Mining in Manitoba
Steel Support
Mine Development
Steel sets are used in the mine entries of a number of coal mines and in shafts of metal mines. In most cases, the load is taken as a factor multiplied into the sum of the width and height of the tunnel. Steel can be erected in a shorter time and by fewer men than timber. Timber rots and decays behind concrete lining, which results in an uneven load on the framing or lining.
The process of rock bolting consists of 3 steps: 1) anchoring the bolt in a hole, 2) applying tension to the bolt to place the rock under compression parallel to the bolt and 3) placing the bolt in such a pattern that they will properly support the rock structure. The basic principle of bolting is that it should make the bolted rock an integral part of the supporting structure.
