Which pipe for laying cables in the ground is best suited - an overview of the advantages of different types of pipes. HDPE pipes for cable Corrugated pipe for laying in the ground

25.11.2019

HDPE pipes are designed to protect the power cable from external negative factors (mechanical, organic and chemical), as well as the effects of stray currents. Depending on the purpose of communication networks, the technology for laying them is different.

For the installation of power lines in the ground, protective cases are used that have high strength, elasticity and the ability to self-heal their original dimensions - corrugated HDPE pipes.

Article content

Types and characteristics

Thanks to, power communication (engineering) lines can be reliably and inexpensively laid underground in any corner of the city, as well as a private house or a summer cottage.

In addition, laying the wire through a protective elastic pipe exactly underground will protect it much better from mechanical, chemical or atmospheric influences, compared to ground laying. But above all need to choose the right protective case, corrugation.

HDPE pipes that are suitable for cable protection when installed in the ground:

flexible corrugated pipe;
the corrugation is double-sided (the outer side is made of polyethylene low pressure, internal (smooth) - made of high pressure polyethylene);
products from recycled materials (technical insulating corrugation);
flexible corrugation with reinforced coating;
hard and smooth pipe.

Properties of HDPE cases for installation in the ground

The corrugation used to pull power wires along the ground should not have the property of magnetization. Therefore, for its manufacture, special ceramics, plastic or asbestos cement are most often used.

The diameter of the necessary protection directly depends on the length of the cable that you want to run: power wire up to 5 meters can be placed in a 50 mm pipe; if its length is from 5 meters and above, a product with a diameter of 100 mm is used.

There are several layers in the HDPE pipe:

the outer layer is a protective case made of structural steel;
insulating layer on the screen (PVC);
the screen itself (Cu layer);
XLPE - insulating layer along the core;
core (material: Al or Cu).

The current will pass through the core, behind the screen and the pipe (eddy currents). Regarding the production of this product, quality manufacturing takes place in special workshops, where visual developments (mock-ups) are used, taking into account the mechanism for further laying the power wire.

Advantages of HDPE corrugated pipe

It differs from metal products in that it is much cheaper. Both products manufactured in accordance with GOST and recycled pipes can withstand long-term operation (characteristics and color will differ slightly).

The main advantages of this product include:

cable laying can be carried out along a curved path without the use of auxiliary frames (but, despite the increased flexibility, with a strong bend, the corrugation breaks, and you simply cannot stretch the power wire);
under normal conditions, the operational period reaches 50 years;
to connect individual sections there is no need to use welding machines;
corrugated pipe is much lighter than metal;
has excellent electrical insulation properties, does not need grounding;
have excellent, therefore, do not collapse under the influence of external negative factors;
resistance to temperature changes from -25 to +75 degrees;
do not accumulate condensate on the soil surface, do not oxidize and do not emit toxic substances.

Ways of laying in the ground

There are two ways of laying the cable into the ground in corrugated cases: with trenching and trenchless laying. Which one is best depends on the location of the installation.

The method of laying the cable along a protective corrugated pipe, by digging a trench in the ground, is ideal for private houses and summer cottages. The laying depth must be at least 70-80 cm. This type of installation does not require additional couplings or blocks, but only to bring the wire out of the ground and connect with electrical system Houses.

Trenchless cable laying in a HDPE pipe is carried out in hard-to-reach places and is most often used by utilities, since it requires special equipment and devices.

Trenchless laying consists in horizontal, directional drilling of the soil without damaging its surface. A pipe is already installed in the resulting well with a wire inside.

Preparatory stage

First of all, you need to decide on optimal way installation of corrugated case. To do this, all information about the work site and the soil is collected (in order to avoid increased influence ground water; alkalis, acids, etc.).

Underground installation is used in case of normal groundwater level, good soil characteristics, absence of obstructing structures or roadways. Also local conditions affect the laying depth cable.

Before starting installation, it is also necessary to check the condition of the outlets and connections of the corrugated cases - they must be clean, with a prepared (specially treated) surface.

For easy pulling, an oily substance is applied to the wire, which, moreover, plays the role of signaling the pressure level in the pipe. The wire must not be damaged or defective. The laying should be as safe as possible, therefore, before starting work, all workers are additionally instructed, their tools and overalls are checked.

