Aohong offers premium Round Laminated Elastomeric Bearing Pads, meticulously engineered for structural load transfer and movement accommodation in bridges and civil infrastructure. Designed with alternating layers of high-grade rubber and steel laminates, these pads provide a balance of rigidity and flexibility required for demanding environments. Our offerings include Natural Rubber (NR) and Chloroprene Rubber (CR) variants, with optional PTFE sliding surfaces available for enhanced seismic or thermal displacement performance.
Structure
- Rubber Layers: Composed of multiple sheets of NR or CR elastomer, vulcanized together for uniform deflection and high elasticity.
- Steel Shims: Typically 2–5 galvanized or stainless-steel plates, improving vertical load-bearing capacity and dimensional stability.
- Bonding Process: Industrial-grade adhesive and vulcanization combine rubber and steel layers into a monolithic pad.
- PTFE Option: 2 mm to 3 mm PTFE sheet laminated to the top surface in sliding pad versions, enabling low-friction lateral movement.
- Sealing & Finishes: External rubber covers resist ozone, UV light, and moisture for long-term durability.
Specifications
| Parameter | Values & Ranges |
|---|---|
| Diameters | 150 mm, 225 mm, 300 mm, 450 mm, 750 mm, 1050 mm |
| Thicknesses | 30 mm, 55 mm, 70 mm, 96 mm, 148 mm, 230 mm |
| Vertical Load Capacity | Up to 1,500 kN per pad (depends on dimensions and rubber grade) |
| Steel Shim Layers | 2–5 layers (standard); customized up to 8 layers |
| PTFE Thickness (optional) | 2 mm – 3 mm (smooth movement layer) |
| Operating Temperature | CR: −25 °C to +60 °C; NR: −40 °C to +60 °C |
| Material Hardness | 60 ± 5 Shore A |
| Tensile Strength | ≥ 15.5 MPa (ASTM D412) |
| Elongation at Break | ≥ 300 % (ISO 37) |
Characteristics
Vertical Load Support & Horizontal Flexibility
- Evenly distributes loads to supporting structures via steel-rubber laminate compression.
- Rubber’s shear capacity and flexibility allow for controlled deformation under thermal or seismic movement.
Shock & Vibration Resistance
- Inherent elastomeric damping absorbs shock and reduces stress transmission.
- Excellent for infrastructure exposed to dynamic traffic or environmental vibrations.
Installation Ease
- Round shape enables installation in any orientation—ideal for non-linear bridge configurations.
- Lightweight compared to large rectangular pads; installation with minimal hardware.
Durability & Environmental Resilience
- Resistant to ozone, chemicals, UV, and temperature cycles.
- Service life exceeding 25 years with minimal maintenance required.
Optional PTFE Sliding Capability
- Sliding pads accommodate lateral displacement up to ±20 mm per pad, enhancing bridge expansion and rotation performance.
- Dimpled PTFE surface retains lubricant for smooth motion and superior lifespan.
Applications
- Curved and Skew Bridges: Used at supports where alignment follows non-linear geometry.
- Column Pier and Inclined Bridges: Round pads provide uniform response under multi-directional forces.
- Highways & Rail Bridges: Supports in expansion joints, girders, and precast foundations.
- Seismic Retrofit Projects: Used with high-damping or PTFE-bearing systems to minimize seismic energy transmission.
- Infrastructure with Rotational Movement: Ideal for bridges where beam-end rotation is required due to thermal or structural shifts.