Oberau tunnel

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Oberau tunnel
use Road tunnel
traffic connection B 2 , B 23 , E 533
place Oberau
length 2971 m
Number of tubes 2
construction
Client Federal Republic of Germany
building-costs € 204 million for the entire bypass, including € 161 million for the tunnel
start of building 2015
completion 2021
planner Motorway Directorate South Bavaria
location
Oberau tunnel (Bavaria)
Red pog.svg
Red pog.svg
Coordinates
North portal 47 ° 34 ′ 6 "  N , 11 ° 8 ′ 37"  E
South portal 47 ° 33 ′ 3 "  N , 11 ° 7 ′ 46"  E

The Oberau tunnel is a road tunnel that is intended to relieve the main thoroughfare of the municipality of Oberau . This is intended to counteract the high volume of traffic on Bundesstraße 2 between the end of the Bundesautobahn 95 near Eschenlohe and the four-lane bypass around Farchant .

Problem situation

The average traffic load on federal highway 2 in the Oberau area is 26,000 vehicles per day. The peak loads on the weekends are significantly higher, up to 45,000 vehicles per day. So far, this has led to frequent and long traffic jams, especially on skier weekends and during vacation travel times. Numerous residential buildings on the B 2 within Oberau are directly affected by this high volume of traffic.

history

The oldest plans for a bypass around Oberau go back to the 1970s. The traffic load for the through-town had intensified further after the A95 motorway to Eschenlohe was completed in 1982. The implementation of the tunnel project is largely due to the commitment of the citizens' initiative for traffic relief Oberau (VEO) . This had fought for the tunnel and the bypass for over 15 years.

The plan approval procedure was completed by the government of Upper Bavaria on February 11, 2010. Financing was approved by the Federal Ministry of Transport in July 2014.

Conception

With the new four-lane construction of the Oberau bypass, together with the planned four-lane expansion between the end of the autobahn at Eschenlohe and Oberau ( Auerberg tunnel ) and the existing four-lane Farchant bypass ( Farchant tunnel ), the federal autobahn 95 will actually be brought up to the local border of Garmisch-Partenkirchen in the form of a motor road (B 2 new). In the further course of the road, the road through the districts of Garmisch and Partenkirchen is to be relieved by two further tunnels ( Kramer tunnel = B 23 new for Garmisch and Wanktunnel = B 2 new for Partenkirchen).

The 4.2 km long bypass around Oberau begins in the north with a junction to which the federal highway 23 is to be connected in the future . For this purpose, the B 23 will be relocated by continuing to build this road from the hairpin bend (Ettaler Bergstrasse), which is located near the Oberau swimming pool, above ground in a northeastern direction along the slope to the new Oberau-Nord junction. Immediately after the Oberau-Nord junction is the twin-tube tunnel to the southwest, which goes around and under the town in the west. The route comes to the surface again in the south of Oberau and connects to the already developed section of the B 2 near Farchant. The new Oberau-Süd junction is being built here, a half-connection with the traffic connections from Garmisch-Partenkirchen to Oberau and vice versa.

Both tubes (one for each direction of travel) each have two lanes with emergency walkways on both sides. The lane width is 7.5 meters. While the northern 140 meters of the tunnel will be constructed as a rectangular cross-section using the cut-and-cover method, the adjoining 2.8 km long southern tunnel area has a vaulted cross-section that is largely constructed using mining techniques. The center distance of the two tubes is within the normal range of 40 meters. These are connected at a maximum distance of 300 meters with a total of 5 accessible and 5 drivable rescue crosscuts. Opposite the cross passages that can be driven on, 40 meter long breakdown bays will be arranged on the outside of the tunnel. Emergency call stations that are integrated into the outer walls of the tunnel are located at a maximum distance of 150 meters. The acceleration and deceleration lanes at the Oberau-Nord junction extend around 200 meters into the tunnel and require the tunnel cross-section to be widened by 3.5 meters per tube.

The west tube of the tunnel will have a length of 2971 m, the east tube a length of 2910 m.

Construction phase

Preparatory work for the rehabilitation of the former landfill in the area of ​​the new Oberau-Nord junction began at the end of 2011 . The official start of construction for the tunnel was on September 1st, 2015. On November 25th, 2017 the breakthrough of the west tube took place, on December 19, 2017 the breakthrough of the east tube took place. The structural work is expected to be completed in mid-2020. The work on the technical equipment of the tunnel will then be carried out. In parallel to the tunnel construction, the construction of the north and south buildings required for tunnel operation as well as the construction of the route and bridge for the two new junctions and the connection to the existing B 2 will take place from 2018. The overall completion of the Oberau bypass is planned for the end of 2021.

In order to explore the mountain conditions, extensive mountain outcrops were created in the course of the tunnel planning. The boundary conditions in terms of geology and hydrology are very different. The southern and northern parts of the tunnel are largely located in solid rock (limestone and dolomite) that is not very permeable to water. The tunnel is covered by the mountains for up to 120 meters. In the middle area, the tunnel passes under highly water-permeable layers of loose rock (gravel) in the Gießenbach valley with a minimal overburden of only 7 meters . In addition to the difficult driving conditions resulting from this, the groundwater level there can rise abruptly during heavy rain events and sometimes rise above the excavated floor. To protect the construction site from flooding, massive dewatering work is planned by means of drilled wells that are driven from the surface of the site to a depth of 45 meters.

The Swiss construction company Marti Holding AG was awarded the contract for the construction work .

The former biathlete Magdalena Neuner has taken on the sponsorship of the tunnel. It will therefore be called the Magdalena Tunnel in the future .

Until the Kramer Tunnel is completed, the Oberau Tunnel will be the longest road tunnel in the Free State of Bavaria . Once completed, the tunnel will be one of the 10 longest road tunnels in Germany .

See also

Web links

Individual evidence

  1. ↑ a b c Groundbreaking for the Oberau bypass ( memento from October 25, 2015 in the Internet Archive ); in: Bayerischer Rundfunk from September 1, 2015
  2. ↑ Half a billion for the tunnel trio ; in: Süddeutsche Zeitung Online from July 31, 2014
  3. ↑ Long traffic jams threaten on Sunday ; in: Augsburger Allgemeine from July 11, 2013
  4. ↑ Green light for Oberau bypass ; in: tz Munich from February 18, 2010
  5. ↑ Green light for Oberau bypass ; in: Augsburger Allgemeine from July 29, 2014
  6. ^ Oberau: A tunnel for the divided village ; in: Merkur Online from August 30, 2015
  7. ↑ The long-awaited Oberau bypass is now being built ; in: Augsburger Allgemeine from August 31, 2015
  8. ↑ The first 50 meters of tunnel ; in: Merkur Online from September 24, 2015
  9. ↑ First tunnel breakthrough in Oberau made in Merkur.de, last updated on November 26, 2017
  10. ^ Tunnel Oberau: breakthrough number two done in Merkur.de, December 19, 2017
  11. ↑ Magdalena Neuner is tunnel godmother ; in: Merkur Online from December 23, 2015