RU2632576C1 - Fibre-optic communication line and device for laying it in pipe of underground cable-conduit line - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: fibre-optic communication line containing microcables placed in the pipe of underground cable-conduit line, wherein the microcables are pulled inside the microtubes which are grouped into one or several packets. The microtubes are made of high-density polyethylene with the use of an additional means for reducing sliding friction, while longitudinal grooves on the inner surface of the microtubes are used as an additional means for reducing sliding friction, with the formation of protuberances, wherein the depth of the longitudinal grooves is chosen according to the condition: h = (0.05…0.2)δw, where: h is the depth of the longitudinal grooves, δw is the thickness of the microtube wall, while the thickness of the microtube wall is chosen according to the condition: δst = (0.17…0.28) d_mc, where d_mc is the internal diameter of the microtube.

EFFECT: reduced friction between the microtubes and the pipe walls of the underground cable-conduit line and between the microtubes and the fibre-optic microcables, and between the microtube packets and the pipe of the underground cable-conduit line.

4 cl, 35 dwg, 4 tbl

Description

The group of inventions relates to fiber-optic communication lines and is intended to ensure the transmission of information flows.

Known fiber optic communication line according to the patent of the Russian Federation for the invention No. 2199142, IPC G04B 6/44, publ. 02/20/2004

This fiber-optic communication line can be used in the construction of suspended optical cables for the construction of fiber-optic communication lines on power lines. The cable contains a central dielectric element, optical fibers in polymer modules, a hydrophobic filler, an internal dielectric sheath compensating for twisting of the cable, and an external dielectric sheath. The outer dielectric sheath over the entire outer surface is corrugated with different heights and corrugation pitch.

Disadvantages:

- the communication line is not suitable for laying underground,

- There are no measures to accelerate installation.

Known fiber-optic communication line containing fiber-optic microcables located in the channel of the underground telephone drain, mounting couplings, manholes (see, for example, utility model description for patent RU No. 2099755, IPC G02B 6/46, publication date 12/20/1997 d).

The disadvantage of this analogue is the low efficiency during operation, due to low maintainability.

Known fiber-optic communication line, disclosed in the training manual "Design, construction and operation of fiber optic links", V.I. Efanov, Tomsk, 2012, which consists of microcables placed in an underground cable duct channel in a pipe, with microcables extending inside microtubes, grouped into one of the packages (see pages 29, 36), microtubes are made of high polyethylene

hardness using an additional means of reducing sliding friction, see page 29, fig. 2.17, a prototype fiber optic communication line.

Disadvantage: great efforts when pulling microcables in microtubes.

A device for laying a fiber-optic communication line is described on the Internet site http://www.microduct.ru/htmlpages/Show/technology/zaduvka-optovolokna (Appendix 1).

This device for laying a fiber optic communication line includes a coil with a micro cable and a compressor with a drive connected by a pipe to a microtube located in an underground cable duct.

This method of laying a fiber optic communication line by pneumatic blowing involves supplying compressed air from the compressor to the microtube, in which a cable lug is installed.

The current state of the underground communications infrastructure in a highly competitive market with a large number of telecom operators building and owning linear-cable communication facilities does not meet the needs of the market. Telephone drainage resources are mostly exhausted - telephone drainage channels are randomly filled with communication cables of various types and design features, while cable bundles 1 sometimes create insurmountable difficulties when laying new or replacing existing cables without possible damage to other cables.

The high cost of the construction of a new cable sewer, the need to obtain a permit for land allocation and the issuance of permits related to work in the underground sewage system negatively affects the pace of development and forces telecom operators to place telephone cables on the roofs of houses and electricity poles. A network of telephone communication cables tightened the architectural appearance of Russian cities.

A device for laying a fiber-optic communication line from the article "On the methods of pneumatic laying of communication cables" to the magazine "Photon Express", K.K. Nikolsky, 2006, pp. 20-21, a prototype device for laying a fiber optic communication line.

This device for laying a fiber optic communication line contains a coil with a fiber optic micro cable and a compressor with a drive connected by a pipeline to the pipe channel of the underground cable duct.

Disadvantage: great efforts when pulling microcables in microtubes.

The task of creating a group of inventions is to reduce efforts when laying a fiber optic communication line, speeding up the process and, as a result, reducing the cost of building a fiber optic cable in a telephone sewer (financial, labor).

