This Sanmenxia ductile iron manhole cover project is a municipal manhole cover, a round ductile iron anti-subsidence manhole cover. Ductile iron manhole covers offer significant advantages over conventional cast iron covers. They possess superior mechanical properties, high plasticity and durability, and are even stronger than carbon steel, with overall performance comparable to that of steel.
Other advantages of ductile iron anti-subsidence manhole covers include:
1. Anti-theft and anti-displacement: Ductile iron manhole covers feature an anti-theft box, and the manhole ring is secured with anchor bolts.
2. Anti-fall: Ductile iron manhole covers feature an internal anti-fall grille.
3. Anti-subsidence: Anti-subsidence manhole covers distribute loads across the pavement structure, protecting the surrounding road surface and preventing subsidence.
4. Noise reduction: The cover frame is integrated with the pavement, minimizing noise.
5. Anti-slip: The ductile iron manhole cover features a star-shaped pattern for a slip-resistant design.
Weight of Ductile Iron Manhole Covers
The weight of ductile iron manhole covers varies between the north and the south. Due to the weather in the north, ductile iron manhole covers are heavier than those in the south. Sanmenxia City is located in the north, and the ductile iron manhole covers used by customers in Sanmenxia are round, typically weighing 75-95 kg. Manhole covers in the south, for example, typically weigh 60-90 kg.
What are the load-bearing models of ductile iron manhole covers?
Common specifications include heavy-duty 400 kN, standard 250 kN, and light-duty 125 kN. The average bending strength is 220 MPa, the average impact strength is 10 jin per square meter, the average compressive strength is 25 MPa, and the tensile strength is 10 MPa.
What are the common specifications and models of municipal ductile iron manhole covers?
Generally, round ductile iron manhole covers come in sizes of 60, 70, and 80 cm. Square ductile iron manhole covers come in sizes of 75 x 45, 60 x 60, and 40 x 60 cm. Round covers with a radius of 60 cm are commonly seen. They can cover road surfaces or deep wells, preventing people or objects from falling, and can also be used to drain accumulated water.
