JP2000296478A - Earth rod driving pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct an earth of deep depth by preventing deformation and failure of an edge of a joint hole of an earth rod even at hitting against an obstruction including stone when the earth is embedded in the ground with adding vibration using an electric hammer drill. SOLUTION: A guide part 11 of a driving pin 1 is inserted into a joint hole 21 at a head part of an earth rod 2 and a tapered part 12 of the driving pin 1 is contacted to an inner surface of the joint hole 21. A struck part 13 of the driving pin 1 is applied vibratory striking force by a vibratory striking device and the striking force is transmitted from the inner surface side of the joint hole 21 to an earth rod 1 to drive the earth rod 2 without deformation of an edge 22 of the joint hole 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving pin used for driving an earth rod into the ground while applying impact or vibration.

[0002]

2. Description of the Related Art Electrical equipment and communication equipment need to be grounded for safety, and a grounding rod is buried underground for grounding. In the past, the ground rod was hit simply with a hammer or the like, but sometimes it was not possible to drive the ground rod deep enough until the required ground resistance was obtained. Therefore, a method of burying a ground rod using an electric hammer drill has been developed. In this method, the ground is drilled with an electric hammer drill, an earth rod is inserted into the hole, the drill teeth of the electric hammer drill are replaced with a jig, and vibration and impact are given to the earth rod to sink it into the ground. I was

[0003] As shown in FIG. 3, the casting jig is composed of a portion to be attached to a chuck of an electric hammer drill and a holder 32 for accommodating a head of an earth rod. It was inserted and cast. There are two types of grounding rods: a grounding rod used at the top of the ground and a grounding rod having a joint hole 21 used at the tip or middle. The grounding rod used at the top has a lead wire attached in advance. I have.

[0004]

The head of the earthing rod 2 having the joint hole 21 has a thin edge, the strength is not sufficient, and the edge is deformed by the powerful impact force of the electric hammer drill, and the joint is deformed. May not work.
In addition, when the ground is hard and the grounding rod for the uppermost part cannot be driven with a hammer drill, the final driving is performed with a manual hammer. There is a problem that deformation and damage are likely to occur.

An object of the present invention is to provide an auxiliary tool for preventing an excessive hitting force from acting on a thin edge of a joint hole, and an auxiliary tool for accurately hitting a top ground bar. Things.

[0006]

A guide portion which can be inserted into the joint hole so that a striking force does not directly act on an edge of the joint hole of the earth rod; a taper portion which expands in diameter from an upper end of the guide portion;
By using a driving pin formed of a hitting portion on the upper portion of the tapered portion, deformation and damage of the joint hole is prevented.
The striking force does not directly act on the thin edge of the joint hole of the earth rod, but the tapered portion of the driving pin contacts the inner surface of the joint hole and the striking force is transmitted to the earth rod. Instead, it is possible to bury the earth rod deep. Make the angle of the taper part smaller than the bevel angle of the joint hole.
By setting the degree, the casting pin is prevented from biting into the joint hole. Further, the top of the earth rod head for the uppermost part is protected by an insertion hole for receiving the head of the earth rod and a driving pin provided with a hitting portion at the upper part of the insertion hole, thereby facilitating the installation.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. Embodiment 1 A driving pin 1 shown in FIG. 1 includes a cylindrical guide portion 11 that can be inserted into a joint hole 21 of an earth rod, a tapered portion 12 that expands in a curved manner from the upper end of the guide portion, and a tapered portion 12. And a hitting portion 13 provided on the upper portion of the hitting portion.

As shown in FIG. 2, at the time of driving, the guide portion 11 of the driving pin 1 is inserted into the joint hole 21, and the curved tapered portion 12 is brought into contact with the chamfered portion and the inner surface of the joint hole 21.

The guide portion 11 may have any shape as long as it can be inserted into the joint hole 21 of the earth rod, and the length is equal to or shorter than the depth of the joint hole 21 so that the guide portion 11 can be easily inserted into the joint hole 21. The tip is tapered. The casting pin is integrally formed of steel, alloy, or the like, and the steel is quenched to have an appropriate hardness.

When drilling deep underground with an electric hammer drill, the extension drill teeth are connected. Extension drill teeth
Screws are provided at both ends of the drill teeth so that the drill teeth can be connected to each other.

