Solutions for all geological conditions
The excavation of the 162 km of tunnels for the cross-border section is being tackled using various excavation methods: about 40% with the traditional ones and 60% with the mechanised one. Moreover, TELT has decided to promote the implementation of the innovative BIM approach, which represents a revolution in the field of project management.
Mechanised digging using a TBM
TBMs – Tunnel Boring Machines are impressive machines, custom-built to dig underground quickly and safely. The cutter is configured as a “travelling industry”: it allows to mechanise and automate all the excavation, clearing, and soil transport activities, thus reducing to a minimum both the work time and the number of operators that have to be present. The cutters on the cutter head break the rock without abrading it, thus limiting the formation of dust and therefore its dispersion in the environment.
Traditional excavation using explosives
This is used in the more complex mountain sections. This technique involves making holes in the rock wall which are then filled with explosives and subsequently ignited. After the debris are removed, the front is consolidated with beams and sprayed concrete. In some cases, the shell can be reinforced with steel bars.
Traditional excavation using pneumatic drills
Where the rock is less resistant and explosives cannot be used, progress is made using pneumatic drills, with the excavation again being consolidated with beams and concrete.
Building information modeling (BIM)
TELT has opted to use the innovative BIM – Building Information Modelling – computer technology, which represents a revolution in the field of project management.
BIM is a data analysis and communication tool linking the different professionals involved in a project and used to facilitate cooperation, simulation, and continuous improvement throughout the entire life cycle of the infrastructure. The integration and updating of information (architectural, structural and plant design, characteristics and properties of materials, components and systems, planning of construction phases, timing and execution costs, maintenance works), allows to monitor the overall process, helping to speed up the construction process, making it cheaper, more reliable and less prone to errors or risks.