JPH10131123A - Preventive device for bridge fall - Google Patents
Preventive device for bridge fallInfo
- Publication number
- JPH10131123A JPH10131123A JP30379996A JP30379996A JPH10131123A JP H10131123 A JPH10131123 A JP H10131123A JP 30379996 A JP30379996 A JP 30379996A JP 30379996 A JP30379996 A JP 30379996A JP H10131123 A JPH10131123 A JP H10131123A
- Authority
- JP
- Japan
- Prior art keywords
- bridge
- cushioning
- prevention device
- girder
- buffer
- 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.)
- Granted
Links
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、地震等の災害時
に橋桁が橋脚や橋台等の下部構造物から落下するのを防
止する落橋防止装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a bridge girder from falling from a substructure such as a pier or an abutment at the time of a disaster such as an earthquake.
【０００２】[0002]
【従来の技術】地震等により橋脚や橋台に水平力が作用
すると、橋脚や橋台の損壊のみならず、それらが振動し
て橋桁が落下すなわち落橋するという被害をもたらす。
従来、落橋防止装置として、橋脚上の桁間や橋台と桁と
をＰＣケーブルにより連結するもの、あるいはリンクに
より連結するものが知られている。しかし、これらの装
置は特に巨大地震の場合、ＰＣケーブルあるいはリンク
と桁との連結部に大きな衝撃力が加わり、連結部で破壊
してしまうという現象を生じている。2. Description of the Related Art When a horizontal force acts on a pier or abutment due to an earthquake or the like, not only the pier or abutment is damaged, but also they vibrate and cause damage such as a drop of the bridge girder, that is, a dropping bridge.
2. Description of the Related Art Conventionally, as a device for preventing a bridge from falling, a device for connecting a girder on a pier or between an abutment and a girder by a PC cable or a device for connecting by a link is known. However, these devices have a phenomenon in which a large impact force is applied to the connection between the PC cable or the link and the girder, especially in the case of a huge earthquake, and the connection is broken at the connection.
【０００３】このため、近年、ＰＣケーブルを用いた落
橋防止装置において、ＰＣケーブルと橋桁とを連結する
ブラケットに、スプリングとゴムとを組合わせた緩衝機
構を取付けたものが種々開発されている。しかし、緩衝
ゴムは単にプレート状のものであるため、衝撃時につぶ
れる率が少ない。すなわち、図７に示すように、衝撃力
とゴムの変位との関係を表すグラフは、立ち上がりの大
きな曲線となる。このため、落橋防止装置のブラケット
やケーブルに大きな衝撃力が加わり、破壊や破断の危険
があった。このような危険を避けるためには、緩衝ゴム
の設計支圧応力を小さくし（１２０Kgf/cm2）、設計荷
重に対するゴムの面積を大きくしなければならない。[0003] For this reason, in recent years, various bridge drop prevention devices using a PC cable have been developed in which a buffer mechanism combining a spring and rubber is attached to a bracket connecting the PC cable and the bridge girder. However, since the cushioning rubber is simply a plate-like material, the cushioning rubber is less likely to be crushed upon impact. That is, as shown in FIG. 7, the graph showing the relationship between the impact force and the displacement of the rubber is a large rising curve. For this reason, a large impact force is applied to the bracket and cable of the bridge prevention device, and there is a risk of breakage or breakage. In order to avoid such a danger, the design bearing stress of the cushioning rubber must be reduced (120 kgf / cm 2 ) and the area of the rubber with respect to the design load must be increased.
【０００４】[0004]
【発明が解決しようとする課題】この発明は上記のよう
な技術的背景に基づいてなされたものであって、次の目
的を達成するものである。SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects.
【０００５】この発明の目的は、緩衝部材の緩衝効果を
高めることにより、安全性の向上を図った落橋防止装置
を提供することにある。[0005] It is an object of the present invention to provide a fall prevention device which improves safety by enhancing a buffer effect of a buffer member.
【０００６】この発明の別の目的は、緩衝部材の設計支
圧応力として大きな値を採用することを可能にし、装置
をコンパクト化して施工性の向上を図った落橋防止装置
を提供することにある。It is another object of the present invention to provide a bridge fall prevention device which enables a large value to be adopted as a design bearing stress of a cushioning member, and which is made compact to improve workability. .
