Often when rewriting, overhaul, the change of interior decoration, a question appears, as in concrete or brick walls, create a hole for switch, an electrical outlet or pipes conducted? Ordinary drills on wood or metal in such situations, of course, do not suit: they instantly lose their properties. Specialized devices are needed, including crowns on concrete structures of various sizes.
What is a crown on concrete?
Today, the use of concrete is practiced at all stages of installation and construction work: from the construction of the foundation and wall structures to the fill of overlaps and screeds of different types.
As a consequence, the presence of a charming toolkit, ready to drill holes in concrete structures, is extremely relevant for any type of construction (housing, public, industrial). Concrete crown – one of the types of driving equipment, by which holes in the carrier and enclosing structures of buildings and structures made from concrete are drilled. Such a procedure is necessary in the following work:
- Laying networks of engineering and technical support of all sorts of direction: sewage and plumbing, power grid and communication lines, automation systems and fire extinguishing;
- Installation of technological and electrical equipment;
- Installation of anchors and other fasteners;
- Installation of components of carrier and enclosing structures of various purposes.
Types of nozzles for concrete perforators
Crowns are made only of solid alloys of metal materials that make the product strong, persistent and efficient. Often, newcomers are interested in what kind of purpose the crown has a centered drill? Through this drill, you can make exact holes. His absence can lead to the occurrence of vibrations when driving – a hole will be deformed, distorted and uneven. Crowns are classified in accordance with the design of shanks. They are produced by the following types.
- SDS-PLUS – models that are put in domestic perforators.
- SDS-MAX – are operated exclusively in professional processes. The diameter of the shank is 20 millimeters.
- Drills with a hexagon shank – a similar type of crown is practiced for drilling a large holes by means of electric drills.
Crowns differ in the material from which the cutting area (teeth) is made. There are 3 products options.
- Wireless – For the manufacture of teeth for the crown, the alloy of cobalt and tungsten is used in a proportion of 8% and 92%. The characteristic properties of these nozzles are resistance to high temperatures and long-term loads. They are applied by reinforced concrete or brick.
- Carwide – This type of product is considered budget and is intended exclusively for performing holes in concrete grounds. Clashing with iron leads to damage to the teeth crowns of solid alloys.
Diamond are one of the most expensive, but along with this effective. Diamond drilling tools possess a number of positive qualities: they are not afraid meeting with metal. That is why in reinforced concrete, perform a hole is possible exclusively to the instrumentaries of this type. There are many modifications with a variety of diameters on sale. In addition to a particularly popular crown on concrete of 68 millimeters, devices for concrete 100 mm, 110 mm, 120 mm, 130 mm and 150 millimeters are also in demand. Equipment with a similar large diameter is practiced to drill holes in reinforced concrete or brick walls under the pipe. The quality of the obtained hole is very high: almost no chipping, cracks and other surface flaws appear.
It should also be noted that the crowns differ by cooling methods. They are wet and dry.
Nozzles having holes on the side walls of the bowls belong to dry. Wet considered closed-type bowls, which during the drilling need to wet water. Watering with water, both samples of nozzles can be wetted, as it will not only increase the life of the devices, but also reduce the accumulation of the resulting dust in the process of carrying work.
Based on the drilling technology, nozzles are additionally divided into unstressed and shock. The first option is suitable only for functioning in drilling mode and is often used for electrically engines. Impact devices can be operated by using the punch hammer function on the perforator.
Sizes of nozzles
To correctly select the sizes in the size of the crown, it is necessary to know the diameter of the generated hole under the power supply or another component – for example, under the diameter of the pipes or the coverage of the wiring line during the mounted electrical intercommunications. When buying a crown in a trading point, it is necessary to find out from the seller-consultant its technical parameters that are available in the accompanying documents or on labeling. Crowns can be implemented both individual products and special sets of several units of different values.
The main component of the switches or installation boxes for the socket is located in the standard outer diameter – 68 millimeters (with an inner diameter of 60 millimeters), in connection with this concrete crowns for boxes for 68 millimeters – these are the most sought-after devices. Less used nozzles for 70 and 75 millimeters. To launch communication highways, the nozzles with a diameter of 300 millimeters are especially common.
The choice of the tool also affects its length and the number of elements of the cutting area: 5, 6 or 8 – the higher this indicator, the more significant the performance of the nozzle.
The set of nozzles for concrete for boxes for the socket is included and the centering drill, the function of which lies in the concentration of the crown in the center of the generated hole, not allowing to vibrate in the working material. The centering drill is required to replace frequently because it is rapidly blinking. The crown is designed to permeate the depth of the material to 1.5 meters.
Features of applying concrete nozzles
If the shank of the selected crown corresponds to the perforator clamping device, it is necessary to simply put and secure in the working position, no adapters need. You can start drilling concrete by label.
Drilling carbide crown
Nozzle can be equipped or no centering drill. If it is available, then the tip is placed at a right angle to the plane of concrete in the zone where the middle of the hole will be located. If such a drill the structure of the cup does not provide, then the cutting edge circle is pressed to concrete. Start drilling without effort – the cutting edge must choose a shallow tunnel and straighten your direction. When it seems that the nozzle lay down as it should, the device is fed forward with pressure.
It is not necessary to extract the drill until it dries concrete to the necessary depth or bottom of the crown does not wither in the wall. From the holes made not through, the roll of the cut concrete is smelted by the peak. For gears with carbide shutters, most importantly, competently determine the procedure for the functioning of the perforator. You should not allow unnecessary heating of the edge, therefore, after one or two holes, you need to give the device to cool.
Diamond crown drilling
If you need to prolong the duration of the operation of the reinforced concrete nozzles, it is required to use water spraying, the cooling part. In particular, it matters to fixtures with soldered edges, because with excess heating they will fall off. Such crowns are practiced for more complex equipment than manual perforator. It is fixed on reinforced concrete, and the operator remains only to flow drill, making the hole deeper.
However, a toolkit can be used in the home environment, which is capable of functioning in an electric mode, since diamond nozzles cut hard materials with an unstressed way.
Selection of nozzles
Choosing a nozzle on concrete, it is necessary to take into account 2 important conditions: from which a concrete structure is made (concrete brand for strength and reinforcement parameters of reinforced concrete), and with which the crown becomes. Despite the fact that the lion’s share of nozzles has compatibility with various types of electric drills and perforators, it is impossible to say that every crown is suitable for any tool.
It comes primarily from the perforator cartridge model – SDS-Plus (they are equipped with light perforators weighing up to 5 kilograms) either SDS-MAX (it is put on more powerful and heavy devices). The nozzle must be with the corresponding shank. There are adapters that allow you to put a crown of one type of perforator with a different type of cartridge, only it is desirable to choose a nozzle, exactly suitable for the tool.
More about the crowns on concrete, see the video below.