Method of preparing subsurface and forming concrete column therein

Claim 1

A METHOD OF FORMING A CONCRETE COLUMN IN THE SOIL COMPRISING THE STEPS OF; DRILLING INTO THE SUBSURFACE WITH A DRILL BIT TO DRILL A BORE HOLE, INTRODUCING DRILLING LIQUID INCLUDING WATER INTO THE BORE HOLE DURING DRILLING TO MAINTAIN A LEVEL OF LIQUID FOR SUBSTANTALLY THE FULL DEPTH OF THE BORE HOLE AS IT IS DRILLED TO PREVENT COLLAPSE OF THE WALLS OF THE BORE HOLE, REMOVING SOME OF THE CUTTINGS MADE BY THE DRILL BIT DURING DRILLING TO REDUCE THE THICKNESS OF THE LIQUID IN THE BORE HOLE, THEREAFTER INTRODUCING CEMENT INTO THE LIQUID IN THE BORE HOLE SEPARATELY FROM THE DRILL BIT, THEREAFTER ROTATING AND LONGITUDINALLY RECIPROCATING THE DRILL BIT IN THE LIQUID TO THROUGHLY MIX THE CEMENT, WATER AND SOIL IN THE BORE HOLE, THEREAFTER REMOVING THE DRILL BIT FROM THE BORE HOLE TO ALLOW THE CEMENT, WATER AND SOIL TO HARDEN TO BECOME A HARDENED COLUMN IN THE SOIL, SUBSEQUENTLY DRILLING A BORE IN THE HARDENED COLUMN OF A SMALLER DIAMETER THAN THE HARDENED SO AS TO LEAVE AN ANNULAR WALL THICKNESS OF THE HARDENED COLUMN AROUND THE SMALLER DIAMETER BORE, AND THEREAFTER INTRODUCING CONCRETE INTO THE SMALLER DIAMETER BORE TO FORM A CONCRETE COLUMN THEREIN.

Claim 2

A METHOD OF FORMING A CONCRETE COLUMN IN THE SOIL COMPRISING THE STEPS OF; DRILLING INTO THE SUBSURFACE WITH A DRILL BIT TO DRILL A BORE HOLE, INTRODUCING DRILLING LIQUID INCLUDING WATER INTO THE BORE HOLE DURING DRILLING TO MAINTAIN A LEVEL OF LIQUID FOR SUBSTANTALLY THE FULL DEPTH OF THE BORE HOLE AS IT IS DRILLED TO PREVENT COLLAPSE OF THE WALLS OF THE BORE HOLE, REMOVING SOME OF THE CUTTINGS MADE BY THE DRILL BIT DURING DRILLING TO REDUCE THE THICKNESS OF THE LIQUID IN THE BORE HOLE, THEREAFTER INTRODUCING CEMENT INTO THE LIQUID IN THE BORE HOLE SEPARATELY FROM THE DRILL BIT, THEREAFTER ROTATING AND LONGITUDINALLY RECIPROCATING THE DRILL BIT IN THE LIQUID TO THROUGHLY MIX THE CEMENT, WATER AND SOIL IN THE BORE HOLE, THEREAFTER REMOVING THE DRILL BIT FROM THE BORE HOLE TO ALLOW THE CEMENT, WATER AND SOIL TO HARDEN TO BECOME A HARDENED COLUMN IN THE SOIL, SUBSEQUENTLY DRILLING A BORE IN THE HARDENED COLUMN OF A SMALLER DIAMETER THAN THE HARDENED SO AS TO LEAVE AN ANNULAR WALL THICKNESS OF THE HARDENED COLUMN AROUND THE SMALLER DIAMETER BORE, AND THEREAFTER INTRODUCING CONCRETE INTO THE SMALLER DIAMETER BORE TO FORM A CONCRETE COLUMN THEREIN.