道路から桟道本体に切り替えて、境界接合部を構築する。その後、道路交通を桟道本体から既存道路に切り替えて、覆工板及び覆工受桁を取り外して、桁上に床版を施工すると共に床版上に舗装を行い、拡幅道路を構築するようにしている。従って、拡幅道路の施工に際して交通遮断を行う必要を回避することができる。
【００１１】
また、本発明のうち請求項２に係る拡幅道路の施工方法は、請求項１記載の発明において、前記境界接合部を構築する工程が、前記既存道路の谷側斜面を掘削すると共に掘削された掘削部に延出する張出し桁を前記桁に架設する工程と、前記張出し桁間に端床桁を架設する工程と、前記掘削部に土留め擁壁を構築する工程と、前記土留め擁壁、前記端床桁及び前記張出し桁上に床版を施工すると共に該床版上に舗装を行う工程とを含むことを特徴としている。
【００１２】
この拡幅道路の施工方法によれば、桟道本体を施工した後、既存道路の谷側斜面を掘削すると共に掘削された掘削部に延出する張出し桁を前記桁に架設し、張出し桁間に端床桁を架設し、掘削部に土留め擁壁を構築し、土留め擁壁、端床桁及び張出し桁上に床版を施工すると共に床版上に舗装を行うことで、境界接合部を構築することができる。この際に、交通遮断を行う必要はない。
【００１３】
なお、請求項１において、「手述べ工法」とは、発進基地上の杭打ち機等の重機により、既存道路の谷側に、杭、桁、覆工受桁及び覆工板の順番に１スパン分の桟道本体の施工を行った後、前記重機を前記１スパン分の桟道本体の覆工板上に進行させて次のスパン分の桟道本体の施工を行い、この施工が完了した後、前記重機を前記次のスパン分の桟道本体の覆工板上に進行させて更に次のスパン分の桟道本体の施工を進めてこの作業を繰り返し、既存道路の谷側に複数スパンの桟道本体を施工する工法をいう。
【００１４】
【発明の実施の形態】
次に本発明の実施形態を図面を参照して説明する。図１は既存道路、境界接合部、及び拡幅道路を示す部分断面斜視図である。図２は杭、桁及び床版を構成する部材を説明するための斜視図である。
図１に示すように、傾斜地に既設されている既存道路１Ａの谷側に、境界接合部１Ｂを介して拡幅道路１Ｃが前記既存道路１Ａに沿って構築される。
【００１５】
そして、拡幅道路１Ｃは、既存道路１Ａの谷側斜面２に既存道路１Ａに沿って打設された複数の杭３と、これら杭３上に杭３を架渡すように設置された桁６と、桁６上に施工された床版７と、床版７上に施工された舗装８とで構築される。
ここで、各杭３は、図２に示すように、地盤に打設される鋼管杭等の基礎杭３ａと、基礎杭３ａ上に接合される杭頭ブロック３ｂとで構成されている。また、桁６は、杭頭ブロック３ｂ上に載置・接合される格点部４ａ間を横桁４ｂで連結した格点桁４と、既存道路１Ａに沿う方向の格点部４ａ間を連結する主桁５とで構成されている。さらに、床版７は、例えばＩ形鋼格子床版７ａにコンクリートを打設して構成される。
【００１６】
次に、拡幅道路１Ｃの施工方法について図３乃至図１５を参照して説明する。図３は桟道本体を施工している状態を示す正面から見た概略断面図、図４は手述べ工法を説明するもので、（Ａ）は杭打ち機等の重機が発進基地にあるときの作業状態を示す概略側面図、（Ｂ）は重機が桟道本体の所定スパン上にあるときの作業状態を示す概略側面図、（Ｃ）は重機が桟道本体の最終スパンの作業を行っている状態を示す概略側面図である。図５は手述べ工法において、杭打ち機等の重機が桟道本体の所定スパン上にあるときの作業状態を具体的に説明するための概略側面図である。図６は桟道本体の施工が終了し、道路交通を桟道本体に切り替えた状態を示す正面から見た概略断面図である。図７は既存道路上の掘削機で境界接合部における谷側斜面を掘削している状態を示す正面から見た概略断面図である。図８は既存道路上の重機により張出し桁を架設している状態を示す正面から見た断面図である。図９は張出し桁の横桁に対する架設状態を示し、（Ａ）は平面図、（Ｂ）は正面図、（Ｃ）は張出し桁の上壁部及び横桁の上壁部の底面図である。図１０は既存道路上の重機により端床桁を架設している状態を示す正面から見た概略断面図である。図１１は端床桁の張出し桁に対する架設状態を示す図１０の矢印Ａ方向から見た矢視図である。図１２は既存道路上のコンクリートミキサーでコンクリートを打設して掘削部に土留め擁壁を構築している状態を示す正面から見た概略断面図である。図１３は境界接合部における土留め擁壁、端床桁及び張出し桁上に床版を施工すると共に床版上に舗装を行った状態を示す正面から見た概略断面図である。図１４は覆工受桁及び覆工板を取り外して格点桁及び主桁上に床版を施工する共に床版上に舗装を行った状態を示す正面から見た概略断面図である。図１５は境界接合部における舗装上に設置された高欄を取り外して拡幅道路が完成した状態を示す正面から見た概略断面図である。
【００１７】
拡幅道路１Ｃを施工するには、先ず、図３に示すように、傾斜地に既設された既存道路１Ａの谷側に、既存道路１Ａの交通を確保しつつ、手述べ工法により杭桟道本体２０を施工する。図３においては、車両５０が既存道路１Ａ上を通行可能となっている。桟道本体２０は、既存道路１Ａに沿って地盤に打設される鋼管杭等の複数の基礎杭３ａと、基礎杭３ａ上に接合される杭頭ブロック３ｂと、杭頭ブロック３ｂ上に載置・接合される格点部４ａ間を横桁４ｂで連結した格点桁４と、既存道路１Ａに沿う方向の格点部４ａ間を連結する主桁５と、主桁５上に設置された覆工受桁１２と、覆工受桁１２上に設置された覆工板１３とで構成された複数スパンの構成となっている。
