Angled top approach to reinforced concrete cellar stairs - has top stringer recesses for bases of adjoining angled and parallel stringers

摘要

There is an angled access area in the top part of the cellar staircase, assembled from prefabricated reinforced concrete components, with sawtooth surface stringers, and fitting steps of angular sections. One outside side stringer (2) has a top bearing recess (6) for the bottom of a second stringer (7), adjoining it upwards at right angles. A top central recess (9) for the bottom of an inside stringer (10) is parallel to the first one. This in turn has a top central recess for the bottom of a second inside stringer (12) parallel to the second outside one. The design permits rapid and simple assembly of easily handled components, even in the absence of load-bearing external walls.