With the rapid development of the economy, the number of high-rise buildings in urban construction is rapidly increasing.
It is prohibited to occupy cable wells, pipeline wells, or stack debris in vertical pipe wells such as cable wells and pipeline wells.
3.
The chimney effect occurs in high-rise buildings where various pipes, such as ducts and shafts, are crisscrossed.
After investigation, it was found that debris in the lobby, hallway, and stairwell of Building 6 on the first floor of the community caught fire, and thick smoke spread along the hallway to the upper floors.
On December 1, 2022, a fire broke out in a high-rise residential building in Fengming Huafu Community, Weiyang District, Xi’an City.
Without obstruction, smoke can quickly spread to the top layer along the vertical pipe well, instantly forming a “three-dimensional fire scene” throughout the entire building.
Popularization: According to Article 20 of the Regulations on Fire Safety Management of High rise Civil Buildings, vertical tube wells and cable tray such as cable wells and pipe wells of high rise civil buildings should be fireproof blocked at each floor, and the inspection door of tube wells should be fireproof doors.
Difficulty in Evacuation: High rise residential buildings have long evacuation routes and relatively few evacuation exits, making it difficult for personnel to evacuate safely.
After preliminary investigation, it was found that the burning substances on site were debris piled up in the air conditioning unit and courtyard.
What is a high-rise building? Residential buildings with a building height greater than 27m and non single story factories, warehouses, and other civil buildings with a building height greater than 24m are all considered high-rise buildings.
These high-rise buildings are symbols of urban prosperity and civilization, but they also bring new risks to urban public fire safety.
One resident was unconscious during the fire and died after being sent to medical treatment.
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The hot air caused by fires on lower floors, due to its low density, constantly accumulates at the top of the building, creating another “fire scene” on the top of the building.
The rapid spread of smoke in vertical channels such as stairwells, elevator shafts, and cable shafts is prone to chimney effects, greatly increasing the spread speed of smoke; Smoke and hot air flow diffuse outward through various channels such as doors and windows, forming a pulling force that accelerates the spread of fire and smoke.
The time required for safe evacuation is relatively long, which can easily lead to group deaths and injuries such as trampling and suffocation
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The fire resulted in 5 deaths and 3 injuries.
On April 3, 2023, a fire broke out in the courtyard of Yijingyuan high-rise residential building in Dali Jufucheng Community, Jiangning District, Nanjing City.
How could a small cable well be so harmful? 1.
Due to the high temperature generated by fires, the difference in gas density is caused by the action of wind, resulting in the chimney effect.
