JP2012122288A - Fall prevention device - Google Patents
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- JP2012122288A JP2012122288A JP2010275369A JP2010275369A JP2012122288A JP 2012122288 A JP2012122288 A JP 2012122288A JP 2010275369 A JP2010275369 A JP 2010275369A JP 2010275369 A JP2010275369 A JP 2010275369A JP 2012122288 A JP2012122288 A JP 2012122288A
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Abstract
Description
本発明は、橋桁や橋梁等の上部構造が橋脚や橋台等の下部構造から落下することを防止する落下防止装置に関し、特に、大地震時に効果的に作用する落下防止装置に関する。 The present invention relates to a fall prevention device that prevents an upper structure such as a bridge girder or a bridge from falling from a lower structure such as a pier or an abutment, and more particularly, to a fall prevention device that works effectively during a large earthquake.
想定外の地振動の発生、周辺地盤の破壊、構造部材の予測しない振動等により、想定を超える地震力や変位又は変形が橋等の陸上構造物や海上構造物に生じる場合がある。かかる不測の事態が生じた場合であっても、橋桁や橋梁等の上部構造が橋脚や橋台等の下部構造から落下することを防止する必要があり、種々の落下防止装置が提案されている（特許文献１〜特許文献３）。なお、一般に、橋の落下防止装置を落橋防止装置と称する。 The occurrence of unexpected ground vibrations, destruction of surrounding ground, unpredicted vibrations of structural members, etc. may cause earthquake forces, displacements or deformations that exceed expectations to occur on land structures such as bridges and offshore structures. Even when such an unexpected situation occurs, it is necessary to prevent the upper structure such as the bridge girder and the bridge from falling from the lower structure such as the pier and the abutment, and various fall prevention devices have been proposed ( Patent Documents 1 to 3). In general, the fall prevention device for a bridge is referred to as a fall prevention device.
例えば、特許文献１には、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、連結部材が挿通される筒状の緩衝部材とを備え、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、前記内周テーパ面と前記連結部材との間に内側環状空隙が形成され、前記外周テーパ面と前記筒状部材の内周との間に外側環状空隙が形成され、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となっていることを特徴とする落橋防止装置が開示されている。かかる落橋防止装置では、緩衝部材に所定の空隙を形成することにより、緩衝部材の緩衝効果を高め、安全性の向上を図っている。 For example, Patent Literature 1 includes a cylindrical member fixed to an end portion of a bridge girder, and a cylindrical buffer member that is accommodated in the cylindrical member and through which a connecting member is inserted. An inner peripheral tapered surface and an outer peripheral tapered surface are formed on the inner and outer periphery, an inner annular gap is formed between the inner peripheral tapered surface and the connecting member, and between the outer peripheral tapered surface and the inner periphery of the tubular member An outer annular gap is formed on the bridge member, and the shock-absorbing device is disclosed in which the shock-absorbing member can bulge in the radial direction by an impact force acting on the connecting member. In such a fallen bridge prevention device, a predetermined gap is formed in the buffer member, thereby enhancing the buffer effect of the buffer member and improving safety.
また、特許文献２には、橋桁の端部に設けられ連結ケーブルが挿通される挿通孔を有するブラケットと、このブラケットから突出する連結ケーブルの端部に固定されたストッパとを備え、前記ブラケットと前記ストッパとの間の連結ケーブルの外周に、互いに隣接するものどうしが逆向きとなるように多数の皿ばね状部材を嵌合配置し、前記各皿ばね状部材は、互いに隣接するものどうしが当接する外周縁が平坦面に形成されていることを特徴とする落橋防止装置が開示されている。また、皿ばね状部材には、降伏後の延びが大きいＳＳ４００等の低降伏点鋼が用いられる旨も開示されている。かかる落橋防止装置では、橋桁の変位が小さい通常の地震時にはコイルスプリングが作用し、橋桁の変位が大きい大地震時には皿ばね状部材が作用するように構成されている。皿ばね状部材は、降伏点に達した後、塑性変形して地震のエネルギーを吸収する。 Patent Document 2 includes a bracket provided at an end of a bridge girder and having an insertion hole through which a connection cable is inserted, and a stopper fixed to an end of the connection cable protruding from the bracket. A large number of disc spring-like members are fitted and arranged on the outer periphery of the connecting cable between the stopper and the adjacent ones in opposite directions, and the disc spring-like members are adjacent to each other. A fallen bridge prevention device is disclosed in which the outer peripheral edge that abuts is formed on a flat surface. Further, it is also disclosed that low yield point steel such as SS400 having a large extension after yielding is used for the disc spring-like member. Such a falling bridge prevention device is configured such that a coil spring acts during a normal earthquake with a small displacement of the bridge girder and a disc spring-like member acts during a large earthquake with a large displacement of the bridge girder. After reaching the yield point, the disc spring-like member plastically deforms to absorb the energy of the earthquake.
また、特許文献３には、橋桁と橋桁又は橋桁と下部工からなる連結対象どうしを橋軸に沿う垂直平面上で相対変位可能に連結する第１、第２連結手段を有し、上記第２連結手段が、上記第１連結手段と比べて、降伏耐力又は降伏点が小さく降伏後の伸びが大きい部材を主要構成とし、しかも変位許容範囲が小さいことを特徴とする橋桁の落橋防止装置が開示されている。かかる落橋防止装置では、大地震が起きたときに、第２連結手段によって地震エネルギーを吸収し、橋桁の連結状態を確実に維持できるようにしている。 Further, Patent Document 3 includes first and second connecting means for connecting the connection objects composed of the bridge girder and the bridge girder or the bridge girder and the substructure so as to be relatively displaceable on a vertical plane along the bridge axis. Disclosed is a bridge girder falling prevention device characterized in that the connecting means is mainly composed of a member having a small yield strength or yield point and a large elongation after yielding as compared with the first connecting means, and having a small allowable displacement range. Has been. In such a fallen bridge prevention device, when a large earthquake occurs, the second connecting means absorbs the seismic energy so that the connection state of the bridge girder can be reliably maintained.
ところで、橋の耐震設計では、道路橋示方書によれば、橋の供用期間中に発生する確率が高い地震動（レベル１地震動）及び橋の供用期間中に発生する確率は低いが大きな強度をもつ地震動（レベル２地震動）の二段階のレベルの設計地震動を考慮しなければならないとされている。また、近年では、落橋防止装置の設計に際し、レベル２地震動を超える地震動（以下、本明細書において「レベル３地震動」という。）を考慮することが好ましいとされている。 By the way, in the seismic design of the bridge, according to the road bridge specifications, there is a high probability that the ground motion that is likely to occur during the service period of the bridge (Level 1 ground motion) and the probability that it will occur during the service period of the bridge is low but has high strength. It is said that the design ground motion at two levels of ground motion (level 2 ground motion) must be considered. In recent years, it has been considered preferable to consider a ground motion exceeding Level 2 ground motion (hereinafter referred to as “Level 3 ground motion” in the present specification) when designing a fall prevention device.
しかしながら、特許文献１に記載された落橋防止装置では、緩衝部材の緩衝力を向上させることにより装置の小型化を図ることはできるものの、レベル３地震動に耐え得る構造にはなっていなかった。 However, although the fallen bridge preventing device described in Patent Document 1 can reduce the size of the device by improving the buffering force of the buffer member, it has not been configured to withstand Level 3 earthquake motion.
また、特許文献２に記載された落橋防止装置では、複数の皿ばね状部材を塑性変形させることにより、地震エネルギーを吸収しているが、皿ばね状部材は、弾性力により変形して最大限圧縮された後に塑性変形されるため、塑性変形できる軸方向の長さが短く、地震エネルギーを効果的に吸収することができないという問題があった。 Moreover, in the fallen bridge prevention device described in Patent Document 2, the seismic energy is absorbed by plastically deforming a plurality of disc spring-like members. However, the disc spring-like member is deformed by an elastic force to the maximum extent. Since it is plastically deformed after being compressed, there is a problem that the axial length that can be plastically deformed is short, and seismic energy cannot be absorbed effectively.
また、特許文献３に記載された落橋防止装置では、降伏耐力又は降伏点が小さく降伏後の伸びが大きい第２連結手段により、地震エネルギーを吸収することができ、レベル３地震動に耐え得る構造が提供されるものの、第２連結手段が露出しており、風雨に曝されてしまうことから、錆びが生じ易く、経年劣化が早いという問題があった。 In addition, in the falling bridge prevention device described in Patent Document 3, the second connecting means having a small yield strength or yield point and a large elongation after yielding can absorb seismic energy and can withstand level 3 earthquake motion. Although provided, the second connecting means is exposed and exposed to wind and rain, so that there is a problem that rust is likely to occur and deterioration over time is rapid.
また、上述したこれらの問題は、落橋防止装置に限られるものではなく、橋以外の陸上構造物や海上構造物における落下防止装置においても同様に生じ得る問題である。 Moreover, these problems described above are not limited to the fall-bridge prevention device, and can also occur in the fall-prevention device in land structures other than bridges and offshore structures.
本発明は、上述した問題点に鑑み創案されたものであり、レベル２地震動を超える地震動であっても、橋桁や橋梁等の上部構造の落下を効果的に抑制することができる落下防止装置を提供することを目的とする。 The present invention was devised in view of the above-described problems, and a fall prevention device capable of effectively suppressing the fall of the superstructure such as a bridge girder and a bridge even if the ground motion exceeds Level 2 ground motion. The purpose is to provide.
