Stairs are an important part of buildings. It is arranged in the stairwell and consists of stair flight, platform and railing. The common stair plane forms include straight ladder, double ladder, multiple ladder, cross ladder, scissors ladder, etc. Single running stairs are very simple, suitable for buildings with low storey height; Double running stairs are very common, including double running straight up, double running zigzag, double running folding (parallel), etc., which are suitable for general civil and industrial buildings; Three running stairs have three fold type, T-shaped type, split type, etc., which are mostly used in public buildings; The scissor staircase system is composed of a pair of double running parallel stairs in opposite directions, or a pair of overlapping but disconnected single running straight stairs. The cross section is in the shape of scissors, which can pass through more people at the same time and save space; The spiral staircase is supported on the middle column with fan-shaped steps. Although it is not comfortable to walk, it saves space and is suitable for places with less people and infrequent use; Round, semicircle Curved staircase It is supported by curved beams or curved plates. The steps are slightly fan-shaped, with various patterns, lively shapes, and rich in decoration. It is suitable for public buildings.

A component in a building used for inter floor traffic. It is composed of steps, platforms and enclosures of continuous steps. Stairs are also required in high-rise buildings with elevators. Stairs are divided into ordinary stairs and special stairs. Ordinary staircases include reinforced concrete staircases, steel staircases and wood staircases, among which reinforced concrete staircases have many advantages in structural rigidity, fire resistance, cost, construction, modeling, etc., and are widely used. Special stairs mainly include safety ladder, fire ladder and escalator.

Hebei steel and wood stairs manufacturer Explain the basic requirements of stairs

The outdoor stairs are generally designed as 0.3m wide and 0.15m high. It is also convenient to use, and the width and height are regulated.

1、 The number, location and form of stairs shall meet the requirements of convenient use and safe evacuation.

2、 In addition to meeting the requirements of fire prevention specifications, the clear width of stairways for daily main traffic shall be determined according to the use characteristics of buildings, generally based on the number of passenger trains with a width of 0.55 ＋ (0 ～ 0.15) m per passenger stream, and shall not be less than two passenger streams.

Note: 0~0.15 m refers to the swing of human body when people flow on the road, and the upper limit value shall be taken for places with a large number of people flow in public buildings.

3、 When the flight changes direction, the small width of the zui at the handrail of the platform should not be less than the clear width of the flight. When it is necessary to carry large objects, it shall be widened appropriately.

4、 Generally, the steps of each flight shall not exceed 18 levels and shall not be less than 3 levels.

5、 The clear height at the upper and lower gangways of the landing shall not be less than 2m. The clear height of stair flight shall not be less than 2.20m.

Note: The clear height of the flight is the vertical height from the leading edge line of the step (including 0.30m outside the leading edge line of the first step of zui low and zui high) to the lower edge of the straight upper projection.

6、 Handrails shall be set at least on one side of the stairs. Handrails shall be set on both sides of the stairs when the net width of the stairs reaches three streams of people, and intermediate handrails shall be added when the net width of the stairs reaches four streams of people.

VII Indoor stairs The handrail height shall not be less than 0.8m measured from the front edge line of the step. When the horizontal handrail at the side close to the stairwell is more than 0.5m long, its height shall not be less than 0.9m.

8、 The front edge of the step should be provided with anti-skid measures.