JP7438441B1 - How to update bridges - Google Patents
How to update bridges Download PDFInfo
- Publication number
- JP7438441B1 JP7438441B1 JP2023175945A JP2023175945A JP7438441B1 JP 7438441 B1 JP7438441 B1 JP 7438441B1 JP 2023175945 A JP2023175945 A JP 2023175945A JP 2023175945 A JP2023175945 A JP 2023175945A JP 7438441 B1 JP7438441 B1 JP 7438441B1
- Authority
- JP
- Japan
- Prior art keywords
- steel frame
- bridge
- filling
- wall
- renewal method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 94
- 239000010959 steel Substances 0.000 claims abstract description 94
- 239000000463 material Substances 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 42
- 239000000945 filler Substances 0.000 claims description 8
- 238000005187 foaming Methods 0.000 claims description 5
- 239000012779 reinforcing material Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 abstract description 9
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 239000006261 foam material Substances 0.000 description 6
- 238000005429 filling process Methods 0.000 description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920005990 polystyrene resin Polymers 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
【課題】既設橋梁の床板下の空間を壁部で閉鎖し内部に固化材を充填することで新たに盛土構造物を構築する橋梁の更新方法を提供すること。【解決手段】本発明の橋梁の更新方法1は、橋梁10の床板12下部の地盤に基礎コンクリート21を構築する、基礎工程S1と、基礎コンクリート21上に鋼枠体31を配置する、配置工程S2と、鋼枠体31の枠間に壁面材32を付設して壁部30を構築し、床板12の下部に壁部30で遮蔽した充填空間Aを画設する、遮蔽工程S3と、充填空間A内に固化材40を充填する、充填工程S4と、を備え、橋梁10の平面視において、鋼枠体31全体を床板12の幅方向内側に配置したことを特徴とする。【選択図】図6[Problem] To provide a bridge renewal method that constructs a new embankment structure by closing the space under the floorboard of an existing bridge with a wall and filling the inside with a solidifying material. [Solution] A bridge renewal method 1 of the present invention includes a foundation step S1 in which a foundation concrete 21 is constructed on the ground below a deck plate 12 of a bridge 10, and a placement step S1 in which a steel frame 31 is placed on the foundation concrete 21. S2, a shielding step S3 in which a wall material 32 is attached between the frames of the steel frame body 31 to construct a wall portion 30, and a filling space A shielded by the wall portion 30 is defined in the lower part of the floor plate 12; It is characterized in that it includes a filling step S4 in which the space A is filled with the solidifying material 40, and the entire steel frame 31 is disposed inside the floor plate 12 in the width direction when the bridge 10 is viewed from above. [Selection diagram] Figure 6
Description
本発明は橋梁の更新方法に関し、特に、既設橋梁の床板下の空間を壁部で閉鎖し内部に固化材を充填することで新たに盛土構造物を構築する橋梁の更新方法に関する。 The present invention relates to a bridge renewal method, and in particular to a bridge renewal method in which a new embankment structure is constructed by closing the space under the floorboard of an existing bridge with a wall and filling the inside with a solidifying material.
日本全国に存在する約73万橋の橋梁の内、今から10年後には建設後50年を経過する橋梁の数が総数の約57%に急増するとされている(令和4年8月「日本の橋梁の現状~建設から管理の時代への移行~」国土交通省中部地方整備局)。
橋梁の高齢化が進むことで、繰り返し過重による床板の亀裂や支承の破損、塩害による鋼製部材の腐食、中性化によるコンクリートのひび割れ等の損傷が生じ、橋梁本来の機能が損なわれるおそれがある他、コンクリートの剥落や部材の落下の発生も懸念されている。
老朽化した橋を更新する方法として、特許文献1には、橋梁の下部にポリスチレン系樹脂発泡体ブロックを積層し、橋梁の側面に沿った所定の間隔で複数の鋼材を立設し、鋼材の間に矩形のパネルを設け、ポリスチレン系樹脂発泡体ブロックの上部に発泡ウレタンを充填することで、橋梁と一体化した補強構造体を構築する工法が開示されている。
類似の工法として、橋梁の側面に沿った所定の間隔で複数のH鋼を立設し、H鋼の前面に矩形の壁面パネルを設置し、橋脚と壁面パネルで仕切った空間内にエアモルタルを充填することで、橋梁の下部空間を埋めて盛土構造物を構築する工法が実施されている(図10)。
Of the approximately 730,000 bridges that exist across Japan, it is estimated that 10 years from now, the number of bridges that have been constructed for 50 years will rapidly increase to approximately 57% of the total (August 2020). Current state of bridges in Japan: Transition from construction to management era” (Ministry of Land, Infrastructure, Transport and Tourism, Chubu Regional Development Bureau).
