Precautions for installing Ductile iron manhole square covers

Precautions for installing Ductile iron manhole square covers

When installing Ductile iron manhole square covers, the following precautions should be followed to ensure the normal use and safety of the manhole covers:

Check manhole cover size: Before installation, confirm whether the size, shape and inner diameter of the manhole cover meet the design drawings and actual site needs.

Check foundation flatness: Before installation, ensure that the manhole cover foundation is flat and solid, and the wellhead size matches the manhole cover.

Install concrete cushion: When installing on a cement pavement, use C25 concrete to pour a concrete cushion at least 20 centimeters thick, and ensure that the periphery of the cushion is flat and there is no loosening.

Avoid direct rolling: When installing on an asphalt pavement, construction machinery should be avoided from directly rolling on the manhole seat to prevent damage. When pouring the pavement as a whole, a hole slightly larger than the manhole seat should be reserved, and the manhole cover should be placed after the asphalt is laid.

Check the integrity of the manhole cover: Before installation, conduct a comprehensive inspection of the manhole cover to ensure that there are no defects such as damage and cracks.

Fix the manhole cover: Use appropriate fasteners to fix the manhole cover on the concrete cushion to ensure that the manhole cover will not shift or tilt.

Keep level: Ensure that the surface of the manhole cover is at the same height as the surrounding ground and adjust if necessary.

Reserve expansion joints: When using a manhole cover without a frame, reserve expansion joints for the product.

Check the fixation of the manhole frame: Concrete should be poured at the bottom and around the manhole frame to ensure firm fixation and prevent sinking or shifting.

Curing period: After installation on a cement pavement, there should be a curing period of at least 10 days to ensure that the concrete is completely cured.

Protect the surface of the manhole cover: During asphalt or cement pavement construction, measures should be taken to protect the surface of the manhole cover to avoid pollution or damage.

Inspection after installation: After installation is completed, the manhole cover should be inspected to ensure that it is stable, level and opens smoothly.

Please operate according to the above precautions to ensure the installation quality and service life of Ductile iron manhole square covers. In actual work, local installation specifications and standards should also be complied with.