JP5689699B2 - Fall bridge prevention device - Google Patents

Fall bridge prevention device Download PDF

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JP5689699B2
JP5689699B2 JP2011015890A JP2011015890A JP5689699B2 JP 5689699 B2 JP5689699 B2 JP 5689699B2 JP 2011015890 A JP2011015890 A JP 2011015890A JP 2011015890 A JP2011015890 A JP 2011015890A JP 5689699 B2 JP5689699 B2 JP 5689699B2
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悟 川上
悟 川上
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Description

本発明は、橋台や橋脚から橋桁を落下させないようにする落橋防止装置に関するものである。   The present invention relates to a falling bridge prevention device that prevents a bridge girder from dropping from an abutment or a pier.

落橋防止装置は、橋桁である一の構造物にブラケットを固定し、別の橋桁または橋脚または橋台である他の構造物にブラケットを固定し、両ブラケット間を連結部材で連結したものであって、地震等の際に橋桁が橋台や橋脚から落ちることを防止するものである。落橋防止装置としては、連結部材の一部を弾性体中に埋設して弾性部を形成したものが知られている（例えば、特許文献１、２参照。）。
また、道路橋示方書（平成８年）では、落橋防止装置は、死荷重反力の１．５倍の荷重に耐える耐力があること、桁かかり長の０．７５倍以下のできるだけ大きな遊間量を確保すること、衝撃的な地震力を緩和する機能を有することを規定している。 The falling bridge prevention device is a device in which a bracket is fixed to one structure that is a bridge girder, a bracket is fixed to another structure that is another bridge girder, a pier or an abutment, and both brackets are connected by a connecting member. The bridge girder is prevented from falling from the abutment or pier in the event of an earthquake. As a fallen bridge prevention device, one in which a part of a connecting member is embedded in an elastic body to form an elastic portion is known (for example, see Patent Documents 1 and 2).
In addition, according to the Road Bridge Specification (1996), the fallen bridge prevention device is capable of withstanding a load that is 1.5 times the dead load reaction force, and has as much gap as possible that is less than 0.75 times the girder length. It has the function to secure the seismic force and to reduce the shocking seismic force.

特許文献１に記載されている落橋防止装置は、連結部材であるチェーンを構成する長円状のリング体を互いに隙間をあけた状態でゴムや合成樹脂の弾性体中に埋設して大きな遊間量を確保するための弾性部を形成したもので、併せて弾性部の衝撃力緩和機能も利用している。特許文献２に記載されている落橋防止装置は、連結部材であるＰＣ鋼材（ＰＣ鋼線）の中間部をコイル状にしてスプリング部を形成し、このスプリング部の全体及びスプリング部から延びるＰＣ鋼材の一部をゴム材に埋設して弾性部を形成して大きな遊間量を確保しようとしたものである。これらのようにして、連結部材に弾性部を形成することで大きな遊間量を確保すると共に、地震の際に瞬間的に大きな衝撃力が落橋防止装置に作用するとき、落橋防止装置に作用する引張り力を減少させたり急激に連結部材に引張り力が作用することを防止したりする衝撃緩和性能を持たせようとしている。   The fallen bridge prevention device described in Patent Document 1 embeds an oval ring body constituting a chain as a connecting member in an elastic body of rubber or synthetic resin with a gap between each other, thereby providing a large amount of free space. An elastic part for securing the elastic part is formed, and the impact force relaxation function of the elastic part is also used. The fallen bridge prevention device described in Patent Document 2 is a PC steel material that extends from the entire spring portion and the spring portion by forming a spring portion by coiling the intermediate portion of the PC steel material (PC steel wire) that is a connecting member. A part of this is embedded in a rubber material to form an elastic portion so as to secure a large clearance. In this way, by forming an elastic part in the connecting member, a large amount of clearance is secured, and when a large impact force instantaneously acts on the bridge prevention device in the event of an earthquake, the tension acting on the bridge prevention device An attempt is made to provide impact mitigation performance that reduces the force or prevents a tensile force from acting on the connecting member suddenly.

特許第３７５６９７９号公報Japanese Patent No. 3756979 特開２０１０−２４２３５５号公報JP 2010-242355 A

しかしながら、特許文献１に記載されている落橋防止装置では、地震時遊間量を確保するための主な源がチェーンを構成する長円状のリング体間の隙間となっているため、大きな遊間量を確保することが難しく、そのためには連結部材長さを長くする必要があり、コンパクトな構造とすることができなかった。   However, in the fallen bridge prevention device described in Patent Document 1, the main source for securing the amount of play during an earthquake is a gap between the oval ring bodies that form the chain, so a large amount of play is provided. Therefore, it is difficult to ensure the length of the connecting member. For this purpose, it is necessary to increase the length of the connecting member, and a compact structure cannot be obtained.

