Explain how a guy derrick is used in multistory construction.
What will be an ideal response?
One lifting device for multistory construction is a guy derrick. It consists of a mast, a boom that pivots at the base of the mast, hoisting tackle, and supporting guy lines. The guy derrick can lift itself to floors constructed above it. The hoisting operation is controlled by a power winch located on grade. As the derrick rises to higher levels, the winch remains on the ground. Since the derrick is mounted on the structural frame, the loading must be considered as the design is developed. When the frame is completed, the derrick is disassembled and lowered to the ground with smaller winches.
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What will be an ideal response?