Installing a PTFE (polytetrafluoroethylene) bearing pad on cast-in-place beams involves anchoring the pad's steel plate to the beam structure while ensuring proper alignment, load distribution, and durability. The process typically includes welding or embedding the pad's steel plate into the beam, connecting it to reinforcement bars, and securing it with epoxy mortar or mechanical fasteners. Proper surface preparation, alignment checks, and post-installation inspections are critical to prevent misalignment, gaps, or stress concentrations that could compromise the beam's performance. The method may vary slightly depending on whether the pad is bonded directly to the supporting surface or set into a pre-embedded steel plate.
Key Points Explained:
1. Anchoring the PTFE Bearing Pad
- The top steel plate of the ptfe bearing pad is welded or anchored to the cast-in-place beam.
- Reinforcement bars (rebar) are cast on-site and connected to the beam body, ensuring structural integration.
- For added stability, some designs use an embedded steel plate on the supporting pad, which is tied to the steel mesh within the cushion stone.
2. Surface Preparation & Alignment
- The flange surfaces must be clean, flat, and free of debris to ensure proper adhesion or mechanical contact.
- The PTFE pad is positioned precisely to avoid misalignment, which could lead to uneven load distribution.
- Alignment tools (e.g., spirit levels, laser guides) may be used to verify correct placement before final bonding or fastening.
3. Bonding Methods
- Direct Bonding: The PTFE pad is leveled and bonded to the supporting pad using epoxy mortar, ensuring no gaps or deviations under compression.
- Embedded Steel Plate Method: A groove (5mm deep and slightly larger than the pad) is machined into the steel plate to secure the bearing pad, improving load transfer.
4. Final Assembly & Inspection
- Bolts (if used) are tightened in a crisscross pattern to distribute stress evenly.
- A post-installation check ensures no leaks, misalignment, or movement under load.
- Lubrication may be applied to the PTFE surface if required for movement (e.g., in sliding bridge bearings).
5. Considerations for Long-Term Performance
- Proper curing of epoxy mortar or concrete around the pad prevents debonding.
- Corrosion protection for steel components (e.g., galvanizing, paint) extends service life.
- Periodic inspections should verify the pad remains secure and undamaged.
Have you considered whether the bearing pad will experience dynamic loads (e.g., traffic vibrations) or static compression? This influences the choice between direct bonding and embedded plate methods. These installation steps ensure the PTFE pad functions as a durable, low-friction interface, quietly supporting infrastructure for decades.
Summary Table:
| Step | Key Actions | Purpose |
|---|---|---|
| Anchoring | Weld or anchor steel plate to beam; connect to rebar | Ensures structural integration and load transfer |
| Surface Prep | Clean and level flange surfaces; use alignment tools | Prevents misalignment and uneven stress distribution |
| Bonding | Apply epoxy mortar or embed into machined steel plate groove | Secures pad and enhances load-bearing capacity |
| Final Assembly | Tighten bolts evenly; inspect for leaks/misalignment | Guarantees stability under operational loads |
| Long-Term Care | Apply corrosion protection; conduct periodic inspections | Extends service life and maintains performance |
Need a Reliable PTFE Bearing Pad Solution?
KINTEK specializes in high-performance PTFE components for critical infrastructure projects. Our bearing pads are engineered for precision, durability, and seamless integration with cast-in-place beams. Whether you require standard designs or custom fabrication for dynamic or static loads, our team ensures optimal performance.
Contact KINTEK today to discuss your project requirements or request a quote!