【０００７】[0007]
【課題を解決するための手段】この発明は上記課題を達
成するために、次のような手段を採用している。The present invention employs the following means to achieve the above object.
【０００８】すなわちこの発明は、橋桁の橋軸方向端部
に、一方の端部が取付けられた連結部材により前記橋桁
が橋脚、橋台等の下部構造物から落下するのを防止する
ための落橋防止装置であって、前記橋桁の端部に固定さ
れた筒状部材と、前記筒状部材の内部に収容され、前記
連結部材が挿通される筒状の緩衝部材とを備え、前記筒
状部材の内部に、前記連結部材に作用する衝撃力により
前記緩衝部材が半径方向に膨出可能な空隙が形成されて
いることを特徴とする落橋防止装置にある。That is, the present invention provides a bridge girder for preventing a bridge girder from dropping from a lower structure such as a pier or abutment by a connecting member having one end attached to an end of the bridge girder in the bridge axis direction. An apparatus, comprising: a tubular member fixed to an end of the bridge girder; and a tubular buffer member housed inside the tubular member, through which the connecting member is inserted. A bridge fall prevention device is characterized in that a gap is formed inside the buffer member so that the shock-absorbing member can radially swell by an impact force acting on the connecting member.
【０００９】またこの発明は、前記空隙が前記緩衝部材
と前記連結部材との間に形成された内側環状空隙と、前
記緩衝部材と前記筒状部材の内周との間に形成された外
側環状空隙とからなることを特徴とする落橋防止装置に
ある。The present invention also provides an inner annular space in which the space is formed between the cushioning member and the connecting member, and an outer annular space formed between the buffering member and the inner periphery of the tubular member. An apparatus for preventing a bridge from falling apart, comprising a gap.
【００１０】さらにこの発明は、前記緩衝部材の両端部
外周が前記筒状部材の内周に接し、前記外側環状空隙が
前記緩衝部材の両端部間に形成されていることを特徴と
する落橋防止装置にある。Further, the invention is characterized in that the outer periphery of both ends of the cushioning member is in contact with the inner periphery of the tubular member, and the outer annular gap is formed between both ends of the cushioning member. In the device.
【００１１】さらにこの発明は、前記緩衝部材は内外周
に内周テーパ面及び外周テーパ面を有し、前記内側環状
空隙が前記内周テーパ面と前記連結部材との間に形成さ
れ、前記外側環状空隙が前記外周テーパ面と前記筒状部
材の内周との間に形成されていることを特徴とする落橋
防止装置にある。Further, according to the present invention, the cushioning member has an inner peripheral taper surface and an outer peripheral taper surface on the inner and outer periphery, the inner annular gap is formed between the inner peripheral taper surface and the connecting member, and An apparatus for preventing a bridge from falling, wherein an annular gap is formed between the outer peripheral tapered surface and the inner periphery of the tubular member.
【００１２】大地震力により橋桁が移動すると、連結部
材には水平方向の衝撃力が作用する。この衝撃力により
緩衝部材が半径方向に膨出しながら圧縮変形する。この
ように、緩衝部材は膨出しながら圧縮変形するため、変
形量が大きく、したがって衝撃力の吸収率が高く、ブラ
ケットや連結部材に加わる衝撃力が緩和される。When the bridge girder moves due to a large earthquake force, a horizontal impact force acts on the connecting member. Due to this impact force, the cushioning member is compressed and deformed while expanding in the radial direction. As described above, since the cushioning member is compressed and deformed while swelling, the amount of deformation is large, the absorption rate of impact force is high, and the impact force applied to the bracket and the connecting member is reduced.
