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塑料三管(上、下水管和雨水管)的应用研究随着住房建设的发展而逐步开展。在上海地区,最早研究应用的是硬聚氯乙烯雨水管。七十年代,由于石油危机,国外纷纷研制钙塑材料,并取得了相当的成绩。上海钙塑建材厂吸取了国外有益的经验,结合本国特点,研制成功聚乙烯钙塑落水管,在新建住宅与房屋维修中大量推广,目前已取代石棉水泥管。该厂近年来更进一步研制塑料上、下水管,开始在试点工程中应用。
The application of three plastic pipes (upper and lower water pipes and rainwater pipes) has been gradually carried out with the development of housing construction. In Shanghai, the earliest research and application was the hard PVC rainwater pipe. In the 1970s, due to the oil crisis, overseas developed calcium plastic materials and achieved considerable results. Shanghai Ca-plastic Building Materials Factory has learned useful experience from abroad, combined with its own characteristics, successfully developed polyethylene-plastic-plastic falling-water pipes. It has been widely promoted in the construction of new houses and houses, and has now replaced asbestos-cement pipes. In recent years, the plant has further developed plastic upper and lower water pipes and began to use them in pilot projects.