Technical information Crab range

L a y o u t s 1 1 Various types of base sections Verification It is important to check that F < p x S F = downward force on standard P = ground bearing capacity S = bearing surface area. If this is not case, the bearing area should be increased by using an additional support. In practice, wooden sole boards or baulks are often used for load spreading. The calculations should assume that the load is spread in a cone with an aperture angle of 90°. The baulks are frequently larger than the load spreading cone. If the baulk is larger than “a” in any direction, the dimension can still be used for calculating the bearing area provided that the dimension is less than or equal to L max where: Max. L ≤ A + 3 H Excessive Unleveled Resting on Resting on stacking ground a gap a hollow element of shims Prohibited layouts X X X X Spreading the load The ground or structure on which the scaffold will rest must be able the carry the loads. Load spreaders must be sufficiently rigid to be able to distribute the load over the whole bearing surface. Recommendations •Attach the supporting shims together and attach the baseplates to the shims with nails. •Always use a baseplate or footplate between each standard and the load spreader. •Where the scaffold will be erected on bare earth, this must be levelled and compacted. When a = plate width = 15 cm A = 2 H + a AB + BS Fork + DF Fork 700 kg castor wheel + BS 1500 kg castor wheel + BS 2000 kg castor wheel + BS AB Inclinacle AB + BS Inclinable AB AB: adjustable baseplate BS: basic standard The dimensions run from the centreline of the stirrup. Footplate + BS Footplate We recommend wherever possible to limit jack extensions to improve the strength and stability of scaffolding structures. Protective bearing pad: this non-slip polypropylene pad must on no account be used as a distribution wedge. to to to to to to 01.11.17 T e c h n i c a l i n f o r m a t i o n