JP7213136B2 - Box girder construction method and construction system - Google Patents

Box girder construction method and construction system Download PDF

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JP7213136B2
JP7213136B2 JP2019089019A JP2019089019A JP7213136B2 JP 7213136 B2 JP7213136 B2 JP 7213136B2 JP 2019089019 A JP2019089019 A JP 2019089019A JP 2019089019 A JP2019089019 A JP 2019089019A JP 7213136 B2 JP7213136 B2 JP 7213136B2
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box girder
formwork
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正吾 塩塚
隆史 内山
利玄 小林
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Kajima Corp
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Description

本発明は、箱桁の施工方法および施工システムに関する。 The present invention relates to a box girder construction method and construction system.

箱桁橋は、断面形状を箱型とした主桁すなわち箱桁を有する橋梁であり、箱桁をコンクリート打設により構築する際の型枠は、ウェブの外型枠および内型枠、底版型枠、床版型枠に分かれている。このうちウェブの外型枠および内型枠は、セパレータによって互いを拘束し、コンクリートの打設圧に抵抗してその間隔を保持する構造となっている。 A box girder bridge is a bridge with a box-shaped main girder, that is, a box girder. It is divided into frame and floor slab formwork. Of these, the outer formwork and the inner formwork of the web are bound to each other by separators, and have a structure that resists the concrete placing pressure and maintains the gap therebetween.

箱桁の構築時は、底版型枠のセット後、ウェブの外型枠を組立て、箱桁の断面内に埋設する鉄筋等を配置し、ウェブの内型枠と床版型枠を組立てる。その後、コンクリートを打設してPC鋼材の緊張によるプレストレスを導入し、型枠を脱型する。 When constructing a box girder, after the bottom slab formwork is set, the outer formwork of the web is assembled, reinforcing bars to be embedded in the cross section of the box girder are placed, and the inner web formwork and floor slab formwork are assembled. After that, concrete is poured, prestress is introduced by tension of PC steel materials, and the formwork is removed.

箱桁は橋脚の頂部から橋軸方向に張出すように1ブロックずつ前方に構築してゆき、施工の進捗に応じて箱桁の既設部分の上で移動作業車(ワーゲン)を移動させる。特許文献1には、箱桁の既設部分の前方で箱桁を構築するとともに、更にその前方で箱桁の断面内に埋設する鉄筋を先組しておくことで、工期短縮を可能とした箱桁の施工方法が記載されている。 The box girders are constructed one block at a time forward so that they extend from the top of the piers in the direction of the bridge axis. In Patent Document 1, a box girder is constructed in front of the existing portion of the box girder, and the reinforcing bars to be buried in the cross section of the box girder are pre-assembled in front of the box girder, thereby shortening the construction period. The construction method of the girder is described.

特開2018-112027号公報Japanese Patent Application Laid-Open No. 2018-112027

現在、橋梁の施工には更なる工期短縮が求められており、上記のような箱桁橋も例外ではない。例えば特許文献1に示した方法では、先組した鉄筋をワーゲンの先端から吊り支持し、これを箱桁の既設部分側に引き寄せて箱桁の構築予定箇所に配置した後、型枠を組み立ててコンクリートを打設するが、型枠の組み立て、組みバラシに時間が掛かり、工期短縮の余地がある。 Currently, there is a demand for further shortening of the construction period for bridge construction, and the box-girder bridge described above is no exception. For example, in the method shown in Patent Document 1, the pre-assembled reinforcing bars are suspended from the tip of the wagen, drawn to the existing part of the box girder and arranged at the planned construction site of the box girder, and then the formwork is assembled. Concrete is placed, but it takes time to assemble and disassemble the formwork, so there is room for shortening the construction period.

その他、従来の方法ではコンクリートの打設圧に抵抗するためウェブ内外の型枠の間に多数のセパレータが必要になり、その配置に手間が掛かるという課題もある。またウェブの断面変化があると、都度セパレータの長さ調整も必要となる。さらに、セパレータの両端にはプラスチックコーンが設けられ、コンクリート打設後に後埋めされるが、この後埋め部が漏水やクラックの発生する要因となるという懸念もある。 In addition, the conventional method requires a large number of separators between the formwork inside and outside the web in order to resist the concrete placing pressure. Also, if the cross section of the web changes, it is necessary to adjust the length of the separator each time. Furthermore, plastic cones are provided at both ends of the separator, and are back-filled after concrete is poured, and there is concern that this back-filled portion may cause water leakage or cracks.

本発明は上記の問題に鑑みてなされたものであり、工期短縮が可能な箱桁の施工方法等を提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a box girder construction method and the like that can shorten the construction period.

前述した課題を解決するための第1の発明は、橋梁の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁のウェブの内面にセットされるウェブ内型枠とを含む施工システムを用い、箱桁の既設部分の前方に続けて箱桁を構築する箱桁の施工方法であって、箱桁の構築予定箇所の前方で組まれた鉄筋を箱桁の構築予定箇所に引き寄せて構築予定の箱桁の断面に当たる位置に配置する工程(a)と、前記ウェブ外型枠と前記ウェブ内型枠が箱桁の構築予定箇所に配置された状態で、箱桁の構築予定箇所にコンクリートを打設することで、箱桁の既設部分の前方に続けて箱桁を構築する工程(b)と、を有し、前記ウェブ外型枠と前記ウェブ内型枠は、箱桁の既設部分から前方に移動させて箱桁の構築予定箇所に配置され、コンクリートの打設時に、打設されたコンクリートにアンカーによって固定することを特徴とする箱桁の施工方法である。 A first invention for solving the above-mentioned problems is a construction including an outer web formwork set on the outer surface of the web of the box girder of a bridge and an inner web formwork set on the inner surface of the web of the box girder. A box girder construction method that uses a system to construct a box girder continuously in front of an existing part of the box girder, in which the reinforcing bars assembled in front of the planned construction location of the box girder are drawn to the planned construction location of the box girder. a step (a) of arranging at a position corresponding to the cross section of the box girder to be constructed; and a step (b) of constructing a box girder continuously in front of the existing portion of the box girder by pouring concrete into the box girder , wherein the web outer formwork and the web inner formwork are connected to the box girder. This method of constructing a box girder is characterized by moving forward from an existing portion, arranging the box girder at a planned construction site, and fixing the box girder to the placed concrete with an anchor when the concrete is poured .

本発明では、鉄筋先組工法と、予め組立てられウェブ内外にセットされる箱桁構築用の型枠を含む施工システムの組合せにより、工期短縮が可能な実用性のある手法を実現できる。 In the present invention, a practical method capable of shortening the construction period can be realized by combining the reinforcement pre-assembly method and a construction system including pre-assembled forms for box girder construction that are set inside and outside the web.

また、ウェブ内外の型枠を箱桁の既設部分から構築予定箇所に移動させることで型枠セットに掛かる時間を省略でき、ウェブ内外の型枠をアンカーにより箱桁の打設後のコンクリートに固定することでセパレータを無くすことが可能になり、セパレータの配置に手間が掛かったり、品質低下を招いたりすることがない。 In addition , by moving the formwork inside and outside the web from the existing part of the box girder to the planned construction site, the time required for setting the formwork can be reduced, and the formwork inside and outside the web is anchored to the concrete after the box girder is placed. By doing so, it becomes possible to eliminate the separator, and the arrangement of the separator does not take time and does not lead to deterioration in quality.

第2の発明は、橋梁の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁のウェブの内面にセットされるウェブ内型枠とを含む施工システムを用い、箱桁の既設部分の前方に続けて箱桁を構築する箱桁の施工方法であって、箱桁の構築予定箇所の前方で組まれた鉄筋を箱桁の構築予定箇所に引き寄せて構築予定の箱桁の断面に当たる位置に配置する工程(a)と、前記ウェブ外型枠と前記ウェブ内型枠が箱桁の構築予定箇所に配置された状態で、箱桁の構築予定箇所にコンクリートを打設することで、箱桁の既設部分の前方に続けて箱桁を構築する工程(b)と、を有し、前記ウェブ外型枠と前記ウェブ内型枠は、橋軸直角方向に移動可能であることを特徴とする箱桁の施工方法である。
本発明では、ウェブ内外の型枠を橋軸直角方向に移動可能としたシステム化を行うことにより、型枠のセットと脱型が容易になり、工期短縮が可能になる。
A second invention uses a construction system including an outer web formwork set on the outer surface of the web of a box girder of a bridge and an inner web formwork set on the inner surface of the web of the box girder. A box girder construction method in which a box girder is constructed continuously in front of a section of a box girder to be constructed by drawing reinforcing bars assembled in front of the planned construction location of the box girder to the planned construction location of the box girder. The step (a) of arranging the web outer formwork and the inner web formwork at the position where the box girder is planned to be constructed, and placing concrete at the planned construction position of the box girder. and a step (b) of constructing a box girder following the existing portion of the box girder, wherein the web outer formwork and the web inner formwork are movable in a direction perpendicular to the bridge axis . This is the construction method of the box girders.
In the present invention, by systematizing the formwork inside and outside the web so as to be movable in the direction perpendicular to the bridge axis, the formwork can be easily set and demolded, and the construction period can be shortened.

