Pipes for underground cable laying. What do you need a pipe for cable laying in the ground, specifications

During the installation of communication networks as a protective shell, the PND tube for a cable is often used. It is often used when laying power lines. PND Tube very reliably protects the cable from the effect on it the wandering currents, the aggressive impact of soil and mechanical damage. Cable mounting technology depends on the location and purpose of engineering networks.

Application of PND pipes for installing communications

For laying power lines and other engineering communications Apply different types PND pipes. They differ constructive features and technical parameters:

  1. When laying an electrical cable in brick wall Or a floor screed use smooth PND pipe black.
  2. Products with corrugated outer side are used for mounting hidden, semi-width and open way For telephone, electrical, computer and television networks, operating from electrical voltage of direct or alternating current, the value of less than 1000 volts. Electrical equipment of this species can function indoors and outdoor space.
  3. For laying cable in the ground, PND pipes with a corrugated surface are used, characterized by high strength and elasticity and elasticity, as well as the simplicity of installation and the ability to restore the lost form.

Depending on the product specification, it can be equipped with a probe. The probe is a special design designed to pull the cable inside the pipe. With it, you can reduce the time of laying of communications and power networks.

In the absence of probe, the cable is pulled using special reusable equipment. In this case, the complexity of the process increases slightly, and the need to purchase technical devices appears. At the same time, the PND tubes for a cable that do not have broach can be used several times. This is especially true when frequent repairs Communication systems.

Among the companies producing PND pipes for laying a cable is now the most popular DKS. This manufacturer manufactures corrugated "Octopus" pipes, which are used to install hidden wiring inside the building. In addition, DKS manufactures various boxes and accessories that allow the commissioning of communication in full compliance with the established rules.

Advantages of PND pipes

Compared with metal protective covers, PND pipe for the cable will cost the owner much cheaper. This is evidenced by the fact that for laying power lines and other communications, it is not necessary to use products issued according to the requirements state Standard. For these purposes, production is performed from secondary raw materials. Technical PND Trumpet is made from industry waste, mixed with various polyethylene additives. This slightly changes the performance and color of products, but it makes it possible to significantly reduce costs in the manufacture, thereby reducing the cost.

In addition, polyethylene communication pipes low pressure Possess the following advantages:

  • Separate parts of the design can be connected without using welding equipment;
  • The life of the product under normal conditions exceeds 50 years;
  • Pipes have a small mass compared with metal protective covers;
  • Have a high electrical insulation indicator, so do not require grounding;
  • Do not lose their qualities due to an aggressive environment and corrosion;
  • Retain their characteristics even in aggressive operating conditions and can withstand the temperature difference from -25 to +70 degrees Celsius;
  • Do not excrete condensate on the surface and do not produce toxic substances.

The cable inside the PND tube can be laid on any necessary trajectory without using the connecting elements, because the polymer is very good. In particular, it is easy to change the design of products of small diameter. At the same time, it should not be bending the PND pipes very much, because because of this, there may be a hall and the cable will not extend.

Electrical cable laying technology

The technical features of the installation of PND pipes depend on the conditions for its use and location of the cable. These characteristics affect the list of equipment used and the necessary structural elements.

  • Installation in fence structures

Indoor electrical cable, closed pipe PND, packed by the following technology:

  1. The location of the cable is planned;
  2. The pipe is fixed, while it can be attached to the floor using metal brackets, and to walls and ceiling with special fastening elements with a latch;
  3. The cable is pulled so that it is located freely, without tension;
  4. The construction on the floor is poured with a screed of concrete, and in the ceiling or wall close up with stucco or other materials, depending on the size of the protective casing.

Using the PND pipe, it is possible to reduce the length of the electrical wiring and carry out a cable hawk and repair work without the likelihood of damage to the surface of the walls and ceilings.

