Stairs can be divided into single running stairs, double running stairs and multiple running stairs according to the steps. The planar shape of the step has a straight line, a broken line and a curved line.
Single-run stairs are the simplest, suitable for buildings with lower floor heights; double-run stairs are the most common, with double running straight, double running twists, double running double folding (parallel), etc., suitable for general civil and industrial buildings; three running stairs There are three-fold, T-shaped, split-type, etc., which are mostly used in public buildings; the scissor stairway is composed of a pair of parallel running parallel ladders, or a pair of overlapping and unconnected single-run straight ladders. The cross-shaped scissors shape can pass more people and save space at the same time; the spiral-turning ladder is supported by the fan-shaped step on the neutral column. Although the walking is not comfortable, it saves space and is suitable for places with less people flow and infrequent use; Round, semi-circular, curved staircase, supported by curved beams or curved plates, slightly fanned, with a variety of styles, lively and decorative, suitable for public buildings.
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