Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Longitudinally extensible by flexible drive or hoist
Patent
1986-03-25
1987-09-29
Pate, III, William F.
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Longitudinally extensible by flexible drive or hoist
52115, 52648, 249 20, B06C 2362
Patent
active
046961356
ABSTRACT:
In the construction of tall concrete towers, a two part derrick is suspended by cables from the tower to the lower part of the derrick. The derrick is extended on hydraulic rams, raising its upper part and outside casting forms. A pulley system maintains a deck scaffold and inside forms at their original level during extension. Extension of the derrick slakens cables from the tower to the upper part of the derrick. These cables are disconnected from the tower and reconnected at a higher level. Outside forms are fixed, reinforcing steel set in place, and the derrick retracted, raising the deck scaffold and inside forms by the pulley system, and slacking the lower cables. The lower cables are disconnected from the tower and reconnected at a higher level. Inside forms are set and concrete is poured. The concrete sets and the procedure is repeated.
The deck scaffold comprises radiating wooden beams with endpieces. As tower diameter decreases due to taper at higher elevations, the endpieces are removed, the beams cut back, and the endpieces replaced on the new beam ends.
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Photographs of a derrick believed to be in existence in the summer of 1984.
Kallinger Franz
Killion Mark E.
Custodis-Cottrell, Inc.
Garvey Christopher B.
Pate III William F.
Smith Creighton
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