Eichstätt

Service Centre

190 Frankipiles NG® for the foundations of a new service centre

Deep foundations in varying subsoil conditions

The subsoil on the project site was characterised by widely varying depths of the underlying limestone and marl. Whilst some piles could be carried out for foundation work down to bearing rock after around four metres, the rock was not reached in other areas of the construction site. The foundation solution therefore had to be adapted to the varying subsoil conditions within the project area.

Frankipiles NG® for transferring the structure’s loads

Frankipiles NG® were used for the deep foundations. This pile system is employed in construction projects where loads are transferred to deeper, load-bearing soil layers or to load-bearing rock. The piles were manufactured in accordance with the specific ground conditions at the site. This enabled the foundation elements to be adapted to the varying geological conditions within the construction site.

Pre-compacting the gravel in areas without load-bearing rock

In areas where no load-bearing rock was encountered, subsoil improvement was first carried out by means of pre-compacting the gravel. To this end, gravel was placed and compacted to a depth of around ten metres. The pile casings were then reinstalled to the specified settlement depth, and the Franki piles with dry-mix concrete pile bases were constructed. Pre-compacting the gravel complemented the foundation design in areas with less stable subsoil.

Foundation works in the vicinity of existing infrastructure

An existing asbestos-cement pipeline ran along the construction site. Before the first piles were driven, vibration measurements were therefore carried out to monitor the impact of the works on the neighbouring pipeline. The results served as the basis for the further execution of the pile foundation in the immediate vicinity of the existing infrastructure.

Displacement piles for the foundations of the service centre

The Frankipiles NG® used are displacement piles. The method involves no extraction of the surrounding soil during pile fabrication. Consequently, no additional soil is generated as a by-product of the pile fabrication process. A total of 190 Frankipiles NG® formed the foundation for load transfer in the new service centre in Eichstätt.

Foundation for the new building

The pile foundation created the conditions necessary for the construction of the new service centre. By combining Frankipiles NG® with localised methods for pre-compacting the gravel, the foundation was adapted to the geological conditions of the site.