| 摘要 |
PROBLEM TO BE SOLVED: To provide an unnecessary object removal device inside a pipe, for removing highly viscous compressed soil stuck to an inner surface of a short cylinder steel pipe to be press-fitted while fetching soil into the pipe, in a jacking method.SOLUTION: The unnecessary object removal device includes: a water supply pipe 3 which is to be inserted into the pipe; water discharge means 5 which is to be inserted in the water supply pipe, is hollow, and has a water discharge port 4 formed at the distal end; and holding means 6 which is provided on the distal end of the water supply pipe 3 and holds the water discharge means 5 inside the water supply pipe 3 in the state that the water discharge port 4 of the water discharge means 5 is projected from the water supply pipe 3. |
