The challenge was significant: A spiral staircase in architectural concrete, with a broad, curved landing three steps up and a larger boat-shaped landing halfway to the second floor. Monolithic sidewalls supporting a polished brass handrail end in scrolling curves with a 1-foot radius. With a skylight above and overhanging cast-in-place planter boxes at the upper landing level, the stairway is planned as the dramatic focal point of a new public library. This article details some of the five months of forming and placing operations required for successful completion of the stairs.
Source: Building A Concrete Spiral Stairway | ConcreteConstruction