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井蓋為什么是圓的

井蓋為什么是圓的
第一,窨井設在大路上,每天走路的人來人往,設計時就要注意行人的安全,蓋兒不能掉到窨井里。如果設計成三角形或者正方形的,蓋兒雖然比窨井口大一些,但還是有掉下去的可能。而如果是圓形的,由于圓的直徑相等,所以,蓋兒只要大一點點,就不會掉下去。 第二,由于窨井有時需要人工梳理或架線等,這時候又要求窨井的面積盡可能地大。在這些圖...
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