JP2011012492A - Method for reinforcing abutment and bridge girder - Google Patents
Method for reinforcing abutment and bridge girder Download PDFInfo
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- JP2011012492A JP2011012492A JP2009158849A JP2009158849A JP2011012492A JP 2011012492 A JP2011012492 A JP 2011012492A JP 2009158849 A JP2009158849 A JP 2009158849A JP 2009158849 A JP2009158849 A JP 2009158849A JP 2011012492 A JP2011012492 A JP 2011012492A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 20
- 239000004567 concrete Substances 0.000 claims abstract description 14
- 239000011150 reinforced concrete Substances 0.000 claims description 17
- 238000009412 basement excavation Methods 0.000 claims description 14
- 239000012779 reinforcing material Substances 0.000 claims description 12
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 description 10
- 238000010276 construction Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Abstract
Description
本発明は、橋台と橋桁の補強方法に関するものである。
さらに具体的には、背面を盛土構造として構築してある、鉄道橋梁、道路橋梁を補強する方法に関するものである。
ここで橋梁とは、橋台と橋桁を含んだ意味である。
The present invention relates to a method for reinforcing an abutment and a bridge girder.
More specifically, the present invention relates to a method for reinforcing a railway bridge and a road bridge, which is constructed with a backfill structure.
Here, the term “bridge” includes an abutment and a bridge girder.
背面部を盛土構造とする鉄道橋梁、道路橋梁が多数存在する。
これらの橋台の中には現在の設計基準でみると耐震性について問題のある構造物も存在する。
そうでなくとも、橋台、橋桁の老朽化によって安全性が低下している可能性も考えられる。
そのような橋台、橋桁を補強する工法としては、従来から次のような工法が採用されている。
<1> 鉄道や道路の供用を確保するために仮線を、補修対象の橋梁とは別に構築し、老朽化した橋台、橋桁を撤去して新たに構造物を構築する方法。
<2> 仮線を別途構築し、老朽化した橋台、橋桁を補強する方法。
<3> 橋桁部分のみを夜間工事で取り換え、橋台部分は後に別の工事として補修する方法。
There are a lot of railway bridges and road bridges with a back embankment structure.
Among these abutments, there are also structures that have problems with seismic resistance according to the current design standards.
Even if this is not the case, it is possible that the safety of the abutment and the bridge girder has deteriorated.
As a method for reinforcing such abutments and bridge girders, the following methods have been conventionally employed.
<1> A method for constructing a new structure by constructing a temporary line separately from the bridge to be repaired, and removing the aged abutments and bridge girders in order to ensure the use of railways and roads.
<2> A method to reinforce aged abutments and bridge girders by building a temporary line separately.
<3> A method in which only the bridge girder part is replaced by night work, and the abutment part is repaired later as another work.
前記した従来の橋台と橋桁の補強方法にあっては、次のような問題点がある。
<1> いずれの工法でも鉄道や車両の交通が不可能となってしまう時期が発生して周囲の経済活動に影響を与える。
<2> 仮線を構築するだけで大規模な工事となり、余分な膨大な費用が発生する。
<3> 鉄道の場合には夜間に使用しない状態が生じするが、その時間を利用して補強工事を行う場合にも、工事を短時間に分割して進めなければならず、不経済なものである。
The above-described conventional abutment and bridge girder reinforcement methods have the following problems.
<1> Regardless of the method of construction, there will be times when rail and vehicle traffic will be impossible, affecting the surrounding economic activities.
<2> Construction of a temporary line is a large-scale construction, resulting in an extra huge cost.
<3> In the case of railroads, there is a situation where it is not used at night, but even when reinforcement work is performed using that time, the work must be divided in a short time, which is uneconomical. It is.
