In accordance with the client's needs and requirements, 3TI develops appropriate solutions to ensure safety, durability and maintenance in line with standards set by current legislation. We design enhanced infrastructural strategies which take into account the relative laws and regulations, environmental and landscape constraints, and all other local conditions that may affect design, financial and executive decisions.
Plant engineering design to service tunnels specifically concerns the lighting system, electrical room, ventilation system, surveillance system and command center, fire detection and extinguishing system, traffic control system, grounding system, radio and CCTV, illuminated signals and non-illuminated signage, SOS telephone system, fiber optics etc – replacing traditional energy sources with renewable wherever possible.
To design natural tunnels, 3TI employs structural characteristics and operational methodologies which can be divided into several phases. Once the design framework for geological and geomechanical work is defined – identifying any additional geotechnical investigations to be conducted during the design phase – we proceed to analyse all design considerations and to define the behaviour of the excavation massing, depending on the geological and geomechanical framework and advancement geometries.
Via dedicated multicriteria probability modeling software, we conduct detailed risk analysis in order to determine the most appropriate excavation method. This selection process takes into account the time required and relative construction costs for each type of excavation, based on the different types of rock masses encountered. The study permits us to assess the risks associated to incomplete definition of the parameters defining the geomechanical behavior of soils and rock masses, allowing us to identify characteristics to minimize these risks, relative to each excavation method. Once the advancement typology and planned operations have been defined, an appropriate monitoring system is selected in light of the excavation methodology (traditional or mechanized), in order to check work in progress. Finally, once typical tunnel sections have been designed and developed, we investigate any sections that are oversized with respect to the typical sections (widening the gallery for travel visibility and lay-bys).