Case Histories

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  Tesalia Tunnel

  Caldas, departamento, Colombia

  The Tesalia Tunnel project, located in Colombia, has a length of 3.5 km and facilitates connectivity to the country’s main production centers.

  The slope stability of the tunnel entrance portals are monitored using Model 1100 Rod Type Borehole Extensometers, with Groutable Anchors, and Model 4450 Displacement Transducers. Instrumentation was installed in 2018 for monitoring the tunnel during construction and operation phases.

  For additional information, please contact: Francisco Ordoñez | Ingenieria Tecnologia e instrumentacion S.A.

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  Blackfriars Station Redevelopment Project

  London, England, United Kingdom

  An extensive instrumentation system has been installed at the Blackfriars Station in London to monitor the station, rail tracks and surrounding buildings as the underground part of the old station is demolished and a new station constructed.

  Instrumentation included Automated Total Stations, Accelerometers, Crackmeters, Tilt Beams and Strain Gauges.

  For additional information, please contact:  | Strainstall UK Ltd.

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  Chaira Pumped Storage Power Plant (CPSPP)-II

  Southwest Bulgaria

  The hydroelectric complex of the Chaira Pumped Storage Hydroelectric Power Station is situated in the northern part of the Rila Mountains in southwest Bulgaria. It consists of the Belmeken and Chaira Dams and the Headrace and Penstock Tunnels between them.

  During the summer of 1997, instrumentation was installed to monitor the behavior of the Headrace and Penstock Tunnels during filling and operation. The instrumentation around the Headrace Tunnel No. 2 consisted of vibrating wire Piezometers installed both in the concrete lining and in the surrounding rock.

  The instrumentation in the Penstock Tunnels consisted of vibrating wire Strain Gauges to measure stress in the concrete and Embedment Jointmeters to measure any detachment of the concrete from the steel liner. Readings were taken and recorded using the GK-403 Vibrating Wire Readout Box.

  For additional information, please contact: Petko Slavov

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  Busan Subway 308

  Busan, Korea

  A comprehensive instrumentation system comprising Tiltmeters, Inclinometers, Extensometers, Tape Extensometers, Strain Gauges and Load Cells was installed to monitor the safety and stability of subway (section 308) in Busan, Korea.

  For additional information, please contact:

  Young Eok, Kwon | Heung-In E & I Co., Ltd.

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  FCC (Line 7)

  Madrid, Spain

  The construction of the FCC (Line 7) subway in Madrid used a combination of both cut and cover and TBM excavation methods.

  The retaining walls, supporting the cut and cover excavation, were instrumented with Strain Gauges, Inclinometers, Pressure Cells and Piezometers.

  Tunnel sections were instrumented with Concrete Stress Cells.

  For additional information, please contact: Javier Andreu | Ingeneria de Instrumentacion Y Control