JPH025372A - Construction of earth wire - Google Patents

Abstract

PURPOSE:To obtain grounding with high reliability at a low cost by binding earth wires made of copper stranded wires or the like with a binding metal of a special structure, inserting them into a boring hole with a hollow rod, separating them, then extracting the hollow rod while filling a resistance reducing agent. CONSTITUTION:Earth wires 8 made of copper stranded wires or soft copper wires which can be used at a free length are inserted into multiple vertical holes 4 with slip stop grooves 7 of the harpoon main body of a binding metal 1 and fixed by fastening screws 6 respectively. The regulating rod 3 of the metal 1 is inserted into a hollow rod 9, the hollow rod 9 is sent to the deepest section of a boring hole 12 formed by a boring machine, an electric resistance reducing agent 13 such as soda silicate is filled through the hollow hole, thereby the metal 1 is released and the boring hole 12 is filled with the resistance reducing agent 13. A commercial article can be used as it is for the earth wires, the cost is low, it has no connection point, thus grounding with high reliability against the ground sway such as an earthquake is obtained.

Description

Detailed Description of the Invention (Purpose of the Invention) A. Field of Industrial Application The present invention is directed to a device buried underground to protect various electrical equipment and facilities from abnormally high currents caused by lightning damage, etc. Concerning grounding and gland construction methods. More specifically, the present invention provides a ground wire that uses a ground wire bundling fitting that binds a plurality of ground wires together and has a structure suitable for underground filling with a reduced β11 that reduces the resistance value of the ground wire. This relates to the construction method.

Conventional technology When a particularly low grounding resistance value is required for the earth electrode, a long borehole is drilled with a boring machine that reaches a high-conductivity stratum deep underground, and a high-conductor A large number of earth conductors 1 to 4 made of round rods of magnetic metal are added together.
A method is adopted in which the borehole is inserted from T and then the entire borehole is filled with a reducing agent solution to fill the gaps in the borehole and to enhance the grounding effectiveness of the earth electrode.

Problems to be Solved by the Invention In the prior art described above, screws for addition are provided at both ends of the ground electrode except for one opening at the tip. By connecting the screws, a large number of earth conductors can be inserted and installed into a long bore hole.

This method of connecting the earth electric cable has the risk of damaging the connection status of the screw connection point due to ground shaking if there is a fog in the nearby area, and it is important to avoid electrical connection and stability. Therefore, it is necessary to use screw parts with high precision, and the processing cost is also extremely high.

[Structure of the invention]

20 Means for Solving the Problems The present inventor has made extensive studies to solve the problems of the prior art described above. As a result, we have made the ground electrode into a linear object that can be used at any length, making it possible to bundle multiple such ground wires together efficiently, and to stabilize the resistance value of the ground wire while burying the ground wire. The present inventors have discovered that a jig with a structure suitable for filling underground a reducing agent solution (hereinafter referred to as a reducing agent) that can reduce the amount of carbon dioxide is extremely effective and essential, and has completed the present invention.

To summarize the present invention, the present invention comprises: (1) providing a boring hole with a desired depth using a boring machine; (2) providing a desired number of ground wires; (1) a cylindrical rust body; (II) the rust body a regulating rod for fitting into the tip opening of a hollow rod protruding from the center of the rear end surface; (iii) an end of a ground wire drilled in the rear end surface of the harpoon body around the regulating rod; (iv) A plurality of vertical holes for inserting the rust into the respective vertical holes as appropriate; (3) The end of the ground wire is clamped into the vertical hole of the ground wire bundling fitting, which consists of a screw hole for fixing the end of the ground wire with a screw; (4) At the same time, the hollow rod allows the binding fitting to which the ground wire is tied to reach the deepest part of the borehole, and (4) the tip of the borehole. In this step, the insertion state between the hollow rod and the regulating rod of the one-bundle metal fitting is released, and a reducing agent for reducing the earth pole resistance value in the borehole is introduced into the borehole from the tip opening of the hollow rod. (5) Even while the hollow rod is being removed from the borehole, the reducing agent is poured into the borehole from the tip opening of the hollow rod (this is the process of filling the hollow rod) (6) Removal of the hollow rod from the borehole The present invention relates to a ground wire installation method characterized by: burying a desired number of ground wires in a borehole by assimilating a low liquid agent.

Hereinafter, the configuration of the present invention will be explained in detail.

First, the ground and gland employed in the ground wire construction method of the present invention will be explained.

