Four Million Square Feet of Thin-Shell Rib Panels for Roof Framing
Charles C. Zollman
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A detailed description of the required plant and the job planning for producing large numbers of ident,ical precast concrete roof elements. These elements were used in 17 warehouses each 200 x 1000 ft. The initial contract required the production of 144 panels per day with a later additional contract calling for 132 panels per day. Successive casting yard operations were release of side forms on previously cast panels; stripping and storing panels, cleaning molds; placing preassembled reinforcing cages; placing approximately 95 cu yd of concrete; vibrating, screeding, vacuum processing, and finishing of the concrete; curing; removal of spilled concrete; and washing and cleaning of vacuum mats and other equipment. So effective was the prior planning and the setting up and operation of the casting yard that the only important interruptions to production were when the construction of cast-in-place rigid frames could not keep up to the supply of panels.