また、特許文献２に記載されている落橋防止装置では、連結部材であるＰＣ鋼材の途中にコイル状のスプリング部を形成し、このスプリング部を含む箇所をゴム材中に埋設して弾性部を形成することで地震時の大きな遊間量を確保し、連結部材に作用する地震時衝撃力を弾性部で吸収させて衝撃緩和性能を持たせようとしている。しかし、この落橋防止装置が機能するには、ＰＣ鋼材のスプリング部は大きな荷重を伝えることができないため、大きな地震荷重の大部分をＰＣ鋼材の直線部からゴム材に伝える必要があり、そのためにはＰＣ鋼材の直線部を長くして、ゴム材中への埋め込み長も長くして、ＰＣ鋼材とゴム材の大きな付着面積を確保しなければならない。そのため、この構造の落橋防止装置もコンパクトな構造とすることが困難であった。さらに、ＰＣ鋼材の直線部の埋め込み長さが短い場合は、ＰＣ鋼材のフック部において曲げ集中応力、塑性変形を生じて大きい地震荷重を伝えることができない。   In addition, in the falling bridge prevention device described in Patent Document 2, a coil-shaped spring portion is formed in the middle of the PC steel material that is the connecting member, and the elastic portion is embedded by embedding a portion including the spring portion in the rubber material. By forming it, a large amount of clearance is secured at the time of an earthquake, and the impact force at the time of the earthquake acting on the connecting member is absorbed by the elastic portion so as to have an impact relaxation performance. However, in order for this fall prevention device to function, the spring part of PC steel cannot transmit a large load, so it is necessary to transmit a large part of the large earthquake load from the straight part of PC steel to the rubber material. The length of the straight portion of the PC steel material must be lengthened and the embedding length into the rubber material must be lengthened to ensure a large adhesion area between the PC steel material and the rubber material. For this reason, it has been difficult to make the bridge prevention device with this structure compact. Furthermore, when the embedding length of the straight portion of the PC steel material is short, bending concentrated stress and plastic deformation occur in the hook portion of the PC steel material, and a large earthquake load cannot be transmitted.

本発明が解決しようとする課題は、コンパクトな構造で衝撃緩和性能に優れた落橋防止装置を提供することにある。   The problem to be solved by the present invention is to provide a falling bridge prevention device having a compact structure and excellent impact relaxation performance.

前記課題を解決するため、本発明に係る落橋防止装置は、橋桁である一の構造物にブラケットを固定し、別の橋桁または橋脚または橋台である他の構造物にブラケットを固定し、両ブラケット間を連結部材で連結した落橋防止装置であって、前記連結部材は、コイル状のスプリングと、鋼板をそれぞれ加工した第１連結部及び第２連結部とを備え、前記第１連結部の一端に設けられた複数のねじ込み穴に前記スプリングの一端を順次通して前記スプリングと前記第１連結部をねじ込み接続し、前記第２連結部の一端に設けられた複数のねじ込み穴に前記スプリングの他端を順次通して前記スプリングと前記第２連結部をねじ込み接続し、前記スプリングの全体とこの前記スプリングの一端及び他端にそれぞれねじ込み接続された前記第１連結部及び前記第２連結部の一端を天然ゴムまたは合成ゴムまたは合成樹脂またはこれらの混合物よりなる弾性体中に埋設して弾性部を形成し、前記第１連結部と前記第２連結部の他端側は、それぞれ前記弾性体から突出、延長して前記各ブラケットに連結されていることを特徴とする。   In order to solve the above-described problem, a falling bridge prevention device according to the present invention fixes a bracket to one structure that is a bridge girder, and fixes the bracket to another structure that is another bridge girder, a bridge pier, or an abutment, and both brackets. A fallen bridge prevention device in which a connecting member is connected to each other, wherein the connecting member includes a coiled spring, a first connecting part and a second connecting part obtained by processing a steel plate, respectively, and one end of the first connecting part. One end of the spring is sequentially passed through a plurality of screw holes provided in the screw, and the spring and the first connecting portion are screwed and connected. The other screw is provided in the plurality of screw holes provided at one end of the second connecting portion. The first coupling is threadedly connected to the whole spring and one end and the other end of the spring by threading and connecting the spring and the second coupling portion sequentially through the ends. And one end of the second connecting part is embedded in an elastic body made of natural rubber, synthetic rubber, synthetic resin or a mixture thereof to form an elastic part, and the other end of the first connecting part and the second connecting part The sides protrude from and extend from the elastic body and are connected to the brackets.

