JP2982648B2 - Seismic isolation device for bridge - Google Patents
Seismic isolation device for bridgeInfo
- Publication number
- JP2982648B2 JP2982648B2 JP7092310A JP9231095A JP2982648B2 JP 2982648 B2 JP2982648 B2 JP 2982648B2 JP 7092310 A JP7092310 A JP 7092310A JP 9231095 A JP9231095 A JP 9231095A JP 2982648 B2 JP2982648 B2 JP 2982648B2
- Authority
- JP
- Japan
- Prior art keywords
- seismic isolation
- bridge axis
- bridge
- steel damper
- direction perpendicular
- 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.)
- Expired - Fee Related
Links
Landscapes
- Bridges Or Land Bridges (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Description
【０００１】[0001]
【産業上の利用分野】新たに建設される橋梁のみなら
ず、既存の橋梁の耐震補強対策として利用できる道路橋
梁の免震装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a seismic isolation device for a road bridge which can be used not only for newly constructed bridges, but also for seismic reinforcement of existing bridges.
【０００２】[0002]
【従来技術と発明が解決しようとする課題】橋梁には、
既に数多くの免震装置が用いられているが、従来のもの
は橋軸方向に免震したものであり、橋軸直角方向には固
定されていた。BACKGROUND OF THE INVENTION Problems to be Solved by the Invention
Many seismic isolation devices have already been used, but the conventional one is seismically isolated in the bridge axis direction and fixed in the direction perpendicular to the bridge axis.
【０００３】橋桁が橋軸に対して直角方向に沓によって
固定されている場合、地震時の橋桁の慣性力は橋脚にそ
のまま伝達される。When the bridge girder is fixed by a shoe in a direction perpendicular to the bridge axis, the inertia force of the bridge girder during an earthquake is transmitted to the pier as it is.
【０００４】橋軸方向には免震化されていても、橋軸に
直角方向に免震化されていなければ、橋軸に直角方向の
地震力による断面力は、非免震橋梁の場合と同じであ
る。都市の高速道路に多い円形或いは正方形の単柱脚で
は、橋軸直角方向の地震力によって発生する断面力は大
きく、耐震設計上厳しいものとなっており、免震化する
ことにより、地震力の軽減を図ろうとするものである。[0004] Even if the bridge is seismically isolated in the direction of the bridge axis, if it is not seismically isolated in the direction perpendicular to the bridge axis, the section force due to the seismic force in the direction perpendicular to the bridge axis is the same as that of a non-seismic bridge. Is the same. In the case of circular or square single column pedestals, which are common on urban highways, the cross-sectional force generated by the seismic force in the direction perpendicular to the bridge axis is large and severe in seismic design, and by seismic isolation, the seismic force is reduced. It is intended to reduce it.
【０００５】しかし、橋軸直角方向を免震化すると、構
造物の振動周期を長周期化するため変位が大きくなり、
橋桁と橋桁の間の遊間が問題となったり、ジョイント構
造が破損したりするため、むやみに橋軸直角方向を免震
化すべきでない。従って、橋脚が損傷を受ける程度以上
の規模の地震力に対してのみ、橋軸直角方向に免震化す
べきである。[0005] However, when the seismic isolation is performed in the direction perpendicular to the bridge axis, the displacement increases because the vibration period of the structure becomes longer.
The gap between the bridge girder becomes a problem, and the joint structure is damaged. Therefore, the seismic isolation should not be made in the direction perpendicular to the bridge axis. Therefore, seismic isolation should be done in the direction perpendicular to the bridge axis only for seismic forces of a magnitude greater than the damage to the pier.
【０００６】従来の免震ゴムだけでは特性に方向性がな
いため、そのまま用いたのでは橋軸方向も橋軸直角方向
も同一に免震化される。[0006] Since the conventional seismic isolation rubber alone has no directionality, if it is used as it is, the seismic isolation will be the same in both the bridge axis direction and the direction perpendicular to the bridge axis.
