Square Round Hole Ductile Iron Manhole Cover Size 700*800mm C250 D400
Ductile iron manhole covers with square frames and round covers have significant advantages, integrating the characteristics of the two and adapting to a variety of scenarios:
1. Structural safety advantages
The round cover prevents falling: The diameter of the round cover is consistent in any direction. When it is rolled up by a vehicle or subjected to external force, it will not fall into the manhole due to shape dislocation (the square diagonal is longer than the side length, and there is a risk of falling into the manhole along the diagonal), protecting the safety of pedestrians and vehicles.
Solid positioning of the square frame: The square frame has a high degree of fit with the manhole and the road surface. It can be accurately aligned with the square manhole during installation. It is firmly fixed by bolts, interlocking, etc., and is not easy to shift or tilt, enhancing overall stability, especially in sections where vehicles frequently roll over.
2. Material performance advantages (relying on ductile iron)
High strength and toughness: Ductile iron has a tensile strength of ≥420MPa and a yield strength of ≥300MPa, and its toughness is more than 10 times that of gray iron. When the manhole cover is crushed or impacted by heavy-loaded vehicles, it is not easy to deform or crack, and it has strong durability. For example, in the D400 load scenario of the main urban road, the structure can be maintained intact even after long-term use.
Corrosion resistance and wear resistance: After treatment (spraying anti-rust paint, etc.), it has excellent corrosion resistance. The corrosion amount of the water spray corrosion test for 90 days is only 1/40 of that of the steel pipe. It can resist erosion in harsh environments such as sewage, acid and alkali; the surface hardness is high and wear-resistant, which reduces the friction loss of vehicles and pedestrians and prolongs the service life.
3. Functional adaptation advantages
Convenient space and operation: The square frame provides a larger space around the wellhead. After the circular cover is opened, it is convenient for maintenance personnel to go down to the well to operate, and it is suitable for cable laying, pipeline maintenance and other operations. Especially in the application of pipeline wells such as communications and electricity, it takes into account both wellhead protection and convenient operation.
Anti-skid and anti-theft design: The circular cover can be provided with anti-skid patterns (diamond, wave pattern, etc.), which can improve the friction in rainy and snowy days and reduce the risk of pedestrians slipping; with anti-theft structure (spring lock, special tool opening), the square frame can assist in reinforcing the anti-theft device, reduce the possibility of theft, and ensure the safety of underground facilities.
4. Aesthetic and economic advantages
Aesthetic coordination: The square frame can be integrated with the surrounding square road facilities (sidewalk bricks, pavement) and architectural style, and the circular cover can be designed with decorative patterns and logos (such as brand, load information), which are both functional and aesthetic, and improve the coordination of urban landscape.
Cost and efficiency: Ductile iron material is cost-effective. Although the initial cost is higher than some materials, it has a long life (up to decades) and less maintenance, which reduces the overall cost in the long run; standardized square frames and circular covers are suitable for prefabricated wellheads, with high installation and replacement efficiency, shortening the construction period and reducing the impact on traffic.
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