第3の発明は、橋梁の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁のウェブの内面にセットされるウェブ内型枠とを含む施工システムを用い、箱桁の既設部分の前方に続けて箱桁を構築する箱桁の施工方法であって、箱桁の構築予定箇所の前方で組まれた鉄筋を箱桁の構築予定箇所に引き寄せて構築予定の箱桁の断面に当たる位置に配置する工程(a)と、前記ウェブ外型枠と前記ウェブ内型枠が箱桁の構築予定箇所に配置された状態で、箱桁の構築予定箇所にコンクリートを打設することで、箱桁の既設部分の前方に続けて箱桁を構築する工程(b)と、を有し、前記ウェブ外型枠は、鉛直面内で変形可能であることを特徴とする箱桁の施工方法である。
これにより、ウェブ外型枠の脱型を容易に行うことができる。
A third invention uses a construction system including an outer web formwork set on the outer surface of the web of a box girder of a bridge and an inner web formwork set on the inner surface of the web of the box girder. A box girder construction method in which a box girder is constructed continuously in front of a section of a box girder to be constructed by drawing reinforcing bars assembled in front of the planned construction location of the box girder to the planned construction location of the box girder. The step (a) of arranging the web outer formwork and the inner web formwork at the position where the box girder is planned to be constructed, and placing concrete at the planned construction position of the box girder. , and a step (b) of constructing a box girder following the existing portion of the box girder, wherein the web outer formwork is deformable in a vertical plane. The method.
As a result, the web outer mold can be easily removed from the mold.

第4の発明は、橋梁の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁のウェブの内面にセットされるウェブ内型枠とを含む施工システムを用い、箱桁の既設部分の前方に続けて箱桁を構築する箱桁の施工方法であって、箱桁の構築予定箇所の前方で組まれた鉄筋を箱桁の構築予定箇所に引き寄せて構築予定の箱桁の断面に当たる位置に配置する工程(a)と、前記ウェブ外型枠と前記ウェブ内型枠が箱桁の構築予定箇所に配置された状態で、箱桁の構築予定箇所にコンクリートを打設することで、箱桁の既設部分の前方に続けて箱桁を構築する工程(b)と、を有し、前記施工システムは、箱桁の既設部分の上に配置され、箱桁の施工の進捗に応じて前方に移動するワーゲンと、前記ウェブ内型枠を、前記ワーゲンの移動とは別に、箱桁の既設部分から前方に移動させる移動部と、を有し、前記鉄筋は、橋軸方向に移動可能に前記ワーゲンから吊り支持され、前記ウェブ外型枠は、前記工程(a)の前に、前記ワーゲンの移動と共に箱桁の既設部分から前方に移動して箱桁の構築予定箇所に配置され、前記ウェブ内型枠は、前記工程(a)の後且つ前記工程(b)の前に、前記移動部により箱桁の既設部分から前方に移動して箱桁の構築予定箇所に配置されることを特徴とする箱桁の施工方法である
本発明では、ウェブ外型枠をワーゲンと共に移動させて先行設置し、ウェブ内型枠については、ワーゲンから吊り支持した鉄筋の引き寄せ後にワーゲンとは独立して後から移動させることにより、鉄筋の配置が容易になる。
A fourth invention uses a construction system including an outer web formwork set on the outer surface of the web of a box girder of a bridge and an inner web formwork set on the inner surface of the web of the box girder. A box girder construction method in which a box girder is constructed continuously in front of a section of a box girder to be constructed by drawing reinforcing bars assembled in front of the planned construction location of the box girder to the planned construction location of the box girder. The step (a) of arranging the web outer formwork and the inner web formwork at the position where the box girder is planned to be constructed, and placing concrete at the planned construction position of the box girder. and a step (b) of constructing a box girder successively in front of the existing portion of the box girder, wherein the construction system is arranged on the existing portion of the box girder, and according to the progress of construction of the box girder. and a moving part that moves the inner web formwork forward from the existing portion of the box girder separately from the movement of the wagen, and the reinforcing bars move in the bridge axis direction. The web outer formwork is suspended from the wagon so as to be possible, and the web outer formwork moves forward from the existing portion of the box girder along with the movement of the wagon before the step (a) and is placed at the planned construction site of the box girder. After the step (a) and before the step (b), the inner web formwork is moved forward from the existing portion of the box girder by the moving unit and placed at the planned construction location of the box girder. This is a method for constructing a box girder characterized by:
In the present invention, the outer web formwork is moved together with the wagen to be installed in advance, and the inner web formwork is moved independently of the wagen after the reinforcing bars suspended and supported from the wagen are drawn, thereby arranging the reinforcing bars. becomes easier.

前記施工システムは、箱桁の床版の下面に配置される床版型枠を有し、前記床版型枠は、前記ウェブ内型枠と共に箱桁の既設部分から前方に移動して箱桁の構築予定箇所に配置される。あるいは、前記床版型枠は、前記工程(a)の前に、箱桁の既設部分から前方に移動して箱桁の構築予定箇所に配置されてもよい。
床版型枠は、鉄筋の引き寄せ後、ウェブ内型枠と共に移動して箱桁の構築予定箇所に配置されるようにしてもよいし、鉄筋の引き寄せに先行して箱桁の構築予定箇所に配置されるようにしてもよい。どちらの方法を用いるかは施工条件その他によって定めることができる。
The construction system has a floor slab formwork arranged on the lower surface of the floor slab of the box girder, and the floor slab formwork is moved forward from the existing portion of the box girder together with the inner web formwork to form the box girder. will be placed at the planned construction location. Alternatively, the floor slab formwork may be moved forward from the existing portion of the box girder and placed at the planned construction location of the box girder before step (a).
The floor slab formwork may be moved together with the inner-web formwork after the reinforcing bars are pulled in and placed at the planned construction location of the box girder. You may make it arrange|position. Which method to use can be determined according to construction conditions and other factors.

の発明は、橋梁の箱桁の既設部分の前方に続けて箱桁を構築する際に用いる施工システムであって、箱桁の既設部分から前方に移動し、構築予定の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁の既設部分から前方に移動し、構築予定の箱桁のウェブの内面にセットされるウェブ内型枠と、前記ウェブ外型枠と前記ウェブ内型枠を箱桁の構築予定箇所に打設されたコンクリートに固定するアンカーと、を含むことを特徴とする施工システムである。 A fifth invention is a construction system used when constructing a box girder following an existing portion of a box girder of a bridge, moving forward from the existing portion of the box girder and moving the web of the box girder to be constructed. web outer formwork set on the outer surface of the box girder, web inner formwork moved forward from the existing portion of the box girder and set on the inner surface of the web of the box girder to be constructed, said web outer formwork and said web and an anchor for fixing the inner formwork to the concrete placed at the planned construction location of the box girder.

本発明により、工期短縮が可能な箱桁の施工方法等を提供することができる。 ADVANTAGE OF THE INVENTION By this invention, the construction method of a box girder etc. which can shorten a construction period can be provided.

箱桁4の施工システム100を示す図。The figure which shows the construction system 100 of the box girder 4. FIG. 箱桁4の施工システム100を示す図。The figure which shows the construction system 100 of the box girder 4. FIG. 箱桁4の施工方法を示す図。The figure which shows the construction method of the box girder 4. FIG. 箱桁4の施工方法を示す図。The figure which shows the construction method of the box girder 4. FIG. 箱桁4の施工方法を示す図。The figure which shows the construction method of the box girder 4. FIG. 箱桁4の施工方法を示す図。The figure which shows the construction method of the box girder 4. FIG. 箱桁4の施工方法を示す図。The figure which shows the construction method of the box girder 4. FIG. 箱桁4の施工方法を示す図。The figure which shows the construction method of the box girder 4. FIG. 箱桁4の施工方法を示す図。The figure which shows the construction method of the box girder 4. FIG. 箱桁4の施工方法の例。An example of the construction method of the box girder 4.

以下、図面に基づいて本発明の好適な実施形態について詳細に説明する。 Preferred embodiments of the present invention will now be described in detail with reference to the drawings.

