FIELD: construction industry.
SUBSTANCE: invention refers to stair step which can be attached to free cantilever projection on some part of building, including e.g. on building wall or on post or spiral stairs located inside the building. Attachment device equipped with flanges with clamping mechanisms is provided for installing the step that consists of one or more glass layers. By means of the above clamping mechanisms which are actually bolts, step is retained in a clamped position between flanges.
EFFECT: reducing the stair's weight.
17 cl, 4 dwg
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