FCC Construction has completed boring on the 6.7km long, 9.9m diameter twin Bolaños rail tunnels on the Madrid-Galicia High-Speed Line for client, Adif Alta Velocidad, the rail infrastructure administrator for Spain.
A Herrenknecht S-511 single shield TBM has been used to construct the two tunnels through ground conditions consisting of shales, quartzite, phyllite and sandstones. Advance rates on bore 1 reached 19.4m per day and took 11.5 months to finish, whilst bore 2 achieved 24.32m per day with a construction period of 9.5 months.
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The tunnel was lined using precast segments 370mm thick and 1,600mm long.
Carlos M. Jarque, CEO of FCC Group, said: “FCC Construction has built up extensive experience and technical knowledge in transport infrastructure. This has increased the company’s competitiveness and internationalisation in the rail sector”.
The full line is expected to open in 2018.
A video of the Bolaños Tunnel can be viewed here: