Tunnel drilling apparatus and method to remove drill waste

Details Tunnel drilling apparatus and method to remove drill waste Tunnel drilling apparatus and method to remove drill waste

E - Fixed Constructions

21

D

E21D 9/08 (2006.01) E21B 7/06 (2006.01) E21B 7/20 (2006.01) E21D 9/10 (2006.01)

Patent

CA 2066051

2066051 9105141 PCTABS00004 A method provided with a working bit (1) for removing drill waste from drilling apparatus driving a tunnel in soil or rock, by means of which drill waste is conveyed by compressed air or water through openings (2) in the drill bit (1) and/or bit holder direct into the drilling apparatus protecting tubes (3, 7) which reach to the bit or bit holder and wherein a lap joint is provided between the protecting tube and the bit or the bit holder to prevent access of drill waste to the outside of the protecting tube.

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