Plates-formes de déchargement de vrac liquide à Duqm

Conversion d'un port isolé en une plaque tournante internationale pour le carburant

Six Construct était le sous-traitant principal de génie civil pour la construction de deux jetées à double poste d’amarrage et d’un mur de quai de 1 km dans le port isolé de Duqm, à Oman. Le projet a été construit en consortium avec Royal Boskalis Westminster et a permis au port de Duqm d’accueillir et de gérer des navires porte-conteneurs géants.

A close collaboration

The roles in the Engineering, Procurement & Construction (EPC) contract were nicely divided. While RBW carried out the rock cladding, dredging and raising works, Six Construct was responsible for the detailed design of the maritime structures. It equally took care of building a 1 km long quay wall and two twin-berth jetties with associated facilities and navigation equipment.

Smooth communication and efficiently coordinating activities ensured the project was delivered in record time.

Preparing down to the last detail

One of the biggest challenges was the remote location. The site was situated 500 km from the closest urban area, the Omani capital of Muscat. This impacts every aspect of the project, not in the least the procurement of materials and equipment.

The Six Construct-RBW consortium tackled this with an extremely detailed and perfectly coordinated planning, right from the start. The entire project was first executed on paper and computer before being actually built. This allowed the team to leave virtually nothing to chance and this contributed largely to the project's overall success.

L'équipe d'ingénierie de BESIX a proposé une solution pour construire 'à sec'. Cela a fait une réelle différence : l'équipe a pu réduire la durée de construction tout en renforçant la qualité des constructions permanentes. Comme tout était visible à l’oeuil nu, le travail de précision revêtait d’une importance cruciale. Tout cela au profit de notre client.

Building 'in the dry'

Maritime facilities like these are usually built from a platform in the water. In the case of Duqm, the BESIX engineering team proposed a different method: building 'in the dry'.

This involved sealing off the construction site from the sea by building a sand dam – a retaining wall of reclaimed sand – and by pumping the site dry. Some 26 million m³ of material was dredged from the seabed by RBW. This allowed the team to work on a platform 20 m below sea level, which would later form the permanent seabed. Six Construct built the quay and berths using specially designed temporary structures.

After the works, the port was re-flooded again, with sea levels rising up to two metres a day over the course of two weeks