| 摘要 |
<p>A ground cutting device which may be used within a ground support shield (16) or supported from permanent ground support means, has one or more cutting tools (13) each mounted on an arm (6) capable of being manipulated by mechanical means (8, 10) in relation to a carrier plate (4). The plate is supported on a base unit 2 so that it can move axially and rotate. Bracing arms (1) suspend the plate (4) and its tools thus to be capable of automatic excavation without human intervention. The device is compact and portable thus to be readily deployed at a cutting face. If required means (17, 19, 20) Fig 3 may be provided to enable the device to be advanced mechanically as excavation proceeds and the device is configured and constructed to enable easy removal of spoil from the invert adjacent the cut face.</p> |
