JPS6362172A - Push-in earth pole - Google Patents

Abstract

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

Description

Detailed Description of the Invention (Purpose of the Invention) A. Field of Industrial Application The present invention relates to a safety ground for electrical equipment, and the present invention relates to a ground electrode that is pushed into the ground under the utility pole by its own weight when buried in the utility pole. This invention relates to.

Prior art The prior art related to the present invention is a method and structure for burying a spirally pressed earth electrode according to Japanese Patent Publication No. 52-18385, and a method and structure for burying a spirally pressed earth electrode according to Japanese Patent Publication No. 52-40424. These are two cases in which a spiral can be created by winding a good conductive metal rod into a spiral shape as shown in the open plan view in Figure 6 of the attached drawing and the side view in Figure 7. With a shaped ground pole (1), the press plate (2) formed radially in four directions can be cut out to match the pitch of the spiral ground pole (1)! (3) to integrate the spiral earth electrode (1) and the pressing plate (2), but the height of the regulating groove (3) increases as it moves toward the end. This is set as a step on the bottom of the hole (5) that was excavated to bury the utility pole, and when the utility pole (6) is placed in this step, the suppressing plate (
2) and the spiral earth pole 1) are pushed into the ground under the bottom of the hole (5), but at this time, the spiral earth pole (1) has a step on the pressing plate (2). As a result, the notched regulation groove (3) causes the spiral earth electrode (1) to extend and deform in a spiral shape, and the spirally deformed spiral earth electrode (1) is grounded with its entire surface to exert a grounding effect. This is a similar technology.

Note that (4) is a lead wire attached to the spiral earth electrode (1).

C.3 Problems to be Solved by the Invention It is well known that the effect of installing a ground electrode is, in principle, more effective as the installation depth is increased and the contact surface with the soil is increased.

Considering the prior art based on this principle, the ability of the spiral earth pole to develop and deform in a spiral with the maximum dead weight of a cocrete pole of about 2 tons is not as strong as that shown in the left, and is only about 20 cl++ at most. The limit is set by the ability to develop and deform.

Therefore, since the spiral earth electrode (1) only extends into the ground to a depth of only about 20 cm from the base of the utility pole, it is insufficient as a grounding effect, and an even greater effect is required.

Moreover, since the utility pole (6) is placed directly on the clamping plate (2), the utility pole that gets wet during rain may conduct current on the ground surface, which is dangerous.

Means for Solving Problem 21 Herein, the present invention provides a means for most effectively utilizing the dead weight of a utility pole by placing a ground pole composed of a plurality of poles in an upright position along the longitudinal direction of the utility pole. At the same time, it shall be installed as deep as possible with the pushing force of the pole made efficient by such means, and an insulator shall be connected between the earth electrode and the pole. This is how it was done.

Effects and Examples Examples and effects of the present invention will be explained below with reference to the accompanying drawings.

With the first open plan view and the side view according to FIG.
) is a ground pole, which is made by bending the center of an edible metal rod with a planned length at right angles, making the bent part slightly straight in a planar shape, and lowering equal positions on both sides. Two pieces were prepared, with each side having a downwardly bent and elongated shape at a right angle, with the tip of each elongated part shaped into a pointed shape. This is fixedly connected and manufactured into a four-directional radial plane shape with equal spacing, which has an outer diameter that is approximately the same as the diameter of the telephone pole, and is integrally connected to a connecting plate (2) made of an erodible metal plate. However, the procedure is to first drill a hole in the part of the coupling plate (2) that corresponds to the ground electrode (1), insert each ground electrode (1) into the hole, and then connect the - of each ground electrode (1). Attach the side stop with the U bolt (4) and nut (5).
), the earth electrode (1) and the coupling plate (2) are integrally coupled.

(6) is an insulating plate made of synthetic resin or the like and having the same outer diameter as the connecting plate (2), and has a part corresponding to the upper nand (5) with an operating rod hole (7) screwed into its center. A portion of it is cut and bonded to the bonding plate (2) using an adhesive or the like.

Also, (3) is a lead wire, which is the ground pole (1
) is crimped and bonded to an appropriate part of the earth body (A).

Next, the construction procedure of the present invention will be explained.

As shown in Fig. 3, the present invention first excavates a hole (8) for a utility pole using an earth auger, and then inserts an operating rod (9) into an operating rod hole (7) screwed into the center of an insulating plate (6). After lowering and fixing the grounding body (A) onto the bottom of the hole (8) using the operation rod (9), remove the operation rod (9) and attach it to the telephone pole (as shown in Fig. 4). 10), and as a result of this operation, the earthing body (A) carrying the full weight of the utility pole (10) automatically pushes the four earthing poles (1) into the ground. However, in the soil in question, when excavating with an earth auger, it is predicted that if the earth pole (1) is hard to push in due to its own weight, it will be impossible to push in the earth pole (1). When connecting, connect the utility pole hole (8) to the ground pole (1) as shown in Figure 5.
After excavating the extra length of the earth electrode (A) and placing the earth body (A) therein, a cement-based earth resistance reducing agent is injected into the earth electrode (1) and the embedding hole and hardened to form a reduced concrete body. After (1)), the purpose can be fully achieved by inserting and fixing the utility pole.

Effects of the Invention According to the present invention, if the length of the earth electrode that is inserted into the four equal parts of the outer circumference of the utility pole is 50 cm, the total length is 2.
Therefore, according to simple calculations, it is the same as if the earth pole (1) was buried 2 m from the base of the utility pole.However, since the diameter of the base of the utility pole is about 45 cm, its outer circumference Since the earth poles installed at the poles will interfere with each other and their effectiveness will be roughly halved, the result will be the same as when the earth poles are installed 1 m from the base of the pole. However, if we add the specified underground depth of 2.5 m for utility poles, the earth pole will be installed 3.5 m deep underground, and the effect is significant.

However, it is almost impossible to push a single earth pole into the base of a utility pole by 1 meter due to its own weight, and this can only be achieved by combining four poles as in the present invention. Therefore, the present invention, which can be automatically constructed at the same time as embedding the utility pole without any special grounding work and has a sufficiently low resistance value, is sure to make a great contribution to this field.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the earth body (A), and FIG. 2 is a side view of the same. FIGS. 3 to 5 are explanatory views of the construction procedure and effects of the present invention. FIG. 6 is a plan view of the prior art, FIG. 7 is a side view of the same, and FIG. 8 is an explanatory diagram regarding the operation and effect. 1. Earth pole 7. Operation rod hole 2, connecting plate 8. Embedded hole 3, lead wire 9° operating rod 4, U bolt 10. M1 Pillar 5, Natsuto
1). Reduced concrete body 6, insulation board
A, Earth body or higher

Claims (1)

[Claims] A metal rod of a planned length is bent at a right angle, and the bent portion is set as a straight line in a plan view, and each of the rods is bent downward and extended by an equal amount at right angles at equal positions, and each tip is made into a pointed shape. Prepare two pieces of this, match the straight corner parts of each piece, and fix them together to form a radial plane shape divided into four equal parts, and then bend them downward by the same amount from the same position to make the desired shape. Attach the lead wire (3) to the ground pole (
1), and the ground electrode (1) is made of a good conductive metal plate with approximately the same outer diameter as the base of the utility pole, and is inserted into a connecting plate (2) that is perforated in the part corresponding to the ground electrode (1). and each earth pole (
1) and the connecting plate (2) are U bolts (4) and nuts (5).
), and furthermore, an insulating plate (6) made of synthetic resin material, etc., with an operating rod hole (7) screwed into the center, is closely attached to the connecting plate (2). Push-in earth pole.