JP3912493B2 - Road bridge telescopic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a road bridge expansion / contraction device, and more particularly to a road bridge expansion / contraction device designed to reduce maintenance costs.
[0002]
[Prior art]
Conventionally, as a road bridge expansion and contraction device installed between both bridge girders of a road bridge, a plurality of reinforcing steel plates extending in the width direction of the road bridge are embedded in the upper and lower parts of the rubber board, respectively, for reinforcing the rubber board What formed the groove part extended in the road bridge width direction in the upper-lower surface between steel plates is generally known. When the distance between the two bridge girders is reduced due to seasonal temperature changes, the road bridge expansion / contraction device having the expansion / contraction part of the rubber board rises when the center part of the rubber board rises and the vehicle travels over it. There was a problem that noise was generated because the part was pushed down and hit the bridge girder.
[0003]
Therefore, as a countermeasure, in recent years, a load support part is installed between both bridge girders, and the center part side where the extension part rises is fixed on the load support part, and the load support part and the extension part are integrated into a road bridge. Telescopic devices have been proposed. The load support part has a structure in which a load support steel plate is installed on both bearings that deform when a force in the shearing direction is applied, and an expansion / contraction part is fixed to the load support steel plate to prevent bulge. I have to. Moreover, when the distance between both bridge girders expands and contracts, a support body deform | transforms with an expansion-contraction part, and it can respond now to the expansion / contraction between both bridge girders.
[0004]
By the way, the expansion / contraction part progresses more rapidly due to wear or the like due to running of the vehicle, compared to the load support part installed below the expansion / contraction part. Therefore, even though the load support part can still be used when replacing the expansion / contraction part, it is necessary to replace the entire road bridge expansion / contraction device because the expansion / contraction part and the load support part have an integral structure. There is a problem that the cost is increased.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a road bridge expansion / contraction device capable of reducing maintenance costs in a road bridge expansion / contraction device in which an expansion / contraction portion is fixed on a load support portion.
[0006]
[Means for Solving the Problems]
The present invention to achieve the above object, a road bridge expansion joint fixing the telescopic part on the load-bearing part which is placed between the two bridge girder, and a collapsible portion and the load-bearing part to freely divided structure detachable, the load The support part is composed of both block bodies for fixing the road bridge expansion and contraction device to both bridge girders, and a bridge support part between the bridge girders fixed between the block bodies, the block body is made of steel, and the road bridge width. Formed in a rectangular parallelepiped shape extending in the direction, provided on one side surface of the block body with a projecting portion for embedding and fixing the block body in the bridge girder, and the support portion between the bridge girders is placed on the bridge girder and A flat bottom plate fixed to the block body by bolts, and both support bodies fixed on the bottom plate by vulcanization adhesion with the block body and a space interposed therebetween and deformable in the direction of road bridge extension; Constructed integrally between the two bearing bodies It consists of a heavy supporting plate, characterized in that the expansion portion is detachably fixed by bolts to the block body and the load support plate.
[0007]
As described above, since the stretchable part and the load support part have a detachable divided structure, it is possible to replace only the stretchable part when the stretchable part deteriorates and needs to be replaced. Therefore, since it is not necessary to replace the entire road bridge expansion / contraction device as in the prior art, maintenance costs can be reduced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0009]
FIG. 1 shows an example of a road bridge expansion / contraction device according to the present invention. The road bridge expansion / contraction device expands / contracts according to the expansion / contraction of the distance between the load support portion 1 and the bridge girder X. Part 3 is provided.
[0010]
The load support portion 1 is composed of both block bodies 11 for fixing the road bridge telescopic device to both bridge girders X and an inter-girder support portion 21 fixed between both block bodies 11.
[0011]
Both block bodies 11 are made of steel and have a rectangular parallelepiped shape extending in the road bridge width direction. On one side surface 12 of the block body 11, projecting portions 13 embedded and fixed in the bridge girder X are projected at predetermined intervals in the road bridge width direction.
[0012]
In the inter-girder support portion 21, both support bodies 23 are fixedly provided on a flat bottom plate 22 made of a steel plate placed on each bridge girder X. Each bearing body 23 is composed of a laminated rubber bearing body in which rubber layers 24 and steel plates 25 are alternately laminated. When the distance between the bridge beams X expands and contracts and a shearing force acts in the road bridge extending direction Y, It can be deformed in the shearing direction, that is, the road bridge extending direction Y.
[0013]
A load support plate 26 made of a steel plate is installed between the two support bodies 23. The bottom plate 22, the support body 23, and the load support plate 26 are bonded together when the support body 23 is vulcanized to have an integral structure.
[0014]
By fixing the bottom plate 22 to the lower surface 14 of each block body 11 with bolts 4, the inter-girder support portions 21 are fixed to both block bodies 11 while the space portion 5 is interposed between the support body 23 and the block body 11. is doing.
[0015]
The expansion / contraction part 3 installed on the load support part 1 has an elastic board 31 made of a rubber board, and a plurality of reinforcing steel plates 32 extending in the width direction of the road bridge at the upper and lower parts in the elastic board 31 respectively. 33 are buried. Between the reinforcing steel plates 32 on the upper surface 31a of the elastic board 31, a plurality of grooves 34 extending in the width direction of the road bridge along the reinforcing steel plates 32 are formed. A plurality of grooves 35 extending in the width direction of the road bridge along the reinforcing steel plate 33 are also formed between the reinforcing steel plates 33 on the lower surface 31 b of the elastic board 31.
[0016]
The expansion and contraction of the groove portions 34 and 35 following the expansion and contraction of the distance between the bridge beams X allows the expansion and contraction portion 3 to expand and contract. Bolt holes 36 and 37 for fixing the expansion / contraction part 3 on the load support part 1 are drilled at predetermined intervals along the road bridge width direction at both ends and the center part of the elastic board 31 in the road bridge extending direction. It is installed.
[0017]
The elastic board 31 is placed between the upper surfaces 15 of both block bodies 11, and the elastic board 31 is detachably fixed to both block bodies 11 by the bolts 6 inserted into the bolt holes 36 at both ends of the road bridge extending direction. Yes. In addition, the elastic plate 31 is detachably fixed to the load support plate 26 by the bolt 7 inserted through the bolt hole 37 at the center of the road bridge extending direction.
[0018]
The expansion / contraction part 3 can be removed from the load support part 1 by removing the bolts 6 and 7, and has a split structure that is detachable from the load support part 1.
[0019]
When the distance between the bridge girders X is reduced, the above-mentioned road bridge expansion and contraction device is such that the grooves 34 and 35 are reduced and deformed, and the two support bodies 23 are sheared and deformed in an inverted C shape while the space 5 is reduced and deformed. Thus, the distance between the bridge beams X is reduced. Since the expansion / contraction part 3 is being fixed to the bridge girder support part 21 with the volt | bolt 7, the generation | occurrence | production of the noise resulting from the swelling of the center part side is not caused. On the other hand, when the distance between the bridge girders X is expanded, the groove portions 34 and 35 are expanded and deformed, while the two support bodies 23 are sheared and deformed in a C shape while the space portion 5 is expanded and deformed. Follow the increase in distance.
[0020]
According to the road bridge expansion / contraction device described above, the expansion / contraction part 3 has a split structure that is detachable with respect to the load support part 1. Therefore, the expansion / contraction part 3 can be expanded / contracted when the expansion / contraction part 3 deteriorates and needs to be replaced during maintenance. Only part 3 can be replaced. Therefore, since the load support part 1 which has not deteriorated can be used as it is, the cost for maintenance can be reduced.
[0021]
Moreover, since only the center part of the extension part 3 in the road bridge extending direction is fixed to the inter-girder support part 21, when the distance between the bridge girder X is expanded or reduced, both side parts of the extension part 3 become the inter-girder support part 21. Therefore, the groove portions 34 and 35 can be effectively deformed to cope with a large amount of expansion and contraction.
[0022]
In the present invention, the support body 23 has a structure in which the rubber layers 24 and the steel plates 25 are alternately laminated. However, any structure can be adopted as long as it can be shear-deformed as described above when the distance between the bridge beams X is expanded or reduced. May be.
[0023]
【The invention's effect】
As described above, in the road bridge expansion / contraction device in which the expansion / contraction part is fixed on the load support part installed between the bridge girders, the load support part and the expansion / contraction part have a detachable divided structure. Since only the expansion / contraction part whose deterioration progresses faster than the part can be replaced, the maintenance cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a road bridge expansion / contraction device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Load support part 3 Expansion-contraction part 4,6,7 Bolt 5 Space part 11 Block body 12 One side surface 13 Protrusion part 14 Lower surface 15 Upper surface 21 Bridge support part 22 Bottom plate 23 Support body 24 Rubber layer 25 Steel plate 26 Load support plate 31 Elasticity Panel 32, 33 Steel plate for reinforcement 34, 35 Groove X Bridge girder Y Road bridge extension direction

