JP4849371B2 - Construction method of upper part of pier in cantilever erection method - Google Patents

Construction method of upper part of pier in cantilever erection method Download PDF

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JP4849371B2
JP4849371B2 JP2007045304A JP2007045304A JP4849371B2 JP 4849371 B2 JP4849371 B2 JP 4849371B2 JP 2007045304 A JP2007045304 A JP 2007045304A JP 2007045304 A JP2007045304 A JP 2007045304A JP 4849371 B2 JP4849371 B2 JP 4849371B2
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bracket support
pier
leg
leg head
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JP2008208594A (en
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茂樹 山下
豊 加藤
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株式会社ピーエス三菱
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Description

本発明は、主として橋梁の片持架設工法、即ち、橋脚上端上に形成した柱頭部側面より片持梁を所定長さずつ延長させる方式の橋梁架設工法において、先に施工されている橋脚本体の上端部外周にブラケット支保工に型枠を支持させて脚頭部及び柱頭部又は柱頭部を形成する片持架設工法における橋脚上部の施工方法に関する。   The present invention mainly relates to a cantilever erection method for a bridge, that is, a bridge erection method in which a cantilever is extended by a predetermined length from a side surface of a column head formed on the upper end of a pier. It is related with the construction method of the upper part of the pier in the cantilever construction method which forms a leg head part and a column head, or a column head by making a bracket support work on a bracket support work on the upper end part outer periphery.

従来、橋梁を構築するための片持架設工法において、先に施工されている橋脚本体上の脚頭部及びその上に形成される柱頭部の施工は、次の順序で行われている（例えば特許文献１）。図１２に示すように、脚頭部の無い橋脚本体１が形成された後、その橋脚本体１の周囲に枠組み足場２を地上より立ち上げ、これを橋脚本体１に固定する。この枠組み足場２を利用して脚頭部用の型枠３を組み、コンクリートを打設して橋脚本体１の上端部を延長させる形状に脚頭部３を形成する。しかる後図１３に示すように、枠組み足場２の一部を解体し、脚頭部用ブラケット支保工４を組み立て、このブラケット支保工４に支持させて型枠を組み、片持梁の基端部構成する柱頭部５を脚頭部３の上端に一体に形成する。   Conventionally, in the cantilever erection method for constructing a bridge, the construction of the leg head on the pier main body and the column head formed thereon are performed in the following order (for example, Patent Document 1). As shown in FIG. 12, after the pier main body 1 without a leg head is formed, a frame scaffold 2 is raised from the ground around the pier main body 1 and fixed to the pier main body 1. A frame 3 for the leg head is assembled using the framework scaffold 2, and the leg head 3 is formed into a shape in which concrete is placed and the upper end of the pier body 1 is extended. Thereafter, as shown in FIG. 13, a part of the framework scaffold 2 is disassembled, a leg support bracket support 4 is assembled, a frame is assembled with the bracket support 4 and the base end of the cantilever beam. The column head 5 constituting a part is formed integrally with the upper end of the leg head 3.

このようにして柱頭部５を形成した後、図１４に示すように柱頭部５上に移動作業車（ワーゲン）６を搭載し、このワーゲン６から吊り足場７を吊り下げ、片持梁式の橋桁８を一定長さずつ延長させる。脚頭部用ブラケット支保工４は、不要となった後に適宜時期に解体して地上に吊り降ろす。
特開平６−２３５２０８号公報 After the pillar head 5 is formed in this way, a mobile work vehicle (wagen) 6 is mounted on the pillar head 5 as shown in FIG. Extend the bridge girder 8 by a certain length. The leg head bracket support 4 is disassembled at an appropriate time after being no longer needed and is suspended on the ground.
JP-A-6-235208

上述した従来の柱頭部施工方法では、地上から枠組み足場を積み上げるものであるため、特に橋脚の長さが長い場合には、枠組み足場の組み立て及び解体作業に多くの労力と時間を擁するため、工費が嵩むとともに工期が長くなるという問題があった。   In the above-mentioned conventional column head construction method, the framework scaffolding is piled up from the ground, and particularly when the length of the pier is long, it takes a lot of labor and time to assemble and dismantle the framework scaffolding. There is a problem that the construction period becomes longer as the process time increases.

