Bosruck tunnel

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Bosruck tunnel (road tunnel)
Bosruck tunnel (road tunnel)
Bosruck tunnel (south portal) before the construction of the second tube
use Motorway tunnel
traffic connection Pyhrn Autobahn
place Ardning (Styria) to Spital am Pyhrn (Upper Austria)
length 5500 m
Number of tubes 2
cross-section Full expansion
construction
Client ASFINAG
building-costs € 74 million (planned)
start of building second tube 2009
completion 2013
planner ASFINAG
business
operator ASFINAG
toll Special toll (car € 5.50)
release October 21, 1983 (1st tube)
July 19, 2013 (2nd tube)
location
Bosruck Tunnel (Styria)
Red pog.svg
Red pog.svg
Coordinates
North portal 47 ° 38 ′ 10 "  N , 14 ° 19 ′ 50"  E
South portal 47 ° 35 '24 "  N , 14 ° 20' 50"  E

The two Austrian Bosruck tunnels are named after the mountain of the Bosruck in the western Ennstal Alps . They connect the federal states of Upper Austria and Styria .

Road tunnel

Screaming brook before 1904

The road tunnel is 5,509 m long, runs largely parallel to the rail tunnel, which is around 80 years older, is part of the Pyhrn Autobahn (A9) and connects Spital am Pyhrn (Upper Austria) with Ardning (Styria) in the south. The originally single-tube tunnel was planned from 1979 to 1980, built from 1980 to 1983 by the construction companies Mayreder , Hamberger and Porr and opened to traffic on October 21, 1983.

The tunnel is operated as a special toll route and is therefore not subject to the vignette requirement . As of January 31, 2018, the special toll for a car is EUR 5.50. Payment can also be made via the video toll system.

In 2009, the construction of the second tunnel tube began. Their breakthrough took place in August 2011. For the safety of tunnel users, in addition to the seamless visual monitoring by cameras, an acoustic warning system called "acute" was implemented, which filters out atypical noises from the usual traffic noise and triggers an alarm if necessary. After the opening of the new second tube on July 19, 2013, the first tube, which had already been in operation for 30 years, was completely refurbished. Both tunnels were opened to traffic on October 19, 2015 at noon. The official opening took place two days earlier on October 17, 2015.

As early as November 3, 2015, the completely refurbished old tunnel tube was blocked for three days and thus the direction of travel to Sattledt (Voralpenkreuz). The tunnel ceiling was lowered by 10 cm over a length of 10 m. The ceiling was then supported and the tube in the wooded area was released in a single lane and with a speed limit of 60 km / h. The concrete walls were scanned in the course of clarifying the causes. As a result of the investigation, Asfinag announced that the false ceiling had slipped due to a lack of construction. From February 1, 2016 to March 15, 2016, work was carried out to repair the damage and to take additional safety measures. Including the lowered false ceiling, eleven areas were provided with anchor rods as a precaution, according to Asfinag (around 700 rods 66 centimeters long, made of special steel).

Railway tunnel

The construction site in 1904

The 4,766 m long railway tunnel connects the Spital am Pyhrn and Ardning stations of the Pyhrnbahn . It was built between 1901 and 1906 as part of the large state investment project " New Alpine Railways " for the Imperial and Royal State Railways after several route variants across the Pyhrn Pass had been rejected.

Since the preparatory work already on July 1, 1901 (north side) ⊙ or on July 22, 1901 (south side) ⊙ was started (23 November 1902) were at the time of construction contracts already 1,288 m Sohlstollen ascended (north side: 702 m , South side: 586 m). The prerequisite for the construction contract was that the drive on the north side should be carried out mechanically and on the south side by hand drilling. The average performance was 2.80 m on the north side and 1.40 m on the south side. Seven months were planned for the completion work. According to the program, the breakthrough should therefore have taken place on March 1, 1905 (in tunnel meter 3018 on the north side, tunnel meter 1744 on the south side), construction should have been completed seven months later (October 1, 1905). The total construction time would then have been four years and three months. Although this program of accelerating construction was changed several times and machine drilling was introduced, especially on the south side, it was impossible to meet the completion date due to the many drastic difficulties. The tunnel was not opened to traffic until August 20, 1906, which means that the planned construction time was exceeded by eleven months. The additional costs due to the water ingress, which were foreseeable at the original breakthrough date and not planned in the budget, led, after parliamentary criticism, at the end of April 1905 to the resignation of Railway Construction Director Karl Wurmb and Railway Minister Heinrich von Wittek , who had run the New Alpine Railways project.

After the preparatory work on the north and south side had been carried out by E. da Giau and L. Zateranda , the State Railway Administration awarded the entire contract to the Italian company E. Falletti shortly after the first major flood (August 14, 1902) , Zateranda & Comp, which took over the work on November 23, 1902. At this point in time, the bottom tunnel had been driven to a length of 702 m on the north side, the south tunnel was at tunnel meter 582.