Claims (3)

In a road bridge expansion / contraction device in which an expansion / contraction part is fixed on a load support part installed between both bridge girders, the load support part and the expansion / contraction part have a detachable division structure ,
The load support portion is composed of both block bodies for fixing the road bridge expansion / contraction device to both bridge girders, and a support portion between the bridge girders fixed between the block bodies,
The block body is made of a steel material and is formed in a rectangular parallelepiped shape extending in the width direction of the road bridge, and provided with a protruding portion for embedding and fixing the block body in the bridge girder on one side surface of the block body,
The support part between the bridge girders is mounted on the bridge girders and is fixed to the block body by bolts, and is fixed by vulcanization bonding with the block body and the space on the bottom plate. And is composed of both bearing bodies that can be deformed in the direction in which the road bridge extends, and a load support plate that is integrally constructed between the both bearing bodies,
Detachably fixed road bridge expansion joint with bolts the elastic portion to the block body and the load support plate. The road bridge expansion and contraction device according to claim 1, wherein the support body is a laminated rubber support body in which rubber layers and steel plates are alternately stacked . A plurality of reinforcing steel plates extending in the width direction of the road bridge are embedded in the upper and lower portions of the elastic board in the elastic board, respectively, and extended in the road bridge width direction on the upper and lower surfaces between the reinforcing steel plates of the elastic board. A groove is formed, and both ends of the elastic board in the direction of road bridge extension are detachably attached to the upper surface of the block body by bolts, and the center part of the road bridge extension direction is detachable from the upper surface of the load support plate by bolts. The road bridge expansion and contraction device according to claim 1 or 2, which is fixed to the frame.

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