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井盖为什?#35789;?#22278;的

井盖为什?#35789;?#22278;的
第一,窨井设在大路上,每天走路的人来人往,设计?#26412;?#35201;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?#27169;?#30422;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?#27169;?#30001;于圆的?#26412;?#30456;等,所以,盖儿只要大一点点,就不会掉下去。 第二,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...
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