JPH057833B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object 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 abnormal high-voltage currents caused by lightning damage, etc. Regarding the construction method of the ground wire. More specifically, the present invention relates to a ground wire bundling fitting that binds a plurality of ground wires together and has a structure suitable for filling underground with a reducing agent that reduces the resistance value of the ground wire. This relates to construction methods.

B. Conventional technology When a particularly low grounding resistance value is required for the earth electrode, a long borehole is drilled using a boring machine to reach a conductive stratum deep underground.
A large number of ground electrodes made of round rods of good conductive metal are inserted into the borehole, and then a reducing agent solution is applied throughout the borehole to fill the gaps in the borehole and enhance the grounding effect of the earth electrode. A filling method is used.

C. Problems to be Solved by the Invention According to the prior art described above, screws for addition are provided at both ends of the earth electrode except for the first one at the tip, and by connecting the screws, a large number of earth electrodes are connected. It is inserted and installed into a long borehole while adding electrodes.

If an earthquake were to occur in the nearby area, there is a risk that the connection status of the screw connection location would be damaged due to ground shaking. It is necessary to use screw parts, and the processing cost is also very high.

[Structure of the invention]

D. 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. We 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 have completed the present invention.

To summarize the present invention, the present invention provides: (1) providing a borehole of a desired depth using a boring machine; (2) providing a desired number of ground wires; (i) a cylindrical harpoon body; (ii) the harpoon body; (iii) a regulating rod for fitting into the opening at the tip of a hollow rod protruding from the center of the rear end surface; (iii) a terminal end of a ground wire drilled in the rear end surface of the harpoon body around the regulating rod; (iv) A ground wire inserted into each vertical hole that is penetrated from the side of each vertical hole so as to intersect with each other at different levels from the direction of the center line of the harpoon body. a screw hole for tightening and fixing the terminal end of the ground wire with a tightening screw; (4) At the tip of the borehole, the hollow rod and the binding fitting are inserted into the regulating rod of the binding fitting, and the binding fitting to which the ground wire is tied by the hollow rod reaches the deepest part of the borehole. (5) Boring of the hollow rod: releasing the insertion state of the regulating rod, and causing a reducing agent for reducing the ground resistance value in the bore hole to flow out and fill the bore hole from the tip opening of the hollow rod; (6) After the hollow rod is removed from the borehole, the desired number of ground wires is bored by solidification of the reducing agent. The present invention relates to a method for constructing a ground wire, which is characterized by burying it in a hole.

Hereinafter, the configuration of the present invention will be explained in detail.
First, the ground wire employed in the ground wire construction method of the present invention will be explained.

As a ground electrode that can withstand ground shaking and be manufactured at low cost and can be used in any length, for example, a wire made of a conductive metal such as commercially available stranded copper wire or annealed copper wire can be used. A ground electrode is preferred.

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

The method for constructing a ground wire according to the present invention has a major feature in that the above-described binding fittings are used to construct a ground wire having such characteristics.

That is, during construction, the end of the ground wire is attached and fixed to the binding metal fitting, the binding metal fitting is loosely fitted into the opening at the tip of the hollow rod, and the earth wire is inserted into the long boring hole while connecting the hollow rod. Do this in a way that draws you in. 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 to provide the required capacitance than using a single large diameter ground wire. It is preferable to use a plurality of them in terms of economy and construction work.

Next, when the bundling fitting with the desired number of ground wires tied together is guided by the hollow rod and the inner wall surface of the borehole and reaches the deepest part of the borehole, the state of engagement between the tip opening of the hollow rod and the bundling fitting is confirmed. to open. 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 caused to flow out into the borehole. This type of reducing agent is
Well-known and commonly used ones are used, and there are no special restrictions. For example, an inorganic material based on sodium silicate, calcium oxide, alumina oxide, gypsum, etc. may be used. These solidify after a certain period of time and reliably reduce the resistance value of the earth electrode.

Taking the above points into consideration, the present invention has developed a structure of the binding metal fitting that can reliably and easily bind multiple ground wires together and can be loosely fitted into the opening at the tip of the hollow rod. I take it as a thing.

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

1 to 3 show a binding fitting 1 used in the ground wire construction method of the present invention, in which a cylindrical harpoon main body 2 has an opening at the tip of a hollow rod 9, which will be described later, in the center of the rear end surface. A regulating rod 3 of a required length that can be loosely inserted into the portion 10 is provided in a protruding manner.

Further, the rear end surface of the cylindrical harpoon body 2 is provided with a plurality of vertical holes 4 into which ground wires 8 (described later) are inserted around the regulating rod 3, and the inner peripheral surface of the holes 4 is provided with a plurality of vertical holes 4 through which the ground wires 8 can be inserted. Anti-slip grooves 7 are carved for prevention. Screw holes 5 are penetrated through the side surface of the cylindrical harpoon body 2, each intersecting the vertical hole 4 from the direction of the center line of the harpoon body 2 at different levels.

