Saubachtal Bridge (A 4)
Coordinates: 51 ° 3 ′ 38 ″ N , 13 ° 31 ′ 42 ″ E
| Saubachtal Bridge | ||
|---|---|---|
| use | Federal motorway 4 | |
| Subjugated | Wilde Sau , Wilsdruff – Meißen state road, Wilsdruff – Sachsdorf road | |
| place | Wilsdruff / Sachsdorf | |
| construction | Prestressed concrete girder bridge | |
| overall length | 262.6 m | |
| Number of openings | 6th | |
| Longest span | 46 m | |
| building-costs | 21.8 million DM | |
| start of building | 1993 | |
| completion | 1996 | |
| location | ||
|
||
| Above sea level | 249.9 m above sea level NN | |
The Saubachtal bridge is part of the federal motorway 4 and spans the Wild Sau valley north of Wilsdruff with the state road 177 and the Sachsdorfer road.
The bridge was first built between 1934 and 1936 in the section of the Reichsautobahn between Chemnitz and Dresden. The structure was blown up in 1945 and the two new bridge structures were put into operation in 1954 and 1974. As part of the expansion of Autobahn 4, DEGES had two new girder bridges built, which were completed in 1996.
location
The bridge is located around one kilometer north of the city center of Wilsdruffer, but lies entirely in the area of the neighboring municipality of Klipphausen , mainly in the Sachsdorf district . The municipal boundary between Klipphausen and Wilsdruff - and thus also the district boundary - runs immediately south of the bridge and parallel to it.
The bridge spans the valley of the Wild Sau , also called Saubach , which rises on Landberg in Pohrsdorf am Tharandter Wald and flows into the Elbe at Gauernitz . The Saubachtal bridge connects the Birkenhainer Höhe in the west with the Hühndorfer Höhe in the east of the valley .
Immediately to the west of the bridge is the Wilsdruff junction on the Birkenhainer Höhe, followed by the Dresden-West motorway triangle opened in 2001 to the east .
Bridges from 1936
| Saubachtal Bridge 1936 | |
|---|---|
| use | Reichsautobahn route 83 |
| construction | Reinforced concrete - girder bridge |
| overall length | 261 m |
| Number of openings | 9 |
| Longest span | 33.50 m |
| Clear height | 14.88 m |
| building-costs | 780,000 RM (excluding cement) |
| start of building | Fall 1934 |
| completion | Winter 1935/1936 |
| opening | September 27, 1936 |
| Status | former |
| planner | Siemens construction union |
| closure | Blown up April 26, 1945 |
The planning for the transfer of the Saubach valley began with the planning of the first part of the Reichsautobahn route 83 from Dresden to Wilsdruff. It was to be built as cheaply and quickly as possible, so that the original design for the area north of Wilsdruff only provided for a bridge over the Wilde Sau with a clear width of ten meters instead of a valley bridge . The road from Wilsdruff to Sachsdorf and the road from Wilsdruff to Meißen would each have their own overpasses and underpasses. To level the terrain, deep cuts to the west and east of the bridge and a dam within the bottom of the valley , a second “ Tanneberger Loch ”, would have been necessary.
The changed planning by the Dresden Construction Management therefore envisaged a valley bridge with a clear width of 200 meters that would have spanned both Wilde Sau and Sachsdorf-Wilsdruffer Straße, which was relocated closer to the river. The Wilsdruff-Meißener Straße was to have its own underpass structure and was to be relocated a few meters to the west. Between the two bridges, the Reichsautobahn was to be led over a now much shorter dam.
The third and ultimately realized design was submitted as a special design by the Siemens-Bauunion after the second variant had been put out to tender in the summer of 1934 . The viaduct was extended to the west and could also cross Wilsdruff-Meißener Straße. The resulting increased costs for the viaduct were offset by the elimination of the second underpass. In the course of this draft, the originally planned acceleration and deceleration lanes at the Wilsdruff junction in and from Dresden were also deleted, as they would have been on the viaduct.
Construction of the motorway bridge began in autumn 1934. Siemens-Bauunion and Beton- und Monierbau AG were involved in the construction. Deliveries to the major construction site took place via the narrow-gauge railway Wilsdruff – Gärtitz . Reinforced concrete was chosen as the building material, and the bridge itself was designed as a beam bridge. The eight 16.40 meter high pillars each consisted of three posts 7.50 meters apart and ended in a 1.60 to 2.10 meter high cantilevered frame beam, on which the superstructure after the completion of all pillars and the 22 meter wide abutment the bridge was supported. This had four main girders for each lane and reached a width of 24.40 meters at the top. Overall, the Saubachtal bridge reached a clear width of 261 meters.
After the completion of the bridge construction in the winter of 1935/36, the Saubachtal Bridge was opened together with the Reichsautobahn from Dresden-Altstadt to Wilsdruff on September 27, 1936.
At the end of the Second World War , the bridge, which was not ten years old, was blown up by the Wehrmacht on April 26, 1945 .
- The destroyed bridge in 1947
View over the Saubach valley in west direction
Opposite direction, in front the Wilsdruff-Meißener Straße
Eastern abutment with a view to the west
Workers crushing the debris
View of the total of eight main girders of the superstructure
Bridges from 1954 and 1974
Between 1952 and 1954 a new bridge with two lanes was built for the one-way road to Chemnitz, and the bridge for the one-way road to Dresden followed from 1972 to 1974. They were two-hinge arch bridges with five openings and two arched discs each.
Bridges from 1996
As part of the six-lane expansion of Autobahn 4 ( traffic project German Unity No. 15 ), the existing structures were demolished from October 1993 to March 1995 and then replaced by prestressed concrete girder bridges with three lanes and one hard shoulder per lane. The construction costs amounted to 21.8 million DM. The superstructures produced using the incremental launching method have single-cell box girder cross-sections and are prestressed in both the longitudinal and transverse directions. The spans of the six bridge openings are 41.8 meters, four times 46.0 meters and 36.8 meters, the construction height 2.9 meters.
Web links
- Thomas Haubold: Saubachtal Bridge near Wilsdruff. In: autobahngeschichte.de. Working Group on Autobahn History, January 2013, accessed on December 2, 2016 .
Individual evidence
- ^ Motorway construction in Germany - on the history of the A 4. In: autobahn-online.de. Henning Maruhn, accessed December 2, 2016 .
- ^ Road construction report 1997, p. 81
- ↑ Jürgen Stritzke: Preface , 5th Dresdner Brückenbausymposium