(1.箱桁4の施工システム100)
図1、2は、本発明の実施形態に係る施工システム100を用いた箱桁4の施工途中の状態を示す図である。図1は箱桁4を側方から見た図であり、図2は箱桁4を図1の線A-Aに沿って見た図である。
(1. Construction system 100 for box girder 4)
1 and 2 are diagrams showing a state during construction of the box girder 4 using the construction system 100 according to the embodiment of the present invention. 1 is a side view of the box girder 4, and FIG. 2 is a view of the box girder 4 along the line AA in FIG.

箱桁4は、橋梁(箱桁橋)の橋脚5の頂部から橋軸方向に張出すように1ブロックずつ前方に構築される。以降、「前」というときは橋脚5から遠い方を指し、橋脚5に近い方を「後」というものとする。橋軸方向は平面における箱桁4の延伸方向をいい、図1の左右方向、図2の紙面法線方向に対応する。 The box girder 4 is constructed forward one block at a time so as to protrude in the bridge axis direction from the top of the bridge pier 5 of the bridge (box girder bridge). Hereinafter, the term "front" refers to the side farther from the pier 5, and the side closer to the pier 5 is referred to as the "rear". The direction of the bridge axis refers to the extending direction of the box girder 4 on a plane, and corresponds to the left-right direction in FIG. 1 and the normal direction to the paper surface of FIG.

本実施形態の施工システム100は、箱桁4の既設部分の前方に続けて箱桁4を構築する際に用いるものであり、ワーゲン1、型枠2等を有する。また本実施形態では、箱桁4の構築予定箇所のさらに前方の鉄筋先組エリアで予め鉄筋30を先組し、この鉄筋30を上記の構築予定箇所で箱桁4を構築する際に用いる。 The construction system 100 of the present embodiment is used when constructing a box girder 4 following an existing portion of the box girder 4, and has a wagen 1, a formwork 2, and the like. Further, in this embodiment, the reinforcing bars 30 are pre-assembled in advance in a reinforcing bar pre-assembling area further forward of the scheduled construction location of the box girder 4, and the reinforcing bars 30 are used when constructing the box girder 4 at the scheduled construction location.

ワーゲン1は箱桁4の既設部分の上に配置される移動作業車であり、箱桁4の施工の進捗に応じて前方に移動する。ワーゲン1は、フレーム10、上梁11等を有する。 The wagen 1 is a mobile working vehicle that is placed on the existing portion of the box girder 4 and moves forward according to the progress of construction of the box girder 4 . A wagon 1 has a frame 10, an upper beam 11, and the like.

図1に示すように、フレーム10は、略平行四辺形状のトラス構面が橋軸方向の鉛直面に沿って形成されるよう鋼材を組み合わせたものである。フレーム10の上辺はトラス構面から前方に延びるように延長しており、この延長部分を図中10aで示す。 As shown in FIG. 1, the frame 10 is made by combining steel materials so that a substantially parallelogram-shaped truss structure surface is formed along the vertical plane in the direction of the bridge axis. The upper side of the frame 10 extends forward from the truss structure surface, and this extended portion is indicated by 10a in the drawing.

フレーム10は、箱桁4の既設部分の上面に設置された橋軸方向のレール6上に配置される。フレーム10はレール6に沿って移動可能である。フレーム10の下辺の前端部はメインジャッキ13によりレール6上で支持される。またフレーム10をレール6に固定する固定部として、フレーム10の下辺の後端部にアンカージャッキ12が設けられる。 The frame 10 is arranged on rails 6 in the bridge axis direction installed on the upper surface of the existing portion of the box girder 4 . Frame 10 is movable along rails 6 . A front end portion of the lower side of the frame 10 is supported on the rail 6 by a main jack 13 . An anchor jack 12 is provided at the rear end portion of the lower side of the frame 10 as a fixing portion for fixing the frame 10 to the rail 6 .

図2に示すように、フレーム10は橋軸直角方向に複数(本実施形態では2つ)並べて配置され、それらのフレーム10上に橋軸直角方向の上梁11が架け渡される。橋軸直角方向は橋軸方向と平面において直角をなす方向であり、図1の紙面法線方向、図2の左右方向に対応する。 As shown in FIG. 2, a plurality of (two in this embodiment) frames 10 are arranged side by side in the direction perpendicular to the bridge axis, and an upper beam 11 is laid over the frames 10 in the direction perpendicular to the bridge axis. The direction perpendicular to the bridge axis is a direction perpendicular to the direction of the bridge axis in a plane, and corresponds to the direction normal to the paper surface of FIG. 1 and the left-right direction of FIG.

図1に示すように、上梁11は橋軸方向の前後に複数(本実施形態では2つ)配置され、後部の上梁11はメインジャッキ13の上方に位置し、前部の上梁11は箱桁4の既設部分の前方に位置する。 As shown in FIG. 1, a plurality of (two in this embodiment) upper beams 11 are arranged in the longitudinal direction of the bridge. is located in front of the existing portion of the box girder 4.

図2に示すように、型枠2は、ウェブ外型枠21、ウェブ内型枠22、底版型枠23、床版型枠24に分かれている。これらの型枠は、型枠パネルとその支持部を含んだ構成となっている。 As shown in FIG. 2 , the formwork 2 is divided into an outer web formwork 21 , an inner web formwork 22 , a bottom slab formwork 23 , and a floor slab formwork 24 . These formworks are configured to include formwork panels and their supports.

ウェブ外型枠21は、箱桁4のウェブ41の外面にセットされる型枠である。ウェブ41は橋軸方向に延伸する箱桁4の壁部であり、箱桁4の断面(橋軸方向と直角をなす断面)の両側に配置される。ウェブ外型枠21は、ウェブ41の外面に沿って配置される型枠パネル211を、その外側の支持部210によって支持した構成となっている。ここで「外」とは箱桁4の橋軸直角方向の中心から遠い方をいい、「内」とは箱桁4の橋軸直角方向の中心に近い方を指すものとする。 The web outer formwork 21 is a formwork set on the outer surface of the web 41 of the box girder 4 . The webs 41 are walls of the box girder 4 extending in the direction of the bridge axis, and are arranged on both sides of the cross section of the box girder 4 (the cross section perpendicular to the direction of the bridge axis). The web outer formwork 21 has a structure in which formwork panels 211 arranged along the outer surface of the web 41 are supported by support portions 210 on the outside thereof. Here, "outside" refers to the side farther from the center of the box girder 4 in the direction perpendicular to the bridge axis, and "inner" refers to the side closer to the center of the box girder 4 in the direction perpendicular to the bridge axis.

支持部210は、鉛直材212の上端部に外側へと延びる腕部213を設けて構成され、鉛直材212の上端部と腕部213の根元部が鉛直面内で回転可能に連結される。 The support portion 210 is configured by providing an arm portion 213 extending outward from the upper end portion of the vertical member 212, and the upper end portion of the vertical member 212 and the root portion of the arm portion 213 are rotatably connected in the vertical plane.

ウェブ外型枠21は、箱桁4の床版43のウェブ41より外側の部分(以下、床版43の翼部ということがある)の構築にも用いられる。そのため、型枠パネル211は、鉛直材212のウェブ41側にパネル受材215を介して取付けられるとともに、腕部213の上方にもパネル受材216を介して取付けられる。 The web outer formwork 21 is also used to construct the portion of the floor slab 43 of the box girder 4 outside the web 41 (hereinafter sometimes referred to as the wing portion of the floor slab 43). Therefore, the formwork panel 211 is attached to the web 41 side of the vertical member 212 via the panel support material 215 and is also attached above the arm portion 213 via the panel support material 216 .

腕部213の先端部と鉛直材212の間には、スピンドル(不図示)等の機構により長さ調節可能とした斜材214が設けられ、斜材214の長さ調節により、水平方向に対し所定の角度を成すように腕部213を傾斜させることができる。 A diagonal member 214 whose length can be adjusted by a mechanism such as a spindle (not shown) is provided between the tip of the arm 213 and the vertical member 212. By adjusting the length of the diagonal member 214, the horizontal Arm 213 can be tilted to form a predetermined angle.

鉛直材212は、傾斜部217によって外側に傾斜させることが可能である。傾斜部217は柱材2171、スライダ2172、斜材2173を有し、鉛直材212の下部がその外側に配置した柱材2171に取付けられる。スライダ2172は、柱材2171の下端部から外側へと延びるように設けられる水平方向の部材であり、前記と同様、柱材2171の下端部とスライダ2172の根元部が鉛直面内で回転可能に連結される。 The vertical members 212 can be angled outward by ramps 217 . The inclined portion 217 has a column member 2171, a slider 2172 and a diagonal member 2173, and the lower portion of the vertical member 212 is attached to the column member 2171 arranged outside. The slider 2172 is a horizontal member that extends outward from the lower end of the pillar 2171. As described above, the lower end of the pillar 2171 and the base of the slider 2172 are rotatable in the vertical plane. concatenated.

