| 摘要 |
PURPOSE: A structure reinforced spiral pipe is provided to strengthen the bending stress in a reinforcing hollow portion of a spiral pipe by reinforcing both side walls and an upper face, and to increase the strength by forming supporting bars at the both sides. CONSTITUTION: A spiral reinforcing hollow part(11) is protruded in an outer face of a spiral pipe. Both walls of the reinforcing hollow part are reduced, and an upper face(13) is formed integrally with a lower face(22) of an auxiliary hollow part(18). A reinforcing wall(19) is formed at both walls of the reinforcing hollow part with a melting bar. The upper face of the reinforcing hollow part is stuck integrally to the lower face of the auxiliary hollow part regardless of the length of a melting bar mounted in the lower face of the auxiliary hollow part. A melting bar is formed in the end of an upper face of the auxiliary hollow part, and integrated with a reinforcing rib protruded in the upper face of the reinforcing hollow part. The structure of the reinforcing hollow part is strengthened with integrating the auxiliary hollow part with a corrugated reinforcing bar or with reinforcing an inclined supporting bar.
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