Trisanna Bridge

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Trisanna bridge with ÖBB EC 662
Original version
"Wiesberger Bridge" with fish belly
Trisanna bridge during construction

The Trisanna Bridge (also known as the Wiesberg ( er ) bridge ) is a work of art of the Arlbergbahn . According to railway historians, it is considered a technical masterpiece and “Europe bridge” of the 19th century. It is located at rail kilometer 80.3 between the Pians and Strengen stations and just behind the former Wiesberg stop . Wiesberg Castle is located at the eastern bridgehead . It offers the Trisanna Bridge motif its special charm and still attracts many photographers today.

With a length of 230 m, the structure spans the entrance of the Paznaun at a height of 87 m and crosses the Trisanna and the B188 Silvretta Straße . There is also a hydroelectric power station below the bridge. The bridge has three or four stone arches on either side with nine m span and in the middle a steel tied arch bridge spanning 120 m.

Original version

In 1883 the bridge was built as part of the Arlberg railway construction. The electric lighting installed for this purpose was a sensation at the time. The construction director of the Arlbergbahn, Julius Lott , commissioned the Viennese expert Ludwig Huss to build the bridge. The technical challenge for the Huss design lay in the load-bearing capacity, which had to correspond to a freight train with pre-tensioned locomotives. Up to 400 people worked on the construction of the Trisanna Bridge. After a construction period of only one year, the bridge was completed in 1884 as the widest span railway bridge in Austria.

On September 21, 1884, train traffic over the bridge was officially started. The day before, Emperor Franz Josef took part in the ceremonial opening of a steam locomotive through the Arlberg tunnel.

Reinforcement

In 1908 the supporting structure of the Trisanna Bridge was recalculated taking into account heavy freight trains. In addition, Professor Leopold Örley from Vienna pointed out in an expert report that the ground was not stable , so that from 1911 to 1916 the main pillars and vaults were stabilized with cement mortar injections. Increasing axle loads also meant that the Trisanna bridge had to be reinforced in 1923 with a so-called fish belly girder arranged below .

Redesign

On the night of November 15th to 16th, 1964, the steel structure was replaced by a new construction. A scaffolding was erected on both sides of the bridge. The new bridge was then built on the north scaffolding, which was then pushed into the position of the old one in just 10 hours and 20 minutes. The old structure was pushed onto the auxiliary scaffolding on the south side. The move of the bridge structure with a total weight of 1600 t caused a sensation, far beyond Austria's borders.

literature

Web links

Commons : Trisanna Bridge  - collection of images, videos and audio files

Individual evidence

  1. a b c Helmut Wenzel: Railway bridge still earns respect from experts today . Ed .: ImstLokal - news from the Imst district. January 12, 2019, p. 38 .

Coordinates: 47 ° 6 ′ 58.6 ″  N , 10 ° 29 ′ 31.3 ″  E