【００１８】
この手述べ工法は、図４（Ａ）に示すように、発進基地Ａ上の杭打ち機等の重機Ｃにより既存道路１Ａの谷側に、図５に示す基礎杭３ａ、杭頭ブロック３ｂ、格点桁４、主桁５、覆工受桁１２及び覆工板１３の順番に１スパン分の桟道本体２０の施工を行った後、重機Ｃを１スパン分の桟道本体２０の覆工板１３上に進行させて次のスパン分の桟道本体２０の施工を行い、この施工が完了した後、重機Ｃを次のスパン分の桟道本体２０の覆工板１３上に進行させて更に次のスパン分の桟道本体２０の施工を進めて、図４（Ｂ）、（Ｃ）に示すように、この作業を繰り返し、全スパン分の桟道本体２０を施工するものである。最終スパン分の桟道本体２０の施工が完了したら、杭打ち機等の重機Ｃは終着基地Ｂ上に移動する。手述べ工法において、基礎杭３ａが重機Ｃにより打設されてから杭頭ブロック３ｂが基礎杭３ａの頭部に接合され、重機Ｃにより格点桁４の格点部４ａが杭頭ブロック３ｂ上に載置されると共に溶接により杭頭ブロック３ｂ上に接合され、重機Ｃにより主桁５が格点部４ａ間に配置されるとともに主桁５と格点部４ａとが高力ボルトによる添接板継手等により接合され、重機Ｃにより格点部４ａ上に覆工受桁１２を載置するとともに覆工受桁１２上に覆工板１３が載置される。
【００１９】
桟道本体２０の施工が完了した後、図６に示すように、道路交通を既存道路１Ａから桟道本体２０に切り替え、車両５０が桟道本体２０の覆工板１３上を通行可能にする。
そして、道路交通を既存道路１Ａから桟道本体２０に切り替えた後、境界接合部１Ｂの施工を行う。具体的には、図７に示すように、掘削機Ｄを既存道路１Ａ上に進行させ、掘削機Ｄにより境界接合部１Ｂにあたる既存道路１Ａの谷側斜面２を掘削する。この掘削により、既存道路１Ａの路肩には掘削部１４が形成される。
【００２０】
掘削部１４を形成した後、図８に示すように、既存道路１Ａ上の重機Ｃにより複数の張出し桁１５を格点桁４の横桁４ｂの掘削部１４側の端部に位置させ、添接板１６及び高力ボルト１７により各張出し桁１５を横桁４ｂの前記端部に架設する。各張出し桁１５は、図９に示すように、横桁４ｂの延びる方向に沿って互いに平行に延びる上壁部１５ａ及び下壁部１５ｂと、上壁部１５ａと下壁部１５ｂとを連結する連結壁部１５ｃとから構成され、図９に最もよく示すように、横桁４ｂの上壁部と張出し桁１５の上壁部１５ａ、横桁４ｂの下壁部と張出し桁１５の下壁部１５ｂ、及び横桁４ｂの連結壁部と張出し桁１５の連結壁部１５ｃとを添接板１６及び高力ボルト１７により接合する。張出し桁１５を横桁４ｂに接合するには、溶接等の他の方法であってもよい。
【００２１】
張出し桁１５を架設した後、図１０に示すように、既存道路１Ａ上の重機Ｃにより端床桁１８を各張出し桁１５の先端間に架設する。各端床桁１８は、図１１に示すように、張出し桁１５に対して直交する方向に沿って互いに平行に延びる上壁部１８ａ及び下壁部１８ｂと、上壁部１８ａと下壁部１８ｂとを連結する連結壁部１８ｃとから構成され、各張出し桁１５の先端に形成された板部１５ｄと連結壁部１８ｃとを添接板１９及び高力ボルト２２により接合する。端床桁１８を張出し桁１５に接合するには、溶接等の他の方法であってもよい。張出し桁１５及び端床桁１８は、後述する土留め擁壁９を構築するためにコンクリートを打設する際の型枠として機能する。
【００２２】
端床桁１８を架設した後、図１２に示すように、既存道路１Ａ上のコンクリートミキサーＥで掘削部１４にコンクリートを打設して土留め擁壁９を構築する。土留め擁壁９を構築した後、図１３に示すように、土留め擁壁９、端床桁１８、及び張出し桁１５上に床版１０を施工すると共に床版１０上に舗装１１を行う。これにより、境界接合部１Ｂは構築される。この際に、車両５０は依然として桟道本体２０の覆工板１３上を通行可能となっている。
【００２３】
境界接合部１Ｂが完成した後、図１４に示すように、舗装１１上に高欄１９を既存道路１Ａに沿って設置し、その後、道路交通を既存道路１Ａに切り替える。これにより、車両５０は既存道路１Ａ上を通行可能となる。その後、覆工板１３及び覆工受桁１２を全スパンにわたって取り外し、格点桁４及び主桁５上に床版７を施工すると共に床版７上に舗装８を行う。そして、図１５に示すように、高欄１９を外して拡幅道路１Ｃは完成し、車両５０は既存道路１Ａ及び拡幅道路１Ｃ上を通行可能となる。
【００２４】
以上の拡幅道路１Ｃの施工方法にあっては、既存道路１Ａの交通を確保しつつ既存道路１Ａの谷側に手述べ工法により杭３、桁６、覆工受桁１２、及び覆工板１３からなる桟道本体２０の施工を行い、桟道本体２０の施工が完了した後、道路交通を既存道路１Ａから桟道本体２０に切り替えて、境界接合部１Ｂを構築し、その後、道路交通を桟道本体２０から既存道路１Ａに切り替えて、覆工板１３及び覆工受桁１２を取り外して、桁６上に床版７を施工すると共に床版７上に舗装８を行うようにしているので、拡幅道路１Ｃの施工に際して交通遮断を行う必要を回避することができる。
【００２５】
【実施例】
長さ１００ｍの拡幅道路の施工工事において、従来の既存道路を交通遮断した場合の施工方法による工期及び交通遮断期間と、本発明の施工方法による工期及び交通遮断期間とを比較した。
この結果を表１に示す。
【００２６】
【表１】

