jja st. james presentation
DESCRIPTION
A presentation on the new John James Audubon Bridge, the longest cable-stayed bridge in the Western Hemisphere, crossing the Mississippi River in south-central LouisianaTRANSCRIPT
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St. James EpiscopalMay 10, 2011
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Bill Grass, JJA SpokespersonLouisiana TIMED Managers
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Louisiana TIMED Program• Created by Act 16 of the
1989 Louisiana legislature & voted for by the people
• Largest transportation program in state history
• Sixteen specific projects across the state
• Designed to stimulate economic development
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Louisiana TIMED Managers
• Hired in 2002 by Louisiana Department of Transportation and Development to accelerate the TIMED program
• Joint venture– Parsons Brinckerhoff– GEC, Inc.– The LPA Group, Inc.
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John James Audubon Bridge Project
• One of the TIMED program’s 16 projects
• Contractor is Audubon Bridge Constructors, a joint venture of– Flatiron Construction Corp.– Granite Construction– Parsons Transportation Group
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John James Audubon Bridge• Naming the new bridge after John James
Audubon exemplifies the importance & preservation of the rich history & heritage of the region
• As Pointe Coupee & West Feliciana parishes are widely regarded for their abundance of wildlife, amazing landscapes, & preserved historic structures from the days of Audubon, it is only fitting that the new bridge be named in his memory
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John James Audubon Bridge
• The John James Audubon Bridge is the longest cable-stayed bridge in the Western Hemisphere
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What is a Cable-Stayed Bridge?
• Consists of one or more towers with cables that support the deck
tower
deck
cable
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Cable-Stayed vs. Suspension
• The towers carry the load on cable-stayed bridges– Cables support the deck
• The two large suspension cables carry the load on suspension bridges– Suspender cables, or
hangers, support the deck
Primary load-bearing structure
Primary load-bearing structure
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Cable-Stayed vs. Suspension
• Cable-stayed bridges are good for medium-length crossings
• Suspension bridges are ideal for long-length crossings– The largest single-span bridge in the world
is a suspension bridge
Pearl Bridge’s main span: 6,532 feet (1.2 miles)…over 4x longer than the Audubon
Bridge’s main span!!
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Types of Bridges
• Cable-stayed bridge– Hale Boggs Memorial
Bridge (“Luling Bridge”)
• Suspension bridge– Golden Gate Bridge
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Types of Bridges
• Cantilever bridge– Horace Wilkinson
Bridge (“New Bridge”)
• Truss bridge– Hampden Bridge
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Types of Bridges
• Arch bridge– Sydney Harbour
Bridge
• Beam bridge– Lake Pontchartrain
Causeway
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JJA General Facts
• 2.44-mile four-lane elevated bridge structure with two 11-foot travel lanes in each direction with 8-foot outside shoulders and 2-foot inside shoulders
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JJA General Facts• Approximately 12 miles of two-lane
roadway connecting LA 1 east of Hospital Road in New Roads to U.S. 61 south of LA 966 and St. Francisville
• Four new intersections at existing LA 1, LA 10, LA 981 (River Road) and U.S. 61 for entry to and exit from the new roadway and bridge
• Seven smaller bridges included in project
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JJA General Facts
• Project broke ground in May 2006
• The bridge is the longest cable-stayed bridge in the Western Hemisphere– Main span is 1,583 feet
(almost 1/3 mile)
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JJA General Facts• First design-build project
in Louisiana• Bridge is the only
Mississippi River crossing between Baton Rouge and Natchez
• $409 million total cost
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Economic Development
• What the Audubon Bridge brings:– A more efficient and reliable route for
Pointe Coupee and West Feliciana– A more efficient route for commerce and
shipping traveling from central Louisiana– Increased traffic provides opportunity for
gas stations, restaurants, hotels and other businesses along the corridor
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Audubon Mainspan Quick Facts
• Towers– 520’ height– 2 crossbeams– Anchored by 42
drilled shafts 180’ into the Mississippi
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Audubon Mainspan Quick Facts
• Mainspan Deck– 1,583’ length– Approximately 130’ elevation– Composed of 428 precast
concrete panels in 63 segments
– 136 stay cables (4,548 individual strands) attached ranging from 220’ to 830’ in length
– 4’ and 8’ expansion joints
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Bridge Opening• Bridge was opened on May
5, 2011 due to rising water in the Mississippi River– High water closed ferry
service
• Construction not complete, but bridge is 100% safe for traffic
• Construction will end in late 2011
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Bridge Opening Photos
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Tower Construction
• Footings– 42 (21 each) drilled shafts anchored into
Mississippi– Cofferdams constructed above water and
lowered; water then pumped out– Cofferdam specs:
•160’ x 64’ x 55’•2500 tons
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Cofferdam Photos
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Cofferdam Photos
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Cofferdam Lowerings
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Tower Construction
• Footings– Pedestals constructed– 35 tower “lifts” of 13’ segments performed
on each tower
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Time-Lapse Video
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Audubon Bridge Project Fun Facts
500’
1000’
1500’
State Capitol460’
Audubon Tower520’
One Shell Square, N.O.(Tallest Building in
Louisiana)697’
RMS Titanic882’
Empire State Building1,453’
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Audubon Bridge Project Fun Facts
• Deck is 241,600 square feet– Approximately four football fields
• Deck weighs approximately 25.7 million lbs.– Approximately 6,000 tons more than the
Eiffel Tower
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Audubon Bridge Project Fun Facts
• 5,668 cubic yards of concrete in deck– Would fill almost two Olympic-sized
swimming pools
• Approximately 13.5 miles of cable stays– Would stretch from downtown Baton
Rouge to Denham Springs
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Audubon Bridge Project Fun Facts
• Approximately 473 miles of individual strands– Would stretch from Baton Rouge to Atlanta, GA
• Approximately 3,300 miles of wire in the strands– Would stretch from Baton Rouge to Anchorage,
AK• Approximately 500,000 bolts used
– If placed ½ mile apart, would stretch from Earth to the moon
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Be sure to visit www.audubonbridge.com!