The fire ladder of the building adopts glass windows for smoke prevention and exhaust instead of pre

Natural smoke exhaust type.

National Standards of the People's Republic of China.

Code for fire protection design of high-rise civil buildings.

code for fire protection design of tall buildings

The window area with natural smoke exhaust shall comply with the following provisions:

The area of openable external windows in the front room of smoke-proof stairwell and fire elevator room should not be smaller, and the shared front room should not be smaller.

The sum of the total area of openable exterior windows in every five floors of the smoke-proof stairwell against the exterior wall should not be less than.

The area of the openable exterior window of the inner walkway with a length of no more than 60m shall not be less than 2% of the walkway area.

The area of openable external windows in the room where smoke is required should not be less than 2% of the area of the room.

The area of the openable skylight or high side window of the atrium with a clearance height of less than 12m shall not be less than 5% of the floor area of the atrium.

According to the provisions of the "Code for Fire Protection Design of Buildings" and the "Code for Fire Protection Design of High-rise Civil Buildings", this method is natural smoke exhaust, but the windows set up in the evacuation stairwell should be openable external windows, preferably blinds.

Answer]: C adopts mechanical pressurized air supply and smoke-proof stairwell, the pressure difference between the stairwell and the walkway should be 40-50pa, the front room, the shared front room, the front room of the fire elevator room, and the residual pressure value of the closed stairwell is 25-30pa.

Answer]: B set up a mechanical pressurized air supply Li Zhaoqiao system of closed stairwells, smoke-proof stairwells, Shang Nameng should be set at the top of the fixed window not less than 1m2 of the bridge.

Answer]: A textbook p490

For buildings with a building height of less than or equal to 50m, when it is difficult to set up a pressurized air supply shaft (pipe) in the stairwell, the stairwell can adopt a direct irrigation pressurized air supply system, and the following provisions shall be met: 1) For high-rise buildings with a building height greater than 32m, the air supply method of two points in the stairwell should be adopted, and the distance between the air supply outlets should not be less than the height of the building1 The air supply volume shall be increased by 20% according to the calculated value or the air supply volume specified in Article 1 of this standard. 3) The pressurized air supply outlet should not be located in the early attack affecting the evacuation of personnel.

Answer]: B textbook p495

1) In addition to the direct irrigation air supply mode, the stairwell should be equipped with a normally open louver air supply outlet every 2 or 3 floors; The two stairwells of the shaft scissors staircase should be divided into a separate Mei partition and a floor to be provided with a normally open louver air outlet. (2) The front room should be equipped with a normally closed pressurized air supply outlet on each floor, and a manual opening device should be set up. Therefore, choose B.

Answer] :d According to the application of measuring instruments in Chapter 2, it can be seen that the air pressure in the stairwell in the smoke prevention and ventilation project is 40pa 5.

Answer]: The evacuation staircase of a high-rise Suisui factory and a multi-storey factory building of class A, B and C should be closed stairwells. The garment processing plant belongs to the class C plant, the machinery repair plant belongs to the class E plant, the automobile factory plant belongs to the class E plant, and the Biquelu metal smelting plant belongs to the class D plant.

Therefore, the answer is hand A.

Summary. Pro, the safety exit is a stairwell with a door at the entrance of the stairwell to prevent the smoke and heat of the fire from entering.

Pro, the safety exit is a stairwell with a door at the entrance of the stairwell to prevent the smoke and heat of the fire from entering.

1. Residential buildings with a building height of more than 27m and non-single-storey factories, warehouses and other civil buildings with a building height of more than 24m.

2. The podium is outside the projection range of the main body of the high-rise building, connected to the building and the building height is not more than 24m.

Shops, post offices, savings offices, barber shops and other small commercial housing that are set up on the first or second floors of residential buildings, and each of them separates small commercial housing such as shops, post offices, savings offices, and barber shops with a construction area of no more than 300 m2. Brigade do.