1, Code for Design of Stairs in Civil Buildings:

1) The number, location, width and stairwell form of stairs should meet the requirements of convenient use and safe evacuation.

2) The horizontal distance from the wall to the center line of the handrail or the center line of the handrail, that is, the width of the stair flight, should not only comply with the provisions of the fire protection code, but also be determined according to the use characteristics of the building and the number of people in each stream of 0.55+(0-0. 15)m, which should not be less than two people. 0-0. 15m is the posture of human body during exercise, and the upper limit should be taken in crowded places in public buildings.

Explain in the general design rules:

In the code for fire protection, the width of stair flight is 0.55m for each pedestrian flow, and the small width of two pedestrian flows is not less than 1. 10m, which is suitable for evacuation stairs, but not completely suitable for stairs used for traffic at ordinary times, especially the main stairs of public buildings with dense crowds (such as shopping malls, theaters, gymnasiums, etc.). ), so it is necessary to consider multiple people passing through, so that vertical traffic will not cause congestion and congestion. In this way, the width of people flow is a small value calculated by 0.55m m. In fact, the human body has a certain swing and a gap between them when traveling. Therefore, this article stipulates that the flow per person is 0.55m+(0-0. 15)m, and when there are many people, 0-0. 15m is the added value. The width of the stairs for a single person needs to be appropriately increased.

3) When the steps change direction, the small width of the platform at the turning end of the handrail should not be less than the width of the steps, and should not be less than1.20m. When large objects need to be transported, it should be widened appropriately.

4) The step distance of each flight should not exceed 18 and should not be less than 3.

5) The clear height of the upper and lower aisles of the landing should not be less than 2m, and the clear height of the landing should not be less than 2.20m

Note: The clear height of the step is the vertical height measured from the front edge of the step (including within 0.30m from the front edge of the first step) to the lower edge of the upper protrusion.

6) Stairs shall be provided with handrails on at least one side. When the clear width of stairs reaches three people, handrails shall be provided on both sides. When it reaches four people, middle handrails shall be added.

7) The height of the inner stair handrail should not be less than 0.90m from the front line of the steps. When the length of the horizontal handrail near the stairwell exceeds 0.50m, its height should not be less than1.05m.

8) Anti-skid measures should be taken when stepping.

9) When the clear width of stairs and stairwells in nurseries, kindergartens, primary and secondary schools and children's special activities places is less than 0.20m, measures must be taken to prevent children from climbing and sliding. Stair handrails should adopt structures that are not easy to climb. When vertical poles are used as railings, the clear distance between bars should not be greater than 0.11m.

2, high-rise building stairs design standards and specifications:

For those with more than eighteen floors, each unit is provided with an evacuation staircase leading to the roof, and the stairs of adjacent units with more than eighteen floors are connected by balconies or recessed corridors (the roofs may not be connected). Firewalls are installed between some units on the 18th floor and below, and the doors are Class A fire doors. The width of the window wall and the height of the windowsill wall are greater than 1.2m, which is a unit house with incombustible walls.

Each unit on 18 floor and below is provided with evacuation stairs leading to the roof, and the stairs between units are connected through the roof. Firewalls are installed between units, and the doors are Class A fire doors. The width of the window wall and the height of the sill wall are greater than 1.2m, and it is a unit residence without burning body wall.

Outdoor stairs can be used as auxiliary smoke-proof stairs, and their small clear width should not be less than 0.90m m. When the inclination angle is not more than 450. When the height of handrails is not less than 1. 10m, the width of outdoor stairs can be included in the total width of evacuation stairs. Outdoor stairs and platforms at the exit of each floor should be made of incombustible materials. The fire resistance limit of the platform should not be lower than1.00h. No other doors, windows and holes should be opened on the wall within 2.00m around the stairs except the evacuation door. Evacuation doors should be Class B fire doors and should not face the stairs.