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How to move 100 000 tonnes to 20 meters

If highway bridges are to be renewed at the current traffic, the tearing of the engineers, usually only the one and then the other half. However, in the case of the viaduct of Rinsdorf in the Sauerland, that's not possible, so a creative solution had to be found.

civil engineers working with concrete, cement, Sand, tons of heavy steel structures and prefabricated materials, but rather rarely with a commercially available detergent. On the web site on the A45 at Rinsdorf to the South of Siegen. There, the road builders are going to need in three years, a huge amount Spülmitel for your site, bringing a part of the bridge to Slide, but more on that later.

The A45, Dortmund and Frankfurt, often called the sour land line. The Sauerland also like to say a "Queen of the highways", because the A45 has so many bridges. In the meantime, the highway is almost 50 years old and should be renovated for several billion euros, and six lanes to be expanded.

Almost twice as heavy as the Cologne Cathedral

In Rinsdorf, a small settlement in the district of Siegen-Wittgenstein in North Rhine-Westphalia, engineers are faced with a major challenge. You have to build under traffic, a new building, which is almost twice as heavy as the Cologne Cathedral. About 100 000 tons, the weight of a half of the new motorway bridge, Cologne, is bringing a landmark, it is without foundations on 120 000 tons.

The viaduct Rinsdorf is just one of the 38 bridges that will need to be renewed. It is 486 meters long and up to 70 meters high. In 1971 Willy Brandt opened as Chancellor, together with the last part of the highway, which was then completed. When planning the end of the fifties, the authorities assumed that about 30 000 cars per day between the conurbations Rhine-Ruhr and Rhine-Main would commute. Meanwhile, more than 70 000 cars travel every day on the route, of which up to 16 000 heavy Trucks. A burden that could no longer keep the bridge in Rinsdorf permanently.

Easy and re-build the country does not want to tear down the bridge, because the traffic should continue to flow. In the case of other bridges will be built in this case, only a half torn and new. In Rinsdorf, this is not possible: The bridge is constructed of one piece, a part demolition of a page will not out of the question.

The solution: 20 metres will be built next to the carriageway, a new bridge - initially, only half as wide as planned. This new piece is finished, you will be directed to the traffic over there. The old bridge can then be blown up. Later, then built the second new half of the site of the old bridge. It is the technically most complex part of the Work. In 2022 it will be The first half of the bridge is pushed into position, complete with the up to 66-Meter-high pillars.

So that you can slide the rest tracks, the pillars of the Rinsdorfer half of the Bridge, respectively on two Sliding. On a side plates of the nonstick substance Teflon are mounted, which is also used in frying pans. On the other hand, stainless steel sheets are mounted. So that the enormous weight can really slide, add a lubricant, when it is ready. Here's the dish soap comes into play, such as Karl-Josef Fischer, head of the coordination office of the A45, explains. It is also possible to use of fat. Large hydraulic presses, the work of mm, then to millimeters. To the naked eye, the shift that should take about one to two days to be seen.

The Terrain on which the viaduct Rinsdorf, typical for the hilly Sieger - and Sauerland. Not for nothing is the Region's winter sports, is popular, especially from the Netherlands. The Road builders, however, the geography requires the highest art of engineering. "Such a lateral shifting on the Foundation level has not existed in this magnitude in Germany", - stated in the project brochure. Interesting the project is, therefore, even for the science: it is Accompanied by the construction of experts from the Technical University of Berlin.

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