本発明はこのような従来の問題に鑑み、片持架設工法における脚上部の施工に際し、枠組み足場を使用することなく、少ない工数で短期間に施工できる橋脚上部の施工方法の提供を目的としてなされたものである。   In view of such conventional problems, the present invention has been made for the purpose of providing a construction method for an upper part of a pier that can be constructed in a short period of time with a small number of man-hours without using a framework scaffold when constructing an upper part of a cantilever construction method. It is a thing.

上述の如き従来の問題を解決し、所期の目的を達成するための請求項１に記載の発明の特徴は、先に構築されている橋脚本体の上端に、橋桁を構成する柱頭部を支持させるための脚頭部を形成し、該脚頭部上に前記柱頭部を構築し、該柱頭部より片持式にて橋桁を張出し施工する片持架設工法における橋脚上部の施工方法において、前記脚頭部を形成するための脚頭部用ブラケット支保工を前記橋脚本体の周囲の地上において組み立てるとともに、前記橋脚本体部の上端に吊り操作手段を支持させ、該吊り操作手段をもって地上にて組み立てられた前記脚頭部用ブラケット支保工を所望の位置まで吊り上げ、該ブラケット支保工を橋脚本体部の上端部外周に固定し、その固定されたブラケット支保工上に支持させて脚頭部成形用の型枠を組んで前記脚頭部を形成し、該脚頭部を構築した後、前記柱頭部を形成するための柱頭部用ブラケット支保工を、前記脚頭部の外周に支持させて設置することにある。 The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving the intended purpose is that a pillar head constituting a bridge girder is supported at the upper end of a previously constructed pier body. In the construction method of the upper part of the pier in the cantilever erection method in which the pillar head is formed on the leg head, the pillar head is constructed on the leg head, and the bridge girder is extended from the pillar head in a cantilever manner Assemble the bracket support for the leg head to form the leg head on the ground around the pier body, and support the suspension operation means on the upper end of the pier body, and assemble on the ground with the suspension operation means The above-mentioned bracket support for the leg head is lifted to a desired position, the bracket support is fixed to the outer periphery of the upper end of the pier body, and is supported on the fixed bracket support for the leg head molding. Assembling the formwork Wherein forming the legs head, after building the leg head bracket 支保 Engineering for capital portion for forming the capital portion is to placed is supported on the outer circumference of the leg head.

請求項２に記載の発明の特徴は、前記請求項１の構成に加え、前記脚頭部用ブラケット支保工の地上における組み立ては、全体を複数に分割した形状の複数の部分ブラケット支保工に形成し、その部分ブラケット支保工毎に前記橋脚本体の上端部外周の所定の位置まで吊り上げてそれぞれを橋脚本体に固定することにある。   The feature of the invention described in claim 2 is that, in addition to the configuration of claim 1, the assembly of the leg head bracket support on the ground is formed into a plurality of partial bracket support works having a shape divided into a plurality of parts. Then, each partial bracket support is to be lifted up to a predetermined position on the outer periphery of the upper end of the pier body and fixed to the pier body.

請求項３に記載の発明の特徴は、前記請求項１の構成に加え、前記脚頭部用ブラケット支保工の地上における組み立ては、橋脚本体全体の全周を囲む形状に全体を一体化させ、これを前記橋脚本体の上端部外周の所定の位置まで吊り上げて固定することにある。   The feature of the invention according to claim 3 is that, in addition to the configuration of claim 1, the assembly of the bracket support for the leg head on the ground is integrated into a shape surrounding the entire circumference of the pier body, This is to lift and fix it to a predetermined position on the outer periphery of the upper end of the pier body.

請求項４に記載の発明の特徴は、前記請求項１，２又は３のいずれか１の請求項の構成に加え、前記脚頭部を構築した後、前記脚頭部成形用の型枠を解体し、前記脚頭部用ブラケット支保工を吊り操作手段により脚頭部の上端部外周まで引き上げて該脚頭部外周に固定し、これを柱頭部を形成するための柱頭部用ブラケット支保工として使用することにある。   According to a fourth aspect of the present invention, in addition to the structure of any one of the first, second, and third aspects, after the leg head is constructed, the mold for molding the leg head is provided. Dismantling and lifting the bracket support for the leg head to the outer periphery of the upper end of the leg head by means of the suspension operation means, and fixing it to the outer periphery of the leg head, and forming the column head bracket support for this There is to use as.

本発明においては、請求項１に記載の如く、脚頭部を形成するための脚頭部用ブラケット支保工を前記橋脚本体の周囲の地上において組み立てるとともに、前記橋脚本体部の上端に吊り操作手段を支持させ、該吊り操作手段をもって地上にて組み立てられた前記脚頭部用ブラケット支保工を所望の位置まで吊り上げ、該ブラケット支保工を橋脚本体部の上端部外周に固定し、その固定されたブラケット支保工上に支持させて脚頭部成形用の型枠を組んで前記脚頭部を形成し、該脚頭部を構築した後、前記柱頭部を形成するための柱頭部用ブラケット支保工を、前記脚頭部の外周に支持させて設置することとしたことにより、従来のように、橋脚本体の上端部のブラケット支保工固定位置の高さまで枠組み足場を組み立てる必要が無くなり、その分だけ作業工数が削減されることとなり、コストが削減されるとともに工期も短縮される。   In the present invention, as described in claim 1, a bracket support for a leg head for forming a leg head is assembled on the ground around the pier main body, and a suspension operation means is suspended from the upper end of the pier main body. The bracket support for the leg head assembled on the ground with the suspension operation means is lifted to a desired position, and the bracket support is fixed to the outer periphery of the upper end of the pier body, and the fixed A column head bracket support for forming the column head after the leg head is formed by assembling a mold for forming the leg head by supporting it on the bracket support and forming the leg head Is supported on the outer periphery of the leg head, so that it is no longer necessary to assemble the frame scaffolding to the height of the bracket support fixing position at the upper end of the pier body as in the prior art. Will be divided only work man-hours are reduced, the construction period is shortened along with the cost is reduced.

請求項２の如く、前記脚頭部用ブラケット支保工の地上における組み立ては、全体を複数に分割した形状の複数の部分ブラケット支保工に形成し、その部分ブラケット支保工毎に前記橋脚本体の上端部外周の所定の位置まで吊り上げてそれぞれを橋脚本体に固定することにより、地上にて組み立てられたブラケット支保工の吊り上げ作業が容易となる。   According to claim 2, the assembly of the bracket support for the leg head on the ground is formed into a plurality of partial bracket support having a shape divided into a plurality of parts, and the upper end of the pier body is provided for each partial bracket support. Lifting up to a predetermined position on the outer periphery of the section and fixing each to the pier body facilitates the lifting work of the bracket support constructed on the ground.

請求項３の如く、前記脚頭部用ブラケット支保工の地上における組み立ては、橋脚本体全体の全周を囲む形状に全体を一体化させ、これを前記橋脚本体の上端部外周の所定の位置まで吊り上げて固定することにより、吊り上げ後の高所での連結作業を必要としないため、安全性が高く、吊り上げ作業に困難を伴わない比較的径の小さい橋脚に対して施工する場合において効果がある。   As in claim 3, the assembly of the bracket support for the leg head on the ground is integrated into a shape surrounding the entire circumference of the entire pier body, and this is integrated to a predetermined position on the outer periphery of the upper end of the pier body. By lifting and fixing, there is no need for connection work at a high place after lifting, so it is highly safe and effective for construction on a pier with a relatively small diameter that does not cause difficulty in lifting work. .

請求項４の如く、脚頭部を構築した後、前記脚頭部成形用の型枠を解体し、前記脚頭部用ブラケット支保工を吊り操作手段により脚頭部の上端部外周まで引き上げて該脚頭部外周に固定し、これを柱頭部を形成するための柱頭部用ブラケット支保工として使用する方法は、１つのブラケット支保工を脚頭部用と柱頭部用とに供用でき、経済性が高いものとなる。   After constructing the leg head as in claim 4, the mold for molding the leg head is disassembled, and the leg head bracket support is pulled up to the outer periphery of the upper end of the leg head by the suspension operation means. The method of fixing the outer periphery of the leg head and using it as a column head bracket support for forming the column head can use one bracket support for the leg head and the column head. It becomes a thing with high property.

