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许多工业企业的给水系统在使用过程中非常不希望中断供水,甚至不能容忍断水。但是在实际运行中,又常常出现管道裂缝等问题,影响正常供水。此时可采用外接、降压的方法修复管道。在事故地点沿远离承口的水平管段,挖出长3～4米的沟槽(图1),在那里进行准备工作:在裂口底下挖出集水坑,用以收集漏出的水,同时装置一隔板以挡住该段喷水,集水坑中的水用排水泵抽出。当知道管子损坏的特点后(管子上裂口的长短、管外径等),在进行土方工程的同时,即可由熟练工人制成两个端部带承口的半圆形钢套管1和2(图2)。半圆形钢套管内径比损坏的管子外径大25～35毫米,承口是由半圆形钢
Many industrial enterprises in the use of water supply system is very unwilling to interrupt the water supply, water can not even tolerate. However, in actual operation, there are often problems such as pipeline cracks, affecting the normal water supply. At this point can be used external, step-down method to repair the pipeline. At the site of the accident, a trench of 3 to 4 meters long (Figure 1) was dug along a horizontal pipe section away from the socket, where preparation was made: a sump was dug under the cleft to collect the leaking water while the device A partition to block the section of water, sump water drainage pump out. Knowing the nature of the damage to the pipe (the length of the rift in the pipe, the outside diameter of the pipe, etc.), the semi-circular steel bushings 1 and 2 (figure 2). Semi-circular steel casing diameter than the damaged tube diameter 25 to 35 mm, the socket is made of semi-circular steel