500×1000×50 Ductile Cast Iron Double-Leaf Square Manhole Cover

I. Structural Design

1.Dimensions & Material

• 500×1000mm rectangle fits pipe access pits, meter chambers, and telecom vaults—ideal for horizontally aligned equipment.
• 50mm thickness ensures load-bearing capacity while keeping weight ≈60kg (operable by two workers).
• Material: Ductile Cast Iron (QT500-7) with spheroidal graphite; tensile strength ≥420MPa, elongation ≥7%.
• 30% lighter than gray cast iron with superior corrosion resistance.

2.Double-Leaf Efficiency & Safety

• Hinged split-leaf structure: Opens along the long-axis midpoint; single-leaf operation (≈30kg) allows partial access while securing the other half.
• Concealed anti-theft latches: Spring-loaded locks require specialized tools, defeating pry-bar attacks.

II. Material & Performance

1.High-Strength Ductile Cast Iron (QT500-7)

• Tensile strength ≥500MPa, elongation ≥7%; D400 load rating (40 tons).
• Plastic deformation (not brittle fracture) under overload.
• <0.2mm deformation after 200k cyclic load tests—suited for residential roads and industrial zones.

2.Long-Term Corrosion Resistance

• Epoxy-zinc coating withstands 300-hour salt spray, acid rain, deicers, and H₂S.
• Service life >30 years; stable from50°C to 150°C (no low-T embrittlement/high-T creep).

3.Inherent Safety

• Anti-slip cross ribs (3mm height; friction coefficient 0.85)—30% above national standards.
• Dual anti-fall safety: Mechanical interlock prevents full detachment even when unlocked.

III. Installation & Maintenance

1.Critical Installation

• Anti-shift anchoring: M16 high-strength bolts secure frame corners to concrete foundations.
• Watertight seal: EPDM rubber gasket blocks rainwater ingress.

2.Maintenance Protocol

• Clear hinge grooves biannually (prevents jamming).
• Inspect rubber seals in freezing climates; replace if hardened.

IV. Key Applications

Utility vaults: Double-leaf access for cable joints; electrically insulating.

Residential/industrial roads: D400 rating handles fire trucks and waste vehicles.

Corrosive environments: Wastewater plants, coastal infrastructure.

Conclusion

The 500×1000×50 Ductile Cast Iron cover deliverstriple anti-theft security, leveraging QT500-7’s toughness and anti-settlement design for long-term performance. Its double-leaf system boosts maintenance efficiency, while 50mm reinforced construction and epoxy coating ensure heavy-load durability—making it the optimal solution for municipal grids, residential pipelines, and medium-traffic zones where safety, economy, and smart maintenance converge.