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Left Coast Lifter made its first lift on the new Tappan Zee bridge in April 2015, [22] a steel-reinforced concrete pile cap which formed part of the bridge's foundation. The massive crane was being used for heavy lifts of large bridge sections, [23] and placed the final steel girder for the new Rockland-bound (westbound) span in October 2016. [24]
The operator runs the trolley over the ship to lift the cargo, usually containers. Once the spreader locks onto the container, the container is lifted, moved over the dock, and placed on a truck chassis (trailer) to be taken to the storage yard. The crane also lifts containers from chassis on the dock to load them onto the ship.
To lift a load, a separate line runs up and over the mast with a hook on its free end, as with a crane. [ 1 ] [ 2 ] Derricks are especially useful for high-rise rigging, jobs that cover a long period of time, or jobs when the impact to street or pedestrian traffic is a concern. [ 3 ]
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Dock plates are generally made out of aluminium whilst dock boards are generally made out of steel for greater strength. Aluminium dock plates are more suitable for lighter loads, including the weight of handcarts and dollies, whereas steel dock boards are used for heavier motorized equipment such as fork lift trucks and electric pallet jacks.
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Weeks 533 is a 500-short-ton (454 t) capacity Clyde Iron Works model 52 barge-mounted crane which is the largest revolving floating crane on the East Coast of the United States. [1] It was originally ordered for bridge construction and has since been used in several notable heavy lifts.
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