Tripile Support Structures

Article published on Wednesday, 05 June 2013

The tripile structure is a three-legged jacked structure in the lower section, connected to a monopile in the upper part of the water column, all made of cylindrical steel tubes. The base width and the pile penetration depth can be adjusted to suit the sites geological conditions.

The tripile has been developed by BARD, being the first manufacturer in using this type of foundation. The first installation was in 2008 in the turbine at Hooksiel demonstration site. Each tripile contains 1,100t steel and comprises three individual tubular steel piles set apart and a transition piece. The piles are rammed into the seabed with the help of a special guiding frame. Next, they are joined together by the transition piece which is placed on top and which has at its centre, a connection flange for fitting the wind turbine steel tower. The piles and transition piece are then permanently bonded by a grout connection. The length of the piles varies with the water depth. They range from 65-90m long and up to 3m in diameter.

The water depths for the tripile range from 25-40m according to DNV.

BARD Tripile Structure

BARD Tripile Structure

The tripile has already been used at BARD Offshore 1 wind farm and it is planned to be installed at Veja Mate and Clearcamp offshore wind farms, developed by BARD.

References

Offshore Standard: ‘Design of Offshore Wind Turbine Structures, DNV-OSJ101’, Det Norske Veritas (2010) Project UpWind BARD Engineering GmbH

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