CASE

An expert in temporary and static bridges, Janson Bridging proposed the use of a drawbridge as a temporary replacement for the defective Kruispoort bridge in Bruges for the first time. Because the ring canal is a busy waterway, the defective, old bridge was torn down in record time, so as to cause minimal disruption to transportation over water. The lack of a bridge, however, weighs too heavily on traffic flow and accessibility to warrant waiting for a full-fledged, permanent new drawbridge. 

DESIGN IT

Harnessing the power of the standard bridge components that Janson Bridging uses to build its temporary static bridges, a new system was developed for a drawbridge. Because this is a temporary bridge, the design parameter was not a determining factor for the final choice. 

From a technical viewpoint, more than 8 concepts were eventually developed to arrive at the final design. Initial calculations soon revealed that the original request to work with standard parts was impossible, leaving no other solution than to custom design the bridge from scratch.  

MAKE IT

The requirements and rules for the installation of a temporary bridge turn out to be no different from those that would apply to the permanent bridge. The big challenge here is that any temporary bridge must be modular. This modular approach is required for rapid assembly of the bridge in situ and quick and easy disassembly afterwards. Through optimal use of counterweights, guides, suspensions and drives, the temporary bridge can still meet all the requirements of a full-fledged bridge. 

The collaboration with various stakeholders, including 'Waterwegen en Zeekanaal' and the city of Bruges on the one hand, and the requirements, standards and commercially available components on the other, have resulted in a temporary drawbridge design that can be reused for similar situations later.  

 

 

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