| 摘要 |
PURPOSE: To easily cut an obstacle such as a ferro-concrete pile, sheet pile, etc., by forming each cutter part installed in a cutter head from a movable cutter and stationary cutters in the form of sawteeth. CONSTITUTION: On the face plate 2a of a cutter head installed rotatably in the front of a shield body, the first and the second cutter part 11, 12 are installed as stretching in the diametric direction and the radial direction. Each cutter part 11, 12 is formed from three cutters 21, 22 in the form of sawteeth. A hydraulic cylinder is installed to reciprocate the central cutter 21 which is arranged movably. |
