Dual direction pre-stressed pre-tensioned precast concrete slabs and process for same

A process for preparing a dual direction prestressed pre-tensioned slab of concrete in a casting bed having spaced aligned slots through side walls thereof, said process comprising:

• (A) laying out a series of spaced longitudinal pre-tensioning wires along a length of the casting bed, said length exceeding a first length of a cast to be made, with termini of each of the longitudinal pre-tensioning wires being accessible for pre-tensioning prior to the cast;
• (B) laying out a series of spaced transverse pre-tensioning wires at selected intervals along a second length of the cast to be made and disposed at least one of above, below, and above and below the longitudinal pre-tensioning wires, with termini of each of the transverse pre-tensioning wires extending through the slots of the two respective side walls of said casting bed;
• (C) pre-tensioning the longitudinal pre-tensioning wires;
• (D) pre-tensioning the transverse pre-tensioning wires;
• (E) pouring concrete into the casting bed so as to fill the casting bed with the concrete to an elevation that is higher than all of the longitudinal pre-tensioning wires and the transverse pre-tensioning wires;
• and
• (F) allowing the poured concrete to harden forming a slab of concrete with the longitudinal pre-tensioning wires and the transverse pre-tensioning wires (a) being bonded to the concrete and (b) extending outward from the slab longitudinally and transversely, respectively.