There, an additional telescopic crane was used to fully assemble the gantry crane while the latter’s girder remained suspended in the air. You must understand the load share for each crane, the total weight of everything under the boom head (including the hook, rigging, spreader beams, equalising devices etc.) and then add. Once set up this way, they were ready to lift the load to a height of 15m and rely on their high precision to swing it to the exact position that had been planned for it. The most important thing to note in your lift plan is that tandem lifts require you to make specific calculations about the required capacity of the cranes. In order to ensure that they would be able to lift the 45m-long, 15m-tall, 58t girder, the two cranes were configured with a main boom and 140t of counterweight. The maximum radius required for this was 42m, while the maximum radius required for the AC 500-8 crane was 24m.
if the load on any one crane, hoist or other piece of powered lifting equipment exceeds 75 of the rated capacity of that crane, hoist or other piece of powered lifting equipment. The Wiesbauer team planned for the AC 700 to deal with the toughest part, as it would have to span the entire width of the yard, all the way to the rear gantry crane rail axis, with its load side. A tandem lift involving the simultaneous use of more than two cranes, hoists or other pieces of powered lifting equipment. “This meant that we had to perform the lift working with high radii,” said Marco Wilhelm who was in charge of planning the lift at Wiesbauer. In a tandem lift, the two cranes lifted the load to the pre-planned assembly location.ĭue to the tight space conditions, there was only one single spot at the premises where the two cranes could be positioned next to each other for the tandem lift – and for one of the cranes, this meant being at a significant distance from the assembly position for the gantry crane. Lotter’s mild steel yard in Ludwigsburg, Germany. Additionally you shall be able to select the suitable lifting gear in accordance with the safe working load and weather conditions etc. This lifting plan sample also provides calculation for sling tension.
#TANDEM CRANE LIFT DRIVERS#
However companies can man the follower crane with rookies, allowing them to use their experienced crane drivers more efficiently.A Terex AC 700 and a Demag AC 500-8 supplied by Wiesbauer were used to lift a 45m-long gantry crane at Gebr. Find below safe work lifting plan template for use in crane lifting process. In some circumstances this may not be allowed for insurance reasons or national requirements.
#TANDEM CRANE LIFT DRIVER#
This means that one crane driver can operate both cranes simultaneously. This allows the leader crane to provide input like the slewing angle, hoisting height and the weight on the hook to the follower crane. Using a Controller Area network (CAN bus), the Sycratronic system connects two cranes and enables their central processing units (CPU) to communicate with each other. Without proper planning and execution, an operation can quickly turn into an OSHA statistic. The critical crane lifts require planning, experienced supervision, and precise execution. However, the biggest advantage is the elimination of communication errors between two human crane operators, which is one of the main causes for accidents. A tandem lift is a tricky, dangerous operation. The Sycratronic system monitors possible shifts of the center of gravity of the load and can correct this automatically to ensure the best stability. The system also massively increases safety. This alone is a huge advantage, as it basically increases the usable lift capacity of each crane by 25%. Due to built-in safeties, the #Sycratronic system allows the crane driver to fully use the load curve of the crane, while this is normally restricted to 75%. Tandem lifting implies that two or more cranes are used to lift one common payload that is attached to each of the cranes hooks. The biggest benefits are improved efficiency and increased safety. While the system is developed to improve crane operations in all heavy-lift sectors, it could in particular prove useful in the (offshore) wind industry where long components and tandem lift operations have become the norm. With the Sycratronic system improving the safety of tandem operations, this makes it easier for terminal operators to scale up their lift capacities to over 600 tonnes when combining two LHM 800 cranes. #tandemoperation #windindustry #rotorblades Liebherr - Tandem lifting crane assistance: Liebherr Sycratronic® for LHM
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