JPH0549137A - Method of removing water-tight cover of cable connection - Google Patents

Abstract

PURPOSE:To enable a cover to be removed safely and simply with a knife by forming a guide groove for a knife at the cover which becomes water-tight by catching the connection of a cover cable with a cover where wafer-proof admixture layers are provided on the inner side faces of both ends. CONSTITUTION:Swelling sidewalls 12 are provided on both sides of the center fold 1 of a plastic cover body 1, and a knife guide groove 13 is made in advance, at least, on one sidewall 12. Viscoelastic waterproof admixture layers 2 are provided on the inner side faces of both ends of the sidewall 12, and lugs 14 are provided on both sides. The connection or the branch connection of a covered cable is caught by folding the cover body 1 at the center fold 11, and the water-proof admixture layers 2 are force-bonded, and the fellow lugs 14 are bonded with an adhesive to form a water-tight cover. When opening the water-tight cover for inspection and maintenance, a knife is shifted along the guide groove 13. Hereby, the cover is opened safety and easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a watertight cover from a connection portion of an overhead distribution line which is watertightly protected by the cover.

[0002]

2. Description of the Related Art In order to prevent stress corrosion of a copper conductor of an overhead distribution line, it is necessary to use a covered wire for the electric wire and to make the electric wire connection part a watertight structure to shield the copper conductor from moisture and water.

However, in the connecting portion of the electric wire, in the branch connecting portion, the outer surface shape is complicated and the unevenness is severe,
Watertightening treatment is difficult with a normal tape winding method. In order to eliminate such absurdity, a cover method using a waterproof mixture having viscoelasticity as a seal material has been proposed.

In order to make the branch connection portion of the electric wire watertight by this cover method, as shown in (a) of FIG. 1 and (b) of FIG. 1, a folding line 11 is provided at the center, The fold line 11 is sandwiched and bulging side walls 12, 12 are provided on both sides of the folding line 11.
On the inner side surfaces of both ends of the cover body 1 provided with ears 14 and 14 on 2,12, waterproof mixture layers 2 and 2 having viscoelasticity are provided, and the cover body 1 is centered as shown in FIG. The folding wire 11 is bent to be joined to the branch connection portion, the ears 14 and 14 are bonded with the adhesive 15, and the waterproof admixture layer 2 is pressure-bonded to the coating layers of the electric wires 30 and 31.

In this case, since the conductor connecting portion can be covered with water from the outside by the cover, it is not necessary to provide taping on the conductor connecting portion. Therefore, the water-tightening treatment of the wire connection portion can be performed in a shorter time than in the case of taping, and moreover, even if the shape of the conductor connection portion is complicated, sufficient water-tightness can be guaranteed.

[0006]

By the way, it is often necessary to remove the above-mentioned cover for maintenance and inspection of the electric wire connection portion, and in many cases it is required to remove it under a live line. . Therefore, the waterproof admixture layer in the cover system has a strong adhesive force,
It is difficult to remove the cover 1 due to the openings of the adhered ears 14 and 14, and in particular, it is impossible to use a large tool because it is a fictitious construction.

Therefore, it is conceivable to incise the cover with a knife. However, since the electric wire conductor connecting portion in the cover is in a bare state and there is a sufficient possibility of contact between the knife and the electric wire conductor connecting portion, It is extremely dangerous for hot line construction.

An object of the present invention is to provide a method for safely and easily removing a cover, which is attached to an imaginary electric wire connection portion through a waterproof mixture layer having viscoelasticity, by using a handy knife. It is in.

[0009]

A method of removing a watertight cover of an electric wire connecting portion according to the present invention is a method of tying a covered electric wire connecting portion with a cover provided with a waterproof admixture layer on the inner side surfaces of both end portions to form a cover. A groove for knife guide is formed in the cover of the electric wire connecting portion in which the waterproof admixture layer is closely adhered between the cover and the covered electric wire, and the knife is moved along the groove to move the cover.
This is a configuration characterized by making an incision.

[0010]

By operating the knife along the knife guide groove of the cover, the cover can be easily incised.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In order to carry out the present invention, it is necessary to form a knife guide groove in the cover. FIG. 1 (A) shows the developed state of the cover used in the present invention, and FIG. In FIGS. 1A and 1B, 1 is a cover made of plastic (for example, polyethylene resin, polystyrene resin, polypropylene resin, ABS resin).
It is the main body, and the bulging side walls 1 on both sides of the center folding line 11
2, 12 are provided, and a groove 13 for knife guide is formed on at least one side wall portion. 14, 14 are ears provided on the side wall portions 12, 12. Reference numerals 2 and 2 denote waterproof mixture layers having viscoelasticity provided on the inner side surfaces of both ends of the cover body 1, for example,
Butyl rubber, ethylene-propylene-terpolymer, or the like having a rubber as a main component can be used.

