Schindgraben viaduct

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Schindgraben viaduct
A71-Talbruecke-Schindgraben.jpg
Technical specifications
length 464 m
Max. Span 47.5 m
Superstructure width 2 × 14.25 m
Construction height 3.2 m
Max. Height above valley 55 m
system Prestressed concrete box bridge

The Schindgraben Viaduct is a 464 m long bridge on Autobahn 71 .

The structure is located at kilometer 144 between the Suhl motorway triangle and the Meiningen- Nord motorway junction and crosses the Schindgraben at Rohr . A limestone quarry in operation and state road 1140 from Rohr to Meiningen are spanned at a height of a maximum of 55 m with ten fields. The bridge has a circular radius of 3800 m in plan. The longitudinal gradient is a constant 0.8% to the north. The overpass with two separate superstructures was built between 2000 and 2002 at a cost of around 9 million euros.

Foundation and substructures

The abutments and pillars have a flat foundation . The pillars stand on the limestone, while the abutments are based on fillings. The pillars with the dimensions 5.85 mx 2.7 m are between 14 m and 48 m high. The full cross-section of the pillars is constant over the height and consists of two trapezoidal pillar heads which are connected to one another by a disc.

Superstructures

Box-girder cross-section of a prestressed concrete bridge in mixed construction

The two adjacent superstructures of the prestressed concrete bridge are continuous beams with a box girder cross-section and a constant construction height of 3.2 m. The prestressing consists of a mixed construction with internal and external tendons .

The spans for the 10-span bridge are 46.5 m + 8 × 47.5 m + 37.5 m.

execution

The bridge was built using the incremental launching method in 20 increments with regular incremental lengths of 23.75 m, with the incremental basement being 55 m behind the south abutment due to a high-voltage overhead line.

Specialty

The bridge is in a limestone quarry that is in operation . It is therefore equipped with a monitoring system that records the explosive vibrations at the pillar base and head. In addition, during the planning phase, dynamic calculations for blasting were used to define load limits and minimum distances from the pillars. In the event of blasting, the police will temporarily block traffic on the motorway because of the risk of falling rocks.

literature

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

Web links

Coordinates: 50 ° 34 ′ 58 ″  N , 10 ° 29 ′ 10 ″  E