JP3153774B2 - Seismic isolation bearing for bridge - Google Patents
Seismic isolation bearing for bridgeInfo
- Publication number
- JP3153774B2 JP3153774B2 JP30249496A JP30249496A JP3153774B2 JP 3153774 B2 JP3153774 B2 JP 3153774B2 JP 30249496 A JP30249496 A JP 30249496A JP 30249496 A JP30249496 A JP 30249496A JP 3153774 B2 JP3153774 B2 JP 3153774B2
- Authority
- JP
- Japan
- Prior art keywords
- seismic isolation
- bridge
- shoe
- isolation bearing
- superstructure
- 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)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、建造物などの免震
支承に関し、特に橋脚などの比較的小さい面上に載置さ
れ、橋梁本体などの上部工を支承する免震支承に関す
る。中でも本発明は上沓と下沓から成り、それらが互い
に接触して、橋梁上部工荷重を橋脚に伝える橋梁用免震
支承に関する。The present invention relates to a seismic isolation bearing for a building or the like, and more particularly to a seismic isolation bearing mounted on a relatively small surface such as a pier and supporting a superstructure such as a bridge body. In particular, the present invention relates to a seismic isolation bearing for a bridge composed of an upper shoe and a lower shoe, which are in contact with each other and transmit a bridge superstructure load to a pier.
【０００２】[0002]
【従来の技術】橋梁を構築するに当たっては、橋脚上面
と橋梁上部工との間に支承を置いて、上部工の荷重を橋
脚に伝える様にしているが、その支承が適切でないとき
には、地震などの自然災害により橋梁全体が大きな被害
を受ける。そのため、近年では支承を免震支承として建
造物を地震から保護する技術に関し、多くの提案が行わ
れている。2. Description of the Related Art When constructing a bridge, a bearing is placed between the pier upper surface and the bridge superstructure to transmit the load of the superstructure to the pier. The entire bridge is severely damaged by the natural disaster. Therefore, in recent years, many proposals have been made regarding technology for protecting a building from an earthquake by using a bearing as a seismic isolation bearing.
【０００３】その最も典型的なものは、積層ゴムを支承
構造体の全部又は一部に使用しようとするものである
が、ロッキングの問題があり、橋梁の免震支承としては
不適当である。一方、特公平４−６５１９３号公報に
は、一旦地震により移動した橋梁上部工の位置が、重力
によって復元する形式の技術が開示されている。しか
し、この技術によるときは、構造物の地震の上下動によ
る転倒を防止するための引抜防止装置を免震支承本体外
に独立に有するため、橋脚の様な比較的狭い面積しか有
さない支持面の上に載置して上部工を支承するものとし
て不適当である。[0003] The most typical one is to use a laminated rubber for all or a part of a bearing structure, but there is a problem of locking, which is not suitable as a seismic isolation bearing for a bridge. On the other hand, Japanese Patent Publication No. 4-65193 discloses a technique in which the position of a bridge superstructure once moved by an earthquake is restored by gravity. However, when using this technology, since the pull-out prevention device for preventing the structure from falling due to the vertical movement of the earthquake is independently provided outside the seismic isolation bearing main body, the support that has only a relatively small area like a pier It is unsuitable for mounting on a surface to support a superstructure.
