Sunday, June 25, 2017

1983 I-310 Bridge over Mississippi River at Luling, LA

(Bridge Hunter, John Weeks III3D Satellite (32 photos), formal name: Hale Boggs Memorial Bridge)

More info on the barge-mounted 60-foot ringer crane that was created to build the bridge is here. The big crane was then bought by the Cooper River Construction company to build the Arthur J. Ravenel Jr. Bridge.

Ben Stalvey posted
Dennis Gigoux reposted with a lot of commentary
Steve Khail This was another of my photo shoots for Manitowoc. The Luling Bridge was a very high profile project that was also featured in a Budweiser TV ad.

Mike Larson 60' diameter PLATFORM-RINGER, similar to the RINGER that went with a 4600 Series-4 crane, but with the crane replaced with a platform, winches, and counterweight replacing the crane itself. It was designed for applications like this, in which the a company was going to use the machine in one place and didn't need the crane itself.

Anthony Gugliuzza It now belongs to the USACE .
Under Construction, from Bridge Hunter
John Weeks III
"The Hale Boggs Memorial Bridge, also known as the Luling Bridge, was the first major cable stayed bridge to be built in the United States. The bridge is somewhat unusual for a cable stayed structure in that is has very few stay cables. In addition, the deck is built like a box girder, which is a much more robust structure than typically seen on suspended bridges....The bridge towers soar 400 feet into the air, with the deck having 155 feet of clearance between the sea-level water and the low bridge steel over the navigation channel." It was designed to survive hurricane force winds and Katrina demonstrated that the design worked. [John Weeks III] As I used to say at work, "being on the cutting edge of technology means you bleed a lot." Between 2009 and 2012 all of the cables were replaced because the original ones were beginning to corrode. The new cables are seven-wire strands coated in grease then encased in plastic. The original 72 cables were sealed with grout before being encased in plastic. The problem was that the grout began to crack and allowed water to make contact with the cables causing the steel to corrode. The new cables did not meet specification and had to be replaced. [NOLA: 1, 2] There were additional problems with rust and water leakage in the anchorages. [Wikipedia, (the ENR reference link does not work)]

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