Figure 12-48.-In-line approach with dragline.6. Salvage pieces of hoist wire rope for use as thedump rope.PILE-DRIVING OPERATIONSPile driving in the NCF is done with crawler- ortruck-mounted cranes rigged with pile-drivingattachments, as shown in figure 12-49. The pile-drivinghammer is categorized under the 36-00000 USNnumber registration series.NOTE: The combined weight of all thepile-driving attachments reduces the capacity of thecrane. Additionally, the crane capacity must be able tosupport the combined weight of all of the pile-drivingattachments.LEADSPile-driving leads serve as tracks along which thepile-driving hammer runs and as guides for positioningand steadying the pile during driving operations. Theleads come in 10-, 15-, and 20-foot sections boltedtogether to form various lengths, as shown in figure12-50.NOTE: Because of the vibrations created duringpile-driving operations, you must check all the lead12-36
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