| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piping structure capable of reducing the influence of thermal expansion of piping material without enlarging the size of a protective duct so much. <P>SOLUTION: In the piping structure 2, a restriction body 3 having a radially expanded part 3a radially expanding from the outer periphery of a piping material 1 is immovably installed in the axial direction of the piping material 1 in the middle relative to a straight piping part 1a in which the piping material 1 constituted of a crosslinked polyethylene pipe or polybutene pipe is installed in a straight shape. A protective duct 4 to store the piping material 1 together with the restriction body 3 has a checking part 4a which is engaged with the restriction body 3 not so as to exert influence of linear expansion due to heat of one side pipe part 1b to the another side pipe part 1b on the pipe parts 1b and 1b located on both sides of the restriction body 3 in the straight piping part 1a, and restricts the restriction body 3 from moving toward the another side together with the piping material 1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
