July/August 2022 - 83

FEATURE ARTICLE
early 1980s for a range of offshore
applications - predominantly as
anchors for floating offshore structures
- where they are " the most widely used
anchor types for deep-water mooring
applications " (McCarron, 2011). Suction
buckets, installed using pumps that
generate suction forces by creating a
pressure difference between the inside
and outside of the bucket, allow for the
installation to be undertaken with
minimal noise and without the use of
mechanical force. Therefore, a key
difference between suction-installed
foundations and other foundation types
is that the installation design, which
must consider the soil type, soil
strength and installation specific risks
(for example, soil stratification with
significant differences in permeability)
may have a direct influence on the
dimensions of the foundation.
While the number of SBJs installed
for offshore wind applications has
increased significantly in recent years,
the installation process for SBJ structures
is yet to become standard practice
and is considerably more complicated
than the installation process for monopiles.
This paper provides a brief
Suction Bucket Installation
With the advancement of offshore wind
farm projects towards deeper waters and
larger wind turbine generators, foundation
solutions other than the monopile
have received increasing attention over
the past 5 years. Monopiles are the most
commonly used foundation solution for
offshore wind turbines, with 82% in
European waters founded on monopile
foundations (EWEA, 2019). However,
2018 saw a record number of suction
bucket jacket (SBJ) structures, which
consist of a three-legged jacket supported
by a suction bucket at each leg
(Figure 1), installed for offshore wind
applications. SBJs have now been
installed successfully at the Borkum
Riffgrund 1, Borkum Riffgrund 2 and
Aberdeen Bay offshore windfarms.
Suction-installed foundations,
referred to in this paper as suction
buckets, suction caissons, suction piles
or suction anchors, have been widely
used in the offshore industry since the
AUTHORS Avi Shonberg, Michael Harte, Amin Aghakouchak and Morten Albjerg Liingaard, Ørsted
DEEP FOUNDATIONS * JULY/AUG 2022 * 83
Figure 1: Suction bucket jacket structure

July/August 2022

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