Fixing of the binding fitting 1 and the plurality of ground wires 8 is shown in FIG. That is, as shown in FIG. 4, by tightening and fixing the end of the ground wire 8 inserted into the vertical hole 4 with the tightening screw 6 passed through the screw hole 5, the plurality of ground wires 8 are connected to the binding fitting. 1 is integrally fixed.

The plurality of ground wires 8 integrally fixed to the binding metal fitting 1 as described above are buried in the borehole in the following manner and function as a ground electrode.

As shown in FIG. 4, a binding fitting 1 that binds the ends of a plurality of ground wires 8 has a regulating rod 3 protruding from its rear end surface, which is loosely inserted into a tip opening 10 of a hollow rod 9. The hollow rod 9 is inserted into a pre-drilled bore hole 12. The ground wire 8, the main body of which is housed in the winding drum 11, is drawn in by a hollow rod 9 that overlaps and extends over the entire length of the borehole 12, as shown in FIG.

Thereafter, the inserted state between the tip opening 1 of the hollow rod 9 and the regulating rod 3 of the binding metal fitting 1 is released, and the hollow rod 9 is pulled out leaving the ground wire 8 bound and fixed to the binding metal fitting 1. At this time, the reducing agent is injected into the gap between the inserted earth wire 8 and the bore hole 12 to further improve the grounding effect of the earth wire 8 through the tip opening 10 of the hollow rod 9.

In the present invention, due to the structure of the binding fitting 1 and its relationship with the hollow rod 9, the above-described injection of the reducing agent can be carried out efficiently. 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 operation of pulling out the hollow rod 9, the mixing of earth and sand into the solution of the reducing agent 13 due to the collapse of the hole wall in the borehole 12 is minimized. Therefore, the effect of using the reducing agent 13 can be made sufficient.

That is, when pulling out the hollow rod 9, the
The hollow rod 9 is filled with a solution of the reducing agent 13, and as soon as the tip opening 10 of the hollow rod 9 is detached from the binding fitting 1 as shown in FIG. The solution overflows, and the deepest part of the borehole 12 can be injected and filled with a pure solution of the reducing agent 13 that is not contaminated with earth and sand.

Continue to apply the reducing agent 13 to the hollow rod 9 from the rear.
Since the solution is replenished, if the withdrawal speed is adjusted to the amount of outflow from the tip opening 10, the momentum of the outflow is suppressed and the landslide in the borehole 12 can be suppressed. Further, by injecting the solution of the reducing agent 13 in this manner, the solution of the reducing agent 13 can completely replace the circulating water for boring that remains in the borehole 12 during boring of the borehole. That is, since the solution of the reducing agent 13 having a heavy specific gravity pushes up the accumulated water and expels it out of the hole,
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. Thereafter, the solution of reducing agent 13 hardens, and the ground wire 8 is in its final buried state as shown in FIG.

〔Effect of the invention〕

According to the present invention, ground wires such as stranded copper wires and annealed copper wires that can be used in any length as ground electrodes are tied together using a specially structured bundling fitting, and the wires are efficiently buried underground without any connection points. I can do it. 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 electrode, it is possible to simultaneously bury the ground wire underground. The reducing agent can be efficiently filled underground.

Therefore, the ground wire construction method of the present invention does not require any special processing as a ground wire, and commercially available products can be used as they are, resulting in extremely low grounding costs. Since it is used at any length, the electrical connection is stable even when the nearby ground shakes due to earthquakes, etc., and highly reliable grounding can be achieved. Furthermore, by using a reducing agent, a stable grounding effect can be achieved over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a partially transparent perspective view of a ground wire binding fitting used in the ground wire construction method of the present invention;
FIG. 2 is a partially transparent side view of the binding fitting, and FIG. 3 is a partially transparent plan view of the binding fitting. 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. 1... Binding metal fittings, 2... Cylindrical harpoon body, 3...
...Regulation rod, 4...Vertical hole, 5...Screw hole, 6...
...Tightening screw, 7...Slip groove, 8...Ground wire, 9...Hollow rod, 10...Tip opening, 1
1... Winding drum, 12... Boring hole, 1
3...reducing agent.

Claims (1)

[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 opening at the tip of a hollow rod protruding from the center of the rear end surface of the harpoon body; (iii) 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 ends of the harpoon to appropriate lengths; a screw hole for tightening and fixing the end of the ground wire with a tightening screw; (3) insert the end opening of the hollow rod into the ground wire; (4) At the deepest part of the borehole, the said hollow rod is inserted into the regulating rod of the bundling fitting in which the wires are tied, and the bundling fitting in which the ground wire is tied reaches the deepest part of the borehole using the hollow rod. While releasing the inserted state of the regulating rod of the rod and the binding fitting, a reducing agent for reducing the earth resistance value in the borehole is flowed out and filled 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 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 desired number of rods is reduced by solidifying the reducing agent A ground wire construction method characterized by: burying a ground wire in a borehole. 2. The method of constructing a ground wire according to claim 1, wherein the ground wire binding metal fitting has an anti-slip groove on the inner surface of the vertical hole to prevent the ground wire from coming off.