Mining or in situ disintegration of hard material – Hard material disintegrating machines – Stepper-type advance-causing means
Patent
1996-12-11
1999-04-06
Bagnell, David J.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Stepper-type advance-causing means
299 33, E21D 902, E21D 908
Patent
active
058907718
ABSTRACT:
A tunnel boring machine particularly adapted to operate at substantial depths below the earth's surface. The machine comprises a head section comprising a cutter head that is rotatably mounted to a support structure. There is a plurality of gripper shoes spaced circumferentially around the support structure, and these are operated to grip the tunnel wall and be selectively operated to advance the machine in the tunnel as the tunneling operation progresses. Also, there is a roof shield positioned immediately behind the cutter head. There is also a pair of support shoes supported from the support structure by links having curved bearing surfaces to maintain the machine at the proper distance above the tunnel invert. There is a beam structure having a forward end connected to the support structure by a universal connection, and the beam structure is supported by a rearwardly positioned gantry. There is also a positioning means to rotate the support structure relative to the beam structure so as to move the head section both laterally and vertically, and also to correct roll orientation.
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