sure the load reactions and wind loadings stay safely within the crane’ s design,” said Rosenberger.
“ This was a first for all of us,” said Quinonez.“ No one had ever before paired two air-propulsion load controllers on something this big, let alone in the kind of winds common in Oklahoma.”
After confirming that the two-Navigator system would be an excellent solution for
Two battery-powered, remoteoperated, Vita Load Navigator 2.0 air-propulsion load controllers, visible near each end of the girders, eliminated the need for taglines. The Navigators rotated this 230-foot, 426,000-pound double girder with 1-degree accuracy in winds that blew at up to 15 miles per hour.
controlling each load without taglines, Central Bridge rented two Vita Load Navigator 2.0 units, and the lifting team worked out the details of the setup.
The team decided the most effective arrangement would be to mount one Navigator 2.0 near each end of the single or double girders that were being lifted, arrange for the two Navigators to talk to each other so they could work in unison, and design the control system so both could be operated with just one wireless remote control.
Precise Process Too long to be shipped in one piece, each girder arrived from the fabricator as one 120-foot and two 55-foot sections.
Central Bridge bolted the three sections into one girder 230 feet long by 8 feet tall.
To help assure the girders would sit stable once they were in place on the piers, eight of the girders were connected into pairs with cross bracing before being picked and placed as two-girder units.
The remaining two girders were set as singles that were connected to their adjacent girder after being set in place.
When a girder or connected pair of girders had been
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