【００１３】[0013]
【発明の実施の形態】この発明の実施の形態を図面を用
いて以下に説明する。図１は、この発明の実施の形態を
示す全体正面図である。この実施の形態は、２径間以上
の単純桁橋の桁間に、この発明を適用した例である。こ
の単純桁橋においては、下部構造物である橋脚１の上部
に橋桁２、２の橋軸方向各端部が間隔を置いて対向して
載置される。温度変化等による橋桁２の伸縮は、橋桁
２、２間の間隔によって吸収される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall front view showing an embodiment of the present invention. This embodiment is an example in which the present invention is applied to a girder of a simple girder bridge having two or more spans. In this simple girder bridge, the bridge girder 2 and the respective ends in the bridge axial direction of the bridge girder 2 are mounted on the upper part of the pier 1 as a lower structure so as to face each other at intervals. Expansion and contraction of the bridge girder 2 due to a temperature change or the like is absorbed by the gap between the bridge girder 2 and 2.
【００１４】落橋防止装置３、３は橋桁２、２の各端部
に取付けられ、これらの端部を連結する部材である連結
ケーブル４を有している。図２は落橋防止装置の水平断
面図、図３は図２のＡ−Ａ線断面図である。落橋防止装
置３はブラケット５を有し、このブラケット５は橋桁２
のウェブ（鋼桁の場合）にライナープレート６を介して
多数の取付ボルト７により固定される取付プレート８
と、取付プレート８に設けられた上下一対の水平プレー
ト９、９と、これらの水平プレート９、９の中間部を横
切る橋軸方向に直角な鉛直プレート１０と、水平プレー
ト９、９間に設けられた一対の仕切プレート１１、１１
とからなっている。The bridge-preventing devices 3, 3 are attached to the respective ends of the bridge girders 2, 2, and have a connecting cable 4 as a member for connecting these ends. FIG. 2 is a horizontal sectional view of the bridge fall prevention device, and FIG. 3 is a sectional view taken along line AA of FIG. The fall prevention device 3 has a bracket 5, which is a bridge girder 2.
Mounting plate 8 which is fixed to the web (in the case of a steel girder) by a number of mounting bolts 7 via a liner plate 6
A pair of upper and lower horizontal plates 9, 9 provided on the mounting plate 8, a vertical plate 10 perpendicular to the bridge axis direction crossing an intermediate portion of these horizontal plates 9, 9, and provided between the horizontal plates 9, 9. Pair of partition plates 11, 11
It consists of
【００１５】鉛直プレート１０には筒状部材１２がほぼ
水平方向に固定されている。筒状部材１２は、一端が開
放するともに他端が端板１３によって閉鎖された、橋軸
方向とほぼ平行な軸線を持つ円筒形の部材であり、端板
１３がボルト１４により鉛直プレート１０に固定されて
いる。この筒状部材１２の内部には環状の支圧板１５が
軸線方向に摺動自在に配置されている。さらに、この支
圧板１５によって区画される筒状部材１２の内部には、
緩衝部材である筒状の緩衝ゴム１６が収容されている。A tubular member 12 is fixed to the vertical plate 10 in a substantially horizontal direction. The cylindrical member 12 is a cylindrical member having an axis substantially parallel to the bridge axis direction, one end of which is open and the other end of which is closed by an end plate 13. The end plate 13 is attached to the vertical plate 10 by bolts 14. Fixed. An annular pressure plate 15 is slidably disposed in the cylindrical member 12 in the axial direction. Further, inside the cylindrical member 12 partitioned by the support plate 15,
A cylindrical buffer rubber 16 which is a buffer member is accommodated.
【００１６】緩衝ゴム１６は、従来と同様にクロロプレ
ーンゴム等を成形したものである。緩衝ゴム１６の内径
は連結ケーブル４の径よりも大きく、したがって緩衝ゴ
ム１６と連結ケーブル４との間には内側環状空隙１７が
形成されている。また、緩衝ゴム１６の両端部は外径が
筒状部材１２の内径にほぼ等しく、筒状部材１２の内周
に接している。すなわち、緩衝ゴム１６の外周には環状
凹部が形成され、これにより緩衝ゴム１６と筒状部材１
２の内周との間に外側環状空隙１８が形成されている。The cushioning rubber 16 is formed by molding chloroprene rubber or the like as in the prior art. The inner diameter of the cushion rubber 16 is larger than the diameter of the connection cable 4, and therefore, an inner annular gap 17 is formed between the cushion rubber 16 and the connection cable 4. The outer diameter of both ends of the cushion rubber 16 is substantially equal to the inner diameter of the tubular member 12 and is in contact with the inner periphery of the tubular member 12. That is, an annular concave portion is formed on the outer periphery of the cushion rubber 16, whereby the cushion rubber 16 and the cylindrical member 1 are formed.
