| 摘要 |
PROBLEM TO BE SOLVED: To provide a passage blocking device, easily performing work on a blocked space, while achieving breakage prevention and service life elongation of a blocking bag, and securing insertion of a blocking bag into a passage in a tube and closure of the passage.SOLUTION: In the passage blocking device S, the blocking bag 10 is constituted of double structure of a tubular inner bag 10A elastically expanded and deformed on an enlarged diameter side and a flexible tubular outer bag 10B lower in expansion rate than the inner bag 10A. A bag diameter enlarging fluid A is supplied into the inner bag 10A through an annular passage 13A formed between an outer face of an inner tube shaft 12 and an inner face of an outer tube shaft 13, to elastically expand and deform the inner bag 10A on an enlarged diameter side. The inner tube shaft 12 communicates with the blocking bag 10, while the inner tube shaft 12 extends between an opening end part 10c on an insertion rear end side of the blocking bag 10 and an opening end part 10b on an insertion tip side to penetrate an internal space 10a of the inner bag 10A. A communication path 12A for a work in a tube is formed to the inner tube shaft 12 and extended at least from the opening end part 10c to the opening end part 10b of the blocking bag 10. |
