Hélicrab : technical manuel

6 0 Specifications and load capacity 1 0 Hélicrab: spiral worksite staircase E C H A F A U D A G E S 700 min. (landing) 700 (landing) 710 (step) h = 200 33,7° g = 165 150 464 390 tread line Conformity EN 12811-1 NF P 93-521 Helicrab Slope 30° to 55° 30° to 45° 33.7° Rise ≥ 175 mm, ≤ 225 mm Not specified 200 mm Tread ≥ 165 mm ≥ 125 mm 185 mm Overlap - 25 ≤ a ≤ 55 mm Not specified 40 mm Step width ≥ 500 mm 550 ≤ width < 750 mm 710 mm Going 150 ≤ g < 175 mm Not specified 165 mm Step size (Blondel law) 2 x rise + going ≥ 540 mm, ≤ 660 mm 565 mm Non slip, self draining treads yes yes yes Headroom ≥ 1.90 m > 2.25 m 3.00 m Landing length Not specified ≥ 600 mm 700 mm Stair toe board No At least as high as the nosing Working load 1 kN/m² 2 kN/m² 2 kN/m² Handrail above floor > 950 mm > 950 mm 1365 mm Maximum gap between guard rails < 470 mm < 470 mm 464 mm Landing toe board ≥ 150 mm ≥ 150 mm 150 mm Standalone tower Bill of materials for a 4.00 m standard staircase Crab system components Hélicrab components Load rating - Load capacity to NF P 93-521 (Worksite access towers with ladders, steps or staircases) - The first anchors should be a 2 m above the ground then every 4 m. As Hélicrab components are used inside a Multicrab tower, the erection requirements and equipment specification are defined in the Crab system manual, e.g. - anchors every 4 m, - bracing, - component load ratings: - Ledgers, - Diagonal braces - Standards as a function of their free length. As Hélicrab is very flexible, you may contact the design office for further information or particular designs that you may require. 1.50 Anchored both sides 1.50 A landing should be included every 25 steps for resting A 0.20 m x 1.50 m Panacier, a 0.30 m x 1.50 m Panacier and a 1.17 m wind brace are required for erection. Crab system component weight = 334 kg Hélicrab component weight = 197 kg Cradle weight = 146 kg Total weight = 677 kg Code Description Weight Quantity 195549-1 Fixed baseplate screw jack 3.60 4 270010-2 Crabétai baseplate 2.14 1 240000-0 Basic standard 2.53 4 250101-3 1.00 m standard 5.32 1 250102-1 2.00 m standard 9.59 4 250103-9 3.00 m standard 12.66 4 250001-5 Sliding foot for Crab stairs 1.45 1 300009-8 S pin 0.08 9 250207-8 0.70 m ledger 2.53 1 250215-1 1.50 m ledger 4.63 12 252215-9 1.50 m Reinforced ledger 8.90 2 252015-3 Diag. brace 2.00 x 1.50 (2.45) 6.28 3 251015-4 Diag. brace 1.00 x 1.50 (1.72) 4.35 10 256070-4 0.70 m Multicrab guardrail 5.95 1 115021-8 Panacier 0.20 m x 1.50 m 9.23 1 107031-7 Panacier 0.30 m x 0.70 m 6.64 2 115031-7 Panacier 0.30 m x 1.50 m 10.24 4 257070-3 0.70 m steel toe board 1.04 1 257150-3 1.50 m steel toe board 2.28 1 N-C 200 x 200 x 20 block - 1 000001-8 Storage handling rack 50.00 1 Code Description Weight Quantity 250042-9 Two step flight 11.60 4 250043-7 Three step flight 15.80 4 250040-3 Guardrail standard 4.90 1 250045-2 1.50 m Hélicrab guardrail 9.66 7 250047-8 Erection trapdoor 15.30 1 000011-7 Hélicrab cradle 48.00 2