Offshore works :
experienced professionals
all over the world

Our teams are leading the consortium appointed by BP to build the gas terminal on the Greater Tortue Ahmeyim field: a docking facility protected by an offshore breakwater. Made up of 21 concrete caissons, each weighing 16,500 tonnes and manufactured by Eiffage in Dakar (Senegal), the 1.2-km breakwater will be laid at -33 m, 10 km offshore. At the same time, the 2.5 million tonnes of quarry material required for the foundation of the underwater seawall supporting the concrete caissons are produced by Eiffage in Mauritania in a quarry opened specifically for the project.

Eiffage Génie Civil Marine, in a consortium with Spie batignolles fondations and the Beninese company Adéoti, has won a design-build contract for the extension of the port basin and several quays, as well as the renovation of the north quays, at the Port of Cotonou in Benin.

The contract is part of the Port of Cotonou's Master Plan for Expansion and Improvement, which aims to strengthen the role of Benin's only port as a driving force for local economic development. By 2025, the port's new infrastructure will be able to accommodate Post Panamax container ships.

Located on Colombia's Atlantic coast, the Puerto Antioquia project is considered by the Colombian government as a priority project of national interest. It is strategically positioned on a major axis for international container transport, close to Medellin, one of the country's main economic zones.
 
The contract covers the design-build of a complete port infrastructure, including an offshore platform - for the simultaneous berthing of 5 container ships - linked by a 3.5-kilometer offshore viaduct and a 320-meter bridge to a 35-hectare fully-equipped land terminal with its own operating buildings and warehouses.

ETMF won the contract in consortium to develop Haliguen harbour in Quiberon.

Construction of 3 quayside surfaces (12,000 m² area) built with dredged materials protected by a double combi-wall.

Harbour activities continued uninterrupted during the works, which amount to 18.9 million euros.

Bordeaux stone bridge in the city centre is a masonry structure built in the early 19^th century. It is 486 m long and comprises 16 piers and two abutments. Each pier is based on 250 pine piles planted in the Garonne riverbed.

ETMF was chosen in consortium to carry out repair and reinforcement work on the bridge’s underwater banks. 

The first stage of the operations involved filling in the pits on the Garonne River bottom caused by strong currents and river traffic, using stone-filled nets installed by waterway. During the second stage, 140-tonne gabion walls (12 m x 12 m) were placed on the underwater banks to limit the effects of weathering over time.

Villeneuve-sur-Yonne dam reconstruction. We first demolished the former port and carried out engineering work. We then fixed check valves, jacks and footbridges, to enable dam refilling within the timeframe fixed by French navigation authority VNF (Voies Navigables de France) before the flood-risk period.

This "jetty" was designed as a series of pure curves for both aesthetic and technical reasons and blends naturally into the landscape. The bridge tops 134 steel poles drilled 35 metres deep, and is covered with precast concrete slabs and oak decking - a mixture which gives the structure its discretion and elegance.

• Length : 756 m
• Width : 11 to 17 m
• Total steel framework weight : 2,000 t
• Client : Syndicat Mixte Baie du Mont Saint-Michel
• Architect : Dietmar Feichtinger

Design and build turnkey contract for a 5.2 million TEU-capacity container terminal adjacent to the Tangier Med 1 and Tangier Ro-Ro projects built by the same consortium.

Scope of works :

• Flood barrier in caissons : 2,835 m
• Embankment dyke : 1,332 m
• Dyke depth up to -35 m LAT

Main quantities :

• 105 reinforced concrete quadrilobed caissons (28 x 28 x 27 m) with average weight of 6,300 tonnes
• Concrete : 450,000 m³
• Steel for concrete and structures : 60,000 tonnes
• Pit-run gravel and riprap : 17.5 million tonnes
• Accropode™ blocks, 4 to 9 m³ : 9 000 units

Design and build turnkey contract for Freetown Harbour container terminal extension.

• Dredging : 260,000 m³
• Backfill : 600,000 m³
• Structural steel : 8,000 tonnes
• Concrete : 12,000 m³
• Road surface structure : 50,000 m²
• Power plant : 6 MVA

Design and build turnkey contract for wharf structure and facilities.

Scope of works :

• 800 m concrete pilework wharf with draught of up to 18 metres
• 25 m steel walkways

Main quantities

• Reinforced concrete piles 1,400 mm in diameter, anchored in the rock by drilling : 536 units
• Concrete : 53,000 m³
• Backfill : 500,000 m³
• Wharf equipment

Design and build turnkey contract for a 1,3 km jetty and import-export platforms for bulk carriers.

• Steel piles : 26,000 tonnes
• Steel structure : 16,000 tonnes
• Concrete : 24,000 m³
• Steel reinforcement : 5,000 tonnes
• Quick release hooks : 47

Design and build turnkey contract for a jetty and docking platform designed for the export of coal on the basis of 8,000 tonnes/hour. Project delivered in record time with the use of our Cantitravel tool enabling gradual construction from the coast, and thus avoiding the use of marine equipment with the downtime involved.

Scope of works

• Landing from the beach
• Approach jetty 1,750 m long x 10 m wide
• Loading platform 347.50 m long x 22 m wide
• 160 m service vessel platform at the end of the jetty

 Main quantities

• Steel piles : 10,500 tonnes
• Structural steel : 11,200 tonnes
• Concrete : 9,500 m³

Eiffage Génie Civil is taking part in the Al-Zour Refinery mega-project for Kuwait Petroleum Corporation’s subsidiary KIPIC (Kuwait Integrated Petroleum Industries Company). This project includes three major structures :

 - A 1,700 metre jetty for loading ships with sulphur granules produced in the refinery. The jetty will be extended by a wharf and is to carry a 3.6 km conveyor belt linking the refinery with the ship loading towers.

 - Sea Island, an offshore platform for loading ships with refined products, located 17 km from the coast and linked to the refinery by an underwater pipeline network. The north and south wharfs linked to the central platform will enable up to 4 ships to be loaded at the same time.

 - A service port reclaimed from the sea, comprising a covered area, a berthing facility for support craft, a fuel depot and other infrastructure needed for site operations.

Design and build turnkey contract for Gorgon LNG liquefaction plant maritime infrastructure. 

• Concrete caissons : 56 units (2 rectangular units, 28 x 23 x 6 m ; 40 circular units, 26 m in diameter x 6 m high ; 14 circular units, 20.5 m in diameter x 5 m high)
• Steel modules : 120 units
• Concrete : 60,000 m³
• Steel structure : 34,000 tonnes
• Process piping : 5,100 tonnes
• Solid ballast 150,000 tonnes
• Caisson filling ballast : 24,000 m³

For this LNG export facility, Eiffage Génie Civil Marine developed a revolutionary construction approach with our local partner which minimises the use of maritime equipment in the Pacific Ocean’s particularly rough swell conditions and enables safe, efficient and successful facility building.

Design and build turnkey contract for Melchorita natural gas liquefaction terminal’s maritime infrastructure, providing berthing for LNG tankers with a capacity of up to 165,000 m³.

• Steel (piles and jetty structures) : 23,725 tonnes (including 6,000 tonnes of prefabricated structures)
• Quarry materials : 2.3 million tonnes
• Prefabricated concrete slabs : 5,200 m³
• Concrete for protective shell in cold runner system : 66,700 m³ for 12,650 units