JP3326552B2 - Multi-stage deep buried ground electrode - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multi-stage deeply buried ground electrode.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 8-78129 discloses
Multiple ground electrodes were buried in one trench
Is known.

In such an example, the ground resistance of each ground electrode is
When tracking and measuring whether the resistance is at the desired value
Separate each ground electrode and increase the ground resistance of one ground electrode to another.
The tracking measurement can be performed using the ground electrode of FIG.

[0004]

However, the ground electrode
In operation, each ground electrode can be separated from each other.
And measure the low ground resistance of each ground electrode as described above
You will not be able to do it. Also, as described above,
If a ground electrode is provided only on the local area
In some cases, a low ground resistance could not be obtained.

The present invention has been made to eliminate such disadvantages.
Things.

[0006]

SUMMARY OF THE INVENTION A multistage deep buried ground of the present invention
Electrodes shall be insulated wires from the surface to different depths.
And the lower part of the hole is
More than two buried ground electrodes and two auxiliary electrodes
It is characterized by comprising .

The ground electrode and the auxiliary electrode are separated from each other.
Are buried in multiple pits with the same depth.
The ground electrodes are electrically connected to each other at the surface
It is characterized by the following.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, H is a pit having a diameter D and a depth L3. The ground electrodes 1, 2, and 3 are buried to the depths L1, L2, and L3 in the trench H, respectively. The ground electrodes 1, 2, and 3 are located at depths T1, T2, and T, respectively, from the ground surface.
3 is covered with an insulating material, and a depth L1 thereunder,
The remaining lengths E1, E2, and E3 up to L2 and L3 are constituted by a bare wire or a wire made of a grounding material that forms a ground pole.

That is, in each of the electric wires 1, 2, and 3, the lengths E1, E2, and E3 of the lower ends are effective grounding portions. The section S1 in the figure is a ground potential spread prevention insulating section between the effective ground section of the ground electrode 1 and the effective ground section of the ground electrode 2. Similarly, the section S2 is an effective ground of the ground electrode 2. This is an insulating portion for preventing the spread of the ground potential between the portion and the effective ground portion of the ground electrode 3. In this way, the hole H
In this case, three ground electrodes 1, 2, and 3 grounded at different depths from each other are embedded, and these three ground electrodes 1, 2, and 3 are mutually used as auxiliary electrodes. Enables tracking measurement of ground resistance. Also, in FIG.
Reference numeral 5 denotes two auxiliary grounding electrodes embedded for measuring grounding resistance. A grounding electrode having a length of about 0.5 to 1.0 m is formed at the tip of the fine wire, and the grounding electrodes are separated from each other.
In the operation state where it cannot be performed, each ground electrode 1, 2,
Used as an auxiliary ground when tracking and measuring the ground resistance of 3
Can be One of the auxiliary ground electrodes 4 is used for measuring the ground resistance.
A current-carrying auxiliary ground electrode is used, and the other 5 is a voltage detection auxiliary ground electrode.
Used as an electrode.

The grounding work according to this embodiment includes forming ground electrodes on various underground geology, burying the ground electrodes deep underground, preventing various potentials on the ground surface from spreading deep into the ground, Since the construction involves construction and the grounding pole configuration involves construction methods, the common names are "multi-stage deep burial grounding", "multi-stage deep burial earth", and "multi-stage deep burial earth". ”,“ Multi-stage multi-ground ”,“ Multi-stage multi-earth ”,“ Multi-stage multi-stage ”,
"Multi-layered multi-layer grounding", "Deep multi-layer grounding", "Deep multi-layer grounding", "Deep multi-layer grounding", "Deep multi-layer grounding", "Multi-layer deep grounding", "Multi-layer deep grounding",
"Multi deep grounding", "Multi deep deep", "Multi deep deep grounding", "Multi deep deep grounding", "Multi deep deep grounding", "Multi deep deep earth", "Multi deep deep buried clean ground" Construction, multi-stage deep buried clean grounding, multi-stage clean grounding, multi-stage clean grounding, multi-stage deep clean grounding,
"Multi-level deep clean grounding", "Multi-level deep clean grounding", "Multi-level deep clean grounding", "Multi-level deep clean grounding", "Multi-level deep clean grounding", "Multi-level deep clean ground", "Multi-level deep ground" It can be read as "clean earth work", "multi-stage grounding with a built-in grounding measurement electrode", "multi-stage deep grounding boring work".
Can be read as “grounding method”.

