🔫 🚨 🤤 Construction vibrator for concrete 👩🏼‍🎤 👎🏽 👨🏼‍🏭

To obtain a strong monolithic concrete block, the composition should be compacted by squeezing out the remaining air. Earlier, for such purposes, “manual” methods were used - piercing the solution. With the development of technology in construction, special-purpose devices appeared - vibrators for concrete.

Under the influence of waves, excess air is forced out and taken out. Keep in mind the influence of weather conditions on the quality of the material (e.g. temperature, humidity and even atmospheric pressure). Given all the recommendations, you can choose the most optimal technique.

Scope of application

Portable vibrators for concrete are used in many areas of construction (for example, during casting, installation, erection of reinforced concrete structures, foundations, slabs, columns, etc.).

They are used to increase the strength of all existing concrete structures.

Before use, pour the mixture into the final styling form and align it over the entire plane. Despite the high power of downhole tools, the thickness of the cement should not exceed 60 cm. Otherwise, the air from the mixture will not be completely removed.

Holding the flexible shaft, the tip slowly sinks into concrete. The cultivated area should not exceed 8 centimeters per second. The tip should be pulled out at such a speed that the air does not have time to fill the resulting cavity.

Important! When working with fittings, avoid touching it with the device.

Varieties

In construction, various types of equipment are used, which are divided according to their purpose into:

surface (used for a solution of small thickness);
external - are used when pouring thin-walled reinforced structures;
deep vibrators for concrete are the most powerful, ideal for work with volumetric structures (for example, foundations, supports, dams, etc.).

By the method of creating vibration waves and the power source, the technique is divided into the following types:

Electromechanical. In such devices, vibration is produced by converting the rotational energy of the shaft into vibrational.
Pneumatic In this case, the energy of the air passes into vibration waves.
Mechanical. Such concrete vibrators are equipped with a small drive with an internal combustion engine.
Electromagnetic and hydraulic.

By speed and frequency of vibrations, all devices are divided into:

Low frequency. In this case, the oscillation frequency does not exceed 3.5 thousand kol / min. They are ideal for compacting coarse mixtures.
Midrange. Such vibrators operate at a frequency of 3.5 to 9 thousand vibrations per minute and are used for "medium" concrete.
High frequency. This type is most often used for a fine-grained solution, and the number of vibrations per unit time is from 10 to 20 thousand.

Principle of operation

The most common devices - deep vibrators for concrete (type of drive electromechanical) - consist of:

flexible hose;
electric motor (power from 1 kW);
tip.

The principle of operation is as follows: voltage is supplied to the drive from the mains. Through a flexible shaft (1 to 7 meters long), the torque is transmitted to the rotor. Fluctuations from the last mechanism arrive at the tip (mace or bayonet).

The nozzle is presented in the form of a pipe (production material is stainless steel, the shell is coated with a polymer). The ends of the drive are carefully sealed with rubber gaskets. A massive shaft rotates in the inside of the nozzle (using a bearing assembly). The difference between the center of gravity of the shaft and its axis creates vibrational waves. The frequency of the waves depends on the power of the drive.

The most common are cylindrical and conical nozzles. The first of them is designed for standard concrete, which is poured into formwork with little reinforcement.

The second is suitable for heavy reinforcement. It is worth noting that the vibrator may be supplied with various types of nozzles (their diameter may also vary).

Important! The parameters of the tool should be such that working with it does not bring inconvenience. These parameters include weight, drive length, etc. If the length exceeds 1.5 meters, at least two operators must service the device.

Specifications

The average performance of the devices looks like this:

power consumption - 0.75 kW;
depth vibrator voltage for concrete - 220 V;
required current frequency - 50 Hz;
shaft rotation speed at a given power - about 3000 rpm;
dimensions of the engine (LxWxH) - 315x76x200 mm;
the size of the flexible shaft is about 1 meter;
weight - from 6 to 9 kg;
tip parameters - diameter: from 28 to 51 mm, length - 410 mm;
oscillation frequency - about 18 thousand.col./min .;
driving force - from 0.72 to 3.28 kN.

For domestic needs it will be enough to choose a device with a power of 750-1500 watts. For production - 3-4 kW or more.

The most affordable vibrators have a drive length of 1 to 1.5 meters. To work with complex products, more expensive models are used. In such a shaft can be a length of 6 to 15 meters.

Advantages and disadvantages

Among the key advantages, excellent operational characteristics are highlighted, as well as:

ease of use and maintenance;
light weight;
the possibility of smooth adjustment of the oscillation frequency;
high reliability;
excellent concrete quality after applying the tool.

The disadvantages are:

high price;
in designs with a built-in frequency converter, the electric drive is built into the working tip, therefore, in case of violation of safety precautions or the integrity of the device, it is possible to get an electric shock. It is worth noting that the requirements for connecting a vibrator for concrete to a network of 220 V.

If you plan to work in a large enterprise, it is better to choose professional tools. They wear out more slowly and have greater productivity.

