Lechtal bridge Schongau

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Coordinates: 47 ° 47 ′ 15 ″  N , 10 ° 53 ′ 22 ″  E

Lechtal bridge Schongau
Lechtal bridge Schongau
Convicted B17 B472
Crossing of Lech level 6
place Schongau
construction Prestressed concrete - box girder bridge
overall length 566 m
width 15.35 m
Longest span 104.15 m
Construction height 3.0 m to 6.0 m
height 45 m
building-costs 21 million DM
start of building 1988
completion 1991
location
Lechtal Bridge Schongau (Bavaria)
Lechtal bridge Schongau

The Lechtalbrücke Schongau is a road bridge on Schongau municipality, about 2.5 km south of Schongau city center. The structure spans the Lech reservoir at Lech barrage 6 with two lanes and a 2.5 m wide footpath and cycle path on the northern side of the bridge and a footpath on the southern side. Federal highway 17 and federal highway 472 run across the bridge .

The bridge was built as part of a bypass road from Schongau and Peiting between 1988 and 1991 in order to relieve the through traffic with over 30,000 vehicles per day. As the most important structure on this route, it has a rising gradient of a maximum of 3.4% in the longitudinal direction from west to east and is trough-shaped with a radius of 20 km in elevation. In the ground plan, the street route runs straight in the building area. At the western abutment, the structure, which is up to 45 m high, spans the valley floor over a length of around 150 m and then the Lech reservoir, which is up to 14 m deep. The eastern abutment lies behind a high steep slope with a slope of up to 50 °. The construction costs amounted to around 21 million DM, the construction time was three years.

superstructure

View from the north
View from the east

The structure consists of a 566 m long prestressed concrete structure with six fields. In the longitudinal direction it has a continuous beam with an arched soffit as a building system. The middle three pillars are clamped into the superstructure and act with it as a frame-like structure . The spans in the peripheral areas are 76.9 m and 72.5 m, the four central openings each span 104.15 m. In the transverse direction there is a single-cell box girder cross-section with a 15.35 m wide carriageway slab and inclined webs. The construction height of the superstructure is haunched and has a cross-section height of 3.0 m in the middle of the field and 6.0 m above the pillars. The superstructure in the prepared cantilever every week as a balance beam with two 70 ton per clock CFT in lengths of 4.92 m.

Substructures

The five reinforced concrete piers , up to 32 m high, have an octagonal hollow cross-section and are optically separated into a pillar shaft and a pillar head. The pier shaft has a cross-sectional width that decreases with the height in a ratio of 1:50, while the width of the pier head increases in a ratio of 1: 5 and seamlessly merges with the webs of the superstructure with the same inclination. Movable bearings are arranged on the outer pillars and above the abutments ; the three central pillars are monolithically connected to the superstructure.

founding

The pillars and abutments are flat. This was done with the help of sheet pile boxes. For this purpose, 13 to 18 m long sheet piles were rammed into the Lech reservoir from a pontoon . After excavation to the upper edge of the stable subsoil, an underwater concrete block with a thickness of up to 6.0 m was installed. The water was then pumped out into the sheet pile wall boxes and the actual foundation concrete was installed. The octagonal foundations of the pillars have a diameter of 12.1 m and are 2.5 to 3.0 m thick.

literature

  • Federal Ministry of Transport: Bridges on the federal trunk roads 1994 . Verkehrblatt-Verlag Dortmund, ISBN 3-89273-070-9 , pp. 75-85.
  • Friedrich Standfuss, Joachim Naumann: Bridges in Germany for streets and paths, Deutscher Bundesverlag, Cologne (Germany), 2006, ISBN 978-3-935064-41-5 ; Pp. 112-113.

Web links

Commons : Lechtalbrücke Schongau  - collection of images, videos and audio files