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Sealing slabs

Q8, Stuttgart-Bad Cannstatt

Stuttgart, Germany / 02.2021 - 06.2021

As part of the redevelopment of the NeckarPark district in Stuttgart, the Stuttgart branch implemented an environmentally friendly pile foundation for the Q8 building, sealed with a soft gel injection floor slab. The NeckarPark district of Stuttgart, which is being built on the site of the former Bad Cannstatt freight station, is a flagship project for sustainable urban development. The Q8 building is no exception: living roofs and green clinker facades ensure a healthy microclimate. Beneath the 22-hectare mixed residential, work and shopping quarter, complete with neighbourhood park and culture island, flow vital mineral and medicinal waters. These must be protected from environmental impacts at all times. For the redevelopment of the NeckarPark district, this meant that groundwater-friendly construction methods were mandatory.

Protecting the groundwater with the environmentally friendly Frankipfahl NG®

Within the medicinal spring conservation area,

View into the approximately 6 meter deep, flat excavation. The sheet piling walls have already been installed. In the middle of the excavation pit there are some small construction equipment as well as a construction container and silo. Two pile tools are in use at the rear of the excavation. The excavation pit is located in an industrial area, next to an office building. In the background is a hilly landscape.

Facts & Figures

Company

PORR Spezialtiefbau GmbH

Type

Sealing slabs, Foundations

Runtime

02.2021 - 06.2021

Principal
Wolff & Müller Hoch- Industriebau GmbH

PORR scores points for sustainability at NeckarPark

pile lengths were strictly limited. Above the water-bearing layers there is a protective layer of gypsum keuper. The challenge lay in transferring the loads into the ground with the shortest possible piles. Franki Piles NG® have a wider base, making it possible to use shorter piles. The 351 piles transferred the same load as other pile systems without impacting the gypsum keuper layer.

Soft gel floor slab with an optimised carbon footprint

Several sheet pile boxes located deep in the construction pit were to be protected against groundwater rising from below with a sealing slab. Instead of the jet-grouted slab that had been originally planned, the specialist civil engineering experts from Stuttgart recommended a soft gel injection slab and were commissioned to implement it. This method has an excellent carbon footprint because it requires considerably less cement, thus also saving on transport. Another advantage is that it does not produce return-flow slurry, which is costly to dispose of.

What ultimately counts in the construction business is successfully completed projects. PORR has many of these.

View into the approximately 6 meter deep, flat excavation. The sheet piling walls have already been installed. In the middle of the excavation pit there are some small construction equipment as well as a construction container and silo. Two pile tools are in use at the rear of the excavation. The excavation pit is located in an industrial area, next to an office building. In the background is a hilly landscape. View into the finished excavation pit from another side. In the background is a large, 3-4 storey office building, as well as the houses of Bad-Cannstatt. The excavation pit is covered with sand/gravel. Two employees stand in the excavation pit and talk to each other.