【０００７】そこで、中小地震に対しては、橋軸方向の
みを、即ち一方向免震とし、橋脚が損傷を受けるような
大地震時には、橋軸、橋軸直角方向の二方向免震となる
ような装置を提供する。[0007] Therefore, in the case of a small or medium-sized earthquake, only the direction of the bridge axis, that is, one-way seismic isolation, is used, and in the case of a large earthquake in which the pier is damaged, two-way seismic isolation in the direction perpendicular to the bridge axis. Such a device is provided.
【０００８】[0008]
【課題を解決するための手段】橋桁と橋脚の間に設けら
れた免震ゴムを挟んで、橋軸に平行に平板型の鋼製ダン
パを設け、該鋼製ダンパの自由端は前記免震ゴムを挟ん
で橋軸に平行に設けたガイドレールに橋軸方向にスライ
ド可能に係着し、中小地震時は前記鋼製ダンパは降伏せ
ず橋軸方向にスライドし、免震ゴムのみが免震効果を発
揮し、大地震時は、前記鋼製ダンパが橋軸直角方向に降
伏して橋軸直角方向にも免震効果を発揮する構造とす
る。[MEANS FOR SOLVING THE PROBLEMS] A device is provided between a bridge girder and a pier.
Across the seismic isolation rubbers, steel damper parallel flat plate type bridge shaft is provided, the free end of the steel-made damper bridge guide rails provided in parallel to the bridge axis across the seismic isolation rubber Sliding in the axial direction
The steel damper surrenders during a small or medium-sized earthquake.
Without slides bridge axis direction, only the seismic isolation rubber exhibits seismic isolation effect, when a large earthquake, the steel damper descending the bridge axis perpendicular <br/> lay to the bridge axis perpendicular to base isolation The structure will be effective.
【０００９】[0009]
【作用】橋軸方向にスライド可能な鋼製ダンパを、免震
ゴムに付加する。中小地震時には、鋼製ダンパは降伏せ
ずに橋軸方向にスライドし、免震ゴムが橋軸方向の免震
装置となる。大地震時には、鋼製ダンパが降伏域に達
し、橋軸直角方向にも免震装置となる。鋼製ダンパの剛
性を変えることにより、橋軸直角方向の免震装置の剛性
を任意の値にすることが出来る。[Function] A steel damper slidable in the bridge axis direction is added to the seismic isolation rubber. In the event of a small or medium-sized earthquake, the steel damper slides in the bridge axis direction without yielding, and the seismic isolation rubber acts as a seismic isolation device in the bridge axis direction. In the event of a major earthquake, the steel damper reaches the yield zone and becomes a seismic isolation device in the direction perpendicular to the bridge axis. By changing the rigidity of the steel damper, the rigidity of the seismic isolation device in the direction perpendicular to the bridge axis can be set to an arbitrary value.
【００１０】[0010]
【実施例】以下図に基づいて本発明の橋梁用二方向免震
装置を説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG.
【００１１】図１は、本発明の一個の免震ゴムの部分の
構成を示し、橋軸に直角方向の断面図である。橋桁１の
上側プレート２と橋脚５の下側プレート４の間に免震ゴ
ム３を挟持する。該免震ゴム３の両側に橋軸に沿ってガ
イドレール６を設ける。ガイドレール６は鋼製ダンパ７
の頭部を抱持し、ガイドレール６の下部から、鋼製ダン
パ７の平板部を突き出し下側プレート４に固着する。FIG. 1 is a sectional view of the structure of one seismic isolation rubber portion of the present invention in a direction perpendicular to a bridge axis. The seismic isolation rubber 3 is held between the upper plate 2 of the bridge girder 1 and the lower plate 4 of the pier 5. Guide rails 6 are provided on both sides of the seismic isolation rubber 3 along the bridge axis. The guide rail 6 is a steel damper 7
Of the steel damper 7 protrudes from the lower part of the guide rail 6 and is fixed to the lower plate 4.
【００１２】図２は図１を橋軸に沿って視た図である。FIG. 2 is a view of FIG. 1 viewed along the bridge axis.
