Sv-series vibrator motor — operation – Multiquip SV-SERIES User Manual
Page 13
SV-SERIES VIBRATOR MOTOR — PARTS & OPERATION MANUAL — REV. #2 (09/16/02) — PAGE 13
SV-SERIES VIBRATOR MOTOR — OPERATION
SV-SERIES VIBRATOR MOTOR OPERATION
Read
all the safety instructions carefully. Safety instructions will
be found throughout this manual and on the Vibrator Motor. Keep
all safety information in good, readable condition.
Figure 4. Compaction Coverage
with 50% Radial Overlap
THEORY OF CONCRETE VIBRATION
This
VIBRATOR MOTOR
is designed for the
compaction
of
concrete by removal of air pockets and voids.
The action of vibration is to set the particles in the fresh concrete
in motion, thereby reducing the friction between the particles
and giving the mixture the mobile quality of a thick fluid so that
gravity and the displacement of entrapped air will cause it to
settle easily into place.
By thus consolidating the concrete quickly, "stiffer" or "drier" mixes
can be poured than would otherwise be possible. It has been
proven that (up to a point) the drier the concrete, (that is, the less
water in it), the better the quality throughout and the greater the
strength.
Drier mixes also make the concrete more water tight, increase
resistance to weathering, and create a better bond between
concrete and reinforcement. Because vibration causes much of
the entrapped air in the concrete to rise to the surface,
honeycombing is prevented. Also, vibration eliminates most of
the air pockets between the concrete and the vertical forms.
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1. Make certain that the flexible shaft is properly attached to
the motor and the head to the flexible shaft.
2. Use the flexible shaft in as straight a position aspossible.
3. DO NOT bend the flexible shaft sharply at any point. Sharp
bends may cause a permanent kink, requiring early
replacement of the flexible shaft.
4. With the Stow vibrator motor properly
plugged into the correct power
source, turn the ON/OFF switch to
the "ON" position and proceed to
insert the vibrator into the cocrete.
5. The concrete is normally placed in the forms in layers about
12 to 18 inches thick in a manner which forms a fairly level
surface. The vibrator head is inserted vertically into the top
of the pile
.
6. DO NOT insert the head into the side of the pile to make the
concrete flow as this practice can cause segregation of the
aggregare from the motar. When the surface has become
fairly level, the head the should be immersed and generally
moved in the patter shown in Figure 4.
7. Immerse the head for 5 to 10 seconds, (until air stops rising),
and then withdraw it slowly to let the concrete fill the void left
by the head.
8. The head shoud be completely below the surface when
vibrating to keep the head cool.
9. When vibrating a thin horizontal slab, the head can be used
in a horizontal position.