Ductile iron manhole cover is generally divided into round and square, in the city's highways, usually circular, because the circular manhole cover is not easy to tilt, can better protect the pedestrian and vehicle safety. Use the circular, mainly taking into account the circular covers through its center of each diameter length is the same, so if the covers were passing vehicles rolled up, because no matter how rolling, the diameter will be slightly wider than the wellhead, will not fall to the wellhead to manhole cover.
And 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. If the wellhead made into round or significantly less than the cover, will not fall into the well covers square.
Here is the problem of the maximum use and saving of a material. The wellhead is used depends on the size of the wellhead, if to a non square manhole cover installed in the above area is far greater than the wellhead, then the material utilization and practical value of nature is not directly using the circular covers more effective, saving material covers also ensures the safety of the wellhead. While in the countryside and the use of cable wells, generally square, so that it can better prevent the rain and other liquids into the.
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