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一、前言硬聚氯乙烯(PVC—U)排水管具有重量轻、价格低、阻力小、排水量大、表面光滑美观、耐腐蚀、不易堵塞、安装方便等优点。北美、欧洲、日本、澳洲等发达国家在室内排水管道及房屋雨水排水管道中已大量采用,取代传统的铸铁排水管道。随着我国经济建设的发展和人民生活水平的提高,需要兴建大量的居住建筑和公共建筑,室内排水管道的用量也急剧增加,为节约金属管材及减少能源消耗,1982年
I. Introduction PVC-U drainage pipe has the advantages of light weight, low price, small resistance, large displacement, smooth and beautiful surface, corrosion resistance, easy clogging, easy installation and so on. Developed countries such as North America, Europe, Japan and Australia have adopted a large number of indoor and outdoor drainage pipes to replace traditional cast iron drainage pipes. With the development of China’s economy and the improvement of people’s living standards, a large number of residential buildings and public buildings need to be built and the amount of indoor drainage pipes drastically increased. In order to save metal pipes and reduce energy consumption,