JP4669464B2 - Sidewalk superstructure and construction method of sidewalk superstructure - Google Patents

Sidewalk superstructure and construction method of sidewalk superstructure Download PDF

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JP4669464B2
JP4669464B2 JP2006298032A JP2006298032A JP4669464B2 JP 4669464 B2 JP4669464 B2 JP 4669464B2 JP 2006298032 A JP2006298032 A JP 2006298032A JP 2006298032 A JP2006298032 A JP 2006298032A JP 4669464 B2 JP4669464 B2 JP 4669464B2
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floor slab
sidewalk
superstructure
main girder
existing bridge
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JP2008115562A (en
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心平 大隅
廣重 笹山
達之助 宮本
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Nippon Engineering Co Ltd
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Sumikei Nikkei Engineering Co Ltd
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Description

本発明は、既設橋梁の側方に増設される歩道用上部構造およびその構築方法に関する。 The present invention relates to an upper structure for a sidewalk added to the side of an existing bridge and a construction method thereof .

歩道(歩行者用の通行帯だけでなく自転車などの軽車両用の通行帯も含む)が並設されていない既設橋梁に歩道を新設する場合や、既設橋梁上における車道の拡幅に伴って既存の歩道を撤去する必要があるものの車道の拡幅後も歩道を確保したい場合などにおいては、一般的には既設の橋梁に平行して、新規に歩道用の橋梁を新設していたが、橋梁を新設すると工期・工費が嵩んでしまうという問題がある。このような問題を解決するためには、本願出願人らが提案しているように、既設橋梁の側方に歩道用の上部構造(主桁や床版など)を増設する必要がある(特許文献1および特許文献2参照)。
特開2005−127065号公報 特開2005−127066号公報
When a sidewalk is newly installed on an existing bridge that does not have sidewalks (including not only pedestrian traffic zones but also bicycles and other light vehicles), or existing due to widening of the roadway on existing bridges When it is necessary to remove the sidewalk, but it is necessary to secure the sidewalk even after widening the roadway, in general, a new bridge for the sidewalk was newly installed in parallel with the existing bridge. If it is newly established, there is a problem that the construction period and construction cost increase. In order to solve such a problem, as proposed by the applicants of the present application, it is necessary to add an upper structure for the sidewalk (main girder, floor slab, etc.) to the side of the existing bridge (patent) Reference 1 and Patent Document 2).
JP 2005-127065 A JP 2005-127066 A

特許文献1に開示された技術は、既設橋梁の上部構造の一部である複数の主桁間に複数列の横桁を新設するとともに、既設橋梁の側方に向かって張り出すブラケットを各横桁の端面に固着し、ブラケット間に架設した主桁に歩道用の床版を敷設することによって、既設橋梁の側方に歩道用上部構造を後付けするものであるが、コンクリート製の横桁を構築する作業等に時間を費やしてしまうという問題がある。   The technique disclosed in Patent Document 1 newly installs a plurality of rows of girder between a plurality of main girders that are a part of the upper structure of the existing bridge, and each bracket is extended to the side of the existing bridge. It is fixed to the end face of the girder, and the slab for the sidewalk is installed on the side of the existing bridge by laying the floor slab for the sidewalk on the main girder installed between the brackets. There is a problem that time is spent for construction work.

また、特許文献2においては、既設橋梁の上部構造の一部である床版の側部に歩道用の上部構造(床版)の一部を上載することによって、歩道用上部構造を既設橋梁に後付けしているので、既設橋梁の床版の側部にある高欄等を撤去する必要がある。   Further, in Patent Document 2, a part of the upper structure for a sidewalk (floor slab) is placed on the side part of the floor slab which is a part of the upper structure of the existing bridge, thereby making the upper structure for the sidewalk into the existing bridge. Since it is retrofitted, it is necessary to remove the railings etc. on the side of the floor slab of the existing bridge.

加えて、特許文献1および特許文献2においては、歩道用上部構造を既設橋梁の上部構造に支持させているので、既設橋梁の下部構造のみならず上部構造に対しても新たな死荷重が作用することになり、場合によっては、既設橋梁の上部構造に対する補強や改造等が必要になる場合もある。   In addition, in Patent Document 1 and Patent Document 2, since the upper structure for the sidewalk is supported by the upper structure of the existing bridge, a new dead load acts not only on the lower structure of the existing bridge but also on the upper structure. In some cases, it may be necessary to reinforce or modify the superstructure of the existing bridge.

このような観点から、本発明は、既設橋梁の側方に増設される歩道用上部構造であって、これを構築する際に既設橋梁の上部構造に対して補強や改造を施す必要がない歩道用上部構造およびその構築方法を提供することを課題とする。 From this point of view, the present invention is an upper structure for a sidewalk that is added to the side of an existing bridge, and it is not necessary to reinforce or modify the upper structure of the existing bridge when constructing the upper structure. It is an object of the present invention to provide an upper structure for use and a construction method thereof.

このような課題を解決するために創案された本発明は、既設橋梁の側方に増設される歩道用上部構造であって、前記既設橋梁の下部構造の側面に固定されるブラケットと、前記ブラケット上に設置される主桁と、前記主桁上に敷設される床版とを備えることを特徴とする。
また、本発明に係る歩道用上部構造の構築方法は、既設橋梁の側方に歩道用上部構造を増設する歩道用上部構造の構築方法であって、前記既設橋梁の複数の下部構造のそれぞれにブラケットを固定する工程と、前記ブラケット上に設置される主桁および前記主桁上に敷設される床版を一体にしてなるユニットを、隣り合う前記ブラケット間に架設する工程と、を備えることを特徴とする。
The present invention devised to solve such problems is an upper structure for a sidewalk that is added to the side of an existing bridge, the bracket being fixed to a side surface of the lower structure of the existing bridge, and the bracket A main girder installed on the top and a floor slab laid on the main girder.
Further, the method for constructing the sidewalk superstructure according to the present invention is a method for constructing the sidewalk superstructure in which the sidewalk superstructure is added to the side of the existing bridge, and each of the plurality of substructures of the existing bridge is provided. A step of fixing a bracket, and a step of laying a unit comprising a main girder installed on the bracket and a floor slab laid on the main girder between adjacent brackets. Features.

本発明に係る歩道用上部構造によれば、その全荷重が既設橋梁の下部構造に作用することになるので、既設橋梁の上部構造に負荷がかかることはなく、したがって、歩道用上部構造を構築する際に、既設橋梁の上部構造に対して補強や改造を施す必要がない。また、主桁を支持するブラケットを既設橋梁の下部構造の側面に固定することとしたので、既設橋梁の上部構造の上面に構築された高欄等を撤去する必要もない。   According to the superstructure for sidewalks according to the present invention, since the total load acts on the substructure of the existing bridge, no load is applied to the superstructure of the existing bridge. When doing so, there is no need to reinforce or modify the superstructure of the existing bridge. In addition, since the bracket supporting the main girder is fixed to the side surface of the lower structure of the existing bridge, it is not necessary to remove the handrail constructed on the upper surface of the upper structure of the existing bridge.

なお、既設橋梁の下部構造には、橋台や橋脚が含まれるが、既設橋梁のスパンが短い場合など、対向して配置された一対の橋台のみで既設橋梁の上部構造が支持されている場合には、一対の橋台のそれぞれの側面にブラケットを固定し、前記ブラケット間に主桁を架設すればよい。   The existing bridge substructure includes abutments and piers, but the existing bridge superstructure is supported by only a pair of opposed abutments, such as when the span of the existing bridge is short. The bracket may be fixed to each side surface of the pair of abutments, and the main girder may be installed between the brackets.

前記床版の側縁部に防護柵を立設する場合には、前記主桁の側面に、前記床版の下面に沿って前記床版の側縁部まで張り出す張出部を設けておき、前記張出部の直上に防護柵の支柱を配置するとよい。このようにすると、防護柵の支柱の直下に位置する床版の撓みが小さくなるので、防護柵の傾倒を抑制することが可能となる。   When a protective fence is erected on the side edge of the floor slab, an overhanging portion is provided on the side surface of the main girder so as to extend to the side edge of the floor slab along the lower surface of the floor slab. It is preferable to place a support fence post directly above the overhang. If it does in this way, since the bending of the floor slab located just under the support fence post will become small, it will become possible to control tilting of the protection fence.

本発明においては、前記主桁および前記床版の少なくとも一方をアルミニウム合金製とすることが望ましい。なお、より好適には、前記主桁および前記床版の両方をアルミニウム合金製とすることが望ましい。歩道用上部構造が、軽量でありながらも強度が高いアルミニウム合金製の主桁や床版を含んでいれば、これらを鋼製やコンクリート製とした場合に比べて、既設橋梁の下部構造にかかる負荷を大幅に軽減することが可能となり、さらには、現場までの運搬や現場での取り回しも容易になるので、作業効率を向上させることが可能となる。   In the present invention, it is desirable that at least one of the main beam and the floor slab be made of an aluminum alloy. More preferably, both the main girder and the floor slab are made of an aluminum alloy. If the superstructure for the sidewalk includes lightweight but strong aluminum main girders and floor slabs, it will affect the substructure of the existing bridge compared to steel or concrete. The load can be greatly reduced, and further, the transportation to the site and the handling on the site are facilitated, so that the work efficiency can be improved.

本発明に係る歩道用上部構造によれば、これを構築する際に、既設橋梁の上部構造に対して補強や改造を施す必要がない。   According to the sidewalk superstructure according to the present invention, it is not necessary to reinforce or modify the superstructure of the existing bridge when constructing it.

図1に示すように、本実施形態に係る歩道用上部構造Jは、既設橋梁の側方に増設されるものであり、既設橋梁の上部構造(図示略)を支持する一対の橋台B(図1では一方のみを図示)の側面に固定されている。なお、本実施形態では、既設橋梁の上部構造を支持する下部構造が鉄筋コンクリート製の橋台Bである場合を例示するが、下部構造の構造形式や材質等を制限する趣旨ではない。   As shown in FIG. 1, the upper structure J for sidewalks according to the present embodiment is added to the side of an existing bridge, and a pair of abutments B (not shown) that support the upper structure (not shown) of the existing bridge. In FIG. 1, only one side is fixed to the side surface. In addition, although this embodiment illustrates the case where the lower structure that supports the upper structure of the existing bridge is an abutment B made of reinforced concrete, it is not intended to limit the structure type, material, or the like of the lower structure.

歩道用上部構造Jは、橋台Bの側面に固定されるブラケット1と、このブラケット1上に設置される主桁2,2と、この主桁2,2上に敷設される床版3と、主桁2の側面から側方に向かって張り出す張出部4と、床版3の側縁部に設置される防護柵5,5とを備えて構成されている。なお、床版3の上面には、薄層舗装6が施されている。   The superstructure J for sidewalk includes a bracket 1 fixed to the side surface of the abutment B, main girders 2 and 2 installed on the bracket 1, a floor slab 3 laid on the main girders 2 and 2, An overhanging portion 4 projecting sideways from the side surface of the main girder 2 and protective fences 5, 5 installed on the side edge of the floor slab 3 are configured. Note that a thin pavement 6 is provided on the upper surface of the floor slab 3.

