spiral-stair
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spiral stair
Also called: helical stair, spiral staircase, winding stair
HB50
spiral stair
HB50
stair(way) with a circular plan, winding around a central column or post, and consisting entirely of wedge-shaped steps (winders)
See Figure A.31
See Figure A.31
In stone or precast concrete spiral stairs, the winders are laid on top of each other at the narrow end to form a solid, cylindrical column or pillar.
