Coal triangle bridge

from Wikipedia, the free encyclopedia
Photo-request.svg
 Image wanted 
BW

The coal triangle bridge is a bridge structure ( trough bridge made of prestressed concrete ) built within the framework of the so-called Altstetten – Zurich HB – Oerlikon (DML) diameter line . The single-lane bridge, which was completed in 2015, is located in the forecourt of Zurich's main train station and crosses the coal triangle, which was used to store the coal during steam operation. Today the SBB coal triangle substation is located here . The bridge enables the level crossing of the Zurich HB – Thalwil route .

Together with the Letzigrabenbrücke , it forms the exit from the new, underground Löwenstrasse station to the west: the 394-meter-long coal triangle bridge connects to the exit from Löwenstrasse station and extends to the Hardbrücke . For the crossing under the Hardbrücke, the railway line runs at the level of the existing track systems. The Letzigrabenbrücke continues the route for westbound trains to Altstetten station and crosses the entire track field of the forecourt as well as the Duttweilerbrücke, a road bridge over the track field. Trains in the opposite direction can use existing tracks. The Kohlendreieckbrücke crosses the listed Hilfiker house with a minimal vertical distance. It was originally the aim of SBB to demolish the house built in 1952 by Hans Hilfiker . The monument protection was upheld because the building is considered to be "an important contemporary witness in terms of technology and railway history".

Construction work began in February 2010 with the construction of the ramp structure west, followed by a total of seven pillars in August of the same year . In contrast to the feed scaffold on the Letzigraben bridge, the bridge trough of the coal triangle bridge was built with conventional bridge formwork.

In November 2013, a serious construction flaw was discovered during a routine inspection: the concrete of the bridge trough showed fine cracks above the pillars. The reason for this lies in the structural detail that the bearings on which the bridge trough rests are slightly shifted inwards for aesthetic reasons: “The forces from above from the supporting structure and those from below do not meet at one point; the lateral difference causes a bending moment on the floor slab. Because this flow of forces has not been taken into account, this plate is dimensioned too weakly. It bends upwards ... ».

This static error was corrected without major changes to the external bridge and without time delays: "About each of the pillar 30 to be six to eight pretensioning cables of steel transversely drawn from the ground and fixed to the outside via anchor heads. Each cable is tensioned with 220 tons of tension. The wire ropes prevent the base plate from bending upwards. "

The tensioning cables resting on the bridge trough had to be concreted in, which meant that a conventional ballasted track could no longer be installed due to the lack of space . For this reason, for the first time in Switzerland, a slab track from the LVT system (as in the Weinberg tunnel ) was installed on longer bridges .

In 2014, the ramp structure east was finally built.

The construction costs of the Letzigraben and Kohlendreieck Bridge, which was officially opened on October 26, 2015 and started operating on December 13, 2015, totaled around CHF 300 million .

Web links

Individual evidence

  1. ↑ The monument covered in concrete. Tagesanzeiger.ch, accessed on August 24, 2016 .
  2. ↑ a b Peter Rahm: Zurich Diameter Line puts second stage into operation . In: Fachkom GmbH (Ed.): The construction sites . Issue 12. Fachkom GmbH, Langnau am Albis December 2015, p. 62-66 .
  3. ↑ a b c Ruedi Baumann: Too graceful to be stable. Tagesanzeiger.ch, August 28, 2014, accessed on November 4, 2016 .
  4. ↑ unknown: It will be expensive: SBB have to improve the bridge for the cross-city line in Zurich. watson.ch, April 10, 2014, accessed on November 4, 2016 .
  5. ↑ unknown: Swiss premiere for LVT on long bridges. Vigier Rail AG, September 15, 2015, accessed on November 4, 2016 .
  6. ↑ hub / zet / sda: Bye-bye dead end. Tagesanzeiger.ch, October 26, 2015, accessed on November 4, 2016 .
  7. ↑ Thomas Widmer: The quick-change artist. Tagesanzeiger.ch, October 26, 2015, accessed on November 4, 2016 .

Coordinates: 47 ° 22 ′ 54 "  N , 8 ° 31 ′ 15"  E ; CH1903:  six hundred eighty-one thousand seven hundred and thirty-one  /  248433