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Inishbofin Coastal Protection Works

Projects > Civil Engineering (Marine & Coastal) Projects

INISHBOFIN COASTAL
PROTECTION WORKS &
PIER IMPROVEMENT
WORKS,
Inishbofin, Co. Galway.

 Construction of a new 90m long sheet pile pier, 300m long
retaining sea wall in precast and in-situ concrete, the dredging of
approximately 30,000m3 of silt, sand and gravel with deposition
behind the concrete retaining wall and the formation of a slope
between the top of the wall and the top of the existing cliffs.
The work was topped with a precast revetment surface.
Improvement works were also carried out to the existing quay,
including provision of a new slipway.

Because of the location of the project on an offshore island,
significant logistical obstacles had to be overcome, including
extensive off site pre-casting, on site concrete production, and
restricted plant availability. The dredge element was heavily
restricted by environmental considerations, which imposed
severe limitations on the methodology to bring the dredged
material ashore.

To execute this piece of the work L&M Keating Ltd acquired a
unique piece of dredge plant from the USA, (a Versi Dredge
7012), and the dredge material was pumped ashore from the
floating plant. Part of the dredged material had to be dumped at
sea. This dredging was carried out using a back-hoe on a jack
up barge and the material brought to sea via a split bottom
barge.

The existing old pier was refurbished. Works involved the
installation of new pre-cast pier face elements. The existing pier
deck was then refurbished and a new in-situ concrete deck was
constructed. Extensive repairs to traditional stone pier structure
which included replacement of stone elements and re-grouting of
joints.

The existing “new pier” was also refurbished. Works involved the
installation of a sheet-piled wall around the existing pier which
was then tied into the existing structure. This was then in filled
with dredged material and a new concrete deck and steps
constructed. This element was constructed on a design build
basis. A passive cathodic protection system was installed.

The M&E package included the installation of public lighting,
navigation beacons and hydraulic crane.

L&M Keating Ltd executed all piling works by mobilising company
owned resources to the island by barge.
Client Galway County Council,
County Buildings,
Prospect Hill,
Galway.
Consulting Engineers RPS Consulting Engineers,
Elmwood House,
74 Boucher Road,
Belfast, BT12 6RZ.
Value €7m
L&M Keating Ltd, Kilmihil, Co. Clare. www.lmkeating.ie | info@lmkeating.ie
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