The essence of the technical solution lies in the fact that it contains fiber-optic microcables located in the channels of the underground structured telephone drain - STK, mounting couplings, manholes, and differs from the closest analogue in that the STK is a sewer consisting of one or more packages micropipes made of high density polyethylene having an internal coating with a low coefficient of friction.

Technical result achieved: reduction of friction on the outside of the microtubule package and the walls of the underground cable duct or on the inside of the microtube and fiber-optic microcable.

The solution of these problems was achieved in a fiber-optic communication line containing microcables located in the underground cable duct channel pipe, while the microcables are extended inside the microtubes, which are grouped into one or several packages, the microtubes are made of high density polyethylene using an additional means of reducing sliding friction in that, as an additional means of reducing sliding friction, longitudinal grooves are used on the inner surface of the microtubes, with the formation protrusions, while the depth of the longitudinal grooves is made from the condition:

h = (0.05 ... 0.2) δst,

Where:

h is the depth of the longitudinal grooves,

δst is the microtube wall thickness, while the microtube wall thickness is selected from the condition:

δst = (0.17 ... 0.28) d _mk ,

where: d _mk is the inner diameter of the microtube.

The solution of these problems was achieved in a device for laying a fiber-optic communication line, including a coil with a fiber-optic micro cable and a compressor with a drive connected by a pipeline to the pipe of the underground cable channel

sewage system, in that it contains an air pressure sensor at the outlet of the compressor, a sensor for measuring the tension of the optical fiber microcable and means for controlling pressure and air flow, the device also contains a control computer, a control controller and a sensor controller, while the control controller is connected to the communication channel means for controlling pressure and air flow and brake drive.

The compressor drive can be made in the form of an electric drive, with electric wires connected to it, the means for controlling the pressure and air flow rate are made in the form of a rheostat in the gap of one of the electric wires.

The means for controlling pressure and air flow can be made in the form of a throttle valve installed in the pipeline at the outlet of the compressor.

The invention is illustrated by drawings (Fig. 1 ... 35), where:

- in FIG. 1 shows the placement of one microtube with one micro cable in the pipe channel of the underground cable duct,

- in FIG. 2 shows the placement of one package of microtubes in the pipe channel of the underground cable duct,

- in FIG. 3 shows the placement of several packages of microtubes in the pipe channel of the underground cable duct,

- in FIG. 4 shows a package of microtubes,

- in FIG. 5 shows a package of two microtubes,

- in FIG. 6 shows a package of 6 microtubes,

- in FIG. 7 shows a package of 7 microtubes,

- in FIG. Figure 8 shows a cross-section BB of a micro cable,

- in FIG. 9 shows a microtube with an anti-friction coating on the inner surface,

- in FIG. 10 shows a microtube with anti-friction lubricant on the inner surface,

- in FIG. 11 shows a microtube with an anti-friction coating and anti-friction lubricant on the inner surface,

- in FIG. 12 shows a microtube with an anti-friction coating on the outer surface,

- in FIG. 13 shows a microtube with anti-friction lubricant on the outer surface,

- in FIG. 14 shows a microtube with an anti-friction coating and anti-friction lubricant on the outer surface,

- in FIG. 15 shows a microtube with an anti-friction coating on the inner and outer surfaces,

- in FIG. 16 shows a microtube with anti-friction lubricant on the inner and outer surfaces,

- in FIG. 17 shows a microtube with an anti-friction coating and anti-friction lubricant on the inner and outer surfaces,

- in FIG. 18 shows a microtube with longitudinal grooves,

- in FIG. 19 shows a fragment of C, the first option,

- in FIG. 20 shows fragment C, the second option,

- in FIG. 21 shows fragment D,

- in FIG. 22 shows a package of 6 and 2 microtubes in a casing,

- in FIG. 23 shows a package of 7 microtubes in a casing,

- in FIG. 24 shows a microtube in section,

- in FIG. 25 shows graphs of changes in the relative wall thickness of microtubes depending on their diameter,

- in FIG. 26 shows a diagram of the laying of a packet of microtubes in an underground cable duct pipe,

- in FIG. 27 is a diagram of a microcable in a microtube package,

- in FIG. 28 shows a diagram of a tip for pneumatically laying a micro cable,

- in FIG. 29 shows graphs of the dependence of the cable entry length on the diameter of the microtube and on the diameter of the microcable,

