Steel programme tape punch for circular loom - with two slabs, main and ring beams being partially cast at low level and hoisted into position before completion

摘要

Each shell comprises an upper and a lower slab, main beams and ring beams, together with brace frames for the upper and lower slabs. In the first phase, the lower part of the shell is erected in situ and approx. on the level (10) of the floor, perpendicular to the permanent position. This lower part comprises the lower slab (1), main beams (2), ring beams (3) and brace frames (4). In the second phase, this part is prestressed longitudinally, in the third phase, this part is hoisted to a height greater than the permanent height. In the fourth phase, the bearing columns are erected and once they have set, the lower part is lowered onto them (phase 5) and finally (phase 6), the upper slab is cast.