また、前記課題を解決するため、本発明に係る落橋防止装置は、橋桁である一の構造物にブラケットを固定し、別の橋桁または橋脚または橋台である他の構造物にブラケットを固定し、両ブラケット間を連結部材で連結した落橋防止装置であって、前記連結部材は、コイル状のスプリングと、鋼板をそれぞれ加工した第１連結部及び第２連結部と、チェーン、シャックルとを備え、前記第１連結部の一端に設けられた複数のねじ込み穴に、前記スプリングの一端を順次通して前記スプリングと前記第１連結部をねじ込み接続し、前記第２連結部の一端に設けられた複数のねじ込み穴に、前記スプリングの他端を順次通して前記スプリングと前記第２連結部をねじ込み接続し、前記スプリングの全体とこの前記スプリングの一端及び他端にそれぞれねじ込み接続された前記第１連結部及び前記第２連結部の一端を天然ゴムまたは合成ゴムまたは合成樹脂またはこれらの混合物よりなる弾性体中に埋設して弾性部を形成し、前記第１連結部の他端側は、前記弾性体から突出してシャックルを介して前記チェーンの一端に連結され、このチェーンの他端がシャックルを介して前記一の構造物に固定したブラケットに連結され、前記第２連結部の他端側は、前記弾性体から突出してシャックルを介して前記チェーンの一端に連結され、このチェーンの他端がシャックルを介して前記他の構造物に固定したブラケットに連結されているか、あるいは前記第２連結部の他端側は、前記弾性体から突出してシャックルを介して前記他の構造物に固定したブラケットに連結されていることを特徴とする。   Moreover, in order to solve the above-described problem, the falling bridge prevention device according to the present invention fixes a bracket to one structure that is a bridge girder, and fixes the bracket to another structure that is another bridge girder, a pier, or an abutment, A fallen bridge prevention device in which both brackets are connected by a connecting member, wherein the connecting member includes a coiled spring, a first connecting part and a second connecting part obtained by processing a steel plate, a chain, and a shackle, One end of the spring is sequentially passed through a plurality of screw holes provided at one end of the first connection part, and the spring and the first connection part are screwed and connected, and a plurality of holes provided at one end of the second connection part. The other end of the spring is sequentially passed through the screwing hole of the screw, and the spring and the second connecting portion are screwed and connected to each other, and the spring is connected to one end and the other end of the spring. One end of the first connection part and the second connection part that are screw-connected is embedded in an elastic body made of natural rubber, synthetic rubber, synthetic resin, or a mixture thereof to form an elastic part, and the first connection The other end side of the part protrudes from the elastic body and is connected to one end of the chain via a shackle, and the other end of the chain is connected to a bracket fixed to the one structure via the shackle. The other end of the two connecting portions protrudes from the elastic body and is connected to one end of the chain via a shackle, and the other end of the chain is connected to a bracket fixed to the other structure via the shackle. Or the other end side of the second connecting portion protrudes from the elastic body and is connected to a bracket fixed to the other structure via a shackle. .

これらのように、本発明に係る落橋防止装置の連結部材は、地震時の大きな遊間量をスプリングと弾性体の伸びで得るため短い長さで大きな遊間量を確保することができるし、また、鋼板の連結部と弾性体を一体化するための埋め込み長も、スプリングのねじ込み部の表面積と鋼板の埋め込み面積を付着面積と見なして短くすることができるため、従来に比してコンパクトなものとすることができる。   As described above, the connecting member of the fallen bridge prevention device according to the present invention can secure a large amount of play with a short length because a large amount of play at the time of an earthquake is obtained by the extension of the spring and the elastic body. The embedding length for integrating the connecting part of the steel plate and the elastic body can be shortened by considering the surface area of the screwed part of the spring and the embedding area of the steel plate as the adhesion area, so it is compact compared to the conventional one. can do.

この場合において、第１連結部及び第２連結部を、それぞれ鋼板により断面十字状に形成することができる。   In this case, each of the first connecting portion and the second connecting portion can be formed in a cross-sectional shape using a steel plate.

本発明によれば、コンパクトな構造で衝撃緩和性能に優れた落橋防止装置が得られる。   ADVANTAGE OF THE INVENTION According to this invention, the fall-bridge prevention apparatus excellent in the impact relaxation performance with a compact structure is obtained.

本発明に係る実施形態の一例の落橋防止装置で橋桁と橋台を連結した状態を示す図である。It is a figure which shows the state which connected the bridge girder and the abutment with the fallen bridge prevention apparatus of an example of embodiment which concerns on this invention. 本実施形態の落橋防止装置で橋桁と橋桁を連結した状態を示す図である。It is a figure which shows the state which connected the bridge girder and the bridge girder with the fallen bridge prevention apparatus of this embodiment. 本実施形態の落橋防止装置に用いられる第１の連結部材の一例を示す図で、（ａ）は平面図、（ｂ）は正面図、（ｃ）は側面図である。It is a figure which shows an example of the 1st connection member used for the falling bridge prevention apparatus of this embodiment, (a) is a top view, (b) is a front view, (c) is a side view. 本実施形態の落橋防止装置に用いられる第２の連結部材の一例を示す図で、（ａ）は平面図、（ｂ）は正面図、（ｃ）は側面図である。It is a figure which shows an example of the 2nd connection member used for the falling bridge prevention apparatus of this embodiment, (a) is a top view, (b) is a front view, (c) is a side view. 本実施形態の落橋防止装置に用いられる第３の連結部材の一例を示す図で、（ａ）は平面図、（ｂ）は正面図である。It is a figure which shows an example of the 3rd connection member used for the falling bridge prevention apparatus of this embodiment, (a) is a top view, (b) is a front view.

以下、本発明に係る落橋防止装置の実施形態を添付図面に基づいて説明する。図１、図２に示すように、本実施形態の落橋防止装置１は、橋桁１１である一の構造物にブラケット１５を固定し、別の橋桁または橋脚または橋台である他の構造物（例えば図１に示す例では橋台１２、図２に示す例では別の橋桁１３）にブラケット１５を固定し、両ブラケット１５間を連結部材２（５，６）で連結して、地震等の際に橋桁１１、１３が橋台１２や橋脚から落ちることを防止しようとするものである。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a fallen bridge prevention device according to the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the falling bridge prevention device 1 according to the present embodiment fixes a bracket 15 to one structure that is a bridge girder 11 and another structure (for example, another bridge girder, a pier, or an abutment). In the example shown in FIG. 1, the bracket 15 is fixed to the abutment 12 and in the example shown in FIG. 2, the bracket 15 is fixed, and the brackets 15 are connected by the connecting members 2 (5, 6). It is intended to prevent the bridge girders 11 and 13 from falling from the abutment 12 or the pier.

