城市地下管线 (包括海底、水下的管线 )和架空杆线是城市的血管和神经。随着城市经济发展和文明程度的提高 ,多数地上杆线转入地下。密如蛛网的城市地下管线 ,承载着各种物质流、能源流和信息流 ,使城市昼夜不息、井然有序地运转。由于我国城市基础差 ,发展速度快 ,道路、管线 Urban underground pipeline (including the sea, underwater pipeline) and overhead pole is the city’s blood vessels and nerves. With the development of the city’s economy and the improvement of the level of civilization, most of the above-ground routes turn underground. Closely cobweb city underground pipeline, carrying a variety of material flow, energy flow and information flow, so that the city day and night, in an orderly manner. Due to poor urban infrastructure in China, the development speed, roads, pipelines