| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily repair even if the vicinity of an attachment portion between main pipes and a branch pipe is damaged, by joining a branch coupling to end portions of the main pipes so as to be movable in an axial direction. SOLUTION: In a connecting portion of a main drain pipe made of hard vinyl chloride resin and a branch pipe, a branch coupling 3 provided with a branch pipe portion 32 between main pipes 1, 2 disposed so as to leave a space between them, and end portions of the main pipes 1, 2 are joined with the main pipe portion 31 of the branch coupling 3 so that the main pipe portion 31 can move in an axial direction to the end portions of the main pipes 1, 2. Further, the branch pipe portion 32 of the branch coupling 3 is provided with a spherical-shell-like portion 321, and a short tubular portion 322 in which a spherical outer surface is fitted to be capable of sliding, thereby enabling freely changing of an angle of a branch pipe 4. Accordingly, even if the branch coupling 3 is damaged, the branch coupling can be detached form a connecting portion between the main pipes 1, 2 by moving the branch coupling 3, main pipe 1 or 2, toward an axial direction, thereby repair or exchange with a new one can easily be carried out.</p> |