本発明によれば、一端が上部構造に接続され、他端が下部構造に接続され、前記上部構造の前記下部構造からの落下を防止する落下防止装置であって、前記上部構造に接続される第一支持部と、前記下部構造に接続される第二支持部と、前記第一支持部及び前記第二支持部に接続される連結部材と、該連結部材の両端に配置され前記連結部材の位置を固定するとともに衝撃を緩和する緩衝機構と、該緩衝機構と前記第一支持部又は前記第二支持部との間に配置されるエネルギー吸収部材と、該エネルギー吸収部材及び前記緩衝機構を覆う保護部材と、を備え、前記エネルギー吸収部材は、低降伏点材により形成される筒部と、該筒部に接続され前記緩衝機構に当接する蓋部と、を有する、ことを特徴とする落下防止装置が提供される。 According to the present invention, there is provided a fall prevention device for preventing a fall of the upper structure from the lower structure, one end of which is connected to the upper structure and the other end of which is connected to the lower structure. A first support part; a second support part connected to the lower structure; a connecting member connected to the first support part and the second support part; and disposed at both ends of the connecting member. A buffer mechanism for fixing a position and reducing an impact, an energy absorbing member disposed between the buffer mechanism and the first support part or the second support part, and covering the energy absorbing member and the buffer mechanism The energy absorbing member has a cylindrical portion formed of a low yield point material, and a lid that is connected to the cylindrical portion and abuts against the buffer mechanism. A prevention device is provided.
前記エネルギー吸収部材は、例えば、レベル２地震動を超える地震動が発生した場合に相当する力が作用した場合に、塑性変形して地震エネルギーを吸収する部材である。 The energy absorbing member is, for example, a member that plastically deforms and absorbs seismic energy when a force corresponding to a seismic motion exceeding Level 2 seismic motion occurs.
前記緩衝機構はコイルスプリングを有し、該コイルスプリングの長さ又は弾性力を調節することにより、レベル２地震動を超える地震動が発生した場合又はレベル２地震動以下の地震動が発生した場合に、前記エネルギー吸収部材に対して塑性変形し得る力が作用するように構成してもよい。 The buffer mechanism has a coil spring, and when the earthquake motion exceeding the level 2 earthquake motion occurs or the earthquake motion less than the level 2 earthquake motion occurs by adjusting the length or elastic force of the coil spring, the energy You may comprise so that the force which can carry out plastic deformation acts with respect to an absorption member.
前記筒部は、前記第一支持部又は前記第二支持部に当接する底部を有していてもよいし、内部に同心上に配置された内筒部を有していてもよい。 The said cylinder part may have a bottom part contact | abutted to said 1st support part or said 2nd support part, and may have the inner cylinder part arrange | positioned concentrically inside.
前記連結部材の長さを延長する延長部材と、該延長部材及び前記連結部材を連結する結合部材と、前記連結部材の延長部分に挿通されるスペーサと、を有していてもよい。 You may have the extension member which extends the length of the said connection member, the coupling member which connects this extension member and the said connection member, and the spacer penetrated by the extension part of the said connection member.
前記第一支持部は、前記上部構造に接続される固定部と、該固定部に回動可能に接続された揺動部と、を有し、該揺動部に前記連結部材が接続されていてもよい。 The first support portion includes a fixed portion connected to the superstructure, and a swinging portion rotatably connected to the fixed portion, and the connecting member is connected to the swinging portion. May be.
前記上部構造は、例えば、橋桁又は橋梁であってもよいし、前記下部構造は、例えば、橋脚又は橋台であってもよい。 The upper structure may be a bridge girder or a bridge, for example, and the lower structure may be a pier or an abutment, for example.
上述した本発明に係る落下防止装置によれば、低降伏点材により形成されたエネルギー吸収部材を緩衝機構と第一支持部又は第二支持部との間に配置したことにより、レベル２地震動を超える地震動であっても、エネルギー吸収部材の塑性変形によって、橋桁や橋梁等の上部構造の落下を効果的に抑制することができる。また、エネルギー吸収部材を筒形状に形成したことにより、エネルギー吸収部材の変形できる軸方向の長さを任意に設定することができ、地震エネルギーを効果的に吸収することができる。また、エネルギー吸収部材を保護部材の中に封入したことにより、エネルギー吸収部材を風雨から保護することができ、錆びの発生を抑制し、経年劣化の進行を抑制することができる。 According to the above-described fall prevention device according to the present invention, the energy absorbing member formed of the low yield point material is disposed between the buffer mechanism and the first support part or the second support part, so that level 2 earthquake motion can be generated. Even if the earthquake motion exceeds, it is possible to effectively suppress the fall of the superstructure such as the bridge girder and the bridge by the plastic deformation of the energy absorbing member. Moreover, since the energy absorbing member is formed in a cylindrical shape, the axial length in which the energy absorbing member can be deformed can be arbitrarily set, and seismic energy can be effectively absorbed. Moreover, by enclosing the energy absorbing member in the protective member, the energy absorbing member can be protected from wind and rain, the occurrence of rust can be suppressed, and the progress of aging can be suppressed.
以下、本発明の落下防止装置に係る第一実施形態について、図１〜図３を用いて説明する。ここで、図１は、本発明の第一実施形態に係る落下防止装置の全体構成図である。図２は、図１に示した落下防止装置の部分拡大図であり、（ａ）は平常時、（ｂ）は変形時、を示している。図３は、図１に示した落下防止装置の作用を示す図であり、（ａ）は平常時、（ｂ）はレベル１地震動時、（ｃ）はレベル２地震動時、（ｄ）はレベル３地震動時、を示している。 Hereinafter, 1st embodiment which concerns on the fall prevention apparatus of this invention is described using FIGS. 1-3. Here, FIG. 1 is an overall configuration diagram of the fall prevention device according to the first embodiment of the present invention. 2A and 2B are partially enlarged views of the fall prevention device shown in FIG. 1, wherein FIG. 2A shows a normal time and FIG. 2B shows a deformed state. FIG. 3 is a diagram showing the operation of the fall prevention device shown in FIG. 1, where (a) is normal, (b) is during level 1 earthquake motion, (c) is during level 2 earthquake motion, and (d) is level. 3 shows the time of earthquake motion.
本発明の第一実施形態に係る落下防止装置１は、図１及び図２に示したように、一端が上部構造２に接続され、他端が下部構造３に接続され、上部構造２の下部構造３からの落下を防止する落下防止装置であって、上部構造２に接続される第一支持部２１と、下部構造３に接続される第二支持部３１と、第一支持部２１及び第二支持部３１に接続される連結部材４と、連結部材４の両端に配置され連結部材４の位置を固定するとともに衝撃を緩和する緩衝機構５と、緩衝機構５と第一支持部２１との間に配置されるエネルギー吸収部材６と、エネルギー吸収部材６及び緩衝機構５を覆う保護部材７と、を備え、エネルギー吸収部材６は、低降伏点材により形成される筒部６１と、筒部６１に接続され緩衝機構５に当接する蓋部６２と、を有する。 As shown in FIGS. 1 and 2, the fall prevention device 1 according to the first embodiment of the present invention has one end connected to the upper structure 2 and the other end connected to the lower structure 3. A fall prevention device for preventing a fall from the structure 3, the first support portion 21 connected to the upper structure 2, the second support portion 31 connected to the lower structure 3, the first support portion 21 and the first support portion 21. A connecting member 4 connected to the two support portions 31; a buffer mechanism 5 that is disposed at both ends of the connecting member 4 to fix the position of the connecting member 4 and relieve shock; and the buffer mechanism 5 and the first support portion 21 An energy absorbing member 6 disposed between the protective member 7 and the energy absorbing member 6 and the buffer mechanism 5. The energy absorbing member 6 includes a cylindrical portion 61 formed of a low yield point material, and a cylindrical portion. And a lid portion 62 that is connected to 61 and abuts against the buffer mechanism 5. .
前記上部構造２及び前記下部構造３は、例えば、橋等の陸上構造物や海上構造物を構成する構造物の総称であり、下部構造３の上に上部構造２が配置された位置関係を有する。以下、落下防止装置１が落橋防止装置の場合を前提として説明する。すなわち、以下の説明において、上部構造２は橋桁や橋梁等を意味し、下部構造３は橋脚や橋台等を意味する。落下防止装置１は、かかる上部構造２と下部構造３とを連結部材４で連結することにより、上部構造２の地震時における相対移動を制限し、下部構造３からの落下を防止する。特に、本実施形態に係る落下防止装置１は、レベル２地震動を超える地震動、すなわち、レベル３地震動が生じた際に効果的に作用する。 The upper structure 2 and the lower structure 3 are, for example, generic names of structures that constitute land structures such as bridges and offshore structures, and have a positional relationship in which the upper structure 2 is disposed on the lower structure 3. . Hereinafter, the case where the fall prevention device 1 is a fall bridge prevention device will be described. That is, in the following description, the upper structure 2 means a bridge girder, a bridge, or the like, and the lower structure 3 means a pier, an abutment, or the like. The fall prevention device 1 connects the upper structure 2 and the lower structure 3 with the connecting member 4, thereby restricting the relative movement of the upper structure 2 during an earthquake and preventing the fall from the lower structure 3. In particular, the fall prevention device 1 according to the present embodiment works effectively when a seismic motion exceeding a level 2 seismic motion, that is, a level 3 seismic motion occurs.
