In the excavation of tunnels, the “traditional method” identifies a set of methodologies and techniques whose common element is the prevalence of the human factor over mechanical means, which only play a supporting role and are applied at different moments. This hybrid background results in the need to divide the excavation operation into distinct and sequential phases, using different methods and means.
Usually, the three key moments are: a first phase of consolidation of the soil to be excavated, with which the soil is given better characteristics of homogeneity and tightness on the excavation front, in order to guarantee the safety of the subsequent phases. A second phase, in which the soil and rocks are removed. A third and final phase with the lining of the tunnel, which allows the work to remain stable over time. Depending on the geo-technical characteristics of the soil to be removed, during the three phases, mechanical means are also used, especially in the consolidation process, by means of threading or nailing, or even during the excavation phase, where the use of explosives is not foreseen.
Toto has always worked acquiring the best technologies and embracing the latest innovations available on the market, in order to develop cutting-edge solutions together with its designers and suppliers. In the 80’s and 90’s, Toto Costruzioni Generali developed and implemented traditional excavation technologies, through a constant specialisation and professional qualification of its workers and the use of the most innovative supporting machinery.
With these means and thanks to its tried and tested know-how, Toto has built numerous tunnels, including those that stand out for their complexity, such as the A1 motorway’s Variante di Valico (Val di Sambro, Manganaccia, Puliana, Alteta Tunnel), those along the motorway A3 Salerno – Reggio Calabria (Serralunga, Vetrano, Serrone Tondo Tunnels), on the S.S. 16 Variante Adriatica (Pescara – Francavilla variant) on the S. Silvestro Tunnel and the Le Piane Tunnel, on the E45 Orte – Ravenna and in the Caramanico area (Fontegrande and Caramanico Tunnels).
Experience, avant-guard technology and materials and specialized personnel have allowed us to cultivate a rich and varied construction tradition also in the field of railway works.