Per Aarsleff A/S has been involved in offshore wind since the industry’s infancy and has taken part as EPCI foundation contractor in some of the most significant projects including the offshore wind farms London Array and Rødsand 2. Our Offshore Wind & Special Marine Projects department specialises in the design, fabrication and installation of concrete structures, and we are producing gravity base foundations (GBFs), concrete working platforms and concrete transition pieces at our fabrication yard in Swinoujscie, Poland.
Reinforced concrete is a robust and durable material with a proven track record of 25 years in the harsh offshore environment. It was used as the primary construction element (GBFs) on the very first large-scale wind farms including the Nysted Offshore Wind Farm, and the low operation and maintenance cost is well documented.
In addition to being superior to the steel alternatives with regards to operation and maintenance, another major advantage with concrete solutions compared to steel alternatives is that the concrete prices are stable whereas the steel prices fluctuate significantly thus adding risks and costs to the project.
The Aarsleff GBF has no grouted or bolted connection in the primary foundation structure, and the concept is recognised as a robust and low-risk solution by the leading certifying authorities.
The installation process does not require large penetration of the seabed and does not generate noise from piling, allowing the GBF to be installed without any risk of harming the marine life.
In addition to being specialists in offshore wind concrete structures, Aarsleff has an extensive track record in MP/TP projects, and we are involved in complex and unique offshore wind activities. We have carried out repair works on the Amrumbank Offshore Wind Farm, and in 2017 we are to install the innovative gravity jackets on the Nissum Nearshore Wind Farm.