Prestressed Concrete Metal Corrugated Duct Manufacturer φ55/60 Prestressed Corrugated Duct Price

Prestressed Corrugated Duct is a key material widely used in post-tensioned prestressed engineering, primarily for forming ducts for prestressing tendons (strands or steel bars) and providing anti-corrosion protection. The following is a detailed description of prestressed corrugated ducts:

1. Types and Materials

• Metal Corrugated Duct
  • Galvanized Steel Strip Corrugated Duct: Most common, zinc coating for rust prevention, cost-effective (Standard: GB/T 19687).
  • Stainless Steel Corrugated Duct: Enhanced corrosion resistance, suitable for highly corrosive environments (e.g., marine engineering).
• Plastic Corrugated Duct (HDPE/PVC): Lightweight, good insulation, Prestressed Concrete Metal Corrugated Duct Manufacturer φ55/60 Prestressed Corrugated Duct Price but lower compressive strength (Standard: JG/T 225).

2. Core Performance Requirements

• Mechanical Performance: Must meet compressive and bending requirements (e.g., radial stiffness ≥0.15kN/m2).
• Sealing Performance: Prevents concrete grout from seeping into the duct.
• Corrosion Resistance: Zinc coating thickness typically ≥40μm Prestressed Concrete Metal Corrugated Duct Manufacturer φ55/60 Prestressed Corrugated Duct Price (salt spray test ≥500h).
• Flexibility: Can bend to adapt to complex reinforcement layouts (minimum bending radius about 3 times the duct diameter).

3. Key Construction Techniques

• Installation:
  • Position according to design coordinates, fix at intervals ≤1m to avoid displacement during pouring.
  • Use specialized sleeves + sealing tape at connections.
• Grouting:
  • Later, inject cement grout (water-cement ratio ≤0.45) to ensure bonding between prestressing tendons and the structure.
  • Vacuum-assisted grouting technology is required for plastic corrugated ducts.