ブラケット１５は、連結部材２（５，６）を取付けるための金具であって、橋桁または橋脚または橋台にアンカーボルトやボルトで固定されている。ブラケット１５は、従来の落橋防止装置に用いられてきたものと同様な構造のもので、連結部材２（５，６）と連結されて連結部材２（５，６）を支持し、地震荷重が伝達されるようになっている。   The bracket 15 is a metal fitting for attaching the connecting member 2 (5, 6), and is fixed to the bridge girder, the pier, or the abutment with an anchor bolt or a bolt. The bracket 15 has the same structure as that used in the conventional falling bridge prevention device, and is connected to the connecting member 2 (5, 6) to support the connecting member 2 (5, 6). It is to be transmitted.

図３は、本実施形態の落橋防止装置に用いられる第１の連結部材２を示した図である。図３に示すように、第１の連結部材２は、コイル状のスプリング２１と、スプリング２１の両端にスプリング２１にねじ込み接続された鋼板を加工した第１連結部２２及び第２連結部２３とを備えている。   FIG. 3 is a view showing the first connecting member 2 used in the falling bridge prevention device of the present embodiment. As shown in FIG. 3, the first connecting member 2 includes a coiled spring 21, a first connecting part 22 and a second connecting part 23 obtained by processing steel plates screwed and connected to the springs 21 at both ends of the spring 21. It has.

スプリング２１の線材としては、例えば、ばね鋼鋼材ＳＵＰ１０等が用いられ、線材を加熱してコイル状に成形し、その後熱処理してスプリング２１が形成される。スプリング２１の線材の径、コイルの径、巻数、ピッチは、地震時に必要とされる遊間量が得られ、許容応力を超えない寸法に設定される。   As the wire rod of the spring 21, for example, a spring steel material SUP10 or the like is used. The wire rod is heated to be formed into a coil shape, and then heat treated to form the spring 21. The diameter of the wire of the spring 21, the diameter of the coil, the number of turns, and the pitch are set to dimensions that do not exceed the allowable stress so that the amount of play required in the event of an earthquake can be obtained.

第１連結部２２及び第２連結部２３は、細長の矩形板状の鋼板で形成されている。第１連結部２２及び第２連結部２３である鋼板としては、例えば、一般構造用圧延鋼材や溶接構造用鋼材等が用いられるが、切断、成形、孔あけ、補強等加工した後溶融亜鉛メッキしたものを用いることが好ましい。第１連結部２２及び第２連結部２３である鋼板の幅は、スプリング２１のコイルの直径より大きな寸法で形成されている。第１連結部２２及び第２連結部２３である鋼板の厚さ（板厚）は、地震荷重に耐える寸法で形成されている。   The 1st connection part 22 and the 2nd connection part 23 are formed with the elongate rectangular plate-shaped steel plate. As the steel plates that are the first connecting portion 22 and the second connecting portion 23, for example, general structural rolled steel or welded structural steel is used, but after galvanizing after cutting, forming, drilling, reinforcing, and the like. It is preferable to use what was done. The widths of the steel plates that are the first connecting portion 22 and the second connecting portion 23 are formed to be larger than the diameter of the coil of the spring 21. The thickness (plate thickness) of the steel plates that are the first connecting portion 22 and the second connecting portion 23 is formed to have a size that can withstand an earthquake load.

第１連結部２２の一端には、スプリング２１の一端にねじ込み接続される複数のねじ込み穴２４が形成されている。ねじ込み穴２４は、径がスプリング２１の線材の外径より少し大きく、スプリング２１のコイルの直径の間隔で、スプリング２１のピッチと同じピッチで、かつ、スプリング２１にねじ込み接続されたとき、第１連結部２２の幅方向の中央に延びる中心線とスプリング２１の軸とが略同一線上になるように形成されている。第１連結部２２の他端には、ブラケット１５にピン１６を介して取り付けるためのピン穴２５が設けられている。第１連結部２２の他端の両面には、ピン穴２５を補強する補強板２６がそれぞれ設けられている。   A plurality of screw holes 24 that are screwed into one end of the spring 21 are formed at one end of the first connecting portion 22. The screw holes 24 have a diameter slightly larger than the outer diameter of the wire of the spring 21, are spaced at the same pitch as the pitch of the spring 21 at the interval of the coil diameter of the spring 21, and are screwed into the spring 21. A center line extending in the center of the connecting portion 22 in the width direction and the axis of the spring 21 are formed so as to be substantially on the same line. A pin hole 25 for attaching to the bracket 15 via the pin 16 is provided at the other end of the first connecting portion 22. Reinforcing plates 26 that reinforce the pin holes 25 are respectively provided on both surfaces of the other end of the first connecting portion 22.