As bridges continue to age, damage such as cracks in deck plates and damage to bearings due to repeated overloading, corrosion of steel members due to salt damage, and cracks in concrete due to carbonation may occur, and there is a risk that the original functions of bridges may be impaired. In addition, there are concerns about concrete spalling and parts falling.
As a method for renewing aging bridges, Patent Document 1 discloses that polystyrene resin foam blocks are stacked at the bottom of the bridge, a plurality of steel members are erected at predetermined intervals along the sides of the bridge, and the steel members are A construction method is disclosed in which a reinforced structure integrated with a bridge is constructed by providing a rectangular panel between the blocks and filling the upper part of the polystyrene resin foam block with foamed urethane.
A similar construction method involves erecting multiple H-beams at predetermined intervals along the side of a bridge, installing rectangular wall panels in front of the H-beams, and applying air mortar in the space partitioned by the piers and wall panels. A method of filling the space beneath a bridge and constructing an embankment structure is being implemented (Figure 10).
従来技術には、以下のような欠点がある。
<1>H鋼の支柱を地盤へ鉛直方向に貫入するため、床板が支障となり支柱を床板の直下に建て込むことができない。このため、壁面パネルを橋梁から幅方向にセットバックした位置に配列せざるを得ず、用地を広く占用することで、用地の取得コストが嵩む。
<2>壁面パネルのセットバックによって、エアモルタルの充填空間が橋梁の幅方向両側に広がるため、エアモルタルの充填量が過大となり、材料コストが嵩む。
<3>H鋼を貫入するために大型の重機が必要であり、施工コストが嵩むとともに、重機を設置するための用地の確保が必要となる。
<4>H鋼の根入れが十分でない場合、エアモルタルの充填によって壁面パネルの背面に側圧がかかり、壁面パネルが前面側に孕み出すおそれがある。
The conventional technology has the following drawbacks.
<1> Since the H-steel columns penetrate vertically into the ground, the floorboards become a hindrance, making it impossible to erect the columns directly below the floorboards. For this reason, the wall panels have to be arranged in a position set back from the bridge in the width direction, which occupies a large area of land, increasing the cost of acquiring the land.
<2> Due to the setback of the wall panels, the space filled with air mortar expands to both sides in the width direction of the bridge, so the amount of air mortar filled becomes excessive and the material cost increases.
<3> Large heavy machinery is required to penetrate the H steel, which increases construction costs and requires securing land for installing the heavy machinery.
<4> If the H steel is not sufficiently embedded, lateral pressure will be applied to the back side of the wall panel due to filling with air mortar, and there is a possibility that the wall panel will bulge out to the front side.
本発明の目的は、以上のような従来技術の課題を解決するための橋梁の更新方法を提供することにある。 An object of the present invention is to provide a bridge renewal method for solving the problems of the prior art as described above.
本発明の橋梁の更新方法は、橋梁の床板下部の地盤に基礎コンクリートを構築する、基礎工程と、基礎コンクリート上に鋼枠体を配置する、配置工程と、鋼枠体の枠間に壁面材を付設して壁部を構築し、床板の下部に壁部で遮蔽した充填空間を画設する、遮蔽工程と、充填空間内に固化材を充填する、充填工程と、を備え、橋梁の平面視において、鋼枠体全体を床板の幅方向内側に配置したことを特徴とする。 The bridge renewal method of the present invention includes a foundation step in which foundation concrete is constructed on the ground below the deck of the bridge, a placement step in which a steel frame is placed on the foundation concrete, and a wall material between the steel frames. A shielding process in which a wall is constructed by attaching a wall and a filling space shielded by the wall is defined at the bottom of the floor plate, and a filling process in which a solidifying material is filled in the filling space, and the planar surface of the bridge is As seen, the entire steel frame is located inside the floorboard in the width direction.
本発明の橋梁の更新方法は、鋼枠体が、複数の形鋼を枠状に組んでなる、上部鋼枠体と、複数の形鋼を枠状に組んでなる、下部鋼枠体と、を備え、配置工程において、基礎コンクリート上に下部鋼枠体を配置し、下部鋼枠体上に上部鋼枠体を積載してもよい。 In the bridge renewal method of the present invention, the steel frame includes an upper steel frame body formed by assembling a plurality of shaped steels in a frame shape, a lower steel frame body formed by assembling a plurality of shaped steels in a frame shape, In the placement step, the lower steel frame may be placed on the foundation concrete, and the upper steel frame may be loaded on the lower steel frame.
本発明の橋梁の更新方法は、上部鋼枠体が、水平方向の形鋼に垂直方向の形鋼をピン接合してなるヒンジ構造を備えていてもよい。 In the bridge renewal method of the present invention, the upper steel frame may include a hinge structure in which a vertical section steel is pin-joined to a horizontal section steel.
