Beckenried Lehnen Viaduct

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Lehnen Viaduct near Beckenried with a view of Lake Lucerne

The Beckenried Viaduct is part of the A2 motorway near Beckenried in the canton of Nidwalden , Switzerland . It lies between the Beckenried junction and the north portal of the Seelisberg tunnel and has been the second longest motorway bridge in Switzerland since the Viaduc d'Yverdon was built.

Data

The bridge with a total length of 3,150 m (3,147.5 m) was completed in 1980. The costs (KVA) amounted to 61.3 million CHF (1979). The individual spans are 40.1 + 55.2 + 2 × 55.1 + 52 × 55.0 + 47.0 + 34.5 m and result in a total span of 3,147 m in the bridge axis. It has a superstructure height of 3.0 m, the superstructure width above is 2 × 10.9 m and the superstructure width below 2 × 4.5 m. Approx. 20,000 vehicles pass through the building every day (especially the main part of Gotthard traffic).

The bridge panel was constructed as a box girder made of prestressed concrete with an advancing armor, the pillars made of reinforced concrete , which are in up to 70 m deep shafts on the slope, as this is unstable. There is a speed limit of 100 km / h.

The two bridge superstructures are divided into five sections with four expansion joints , whose lengths from west to east are 491, 715, 715, 715 and 514 meters.

geology

Almost its entire length of the viaduct is located in a geologically problematic area of ​​a creeping slope. As a result, the pillars had to reach down to the healthy rock and be protected with protective shafts. A slope renovation was also inevitable. This also included the setting of the eleven streams in the area of ​​the viaduct slope. In the area of ​​the Ischenwald, a 530 meter long rock tunnel even had to be cut to drain the landslide mass below.

literature

  • DJ Bänziger : The Beckenried Lehnen Viaduct. Verlag Dietikon / Baufachverlag AG, Zurich 1981, ISBN 3-8559h
  • Dialma Jakob Bänziger : The Beckenried Lehnen Viaduct. In: Concrete and reinforced concrete construction. 75: 18-25 (1980).

Web links

Individual evidence

  1. ↑ The Beckenried viaduct. 1981, p. 58; Total length of the main bridge 3,150 meters
  2. ↑ Page no longer available , search in web archives: Federal Roads Office (FEDRO): Roads and Transport 2005/2006, facts and figures. P. 16.@1@ 2Template: Dead Link / www.astra.admin.ch
  3. ↑ Christian Menn: Lecture bridge I . Zurich 1979, p. A6.

Coordinates: 46 ° 57 ′ 40 "  N , 8 ° 29 ′ 45"  E ; CH1903:  680,473  /  201654