Offenbach City Tunnel

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Offenbach City Tunnel
Offenbach City Tunnel
Offenbach Marktplatz station
Official name Offenbach S-Bahn tunnel
use Railway tunnel
traffic connection Südmainische S-Bahn
place Offenbach am Main
length 3860 m
Number of tubes 1
construction
start of building March 23, 1988
business
operator DB network
release May 23, 1995
Coordinates
West portal 50 ° 6 ′ 18 "  N , 8 ° 43 ′ 54"  E
East portal 50 ° 6 ′ 8 ″  N , 8 ° 46 ′ 47 ″  E
w1

The City-Tunnel is a railway tunnel for two standard-gauge tracks in Offenbach am Main , which is used exclusively by the Rhein-Main S-Bahn . It is used by all lines in the eastern area ( S1, S2, S8 and S9 ) and is largely under Berliner Straße .

The maximum speed in the tunnel is 80 km / h, from the western tunnel ramp to Kaiserlei 100 km / h.

Planning variants

In the run-up to the construction of the city tunnel, five different variants were examined. Three variants provided for the extension of the Frankfurt City Tunnel in different forms , in which a tunneling under Oberrad in the southern (Var. D), middle (Var. C) and northern (Var. B) area was planned, in order to then on to thread the western Offenbach development boundary back onto the existing route (continue in the direction of Offenbach Hauptbahnhof and Offenbach Ost ). All variants would have meant - at least during the construction period, possibly also permanently through changes in the groundwater flows - a massive intervention in the agricultural usability of the areas, so that many Oberräder companies saw their existence endangered. The city of Frankfurt withdrew their original agreement to the upper wheel lines for corresponding protests.

Another variant (Var. A) provided for the line to be built largely as it was ultimately realized, but from Kaiserlei the tunnel would have been built in such a way that it would also have threaded into the existing line at the point described above. In addition to the routing implemented today, this draft also had the advantage that it did not prejudice the routing in Offenbach and also included the option of being able to react to the planned construction of a sports hall with up to 20,000 visitors by building another station later. If one of these four variants had been implemented, the City Tunnel in Offenbach would never have existed.

In autumn 1983, a cost-benefit analysis by Prof.  Gerhard Heimerl on the route in Offenbach came to the conclusion that the underground city route, despite the costs, offered greater benefits than the expansion of the existing routes in Offenbach's urban area.

Planning variants of the Offenbach inner city route of the S-Bahn

The decision for the City Tunnel in Offenbach was finally made. Today's route largely follows the route of the former local railway between Frankfurt and Offenbach, which was closed in 1955 due to insufficient profitability and demand.

Construction phase

After completion of the necessary negotiations on the financing of the project on December 4, 1986 and the necessary ratifications in the various bodies and the creation of the necessary rights by means of a plan approval decision , the prerequisites for complete construction were given at the end of 1990. However, the official start of construction took place on March 23, 1988 through a symbolic action.

In Offenbach, in addition to the "usual" problems such as intersecting supply and disposal lines, cable routes and traffic management, there was also the difficulty of not being able to build the tunnel everywhere using an open construction method using an excavation. However, 3.5 kilometers of the 3.7 kilometers long tunnel section could be built using the cut-and-cover method, and there were particular problems in the area of ​​the corner of Biebererstrasse and Friedhofstrasse, where construction had to be carried out directly under the basement foundations, so that a tubular umbrella ceiling was required.

In 1992, HfG professor Adam Jankowski (Marktplatz station) and Städel professor Thomas Bayrle (Kaiserlei station) were engaged to design an artistic design, but the results were never realized.

Commissioning and subsequent changes

Offenbach Ost S-Bahn station

The line between Frankfurt Mühlberg and Offenbach Ost went into operation on May 23, 1995. Associated with this was the extension of the S8 to Hanau, while the S1 only ran to Offenbach Ost. The S2, which until then had its terminus at Mühlberg, now drove to the Frankfurt Südbahnhof .

After the completion of the expansion measures on the Rodgau Railway and the line to Dietzenbach, the S1, S2, S8 and S9 lines now run through the Offenbach City Tunnel. In contrast to the other lines, the S2 only ran every half hour until June 13, 2010, due to the lack of sufficient capacity of the Frankfurt City Tunnel, while the reinforcement trains of the S2 only ran between Dietzenbach and Offenbach Hbf or Frankfurt Hbf and Niedernhausen and therefore not the tunnel used.

In the course of the Offenbach City Tunnel, the S-Bahn runs to three stations: Kaiserlei , Leather Museum and Marktplatz . All stations are very similar in their construction and do not have any supports. At the same time, they are very clearly designed to meet the changed requirements due to the safety needs of passengers and the avoidance of graffiti spraying, the planning of the stations was not carried out by the railway itself, but by commissioned architects for the first time in the construction history of the Rhein-Main S-Bahn.

literature

  • Railways in the Frankfurt RheinMain region . Hestra-Verlag, Darmstadt 2002, ISBN 3-7771-0304-7 .

Web links

Commons : S-Bahn Offenbach and City-Tunnel  - album with pictures, videos and audio files