| 摘要 |
A tunnel boring machine has a carriage which slides along a track. The carriage includes a spindle for attachment to a boring auger, and a power supply which drives the spindle and also drives an hydraulic ram which moves the carriage along the track. A device for locking the ram to the track is provided, and additional track sections may be added and locked to the original track. The auger casing is attached to arms which extend forwardly from the spindle housing, and a winch assembly is used in conjunction with the spindle for retracting auger sections from the bored tunnel without moving the carriage.
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