ブラケット1は、橋台Bの側面に固定されるベース11と、このベース11に突設された基部12と、この基部12の先端に接続される支承部13と、基部12と支承部13とを連結するガセットプレート14とを備えて構成されている。   The bracket 1 includes a base 11 fixed to the side surface of the abutment B, a base 12 protruding from the base 11, a support part 13 connected to the tip of the base part 12, a base part 12 and a support part 13. A gusset plate 14 to be connected is provided.

ベース11は、鋼製の板材からなり、図2の(a)に示すように、橋台Bに植設されたアンカーボルト15を利用して橋台Bの側面に固定される。ベース11の上部および下部には、図2の(b)に示すように、挿通孔111,111,…が形成されている。挿通孔111には、橋台Bの側面から突出したアンカーボルト15(図2の(a)参照)が挿通される。また、ベース11の四隅には、ネジ孔112,112,…が形成されている。ネジ孔112には、橋台Bの側面とベース11の裏面との間隔を調整するための調整ボルト17(図2の(c)参照)が螺合される。なお、図2の(c)に示すように、ベース11の裏面と橋台Bの側面との間には、エポキシ樹脂などからなる充填材Fが介設される。   The base 11 is made of a steel plate, and is fixed to the side surface of the abutment B using anchor bolts 15 planted in the abutment B as shown in FIG. As shown in FIG. 2B, insertion holes 111, 111,... Are formed in the upper and lower portions of the base 11. As shown in FIG. An anchor bolt 15 (see FIG. 2A) protruding from the side surface of the abutment B is inserted into the insertion hole 111. Further, screw holes 112, 112,... Are formed at four corners of the base 11. An adjustment bolt 17 (see FIG. 2C) for adjusting the distance between the side surface of the abutment B and the back surface of the base 11 is screwed into the screw hole 112. As shown in FIG. 2C, a filler F made of an epoxy resin or the like is interposed between the back surface of the base 11 and the side surface of the abutment B.

基部12は、図2の(b)に示すように、上下一対のフランジ12a,12aとこれらを繋ぐウェブ12bとを備えるI形鋼やH形鋼などの鋼製の形材からなり、溶接によりベース11の表面に固着されている。基部12の先端部には、図2の(a)に示すように、挿通孔121,121,…が形成されている。挿通孔121には、ガセットプレート14を接合するための接合ボルト18(図1参照)が挿通される。   As shown in FIG. 2 (b), the base 12 is made of a steel shape such as an I-shaped steel or an H-shaped steel having a pair of upper and lower flanges 12a, 12a and a web 12b connecting these flanges. It is fixed to the surface of the base 11. As shown in FIG. 2A, insertion holes 121, 121,... Are formed at the distal end portion of the base portion 12. A joining bolt 18 (see FIG. 1) for joining the gusset plate 14 is inserted into the insertion hole 121.

支承部13は、基部12と同一断面の鋼製の形材からなり、ガセットプレート14,14,…を介して基部12に接続される。支承部13の基端部には、挿通孔131,131,…が形成されている。挿通孔131には、ガセットプレート14を接合するための接合ボルト18(図1参照)が挿通される。支承部13は、上下一対のフランジ13a,13aおよびウェブ13bに加えて、補強リブ13cと座板13dとを備えている。補強リブ13cは、主桁2の真下に配置されており(図1参照)、溶接によりフランジ13a,13aとウェブ13bとに固着されている。座板13dは、主桁2の真下に配置されており(図1参照)、溶接により上側のフランジ13aの上面に固着されている。   The support portion 13 is made of a steel profile having the same cross section as the base portion 12, and is connected to the base portion 12 through gusset plates 14, 14,. In the base end portion of the support portion 13, insertion holes 131, 131,... Are formed. A joining bolt 18 (see FIG. 1) for joining the gusset plate 14 is inserted into the insertion hole 131. The support portion 13 includes a reinforcing rib 13c and a seat plate 13d in addition to a pair of upper and lower flanges 13a and 13a and a web 13b. The reinforcing rib 13c is disposed directly below the main beam 2 (see FIG. 1), and is fixed to the flanges 13a and 13a and the web 13b by welding. The seat plate 13d is disposed directly below the main beam 2 (see FIG. 1), and is fixed to the upper surface of the upper flange 13a by welding.

なお、ブラケット1を構成するベース11、基部12、支承部13、ガセットプレート14をアルミニウム合金にて構成することも可能である。ブラケット1をアルミニウム合金製とすれば、歩道用上部構造Jの軽量化が促進され、既設橋梁の下部構造に対する負担も軽減する。   In addition, it is also possible to comprise the base 11, the base part 12, the support part 13, and the gusset plate 14 which comprise the bracket 1 with an aluminum alloy. If the bracket 1 is made of an aluminum alloy, weight reduction of the superstructure J for sidewalks is promoted, and the burden on the substructure of the existing bridge is reduced.

