JP6359370B2 - Seismic reinforcement device for bridges - Google Patents
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- JP6359370B2 JP6359370B2 JP2014151068A JP2014151068A JP6359370B2 JP 6359370 B2 JP6359370 B2 JP 6359370B2 JP 2014151068 A JP2014151068 A JP 2014151068A JP 2014151068 A JP2014151068 A JP 2014151068A JP 6359370 B2 JP6359370 B2 JP 6359370B2
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- 238000006073 displacement reaction Methods 0.000 claims description 33
- 230000002265 prevention Effects 0.000 description 28
- 230000003014 reinforcing effect Effects 0.000 description 9
- 238000013016 damping Methods 0.000 description 7
- 238000004804 winding Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 229920006231 aramid fiber Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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Description
本発明は、橋梁等の構造物について耐震補強を行うための装置に関する。 The present invention relates to an apparatus for performing seismic reinforcement for structures such as bridges.
大地震に備え、橋梁等の構造物における耐震補強の重要性が高まっている。 In preparation for a major earthquake, the importance of seismic reinforcement in structures such as bridges is increasing.
橋梁の耐震性を高めるために、例えば橋脚に鋼板または繊維シート等を巻いて橋脚自体の強度を高めること（特許文献１、２）、橋桁を橋台にケーブルで連結して落橋を防止すること、桁端部に制震ダンパーを設けることなどの対策がなされている。 In order to increase the earthquake resistance of the bridge, for example, to increase the strength of the pier itself by winding a steel plate or fiber sheet etc. on the pier (Patent Documents 1 and 2), to connect the bridge girder to the abutment with a cable to prevent the falling bridge, Measures such as installing a damping damper at the end of the girder are taken.
図６は、橋脚巻立て補強とともにケーブルなどの落橋防止構造を施す耐震補強の説明図である。 FIG. 6 is an explanatory view of seismic reinforcement for providing a bridge fall prevention structure such as a cable together with bridge pier winding reinforcement.
図７は、ケーブルなどの落橋防止構造とともに制震ダンパーを設ける耐震補強の説明図である。 FIG. 7 is an explanatory diagram of seismic reinforcement that provides a damping damper together with a structure for preventing a fallen bridge such as a cable.
これらの図において、１００は橋台、１０１は橋脚、１０２は橋桁、ｙ１は河川の水面、Ｂはチェーンやケーブルなどの落橋防止構造、ｘ２０は橋脚１０１の巻立て、ｘ２１は橋脚巻立て補強のための仮締切、Ｃは制震ダンパーである。なお、図示は省略しているが、図７においても落橋防止構造Ｂを備えている。 In these drawings, 100 is an abutment, 101 is a bridge pier, 102 is a bridge girder, y1 is a water surface of a river, B is a structure for preventing a falling bridge such as a chain or a cable, x20 is a winding of the bridge pier 101, and x21 is a reinforcement for winding a pier. The temporary deadline, C, is a seismic damper. In addition, although illustration is abbreviate | omitted, the fall-bridge prevention structure B is provided also in FIG.
橋梁の耐震補強構造の中で、橋桁と橋台をケーブルで連結する落橋防止構造Ｂは、ケーブルにより橋桁１０２の重量を支えるのではなく、ケーブルによって地震発生時の水平変位による橋桁１０２の落橋を防止するものである。橋梁の耐震補強構造に使用されるケーブルは、想定される最大の地震時に破断しない程度の伸びおよび強度を有している。 Among the seismic reinforcement structures for bridges, the fall prevention structure B, which connects the bridge girder and abutment with cables, does not support the weight of the bridge girder 102 with cables, but prevents the bridge girder 102 from being dropped due to horizontal displacement when an earthquake occurs. To do. The cable used for the seismic reinforcement structure of the bridge has such an elongation and strength that it does not break at the maximum expected earthquake.
落橋防止構造Ｂは、単に橋桁１０２と橋台１００をケーブルで連結しているだけなので、地震時の橋桁１０２の変位を制限すること及び地震エネルギーの吸収が十分ではなく橋脚１０１に負担が加わる。このため、図６のように橋脚１０１を補強することや、地震エネルギーを吸収し、地震時の変位を制限するための制震ダンパーＣを設けることが行われる。 Since the falling bridge prevention structure B simply connects the bridge girder 102 and the abutment 100 with a cable, the displacement of the bridge girder 102 during an earthquake is limited and the absorption of the seismic energy is not sufficient, and a load is applied to the pier 101. For this reason, as shown in FIG. 6, the pier 101 is reinforced, or the damping damper C for absorbing the seismic energy and limiting the displacement during the earthquake is provided.
