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56 R E L A S T ® D E S I G N M A N U A L Railway overpass A70 Bamberg Problem Restoration reason The twospan prestressed concrete bridge was prestressed with the Sigma Oval prestressing steel which was used at the time and which according to the current state of knowledge is at great risk of stress corrosion cracking Therefore there was a risk of failure of the existing reinforcement and a bending and shear reinforcement had to be carried out Solution Postinstalled flexural and shear reinforcement while bridge was under operation The bridge span was reinforced from below with RELAST ® By installing the RELAST ® in sections the roadway only had to be narrowed during the fourweek reinforcement works Special features of the project include • Installation was only possible from below • For the most part only partial closures of the motorway was necessary • Train traffic could continue without restriction 7 REFERENCE PROJECTS