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Ductile Cast Iron Anti-Settlement Manhole Covers  

Product Features:

High Load-Bearing Capacity，Anti-Slip Wear-Resistant Surface, Customizable

The working principle of the impact crusher can be simply described as a stone crushing process based on impact and collision. During operation, stones naturally fall onto the high-speed rotating impeller. The impeller accelerates the stones and throws them out at high speed, causing them to collide with other stones that are falling naturally. This collision forms a vortex, and as the stones return, additional crushing takes place, further reducing the size of the material. As a result, the wear on the crusher's counterattack plate is minimized during operation.

 

The stone material falls directly onto the high-speed rotating turntable at the top of the machine. Under the influence of centrifugal force, it collides with other stones that are distributed around the turntable in an umbrella shape. This high-speed impact results in intense crushing. After the collision, the stones form a vortex motion between the turntable and the casing, leading to multiple additional impacts, friction, and crushing. The material is then discharged from the bottom of the machine. This process creates a closed loop, where the material is continually subjected to impact and screening until it reaches the required particle size. The final particle size is controlled by screening equipment.

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Ductile Iron Anti-Settlement Manhole Covers
Product Description

Ductile Iron Anti-Settlement Manhole Covers: The Ultimate Solution for Heavy-Duty Infrastructure

Overview
Ductile iron anti-settlement manhole covers are high-performance solutions specifically designed to prevent common issues like subsidence and displacement. Made from ductile iron and utilizing advanced manufacturing techniques, these covers provide superior load distribution, ensuring long-term stability and reduced maintenance. Ideal for high-traffic areas, heavy-duty zones, and subsidence-prone regions, these covers enhance road safety, infrastructure longevity, and overall traffic smoothness.

Compared to traditional cast iron covers, ductile iron anti-settlement covers offer up to 80% reduction in road maintenance frequency. Additionally, they outperform composite materials in terms of fatigue resistance and extreme load adaptability. Future integration with smart monitoring systems like settlement sensors promises to further enhance maintenance efficiency and contribute to the development of smart cities.

Key Advantages of Ductile Iron Anti-Settlement Manhole Covers

1. Superior Anti-Settlement Performance

  • Load Distribution: The unique cover-frame design evenly transfers vehicle impact forces, significantly reducing localized pressure. These covers are compatible with load classes E600-F900, ensuring optimal performance for heavy-duty applications.
  • Dynamic Adaptability: Elastic buffer layers absorb vibration energy, reducing subsidence risks even under repeated traffic loads.

2. Exceptional Load-Bearing Capacity

  • Static & Dynamic Loads: Each cover can withstand a static load of ≥400 kN (e.g., F900 grade) and undergo 1 million cycles of dynamic fatigue testing without failure.
  • Impact Resistance: The high toughness of ductile iron prevents fractures under heavy impacts, ensuring durability and avoiding sudden cover collapse.

3. Long-Term Stability

  • Deformation Resistance: The covers maintain their geometric integrity over time, preventing gaps between the cover and frame, even under constant heavy traffic pressure.
  • Low Maintenance: The hot-dip galvanized coating, combined with the ductile iron base, offers corrosion resistance, resulting in a lifespan of over 30 years and 50% lower maintenance costs compared to standard cast iron.

4. Enhanced Safety & Anti-Theft Features

  • Anti-Displacement Locking: Triple-spring locks or bolted designs ensure that covers stay in place, preventing theft and minimizing the risk of movement or bouncing.
  • Noise Reduction: The tight-fitting structure eliminates noise caused by vehicle passage, contributing to a quieter and smoother road experience.

5. Cost Efficiency & Sustainability

  • Lifecycle Cost Advantage: While the initial cost of ductile iron covers may be higher than composite alternatives, their long lifespan and minimal upkeep significantly reduce overall lifecycle costs.
  • Eco-Friendly: With a 95% recycling rate, ductile iron covers support sustainable, green infrastructure development.

Ideal Applications for Ductile Iron Anti-Settlement Manhole Covers

  • High-Traffic Zones: Urban roads, highways, and freight corridors (Recommended: F900 grade).
  • Subsidence-Prone Areas: Soft soil foundations, underground utility-dense areas, newly filled roads.
  • Critical Infrastructure: Bridge connections, tunnel entrances, bus lanes.
  • Industrial & Port Facilities: Container terminals, logistics parks, heavy machinery routes.

Minimum Load-Bearing Grades and Applications

  • D400–E600 load-bearing grades:
    • Group 1 (Minimum: A15): Green belts, sidewalks, non-motorized zones.
    • Group 2 (Minimum: B125): Sidewalks, bike lanes, car parks, underground garages.
    • Group 3 (Minimum: C250): Residential areas, light vehicle zones.
    • Group 4 (Minimum: D400): Urban roads, highways, expressways.
    • Group 5 (Minimum: E600): Freight terminals, docks, airports.
    • Group 6 (Minimum: F900): Airport runways.

Product Specifications & Compliance

Compliance with National Standards:

  • GB/T 19426-2018: Manhole Covers for 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: φ700–φ1000 mm
  • Load Capacity: B125–E600 kN

These ductile iron anti-settlement manhole covers are engineered to provide superior durability, load-bearing capacity, and long-term performance for a wide range of heavy-duty applications. They are the ideal choice for projects requiring high resilience, safety, and cost-effective solutions.

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