1, the width of the stairs The total width of the stairs is calculated according to the number of floors of the building, the fire resistance rating and the number of users.
2. Determine the number of stairs and the flight width of each stair.
3. According to the house type, determine the height (h) and width (b) of the step, that is, determine the slope of the stairs.
4. According to the height of the building, calculate the step series (n) of each floor.
5. Determine the stair form according to the type of the house and the location of the stairs on the plane.
6. Determine the width and height of the platform.
7. Calculate the horizontal projection length L of the stair section and the minimum net size B of the stair depth.
8. Calculate the minimum net size of the stairwell compartment.
9, according to the provisions of the modular coordination standard, determine the axis size of stair width and depth.
10, draw the plan and section of stairs.
Stair size calculation
Taking parallel double-running stairs as an example, the calculation method of stair size is explained. According to the height h and the height h of the first step, the number of steps in each floor is determined, and n = h/h/h.
1, and determine the horizontal projection length l according to the step number n and the primary step width b, where L=(0.5N- 1)Xb.
2. Determine whether to set a stairwell. Children's stairwells should not be larger than 120mm.
3. Determine the ladder width a according to the clear width a of the stairwell bay and the width c of the stairwell, where a = (a-c)/2.
4. According to the width (D 1 ≥ a) of the intermediate platform d1,the width (D2 >: a) of the floor platform d2 and the horizontal projection length l of the flight steps. Check the clear length of the staircase, b, d 1+l+d2 = b; if it can't be met, you can adjust the L value (that is, you can adjust the B value).
For example, there are channels under the underlying platform:
Specification for the number and location of stairs
A building has at least two staircases, and the conditions for setting one staircase are as follows:
1, according to the Code for Fire Protection Design of Buildings (excluding hospitals, nursing homes, nurseries and kindergartens), the conditions for setting evacuation stairs are shown in the table;
2, nine floors and below, each floor construction area of not more than 500m2 tower residential;
3. Modular dormitory with a floor area of no more than 300m2 and no more than 30 people on each floor;
4, 18 floor and below, each floor does not exceed 8 households, the construction area does not exceed 650m2, and there are smoke-proof stairwells and fire elevator tower houses;
5. For public buildings with at least two evacuation stairs, if the top floor is partially raised, the number of floors above it shall not exceed two, and the area of each floor shall not exceed 200m2. When the total number of people does not exceed 50, stairs can be set up, but safety exits with straight roofs should be set up.
Stairs with concentrated evacuation and many evacuees should not be arranged around the elevator.
When there are more than two stairs in the building, they should be divided into primary and secondary stairs, and the plane position should be reasonably arranged according to the traffic volume and the need of convenient evacuation. There should be a main staircase at the obvious position of the main entrance.
Stairwells should be located at the same location on each floor to facilitate use and emergency evacuation, rather than wasting area due to displacement. There must be direct contact when dislocation is needed in special circumstances, and it is not allowed to have harmful effects on emergency evacuation due to search and inconvenience.
Except for the staggered staircase leading to the refuge floor, the location of the evacuation stairwell on each floor of the high-rise building should not be changed, and the first floor should have an exit directly leading to the outdoor.
The stairwell on the first floor should be provided with a direct external exit; When the number of floors does not exceed four, the external exit can be set at a distance of no more than 15m from the stairwell.
The stairwell of basement and semi-basement should be separated from other parts by the partition wall with the first floor fire resistance of not less than 2.00h, and should be directly connected with the outdoor; When it is necessary to open the door on the partition wall, a fire door not lower than Grade B should be adopted.
The basement or semi-basement and the ground floor should not use stairwells; When stairwells must be used, the first floor and underground or semi-underground entrances and exits shall be provided with partition walls with fire resistance not less than 2.00h, separated from Class B fire doors, and shall be clearly marked.
Stair width specified in the specification
Code for fire protection design of buildings:
The respective total widths of evacuation walkways, emergency exits, evacuation stairs and room evacuation doors in buildings shall be determined by calculation. The clear width of emergency exits and room evacuation doors should not be less than 0.9m, and the clear width of evacuation walkways and stairs should not be less than1.1m;
The clear width of residential stair section should not be less than 1. 10m. For residential buildings with no more than six floors, the clear width of stairs with railings on one side should not be less than1m.
Code for fire protection of high-rise buildings
Code for fire protection of buildings-100-person evacuation index regulation
Rules for standardizing railings
residential design specification
Code for architectural design of primary and secondary schools
General rules for civil buildings
When the clear width of stairs and stairwells in nurseries, kindergartens, primary and secondary schools and children's special activity 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.
The safe evacuation distance of civil buildings shall meet the following requirements
1. When the room is located between two stairwells, the distance from the evacuation door of the room directly leading to the evacuation walkway to the nearest unsealed stairwell shall be reduced by 5m as specified in the table; When the room is located on both sides or at the end of the bag-shaped walkway, it should be reduced by 2 m as specified in the table;
2. The stairwell on the first floor should be provided with a direct outdoor exit or an enlarged closed stairwell on the first floor. When the number of floors does not exceed 4, a safety exit directly leading to the outside can be set at a place less than or equal to 15m from the stairwell;
For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd