出户排水管管径偏小北京铁路局太原勘测设计院王雨平现象公共建筑、居住建筑的出户排水系统经常发生堵塞，造成使用不便。原因分析１．设计人员未考虑建筑物排水系统的实际情况，盲目按照现行设计规范规定的最小排水管管径选择出户排水管，导致排水不畅，需要经常维修。２... Drainage pipe diameter of households is too small Wang Yuping, Taiyuan Survey and Design Institute, Beijing Railway Bureau Phenomenon Drainage systems in public buildings and residential buildings are frequently blocked, causing inconvenience in use. Analysis of the reasons 1. Designers did not consider the actual situation of the building’s drainage system and blindly selected the household drainage pipe according to the minimum drainage pipe diameter prescribed in the current design specification, resulting in poor drainage and requiring frequent maintenance. 2...