New intelligence for maintenance efficiency

First use of the fischer SensorBolts in the Frauenkirchen directional radio tower

New intelligence for maintenance efficiency
References
The new fischer SensorBolts were installed on a directional radio tower in Frauenkirchen for the first time. The high-strength bolts with integrated force measurement and transmission technology allow the condition of the fastening points to be monitored remotely at any time. In pilot operation, the installed fischer innovation will collect data in the coming months. The SensorBolt complements the fischer Construction Monitoring portfolio with sensor-integrated fischer products, which also include the SensorAnchor anchor rod and SensorDisc washer.

A 52 m high directional radio tower was erected as a replacement on the premises of the substation in Frauenkirchen in Burgenland, Austria, on behalf of Netz Burgenland GmbH. The steel structure supplied and assembled by Unger Stahlbau was designed as a bolted bar structure up to a height of 42 m and only welded in the top segment. The innovative fischer SensorBolts were installed for the first time on 26 June this year at selected nodes in the directional radio tower.

Property profile of Frauenkirchen directional radio tower

The customer is
Netz Burgenland GmbH
Executing company:
Company Unger Ges.m.b.H. (Oberwart)
Type of object
52 m high radio tower
Characteristic feature
First use of fischer SensorBolts, for permanent and precise monitoring and measurement of the forces acting in the bolted joints.
These high-strength bolts, equipped by Fischer with integrated force measurement and transmission technology, allow the condition of the fastening points to be monitored remotely at any time. “The special thing about this is that the mechanical properties of the screws are not changed by the sensor application,” says Dr. Daniel Rill, responsible product manager at the fischer Group. “This makes use in the high-strength prestressed area possible without restrictions.” 

With the bolted bar structure, a stable and durable structure has been created that is also intelligent. This allows the forces acting in the bolted connections to be measured precisely and continuously and monitored at any time from a distance. This is particularly advantageous in the case of difficult-to-reach attachment points. The data of all sensor-integrated fischer fastening products can be managed on the go or via a web application.
The special feature is that the mechanical properties of the screws are not changed by the sensor application. This means that use in the high-strength prestressed area is possible without restrictions.
Dr. Daniel Rill, Product Manager, fischer Group
Users can check the security of the fasteners anytime and anywhere on their PC or smartphone. As a result, the pilot project in Frauenkirchen increases the gain in knowledge of how the screws behave in practice over longer periods of time. In general, the fischer Construction Monitoring solutions are also used to increase the maintenance efficiency of structures and systems as well as to increase their safety, reduce their downtime and extend their service life.

The commissioned company Unger Ges.m.b.H. (Oberwart) identified four representative connection points on the directional radio tower in Frauenkirchen and prepared them for the use of SensorBolts. Like all screw connections, the fischer sensor innovation was particularly easy and quick to install. Georg Zaiser, Sales Manager of the fischer Landesgesellschaft in Austria, as well as the fischer Construction Monitoring experts Alexander Schmehlik and Dr. Daniel Rill accompanied the steel construction fitters during the installation and commissioning of the bolt monitoring system on site, which will collect data in pilot operation over the next few months.
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