Groundwater monitoring for the Fornebu Metro Line in Oslo, Norway++

COUNTRY:
Norway

PROJECT TYPE:
Remote Wireless Tunnel Monitoring of ground water and pore pressure

SECTOR:
Tunnels

MAIN PRODUCT:
Loadsensing

Challenge

The Fornebu Line project, the largest transport project in Oslo in more than 20 years , was finally approved in January 2018 after various proposals and years of planning. The new metro line which is part of Norway’s latest National Transport Plan, will run westward from Oslo’s transport hub at Majorstuen to Fornebu – the site of Oslo’s old airport that has since been redeveloped with large office complexes, housing projects and open space.

The project owner, Oslo Kommune Fornebubanen, needed to do monitoring before, during and after the construction period which can span more than 10 years. To prepare for the geotechnical monitoring for the construction that will start approximately by the end of 2019, the project required a wireless data acquisition system to gather data from sensors that were to be installed in and around the tunnel that will span approximately 8,3 kilometers. To capture and transmit accurate data over this wide territory, the data nodes need to be compatible with different types of sensors and have to ensure minimal manual maintenance when replacing batteries to keep operating costs down and be eco-friendly.

Solution

Even before the start of the construction phase, approximately 200 Loadsensing Vibrating Wire 1-channel polycarbonate and aluminum wireless data nodes are already successfully collecting and transmitting data from different types of sensors, such as push-in piezometers from Geonor for pore pressure measurements, and embedment piezometers from other vendors for ground water level measurements.
As opposed to common networks such as GSM based communication, Loadsensing uses LoRaWAN connectivity: a long-range, low-power wireless technology used by IoT networks worldwide. The system’s low-power components remain on sleep mode and are only activated at predetermined times, allowing a battery lifespan of up to 8 years.

Benefits

By using Loadsensing nodes operated wirelessly through LoRa instead of GSM, Oslo Kommune Fornebubanen benefits from near-real time data transmissions, and they also save on costs of manual maintenance due to the low-power data nodes, which are expected to last until 2029, 3 years beyond the scheduled project completion in 2026.

The metro transit system will also be able to eventually support the additional morning rush-hour commuters expected on this route, based on plans to locate 20,000 new jobs and up to 11.000 new homes in Fornebu.

About Worldsensing
Worldsensing is a widely recognized global IoT pioneer. Founded in 2008, the Barcelona-based technology provider delivers Operational Intelligence to traditional industries and cities. With over 90 employees and offices in Barcelona, London and Los Angeles, Worldsensing is globally active and has customers in over 50 countries on 6 continents.

About Geonor
GEONOR AS, founded in 1957, has been a pioneer in the development of geotechnical field equipment, geotechnical laboratory equipment, and in particular geotechnical and meteorological instrumentation based on vibrating-wire technology. Key partners in this development have been the Norwegian Geotechnical Institute, the Public Roads Administration and the Norwegian Meteorological Institute. Geonor has proven solutions which are constantly developed by combining new sensors, wireless communications and Internet-based solutions
.

Loadsensing data nodes have been deployed at the Fornebu Metro Line project to perform remote wireless monitoring of groundwater and pore pressure measurements before, during, and after completion of the metro extension. These underground hydrological conditions at the site are being monitored to ensure that they remain stable throughout the project, and on into the operational phase.

Advantages

  • Cost effective, real-time, remote wireless monitoring of commonly used ground water level & pore pressure sensors
  • Minimal maintenance required for the long-range, low-power, wireless Loadsensing data nodes
  • Environmentally friendly solution using smaller batteries with longer lifetime compared to traditional systems based on GSM communication

As a system integrator of many years, we are very pleased with the Loadsensing system. Data loggers are available for most types of sensors and both mounting and configuration are easy and fast. One has full control over the gateways via the Loadsensing data server and data transfer also works great. In addition, Wordsensing offers very good and professional technical support.

Øyvind Klevar, General Manager - Geonor

Groundwater monitoring for the Fornebu Metro Line in Oslo, Norway

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