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

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

 

The invention relates to the field of repair of cable lines laid in the ground all categories in cable ducts, sewers and tunnels.

The known method of repairing [1] [2] lead couplings in aluminium sheath of communication cable, wherein the aluminum shell salivette zinc-tin solder by CSC-40, and coupling soldered thereto tin-lead solder will Passu 30-2, which should ensure its integrity.

The disadvantage of this method is the short term tightness of the coupling as a result of inability to provide high quality soldering and occur at the interface of dissimilar metals (aluminum, lead) electrochemical corrosion. In addition, to improve the quality of brazed connections have to increase the time of soldering, which leads to the destruction of the insulation of the conductive wires in the cable.

The average term integrity of such initially installed or repaired clutch does not exceed 2-3 years.

After soldering a lead coupling the restoration of the outer integument (plastic hose) is either injured as a result of dismantling the plastic coupling or winding various ribbons, which in both cases may not provide a reliable water resistance. In addition, after three opening pole Elenovo clutch it becomes unsuitable for further use.

The technical result of the invention is to improve the quality of repair couplings on existing communication cables alumina-PE sheath without gap, i.e. without interruption of communication, and increase the service life of the coupling due to the exclusion of electrochemical corrosion.

This technical result is achieved in that in the method of repair coupling for the connection cables with aluminum shell and plastic protective hose, namely, that zalizivaut aluminum sheath cable solder and perform the soldering of the lead coupling, first on the aluminum sheath of each cable set split lead sleeve that you solder to the honored sites aluminum shell, simultaneously producing the sealing of the longitudinal seam on the sleeves, the ends of the sleeves seal heat shrink tape, the clutch is set on the cluster and you solder it to the bushes.

To restore the outer protective hose onto the coupling and the adjacent parts of the cable sealing mastic and bandage moisture curing.

The invention is illustrated figure 1 and figure 2, which depicts renovated lead coupling with and without a means to restore the exterior of the hose, respectively.

When the failure and repair leaking clutch flame soldering La the dust or gas burners melt the solder joints lead coupling, aluminium shell and remove all the solder. Cones lead coupling resultshowever so that the clutch can be shifted left or right on the cable mounted through the core. Place the soldering of the lead coupling is again heated by an open flame and carefully cleaned cord brush. Free cluster of veins open and repair, if necessary, and then restore over him waist isolation.

When performing repairs on aluminum shell, 1 cable 2 set the split lead sleeve 3 with a longitudinal slit 4. By chasing achieve a snug fit of the sleeve 3 aluminum shell 1. If necessary, excess lead is removed with a knife in longitudinal section that is flexible sleeve. Achieving a tight fit of the sleeve 3 aluminum shell 1 on both edges of the longitudinal slit along the entire length, chamfer at an angle of 30° and the whole sleeve 3 smooth out the metal cord brush. Next, the sleeve 3 mounted on an aluminum shell 1 made earlier marks. Similar operations are performed on the other end of the cable. To provide electrical connections aluminum shell two construction cable lengths both lead sleeve 3 to move along the cables in the direction of the cluster of 12 lived. Vacant parcels aluminum shell 2/3 the circumference zalizivaut solder CSC-40 and sleeve set pre is the place. Then the sleeve 3 you solder honored to sections aluminum shell 1 by the solder 5, for example, will Passu 30-25. At the same time produce the longitudinal sealing seam 4 on sleeves. Both of these operations are performed without using a flux.

Next on the lead sleeve 3 from both sides (one side on top of the solder and the aluminum shell to cut polyethylene (PE) hose glue-melt 6, for example, CR-1. Especially abundant are doing in the junction of the sleeves 3 and the shell 1 cable 2. On top of the glue melt reel with 50%overlap one layer of two-layer termousazhivaemoy tape 7, for example, "Raglan", and is sealed lead bushings on both sides.

So have two platforms (lead sleeve 3) for soldering the lead of the coupling 8. Then the sleeve 8 to move and set on a cluster of 12. The ends of the clutch 8 by stamping line along the diameter of the lead bushing 3 and you solder to solder them will Passu 30-2 using flux 9. When soldering the lead of the coupling 8, the winding of the tape "Raglan" it is advisable to protect multiple layers of steklolenta.

Thus, it is a reliable sealing of the splice 12 wires cable 2.

In case of necessity of opening the clutch 8 should respati it, razvalivat and move along the cable 1.

To restore the outer protective hose (see figure 2) use sealant m is the stick 10, for example, MG 14-16 and bandage moisture curing 11, for example, "Armorplast" [3].

Thus, using the proposed method allows to increase the safety of the cable core in the place of installation, improves the quality and reliability of the couplings during the whole period of their operation, which can reach up to 25 years.

Sources of information

1. Guidance on the construction of linear facilities of the main and intraareal cable lines, Moscow, Radio I Svyaz, 1986.

2. Temporary instruction on installation of communication cables with aluminum shell brands Csasp, Csabp, Sabpp, Moscow, SCTB, 1983.

3. Manual sealing couplings, shells and hoses communication cables "cold method", Moscow, SSCTB-THOMASS, 1999.

1. The repair method of connecting a lead coupling on the communication cables with aluminum shell and plastic protective hose, in which the Assembly of the connecting lead clutch shift left or right on the cable mounted through the core, pre-melted the solder joints and rezvantseva cone clutch, the solder joints again warm up and smooth out, zalizivaut aluminum shell, install, zachekanivajut and you solder the split lead sleeve honored to sections aluminum shell, simultaneously producing the sealing food is inogo seam on sleeves, the ends of the sleeves seal heat shrink tape, connecting lead clutch set above a mounted core Zaccaria the diameter of the bushings and you solder it to the hub, then on the sleeve and the aluminum shell to cut the plastic protective hose put glue melt, over which is wound with 50% overlapping of the single layer heat-shrinkable tape that provides sealing bushings on both sides.

2. The method according to claim 1, characterized in that the mounted core if necessary, open and repair, then restoring over him waist isolation.

3. The method according to claim 1, characterized in that the recovery of polyethylene protective hose onto the coupling and the adjacent parts of the cable sealing mastic and bandage vlagootverzhdaemykh.



 

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

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