A spiral bridge, loop bridge, helix bridge, or pigtail bridge is a road bridge which loops over its own road, allowing the road to climb rapidly. This is useful in steep terrain, or where the approach road to a bridge would terminate too far from the bridge's end. The shape of the bridge forms a helix, not a spiral.
In the Black Hills of South Dakota, a particular form of spiral bridge, locally called a 'pigtail bridge', was introduced in 1932 by Cecil Clyde Gideon, the self-taught superintendent of Custer State Park turned highway designer. He called them “spiral-jumpoffs”. During the planning for Iron Mountain Road, there was a need to negotiate sudden elevation drops while preserving natural features for this scenic highway; the corkscrew design allowed for a spectacular—albeit expensive—solution to this problem. In order to blend the bridges with their surroundings, natural materials such as local timber were used.
The bridge over the mainline and narrow-gauge railways just west of Wernigerode Hauptbahnhof station in the Harz, Germany has a spiral at each end
Spiral pedestrian bridges
1998–2004, Glass Spiral Bridge, Millennium Place, Coventry, England
Turnover bridges
Turnover bridges were a feature of some early British canals such as the Macclesfield. The boats were pulled by a horse, and in locations where the towpath crossed to the opposite bank, the spiral on one side allowed the horse to continue without detaching the tow rope. They were not universally provided as they were more expensive to build, needing to span both the canal and the towpath.
Missouri River Bridges of South Dakota, 1920 to 1980, interview of Kenneth R. Scurr, Former South Dakota Bridge Engineer, by Emory Johnson, South Dakota State University
March 19, 2023
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A spiral bridge loop bridge helix bridge or pigtail bridge is a road bridge which loops over its own road allowing the road to climb rapidly This is useful in steep terrain or where the approach road to a bridge would terminate too far from the bridge s end The shape of the bridge forms a helix not a spiral Hastings Spiral Bridge 1895 Many multi storey car parks feature such a design as this Spiral ramp to Nanpu Bridge in Shanghai China Contents 1 Pigtail bridge 2 List of spiral road bridges 3 Spiral bicycle bridges 4 Spiral pedestrian bridges 5 Turnover bridges 6 See also 7 References 8 Further readingPigtail bridge Edit A pigtail bridge on Iron Mountain Road In the Black Hills of South Dakota a particular form of spiral bridge locally called a pigtail bridge was introduced in 1932 by Cecil Clyde Gideon the self taught superintendent of Custer State Park turned highway designer He called them spiral jumpoffs During the planning for Iron Mountain Road there was a need to negotiate sudden elevation drops while preserving natural features for this scenic highway the corkscrew design allowed for a spectacular albeit expensive solution to this problem In order to blend the bridges with their surroundings natural materials such as local timber were used Most pigtail bridges were built by the Civilian Conservation Corps in the 1930s List of spiral road bridges EditThis list is incomplete you can help by adding missing items July 2021 Name Location Year CommentA 7000 previously C 345 Malaga Colmenar road Spain 2 spiral tunnels at 36 46 33 N 4 22 46 W 36 775796 N 4 379339 W 36 775796 4 379339A6 Highway Italy 44 19 13 N 8 22 38 E 44 320409 N 8 377118 E 44 320409 8 377118Antirio to Lamia highway E65 Greece on the climb of Mount Parnassos to Delphi Greece 270 spiral using an overpass Astoria Megler Bridge south approach U S Route 101 Astoria Oregon United States 46 11 15 N 123 51 12 