Cable laying in the ground (video)

The process of laying a cable in a pipe

At the power line design stage, it is necessary to determine the exact length of the channel into which the pipe will be inserted. Draw a plan for laying the power rein.

Consider the laying process by digging a trench:

a pipe is laid on the prepared soil with a sand cushion (10 cm of loosened sand) (without tension, in small horizontal waves);
we stretch the wire (pipes can be laid already with the wire stretched inside, or, by tying it to a copper wire, stretch it after laying the corrugations);
we fill the pipes with a layer of sand so that they are not visible;
we fill them with a layer of soil of 15 cm and tamp it down;
stretch the signal tape along the entire length;
completely fill the trench and tamp the soil;
we make a test measurement of the insulation resistance of the power wire.

You can stretch the cable in the pipe and install it by digging a trench yourself, without complex fixtures or equipment. All laying steps must be carried out according to the instructions, All materials are checked and prepared for use.

Before purchasing in the ground, make sure that it is not damaged by inspecting it along its entire length. The choice of high-quality building material and strict adherence to the installation instructions for engineering power wires is the key to their long-term operation without the threat of short circuits or other life-threatening incidents.

When installing communication networks, HDPE pipe for cable is widely used as a protective case. It is also used when laying power lines. The HDPE pipe reliably protects the cable from the influence of stray currents, mechanical damage and aggressive soil. Laying technology is determined by the purpose engineering networks and their location.

HDPE pipes for cable laying

The use of HDPE pipes for the installation of communications

For laying power lines and other engineering communications, various HDPE pipes are used. They differ in technical parameters and design features:

When installing electrical wiring in a floor screed or brick wall a smooth black HDPE pipe is used.
Products with a corrugated surface are used for laying open, semi-hidden and covert ways electrical, telephone, television and computer networks operating under electrical voltage variable or direct current, the value of which does not exceed 1000 V. An electrical installation of this type can operate both outdoors and indoors.
For laying in the ground, HDPE corrugated pipes are used, which are characterized by increased elasticity and strength, the ability to restore their linear dimensions and ease of installation.

Depending on the design, the products are available with or without a probe. It is a special device that is designed to pull the cable inside the pipe. This reduces the time for laying power networks and communications.

In the absence of a probe, the cable is drawn using a reusable device. The complexity of the operation increases somewhat, besides, the presence of certain technical support is required. However, a HDPE pipe for laying a cable without pulling can be used repeatedly. This possibility is relevant for private repairs of communications.

Pipe for cable laying corrugated with probe

Among manufacturers of HDPE pipes for laying electrical cables, DKS products are most in demand. It is represented by corrugated products "Octopus", designed for installation of hidden wiring indoors. Expanded with accessories and various types boxes that ensure the laying of communications in strict accordance with established standards.

DKS company products: HDPE pipe "Octopus"

To protect the power and signal cables, a series of double-walled pipes "Octopus" is used. They reliably protect electric wires from damage as a result of mechanical influences and influence environment. The tightness of the plastic prevents the penetration of moisture even when laying the cable in the ground.

Advantages of HDPE pipes

Compared to HDPE metal protective cases, a cable pipe is much cheaper. Moreover, it is not necessary to use products that are produced in accordance with the requirements of GOST for laying power lines and various communications - it is allowed to use products from recycled materials. The HDPE technical pipe is made from production waste, which is mixed with various polyethylene additives. This slightly changes the performance and color finished products, but allows you to significantly reduce costs and reduce its cost.

In addition, HDPE cable pipes have the following advantages:

the service life under normal conditions is up to 50 years;
individual sections can be connected without the use of a welding machine;
have a small weight compared to metal protective cases;
do not require grounding, as they have good electrical insulating properties;
are not subject to destruction under the influence of an aggressive environment and corrosion;
retain their parameters even in difficult operating conditions and can withstand temperature drops in the range from -25 ⁰C to +70 ⁰C;
do not emit toxic substances and do not accumulate condensate on the surface.

The cable in the HDPE pipe can be laid along any curved path without the use of connecting elements, since the polymer is bendable. Particularly easy to change the configuration of products of small diameter.

However, HDPE pipes should not be bent too much: this can provoke a hall and it will not be possible to stretch the cable.

