HOW ROCK BOLTS ARE MADE Most solid rock bolts are manufactured by producing a deformed bar in a hot rolling mill. These deformed bars have deformations or ribs which run around the circumference of the bar, and they provide an interlock and load transfer mechanism with the resin or grout […]

Rock bolting is one of the most efficient supporting devices ever developed. The earliest case of using bolts as a rock reinforcement method was in a slate quarry in North Wales in 1872 (Schach et al., 1979). In 1918 a coal mine in Germany introduced bolts as a means of ground […]