JP2000030775A - Grounding component for electric light pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a grounding member on an electric light pole prior to its erection, save time for separately burying the grounding member, and simplify work for pole erection, by providing an expandable bellows-type tubular body fittable to a lower end part of the electric light pole and mounting the grounding member made of a conductor on, at least, the outside of a lower surface part of the body. SOLUTION: This grounding component 1 for an electric light pole has a tubular body 2 made of a plastic material. This body has a hard bottom part 3 with a large thickness and a soft tube part 4 formed in a bellows shape, and integrally forms an upward opened glass shape, and the tube body 4 is expandable/contractible in the axial direction. A bolt 6 is provided on the bottom part 3 of the tube body 2 for mounting a grounding member. As the grounding member 7, a conductive metallic plate, a metallic rod, a metallic net, or the like is used. The grounding component 1 for an electric light pole is mounted on an end part of the hollow electric light pole in a force fit manner. Because of the bellows type employed, the length to cover the electric light pole can be freely adjusted. The grounding component 1 may be mounted on the electric light pole beforehand or may be mounted on the electric light pole at a pole erection work site.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding component which is used by being attached to a lower part of a utility pole requiring grounding work.

[0002]

2. Description of the Related Art Grounding work is required by law to prevent accidents due to earth leakage on power poles equipped with transformers, lightning arresters, high-voltage equipment, and the like. This grounding work is performed by embedding a grounding member (grounding pole) at a predetermined depth around a pole to be built and connecting a ground wire of the pole to the grounding member.

[0003] In the method widely used in the past as the grounding work, as shown in FIG. 9, a hole H having a predetermined depth is dug in a place where a telephone pole 20 is to be built, and a grounding member (generally, a copper plate) P is formed. In this method, the grounding member is buried by using the hole for the pillar by filling the bottom with the hole H for the pillar and filling a filler J such as soil from above. The electric pole 20 is built by inserting the grounding member P from above the embedded filler, filling the periphery with the filler J, and squeezing it. The grounding member P buried under the power pole is connected to a ground terminal E provided at an intermediate portion of the power pole through a ground wire 9. In this case, the distance L between the two poles (that is, the thickness of the filler layer on the grounding member) is set to a predetermined length (for example, 30) so that the lower part of the utility pole does not contact the grounding member P buried under the pole.
cm) or more.

[0004]

In the above-mentioned conventional pole method, it is necessary to bury the grounding member and fill the filler before inserting the electric pole into the pole hole, so that the process is complicated. There was a problem that becomes. Further, since a grounding member must be separately prepared and brought to the site separately from the telephone pole, the number of parts to be managed increases, and there is a problem that the operation becomes complicated. Therefore, an object of the present invention is to make it possible to attach a grounding member to a utility pole in front of a pole, to save the time and effort for separately burying the grounding member, and to simplify the pole work.

[0005]

In order to solve the above problems, the present invention employs the following configuration. That is, the power pole grounding component according to the present invention includes a telescopic bellows-type cylindrical main body that can be fitted to the lower end of the power pole, and a grounding member made of a conductor is attached to at least the outside of the bottom surface of the main body. It is characterized by: As this grounding member, a copper plate that has been widely used in the past may be used, but if a scalable grounding member is used, it can be compactly stored in a contracted state when carrying a utility pole, etc. It is preferable to increase the area because the ground resistance can be reduced.

The bellows-type cylindrical main body is preferably made of a soft insulating material such as flexible plastic. If a wire mesh having elasticity and conductivity is provided on the outer surface of the cylindrical body made of an insulating material, the wire mesh also expands and contracts together with the body, and also functions as a grounding member.
More effective.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific description will be given based on the embodiment shown in FIG.

The electric pole grounding component 1 has a cylindrical main body 2 made of a plastic material which is an insulating material. The cylindrical main body 2 is integrally formed in a cup shape opening upward with a hard and thick bottom portion 3 and a flexible cylindrical portion 4 formed in a bellows-like manner. It is stretchable.

A bolt 6 for attaching a grounding member is provided on the bottom 3 of the cylindrical main body 2, and a grounding member 7 is attached by the bolt. The grounding member 7 may be a simple conductive metal plate (for example, a copper plate) as shown in FIG.
A metal rod or a wire net (all of which are made of conductive material such as copper) may be used, and a scalable grounding member 7 'as shown in FIG. 3 may be used.

The grounding member 7 'is made of an expandable metal plate having a plurality of cuts 7a penetrating on the front and back, and is compact when the cuts 7a are narrowed during storage or transportation. When it is buried in the ground at the site, it can be buried in a state close to the cross-sectional area of the hole H to be buried, as shown in FIG. When the grounding member is expanded and buried in this manner, grounding can be performed over a wider range by that amount, which is effective in reducing grounding resistance. When the cross-sectional area of the hole H is small,
The expanded grounding member 7 'may be embedded by bending it upward or downward along the utility pole.