上記のような課題を解決するために、本発明の橋台と橋桁の補強方法は、背面に盛土を有する橋台と橋桁の補強方法であって、橋台の側面の盛土を、橋台の両側面に沿って橋桁の軸方向と平行方向に掘削し、掘削した、橋桁の軸方向と直交する方向の壁面に、橋桁の軸方向と平行に棒状補強材を打設し、この棒状補強材に反力を取れる状態で、橋台の両側面に補強コンクリートブロックを打設し、橋台、および橋桁から突設したジベルなどを介して、補強コンクリートブロックと橋台、橋桁を一体に構成する橋台と橋桁の補強方法を特徴としたものである。
また補強コンクリートブロックと橋桁を一体に構成するために、橋台と補強コンクリートブロックとで囲んだ橋桁の周囲の空間にもコンクリート、モルタルなどを打設して、両側の橋台と橋桁をラーメン構造とする橋台と橋桁の補強方法を特徴としたものである。
In order to solve the above-described problems, the abutment and bridge girder reinforcement method of the present invention is a reinforcement method of abutment and bridge girder having embankment on the back, and the embankment on the side surface of the abutment is extended along both sides of the abutment. Drilling in a direction parallel to the axial direction of the bridge girder, a bar-shaped reinforcing material is placed in parallel to the axial direction of the bridge girder on the wall surface in the direction perpendicular to the axial direction of the bridge girder, and a reaction force is applied to this bar-shaped reinforcing material. Reinforced concrete blocks are installed on both sides of the abutment. It is a feature.
In addition, in order to configure the reinforced concrete block and the bridge girder as one body, concrete, mortar, etc. is also placed in the space around the bridge girder surrounded by the abutment and the reinforced concrete block, so that the abutment and the bridge girder on both sides have a ramen structure. It features a method of reinforcing abutments and bridge girders.
本発明の橋台と橋桁の補強方法は以上説明したようになるから次のような効果のいくつかを得ることができる。
<1> 鉄道や道路の通行を確保したまま、仮線を設置することなく橋台と橋桁を補強することができる。
<2> 棒状補強体を設置して橋台を支持するために、その抵抗力によって橋台の地震時の安定性が大幅に向上する。
<3> 単純梁であった橋台と橋桁を一体化したラーメン構造とすれば、橋桁部材の断面力を減少させることができる。
<4> 橋台と橋桁を一体化すれば、橋桁を支持していた支承部が不要となるので、そのメンテナンス費用が不要となり経済的である。
Since the abutment and bridge girder reinforcement method of the present invention is as described above, some of the following effects can be obtained.
<1> Abutments and bridge girders can be reinforced without installing temporary lines while ensuring the passage of railways and roads.
<2> In order to support the abutment by installing the rod-shaped reinforcement body, the stability of the abutment during an earthquake is greatly improved by its resistance.
<3> The cross-sectional force of the bridge girder member can be reduced by adopting a ramen structure in which the abutment and the bridge girder that are simple beams are integrated.
<4> If the abutment and the bridge girder are integrated, the support part supporting the bridge girder is unnecessary, so that the maintenance cost is unnecessary and it is economical.
以下図面を参照にしながら本発明の好適な実施の形態を詳細に説明する。 DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
<1>前提条件。
前記したように、本発明の補強方法の対象は、背面に盛土3を有する橋台1と橋桁2の補強方法である。
橋台1はコンクリート製であるが、橋桁2は鋼製のものも、コンクリート製のものも本発明の補強方法の対象とすることができる。
なお本明細書では、説明の便宜上から、平面視がほぼ矩形の橋台1について、盛土3側を「背面」、橋桁2の下の通路側を「前面」、橋桁2に平行の両側の面を「側面」と称することにする。
<1> Precondition.
As described above, the object of the reinforcing method of the present invention is a reinforcing method of the abutment 1 and the
The abutment 1 is made of concrete, but the
In the present specification, for the convenience of explanation, the abutment 1 having a substantially rectangular plan view has the embankment 3 side as the “rear face”, the passage side under the
<2>盛土の掘削。
橋台1の両側には盛土3や石積みが存在する。
これらを撤去して、橋台1の側面の盛土3、およびそれよりも奥の盛土3の一部を掘削する。
この掘削位置は、鉄道や道路の路盤の外側である。
そのために、列車や車両の通行には影響を与えることはない。
掘削位置は、橋台1の脇の盛土3の状態によって異なるが、橋台1の両側面に沿って橋桁2の軸方向と平行方向に掘削する。(図2)
あるいは橋桁2の軸方向に交わる角度で、斜め方向に掘削する。(図3)
その結果、掘削面は、橋桁2の軸方向と直交する面、あるいは交わる面として形成される。
<2> Excavation excavation.
There are embankments 3 and masonry on both sides of the abutment 1.
These are removed, and the embankment 3 on the side surface of the abutment 1 and a part of the embankment 3 in the back are excavated.
This excavation position is outside the railroad or roadbed.
Therefore, it does not affect the traffic of trains and vehicles.
