Having two cranes the same means that they both move and lift at the same rate. It is also a good idea to use cranes of the same brand and model, if possible, as this helps to make a tandem lift safer. EquipmentĮach crane’s lifting capacity goes through a downgrading - to 75% of their limit - if they are to work on a tandem lift. You also want to make sure that preparation and planning are as close to perfect as possible. The added challenge of coordinating a tandem lift means that you need to use the best equipment and the best staff available. SafetyĪs with all lifting scenarios, safety is the single biggest concern for the operators and those nearby. Newer cranes may also be able to communicate with each other to help keep the load stable, level, and safe. The weight distribution is uneven - this is where planning and expertise play a major role. The beams and hoists are separate for each crane. Each crane would have an independent lifting point on the load. This is a common way for two cranes to lift boats and ships in and out of the water.
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The load would then hang from the centre of the beam - distributing half the weight between each crane. This requires a special beam, with crane hooks at either end.Ĭrane hooks from each of the cranes would lift one end of the beam. This method employs the use of an equaliser beam with a central load link and pin. The two main methods of lifting in tandem are equalised and unequalised: Equalised Tandem Lift You want to consider the best ways of using your two cranes, depending on the situation and the load.
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Two smaller cranes can sit apart and spread the weight. Positioning - You may want to use a large single crane, but the ground is too small or unstable to support it.Sharing the weight with another crane lowers the dangers that come with bad weather, unstable ground, or awkward loads. Critical Lifting - Many factors can put a crane over its lifting limit.Ships will often have ballast and fuel that can cause their weight to shift a great deal during a lift. Ships - It is safer to have two cranes - set far below their safety ratings - when it comes to lifting a ship.Structural Beams - Bridges and premade support structures, which are both awkward and heavy.If done right, tandem lifts offer greater stability than a single crane that might be struggling at the edges of its safety rating.Ĭommon reasons for using a tandem crane lift include: Why Use Cranes in Tandem?Ī tandem lift gives you a much higher lifting capacity than a single crane. Though with precise planning and modern technology, tandem lifting is safer and easier to manage than ever. The greater the number of cranes, the more challenges there are to overcome. The process of lifting loads with two or more cranes is not new, but it is complex. Sometimes a load is too big, and you need to enlist the help of another crane. (NVQ) NATIONAL VOCATIONAL QUALIFICATIONS.SPIERINGS SK1265-AT6 MOBILE TOWER CRANE.Information provided by Link-Belt Cranes and edited by Chantal Zimmermann. “Any time we do a two-crane pick, we have two crews we will put on the job.” (16 329 kg) and lifted and placed on the center rotating joint,” said Norris. In order to combat this problem, the machine was placed on higher ground - making the lift possible. The HTC-86110 had a counterweight of more than 48,000 pounds, while the ATC-3275 had to reach 15 feet further. Then we were set up along with the ATC-3275 so we could pick the bridge and set it into place.”Īfter the planning process and everything was in place, Anglemyer Crane Rentals completed the lift without any hitches.
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“A temporary ramp was built for us to get the HTC-86110 down into the pond. “It was a little bit of a unique setup,” said crane operator, Mike Norris, who ran the HTC-86110. In order to complete this heavy lift, Anglemyer Crane Rental had to simultaneously operate two heavy-duty cranes - a difficult task. The bridge is used to circulate water in a sediment pond for the industrial production of sand. In a press-release, Link-Belt reported that an HTC-96110 hydraulic truck crane and an ATC-3275 all-terrain crane were used to complete a 155 foot long, 60,000 pound refurbished water bridge. Recently, Anglemyer Crane Rental utilized two Link-Belt cranes to successfully implement a tandem lift on a refurbished water bridge. This innovative procedure is used throughout the crane industry in various projects. The process includes more than two cranes, hoists or pieces of lifting equipment to complete a successful tandem lift. It is no secret that tandem lifts can be beneficial, increasing the rated capacity of a lift by 75 percent.