*Article for Crane Brasil magazine – Issue 85
The main challenge of the operation was the very restricted space for the size of the loads, with several interferences and very complicated geometry of the loads, with several obstacles and fragile devices, in addition to galleries close to the bumping places. The pathing site even showed interference from rolling beams for rails. Another complicating factor was the tendency for the load to rotate during the lift.
Techcon Engenharia e Consultoria, headquartered in Vitória (ES), with operations throughout the country, received the TOP CRANE 2022 award, in the Rigging Plan category, for the GCMs and OFFTAKEs lifting plan for the 4th coke battery, contracted by engineering company, whose end customer is a steelworks in the Tubarão Industrial Pole, in the municipality of Serra (ES). Rigging planning was done with software developed by TechCon and BricsCAD, midas Gen and midas Civil.
The type of cargo involved is a large equipment for the production of steel coke, divided into four parts, two parts called GCM and two parts called OFFTAKE. Each GCM weighs 96 t and is 36 m long, 5 m high and 4 m wide. The offtake has an average weight of 9 t each, with 22 m in length, 2 m in width and 3 m in height. The lifting height of the entire assembly was approximately 20 m. The main challenge of the operation was the very restricted space for the size of the loads, with several interferences and very complicated geometry of the loads, with several obstacles and fragile devices, in addition to galleries close to the bumping places. The pathing site even showed interference from rolling beams for rails. Another complicating factor was the tendency for the load to rotate during the lift.
Faced with these challenges, Techcon Engenharia e Consultoria, after a detailed field survey, prepared a Rigging Plan in 3D considering the interferences and obstacles, as well as the loads in 3D for better positioning of the slings, so as not to damage the load nor the slings and design the load turning with the 2 cranes. Complementarily, it developed a specific support design for each support support to resolve interference and relieve the support force on the galleries. And it dimensioned special accessories to avoid rotation and loss of stability of the load during lifting.
The project as a whole required seven months of design, so that the operation was successfully carried out in a period of six days. Two Liebherr LTM 1500 cranes (500 t), with a 50 m jib and 135 t of counterweight, were mobilized in the assembly of the GCM and Offtake, in simultaneous operation. Two support cranes – Q70Y-K/XCMG (70 t) and ZMC75/Zoomlion (75 t) – were responsible for unloading equipment from the trailer at the assembly site.
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