| 摘要 |
PROBLEM TO BE SOLVED: To easily realize optimum excavating/agitating conditions according to the hardness and properties of ground particularly for an excavating action and an agitating and mixing action. SOLUTION: This ground improving device comprises a drive shaft 4 formed of double shafts, i.e., inner and outer shafts, a lifting means 3 for the drive shaft, an outer shaft side excavating/agitating means 20 attached to an outer shaft 6, an inner shaft side excavating/agitating means 10 attached to an inner shaft 5, a supply passage 15 for a stabilizer, and a discharge part 17. The ground is excavated by reversely rotating the outer shaft side excavating/agitating means 20 and the inner shaft side excavating/agitating means 10, and the stabilizer is discharged from the discharge part 17 into the soil to be excavated and the soil is agitated and mixed. The inner shaft side excavating/agitating means 10 has a small-diameter blade part 11 and an excavating bit 12 fixed to the inner shaft lower end. The outer shaft side excavating/agitating means 20 has an arm large-diameter blade part 20 and an excavating bit 23 fixed to the outer shaft lower end. The outer shaft side excavating/agitating means 20 and the inner shaft side excavating/agitating means 10 are so formed that the vertical distance therebetween can be adjusted by a height adjusting means 38 to separate the large-diameter blade part 21 and the small-diameter blade part 11 from each other and approach them each other. COPYRIGHT: (C)2008,JPO&INPIT
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