TM 5-3810-307-10
Emergency Shutdown of the Impact Hammer
The crane operator can perform the following procedure to shutdown the impact hammer in an
emergency:
a.
Use the hammer line (main hoist) to raise the impact hammer at least two inches (5
cm) from the pile being driven. This will disrupt the pre-combustion pressure in the
lower cylinder of the impact hammer and cause the fuel injection to stop, thereby
shutting down the impact hammer.
In the event the above shutdown procedure does not work and the impact hammer is accessible
by ground personnel, the following procedure can performed to the shutdown the impact
hammer in an emergency:
a.
Turn the two fuel pump feed and return shutoff valves, located directly below the
fuel tank, to the off position (handles perpendicular to the lines).
Setup Pile Steel H-Beam (Refer To Figure H-17.)
Perform the following procedure to set-up a steel H-beam pile for driving:
a.
Ensure the correct size guide plate is installed on the direct drive assembly of the
impact hammer. If not, install the proper guide plate as described in the "Guide
Plate Installation" Paragraph on Page H-52.
b.
If not removed, remove and stow the five-ton headache ball and install a ground-
release shackle on the pile line (aux. hoist). Attach a rope tag line to the ground
release shackle cut to a length at least equal to that of the pile being driven.
c.
Ensure the Load Moment Indicator (LMI) system on the crane is configured for
Front Hoist, Outrigger Position 100%, and Two (2) Parts of Line.
d.
Cut two holes on the outside flanges of the pile to be driven. Cut the holes
approximately 60 inches (1.5 m) from the top of the pile, one on either side. The
holes should be slightly larger than the shackle pin and there should be no less
than 1 inch (2.5 cm) of steel remaining to the outside edge of the pile.
e.
Connect the H-type pile lifting sling shackles to the holes cut in the pile. Due to
excessive vibration caused by driving steel H-beam piles, lock wire the pins to
keep them tight. Then attach the H-type pile lifting sling to the ground-release
shackle attached to the pile line (aux. hoist).
f.
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.
g.
Open the swing arm on the pile gate.
h.
Using the pile line (aux. hoist), raise the pile to a point where it 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).
i.
Using the pile (aux. hoist) and hammer (main hoist) lines, raise the pile and the
impact hammer simultaneously allowing the pile to enter the direct drive assembly.
Allow the pile to come to a vertical position then close the swing arm on the pile
gate. Ensure the latch on the pile gate springs shut.
Change 1 H-65