上部構造２と下部構造３との間には、落下防止装置１の他に、主として、レベル２地震動以下の地震によるエネルギーを吸収する支承３２、伸縮装置３３、変位制限装置３４等が配置されることが多い。下部構造３は、上部構造２を載置する支持面３ａと、上部構造２の側面に沿って形成された壁面３ｂと、を有し、支持面３ａには、ゴム製の支承３２が配置され、支承３２の上に上部構造２が載置される。また、壁面３ｂと上部構造２との間には伸縮装置３３が配置される。かかる支承３２の歪み及び伸縮装置３３の伸縮により地震時における上部構造２のエネルギーが吸収される。さらに、支持面３ａには、変位制限装置３４も配置される。変位制限装置３４は、支持面３ａに立設された鋼棒を上部構造２の底面に形成された凹部に挿通することによって形成される。変位制限装置３４は、鋼棒が凹部の壁部に押し付けられることによって物理的に上部構造２の移動を拘束する。支持面３ａには、支承３２が破壊した際に生じる上部構造２の落差をなくすための段差防止部材を配置するようにしてもよい。また、上部構造２と下部構造３との係止部分の長さ（係止長さ）を桁かかり長ＳＥと称する。 Between the upper structure 2 and the lower structure 3, in addition to the fall prevention device 1, a support 32, an expansion device 33, a displacement limiting device 34, and the like that mainly absorb energy from an earthquake of a level 2 earthquake or less are disposed. There are many cases. The lower structure 3 has a support surface 3a on which the upper structure 2 is placed and a wall surface 3b formed along the side surface of the upper structure 2, and a rubber support 32 is disposed on the support surface 3a. The upper structure 2 is placed on the support 32. An expansion / contraction device 33 is disposed between the wall surface 3b and the upper structure 2. The energy of the superstructure 2 during an earthquake is absorbed by the distortion of the support 32 and the expansion / contraction of the expansion / contraction device 33. Further, a displacement limiting device 34 is also disposed on the support surface 3a. The displacement limiting device 34 is formed by inserting a steel bar erected on the support surface 3 a into a recess formed on the bottom surface of the upper structure 2. The displacement limiting device 34 physically restrains the movement of the superstructure 2 by pressing the steel bar against the wall of the recess. You may make it arrange | position the level | step difference prevention member for eliminating the drop of the upper structure 2 produced when the support 32 destroys to the support surface 3a. Also referred to the length of the locking portion of the upper structure 2 and a lower structure 3 (locking length) and digit takes length S E.
また、上部構造２には第一支持部２１が設置され、下部構造３には第二支持部３１が設置されている。第一支持部２１及び第二支持部３１は、例えば、複数の鋼板により構成されたブラケットであり、それぞれ、連結部材４に対して略垂直に配置された垂直プレート２１ａ，３１ａを有する。かかる第一支持部２１及び第二支持部３１には、従来から使用されているものをそのまま使用することができ、例えば、連結部材４の外周を囲うような箱状に形成されていてもよいし、連結部材４を支持する偏向具を備えていてもよい。なお、第一支持部２１及び第二支持部３１を上部構造２及び下部構造３に固定するアンカーについては、図を省略してある。 A first support portion 21 is installed in the upper structure 2, and a second support portion 31 is installed in the lower structure 3. The first support portion 21 and the second support portion 31 are, for example, brackets made of a plurality of steel plates, and each include vertical plates 21 a and 31 a that are disposed substantially perpendicular to the connecting member 4. As the first support portion 21 and the second support portion 31, those conventionally used can be used as they are, and for example, may be formed in a box shape surrounding the outer periphery of the connecting member 4. In addition, a deflecting tool that supports the connecting member 4 may be provided. In addition, about the anchor which fixes the 1st support part 21 and the 2nd support part 31 to the upper structure 2 and the lower structure 3, the figure is abbreviate | omitted.
また、図１では、上部構造２の底部に第一支持部２１を設置し、下部構造３の側面部に第二支持部３１を設置しているが、上部構造２の側面部に第一支持部２１を設置してもよいし、第一支持部２１及び第二支持部３１は略水平となる位置に設置してもよい。 In FIG. 1, the first support 21 is installed at the bottom of the upper structure 2 and the second support 31 is installed at the side of the lower structure 3, but the first support is provided at the side of the upper structure 2. The part 21 may be installed, and the first support part 21 and the second support part 31 may be installed at a substantially horizontal position.
前記連結部材４は、上部構造２と下部構造３とを連結する部材であり、例えば、ＰＣケーブルにより構成される。ＰＣケーブルは、プレストレストコンクリート構造物の緊張材として用いる鋼線である。本実施形態における連結部材４には、従来から使用されている連結部材を使用することができ、ＰＣケーブルに限定されるものではなく、鋼棒やチェーン等であってもよい。 The connecting member 4 is a member that connects the upper structure 2 and the lower structure 3, and is composed of, for example, a PC cable. The PC cable is a steel wire used as a tension material for a prestressed concrete structure. Conventionally used connecting members can be used for the connecting member 4 in the present embodiment, and the connecting member 4 is not limited to a PC cable, and may be a steel rod, a chain, or the like.
連結部材４の一端は、第一支持部２１の垂直プレート２１ａに形成された貫通孔に挿通され、垂直プレート２１ａの背面に配置されたエネルギー吸収部材６及び緩衝機構５を介してナット８により固定されている。緩衝機構５は、硬質ゴム等により形成される緩衝材５１と、緩衝材５１の背面に接続された止圧板５２と、止圧板５２の背面に配置されたコイルスプリング５３と、コイルスプリング５３の位置を固定する止め部材５４と、を有する。緩衝機構５を構成する各部品は連結部材４の一端に挿通され、ナット８により締め付けられて固定される。かかる緩衝機構５により、連結部材４が軸方向に移動した際に生じる衝撃が緩和される。特に、コイルスプリング５３は、連結部材４の大きな移動に対して作用し、緩衝材５１は、コイルスプリング５３が圧縮された際の衝撃に対して作用する。 One end of the connecting member 4 is inserted into a through hole formed in the vertical plate 21 a of the first support portion 21, and is fixed by the nut 8 via the energy absorbing member 6 and the buffer mechanism 5 disposed on the back surface of the vertical plate 21 a. Has been. The buffer mechanism 5 includes a buffer material 51 formed of hard rubber or the like, a pressure plate 52 connected to the back surface of the buffer material 51, a coil spring 53 disposed on the back surface of the pressure plate 52, and positions of the coil springs 53. And a stop member 54 for fixing. Each component constituting the buffer mechanism 5 is inserted into one end of the connecting member 4 and is fastened and fixed by a nut 8. Such shock absorbing mechanism 5 alleviates the impact that occurs when the connecting member 4 moves in the axial direction. In particular, the coil spring 53 acts on a large movement of the connecting member 4, and the cushioning material 51 acts on an impact when the coil spring 53 is compressed.
連結部材４の他端は、第二支持部３１の垂直プレート３１ａに形成された貫通孔に挿通され、垂直プレート３１ａの背面に配置された緩衝機構５´を介してナット８により固定されている。緩衝機構５´は、硬質ゴム等により形成される緩衝材５１´と、緩衝材５１´の背面に接続された止圧板５２´と、止圧板５２´の位置を固定する止め部材５４´と、を有する。緩衝機構５´を構成する各部品は連結部材４の他端に挿通され、ナット８により固定される。かかる緩衝機構５´により、連結部材４が軸方向に移動した際に生じる衝撃が緩和される。一般に、コイルスプリング５３は、緩衝機構５又は緩衝機構５´のいずれか一方に配置されていればよく、第一支持部２１側に配置されることが多い。なお、連結部材４の他端には、緩衝機構５´を覆う保護カバーを配置するようにしてもよい。 The other end of the connecting member 4 is inserted through a through hole formed in the vertical plate 31a of the second support portion 31, and is fixed by the nut 8 via a buffer mechanism 5 'disposed on the back surface of the vertical plate 31a. . The buffer mechanism 5 ′ includes a buffer material 51 ′ formed of hard rubber or the like, a pressure stop plate 52 ′ connected to the back surface of the buffer material 51 ′, a stop member 54 ′ that fixes the position of the pressure stop plate 52 ′, Have Each component constituting the buffer mechanism 5 ′ is inserted into the other end of the connecting member 4 and fixed by the nut 8. The shock that occurs when the connecting member 4 moves in the axial direction is mitigated by the buffer mechanism 5 '. In general, the coil spring 53 only needs to be disposed on either the buffer mechanism 5 or the buffer mechanism 5 ′, and is often disposed on the first support portion 21 side. A protective cover that covers the buffer mechanism 5 ′ may be disposed at the other end of the connecting member 4.
前記エネルギー吸収部材６は、緩衝機構５と第一支持部２１との間に配置されるとともに低降伏点材により形成される部材である。エネルギー吸収部材６は、例えば、図２（ａ）に示したように、低降伏点材により形成される筒部６１と、筒部６１に接続され緩衝機構５に当接する蓋部６２と、を有する。 The energy absorbing member 6 is a member that is disposed between the buffer mechanism 5 and the first support portion 21 and is formed of a low yield point material. As shown in FIG. 2A, for example, the energy absorbing member 6 includes a cylindrical portion 61 formed of a low yield point material, and a lid portion 62 that is connected to the cylindrical portion 61 and abuts against the buffer mechanism 5. Have.
