Almost all pile driving is done with a crawler or
with truck-mounted cranes rigged with pile-driving
attachments, as shown in figure 8-13. The main parts
of pile-driving attachments are as follows:
1. The LEADS come in 10-, 15-, and 20-foot
sections bolted together to form various lengths.
2. The CATWALKS, also called the LEAD
BRACE or SPOTTERS, can be extended or telescoped
to various lengths. These can be set to hold the leads
vertical for driving bearing piles or to hold them at an
angle for driving batter piles.
Steps in rigging pile-driving attachments on a crane
are as follows:
1. The lead sections are assembled on the ground,
as shown in figure 8-14. The crane is lined up with the
leads, and the boom is lowered until its head is in line
with the tops of the leads, as shown in the same figure.
2. The cotter pins on the ends of the boom point
pin are removed, the adapters are installed, and the
cotter pins are reinstalled.
3. The adapters are bolted to the ends of the leads,
as shown in figure 8-15. To avoid trouble, bolt on one
adapter, and swing the boom enough to align the bolt
holes with the adapter and leads. The tops of the leads
are now attached to the head of the boom.
Figure 8-13.Typical pile-driving operation.