| 摘要 |
<p>A flexible pipe, comprising a spiral tube manufactured by spirally winding long materials of approximately S-shape in cross section so that the upper parts and the lower parts thereof are partly overlapped with each other and a tube manufactured according to the shape of spiral groove parts formed between the upper and lower parts on the inner surface side of the spiral tube. Since recesses and projections are formed on the tube according to recesses and projections on the inside of the spiral tube, and the spiral tube is formed integrally with the tube, the wall thickness of the tube can be reduced and the entry of a liquid from the outside therein can be prevented. Since an internal pressure is received by the entire parts of the spiral tube and the tube, the pressure resistance of the pipe can be increased. Also, since the tube is disposed in a part of the spiral tube, the flexibility of the pipe can be varied.</p> |
