Developed Shear reinforcing Rubber Bearing
ICON > Introduction of item > Bridge Bearing > Developed Shear reinforcing Rubber Bearing

전단보강 일체형 탄성받침 (DSRB)

Developed Shear reinforcing Rubber Bearing

Elastomeric bearing (DSRB) is a bridge bearing for support, which is composed of reinforcing steel plates and rubbers in laminated layers. It reinforces a hardness of vertical load by steel plate and accepts a horizontal displacement and rotation of horizontal load by using elasticity of rubber. .

At the first stage of developing elastomeric bearing (DSRB), "KS F 4420 B Type" was mainly used, of which upper / lower plates and elastomeric pad are separated. This type caused many troubles like roll-over, breakaway of elastomeric pad by sliding. Recently, "KS F 4420 C Type" is mainly used, of which upper / lower plates and elastomeric pads are combined in layers.
No Name Material
1 PAD CR or NR
2 Upper Plate SM490 Or equal or more
3 Piston SM490 Or equal or more
4 Fixing Bolt 10.9 Grade Or equal or more
5 Anchor Socket SS400 Or equal or more


A bridge structure with a bridge bearing is a structure in which the load generated at the upper portion is transmitted to the lower portion through the anchor of the bridge bearing. Therefore, a part of the upper end of the anchor socket, which is to be inserted into the lower structure, should be inserted into the lower plate so as to secure sufficient shear rigidity for the horizontal force.
However, if the anchor socket is inserted into the lower plate, when it is replaced, the lifting height of the anchor socket is required to be higher than the depth of the anchor socket. And it eventually causes a failure of replacing elastomeric bearings. Most of the elastomeric bearings currently in use are simply bolted to the anchor socket without being inserted into the lower plate of elastomeric bearings. Such an anchor socket having a large shear resistance has a problem in that the connection bolt for connecting the anchor socket is resistant to the shear, not the shear resistance of the anchor socket
This problem is disadvantageous in securing the stability that the connecting bolt must support up to a large horizontal force generated in an earthquake, and the bolt may fail to resist the horizontal force and may even break. When the anchor socket is fixed by the simple bolt fastening, bolt loosening occurs due to frequent vibration due to live load acting on the bridge support, which leads to the detachment of the bridge bearings. In order to solve these problems, shear reinforcement is applied to the anchor inner shear to prevent the problem of replacing the base. At the same time, the bolt loosening by the vibration is prevented by applying the anchor bolt using the double screw


Fixed directional Axis Directiona movable Axis Directiona movable Multi directional movable