Composite pipe gallery (common ditch, composite pipe trench), is the "underground city pipeline corridor", which built a tunnel in the urban underground space, the municipal, electricity, communications, gas, water supply and drainage pipeline set at an organic whole, is equipped with special access port, hoisting and monitoring system, the implementation of unified planning, unified design, unified construction and management. Important infrastructure and "lifeline" to ensure the operation of the city. HMPP twin-wound pipe with large diameter can be used as pipe gallery, and its engineering cost and cycle have outstanding advantages over concrete pipe gallery.