Avoiding anchorage problems with resin-grouted roof bolts
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Avoiding anchorage problems with resin-grouted roof bolts

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      "Mine safety personnel reported occurrences of excessive "glove- fingering" and other problems with resin-grouted roof bolt installations. To study these problems, the Bureau of Mines designed a test plan to (1) obtain baseline information on several resin cartridges and (2) investigate the variables involved in the installation of a resin bolt. Three brands of resin representative of those used in the industry in January 1983 were selected for cartridge evaluation. The installation variables selected for study were the method of installation, the hole depth, and the hole annulus. These variables were studied by installing a series of bolts in concrete blocks using different values for each variable. Results of the research show that overspinning the resin may cause problems, but they can be avoided by using the spin times recommended by manufacturers. Excessive glove-fingering is not a problem if the manufacturer-recommended installation procedures are followed." - NIOSHTIC-2 NIOSH no. 10005970
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