The execution of the Circular Line of the Porto Metro involves a complex and multifaceted project that is subdivided into several main works.

Below is a detailed description of each of the main areas of work:

​

TUNNELS

   1. Instrumentation of Surrounding Buildings and Infrastructures:

• Monitoring and control of vibrations, displacements, and other influences on buildings and infrastructures near the excavation site.

   2. Affected Services and Heritage Protection:

• Identification and protection of public services (water, sewage, electricity, telecommunications) and historical heritage affected by the works.

   3. Reinforcement and Protection Works for Buildings and Infrastructures:

• Structural reinforcement and protective measures to ensure the integrity of buildings and infrastructures during tunnel construction.

   4. NATM Excavation Fronts and Temporary Lining:

• Use of the NATM (New Austrian Tunneling Method) for excavation, followed by the application of temporary lining for stabilization.

   5. Final Lining:

• Application of permanent lining after the completion of excavation to ensure the durability and safety of the tunnel.

​

STATIONS

1.  Instrumentation of Surrounding Buildings and Infrastructures

2. Affected Services and Heritage

3. Protection Reinforcement and Protection Works for Buildings and Infrastructures

4. Excavation and Peripheral Containment:

• Excavation of stations and implementation of containment measures for stabilization.

• Excavation of stations and implementation of containment measures for stabilization.

   5. Structures:

• Construction of the main structures of the stations and their access points.

   6. Water and Sewage Systems:

• Implementation of potable water systems, sewage, wastewater, and rainwater systems, including pumping systems.

   7. Finishes

   Installation, Equipment, and Electrical Systems

​

INSTALLATION, EQUIPMENT, ELECTRICAL SYSTEMS, SIGNALING, AND TELECOMMUNICATIONS

   1. Medium Voltage Power Supply and Substations:

• Medium voltage power supply systems and substations.

   2. Catenary:

• Installation of the catenary system for the power supply of the carriages.

   3. Intrusion Detection and Access Control:

• Implementation of security systems for access control and intrusion detection.

   4. Lighting and Low Voltage Power Supply, Fire Detection and Fighting:

• Installation of lighting systems, low voltage power supply, and fire detection and fighting systems.

• Implementation of railway signaling and telecommunications systems for the safe and efficient operation of the line.

​

RAILWAY

Concrete Track Platform, Multitubulars, Track Drainage, LVT Concrete Blocks, Vignole 60E6 Rail:

• Construction of the railway infrastructure, including the concrete platform, drainage systems, installation of tracks, and specific concrete blocks for track support.

​

This comprehensive project is essential for the expansion and improvement of the public transportation network in Porto, contributing to more efficient and sustainable urban mobility.