Chicago Type, Double Leaf, Trunnion, Bascule Bridge Chicago Type - - PowerPoint PPT Presentation

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Chicago Type, Double Leaf, Trunnion, Bascule Bridge Chicago Type - - PowerPoint PPT Presentation

Jun 19, 2023 325 likes •660 views

Chicago Type, Double Leaf, Trunnion, Bascule Bridge Chicago Type design evolved from research in late 1890s by the Chicago Bridge Department to find a patent free design for both land and water based traffic Double Leaf two

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Chicago Type, Double Leaf, Trunnion, Bascule Bridge

  • Chicago Type – design evolved from research in late 1890’s

by the Chicago Bridge Department to find a patent free design for both land and water based traffic

  • Double Leaf – two leaves that span the river
  • Trunnion –essentially an axle; bridges rotate vertically

about trunnions

  • Bascule – “seesaw” in French; family of draw bridges that

use counterweights to assist in the vertical movement of bridge leaves

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First Generation

(1902-1910)

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Second Generation (Beaux Arts - 1910-1930)

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Third Generation (Art Deco - 1935-1950)

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Fourth Generation (Modern)

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Interesting Facts:

  • Rack and pinion lubricated with graphite, not grease
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Interesting Facts:

  • Thermal expansion can affect bridge operation.
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Interesting Facts:

  • Navigation lights required by Federal Law
  • green when fully open = safe passage for vessels
  • red all other positions
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Interesting Facts:

  • The bridges are fitted with two or more 125 horsepower

motors

  • The depth of the bridge pits that hold the counterweights:

37 ft – 66 ft (reference point uppermost sidewalk)

  • Cost to operating the bridges (estimate): $4,000 - $10,000
  • Time to operate the bridges: 8 – 10 minutes
  • CDOT maintenance program:
  • biannual inspections
  • annual power washing
  • painting at least 1x every 10 years
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Draw Bridge

Flying Drawbridge

Slauerhoff Bridge (Leeuwarden, the Netherlands)

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Bascule Bridge

Rolling Bascule Bridge

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Folding Bridge

Hörn Bridge (Kiel, Germany)

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Curling Bridge

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Vertical-lift Bridge

(Table Bridge is similar)

Pont Jacques Chaban-Delmas (Bordeaux, France)

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Retractable Bridge

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Submersible Bridge

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Tilt Bridge

Gateshead Millennium Bridge (Newcastle, England)

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Swing Bridge

Puente de la Mujer (Buenos Aires, Argentina)

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Transporter Bridge

Vizcaya Bridge (Biscay, Spain)

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Tacoma Narrows Bridge

(Tacoma Narrows strait of Puget Sound - Washington)

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Tacoma Narrows Bridge

“Galloping Gertie” November 7, 1940

https://www.youtube.com/watch?v=XggxeuFDaDU https://www.youtube.com/watch?v=lXyG68_caV4

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Hyatt Regency Hotel Walkway

(Walkways over Atrium – Kansas City, Missouri)

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Hyatt Regency Hotel Walkway

July 17, 1981

https://www.youtube.com/watch?v=LJoLFLlYfa4

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Bataan Corregidor Memorial Bridge May 28, 1949

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Bataan Corregidor Memorial Bridge May 28, 1949

https://www.youtube.com/watch?v=RAQ4CSGtaIg

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Bataan Corregidor Memorial Bridge

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Bataan Corregidor Memorial Bridge

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Bataan Corregidor Memorial Bridge

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Bataan Corregidor Memorial Bridge

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Bataan Corregidor Memorial Bridge

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Bataan Corregidor Memorial Bridge