JP4468975B2 - Fall bridge prevention device - Google Patents

Description

  The present invention relates to a falling bridge prevention device in which a bridge pier and an end of a bridge girder supported on the pier are connected by a retaining chain, and more particularly to a falling bridge prevention device in which an element linked to the retaining chain has a buffering effect.

  Conventionally, as shown in FIGS. 1A and 1B, a fallen bridge prevention apparatus in which a bridge pier (including an abutment) 1 and a bridge girder 2 supported on the bridge pier 1 are connected by a draw chain 3 is widely used. Yes. This falling bridge prevention device embeds the full length or partial length of the retaining chain 3 in a cushioning material 4 such as rubber, and the loosened state (relaxed portion 6) of each link (ring) 5 constituting the retaining chain 3 in the cushioning material 4. ) Is formed, and when a tensile force is applied to the retaining chain 3, a buffering mechanism that exhibits a buffering effect within the range of the link relaxation dimension S of each link 5 is employed.

  However, in the falling bridge prevention device that is retained by the retaining chain 3 shown in FIG. 1, when the tension is applied to the relaxed retaining chain 3 and is stretched, it is separated from the cushioning material 4 to reduce the buffering effect. The buffer relaxation effect can be obtained only in a range limited to the link relaxation dimension S.

  Further, the buffer material is not densely filled in the link slack portion 6 of the retaining chain, and there is a problem that a nest is formed and the buffer effect in the slack dimension S is reduced.

  The present invention provides a falling bridge prevention device in which a bridge pier and a bridge girder end supported on the pier are connected by a retaining chain, and includes a shock absorber linked to the retaining chain, and the shock absorber is applied by a tensile force applied to the retaining chain. It has a configuration for compressing a buffer material that is held, and the buffer device is formed as a link element of a retaining chain.

  This greatly improves the shock-absorbing stroke limited to the loose dimensions of each link of the chain in the method of embedding a known chain in the shock-absorbing material, and further, the shock-absorbing material peels off as the chain stretches, reducing the buffering effect. Can effectively solve the problem.

  In the shock absorber, a shock absorber is held in a shock absorber holder, the shock absorber held in the shock absorber holder is interposed between a pressure receiving seat and a pressure seat, and the pressure seat is linked to the draw chain, or the pressure is applied. The pressure seat is linked to a mounting bracket on the bridge pier side or the bridge girder side, and a tension force applied to the retaining chain is applied to the pressure seat to compress the cushioning material with the pressure receiving seat.

  As a specific example of the cushioning material holder, the pressure receiving seat and the U-shape are configured by a known swivel including a ring seat and U-shaped links raised from both ends of the diameter line of the ring seat, and supported by the ring seat. The cushioning material of the above-mentioned laminated structure or non-laminated structure is interposed between the pressure seats movably arranged in the link, and the pressure seat is linked to the retaining chain or the mounting bracket on the pier side or the mounting bracket on the bridge girder side.

  As another specific example of the cushioning material holder, a pressure receiving seat formed by a box-shaped case including a pair of end plates and at least a pair of side plates provided between the both end plates, or formed by the end plates of the box-shaped case or The cushioning material is interposed between a pressure receiving seat supported on the end plate and a pressure seat movably disposed between the side plates, and the pressure seat is used for attaching a retaining chain or a pier side mounting bracket or a bridge girder side. Link to the bracket.

  The buffer material has a structure in which buffer plates are stacked or a single block structure in which the buffer plates are not stacked.

  As described above, the falling bridge prevention device that is retained by the retaining chain shown in FIG. 1 has a problem in that when the tension is applied to the relaxed retaining chain and is stretched, it peels off from the cushioning material and reduces the buffering effect. According to the invention, while utilizing the link coupling structure of the retaining chain, the phenomenon of causing skin separation from the buffer material when the chain is extended is solved, and the problem of losing the buffer effect due to the peeling in the preceding example is drastically solved. be able to.

  1 has a problem that a buffering effect can be obtained only in a range limited to the link loosening dimension of the retaining chain. According to the present invention, the link coupling of the retaining chain is present. While utilizing the structure, the compression stroke can be greatly increased and the buffering effect can be improved.

