Sinntal Bridge
Coordinates: 50 ° 18 ′ 55 ″ N , 9 ° 50 ′ 46 ″ E
 Sinntal Bridge
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| Convicted | Federal motorway 7 | |
| Subjugated | Sinn , State Road 2289, Sinntalbahn | |
| place | Bad Brueckenau | |
| construction | Composite steel girder bridge | |
| overall length | 755 m | |
| width | 29.5 m | |
| Longest span | 107 m | |
| height | 44 m | |
| building-costs | 51 million euros | |
| start of building | 2009 | |
| completion | 2013 | |
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The Sinntal Bridge is a structure on Federal Motorway 7 at km 595. With a length of 755 m, it is one of the large bridge structures on Federal Motorway 7.
The bridge is located in the Rhön between the Bad Brückenau / Volkers and Bad Brückenau / Wildflecken junctions . It spans the valley of the Sinn , the state road 2289, which connects Bad Brückenau with Wildflecken, the route of the disused Sinntalbahn and two farm roads . The highway route is curved in the course of the structure in plan.
The 29.5 m wide viaduct consists of a steel composite superstructure for one directional carriageway, with a total of four lanes and two hard shoulders, at a maximum height of 44 m above the valley. The first structure from 1967 had to be replaced by a new one after 46 years due to structural damage.
1967 bridge
The girder bridge was built in the late 1960s as part of the new construction of the then so-called Rhön motorway and was completed in 1967. The construction costs amounted to 18 million DM. The 30.5 m wide bridge had a maximum height of 50 m above the valley, with a radius in the ground plan of 1100 m and a transverse gradient of 3.2%. The Deutsche Bundespost presented the bridge in 1977 on a European stamp with the theme of landscapes.
superstructure
The 770 m long, steel superstructure with a mass of 6200 t was a largely welded plate beam construction with two full-walled main girders and an orthotropic deck . It was erected in a cantilever with auxiliary assembly supports. The eight-span bridge had spans of 60 m, 80 m, 5 × 110 m and 80 m. The main girders were arranged at a distance of 20.2 m and had a web height of 4.0 m at the abutment and 5.0 m in the middle of the bridge. The transverse girders, which were arranged perpendicular to this, were 3.2 m apart, horizontal truss cross bracings were only arranged on the abutments. Above the pillars, inclined struts held the main girders in the transverse direction.
Foundation and substructure
The abutments and pillars were flat . The foundations of the 45 m high valley pillars were usually 2.5 m thick with a floor plan area of 9.3 m × 8.1 m. The substructure consisted, among other things, of seven pairs of pillars with accessible circular hollow cross-sections made of reinforced concrete . The pier diameter was 4.2 m, the wall thickness 35 cm. The pairs of pillars were not connected to one another by head bolts.
cancellation
Due to repeated cracks in weld seams due to material fatigue , the first bridge had to be replaced by a new one. Their load had increased from 7,000 vehicles a day in 1967 to six times in the 2010s. Until the completion of the new bridge in 2013, heavy transports requiring approval were no longer allowed to cross the structure in the last years of use . In addition, trucks were prohibited from overtaking, a speed limit of 60 km / h and a minimum distance of 100 m. The right-hand lane was also moved towards the center of the bridge into a less damaged area.
In April 2013, the preparatory work for blasting the structure began. Among other things, the cantilever arms of the bridge superstructure were dismantled and a longitudinal slot was made in the sheet metal in the middle of the bridge. On June 22, 2013 at 10 a.m., the old bridge was blown up, the reinforced concrete piers collapsing and the 770 m long steel superstructure next to the new building fell vertically to the ground.
Bridge from 2013
The new bridge was built between May 2009 and summer 2013 to the southwest next to the old bridge with a center distance of 46 m.
As a new construction, a steel composite bridge with two superstructures and a total of 29.5 m width for the two carriageways was erected. The 755 m long structure has a structural system in the longitudinal direction with a continuous beam with spans of 59 m, 84 m, 103 m, 3 × 107 m, 105 m and 83 m. There is a T-beam cross-section in the transverse direction . Each superstructure consists of two narrow, airtight, welded steel box girders 4.5 m high and 1.8 m wide. Cross girders connect the two superstructures, which are 14.9 m apart, to each other via the reinforced concrete pillars. The new bridge has a height of up to 44 m above the site.
The construction of the new bridge cost € 51 million, the re-routing of the motorway in front of and behind the bridge cost another € 9 million.
On December 6, 2012, the eastern bridge superstructure was opened to traffic in the direction of Würzburg. In April 2013, the traffic in the direction of Fulda was moved to this superstructure. On July 31, 2013, the Federal Minister for Transport, Building and Urban Development Peter Ramsauer officially opened the entire structure to traffic.
literature
- R. Hofmann: The Grenzwaldbrücke and the Sinnbrücke on the Rhön motorway . In: Stahlbau , year 1969, issue 8, pp. 234–240.
Web links
Individual evidence
- ^ Government of Lower Franconia: press release from January 21, 2008
- ^ Federal motorway A 7 Fulda - Würzburg BW 595b Sinntalbrücke renewal and demolition (PDF; 4.2 MB)
- ↑ From today on the new Rhön-Impuls bridge , December 6, 2012