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    • 6. 发明公开
    • COMPOSITE TUBE
    • EP3561357A1
    • 2019-10-30
    • EP17888373.2
    • 2017-12-20
    • Bridgestone Corporation
    • MITSUHASHI, Kohei
    • F16L11/11B32B1/08F16L9/12
    • A composite pipe including a pipe body having a tubular shape and including a resin material, a covering layer including a resin material, the covering layer having a tubular shape and covering an outer circumferential surface of the pipe body, the covering layer having a bellow shape with annular ridge portions protruding outwardly in a radial direction and annular groove portions depressed inwardly in the radial direction, the annular ridge portions and the annular groove portions being alternately formed in an axial direction of the pipe body, and the covering layer being shortenable in the axial direction of the pipe body by being guided along the outer circumferential surface of the pipe body, and a porous resin layer disposed between the pipe body and the covering layer, the porous resin layer having compressively held portions that are compressed and held between the groove portions and the pipe body, and the porous resin layer having a repulsive force in a radial direction of from 21 N/cm 2 to 30 N/cm 2 at the compressively held portions.