次に本発明の実施の形態を図面に示した実施例に基づいて説明する。図１〜図１１は、本発明に係る柱頭部施工方法を、通常のＲＣ造（鉄筋コンクリート造）又はＰＣ造（プレストレストコンクリート造）の橋脚に実施した例を示しており、図１、図２は、先に施工されている橋脚本体の上端部に、本発明方法により脚頭部及び脚頭部を構築した状態を示しており、同図中符号１０は橋脚本体、１１は脚頭部、１２は脚頭部１１上に一体に形成した柱頭部を示している。柱頭部１２には、両側に一体に張り出された片持梁基端部１３，１３を一体に有している。   Next, embodiments of the present invention will be described based on examples shown in the drawings. 1-11 has shown the example which implemented the column head construction method based on this invention to the bridge pier of normal RC structure (reinforced concrete structure) or PC structure (prestressed concrete structure), and FIG. 1, FIG. 1 shows a state in which the leg head and the leg head are constructed by the method of the present invention at the upper end of the pier body that has been previously constructed. In the figure, reference numeral 10 denotes the pier body, 11 denotes the leg head, Indicates a pillar head formed integrally on the leg head 11. The column head 12 integrally has cantilever base end portions 13 and 13 that are integrally projected on both sides.

次に前記脚頭部１１及び柱頭部１２の施工方法について説明する。先ず、橋脚本体１０の上端に、吊り操作装置を支持させるための架設梁１５を設置する。この架設梁１５は、図３に示すように橋脚本体部１０の上端に後打アンカー等の適宜固定手段１６により基端部が固定されて橋脚本体１０の外周側に突設させ、その架設梁１５の下側に橋脚本体１０の外周面に沿った垂下片１７を固定し、該垂下片１７と架設梁１５の先端部下面との間に斜材１８を介在させて片持梁構造とする。これを橋脚本体１０の前後左右の面にそれぞれ１対ずつ設置する。   Next, a construction method of the leg head 11 and the column head 12 will be described. First, an erection beam 15 for supporting the suspension operation device is installed at the upper end of the pier body 10. As shown in FIG. 3, the erection beam 15 is fixed to the upper end of the pier main body 10 by an appropriate fixing means 16 such as a post-hit anchor, and is projected from the outer peripheral side of the pier main body 10. A hanging piece 17 along the outer peripheral surface of the pier main body 10 is fixed to the lower side of the pier 15, and an oblique member 18 is interposed between the hanging piece 17 and the lower surface of the distal end portion of the erected beam 15 to form a cantilever structure. . One pair is installed on each of the front, rear, left and right surfaces of the pier body 10.

この架設梁１５の先端部には吊り操作手段１９を吊り下げ指示させる。この吊り操作手段１９としては一例として吊りワイヤー２０を繰り出し及び巻き取りする電動のウインチを使用する他、吊りワイヤーを連続して引き上げ、繰り下ろしできる連続ジャッキ又はチェーンブロックを使用する。   The suspension operating means 19 is instructed to be suspended from the tip of the erection beam 15. As an example of the suspending operation means 19, an electric winch for feeding and winding the suspending wire 20 is used as an example, and a continuous jack or a chain block that can continuously pull up and pull the suspending wire is used.

一方、架設梁１５の設置と並行又は前後して、橋脚本体１０の周囲の地上において、脚頭部１１を形成するための脚頭部用ブラケット支保工３０を組み立てる。このブラケット支保工３０は、図４に示すように、橋脚本体１０の前後部及び左右部の４個の分割パーツ、即ち前後部分ブラケット支保工３１，３２、左右部分ブラケット支保工３３，３４に分割してそれぞれを別々に組み立てる。   On the other hand, in parallel with or before and after the installation of the bridge beam 15, the leg head bracket support 30 for assembling the leg head 11 is assembled on the ground around the pier body 10. As shown in FIG. 4, the bracket support 30 is divided into four divided parts, ie, front and rear portions and left and right portions of the pier body 10, that is, front and rear partial bracket supports 31 and 32 and left and right partial bracket supports 33 and 34. And assemble each separately.

