Ductile iron manhole covers are generally divided into round and square, and circular manhole covers are generally used in urban road management.
The use of a round manhole cover is mainly based on the fact that each diameter and length of the round manhole cover passing through it is the same, so if the manhole cover is rolled up by a passing vehicle, it will be slightly wider in diameter than the wellhead below it, no matter how it is rolled up, so that the manhole cover will not fall into the wellhead. If the ductile iron manhole cover is square, then the diagonal of the square is obviously longer than the length of the sides. When the manhole cover is rolled up, it is easy to fall into the well along the diagonal direction of the wellhead, causing hidden dangers. If the well head is rounded or significantly smaller than the cover, the cover square will not fall into the well. This involves maximizing the use and saving of materials. The use of the wellhead depends on the size of the wellhead. If you want to install a square ductile iron manhole cover with an area much larger than the wellhead, the utilization and practical value of the material is naturally inferior to the direct use of the circular manhole cover, which not only saves the material of the manhole cover, but also ensures the safety of the wellhead.
Ductile iron manhole covers in rural areas and cable Wells are generally square, which can better prevent rainwater and other liquids from entering. Manhole cover, single, double, cast iron, ductile iron, composite materials, cement, magnesite and other national standards.
Ductile iron manhole covers are responsible for the safety of pedestrians. Therefore, these standards for manhole covers are also formulated for everyone’s safety, and we should not be sloppy.
No matter where you are, as long as you see a suspected safety risk of the manhole cover, remember to contact the relevant departments in time to investigate and deal with oh, we must pay attention to safety.