a specific direction for us to lift and place it effectively, and they would cast it that way,” said Cordova.
Full Supporting Cast of Equipment
The fleet of equipment that Alliance brought to the job included the Liebherr LR 1750, a Tadano AC 250 all-terrain crane, a Liebherr LTR 1100 teleboom crawler crane, a Magni RTH 6.35 rotating telehandler, and a Merlo P120.10 fixed-body telehandler.
The AC 250 stayed on the job only long enough to assemble the big 825-U. S.-ton LR 1750 crawler crane, which was
rigged with 253 feet of boom.
In that configuration, the LR 1750 uprighted all the concrete panels and set the heavier pieces of structural steel, including three 120-foot-long trusses that each weighed 35,513 pounds with rigging and were set at radii to 165.6 feet.
The LTR 1100 primarily set structural steel, and the Magni RTH 6.35 rotating telehandler set lighter steel and also handled the four long temporary braces that supported each panel until it was secured in place by structural steel.
The Merlo P120.10 fixed-body telehandler shook out steel at the laydown yard, carried it a
Above: The finished performing arts center is a highlight of Carlsbad, New Mexico. Its construction was complicated by buildings on three sides, including a high school just 15 feet away.
Left: Alliance used two-point rigging in eight places to tilt up the tallest panels. The four temporary braces each weighed more than 1,000 pounds, so all were placed by a Magni telehandler.
Right: After the LR 1750 had set three 120-foot-long trusses, the Magni telehandler and Liebherr LTR 1100 teleboom crawler crane set the rest of the structural steel, roof decking and catwalks from inside.
quarter mile to the building site, and hung low-level steel.
As mentioned earlier, the big rig on this job was the LR 1750.
Although it would handle all the panels except the last two from inside the building’ s footprint, Alliance needed to figure out where within that footprint it needed to sit.
That was no small task for a crane whose crawler base measures 39 feet 1 inch long by 33 feet 10 inches wide, and whose counterweight tailswing is 28 feet seven inches.
One consideration was that the crane’ s counterweight tailswing would need to pass above the stage, which sat 12 feet above the seating area’ s floor, but the LR 1750 has only about
18 September 19, 2025 www. contractorshotline. com