FIG. 2 shows a branch connection portion of an electric wire watertightly covered by the cover. The coating layer of the main wire (covered wire) 30 is peeled off to expose the conductor of the main wire, and the exposed conductor is branched off (covered). (Wire) 31 is connected by a conductor connecting metal fitting, the cover 1 is bound on the conductor connecting portion by bending the central folding line 11, and the ears 14, 14 are bonded by an adhesive 15. In addition, the waterproof admixture layer 2 is pressed and adhered to the outer surface of the coating layer of each electric wire.

According to the present invention, in order to remove the cover-1, the knife is moved along the knife guide groove 13 of the cover-1, the cover-1 is incised, and the cut-out cover is a waterproof mixture. Remove from the wire connection against the adhesion of layer 2.

In the above, the knife is a groove for knife guide.
We proceed while cutting the bottom of 13. In order for the knife to cut and advance along the path deviated from the knife guide groove 13, the rising portion of the groove 13 (indicated by 131 in FIG. 3) must be cut. Since the blade edge of the knife, which is horizontal to the blade edge and is normally in the knife guide groove 13, does not bite into the rising side surface, the knife can be moved without diverting from the knife guide groove 13. Therefore, by setting the knife guide groove 13 so as to pass through the position on the cover surface which is sufficiently separated from the conductor connecting portion, it is possible to prevent the knife from coming into contact with the conductor connecting portion.

In the above description, as shown in FIG. 3, the cross section of the knife guide groove 13 can be inclined at a predetermined angle θ with respect to the cover surface. Even if it is deep, it is possible to avoid contact with the conductor connection portion of the knife, and it is possible to use a long knife.

In the present invention, the length of the knife guide groove does not necessarily need to extend over the entire length of the cover. As shown in FIG. 4, the knife guide groove 13 is formed in the waterproof admixture layer 2,
It is also possible to provide it excluding the portion of 2. In this case, it is possible to eliminate the need to insert a knife into the waterproof admixture layers 2 and 2, and to cut the knife guide groove 13 with the knife to prevent the admixture of the waterproof admixture from the knife, and to cut the middle portion of the cover. Can be smoothly incised. After the incision of the intermediate portion, both ends are incised while expanding the intermediate portion. By doing so, it is possible to prevent re-adhesion of the incision surface of the once-dissected viscoelastic waterproof admixture layer, and to eliminate the trouble of re-incision.

The watertightness of the electric wire connecting portion by tying the cover can be applied to the linear connecting portion of the electric wire, and the present invention can also be used for removing the cover of the linear connecting portion.

[0018]

The watertight cover of the electric wire connecting portion according to the present invention.
The removal method of the above is the configuration as described above, and the cover which is bound to the electric wire connecting portion through the waterproof mixture layer having viscoelasticity is contacted with the knife by the knife with the bare conductor connecting portion in the cover. Since the cover can be incised without fail and the cover can be opened and removed, the cover can be easily removed even if the adhesive strength of the waterproof admixture is strong or the scaffolding is unstable. In addition, it can be safely removed even under a hot line.

[Brief description of drawings]

FIG. 1A is a cover used in the present invention.
An explanatory view showing an example, and (b) of FIG. 1 is a cross-sectional view taken along the line (a) of FIG.

FIG. 2 is an explanatory diagram showing an example of an electric wire connecting portion in which the present invention is used.

FIG. 3 is an explanatory view showing a knife guide groove of the cover used in the present invention.

FIG. 4 is an explanatory view showing a knife guide groove of a cover different from the above used in the present invention.

[Explanation of symbols]

 1 Cover 13 Knife guide groove 2 Waterproof mixture layer 30 Electric wire. 31 electric wire

Claims (1)

[Claims] 1. An electric wire connecting portion in which a covered electric wire connecting portion is bound by a cover provided with a waterproof admixture layer on the inner side surfaces of both ends, and the cover and the electric wire are closely adhered by the waterproof admixture layer. 2. A method for removing a watertight cover of an electric wire connecting portion, characterized in that a groove for knife guide is formed in the cover, and the knife is moved along the groove to cut the cover.