Main bridge Volkach
Coordinates: 49 ° 51 ′ 53 ″ N , 10 ° 13 ′ 11 ″ E
| Main bridge Volkach | ||
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| use | Road bridge | |
| Convicted | State Road 2260 | |
| Subjugated | Main , km 306 | |
| place | Volkach | |
| construction | Tied arch bridge | |
| overall length | 199 m | |
| Longest span | 120 m | |
| building-costs | € 17 million | |
| start of building | 2009 | |
| opening | September 3, 2011 | |
| location | ||
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The Main Bridge Volkach is a road bridge that spans the Main between Volkach and Astheim in Lower Franconia at river kilometer 306 . The structure has two lanes and a shared footpath and cycle path.
history
In the 19th century, until the opening of the first bridge in 1892, the Astheim Main ferry was operated between Volkach and Astheim. In August 1890, the Volkach community finally commissioned the Würzburg construction company Friedrich Buchner to build a stone arch bridge for 245,000 marks . The foundation stone was laid on October 13, 1890, the inauguration ceremony on August 21, 1892. To finance the construction costs, most of which had to be borne by the community, a bridge toll had to be paid until 1938 . A bridge house was specially built on the Astheim side for this purpose.
In order to enable Volkach to be connected to the railway network, in 1908 the municipality had to allow the Bavarian State Railways as an advance payment to run the single-track section of the Main Loop Railway from Seligenstadt to Volkach over the bridge free of charge. Rail operations began on February 14, 1909. A barrier post next to the customs house closed the structure to road traffic when a train crossed the bridge.
On April 7, 1945, German troops blew up the old Main Bridge and completely destroyed the structure. In the years that followed, until the new bridge was completed, another ferry took over the transport across the Main.
In August 1947, construction began on the new combined road and rail bridge, for which a temporary steel superstructure from the “Roth-Waagner” system of the Wehrmacht was planned. First the demolition of the remains of the blown bridge was carried out. In November 1947 the foundation stone was laid and by April 1948 the four new pillars and the two abutments had been concreted. This was followed by the assembly of the steel superstructure in the cantilever . The carriageway was relocated by early 1949. The construction costs amounted to 750,000 DM . The new Main Bridge was inaugurated on March 6, 1949. The building owner of the permanent temporary construction was the Free State of Bavaria .
Since it was also used as a railway overpass to connect the train station and an oil storage facility in Volkach, the Deutsche Bundesbahn contributed to the maintenance costs in accordance with a contractual agreement from 1953. In 1959, the bridge superstructure was raised by 1.69 m as part of the expansion of the Main to a large shipping route in order to have a clear height of 6.4 m for shipping at the highest navigable water level. The old customs house was demolished and a three-storey gatekeeper's house was built, which lost its function from 1971 due to a new automatic barrier system operated by the train crew with a key (DB 21).
On September 30, 1991, the bridge was closed to rail traffic for technical reasons after an oil train had crossed the structure for the last time on the same day. In 1993, the Deutsche Bundesbahn finally canceled the shared use agreement from 1953.
Among other things, in 1992 and 2000, most recently on November 2, 2010, ships collided with the bridge piers. Due to the poor state of construction of the bridge, which is used by 9,000 vehicles every day, an arched tied bridge was erected below the old bridge between 2009 and 2011 as a replacement, which no longer has any pillars in the shipping profile. The implementation took place within the framework of a public private partnership . Part of the financing of the approximately 17 million euros for the 535 m long section of State Road 2260, the construction and maintenance for 25 years is assumed by the construction company, the Bavarian state pays its pre-financed portion in ten annual installments from the completion of the construction project. The old bridge was demolished except for the western abutment and the bridge keeper's house. The groundbreaking for the new building was on September 18, 2009. On September 3, 2011, the opening ceremony for traffic took place. An approximately 3 m high steel sculpture by the Munich sculptor Werner Mally, the so-called “Nepomuck Strudel”, was erected on the Volkach bridge side as part of Art in Architecture. The new bridge was built without railroad tracks. The museum trains on the Mainschleifenbahn, which run according to the timetable of the private association “Mainschleifenbahn”, end in Volkach-Astheim.
construction
Bridge from 1892
The first bridge over the Main was a stone arch bridge . The 195 m long structure had a 4.5 m wide carriageway and had six arches with 30 m clear width each. Quarry stone masonry with ashlar cladding was used as building material . A statue of the patron saint Nepomuk stood on the north side of the bridge above the central pillar .
Bridge from 1949
The 1544 t heavy superstructure was a steel auxiliary railway bridge, the construction principle of which was developed by the Viennese bridge construction company Waagner and Biró and the engineer officer Friedrich Roth during the First World War . The so-called bridge device was a standardized segment system of lattice parts connected to one another like a grid. The parts weighing up to 600 kg were connected in the nodes with a large number of high-strength screws. The main girders on both sides were designed as parallel girders with a system height of 4.0 m and a post spacing of 3.0 m.
The bridge had five openings with spans of 31.5 m in the two end spans, 40.5 m in the adjacent spans and 45 m in the middle opening. In the longitudinal direction, the 189 m long bridge was constructed as a continuous beam . In the transverse direction it had a trough cross-section with the roadway below. The superstructure rested on concrete pillars. Road traffic took place on a 5.2 m wide reinforced concrete slab, grooved rails were installed in between for rail traffic and a cantilevered, 1.5 m wide walkway attached to the main structure on the north side of the bridge for pedestrians.
Bridge from 2011
The bridge with a total span of 199 m consists of a western foreland bridge with one opening and 26 m span, an eastern foreland bridge with two openings and 24.5 m span each, and a 120 m span. With a width of 12.65 m between the railings of the main bridge, there is a 7.5 m wide carriageway, upstream a 3.65 m wide shared footpath and cycle path and downstream a 1.5 m sidewalk. The approach bridges are prestressed concrete structures with a single-web T-beam cross- section and a construction height of 1.35 m. The river bridge, a steel tied arch bridge construction with a reinforced concrete composite deck, has a total height of 21.6 m with an arching of 18.4 m. The roadway of the arch bridge is suspended from the arch with twelve hangers made of round steel on each side. The clear height is 6.5 m above the highest navigable water level. The structure was assembled on the Volkacher Ufer and swam across the Main on October 23, 2010 with a pontoon and self-propelled platform truck .
literature
- Georg Wolfgang Schramm: The Main Loop and its Railway. A contribution to the traffic and economic history of the Volkacher Mainschleife. Karl Hart, Volkach 2008, ISBN 978-3-930840-15-1 .
Web links
- mainpost.de: Volkacher Bähnle has a big birthday, 13. February 2009
- mainpost.de:End after 60 years: Main bridge will be demolished, March 9, 2009
Individual evidence
- ^ Government of Lower Franconia: Resolution passed for the renewal of the Volkach Main Bridge. PI 084/08 - March 13, 2008
- ↑ Main-Post: Starting shot for 13 million project article from March 13, 2008
- ↑ Main-Post: Groundbreaking ceremony for 16.7 million articles on September 18, 2009
- ↑ Main-Post: 1892, 1949, 2011: Volkach celebrates the third inauguration of the bridge Article dated September 4, 2011
- ↑ Michael Braun: Railway auxiliary bridges, a footnote from Deutsche Bahn. In: Bautechnik , Volume 83, 2006, pp. 214–223.