The Strandfontein Desalination Project (undertaken for PROXA) has won a number of SAICE awards this year, including a Technical Excellence Award for the Western Cape branch followed by a Best Project Award for the SAICE Western Cape region. Site engineer Lumka September prepared and presented a comprehensive overview of the project, which was very well received by the engineering community, at the regional awards event. Following this win, the project was then submitted for consideration in the SAICE National Divisional Project Awards held on 12 October 2018. It was awarded the Most Outstanding Civil Engineering Project for Marine Engineering, and also received a Highly Commended Award in the Technical Excellence Category.
After working in a remote location in the Republic of Guinea for just under eighteen months, Stefanutti Stocks Coastal completed the construction of an export facility for Alufer Mining. The facility was required to accommodate a conveyor line and a telestacker, that would load bauxite onto individual barges berthed along the quay wall.
Stefanutti Stocks’ scope of work on the facility comprised production of rock from the quarry (located three kilometres from site), to be used for the construction of the 1200-metre causeway, the 190-metre breakwater and the 100-metre-long berthing deck on piles. The scope included the bases and sleepers to carry the telestacker and conveyor structure, as well as the supply and installation of navigational aids (marker buoys, wave rider buoy, weather station, tide gauges and a control centre) and quay furniture (including bollards, fenders and lifebuoy cabinets).
The completed causeway and breakwater consist of 740 000 tons of core material (quarry run) that create the body of the structure and 176 000 tons of armour rock that has been placed on the sides of the core, to protect it from erosion. The design of the armour rock comprised of armour 1: 0.5 to 2.3 tons, armour 2: 2.3 to 6 tons and armour 3: 3.1 to 9.3 tons. Each armour stone was individually placed in a specific order to ensure that the rocks interlocked.
The berthing structure consists of four berthing dolphins that are connected to a retaining wall by precast concrete beams. Precast deck planks have been placed on top of the beams and an in-situ concrete slab was cast over the planks to create a smooth deck for the telestacker. The beams were connected to the retaining wall and the dolphins via shear pins and bearing pads, thus allowing the deck to float. The floating deck accommodates any settlement in the structure.
On Wednesday 30 May 2018 the Strandfontein Desalination Project (undertaken for PROXA) won the 2018 Technical Excellence Award from The South African Institution of Civil Engineering – Western Cape branch.
Through early contractor involvement the Stefanutti Stocks Coastal TAG Diving joint venture and PROXA’s design engineer, PRDW, value engineered the pipe-line configuration to achieve an excellent balance between the design requirements (for the total weight and stability of the pipeline on the seabed), and the practicality of manufacturing and installing this pipeline.
The Stefanutti Stocks Coastal TAG Diving JV undertook the marine scope of work for the desalination plant. A snapshot of the project can be viewed here.
“This award serves as a great way to acknowledge the professionalism and dedication with which the team committed itself to successfully realise the marine works,” says Christophe Baret from PRDW Consulting Port & Coastal Engineers. “Well done team!”
As the winner, the project is submitted for consideration in the same category at national level.