JP3945853B2 - Sliding rubber bearing device for bridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sliding rubber bearing device for a bridge, and more specifically, a horizontal force applied in a direction perpendicular to the direction of the bridge axis at the time of an earthquake is gradually transmitted and attenuated by deformation of a rubber-like elastic bearing body. The present invention relates to a sliding rubber bearing device for a bridge that can reduce the stress load on the lower support structure.
[0002]
[Prior art]
Conventionally, rubber-like elastic bearings have been installed between upper structures such as concrete bridge girders and lower support structures such as abutments and piers, and vibration energy from the upper structures, rolls, and upper structures It is configured to absorb and reduce expansion and contraction.
By the way, the conventional sliding rubber bearing device for a bridge is movable in the direction of the bridge axis (longitudinal direction of the bridge girder) by sliding the upper rod (upper metal plate) and the upper surface of the rubber-like elastic bearing body. In the direction orthogonal to the direction (the width direction of the bridge girder), the movement is generally restricted by a side block attached to the lower rod (lower metal plate).
[0003]
[Problems to be solved by the invention]
However, in the sliding rubber bearing device with the above structure, the horizontal force in the direction perpendicular to the bridge axis direction is transmitted as an impact force to the pier or abutment because the side block collides with the upper arm. Therefore, there is a possibility that an excessive force may be instantaneously applied, and there is a problem that the side block breaks and the upper structure falls or the pier or the abutment is damaged.
[0004]
The present invention has been devised by paying attention to such a conventional problem. With a simple configuration, the horizontal force applied in the direction perpendicular to the bridge axis direction at the time of an earthquake is gradually increased by deformation of the rubber-like elastic support body. It is possible to reduce the stress load on the lower support structure of the bridge by transmitting and dampening, and also effectively prevent the upper structure from falling off by holding the upper arm against vertical vibrations. An object of the present invention is to provide a sliding rubber bearing device for a bridge.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention fixes an intermediate plate on the upper surface of the rubber-like elastic support, and the intermediate plate and the upper rod slide only in the direction of the bridge axis between the intermediate plate and the upper rod which are in sliding contact. The rubber-like restricting means for restricting movement is provided by drilling a key groove along the bridge axis direction between the intermediate plate and the upper collar and fitting a shear key into the key groove. A restriction block that has a U-shaped locking member sandwiching the upper rod and the intermediate plate on both sides in a direction perpendicular to the bridge axis direction of the elastic bearing body and regulates the vertical movement of the upper rod. The gist of the present invention is that the block member constituting the restriction block which is installed and fixed on the lower arm is configured to prevent the rubber-like elastic support body from moving in the direction perpendicular to the bridge axis direction. is there.
[0006]
Moreover, it is also possible to interpose a low friction member such as a stainless steel plate and polytetrafluoroethylene (PTFE) on the sliding surface between the upper collar and the intermediate plate.
The present invention is configured as described above, and is provided with a restricting means for restricting the intermediate plate and the upper collar so as to move only in the direction of the bridge axis between the intermediate plate and the upper fence, and the bridge of the rubber-like elastic bearing body. By providing restriction blocks that restrict the vertical movement of the upper arm on both sides in the direction orthogonal to the axial direction, the horizontal force applied in the direction orthogonal to the bridge axis direction at the time of an earthquake is caused by deformation of the rubber-like elastic bearing body. It is possible to reduce the stress load on the lower support structure of the bridge by gradually transmitting and attenuating it, and it is also effective to hold the upper heel against vertical vibration and drop the upper structure Can be prevented.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a half sectional view of a sliding rubber bearing device for a bridge used in a bridge end portion in a direction orthogonal to a bridge axis direction (bridge girder width direction) showing an embodiment of the present invention, and FIG. 2 is a plan view of FIG. FIG. 3 is a half sectional view of a sliding rubber bearing device for a bridge used at a bridge end in the bridge axis direction (longitudinal direction of the bridge girder). The sliding rubber bearing device for a bridge is an upper structure 1 such as a concrete bridge girder. Between the upper steel plate 2 (upper metal plate) attached to the lower steel plate 4 (lower metal plate) attached to the lower support structure 3 such as an abutment or a pier, etc. A rubber-like elastic bearing body 7 formed integrally by laminating the sheet 6 is installed.
[0008]
An intermediate plate 8 is fixed to the upper surface of the rubber-like elastic support 7 via a fastening member (not shown) such as vulcanization adhesion or a bolt, and the intermediate plate 8 is interposed between the intermediate plate 8 and the upper collar 2. And the control means 9 which controls so that the upper collar 2 may move only to a bridge axis direction (Y direction of a figure) is provided. That is, the movement of the intermediate plate 8 and the upper arm 2 in the direction orthogonal to the bridge axis direction (X direction in the figure) is restricted by the horizontal force applied in the direction orthogonal to the bridge axis direction (X direction in the figure) at the time of the earthquake. It is regulated by means 9.
[0009]
