New Constrcution GLC, ETH Zurich

Geodetic and geotechnical permanent monitoring of a deep excavation pit

Project: 2016 - 2019, Zürich, Switzerland
Client: Swiss Federal Institute of Technology (ETH) & Steiner AG

The excavation pit for the new ETH research building in Zurich is a technical challenge and contains all the difficulties of special civil engineering, such as pre-stressed diaphragm walls, bored piles with multiple back-anchoring, underpinning with micro piles and jetting, etc.

A construction pit of this depth in a steep slope in the city centre is highly dangerous and its behaviour must be monitored intensively using measurement technology.


  • Permanent 3D monitoring of the excavation walls and surrounding buildings
  • Installation and operation of geodetic and geotechnical monitoring systems
  • Data transmission to the data loggers, partly wired and partly via radio
  • Alarm when limit values are exceeded
  • Project in collaboration with AFRY Schweiz AG, which carried out crack recordings on the surrounding buildings and manual deformation measurements on buildings and tram rails.


  • 2 precision total stations with 100 monitoring points
  • 9 chain inclinometers, each with 15 sensors (135 sensors in total)
  • 6 5-fold extensometers (30 sensors)
  • 70 anchor force sensors
  • TEDAMOS Web, password-protected customer portal with 24/7 access

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