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Laying cables in the ground in pipes: basic rules of work. Which pipe is best for laying cables in the ground - an overview of the advantages of different types of pipes HDPE pipe for cable

equipping country cottage area, the owners must solve many operational issues associated with the new building. To live comfortably in country house, you will need to think over high-quality water supply, sewerage, and electricity systems. Laying cables in the ground in pipes is necessary to provide power lighting fixtures, heaters and other household appliances. To do this work yourself, you need to study the technology of its implementation. This will create a high-quality and durable system.

General requirements for work

Not every owner of the site is satisfied with the air conduction of the cable system to the house. The underground version of laying power communications is gaining more and more momentum. They enter the house through the basement. Therefore, this type of work is carried out even at the stage of laying the foundation.

A plan for such electrification is developed even before construction begins. All cable branches are thought out. At this stage, the condition of the soil, the type of climate zone and other aspects of the safety of the system operation are taken into account.

The laying of cables in the ground in pipes must be carried out taking into account existing requirements and rules. When carrying out such work, it is necessary to take into account the norms of SNiP and PUE, as well as GOST. Performing all necessary installation operations, be sure to comply with labor safety rules.

Types of materials

Laying cables in the ground in pipes (PUE, SNiP clearly regulate this process) requires a choice the right materials. First of all, they must be safe. But the cost must also be acceptable. Today there are communications that do not need to be carried through pipes. These are armored cables. However, their cost is very high. Therefore, the trench installation method involves the use of cheaper cable in special pipes.

The cable that runs underground must be marked with SIP. This variety allows you to apply all existing standards. However, it must be mounted in a trench way in a pipe. The track can be metal or plastic.

Made from plastic. They are quite durable and have a smooth surface. Corrugated pipe type DKC can only be used for interior work, for conducting communications under a layer of plaster.

Advantages of the method

Laying cables in the ground in HDPE pipes, metal or metal-plastic varieties has a number of advantages. This allows you to protect the wire from adverse weather conditions, mechanical damage.

If you need to replace the conductor one day, you can easily get the old cable and run a new one along the existing route. This technique allows you to comply with fire safety rules. This is especially important in wooden houses. A pipe designed for trench installation prevents sparks and overheating of surrounding materials.

The advantage of such a system is the additional protection of the cable. Thanks to the pipe, rodents and microorganisms will not damage it. If the conductor is laid in the ground without such protection, moles can gnaw through it.

Trench construction

Laying cables in the ground in pipes (photo below) must meet a number of mandatory requirements. The depth of the conductor in the ground must be at least 70 cm. This indicator varies depending on the climatic zone.

You can not run the track under the foundation. From it, the cable must pass no closer than 60 cm. The width of the ditch is selected in accordance with the number of conductors passing along the route. They should be located no closer than 10 cm from each other.

The trench is covered with sand and compacted to a level of 15 cm. Before arranging the route, it is necessary to consider the site plan. It is not allowed that pipes with electrical conductors pass closer than 1 m from gas or 2 m from water communications.

If a brick is used to strengthen the transmission line (with significant ground subsidence), it should not be hollow. It is necessary to lay a tape over the route with an inscription about the passage of a power cable here. Then a layer of sand and earth with a slide is again filled up.

Features of laying in plastic pipes

Laying cables in the ground in HDPE pipes has a number of features. They must be studied before work is carried out. First you need to draw a route. Pipe fastening must be done every 60-80 cm. For this, special brackets or clips are used.

To pull the cable through the pipe, use special broaches or metal wire. All elements of the route are connected using a special soldering iron. The cable inside should be connected using special couplings.

If the track has a vertical layout, it is made with a slope. So it will not collect condensate.

Features of laying in metal pipes

If you need to pull the conductor into a wooden building, a bath, then it is better to give preference to This is a strong product. It can be galvanized or iron.

It should be noted that laying cables in the ground in DKC pipes is not allowed. They are used exclusively for laying cables indoors. To connect the metal elements of the route, you can use welding or threaded fittings.

When arranging such a system, it is necessary to perform grounding. The slope must be towards the side Pipes and joints must be painted to prevent corrosion. It is better not to use such structures for internal work. When the floor is poured with concrete, the painted surfaces will not adhere well to it.

