| 摘要 |
PURPOSE:To build an underground wall which has a uniform strength in a vertical direction, by a method wherein excavated earth, sand and a solidifying solution are elevated by a screw part of one of adjoining rotary longitudinal shafts, while they are lowered by the screw part of the other rotary longitudinal shaft. CONSTITUTION:With a rotary device 1 turned, a rotary longitudinal shaft 2 is turned, and excavation is made by jetting a solution such as cement milk through a bit 5 at the tip of the rotary longitudinal shaft. Then, a mixture of the excavated earth, sand and a solution is moved upward while being mixed and agitated by a screw part 3 installed to the one of adjoining rotary longitudinal shafts 2, and the mixture is moved downward while being mixed and agitated by the screw part 3 attached to the other rotary longitudinal shaft, which results in performing a uniform mixture and agitation in both upward and downward directions. |
