Anchorage for prestressed steel strands in highway bridges, clamps for precast beams, 789-hole anchorage.

Manufacturer of Anchors and Clamps for Prestressed Steel Strands in Highway Bridges, Quotation for 15-7, 8, 9 Hole Anchors, Anchor Production Manufacturer

1. Anchor Assembly

• Wedge-Type Anchor:

  1. Slide the anchor ring onto the prestressed tendon.
  2. Insert the wedges, ensuring they match the conical holes of the anchor ring.
  3. Gently tap the wedges to initially secure them.

• Button Head Anchor/Nut Anchor:

  1. Upset the end of the prestressed tendon or machine threads.
  2. Tighten the anchor nut or slide onto the button head anchor plate.

2. Anchor Positioning

• The tension end anchor must be aligned with the corrugated pipe, Manufacturer of Anchors and Clamps for Prestressed Steel Strands in Highway Bridges, Quotation for 15-7, 8, 9 Hole Anchors, Anchor Production Manufacturer to avoid deviation.
• The fixed end anchor should be embedded in concrete, ensuring the anchor plate is tightly fitted to the structure.

3. Prestressed Tendon Tensioning

1. Jack Installation:
   • Align the jack with the anchor to avoid eccentric loading.
   • Install the limiting plate to control wedge retraction.
2. Stage Tensioning:
   • Initial tensioning (10% σcon) → Measure initial elongation value.
   • Load in stages to the design tension force (e.g., 20%, 50%, 100%).
   • Hold for 2-5 minutes (as per specification requirements) to compensate for stress loss.
3. Anchoring:
   • Slowly release pressure; the wedges automatically grip the prestressed tendon Manufacturer of Anchors and Clamps for Prestressed Steel Strands in Highway Bridges, Quotation for 15-7, 8, 9 Hole Anchors, Anchor Production Manufacturer (wedge-type anchor).
   • Or tighten the nut (support-type anchor).

4. Cutting and Sealing

1. Cut the exposed prestressed tendon (leave 30-50mm to avoid damaging the anchor).
2. Fill the exposed part of the anchor with specialized anti-corrosion grease.
3. Pour concrete or epoxy mortar to seal the anchor head (to prevent rust).

Construction Precautions

1. Anchor Compatibility:
   • Anchor and prestressed tendon specifications must strictly match (e.g., strand diameter, strength grade).
2. Tensioning Control:
   • Use the "dual-control method" (stress control + elongation verification Manufacturer of Anchors and Clamps for Prestressed Steel Strands in Highway Bridges, Quotation for 15-7, 8, 9 Hole Anchors, Anchor Production Manufacturer), with error ≤ ±6%.
3. Wedge Installation:
   • Wedges must be clean and free of oil; after installation, there should be no looseness or misalignment.
4. Safety Protection:
   • During tensioning, personnel must not stand behind the jack to prevent tendon breakage and ejection.
5. Environmental Adaptability:
   • In low-temperature environments, preheat the anchor to avoid brittle failure.

Quality Acceptance Standards

1. Anchorage efficiency coefficient ≥95% (GB/T 14370 standard).
2. Tension force error ≤±5% of design value.
3. Anchor appearance: No cracks or deformation; wedges grip evenly.
4. Sealing compactness: No voids or cracking; anti-corrosion treatment is adequate.

Common Problem Handling

Application Fields

• Bridge Engineering (cantilever construction, continuous beams)
• Building Structures (long-span beams, transfer floors)
• Special Structures (nuclear power plants, offshore platforms)
• Geotechnical Engineering (slope anchor cables, ground anchors)