Pumped storage power station, cross-section 9×10 m, Class IV surrounding rock. bolting rig equipped with Woserld hydraulic rock drill, hole depth 4.5 m, average drilling time per hole: 3 minutes 30 seconds.
Pumped storage power station, cross-section 9×10 m, Class IV surrounding rock. bolting rig equipped with Woserld hydraulic rock drill, hole depth 4.5 m, average drilling time per hole: 3 minutes 30 seconds.