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Sochi sea outfall tunnelling sets new record

Utilities tunnelling work for the 2014 Winter Olympics site in Sochi has set a new record for tunnelling boring machine (TBM) rates Herrenknect has said today.

Russian contractor Zao Priss used a Herrenknecht AVN2000 TBM to install over 2km of pipes for a new sea outfall in 100 days with performances of up to 27m per day achieved.

Herrenknecht has said that this rate of work “constitutes an unprecedented record in the DN 2000 (2.5m) diameter range”.

The new outfall pipe connects with a new wastewater treatment plant being built in the Sochi district of Bzugu. The TBM was launched from a 25m shaft and has been used to build a pipeline, through highly abrasive limestone, to a discharge point located 800m off the coast.

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