is set in place, a hole for a driftbolt is bored through the cap into the top of each pile, and the driftbolts are driven. The transverse and longitudinal bracing is then put on. Sometimes, however, the bracing may be installed before the piles are capped.

PLACING PILES BY JETTING

Jetting often makes pile-penetration easier. Jetting is the process of forcing water under pressure around and under the pile to lubricate and/or displace the surrounding soil, as shown in figure 8-25. In soils other

Figure 8-25. - Jetting with a single jet pipe,