Ductile Cast Iron Square-Frame-Round-Cover Manhole Covers  

Core Advantages of Our Manhole Covers

1. Irregular-Shape Adaptability & Compatibility
   • Square Manhole Solutions: No need for expensive modifications to existing manholes. Our square covers fit directly onto existing square bases, reducing construction costs by over 30%.
   • Custom Scalability: We offer solutions for non-standard sizes, such as 800×800mm frames with Φ600mm covers, making them ideal for specialized areas like subway tunnels and utility corridors.
2. Dual Anti-Displacement Mechanisms
   • Frame Anchoring: Our manhole frames are securely anchored with expansion bolts or welding, preventing lateral shear forces and eliminating the risk of movement or bouncing.
   • Self-Locking Inner Cover: Equipped with a triple-point latch or spring-loaded locks, the inner cover is protected from flipping or theft, improving safety by up to 50%.
3. Optimized Maintenance Efficiency
   • Rapid Access: The design allows for easy access to the inner cover for repairs, without removing the outer frame, reducing downtime by 40%.
   • Modular Replacement: The frame and cover can be independently disassembled for partial repairs, dramatically lowering maintenance costs.
4. Aesthetic-Functional Integration
   • Hidden Drainage Channels: Built-in water guides along the frame’s edge facilitate quick drainage, reducing erosion.
   • Landscape Customization: Manhole frames can be customized with city emblems or stone-like textures to enhance urban aesthetics and blend seamlessly with surrounding landscapes.

Key Applications

1. Historical Districts & Pedestrian Streets: Preserve cultural heritage while meeting modern load demands with square manhole covers.
2. Utility Tunnels & Cable Trenches: Perfect for covering multi-pipeline zones, with inner covers designed for single-line access.
3. Viaducts & Interchanges: Designed to withstand dynamic load deformation and reduce noise and vibration on elevated structures.
4. Landscape Plazas & Parks: Custom designs integrate with park aesthetics, avoiding the visual disruption often caused by standard circular covers.

Load-Bearing Grades for Various Applications

• D400–E600
  • Group 1 (Minimum: A15): Suitable for green belts, sidewalks, and non-motorized zones.
  • Group 2 (Minimum: B125): Ideal for sidewalks, bike lanes, car parks, and underground garages.
  • Group 3 (Minimum: C250): Best for residential areas, alleys, and light vehicle zones.
  • Group 4 (Minimum: D400): Recommended for urban main roads, highways, and expressways.
  • Group 5 (Minimum: E600): Heavy-duty use in freight terminals, docks, and airports.
  • Group 6 (Minimum: F900): Designed for extreme load-bearing, such as airport runways.

Product Specifications

Compliance & Standards

• GB/T 19426-2018: National Standard for Ductile Iron Manhole Covers in Roads and Bridges.
• GB/T 23858-2009: Ductile Iron Castings.
• CJ/T 3012-1993: Reinforced Concrete Drainage Covers.
• CJJ/T 122-2016: Urban Road Drainage Design Code.

Technical Parameters

• Diameter (mm): φ700–φ1000
• Load Capacity (kN): B125–E600
• Material: Ductile iron per GB/T 23858-2009 and GB/T 19426-2018.
• Testing: Stringent testing for appearance, dimensional accuracy, burst strength, bending force, and impact resistance to ensure top quality.

Why Choose Our Manhole Covers?
Our manhole covers combine durability, safety, and aesthetic appeal while being cost-effective and easy to maintain. Perfect for diverse urban settings and heavy-duty applications, they offer the ideal balance of functionality and design.