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长期来,杜绝或减少管网漏水是给水工程中一项重大的研究课题。为消除或减少管网漏水,需对使用年代长久的、漏水量较大的旧管道加以更换,但有些管道更换十分困难,往往使旧管道的更新不能按计划实现。为方便旧管道的更换,近年来研究成功了一种新的管道更新方法——聚乙烯塑料管衬里更新法。一、聚乙烯塑料管衬里更新法概要 (一)大口径管道(直径250～1000毫米)的更新旧铸铁管的更新方法是,先将铸铁管内铁锈和污垢刮除和冲尽,然后,在其中插入外径略小于铸铁管内径的聚乙烯塑料管,在
In the long run, preventing or reducing the leakage of pipe networks is a major research topic in water supply projects. In order to eliminate or reduce the leakage of pipeline networks, it is necessary to replace old pipelines that have been used for a long time and have a large amount of leakage, but it is very difficult to replace some pipelines, and the old pipelines are often not updated as planned. In order to facilitate the replacement of old pipelines, a new method of pipeline renewal has been successfully researched in recent years—the polyethylene plastic pipe lining renewal method. First, the renewal of polyethylene plastic pipe lining method outline (a) of the large-diameter pipe (diameter 250 ~ 1000 mm) of the old method of renewal of cast iron pipe is to first remove the iron rust and dirt within the cast iron pipe, and then, in which Insert a polyethylene plastic pipe with an outer diameter slightly smaller than the inner diameter of the cast iron pipe.