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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]
Schematic sketch of a modern steel trench shore being lowered into a trench. During excavation, shoring systems speed up excavation and provide safety for workers since trenches can be prone to collapse. In this case, shoring should not be confused with shielding. Shoring is designed to prevent collapse where shielding is only designed to ...
By 1978, the heaviest lift recorded by Sun 800 was a 785-short-ton (712 t) deckhouse. [20] In 1979, it was used to help raise the stricken barge Elizabeth Turner. [8] Sun 800 was used for heavy lifts during the demolition of the central vertical lift spans of the CRRNJ Newark Bay Bridge in 1981, removing 4,500 short tons (4,100 t) of steel in ...
Inflatable lift bags and rigid steel pontoons have been consistently useful as submersible buoyant lifting devices for salvage work. [6]: Ch. 13 Tidal lift s mainly use the rise of tide to provide the range of motion of the lift, but some additional lifting capacity is available by de-ballasting the lift craft. The lift craft are often barges ...
Several methods can be used to shore up a trench. Hydraulic shoring is the use of hydraulic pistons that can be pumped outward until they press up against the trench walls. This is typically combined with steel plate or a special heavy plywood called Finform.
A team of riggers design and install the lifting or rolling equipment needed to raise, roll, slide or lift objects such as heavy machinery, structural components, building materials, or large-scale fixtures with a crane, hoist or block and tackle. Rigging comes from rig, to set up or prepare.
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