The mentioned project section consists mainly of a 4.7 km long, two-track railway extension,
with line straightening in certain areas. Besides excavations and dams, 25 retaining structures
(close to the existing single-track railway line) had to be built in mountainous territory. Due
to the topography of the area and the railway loads above the retaining structures, the walls
facing the valley had to be anchored.
Furthermore, three bridges had to be built in the immediate vicinity of the existing line.
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In this project, BGG Consult was responsible for the geological, geotechnical and hydrogeological
consulting during all of the planning and construction phases. To this purpose, comprehensive
subsoil exploration campaigns were planned and conducted on very difficult terrain. Based on this,
hydrogeological and geotechnical expert's reports were compiled.
The numerous retaining structures demanded an intensive evaluation, and were optimized in close
cooperation with the designer. In addition to this, the dimensions of the securing measures for
the building pits were calculated.
During construction, the securing measures and the retaining structures were monitored on the site.
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Klinzergraben Bridge:
For the Klinzergraben Bridge, unlike the shallow foundation of the existing bridge, a deep foundation
by means of bored piles (Ø 90 cm) was chosen. Consequently, only a minimal amount of additional load
was applied on the existing foundation, which kept the inclination at a minimum. As a result of this,
the depth of the building pit and the securing structures could be minimized. |