主桁2は、図3に示すように、ブラケット1,1間に架設されるものであり、本実施形態では、横板部21と、この横板部21の上面中央部に立設された縦板部22とを備えていて、図1に示すように、断面逆T字形状を呈している。横板部21は、アルミニウム合金製の板材からなり、その長手方向の端部がブラケット1の座板13dに載置され、固定ボルト23を利用してブラケット1に固定されている。縦板部22は、横板部21と同一の長さを有するアルミニウム合金製の板材からなり、溶接により横板部21の上面に固着されている。縦板部22の上縁部には、床版3の裏側の形状に沿うように複数の凹部22a,22a,…が形成されている。   As shown in FIG. 3, the main girder 2 is constructed between the brackets 1 and 1. In the present embodiment, the main girder 2 is erected at the horizontal plate portion 21 and the central portion of the upper surface of the horizontal plate portion 21. The vertical plate portion 22 is provided, and as shown in FIG. The lateral plate portion 21 is made of a plate material made of an aluminum alloy, and an end portion in the longitudinal direction is placed on the seat plate 13 d of the bracket 1 and is fixed to the bracket 1 using a fixing bolt 23. The vertical plate portion 22 is made of an aluminum alloy plate having the same length as the horizontal plate portion 21 and is fixed to the upper surface of the horizontal plate portion 21 by welding. A plurality of concave portions 22a, 22a,... Are formed on the upper edge portion of the vertical plate portion 22 so as to follow the shape of the back side of the floor slab 3.

なお、左右の主桁2,2は、平行に配置されており、同様の構成を備えているが、左右の主桁2,2上に敷設される床版3に片勾配が形成されるように(図6の(b)参照)、一方の縦板部22が他方の縦板部22よりも低くなっている。   The left and right main girders 2 and 2 are arranged in parallel and have the same configuration, but a single slope is formed on the floor slab 3 laid on the left and right main girders 2 and 2. In addition, (see FIG. 6B), one vertical plate portion 22 is lower than the other vertical plate portion 22.

床版3は、図4に示すように、複数の床版構成材31,31,…によって構成されている。床版構成材31は、アルミニウム合金製の押出形材からなり、主桁2と交差する方向(橋軸直角方向)が長手方向(押出方向)になっていて、複数の床版構成材31,31,…を短手方向に連設することで、床版3が構成されている。床版構成材31は、表面板部31aと、この表面板部31aの裏側中央部に形成された補剛部31bとを備えている。補剛部31bは、その外形が主桁2の凹部22aと略同形になっている。隣り合う床版構成材31,31は、その表面板部31a,31aの側縁部同士を突き合せ、その突合部(継ぎ目)に沿って摩擦攪拌接合または溶接を施すことにより互いに接合される。なお、張出部4の直上に位置する床版構成材31の端部には、挿通孔311が形成されている。挿通孔311には、防護柵5(図3参照)を固定するための固定ボルト55(図3参照)が挿通される。   As shown in FIG. 4, the floor slab 3 is composed of a plurality of floor slab components 31, 31,. The floor slab component 31 is made of an extruded shape made of an aluminum alloy, and the direction intersecting the main girder 2 (the direction perpendicular to the bridge axis) is the longitudinal direction (extrusion direction). The floor slab 3 is configured by connecting 31,... In a short direction. The floor slab component 31 includes a surface plate portion 31a and a stiffening portion 31b formed at the center on the back side of the surface plate portion 31a. The stiffening portion 31b has substantially the same outer shape as the concave portion 22a of the main girder 2. Adjacent floor slab components 31, 31 are joined to each other by abutting the side edges of the surface plate portions 31 a, 31 a and performing friction stir welding or welding along the abutting portion (seam). An insertion hole 311 is formed at the end of the floor slab component 31 positioned directly above the overhanging portion 4. A fixing bolt 55 (see FIG. 3) for fixing the protective fence 5 (see FIG. 3) is inserted through the insertion hole 311.

床版3は、溶接により主桁2の上端部に固着される。本実施形態では、床版構成材31の補剛部31bを主桁2の凹部22aに挿入しつつ床版構成材31の表面板部31aの裏面を主桁2の上端縁に当接させ、主桁2との接触部分に沿って溶接を施すことで、床版3が主桁2の上端部に固着される。なお、床版3の側端面には、当該側端面を覆い隠す化粧材32(図6の(a)参照)が固着される。   The floor slab 3 is fixed to the upper end of the main girder 2 by welding. In this embodiment, the back surface of the surface plate portion 31a of the floor slab component 31 is brought into contact with the upper edge of the main girder 2 while the stiffening portion 31b of the floor slab component 31 is inserted into the recess 22a of the main girder 2. The floor slab 3 is fixed to the upper end of the main girder 2 by welding along the contact portion with the main girder 2. A decorative material 32 (see FIG. 6A) that covers the side end surface is fixed to the side end surface of the floor slab 3.

張出部4は、主桁2の外側の側面(他の主桁2と対向する側面とは反対側の側面)から床版3の下面に沿って床版3の側縁部まで張り出している。より詳細に、張出部4は、主桁2に直交するように配置された支持部41と、この支持部41に支持された当接部42と、この当接部42の上面に立設された立上部43とを備えて構成されている。   The overhanging portion 4 projects from the outer side surface of the main girder 2 (the side surface opposite to the side facing the other main girder 2) to the side edge of the floor slab 3 along the lower surface of the floor slab 3. . More specifically, the overhanging portion 4 is erected on a support portion 41 arranged so as to be orthogonal to the main beam 2, a contact portion 42 supported by the support portion 41, and an upper surface of the contact portion 42. And an upright portion 43 formed.

