Dernbach tunnel

from Wikipedia, the free encyclopedia
Dernbach tunnel
Dernbach tunnel
Dernbach tunnel
An ICE 3 leaves the south portal of the Dernbach tunnel
use Railway tunnel
traffic connection High-speed route Cologne – Rhine / Main
place Dernbach
length 3305 m
Number of tubes 1
Largest coverage 46 m
location
Dernbacher Tunnel (Rhineland-Palatinate)
Red pog.svg
Red pog.svg
Coordinates
North portal 50 ° 27 ′ 52 "  N , 7 ° 45 ′ 50"  E
South portal 50 ° 26 ′ 45 "  N , 7 ° 47 ′ 53"  E

The Dernbacher Tunnel (also: Tunnel Dernbach ) is a tunnel on the high-speed line Cologne – Rhine / Main . With a length of 3,305 m, it is the second longest tunnel in the high-speed section of the route after the Schulwaldtunnel . It bears the name of the municipality of Dernbach , the western edge of which it passes under in the central area. In the north, the tube passes under the four lanes of the federal motorway 48 at the Dernbacher Dreieck , in the middle and in the south the federal motorway 3 each .

The tunnel accommodates two slab tracks that can be driven on as planned at 300 km / h.

course

The north portal is at km 83.841 directly north of the Dernbach triangle, the south portal at km 87.146 near the southern A-3 crossing.

In front of the north portal, the route runs in a cut . In the tube, the route runs in a continuous left-hand curve falling in the gradient towards the south. In the northern section, below the Montabaurer Höhe , an overburden of up to 46 m is achieved. Further south, a fuel and gas pipeline will be driven under with little overburden. In about the middle of the tunnel and near the south portal, the federal motorway 3 will be driven under twice. The cover in the middle of the tunnel is around 20 m. In the southern area, the K 149 district road is crossed. Landesstraße 312 runs above the south portal. Montabaur train station follows south of the tunnel .

The tunnel has three emergency exits :

At the entrance to the central emergency exit (at 50 ° 27 ′ 0.1 ″  N , 7 ° 46 ′ 58.4 ″  E ) a memorial was erected "out of gratitude for the accident-free work in 1998-2000".

  • Emergency exit north

  • Emergency exit middle

  • Emergency exit south

geology

The tunnel is located in the Rhenish Slate Mountains , with occurrences of Devonian sandstones , quartzites and claystones .

In the northern area, which was driven by mining, the structure runs through weathered slate formations . In the southern section, which was driven by mining, the tunnel is surrounded by tertiary clays , silts and slate decomposed by loose rock .

In the area of ​​the southern A-3 crossing, the tube lies in a tectonic shear zone with deep softening of the mountains. Despite a wide range of measures, the roadways subsided up to 35 cm deep during the construction phase , which, due to a wide subsidence hollow, did not lead to traffic obstructions.

history

planning

At the end of 1995 the planned length of the structure was 3285 m. This length was also planned for the tunnel at the end of 1997.

In 1999 and early 2000 and 2002 the length was given as 3,305 m.

construction

The tunnel is part of the middle section in Lot B of the new line and was built by the ARGE KDD ( Arbeitsgemeinschaft Kutscheid, Dernbach / Deesen ) consisting of six companies .

The construction site was set up between the two subsequent mining drives. Driving began in June 1998. The tunnel was originally scheduled to be christened in early June 1998, but was postponed to mid-September due to the ICE accident in Eschede .

The tunnel was finally, officially the first tunnel structure of the new line in Rhineland-Palatinate on 11 September 1998 struck . Around 500 guests attended the ceremony when Hess christened the tunnel in honor of the founder of the order Katharina Kasper Katharina-Kasper . State Secretary Günter Eymael was among the guests . More than 1000 people then took the opportunity to visit the tunnel as part of an open tunnel day .

Due to the small overburden, the structure was erected in the northern area over a length of 505 m using the open or top- cover construction method ; The cover was founded flat over a length of 345 m and then mined under it. At the northern end of the tunnel, below the Dernbacher Dreieck, the two northern lanes of the A 48 were openly crossed under, the two southern lanes ( Frankfurt - Koblenz and Koblenz - Frankfurt) were protected using mining techniques. The undercrossings are 28 and 48 meters long, with an overlap of four to seven meters.

The open area, between the two pairs of carriageways, is followed by the first of two mining sections with a length of 1,505 m, which was driven over a length of 1,395 m using the dome jacking with spike protection. When going under a water protection zone II , with the drinking water extraction system Schöne Aussicht (a former ore mine), special measures had to be taken. At a total of 2,340 m, the structure crosses water protection zones of levels II and III. The minimum distance to the Schöne Aussicht pump shaft is around 73 m.

Subsequently, the underpass of the district road (120 m length) was built using the open top construction method and 130 m using a sloping construction pit (so-called construction pit south ). In the following mining section (880 m), an elm tunnel was used due to unfavorable soil conditions. In the south, a 145 m long section was built using the cut-and-cover method under the protection of a back-anchored building pile porch. In the area of ​​the elm tunnel drive, the cover was 15 to 18 m.

In order to be able to complete the shell within two and a half years as planned, an intermediate approach ( construction pit south ) was set up in the middle of the tunnel, south of the northern A-3 crossing . One of the two emergency exits was later built in this area. Due to the deeply softened Devon rock and a neighboring dam on the A-3, this area was secured with bored piles up to 30 meters deep and 1.20 m in diameter. The groundwater in this area was lowered below the level.

