Sewer concrete collector refurbishment: strains, cracks and displacement measurements
The concrete sewage collector was constructed in 1964 and is now reinforced with Glass-fiber Reinforcement Plastic (GRP) panels. EpsilonRebars (ER) and the EpsilonSensor (ES) from the Nerve-Sensors family were installed inside the near-to- surface grooves to verify the strengthening process. ERs were positioned longitudinally along the entire 150-meter section, while ES was installed at selected key circumferential points. The system allowed for detailed analysis of strains, cracks, displacements and temperatures.
DFOS Sensors Installed: EpsilonRebar
Project challenges
Benefits of using the DFOS monitoring system
Results of using the DFOS monitoring system
Nerve-Sensors allowed for direct measurements of strains and temperatures, as well as detection of extremely small cracks, including their width change estimation. Moreover, thanks to the appropriate arrangement of the sensors, it was possible to calculate vertical displacements caused by the dead weight of the GRP panels and mortar injections applied during strengthening. Example crack morphology along the safety critical section as well as vertical displacement profile over entire length are presented in the figures below.
Example results
Recomendations (optional)
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John Doe
Project partner
