| 摘要 |
PURPOSE:To enable to perform efficient mixture and agitation in a vertical direction, by a method wherein a plural number of rotary longitudinal shafts is arranged so that they spin in the same direction as that of each other, and a spiral direction of a screw part is set in a reverse direction to that of a screw part attached to an adjacent rotary longitudinal shaft. CONSTITUTION:With a rotary device 1 spun, rotary longitudinal shafts 2 are turned, and the ground is excavated as an earth and sand solidifying agent such as cement milk is jetted through a bit 5 at the forward end of the rotary shaft. In the excavating device A, a large-sized screw part 3a and a small-sized screw part 3b attached to the one of the adjoining rotary longitudinal shafts 2 are positioned facing and opposite to each other, a plural number of rotary longitudinal shafts is aligned so that they turn in the same direction as that of each other, and the large-sized screw part and the small-sized screw part are formed so that they spiral in a reverse direction to that of each other. This causes the excavated earth and sand and the solidifying agent to move upward as they are mixed and agitated, and allows them to move downward as they are mixed and agitated through the working of the large-sized screw part and the small-sized screw part, attached to the other rotary longitudinal shaft, which results in causing the excavated earth and sand and the solidifying agent to be mixed and agitated evenly in a vertical direction. |