【０００４】また、橋梁においては、地震により大きな
上部工の変位が生ずると、隣接する他の橋梁上部工や、
橋台への衝突が生ずるので、地震の際の変位をあまり大
きくならないように押さえるとともに、揺れをできるだ
け早期に減衰させることも必要である。さらに、橋脚上
におかれる免震支承は、建造物の基礎等に置かれる免震
支承と異なり、直接風雨にさらされ、また、塵などが支
承部に入りやすいので、これを防止する必要もある。し
かしながら、これらについては具体的な提案がなされて
いない。In a bridge, when a large displacement of a superstructure occurs due to an earthquake, another superstructure adjacent to the bridge,
Since a collision with the abutment occurs, it is necessary to suppress the displacement during the earthquake so as not to be too large and to attenuate the shaking as early as possible. Furthermore, unlike seismic isolation bearings that are placed on the foundations of buildings, seismic isolation bearings placed on piers are directly exposed to wind and rain, and dust easily enters the bearings. is there. However, no specific proposal has been made for these.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、橋梁の橋脚
上に設置させるのに好適な免震支承を提供し、上記従来
の免震支承に有する問題点を解決することを課題とす
る。即ち、免震支承を小型化（コンパクト化）し、橋脚
上の狭い面積上において有効に作用し、かつ、作業性
（取扱い性）が良いものとすると共に、橋梁上部工の過
大な変位を抑制し、また、地震エネルギーの早期吸収、
減衰を可能にするものである。更に本発明は、風雨、塵
から支承を保護する具体的な機構を提案するものであ
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a seismic isolation bearing suitable for being installed on a pier of a bridge, and to solve the above-mentioned problems of the conventional seismic isolation bearing. In other words, the seismic isolation bearing is reduced in size (compacted), works effectively on a small area on the pier, and has good workability (handlability), and suppresses excessive displacement of the bridge superstructure. And also the early absorption of seismic energy,
It enables attenuation. Further, the present invention proposes a specific mechanism for protecting the bearing from wind, rain, and dust.
【０００６】[0006]
【課題を解決するための手段】上記課題の解決のため
に、本発明は以下の手段を採用する。まず第一に、橋梁
用免震支承を、上沓と下沓から成り、互いに接触面を介
して接触し、橋梁上部工荷重を橋脚に伝える橋梁用免震
支承において、上沓と下沓を、一方を凸面、他方を凹面
とし、かつ互いにスライドできるように構成し、該上沓
と下沓の接触領域を貫いて、上部工固定用ピンとその挿
入孔を配設するとともに、前記上沓と下沓の周辺部に、
上沓と下沓との引抜防止機構を有してなる橋梁用免震支
承とし、免震支承の小型化（コンパクト化、一体化）を
可能にするのである。In order to solve the above problems, the present invention employs the following means. First of all, the seismic isolation bearing for bridges consists of an upper shoe and a lower shoe, which are in contact with each other via the contact surface, and transmit the upper work load of the bridge to the pier. A convex surface on one side, a concave surface on the other side, and slidable with each other, penetrating a contact area between the upper and lower shoes, disposing a pin for fixing an upper work and an insertion hole thereof, and In the periphery of the lower shoe,
This is a seismic isolation bearing for bridges that has a mechanism to prevent the upper and lower shoes from being pulled out, enabling the seismic isolation bearing to be made smaller (compact, integrated).
【０００７】また、上記免震支承において、引抜防止機
構を、可繞性あるワイヤーと、ワイヤーに直結するボル
トと、該ボルトを上下沓に固定するナットとからなり、
かつ前記ボルトの一端はバネを介して上下いずれかの沓
に固定されているものとするものである。さらに、本発
明は、上沓と下沓の間にシール部材を配置する構成をと
り、風雨、塵から支承を保護するものである。さらに本
発明は、前記上沓と下沓を取り囲み、かつ橋梁上部工と
橋脚上面との間にエネルギー吸収部材を配設し、橋梁上
部構造の過大な変位の抑制、地震エネルギーの早期吸収
を図るものとしている。具体的には、その材料として、
降伏点が低く、伸びが大きい軟鋼を用いるものである。In the above-described seismic isolation bearing, the pull-out preventing mechanism comprises a surrounding wire, a bolt directly connected to the wire, and a nut for fixing the bolt to upper and lower shoes.
In addition, one end of the bolt is fixed to one of the upper and lower shoes via a spring. Further, the present invention has a configuration in which a seal member is disposed between the upper and lower shoes to protect the bearing from wind, rain, and dust. Further, the present invention surrounds the upper shoe and the lower shoe, and arranges an energy absorbing member between the bridge superstructure and the pier upper surface, thereby suppressing excessive displacement of the bridge superstructure and early absorbing seismic energy. It is assumed. Specifically, as the material,
Mild steel with low yield point and large elongation is used.
