Lead Core Rubber Isolation Bearing for Highway and Bridge

Product Description

Lisa Kang
lisa(at)shuanglinrubber.com
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Lead Core Rubber Isolation Bearing for Highway and Bridge


Description
Lead Rubber Bearing are rubber bearings made up of alternate layers of steel laminates and hot vulcanized rubber with a cilindrical central lead core. The rubber in the bearing acts as a spring. It is very soft laterally but very stiff vertically. The high vertical stiffness is achieved by having thin layers of rubber reinforced by steel shims. These two characteristics allow the bearing to move laterally with relatively low stiffness yet carry significant axial load due to their high vertical stiffness. The lead core provides damping by deforming plastically when the isolator moves laterally in an earthquake.  


Application
Lead rubber bearings were installed under the girders of the isolated bridges. The bearings are supplied with guide bars that impede transverse movement. Lead-rubber bearings were chosen for the seismic isolation of these bridges. This type of bearing provides a good balance between damping and cost. Since all components are vulcanized inside the rubber, no special maintenance is required beyond that of laminated bearings.

Lead Core Rubber Isolation Bearing for Highway and Bridge

Features
All steel for lead rubber bearings are cut to exacting tolerances by laser. Both top and bottom end plates are machined by computer-controlled milling machines that give high production throughput and accuracy. All steel plates to be bonded to rubber shall be sandblast to remove all rust and sharp edges (rounded and chamfered), completely dip and thoroughly clean in degreasing agent, apply bonding adhesive primer, and apply bonding adhesive top coat and keep at the oven at control temperature before moulding.


Lead Core Rubber Isolation Bearing for Highway and Bridge