Main Beam TBM
Open gripper-type TBM for competent to slightly fractured rock, built in diameters from 3 m (10 ft) to 15 m (50 ft); has excavated nearly 3,000 km of tunnel worldwide.
Designs and manufactures tunnel boring machines (main beam, single shield, double shield, crossover, and earth pressure balance types), small boring units, mining machines, conveyors, and TBM cutters for underground construction.
Open gripper-type TBM for competent to slightly fractured rock, built in diameters from 3 m (10 ft) to 15 m (50 ft); has excavated nearly 3,000 km of tunnel worldwide.
Shielded TBM enabling simultaneous boring and lining erection in fractured hard rock, built in diameters from 1.6 m (5 ft) to 15 m (50 ft); Robbins introduced the design in 1972.
Shielded TBM for massively fractured rock and broken ground with water inflows, built in diameters from 1.6 m (5 ft) to 15 m (50 ft) and rated for 10,000 hours of excavation.
Hybrid TBM convertible between rock, EPB, and slurry excavation modes for mixed and variable ground conditions; deployed as an 8 m diameter XRE machine at the Grosvenor Decline Project.
EPB TBM for soft ground beneath the water table, shield sealed to 10 bar, rated for 10,000 hours of useable life; deployed at 6.3 m for San Francisco's Central Subway.
Small-diameter boring machine for hard rock and mixed ground with cobbles or boulders, sized 24 in (600 mm) to 72 in (1.8 m), for rock strengths of 4,000-25,000 psi UCS.
Disc cutters from 6 in to 20 in diameter for TBM cutterheads, using wedge-lock mounting and case-hardened Timken bearings; fits Robbins and other manufacturers' machines.
Equipment rental, spare parts supply, and on-site field personnel and technical assistance for TBM and small boring unit projects.