| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bend piping device with which a wall through-hole formed in a wall plate in order to let the rising part of a piping device main part through can have a shape which is easy to form. SOLUTION: The rising part 3 of a piping device main part M is formed into a cylindrical shape. The cross-section of the rising part 3 has a track shape which consists of a pair of facing semi-circular arcs separated from each other with a predetermined interval and a pair of line segments which are in parallel with each other, and with which the respective ends of the pair of semi-circular arcs are connected to each other. The lengths of the pair of line segments of which the track shape consists are gradually reduced in the rising direction of the piping device main part M.</p> |
