PRESENTATION - TECHNICAL INFORMATION - 2023 34 Verification It is important to check that F < p x S F: downward force on standard; p: ground bearing capacity and S: bearing surface area on the ground. If this is not case, the bearing area should be increased by using an additional support. In practice, wooden planks, wood beams or solid timber are often used for load spreading. The calculations should assume that the load is spread in a cone with an aperture angle of 90°. When a = plate width = 15 cm A = 2 H + a The wedge is frequently larger than the load spreading cone. If the wedge 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 INFORMATION RECOMMENDATIONS LOAD DISTRIBUTION - BEARING SURFACE For its stability, the scaffolding requires particular attention to be paid to the nature and resistance of the soil. The ground or structure on which the scaffold will rest must be able to carry the loads that the structure will place upon it. Load spreaders must be sufficiently rigid to be able to distribute the load over the whole bearing surface. RECOMMENDATIONS •Attach the wedges together and attach the baseplates to the wedges with nails. •Always use an adjustable baseplate or footplate between each standard and the load spreader. •Where the scaffold will be erected on natural ground, this must be levelled and compacted. Absolutely avoid bearing down on ground of which the content is not known (buried gas, water or electrical lines; manhole covers; electrical or communication chambers). In these particular cases, change the location of the scaffolding or increase the load spreading. Comply with the road dimensions, do not stress the movements of docks, barges or pontoons and give special attention to roofs (comply with the sealing of flat roofs, tiles or slates of sloped roofs). Bearing on concrete slab In general, a tower does not require any particular preparation when it bears on a concrete slab. If the surface is uneven, wooden planks should be used between the base and the concrete. It may be necessary to provide falsework under the lower levels if they are unable to take the vertical loads. Bearing on natural ground On natural ground, the load must be distributed appropriately, depending on the nature of the ground and the load. Excessive stacking of wedges Bearing over a gutter Bearing on hollow block
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