支持部41は、主桁2の隣り合う凹部22a,22aの間から側方に向かって張り出していて、主桁2の側面に直交する鉛直面内に配置されている。支持部41は、先端部に向かうに従って高さ寸法が漸減するような形状を備えたアルミニウム合金製の板材からなり、溶接により、主桁2の横板部21の上面と縦板部22の側面とに固着されている。なお、支持部41の上端縁は、床版3(図1参照)の片勾配と等しい勾配で傾斜している。   The support portion 41 protrudes laterally from between the adjacent recesses 22 a and 22 a of the main girder 2 and is disposed in a vertical plane orthogonal to the side surface of the main girder 2. The support portion 41 is made of a plate material made of aluminum alloy having a shape in which the height dimension gradually decreases toward the tip portion, and is welded to the upper surface of the horizontal plate portion 21 of the main girder 2 and the side surface of the vertical plate portion 22. It is fixed to and. In addition, the upper end edge of the support part 41 inclines with the gradient equal to the single gradient of the floor slab 3 (refer FIG. 1).

当接部42は、支持部41の上端に載置されていて、床版3を主桁2上に敷設したときに、床版3の裏面(より詳細には、隣り合う補剛部31b,31bの下面)に当接する。当接部42は、支持部41の両側(前後)に張り出るアルミニウム合金製の板材からなり、溶接により支持部41と主桁2の縦板部22の側面とに固着されている。当接部42の先端部には、床版構成材31の挿通孔311に対応する挿通孔421が形成されている。挿通孔421には、防護柵5(図3参照)を固定するための固定ボルト55(図3参照)が挿通される。   The contact portion 42 is placed on the upper end of the support portion 41, and when the floor slab 3 is laid on the main girder 2, the back surface of the floor slab 3 (more specifically, adjacent stiffening portions 31b, The lower surface of 31b. The abutting portion 42 is made of an aluminum alloy plate projecting on both sides (front and rear) of the support portion 41, and is fixed to the support portion 41 and the side surface of the vertical plate portion 22 of the main girder 2 by welding. An insertion hole 421 corresponding to the insertion hole 311 of the floor slab component 31 is formed at the tip of the contact portion 42. A fixing bolt 55 (see FIG. 3) for fixing the protective fence 5 (see FIG. 3) is inserted through the insertion hole 421.

立上部43は、主桁2の隣り合う凹部22a,22aの間から側方に向かって張り出していて、床版3を主桁2に敷設したときに、床版3の隣り合う補剛部31b,31bの間に入り込み、かつ、表面板部31aの裏面に当接する。立上部43は、アルミニウム合金製の板材からなり、溶接により当接部42の上面と主桁2の縦板部22の側面とに固着されている。   The upright portion 43 projects laterally from between the adjacent recesses 22a, 22a of the main girder 2 and when the floor slab 3 is laid on the main girder 2, the adjacent stiffening portion 31b of the floor slab 3 is provided. , 31b and abuts against the back surface of the front plate portion 31a. The upright portion 43 is made of a plate material made of an aluminum alloy, and is fixed to the upper surface of the contact portion 42 and the side surface of the vertical plate portion 22 of the main girder 2 by welding.

なお、主桁2の縦板部22を挟んで張出部4の反対側には、補強リブ44が配置されている。補強リブ44は、張出部4の支持部41と面一になるように配置されていて、溶接により横板部21の上面と主桁2の内側の側面(他の主桁2と対向する側面)とに固着されている。   A reinforcing rib 44 is disposed on the opposite side of the overhanging portion 4 with the vertical plate portion 22 of the main girder 2 interposed therebetween. The reinforcing rib 44 is disposed so as to be flush with the support portion 41 of the overhanging portion 4 and is welded so as to face the upper surface of the horizontal plate portion 21 and the inner side surface of the main beam 2 (opposite to the other main beam 2). To the side).

防護柵5は、図3に示すように、床版3の側縁部に立設される複数の支柱51,51,…と、支柱51,51,…の上端に設置された上梁52と、隣り合う支柱51,51の下端部間に設置された下梁53と、上梁52と下梁53との間に配置された複数の格子54,54,…とを備えて構成されている。防護柵5の構成に特に制限はないが、本実施形態のように、張出部4の直上に支柱51を配置することが望ましい。支柱51は、その下端部に固着されたフランジ51aに挿通した固定ボルト55を利用して、床版3の上面に固定される。なお、固定ボルト55は、支柱51のフランジ51a、床版3の表面板部31a(図4参照)、補剛部31bおよび張出部4の当接部42を貫通している。   As shown in FIG. 3, the protective fence 5 includes a plurality of columns 51, 51,... Standing on the side edge of the floor slab 3, and upper beams 52 installed at the upper ends of the columns 51, 51,. The lower beam 53 installed between the lower ends of the adjacent columns 51, 51, and a plurality of lattices 54, 54,... Disposed between the upper beam 52 and the lower beam 53. . Although there is no restriction | limiting in particular in the structure of the protection fence 5, It is desirable to arrange | position the support | pillar 51 just above the overhang | projection part 4 like this embodiment. The column 51 is fixed to the upper surface of the floor slab 3 by using a fixing bolt 55 inserted through a flange 51a fixed to the lower end of the column 51. The fixing bolt 55 passes through the flange 51 a of the support column 51, the surface plate portion 31 a (see FIG. 4) of the floor slab 3, the stiffening portion 31 b, and the contact portion 42 of the overhang portion 4.

薄層舗装6は、ゴムチップ舗装など軽量なものであることが望ましいが、これに限定されるものではない。なお、薄層舗装6に代えて、滑り止め骨材などを含む滑り止め用の塗料を床版3の上面に塗布してもよい。   The thin pave 6 is desirably lightweight such as rubber chip pavement, but is not limited to this. Instead of the thin pavement 6, a non-slip paint including a non-slip aggregate may be applied to the upper surface of the floor slab 3.

