TM5-3810-307-10
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. Repeat stopping the impact
hammer, checking the alignment of the pile, and restarting several times as
necessary.
Setup Pile Sheet (Refer To Figures H-18 and H-19.)
The initial pair of sheet piles must be modified with a driving tube prior to driving. The initial pair
of sheet piles is driven without the use of the sheet pile adapter. After driving the initial pair of
sheet piles, the driving tube is then cut off and removed for re-use.
To drive the remaining, adjacent sheet piles, the sheet pile adapter is installed on the impact
hammer and the adjacent sheet piles are driven.
CAUTION
Always drive sheet piles as a slow blow rate to avoid damage to
the sheet piles. Ground personnel should observe each sheet as
it is being driven.
NOTE
To minimize any sheet pile alignment difficulties, it is
recommended that the initial pair of sheet piles be driven at the
center of the proposed structure. Follow-on sheet piles should be
driven equally on alternating sides of the center location.
Perform the following procedure to modify the initial pair of sheet piles for driving:
a.
Fit two sheet piles together.
Ensure the sheet piles are properly interlocked
together.
b.
Weld the top 18-inches (45 cm) of the center interlock together.
c.
Obtain a 72-inch (183 cm) long piece of pipe having a minimum outside diameter
of 12.75 inches (32.5 cm) by a wall thickness of 0.500 inches (1.3 cm). This pipe
will be used to create the driving tube.
d.
Cut an 18-inch (45 cm) long slot in one end of the driving tube in order to be able to
slide the driving tube over the center interlock of the pair of sheet piles. The width
of the slot should be marginally larger than the thickness of the sheet piling.
e.
Slide the driving tube over the center interlock of the pair of sheet piles and weld all
intersection points of the driving tube with the sheet piles. There are two
intersection points on the top of the sheet piles and two on the bottom (i.e. the
sheet piles will have to be turned over to weld the bottom intersection points).
f.
It is recommended that the bottom 6-inches (15 cm) of the center interlock be
welded together to prevent sheet spreading during driving.
H-68 Change 1
