INCLINED JET DRILLING TOOL

摘要

A tool for drilling has a diameter D, teeth having a height H and carried by wheels, irrigation means adapted to deliver at least one irrigation fluid jet through a calibrated orifice, the centre of said jet at the outlet of the orifice being situated at a distance d from a plane perpendicular to the axis of the tool passing through the apex of the teeth viewed from the working face. According to the present invention, the magnitudes D, H and d are such that d >/= 1.8 H and 0.125 D < d < 0.185 D. Application to drilling into grounds.