When the ground to be drilled is soft, a drill extension rod is used, and a drill tooth is connected to the tip of the extension rod. The drill extension rod has a circular or polygonal cross section, and is provided at one end with a mounting portion for a hammer drill, and at the other end with a female screw for connecting a drill tooth. When the drill teeth are rotated and the ground is pierced, the earth and sand that is pushed up along the drill teeth is pressed against the hole wall when reaching the extension rod portion, and reinforces the wall.

Second Embodiment A driving pin 1 shown in FIG.
And a tapered portion 12 whose diameter increases from the upper end of the guide portion, and a hitting portion 13 provided above the tapered portion. As shown in FIG. 5, the driving pin 1 is inserted into the joint hole 21 and a ground rod is driven into the ground with an electric hammer drill.

The tapered portion 12 is linearly enlarged in diameter, and a radius is provided at a connecting portion between the guide portion 11 and the striking portion 13. In this embodiment, 5R is provided between the guide portion and the tapered portion. A 3R radius is provided between the section and the striking section. The angle of the tapered portion 12 is set to a smaller angle than the chamfered angle provided in the joint hole 21 so that there is a gap between the tapered portion 12 and the ground rod head. If this taper angle is more acute than the chamfer angle of the joint portion 21, the taper portion 12 will bite into the joint hole 21 due to the impact force and it will be difficult to remove it after casting, or the casting pin will break from the taper portion 12. There are cases. In the embodiment shown in FIG. 5, the chamfer angle of the joint hole 21 is 45 degrees, and the taper angle of the casting pin 1 is 15 degrees.

Embodiment 3 The driving pin 1 shown in FIG. 6 comprises an insertion hole 15 for receiving the top of the top grounding rod, and a hitting portion 13 provided on the upper part thereof. When the ground is hard and the ground rod cannot be driven with an electric hammer drill, the driving pin is installed on the top of the ground rod for the uppermost part to widen the hitting part and protect the ground rod head while hitting. It is easy to do.

Fourth Embodiment A driving pin shown in FIG. 7 is a driving pin for driving an uppermost ground rod similarly to the third embodiment, and has a tapered insertion hole. The tapered shape prevents the grounding rod from biting into the insertion hole of the driving pin and cannot be removed.

[0016]

By using the driving pin having the guide portion of the present invention, the striking force is transmitted to the inner surface of the joint hole of the earth rod, and even if an excessive striking force is applied, the edge portion is deformed. The earth rod can be sunk without any trouble.
In addition, the uppermost driving pin ensures that the hammer is hit by human power accurately and does not damage the ground rod. In addition, by making the insertion hole tapered, the casting pin does not bite into the ground rod,
Can be easily removed.

[Brief description of the drawings]

FIG. 1 is a front view of a casting pin according to a first embodiment.

FIG. 2 is a cross-sectional view illustrating a state where the driving pin according to the first embodiment is mounted on a ground rod.

FIG. 3 is an explanatory view of a state where a ground rod is placed.

FIG. 4 is a front view of a casting pin according to a second embodiment.

FIG. 5 is a cross-sectional view showing a state where the driving pin according to the second embodiment is mounted on a ground rod.

FIG. 6 shows a casting pin according to a third embodiment.

FIG. 7 is a driving pin according to a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casting pin 11 Guide part 12 Taper part 13 Hitting part 2 Ground rod 21 Joint hole 22 Edge

Claims (7)

[Claims] 1. A ground rod driving pin comprising a guide portion insertable into a joint hole of a ground rod, a tapered portion expanding in diameter from an upper end of the guide portion, and a hitting portion provided above the tapered portion. 2. The ground rod driving pin according to claim 1, wherein the tapered portion has a curved diameter that increases in a curved manner. 3. The ground rod setting pin according to claim 1, wherein the taper angle is smaller than the chamfer angle of the joint hole of the ground rod. 4. The method according to claim 3, wherein the taper angle is 15
A ground pin casting pin that is a degree. 5. The ground rod driving pin according to claim 1, wherein the upper surface of the hitting portion is a curved surface. 6. A ground rod driving pin comprising an insertion hole for receiving a head of the ground rod, and a hitting portion provided above the insertion hole. 7. The ground rod driving pin according to claim 6, wherein the insertion hole is tapered.