近年来居住小区建设的实践证明,住宅建设一定要按照先做地下管网,后做地上建筑的合理程序进行。否则,住宅建成不可能及时交付使用,并将造成人力、物力的浪费。北京在六十年代新建的左家庄居住小区,特别注意到管网的规划设计,以及设计与施工程序中的配合。左家庄小区是按照先地下,后地上的原则施工的。由于管网布置复杂,在做管网规划设计时, In recent years, the practice of residential community construction has proved that residential construction must be done in accordance with the underground pipe network first, and after doing a reasonable procedure for building on the ground. Otherwise, the completion of the housing could not be delivered in time and it would cause waste of human and material resources. The Zuojiazhuang residential area newly built in Beijing in the 1960s paid special attention to the planning and design of the pipeline network and the cooperation in the design and construction procedures. Zuojiazhuang Community is built on the principles of first underground and later ground. Because the layout of the pipe network is complicated, when planning and designing the pipe network,