DYWIDAG-Systems International (DSI) manufactures and supplies specialist strata reinforcement and support products to the underground coal and metalliferous mining sectors.
DSI also exports the strata reinforcement and support products to the Asia-Pacific Region.
The DSI Friction Bolt is manufactured from a high strength steel tube, which has a slot along its entire length. A ring or collar is welded on the outer end to hold a domed plate to the rock surface.
The 33mm and 39mm DSI Friction Bolt is suitable for installation with hand held rock drills (stopers/drifters). The 47mm Friction Bolt is not suitable for installation with hand held rock drills (stopers/drifters).
The DSI Friction Bolts can be load tested by fitting a special ring to the bolt prior to its installation. Pull tests can then be conducted with a hollow ram hydraulic jack.
Further corrosion protection can be provided by hot dip galvanising. Standard bolt lengths include 450mm long bolts and bolts from 600mm to 2400mm in 300mm increments.
Non-standard lengths are available on application. The DSI Friction Bolts are supplied in standard packs of 150 bolts (39mm and 47mm) and 300 bolts (33mm).