Connection rules

Cable laying in pipes in the ground, the norms of which regulate the PUE and GOST, must be carried out responsibly. Pipe connections are not allowed. This is done only in the most extreme cases and at the same time special couplings are used.

It is better that such field connections are made in junction boxes. This is required

The track must not be bent at an angle greater than 90 degrees. Otherwise, the replacement of the old conductor will not be possible. Pipe joints must be additionally sealed. The entry must be sealed.

The wire size must be selected according to the load of the system. It is better to give preference to a copper cable. Aluminum conductors are applicable only for internal work.

Proper laying of cables in the ground in pipes is quite simple on your own. However, the advice of experts should be taken into account. They recommend using a route that is 3 times as wide as the conductor itself.

If the winters in this climatic zone are very severe, the ground can freeze by more than 70 cm. To prevent the pipes from deforming, they should be carefully fixed. But it is better if the track goes even deeper.

When developing the plan, avoid trenching under car park areas, playgrounds, or garden paths.

Having become familiar with such technology as laying cables in the ground in pipes, you can do this work yourself. Observing all safety requirements, you can create a high-quality, durable track. Its operation will be safe.

For cable, it is the undisputed leader in the field of protection of power wiring, communication communications and optical cable. Properties such as the smoothness of the inner walls, flexibility and long service life make the HDPE pipe optimal solution in any large projects.

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

HDPE technical pipes carry exclusively protective functions without any special structural loads. Therefore, their production is as cheap as possible due to the use of secondary raw materials. However, this does not affect the quality at all: the HDPE technical pipe for cable has proven its excellent reliability for decades of trouble-free service. Modern technologies ensure the stability of the profile geometry throughout the pipe, the uniformity of the thickness and density of the walls. The price of a technical HDPE pipe is unattainable for analogues from other materials.

Smooth pipe technical PND for a cable - broach without obstacles.

HDPE material initially has a very useful quality for cable laying - 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 when pulling the cable is provided by the absence of joints in a section of up to two hundred meters due to the length of the pipe. In fact, when applied to cable protection, smooth technical HDPE pipe, any mechanical obstruction is excluded when pulling wires.

HDPE technical pipes for cable laying in buildings and soil.

The HDPE pipe has an average resistance to ultraviolet radiation, which limits its outdoor use. To increase stability, a black pigment is added to the composition, which prolongs service life in open space. But it is ideal for cabling indoors and in closed ground. The HDPE pipe is used for trench laying and laying by the trenchless method of puncturing the soil. As a protective sheath of the cable, it is laid in monoliths during the construction of buildings and structures. Technical HDPE pipes for cable laying withstand various manifestations of static and dynamic loads in a wide range, temperature fluctuations, exposure to most acids, alkalis, organic compounds.

Pipe PND technical under a cable of an electrical wiring.

Dielectric properties of polyethylene low pressure used for the manufacture of electrical protective casings. The HDPE technical pipe for the cable is used when laying power wires with low and high voltage. The electrical strength of HDPE is comparable to that of mica, the best of natural dielectrics. Additional protection in case of cable insulation breakdown is provided by the fire resistance of the electrical pipe.

Technical HDPE polyethylene pipes for laying communication cables.

There are special technical conditions for laying communication lines, including optical lines. They provide for the use technical pipes HDPE. Ease of installation, the possibility of hermetic docking, low cost, physical and chemical properties, durability for at least half a century determine the advantage of HDPE technical polyethylene pipe for cable laying when choosing a protective sheath for communication lines.

The main technical characteristics of the HDPE pipe for cable laying.

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

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

Important benchmarks - density and degree of tensile stress determine the flexibility and elasticity of the pipe. The thermal conductivity of the material is directly related to the flammability class. For a HDPE technical pipe, this is class B1 or B2 (slowly flammable and normally flammable).

Resistance to aggressive environments, low specific gravity, wide temperature range, ease of installation and long service life determined the popularity of HDPE pipes for electrical work. Our company sells any batches of pipes in Moscow and in the regions. In the catalog of our organization HDPE pipes different types, diameters and lengths. Wholesale and retail sales are possible.

