JP2000096503A - Expansion device for bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion device for a bridge, which can absorb a large amount of movement in the direction of a bridge shaft or the direction orthogonal to the bridge shaft, and does not hinder traffic of vehicles through the bridge. SOLUTION: This expansion device for a bridge includes plates 1, 1 which are secured to an upper portion of an abutment or a bridge girder on one side and to an upper portion of a bridge girder on the other side, the upper portions facing to each other. One of the plates 1 has a plurality of fingers 2 arranged in a manner protruding toward the other plate 1 in the direction orthogonal to a bridge shaft, and the other plate 1 has a plurality of fingers 2 arranged on the upper surface thereof in the direction orthogonal to the bridge. Further, one plate 1 is disposed so as to cover a part of the other plate 1, and the fingers 2 of one plate 1 are each inserted into a space between the adjacent fingers 2 of the other plate 1 with a play. In this case, an intermediate member 3 for filling at least part of a gap between the fingers 2, 2 of the respective plates 1, 1 disposed on the other plate 1 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrapping type telescopic device for a bridge.

[0002]

2. Description of the Related Art A lap-type telescopic device for a bridge, for example,
As shown in FIG. 12, one plate 4 covers a part of the other plate 4 with the plate 4 having the finger 40 fixedly arranged on the upper surface of each of the adjacent bridge girders H, H having the play U. When the bridge girders H and H expand and contract due to a temperature change or the like, the two plates 4 and 4 move relative to each other, and the fingers 40 of one plate 4 It is designed to be absorbed in a manner to be inserted and removed between.

[0003] However, in the above-mentioned telescopic device for bridges,
For safety of vehicle traffic, fingers 40 of both plates 4 and 4
There cannot be a large gap between them. Therefore, when the bridge girders H, H are relatively moved in the bridge axis direction or in the direction perpendicular to the bridge axis due to an earthquake or the like, the relative movements of the bridge girders H, H cannot be sufficiently absorbed.

If the bridge girders H and H move relatively in the direction of the bridge axis or in the direction perpendicular to the bridge axis due to an earthquake or the like, the opposing plates 4 and 4 collide with each other, and the fingers 40 and the like are only damaged. Other bridge members may be damaged. Particularly, in the case of a seismically isolated bridge, the seismic isolation function of the bridge may be impaired. Further, if the finger 40 is damaged, emergency vehicles cannot pass therethrough, which is a serious problem in rescue operations.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention
It can absorb a large amount of movement in the bridge axis direction or the direction perpendicular to the bridge axis,
Moreover, it is an object of the present invention to provide a bridge telescopic device that does not interfere with vehicle traffic.

[0006]

Means for Solving the Problems (Invention of Claim 1)
The invention according to claim 1 is provided with plates fixed to the upper abutment or bridge girder on one side and the upper region opposite to the bridge girder on the other side, and one of the plates protrudes to the other plate side. It has a plurality of fingers arranged in the direction perpendicular to the bridge axis, and the other plate has a plurality of fingers arranged in the direction perpendicular to the bridge axis on the upper surface so that one plate covers a part of the other plate In addition, in a bridge telescopic device in which a finger of one plate is loosely inserted between adjacent fingers of the other plate, at least one gap is provided between the fingers of the two plates on the other plate. An intermediate member for supplementing the portion is provided. (Invention according to claim 2) The invention according to claim 2 relates to the bridge telescopic device according to the invention according to claim 1, wherein the intermediate member is deformed when a finger of one plate collides with the intermediate member. I have. According to a third aspect of the present invention, there is provided the bridge telescopic device according to the first aspect of the present invention, wherein the intermediate member is detached when a finger of one plate collides with the intermediate member. I have. According to a fourth aspect of the present invention, there is provided the bridge telescopic device according to the first aspect of the present invention, wherein the intermediate member is crushed when a finger of one plate collides with the intermediate member. I have.

[0007] The function of the telescopic device for a bridge according to the above invention will be described in detail in the following embodiments of the invention.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) As shown in FIG. 1, the bridge telescopic device of Embodiment 1 is disposed between bridge girders H, H having a play space U supported by a pier H 'via a seismic isolation device M. As shown in FIG. 1 and FIG. 2, plates 1 are provided at opposing portions of the bridge girders H, H, and one plate 1 is arranged in a plurality at right angles to the bridge axis so as to protrude toward the other plate 1 side. The other plate 1 has a plurality of fingers 2 arranged on the upper surface in the direction perpendicular to the bridge axis, so that one plate 1 covers a part of the other plate 1, The distal end of the finger 2 of one plate 1 is loosely inserted between the distal ends of the adjacent fingers 2 of the other plate 1. Then, a part of the gap is filled in the gap between the fingers 2 of the two plates 1 on the other plate 1 so that the intermediate member 3 which is deformed when the finger 2 of the one plate 1 collides with the gap. The provided plate 1 is long in the direction perpendicular to the bridge axis formed of a steel material. One plate 1 is plate-shaped and fixed to a vertical plate 11 and a reinforcing rib 12 provided below, and the other plate 1 is It is composed of a plate-shaped horizontal portion 13 and a vertical portion 14 provided on the one plate 1 side.
The first plate 1 is placed so as to cover the horizontal portion 13 of the other plate 1 from above, and a gap is formed between the fingers 2 of the two plates 1. FIG. 3 is a diagram illustrating a state before the intermediate member 3 is installed on the other plate 1. As is clear from the figure, in this bridge expansion and contraction device, a larger gap is formed between the fingers 2 and 2 than in the related art.