- in FIG. 30 shows a diagram of the laying of an optical fiber microcable, the first version with an axial force sensor on the microcable,

- in FIG. 31 shows a diagram of the laying of an optical fiber microcable, the first embodiment with a torque sensor,

- in FIG. 32 shows a diagram for measuring axial force on an optical fiber micro cable,

- in FIG. 33 shows a diagram of the laying of an optical fiber microcable, the second option,

- in FIG. 34 shows the layout of packages of microtubes with microcables in a free pipe of an underground cable duct,

- in FIG. Figure 35 shows the layout of a package of microtubes with microcables in a previously laid underground cable duct, in which a cable for a wired communication channel is already installed.

The conventions used in FIG. 1 ... 35:

1. - fiber optic micro cable,

2. - microtube,

3. - pipe underground cable duct,

4. - package

5. - the outer shell of the microtubule package,

6. - optical fiber,

7. - anti-friction coating,

8. - the inner surface

9. - anti-friction lubricant,

10. - the outer surface,

11. - longitudinal furrows,

12. - longitudinal protrusions,

13. - contact pads,

14. - viewing well,

15. - coil,

16. - brake

17. - drive

18. - platform

19. - surface

20. - movie,

21. - movie,

22. - movie,

23. - movie,

24. - coil

25. - compressor,

26. - drive

27. - pipeline

28. - means of controlling pressure and air flow,

29. - cable guide

30. - pneumatic control device

31. - cable fastening device,

32. - control computer,

33. - monitor,

34. - communication channel,

35. - control controller,

36. - sensor controller,

37. - control channel,

38. - electrical wire,

39. - rheostat,

40. - a remote-controlled drive,

41. - pressure sensor,

42. - communication line,

43. - a sensor for measuring the tension of the fiber optic microcable,

44. - communication line,

45. - microcable length sensor,

46. - communication line,

47. - control channel,

48. - communication line,

49. - communication line,

50. - torque sensor,

51. - communication line,

52. - throttle,

53. - coupling

54. - cable wired communication channel.

The essence of the proposed devices and method is illustrated in FIG. 1 ... 35.

The basis of fiber-optic communication is fiber-optic microcables 1, laid in a microtube 2, in turn, laid in a pipe of the channel of the underground cable duct 3 (Fig. 1).

The fiber-optic communication line in the most optimal variant (Fig. 1 ... 4) is a package 4, which consists of one or more microtubes 2 with a diameter, for example: 7, 10 or 12 mm, etc. (construction length on average up to 2 km ) made of high density polyethylene.

In FIG. 5 ... 7 show three options for package 4 in cross section AA.

It can be seen that packet 4 consists of several microtubes 2, inside of which fiber-optic microcables are laid 1. Package 4 has a sheath 5. Fiber-optic microcable 1 contains optical fibers 6 (Fig. 8).

A feature of the fiber-optic communication line is the presence of an additional means of reducing the friction coefficient between the fiber-optic microcable 1 and the inner surface of the microtubes 2 and between microtubes 2 or packet 4 of microtubes 2 with a pipe of the channel of the underground cable duct 3.

This tool can be made in the form of an anti-friction coating 7.

The antifriction coating 7 (Fig. 9) can be made on the inner surface 8 of the microtube 2, which provides a decrease in the coefficient of friction when pulling the fiber-optic microcable 1 inside the microtube 2 by about half compared with the surface of conventional polyethylene compositions.

In FIG. 10 shows a microtube 2 with anti-friction lubricant 9 on the inner surface 8, and in FIG. 11 shows a microtube 2 with an anti-friction coating 7 and anti-friction lubricant 9 on the inner surface 8.

It is possible to use an anti-friction coating 7 and anti-friction lubricant 9 on the outer surface 10 of the microtubes 2. FIG. 12 shows a microtube 2 with an anti-friction coating 7 on the outer surface 10, and in FIG. 13 shows a microtube 2 with anti-friction lubricant 9 on the outer surface 10. In FIG. 14 shows a microtube 2 with an anti-friction coating 7 and anti-friction lubricant 9 on the outer surface 10.

