As railway station of the provincial capital of Lower Austria, the St. Pölten main station is of great impor-
tance.
Since this traffic junction already reached its capacity limits before the start of the planning, the remodelling
is essential for the development of the municipal location.
The works comprise the renewal and extension of the railway sidings to eight through tracks. Further-
more, the
section west of the station will be straigh-
tened and developed into three main tracks.
In the course of a complete remodelling of the railway building, the Kremser road, which passed under the historic
main entrance, had to be repositioned. Additio-
nally, a new pedestrian underpass and a road bridge are included in
the project.
All works have to be execu-
ted at full railway service.
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For this project, BGG Consult carried out the consulting in the fields of geotechnics and hydrogeology during all
planning and construction phases. After the commercial and technical supervision of subsoil exploration works, a
geotechnical-hydrogeological expert's report for the permission procedure was compiled.
In the tendering phase, geo-
technical expert's reports have been worked out for each of the contract sections.
Additionally, the checking of the detailed project from a geotechnical viewpoint and the dimensioning of retaining
structures and building pit walls is included in the scope of work. During construction, the works are supervised
on site with regard to geotech-
nics and hydrogeology. Furthermore, retaining structures (bored pile walls) and
slopes are monitored using geodetic measuring points and eight inclinome-
ters.
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Retaining Structures Western Section:
In the section west of the station, the railway line crosses a geological fault zone, the so-called St. Pölten Fault.
For this reason, particular attention had to be paid to the design and the dimensioning of the cut extensions,
especially because of the high ground water level.
Therefore, the retaining structures were designed in form of intermittent bored pile walls with shotcrete noggings
on both sides of the line.
Instabilities that occurred locally were secured by means of slope flattening, riprap or anchors. In this way, a
cost-effective construction at a sufficient safety level could be secured.
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