Kronprinzenbrücke
Coordinates: 52 ° 31 ′ 19 ″ N , 13 ° 22 ′ 33 ″ E
| Kronprinzenbrücke | ||
|---|---|---|
 |
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| use | Road bridge | |
| Convicted | Konrad-Adenauer-Strasse | |
| Crossing of | Spree | |
| place |
Berlin districts Tiergarten and Mitte |
|
| construction | continuous steel beam | |
| overall length | 75.22 m | |
| width | 22.62 m | |
| Headroom | 4.5 m | |
| vehicles per day | 170 trucks 9,300 vehicles |
|
| building-costs | 34 million DM | |
| start of building | 1992 | |
| completion | 1996 | |
| planner |
Santiago Calatrava , PSP engineering office |
|
| location | ||
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The Kronprinzenbrücke is a road bridge that spans the Spree and connects the Mitte and Tiergarten districts with the government district in the Mitte district of Berlin . The structure crosses Konrad-Adenauer-Straße, the continuation of Reinhardtstraße, with two lanes and cycle paths and footpaths on both sides. The day care center of the German Bundestag and the Spreebogenpark are directly connected to the western end of the bridge .
history
The forerunner was a wooden bascule bridge , called bridge in Thiergarten or Thiergarten bridge , built in 1709 below the Schönhauser Graben . With the construction of the excise wall in the years 1734–1737, the substructure was moved to this bridge. The bridge leading at right angles to the Tiergarten Bridge over the Schönhauser Graben branching off from the Spree was called the Unterbaum Bridge. In 1828 the bridge was moved up the river and a new sub-tree bridge, also as a wooden bascule bridge, was built above the Schönhauser Graben. 1877–1879 the construction of a new bridge on the (western) Kronprinzenufer followed , which owes its name to the then German Crown Prince Friedrich Wilhelm . The structure was a wrought iron truss arch bridge with three openings and a width of 22 m. The middle arch had a clear width of 18.68 m, the two outer arches were each 15.48 m. The pillars and abutments consisted of clinker masonry , partially clad with granite, the foundations of concrete .
During the Second World War , the Kronprinzenbrücke was badly damaged in the spring of 1945 and provisionally repaired again after 1945. With the construction of the Berlin Wall in 1961, the bridge was closed and lost its importance as a traffic structure, as the Spree was the sector boundary here. In 1972 the bridge superstructure was torn down, the pillars and abutments remained.
New building
As early as April 1991, an international competition for the reconstruction of the Kronprinzenbrücke was announced. The first prize went to a design by the Spanish-Swiss architect Santiago Calatrava , which was realized with structural modifications. It was the first new bridge to be built over the former sector border after the political change .
construction
The new Kronprinzenbrücke is a filigree, three-span steel bridge with a total span of 75.22 m. The main opening has a span of 44.0 m, the edge openings span 15.61 m. The supporting structure consists of a steel orthotropic deck , the cross members of which are supported by two parallel pipes with an outer diameter of 1016 mm. These main girders are supported by uprights that are inclined outwards at intervals of 2.75 m on an inclined tubular steel arch with an outer diameter of 368 mm. The intermediate pillars , on which the tubular steel arches are supported with spherical bearings, are bow-shaped as inclined pyramids. The steel tube node consists of cast steel parts . The intermediate pillars are founded with the help of pile head beams made of reinforced concrete on 24 bored piles with a diameter of 90 mm.
Assembly
The bridge superstructure with a total tonnage of around 800 t was largely delivered by ship from Belgium in 16 parts with a maximum weight of 85 t and welded together on site at an assembly area. Then the insertion of the superstructure on carried floating pontoons and the Einschwimmen spree upward into the final position.
Guidance device
The impact of the ship, which is relevant for the design of river bridges, was not taken into account by Calatrava, and a navigation control device to avoid a ship impact on the filigree pillar construction was not included in the original design. The design of the construction was also assigned to Calatrava. The approximately 5.5 m high tail post are clamped over a length of 1.7 m in 6.0 m long driven piles. The thick, dark ramming beams largely hide the view of the architect's actual pillar construction.
lighting
The bridge lighting was elaborately designed by Calatrava. Four high and ten low lighting masts, forty lamps in the curb steps and lamps integrated in the railings illuminate the roadway. The underside of the bridge is illuminated by eight lighting fixtures integrated into the bridge piers.
building-costs
The bridge construction was awarded for construction costs of 22 million DM. However, it was only after the award that it became clear that Calatrava's design could only be implemented with structural and structural changes, which ultimately led to a construction delay of two years. The construction costs came to DM 34 million in the end, based on 1790 m² of bridge area, this results in an amount of around DM 19,000 / m².
Structural damage and renovation
The lighting devices installed on the bridge as part of the architectural concept did not prove themselves in everyday life, vandalism and collision damage led to their continued failure. Provisional lane lighting had to be installed to ensure road safety. A permanent solution for the luminaires with complete retention of the architectural design has not yet been found. In addition, in the course of the building inspection, damage to the coating as well as corrosion damage were found, which require extensive repairs to the bridge and should be carried out together with the repair work on the lighting. The total costs are estimated at around 600,000 euros, including around 300,000 euros for the complete replacement of the lighting.
literature
- Hans Eisel, Henning Jahn, Oddvar Nymoen, Gerhard Sedlacek: Realization competition for the reconstruction of the Kronprinzenbrücke . In: Steel construction 65 . Year 1996, issue 12, pp. 523-530.
- Reiner Hartmann, Henning Jahn, Dieter Riese, Wilfried Provoost: Special features of the production and floating assembly of the steel superstructure of the Kronprinzenbrücke in Berlin . In: Steel construction 65 . Year 1996, issue 10, pp. 368–376.
Web links
Individual evidence
- ↑ Traffic volumes for trucks in 2014 . Road traffic census 2014 as of October 16, 2015 (pdf)
- ↑ Traffic volume map DTV 2014: vehicles in 24 hours
- ↑ Thiergartenbrücke on the sub-tree and sub-tree bridge on the sub-tree in Charitéstraße . In: CF Wegener: House and General Address Book of the Royal. Capital and residence city Berlin , 1822, part 1, p. 7.
- ↑ For a long time nothing bridged. Georg Küffner, . In: FAZ No. 139 of June 19, 2018, page T 1, accessed on June 22, 2018
- ↑ Land is in sight when the bridge is being built . In: Berliner Zeitung , November 21, 1995
- ↑ Kronprinzenbrücke at the Senate Department for Urban Development
- ↑ Vandals destroyed all lamps: Kronprinzenbrücke remains in the dark . In: Der Tagesspiegel , December 3, 2007
- ↑ Printed matter 18/18338. (PDF) Berlin House of Representatives, April 11, 2019, accessed on April 26, 2019 .