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A brief description of the difficulties in smoke exhaust system in the design of smoke prevention and exhaust

Source:http://www.cdhbjn.com/news/742.html       Begintime:2018-04-13

The double color steel plate factory phenolic smoke control system design of the smoke in difficulties

1, natural smoke exhaust:

1, 4.9.3-4: the total area of the atrium, the stage can be opened outside the window should not be less than the atrium, the theater stage floor area 5%.

The 4.9.3-10, a construction area of more than 500 square meters of large space and headroom than 6m, should not be less than the ground area of 5%.

Third, 4.9.3-5: need to smoke evacuation corridors can be opened outside the window area should not be less than 2% of the area of the aisle.

Note: whether it is "building regulations" on the length of more than 40m or the evacuation passage, "high regulation" in the length of more than 60m in the aisle, such as a walkway multiple, the walkway into many segments. Each segment can be opened to meet the requirements of this section outside the window area, and a spacing to meet the smoke zone of the farthest point horizontal distance should not exceed 30m.

Fourth, 4.9.3-6: need to smoke room can be opened outside the window area should not be less than 2% of the area of the room.

5, 4.9.3-7: other places, should take the place of the construction area of 2%~5%.

6, 4.9.4: natural exhaust port setting requirements: should be set up in smoke on the roof or wall above the area; when set on the wall, the exhaust port should not be lower than the standard ceiling height /2 device and should be easy to open, and the opening direction of natural ventilation should be opened fire along the flow direction.

The construction area of more than 500 square meters, and more than 6m of the interior height atrium, exhibition hall, business hall, auditorium, gymnasium, passenger station, terminal and other public places to use the natural ventilation, should be set up and the automatic fire alarm system linkage or by other electric facilities to control the opening and closing of the automatic smoke exhausting window. Near the automatic smoke exhausting window should also be set up to facilitate the operation of the manual opening device.

S, 4.9.6: the specific requirements for the automatic smoke exhausting window opening on the exterior of the net area; when the shutter, the window for the effective area of net area multiplied by the coefficient of window. When using the rainproof shutter, multiplied by the coefficient 0.6; when using general shutters, the coefficient is 0.8.

2, mechanical exhaust:

1, 4.11.1-3 should be used when the structure of smoke wall, wall, ceiling and protruding of not less than 500mm beam smoke control zoning beams or other smoke wall from the indoor floor height of not less than 2.0m.

Clear height Hq=1.6+0.1H

Clear height: the smoke layer at the bottom to the mainland chamber level.

The net height of the building H- exhaust space.

Second, the same 4.11.1-4 smoke zone shall use the same exhaust.

The 4.11.2-3 level, the exhaust pipe through the other fire partition, should be arranged through the fire valve in 280 DEG C can be automatically closed, the fire resistance limit of pipeline shall not be less than 1 hours, the exhaust pipe should not cross the antechamber or staircase, if must pass through, the pipeline refractory limit should not be less than 2 hours, and shall not affect the evacuation.

The 4.11.2-6 garage, according to each smoke partition.

The 4.11.2-8, when the ceiling is combustible or difficult burning objects, in the ceiling exhaust pipes should be used with thickness not less than 50mm, poor thermal conductivity of insulation materials for thermal insulation or inflammable and combustible material, flame retardant material to maintain distance of not less than 150mm.

The 4.8.3.3, a multi-storey building set up show entertainment venues in one or two, three and building area of more than 200 square meters room or set in the four and four layers above or underground, semi underground dance entertainment; high-rise building is arranged in the first or two or three layer and set up in the basement of the public entertainment places.

Analytical:

First, many regulations in the "set in the four and four layers above or underground, semi underground public entertainment places" no area restrictions are required to smoke.

Second, high regulation only hope in this layer, the other layers have higher requirements.

Third, 4.11.4-4 in multi-storey buildings, underground, semi underground places set the mechanical exhaust system, in addition to public entertainment venues and building area of more than 50 square meters of the room, the exhaust port can be set in the evacuation passageway; the smoke evacuation and smoke corridor area by the area of the room, according to the the maximum per square meter area of not less than 120m3/h calculation.

Fourth, other:

A, 4.12.4-1: the fire valve should be set near the fire compartment, and away from the fire compartment at a distance not greater than 20mm.

B, 4.12.4-4: the fire valve setting should be charged signals in the ventilation and air conditioning systems in important parts of important buildings or through fire partition of dry pipe, and the signal into the fire control center; in the site or building not only affect the individual room with the fire control room set simple fire valve.

C, 4.11.2-8: when the ceiling is combustible or difficult burning objects, in the ceiling exhaust pipes should be used with thickness not less than 50mm, poor thermal conductivity of insulation materials for thermal insulation or inflammable and combustible material, flame retardant material to maintain distance of not less than 150mm.

"Code for fire protection design of buildings 10.3.11.

D, 4.9.1.3: this situation without mechanical ventilation.

E 4.8.3.2, a total construction area of more than 200 square meters of a room or building area of more than 50 square meters and people often stay or more combustible underground, semi underground building or basement, semi basement.

Analysis: 200 square meters do not include openable window (window wells)

The area of the room

The design of F, underground garage exhaust system: smoke exhaust system with fire, smoke exhaust can be used normally.

Analysis: Aluminum Alloy tuyere, adding fire over the fire resistance limit, then form a smoke hole, does not affect the exhaust effect; because the garage itself in fewer personnel casualties is the secondary factor.

G 4.9.1.3, which have a certain grammatical mistakes; she wanted to show the meaning is: a class of public buildings of more than 50m and more than 100m of the residential building, smoke proof staircase or common antechamber, such as a different orientation can be opened outside the window natural ventilation, the smoke proof staircase can not smoke prevention facilities. See 4.9.1-3.

H, 9.4.2-3 provisions 4/5 exhaust smoke zone in accordance with, without fire. Smoke not only the burden of the corridor area, including natural ventilation room. Can the natural ventilation room without fortification touchhole.

A class of public buildings and building I, more than 50m of the height of more than 100m of the residential building with smoke outside the window of the floor, staircase and vestibule pressurization respectively.

J, the "high regulation" 8.4.2.1 for a smoke control and exhaust or headroom than 6m not smoke zone area, should be per square area of not less than 60m3/h (calculation of the single blower minimum exhaust volume should not be less than 7200m3/h)

The brackets explain is the smallest smoke volume limit, rather than the single blower minimum smoke volume limit.

K, take two or more than two smoke partitions smoke, should according to the maximum smoke zone per square meter area of not less than 120m3/h.

Question: if the smoke control area is big, the fire smoke machine exhaust fan air volume is not consistent.

Measures: try to put the smoke control area partition; you can put some small area of the smoke zone is divided into a corresponding large smoke zone.

L, pressurized air duct made of metal or glass duct duct is feasible?

Analysis: can be used, but to add 70 degrees fire valve. According to the vertical pipe or the branch pipe connection approach. (two firedistricts).

M, a class of more than 50m on the part of a public building, outside the window of the stairwell to pressurization.

The underground smoke proof staircase whether windows can be opened, can be natural smoke?

Analysis: can. The reasons: first, the ground and underground are two stairs; on the stairwell pressurization because of considering the influence of wind pressure on natural smoke exhaust port; and the underground part of only one layer so without mechanical pressurization. But the natural smoke vent area of not less than 2 square meters.

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