SPARVO TUNNEL: TBM MARTINA BREAKS THROUGH THE LAST WALL SETTING A NEW WORLD RECORD FOR MECHANISED EXCAVATION
Castiglione dei Pepoli (BO), 29 July 2013 - Toto S.p.a. Costruzioni Generali reveals that the last wall of the A1 motorway Sparvo tunnel South carriageway (headed to Florence) has been broken through. A world record in mechanised excavation was achieved with a speed reaching ten times that of traditional techniques for a twin-tube tunnel, each tube with a diameter of more than 15m.
What has been achieved today represents a major step towards completion of work on the A1 motorway Valico Bypass, a project that was commissioned by Autostrade per l’Italia. For this project Toto Costruzioni Generali used “Martina”, the biggest Tunnel Boring Machine (commonly called TBM or “mole”) ever to be used, built in Germany.
Toto’s enormous tunnel borer, having completed 2430 metres of work in 11 months in the North carriageway last July, has excavated and lined 2600 metres of tunnel in the South carriageway in just 8 months.
With this speed, “Martina” has set a new record for production:
400 metres of tunnel construction in a month
126 metres in a week
24 metres in a day
The performance of Martina puts Italian construction company Toto Costruzioni Generali among the top in the world in terms of standards for tunnel building with TBM machines.
“Since putting “Martina” to work in July 2011”, says President and CEO of Toto Costruzioni Generali, Alfonso Toto, “in a year and a half we have built the biggest tunnel in the world with a TBM that has a diameter greater than 15m. We knew with Herrenknecht’s “Martina” that we had chosen a custom-built TBM. But if we can celebrate our success today, it is thanks to the ability and expertise of our technicians who drove and managed this machine, a credit we would like to share with our partners and offer both to our client Autostrade per l’Italia and the country.”