Völkermarkt Wild Bridge

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Coordinates: 46 ° 39 ′ 40 "  N , 14 ° 38 ′ 53"  E

Völkermarkt Wild Bridge
Völkermarkt Wild Bridge
Facing northeast
use Access to the B 70 in the direction of Graz and Klagenfurt
Convicted Mühlgraben near Völkermarkt
place Völkermarkt in Carinthia , Austria
construction Arch bridge
overall length 157 m
width 14 m
Longest span 70 m
height 40 m
Load capacity 1500 t
building-costs 2.6 million euros
start of building 2007
completion 2010
opening 2010
planner Ingenieurgesellschaft KHP Leipzig, Wörle Sparowitz Ingenieure und Ingenieurbüro Zimmermann, Kuss und Partner
location
Völkermarkt Wildlife Bridge (Carinthia)
Völkermarkt Wild Bridge

The Wildbrücke Völkermarkt is a road bridge named after the company für Präzisionstechnik Wild GmbH in Völkermarkt in Carinthia ( Austria ). It crosses a small valley floor east of the municipality and is primarily used for works traffic ( logistics by the company Wild), but also for the general connection to the B 70, which runs between Graz and Klagenfurt . The unique selling point of the bridge is the 70 m wide arch spanning the valley, made of ultra-high strength concrete (UHFB) , which was unique in the world when it was completed in 2010. Experts estimate the useful life of this building material from which this structure was built to be over 200 years and compare it with the properties of granite .

prehistory

The expansion of the Wild company in the first decade of the 21st century, whose factory premises are on the eastern edge of the municipality of Völkermarkt, and the associated increased traffic in the municipality, made it necessary to find relief. As the best solution, it was agreed to build a road connection to the northeast running B70, for which, however, a small valley had to be overcome. In negotiations between the local authority Völkermarkt and the Wild company, it was agreed to submit a corresponding proposal to the state of Carinthia. After the state had agreed to support the project, the planning began in 2006, with which the engineering office Zimmermann, Kuss and Partner in cooperation with the TU Graz with Lutz Sparowitz as its specialist professor and Michael Reichel, at that time an employee of the TU Graz at Sparowitz, today KHP Leipzig - Graz branch . In the early stages of planning, nobody could have known that the Wild Bridge would ultimately become a place of pilgrimage for bridge and building construction experts. Right from the start, those involved agreed on the conceptual lightness and elegance of the bridge. And this is exactly what the lightweight UHFB construction of the bridge arch over the Mühlgraben was best suited for. According to the company, Wild contributed a third of the costs of around 2.6 million euros.

Execution

The 157 m long and 14 m wide two-lane bridge, with the exception of the arch spanning the valley, was built by Strabag for cost reasons using a conservative construction method with beams made of high-strength concrete and normal road surface.

The UHFB arch structure, on the other hand, consists of a total of two parallel polygonal individual arches with a span of almost 70 m. Both bridge arches consist of eight 16 m long bar segments (Fig. 1) and four 8 m long apex segments , which were prefabricated by the Max Bögl Group . They have a hollow box-shaped cross-section and with external dimensions of 1.20 × 1.20 m have a wall thickness of only 6 or 10 cm at the beveled corners. The bars were mounted vertically (Fig. 3) on site on both sides of the valley on the previously poured foundations with the help of thick-walled, also square node segments (Fig. 2) and then tilted against each other using the so-called arched folding method (Figs . 4 and 5). In order to be able to bend each of the four sections to the apex knot, the four knots anchored in the foundations ( fighter knots ) were provided with temporary hinge pins (Fig. 6), which were concreted in after the assembly joint. The arches were given additional stability by external tendons , which are freely tensioned in the hollow box cross-section of the bars and are deflected at the arch kinks by ducts in the junction elements. They can be exchanged individually. The assembly of the arches on site and the entire folding process only took about ten days (Fig. 7).

The condition of the bridge is continuously monitored by a monitoring system with almost 40 sensors.

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literature

  • Reichel, Michael; Sparowitz, Lutz; Freytag, Bernhard: Wildbrücke Völkermarkt - prestressed arch structure made of UHFB segment prefabricated parts, Part 1: Design and dimensioning ; in concrete and reinforced concrete construction ; Publisher: Ernst & Sohn ; 2011, issue 11, pp. 760–769.
  • Reichel, Michael; Sparowitz, Lutz; Freytag, Bernhard: Wildbrücke Völkermarkt - prestressed arch structure made of UHFB segment prefabricated parts, Part 2: Construction work, accompanying research and quality assurance ; in concrete and reinforced concrete construction; Publisher: Ernst & Sohn; 2011, issue 12, pp. 827-835.

Web links

Commons : Wildbrücke Völkermarkt  - Collection of images, videos and audio files

proof

  1. ↑ Scope of services. KHP Leipzig, accessed on April 27, 2020 .
  2. ↑ Völkermarkt Wild Bridge. (PDF) Wörle Sparowitz Ingenieure, accessed on April 27, 2020 .
  3. ↑ Who we are. Zimmermann, Kuss und Partner, accessed on May 1, 2020 .
  4. ↑ Homepage. Wild GmbH, accessed on April 27, 2020 .
  5. ↑ Volker Bidmon: UHPC a future- oriented, fascinating building material. (PDF) Province of Carinthia - Department 9, Road and Bridge Construction, pp. 7–11 , accessed on April 30, 2020 .
  6. ↑ Spectacular building with the concrete of the future. Ingenieur.de, accessed on May 1, 2020 .
  7. ↑ Home. Kommunalgesellschaft Völkermarkt GmbH, accessed on May 1, 2020 .
  8. ↑ Concrete arch bridge as part of the road connection of the WILD GmbH company to the Packer federal road B70. KHP Leipzig, accessed on May 1, 2020 .
  9. ↑ 2010 - 40 years of Wild. Wild GmbH, accessed on May 1, 2020 .
  10. ↑ Volker Bidmon: The arched folding process . (PDF) State of Carinthia - Department 9, Road and Bridge Construction, pp. 14–21 , accessed on April 30, 2020 .