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Pile-Driving Operations
Figure 12-52.-Lead adapters connected to the boom tip.

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure  12-49.—Typical  pile-driving  operation. Figure 12-50.-Assembly of 10- and 20-foot lead sections. section bolts for tightness at the beginning of each pile-driving  shift. The types of leads used in the NCF are swinging, underhung,  extended  four-way,  and  spud  leads. Swinging  Leads Swinging leads are assembled facedown on the ground by bolting the 15-foot tapered section to the selected  intermediate  sections.  A  single  crane  line holds the pile-driving hammer that is slipped into and guided by the rails of the swinging leads. This lead is hung from the crane boom with a second single line from the crane. The lead is spotted on the ground at the   pile   location, normally  with  stabbing  points attached to the bottom of the leads, and held plumb or at the desired batter with the second single crane line. Short  swinging  leads  are  often  used  to  assist  in  driving 12-37







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