DN1600预制直埋保温管道生产研究与工程应用

Research and Engineering Application of DN1600 Pre-insulated Directly Buried Pipe

DN1600预制直埋保温管道规格大、容量高,对管道的生产、运输和施工都提出了更高的要求。本文阐述了DN1600预制直埋保温管道的生产工艺过程,提出了保证管道同心度和圆度、支撑防护、发泡设备及发泡方式改进、聚氨酯泡沫化学原料配方调整等措施,以及管道运输与现场接头保温方法。经检验,所生产的DN1600预制直埋保温管道的各项性能指标满足GB/T 29047-2012标准要求,示范工程已通过了2017年-2018年供暖季的运行检验。

Because of the big diameter and weight, DN1600 Pre-insulated directly buried pipe has higher requirements in manufacture, transportation and construction. This paper expounds the production process of DN1600 directly buried and Pre-insulated pipe,and puts forward measures such as ensuring pipe concentricity and roundness, supporting and protecting, improving foaming equipment and foaming mode, adjusting chemical raw material formula for polyurethane foam, as well as the method of pipe transportation and field joint assembly. The performance indexes of DN1600 prefabricated directly buried thermal insulation pipe meet the requirements of GB/T 29047-2012 standard, and the demonstration project has passed the operation test of heating season 2017~2018.