| 摘要 |
PROBLEM TO BE SOLVED: To provide a relatively small-scale ribbed reinforced concrete pile. SOLUTION: A cloth bag being brought into close contact with the outer periphery of an excavated pile hole and having a diametrally expanded ribbed part in a longitudinal required place is inserted into the pile hole, a diametrally expanding part is diametrally expanded in the outer peripheral direction of a pile by a diameter expanding means, and an already set-up cage is inserted into the cloth bag to place concrete.
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