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    • 10. 发明公开
    • Coated metal pipe having bending capability
    • Biegbares beschichtetes Metallrohr。
    • EP0271239A1
    • 1988-06-15
    • EP87310208.1
    • 1987-11-19
    • SHAW INDUSTRIES LTD.
    • Jarvis, Harold F.Gelfant, Frederick S.
    • F16L57/00F16L58/16B28B19/00B28B21/48
    • F16L58/16B28B19/0038B28B21/48F16L57/00
    • In a concrete-wrapped pipe having an inner water-­impermeable resinous coating (11), the concrete wrapping is formed with a continuous inner portion (12a) covering the resinous coating and a helically slotted outer portion (12b), the helical slot extending at least to the depth of a mesh reinforcement (14) embedded in the concrete. The structure is characterized by the fact that the inner portion (12a) of the concrete wrapping (12) is formed with one or more helically extending zones (18) of reduced compressive strength, radially aligned with the helical slot or slots (13) in the outer portion (12b). The helical configuration breaks the continuity of the concrete wrapping in the longitudinal direction of the pipe and, even with pipe of relatively large diameter, enables the wrapping to accommodate limited bending of the pipe.
    • 在具有内部不透水树脂涂层(11)的混凝土包裹的管中,混凝土包裹物形成有覆盖树脂涂层的连续内部部分(12a)和螺旋形开槽的外部部分(12b),螺旋槽 最小到埋在混凝土中的网状钢筋(14)的深度。 该结构的特征在于,混凝土包裹物(12)的内部部分(12a)形成有一个或多个具有降低的抗压强度的螺旋形延伸区域(18),与螺旋槽或槽(13)径向对准 外部部分(12b)。 螺旋构造破坏了管道纵向方向上的混凝土缠绕的连续性,并且即使使用相对较大直径的管,也能使缠绕件适应管道的有限弯曲。