The Spanish Herrenknecht branch managers Francisco Avila Aranda and Juan Arroyo mentioned several factors to explain the speedy progress in the tunneling activities: the experienced construction site team of FCC Construcción S.A. and Construcciones Sanchez Dominguez-Sando S.A., the logistics system which was planned in detail and the tunnel boring machine which was precisely adapted to the geology consisting of hard limestone. Furthermore, the construction site team, excellently trained and coordinated by the construction company and the perfect logistics system contributed to this extraordinary performance.
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