It can withstand ground shaking and can be manufactured at low cost.
A wire-shaped earth electrode made of a conductive metal such as commercially available stranded copper wire or mild steel wire is preferable.

These ground wires are long because they are highly flexible, and if a winding drum is used, they can be stored in a small space, and since there are no connection points, they are resistant to ground shaking. However, there is no need to worry about the electrical connection status.

The construction method of the 7-ground wire of the present invention is characterized in that the above-mentioned binding fittings are used to construct the ground wire having such characteristics. Attach the end of the ground wire to the strap!
4 (Attach and fix the end fittings between the tips of the hollow rods.)
Add one piece of silk to the part, add one piece of silk to the hollow rod, and then draw the ground wire into the long borehole. This type of borehole has a relatively small diameter and there is only a narrow space around the inserted hollow rod, so it is better to use a small diameter ground wire than to use one large diameter ground wire. It is preferable to use a u'C multi-failure capacitor according to the required electric capacity due to economic efficiency and construction work.

Next, when the bundling fitting with the desired number of ground wires tied together reaches the deepest part of the borehole by being guided by the hollow 1" rod and the inner wall surface of the borehole, the end opening of the hollow rod and the bundling fitting fit together. Release the inserted state. Then, at the same time as the inserted state of both is released, the reducing agent filled in the hollow part of the hollow rod is allowed to flow out into the borehole (J). For example, inorganic materials based on sodium silicate, calcium oxide, alumina oxide, or stone can be used. In consideration of the above two points, the present invention provides a structure of the binding fitting that allows multiple earth wires to be reliably and easily bundled in one piece. In addition, it has a horizontal width that allows it to be freely attached to the opening at the tip of the hollow rod.

E9 Effects and Examples The present invention will be explained in more detail with reference to the drawings.

Figures 1 to 3 relate to the binding fitting (1) used in the ground wire installation method of the present invention, and the center part of the rear end surface of the M-shaped harpoon body (2) is A regulating rod (3) of a required length that can be loosely inserted into the front end portion (10) of the rod (9) is protrudingly provided.

Furthermore, the rear end surface of the cylindrical harpoon body (2) is provided with a plurality of vertical holes (4) into which the rear ground wire (8) is inserted around the aforementioned regulating rod (3). , on its inner circumferential surface there is an anti-slip groove (7) force S to prevent the ground wire (8) from coming off.
41. On the side of the cylindrical harpoon body (2), there are screw holes (5) that intersect with the vertical holes (4) in different steps from the center line direction of the harpoon body (2). be penetrated.

The fixing of the end fitting (1) and the plurality of ground wires (8) is shown in FIG. That is, as shown in FIG.
Connect the end of the ground wire (8) inserted into the screw hole (5) into the screw hole (5).
) through the screws (6), and when fixed, it is integrally fixed to the plurality of ground wires (8) or the binding fittings (1).

The plurality of ground wires (8) integrally fixed to the binding fitting (1) as described above are buried in the borehole according to the following nine sections, and function as a ground conductor.

As shown in Fig. 4, a binding fitting (1) that binds the ends of a plurality of earth glands (8) has a regulating rod (3) protruding from its rear end face. ) is inserted loosely into the tip opening (10) of the hollow rod (9) together with the hollow rod (9) into the caulked borehole (12). The ground wire (8), whose main body is housed in the winding drum (11), is drawn in by a hollow rod (9) serving as a supplement, and is inserted into the bore hole (12) as shown in FIG. Ru.

Thereafter, the state of engagement between the tip opening (1) of the hollow rod (9) and the regulating rod (3) of the binding fitting (1) is left unattended, and the ground wire (8) bound and fixed to the binding fitting (1) is left open. The hollow rod (9) is lifted up leaving behind. At that time, the reducing agent or ground wire (
In order to further improve the grounding effect of step 8), it is injected and filled into the gap between the inserted earth wire (8) and hole link hole (12).

In the present invention, the above-described injection of the reducing agent can be performed efficiently due to the structure of the binding fitting (1) and its relationship with the hollow rod (9). This will be explained with reference to FIG. In the present invention, since the filling operation of the solution of the reducing agent (13) is carried out in parallel with the lifting operation of the hollow rod (9), the reducing agent (13) is 13) mixing into the solution can be minimized,
The effect of using the reducing agent (13) can be made sufficient.

That is, when the hollow rod (9) is lifted up, the hollow rod (9) is already filled with the solution of the reducing agent (13), and the tip opening (10) of the hollow rod (9) is filled with the solution of the reducing agent (13). or 6th
As shown in the figure, the solution of the reducing agent (13) overflows from the tip opening (10) at the same time as it comes off the binding metal fitting (1), and the solution of the reducing agent (13) overflows into the deepest part of the borehole (12) where no earth and sand are mixed. It is also possible to inject and fill the solution with a frame reducing agent (13).