【００２７】
表１を参照すると、従来の施工方法の場合は、杭及び桁工事、床版工事、及び境界接合部の工事を総合した工期が７ヶ月であるが、交通遮断期間が７ヶ月となり、周辺住民のライフラインに大きな支障が生じた。
これに対して、本発明の施工方法の場合は、杭及び桁工事、床版工事、及び境界接合部の工事を総合した工期が８ヶ月で従来の施工方法よりも１ヶ月長くなるが、交通遮断をする必要が全くなく、周辺住民のライフラインに支障は生ぜず、交通を確保しながら拡幅道路の施工を行うことができる。
【００２８】
【発明の効果】
以上説明したように、本発明のうち請求項１に係る拡幅道路の施工方法によれば、既存道路の交通を確保しつつ既存道路の谷側に手述べ工法により杭、桁、覆工受桁、及び覆工板からなる桟道本体の施工を行い、桟道本体の施工が完了した後、道路交通を既存道路から桟道本体に切り替えて、境界接合部を構築する。その後、道路交通を桟道本体から既存道路に切り替えて、覆工板及び覆工受桁を取り外して、桁上に床版を施工すると共に床版上に舗装を行い、拡幅道路を構築するようにしているので、拡幅道路の施工に際して交通遮断を行う必要を回避することができる。
【００２９】
また、本発明のうち請求項２に係る拡幅道路の施工方法によれば、請求項１記載の発明において、前記境界接合部を構築する工程が、前記既存道路の谷側斜面を掘削すると共に掘削された掘削部に延出する張出し桁を前記桁に架設する工程と、前記張出し桁間に端床桁を架設する工程と、前記掘削部に土留め擁壁を構築する工程と、前記土留め擁壁、前記端床桁及び前記張出し桁上に床版を施工すると共に該床版上に舗装を行う工程とを含むので、桟道本体を施工した後、既存道路の谷側斜面を掘削すると共に掘削された掘削部に延出する張出し桁を前記桁に架設し、張出し桁間に端床桁を架設し、掘削部に土留め擁壁を構築し、土留め擁壁、端床桁及び張出し桁上に床版を施工すると共に床版上に舗装を行うことで、境界接合部を構築することができる。この際に、交通遮断を行う必要はない。
【図面の簡単な説明】
【図１】既存道路、境界接合部、及び拡幅道路を示す部分断面斜視図である。
【図２】杭、桁及び床版を構成する部材を説明するための斜視図である。
【図３】桟道本体を施工している状態を示す正面から見た概略断面図である。
【図４】手述べ工法を説明するもので、（Ａ）は杭打ち機等の重機が発進基地にあるときの作業状態を示す概略側面図、（Ｂ）は重機が桟道本体の所定スパン上にあるときの作業状態を示す概略側面図、（Ｃ）は重機が桟道本体の最終スパンの作業を行っている状態を示す概略側面図である。
【図５】手述べ工法において、杭打ち機等の重機が桟道本体の所定スパン上にあるときの作業状態を具体的に説明するための概略側面図である。
【図６】桟道本体の施工が終了し、道路交通を桟道本体に切り替えた状態を示す正面から見た概略断面図である。
【図７】既存道路上の掘削機で境界接合部における谷側斜面を掘削している状態を示す正面から見た概略断面図である。
【図８】既存道路上の重機により張出し桁を架設している状態を示す正面から見た断面図である。
【図９】張出し桁の横桁に対する架設状態を示し、（Ａ）は平面図、（Ｂ）は正面図、（Ｃ）は張出し桁の上壁部及び横桁の上壁部の底面図である。
【図１０】既存道路上の重機により端床桁を架設している状態を示す正面から見た概略断面図である。
【図１１】端床桁の張出し桁に対する架設状態を示す図１０の矢印Ａ方向から見た矢視図である。
【図１２】既存道路上のコンクリートミキサーでコンクリートを打設して掘削部に土留め擁壁を構築している状態を示す正面から見た概略断面図である。
【図１３】境界接合部における土留め擁壁、端床桁及び張出し桁上に床版を施工すると共に床版上に舗装を行った状態を示す正面から見た概略断面図である。
【図１４】覆工受桁及び覆工板を取り外して格点桁及び主桁上に床版を施工する共に床版上に舗装を行った状態を示す正面から見た概略断面図である。
【図１５】境界接合部における舗装上に設置された高欄を取り外して拡幅道路が完成した状態を示す正面から見た概略断面図である。
【図１６】従来例の拡幅道路の施工方法を示す概略断面図である。
【図１７】従来の他の例の拡幅道路の施工方法を示す概略断面図である。
【符号の説明】
１Ａ既存道路
１Ｂ境界接合部
１Ｃ拡幅道路
２谷側斜面
３杭
３ａ基礎杭
３ｂ杭頭ブロック
４格点桁
４ａ格点部
４ｂ横桁
５主桁
６桁
７床版
７ａＩ形鋼格子床版
８舗装
９土留め擁壁
１０床版
１１舗装
１２覆工受桁
１３覆工板
１４掘削部
１５張出し桁
１５ａ上壁部
１５ｂ下壁部
１５ｃ連結壁部
１５ｄ板部
１６添接板
１７高力ボルト
１８端床桁
１８ａ上壁部
１８ｂ下壁部
１８ｃ連結壁部
１９高欄
２０桟道本体
２１添接板
２２高力ボルト
５０車両
１０１既存道路
１０２拡幅道路
１０３，１０４基礎杭
１０５基礎桁
１０６張出し桁
１０７床版
１０８舗装
２０１基礎杭
２０２杭頭ブロック
２０３格点桁
２０３ａ格点部
２０３ｂ横桁
２０４主桁
Ａ発進基地
Ｂ終着基地
Ｃ重機
Ｄ掘削機
Ｅコンクリートミキサー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a widening road construction method when widening the width of an existing road on a sloping ground, and more particularly, to a widening road construction method that can avoid the need to block traffic during widening road construction.
[0002]
[Prior art]
In many slopes such as mountain slopes, coasts, and river edges, roads that extend across the slope are often provided. In the existing roads existing on the slope, the roads may need to be widened due to, for example, an increase in traffic volume or the opening of large vehicles. In this case, it is difficult to widen an existing road existing on an inclined land as compared with a road on a flat land, and in particular, it is difficult to perform a widening work on a slope with a strong gradient.
[0003]
As a method for widening the existing road on the slope, for example, there is a method of widening the road to a portion of the existing road where the mountain side slope is cut. However, in this method, not only a large amount of earth and sand is generated, but if the slope is steep, the mountain side slope may not be cut.
As a technique for solving these problems, for example, a widening road construction method disclosed in Japanese Patent Laid-Open Nos. 10-227002 and 2000-282403 is known.
[0004]
Among them, the widening road construction method disclosed in Japanese Patent Application Laid-Open No. 10-227002 is a method in which a plurality of

