| 摘要 |
A roof bolt comprising a bar with a plurality of tabs at locations on the bar spaced longitudinally thereof, the tabs projecting radially outwardly from the bar. In the use of the roof bolt, the bolt is inserted into a hole drilled in a roof of an underground passage and anchored in the hole by resin adhesive held in a bag inserted into the hole prior to the insertion of the roof bolt. The roof bolt punctures the bag upon insertion into the hole and is rotated about its longitudinal axis to facilitate setting the resin adhesive for anchoring the roof bolt in the hole. The tabs thoroughly blend the resin adhesive upon rotation of the bar thereby improving the bond of the resin adhesive to the bolt. The tabs also engage the hardened resin adhesive to provide a support for loads directed generally outwardly of the opening.
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