Standard internal stairs

Figure 7.2b Vernacular escape stairs in USA

Internal Metal Round Stairs
Figure 7.2c Typical tubular framing to support landings of dog-leg stairs, offices at Stockley Park, 1989, Architects: Arup Associates

Fabrication methods devised for external stairs can be applied to internal stairs as with the Technical High School, Basle (Figure 7.2d). Open grid and chequer plate stairs are also used for industrial work. A higher standard of finish can be accommodated within metal trays or else laid on sheet steel formwork. The generic term is a 'folded sheet stair' welded to plate or tubular strings. It is this type of industrialized steel stair that is widely adopted in commercial buildings, particularly with steel frame construction. The advantages are linked to 'fast track' methods where the skeletal frame and stairs are erected in advance of floors and envelope walls, the folded sheet stair, even as formwork, provides access for the buildings without the need for scaffolding towers. The pattern depends upon the finishes to be applied ultimately on site; Figures 7.3a-c depict the selection offered by fabricators and the range of finishes which can be achieved.

Individual trays can be fitted just before handover to save wear and tear in construction and can be used with stairs framed in timber or pre-cast concrete (Figure 1.3 d).

Figure 7.2d Typical RSJ framing: escape stairs, Tecbnical Higb Scbool, Basle, 1931, Arcbitect: Otto Salvisberg (from Scbuster, F., Treppen, Hoffman Verlag, 1949)
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