Is there a closed staircase leading to the basement?
The size of the front room, public buildings should not be less than 6 square meters, and the fire elevator with the former room without less than 10 square meters, for residential buildings should not be less than 4.5 square meters, combined with the fire elevator area should not be less than 6 Square meters; for civil air defense projects should not be less than 10 square meters.
Smoke staircase front room area, public buildings should not be less than 6.00m2, residential buildings should not be less than 4.50m2;
Fire elevator should be located in the front room, its area: residential buildings should not be less than 4.50m2; public buildings should not be less than 6.00m2;
When combined with the smoke staircase between the front room, its area: residential buildings should not be less than 6.00m2; public buildings should not be less than 10m2.
Smoke-resistant stairwells are staircases with smoke front and smoke-proof facilities separate from the use of space within the building. Its form generally has a closed front room or combined with the front room of the smoke staircase, with the balcony for the front room of the smoke staircase, with the floor for the front room of the smoke staircase and so on.
Closed stairwell is a staircase that separates refractory building blocks and prevents smoke and heat from entering.
If out to the outside, of course, do not need to do smoke staircase.
If leading to the indoor, single, basement floor less than 10M outdoor, to set up smoke staircase.
Other conditions of the basement, are required to set up closed staircase.
Smoke staircase front room and the front room should be set up measures to prevent smoke, that is, must have a mechanical pressure air supply device (that is, to maintain external positive pressure)
