Tunnel boring machine

Details Tunnel boring machine Tunnel boring machine

B - Operations, Transporting

21

D

262/54

B21D 9/08 (2006.01) E21B 10/32 (2006.01) E21D 9/11 (2006.01)

Patent

CA 2020042

Abstract: Tunnel boring machine comprising a number of swingable arms (11,12,13,14) provided with boring tools (41,42,43,44) for the working of the tunnel wall outside its normal diameter. ut1890099

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