【０００８】本発明の免震支承１の基本構造は、図１に
示す如く、上沓２と下沓３を有し、それらの一方を凹
面、他方を凸面とし、これらを互いに接触させて構成
し、地震の際には相互にスライドする構造を有する。こ
の免震支承１は図２に示すように、橋脚Ｆと上部工Ｕの
間に設置され、地震エネルギーを上部工に対して遮断す
る機能を有する。具体的には、上沓２を凹面を有する様
になし、一方、下沓３は上沓２よりやや小さい曲率半径
を有する凸面を有する様とし、これらが橋梁上部工Ｕの
荷重により面接触して、上部工Ｕの荷重を橋脚Ｆに伝達
するように構成される。これらの上沓２、下沓３の接触
面の曲率は、双方のスライドしやすさ、接触面における
上部工反力等を考慮して定められる。As shown in FIG. 1, the basic structure of the seismic isolation bearing 1 of the present invention comprises an upper shoe 2 and a lower shoe 3, one of which is concave, the other is convex, and these are brought into contact with each other. It has a structure that slides with each other in the event of an earthquake. As shown in FIG. 2, this seismic isolation bearing 1 is installed between the pier F and the superstructure U, and has a function of blocking seismic energy from the superstructure. Specifically, the upper shoe 2 is made to have a concave surface, while the lower shoe 3 is made to have a convex surface having a slightly smaller radius of curvature than the upper shoe 2, and these are brought into surface contact by the load of the bridge superstructure U. Thus, the load of the superstructure U is transmitted to the pier F. The curvature of the contact surface between the upper shoe 2 and the lower shoe 3 is determined in consideration of the ease of sliding of both, the reaction force at the contact surface, and the like.
【０００９】上沓２、下沓３は、通常の支承の様に、十
分な強度を有する鋼材などで、一体に形成されるが、そ
の接触面は、地震エネルギーにより相互に方向を制限さ
れず、スライドする様に仕上げられる。橋梁の場合は、
大地震のときの免震、復元のみを考えればよいので、多
少摩擦抵抗が大きくても防錆処理がされているものであ
れば十分である。なお、本例では上沓２を凹面、下沓３
を凸面を有するものとしたが、その逆の構成をとること
も可能である。また、凸面側は相互のスライドの容易性
を考慮すれば図示するように、橋梁荷重による相互接触
面より少し広い程度のものとするのが良く、凹面側全面
に対応して凸面が存在していなければならない必要はな
い。要は、相互スライドが可能でかつ、容易に上下沓の
係合状態が外れないように構成されていればよい。The upper shoe 2 and the lower shoe 3 are integrally formed of a steel material having sufficient strength as in the case of a normal bearing, but their contact surfaces are not restricted in their directions by seismic energy. , Can be finished to slide. For bridges,
Since it is only necessary to consider seismic isolation and restoration in the event of a large earthquake, even if the frictional resistance is somewhat large, it is sufficient if the rustproofing treatment is applied. In this example, the upper shoe 2 is concave, and the lower shoe 3
Has a convex surface, but the reverse configuration is also possible. Considering the ease of mutual sliding, the convex side is preferably slightly wider than the mutual contact surface due to the bridge load, as shown in the figure, and the convex surface exists corresponding to the entire concave side. You don't have to. In short, it suffices if it is configured such that mutual sliding is possible and the engagement state of the upper and lower shoes is not easily disengaged.