Continue to apply the reducing agent (13) to the hollow rod (9) from the rear.
Since the solution is being replenished, the speed should be increased by increasing the speed at the tip opening (
If the amount of outflow from 10) is adjusted, the momentum of the outflow is suppressed, and it is possible to suppress landslides within the borehole (12). In addition, by injecting the solution of the reducing agent (13) in this way, the solution of the reducing agent (13) completely replaces the circulating water for boring during boring drilling that stays in the small ring hole (12). can do. Immediately, the solution of the reducing agent (13), which has a heavy specific gravity, pushes up the stagnant water and covers it outside the hole, so that the stagnant water can be completely replaced. In the present invention, when a reducing agent solution with a small specific gravity is used, the reducing agent solution may be pumped in through a hollow rod in order to more smoothly replace the circulating water. The solution of reducing agent (13) then hardens;
The ground wire (8) is in its final buried state as shown in FIG.

〔Effect of the invention〕

According to the present invention, j'-base wires such as stranded copper wire and annealed copper wire, which can be used in any length as ground electrodes, are bundled using special @-made binding fittings, and they can be efficiently connected underground without any connection points. Can be buried well. Furthermore, according to the present invention, since the structure of the ground wire binding fitting is suitable for filling underground with a reducing agent that reduces the resistance value of the ground wire,
In parallel with burying the ground wire underground, filling of the reducing agent underground
1): $I can do things well.

Therefore, the ground wire construction method of the present invention does not require special processing as a ground wire, and commercially available products can be used as they are, so the grounding cost is extremely low. Since it can be used freely without any points, even if the nearby ground shakes due to an earthquake or the like, the electrical connection remains stable and highly reliable grounding can be achieved.

Furthermore, by using a reducing agent, a long-term stable grounding effect can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a partially see-through perspective view of a ground wire binding fitting used in the ground wire construction method of the present invention, Fig. 2 is a partially see-through side view of the binding fitting, and Fig. 3 is a partially see-through side view of the binding fitting. FIG. 2 is a partially transparent plan view. Figure 4 is a state diagram with the binding metal fittings and the ground wire fixed, Figure 5 is a state diagram when the ground wire is inserted into the borehole, Figure 6 is a diagram explaining the injection work of the reducing agent, and Figure 7 The figure shows a cross-sectional view of the completed structure with the ground wire buried. ......Binding fittings...Cylindrical harpoon body...Regulation rod...Vertical hole... ...Screw hole...Tighten with screw 7)...Non-slip groove 8)...Ground wire 9) ......Hollow rod 10)...Tip opening 11)...Take-up drum 12)...
...Borehole 13) ...Reducing agent

Claims (1)

[Scope of Claims] [1] A method for constructing a ground wire, which includes: (1) providing a boring hole with a desired depth using a boring machine; (2) installing a desired number of ground wires; (i) a cylindrical harpoon body; ii) a regulating rod for fitting into the tip opening of a hollow rod protruding from the center of the rear end surface of the harpoon body; (iii) a regulating rod bored in the rear end surface of the harpoon body around the regulating rod; a plurality of vertical holes into which the end of the ground wire is inserted to an appropriate length; (iv) vertical holes penetrated through the sides of each of the vertical holes from the direction of the center line of the harpoon body so that they intersect at different levels; a screw hole for tightening and fixing the end of the ground wire inserted into the ground wire with a tightening screw; (4) At the deepest part of the borehole, by inserting the ground wire into the regulating rod of the bundling fitting, and allowing the bundling fitting to which the ground wire is tied to reach the deepest part of the borehole by means of a hollow rod; releasing the inserted state of the regulating rod of the hollow rod and the binding fitting, and at the same time causing a reducing agent for reducing the earth pole resistance value in the borehole to flow out and fill the borehole from the front end of the hollow rod, (5) Even while the hollow rod is being removed from the borehole, the reducing agent flows out and fills the borehole from the tip opening of the hollow rod, and (6) After the hollow rod is removed from the borehole, the reducing agent is solidified. A ground wire construction method characterized by burying a desired number of ground wires in a borehole. [2] The method of constructing a ground wire according to claim 1, wherein the ground wire binding metal fitting is provided with an anti-slip groove on the inner surface of the vertical hole to prevent the ground wire from coming off.