| 摘要 |
PURPOSE:To use properly modes of rotating excavation and to make it possible to execute efficiently by projecting enlarged stirring blades capable of expansion, using both rotating excavation and stirring operation to make the mixing and treating of a larger diameter, and making a land improving body. CONSTITUTION:Fixed stirring blades 4 and bar-shaped enlarged stirring blades 6 in hollow sections of them are mounted horizontally in the direction of the diameter of the lower end of a rotating blade shaft 3 so that they are capable of coming and going. The fixed stirring blades 4 rotate and excavate the ground to the depth to be required and, at the same time, slurry of ground stabilizer such as concrete is discharged from the front ends of them to project the enlarged stirring blades 4 when they are pulled out after the mixing and treating 21 is made, the mixing and treating 21 of a larger diameter is made by rotating excavation and stirring operation, and a land improving body 22 is made by a procedure of two stages of rotating excavation. According to the constitution, modes of rotating excavation are properly used by a hard and poor land without receiving large excavation resistance, and execution can be efficiently carries out. |
