JPH02179214A - Waterproofing method for joint - Google Patents

Abstract

PURPOSE:To prevent water or other foreign matters from entering a joint by adapting an almost cylindrical protective cover to the waterproofing place of said joint and by winding a sealing tape round the surface of said joint over a specified distance from the end face of the folded protective cover. CONSTITUTION:A protective cover 100 formed by an almost cylindrical elastic material is equipped with a first end 101 and a second end 102 formed with specified inside diameters, and the title method comprises processes for adapting said protective cover 100 to the waterproofing place of a joint, for folding back the first end 101 and the second end 102 of said protective cover 100 to the outside over a specified length, for winding a sealing tape 104 round the surface of said joint over a specified distance from the end face of the folded protective cover 100, and for returning the folded part of said protective cover 100 onto said sealing tape 104. The application of these processes enables completely fixing the protective cover to the joint through a simple work and preventing water or other foreign matters from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for removing ice and other foreign substances from the connecting parts when connecting high-voltage cables such as electric cables (C cables) or other various cables to each other or to terminals of other equipment. The present invention relates to a waterproofing method for preventing water from entering the interior.

Conventionally, various connection methods and devices have been proposed for connection of high voltage cables, and FIG. 4 shows an example of a typical prefabricated connection part for Cv cables currently used. In this example, only one side of the cable to be connected is illustrated, and the other side is omitted.

The terminal portion of the cable C to be connected is subjected to terminal processing for connection work, and the terminal portion of the cable C is sequentially connected from the tip conductor portion 2 to the outer sheath 6. Insulating (cross-linked polyethylene) layer 3. Semi-conducting WJ4. The copper tape layer 5 is exposed, and a stress cone 7 is fitted around the outer periphery of the insulator layer 3.

A conductor connecting fitting 8 is connected to the conductor portion 2 of the cable C which has been terminal-treated in this way, and a center hole 11 of a roughly cylindrical epoxy insulator (insulating bushing) 10 having a shielding tube 9 integrally molded therein. inserted into.

A conductor connection fitting 8 connected to the conductor 2 of the cable C is located within the center hole 12 of the shielding tube 9 and is electrically connected to the other conductor.

On the other hand, the stress cone 7 is pressed by the stress cone pressing means 20.
is urged toward the insulating bushing 10 at. The suppression means 20 abutted the outside of the stress cone. It has a stress cone pusher 22 having a generally truncated cone shape. The metal fitting 22 includes two flanges 24, and guide shafts 26 are provided at a plurality of locations on the flange 24 in the circumferential direction.

Each guide shaft 26 extends in the axial direction of the cable C, and a metal fitting 28 is attached to the tip of the guide shaft 26 by fitting into a hole 30 to attach an annular spring. Further, a compression spring member 32 is disposed between the flange 24 and the spring fitting 28 in such a manner as to surround each kite shaft 26 .

On the other hand, a cable protection fitting 40 having a substantially cylindrical shape is provided, one end of which is a flange 42 extending radially outward, and the flange portion is used to protect the insulating bushing. It is fixed to the end side wall portion of 10 with screws (not shown) or the like. Further, an O-ring seal 44 is disposed on the flange 42 and is attached to the insulating bushing 10 to prevent foreign matter such as water from entering through the part.

An annular shoulder portion 46 is formed on the inner circumference of the other end of the cable protection fitting 40, and the annular spring attachment of the suppressing means 20 abuts against the fitting 28 to compress the spring member 32.

In the connection part configured in this way, the shoulder part 46 of the cable protection fitting 40 is further formed with an opening in order to prevent water, dirt, etc. from entering the inside from the outside through the connection part. A cable protection tube 48 made of metal or plastic is arranged between the end and the cable jacket 6, and both ends of the protector 21f, 848 are fixed with waterproof tape 50.

However, the work of fixing both ends of the protection tube 48 with waterproof tape 50, that is, taping, requires a lot of time and causes a decrease in work efficiency.

Therefore, an object of the present invention is to provide a waterproofing method that can completely prevent water or other foreign matter from entering the connection portion with a simple operation.