【００１３】橋脚５、即ち下側プレート４に固着された
鋼製ダンパ７は、ガイドレール６の間を橋軸方向にスム
ースに移動することが出来る。又鋼製ダンパ７は橋軸方
向に対しては剛性が大きく、橋軸直角方向には、降伏す
るように設計されている。A steel damper 7 fixed to the pier 5, ie, the lower plate 4, can move smoothly between the guide rails 6 in the bridge axis direction. The steel damper 7 is designed to have high rigidity in the bridge axis direction and to yield in the direction perpendicular to the bridge axis.
【００１４】中小地震の場合、鋼製ダンパ７は橋軸方向
にスライドするのみである。従って免震は橋軸方向のみ
となる。In the case of a small earthquake, the steel damper 7 only slides in the bridge axis direction. Therefore, seismic isolation is only in the bridge axis direction.
【００１５】大地震時に、橋軸直角方向に大きい荷重が
作用すると、鋼製ダンパ７が降伏し、橋軸方向の免震ゴ
ム３の作用と併せて、二方向の免震装置となる。橋軸直
角方向に免震する地震荷重は、鋼製ダンパ７の特性によ
り、任意の値に設定出来る。When a large load acts in the direction perpendicular to the bridge axis during a large earthquake, the steel damper 7 yields, and together with the action of the seismic isolation rubber 3 in the bridge axis direction, a two-way seismic isolation device is obtained. The seismic load seismically isolated in the direction perpendicular to the bridge axis can be set to any value depending on the characteristics of the steel damper 7.
【００１６】又鋼製ダンパ７及びガイドレール６は、上
下震の場合の、免震装置の浮き上がり防止機能も有して
いる。Further, the steel damper 7 and the guide rail 6 also have a function of preventing the seismic isolation device from being lifted in the case of a vertical quake.
【００１７】更に、ガイドレール６の長さは免震装置の
許容変位から決定される。即ち、免震ゴム３の橋軸方向
の変形が、許容変位を超える場合は、ガイドレール６の
端部に鋼製ダンパ７が衝突し、移動制限装置として作用
する。又橋軸直角方向に対しても、鋼製ダンパ７が移動
制限装置の機能を果たす。Further, the length of the guide rail 6 is determined from the allowable displacement of the seismic isolation device. That is, when the deformation of the seismic isolation rubber 3 in the bridge axis direction exceeds the allowable displacement, the steel damper 7 collides with the end of the guide rail 6 and acts as a movement restricting device. The steel damper 7 also functions as a movement restricting device in the direction perpendicular to the bridge axis.
【００１８】ガイドレール６の端部は取り外すことが出
来、一旦降伏した鋼製ダンパ７は容易に交換可能なもの
とする。The end of the guide rail 6 can be removed, and the steel damper 7 once yielded can be easily replaced.
【００１９】[0019]
【発明の効果】従来のように橋梁を、免震ゴムで免震し
ようとすると、橋軸方向及び橋軸直角方向とも同一の免
震効果を得る。しかし免震により変位が大きくなるの
で、橋軸直角方向では橋桁間の遊間が問題となり、むや
みに橋軸直角方向の免震は行えない。本発明では中小地
震時には、橋軸方向のみに免震機能を発揮し、橋脚に損
傷を及ぼすような大地震時には、橋軸方向と橋軸直角方
向にも免震効果を持たせることが出来る。特に免震装置
の特性を、橋軸方向と橋軸直角方向で、異なった値に設
定出来る特徴がある。When a bridge is seismically isolated with a seismic isolation rubber as in the prior art, the same seismic isolation effect is obtained both in the bridge axis direction and in the direction perpendicular to the bridge axis. However, because the displacement increases due to the seismic isolation, the gap between the bridge girders becomes a problem in the direction perpendicular to the bridge axis. According to the present invention, the seismic isolation function can be exerted only in the direction of the bridge axis at the time of a small or medium-sized earthquake, and the seismic isolation effect can be provided in the direction of the bridge axis and the direction perpendicular to the bridge axis during a large earthquake that damages the pier. In particular, there is a feature that the characteristics of the seismic isolation device can be set to different values in the bridge axis direction and in the direction perpendicular to the bridge axis.