本発明の橋梁の更新方法は、配置工程において、複数の形鋼同士を複数の支保工で連結して補強してもよい。 In the bridge renewal method of the present invention, a plurality of sections may be reinforced by connecting them with a plurality of supports in the arrangement step.
本発明の橋梁の更新方法は、基礎工程において、基礎コンクリート内にアンカーボルトを埋設し、配置工程において、鋼枠体の下部をアンカーボルトの上部と連結してもよい。 In the bridge renewal method of the present invention, anchor bolts may be buried in the foundation concrete in the foundation step, and the lower part of the steel frame body may be connected to the upper part of the anchor bolt in the placement step.
本発明の橋梁の更新方法は、遮蔽工程において、壁面材の充填空間側に、固化材と定着するための補強材を付設してもよい。 In the bridge renewal method of the present invention, a reinforcing material for fixing with the solidifying material may be attached to the filling space side of the wall material in the shielding step.
本発明の橋梁の更新方法は、固化材が、セメント系の充填材と、発泡材と、を含み、充填工程において、基礎コンクリート上に充填材を充填し、充填材と床板の間に発泡材を充填してもよい。 In the bridge renewal method of the present invention, the solidifying material includes a cement-based filler and a foam material, and in the filling step, the filler is filled on the foundation concrete, and the foam material is placed between the filler and the floorboard. May be filled.
本発明の橋梁の更新方法は、以下の効果の内少なくとも1つを備える。
<1>支柱を用いず、壁面材を基礎コンクリート上に配置した鋼枠体で支持する構造であるため、壁面材を床板の直下に配列することができる。このため、セットバック用の用地取得が不要である。
<2>固化材の充填空間を床板下に収められるため、固化材の充填量を適正量に抑えることができる。
<3>支柱貫入用の大型重機が不要であるため、施工コストが比較的安価で、狭隘な山間や住宅部でも容易に施工することができる。
<4>橋梁両側面の壁面材を鋼枠体で連結する構造であるため、固化材の充填による側圧を相殺して孕み出しを防止することができる。
The bridge renewal method of the present invention has at least one of the following effects.
<1> Since the structure is such that the wall materials are supported by a steel frame placed on the foundation concrete without using supports, the wall materials can be arranged directly below the floorboards. Therefore, there is no need to acquire land for setback.
<2> Since the space for filling the solidifying material can be accommodated under the floorboard, the amount of filling of the solidifying material can be suppressed to an appropriate amount.
<3> Since there is no need for large heavy machinery to penetrate the pillars, the construction cost is relatively low and it can be easily constructed even in narrow mountain areas and residential areas.
<4> Since the structure is such that the wall materials on both sides of the bridge are connected by a steel frame, it is possible to offset the lateral pressure caused by filling the solidifying material and prevent oozing out.
以下、図面を参照しながら本発明の橋梁の更新方法について詳細に説明する。
なお、本発明において「橋梁の更新」とは、既設橋梁の床板下の空間を壁部で閉鎖し、内部に固化材を充填することで、新たに盛土構造物を構築する作業を意味する。
Hereinafter, the bridge updating method of the present invention will be explained in detail with reference to the drawings.
In the present invention, "bridge renewal" refers to the work of constructing a new embankment structure by closing the space under the floorboard of an existing bridge with a wall and filling the inside with solidifying material.
[橋梁の更新方法]
<1>全体の構成(図1)
橋梁の更新方法は、既設の橋梁10を更新して盛土構造物1を構築する方法である。
橋梁の更新方法は、基礎工程S1と、配置工程S2と、遮蔽工程S3と、充填工程S4と、を少なくとも備える。
本例では、橋梁10の床板12下部において、隣り合う2つの橋脚11の間の1スパンを施工する例について説明する。橋梁10の端部では橋台と橋脚11の間を施工する。同様の作業を橋梁10の全長にわたって施工することで、橋梁10全体を盛土構造物1に構築することができる。
なお、橋梁10の下方に通路や水路を残す場合には、通路や水路以外の部分のみを施工することで、盛土構造物1を構築できる。
橋梁の更新方法は、予め枠状に組んだ鋼枠体31を橋梁10の床板12下に配置し(配置工程S2)、鋼枠体31に壁面材32を付設することで橋梁10の下部に充填空間Aを画設する(遮蔽工程S3)構成に1つの特徴を有する。
[How to update bridges]
<1> Overall configuration (Figure 1)
The bridge updating method is a method of updating the existing bridge 10 and constructing the embankment structure 1.
The bridge updating method includes at least a foundation process S1, a placement process S2, a shielding process S3, and a filling process S4.
In this example, an example will be described in which one span is constructed between two adjacent piers 11 at the lower part of the floor plate 12 of the bridge 10. At the end of the bridge 10, construction is performed between the abutments and piers 11. By performing similar work over the entire length of the bridge 10, the entire bridge 10 can be constructed as the embankment structure 1.
