This Design and Construct scheme was for the construction of a new berthing facility at the Port of Mostyn in North Wales.
The Scheme consists of 3 main operations; Dredging and Reclamation, the Riverside Berth Extension and a new Ro-Ro Berth and Linkspan installation.
The Dredging operation was carried out in the River Dee in the approaches to the Port of Mostyn and was required for two reasons; to improve the existing navigation channel and turning area and to provide reclamation fill to the new Riverside Berth Extension.
This element of the scheme involved an extension to the existing Berth by a further 190m and a return wall to tie into the revetment at the new Ro-Ro Berth end. The wall was of "Combi Wall" Construction and consisted of 1520mmØ x 31m long steel tubular piles. They were installed using a combination of both vibrating and hydraulic drop hammers along with a custom designed piling frame and all of which was undertaken using floating plant. The main wall connected to a parallel anchor wall with 100mmØ tie rods. The anchor wall consisted of a series of individual 1168mmØ steel tubular piles.
The reclaimed dredged material required further ground improvement and vibrated stone columns were installed. These were single columns, 1200mmØ x 20m deep, installed at 1.1m centres. In total some 2295 columns were installed.
Quay furniture including mooring bollards, safety ladders and floating pneumatic fenders were installed to the extension and a 20m wide block paved apron with drainage, water service and lighting was constructed around the perimeter of the wall.