W 46 187590 N 123 853260 W 46 187590 123 853260Cahill Expressway Sydney New South Wales Australia Spiral turns left in order to turn right Caiyuanba Bridge South Approach Chongqing China 29 32 10 N 106 33 05 E 29 5360605 N 106 551513 E 29 5360605 106 551513Canal Road Flyover Victoria City Hong Kong 22 16 54 N 114 10 48 E 22 2816003 N 114 1800447 E 22 2816003 114 1800447Corkscrew Bridge Old East Entrance Road Yellowstone National Park abandoned 1 Wyoming United States 1904 1919 44 27 36 N 110 07 03 W 44 460000 N 110 117500 W 44 460000 110 117500Eastern Harbour Crossing Victoria City Hong Kong 22 17 19 N 114 12 46 E 22 2886114 N 114 2126683 E 22 2886114 114 2126683G329 South Bridge Approach Shaoxing China 30 01 19 N 120 43 51 E 30 0218999 N 120 7308062 E 30 0218999 120 7308062G4011 Runyang Yangtze River Bridge Shiye Exit Zhenjiang China 32 13 12 N 119 22 06 E 32 2201231 N 119 3682047 E 32 2201231 119 3682047General Artigas Bridge Uruguay and Argentina From Colon Entre Rios Argentina to Paysandu Paysandu Department Uruguay across the Uruguay river Cantilever bridge with a spiral on the Uruguay side Huanggang Port Approach Shenzhen ChinaIsenfluh Bern SwitzerlandJialing Jiahua Bridge Approach Chongqing China 29 33 38 N 106 31 03 E 29 5606004 N 106 5174331 E 29 5606004 106 5174331Jinchang Road Bridge Wuxi China Double loop bridge on each approach 31 33 24 N 120 19 51 E 31 556633 N 120 330889 E 31 556633 120 330889Kawazu Nanadaru Loop Bridge Kawazu Japan 1981 Double loop bridge 34 47 28 N 138 56 17 E 34 791 N 138 938 E 34 791 138 938Lincoln Tunnel approach road to west portal New Jersey Route 495 Weehawken New Jersey United States Known locally as The Helix 40 46 01 N 74 01 17 W 40 767037 N 74 021383 W 40 767037 74 021383Mizukami Loop Bridge Mizukami Kumamoto Japan 32 18 54 N 131 00 36 E 32 315 N 131 01 E 32 315 131 01N8 Bypass Brienzwiler Switzerland 46 45 02 N 8 06 32 E 46 750521 N 8 108833 E 46 750521 8 108833Nanpu Bridge Puxi Approach Puxi Shanghai China 2004Nansha Bridge Hai ou Exit Guangzhou China Interchange made of ramps from spiraling up to the Nansha Bridge 22 53 21 N 113 32 36 E 22 889226 N 113 543465 E 22 889226 113 543465New Clear Water Bay Road New Kowloon Hong Kong 22 19 54 N 114 13 29 E 22 331717 N 114 224617 E 22 331717 114 224617Prefectural Road 53 Onawaba Bridge east approach ja Gifu Japan 35 25 24 N 136 44 41 E 35 423410 N 136 744817 E 35 423410 136 744817Rongqiao Road Spiral Bridge Chongqing China Triple Loop Bridge 29 31 35 N 106 32 42 E 29 5262731 N 106 5449174 E 29 5262731 106 5449174Route de Cilaos Reunion 21 10 52 S 55 27 17 E 21 181180 S 55 454704 E 21 181180 55 454704S232 Bridge South Approach Changzhou China 31 42 57 N 120 04 05 E 31 715834 N 120 068168 E 31 715834 120 068168Sa Calobra Majorca Spain 39 49 55 N 2 48 57 E 39 831968 N 2 81574 E 39 831968 2 81574Sembon Matsu Bridge Approaches Osaka Japan Double loop bridge on each approach 34 37 57 N 135 28 33 E 34 6324803 N 135 4759645 E 34 6324803 135 4759645Shinkizugawao Bridge North Approach Osaka Japan 34 37 43 N 135 27 45 E 34 62866 N 135 4623977 E 34 62866 135 4623977South Dakota Highway 87 in Wind Cave National Park 2 South Dakota United States 1930s 43 36 04 N 103 29 40 W 43 601215 N 103 494340 W 43 601215 103 494340SP99 just north of Bolzano Italy Named Schneckentunnel German for snail tunnelSteinmen Crossing on Oregon Highway 273 part of Historical U S Highway 99 through the Siskiyou Mountains Oregon United States 42 05 32 N 122 35 22 W 42 092091 N 122 589541 W 42 092091 122 589541Tianmen Shan Big Gate Road Tianmen Mountain National Park 2 bridges Hunan China 29 03 15 N 110 29 00 E 29 05424 N 110 48344 E 29 05424 110 48344 29 03 56 N 110 28 56 E 29 06547 N 110 48211 E 29 06547 110 