The above objects are achieved by a method for waterproofing a connection part according to the present invention. In summary, the present invention includes the following steps: (a) fitting a generally cylindrical protective cover having a first end and a second end formed with a predetermined inner diameter to a portion of a connection portion to be waterproof; ) Step 2 of folding the first and second ends of the protective cover outward over a predetermined length; (c) Wrapping a sealing tape around the surface of the connection part over a predetermined distance from the folded end surface of the protective cover; ( d) A method for waterproofing a connection portion, comprising the step of returning the folded portion of the protective cover to the hill of the sealing tape.

Strut 1 Next, the waterproofing method of the connection part according to the present invention is shown in the drawing 1! II
This will be explained in more detail.

FIG. 1 shows an example of the same pre-knob connection for high-voltage cables as described in connection with FIG. 4, to which the invention is to be applied.

According to the present invention, a general circle as shown in FIG. ,Z
A protective cover 100 made of a shaped elastic material is provided.

The protective cover lOO may have any shape, but in this embodiment, the protective cover 100 is designed to prevent water, dirt, etc. from entering between the open end of the cable protection fitting 40 and the cable jacket 6. The diameter of the end portion 102 adapted to the open end of the cable protection fitting 40 and the diameter of the end portion 102 adapted to the cable jacket 6 are formed to be different.

Further, the protective cover may be made of any elastic material,
For example, ethylene propylene rubber or a heat-shrinkable vinyl tube having a thickness of 2 to 3 mm is preferably used.

According to the present invention, as shown in FIG.
and the other end 102 is elastically fitted to the cable jacket 6 with sufficient length.Then, both ends 1 of the protective cover are
01.102 is folded back to the outside over a predetermined length (extreme) to form the state shown in solid lines in FIG.

Next, the sealing tape 104 is wrapped around the outer peripheral surface of the cable protection fitting 40 over a predetermined distance from the end face of the folded protective cover. The sealing tape 104 may be of any commonly used type; for example, a self-adhesive rubber tape is preferred.

When the wrapping of the sealing tape 104 is completed, the folded portion of the protective cover 100 is returned to its original state so as to cover the sealing tape 104, and is crimped onto the sealing tape 104. Protective cover 10 if necessary
It is also possible to simply wrap a waterproof tape (not shown) over the both end portions of 0 and 102 in the same manner as in the past.

By the above work, the cable protection metal A4 at the joint part is removed.
The protective force between the open end of 0 and the cable jacket 6 is <-1
00, completely preventing wood, dirt, etc. from entering the interior from the outside.

If the mechanical strength of the protective cover 100 is required, a similar conventional cable protection device may be used between the open end of the cable protection fitting 40 and the cable jacket 6, as shown in FIG. After arranging the tube 48 and further providing the protective cover 100 thereon, the protective cover 100 can be attached to the connecting portion in the same manner as described in the above embodiment.

The cable protection tube 48 is fixed at the same time when the protective cover 100 is fixed to the connection portion.

In the above embodiment, the protective cover is described as having a stepped cylindrical shape with different diameters at both ends, but it is also possible to have both ends the same diameter depending on the shape of the connection part to which the protective cover is adapted.

As described above, the method of waterproofing the connection part according to the present invention uses a protective cover and can be completely fixed to the connection part with a simple operation. It has the advantage of being able to completely and easily prevent the intrusion of other foreign substances.

104 Niji ring tape

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a prefabricated high-voltage cable connection to which the waterproofing method according to the present invention is applied, Fig. 2 is a cross-sectional view of a protective cover, and Fig. 3 is a cross-sectional view of another high-voltage cable to which the waterproofing method according to the present invention is applied. FIG. 4 is a sectional view of a conventional prefabricated connection for high-voltage cables. 62 Cable jacket 40; Cable protection fitting 100: Protective cover Figures 2 and 3o. Figure 3 Figure 4 Figure 5゜

Claims (1)

[Claims] 1) (a) A process of fitting a generally cylindrical protective cover having a first end and a second end formed with a predetermined inner diameter to a portion of the connection part that is to be waterproofed; (b) Step of fitting the protective cover of the protective cover to a portion to be waterproofed; a step of folding the first end and the second end outward over a predetermined length; (c) a step of wrapping a sealing tape around the surface of the connection portion over a predetermined distance from the folded end surface of the protective cover; (d) the sealing tape. A method for waterproofing a connection portion, comprising the step of returning the folded portion of the protective cover onto the top of the protective cover.