foundation piles

103 and 104 are provided on each of the mountain side end and the valley side end of the existing road 101 as shown in FIG. The heads of these

foundation piles

103 and 104 are joined with a foundation girder 105 having a protruding girder 106 extending horizontally from the existing road 101 toward the valley side, and are extended. A floor slab 107 is placed on a girder 106, and a pavement 108 is applied on the floor slab 107 to construct a widened road 102 on the valley side of the existing road 101.
[0005]
Moreover, as shown in FIG. 17, the construction method of the widening road disclosed by Unexamined-Japanese-Patent No. 2000-282403 places a some foundation pile 201 in the valley side of the existing road (not shown), and this foundation The pile head block 202 is joined onto the pile 201, and the grading girder 203 is connected and joined to the pile head block 202 with the horizontal girder 203b between the grading portions 203a. The grading portions 203a of the girders 203 are joined and connected by a plurality of main girders 204, and a floor slab (not shown) is placed on the grading girders 203 and the main girders 204 to construct a widened portion, Then, boundary bonding between the existing road and the widened portion is performed, and a widened road (not shown) is constructed by paving on the floor slab.
[0006]
[Problems to be solved by the invention]
However, these conventional widening road construction methods have the following problems.
That is, in the construction method of a widening road disclosed in Japanese Patent Laid-Open No. 10-227002,