各部分ブラケット支保工３１〜３４は、図３に示すように、水平配置のデッキ部３５と、そのデッキ部３５の橋脚本体側端部に立て向きに固定した縦材３６と、該縦材の下端側とデッキ部３５の先端側下面間に介在させた斜材３７とにより組み立てる。また、縦材３６の橋脚側にはローラー３８が出入調節ジャッキ３９を介して出入自在に設置する。   As shown in FIG. 3, each of the partial bracket support members 31 to 34 includes a horizontally disposed deck portion 35, a vertical member 36 fixed to the end of the deck portion 35 on the pier body side, and a vertical member 36 of the vertical member. Assembling is performed with the diagonal member 37 interposed between the lower end side and the lower surface on the front end side of the deck portion 35. Further, a roller 38 is installed on the pier side of the vertical member 36 so as to freely enter and exit through an entrance / exit adjustment jack 39.

このようにして各部分ブラケット支保工３１〜３４を組み立て、前述した各架設梁１５を設置した後、図５、図６に示すように、各架設梁１５の吊り操作手段１９により吊りワイヤー２０を介して各部分ブラケット支保工を吊り上げる。この吊り上げに際し、ローラー３８を橋脚本体１０の表面に接触させて転がす。これによって部分ブラケット支保工の吊り上げがスムーズかつ安全になされる。   After assembling each of the bracket support members 31 to 34 in this way and installing each of the above-mentioned erection beams 15, as shown in FIGS. 5 and 6, the suspension wire 20 is attached by the suspending operation means 19 of each erection beam 15. Lift each partial bracket support. When lifting, the roller 38 is brought into contact with the surface of the pier body 10 and rolled. As a result, the partial bracket support can be lifted smoothly and safely.

この部分ブラケット支保工３１〜３４を所望の高さまで吊り上げた後、ローラー３８を引っ込め、必要に応じてこれを取り外し、図８に示すように縦材３６を橋脚本体１０の表面に接触させ、それぞれを後打ちのアンカー３９によって固定するとともに、互いに隣り合う部分ブラケット支保工間を連結して全体が一体となったブラケット支保工３０として橋脚本体１０の上端部外周に固定する。   After lifting the partial bracket supports 31 to 34 to a desired height, the roller 38 is retracted, removed as necessary, and the vertical member 36 is brought into contact with the surface of the pier body 10 as shown in FIG. Are fixed by the post-fixed anchor 39, and are connected to the outer periphery of the upper end portion of the pier main body 10 as a bracket support work 30 which connects the adjacent bracket support works adjacent to each other.

尚、この例ではブラケット支保工３０を、地上にて４分割した状態に組み立てているが、分割することなく全体を、橋脚本体１０を取り囲むリング状に一体化させた形状に組み立て、これを前述と同様にして吊り操作手段１９によって吊り上げて、所定の位置にて橋脚本体に固定してもよい。   In this example, the bracket support 30 is assembled in a state of being divided into four on the ground, but the whole is assembled into a ring shape surrounding the pier body 10 without being divided, and this is described above. In the same manner as above, it may be lifted by the suspension operating means 19 and fixed to the pier body at a predetermined position.

次いで図７に示すように、ブラケット支保工３０上に枠組み足場４５を組み立て、脚頭部１１の橋脚本体１０の上端に延長させて場所打ち形成するための型枠４６を組み、その内部に必要な配筋を行いコンクリートを打設して脚頭部１１を形成する。   Next, as shown in FIG. 7, a frame scaffold 45 is assembled on the bracket support 30, and a formwork 46 is formed to extend to the upper end of the pier body 10 of the leg head 11 and to be cast in place. The leg head 11 is formed by placing concrete and placing concrete.

