Intelligent systems for the A3 Salerno – Reggio Calabria motorway
- Principal I Macro-lot: CMC Soc. coop.
- Principal III Macro-Lot: Siemens Spa
- Principal V Macro-Lot: Sa-Rc Scarl
- Principal VI Macro-Lot: Rc-Scilla Scarl
- End customer: Anas SPA
- Works carried out: Electrical, lighting and SOS, fire prevention, ventilation systems. Radio systems, messaging systems to vehicular traffic (variable message signs and lane control signs), supervision and control system
The PSC Group participated in the execution of the work as a system installation company (1st, 3rd, 5th and 6th macro-lots) for a total of about 80 km in each direction of travel.
In the 5th macro-lot – with an extension of about 30 km, between the exits of Gioia Tauro and Scilla – there are 12 natural tunnels and one artificial tunnel with 24 viaducts and bridges and 2 exists in-between. The tunnels alone, all of the two-way unidirectional type with emergency lane, have an overall extension of about 28 km.
The tunnels are equipped with the best safety systems that meet the minimum requirements for motorway tunnels laid down by L. Decree 626/06 and the related ANAS guidelines.
Intelligent tunnel plant engineering system
The designers of the PSC Group directly assisted the customer’s technical offices to define the construction project and to implement the latest generation of technological equipment capable of guaranteeing functionality and safety.
The plant engineering system of this intelligent tunnel is equipped with decision-making autonomy:
- it monitors the essential parameters through detection sensors in the environment and it interacts with these, checking that the fundamental values remain within the predetermined functional range
- it intervenes immediately during the early stages of a critical event, such as an accident, a fire or an excess of fumes and pollutants in the environment.
Pending the arrival of the rescue teams, the tunnel system is able to autonomously activate safeguard scenarios, managing the fans in number and direction of thrust, the level of lighting, the indication of the escape routes and of safe places, and signals to users through graphic and alphanumeric indications concerning the type of event. In the most critical conditions, the system also handles the traffic lights placed at the tunnel entrances, and even prevents users from entering the tunnel.
The rescue operators are automatically alerted by the tunnel system, or by a user through the SOS cabinets, and can manage the radio communication, fire extinguishing and fan control systems.
Overall, the following were installed:
- 308 axial fans along the twelve tunnels
- 128 fans for air intake from safe places (by-pass)
- Over 200 electrical panels in twelve cabins
- More than 2,200 km of copper and aluminum cables, 30 km of radio cable along the vaults of the tunnels
- 30 km of HDPE fire hose
- 100 Km of ducts in AISI 304 steel along the vaults of the tunnels and 70 Km along the footbridges of the tunnels
- 100 km of three-tube
- 12,000 led lighting units and over 7,000 high pressure sodium (HPS) lamps
- 10,000 luminous observation windows
- 300 lane control signs
- 40 variable message signs
- 400 km of corrugated pipe.