is made up of a cylinder, a ram piston, a fuel pump, a
built-in fuel tank, a lubricant oil tank, and an inertia oil
pump that lubricates mechanically during operation.
The diesel pile hammer is about twice as fast as a
conventional pneumatic, or steam, hammer of like size
and weight. A conventional pneumatic hammer
requires a 600-cubic-foot-per minute compressor to
operate, while the diesel is a self-contained unit
constructed in sizes that deliver up to 43,000
foot-pounds of energy per blow.
A pile-driving CAP is a block (usually a steel block)
that rests on the butt or head of the pile and protects it
against damage by receiving and transmitting the blows
of the hammer or ram. In the steam, or pneumatic,
hammer, the cap is a part of the hammer. The cap with
a drop or diesel hammer is a separate casting, with the
lower part recessed to fit the head or butt of the pile, and
the upper part recessed to contain a hardwood block
which receives the blows of the hammer. The cap is
fitted with a wire-rope sling so that the cap, as well as
the hammer, may be raised to the top of the leads when
positioning a pile in the leads. Pile CAPS are available
for driving timber, concrete, sheet, and H-beam piles.
Figure 8-20 shows an example of a steel H-pile and a
special cap for driving.
Figure 8-20.H-beam pile-driving cap.
As the project supervisor of a pile-driving
operation, you must be aware of the safety precautions
and procedures involved when working with and around
Statistics on accidents show that a free moving
power crane is one of the most destructive machines
used in the Navy, as well as in private industry. Over
one third of the victims of crane accidents are operators;
more than one fourth are crew members other than
operators. Ironically, the people who sustain the most
injuries from cranes are the very ones who can do the
most to prevent injuries. Most crane accidents are
preventable simply because they are caused by
situations, conditions, or actions under the control of the
operating crew. The term preventable accident is
illogical; if an accident were preventable, it would not
be an accident, but an act of omission or commission by
Most crane work is, or should be, a coordinated
activity of a team of skilled technicians and workers.
The lives and well-being of the whole team are in the
hands of each member of the team during a continually
shifting scene requiring constant judgment and
responsibility. The pile-driving crew is usually made
up of the following personnel:
During any pile-driving operation, the
SIGNALMAN is the boss of the rig and is normally the
only person giving signals to the operator. The only
signal any other person may give that the operator will
obey is the EMERGENCY STOP SIGNAL. Refer to
the Equipment Operator Basic, NAVEDTRA 12535,
for more information regarding crane safety.
Standard safety and accident prevention procedures
developed to govern general construction operations
apply also to pile-driving operations. Pile driving is
hazardous, and personnel should take adequate care to
be protected from injury. Close cooperation between
the Equipment Operators and crew members
(Builders/Steelworkers) is essential to avoid accidents.