An outer annular space 18 is formed between the inner annular space 18 and the inner periphery of the outer ring 2.
【００１７】水平プレート９、９及び仕切プレート１
１、１１により区画された空間１９の入口部には偏向ブ
ロック２０が固定されている。この偏向ブロック２０は
ポリエチレン等の合成樹脂を成形した２つの分割ブロッ
クからなり、入口側が漸次広がる連結ケーブル４の挿通
孔２１を有している。Horizontal plates 9 and 9 and partition plate 1
A deflection block 20 is fixed to an entrance of a space 19 defined by 1 and 11. The deflection block 20 is composed of two divided blocks formed by molding a synthetic resin such as polyethylene, and has an insertion hole 21 for the connection cable 4 whose entrance side gradually widens.
【００１８】連結ケーブル４は、偏向ブロック２０、鉛
直板１０、緩衝ゴム１６及び支圧板１５に挿通され、端
部２２が支圧板１５から突出している。なお、この連結
ケーブル４はＰＣ鋼より線４ａを芯材とし（図３参
照）、ブラケット３に定着される端部側を鋼製のマンシ
ョン４ｂの内部に挿入固定し、それ以外の部分を合成樹
脂製の被覆材４ｃで被覆したものである。The connecting cable 4 is inserted through the deflection block 20, the vertical plate 10, the cushioning rubber 16 and the support plate 15, and the end 22 protrudes from the support plate 15. The connecting cable 4 is made of a PC steel wire 4a as a core material (see FIG. 3), the end fixed to the bracket 3 is inserted and fixed inside a steel apartment 4b, and the other parts are combined. It is covered with a resin covering material 4c.
【００１９】連結ケーブル４の端部２２すなわちマンシ
ョン４ｂの端部２２には、雄ねじ部２３が形成されてい
る。この雄ねじ部２３には、それぞれストッパを構成す
るワッシャ２４とナット２５が装着されている。そし
て、ワッシャ２４と支圧板１５との間には、スプリング
具体的にはマンション４ｂを包囲する截頭円錐形のコイ
ルスプリング２６が配置されている。連結ケーブル４の
移動量は、ナット２５の装着位置を変えることにより調
整することができる。An external thread 23 is formed at the end 22 of the connecting cable 4, that is, at the end 22 of the apartment 4b. A washer 24 and a nut 25 that constitute stoppers are mounted on the male screw portion 23, respectively. In addition, between the washer 24 and the support plate 15, a coil, specifically, a frusto-conical coil spring 26 surrounding the apartment 4b is disposed. The moving amount of the connecting cable 4 can be adjusted by changing the mounting position of the nut 25.
【００２０】筒状のカバー２７は、連結ケーブル４の端
部２２を覆うためのものであって、筒状部材１２にねじ
２８により着脱自在に取付けられている。連結ケーブル
４の端部２２と対向するカバー２７の端壁内面には、プ
レート状の緩衝ゴム２９が設けられている。この緩衝ゴ
ム２９は、大地震により桁間隔が極端に狭まったとき、
スプリング２６の伸び以上にマンション４ｂが移動する
のを制限するとともに、制限時の衝撃を緩和するための
ものである。The cylindrical cover 27 is for covering the end 22 of the connecting cable 4 and is detachably attached to the cylindrical member 12 by screws 28. A plate-shaped buffer rubber 29 is provided on the inner surface of the end wall of the cover 27 facing the end 22 of the connection cable 4. This cushion rubber 29 is used when the girder interval is extremely narrowed by a large earthquake.
This is for restricting the movement of the condominium 4b beyond the extension of the spring 26 and for reducing the impact at the time of the restriction.
