What are the characteristics of fire in high rise buildings

The characteristics of fires in high-rise buildings include rapid fire spread, difficulty in evacuation, and difficulty in extinguishing. High-rise buildings are a modern socio-economic, technological and cultural complexDue to the high floor, large volume, large number of personnel, and complex functions of high-rise buildings, and once a fire occurs, it is difficult to extinguish, and the losses are huge and the consequences are heavy. Therefore, in recent years, more and more attention has been paid to the fire characteristics of high-rise buildings and their fire hazards.

First, the fire spreads quickly.

Stairwells, elevator shafts, pipe shafts, air ducts, cable shafts and other vertical shafts of high-rise buildings, if the fire separation treatment is not good, when a fire occurs, it is like a towering chimney, which becomes a way for the rapid spread of fire, especially high-rise buildings such as high-end hotels, comprehensive buildings and libraries, office buildings, etc., generally indoor combustibles are more, once the first time, the combustion is fierce and spreads rapidly.

2. Difficulty in evacuation.

The characteristics of high-rise buildings: first, there are many floors, long vertical distance, and long evacuation time to the ground or other safe places; the second is the concentration of personnel; Third, when the fire occurs, due to the smooth air flow of each shaft, the fire and smoke spread upwards quickly, increasing the difficulty of evacuation, the fire department of some economically more developed cities in China has purchased a small number of climbing fire trucks, but most of the cities with high-rise buildings have not yet climbed fire trucks, and its height can not meet the needs of safe evacuation and fighting.

Third, it is difficult to save.

High-rise buildings are tens of meters high, even hundreds of meters, and it is quite difficult to extinguish fires from the outside. Generally, it should be based on self-rescue, that is, mainly rely on indoor fire-fighting facilities. However, due to the current economic and technical conditions in China, the fire protection facilities inside the high-rise building can not be very perfect, especially the second-class high-rise building is still mainly based on the fire hydrant system, therefore, the fire fighting of high-rise buildings often encounters great difficulties.

The characteristics of fire are mainly in four aspects: First, the fire spreads through many ways and the speed is fast.

Due to the functional needs of high-rise buildings, there are vertical tube shafts such as stairwells, elevator shafts, pipe shafts, cable shafts, exhaust ducts, and garbage chutes. These shafts generally run through a number or the entire floor, if the design does not consider the fire separation measures or the fire separation measures are not handled well, when a fire occurs, it is like a towering chimney, and the smoke becomes a way for the fire to spread rapidly.

Contributing to the rapid spread of fires in high-rise buildings is also the wind factor, as the saying goes, "wind fuels fire". The higher the building, the greater the wind speed. Wind energy can make fire sources that are not normally a threat very dangerous, or dramatically expand fires that may spread slightly.

The stronger the wind, the more severe it becomes. 2. Difficulty in safe evacuation.

The characteristics of high-rise buildings: First, there are many floors and long vertical evacuation distances. It takes a long time to evacuate to a safe place; Second, the people are relatively concentrated, and it is easy to be crowded during evacuation; Third, when a fire occurs, the smoke and fire spread quickly to the vertical, which brings difficulties to the safe evacuation, and the elevator that is usually used is stopped due to the lack of smoke and power outages.

Therefore, in the event of a fire, the safe evacuation of high-rise buildings mainly depends on the evacuation staircase, if the stairwell can not effectively prevent the smoke from invading people, the smoke will quickly fill the stairwell, thereby seriously hindering the safe evacuation of people and threatening the safety of people's lives. Third, it is difficult to save.

Fighting fires in high-rise buildings is mainly based on indoor fire water supply facilities. Due to the fire-fighting facilities.

The constraints of conditions often bring a lot of difficulties to the rescue work.

In addition, some high-rise buildings do not consider fire elevators.

Firefighters when fighting fires.

They had to rush to the high-rise building "fully armed", which not only consumed a lot of physical strength, but also "collided" with the people evacuated from top to bottom, delaying the fire-fighting plane, and if the stairs were blocked by fireworks, the firefighters could not rush up, and the firefighting work was even more difficult. Fourth, the function is complex, and there are many factors.

Generally speaking, high-rise buildings have complex internal functions, a variety of equipment, and high decoration standards, so the fire hazard is high and it is easy to cause disasters.

Explain the fire safety knowledge of high-rise buildings!

The high-rise building has the characteristics of fast fire spread and fast smoke propagation.