KR100772211B1 - An earthing device fore reducing surge and constructing method thereof - Google Patents

An earthing device fore reducing surge and constructing method thereof Download PDF

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KR100772211B1
KR100772211B1 KR1020060013631A KR20060013631A KR100772211B1 KR 100772211 B1 KR100772211 B1 KR 100772211B1 KR 1020060013631 A KR1020060013631 A KR 1020060013631A KR 20060013631 A KR20060013631 A KR 20060013631A KR 100772211 B1 KR100772211 B1 KR 100772211B1
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South Korea
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ground
surge
copper tube
grounding
ground copper
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KR1020060013631A
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KR20070081595A (en
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김상균
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김상균
김형남
(주)흥산엔지니어링
오용덕
(주)도암엔지니어링건축사사무소
국제전력(주)
(주)대륜엔지니어링
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Priority to KR1020060013631A priority Critical patent/KR100772211B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections

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Abstract

본 발명은 접지 저항 저감재가 균등하게 분포되고, 시간이 흘러도 저감재의 침하 염려가 없고, 시공이 용이하며, 접지 성능이 뛰어난 서지 저감 접지 장치 및 그 시공방법을 제공하기 위한 것으로, 일실시예로서 본 발명의 서지 저감 접지 장치는, 지하로 접지동관을 인입하기 위해 지면에서부터 소정 깊이로 코아홀을 형성하기 위한 굴착수단과; 상기 굴착수단으로 형성된 코아홀에 인입되고, 다수개로 분포된 서지 방사침을 갖는 접지동관과; 상기 접지동관에 구비된 다수의 서지 방사침을 외부로 돌출시키기 위해 접지동관에 연결되는 고압분사수단을 포함하는 것을 특징으로 하고, 서지 저감 접지 시공방법은, 지하로 접지동관을 인입하기 위해 지면에서부터 소정 깊이로 굴착하여 코아홀을 형성하는 단계; 상기 코아홀에 출몰 가능한 다수의 서지 방사침을 갖는 접지동관을 인입하는 단계; 상기 접지동관에 고압분사기를 연결한 후 고압을 접지동관에 가압하여 상기 서지 방사침을 외부로 돌출시키는 단계를 거쳐서 이루어지는 것을 특징으로 한다.The present invention is to provide a surge reduction grounding device and a construction method of the earth resistance reducing material is evenly distributed, there is no fear of subsidence of the reducing material over time, easy construction, and excellent grounding performance, as an embodiment The surge reducing grounding apparatus of the present invention includes: excavating means for forming a core hole from the ground to a predetermined depth for drawing the ground copper tube underground; A ground copper tube drawn into the core hole formed by the excavating means and having a surge radiating needle distributed in plurality; It characterized in that it comprises a high-pressure injection means connected to the ground copper tube for protruding a plurality of surge radiating needles provided in the ground copper tube to the outside, the surge reducing ground construction method, from the ground to draw the ground copper tube underground Excavating to a predetermined depth to form a core hole; Introducing a ground copper tube having a plurality of surge radiating needles which can be mounted in the core hole; After connecting the high-pressure injector to the grounding copper tube is characterized in that the high pressure is applied to the grounding copper tube through the step of protruding the surge radiation needle to the outside.

접지, 서지, 방사침, 접지동관, 젠어스 저감재, 고압분사기, 굴착기 Grounding, Surge, Radiation Needle, Ground Copper Tube, Genus Reducing Material, High Pressure Sprayer, Excavator

Description

서지 저감 접지 장치 및 그 시공방법{An earthing device fore reducing surge and constructing method thereof}An earthing device fore reducing surge and constructing method

본 명세서에서 첨부되는 다음의 도면들은 본 발명의 바람직한 실시예를 예시하는 것이며, 후술하는 발명의 상세한 설명과 함께 본 발명의 기술사상을 더욱 이해시키는 역할을 하는 것이므로, 본 발명은 그러한 도면에 기재된 사항에만 한정되어서 해석되어서는 아니된다.The following drawings, which are attached in this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

