| 摘要 |
PROBLEM TO BE SOLVED: To make a ground improvement apparatus smaller by performing convection mixing, scattering hardener riding the convection, and making mixing and kneading effect higher, also securing sufficient mixing in an up - down direction with slight movement of earth in the up - down direction in the ground thereby performing good ground improvement, and further shortening the length in up - down direction of the mixing apparatus because convection mixing is performed. SOLUTION: In a ground improvement apparatus capable of improving the ground by excavating a bore hole in the ground, a spiral-shaped mixing body 3 is attached to an inner shaft 2 having different turning direction, on the other hand, a mixing body comprising spiral-shaped mixing bodies 4, 7 is attached to attaching bodies 5, 6. And then a mixing body comprising a spiral-shaped mixing body 3 and spiral-shaped mixing bodies 4, 7 are rotated with their turning directions made different and excavation is performed.
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