Natural Chloroprene Bridge Laminated Elastomeric Bearing Pier Seismic Load Pad

You are here: Home » Products » Bearings And Seismic Isolation Devices » Rubber Bearing » Natural Chloroprene Bridge Laminated Elastomeric Bearing Pier Seismic Load Pad

Natural Chloroprene Bridge Laminated Elastomeric Bearing Pier Seismic Load Pad

Natural Chloroprene Bridge Laminated Elastomeric Bearing Pier Seismic Load Pad

The bridge rubber bearing is a core load-bearing and seismic-mitigation component installed between the bridge superstructure and piers. It is manufactured by alternately layering natural rubber or chloroprene rubber sheets with reinforcing steel plates and vulcanizing them under high temperature, forming a laminated elastomeric rubber bearing structure. Vertical loads are carried jointly by the steel plates and rubber, while horizontal displacement is accommodated through shear deformation of the rubber layers. This type of bridge bearing is widely adopted in small to medium span bridges.
Unlike single-material pads, this elastomeric rubber bearing pad separates vertical stiffness from horizontal flexibility: the steel layers restrain the lateral bulging of rubber to achieve high load capacity, while the rubber layers provide the low-stiffness displacement space needed for beam expansion and contraction. When beam ends move due to traffic, temperature changes or seismic events, the bridge seismic bearing effectively absorbs displacement and vibration energy, protecting the pier structure.
Planar dimensions, total rubber thickness, number of steel layers, and rubber material can all be customized to meet specific project requirements.

Quantity:
Availability:





Inquire

Model:
Customized
Brand:
MingHeng

Technical Advantages

Layered Load-Bearing Design: The composite construction of multiple steel plates and rubber allows independent optimization of vertical load capacity and horizontal displacement capability, overcoming the performance limitations of single-material bearings.
Flexible Displacement Accommodation: With the low shear modulus of rubber, laminated elastomeric rubber bearings can achieve large beam displacements while generating relatively low horizontal reaction forces, reducing the load on piers.
Progressive Failure Protection: Even if localized damage occurs in the rubber layer under extreme conditions, the internal steel plates continue to provide structural support, creating a buffer period for inspection and repair. This is an important safety feature of bridge seismic bearings.
Environmental Durability: The outer rubber layer fully encapsulates the steel plates, isolating them from moisture and salt spray. Chloroprene rubber bridge rubber bearings demonstrate more stable aging resistance in areas with strong UV exposure or coastal salt spray.

Material Options

Bridge rubber bearings can be manufactured with three main rubber materials based on the service environment:

Material	Characteristics	Suitable Environment
Natural Rubber	Excellent elastic recovery, high mechanical strength, goodperformance at low temperatures	Temperate climates, conventionalinland bridges
Chloroprene Rubber	Weather, ozone, and oil resistance; outstanding aging resistance	Coastal areas, industrial atmospheres,high UV regions
EPDM Rubber	Outstanding aging resistance, broadtemperature tolerance, steamresistance	Coastal areas, industrial atmospheres,high UV regions

Natural rubber provides superior rebound and load bearing performance under normal conditions. Chloroprene rubber offers extended service life in humid, salt laden, or high sunlight environments. EPDM rubber exhibits slower performance degradation under extreme temperature fluctuations and prolonged outdoor exposure, making it suitable for projects with demanding durability requirements.

Product Parameters & Configuration Options

Item	Parameter Range
Hardness (IRHD)	60±5
Tensile Strength (MPa)	≥17
Elongation at Break (%)	≥400
Ultimate Compressive Strength R (MPa)	≥70
Compressive Elastic Modulus E (MPa)	E±E×20%
Shear Elastic Modulus G (MPa)	G±G×15%
Surface Type	Plain friction surface for normal displacement needs; PTFE sliding surface to reduce sliding resistance for large displacement bridge seismic bearings.
Shape	Rectangular or circular, customizable to match pier configurations.

Application Scenarios

Bridge rubber bearings are used across highway bridges, railway bridges, urban viaducts, interchange ramp bridges, and pedestrian bridges, primarily at beam end support locations of simply supported and continuous girder structures. In various small to medium span bridges, bridge rubber bearings handle superstructure load transfer and displacement accommodation while meeting conventional seismic protection requirements.

Installation Process Overview

Pad stone inspection: ensure surface flatness and design-specified elevation.
Position the bridge rubber bearing: align centerline with design position.
Beam placement: lower the beam gradually to avoid impact on the laminated elastomeric rubber bearing.
Status check: confirm the bridge bearing has no void, eccentric compression, or over-displacement.