RU2246158C2 - Method for repairing lead junction boxes of aluminum-sheathed and polythene-hosed communication cables - Google Patents

Abstract

FIELD: repairs of communication line cables laid in soils of all kinds in cable conduits, manifolds, and tunnels.

SUBSTANCE: proposed method includes installation of split lead bushing on aluminum sheath of each cable followed by shifting both bushings along cables away from spliced joint of cable conductors, running exposed sections of aluminum sheath over with tin, fitting bushings back in place, and soldering them to tinned sections of aluminum sheath; at the same time longitudinal seam on bushings is soldered, ends of bushings are sealed by thermosetting tape, junction box is installed above spliced joint, and its butt-ends are soldered to bushings. In order to repair outer shielding hose, junction box and adjacent cable sections are covered with sealing compound and moist-cured bandage.

EFFECT: improved repair quality, enhanced service life of junction box due to elimination of electrochemical corrosion.

3 cl, 1 dwg

Description

The invention relates to the field of repair of cable communication lines laid in soils of all categories in cable ducts, collectors and tunnels.

A known method of repair [1] [2] lead-on couplings on the aluminum sheath of communication cables, in which the aluminum sheath is tinned with zinc-tin solder TsOP-40, and the sleeve is soldered to it with tin-lead solder POSSU 30-2, which should ensure its tightness .

The disadvantage of this method is the short tightness of the coupling as a result of the inability to ensure high quality soldering and the occurrence of dissimilar metals (aluminum, lead) at the junction of electrochemical corrosion. In addition, to improve the quality of the soldered connection, it is necessary to increase the soldering time, which leads to the destruction of the insulation of the conductive conductors in the cable.

The average tightness period of such an originally mounted or repaired coupling does not exceed 2-3 years.

After soldering the lead sleeve, the restoration of the outer cover (polyethylene hose) is carried out either by a plastic sleeve injured as a result of dismantling, or by winding with various tapes, which in both cases cannot provide reliable waterproofness. In addition, after opening the polyethylene sleeve three times, it becomes unsuitable for further use.

The technical result of the invention is to improve the quality of repair of couplings on existing communication cables with an aluminum-polyethylene sheath without rupture, i.e. without interruption of communication, and increased service life of couplings due to the exclusion of electrochemical corrosion.

The specified technical result is achieved by the fact that in the method of repairing the coupling on the communication cables with an aluminum sheath and a polyethylene protective hose, which consists in tinning the aluminum sheath of the cables with solder and soldering the lead sleeve, first, a split lead sleeve is installed on the aluminum sheath of each cable, which is soldered to the tinned sections of the aluminum shell, while sealing the longitudinal seam on the bushings, the ends of the bushings are sealed with heat-shrinkable tapes oh, the clutch is mounted over the splice and soldered to the bushings.

To restore the outer protective hose, a sealing mastic and a moisture-curing bandage are applied to the coupling and adjacent cable sections.

The invention is illustrated in figure 1 and figure 2, which depicts a repaired lead sleeve without and with means for restoring the outer hose, respectively.

When repairing a failed seal, the flame of a blowtorch or gas burner melts the solder points of the lead sleeve to the aluminum shell and removes all the solder. The cones of the lead sleeve are expanded so that the sleeve can be moved left or right on the cable through the mounted core. The solder points of the lead sleeve are once again heated with an open flame and thoroughly cleaned with a cord brush. The free splicing of veins is opened and repaired, if necessary, and then belt isolation above it is restored.

When performing repairs, a split lead sleeve 3 with a longitudinal section 4 is installed on the aluminum sheath 1 of cable 2. By coining, a sleeve 3 is tightly mounted on the aluminum sheath 1. If necessary, excess lead is removed with a knife in a longitudinal section, which is the universality of the sleeve. Having achieved a tight fit of the sleeve 3 on the aluminum shell 1 on both edges of the longitudinal section along the entire length, the bevel is removed at an angle of 30 ° and the entire sleeve 3 is cleaned with a metal cord brush. Next, the sleeve 3 is installed on an aluminum shell 1 according to previously made marks. Similar operations are performed at the other end of the cable. To ensure electrical connection of the aluminum sheath of the two building lengths of the cable, both lead bushings 3 are shifted along the cables in the direction from the splice 12 of the cores. The freed sections of the aluminum shell on 2/3 of the circumference are tinned with solder TsOP-40 and the bushings are installed in their original places. Then the sleeve 3 is soldered to the tinned sections of the aluminum shell 1 with solder 5, for example, POSSU 30-25. At the same time, a longitudinal seam 4 is sealed on the bushings. Both of these operations are performed without the use of flux.

Next, on lead sleeves 3 on both sides (on one side over soldering) and the aluminum shell, hot melt adhesive 6, for example, KR-1, is applied to cut the polyethylene (PE) hose. This is done especially abundantly at the junction of the bushings 3 with the sheath 1 of the cable 2. On top of the melt adhesive, one layer of double-layer heat-shrink tape 7, for example, "Radlen", is wound with 50% overlap, and lead bushings are sealed on both sides.

Thus, two platforms (lead sleeves 3) are made for soldering the lead sleeve 8. Then the sleeve 8 is shifted and mounted over the splice 12. The ends of the sleeve 8 are chased along the diameter of lead sleeves 3 and soldered to them with POSS 30-2 solder using flux 9. When soldering lead sleeve 8, it is advisable to protect the winding from the "Radlen" tape with several layers of glass tape.

Thus, reliable sealing of the splice of 12 cores of cables 2 is made.

If it becomes necessary to open the sleeve 8, you should unsolder it, expand it and slide it along the cable 1.

To restore the outer protective hose (see figure 2), use sealing mastic 10, for example, MG 14-16 and a moisture-curing bandage 11, for example, Armoplast [3].

Thus, the use of the proposed method allows to increase the safety of the cable core at the installation site, improves the quality and reliability of the couplings during the entire period of their operation, which can reach 25 years.

Information sources

1. Guide to the construction of linear structures of trunk and intrazonal cable communication lines, Moscow, Radio and communications, 1986.

2. Temporary instructions for installing communication cables with an aluminum sheath of TZASHp, TZABp, TZABpShp brands, Moscow, SSKTB, 1983.

3. Guidelines for the sealing of couplings, sheaths and hoses of communication cables "cold", Moscow, SSKTB-TOMASS, 1999.

Claims (3)

1. A method of repairing a lead lead coupler on communication cables with an aluminum sheath and a polyethylene protective hose, in which the depressurized lead lead coupler is moved left or right on the cable through the mounted core, having previously melted the soldering places and expanding the coupling cones, the soldering places are once again heated and cleaned , tin the aluminum shell, install, chip and solder the split lead bushings to the tinned sections of the aluminum shell, while producing soldering of the longitudinal seam on the bushings, the ends of the bushings are sealed with a heat-shrinkable tape, the connecting lead sleeve is installed over the mounted core, choked along the diameter of the bushings and soldered to the bushings, then hot-melt adhesive is applied to the bushings and the aluminum sheath, before cutting the polyethylene protective hose, over which they are wound with 50 - a percentage overlap of one layer of heat-shrinkable tape, which provides sealing of the bushings on both sides. 2. The method according to claim 1, characterized in that the mounted core, if necessary, is opened and repaired, then restoring the belt insulation over it. 3. The method according to claim 1, characterized in that to restore the polyethylene protective hose, a sealing mastic and a moisture-curing bandage are applied to the coupling and adjacent cable sections.

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