Here's how it works and why it's used:
🔧 Purpose & Functionality
These machines are typically used for:
Drilling holes in the tunnel face, roof, or walls to insert rock bolts, dowels, or anchors.
Preparing the ground for blasting or for installing systematic tunnel support like mesh, shotcrete, or steel arches.
Supporting high or hard-to-reach areas with telescopic or articulated booms (arms).
🏗️ Why Use an Extended Arm?
Reach & Flexibility: The extended arm allows the operator to drill at various angles and heights without repositioning the machine constantly.
Safety: Keeps operators in a protected cab away from the face, reducing risk in unstable areas.
Speed: Drilling multiple holes quickly and accurately speeds up support installation.
💡 Common Applications in Tunnel Support
Rock Bolting: Stabilizes surrounding rock mass.
Forepoling / Pipe Umbrella Drilling: For pre-support in weak ground.
Lattice Girders or Steel Arches: Drilled holes help fix these supports in place.
Shotcrete Prep: Ensures good bonding by stabilizing loose rock before applying sprayed concrete.
Would you like a diagram or image of how it works in a tunnel setup? Or maybe want help choosing a machine for a specific tunnel project?
