| 摘要 |
PROBLEM TO BE SOLVED: To cope with the excavation of holes of various plane forms by batch- holding a plurality of soil improving devices to a frame or the like so as to be able to optionally change a mounting space. SOLUTION: This multiple type soil improving device comprises a plurality of soil improving devices 1, each having an excavating rod 11 and a driving device and having an agitation blade 14 at an excavating part 13 at the tip of the rod, batch-held by the frame 3 and provided in a vertically movable manner at a working derrick 4. A plurality of soil improving devices 1 are mounted in a mutual space adjustable manner to the frame 3 so that the respective agitation blades 14 are positioned in quadrangular or rectangular shape being spaced, brought into circular contact or overlapped with each other.
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