JP4956332B2 - Bridge girder replacement method - Google Patents

Bridge girder replacement method Download PDF

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JP4956332B2
JP4956332B2 JP2007220645A JP2007220645A JP4956332B2 JP 4956332 B2 JP4956332 B2 JP 4956332B2 JP 2007220645 A JP2007220645 A JP 2007220645A JP 2007220645 A JP2007220645 A JP 2007220645A JP 4956332 B2 JP4956332 B2 JP 4956332B2
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JP2009052306A (en
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清治郎 松本
昇 平野
孝 加々美
聖司 谷口
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鹿島建設株式会社
盟和工業株式会社
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本発明は、道路橋、鉄道橋などの橋梁において、旧桁を撤去して新桁を架設する橋桁の架替工法に関するものである。   The present invention relates to a bridge girder replacement method in which a new girder is constructed by removing an old girder in a bridge such as a road bridge and a railway bridge.
道路橋や鉄道橋などにおいては、古くなった既設の橋梁を新しい橋梁に架け替えることが行われており、そのための種々の工法が提案されている。例えば、特許文献1には、2つの橋脚間において旧桁の下に配置した新桁を大型のジャッキでジャッキアップすることで、旧桁を押し上げて2つの橋脚から分離し、旧桁を撤去した後、新桁を2つの橋脚間に架設する工法が提案されている。   In road bridges, railway bridges, etc., existing bridges that have become old are replaced with new bridges, and various construction methods have been proposed. For example, in Patent Document 1, a new girder placed under an old girder between two piers is jacked up with a large jack so that the old girder is pushed up and separated from the two piers, and the old girder is removed. Later, a construction method to construct a new girder between two piers has been proposed.
また、列車や車両の運行を休止させる期間を短縮し、作業の煩雑化を低減する工法として、いわゆる横取り工法が提案されている。例えば、特許文献2には、旧桁は仮設の橋脚により支持させた状態で残しておき、橋脚の部分だけを先に新しく構築し、橋軸直角方向に延設配置した横取り用ガイド装置に沿って旧桁を一体的に横移動させて撤去し、予め別の場所で構築しておいた新桁を横移動させて設置する工法が提案されている。   In addition, a so-called pre-construction method has been proposed as a method for shortening the period of suspension of train and vehicle operations and reducing the complexity of work. For example, in Patent Document 2, an old girder is left in a state of being supported by a temporary bridge pier, and only the pier part is newly constructed first, and along a horizontal guide device extending in a direction perpendicular to the bridge axis. A method has been proposed in which an old girder is moved laterally and removed, and a new girder previously constructed in another place is moved laterally and installed.
図8に示すのは、従来の横取り工法の一例であり、公道上に架設された鉄道の橋梁部Aに適用した場合である。橋梁部Aの両側の公道上に作業構台50を設置し、旧桁の横移動撤去、新桁の横移動架設が行われる。作業構台50は多数の支持杭51で支持されている。   FIG. 8 shows an example of a conventional pre-construction method, which is applied to a bridge part A of a railway constructed on a public road. The work gantry 50 is installed on the public road on both sides of the bridge part A, and the old girder is removed and the new girder is installed. The work gantry 50 is supported by a number of support piles 51.
しかし、このような公道上に広範囲にわたって横取り架設用の作業構台を設置する場合、水道本管等の埋設物があり、また車両の進行を阻害するなどの点から、支持杭の打設場所が制限され、構台部材が増大するなどの問題がある。   However, when installing a work platform for horizontal installation on such a public road over a wide area, there are buried objects such as water mains, etc. There is a problem that the gantry member is limited.
このような問題を解決できるものとして縦取り工法が考えられる。例えば、特許文献3には、旧橋上および旧橋付近に荷卸しされた新橋構成部材を全体またはブロック毎に架設位置に移動して仮設し、旧橋の下部に足場等を構成する仮設材を添設し、新橋・旧橋・仮設材を多数の箇所でチェーンにより包囲して新橋で旧橋を支持した上で、旧橋をブロック毎に切断して搬出した後、新橋を架設位置に降下させて架設する工法等が提案されている。   A vertical construction method can be considered as a solution to such a problem. For example, in Patent Document 3, a new bridge component unloaded on and near the old bridge is temporarily moved by moving it to the erection position for the whole or every block, and a temporary material for forming a scaffolding or the like is formed below the old bridge. Attached, surrounded the new bridge, old bridge, and temporary material with chains in many places, supported the old bridge with the new bridge, cut the old bridge into blocks and carried it out, then lowered the new bridge to the installation position Proposed construction methods have been proposed.