And the electrical wiring inside the house requires additional insulation, which will protect the cable from external influences, and residents from electric shock in case of damage to its insulating layer. The HDPE pipe for the cable copes well with this task. In this article I will talk about the features of these products, existing varieties and different ways styling.

  1. Permissible working temperature- from -25 ºС to +70 ºС.
  2. Permissible installation temperature - not lower than -30 ºС.
  3. The density of polyethylene is 0.949–0.953 g/cm3.
  4. Flammability class - B1, B2.
  5. Nominal pressure depending on the type of pipes:
    light - 0.25 MPa;
    medium light - 0.4 MPa;
    medium - 0.6 MPa;
    heavy - 1 MPa.
  6. Thermal expansion coefficient - 0.15–0.2 mm/mºK.
  7. Brittleness temperature - from -70 ºС.

Applications

HDPE pipes are used as protective sleeves for cables laid in an open, hidden and semi-hidden way when installing:

  • power supply networks;
  • telephone lines;
  • telecommunications;
  • video surveillance;
  • computer networks;
  • fire, control, alarm.

Reasons for high popularity

When performing electrical work, HDPE pipe is very popular for a number of reasons:

  1. It provides reliable cable protection, virtually eliminating the risk of electric shock in the event of damage to the cable insulation.
  2. It has a special design that facilitates the pulling of cables of all types.
  3. Pipe products made of HDPE, unlike metal boxes, are more convenient to transport and are absolutely not subject to corrosion.
  4. Does not conduct electricity, therefore, does not require additional costs for cathodic protection.

Life time

The service life of HDPE pipes for cable is at least 50 years.

Requirements and standards

Requirements to technical specifications cable channels from HDPE pipes are regulated by GOST 32126.1–2013. Recycled material grades must comply with:

  1. GOST 16338-85. The standard applies to low-density polyethylene of the following grades: 271, 273, 276, 277, 286.
  2. GOST 16337-85. Defines technical requirements to polyethylene high pressure stamps 10803-020, 15303-003, 15803-020, 16803-170.

The outer surface of the HDPE technical pipe must be smooth, without noticeable delaminations, cracks, chips and bubbles. The internal surfaces of the products should not have bumps and protrusions that prevent the wire from being drawn.

Polyethylene pipes are sold in lengths of 5–12 meters or in coils of 25, 50, 100, 200 meters.

Marking

The marking is applied by the manufacturer on the outside of the HDPE pipe along the entire length in increments of 1 meter. It consists of the following symbols:

  • manufacturer's name (trademark);
  • grades of polyethylene (for example, PE-63, PE-80);
  • SDR indicator (ratio of the outer diameter of the product to the wall thickness). It determines the level of ring strength;
  • geometric parameters: diameter and wall thickness;
  • production standard (GOST or TU);
  • purpose of the product (technical, drinking, gas or sewer);
  • production dates.

I give an example of a typical marking: PE63 SDR 11 - 40 * 2 technical GOST 16338-85.

Classification of HDPE pipes for cable laying

Manufacturers offer HDPE pipe for installation of cable channels in two versions:

  • smooth;

These types of pipe products differ in technical characteristics and are used for operation in different conditions.

Smooth

Smooth HDPE pipes - black, rigid, have high mechanical strength. They are:

  1. Non-reinforced with a single-layer wall construction. Used for cable routing brick walls, concrete structures, floor screeds.
  2. Double layer reinforced. They are used for operation in more difficult conditions.

For turns, transitions in cable channels made of smooth HDPE pipes, special fittings are used.

Corrugated

Polyethylene corrugated pipes are used for both surface and underground utilities. They have a two-layer wall, in which the inner layer is smooth, made of PVD, and the outer corrugated layer is made of HDPE. Can be supplied with or without probe installed inside.

According to the ability to withstand external pressure are divided into:

  • easy;
  • average;
  • heavy look.

Depending on the purpose, they are painted in different colors:

  • red - for high voltage lines;
  • blue - for laying communication lines and telecommunications;
  • black - general purpose products.

HDPE corrugated pipes are characterized by excellent flexibility, withstand heavy loads, therefore they can be used for laying curved highways and placed at different depths.

