STRABAG has been selected to widen the Hochstraße Elbmarsch (K20), a viaduct section of the A7 motorway in Germany from three to four lanes in both directions.
The €200m contract will be completed by a consortium of Strabag’s subdivisions Bridge Construction and North. Construction is expected to be completed by the end of April 2027.
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The 3.84km-long, elevated motorway section is claimed to be the largest road viaduct in the country.
The elevated Hochstraße Elbmarsch section of the A7 motorway begins after a few hundred metres of exiting the Elbe Tunnel heading south, passing over Rugenberg Port, crossing two railway lines and eleven roads and paths in the Hamburg city limits. It ends at the Hamburg-Hausbruch motorway exit.
At present, Strabag is carrying out a detailed design and simultaneously has started work on site installation, demolition and removal and deep foundation.
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Strabag’s Bridge Construction and North divisions are progressing with the planning and site installation work on the underside of the existing elevated road and are expected to continue until the end of the year.
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By GlobalDataOne of the company’s subsidiaries Züblin Structural Maintenance and Bridge Construction are jointly renovating parts of the substructures and are exchanging the bridge bearings since the end of 2018.
The option to widen the viaduct was already planned and prepared when it was built in 1975.
The foundations in the port area and the connecting reinforcements on the inner sides of the bridge superstructures can now be used for the planned upgrade.
The fourth lane will be added to the inner side of each viaduct, bringing the two sections of the motorway closer together.
During the construction, very little traffic is expected to be disrupted. The widening will take place in steps to allow traffic to flow along three lanes in both directions at all times.
The upgrade will start on the carriageway in the direction of Flensburg (north), with the expected to be completed by the middle of 2024. It will be followed by the second phase, in which the widening of the lanes carriageway in the direction of Hanover will take place.
Strabag CEO Thomas Birtel said: “We are delighted to have been awarded this major German infrastructure project and are gratified by the confidence placed in the capabilities of our infrastructure construction teams.
“The widening of this busy section of the A7 motorway will improve the traffic flow on Germany’s central north-south link in the long term.”
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Strabag wins contract to widen longest viaduct in Germany. (Credit: STRABAG SE.)
