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震动挤压工艺生产的预应力混凝土输水管,插口环裂是引起管子质量缺陷的一个重要因素。表1为我厂1986年和1987年生产的预应力混凝土输水管次废品质量缺陷的分类插口环裂是指在管子进行水压检验时,管子插口止胶合与管体连接或其附近管外壁发生环向裂纹漏水或开始时只出现几个不相连的渗水点,继而水滴流淌相连成线,卸去水压待水分基本蒸发后,在插口内壁相应部位出现一条环形潮湿纹痕,水分完全蒸发后情况。从表中可以看出,插口环裂约占次废品总数的24.6％。近年来,我们对此作了大量的分析和试验,基本解决了插口环裂问题,产品合格率有了很大提高。
The prestressed concrete water delivery pipe produced by the vibratory extrusion process is an important factor that causes pipe quality defects. Table 1 shows the classification of the quality defects of pre-stressed concrete water pipes produced in our factory in 1986 and 1987. The socket ring crack refers to the occurrence of pipe joints that are connected to the pipe body or the outer wall of the pipe near the pipe during the hydraulic pressure test. The annular crack leaks or starts with only a few unconnected seepage points, and then the water droplet flows into a line. After the water pressure is evacuated and the water evaporates, a ring of wet marks appears in the corresponding part of the inner wall of the socket. After the water completely evaporates, Happening. From the table, it can be seen that the socket ring crack accounts for about 24.6% of the total number of secondary waste products. In recent years, we have done a lot of analysis and tests on this, basically solved the problem of socket cracks, and the product qualification rate has been greatly improved.