In today's construction, more attention is paid to the speed of construction, and the quality is underestimated, especially in the joints of staircase steel grid construction, common problems such as slag inclusion, wrong platform, and leaking ribs are widespread. The staircase is the first component of the building. It is the only way to disperse personnel in an urgent situation. Therefore, the quality of the steel grating of the
staircase directly affects the safety of personnel.
I. The number, width and distance of stairs should satisfy the requirements of convenient use and safe dispersion.
2. The steel grating
of the staircase shall comply with the fire protection code. The width of the staircase steps for general use shall be determined according to the building. It shall be determined according to the number of people with a flow rate of 0.55+ (0-0.15) m per share and shall not be less than Two people flow. 0-0.15m is the human body swing in the trek. If it is used in public places, the upper limit is required. At design time, the width of the stairs is calculated according to 0.55m per person flow, and the minimum width of the two flows should not be less than 1.10m. This is very practical for dispersing staircases, and for incomplete use of staircases for ordinary traffic, especially personnel Intensive public construction (because shopping malls, cinemas, and stadiums should consider multiple people's circulation), so that traffic does not form a congestion and congestion scene. In this case, the density of the flow of people is calculated as the minimum according to 0.55 meters. In fact, the human body has a certain swing and space in each other during the trek. Therefore, the flow of people per share is 0.55m + (0-0.15) m, and 0-0.15m is the flow of people The added value of many times, the width of the steel grating for a single person walking stairs should be appropriately increased.
3. When the ladder section changes direction, the minimum width of the channel at the end of the handrail turning cannot be less than the width of the ladder section, and it cannot be less than 1.2 meters. If it is a steel
staircase for a factory, the width needs to be appropriately added.
Fourth, the steps of each step cannot exceed 18 levels, nor can it be less than 3 levels.
5. The clear height of the upper part and lower part of the stairway can not be less than 2 meters, and the clear height of the steps should not be less than 2.2 meters.
6. At least one side of the staircase should be provided with handrails. If the net width of the staircase reaches three streams of people, handrails should be provided on both sides, and the center of the staircase should be provided with handrails.
7. The height of the handrail of the inner stairs should not be less than 0.90m from the front edge of the step. When the length of the horizontal handrail on the side of the stairwell exceeds 0.50m, its height should not be less than 1.05m.
Eight, the stair step board is recommended to choose the tooth shape for anti-slip, or the appearance plus the marking steel plate.