In addition, when leaving a passage or a waterway below the bridge 10, the embankment structure 1 can be constructed by constructing only the portion other than the passage or waterway.
The method for updating a bridge is to place a steel frame 31 assembled in advance into a frame shape under the floorboard 12 of the bridge 10 (placement step S2), and attach wall materials 32 to the steel frame 31 to install the steel frame 31 at the bottom of the bridge 10. One feature lies in the configuration of defining the filling space A (shielding step S3).
<1.1>橋梁
橋梁10は、既設の土木構造物である。
橋梁10は、橋脚11と、床板12と、を少なくとも備える。
本例では、橋梁10が複数のI桁からなる桁橋構造の道路橋である例について説明する。ただしこれに限らず、橋梁10の用途は、鉄道橋又は人道橋等であってもよい。また橋梁10の構造は、ラーメン橋、トラス橋又はアーチ橋等であってもよく、桁の構造は、T桁又は箱桁等であってもよい。
<1.1> Bridge Bridge 10 is an existing civil engineering structure.
The bridge 10 includes at least piers 11 and floor plates 12.
In this example, an example will be described in which the bridge 10 is a road bridge with a girder bridge structure consisting of a plurality of I-girders. However, the purpose of the bridge 10 is not limited to this, and the purpose of the bridge 10 may be a railway bridge, a pedestrian bridge, or the like. Further, the structure of the bridge 10 may be a rigid frame bridge, a truss bridge, an arch bridge, or the like, and the structure of the girder may be a T girder, a box girder, or the like.
<2>基礎工程(図2)
基礎工程S1は、床板12下部の地盤に基礎コンクリート21を構築する工程である。
床板12直下の地盤を所定深さに掘削し、砕石の敷設、転圧、捨てコンクリートの打設、型枠の設置、鉄筋の配筋、等の作業を経て、掘削部内に基礎コンクリート21を打設する。
本例では基礎コンクリート21内に複数のアンカーボルト22を埋設し、アンカーボルト22の頭部を基礎コンクリート21から上方に突出させる。
<2> Basic process (Figure 2)
The foundation step S1 is a step of constructing the foundation concrete 21 on the ground below the floorboard 12.
The ground directly below the floorboard 12 is excavated to a predetermined depth, and the foundation concrete 21 is poured into the excavated area after performing work such as laying crushed stone, compaction, pouring concrete, installing formwork, and arranging reinforcing bars. Set up
In this example, a plurality of anchor bolts 22 are buried in the foundation concrete 21, and the heads of the anchor bolts 22 are made to protrude upward from the foundation concrete 21.
<3>壁部(図3)
壁部30は、橋梁10の幅方向両側を遮蔽して、床板12下に充填空間Aを画設する構造体である。
壁部30は、鋼枠体31と、鋼枠体31の前面又は鋼枠体31の枠内に付設した複数の壁面材32と、を備える。
<3> Wall (Figure 3)
The wall portion 30 is a structure that shields both sides of the bridge 10 in the width direction and defines a filling space A under the floorboard 12.
The wall portion 30 includes a steel frame 31 and a plurality of wall members 32 attached to the front surface of the steel frame 31 or within the frame of the steel frame 31.
<3.1>鋼枠体(図3)
鋼枠体31は、壁面材32を支持する枠体である。
本例では鋼枠体31が、上部鋼枠体31a下部鋼枠体31bの組合せからなる。
上部鋼枠体31a及び下部鋼枠体31bは、複数の形鋼Bを水平方向及び垂直方向に組んでなる。すなわち、形鋼Bからなる複数の梁材B1と、形鋼Bからなる複数の桁材B2と、形鋼Bからなる複数の支柱B3を枠状に連結して構成する。
上部鋼枠体31aは、水平方向の形鋼B(梁材B1又は桁材B2)に垂直方向の形鋼B(支柱B3)をピン接合してなる、ヒンジ構造Cを備える。
<3.1> Steel frame (Figure 3)
The steel frame 31 is a frame that supports the wall material 32.
In this example, the steel frame 31 is composed of a combination of an upper steel frame 31a and a lower steel frame 31b.
The upper steel frame 31a and the lower steel frame 31b are formed by assembling a plurality of section steels B in the horizontal and vertical directions. That is, a plurality of beam members B1 made of section steel B, a plurality of girder members B2 made of section steel B, and a plurality of columns B3 made of section steel B are connected in a frame shape.
The upper steel frame 31a includes a hinge structure C in which a vertical shaped steel B (post B3) is pin-joined to a horizontal shaped steel B (beam member B1 or beam member B2).
