Prefabricated concrete structure

Claim 1

In a prefabricated, reinforced concrete structure, the combination of supporting columns each including a plurality of vertically aligned prefabricated concrete shafts, each of said shafts having a pocket in the upper end thereof, anchor rods embedded in the upper portion of each column shaft outside said pocket and protruding above said upper end of the shaft, steel members embedded in the lower portion of each column shaft and having extensions protruding downward into said pocket of the next lower vertically aligned shaft, concrete fill occupying each said pocket and in which the corresponding extensions are embedded, angle irons welded to said steel members of each column shaft and having horizontal flanges through which said anchor rods extend upwardly from the next lower vertically aligned shaft, fastening means securing the upper ends of the anchor rods to The corresponding horizontal flanges of said angle irons, horizontal concrete brackets integral with each said column shaft, each bracket having a shelf protruding from its outer end below the top of the bracket and also having an upwardly extending tongue on said end shelf, said tongue and the outer end of each bracket forming a groove extending transversely of the bracket, a prefabricated concrete girder extending horizontally from each bracket of each column to an opposing bracket of a remote column, the opposite end portions of each girder having downwardly extending tongues located in said grooves of the corresponding opposing brackets and also having transverse grooves receiving said upwardly extending tongues of the corresponding opposing brackets, said girders and brackets having ledges protruding from the opposite sides thereof below the tops thereof and also having tongues protruding upwardly from said ledges, said ledge tongues partly defining grooves extending along said ledges at opposite sides of the girders and brackets, and prefabricated concrete floor slabs having marginal portions resting on said ledges, the lower surfaces of said marginal portions having grooves receiving said ledge tongues and also having downwardly extending protrusions received in said ledge grooves.