Today this is the only tunneling machine in operation in Spain
The work comprises the delivery of two parallel single-track tunnels of the Madrid – Galicia High Speed Line with a length of 6,700 meters each, excavated by a rock TBM. Eje Atlantico, FCC Construction has completed more than 99 kilometers, developing singular projects such as the tunnel or tunnel Bolaños Vigo -Das Maceiras.
The work comprises the delivery of two parallel single-track tunnels with a length of 6,700 meters each, excavated by a rock TBM
External works consist of two twin viaducts of 41 meters each, two overpasses and six longitudinal drainage works and a 5 m2 free section under the platform. The project includes the construction of 18 communication galleries between the two tunnels.
Adjudicated sections are located in the village of Campobecerros within the municipality of Castrelo Do Val at 70 km from Orense.
The project works started on 24 August, 2012, after signing the contract. The scheduled completion date is November 2017, with a budget allocation of just over €162 million.
Today the perforation of the second tunnel is underway. With an average of 24.32 linear meters per day. This is two months less than the time spent on the first tunnel
With average yields of excavation at the first tunnel of 19.40 linear meters per day, it has taken 11.5 months to finish. Today the perforation of the second tunnel is underway. With an average yield of excavation to date of 24.32 linear meters per day, it is on target for completion in 9.5 months. This is two months less than the time spent on the first tunnel. In the delivery of the tunnels an R & D + i solution has been implemented based on the application of a stabilisation system in areas of high geological instability.
Interview with Óscar Álvarez Corral. Project Manager
FCC’s experience in building high-speed lines throughout its history is remarkable, how has the company achieved this?
Principally, it is down to the team we have working on these works. They are professionals with extensive experience both nationally and internationally in implementing level tunnels using TBM’s. This is a significant benefit to the construction process.
What implications and environmental protection measures have been taken on the Bolaños Tunnel works?
From the environmental point of view we have implemented several initiatives. This includes the installation of clean point segregation of hazardous waste and transfer points in sensitive areas of the work for non-hazardous waste and valuable waste, which is destined for recycling.
We have also installed a water treatment plant. This is unique along the line. It has a capacity of 80 m³ / h charge of treatment of all process water tunnels.
Today this is the only tunneling machine in operation in Spain. What have been the milestones in the delivery of the work?. Has the company introduced aspects of R + D + i?
There are three factors that have influenced the delivery of the tunnels:
The main challenge throughout the delivery of both tunnels is the geology
– The introduction of the double component backfill the ring. This is a material composed of bentonite, cement and water, with a silicate additive that confers resistance in a short time. The gelatinous consistency that binds the product within seconds of being injected causes differential movement between the rings. This results in a high quality finish.
– The placement of the double joint between segments (inner + outer seal gasket), giving the tunnel greater tightness.
– Finally, organomineral-component injection resins by automated equipment integrated into the TBM treat unstable fronts, and ease the passage of the machine.
What were main challenges in delivering the work?
The main challenge throughout the delivery of both tunnels is the geology.
Excavation boards laminated with a high degree of alteration implementing alternative criteria perforation, appropriate to excavated material and modifying normal operating parameters of the TBM, have made the use of organomineral resins for treatment unstable from the cutting wheel of the TBM fronts.
The company has exported to the international market its experience in building railways and underground lines. What is the future of high-speed lines in Spain and internationally?
The experience and technological knowledge achieved have significantly increased the competitiveness and internationalization of FCC within the rail industry worldwide
At present Spain and China have the largest high-speed networks in the world. The main challenge for the future is finalizing the routes under construction and, in turn, to complete the connections with France, Catalonia and the Basque Country and Portugal through Badajoz.
The experience and technological knowledge achieved have significantly increased the competitiveness and internationalization of FCC within the rail industry worldwide.
Internationally, investment in rail networks is continually growing. Projects such as HS2 (UK), or high speed in California, USA
What is the differential value of FCC Construction lines running high-speed rail?
Our technical expertise, professionalism and adaptation to customer needs position us as a reference company in the sector.
FCC Construction – A company with experience in rail infrastructure
In its 100 year history FCC Construction delivered numerous different types of railway works. This includes all kinds of railway infrastructure and superstructure covering conventional and high speed as well as the renewal of existing lines and construction of new stations and terminals in major cities.
Over 700 km of high speed lines carry our seal
FCC Construction has built more than 35% of all the high speed lines in Spain.
Spain has the largest high speed rail network in Europe, and the second largest in the world. More than 2,200 kilometers of lines have been built, of which more than 700 kilometers carry our seal. FCC Construction has built more than 35% of all the high speed lines in Spain. Thenetwork connect directly to 27 cities and 19 Spanish provinces, and four out of ten citizens have a high speed station within 50 kilometers.
More than 550 kilometers of tunnels built
The company has used over twenty TBMs across these works
FCC Construction has extensive experience in the construction of tunnels of different types (road, rail, metro). The company has used over twenty TBMs across these works, including: TBM Dhafrah and San’ah (Line 5 Riyadh Metro), two TBMs for Line 2 of the Lima Metro, two TBMs for Line 5 of the Bucharest Metro, TBM Tizona (Madrid Calle 30 tunnel), Adelantada TBM that excavated several lines of the Madrid subway (L7-L2-L12-L8, T1-T4 airport), and TBM Virgen del Camino (Pajares tunnels).
By using the latest tunneling technology, and prioritising sustainability, safety, profitability, optimisation of systems and process improvement over the years, we now have an extensive portfolio in tunnel construction. Among the innovations developed by our Technical Services division are the Bovetrans project (domes system for use in road tunnels sunlight); tunnel waterproofing systems affected by high pressures (Pajares tunnels); design and development of cold-resistant concrete; development of a patented installation of ballastless track system in tunnels inside the system; submerged tunnels; DANAE project in which a system of control and regulation of lighting in the tunnel sections is implanted.