fbpx
Wikipedia

Salginatobel Bridge

Salginatobel Bridge is a reinforced concrete arch bridge designed by Swiss civil engineer Robert Maillart. It was constructed across an alpine ravine in the grisonian Prättigau, belonging to the municipality of Schiers, in Switzerland between 1929 and 1930. In 1991, it was declared an International Historic Civil Engineering Landmark, the thirteenth such structure and the first concrete bridge so designated.[3]

Salginatobel Bridge
Southeast view, from an angle
Coordinates46°58′54.55″N 9°43′3.81″E / 46.9818194°N 9.7177250°E / 46.9818194; 9.7177250
CrossesSalgina Ravine[1]
LocaleSchiers, Switzerland[1]
Characteristics
Designthree-hinged reinforced concrete hollow box girder arch bridge[1]
MaterialReinforced concrete
Total length133 metres (436 ft)
Width3.5 metres (11 ft)
Height90 metres (300 ft)
Longest span90 metres (300 ft)[1]
No. of spans1
Load limit8000kg
History
DesignerRobert Maillart[1]
Construction start1929
Construction end1930[1]
Construction cost180,000 CHF[2]
Opened1930-08-13
Location

As with his Schwandbach Bridge and Vessy Bridge, the structure's fame among civil engineers is a consequence of the techniques involved and the elegance of its design rather than its prominent location: it connects the village Schiers – on valley floor of the route between Landquart and Davos – with the alpine hamlet Schuders of almost 100 people, where the alpine post road ends, but is often visited by designers.[4]

Design and history edit

Maillart had previously designed a three-hinged arch bridge over the Rhine at Tavanasa in 1904. In the 51 metres (167 ft) span Tavanasa bridge, the arch is thinnest at its crown and springing points, thickening in between to reflect the shape of its bending moment diagram.[5] This bridge was destroyed by an avalanche in September 1927. Although Maillart didn't win the contract for a replacement bridge, he entered a competition the following year for the bridge at Salginatobel, with a three-hinged arch spanning 90 metres (300 ft) that used the same overall form as at Tavanasa. In conjunction with contractor Florian Prader, Maillart's design was the least expensive of nineteen entries.[6]

The Salginatobel bridge arch is 133 metres (436 ft) long in total, and its main element is a hollow concrete box girder over the central part of the arch.[7] It carries a roadway 3.5 metres (11 ft) wide, supported on reinforced concrete pillars above the ends of the arches.[7]

The falsework was built by the Graubünden carpenter Richard Coray in late summer 1929, and the rest of the construction started in 1930. The bridge was officially opened on 18 August 1930.[8]

Although regarded as a pioneering work, several aspects of its construction lacked durability, such as the absence of bridge deck waterproofing, low concrete cover and poor drainage. In 1975 and 1976 it was extensively repaired, the parapets were modified, and waterproofing was added.[9] However, by 1991, deterioration had continued, with the parapets becoming unsafe. The waterproofing and drainage were replaced and amended, and most of the existing concrete surface removed and replaced by shotcrete.[9] The parapets were completely rebuilt. Completed in 1998, this repair work cost 1.3 million US dollars.[9]

Praise and criticism edit

The bridge has received widespread attention since its innovative design and construction, including considerable praise from other bridge engineers, architects and architectural historians. Writing in 2000, Heinrich Figi said:[7]

From a conceptual point of view, the Salginatobel Bridge is an excellent structure.

David P. Billington has been particularly enthusiastic about the bridge:[8]

Its visual elegance ... goes together with its technical brilliance.

Such works at Maillart's, being at the very highest level of engineering achievement and being works of art, must be protected.

The German bridge engineer Fritz Leonhardt has suggested that:[13]

These Maillart-type arch bridges only look good in special situations as here over a gorge and against a mountainous background.

Maillart was not entirely satisfied with the bridge, writing after its completion that its soffit should have been a pointed rather than a pure curved arch, if it were properly to match his structural analysis:[14]

Even the [Salginatobel Bridge] cannot lay claim to complete sincerity of form. Indeed, if both constant and shifting weights are taken into consideration, the extreme curves of exerted pressures form two lenticular surfaces whose lower contours meet at an acute angle.

Image gallery edit

References edit

  • Billington, David P. Maillart and the Salginatobel Bridge. Structural Engineering International, 1/1991.
  • Billington, David P. The Tower and the Bridge. Princeton University Press, Princeton, USA, 1983. ISBN 0-691-02393-X
  • Billington, David P. Robert Maillart and the Art of Reinforced Concrete. The MIT Press. Cambridge, USA, 1990. ISBN 0-262-02310-5.
  • Billington, David P. The Art of Structural Design: A Swiss Legacy. Princeton University Art Museum. Princeton, USA, 2003. ISBN 0-300-09786-7.
  • Figi, Heinrich. Rehabilitation of the Salginatobel Bridge. Structural Engineering International, 1/2000.
  • Leonhardt, Fritz. Bridges: Aesthetics and Design. The MIT Press, Cambridge, USA, 1984. ISBN 0-262-12105-0
  • Maillart, Robert. Construction and Aesthetic of Bridges. The Concrete Way, May–June 1935.

Notes edit

  1. ^ a b c d e f Salginatobel Bridge at Structurae
  2. ^ "World Monument Salginatobel Bridge - International Historic Civil Engineering Landmark" (PDF). Retrieved 2 August 2014.
  3. ^ Billington, 2003, p.60
  4. ^ "Die Erschliessung von Schuders" (in German). Fajauna, Switzerland: Verein Salginatobelbrücke. 2021.
  5. ^ Billington, 1990, p. 12
  6. ^ Billington, 1983, p.160
  7. ^ a b c Figi, p.21
  8. ^ a b Billington, 1991, p.46
  9. ^ a b c Figi, p.22
  10. ^ Siegfried Giedion, Space, Time and Architecture: the growth of a new tradition, Cambridge, Massachusetts: Harvard University Press, 1967
  11. ^ "#353, Robert Maillart, Engineer, June 24 - October 13, 1947", Exhibit History, Museum of Modern Art, accessed 2 Nov 2010
  12. ^ Swiss inventory of cultural property of national and regional significance 2009-05-01 at the Wayback Machine 21.11.2008 version, (in German) accessed 30-Oct-2009
  13. ^ Leonhardt, p.217
  14. ^ Maillart, pp. 303-4, cited in Billington, 2003, p. 60

External links edit

  • Salginatobel Bridge at archINFORM (includes construction photo)
  • ASCE: Salginatobel Bridge
  • Great Buildings Online
  • Sightseeing Graubünden, Switzerland, official tourism board suggestions and location