A method of calculating the ground resistance will be described. In order to obtain the values of the ground resistances of the ground electrodes 1, 2, and 3 in the trench H of FIG.
As the drill is drilled, the ground resistance of the drill pipe is measured each time the drill pipe is extended, and the value of the ground resistance at each depth is recorded as a measurement table. Next, for example, the ground resistance at the length E1 from the depth T1 to the depth L1 in the case of the ground electrode 1 is R _E1 , the measured resistance up to the depth T1 is R _T1, and the measured resistance up to the depth L1 is R _L1.
Then, the ground resistance _RE1 is obtained by the following equation.

[0013]

## EQU1 ## R _E1 = (R _T1 × R _L1 ) / (R _T1 −R _L1 )

[0014] Incidentally, in the embodiment of FIG. 1, when the grounding resistance of sufficiently low value just one Horiana H in is not obtained
As shown in FIG. 2, one or more trenches H are further provided, ground electrodes having the same configuration are buried in each of them, and they are connected in parallel with each other to obtain a desired ground resistance value . <br/> In FIG. 2 , Ha and Hb are boreholes having a diameter D and a depth L3, respectively, and have ground electrodes 1 and 2, respectively, having the same dimensions as the ground electrodes 1, 2, 3 and the auxiliary ground electrodes 4, 5 in FIG.
a, 2a, 3a, ground electrodes 1b, 2b, 3b, auxiliary ground electrode 4
a, 5a, 4b, and 5b are embedded.

The ground electrodes 1a, 2a, 3a and the ground electrode 1
b, 2b, 3b are connected in parallel to each other at the top and are taken out as ground electrodes 1, 2, 3. The ground resistance obtained here has a resistance value that is approximately １ ／ of that in the case of one hole H.

In order to obtain a lower value of the ground resistance, it is possible to increase the number of ground poles in parallel by increasing the number of excavated holes. Note that this embodiment can be referred to as “multi-stage parallel grounding”, “parallel multi-stage grounding work”, or “parallel multi-stage multi-stage clean earth”. These names are "parallel" to the names of the embodiment of FIG.
Is added.

In FIG. 1, when a large current flows through the ground electrode 1, an induced voltage is induced in the ground electrodes 2 and 3 by the magnetic flux φ generated in the portion up to the depth L1. The induced voltage is about 0.235 V at a current value of 100 A per 10 m, and the induced voltage generated at the other ground electrodes 2 and 3 buried in the trench H is small and negligible. The later-described parallel coefficient η between R _T1 and R _L1 does not have a great difference in the error range of the ground resistance measuring instrument, and the safety is sufficiently maintained even if it is ignored. In addition, when waterproofing measures are taken for the insulating portions of the ground electrodes 1, 2, and 3, the corrosion resistance against natural corrosion and electric corrosion in the insulated inner wire portion is improved.

[0018]

According to the present invention as described above, according to the present invention, Horiana
A current-carrying auxiliary ground electrode for measuring ground resistance and a ground
Since the voltage detection auxiliary grounding electrode for resistance measurement is buried,
When tracking each ground resistance in the use condition, for each measurement
Eliminates the need for auxiliary poles, making it easy to measure ground resistance
become.

Further , in the present invention, a pit having the same depth is provided.
Excavated two or more, and each of them has a ground electrode with the same configuration
Buried combination of the same ground electrode on the ground surface
Are connected in parallel to form a ground electrode,
If the grounding resistance cannot be obtained at
Will be possible. Ground electrodes buried underground, for example, two poles
In the case of parallel combination connection, if the grounding interval of the two poles is close,
The effective range of each ground overlaps and overlaps
Part becomes an invalid range that does not contribute to the reduction of ground resistance,
In terms of gas engineering, it is expressed as a set coefficient or a parallel coefficient η.
Instead of becoming 1/2 like the parallel composite value of electric resistance, (1
× η) / 2 to reduce by η times. Ground electrode spacing
If η is large, η is close to 1;
Are overlapped, and the ground resistance is
It will not be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a multi-stage deeply buried ground electrode of the present invention.

FIG. 2 is a sectional view showing another embodiment of the multi-stage deeply buried ground electrode of the present invention.

[Explanation of symbols]

 1, 2, 3 Ground electrode 4, 5 Auxiliary ground electrode 1a, 2a, 3a Ground electrode 1b, 2b, 3b Ground electrode 4a, 5a Auxiliary ground electrode 4b, 5b Auxiliary ground electrode H, Ha, Hb

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 4/66

Claims (2)

(57) [Claims] An insulated wire extending from the ground surface to different depths from each other, and a moat having a ground electrode component below the insulated wire.
Two or more ground electrodes and two auxiliary electrodes embedded in the hole
And a multi-stage deeply buried ground electrode. 2. The ground electrode and the auxiliary electrode are separated from each other.
Are buried in multiple pits with the same depth.
The ground electrodes are electrically connected to each other at the surface
The multi-stage deeply buried ground electrode according to claim 1, wherein: