| 摘要 |
PURPOSE:To sufficiently agitate the excavated earth, using a sub-agitation rod by expanding a telescopic member on the operation of a telescopic jack, when a rotating position detecting device finds that the telescopic member comes to such a position as corresponding to the excavation section of an extra-excavation device. CONSTITUTION:A cutter arm 12 is rotated on the operation of a drive device 14, thereby performing an excavation process and driving an agitation rod 18 for the agitation of the excavated earth in a chamber. Also, the rotation angle of the arm 12 is detected with a rotation detector 15, and at the preset angle position thereof, a swing cutter 20 is oscillated by the preset amount on the operation of a swing jack 21, thereby performing an extra excavation process. At the time of the extra excavation work, a telescopic member 22 is extended to an extra excavation section on the operation of a telescopic jack 23, and the earth excavated with the cutter 23 is agitated with a sub- agitation rod 24. In this case, the oscillation amount of the cutter 20 and the extension length of the member 22 are fed back, and synchronized with the rotation angle of the arm 12. Thus, the drilling and agitation work for special cross section is undertaken, depending on the rotation of the cutter arm 12. |
