E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/47
E21D 20/02 (2006.01)
Patent
CA 1249446
ABSTRACT OF THE DISCLOSURE A mechanical anchor including an expansion shell and a camming plug positioned in the shell is threaded onto the end of a mine roof bolt. A roof support plate is carried on the opposite end of the bolt. The mechanical anchor is inserted in a bore hole drilled in a rock formation with one or more resin cartridges advanced by upward movement of the bolt to the end of the bore hole. The cartridge is ruptured by upward thrust and rotation of the bolt to release the resin components for mixing. A stop device extending through the plug abuts a tapered end of the bolt to prevent axial movement of the plug on the bolt when the bolt is rotated in a preselected direction to mix the resin components before the shell is expanded. Rotation of the bolt continues without expansion of the shell for a period of time to permit formation of a curable resin mixture. As the resin mixture begins to harden rotation of the shell and plug is resisted until the stop device is displaced by the bolt tapered end permitting relative rotation between plug and the bolt. The plug nonro- tatably moves down the bolt upon continued rotation of the bolt in the same preselected direction to expand the shell into engagement with the wall of the bore hole before the resin mixture cures. The cured resin bonds the bolt and expanded shell to the rock formation to resist slippage of the expanded shell and maintain the bolt in tension. -28-
567576
Calandra Frank Jr.
Macrae & Co.
LandOfFree
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