도 1 내지 도 5는 본 발명에 따른 서지 저감 접지 장치 및 그 시공방법에 관련된 것으로,1 to 5 relates to a surge reducing grounding apparatus and a construction method thereof according to the present invention,

도 1은 지하에 코아홀을 굴착하는 구성도이고,1 is a configuration diagram for drilling a core hole in the basement,

도 2 및 도 3은 접지동관의 인입 상태도이고,2 and 3 are drawing state of the ground copper tube,

도 4는 접지동관에 고압을 가하는 구성도이고,4 is a configuration diagram applying a high pressure to the grounding copper tube,

도 5는 시공방법을 흐름도로 나타낸 것이다.5 is a flowchart illustrating a construction method.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for main parts of the drawings>

20: 굴착기20: excavator

30: 접지동관30: ground copper tube

32: 서지방사침32: West fat needle

40: 고압분사기40: high pressure jet

50: 어스 저감재50: earth reducing material

60: 접지선60: ground wire

본 발명은 서지(Surge) 저감 접지 시스템에 관한 것으로, 특히 접지 저항 저감재가 균등하게 분포되고, 시간이 흘러도 저감재의 침하 염려가 없고, 시공이 용이하며, 접지 성능이 뛰어난 서지 저감 접지 장치 및 그 시공방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surge reducing grounding system, and particularly, to a surge reducing grounding device having a uniform distribution of grounding resistance reducing materials, and having no fear of settling of the reducing material over time, easy construction, and excellent grounding performance. It is about a method.

전력, 철도, 플랜트, 컴퓨터, 통신, 반도체 그리고 전자산업과 인텔리전트 빌딩 등에 신뢰성 높고 안정적인 접시 시스템이 필수가 되고 있다. 이러한 접지 시스템은 낙뢰로 인한 피해를 방지하기 위한 것으로, 주로 대지에 매설된 방사침을 통하여 뇌전류를 신속히 침투시키는 역할을 한다.Reliable and stable dish systems are essential for the power, rail, plant, computer, communications, semiconductor, electronics and intelligent buildings. This grounding system is intended to prevent damage caused by lightning strikes, and mainly serves to quickly penetrate the brain current through the radiation needle embedded in the ground.

종래, 접지 시스템은 고정형 방사침을 적용하고 있다. 이는 접지봉에 접지저항 저감재로서 방사침이 다수개 고정되어 있는 구조를 가지고 있다. 이러한 경우 접지봉은 지중에 포함된 습기 등에 의해 부식이 일어나 수명이 단축되는 문제를 낳는다.Conventionally, grounding systems employ fixed radiating needles. It has a structure in which a plurality of radiating needles are fixed to the ground rod as a ground resistance reducing material. In this case, the ground rod causes corrosion due to moisture contained in the ground and shortens the life.

또한 접지봉은 설치 후 시간이 지남에 따라 방사침의 부식으로 인해 침하되므로 접지 저항 감소가 일어난다.In addition, ground rods settle due to corrosion of the radiating needle over time after installation, resulting in a decrease in ground resistance.

또한 고정형 방사침의 경우 코아링을 대지에 굴착 후 방사침을 설치할 시 돌출된 방사침에 의해 시공상 불편함이 많게 된다.In addition, in the case of the fixed spinning needle, the construction of the spinning needle is protruded when the spinning needle is installed after excavating the core ring on the ground.

따라서 본 발명은 상기와 같은 제반적인 사정을 감안하여 창출된 것으로, 접지 저항 저감재가 균등하게 분포되고, 시간이 흘러도 저감재의 침하 염려가 없고, 시공이 용이하며, 접지 성능이 뛰어난 서지 저감 접지 장치 및 그 시공방법을 제공함에 그 목적이 있다.Accordingly, the present invention has been made in view of the above-mentioned circumstances, and the earth resistance reducing material is evenly distributed, and there is no fear of subsidence of the reducing material over time, construction is easy, and a surge reduction grounding device having excellent grounding performance and The purpose is to provide the construction method.

