Structural Unlimited LLC was tasked with constructing the parking garage structure for the new CHKD Mental Healthcare facility located on Gresham Drive. The first floor of the parking garage is 19 ft. 10.5 inches high to accommodate ambulance needs going to the facility.
Structural Unlimited, LLC used one of their 330 ton Liebherr LR 1300.1 SX crawler cranes fitted with carbon fiber pendants to lift and set concrete wall panels in place for each level of the parking garage. The construction of the nine-story parking garage began in January 2021 and was completed in April 2021. The LR 1300 operated up to 12 hours a day handling the precast wall panels that weighed between 50,000 to 90,000 lbs. Each panel was lifted and placed side by side and then welded together.
The LR 1300.1 SX crawler crane has a lifting capacity of 330-ton with a possible hoist height of up to 664 ft. For special lifts, where a higher load chart is required, a super lift attachment can be attached. The crawler cranes high horsepower engine provides plenty of power for simultaneous movements of swing, main boom, and luffing jib without slowing down, which makes job site operations like steel hanging very fast. Furthermore, the machine is designed to quickly assemble and disassemble. “We quite often disassemble, move and assemble an LR 1300.1 SX within the same day,” mentioned Andy Merrell, owner of Structural Unlimited LLC.
The LR 1300.1 SX is used in various applications such as steel erection, pre-cast, and infrastructure work. The LR 1300.1 SX was the best solution for the CHKD parking garage project because of the crane’s ability to make a pick-up of 90,000 lbs. at 110 feet outreach. The LR 1300.1 SX’s outstanding load chart proved to be an advantage.
Additionally, there are many innovative optional equipment features available for the LR 1300.1 SX. One of those features is the new Boom-up and down assistance system which increases operational safety during assembly and disassembly. This assistance system indicates the approach to the tipping point and automatically stops operation before the operator unintentionally enters an unsafe zone. It also takes the machine’s configuration as well as wind into consideration.
At this specific job site, Structural Unlimited was faced with the challenge of making sure the luffing jib tip remained underneath the Liebherr tower crane working on the same job site. The LR 1300.1 SX was equipped with 95 ft. of main boom and 125ft of luffing jib. The LR 1300.1 SX luffing jib can also be outfitted with a 3-part/99,210 lbs. aux. jib/rooster which on this particular job site Structural Unlimited did not require.
Andy Merrell, owner of Structural Unlimited LLC said, “Liebherr’s reputation for developing reliable, high performing products were part of my decision to purchase Liebherr LR 1300’s.” Structural Unlimited LLC currently owns four Liebherr LR 1300.1 SX, all equipped with carbon fiber pendants for increased capacity and operates them in the southeast United States. Structural Unlimited LLC was founded in 2009 and is based out of Huntersville, North Carolina.
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