Advantages and disadvantages

HDPE pipes for cable protection have the following advantages:

  1. Light weight compared to metal hoses.
  2. Good electrical insulating properties.
  3. Chemical resistance.
  4. High degree of wear resistance.
  5. The ability to endure prolonged contact with an aggressive environment.
  6. Low thermal conductivity, due to which condensation does not form.
  7. Frost resistance. Pipes do not collapse when water freezes in them.
  8. Affordable price. For electrical work, a pipe made from recycled materials is used, the cost of which is 30-50% lower than products made from primary polymer granules.
  9. Elasticity. It can be bent to difficult areas without using molded parts.
  10. The smoothness of the inner walls, making it easy to pull the cable through.
  11. Sufficient rigidity.
  12. bacteriological resistance.
  13. Resistance to mechanical damage and vibration loads.
  14. Small coefficient of linear expansion.
  15. Resistance to temperature changes.

The disadvantages include the ability of HDPE pipes to support and propagate combustion. Therefore, they must be embedded inside fire-resistant materials, such as concrete screed, cement mortar, or laid in the ground.

The following indicators should be the determining factors when choosing HDPE pipes for cable:

  1. throughput. The inner diameter of the pipe must correspond in size to the total cross-sectional area of ​​the cables that are supposed to be inserted into its cavity. The range of polyethylene pipe products includes products with a diameter of 16 to 225 mm and a wall thickness of 2 to 30 mm. If you need to stretch 2 wires with a cross-sectional area of ​​​​5 mm² each, then a pipe with an inner diameter of 20 mm will do. For 3 cables with a total cross section of 24 mm² optimal diameter will be 30 mm.
  2. Strength characteristics. To assess the level of strength of the product, the SDR value in the marking is taken. The lower it is, the stronger the pipe and can withstand heavy loads.

Methods and rules for laying HDPE pipes

The technology of laying protective sleeves from HDPE pipes has features depending on the location of the cable and its operating conditions.

The general rules for all laying methods are as follows:

  1. It is not recommended to lay cables of different networks in the cavity of one protective channel.
  2. , this can lead to the formation of a crease.
  3. Pipe joints must be sealed. Individual products can be connected using compression couplings, press fittings or by butt welding.
  4. The length of the section between the boxes should not exceed 25 meters.
  5. For open laying outside the building, black HDPE corrugation, resistant to UV radiation, should be used.
  6. To ensure the outflow of condensate formed on the outer surfaces, the pipelines must have a slope directed towards the pull boxes. They will collect moisture.
  7. When the channel is deepened into the soil by more than 2 meters, it is necessary to carry out a protective concrete screed 8–10 cm thick.

Laying pipes inside buildings

Installation of cable channels inside buildings is carried out in the following order:

  1. Cable routing markings.
  2. Punching a strobe in the building envelope (if necessary).
  3. Connection of individual HDPE pipes into the pipeline and their fixation. For fastening products to walls or ceilings, special holders with a latch are used, to the floor - metal brackets.
  4. Termination of the structure depending on the location of the channel and its diameter. For embedding in the walls use plaster or other Decoration Materials. Pipelines laid in the floor are poured with concrete.
  5. Cable pull. The wire inside the plastic pipeline must be located freely, without tension.

Laying outdoors in a trench

In many cases, underground laying of electrical cable is preferable to air routes. In the ground, it will be protected from precipitation, icing and gusts of wind, inaccessible to non-ferrous metal thieves.

The process of laying HDPE pipes for cable in the ground consists of the following steps:

  • marking the dimensions of the trench;
  • trench excavation and bottom leveling;
  • laying pipes along the trench;
  • backfilling with sand or soft soil of the base of the ditch by 10 cm;
  • sequential laying of pipe sections with sealing of joints by contact welding;
  • checking the integrity of the cable sheath and pulling it into the pipe cavity without tension;
  • backfilling with soft soil or sand of the finished pipeline with a layer thickness of 10–15 cm;
  • backfilling the trench with soil.

So that in the future the laid route can be found, signal posts are placed above it. When installing the cable underground to connect parts polyethylene pipeline fittings must not be used. They can break its tightness.

Trenchless method of laying in the ground

In cramped conditions of private yards or cottages, where it is not possible to dig a trench, the method of trenchless cable laying is used. To do this, use special equipment that allows you to drill the soil in a horizontal direction. Before starting work, you need to issue a drilling permit and perform an analysis of the geological composition of the soil.