상기의 목적을 달성하기 위한 본 발명의 서지 저감 접지 장치는,The surge reduction grounding apparatus of the present invention for achieving the above object,

지하로 접지동관을 인입하기 위해 지면에서부터 소정 깊이로 코아홀을 형성하기 위한 굴착수단과;Excavating means for forming a core hole to a predetermined depth from the ground to draw the ground copper tube underground;

상기 굴착수단으로 형성된 코아홀에 인입되고, 다수개로 분포된 서지 방사침을 갖는 접지동관과;A ground copper tube drawn into the core hole formed by the excavating means and having a surge radiating needle distributed in plurality;

상기 접지동관에 구비된 다수의 서지 방사침을 외부로 돌출시키기 위해 접지동관에 연결되는 고압분사수단을 포함하는 것을 특징으로 한다.It characterized in that it comprises a high-pressure injection means connected to the ground copper tube in order to project a plurality of surge radiating needle provided in the ground copper tube to the outside.

또한, 본 발명에 따르면, 상기 서지방사침은 접지동관의 반경방향으로 일정량 이동가능한 화산봉 형태로 구성된 것을 특징으로 한다.In addition, according to the present invention, the West fat needle is characterized in that it is configured in the form of a volcanic rod movable in a radial amount of the ground copper tube.

또한, 본 발명에 따르면, 상기 접지동관에는 젠어스 저감재를 매개로 접지선이 연결된 것을 특징으로 한다.In addition, according to the present invention, the grounding copper pipe is characterized in that the grounding wire is connected through a genus reducing material.

한편, 본 발명의 서지 저감 접지 시공방법은,On the other hand, the surge reduction ground construction method of the present invention,

지하로 접지동관을 인입하기 위해 지면에서부터 소정 깊이로 굴착하여 코아홀을 형성하는 단계와;Digging a ground hole from the ground to a predetermined depth to introduce a ground copper tube into the base;

상기 코아홀에 출몰 가능한 다수의 서지 방사침을 갖는 접지동관을 인입하는 단계와;Introducing a ground copper tube having a plurality of surge radiating needles which can be mounted in the core hole;

상기 접지동관에 고압분사기를 연결한 후 고압을 접지동관에 가압하여 상기 서지 방사침을 외부로 돌출시키는 단계를 거쳐서 시공되는 것을 특징으로 한다.After connecting the high-pressure injector to the ground copper tube is characterized in that the construction by going through the step of projecting the surge radiation needle to the outside by pressing the high pressure to the ground copper tube.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1에서와 같이 지하(10)로 후술할 접지동관(30)을 인입하기 위해 지면에서부터 소정 깊이로 코아홀(12)을 형성하기 위한 굴착수단으로 굴착기(20)가 구비된다. 상기 굴착기(20)는 일 예로 도 1과 같이 괘도차량 형태의 굴착장비가 될 수 있다.As shown in FIG. 1, an excavator 20 is provided as an excavating means for forming the core hole 12 to a predetermined depth from the ground in order to introduce the ground copper tube 30 to be described later into the basement 10. The excavator 20 may be an excavation equipment in the form of a wheeled vehicle as an example.

상기 굴착기(20)로 형성된 코아홀(12)에는 도 2 및 도 3에서와 같이 다수의 서지 방사침(32)을 갖는 접지동관(30)이 인입된다. 도 2는 접지동관(30)이 지표면에 가까이 매설되어 있는 상태를 나타내고, 도 3은 접지동관(30)이 지표면으로부터 일정 깊이로 인입되어 매설된 상태를 나타낸다.A ground copper tube 30 having a plurality of surge radiating needles 32 is introduced into the core hole 12 formed with the excavator 20 as shown in FIGS. 2 and 3. 2 illustrates a state in which the ground copper tube 30 is buried close to the ground surface, and FIG. 3 illustrates a state in which the ground copper tube 30 is inserted and embedded in a predetermined depth from the ground surface.

여기서 도 2와 같이 접지동관(30)은 확관을 이루는 접속부(30a)를 통해 길이방향으로 연결될 수 있다.Here, as shown in FIG. 2, the ground copper pipe 30 may be connected in the longitudinal direction through the connection part 30a constituting the expansion pipe.

이때, 서지 방사침(32)은 도 2 및 도 3의 확대도에서와 같이 접지동관(30)에 길이 방향에 걸쳐서 균일하게 다수 분포되어 있다. 또한 서지 방사침(32)은 접지동관(30)에서 반경 방향으로 출몰 가능하게 설치되어 있다.At this time, the surge radiation needle 32 is uniformly distributed in the ground copper tube 30 in the longitudinal direction as shown in the enlarged view of FIGS. In addition, the surge radiating needle 32 is installed to be able to project in the radial direction from the ground copper tube (30).

서지 방사침(32)은, 그의 일단이 상기 접지동관(30)의 내경부에 걸림되는 걸 림턱(32a)과 그의 타단에 서지 방전을 일으키기 용이하도록 예리한 침부(32b)를 형성하고 있다. 이때 침부(42b)는 다수개로 구성되거나 화산봉 형태로 구성될 수 있다.The surge radiation needle 32 forms a locking jaw 32a whose one end is engaged with the inner diameter portion of the ground copper tube 30 and a sharp needle 32b so as to easily cause a surge discharge at the other end thereof. At this time, the needle 42b may be configured in plural or in the form of a volcanic rod.

따라서 서지 방사침(32)은 시공전에는 도 2 및 도 3의 확대도에 점선으로 나타난 바와 같이 접지동관(30)의 내부에 위치하고 있다가 시공 후에는 접지동관(30)에서 반경방향으로 돌출하여 서지 방전이 이루어지게 되어 있다.Therefore, the surge radiation needle 32 is located inside the ground copper tube 30 as shown by the dotted lines in the enlarged view of FIGS. 2 and 3 before construction, and then surges protruding radially from the ground copper tube 30 after construction. The discharge is to be made.

상기 접지동관(30)에 구비된 다수의 서지 방사침(32)을 시공 후 외부로 돌출시키기 위해 접지동관(30)에 연결되는 고압분사기(40)가 구비된다. 고압분사기(40)는 도 4와 같이 차량에 탑재하여 이동형으로 사용될 수 있다.The high pressure sprayer 40 is connected to the ground copper tube 30 to protrude outwards after the construction of the plurality of surge radiating needles 32 provided in the ground copper tube 30. The high pressure injector 40 may be mounted on a vehicle as shown in FIG. 4 and used as a mobile type.

또한 상기 접지동관(30)에는 시공시에 어스 저감재(50)를 매개로 접지선(60)과 접속됨이 바람직하다.In addition, the ground copper tube 30 is preferably connected to the ground wire 60 through the earth reducing material 50 during construction.

이와 같이 구성된 서지 저감 접지 시공 장치를 이용한 시공 방법을 도 5를 참조하여 설명한다.A construction method using the surge reduction ground construction apparatus configured as described above will be described with reference to FIG. 5.

먼저, 지하(10)로 접지동관(30)을 인입하기 위해 지면에서부터 소정 깊이로 굴착기(20)를 이용하여 코아홀(12a)을 형성한다.First, the core hole 12a is formed by using the excavator 20 at a predetermined depth from the ground in order to introduce the ground copper tube 30 into the basement 10.

다음, 코아홀(12a)에 출몰 가능한 다수의 서지 방사침(32)을 갖는 접지동관(30)을 인입하여 매설한다. 이때 서지 방사침(32)은 도 2에서와 같이 접지동관(30)내로 들어가 있는 상태로 인입된다.Next, a ground copper tube 30 having a plurality of surge radiating needles 32 that can be sunk in the core hole 12a is introduced and embedded. At this time, the surge radiation needle 32 is introduced into the ground copper tube 30 as shown in FIG.

따라서 접지동관(30)이 코아홀(12a)에 진입할 때는 밖으로 나오지 않으므로 시공이 용이하게 된다.Therefore, when the ground copper tube 30 enters the core hole 12a, it does not come out, so construction is easy.

그 다음 상기 접지동관(30)에 고압분사기(40)를 연결한 후 고압을 접지동관(30)내에 가하게 된다. 이렇게 되면 서지 방사침(32)이 고압에 의해 접지동관(30)의 외부로 돌출되어 포설된다.Then, after connecting the high-pressure injector 40 to the ground copper tube 30, a high pressure is applied to the ground copper tube 30. In this case, the surge radiating needle 32 protrudes out of the ground copper tube 30 by high pressure and is installed.

이같이 서지 방사침(32)의 포설이 완료되면, 균등한 분포에 의해 시간이 흘러도 침하 우려가 없게 된다.When the surge radiation needle 32 is laid in this manner, there is no fear of settling even if time passes by an even distribution.

특히, 도 1과 같이 토양층의 화산암이나 송이층(화산쇄설물층)(11)에 서지 방사침(32)이 분포되어 탁월한 접지 효과가 발휘된다.In particular, the surge radiation needle 32 is distributed in the volcanic rock and the cluster layer (volcanic sediment layer) 11 of the soil layer as shown in FIG. 1, thereby exhibiting an excellent grounding effect.

한편, 상기 접지동관(30)에는 접지선(60)이 어스 저감재(50)를 매개로 접속되어 가장 낮는 접지 저항을 얻을 수 있다.On the other hand, the ground copper tube 30 is connected to the ground wire 60 through the earth reducing material 50 can be obtained the lowest ground resistance.

이상과 같이, 본 발명은 비록 한정된 실시예와 도면에 의해 설명되었으나, 본 발명은 이것에 의해 한정되지 않으며, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 본 발명의 기술사상과 아래에 기재될 청구범위의 균등범위 내에서 다양한 수정 및 변형이 가능함은 물론이다.As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

상술한 바와 같이 본 발명의 서지 저감 접지 시공장치 및 그 시공방법에 따르면, 서지방사침이 균등하게 분포되어 시공 후 시간이 지나도 침하 우려가 없어 수명 향상 효과가 있다. 또한 서지방사침이 굴착 개소로 진입할때에는 접지동관 밖으로 나오지 않으므로 시공이 용이하다. 또한 화산암이나 송이층에 서지방사침을 분사시켜 줌으로 탁월한 접지효과를 발휘하게 된다.As described above, according to the surge reducing grounding apparatus and the construction method of the present invention, the sedimentation needles are distributed evenly, and there is no fear of subsidence even after time of construction, thereby improving the lifespan. In addition, it is easy to install because the West District needle does not come out of the ground copper tube when entering the excavation site. In addition, by spraying the western fat needle on the volcanic rocks and clusters, it shows excellent grounding effect.

Claims (6)

서지 저감 접지를 시공하기 위한 장치에 있어서,In the apparatus for constructing a surge reducing ground, 지하로 접지동관(30)을 인입하기 위해 지면에서부터 소정 깊이로 코아홀(12a)을 형성하기 위한 굴착수단과;Excavating means for forming a core hole (12a) to a predetermined depth from the ground to draw the ground copper tube (30) underground; 상기 굴착수단으로 형성된 코아홀(12a)에 인입되고, 다수개로 분포된 서지 방사침(32)을 갖는 접지동관(30)과;A ground copper tube (30) drawn into the core hole (12a) formed by the excavating means and having a surge radiating needle (32) distributed in plurality; 상기 접지동관(30)에 구비된 다수의 서지 방사침(32)을 외부로 돌출시키기 위해 접지동관(30)에 연결되는 고압분사수단을 포함한 것을 특징으로 하는 서지 저감 접지 장치.Surge reducing grounding device, characterized in that it comprises a high-pressure injection means connected to the grounding copper tube (30) to protrude to the outside a plurality of surge radiating needle (32) provided in the grounding copper tube (30). 제 1항에 있어서,The method of claim 1, 상기 서지방사침(32)은 접지동관(30)의 반경방향으로 일정량 이동가능한 화산봉 형태로 구성된 것을 특징으로 하는 서지 저감 접지 장치.The West fat needle 32 is a surge reducing grounding device, characterized in that configured in the form of a volcanic rod movable in a radial amount of the ground copper tube (30). 제 1항에 있어서,The method of claim 1, 상기 접지동관(30)에는 젠어스 저감재(50)를 매개로 접지선(60)이 연결된 것을 특징으로 하는 서지 저감 접지 장치.Surge reducing grounding device, characterized in that the grounding wire (60) is connected to the ground copper tube (30) via a genus reducing material (50). 서지 저감 접지를 시공하기 위한 방법에 있어서,In the method for constructing a surge reducing ground, 지하로 접지동관(30)을 인입하기 위해 지면에서부터 소정 깊이로 굴착하여 코아홀(12a)을 형성하는 단계와;Excavating to a predetermined depth from the ground to draw the ground copper tube (30) underground to form a core hole (12a); 상기 코아홀(12a)에 출몰 가능한 다수의 서지 방사침(32)을 갖는 접지동관(30)을 인입하는 단계와;Introducing a ground copper tube (30) having a plurality of surge radiating needles (32) which can be mounted in the core hole (12a); 상기 접지동관(30)에 고압분사기(40)를 연결한 후 고압을 접지동관(30)에 가압하여 상기 서지 방사침(32)을 외부로 돌출시키는 단계를 거쳐서 이루어지는 것을 특징으로 하는 서지 저감 접지 시공방법.After connecting the high pressure injector 40 to the ground copper tube 30, the high pressure is applied to the ground copper tube 30, the surge reduction ground construction characterized in that the step of protruding the surge radiating needle 32 to the outside Way. 제 4항에 있어서,The method of claim 4, wherein 상기 서지방사침(32)은 접지동관(32)에서 반경방향으로 일정량 이동가능한 화산봉 형태로 제작된 것을 특징으로 하는 서지 저감 접지 시공방법.The West fat needle 32 is a surge reducing ground construction method, characterized in that made in the form of volcanic rods that can be moved in a predetermined amount in the radial direction from the ground copper tube (32). 제 4항에 있어서,The method of claim 4, wherein 상기 접지동관(30)에는 접지선(60)이 어스 저감재(50)를 매개로 접속된 것을 특징으로 하는 서지 저감 접지 시공방법.The grounding copper pipe 30 is a surge reduction grounding construction method, characterized in that the grounding wire 60 is connected via an earth reducing material (50).
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KR100958536B1 (en) 2008-04-18 2010-05-18 이수규 Boring screw device for earthing bar reclamation and ground connection reduction stuff injection

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KR100940601B1 (en) * 2009-01-12 2010-02-04 (주)광진 Excavator, device and method for reducing ground resistance of the same

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KR200253293Y1 (en) 2001-05-21 2001-11-16 이순초 Copper Pipe with Holes for Grounding
KR20030092990A (en) * 2002-05-31 2003-12-06 김홍삼 Grounding system of circle type earth bar.
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JPH01157074A (en) * 1987-12-14 1989-06-20 Nippon Telegr & Teleph Corp <Ntt> Low resistance grounding
KR200253293Y1 (en) 2001-05-21 2001-11-16 이순초 Copper Pipe with Holes for Grounding
KR20030092990A (en) * 2002-05-31 2003-12-06 김홍삼 Grounding system of circle type earth bar.
KR20040107862A (en) * 2003-06-14 2004-12-23 주식회사 티지오 Manhole Grounding Structure
KR200340357Y1 (en) 2003-10-21 2004-02-05 (주)신원전기 Digging structure of a ground pipe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100958536B1 (en) 2008-04-18 2010-05-18 이수규 Boring screw device for earthing bar reclamation and ground connection reduction stuff injection

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