Methods for laying an electrical cable

The technical features of laying HDPE pipes depend on the location of the cable and its operating conditions. This also affects the list of equipment used and the necessary components.

Installation in enclosing structures

Inside the premises, electrical wiring using HDPE pipes is laid as follows:

outline the location of the cable;
fix the pipe, and it can be attached to the floor with metal brackets, and to the ceiling or walls - with special holders with a latch;
pull the cable so that it is located freely, without tension;
the structure on the floor is poured with a concrete screed, and in the wall or ceiling it is covered with plaster or other materials, depending on the diameter of the protective case.

Cable laying using HDPE pipes on the floor

HDPE pipe allows:

reduce the length of the wiring;
realize repair work and cable hauling without damaging the surface of ceilings and walls.

When installing communications indoors, it is possible to use various connecting parts to fix individual sections of the protective casing: bends, couplings and other components. However, corrugated elements are most often in demand for turns at the points where the pipe enters the floor slab or the transition from the floor to the wall. In this case, the HDPE pipe for electrical wiring must be bent at an angle of 90⁰, and this is impossible without crushing and deforming the material.

According to current regulations, for the installation of hidden electrical wiring, which is located inside floors or walls made of non-combustible materials, it is allowed to use smooth or corrugated HDPE pipes.

Laying in the ground with digging a trench

This technology is in demand when laying communications on summer cottages. Before starting work, you should inspect the cable and check the integrity of the sheath. If it is damaged, the protective function of HDPE pipes will be useless.

Then, during the laying process, the following operations are performed:

make markings and dig a trench of the required depth;
a HDPE pipe is placed in it with or without a broach of the desired diameter;
pull the cable and lay it in such a way that it is located without tension;
the pipe is first covered with a layer of sand 10 cm thick, and then with soil by about 15 cm.

To quickly locate the cable, you can lay a special signal tape over it.

Cable laying using HDPE pipes in the ground

When using HDPE pipes for laying power networks in the ground, it is desirable to exclude the use of couplings and other connecting elements, since this makes it difficult to ensure sealing. However, when the cable is brought into the building, fittings are simply necessary.

For laying the cable in a straight section, use solid pieces with a cross section of at least 4 mm. If the section is too long, then an elastic metal wire or a special nylon broach should be used to tighten the electrical wiring. They are first launched into the pipe, and then the tied cable is tightened.

Trenchless laying

Trenchless technology is used for laying electric cable, which is located in hard-to-reach places. Most often, it is in demand by public utilities, as it is carried out with the involvement of complex equipment and special equipment.

The essence of the method lies in horizontal directional drilling, which allows you to lay underground communications without disturbing the surface layer of the soil. First, they study the composition of the soil and obtain permission to carry out earthworks. Then the cable is laid in the HDPE pipe, which includes the following steps:

Drilling a pilot well. The puncture of the soil is carried out using a drill head, which has a bevel in the front and built-in radiation. When it enters the ground through special holes, a solution is supplied that fills the well. It reduces the risk of collapse and cools the heated tool.
Well expansion. It is performed by a rimmer that replaces the drill head.
Laying HDPE pipes with cable inside. They are pulled into the well using a drilling rig.

Cable laying by horizontal drilling

The main disadvantage of horizontal directional drilling of soil is the complexity of its implementation, therefore, for such work, they conclude an agreement with an organization that specializes in such activities and has the necessary equipment.

Horizontal drilling rig

Laying a cable using HDPE pipes allows you to provide reliable protection for a long period of time, you just need to follow the technology for installing power lines and other communications.

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.

Additionally, it should be noted that for different types styling, various 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 stability 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.

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 stony, 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 impact on the 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 shell is a reinforced case and serves as a solid base to maintain the shape of the product. The inner part is made 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, a smooth or corrugated pipe is taken for the cable - 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.

When laying electrical cables, it is imperative to take care of their protection, regardless of whether communications are installed on the street or in a building. The most common material used to protect communication networks are HDPE pipes (pipes made of low-pressure polyethylene), which provide reliable protection against any external influences. About in which pipes the cable is laid in the ground, and will be discussed in this article.

