CORRUGATED COATING PIPE AND COMPOSITE PIPE

To maintain heat retention even when a corrugated coating pipe is bent.SOLUTION: A corrugated coating pipe 20 covering a flexible inner pipe 10 comprises annular peak parts 21 and annular valley parts 22 alternately arranged in a pipe axial direction, and a holding projections 23 arranged at equal intervals in the pipe axial direction. The holding projection 23 projects radially inward from the valley part 22 and holds the inner pipe substantially concentrically with the pipe axis by its tip 230. A distance D between the holding projections 23 is sufficiently short so that the inner pipe 10 does not come into contact with the valley part even when a coating pipe 1 is bent with the minimum bending radius R.SELECTED DRAWING: Figure 4 【課題】波形被覆管が曲げられても保温性を維持できるようにする。【解決手段】可撓性の内管１０を被覆する波形被覆管２０は、管軸方向に交互に配置された環状の山部２１および環状の谷部２２と、管軸方向に等間隔で配置された保持突起２３を備えている。保持突起２３は、谷部２２よりも径方向内方向に突出し、その先端２３０により前記内管を管軸と実質的に同心に保持する。保持突起２３の間隔Ｄは、被覆管１が最小曲げ半径Ｒで曲げられても内管１０が谷部に接しないように十分短くする。【選択図】図４