The structure of seismic isolation products for bridges mainly includes seismic isolation rubber bearings, and its specific structure is as follows:
Basic composition: Seismic isolation rubber bearings are composed of multiple layers of rubber and multiple layers of steel plates stacked alternately. Usually include multiple parts such as upper cover plate, lower bearing plate, seismic isolation rubber and bolts. The upper cover plate is used to support the upper load of the building or bridge, and the lower bearing plate is connected to the foundation through the bearing to transfer weight and load. Seismic isolation rubber is a key part, usually made of high-tension rubber, with compression and tension properties, which can effectively reduce the impact of earthquakes on building structures.
Type: Seismic isolation rubber bearings can be divided into building seismic isolation bearings and bridge seismic isolation bearings according to their use. According to the manufacturing process, they can be divided into three types: natural rubber seismic isolation bearings (lead-free type GZP/LNR), lead core rubber seismic isolation bearings (lead type LRB/GZY), and high damping rubber bearings (HDR). Natural rubber isolation bearings use natural rubber as the main raw material, lead rubber isolation bearings contain lead cores to improve damping ratio and stiffness, and high damping rubber bearings add other elements to the rubber to improve damping properties.