Castiel Viaduct

Starting situation and idea

The road section between the Calfreisen sewage treatment plant and the entry into Castiel village was to be widened due to risk posed by rockfall, snow avalanche, narrow radii and ultimately the large linear gradient.


The four-field beams with spans of 62m, 77m, 77m and 55m respectively have a width of 1/27th of the main span due to the supports arranged above the struts. The foundation was built by driving shafts into the rock and can absorb deformations to the 8m-thick gravel layer to avoid compressive forces in the bridge.


The new viaduct rises in a gradual curve at the Calfreisen plant with the bridge centre roughly 70m above ground and leads to the steep ascent towards Castiel. Due to space constraints in the connecting areas, construction activity was to be planned so that at least one lane was open to the traffic at the narrowest point.


Developer: Tiefbauamt Graubünden
Completion: 2005
Project type: New structure
Project author: Fanzun AG
Construction costs: CHF 13,5 Mil
Scope of services: Project Management in cooperation with WRS, Preisig AG, Civil Engineering

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