Lahntalbrücke (NBS Cologne-Rhein / Main)
Coordinates: 50 ° 23 ′ 25 ″ N , 8 ° 5 ′ 15 ″ E
| Lahn valley bridge | ||
|---|---|---|
 |
||
| Convicted | High-speed route Cologne – Rhine / Main | |
| Crossing of | Lahn | |
| place | Limburg | |
| construction |
Arch bridge prestressed concrete - box girder bridge |
|
| overall length | 437.85 m | |
| width | 13.78 m | |
| Longest span | 116 m | |
| Construction height | 4.75 m | |
| height | 50 m | |
| building-costs | 25 million DM (today's purchasing power approx. 32.3 million EUR) |
|
| start of building | 1998 | |
| completion | 2001 | |
| opening | August 1, 2002 | |
| location | ||
|
||
The Lahntalbrücke is a 438 m long double-track railway overpass on the high-speed Cologne – Rhine / Main line .
The only arch bridge on the route is in Limburg an der Lahn at route kilometer 107. It spans the Lahn with the parallel Lahntalbahn and, south of the arch, the country road 3020 (Eschhöfer Weg), at a maximum height of 50 m above ground.
Location and course
After a 750 m long dam, the structure connects to Limburg (South) train station.
The route is initially straight in the direction of Cologne. In the area of the second field a transition arch begins , which builds up an arc of 3500 m radius up to the northern abutment. This left curve continues in the subsequent Limburg tunnel .
The gradient of the structure drops to the north at 28 per thousand.
Immediately to the north of the structure is the Limburg tunnel. A few hundred meters down the Lahn runs the almost parallel Lahntal Bridge Limburg of the BAB 3 .
The structure spans, from north to south, a long-distance cycle path, the Lahn, the Lahntalbahn and the Limburg – Eschhofen road.
history
planning
At the end of 1995 the planned length of the structure was 432 m. At the end of 1997, 430 m were planned. In mid-1999, the length of the structure was planned, as was later realized, 438 m.
Due to the proximity to the historic old town of Limburg and the existing motorway bridge, there was an in-depth discussion of the bridge design. The variant chosen, which spans the Lahn with a 116 m wide arch, avoided structural interventions on the river. Numerous other variants for the design of the bridge were discarded. The original design provided for a pillar in the river bed of the Lahn. Another, unrealized alternative design called for a slim bridge with V-shaped supports.
construction
The bridge was built between 1998 and 2001 at a cost of around 25 million DM.
Due to the cramped subsoil conditions on the south bank of the Lahn, state road 3020 was swiveled during construction and secured by means of a bored pile wall.
In April 2000 the arch was closed. Then the construction of the superstructure began. With the completion of the superstructure in September 2000, the alignment of the new line was completed.
Foundation and substructures
With the exception of the northern abutment , all piers have a deep foundation with pile head foundations and bored piles 1.5 m in diameter. The pile lengths are between 5.5 m and 22 m. The abutment in front of the Limburg tunnel is based on two shafts inclined at 5: 1 against each other with an inner diameter of 8.4 m and a depth of 38 m due to the unfavorable subsoil conditions.
In the middle of the bridge, the superstructure is demolished by a reinforced concrete arch with a span of 116 m, which corresponds to twice the span of the standard fields. The arch has the shape of a parabola and a box-girder cross-section. The construction height at the transom foundations is 4.0 m and decreases to 3.5 m towards the apex. The associated width is reduced from 7.33 m to 6.3 m.
The rectangular reinforced concrete pillars with a maximum height of 40 m have a hollow box cross-section. They taper upwards with a 70: 1 suit.
Profiling, tightening and beveling of the corners of the arch correspond to those of the pillars.
superstructure
The superstructure consists of a 437.85 m long continuous beam with eight fields. The cross-sectional shape is a single-cell prestressed concrete box with inclined webs. In addition to the longitudinal direction, the deck slab is also prestressed in the transverse direction . With a deck width of 12.98 m, the spans are 33.00 m + 6x58.00 m + 56.85 m. The construction height is a constant 4.75 m (1/12 of the span).
Despite the unfavorable subsurface conditions, the fixed point of the bridge was placed in the northern abutment, as a rail extension could not have been arranged without reducing the maximum permissible speed (due to the lower permissible cant) due to the narrow curve (3,500 m radius, 170 mm cant ).
execution
The arch was produced using a cantilever with 12 or 13 sections with cycle lengths of 1.94 m to 5.0 m. The arch was held with auxiliary guy lines, which were anchored to the adjacent pillar foundations via auxiliary pylons on the abutment pillars. During production, all structural deformations were monitored with the help of an extensive measuring program.
The superstructure was concreted field by field with an advancing scaffold.
Lahntalbrücke, view from the L3020
Lahntalbrücke, looking north
Arch of the Lahntal Bridge, looking south
Lahntalbrücke, looking west with BAB 3 bridge in the background
See also
literature
- Philipp Holzmann AG: Lahntal Bridge . Company prospectus.
- Construction of the Lahntal bridge as part of the new DB line Cologne – Rhine / Main . In: Tiefbau , 2001, issue 12, pp. 810–814 (PDF file)
Web links
Individual evidence
- ↑ 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.
- ↑ a b c d e f g h i j In a wide arc over the Lahn . In: On the subject , ZDB -ID 2115698-0 , edition 5/2000, October 2000, pp. 9-11.
- ↑ a b c Deutsche Bahn AG (Ed.): Seven fairy-tale stories about the new DB line Cologne – Rhine / Main . Brochure, 36 pages, Berlin, no year (approx. 2002), p. 21.
- ^ 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.
- ↑ DBProjekt GmbH Cologne – Rhein / Main (Ed.): Route map: New Cologne-Rhein / Main line , Frankfurt am Main, November 1997.
- ↑ DBProjekt GmbH Cologne – Rhine / Main: New Cologne-Rhine / Main line: route map , Frankfurt, June 1999.
- ↑ G. Blaasch: The new line between Cologne and Frankfurt . In: Tiefbau , 2000, issue 7, pp. 396–406.
- ^ Andreas Molitor: Operation megalomania . In: Die Zeit , No. 31, 2001.
- ↑ DB Netze (Ed.): Guide to designing railway bridges . 1st edition 2008, p. 14 f.
- ↑ Cologne / Bonn Airport; Mouse guest; Successful completion of the bow; Limburg ICE train station; Idstein tunnel . In: On the subject , ZDB -ID 2115698-0 , edition 3/2000, June 2000, pp. 7-9.
- ↑ Greetings . In: On the subject , ZDB -ID 2115698-0 , edition 6/2000, December 2000, p. 3.