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Pilot project in Oberhausen applies high-strength precast concrete elements in the replacement of two urban bridges on highway A516 and promises to shorten the total intervention time by 34 months
The German city of Oberhausen, in North Rhine-Westphalia, has become an open-air laboratory for a method that could reshape how large cities deal with the replacement of deteriorated bridges. Under the guidance of the state-owned Autobahn, a pilot project tests the large-scale use of high-strength precast concrete to reduce construction time from 24 months to just seven for each structure. In total, the two bridges involved save 34 months of open construction in a fully urban area.
The experiment is being applied to the Teutoburger Straße bridge, which carries highway A516 over a densely populated area of Oberhausen, and to a second structure on the same route, which crosses Drei Linden Straße. Previous inspections had concluded that the remaining lifespan of the first bridge would extend only until 2027, a deadline further reduced by subsequent damage. The Autobahn’s forecast is to complete the work and reopen traffic by the end of June.
The problem: aging urban bridges and traffic that cannot stop
Replacing infrastructure in urban areas is often a logistically painful operation. Bridges typically span streets, railways, or busy avenues, forcing responsible agencies to choose between prolonged closures or fragmented executions, both of which come with high social costs.
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Thousands of houses in Brazil have slabs and pillars concreted with construction site mixers, and most owners are unaware that, without strict control of the dosage, this can compromise the structure’s strength and create risks that only appear years later, according to engineers and technical standards.
In the case of Oberhausen, the situation was even more delicate, as the A516 crosses the urban grid and the Teutoburger Straße bridge had guaranteed lifespan only until 2027, with new damages emerging during inspections.
The adopted solution combined two basic principles: executing the work in halves, preserving part of the traffic, and industrializing the production of the deck as much as possible, transferring to the factory stages that would traditionally be done on-site.
How the precast system applied to the bridges works
The new superstructure is formed by elements of high-strength precast concrete, produced off-site and transported to the construction site as ready-made pieces. On-site, they are joined into a continuous beam through overlapping joints, a technique that ties the pieces together and makes them work as a single structural element.
According to the Autobahn, the technique eliminates the joints between the individual segments of the bridge and forms a continuous deck slab, a characteristic that is often difficult to achieve in conventional bridges built section by section. In addition to saving time, the approach tends to reduce future maintenance points, as structural joints are traditionally areas prone to infiltration and significant wear.
Schedule: demolition in January, beams lifted in March, release in June
The schedule for the Teutoburger Straße bridge illustrates well the pace proposed by the method. The demolition of the first half was carried out in January 2026. The substructures, including the abutments, were completed at the beginning of this month.
In the week starting March 23, the most sensitive phase of the operation was planned: the lifting of 24 precast elements, each weighing between 106 and 120 tons.
During the installation of the beams, the traffic interruption in the urban section is estimated to last only five days, a reduced time compared to typical blockages of conventional reconstruction works. Since this is an intervention executed half and half, part of the flow on the A516 and the streets under the bridge continues to operate throughout the process.
Savings of 34 months in the set of the two bridges
The most striking data from the project is in the calendar. According to the numbers released by the Autobahn, each bridge is expected to have a construction period reduced from 24 months to 7 months, a reduction that, when added to both structures, results in 34 months less work in the urban network.
For a city crossed by a highway, this means less time for detours, less impact on local commerce, lower fuel consumption due to alternative routes, and much less exposure of drivers to active construction sites.
Transparent acoustic barrier and 3D printed concrete
In addition to the precast elements, the project incorporates other technologies in simultaneous testing. One of them is the MetaWindow system, a transparent acoustic protection solution developed by DB Bahnbaugruppe.
The proposal is to improve the entry of natural light into the protected areas without compromising noise performance, a valuable characteristic in urban sections where traditional opaque barriers tend to create a sense of confinement and reduce the brightness of neighboring roads.
The bridges will also receive concrete elements produced by 3D printing, such as the steps of the slopes. The use of additive manufacturing in infrastructure works is still uncommon, and the Oberhausen pilot serves as a showcase of how these technologies can be combined in a single intervention.
Total cost of 47 million euros
The planned investment for the reconstruction of the two bridges is 47 million euros, an amount that covers not only the main structures but also 300 meters of retaining walls and approximately 450 meters of acoustic barriers installed along the stretch.
If the deadlines and technical results are confirmed, the model tested in Oberhausen should serve as a reference for future operations on urban structures under similar traffic pressure and expired lifespan.
And you, do you believe that a method based on precast concrete like that of Oberhausen could be adopted in the construction of urban bridges in Brazil? Leave your comment.
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