<3.2>壁面材(図3)
壁面材32は、鋼枠体31の側面を遮蔽する面材である。
本例では壁面材32として、コンクリート製の壁面パネルを採用する。
本例では、壁面材32の背面に、鋼枠体31と連結するためのインサートを埋設する。
また、壁面材32の背面には、固化材40内に定着するための補強材(不図示)を付設することができる。補強材は、例えば異形鉄筋の一端にボルト留めしたプレートであり、異形鉄筋の他端を壁面材32背面のインサートに螺着することで、壁面材32に固定することができる。
<3.2> Wall material (Figure 3)
The wall material 32 is a surface material that shields the side surface of the steel frame 31.
In this example, a concrete wall panel is used as the wall material 32.
In this example, an insert for connecting to the steel frame 31 is embedded in the back surface of the wall material 32.
Further, a reinforcing material (not shown) for fixing in the solidifying material 40 can be attached to the back surface of the wall material 32. The reinforcing material is, for example, a plate bolted to one end of a deformed reinforcing bar, and can be fixed to the wall material 32 by screwing the other end of the deformed reinforcing bar to an insert on the back surface of the wall material 32.
<4>配置工程
配置工程S2は、基礎コンクリート21上に鋼枠体31を配置する工程である。
鋼枠体31は、橋梁10下部の内側に収容する。すなわち橋梁10の平面視において、鋼枠体31全体を床板12の幅方向内側に配置する。
本例では、配置工程S2を、下部鋼枠体31bの設置と上部鋼枠体31aの積載の2段階で実施する。
<4> Placement Step The placement step S2 is a step of placing the steel frame 31 on the foundation concrete 21.
The steel frame body 31 is housed inside the lower part of the bridge 10. That is, in a plan view of the bridge 10, the entire steel frame 31 is arranged inside the floorboard 12 in the width direction.
In this example, the arrangement step S2 is performed in two stages: installation of the lower steel frame 31b and loading of the upper steel frame 31a.
<4.1>下部鋼枠体の配置(図4)
基礎コンクリート21上に下部鋼枠体31bを設置する。詳細には、クレーンで下部鋼枠体31bを床板12下に吊り込んで、基礎コンクリート21上に設置する。または、下部鋼枠体31bをレール上で横引きする方法によって配置してもよい。
設置後、下部鋼枠体31b下部の桁材B2を、基礎部20のアンカーボルト22にボルト連結し、梁材B1又は桁材B2と支柱B3を支保工33で連結して補強する。
<4.1> Layout of lower steel frame (Figure 4)
The lower steel frame 31b is installed on the foundation concrete 21. Specifically, the lower steel frame 31b is lifted under the floorboard 12 by a crane and installed on the foundation concrete 21. Alternatively, the lower steel frame 31b may be placed by pulling it horizontally on a rail.
After installation, the girder B2 at the bottom of the lower steel frame 31b is bolted to the anchor bolts 22 of the foundation 20, and the beam B1 or the girder B2 and the support column B3 are connected and reinforced by the shoring 33.
<4.2>上部鋼枠体の配置(図5)
続いて、下部鋼枠体31b上に上部鋼枠体31aを積載する。詳細には、クレーンで上部鋼枠体31aを床板12下に吊り込んで、下部鋼枠体31b上に設置する。
本例では、上部鋼枠体31a吊り込みの際、支柱B3をヒンジ構造Cによって水平方向に展開した状態で、下部鋼枠体31b上に設置する。これによって、床板12下の狭隘な空間に、上部鋼枠体31aを容易に吊り込むことができる。
設置後、支柱B3を垂直方向に起こし、支柱B3を支保工33で梁材B1又は桁材B2に連結して固定する。併せて、上部鋼枠体31a下部の桁材B2を、下部鋼枠体31b上部の桁材B2にボルト連結する。
<4.2> Arrangement of upper steel frame (Fig. 5)
Subsequently, the upper steel frame 31a is loaded on the lower steel frame 31b. Specifically, the upper steel frame 31a is lifted under the floorboard 12 by a crane and installed on the lower steel frame 31b.
In this example, when the upper steel frame 31a is suspended, the support column B3 is installed on the lower steel frame 31b in a state in which it is expanded horizontally by the hinge structure C. Thereby, the upper steel frame 31a can be easily suspended into the narrow space below the floorboard 12.
After installation, the support column B3 is raised vertically, and the support column B3 is connected and fixed to the beam member B1 or the girder member B2 using the support 33. At the same time, the girder material B2 at the lower part of the upper steel frame 31a is connected by bolts to the girder material B2 at the upper part of the lower steel frame 31b.
