| 摘要 |
PURPOSE: Prefabricated circular stairs are provided to secure excellent quality by manufacturing the whole structural elements of a circular stair system beforehand in a factory, to carry easily by producing in a unit member, to reduce a term of works and manpower by assembling and installing simply without additional works, and to install at any time regardless of a working process in a construction site. CONSTITUTION: Prefabricated circular stairs comprise a central shaft(10) formed by the combination of shaft members(11a,11b), many stair-plates connected to the side of each shaft member, turning-angle controllers(13,14,19) controlling a turning-angle of the shaft member connected to one of the stair-plates and the shaft member located on the upper and lower parts to place one of the stair-plates by revolving around the stair-plates located on the upper and lower parts and the central shaft in an appointed angle, wherein the stair-plates are spirally located toward the central shaft.
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