1 The Universal Foundation Concept Sren A Nielsen

1 The Universal Foundation Concept Søren A. Nielsen, MBD, Project Manager Lars Bo Ibsen, Aalborg University, Research Professor MBD, brief introduction Development approach Projects • • The bucket foundation Nearshore. LAB Development of UFC Concept philosophy Basic structure Stakeholders Development EOW 2007 • •

2 MBD Offshore Power A/S EOW 2007 R&D company founded in 2001 Present shareholders: * DONG Energy, >50% * Mar. Con * Novasion Subsidiaries: * Nearshore. LAB A/S, DONG Energy 91 % Primary cooperation: * Aalborg University

The challenges 3 v Sites are getting larger v Geological complex seabeds v Focus on reduction of costs EOW 2007 v Focus on handling of risks, e. g. weather window, availability of construction equipment

The project development approach 4 The look in the rear mirror v Only the road you recently travelled v Own experiences (try and error) EOW 2007 v Technology transfer

Development approach 5 Industrialized product development Project development projects • Focus on total supply chain • Coordinated R&D in each link of the supply chain • Active use of feedback Technology transfer EOW 2007 • is not only using a product in a different location • it is adapting technology to new physical environment • it is adapting the organisation culture • it is adapting the knowledge and education

Development approach 6 Projects versus industry in the offshore wind business Project development EOW 2007 Industrial development

7 Barriers for new offshore technology Lag of focus on technology transfer, understanding of the scope References, track record Large scale demonstrations (few pieces, not whole parks) Handling of risk issues Off cause there is always a small risk when you participate in experimental tooth cleaning, but remember, the treatment is a free offer. . . ! EOW 2007 • •

Projects: The prototype for Pos. 1, Frederikshavn 8 EOW 2007 The Ø 12 x 6 m prototype bucket foundation was designed for a Vestas V 90 3 MW turbine placed on 4 m of water. The design is certified by DNV. The bucket was installed in late 2002 and is in normal operation. The structure/soil interaction has been investigated with sophisticated modal analyse equipment.

Projects: The prototype for Wilhelmshaven E-112 9 4, 5 MW turbine positioned 500 m of the coast outside Hochsiel oil installation Water depth: 4 m. Load regime: Moment > 300. 000 k. Nm, vertical load > 11000 k. N, horizontal load > 5000 k. N, foundation weight app. 400 tons. Installation April 2005. Try and error. Our conclusion: The installation was jeopardized by a impact of the auxiliary vessel during operation outside the predicted window. EOW 2007 Learning: Plans and procedures to be followed

Projects: 10 The test site, Frederikshavn 25 MW, 5 km of the coast Demonstration of: 6 different ” 0 -series” turbines 6 different foundation concepts Cabling Scour protection Access systems Approval for construction: June 2008 EOW 2007 Power system adaptation

11 UFC philosophy, a framework for project development The UFC is a concurrent process, adding new processes and experiences to a database, used by a configuration methodology to produce the required documentation in each step of the wind farm projects focusing on: EOW 2007 • The optimal foundation for each turbine position • Design is parameter driven • Structure based on scaleable modules and elements • Production based on series or mass production • Installation in widest possible weather window • Installation based on common available vessels

12 EOW 2007 The UFC framework

13 Offshore wind turbine foundations The flexibility of the bucket foundation gives wider range of application. Sites with complex geotechnical properties can be cover by a single foundation concept Bucket Mono pile Tripod EOW 2007 Platform

14 UFC basic foundation principle EOW 2007 The bucket foundation (B) is a hybrid combining features from the gravitation platform (A) and the mono pile (C)

15 Bucket foundation Main objectives • Cost reduction, reduction of steel consumption, rational production, smaller installation equipment, reduction of load regime. • Risk management, availability of vessels, weather window, seabed condition. • Going from “one off” offshore construction to industrialized product, EOW 2007 optimised design at each position, parameter driven design, standardized construction elements, standardized installation procedures.

16 Bucket size variations 10 m 20 m 30 m 40 m 12 x 12 m 13 x 13 m 14 x 14 m 15 x 15 m EOW 2007 Different foundation depth with the same wind turbine load. 1: 1 buckets increases load taking with (D=diameter) 4.

17 Bucket size variations Different penetration depth due to soil condition with the same wind turbine load. Uniform soil er lay EOW 2007 18 x 9 m rd Ha 14 x 14 m

18 UFC development Stakeholders / network • Aa. U: Research professor, 4 Ph. D. s • Nearshore. LAB • DONG Energy • Wind turbine industry • Construction industry • Certifying parties Cooperation EOW 2007 • Consultants

19 UFC development projects Status Design methodology for bucket foundations, 2001 -2002 Prototype reference bucket Frederikshavn, 2002 Prototype reference bucket, Wilhelmshaven 2005 Soil/structure interaction I, integration in FLEX 5 / HAWC 2 Scour protection in connection with bucket foundations Dynamic behaviour of suction caissons, Ph. D Thesis 2003 - 2007 Static behaviour of bucket foundations, Ph. D. Thesis 2003 - 2007 Soil/structure interaction II, large diameter mono piles 2007 - 2009 On going Physical & numerical modelling of mono piles in silt Ph. D. 2007 – 2010 On going Offshore installation with Mobile Met Mast bucket foundation, Nearshore. LAB, Horns Rev II, UK sites, 2008 On going EOW 2007 Description

20 UFC development projects Description Status Full scale demonstration bucket i Nearshore. LAB, 2008/2009 Application UFC system development, Ph. D. 2008 -2010 Planning High tension concrete composite in support structures, Ph. D. 2008 - 2010 Planning Scour protection dynamics, Ph. D. 2008 -2010 Planning Advanced probabilistic geotechnical site assessment , 2008 - 2010 Application Probabilistically modelling of offshore wind farm foundations, 2008 - 2010 Application Planning EOW 2007 Geotechnical site investigation with mobile bucket foundation, 2008

21 Future UFC development projects • Transport and installation system EOW 2007 • Scanning of penetration path for objects , e. g. stoner, boulders • Penetration methods in harder soil and soil anchors • Main foundation structures in high tension concrete composite • Sub structures in industrialized design

22 EOW 2007 Thank you for your attention