Unstruttal Bridge

from Wikipedia, the free encyclopedia

Coordinates: 51 ° 17 ′ 1 "  N , 11 ° 38 ′ 26"  E

Unstruttal Bridge
Unstruttal Bridge
Convicted
High- speed route Erfurt – Leipzig / Halle
Subjugated Unstrut , Dissau, Naumburg – Reinsdorf railway line
construction Frame bridge
overall length 2668 m
width 13.95 m (regular size)
Longest span 108 m
Construction height 4.75 m
height 49 m
start of building 2007
completion 2012
location
Unstruttal Bridge (Saxony-Anhalt)
Unstruttal Bridge

The Unstruttal Bridge is a double-track railway overpass on the new Erfurt – Leipzig / Halle line . With a length of 2668 m, it is the second longest railway bridge in Germany after the Saale-Elster valley bridge . The structure consists of a chain of four 580 m long joint and bearingless frame bridges made of prestressed concrete , a form of construction that was first used in Germany for a prestressed concrete railway bridge.

Unstruttal Bridge, aerial view (2018)

course

The structure is located between kilometers 246.0 and 248.7 of the new line and spans the Unstrut valley north of the municipality of Karsdorf around 25 km southwest of Halle (Saale) at a height of up to 49 m. In addition to the Unstrut the (temporary water-bearing) Dissau, two are state roads , rural roads and the Unstrut railway crossing. The valley is characterized on its east side by steep limestone slopes , on its west side its flank is flat. The Bibra tunnel follows to the west of the bridge , and the Osterberg tunnel to the east .

history

planning

The planning from mid-1993 envisaged a structure around three kilometers long and up to 70 m high with spans of 58 m or 116 m, the route of which was to be curved to the right in a northerly direction. The pillars should taper from 4.5 × 6.5 m at the bottom to 3.0 × 5.0 m at their top.

The planning update in 1994 resulted in a structure length of around 3.2 km with a height reduced to a maximum of 60 m and unchanged standard support widths of 58 m as well as several A-frames each with a span of 116 m. In mid-1994 the building was calculated at 125 million D-Marks net. According to the planning status from mid-1995, the 2668 m long structure should be located in the planning approval section 2.2 of the new line, between construction kilometers 54.96 and 57.63. To the south of the bridge, before the transition to the Bibra tunnel, the Nebra transfer point was to be set up at kilometer 54.42 .

In 1996 the planning approval decision for the section of the Unstruttal bridge was issued. In 2006 the bridge design was revised.

construction

Construction sign: planned completion January 2011

Archaeological excavations in the area of ​​the future bridge were carried out in several phases between 1994 and November 2007 . Around 300 finds were identified, including eleven stool graves from the Cord Ceramic Period (approx. 2000 BC). The excavations were preceded by an evaluation of aerial photographs, which suggested archaeological finds. For a time, an excavation manager and up to 15 helpers were busy uncovering the pieces. The finds from the Bronze and Stone Ages , some of which are only a few centimeters below the surface, are to be transferred to the holdings of the State Office for Monument Preservation and Archeology in Halle.

In February 2006, construction site clearing began in the area of ​​the future bridge. Among other things, 13.5 km of high-voltage lines worth around 12 million euros were laid. In the same year, accompanying landscape conservation measures should begin (as of April 2006).

The construction project was put out to tender at the beginning of January 2007. The construction contract was awarded at the beginning of July 2007 with a net contract volume of 50 million euros. The construction costs should amount to 55 million euros net.

Construction of the construction site began in the same month. The first piles were drilled in November 2007. The accompanying landscape conservation measures are to be completed in 2013. According to the construction sign, the end of the construction work was scheduled for January 2011. This goal was later postponed to the end of July 2012.

The construction sites were reached via a network of construction roads , which were largely dismantled after the construction work was completed. The eastern approach to the construction site was retained as an escape route to the western portal of the Osterberg tunnel.