筒部６１は、例えば、低降伏点鋼やアルミニウム合金等の低降伏点材により円筒状に形成される。低降伏点材は、一般構造用圧延鋼材や溶接構造用圧延鋼材に比べ降伏点が低い金属である。特に、低降伏点鋼は、添加元素を極力低減した純鉄に近い鋼材であり、従来の軟鋼と比較して強度が低く、延性が極めて高い鋼材である。かかる性質を有する低降伏点材を連結部材４の固定部に配置することにより、図２（ｂ）に示したように、第一支持部２１と緩衝機構５との間で筒部６１が塑性変形（例えば、降伏又は座屈）してダンパーとして作用し、地震エネルギーを吸収することができる。 The cylindrical portion 61 is formed in a cylindrical shape by a low yield point material such as a low yield point steel or an aluminum alloy, for example. The low yield point material is a metal having a lower yield point than the general structural rolled steel and welded structural rolled steel. In particular, the low yield point steel is a steel material close to pure iron in which additive elements are reduced as much as possible, and is a steel material having a lower strength and a higher ductility than conventional mild steel. By arranging the low yield point material having such properties in the fixed portion of the connecting member 4, the cylindrical portion 61 is plastic between the first support portion 21 and the buffer mechanism 5 as shown in FIG. It can deform (eg yield or buckle) and act as a damper to absorb seismic energy.
エネルギー吸収部材６のエネルギー吸収量は、筒部６１の材質、板厚、径の大きさ、軸方向長さ等の条件を調整することにより任意に設定することができ、例えば、レベル２地震動を超える地震動が発生した場合に塑性変形（例えば、降伏又は座屈）するように調整される。すなわち、エネルギー吸収部材６は、レベル２地震動を超える地震動が発生した場合に相当する力が作用した場合に、塑性変形して地震エネルギーを吸収する部材である。なお、筒部６１が降伏するか、座屈（例えば、屈服座屈）するかは、筒部６１の板厚に対する軸方向長さによって変化し、一般に、軸方向長さが短い場合に降伏し、長い場合に座屈することとなる。本実施形態において、降伏又は座屈を明確に区別する必要はなく、必要となるエネルギー吸収量及び筒部６１の形状から、作用しやすい方を適宜選択すればよい。 The energy absorption amount of the energy absorbing member 6 can be arbitrarily set by adjusting conditions such as the material of the cylindrical portion 61, the plate thickness, the size of the diameter, and the axial length. It is adjusted so as to be plastically deformed (for example, yielding or buckling) in the event of excessive earthquake motion. That is, the energy absorbing member 6 is a member that absorbs seismic energy by plastic deformation when a force corresponding to a seismic motion exceeding Level 2 seismic motion is applied. Whether the cylindrical part 61 yields or buckles (for example, buckling buckling) varies depending on the axial length with respect to the plate thickness of the cylindrical part 61, and generally yields when the axial length is short. If it is long, it will buckle. In the present embodiment, it is not necessary to clearly distinguish yielding or buckling, and the one that is likely to act may be selected as appropriate from the required amount of energy absorption and the shape of the cylindrical portion 61.
筒部６１の長さＬは、例えば、上部構造２及び下部構造３の桁かかり長ＳＥ（係止長さ）の０．７５倍以下に設定される。このように、筒部６１をＬ≦０．７５×ＳＥの条件を満足するように設計することにより、筒部６１が塑性変形した場合であっても、支持面３ａ上に道路橋示方書に基づく０．２５×ＳＥ以上の余裕を残した状態で、上部構造２と下部構造３との相対移動を防止し、上部構造２の下部構造３からの落下を抑制することができる。 The length L of the cylindrical part 61 is set to be 0.75 times or less the girder length S E (locking length) of the upper structure 2 and the lower structure 3, for example. Thus, by designing the cylindrical portion 61 so as to satisfy the condition L ≦ 0.75 × S E, even if the cylindrical portion 61 is plastically deformed, Specifications for Highway Bridges on the support surface 3a in 0.25 × while leaving the more margin S E based on, and prevent relative movement between the upper structure 2 and a lower structure 3, it is possible to suppress the fall of the substructure 3 of the superstructure 2.
蓋部６２は、筒部６１よりも強度が高い、一般構造用圧延鋼材や溶接構造用圧延鋼材により構成され、連結部材４を挿通する開口部を有する。蓋部６２は、緩衝機構５の緩衝材５１を支持する円板形状の部材である。かかる蓋部６２と緩衝材５１との接触により、地震等によって連結部材４に生じる力が略均等に筒部６１に伝達される。なお、蓋部６２は、筒部６１に溶接するようにしてもよい。 The lid 62 is made of a general structural rolled steel or a welded structural rolled steel having a higher strength than the cylindrical portion 61, and has an opening through which the connecting member 4 is inserted. The lid 62 is a disk-shaped member that supports the buffer material 51 of the buffer mechanism 5. Due to the contact between the lid portion 62 and the buffer material 51, the force generated in the connecting member 4 due to an earthquake or the like is transmitted to the cylindrical portion 61 substantially evenly. The lid portion 62 may be welded to the tube portion 61.
なお、図１では、エネルギー吸収部材６を第一支持部２１側に配置した場合を図示したが、第一支持部２１側に配置できないような場合には、第二支持部３１側に配置するようにしてもよい。この場合、緩衝機構５´もコイルスプリング５３を有する緩衝機構５に変更することが好ましい。 1 illustrates the case where the energy absorbing member 6 is disposed on the first support portion 21 side, but in the case where the energy absorbing member 6 cannot be disposed on the first support portion 21 side, the energy absorbing member 6 is disposed on the second support portion 31 side. You may do it. In this case, it is preferable to change the buffer mechanism 5 ′ to the buffer mechanism 5 having the coil spring 53.
前記保護部材７は、エネルギー吸収部材６及び緩衝機構５を覆うカバー部材又はキャップである。かかる保護部材７を配置することにより、少なくともエネルギー吸収部材６を風雨から保護することができ、エネルギー吸収部材６の錆びの発生や経年劣化の進行を抑制することができる。なお、エネルギー吸収部材６の表面に防錆塗料を塗布するようにしてもよい。 The protective member 7 is a cover member or cap that covers the energy absorbing member 6 and the buffer mechanism 5. By disposing such a protective member 7, at least the energy absorbing member 6 can be protected from wind and rain, and the occurrence of rusting and aged deterioration of the energy absorbing member 6 can be suppressed. In addition, you may make it apply | coat an antirust coating to the surface of the energy absorption member 6. FIG.
ここで、上述した落下防止装置１の作用について、図３を参照しつつ説明する。図３（ａ）は、地震が生じていない平常時を示している。かかる平常時は、落下防止装置１には大きな負荷が生じておらず、エネルギー吸収部材６は、図２（ａ）に示したように、塑性変形していない状態になっている。なお、説明の便宜上、橋軸方向Ｘにおいて、平常時における上部構造２の位置を原点（０地点）とする。 Here, the effect | action of the fall prevention apparatus 1 mentioned above is demonstrated, referring FIG. FIG. 3A shows a normal time when no earthquake occurs. In such a normal state, no large load is generated in the fall prevention device 1, and the energy absorbing member 6 is not plastically deformed as shown in FIG. For convenience of explanation, the position of the upper structure 2 in the normal direction in the bridge axis direction X is defined as the origin (0 point).
図３（ｂ）は、レベル１地震動が生じた状態を示している。レベル１地震動は、いわゆる中小規模の地震に相当する。レベル１地震動が生じた場合には、主として、支承３２、伸縮装置３３及び変位制限装置３４によって、地震エネルギーが吸収される。具体的には、図示したように、地震エネルギーによって、支承３２は歪み、伸縮装置３３は伸縮し、変位制限装置３４の鋼棒は上部構造２に押し付けられ、これらの作用により地震エネルギーが吸収される。また、落下防止装置１において、地震の揺れによって生じる変位Ｘ１及び衝撃は、主として、緩衝機構５のコイルスプリング５３によって吸収される。 FIG. 3B shows a state where level 1 earthquake motion has occurred. Level 1 ground motions correspond to so-called small and medium-sized earthquakes. When level 1 earthquake motion occurs, the seismic energy is absorbed mainly by the support 32, the expansion / contraction device 33, and the displacement limiting device 34. Specifically, as shown in the drawing, the support 32 is distorted by the seismic energy, the expansion / contraction device 33 expands / contracts, and the steel rod of the displacement limiting device 34 is pressed against the upper structure 2, and the seismic energy is absorbed by these actions. The Further, in the fall prevention device 1, the displacement X 1 and the impact caused by the earthquake shake are mainly absorbed by the coil spring 53 of the buffer mechanism 5.
図３（ｃ）は、レベル２地震動が生じた状態を示している。レベル２地震動は、いわゆる大規模の地震に相当する。レベル２地震動が生じた場合には、主として、支承３２、変位制限装置３４及び落下防止装置１によって、地震エネルギーが吸収される。具体的には、図示したように、地震エネルギーによって、支承３２は大きく歪み（場合によっては破壊される。）、伸縮装置３３は破壊され、変位制限装置３４の鋼棒は上部構造２に押し付けられて塑性変形し、落下防止装置１の連結部材４が上部構造２及び下部構造３の間で緊張し、これらの作用により地震エネルギーが吸収される。このとき、落下防止装置１に生じる衝撃及び変位Ｘ２は緩衝機構５，５´によって吸収される。また、レベル２地震動以下の地震では、エネルギー吸収部材６は塑性変形しないため、図３（ｃ）の状態では、エネルギー吸収部材６はまだ降伏も座屈もしていない。 FIG. 3C shows a state where level 2 earthquake motion has occurred. Level 2 ground motion corresponds to a so-called large-scale earthquake. When level 2 earthquake motion occurs, the seismic energy is absorbed mainly by the support 32, the displacement limiting device 34 and the fall prevention device 1. Specifically, as shown in the figure, the support 32 is greatly distorted (may be broken in some cases) by the seismic energy, the telescopic device 33 is broken, and the steel rod of the displacement limiting device 34 is pressed against the superstructure 2. As a result, the connecting member 4 of the fall prevention device 1 is strained between the upper structure 2 and the lower structure 3, and the seismic energy is absorbed by these actions. At this time, the impact and displacement X 2 occurring fall prevention device 1 is absorbed by the buffer mechanism 5, 5 '. Further, since the energy absorbing member 6 is not plastically deformed in an earthquake of level 2 or less, the energy absorbing member 6 has not yet yielded or buckled in the state of FIG.