Cable laying in a trenchless way is carried out in the following sequence:

  1. Drilling a pilot well. It is carried out using a special tip attached to a flexible rod. It allows you to change direction when it encounters natural obstacles in the ground. The tip is equipped with special cooling holes and navigation apparatus. This allows you to control the drilling trajectory and correct its direction.
  2. Expansion of the well to the desired size. At this stage, the tip is replaced with an expander, which makes it possible to increase the well diameter to the design parameters;
  3. Pipe laying. First, the cable must be inserted into the pipeline, and then assembled structure fasten to a special rod of the HDD installation, which will stretch it through the well. To reduce the friction force during the passage of the communication whip through the horizontal channel, a drilling fluid is used.

Cable laying in the ground necessary for communication equipment for various purposes. AT industrial scale hundreds of meters of wires are pulled under roads, within the city, at facilities under construction and other sites that need electricity. Also, cable laying in the ground is often carried out at home, in the country or personal plot. Underground laying, especially when there is a lot of wiring, can be a serious problem if you do not own the technology. Fortunately, many methods are known and tested today, one of them is the use of a technical pipe as a case.

Advantages of a HDPE pipe

A pipe made of low-pressure polyethylene or HDPE for short is characterized by low weight, good flexibility and durability. It is smooth, black in color with small patches. The production of such a pipe is based on the principles of processing secondary raw materials. It can be packaging film, plastic bags, bottles and other polyethylene products. Granules are obtained from them, small particles of the same size.

Such raw materials are easily processed. Getting into the extruder, the granules are heated and pulled to the desired shape. Diameter, wall thickness are selected in advance, a line is adjusted for them. Finished pipes are cooled and distributed in batches. Standard sizes up to 75 inclusive are wound into coils, the rest in lengths of 12 meters.

Why choose HDPE pipe

Low price

Fast transportation

Easy installation

Storage HDPE pipes before laying does not require serious investments. It is enough to find a place hidden from the sun's rays, since the polyethylene becomes soft in the heat. As installers say, the wall begins to float. As a result, instead of the prescribed, for example, 20-23 millimeters, you will get a pipe with a passage of 25, or even all 30 millimeters. Therefore, it is better not to take risks, and choose a room in advance.

Stages of ground cable laying

First of all, you need to carefully inspect the wires. They must be intact, without dents or other visible defects. Otherwise, your efforts will be in vain. Damaged communications will not be saved by any shell.

After checking, they start marking the site, then dig a trench. It should not contain large stones, debris, glass and other foreign objects. It is advisable to cover the base with a layer of sand 5 or 10 centimeters. A pipe is placed in the prepared niche and a broach is performed. This is most qualitatively obtained with specialized channel harvesting devices.

However, it is difficult for ordinary craftsmen to get these devices, especially with a volume of more than 100 meters. A variety of things are used, from fishing line, baby rattle and vacuum cleaner to fittings and liquid soap.

When there are few wires, and they are arranged in a straight line, as in the video, it would be more rational to cut the pipe and manually push the cable. For longer lengths, it is recommended to use nylon threads, metal wire. They are lowered inside and pulled along with the wiring.

Experts advise not to take couplings and other fittings for the installation of power networks, but to make the communication integral. Connections may compromise sealing. This statement is true for open areas. When bringing the network into the room, connecting parts are indispensable.

At the end, the pipe is covered with sand and soil by 15 centimeters. It is also necessary to designate a place. This is where warning tape comes in handy.

Trenchless cable laying

Horizontal drilling technology is designed for installation of cable structures in hard-to-reach places. It is mainly used by public utilities. The bottom line is a gentle effect that does not violate the surface layers of the soil. First, they study its composition and obtain a work permit, then adhere to the following scheme

1. Drilling a primary well

2. A head with a built-in bevel and feed holes fills the space with a special solution that prevents soil collapses

3. Rimmer increases the passage of the well

4. The drilling rig tightens the HDPE pipe.

The process is not fast and rather costly in terms of equipment. Nevertheless, HDD remains one of the highest quality underground cable laying methods. The main thing is to turn to professionals and do not forget about control.