foundation piles

103 and 104 are placed on the existing road 101 itself, and the heads of the

foundation piles

103 and 104 are placed over the overhanging girder. Since the floor slab 107 is mounted on the overhanging girder 106 and the widening road 102 is constructed by connecting with the foundation girder 105 having 106, the pile driving machine, the foundation girder 105, and the floor slab 107 are constructed. It was necessary to place all heavy machinery and foundation girder 105 etc. on the existing road 101. For this reason, the existing road 101 is blocked by heavy machinery or the like, and traffic blockage cannot be avoided.
[0007]
Moreover, even in the construction method of the widening road disclosed in Japanese Patent Application Laid-Open No. 2000-282403, a pile driving machine for placing the foundation pile 201, a heavy machine for constructing the

girders

203 and 204, a floor slab, and the like Must be placed on the existing road, and traffic blockage could not be avoided.
In particular, in mountainous areas, etc., blocking existing roads necessitated long detours in traffic, which caused great inconvenience to neighboring residents. In addition, when it is not possible to set up a detour substantially, it is necessary to manage the work process by repeatedly blocking the traffic and going back and forth, which not only inconveniences the residents, but also the road construction work itself is a heavy machine. The work was extremely inefficient due to relocation and interruption of work.
[0008]
Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a widening road construction method that can avoid the need to block traffic when constructing wide roads.
[0009]
[Means for Solving the Problems]
In order to solve the above problem, the construction method of the widening road according to claim 1 of the present invention is arranged along the existing road on the valley side of the existing road existing on the sloped land via the boundary joint portion. In the construction method of the widening road to be constructed, on the valley side of the existing road, while securing the traffic of the existing road, a pier body composed of piles, girders, lining receiving girders, and lining plates is provided by a manual construction method. After the construction of the pier body is completed, the road traffic is switched from the existing road to the pier body, and the boundary joint is constructed. After the boundary joint is constructed, the road traffic Switching from the pier body to the existing road, removing the lining plate and lining receiving girder, constructing a floor slab on the girder and paving on the floor slab to construct a widening road; It is characterized by comprising.
[0010]
According to the construction method of this widening road, while securing the traffic of the existing road, the construction of the pier body consisting of piles, girders, lining receiving girders, and lining boards is carried out by the method described on the valley side of the existing road, After the construction of the pier body is completed, the road traffic is switched from the existing road to the pier body, and the boundary junction is constructed. After that, switch the road traffic from the pier body to the existing road, remove the lining plate and the lining support girder, construct the floor slab on the girder and pave on the floor slab to construct the widening road. ing. Therefore, it is possible to avoid the need to block traffic when constructing a widening road.
[0011]
Moreover, the construction method of the widening road which concerns on Claim 2 among this invention WHEREIN: In the invention of Claim 1, the process of constructing | assembling the said boundary junction part was excavated while excavating the valley side slope of the said existing road A step of installing an overhanging girder extending to the excavation part on the girder, a step of installing an end floor girder between the overhanging girders, a step of constructing a earth retaining wall in the excavation part, and the earth retaining wall And a step of constructing a floor slab on the end floor girder and the overhanging girder and pavement on the floor slab.
[0012]
According to this widening road construction method, after constructing the main body of the pier, excavating the valley side slope of the existing road and laying the overhanging girder extending to the excavated excavated part on the girder, the end between the overhanging girder By installing a floor girder, building a retaining wall in the excavation part, constructing a floor slab on the retaining wall, end floor girder, and overhanging girder, and paving the floor slab, Can be built. At this time, it is not necessary to block traffic.
[0013]
In addition, in claim 1, the “hand-drawn construction method” means that a pile, a girder, a lining receiving girder, and a lining plate are placed in the order of a pile, a girder, a lining receiving girder, and a lining plate by a heavy machine such as a pile driving machine on a starting base. After the construction of the pier body for the span, the heavy machinery is advanced on the lining plate of the pier body for the one span to construct the pier body for the next span. The heavy machinery is advanced on the lining plate of the pier body for the next span, and the construction of the pier body for the next span is further advanced, and this operation is repeated, and the pier body having a plurality of spans is formed on the valley side of the existing road. The construction method to be applied.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional perspective view showing an existing road, a boundary junction, and a widened road. FIG. 2 is a perspective view for explaining members constituting the pile, the girder, and the floor slab.
As shown in FIG. 1, a widening road 1C is constructed along the existing road 1A via a boundary junction 1B on the valley side of the existing road 1A that is already installed on an inclined land.
[0015]
The widening road 1C includes a plurality of piles 3 driven along the existing road 1A on the valley-side slope 2 of the existing road 1A, and a girder 6 installed so as to bridge the piles 3 on these piles 3. The floor slab 7 constructed on the girder 6 and the pavement 8 constructed on the floor slab 7 are constructed.
Here, as shown in FIG. 2, each pile 3 is composed of a foundation pile 3a such as a steel pipe pile placed on the ground and a pile head block 3b joined on the foundation pile 3a. In addition, the girder 6 is connected between the grading girder 4 which is connected between the grading parts 4a placed and joined on the pile head block 3b by the horizontal girder 4b and the grading part 4a in the direction along the existing road 1A. And the main girder 5. Furthermore, the floor slab 7 is configured by placing concrete on, for example, an I-shaped steel lattice floor slab 7a.
[0016]
Next, a construction method of the widening road 1C will be described with reference to FIGS. Fig. 3 is a schematic cross-sectional view seen from the front showing the state where the pier body is being constructed. Fig. 4 is a diagram for explaining the manual construction method. (A) is when a heavy machine such as a pile driver is at the starting base. Schematic side view showing the working state, (B) is a schematic side view showing the working state when the heavy equipment is on a predetermined span of the pier body, and (C) is a state where the heavy equipment is working on the final span of the pier body. It is a schematic side view which shows. FIG. 5 is a schematic side view for specifically explaining a working state when a heavy machine such as a pile driving machine is on a predetermined span of the pier body in the manual construction method. FIG. 6 is a schematic cross-sectional view seen from the front showing a state in which the construction of the pier body is completed and the road traffic is switched to the pier body. FIG. 7 is a schematic cross-sectional view seen from the front showing a state in which a valley slope at the boundary junction is excavated with an excavator on an existing road. FIG. 8 is a cross-sectional view seen from the front showing a state in which an overhanging girder is installed by a heavy machine on an existing road. 9A and 9B show the installation state of the overhanging girder with respect to the horizontal beam, where FIG. 9A is a plan view, FIG. 9B is a front view, and FIG. 9C is a bottom view of the upper wall portion of the overhanging beam and the upper wall portion of the horizontal beam. . FIG. 10 is a schematic cross-sectional view seen from the front showing a state where end floor girders are installed by heavy machinery on an existing road. FIG. 11 is an arrow view as seen from the direction of arrow A in FIG. FIG. 12 is a schematic cross-sectional view seen from the front showing a state in which concrete is placed with a concrete mixer on an existing road and a retaining wall is constructed in the excavation part. FIG. 13 is a schematic cross-sectional view seen from the front showing a state in which the floor slab is constructed on the retaining retaining wall, the end floor girder, and the overhanging girder at the boundary joint portion and is paved on the floor slab. FIG. 14 is a schematic cross-sectional view seen from the front showing a state in which the lining slab and the lining plate are removed and the floor slab is constructed on the grading girder and the main girder and pavement is performed on the floor slab. FIG. 15 is a schematic cross-sectional view seen from the front showing a state in which the rails installed on the pavement at the boundary junction are removed and the widened road is completed.