Production of HDPE pipes

LDPE and MDPE polyethylene are used as raw materials for the production of corrugated pipes. Pipes that are not subject to combustion or flame retardant, in addition to polyethylene, contain a fire retardant.

Production method polyethylene pipes is extrusion. All work is carried out using high-tech equipment that automatically monitors the quality of finished products. Close monitoring and monitoring of performance parameters optimizes raw material costs, minimizes the possibility of defective products and reduces the cost of final products.

HDPE pipes consist of a single layer, characterized by a flat surface. This pipe does not pass electricity, has excellent strength characteristics and withstands most aggressive chemicals. The standard color of polyethylene pipes is black. Flexible HDPE pipes are well suited for the installation of electrical networks in a building.

HDPE pipes for laying cables in the ground

The laying of an electrical cable underground can be carried out using the following types of HDPE pipes:

Light corrugated;
Heavy corrugated;
Halogen-free;
Rigid smooth-walled;
Double-walled.

To give the corrugated pipe greater rigidity, you can use a metal wire as a reinforcing element. Double-walled pipes feature a smooth polyethylene inner jacket and a corrugated top layer. Such a device has an increased degree of ring rigidity, which provides the structure with additional strength.

Smooth-walled pipes are best option for the installation of an electrical cable, which greatly simplifies the process of laying communications. Ease of installation is also reinforced by the low weight of polyethylene products, the installation of which does not require complex and bulky equipment. Pipe connection technology involves the use of sockets without sockets.

Two-layer corrugated pipes have all the advantages of polyethylene products, including the possibility of installation at low temperatures. A standard underground cable pipe can last more than 50 years, which is considered very good compared to other building materials.

Classification of HDPE pipes for cable laying

When laying electrical networks, standard black pipes are usually used. Corrugated pipe for laying in the ground is excellent for arranging various communications, the power of which does not exceed 1 kW - and these are telephone and television cables, computer and household electrical networks.

Cable laying can be done in three ways:

open;
semi-hidden;
Hidden.

All these methods are used to some extent both on the street and in the building. The corrugated pipe for laying cables in the ground has all the necessary characteristics, including high strength, flexibility, the ability to change linear dimensions and ease of installation.

Polyethylene pipes can be produced with or without a probe (broaching). A broach is a special structural element that allows you to run a cable along the inner surface of the pipe. Pipes with a probe are very convenient and can significantly reduce the time required to lay a communication line.

In addition, cable pulling in a pipe can be performed using special devices, but this is very difficult and requires special equipment. Pipes that do not have a broach are quite suitable for reusable use, but cable laying in it is carried out with great labor costs.

Technical characteristics of HDPE pipes

According to the standards ready product must not have any damage - various sagging, swelling, cracks and other defects are not allowed. In addition, the pipe should not delaminate. The inside of the pipes must be perfectly smooth, and the outside must have a uniform structure.

Any HDPE pipe for cable laying must have a high degree of wear resistance. Polyethylene products are able to withstand internal pressure up to 20-38 MPa with a linear expansion coefficient of 140 Pa, depending on the type of pipe.

The working pressure value for different types of pipes is as follows:

Light electrical pipes - 0.25 MPa;
Medium light - 0.4 MPa;
Medium HDPE pipes - 0.6 MPa;
Heavy pipes - 1 MPa.

Advantages of HDPE pipes

Among the advantages of HDPE pipes, one cannot fail to note the long service life, which, under reasonable operating conditions, reaches 50 years. To a large extent, this is due to the complete resistance of polyethylene products to corrosion and aggressive environments, as well as the absence of condensate on the pipe surface. Working temperature plastic pipes, at which they do not lose their characteristics, ranges from -25 to +70 degrees.

Installation of pipes of small diameter is quite simple and does not require the use of special equipment. Various connecting elements are also not required - the possibility of free bending (of course, within reasonable limits) allows you to lay the pipeline in almost any conditions. Besides, polymer pipes they are not conductors of current, therefore, during their installation, grounding is not required, and incombustibility prevents the structure from burning even in the event of a short circuit.

Marking of pipes made of low pressure polyethylene

All HDPE pipes must be marked in accordance with the standards. Marking not only allows you to classify different types of pipes, but also makes it possible to control the quality of products - the applied designations are a guarantee of the suitability of the material for use.

