Monitoring cracks in the foundation slab of a Warsaw skyscraper

Nowadays, spectacular skyscrapers are built in the centres of large cities. This project refers to a structure located in the centre of Warsaw. Due to the proximity of the surrounding infrastructure, it is very important to monitor the interaction of the foundations with the ground during the entire construction (building the subsequent floors). That is why EpsilonRebars were chosen to control strains and cracks both in deep barrette piles as well as the foundation slab.

DFOS Sensors Installed: EpsilonRebar

Project challenges

How to apply non-invasive diagnostics in demanding historic structures?
How to get precise measurement data to detect local damage and imperfection?
How to measure detailed strain profiles over the entire height of the brick masonry wall?

Benefits of using the DFOS monitoring system

Strain measurements both in barette piles as well as the foundation slab
Detection of all the cracks and localised events inside the concrete
Full knowledge on foundation deformation state during all construction stages
Information on events invisible to the naked eye and unreachable by other techniques

Results of using the DFOS monitoring system

EpsilonRebars were used to measure strains and detect cracks during selected construction stages. Seven sensors were installed in both the lower and upper part of the foundation slab, while ten sensors were placed along the barrette piles to a depth of 22 m. Obtained results allowed for analysis of force transfer along deep piles as well as to detect all cracks in concrete foundation slab.

Technical specifications

37 600 measurement points
376 m of sensing path
17 x EpsilonRebar
during construction

Example results

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John Doe

Project partner

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