Technical regulation governing scaffold anchorage DIN 4420

Technical Details

(Extracts from DIN 4420)

Part 1, General provisions, edition March 2004
The anchorage may only be attached to solid, stable parts which cannot collapse, normally floor sheets or supports.

Only materials which have been proved in tests to transmit the required anchor forces in accordance with the existing anchorage base may be used for this purpose. Anchorages must be installed correctly. If netting or sheeting is applied to scaffolds or protective walls, for instance, additional anchorage is required in accordance with the structural analysis on account of the resultant higher wind stress.

Part 3, Scaffold constructions, excluding ladder and system scaffolds, edition dated January 2006 from section 6.4.4.2
The maximum anchor forces F⊥ and F|| (see Fig.) for the standard versions of scaffolds with tubular steel coupling as stationary scaffolds with longitudinally oriented scaffold layers are shown in Table in accordance with the anchoring pattern, type of scaffolding and scaffold height.

The specified forces must be compared with the permissible anchor loads and refer to systems with a spacing between uprights of l = 2.00 m and a coefficient C₁ = 0.76 (see DIN 4420 Part 1). If other distances between uprights are selected, the associated forces F⊥ and F|| may be determined from the values in Table by linear conversion. Anchorage of the canopy roof must be demonstrated with anchor forces F⊥ and F|| augmented by 50% for unlined scaffolds.

In the case of unlined scaffolds up to 10 m high, force FF|| may be disregarded when calculating the anchorage, provided that the external scaffold retainers are connected to the two uprights and the distance between inside edge of the scaffold board and building does not exceed 0.30 m.