In the course of the construction work, the Dissau and five farm roads were relocated. No fortifications were built on the river.

As ecological compensatory measures, measures worth 7.3 million euros were planned over an area of ​​400 hectares . Among other things, arable land was renatured, trees were planted and orchards were created. A new arm of the Unstrut was also built.

Bridge construction with telescopic armor, 2009

The bridge was built from west to east. For the construction of the superstructure, a 770 t heavy feed scaffolding was used, the shifting consoles of which were attached to the pillars and arches. It consisted of two box girders with a length of about 71 m and was 128 m long with the trailer and the front stem nose . In advance, the four arches were built in twelve construction phases with the help of a ground-supported shoring . Since the superstructure cross-section is wider in the arch area and has vertical webs, it was created with the arch. The formwork scaffolding on the advancing scaffolding always had to be dismantled when crossing this section.

In order to build the arch over the Unstrut, it was closed to shipping in 2010. Entry and exit points with a transfer option for water hikers had been set up.

Slab track with additional lateral guidance

In July 2012, the symbolic closing of the gap and the completion of the structural work could be celebrated. The track system was installed on the bridge in 2013.

At the end of August 2014, two special freight trains with a meter load of eight tonnes were driven over the bridge in order to test the calculated static behavior of the structure in practice.

construction

Finished arch

The prestressed concrete superstructure has a box-girder cross-section with a construction height of 4.75 m and a deck slab width of 13.95 m, which increases to 15.93 m in the widening area in front of the Osterberg tunnel. It consists of 46 fields with 58 m span each and is divided into six continuous beam sections. The two 174 m long end segments in front of the abutments have three openings, each 58 m apart. The four sections in between each have an arch in the middle with a span of 108 m and are planned as 580 m long frame bridges with no joints or bearings - also known as integral bridges. The arch has the shape of a truss , is 7.0 m wide at the top and about 5 m thick, and is monolithically connected to the superstructure . In the transverse direction it splits and spreads and has a total width of 13.5 m at the bottom with a thickness of 2.0 m. The arch is founded together with a pillar on a pile head foundation. The pillars next to the arches have a center distance of 116 m. On both sides there are four fields each 58 m long. The abutments and arches derive the horizontal forces from brakes. Accordingly, there are expansion joints with rail extensions and compensation plates on the five dividing pillars .

The dividing pillars are slotted from the head of the pillar in the direction of the pillar base over a length of 25 m and consist of two 0.6 m wide panes at the head to accommodate changes in shape from the longitudinal expansion of the superstructure of up to 375 mm.

Dividing pillars

The foundation of the abutments, pillars and arches consists of pile head plates, which are supported by piles that extend into the depth of the red sandstone , with a total length of 7,500 m. Each of the eight arched feet stands on a 1250 m³ pile head plate and 21 bored piles with a diameter of 1.8 m and lengths of 8 m to 26 m. In the tender, 10 piles were planned. The pillars were founded on six piles with a diameter of 1.5 m and lengths of 8 to 40 m and the abutments on twelve piles, each 20 m long and 1.5 m in diameter.

The superstructure is generally monolithically connected to the pillars and arches. From this it follows on the one hand that an interchangeability of the superstructure, as previously provided for on the new lines, is no longer possible; on the other hand, there are no bearings on all pillars and the pillars can be made particularly slim. The standard pillars are only 1.5 m wide, the main pillars 2.0 m and the dividing pillars 2.5 m wide. In the case of the usual bridge structures on the new lines, due to the space required for the bearings, the inner pillars of continuous girder bridges are 2.7 m and the separating pillars 4.0 m. In bridge transverse direction, the top 5.0 m wide pillars of Unstruttalbrücke have a suit of 40 to 1 in the direction of Pfeilerfußpunktes.

