construction basic equipment used for consolidating concrete and other spaces

1. V
I
B
R
A
T
O
R
S
CONSOLIDATING CONCRETE

2. VIBRATION
 OSCILLATION OR REPETETIVE MOTION OF
ANY OBJECT IS CALLED VIBRATION.
 THE IMPACT OF A VIBRATION IS
EFFECTIVE WHEN THE FREQUENCY OF
VIBRATION IS MORE THAN ITS
AMPLITUDE.
 COMPACTION DONE WITH HELP OF
GRAVITY.
 THE VIBRATORS FOR COMPACTING
CONCRETE ARE MANUFACTURED WITH
FREQUENCIES OF VIBRATION FROM 2800

3. INTERNAL AND EXTERNAL
VIBRATION
 INTERNAL
VIBRATION IS
VIBRATING THE
CONCRETE FROM
WITHIN THE
FORMWORK, WHILE
EXTERNAL
VIBRATION IS
VIBRATING THE
FORMWORK FROM
THE OUTSIDE.
 BOTH ARE DONE
FOR ACHIEVING
ADEQUATE
CONSOLIDATION.

4. CONSOLIDATING CONCRETE
INADEQUATE
CONSOLIDATION CAN
RESULT IN:
 HONEYCOMB
 EXCESSIVE AMOUNT OF
ENTRAPPED AIR VOIDS
(BUGHOLES)
 SAND STREAKS
 COLD JOINTS
 PLACEMENT LINES
 SUBSIDENCE CRACKING

5. TYPES OF VIBRATORS
 INTERNAL VIBRATORS.
–FLEXIBLE SHAFT TYPE.
–ELECTRIC MOTOR IN HAND TYPE.
–AIR VIBRATORS.
 FORM VIBRATORS.
 VIBRATING TABLE.
 SURFACE VIBRATORS.

6. INTERNAL VIBRATION METHOD
d
X
Vibrator
VERTICAL PENETRATION A FEW
INCHES INTO PREVIOUS LIFT
(WHICH SHOULD NOT YET BE
RIGID) OF SYSTEMATIC
REGULAR INTERVALS WILL GIVE
ADEQUATE CONSOLIDATION
RADIUS OF ACTION
SYSTEMATIC VIBRATION OF EACH NEW

7. INTERNAL VIBRATORS
Diameter
of head,
mm (in.)
Recommended
frequency,
vibrations per
minute
Approximate
radius of
action, mm
(in.)
Rate of
placement,
m3/h
(yd3/h) Application
20-40
(3/4-1½)
9000-15,000
80-150
(3-6)
0.8-4
(1-5)
flowing concrete in
thin members. Also
used for lab test
specimens.
30-60
(1¼-2½)
8500-12,500
130-250
(5-10)
2.3-8
(3-10)
concrete in thin walls,
columns, beams,
precast piles, thin
slabs, and along
construction joints.
50-90
(2-3½)
8000-12,000
180-360
(7-14)
4.6-15
(6-20)
Stiff concrete (less
than 80-mm [3-in.]
slump) in general
construction .

8. INTRERNAL VIBRATORS
IMMERSION OR NEEDLE
VIBRATORS
 This is perhaps the most
commonly used vibrator. It
essentially consists of a steel
tube (with one end closed and
rounded) having an eccentric
vibrating element inside it. This
steel tube called poker is
connected to an electric motor or
a diesel engine through a flexible
tube. They are available in size
varying from 40 to 100 mm
diameter. The diameter of the
poker is decided from the

9. EXTERNAL OR SHUTTER
VIBRATORS
 These vibrators are clamped
rigidly to the form work at the
pre-determined points so that
the form and concrete are
vibrated. They consume more
power for a given compaction
effect than internal
vibrators.These vibrators can
compact upto 450mm from the
face but have to be moved
from one place to another as
concrete progresses. The
external vibrators are more
often used for pre-casting of
thin in-situ sections of such
shape and thickness as can
not be compacted by internal
vibrators.

10. SURFACE VIBRATORS
 These are placed directly on the
concrete mass. These best suited
for compaction of shallow elements
and should not be used when the
depth of concrete to be vibrated is
more than 150 mm.
 Very dry mixes can be most
effectively compacted with surface
vibrators. The surface vibrators
commonly used are pan vibrators
and vibrating screeds. The main
application of this type of vibrator is
in the compaction of small slabs,
not exceeding 150 mm in
thickness, and patching and repair
work of pavement slabs. The
operating frequency is about 4000
rpm at an acceleration of 4g to 9g.

11. VIBRATING TABLE
 The vibrating table consists
of a rigidly built steel
platform mounted on flexible
springs and is driven by an
electric motor. The normal
frequency of vibration is
4000 rpm at an acceleration
of 4g to 7g. The vibrating
tables are very efficient in
compacting stiff and harsh
concrete mixes required for
manufacture of precast
elements in the factories
and test specimens in
laboratories.

12. FV QUICK CLAMP VIBRATORS
Piston
Diameter
Length Weight
Jaw Opening
Size
FV 1- ¼" 8 - ½" 12 ½ lbs. 2 – ⅜"
FV 2" 9 - ½" 22 lbs. 3 – ½"
The FV Quick Clamp is ideal for use on
cement forms, wooden forms, steel forms
and core boxes.
The FV forces out air pockets, improves
surface finish and speeds up mold
release when used on cement forms.
Benefits
•'Quick Clamp' vibrators are of a one-
piece construction design.
•Variable vibration frequency and impact
force is obtained through
adjustment of air pressure. (from 20 to 70
p.s.i.)
•Equipped with it's own clamp, the 'Quick
Clamp' eliminates
the need for mounting brackets.
•2 sizes available.

13. TAMPER
 The BRECON Tamper is made to
fulfill the highest requirements
when it comes to precise
compaction combined with
durability in rough work places like
foundries.
 Compacting small surfaces of
refractory materials in Foundries is
the major use of the BRECON
Tamper.
 The Tamper is light and easy to
handle. The proven design
assures a powerful compaction
while reducing transmission of the
vibration to the operator. The quick
tool change combined with various
accessories provides a
very flexible and accurate work
result.