Each pipe has symbols displaying the trademark or the full name of the manufacturing company. Labeling can be carried out according to national or international standard. The next element is the material of manufacture. For example, a pipe made of PE 80 is displayed as MRS 8. The pipe must also be marked with a minimum wall thickness, outer diameter and nominal pressure (bar).

A separate item may indicate the suitability of the pipe for arranging a gas pipeline network or transporting drinking water. The last marking item is the batch number and date of manufacture of the pipe.

HDPE pipes are divided into six classes with the following designations:

Heavy - T;
Medium-heavy - ST;
Medium lightweight - OS;
Medium - C;
Medium-light - SL;
Lungs - L.

Selection of HDPE pipes for cable laying

It is necessary to select the protective material for laying the cable in the ground correctly. Perhaps the most important parameter that you need to build on when choosing is the number and dimensions of the wires of the communication network. There is a direct relationship between these indicators and pipe dimensions, which can be understood if we take a closer look at the most popular sizes of corrugated HDPE pipes.

When choosing a material, you need to know exactly their pipe dimensions. The diameter of standard polymer products can vary from 16 to 225 mm. Pipes with a small cross section (up to 90 mm) are produced in coils, the length of which can be 100 or 200 m. If the diameter exceeds 90 mm, then the length of single pipe sections is 12 m.

To assess the degree of pipe strength, you need to know what the SDR parameter is. To calculate this parameter, you need to divide the outer diameter by the wall thickness. The strength for this parameter is estimated simply: the smaller the calculation result, the greater the mechanical strength of the product.

Features of laying technical pipes

It is possible to lay technical pipes on the street, underground and in any buildings. When laying protection in a building, the pipeline should not be located openly, but installed in concrete, brick or plasterboard walls.

The main nuances that arise during work are as follows:

Installation of polyethylene pipes is possible at an ambient temperature of at least -30 degrees.
If the structure will be laid in a trench, the depth of which exceeds two meters, you need to take care of a protective concrete channel with a thickness of 80-100 cm.
With a horizontal pipeline, protection can be tightly concreted in the foundation.
When laying HDPE pipes for cable in the ground, it is necessary to monitor the tightness of all connections - this will protect the structure from various contaminants entering it. Compression couplings and butt welding are best suited for connecting individual parts of pipes. Using fittings in the design of the pipeline, you can simplify installation and increase the reliability of the connection.
In the event that the design will work in conditions of the possible appearance of condensate, care must be taken to install a pull tube that collects moisture.

Laying electrical cables in structures

When arranging hidden wiring, it is quite possible to use smooth or corrugated pipes - there is not a single standard that would prohibit such protection.

The installation procedure for HDPE pipe is as follows:

First you need to mark all the points through which the cable will pass;
The pipe is fixed in accordance with the selected trajectory;
An electric cable is pulled through the pipe;
The structure is closed with a concrete screed if the pipeline is on the floor, or with plaster if the communication is located on the ceiling or wall. Laying the cable in the pipe allows you to further repair or update the wiring without violating the integrity of the surface under which the pipeline is located.

If desired, pipes can be attached to the floor using metal brackets, and holders with a latch are suitable for fixing the structure on a wall or ceiling. In any case, when laying the cable, you need to make sure that there is no tension on it.

When arranging communications in a room, you can use connecting elements for mounting pipeline sections, but the best choice there will still be corrugated elements - this will avoid kinks in a smooth pipe, due to which the material can be deformed.

Outdoor cable laying

The need for laying cables on the street often arises on their own land. Of course, we are talking about protection as well. electrical network. Before laying the cable in HDPE pipes, you need to make sure that there is no damage to its structure.

Laying HDPE pipe for cable in the ground is as follows:

First you need to mark a trench of suitable dimensions and dig it;
A HDPE pipe selected in advance for underground cable laying is laid in the trench;
There is a cable in the pipe (there should be no tension);
After pulling the cable, the pipe is covered with a 10 cm layer of sand and 15 cm of soil.

So that in the future the laid cable can be found, a signal tape or similar material should be left above it. When laying pipes in the ground, it is advisable to refrain from connecting them with couplings and other connecting elements - they can cause seal failure. Fittings can only be used to enter the electrical line into the building.

