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The preparatory works have started for the replacement of the Grumbach Bridge along the A6 motorway east of Saarbrücken following the contract award in February to a bidding consortium consisting of ZÜBLIN Hoch- und Brückenbau GmbH, STRABAG AG and Donges SteelTec GmbH. In a first step, the underground lines are being secured and rerouted, which will be followed in early summer by the construction of the site roads and site installation areas and finally by the excavation of the construction pit, the establishment of the drilling and piling level and the drilled pile foundation. The contract value for the consortium amounts to approx. € 60 million, of which approx. € 44 million go to ZÜBLIN and STRABAG.
A total of 4,800 t of steel and 19,000 m³ of concrete will be used to build the new bridge between the St. Ingbert-West access and the Saarbrücken junction in a 40,000 m³ excavation pit. The existing structure is a 324 m long composite bridge dating from 1961. Due to material defects in the old structure, the originally planned renovation and strengthening of the bridge is not possible and its replacement became unavoidable.
Construction phases for replacement of Grumbach BridgeThe new crossing was designed as a composite bridge with two independent, adjacent structures. To ensure that two lanes per driving direction remain open to traffic during the entire construction project, a temporary bridge with a superstructure for four lanes will be erected next to the old bridge. After its completion, all traffic will be diverted onto the makeshift structure and the old bridge will be demolished to make way for the first half of the new bridge together with the roadway as well as the foundations and substructures for the second bridge-half. The traffic is then moved onto the finished first half in both directions and the superstructure of the makeshift bridge is shifted onto the new substructures. As a last step, the temporary structures are completely dismantled.
This method enables the safe construction of the bridge in a relatively short amount of time with the least possible restrictions for the 41,600 vehicles that cross the Grumbach Valley every day.
Stuttgart-based Ed. Züblin AG, with about 14,000 employees and an annual output of around € 4 billion, is one of Germany’s largest construction companies. Since its foundation in 1898, ZÜBLIN has been successfully realising challenging construction projects in Germany and abroad and today is the STRABAG Group’s leading brand for building construction and civil engineering. The company’s range of services covers all construction-related tasks – from complex turnkey construction, civil engineering and tunnelling to construction logistics, structural maintenance, ground engineering and timber or steel construction. In recent years, ZÜBLIN has been promoting the topics of digitalisation, LEAN.Construction and sustainability and – supported by the many years of experience of its Zentrale Technik competence centre – is also increasingly offering integrated design and construction from a single source as a general planner. When it comes to partnering, ZÜBLIN has set new standards with its TEAMCONCEPT® partnering model, which has proven its worth on the market for more than 25 years. Current construction projects of the company, a subsidiary of globally operating STRABAG SE, include the EDGE East Side Berlin high-rise project, the Rinsdorf and Rälsbach viaducts on the A45 motorway and the approx. 2 km long airport tunnel in Stuttgart. More information is available at www.zueblin.de.