特開2004−332222号公報JP 2004-332222 A 特開2006−193978号公報JP 2006-193978 A 特許第3655161号公報Japanese Patent No. 3655161
前述したように、従来の横取り工法では、作業構台の支持杭の打設場所が制限され、構台部材が増大するなどの問題がある。また、先行技術の縦取り工法の場合、旧桁と新桁を互いに仮設材として利用することにより、桁下空間利用制限などの条件がある場合に有効であるが、より安全で、より迅速で、より確実で、より安価な縦取り工法が望まれている。さらに、鉄道の橋梁部のように橋軸方向に細長い狭隘地においても縦取り工法を適用できることが望まれる。   As described above, in the conventional side construction method, there is a problem that the place for placing the support pile of the work gantry is limited and the gantry member is increased. In the case of the vertical cutting method of the prior art, the old girder and the new girder are used as temporary materials, which is effective when there are restrictions such as under-girder space usage restrictions, but it is safer and faster. There is a need for a more reliable and cheaper vertical method. Furthermore, it is desired that the vertical construction method can be applied even in a narrow and narrow area in the direction of the bridge axis like a bridge part of a railway.
本発明は、上記のような課題を解消すべくなされたものであり、道路橋や鉄道橋などの橋梁の架け替えにおいて、縦取り工法により安全・迅速・確実・安価に橋梁の架替施工を行うことができ、さらに橋軸方向に細長い狭隘地においても安全・迅速・確実・安価な架替施工が可能となる橋桁の架替工法を提供するものである。   The present invention has been made to solve the above-described problems, and in the replacement of bridges such as road bridges and railway bridges, the bridge replacement work can be performed safely, quickly, reliably, and inexpensively by the vertical construction method. In addition, the present invention provides a bridge girder replacement method that can be performed safely, quickly, reliably, and inexpensively in narrow narrow areas extending in the direction of the bridge axis.
本発明の請求項1の発明は、橋梁の旧桁を撤去して新桁を架設する橋桁の架替工法であり、新桁を橋軸方向の縦移動により旧桁上に仮設し、新桁の両端部を仮受け材で支持し、かつ、新桁に設置した吊り降ろし装置により旧桁を新桁から吊り下げて支持した状態で、前記吊り降ろし装置により旧桁を吊り降ろして撤去した後、新桁を降下させて架設位置に架設することを特徴とする橋桁の架替工法である。縦移動は、橋軸方向に沿って縦送りするいわゆる縦取りであり、横移動は、橋軸直角方向へ平行移動で横送りするいわゆる横取りである。   The invention of claim 1 of the present invention is a bridge girder replacement method in which the old girder of the bridge is removed and a new girder is installed, and the new girder is temporarily installed on the old girder by longitudinal movement in the direction of the bridge axis. After the old girder is suspended and removed by the above-mentioned lifting device, with both ends supported by the temporary support material and the old girder suspended from the new girder by the hanging device installed in the new girder. It is a bridge girder replacement method characterized by lowering the new girder and erection at the erection position. The longitudinal movement is so-called longitudinal feeding in which longitudinal feeding is performed along the bridge axis direction, and the lateral movement is so-called lateral feeding in which lateral feeding is performed by parallel movement in the direction perpendicular to the bridge axis.
本発明は、道路橋や鉄道橋などに適用されるものであり、従来の横取り作業構台が設置不可、桁下空間利用制限などの条件がある橋桁架替工事に特に有効である。図1に例示するように、新桁を縦取りによって旧桁上に仮設し(旧桁を仮設材として利用)、旧桁を新桁に反力を取って降下撤去し(新桁を仮設材として利用)、新桁を降下させて所定の架設位置にセットする。   The present invention is applied to road bridges, railway bridges, and the like, and is particularly effective for bridge girder replacement work where conditions such as conventional installation work platforms cannot be installed and under-girder space use restrictions are imposed. As shown in Fig. 1, the new girder is temporarily placed on the old girder by vertical cutting (the old girder is used as a temporary material), and the old girder is removed and removed from the new girder (the new girder is temporary material). ), Lower the new girder and set it to the specified installation position.