The one plate 1 is firmly fixed to the bridge girders H, H by an anchor (not shown). In this fixed state, the upper surface of the plate 1 and the upper surfaces of the bridge girders H, H are substantially flush. .

The finger 2 of the one plate 1 is
It is formed as a part of the plate 1 and has a substantially trapezoidal shape whose width decreases in the distal direction. The finger 2 of the other plate 1 is provided on the upper surface of the plate 1,
It has a triangular shape. 4 and 5, the upper surface of the finger 2 and the upper surface of the one plate 1 substantially coincide with each other.

The intermediate member 3 is made of an elastic material such as rubber and has a zigzag shape so that it can be inserted into the gap between the fingers 2 of the plates 1 and 1. The upper surface is flattened so that the upper surface substantially coincides with the upper surface of the one plate 1. In the first embodiment, the intermediate member 3 is provided so as to contact the finger 2 of the other plate 1.

Since the bridge telescopic device of the first embodiment has the above-described configuration, a situation (for example, an earthquake or the like) occurs in which the bridge girders H, H relatively move in the direction of the bridge axis or in the direction perpendicular to the bridge axis. When the finger 2 of one plate 1 collides with the intermediate member 3, the intermediate member 3 is in a state where the width of the M-shaped vertical section is compressed.

That is, when the bridge girders H, H move relative to each other in the bridge axis direction, a portion of the zigzag intermediate member 3 parallel to the direction perpendicular to the bridge axis is compressed, and the bridge girders H, H move in the direction perpendicular to the bridge axis. , The portion of the intermediate member 3 oblique to the direction perpendicular to the bridge axis is compressed. As a result, the fingers 2 and 2 of the plates 1 and 1 do not directly collide with each other, so that the impact is reduced and the relative movement is absorbed.

In addition, since the intermediate member 3 is present in the gap between the fingers 2 of the plates 1 and 1 and fills a part of the gap, there is no hindrance to the traffic of the vehicle. In the relative movement of the bridge girders H, H caused by the temperature change, the collision between the finger 2 and the intermediate member 3 does not occur.

In other words, in this bridge telescopic device, it is possible to secure a large gap between the fingers 2 and 2 of the plates 1 and 1 so that the bridge girders H can be moved in either the bridge axis direction or the direction perpendicular to the bridge axis. Even in the case of a large relative movement, the relative movement can be sufficiently absorbed without being damaged, and the vehicle can travel safely without the wheels being fitted in the gaps by the intermediate member 3.

Incidentally, even if the intermediate member 3 is deformed due to the collision of the finger 2, it returns to its original shape without being damaged. Further, even if the intermediate member 3 is damaged, it can be easily repaired simply by replacing the damaged intermediate member 3 with a new intermediate member 3, and there is no need for a complete repair work of the bridge expansion and contraction device. (Embodiment 2) As shown in FIG. 6, a bridge telescopic device according to Embodiment 2 has an intermediate member 3 having an N-shaped vertical section. As described above, the intermediate member 3 is not limited to the one in which the vertical cross section is M-shaped, and the intermediate member 3 has a shape in which a plurality of V-shaped parts are connected.
Any shape that can be deformed, such as being compressed when the finger 2 collides, may be used. (Embodiment 3) As shown in FIGS. 7 and 8, a bridge telescopic device according to Embodiment 3 is configured such that an intermediate member 3 is provided on the other plate 1 by a clearance between fingers 2 of two plates 1, 1. When the bridge girders H, H move relatively in the direction of the bridge axis or in the direction perpendicular to the bridge axis due to an earthquake or the like and the fingers 2 of one plate 1 collide with the intermediate member 3, the intermediate member 3 It is intended to be separated.

The intermediate member 3 is made of steel, concrete, hard rubber, or the like, and is fixed to the other plate 1 with a knock pin or the like. We do not leave. Also, when the intermediate member 3 is detached, the intermediate member 3 is moved so that the intermediate member 3 can move in the bridge axis direction and the direction perpendicular to the bridge axis.
Are designed so that there is a space between each of the fingers 2 and 2 of both plates 1 and 1.