During the construction phase, the motorway route for the underpass of the Dernbacher Dreieck was to be laid over a length of 5000 m for 31 months. Landesstraße 312 was led over an auxiliary bridge during the construction period.

While the tunneling work was still going on in other areas, the construction of the inner shell, the reinforcement and an all-round seal began from the intermediate approach and from the south portal in each case in a northerly direction.

The breakthrough between the intermediate attack and the northern section took place on June 2, 1999. According to a source, Sister Roberta, representing the tunnel godmother , Provincial Superior Christeta Hess from the Dernbach monastery, triggered the last demolition. Another source speaks of a 20 cm thick wall that Ms. Hess pushed through herself at 11:30 a.m. using a tunnel excavator. It was the first breakthrough on the route in Rhineland-Palatinate.

At the beginning of 2000, after 18 months of tunneling, the last breakthrough followed.

In gratitude for the accident-free construction work, a wayside shrine was consecrated on December 12, 2000 during a ceremony.

The late completion of the tunnel is considered to be one reason for the late completion of the new line project.

80,000 cubic meters of concrete were used to expand the tunnel. A total of around 480,000 m³ of material was excavated.

Web links

Commons : Dernbacher Tunnel  - collection of images, videos and audio files

Individual evidence

  1. ^ DB Netz AG tunnel. (PDF) DB Netz, August 2, 2018, accessed on September 2, 2018 .
  2. ↑ Without author: Ascent and descent on a new route . In: Eisenbahn Journal , special edition 3/2002, ISBN 3-89610-095-5 , pp. 67–77.
  3. ↑ a b c d e f g h i j Ludwig Martin: A few meters below the Dernbach triangle . In: DB ProjektBau GmbH, Frankfurt (ed.): New Cologne – Rhine / Main line. Bridges and tunnels . without ISBN. Pp. 70-73
  4. ↑ a b c d e f g Bringfried Belter, Rupert Sternath, Siegfried Dauth: Tunnel structures - tender, award and technology . In: ICE new line Cologne – Rhine / Main . Hestra-Verlag, Darmstadt 2002, ISBN 3-7771-0303-9 , p. 56 f.
  5. ^ Deutsche Bahn AG, network division, project management for the Cologne – Rhein / Main line (publisher): route map for the new Cologne-Rhein / Main line . Map from November 1995, Frankfurt 1995
  6. ↑ DBProjekt GmbH Cologne – Rhein / Main (Ed.): Route map: New Cologne-Rhein / Main line , Frankfurt am Main, November 1997.
  7. ↑ a b DBProjekt GmbH Cologne – Rhein / Main, project management (publisher): New line Cologne – Rhein / Main: construction section middle section B: Selters – Brechen , brochure (20 pages), Frankfurt am Main, January 1999, p. 3, 6th
  8. ↑ a b c d carbon copies; Siebengebirge exhibition; Tunnel breakfast; Ecological balance in the Rheinaue; Fish ladders . In: DBProjekt Köln – Rhein / Main (Ed.): On the subject , Issue 1/2000, Frankfurt am Main, February 2000, p. 7.
  9. ↑ Arguments and views . In: On the subject , ZDB -ID 2115698-0 , edition 3/2001, June 2001, p. 12.
  10. ↑ a b Dernbach tunnel: No speed limit under the motorway triangle . In: On the subject , ZDB -ID 2115698-0 , edition 6/2000, December 2000, pp. 9-11.
  11. ↑ a b Open Tunnel Day in Dernbach . In: On the subject , ZDB -ID 2115698-0 , issue September 1998, p. 7.
  12. ↑ a b Start of construction of the Cologne / Bonn airport link; Erection of a wayside shrine at the Dernbach tunnel . In: On the subject , ZDB -ID 2115698-0 , edition 6/2000, December 2000, pp. 7–8.
  13. ↑ Without a source
  14. ↑ Relocation of the motorway for narrow alignment . In: On the subject , ZDB -ID 2115698-0 , issue April 1998, p. 10 f.
  15. ↑ According to plan on the longest construction site in Germany . In: DBProjekt Köln – Rhein / Main (Ed.): On the subject , Issue 4/1999, Frankfurt am Main, August 1999, pp. 4–7.
  16. ↑ Without author: Timeline - Chronology of a route . In: Eisenbahn Journal , special edition 3/2002, ISBN 3-89610-095-5 , p. 86 f.
  17. ↑ a b On the subject , ZDB -ID 2115698-0 , special edition 2002, pp. 20, 24.
  18. ^ DBProjekt Köln – Rhein / Main (Ed.): Green light for airport connection; Round table in the Westerwald; Tunnel construction: the miners get started . In: On the topic , ZDB -ID 2115698-0 , issue June 1999, Frankfurt am Main, p. 10 f.
  19. ↑ tunnel breakthroughs; Full closure of the A 3; New alluvial forest; TV thriller in the Fernthal tunnel; Primary school builds biotope . In: On the subject , ZDB -ID 2115698-0 , edition 2/2000, April 2000, pp. 6-8.
  20. ↑ Announcement of the new Cologne − Rhein / Main line goes into operation in 2002 . In: Railway technical review . 48, No. 3, 1999, p. 97.
  21. ↑ Without author: The project for the new Cologne – Rhine / Main line . In: Eisenbahn JOURNAL: Tempo 300 - The new Cologne – Frankfurt line . In: Eisenbahn Journal , special edition 3/2002, ISBN 3-89610-095-5 , pp. 34–63