縦取りには、レールと油圧ジャッキ付き自走台車を用いることができる。なお、後述する横取りには、仮受けサンドル等で支持された横取りレールと自走台車を用いることができる。新桁の両端部には支持端部を付加し、この支持端部を油圧ジャッキ付き自走台車や仮受け材(仮受けサンドルと油圧ジャッキなど)で支持し、旧桁を降下撤去できるようにする(図1、図2参照)。吊り降ろし装置には、油圧ジャッキと吊りロッド等を用いることができる。旧桁の橋脚または橋台上に位置する両端部は降下に先立って切断除去しておき、旧桁は橋軸方向に沿って複数のブロックに分割し、ブロック毎に降下撤去する(図1、図2参照)。   A vertical carriage can use a self-propelled carriage with a rail and a hydraulic jack. In addition, the side rail which is supported by a temporary receiving sanddle or the like and a self-propelled cart can be used for the side rail described later. Support ends are added to both ends of the new girder, and the support end is supported by a self-propelled carriage with a hydraulic jack or a temporary receiving material (such as a temporary receiving sanddle and a hydraulic jack) so that the old girder can be lowered and removed. (See FIGS. 1 and 2). For the suspension device, a hydraulic jack and a suspension rod can be used. Both ends of the old girder pier or abutment are cut and removed prior to the descent, and the old girder is divided into a plurality of blocks along the direction of the bridge axis, and the descent is removed for each block (Fig. 1, Fig. 1). 2).
本発明では、橋軸方向の作業導線を活用し、新旧桁を互いに仮設材利用しているため、安全・迅速・確実・安価な架替施工が可能となる。特に、従来の横取り用の作業構台が設置不可、桁下空間利用制限などの条件がある橋桁架替工事に極めて有効に適用できる。さらに旧桁は新桁に反力を取って降下撤去するため、さらに安全・迅速・確実・安価な架替施工が可能となる。   In the present invention, work work in the direction of the bridge axis is utilized, and the new and old girders are mutually used as temporary materials, so that safe, quick, reliable, and inexpensive replacement work can be performed. In particular, it can be applied very effectively to bridge girder replacement work where conditions such as the conventional work platform for horizontal installation cannot be installed and under-girder space usage restrictions are imposed. In addition, the old girder takes the reaction force against the new girder and lowers and removes it, making it possible to perform safer, quicker, more reliable and cheaper replacement.
本発明の請求項2の発明は、請求項1に記載の橋桁の架替工法において、橋軸方向に沿って作業構台が設けられ、作業構台上で組み立てられた新桁を橋軸方向の縦移動により旧桁上に搬入することを特徴とする橋桁の架替工法である。   According to claim 2 of the present invention, in the bridge girder replacement method according to claim 1, a work gantry is provided along the bridge axis direction, and a new girder assembled on the work gantry is moved vertically in the bridge axis direction. It is a bridge girder replacement method characterized in that it is carried onto the old girder by movement.
鉄道の橋梁部などのように橋軸方向に細長い狭隘地では、線路等の脇に橋軸方向に細長い作業構台を設置し、この作業構台において新桁を組み立て、線路等の上に横取りし、次いで縦取りにより旧桁上に配置する。また、後述するように縦取りにより作業構台の横に搬送されてきた旧ホーム桁を作業構台上に横取りし、作業構台上で旧ホーム桁をブロック毎に切断して搬出する。   In narrow and narrow areas such as railway bridges, a work base that is elongated in the direction of the bridge axis is installed on the side of the railway, etc., a new girder is assembled on this work base, and the work is taken on the railway, etc. Next, it is arranged on the old girder by vertical cutting. Further, as will be described later, the old home girder that has been transported to the side of the work gantry by vertical cutting is taken on the work gantry, and the old home girder is cut into blocks on the work gantry and carried out.
