| 摘要 |
PURPOSE:To exactly prevent the back flow of a grout by a method in which plural holes provided on the periphery of a cylinder through which grout is injected from its open end are closed with bundled elastic materials. CONSTITUTION:In a preventer for back flow of grout, which is to be screwed with a packer 22 inside a boring hole 3 attached to the tip of a supply hose 18 connected with a grout mixer 11, the large-diameter portion 31 of the inside through hole 29 of a cylinder 25 is closed with a blind bolt 26, the packer 22 is screwed with the small-diameter portion 30, and a collar 32 is formed at the central part of the periphery of the cylinder 25. Then, plural holes 33 are formed in two stages at equal intervals circumferentially on the right-handed side of the collar 32 along the axial direction, and the holes 33 are closed by fitting an elastic ring 27 wound with a band 28 into the right-handed side of the collar 32. Thereby, a grout in the cylinder 25 is discharged from the holes 33 into the hole 3 from the aperture in the cylinder 25 while deforming the ring 27, and therefore, the back flow of the grout can be prevented by the close adhesion between the ring 27 and the cylinder 25. |
