| 摘要 |
A synthetic resin pipe intended for underground use is disclosed having both an improved strength and flexibility but reduced weight. An inner layer of the body of the pipe is formed of a synthetic resin, and a reinforcing layer is wound around the inner layer. The reinforcing layer is porous, and may be composed of a helically wound punched metal belt, mesh, or the like. An outer layer composed of a helically wound belt of synthetic resin having a high fusibility with the material of the inner layer is formed over the reinforcing layer. A reinforcing rib, forming the corrugations of the pipe, is wound around the outer layer. If desired, the reinforcing rib can be made integral with the belt of the outer layer.
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