図３（ｄ）は、レベル２地震動を超えるレベル３地震動が生じた状態を示している。レベル３地震動が生じた場合には、主として、落下防止装置１によって、地震エネルギーが吸収される。図示したように、地震エネルギーによって、支承３２及び変位制限装置３４はさらに大きく歪み（場合によっては破壊される。）、上部構造２が下部構造３の支持面３ａから落下しないように、落下防止装置１が作用する。すなわち、レベル３地震動が生じた場合に、エネルギー吸収部材６は、変位Ｘ２から変位Ｘ３の範囲内において、図２（ｂ）に示したように、塑性変形して地震エネルギーを吸収する。 FIG. 3D shows a state in which a level 3 earthquake motion exceeding a level 2 earthquake motion has occurred. When a level 3 earthquake motion occurs, the earthquake energy is mainly absorbed by the fall prevention device 1. As shown in the figure, the anti-falling device prevents the upper structure 2 from falling from the support surface 3a of the lower structure 3 because the bearing 32 and the displacement limiting device 34 are further greatly distorted (in some cases, destroyed) by the seismic energy. 1 works. That is, when the level 3 earthquake motion occurs, the energy-absorbing member 6 is in the range of displacement X 3 from the displacement X 2, as shown in FIG. 2 (b), to absorb the seismic energy by plastic deformation.
エネルギー吸収部材６は、図２に示したように、長さＬの範囲内で塑性変形し、それ以上の連結部材４の移動を制限する。したがって、連結部材４は、最大でも筒部６１の長さＬだけ延長された状態を維持するように構成されており、上部構造２の橋軸方向Ｘ（水平方向）の移動は変位Ｘ３に制限される。ここで、道路橋示方書によれば、（ＳＥ−Ｘ３）≧０．２５×ＳＥとなるように設計される。したがって、筒部６１の長さＬは、０．７５×ＳＥ以下となるように設定され、好ましくは、橋軸方向Ｘに投影した筒部６１の長さが０．７５×ＳＥ以下となるように設定され、さらに好ましくは、橋軸方向Ｘに投影した筒部６１の長さが（０．７５×ＳＥ−Ｘ２）以下となるように設定される。 As shown in FIG. 2, the energy absorbing member 6 is plastically deformed within the range of the length L, and restricts further movement of the connecting member 4. Accordingly, connecting member 4 is configured to maintain a state of well being extended by the length L of the cylindrical portion 61 at a maximum, the movement of the bridge axis direction X of the upper structure 2 (horizontal direction) to the displacement X 3 Limited. Here, according to the specifications for highway bridges, it is designed to be (S E -X 3) ≧ 0.25 × S E. Therefore, the length L of the cylindrical part 61 is set to be 0.75 × S E or less, and preferably the length of the cylindrical part 61 projected in the bridge axis direction X is 0.75 × S E or less. More preferably, the length of the cylindrical portion 61 projected in the bridge axis direction X is set to be (0.75 × S E −X 2 ) or less.
本実施形態に係る落下防止装置１では、低降伏点材により形成されたエネルギー吸収部材６を配置したことにより、レベル２地震動を超える地震動であっても、エネルギー吸収部材６の塑性変形によって、橋桁や橋梁等の上部構造２の落下を効果的に抑制することができる。また、エネルギー吸収部材６を筒形状に形成したことにより、エネルギー吸収部材６の変形できる軸方向の長さＬを任意に設定することができ、地震エネルギーを効果的に吸収することができ、上部構造２の落下を効果的に抑制することができる。 In the fall prevention device 1 according to the present embodiment, by arranging the energy absorbing member 6 formed of the low yield point material, the bridge girder can be obtained by plastic deformation of the energy absorbing member 6 even if the ground motion exceeds Level 2 ground motion. It is possible to effectively suppress the fall of the upper structure 2 such as a bridge or a bridge. Further, since the energy absorbing member 6 is formed in a cylindrical shape, the axial length L of the energy absorbing member 6 that can be deformed can be arbitrarily set, and seismic energy can be effectively absorbed, The fall of the structure 2 can be effectively suppressed.
上述した第一実施形態では、エネルギー吸収部材６は、レベル２地震動を超える地震動が発生した場合に相当する力が作用した場合に、塑性変形して地震エネルギーを吸収する部材であるところ、図３（ｄ）に示したように、レベル２地震動を超える地震動が発生した場合にエネルギー吸収部材６が塑性変形するように調整されている。 In the first embodiment described above, the energy absorbing member 6 is a member that plastically deforms and absorbs seismic energy when a force corresponding to a seismic motion exceeding Level 2 seismic motion is applied. As shown in (d), the energy absorbing member 6 is adjusted so as to be plastically deformed when an earthquake motion exceeding the level 2 earthquake motion occurs.
ところで、このエネルギー吸収部材６に作用する力は、コイルスプリング５３の長さ又は弾性力を調整することにより、変更することができる。例えば、第一実施形態に示したナット８を締め付けてコイルスプリング５３の長さを変更したり、長さの短いコイルスプリング５３に変更したり、第一実施形態に示したコイルスプリング５３よりも弾性力が低いものに変更したりすることにより、早い段階で緩衝機構５が効かなくなる状態にして、エネルギー吸収部材６に高い負荷をかけることができる。したがって、レベル２地震動以下の地震動が発生した場合であっても、エネルギー吸収部材６に対して、レベル２地震動を超える地震動が発生した場合に相当する力を作用させることができ、塑性変形させることができる。 By the way, the force acting on the energy absorbing member 6 can be changed by adjusting the length or elastic force of the coil spring 53. For example, the length of the coil spring 53 is changed by tightening the nut 8 shown in the first embodiment, the coil spring 53 is changed to a shorter length, or more elastic than the coil spring 53 shown in the first embodiment. By changing to a low force, it is possible to apply a high load to the energy absorbing member 6 in a state where the buffer mechanism 5 becomes ineffective at an early stage. Therefore, even when a ground motion of level 2 or less is generated, a force corresponding to the case where a ground motion exceeding the level 2 seismic motion is generated can be applied to the energy absorbing member 6 and plastic deformation is performed. Can do.
このように、レベル２地震動以下の地震動が生じた際に、エネルギー吸収部材６を塑性変形可能にした場合には、より早い段階から地震エネルギーを吸収することができ、例えば、支承３２、伸縮装置３３、変位制限装置３４等の一部を省略したり、小型化又は簡略化したり、地震動による支承３２、伸縮装置３３、変位制限装置３４等の破壊を抑制することができる。 In this way, when the energy absorbing member 6 is made plastically deformable when a seismic motion of level 2 or less is generated, seismic energy can be absorbed from an earlier stage. 33, a part of the displacement limiting device 34 or the like can be omitted, or downsized or simplified, or the breakage of the support 32, the expansion / contraction device 33, the displacement limiting device 34, or the like due to earthquake motion can be suppressed.
すなわち、本実施形態に係る落下防止装置１では、緩衝機構５はコイルスプリング５３を有し、コイルスプリング５３の長さ又は弾性力を調節することにより、レベル２地震動を超える地震動が発生した場合又はレベル２地震動以下の地震動が発生した場合に、エネルギー吸収部材６に対して塑性変形し得る力が作用するように構成されている。 That is, in the fall prevention device 1 according to the present embodiment, the buffer mechanism 5 includes the coil spring 53, and when the earthquake motion exceeding the level 2 earthquake motion is generated by adjusting the length or elastic force of the coil spring 53 or When an earthquake motion of level 2 or less is generated, a force capable of plastic deformation is applied to the energy absorbing member 6.
次に、上述したエネルギー吸収部材６の変形例について、図４を参照しつつ説明する。ここで、図４は、図１に示したエネルギー吸収部材の変形例を示す図であり、（ａ）は第一変形例、（ｂ）は第二変形例、（ｃ）は第三変形例、（ｄ）は第四変形例、を示している。なお、上述した第一実施形態と同じ構成部品については、同じ符号を付して重複した説明を省略する。 Next, a modified example of the energy absorbing member 6 described above will be described with reference to FIG. Here, FIG. 4 is a figure which shows the modification of the energy absorption member shown in FIG. 1, (a) is a 1st modification, (b) is a 2nd modification, (c) is a 3rd modification. , (D) shows a fourth modification. In addition, about the same component as 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.
図４（ａ）に示した第一変形例は、筒部６１が第一支持部２１に当接する底部６３を有するものである。かかる底部６３を配置することにより、エネルギー吸収部材６と第一支持部２１の垂直プレート２１ａとの間で広い接触面積を確保することができ、筒部６１に対して、より均等に抗力を負荷することができる。底部６３は、蓋部６２と同様に、一般構造用圧延鋼材や溶接構造用圧延鋼材により構成され、連結部材４を挿通する開口部を有する。なお、底部６３は、筒部６１に溶接するようにしてもよい。 The first modification shown in FIG. 4A has a bottom portion 63 in which the cylindrical portion 61 abuts on the first support portion 21. By disposing the bottom portion 63, a wide contact area can be ensured between the energy absorbing member 6 and the vertical plate 21a of the first support portion 21, and a drag force is applied to the cylindrical portion 61 more evenly. can do. Similarly to the lid portion 62, the bottom portion 63 is made of a general structural rolled steel material or a welded structural rolled steel material, and has an opening through which the connecting member 4 is inserted. Note that the bottom 63 may be welded to the tube 61.
