Atlas Copco provides a rock bolt that adapts to large ground movements
The Roofex rock bolt that perfectly adapts to large rock mass movements, while maintaining a constant load capacity, has been further developed and tested by Atlas Copco and is now fully launched worldwide.
High rock mass stress conditions in underground excavations have always been a serious challenge for rock bolting systems, only partially handled by conventional bolting systems.
Stresses may lead to serious stability problems, high deformation rates or rock burst phenomena.
Atlas Copco’s commitment to safer and more productive solutions in rock reinforcement has resulted in Roofex, a highly advanced rock bolt designed to dissipate high amounts of rock mass deformation energy. The deformation process can be almost static like in the case of large displacements in yielding ground, or it can be extremely sudden and violent as in the case of rock burst or seismic events. Roofex is designed to accommodate the whole spectrum of rock mass movement, with accurate pre-set deformation behaviour.
The new Roofex bolt system is based on a steel-steel interaction with a high quality steel bar travelling through a patented energy absorbing element fixed with resin or cement grout inside the borehole, providing a reliable and constant load capacity during yielding.
The Roofex bolt is produced in standard lengths typically used in mining and tunnelling, and the displacement capacity is pre-set to order during manufacturing.
Along with the Roofex concept there are two types of monitor bolts available, which allow for direct visual monitoring of rock mass movement and hence provide predictability to the rock reinforcement system.
Mathias Lewén, Vice President Communications
Atlas Copco is a world leading provider of industrial productivity solutions.
The products and services range from compressed air and gas equipment, generators, construction and mining equipment, industrial tools and assembly systems, to related aftermarket and rental. In close cooperation with customers and business partners, and with 135 years of experience, Atlas Copco innovates for superior productivity. Headquartered in Stockholm, Sweden, the Group’s global reach spans more than 160 markets. In 2007, Atlas Copco had 33 000 employees and revenues of BSEK 63 (BEUR 6.7). Learn more at www.atlascopco.com
Atlas Copco Geotechnical Drilling and Exploration is a division within Atlas Copco’s Construction and Mining Technique business area. It develops, manufactures, and markets equipment for exploration drilling and ground engineering. The division is headquartered in Märsta, Sweden, with production in Canada, Sweden, Finland, Austria, South Africa and China. The division employs approx. 700 people worldwide. Atlas Copco MAI, located in Feistritz/Drau, Austria, is the main facility for rock and soil reinforcement.