| 摘要 |
PURPOSE:To absorb the internal stress of the ground due to the injection of a hardening agent by the upper and peripheral columnar disturbed portions by using a disturber having agitating blades on right and left sides of the diametrical direction near the lower end of its hollow rod and also upwardly directed jet ports below the agitating blades. CONSTITUTION:In a disturber 10, agitating blades 14 are attached on right and left sides of diametrical direction at a downward angle of 30 deg. near the lower end of a vertical hollow rod, and jet ports are provided upwardly at an angle of about 15 deg. to the horizontal direction below the agitating blades 14. The disturber 10 is penetrated into the ground 20 while being turned to form columnar disturbed portions 21 in order, and the disturber 10 is again penetrated into the disturbed portions 21 while being turned and then pulled up while injecting a hardening agent 26 to form a jet injection hole 24. In this case, overmuch internal stress in the corresponding hardener portion in the ground is absorbed by the nearby columnar disturbed portion 21. And the portion is discharged as discharged soil to the surface of the disturbed portion 21. |