An earth wire 9 is connected to the bolt 6. A connection tool 9a having a round hole as shown in FIG. 10 is attached to the end of the ground wire 9, and the bolt 6 is inserted into the round hole and the nut 9b is tightened, so that the ground wire 9 is securely attached. Connected to bolt 6. Instead of such a connection method, connection may be made by brazing, welding, or the like.

The power pole grounding component 1 is used by fitting it to the lower end of a power pole 20 as shown in FIG. The electric pole 20 in the illustrated example is made of reinforced concrete and has a hollow core. A ground terminal E for grounding is provided at a position slightly below the upper and lower middle portions of the utility pole 20 (see FIG. 8). The ground terminal is a conventionally known one. The ground terminal E is connected to a ground wire 8 from a device such as a transformer T mounted on a power pole. Further, the ground wire 9 connected to the ground member is connected to the ground terminal E through the inside or outside of the telephone pole.
Connected to In the figure, the ground terminal 2 and the ground member 7 are connected by the ground wire 9 passing through the hollow portion 20a of the utility pole 20, but if this is done, the ground wire 9 does not come into contact with an external object or the like. Its protection is assured.

The main body of the bellows type elastic grounding component 1 is forcibly fitted to the lower end of the telephone pole 20, and the grounding member 7 is provided outside the main body. Even if poles are not prepared, grounding work can be performed at the same time by constructing the pole as it is. Since this grounding component 1 can be extended and contracted in a bellows manner, the length of attachment to the utility pole can be freely adjusted. The grounding component 1 may be attached to a utility pole in advance, or may be attached to a utility pole at a construction site of a pole.

Further, since the grounding component 1 is in the shape of a cup having a bottom, it is possible to carry an object therein. For example, a ground improving agent (conductivity improving agent) such as lime powder is put in the grounding component 1 and filled into the hole H at the site, so that the electric conductivity of the ground where the hole is dug is formed. Can be improved. Further, together with such a soil conditioner, a bag made of, for example, polyethylene and the like, which is sealed with water, can be put. When the water bag is put on the soil conditioner in the hole H and a utility pole is inserted from above, the bag is broken by the weight of the utility pole, and water flows out into the hole. For this reason, the ground resistance can be further reduced.

Next, FIG. 7 shows an embodiment different from the above. This grounding component 10 is a flexible metal wire mesh (for example, copper) having conductivity on the outer surface of a bellows-type tubular main body 12. A wire woven net 15 is applied. This wire mesh functions as a grounding member, and in some cases, it can be expected that a specified grounding resistance can be obtained only with this wire mesh. However, if a grounding member similar to the above is provided at the bottom of the main body, it is more effective. It is. In this case, the main body 1
2 itself also serves as a grounding member, so the distance L from the upper end to the ground (GL) is set to a specified value (for example, 750 m).
m), but since this grounding component is stretchable, it can be easily adjusted to that distance. If the ground resistance is not less than the specified value with only the grounding component of the present invention, another auxiliary electrode may be buried at an appropriate interval on the side of the pole built, and connected in parallel with the ground electrode. .

[0016]

As described above, the power pole grounding component according to the present invention has a grounding member provided on the outer surface of a tubular main body that can be extended and contracted in a bellows manner, and is fitted to the lower end of the power pole. By inserting the grounding member into the hole for the pole, the grounding work can be performed as it is, so that the conventional construction in which the grounding member is buried first and then the pole is built can be greatly simplified. Since this grounding component can expand and contract in a bellows-type, it can be made compact in a contracted state during transportation or storage. In addition, since the length of the utility pole can be adjusted according to the construction conditions of the pole, such as the depth of the hole, it is possible to adapt to a wide range of construction pole conditions.

[Brief description of the drawings]

FIG. 1 is an external view showing a specific example of the present invention.

FIG. 2 is an explanatory view of the contracted state.

FIG. 3 is an explanatory view of an expansion / contraction type grounding member.

FIG. 4 is a plan view of the expansion / contraction type ground member in an expanded state.

FIG. 5 is an explanatory diagram of a method of use.

FIG. 6 is a side view showing a use state.

FIG. 7 is an explanatory diagram of an embodiment different from the above.

FIG. 8 is an overall view showing a method of use.

FIG. 9 is an explanatory diagram of a conventional grounding method.

FIG. 10 is an explanatory view of a ground wire connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grounding part for telephone poles 2 Main body 3 Bottom part 4 Cylindrical part 7 Grounding member 9 Earth wire 10 Grounding parts for telephone poles 15 Wire mesh 20 Telegraph pole

Claims (3)

[Claims] 1. A ground for a power pole, comprising: a bellows-type tubular body which can be extended and retracted, which can be fitted to a lower end of the power pole, and a grounding member made of a conductor is attached to at least an outer side of a bottom face of the main body. parts. 2. The grounding component for a power pole according to claim 1, wherein the grounding member is an expansion / contraction type grounding member whose area can be expanded as necessary. 3. The bellows type cylindrical main body is formed of an insulating material,
The grounding component for a utility pole according to claim 1, wherein a stretchable metal net is provided on an outer surface thereof.