根据发达国家的经验,塑料管应用量最大的领域为排水、排污管,主要是室外的埋地排水、排污管。我国过去在埋地排水领域应用塑料管最为落后,原因一是我国过去对于环境保护不够重视,排水管的建设投资不足;原因二是我国 According to the experience of developed countries, the plastic pipe is the most widely used areas of drainage, sewage pipes, mainly outdoor outdoor drainage, sewage pipes. In the past, the plastic pipe in the field of buried drainage was the most backward in our country. One reason is that in the past, China did not pay enough attention to environmental protection and did not invest enough in the construction of drainage pipes. The second reason is that China