<5>遮蔽工程(図6)
遮蔽工程S3は、床板12の幅方向両側を壁部30で遮蔽して、内部に充填空間Aを画設する工程である。
鋼枠体31(上部鋼枠体31a及び下部鋼枠体31b)の隣り合う支柱B3間を遮蔽するように、支柱B3に壁面材32を付設する。詳細には、例えば壁面材32背面のインサートに金具を固定し、壁面材32背面の金具を支柱B3のフランジに係止して固定する。
なお、本例では橋脚11の側方に隙間があるため、鋼枠体31における橋脚11側の側面も一部壁面材32で遮蔽している。
鋼枠体31の全ての枠内を壁面材32で遮蔽することで、床板12の下部に、壁部30による充填空間Aを画設する。ただし、充填空間Aは完全な密封空間に限らず、例えば固化材40の充填のために壁部30の上方に開口を設けてもよい。
<5> Shielding process (Figure 6)
The shielding step S3 is a step of shielding both sides of the floorboard 12 in the width direction with the walls 30 to define a filling space A therein.
A wall material 32 is attached to the support column B3 so as to shield between adjacent support columns B3 of the steel frame body 31 (upper steel frame body 31a and lower steel frame body 31b). Specifically, for example, a metal fitting is fixed to an insert on the back side of the wall material 32, and the metal fitting on the back side of the wall material 32 is locked and fixed to a flange of the support column B3.
In this example, since there is a gap on the side of the pier 11, a portion of the side surface of the steel frame 31 on the pier 11 side is also covered by the wall material 32.
By shielding the entire frame of the steel frame 31 with the wall material 32, a filling space A is defined by the wall portion 30 at the lower part of the floor plate 12. However, the filling space A is not limited to a completely sealed space, and an opening may be provided above the wall portion 30 for filling the solidifying material 40, for example.
<6>充填工程(図7)
充填工程S4は、充填空間A内に固化材40を充填する工程である。
本例では、固化材40として、セメント系の充填材41と発泡材42を組み合わせて使用する。ただしこれに限らず、例えば固化材40を発泡材42のみによって構成してもよい。
本例では充填材41としてエアモルタルを、発泡材42として発泡ウレタンを、それぞれ採用する。この他、EPSブロックなどを併用してもよい。
床板12又は壁部30の上方に設けた開口から充填空間A内に圧送管を挿入し、基礎コンクリート21上に充填材41を充填する。
所定高さまで充填材41を充填後、充填材41の上部と床板12の間に発泡材42を吹付ける。発泡材42は、吹付けと同時に膨張して床板12の下部に密着する。
本例では、エアモルタルと発泡ウレタンが極めて軽量であるため、充填空間A下部の支持力を高めるための地盤改良が必要なく、地盤改良コストを節減することができる。また、エアモルタルと発泡ウレタンが軽量であるため、充填による壁面材32の外側への孕み出しを抑止することができる。
<6> Filling process (Figure 7)
The filling step S4 is a step of filling the filling space A with the solidifying material 40.
In this example, a cement-based filler 41 and a foam material 42 are used in combination as the solidifying material 40. However, the present invention is not limited to this, and for example, the solidifying material 40 may be composed of only the foaming material 42.
In this example, air mortar is used as the filler 41, and urethane foam is used as the foaming material 42. In addition to this, an EPS block or the like may be used in combination.
A pressure feed pipe is inserted into the filling space A through an opening provided above the floor plate 12 or the wall portion 30, and the filling material 41 is filled onto the foundation concrete 21.
After filling the filler 41 to a predetermined height, a foam material 42 is sprayed between the upper part of the filler 41 and the floorboard 12. The foam material 42 expands at the same time as it is sprayed and comes into close contact with the lower part of the floorboard 12.
In this example, since the air mortar and foamed urethane are extremely lightweight, there is no need for ground improvement to increase the supporting capacity of the lower part of the filling space A, and the cost for ground improvement can be reduced. Furthermore, since the air mortar and the urethane foam are lightweight, it is possible to prevent the wall material 32 from protruding outward due to filling.
<7>盛土構造物(図8)
充填空間A内の充填材41と発泡材42が固化することで、橋梁10と、鋼枠体31と、壁面材32と、が固化材40により一体化した、盛土構造物1が構築される。
盛土構造物1は、橋梁10の全体の荷重を、橋脚11や橋台ではなく固結材40によって支持する構造である。従って、橋脚11や橋台の健全性を問わず、床版11の自重、通行車両の活荷重、降雪の死荷重、及び地震時の水平荷重を、固結材40のみによって負担することができる。
また、固化材40が、橋脚11の表面や床板12の底面に密着することで、外部からの化学的影響を遮断して、床板12や橋脚11の劣化の進行を抑制することができる。
<7> Embankment structure (Figure 8)
By solidifying the filling material 41 and foam material 42 in the filling space A, an embankment structure 1 is constructed in which the bridge 10, the steel frame 31, and the wall material 32 are integrated by the solidifying material 40. .
The embankment structure 1 has a structure in which the entire load of the bridge 10 is supported by the consolidation material 40 rather than by the piers 11 or abutments. Therefore, regardless of the soundness of the piers 11 and abutments, the dead weight of the deck slab 11, the live load of passing vehicles, the dead load of snowfall, and the horizontal load during an earthquake can be borne only by the consolidation material 40.
In addition, since the solidifying material 40 is in close contact with the surface of the pier 11 and the bottom of the floorboard 12, it is possible to block chemical influences from the outside and suppress the progress of deterioration of the floorboard 12 and the pier 11.
[片桟道橋形式の実施例]
本発明の橋梁の更新方法は、橋梁10の幅方向片側が、傾斜面Dに塞がれている「片桟道橋」にも適用することができる(図9)。
本例の場合、遮蔽工程S3において、床板12下部の開放側を壁面材32で遮蔽し、反対側は傾斜面Dで遮蔽することで、充填空間Aを画設する。
その他の工程は実施例1と同様なのでここでは詳述しない。
[Example of one-way bridge type]
The bridge renewal method of the present invention can also be applied to a "single pier bridge" in which one side in the width direction of the bridge 10 is closed by the slope D (FIG. 9).
In the case of this example, in the shielding step S3, the open side of the lower part of the floorboard 12 is shielded with the wall material 32, and the opposite side is shielded with the slope D, thereby defining the filling space A.
The other steps are the same as in Example 1, so they will not be described in detail here.
1 盛土構造物
10 橋梁
11 橋脚
12 床板
20 基礎部
21 基礎コンクリート
22 アンカーボルト
30 壁部
31 鋼枠体
31a 上部鋼枠体
31b 下部鋼枠体
32 壁面材
33 支保工
40 固化材
41 充填材
42 発泡材
A 充填空間
B 形鋼
B1 梁材
B2 桁材
B3 支柱
C ヒンジ構造
D 傾斜面
S1 基礎工程
S2 配置工程
S3 遮蔽工程
S4 充填工程
1 Embankment structure 10 Bridge 11 Pier 12 Floor plate 20 Foundation 21 Foundation concrete 22 Anchor bolt 30 Wall 31 Steel frame 31a Upper steel frame 31b Lower steel frame 32 Wall material 33 Shoring 40 Solidifying material 41 Filling material 42 Foaming Material A Filling space B Shaped steel B1 Beam material B2 Girder material B3 Support column C Hinge structure D Inclined surface S1 Foundation process S2 Placement process S3 Shielding process S4 Filling process
Claims (7)
前記基礎コンクリート上に鋼枠体を配置する、配置工程と、
前記鋼枠体の枠間に壁面材を付設して壁部を構築し、前記床板の下部に前記壁部で遮蔽した充填空間を画設する、遮蔽工程と、
前記充填空間内に固化材を充填する、充填工程と、を備え、
前記橋梁の平面視において、前記鋼枠体全体を前記床板の幅方向内側に配置したことを特徴とする、
橋梁の更新方法。 A foundation process in which foundation concrete is constructed on the ground below the bridge deck;
a placement step of placing a steel frame on the foundation concrete;
A shielding step of constructing a wall by attaching a wall material between the frames of the steel frame, and defining a filling space shielded by the wall at the lower part of the floor plate;
A filling step of filling a solidifying material into the filling space,
In a plan view of the bridge, the entire steel frame is disposed inside the floor plate in the width direction,
How to update bridges.
複数の形鋼を枠状に組んでなる、上部鋼枠体と、
複数の形鋼を枠状に組んでなる、下部鋼枠体と、を備え、
前記配置工程において、前記基礎コンクリート上に前記下部鋼枠体を配置し、前記下部鋼枠体上に前記上部鋼枠体を積載することを特徴とする、
請求項1に記載の橋梁の更新方法。 The steel frame body is
an upper steel frame body formed by assembling a plurality of shaped steels into a frame shape;
A lower steel frame body formed by assembling a plurality of shaped steels into a frame shape,
In the placement step, the lower steel frame is placed on the foundation concrete, and the upper steel frame is loaded on the lower steel frame.
The bridge renewal method according to claim 1.
請求項2に記載の橋梁の更新方法。 The upper steel frame is characterized by having a hinge structure formed by pin-joining a vertical section steel to a horizontal section steel,
The bridge renewal method according to claim 2.
請求項2又は3に記載の橋梁の更新方法。 In the arrangement step, the plurality of shaped steels are connected and reinforced with a plurality of shoring structures,
The bridge renewal method according to claim 2 or 3.
前記配置工程において、前記鋼枠体の下部を前記アンカーボルトの上部と連結することを特徴とする、
請求項1に記載の橋梁の更新方法。 In the foundation step, anchor bolts are buried in the foundation concrete,
In the arrangement step, the lower part of the steel frame is connected to the upper part of the anchor bolt,
The bridge renewal method according to claim 1.
