ACCESS STAIRCASES - TECHNICAL INFORMATION - 2023 196 REGULATIONS / STANDARDS GOVERNING PUBLIC STAIRCASES Temporary metal staircases for public use NF P 93-523 - September 2002 5.4. Angle of flight Angle of between 30 and 38°. 5.5. Headroom Headroom must be at least 2.25 m. 5.6. Flight height Flight height H is limited to the height of 25 steps. 5.7. Steps Step run G and rise H must meet the following condition: G + 2H = 0.60 (+0.06 or - 0.03) m 0.25 m < G < 0.36 m 0.13 m < H < 0.17 m Step width must be at least 0.90 and limited to 4 exit units. 5.8. Landings Landings must meet the following requirements: • continuous flights: depth of landing ≥ 1 m. • parallel or opposing flights: landing depth identical to the width of the exit aisle. 5.9. Requirements concerning exit aisles One exit unit: clearance width 0.90 m. Two exit units: clearance width 1.40 m. More than two exit units: width in multiples of 0.60 m (per exit unit) and limited to 4 exit units. 5.12. Horizontal guardrails The height of the protection measured in relation to the landing must be greater than or equal to 1 m. For a landing less than 1.40 m deep, the guardrail facing the descent must be completed with a rail roughly 1.50 m above the level of the landing. 6 Design basis and calculation specifications Temporary metal staircases designed for public use 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 horizontal exit aisles must bear the following load: 6 kN/m2. For the flights, the surface areas to factor in are the horizontal projection surface areas. 6.1.2. Sizing structural elements To calculate the structure of the staircase, the working load to factor in is 3 kN/m2evenly distributed over all projected surfaces per level, corresponding to the least favourable case of 4 exit units. 6.2. Horizontal working loads The loads correspond to movements of the public and structural assembly defects. Inclusively we consider 6% of vertical working loads (paragraph 6.1.2) with the same distribution, in either the transverse or the longitudinal direction. Vertical and horizontal working loads act simultaneously. Circular dated 20 April 2009 on publicaccess buildings (appendix X - art. C3) Temporary scaffolding-type public staircases in prefabricated equipment, installed temporarily, the dimensions of which are compliant with those specified in standard NF P 93-523, is not required to meet regulatory requirements concerning the height and width of step runs. Fire safety regulation for public-access buildings (Ministry of the Interior – 7th edition, 1992) ARTICLE CO 35: design of exit aisles 1. The exit aisles must allow swift and safe evacuation of the establishment. In particular, it is prohibited to place one or two isolated steps in the main passageways. Differences in levels must be overcome either by gradients of no more than 10%, or by groups of at least three steps of equal size. 2. THERE must be a main passageway for each exit or on a protected exit aisle. Exceptions to this rule may be accepted subject to consulting the safety commission, when there is a sufficiently wide passageway around the room or the level. 3. Horizontal passageways at least of two exit units must run between exit aisles: - on the ground floor, staircases at the exits and between exits; - on upper floors and in basements, between staircases. However, the width of these passageways may be reduced to one unit when the connected exit aisles only offer one exit unit. On the ground floor, exits do not need to be interconnected if they lead to staircases leading outside. ARTICLE CO 36: exit units, width of passage 1. The minimum width of each exit aisle must be proportional to the total number of people liable to use it. 2. This width must be calculated on the basis of a standard width (called "exit unit”) of 0.60 m. However, when an exit aisle only has one or two exit units, the width is respectively increased from 0.60 m to 0.90 m and from 1.20 m to 1.40 m. When the width of an exit aisle is between the two standard widths calculated according to these provisions, this width only counts for the immediately smaller standard width. FROM 2 exit units, the provisions of article CO 37 allow projections of 0.10 m on each side in the regulatory width of exit aisles up to a height of 1.10 m. 3. Buildings, premises, levels, sectors or compartments with more than 200 people must not have normal exits narrower than two exit units. However, taking into account the layout of the premises, exit aisles of one exit unit are admissible, provided each one is only counted once: - either in the number of normal exit aisles - or in the number of exit units of these exit aisles.
RkJQdWJsaXNoZXIy OTQ2MzM=