The considered methods are considered the most effective and guarantee the safety of the cable. The system will function for the entire warranty period. Of course, special attention should be paid to the preparation and observance of the sequence of actions.

Work on laying communications is always associated with the risk of their subsequent damage. In other words, the wiring can be damaged by both the soil itself and the builders, if the work is done inaccurately. As a warning of such cases, a special HDPE pipe for the cable was created, which is designed to protect it and protect people from electric shock.

The first and most basic feature is that electrical equipment is made of dielectric materials. That is, it serves as an additional protective layer, which is designed to protect others and the cable itself from dangerous, extraneous influences.

Also, the design of the product allows you to protect the cable from mechanical damage during operation. Which guarantees an increase in the period of use.

In addition, it is worth noting that for different types of installation, different products are used in design. So, for example, when pulling power cables through the air, a corrugated type HDPE pipe is used, without additional reinforcement and reinforcement - this makes it possible to minimize the weight of the structure and reduce the load on the suspension elements. The main purpose of such protections is to minimize the ultraviolet flux, which can destroy the insulating layer.

For underground laying communications, high-strength HDPE pipes are used, often with additional reinforcement. This is necessary to effectively withstand ground pressure and other factors, for example, the carelessness of builders (often, cables are touched by bulldozer buckets during earthworks).

Benefits of using HDPE pipes

The pipe for the cable made of low pressure polyethylene has a number of features, due to which its use is optimal for various laying methods. Below is a list of the main benefits.

  • Low cost - this type is much cheaper than traditional materials.
  • The low weight of HDPE products is much less than metal ones.
  • Long service life - more than 50 years.
  • High flexibility. The materials used are increased resistance when bending, however, we must not forget about the possibility of pulling the wires. If the bend is too strong, the wire cannot be mounted correctly.
  • Ensuring sufficient technical opening for the possibility of adding new wiring.
  • Ease of installation.
  • HDPE casings of relatively small diameter do not require soldering at the ends, which eliminates the need for complex equipment.
  • Not subject to corrosion, aging.
  • High resistance to significant temperature changes.

This is far from complete list significant advantages for the use of these materials.

Advantages of corrugated pipe

Is one of the most popular building materials facilitating communications.

As a means of increasing the reliability and comfort of installation, additional reinforcement with steel wire can be used - this gives it additional ring rigidity. The corrugation reinforced in this way can perfectly withstand the pressure of several meters of soil and perfectly withstand natural factors.

Also corrugated covers are double-walled. The inner surface is smooth and provides good sliding when pulling. The outer part is corrugated, which gives significant indicators of resistance to aggressive environments.

A special mention is worthy of the feature of corrugated products, to take any shape, as well as their good elasticity. For example, metal protection can rot and burst at the place of application of force, which will lead to the penetration of moisture to the wiring, but this one is not - it will simply bend, but the integrity will not be broken. Thanks to this, it is possible to lay non-linear channels, which is especially useful when space is limited or specific building conditions.

The most effective is the use on complex soils, such as rocky, seismic or mobile soils.

It should be noted and resistance to temperature extremes. The optimum temperature for installation is from -20 to + 70°C.

Types of technical HDPE pipes for cables

Laying of any engineering communications related to electrical wiring requires impeccable performance, strictly prescribed rules and regulations. Usually, the HDPE technical pipe for the cable is selected exclusively for certain operating conditions. Deviating from the requirements can be fraught with serious consequences.

Such main channels are divided into technical and electrical. These types differ in scope, purpose, as well as technical indicators.

Smooth technical HDPE pipes for cable

Smooth HDPE pipes for electrical work are manufactured using recycled materials, which significantly reduces production costs, as well as minimizes the harmful effects on environment. As a negative factor, this technology changes the characteristics and color of the final product, however, this does not significantly affect performance.

The scope of this type of pipe is quite specific - they are usually used for wiring communications along the walls or floors of rooms.

In practice, it looks something like this: HDPE smooth electrical pipe is mounted in a wall strobe or the base of a floor screed. Further, the ends of the highway are brought into place, after that, the strobe closes. Thus, a free channel for wires and communications is formed. The final stage is the pulling of the power cores, the excess edges are cut off, control plugs are installed, which serve to seal the leads.

