Rubber Bearings for Bridges

Rubber Bearings for Bridges.

1. Rubber Bearings for Bridges is widely used in earthquake resistent engineering such as bridges, buildings and other building construction.

2. Rubber bearings is installed as a Damping Equipment under building structures so as to control the
Tremor of structure against the loads of earthquake.


1. Structure and performance of Rubber Bearings

Rubber Bearings is sulfurized and stuck gether by several layers of rubber sheet and thin steel plate. It has sufficient vertical rigidity, and can reliably transfer the counterforce on the upper structures to pier platform; It has fine elasticity, and can adapt to the rotation of beam end; It has great shearing deformation capacity, and can satisfy the horizontal displacement of the upper structures.

A dhere a layer of 1.5mm to 3mm thick polytetrafluoroethylene plate on the surface of the above Rubber Bearings, and polytetrafluoroethylene sliding Tetrafluoro plate Bearing is formed. Besides vertical rigidity and elastic deformation, able to endure vertical load and suit to the rotation of beam end, the beam end can freely slide on the surface of the tetrafluoro plate due to the low friction coefficient of the polytetrafluoroethylene plate, and the horizontal displacement is not limited; It specially suit to bridges with medium or low load and large displancement.

Tetrafluoro plate Bearings not only has fine technical performances, but also has simple structure, low price, no maintenance, easy to change, buffering and shock is isolating, low building height, and other characteristics. Therefore, it is welcomed and widely used in bridges.


2. Applicability of Rubber Bearings

2.1 General Rubber Bearing suits to bridges with span less than 30m and small displacement. Different flat shape suits to different bridge span structures: Orthogonal bridges adopt rectangular bearing; Curvilinear bridges, obique crossing bridges and cylindrical pier bridges adopt circular bearing.

2.2 Tetrafluoro Bridge Bearing suits to bridges with large span, several spans in continuous, with simply supported beam and continuous plates strutures, and large displacement. It can still be used as the sliding block in pushing of continuous beam and cross sliding of T-shaped beam. The application of rectangular and circular tetrafloro Elastomeric Laminated Bearings are the same with rectangular and circular general Bridge Bearing, separately.

3. Classification and representation methods of plate type Rubber bearing

(1) Classification as shapes of rubber bearing
A. Rectangular plate type rubber bearing
B. Circular plate type rubber bearing
(2) Classification as applicable temperature of adhesive varieties of rubber bearing
A. Neoprene bearing(applicable temperature -25~60° C)
B. NR bearing (applicable temperature -35~60° C)
C. EPDM bearing (applicable temperature -40~60° C )
(3) Classification as structure style of rubber bearing
A, . General plate type rubber bearing
B. Tetrafluoro sliding plate type rubber bearing
4. The operating principle of Rubber bearing
The main function of Rubber bearing is reliably transfer the counterforce on the upper structures to pier platform, and meet the need deformation of beam body ( horizontal displacement and rotation). It has sufficient vertical rigidity so that can guarantee the lesser deformation of bearing in the effect of maximum vertical load. It has fine elasticity at horizontal direction, and can adapt the horizontal displacement due to the effects of braking force, temperature, contraction of concrete, creep and load, and at the same time, it can adapt the rotation of beam end.
5. Features:
1. Fine technical performance;
2. Simple structure;
3. Low price;
4. No maintenance;
5, . Easy to change;
6. Buffering and shock isolating;
7. Low building height.