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:
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Dual-Triangular Reinforced Structure
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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).
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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).
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Heavy-Grade Material & Corrosion Defense
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Manufactured from GGG500/7 ductile iron (500 MPa tensile strength, 7% elongation) for superior crack resistance and fatigue performance.
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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).
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Safety & Operational Excellence
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Deep-tread anti-slip pattern (6 mm depth) exceeds BS 7976-2 Pedestrian Slip Resistance standards, maintaining traction in wet/oily conditions.
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Tamper-proof hinge system with stainless steel bolts and recessed lifting points, deterring theft while enabling tool-free maintenance access.
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Precision-Engineered Frame Integration
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675×675 mm oversized frame features a machined seating surface for seamless cover alignment, eliminating rocking or noise under traffic vibration.
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Double-seal gasket system (EPDM + silicone) ensures 100% watertight performance, preventing infiltration in flood-prone or high-water-table zones.
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Global Certifications & Customization
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Certified to EN 124-2:2015, ISO 9001:2015, and CE Marking for EU and international project compliance.
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Optional load upgrades (up to F900 class), RFID tagging for asset management, or custom embossed logos for municipal branding.
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Applications:
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Transportation: Highway toll plazas, bridge expansion joints, airport taxiways.
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Industrial: Port container yards, oil refinery access points, mining haul roads.
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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.
Family: | Municipal |
Packaging Qty: | 10 |
Product Type: | Access Covers |
Certified Class: | D400 |
Standards: | EN124 |
Surface Finish: | Anti-slip surface |
Clear Opening Length (Hinge Side): | 686 mm |
Clear Opening Width: | 686 mm |
Flange Outer Length: | 830 mm |
Flange Outer Width: | 830 mm |
Frame Height: | 100 mm |
Weight: | 92 kg |
Watertight: | No |
Cover/Grating Shape: | Double Triangular |
Cover/Grating Length: | 690 mm |
Hatch Cover/Grating Qty: | 2 |
Hinged: | No |
Opening Direction: | Vertical |
Frame Style: | Monoblock as Cast |
Frame Shape on Vertical Section: | Flat |
Frame Surface Protection By: | Water-Based Paint |
Nb Anchoring Hole: | 8 |
Diameter Anchoring hole: | 20 mm |
Handling Key: | CLE BA1 BS / 511793 |
Ductile iron manhole cover specifications and parameters
Parameter | Specification/Value |
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Material | Ductile Cast Iron (Grade 500-7) |
Standard Compliance | EN 124, BS 497, ASTM A536, ISO 1083 |
Shape | Round, Square, Oval |
Load Rating | A15, B125, C250, D400, E600, F900 (EN 124 load classes) |
Load Bearing Capacity | 1.5 – 90 tons (depending on the rating) |
Size (Diameter/Length) | 300mm – 1500mm (depending on type and design) |
Thickness of Lid | 20mm – 60mm (depending on the load class) |
Weight | 10 kg to 150 kg (depending on size and class) |
Cover Surface | Smooth, Anti-slip, Textured for grip |
Corrosion Resistance | Excellent, with epoxy coatings or bituminous treatment |
Gasket Type | Rubber, Neoprene, EPDM |
Sealing Mechanism | Bolt-down, Locking system, Hinged |
Drainage Holes | Yes, optional (for water drainage) |
Coating Type | Bitumen coated, Epoxy coating, Hot-dip galvanizing |
Temperature Resistance | -30°C to +150°C (depending on coating type) |
Fire Resistance | Flame-retardant (meets local standards for fire resistance) |
Noise Level | Low noise design for urban areas |
Ventilation | Optional vented covers for gas or sewage systems |
Color | Black, Gray, Custom colors available |
Manufacturing Process | Sand casting, Lost wax casting, Centrifugal casting |
Edge Type | Flat, Raised, Beveled, or Reinforced edges |
Bearing Surface | Cast iron, Epoxy, Stainless Steel (optional) |
Longevity | 50+ years with proper maintenance |
Environmental Compliance | RoHS, REACH, and other regional environmental standards |