| 摘要 |
PROBLEM TO BE SOLVED: To provide a bit of a concrete footing casting micro-pile capable of preventing the clogging of a hole for the bit with excavated soil in of excavation. SOLUTION: A stirring wing equipped with a jetting hole for jetting a grout is formed on the peripheral surface of a bit main body mounted to the front end of the micro-pile, at the same time, a hole clogging prevention stirring wing longer than the stirring wing is projected, and a hole clogging prevention space can be made around the jetting hole by the hole clogging prevention stirring wing with the rotation of the bit main body.
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