Patent ID: 8291675

Claim:
A modular pre-cast concrete construction system comprising: a plurality of pre-cast concrete floor caissons, each caisson comprising: a planar floor portion having a top surface and a bottom surface, walls extending from the bottom surface of the floor portion defining a hollow space, the walls each having an upper edge adjacent the floor portion and a lower edge spaced from the floor portion, a plurality of buttresses formed on each of the walls, a plurality of recesses formed in each of the walls, each recess formed between two buttresses, lower lips extending from the lower edge of each of the walls, upper lips extending from the upper edge of each of the walls spaced from the buttresses, the upper and lower lips of each caisson wall defining a space therebetween, the plurality of caissons placed adjacent one another to define a cavity between each adjacent caisson, the upper lips of adjacent caissons define an upper width of the cavity and the lower lips of adjacent caissons define a lower width of the cavity, the lower width wider than the upper width, a plurality of concrete beams located in the cavities and spaces formed by adjacent caissons, the concrete beams defining an upper surface and a lower surface, the top surfaces of the caissons and the upper surfaces of the concrete beams forming a planar floor, a plurality of pre-cast concrete wall panels, rebar located in each of the caissons, wall panels, and concrete beams, rebar extending between and within adjacent concrete beams, concrete wall columns formed between adjacent wall panels, the wall panels and wall columns supporting the planar floor, and rebar extending between and within the adjacent wall columns and concrete beams.