第２連結部２３は、第１連結部１１と同様にねじ込み穴２４やピン穴２７がそれぞれ設けられ、かつ、ピン穴２７が補強板２８で補強されてなる。   Similarly to the first connecting portion 11, the second connecting portion 23 is provided with a screw hole 24 and a pin hole 27, and the pin hole 27 is reinforced by a reinforcing plate 28.

第１連結部２２のピン穴２５と第２連結部２３のピン穴２７のどちらか一方（図１ではピン穴２５）は、連結部材２の長手方向に長円状の長穴に形成され、橋桁の温度変化等による伸縮に対応するようになっている。これにより、橋桁１１が温度変化等により伸縮して例えば橋台１２に対して移動するときには、ブラケット１５と連結するピン１６が第１連結部２２のピン穴２５内を移動して弾性部４や橋桁に荷重がかかることが無いようになっている。   One of the pin hole 25 of the first connecting part 22 and the pin hole 27 of the second connecting part 23 (pin hole 25 in FIG. 1) is formed as an oblong slot in the longitudinal direction of the connecting member 2, It corresponds to expansion and contraction due to temperature changes of bridge girders. Thereby, when the bridge girder 11 expands and contracts due to a temperature change or the like and moves relative to the abutment 12, for example, the pin 16 connected to the bracket 15 moves in the pin hole 25 of the first connection part 22 to move the elastic part 4 or the bridge girder. The load is not applied to.

弾性体３は、天然ゴムまたは合成ゴムまたは合成樹脂またはこれらの混合物よりなり、例えば、高強度のゴムで強度16MPa、硬度55程度のものが用いられる。弾性体３でスプリング２１の全体とこのスプリング２１の一端及び他端にそれぞれねじ込み接続された第１連結部２２及び第２連結部２３の一端を埋設して弾性部４が形成されている。弾性部４は、スプリング２１の軸と同軸上の円柱状に形成されている。弾性部４の両端面から突出して、第１連結部２２及び第２連結部２３が軸方向に延びている。弾性部４の長さ、第１連結部２２及び第２連結部２３の埋め込み長さ、ねじ込み穴２４の個数は、スプリング２１、第１連結部２２、第２連結部２３及び弾性体３が一体となって挙動できる範囲から任意に設定される。また、地震の際に荷重を受けたときの大きな遊間量は、スプリング２１と弾性体３の変位によるが、その時のスプリング２１のせん断応力と弾性体３の軸応力を許容応力以下とすることによりスプリング２１と弾性体３の断面を設計することができる。   The elastic body 3 is made of natural rubber, synthetic rubber, synthetic resin, or a mixture thereof. For example, a high-strength rubber having a strength of 16 MPa and a hardness of about 55 is used. The elastic part 4 is formed by burying one end of the first connecting part 22 and the second connecting part 23 screwed and connected to the whole spring 21 and one end and the other end of the spring 21 with the elastic body 3. The elastic part 4 is formed in a cylindrical shape coaxial with the axis of the spring 21. The first connecting part 22 and the second connecting part 23 extend in the axial direction so as to protrude from both end faces of the elastic part 4. The length of the elastic part 4, the embedding length of the first connecting part 22 and the second connecting part 23, and the number of screw holes 24 are integrated with the spring 21, the first connecting part 22, the second connecting part 23, and the elastic body 3. It is set arbitrarily from the range that can behave. In addition, the large amount of clearance when receiving a load during an earthquake depends on the displacement of the spring 21 and the elastic body 3, but the shear stress of the spring 21 and the axial stress of the elastic body 3 at that time are less than the allowable stress. The cross section of the spring 21 and the elastic body 3 can be designed.

次にこの第１の連結部材２を用いた落橋防止装置１の作用を説明する。第１の連結部材２は、スプリング２１の両端に鋼板を加工した第１連結部２２及び第２連結部２３がそれぞれ接続され、スプリング２１全体とねじ込み接続された第１連結部２２及び第２連結部２３の一端が弾性体３中に埋め込まれて弾性部４が形成され、中央部ではスプリング２１と弾性体３が、両側では鋼板を加工した第１連結部２２及び第２連結部２３が荷重を伝え、かつ、スプリング２１と第１連結部２２及び第２連結部２３との間の各ねじ込み部分の弾性部４で荷重の受け渡しがそれぞれ行われるので、スプリング２１、弾性体３と第１連結部２２、第２連結部２３間の荷重の受け渡しが無理なく、滑らかに行われる。   Next, the operation of the falling bridge prevention device 1 using the first connecting member 2 will be described. In the first connecting member 2, a first connecting part 22 and a second connecting part 23, each of which is made of a steel plate, are connected to both ends of the spring 21, respectively. One end of the portion 23 is embedded in the elastic body 3 to form the elastic portion 4, and the spring 21 and the elastic body 3 are loaded at the center, and the first connecting portion 22 and the second connecting portion 23 obtained by processing a steel plate on both sides are loaded. Since the load is transferred by the elastic portion 4 of each screwed portion between the spring 21 and the first connecting portion 22 and the second connecting portion 23, the spring 21 and the elastic body 3 are connected to the first connecting portion. The transfer of the load between the portion 22 and the second connecting portion 23 is performed smoothly without difficulty.

