Letziwald Bridge

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The Letziwaldbrücke (also: Lezibrücke ) is an arch bridge made of reinforced concrete in Avers , Canton Grisons . The road bridge spans the gorge of the Avers Rhine with a very flat, 66.5 meter wide arch , into which the Madrid Rhine flows about 600 meters west . It was designed by Christian Menn and built in 1959. The structure is similar to the front Rhine bridge in Tavanasa that Robert Maillart 1905 projected. At 85 meters above the valley floor, the Letziwald Bridge is one of the highest bridges in Switzerland .

The 76-meter-long and around six-meter-wide structure has a 22-centimeter-thick deck. The arch is 4 meters wide and has a 25 centimeter thick plate. The arch bridge is stabilized by the interaction of arch and deck girder. The stiffening of the bridge is mainly due to the strong arch. Based on the Salginatobel bridge, this has a variable height and merges monolithically with the slender deck girder. The static support system is a very flat three-hinged arch with an arrow ratio of around 9.6. This gives the structure a dynamic appearance, a “tense concentration - like a wildcat leaping over the Letziwald Bridge over the steeply sloping gorge. The dominance of the arch both from a static and visual point of view underscores the courageous building of bridges in topographically difficult terrain. "

The bottom plate of reinforced concrete arch was on a lightweight, cantilevered falsework concreted of wood. On the hardened, free-spanning arch slab, the webs of the arch cross-section and the roadway girder were then manufactured.

Individual evidence

  1. ^ National map of Switzerland , 1: 25,000, 1255 Splügenpass, ISBN 978-3-302-01255-1
  2. ↑ a b c Caspar Schärer and Christian Menn (eds.): Christian Menn. Bridges (text in German and English) , Scheidegger & Spiess, Zurich 2015, ISBN 978-3-85881-455-5 , p. 57.
  3. ↑ Heinrich Figi: Christian Menn: bridge builder , Society for civil engineering, S. 54, online at Google Books
  4. ↑ a b c d Caspar Schärer and Christian Menn (eds.): Christian Menn. Bridges (text in German and English) , Scheidegger & Spiess, Zurich 2015, ISBN 978-3-85881-455-5 , p. 60.
  5. ↑ Josef Schwartz, Toni Kotni: Transparency, stringency and lightness - elegance in bridge construction (PDF). In: Werk, Bauen + Wohnen , 5/2010, p. 20 f.

Coordinates: 46 ° 28 '39.8 "  N , 9 ° 29' 39.7"  E ; CH1903:  seven hundred and fifty-seven thousand eight hundred and fifty-six  /  149445