Oldenburg
Abraham Quartier
Oldenburg, Germany / 12.2021 - 04.2022
For the Abraham quarter, a mixed-use residential and commercial building was constructed on a plot of approximately 2,700 m² in Oldenburg’s pedestrian zone, featuring retail and catering spaces on the ground floor as well as 121 micro-flats. PORR building construction region Nord was responsible for the turnkey construction of the building. PORR special civil engineering GmbH carried out the deep foundation works, whilst the detailed design was prepared by PORR special civil engineering Planung.
Facts & Figures
Company
PORR Spezialtiefbau GmbH
Type
Foundations
Runtime
12.2021 - 04.2022
Deep foundations for a residential and commercial building in Oldenburg city centre
Full displacement drilled piles for the foundations of the new building
Following the dismantling of the existing buildings, the former basement areas were backfilled with construction rubble. PORR special civil engineering constructed a total of 157 full displacement drilled piles for the deep foundations of the new building. In the area of the former cellars, the piles were guided through the remaining cellar structures via well rings and core boreholes to ensure the planned load transfer to the subsoil.
Special civil engineering on a confined site in the pedestrian zone
The inner-city location placed particular demands on site logistics. The delivery of drilling equipment, reinforcement cages and concrete took place in confined spaces within the pedestrian zone. In addition, individual piles were constructed in the immediate vicinity of existing buildings. This required precise coordination of the construction processes as well as execution tailored to the local conditions. The full displacement drilled piles method was used for the deep foundations. With this method, the soil is displaced during construction rather than excavated. Consequently, no excavated soil is produced during the pile construction process. At the same time, the method allows for low-vibration construction, which can be particularly important for inner-city construction projects.
Deep foundations using full displacement drilled piles
The choice of full displacement drilled piles was made taking into account the local site conditions and the foundation requirements for the new building. Unlike drilling methods involving soil extraction, the existing material is displaced during construction. This eliminates the need for transport and disposal of the soil generated during the pile construction process. Furthermore, depending on the structural requirements, full displacement drilled piles can be constructed with smaller pile diameters than other foundation systems.
The foundations for the Abraham Quarter
The deep foundations formed the basis for the construction of the mixed-use residential and commercial building in the Abraham quarter, situated in the heart of Oldenburg city centre.