[0017]
In order to construct the widening road 1C, first, as shown in FIG. 3, the pile pier body 20 is constructed by a handwritten construction method while securing the traffic of the existing road 1A on the valley side of the existing road 1A already installed on the slope. Install. In FIG. 3, the vehicle 50 can pass on the existing road 1A. The pier body 20 is placed on the pile head block 3b, a plurality of foundation piles 3a such as steel pipe piles placed on the ground along the existing road 1A, a pile head block 3b joined on the foundation pile 3a.・ Installed on the main girder 5, the girder girder 4 that connects the gating points 4 a to be joined with the horizontal girder 4 b, the main girder 5 that connects the gating points 4 a in the direction along the existing road 1 </ b> A. The lining receiving girder 12 and a lining plate 13 installed on the lining receiving girder 12 have a multi-span configuration.
[0018]
As shown in FIG. 4 (A), this manual construction method is performed on the valley side of the existing road 1A by a heavy machine C such as a pile driving machine on the departure base A, to the foundation pile 3a, the pile head block 3b, After the construction of the main body 20 for one span in the order of the grading girder 4, the main girder 5, the lining receiving girder 12, and the lining board 13, the heavy machine C is used as the lining board for the main body 20 for one span. 13, the construction of the pier main body 20 for the next span is carried out, and after this construction is completed, the heavy machinery C is advanced onto the lining plate 13 of the pier main body 20 for the next span. The construction of the pier body 20 for the span is advanced, and as shown in FIGS. 4B and 4C, this operation is repeated to construct the pier body 20 for the entire span. When the construction of the main pier body 20 for the final span is completed, the heavy equipment C such as a pile driving machine moves to the final terminal B. In the manual construction method, the pile head block 3b is joined to the head of the foundation pile 3a after the foundation pile 3a is driven by the heavy machinery C, and the graded portion 4a of the grading girder 4 is placed on the pile head block 3b by the heavy machinery C. Is mounted on the pile head block 3b by welding, and the main girder 5 is disposed between the graded portions 4a by the heavy machinery C, and the main girder 5 and the graded portion 4a are attached by a high-strength bolt. The lining receiving girder 12 is placed on the grading portion 4 a by the heavy machine C and the lining plate 13 is placed on the lining receiving girder 12.
[0019]
After the construction of the pier main body 20 is completed, as shown in FIG. 6, the road traffic is switched from the existing road 1 </ b> A to the pier main body 20 so that the vehicle 50 can pass over the lining plate 13 of the pier main body 20.
And after switching road traffic from the existing road 1A to the pier main body 20, construction of the boundary junction part 1B is performed. Specifically, as shown in FIG. 7, the excavator D is advanced on the existing road 1A, and the excavator D excavates the valley-side slope 2 of the existing road 1A corresponding to the boundary joint 1B. By this excavation, the excavation part 14 is formed on the shoulder of the existing road 1A.
[0020]
After the excavation part 14 is formed, as shown in FIG. 8, a plurality of overhanging girders 15 are positioned at the end part on the excavation part 14 side of the cross beam 4b of the grading girder 4 by the heavy machine C on the existing road 1A. Each overhanging girder 15 is installed on the end of the horizontal girder 4b by the contact plate 16 and the high strength bolt 17. As shown in FIG. 9, each overhanging girder 15 connects an upper wall portion 15a and a lower wall portion 15b extending in parallel with each other along the extending direction of the cross beam 4b, and an upper wall portion 15a and a lower wall portion 15b. As shown in FIG. 9, the upper wall portion of the cross beam 4b and the upper wall portion 15a of the overhanging beam 15, the lower wall portion of the cross beam 4b and the lower wall portion of the overhanging beam 15 are best constructed. 15 b and the connecting wall portion of the cross beam 4 b and the connecting wall portion 15 c of the overhanging girder 15 are joined by the attachment plate 16 and the high strength bolt 17. In order to join the overhanging beam 15 to the horizontal beam 4b, other methods such as welding may be used.
[0021]
After the overhanging girder 15 is installed, the end floor girder 18 is installed between the ends of each overhanging girder 15 by the heavy machine C on the existing road 1A as shown in FIG. As shown in FIG. 11, each end floor girder 18 includes an upper wall portion 18a and a lower wall portion 18b extending in parallel to each other along a direction orthogonal to the overhanging girder 15, and an upper wall portion 18a and a lower wall portion 18b. The connecting wall portion 18c is connected to the plate portion 15d formed at the tip of each overhanging girder 15 and the connecting wall portion 18c by the attachment plate 19 and the high strength bolt 22. In order to join the end floor girder 18 to the overhanging girder 15, other methods such as welding may be used. The overhanging girder 15 and the end floor girder 18 function as a formwork for placing concrete in order to construct a retaining wall 9 for retaining the earth, which will be described later.
[0022]
After the end floor girder 18 is installed, as shown in FIG. 12, the concrete retaining wall 9 is constructed by placing concrete in the excavation part 14 with the concrete mixer E on the existing road 1A. After the earth retaining wall 9 is constructed, as shown in FIG. 13, the floor slab 10 is constructed on the earth retaining wall 9, the end floor girder 18, and the overhanging girder 15, and the pavement 11 is performed on the floor slab 10. . Thereby, the boundary junction 1B is constructed. At this time, the vehicle 50 can still pass over the lining plate 13 of the pier body 20.
[0023]
After the boundary junction 1B is completed, as shown in FIG. 14, the rail 19 is installed on the pavement 11 along the existing road 1A, and then the road traffic is switched to the existing road 1A. Thereby, the vehicle 50 can pass on the existing road 1A. Thereafter, the lining plate 13 and the lining receiving girder 12 are removed over the entire span, the floor slab 7 is constructed on the grading girder 4 and the main girder 5, and the pavement 8 is performed on the floor slab 7. And as shown in FIG. 15, the rail 19 is removed and the wide road 1C is completed, and the vehicle 50 can pass on the existing road 1A and the wide road 1C.
[0024]
In the construction method of the widening road 1C described above, the pile 3, the girder 6, the lining receiving girder 12, and the lining board 13 are described by the method described in the valley side of the existing road 1A while securing the traffic of the existing road 1A. After the construction of the pier main body 20 is completed and the construction of the pier main body 20 is completed, the road traffic is switched from the existing road 1A to the pier main body 20 to construct the boundary junction 1B. Switch to the existing road 1A, remove the lining plate 13 and the lining receiving girder 12, construct the floor slab 7 on the girder 6, and perform the pavement 8 on the floor slab 7, so the widening road It is possible to avoid the need to block traffic during the construction of 1C.
[0025]
【Example】
In the construction work of the wide road with a length of 100 m, the construction period and traffic interception period by the construction method when the existing existing road was traffic intercepted were compared with the construction period and traffic interception period by the construction method of the present invention.
The results are shown in Table 1.
[0026]
[Table 1]

