| 摘要 |
PROBLEM TO BE SOLVED: To provide an underground anchor capable of easily making a large solid lump on the front end of an underground anchor main body. SOLUTION: A spiral excavation edge 2a provided to the front end side of a bar-shaped underground anchor main body is inserted in a prepared hole bored in the ground and is rotated to bury. In that case, a through-hole 4 is bored so as to pass through the axial center of the bar-shaped underground anchor main body, at the same time, openings 5a and 5b connecting to the through-hole 4 are bored in the side of the front end side of the underground anchor main body, and consolidation agent supplied to the through-hole 4 is discharged from the front end of the through-hole 4 and openings 5a and 5b into the ground.
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