Fahrlachtunnel
 Fahrlachtunnel
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 West ramp with tunnel entrance out of town
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| use | Road tunnel | |||
| traffic connection | Bundesstrasse 36 , Südtangente Mannheim | |||
| place | Mannheim ( Baden-Wuerttemberg ) | |||
| length | 489 m | |||
| vehicles per day | 62,000 | |||
| Number of tubes | 2 | |||
| construction | ||||
| building-costs | 160 million DM | |||
| start of building | October 13, 1988 | |||
| completion | April 22, 1994 | |||
| location | ||||
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| Coordinates | ||||
| West portal | 49 ° 28 ′ 21 " N , 8 ° 28 ′ 50" E | |||
| East portal | 49 ° 28 ′ 16 ″ N , 8 ° 29 ′ 13 ″ E | |||
Map with all coordinates: 
The 489 m long Fahrlach tunnel is a core part of Mannheim's southern bypass . This connects to about 4.5 kilometers, as part of the B 36 , each having two through lanes per direction of travel, the east extending from Mannheim B 38a with the over the Rhine to Ludwigshafen leading B 37 in the west. It also guides traffic from the A 656 and A 6 to the A 650 past Mannheim city center. The tunnel diagonally crosses under the eastern approach routes to Mannheim main station with tracks totaling 60 m wide.
history
A forecast load of approx. 30,000 vehicles per day for the year 2000 had been calculated for the southern bypass. Since the track systems at this point were already spanned by the bridge construction of the Neckarau crossing , as well as for urban planning reasons, the decision was made in 1986 for a tunnel solution. The symbolic groundbreaking ceremony took place in October 1988. In April 1994 the tunnel was opened to traffic.
Two ramp structures with a total length of 210 m had to be built for the entry and exit. The adjoining two outer sections of the tunnel with a total length of 305 m could be constructed using the open construction method. The middle section directly under the tracks had to be driven by means of mining for 184 m. During the construction period, the train traffic had to be maintained unimpaired and without reducing the speed on 10 railway tracks to be underpassed with approx. 1100 train movements per day and 17 switch units.
The tunnel is mainly located in the groundwater, the subsoil consists of layers of gravel and sand. It was therefore a process of the ground freezing selected in which 27,000 cubic meters of soil were frozen to propel mined in the protection of the icing, the two tubes of the tunnel in a total of four segments. At that time, it was the world's largest horizontal ground freezing.
Technical specifications
- Tunnel tubes: 2
- Tube width: 10.15 m each
- Tube height: 7.4 m each
- Length: 489 m
- Sole: 17 m
additional
With the relocation of the section of the Südtangente adjacent to the tunnel in the Mannheim-Lindenhof area directly to the railway line, the connection to the Fahrlachtunnel was also changed in 2013. Around 62,000 vehicles travel on the route every day. In the area of the tunnel there is a speed limit of 50 km / h. Until May 10, 2018, there was a speed limit of 70 km / h, which was changed to increase road safety and reduce the likelihood of accidents.
Web links
- Dr. Ing. K. Dusch / Dr. Ing G. Mayer: Planning, design and execution of the Fahrlachtunnel Mannheim. (PDF 1.9 MB) Retrieved October 11, 2010 .
- Video (approx. 22 min.) About the construction of the shell of the Fahrlacht tunnel. www.bauforum24.tv, 1992, accessed on July 9, 2014 .
literature
- Mannheim and its buildings 1907–2007. Mannheim City Archives 2004