Electrical pipes

The second common type is often used as an underground pipeline, laying power and communication cables. The main application lies in the use of cables up to 1 kW power.

The special, corrugated design allows the HDPE pipe to withstand heavy loads, which is an indispensable factor in such work.

Remarkably. Each shell has its own purpose - the outer one is a reinforced case and serves as a solid basis for maintaining the shape of the product. Inner part, created from a different type of material. It is smooth and acts as a sliding layer to facilitate wire pulling.

The design also implies separation into pipes with or without a probe. The probe itself is designed to facilitate the pulling of wires through the pipe, it usually looks like a steel vein to which the wire is attached. Then, by pulling the flock, it is replaced by a wire.

Important! Despite the significant resistance to mechanical stress, it is not recommended to lay the SIP wire in the HDPE pipe. This can cause a decrease in its useful life, as well as lead to an accident.

Technical parameters of pipes

In the manufacture of any type of sleeves, a prerequisite is the strict observance of all requirements and characteristics. These requirements are clearly articulated in specific documents. So, for example, GOST 16338 defines the requirements for the manufacture of low pressure with markings 271, 273, 276, 277, and 286. And GOST 16337 refers to products marked as - 10803-020, 15303-003, 15803-20, 16803-170 .

Additionally, the integrity of the layers, blisters, cracks or other material defects are not allowed.

Important! Roughness is not allowed on inner walls. It is also not permissible to violate the uniformity of the outer layer, both on corrugated and smooth HDPE pipes.

Assortment of HDPE technical pipes
SDR9 SDR11 SDR13.6 SDR17 SDR17.6 SDR21 SDR26
Outdoor Diameter Product wall thickness in mm
16 2,0
20 2,3 2,0
25 2,8 2,3 2,0
32 3,6 3 2,4 2
40 4,5 3,7 3 2,4 2
50 5,6 4,6 3,7 3 2,4 2
63 7,1 5,8 4,7 3,8 3,6 3 2,5
75 8,4 6,8 5,6 4,5 4,3 3,6 2,9
90 10,1 8,2 6,7 5,4 5,2 4,3 3,5
110 12,3 10 8,1 6,6 6,3 5,3 4,2
125 14 11,4 9,2 7,4 7,1 6 4,8
140 15,7 12,7 10,3 8,3 8,0 6,7 5,4
160 17,9 14,6 11,8 9,5 9,1 7,7 6,2
180 20,1 16,4 13,3 10,7 10,2 8,6 6,9
200 22,4 18,2 14,7 11,9 11,4 9,6 7,7
225 25,2 20,5 16,6 13,4 12,8 10,8 8,6
250 27,9 22,7 18,4 14,8 14,2 11,9 9,6
12,3 10 8,1 6,6 6,3 5,3 4,2

Also, additionally, PE pipes are divided according to the nominal pressure.

  • Light electrical - 0.25 MPa.
  • Medium light - 0.4 MPa.
  • Average - 0.6 MPa.
  • Heavy - 1 MPa.

Devices of a non-standard type are made individually according to the requirements of the customer.

Marking pipes for laying electrical cables

Manufacturers carefully monitor the need for marking. Such designations make it possible to clearly identify belonging to any type of work, and also indicates technical characteristics.

The first and important difference is the absence of a special colored strip along the entire length. Typically, such markings are applied only to plumbing and. In addition, a quality mark and a manufacturer's identifier must be applied, by which it is possible to determine who and when released the product.

There are also weight markings that are comparable to their strength.

  • T - heavy;
  • ST - moderate;
  • OS - medium light;
  • SL - medium light;
  • L - lungs.

Next, the number of the generally accepted standard is applied, it is indicated transverse section, thickness, number of wall layers and nominal pressure.

Usually, an electrical pipe HDPE PE for laying cables of types PE 63, 80 and 100 is marked as MRS6.3 and 8, 10.

