Emergency Repair of the Breakwater – Stage 3

The third and final stage of the reconstruction of the North Breakwater of Praia da Vitória Bay, a contract that the US Navy had awarded to Seth, on November 1, 2007, was concluded in March 26, 2009.

The job in question, budgeted at about € 8.5 million, took 15 months (3 months ahead of the date scheduled by the customer) and it involved the following tasks and quantities:
– Conclusion of the protection crown (30 metres wide) around the head, involving application of 19,300 tonnes of rock-fill of between 8 and 22 tonnes;
– Reprofiling the body of the breakwater over a distance of 540 m and application of 66,300 tonnes of rock-fill of between 2,5 and 8 tonnes used in the construction of the protection mantle along the inner side of the breakwater;
– Pre-fabrication of 392 C60/75 concrete Core-locs reinforced with 50mm synthetic-fibre;
– Placement of 516 new 33-tonne Core-locs;
– Shifting and replacing 100 existing Core-locs;
– Shifting and replacing 120 Antifers each of 20 tonnes;
– Concreting the superstructure of the head and placement of the Port of Praia da Vitória approach light having a visual range of 10 nautical miles.

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NOTE: The world’s largest CORE-LOCS ® at the time of this work.

Equipment used
1 Crawler crane, 350 tons
1 Crawler crane, 250 tons
1 Hydraulic excavator, 60 tons
3 trailers, 40 tons
1 Wheel Loader Komatsu WA600 (60 ton)

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