Enarco VET Manuel D'instructions page 33

A: Weight of mould / form (kg)
B: Weight of concrete (kg)
C: Constance dependent upon the consistency of the concrete and the rigidity of the mould. Its value lies
between 2 and 4.
D: Mass of vibrating part, including vibrators (kg)
3. Unloading silos
In the discharge mouth of the silos, often depending on the conditions of the material, it cakes, so that the
installation of vibrators is necessary.
•
They are placed in the conical part in such a way that they produce accelerations of 1 to 2g,
that is to say of a centrifugal force of 1 to 2 times the weight of material in the hopper.
•
It is recommended to place them at 1/3 of the height of the conical part and must be fixed on a
rigid profile.
•
When the height of the conical part is greater than 4m, it is recommended to put another row at
2/3 of the height.
•
The external vibrator must be placed on the wall of the hopper with a lower angle of inclination
with respect to the horizontal.
MONO-PHASE AND THREE-PHASE EXTERNAL VIBRATORS
Mould attached to vibrating table: F = C(D+B+0.2A)
VET VEM
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