図６及び図７の耐震補強には、コストが大きいという問題がある。 6 and 7 has a problem that the cost is high.
図６では、橋脚１０１の補強工事のために仮締切ｘ２１や仮桟橋などの仮設工事が必要となり、このための費用が補強工事全体の大半を占め、この結果コストが大幅に増大する。また、落橋防止構造Ｂの設置スペースに制約があるとともに、その取り付けアンカーは充分な長さをもち、かつ、橋台に確実に固定され容易に抜けないものでなければならず、したがってその削孔が既設鉄筋に干渉するという問題もある。 In FIG. 6, temporary work such as the temporary deadline x21 and the temporary pier is necessary for the reinforcement work of the pier 101, and the cost for this occupies most of the entire reinforcement work, and as a result, the cost is greatly increased. In addition, the installation space of the falling bridge prevention structure B is limited, and the mounting anchor must have a sufficient length and be securely fixed to the abutment so that it cannot be easily removed. There is also a problem of interference with existing reinforcing bars.
図７では、仮設工事は不要であるが、制震ダンパーＣのコストは、落橋防止構造Ｂの何倍にもなり、やはりコストが大幅に増大する。また、落橋防止構造Ｂの設置と同様の問題がある。 In FIG. 7, temporary work is not necessary, but the cost of the damping damper C is many times that of the falling bridge prevention structure B, and the cost is also greatly increased. Moreover, there is a problem similar to the installation of the falling bridge prevention structure B.
本発明は上記課題に鑑みてなされたもので、低コストで施工可能な橋梁の耐震補強装置を提供することを目的とする。 This invention is made | formed in view of the said subject, and it aims at providing the seismic reinforcement apparatus of the bridge which can be constructed at low cost.
この発明は、橋台及び橋桁を備える橋梁の耐震補強装置であって、
前記橋桁の下面に取り付けられる橋桁固定ブラケットと、
前記橋桁固定ブラケットよりも前記橋台側の前記橋桁の下面に取り付けられる偏向ブラケットと、
前記橋桁を支える橋座面とは別の面であって、傾斜している又は垂直の前記橋台の面（以下「前記橋台竪壁前面」）に取り付けられる橋台固定ブラケットと、
それぞれ、前記偏向ブラケットを通り、一端が前記橋桁固定ブラケットに取り付けられ、他端が前記橋台固定ブラケットに取り付けられる第１連結ベルト及び第２連結ベルトとを備えるものである。
This invention is a seismic reinforcement device for a bridge comprising an abutment and a bridge girder,
A bridge girder fixing bracket attached to the lower surface of the bridge girder,
A deflection bracket attached to the lower surface of the bridge girder on the abutment side rather than the bridge girder fixing bracket;
An abutment fixing bracket that is different from the abutment surface that supports the abutment girder and is attached to the inclined or vertical surface of the abutment (hereinafter referred to as “the abutment wall front surface”);
Each includes a first connection belt and a second connection belt that pass through the deflection bracket, one end is attached to the bridge girder fixing bracket, and the other end is attached to the abutment fixing bracket.
例えば、前記第１連結ベルトは、前記橋桁の変位を低減するものであって、前記橋桁固定ブラケットと前記橋台固定ブラケットの間をたるみなく結ぶものであり、
前記第２連結ベルトは、前記橋桁の落下を防止するものであって、前記第１連結ベルトよりも長い。
For example, the first connecting belt is for reducing the displacement of the bridge girder, and ties the bridge girder fixing bracket and the abutment fixing bracket without slack.
The second connection belt prevents the bridge girder from dropping and is longer than the first connection belt.
例えば、前記第１連結ベルトは、前記橋桁の変位を低減するものであって、前記橋桁固定ブラケットと前記橋台固定ブラケットの間をたるみなく結ぶものであり、
前記第２連結ベルトは、前記橋桁の落下を防止するものであって、前記第１連結ベルトよりも強度の大きなもの、及び／又は、前記第１連結ベルトよりも本数が多い。
For example, the first connecting belt is for reducing the displacement of the bridge girder, and ties the bridge girder fixing bracket and the abutment fixing bracket without slack.
