Work platform


Boat landing Shaft


Internal J tubes


Scour protection Suction caisson Skirt


Conical Transition


Intermediate platform Transition


External J tubes Grouted connection Monopile


Diagram 5.5. Typical suction caissons 35.


Diagram 5.6. Typical monopile structure


Foundation types would be selected following detailed design, based on suitability of the ground conditions, water depths and wind turbine models. There may be only one type, or alternatively a combination of foundation types may be used across the East Anglia THREE site.


36.


At this stage, the preference is to consider locations with water depths of 45m or less. However, for the proposed East Anglia THREE project it may be necessary to build at locations with greater water depths, possibly up to 49m(relative to LAT). There are no areas within the East Anglia THREE site deeper than 49m (relative to LAT).


37. 38.


The platform on top of the foundation is likely to be up to 14m above sea level (relative to LAT).


The foundations would be manufactured onshore and delivered to site as a fully assembled unit with all secondary structures attached. Piles, if required, would be installed separately and attached to the main structure at the offshore location.


39.


Fabrication, construction methods and requirements would all differ significantly depending on the foundation type selected.


5.4.4.1 Jacket foundations 40.


There are many variants of the jacket structure but there are three main categorisations:


 Pre-piled or post-piled;  Three-legged or four-legged; and


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 5 Description of the Development Page 11


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