TM5-3810-307-10
j.
Ensure there are no obstructions along the proposed swing path. Then, using the
crane boom, position the pile over the center of the driving location. Adjust the
length of the spotter for any final adjustments.
k.
Using the pile (aux. hoist) and hammer (main hoist) lines, lower the pile and impact
hammer simultaneously. The pile may penetrate the ground under the weight of
the pile and impact hammer. The weight of the impact hammer should be fully
resting on the pile.
l.
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 pile.
m.
Proceed to the "Startup and Shutdown" Procedure on Page H-62 to start the
impact hammer to drive the pile, start the impact hammer, and stop it after five
strokes.
n.
Recheck the pile to be sure it is still plumb and correct if necessary. Pull the rope
tag line to free the ground-release shackle from the 96-inch wire rope lifting sling.
o.
Restart the impact hammer and continue driving.
p.
When the H-type pile lifting sling shackles are accessible from the ground,
shutdown the impact hammer and remove the H-type pile lifting sling from the pile.
Then restart the impact hammer and continue driving to the desired depth.
Setup Pile Pre-cast Concrete (Refer To Figure H-17.)
Perform the following procedure to set-up a pre-cast concrete pile for driving:
a.
Ensure the 18-inch square (concrete) pile adapter is installed in the direct drive
assembly of the impact hammer. If not, install the 18-inch square (concrete) pile
adapter as described in the "18-inch Square (Concrete) and Sheet Pile Adapter
Installation" Paragraph on Page H-53.
b.
Inspect the cushion inside the 18-inch square (concrete) pile adapter.
If
necessary, replace in accordance with the following procedure:
1)
Remove all damaged cushioning material from inside of square (concrete)
pile adapter.
2)
Using the plywood template for the square (concrete) pile adapter, fabricate
a new cushion.
3)
If installed, remove the pile gate as described in the "Pile Gate Removal"
Paragraph on Page H-78.
4)
Place the new cushion on blocking that is almost the same size as the inside
of the square (concrete) pile adapter (The sheet pile adapter can also be
used) and place under the square (concrete) pile adapter.
5)
Lay a piece of 1/2-inch (1.25 cm) cable over the cushion and let it rest in the
small grooves.
6)
Using the hammer line (main hoist), lower the impact hammer and suspend
the square (concrete) pile adapter over the cushion. Slowly lower the
impact hammer and work the pile adapter down over the cushion. If done
correctly the cables will wedge the cushion in place.
H-66 Change 1
