161 ACCESS STAIRCASES- TECHNICAL INFORMATION - 2023 STAIRCASES WORKSITE ACCESS TOWERS WITH LADDERS, STEPS OR STAIRCASES NF P 93-521 - May 2002 5.1.1. Angle of flight Staircase: 30° ≤ angle of inclination < 45°. Step ladder: 45° ≤ angle of inclination ≤ 50°. 5.1.2. Headroom Headroom must be at least 2.25 m. 5.1.3. Flight height Flight height H is limited to the height of 25 steps. 5.1.4. Steps Step run G and rise H must meet the following condition: 0.54 m ≤ R + 2 H ≤ 0.66 m. Step tread must be at least 0.125 m. The width of steps must be at least 0.55 m and no more than 0.75 m. The surface of the steps must be non-slip and allow rainwater run-off. For on-site installation, all these construction details being met, the height between the first step and the ground can be between 0.1 and 0.3 m. 5.1.5. Landings A landing must be at the same level as the highest step of the lower contiguous flight or can be this last step. The gap between the edge of the landing and the step must be ≥ 0.03 m. Landings must meet the following dimensional requirements: • continuous flights: - width of landing ≥ 0.6 m, - landing depth ≥ 1 m. • parallel flights: - width of passageway ≥ 0.6 m. - landing depth ≥ 0.6 m, • opposing flights: - depth of landing ≥ 0.6 m. 5.3. Rampant guardrails The height of the protection measured in relation to the nosing must be greater than or equal to 1 m. The space between rails must be less than or equal to 0.4 m. The height of the handrail must be between 0.9 m and 1.3 m from the nose of the steps. 6. Design basis and calculation specifications Access towers must be designed to be stable and fit for purpose. This includes their bearing capacity and stability against any lateral slippage, uplift or overturning. 6.1. Vertical working loads 6.1.1. Sizing circulation elements Flights of stairs and exit aisles (landings - circulating decks) must bear an evenly distributed load of 2 kN/m2. 6.1.2. Sizing structural elements To calculate the access tower's structure, the following working load must be considered: - 10 persons distributed uniformly on different levels, representing a load of 10 kN evenly distributed over the standards; - 10 persons concentrated near a row of standards, the standard subject to the greatest stress under permanent loads bears an additional load of 6.6 kN evenly distributed vertically. The loads considered in 6.1.1 and 6.1.2 are not cumulative. 6.4. Actions on guardrails Less than or equal to standard NF EN 12811-1. SITE STAIRCASES DESIGNED FOR PERSONNEL ACCESS AND EVACUATION NF P 93-522 - May 2002 5.1.1. Angle of flight Angle of between 30 and 38°. 5.1.2. Headroom Headroom must be at least 2.25 m. 5.1.3. Flight height Flight height H is limited to the height of 25 steps. 5.1.4. Steps Step run G and rise H must meet the following condition: 0.57 m ≤ R + 2 H ≤ 0.66 m. Step tread must be at least 0.15 m. Step width must be at least 0.75 m. The surface of the steps must be non-slip and allow rainwater run-off. For on-site installation, all these construction details being met, the height between the first step and the ground can be between 0.1 and 0.3 m. 5.1.5. Landings Dimensional requirements: • continuous flights: - depth of landing ≥ 1 m, • parallel or opposing flights: - depth of landing ≥ 0.9 or 1.4 m. 5.2 Requirements governing flights and exit aisles • Type A: 0.90 m • Type B: 1.40 m No projection at he bottom must reduce the width of flights of stairs and exit aisles. 5.3. Rampant guardrails The height of the protection measured in relation to the nosing must be greater than or equal to 1 m. The space between rails must be less than or equal to 0.4 m. The height of the handrail must be between 0.9 m and 1.3 m from the nosing. 6. Design basis and calculation specifications Worksite staircases must be designed to be stable and fit for purpose. This includes their bearing capacity and stability against any lateral slippage, uplift or overturning. 6.1. Vertical working loads 6.1.1. Sizing circulation elements Flights of stairs and exit aisles (landings - circulating decks) must, according to the class of the staircase, bear the following loads: • Type A: 3 kN/m2 • Type B: 4,5 kN/m2. For the flights, the surfaces to factor in are the horizontal projection surfaces, gaps included. 6.1.2. Sizing structural elements To calculate the staircase's structure, the following working load must be considered: • Type A (B): - 40 (90) persons distributed uniformly on different levels, representing a load of 40 (90) kN evenly distributed over all the standards; - 10 persons concentrated near a row of standards, the standard subject to the greatest stress under permanent loads bears an additional load of 6.6 kN evenly distributed vertically. The loads considered in 6.1.1 and 6.1.2 are not cumulative. 6.4. Actions on guardrails Less than or equal to standard NF EN 12811-1.
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