79 MULTICRAB - TECHNICAL INFORMATION - 2023 MULTICRAB DESIGN RULES ANCHOR POINTS There are 4 common types of anchor points: FASTENING GIRDLING NEEDLE BEAM JACKING SPECIAL CASES Fastening should be used whenever the type of wall and aesthetic restrictions allow. It is also recommended where there are high bearing forces (e.g. wind loads on covered scaffolds). This enable the anchor to be positioned as close as possible to a node. The firmness of a fastener depends on the building material. The maximum loads for fasteners are specified by the suppliers. There are certain structures for which additional anchor points are required (A). Protective screens, overhangs, pedestrian passages and roofer protections for instance require anchor points on each section of the scaffolding level with the aforesaid fixtures. Fit anchor points at right angles to the forces exerted by lifting equipment. A Protective screens Overhangs Pedestrian passages Roofer protections A A A One can sometimes lock using wrenches or girdles with tubes and couplers around the existing parts of the scaffolded structure. This technique is generally used for circular peripheral scaffolds. The needle beams must be arranged all around the periphery and connected by a plane wind bracing device to take up the forces of the wind in all directions. The tube with a screw jack is fitted vertically or horizontally so as to be as short as possible and according to the best strength of the recess. Place a 19 mm non-bakelized CTBX plywood plank between the jack (or tube) and the brickwork. The tubes are cut to length so that the jack extends as little as possible and they must be cut if they are more than 1.50 m long. The anchor tube must be as close as possible to one of the ends of the jacked tube. 1.65 m max. Tube with screw jack Non-laminated exterior chipboard 150 x 150 x 19 mm Anchor 0.10 m max. Make sure the openings are at least 15 cm wide and are strong enough. A = Anchor points Anchoring other than with plate tube only take up tensile forces. For anchor points bearing heavy loads or if the bearing surface is not very strong, an on-site test is recommended.
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