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Home » Case Studies » Bell Tower in Portogruaro, Italy

Bell Tower in Portogruaro, Italy

Published on May 7 2020
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Image Bell Tower in Portogruaro, Italy

The Cathedral of Saint Andrea and its Bell Tower in Portogruaro, Italy,  was built in 1839. Today it is the third leaning tower in Italy and it continues to move slowly towards the northeast.

Since 2002 the tower has been monitored with many different sensors and since January 2017 it hosts fiber optic deformation sensors. SOFO sensors are based on white light interferometry and thanks to their customizable lengths, high accuracy, low interference, and excellent long-term stability they are the right gauge for this application. The 18 SOFO sensors have been installed in three different periods: 8 in 2017, 4 in 2019, and the last 4 in 2020. Two independent but synchronized SOFO Lite reading units are measuring the 1.5m to 2m sensors continuously.

Six sensors have been installed inside the wall of bricks and are measuring the horizontal deformations at different heights, see Figure 1.

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Figure 1, horizontal installation schematic layout

The remaining 12 sensors have been installed vertically near the four corners (figure 2), with the purpose of keeping under observation the tilt and the deformation of the tower at three different heights.

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Figure 2, vertical installation of 12 SOFO deformation sensors

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Inside the Bell Tower in Portogruaro, Italy

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Fiber Optics Bell Tower in Portogruaro, Italy

Figure 3, anchoring of a vertical sensor and anchorage of horizontal sensors

Read more of our case studies on building applications from Smartec and Roctest. 

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Developer and Manufacturer of Geotechnical & Structural Instruments and Soil/Rock Testing Equipment

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Provider of innovative Fiber Optic Solutions for Structural Health Monitoring and Geotechnical Instrumentation

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Provider of Geotechnical & Structural Instruments
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Provider of Hydrogeological & Geotechnical Services. Investigations, Monitoring & Testing

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Developer and Manufacturer of Geotechnical & Structural Instruments and Soil/Rock Testing Equipment

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Provider of innovative Fiber Optic Solutions for Structural Health Monitoring and Geotechnical Instrumentation

Logo Telemac

Provider of Geotechnical & Structural Instruments
since 1947

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Provider of Hydrogeological & Geotechnical Services. Investigations, Monitoring & Testing

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