The start of the project was marked by a cutterhead lowering ceremony in the presence of Argentine president Albert Fernandez, other government officials and national water company AySA.
The two machines will be used by CMC di Ravenna to excavate through variable soft ground geology, ranging from silts to sandy silts with some cobbles expected. Mining at an average 25m depth, the TBMs will install precast concrete rings comprising segments 250mm thick and 1,400mm wide in a four-plus-two (key) configuration.
Terratec said the TBM’s high-torque, soft-ground cutterheads have a spoke-style design with a 49% opening ratio. Cutting tools comprise fixed and back-loading knife bits that help ensure rapid advancement and minimum interventions.
