The “Extraordinary Accessibility Plan for Cortina 2021” on State Road 51 “di Alemagna” (Province of Belluno) included a set of major infrastructure works to improve access and traffic flow toward Cortina d’Ampezzo, especially in view of major international events (the 2021 Alpine Ski World Championships and the upcoming Milano–Cortina 2026 Winter Olympics). These works included:

• A tunnel about 1 km long that bypasses the built-up area of Tai di Cadore, eliminating direct through-traffic on the SS51 through the town.
• A tunnel about 600 m long (Valle di Cadore bypass) that crosses a mountainous stretch, avoiding hairpin turns and hazardous curves.

Within this context, and specifically for the two works highlighted above, specialist MEP support services were provided covering the following activities:

• Assistance and overall coordination of the works, understood as ongoing review and guidance of the plant/system design activities performed by other professionals/companies/contractors.
• Review of designs already completed, delivered, approved, or pending approval, including analysis of possible further optimizations and verification of bills of quantities and cost estimates.
• Preparation of design variations within already-approved construction (executive) projects.
• Technical validation of supplies, procurement packages, and construction/installation methods.

More specifically, project actions were developed to adjust (bring into compliance) the tunnels’ executed MEP design within the above works program.

The proposed changes stemmed from the need to incorporate regulatory updates introduced by the 2023 revision of standard CEI 64-20:2023, and they also required a review of the cost framework for the MEP works.

The modifications proposed and agreed with the client concerned the tunnel electrical system, with the goals of:

• Providing criteria for the design, installation, and verification of electrical systems so that they do not become an ignition source and, if a fire occurs, do not endanger users through combustion products.
  Ensuring continuity of operation of safety services intended to function during a road incident, whether or not a fire develops.
• Ensuring that the tunnel’s installed systems and subsystems do not create hazards during firefighting operations.

To meet current regulatory requirements, the principal changes made to the existing designs were:

• Engineering and installation of switchgear assemblies and control systems designed to: provide fire and mechanical protection for installations; minimize the placement of equipment and systems along the roadway margins; facilitate maintenance and operational access (safe personnel access to installations); and reduce traffic downtime following incidents.
• Modification and code-alignment of the tunnel’s permanent lighting system.
• Modification and regulatory upgrade of the power supply lines serving safety systems in Zone 0M (low mechanical exposure) and Zone 0P (not subject to thermal exposure).
• Engineering and installation of new fan isolation and control panels to be installed at the tunnel portals.

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