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Gerede Water Transmission Tunnel breakthrough

Gerede Water Transmission Tunnel breakthrough

The Gerede Water Transmission Tunnel in central Turkey has been designated a national priority due to chronic drought conditions in the capital Ankara. The water supply line is 31.6 km long and draws water from the Gerede River and it will be the longest water tunnel in Turkey once complete. It is being built by the Kolin/Limak joint venture and on the 19th of December 2018 the 5.56 m diameter Robbins Crossover XRE TBM broke through in Ankara, Turkey

The TBM was designed for ease of conversion between hard rock and EPB modes. Dozens of fault zones and intense water pressures up to 20 bar are just a couple of the challenges the TBM had to overcome.

Prior to Robbins involvement, three standard Double Shield TBMs, originally supplied by another manufacturer, attempted to bore the tunnel.

Of the three, two became irretrievably stuck following massive inflows of mud and debris. In 2016, a Robbins Crossover XRE machine was launched to excavate the final 9 km (5.6 mi) of the 31.6 km (19.6 mi) long water supply tunnel. For further information on the project click here and http://www.therobbinscompany.com/projects/gerede-water-transmission-tunnel/   and visit http://www.therobbinscompany.com. 02/19.