Advantages of ductile iron manhole cover

Ductile iron manhole covers are generally divided into garden open thin and square, in the urban road administration, generally use the garden shape, because the round manhole cover is not easy to tilt, can mosquito good protection of pedestrians and vehicles. The use of circular, mainly considering that the circular manhole cover through its center of each diameter length is the same, so that if the manhole cover is passed by the vehicle wheel, because no matter how to roll up, its diameter will be slightly wider than the following parallel mouth, and the cover will not fall into the wellhead, and if the square, because the diagonal line of the square is significantly longer than the length of each side, such a manhole cover is rolled up, It is easy to fall into the well along the diagonal direction of the well head, causing hidden dangers. If the well head is rounded or significantly smaller than the cap, the square cap will not fall into the well. Here there is a question of the utilization and conservation of materials. The use of parallel mouth depends on the size of the wellhead, if you have to install a square area far larger than the wellhead and cover, then the use of materials and practical value of nature does not directly use the circular manhole cover more effective, not only save the material of the manhole cover, but also ensure the safety of the wellhead!