本発明の請求項3の発明は、請求項1または請求項2のいずれかに記載の橋桁の架替工法において、橋桁の架け替えに先立って、旧桁の両端部を仮支承部材により支持した状態で既設の橋脚または橋台を撤去し、新たに橋脚または橋台を構築することを特徴とする橋桁の架替工法である。   According to claim 3 of the present invention, in the bridge girder replacement method according to claim 1 or 2, prior to the bridge girder replacement, both ends of the old girder are supported by temporary support members. It is a bridge girder replacement method characterized by removing an existing pier or abutment and constructing a new pier or abutment.
橋脚や橋台等の新設も併せて行う場合である。仮支承部材には仮受杭などを用い、橋脚等の新設後、新桁と旧桁とを吊り降ろし装置で連結した後、仮支承部材を撤去し、旧桁を降下撤去する(図2参照)。   This is the case where new construction of piers and abutments is also performed. Temporary support members, such as temporary piles, are used. After the construction of the piers, etc., the new girder and the old girder are connected by a lifting device, then the temporary support member is removed and the old girder is lowered and removed (see Fig. 2). ).
本発明の請求項4の発明は、請求項1から請求項3までのいずれか一つに記載の橋桁の架替工法において、旧桁の横に旧ホーム桁が架設されており、新桁の旧桁上への縦移動に先立って、旧ホーム桁を横移動により旧桁上へ配置し、旧桁上の旧ホーム桁を縦移動により橋軸方向に搬出し、旧桁の撤去及び新桁の架設が終了した後、新ホーム桁を縦移動により新桁上に配置し、横移動により新桁の側方に架設することを特徴とする橋桁の架替工法である。   The invention of claim 4 of the present invention is the bridge girder replacement method according to any one of claims 1 to 3, wherein an old home girder is installed next to the old girder, Prior to the vertical movement to the old girder, the old home girder is placed on the old girder by moving horizontally, the old home girder on the old girder is moved in the direction of the bridge axis by vertical movement, the old girder is removed, and the new girder This is a bridge girder replacement method characterized in that after the erection of the bridge girder is completed, the new home girder is placed on the new girder by vertical movement and is laid to the side of the new girder by lateral movement.
本発明は、鋼製やコンクリート製などの旧桁と鋼製やコンクリート製などの新桁の架け替えに適用することができるが、鉄道の橋梁部ではホーム桁の架け替えも併せて行うことができる。新桁の旧桁上への縦取りに先立って、旧ホーム桁を旧桁上に横取りし、次いで作業構台等へ縦取りすることにより撤去する(図3参照)。新ホーム桁は、新桁の架設・旧桁の撤去が終了した後、作業構台等から縦取りにより新桁上に配置し、次いで横取りにより新桁の横に架設する(図7参照)。   The present invention can be applied to the replacement of old girders such as steel and concrete and new girders such as steel and concrete, but it is also possible to replace home girders at the bridges of railways. it can. Prior to the vertical placement of the new girder on the old girder, the old home girder is taken on the old girder and then removed to the work base or the like (see FIG. 3). After the installation of the new girder and removal of the old girder is completed, the new home girder is placed on the new girder by vertical installation from the work gantry, etc., and then installed next to the new girder by horizontal acquisition (see FIG. 7).
本発明は、以上のような構成からなるので、次のような効果が得られる。   Since the present invention is configured as described above, the following effects can be obtained.
(1)新桁を縦取りによって旧桁上に仮設し、旧桁を新桁に反力を取って降下撤去するため、橋軸方向の作業導線の活用、新旧桁の双方仮設材利用により、安全・迅速・確実・安価な架替施工が可能となる。特に、従来の横取り用の作業構台が設置不可、桁下空間利用制限などの条件がある橋桁架替工事に極めて有効に適用できる。 (1) The new girder is temporarily installed on the old girder by vertical cutting, and the old girder is removed from the new girder by using the reaction force. Safe, quick, reliable, and inexpensive replacement work is possible. In particular, it can be applied very effectively to bridge girder replacement work where conditions such as the conventional work platform for horizontal installation cannot be installed and under-girder space usage restrictions are imposed.
(2)旧桁を新桁に反力を取って降下撤去するため、さらに安全・迅速・確実・安価な架替施工が可能となる。 (2) Since the old girder is removed from the new girder and removed, further safer, quicker, more reliable and cheaper replacement work is possible.
