| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem that to prevent the occurrence of corrosion due to fluid in a corrugated pipe made of a metal to absorb a change of expansion and contraction due to a temperature difference of piping in a line to be laid and relative displacement due to unequal settlement, the whole of the corrugated pipe is constituted by using a corrosion resistant steel sheet of a single material regardless of corrosion environment occurring due to a kind of a line and fluid, whereby a corrosion resistant corrugated pipe of this kind is increased in a cost too high and an increase in a cost occurs. SOLUTION: Since it is predictable that corrosion occurs to the different portions extending along the axis of the corrugated pipe made of a metal due to a corrosion medium contained in flowing fluid, a corrosion resisting material A formed of a corrosion resistant steel sheet is allotted to the limited portion along the axial direction of a corrugated pipe body 1 on which waveforms 1a and 1a are applied and a tough material B formed of a toughness steel sheet is allotted to and joined at 5 and 5 with a part except the limited portion to form the corrugated pipe made of a metal.</p> |
