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Rigging Spotlight
The rectangular spreader beam and synthetic roundslings in basket-hitches minimized forces on the pressure-sensitive concrete pipe walls and joints.
The frame’ s nominal size was 11 feet by 11 feet, but on this job, it was used as large as 13 feet by 13 feet and as small as 11 feet by 11 feet.
“ Using the CMOD to lift the tridents and Cross T center box enabled balanced four-point vertical connection to the load, which minimized any chance of lateral
stress,” said Walsh.
Each of the CMOD’ s four corners was connected to the crane’ s hook by a 15-foot synthetic round sling and to the load below by a wireless load cell and a 30-foot synthetic roundsling configured in a basket hitch.
“ We selected synthetic round slings and basket-hitch configuration to provide a relatively soft point of contact with the pipe wall,” Walsh said.“ And we deployed the load cells to verify and monitor load balance and the force applied to the pipe.”
He added that the load monitors were placed between the CMOD and the slings supporting the load in order to measure the forces most accurately.
“ As a matter of good engineering and rigging practice, it’ s best to place the load cell as close to the force point as possible,” he said.“ In this case, it was particularly important that we closely monitor all four points of connection as accurately as possible.”
The rigging also included four comealongs to permit fine tuning of the load
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