スライダ2172の先端部と柱材2171の間にも、スピンドル(不図示)等の機構により長さ調節可能とした斜材2173が設けられる。斜材2173の長さ調節により、柱材2171に取付けた鉛直材212を、鉛直方向に対して所定の角度を成すように傾斜させることができる。 A diagonal member 2173 whose length is adjustable by a mechanism such as a spindle (not shown) is also provided between the tip of the slider 2172 and the column member 2171 . By adjusting the length of the diagonal member 2173, the vertical member 212 attached to the column member 2171 can be inclined at a predetermined angle with respect to the vertical direction.

スライダ2172は橋軸直角方向に延びる水平方向のガイド218に取付けられており、スライダ2172がこのガイド218に沿って移動することで、ウェブ外型枠21を橋軸直角方向に移動させることが可能である。 The slider 2172 is attached to a horizontal guide 218 extending in the direction perpendicular to the bridge axis, and by moving the slider 2172 along this guide 218, the web outer formwork 21 can be moved in the direction perpendicular to the bridge axis. is.

ウェブ内型枠22は、箱桁4のウェブ41の内面にセットされる型枠である。ウェブ内型枠22は、ウェブ41の内面に沿って配置される型枠パネル221を、その内側の支持部220によって支持した構成となっている。 The inner web formwork 22 is a formwork set on the inner surface of the web 41 of the box girder 4 . The web inner formwork 22 has a structure in which formwork panels 221 arranged along the inner surface of the web 41 are supported by support portions 220 inside the formwork panels 221 .

支持部220は、鉛直材222の上端部に内側へと延びる水平方向の腕部223を設けて構成される。型枠パネル221は、鉛直材222のウェブ41側にパネル受材224を介して取付けられる。また両ウェブ内型枠22の支持部220の間にはサポート材25が架設される。 The support portion 220 is configured by providing a horizontal arm portion 223 extending inward at the upper end portion of a vertical member 222 . The formwork panel 221 is attached to the web 41 side of the vertical member 222 via the panel support member 224 . A support member 25 is installed between the support portions 220 of both web inner molds 22 .

本実施形態では、ウェブ外型枠21とウェブ内型枠22がアンカー50によりウェブ41のコンクリートに固定される。アンカー50としては例えばフォームタイ(登録商標)が用いられる。図中符号44はアンカー50の先端をねじ込む埋め込み式のインサートであり、予め型枠パネル211、221のウェブ41側の面に上下複数段に取付けておいたものが箱桁4のコンクリート打設時に当該コンクリート内に埋設される。 In this embodiment, the web outer formwork 21 and the web inner formwork 22 are fixed to the concrete of the web 41 by anchors 50 . For example, a form tie (registered trademark) is used as the anchor 50 . Numeral 44 in the drawing denotes an embedded insert into which the tip of the anchor 50 is screwed. It is buried in the concrete concerned.

また、コンクリート打設時には、両ウェブ外型枠21の前端部同士をつなぐように鋼棒等の胴締め材が取付けられ、これにより両ウェブ外型枠21の外側への膨らみが防止される。図1の符号28はこの胴締め材を示したものである。 When concrete is placed, a body tightening material such as a steel rod is attached to connect the front ends of both web outer forms 21, thereby preventing both web outer forms 21 from bulging outward. Reference numeral 28 in FIG. 1 indicates this body tightening material.

底版型枠23は、箱桁4の底版42の下面にセットされる型枠である。底版型枠23は、支持部230の底版42側に型枠パネル231を支持した構成となっている。支持部230は、H形鋼等の鋼材を用いた橋軸方向の桁材を複数平行に配置して形成される。 The bottom slab formwork 23 is a formwork set on the lower surface of the bottom slab 42 of the box girder 4 . The bottom slab formwork 23 has a structure in which a formwork panel 231 is supported on the bottom slab 42 side of the support portion 230 . The support part 230 is formed by arranging in parallel a plurality of girders in the bridge axis direction using steel materials such as H-shaped steel.

床版型枠24は、箱桁4の床版43のウェブ41より内側の部分の下面にセットされる型枠である。床版型枠24は、支持部240の床版43側に型枠パネル241を支持した構成となっている。 The floor slab formwork 24 is a formwork set on the lower surface of the portion inside the web 41 of the floor slab 43 of the box girder 4 . The floor slab formwork 24 has a structure in which a formwork panel 241 is supported on the floor slab 43 side of the supporting portion 240 .

支持部240はH形鋼などの鋼材を用いた橋軸直角方向の水平材であり、型枠パネル241は支持部240の上方にパネル受材242を介して取付けられる。この支持部240は、後述するようにウェブ内型枠22の腕部223をスライドさせるスライドレールとしても使用される。 The support part 240 is a horizontal member made of steel such as H-shaped steel, and is perpendicular to the bridge axis. This support portion 240 is also used as a slide rail for sliding the arm portion 223 of the web inner mold 22 as will be described later.

本実施形態では箱桁4のウェブ41と底版42の隅角部にハンチが設けられており、ウェブ内型枠22の型枠パネル221の下方にハンチ形成のための型枠パネル26がセットされる。さらに、ウェブ41の内側と床版43の隅角部でも、型枠パネル221の上端部と床版型枠24の型枠パネル241の端部の間に型枠パネル27がセットされる。型枠パネル26、27はいずれも着脱可能である。 In this embodiment, haunches are provided at the corners of the web 41 of the box girder 4 and the bottom slab 42, and a formwork panel 26 for forming the haunches is set below the formwork panel 221 of the web inner formwork 22. be. Further, the form panel 27 is set between the upper end of the form panel 221 and the end of the form panel 241 of the floor slab form 24 at the inner corner of the web 41 and the floor slab 43 . Both formwork panels 26 and 27 are removable.

図1、2に示すように、ワーゲン1からは、作業床7や下梁8、鉄筋架台9等が吊り支持される。 As shown in FIGS. 1 and 2, a work floor 7, a lower beam 8, a reinforcing frame 9, and the like are suspended from the vehicle 1. As shown in FIG.

作業床7は箱桁4の下方で水平方向に配置される床材であり、箱桁4の既設部分から鉄筋先組エリアまで橋軸方向に延びるように設けられる。 The working floor 7 is a floor material arranged horizontally under the box girder 4, and is provided so as to extend in the bridge axis direction from the existing portion of the box girder 4 to the reinforcing bar pre-laying area.

作業床7は、ワーゲン1の前後の上梁11の両端部から吊材141により吊り支持される。鉄筋先組エリアでは、鉄筋架台9を囲むように作業床7上に足場71が組み立てられ、作業床7の外周部には手摺72が設けられる。また、作業床7上には水平床73も設けられ、水平床73はジャッキ74により作業床7から支持される。図2に示すように、水平床73上には前記したガイド218が配置される。 The work floor 7 is supported by hanging members 141 from both ends of the front and rear upper beams 11 of the vehicle 1 . In the reinforcing bar pre-assembly area, a scaffolding 71 is assembled on the working floor 7 so as to surround the reinforcing bar frame 9 , and a handrail 72 is provided on the outer peripheral portion of the working floor 7 . A horizontal floor 73 is also provided on the work floor 7 , and the horizontal floor 73 is supported from the work floor 7 by jacks 74 . As shown in FIG. 2, the above guide 218 is arranged on the horizontal floor 73 .

下梁8は橋軸直角方向に延びる水平方向の梁材であり、底版型枠23を下方から支持する。下梁8は橋軸方向の前後に複数(本実施形態では2つ)設けられ、それぞれワーゲン1の前後の上梁11の両端部から吊材141により吊り支持される。また底版型枠23の前後の高さを、前後の下梁8のそれぞれに設けたジャッキ(不図示)等により調整可能である。 The lower beam 8 is a horizontal beam member extending in the direction perpendicular to the bridge axis, and supports the bottom slab formwork 23 from below. A plurality of lower beams 8 (two in this embodiment) are provided in front and rear of the bridge axis direction, and are suspended and supported by hanging members 141 from both ends of upper beams 11 in front and rear of the vehicle 1, respectively. Also, the front and rear heights of the bottom slab formwork 23 can be adjusted by jacks (not shown) provided on the front and rear lower beams 8, respectively.

鉄筋架台9は鉄筋30の先組に用いられる架台であり、作業床7上の鉄筋先組エリアで足場71内に配置される。鉄筋架台9は、フレーム10の上辺の延長部分10aの前後から吊材142によって吊り支持される。 The reinforcing bar frame 9 is a frame used for pre-assembling the reinforcing bars 30 and is arranged in the scaffolding 71 in the reinforcing bar pre-assembling area on the working floor 7 . The reinforcing bar frame 9 is suspended and supported by hanging members 142 from the front and rear of the extended portion 10 a of the upper side of the frame 10 .

