Murrtal Viaduct

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Reichsstrasse 14 Murrtal Viaduct (1938)
use Road bridge
Convicted Reichsstrasse 14
Crossing of Murrtal
Subjugated Murr
place Backnang
construction Reinforced concrete arch bridge
overall length 403 m
width 9 m
Longest span 2 × 105 m
height 28 m
start of building 1937
completion 1938
Status destroyed April 19, 1945

The Murrtal Viaduct is a bridge structure on the federal highway 14 . It crosses the Murr valley west of the Baden-Württemberg town of Backnang in the Rems-Murr district .

First Murrtal Viaduct (1938–1945)

The first structure at this point was erected in 1937–1938 as a bypass around the city of Backnang on Reichsstraße 14. Backnang became the seat of the newly established district of the same name in the year it opened .

The viaduct consisted of two successive arches and ramp bridges on the slope. Both the superstructure and the load-bearing arch construction were made of reinforced concrete. The arch span was 105 m, the width of the structure was 9 m less than that of the current bridge. At the time it was considered one of the largest reinforced concrete arch bridges in Germany. The company Baresel from Stuttgart was commissioned with the construction .

Due to the Allied advance in the final phase of the Second World War , the viaduct was blown up on April 19, 1945 by units of the Wehrmacht .

Second Murrtal Viaduct (1949–2011)

B14 Murrtal Viaduct (1949)
Convicted Bundesstrasse 14
construction Steel arch bridge
overall length 403 m
width 11.5 m
Longest span 2 × 104.2 m
height 28 m
start of building 1948
completion 1949
Status tore off
closure August 22, 2011

After the end of the Second World War, the infrastructure had to be restored as quickly as possible. For this reason, the bridge that had been destroyed three years earlier was provisionally rebuilt in the same place from 1948. Some preserved sections of the previous structure were incorporated into the new bridge. The newly built elements had a smaller cross-section than the existing old bridge elements. The superstructure of the approach bridge was taken over from the old construction and remained made of reinforced concrete, the two large arches were built as steel arches. The bridge panel was made in a steel composite. In 1949 the viaduct was finally fully open again.

In the years 1983–1985 the structure was widened. The existing cross-sectional differences have been eliminated. The width of the superstructure is now 11.5 m throughout.

During the past few years and due to the increased traffic load, especially due to heavy goods traffic, the post-war structure had gradually reached the limits of its capacity. For this reason, a minimum distance of 50 m for trucks has applied in the area of ​​the bridge for some time. The viaduct therefore had to be repaired at regular intervals (approx. Every two years) with ongoing traffic. From November 2012 the Murrtal Viaduct was demolished. The demolition work was finished on May 8, 2013.

Third Murrtal Viaduct (2011)

Coordinates: 48 ° 56 '34 "  N , 9 ° 24' 50"  E

B14 Murrtal Viaduct (2011)
Murrtal Viaduct (2011)
Murrtal Viaduct August 22, 2011, after clearance. In the foreground the new bridge
overall length 418.6 m
height 27 m
start of building 2009 (1st lane)
completion 2011
Status completed (1st carriageway)
in planning (2nd carriageway)
planner Leonhardt, Andrä and Partner
location
Murrtal Viaduct (Baden-Württemberg)
Murrtal Viaduct

The planning of a four-lane expansion of the federal highway 14 between Backnang-Waldrems and Backnang-West was accompanied by a new construction of the Murrtal viaduct. The final construction of the new viaduct is to consist of two separate bridge structures - one structure per carriageway.

Murrtal Viaduct 2010 under construction

The new construction of the bridge designed by Leonhardt, Andrä und Partner for the first carriageway began in September 2009, to the west directly next to the existing structure. With a height of 27 m, the new viaduct is lower, but at 419 m it is 16 m longer and completely made of reinforced concrete. Visually, it adapts to the shape of the old viaduct. From a constructive point of view, it is an example of so-called semi-integral bridges , in which the structure is not divided into individual load-bearing systems, but the interactive behavior of the overall system is considered. It has two large, successive pairs of arches with spans of 107.57 m, which are followed by the two 91.88 m and 111.58 m long ramp bridges. The superstructure is a continuous two-web T-beam with a construction height of 1.20 m. The four uprights on each of the arched ribs are partly connected to the arches and the superstructure with concrete joints. The superstructure is monolithically connected to the pillars of the ramp bridges. Forced displacements of the superstructure are reduced by the low flexural rigidity of the high pillars. Some pillars had to be built 2 to 3 m deeper in order to reach the height necessary for their softness. Bearings are only available on the two abutments .

On August 22, 2011, the new bridge was opened to road traffic. After the new bridge was opened to traffic, the dismantling work for the now sixty-year-old “provisional” began.

Fourth viaduct (from 2019?)

The bridge for the second carriageway will only be built when funds have been released for the four-lane expansion between Backnang-Waldrems and Backnang-West. This took place in September 2016, the regional council of Stuttgart announced the start of construction for the second carriageway in mid-2018. After the expansion of the B14 was delayed in 2018, the start of construction of the additional viaduct for 2019 was announced in mid-2018.

Individual evidence

  1. ↑ Press release regional council Stuttgart, November 19, 2012  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. .@1@ 2Template: Toter Link / www.rp.baden-wuerttemberg.de  
  2. ↑ Murrtal Viaduct near Backnang - one loud bang and the steel arch is gone Stuttgarter Zeitung online, May 9, 2013.
  3. ^ Gerhard Mehlhorn, Manfred Curbach (Ed.): Handbook bridges . 3rd edition, Springer-Vieweg, Wiesbaden 2014, ISBN 978-3-658-03339-2 , pp. 107, 108
  4. ↑ Murrtal Viaduct officially opened to traffic ( Memento of the original from June 15, 2012 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. Press release from the Stuttgart Regional Council, August 22, 2011. @1@ 2Template: Webachiv / IABot / www.rp.baden-wuerttemberg.de
  5. ↑ Surprising customer for Backnang - the further B-14 expansion is assured Stuttgarter Zeitung, September 22, 2016
  6. ↑ Stuttgarter Zeitung, Stuttgart Germany: Minister of Transport on a construction site tour in Backnang: Hermann: B-14 expansion until 2026. Retrieved on January 3, 2019 : "We can probably start in 2019."

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