Design code for six floors and below: In general stair design, the clear width of stair section should not be less than1.10m. For residential buildings with six floors or below, the width of the railing step on one side of the stairs should not be less than 1 m. It is worth noting that the clear width of the stair section is the horizontal distance from the wall to the center of the handrail, and the width of the stair step should not be less than 0.26 million. The height of steps should not be less than 0.175m ... the height of handrails should be less than 0.9m..

When stairwells are designed for residential buildings with seven floors or above, elevators must be installed for residential buildings with outdoor design height above the ground exceeding 16m. Note that when the height of the entrance floor is higher than the outdoor design floor of the building 16m, the multi-storey residential building with shops or other rooms on the ground floor must be equipped with elevators.

Extended data:

Precautions:

1. In order to avoid illusion when going up and down stairs, the heights of the first step and the last step of stairs should be consistent with other steps. If replacement is needed, it should be controlled within 4 cm, preferably not more than 2 cm ~3 cm.

2. The height from the top step of stairs to the ceiling requires a clearance of more than two meters, and the minimum clearance is not less than 1.8 meters. Otherwise, it will feel oppressive.

3. Distance between railings: The center distance between two railings should be 8 cm, and not more than 12.5 cm to prevent children from sticking their heads out of the gap.

4. Height of handrails: 85 ~ 90cm from waist, with a diameter of 5cm.

5. Height and depth of step: the height of step should be 15~ 18 cm, and the depth of step surface should be 22~27 cm. The sequence is about 15 steps. If it is too high, it may be necessary to set up a stair rest platform.

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