**1****, ****The gradient of stair**

Stair gradient is decided really, should consider walk efficiency of comfortable, ascend and dimensional condition element.

Ladder paragraph the couplet route that various footfall leading edge chooses each calls gradient line. The gradient that the included angle of gradient line and horizontal is stair namely (the gradient that the tangent of this one included angle calls stair) . The gradient of indoor stair is 20 degrees commonly - 45 degrees advisable, best gradient is controlled for 30 degrees. The gradient that the stair of special function asks each are not identical. The slope that climbs ladder for example is in 60 degrees of above, special stair takes 45 degrees commonly - 60 degrees, the gradient of step of room inside and outside is 14 degrees - 27 degrees, the gradient of ramp is in 15 degrees normally the following. Say commonly, in stream of people bigger, safe level is higher, or the appropriate of spatial stair slope with ampler area is some gentlier, offer the auxiliary stairs that the small number of people is used or often does not use only, gradient is OK some steeper, but had better not exceed 38 degrees. **2****, footfall dimension**

The size of footfall is average should suit with photograph of step of person foot dimension, still build medium use function to concern with different type at the same time. The dimension of footfall includes height and width. Of footfall height and width than the gradient that is stair. Footfall is under same gradient is OK have different numerical value, give out an appropriate limits, when with making the person walks, feel comfortable. Carry out a proof, comfortable mark time feels when walking, it is height commonly relatively not and width is bigger. Because this is when choice aspect ratio, two kinds of dimension to same gradient with height lesser person advisable, because walk when than height and width great mark time wants save effort some. But should notice width also cannot pass small, with not be less than 240mm advisable, the exert oneself that can assure a foot so nods centre of gravity to fall around arch, make dot of calcaneal exert oneself has 90% to be on footfall. With respect to the adult character, the smallest width of stair footfall should be 240mm, comfortable width should be 300mm left and right sides. The height of footfall is unfavorable be more than 170mm, more comfortable height is 150mm left and right sides.

Each ladder of same stair paragraph, dimension of the height of its footfall, width should be identical, dimension is not due mobbish changes, in order to make sure gradient and step relation are constant. **3****, ladder Duan Kuan is spent**

Ladder Duan Kuan is spent be decided commonly by current stream of people, in order to assure current and smooth for the principle. Duan Kuan spends single person's current ladder to should be 900mm commonly; Duan Kuan spends the ladder with current two-men to should be 1100mm commonly- - 1400mm; Duan Kuan spends 3 people's current ladder to should be commonly 1650- - 2100. If more stream of people are current, increase 550 by every stream of people (0-150) the width of Mm. When ladder Duan Kuan is spent armrest relying on a wall should be set commonly when be more than 1400mm, and 4-5 person should exceed on stair should add commonly when stream of people set intermediate armrest.

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From; Author:Stand originally