从1960年到现在,我们施工了数十公里供水压力管道。管道为φ200～900铸铁管,全系石棉水泥接口.前几年,由于缺乏经验,对质量不够重视,管理不善,因此工程质量问题较多。1960年施工的管道,约有40%是经过2～3次返修才试压合格的,某些φ900管道甚至经过4～5次返修。管道铺设后试压不 From 1960 to the present, we have constructed dozens of kilometers of water pressure pipes. The pipeline is φ200～900 cast iron pipe, and the whole series of asbestos cement interface. In previous years, due to lack of experience, insufficient attention was paid to quality, and management was poor, so the engineering quality problems were more. About 40% of the pipelines constructed in 1960 were qualified for pressure testing after 2 or 3 reworks. Some φ900 pipelines were even repaired 4 to 5 times. Pressure test after pipe laying is not