JP2003193411A - Highway-bridge expansion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highway-bridge expansion device, in which a maintenance cost can be reduced, in the highway-bridge expansion device in which an expansion section is fixed onto a load bearing section. <P>SOLUTION: In the highway-bridge expansion device in which the expansion section 3 is fixed onto the load bearing section 1 installed between both bridge girders X, the load bearing section 1 and the expansion section 3 are formed in a detachable split structure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field 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]

2. Description of the Related Art Conventionally, as a road bridge expansion / 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 portions of a rubber plate, respectively. It is generally known that a groove portion extending in the width direction of a road bridge is formed on the upper and lower surfaces of a rubber plate between reinforcing steel plates. A road bridge expansion / contraction device having such a rubber plate expansion / contraction device swells when the distance between both bridge girders decreases due to seasonal temperature changes, and the central part of the rubber plate swells, and when the vehicle travels on it, it rises. There was a problem that noise was generated because the part was pushed down and hit the bridge girder.

Therefore, in recent years, as a measure against the above, a load supporting portion is installed between both bridge girders, and the central portion side of the rising and contracting portion is fixed to the load supporting portion so that the load supporting portion and the elastic portion are integrated. A road bridge expansion device has been proposed. The load supporting part is constructed by laying the load supporting steel plates on both bearings that are deformed when a force in the shearing direction is applied. I have to. Also, when the distance between both bridge girders expands and contracts,
By deforming the support together with the expansion and contraction part, it is possible to accommodate expansion and contraction between the bridge girders.

By the way, the expansion / contraction portion deteriorates more quickly due to wear and the like due to running of the vehicle than the load supporting portion installed on the lower side thereof. 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 as a result of the integrated structure of the expansion / contraction part and the load support part. There is a problem that the cost becomes high.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a road bridge expansion / contraction device in which an expansion / contraction part is fixed on a load support part.
It is to provide a road bridge expansion / contraction device capable of reducing maintenance costs.

[0006]

Means for Solving the Problems The present invention for achieving the above object provides a road bridge expansion / contraction device in which an expansion / contraction part is fixed on a load support part installed between both bridge girders. It is characterized by a detachable split structure.

Since the expandable portion and the load supporting portion are detachable from each other in this way, only the expandable portion can be replaced when the expandable portion deteriorates and needs to be replaced.
Therefore, it is not necessary to replace the entire road bridge expansion / contraction device as in the conventional case, and the maintenance cost can be reduced.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The configuration of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an example of a road bridge expansion / contraction device according to the present invention. The road bridge expansion / contraction device according to the load support section 1 installed between both bridge girders X and the expansion / contraction of the distance between the bridge girders X. It is provided with a stretchable portion 3 that stretches.

The load supporting portion 1 is composed of both block bodies 11 for fixing the road bridge expansion / contraction device to both bridge girders X, and an inter-girder support portion 21 fixed between both block bodies 11.

Both block bodies 11 are made of steel material,
It has a rectangular parallelepiped shape that extends in the width direction of the road bridge. On one side surface 12 of the block body 11, projections 13 embedded and fixed in the bridge girder X are provided at predetermined intervals in the width direction of the road bridge.

In the bridge girder support portion 21, both support bodies 23 are fixedly mounted on a bottom plate 22 made of a steel plate placed on each bridge girder X, respectively. Each support 23 has a rubber layer 24 and a steel plate 2
5 and 5 are alternately laminated, and when the distance between the bridge girders X expands and contracts and a shearing force acts in the road bridge extension direction Y, in the shearing direction, that is, in the road bridge extension direction Y. It can be transformed.

A load support plate 26 made of a steel plate is installed between the two bearings 23. The bottom plate 22, the support member 23, and the load support plate 26 are adhered to each other when the support member 23 is vulcanized to form an integral structure.

By fixing the bottom plate 22 to the lower surface 14 of each block body 11 with the bolts 4, the space portion 5 is interposed between the support body 23 and the block body 11, and the bridge girder support portion 21 is fixed to both block bodies. It is fixed at 11.

The expansion / contraction section 3 installed on the load supporting section 1 is
An elastic plate 31 made of a rubber plate is provided, and a plurality of reinforcing steel plates 32, 33 extending in the width direction of the road bridge are embedded in the upper and lower parts of the elastic plate 31, respectively. A plurality of groove portions 34 extending along the reinforcing steel plate 32 in the width direction of the road bridge are formed between the reinforcing steel plates 32 on the upper surface 31 a of the elastic board 31. A plurality of groove portions 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 31b of the elastic board 31.

By expanding and contracting the groove portions 34 and 35 in accordance with the expansion and contraction of the distance between the bridge girders X, the expansion and contraction portion 3 can be expanded and contracted. Bolt holes 36 and 37 for fixing the expandable portion 3 on the load supporting portion 1 are formed at both ends and a central portion of the elastic plate 31 in the road bridge extending direction at predetermined intervals along the road bridge width direction. It is set up.

An elastic plate 3 is provided between the upper surfaces 15 of both block bodies 11.
1 is placed on the elastic plate 31 by the bolts 6 inserted into the bolt holes 36 at both ends of the road bridge extending direction.
1 is detachably fixed. Further, the elastic plate 31 is detachably fixed to the load supporting plate 26 by the bolt 7 inserted into the bolt hole 37 at the central portion of the road bridge extending direction.

The expandable portion 3 can be removed from the load supporting portion 1 by removing the bolts 6 and 7, and has a split structure which is detachable from the load supporting portion 1.

In the above-mentioned road bridge expansion / contraction device, when the distance between the bridge girders X is reduced, the grooves 34, 35 are contracted and deformed, while the space 23 is contracted and deformed, and the two bearings 23 are sheared in an inverted V shape. The deformation follows the reduction of the distance between the bridge girders X. Since the expansion / contraction part 3 is fixed to the inter-girder support part 21 by the bolts 7, the generation of noise due to the swelling on the central 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 support portions 23 are sheared and deformed in a V shape while the space portion 5 is expanded and deformed, so that the bridge girders X and Follow the expansion of the distance.

According to the above-mentioned road bridge expansion / contraction device, since the expansion / contraction part 3 has a detachable structure with respect to the load support part 1, the expansion / contraction part 3 deteriorates during maintenance and must be replaced. At this time, only the expansion / contraction part 3 can be replaced. Therefore, since the load supporting portion 1 which has not deteriorated can be used as it is, the cost for maintenance can be reduced.

Further, since only the central portion of the extension portion 3 in the direction of extension of the road bridge is fixed to the inter-girder bearing portion 21, when the distance between the bridge girders X is increased or decreased, both sides of the extension portion 3 are separated by the bridge girders. Since it can slide and deform with respect to the support portion 21, the groove portions 34, 35
Can be effectively deformed to accommodate a large amount of expansion and contraction.

In the present invention, the support member 23 has a structure in which the rubber layers 24 and the steel plates 25 are alternately laminated, but any member can be sheared as described above when the distance between the bridge girders X is increased or decreased. A configuration may be adopted.

[0023]

As described above, the present invention provides a road bridge expansion / contraction device in which an expansion / contraction part is fixed on a load support part installed between both bridge girders, and has a split structure in which the load support part and the expansion / contraction part are detachable. Therefore, it is possible to replace only the expansion / contraction portion that deteriorates faster than the load support portion, and thus it is possible to reduce maintenance cost.

[Brief description of drawings]

FIG. 1 is a 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 projection part 14 lower surface 15 upper surface 21 bridge girder support part 22 bottom plate 23 support body 24 rubber layer 25 steel plate 26 load support plate 31 elasticity Board 32,33 Reinforcing steel plate 34,35 Groove X Bridge girder Y Road bridge extension direction

Claims (7)

[Claims] 1. A road bridge expansion / contraction device in which an expansion / contraction part is fixed on a load support part installed between both bridge girders, wherein the load support part and the expansion / contraction part have a detachable split structure. 2. The road bridge expansion / contraction according to claim 1, wherein the load support portion includes both block bodies for fixing the road bridge expansion / contraction device to both bridge girders, and bridge girder support parts fixed between the block bodies. apparatus. 3. The road bridge expansion / contraction device according to claim 2, wherein the expansion / contraction part is detachably fixed to the block body and the bridge girder support part, respectively. 4. The road bridge expansion / contraction device according to claim 2, wherein a protrusion that is embedded and fixed in the bridge girder is provided on one side surface of the block body. 5. A bottom plate in which the bridge girder support portion is placed on the both bridge girders and fixed to the block body, and both support bodies fixed to the bottom plate and deformable in a road bridge extending direction. The road bridge expansion / contraction device according to claim 2, 3 or 4, further comprising a load support plate integrally installed between the two bearings. 6. The road bridge expansion / contraction device according to claim 5, wherein the support is a laminated rubber support in which rubber layers and steel plates are alternately laminated. 7. The expansion / contraction portion is formed by embedding a plurality of reinforcing steel plates extending in the width direction of the road bridge in an upper part and a lower part of an elastic plate, and a road is provided on upper and lower surfaces of the elastic plate between the reinforcing steel plates. A groove extending in the bridge width direction is formed, and both ends of the elastic board in the road bridge extension direction are bolted to the upper surface of the block body, and a central portion of the road bridge extension direction is bolted to the upper surface of the load support plate. 7. The road bridge expansion and contraction device according to claim 5 or 6, which is detachably fixed to each.