次に、以上のように構成された歩道用上部構造Jの構築方法を詳細に説明する。
まず、図5の(a)に示すように、橋台Bの側面にアンカー挿通穴B1を穿設し、このアンカー挿通穴B1に、エポキシアクリレート樹脂や硬化剤などが封入された図示せぬカプセル(所謂樹脂カプセル)を挿入する。次に、アンカーボルト15をアンカー挿通穴B1に挿入して図示せぬカプセルを破壊し、カプセル内の溶液によってアンカーボルト15をアンカー挿通穴B1に固定する。
Next, the construction method of the sidewalk superstructure J configured as described above will be described in detail.
First, as shown in FIG. 5A, an anchor insertion hole B1 is drilled in the side surface of the abutment B, and a capsule (not shown) in which an epoxy acrylate resin or a curing agent is sealed in the anchor insertion hole B1. A so-called resin capsule) is inserted. Next, the anchor bolt 15 is inserted into the anchor insertion hole B1 to break the capsule (not shown), and the anchor bolt 15 is fixed to the anchor insertion hole B1 with the solution in the capsule.

続いて、図5の(b)および(c)に示すように、アンカーボルト15を利用してブラケット1を橋台Bの側面に取り付ける。具体的には、図5の(b)に示すように、まず、基部12が固着されたベース11を橋台Bの側面に固定し、その後、図5の(c)に示すように、ガセットプレート14,14,…を利用して基部12に支承部13を接続すればよい。   Subsequently, as shown in FIGS. 5B and 5C, the bracket 1 is attached to the side surface of the abutment B using the anchor bolt 15. Specifically, as shown in FIG. 5B, first, the base 11 to which the base portion 12 is fixed is fixed to the side surface of the abutment B, and then, as shown in FIG. The support 13 may be connected to the base 12 using 14, 14,.

なお、ベース11を橋台Bに固定するには、図2の(c)に示すように、調整ボルト17の軸部をベース11の裏面側に突出させてベース11の裏面と橋台Bの側面との間に隙間を確保しつつ、アンカーボルト15とナット16を用いてベース11を橋台Bの側面に仮止めし、調整ボルト17の突出量を調整して前記隙間の間隔を調整した後でナット16を締め付け、さらに、ベース11の下辺と両側辺とに沿って前記した隙間をシールしたうえで、エポキシ樹脂などからなる充填材Fを前記した隙間に充填し、硬化させればよい。   In order to fix the base 11 to the abutment B, as shown in FIG. 2C, the shaft portion of the adjustment bolt 17 protrudes toward the back side of the base 11, and the back surface of the base 11 and the side surface of the abutment B The base 11 is temporarily fixed to the side surface of the abutment B using the anchor bolt 15 and the nut 16 while securing a gap between the nuts, and after adjusting the protruding amount of the adjusting bolt 17 to adjust the gap interval, the nut 16 is tightened, and the gap described above is sealed along the lower side and both sides of the base 11, and then the filler F made of epoxy resin or the like is filled in the gap and cured.

次に、図6の(a)に示すように、一対の主桁2,2、床版3および張出部4を予め一体にしてなるユニットをブラケット1,1間に架設し、固定ボルト23,23,…を利用して、各主桁2の端部をブラケット1に固定する。その後、図6の(b)に示すように、床版3の側縁部に防護柵5を設置し、さらに、床版3の上面に薄層舗装6を施すなどすると、歩道用上部構造Jが完成する。なお、一対の主桁2,2、床版3、張出部4および防護柵5を予め一体にしてなるユニットをブラケット1,1間に架設しても差し支えないし、これらを一体にせずに、ブラケット1,1間に主桁2,2を架設してから、床版3を主桁2,2上に敷設しても差し支えない。   Next, as shown in FIG. 6A, a unit in which the pair of main girders 2 and 2, the floor slab 3 and the overhanging portion 4 are integrated in advance is installed between the brackets 1 and 1, and the fixing bolt 23 , 23,... Are used to fix the end of each main beam 2 to the bracket 1. After that, as shown in FIG. 6 (b), when a protective fence 5 is installed on the side edge of the floor slab 3 and a thin pave 6 is further provided on the upper surface of the floor slab 3, the superstructure for sidewalk J Is completed. It should be noted that a unit in which the pair of main girders 2 and 2, the floor slab 3, the overhanging portion 4, and the protective fence 5 are integrated in advance may be installed between the brackets 1 and 1. After the main girders 2 and 2 are installed between the brackets 1 and 1, the floor slab 3 may be laid on the main girders 2 and 2.

以上説明した本実施形態に係る歩道用上部構造Jによれば、既設橋梁に平行して歩道用の橋梁を新設していた従来工法の場合に比べて、既設橋梁の側方に簡易迅速に歩道を増設することが可能となる。つまり、歩道用上部構造Jによれば、歩道が並設されていな既設橋梁に簡易迅速に歩道を新設することが可能となり、既設橋梁上における車道の拡幅に伴って既存の歩道を撤去する場合においては、簡易迅速に新たな歩道を確保することが可能となる。   According to the superstructure J for sidewalks according to the present embodiment described above, the sidewalk can be easily and quickly located on the side of the existing bridge as compared to the conventional method in which a bridge for sidewalk is newly installed in parallel with the existing bridge. Can be added. In other words, according to the superstructure J for sidewalks, it is possible to quickly and quickly establish a new sidewalk on an existing bridge where sidewalks are not juxtaposed, and when the existing sidewalk is removed along with the widening of the roadway on the existing bridge It is possible to secure a new sidewalk easily and quickly.