【００２１】次に、上記実施の形態のものの作用を、図
４を参照して説明する。大地震力により橋桁２が大移動
をすると、連結ケーブル４には水平方向の衝撃力Ｐが作
用する。この衝撃力Ｐによりコイルスプリング２６が圧
縮変形するとともに、支圧板１５が筒状部材１２内を摺
動する。この支圧板１５の摺動に伴って、緩衝ゴム１６
が半径方向に膨出しながら圧縮変形する。Next, the operation of the above embodiment will be described with reference to FIG. When the bridge girder 2 makes a large movement due to a large seismic force, a horizontal impact force P acts on the connecting cable 4. The coil spring 26 is compressed and deformed by the impact force P, and the support plate 15 slides inside the tubular member 12. As the support plate 15 slides, the cushioning rubber 16
Undergoes compressive deformation while expanding in the radial direction.
【００２２】このように、緩衝ゴム１６は膨出しながら
圧縮変形するため、変形量が大きく、したがって衝撃力
の吸収率が高く、ブラケット３や連結ケーブル４に加わ
る衝撃力が緩和される。図５は、この発明による落橋防
止装置における緩衝ゴムの変位と衝撃力との関係を表す
グラフである。図５において、矢印で示す範囲が膨出を
含む変形であって、その後は緩衝ゴム１６が筒状部材１
２に密着して変形することになるが、立ち上がりの緩や
かな曲線となる。この結果、緩衝ゴムの設計支圧応力を
大きくとることが可能となり(２５０Kgf/cm2)、装置の
コンパクト化を図ることができる。As described above, since the cushioning rubber 16 is compressed and deformed while swelling, the deformation amount is large, the absorption rate of the impact force is high, and the impact force applied to the bracket 3 and the connecting cable 4 is reduced. FIG. 5 is a graph showing the relationship between the displacement of the cushioning rubber and the impact force in the device for preventing a bridge from falling according to the present invention. In FIG. 5, the range indicated by the arrow is the deformation including the swelling, and thereafter, the cushion rubber 16 is
Although it will be deformed in close contact with 2, it will have a gentle rising curve. As a result, the design bearing stress of the cushioning rubber can be increased (250 kgf / cm 2 ), and the device can be made compact.
【００２３】図６は、この発明の別の実施の形態であ
り、要部を拡大して示す水平断面図である。この実施の
形態は、筒状の緩衝部材１６の形状が前記実施の形態の
それと異なっている。すなわち、緩衝部材１６は、その
内周面及び外周面がそれぞれテーパ面１７ａ、１８ａと
なっていて、内周テーパ面１７ａと連結ケーブル４との
間に内側環状空隙１７が、外周テーパ面１８ａと筒状部
材１２との間に外側環状空隙１８がそれぞれ形成されて
いる。FIG. 6 is a horizontal sectional view showing another embodiment of the present invention, in which main parts are enlarged. In this embodiment, the shape of the cylindrical buffer member 16 is different from that of the above embodiment. That is, the inner circumferential surface and the outer circumferential surface of the cushioning member 16 are tapered surfaces 17a and 18a, respectively. The inner annular gap 17 is formed between the inner circumferential tapered surface 17a and the connection cable 4, and the outer circumferential tapered surface 18a is formed. An outer annular space 18 is formed between the cylindrical member 12 and the outer annular space 18.
【００２４】内周テーパ面１７ａは緩衝部材１６の内径
を衝撃力Ｐの作用方向に漸減させることにより、外周テ
ーパ面１８ａは緩衝部材１６の外径を同方向に漸増させ
ることにより、それぞれ形成されているが、これとは逆
に内径を漸増及び外径を漸減させることにより各テーパ
面を形成するようにしてもよい。The inner peripheral taper surface 17a is formed by gradually decreasing the inner diameter of the cushioning member 16 in the direction of action of the impact force P, and the outer peripheral taper surface 18a is formed by gradually increasing the outer diameter of the cushioning member 16 in the same direction. However, conversely, each tapered surface may be formed by gradually increasing the inner diameter and gradually decreasing the outer diameter.