When installing communications inside the building, you can use different kinds Connecting parts for attaching individual elements of the protective case: couplings, taps and other components. However, elements with a corrugated surface for turns in the location of the structure through the slab overlapping or transition between different planes are most in demand. In this case, polyethylene pipe can be bent even at right angles, which cannot be made without the use of additional structural elements. According to current instructions for installing hidden wiring, which is located inside walls or floors from non-combustible materials, the use of corrugated and smooth PND pipes is allowed.

  • Laying PND pipes in the soil

Such technology is very in demand when laying communications in private homes and at dachas. Before you start work, you need to carefully examine the cable and check the integrity of the protective casing. In case of damage to the shell, the protective function of polyethylene pipes will lose its meaning.

  1. Make marking and dig a trench of the required depth;
  2. A polyethylene tube of the desired size is prevented into the pit with a stretch of or without it;
  3. The cable is pulled and stacked so that it is free;
  4. The pipe fall asleep with a layer of sand with a thickness of about 10 centimeters, and then the ground by 15 centimeters.

To quickly find the location of the cable over it, you can lay a special signal tape.

When using PND pipes for laying power networks underground, it is desirable not to use clutches and other connecting elements, because it may worsen the sealing of the system. Do not forget that the use of fittings when the cable is removed in the structure. For laying cable on a straight section, it is best to use solid parts with a cross-sectional diameter of more than 4 millimeters. In the event that the site is too long, then to tighten the electrical cable you need to use the elastic metal wire or a special cape broach. Initially, they are triggered inside the pipe, and then tighten the tied cable.

  • Laying cable without trench

For installation of an electrical cable, located in places with difficult accessibility, use trenchless laying technology. Most often, it is used by utilities, because it is performed with attraction special equipment and complex equipment. Essence this method Cable gaskets consists in horizontal drilling, allowing to lay communication underground without impairing the surface layer of the soil. Initially, the composition of the soil is studied, after which it is necessary to obtain permission to carry out similar works. After the installation of the cable in the PND tube begins, which includes the following steps:

  1. Drilling pilot well. The soil puncture is performed using a drill head having a built-in radiation and a bevel in front. During its entry into the ground, a mixture filling the well is supplied through special holes. It reduces the likelihood of the collapse and cools the heated equipment.
  2. The expansion of the well is performed by the Rimmer replacing the drill head.
  3. Laying PND pipes with cable inside. The design is tightened into the well using the drilling rig.

The main disadvantage of the technology of horizontal directional drilling of the Earth is the complexity of the process, so when conducting such works, it is necessary to conclude a contract with specialized organizations that have staff and the necessary equipment for such work.

Laying cable with low-pressure polyethylene pipe protection provides reliable protection Communication systems for long term, but do not forget about installation instructions, because even a small negligence can reduce all the work on "no".

PND Tube for cable laying in the ground

When choosing a product, you must pay attention to two pipe characteristics: the diameter of the pipe and its appearance.

The diameter of the inner section of pipes should be at least one and a half-way outer diameter for cables with multi-breeding veins and double-outer diameter for cables with single-robes.

In each of these cases, for cables up to 10 kV, it is impossible to use pipes with an inner diameter of less than 50 millimeters with a length of up to 5 meters and less than 100 millimeters with a larger length of the design. For example, if you need to pave a cable with a small cross section for a distance of 6 meters, then it is necessary to use pipes with a diameter of more than 100 millimeters. When designing networks of special importance, it is recommended to use two-axis PND pipes with a diameter of 110 millimeters, even in cases where some areas are less than 5 meters in length. Despite the fact that it leads to excess costs, as pipes with a smaller diameter and their installation are cheaper, it gives confidence in the reliability and durability of the system.

When laying an electrical cable, it is necessary to think about its protection. Protection is required for outdoor communications, for wiring inside the building, for a cable passing underground. In the latter case the best solution There will be hollow pipes from low pressure polyethylene (hereinafter referred to as PND).

PND pipes are produced in the factory conditions in the method of extrusion. Standard pipe consists of homogeneous plastic with smooth surface. Product color - black. Of the mandatory requirements for PND pipes, the following are distinguished:

  • The pipe material is a dielectric (does not require grounding).
  • The product has good strength.
  • It has resistance to the devastating effects of many chemical compounds.

