地下停车库自动喷水灭火系统的设计与思考

Considerations on sprinkler system design for underground car parking yard

在地下停车库自动喷水灭火系统设计选型上 ,结合环境条件采用预作用自动喷水灭火系统时 ,平时不给管路充有压气体 ,对整个排气充水过程产生的不利灭火的影响并不大。探讨采用降低消防用水冰点达到防冻效果的可能性。在设计过程中喷头布置的根本原则是火灾发生时喷头能够动作 ,并能满足设计喷水强度的要求。此外 ,还应设法调整管道布置 ,保证均匀布水 ,并通过减压措施减小管路中的压力变化 ,防止流量过大 ,使储水能满足火灾延续时间 1h的灭火要求。

In case when the preaction sprinkler system adopted in underground car parking yard is just designed and installed according to the condition of ambient circumstance, no unfavorable effect will be caused to disturb the normal work of the fire control system, if no pressured air is pre-injected into the pipeline. The feasibility to reduce the ice point of firewater for freezing protection is discussed. The nozzles have to be laid to guarantee the fast action in fire cases. In design stage it has to be considered the rational layout of pipelines for uniform water supply, and pressure reducer is necessary to decrease the pressure variation inside the pipeline. The flowrate has to be controlled to hold the working time will not be lower than one hour.