ACCESS STAIRCASES - TECHNICAL INFORMATION - 2023 214 TECHNICAL DATA 4-STANDARD CRABESCAL WORKSITE ACCESS TOWER WITH ALUMINIUM FLIGHT Comparison NF EN 12 811- 1 Class B NF P93- 521 Stairway CRABESCAL access tower 4-standard steel flight Angle of flight 30° to 55° 48° Rise 175 ≤ h ≤ 225 mm - 182 mm Tread ≥ 165 mm ≥ 125 mm 180 mm Overlap -25 ≤ to ≤ 55 mm - -15 ≤ to ≤ 55 mm Step width 500 mm min. 550 mm ≤ width < 750 mm 585 mm Step run ≥ 175 mm - 180 mm Step size (Blondel) 540 ≤ 2h + g ≤ 660 mm 544 mm Non slip, self draining steps yes yes Headroom ≥ 1,90 m > 2.25 m 4.00 m Landing depth - ≤ 0.60 m 0.61 m Lateral protection - rail, midrail and toe board rail, midrail and toe board Working load 100 daN/m² 200 daN/m² 200 daN/m² Rail/deck distance > 950 mm 1,016 mm Max. opening in the lateral protection < 470 mm 520 mm Toe board height ≥ 150 mm 150 mm 1.50 m or 2.00 m 3.00 m The dimensions of the anchor points depend on: •The geographical area where the structure is located, •The cladding on the structure (no cladding or equipped with nets or canvas cover). •The nature of the support. (see: manufacturer’s technical information for fasteners)
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