The MSBU is available in a range of diameters from 48-72 inches (1.
The MSBU and SBU are designed to excavate medium to hard rock; however, both machines can be fitted with cutterheads that bore through mixed ground conditions.
Both the MSBU and SBU are made to bore through a variety of rock strengths and types with an unconfined compressive strength of 4,000 psi to more than 25,000 psi.
The Robbins MSBU can be steered to maintain line and grade for the entire bore due to an articulating front shield.
This PROJECT includes the improvement of the roadways identified in Silver Springs Acres MSBU
, specifically clearing and grubbing, excavation (swales), road stabilization, sod, ditch blocks, surveying and MOT.