(3)作業構台を橋軸方向に沿って設置することができるため、橋軸方向に細長い狭隘地においても安全・迅速・確実・安価な架替施工が可能となる。 (3) Since the work gantry can be installed along the direction of the bridge axis, safe, quick, reliable, and inexpensive replacement work can be performed even in narrow and narrow areas.
以下、本発明を図示する実施形態に基づいて説明する。図1は、本発明の架替工法の基本構成を工程順に示したものである。図2〜図7は、具体的な例を工程順に示したものである。   Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 shows the basic configuration of the replacement method of the present invention in the order of steps. 2 to 7 show specific examples in the order of steps.
図1に示すように、橋脚(または橋台)1、1間に旧桁2が架設されており、この旧桁2から橋軸方向に所定の距離だけ離れた作業ヤードで新桁3を組み立てる。新桁3の両端部には、支持端部3aが接続されており、レール上等を自走できる油圧ジャッキ搭載の自走台車10により支持端部3aを支持し、組み立てられた新桁3を橋軸方向に縦移動させて旧桁2上に搬入し、新桁3を旧桁2の上に旧桁2と平行に仮設する。   As shown in FIG. 1, an old girder 2 is installed between piers (or abutments) 1 and 1, and a new girder 3 is assembled at a work yard separated from the old girder 2 by a predetermined distance in the bridge axis direction. Support ends 3a are connected to both ends of the new girder 3, and the support end 3a is supported by a self-propelled carriage 10 equipped with a hydraulic jack capable of self-propelling on a rail or the like. It is moved vertically in the direction of the bridge axis and carried onto the old girder 2, and the new girder 3 is temporarily installed on the old girder 2 in parallel with the old girder 2.
旧桁2の上方に位置した新桁3の両端の支持端部3aを仮受けサンドルと油圧ジャッキからなる仮受け材11で支持する。この状態で、新桁3の橋軸方向に所定の間隔をおいて配置した複数台の吊り降ろし装置12により旧桁2を吊り下げて支持する。吊り降ろし装置12には、例えばセンターホールジャッキ等の油圧ジャッキ13と吊りロッド14を用いる。油圧ジャッキ13は新桁3の上面に橋軸直角方向に一対で配置し、吊りロッド14の下部を旧桁2に接続し、油圧ジャッキ13で吊りロッド14を降下させる。   Support end portions 3a at both ends of the new beam 3 positioned above the old beam 2 are supported by a temporary receiving material 11 including a temporary receiving sanddle and a hydraulic jack. In this state, the old girder 2 is suspended and supported by a plurality of hanging devices 12 arranged at predetermined intervals in the bridge axis direction of the new girder 3. For the suspension device 12, for example, a hydraulic jack 13 such as a center hole jack and a suspension rod 14 are used. A pair of hydraulic jacks 13 are arranged on the upper surface of the new girder 3 in the direction perpendicular to the bridge axis, the lower part of the suspension rod 14 is connected to the old beam 2, and the suspension rod 14 is lowered by the hydraulic jack 13.
旧桁2を吊り降ろす前に、旧桁2の端部2a、2aを切断し橋脚1上から撤去する。旧桁2は、図示例の場合、橋軸方向に沿って2分割されており、片側の旧桁2を吊り降ろし装置12により運搬台車(ユニットキャリア)16上に吊り降ろし、搬出する。残りの旧桁2も同様に降下撤去し、搬出する。   Before the old girder 2 is suspended, the ends 2a and 2a of the old girder 2 are cut and removed from the pier 1. In the case of the illustrated example, the old girder 2 is divided into two along the bridge axis direction, and the old girder 2 on one side is hung on a transport carriage (unit carrier) 16 by a hanging device 12 and is carried out. The remaining old girder 2 is lowered and removed in the same manner.
次いで、新桁3の両端の支持端部3aを取り去り、新桁3を仮受けサンドルと油圧ジャッキで降下させて架設位置に架設する。新桁3の両端部は橋脚1上に支承で支持される。これにより、新旧桁の架け替えが終了する。   Next, the support end portions 3a at both ends of the new girder 3 are removed, and the new girder 3 is lowered by a temporary receiving sander and a hydraulic jack and is installed at the installation position. Both ends of the new girder 3 are supported on the pier 1 by bearings. Thereby, the replacement of the old and new digits is completed.