salginatobel, bridge, reinforced, concrete, arch, bridge, designed, swiss, civil, engineer, robert, maillart, constructed, across, alpine, ravine, grisonian, prättigau, belonging, municipality, schiers, switzerland, between, 1929, 1930, 1991, declared, interna. Salginatobel Bridge is a reinforced concrete arch bridge designed by Swiss civil engineer Robert Maillart It was constructed across an alpine ravine in the grisonian Prattigau belonging to the municipality of Schiers in Switzerland between 1929 and 1930 In 1991 it was declared an International Historic Civil Engineering Landmark the thirteenth such structure and the first concrete bridge so designated 3 Salginatobel BridgeSoutheast view from an angleCoordinates46 58 54 55 N 9 43 3 81 E 46 9818194 N 9 7177250 E 46 9818194 9 7177250CrossesSalgina Ravine 1 LocaleSchiers Switzerland 1 CharacteristicsDesignthree hinged reinforced concrete hollow box girder arch bridge 1 MaterialReinforced concreteTotal length133 metres 436 ft Width3 5 metres 11 ft Height90 metres 300 ft Longest span90 metres 300 ft 1 No of spans1Load limit8000kgHistoryDesignerRobert Maillart 1 Construction start1929Construction end1930 1 Construction cost180 000 CHF 2 Opened1930 08 13Location As with his Schwandbach Bridge and Vessy Bridge the structure s fame among civil engineers is a consequence of the techniques involved and the elegance of its design rather than its prominent location it connects the village Schiers on valley floor of the route between Landquart and Davos with the alpine hamlet Schuders of almost 100 people where the alpine post road ends but is often visited by designers 4 Contents 1 Design and history 2 Praise and criticism 3 Image gallery 4 References 5 Notes 6 External linksDesign and history editMaillart had previously designed a three hinged arch bridge over the Rhine at Tavanasa in 1904 In the 51 metres 167 ft span Tavanasa bridge the arch is thinnest at its crown and springing points thickening in between to reflect the shape of its bending moment diagram 5 This bridge was destroyed by an avalanche in September 1927 Although Maillart didn t win the contract for a replacement bridge he entered a competition the following year for the bridge at Salginatobel with a three hinged arch spanning 90 metres 300 ft that used the same overall form as at Tavanasa In conjunction with contractor Florian Prader Maillart s design was the least expensive of nineteen entries 6 The Salginatobel bridge arch is 133 metres 436 ft long in total and its main element is a hollow concrete box girder over the central part of the arch 7 It carries a roadway 3 5 metres 11 ft wide supported on reinforced concrete pillars above the ends of the arches 7 The falsework was built by the Graubunden carpenter Richard Coray in late summer 1929 and the rest of the construction started in 1930 The bridge was officially opened on 18 August 1930 8 Although regarded as a pioneering work several aspects of its construction lacked durability such as the absence of bridge deck waterproofing low concrete cover and poor drainage In 1975 and 1976 it was extensively repaired the parapets were modified and waterproofing was added 9 However by 1991 deterioration had continued with the parapets becoming unsafe The waterproofing and drainage were replaced and amended and most of the existing concrete surface removed and replaced by shotcrete 9 The parapets were completely rebuilt Completed in 1998 this repair work cost 1 3 million US dollars 9 Praise and criticism edit1947 the bridge was featured with other of Maillart s works in a four month exhibit at the Museum of Modern Art New York 10 11 Salginatobel Bridge was designated a Swiss heritage site of national significance 12 1991 it was designated an International Historic Civil Engineering Landmark by the American Society of Civil Engineers The bridge has received widespread attention since its innovative design and construction including considerable praise from other bridge engineers architects and architectural historians Writing in 2000 Heinrich Figi said 7 From a conceptual point of view the Salginatobel Bridge is an excellent structure David P Billington has been particularly enthusiastic about the bridge 8 Its visual elegance goes together with its technical brilliance Such works at Maillart s being at the very highest level of engineering achievement and being works of art must be protected The German bridge engineer Fritz Leonhardt has suggested that 13 These Maillart type arch bridges only look good in special situations as here over a gorge and against a mountainous background Maillart was not entirely satisfied with the bridge writing after its completion that its soffit should have been a pointed rather than a pure curved arch if it were properly to match his structural analysis 14 Even the Salginatobel Bridge cannot lay claim to complete sincerity of form Indeed if both constant and shifting weights are taken into consideration the extreme curves of exerted pressures form two lenticular surfaces whose lower contours meet at an acute angle Image gallery edit nbsp Southeast view nbsp Hollow concrete box girder nbsp The arch nbsp References editASCE page on the bridge Billington David P Maillart and the Salginatobel Bridge Structural Engineering International 1 1991 Billington David P The Tower and the Bridge Princeton University Press Princeton USA 1983 ISBN 0 691 02393 X Billington David P Robert Maillart and the Art of Reinforced Concrete The MIT Press Cambridge USA 1990 ISBN 0 262 02310 5 Billington David P The Art of Structural Design A Swiss Legacy Princeton University Art Museum Princeton USA 2003 ISBN 0 300 09786 7 Figi Heinrich Rehabilitation of the Salginatobel Bridge Structural Engineering International 1 2000 Leonhardt Fritz Bridges Aesthetics and Design The MIT Press Cambridge USA 1984 ISBN 0 262 12105 0 Maillart Robert Construction and Aesthetic of Bridges The Concrete Way May June 1935 Notes edit a b c d e f Salginatobel Bridge at Structurae World Monument Salginatobel Bridge International Historic Civil Engineering Landmark PDF Retrieved 2 August 2014 Billington 2003 p 60 Die Erschliessung von Schuders in German Fajauna Switzerland Verein Salginatobelbrucke 2021 Billington 1990 p 12 Billington 1983 p 160 a b c Figi p 21 a b Billington 1991 p 46 a b c Figi p 22 Siegfried Giedion Space Time and Architecture the growth of a new tradition Cambridge Massachusetts Harvard University Press 1967 353 Robert Maillart Engineer June 24 October 13 1947 Exhibit History Museum of Modern Art accessed 2 Nov 2010 Swiss inventory of cultural property of national and regional significance Archived 2009 05 01 at the Wayback Machine 21 11 2008 version in German accessed 30 Oct 2009 Leonhardt p 217 Maillart pp 303 4 cited in Billington 2003 p 60External links edit nbsp Wikimedia Commons has media related to Salginatobelbrucke Salginatobel Bridge at archINFORM includes construction photo ASCE Salginatobel Bridge Great Buildings Online Sightseeing Graubunden Switzerland official tourism board suggestions and location Retrieved from https en wikipedia org w index php title Salginatobel Bridge amp oldid 1141318978, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.