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In 1971, the Principality of Monaco agreed to a €30 m development project on the richest part of Monte Carlo’s gold coast: the Complexe Immobilier des Spelugues. The complex was built over the Boulevard Louis II road on 15 metre concrete columns, with its hotel, convention centre and apartments overlooking the Mediterranean Sea. The Lower Corniche tunnel is amongst the most iconic lengths of track in the world of Formula 1 motor racing.
Four decades on, land scarcity led the Principality to expand into the sea once again, with the development of a new 6-hectare district, l’Anse du Portier. Construction included:

  • Removing existing rip-rap and dredging 600,000 m3 of polluted silt.

  • Backfilling and vibro-compacting 1.5 m tonnes of rock.

  • Installing 18 concrete caissons measuring 27 x 28 m and weighing 10,000 tonnes.

  • Importing 750,000 tonnes of new soil

  • Installing 1,100 piles.

In order to manage the risk of disruption or damage to the Spelugues complex, an accurate and reliable monitoring system was needed.


Regional Surveying experts, Toposud first contacted Geomesure, Senceive French distributor, for technical advice.
They wanted to continuously monitor the beams and columns without the unsightly cables and limitations of a fixed optical system.

They chose the FM3N-IX FlatMesh 3 Triaxial Tilt Sensor Node because it offered:

  • Easy installation. The wireless mesh system was quickly installed and immediately transferred data through the congested underground space without any line of sight or reference issues.

  • A robust system. Because the tunnel is partly open along the shoreline, equipment would be exposed to saltwater spray. Senceive’s IP68-rating and track-record in saline environments assured the team that corrosion would not be a problem.

  • Precise monitoring. Installed on structural elements with known geometry, the triaxial tilt sensors measured both rotational movement of the columns and differential settlement of the slab.


The small battery-powered nodes and solar powered battery were discreetly installed on the structure without requiring power/data cabling or heavy anti-theft protection and can operate for up to 15 years without re-visiting site. A Senceive cellular gateway connected to the local network enabled all stakeholders to access structural data at any time of day, regardless of their location.

The system was configured to send text or email alerts in the event of any limit breaches to more than 25 people in 9 organisations.
Benefits of the Senceive wireless solution include enhanced health and safety and significant cost savings on installation, maintenance and site access.

Sectores Senceive para monitoreo



Auscultación de superestructura o vía; peralte, alaveo y perfil longitudinal. Monitoreo de infraestructura. Convergencias, deformaciones y subsidencias en túneles y puentes



Las nuevas oportunidades del topógrafo en la auscultación y monitorización por sensores




Auscultación y monitoreo de edificios durante excavaciones, derribos, reparaciones y construcción. Convergencias entre edificios o estructuras, subsidencias

Ingenieria civil

Ingenieria civil

Auscultación y monitorización de estructuras, puentes, túneles, pantallas, muros, vuelcos, convergencias, perfiles longitudinales y verticales, cargas, tensiones, pruebas de carga




Monitoreo y auscultación de presas, oleoductos, parques eólicos, chimeneas, estabilidad, deformaciones, presión, tensión, pruebas de carga



Monitorización obra de fábrica para predicción y mantenimiento de edificios y estructuras


Medio ambiente - geotecnia

Medio ambiente - geotecnia

Excavaciones profundas, auscultación y monitoreo, movimientos del suelo y subsuelo, automatización de instrumentación geotécnica; inclinómetros, IPI, piezómetros, células de carga, extensómetros





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