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MingHeng
Product Overview
Laminated rubber bearing pads are bridge support components made by alternately layering multiple rubber sheets with reinforcing steel plates and bonding them through vulcanization. Rectangular and circular are two conventional planar shapes, suitable for different pier geometries and installation spaces. PTFE sliding bearing pads feature a polytetrafluoroethylene sliding layer on the upper surface, working with a stainless steel plate on the beam soffit to reduce sliding resistance, suitable for bridge spans with larger displacement demands. The product accommodates horizontal beam movement through shear deformation of the rubber layers and achieves high vertical stiffness through the confining effect of the steel plates, making it a commonly used bearing type for small to medium span bridges.
Types and Configurations
Rectangular Laminated Rubber Bearing Pads
With a rectangular planar shape, they are easy to match with beam soffit surfaces and pad stone dimensions, and are widely used in small to medium span bridges. Length and width can be determined based on beam width and required bearing area.
Circular Laminated Rubber Bearing Pads
With a circular planar shape, they are suitable for circular pier columns or locations with no strong directional requirements. Circular bearing pads provide consistent displacement accommodation in all horizontal directions and do not require additional orientation adjustment during installation.
PTFE Sliding Rubber Bearing Pads
Based on standard laminated rubber bearing pads, a polytetrafluoroethylene sliding surface is added to significantly reduce horizontal reaction forces during beam movement. They are suitable for large displacement continuous girder bridges, long span simply supported girder bridges, and regions with significant temperature variation.
Features
Rectangular and circular planar forms are available to match different pier shapes and installation spaces.
PTFE sliding configuration reduces sliding resistance and helps the beam expand and contract freely under temperature changes.
The composite structure of multiple steel plates and rubber provides stable vertical load capacity.
Horizontal shear deformation accommodates beam end movement and reduces thrust on piers and abutments.
The outer rubber layer fully encapsulates the steel plates, reducing moisture and salt spray erosion of the internal structure.
Products can be processed according to design drawings, with flexible matching of dimensions and sliding plate configuration to project requirements.
Technical Parameters
| Parameter | Neoprene (CR) | Natural Rubber (NR) |
| Hardness (IRHD) | 60±5 | 60±5 |
| Tensile Strength (MPa) | ≥17 | ≥18 |
| Elongation at Break (%) | ≥400 | ≥450 |
| Ultimate Compressive Strength R (MPa) | ≥70 | ≥70 |
| Compressive Elastic Modulus E (MPa) | E±Ex20% | E±Ex20% |
| Shear Elastic Modulus G (MPa) | G±Gx15% | G±Gx15% |
Applications
Small to Medium Span Highway Bridges: Rectangular laminated rubber bearing pads are used for beam end support in simply supported and continuous girder bridges.
Circular Pier Bridges: Circular bearing pads match pier cross sections and are used in urban viaducts and ramp bridges.
Large Displacement Bridges: PTFE sliding bearing pads are used for long span continuous girder bridges and beam ends in regions with significant temperature variation.
Small to Medium Span Railway Bridges: Bearing train dynamic loads while providing stable vertical support and horizontal movement accommodation.
Bearing Replacement on Existing Bridges: Customized according to original design parameters to fit existing pier and beam soffit conditions.
Check the flatness and elevation of the pad stone surface before installation to ensure even load distribution on the bearing pad.
Align the bearing pad centerline with the design position during placement to avoid eccentric loading.
For PTFE sliding bearing pads, ensure the stainless steel surface is clean and the sliding surface is free of debris.
Lower the beam smoothly to avoid impact on the bearing pad.
During routine inspection, observe for abnormal deformation, void, or eccentric compression of the bearing pad.
Store flat in a cool and dry place, away from sunlight, rain, and contact with oils.
Planar Shape: Rectangular or circular, determined by pier geometry and required bearing area.
Surface Configuration: Plain friction surface or PTFE sliding surface, selected according to displacement requirements.
Dimensions: Length, width, diameter, and thickness processed according to design drawings.
Rubber Material: Natural rubber or chloroprene rubber, recommended based on service environment.
Steel Plate Layers: Designed according to vertical load requirements, with adjustable plate thickness and spacing.
Special Requirements: Cold resistant formulations, color markings, or other performance requirements can be discussed.
