Auditunnel

The Audi tunnel is a twin-track railway tunnel in the high-speed line Nuremberg -Ingolstadt in the north of Ingolstadt. It crosses a portion of the factory premises of the Audi AG ( hence its name ), and other commercial and residential areas. With a length of 1258 meters ( kilometer 84.995 to 86.253 ), he is the second shortest of the nine tubes of the new line. The originally planned 1138 meters long tunnel was extended by 120 meters to the north.

The design and conduct

The tunnel runs in an S-shape towards Nuremberg initially in a right turn followed by a straight line and a curve to the left. The tube takes two tracks in slab track with a mass -spring system in order to reduce the transmission of vibrations to the overlying industrial plants. A special feature is the slab track system Rheda classic in trough design, which in the region of the new line only in the section of the Audi tunnel ( km 84.6 to 86.6 ) was used.

At the close tunnel in both directions ramps. The southern ramp to 317 meters in length, in which also run the tracks of the train station Ingolstadt Nord at the high-speed line, marks the beginning of the new line to Nuremberg. Here begins, for example, the fixed track and the special overall management of the high-speed line. The range top speed rises to 160 kilometers per hour in the tunnel of 130. To the north ramp (395 meters) to a curve connects behind the range top speed increases to 300 kilometers per hour. This tunnel is now the only of the new line, which can not be scheduled to sail with 300 kilometers per hour.

In the tunnel and the train station Ingolstadt Nord Entry Signals are housed.

Security concept

The safety concept of the high-speed line was the Audi Tunnel attention, as the tube is not in a natural slope as only the track and even with the roof profile - could be interpreted - an artificial slope towards the center. Thus, trains can not simply roll out in an emergency without drive with the brakes released. Also, gases are heavier than air, so do not pull off by itself.

( 1000 meters otherwise ) equipped For this reason, the 1258 -meter-long tunnel was a total of four Nottreppenhäusern at a distance of up to 330 meters. In contrast to the other tunnels of the new line and the portals are counted as exits. This may result for the Audi tunnel six emergency exits, which are described in detail below; the numbering is from south to north in ascending order:

• As one emergency exit emergency stairs at the south portal ( 86.281 kilometer ) are referred to.
• Emergency Exit 2 leads from route km 85.974 in the northeast area of the Ingolstadt Northern station at 48 ° 46 '46 "N, 11 ° 25' 40 " O48.77944411.42789 to the surface.
• 3 emergency exit is located at kilometer 85.688 and arrives at the Ingolstadt- Carl -Zeiss-Straße 48 ° 46 ' 55 "N, 11 ° 25' 38 " O48.78202511.427314 outside.
• Access to the emergency exit 4 ( 85.449 km ) on a publicly accessible company parking lot of Audiwerke at 48 ° 47 '3 " N, 11 ° 25' 41 " O48.78427511.427925.
• Emergency Exit 5 is located on the northern outskirts of Ingolstadt (near the Oskar -von-Miller -Straße), north of the Audi factory premises at 48 ° 47 ' 13 " N, 11 ° 25' 41 " O48.78699711.427952. The output has two entrances at km 85.128 and 85.143 in the running tunnel.
• The northernmost emergency exit 6 leads outside the tunnel, about 15 meters north of the tunnel portal ( 85.012 kilometers ) west of the tracks on an overhead door at 48 ° 47 ' 16 "N, 11 ° 25' 39" O48.78791411.427452 to the surface.

The tunnel has a separate positive pressure ventilation to keep the emergency exits in case of fire smoke free. In addition to a smoke detection system, a gas alarm system were installed on the tunnel floor. The security light is always turned on.

Emergency exit 3 at the Carl -Zeiss-Straße

Emergency exit 4 on the Audi company parking lot (in the background visible )

Emergency Exit 5, just a few meters south of the north portal

Access from the trough structure for the emergency exit stairwell 6

History

Planning

The construction of a tunnel in the area of ​​Audiwerke was by train information is not mandatory. Firstly, such a fragmentation was prevented, an urban development in this area is so still possible. Secondly, as a height- free threading of the new line in the middle of the North Station was possible. The construction of the tunnel, it was structurally easier to integrate the additional tracks of high-speed line in the track system of the North Station. The tracks of the route Treuchtlingen - Munich and freight transport must not be so unnecessarily crossed.

Mid-1989, the building was planned with a length of 1720 m. Mid-1994 were 1138 m. The tunnel should be done by both portals.

The Audi tunnel was awarded as a separate contract section on September 3, 1998 to a consortium under the leadership of Walter Bau ( Augsburg) and Dywidag. In addition, the company Helit Woerner Bau AG and Dywidag belonged to the executive working group. The project was part of the 5,379 -meter-long contract section node Ingolstadt, which also includes the introduction of Ingolstadt, which included the renovation of the North Station and the installation of an additional track to the central station. This section has been calculated in mid-2000 with about 280 million DM.

In 1999, a total length of 1,270 m had been provided ( 1,970 meters with ramps ). The working group presented a special proposal for a " top-down method under compressed air " in front, who was commissioned. The completion of the tunnel was mid-2000, scheduled for early 2002.

Construction

Before beginning construction work had a number of lines, including an oil pipeline to be laid. The first earthworks began in February 1999.

The tunnel was posted on December 14, 1999. It was the last start of construction of a tunnel of the new line. The work under compressed air began in March 2000. Tunnel patron acted as Sigrid Paefgen, wife of former Audi chairman Franz -Josef Paefgen. The tunnel was named Sigrid tunnel during construction. The tunnel concrete structure was constructed between August 2000 and October 2001. The building shell was completed in spring 2002.

Due to the proximity to the Audi factory and their sensitive measuring equipment all construction work had to be carried out free of vibration. On blasting therefore had to be completely waived during construction. Since the construction site is located in the groundwater of the nearby Danube, the use of compressed air and the pumping of ground water seepage were necessary, among other things. Due to the sensitive industrial facilities that are under crosses, settling in particularly were to be avoided. At a length of 1070 meters, the tube was built using the top construction with compressed air; on the southern 188 meters the building without pressure could be built in both open and partly cover method. The periodic pressure was 1.0 bar, sometimes at up to 1.3 bar Due to the location of the southern ramp in Ingolstadt Nord Bahnhof had here during the construction phase repeatedly the track 6 are umverlegt.

Costs

The total cost was estimated at about mid-2000, DM 78 million.