Patent ID: 6109836
Filing Date: 2000-08-29
Classification: E02D,E21B

Abstract:
A method of consolidating soil comprising the steps of:A) drilling a hole by advancing downwardly through the soil a rotary percussive drill bit disposed at the end of a drill string;B) pressurizing hydraulic fluid at the ground surface and conducting the pressurized hydraulic fluid downwardly through the drill string during step A to actuate a down-the-hole hammer disposed above the drill bit for applying percussive impacts thereto;C) retracting the drill string upwardly while rotating the drill string; andD) pressurizing grout at the ground surface and conducting the pressurized grout downwardly through the drill string during step C and ejecting the pressurized grout laterally outwardly through a lateral opening in the drill string whereby the opening rotates with the drill string to produce a console of mixed soil and grout surrounding the hole.