and  set the security  evacuation signs. The safe evacuation  distance of most negative point is
21.8m.
Evacuation staircase used scissors stairs, set the pressurized air supply system.
A share room is available. First floor is equipped with 3 safety exits to outdoor straightly,
the rest of the layers of safety exits number 2, comply with the requirements of the specification.
All public evacuation doors open to evacuation direction. At the top of the safe exit set safety
exit sign, the evacuation corridor and corner from the ground 1.00m on the wall of the
evacuation aisle marketed with the symbol. The building is equipped with stairs stairwells and
fire elevator. The front room’s door adopt B fire door, and open to the evacuation direction. The
distance are not exceed 30m, from the fire elevator room to direct outdoor outlet.
Fire hydrant system design: the water consumption of outdoor fire hydrant water supply
system is 15L/s, supplied by the municipal pipe network, is not stored in the fire pool. Around
the buildings and along the road lay out 2 outdoor fire hydrants.
The indoor fire water supply system is separated from life, production water supply system
independent setting, and the water supply pipeline layout into a ring. The introduction tube of
Indoor fire water pipe network and regional annular pressure or high-pressure water supply
system set to 2. Fire hydrant water is designed to 20L/s. By calculation, fire hydrant layout
spacing of 28.1 m, and set 3 fire standpipe. At the time，to layout three fire hydrant On each
floor of each building . In the position of the elevation of 74.2m to set roof water tank, the fire
water tank of the working volume of 26.47 m3
, and set the pressure facilities. Equipped with a
fire pool, the effective volume of 250m3
.The two buildings only need to set up a fire pool.
Indoor fire hydrant water supply pipeline flow rate of 44.123 L/s, the total pressure is
0.99765MPa. Selection of fire pump models for XBD-SBL, one with a case, and Capacity to 45
L/s, rotating speed of 3000 r/min, the shaft power 0f 32.3kw.   
Fire extinguisher configuration design: A high-rise office building, the risk level for design
objects is less dangerous level. The main fire type is a class fire and solid E class fire.  In the
design process, each floor will be pided into independent cell, and protection area is 424.67m2
.
The calculation of the unit demanded with minimum fire rating according to the calculation of
unit area, each calculation unit minimum need fire control level for 4A. Choosing portable fire
extinguisher, its maximum protection distance is 20 m. Sure fire extinguisher the set point for
the three, each fire extinguisher setting minimum required level of fire for 3 a. By protective
circle simplify the design method to determine the fire extinguisher set the point, every floor is
equipped with 3 set points.
The type of fire extinguishers  for MF/ABC5 fire extinguisher,  each set point matching
with 2 MF/ABC5 portable fire extinguishers and use the wall embedded fire extinguisher box.
Mechanical pressure air supply systems design: mechanical pressure air supply system
must be set up in the smoke prevention stair well. Stair case pressurization air outlet layout in
every two or three layers while the antechamber is provided with 1.
The design of air flow is 19861m3
/h, the design of wind speed is 6m/s. The tuyere area
tuyere area is 0.5 m2
, select the 850mm × 600mm since the vertical type louver, tuyere area of
0.5 m2
. Then, select 850 mm x 600 mm since the vertical type shutter tuyeres.
 
Key words: high-rise buildings; hire safety status; fire hydrant; fire extinguisher；pressurized
air supply 高层住宅的消防安全现状分析与消防设计(3):http://www.751com.cn/gongcheng/lunwen_7327.html