| 摘要 |
PROBLEM TO BE SOLVED: To provide a shield machine in which the position of excavation can be changed during pipe jacking. SOLUTION: Pedestals 210-1, 210-2 as movable mounting sections, on which preceding bits 270-2, 270-3 are fixed one by one respectively, are fixed at the different apex sections of a link 200 on the front side of a cutter head 22. A jack 220 as a driving means driving the link 200 in the cross direction among the preceding bits 270 is forwarded and retracted, and the pedestals 210-1, 210-2 are moved simultaneously by the same movement section in a linkage manner. |