  Further, the problem in the above-mentioned prior example, in which the buffer material is not densely filled in the link slack portion of the drawing chain and a nest is formed and the buffering effect in the slack dimension is lost, can be effectively solved.

  The best mode for carrying out the present invention will be described in detail below with reference to FIGS.

  The detention chain 3 used as a fallen bridge preventing means in the present invention has a structure in which links (rings) 5 are passed through to form a chain.

  As shown in FIG. 2 and FIG. 3, the falling bridge prevention apparatus according to the present invention connects the bridge pier 1 and the bridge girder 2 end supported on the pier 1 with the draw chain 3 to draw the bridge girder 2 to the pier 1. Has a basic structure.

  The retaining chain 3 that connects the bridge pier (including the abutment) 1 and the bridge girder 2 is provided with a shock absorber 7 that is linked to the retaining chain 3. That is, while the shock absorber 7 is formed as a link element of the retaining chain 3, the shock absorbing material 8 held by the shock absorber 7 serving as the link element is compressed by a tensile force applied to the retaining chain 3 to obtain a shock absorbing effect. .

  As shown in FIGS. 4 to 7, as a specific example of the shock absorber 7, a shock absorber holder 9 that holds a shock absorber 8 is provided, and the shock absorber 8 held in the shock absorber holder 9 is added to the pressure receiving seat 10. It is interposed between the pressure seats 11, the pressure seat 11 is linked to the retaining chain 3, or the pressure seat 11 is linked to the mounting bracket 12 on the pier 1 side or the bridge girder 2 side, and added to the retaining chain 3. A configuration is adopted in which a tensile force is applied to the pressure seat 11 to compress the cushioning material 8 with the pressure receiving seat 10.

  As shown in FIG. 2, the shock absorber 7 is link-coupled in the middle of the extending length of the retaining chain 3, and both ends of the retaining chain 3 are linked to the bridge pier 1 and the bridge girder 2, respectively.

  Alternatively, as shown in FIG. 3, when the buffer device 7 is linked to one end or both ends of the retaining chain 3 and the buffer device 7 is linked to one end of the retaining chain 3, the other end of the retaining chain 3 is connected to the pier 1. (Or the bridge girder 2) and the shock absorber 7 are linked to the bridge girder 2 (or pier 1).

  As a specific example of the cushioning material holder 9, a known swivel 9A shown in FIGS. 4A and 4B is used. The swivel 9A has a ring seat 13 and U-shaped links 14 raised from both ends of the diameter line of the ring seat 13, and the pressure receiving seat 10 supported on the ring seat 13 and the U-shaped link 14 The cushioning material 8 is interposed between the pressure seats 11 that are movably disposed in the frame, and the pressure seat 11 is linked to the retaining chain 3 or the mounting bracket 12 on the pier 1 side or the mounting bracket 12 on the bridge girder 2 side. .

  As a specific example of the link coupling of the pressure seat 11, a link joint in which a link (ring) 16 is integrally provided at one end of the coupling rod 15 is used, and the coupling rod 15 is loosely inserted into the ring seat 13 and the pressure receiving seat 10. The pressure seat 11 is integrally coupled. For example, the end of the connecting rod 15 is inserted into the pressure seat 11, and a nut 17 is screwed to the projecting end from the pressure seat 11 and fastened. Further, the link 16 of the link joint is linked to the retaining chain 3 or the mounting bracket 12 on the pier 1 side or the mounting bracket 12 on the bridge girder 2 side through or without a known shackle 18.

  When the shock absorber 7 is interposed in the middle of the retaining chain 3 as shown in FIG. 2, the link 16 of the link joint is connected to one or the other retaining chain portion separated by the intervention via a shackle 18. Alternatively, the link is coupled without being interposed, and is linked with the pressure seat 11, and the U-shaped link 14 of the swivel 9A is linked to the other or one of the retaining chain portions via or without the shackle 18.

  When the shock absorber 7 is linked to the end of the retaining chain 3 as shown in FIG. 3, the link 16 of the link joint is linked to the retaining chain 3 and linked to the pressure seat 11, and the U-shape. The link 14 is linked to the mounting bracket 12 attached to the pier 1 or the bridge girder 2.

