| 摘要 |
PURPOSE:To reduce the loss of sending pressure as well as running cost of grout injection system by using a system in which a grout is shut down or injected by opening or closing a grout injection portion by the relative displacement of a thrust pipe to a grout injection tube. CONSTITUTION:A boring water supplied passes through a conduit hole 21, a through hole 24, a ringed groove 22, a through hole 23, and a conduit hole 20 and opens a ball 18 to support the boring operation. When a boring grout injection tube 10 reaches a given depth and an injection tube body 13 is pulled up through a joint rod, a thrust pipe is stayed at its fixed position by the weight and action of an elastic panel 28 and the friction between it and the ground and displaced through a spline 19 relatively, the through hole 24 of rising injection tube body is positioned above the grout injection portion 25 of the thrust pipe 12 and opened on the ground's surface, and the grout is injected from the grout injection portion 25, or the through hole 24, into the ground and gelled there. |