The second connection belt prevents the bridge girder from dropping, and has a higher strength than the first connection belt and / or more than the first connection belt.
例えば、前記橋台竪壁前面に取り付けられる板状部材を備え、
前記橋台固定ブラケットは、前記板状部材を介して前記橋台に取り付けられる。
For example, comprising a plate-like member attached to the front surface of the abutment wall,
The abutment fixing bracket is attached to the abutment via the plate-like member.
この発明によれば、制震ダンパーよりも費用のかからない連結ベルトを用いるようにしたので、コストを大幅に低減可能な橋梁の耐震補強装置を提供することができる。 According to the present invention, since the connecting belt which is less expensive than the vibration damper is used, it is possible to provide a bridge earthquake-proof reinforcement device capable of greatly reducing the cost.
発明の実施の形態に係る橋梁の耐震補強装置について、図面を参照して説明を加える。 A bridge earthquake-proof reinforcement device according to an embodiment of the invention will be described with reference to the drawings.
図１は、発明の実施の形態に係る橋梁の耐震補強工事の説明図、図２は、発明の実施の形態に係る橋梁の耐震補強装置の説明図、図３は、図２のＡ−Ａ線矢視断面図である。 FIG. 1 is an explanatory diagram of a seismic reinforcement work for a bridge according to an embodiment of the invention, FIG. 2 is an explanatory diagram of a seismic reinforcement device for a bridge according to an embodiment of the invention, and FIG. FIG.
発明の実施の形態に係る橋梁の耐震補強装置は、既設橋梁の耐震性向上と耐震補強対策時のコスト低減を実現するため、上下部工をアラミド繊維ベルトにより逆L字型に連結したものである。発明の実施の形態に係る橋梁の耐震補強装置は、変位低減装置と落橋防止構造の機能を兼用できるものである。 The seismic reinforcement device for bridges according to the embodiment of the present invention is a structure in which the upper and lower works are connected in an inverted L shape with an aramid fiber belt in order to improve the seismic resistance of existing bridges and reduce the cost when taking seismic reinforcement measures. is there. The seismic reinforcement device for a bridge according to an embodiment of the invention can be used both as a displacement reducing device and a function of preventing a falling bridge.
１は、発明の実施の形態に係る橋梁の耐震補強装置を示す。 1 shows a seismic reinforcement apparatus for a bridge according to an embodiment of the invention.
１１は、橋桁１０２の下面に取り付けられる上部工側ブラケット（橋桁固定ブラケット）である。 Reference numeral 11 denotes an upper work side bracket (bridge girder fixing bracket) attached to the lower surface of the bridge girder 102.
１２は、上部工側ブラケット１１よりも橋台１００側の橋桁１０２の下面に取り付けられる偏向ブラケットである。図の例では、下部工側ブラケット（橋台固定ブラケット）１３の直上に設けられている。 A deflection bracket 12 is attached to the lower surface of the bridge girder 102 on the abutment 100 side of the upper work side bracket 11. In the example of the figure, it is provided directly above the substructure side bracket (abutment fixing bracket) 13.
１３は、橋桁１０２を支える支承部１０３が設けられている橋台１００の面とは別の面であって、傾斜している又は垂直の前記橋台の面（以下「前記橋台竪壁前面」）に取り付けられる橋台固定ブラケットである。図の例では、当該面は垂直である。 13 is a surface different from the surface of the abutment 100 on which the support portion 103 that supports the bridge girder 102 is provided, and is inclined or perpendicular to the surface of the abutment (hereinafter referred to as “the front surface of the abutment wall”). Attached abutment fixing bracket. In the illustrated example, the surface is vertical.
