| 摘要 |
PROBLEM TO BE SOLVED: To provide a propulsion pipe enabling a filler to be injected in a tail void so as to reliably suppress breakdown of the tail void.SOLUTION: A propulsion pipe is connected to a rear side of a tunneling machine in order to propel the tunneling machine that digs a natural ground. The propulsion pipe has a front part on the tunneling machine side and a rear part disposed behind the front part. The front part and the rear part are connected through a step part so that a diameter of the rear part becomes smaller than that of the front part. A hole is formed on the front part and the rear part, respectively. Different fillers are injected in a tail void formed by the tunneling machine through the holes.SELECTED DRAWING: Figure 8 |
