Key Functions:
Drilling Boreholes – Creates holes of varying depths and diameters in rock formations.
Support Installation – Provides the drilled holes needed to insert reinforcement materials like bolts and resin.
Efficient Operation – Speeds up the support cycle compared to manual drilling.
Safety Enhancement – Reduces the risk of rock falls by quickly securing unstable sections.
Types of Rock Drilling Machines for Tunnel Support:
Single-boom drilling jumbo – Compact, suitable for small or narrow tunnels.
Double/Triple-boom jumbo – For large tunnels, allows simultaneous drilling at multiple points.
Handheld pneumatic/electric drills – Used in small-scale or limited-access areas.
Features:
Hydraulic or pneumatic drilling power.
Ability to work in confined tunnel environments.
High penetration rate for hard rock.
Option to integrate with bolting rigs for immediate support installation.
Application in Tunnel Support:
After excavation (blasting or mechanical cutting), drilling machines prepare holes for rock bolts.
Holes are filled with grout, resin, or anchors to bind unstable rock layers.
Often used together with wet shotcrete machines to provide a combined support system (bolts + sprayed concrete).
⚙️ Example: In a 1000-meter tunnel project, a double-boom hydraulic drilling jumbo may be used to drill multiple holes simultaneously for efficient rock bolt installation, ensuring safe and continuous excavation.
Would you like me to also prepare a comparison between rock drilling machines and wet shotcrete machines for tunnel support, so you see how they work together?
