Tag: Engineering

Race Bank

Jan De Nul pulled out all the stops for the cable installation project at the Race Bank Wind Farm. The job description read as follows: realising a cable connection between the wind farm and the mainland on the English East Coast. A distance of 71 km…

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Envisan Centres

In common with other parts of Jan De Nul Group, the Environment Division Envisan also goes for an integrated approach, from design to execution. Sediments and soils coming from dredging and earthworks are transported to own treatment centres for treatment…

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A11

Back in 2011, Jan De Nul, as frontrunner of the project company that realised the A11, did everything in its power to win the contract for this project. The innovative character of the engineering structures, the aestheticism and fully-fledged integration…

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Kriegers Flak

During 2021, the 600MW Kriegers Flak offshore wind farm, in the Danish waters of the Baltic Sea, will commence the supply of electricity to 600,000 families. Grid Operators, Danish Energinet and German 50 Hertz, will connect the  Kriegers Flak OWF…

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Circular solutions

Our answer to environmental issues: Envisan. We cannot escape it. The climate, the environment, recycling, clean-ups and the circular economy are hot topics. Now, let these hot topics be the core business of Envisan, Jan De Nul Group's Environment…

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A curtain of piles

The word ‘wall’ may in fact be misleading. The quay is built on five rows of piles over the 800 metre length on which a 35 metre wide concrete platform is built, consisting of large concrete prefabricated elements placed as tiles onto the…

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The DN120 lays cables in shallow water. The Sunfish and Moonfish burry them at the pre-set depth.

The Sunfish and the Moonfish were indispensable for the Race Bank project. But, obviously, they were not alone. “Export cables may look very solid, but applying too much force while pulling them is absolutely advised against. To be able to pull…

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Homemade machines

Dries Lammens was among Jan De Nul’s engineers who were present when the requirements set to the Sunfish and Moonfish were put on the table. “A project for which so far no equipment existed but for which it must be created is no doubt a challenge,”…

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Isaac Newton: with 63 km of cable in one go the world's largest cable-laying vessel

“We are a work in progress, getting better by the day,” says Rutger Standaert. On his business card, he carries the title of ‘Technical Superintendent New Building Design’ or, in short, one of the naval architects at Jan De Nul.…

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Divisions work together to win projects

"In fact, we are able to win such projects at the time everything is still on the drawing board,” explains Patrik Lowie. “The trick is to simulate and visualise all possible situations beforehand. Looking at this from a distance, one…

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Flexibility is the operative word in the drawing office

The ship building department drawing office is an indispensable part of Jan De Nul’s engineering services. One of its main activities is designing equipment for our vessels. As among Jan De Nul’s shipbuilders, flexibility is the operative…

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Testing 10 biological oils

In connection with the Race Bank project, Alain Pieters from the R&D department was asked whether the seals of the trencher Moonfish would not be affected by the use of biodegradable oil. “The client wanted to avoid that, in the event of a…

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30 years of maintenance

The maintenance contract is crucial in this project. You can compare it with the relationship between tenant and landlord. Jan De Nul must maintain everything and carry out all necessary repairs to keep the building in a good state for thirty years.…

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Rock expert from the Ardennes

Takoradi is situated in the Gulf of Guinea. Ordinarily waves are 1.5 metres high, but in stormy weather they are another metre higher. To allow safe and continuous working, we first had to restrain the forces of nature. Pascal Dumez, project manager…

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Level foundation under water

The subsoil determines the construction method of a quay wall. In Ghana, it is rocky, which makes it difficult to work with drilled piles. Here, prefabricated concrete blocks offer the best solution. The rock below water acted as foundation after the…

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Prefabricated concrete block in lego style

The total quay wall height is up to 20.7 metres, with at low tide 3.2 metre above and 17.5 metre below water. It is built of 4,000 concrete blocks each of 50 tonnes, all made on site. When stacking the concrete blocks, these are aligned alternately.…

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The workshop, a hive of activity

José Pycke already works twenty years for Jan De Nul and is responsible for the workshop in Aalst. The workshop has 70 employees, spread over several departments, almost half are welders but we also have plenty of machine operators, electricians…

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CSR

Corporate Social Responsibility.   In 2017, our first CSR report was published. It listed the numerous sustainable initiatives that are currently in process within Jan De Nul Group. Following this, we have now engaged our first CSR manager to develop…

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Concrete from our own concrete batching plant

For this project, Jan De Nul built its own concrete batching plant on the spot. We had to do this to be able to meet the strict quality requirements of the contract that could be impacted when using local ready-mix concrete suppliers, due to traffic…

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Centre in the South of France

For CPEM, near Toulon, in full Centre de Production d’Eco-Matériaux, 2016 was the first complete business year. Lilian Rahyr, head of this treatment centre, sketches an overall picture: “In the past year, we’ve treated about…

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The Tiger, the real project hero

Jan De Nul’s added value for projects such as this is its extreme flexibility in searching for customised solutions. For instance, we completely converted the Tiger, a self-sailing split hopper barge, so as to be able to remove sediments in places…

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Vessels conversions

Mimar Sinan and the Tiger For this first stage, several vessels have been converted. Tom: “One of the reasons for this is that we are working on a very small surface area. For instance, on the backhoe dredger Mimar Sinan we installed a special…

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Bridges, tunnels and viaducts

Seen from the air, the whole trajectory of the A11 – from the industrial estate ‘Blauwe Toren’ near Bruges to Westkapelle –looks particularly impressive. Bridges, entry roads and exits and roundabouts form joint interchanges at…

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Innovative foundations

“The foundations of some of the engineering structures placed major challenges before us. ”, says Eric Leemans from Soetaert, the foundation expert that in the course of the construction period became part of Jan De Nul Group. The foundation…

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The integral technique makes a complete comeback

Koen Van Regenmortel is particularly proud of the maintenance-friendly application of the integral bridge technology in different places on the track. “Joints are subject to wear, no matter which road surface you use, and require intensive maintenance.…

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Labour intensive job

The construction hasn’t been entirely without challenges. Koen Van Regenmortel, Civil Works Project Manager, supervised the construction works. “We did everything in our power, and more, to speed up the construction and complete the installation…

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