The Left Coast Lifter hoisted the first girder segment into place at the $3.9 billion Tappan Zee Bridge project in New York.
The piece--400 feet long, 1,100 tons and made of three prefabricated, curved steel girders--was placed between two concrete piers, signaling the start of the next construction phase.
The barge that supported it had to be turned around to allow the triple girder to close in on the piers because the Left Coast Lift cannot swivel. After three and a half hours of slowly moving in midair, a horizontal assembly was dropped in place with the aid of eight ironworkers, four crane operators and a global positioning system that ensured the joining together was pinpoint accurate.
Girder safely secured in place after a 7 hour operation 3.5 hours in the air! pic.twitter.com/iwB8UAE95R
— The New NY Bridge (@NewNYBridge) June 17, 2015
Eventually, 31 miles of girders will be installed to support the 3.1-mile-long deck.