【００１０】上沓２と下沓３の接触部を貫いて、上部工
固定ピン４および該ピンの挿入孔５が配置される。この
ピン４は、橋梁上部工Ｕが、通常の状態においてかかる
力、すなわち、風力あるいは車輌走行によるかかる力
や、軽微な地震によってかかる力によって移動すること
のないよう、上部工Ｕを橋脚Ｆに対して固定する作用を
有すると共に、大地震、例えば震度５を超える地震の際
には、橋梁上部工Ｕから受ける力により破断し、上部工
Ｕと橋脚Ｆとの固定、連結を解除し、上部工Ｕを橋脚Ｆ
に対して自由移動可能ならしめるものである。従って、
ピン４の太さは上記機能を達するようにするべく、地震
加速度と、ピン２の支える上部工Ｕの質量を考慮して定
めればよい。ピンの挿入孔５は、地震により破断された
ピンを新しいピンに交換するためのものであり、更に、
長時間にわたり地震災害がないときには、ピンの点検、
交換を可能にするものである。この挿入孔は、図１に示
すように、上沓を貫き、下沓のピン挿入深さにわたれば
よく、その径はピンとほぼ同径でよい。An upper work fixing pin 4 and an insertion hole 5 for the pin are arranged through a contact portion between the upper shoe 2 and the lower shoe 3. The pin 4 attaches the superstructure U to the pier F so that the bridge superstructure U does not move in a normal state, that is, a force applied by wind or a vehicle, or a force applied by a slight earthquake. In the event of a large earthquake, for example, an earthquake with a seismic intensity of more than 5, it is broken by the force received from the bridge superstructure U, and the fixing and connection between the superstructure U and the pier F are released. Work U to Pier F
It is possible to move freely with respect to. Therefore,
The thickness of the pin 4 may be determined in consideration of the seismic acceleration and the mass of the superstructure U supported by the pin 2 so as to achieve the above function. The pin insertion hole 5 is for replacing a pin broken by an earthquake with a new pin.
When there is no earthquake disaster for a long time, check the pins,
It allows for exchange. This insertion hole may penetrate the upper shoe and extend to the pin insertion depth of the lower shoe as shown in FIG. 1, and the diameter may be substantially the same as the diameter of the pin.
【００１１】本発明においては、上沓２と下沓３の周辺
部に上沓２と下沓３を貫通して、上沓と下沓との引抜防
止機構６が設けられる。この引抜防止機構６は、地震上
下動により上沓２が、上部工Ｕと共にはね上がり、落下
することがないようにし、下沓３および橋脚Ｆの破損を
防止するものである。具体的には、引抜防止機構６は、
図１および図３にＡ部詳細として示すように、上下沓を
可撓性のあるワイヤー７で連結するとともに支持点にバ
ネ８を有せしめ、バネ長をナット９とワイヤーに直結す
るボルト１０の締め付けにより調節して引抜抵抗力を調
節できるよう構成する。また、ワイヤーは、上下沓を貫
通する孔１１を通して設けられるが、上記孔１１とワイ
ヤー７の間には一定のクリアランス１２を有せしめ、い
わゆる遊動孔になっている。これにより、上記引抜防止
の目的が達成さればかりか、バネとクリアランスの相乗
作用により地震時における上沓と下沓の相互スライドが
容易に行われることになる。なお、上記引抜防止機構６
は、上下沓の周辺部に複数個設けるが、免震支承内に収
容されているので、免震支承が全体としてきわめてコン
パクトとなる。In the present invention, a mechanism 6 for preventing the upper and lower shoes from being pulled out is provided around the upper and lower shoes 2 so as to penetrate the upper and lower shoes 2. The pull-out prevention mechanism 6 prevents the upper shoe 2 from jumping up and falling together with the superstructure U due to the earthquake vertical movement, and prevents the lower shoe 3 and the pier F from being damaged. Specifically, the pull-out prevention mechanism 6
As shown in detail in FIG. 1 and FIG. 3 as part A, the upper and lower shoes are connected by a flexible wire 7 and a spring 8 is provided at a support point. The pull-out resistance is adjusted by tightening. Further, the wire is provided through a hole 11 penetrating the upper and lower shoe, and a certain clearance 12 is provided between the hole 11 and the wire 7 to form a so-called floating hole. This not only achieves the purpose of preventing the pull-out, but also facilitates mutual sliding of the upper and lower shoes during an earthquake due to the synergistic action of the spring and the clearance. The pull-out prevention mechanism 6
Are provided in the periphery of the upper and lower shoe, but are accommodated in the seismic isolation bearing, so that the seismic isolation bearing is extremely compact as a whole.
