Material selection for rubber bridge bearings
Bridge supports are made from a combination of several materials, and the selection of appropriate rubber and other materials is critical.
(1) Glue selection
The choice of rubber type should be considered in terms of the requirements of use and environmental conditions. It usually includes a certain compressive strength, good elasticity, resistance to natural aging, and long service life (not shorter than the overhaul period of the bridge). At present, the most concentrated rubber types are natural rubber, neoprene and EPDM. They have their own advantages: natural rubber has good comprehensive mechanical properties and low temperature resistance, especially suitable for use in cold areas; neoprene has excellent weather resistance and wide applicability, and its use ranks first; EPDM rubber The comprehensive aging resistance is the most ideal, but it is expensive, and its use is not too broad for cost-effective reasons.
(2) Other materials
Other materials include steel plates and Teflon. The steel plate is made of A3 steel with thickness of 2mm. The specific thickness is determined according to the specifications of the support. After the sandblasting treatment, the adhesive is applied. The relative density of polytetrafluoroethylene is 2.2, the thickness is more than 2mm, and the surface roughness is less than O. 8 μm.
Performance requirements for rubber bridge bearings
Because of the long-term load and long-term use in outdoor conditions, it should have high mechanical properties and good weathering resistance.
