In order to address the project requirements, ANGERMEIER INGENIEURE GmbH installed around 100 geotechnical sensors and 400 geodetic monitoring points. Among the sensors installed are multi-point extensometers located at several measuring points along the tunnel route that is built under public areas and roadways. To automate data acquisition without installing long and expensive cables, the extensometers are connected to Loadsensing vibrating wire 5-channel data nodes. A wireless biaxial tiltmeter, which serves as a sensor and node in one, is also installed to monitor the tilt of the surrounding structures.
The battery-powered nodes, installed in a covered manhole to prevent vandalism, successfully send data wirelessly to a gateway, installed on top of a temporary office building on site, which in turn immediately transmits the data to an evaluation and visualization system.
For connectivity, Loadsensing uses LoRa: a long-range, low-power wireless technology used by IoT networks worldwide. Features of the system include:
Radio: Loadsensing has radio signals up to 32 times stronger than other wireless monitoring systems which can penetrate through metallic manholes.
Range: The monitoring system uses a star network topology that can cover a range of up to 2.5 miles / 4 km in a tunnel without any repeaters.
Batteries: The nodes are extremely low-power and can last for up 10 years or until the project completion around the year 2025.
Using Loadsensing, which allows collecting monitoring data wirelessly, eliminates the need for expensive cabling that could disrupt traffic and construction work. While setting up the system is simple, data can be acquired even from sensors inside manholes. Ultimately, the monitoring system helps to ensure that the environment is safe not only for workers on site but also for people who live and work in the city center.
For a metro line extension project in Frankfurt Loadsensing data nodes and gateways were selected to perform geodetic and geotechnical monitoring to manage construction-related risks around the city center.
Strong radio signals that can pass through manholes and reach long distances
Less intrusive and vandalism-protected monitoring equipment and power supply in public areas
More cost-efficient and less complicated installation without the use of cables
The Loadsensing set-up and installation with the sensors were extremely simple. The measured data could be immediately transferred to the existing evaluation and visualization system. Its main advantage is its ability to send radio signals from under the manholes and over a long distance.
Dr.-Ing. Andreas Wagner, Project manager, ANGERMEIER INGENIEURE GmbH
Tunnel Construction Monitoring for the U5 Metro Line Extension in Germany
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