Heidingsfeld viaduct
Coordinates: 49 ° 45 ′ 7 ″ N , 9 ° 56 ′ 39 ″ E
 Heidingsfeld viaduct
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| Convicted | Federal motorway 3 | |
| place | Würzburg-Heidingsfeld | |
| Entertained by | Autobahn Directorate Northern Bavaria | |
| construction | Composite steel bridge | |
| overall length | 630 m | |
| width | 41.5 m | |
| Longest span | 120 m | |
| Construction height | 4.6 m | |
| height | 50 m | |
| start of building | 2014 | |
| completion | 2021 | |
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The Heidingsfeld viaduct is a 630 m long bridge on Autobahn 3 near Würzburg .
The structure lies a maximum of 50 m above the valley floor and spans a valley south of Würzburg between the Nonnenberg and the Katzenberg with the Würzburg-Stuttgart railway line and the Stuttgarter Straße. As part of the six-lane expansion of the motorway, the bridge will be replaced by a lower-lying new building.
Bridge from 1963
The overpass was built between 1961 and 1963 with a joint superstructure for the two-lane Nuremberg and three-lane Frankfurt am Main carriageway. In the course of the bridge, the motorway was to the south and about 10 m higher. In plan it had a radius of 1700 m. In the elevation there was a rounding of the tub, the longitudinal slope was approximately 0.2% to 2.5% with a cross slope of 2.7%. The dismantling took place in 2018.
Foundation and substructures
The abutments and part of the pillars were built on a flat foundation . Four pairs of piers had a deep foundation with driven piles . The columns had a maximum height of 60 m and were arranged in the transverse direction at a center distance of 23 m. The reinforced concrete hollow cross-sections of the pillars were connected to one another at the heads by cross bars.
superstructure
The superstructure of the composite steel bridge consisted of two solid wall girders in the longitudinal direction at a distance of 23.0 m with a height of 5.0 m at the end of the bridge and 6.0 m in the middle of the bridge. The welded steel construction was connected to the reinforced concrete deck slab in a shear-proof manner via cross members that were arranged every 2.0 m . The span of the nine-span bridge was 64.4 m, 6 × 80.0 m, 64.0 m and 64.4 m, which resulted in a total span of 664.4 m.
During the construction of the deck in 1963, the superstructure failed to stack up, causing it to sag by 0.8 m in areas and shift by 0.13 m in the longitudinal direction. People were not harmed.
New bridge construction
As part of the re-routing of the BAB 3 in the Würzburg city area, a new viaduct was necessary. This is located north of the old structure and is about 10 m lower. The design of the motorway bridge was determined in a design competition that had no winner. A combination of the two second places is implemented, with increasing column spacing and slender pillars as well as a steel composite superstructure. 6 m high, transparent noise barriers are planned on both sides .
In April 2014 the contract to demolish and rebuild the bridge was awarded. The order value, including VAT, is around 71 million euros. The originally estimated total contract value was 66 million euros. Work on site began in the summer of 2014 and should be completed five years later in 2019. The new bridge structure will be constructed in two construction phases. First, the northern superstructure for the Frankfurt carriageway was built and opened to traffic on March 1, 2018. Then the old bridge was demolished. Finally, the southern structure is to be erected.
The 630 m long superstructures are curved in plan and consist of single-cell steel box girders with a composite deck made of reinforced concrete, which is supported outside the box girder by brackets arranged on both sides. The carriageway slabs are made over the consoles with prefabricated parts and in-situ concrete. They are 22.28 m and 20.28 m wide. The deck bridges span the valley floor at a maximum height of 50 m with seven openings and spans of 50 m, 80 m, 90 m, 100 m, 110 m, 120 m and 80 m. The construction height of the box cross-sections is 4.60 m. The foundation of the pillars is carried out on large bored piles up to 60 m long with a diameter of 1.2 m and 1.5 m. The superstructures are assembled using the incremental launching method in six increments with incremental lengths between 60 m and 125 m. The individual segments in lengths of 20 m to 32 m are delivered by truck and assembled in the cycle cellar behind the western abutment.
literature
- Edwin Helminger: Remarkable bridge structures in the Bavarian section of the Frankfurt-Nuremberg motorway . In: The construction technology. 6/1965
Web links
Individual evidence
- ↑ Motorway Directorate North Bavaria: A3 Aschaffenburg - Biebelried SIX-LINE EXPANSION (status: 05/2018)
- ↑ Autobahn Directorate North Bavaria: Announcement of awarded contracts , April 16, 2014
- ↑ a b c donges-steeltec.de: Replacement construction of the Heidingsfeld viaduct, Würzburg
- ^ Construction group: Heidingsfeld viaduct of the A 3 near Würzburg-Heidingsfeld