As applied at the construction site station concrete heating

Year-round implementation of monolithic construction work allows the building to be commissioned on time. That is why the developers create new technologies and equipment, allowing not to stop working even during severe frosts. An example is the KTPTO 80 concrete heating station, due to which it does not freeze and retains its qualities.

Similar devices differ in simplicity of a design and ease in operating time. Their use allows you to significantly speed up the process. In addition to new, you can use and b after repair.

The essence of this method is simple - in the very mass of concrete there is a conversion of electrical energy into heat, which leads to its heating. The speed of the process and its maximum temperature directly depend on the power of the devices. For example, the latter can be brought up to 100⁰WITH.

Tip: if you need to dismantle concrete structures, the best option is to cut the reinforced concrete with diamond circles.

The principle of the device

When the ambient temperature drops below + 4⁰C, to work with concrete solutions require additional heating. Currently, there are many ways to work with the material in winter.

These methods include, for example:

• infrared heating;
• insulation formwork.

However, they are all quite expensive. Therefore, the heating of concrete heating wires from the transformer can be called the most economical and efficient.

The actions of such a mechanism are quite simple:

1. Work requires transformer and wires, and their length is selected for each object separately.
2. The latter, on the one hand, join the reinforcement frame, and, on the other hand, they are fed to the substation to warm up the concrete.
3. With the passage of electric current through the wires, their temperature may rise to +80⁰WITH.
4. After that, the heat released during heating is distributed throughout the entire volume of the concrete mix.. As a result, it can warm up in winter to temperatures of + 40-50⁰WITH.

The most effective for this process are the wires, the thickness of the steel wire is 1.2 or 3 mm. At the same time, there is a separate group specially made for heating concrete mixes (PNSV-1,2).

When calculating the required number of wires should be remembered that at 1 m³ the mixture takes about 60 m, the price depends on the cross section and the number of lived

For such purposes, these types of transformers are used:

• KTP-OB (20.60 and 160);
• KTPTO-80.

One such device is able to heat a concrete mix with a volume of 20-30 cubic meters.

Tip: the wires must be placed in the mass of concrete, otherwise they can simply burn out.

Requirements before the heating process

The wire for heating the concrete mix is ​​placed with your own hands on the framework of the reinforcement, as well as between them, immediately after they are laid in the formwork. At the same time, it is not recommended to stretch the wires (find out here how the concrete is heated in the winter).

Tip: the instruction requires to avoid contact with the formwork and going beyond the limits of the mixture.

For the wire coming out of the transformer, plastic insulation must be provided. At the same time, this wire should be 2-3 times thicker than that used in the concrete mix.

Requirements during the heating process

All work with a transformer must be carried out by specialists who have the necessary experience. During the operation of the station is not allowed to find anyone else, except the fitter.

Before starting work, all employees who will operate in close proximity to the transformer are required to receive safety instructions.

Let's take a closer look at the technical features of one of the transformers used for heating concrete - KTPTO-80-11-U1:

1. The KTPTO 80 concrete heating station uses a voltage of 380 V, at a frequency of 50 Hz and a power of 80 kVA.
2. This device is specifically designed for use during construction.
3. It has a function installed that allows temperature adjustment in automatic mode.
4. In addition, the concrete heating station can be used for a short time and not for the main purpose. For example, it is ideally suited as a power supply for temporary illumination, and can also be used as a current source for building tools powered by 42-phase three-phase sources.

The basis of this station is a power type transformer - TMTO-80, which is equipped with:

• protective casing;
• sleds;
• control cabinet.

To its outputs it is necessary to connect the wires that will be used to heat the concrete mix. After which they are laid out throughout its volume.

After turning on the transformer, the wire is under the influence of voltage, which is used for heating. Thanks to good heating, even at low ambient temperatures, the concrete will harden evenly, without the formation of ice crystals within its structure.

Tip: for the manufacture of channels in the thickness of concrete structures will help diamond drilling holes in concrete professional crowns.

Technical characteristics of the device

The maximum power of the transformer is 80kVA, while the voltage value on the HV side is 380V.

In idle mode, the voltages on the CH side are 55/65/75/85/95 V, and the electrical / current parameters on it with:

• the value of the voltage 55 / 65V is 520A;
• with a value of 75/85 / 95V - 471A.

1. The nominal value of the power on the low voltage winding is 2.5 kVA;
2. The nominal value of the voltage on the low voltage side is 42V;
3. The value of the rated power of an independent power source - 25kVA;
4. Temperature range of heating - 20-100⁰WITH;
5. The values ​​of length / width / height - 1.4 / 1.01 / 1.47 m;
6. The total weight is 500 kg.

Conclusion

Использование специального оборудования для подогрева бетонной массы в зимний период позволяет добиться качественного ее застывания. Лучшим вариантом из многих считается сочетание нагревательных проводов с трансформаторной подстанцией. В данной статье был подробно рассмотрено оборудование – КТПТО-80 (см.также статью «Бетонные панели для забора – преимущества и установка»).

The video in this article will help you find additional information on this topic.