Seismic Isolation Bearings are laminated rubber isolation bearings designed to reduce seismic forces transmitted to bridge structures by utilizing rubber shear deformation and frictional sliding mechanisms.
The product is manufactured in accordance with Chinese national standards and incorporates European seismic isolation design concepts.
It is recommended for bridges located in seismic intensity zones of 7 degrees (0.10g) or lower, including highway bridges and municipal infrastructure projects.
By improving structural flexibility, the bearing effectively disperses horizontal seismic energy and enhances bridge safety during earthquake events.
Design Standards
GB 20688.2-2006 - Elastomeric Bearings Part 2: Seismic Isolation Bearings
JT/T 842-2012 - High Damping Seismic Isolation Rubber Bearings
International standards can be supported upon project requirement.
Product Structure & Classification
1. By Functional Type
Fixed Type (LNR Fixed Bearing)
Horizontal movement is achieved through rubber shear deformation.
Rubber material provides strong horizontal force dispersion capability.
Sliding Type (LNR Sliding Bearing)
Equipped with PTFE sliding plate and stainless steel surface.
Low friction coefficient reduces horizontal resistance during structural movement.
2. By Installation Structure
Sleeve-connected structure between bearing and bridge girder/pier
Top and bottom steel plates connected by anchoring bolts or welding systems
No embedded bottom steel plate required in certain configurations
3. By Shape
Circular Seismic Isolation Bearing
Rectangular Seismic Isolation Bearing
Custom shapes can be manufactured according to engineering design drawings.
Technical Advantages
- Effective seismic energy absorption and dispersion
- Excellent horizontal deformation capacity
- Reduced earthquake impact on bridge superstructure
- Reliable structural stability under cyclic loading
- Suitable for moderate seismic regions
- Long service life with low maintenance cost
The bearing utilizes high-quality laminated rubber materials and reinforced steel plates to ensure consistent mechanical performance.
Basic Technical Specifications
|
Item |
Description |
|
Product Name |
Seismic Isolation Bearing |
|
Structure |
Laminated Rubber + Steel Reinforcement |
|
Function |
Seismic force dispersion |
|
Shape |
Circular / Rectangular |
|
Installation |
Bolt or weld anchoring system |
|
Seismic Suitability |
≤ 0.10g seismic zone (recommended) |
|
Custom Design |
Available |
Applications
- Highway and expressway bridges
- Urban viaducts and flyover structures
- Municipal infrastructure projects
- Bridges located in seismic-prone regions
- New construction and bridge upgrading projects
About Us
Jiangsu Yangzhou Heli Rubber Products Co., Ltd.
Established in 1964, the company specializes in engineered rubber products for bridge isolation, load-bearing, and hydraulic infrastructure applications.
With advanced vulcanization production technology and strict quality inspection systems, the company provides customized seismic isolation solutions for infrastructure projects.
FAQ
Q: What is the main function of seismic isolation bearings?
A: It reduces seismic energy transmission by allowing rubber shear deformation and controlled horizontal movement.
Q: Are customized designs available?
A: Yes. Bearings can be manufactured according to project drawings and structural requirements.
Q: What is the service life?
A: The design service life is typically 20–30 years under normal operating conditions.
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