The slab track on the bridge was originally intended to be equipped with sound-absorbing elements throughout. On the south side there is a 2200 m long and 2.5 m high noise protection wall and on the north side there is a 2400 m long and 1.0 m high wind protection wall.

gallery

  • Pile head reinforcement
    (September 2008)

  • State of bow construction
    (June 2009)

  • Construction status
    (November 2009)

  • Pile head foundation of the arch
    (November 2009)

  • State of bow construction over the Unstrut
    (September 2010)

literature

  • Deutsche Bahn AG, Communication / DB ProjektBau GmbH, Regional Area Southeast (publisher): New Erfurt – Leipzig / Halle line: Unstruttal bridge railway overpass , information sheet (two pages), November 2007.
  • Thomas Rimane: The construction of the railway overpass Unstruttalbrücke. In: Bauportal , Issue 5, Volume 124, May 2012, ISSN  1866-0207 , pp. 2–7.

Web links

Commons : Unstruttalbrücke  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d e Deutsche Bahn AG, Communication / DB ProjektBau GmbH, Regional Area Southeast (publisher): New Erfurt – Leipzig / Halle line: Unstruttal bridge railway overpass , information sheet (two pages). Status: November 2007
  2. ^ Planungsgesellschaft Bahnbau Deutsche Einheit mbH: Bahn plans the future. New line Erfurt - Leipzig / Halle: over the Unstruttal . Six-page fanfold dated July 1993.
  3. ^ Thomas Schubert, Frank Kniestedt: First course set: new railway line Erfurt-Leipzig / Halle . In: Baukultur , Heft 3, 1994, pp. 20-24, ISSN  0722-3099
  4. ^ Planungsgesellschaft Bahnbau Deutsche Einheit (Ed.): Transport project German Unity Rail No. 8: ABS / NBS Nürnberg-Erfurt-HalleLeipzigBerlin: Section Erfurt - Leipzig / Halle: Planning status June 1994 . Brochure, Leipzig, 1994.
  5. ^ Planungsgesellschaft Bahnbau Deutsche Einheit , Projektzentrum Leipzig (Ed.): Transport project German Unity - Rail No. 8: ABS / NBS Nuremberg - Erfurt - Halle / Leipzig - Berlin: Section Erfurt - Leipzig / Halle: Figures and facts . 20-page brochure, Leipzig, August 1995, p. 8 f.
  6. ↑ a b Future bridge on historical ground . In: DB Welt , February 2008 edition, p. 11.
  7. ↑ Germany's longest construction site . In: mobile . April 2010, pp. 50-54.
  8. ↑ Stone Age finds when building bridges . In: mobile . Edition February 2008, p. 56
  9. ^ Deutsche Bahn AG: Securing archaeological finds before the construction of the Unstruttal bridge in the Burgenland district in Saxony-Anhalt . Press release from November 23, 2007
  10. ↑ Alpine builds ICE bridge in Germany . In: Die Presse.com of July 4, 2007
  11. ↑ a b c d Krebs und Kiefer: Railway overpass Unstruttalbrücke, new line Erfurt - Leipzig / Halle ( Memento of November 4, 2013 in the Internet Archive ) (PDF; 352 kB)
  12. ↑ a b Olaf Drescher : The VDE8 project . ( Memento from December 19, 2013 in the Internet Archive ) (PDF) Lecture January 19, 2012 at TU Cottbus, slide 15 (PDF; 13.0 MB)
  13. ↑ Sheep in the service of the railway . ( Memento from February 11, 2013 in the web archive archive.today ) In: Mitteldeutsche Zeitung (online edition), July 6, 2009
  14. ↑ a b Thomas Rimane: The construction of the railway bridge Unstruttalbrücke . In: Bauportal , issue 5, volume 124, May 2012
  15. ↑ Building a bridge over the Unstruttal with the second longest railway bridge in Germany in Saxony-Anhalt. vde8.de, July 6, 2012, accessed on November 2, 2013 .
  16. ↑ Holger Behrens: 2000 tons roll over rails . In: Mitteldeutsche Zeitung . August 29, 2014, p. 10 ( online ).