【００１２】図４は、図１のうちＢ部すなわちワイヤー
７の下沓への取付け状態を示す。ここに示されるよう
に、ワイヤー７の一端にボルト１３が直結され、ナット
１４を介して下沓外周部に固定されるようになってい
る。FIG. 4 shows a state where the wire 7 is attached to the lower shoe of FIG. As shown here, a bolt 13 is directly connected to one end of the wire 7, and is fixed to the outer periphery of the lower shoe via a nut 14.
【００１３】本発明の免震支承には、上沓と下沓の接触
領域を風雨などによる腐食から保護し、また、外部から
塵が入ることを防止するため、上沓と下沓の間にシール
が施される。かくすることにより、上沓２と下沓３の間
にスライド性が長時間にわたって維持されるのである。
具体的には、図１に示すように、上下沓の周辺部に積層
ゴムなどのシール部材１５を配置するのである。なお、
シール手段を積層ゴムとすると、地震の際の上沓２と下
沓３の相互運動がシール手段たる積層ゴムによって緩衝
され、振動が減衰する効果もある。しかしながら、シー
ル手段は上記例のような積層ゴムに限るものではなく、
ポリウレタンなどのより柔かい合成樹脂やゴム製のＯリ
ングなどを用いてもよい。In the seismic isolation bearing of the present invention, the contact area between the upper and lower shoes is protected from corrosion by wind and rain and the like, and dust is prevented from entering from the outside. A seal is applied. By doing so, the slidability between the upper shoe 2 and the lower shoe 3 is maintained for a long time.
Specifically, as shown in FIG. 1, a sealing member 15 such as a laminated rubber is disposed around the upper and lower shoe. In addition,
If the sealing means is made of laminated rubber, the mutual movement of the upper shoe 2 and the lower shoe 3 at the time of an earthquake is buffered by the laminated rubber as the sealing means, and there is also an effect of damping vibration. However, the sealing means is not limited to the laminated rubber as in the above example,
A softer synthetic resin such as polyurethane or an O-ring made of rubber may be used.
【００１４】本発明においては、上下沓を囲繞し、か
つ、橋梁上部工と橋脚上面との間にエネルギー吸収部材
を配設するのが良い。これによって、上沓２と下沓３が
地震により大きな相対移動をしようとする際、その範囲
がエネルギー吸収部材の内径及びその変形範囲内に抑え
られ、かつ、地震による加速度による運動エネルギーが
エネルギー吸収部材の変形により吸収緩和される。その
ため、地震波停止後、早期に上部工の揺れを停止に導く
ことができる。In the present invention, it is preferable that an energy absorbing member is disposed between the upper bridge and the upper surface of the pier, surrounding the upper and lower shoes. Thereby, when the upper shoe 2 and the lower shoe 3 make a large relative movement due to the earthquake, the range is suppressed within the inner diameter of the energy absorbing member and its deformation range, and the kinetic energy due to the acceleration due to the earthquake is absorbed by the energy. Absorption is alleviated by deformation of the member. Therefore, after the seismic wave stops, the swing of the superstructure can be led to the stop early.
【００１５】このエネルギー吸収部材１６は、上下沓を
取り囲む円筒状のものでよく、その大きさはその内径が
上下沓の外径に上下沓の相対移動許容量を加算したもの
となっていればよい。その設置は、上下沓（２、３）を
取り囲んでいればよく、上部工Ｕまたは橋脚Ｆに対して
固定する必要はない。しかし、上部工Ｕと橋脚Ｆの間に
押圧状態で配設されれば、先述のシール部材と相まっ
て、あるいはシール部材の機能を代替して、上下沓の接
触面を保護することができる。The energy absorbing member 16 may be a cylindrical member surrounding the upper and lower shoe, and its size is such that its inner diameter is the sum of the outer diameter of the upper and lower shoe and the allowable amount of relative movement of the upper and lower shoe. Good. The installation need only surround the upper and lower shoes (2, 3), and does not need to be fixed to the superstructure U or the pier F. However, if disposed between the superstructure U and the pier F in a pressed state, the contact surfaces of the upper and lower shoe can be protected in combination with the above-described sealing member or by replacing the function of the sealing member.
