Dawson EMV 550, Owner'S Manual

Page: 16 / 63

h. Start the vibrator and adjust (crowd) the hydraulic rams so that the vibrator is level and always sits
directly on top of the pile as it goes into the ground. Do not over push the vibrator - stop pushing
when the gearbox starts to vibrate against the rubber stops on the underside of the saddle (the
deflection is 146mm (5.75”).
i. When the pile has reached the required depth turn the vibrator off by returning the control lever to
the central position and allow all vibrations to stop. Release the hard jaws from the pile by slowly
operating the control lever in the opposite direction. Do not operate the control lever from one
extreme position to the other whilst the EMV is running – it will cause hydraulic system pressure
spikes to occur.
j. Remove the chain clamp and lifting chain from the pile lifting hole.
k. Repeat steps c-j to continue.
l. When piling progress is less than 100mm/min (4ins/min) release ground
resistance by augering or by water jetting. Under no circumstances should the pile be forced any
further.
EXTRACTING PILES
a. Ensure that all safety procedures and maintenance has been carried out before starting the
excavator.
b. Ensure that it is safe to move the dipper arm. Release the stand from the jaws of the vibrator by
operation of the retract bucket ram control function in the cab. Manoeuvre the vibrator above one
end of the pile to be extracted so that there is enough distance to allow safe insertion of the lifting
chain through the hole at the top of the pile. Confirm suitable hole in pile.
c. Insert the lifting chain correctly (no twists, knots etc) through the lifting hole in the pile and secure
with the chain clamp. Allow enough free chain length for the pile to rotate to horizontal during
the lowering process without jamming against the underside of the clamp body. If this happens
thechain will be overloaded, may subsequently break and allow the pile to fall – this is a sever
hazard to all site personnel and must be avoided at all times.
Under no circumstances should a pile be pulled using the lifting chain only.
d. Clamp the vibrator onto the pile head ensuring that it is level. Ensure all personnel are out of the
High Risk Area .
e. Start the vibrator and allow the soil to loosen around the pile. Start to lift up the pile. Ensure the
pile clutches are not rubbing together. Pay attention to the distortion of the rubber sandwich
mounts - under no circumstances should these mounts be allowed to deflect by more than the
stipulated amount shown on Figure 1 in section 2.0. Reduce the extraction force to continue
pulling. Continue extracting the pile until the pile foot is almost extracted. Stop vibration at this
point and carefully pull the pile out the remaining short distance.
f. Move the pile to a suitable area, and place the pile on the ground. Ensure that all personnel are
out of the High Risk Area .
g. Hold the pile on the ground and release the jaws. Raise the vibrator off the pile slowly ensuring
that there is no snatch on the lifting chain. Slowly lower the pile towards the ground.
h. Remove the chain clamp and lifting chain from the pile lifting hole.
i. Repeat steps c-h to continue.
excavator mounted vibrator
16
continued - operating instructions