Rendsburg High Bridge

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Rendsburg High Bridge
Rendsburger Hochbrücke
Rendsburg High Bridge
Main span of the Rendsburg High Bridge
Official name Eisenbahnhochbrücke Rendsburg
Crosses Kiel Canal
Locale Rendsburg, Germany
Designer Friedrich Voss
Design Cantilever bridge
Material Steel
Total length 2,486 metres (8,156 ft)
Height 68 metres (223 ft)
Longest span 140 metres (460 ft)
Piers in water None
Vertical clearance 42 metres (138 ft)
Construction begin 1911
Construction end 1913
Rendsburg-map.png
Coordinates 54°17′36.94″N 9°40′58.45″E / 54.2935944°N 9.6829028°E / 54.2935944; 9.6829028Coordinates: 54°17′36.94″N 9°40′58.45″E / 54.2935944°N 9.6829028°E / 54.2935944; 9.6829028

The Rendsburg High Bridge (German: Rendsburger Hochbrücke, officially Eisenbahnhochbrücke Rendsburg) is a railway viaduct on the Neumünster–Flensburg line that also serves as a transporter bridge. The bridge crosses the Kiel Canal at Rendsburg in the German state of Schleswig-Holstein. It is federally owned through the Federal Water and Navigation Administration that also owns and runs the canal.

Previous history[edit]

The Kiel Canal (then Kaiser-Wilhelm-Kanal) was built between 1887 and 1895 cutting through existing traffic lines including the railway line between Neumünster and Flensburg for which two parallel swing bridges were built. In 1907 it was decided to enlarge the canal and in the course of this expansion major obstacles were also to be removed.[1]

Main railway lines had right of way over ships on the canal and ships had to stop, losing about half an hour when a train passed. This was considered the major obstacle as the ships were unable to overtake and could pass each other at dedicated enlarged areas so that the traffic on the entire canal was hampered. Especially the navy pressed for a separation of traffic flows as closed bridges could delay flotillas by several hours.

In order to allow the railway line to pass above the canal, the new bridge was to have a clearance over the canal's mean water level of 42 metres. The existing tracks crossed the canal about 7 metres above the canal's water level, so the tracks had to be elevated by about 36.5 metres including additional 1.5 metres to accommodate the thickness of the lower girder. The required maximum incline of 1:150 (one metre gain in altitude per 150 metres distance) made it necessary to build elevated embankments and access bridges of about 5.5 km at each side.[1]

Design and construction[edit]

The bridge was erected between 1911 and 1913 to a design by Friedrich Voss (1872–1953) and replaced the earlier swing bridges.[2]

The steel viaduct has a length of 2,486 metres (8,156 ft) and is supplemented by embankments that bring the overall length of the structure to about 7.5 kilometres (4.7 mi). The cantilever main bridge is 317 metres (1,040 ft) long, has a main span of 140 metres (460 ft) and provides a clearance of 42 metres (138 ft) above the canal's water level.[2]

To serve Rendsburg station, situated at ground level only a couple of hundred metres from the main bridge, the railway line is routed through a large 360-degree loop on the north bank of the canal ("Rendsburg Loop").[2]

The total cost of the construction, including the relocation of railway lines but excluding work related to the elevation of Rendsburg station, was 13.4 million Mark. This figure includes 5.7 million Mark for bridges, 2.7 million Mark for the mounds and 1.3 million Mark for underpasses and the relocation of roads.[1]

Transporter bridge[edit]

The "Schwebefähre" (suspension ferry) runs daily every quarter of an hour from early morning until late at night. It covers a distance of 125 metres (410 ft) within 1½ minutes and provides the shortest connection between the municipality of Osterrönfeld and the city of Rendsburg. As this mean of transportation is especially useful to students on their way to school, larger maintenance work that requires suspension of service is coordinated with school holidays.[3]

The gondola is fourteen metres long, six metres wide and travels six metres above the canal. In recent years the nominal transport capacity has been reduced from six to four automobiles in order to factor in increased car size and weight. While the gondola is equipped with nautical equipment such as radio, radar and life-rafts, there is no prerequisite for the operator to hold a master's license for inland navigation.[3]

The only incident so far happened during a storm in January 1993. The unmanned and unlit gondola broke loose at night, was blown over the canal and collided with a ship. Fortunately both ship and gondola suffered only minor damage.[3]

See also[edit]

Gallery[edit]

References[edit]

  1. ^ a b c F. Voss; J. Gährs (1 October 1913). "Die Eisenbahnhochbrücke über den Kaiser-Wilhelm-Kanal und die Eisenbahnverlegung bei Rendsburg" [The railway high level bridge across the Kaiser-Wilhelm-Canal and the relocation of railway lines at Rendsburg] (PDF; 2.3MB). Zentralblatt der Bauverwaltung (in German). pp. 509–512. Retrieved 10 November 2011. 
  2. ^ a b c "Structurae: Rendsburg High Bridge (1913)". structurae.de. Retrieved 25 July 2010. 
  3. ^ a b c Behling, Frank (2 November 2008). "Die Eiserne Lady" [The iron lady]. sueddeutsche.de (in German). Süddeutsche Zeitung. Retrieved 30 October 2011.