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1、三角形或正方形的边由直的线段组成，构成的角较尖，如果在修理时碰到很容易使人受伤。而圆形的边是一条圆弧，就不会出现这个问题。
2、由于窨井有时需要人工梳理或架线等，这时候又要求窨井的面积尽可能地大。在这些图形中，当它们的周长相等时，圆形的面积最大。同时圆形又符合我们的体型，便于工作人员进进出出。
3、窨井设在大路上，每天走路的人来人往，设计时就要注意行人的安全，盖儿不能掉到窨井里。如果设计成三角形或者正方形的，盖儿虽然比窨井口大一些，但还是有掉下去的可能。而如果是圆形的，由于圆的直径相等，所以，盖儿只要大一点点，就不会掉下去。
3, triangular or square edge composed of straight line segments, consisting of the angle is sharp, if the repair encountered very easily injured. Round edge is a circular arc, would not have this problem.
2, because the manhole sometimes need artificial sort or stringing, then asked the manhole area as large as possible. In the figures, when they have equal perimeters, circular area of the largest. At the same time circular also accord with our body, and is convenient for the staff in and out.
1, the manhole is located in the road, walk every day People are hurrying to and fro., design should pay attention to the safety of pedestrians, not fell into the manhole lid in. If the design of a triangle or square, lid while some larger than the manhole, but still it's possible. And if it is circular, the diameter of the circle are equal, so the lid as long as big a little bit, will not fall. |