The regulating means 9 has a key groove 10 formed along the bridge axis direction (Y direction in the figure) at the center of the sliding surface between the intermediate plate 8 and the upper rod 2, and a shear key 11 is formed in the key groove 10. Is fitted. A shear key 14 is also fitted through a key groove 13 at the center of the sliding contact surface between the lower plate 12 and the lower rod 4 attached to the lower surface of the rubber-like elastic support 7.
[0010]
A low friction member 15 made of a stainless steel plate 15a and polytetrafluoroethylene (PTFE) 15b is provided on the sliding contact surface between the intermediate plate 8 and the upper collar 2 so as to slide smoothly.
On both sides of the rubber-like elastic support body 7 in the direction orthogonal to the bridge axis direction, a restriction block 16 for restricting the vertical movement of the upper collar 2 is provided. The block member 16a is provided in order to prevent the rubber-like elastic support body 7 from moving in a direction perpendicular to the bridge axis direction (or protection of the joint part) at all times or against slight earthquake motion, and in the event of a large earthquake. In contrast, it is designed to be destroyed.
[0011]
Further, the locking member 16b having a U-shaped cross-section is locked and fixed so as to cover both side edges 2a of the upper collar 2 from above.
The present invention is configured as described above, and the restricting means 9 restricts the intermediate plate 8 and the upper rod 2 to move only in the bridge axis direction (Y direction in the figure) between the intermediate plate 8 and the upper rod 2. In addition, at both sides of the rubber-like elastic support body 7 in the direction orthogonal to the bridge axis direction (X direction in the figure), the restriction blocks 16 that restrict the vertical movement of the upper rod 2 are provided, The horizontal force applied in the direction orthogonal to the bridge axis direction (X direction in the figure) is gradually transmitted and attenuated by the deformation of the rubber-like elastic support 7 to reduce the stress load on the lower support structure 3 of the bridge. It can be done.
[0012]
Further, the upper structure 1 is effectively prevented from falling off by being fixedly held by the locking member 16b having a U-shaped cross section against vibrations in the vertical direction during an earthquake.
[0013]
【The invention's effect】
In the present invention, the intermediate plate is fixed to the upper surface of the rubber-like elastic support body as described above, and the intermediate plate and the upper flange are slidably moved only in the bridge axis direction between the intermediate plate and the upper flange in sliding contact. A restricting means for restricting the rubber-like elastic support body is provided by forming a key groove between the intermediate plate and the upper collar along the bridge axis direction and fitting a shear key into the key groove . On both sides in a direction perpendicular to the bridge axis direction, there are provided restriction blocks that have a U-shaped locking member that sandwiches the upper rod and the intermediate plate in the vertical direction and regulates the vertical movement of the upper rod, Since the block member that constitutes the restriction block that is erected and fixed above is configured to prevent the rubber-like elastic bearing body from moving in the direction perpendicular to the bridge axis direction, the bridge in the event of an earthquake can be obtained with a simple configuration. The horizontal force applied in the direction perpendicular to the axial direction is rubbery. It is possible to reduce the stress burden on the lower support structure of the bridge by gradually transmitting and attenuating due to the deformation of the elastic support body, and holding the upper arm against the vertical vibration, the upper structure This has the effect of effectively preventing the dropout.
[Brief description of the drawings]
FIG. 1 is a half sectional view of a sliding rubber bearing device for a bridge used at a bridge end portion in a direction orthogonal to a bridge axis direction according to an embodiment of the present invention.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is a half sectional view of a sliding rubber bearing device for a bridge used at a bridge end in a bridge axis direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper structure 2 Upper rod 3 Lower support structure 4 Lower rod 5 Steel plate 6 Unvulcanized rubber sheet 7 Rubber-like elastic support body 8 Intermediate plate 9 Control means 10 Keyway 11 Shear key 12 Lower plate 13 Keyway 14 Shear key 15 Low friction member 15a Stainless steel plate 15b Polytetrafluoroethylene (PTFE)
16 Restriction block 16a Block member 16b Locking member 2a Both side edges of upper collar

Claims (2)

A sliding rubber bearing device for a bridge, wherein a rubber-like elastic bearing is interposed between an upper rod attached to an upper structure and a lower rod attached to a lower support structure. An intermediate plate is fixed to the upper surface of the intermediate plate, and a regulating means for restricting the intermediate plate and the upper rod so that they are slidably moved only in the bridge axis direction between the intermediate plate and the upper rod in sliding contact with each other. A key groove is drilled along the bridge axis direction between the flange and a shear key is fitted in the key groove, and is provided on both sides of the rubber-like elastic bearing body in a direction perpendicular to the bridge axis direction. A restriction block that has a U-shaped locking member that sandwiches the upper collar and the intermediate plate up and down and regulates the vertical movement of the upper collar, and the regulation block that is erected and fixed on the lower collar The direction of the bridge axis of the rubber-like elastic bearing by the block member Configuration the bridge for sliding rubber bearing device so as to prevent movement of the orthogonal directions.   The sliding rubber bearing device for a bridge according to claim 1, wherein a low friction member is interposed on a sliding surface between the upper collar and the intermediate plate.

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