Deep Vibrator for Concrete: Device and Methods of Work

In Why do you Need a Deep Vibrator for Concrete, we talked about the absolute need to seal the concrete mix by vibrating it. Now let’s get acquainted with the witty design of this unit and learn about the most appropriate methods of working with it.

So, we need a deep vibrator. Important: do not confuse it with the surface by accident. This happens to uninformed comrades, there were examples.

Design and principle of operation of the deep vibrator

For the construction of concrete objects in the country is best suited “vibrator for concrete with a flexible shaft.” This is its official name.

Deep Vibrator for Concrete: Device and Methods of Work

The vibrator consists of three main parts: the electric motor, the power flexible shaft with armor and the vibrating tip.

Deep Vibrator for Concrete: Device and Methods of Work

Let’s tell about each of them in a prospective way:

  1. The electric drive is a universal asynchronous three-phase electric motor. In areas where there is no three-phase voltage, a single-phase electric drive with a protective shutdown device can be used. The motor generates 3000 rpm torque, which is transmitted to the flexible shaft. The flexible shaft itself is not visible to the eye, it is hidden by an armored hose, which is usually held by the operator.
  2. Flexible shafts can be different in length: 3, 4, 5, 6, 9 m. for work on the foundations of the country length of 4 m enough for the eyes. The flexible shaft transfers the torque to the vibration end.
  3. Vibrating tip is a cylindrical capsule within which is the follower (runner). And the latter can not only rotate around its own axis, but also swing relative to the point of hinge suspension at the top of the capsule. In sum, this is called a planetary vibration mechanism. I’m not going to describe his technically witty work, only to say that it turns the shaft rotation at a frequency of 3000 rpm in the number of vibrations of the capsule about 11500 beats per minute. When describing the technology of the vibrator application, we will return to this technological miracle – an increase in the number of strokes by almost 4 times without the use of a reducer.
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For suburban use, I would recommend to buy a vibrator with a tip diameter of 28 mm or with a diameter of 38 mm. My choice is due to the traditional volume of summer work and a sufficient capacity of these aggregates.

Methods of working with a vibrator

It is most advisable to vibrate a layer of concrete mixture equal in height to the length of the Vibrating tip. A large height of the vibrator is simply ” not pull.” That is, maybe, and pull, but not so high quality.

We have to say about the capabilities of the vibrator.

  • The model with a vertically mounted vibrating tip can in one dive qualitatively seal the material with a radius of about 30 cm from the axis of the vibrator.
  • Duration of work in one point – about 2 minutes. As the experiments have shown, long time intervals do not lead to improved quality.

So you plan on a concrete conditional hook the net lowering of the tip with a pitch of about 60-70 cm, of Course, the vibration and noise generated by the vibrator does not add health to the operator. This is taken into account and limiting the time of work with the vibrator for one working shift (8 hours) up to 70 minutes (1 hour 10 minutes). Although this rule is violated all the time.

Vibrator although iron, but also not eternal. Recommended schedule of its operation – 6 minutes the machine vibrates, the next 4 minutes-rest. By the way, the resource of the vibrator before the failure – a few hundred hours.

Deep Vibrator for Concrete: Device and Methods of Work

And the last, and the most important, and sometimes ridiculous. How to include the vibrator in the work? Beginners here waiting for unexpected surprises. Here you come with a vibrator to the concrete gripper, prepared to lower the vibration tip into the mixture and turned on the packet switch on the motor (does these operations one or two, it does not matter). After switching on you heard the measured rumble of the engine and the tip, and then with a clear conscience lower it for 2 minutes in the first point. Then you move to a new point, confident that everything goes as it should. Alas, it is not.

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It is here and lies the secret of this wonderful machine. The fact is that when the electric motor is turned on, the leash only rotates, but does not generate shock waves. Therefore, after switching on the electric motor, it is necessary to hit something solid with a tip (for example, on the armature). As a result of this shock pulse, the rotating leash will come out of its equilibrium position and will not only rotate, but also run around and hit the tip from the inside. At the same time, it will start “shaking” at a frequency of 11,500 beats per minute. This is the optimal compaction efficiency of the averaged concrete mixture.

The cost of the vibrator is now quite high, but a good Foundation is worth the money. And you will get it high-quality and durable.

I dare to hope that the newcomers, for the first time taking up the vibrator this year, will share their impressions in the comments to the article. Good luck!

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