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1前言蒸汽管道敷设有3种方式:架空敷设、地沟敷设和直埋敷设。随着城市建设的发展和环境保护、节约能源的需要,城市集中供热管网近年来均采用直埋敷设技术,广泛采用直埋保温管和直埋波纹补偿器。管道直埋敷设与传统的地沟敷设相比,具有保温性能好,施工安装方便,占地面积小,施工周期短,工程造价低等优点,是一项涉及到传热学、材料力学、流体力学、防腐等多学科的系统工程。但由于目前我国尚无直埋蒸汽管道设计规范及相应技术规程,部分直埋蒸汽管道在设计、选材、保温等环节
1 Introduction Steam pipe laying in 3 ways: overhead laying, trench laying and burial. With the development of urban construction and environmental protection, energy conservation needs, urban central heating pipe network in recent years have adopted direct laying technology, widely used direct buried insulation pipe and burial bellows. Compared with the traditional trench laying, the pipeline buried directly has the advantages of good thermal insulation performance, convenient installation and installation, small occupied area, short construction period and low construction cost. It is an important project involving heat transfer, material mechanics, fluid mechanics , Anti-corrosion and other multidisciplinary systems engineering. However, due to the fact that there is no direct steam pipeline design norms and corresponding technical regulations in our country, some of the buried steam pipes are in the design, material selection and insulation