JPS5893415A - Method of treating snowfall resistance of installed wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a construction method for making existing electric wires less likely to accumulate snow.

It has already been widely adopted in regions with heavy snowfall to run overhead electric wires, and various types of electric wires have been proposed and adopted for this purpose.

However, if there is a lack of capacity in the existing electric wires that are not equipped with anti-snow accretion measures, or if there is a lack of capacity in the existing electric wires 1.
If this happens, or if the existing electric wires themselves become old and need to be replaced, the already proposed snow-resistant electric wires should be selected according to the snow quality of the area where they will be installed. However, if the electric wires themselves are still sufficiently grooved in terms of electrical performance, mechanical strength, etc., it is necessary to apply some kind of snow-repellent means to these existing electric wires.

From this point of view, some devices have already been proposed for this purpose, but for example, when wrapping a wire around an existing electric wire to prevent snow from accreting, it is necessary to use a lashing machine. . However, when using a lashing machine, not only the work is poor, but also the wire surface is damaged by the wire itself.
If there is no force to hold the snow in place, it will loosen and sag, resulting in a poor appearance and no snow-covering effect.

In view of the above-mentioned points, the present invention has been developed to provide a highly elastic exterior for preventing snow accretion, which has an inner diameter slightly smaller than the outer diameter of the electric wire, is formed in advance into an SZ shape, and is made of a dielectric material having a predetermined length. The method is characterized by attaching one or more wires to the surface of existing electric wires.

The implementation of the present invention will be described below.

First, the molding of the SZ-shaped exterior body used in the present invention will be explained. Glass roving containers are made of Kevlar (trade name) as a core material, impregnated with semi-cured epoxy, made into strings, made of PVC, weather-resistant PE mixtures (including those containing cross-linking materials), Rubber such as EP rubber,
Cover with a plastic material, cut this string-like intermediate to a predetermined length, and shape it into a round bar (preferably made of metal) with an outer diameter slightly smaller than the outer diameter of the electric wire to be attached to a predetermined SZ shape. After winding the epoxy in a spiral shape at a suitable pitch, the epoxy is heated in a constant temperature bath, hot water, etc. to completely cure the epoxy.

This creates a preformed exterior body with high elasticity (spring properties), but the SZ shape refers to a shape in which the winding direction from one end of the exterior body reverses exactly in the middle and reaches the other end. .

The linear cross-sectional shape of this exterior body is circular, semicircular, crescent,
Or you can choose a polygonal one. The surface of the exterior body does not necessarily have to be smooth; rather, it is better to have unevenness.

FIG. 1 shows an FC embodiment in which an SZ-shaped exterior body with a circular cross-section of filaments is attached.

In the figure, l indicates an electric wire to which the exterior body 2 is attached.

Electron@1 is applicable to all products that have an insulating coating. In the figure, 0 indicates the midpoint of the nine sheaths 2 preformed in the SZ shape, and at this point the winding direction of the sheath 2 is reversed.

One end (not shown) of the sheathing body 2 is placed on the outer periphery of the electric wire 1, and then, while expanding the sheathing body 2, it is wound in the longitudinal direction of the electric wire so as to be tightly wrapped around the outer circumference of the electric wire l,
When it reaches 0, if you continue to wrap the wire in the opposite direction, as shown in the figure, the wire l with the sheath 2 in close contact with the
is formed.

Further, in the above case, the intermediate point O is positioned at a certain position in the longitudinal direction of the electric wire 1, and the outer casing 2 is spread over the outer periphery of the electric wire #Jl in the longitudinal direction of the electric wire in both directions and tightly attached. It can also be worn by wrapping it around it.

In FIG. 2, a tightening part 3 particularly for the electric wire 1 is provided at one end or both ends of the exterior body 2. Although only one end is shown in the figure, the tightening part 8 is used for 2 to 3 turns when the cord-like intermediate body is wound around a round bar with an outer diameter slightly smaller than the outer diameter of the electric wire at the stage of forming the exterior body 2. Wrap them vertically around the center axis of the round bar as much as possible by making them close together to form a tightening part, and then wrap them at the determined pitch as described above to reach the other end, if necessary. The tightening part 8 is formed by winding the round bar two to three times in a direction perpendicular to the central axis thereof, making them stick to each other.

The tightening part 8 can be formed integrally with the exterior body 2 as described above, but the plastic ring 4 split into two can also be used to constitute the tightening part, and the ring 4 can be formed as shown in FIG. 4 allows the ends of the exterior body 2 to be tightened. In this case, the plastic ring is, for example, a two-part ring with an open end made of heat-shrinkable plastic molded into a ring shape in advance. Once clamped, the open end of the ring is closed, for example by means of a fastener provided in that section, and heat shrinkage is applied so that the end of the sheath 2 is tightened to the wire 1.

As explained above, according to the present invention, an exterior body can be attached to an existing electric wire while it is being connected to an overhead wire,
There is no need to use a lashing machine, etc. The SZ-shaped exterior body is made of highly elastic material, and its inner diameter is slightly smaller than the outer diameter of the wire, so it does not stick to the wire. It will not fall off or come loose.

Furthermore, the exterior body used in the present invention is not simply wound in a spiral shape in one direction, but is formed in an SZ shape,
At exactly the midpoint of the sheath, the winding direction is reversed, and the sheath is applied to the wire 1m symmetrically around this midpoint, so the vector of force generated on the wire by the wind is centered around the midpoint. As the reverse becomes the next, balance. Therefore, gear ropping is less likely to occur.

Figure 4 shows an exterior body 2 with spirals running in opposite directions.
．． This is an example in which the electric wire is wound overlappingly in the length direction of the electric wire. In such a configuration, only one exterior body 2 is used and the effect is similar to or even greater than that of the companion.

The SZ-shaped preformed exterior body does not necessarily need to be applied continuously over the entire length, but may be installed at appropriate intervals. If a lightning strike occurs in the area where the exterior body has been applied, 1. At that time, the vibrations (small sled jumps) cause the snow on other parts to fall.

As explained above, according to the construction method of the present invention, it is possible to apply anti-snow measures to existing electric wires relatively easily, and not only can the exterior body itself be sufficiently attached to the electric wires, but also Depending on the shape of the exterior body itself, it is possible to sufficiently prevent snow from accreting, and the effects of implementing this function are extremely large.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment in which one SZ-shaped exterior body is attached to an electric wire. FIG. 2 shows an example of a tightening portion for electric wires at the end of the SZ-shaped exterior body. FIG. 3 shows an example in which a plastic ring is used as a tightening part for the electric wire at the end of the SZ-shaped exterior body. FIG. 4 shows an embodiment in which two SZ-shaped exterior bodies are attached to electric wires. DESCRIPTION OF SYMBOLS 1... Electric wire, 2... Exterior body, 3... Tightening part, 4...
・Plastic ring.

Claims (2)

[Claims] (1) In the longitudinal direction of the outer circumference of the existing electric wire, one or more sheathing bodies made of a dielectric material having an inner diameter slightly smaller than the outer diameter of the electric wire and having a predetermined length formed in an SZ shape are installed. A construction method for making existing electric wires less likely to accumulate snow. (2) Claim 1, characterized in that an alternating armor body is used in which a tightening portion is provided at one end or both ends of the exterior body made of a dielectric material of a predetermined length preformed in an SZ shape. The described construction method makes it difficult for snow to accumulate on existing electric wires. 2. A method for converting existing electric wires into snow removal and accretion according to claim 1, characterized in that a stone is used.