Since its introduction 30 years ago the Swellex expandable rock-bolting system has gained wide recognition in the mining and tunneling industry. This unique rock bolt consists of a welded tube folded in upon itself, sealed at one end. It is re-expanded using a high pressure water flow provided by a special pump and adapter. The bolt is expanded inside the borehole drilled into the excavation wall. The installation process is easy and very similar to other rock bolt installation processes; making Swellex rock bolts accessible to all operators. Rock bolting systems are used to stabilize excavated rock mass in underground mines and tunnelling. Rock bolts are systematically arranged to transfer the load from the unstable surface or exterior of the rock, to the much stronger interior part of the rock. The rock mass can be reinforced by different types of rock bolts. Atlas Copco offers the following Swellex expandable rock bolting systems:
Designed as a daily support to provide safety and productivity for optimum control of the rock mass in mining and tunnelling. Made from specially engineered steel, these rock bolts offer high yielding and breaking load while perserving good elongation properties for safety. The connectable line of Swellex rock bolts, Pm24C, is a true alternative as long secondary support to secure potentially unstable areas or to control dilution while boosting productivity. The Swellex Premium line also comes in a plasticoated version for corrosion protection.
Designed and developed to match the "perfect rock bolt" criteria, the Manganese rock bolt has set a new benchmark for safety and reliability. Made from steel having a richer manganese content, and submitted to a specifically engineered process, Swellex Mn rock bolts have a high tensile strength and improved elongation that provide excellent energy absorbancy in challenging mining environments.
The Swellex Spartan line rock bolts are designed as daily support for optimum cost efficiency in mining and tunneling areas not requiring rock bolts with high ductility. Swellex Spartan rock bolts have high tensile strength for maximum cost control that will help profitability where rock mass conditions permit. There’s different environments in mining and tunneling. There are cases where the rock mass transfers very little energy into the rock bolts. And in such cases there is no need for a rock bolt that absorbs high energy, you just need a rock bolt that can reach peak load without having ductile properties for energy absorbency. The Spartan line has been engineered for these environments.