Mr Mike
Active member
I am looking to replacing some anchors in a shaley type rock down a mine. The face has some really old anchors made from what looks like to be threaded M10 bar, that has been inserted into deeply drilled holes. The location is over a shaft, the wall is covered in calcite flows and the rock is a blocky shale as found around Nenthead area down the mines there.
Can you successfully bolt such rock by say for example, drilling a deep hole in the order of 0.3-0.5m, knocking a threaded bar in to this and placing a standard hanger on the end. The load would be 90-120deg to the bar and wall. Does anyone use such a method for this type of rock?
Would a resin be needed to hold the bar, or would the depth and fact that it would only be loaded at 90-120deg be enough to keep in in most situations?
Can you successfully bolt such rock by say for example, drilling a deep hole in the order of 0.3-0.5m, knocking a threaded bar in to this and placing a standard hanger on the end. The load would be 90-120deg to the bar and wall. Does anyone use such a method for this type of rock?
Would a resin be needed to hold the bar, or would the depth and fact that it would only be loaded at 90-120deg be enough to keep in in most situations?