The Lys River is being widened as part of the Seine-Schelde project to improve inland navigation in Flanders, without losing sight of nature and recreation. The client De Vlaamse Waterweg NV is working with the municipality of Wielsbeke and the City of Waregem to create a new bridge for cyclists and pedestrians. After completion, everyone will be able to enjoy the Lys and tourist attractions on both banks in a pleasant and safe manner. SBE is responsible for the integral design of the bridge, including approach ramps, environmental layout and the bank protection to be added.
An optimal tourist-recreational connection is formed across the Lys by opting for a connection between Wielsbeke on the left bank and Waregem on the right bank. Considering the landmarks in the vicinity, an S-shaped layout has been selected, which consists of a steel bridge and concrete access ramps.
The main consideration behind the bridge design, in addition to the usual technical requirements, is spatial integration within the green character of the landscape. The bridge should “disappear” into the landscape, where the view is not obstructed by protruding, visually dominating support elements. The design is not intrusive, but rather forms a harmonious whole through a sober structure with both promenades along the Lys on the banks. Existing vegetation will also be preserved to the maximum extent possible and restored where possible.
The various disciplines within SBE allow rapid and efficient switching between structural requirements and architectural design. The moment line created by its own weight is used to optimize the shape of the bridge. This typical moment line is inverted and used as a form for the supporting structure, which results in a dynamic and clean design, while also minimizing the use of material.
A parametric geometry model is built in the design phase due to the organic shape. Different variants can be tested by exporting this model into a calculation and drafting model. The most interesting design is ultimately selected by considering form, cost estimate, use of materials and technical requirements.
Given the redevelopment of the Seine-Scheldt connection, the CEMT class of the Lys should be widened to 58.45 m in the future. Installing bank protection, including exposed concrete cross-beams, at this stage already at the bridge and approach ramps means that only dredging work needs to be done at a later stage.
SBE is responsible for the integral design of the new bridge and its surroundings.
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