| 摘要 |
<p>An apparatus for tunnelling through soft stratum comprises a body portion 60 having a plurality of cylindrical members 61 connected together, a head portion 40 connected to one of the cylindrical members 61 at one end thereof, a water-proof frame 50 disposed between the head portion 40 and the cylindrical member 61, a plurality of pneumatic cylinders 62 disposed between every two of the cylindrical members 61, and a plurality of grouting pipes 70 mounted at tail end of the body portion 60. <IMAGE></p> |
