Method employed in deep hole drilling and a drill shaft system

Details Method employed in deep hole drilling and a drill shaft system Method employed in deep hole drilling and a drill shaft system

E - Fixed Constructions

21

B

255/89

E21B 10/60 (2006.01) E21B 17/00 (2006.01) E21B 17/042 (2006.01) E21B 21/00 (2006.01)

Patent

CA 1217761

ABSTRACT OF THE DISCLOSURE A method is disclosed for deep hole rock drilling in which the drilling shaft is made up of extension pieces joined together by a thread system. A central flushing channel is made in the extension pieces through which water or air is conveyed to the hole and with the aid of which the drilled material particles are carried out of the hole through the side flushing channel between the drill shaft and the wall of the drilled hole. In accordance with the invention the cross- sectional surface area of the drill shaft corresponding to the diameter of the hole to be drilled is selected in accord- ance with the power of the drilling machine to be used and thereafter the outside diameter and central flushing channel diameter of the tubular drill shaft are selected so that the cross-sectional surface area of the central flushing chamber is essentially equally large as the cross-sectional surface area of the side flushing channel. The drill shaft is tubular and is manufactured of steel tube such that the relationship of the inner diameter to the outer diameter is in the range 0.7..Ø9. The thread helix angle and form height of the threads of the screwed components of the tubular extension pieces are constants independent of the outside diameter of the tube, so that the threads pitch and number of thread starts increases with the increase in outside diameter of the tube.

442211

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