Seßlestal valley bridge

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Seßlestal valley bridge
A71-Talbruecke-Sesslestal.jpg
Technical specifications
length 320 m
Max. Span 87.5 m
Superstructure width 28.5 m
Construction height 4.5 m
Max. Height above valley 53 m
system Composite steel bridge

The Seßlestal viaduct is a 320 m long bridge on the 71 motorway . She was on a motorway in Germany one of the first steel composite bridges with one-piece superstructure and has 87.5 the largest span in the parallel girder bridges A 71 m wide span was required to an existing habitat to maintain the valley floor.

The structure is located at kilometer 133.5 between the Suhl motorway junction and the Meiningen- Nord motorway junction . It spans the Seßlestal in the forest west of Dietzhausen at a maximum height of 53 m with four fields. The bridge has a radius of 1200 m up to a length of 7.5 m. The longitudinal gradient to the west changes and averages 2%. The overpass was built between 2000 and 2002 at a cost of around 11 million euros.

Foundation and substructures

The abutments and pillars have a flat foundation on the red sandstone . The reinforced concrete pillars with heights between 28 m and 41 m consist of a one-piece full cross-section with the constant external dimensions of 3.5 m × 8.8 m. In the upper pillar area, this cross-section dissolves into two individual columns, which have a trapezoidal full cross-section with maximum dimensions of 3.5 m × 2.85 m. The pier heads are connected to one another by cross bars.

superstructure

The one-piece superstructure of the composite steel bridge has a single-cell open steel trough and a 28.5 m wide, 32 cm to 43 cm thick reinforced concrete deck connected with headed bolt dowels . The bottom plate of the box cross-section is 7.9 m wide, the webs of the main girders are inclined and support the deck at a distance of 10.6 m. In addition, the deck is supported on the outside by diagonal struts approximately every 5 m. The construction height of the entire superstructure is a constant 4.5 m. The span of the 4-span superstructure is 72.5 m + 87.5 m + 87.5 m + 72.55 m.

The point of rest of movement in the longitudinal direction is in the middle of the bridge, where two pillars are immovably connected to the superstructure.

execution

The steel superstructure consisted of 15 sections lengthways, which were delivered in individual parts by truck. The final welding took place on the western abutment. For the installation of the steel trough was a launching nose in the thrust method inserted m in lengths of up to 87th Finally, the reinforced concrete deck slab was produced in sections in lengths of 15 m using a formwork carriage .

literature

  • DEGES: Bridge structures in the new federal states . Ernst & Sohn, Berlin (Germany), 2004. ISBN 3-433-01700-X

Web links

Coordinates: 50 ° 36 ′ 49 ″  N , 10 ° 36 ′ 32 ″  E