| 摘要 |
PROBLEM TO BE SOLVED: To provide a cut-off structure of an entrance for a jacking method, which can improve cut-off performance on the periphery of a starting mouth, even in the case of a jacked caisson having a projected corner and a member provided in a protruded or recessed manner on an outer peripheral surface.SOLUTION: This cut-off structure of the entrance for the jacking method includes a seal member 20 which is provided at the opening edge of the starting mouth 1, and a corner member 50 which is provided inside the seal member 20 at the corner 3 of the starting mouth 1, corresponding to a projected corner 11 of the jacked caisson 10. The corner 3 is formed in a curved shape so as to swell to an outside with respect to a passage position on the outer peripheral surface 12 of the jacked caisson 10. The corner member 50 includes an outer shell 51, the outside surface of which is formed in a curved shape along the corner 3, an elastic member 55 which is provided inside the outer shell 51, and a compression means 60 for compressing the elastic member 55. The elastic member 55 is compressed and deformed by the compression means 60, so as to be brought into contact with the inside surface of the outer shell 51 and the outer peripheral surface of the jacked caisson 10. |
