地下埋设的自来水铸铁管道,由于腐蚀,温度变化和外力等因素,经常会产生破裂漏水的现象。过去修复自来水管漏水的办法,一般是用金属制成的“卡子揣袖”(铸铁或熟铁的)将管身的破裂部位卡住,两端打上灰口或铅口。当承口部位破裂时,则用“大头卡筛”将承口卡住。如果破裂部位较长,储备的“卡子”规格不全,则必须将破裂水管割断起出,更换一段新管。这些方法不仅操作繁重,劳动强度大,还须储备多种多样的备件,而更重要的是由于修复时间较长,因而延长关闭闸门停水的时间,严重影 Underground water pipes buried in cast iron often cause cracking and leakage due to corrosion, temperature changes, and external forces. In the past, the method of repairing water leakage from tap water pipes was generally made of metal and “clamp sleeves” (cast iron or wrought iron) stuck in the broken part of the pipe body, and both ends were marked with gray or lead. When the socket part is broken, the socket is jammed with a “big head card screen.” If the rupture site is long and the specifications of the clips are not complete, the ruptured water pipe must be cut off and replaced with a new one. These methods not only require heavy operations and labor intensity, but also have to store a wide variety of spare parts. What’s more important is that because the repair time is longer, the time for shutting off the water for shutting the gate is prolonged, and the effect is severe.