Case Study Overview
Southbay Civil Engineering Limited was responsible for the £380,000 upgrade of the Stoneness Lighthouse, on the north bank of the Thames near Dartford Bridge.
Given the location of the structure, the work was carried out from Red7Marine’s Haven SeaSeven jack-up barge which provided a stable platform for the works to take place and was also used to deliver all plant and materials from Tilbury.
At a glance
- Location: Stoneness Lighthouse, Thames Estuary
- Plant used: 400T Haven SeaSeven
- What we did: Southbay Civil Engineering Limited utilised Red7Marine’s Haven SeaSeven jack-up barge to remove and replace an old lighthouse on the Thames Estuary at Stoneness.
CHALLENGE
As a part of the Port of London Authority’s on- going investment to keep the river safe for all user, Southbay Civil Engineering was contracted to upgrade the structure to ensure Stoneness Lighthouse continues as
fit for purpose for years to come.
The project took place between the months of June and October as the lighthouse is located within West Thurrock Marshes SSSI site, a site subject to overwintering birds.
SOLUTION
The initial works involved dismantling the existing structure and its associated services. The lighthouse was dismantled in two sections, the heaviest of which was a 15t single lift performed at a 22m radius carried
out by Q Crane Hire’s 135t CKE1350Gs crawler crane.
The new 11.58m-high lighthouse was prefabricated offsite, with all sections painted using a coating which has an anticipated 15-year lifespan.
Prior to the installation of the new structure, the existing concrete base slab was cleaned of all marine growth and anchor bolts drilled into the deck slab to allow base grillage to be fixed into position.
Due to the tidal environment, all materials were delivered to site by the Haven SeaSeven. The new lighthouse was lifted in two sections at similar weights and radiuses.
The new lighthouse features a marine beacon and solar panel as well as an access ladder with hardwood fenders installed at either side.
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