加えて、歩道用上部構造Jによれば、その全荷重が既設橋梁の橋台Bに作用することになるので、既設橋梁の上部構造に負荷がかかることはなく、したがって、歩道用上部構造Jを構築する際に、既設橋梁の上部構造に対して補強や改造を施す必要がない。また、主桁2を支持するブラケット1を既設橋梁の橋台Bに固定することとしたので、既設橋梁の上部構造の上面に構築された高欄等を撤去する必要もない。   In addition, according to the superstructure J for sidewalks, since the total load acts on the abutment B of the existing bridge, there is no load on the superstructure of the existing bridge. When building, it is not necessary to reinforce or modify the superstructure of the existing bridge. Moreover, since the bracket 1 that supports the main girder 2 is fixed to the abutment B of the existing bridge, there is no need to remove the handrail constructed on the upper surface of the upper structure of the existing bridge.

また、本実施形態では、主桁2の側面に張出部4を設け、この張出部4の直上に防護柵5の支柱51を配置しているので、支柱51の直下に位置する床版3の撓みが小さくなり、ひいては、防護柵5の傾倒を抑制することが可能となる。   Moreover, in this embodiment, since the overhang | projection part 4 is provided in the side surface of the main girder 2, and the support | pillar 51 of the protection fence 5 is arrange | positioned directly on this overhang | projection part 4, the floor slab located directly under the support | pillar 51 3 is reduced, and as a result, the tilt of the protective fence 5 can be suppressed.

さらに、本実施形態では、主桁2および床版3を、軽量でありながらも強度が高いアルミニウム合金製としているので、これらを鋼製やコンクリート製とした場合に比べて、既設橋梁の橋台Bにかかる負荷を大幅に軽減することが可能となり、さらには、現場までの運搬や現場での取り回しも容易になるので、作業効率を向上させることが可能となる。   Further, in the present embodiment, the main girder 2 and the floor slab 3 are made of aluminum alloy which is lightweight but has high strength, so that the abutment B of the existing bridge is compared with the case where these are made of steel or concrete. In addition, it is possible to greatly reduce the load on the machine, and further, it becomes easy to carry to the site and manage the site, so that the work efficiency can be improved.

例えば、主桁2の長さが10mで、有効幅員が2mの場合を想定すると、歩道用上部構造Jの重量が、主桁2と床版3を鋼製とした場合の1/3程度に抑えられるので、一対の主桁2,2、床版3、張出部4などをユニット化した状態で運搬し、一括して架設をすることが可能となる。主桁2,2、床版3、張出部4などをユニット化した状態で運搬・架設できれば、現場での作業工数を削減することが可能となるので、歩道用上部構造Jの設置作業に要する日数を、ユニット化しない場合の1/10〜1/3程度に短縮することが可能となる。   For example, assuming that the length of the main girder 2 is 10 m and the effective width is 2 m, the weight of the superstructure J for sidewalks is about 1/3 of the case where the main girder 2 and the floor slab 3 are made of steel. Therefore, the pair of main girders 2 and 2, the floor slab 3, the overhanging portion 4, and the like can be transported in a united state and erected in a lump. If the main girder 2, 2, floor slab 3, overhanging part 4, etc. can be transported and installed in a united state, it will be possible to reduce the work man-hours at the site. The number of days required can be reduced to about 1/10 to 1/3 of the case where the unit is not unitized.

また、本実施形態では、充填材Fを介してベース11の裏面全体を橋台Bの側面に密着させたので、ベース11に作用する力がベース11全体に分散することになる。   In this embodiment, since the entire back surface of the base 11 is brought into close contact with the side surface of the abutment B via the filler F, the force acting on the base 11 is dispersed throughout the base 11.

なお、歩道用上部構造Jの構成は、適宜変更しても差し支えない。例えば、前記した実施形態では、二つのブラケット1,1で主桁2,2等を支持したが、対向する一対の橋台間に橋脚が設置されている場合には、二つの橋台と橋脚の各々の側面にブラケット1を取り付け、三つ以上のブラケット1で主桁2,2等を支持してもよい。   Note that the configuration of the sidewalk superstructure J may be changed as appropriate. For example, in the above-described embodiment, the main girders 2 and 2 are supported by the two brackets 1 and 1, but when a pier is installed between a pair of opposed abutments, each of the two abutments and the piers The brackets 1 may be attached to the side surfaces of the main girder 2, and the main girders 2 and 2 may be supported by three or more brackets 1.

また、本実施形態では、左右一対の主桁2,2をブラケット1,1間に架設した場合を例示したが、平行に配置された三本以上の主桁をブラケット1,1間に架設してもよい。また、本実施形態では、主桁2の断面形状を断面逆T字形状とした場合を例示したが、断面横H字状やI字状としても差し支えないし、箱桁としても差し支えない。   Further, in the present embodiment, the case where the pair of left and right main girders 2 and 2 are installed between the brackets 1 and 1 is illustrated, but three or more main girders arranged in parallel are installed between the brackets 1 and 1. May be. Moreover, although the case where the cross-sectional shape of the main girder 2 was an inverted T-shaped cross section was illustrated in the present embodiment, it may be a horizontal H shape or I-shaped cross section, or may be a box girder.

