Spiral staircase tread slab support system - has slab ends on prefabricated reinforced concrete beams with screwed reinforced bars

摘要

The set of components is for use in an irregularly spirally-wound flight of stairs. One of the two ends of each tread slab rests on a beam (E, F, G), in the form of prefabricated reinforced-concrete girders, the ends of which are mounted in stair well components running parallel to the walls, (W). The tread slabs (1) are fitted with flat shaped bars serving as lengthways reinforcements. Two of these bars are screwed onto the beams with vertical screws. At the end of the flat bars on the inside of the spiral there are supports for further tread slabs. These supports may be propped in holes in the flat bards. Struts, pillars and balustrade bars can be added without difficulty.