The technology of manufacturing PND pipes is regulated by GOST 16338 and 16337. Standards describe in detail appearance Products - without blooms, cracks, influx and other defects. The pipe cannot be smeared, with its inner surface must be as smooth as possible. More a budget option - Pipes from secondary raw materials (blend of waste production and polyethylene additives). Their production technology does not make such strict requirements, however, the life of such products will be much less.

Other operational characteristics:

  • The operating pressure indicator is determined by the type of pipe and can be from 0.25 MPa for light varieties up to 1 MPa for heavy.
  • The service life is about 50 years, subject to normal working conditions.
  • Temperature range from -25 to 70 ° C.
  • PND pipes are environmentally friendly, do not distinguish harmful substances.
  • Pipes are easily bent without loss of operational qualities.
  • They have high elasticity, capable of restoring linear size.
  • Products have low weight, especially in comparison with metal counterparts.

It is important! PND tube can not be bend too much. This can lead to the formation of fuses, stretch the cable through which will be very problematic.

PND application for cable laying in Earth

The gasket of electrical communications under the ground is justified primarily in the regions with frequent manifestations of adverse weather conditions: strong gusts of wind, thunderstorms, etc. In the cold season, the underground gasket will help protect the cable from icing and a possible impulse.

For the cable is a unconditional leader in the protection of power wiring, communication communications and optical cable. Properties such as the smoothness of the inner walls, flexibility and a large operational period make the PND tube with the optimal solution in any large projects.

PNDE technical pipe for cable. The optimum ratio of price and quality.

PND technical pipes carry exclusively protective functions without special design loads. Therefore, their production is cheaper as much as possible due to the use of secondary raw materials. However, this is completely not reflected on the quality: PND technical pipe for cable has proven its excellent reliability with decades of the trouble-free service. Modern technologies Provide the stability of the profile geometry throughout the pipe, the homogeneity of the thickness and density of the walls. The price of technical PND tube is inexpensive for analogues from other materials.

Smooth pipe TECHNICAL PND for cable - broach without obstacles.

The Material of the PND is initially posing very useful for laying cable with quality - smoothness. Due to the specific surface effect of smoothness on the walls, the cable easily slides along the inner cavity of the pipe. No less convenience during the cable broke is ensured by the lack of joints on the site up to two hundred meters due to the longness of the pipe. In fact, when the smooth technical PND tube is used to protect the cable, any mechanical barrier is excluded when carrying out wires.

PND pipes technical for cable laying in buildings and soil.

The PND tube has an average resistance to ultraviolet, which limits its outdoor use. To increase the stability, a black pigment is added, which extends the service life in the open space. But it is ideal for cable wiring indoors and closed soil. The PND tube is used in trench laying and styling the trenchless method of puncture of the soil. As a protective cable shell, it is placed in monoliths when building buildings and structures. PND technical pipes for cable laying are withstanding various manifestations of static and dynamic loads in a wide range, temperature fluctuations, the effects of most acids, alkalis, organic compounds.

PNDTE TECHNICAL REPUBLIC UNDER CONCLUSION.

The dielectric properties of low pressure polyethylene are used for the manufacture of electrical protective housings. The PND tube technical under the cable is used when laying a low and high voltage power supply wire. The electrical strength of the PND is comparable with mica performance, the best of natural dielectrics. Additional protection for the case of a cable isolation isolation provides fire resistance of an electrical pipe.

Technical polyethylene PND tubes for gas cable laying.

There are special technical conditions on the laying of communication lines, including optical lines. They provide for use technical pipes PND. Simplicity of installation, the possibility of hermetic docking, low cost, physicochemical properties, durability at least half a century determine the advantage of technical polyethylene pipe PND for cable laying when choosing a protective shell of communication lines.

The main technical characteristics of the PND tube for cable laying.