次に、図９に示すように、型枠４６及び枠組み足場４５の一部を解体し、柱頭部１２を形成するため柱頭部用ブラケット支保工５０を脚頭部１１の上端部外周に支持させて組み立てる。この柱頭部用ブラケット支保工５０は、上下方向に向けて脚頭部１１の外周に沿わせて固定した縦材５１と、この縦材に支持させて水平方向に向けたデッキ部５２と、デッキ部５２の先端部下面と縦材５１との間に介在させた斜材５３とから構成する。   Next, as shown in FIG. 9, part of the mold 46 and the framework scaffold 45 is disassembled, and the column head bracket support 50 is supported on the outer periphery of the upper end of the leg head 11 to form the column head 12. And assemble. The column head bracket support 50 includes a vertical member 51 fixed along the outer periphery of the leg head 11 in the vertical direction, a deck portion 52 supported in the vertical direction and directed in the horizontal direction, and a deck. It is composed of a diagonal member 53 interposed between the lower surface of the front end of the portion 52 and the vertical member 51.

尚、脚頭部用ブラケット支保工３０と柱頭部用ブラケット支保工５０との間隔が大きい場合には、図１０に示すように、脚頭部用ブラケット支保工３０の上方の脚頭部外周に簡易ブラケット５５を固定し、この簡易ブラケットを使用して柱頭部用ブラケット支保工５０組み立てるようにしても良い。   In addition, when the space | interval of the bracket support 30 for leg heads and the bracket support 50 for pillar heads is large, as shown in FIG. The simple bracket 55 may be fixed, and the column head bracket support 50 may be assembled using the simple bracket.

このようにして柱頭部用ブラケット支保工５０又は簡易ブラケット５５を使用する場合にはその簡易ブラケット５５を取り付けた後、脚頭部ブラケット３０の橋脚本体１０との固定を解き、吊り手段１９によって脚頭部用ブラケット支保工５５を前述した部分ブラケット支保工３１〜３４に分けて吊りおろす。   When the column head bracket support 50 or the simple bracket 55 is used in this way, after attaching the simple bracket 55, the leg head bracket 30 is unfixed from the pier body 10, and the suspension means 19 supports the leg. The head bracket supporting work 55 is divided into the above-described partial bracket supporting works 31 to 34 and suspended.

この柱頭部用ブラケット支保工５０の上に、図１０に示すように必要な支保工５６に支持させて柱頭部形成用の型枠５７を組み、場所打ちコンクリートを打設して柱頭部１２を形成する。   As shown in FIG. 10, a pillar head forming mold 57 is assembled on the pillar head bracket supporting work 50 as shown in FIG. Form.

尚、上述の例では脚頭部用ブラケット支保工３０とは別に柱頭部用ブラケット支保工５０を用いているが、脚頭部用ブラケット支保工を柱頭部用ブラケット支保工として使用する場合には、図１１（ａ）に示すように脚頭部１１の形成後、同図（ｂ）に示すように脚頭部用ブラケット支保工３０を脚頭部上端に支持させた吊り操作手段１９によって吊り、橋脚本体との固定を解いて吊り上げ、脚頭部上端部外周まで吊り上げて前述と同様にアンカーにより脚頭部１１に固定し、これを同図（ｃ）に示すように柱頭部用ブラケット支保工５０として使用して柱頭部１２を形成し、しかる後同図（ｄ）に示すように吊り操作手段１９によって吊り下ろすようにしてもよい。   In the above example, the column head bracket support 50 is used separately from the leg head bracket support 30, but when the leg head bracket support is used as the column head bracket support, After the leg head 11 is formed as shown in FIG. 11 (a), the leg head bracket support 30 is suspended by the suspension operating means 19 supported on the upper end of the leg head as shown in FIG. 11 (b). Unfasten the pier body and lift it, lift it up to the outer periphery of the upper end of the leg head, and fix it to the leg head 11 with the anchor in the same way as described above, and support it for the pillar head bracket as shown in FIG. The column head 12 may be formed by using as the work 50 and then suspended by the suspension operating means 19 as shown in FIG.

