The Martina tunnel boring machine is a hard rock tunnel boring machine built by Herrenknecht AG. It is the largest hard rock tunnel boring machine in the world and has been used for drilling the Sparvo Tunnel, a part of the larger Variante di Valico project in Italy.[1]

Specifications and operationsEdit

The Martina has a shield diameter of 15.55 metres, an excavation diameter of 15.62 metres, a length of 130 metres, a total weight of 4500 tonnes and an annual operating consumption of 62 million kWh. The machine started work on the Sparvo tunnel in 2011, with drilling of the 2430-metre north tube completed in 2012. The drilling of the 2600-metre south tube was finished in 2013, bringing the 5-kilometre tunneling project to an end.[2][3][4]

See alsoEdit


  1. ^ "A Herrenknecht giant reaches its target". 17 May 2016.
  2. ^ "TBM Martina ended Sparvo tunnel - News".
  3. ^ "Significant breakthrough at Sparvo - TunnelTalk".
  4. ^ "Toto Costruzioni Generali".

External linksEdit