Pigra Engineering is greatly renowned in the tunnels and underground works areas, especially in railway, subway, roads, hydraulics and quarries projects. We have delivered project designs and specialised designs, site supervisions and technical assistances.


We also undertake auscultation and monitoring control of the structure during project commissioning and operation phases, using state of the art technology like drones and satellite remote sensing. Our highly skilled staff ensures an integral service to our clients, providing geotechnical solutions as well as fully detailed analysis.


Pigra Engineering also provides its knowledge in new technologies and materials in the fields of tunnel illumination, installations, safety and operation.


Internationally, Pigra Engineering collaborates in the preparation of standards for Tunnels for Governments in Latin America.


Some of our projects:

Abrera and Cardedeu water treatment plants connection

Tunnel connection between the Abrera and Cardedeu water treatment plants. 

Fontsanta-Trinitat stretch. Project design.

Client: ATLL.

New C-25 road tunnels construction

Technical assistance to the client in the construction of the "Eix Transversal" road tunnels. Vic to Girona stretch. Fontfreda, Bruc and Romegats tunnels, among others.


Client: Cedinsa

Montant de Tost tunnel construction

Site Supervision in the construction of the "Montant de Tost" C-14 road tunnel. Organyà to La Seu d'Ugell.

Client: GISA

Vallirana tunnel


Technical assistance to the client in the construction of the tunnel of the Vallirana road bypass.


Client: Ministerio de Fomento.

Barcelona's subway portfolio


Pigra Engineering has worked in several projects for the modernisation and extension of the Barcelona subway network. Our most relevant projects are:


  • New Barcelona underground L5 line station between Collblanc and Pubilla Cases. Site Supervision.

  • Construction of the new Can Vidalet station access of the Barcelona underground's L5 line. Site Supervision.

  • Technical assistance to the client for the construction of stations of the new L9 line of the Barcelona underground.

  • Extension of the FGC underground S5 line in Terrassa. Design of infrastructure, superstructure and electrification.


Clients: Infraestructures.cat, TMB, FGC, Ajuntament de Barcelona

Tunnels inspection and auscultation


Long term contracts for the inspection and auscultation control of the Vallvidrera, Bracons, C-32 road and Cadí tunnels, among others.


Clients: Abertis, Tabasa, Direcció General d'Infraestructures de mobilitat

Tunnels lighting design and renovation


Renovation of the ventilation system and implementation of a LED illumination system in the Bruc tunnel.

Design of the illumination of the Nou del Berguedà tunnel.


Clients: Infraestructures.cat, Abertis, Tabasa, Ministerio de Fomento

UTE Glòries Technical Assistance


Technical Assistance to the Joint Venture company building the new urban tunnel in Glòries Square, Barcelona.


Client: Private client - UTE Glòries

Tremp to La Pobla tunnel construction


Site Supervision for the execution of the new tunnel for the C-13 road.


Client: Infraestructures.cat.