| 摘要 |
PURPOSE:To prevent the adherence of solids to the tip devices, etc., of a grout injector by a method in which a sleeve tube is provided above a piston provided under a condition that it is sealed for the inner surface of the sleeve tube on the basal periphery of a tip device, and an closed aperture for introducing a working fluid for the piston is formed between liquid supply tubes. CONSTITUTION:A straighner tube is made up of a tip member 1 with a liquid discharge port 101, a liquid supply tube 2 through which liquid is supplied to the discharge port 101 and capable of slidably moving toward the axial direction in relation to the tip member 1, and a sleeve tube 4 fitted in a slidably moving manner toward the axial direction in relation to the tip member 1 on the outsides of the tip member 1 and the liquid supply tube 2. On the basal periphery of the tip member 1, a piston part 102 fitted with a seal ring 103 in the gap for the sleeve tube 4 is provided, and above the piston part 102, a closed aperture for introducing working fluid for the piston part 102 is formed between the sleeve tube 4 and the liquid supply tube 2 by the seal ring 103. |
