| 摘要 |
PROBLEM TO BE SOLVED: To give anticorrosive treatment to a specified region in a fluid pipe in a cost and construction advantageous manner. SOLUTION: At a pipe portion as part of a flow path or a connection position of the pipe portion, there is provided a protruded portion 4a protruded toward the flow path side or a recessed portion 4b opened toward the flow path side, or their combined portion 4A. At a site corresponding to the protruded portion 4a or the recessed portion 4b, or their combined portion 4A, out of a rust preventive bush 8 which is inserted into the pipe at its predetermined position in the state that part of the outer peripheral face faces the protruded portion 4a or the recessed portion 4b, or their combined portion 4A, a swollen and deformed portion 8A swollen and deformed outward in the radial direction is engaged with the protruded portion 4a or the recessed portion 4b, or their combined portion 4A so as to be relatively non-movable in the direction of a branch axial center X. COPYRIGHT: (C)2009,JPO&INPIT
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