Technical information Crab range

Needle beam 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. Anchor point There are 4 common types of anchor: Wall plugs Expanding anchors should be used whenever the type of wall and aesthetic restrictions allow. They are particularly recommended where there may be high sideways loads (e.g. wind loads on covered scaffolds). This enable the anchor to be positioned as close as possible to a node. The firmness of the wall plug depends on the building material. The maximum loads are specified by the suppliers. Anchoring systems other than wall plate tube clamps only take up tensile stress. For anchor ties bearing heavy loads or if the bearing surface is not very strong, an on-site test is recommended. Encircling Sometimes a tube and coupler arrangement can be used to lock the scaffolding to the structure by encircling or threading. A n c h o r s a n d a n c h o r t i e s 2 5 Jacking A tube with a screw jack is fitted into a recess, vertically or horizontally depending on the shorter direction and the greater strength of the recess. Place a 19 mm non- bakelized CTBX plywood board 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 tie tube must be as close as possible to one end of the jacked tube. Make sure the openings are at least 15 cm wide and are strong enough. Screw jack Part number Description Weight (kg) 101049-5 Screw jack 40/49 2.48 Part number Description Weight (kg) 021162-3 Anchoring strut 1.00 m 3.60 250008-0 Crab* anchor ring (1) (2) 0.20 010041-2 1.00 m galvanized tube with plate 4.74 011041-1 1.10 m galvanized tube with plate 5.10 015041-7 1.50 m galvanized tube with plate 6.58 020041-0 2.00 m galvanized tube with plate 8.42 025041-5 2.50 m galvanized tube with plate 10.26 030041-8 3.00 m galvanized tube with plate 12.10 036041-2 3.60 m galvanized tube with plate 14.30 Anchoring eyebolt * (1) Is used with M12 metal wall plugs or chemical anchor ties - (2) Is used with nylon wall plugs Ø14. 1.65 m maxi Tube with screw jack Non-bakelized exterior chipboard 150 x 150 x 19 mm Anchor 0.10 m maxi Use the appropriate coupler for the stress loading to take up. See tables on couplers page 39. Crab anchoring ring (1) Anchoring eyebolt Crab anchoring ring (2) 01.11.17 T e c h n i c a l i n f o r m a t i o n

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