Neckar valley bridge Heilbronn
Coordinates: 49 ° 11 ′ 4 " N , 9 ° 12 ′ 56" E
  Neckar valley bridge Heilbronn
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| use | Federal motorway 6 | |
| Crossing of | Neckar , Frankenbahn , Neckartalstrasse | |
| place | Neckarsulm | |
| overall length | 1333 m | |
| Longest span | 131 m | |
| start of building | 2017 | |
| completion | 2019 | |
| opening | 2019 | |
| location | ||
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The Neckar valley bridge near Heilbronn, also called Neckar valley crossing Neckarsulm, is at 1333 m the longest structure on federal motorway 6 and the longest motorway bridge in Baden-Württemberg . The bridge lies between the junction of Heilbronn / Untereisesheim and Heilbronn / Neckarsulm. The motorway overpass spans the Neckar and Neckar floodplains at Neckarsulm, as well as Neckartalstraße on the western bank (Landesstraße 1100) and on the east the district road 2115 with the parallel railway line from Heilbronn to Neckarsulm .
Bridge 1968 to 2019
| Neckar Valley Bridge Heilbronn (1968) | |
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| overall length | 1350 m |
| width | 30 m |
| Longest span | 151 m |
| height | 16 m |
| start of building | 1965 |
| completion | 1967 |
| opening | 1968 |
| closure | 2019 |
The bridge train was built between 1965 and 1967 and opened to traffic in 1968.
It consisted of four individual bridges with dividing pillars in between. In the west the structure began with a three-span, 311 m long girder bridge made of prestressed concrete . The spans were 80 m in the peripheral fields and 151 m in the main field, which was supposed to bridge an unrealized Neckar breakthrough. In the transverse direction, the two superstructures had a single-cell, 7.5 m wide box girder cross-section with a minimum construction height of 4.2 m in the field and a maximum of 7.45 m above the pillars. This was followed by a 15-span, 585 m long T-beam bridge . The prestressed reinforced concrete structure had uniform spans of 39 m. The joint superstructure for both carriageways consisted of a two-web T-beam with a construction height of 3.0 m and a web width of 1.15 m. The webs had a center distance of 16.25 m with a deck width of 29.8 m. The structure was one of the first T-beam bridges to be erected without cross girders between the webs, according to the theoretical investigations of the civil engineer Hellmut Homberg . However, just seven years after completion, the webs in the support axes had to be stiffened with subsequently installed steel tubes due to damage to the bearings.
The Neckar was spanned with a two-span, 260 m long steel girder bridge. The spans were 138 m and 122 m. In the transverse direction, the main girders consisted of two box girders with an orthotropic deck slab . The construction height was a constant 4.0 m.
On the eastern bank of the Neckar, a four-span, 160 m long girder bridge made of prestressed concrete closed off the bridge. The spans were a maximum of 44 m. Due to the oblique mounting on the abutment, the two superstructures had single-cell box girder cross-sections with a construction height of 2.1 m.
Repair
Due to major damage, an extensive repair of the structure and the expansion to six lanes was carried out from March 2003 to May 2005 for 17 million euros. In addition, noise barriers were built on the north side of the bridge . In the case of the T- beam bridge, the structure was reinforced by installing carbon fiber tendons on the inside of the web at the 28 coupling joints . However, the steel bridge over the Neckar was unable to cope with the loads on the six lanes and so in October 2013 the number of lanes was reduced to four and the speed for trucks was limited to 60 km / h. A speed limit of 100 km / h applied to cars.
Bridge since 2019
The section between Wiesloch / Rauenberg and the Weinsberg motorway junction has been under construction since January 1, 2017 . This expansion also affects a new Neckar valley bridge. The first half of the bridge was completed on March 25, 2019, in time for the 2019 Federal Garden Show , which took place in Heilbronn. The complete expansion measures should be finished in 2022.
The motorway flyover must remain usable during the construction period. First, the new northern superstructure was built next to the old bridge on temporary substructures and then the traffic in both directions was directed over it. After that it is planned to demolish the old superstructures. In the third step, the new southern superstructure is to be built. After the traffic has been moved to the new southern superstructure, the final transverse displacement of the new northern superstructure is to take place in its final position.
The 1333 m long bridge consists of two structures, the 511 long Neckar bridge and the 822 long, western foreland bridge. The structures each have their own superstructure for each direction of travel with three lanes each. The 510 m long section of the structure above the Neckar is a trough bridge in steel composite construction . The lateral, wave-shaped main girders made of steel have construction heights of 3.8 m in the field area and a maximum of 8.3 m above the bridge piers. The spans are 82 m, 131 m, 126 m, 92 m and 79 m. The approach bridges have a two-web prestressed concrete slab beam cross -section with a construction height of 1.75 m. Each bridge has 22 openings with a maximum span of 38 m.
literature
- Ulrich Hammer, Dirk Müller, Lutz Bücheler: Repair of the Neckar valley bridge on the A 6 motorway near Heilbronn using carbon fiber tendons . In: Civil engineering. Issue 3, year 2005, pp. 130–141. (PDF; 1912 kB)
Web links
Individual evidence
- ↑ Wirtschaftsinfo IHK Heilbronn from June 16, 2003
- ↑ A 6 - Neckar Valley Bridge near Heilbronn. Regional Council Stuttgart, press release from October 21, 2013.
- ↑ The contract for the A6 expansion is awarded by Heilbronner Demokratie online, December 12, 2016
- ↑ https://www.rnz.de/nachrichten/sinsheim_artikel,-Sinsheim-A-6-Neubau-der-Neckartalbruecke-wird-geplant-_arid,20955.html
- ↑ weyer-ingenieure.de: References of statically or planning processed road bridges
- ↑ Proceedings 28th Dresden Bridge Construction Symposium p. 99
| Upstream | Crossing the Neckar | Downstream |
| Neckargartacher Bridge | Neckar valley bridge Heilbronn |
Weir bridge L1101 |