| 摘要 |
PROBLEM TO BE SOLVED: To display the earthquake-resistant property sufficiently, even though a steel pipe utilizing a steel material manufactured normally is provided as a buried pipe. SOLUTION: Low yield strength steel pipes 2 are provided continuously through couplings 3 to form a conduit line 1. The low yield strength steel pipe 2 is used for ordinary piping. Insted of a carbon steel pipe, a low yield strength steel pipe 2 with a low yielding point is used for piping to form an earthquake- resistant conduit line. The yielding point is 24 kgf/mm2, and the maximum strength M is 41 kgf/mm2 in the carbon steel pipe, while the yielding point is 16 kgf/mm2, and the maximum strength N is 30 kgf/mm2 in the low yield strength steel pipe 2. The low yield strength steel pipe 2 can be formed by utilizing a very low carbon steel member manufactured normally.
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