請求項1に記載の橋梁の更新方法。 In the shielding step, a reinforcing material for fixing with the solidifying material is attached to the filling space side of the wall material,
The bridge renewal method according to claim 1.
前記充填工程において、前記基礎コンクリート上に前記充填材を充填し、前記充填材と前記床板の間に前記発泡材を充填することを特徴とする、
請求項1に記載の橋梁の更新方法。 The solidifying material includes a cement-based filler and a foaming material,
In the filling step, the filling material is filled on the foundation concrete, and the foaming material is filled between the filling material and the floorboard.
The bridge renewal method according to claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023175945A JP7438441B1 (en) | 2023-10-11 | 2023-10-11 | How to update bridges |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023175945A JP7438441B1 (en) | 2023-10-11 | 2023-10-11 | How to update bridges |
Publications (1)
Publication Number | Publication Date |
---|---|
JP7438441B1 true JP7438441B1 (en) | 2024-02-26 |
Family
ID=90011420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2023175945A Active JP7438441B1 (en) | 2023-10-11 | 2023-10-11 | How to update bridges |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP7438441B1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013237989A (en) | 2012-05-11 | 2013-11-28 | Free Kogyo Kk | Method for restoring bridge |
JP2016196799A (en) | 2015-04-02 | 2016-11-24 | 旭コンクリート工業株式会社 | Bridge reinforcement method |
JP3213990U (en) | 2017-09-29 | 2017-12-14 | 株式会社ジェイエスピー | Bridge reinforcement structure |
-
2023
- 2023-10-11 JP JP2023175945A patent/JP7438441B1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013237989A (en) | 2012-05-11 | 2013-11-28 | Free Kogyo Kk | Method for restoring bridge |
JP2016196799A (en) | 2015-04-02 | 2016-11-24 | 旭コンクリート工業株式会社 | Bridge reinforcement method |
JP3213990U (en) | 2017-09-29 | 2017-12-14 | 株式会社ジェイエスピー | Bridge reinforcement structure |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR101630235B1 (en) | Precast truss wall structure and construction method of underground structure using thereof | |
US20160340855A1 (en) | Modular construction mold apparatus and method for constructing concrete buildings and structures | |
KR20100138122A (en) | Base of arch rigid frame structure including composite covering arch structure and constructing method thereof | |
CN110499779B (en) | Construction method of air duct structure sharing side wall with subway station | |
JPH0532521B2 (en) | ||
JPH11152761A (en) | Underground structure and construction method thereof | |
US6988337B1 (en) | Means and method for constructing a fully precast top arch overfilled system | |
KR20130105147A (en) | The construction method of steel-concrete underpass | |
KR101169460B1 (en) | Box girder inbased footing member to inner box and bridge construction method using the same | |
KR101221970B1 (en) | Construction Method for Basement Structure without Temporary Structure | |
KR101263370B1 (en) | Precast end-block with girder connection member and bridge construction method using ths same | |
JP2019183484A (en) | Bridge repair method | |
KR101206860B1 (en) | Excavation tunnel constructing method using vertical side wall and arch ceiling | |
KR100546432B1 (en) | A arch-shaped composite structure with the precast concrete pannel and the steel frame using the open trench tunnel method, and method for it | |
KR100510092B1 (en) | A one-piece type arch-shaped structure with the precast concrete pannel and the steel frame under the earth, and method for manufacturing it | |
KR100650411B1 (en) | Tunnel cover plate | |
KR101011805B1 (en) | Method of constructing underground structure crossing pile bases in a pile-based ground and underground structure constructed using the same | |
JP2008223291A (en) | Rigid frame bridge formed integrally with revetment and method of constructing same | |
KR101198286B1 (en) | Non-wale strut system for top-down construction and top-down construction method thereby | |
JP7438441B1 (en) | How to update bridges | |
KR100908904B1 (en) | Preflex synthetic arch cover structure of embedded type and constructing method thereof | |
KR102097122B1 (en) | Precast mold for platform on piles system and concrete slab track construction method therewith | |
KR101439400B1 (en) | A hinged base structure of arch-shaped composite structure with the precast concrete pannel and the steel frame using the open trench tunnel and method for constructing arch-shaped open trench tunnel | |
KR101906322B1 (en) | Rahmen bridge allowing longitudinal displacement and construction method therefor | |
JP2004027609A (en) | Construction method for subterranean structure and subterranean structure |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20231219 |
|
A871 | Explanation of circumstances concerning accelerated examination |
Free format text: JAPANESE INTERMEDIATE CODE: A871 Effective date: 20231219 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20240206 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20240213 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 7438441 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |