JPH09165719A - Connecting bridge fall preventive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preventive device whose bumping effect is higher compared with the prior art. SOLUTION: A connecting bridge fall preventive device 1 is provided with two bumping devices 10, a PC steel rod 20 (a connecting material) which connects the bumping devices 10 and a fixing jig 30 which fixes the end of the PC steel rod 20 with the damping devices 10. The bumping devices 10 are provided with a bumping gasket 11 which is in contact with a vertical surface of an end horizontal girder C, a laminated rubber 12 in contact with this bumping gasket 11, a coil spring 13 which is partially inserted into this laminated rubber 12 and a rustproof bearing board 14 which energizes this coil spring 13 toward the end of the PC steel rod 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge girder, and more particularly, to a bridge girder prevention device which is fixed to a bridge girder or abutment to be connected and is used for preventing a bridge from falling from a pier or abutment.

[0002]

2. Description of the Related Art Conventionally, a bridge prevention device has been used to prevent a bridge from falling, but it is particularly desired to install two or more bridge prevention devices after the Great Hanshin Earthquake.

[0003] Various types of bridge prevention devices have been developed and provided, and one of them is a connection type bridge prevention device.

The connection type bridge prevention device is a shock absorber provided on each bridge girder or abutment, and is connected to these shock absorbers by P
C steel material (connecting material) is provided to connect the bridge girder and the bridge girder or abutment to reduce the impact force, and prevent the PC steel rod from being cut and the bridge girder from falling from the pier or abutment.

Conventionally, a coil spring, a thick plate-shaped expandable sponge or the like has been mainly used as a shock absorber.

[0006]

However, the prior art has the following problems.

The coil spring has a constant spring constant, and the amount of bending can be freely selected. In order to increase the spring constant in such a coil spring, the diameter of the spring wire may be increased. However, there is an upper limit on the diameter of the spring wire rod due to the installation space on the bridge girder or abutment, the weight of the spring itself, etc. Therefore, the diameter of the spring wire rod, in other words, the spring constant is determined in design. When a coil spring with a low spring constant is used, when a large impact force (horizontal force) generated at the time of an earthquake is input, the coil spring reaches the stroke (shrinkage limit) immediately, and thereafter it becomes a cylindrical steel tube. Therefore, there is a problem in that the coil spring as the shock absorber cannot obtain the shock absorbing effect.

In addition, the elastic expansion sponge in the shape of a thick plate has a low spring constant in the initial stage of contraction, becomes more rigid after being crushed by about 75% of the thickness, and then the spring constant rapidly increases (hardening). , Like pressing hard solid rubber. Therefore, there is a problem that the elastic sponge as a shock absorber has a poor shock absorbing effect.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a connection type bridge prevention device having a higher cushioning effect than the prior art.

[0010]

The gist of the invention according to claim 1 is to provide a bridge girder, a connecting member for connecting the bridge girder or abutment, a shock absorber fixed to each end of the connecting member, and the shock absorber. Is a connecting jig for preventing the bridge from falling from the pier or abutment by connecting the bridge girder and the bridge girder or abutment with a fixing jig for fixing to the end of the connecting material. The shock absorbing device is provided with a shock absorbing packing located on the bridge girder or abutment side to be connected, and an insertion hole that is located on the end side of the connecting material with respect to the shock absorbing packing, penetrates in the axial direction, and is inserted into the connecting material. The cushioning rubber material, a spring inserted into the cushioning rubber material, which is longer than the axial length of the cushioning rubber material and smaller in diameter than the insertion hole, and a part of which is inserted into the insertion hole; Biased toward the end of the connecting material by a spring Lies in articulated girder preventing apparatus characterized by having an end-side surface of the cushioning rubber material and a rust bearing capacity plate located over the predetermined interval. The gist of the invention according to claim 2 resides in. The bridge girder is provided with a bridge girder, a connecting member that connects the bridge girder or abutment, a shock absorber that is fixed to each end of the connecting member, and a fixing jig that fixes the shock absorber to the end of the connecting member. And a bridge girder or abutment to prevent the bridge from falling from the pier or abutment, and the shock absorber is a shock absorber packing located on the bridge girder or abutment side to be connected, Laminated rubber that is located on the end side of the connecting material with respect to the buffer packing, has an insertion hole that penetrates in the axial direction and is inserted into the connecting material, and the axial direction of the laminated rubber that is inserted into this laminated rubber. A part of the spring inserted into the insertion hole, which is longer than the length of the laminated rubber and has a diameter smaller than that of the insertion hole, and a surface of the laminated rubber which is urged toward the end of the connecting member by the spring. And the rust prevention pressure plate located through the required space Articulated girder prevention device characterized by. The gist of the invention according to claim 2 is to provide a bridge girder and a connecting member for connecting the bridge girder or abutment.
The bridge pier is provided with a shock absorber fixed to each end of the connecting member and a fixing jig for fixing the shock absorber to the end of the connecting member, and by connecting the bridge girder and the bridge girder or abutment. Alternatively, a connecting type bridge prevention device for preventing a bridge from falling from the abutment, wherein the shock absorbing device is located on the side of the bridge girder or abutment to be connected, and on the end side of the connecting material with respect to this buffer packing. Then, having a large-diameter portion and a small-diameter portion, a buffer rubber material provided with an insertion hole to be inserted into the connecting material, and a length longer than the axial length of the buffer rubber material and a diameter larger than the small-diameter portion, A spring partially inserted in the large diameter portion, and a rust-preventing pressure plate that is urged toward the end of the connecting member by the spring and that is located with a required distance from the end-side surface of the cushioning rubber material. In a bridge-type bridge prevention device characterized by having The gist of the invention of claim 2 is
The bridge girder is provided with a bridge girder, a connecting member that connects the bridge girder or abutment, a shock absorber that is fixed to each end of the connecting member, and a fixing jig that fixes the shock absorber to the end of the connecting member. When,
A connecting type bridge prevention device for preventing a bridge from falling from a pier or abutment by connecting with a bridge girder or abutment,
The shock absorber is inserted into a connecting material having a large diameter part and a small diameter part, which is located on the bridge girder or abutment side to be connected, and on the end side of the connecting material with respect to the buffer packing. A laminated rubber having an insertion hole, a spring which is longer than the axial length of the laminated rubber and has a diameter larger than that of the small diameter part, and which is partially inserted into the large diameter part, and the end of the connecting member by the spring. The connection type bridge prevention device is characterized in that it has a surface on the end side of the laminated rubber and a rust-preventing pressure-bearing plate that is located at a required interval, and is biased in the direction of the part. In addition, the laminated rubber of the connection type fallout prevention device having the above-described structure may be provided with a steel plate on one surface on the bridge girder or abutment side, and the steel plate may be provided with an insertion hole. Also, with cushion packing,
An expansion sponge may be interposed between the bridge girder and the surface of the abutment. In addition, the shock absorber is a bellows-shaped side,
Further, the inside can be covered with a rust preventive cap provided with a locking piece continuous in the circumferential direction and extending inward in the radial direction. Further, a buffer packing can be integrally formed with the buffer rubber material or the laminated rubber.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) As shown in FIG. 1, a connection type bridge prevention device 1 according to Embodiment 1 is a PC girder B (a girder made of prestressed concrete) on a pier P.
They are connected to each other to prevent the bridge from falling from the pier P, and are installed on the end cross girder C of the PC girder B.

As shown in FIG. 2, the connection type bridge prevention device 1 includes two shock absorbing devices 10, a PC steel rod 20 (connecting material) connecting the both shock absorbing devices 10, and an end portion of the PC steel rod 20. The fixing jig 30 for fixing to the shock absorber 10 is provided. It should be noted that one of the shock absorbers 10 is omitted in FIG.
In the figure, the symbol F is a precautionary bar.

As shown in FIG. 2, the shock absorber 10 includes a shock absorbing packing 11 in contact with the vertical plane of the end cross beam C, a laminated rubber 12 in contact with the shock absorbing packing 11, and a part of the laminated rubber 12. Coil spring 13 in which is inserted
The coil spring 13 is provided with a rustproof pressure support plate 14 that is biased toward the end of the PC steel rod 20.

The cushion packing 11 is, as shown in FIG.
It is a disk having a hole 11a inserted through the PC steel rod 20 in the center. A plurality of grooves 11b are concentrically formed on both surfaces. The grooves 11b are staggered on each surface, as shown in FIG. The material is chloroprene rubber.

The laminated rubber 12 is, as shown in FIG. 4 and FIG.
It has a cylindrical shape in which three iron plates 12a are laminated, and an insertion hole 12b is opened at the center of the cross section. Insertion hole 12b
Is inserted into the PC steel rod 20 and comprises a large diameter portion 12e and a small diameter portion 12d, as shown in FIG. The coil spring 13 shown in FIG. 2 is housed in the large diameter portion 12e. A steel plate 12c is embedded on one surface of the end cross girder C side. A small diameter portion 12d is opened in the center of the steel plate 12c. The diameter of the small diameter portion 12d is smaller than the diameter of the large diameter portion 12e, and P
The diameter is slightly larger than the diameter of the C steel rod 20. In addition,
The material for the iron plate 12a may be SS400 or the like, which is suitable for carrying out the present invention.

A part of the coil spring 13 is inserted in the large diameter portion 12e. The diameter of the coil spring 13 is smaller than the diameter of the large diameter portion 12e and larger than the diameter of the small diameter portion 12d. Therefore, one end of the coil spring 13 contacts the inner edge of the coated steel plate 12c.

As shown in FIG. 2, the anticorrosive pressure support plate 14 is biased toward the end portion side of the PC steel rod 20 by the coil spring 13, and is positioned with a predetermined distance from the end portion side surface of the laminated rubber 12. ing. As shown in FIG. 6, the rustproof pressure support plate 14 has a disc shape with a hole formed in the center.

The PC steel rod 20 shown in FIG. 2 has a rubber lining having a rust preventive effect, and penetrates the two end cross girders C. Each end transverse beam C is provided with a spiral sheath.

A temperature expansion / contraction material 51 is interposed between the end cross girders C, C facing each other, as shown in FIG. The material is chloroprene sponge.

As shown in FIG. 2, the fixing jig 30 is provided between the W nut 31 and the rust-preventing pressure-bearing plate 14 and the W nut 31 that is individually fastened at each end of the PC steel rod 20. And a disc-shaped anti-rust washer 32.

The fixing jig 30 and the shock absorber 10 are
It is covered with an anticorrosion cap 40. Rust prevention cap 4
Reference numeral 0 denotes a substantially cylindrical body that is fixed to the shock absorber 10 by the tightening jig 43 and has a tapered end portion, and has a bellows 41 on its side surface. A locking piece 42 that is continuous in the circumferential direction and extends radially inward is provided inside. The outer edge portion of the end surface of the antirust pressure bearing plate 14 is locked to the locking piece 42.

FIGS. 7 to 9 show a state in which the shock absorber 10 constructed as described above receives a horizontal force.

When a horizontal force is applied, the coil spring 13 first retracts as shown in FIG. The shock absorber 10 in the absence of a horizontal force is shown in FIG.

Further, when the displacement due to the horizontal force increases,
The surface of the anticorrosion pressure support plate 14 on the side of the end girder C contacts the end surface of the laminated rubber 12, and the buffer packing 11 is retracted via the laminated rubber 12 as shown in FIG.

By the above operation, the horizontal force applied to the PC steel rod 20 is buffered.

When an excessive impact force is input, after the above operation, the laminated rubber 12 contracts and interferes with the impact force as shown in FIG. Even if an excessive impact force is input by such an operation, it can be buffered. In other words, the laminated rubber 12 plays a role of a safety stopper, so to speak.

Next, FIG. 10 shows a force displacement diagram when the shock absorber 10 is deformed as described above.

As shown in FIG. 10, in the coil spring, when a large horizontal force generated at the time of an earthquake is input as shown by the line L, the stroke is immediately reached, and thereafter, the cylinder spring becomes a cylindrical steel tube. .

As shown by the line M, the elastic sponge has a low spring constant in the initial stage of contraction, has a high rigidity after being crushed by about 75% of the thickness, and thereafter has a sharp increase in spring constant.

On the other hand, in the shock absorber 10 according to the present embodiment, as shown by the line N, the spring constant does not change abruptly and the linearity is maintained.

Next, the effect of the connection-type bridge prevention device 1 according to the embodiment configured as described above will be described.

As shown in FIG. 10, unlike a stretchable sponge, a high spring constant can be obtained from the beginning of deformation.

As shown in FIG. 10, a spring constant higher than that of the coil spring can be obtained at any displacement. In other words, the spring constant of the shock absorber 10 can be increased without depending on the design.

As described above, the shock absorbing device 10 has a high shock absorbing effect which cannot be obtained by the coil spring and the elastic sponge.

Since the linearity is strong as shown in FIG. 10, analysis / design is easy.

The side surface of the rust preventive cap 40 is a bellows 41.
Since it is attached, it is not damaged when the shock absorber 10 is expanded or contracted. Further, even when the laminated rubber 12 contracts and swells in the lateral direction (vertical direction in the installed state), it is not damaged.

Further, since the steel disc 14a is embedded in the rust-preventing pressure plate 14, the rust-preventing pressure plate 14 does not warp when pressed by the PC steel rod 20, and the pressing force is evenly laminated rubber. 12 can be transmitted.

Since the steel plate 12c is provided,
The pressing force can be evenly transmitted to the cushion packing 11 without the laminated rubber 12 warping.

In the connection type bridge prevention device 1 according to the first embodiment, the PC girders B are connected, but the PC girder B and the abutment R can be connected as shown in FIG. 11 or 12. .

In the connection type bridge prevention device 1 shown in FIG. 11, the shock absorbing device 10 on the abutment R side is covered with a protective cover 70. The protective cover 70 is a bottomless box having a rectangular cross section. A flange 71 for attachment to the abutment R is formed at the edge.

Further, the connection type bridge prevention device 2 shown in FIG.
In the above, the laminated rubber is not interposed between the cushion packing 111 of the cushion device 110 on the abutment R side and the anticorrosion pressure support plate 113. Further, the rust prevention pressure support plate 113 is urged by the urging means, and no space is provided between it and the cushion packing 111. The stroke corresponding to the shock absorber 1 on the side of the end cross girder C
I have it in 00. Therefore, the thickness of the laminated rubber 102 and the length of the coil spring 103 are made larger than those of the shock absorber 10. In the figure, reference numeral 114 is an antirust washer.

(Embodiment 2) In the connecting type bridge prevention device according to Embodiment 2, as shown in FIG. 13, steel girders S and S are connected to each other to prevent a bridge from falling.

The shock absorber 10 according to the second embodiment is shown in FIG.
As shown in FIG. 3, it is the same as the shock absorber 10 according to the first embodiment.

To fix to the steel girder S, the brackets 80 are fixed to both side surfaces (only one side surface is shown in FIG. 13) of the web of the steel girder S. Bracket 80
Is a substrate 81 fixed to the steel girder S as shown in FIGS. 14 and 15, and a vertical plate 82 vertically provided on the substrate 81.
The stiffener 83 that supports the vertical plate 82 is provided.
As shown in FIG. 14, a PC cable 90 is attached to the vertical plate 82.
A hole 82a that is inserted through the (connecting material) is provided.

As shown in FIG. 13, the rust preventive cap 85 is a two-piece member which is divided into a tip end side and a base end side, and the tip end side is fitted into the inside of the base end side and is expandable and contractible. It has a simple structure. Note that the rust preventive cap 40 according to the first embodiment can be attached instead of the rust preventive cap 85. Further, in the first embodiment, the rust preventive cap 85 according to the first embodiment can be attached instead of the rust preventive cap 40.

Connection type bridge prevention device 1 according to the second embodiment
The operation and effect of are the same as those of the first embodiment.

Also in the connection type bridge prevention device 1 according to the second embodiment, the PC girder B and the abutment R can be connected in the same manner as in the first embodiment.

The present invention is not limited to the first and second embodiments, but the length of the laminated rubber 12, the number and thickness of the iron plates 12a to be laminated, the coil spring 1
The length and wire diameter of 3, the thickness of the buffer packing 11, and the like may be set to be suitable for carrying out the present invention in consideration of the span of the bridge girders to be connected, the installation space, and the like.

Further, the groove 1 formed in the cushion packing 11
The number of 1b can also be a number suitable for implementing the present invention. Further, the groove 11b need not be engraved.

Further, an expansion sponge 60 may be interposed between the cushion packing 11 and the surface of the bridge girder or abutment R. In such a case, the stroke as the shock absorber can be lengthened. In addition, coil spring 1
Since the stretchable sponge 60 is crushed before the 3 shrinks, the cushioning effect can be further enhanced.

Further, although the W nut 31 is used as the fixing jig, the present invention is not limited to this and can be made suitable for carrying out the present invention.

