伸顶通气排水系统脉冲压力平均值探讨

以7层PVC-U伸顶通气单立管排水试验装置为研究对象,对立管中压力、最易发生水封破坏的第6层横支管压力及水封损失三者之间的关系用脉动平均值进行比较分析,得出其横支管的压力衰减关系.分析在一次和多次连续放水的情况下,水封损失的变化.试验结果表明:只放水一次,在流量为6.16 L/s时,其水封损失为30 mm,达到水封破坏的临界值;多次连续放水,在流量为5.59 L/s时,其水封损失为27 mm,接近水封破坏的临界值.

Case study on the average pulse pressure of PVC-U draining system

In this research, a seven-floors PVC-U draining system was used as the object of study. The relationship among the air pressure in the vertical pipe, the air pressure in the 6th floor horizontal branch pipe that had the highest frequency of water seal damage, and loss of water seal was compared and analyzed by fluctuation method, and the rate of pressure loss in horizontal branch pipe was obtained. Furthermore, the variation of the water seal loss was analyzed. The results showed that, in case of one time draining when the flow rate was 6.16 L/s, the water seal loss was 30 mm (reaching critical value of water seal damage); in case of continuous draining when the flow rate is 5.59 L/s, the water seal loss is 27 mm (being close to critical value of water seal damage).