Patent ID: 6439322
Filing Date: 2002-08-27
Classification: E21B

Abstract:
A core barrel having a working end for excavating ground in which substantially vertical foundation piles or secant wall piles are to be constructed, said core barrel comprising:a drive mechanism proximate a top end of said core barrel and adapted to receive a rotating kelly bar or top drive rotary; at least one core barrel wall defining a hollow interior of said core barrel; a plurality of hammer drills disposed proximate the perimeter of said core barrel, each of said hammer drills having a working end extending past said core barrel wall to cut a kerf larger in diameter than said core barrel; a plurality of air conduits, each of said air conduits connected to one of said plurality of hammer drills for delivering pressurized air thereto; and at least one high-pressure air vent formed in the top end of said core barrel for venting pressurized air from within said hollow interior.