| 摘要 |
PROBLEM TO BE SOLVED: To provide a septic tank requiring no installation work of a support or a wall and capable of being inexpensively executed in a short period of time. SOLUTION: If the septic tank is manufactured from a material whose yield strength after repeated fatigue of 10,000 times is measured under load of 1/6 of initial yield strength holds 80% or more of the initial yield strength, a problem such as the generation of crack caused by repetition, or the like, is not generated when the septic tank is actually used and the septic tank can be installed even if a support or a wall is not used.
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