【００２０】なお、この免震装置は移動制限機能、浮き
上がり防止機能を持つため、免震装置以外にこれらの機
能を持つ特別な装置を必要としない。従って新設橋梁だ
けでなく、既存の橋梁に対しても沓を交換するだけでよ
いことから、耐震補強対策としても有効である。Since this seismic isolation device has a movement restriction function and a lifting prevention function, no special device having these functions besides the seismic isolation device is required. Therefore, it is only necessary to replace the shoes for an existing bridge as well as a new bridge.
【図１】本発明の一個の免震ゴムの部分の構成を示し、
橋軸に直角方向の断面図である。FIG. 1 shows a configuration of one seismic isolation rubber part of the present invention,
It is sectional drawing of the direction orthogonal to a bridge axis.
【図２】図１を橋軸に沿って視た図である。FIG. 2 is a view of FIG. 1 as viewed along a bridge axis.
１・・・橋桁、２・・・上側プレート、３・・・免震ゴ
ム、４・・・下側プレート、５・・・柱脚、６・・・ガ
イドレール（剛体）、７・・・鋼製ダンパDESCRIPTION OF SYMBOLS 1 ... Bridge girder, 2 ... Upper plate, 3 ... Seismic isolation rubber, 4 ... Lower plate, 5 ... Column base, 6 ... Guide rail (rigid body), 7 ... Steel damper
Claims (1)
に、橋軸に平行に鋼製ダンパを付加し、該鋼製ダンパの
自由端は橋軸に平行に設けたガイドレールに橋軸方向に
スライド可能に係着し、中小地震時は前記鋼製ダンパは
降伏せず橋軸方向にスライドし、免震ゴムのみが免震効
果を発揮し、大地震時は、前記鋼製ダンパが橋軸直角方
向に降伏して橋軸直角方向にも免震効果を発揮してなる
ことを特徴とした橋梁用免震装置。1. A steel damper is added to a seismic isolation rubber provided between a bridge girder and a pier in parallel with a bridge axis .
The free end is in the direction of the bridge axis on a guide rail provided parallel to the bridge axis.
Slidably and engaged, when small and medium-sized earthquake is the steel damper slides in the bridge axis direction without surrender, only seismic isolation rubber were using their seismic isolation effect, when a large earthquake, the steel damper bridge axis Right angle
A seismic isolation device for bridges, characterized by yielding in the direction and exhibiting seismic isolation in the direction perpendicular to the bridge axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7092310A JP2982648B2 (en) | 1995-04-18 | 1995-04-18 | Seismic isolation device for bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7092310A JP2982648B2 (en) | 1995-04-18 | 1995-04-18 | Seismic isolation device for bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08284114A JPH08284114A (en) | 1996-10-29 |
| JP2982648B2 true JP2982648B2 (en) | 1999-11-29 |
Family
ID=14050836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7092310A Expired - Fee Related JP2982648B2 (en) | 1995-04-18 | 1995-04-18 | Seismic isolation device for bridge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2982648B2 (en) |
Cited By (1)
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| KR100731210B1 (en) * | 2005-01-19 | 2007-06-22 | 안숙희 | Earthquake Isolation Bearing for Bridges Using Shape Memory Alloy |
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| KR101503484B1 (en) * | 2013-06-18 | 2015-03-18 | 서일대학교산학협력단 | Earthquake isolation device having anti-bridge and tensile reinforcing |
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-
1995
- 1995-04-18 JP JP7092310A patent/JP2982648B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100731210B1 (en) * | 2005-01-19 | 2007-06-22 | 안숙희 | Earthquake Isolation Bearing for Bridges Using Shape Memory Alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08284114A (en) | 1996-10-29 |
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Legal Events
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| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990824 |
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| LAPS | Cancellation because of no payment of annual fees |