It is possible to use an anti-friction coating 7 and anti-friction lubricant 9 simultaneously on the inner 8 and outer 10 surfaces of the microtubes 2. In FIG. 15 shows a microtube 2 with an anti-friction coating 7 on the inner 8 and outer 10 surfaces, FIG. 16 shows a microtube 2 with anti-friction lubricant 9 on the inner 8 and outer 10 surfaces, in FIG. 17 shows a microtube 2 with an anti-friction coating 7 and anti-friction lubricant 9 on the inner 8 and outer 10 surfaces,

In FIG. 18 ... 21 shows a microtube 2 with longitudinal grooves 11 and protrusions 12 between them, forming contact pads 13.

Optimum height of longitudinal grooves 11:

h = (0.05 ... 0.2) δ _article , where:

h is the depth of the longitudinal grooves 11,

δ _article - the thickness of the microtube 2 (Fig. 24).

The use of a smaller depth of the longitudinal grooves 11 has no effect, and with a greater depth, the strength of the microtubes 2 sharply decreases.

In FIG. 24 shows a cross section of a microtube 2.

In FIG. 25 shows graphs of the relative thickness of the microtubes δ _st / dmk and the same for tubes with a diameter of d _tr more than 12 mm.

From the graphs shown in FIG. 25, it follows that microtubes 2 have a relative thickness of 2 ... 3 times more than the relative thickness of the tubes (the tubes have a diameter of more than 12 mm). For tubes, the relative thickness is from 0.06 to 0.1 diameter, and for microtubes 2 from 0.17 to 0.28.

This is necessary because the laying of the microcable 1 in the microtubes 2 is carried out by the pneumatic blowing method and under no circumstances should it lose its round shape.

In FIG. 26 shows the process of pulling the package 4 of microtubes 2, and in FIG. 27 is a drawing process of a fiber optic micro cable 1. Next, a drawing process of a packet 4 of microtubes 2 and a fiber optic micro cable 1 will be described in more detail.

Packages 4 are placed in the pipe of the underground sewage 3, which connects the inspection wells 14 (Fig. 26). When choosing the material of microtubes 2, they were primarily guided by obtaining the minimum coefficient of friction.

Micropipes made of high density polyethylene

The difference between the technology of laying fiber-optic cable in an underground cable duct made of a structured package of 4 microtubes 2 from a traditional underground cable (telephone) duct made of asbestos-cement or polyethylene pipes ∅ up to 110 mm is that in the first case, the cable is laid by pneumatic blowing, and in the second - mechanical tightening.

When blowing the cable, the air flow and design features of microtubes 2 from high density polyethylene (their inner surface is made either corrugated or smooth) form a continuous sliding surface that reduces the coefficient of friction of the cable against microtube 2 to a value of no more than 0.1. Minimal tensile force acts on the cable, it does not twist.

When pulling the optical cable into the underground cable duct, it is necessary to constantly monitor the tensile load, which can adversely affect the physical and optical parameters of the optical fiber. In this case, the friction coefficient between the sheath of the optical cable and the channel of the cable duct can be 0.29 for polyethylene pipes, 0.32 for asbestos-cement pipes, and 0.38 for concrete pipes, which significantly exceeds the friction coefficient for the above microtubes 2.

Accordingly, the "blowing" speed can be up to 90 m / min at an average distance of about 1400-1500 m in one direction, which is 3 times faster than the method of mechanical cable pulling into the underground cable duct.

Microtubes 2 are produced from the highest quality raw materials with the following characteristics (Table 1).

Microtubes 2 are made of materials that do not support combustion. The bending radius of microtubes 2 depends on the ambient temperature. The minimum bending radius of the tubes is 20 times the outer diameter at a temperature of 20 ° C. At 0 ° C, the bending radius increases 2.5 times.

Technical requirements for the installation of microtubes 2 are given in table. 2.

The friction coefficient for high pressure polyethylene is 0.1.

However, there are materials having a friction coefficient of 0.05 or less.

For example, studies have shown that fluoroplastic has a very low coefficient of friction, which depends on the speed of the relative motion of the moving pair of samples.

Data on the dependence of the friction coefficient on the static and dynamic load (at low speeds) for fluoroplast-4 without lubrication are given below:

When lubricated, the coefficient of friction is about 2 times less.

The dynamic coefficient of friction of fluoroplast-4 on steel without lubrication at a load of ~ 20 kgf / cm depends on the sliding speed (Table 4):

The presence of lubricant allows to obtain a coefficient of friction of 0.025 or less. Types of lubricants are widely known in the art. Powder-based, grease and solid lubricants may be used.

