| 摘要 |
PURPOSE:To exactly obtain a packer effect by a method in which a grout discharge port is formed at the tip, a sleeve packer is provided on the base side, both ends of packer are fixed when the packer is operated, and a fluid pressure is applied from inside for expansion. CONSTITUTION:A discharge port 12 for a grout 19 is formed at the tip end, and a groove 15 is formed on the peripheral wall of the discharge port 12. Also, a sleeve packer 16 to be expanded by a fluid pressure and also to be restored when removing the fluid pressure, made of a flexible material, is fixed on both ends in a surrounding manner. Then, a fluid pressure is applied to the packer 16 for expansion, grout is injected into the surrounding ground from the grout discharge port 19 fixed to the wall of bore hole 18, the fluid pressure is removed after the injection, and the packer 16 is restored in such a way as to house it in the groove 15. Then, an injection and boring rod 1 is moved to the next forward stage, and thereafter these processes are repeated and grout 19 is injected. |
