底部连接对副通气立管排水系统通水能力的影响

Influence of Bottom Connection on Capacity of Secondary Vent Riser in Building Drainage System

排水立管底部的水体流速较大,因此流态波动性极强,往往会产生极大的正压。基于此,在60 m高全尺寸实验塔内对设副通气立管的环形通气排水系统进行了通气立管底部连接方式的对比实验,分析了排水过程中各测试楼层的压力波动、水封损失、排水系统通气量的变化规律。结果表明,通气立管底部连接在排水立管上的工况最大通水能力为8.5 L/s,而连接在横干管的工况最大通水能力提升了100%(17.0 L/s)。对于通气立管连接到排水立管后由排水立管伸顶通气的连接方式,通气立管未连接底部排水干管的仅为7.0 L/s,而底部连接的最大通水能力为12.5 L/s。由此可见,通气立管底部连接至排水横干管的工况能够极大地提高排水系统的通水能力,在工程中可以通过改变连接方式来提高系统的排水能力。

The water flow rate at the bottom of drainage riser is large,so the flow pattern is extremely volatile and often produces great positive pressure.Therefore,this paper compared the pressure fluctuation,water seal loss and airflow rate of each test floor in a circuit vent drainage system belonged to a 60‑meter‑high full‑size experimental tower with different bottom connection modes of secondary vent riser.The maximum discharge capacity of the system with bottom of the vent riser connecting to the drainage riser was 8.5 L/s,while the maximum discharge capacity of the system with bottom of the vent riser connecting to the horizontal main was increased by 100%(17.0 L/s).For the system with vent riser connecting to the drainage riser and vented by the top of drainage riser,the maximum discharge capacity was only 7.0 L/s when the vent riser was not connected to the bottom main,and the maximum discharge capacity of the system with vent riser connecting to the bottom main was 12.5 L/s.Therefore,the bottom of the vent riser connecting to the horizontal main greatly improved the drainage capacity of the drainage system,and the drainage capacity could be improved by changing the connection mode in engineering.