Trenchless cable laying in the ground

In some situations, it is not possible to prepare a trench for laying a protective pipeline. In this case, it is possible to lay a cable in a pipe only with the help of special equipment that allows you to implement a trenchless laying method, for which soil is drilled horizontally - HDD drilling technology, which often has no alternative. Before work, in addition to preparing equipment, it is necessary to obtain a permit for drilling and conduct a geological analysis of the soil.

Cable laying in a protective pipe is carried out according to the following algorithm:

First, a pilot well is drilled;
The size of the well is increasing;
A HDPE pipe with an electric cable inserted into it is installed in the well.

When drilling a well, a soil puncture is carried out, through which a solution will be supplied to the ground, filling the well, adding strength to it and a cooling tool during operation. To expand the well, a trimmer is used, which is installed on the equipment instead of the previously used drill head. The installation of HDPE pipes into the well is also carried out using equipment.

Horizontal drilling technology has one significant drawback - the work requires specific skills and equipment. Because of this, only companies specializing in soil drilling are able to implement this method.

Conclusion

HDPE pipe for laying cables in the ground allows you to protect the electrical line from possible damage caused by external factors. Polyethylene products have all the necessary characteristics and have affordable price so they should be considered first.

Underground routes of electric cables and communication lines are subject to various threats - flooding, mechanical destruction during ground movements or pressure on the soil surface, and stray currents. Although most cables are covered with strong layers of insulation and braid, extra protection is needed. In recent decades, HDPE pipes for cable have been used for this purpose, which you can purchase with delivery to Moscow by placing an order on the website or by phone.

Types of HDPE pipes for cable

From the entire range of pipe products, almost all articles can be used for cable laying. But two types meet the requirements most - technical and electrical pipes. The first are black smooth-walled products, which are successfully used for non-pressure pipelines. cold water. In case of electrical installation technical pipe HDPE for cable laying is used if the lines run in concrete screed or brick wall. They are also very convenient when installing underground lines using the puncture method (HDD). In this case, the pipe is pulled into an inclined or horizontal well along with a cable installed in it. The technology is quite complex and requires special equipment and highly qualified personnel. Smooth-walled rigid HDPE pipe with a low SDR (up to 9) is ideal for laying cables at great depths - it withstands significant ground pressure and protects the cable from possible breaks.

Special pipes for electrical purposes

In most cases, for underground and surface mounting of highways, an electrical HDPE pipe is used for cable laying. It is two-layer - smooth inner (LDPE) and corrugated outer (HDPE). Internal provides minimal resistance to cable pulling. For this, a special steel or polypropylene cable is used - a probe. Standard HDPE cable conduit can be supplied with or without probe installed inside. A HDPE pipe for electrical purposes is produced according to GOST 16338 (marking 277, 276, 286, 273 and 271) or GOST 16337 you can recognize them by a different marking, for example 0803-020. According to the standard, the products are divided into several types: heavy and light corrugated; double-walled; heavy smooth; halogen-free. They differ primarily in their ability to withstand external pressure, which determines the possibility of installation at different depths. Lungs are designed for a pressure of not more than 0.25 MPa, medium - 0.4 - 0.6 MPa, heavy - up to 1 MPa. When ordering non-standard products, the permissible limiting pressure is also selected. The mass of the pipe and its strength directly depend on the SDR indicator. For cable lines, products with SDR from 7.4 to 26 are used, depending on the operating conditions of the future trunk and the method of pulling. For the HDD method, only products with a ratio of 7.4 - 11 can be taken. Also, shells for various purposes differ in color: red - for high-voltage mains; blue - communications and telecommunications; black - general purpose.

Smooth HDPE pipes for cables

Smooth HDPE pipes for cables are black, they are produced with a single-layer wall and are not reinforced. Some varieties of two-layer reinforced, they are designed for operation in difficult conditions. Promtekhkomplekt offers a full range of electrical and water pipes from polyethylene. You can buy HDPE pipe for cable in Moscow both in coils and in sections of the required length with delivery to the destination. We have the lowest price of HDPE pipes for cable - we cooperate with the five largest factories for the production of this type of product and receive goods at a special dealer price. This allows not only to keep prices acceptable for the customer, but also to offer discounts and bonuses for regular partners and wholesale buyers.