Double Shield Tunnel Boring Machine

Fractured rock can be an insurmountable obstacle if you buy the wrong machine. Your crew safety and efficiency is at risk, and so is your schedule. With a Robbins Double Shield Tunnel Boring Machine (TBM), your project can have a great safety record and peak performance.

Robbins is no stranger to this type of Double Shield Tunnel Boring Machine design. In fact, this is another type of TBM we invented! In 1972 Robbins built the worlda s first Double Shield Tunnel Boring Machine for a customer who anticipated tunneling through large sections of fractured rock. In recent years, several Robbins Double Shield TBMs have broken world records for production.

Unique Features of our Double Shield Tunnel Boring Machine :-
* Flat, low profile cutterhead to enhance face support in broken rock.
* Recessed muck bucket openings with grill bars to prevent ingestion of large rock blocks.
* Back-loading cutters for safe cutter changing in unstable rock conditions.
* Dual thrust-reaction systems, enabling thrust reaction from the tunnel walls or the tunnel lining.
* High-speed segment erector (single- or dual-arm depending on machine diameter) installs pre-cast concrete segments with precision.
* Two-piece articulated telescopic shield offers safety, access to surrounding ground for examination and treatment, and smooth steering through curves.
* Digital guidance system for continuous information on alignment for maintaining strict control of tunnel line and grade.