RU2332763C1 - Recovery method for sleeve of damaged "soaked" cable line - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: recovery of sleeve of "soaked" cable line is performed by removing moisture from hollow of dismantled and unsealed sleeve with subsequent filling of assembled and sealed sleeve with two-component liquid hydrophobic filler (LHF). At that, mixing of LHF components is performed just before it's using. According to invention polyurethane-based sealant "Pulast" is used as LHF, and the process of filling sleeve hollow with the sealant is performed by gravity, at that procedure of moisture removing from sleeve hollow and joints of cable ends cords also includes hot-air process.

EFFECT: improvement of recovered cable line reliability and gain in efficiency of damaged line recovery procedure.

4 dwg

Description

The invention relates to the field of underground operation of cable communications, and in particular to a technology for restoring couplings of “jammed” telephone communication cables with polyethylene core insulation.

Trunk telephone cable lines to ensure their moisture protection are operated under excessive air pressure.

If the outer sheath of such a cable and / or sleeve is damaged, air escapes through the damaged area, which eliminates the possibility of damage (soaking) of the cable line.

However, in case of significant damage to the cable and / or sleeve, when the air pumping system does not cope with the line, the cable line, including the sleeve, completely locks up, resulting in a decrease in the electrical characteristics of the cable and failure of the cable line.

A known method of restoring a coupler of a damaged "chamfer" communication line (1), which provides for the injection under pressure of a two-component liquid hydrophobic aggregate (ZhGZ) into the cable core. In this case, moisture in the cable and / or sleeve is expelled, and all voids in the core of the cable and / or sleeve are filled with ZHZ. After a certain time after injection into the cable and / or the ZhGZ coupling, which is carried out under a pressure of about 10 atm using a cable filling unit (UZK), the filler polymerizes (solidifies) and acquires a jelly-like consistency that does not flow out of the cable and / or coupling. As a result of this, the electrical characteristics of the damaged cable circuit (electrical insulation of conductors, influence parameters, etc.) are restored to existing standards. The liquid hydrophobic aggregate is a mixture of 2 components - oil-filled low-viscosity rubber FP-65-2M, which is the main one, and hardener - triethanolamine (TU6-09-2448-72). The components are mixed right before the start of the filler injection into the cable and / or sleeve, which is due to the fact that the polymerization (thickening) of the filler begins from the moment the components are mixed. To carry out the process of pumping the ZhGZ into the cavity of the coupling and / or cable, moisture must first be removed from them, for which the coupling is dismantled, and a technological hole is made in each of the 2 components of the housing, one of which is connected to the installation of ultrasonic testing and pumping the ZhGZ into coupling cavity and cable.

The disadvantages of this method is the need to use expensive and bulky equipment - ultrasonic testing, including a high pressure pump. In addition, the used filler (sealant) FP-65-2M contains technical oil, which, during prolonged contact with the polyethylene insulation of the cable cores, causes cracking (damage) of the insulation, which leads to a decrease in the electrical characteristics of the cable and, as a result, failure of the cable line.

The disadvantages of this method should also include the high complexity of the maintenance of the ultrasonic testing installation, since to maintain its operability, after completion of the ZhGZ injection work, washing of all the installation units in contact with the filler (sealant), kerosene or diesel fuel is required. Otherwise, the polymerized (thickened) sealant will make the installation inoperative, and to bring it into working condition, it will be necessary to thoroughly clean all the installation components from the sealant.

The claimed method eliminates the above disadvantages.

The technical result of the invention is to increase the reliability of the restored cable communication line, as well as improving the efficiency of the process of repairing a damaged line.

The technical result is achieved due to the fact that in the method of restoring the clutch of a “cable lock” cable line, including dismantling and depressurizing the clutch with the release of splices of the cable ends, removal of moisture from the cavity of the clutch and splices of the cable ends, making a technological hole in each of 2 x components of the coupling housing, mounting and sealing of the coupling to ensure that the technological holes are aligned coaxially with each other in the upper part of the coupling housing, after which the coupling cavity is filled with two a component hydrophobic liquid aggregate (ZhGZ) through one of the technological openings of the coupling body, wherein the components of the aggregate are mixed immediately before use, according to the invention, a Pulast filler on a polyurethane basis is used as a two-component liquid hydrophobic aggregate, the process of filling it into the coupling cavity through one of the technological holes is produced by gravity, and the operation of removing moisture from the cavity of the sleeve and splices of the cable ends also includes rabotku air.

The invention is illustrated by drawings, where:

figure 1 shows the clutch "suede" cable communication line in the context after recovery;

figure 2 shows the moment of pouring the liquid hydrophobic filler (sealant) "Pulast" into the cavity of the coupling;

figure 3 shows the moment of removal of the jumper separating the components of the sealant "Pulast";

figure 4 shows the moment of the process of sealing the coupling, namely the winding of its insulating tape.

The claimed method is implemented as follows.

