This D400 multileaf manhole cover and frame features a 1200 × 750 mm clear opening divided into three interlocking leaves, each under 25 kg, to facilitate safe, ergonomic lifting—even under heavy wheel loads up to 400 kN (40 tonne test load). Precision machining of mating faces and a three‑point suspension system guarantee fully flush, non‑rock seating, while a slip‑resistant top pattern enhances pedestrian safety. Cast from GGG500/7‑grade ductile iron (ISO 1083) and coated in 30 µm bitumen (with optional epoxy finish), it combines exceptional load capacity, corrosion resistance, and ease of service in high‑traffic environments such as carriageways, industrial sites, and airport aprons.
Product Overview
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Modular Multileaf Design
Breaking the large opening into three leaves reduces individual lift weights and accelerates installation and maintenance without compromising structural integrity. -
Ductile‑Iron Construction
GGG500/7‑grade iron provides a minimum tensile strength of 500 MPa and proof stress of 320 MPa, ensuring durability under repeated loads. -
Precision Seating & Suspension
Three‑point suspension and machined seating surfaces deliver a rock‑free, flush finish that eliminates rattling noise and trip hazards.
Technical Specifications
| Specification | Details |
|---|---|
| Clear Opening | 1200 × 750 mm |
| Leaf Count | 3 interlocking sections |
| Leaf Weight | < 25 kg each |
| Load Class | D400 (400 kN / 40 t) |
| Frame Size | ~1340 × 890 × 100 mm (L×W×Depth) |
| Material Standard | ISO 1083 GGG500/7 nodular iron |
| Coating | 30 µm bitumen (standard); epoxy opt. |
| Top Pattern | High‑USRV/PSRV slip‑resistant grid |
Quality & Compliance
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Standards: Engineered to BS EN 124‑2:2015 Group 4 (D400) requirements for high‑load vehicular covers.
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Certification: Manufactured under ISO 9001 quality systems with third‑party audits for batch traceability.
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Durability: Ductile‑iron alloy and protective coatings minimize lifecycle costs through extended service intervals.
Applications & Benefits
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Heavy‑Traffic Zones: Ideal for highways, industrial estates, and airport aprons subject to wheel loads up to 40 t.
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Enhanced Safety: Slip‑resistant grid surface and flush seating eliminate trip hazards and cover noise.
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Serviceability: Ergonomic, light‑weight leaves and three‑point suspension cut maintenance time and labor.
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Longevity: Corrosion‑resistant finish and high‑strength alloy resist environmental and mechanical wear.
| Family: | Telecom / Fibre / Cable |
| Packaging Qty: | 5 |
| Product Type: | Telecom Access Cover |
| Product Ranges: | DT Range |
| Certified Class: | D400 |
| Surface Finish: | Anti-slip surface |
| Clear Opening Length (Hinge Side): | 1200 mm |
| Clear Opening Width: | 750 mm |
| Flange Outer Length: | 1362 mm |
| Flange Outer Width: | 986 mm |
| Frame Height: | 120 mm |
| Weight: | 208 kg |
| Watertight: | No |
| Cover/Grating Shape: | Double Triangular |
| Cover/Grating Length: | 603 mm |
| Hatch Cover/Grating Qty: | 4 |
| Cover Security Block Angle: | 90 |
| Hinged: | Yes |
| Hinge Type: | FT |
| Opening Direction: | Vertical |
| Frame Style: | Monoblock by Welding |
| 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 |
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 |