【００２５】この実施の形態によれば、緩衝部材１６を
加硫成形する際の型抜きを容易に行うことができる。こ
の実施の形態のものの作用は、前記実施の形態とほぼ同
様であり、緩衝部材１６の変形特性は図５のようにな
る。According to this embodiment, it is possible to easily remove the mold when vulcanizing the cushioning member 16. The operation of this embodiment is almost the same as that of the above embodiment, and the deformation characteristics of the cushioning member 16 are as shown in FIG.
【００２６】上記実施の形態は例示にすぎず、この発明
は種々の形態を採ることができる。例えば、上記実施の
形態では橋桁上の桁間を連結する場合を示したが、橋台
と橋桁を連結する場合にも、この発明を適用できる。ま
た、緩衝ゴムと筒状部材との間に形成する空隙は、緩衝
ゴムが膨出可能なものであればよく、種々の形状を採用
することができる。The above embodiment is merely an example, and the present invention can take various forms. For example, in the above-described embodiment, the case where the girder on the bridge girder is connected is shown. However, the present invention is also applicable to the case where the abutment and the bridge girder are connected. The space formed between the cushion rubber and the cylindrical member may be any shape as long as the cushion rubber can swell, and various shapes can be adopted.
【００２７】[0027]
【発明の効果】以上のように、この発明によれば、緩衝
部材の緩衝効果が高まり、安全性の向上を図ることがで
きる。また、緩衝部材の設計支圧応力として大きな値を
採用することが可能となり、装置をコンパクト化して施
工性の向上を図ることができる。As described above, according to the present invention, the buffer effect of the buffer member is enhanced, and safety can be improved. Further, a large value can be adopted as the design bearing stress of the cushioning member, and the apparatus can be made compact and the workability can be improved.
【図１】図１は、この発明の実施の形態を示す全体正面
図である。FIG. 1 is an overall front view showing an embodiment of the present invention.
【図２】図２は落橋防止装置の水平断面図である。FIG. 2 is a horizontal cross-sectional view of the bridge fall prevention device.
【図３】図３は図２のＡ−Ａ線断面図である。FIG. 3 is a sectional view taken along line AA of FIG. 2;
【図４】図４は作用を説明する断面図である。FIG. 4 is a cross-sectional view illustrating an operation.
【図５】図５は、この発明による落橋防止装置における
衝撃力と緩衝ゴムの変位との関係を表すグラフである。FIG. 5 is a graph showing the relationship between the impact force and the displacement of the cushion rubber in the device for preventing a bridge from falling according to the present invention.
【図６】図６は別の実施の形態を示し、要部を拡大した
水平断面図である。FIG. 6 is a horizontal sectional view showing another embodiment, in which main parts are enlarged.
【図７】図７は従来装置における衝撃力と緩衝ゴムの変
位との関係を表すグラフである。FIG. 7 is a graph showing the relationship between the impact force and the displacement of the cushion rubber in the conventional device.
１…橋脚 ２…橋桁 ３…落橋防止装置 ４…連結ケーブル ５…ブラケット １０…鉛直プレート １２…筒状部材 １５…支圧板 １６…緩衝ゴム １７…内側環状空隙 １８…外側環状空隙 ２４…ワッシャ ２６…コイルスプリング DESCRIPTION OF SYMBOLS 1 ... Bridge pier 2 ... Bridge girder 3 ... Bridge fall prevention device 4 ... Connection cable 5 ... Bracket 10 ... Vertical plate 12 ... Cylindrical member 15 ... Bearing plate 16 ... Buffer rubber 17 ... Inner annular space 18 ... Outer annular space 24 ... Washer 26 ... coil spring
Claims (4)
けられた連結部材により前記橋桁が橋脚、橋台等の下部
構造物から落下するのを防止するための落橋防止装置で
あって、 前記橋桁の端部に固定された筒状部材と、 前記筒状部材の内部に収容され、前記連結部材が挿通さ
れる筒状の緩衝部材とを備え、 前記筒状部材の内部に、前記連結部材に作用する衝撃力
により前記緩衝部材が半径方向に膨出可能な空隙が形成
されていることを特徴とする落橋防止装置。1. A fall prevention device for preventing a bridge girder from falling from a lower structure such as a pier, an abutment or the like by a connecting member having one end attached to an end of the bridge girder in the bridge axis direction. A tubular member fixed to an end of the bridge girder, and a tubular buffer member housed inside the tubular member and through which the connecting member is inserted, and inside the tubular member, A bridge fall prevention device, wherein a gap is formed in which the buffer member can swell in a radial direction by an impact force acting on the connecting member.
