| 摘要 |
PROBLEM TO BE SOLVED: To provide an extension concrete pile for positioning so as to put a pine pile under a groundwater level. SOLUTION: The forms of the cast-in-place concrete extension pile are composed of a steel pipe (2) for burying the pine pile (1) under the groundwater level, a cap (b) connecting the upper section of the pipe and a pile driver and a ring plate (f) or the like installed to the lower section of the steel pipe.
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