Carries out maintenance and repair operations on the electrical system according to the instructions of the TBM Technical Office and/or the chief electrician. He also supervises and participates in the extension of TBM HV, LV, lighting and communication cables.

Performs maintenance and repair operations on the mechanical system as directed by the TBM Technical Office and/or the Chief Mechanic. Must be in constant communication with the Superintendent for routine and extraordinary maintenance and inspection of the "noble" parts of the machine such as main-drive, gear motors etc.

Performs the segment ring assembly process using the segment erector (vacuum or mechanical) in accordance with the approved safety and training standards for this equipment and within the construction tolerances imposed by the design.

The TBM operator must be an experienced TBM operator. He or she is responsible for operating the TBM in accordance with the TBM operating documents.

It supervises all feed parameters, produces the ring assembly report, and provides support to the TBM Shift Manager and TBM Shift Manager in analyzing TBM parameters related to machine operation modes.

The injection operator operates the mortar pumps for filling the annular void at the back of the segments and ensures that the amount of mortar is sufficient and meets the design requirements. is also responsible for keeping the machinery in good condition and reports any necessary repairs.

Must be in constant communication with the TBM Operator and TBM Foreman during the injection phase to report mortar quantities and to arrange for its feeding and preparation.

Performs segment transfer from the MSV to the erector.

The operator performs his work using machine installations such as quick-unloaders. shuttle-crane (usually vacuum) and segment feeder, safely and efficiently in accordance with approved safety and training standards for this equipment.

He is also responsible for segment inspection.

Performs control of the transfer of excavated material through the belt conveyor system and ensures proper operation of the machine belt system in accordance with approved safety standards and training for this equipment. Also supervises activities related to the maintenance and extension of the conveyor belts.

He is the operator who operates and moves the mechanical shovel for handling and/or loading onto dump trucks the debris from excavations (face abatement, wall excavation, reverse arch excavation, niche and recess excavation, etc.). Also handles daily cleaning and maintenance of the vehicle. He performs his work in areas inside the tunnel. When not engaged in the above work he actively participates in activities at the front and may help other operators in other activities.

The excavator miner is the skilled operator who operates and moves the excavator in areas inside the tunnel. The excavator is a machine used for all operations that require earthmoving, that is, the removal of portions of soil, such that it can be easily broken up. Excavation operations may be carried out with a hammer or bucket for breaking down the face during advance operations, excavation for making the invert arch and walls, niches and recesses, etc. He/she reports hierarchically to the mine team leader and when not employed in the above activities, may assist other workers in other work.

Worker assigned to the use of concrete pumping equipment (trolley pump) during cove pouring and who routinely provides cleaning and routine maintenance. participates in carpentry and/or reinforcing activities of concrete structures (inverted arch, walling, cove lining), contributes to the cleanliness and orderliness of the work site, and when not engaged in their own work may assist other workers in other activities.

He is a worker specialized in the construction of structures such as scaffoldings and concrete templates (formwork) with special reference to final underground lining works (caps, walls, inverted arches, niches, by-passes, manholes, etc.). As part of these activities, he takes care of the preparation of the formworks, their use, stripping, moving and subsequent disassembly. He also takes care of the execution of concrete castings and the preparation of what is necessary for such castings. His activities may include: studying the structures to be built, taking measurements, preparing wooden boards in the necessary size and quantity: sawing, drilling, passing on the wood products that allow rapid disassembly; assembling the formwork using the boards made or the panels already prepared; assembling and moving prefabricated formwork; taking care of concrete pouring, disassembling the formwork after the concrete has hardened. Uses tools such as hand saw, circular saw, hammer, planer, chisel, screwdrivers, screws, nails, electric-type hand equipment (drill, hose, screwdriver, etc.) and other hand tools and works mainly in places inside the tunnel. May perform lifting and slinging operations of various types of loads such as lumber, iron bundles, pipes, pallets containing materials, etc. Generally reports hierarchically to the carpenters team leader internal works and when not engaged in the above work may assist colleagues in other activities.

Worker in charge of operating the spritz pump and taking care of its routine maintenance. The lancist miner is responsible for placing the machine and, assisted by other workers, for its connection to the water and compressed air line. He performs the laying of spritz beton in quantities and thicknesses as stipulated in the project, assisted by other workers disconnects the machine from the connections listed above, retrieves the various extensions, removes the equipment from the work area, performs its cleaning, and takes care of its daily maintenance. When not engaged in his own work, he actively participates in work at the front and may help other workers in other activities.