《自动喷水灭火系统设计规范》GB50084—2001
一只喷头的保护面积 area of one sprinkler operation
同一根配水支管上相邻喷头的距离与相邻配水支管之间距离的乘积。 2.2 符 号
a——喷头与障碍物的水平间距
b——喷头溅水盘与障碍物底面的垂直间距 C——障碍物横截面的一个边长 d——管道外径
dg——节流管的计算内径 dj——管道的计算内径 dk——减压孔板的孔口直径 e——障碍物横截面的另一个边长
f——喷头溅水盘与不到顶隔墙项面的垂直间距 g——重力加速度
h———系统管道沿程和局部的水头损失 H——水泵扬程或系统入口的供水压力 Hg——节流管的水头损失 Hk——减压孔板的水头损失 i——每米管道的水头损失 k——喷头流量系数 ——节流管的长度 L
n——最不利点处作用面积内的喷头数 P——喷头工作压力
P0——最不利点处喷头的工作压力 q——喷头流量
qi——最不利点处作用面积内各喷头节点的流量 Qs——系统设计流量 V——管道内水的平均流速 Vg——节流管内水的平均流速 Vk——减压孔板后管道内水的平均流速
Z——最不利点处喷头与消防水池最低水位或系统入口管水平中心线之间的高程差
ζ——节流管中渐缩管与渐扩管的局部阻力系数之和 ξ——减压孔板的局部阻力系数
自动喷水灭火系统应有备用喷头，其数量不应少于总数的1,，且每种型号均不得少于10只
串联接入湿式系统配水干管的其他自动喷水灭火系统，应分别设置独立的报警阀组，
其控制的喷头数计人湿式阀组控制的喷头总数。 6.2.3 一个报警阀组控制的喷头数应符合下列规定:
1 湿式系统、预作用系统不宜超过800只;干式系统不宜超过5OO只。 2 当配水支管同时安装保护吊顶下方和上方空间的喷头时，应只将数量较多一侧的喷头计入报警阀组控制的喷头总数
deformation small; Dang engineering pile also for perfusion pile Shi, can synchronization construction, to construction conducive to
organization, and convenient, and duration short; pile between gap easy caused soil erosion, special Shi in high level soft clay quality area,
needed according to engineering conditions take note pulp, and cement mixing pile, and spin spray pile, construction measures to solution block water problem; Suitable for soft clayey and sandy areas, but construction should be used with caution in the gravel and pebbles; between pile and pile through the pile top beam and wall purlins into overall and thus relatively poor overall, as in important areas, special projects and large Foundation pit in excavation depth application requires special care. 2.1.6 steel piles using steel piles supporting the Foundation pit for temporary support features, construction convenient, short, finished construction in Foundation pit backfill after the channel pulled out, re-use, can minimize the cost of support. Used steel piles supporting a fatal weakness, that is impervious to water and small soil particles, and also called as high water
precipitation or water, and the underground water level is high, water-rich geological conditions did not match. Flexural capacity of steel sheet pile supporting weaker excavation depth does not exceed 4m deflection of more general application. Obviously the soft water of Foundation pit excavation depth of geological conditions of 10m, and is located in the city centres of Flex ... Limited to, work hard, and it can take full advantage of building line the walls within a limited number of ground and space, can give full play to its economic benefits, in the course of construction,
水力警铃的工作压力不应小平0.05MPa，并应符合下列规定: 1 应设在有人值班的地点附近;
《自动喷水灭火系统设计规范》GB50084—2001