The "locked" coupling 1 of the ends of cable 2 is opened, for which it is dismantled and depressurized, including disassembling the housing 3 of the coupling 1, made of 2 components that are moved apart, releasing the splices of 4 cores of the ends of cable 2. After that, they remove moisture from the cavity 5 of the sleeve 1 and the adjacent ends of the "locked" cable 2 with splices 4. From the ends of the cable 2 moisture is removed by periodically shaking them. The remaining moisture from the splice 4 ends of the cable 2, as well as from the cavity 5 of the housing 3 of the sleeve 1 is removed using paper towels, getting wet. Then, within one hour, they are finally drained with hot air (60-70 ° C) from an electric gun (not shown). After that, if this has not been done before, the screen is restored, for which, under the aluminum-polyethylene sheath of the cable, on both sides of the splices 4 of the lived ends of the cable 2, screen connectors 6, for example 4460 D, on which the screen bus (jumper) 7 is fixed, are mounted The splices 4 of the cores of the ends of the cable 2 are wrapped with a fine-mesh, knotless polyethylene net 8, which, for example, can be used as a sleeve or tape secured with a bandage (not shown). On each of the 2 components of the housing 3 of the coupling 1 (in the middle part), a technological hole 9 and 10 with a diameter of 16.5 mm is made with a special tool. If necessary, additional wiping of the inner surfaces of the coupling 1 with a paper towel is performed, while the technological holes 9 and 10 on each of the components of the housing 3 should be located in the upper part of the coupling 1 coaxially to each other (on the same line).

The connection points of the 2 components of the housing 3 of the coupling 1 to each other, as well as the housing 3 of the coupling 1 with the sheath of the cable 2 are sealed "cold" or "hot" way.

The “cold” method is that the joints to be sealed are wrapped with LG-2 insulation tape, on top of it - with 88T tape and Armoplast water-curing bandage 11.

The “hot” method consists in the fact that the joints are sealed with a two-layer “Radlen” tape with an adhesive layer, when its coils are heated with an open flame of a gas burner or with a stream of hot air.

Filling (filling) two-component liquid hydrophobic aggregate 12 (sealant) "Pulast" in one of the technological holes, for example 9, in the housing 3 of the coupling 1 is made through a funnel 13.

ZhGZ "Pulast" is packaged and stored in sealed package 14 with a jumper 15 separating its components. Immediately before using the sealant, the jumper 15 is removed and, manually, within 2 minutes, the contents of the package 14 are mixed. Then the package is bent and a hole 16 is cut out with scissors, through which the Pulast 12 liquid sealant is gravity-filled into the sleeve 1 through the technological hole 9, while the air from the coupling 1 exits through the second technological hole 10, and the filling is done until then, until the sealant appears in the hole 10. The hole 10 free from the funnel 13 is closed with a plastic stopper 17. The sealant 12 is poured for some more time, after which the funnel 13 is removed and the vacated hole 9 is closed with the second stopper 17.

3-5 minutes after the completion of filling the sealant 12 into the sleeve 1 and plugging the holes 9 and 10 with the plugs 17, the process of self-expansion of the sealant 12 in the cavity 5 of the sleeve 1 begins. Due to the good initial fluidity, the sealant penetrates between the cores in the cable core and between the intergrowths of the cores. When the entire free volume in the coupling 1 is filled with sealant 12, a compression effect begins, in which the pressure on the walls of the coupling gradually increases and reaches 0.3-0.4 kgf / cm ² - a sufficiently good seal of the cable core splice occurs.

Thus, the claimed method of restoring the clutch “cable lock” of the cable communication line is simple to implement, eliminates the use of expensive equipment, and the need to maintain the operating state of the installation, i.e. excludes the operation of removing the thickened sealant from the installation nodes in contact with the sealant. In addition, it should be noted that during the polymerization (thickening) of the Pulast sealant, its electrical insulating characteristics increase. Only in the first two days after the recovery process, the electrical insulation resistance of the cable cores increases significantly, from kOhm values to MΩ values, which allows you to reanimate a "jammed" cable line. In this case, the Pulast sealant, during prolonged contact with the polyethylene insulation of the cores, does not cause cracking of the polyethylene sheath of the cable cores and thereby eliminates its damage, leading to further “jamming” of the communication cable.

Information sources

1. Telecommunication cables, Yu.A. Parfenov, M., Eco Trends-Elike, 2003, pp. 219-228.

Claims (1)

A method for restoring a clutch of a damaged “chamfered” cable communication line, including disassembling and depressurizing the clutch with the release of splices of the cable ends, removal of moisture from the cavity of the sleeve and splices of the cable ends, making a technological hole on each of the two components of the coupling body and subsequent mounting of the coupling with the lengths of the cable ends, after which the entire free volume of the coupling cavity is filled with a two-component liquid hydrophobic filler through one of the technological holes d, moreover, the components of the liquid hydrophobic aggregate are mixed immediately before its use, characterized in that after removing moisture from the coupling cavity, the remaining moisture from the splices of the ends of the cable is removed by blotting, followed by drying with hot air for an hour at a temperature of 60-70 ° C, and as a liquid hydrophobic two-component aggregate, a Pulast sealant based on a polyurethane base is used.

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