In this manner, when the bridge girders H, H move relatively in the direction of the bridge axis or in the direction perpendicular to the bridge axis due to an earthquake or the like, and one finger 2 collides with the intermediate member 3, the intermediate member 3 is moved to the other. It is released from the state of being fixed on the plate 1 and the impact of the collision is absorbed.
1 can be relatively moved relatively in the bridge axis direction or the direction perpendicular to the bridge axis, and the relative movement of the bridge girders H, H is absorbed. Therefore, damage to the plate 1 and other bridge members is prevented, and the detached intermediate member 3 can be easily repaired by fixing it again.

The portion of the intermediate member 3 where the finger 2 collides may be covered with rubber. By doing so, it is possible to suppress the generation of the collision sound between the fingers. (Embodiment 4) In the bridge telescopic device of Embodiment 4, as shown in FIG. 9, the intermediate member 3 is fixed to the gap between the fingers 2, 2 of both plates 1, 1 as in Embodiment 1. When the finger 2 of one plate 1 collides, the intermediate member 3 is crushed.

The intermediate member 3 is composed of a crushed portion 30 made of steel and having an M-shaped vertical cross section and walls 31 on both sides thereof.
When the bridge girders H, H move relatively in the direction of the bridge axis or in the direction perpendicular to the bridge axis due to an earthquake or the like and the finger 2 of one of the plates 1 collides with the intermediate member 3, the crushed portion 30 of the intermediate member 3 The M-shaped width of the vertical section is in a compressed state.

The crushing portion 30 is not limited to the above-mentioned shape,
Any shape may be used as long as it crushes when the finger 2 collides, such as an N-shaped vertical cross section or a shape formed by connecting a plurality of V-shaped characters.

As described above, if the intermediate member 3 is structured to be crushed by the collision of the finger 2, it is possible to effectively absorb the impact of the collision of the finger 2. Therefore, damage to the plate 1 and other bridge members is prevented, and the crushed intermediate member 3 can be easily repaired by replacing it. (Other Embodiments) In the first to fourth embodiments, the bridge expansion / contraction device of the present invention is provided between the bridge girders. However, the bridge expansion / contraction device of the present invention is provided between the bridge girder and the abutment. It is also possible.

As shown in FIG. 10, a plurality of intermediate members 3 may be provided. By doing so, the gap between the fingers 2 and 2 of the plates 1 and 1 can be further increased. As shown in FIG. 11, intermediate members 3 and 3 may be provided so as to abut against the fingers 2 and 2 of both plates 1 and 1, respectively. Furthermore, when the finger 2 of one plate 1 collides with the intermediate member 3, the intermediate member 3 may be deformed or crushed and may be separated.

[0024]

Since the present invention has the above configuration, the following effects are obtained.

From the description of the embodiment of the present invention, it is possible to provide a telescopic device for a bridge which can absorb a large amount of movement in the direction of the bridge axis or in the direction perpendicular to the bridge axis and does not hinder the traffic of the vehicle.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a bridge telescopic device according to a first embodiment of the present invention is installed between bridge girders supported by a pier via a seismic isolation device.

FIG. 2 is a perspective view of the telescopic device for a bridge.

FIG. 3 is a cross-sectional view showing a state before an intermediate member of the bridge telescopic device is installed.

FIG. 4 is a sectional view taken along line XX of FIG. 2;

FIG. 5 is a sectional view taken along line YY of FIG. 2;

FIG. 6 is a cross-sectional view of a bridge telescopic device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a state in which a bridge telescopic device according to a third embodiment of the present invention is installed between bridge girders supported by a pier via a seismic isolation device.

FIG. 8 is a perspective view of a bridge telescopic device according to a fourth embodiment of the present invention.

FIG. 9 is a cross-sectional view of a bridge telescopic device according to a fourth embodiment of the present invention.

FIG. 10 is a plan view showing a case where a plurality of rows of intermediate members are provided.

FIG. 11 is a perspective view showing a case where an intermediate member is provided in contact with fingers of both plates.

FIG. 12 is a perspective view of a prior art bridge telescopic device.

[Explanation of symbols]

 1 plate 2 finger 3 intermediate member

Claims (4)

[Claims] Claims: 1. An abutment or bridge girder on one side and a plate fixed to opposing portions of the bridge girder on the other side, respectively.
One of the plates has a plurality of fingers arranged in the direction perpendicular to the bridge axis so as to protrude toward the other plate, and the other plate has a plurality of fingers arranged on the upper surface in the direction perpendicular to the bridge axis. In a bridge telescopic device in which the fingers of one plate cover a part of the other plate and the fingers of one plate are loosely inserted between adjacent fingers of the other plate. An expansion / contraction device for a bridge, wherein an intermediate member for filling at least a part of the gap is provided in the gap between the fingers of both upper plates. 2. The intermediate member is deformed when a finger of one plate collides with the intermediate member.
The telescopic device for a bridge according to the above. 3. The intermediate member is detached when a finger of one of the plates collides with the intermediate member.
The telescopic device for a bridge according to the above. 4. The intermediate member is crushed when a finger of one plate collides with the intermediate member.
The telescopic device for a bridge according to the above.