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 be determined according to the use characteristics of the building and the number of people per stream of 0.55+(0~0. 15)m, and should not be less than two. 0~0. 15m is the swing 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, in fact, the human body has a certain swing when traveling, and there is a gap between them. Therefore, this article stipulates that each person's flow is 0.55m+(0~0. 15)m, and 0~0. 15m is the added value when there are many people, and the width of single staircase needs to be appropriately increased, as shown in the figure.
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 m. When larger objects need to be transported, it should be widened appropriately.
4. The number of steps per 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 steps 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 should be provided with handrails on at least one side. When the clear width of stairs reaches three people, handrails should be provided on both sides. When it reaches four people, middle handrails should be added.
7. The height of the inner stair handrail should not be less than 0.90 meters away 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, step anti-skid measures should be taken.
9. When the clear width of stairs and stairwells in nurseries, kindergartens, primary and secondary schools and children's special activities places is greater than 0.20m, measures must be taken to prevent children from climbing. Stair railings should be of a structure that is not easy to climb. When vertical poles are used as railings, the clear distance between the rails should not be greater than 0.11m. ..