また、上述の実施例では、予め形成されている橋脚本体１０の上端に、橋桁を構成する柱頭部１２を支持させるための脚頭部１１を形成する場合について示しているが、橋脚の上端部に予め柱頭部１２を連結させるための脚頭部１１が形成されている場合には、図には示してないが、前述した脚頭部用ブラケット支保工３０と同様に、柱頭部用ブラケット支保工５０を地上で全体を一体化又は複数分割した状態に組み立て、図５、図６に示す脚頭部用ブラケット支保工３０と同様にして吊り上げ、予め形成されている脚頭部に固定する。しかる後、柱頭部用ブラケット支保工５０の上に、図１０に示すように必要な支保工５６に支持させて柱頭部形成用の型枠５７を組み、場所打ちコンクリートを打設して柱頭部１２を形成する。   Moreover, although the above-mentioned Example has shown about the case where the leg head 11 for supporting the column head 12 which comprises a bridge girder is formed in the upper end of the pier body 10 formed previously, the upper end part of a pier is shown. In the case where the leg head 11 for previously connecting the column head 12 is formed, the bracket support for the column head is supported in the same manner as the bracket support 30 for the leg head described above. The work 50 is assembled on the ground so as to be integrated or divided into a plurality of parts, and is lifted in the same manner as the leg head bracket support 30 shown in FIGS. 5 and 6 and fixed to a pre-formed leg head. After that, on the pillar head bracket supporting work 50, as shown in FIG. 10, it is supported by the necessary supporting work 56, and a formwork 57 for forming the head of the pillar is assembled, and cast-in-place concrete is casted. 12 is formed.

本発明方法によって形成される橋脚本体上の脚頭部及び柱頭部の一例を示す正面図である。It is a front view which shows an example of the leg head and pillar head on the pier main body formed by this invention method. 同上の側面図である。It is a side view same as the above. 本発明方法の実施の一例における地上におけるブラケット支保工と橋脚本体上でのブラケット支保工との組み立て状態を示す部分側面図である。It is a partial side view which shows the assembly state of the bracket support work on the ground and the bracket support work on a pier main body in an example of implementation of this invention method. 同上のブラケット支保工の分割状態の概略を示す平面図である。It is a top view which shows the outline of the division | segmentation state of a bracket support work same as the above. 図１に示す例におけるブラケット支保工の吊り上げ状態を示す部分側面図である。It is a partial side view which shows the lifting state of the bracket support in the example shown in FIG. 同上の正面図である。It is a front view same as the above. 図１に示す例における脚頭部形成状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the leg head formation state in the example shown in FIG. 図７柱の丸印部分の部分拡大図である。7 is a partially enlarged view of the circled portion of the pillar. 図１に示す例における柱頭部用ブラケット支保工組み立て状態を示す側面図である。It is a side view which shows the bracket support assembly construction state in the example shown in FIG. 図１に示す例における脚頭部用ブラケット吊り降ろし状態を示す側面図である。It is a side view which shows the bracket suspension for leg heads in the example shown in FIG. （ａ）〜（ｄ）は本発明方法の他の例の施工工程の概略を示す説明図である。(A)-(d) is explanatory drawing which shows the outline of the construction process of the other example of this invention method. 従来の柱頭部施工方法における柱頭部の橋脚本体上端部を形成している状態を示す側面図である。It is a side view which shows the state which forms the pier main body upper end part of the column head in the conventional column head construction method. 同じく柱頭部の片持梁基端部を形成している状態の側面図である。It is a side view of the state which forms the cantilever base end part of a pillar head similarly. 同じくワーゲンを使用して片持梁を延長している状態を示す側面図である。It is a side view which shows the state which similarly extended the cantilever beam using the wagen.

１０ 橋脚本体
１１ 脚頭部
１２ 柱頭部
１３ 片持梁基端部
１５ 架設梁
１６ 固定手段
１７ 垂下片
１８ 斜材
１９ 吊り操作手段
２０ ワイヤー
３０ 脚頭部用支保工
３１〜３４ 部分ブラケット支保工
３５ デッキ部
３６ 縦材
３７ 斜材
３８ ローラー
３９ アンカー
４５ 枠組み足場
４６ 型枠
５０ 柱頭部用ブラケット支保工
５１ 縦材
５２ デッキ部
５３ 斜材
５５ 簡易ブラケット支保工
５６ 支保工
５７ 型枠 DESCRIPTION OF SYMBOLS 10 Pier main body 11 Leg head 12 Column head 13 Cantilever base end part 15 Construction beam 16 Fixing means 17 Hanging piece 18 Diagonal member 19 Lifting operation means 20 Wire 30 Leg head support 31-34 Partial bracket support 35 Deck part 36 Longitudinal material 37 Diagonal material 38 Roller 39 Anchor 45 Framework scaffolding 46 Formwork 50 Pillar head bracket support 51 Vertical material 52 Deck part 53 Diagonal material 55 Simple bracket support 56 Support work 57 Formwork