The Schreiende Bach near Spital am Pyhrn, a torrent that had been a popular excursion destination until then, became waterless in July 1904 as a result of gross interventions in the groundwater conditions . After the watercourse had dried up, until an additional steam engine was put into operation (November 1904), it was necessary to switch from mechanical to manual jacking and work with restricted ventilation.

Before the tunnel breakthrough expected in May 1905, another major water ingress occurred (in the southern tunnel) on the 17th of the month. In the explosion caused by methane gas on May 22, 1905, sixteen workers were killed. Despite the necessity of a complete change in the construction process, the tube was penetrated from north to south on November 22, 1905. The lining was finished at the end of June 1906. Work on the tunnel was completed on July 31, 1906, and the building was opened to traffic on August 22nd.

From September 29, 1963, the tunnel was closed for several months in order to repair damage caused by water ingress, mountain pressure and smoke gases from the steam locomotives. In addition to the renovation, the Selzthal –Spital am Pyhrn section was electrified in order to prevent new smoke damage. The Bosruck Tunnel was reopened on May 29, 1965. From this point on, passenger trains ran between Linz on the Danube and Selzthal in diesel traction, while freight trains in Spital am Pyhrn were switched from steam locomotives to electric locomotives (or vice versa).

A new construction of the now 100 year old Bosruck tunnel of the railway is being considered. On the one hand, in a few years it will no longer meet the EU criteria e.g. B. in terms of safety, on the other hand, a new tunnel is required for a possible double-track expansion of the line. An environmental impact assessment has been running since mid-2011, with planning beginning in 2011 and planning ending in 2017, although the decision is still pending.

On February 12, 2020, ÖBB board member Matthä said that there are plans to expand the Pyhrn-Schober axis by means of selective double-track expansion in order to achieve an edge time of 75 minutes between Linz and Selzthal. The gradient in the tunnel is too great, which is why a new tunnel is to be built by 2040 to reduce the time further to 60 minutes. Costs can only be discussed after test drilling. The mountains are at least as difficult as the Semmering Base Tunnel.

literature

Web links

Commons : Bosruck road tunnel  - collection of images, videos and audio files
Commons : Bosruckunnel (railway)  - Collection of images, videos and audio files

Remarks

  1. ^ According to a different report: July 4th, 1906. - See: The opening of traffic on the Pyhrnbahn. In:  Neue Freie Presse , Abendblatt (No. 15084/1906), August 20, 1906, p. 9 f. (Online at ANNO ). Template: ANNO / Maintenance / nfpand Small Chronicle. (...) Opening of the Pyhrn Railway. In:  Wiener Zeitung , Wiener Abendpost (No. 190/1906), August 20, 1906, p. 3 f. (Online at ANNO ). Template: ANNO / Maintenance / wrz.

Individual evidence

  1. ↑ Van Suilichem, P: EXPLOSION PROOF LASER ALIGNS AUSTRIAN TUNNEL . In: Tunnels & Tunneling International . tape 11 , no. December 10 , 1979, ISSN  0041-414X ( online [accessed August 9, 2020]).
  2. ↑ Tolls in Austria. Automobile Club of Germany , accessed August 29, 2019 .
  3. ^ ORF-Online: The first tunnel was opened in 1905 ; Retrieved Oct. 17, 2015
  4. ↑ Bosruck tunnel gets "ears". In: ORF . February 23, 2013. Retrieved February 23, 2013.
  5. ^ Asfinag: A 9 Pyhrn autobahn full expansion of the Bosruck tunnel ( memento of November 8, 2015 in the Internet Archive ). In: asfinag.at. Retrieved Oct. 17, 2015.
  6. ^ ORF-Online: Opening of the second Bosruck tunnel tube ; updated October 19, 2015, last accessed April 16, 2019.
  7. ^ ORF-Online: Tunnel ceiling lowered: Bosruck tube blocked. In: steiermark.orf.at, November 3, 2015, last accessed April 4, 2019.
  8. ↑ Bosruck tunnel: renovation finished earlier. March 15, 2016, last accessed April 16, 2019.
  9. ↑ The opening of the Pyhrnbahn. In:  Neue Freie Presse , Abendblatt (No. 15085/1906), August 21, 1906, p. 8, top left. (Online at ANNO ). Template: ANNO / Maintenance / nfp.
  10. ^ Strohmann: Report, p. 2.
  11. ^ Strohmann: Report , p. 5 f.
  12. ^ Strohmann: Report, p. 7.
  13. ^ Strohmann: Report , p. 8.
  14. ^ Strohmann: Report, p. 9.
  15. ↑ Framework plan ÖBB and ASFINAG. (PDF; 805 kB) Expansion of the federal transport infrastructure for Upper Austria. (No longer available online.) Formerly in the original ; Retrieved July 30, 2012 (no mementos ).  ( Page no longer available , search in web archives )@1@ 2Template: Toter Link / www.bmvit.gv.at
  16. ↑ ÖBB: New Bosruck tunnel until 2040 orf.at February 13, 2020