分期更新改建的建筑群室外地面排水不良北京铁路局北京勘测设计院李秀英现象逐年分期更新改建的建筑群，每一建筑物建成后，其周围的室外地面排水不良，大雨时部分道路积水不便行走。原因分析１．分期更新改建的建筑群，在工程逐步实施过程中，建筑专业设计人员与排水专业... Poor outdoor drainage of buildings renovated in phases The Beijing Railway Bureau Beijing Investigation and Design Institute Li Xiuying’s phenomenon is updated and reconstructed every year. After each building is completed, the surrounding outdoor surface is poorly drained, and some roads cannot be walked when there is heavy rain. . Analysis of the reasons 1. In the phased updating and reconstruction of the building complex, the construction professional design personnel and drainage professional...