| 摘要 |
<p>1,083,322. Tunnelling machines. MOTT, HAY & ANDERSON. March 17, 1965 [March 21, 1964], No. 12063/64. Heading E1F. To overcome cave-in problems when tunnelling through sand or like earth formations a liquid thixotropic suspension is delivered under pressure at the front of the shield of a tunnelling machine into contact with and to stabilise the face of the tunnel being formed by the machine and is then removed with spoil excavated by the digging mechanism associated with the shield.</p> |