The main technical characteristics of the PND pipe for cable laying are the parameters that lock the overall dimensions, physical, chemical and operational properties.

Based on the outer diameter and wall thickness, the SDR coefficient is displayed, which determines the type of pipe - light, middle, medium, heavy.

Important control indicators - the density and degree of tension during tension determine the flexibility and elasticity of the pipe. The thermal conductivity of the material is directly related to the combustibility class. For technical project, it is a class B1 or B2 (hard-coherent and normally marked).

Resistance to aggressive media, low specific gravity, wide temperature range, ease of installation and operating duration determined the popularity of the PND pipe for electrical work. Our company sells any batch of pipes in Moscow and in the regions. In the catalog of our organization pipe PND different types, diameters and lengths. Wholesale deliveries and retail sale are possible.

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The cable gasket in the ground is a fairly popular way of mounting lines, despite the high costs. Air lines are constantly exposed to different natural factors, especially suffer from strong winds and icing. Repair work On the lines lead to serious costs, and the damage from idle enterprises remaining without electricity can be calculated by fantastic sums. The trench gasket also has its own nuances, requires attracting earthmoving equipment and additional protection against accidental damage. Today, pipes are increasingly used for cable laying in Earth, protecting from the effects of rodents, high humidity, mechanical impact. The use of pipes is regulated by SNIPM and GOST, for each type of cable, these products are recommended. So, it is impossible to use for laying power cable steel tubesAnd for the control cable they are quite suitable.

Spectrum of pipes used for cable laying

For a long time, only steel and asbated pipes were used to protect the cable laid in the cable. The disadvantage of the first of these was the lack of protection when sampling the cable. Asbic cement pipes are heavy, fragile and contain far from the most secure mineral - asbestos. That is why with the appearance plastic pipes They became the main material used when laying the cable. Among their advantages:

  • small weight;
  • high strength and durability;
  • good insulating properties;
  • not subject to corrosion and rotting.

Currently, pipes for laying cable in the ground are made of high or low pressure polyethylene, polypropylene and PVC. All these materials have excellent performance. The use of pipes with different wall thickness, smooth or corrugated allows you to choose the optimal material to each specific cable type. The high popularity of the PND pipes are used to lay the cable in the ground, they are produced by the following types:

  • light corrugated;
  • heavy corrugated;
  • halogen;
  • smooth-suited hard;
  • double-colored.

Corrugated pipes for cable laying in the ground can be reinforced with steel wire to give them additional strength.

Two-wall pipes: a combination of practicality and ease of installation

In recent years, such products have proven its effectiveness as for cable laying in Earth. This system consists of a corrugated shell made of low pressure polyethylene and a smooth inner shell produced from high pressure polyethylene. The pipe is characterized by high annular rigidity, which allows it to withstand significant loads. The smooth inner wall makes the cable mounting as simple as possible, increasing the pace of work. Despite its two-layer structure, the pipe corrugated 2-wall for laying the cable in the ground has a small weight, which significantly simplifies its transportation and laying into the trench. Installation of the pipe of this type can be carried out in a wide range of temperatures, allowing you to work even in winter frosts. The two-layer tube has high resistance to ultraviolet, aggressive chemicals, which expands its spheres of use, simplifies storage. For the connection, simple coupling without fubs are used, which makes the installation easier, cheap and reliable. The life of corrugated two-layer pipes is at least 50 years old, but in practice it is much larger.

To protect the lines of communications and links when laying wires is most often used for cable in the ground. Its use as a protective shell makes it possible to eliminate the risk of damage to products during the arrangement of highways and during their operation.

Low pressure is able to protect the wires (including power cable) from the effects of soil, mechanical shocks, as well as wandering currents. What exactly are used to protect engineering networks and how to choose suitable, read further.

Causes of high popularity products

The most popular method of arranging electrical, communication, signal and other networks is considered to be a cable laying underground. And most often it is in the PND tube. Therefore, manufacturers seek to make the most diverse assortment of produced polyethylene products special purpose. Despite the fact that such a method of laying cables and wires is quite expensive, it is considered very popular.