また、床版3を構成する床版構成材31の形態も図示のものに限定されることはなく、適宜変更しても差し支えない。例えば、図示は省略するが、板状の表面板部31aのみからなる床版構成材であっても差し支えないし、断面矩形の中空押出形材からなる床版構成材であっても差し支えない。なお、板状の表面板部31aのみからなる床版構成材や断面矩形の中空押出形材からなる床版構成材を使用する場合には、床版3の裏面が平坦になるが、この場合には、主桁2の凹部22aを省略して主桁2の上端縁を直線状に成形し、主桁2の上端縁の全部を床版3の裏面に当接させることが望ましい。   Further, the form of the floor slab constituting material 31 constituting the floor slab 3 is not limited to the illustrated one, and may be appropriately changed. For example, although illustration is omitted, it may be a floor slab component made of only a plate-like surface plate portion 31a, or may be a floor slab component made of a hollow extruded profile having a rectangular cross section. In addition, in the case of using a floor slab component composed only of the plate-shaped surface plate portion 31a or a floor slab component composed of a hollow extruded section having a rectangular cross section, the back surface of the floor slab 3 becomes flat. For this purpose, it is desirable that the recess 22a of the main beam 2 is omitted, the upper edge of the main beam 2 is formed in a straight line, and the entire upper edge of the main beam 2 is brought into contact with the back surface of the floor slab 3.

本発明の実施形態に係る歩道用上部構造を示す破断斜視図である。It is a fracture perspective view showing the upper structure for sidewalks concerning the embodiment of the present invention. (a)はブラケットの構成を説明するための分解側面図、(b)は(a)のX−X線断面図、(c)は拡大側断面図である。(A) is an exploded side view for demonstrating the structure of a bracket, (b) is XX sectional drawing of (a), (c) is an expanded sectional side view. 本発明の実施形態に係る歩道用上部構造を示す破断正面図である。It is a fracture front view showing the upper structure for sidewalks concerning the embodiment of the present invention. 主桁および床版の構成を説明するための分解斜視図である。It is a disassembled perspective view for demonstrating the structure of a main girder and a floor slab. (a)〜(c)は、歩道用上部構造の構築手順を説明するための側面図である。(A)-(c) is a side view for demonstrating the construction procedure of the superstructure for walkways. (a)および(b)は、図5の(c)に続く構築手順を説明するための側面図である。(A) And (b) is a side view for demonstrating the construction procedure following (c) of FIG.

符号の説明Explanation of symbols

J 歩道用上部構造
1 ブラケット
2 主桁
3 床版
4 張出部
5 防護柵
51 支柱
B 橋台(下部構造)
J Upper structure for sidewalk 1 Bracket 2 Main girder 3 Floor slab 4 Overhang 5 Guard fence 51 Post B Abutment (under structure)

Claims (5)

既設橋梁の側方に増設される歩道用上部構造であって、
前記既設橋梁の下部構造の側面に固定されるブラケットと、
前記ブラケット上に設置される主桁と、
前記主桁上に敷設される床版とを備えることを特徴とする歩道用上部構造。
It is a superstructure for sidewalks added to the side of the existing bridge,
A bracket fixed to a side surface of the lower structure of the existing bridge;
A main girder installed on the bracket;
A sidewalk superstructure comprising a floor slab laid on the main girder.
既設橋梁の側方に増設される歩道用上部構造であって、
前記既設橋梁の一対の橋台のそれぞれの側面に固定されるブラケットと、
前記ブラケット間に架設される主桁と、
前記主桁上に敷設される床版とを備えることを特徴とする歩道用上部構造。
It is a superstructure for sidewalks added to the side of the existing bridge,
A bracket fixed to each side surface of a pair of abutments of the existing bridge;
A main girder erected between the brackets;
A sidewalk superstructure comprising a floor slab laid on the main girder.
前記主桁の側面に、前記床版の下面に沿って前記床版の側縁部まで張り出す張出部が設けられており、
前記張出部の直上に、前記床版の側縁部に立設される防護柵の支柱が配置されていることを特徴とする請求項1または請求項2に記載の歩道用上部構造。
On the side surface of the main girder, an overhanging portion is provided that extends to the side edge of the floor slab along the lower surface of the floor slab,
The upper structure for a sidewalk according to claim 1 or 2, wherein a support fence post erected on a side edge of the floor slab is disposed immediately above the projecting portion.
前記主桁および前記床版の少なくとも一方がアルミニウム合金製であることを特徴とする請求項1乃至請求項3のいずれか一項に記載の歩道用上部構造。   The upper structure for sidewalks according to any one of claims 1 to 3, wherein at least one of the main beam and the floor slab is made of an aluminum alloy. 既設橋梁の側方に歩道用上部構造を増設する歩道用上部構造の構築方法であって、It is a construction method of the superstructure for the sidewalk that adds the superstructure for the sidewalk to the side of the existing bridge,
前記既設橋梁の複数の下部構造のそれぞれにブラケットを固定する工程と、Fixing a bracket to each of the plurality of substructures of the existing bridge;
前記ブラケット上に設置される主桁および前記主桁上に敷設される床版を一体にしてなるユニットを、隣り合う前記ブラケット間に架設する工程と、を備えることを特徴とする歩道用上部構造の構築方法。A superstructure for a sidewalk, comprising: a unit in which a main girder installed on the bracket and a floor slab laid on the main girder are integrated; How to build.
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KR100977482B1 (en) 2010-02-16 2010-08-23 우경건설 주식회사 Pedestrian bridges where installation is easy for existence road slope
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JPS61141313U (en) * 1985-02-18 1986-09-01
JP2005127065A (en) * 2003-10-24 2005-05-19 Pc Bridge Co Ltd Widened sidewalk structure for existing bridge, and method of constructing sidewalk structure

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JPS56176211U (en) * 1980-05-26 1981-12-25
JPS61141313U (en) * 1985-02-18 1986-09-01
JP2005127065A (en) * 2003-10-24 2005-05-19 Pc Bridge Co Ltd Widened sidewalk structure for existing bridge, and method of constructing sidewalk structure

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