Although the PC steel rod 20 and the PC cable 90 are used as the connecting rods, the present invention is not limited thereto, and other PC steel materials, PC ropes, etc. are suitable for carrying out the present invention. Can be

Further, not only the bridge pier P but also the wall portion RW of the abutment R and the bridge girder such as the PC girder B can be installed so as to be connected as shown in FIG. Reference symbol G is the ground.

The laminated rubber 200 shown in FIG.
The cushion packing is integrally molded, and is roughly composed of a laminated rubber portion 210 and a cushion packing portion 220. The laminated rubber portion 210 has a large-diameter portion 2 continuous in the axial direction at the center in plan view.
11 is formed. A coil spring is inserted into the large diameter portion 211 as in the first or second embodiment. In the figure, reference numeral 212 is an iron plate. Buffer packing 2
A small-diameter portion 221 that is continuous with the large-diameter portion 211 is formed on the 20. The connecting material is inserted through the small diameter portion 221. Further, the cushion packing 220 has a steel plate 222 embedded at its end (upper part in FIG. 16). As the material of the rubber portion, natural rubber, chloroprene rubber or the like suitable for carrying out the present invention can be adopted. In the laminated rubber 200 configured as described above, since it is not necessary to interpose the cushion packing, it is possible to reduce the manufacturing cost of the entire connection type bridge prevention device.

As shown in FIG. 17, a hard rubber 311, an iron plate 312, a soft rubber 313, and an iron plate 312 may be laminated in this order on the laminated rubber or the laminated rubber portion thereof in the present invention. it can. A cushion packing is integrally formed with the laminated rubber 300 shown in FIG. 17, and is roughly configured by a laminated rubber portion 310 and a cushion packing portion 320. It is preferable that the hard rubber 311 has an elastic coefficient several times or more that of a soft rubber or the like such as rubber fiber. In the figure, reference numeral 321 is a steel plate.

Further, as shown in FIG. 18, a hard rubber 411 is formed on the laminated rubber or the laminated rubber portion thereof in the present invention.
And that made of only the soft rubber 412 are also included. A cushion packing is integrally formed with the laminated rubber 400 shown in FIG.
The laminated rubber portion 410 and the buffer packing portion 420 are generally configured. The cushion packing 420 is made of hard rubber 411.
Since it is in contact with, it is not necessary to embed a steel plate inside the cushioning packing portion 420. This is because the hard rubber 411 that covers and is in contact with the cushion packing 420 can evenly apply pressure to the cushion packing 420. Further, since the steel plate is not embedded, the thickness of the laminated rubber 400 can be reduced.

In the laminated rubber or the laminated rubber portion thereof according to the present invention, as shown in FIG.
11 and one layer of soft rubber 512 are also included.
A cushion packing is integrally formed with the laminated rubber 500 shown in FIG. 19 and is roughly configured by a laminated rubber portion 510 and a cushion packing portion 520. The buffer packing 520 is made of hard rubber 521. Even in such a configuration, it becomes unnecessary to embed the steel plate.

Further, as shown in FIG. 20, a hard rubber 612 may be embedded between the iron plates 611 and 611 in the laminated rubber or the laminated rubber portion thereof in the present invention. In the figure, reference numeral 613 is soft rubber. A cushion packing is integrally formed with the laminated rubber 600 shown in FIG. 20, and is roughly configured by a laminated rubber portion 610 and a cushion packing portion 620. A steel plate 621 is embedded in the cushion packing 620.

Further, in the present invention, instead of the laminated rubber or laminated rubber portion, a single-layer cushion rubber material 700 may be employed as shown in FIG. A cushion packing is integrally formed with the cushion rubber material 700 shown in FIG. 21, and a rubber portion 710 corresponding to the laminated rubber in another embodiment is formed.
And a cushion packing 720.
As the material of the cushioning rubber material 700, natural rubber, chloroprene rubber or the like suitable for carrying out the present invention can be adopted. A steel plate 721 is embedded in the buffer packing portion 720. Buffer rubber material 700 configured as described above
Can be manufactured at a very low cost as compared with the laminated rubber. In addition, it can be made extremely lightweight.

As the molding method, a method suitable for carrying out the present invention, such as vulcanization molding, can be adopted.

In the above figure, the same components are designated by the same reference numerals.

[0063]

Since the present invention is configured as described above, the following effects can be obtained. Unlike elastic sponge, a high spring constant is obtained from the beginning of deformation. In addition, a spring constant higher than that of the coil spring can be obtained. As described above, the shock absorbing device has a high shock absorbing effect that cannot be obtained by the coil spring and the elastic sponge. As a result, according to the present invention, safety can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a connection type bridge prevention device installed between PC girders according to a first embodiment.

