2、 There are no fire fighting facilities on the outer wall.
Does this kind of high-rise building exterior wall insulation material fire “smoke without injury”? This is obviously impossible! ▼▼▼ On June 14, 2017, a fire broke out in Glenfeld Apartment Building in London, England.
Experiments have proved that it only takes 30 seconds for a 30 storey building with a height of about 100 meters to smoke from the first floor to the top floor without blocking! In addition to the “chimney effect”, which rapidly accelerates the fire, the combustibility of external wall insulation materials is also a major reason for the billowing black smoke in high-rise building fires ▼▼▼ ▼ Since 1998, in order to achieve the goal of energy conservation, according to the national conditions, domestic buildings have begun to implement external wall insulation projects.
On the afternoon of September 16, the 218 meter high China Telecom Building in Changsha City, Hunan Province, caught fire at the scene of the fire.
But this fire, why did it burn so fast and smoke so much? The rapid fire spread of high-rise buildings is closely related to the “chimney effect” formed by the vertical plane ▼▼▼, which refers to the phenomenon that indoor air rises or falls along the space with vertical slope, causing the air to strengthen convection.
There are no fire fighting facilities on the outer wall, so it is impossible to deal with the fire at the first time.
After the fire, they used the “stay behind” strategy for a long time, did not realize the threat of fire spread, and did not evacuate the residents in the building in time, so that they missed the best evacuation time.
There may be a question in the minds of some netizens.
First, the burning speed is extremely fast.
In a fire, the plane burning speed is relatively slow, and the vertical burning speed is very fast.
All the building fire fighting facilities are installed inside.
For some high-rise buildings built before 2014, there is no regulation on how to prevent fire with external wall insulation materials.
Black smoke billowed into the sky and dozens of floors burned violently.
This time, the fire in Changsha China Telecom Building spread rapidly, and black smoke rushed into the sky, which attracted great attention from the network.
Besides organizing fire control in the direction of the exterior wall, the fire fighting and rescue forces should also carry out internal attacks to prevent the fire from spreading inward, and search and rescue and evacuate people inside the building.
In this fire, the commanders of the London Fire Department did not properly handle and respond.
Especially, the plane combustible in the vertical state catches fire, and the fire spreads rapidly.
In addition, the decoration of the building from 2014 to 2016 violated the relevant regulations, and the polyethylene material of the building facade coating led to the rapid spread of the fire.
In addition, it is risky to set up a position under the building.
Unfortunately, the fire prevention requirements for external wall insulation materials are relatively backward, It was not until the 2014 revised version of the Code for Fire Protection Design of Buildings that a special section on building insulation and exterior wall decoration was put forward, with 12 requirements, totaling 5 pages.
The following “three situations” must occur in case of fire of combustible thermal insulation or decorative materials on the exterior wall of the building.
The falling of combustibles on the exterior wall is likely to cause personal injury and damage to fire-fighting vehicles and equipment.
3、 The fire fighting and rescue personnel should face high risks.
Fortunately, the fire did not cause casualties (several stages of the fire in Changsha China Telecom Building).
Gather around and leave the scene as soon as possible to ensure your life safety!.
The fire eventually killed 71 people, including a fetus.
I remind you that if you encounter a fire like Changsha China Telecom Building in your life, don’t wait and see.