The D400 Double Triangular Manhole Cover (675×675 mm) is a next-generation access solution engineered to withstand the most demanding infrastructure environments, from high-speed motorways to heavy industrial facilities. Compliant with EN 124-2:2015 standards, its innovative dual-triangular geometry and oversized dimensions deliver unmatched load distribution, durability, and safety for critical applications requiring 40+ ton load capacity (D400/C250 class).

Core Advantages & Technical Specifications:

1. Dual-Triangular Reinforced Structure

   • Interlocking triangular panels enhance rigidity and evenly disperse vertical/horizontal forces, reducing stress concentration by 30% compared to traditional square designs (validated via FEA analysis).

   • Optimized for cyclic dynamic loads (e.g., truck traffic), with a permanent deformation resistance of <0.2% under 200,000 load cycles (tested per EN 124-7).

2. Heavy-Grade Material & Corrosion Defense

   • Manufactured from GGG500/7 ductile iron (500 MPa tensile strength, 7% elongation) for superior crack resistance and fatigue performance.

   • Triple-layer protection: Hot-dip galvanized base + epoxy primer + polyurethane topcoat, ensuring 25+ years of service in coastal or chemically aggressive environments (compliant with ISO 12944-5).

3. Safety & Operational Excellence

   • Deep-tread anti-slip pattern (6 mm depth) exceeds BS 7976-2 Pedestrian Slip Resistance standards, maintaining traction in wet/oily conditions.

   • Tamper-proof hinge system with stainless steel bolts and recessed lifting points, deterring theft while enabling tool-free maintenance access.

4. Precision-Engineered Frame Integration

   • 675×675 mm oversized frame features a machined seating surface for seamless cover alignment, eliminating rocking or noise under traffic vibration.

   • Double-seal gasket system (EPDM + silicone) ensures 100% watertight performance, preventing infiltration in flood-prone or high-water-table zones.

5. Global Certifications & Customization

   • Certified to EN 124-2:2015, ISO 9001:2015, and CE Marking for EU and international project compliance.

   • Optional load upgrades (up to F900 class), RFID tagging for asset management, or custom embossed logos for municipal branding.

Applications:

• Transportation: Highway toll plazas, bridge expansion joints, airport taxiways.

• Industrial: Port container yards, oil refinery access points, mining haul roads.

• Municipal: Stormwater drainage in flood zones, wastewater treatment plants.

Why This Product?

Backed by 30+ years of metallurgical expertise, our D400 cover undergoes rigorous quality audits, including ultrasonic thickness testing and salt spray chamber validation (ASTM B117). We offer project-specific engineering support, BIM/CAD files, and global logistics coordination to ensure on-spec delivery for large-scale infrastructure projects.

Ductile iron manhole cover specifications and parameters