Contact

    Chengdu Huibao Energy Technology Co., Ltd.
  • Contact :Mr.Li
  • Tel:028-82213905
  • Mobile:13980030203
  • Fax:028-82213905
  • Email:lizh6688@163.com
  • Website:en.cdhbjn.com
  • Address:Economic Development Zone , Chengdu City , Sichuan Province , Chongzhou innovation Lixing Avenue home of C49

Details of the news首页 > Corporate News > A brief introduction to the difficulties of smoke control system in smoke control design

A brief introduction to the difficulties of smoke control system in smoke control design

Source:http://en.cdhbjn.com/news346250.html       Begintime:2018-04-13 10:19:00

A brief introduction to the difficulties of smoke control system in smoke control design

1. Natural smoke exhaust:

① 4.9.3-4: the total area of the openable external windows of the atrium and theater stage shall not be less than 5% of the floor area of the atrium and theater stage building.

② 4.9.3-10: for large space places with a building area greater than 500 ㎡ and a clear height greater than 6 m, it shall not be less than 5% of the ground area of the place.

③ 4.9.3-5: the area of the openable external window of the evacuation corridor requiring smoke exhaust shall not be less than 2% of the corridor area.

Note: whether the above ground length of evacuation walkway is more than 40m as described in the building code, or the length of internal walkway is more than 60m as described in the high code, if the walkway is opened in multiple places, the walkway can be considered in sections. The area of each section of openable external window meets the requirements of this article, and the horizontal distance between the farthest points of the smoke control area should not exceed ± 30m.

④ 4.9.3-6: the area of the openable external window of the room requiring smoke exhaust shall not be less than 2% of the area of the room.

⑤ 4.9.3-7: for other places, 2% - 5% of the building area of the place should be taken.

⑥ 4.9.4: requirements for the setting of natural smoke vent: it shall be set on the roof of smoke exhaust area or above the external wall; when it is set on the external wall, the bottom mark of smoke vent shall not be lower than / 2 of the indoor clear height, and there shall be a device convenient for opening, and the opening direction of natural vent shall be opened along the direction of fire air flow.

⑦ When the atrium, exhibition hall, auditorium, business hall, gymnasium, passenger station, terminal and other public places with a building area of more than 500 ㎡ and indoor clear height of more than 6m adopt natural smoke exhaust, automatic smoke exhaust windows linked with the automatic fire alarm system or controlled by other electric facilities shall be set. A manual opening device convenient for operation shall be set near the automatic smoke exhaust window.

⑧ 4.9.6: there are specific provisions for the net area of the automatic smoke exhaust window on the external wall; when the shutter is used, the effective area of the window is the net area of the window multiplied by the coefficient. When rainproof louvers are used, the coefficient is multiplied by 0.6; when general louvers are used, the coefficient should be 0.8.

2. Mechanical smoke exhaust:

① 4.11.1-3 the structural beams protruding not less than 500mm under the smoke vertical wall, partition wall and ceiling shall be used to divide the smoke prevention zone, and the height of the beams or other smoke vertical walls from the indoor ground shall not be less than 2.0m.

Clear height HQ = 1.6 + 0.1h

Clear height: the height from the bottom of the smoke layer to the interior plane of the room.

H - building clear height of smoke exhaust space.

② 4.11.1-4 the same smoke control zone shall adopt the same smoke exhaust method.

③ 4.11.2-3 when passing through other fire zones, 280 ℃ fire damper which can be closed automatically shall be set at the crossing place. The fire resistance limit of the pipeline shall not be less than 1 hour, and the smoke exhaust pipeline shall not pass through the front room or stairwell. If it is necessary to cross, the fire resistance limit of the pipeline shall not be less than 2 hours, and personnel evacuation shall not be affected.

④ 4.11.2-6 garages shall be set according to each smoke control zone.

⑤ 4.11.2-8 when there are combustibles or incombustible substances in the ceiling, the smoke exhaust pipe in the ceiling shall be insulated with incombustible heat insulation materials with thickness of not less than 50mm and poor thermal conductivity or kept at a distance of not less than 150 mm from combustibles and incombustible substances.

⑥ , 4.8.3.3 the multi-storey buildings are set on the first, second and third floors, and the building area of the room is more than 200 ㎡, or the song and dance entertainment screening and entertainment places are set on the fourth floor or above, or underground or semi underground; the high-rise buildings are set on the first floor or the second and third floors, and the song and dance entertainment screening and entertainment places are set on the first floor.

Analysis:

① In the regulations, there is no limitation on the area of "singing, dancing, entertainment, screening and entertainment places set on or above the fourth floor, or underground or semi underground", and smoke exhaust is required.

② The high-level planning only wants to be set in these layers, and other layers have higher requirements.

③ 4.11.4-4 in multi-storey buildings, the underground and semi underground places equipped with mechanical smoke exhaust system can be set in the evacuation walkway except for the places for singing and dancing entertainment and entertainment and the rooms with a building area of more than 50 ㎡; the smoke exhaust volume is calculated and determined by comparing the area of the evacuation walkway and the area of each room requiring smoke exhaust according to the maximum area of not less than 120m3 / h per square meter.

④ , others:

a. 4.12.4-1: the fire damper should be set close to the fire compartment, and the distance from the fire compartment should not be greater than 20 mm.

b. 4.12.4-4: the fire damper with live signal should be set at the important parts of important buildings or the main pipe of ventilation and air conditioning system passing through the fire compartment, and the signal should be introduced into the fire control center; the simple fire damper should be set when there is no fire control room in the parts or buildings that only affect individual rooms.

c. Article 4.11.2-8: when there are combustibles or refractory materials in the ceiling, the smoke exhaust pipe in the ceiling shall be insulated with non combustible heat insulation materials with a thickness of not less than 50 mm and poor thermal conductivity or keep a distance of not less than 150 mm from combustibles and refractory materials.

Article 10.3.11 of code for fire protection design of buildings.

d. 4.9.1.3: in this case, mechanical pressurization is not required.

e. 4.8.3.2 underground or semi underground buildings or basements or semi basements with a total floor area of more than 200 ㎡ or a room with a floor area of more than 50 ㎡ and often occupied by people or with more combustibles.

Analysis: 200 ㎡ excluding the openable external window (window well)

Room area

f. Smoke exhaust system design of underground garage: smoke exhaust and air exhaust system, and the fire smoke exhaust port can adopt the normal exhaust port.

Analysis: the aluminum alloy tuyere, when added to the fire, exceeds the fire resistance limit, and then forms a smoke exhaust hole, which does not affect the smoke exhaust effect; because the garage itself has fewer people, it is a secondary factor in casualties.

g. 4.9.1.3 there are some grammatical errors in this article. What she wants to explain is: Super


028-82213905
hotlines for national customer service

Address:Economic Development Zone , Chengdu City , Sichuan Province , Chongzhou innovation Lixing Avenue home of C49