JP2002371517A - Support for bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support for a bridge capable of suppressing downward sinking of an upper part structure such as the bridge, improving a difference in steps in a connection part of a bridge girder, and absorbing and reducing an earthquake force and having excellent restoration force to its original position. SOLUTION: This support for the bridge is constituted in such a way that a bearing shoe stone and a rubber support are combined to form an integral structure between an upper shoe stone attached to the upper part structure and a lower shoe stone attached to a lower part structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing for a bridge, and more particularly to a bearing for a bridge capable of improving a step at a connecting portion of a bridge girder and absorbing and reducing seismic force.

[0002]

2. Description of the Related Art In a bridge bearing, since it is interposed between an upper structure such as a bridge and a lower structure such as a pier, a vehicle when a vehicle passes over the upper structure such as a bridge. Due to the load, the bridge girder is pressed downward. In the conventional rubber bearing, the above-mentioned force is absorbed by the deformation of the rubber, which causes a step at the connecting portion of the bridge girder. Usually, a telescopic device (joint) is provided at the connection part of the bridge girder, and the above-mentioned step can be absorbed by tilting the telescopic device. However, the tilting of the telescopic device is not preferable because it gives a shock to a running vehicle.

[0003] On the other hand, there is a conventional one using a steel bearing shoe for a bridge support. However, bearing shoes
Since it does not have a damper function, there is a problem that there is no damping property against seismic force at the time of an earthquake, and there is a lack of restoring force for returning an upper structure such as a bridge to an original position at the time of an earthquake.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. The present invention suppresses sinking of an upper structure such as a bridge below, improves a step at a connecting portion of a bridge girder, and reduces an earthquake. It is an object of the present invention to provide a bridge support excellent in absorbing and reducing force and restoring force to an original position.

[0005]

According to the present invention, a bearing shoe and a rubber bearing are provided between an upper shoe attached to an upper structure and a lower shoe attached to a lower structure. The present invention provides a bearing for a bridge, characterized in that it is combined into a single structure.

According to the present invention, one end of the bearing shoe is formed of a flat surface, slidably in contact with the lower surface of the adjacent upper shoe, and the other end of the bearing shoe is formed of a spherical convex portion. A bridge bearing slidably in contact with a spherical recess on the upper surface of an adjacent lower shoe.

Further, according to the present invention, one end of the bearing shoe is formed of a flat surface, slidably in contact with an upper surface of an adjacent lower shoe, and the other end of the bearing shoe is formed of a spherical projection. And a bridge bearing slidably in contact with a spherical recess on the lower surface of an adjacent upper shoe.

Further, the present invention provides a bridge support in which two or more rubber bearings are arranged with the bearing shoe interposed therebetween.

The present invention also provides a bearing for a bridge, wherein the rubber bearing is a single-layer rubber bearing or a laminated rubber bearing constituted by alternately laminating a metal plate and a rubber layer.

[0010]

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

FIG. 1 shows a bridge support according to an embodiment of the present invention. In FIG. 1, an upper shoe 2 is attached to a lower surface of an upper structure 1 such as a bridge, and a lower shoe 4 is attached to an upper surface of a lower structure 3 such as an abutment or a pier by an anchor bolt (not shown). The upper shoe 2 and the lower shoe 4
Between them, two rubber bearings 6 are arranged with the bearing shoe 5 interposed therebetween, and are arranged in a line. The upper end of the bearing shoe 5 is flat and slidably contacts the lower surface of the adjacent upper shoe 2, and the other lower end is formed of a spherical convex portion. 4 and slidably in contact with the spherical concave portion on the upper surface. The two rubber bearings 6 are fixed to the upper shoe 2 and the lower shoe 4, respectively.
In the above-mentioned bridge support, the bearing shoe 5 and the two rubber bearings 6 are arranged so that the arrangement direction is the road width direction.

In the bridge bearing of the present invention, the bearing shoe 5 mainly supports the load of a superstructure such as a bridge or a vehicle passing therethrough, and the bridge girder is driven by the vehicle load when the vehicle passes. Of sinking down. Thereby, the step at the connection portion of the bridge girder can be improved. In addition, the downward bending deformation of the bridge girder supported by the bearing due to the vehicle load is absorbed by the spherical convex portion at the lower end sliding on the spherical concave portion on the upper surface of the lower shoe 4 adjacent thereto. On the other hand, the two rubber bearings 6 arranged so as to sandwich the above-mentioned bearing shoe 5 mainly make the sway of the quake during the earthquake, absorb the seismic force and suppress the sway immediately after the quake. It functions as a so-called isolator and damper. Further, the rubber bearing 6 has a function of returning the bridge girder to the original position by the elastic force of the rubber.