図2〜図7の具体例は、公道上に架設された鉄道の橋梁部に適用した場合である。また、高架駅における橋桁とホーム桁を架け替えする場合である。   The specific example of FIGS. 2-7 is a case where it applies to the bridge part of the railway constructed on the public road. In addition, the bridge girder and the platform girder at the elevated station are replaced.
さらに、図2に示すように、既設橋脚等も新しくする場合には、旧桁2の両端部を仮受杭20で支持し、既設橋脚1等を撤去し、新設橋脚6等を構築する。新桁3と旧桁2とを吊り降ろし装置12により連結し、旧桁2の両端部2aは切断して橋脚1上から撤去し、新桁2の両端部を橋脚1上の仮受けサンドルと油圧ジャッキからなる仮受け材11で支持する。その後、仮受杭20を撤去する。   Furthermore, as shown in FIG. 2, when the existing piers and the like are also renewed, both ends of the old girder 2 are supported by the temporary support piles 20, the existing piers 1 and the like are removed, and the new piers 6 and the like are constructed. The new girder 3 and the old girder 2 are connected by a hanging device 12, both end portions 2 a of the old girder 2 are cut and removed from the pier 1, and both end portions of the new girder 2 are temporarily received on the pier 1 It is supported by a temporary receiving material 11 made of a hydraulic jack. Then, the temporary pile 20 is removed.
図3に示すように、公道上の橋梁部Aは、高架駅の端部であり、旧桁2−1、2−2と、旧ホーム桁4−1、4−2が架設されており、旧桁2の橋軸方向に隣接する敷地内における線路の脇に線路と平行に縦取り架設用の作業構台30−1、30−2を設置する。この作業構台30には、門型クレーン31が設置されており、新桁の組み立て、旧桁の切断等が行われる。   As shown in FIG. 3, the bridge part A on the public road is an end of the elevated station, and the old girders 2-1 and 2-2 and the old home girders 4-1 and 4-2 are installed. Working gantry 30-1 and 30-2 for vertical installation are installed in parallel with the track on the side of the track in the site adjacent to the old girder 2 in the bridge axis direction. The work gantry 30 is provided with a portal crane 31 for assembling new girders, cutting old girders, and the like.
次のような手順で新旧桁の架け替えが行われる。なお、架け替えは、片線のみを閉鎖して片側ずつ行われる。図示例では、線路1側が先に施工される。また、公道が線路に対して傾斜しているため、横取りは公道に沿って斜めに平行移動させて行われる。   Replacement of old and new digits is performed in the following procedure. In addition, the replacement is performed one side by closing only one line. In the example of illustration, the track 1 side is constructed first. Moreover, since the public road is inclined with respect to the track, the pre-emption is performed by translating obliquely along the public road.
(1)図3に示すように、線路1側の作業構台30−1で新桁3−1を組み立てる。これと並行して、旧ホーム桁4−1をサンドル等で所定の高さまで上昇させ、横取りレールと自走台車により旧桁2−1上に横移動させる。旧桁2−1上の旧ホーム桁4−1を線路のレールと自走台車により作業構台側へ縦移動させ、線路2側の空いている作業構台30−2へ横取りレールと自走台車により横移動させる。作業構台30−2上で旧ホーム桁4−1をブロックに切断し、搬出する。 (1) As shown in FIG. 3, the new girder 3-1 is assembled on the work gantry 30-1 on the track 1 side. In parallel with this, the old home girder 4-1 is raised to a predetermined height with a sanddle or the like, and is laterally moved onto the old girder 2-1 by the preparatory rail and the self-propelled carriage. The old home girder 4-1 on the old girder 2-1 is moved vertically to the work gantry side by the rail of the track and the self-propelled carriage, and the vacant work gantry 30-2 on the side of the track 2 is moved by the pre-preparation rail and the self-propelled dolly. Move sideways. The old home beam 4-1 is cut into blocks on the work gantry 30-2 and carried out.
