YJM15-17 Hole Anchorage Direct Sales Tensioning Anchorage YM15-18 Bridge Anchorage for Precast Beams Contact Me for Customization
Contact Info
- Add:河北衡水北方工業(yè)基地園區(qū)東路269號, Zip: 053000
- Contact: 高晴
- Tel:15297607517
- Email:1518498187@qq.com
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YJM15-17 Hole Anchor Manufacturer Tensioning Anchor YM15-18 Bridge Anchor for Precast Beams Contact Me for Customization
Overview of Prestressed Anchors
Prestressed anchors are key components in post-tensioned prestressed concrete structures, used for anchoring prestressed steel strands or reinforcement bars and transferring prestress to the concrete structure. They are widely applied in bridges, buildings, hydraulic engineering, sleepers, and other projects.
Main Classifications
Type | Applicable Materials | Features | Common Models |
|---|---|---|---|
Wedge-Type Anchor | Steel Strands | Reliable anchoring, convenient construction | |
Button Head Anchor | High-Strength Steel Wires | Requires button-head processing, stable anchoring | |
Extrusion Anchor | Steel Strands | Fixed by extrusion sleeves, good fatigue resistance | JYM, P-Type Anchor |
Nut Anchor | Fine-Rolled Threaded Bars | Re-tensionable, easy adjustment | YGM, JLM |
2. Anchor Components and Technical Parameters
(1) Typical Wedge-Type Anchor (Using OVM as an Example)
Component | Material | Function |
|---|---|---|
Anchor Plate | No. 45 Steel or Alloy Steel | Bears prestress, disperses anchoring force |
Wedge | 20CrMnTi | Grips steel strands, prevents slippage |
Anchor Bearing Plate | Q235B Steel | Transfers prestress to concrete |
Spiral Reinforcement | HRB400 Reinforcement Bar | Enhances local bearing capacity |
(2) Technical Parameters
3. Construction Process
(1) Construction Preparation
- Material Inspection
- Check factory certificate, hardness test report (wedge HRC58-62, anchor plate HRC25-30).
- Re-test steel strands for tensile strength and elongation (e.g., 1860MPa grade, elongation ≥3.5%).
- Tool Preparation
- Tensioning equipment (jacks, oil pumps), extrusion machines, cutters, hoists, etc.
(2) Installation Steps
- Embedded Duct Positioning
- Install metal bellows according to design coordinates, deviation ≤5mm, seal joints with tape to prevent grout leakage.
- Strand Threading and Anchor Installation
- After threading steel strands, install anchor bearing plate, spiral reinforcement, anchor plate, and wedges in sequence (wedges must be evenly tightened).
- Tensioning Construction
- Adopt the dual-control method (stress + elongation value):
- Initial stress (10%σcon) → Measure initial elongation → Stepwise tensioning to 103%σcon (hold for 5min) → Anchor.
- Elongation error controlled within ±6%.
- Adopt the dual-control method (stress + elongation value):
(3) Anchor Sealing Treatment
- Cut Excess Steel Strands
- Use a grinder to cut, exposed length ≥30mm (apply epoxy resin for high anti-corrosion requirements).
- Grouting Protection
- Complete duct grouting within 48 hours (water-cement ratio ≤0.35, strength ≥30MPa).
4. Key Control Points
Stage | Common Issues | Solutions |
|---|---|---|
Wedge Tightening | Uneven bite marks cause strand slippage | Use a dedicated hydraulic compactor for even compression |
Tensioning Synchronization | Uneven stress due to asynchronous multi-strand tensioning | Adopt a multi-jack synchronous tensioning system |
Duct Grouting | Bleeding water, voids | Add expansion agent (0.5%~1%), maintain pressure ≥0.5MPa |
| Industry Category | Construction & Building Materials |
|---|---|
| Product Category | |
| Brand: | 衡水長江預應力 |
| Spec: | 17.18孔錨具 |
| Stock: | |
| Origin: | China / Hebei / Hengshuishi |
