Support bolt staircase and bannister

摘要

The staircase comprises tread boards (12,) support bolts (14), and a two-bolt staircase interconnection on wall-side and wall-free ends. The wall anchoring of each tread board is provided by a fastener. The anchoring proper uses a statically carrying element, pref. a substitute wall stringboard, to which the tread board are secured. The stringboard is so high that it permits variable securing of the tread board fasteners in vertical and horizontal direction. Pref. the stringboard is of a single- or multi-section type. It may be also of three-dimensional support structure.