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In Norway a large number of timber bridges have been built for the last 15 years. This has given us an opportunity to compare the cost of timber bridges with bridges in other materials. Cost wise timber bridges in Norway are competitive to concrete and steel bridges, provided the right circumstances. Arch bridges and slab bridges are the most common timber bridge type in Norway. It is not a coincidence that these types are the most common timber bridges. Used in the right way, these kinds of bridges can be cheaper than concrete or steel bridges. Factors that reduce the costs are low self-weight that gives small foundation, prefabrication gives short construction time and low construction height gives small embankments. Other examples from Norway shows that it is possible to re-use old foundation and change the superstructure from steel or concrete with a new superstructure in timber that gives a wider road. To secure long life-cycle for the timber bridges, there has been focused on designing details to minimize maintenance cost. To protect the timber against water the timber has been given creosote impregnation and copper cladding.

Referanser

Bridge cost bank 1996-2009, Public Road Administration.





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