[0027]
Referring to Table 1, in the case of the conventional construction method, the total construction period for pile and girder construction, floor slab construction, and boundary joint construction is 7 months. A major hindrance to lifeline occurred.
On the other hand, in the case of the construction method of the present invention, the total construction period of pile and girder construction, floor slab construction, and boundary joint construction is 8 months, which is one month longer than the conventional construction method. There is no need to block the road, so there is no hindrance to the surrounding residents' lifeline, and widening roads can be constructed while securing traffic.
[0028]
【The invention's effect】
As explained above, according to the construction method of the widening road according to claim 1 of the present invention, piles, girders, lining girder by the construction method described on the valley side of the existing road while securing the traffic of the existing road. After the construction of the pier body composed of the lining plate and the construction of the pier body is completed, the road traffic is switched from the existing road to the pier body, and the boundary joint portion is constructed. After that, switch the road traffic from the pier body to the existing road, remove the lining plate and the lining support girder, construct the floor slab on the girder and pave on the floor slab to construct the widening road. Therefore, it is possible to avoid the need to block traffic when constructing widening roads.
[0029]
Moreover, according to the construction method of the widening road which concerns on Claim 2 among this invention, in the invention of Claim 1, the process of constructing | assembling the said boundary junction part excavates the valley side slope of the said existing road, and excavates A step of laying an overhanging girder extending to the excavated portion, a step of laying an end floor girder between the overhanging girders, a step of building a retaining wall in the excavation portion, and the earth retaining Including the step of constructing a floor slab on the retaining wall, the end floor girder and the overhanging girder and paving on the floor slab, and after excavating the valley side slope of the existing road after constructing the pier body The overhanging girder that extends to the excavated excavation part is installed on the girder, the end floor girder is installed between the overhanging girders, and the earth retaining wall is constructed in the excavation part, the earth retaining wall, the end floor girder and the overhang By constructing the floor slab on the girder and paving on the floor slab, construct the boundary joint Door can be. At this time, it is not necessary to block traffic.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional perspective view showing an existing road, a boundary junction, and a widened road.
FIG. 2 is a perspective view for explaining members constituting a pile, a girder, and a floor slab.
FIG. 3 is a schematic cross-sectional view seen from the front showing a state in which a pier body is being constructed.
4A and 4B are diagrams illustrating a manual construction method. FIG. 4A is a schematic side view showing a working state when a heavy machine such as a pile driving machine is located at a starting base, and FIG. (C) is a schematic side view which shows the state which the heavy machine is working on the last span of a pier main body.
FIG. 5 is a schematic side view for specifically explaining a working state when a heavy machine such as a pile driving machine is on a predetermined span of the pier body in the manual construction method.
FIG. 6 is a schematic cross-sectional view seen from the front showing a state where construction of the pier body is completed and road traffic is switched to the pier body.
FIG. 7 is a schematic cross-sectional view seen from the front showing a state where a valley slope at a boundary junction is excavated with an excavator on an existing road.
FIG. 8 is a cross-sectional view seen from the front showing a state in which an overhanging girder is installed by a heavy machine on an existing road.
FIGS. 9A and 9B show the installation state of the overhanging girder with respect to the cross beam, where FIG. 9A is a plan view, FIG. 9B is a front view, and FIG. 9C is a bottom view of the upper wall portion of the overhanging beam and the upper wall portion of the cross beam. is there.
FIG. 10 is a schematic cross-sectional view seen from the front showing a state where end floor girders are installed by heavy equipment on an existing road.
FIG. 11 is an arrow view seen from the direction of arrow A in FIG.
FIG. 12 is a schematic cross-sectional view seen from the front showing a state in which concrete is placed with a concrete mixer on an existing road and a retaining wall is constructed in the excavation part.
FIG. 13 is a schematic cross-sectional view seen from the front showing a state in which a floor slab is constructed on the earth retaining retaining wall, the end floor girder, and the overhanging girder at the boundary joint portion, and pavement is performed on the floor slab.
FIG. 14 is a schematic cross-sectional view seen from the front showing a state in which a slab is placed on the slab while the lining receiving girder and the lining plate are removed and the floor slab is constructed on the siding girder and the main girder.
FIG. 15 is a schematic cross-sectional view seen from the front showing a state in which a railroad installed on the pavement at the boundary junction is removed and a widened road is completed.
FIG. 16 is a schematic cross-sectional view showing a construction method for a widened road according to a conventional example.
FIG. 17 is a schematic cross-sectional view showing another method for constructing a widening road according to another example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS

