Safety evacuation ladder

They are necessary; otherwise, the protection requirements cannot be met. Here are two standards you can refer to to see this – the Fire Protection Code for the Design of Petrochemical Enterprises and the Fire Protection Code for Building Design

There are standards for fire protection codes in architectural design.

This post was last edited by Hou Xiaodi on 2010-3-11 at 14:14. There is no requirement to close it or to leave it open; it’s best to check the original specifications, as the decision depends on the specific circumstances. Regarding steel structure factories as mentioned by the original poster, I personally don’t think it’s necessary to have enclosed stairwells. High-rise factories, as well as factories of categories A, B, and C, present a high fire risk. In the event of a fire in a high-rise building, ordinary passenger or freight elevators lack measures such as smoke and fire protection, so they must be stopped from being used during a fire ； Ladder trucks and similar equipment can only be used specifically by firefighters during firefighting operations. People in the upper floors cannot rely on ordinary elevators or ladder trucks as the main means of evacuation; in such cases, stairs must be used as the primary route for evacuating people. Therefore, the fire protection systems in stairwells must be safe and reliable. The open stairwells in high-rise buildings act as a conduit for fire and smoke; during a fire, they allow smoke to spread rapidly upward through these stairwells and throughout the entire building, posing a threat to safe evacuation. At the same time, the flow of hot smoke also **accelerated the spread of the fire**. Therefore, requirements for the installation of enclosed stairwells and smoke-proof stairwells in high-rise factories are specified based on the fire hazard category and building height. Compared to residential buildings, industrial buildings generally have higher floor heights; for buildings with four or five floors, their height can reach 24 meters, and the conventional design for stairs is an open-type design. Taking into account that some factories are tall but have few employees, and contain little flammable decorative material in their structures, the requirements for installing smoke-proof stairwells have been adjusted; that is, for factories with a height of less than 32 meters and fewer than 10 employees, enclosed stairwells can be used. Additionally, when the factory building is open-plan, enclosed stairwells may not be necessary. However, if there are many people in the factory building, enclosed stairwells should be used to ensure the evacuation of personnel.