埋设在地下的自来水管道,在长期运行过程中,由于腐蚀、外力的影响、气温的变化以及地震等原因,经常造成孔洞或缝隙而发生漏水现象,因此自来水管道每年因维修堵漏所耗费用之大,确是一笔可观的数字。管道漏水,不但造成管材、管件、人工的直接费用.而且漏水维修时需要大面积长时间停水,给工业和居民用水带来很大不便,有时甚至使工厂停产,这些间 The water pipes buried in the ground often cause leakage due to corrosion, external forces, changes in temperature, and earthquakes during long-term operation. Therefore, the annual cost of water pipes due to maintenance and plugging Big is indeed a considerable number. The leakage of pipelines not only results in direct costs for pipes, fittings, and labor, but also requires a large area of ​​water for a long time to stop water leakage, causing great inconvenience to industrial and residential water use, and sometimes even disabling the production of these plants.