48211Tianxingzhou Yangtze River Bridge Tianxingzhou Exit Wuhan China 30 40 28 N 114 23 16 E 30 674541 N 114 387798 E 30 674541 114 387798Thames Tunnel planned not constructed England 1825 1843 Originally planned to have an underground spiral giving access to road traffic but this was never built 3 The Loop Over Bridge on U S Route 441 between Gatlinburg Tennessee and Cherokee North Carolina at Bearpen Hollow in the Great Smoky Mountains National Park 4 Tennessee United States 5 35 38 06 N 83 27 58 W 35 635036 N 83 466047 W 35 635036 83 466047Three bridges on Iron Mountain Road U S Route 16A South Dakota United States 1930s Known locally as pigtail bridges From south to north 43 51 43 N 103 26 15 W 43 861849 N 103 437623 W 43 861849 103 437623 43 52 10 N 103 26 08 W 43 869383 N 103 435572 W 43 869383 103 435572 43 52 30 N 103 26 22 W 43 874979 N 103 439530 W 43 874979 103 439530U S Route 61 across Spiral Bridge at Hastings High Bridge Hastings Minnesota United States 1895 1951 former location Approximately 44 44 42 N 92 51 11 W 44 745137 N 92 853034 W 44 745137 92 853034Weidun Road Bridge Changzhou China 31 43 22 N 120 03 35 E 31 722803 N 120 059752 E 31 722803 120 059752Wiadukt Stanislawa Markiewicza Warsaw Poland 1904 In Ulica Karowa which connects Krakowskie Przedmiescie to river level Yanbai Yellow River Bridge North Approach Lanzhou China 36 04 44 N 103 52 53 E 36 0789724 N 103 8814573 E 36 0789724 103 8814573Yurikamome approach to Rainbow Bridge Tokyo Japan From the mainland Zhoutouju Tunnel Approach Guangzhou China 23 05 55 N 113 15 07 E 23 0985181 N 113 2520531 E 23 0985181 113 2520531Zuidweg Bridge Zoetermeer Netherlands 52 02 51 N 4 28 31 E 52 047468 N 4 475218 E 52 047468 4 475218Spiral bicycle bridges EditThe bridge over the mainline and narrow gauge railways just west of Wernigerode Hauptbahnhof station in the Harz Germany has a spiral at each endSpiral pedestrian bridges Edit1998 2004 Glass Spiral Bridge Millennium Place Coventry EnglandTurnover bridges EditTurnover bridges were a feature of some early British canals such as the Macclesfield The boats were pulled by a horse and in locations where the towpath crossed to the opposite bank the spiral on one side allowed the horse to continue without detaching the tow rope They were not universally provided as they were more expensive to build needing to span both the canal and the towpath See also EditHairpin turn Roads section of railway spiral articleReferences Edit Historic American Engineering Record HAER No WY 86 Corkscrew Bridge Old East Entrance Road Sylvan Pass Lake Teton County WY Historic American Engineering Record HAER No SD 54 Pigtail Bridge Hot Springs Fall River County SD J W Parker The roads and railroads vehicles and modes of travelling of ancient and modern countries p 154 Historic American Engineering Record HAER No TN 35 Q The Loop Over Bridge Gatlinburg Sevier County TN Google Maps Google Maps Further reading EditThis article includes a list of general references but it lacks sufficient corresponding inline citations Please help to improve this article by introducing more precise citations November 2010 Learn how and when to remove this template message Bernie Hunhoff The Man Who Designed the Pigtails South Dakota Magazine 27 July 2006 Jim Pisarowicz Pigtail Bridge Wind Cave National Park National Park Service Brochure Welcome to the Peter Norbeck Scenic Byway United States Forest Service Missouri River Bridges of South Dakota 1920 to 1980 interview of Kenneth R Scurr Former South Dakota Bridge Engineer by Emory Johnson South Dakota State University Retrieved from https en wikipedia org w index php title Spiral bridge amp oldid 1136715313, wikipedia, wiki, book, books, library,
