有障碍物场所自动喷水灭火系统喷头布置的应用分析

Sprinkler set of auto-sprinkler system with infect of obstacle

某地下车库,无吊顶,主梁间距8m×8m,次梁间距4m×4m,经计算,取3排支管,支管上布置4只喷头。有障碍物结构下喷头布置时,应确保一只喷头的保护面积不小于梁格围合的面积。梁格间布置1只喷头时可采用较小的喷头或控制喷头工作压力,但应确保不低于0.05MPa,以降低系统用水量。如果喷头的洒水受到障碍物的遮挡,则应在障碍物下方增设喷头,增设的喷头可不叠加到系统的设计流量中。

The main girders were set as 8 m×8 m and hypo-girders were set as 4 m×4 m in a underground stopping place with no suspended ceiling.Each pipe of 3 has 4 sprinklers according calculation.The area protected by sprinkler should bigger than the area surrounded by girder if there is obstacle.Sprinkler with small resistance value could be used or press of sprinkler could be controlled to decline the water consumption if there is 1 sprinkler in area surrounded by girder,but the press should not lower than 0.05 MPa.An other sprinkler should be set under the obstacle if the spray above the obstacle was obstructed.The design flow may not calculate the sprinkler added.