Belgium – Construction structures and materials; auxiliary products to construction (except electric apparatus) – CONCEPTION ET FABRICATION DE DEUX BATARDEAUX METALLIQUES POUR LES ECLUSES DE KAIN ET D’HERINNES (HAUT-ESCAUT)

The present contract concerns the design and supply of two cofferdams with a span of 14 metres intended to allow the dewatering of the Haut-Escaut locks, belonging to the Walloon Region (sites of Kain and Hérinnes). The existing structures, built in the 1920s, are sized to accommodate a maximum class Va inland waterway traffic. The two locks have a similar design, so the cofferdams must be compatible with both structures. For information, their design is also similar to that of the locks at Berchem, Audenarde and Asper in Flanders. The design water levels to be considered for the sizing of the metal structures are also comparable between the different sites. A cofferdam may consist of several distinct elements, assembled together by means of watertight joints. The total height of a cofferdam is set at 6 metres. The cofferdams must be sized in accordance with the applicable regulations, and in particular the Eurocodes. Particular attention will be paid to the number of joints in the cofferdam, which are as many weak points for watertightness, as well as to the unit weight of the components, the sites being difficult to access for high-capacity lifting equipment. The contract includes, in particular: The verification of all the dimensions in situ necessary for the production of the workshop drawings; The supply of a complete execution calculation note including a note concerning handling; The manufacture of the cofferdams in the workshop; The transport of the cofferdams to their storage site (located in Kain, Hérinnes or other SPW VH Tournai site to be defined). The supply of a good practice note relating to the life of the structure, including in particular the prescriptions concerning storage, the replacement of joints, anti-corrosion painting as well as the safety instructions during handling operations and the "As-built" file. The overall contract execution period is set at 240 calendar days and starts on the date set by the work order, in accordance with Article 116 of the present C.S.C.