Patent ID: 7147197
Filing Date: 2006-12-12
Classification: E04B,E04C

Abstract:
1. A concrete building system including; a plurality of cast concrete joists, each of said joists including a length and a flat planar top surface; each of said joists including a groove on each side thereof, said groove being parallel and adjacent to said top planar surface, said building system including two walls and a space between said walls, each of said cast concrete joists spanning said space and resting on each of said walls; concrete forms sized to fit between two of said joists and means on each of said forms adapted to engage said groove to releaseably hold said concrete form in place between said joists, a concrete floor on top of said joists and forms such that the floor and the forms are supported on the two walls by the joists wherein the cast concrete joists include pre-tensioned reinforcement strands and wherein said means on each said form includes retractable tabs.