helical stair

helical stair

A stair whose treads are wrapped around a helix: commonly called a spiral stair. See also: Stair

spiral stair, caracole, circular stair, cockle stair, corkscrew stair, spiral staircase

spiral stair
A flight of stairs, circular in plan, whose treads wind around a central newel. Also called a helical stair, solid newel stair.
References in periodicals archive ?
Advance PowerPack 2016 for Autodesk[R] Advance Steel 2016 adds a wealth of localized manufacturer profiles and default settings, as well as new tools for creating splines of complex helical stair stringers, tools for automatic creation of floor coverings to standard grating sizes, improvements to many of the existing tools with new functionality and strategically, the introduction of a bi-directional link with Autodesk[R] Advance Steel and Advance Workshop that allows users to retrieve and graphically display production data in real-time, which can be published to the cloud for access in the field.
Again, however, specifics of place have prevailed as the cruciform arrangement has been usefully colonised by exhibition designers Thomas Matthews and linked by A & M's dramatic helical stair, situated at the crossing point where the Thompson Equatorial telescope originally stood.
A gym, sauna, hydrotherapy bath and music room are located in adjacent modules, while an upper deck, reached via a helical stair rising through an atrium, has a tv lounge, library and office.
The two parts are linked by a helical stair that sweeps down in a supple curve from the new entrance hall that anchors the north edge of the exhibition space.
Spiralling up from the main hall, a helical stair leads to the various reading room levels.