Detalhes do Projeto

MARÃO TUNNEL – DESIGN/BUILD CONTRACT

Client: Infraestruturas de Portugal, S.A.
Location: Vila Real – Portugal
Conclusion Year: 2016

The contract comprised a set of studies / projects and works that enabled the completion, together with the adjoining contracts, of the interconnection and commissioning of the whole A4 motorway.
In addition to the predominantly underground works, which completed the two one-way passages, each about 5.7 km in length, section type 107 m2, 9.80 m height, 11.4 m wide, 6.55 m radius and 13 emergency cross-passages, the Active Safety Equipment and Systems should be highlighted for their complexity and importance.

Activities / Works / Systems:

• Completion of the excavation of the tunnels and emergency passages;
• Waterproofing and final lining inside the tunnels;
• Instrumentation and observing systems;
• Drainage networks;
• Technical road channel;
• Sidewalks;
• Fire doors in the emergency passages;
• Paving of the tunnels, portals and accesses;
• Signalling and safety equipment;
• Active safety equipment and systems:
  • Automation and technical management;
  • Ventilation and smoke control;
  • Gravitational firefighting network;
  • Lighting;
  • Signs and information for users;
  • Sensors and automatic detection;
  • Traffic management and supervision;
  • Communications;
  • Support and intervention in the event of emergencies;
  • Technical buildings (3 un) – one of which is the control centre;
• Landscaping and enclosures.

Relevant Quantities:

Underground excavation: 400 000 m3
Blasting: 1 000 un
Landfills: 100 000 m3
Shotcrete: 60 000 m2
Expandable rock bolts: 52 000 m
Steel rod: 6 750 ton
Concrete: 300 000 m3
Waterproofing membrane: 280 000 m2
Generator sets: 4 un
Transformer stations: 3 sets
SOS stations: 93 un
Fibro laser cable: 12 km
Environmental sensors: 30 un
Loudspeakers: 469 un
CCTV cameras inside the tunnel: 117 un
Fans: 46 un
Electrical cables: 275 km
Fire hydrants: 66 un
PVC piping: 275 km
Bituminous pavements: 53 000 ton