Blauer Turm, Bad Wimpfen

The Blue Tower is the landmark of the spa town of Bad Wimpfen, a medieval Staufer palace located on the Neckar River. 
The renovation work began in November 2017 and was originally scheduled for completion in the summer of 2021.
In the process, the tower was to be stabilised again by means of Anchor rods and mortar injections into the masonry.
The latter were used to close cavities in the masonry.
However, it turned out that the drilling and injections were more time-consuming than expected.
In addition, the cavities were not reached in some areas, as trial drillings showed.

Modersohn then developed special Welded constructions. 
These are complex tie rod heads that were welded together from seven different components.

A mandatory requirement for the realisation of this project was the proof that the pre-material for each individual component has a tensile strength of at least  690 N/mm².
MODERSOHN obtained the necessary factory certificates and was able to start with the implementation.

The material used for the tie rod heads was the corrosion-resistant duplex steel 1.4462.
It is characterised by its high strength and yield strength, which was a prerequisite for its use in this project.