For cable laying in Earth, it allows you to prevent a variety of problems that are possible during the operation of engineering networks.

The reasons for the growing popularity of these collectors during the arrangement of underground highways are:

  1. Reducing the risk of damage to the lines by external factors (for example, in adverse weather conditions).
  2. Protection against vandals and frost.
  3. The fire is excluded due to short circuit.

What varieties of products can be used to protect wires?

In the building materials market, you can find all sorts of products that are suitable for laying engineering highways in the ground. It may be not only PND collectors, but also pVC pipes, asbestos or asbestos-cement, steel. However, most often it is polyethylene materials that are used to protect wire and power lines under the ground.

PND pipes (cable pipe in the ground) are several types:

  1. or heavy
  2. Hard with a smooth shell
  3. (with 2 walls)
  4. Halogen.

The main types of pipes that can be applied in the ground.

Collectors representing one or another type are intended for certain purposes. For example, it can be used for underground wiring products with double walls, one of which is a corrugation, and the second - PVD shell. Corrugated pipe for cable laying in the ground is not suitable. Even despite the fact that it is characterized by increased elasticity and durability.

To understand what these or other materials are used, it is possible on the marking applied to the product. It indicates (GOST, diameter and shell thickness, strength, rated pressure indicator, product class and sometimes its purpose).

If you need a PND pipe for the cable under the ground, consider the purpose of its further use and specifications. So, the material in the corrugation is suitable for hidden electrical storage rooms. Usually it is the highways that are created when arranged houses and come into a wall or ceiling. The most durable collectors of DSC corrugated can even be used in the construction of an engineering network in the floor (under the fill with concrete or cement).

Depending on the number of cables in the intended network, the pipe can be of different diameters. For example, if 2-3 wires are carried out with a cross section of 95 mm², a product with an internal Du is 63 mm can be used. They are implemented by bays of 15 m or separate cuts.

If it is necessary to carry out a line of 2-5 cables with a cross section of 25 mm² each, you can apply collectors with an inner hole at 32, 40 or 50 mm, etc. Some manufacturers offer on sale Pest collectors with large diameter in the range of 160 mm-250 mm. Such materials are implemented by segments of 12 m or coils of 100m (200m).

Methods and features of laying

Bookmark cables in pipes can be carried out by terrestrial or underground method. Also practiced laying of cables in the shell in the premises. If you need to equip an electrical or communication system in a residential building, you should familiarize yourself with the peculiarities of the process. First of all, it is recommended to lay networks at temperatures up to -30 ° C.

It is necessary to ensure the tightness of all the joints and nodes on the line to eliminate the risk of moisture, other contaminants inside the collector. If the operating conditions of the network assume the formation of condensate in the pipe, additionally, boil the length for collecting unnecessary fluid.

Making sure that such moments are taken into account, you can proceed to the next stage of work. The cable laying in the ground in the PND pipe is not too time-consuming process, the main part of which occupies trenching. After preparing the deepening of the desired value, the collecto is first paved, and then the cable is turned into it. By examining the lines for the absence of damage and depressurization of nodes, the developers fall asleep with sand and ground design. Installation of the signal tape can be labeled around the entire perimeter.

Valuable product quality

The PND tube intended for the cable and its protection in the ground (the price of them is relatively low, if you take a long service life), it has a huge number of valuable qualities:

  • easy and, as well as a simple cable using a probe;
  • the ability to underground wiring with large radial corners;
  • stability K. different conditions operation (from mechanical effects to temperature differences);
  • possibility of operation of 50 or more years;
  • low weight;
  • use without additional grounding, etc.

As you can see, the use of PND pipes when laying engineering underground highways is the key to their successful and reliable operation. Therefore, it is important to choose the right collector and take into account all the nuances of its use.

The video demonstrates testing of corrugations for the PVC electrical wiring and HDPE to fire:

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