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The structure spans the highway A2 in Basel and is divided into 5 segments with different structural systems. A part of the structure is a box girder construction, the other part is a prestressed bridge slab supported on a long wall slab. Expansion joints are located at the transitions to the access ramps and between the individual segments. The structure, which dates back to 1976, had to be repaired under constant traffic on the highway below and under limited traffic on the bridge itself.
The construction method of the 1970s is characterized by very slender concrete cross-sections, which are correspondingly heavily reinforced. Particularly in the area of the expansion joints, this reinforcement does not allow any significant intervention in the concrete, so that no classical anchoring of an expansion joint could be carried out, although considerable movements have to be accommodate.
The solution was an elastic plug expansion joint that requires only minimal intervention in the concrete. The TENSA® POLYFLEX®Advanced PU expansion joint was already proposed in the project‘s preliminary study by mageba and subsequently installed. In addition to the expansion joint‘s long service life, this system is maintenance-free and very quiet under traffic.
TENSA®POLYFLEX Advanced PU plug expansion joints
Concrete road bridge
Bundesamt für Strassen ASTRA
Aegeter & Bosshard