Lorraine Viaduct

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The part of the Aare bridge of the Lorraine viaduct
The Talwegmulde viaduct with the Aare bridge in the background

The Lorraine Viaduct (alternatively also Bern Railway Viaduct, but not used in the local press or the population) is a 1092 m long viaduct in the city of Bern , which was opened to traffic in 1941. Among other things, it runs the Bern – Olten railway between the Bern railway station and Bern-Wylerfeld over the Aare . The official name of the bridge is Lorraine , without the addition of a viaduct. When it was commissioned, the Lorraine Viaduct was the longest railway bridge in Switzerland, and this title went to the 1126 m long Hardturm Viaduct when the Käferberg Line opened in 1969 .

The road- Lorraine bridge is located upstream parallel to the Lorraine Viaduct .

history

The viaduct was built between 1936 and 1941 as part of the four-track re-routing of the railway line. Among other things, the structure also replaced the Red Bridge from 1858, which was used to cross the Aare and which ultimately could no longer be used by two trains at the same time. On June 12, 1941, the endurance test with twenty steam locomotives took place.

construction

The structure consists of a bridge with four bridges following one another, most of which were made with reinforced concrete and have a continuous ballast bed . These are the 400 m long Talwegmulde viaduct , which as a structural system has a frame construction with standard spans of 27.07 m. This is followed by the 199 m long Lorraine Plateau viaduct with a mushroom ceiling construction and spans between 7.5 m and 11.06 m. As the main bridge, the 327 m long Aare bridge is an arched construction. The final Viaduct Schützenmatt spans Schützenmattstrasse and Schützenmatte as well as Neubrückstrasse and is 199 m long. The individual bridges are separated at the abutments or dividing pillars, where the longitudinal expansion of the bridges is absorbed.

The 327 m long main bridge over the Aare is a pure reinforced concrete structure . It consists of a 150 m wide arched bridge made of reinforced concrete and access ramp bridges on both sides with standard spans of 27 m. The clamped arch has a pitch of 33 m. It has a three-cell, 13.35 m wide box girder cross-section, which is 5.0 m high in the transom and 3.2 m in the apex. The 17.4 m wide carriageway has a four-web T- beam cross- section with a construction height of around 3.5 m. The arch was made with a cantilever wooden falsework that had a span of 146 m and consisted of twelve trusses with construction heights of up to 3.6 m.

Lorraine Viaduct under construction

  • Construction of the wooden falsework : February 16, 1938

  • March 2, 1938

  • April 26, 1938

  • April 26th: View from the Red Bridge

  • Preparing parts of the wooden falsework at the municipal riding school

  • June 12, 1941: Endurance test with 20 steam locomotives

literature

  • Orth: A new railway bridge over the Aare near Bern. In: The civil engineer. Issue 9/10, 1939, pp. 131-132.
  • Christian Menn: Reinforced concrete bridges . Springer-Verlag Vienna, 1990, ISBN 3-211-82115-5 .
  • Reconstruction or relocation of the Lorraine line. In: The Bern Week. Buchdruckerei Jules Werder, Bern, February 8, 1930, p. 1 , retrieved on May 17, 2019 (Volume 20, Issue 8 - Pictures variants of the route).

Web links

Commons : Lorraine Viaduct  - Collection of images, videos and audio files

Individual evidence

  1. ^ Adolf Bühler : The relocation of the Wylerfeld-Bern railway line to the Lorrainehalde . Schweizerische Bauzeitung, Volume 103 (1934), Issue 23 (E-Periodica, PDF 2.0 MB)
  2. ↑ Swiss Rail Network, 1980 edition, page 103
  3. ↑ Hugo Hürlimann, Sébastien Jacobi: The end of the steam epoch in Switzerland . Verlag = AS Verlag edition. Zurich 2004, ISBN 3-909111-04-1 , p. 124-128 .

Coordinates: 46 ° 57 ′ 14 "  N , 7 ° 26 ′ 31"  E ; CH1903:  600252  /  200312