高层建筑消火栓给水系统分区静水压力计算
陈礼洪1,程宏伟2,蒋柱武1
(1.福建工程学院环境与设备工程系,福建福州 350007;2.福建省建筑设计研究院,福建福州 350001)
摘要:高层建筑消火栓给水系统合理分区关系到系统的安全运行和可靠性,正确计算消火栓给水系统分区静水压力是合理分区的关键。
分区最大静水压力与供水方式密切相关,在分析总结高层建筑消火栓给水系统各种供水方式的基础上,归纳提出3类分区静水压力的计算形式,并推导出分区最低消火栓静水压力计算公式和分区最高消火栓或分区减压阀组与最低消火栓高差计算公式。
关键词:消火栓给水;系统分区;静水压力计算
Calculation of hydrostatic pressure of fire hydrant system in
high-rise building partition
Chen Li-hong1 , Chen Hong-wei2, Jiang zhu-wu1
(Environment and equipment Engineering Department of Fujian University of Technology, Fuzhou, Fujian, 350007. Architectural Design Institute of Fujian Province,Fuzhou,Fujian,350001)
Abstract: Reasonable partition of fire hydrant water supply system of high-rise building is related to the safe operation and reliability of the system. Correct calculation of hydrostatic pressure of the fire hydrant water system is the key to reasonable partition of the building. The maximum hydrostatic pressure of fire partition and water supply modes of fire hydrant systems are closely related. Based on the analysis of various modes of fire hydrant water systems, three calculation models of hydrostatic pressure of fire partition were derived and summarized. The calculation formulas of minimum fire hydrant hydrostatic pressure were derived and the calculation methods of the relative altitude between the highest fire hydrant or partition valve group and the lowest fire hydrant were also deduced.
Key words: Fire hydrant system, Building partition, Hydrostatic pressure calculation
0 引言
消火栓给水系统是高层建筑的主要灭火设施,
消火栓给水系统给水分区是高层建筑设计中常遇
到的技术问题。
《高层民用建筑设计防火规范》
(GB50045-95,2005年版,以下简称“高规”)第
7.4.6.5条规定“消火栓栓口的静水压力不应大于
1.0MPa,当大于1.0MPa时,应采取分区给水系
统??” [1]。
分区静水压力值规定不应大于1.0MPa
的原因主要是考虑消防给水管网及各组件的承压
能力、减压方式及可行性[2],此外,还关系到系统
运行的安全性,因此,工程设计时严格执行第7.4.6.5
条规定是非常必要的。
执行第7.4.6.5条规定的关键是正确计算分区静水压力值。
对静水压
力的理解,有不少工程技术人员简单理解为消防水箱到消火栓口的垂直高差,正确的理解应是消火栓给水系统水流处于静止状态时相应点的测压管水头高度,因此,消火栓给水系统分区静水压力与其各分区供水方式密切相关,应根据其供水方式合理计算静水压力值后进行合理分区。
总结高层建筑消火栓系统各种供水方式的情况,归纳起来有3种分区静水压力的计算。
1 单设高位消防水箱(池)稳压的高区静水压力计算“高规”第7.4.7.2条规定:“高位消防水箱的。