| 摘要 |
A composite rigid tubular manufactured article, which is particularly resistant to direct loads in planes orthogonal to the axis thereof, is produced by interposing a spacer element, which is constituted by at least one tubular element (16, 24, 30) of plastics material which is helically wound around the internal cylindrical member (10), in the gap which is formed by at least two coaxial cylindrical members of plastics material (10, 12, 26), which are rigidly connected to each other by a reinforcing layer (18, 32). The reinforcing layer (18, 32) is arranged with a wave-like course, in the concavities of which the turns of the tubular spacer element (16, 24, 30) are located, and permanent chemical bonds are formed in the contact zones between the surfaces thereof and the walls (20, 22, 34, 36) of the coaxial cylindrical members, which walls are at the inner side relative to the gap. |