図４（ｂ）に示した第二変形例は、底部６３の表面に緩衝材６４を配置したものである。底部６３及び第一支持部２１の垂直プレート２１ａは、いずれも鋼材により構成されているため、寸法誤差や歪み等により接触面が安定しない場合も想定され得る。そこで、底部６３と垂直プレート２１ａとの間に緩衝材６４を配置して、筒部６１に対して、より均等に抗力を負荷することができるようにしてもよい。緩衝材６４は、例えば、緩衝材５１と同様の硬質ゴムにより構成される。 In the second modification shown in FIG. 4B, the cushioning material 64 is disposed on the surface of the bottom 63. Since the bottom plate 63 and the vertical plate 21a of the first support portion 21 are both made of steel, it may be assumed that the contact surface is not stable due to dimensional error or distortion. Therefore, a buffer material 64 may be disposed between the bottom portion 63 and the vertical plate 21a so that the drag force can be applied to the cylindrical portion 61 more evenly. The buffer material 64 is made of, for example, hard rubber similar to the buffer material 51.
図４（ｃ）に示した第三変形例は、筒部６１が内部に同心上に配置された内筒部６５を有するものである。内筒部６５は、筒部６１よりも径が小さく、筒部６１と同心上に配置される。また、内筒部６５の板厚は、筒部６１の板厚と同じであることが好ましいが、それよりも厚くても薄くてもよい。また、筒部６１は、径の大きさの異なる複数の内筒部６５を有していてもよい。内筒部６５の径は、例えば、筒部６１の径に対して均等な間隔となるように設定される。また、内筒部６５の板厚や径の大きさは、具体的には、筒部６１が塑性変形する際に、均等に負荷がかかって所定の地震エネルギーを吸収できるように設定される。 The third modification shown in FIG. 4C has an inner cylinder portion 65 in which a cylinder portion 61 is disposed concentrically. The inner cylinder portion 65 has a smaller diameter than the cylinder portion 61 and is disposed concentrically with the cylinder portion 61. The plate thickness of the inner cylinder portion 65 is preferably the same as the plate thickness of the cylinder portion 61, but may be thicker or thinner than that. Moreover, the cylinder part 61 may have a plurality of inner cylinder parts 65 having different diameters. For example, the diameter of the inner cylinder portion 65 is set to be equal to the diameter of the cylinder portion 61. In addition, the thickness and the diameter of the inner cylinder portion 65 are specifically set so that when the cylinder portion 61 is plastically deformed, a load is evenly applied and predetermined earthquake energy can be absorbed.
図４（ｄ）に示した第四変形例は、筒部６１を多角形状に形成したものである。筒部６１は、円筒形状に限定されるものではなく、図示したような六角形状であってもよいし、四角形状、五角形状、八角形状等の多角形状であってもよい。また、図示しないが、筒部６１は、波板を筒状に形成したものであってもよい。 In the fourth modification shown in FIG. 4D, the cylindrical portion 61 is formed in a polygonal shape. The cylindrical portion 61 is not limited to a cylindrical shape, and may be a hexagonal shape as illustrated, or may be a polygonal shape such as a quadrangular shape, a pentagonal shape, or an octagonal shape. Moreover, although not shown in figure, the cylinder part 61 may form the corrugated sheet in the cylinder shape.
次に、上述した落下防止装置１の他の実施形態について説明する。ここで、図５は、本発明の第二実施形態に係る落下防止装置を示す図であり、（ａ）は部分拡大図、（ｂ）はスペーサの変形例、（ｃ）は図５（ｂ）におけるＣ−Ｃ断面矢視図、を示している。図６は、本発明の第三実施形態に係る落下防止装置を示す図であり、（ａ）は全体構成図、（ｂ）は変形例、を示している。なお、上述した第一実施形態と同じ構成部品については、同じ符号を付して重複した説明を省略する。 Next, another embodiment of the above-described fall prevention device 1 will be described. Here, FIG. 5 is a figure which shows the fall prevention apparatus which concerns on 2nd embodiment of this invention, (a) is a partial enlarged view, (b) is a modified example of a spacer, (c) is FIG. CC cross-sectional arrow view in FIG. FIGS. 6A and 6B are diagrams showing a fall prevention device according to the third embodiment of the present invention, in which FIG. 6A shows the entire configuration, and FIG. 6B shows a modification. In addition, about the same component as 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.
図５（ａ）に示した第二実施形態は、連結部材４の長さを延長する延長部材４１と、延長部材４１及び連結部材４を連結する結合部材４２と、連結部材４の延長部分に挿通されるスペーサ４３と、を有する。かかる第二実施形態は、エネルギー吸収部材６を配置する際に連結部材４の長さが不足する場合に適用される。 The second embodiment shown in FIG. 5A includes an extension member 41 that extends the length of the connecting member 4, a connecting member 42 that connects the extending member 41 and the connecting member 4, and an extended portion of the connecting member 4. And a spacer 43 to be inserted. This second embodiment is applied when the length of the connecting member 4 is insufficient when the energy absorbing member 6 is arranged.
延長部材４１は、例えば、鋼棒又は連結部材４と同じＰＣケーブルにより構成される。結合部材４２は、例えば、両端部に螺子穴が形成されたカプラーであり、一端に連結部材４が螺合され、他端に延長部材４１が螺合される。また、結合部材４２は、延長部材４１に予め接続された定着部であってもよい。 The extension member 41 is configured by, for example, a steel rod or the same PC cable as the connection member 4. The coupling member 42 is, for example, a coupler in which screw holes are formed at both ends, the connecting member 4 is screwed at one end, and the extension member 41 is screwed at the other end. Further, the coupling member 42 may be a fixing unit connected in advance to the extension member 41.
かかる延長部材４１及び結合部材４２により、連結部材４の長さを延長した場合、コイルスプリング５３だけでは延長部分を埋めることはできないため、スペーサ４３を使用する。スペーサ４３は、略円筒形状を有し、例えば、止圧板５２とコイルスプリング５３との間に配置される。図５（ａ）に示したスペーサ４３は、コイルスプリング５３が配置される側に蓋部４３ａを有し、コイルスプリング５３を支持できるように構成されている。一方、止圧板５２が配置される側は、止圧板５２が円板形状を有するため、蓋部を配置する必要はないが、スペーサ４３の強度等を考慮して蓋部を設けるようにしてもよい。また、スペーサ４３の周面には、開口部４３ｂが形成されている。開口部４３ｂを形成することにより、開口部４３ｂを介して、結合部材４２の着脱作業を行うことができる。 When the length of the connecting member 4 is extended by the extension member 41 and the coupling member 42, the extension portion cannot be filled with the coil spring 53 alone, and therefore the spacer 43 is used. The spacer 43 has a substantially cylindrical shape, and is disposed, for example, between the pressure stop plate 52 and the coil spring 53. The spacer 43 shown in FIG. 5A has a lid portion 43 a on the side where the coil spring 53 is disposed, and is configured to support the coil spring 53. On the other hand, on the side on which the pressure stop plate 52 is arranged, the pressure stop plate 52 has a disk shape, so there is no need to place a cover portion. However, the cover portion may be provided in consideration of the strength of the spacer 43 and the like. Good. An opening 43 b is formed on the peripheral surface of the spacer 43. By forming the opening 43b, the coupling member 42 can be attached and detached through the opening 43b.
図５（ｂ）及び（ｃ）にスペーサ４３の変形例を示す。かかるスペーサ４３は、両端に配置された蓋部４３ａと、蓋部４３ａの間に配置された複数の柱状部材４３ｃと、を有する。かかる構成によっても、図５（ａ）と同様に、開口部４３ｂを有するスペーサ４３を形成することができる。かかるスペーサ４３は、いわゆるラムチェアー（台座又は受台）と称することもできる。 5B and 5C show a modification of the spacer 43. FIG. The spacer 43 includes a lid portion 43a disposed at both ends, and a plurality of columnar members 43c disposed between the lid portions 43a. Also with this configuration, the spacer 43 having the opening 43b can be formed as in FIG. The spacer 43 can also be called a so-called ram chair (pedestal or cradle).
上述した第二実施形態に係る落下防止装置１では、第一実施形態と同様の効果を奏するとともに、例えば、既設の落下防止装置１において、連結部材４にエネルギー吸収部材６を配置する余裕がない場合であっても、延長部材４１によって連結部材４を延長することができ、エネルギー吸収部材６を配置する余裕を形成することができる。 The fall prevention device 1 according to the second embodiment described above has the same effects as the first embodiment, and, for example, in the existing fall prevention device 1, there is no room for disposing the energy absorbing member 6 on the connecting member 4. Even if it is a case, the connection member 4 can be extended by the extension member 41, and the margin which arrange | positions the energy absorption member 6 can be formed.
図６に示した第三実施形態は、第一支持部２１が、上部構造２に接続される固定部２２と、固定部２２に回動可能に接続された揺動部２３と、を有し、揺動部２３に連結部材４が接続されたものである。その他の構成（例えば、緩衝機構５やエネルギー吸収部材６等）については、第一実施形態と同様であるため、詳細な説明を省略する。揺動部２３は、固定部２２にピン結合されており、図示したように、橋軸方向に回動可能に構成されている。なお、ピン結合に替えて、ユニバーサルジョイント等を利用してもよい。 In the third embodiment shown in FIG. 6, the first support portion 21 includes a fixing portion 22 connected to the upper structure 2 and a swinging portion 23 connected to the fixing portion 22 so as to be rotatable. The connecting member 4 is connected to the swing part 23. Since other configurations (for example, the buffer mechanism 5 and the energy absorbing member 6) are the same as those in the first embodiment, detailed description thereof is omitted. The swing part 23 is pin-coupled to the fixed part 22 and is configured to be rotatable in the bridge axis direction as shown in the figure. A universal joint or the like may be used instead of the pin connection.
