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Danish wind farm focuses on quiet construction

Construction of Dong Energy’s Anholt offshore wind farm – Denmark’s largest wind development - is using vibro piling technology to minimise the impact of the work on marine life.

Monopiles for the 400MW development, covering an area of 88km² between Grenaa and the island of Anholt, are being installed using three 200HD PTC vibrodrivers in place of conventional hydraulic hammers.

According to PTC, an impulsive acoustic energy is created upon impact with conventional methods, which can create sound waves that travel over several kilometres and put marine life at risk.

The project is using 275t monopiles of conical shape with a bottom diameter exceeding 5m installed by the PTC hammers working from a barge owned by Ballast Needam.

So far the work has gone well with the piles being installed into the dense sand and compact silty sand in less than the 30 minutes demanded by the contract. 

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