The excavation position varies depending on the state of the embankment 3 on the side of the abutment 1, but the excavation position is excavated along the both sides of the abutment 1 in a direction parallel to the axial direction of the
Alternatively, excavation is performed in an oblique direction at an angle that intersects the axial direction of the
As a result, the excavation surface is formed as a surface orthogonal to or intersecting with the axial direction of the
<3>棒状補強材の打設。
掘削することによって、橋桁2の軸方向と直交する方向に位置する壁面5を形成することができる。
その壁面5に対して、橋桁2の軸方向と平行に棒状補強材4を打設する。
この棒状補強材4として、たとえば特許第2575329号に記載されたような公知の工法を採用することができる。
この特許工法は、中空回転軸の周囲に掘削翼と攪拌翼とを設けた掘削攪拌ロッドを使用する工法である。
そしてこの掘削攪拌ロッドによって地中に筒状の攪拌土とセメントミルクとの混合体を形成する。
この混合体の中心にはセメントミルクよりなる中央補強体を位置させる。
この中央補強柱の中央には、尾端を孔外に露出させた芯材を位置させてこの芯材を引張り補強体とするものである。
しかしこの工法は一例であり、その他の公知の棒状補強材4を採用することができる。
この棒状補強材4を、複数本、壁面5から橋桁2の軸方向と平行に、壁面5から盛土3内に打設する。(図2)
あるいは、橋桁2の軸方向に対して平行と直交の中間の角度で、棒状補強材4を盛土3内に打設することもできる。(図3)
この打設方向は、通常は掘削して構成した掘削面に直交する角度で削孔して行う。
<3> Placing a rod-shaped reinforcing material.
By excavating, the
A bar-shaped reinforcing
As this rod-shaped reinforcing
This patent method is a method using an excavation stirring rod provided with an excavation blade and a stirring blade around a hollow rotating shaft.
The excavation stirring rod forms a mixture of cylindrical stirring soil and cement milk in the ground.
A central reinforcing body made of cement milk is located at the center of the mixture.
In the center of the central reinforcing column, a core material with the tail end exposed outside the hole is positioned, and this core material is used as a tension reinforcing body.
However, this construction method is an example, and other known rod-shaped reinforcing
A plurality of the bar-shaped reinforcing
Alternatively, the rod-shaped reinforcing
This placing direction is usually performed by drilling at an angle perpendicular to the excavation surface formed by excavation.
<4>補強コンクリートブロックの構築。
棒状補強材4の打設が終わったら、掘削した空間の周囲に型枠を設置してコンクリートを打設して補強コンクリートブロック6を構築する。
その場合に補強コンクリートブロック6は、棒状補強材4に反力を取った状態で構築する。
さらに橋台1と一体化する状態で構築する。
そのために、橋台1からジベルやアンカー筋などを突設し、それを包囲する状態でコンクリートを打設して橋台1、橋桁2と補強コンクリートブロック6との一体化を図る。
この補強コンクリートブロック6は、橋台1の両側面に接しているだけでなく、橋桁2の両側と橋桁2の下側を包囲する状態で構築する。
この補強コンクリートブロック6を、両側の橋台1について同様の工程で構築する。
<4> Construction of reinforced concrete blocks.
When the rod-shaped reinforcing
In that case, the reinforced
Furthermore, it is constructed in a state integrated with the abutment 1.
For this purpose, a gibber, an anchor bar or the like is projected from the abutment 1 and concrete is placed in a state surrounding it, thereby integrating the abutment 1, the
The reinforced
This reinforced
<5>橋桁の一体化。
さらに補強コンクリートブロック6と橋桁2を一体に構成する。
そのために、鋼製橋桁2の場合には橋桁2の側面からジベルなどの係合部材を溶接して突設させる。
コンクリート製橋桁2の場合には、橋桁2の側面に削孔してアンカー筋などの係合部材を打ち込んで突設させる。
そして、橋台1と補強コンクリートブロック6とで囲んだ橋桁2の周囲の空間にもコンクリート、モルタルなどの一体化コンクリート7を打設する。
補強前の橋台1の受け面と橋桁2との間には支承が存在している。
そのために橋台1の受け面と橋桁2の空間があるが、この空間にも一体化コンクリート7を打設して、橋台1と橋桁2の端部を、係合部材を介して全面的に一体化する。
<5> Integration of bridge girders.
