Last Updated:2025/11/29

The mason drove the jag bolt deep into the quarry face so the anchor would hold under heavy strain.

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The mason drove the jag bolt deep into the quarry face so the anchor would hold under heavy strain.

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石切場の石肌に、軸に切り欠きや棘のあるボルトを深く打ち込んで、アンカーが強い負荷にも耐えるようにした。

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