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One minute to learn the stair installation skills

One minute to learn the stair installation skills

1. The slope of the stairs
    The determination of the slope of the stairs should take into account the comfort of walking, the efficiency of climbing and the state of space.
The line connecting each point of the step leading edge of the step is called the slope line. The angle between the slope line and the horizontal plane is the slope of the stairs (the tangent of this angle is called the gradient of the stairs). The slope of the indoor staircase is generally 20 degrees - 45 degrees, and the best slope is about 30 degrees. Stairs with special features require different slopes. For example, the slope of the ladder is above 60 degrees, the special stairs are generally 45 degrees to 60 degrees, the slopes of the indoor and outdoor steps are 14 degrees to 27 degrees, and the slope of the slope is usually below 15 degrees. Generally speaking, in places where the flow of people is large, the safety standards are high, or the area is relatively abundant, the stairs should be gentle. The auxiliary stairs are only used by a few people or used infrequently. The slope can be steeper, but it is better not to exceed 38. degree.
        
2, step size
    The size of the step should generally be adapted to the size of the human foot, and also related to the function of use in different types of buildings. The dimensions of the step include height and width. The ratio of step height to width is the gradient of the stairs. Steps can have different values ​​under the same slope, giving an appropriate range to make people feel comfortable walking. Practice has proved that the steps that are comfortable when walking are generally higher in height and larger in width. Therefore, when selecting the aspect ratio, it is better to use the two heights of the same slope as the height is smaller, because it is more labor-saving to walk than the height and width. However, it should be noted that the width should not be too small, not less than 240mm, so as to ensure that the center of gravity of the foot falls near the center of the foot, and 90% of the heel force point is on the step. For adults, the minimum width of the stair step should be 240mm, and the width of the comfort should be about 300mm. The height of the step should not be greater than 170mm-210mm, and the comfortable height is about 170mm-150mm.
For each step of the same staircase, the height and width of the step should be the same, and the size should not be irregularly changed to ensure a constant relationship between the slope and the stride.
       
3, the step width
     The width of the ladder is generally determined by the flow of the passer to ensure smooth passage. The width of a single-passage step should generally be 900mm; the width of a double-passage step should generally be 1100mm--1400mm; the width of a three-passenger step should generally be 1650-2100. If more people are in circulation, the width per person is increased by 550+ (0-150) mm. When the width of the step is greater than 1400mm, the wall handrail should generally be set, and when more than 4-5 people flow on the stairs, the middle handrail should be added.
      
4. Floor height
    Standard height and calculation formula of indoor stairs
    Cm 231-253252-276273-299294-322315-345
    Step number 10+1 11+1 12+1 13+1 14+1
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