Engineered for infrastructure professionals managing heavy vehicle zones, the D400 Multileaf Manhole Cover combines robust load-bearing capacity with intelligent modular design. Its double triangular configuration ensures structural integrity under constant stress, making it ideal for logistics hubs, port access roads, and urban arterial routes.
Breakthrough Features
- Tri-Lock Load Distribution™
Three interlocking triangular leaves disperse pressure across 12 contact points, achieving D400 certification (400kN load capacity) – 22% higher efficiency than traditional rectangular covers. - Zero-Sag Hinge Mechanism
Heavy-duty stainless steel hinges with grease-infused bushings withstand 50,000+ open/close cycles. Self-aligning pins prevent misalignment from vibration or thermal expansion. - MultiGuard Seal System
Interlocking neoprene gaskets + integrated drainage channels block debris ingress while allowing controlled water flow (25L/sec capacity).
Technical Precision
- Clear Opening: 1300mm x 800mm (51.2″x31.5″) – accommodates modern maintenance equipment.
- Frame Height: 100mm (3.9″) low-profile design reduces trip hazards.
- Material: Ductile iron EN-GJS-600-3 with hot-dip galvanized finish.
- Surface Safety: 3mm raised diamond tread pattern (63 BPN slip resistance).
Operational Advantages
- Partial Access Mode: Open individual triangular leaves for confined space entry.
- Theft Deterrent: RFID-compatible locking lugs (optional tracking system).
- Speed Installation: Pre-mounted hinge assemblies cut setup time by 35%.
- Noise Control: Impact-absorbing PU frame liners reduce decibel levels by 18dB.
Critical Applications
- Container terminal access roads.
- Bus rapid transit (BRT) corridors.
- Tunnel ventilation system hatches.
- Smart city utility corridors with IoT integration.
Durability Testing
- 2,000-hour salt spray resistance (ISO 9227).
- -40°C to 80°C operational range (EN 1433).
- 25-year structural warranty.
| Family: | Telecom / Fibre / Cable |
| Packaging Qty: | 5 |
| Product Type: | Telecom Access Cover |
| Certified Class: | D400 |
| Standards: | EN124 |
| Surface Finish: | ANTI-SLIP TI RAISED PATTERN |
| Clear Opening Length (Hinge Side): | 1300 mm |
| Clear Opening Width: | 800 mm |
| Flange Outer Length: | 1500 mm |
| Flange Outer Width: | 980 mm |
| Frame Height: | 100 mm |
| Weight: | 246 kg |
| Watertight: | No |
| Cover/Grating Shape: | Double Triangular |
| Cover/Grating Length: | 666 mm |
| Hatch Cover/Grating Qty: | 4 |
| Cover Security Block Angle: | 90 |
| Hinged: | Yes |
| Hinge Type: | TI |
| Lock Type: | 1/4 Turnbuckle |
| Number of Locking: | 1 |
| Opening Direction: | Vertical |
| Frame Style: | Monoblock as Cast |
| Frame Shape on Vertical Section: | Flat |
| Frame Surface Protection By: | Water-Based Paint |
| Nb Anchoring Hole: | 4 |
| Installation Type: | With Concrete |
| Diameter Anchoring hole: | 20 mm |
| Handling Key: | Hook Handle / 517082 |
| Locking Key: | CLE TI / 514260 |
Ductile iron manhole cover specifications and parameters
| Parameter | Specification/Value |
|---|---|
| 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 |
