PTFE bearing pads are installed on prefabricated beams primarily through epoxy resin bonding or mechanical connections (bolting/welding), depending on the beam's design and embedded components. The process involves surface preparation, precise positioning, and secure attachment while protecting the PTFE from damage. For prefabricated beams without embedded plates, epoxy mortar bonds the pad's upper steel plate directly to the beam. If embedded plates exist, bolting or welding connects the pad to these plates. Proper alignment, controlled bolt tightening, and post-installation checks ensure optimal performance.
Key Points Explained:
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Surface Preparation
- Clean and level the beam's contact surface to ensure proper adhesion or mechanical connection. For epoxy bonding, roughening the surface improves mortar grip.
- Inspect the ptfe bearing pad for defects before installation. Any contamination (dust, oil) must be removed to prevent bonding failures.
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Installation Methods
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Epoxy Resin Mortar Bonding:
- Apply epoxy mortar to the beam's surface or the pad's upper steel plate.
- Press the pad into position, ensuring full contact without gaps. This method suits beams without embedded plates.
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Bolting/Welding:
- For beams with embedded steel plates, align the pad and secure it using bolts (with PTFE discs to prevent over-tightening damage) or tack welding.
- Use a crisscross bolt-tightening sequence to distribute pressure evenly.
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Epoxy Resin Mortar Bonding:
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Alignment and Protection
- Use alignment tools (e.g., shims) to ensure the pad is level and centered. Deviations can cause uneven load distribution.
- Shield the PTFE surface from weld spatter, paint, or debris during installation to maintain its low-friction properties.
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Post-Installation Checks
- Verify no gaps exist under the pad by conducting a compression test.
- For bolted connections, ensure bolts are snug but not over-tightened (metal bushes can limit torque).
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Design-Specific Considerations
- Prefabricated beams with embedded plates may have grooves (5mm deep, 5mm larger than the pad) to enhance positioning accuracy.
- If the pad slides during operation, revisit bolt tightness or bonding integrity.
These steps balance structural integrity with the PTFE's functional requirements, ensuring long-term performance in bridge and beam applications.
Summary Table:
| Step | Key Actions | Purpose |
|---|---|---|
| Surface Preparation | Clean and level the beam's surface; inspect PTFE pad for defects. | Ensures proper adhesion or mechanical connection. |
| Installation Method | Epoxy bonding or bolting/welding, depending on beam design. | Provides secure attachment tailored to beam specifications. |
| Alignment | Use alignment tools (shims) to center and level the pad. | Prevents uneven load distribution. |
| Post-Installation | Conduct compression tests; check bolt tightness or bonding integrity. | Verifies structural integrity and pad functionality. |
Ensure your prefabricated beams are equipped with high-performance PTFE bearing pads for long-term durability and reliability. Contact KINTEK today for custom solutions tailored to your project needs. Our expertise in PTFE components for structural applications ensures precision and quality from prototype to high-volume orders.