A device for laying a fiber optic communication line is shown in FIG. 26 ... 33. In FIG. 26 is a diagram of the laying of a packet of 4 microtubes 2 in an underground cable duct 3 connecting a manhole 14. A device (first option) for laying a fiber optic communication line comprises a coil 15 mounted on an axis and having a brake 16 with a drive 17 and a platform 18. The platform 18 is mounted on the surface 19. The device includes rollers 20 ... 23.

In FIG. 27 is a diagram of the laying of fiber optic microcable 1 from coil 24 by pneumatic injection. A device for laying a fiber-optic microcable 1 contains a compressor 25 with a drive 26. The outlet of the compressor 25 is connected by a conduit 27 to the inlet of the microtube 2. At the end of the fiber-optic microcable 1, a cable-guide nib 29 is fixed. A means 26 for controlling pressure and air flow 28 going through the pipeline 27.

The design of the cable guide tip 29 is shown in FIG. 28. The cable guide tip 29 is made of 2 parts:

30 - pneumatic control device

31 - cable fastening device.

In FIG. Figure 29 shows graphs of the change in the input length of the fiber-optic microcable 1 Lmax depending on the diameter of the microtube channel d _tr and the diameter of the microcable 1 - d _micron without lubrication at a sliding friction coefficient m = 0.1.

It can be seen that in the best case it is possible to achieve the input length of the fiber-optic microcable 1 without lubrication of about 1,500 m. At the same time, with the lubricant it is possible to achieve the input length of the microcable L up to 2300 m.

In FIG. 30 shows a diagram of an automated pneumatic laying of a fiber optic communication line, which contains a compressor 25 with a drive 26, a control computer 32 with a monitor 33 connected to it by a communication channel 34. The compressor 25 is connected by a pipe 27 to the microtube 2.

The system includes two controllers: a control controller 35 and a sensor controller 36 connected by a control channel 37 to a computer 32. The pressure and air flow control 28 in the first embodiment (Fig. 30) is made in the form of a rheostat 39 with a remote-controlled drive 40. Drive 26, electric wires 38 containing a rheostat 39 are connected to a network. The rheostat 39 is equipped with a remote-controlled drive 40, for example, mechanically connected to it. A pressure sensor 41 (or a manometer) is installed in the pipeline 27, which is connected by a communication line 42 to the sensor controller 36. A sensor for measuring the tension of the optical fiber microcable 43 is connected to the fiber-optic microcable 1 on the fiber-optic microcable 1, which is connected by a communication line 44 to sensor controller 36.

A microcable length sensor 45 is connected to the fiber-optic microcable 1, which is connected by a sensor controller 36 via a communication line 46.

The output of the control controller 35, the communication line 47 is connected to the remote-controlled drive 40 and the communication line 48 to the drive 17 of the brake 16. The input of the control controller 35 is connected by the communication line 49 to the control computer 32. A control circuit for laying the optical fiber microcable 1 is possible, when instead of the sensor measuring the tension of the optical fiber microcable 43 applied to the torque sensor 50, connected by a communication line 51 with the sensor controller 36 (Fig. 31).

In FIG. 32 is a diagram for measuring the axial force F _os on a fiber optic microcable 1 for this embodiment.

The control computer 32, using the data of the microcable length sensor 45, recalculates the radius Ri and using the readings of the torque sensor 51 calculates the axial force acting on the fiber-optic microcable 1 according to the formula:

Foc = Mcr / Ri.

In FIG. 33 shows a third embodiment of the device in which a throttle valve 52 is installed in the pipe 27 and connected by a communication line 47 to the sensor controller 36 as a means of controlling pressure and air flow 28.

In FIG. 34 shows the layout of packages 4 of microtubes 2 with fiber-optic microcables 1 in a newly installed underground cable duct 3. The connection of fiber-optic microcables 1 is made by couplings 53.

In FIG. 35 shows the layout of a package of 4 microtubes 2 with fiber-optic microcables 1 in a previously laid underground cable duct 3, in which a cable for a wire communication channel 54 is already installed.

EXTRACTION OF THE MICROCABLE BY THE AIR BLOWING METHOD

The optical fiber microcable 1 is pulled by pneumatic blowing (FIGS. 27, 30 and 31) by supplying air from the compressor 25 to the pipe 27 and then to the microtube 2. Air pressure acts on the cable guide tip 29.

