Tunnel boring machines

Details Tunnel boring machines Tunnel boring machines

E - Fixed Constructions

21

C

262/78

E21C 27/24 (2006.01) E21D 9/10 (2006.01) E21D 9/11 (2006.01)

Patent

CA 1051932

AN IMPROVEMENT IN THE TUNNEL BORING MACHINES Abstract of the Disclosure A machine for use in mechanlcal tunnel borlng of the rotating cutter head type. A grid is fixed to the cutter head and has a surface generally parallel to the theoretical boring surface. The grid is provided with a plurality of void spaces from which the autting tools of the cutter head protect slightly. The void spaces have a size corresponding to the desired optimum dimensions of the fragments of the material removed in the boring opening.

270733

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