First, the number , location and form of stairs stairwell should meet the requirements for convenient and safe evacuation .
Second, the ladder clear width shall comply with the provisions of the fire code , the benches clear width for everyday use stairs major traffic characteristics should be used according to the building , generally based on the number of flow per share for the flow width 0.55 + (0 ~ 0.15) m is determined , abortion should not be less than two shares . Note : 0 ~ 0.15m for the flow of the body in the road swing , many of the public buildings should take place on the flow limit.
Third, when the bench to change direction , the minimum width of the platform ladder handrails shall not be less than clear width . When handling large objects need the right amount should be widened .
Four , stepping each ladder section should generally not more than 18 nor less than three should be .
Fifth, the clear height upper and lower part of the hallway landing at not less than 2m. Benches clear height of not less than 2.20m. Benches clear width of the stairs shall not be less than 1.10 meters . ( Residential design specifications ) . Note: The clear height of bench stepping from the front edge of the line ( including the lowest and highest level of stepping outside of the front edge of the line within the range 0.30m ) measured to the top of the straight edge of the vertical height between the lower projections .
Six , at least on one side of the staircase handrails , benches clear width of three strands should be handrails on both sides of abortion , abortion should be up to four additional shares of the center armrest .
Seven , interior stair handrail height measured from the leading edge line since stepping not less than 0.90m. When one side of the level by the stairwell railing over 0.50m long , the height of not less than 1m.
Eight , still the leading edge portion should have non-slip action.
Nine , when children often use the stairs ladder well clear width greater than 0.20m, security measures must be taken .
X. staircase height ratio should be in accordance with Table 4.2.1 . Property stepping maximum height 0.18 , the minimum width of 0.25. Kindergarten Primary staircase maximum height 0.15 , the minimum width of 0.26 . Cinemas, theaters , stadiums , shopping malls, hospitals, nursing homes and other stair treads , the maximum height of 0.16 , the minimum width of 0.28 . Other buildings stair treads , maximum height 0.17 , the minimum width of 0.26 . Residential indoor stairs, dedicated service staircase , the maximum height of 0.20 , the minimum width of 0.22 .
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