  Alternatively, the link 16 of the link joint is linked to the mounting bracket 12 on the pier 1 side or the bridge girder 2 side and linked to the pressure seat 11, and the U-shaped link 14 is linked to the draw chain 3.

  As another specific example of the cushioning material holder 9, as shown in FIG. 5, it is constituted by a box-shaped case 9B comprising a pair of end plates 19 and at least a pair of side plates 20 provided between the both end plates 19, The cushioning material 8 is interposed between the pressure receiving seat 10 formed by the end plate 19 of the box-shaped case 9B or the pressure receiving seat 10 supported on the end plate 19 and the pressure seat 11 movably disposed between the side plates 20. Then, the pressure seat 11 is linked to the retaining chain 3 or the mounting bracket 12 on the pier 1 side or the mounting bracket 12 on the bridge girder 2 side.

  As a specific example of the link coupling of the pressure seat 11, a link joint in which a link (ring) 16 is integrally provided at one end of the connecting rod 15 is used as described above, and the connecting rod 15 is connected to the end plate 19 of the box-shaped case 9B. The pressure receiving seat 10 is loosely inserted and integrally joined to the pressure seat 11. For example, the end of the connecting rod 15 is inserted into the pressure seat 11, and a nut 17 is screwed to the projecting end from the pressure seat 11 and fastened. Further, the link 16 of the link joint is linked to the retaining chain 3 or the mounting bracket 12 on the pier 1 side or the mounting bracket 12 on the bridge girder 2 side through or without a known shackle 18.

  When the shock absorber 7 is interposed in the middle of the retaining chain 3 as shown in FIG. 2, the link 16 of the link joint is connected to one or the other retaining chain portion separated by the intervention via a shackle 18. Alternatively, the link 14 is linked without being interposed, and is linked with the pressure seat 11, and the link 14 attached to the other end plate 19 of the box-shaped case 9B is connected to the other or one of the retaining chains via the shackle 18 or not. Link to the part.

  When the shock absorber 7 is linked to the end of the retaining chain 3 as shown in FIG. 3, the link 16 of the link joint is linked to the retaining chain 3 to be linked to the pressure seat 11, and the link. 14 is linked to the mounting bracket 12 attached to the pier 1 or the bridge girder 2.

  Alternatively, the link 16 of the link joint is linked to the mounting bracket 12 on the pier 1 side or the bridge girder 2 side to be linked to the pressure seat 11 and the link 14 is linked to the draw chain 3.

  As another specific example of the buffer material holder 9, as shown in FIG. 6, the holder 9 is constituted by a cylindrical case 9C, and the pressure receiving seat 10 or the end plate 19 formed by the end plate 19 of the cylindrical case 9C. The cushioning material 8 is interposed between the pressure receiving seat 10 supported above and the pressure seat 11 movably arranged in the cylindrical body 22, and the pressure seat 11 is attached to the retaining chain 3 or the mounting bracket 12 on the pier 1 side. A link connection with the mounting bracket 12 on the bridge girder 2 side is attempted.

  As a specific example of the link connection of the pressure seat 11, a link joint in which a link (ring) 16 is integrally provided at one end of the connecting rod 15 is used as described above, and the connecting rod 15 is connected to one end of the cylindrical case 9C. The plate 19 and the pressure receiving seat 10 are loosely inserted and integrally joined to the pressure seat 11. For example, the end of the connecting rod 15 is inserted into the pressure seat 11, and a nut 17 is screwed to the projecting end from the pressure seat 11 and fastened. Further, the link 16 of the link joint is linked to the retaining chain 3 or the mounting bracket 12 on the pier 1 side or the mounting bracket 12 on the bridge girder 2 side through or without a known shackle 18.

  When the shock absorber 7 is interposed in the middle of the retaining chain 3 as shown in FIG. 2, the link 16 of the link joint is connected to one or the other retaining chain portion separated by the intervention via a shackle 18. Alternatively, the link 14 is linked without being interposed, and is linked with the pressure seat 11, and the link 14 attached to the other end plate 19 of the cylindrical case 9 </ b> C is connected to the other or one retaining chain via the shackle 18 or not. Link to the part.

  When the shock absorber 7 is linked to the end of the retaining chain 3 as shown in FIG. 3, the link 16 of the link joint is linked to the retaining chain 3 to be linked to the pressure seat 11, and the link. 14 is linked to the mounting bracket 12 attached to the pier 1 or the bridge girder 2.

  Alternatively, the link 16 of the link joint is linked to the mounting bracket 12 on the pier 1 side or the bridge girder 2 side to be linked to the pressure seat 11 and the link 14 is linked to the draw chain 3.

  As a specific example of the cylindrical case 9C, as shown in FIG. 6, a cylindrical body 22 whose one end is closed by a bottom plate (end plate 19) is used, and an opening at the other end of the cylindrical body 22 is a lid (end plate). 19), and the lid is attached to the cylinder 22 so as to be openable and closable by a screwing structure. As a specific example of the screwing structure, a male screw portion provided on the lid body is screwed into a female screw portion provided on the opening end of the cylindrical body 22, or a plurality of female screw cylinders 21 are provided on the side surface of the cylindrical body 22 as illustrated. The mounting hole 23 is provided at a position corresponding to the female screw cylinder 21 of the other lid, and the male screw 24 is inserted into the mounting hole 23 while being screwed into the female screw cylinder 21 for fastening.

  As shown in the drawing, the buffer material 8 in each of the above examples has a structure in which the buffer plates 25 are stacked or a single block structure in which the buffer plates 25 are not stacked.

  When the buffer material 8 has a laminated structure, the buffer plate at the stacking end facing the pressure seat 11 or the pressure receiving seat 10 is formed by a buffer plate 25a having a rigid elasticity against a compressive force, and both the rigid elastic buffer plates 25a are formed. A laminated structure in which a buffer plate 25b having flexibility against compressive force is interposed therebetween. The buffer plates 8 are bonded to each other or simply brought into a contact state.

  The cushioning material 8, that is, the cushioning plate 25 or the cushioning material block, uses synthetic rubber, natural rubber, synthetic resin or the like made of a single base material.

  FIG. 7 shows, as a specific example of the present invention, a pair of shock absorbers 7 using the swivel 9A, the box-shaped case 9B or the cylindrical case 9C described above, facing each other on the pressure receiving seat 10 side. 7 are connected by a shaft 26, and the links 14 of both shock absorbers 7 are linked to the retaining chain 3 or the mounting bracket 12 on the pier 1 side or the bridge girder 2 side.

  Depending on the implementation, a spacer 27 is interposed between the one pressure receiving seat 10 and the other pressure receiving seat 10.

  Also in this example, the pressure seat 11 of any one of the shock absorbers 7 is linked to the retaining chain 3 or the mounting bracket 12 on the pier 1 side or the mounting bracket 12 on the bridge girder 2 side via the other shock absorber 7. ing.

  According to the present invention, while utilizing the link coupling structure of the draw chain 3, it is possible to solve the problem that the buffer material in the preceding example peels off from the chain, increase the buffer stroke, and improve the buffer effect.

A and B are side views showing a conventional fallen bridge prevention device. The side view which outlines the case where the buffer device which concerns on the fallen bridge prevention apparatus of this invention is link-coupled in the middle of a detention chain. The side view which outlines the case where the buffering device which concerns on the falling bridge prevention apparatus of this invention is link-coupled to the edge part of a detention chain. 2A is a cross-sectional view showing an example in which a swivel is used as a cushioning material holder of the cushioning device in FIGS. 2 and 3, and B is a plan view of the swivel. FIG. Sectional drawing which shows the example which used the box-shaped case as the buffer material holder of the buffering device in the said FIG. 2, FIG. The perspective view which shows the example which used the cylindrical case as a buffer material holder of the buffering device in the said FIG. 2, FIG. Sectional drawing at the time of using the said each example buffer device as a pair.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bridge pier, 2 ... Bridge girder, 3 ... Detention chain, 5 ... Link, 7 ... Shock absorber, 8 ... Buffer material, 9 ... Buffer material holder, 9A ... Swivel, 9B ... Box-shaped case, 9C ... Cylindrical case, 10 DESCRIPTION OF SYMBOLS ... Pressure receiving seat, 11 ... Pressure seat, 12 ... Mounting bracket, 13 ... Ring seat, 14 ... Link, 15 ... Connecting rod, 16 ... Link, 17 ... Nut, 18 ... Shackle, 19 ... End plate, 20 ... Side plate, DESCRIPTION OF SYMBOLS 21 ... Female screw cylinder, 22 ... Cylindrical body, 23 ... Mounting hole, 24 ... Male screw, 25 ... Buffer plate, 25a ... Rigid elastic buffer plate, 25b ... Soft elastic buffer plate, 26 ... Shaft, 27 ... Spacer