(2)図4に示すように、作業構台30−1上で組み立てた新桁3−1を横取りレールと自走台車により線路のレール上に横移動させ、線路のレールと自走台車10により縦移動させて旧桁2−1上に搬入し、両端部を仮受けサンドルと油圧ジャッキで支持することで仮設する(図2(c)参照)。 (2) As shown in FIG. 4, the new girder 3-1 assembled on the work gantry 30-1 is moved laterally on the rail of the track by the pre-preparation rail and the self-propelled cart, and the rail of the rail and the self-propelled cart 10 It is moved vertically and carried onto the old girder 2-1, and is temporarily installed by supporting both ends with a temporary receiving sanddle and a hydraulic jack (see FIG. 2 (c)).
(3)図5に示すように、新桁3−1の上に設置した吊り降ろし装置12により旧桁2−1を吊り下げて支持する。新桁3−1の上には、橋軸直角方向に沿う支持架台15を設置し、この上に油圧ジャッキ13を設置する。吊りロッド14は、新桁3−1を貫通させて旧桁2−1に接続する。旧桁2−1を吊り降ろし装置12により吊り降ろして撤去する。作業構台30−1では新ホーム桁5−1が組み立てられている。 (3) As shown in FIG. 5, the old girder 2-1 is suspended and supported by the hanging device 12 installed on the new girder 3-1. On the new girder 3-1, a support frame 15 is installed along the direction perpendicular to the bridge axis, and a hydraulic jack 13 is installed thereon. The suspension rod 14 is connected to the old beam 2-1 through the new beam 3-1. The old girder 2-1 is suspended by the suspension device 12 and removed. A new home girder 5-1 is assembled on the work platform 30-1.
(4)図6に示すように、新桁3−1の両端部を支持している橋脚上の仮受け材11(仮受けサンドルと油圧ジャッキ)により降下させ、橋脚上に支承で支持する。これにより新旧桁の架け替えが終了する。 (4) As shown in FIG. 6, the new girder 3-1 is lowered by the temporary support material 11 (temporary reception sanddle and hydraulic jack) on the pier supporting the both ends of the new girder 3-1 and supported by the support on the pier. This completes the replacement of the old and new digits.
(5)図7に示すように、作業構台30−1上で組み立てた新ホーム桁5−1を横取りレールと自走台車により線路のレール上に横移動させ、線路のレールと自走台車10により縦移動させ、新桁3−1上に配置する。新桁3−1上の新ホーム桁5−1を横取りレールと自走台車により新桁3−1の側方に横移動させ、降下させて新桁3−1に沿って架設する。 (5) As shown in FIG. 7, the new home girder 5-1 assembled on the work gantry 30-1 is moved laterally on the rail of the track by the pre-preparation rail and the self-propelled cart. Is moved vertically and placed on the new digit 3-1. The new home girder 5-1 on the new girder 3-1 is moved laterally to the side of the new girder 3-1 by the pre-rail and the self-propelled carriage, and is lowered and installed along the new girder 3-1.
以上により片側の架け替えが完了し、同じ要領で反対側の架け替えが実施される。   The replacement on one side is completed as described above, and the replacement on the opposite side is performed in the same manner.
なお、以上は鉄道橋の橋梁部に適用した例を示したが、これに限らず、道路橋その他の橋桁の架替に本発明を適用できることはいうまでもない。   In addition, although the example applied to the bridge part of a railway bridge was shown above, it cannot be overemphasized that this invention is applicable not only to this but replacement of a road bridge and other bridge girders.
本発明の架替工法の基本構成を工程順に示す側面図と断面図である。It is the side view and sectional drawing which show the basic composition of the replacement construction method of this invention in order of a process. 本発明の架替工法の具体的な例であり、橋脚の撤去・新設を伴う場合を示す側面図である。It is a specific example of the replacement construction method of this invention, and is a side view which shows the case where removal and new installation of a pier are accompanied. 本発明の架替工法の具体的な例であり、旧ホーム桁の撤去の工程を示す平面図と断面図である。It is a specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of removal of an old home girder. 本発明の架替工法の具体的な例であり、新桁の縦送りの工程を示す平面図と断面図である。It is a specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of the vertical feed of a new girder. 本発明の架替工法の具体的な例であり、旧桁の撤去の工程を示す平面図と断面図である。It is a specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of removal of an old girder. 本発明の架替工法の具体的な例であり、新桁の架設の工程を示す平面図と断面図である。It is the specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of erection of a new girder. 本発明の架替工法の具体的な例であり、新ホーム桁の縦送りの工程を示す平面図と断面図である。It is the specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of the vertical feed of a new home girder. 従来の横取り工法の一例を示す平面図である。It is a top view which shows an example of the conventional horizontal construction method.
