New underpass, Winterthur railway station

Automatic monitoring of excavation pits, railway tracks and buildings with geodetic and geotechnical sensors

Project: 2018 - 2022, Winterthur, Swistzerland
Client: STRABAG AG, Schlieren

A new pedestrian underpass with a cycle tunnel is being built at Winterthur railway station. This construction project is intended to meet the needs of Switzerland's fourth-largest railway station in terms of the increasing commuter flows and the additional demand for shopping facilities and cycle parking spaces in the immediate vicinity of the station. The construction project, which will take several years, is being carried out while the station remains fully operational.

Since the pedestrian underpass and the cycle tunnel are being built under heavily used railway lines, they will be permanently monitored using our monitoring system. In addition, other structures at risk, such as the temporary pedestrian walkway, the parking deck support and the surrounding buildings, some of which are listed, are also monitored at 20-minute intervals for 3D deformations, impermissible vibrations and high-pressure presses for any pressure fluctuations.

The test engineers, site managers and foremen are immediately alerted by text message and e-mail if the limit values are exceeded. This real-time information, which is also available in detail via a web portal, allows them to take appropriate countermeasures quickly in the event of critical incidents.


  • Installation of a complex geodetic and geotechnical measurement system
  • Operation of the system during the 4-year construction phase
  • Automatic measurements at 20-minute intervals
  • Automatic alarm when limit values are exceeded
  • Weekly manual 3D deformation measurements


  • 7 precision tachymeters with approx. 400 measuring points
  • 18 liquid levelling sensors
  • 2 vibration sensors
  • 14 high-pressure sensors
  • 16 inclination sensors
  • 40 displacement transducers (crackmeters)
  • TEDAMOS Web, password-protected customer portal with 24/7 access

More reference projects

New underpass, Winterthur railway station

STRABAG AG, Schlieren, 2018 - 2022
Winterthur, Swistzerland

Automatic monitoring of excavation pits, railway tracks and buildings with geodetic and geotechnical sensors

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Bhf Winterthur Neubau Unterführung
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Parco Verde, Schübelbach

Mächler Generalunternehmung AG, 2022 - 2023
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New Constrcution GLC, ETH Zurich

Swiss Federal Institute of Technology (ETH) & Steiner AG, 2016 - 2019
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Geodetic and geotechnical permanent monitoring of a deep excavation pit

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Renovation of the Palace Hotel, Luzern

Civil engineer: Itten + Brechbühl, Zürich, 2018 - 2020
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Automatic height monitoring with hose levelling and tachymeter

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