Concrete Vibrator: Overview

Among the most popular models, the following are distinguished:

"Energomash BV-71101". This device is designed to work at a depth of 1 meter. Power is supplied from a 230 V network. At the same time, the power of the deep vibrator is 1 kW. The number of vibrations is 4000 count / min. The length of the power cord is 2 meters. It is also worth noting the small weight of the device - 1 kg 950 g. A distinctive feature is the d-shaped handle. Also, the device is protected from increased loads. On the housing is the lock button.
BauMaster CV-7110. This deep vibrator is designed to work with a solution 1 meter thick. Tip diameter - 35 mm. The delivery set includes carbon brushes and the flexible shaft itself. Power is supplied from a 230 V network, and the device power is 1000 watts.
Popular for work at greater depths (up to 1.5 meters) is the Titan BEV600. Despite the small engine power (only 600 W), the device transfers long-term loads without problems. Power supply requires a voltage of 230 V.
The budget option is the Stark CV-850 Industrial. To work, you need a 220 W network. A vibrator for concrete produces 13 thousand vibrations per minute with a power of 850 watts. Among the negative characteristics - the lack of a flexible shaft in the package.
Demanded for construction work has become the Honker HP-ECVE. This deep vibrator has the same characteristics as above. A distinctive feature is the set of nozzles in the kit - their diameter is adjustable from 32 to 45 mm.

How to choose the right technique

When choosing construction equipment of this type should be considered:

Power. It is selected depending on the upcoming work and appointment.
The vibration frequency of the working tip. For fine-grained concrete, a high-frequency device is suitable. A low amplitude of oscillations together with a high frequency will achieve the best effect. For home use, a portable vibrator with an average frequency of oscillation will be ideal.
Weight of fixture. A handheld device can be operated without additional assistance. The hand tool is also compact and convenient for transportation. The average weight of such a device is 6 kg. More powerful installations that are used by construction crews can weigh up to 100 kg, and a whole team will be required to service them.
When selecting, you should also pay attention to the length of the working part and its diameter. Depending on the purpose, you can choose a tip with a diameter of 25 to 110 mm.
When pouring deep formwork, another 1 meter should be added to the main shaft length.

By the speed of rotation, you can choose both a special and a universal vibrator. The first is designed for a specific type of concrete (depending on the size of the fractions), and the second has the ability to switch from one frequency to another.

How to make it yourself

Almost any tool can be made with your own hands. A vibrator for concrete is no exception. It can be constructed on the basis of a perforator or drill. A cable can serve as a drive.

To make the nozzle you will need:

Steel pipe (whose diameter is 5.5 cm and the wall thickness is 1.5 mm). The required pipe length is 50 cm.
A pair of 52 mm roller bearings.
The cable is 1 meter long and 1.5 cm in diameter.
Iron cap (for plugging the pipe).
Square rod (metal required). At the same time, its length should be at least 40 cm, and the width of the side - 2.5 cm.
A metal circle with a diameter of 20 cm and a length of 55 cm.
Sleeve made of PVC pipe. The length should correspond to the size of the cable.

To bring the shaft into working condition, it is required to weld a rod with a square section along the entire length to the rod. The distance from the edge (under the bearing) must be at least 15 mm.

Assembling a vibrator for concrete with your own hands is done in the following order:

The working shaft is inserted into the pipe, then the bearings are packed on it. Roller bearings should fully enter the pipe. You can verify the installation by manually rotating the shaft.
Next, the end of the working pipe is plugged with a cap and sealant.
At the opposite end, make a hole with a diameter of 1.5 cm and secure the cable in it. For fastening, it is necessary to drill a hole on the opposite side under the clamping screw.
After the operations are completed, a sleeve is put on the cable and the working end of the pipe. In this case, all connections with an interference fit should be made. The connection is strengthened with screeds (for example, a clamp).
The opposite end of the cable is mounted in the drive cartridge (drill or perforator).

At the end of the work, the tool is ready to perform operations.

Important! In order to protect the case from the negative effects of the solution, you can put on it a cover of rubber material.

Rules for the use of technology

For the most efficient use of a high-frequency vibrator for concrete, the following requirements should be adhered to:

Immerse the working part of the tool to the maximum depth under a slope.
In one place, the device is aged for about 20-30 seconds (until the appearance of a characteristic cement milk on the surface).
To get the working part should be slow and smooth.
Transfer to a neighboring place should be no more than 1.5 radius of action (depending on power).
The frequency of concrete hardening depends on the thickness of the structure. For example, for tall buildings, compaction is done every 1.5 meters in width.
It is not worth overexposing the recommended operating time. This can lead to deterioration in the quality of concrete and damage to the equipment.

Subject to safety measures, labor intensity is significantly reduced and the quality of the finished product is improved.

It is also necessary to carefully monitor the oil level and lubrication of the working parts of the vibrator for concrete. The frequency of replacement of these materials depends on the design of the vibrating tip. On average, oil changes every 200 to 400 hours of operation.

Important! There must be no lubricants on the pendulum nozzles.

If the temperature rises on the tips of the flexible shafts, the wire drive should be lubricated. The selection of materials and the rules for caring for the equipment are described in detail in the instructions from the manufacturer.