D400 EN124 Standard 700x700x100mm Round Ductile Iron Manhole Cover for Heavy Duty Urban Roads

This heavy-duty 700×700×100mm round ductile iron manhole cover is engineered for demanding urban road applications. Certified to European Standard EN124 with D400 pressure rating, it delivers exceptional durability and load-bearing capacity for municipal and industrial infrastructure.

• Materials Required: D400 round cast iron manhole cover, manhole ring, C25+ grade concrete, reinforcement bars, level, vibrator, cutter, wrench
• Site Survey: Verify well opening dimensions, clear debris, check wellbore flatness and verticality
• Foundation Preparation: For soft foundations, use graded gravel with medium coarse sand (compaction density ≥95%)

• Frame Positioning: Align frame edges with well opening, maintain level within ≤2mm tolerance
• Concrete Pouring: C25 concrete with minimum width of 300mm and thickness of 150mm around frame
• Anchor Bars: Use U-shaped or L-shaped threaded bars (diameter ≥12mm) in frame reserved holes
• Elevation Control: Implement cross-method measurement for precise road surface alignment

• Placement Timing: Install after concrete curing (minimum 7 days)
• Fit Requirements: Ensure proper fit without gaps between cover and frame
• Security Measures: Tighten bolts or install special locks to prevent movement and theft

• Water-Tight Testing: For rainwater/sewage wells, test at upstream pipe top + 2m head (seepage ≤0.0046×D)
• Pavement Restoration: Match surrounding surface (asphalt or concrete) for smooth transition
• Final Verification: Confirm no looseness, abnormal sounds, and proper load-bearing capacity