Using the hammer line (main hoist), raise the impact hammer along the lead tower
to a height equal to approximately two-thirds the length of the pile to be driven.
Using the pile line (aux. hoist), raise the sheet piles to a point where the driving
tube meets the front side of the direct drive assembly. It may be necessary to
raise or lower the impact hammer using the hammer line (main hoist).
Using the pile (aux. hoist) and hammer (main hoist) lines, raise the sheet piles and
the impact hammer simultaneously allowing the driving tube to enter the direct
Then, using the crane boom, position the sheet piles over the center of the driving
location. Rotate the sheet piles while under the impact hammer until they line up
with the driving location on the ground. Adjust the length of the spotter for any final
Using the pile (aux. hoist) and hammer (main hoist) lines, lower the sheet piles and
impact hammer simultaneously. The pile may penetrate the ground under the
weight of the piles and impact hammer. The weight of the impact hammer should
be fully resting on the piles.
Using a carpenter's level, ensure the pile is plumb. Raise, lower, telescope the
boom, and/or adjust the length of the spotter to plumb the sheet piles.
Proceed to the "Startup and Shutdown" Procedure on Page H-62 to start the
impact hammer to drive the sheet piles, start the impact hammer, and then stop
the impact hammer after five strokes.
Recheck the pile to be sure it is still plumb and correct if necessary. Pull the rope
tag lines to free the ground-release shackles from the lifting holes in the sheet
Restart the impact hammer and continue driving. Repeat stopping the impact
hammer, checking the alignment of the pile, and restarting several times as
Stop the impact hammer after driving the sheet piles between five and ten feet
(1.5-3.0 m) or until the sheet piles are stable in the upright position.
This is a temporary elevation. All piles will be driven to the final
elevation after all pairs of sheet piles are driven to the temporary
Perform the following procedure to set-up the remaining adjacent sheet piles for driving:
Install the sheet pile adapter as described in the "18-inch Square (Concrete) and
Sheet Pile Adapter Installation" Paragraph on Page H-53.
Ensure the Load Moment Indicator (LMI) system on the crane is configured for
Front Hoist, Outrigger Position 100%, and Two (2) Parts of Line.
Ensure lifting holes have been cut, at the same elevation, in the return pans of
each pair of the remaining, adjacent sheet piles to be driven. If not, cut the lifting
holes. The holes should be slightly larger than the ground-release shackle pins
and should be cut in the same manner.
Connect the ground-release shackles connected to the 72-inch lifting slings on the
pile line (aux. hoist) to the lifting holes cut in the pair of sheet piles.
H-72 Change 1