図３に示すように、上部工側ブラケット１１は、桁変位低減ベルト１４及び落橋防止構造ベルト１５が取り付けられるピン２０、ピン２０を支える上部工付きブラケットウエブ２１、上部工側ブラケット１１を橋桁１０２に取り付けるための上部工付きブラケットフランジ２２及び主桁補強ブラケットフランジ２３、上部工付きブラケットフランジ２２と主桁補強ブラケットフランジ２３を橋桁１０２に固定するためのセットボルト２４、主桁補強ブラケットフランジ２３に取り付けられる主桁補強ブラケット２５を備えている。符号２６は、主桁補強ブラケットフランジ２３と主桁補強ブラケット２５の溶接ビードである。 As shown in FIG. 3, the upper work side bracket 11 includes a pin 20 to which the girder displacement reduction belt 14 and the falling bridge prevention structure belt 15 are attached, a bracket web 21 with an upper work that supports the pin 20, and the upper work side bracket 11. The bracket flange 22 with the upper work and the main girder reinforcing bracket flange 23 for mounting to the bridge girder, the set bolt 24 for fixing the bracket flange 22 with the upper work and the main girder reinforcing bracket flange 23 to the bridge girder 102, and the main girder reinforcing bracket flange 23 A main girder reinforcement bracket 25 to be attached is provided. Reference numeral 26 denotes a weld bead of the main girder reinforcing bracket flange 23 and the main girder reinforcing bracket 25.
偏向ブラケット１２の構造は、上部工側ブラケット１１と同じである。下部工側ブラケット１３は、上部工側ブラケット１１から主桁補強ブラケットフランジ２３、主桁補強ブラケット２５などを除いた構造である。 The structure of the deflection bracket 12 is the same as that of the upper work side bracket 11. The lower work side bracket 13 has a structure obtained by removing the main girder reinforcement bracket flange 23, the main girder reinforcement bracket 25, and the like from the upper work side bracket 11.
１４は、偏向ブラケット１２を通り、一端が上部工側ブラケット１１に取り付けられ、他端が下部工側ブラケット１３に取り付けられる桁変位低減ベルト（第１連結ベルト）である。桁変位低減ベルト１４は例えばアラミド繊維製のベルトであり、極めてまれに発生する規模のレベル２地震動に耐えられるものである。 Reference numeral 14 denotes a girder displacement reduction belt (first connecting belt) that passes through the deflection bracket 12 and has one end attached to the upper work side bracket 11 and the other end attached to the lower work side bracket 13. The girder displacement reduction belt 14 is, for example, a belt made of aramid fiber and can withstand level 2 earthquake motion of a scale that occurs extremely rarely.
１５は、偏向ブラケット１２を通り、一端が上部工側ブラケット１１に取り付けられ、他端が下部工側ブラケット１３に取り付けられる落橋防止構造ベルト（第２連結ベルト）である。落橋防止構造ベルト１５は、橋桁１０２に水平に加わる力について、設計力Ｈ＝１．５×Ｒｄで設計される。 Reference numeral 15 denotes a falling bridge prevention structure belt (second connecting belt) that passes through the deflection bracket 12 and has one end attached to the upper work side bracket 11 and the other end attached to the lower work side bracket 13. The falling bridge prevention structure belt 15 is designed with a design force H = 1.5 × Rd with respect to the force applied horizontally to the bridge girder 102.
桁変位低減ベルト１４は、橋桁１０２の変位を低減するものであって、上部工側ブラケット１１と下部工側ブラケット１３の間をたるみなく結んでいる。これに対し、落橋防止構造ベルト１５は、橋桁１０２の落下を防止するものであって、桁変位低減ベルト１４よりも長い。このため、図２に示すように、若干のたるみをもつ。 The girder displacement reduction belt 14 reduces the displacement of the bridge girder 102 and connects the upper work side bracket 11 and the lower work side bracket 13 without slack. On the other hand, the falling bridge prevention structure belt 15 prevents the bridge girder 102 from dropping and is longer than the girder displacement reduction belt 14. For this reason, as shown in FIG. 2, it has some slack.
また、上述のように、落橋防止構造ベルト１５は、桁変位低減ベルト１４よりも強度が大きくなるように設計されている。しかも、図３に示すように、落橋防止構造ベルト１５は、桁変位低減ベルト１４よりも本数が多い（前者は２本、後者は１本）。 Further, as described above, the falling bridge prevention structure belt 15 is designed so as to be stronger than the girder displacement reduction belt 14. Moreover, as shown in FIG. 3, the number of the fallen bridge prevention structure belts 15 is greater than that of the girder displacement reduction belt 14 (the former is two and the latter is one).
