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一、概述石棉水泥管按其使用要求,大致可分为两大类,即压力管和无压管。压力管多用于输送有压力的介质,而无压管多用于下水管道(如房建的排污管道和雨落水管道)、烟道、通风管道,以及通讯和照明的电缆管道等。1956年我国开始试制和使用石棉水泥管。目前,压力管已制订国家标准有《石棉水泥输水管》、《石棉水泥输煤气管》和《石棉水泥输盐卤管》。抄取法生产的石棉水泥无压管成功地用作房建的雨落水管道虽有较长的时间,但作为雨落管和排污管尚未制订国家标准,管子质量没有保证,加之安装不当,破管现象严重,影响推广使用。1979年以来,我所在成都石棉水泥管厂配合下,对用于房建中的石棉水泥管存在的问题进行了研究,并采取了相应措施,将原有的“三轴式”人
I. Overview Asbestos-cement pipes can be roughly divided into two categories according to their requirements, namely pressure pipes and pressureless pipes. Pressure pipes are mostly used to transport pressured media, while non-pressure pipes are mostly used in sewer pipes (such as house-built sewage pipes and rainwater pipes), flue pipes, ventilation pipes, and communication and lighting cable pipes. In 1956, China began trial production and use of asbestos cement pipes. At present, the national standards for pressure pipes have been formulated as “asbestos cement water pipe”, “asbestos cement gas pipe” and “asbestos cement salt pipe”. The asbestos-cement no-pressure pipes produced by copying method have been successfully used as rainwater falling pipes for housing construction. Although there is a long time, as a rain drop pipe and sewage pipe, no national standard has been formulated, the pipe quality is not guaranteed, and the pipe is not properly installed and broken. The phenomenon is serious, affecting the promotion of use. Since 1979, under the cooperation of Chengdu Asbestos Cement Pipe Factory, I have studied the existing problems of asbestos-cement pipes used in building construction and adopted corresponding measures to integrate the existing “three-axis” people.