How to ensure the high quality of ductile iron manhole covers
Release date:
Dec 01,2021
Source:
Before installation, the foundation for the cast-iron manhole cover must be neat and sturdy, and the inner diameter, length, and width should be determined according to the dimensions of the cover itself. When installing composite or cast-iron manhole covers on cement surfaces, ensure that the masonry around the well opening is properly reinforced with concrete pouring, and don’t forget to build a surrounding concrete protective ring. Allow the structure to cure for about 10 days afterward. If installing cast-iron manhole covers on asphalt surfaces, take care to avoid direct rolling by construction machinery—both the cover and its base—to prevent damage. Additionally, to maintain the cover’s aesthetic appeal and ensure the clarity of any lettering or patterns, be mindful not to let asphalt or cement spill onto the cover during paving operations.
How to Ensure High-Quality Ductile Iron Manhole Covers:
1. The dimensional specifications of the manhole cover-to-stand assembly structure must comply with the requirements of GB6414. The tolerance grade should not be lower than CT10 as specified in GB6414-1999, ensuring interchangeability between the cast iron manhole cover and its stand.
2. The load-bearing capacity of the cast iron manhole cover is no less than 180 kN, with a failure load capacity of at least 250 kN. Residual deformation is permitted up to (1500)D. The load-bearing capacity of the cast iron manhole cover is also specified as no less than 90 kN, with a failure load capacity of at least 130 kN. In this case, residual deformation is allowed up to (1500)D.
3. Material Requirements: The cast iron manhole covers are primarily made from ductile iron material.
Things to consider when installing ductile iron manhole covers:
Before installation, the foundation for the cast-iron manhole cover must be neat and sturdy, and the inner diameter, length, and width should be determined according to the dimensions of the cover itself. When installing composite or cast-iron manhole covers on cement surfaces, ensure that the masonry around the well opening is properly reinforced with concrete pouring, and don’t forget to build a surrounding concrete protective ring. Allow the structure to cure for about 10 days afterward. If installing cast-iron manhole covers on asphalt surfaces, take care to avoid direct碾压 (rolling) by construction machinery—both the cover and its base—to prevent damage. Additionally, to maintain the cover’s aesthetic appeal and ensure the clarity of any lettering or patterns, be mindful not to let asphalt or cement spill onto the cover during paving operations.
Guarantee, no less than, capability, ductile iron
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