以上のことから、桁変位低減ベルト１４が切れたときでも、落橋防止構造ベルト１５は切れないことがある。 From the above, even when the girder displacement reduction belt 14 is cut, the falling bridge prevention structure belt 15 may not be cut.
３０は、橋台１００の垂直面に取り付けられるベースプレート（板状部材）である。ベースプレート３０は、例えば図示のようにＬ字に曲げられた鋼板であり、エポキシ樹脂などにより橋台１００の垂直面に取り付けられる。地震時に橋桁１０２が変位すると、偏向ブラケット１２によりベースプレート３０に上方へ引っ張る力が加わるが、ベースプレート３０全体（特に橋台１００の垂直面に取り付けられている部分）の付着応力度がそれに対抗する。橋台１００への付着に関して、ベースプレート３０の面積は、従来工法の落橋防止構造Ｂや制震ダンパーＣを取り付けるアンカーの面積よりも非常に大きいから、ベースプレート３０がエポキシ樹脂などにより取り付けられ、その単位面積当たりの付着応力度が従来工法のアンカーのそれよりも小さいとしても、ベースプレート３０全体の付着応力度は充分に大きくなる（言い換えれば、付着応力度が充分に大きくなる程度に面積の大きなベースプレート３０が用いられる）。 Reference numeral 30 denotes a base plate (plate member) attached to the vertical surface of the abutment 100. The base plate 30 is a steel plate bent into an L shape as shown in the figure, for example, and is attached to the vertical surface of the abutment 100 by an epoxy resin or the like. When the bridge girder 102 is displaced during an earthquake, a force that pulls upward is applied to the base plate 30 by the deflection bracket 12, but the adhesion stress degree of the entire base plate 30 (particularly, the portion attached to the vertical surface of the abutment 100) counters it. Regarding the adhesion to the abutment 100, the area of the base plate 30 is much larger than the area of the anchor to which the conventional method Brick prevention structure B and damping damper C is attached. Even if the hit adhesion stress is smaller than that of the anchor of the conventional method, the adhesion stress of the entire base plate 30 is sufficiently large (in other words, the base plate 30 having a large area to the extent that the adhesion stress is sufficiently large). Used).
３１は、下部工側ブラケット１３及び／又はベースプレート３０を橋台１００に取り付けるためのアンカーである。地震時に橋桁１０２が変位しても、上述のようにベースプレート３０全体の付着応力度がそれに対抗するとともに、偏向ブラケット１２により力の方向が変えられアンカー３１に引き抜くような力が直接加わらないので（図４及び図５参照）、そのアンカー長（嵌入深さ）は従来よりも短くて済む。このため、鉄筋への干渉という問題が生じない（言い換えれば、アンカー３１の長さは橋台１００内の鉄筋に到達しない程度に短くできる）。 31 is an anchor for attaching the lower work side bracket 13 and / or the base plate 30 to the abutment 100. Even if the bridge girder 102 is displaced at the time of an earthquake, the adhesion stress degree of the entire base plate 30 opposes it as described above, and a force that changes the direction of the force by the deflection bracket 12 and is pulled out to the anchor 31 is not directly applied ( 4 and FIG. 5), the anchor length (insertion depth) may be shorter than the conventional one. For this reason, the problem of interference with the reinforcing bar does not occur (in other words, the length of the anchor 31 can be shortened so as not to reach the reinforcing bar in the abutment 100).
発明の実施の形態に係る耐震補強装置の動作について、図４及び図５を参照して説明を加える。これらの図では橋桁１０２が右方向（橋脚１０１の方向）へ変位しているが、反対方向の変位の場合は反対側の耐震補強装置が作用する。 The operation of the seismic reinforcement apparatus according to the embodiment of the invention will be described with reference to FIGS. In these figures, the bridge girder 102 is displaced in the right direction (the direction of the pier 101). However, in the case of the displacement in the opposite direction, the seismic reinforcement device on the opposite side acts.
図４は、地震発生時において橋桁１０２が右側へ移動した状態を示す。 FIG. 4 shows a state where the bridge girder 102 has moved to the right side when an earthquake occurs.
この状態において、桁変位低減ベルト１４が機能し、橋桁１０２の水平変位を抑制する。 In this state, the girder displacement reduction belt 14 functions to suppress horizontal displacement of the bridge girder 102.
