Pile Driving Techniques

Figure 10-15.-Cross section of an advanced base timber pier.

Builder 3&2 Volume 02 - Construction manual for building structures
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The superstructure (fig. 10-15) consists of a single layer of 4 by 12 planks laid on 19 inside stringers measuring 6 inches by 14 inches by 14 feet. The inside stringers are fastened to the pile caps with driftbolts. The outside stringers are fastened to the pile caps with through-bolts. The deck planks are fastened to the stringers with 3/8- by 8-inch spikes. After the deck is laid, 12-foot lengths of 8 by 10s are laid over the outside stringers to form the curbing. The lengths of curbing are distributed as shown in the general plan. The curbing is bolted to the outside stringers to form the curbing. The lengths of curbing are distributed as shown in the general plan. The curbing is bolted to the outside stringers with bolts. The pier is equipped with a fender system for protection against shock, caused by contact with vessels coming or lying alongside. Fender piles, spaced as shown in the part plan, are driven along both sides of the pier and bolted to the outside stringers with bolts. The heads of these bolts are countersunk below the surfaces of the piles. An 8 by 10 fender wale is bolted to the backs of the fender piles with bolts. Lengths of 8 by 10 fender pile chocks are cut to fit between the piles and bolted to the outside stringers and the fender wales. The spacing for these bolts is shown in the part plan. As indicated in the general plan, the fender system also includes two 14-pile dolphins, located 15 feet beyond the end of the pier. A dolphin is an isolated cluster of piles, constructed as shown in figure 10-16. A similar cluster attached to a pier is called a pile cluster. PILE DRIVING TECHNIQUES When driving piles of any type, always watch both the pile and equipment. Care must be taken to avoid damaging the pile or the driving hammer. Watch the piles carefully for any indications of splitting or breaking below ground. The next section covers some of the more common problems you might encounter. Springing and Bouncing Springing means that the pile vibrates too much laterally. Springing may occur when a pile is crooked, when the butt has not been squared off properly, or Figure 10-16.-Dolphins. 10-9

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