How to choose pipes for cable laying

In order to choose the right HDPE pipes for electrical wiring, it is necessary to take into account the generally accepted values, as well as the number of wires laid in them. To accurately determine the diameter of a HDPE technical pipe for a cable of different sections, use the table:

Calculation of the number of cables in a pipe
Wire section (sq.mm) HDPE hose diameter - mm. The number of cables to pass through - pieces.
95 and over 63/63 3/2
70 63/53/63 3/2/4
50 50/50/63/63 3/2/5/4
35 50/40/63/50 3/2/5/4
25 40/32/50/50 3/2/5/4
16 32/32/40/40 3/2/5/4
10 32/25/40/32 3/2/5/4
6 25/20/32/32 3/2/5/4
4 20/20/25/25 3/2/5/4
2,5 16/16/25/20 3/2/5/4
1,5 16/16/20/20 3/2/5/4

Thus, it must be understood that the flow area of ​​the sleeve increases from the number of proposed cores.

Methods and rules for laying HDPE pipes

Depending on the location, the methods and rules for laying low-pressure plastic sleeves are radically different. Therefore, it is necessary to consider each type separately.

Laying pipes inside buildings

At the stage of rough work, the wall is ditched and pipes are placed in it for pulling

Usually, when installing hidden wiring, it is taken for a cable smooth or corrugated pipe- this is not prohibited by technical standards or GOSTs.

At wall mounting, it is most convenient to use smooth pipes, for the sexual - corrugated.

The principle and sequence of actions is given below.

  • The required location is marked.
  • Fixation is carried out, in the wall with clamps, in the floor - with metal brackets.
  • The wire is pulled using a special probe or.
  • Next, a floor screed is poured or a strobe is closed in the wall.

Important! When mounting the wiring, stretching the cables is not allowed, you need to give a little slack to allow for shrinkage.

Ways of laying in the ground

The technology of underground laying of HDPE pipelines is very relevant in modern realities. This method allows you to securely cover the veins and provide a neat appearance of the building.

Separately, for laying the cable in the ground, the methods disclosed below are used.

Trenchless method of laying in the ground

This type requires special attention and painstaking work from builders. Due to the extreme complexity of the process, it is used extremely rarely, only when absolutely necessary.

The essence of the method is to drill a horizontal well through which communications will then be installed.

Before performing work, a special permit is obtained, the composition of the soil is analyzed.

Thus, in order to place a cable in a pipe underground, it is necessary to perform a number of mandatory steps. The principal operation sequence is shown below.

  • A pilot well is being drilled. This is done with a thin drill to outline the main trajectory.
  • The pilot hole is expanded to the required diameter.
  • A PE sleeve is pulled into the passage.
  • The cable is installed.

The main disadvantage of the technology is the significant labor intensity and complexity of the process.

Laying outdoors in a trench

cable layer

Laying electrical cables in a trench is the simplest in terms of technical feasibility. After selecting the necessary wiring and pipes for laying the HDPE pipeline underground, the following sequence of actions is performed.

  • Area marking is in progress.
  • A trench of suitable size is dug.
  • Covers are being installed.
  • A wire is stretched along the sleeve.
  • Next, a sandy layer is applied, about 15 - 20 cm thick.
  • The trench is completely covered.

Important! Immediately before installation, the wires must be carefully examined for violations of the integrity of the insulation.

Cable installation under the road

When we are talking about installation under a road section, it is necessary to coordinate the actions with local authorities.

There are two methods for this operation.

  • Trenchless method.
  • trench method.

The first type is described above, so do not go deep.

Regarding the second type, there are several specific requirements, which are discussed below.

  • The depth of the trench should not be less than 1 meter. This is due to the large load on the ground.
  • Mandatory placement of pointing elements to prevent accidental breakage.
  • The cores are located at a distance of at least 10 cm from each other.

The subtleties of laying technical pipes

Depending on the individual characteristics of the method of laying a polyethylene pipe. There are several subtleties that you need to know in advance.

  • Installation work can be carried out at temperatures up to -25℃.
  • With the trench method, if the depth of occurrence exceeds 2 meters, additional protection is provided in the form of a horizontal shaft, which is created from concrete or brick.
  • Concreting of horizontal wiring is allowed.
  • Mandatory sealing of connections underground.
  • In cases of presumed formation of condensate, measures are provided for its removal.

Outcome

Using quality materials, you can significantly extend the life of communications. The use of a HDPE profile for this type of work significantly reduces the cost of resources and time for their maintenance, and also guarantees safety for others.

The video is simple and original way pulling the cable into the pipe with a vacuum cleaner.