さらに、桁変位低減ベルト１４の張力により、矢印に示すように偏向ブラケット１２に斜め下向きの力Ｆ１が作用するため、支承部（可動支承）１０３を圧着し、これにより増加する摩擦力によって橋桁１０２の移動量が小さくなる（この点は図５でも同じ）。 Further, since the diagonally downward force F1 acts on the deflection bracket 12 as shown by the arrow due to the tension of the girder displacement reduction belt 14, the support portion (movable support) 103 is pressure-bonded and the bridge girder 102 is increased by the friction force increased thereby. (This point is the same in FIG. 5).
桁変位が小さくなるため、橋桁１０２を支持する橋脚１０１の変形も小さくなり、橋脚１０１や支承部１０３の損傷が小さくなる。これに伴い、それらの補強量が減少する。 Since the girder displacement is reduced, the deformation of the pier 101 supporting the bridge girder 102 is also reduced, and damage to the pier 101 and the support portion 103 is reduced. Along with this, the amount of reinforcement decreases.
図４では、落橋防止構造ベルト１５にたるみがある。この状態において落橋防止機能は働いていない。 In FIG. 4, there is a slack in the fallen bridge prevention structure belt 15. In this state, the falling bridge prevention function is not working.
図５は、想定以上の変位が生じて桁変位低減ベルト１４が破断した場合を示す。この状態では、水平変位抑制機能を喪失するが、残存する落橋防止構造ベルト１５が機能して橋桁１０２の落下を防ぐことができる。 FIG. 5 shows a case where the displacement more than expected occurs and the girder displacement reduction belt 14 is broken. In this state, the function of suppressing horizontal displacement is lost, but the remaining falling bridge prevention structure belt 15 functions to prevent the bridge girder 102 from falling.
図５の矢印に示すように、ベースプレート３０に対して主に平行な力（上方の力Ｆ２）が加わり、垂直な力（アンカー３１を引き抜く方向の力Ｆ３）は比較的小さい（この点は図４でも同じ）。ベースプレート３０及びアンカー３１は当該力に対抗することができる。 As shown by the arrows in FIG. 5, a force parallel to the base plate 30 (upward force F2) is applied, and the vertical force (force F3 in the direction of pulling out the anchor 31) is relatively small (this point is shown in FIG. 5). 4 is the same). The base plate 30 and the anchor 31 can counter the force.
また、落橋防止構造ベルト１５が、橋台１００の垂直面に沿って（縦方向）に配置されているため、津波による橋桁１０２の浮き上がりや流出を防止することができる。 Further, since the falling bridge prevention structure belt 15 is disposed along the vertical surface of the abutment 100 (longitudinal direction), the bridge girder 102 can be prevented from being lifted or discharged by the tsunami.
発明の実施の形態によれば、制震ダンパーよりも安価な連結ベルトを用いることにより、大幅なコスト縮減が可能である。また、費用のかかる前記の仮設工事も不要である。 According to the embodiment of the invention, it is possible to significantly reduce the cost by using a connection belt that is cheaper than the vibration damper. In addition, the above-mentioned temporary work which is expensive is unnecessary.
桁変位低減ベルトにより地震時の橋桁の変位を抑制するので、橋脚の補強量を低減できる。 Since the girder displacement reduction belt suppresses the displacement of the bridge girder during an earthquake, the amount of reinforcement of the pier can be reduced.
連結ベルトにはアラミド繊維等の繊維材を用いるため、伸び性能があり、地震に対しても耐衝撃性に優れる。 Since a fiber material such as an aramid fiber is used for the connection belt, it has elongation performance and is excellent in impact resistance against earthquakes.
縦方向に配置されたベルトは、津波による波圧が桁の側面及び／又は底面から作用して桁に上揚力が生じても、落橋防止構造ベルトが抵抗できるため、橋梁上部工の津波流出防止にも効果が期待できる。 The belt arranged in the vertical direction prevents the tsunami from flowing out of the bridge superstructure, because the falling bridge prevention structure belt can resist even if the wave pressure caused by the tsunami acts from the side and / or bottom of the girder and the lifting force is generated on the girder. Can also be expected.
