Hélicrab : technical manuel

6 1 Erection and dismantling using safe erection guard rail 5 Hélicrab: spiral worksite staircase E C H A F A U D A G E S • Fit the guard rail standard and 0.70 m safe erection guard rail and lock in place using a 0.70 m ledger on the landing. • Free the erection brace to fit the two 0.70 m x 0.30 m Panacier. • Remove the 1.17 m erection brace. • Fit the 0.70 m and 1.50 m toe boards. • Go back down to remove the erection platform. • Inspect the staircase and put the report in the “no entry” panel. Staircase attached to building. Straight exit. 10 11 Anchor at 2 m from the ground and then every 4 m as the tower is erected. See the Crab system manual for further details. Dismantling : dismantle the tower in the reverse order. Calculation notes are required for towers higher than 24 m. • Place the screw jacks on blocks. • Fit the basic standards and the normal and reinforced ledgers. • Level and fit the 3.00 m standards. • Fit four 1.50 m x 0.30 m • Fit three 1.72 m diagonal braces on the outside , and a 2.45 m diagonal brace on the outside . • Fit the anchors at 2 m above the ground then every 4 m. • Continue from step 3 . 1 2 Stair tower supported on a reinforced ledger for heights > 24 m Ensure that the reinforced ledger and the post are centred. Front access Left hand side access. Right hand side access. Access on three sides