Lynn & Inner Dowsing Offshore Wind Farms

54 foundations on the Lynn & Inner Dowsing sites located on the east coast of England installed by MT Højgaard in 2007.

In 2007, we installed 54 foundations on the Lynn & Inner Dowsing sites located on the east coast of England.

Installation method

The foundation concept is a steel monopile solution with a grouted transition piece installed on top of it, allowing for a standard flange connection to the turbine tower.

Depending on the soil conditions, the installation method of the monopiles was either driving or a combination of drilling and driving.

Pilegripper developed by MT Højgaard

The verticality was adjusted using a pilegripper developed by us. Subsequently, the transition piece was positioned, with all accessories such as boat landing, platforms and anodes pre-assembled, and adjusted by hydraulic jacks.

J-tubes

The connection between the monopile and transition piece was finally grouted, using the patented MT Højgaard grout packer. Finally, internally positioned J-tubes were installed, followed by installation of the external J-tubes. The external J-tubes are spanning the scour which is expected to develop around the pile. The foundation installation was completed in the winter of 2007.