Replacement of the Rader Hochbrücke bridge progresses successfully. Top speed at the highest technical level.
Since the award of the contract by DEGES on December 05, 2022 for the A7 Replacement Bridge Rader Hochbrücke BL 3.1, all parties involved have been working with extraordinary dedication to achieve the ambitious target of completion by November 30, 2026.
Despite an extremely tight preparation and planning schedule, the first work began shortly after the contract was awarded. Just one month later, the first site preparation activities were carried out, followed by the timely erection of the first temporary structure (central longitudinal shoring), including planning, just three months after the contract was awarded - an achievement made possible by the close and cooperative collaboration with the client and the inspector.
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Innovative idea from Implenia shortens execution time
The hydraulic construction site in Lake Borgstedt, a branch of the Kiel Canal, deserves special mention. Here, three piers have to be erected in the water, their foundations consisting of 40-meter-deep bored piles that have to be installed from the water. Thanks to an innovative proposal from Implenia (increasing the diameter of the bored piles and thus possibly reducing the number of bored piles), the execution time can be reduced.
Another challenge is the non-load-bearing ground at the top of all the foundations in the water, which is as much as 25m deep on one axis. In order to "place" the special foundation engineering equipment, which weighs several tons, on the water, two jack-up platforms from England are used, which, with the help of their long legs (solid steel tubes), are able to transfer the high weights into the low-lying load-bearing subsoil.
The successful execution of the work on the hydraulic engineering site would not be possible without the close cooperation with Implenia Spezialtiefbau. Implenia Construction is providing and coordinating the entire water logistics, consisting of a pusher vessel, various pontoons, barges and the aforementioned jack-up platforms.
On June 15, 2023, the first bored pile was successfully completed with concreting. The construction time for the installation of the bored piles in the water is expected to be around 6 months.
In addition to the hydraulic construction site, other exciting and technically challenging tasks lie ahead in the near future, including the construction of the alternating hybrid piers to be built on the Kiel Canal. With a height of 50 meters and 40-meter-long cantilevered concrete coves, these piers are unique in the world in this dimension. Their load-bearing function is realized in conjunction with the steel superstructure above, which is pushed over the piers using the incremental launching method.
Sönke von Fintel, head of the Hamburg office and project manager of ARGE RHB, is very proud of the team's performance as well as the on-time progress of construction: "We would like to thank all those involved in the project for their close cooperation in a spirit of partnership, which has enabled this challenging construction project to progress smoothly."