Effective Load Control on the Bridge

Another area where sensors provide intelligent monitoring when measuring load is when pressure sensors are used to measure and record the load distribution on bridges.

The intensity of traffic flows on our roads is difficult to measure, and the increase in the share of trucks in areas of load impact on bridges is even more so. Moreover, the soil is not static, and the movement of tectonic plates on the planet causes daily mobility beneath our feet. These two variables constantly change the load distribution on the bridge. To continuously ensure safety, it is necessary to constantly monitor changes in load distribution using sensors.

Previously, bridge loads were visually monitored using mechanical indicators in the bridge joint bearings. Keller focused its attention on this main load-bearing element of the bridge and integrated a network solution for measuring pressure in the bearing. The bridge transfers loads to an elastomer pad.

Between the pressure sensor and the elastomer is a layer of lubricant that transmits pressure to the sensor, allowing measurement of the internal pressure corresponding to the load.
These load changes are detected by the pressure transmitter, whose special design, agreed with the Customer, integrates perfectly into the bridge support bearing.

The GSM module reads data immediately via a digital interface and sends warning messages to responsible recipients depending on the measured parameters.
The use of stable Keller sensors and stainless steel as the material for manufacturing pressure sensors guarantees a long service life, decades of reliable measurements, and functional safety. According to the latest developments, Keller sensors can be equipped with LoRa modems for remote transmission of pressure and temperature data. Using the Internet of Things, bridges can be reliably and continuously monitored for changes in load distribution, preventing threats by limiting traffic flow up to complete closure of movement if necessary.