鉄筋架台9上では、箱桁4の断面内に埋設する鉄筋30が組み上げられる。鉄筋30は、ワーゲン1に設けたテルハ16によって橋軸方向に移動可能である。 On the reinforcing bar frame 9, reinforcing bars 30 to be embedded in the cross section of the box girder 4 are built up. The reinforcing bars 30 can be moved in the direction of the bridge axis by the Teruha 16 provided on the Wagen 1 .

テルハ16は、ワーゲン1の前後の上梁11に、橋軸方向に延びる左右一対のレール161を取付け、これらのレール161に沿って移動可能なホイスト162により鉄筋30を吊り支持するものである。なお鉄筋30は吊枠31を介して吊り支持される。 The Teruha 16 attaches a pair of left and right rails 161 extending in the direction of the bridge axis to the front and rear upper beams 11 of the Wagen 1, and suspends and supports the reinforcing bars 30 with a hoist 162 movable along these rails 161. Note that the reinforcing bars 30 are suspended and supported via suspension frames 31 .

図2に示すように、ウェブ41の内側では、橋軸方向に延びる水平方向のスライドレール17が配置される。スライドレール17はウェブ内型枠22と床版型枠24の前方への移動に用いる移動部である。スライドレール17の前部はワーゲン1の前部の上梁11から吊材(不図示)によって吊り支持され、スライドレール17の後部は床版43の上面から吊材143によって吊り支持される。吊材143は、ウェブ内型枠22、床版型枠24の後方で箱桁4の床版43を貫通するように配置される。なおワーゲン1の構成や配置等によってはスライドレール17の後部を前部と同様ワーゲン1から吊材143によって吊り支持することも可能である。 As shown in FIG. 2, inside the web 41, a horizontal slide rail 17 extending in the direction of the bridge axis is arranged. The slide rail 17 is a moving part used to move the inner web formwork 22 and floor slab formwork 24 forward. The front portion of the slide rail 17 is suspended from the front upper beam 11 of the vehicle 1 by suspension members (not shown), and the rear portion of the slide rail 17 is suspended from the upper surface of the floor slab 43 by suspension members 143 . The hanging member 143 is arranged so as to penetrate the floor slab 43 of the box girder 4 behind the inner web formwork 22 and the floor slab formwork 24 . It should be noted that depending on the configuration and arrangement of the vehicle 1, the rear portion of the slide rail 17 can be suspended and supported from the vehicle 1 by the suspending member 143, like the front portion.

さらに本実施形態では、ウェブ41の外側と内側に、橋軸方向に延びる水平方向の型枠受けビーム18、19が配置される。型枠受けビーム18、19は、それぞれウェブ外型枠21の腕部213と床版型枠24の支持部240を受けるためのものである。 Furthermore, in this embodiment horizontal formwork receiving beams 18 , 19 extending in the direction of the bridge axis are arranged on the outside and inside of the web 41 . The formwork receiving beams 18 and 19 are for receiving the arm part 213 of the web outer formwork 21 and the support part 240 of the floor slab formwork 24, respectively.

型枠受けビーム18、19の前部は、ワーゲン1の前部の上梁11からそれぞれ吊材(不図示)によって吊り支持される。型枠受けビーム18、19の後部は、床版43の上面から吊材144、145によって吊り支持される。吊材144はウェブ外型枠21の後方で箱桁4の床版43を貫通するように配置され、吊材145はウェブ内型枠22、床版型枠24の後方で箱桁4の床版43を貫通するように配置される。前記と同様、ワーゲン1の構成や配置等によっては型枠受けビーム18、19の後部を前部と同様ワーゲン1から吊材144、145によって吊り支持することも可能である。 The front portions of the formwork receiving beams 18 and 19 are suspended from the upper beam 11 of the front portion of the wagon 1 by hanging members (not shown). The rear portions of the formwork receiving beams 18 and 19 are suspended and supported by suspension members 144 and 145 from the upper surface of the floor slab 43 . Hanging members 144 are arranged to penetrate the floor slab 43 of the box girder 4 behind the outer web formwork 21 , and hanging members 145 are arranged behind the inner web formwork 22 and the floor slab formwork 24 to the floor of the box girder 4 . It is arranged so as to penetrate the plate 43 . As described above, depending on the configuration and arrangement of the wagon 1, the rear portions of the formwork receiving beams 18 and 19 can be suspended from the wagon 1 by hanging members 144 and 145 in the same manner as the front portions.

(2.箱桁4の施工方法)
次に、図3~図9を参照して箱桁4の施工方法について説明する。本実施形態では、まず図1、2で説明した状態からウェブ外型枠21の脱型を行う。
(2. Construction method of box girder 4)
Next, a construction method of the box girder 4 will be described with reference to FIGS. 3 to 9. FIG. In this embodiment, first, the web outer formwork 21 is removed from the state described with reference to FIGS.

ここでは、ウェブ外型枠21の固定用のアンカー50と胴締め材28を取り外した後、ウェブ外型枠21の斜材214を収縮させて腕部213を下方に若干回転させ、また斜材2173を収縮して鉛直材212を若干外側に傾倒させる。これによりウェブ外型枠21の鉛直面内の形状を変形し、型枠パネル211と箱桁4のウェブ41および床版43の翼部との間に隙間を作り、図3に示すようにガイド218に沿ってウェブ外型枠21を外側へと移動させる。この時、型枠パネル211に取付けておいたインサート44はウェブ41内に残置される。 Here, after the anchors 50 for fixing the web outer formwork 21 and the body tightening material 28 are removed, the diagonal members 214 of the web outer formwork 21 are contracted to rotate the arms 213 slightly downward, and the diagonal members 2173 is contracted to tilt the vertical member 212 slightly outward. As a result, the shape of the web outer formwork 21 in the vertical plane is deformed to create a gap between the formwork panel 211 and the web 41 of the box girder 4 and the wing portion of the floor slab 43, thereby guiding the guide as shown in FIG. 218 to move the web outer formwork 21 outward. At this time, the inserts 44 attached to the form panel 211 remain in the web 41 .

底版型枠23についても前記した支持部230の高さ調整により脱型を行った後、図4に示すようにワーゲン1を前方に移動させる。 After removing the bottom slab formwork 23 by adjusting the height of the supporting portion 230 as described above, the wagen 1 is moved forward as shown in FIG.

この時、ワーゲン1から吊られた作業床7や下梁8、鉄筋架台9および鉄筋30はワーゲン1の移動と共に前方に移動する。作業床7から支持された水平床73上のウェブ外型枠21、および、下梁8から支持された底版型枠23もワーゲン1の移動と共に箱桁4の既設部分から前方に移動して箱桁4の構築予定箇所に配置される。 At this time, the work floor 7, the lower beam 8, the reinforcing bar frame 9 and the reinforcing bars 30 suspended from the wagon 1 move forward as the wagon 1 moves. The outer web formwork 21 on the horizontal floor 73 supported by the working floor 7 and the bottom slab formwork 23 supported by the lower beam 8 also move forward from the existing portion of the box girder 4 along with the movement of the wagegen 1 to form the box. It is placed at the planned construction location of Girder 4.

また、レール6やスライドレール17、型枠受けビーム18、19はワーゲン1の移動に応じて前方に盛り替えられ、スライドレール17、型枠受けビーム18、19の後部は新たに箱桁4の床版43に通した吊材により床版43の上面から吊り支持される。 The rails 6, slide rails 17, and formwork support beams 18 and 19 are rearranged forward in accordance with the movement of the wagon 1, and the rear part of the slide rail 17 and formwork support beams 18 and 19 are newly attached to the box girder 4. Suspended support is provided from the upper surface of the floor slab 43 by hanging members passed through the floor slab 43 .

これらの吊材の位置も、前記と同様、スライドレール17と型枠受けビーム19についてはウェブ内型枠22、床版型枠24の後方、型枠受けビーム18については(移動後の)ウェブ外型枠21の後方とする。なお、レール6を前方に盛り替える代わりに、レール6の前方に新たなレール6を取付けてレール6を前方に延長させてもよい。これはスライドレール17や型枠受けビーム18、19についても同様である。 The positions of these hangers are also the same as described above, regarding the slide rail 17 and the formwork support beam 19, the formwork 22 inside the web, behind the floor slab formwork 24, and for the formwork support beam 18, the web (after movement) It is the rear of the outer formwork 21 . Instead of rearranging the rail 6 forward, a new rail 6 may be attached forward of the rail 6 to extend the rail 6 forward. The same applies to the slide rails 17 and the formwork receiving beams 18 and 19 .

