Here's how they cooperate in a typical tunnel workflow:
1. Rock Drilling Phase
The rock drilling jumbo drills blast holes or anchor bolt holes in the tunnel face.
This step prepares the rock for excavation (blasting or mechanical breaking).
Key role:
Create precise holes based on the tunnel design
Ensure correct depth, angle, and spacing
2. Excavation Phase
After drilling, blasting (or mechanical excavation) is carried out.
Broken rock (muck) is removed from the tunnel.
3. Initial Support Phase (Shotcrete)
A truck-mounted concrete pump supplies concrete to a wet shotcrete machine.
The shotcrete machine sprays concrete onto the tunnel walls and crown.
Key role of the pump truck:
Deliver continuous, high-pressure concrete flow
Support long-distance pumping inside tunnels
4. Coordination Between Equipment
They work in a cyclical sequence, not at the same time at the tunnel face:
Drilling jumbo finishes drilling → moves out
Blasting and mucking
Shotcrete spraying (using pump truck + sprayer)
Support installation (bolts, mesh, arches)
Cycle repeats
Practical Notes
Safety distance is required: drilling equipment must leave before spraying begins.
Ventilation is critical after blasting before shotcrete work starts.
The pump truck is usually positioned outside or at the tunnel entrance, pumping concrete through pipelines.
Simple Summary
Rock drilling jumbo → prepares the tunnel face
Concrete pump truck → supports shotcrete application
They are complementary machines in different stages, not operating side-by-side at the same moment.
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