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 eachpile-driving shift.The types of leads used in the NCF are swinging,underhung, extended four-way, and spud leads.Swinging LeadsSwinging leads are assembled facedown on theground by bolting the 15-foot tapered section to theselected intermediate sections. A single crane lineholds the pile-driving hammer that is slipped into andguided by the rails of the swinging leads. This lead ishung from the crane boom with a second single linefrom the crane. The lead is spotted on the ground atthe pile location,normally with stabbing pointsattached to the bottom of the leads, and held plumb orat the desired batter with the second single crane line.Short swinging leads are often used to assist in driving12-37
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