ワーゲン1の移動後、ウェブ外型枠21と底版型枠23を、構築予定の箱桁4のウェブ41の外面と底版42の下面にセットする。この際、ウェブ外型枠21については前記と逆の手順により橋軸直角方向の位置と鉛直面内の形状を調整し、型枠パネル211を構築予定の箱桁4のウェブ41の外面と床版43の翼部の下面に沿って配置する。型枠パネル211には新たなインサート44を予め上下複数段に取付けておく。底版型枠23については、型枠パネル231が構築予定の箱桁4の底版42の下面に沿って配置されるように、支持部230の前後の高さを調整する。 After the wagon 1 is moved, the outer web formwork 21 and the bottom slab formwork 23 are set on the outer surface of the web 41 and the bottom surface of the bottom slab 42 of the box girder 4 to be constructed. At this time, for the web outer formwork 21, the position in the direction perpendicular to the bridge axis and the shape in the vertical plane are adjusted by the reverse procedure, and the outer surface of the web 41 of the box girder 4 scheduled to construct the formwork panel 211 and the floor are adjusted. It is arranged along the lower surface of the wings of the plate 43 . New inserts 44 are previously attached to the formwork panel 211 in a plurality of upper and lower stages. As for the bottom slab formwork 23, the front and rear heights of the support parts 230 are adjusted so that the form panel 231 is arranged along the bottom surface of the bottom slab 42 of the box girder 4 to be constructed.

その後、図5に示すように、鉄筋先組エリアで事前に組み上げておいた鉄筋30をテルハ16によって箱桁4の構築予定箇所に引き寄せ、構築予定の箱桁4の断面に当たる位置に配置する。 After that, as shown in FIG. 5, the reinforcing bars 30 preliminarily assembled in the reinforcing bar assembling area are drawn to the scheduled construction site of the box girder 4 by the Telha 16, and placed at the position corresponding to the section of the box girder 4 scheduled to be constructed.

次に、本実施形態では、箱桁4の既設部分のウェブ41の内側について、図6に示すようにウェブ内型枠22と床版型枠24の脱型を行う。 Next, in this embodiment, the inside of the web 41 of the existing portion of the box girder 4 is stripped of the web inner formwork 22 and the floor slab formwork 24 as shown in FIG.

この際、型枠受けビーム19を下降させて図7に示すように床版型枠24を脱型した後、サポート材25、ウェブ内型枠22の固定用のアンカー50、型枠パネル26、27を撤去し、型枠受けビーム19をさらに下降させると、ウェブ内型枠22と床版型枠24がダウンしてウェブ内型枠22の腕部223がスライドレール17上に配置した受材171に載置される。その後、ウェブ内型枠22をレバーホイスト(不図示)等を用いて内側に移動させる。 At this time, after the formwork receiving beam 19 is lowered to remove the floor slab formwork 24 as shown in FIG. 27 is removed and the formwork receiving beam 19 is further lowered, the web inner formwork 22 and the floor slab formwork 24 are lowered, and the arms 223 of the web inner formwork 22 are placed on the slide rails 17. 171. After that, the web inner mold 22 is moved inward using a lever hoist (not shown) or the like.

この時、ウェブ内型枠22の腕部223は床版型枠24の支持部240をスライドレールとしてこれに沿って内側にスライドする。腕部223や支持部(スライドレール)240の構成は特に限定されず、例えば支持部240に腕部223のスライドのためローラー等を設けることも可能である。またウェブ内型枠22の移動にスピンドル等の伸縮機構を利用することも可能である。さらに、床版型枠24の脱型前にウェブ内型枠22を内側にスライドさせ、その後ウェブ内型枠22と床版型枠24のダウンを行ってもよい。 At this time, the arm portion 223 of the inner web formwork 22 slides inward along the support portion 240 of the floor slab formwork 24 as a slide rail. The configurations of the arm portion 223 and the support portion (slide rail) 240 are not particularly limited, and for example, it is possible to provide the support portion 240 with a roller or the like for sliding the arm portion 223 . It is also possible to use a telescopic mechanism such as a spindle to move the web inner formwork 22 . Furthermore, the inner web formwork 22 may be slid inward before the floor slab formwork 24 is removed from the mold, and then the inner web formwork 22 and the floor slab formwork 24 may be lowered.

次に、図8に示すように、ウェブ内型枠22と床版型枠24をスライドレール17によってスライドさせ、箱桁4の既設部分から前方に移動させて箱桁4の構築予定箇所に配置する。本実施形態では、前記の受材171(図7参照)をスライドレール17上で前方に移動させることで、ウェブ内型枠22と床版型枠24が共に前方に移動できるようにしている。 Next, as shown in FIG. 8, the web inner formwork 22 and the floor slab formwork 24 are slid by the slide rails 17, moved forward from the existing portion of the box girder 4, and arranged at the construction planned location of the box girder 4. do. In this embodiment, by moving the receiving member 171 (see FIG. 7) forward on the slide rail 17, both the web inner formwork 22 and the floor slab formwork 24 can be moved forward.

その後、ウェブ内型枠22と床版型枠24を、構築予定の箱桁4のウェブ41の内面と床版43の下面にセットする。この際、ウェブ内型枠22と床版型枠24の位置を前記と逆の手順により調整し、ウェブ内型枠22と床版型枠24の型枠パネル221、241を構築予定の箱桁4のウェブ41の内面と床版43の下面に沿って配置する。型枠パネル221には新たなインサート44を予め上下複数段に取付けておく。 After that, the inner web formwork 22 and the floor slab formwork 24 are set on the inner surface of the web 41 and the lower surface of the floor slab 43 of the box girder 4 to be constructed. At this time, the positions of the web inner formwork 22 and the floor slab formwork 24 are adjusted in the reverse order of the above, and the formwork panels 221 and 241 of the web inner formwork 22 and the floor slab formwork 24 are to be constructed. 4 along the inner surface of the web 41 and the lower surface of the floor slab 43 . New inserts 44 are previously attached to the form panel 221 in a plurality of upper and lower stages.

また、ウェブ内型枠22間のサポート材25、ウェブ41と底版42の隅角部の型枠パネル26、ウェブ41の内側と床版43の隅角部の型枠パネル27を図2に示すように配置し、両ウェブ外型枠21の前端部同士を胴締め材28で繋ぐ。型枠パネル26、27については、箱桁4の構築予定断面に応じたものが用いられ、型枠パネル26、27を着脱可能且つ異なる形状のものに組替可能な分割構造とすることで、箱桁4の構築予定断面に応じた型枠の設置が容易になる。 FIG. 2 also shows the support material 25 between the web inner formwork 22, the formwork panel 26 at the corner between the web 41 and the bottom slab 42, and the formwork panel 27 at the corner between the inside of the web 41 and the floor slab 43. , and the front ends of both web outer forms 21 are connected with a body tightening material 28. - 特許庁The formwork panels 26 and 27 are used in accordance with the planned construction cross section of the box girder 4. By making the formwork panels 26 and 27 detachable and rearrangeable into different shapes, Formwork can be easily installed in accordance with the cross section to be constructed of the box girder 4. - 特許庁

その後、箱桁4の構築予定箇所でコンクリートを打設することで箱桁4の既設部分の前方に続けて箱桁4が構築される。なお、コンクリートの固化後には図示しないPC鋼材によるプレストレスの導入なども実施される。 After that, by placing concrete at the planned construction location of the box girder 4, the box girder 4 is constructed in front of the existing portion of the box girder 4. - 特許庁In addition, after the concrete is solidified, prestress is introduced by PC steel (not shown).

箱桁4の構築予定箇所では、コンクリートが下から順に打設される。図9は前記した型枠パネル211、221のインサート44のうち最下段のものがコンクリートCに埋設された状態を示しており、コンクリートCが固化すると、当該インサート44にアンカー50の先端をねじ込み、アンカー50によってウェブ外型枠21、ウェブ内型枠22をコンクリートC側に押さえつけて型枠パネル211、221を固定する。これにより、上方でコンクリートCを打設する際の打設圧に型枠パネル211、221を抵抗させる。コンクリートCの打設の進捗に応じて上方のインサート44へも順次上記と同様にアンカー50の先端をねじ込んでゆき、これらのアンカー50によって型枠パネル211、221の固定を行う。 Concrete is placed in order from the bottom at the construction planned location of the box girder 4 . FIG. 9 shows a state in which the lowest inserts 44 of the formwork panels 211 and 221 are embedded in the concrete C. When the concrete C hardens, the tips of the anchors 50 are screwed into the inserts 44, The formwork panels 211 and 221 are fixed by pressing the web outer formwork 21 and the web inner formwork 22 against the concrete C side by the anchors 50 . As a result, the formwork panels 211 and 221 resist the placing pressure when the concrete C is placed above. As the concrete C is poured, the tips of the anchors 50 are sequentially screwed into the upper inserts 44 in the same manner as described above, and the formwork panels 211 and 221 are fixed by these anchors 50 .

