| 摘要 |
The present invention enables grout to be smoothly supplied by forming a manifold in an expansion bit and supplying the grout to both sides through the manifold. A grout discharge valve automatically opened and closed due to the spraying pressure of the grout is installed so that a phenomenon in which soil reversely flows into the expansion bit is prevented and continuous construction can be possible, thereby improving workability and preventing the grout discharge valve from being blocked in advance. An excavation tip can be attached and detached so that the excavating device can be easily repaired. The excavating device also reduces production costs by replacing only the excavation tip. |