符号の説明Explanation of symbols
1……橋脚(橋台)
2……旧桁
2a…端部
3……新桁
3a…支持端部
4……旧ホーム桁
5……新ホーム桁
6……新設の橋脚
10…自走台車
11…仮受け材
12…吊り降ろし装置
13…油圧ジャッキ
14…吊りロッド
15…支持架台
16…運搬台車
20…仮受杭
30…作業構台
1 …… Bridge pier (Abutment)
2 ... Old girder 2a ... End 3 ... New girder 3a ... Support end 4 ... Old home girder 5 ... New home girder 6 ... New bridge pier 10 ... Self-propelled carriage 11 ... Temporary receiving material 12 ... Hanging Unloading device 13 ... Hydraulic jack 14 ... Hanging rod 15 ... Supporting stand 16 ... Transport cart 20 ... Temporary pile 30 ... Working platform

Claims (4)

  1. 橋梁の旧桁を撤去して新桁を架設する橋桁の架替工法であり、
    新桁を橋軸方向の縦移動により旧桁上に仮設し、新桁の両端部を仮受け材で支持し、かつ、新桁に設置した吊り降ろし装置により旧桁を新桁から吊り下げて支持した状態で、前記吊り降ろし装置により旧桁を吊り降ろして撤去した後、新桁を降下させて架設位置に架設することを特徴とする橋桁の架替工法。
    It is a bridge girder replacement method in which the old girder of the bridge is removed and a new girder is installed,
    The new girder is temporarily installed on the old girder by longitudinal movement in the bridge axis direction, both ends of the new girder are supported by temporary receiving materials, and the old girder is suspended from the new girder by the suspension device installed in the new girder. A bridge girder replacement method, wherein the old girder is suspended and removed by the hanging device in a supported state, and then the new girder is lowered and installed at the installation position.
  2. 請求項1に記載の橋桁の架替工法において、橋軸方向に沿って作業構台が設けられ、作業構台上で組み立てられた新桁を橋軸方向の縦移動により旧桁上に搬入することを特徴とする橋桁の架替工法。   In the bridge girder replacement method according to claim 1, a work gantry is provided along the bridge axis direction, and a new girder assembled on the work gantry is carried onto the old girder by longitudinal movement in the bridge axis direction. The bridge girder replacement method is a feature.
  3. 請求項1または請求項2のいずれかに記載の橋桁の架替工法において、橋桁の架け替えに先立って、旧桁の両端部を仮支承部材により支持した状態で既設の橋脚または橋台を撤去し、新たに橋脚または橋台を構築することを特徴とする橋桁の架替工法。   In the bridge girder replacement method according to claim 1 or 2, prior to the bridge girder replacement, the existing piers or abutments are removed with both ends of the old girder supported by temporary support members. The construction method of the bridge girder characterized by constructing a new pier or abutment.
  4. 請求項1から請求項3までのいずれか一つに記載の橋桁の架替工法において、旧桁の横に旧ホーム桁が架設されており、新桁の旧桁上への縦移動に先立って、旧ホーム桁を横移動により旧桁上へ配置し、旧桁上の旧ホーム桁を縦移動により橋軸方向に搬出し、旧桁の撤去及び新桁の架設が終了した後、新ホーム桁を縦移動により新桁上に配置し、横移動により新桁の側方に架設することを特徴とする橋桁の架替工法。   In the bridge girder replacement method according to any one of claims 1 to 3, an old home girder is installed next to the old girder, and prior to the vertical movement of the new girder onto the old girder The old home girder is placed on the old girder by lateral movement, and the old home girder on the old girder is carried out in the direction of the bridge axis by vertical movement. After the removal of the old girder and the construction of the new girder are completed, the new home girder is completed. The bridge girder replacement method is characterized in that the bridge is placed on the new girder by vertical movement and laid on the side of the new girder by horizontal movement.
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