このため、地震等の際に瞬間的に大きな衝撃力が発生して第１の連結部材２に瞬間的に大きな引張り力が作用すると、弾性体３とスプリング２１とが一体となって伸びて第１の連結部材２に作用する引張り力を吸収して、衝撃緩和機能が発揮される。すなわち、第１の連結部材２に作用する引張り力を減少させたり急激に連結部材２に引張り力が作用することを防止することができる。また、第１の連結部材２の弾性部４は、弾性体３とスプリング２１が主体であるため要求耐力を超えた後も非常に大きい変形能を有していて落橋損傷モードも優れている。   Therefore, when a large impact force is instantaneously generated during an earthquake or the like and a large tensile force is instantaneously applied to the first connecting member 2, the elastic body 3 and the spring 21 are integrally extended. Absorbing the tensile force acting on one connecting member 2, the impact mitigating function is exhibited. That is, it is possible to reduce the tensile force acting on the first connecting member 2 or to prevent the tensile force from acting on the connecting member 2 suddenly. Moreover, since the elastic part 4 of the 1st connection member 2 has the elastic body 3 and the spring 21 as a main body, it has a very large deformability even after exceeding a required yield strength, and the fall bridge damage mode is also excellent.

また、地震等の際に瞬間的に大きな衝撃力が発生して連結部材２に瞬間的に大きな圧縮力が作用すると、弾性体３とスプリング２１とが一体となって縮んで連結部材２に作用する圧縮力を吸収して、衝撃緩和機能が発揮される。また、スプリング２１と連結部材２との連結がねじ込み鋼板で行われているから鋼板を介してスプリング２１に荷重を伝えるため、引張りばねのフック部に相当するものが無いので、スプリング２１に無理なく荷重が伝わる。   Further, when a large impact force is instantaneously generated in the event of an earthquake or the like and a large compressive force is instantaneously applied to the connecting member 2, the elastic body 3 and the spring 21 are integrally compressed to act on the connecting member 2. Absorbs the compressive force that is exerted, and the impact mitigating function is exhibited. In addition, since the connection between the spring 21 and the connecting member 2 is performed by a screwed steel plate, the load is transmitted to the spring 21 through the steel plate, so there is no equivalent to the hook portion of the tension spring. Load is transmitted.

したがって、本実施形態の第１の連結部材２を用いた落橋防止装置１は、引張抵抗、圧縮抵抗の両方向に抵抗できる衝撃緩和性能に優れたものであり、落橋防止装置１の取り付け箇所数も減らすことも可能で、かつ、経済性の面でも優れている。なお、第１の連結部材２を使った本実施形態の落橋防止装置１は、引張、圧縮両方向抵抗型のものであるが、引張抵抗型の落橋防止装置としても用いることができることは勿論である。   Therefore, the falling bridge prevention device 1 using the first connecting member 2 of the present embodiment has excellent impact relaxation performance that can resist both the tensile resistance and the compression resistance. It can be reduced, and it is also economical. In addition, although the fall-bridge prevention apparatus 1 of this embodiment using the 1st connection member 2 is a thing of a tension | pulling and compression bidirectional resistance type, of course, it can be used also as a fall resistance type fall-bridge prevention apparatus. .

図４は、本実施形態の落橋防止装置１に用いられる第２の連結部材の一例を示す図である。図４に示すように、第２の連結部材５は、第１連結部５１及び第２連結部５２の断面形状がそれぞれ鋼板により断面十字状に形成されているものである。第２の連結部材５の基本的な構造は、前記の第１の連結部材２と第１連結部５１及び第２連結部５２の形状を除けば略同じであるのでその説明を省略し同一符号を付することがある。   FIG. 4 is a diagram illustrating an example of a second connecting member used in the fallen bridge prevention device 1 of the present embodiment. As shown in FIG. 4, the second connecting member 5 is such that the cross-sectional shapes of the first connecting portion 51 and the second connecting portion 52 are each formed of a steel plate in a cross shape. The basic structure of the second connecting member 5 is substantially the same except for the shapes of the first connecting member 2, the first connecting portion 51, and the second connecting portion 52. May be attached.

