论文部分内容阅读
(1)天津市自来水公司自意大利引进流水线生产我国北方热网采用的直埋式预制管,其内为输送工作介质的钢管、中间为聚胺脂泡沫塑料保温层、外壳为高密度聚乙烯管或钢管。由于其防水绝缘性能好,可以直埋于地下,因此具有占地少、施工方便等优点,较地沟敷设可节省投资30～40%,但其耐温为120℃,局限于热水和凝结水管道上。在哈尔滨市、天津市、牡丹江市已使用。
(1)Tianjin Water Supply Co., Ltd. Introduces an assembly line from Italy to produce a direct-buried prefabricated pipe used in the Northern China Thermal Power Network. The pipe is used to transport the working medium, the middle is a polyurethane foam insulation layer, and the outer shell is a high-density polyethylene pipe. Or steel pipe. Because of its good waterproof insulation properties, it can be directly buried in the ground, so it has the advantages of less land occupation, convenient construction, etc. It can save 30-40% investment compared to the trench laying, but its temperature resistance is 120°C, limited to hot water and condensed water. On the pipeline. It has been used in Harbin, Tianjin and Mudanjiang.