| 摘要 |
PROBLEM TO BE SOLVED: To enable avoidance of continuity of construction depth at a high level and a decrease in vertical bearing capacity caused by cohesive soil remaining in a substitution column, and also improve excavatability.SOLUTION: In a device for producing a hydraulic solidification material liquid substitution column, an excavation head at the lower end of an excavation rod 1 is conically protruded downward and has a discharge port 22a for a hydraulic solidification material liquid and a spiral blade 25 in the direction of pushing excavated sediment upward, in a peripheral surface. At the time of excavation, excavation is performed by the spiral blade 25 and by pushing excavated sediment upward, excellent excavatability can be secured even if excavated sediment is sandy soil, and when the excavation rod 1 is pulled up, a hydraulic solidification material liquid is discharged.SELECTED DRAWING: Figure 15 |