Automatic pulling of the fiber-optic microcable 1 is performed using the control computer 32, monitoring the torque with a torque sensor 50 (Fig. 31), the readings of which the control computer 32 is converted into axial force acting on the fiber-optic microcable 1.

If the axial force exerted on the fiber optic microcable 1 exceeds the maximum permissible value (Fig. 30), a signal is sent from computer 32 via communication line 49 to control controller 35 and then through control channel 47 to remote-controlled drive 40. Remote-controlled the actuator 40, acting on the rheostat 39, reduces the supply current of the actuator 26 and reduces the performance of the compressor 25 in terms of air flow and air pressure at the outlet of the compressor 25, which is controlled by the pressure sensor 41. The process continues until the axial violence up reaches the maximum permissible value.

For the second variant of the means for controlling pressure and air flow 28 (Fig. 33), a throttle valve 52 is installed in the pipeline 27 (Fig. 33). To control the pressure and air flow from the compressor 25 from the control computer 32, a signal is sent to the throttle valve 52.

The claimed design and method will maximize the efficiency of cable ducts by placing a larger number of fiber-optic microcables 1 in the same pipe channel of the underground cable duct 3. Also, the use of the group of inventions will reduce capital costs and reduce installation time and cost, since fiber-optic microcables 1 can be laid gradually, as necessary.

The claimed technical solution creates the conditions for laying one or more fiber-optic microcables 1 in the STK, and also protects these fiber-optic microcables 1 from possible damage during tightening of the channel blank device (especially with metal sticks) in the underground cable duct 3 for laying heavy massive cables or when drawing previously laid cables from an underground cable duct channel pipe 3.

The use of a group of inventions allowed:

- reduce the time for installation of the fiber-optic communication line and reduce the pulling force of the STK microtube package in the sewer due to the use of antifriction grease,

- reduce the cost of installing an optical fiber communication line by reducing friction when pulling a fiber-optic microcable.

Such STC can provide n microchannels (from one or more) placed in the channels of a standard underground cable (telephone) sewage system, for example, with a diameter of 110 mm.

The specified technical result is achieved by the fact that in the construction of fiber-optic communication lines in the STK for laying fiber-optic cable, the method of pneumatic laying is used instead of mechanical cable tightening. The “blowing” speed can be up to 90 m / min, at a distance of up to 1,500 m in one direction, which is 3 times faster than the method of mechanical pulling of the cable into the underground cable (telephone) sewage system.

At the same time, once laying the STK of the required capacity, the effective use of cable (telephone) sewerage increases many times, since the subsequent laying of the optical cable into the free channels of the STK or, if necessary, replacing the optical cable with a large capacity is performed without excavation.

Claims (11)

1. Fiber optic communication line containing placed in the pipe channel underground cable ducts, microcables, while the microcables are extended inside the microtubes, which are grouped into one or several packages, the microtubes are made of high density polyethylene using an additional means of reducing sliding friction, characterized in that longitudinal grooves are used as an additional means of reducing sliding friction on the inner the surface of the microtubes, with the formation of protrusions, while the depth of the longitudinal grooves is made from the condition: h = (0.05 ... 0.2) δst, Where: h is the depth of the longitudinal grooves, δst is the microtube wall thickness, while the microtube wall thickness is selected from the condition: δst = (0.17 ... 0.28) d _mk , where d _mk is the inner diameter of the microtube. 2. A device for laying a fiber optic communication line, comprising a coil with a fiber optic micro cable and a compressor with a drive, connected by a pipe to a pipe of an underground cable duct channel, characterized in that it contains an air pressure sensor at the outlet of the compressor, a fiber tension measurement sensor optical microcable and means for controlling pressure and air flow, the device also contains a control computer, a control controller and a sensor controller, while the controller is controlled It is connected by a communication channel to a means for controlling pressure and air flow and a brake drive. 3. A device for laying a fiber-optic communication line according to claim 2, characterized in that the compressor drive is made in the form of an electric drive with electric wires connected to it, the means for controlling pressure and air flow are made in the form of a rheostat in the gap of one of the electric wires. 4. A device for laying a fiber optic communication line according to claim 2, characterized in that the means for controlling pressure and air flow is made in the form of a throttle valve installed in the pipeline at the outlet of the compressor.

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