Flexural strengthening of a reinforced concrete slab in a school building in Winterthur
Winterthur ZH, Switzerland
In the framework of several renovation works in the school building ‚Hohfurri‘ in Winterthur re-bars were installed as a strengthening method in negative bending zones. Initiallly, grooves were cut into the slab. Afterwards, re-bars were installed and end-anchored over a length of at least 40 cm at each bar end. After sufficient cure of the self-levelling mortar, the bars were heated and hence activated over their free length. Finally, the remaining groove space was filled with self-levelling mortar.
Over 100 re-bars with a length of 4 m were installed in a groove, end-anchored at both sides and finally prestressed.
Oberli Ingenieurbüro AG