St. Kilian Viaduct
Coordinates: 50 ° 31 ′ 16 ″ N , 10 ° 45 ′ 25 ″ E
 St. Kilian Viaduct
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| Convicted | Federal motorway 73 | |
| Subjugated |
Erle , Vesser , L 3247 Suhl – Schleusingen railway line |
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| place | Schleusingen | |
| construction | Steel composite truss bridge |
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| overall length | 448.95 m | |
| width | 2 × 14.25 m | |
| Longest span | 61.5 m | |
| Construction height | 5 m | |
| height | 33 m | |
| building-costs | € 20.7 million | |
| start of building | 2004 | |
| completion | 2006 | |
| planner | Weyer Consulting Engineers GmbH | |
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The St. Kilian Viaduct is a 449 m long steel tube composite bridge .
The bridge is located at kilometer 14.2 of the federal highway 73 north of Schleusingen between the junctions Suhl- Friedberg and Schleusingen. At a maximum height of about 33 m, it spans the valley of the Erle and Vesser with the state road 3247 and the disused Suhl – Schleusingen railway line . The structure is a filigree tubular steel frame construction, which should impair the unobstructed view through the valley as little as possible. The bridge has a radius of 2700 m and a longitudinal gradient of 2.0 to 4.5%.
The structure was built between 2004 and 2006 and cost 20.7 million euros. In relation to the bridge area of 12,795 m², the costs were more than 1,600 euros / m² and were therefore roughly twice as high as for the Nahetal valley bridge , which was about the same size , a prestressed concrete construction .
superstructure
The bridge has spans of 55.35 m + 5 × 61.5 m + 49.2 m + 36.9 m. It is a total of 28.5 m wide and has a height of 5.0 m. The bridge consists of two separate superstructures, which are designed as composite framework structures. The lower chord of a 4.4 m high three-chord main girder consists of a round steel tube with a diameter of 610 mm, the diagonals are also round tubes, but have a diameter of 299 mm. The two upper chords are I-profiles with welded-on headed bolt dowels and concreted into the deck as composite beams . The reinforced concrete deck is between 23 cm thick at the end of the cantilever and 106 cm above the diagonals and is prestressed in the longitudinal direction . The support of the framework on the pillars is carried out by V-shaped inclined struts, also made of round steel tubes, which are connected to the superstructure framework by cast steel nodes at the nodes .
Substructure
The bridge has seven pairs of round piers with a flat foundation made of reinforced concrete with strength class C50 / 60. Four pillars had to be demolished in 2004 after the first 6 m long concreting section because the concrete did not achieve the required strength. With a suit of 50: 1, the supports are 1.75 m in diameter at the head. The pillars in the four central axes are firmly connected to the superstructure and thus transfer the horizontal forces of the bridge into the subsoil as a cantilever arm.
execution
The steel superstructure was preassembled field by field on site and lifted onto the pillars and neighboring auxiliary supports with truck cranes . The reinforced concrete deck slab was then produced in sections, each with a formwork carriage for a superstructure.
Worth mentioning
A dispute over the name of the bridge between the former municipality of St. Kilian and the town of Schleusingen caused a stir . The city of Schleusingen wanted the bridge to be called the "Talbrücke Erle" because the bridge is located on the municipality's territory except for one pillar. In the end, however, she could not prevail with her suggestion of naming.
literature
- Federal Ministry for Transport, Building and Development; Bavarian State Ministry - Supreme Building Authority; Thuringian Ministry of Construction and Transport: Federal motorway A 73 Suhl – Lichtenfels . Documentation 2008, p. 47
- Gundolf Denzer, Ulrich Weyer, Christof Dieckmann: The St. Kilian valley bridge - design and execution . In: Stahlbau , Volume 75, No. 2, 2006, ISSN 0038-9145 , pp. 105–116
