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

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

First Generation (1902-1910)

Second Generation (Beaux Arts - 1910-1930)

Third Generation (Art Deco - 1935-1950)

Fourth Generation (Modern )

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

Interesting Facts: Thermal expansion can affect bridge operation. •

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

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

Draw Bridge Flying Drawbridge Slauerhoff Bridge (Leeuwarden, the Netherlands)

Bascule Bridge Rolling Bascule Bridge

Folding Bridge Hörn Bridge (Kiel, Germany)

Curling Bridge

Vertical-lift Bridge (Table Bridge is similar) Pont Jacques Chaban-Delmas (Bordeaux, France)

Retractable Bridge

Submersible Bridge

Tilt Bridge Gateshead Millennium Bridge (Newcastle, England)

Swing Bridge Puente de la Mujer (Buenos Aires, Argentina)

Transporter Bridge Vizcaya Bridge (Biscay, Spain)

Tacoma Narrows Bridge (Tacoma Narrows strait of Puget Sound - Washington)

Tacoma Narrows Bridge “Galloping Gertie” November 7, 1940 https://www.youtube.com/watch?v=XggxeuFDaDU https://www.youtube.com/watch?v=lXyG68_caV4

Hyatt Regency Hotel Walkway (Walkways over Atrium – Kansas City, Missouri)

Hyatt Regency Hotel Walkway July 17, 1981 https://www.youtube.com/watch?v=LJoLFLlYfa4

Bataan Corregidor Memorial Bridge May 28, 1949

Bataan Corregidor Memorial Bridge May 28, 1949 https://www.youtube.com/watch?v=RAQ4CSGtaIg

Bataan Corregidor Memorial Bridge

Bataan Corregidor Memorial Bridge

Bataan Corregidor Memorial Bridge

Bataan Corregidor Memorial Bridge

Bataan Corregidor Memorial Bridge

Bataan Corregidor Memorial Bridge