Multi-role vessel STOUR is on charter for Marine Civil engineering contractors BAM Nuttall in Brighton where work is underway to construct a temporary sheet piled cofferdam inside the entrance to Brighton marina to enable the construction of a new large block of flats - part of a massive redevelopment of the area.
STOUR was loaded with a 25t long reach excavator in Poole, at Jenkins Marine yard, and steamed to Brighton. She was then precisely positioned using her self elevating spud legs and the excavator is now being used from her deck to excavate a trench within which the sheet piles will be driven. The sheet piles will be driven as a double wall, about 10m wide, which will then be filled with marine dredged sand & ballast. This makes it essential that the overburden of silts be removed in advance.
Once this element is complete, the excavator will be tracked off STOUR on to the adjacent foreshore, enabled by STOUR’s ultra-shallow draft (less than 1m at the bow). A Jack-up barge has also been mobilised from nearby Shoreham port for the construction of the sheet piling. STOUR was also used to assist the arrival and positioning of the jack up, and will be able to move and re-position it as work progresses, using her own spud legs to secure her location, while waiting for the jack up to lower her own legs.
STOUR’s impressive 75t deck cargo capacity will also be used to full advantage to supply the jack up with sheet piles and other materials as works continue and her 65t/m remote control deck crane with 3t winch has also already come in useful to assist loading and unloading of construction materials.
A larger 35t excavator with hydraulic grab may also be put on to the STOUR to move some large 6t concrete blocks on the foreshore to help save time draining the jack up’s resources.
A statement from Brighton Marina says:
"This is one of the most exciting developments in the history of this vibrant city, it presents a rare opportunity to experience marina life amidst all the advantages of Brighton’s rich heritage."