More lifts per crane cycleĪs the operator now has two spreaders attached to the crane, the operator has the power to lift more containers per cycle. The height of the SingFlex headblock and container spreaders attached is 3 metres, which means crane operators can reach new heights whilst operating in tandem. In addition, the height between the sheeve and the bottom of RAM’s 2940 STS spreaders means terminals can accommodate large mega vessels without risk of having equipment that is too low. Tandem headblock’s can be used on single hoist cranes, which weigh much less and cost significantly less than a dual hoist crane. Many ports and terminal operators think tandem lifting requires an investment of a dual hoist crane as well as a headblock but this simply isn’t true. Tandem lifting has opened a new avenue to improving port productivity and efficiency. Tandem means ‘side by side’ as opposed to ‘end by end’ – in this case, tandem lifting is a crane hoisting two container spreaders at the same time. This is where tandem lifting comes into the field of play. This meant that the Terex Demag duo had to keep the load perfectly in place for several hours.In recent years, container terminals are accommodating larger container vessels, which has led to growing pressures on ports to load and unload containers more productively. There, an additional telescopic crane was used to fully assemble the gantry crane while the latter’s girder remained suspended in the air. 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. 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. 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. “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. A Terex AC 700 and a Demag AC 500-8 supplied by Wiesbauer were used to lift a 45m-long gantry crane at Gebr.
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