ここで、図７は、図６（ａ）に示した落下防止装置の据付方法を示す図であり、（ａ）は支持部設置工程、（ｂ）は第一支持部挿通工程、（ｃ）は第二支持部挿通工程、（ｄ）連結部材固定工程、を示している。 Here, FIG. 7 is a figure which shows the installation method of the fall prevention apparatus shown to Fig.6 (a), (a) is a support part installation process, (b) is a 1st support part insertion process, (c). These show the 2nd support part insertion process, (d) Connecting member fixing process.
図７（ａ）に示した支持部設置工程は、第一支持部２１を上部構造２に設置し、第二支持部３１を下部構造３に設置する工程である。このとき、第一支持部２１は、重力により、揺動部２３が固定部２２に対して釣り合いが取れた状態（例えば、略水平状態）になっている。なお、第一支持部２１及び第二支持部３１を固定するアンカーの図は省略してある。 The support part installation process shown in FIG. 7A is a process of installing the first support part 21 in the upper structure 2 and installing the second support part 31 in the lower structure 3. At this time, the first support portion 21 is in a state (for example, a substantially horizontal state) in which the swinging portion 23 is balanced with the fixed portion 22 due to gravity. In addition, the figure of the anchor which fixes the 1st support part 21 and the 2nd support part 31 is abbreviate | omitted.
図７（ｂ）に示した第一支持部挿通工程は、第一支持部２１の揺動部２３に連結部材４の一端を挿通する工程である。連結部材４は、第一支持部２１の揺動部２３に第二支持部３１側から挿通される。このとき、揺動部２３は、固定部２２に対して回動可能であるため、任意の角度に変更することができる。したがって、例えば、図１に示した第一支持部２１と上部構造２との間に連結部材４を引き込む余裕がない場合であっても、第三実施形態を採用することにより、図７（ｂ）に示したように、揺動部２３を略水平にした状態で連結部材４の一端を挿通して引き込むことができる。 The first support portion insertion step shown in FIG. 7B is a step of inserting one end of the connecting member 4 into the swinging portion 23 of the first support portion 21. The connecting member 4 is inserted into the swinging portion 23 of the first support portion 21 from the second support portion 31 side. At this time, the oscillating portion 23 can be rotated to the fixed portion 22 and thus can be changed to an arbitrary angle. Therefore, for example, even when there is no room for drawing the connecting member 4 between the first support portion 21 and the upper structure 2 shown in FIG. 1, by adopting the third embodiment, FIG. ), The connecting member 4 can be inserted through one end of the connecting member 4 with the swinging portion 23 being substantially horizontal.
また、図１に示した第一支持部２１では、垂直プレート２１ａが連結部材４に対して垂直となるように位置決めする必要があるが、第三実施形態における第一支持部２１によれば、揺動部２３が任意の角度に回動できるため、かかる位置決めをする必要がなく、容易に第一支持部２１を設置することができる。 Further, in the first support portion 21 shown in FIG. 1, it is necessary to position the vertical plate 21a so as to be perpendicular to the connecting member 4, but according to the first support portion 21 in the third embodiment, Since the oscillating portion 23 can be rotated at an arbitrary angle, it is not necessary to perform such positioning, and the first support portion 21 can be easily installed.
図７（ｃ）に示した第二支持部挿通工程は、第二支持部３１に連結部材４の他端を挿通する工程である。連結部材４は、第二支持部３１の垂直プレート３１ａに形成された貫通孔に第一支持部２１側から挿通される。このとき、第一支持部２１の揺動部２３は任意に回動させることができるため、連結部材４を第一支持部２１に挿通した状態で、容易に連結部材４の他端を第二支持部３１の垂直プレート３１ａに挿通することができる。 The second support portion insertion step shown in FIG. 7C is a step of inserting the other end of the connecting member 4 into the second support portion 31. The connecting member 4 is inserted from the first support portion 21 side into a through hole formed in the vertical plate 31 a of the second support portion 31. At this time, since the swinging portion 23 of the first support portion 21 can be arbitrarily rotated, the other end of the connection member 4 can be easily moved to the second position while the connection member 4 is inserted into the first support portion 21. It can be inserted into the vertical plate 31 a of the support portion 31.
図７（ｄ）に示した連結部材固定工程は、連結部材４を第一支持部２１及び第二支持部３１に固定する工程である。連結部材４の第一支持部２１側の端部には、エネルギー吸収部材６及び緩衝機構５が挿通され、ナット８が締め付けられて固定される。その後、エネルギー吸収部材６及び緩衝機構５を覆う保護部材７が第一支持部２１に固定される。また、連結部材４の第二支持部３１側の端部には、緩衝機構５´が挿通され、ナット８が締め付けられて固定される。 The connecting member fixing step shown in FIG. 7D is a step of fixing the connecting member 4 to the first support portion 21 and the second support portion 31. The energy absorbing member 6 and the buffer mechanism 5 are inserted into the end portion of the connecting member 4 on the first support portion 21 side, and the nut 8 is fastened and fixed. Thereafter, the protective member 7 covering the energy absorbing member 6 and the buffer mechanism 5 is fixed to the first support portion 21. Further, a buffer mechanism 5 ′ is inserted into the end of the connecting member 4 on the second support portion 31 side, and the nut 8 is fastened and fixed.
また、図６（ｂ）に示した第三実施形態の変形例のように、第二支持部３１をユニバーサルジョイント等により回動可能に構成するようにしてもよい。かかる構成により、図１に示した第二支持部３１の垂直プレート３１ａの位置決めをする必要がなく、容易に第二支持部３１を設置することができ、容易に連結部材４を接続することができる。具体的には、第二支持部３１は、下部構造３に接続される固定部３５と、固定部３５に回動可能に接続された揺動部３６と、を有し、揺動部３６に連結部材４が接続される。揺動部３６は、ユニバーサルジョイント等の自在継手により固定部３５に接続されており、上下方向及び左右方向に任意に回動できるように構成される。かかる構成により、連結部材４の角度や第一支持部２１と第二支持部３１との橋幅方向のズレを容易に吸収することができる。 Moreover, you may make it comprise the 2nd support part 31 so that rotation is possible by a universal joint etc. like the modification of 3rd embodiment shown in FIG.6 (b). With this configuration, it is not necessary to position the vertical plate 31a of the second support portion 31 shown in FIG. 1, the second support portion 31 can be easily installed, and the connecting member 4 can be easily connected. it can. Specifically, the second support portion 31 has a fixed portion 35 connected to the lower structure 3 and a swinging portion 36 rotatably connected to the fixed portion 35. The connecting member 4 is connected. The oscillating portion 36 is connected to the fixed portion 35 by a universal joint such as a universal joint, and is configured to be arbitrarily rotatable in the vertical direction and the horizontal direction. With this configuration, the angle of the connecting member 4 and the shift in the bridge width direction between the first support portion 21 and the second support portion 31 can be easily absorbed.
なお、図６（ｂ）に示した第三実施形態の変形例では、緩衝機構５´を図示していないが、緩衝機構５´は、揺動部３６と連結部材４との接続部に配置してもよいし、固定部３５と揺動部３６との接続部に配置してもよいし、緩衝機構５´の機能を第一支持部２１側の緩衝機構５に持たせるようにしてもよい。 In the modification of the third embodiment shown in FIG. 6B, the buffer mechanism 5 ′ is not shown, but the buffer mechanism 5 ′ is disposed at the connection portion between the swinging portion 36 and the connecting member 4. Alternatively, it may be arranged at the connecting portion between the fixed portion 35 and the swinging portion 36, or the buffer mechanism 5 on the first support portion 21 side may have the function of the buffer mechanism 5 '. Good.
本発明は上述した実施形態に限定されず、橋以外の陸上構造物や海上構造物にも適用することができる等、本発明の趣旨を逸脱しない範囲で種々変更が可能であることは勿論である。 The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, such as being applicable to land structures other than bridges and offshore structures. is there.
１ 落下防止装置
２ 上部構造
３ 下部構造
４ 連結部材
５，５´ 緩衝機構
６ エネルギー吸収部材
７ 保護部材
２１ 第一支持部
２２ 固定部
２３ 揺動部
３１ 第二支持部
４１ 延長部材
４２ 結合部材
４３ スペーサ
５３ コイルスプリング
６１ 筒部
６２ 蓋部
６３ 底部
６５ 内筒部
DESCRIPTION OF SYMBOLS 1 Fall prevention device 2 Upper structure 3 Lower structure 4 Connecting member 5, 5 'Buffer mechanism 6 Energy absorption member 7 Protection member 21 First support part 22 Fixing part 23 Swing part 31 Second support part 41 Extension member 42 Coupling member 43 Spacer 53 Coil spring 61 Cylinder part 62 Lid part 63 Bottom part 65 Inner cylinder part
本発明によれば、一端が上部構造に接続され、他端が下部構造に接続され、前記上部構造の前記下部構造からの落下を防止する落下防止装置であって、前記上部構造に接続される第一支持部と、前記下部構造に接続される第二支持部と、前記第一支持部及び前記第二支持部に接続される連結部材と、該連結部材の両端に配置され前記連結部材の位置を固定するとともに衝撃を緩和する緩衝機構と、該緩衝機構と前記第一支持部又は前記第二支持部との間に配置されるエネルギー吸収部材と、該エネルギー吸収部材及び前記緩衝機構を覆う保護部材と、を備え、前記緩衝機構は、前記連結部材の端部に配置された緩衝材と、該緩衝材の背面に配置されたコイルスプリングと、を有し、前記エネルギー吸収部材は、低降伏点金属により形成される筒部と、該筒部に接続され前記緩衝材に当接する蓋部と、を有する、ことを特徴とする落下防止装置が提供される。 According to the present invention, there is provided a fall prevention device for preventing a fall of the upper structure from the lower structure, one end of which is connected to the upper structure and the other end of which is connected to the lower structure. A first support part; a second support part connected to the lower structure; a connecting member connected to the first support part and the second support part; and disposed at both ends of the connecting member. A buffer mechanism for fixing a position and reducing an impact, an energy absorbing member disposed between the buffer mechanism and the first support part or the second support part, and covering the energy absorbing member and the buffer mechanism A buffer member disposed on an end portion of the coupling member, and a coil spring disposed on a back surface of the buffer member, and the energy absorbing member is a low It is formed by the yield point metal And parts, are connected to the tubular portion having a lid portion in contact with the buffer material, fall prevention device is provided, characterized in that.