以上説明したように、本実施形態では、鉄筋先組工法と、予め組立てられセットされる箱桁構築用の型枠2を含む施工システム100の組合せにより、工期短縮が可能な実用性のある手法を実現できる。特に、ウェブ外型枠21、ウェブ内型枠22等を箱桁4の既設部分から構築予定箇所に移動させることで、型枠セットに係る時間を省略でき、またウェブ外型枠21、ウェブ内型枠22をアンカー50により箱桁4の打設後のコンクリートに固定することで、ウェブ外型枠21、ウェブ内型枠22の間のセパレータを無くすことが可能になり、セパレータの配置に手間が掛かったり、品質低下を招いたりすることがない。 As described above, in the present embodiment, a practical method capable of shortening the construction period is achieved by combining the reinforcement pre-construction method and the construction system 100 including the pre-assembled formwork 2 for box girder construction. can be realized. In particular, by moving the web outer formwork 21, the web inner formwork 22, etc. from the existing portion of the box girder 4 to the planned construction location, the time required for setting the formwork can be saved, and the web outer formwork 21, the web inner formwork 21, and the like can be saved. By fixing the formwork 22 to the concrete after the box girder 4 has been cast by the anchors 50, it becomes possible to eliminate the separator between the web outer formwork 21 and the web inner formwork 22, and the arrangement of the separator is troublesome. It does not cause any deterioration in quality.

また、本施工システム100では、ウェブ外型枠21、ウェブ内型枠22を橋軸直角方向に移動可能としたシステム化を行うことにより、型枠のセットと脱型が容易になり、工期短縮が可能になる。またウェブ厚が変化したり箱桁4の内空にPC鋼材の定着突起などの断面変化が有る場合でも、ウェブ外型枠21、ウェブ内型枠22の橋軸直角方向のスライドによって施工が容易になり、型枠の組み替えなども最小限とできる。 In addition, in this construction system 100, the web outer formwork 21 and the web inner formwork 22 are systematized so that they can be moved in the direction perpendicular to the bridge axis. becomes possible. In addition, even if the web thickness changes or there is a cross-sectional change such as a fixed protrusion of PC steel in the inner space of the box girder 4, construction is easy by sliding the web outer formwork 21 and web inner formwork 22 in the direction perpendicular to the bridge axis. It becomes possible to minimize the rearrangement of the formwork.

また本実施形態では、ウェブ外型枠21が脱型時に前記のように鉛直面内で変形することで、ウェブ外型枠21の脱型を容易に行うことができる。 Further, in this embodiment, the web outer formwork 21 is deformed in the vertical plane as described above during demolding, so that the web outer formwork 21 can be easily demolded.

また本実施形態では、ウェブ外型枠21をワーゲン1と共に移動させて先行設置し、ウェブ内型枠22については、ワーゲン1から吊り支持した鉄筋30の引き寄せ後にワーゲン1とは独立して後から移動させることにより、鉄筋30の配置が容易になり人力で鉄筋30を配置する必要が無くなる。 Further, in the present embodiment, the web outer formwork 21 is moved together with the wagegen 1 and installed in advance, and the web inner formwork 22 is installed independently of the wagegen 1 after the reinforcing bars 30 suspended and supported from the wagegen 1 are drawn. By moving, the arrangement of the reinforcing bars 30 becomes easier, and the necessity of manually arranging the reinforcing bars 30 is eliminated.

しかしながら、本発明は上記の実施形態に限らない。例えば本実施形態ではアンカー50の固定用に型枠パネル211、221にインサート44を取付けているが、このインサート44に曲げアンカーを設け、コンクリートへの定着性を高めることも可能である。 However, the invention is not limited to the above embodiments. For example, in the present embodiment, the inserts 44 are attached to the formwork panels 211 and 221 for fixing the anchors 50, but it is also possible to provide bending anchors to the inserts 44 to improve fixability to concrete.

また本実施形態では鉄筋30を箱桁4の構築予定箇所に引き寄せた後、ウェブ内型枠22と床版型枠24を前方に引き出して箱桁4の構築予定箇所に配置しているが、図10に示すように鉄筋30の引き寄せ前に床版型枠24を前方に引き出して箱桁4の構築予定箇所に配置し、鉄筋30を箱桁4の構築予定箇所に引き寄せた後、ウェブ内型枠22の引き出しを行ってもよい。どちらの方法を用いるかは、施工条件その他によって定めることができる。 Further, in this embodiment, after the reinforcing bars 30 are drawn to the planned construction location of the box girder 4, the inner web formwork 22 and the floor slab formwork 24 are pulled forward and arranged at the planned construction location of the box girder 4. As shown in FIG. 10, the floor slab formwork 24 is pulled forward before the reinforcing bars 30 are pulled up and arranged at the scheduled construction location of the box girder 4. After the reinforcing bars 30 are pulled up to the scheduled construction location of the box girder 4, The formwork 22 may be drawn out. Which method to use can be determined according to construction conditions and other factors.

鉄筋30の引き寄せ前に床版型枠24の引き出しを行う場合、例えば床版型枠24は型枠受けビーム19に沿ってウェブ内型枠22とは独立に移動できるようにしておく。床版型枠24の移動にウェブ内型枠22の腕部223が干渉しないよう、腕部223およびスライドレール17は前記の図7よりも低い位置としておき、ウェブ内型枠22は、腕部223を前記の受材171上に載せた状態でスライドレール17に沿って前方に別途移動させる。 When the floor slab formwork 24 is pulled out before the reinforcing bars 30 are drawn, for example, the floor slab formwork 24 is made movable along the formwork receiving beam 19 independently of the web inner formwork 22 . The arms 223 and the slide rails 17 are positioned lower than in FIG. 223 is separately moved forward along the slide rail 17 while being placed on the receiving member 171 .

また、本実施形態では図6に示すようなウェブ内型枠22と床版型枠24の脱型をワーゲン1の移動後に行っているが、ワーゲン1の移動前にウェブ内型枠22と床版型枠24の脱型を行ってもよい。 In this embodiment, the web inner formwork 22 and floor slab formwork 24 as shown in FIG. The plate formwork 24 may be demolded.

以上、添付図面を参照して、本発明の好適な実施形態について説明したが、本発明は係る例に限定されない。当業者であれば、本願で開示した技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical ideas disclosed in the present application, and these also belong to the technical scope of the present invention. Understood.

1:ワーゲン
2:型枠
4:箱桁
5:橋脚
6:レール
7:作業床
8:下梁
9:鉄筋架台
10:フレーム
11:上梁
16:テルハ
17:スライドレール
18、19:型枠受けビーム
21:ウェブ外型枠
22:ウェブ内型枠
23:底版型枠
24:床版型枠
25:サポート材
26、27、211、221、231、241:型枠パネル
28:胴締め材
30:鉄筋
41:ウェブ
42:底版
43:床版
44:インサート
50:アンカー
100:施工システム
1: Wagen 2: Formwork 4: Box girder 5: Bridge pier 6: Rail 7: Work floor 8: Lower beam 9: Reinforcement frame 10: Frame 11: Upper beam 16: Teruha 17: Slide rail 18, 19: Formwork receiver Beam 21: Web outer formwork 22: Web inner formwork 23: Bottom slab formwork 24: Floor slab formwork 25: Support members 26, 27, 211, 221, 231, 241: Form panel 28: Torso tightening member 30: Rebar 41: Web 42: Bottom slab 43: Floor slab 44: Insert 50: Anchor 100: Construction system

Claims (7)

