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  Widening the “Montedomini” tunnel in the presence of traffic: the evolution of the “Nazzano” method

  Widening a motorway tunnel in the presence of traffic without resorting to alternative routes or reductions in the level of service was attempted for the first time in the world in the early 2000’s to widen the Nazzano Tunnel (A1 Motorway , near Rome). Completion of that project constituted without doubt a true milestone for tunnelling. It demonstrated the feasibility and efficiency of the method, which by reducing land consumption to a minimum, made it possible to expand the capacity of strategic road, motorway or rail infrastructures without reducing the level of service during construction operations. The solution to widen the existing tunnel without interrupting traffic had now become a reliable and advantageous option for clients where possible alternatives (driving a third tunnel or closing traffic in the carriageway to be widened) can be more financially and socially costly than widening the existing tunnel. Naturally the technologies adopted to widen the Nazzano tunnel reflected the knowledge available at the time of construction. Hence the adoption of a single multifunction machine able to carry out both ground improvement work and operations to line the tunnel. This was the result of prior experience acquired during the construction of a Station on the Rome Metro. At a distance of 10 years, the availability of new technology for a new project to widen a motorway in the presence of traffic (Montedomini Tunnel, A14 motorway, near Ancona) has made it possible to make higher performing choices, while maintaining the general approaches and construction technologies adopted for the Nazzano Tunnel. After first reviewing the main concepts and potentials of widening a tunnel in the presence of traffic using the Nazzano Method, this article illustrates how the method has evolved today on the “Montedomini” site, where the introduction of innovative solutions and machinery will allow significant progress to be achieved in tunnel widening technology.

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