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目前我市铺设上水钢管管道工程、设计要求管道内壁涂抹一层冷底子油,冷底子油重量配合比为1:2.5(沥青:汽油)。根据多项工程实践,证明冷底子油不能与钢管长期粘结牢固,特别是经水浸泡后,脱落更快。仅水源八厂为例,其中φ1400配水管,长4.6公里,内壁涂冷底子油8~T,用工3600个,造价1.2万元,于1977年10月开始施工,78
At present, the city’s laying of water pipe pipe project, the design requires the application of a layer of cold base oil on the inner wall of the pipe, the cold base oil weight ratio of 1:2.5 (asphalt: gasoline). According to a number of engineering practices, it has been proved that the cold bottom oil can not be firmly bonded with the steel pipe for a long time, especially after being soaked in water, it falls off faster. For example, only the Eight Water Plants, including φ1400 water distribution pipes, 4.6 km long, 8 to T cold oil on the inner wall, 3,600 laborers, and a construction cost of 12,000 yuan, started construction in October 1977. 78