DRILL BODY WITH AIR-HAMMER FOR INDUCING REVERSE CIRCULATION EFFECTIVELY AND DRILLING METHOD USING THE SAME

摘要

The invention relates to a drill body equipped at the front end of a rod in a drill with a reverse circulation inducing air hammer and a method of using the drill body, the drill being proposed to use compressed air used in driving air hammers for discharging drill cuttings. More particularly, the invention concerns a drill body with a reverse circulation inducing air hammer in which primary initial reverse circulation of compressed air is induced by supplying compressed air without being involved in driving the air hammer in advance before driving it thereby to form a flow of discharging drill cuttings, and a method of drilling a hole in a reverse circulation manner. The drill body with a reverse circulation inducing air hammer equipped at the front end of a rod of a drill according to the invention comprises an air hammer; a discharge pipe; a first air supply pipe to which compressed air is supplied for driving the air hammer; and a second air supply pipe to which compressed air is supplied to be discharged to the discharge pipe, the bit at the front end of the air hammer being formed with air discharge holes.