Building structure

Claim 1

IN A BUILDING CONSTRUCTION, THE COMBINATION COMPRISING A PLURALITY OF PRECAST, PRE-STRESSED, GENERALLY RECTANGULAR JOINED SLABS, EACH OF SAID SLABS INCLUDING A TOP, INTEGRAL DOWNWARDLY EXTENDING SPACED PARALLEL FLANGES AND INTEGRAL MARGINAL EXTENSIONS ALONG TWO EDGES THEREOF ADJACENT SAID FLANGES, SAID TOP AND PARALLEL FLANGES DEFINING AN ELONGATED CHANNEL, SAID MARGINAL EXTENSIONS EACH HAVING A TRANSVERSE DIMENSION EQUAL TO ONE-HALF THE TRANSVERSE DIMENSION OF SAID TOP, THE MARGINAL EXTENSIONS AND ADJACENT FLANGES OF ADJACENT JOINED SLABS EACH DEFINING A CHANNEL OF EQUAL DIMENSION TO THE DIMENSION OF THE CHANNEL DEFINED BY SAID TOP AND INTEGRAL SPACED PARALLEL FLANGE OF EACH SLAB, MEANS EXTENDING BETWEEN SAID ADJACENT FLANGES AND REMOVABLY SECURED THERETO TO ENCLOSE SAID CHANNELS, SAID LAST-MENTIONED MEANS INCLUDING BOTTOM PLATES HAVING UPTURNED FLANGES ALONG THEIR EDGES, SAID FLANGES HAVING OUTWARDLY AND THENCE INWARDLY EXTENDING TOP PORTIONS WITH REVERTED REINFORCING STRIPS DEPENDING FROM THE INWARDLY EXTENDING PORTIONS, PINS EXTENDING THROUGH SAID REINFORCING STRIPS AND UPTURNED FLANGES ENGAGED IN THE CONCRETE OF THE ADJACENT PARALLEL FLANGE OF THE SLAB, AND END CLOSURE MEANS INCLUDING A FLANGED END PLATE EXTENDING TRANSVERSELY ACROSS A CHANNEL AND MASTIC SEALING BEADS INTERPOSED BETWEEN THE ADJACENT CONCRETE FLANGES AND THE UNDERSIDE OF THE ADJACENT SLAB AND THE FLANGE OF THE END PLATE.