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  • Users: sstanton01
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  1. sstanton01

    Excessive grout take-up in coarse gravel layer - Down Hole Drilling - Rock Anchors

    Please review the attached sketch. We're looking for suggestions on how to stabalize the course gravel cobble layer. We are duplex drilling with 7 5/8" dia. 0.5" wall casing. Using a 6 1/4" button bit on a 6" down the hole hammer with 4 1/2" inner drill steel. We stopped advancing the casing...

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