中文摘要：

建筑排水管道中的压力波动是影响建筑排水系统通水能力的关键因素。简要描述了排水横干管中的水流运动状态及压力分布状况，并且通过模型试验研究了排水负荷对排水横干管不同位置处压力波动的影响。研究表明，排水过程中排水横干管中产生压力波动，引起直接连接在排水横干管处卫生器具的水封损失，进而影响通水能力。因此，在今后的建筑排水系统设计研究中应给予一定的重视。

英文摘要：

Pressure fluctuation in building drainage pipe significantly influences the capacity of the drainage system for carrying water. The flow regime and pressure distribution in main horizontal drainage pipe were described. The model test was carried out to study the relationship between drainage load and pressure fluctuation in the main horizontal drainage pipe. The results showed that pressure fluctuation in the main horizontal drainage pipe caused loss of water seal in sanitary ware that was directly connected, then affected the capacity for carrying water. Therefore, designers should consider pressure fluctuation in the main horizontal drainage pipe when designing drainage systems in the future.