Within the scope of this project, the steel lattice girder railway bridge over the Inn River in the community of Landeck, which
existed since 1883, has been replaced by a steel arch bridge. Additionally, the adjacent viaducts have been renovated and noise
control measures implemented on the bridges and on the embankments.
The new arch bridge features a total length of
64 m and a width of 7 m. The gradient of the track is 25 ‰. The weight of the new
bridge amounts to
1400 t, which is about five times the weight of the original structure.
Due to the restraint of a limited service interruption of the line, the new bridge was prepared at a distance of 10 m to the
existing bridge on temporary foundations and abutments. During a service interruption of 16 days, the new bridge was slid in the
final place after the removal of the old bridge.
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BGG Consult was commissioned for this project with the investigation of the condition of the existing structures and with the
geotechnical consulting. Within this scope, numerous vertical and horizontal exploration drillings were conducted within the
brickwork of the viaducts. Additional investigations were carried out in the areas of the foundations and the embankments.
For the construction tender, a geotechnical expert's report has been compiled based on the exploration results and the laboratory
analyses. The report covered especially statements concerning the permanent and temporary foundations as well as the sliding tracks.
During construction, our job comprised the geotechnical consulting for the client with regard to the execution of special underground
engineering works, the evaluation of alternative designs and the quality management.
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Foundation on Historic Abutments:
Due to the demand of the preservation of the historic abutments, the new, substantially heavier structure had to be placed on the
existing foundations. This posed a special challenge with regard to geotechnics, because both the subsoil under the foundations
and the condition of the brickworks had to be considered.
Furthermore, no settlements were permitted next to the existing bridge. For this reason, a deep foundation with bored piles was
chosen for the new abutments and the temporary foundations.
With this method, the historic bridge arches could be preserved without significant settlements.
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