の間に形成された内側環状空隙と、前記緩衝部材と前記
筒状部材の内周との間に形成された外側環状空隙とから
なることを特徴とする請求項１記載の落橋防止装置。2. An inner annular gap formed between the cushioning member and the connecting member, and an outer annular gap formed between the cushioning member and the inner periphery of the tubular member. The fall prevention device according to claim 1, characterized in that:
の内周に接し、前記外側環状空隙が前記緩衝部材の両端
部間に形成されていることを特徴とする請求項２記載の
落橋防止装置。3. The cushioning member according to claim 2, wherein outer peripheries of both ends of said cushioning member are in contact with an inner periphery of said tubular member, and said outer annular gap is formed between both ends of said cushioning member. Falling bridge prevention device.
外周テーパ面を有し、前記内側環状空隙が前記内周テー
パ面と前記連結部材との間に形成され、前記外側環状空
隙が前記外周テーパ面と前記筒状部材の内周との間に形
成されていることを特徴とする請求項２記載の落橋防止
装置。4. The cushioning member has an inner peripheral taper surface and an outer peripheral taper surface on the inner and outer circumferences, the inner annular gap is formed between the inner peripheral taper face and the connecting member, and the outer annular gap is formed. The fall prevention device according to claim 2, wherein the device is formed between the outer peripheral tapered surface and the inner periphery of the tubular member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30379996A JP3124500B2 (en) | 1996-09-03 | 1996-10-28 | Falling bridge prevention device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25236196 | 1996-09-03 | ||
| JP8-252361 | 1996-09-03 | ||
| JP30379996A JP3124500B2 (en) | 1996-09-03 | 1996-10-28 | Falling bridge prevention device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10131123A true JPH10131123A (en) | 1998-05-19 |
| JP3124500B2 JP3124500B2 (en) | 2001-01-15 |
Family
ID=26540689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30379996A Expired - Fee Related JP3124500B2 (en) | 1996-09-03 | 1996-10-28 | Falling bridge prevention device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3124500B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001064914A (en) * | 1999-08-26 | 2001-03-13 | Hanshin Expressway Public Corp | Displacement restriction device-cum-bridge fall prevention device |
| JP2004107909A (en) * | 2002-09-13 | 2004-04-08 | Tokyo Fabric Kogyo Kk | Connection type bridge-fall preventive device |
| JP2014034834A (en) * | 2012-08-09 | 2014-02-24 | Hanamizuki Bridge Planning Inc | Seismic isolation apparatus |
| JP2014228131A (en) * | 2013-05-27 | 2014-12-08 | 鹿島建設株式会社 | Suspension material support structure of aseismic device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4726095B1 (en) * | 2010-12-10 | 2011-07-20 | 株式会社Ｉｈｉ | Fall prevention device |
| CN105735115B (en) * | 2016-03-01 | 2017-05-10 | 石家庄铁道大学 | Connecting shock absorption device for continuous girder bridge zone control |
-
1996
- 1996-10-28 JP JP30379996A patent/JP3124500B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001064914A (en) * | 1999-08-26 | 2001-03-13 | Hanshin Expressway Public Corp | Displacement restriction device-cum-bridge fall prevention device |
| JP2004107909A (en) * | 2002-09-13 | 2004-04-08 | Tokyo Fabric Kogyo Kk | Connection type bridge-fall preventive device |
| JP2014034834A (en) * | 2012-08-09 | 2014-02-24 | Hanamizuki Bridge Planning Inc | Seismic isolation apparatus |
| JP2014228131A (en) * | 2013-05-27 | 2014-12-08 | 鹿島建設株式会社 | Suspension material support structure of aseismic device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3124500B2 (en) | 2001-01-15 |
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