As described above, the bridge bearing of the present invention is constructed by incorporating the bearing shoe 5 and the rubber bearing 6 into one bridge bearing and arranging them in the width direction of the bridge. It is possible to combine the individual functions possessed organically and effectively. For this reason, the bridge bearing of the present invention functions in a well-balanced manner both in normal times and in the event of an earthquake.

Furthermore, compared to a case where only a bearing shoe is conventionally installed as a bridge bearing or a case where only a rubber bearing is installed, a single bearing has both functions. Mounting can be simplified, and costs can be reduced.

In the above embodiment, one bearing shoe 5
And a bridge bearing in which two rubber bearings 6 are combined with the rubber bearing 6 interposed therebetween. In the present invention, a plurality of bearing shoes 5 and rubber bearings 6 may be combined according to the purpose.

As shown in FIG. 1, the bearing shoe 5 has an upper end formed of a flat surface, slidably in contact with an adjacent lower surface of the upper shoe 2, and a lower end formed of a spherical projection. Even when the upper shoe 2 is slidably in contact with the spherical recess on the upper surface of the adjacent lower shoe 4, the upper end, which is upside down, is formed of a spherical convex portion. The configuration may be such that the lower end portion is made of a flat surface and slidably contacts the adjacent upper surface of the lower shoe 4 while being slidably in contact with the spherical concave portion on the lower surface. In either configuration,
This is because a similar function and effect is exhibited.

By making the bearing shoe 5 and the upper shoe 2 or the lower shoe 4 slidable, it is possible to smoothly move the upper structure accompanying the deformation of the rubber bearing during an earthquake.

The cross-sectional shape of the bearing shoe 5 as viewed from above is not particularly limited, and may be any suitable shape such as a circle, an ellipse, and a polygon.
Nickel chrome molybdenum steel or the like can be used as long as it is normally used for bearing shoes.

The rubber bearing 6 is preferably a single-layer rubber bearing or a laminated rubber bearing formed by alternately laminating a metal plate and a rubber layer, and more preferably a laminated rubber bearing having a high ratio of the rubber layer. In the bridge support of the present invention, since the bearing shoe 5 mainly bears the load support of the upper structure and the like as described above, the rubber bearing 6 preferably has high isolator and damper functions.

[0020]

As described above, according to the present invention, a bearing shoe and a rubber bearing are combined between an upper shoe attached to an upper structure and a lower shoe attached to a lower structure to form an integral structure. As a result, it is possible to suppress the sinking of the upper structure such as bridges below, improve the level difference at the connection part of the bridge girder, and provide a bridge support that is excellent in absorbing and reducing seismic force and restoring force to the original position it can.

[Brief description of the drawings]

FIG. 1 shows a cross-sectional view of a bridge bearing according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper structure 2 Upper shoe 3 Lower structure 4 Lower shoe 5 Bearing shoe 6 Rubber bearing

Claims (5)

[Claims] 1. A bridge for a bridge, wherein a bearing shoe and a rubber bearing are combined to form an integral structure between an upper shoe attached to an upper structure and a lower shoe attached to a lower structure. Bearing. 2. One end of the bearing shoe is made of a flat surface and slidably contacts an adjacent upper shoe lower surface.
The other end of the bearing shoe comprises a spherical projection,
The bridge support according to claim 1, wherein the bearing is slidably in contact with a spherical concave portion on an upper surface of an adjacent lower shoe. 3. One end of the bearing shoe is made of a flat surface and slidably contacts an upper surface of an adjacent lower shoe.
The other end of the bearing shoe comprises a spherical projection,
The bridge support according to claim 1, wherein the bearing is slidably in contact with a spherical concave portion on the lower surface of the adjacent upper shoe. 4. The bridge bearing according to claim 1, wherein two or more rubber bearings are arranged with the bearing shoe interposed therebetween. 5. The bridge bearing according to claim 1, wherein the rubber bearing is a single-layer rubber bearing or a laminated rubber bearing formed by alternately laminating a metal plate and a rubber layer.