Underground Rock Bolt Drilling Operations for Tunnel Construction
The underground rock bolt drilling rig plays a critical role in modern tunnel stabilization processes. This specialized equipment performs precision drilling through rock formations to install systematic anchor systems that reinforce tunnel structures. Utilizing either hydraulic or pneumatic power systems, the drilling unit typically features a feed beam mechanism that enables controlled advancement of the rotary-percussive drill head. During operation, the rig's alignment system ensures accurate positioning of rock bolts according to engineering specifications, maintaining strict adherence to planned spacing patterns and installation angles. Post-drilling, the system facilitates simultaneous grout injection through hollow stem drill rods while withdrawing the bit, ensuring complete cement mortar filling in the annulus. Advanced models incorporate real-time torque monitoring and automatic feed pressure adjustment to accommodate varying geological conditions, significantly enhancing safety and efficiency in challenging underground environments. These operations are typically conducted in conjunction with shotcrete application, forming an integrated primary support system that mitigates ground movement risks during tunnel excavation phases.