Claims (4)

A falling bridge prevention device in which a bridge pier and a bridge girder end supported on the pier are connected by a draw chain, the shock absorber includes a shock absorber linked to the draw chain, and the shock absorber includes a shock absorber holder that holds the shock absorber. The buffer material held in the buffer material holder is interposed between the pressure receiving seat and the pressure seat, the pressure seat is linked to the retaining chain, and a tensile force applied to the retaining chain is applied to the pressure seat to provide the cushioning material. Is compressed between the pressure receiving seat and the cushioning material holder is constituted by a swivel comprising a ring seat and U-shaped links raised from both ends of the diameter line of the ring seat, and is supported by the ring seat. A fallen bridge prevention device characterized in that the cushioning material is interposed between a pressure receiving seat and a pressure seat movably disposed in the U-shaped link . In a falling bridge prevention device in which a bridge pier and a bridge girder end supported on the pier are connected by a retaining chain, the suspension device includes a shock absorber linked to the retaining chain, and the shock absorber includes a shock absorber holder that holds the shock absorber. The buffer material held in the buffer material holder is interposed between the pressure receiving seat and the pressure seat, the pressure seat is linked to the retaining chain, and a tensile force applied to the retaining chain is applied to the pressure seat to provide the cushioning material. Is compressed between the pressure receiving seat, and the cushioning material holder is constituted by a case including a pair of end plates and at least a pair of side plates provided between the both end plates, and the pressure receiving formed by the end plates of the case A falling bridge prevention device, wherein the cushioning material is interposed between a pressure receiving seat supported on the seat or the end plate and a pressure seat movably disposed between the side plates. A falling bridge prevention device in which a bridge pier and a bridge girder end supported on the pier are connected by a draw chain, the shock absorber includes a shock absorber linked to the draw chain, and the shock absorber includes a shock absorber holder that holds the shock absorber. The cushioning material held in the cushioning material holder is interposed between the pressure receiving seat and the pressure seat, the pressure seat is linked to a mounting bracket on the pier side or the bridge girder side, and the tensile force applied to the detention chain is applied to the pressure seat. The cushioning material is compressed between the pressure receiving seat and the cushioning material holder is constituted by a swivel comprising a ring seat and U-shaped links raised from both ends of the diameter line of the ring seat, A falling bridge prevention device characterized in that the cushioning material is interposed between a pressure receiving seat supported by the ring seat and a pressure seat movably disposed in the U-shaped link . In a falling bridge prevention device in which a bridge pier and a bridge girder end supported on the pier are connected by a retaining chain, the suspension device includes a shock absorber linked to the retaining chain, and the shock absorber includes a shock absorber holder that holds the shock absorber. The cushioning material held in the cushioning material holder is interposed between the pressure receiving seat and the pressure seat, the pressure seat is linked to a mounting bracket on the pier side or the bridge girder side, and the tensile force applied to the detention chain is applied to the pressure seat. And compressing the cushioning material between the pressure receiving seat and the cushioning material holder is constituted by a case comprising a pair of end plates and at least a pair of side plates provided between the two end plates. A falling bridge prevention device characterized in that the buffer material is interposed between a pressure receiving seat formed by an end plate or a pressure receiving seat supported on the end plate and a pressure seat movably disposed between the side plates.

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