Martina (tunnel boring machine)

Short description: Tunnel boring machine

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]

## Contents

* 1 Specifications and operations
* 2 See also
* 3 References
* 4 External links

## Specifications and operations

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 also

* List of longest tunnels
* List of long tunnels by type
* List of mining companies

## References

1. ↑ "A Herrenknecht giant reaches its target". 17 May 2016. https://www.herrenknecht.com/en/media/press-information/2013/a-herrenknecht-giant-reaches-its-target.html.
2. ↑ "TBM Martina ended Sparvo tunnel - tunnelbuilder.com News". http://tunnelbuilder.com/News/TBM-Martina-ended-Sparvo-tunnel.aspx.
3. ↑ "Significant breakthrough at Sparvo - TunnelTalk". http://www.tunneltalk.com/Sparvo-project-Italy-29Jul2013-Final-breakthrough-proves-mega-TBM-method-alternative.php.
4. ↑ "Toto Costruzioni Generali". http://www.totospa.it/en/documenti/comunicati_html/110728_Comunicato_Stampa_avvio_lavori_TBM_per_Galleria_Sparvo.html.

## External links

* tunneltalk website
* tunnelbuilder website

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