Method of forming concrete piles in situ

Claim 1

METHOD OF FORMING CONCRETE PILES IN SITU COMPRISING THE STEPS OF: DRILLING A HOLE IN SANDY SOIL TO A PREDETERMINED FRACTION OF THE ULTIMATE PILE DEPTH AND REMOVING THE SOIL THEREFROM THIS HOLE CONSTITUTING A MIXING AREA; ADDING HYDRAULICALLY SETTABLE CEMENTITIOUS MATERIAL TO THE HOLE TO FORM A FLUID CONCRETE MIX WITH THE UNDERLYING SOIL; DRILLING TO A SLIDABLY LOWER DEPTH INTO THE UNDERLYING SOIL BY MEANS OF A ROTATING AUGER AND RAISING THE NEWLY DRILLED SOIL UPWARDLY AND MIXING THE NEWLY DRILLED SOIL WITH THE CEMENTITIOUS MATERIAL THEREABOVE BY RAISING THE ROTATING AUGER INTO THE MIXING AREA; REPEATING SAID DRILLING, RAISING AND MIXING STEPS IN A PROGRESSIVE OPERATION UNTIL THE PREDETERMINED DEPTH OF THE PILE IS REACHED, WHEREBY THE NEWLY DRILLED SOIL AND THE CEMENTITIOUS MATERIAL ARE UNIFORMLY MIXED THROUGHOUT THE ENTIRE DEPTH BY THE ROTATING AUGER, AND THEN REMOVING THE AUGER FROM THE FORMED CONCRETE PILE.