PTFE bridge bearing pads are installed on supporting pads using two primary methods: direct bonding with epoxy mortar or embedding within a steel plate groove. The direct method ensures a seamless, gap-free connection, while the steel plate method provides structural reinforcement and alignment precision. Both approaches leverage PTFE's low friction and durability to accommodate bridge movements and loads effectively. Proper installation is critical to prevent deviations under compression and ensure long-term performance.
Key Points Explained:
1. Direct Bonding Method
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Process:
- PTFE ptfe sliding pads are placed directly on the supporting pad.
- Leveling is performed to ensure even contact.
- Epoxy mortar bonds the PTFE to the pad, eliminating gaps.
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Critical Checks:
- Verify no air pockets or misalignment post-installation.
- Compression testing ensures no deviations under load.
2. Embedded Steel Plate Method
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Components:
- A steel plate (connected to the cushion stone’s steel mesh) is embedded atop the supporting pad.
- A 5mm-deep groove, 5mm larger than the bearing pad, is machined into the plate.
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Installation:
- The PTFE pad fits snugly into the groove, preventing lateral displacement.
- Enhances load distribution and alignment accuracy.
3. Material Advantages of PTFE
- Low Friction: Enables smooth sliding under high loads.
- Chemical/Environmental Resistance: Reduces degradation risks in harsh conditions.
- Durability: Withstands repeated stress cycles without wear.
4. Design Considerations
- Load & Area Calculation: Determines pad thickness and size.
- Temperature Limits: PTFE’s thermal expansion must align with bridge design.
- Mounting Selection: Choose between direct bonding or steel plate based on structural needs.
5. Quality Assurance Steps
- Inspection: Post-installation checks for defects (e.g., uneven bonding, groove misalignment).
- Testing: Simulate load conditions to validate performance.
6. Practical Implications for Purchasers
- Method Selection: Direct bonding suits simpler designs; steel plates offer higher precision for complex spans.
- Supplier Coordination: Ensure PTFE pads and steel plates meet dimensional tolerances.
By understanding these methods and PTFE’s properties, engineers can optimize bearing pad installations for safety and longevity in bridge projects.
Summary Table:
| Installation Method | Key Steps | Critical Checks |
|---|---|---|
| Direct Bonding | - Place PTFE pad on supporting pad - Level for even contact - Bond with epoxy mortar |
- Check for air pockets/misalignment - Conduct compression testing |
| Embedded Steel Plate | - Machine groove in steel plate - Fit PTFE pad snugly into groove |
- Verify groove dimensions - Ensure load distribution accuracy |
| Material Advantages | - Low friction for smooth sliding - Chemical/environmental resistance - High durability under stress |
- Align thermal expansion with design - Validate load capacity |
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