第１連結部５１及び第２連結部５２は、それぞれ鋼板により断面十字状に形成されている。第１連結部５１及び第２連結部５２の一端のねじ込み穴２４は、４つの各辺部（実質的には鋼板）にそれぞれ形成されており、これら４つの各辺部がスプリング２１の端部にねじ込み接続されている。このように構成することで、第１の連結部材２と同様な作用効果を得ることができ、かつ、第１連結部５１及び第２連結部５２は第１の連結部材２の場合と比較して鉛直軸まわりの断面性能が大きくなり、連結部材が長くなった場合でも、座屈が起こらないようにすることができるし、連結部材の長さ方向に直角方向に地震力が作用した場合の曲げにも対応することができる。また、スプリング２１のねじ込み部分も十字形状に形成され、スプリング２１のコイル１ピッチでスプリング２１が鋼板に４箇所でねじ込まれるから、第１連結部５１及び第２連結部５２とスプリング２１とがしっかりと固定される。さらに、スプリング２１は第１連結部５１及び第２連結部５２からの集中荷重を多くの点で受け持つこととなり、スプリング２１に生じる曲げ応力も減らすことができる。   The 1st connection part 51 and the 2nd connection part 52 are each formed in the cross-shaped cross section with the steel plate. The screw holes 24 at one ends of the first connecting portion 51 and the second connecting portion 52 are respectively formed in four side portions (substantially steel plates), and these four side portions are end portions of the spring 21. Screwed into the connection. By configuring in this way, it is possible to obtain the same effect as the first connecting member 2, and the first connecting portion 51 and the second connecting portion 52 are compared with the case of the first connecting member 2. Even if the cross-sectional performance around the vertical axis increases and the connecting member becomes longer, buckling can be prevented, and when the seismic force is applied perpendicular to the length direction of the connecting member. Can also bend. Further, the screwed portion of the spring 21 is also formed in a cross shape, and the spring 21 is screwed into the steel plate at four positions with the coil 1 pitch of the spring 21, so that the first connecting portion 51 and the second connecting portion 52 and the spring 21 are firmly connected. Fixed. In addition, the spring 21 is responsible for concentrated loads from the first connecting portion 51 and the second connecting portion 52 at many points, and the bending stress generated in the spring 21 can also be reduced.

図５は、本実施形態の落橋防止装置１に用いられる第３の連結部材の一例を示す図である。図５に示すように、第３の連結部材６は、スプリング２１の両端にねじ込み接続された鋼板を加工した第１連結部６１及び第２連結部６２を直接ブラケット１５に連結するのではなくチェーン６３、６４を用いて連結するものである。第３の連結部材６の基本的な構造は、前記の第１の連結部材２と同様であるのでその説明を省略し同一符号を付することがある。   FIG. 5 is a diagram illustrating an example of a third connecting member used in the fallen bridge prevention device 1 of the present embodiment. As shown in FIG. 5, the third connecting member 6 is not a chain that directly connects the first connecting portion 61 and the second connecting portion 62, which are made of steel plates screwed and connected to both ends of the spring 21, to the bracket 15. 63 and 64 are used for connection. Since the basic structure of the third connecting member 6 is the same as that of the first connecting member 2, the description thereof may be omitted and the same reference numerals may be given.

第１連結部６１及び第２連結部６２の他端側は、弾性体３の両端面の近傍に他端のピン穴が形成されている。これら第１連結部６１及び第２連結部６２の他端すなわち弾性体３の両端面から突出している両端部には、チェーン６３、６４の一端にそれぞれ接続されたシャックル６５に接続されていて、これらチェーン６３、６４の他端には、シャックル６５が接続され、これらシャックル６５が橋桁１１及び橋台１２や別の橋桁１３、橋脚等の他の構造物のブラケット１５に連結されている。この場合、どちらか一方のチェーン（例えばチェーン６４）を省いて、連結部と構造物のブラケットをシャックルを介して連結することも可能である。このように構成することで、圧縮力には抵抗できないが、前述と略同じ作用効果を奏する衝撃緩和性能に優れた引張抵抗型の第３の連結部材６が得られる。   On the other end side of the first connecting portion 61 and the second connecting portion 62, pin holes at the other end are formed in the vicinity of both end faces of the elastic body 3. The other ends of the first connecting portion 61 and the second connecting portion 62, that is, both end portions protruding from both end faces of the elastic body 3, are connected to shackles 65 connected to one ends of the chains 63 and 64, respectively. Shackles 65 are connected to the other ends of the chains 63 and 64, and the shackles 65 are connected to the bridge girder 11, the abutment 12, another bridge girder 13, and a bracket 15 of another structure such as a pier. In this case, it is also possible to omit one of the chains (for example, the chain 64) and connect the connecting portion and the bracket of the structure via a shackle. By configuring in this way, it is possible to obtain the tensile resistance type third connecting member 6 which is not able to resist the compressive force but has excellent impact mitigating performance and has substantially the same effect as described above.

１ 落橋防止装置
２ 第１の連結部材
３ 弾性体
４ 弾性部
５ 第２の連結部材
６ 第３の連結部材
１１ 橋桁
１２ 橋台
１３ 橋桁
１５ ブラケット
１６ ピン
２１ スプリング
２２ 第１連結部
２３ 第２連結部
２４ ねじ込み穴
２５ ピン穴
２６ 補強板
２７ ピン穴
２８ 補強板
５１ 第１連結部
５２ 第２連結部
６１ 第１連結部
６２ 第２連結部
６３ チェーン
６４ チェーン
６５ シャックル DESCRIPTION OF SYMBOLS 1 Falling bridge prevention apparatus 2 1st connection member 3 Elastic body 4 Elastic part 5 2nd connection member 6 3rd connection member 11 Bridge girder 12 Abutment 13 Bridge girder 15 Bracket 16 Pin 21 Spring 22 1st connection part 23 2nd connection part 24 screw hole 25 pin hole 26 reinforcing plate 27 pin hole 28 reinforcing plate 51 first connecting portion 52 second connecting portion 61 first connecting portion 62 second connecting portion 63 chain 64 chain 65 shackle

Claims (3)

