Freie und Hansestadt Hamburg
- Renewal of a dual-span road bridge
- Bridge over highway A24
- Span: 2 x 16.0 m
- Width: 31 m
- Clearance height: 4.50 m
- Time: 2007 – 2008
- Building costs: 2 mill. EUR
- Our scope:
structural and civil engineering
Bridge construction with traffic still running.
Rennbahnstraße is a major traffic road connecting Hamburg’s Horn und Wandsbek districts. On this section, Rennbahnstraße crosses over the A24 autobahn. The bridge was built in 1935 and widened in 1966.
The bridge had to be renewed because it could not demonstrate the stability needed for today’s requirements. The new bridge is a two-span composite girder bridge. The superstructure of the composite girder construction was executed with rolled sections and a 25 cm thick reinforced concrete slab. For the foundations of the new bridge, in contrast to the old bridge a shallow foundation was not chosen, but instead a deep foundation consisting of large bore piles in association with sloped compressed micro piles.
The works had to be carried out while traffic continued to flow along Rennbahnstraße. With this in mind, each half of the old bridge was demolished and replaced by a new one while the other half remained in use for vehicular traffic. After completion of the second half of the bridge, the two sections were joined together.
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