Lorraine railway viaduct

The Lorraine viaduct (alternatively railway viaduct Bern ) is a 1092 m long viaduct in the city of Bern, which was opened to traffic in 1941. It leads among other things, railroad Bern- Olten between Bern and Bern- Wylerfeld the station on the River Aare. The railway official name of the bridge is Lorraine, without the addition viaduct. When commissioning the Lorraine viaduct was the longest railway bridge in Switzerland, this title went with the opening of Käferberg line 1969 to the 1126 m long viaduct Hardturmstraße.

The viaduct was built in the years 1936-1941 under the four-track realignment of the railway line. Among other things, the building replaced also serving as Aarequerung Red Bridge of 1858, which could not be crossed by two trains at the same time at the end.

The structure consists of a bridge section with four consecutive bridges, which were mostly made ​​with reinforced concrete and have a continuous gravel bed. These are the 400 m long viaduct thalweg trough, which has as a building system is a frame structure with usually spans of 27.07 m. It follows the 199 m long viaduct Lorraine plateau with a fungal ceiling construction and spans between 7.5 m and 11.06 m. The 327 m long Aarebrücke is an arch construction as the main bridge. The final viaduct Schützenmatt spans the Schützenmattstrasse and Schützenmatte and Neubrückstrasse and is 199 m long. The separation of the individual bridges are at the abutments or separating columns, where the longitudinal stretching of the bridges is collected.

The 327 m long main bridge over the River Aare is a pure reinforced concrete structure. It consists of a 150 m wide span arch bridge made ​​of reinforced concrete and two-sided access ramp bridges with spans of typically 27 m. The clamped arch has a pang of 33 m. It has a three-cell, 13,35 m wide hollow box cross -section which is 3.2 m high in fighter 5.0 m and at the apex. The 17.4 m wide road has a vierstegigen -beam cross -section with about 3.5 m depth of system. The bow was made ​​with a cantilevered wooden falsework, which owned a span of 146 m and consisted of twelve trusses with construction heights of up to 3.6 m.