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| A complete order for Doka's Nuremberg Branch: The 12 piers and the pier-heads, both abutments and the superstructure were all formed using Doka formwork equipment only. |
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The 183 km long A 38 autobahn between Halle and Göttingen is one of seven interregional trunk road projects envisaged by the 1991 “German Unity Transportation Projects” programme. Its westward continuation gives the industrial regions of Saxony a direct fast road link to the Ruhr.
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The Y-shaped piers, with their conically tapering shafts, tower up nearly 40.0 m from the valley floor. They were constructed using Doka climbing formwork MF 240, fitted with pre-assembled elements of Doka large-area formwork Top 50. By taking this choice, the JV opted for a formwork solution that embodies high dimensional accuracy and streamlined working cycles. Other benefits include the ease with which the formwork can accommodate widely varying shapes and inclinations, and the fast repositioning times that are possible by crane. For the pier-heads, Doka came up with special Top 50 elements designed using CAD-3. Because of the large overhang of the "arms" of the Y-piers, Doka supporting construction frames were mounted to the shaft in the horizontal to serve as working platforms.
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The superstructure of the Thyratal Bridge crosses 13 openings, with spans ranging between 70.0 m and 90 m. The steel composite box girder has now been moved into its final position and lowered into place - with last-millimetre accuracy. The next, crucial phase of work will be the construction of both the carriageways, with an overall width of 29.0 m. For structural design reasons, it is not possible to work continuously from one end of the bridge to the other here. This is why the JV is casting the carriageway decks in an irregular "back-step" sequence using two Doka composite forming carriages. Each of these carriages measures 30 x 30 m and so provides approx. 900 m² of forming area.
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| The two forming carriages for the Thyratal Bridge, built mainly of standard components, testify yet again to the flexibility of Doka formwork systems. |
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Says Dipl.-Ing. (FH) Matthias Glaser of the Composite Bridge Expertise Centre in Maisach: “When we were designing the solutions, we used standard components wherever we could, so as to keep the construction company's costs as low as possible.”
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The cantilever arm formwork - supported from below by working platforms made of Doka supporting construction frames - was also designed by the Doka team entirely from standard components. This design reduces penetration of the carriageway to only one anchoring point per cantilever arm, greatly simplifying and reducing the amount of work needed for finishing the surface of the concrete. Matthias Glaser: “This is something to which our clients attach very great importance, as it helps them to speed up the workflow.”
The importance of good, close co-operation is also confirmed by Contractors' Supervisor Dipl.-Ing. Werner Saxer: “I've been working with Doka in the bridge-building field for over five years now. Every time, I come away very satisfied at how expertly the projects are planned, serviced and carried out – even when things get complicated.”
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| The hollow piers, with their hexagonal cross-section and flared Y-shape, were constructed using climbing formwork MF 240. |
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Contractors: JV of Bilfinger Berger AG + Brückenbau Plauen
Formwork consulting: Doka Nuremberg Branch and Doka Composite Bridge Expertise Centre, Maisach
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