Lead Rubber Bearing Base Isolation is a seismic isolation bearing designed to reduce earthquake forces transmitted to bridge and structural systems. The bearing consists of laminated rubber layers reinforced with internal steel plates and one or more lead cores installed in the center.
During seismic events, the laminated rubber layers provide flexibility and horizontal displacement capacity, while the lead core yields under shear deformation and dissipates seismic energy through plastic deformation. This combined mechanism significantly reduces structural vibration and improves overall earthquake resistance.
Lead rubber bearings are widely used in highway bridges, railway bridges, urban viaducts, and seismic-resistant infrastructure projects.
Key Features
- High seismic energy dissipation capacity
- Effective reduction of earthquake-induced structural forces
- Stable vertical load-bearing performance
- Large horizontal displacement capability
- Reliable mechanical performance under cyclic loading
- Long service life with minimal maintenance
The integration of laminated elastomer layers and lead core damping allows the bearing to control structural movement while absorbing seismic energy efficiently.
Design Standards
The product is designed and manufactured according to relevant bridge isolation standards:
GB 20688.2-2006 – Rubber Bearings Part 2: Seismic Isolation Rubber Bearings for Bridges
JT/T 822-2011 – Lead Rubber Bearings for Highway Bridges
Custom designs can also be developed according to international bridge engineering specifications and project drawings.
Structural Composition
A typical Lead Rubber Bearing consists of the following main components:
- High-strength laminated rubber layers
- Embedded steel reinforcing plates
- Central lead core (single or multiple cores)
- Top and bottom steel connection plates
This structure ensures vertical stiffness, horizontal flexibility, and effective seismic energy dissipation.
Basic Technical Specifications
|
Item |
Specification |
|
Product Name |
Lead Rubber Bearing Base Isolation |
|
Bearing Type |
Seismic Isolation Bearing |
|
Core Structure |
Laminated Rubber with Lead Core |
|
Shape Options |
Circular / Rectangular |
|
Function |
Load Transfer & Seismic Isolation |
|
Energy Dissipation |
Lead Core Plastic Deformation |
|
Application |
Bridges & Seismic Infrastructure |
|
Custom Design |
Available Based on Project Requirements |
Applications
Lead rubber isolation bearings are widely used in infrastructure projects requiring seismic protection, including:
- Highway bridges
- Railway bridges
- Urban elevated bridges
- Seismic-resistant transportation infrastructure
- Infrastructure in earthquake-prone regions
FAQ
Q1: What is the function of the lead core in the bearing?
A: The lead core provides additional damping by absorbing and dissipating seismic energy during earthquakes.
Q2: Can lead rubber bearings support heavy bridge loads?
A: Yes. The laminated steel-reinforced rubber structure provides high vertical load capacity suitable for bridge applications.
Q3: Can the bearing size be customized?
A: Yes. Dimensions and load capacity can be customized based on bridge design requirements.
Q4: Are these bearings suitable for seismic zones?
A: Yes. Lead rubber bearings are specifically designed to improve seismic performance in earthquake-prone areas.
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