In general, ductile iron manhole cover is divided into round and square, and in the urban areas of the highways, usually circular, one of the most important factors is the circular covers not easy to tilt, can better protect the pedestrian and vehicle safety. But if the square, because the square diagonal is significantly longer than the length of each, such covers were rolled up, along the diagonal direction of the wellhead is easy to fall into the well, causing potential safety problems.
From the use of the experience of the circular, ductile iron manhole cover is more commonly used because it has a higher security. The circle is a regardless of how to measure the diameter of equal shape, so the circular covers no matter how is the vehicle rolling, because of its wide diameter than the wellhead, will not fall. This is the reason most used round manhole cover.
In the process of actual application according to different characteristics, reasonable distribution of the use of ductile iron manhole cover. In the vehicle more humanoid municipal construction, we use circular ductile covers, both beautiful and practical. In the application of cable wells, mostly used ductile square manhole cover, can effectively prevent rainwater from entering.
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