Further, the reinforced
Therefore, in the case of the
In the case of the
Then, an integrated concrete 7 such as concrete or mortar is placed in a space around the
There is a support between the receiving surface of the abutment 1 before reinforcement and the
For this purpose, there is a space for the abutment 1 and the
<6>外力への対応。
上記のように、両側の橋台1と、橋台1の間にかけ渡した橋桁2とを全面的に一体化してラーメン構造とする。
支承の機能がなくなることによって、温度低下による橋桁2の収縮によって橋台1が前面側に引き寄せられる力が発生する。
また、温度上昇による橋桁2の膨張によって、橋台1が背面側に押される力が発生する。
しかし、その影響は小さい上に、棒状補強材4が打設してあることによって十分に対応することができる。
<6> Response to external forces.
As described above, the abutment 1 on both sides and the
When the function of the support is lost, a force is generated that draws the abutment 1 toward the front side due to the shrinkage of the
Moreover, the force by which the abutment 1 is pushed to the back side generate | occur | produces by expansion of the
However, the influence is small, and it can be sufficiently dealt with by sticking the rod-shaped reinforcing
1:橋台
2:橋桁
3:盛土
4:棒状補強材
5:壁面
6:補強コンクリートブロック
7:一体化コンクリート
1: Abutment 2: Bridge girder 3: Filling 4: Bar-shaped reinforcing material 5: Wall surface 6: Reinforced concrete block 7: Integrated concrete
Claims (2)
橋台の側面の盛土を、橋台の両側面に沿って、橋桁の軸方向と平行方向に向けて、あるいは交わる方向に向けて掘削し、
掘削した盛土の壁面に直交する方向に棒状補強材を打設し、
この棒状補強材に反力を取る状態で、橋台の両側面に補強コンクリートブロックを打設し、
橋台、および橋桁から突設したジベルやアンカー筋などの係合部材を介して、補強コンクリートブロックと橋台、橋桁を一体に構成した、
橋台と橋桁の補強方法。
A method of reinforcing an abutment and a bridge girder with embankment on the back,
Excavation of the embankment on the side of the abutment along both sides of the abutment, in a direction parallel to the axial direction of the bridge girder, or in a direction intersecting
Placing a bar-shaped reinforcing material in a direction perpendicular to the wall of the excavated embankment,
In a state where reaction force is applied to this bar-shaped reinforcing material, reinforced concrete blocks are placed on both sides of the abutment,
Reinforced concrete block, abutment, and bridge girder are integrated with each other via an abutment and engaging members such as a gibber and anchor bar protruding from the bridge girder.
How to reinforce abutments and bridge girders.
橋台と補強コンクリートブロックとで囲んだ橋桁の周囲の空間にコンクリート、あるいはモルタルを打設して、両側の橋台と橋桁をラーメン構造とする、
請求項1記載の橋台と橋桁の補強方法。 In order to construct a reinforced concrete block and a bridge girder together,
Concrete or mortar is placed in the space around the bridge girder surrounded by the abutment and the reinforced concrete block, and the abutment and the bridge girder on both sides have a ramen structure.
The abutment and bridge girder reinforcing method according to claim 1.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011247059A (en) * | 2010-05-31 | 2011-12-08 | Tokyu Construction Co Ltd | Reinforcement method for bridge abutment and back fill |
JP2017020176A (en) * | 2015-07-07 | 2017-01-26 | 公益財団法人鉄道総合技術研究所 | Abutment reinforcement structure and reinforcing method |
Citations (2)
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JP2004232435A (en) * | 2003-02-03 | 2004-08-19 | Ohbayashi Corp | Reinforcement method of abutment and its reinforced structure |
JP2005068816A (en) * | 2003-08-25 | 2005-03-17 | Railway Technical Res Inst | Construction method for abutment with reconstruction for bridge and its abutment structure |
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2004232435A (en) * | 2003-02-03 | 2004-08-19 | Ohbayashi Corp | Reinforcement method of abutment and its reinforced structure |
JP2005068816A (en) * | 2003-08-25 | 2005-03-17 | Railway Technical Res Inst | Construction method for abutment with reconstruction for bridge and its abutment structure |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011247059A (en) * | 2010-05-31 | 2011-12-08 | Tokyu Construction Co Ltd | Reinforcement method for bridge abutment and back fill |
JP2017020176A (en) * | 2015-07-07 | 2017-01-26 | 公益財団法人鉄道総合技術研究所 | Abutment reinforcement structure and reinforcing method |
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