Rubber Bearing Pad for Bridge Construction to Korea

Hengshui Jianfeng rubber bearing is made of multi layers of natural rubber and thin steel plate mosaic, bonding, curing and become a kind of bridge bearing products.The types of rubber bearings have enough vertical stiffness to withstand the vertical load, and the upper structure of the pressure reliably transfer to the pier; have good flexibility to adapt to the rotation of the beam end; larger shear deformation to meet the horizontal displacement of superstructure.

The structure and performance of the plate type rubber bearing

Bridge plate rubber support by multilayer rubber sheets and thin plate vulcanization, adhesive, it has enough vertical stiffness, the upper structure of the reaction force of reliable transfer to the pier; good elasticity, to adapt to the rotation of the beam end; and larger shear deformation ability, to satisfy the upper structure of the horizontal displacement.
 
The Teflon plate a layer of 1.5mm-3mm in the laminated rubber bearing is stuck to the surface of complex, made into PTFE sliding plate rubber support. In addition to the vertical stiffness and elastic deformation, under vertical load and adapt to the rotation of the beam end, due to the low friction coefficient of PTFE plate, the girder end in PTFE surface free sliding, horizontal displacement is not restricted; is especially suitable for medium, small load, large displacement amount of bridge.
 
Plate rubber bearing not only has excellent technical performance, but also has the advantages of simple structure, low cost, no need of maintenance, easy replacement, buffer isolation, low building height and so on.

The scope of application

1, ordinary bridge rubber bearings used in the span of less than 30 m, small amount of displacement of the bridge. In different plane shapes applicable to different bridge span structure, the quadrature bridge with rectangular bearings; curved bridge, skew bridge and cylindrical bridge pier with round support.
 
2, PTFE plate type rubber support for bridge applicable to large span, multi span continuous, simply supported continuous plate structure of large scale displacement of bridge. It can also be used for continuous beam top permanence T type beam traverse slider. Rectangular, round PTFE laminated rubber bearing application of non stop and rectangle, rounded Cape through the laminated rubber bearing is the same.

The bearing capacity of the rubber bearing of the bridge depends on the following three conditions

(1) rubber itself crushed or cut bad;
(2) rubber is produced more than the use of the compression deformation and shear deformation;
(3) compression support material (concrete, steel or other) is the rubber outward reverse horizontal shear tensile or shear when support and rubber contact surface between the slip.
Through a lot of experiments, it is proved that the bridge rubber bearing surface of the rubber with compressive strength and shear strength, rarely be crushed or cut bad. Here to introduce rubber bearings, rubber material is artificial synthesis of chloroprene rubber (also known as NAT rubber and vulcanized natural rubber. By using butyl rubber and rubber mix. When rubber bearing strength calculation of allowable stress is determined by (2), (3) under the condition of bearing capacity.