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In recent years, with the expansion of commercial building area, the problems in evacuation design have become increasingly apparent, among which the long evacuation distance on the first floor and the inability of evacuation stairwells to go directly to the outside are common problems. In order to ensure that people can quickly evacuate to a safe area in case of fire, the evacuation distance is generally stipulated as 30m in the Code for Fire Protection Design. In order to prevent people on other floors from being affected by the fire when a fire breaks out on the first floor of a building, the code requires that the evacuation stairwell should have an exit directly leading to the outside on the first floor. However, the expansion of the building area poses a great challenge to meet the above two requirements at the same time. In large-scale commercial buildings, if the evacuation distance of the floors above the first floor meets the requirements of the code, some stairs on the first floor will inevitably be unable to go straight to the outside; On the other hand, if all the stairs can go directly to the outside, some floors will be too long to be evacuated. Safe passage can solve the common evacuation design problems of commercial buildings, such as long evacuation distance, the first floor of evacuation stairwell is not directly outside, etc.

The role of safe passage

According to the design principle of safe evacuation route, it is safer step by step and safer step by step when people are evacuated.

It is considered that the appropriate method is to set up a safe passage between the evacuation stairwell and the outdoor safety area for evacuation in emergency. In case of fire, people in the area with long evacuation distance can enter the safe passage first, and then evacuate from the safe passage; People evacuated from upstairs to the first floor can also be safely evacuated to the outside through the safe passage.