【００１６】上記エネルギー吸収部材は、地震による橋
梁構造物の運動エネルギーを吸収できるものであれば、
いかなるものでもよいが、特に極軟鋼とするのが好まし
い。極軟鋼は、降伏点が低く、また破断に至るまでに大
きな伸びを有し、衝撃的な外的エネルギーが加わった場
合に変形によって、そのエネルギーを吸収するからであ
る。[0016] The energy absorbing member may be a member capable of absorbing kinetic energy of a bridge structure due to an earthquake.
Any material may be used, but it is particularly preferable to use extremely mild steel. Extremely mild steel has a low yield point and a large elongation before breaking, and when shocking external energy is applied, it absorbs the energy by deformation.
【００１７】[0017]
【実施例】本発明にかかる支承を非弾性バネ系として図
５に示す動的応答解析モデルを作製し、これにより、兵
庫県南部地震の地震波（神戸海洋気象台記録：ＮＳ成
分）による本発明のシミュレーション実験を行った。そ
の結果、免震装置がない場合、高さ２．５ｍの橋梁上端
の変位は、３４．１ｃｍであったが、本発明、免震装置
を設けた場合には１０．６ｃｍと大きく低減されること
が明らかになった。EXAMPLE A dynamic response analysis model shown in FIG. 5 was prepared by using the bearing according to the present invention as an inelastic spring system, whereby the seismic wave of the Hyogoken Nanbu Earthquake (Kobe Ocean Meteorological Observatory record: NS component) was used. A simulation experiment was performed. As a result, when the seismic isolation device was not provided, the displacement of the upper end of the bridge having a height of 2.5 m was 34.1 cm. However, when the present invention and the seismic isolation device were provided, the displacement was greatly reduced to 10.6 cm. It became clear.
【００１８】[0018]
【発明の効果】本発明は、上記の構造をとっているの
で、橋梁用の一体化されたコンパクトな免震支承を提供
することができ、その使用により橋梁の防災を簡易に行
うことができる。又、本発明は、上記に示すとおり、外
気からの防食、防塵機構を有するのでメインテナンスが
容易であり、長期の使用に耐えることができる。Since the present invention has the above-mentioned structure, it is possible to provide an integrated and compact seismic isolation bearing for a bridge, and to use the bridge to easily perform disaster prevention of the bridge. . Further, as described above, the present invention has a mechanism for preventing corrosion from outside air and a dustproof mechanism, so that maintenance is easy and it can withstand long-term use.
【図１】本発明にかかる免震支承の断面図である。FIG. 1 is a sectional view of a seismic isolation bearing according to the present invention.
【図２】本発明免震支承の設置状態を示す断面図であ
る。FIG. 2 is a sectional view showing an installed state of the seismic isolation bearing of the present invention.
【図３】引抜防止機構の上沓への取付状態を示す模式拡
大図である。FIG. 3 is a schematic enlarged view showing a state in which the pullout prevention mechanism is attached to an upper shoe.
【図４】引抜防止機構の下沓への取付状態を示す模式拡
大図である。FIG. 4 is a schematic enlarged view showing a state in which the pullout prevention mechanism is attached to a lower shoe.
【図５】本発明の効果確認のために使用した動的応答解
析モデルの概念図である。FIG. 5 is a conceptual diagram of a dynamic response analysis model used for confirming the effect of the present invention.
