Perhaps many people have seen the scene of the building catching fire, the scene is thick smoke, and the fire spreads from the fire floor to other floors. Smoke billowed throughout the building, and the flames soared into the sky, and in the process, broken incenum fell from the upper floor. I don't know if anyone who has thought of such a problem after seeing such a scene, it is reasonable to say that the building is made of concrete and steel, these things are non-combustible, why does the whole building burn after the fire?
This problem must start from the classification of building materials in China, building a high-rise building, generally need to use three types of substances, one is not combustible, the other is combustible, and there is a flame retardant material. The materials that cannot be burned in the construction of buildings are reinforced concrete, etc., and even if these materials encounter a fire, they will not catch fire in the air.
Unfortunately, it is not possible to build a building using only this one material, and every building is basically built with flame-retardant materials such as asphalt and plastic. This kind of thing will not burn itself out even if it encounters high temperatures, although when a fire occurs, we look at it burning, but in fact, as long as the source of the fire is removed, it will gradually eliminate the flame.
There is also a category of materials that are inevitable and very headaches, wood. This kind of material will burn itself as soon as it encounters a fire source, and even if the fire source is taken away, it will continue to burn into a new source of fire. So in the event of a fire, this type of material is the most difficult to deal with. At present, when building houses, we use this flammable material as little as possible.
However, none of the buildings were built to leave him empty, most of them were for use, so there were a lot of decoration materials and furniture inside. Most of these furniture are flammable items, so when a fire occurs, the facilities and furniture materials in the room will burn rapidly, which in turn will affect the entire building.
And most of the houses built now are considered to install insulation layers for warmth, which are also flammable items. Therefore, when a fire occurs, these insulation layers will also help the combustion of the entire floor to cause the rapid spread of fire. In addition, the number of floors of many buildings is now very high-rise, and the height is also very low, so the whole building is relatively densely populated. Where there are many people, there will be more items, so a large number of dense objects will also accelerate the spread of fire.
Not only that, most of the current high-rise buildings are installed with elevators, and the existence of these elevators will also have a relatively large impact on the fire protection of high-rise buildings. Because of the existence of elevators, the air in many spaces is circulating vertically. This allows the air at the top and bottom of the building to flow against each other, making the air flow more fluid.
This design is good in normal times, but when a fire occurs, it will have a bad negative impact. Because once the fire occurs, the convection of the entire air will be strengthened due to the convection at the top of the building and the bottom, which will make the entire building fire difficult to control.
<h1 class="pgc-h-arrow-right" data-track="13" >What should we do if we encounter a fire in a high-rise building one day? </h1>
In fact, in the case of fire in high-rise buildings, it is not impossible to solve. At present, many buildings are very advanced in design, and they have been equipped with very complete fire protection measures and escape routes when they are built. Therefore, when we encounter a fire, we must learn to use the fire extinguisher of the fire escape.
If the fire is too large to be extinguished, you can press the alarm device near the fire extinguisher to attract the attention of others, seek help from others, and if conditions permit, call the fire alarm in time.
Don't panic if you're stuck in a tall building, as most supertall buildings have a floor inside as a dedicated shelter floor. Therefore, when we encounter such dangers, we should maintain our composure, find a way to escape safely, and do not panic.