地铁消火栓给水系统分区方案

阐述地铁工程消火栓给水系统的特点,从市政水源条件、车站土建规模、运营模式、防迷流措施、系统控制、技术经济等方面,对城市地铁工程消火栓给水系统两种消防供水分区方案加以分析研究,结合《消防给水及消火栓系统技术规范》(GB 50974—2014)(简称"水消规")中消防泵自动启泵方式对消防供水分区方案的影响、建设及运营经验,研究确定更优化的"一站+一区间"给水分区方案,以减少区间消防水管过轨,降低火灾报警系统FAS控制模式的复杂性,满足"水消规"启泵方式对消火栓给水系统的要求。将各种外界因素对地铁工程建设和运营安全的影响尽可能地降低,为保证区间供水安全提出合理化建议,提出在增加压力开关启泵方式的情况下,保留传统的消火栓按钮,通过FAS启泵方式,选用直径较大的9喷嘴水枪,实现系统初期的火灾最小消防流量大于系统正常泄漏量,增加一套增压稳压设备控制进水压力,实现管网泄漏补水和系统的自动启动,提高消防供水的安全性和可靠性。

Division of Hydrant Water Supply System in Subway Station

The characteristics of hydrant water supply system for subway engineering are expounded.Two different division scenarios of water supply systems for fire hydrants used in subway are studied in terms of municipal water source condition,architecture dimensions,operation mode,anti-stray current measures,system control and technical economy.Considering the influence of the automatically triggered pump on the division of water supply systems recorded in Code of design on fire protection water supply and hydrant systems (GB 50974-2014),based on the experience in construction and operation,a more effective division scenario of water supply systems is developed,in which one sectional area is equipped together with one adjacent station.This system can minimize the overlap between the water pipes for hydrants.Moreover,it can reduce the complexity of the FAS-controlled electrically operated valve in fire disasters,which meets the ideas in the new standard and improve the reliability of pipe-network based water supply systems.This study can also eliminate the impacts of various exogenous factors on the construction and operation safety of subways.Then,several suggestions are proposed to ensure the safety of water supply in sectional areas.Both the pressure switch pump start mode and the traditional fire hydrant button by FAS are retained.The larger diameter up to φ9 water gun nozzle is used to achieve the result that the initial minimum flow is greater than the normal fire system leakage.A set of equipment with pressure increasing and stabilizing fire-extinguishing is added to realize network leakage and replenishment implementation of the system.Through all the above measures,the safety and reliability of hydrant water supply will be improved.