1A Existing road

1B Boundary junction

1C Widening road 2 Valley side slope 3 Pile 3a Foundation pile 3b Pile head block 4 Girder 4a Girder 4b Horizontal girder 5 Main girder 6 Girder 7 Floor slab 7a I-shaped steel lattice slab 8 Pavement 9 Earth retaining wall 10 Floor slab 11 Pavement 12 Covering girder 13 Covering plate 14 Excavation part 15 Overhanging girder 15a Upper wall part 15b Lower wall part 15c Connection wall part 15d Plate part 16 Attachment plate 17 High strength bolt 18 End floor girder 18a Upper wall part 18b Lower wall part 18c Connection wall part 19 Rail 20 Pier body 21 Joint plate 22 High-strength bolt 50 Vehicle 101 Existing road 102

Wide road

103, 104 Foundation pile 105 Foundation girder 106 Overhanging girder 107 Floor slab 108 Pavement 201 Foundation pile 202 Pile head block 203 Rating girder 203a Rating point 203b Horizontal girder 204 Main girder A Starting base B Termination base C Heavy machinery D Excavator E Concrete mixer

Claims

In the construction method of the widening road that constructs the widening road along the existing road via the boundary junction on the valley side of the existing road that is already installed in the sloped area,
On the valley side of the existing road, while securing the traffic of the existing road, a step of constructing a pier body made of a pile, a girder, a lining girder, and a lining board by a manual construction method;
After the construction of the pier body is completed, the road traffic is switched from the existing road to the pier body, and the boundary junction is constructed,
After the boundary joint is constructed, the road traffic is switched from the pier main body to the existing road, the lining plate and the lining support girder are removed, and the floor slab is constructed on the girder and A method for constructing a widening road, comprising the step of paving the road and constructing a widening road.

The step of constructing the boundary joint includes the step of excavating the valley side slope of the existing road and laying an overhanging girder extending to the excavated excavated portion on the girders, and an end floor girder between the overhanging girders. A step of constructing, a step of constructing a retaining wall in the excavation part, a step of constructing a floor slab on the retaining wall, the end floor girder, and the overhanging girder, and paving on the floor slab The construction method of the widening road of Claim 1 characterized by the above-mentioned.