STAIRCASE IN VERTICAL SHAFT AND METHOD FOR CONSTRUCTING THE SAME

PROBLEM TO BE SOLVED: To enhance productivity and to reduce the period of construction work and the cost of construction work. SOLUTION: A plurality of unit cylindrical bodies 1 fabricated in a factory or workshop outside a vertical shaft and made of concrete, having about equal cross-sectional shapes and each having a plurality of first joint parts and a plurality of second joint parts located respectively on its upper and lower end faces, are piled up on a base 80 provided in the bottom of the vertical shaft, in such a manner that hollow parts continue with one another. The two vertically overlapping unit cylindrical bodies 1, 1 are coupled together by the first joint part of the lower unit cylindrical body 1 and the second joint part of the upper unit cylindrical body 1.