また、発明の実施の形態によれば、強度の異なる２種類の連結ベルトを用いているので、地震時の橋の変位抑制と落橋防止の機能を両方実現できる。すなわち桁変位低減ベルトにより、桁を弾性支持することで地震時の変位を小さくし、橋脚の耐震補強量を低減できるとともに、落橋防止構造ベルトは、設計で想定した以上の過大な変形が生じ、桁変位低減ベルトが破断した後において、落橋防止構造として機能する。 In addition, according to the embodiment of the present invention, since two types of connecting belts having different strengths are used, it is possible to realize both the function of suppressing the displacement of the bridge and preventing the falling bridge during an earthquake. In other words, the girder displacement reduction belt can elastically support the girder to reduce the displacement at the time of earthquake and reduce the amount of seismic reinforcement of the pier, and the falling bridge prevention structure belt is excessively deformed more than assumed in the design, After the girder displacement reduction belt breaks, it functions as a falling bridge prevention structure.
また、偏向ブラケットを備えることにより、その作用力を縦方向（垂直方向、橋台の垂直面に沿った方向）に変えている。発明の実施の形態に係る耐震補強装置においては、アンカーの取り付け方向（アンカー軸方向）と地震時にこれに作用する力の方向が異なるので、その設置を簡易な手段、例えば、下部工側の取付ブラケットはベースプレートを樹脂接着とズレ止めアンカー程度で固定できる。下部工側の取付ブラケットの水平アンカー削孔を省略したアンカーレス構造とすることができる。施工の省力化と既設構造物への影響を最小限にすることができる。これに対し、図６及び図７の落橋防止構造の作用力は横方向（水平方向、橋台の垂直方向）であるから、地震時にアンカーを引き抜くように力が作用する。したがって、その取り付けにコストが嵩むことになる。 Further, by providing the deflection bracket, the acting force is changed in the vertical direction (vertical direction, the direction along the vertical surface of the abutment). In the seismic reinforcement device according to the embodiment of the invention, the installation direction of the anchor (anchor axis direction) and the direction of the force acting on the earthquake are different, so installation is simple means, for example, installation on the substructure side The bracket can fix the base plate with resin adhesion and misalignment anchor. An anchorless structure in which the horizontal anchor drilling of the mounting bracket on the substructure side is omitted can be obtained. Labor saving in construction and impact on existing structures can be minimized. On the other hand, since the acting force of the fallen bridge prevention structure of FIG.6 and FIG.7 is a horizontal direction (horizontal direction, the vertical direction of an abutment), force acts so that an anchor may be pulled out at the time of an earthquake. Therefore, the cost increases for the attachment.
また、発明の実施の形態に係る耐震補強装置は橋座面に設置されることがなく、しかもコンパクトであるため、支承部まわりの点検がしやすいなど橋梁の維持管理性にも優れる。 Moreover, since the seismic reinforcement device according to the embodiment of the present invention is not installed on the bridge seat surface and is compact, it is excellent in bridge maintenance and management such as easy inspection around the bearing portion.
本発明は、以上の実施の形態に限定されることなく、特許請求の範囲に記載された発明の範囲内で、種々の変更が可能であり、それらも本発明の範囲内に包含されるものであることは言うまでもない。 The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.