橋梁の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁のウェブの内面にセットされるウェブ内型枠とを含む施工システムを用い、箱桁の既設部分の前方に続けて箱桁を構築する箱桁の施工方法であって、
箱桁の構築予定箇所の前方で組まれた鉄筋を箱桁の構築予定箇所に引き寄せて構築予定の箱桁の断面に当たる位置に配置する工程(a)と、
前記ウェブ外型枠と前記ウェブ内型枠が箱桁の構築予定箇所に配置された状態で、箱桁の構築予定箇所にコンクリートを打設することで、箱桁の既設部分の前方に続けて箱桁を構築する工程(b)と、
を有し、
前記ウェブ外型枠と前記ウェブ内型枠は、箱桁の既設部分から前方に移動させて箱桁の構築予定箇所に配置され、コンクリートの打設時に、打設されたコンクリートにアンカーによって固定することを特徴とする箱桁の施工方法。
Using a construction system that includes an outer web formwork set on the outer surface of the web of the box girder of the bridge and an inner web formwork set on the inner surface of the box girder web, continuing in front of the existing part of the box girder. A box girder construction method for constructing a box girder, comprising:
A step (a) of drawing the reinforcing bars assembled in front of the planned construction location of the box girder to the planned construction location of the box girder and arranging them at a position corresponding to the cross section of the planned construction box girder;
In a state in which the outer web formwork and the inner web formwork are arranged at the planned construction location of the box girder, concrete is placed at the planned construction location of the box girder, so that the existing portion of the box girder is continued forward. step (b) of constructing a box girder;
has
The outer web formwork and the inner web formwork are moved forward from the existing portion of the box girder to be arranged at the scheduled construction site of the box girder, and are fixed to the placed concrete by anchors when the concrete is poured . A box girder construction method characterized by:
橋梁の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁のウェブの内面にセットされるウェブ内型枠とを含む施工システムを用い、箱桁の既設部分の前方に続けて箱桁を構築する箱桁の施工方法であって、
箱桁の構築予定箇所の前方で組まれた鉄筋を箱桁の構築予定箇所に引き寄せて構築予定の箱桁の断面に当たる位置に配置する工程(a)と、
前記ウェブ外型枠と前記ウェブ内型枠が箱桁の構築予定箇所に配置された状態で、箱桁の構築予定箇所にコンクリートを打設することで、箱桁の既設部分の前方に続けて箱桁を構築する工程(b)と、
を有し、
前記ウェブ外型枠と前記ウェブ内型枠は、橋軸直角方向に移動可能であることを特徴とする箱桁の施工方法。
Using a construction system that includes an outer web formwork set on the outer surface of the web of the box girder of the bridge and an inner web formwork set on the inner surface of the box girder web, continuing in front of the existing part of the box girder. A box girder construction method for constructing a box girder, comprising:
A step (a) of drawing the reinforcing bars assembled in front of the planned construction location of the box girder to the planned construction location of the box girder and arranging them at a position corresponding to the cross section of the planned construction box girder;
In a state in which the outer web formwork and the inner web formwork are arranged at the planned construction location of the box girder, concrete is placed at the planned construction location of the box girder, so that the existing portion of the box girder is continued forward. step (b) of constructing a box girder;
has
A box girder construction method , wherein the web outer formwork and the web inner formwork are movable in a direction perpendicular to the bridge axis .
橋梁の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁のウェブの内面にセットされるウェブ内型枠とを含む施工システムを用い、箱桁の既設部分の前方に続けて箱桁を構築する箱桁の施工方法であって、
箱桁の構築予定箇所の前方で組まれた鉄筋を箱桁の構築予定箇所に引き寄せて構築予定の箱桁の断面に当たる位置に配置する工程(a)と、
前記ウェブ外型枠と前記ウェブ内型枠が箱桁の構築予定箇所に配置された状態で、箱桁の構築予定箇所にコンクリートを打設することで、箱桁の既設部分の前方に続けて箱桁を構築する工程(b)と、
を有し、
前記ウェブ外型枠は、鉛直面内で変形可能であることを特徴とする箱桁の施工方法。
Using a construction system that includes an outer web formwork set on the outer surface of the web of the box girder of the bridge and an inner web formwork set on the inner surface of the box girder web, continuing in front of the existing part of the box girder. A box girder construction method for constructing a box girder, comprising:
A step (a) of drawing the reinforcing bars assembled in front of the planned construction location of the box girder to the planned construction location of the box girder and arranging them at a position corresponding to the cross section of the planned construction box girder;
In a state in which the outer web formwork and the inner web formwork are arranged at the planned construction location of the box girder, concrete is placed at the planned construction location of the box girder, so that the existing portion of the box girder is continued forward. step (b) of constructing a box girder;
has
A construction method for a box girder, wherein the web outer formwork is deformable in a vertical plane .
橋梁の箱桁のウェブの外面にセットされるウェブ外型枠と、箱桁のウェブの内面にセットされるウェブ内型枠とを含む施工システムを用い、箱桁の既設部分の前方に続けて箱桁を構築する箱桁の施工方法であって、
箱桁の構築予定箇所の前方で組まれた鉄筋を箱桁の構築予定箇所に引き寄せて構築予定の箱桁の断面に当たる位置に配置する工程(a)と、
前記ウェブ外型枠と前記ウェブ内型枠が箱桁の構築予定箇所に配置された状態で、箱桁の構築予定箇所にコンクリートを打設することで、箱桁の既設部分の前方に続けて箱桁を構築する工程(b)と、
を有し、
前記施工システムは、
箱桁の既設部分の上に配置され、箱桁の施工の進捗に応じて前方に移動するワーゲンと、
前記ウェブ内型枠を、前記ワーゲンの移動とは別に、箱桁の既設部分から前方に移動させる移動部と、
を有し、
前記鉄筋は、橋軸方向に移動可能に前記ワーゲンから吊り支持され、
前記ウェブ外型枠は、前記工程(a)の前に、前記ワーゲンの移動と共に箱桁の既設部分から前方に移動して箱桁の構築予定箇所に配置され、
前記ウェブ内型枠は、前記工程(a)の後且つ前記工程(b)の前に、前記移動部により箱桁の既設部分から前方に移動して箱桁の構築予定箇所に配置されることを特徴とする箱桁の施工方法。
Using a construction system that includes an outer web formwork set on the outer surface of the web of the box girder of the bridge and an inner web formwork set on the inner surface of the box girder web, continuing in front of the existing part of the box girder. A box girder construction method for constructing a box girder, comprising:
A step (a) of drawing the reinforcing bars assembled in front of the planned construction location of the box girder to the planned construction location of the box girder and arranging them at a position corresponding to the cross section of the planned construction box girder;
In a state in which the outer web formwork and the inner web formwork are arranged at the planned construction location of the box girder, concrete is placed at the planned construction location of the box girder, so that the existing portion of the box girder is continued forward. step (b) of constructing a box girder;
has
The construction system includes:
A wagon that is placed on top of the existing box girder and moves forward according to the progress of the construction of the box girder;
a moving unit that moves the inner web formwork forward from the existing portion of the box girder separately from the movement of the wagen;
has
The reinforcing bars are suspended and supported from the wagon so as to be movable in the bridge axis direction,
Prior to the step (a), the web outer formwork is moved forward from the existing portion of the box girder along with the movement of the wagen and placed at the planned construction location of the box girder,
After the step (a) and before the step (b), the inner web formwork is moved forward from the existing portion of the box girder by the moving unit and placed at the planned construction location of the box girder. A box girder construction method characterized by:
前記施工システムは、箱桁の床版の下面に配置される床版型枠を有し、
前記床版型枠は、前記ウェブ内型枠と共に箱桁の既設部分から前方に移動して箱桁の構築予定箇所に配置されることを特徴とする請求項記載の箱桁の施工方法。
The construction system has a floor slab formwork arranged on the lower surface of the floor slab of the box girder,
5. The method of constructing a box girder according to claim 4 , wherein the floor slab formwork is moved forward from the existing portion of the box girder together with the inner web formwork, and is arranged at a location where the box girder is to be constructed.
前記施工システムは、箱桁の床版の下面に配置される床版型枠を有し、
前記床版型枠は、前記工程(a)の前に、箱桁の既設部分から前方に移動して箱桁の構築予定箇所に配置されることを特徴とする請求項記載の箱桁の施工方法。
The construction system has a floor slab formwork arranged on the lower surface of the floor slab of the box girder,
5. The box girder according to claim 4 , wherein the floor slab formwork is moved forward from the existing portion of the box girder and placed at a location where the box girder is planned to be constructed before the step (a). Construction method.
橋梁の箱桁の既設部分の前方に続けて箱桁を構築する際に用いる施工システムであって、
箱桁の既設部分から前方に移動し、構築予定の箱桁のウェブの外面にセットされるウェブ外型枠と、
箱桁の既設部分から前方に移動し、構築予定の箱桁のウェブの内面にセットされるウェブ内型枠と、
前記ウェブ外型枠と前記ウェブ内型枠を箱桁の構築予定箇所に打設されたコンクリートに固定するアンカーと、
を含むことを特徴とする施工システム。
A construction system for constructing a box girder in front of an existing box girder of a bridge, comprising:
an outer web formwork that moves forward from the existing portion of the box girder and is set on the outer surface of the web of the box girder to be constructed;
an inner-web formwork that moves forward from the existing portion of the box girder and is set on the inner surface of the web of the box girder to be constructed;
Anchors for fixing the outer web formwork and the inner web formwork to the concrete placed at the planned construction site of the box girder;
A construction system comprising:
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