OCR

No crushing or washing facilities were necessary or established in this area for required aggregate production. A screening plant was installed near the Smelter camp site and immediately adjacent to an abundant deposit of beach sand and gravel. Material was fed by dragline and/or bull-dosed to a scalping grizzly, screen graded, and belt-conveyed to trucks for haul to work areas. Total project aggregate production, all sizes considered hut excluding all railroad ballast manufactured. —— 399,100 CY. CONCRETE JOIST PLANT Thin section, poured concrete slabs supported by precast concrete joists was the design detail, selected for second floor and flat roof of all two-story housing units and the flat roofs of practically all single-story permanent project camps supporting facilities, The concrete joist plant at Incapuquio was placed in operation on May 9, 1957 to handle project casting requirements. Plant equipment consisted of a 1/2 CY Noebring concrete mixer, a Kirk and Blum Type "S" heavy duty vibrating table, required form sets, and an overhead monorail system supported on steel bents with 3-ton electric hoists to handle form sets from vibrating tabic to steam curing kiln and thence to form stripping and joist storage area. Jigs were field constructed for stirrup fabrication, and reinforcing bar was precut to scheduled joist length. During period of peak production, a work force of 32 men average 140 joists per 8 hour shift. The plant continued in full-trie operation through December 1958, casting a total of 27,400 joists in 8", 10" a 12" depth section of varying lengths and design strengths.