FIG. 2 is an enlarged view of the shock absorber according to the first embodiment.

FIG. 3 is a front view of the cushion packing according to the first embodiment.

FIG. 4 is a front view of the laminated rubber according to the first embodiment.

FIG. 5 is a vertical cross-sectional view of the laminated rubber according to the first embodiment.

FIG. 6 is a front view of the antirust pressure bearing plate according to the first embodiment.

FIG. 7 is an operation diagram of the connection type bridge prevention device according to the first embodiment.

[Fig. 8] Fig. 8 is an operation diagram of the connection type bridge prevention device according to the first embodiment.

[Fig. 9] Fig. 9 is an operation diagram of the connection-type falling bridge prevention device according to the first embodiment.

FIG. 10 is a force displacement diagram of the shock absorber according to the first embodiment.

FIG. 11 is a side view when the shock absorber according to the first embodiment is attached to the abutment.

FIG. 12 is a side view showing a modified example of the connection type bridge prevention device according to the first embodiment.

FIG. 13 is a mounting front view showing a shock absorber installed in a steel girder according to the second embodiment.

FIG. 14 is a plan view of mounting the bracket according to the second embodiment.

15 is a cross-sectional view taken along the line AA of FIG.

FIG. 16 is a vertical cross-sectional view of a cushioning rubber material according to another embodiment.

FIG. 17 is a vertical sectional view of a laminated rubber according to another embodiment.

FIG. 18 is a vertical sectional view of a laminated rubber according to another embodiment.

FIG. 19 is a vertical sectional view of a laminated rubber according to another embodiment.

FIG. 20 is a vertical cross-sectional view of a laminated rubber according to another embodiment.

FIG. 21 is a vertical sectional view of a cushioning rubber material.

[Explanation of symbols]

 B PC girder C End cross girder F Core reinforcing bar G Ground P Bridge pier R Abutment RW Wall part S Steel girder 1, 2 Connection type bridge prevention device 10 Buffer device 11 Buffer packing 11a hole 11b Groove 12 Laminated rubber 12a Iron plate 12b Steel plate 12c Steel plate 12d small diameter part 12e large diameter part 13 coil spring 14 rust prevention pressure support plate 14a steel disc 20 PC steel rod (connecting material) 30 fixing jig 31 W nut 32 rust prevention washer 40 rust prevention cap 41 bellows 42 locking piece 43 43 tightening Fixture 51 Temperature expansion / contraction material 60 Expansion / contraction sponge 70 Protective cover 71 Flange 80 Bracket 81 Substrate 82 Vertical plate 82a Hole 83 Stiffening material 85 Anticorrosion cap 90 PC cable 100 Shock absorber 102 Laminated rubber 103 Coil spring 110 Shock absorber 111 Shock absorbing packing 113 Anticorrosion bearing plate 114 Antirust washer 120 Loose Impact rubber material 120a Iron plate 120b Insertion hole 120c Steel plate 120d Small diameter part 120e Large diameter part 200 Laminated rubber 210 Laminated rubber part 211 Large diameter part 212 Iron plate 220 Buffer packing part 221 Small diameter part 222 Steel plate 300 Laminated rubber 310 Laminated rubber part 311 Hard rubber 312 Iron plate 313 Soft rubber 320 Buffer packing part 321 Steel plate 400 Laminated rubber 410 Laminated rubber part 411 Hard rubber 412 Soft rubber 420 Buffer packing part 500 Laminated rubber 510 Laminated rubber part 511 Hard rubber 512 Soft rubber 520 Buffered rubber part 521 Laminated rubber 600 Laminated rubber 600 610 Laminated rubber part 611 Iron plate 612 Hard rubber 613 Soft rubber 620 Buffer packing part 621 Steel plate 700 Buffer rubber material 710 Rubber part 720 Buffer packing part 721 Steel plate

Claims (8)

