| 摘要 |
TITLE METHOD AND APPARATUS FOR SUPPORTING A MINE ROOF A reinforcing rod having a threaded end portion with a coupling secured thereto is inserted in a drill hole of a rock formation, such as a mine roof, with the threaded end adjacent the emergent end of the drill hole and the opposite end in contact with cartridges containing a resinous composition positioned within the drill hole. A bolt having a threaded end portion is engaged to the coupling. A roof plate is retained on the opposite end of the bolt extending from the drill hole. A shear pin is positioned transversely in the coupling and maintains the adjacent end portions of the rod and the bolt in spaced relation to permit rotation of the connected rod and bolt in the drill hole to fracture the resin cartridges. Contact of the threaded end of the bolt with the shear pin maintains the roof plate spaced from the face of the rock formation as the resin is mixed and allowed to cure to adhesively bond the rod to the rock formation. With the rod anchored to the rock formation further rotation of the bolt advances the bolt through the coupling to shear the pin and urge the roof plate into abutting relation with the rock face. Continued rotation of the bolt tensions the bolt and compresses the rock strata to provide a reinforced rock formation. |
