Centerless concrete spiral stair -as built

Centerless concrete spiral stair -as built

jerry J.
This sprial staircase was designed in sketchup, and built by my son and myself in Mexico. It has a 10 ' diameter and a 134" rise over a little more than 360 degrees. A circular beam holds up the floor and landing. Completed pictures and construction details are in the instructable are in the url below #circular_stair #Mexico
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