suction caisson. If this foundation type is adopted, detailed work would be required pre-construction to determine preparation required for each foundation. Ground preparation requirements in terms of the maximum volume of excavation would be less than that required fromgravity base structures.
5.4.4.3.3 Installation method for suction caisson foundations 96.
Suction caisson foundations are most likely to be towed to site by tugs as they are designed to be buoyant. The caisson skirt and shaft are generally delivered and installed as a single part.
97. The overall basic installation methodology would typically be as follows:
Confirmation investigation of sea bed to ensure no obstructions are present (this would be on-going throughout the installation process);
Prepare sea bed (if necessary) prior to installation; Suction caisson foundation towed to site via barges; Suction caisson foundation is ballasted and lowered to sea bed; Initial penetration occurs under foundation self weight;
Pumps are attached to caisson and water evacuated. Typically there are a number of chambers within the caisson in order to implement a controlled installation and to control levels. Water jetting may be used at the tip of the skirt to facilitate penetration;
Install scour protection (likely to be rock dumping); and Spoil removal and disposal for suction caisson foundations.
5.4.4.3.4 Type of scour protection for suction caisson foundations 98.
Scour protection would be provided around the installed suction bucket. The requirements would be similar to those listed for gravity base structures above. The quantities and extent of scour protection would be dependent on current speed, sediment type and the foundation details.
99.
As for gravity base structures, if this foundation type is adopted, detailed pre- construction work would be required to design the scour protection for each foundation.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 5 Description of the Development Page 22
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