前記コイルスプリングの長さ又は弾性力を調節することにより、レベル２地震動を超える地震動が発生した場合又はレベル２地震動以下の地震動が発生した場合に、前記エネルギー吸収部材に対して塑性変形し得る力が作用するように構成してもよい。 By adjusting the length or elastic force of the coil spring, a force capable of plastically deforming the energy absorbing member when an earthquake motion exceeding a level 2 earthquake motion or an earthquake motion of a level 2 earthquake motion or less occurs. You may comprise so that may act.
上述した本発明に係る落下防止装置によれば、低降伏点金属により形成されたエネルギー吸収部材を緩衝機構と第一支持部又は第二支持部との間に配置したことにより、レベル２地震動を超える地震動であっても、エネルギー吸収部材の塑性変形によって、橋桁や橋梁等の上部構造の落下を効果的に抑制することができる。また、エネルギー吸収部材を筒形状に形成したことにより、エネルギー吸収部材の変形できる軸方向の長さを任意に設定することができ、地震エネルギーを効果的に吸収することができる。また、エネルギー吸収部材を保護部材の中に封入したことにより、エネルギー吸収部材を風雨から保護することができ、錆びの発生を抑制し、経年劣化の進行を抑制することができる。 According to the above-described fall prevention device according to the present invention, the energy absorbing member formed of the low yield point metal is disposed between the buffer mechanism and the first support portion or the second support portion, so that level 2 earthquake motion can be generated. Even if the earthquake motion exceeds, it is possible to effectively suppress the fall of the superstructure such as the bridge girder and the bridge by the plastic deformation of the energy absorbing member. Moreover, since the energy absorbing member is formed in a cylindrical shape, the axial length in which the energy absorbing member can be deformed can be arbitrarily set, and seismic energy can be effectively absorbed. Moreover, by enclosing the energy absorbing member in the protective member, the energy absorbing member can be protected from wind and rain, the occurrence of rust can be suppressed, and the progress of aging can be suppressed.
本発明の第一実施形態に係る落下防止装置１は、図１及び図２に示したように、一端が上部構造２に接続され、他端が下部構造３に接続され、上部構造２の下部構造３からの落下を防止する落下防止装置であって、上部構造２に接続される第一支持部２１と、下部構造３に接続される第二支持部３１と、第一支持部２１及び第二支持部３１に接続される連結部材４と、連結部材４の両端に配置され連結部材４の位置を固定するとともに衝撃を緩和する緩衝機構５と、緩衝機構５と第一支持部２１との間に配置されるエネルギー吸収部材６と、エネルギー吸収部材６及び緩衝機構５を覆う保護部材７と、を備え、エネルギー吸収部材６は、低降伏点金属により形成される筒部６１と、筒部６１に接続され緩衝機構５に当接する蓋部６２と、を有する。 As shown in FIGS. 1 and 2, the fall prevention device 1 according to the first embodiment of the present invention has one end connected to the upper structure 2 and the other end connected to the lower structure 3. A fall prevention device for preventing a fall from the structure 3, the first support portion 21 connected to the upper structure 2, the second support portion 31 connected to the lower structure 3, the first support portion 21 and the first support portion 21. A connecting member 4 connected to the two support portions 31; a buffer mechanism 5 that is disposed at both ends of the connecting member 4 to fix the position of the connecting member 4 and relieve shock; and the buffer mechanism 5 and the first support portion 21 An energy absorbing member 6 disposed between them, and a protective member 7 covering the energy absorbing member 6 and the buffer mechanism 5, and the energy absorbing member 6 includes a cylindrical portion 61 formed of a low yield point metal, and a cylindrical portion A lid 62 connected to 61 and abutting against the buffer mechanism 5. That.
前記エネルギー吸収部材６は、緩衝機構５と第一支持部２１との間に配置されるとともに低降伏点金属により形成される部材である。エネルギー吸収部材６は、例えば、図２（ａ）に示したように、低降伏点金属により形成される筒部６１と、筒部６１に接続され緩衝機構５に当接する蓋部６２と、を有する。 The energy absorbing member 6 is a member that is disposed between the buffer mechanism 5 and the first support portion 21 and is formed of a low yield point metal . As shown in FIG. 2A, for example, the energy absorbing member 6 includes a cylindrical portion 61 formed of a low yield point metal and a lid portion 62 that is connected to the cylindrical portion 61 and contacts the buffer mechanism 5. Have.
筒部６１は、例えば、低降伏点鋼やアルミニウム合金等の低降伏点金属により円筒状に形成される。低降伏点金属は、一般構造用圧延鋼材や溶接構造用圧延鋼材に比べ降伏点が低い金属である。特に、低降伏点鋼は、添加元素を極力低減した純鉄に近い鋼材であり、従来の軟鋼と比較して強度が低く、延性が極めて高い鋼材である。かかる性質を有する低降伏点金属を連結部材４の固定部に配置することにより、図２（ｂ）に示したように、第一支持部２１と緩衝機構５との間で筒部６１が塑性変形（例えば、降伏又は座屈）してダンパーとして作用し、地震エネルギーを吸収することができる。 The cylindrical portion 61 is formed in a cylindrical shape by a low yield point metal such as a low yield point steel or an aluminum alloy, for example. The low yield point metal is a metal having a lower yield point than the general structural rolled steel and welded rolled steel. In particular, the low yield point steel is a steel material close to pure iron in which additive elements are reduced as much as possible, and is a steel material having a low strength and extremely high ductility compared to conventional mild steel. By arranging the low yield point metal having such properties in the fixed portion of the connecting member 4, as shown in FIG. 2 (b), the cylindrical portion 61 is plastic between the first support portion 21 and the buffer mechanism 5. It can deform (eg yield or buckle) and act as a damper to absorb seismic energy.
本実施形態に係る落下防止装置１では、低降伏点金属により形成されたエネルギー吸収部材６を配置したことにより、レベル２地震動を超える地震動であっても、エネルギー吸収部材６の塑性変形によって、橋桁や橋梁等の上部構造２の落下を効果的に抑制することができる。また、エネルギー吸収部材６を筒形状に形成したことにより、エネルギー吸収部材６の変形できる軸方向の長さＬを任意に設定することができ、地震エネルギーを効果的に吸収することができ、上部構造２の落下を効果的に抑制することができる。 In the fall prevention device 1 according to the present embodiment, by arranging the energy absorbing member 6 formed of a low yield point metal , the bridge girder is caused by the plastic deformation of the energy absorbing member 6 even if the earthquake motion exceeds the level 2 earthquake motion. It is possible to effectively suppress the fall of the upper structure 2 such as a bridge or a bridge. Further, since the energy absorbing member 6 is formed in a cylindrical shape, the axial length L of the energy absorbing member 6 that can be deformed can be arbitrarily set, and seismic energy can be effectively absorbed, The fall of the structure 2 can be effectively suppressed.
Claims (8)
前記上部構造に接続される第一支持部と、前記下部構造に接続される第二支持部と、前記第一支持部及び前記第二支持部に接続される連結部材と、該連結部材の両端に配置され前記連結部材の位置を固定するとともに衝撃を緩和する緩衝機構と、該緩衝機構と前記第一支持部又は前記第二支持部との間に配置されるエネルギー吸収部材と、該エネルギー吸収部材及び前記緩衝機構を覆う保護部材と、を備え、
前記エネルギー吸収部材は、低降伏点材により形成される筒部と、該筒部に接続され前記緩衝機構に当接する蓋部と、を有する、
ことを特徴とする落下防止装置。 One end is connected to the upper structure, the other end is connected to the lower structure, and the fall prevention device prevents the upper structure from falling from the lower structure,
A first support portion connected to the upper structure; a second support portion connected to the lower structure; a connecting member connected to the first support portion and the second support portion; and both ends of the connecting member A buffer mechanism for fixing the position of the connecting member and mitigating an impact, an energy absorbing member disposed between the buffer mechanism and the first support portion or the second support portion, and the energy absorption A protective member covering the member and the buffer mechanism,
The energy absorbing member includes a cylindrical portion formed of a low yield point material, and a lid portion that is connected to the cylindrical portion and contacts the buffer mechanism.
A fall prevention device characterized by that.
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| CN105507135A (en) * | 2016-01-29 | 2016-04-20 | 石家庄铁道大学 | Seismic isolation control method having anti-girder-falling and anti-collision functions and seismic isolation control structure |
| CN107100118A (en) * | 2017-04-08 | 2017-08-29 | 郑华 | A kind of bridge pier fastening device of good buffer effect |
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