YJM15-9,10 Precast Beam Prestressed Anchor Price Bridge Railway Tensioning Anchor Inquire About Our Production

Prestressed tensioning anchors are critical components in prestressed engineering, primarily used to secure and transfer the tensile force of prestressed tendons (such as steel strands, wires, or steel bars), ensuring that prestress is effectively applied to concrete structures. The following is a detailed introduction to prestressed tensioning anchors:

1. Main Types

• Wedge Anchor: Suitable for steel strands, anchored via wedge-shaped clips.
• Button Head Anchor: Used for high-strength steel wires, anchored after upsetting the ends.
• Threaded End Rod Anchor: Used for thick steel bars, tensioned via threaded connections.
• Compression Anchor (P-Type Anchor): Secures the end of steel strands through a compression sleeve, commonly used at fixed ends.

2. Composition Structure

• Anchor Plate: Bears the tensile force of the prestressed tendon and transfers it to the structure.
• Clip/Wedge: Grips the prestressed tendon to prevent slippage.
• Anchor Bearing Plate: Distributes the pressure under the anchor to avoid local crushing of concrete.
• Spiral Reinforcement: Enhances the crack resistance of concrete in the anchorage zone.

3. Working Principle

During tensioning, the jack applies tensile force to the prestressed tendon, and the anchor locks the tendon through mechanical interlock or friction, maintaining prestress after unloading YJM15-9,10 Precast Beam Prestressed Anchor Price Bridge Railway Tensioning Anchor Inquire About Our Production. The anchorage efficiency coefficient must be ≥95% (as required by standards).

4. Application Scenarios

• Post-Tensioned Prestressing: Wedge anchors are commonly used in cast-in-place structures like beams, slabs, and bridges.
• Pre-Tensioned Prestressing: Temporary anchors (e.g., tool anchors) are used during bed production.
• External Prestressing: Used in reinforcement projects, with anchors exposed on the structure surface.

5. Relevant Standards

• China: GB/T 14370 "Anchorage, Grips, and Couplers for Prestressed Tendons"

6. Construction Key Points

• Compatibility: The specifications and strength of anchors and prestressed tendons must strictly match.
• Tensioning Control: Adopt "dual control" (stress + elongation value) to avoid over-tensioning or wire slippage.
• Anti-Corrosion Measures: Anchors and exposed tendons require grouting or application of anti-corrosion grease.

7. Common Issues

• Wire Slippage: Clips not gripping tightly or oily surface on the tendon.
• Cracking Under Anchor: Insufficient size of the bearing plate or inadequate concrete strength.
• Fatigue Failure: Anchors require special design under dynamic loads.