May 12 this year is the 16th National Disaster Prevention and Mitigation Day, with the theme of "Everyone Stresses Safety, Everyone Knows How to Respond to Emergencies - Strive to Improve Grassroots Disaster Prevention and Risk Avoidance Capabilities". "May 11-17 is Disaster Prevention and Mitigation Awareness Week. During the Disaster Prevention and Mitigation Publicity Week, we will bring you a series of popular science knowledge about disaster prevention and mitigation, and strive to improve the public's ability to avoid emergencies and risks.
Today we will take you to learn how to prevent high-rise building fires? Let's learn together.
How to Prevent High-Rise Building Fires?
Recently
High-rise fire accidents occur from time to time
Once a high-rise building catches fire
The fire spread extremely quickly, and rescue was difficult
It is easy to cause huge loss of life and property
Let's learn together
High-level fire safety knowledge
What is a tall building
Residential buildings with a building height greater than 27m and
Non-single-storey factories with a building height of more than 24m
warehouses and other civil buildings
All belong to high-rise buildings
Why high-rise buildings catch fire
Its "lethality" is so great?
A brief look at three characteristics of this type of fire
01
Flammable and combustible external insulation materials
Flammable and combustible external insulation materials have become an important "accomplice" of high-rise building fires. Since 2005, the mainland has implemented the building energy conservation policy, and one of the main measures is to increase the insulation layer on the exterior wall, at that time, flammable and combustible materials such as polystyrene foam board or polyurethane rigid foam were mostly used, which were very easy to ignite and spread rapidly, and produced a large amount of toxic smoke after combustion, and the fire hazard was great.
02
The "Chimney Effect"
The "chimney effect" caused fires in high-rise buildings to spread rapidly. After a fire breaks out in a high-rise building, the smoke spreads vertically at a speed of 3-4m/s through stairwells, pipe wells, glass curtain wall gaps, etc., which can quickly ignite the entire building.
03
"The Wind Fuels the Fire"
"Wind-fueled fires" make fires in high-rise buildings difficult to control. It is determined that the wind speed is 5m/s at a height of 10m in the building; Wind speed at 30m altitude: 8.7m/s; Wind speed at 60m altitude: 12.3m/s; The wind speed at a height of 90m is 15m/s, because the wind speed is faster and faster the upward, after the fire occurs, there is often a situation where the wind helps the fire, and the fire borrows the wind to power, and the more it burns, the more vigorous it burns.
How to Prevent High-Rise Building Fires?
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