Objective

• Monitoring of crack widths or crack movements and local climate on up to 500 m long motorway bridges in Germany
• Increasing sustainability by extending the service life of the motorway bridge

‍

Customer

Kempen Krause Ingenieure GmbH

‍

Period

In operation since 2019

‍

Challenges

• Poor accessibility of crack locations
• Years of battery life
• Weather conditions
• Long radio ranges necessary due to large distances between measurement locations

‍

Realization

• nemi WAMS (Wide Area Monitoring System) based on a local wireless network with up to 30 battery-powered sensor modules nemi WAMS Node and a battery-powered gateway nemi WAMS Bridge.
• Detection of temperature, humidity and crack width in each nemi WAMS Node
• Long battery life of 7 years (at one reading per 20 minutes) due to ultra high efficiency radio technology in the 868 MHz frequency band nemi Link 868
• IP 67 weatherproof housing and position sensors
• Data transmission via MQTT connection over cellular network to nemione server
• Possibility of alarming by e-mail and SMS when limit values are exceeded

‍

Advantages

• Simple installation due to omission of cabling on large structures
• Self-sufficient solution without additional mains power supply
• Automatic customized report generation and display of live measurement data in online dashboard
• Safe use of bridges can be extended for many years in the event of exceeding static loadings

‍

Deployed nemione^® products

• up to 30x nemi WAMS Node
• 1x nemi WAMS Bridge