JP2000037022A - Armor rod and its winding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent corona from being induced by providing at least one projecting part and at least one recessed part at an outer periphery. SOLUTION: When an armor rod 10 is to be wound around an electric wire 20, a projecting part 11 of the armor rod 10 is fitted to a recessed part 12 of the adjacent armor rod 10. Each projecting part 11 and recessed part 12 are provided at positions where a terminal 13 of each armor rod 10 is nearly aligned when the armor rod 10 is wound, thus suppressing the deviation of a plurality of armor rods 10 being wound around the specific position of the electric wire 20 in its longer direction and aligning the terminal 13. Also, the deviation of the armor rods 10 being wound in this manner can be essentially prevented even if the electric wire 20 is exposed to wind and rain, thus suppressing the induction of corona caused by the misalignment of the terminal 13 of the wound armor rods 10 and improving the noise of televisions and radios.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armor rod for winding around an electric wire such as a power transmission line to protect the electric wire.

[0002]

2. Description of the Related Art In many cases, a protective armor rod is wound around a gripping portion of an electric wire such as a power transmission line for the purpose of suppressing vibration fatigue and preventing fusing. The armor rod is made of a wire material having a diameter approximately equal to that of a wire constituting the electric wire, and a plurality of the armor rods are attached by being wound around the electric wire. Usually, the armor rod wound around the grip portion of the electric wire or the like is about one circumference of the electric wire or more.

[0003]

The work of winding the armor rod is usually performed manually. For this reason, the plurality of armor rods are not aligned in the longitudinal direction, and are likely to be irregular at the terminal. Therefore, in the winding operation, for example, a mark or the like is attached to each armor rod, and while checking it visually, the terminals of a plurality of armor rods are arranged.

[0004] However, the work of winding the armor rod around the electric wire is usually performed on an overhead transmission line on which the scaffold is unstable. Alignment was not easy.

[0005] In addition, even if the ends of the armor rod are aligned to some extent in the early stage of winding, the ends of the wound armor rod may shift due to the influence of external force such as wind and rain on the wire on which the armor rod is wound. there were.

[0006] It is known that when the wound armor rod is displaced in the longitudinal direction and its terminals are not aligned, corona is likely to occur due to the influence. That is, corona is easily induced at a lower voltage. The occurrence of corona has also caused noise on televisions and radios, and improvements have been required.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made to provide an armor rod which is less likely to be displaced in the longitudinal direction. We have also invented a method of winding an armor rod that is less likely to shift in the longitudinal direction. That is, the armor rod of the present invention has at least one convex portion and at least one concave portion on the outer periphery.

When a plurality of the armor rods of the present invention are wound around an electric wire, the convex portions and the concave portions of the adjacent armor rods fit each other. With this configuration, it is possible to perform winding with little displacement in the longitudinal direction. The length of the above-mentioned armor rod is, for example, at least one circumference of the electric wire around which the armor rod is wound.

In addition, a method for winding an armor rod is proposed. That is, a clamp is attached near one end of a place where the armor rod of the electric wire is wound, and the armor rod is wound around the electric wire while abutting the tip of the armor rod against the clamp, thereby reducing the terminal displacement of the armor load. It is a method of suppressing. By this method, it is possible to perform winding with little deviation in the longitudinal direction.

[0010]

FIG. 1 is an explanatory view showing an example of an armor rod of the present invention. The armor rod 10 is made of a single wire, and has at least one convex portion 11 and one concave portion 12 on its outer periphery. The illustration of the convex portion 11 and the concave portion 12 is simplified. The material of the armor rod 10 may be variously selected according to the type of the electric wire around which the armor rod 10 is wound. For example, the same material as the electric wire or a material coated with a resin such as nylon, Teflon, or silicon may be used. good.

The armor rod 10 is wound around an electric wire 20 as shown in FIG. Although the electric wire 20 is in the form of a stranded wire, illustration of the stranded wire form is omitted in this figure for simplification. Further, the armor rod 10 wound around the electric wire 20 is usually wound to such an extent that the electric wire 20 at that portion is hidden, but only three armor rods 10 are shown in this figure.

Now, when winding the armor rod 10 around the electric wire 20, as shown in FIG.
And the other armor rod 10 adjacent thereto
With the concave portion 12 of FIG. Each of the projections 11 and the depressions 12 is provided at a position where the ends 13 of the armor rods 10 are substantially aligned when the armor rods 10 are wound as shown in FIG.

In this way, the displacement of the armor rods 10 wound around the predetermined portions of the electric wire 20 in the longitudinal direction is suppressed, and the terminals 13 are substantially aligned. The armor rod 10 wound in this manner is connected to the electric wire 20.
Even if the head is subjected to an external force such as exposure to wind and rain, the displacement can be substantially prevented. Therefore, the induction of corona due to the unevenness of the terminals 13 of the wound armor rod 10 is suppressed, and the problem of causing noise in television and radio is greatly improved.

FIG. 3 is a diagram illustrating a method of winding an armor rod according to the present invention. A simple clamp 32 is attached to the electric wire 30 around which the armor rod 31 is wound. Reference numeral 320 in the figure is a bolt. When the armor rod 31 is wound around the electric wire 30, the end of the armor rod 31 can be suppressed by abutting the end thereof. The attachment position of the clamp 32 is set to the terminal position of the armor rod 31 to be wound, and the clamp 32 is removed after the armor rod 31 is wound. The clamp 32 of the present invention
May be any as long as it plays a role of aligning the terminals by abutting the tip of the armor rod 31 as described above, and is not limited to the illustrated form.

According to such a method, the armor rod 31 can be wound while substantially preventing the longitudinal shift of the armor rod 31, the induction of corona due to the uneven ends of the wound armor rod 31 can be suppressed, and the television and the The problem of causing radio noise is greatly improved.

[0016]

As described above, the armor rod of the present invention can substantially prevent the displacement in the longitudinal direction, and can suppress the corona induction due to the irregular end of the wound armor rod. For this reason, the problem of causing noise of television and radio is greatly improved. Further, the armor rod of the present invention is hardly displaced even when an external force is applied after being wound, and the terminals of the armor rod are unlikely to be uneven.

According to the armor rod winding method of the present invention, the armor rod can be simply wound while substantially preventing the displacement in the longitudinal direction.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an armor rod of the present invention.

FIG. 2 is an explanatory diagram showing a state in which the armor rod of the present invention is wound around an electric wire.

FIG. 3 is a diagram illustrating a method of winding an armor rod according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Armor rod 11 Convex part 12 Concave part 13 Terminal 20 Electric wire 30 Electric wire 31 Armor rod 32 Clamp 320 Bolt

Claims (3)

[Claims] 1. An armor rod having at least one protrusion and at least one recess on an outer periphery. 2. The armor rod according to claim 1, wherein, when a plurality of the armor rods are wound around an electric wire, a convex portion and a concave portion of the adjacent armor rods fit each other.
The armor rod as described. 3. An armor load of the armor load is provided by attaching a clamp near one end of a place where the armor rod of the electric wire is wound, and winding the armor rod around the electric wire while abutting the tip of the armor rod against the clamp. An armor rod winding method that suppresses terminal displacement.