Spiral ring-type construction with a single spiral central stairwell

Abstract

A building comprises a plurality of multi-story building sectors, each building sector having a trapezoidal horizontal cross section and the building sectors forming a polygonal ring enclosing an inner courtyard, a staircase housing in the inner courtyard, a spiral staircase in the staircase housing, the staircase winding circularly in an upward direction, and connecting passages radiating from the staircase to respective ones of the stories of the building sectors at staggered vertical distances. Successive stories in the upwardly winding direction of the spiral staircase in adjacent ones of the building sectors are vertically staggered from each other by the same vertical distances as the connecting passages.

Dependencies are inferred from the claim text.