[Claims] 1. A bridge girder, a connecting member for connecting the bridge girder or abutment, a shock absorber fixed to each end of the connecting member, and a fixing jig for fixing the shock absorber to the end of the connecting member. By providing a tool and connecting the bridge girder and the bridge girder or abutment,
A connection type bridge prevention device for preventing a bridge from falling from a pier or abutment, wherein the shock absorbing device is a shock absorbing packing located on the bridge girder or abutment side to be connected, and an end portion of the connecting material with respect to the shock absorbing packing. Located on the side, penetrates in the axial direction, and is provided with an insertion hole through which the connecting member is inserted, and a length in the axial direction of the cushioning rubber material that is inserted into the cushioning rubber material and is longer than the axial length of the cushioning rubber material. A spring having a diameter smaller than that of the insertion hole, a part of which is inserted into the insertion hole, and a surface of the cushioning rubber member which is urged toward the end of the connecting member by the spring. And a rust-preventing pressure-bearing plate located at a required distance, and a connection type bridge prevention device. 2. A bridge girder, a connecting member for connecting the bridge girder or abutment, a shock absorber fixed to each end of the connecting member, and a fixing jig for fixing the shock absorber to the end of the connecting member. By providing a tool and connecting the bridge girder and the bridge girder or abutment,
A connection type bridge prevention device for preventing a bridge from falling from a pier or abutment, wherein the shock absorbing device is a shock absorbing packing located on the bridge girder or abutment side to be connected, and an end portion of the connecting material with respect to the shock absorbing packing. A laminated rubber that is located on the side, axially penetrates, and is provided with an insertion hole that is inserted into the connecting member, and the insertion length that is longer than the axial length of the laminated rubber inserted into the laminated rubber A spring having a smaller diameter than the hole, a part of which is inserted into the insertion hole, and a surface on the end portion side of the laminated rubber, which is biased by the spring toward the end portion of the connecting member, has a required space. An interlocking bridge prevention device, characterized in that it has a rust-preventing pressure plate located therethrough. 3. A bridge girder, a connecting member for connecting the bridge girder or abutment, a shock absorber fixed to each end of the connecting member, and a fixing jig for fixing the shock absorber to the end of the connecting member. By providing a tool and connecting the bridge girder and the bridge girder or abutment,
A connection type bridge prevention device for preventing a bridge from falling from a pier or abutment, wherein the shock absorbing device is a shock absorbing packing located on the bridge girder or abutment side to be connected, and an end portion of the connecting material with respect to the shock absorbing packing. And a buffer rubber material having a large-diameter portion and a small-diameter portion and provided with an insertion hole to be inserted into the connecting member, and a diameter longer than the axial length of the buffer rubber material and having the small diameter. A part of the spring having a larger diameter that is inserted into the large-diameter part, and a surface on the end part side of the cushioning rubber member urged by the spring toward the end part of the connecting member through a required space. A bridge-type bridge prevention device characterized in that it has a rust-preventing pressure plate located at 4. A bridge girder, a connecting member for connecting the bridge girder or abutment, a shock absorber fixed to each end of the connecting member, and a fixing jig for fixing the shock absorber to the end of the connecting member. By providing a tool and connecting the bridge girder and the bridge girder or abutment,
A connection type bridge prevention device for preventing a bridge from falling from a pier or abutment, wherein the shock absorbing device is a shock absorbing packing located on the bridge girder or abutment side to be connected, and an end portion of the connecting material with respect to the shock absorbing packing. A laminated rubber having a large-diameter portion and a small-diameter portion that are located on the side and provided with an insertion hole that is inserted into the connecting member; and a diameter that is longer than the axial length of the laminated rubber and has a diameter larger than that of the small-diameter portion. And a spring partially inserted into the large-diameter portion and a surface urged toward the end of the connecting member by the spring on the end side of the laminated rubber via a required space. An interlocking bridge prevention device characterized by having a rust-preventing pressure plate. 5. The cushioning rubber material and the laminated rubber,
5. A steel plate is embedded in one end surface on the bridge girder or abutment side, and the small diameter portion is provided in the steel plate.
The linked bridge prevention device described. 6. The connection type bridge collapse prevention device according to claim 1, wherein an expansion sponge is interposed between the cushion packing and the surface of the bridge girder or abutment. 7. The shock absorber has a bellows-shaped side surface,
The connection type bridge prevention device according to any one of claims 1 to 4, wherein the inside is covered with a rust preventive cap provided with a locking piece continuous in the circumferential direction and extending inward in the radial direction. 8. A cushion packing is integrally formed with the cushion rubber material or the laminated rubber.
4. A bridge-type bridge prevention device according to any one of 4 to 4.