| 摘要 |
A mechanical anchor including an expansion shell and an expansion plug positioned in the shell is engaged with the end of a bar having helically extending rib segments formed on the outer surface of the bar. m e expansion plug has an internal bore defining a wall having a configuration to receive and mate with the helically extending rib segments formed on the outer surface of the bar. me mechanical anchor and a portion of the bar are inserted in a bore hole drilled in a rock formation and, upon rotation of the bar in a preselected direction, the expansion plug nonrotatably moves down the bar to expand the shell into engagement with the bore hole wall. As the shell engages the bore hole wall, the bar is mechanically anchored within the bore hole by the mechanical anchor. If it is desired to combine mechanical and chemical anchoring of the bar within the bore hole, the expansion plug is provided with a displaceable stop means positioned in the expansion plug bore, and a curable, two component bonding material is positioned in the bore hole ahead of the mechanical anchor. The stop means permits initial rotation of the mechanical anchor and ribbed bar within the bore hole to mix the bonding material components before the expansion shell is expanded. In addition, various other embodiments of a bar having helically extending rib segments formed on the outer surface of the bar and anchored in a bore hole are disclosed herein.
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