Tunnel boring machine
AssigneeAtlas Copco Construction and Mining Technique AB
InventorsJan H. Forsberg, Carl S. M. Hartwig, Nils M. Astrand
Life of this patent
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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. The arms may be swung outwardly into an active position or retracted into an inactive position. These tools may be independently actuated and facilitate the insertion of steel supporting arcs into the excavated area.
Claims4
Tunnel boring machine comprising a housing being fixedly positioned relative to a tunnel wall, with a boring head rotatably mounted relative to said housing, said boring head having an outer surface defining a periphery, said boring head being provided with a first plurality of boring tools on a front surface thereof for boring a tunnel in a direction forwardly of said boring head, and a motor for rotating the boring head, said tunnel boring machine further comprising a second plurality of boring tools and a plurality of arms mounted to the periphery of said boring head, each of said second plurality of boring tools being carried by a different one of said plurality of arms, and means operatively associated with said second plurality of arms for selectively and independently swinging each of said plurality of arms between a retracted inactive position in which said tool carried by said arm is proximate to said periphery of said boring head and an extended operating position in which said tool carried by said arms extends beyond said periphery of said boring head.
Dependencies are inferred from the claim text.