| 摘要 |
PROBLEM TO BE SOLVED: To provide an anchor body simultaneously extracted prevention device capable of simply and surely preventing an anchor body from being pulled out together with a boring pipe and surely accomplishing not only a pipe rod method but also every anchor or lock bolt method. SOLUTION: After a boring pipe P is used to bore a bedrock up to a specific depth, the boring pipe P is pulled out by length to be required, and an anchor body A having a back prevention metal fixture 1 on the front end thereof is inserted into the boring pipe P. After the anchor body A is pushed thereinto to separate the back prevention metal fixture 1 on the front end of the anchor body A from the front end of the boring pipe P, the boring pipe P is pulled out. In this case, since an interlocking pin 3 of the back prevention metal fixture 1 on the front end of the anchor body A is interlocked with an excavated wall surface, the anchor body A is surely held in a position thereof, and the anchor body A can be prevented from being pulled out together with the boring pipe P.
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