Concrete construction: Formwork and other temporary support for cast in place (CIP) reinforced concrete structure for multi-story multi-unit residential building in Los Angeles, a quite active seismic zone. The formwork is for the 7th floor flat plate slab and the 8th floor columns. Column forms are the vertical wood rectangular forms, with steel outside horizontal, spaced support brackets. These forms surround the column steel reinforcing, erected as steel cages. The slab formwork is plyform sheathing to support the concrete, metal horizontal joists to support the sheathing, galvanized steel shoring trusses, with screw jacks at base, spaced to support joists. The concrete slabs and columns for the floors below the 7th floor were formed in the same way. Reinforcing steel was placed after the forms are in place, followed by concrete placement. After concrete hardened perhaps a week, the forms are removed to be used for the floor above. Thus, this is about the 7th time these slab forms have been used on this building. The vertical shores under floors 4, 5, and 6 are reshores to distribute the 7th floor concrete construction loads to floors 3, 4, and 5. Thus the shores under the 7th floor transfer the weight of 7th floor concrete and workers to the 6th floor still young concrete slab and and the reshoring distributes most of that load down further to the 5th, 4th, and 3rd floor slabs and columns. Therefore, as slab forms are dismantled, vertical shores are placed to help support the coming floors above. The deep yellow trussed tower on right side is the tower for the tower crane that serves the entire site, with ladders/stairs for the crane operator to ascend and descend to the cockpit cab above. Wilshire Blvd, Westwood, Los Angeles, CA, 2004.
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