| 摘要 |
PURPOSE:To increase the area of an improve ground, by a method wherein a multishaft auger is constituted such that it is individually and wholy rotatable and capable of being slidably displaced in a direction extending parallel to the auger part. CONSTITUTION:A guided rod 1 is inserted into a ground to a given depth through individual rotation of auger parts 2b and 2b' and chain saw belt 15 by menas of a third riving device 14. The whole of a multishaft auger 2 is rotated through rotation of the guide rod 1 with the aid of a first driving device 8 in a condition that individual rotation of the auger parts 2b and 2b' is contin ued, and in which case, the ground is agitated in a range of about 1/2 of a length parallel to the auger parts 2b and 2b' forming a rotation radius. Further, by slidably displacing the auger 2 in a direction extending parallel to the auger parts 2b and 2b' with the aid of a second driving device 13 in a condition to continue rotation of each part, a ground is agitated in a range of about the overall parallel length of the auger parts 2b and 2b' forming a rotation radius. |