１：免震支承 ２：上沓 ３：下沓 ４：上部工固定ピン ５：上部工固定ピン挿入孔 ６：引抜抜き防止機構 ７：ワイヤー ８：バネ ９：ナット １０：ボルト １１：上下沓貫通孔 １２：クリアランス １３：ボルト １４：ナット Ｆ：橋脚 Ｕ：橋梁上部工 1: seismic isolation bearing 2: upper shoe 3: lower shoe 4: superstructure fixing pin 5: superstructure fixing pin insertion hole 6: pull-out prevention mechanism 7: wire 8: spring 9: nut 10: bolt 11: upper and lower shoe penetration Hole 12: Clearance 13: Bolt 14: Nut F: Bridge pier U: Bridge superstructure
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平本 高志 東京都千代田区内幸町２丁目２番３号 川崎製鉄株式会社内 (58)調査した分野(Int.Cl.7，ＤＢ名) E01D 19/04 E01D 19/04 101 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Hiramoto 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (58) Field surveyed (Int. Cl. 7 , DB name) E01D 19 / 04 E01D 19/04 101
Claims (6)
して接触し、橋梁上部工荷重を橋脚に伝える橋梁用免震
支承において、 上沓と下沓を、一方を凸面、他方を凹面とし、かつ互い
にスライドできるように構成し、 該上沓と下沓の接触領域を貫いて、上部工固定用ピンと
その挿入孔を配設するとともに、 前記上沓と下沓の周辺部に、上沓と下沓との引抜防止機
構を有してなる橋梁用免震支承。1. A seismic isolation bearing for a bridge, comprising an upper shoe and a lower shoe, which are in contact with each other via a contact surface and transmit a bridge superstructure load to a pier. With a concave surface and configured to be slidable with each other, a pin for fixing a superstructure and an insertion hole for the pin are provided through the contact area between the upper and lower shoes, and around the upper and lower shoes, A seismic isolation bearing for bridges that has a pull-out prevention mechanism between the upper and lower shoes.
と、ワイヤーに直結するボルトと、該ボルトを上下沓に
固定するナットとからなり、かつ前記ボルトの一端はバ
ネを介して沓に固定されていることを特徴とする請求項
１の橋梁用免震支承。2. The pull-out prevention mechanism comprises a surrounding wire, a bolt directly connected to the wire, and a nut for fixing the bolt to upper and lower shoes, and one end of the bolt is fixed to the shoe via a spring. The seismic isolation bearing for a bridge according to claim 1, wherein the support is provided.
ていることを特徴とする請求項１又は２記載の橋梁用免
震支承。3. The seismic isolation bearing for a bridge according to claim 1, wherein a seal member is disposed between the upper shoe and the lower shoe.
する部材で構成されている請求項３の免震支承。4. The seismic isolation bearing according to claim 3, wherein the seal member is made of a member having an energy absorbing ability.
と橋脚上面との間に配設されるエネルギー吸収部材を有
してなることを特徴とする請求項１、２または３の橋梁
用免震支承。5. The bridge according to claim 1, further comprising an energy absorbing member which surrounds the upper and lower shoes and is disposed between the bridge superstructure and the pier upper surface. For seismic isolation bearings.
いることを特徴とする請求項５の橋梁用免震支承。6. The seismic isolation bearing for a bridge according to claim 5, wherein the shock absorbing member is made of extremely mild steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30249496A JP3153774B2 (en) | 1996-10-28 | 1996-10-28 | Seismic isolation bearing for bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30249496A JP3153774B2 (en) | 1996-10-28 | 1996-10-28 | Seismic isolation bearing for bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10131122A JPH10131122A (en) | 1998-05-19 |
| JP3153774B2 true JP3153774B2 (en) | 2001-04-09 |
Family
ID=17909641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30249496A Expired - Fee Related JP3153774B2 (en) | 1996-10-28 | 1996-10-28 | Seismic isolation bearing for bridge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3153774B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003344550A (en) * | 2002-05-28 | 2003-12-03 | Kajima Corp | System and program for earthquake observation, earthquake analyzer, and recording medium |
| KR100726164B1 (en) | 2006-03-15 | 2007-06-13 | 주식회사 에스코알티에스 | Bridge bearing with elastic materials for resisting negative reactions |
| CN107642031B (en) * | 2017-09-06 | 2019-03-29 | 河海大学 | Friction-type peg shear connector and its construction method |
-
1996
- 1996-10-28 JP JP30249496A patent/JP3153774B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10131122A (en) | 1998-05-19 |
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