１ 橋梁の耐震補強装置
１１ 上部工側ブラケット（橋桁固定ブラケット）
１２ 偏向ブラケット
１３ 下部工側ブラケット（橋台固定ブラケット）
１４ 桁変位低減ベルト（第１連結ベルト）
１５ 落橋防止構造ベルト（第２連結ベルト）
３０ ベースプレート（板状部材）
３１ アンカー
１００ 橋台
１０１ 橋脚
１０２ 橋桁
１０３ 支承部
Ｂ 落橋防止構造（チェーン、ケーブル）
Ｃ 制震ダンパー
ｘ２０ 橋脚巻立て補強工
ｘ２１ 仮締切
ｙ１ 水面
1 Seismic reinforcement device for bridge 11 Superstructure side bracket (Bridge girder fixing bracket)
12 Deflection bracket 13 Substructure bracket (Abutment fixing bracket)
14 Girder displacement reduction belt (first connecting belt)
15 Fall bridge prevention belt (second connecting belt)
30 Base plate (plate-like member)
31 Anchor 100 Abutment 101 Bridge pier 102 Bridge girder 103 Bearing part B Fall bridge prevention structure (chain, cable)
C Damping damper x20 Bridge pier winding reinforcement x21 Temporary cutoff y1 Water surface
Claims (3)
前記橋桁の下面に取り付けられる橋桁固定ブラケットと、
前記橋桁固定ブラケットよりも前記橋台側の前記橋桁の下面に取り付けられる偏向ブラケットと、
前記橋桁を支える橋座面とは別の面であって、傾斜している又は垂直の前記橋台の面（以下「前記橋台竪壁前面」）に取り付けられる橋台固定ブラケットと、
それぞれ、前記偏向ブラケットを通り、一端が前記橋桁固定ブラケットに取り付けられ、他端が前記橋台固定ブラケットに取り付けられる第１連結ベルト及び第２連結ベルトとを備え、
前記第１連結ベルトは、前記橋桁の変位を低減するものであって、前記橋桁固定ブラケットと前記橋台固定ブラケットの間をたるみなく結ぶものであり、
前記第２連結ベルトは、前記橋桁の落下を防止するものであって、前記第１連結ベルトよりも長くたるみをもつものであることを特徴とする橋梁の耐震補強装置。 A seismic reinforcement device for bridges with abutments and bridge girders,
A bridge girder fixing bracket attached to the lower surface of the bridge girder,
A deflection bracket attached to the lower surface of the bridge girder on the abutment side rather than the bridge girder fixing bracket;
An abutment fixing bracket that is different from the abutment surface that supports the abutment girder and is attached to the inclined or vertical surface of the abutment (hereinafter referred to as “the abutment wall front surface”);
A first connection belt and a second connection belt each passing through the deflection bracket, having one end attached to the bridge girder fixing bracket and the other end attached to the abutment fixing bracket;
The first connection belt is for reducing the displacement of the bridge girder, and connects the bridge girder fixing bracket and the abutment fixing bracket without slack.
The second connecting belt prevents the bridge girder from dropping, and has a slack longer than the first connecting belt.
前記橋桁の下面に取り付けられる橋桁固定ブラケットと、
前記橋桁固定ブラケットよりも前記橋台側の前記橋桁の下面に取り付けられる偏向ブラケットと、
前記橋桁を支える橋座面とは別の面であって、傾斜している又は垂直の前記橋台の面（以下「前記橋台竪壁前面」）に取り付けられる橋台固定ブラケットと、
それぞれ、前記偏向ブラケットを通り、一端が前記橋桁固定ブラケットに取り付けられ、他端が前記橋台固定ブラケットに取り付けられる第１連結ベルト及び第２連結ベルトとを備え、
前記第１連結ベルトは、前記橋桁の変位を低減するものであって、前記橋桁固定ブラケットと前記橋台固定ブラケットの間をたるみなく結ぶものであり、
前記第２連結ベルトは、前記橋桁の落下を防止するものであって、前記第１連結ベルトよりも強度の大きなもの、及び／又は、前記第１連結ベルトよりも本数が多くたるみをもつものであることを特徴とする橋梁の耐震補強装置。 A seismic reinforcement device for bridges with abutments and bridge girders,
A bridge girder fixing bracket attached to the lower surface of the bridge girder,
A deflection bracket attached to the lower surface of the bridge girder on the abutment side rather than the bridge girder fixing bracket;
An abutment fixing bracket that is different from the abutment surface that supports the abutment girder and is attached to the inclined or vertical surface of the abutment (hereinafter referred to as “the abutment wall front surface”);
A first connection belt and a second connection belt each passing through the deflection bracket, having one end attached to the bridge girder fixing bracket and the other end attached to the abutment fixing bracket;
The first connection belt is for reducing the displacement of the bridge girder, and connects the bridge girder fixing bracket and the abutment fixing bracket without slack.
The second connection belt is for preventing the bridge girder from dropping, and has a strength higher than that of the first connection belt and / or a slack having a larger number than the first connection belt. Retrofit device bridges, characterized in that there.
前記橋台固定ブラケットは、前記板状部材を介して前記橋台に取り付けられることを特徴とする請求項１又は請求項２記載の橋梁の耐震補強装置。 A plate-like member attached to the front surface of the abutment wall,
The abutment fixing bracket, the plate-like member bridges seismic reinforcement device according to claim 1 or claim 2, wherein the attached to the abutment via.
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