Sirdal municipalityBridges01.2025 – 09.2025
Tonstad pedestrian and cycle bridge
A new four-span pedestrian and cycle bridge across the Sira at Tonstad, with pier foundations cast in sheet-pile cofferdams in the river.
−01The assignment
Sirdal municipality is building a new pedestrian and cycle bridge across the Sira at Tonstad. It is a four-span composite bridge with a total length of approx. 107 m and a longest span of approx. 30 m.
−02Geoteknia’s role
Geotechnical design of the bridge foundations for Degree of Freedom AS.
−03Technical challenges
The bridge rests on concrete footings on in-situ sand and gravel. River piers are cast in sheet-pile cofferdams with top of footing approx. 0.3 m below the final riverbed. Abutments are excavated with open slopes.
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