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Seacore Installs Scilly Isles Navigation Day Mark
01 May 2002
Specialist marine civil engineering and geotechnical drilling contractors Seacore has completed the design and installation of a navigation transit day mark on the Tins Walbert rock outcrop on the northwestern extremity of St Agnes in the Isles of Scilly.
The day mark, for client Corporation of Trinity House, is a painted and reinforced masonry wall anchored down to the granite outcrop and one of several projects to aid navigation in the area.
Due to the project's remote location, Seacore used its own jack-up platform Skate IV, which was towed to the location and jacked up on the Tins Walbert rock outcrop to a suitable working height.
The platform was used as a self-contained access and working platform, storing all the necessary plant, equipment and materials needed to carry out the works without needing to be re-positioned.
With the platform in position, Seacore first cast and anchored a concrete foundation ground beam directly onto the rock outcrop. This was followed and topped with a 6m wide reinforced masonry wall, shaped like the gable end of a building, with a ridge height of 7m.
The northwesterly face was painted a brilliant white with a central vertical black stripe from the base to the ridge, allowing the day mark to be clearly visible for a distance of 8 km.
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