Claims (4)

先に構築されている橋脚本体の上端に、橋桁を構成する柱頭部を支持させるための脚頭部を形成し、該脚頭部上に前記柱頭部を構築し、該柱頭部より片持式にて橋桁を張出し施工する片持架設工法における橋脚上部の施工方法において、
前記脚頭部を形成するための脚頭部用ブラケット支保工を前記橋脚本体の周囲の地上において組み立てるとともに、前記橋脚本体部の上端に吊り操作手段を支持させ、
該吊り操作手段をもって地上にて組み立てられた前記脚頭部用ブラケット支保工を所望の位置まで吊り上げ、該ブラケット支保工を橋脚本体部の上端部外周に固定し、
その固定されたブラケット支保工上に支持させて脚頭部成形用の型枠を組んで前記脚頭部を形成し、
該脚頭部を構築した後、前記柱頭部を形成するための柱頭部用ブラケット支保工を、前記脚頭部の外周に支持させて設置することを特徴としてなる片持架設工法における橋脚上部の施工方法。 A leg head for supporting the column head constituting the bridge girder is formed at the upper end of the previously constructed pier main body , the column head is constructed on the leg head, and cantilevered from the column head In the construction method of the upper part of the pier in the cantilever erection method where the bridge girder is stretched out at
Assembling a leg head bracket support for forming the leg head on the ground around the pier body, and supporting a suspension operation means on the upper end of the pier body part,
Lift the bracket support for the leg head assembled on the ground with the suspension operation means to a desired position, fix the bracket support to the outer periphery of the upper end of the pier body,
The leg head is formed by assembling a mold for molding the leg head by supporting it on the fixed bracket support,
After the leg head is constructed, the pillar head bracket support for forming the column head is supported and installed on the outer periphery of the leg head. Construction method. 前記脚頭部用ブラケット支保工の地上における組み立ては、全体を複数に分割した形状の複数の部分ブラケット支保工に形成し、その部分ブラケット支保工毎に前記橋脚本体の上端部外周の所定の位置まで吊り上げてそれぞれを橋脚本体に固定する請求項１に記載の片持架設工法における橋脚上部の施工方法。   Assembly on the ground of the bracket support for the leg head is formed into a plurality of partial bracket support having a shape divided into a plurality of parts, and a predetermined position on the outer periphery of the upper end portion of the pier main body for each partial bracket support The construction method of the upper part of the pier in the cantilever erection method according to claim 1, wherein each is lifted up to be fixed to the pier body. 前記脚頭部用ブラケット支保工の地上における組み立ては、橋脚本体全体の全周を囲む形状に全体を一体化させ、これを前記橋脚本体の上端部外周の所定の位置まで吊り上げて固定する請求項１に記載の片持架設工法における橋脚上部の施工方法。   The assembly of the bracket support for the leg head on the ground is made by integrating the whole into a shape surrounding the entire circumference of the pier body, and lifting it up to a predetermined position on the outer periphery of the upper end of the pier body. The construction method of the pier upper part in the cantilever erection method of 1. 前記脚頭部を構築した後、前記脚頭部成形用の型枠を解体し、前記脚頭部用ブラケット支保工を吊り操作手段により脚頭部の上端部外周まで引き上げて該脚頭部外周に固定し、これを柱頭部を形成するための柱頭部用ブラケット支保工として使用する請求項１，２又は３のいずれか１に記載の片持架設工法における橋脚上部の施工方法。   After the leg head is constructed, the leg head forming mold is disassembled, and the leg head bracket support is lifted up to the outer periphery of the upper end of the leg head by a suspension operation means. The construction method of the upper part of the pier in the cantilever construction method of any one of Claims 1, 2, or 3 used as a bracket support work for pillar heads for fixing to this and forming a pillar head part.
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