| 摘要 |
PROBLEM TO BE SOLVED: To improve agitation efficiency in shield excavation.SOLUTION: There is provided a shield machine 1 which takes excavation earth in a chamber 13 provided on a back side of a cutter 11 excavating the ground in the front of a main body 10, and agitates the excavation earth in the chamber 13. A partition wall 14 positioned in the main body 10 and on the back of the chamber 13 is equipped with a fixed agitation blade 17 which moves forward and backward. Further, the fixed agitation blade 17 is changeable in rotational angle. For excavation in contaminated soil, the fixed agitation blade 17 is pushed out into the chamber 13 from the front of the partition wall 14. Further, the fixed agitation blade 17 is sectioned in a triangular shape, and the fixed agitation blade 17 sectioned in the triangular shape is rotated to an angular position where agitation efficiency is superior while pushed out. Furthermore, for excavation in soil where improvement in agitation efficiency is unnecessary, the fixed agitation blade 17 is drawn back into the partition wall 14 from in the chamber 13. |
