RBO Instone Süd is a 38,000 m² residential quarter in Hamburg-Rotherburgsort, built in solid construction across 11 separate building entrances on a shared underground car park. Buildings reach up to eight upper storeys. The foundation is a skewed (non-orthogonal) beam grid on bored piles — a deep foundation system where the pile layout and beam grid do not follow a simple rectilinear pattern, adding geometric complexity to load transfer at every pile cap and beam intersection.

CN Europlan delivered LP5 construction documentation for the project. At 38,000 m² with 11 building entrances on a single shared basement, the engineering challenge compounds two factors: a skewed beam-on-pile foundation that resists standardised detailing, and a height regime varying up to eight storeys across the complex, meaning load paths into the foundation differ significantly building to building even though they share one substructure.

Key Takeaways

• Skewed beam grid on bored piles: A non-orthogonal pile and beam layout means standard rectilinear foundation details don't apply directly — each beam-pile intersection geometry has to be resolved individually within the documentation.
• Eleven entrances, variable building heights, one basement: Up to eight storeys in some buildings and fewer in others means the shared foundation absorbs uneven loads — the LP5 has to track this variation across the full shared substructure, not assume uniform loading.
• Large-scale shared underground car park: A single basement under 11 building entrances requires waterproofing and structural continuity to be managed as one system across the full 38,000 m².