ACCESS STAIRCASES - TECHNICAL INFORMATION - 2023 210 TECHNICAL DATA HÉLICRAB HELICAL STAIRCASE Comparison NF EN 12 811- 1 NF P93- 521 HÉLICRAB access Angle of flight 30° to 55° 30° to 45° 33.7° Rise 175 ≤ h ≤ 225 mm - 200 mm Tread ≥ 165 mm ≥ 125 mm 185 mm Overlap -25 ≤ a ≤ 55 mm - 40 mm Step width ≥ 500 mm 550 mm ≤ width < 750 mm 710 mm Step run 150 ≤ g < 175 mm - 165 mm Step size (Blondel) 540 ≤ 2h + g ≤ 660 mm 565 mm Non slip, self draining steps yes yes yes Headroom ≥ 1.90 m > 2.25 m 3.00 m Landing depth - ≥ 600 mm 700 mm Stair toe board no At least as high as the nosing Working load 100 daN/m² 200 daN/m² 200 daN/m² Rail/deck distance > 950 mm > 950 mm 1,365 mm Max. opening in the side protection < 470 mm < 470 mm 464 mm Toe board height ≥ 150 mm ≥ 150 mm 150 mm 700 mini (palier) 700 (palier) 710 (marche) h = 200 33,7° g = 165 150 464 390 Ligne de foulée RECOMMENDATION A landing should be included every 25 steps for resting. landing landing step walking line
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