JP2570972Y2 - Sheet for wire connection processing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet used for water-tightening a wire connection.

[0002]

2. Description of the Related Art In a wire connection portion, it is necessary to secure insulation properties.
Water-tightening treatment is indispensable for preventing corrosion of conductors.
Particularly in underground and overhead distribution lines, strict watertight treatment is required since tension and corrosion act simultaneously and cause stress corrosion.

[0003] For the watertight treatment of the electric wire connection portion, a structure is usually used in which a single-sided adhesive insulating tape is spirally wound around the electric wire connection portion with the adhesive surface facing inward.

However, in this structure, the single-sided adhesive insulating tape has to be wound many times around the wire connection part, and there is a problem in workability. Further, since there are a large number of wrapped portions of the single-sided adhesive insulating tape at intervals of the spiral pitch, there is a problem in reliability with respect to watertightness.

[0005] In the applicant, as a watertight treatment structure of the disconnection connection portion, a seal with a viscoelastic seal material provided on one surface of a waterproof sheet slightly wider than the wire connection portion. −
It has already been proposed to wind the wire over the wire connection with the viscoelastic seal material side facing inward. In this structure,
Unlike the case of winding an adhesive insulating tape, the number of times of winding a sheet with a seal material can be significantly reduced.
Excellent workability.

[0006]

However, in order to prevent leakage of the seal material from the sheet end due to pressurization,
A viscoelastic material having a relatively high modulus of elasticity is used for the seal material. If the step between the wire core and the sheath at the end of the wire connection increases, the viscoelastic seal material is used. It is difficult to adhere to the step, and there is a problem of watertightness.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a waterproof sheet provided with a viscoelastic seal material on one side thereof, wherein the viscoelastic seal material is provided at a stepped portion between the electric wire core and the sheet. It is an object of the present invention to provide an electric wire connecting part processing sheet which can be securely brought into close contact with the electric wire.

[0008]

Wire connecting portion processing sheet of the present invention SUMMARY OF THE INVENTION, in sheet provided with a viscoelastic sealant on one side of the waterproof sheet, the waterproof sheet, have a stretch of 50% or more, The configuration is characterized by using an extensible sheet that changes color by elongation.

[0009]

[Function] The desired tension is applied to the waterproof sheet.
It can be confirmed by the discoloration of the sheet.
As a result , the viscoelastic seal material can be securely adhered to the step between the sheath of the electric wire core at the end of the electric wire connection portion, so that the adherence of the viscoelastic seal material to the step can be reliably achieved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a plan view showing an embodiment of the present invention.
(B) is a cross-sectional view taken along the line (b) of FIG.
In FIGS. 1A and 1B, reference numeral 1 denotes a waterproof sheet, which is discolored by elongation , and is at least 50%
Preferably, an extensible sheet having an elongation of 100 to 2000% (elongation at break) is used. Waterproof sheet
The reason why the elongation of 1 is 50% or more is that if it is less than 50%,
This is because the action described above cannot be achieved satisfactorily. This sheet
1 is that the part receiving the tension is whitened or crystalline
Use a plastic sheet that changes color due to changes in
be able to. Reference numeral 2 denotes a waterproof sheet 1 on one side thereof.
A viscoelastic sealing material provided except for the four sides, which has a higher elastic modulus than a normal putty-like sealing material, is used.

In order to process the electric wire connection part by the electric wire connection part processing sheet A, the sheet A is treated with a viscoelastic sheet.
The metal material 2 is stuck on the wire connection part facing inward,
In this case, as shown in FIG. 2, a tension δ in the circumferential direction of the wire is applied to the waterproof sheet 1 so that the wire core 3 and the wire core 3 at the end of the wire connection portion are sealed.
And a viscoelastic seal material part 2 immediately above the step
Is pressed by the pressure P generated based on the sheet tension δ, and the viscoelastic seal material 2 is brought into close contact with the step without leaving a gap.

At this time, since the sheet 1 has an extensibility of at least 50% or more and can be sufficiently stretched, it can be adapted well to the step portion, and the viscoelastic sealing material 2 can be closely adhered to the step portion. In addition, for the purpose of this sheet Zhang force, waterproof sheet 1
Is discolored due to elongation or whitening or change in transparency, the brightness and saturation of the waterproof sheet 1 change, and it can be easily confirmed that tension is applied to the waterproof sheet 1 with the naked eye. Adhesion of the viscoelastic sealing material 2 to the step can be reliably achieved.

As the viscoelastic seal material 2, it is preferable to use a material having a relatively high elastic modulus in order to prevent the viscoelastic seal material from being pushed out from the end of the waterproof sheet. Its preferred elastic modulus is 0.005 to 10 kg / mm ² (tensile speed 100 mm / min). It is also important that the viscoelastic seal material 2 does not easily flow at the operating temperature and has no corrosiveness. For example, a material mainly containing butyl rubber or silicon rubber can be used.

As the waterproof sheet 1, a plastic sheet containing a filler so as to easily cause whitening can be used.

It is also possible to use a single-sided adhesive sheet for the waterproof sheet 1 and provide a viscoelastic seal material 2 on one side thereof, leaving four sides. Also, as shown in FIG.
A viscoelastic seal material 2 may be provided on one side of the sheet (which may be one-sided adhesive) 1, leaving both ends, or a viscoelastic seal material may be provided on the front side of one side of the waterproof sheet. It may be provided.

FIG. 4 shows an electric wire connecting portion processed by the electric wire connecting portion processing sheet according to the present invention. See
A is covered by winding (a so-called roll winding) or by longitudinal attachment. The distance b between each end of the coated electric wire connection processing sheet A and the stripped end 41 of each electric wire is usually 3 mm to 40 mm, which is considerably short. As described above, since each of the sheath ends 41 is well watertight with the viscoelastic seal material 2, the watertightness can be sufficiently ensured.

The electric wire connection sheet of the present invention can be used for connection of electric wire sheaths in addition to electric wire conductor connection parts. In this case, the sheath portion is peeled off at the sheath damaged portion of the electric wire, and the electric wire connection sheet of the present invention is coated on the outside of the sheath portion over the stripped end.

[0018]

The sheet for processing the electric wire connection part of the present invention has the same structure as described above, and when the electric wire connection part is coated with tension, the viscoelastic sheet is stretched by the extension of the waterproof sheet. The wire material is pushed into the step between the wire core and the sheath at the wire connection end, and can be securely adhered to each other without leaving a gap. Therefore, even if a viscoelastic seal material having a relatively high elastic modulus is used, water tightness can be well ensured, and the use of such a high elastic modulus viscoelastic seal material allows the waterproof seal sheet to be protected from the end. It is possible to provide a practical sheet material which can eliminate the outflow of the seal material and can make the electric wire connection portion watertight by a simple process such as roll winding or vertical attachment.

[Brief description of the drawings]

FIG. 1A is a plan view of an embodiment of the present invention, and FIG. 1B is a cross-sectional view of FIG.

FIG. 2 is an explanatory view showing a watertight state of an end of an electric wire sheath according to the present invention sheet.

FIG. 3 is a plan view of another embodiment of the present invention.

FIG. 4 is an explanatory view showing an electric wire connection portion processed in the present invention sheet.

[Explanation of symbols]

 1 Waterproof sheet 2 Viscoelastic seal material

Claims (1)

(57) [Scope of request for utility model registration] 1. A sheet provided with a viscoelastic sealant on one side of the waterproof sheet, the waterproof sheet, have a stretch of 50% or more, characterized by using an extensible sheet that changes color by elongation Sheet for wire connection processing.