Grünentaler high bridge
| Grünenthaler high bridge | |
|---|---|
 |
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| Subjugated | Kiel Canal |
| construction | wrought iron arch bridge |
| Longest span | 156.5 m |
| Clear height | 42 m |
| start of building | 1891 |
| completion | 1892 |
| Status | reduced |
| planner | Greve, Hermann Eggert |
| closure | 1986 |
The Grünentaler Hochbrücke is a combined rail and road bridge in the Grünental district of the municipality of Beldorf in Schleswig-Holstein . The structure spans the Kiel Canal and is part of the Neumünster – Heide railway line and state road 316.
Original bridge from 1892
The first bridge was built from 1891 to 1892 by the bridge construction company in Gustavsburg, later the MAN plant in Gustavsburg , over the Kaiser Wilhelm Canal, which was under construction. The design of the wrought iron arch bridge came from the railway construction inspector Greve from Kiel, the architecture of the gate towers over the abutments and the brick approach bridges by Hermann Eggert , Berlin.
The high bridge had to reach the clear height of 42 m above the highest water level , which was the same for all bridges in the canal . Since it was not possible to rule out landslides on the embankments , a relatively flat arch was chosen, which was supported on abutments above the embankments. These abutments were designed as gate towers, as they also served as supports for the roadway, which was about two thirds of the arch height.
The arch consisted of two slightly inwardly inclined crescent arches with spans of 156.5 m, the transom joints of which were located at a height of 5 m on the bases of the gate towers. The junctions were on circular arcs with radii of 135 m and 150 m and arrow heights of 25.26 m and 21.46 m. These sickle arches stiffened by half- timbering had a height of 4.1 m at the top. At the time, the Grünentaler Hochbrücke had the fifth largest span of all arch bridges in the world .
The roadway was 6 m wide and laid out with planks, later paved, and laid out for one lane each in both directions. The track of the railway line ran in the middle of the lanes. In the case of rail traffic, the bridge was closed to road traffic by barriers. Footpaths were attached on both sides outside of the arch structures.
In 1935 the tall towers were demolished. At the end of the 1980s, the structure had to be replaced by the neighboring new building, as the foundation and steel construction no longer had sufficient stability . In addition, the width of the water level of 87 m under the bridge was a narrow channel. The complete iron construction of the old bridge was lifted out of its position by the floating cranes Taklift 4 and Taklift 7 and placed on the side of the canal for scrapping.
Coordinates: 54 ° 7 ′ 29 ″ N , 9 ° 19 ′ 46 ″ E
| Grünentaler high bridge | ||
|---|---|---|
 |
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| Convicted |
Railway line Neumünster – Heide Landesstrasse 316 |
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| Subjugated | Kiel Canal , km 31 | |
| construction | Steel truss bridge | |
| overall length | 405.16 m | |
| width | 18.3 m | |
| Longest span | 187.0 m | |
| Construction height | 17 m | |
| height | 44.54 m | |
| Clear height | 42.55 m | |
| building-costs | 50 million DM | |
| start of building | 1984 | |
| completion | 1986 | |
| location | ||
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1986 high bridge
Between 1984 and 1986, the new truss-beam bridge with a clear height of 42.55 m was built in a parallel position north of the old arch bridge. On this, the single-track railway line and the two-lane road have separate routes. There is also a footpath and bike path on the southern side. The construction costs for the bridge amounted to 50 million DM, the entire construction project cost 78 million DM.
The construction is a three-span postless strut truss bridge made of steel with a total span of 405.16 m. The field widths are 109.08 m in the edge openings and 187.00 m above the canal. In the longitudinal direction, the continuous beam is the building system. With a system height of 15.5 m, the construction height is around 17 m and the bridge width is 18.3 m, with a center distance of the 1.0 m wide lattice main girders of 14.45 m. The spacing of the truss nodes is 15.58 m. The track is movably supported directly on the orthotropic carriageway slab . The bridge superstructure, which consists of 3500 t of steel, was cantilevered .
The 41.1 m high canal piers have a rectangular hollow cross-section with external dimensions of 12.0 m × 5.0 m at the base and external wall thicknesses of 1.0 m. The shafts initially taper upwards and finally widen at the pier head like a hammer head to support the canal bridge to 16.25 m × 4.7 m. The pillars stand on 17 m high caissons made of reinforced concrete, with a diameter of 23.5 m.
The foundations of the old bridge were preserved on both sides of the canal and converted into viewing platforms.
On April 14, 2011, the Tyumen-2 caused a ship accident near the bridge.
photos
Grünenthaler Hochbrücke before 1895
The high bridge near Grünenthal around 1900
At the monument of the old Grünenthaler Hochbrücke in Hanerau-Hademarschen
dito
literature
- Reinhard Stolz: The new Grünental high bridge over the Kiel Canal . In: Civil Engineer 61 . Year 1986, pp. 491-500.
Web links
Individual evidence
- ^ The bridge at Grünenthal. In: Centralblatt der Bauverwaltung . Volume XI, No. 22 (from May 30, 1891) p. 214 ( digitized , on kobv.de)
- ↑ The Ponte Dom Luís I , the Garabit Viaduct , the Ponte Maria Pia and the central opening of the Eads Bridge had larger spans (cf. Georg Christoph Mehrtens: The arched bridge over the Kiel Canal near Grünenthal. In: Centralblatt der Bauverwaltung Volume XIII, No. 15A (from April 19, 1893) p. 160 ( digital copy, on kobv.de))
- ↑ The old Grünentaler high bridge. November 16, 2008, accessed December 27, 2018 .
- ↑ Karl-Heinz Reiche: Grünthal high bridge with photos of the dismantling. On the website of Bernd Schmitt