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Deûle - Bankprotection from Deûlémont to Lille

Starting early 2012 until end 2014 the banks of the river Deûle have been realigned and strengthend stretching from the French-Belgian border upstreams towards Lille.

Voies Navigables de France has awarded Joint-Venture Ghent Dredging - Soetaert this contract to realign and reinforce both banks with sheetpiles, gabions and rocks over a distance of 20km.
The project is part of the widening and deepening of the river Deûle to upgrade inland shipping to CEMT-class V, enabling ships of up to 3.000 tonnes to use this waterway. The actual widening and dredging works are also carried out by Ghent Dredging.
The upgrading works of the river Deûle in the North of France to CEMT-class V is part of the Seine-Scheldt Project of with the masterpiece of the entire project will be the new canal between Cambrai and Compiègne .

To be able to carry out the works, the existing banks were cleared from trees and bushes and the existing stone-protection removed.
After vibration of the sheetpiles (in general up to 1m below waterlevel) the new banks have been built up with rocks, size 20/80 kg to approx. 1m above mean waterlevel. The remainder of the banks have been graded with (top) soil and reseeded.

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Non-exploded ammunition was found in the downstream area between Deûlémont and Quesnoy-sur-Deûle. After thoroughly side-scanning both banks the decision was made to reconfigurate one of the diggers with a safety-pack to allow for safe dredging and recuperation of non-exploded ammunition found within the sheetpile area.

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In the upstream part within the Lille-area works were to be carried out in an urban area. Problems arising from working in build-up areas such as working in confined spaces, underground cabling and the many bridges were causing obstacles to be dealt with. These circumstances necessitated the use of special techniques such as the construction of an underwater cutter soil mix wall of 500 metres.

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Some areas have been built using gabions. Existing gabions in deplorable condition have been removed and replaced with cubic gabions 1m by 1m on top of a foundation with gabion-matrasses.

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The general scope of the contract:

Sheetpiles: 81.500 m²
Rocks: 50.000 t
Gabions: 800 no.

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