| 摘要 |
PURPOSE: A synthetic resin pipe having triangular reinforcement structure is provided to improve the strength of the synthetic resin pipe by forming a triangular hollow at the pipe. CONSTITUTION: An extruding member has a triangular reinforcement(6) formed at the outside of a triangular hollow(5). A connecting member(7) is installed between the extruding members, and connects the extruding members. A finishing member(8) is formed at the outside of the extruding member and the connecting member.
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