橋桁である一の構造物にブラケットを固定し、別の橋桁または橋脚または橋台である他の構造物にブラケットを固定し、両ブラケット間を連結部材で連結した落橋防止装置であって、
前記連結部材は、コイル状のスプリングと、鋼板をそれぞれ加工した第１連結部及び第２連結部とを備え、前記第１連結部の一端に設けられた複数のねじ込み穴に前記スプリングの一端を順次通して前記スプリングと前記第１連結部をねじ込み接続し、前記第２連結部の一端に設けられた複数のねじ込み穴に前記スプリングの他端を順次通して前記スプリングと前記第２連結部をねじ込み接続し、
前記スプリングの全体とこの前記スプリングの一端及び他端にそれぞれねじ込み接続された前記第１連結部及び前記第２連結部の一端を天然ゴムまたは合成ゴムまたは合成樹脂またはこれらの混合物よりなる弾性体中に埋設して弾性部を形成し、
前記第１連結部と前記第２連結部の他端側は、それぞれ前記弾性体から突出、延長して前記各ブラケットに連結されていることを特徴とする落橋防止装置。 A falling bridge prevention device in which a bracket is fixed to one structure that is a bridge girder, a bracket is fixed to another structure that is another bridge girder or a pier or an abutment, and the brackets are connected by a connecting member,
The connecting member includes a coiled spring, a first connecting part and a second connecting part each processed from a steel plate, and one end of the spring is inserted into a plurality of screw holes provided at one end of the first connecting part. The spring and the first connecting part are screwed and connected sequentially, and the other end of the spring is sequentially passed through a plurality of screw holes provided at one end of the second connecting part to connect the spring and the second connecting part. Screw connection,
An elastic body made of natural rubber, synthetic rubber, synthetic resin, or a mixture of the whole of the spring and one end of the first connecting portion and the second connecting portion screwed and connected to one end and the other end of the spring, respectively. Embedded to form an elastic part,
The other bridge side of said 1st connection part and said 2nd connection part protrudes and extends from said elastic body, respectively, is connected to each said bracket, The fall prevention apparatus characterized by the above-mentioned. 橋桁である一の構造物にブラケットを固定し、別の橋桁または橋脚または橋台である他の構造物にブラケットを固定し、両ブラケット間を連結部材で連結した落橋防止装置であって、
前記連結部材は、コイル状のスプリングと、鋼板をそれぞれ加工した第１連結部及び第２連結部と、チェーン及びシャックルとを備え、前記第１連結部の一端に設けられた複数のねじ込み穴に前記スプリングの一端を順次通して前記スプリングと前記第１連結部をねじ込み接続し、前記第２連結部の一端に設けられた複数のねじ込み穴に前記スプリングの他端を順次通して前記スプリングと前記第２連結部をねじ込み接続し、
前記スプリングの全体とこの前記スプリングの一端及び他端にそれぞれねじ込み接続された前記第１連結部及び前記第２連結部の一端を天然ゴムまたは合成ゴムまたは合成樹脂またはこれらの混合物よりなる弾性体中に埋設して弾性部を形成し、
前記第１連結部の他端側は、前記弾性体から突出してシャックルを介して前記チェーンの一端に連結され、このチェーンの他端がシャックルを介して前記一の構造物に固定したブラケットに連結され、前記第２連結部の他端側は、前記弾性体から突出してシャックルを介して前記チェーンの一端に連結され、このチェーンの他端がシャックルを介して前記他の構造物に固定したブラケットに連結されているか、あるいは、前記第２連結部の他端側は、前記弾性体から突出してシャックルを介して前記他の構造物に固定したブラケットに連結されていることを特徴とする落橋防止装置。 A falling bridge prevention device in which a bracket is fixed to one structure that is a bridge girder, a bracket is fixed to another structure that is another bridge girder or a pier or an abutment, and the brackets are connected by a connecting member,
The connecting member includes a coiled spring, a first connecting part and a second connecting part obtained by processing a steel plate, a chain and a shackle, and a plurality of screw holes provided at one end of the first connecting part. One end of the spring is sequentially passed to screw and connect the spring and the first connecting portion, and the other end of the spring is sequentially passed through a plurality of screw holes provided at one end of the second connecting portion. Screw in the second connecting part,
An elastic body made of natural rubber, synthetic rubber, synthetic resin, or a mixture of the whole of the spring and one end of the first connecting portion and the second connecting portion screwed and connected to one end and the other end of the spring, respectively. Embedded to form an elastic part,
The other end of the first connecting portion protrudes from the elastic body and is connected to one end of the chain via a shackle, and the other end of the chain is connected to a bracket fixed to the one structure via the shackle. The other end of the second connecting portion protrudes from the elastic body and is connected to one end of the chain via a shackle, and the other end of the chain is fixed to the other structure via the shackle. Or the other end of the second connecting portion protrudes from the elastic body and is connected to a bracket fixed to the other structure via a shackle. apparatus. 前記第１連結部及び前記第２連結部は、それぞれ鋼板により断面十字状に形成されている請求項１又は２に記載の落橋防止装置。   The falling bridge prevention device according to claim 1 or 2, wherein the first connecting part and the second connecting part are each formed in a cross-shaped cross section by a steel plate.
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