KR102631023B1 - Grounding rod for electric pole, Device and Method for installing the same - Google Patents
Grounding rod for electric pole, Device and Method for installing the same Download PDFInfo
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- KR102631023B1 KR102631023B1 KR1020210179636A KR20210179636A KR102631023B1 KR 102631023 B1 KR102631023 B1 KR 102631023B1 KR 1020210179636 A KR1020210179636 A KR 1020210179636A KR 20210179636 A KR20210179636 A KR 20210179636A KR 102631023 B1 KR102631023 B1 KR 102631023B1
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- Prior art keywords
- grounding
- rod
- ground
- construction device
- grounding rod
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- 238000000034 method Methods 0.000 title claims description 4
- 238000010276 construction Methods 0.000 claims abstract description 89
- 238000009412 basement excavation Methods 0.000 claims description 39
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 37
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 13
- 239000010949 copper Substances 0.000 abstract description 13
- 229910052802 copper Inorganic materials 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/40—Connection to earth
-
- 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
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- Manufacturing Of Electrical Connectors (AREA)
Abstract
본 발명은 전주용 접지봉과 그 시공장치 및 시공방법에 관한 것으로, 관형 접지봉의 내부로 시공장치를 삽입하고, 시공장치를 항타하여 접지봉을 지중에 매설한다. 접지봉에 고강성이 필요 없게 되어 접지봉을 저항이 작은 순동 재질로 제작할 수 있고, 시공장치를 항타하여 접지봉을 매설하므로 접지봉을 더욱 깊이 매설할 수 있다.The present invention relates to a grounding rod for an electric pole, its construction device, and a construction method. The construction device is inserted into the interior of a tubular grounding rod, and the construction device is driven to bury the grounding rod in the ground. Since there is no need for high rigidity in the grounding rod, the grounding rod can be made of pure copper material with low resistance, and since the grounding rod is buried by driving the construction device, the grounding rod can be buried more deeply.
Description
본 발명은 전주용 접지봉과 그 시공장치 및 시공방법에 관한 것이다.The present invention relates to a grounding rod for an electric pole, its construction equipment, and a construction method.
전주에는 피뢰기, 중성선, 변압기 2차측 등 접지가 필요한 설비들이 있으며, 이들 설비들의 접지선은 하나의 접지선에 연결되어 지하에 매설된 접지봉에 연결된다. 이러한 전주 접지는 소정의 접지저항값을 만족하도록 규정되어 있으며, 접지저항값을 만족시키기 위해 접지봉의 매설 깊이와 위치 및 매설 개소 수를 달리하여 시공하고 있다.There are facilities on electric poles that require grounding, such as lightning arresters, neutral wires, and the secondary side of transformers, and the grounding wires of these facilities are connected to a single grounding wire and connected to a grounding rod buried underground. Such pole grounding is regulated to satisfy a predetermined grounding resistance value, and is constructed by varying the burial depth, location, and number of buried points of the grounding rod to satisfy the grounding resistance value.
종래에는 접지봉을 (전동)브레이커로 직접 타격하여 지중으로 삽입하였다. 또한 이때 접지저항 감소 및 동결심도 만족을 위해 지면을 약 0.75m 이상 굴착하고, 접지봉을 타격하여 박아 넣은 후 접지봉(의 리드선)과 접지선을 연결하였다. 그리고 파낸 흙을 되메우기하여 전주 접지 공사를 마무리하였다.Conventionally, the grounding rod was inserted into the ground by directly striking it with an (electric) breaker. Also, at this time, in order to reduce grounding resistance and satisfy the freezing depth, the ground was excavated to about 0.75 m or more, a grounding rod was driven in, and then the grounding rod (its lead wire) and the grounding wire were connected. Then, the grounding work for Jeonju was completed by backfilling the excavated soil.
그런데 종래의 접지봉은 강봉 표면에 구리(Cu)를 도금한 것으로 강성이 부족하여 항타시 쉽게 변형됨으로서 깊이 매설하기가 곤란하였다.However, the conventional grounding rod was made by plating copper (Cu) on the surface of the steel rod, and it lacked rigidity and was easily deformed when driving, making it difficult to bury it deeply.
또한 지중으로 삽입되면서 흙, 돌 등에 긁혀 표면의 구리층이 벗겨지게 되는데, 이 때문에 접지봉의 자체 저항이 증가하여 규정 접지저항값을 만족시키기 어려웠다.In addition, as it was inserted into the ground, it was scratched by dirt, stones, etc., causing the copper layer on the surface to peel off. Because of this, the self-resistance of the grounding rod increased, making it difficult to meet the specified grounding resistance value.
또한 구리층이 파괴됨으로써 내부 강재의 산화가 급속도로 이루어지며, 이에 시공 후 2~3년이 경과하면 접지 성능이 상실되어 재시공이 필요하였다.In addition, as the copper layer was destroyed, the internal steel oxidized rapidly, and grounding performance was lost 2 to 3 years after construction, necessitating re-construction.
또한 상기와 같이 접지봉을 깊이 박아 넣기 어려울 뿐만 아니라 접지봉과 접지선의 연결부가 지면 아래에 위치해야 하기 때문에 반드시 지면 굴착이 선행되어야만 하였다.In addition, as mentioned above, not only was it difficult to drive the grounding rod deeply, but the connection between the grounding rod and the grounding wire had to be located below the ground, so ground excavation had to be done first.
이에 본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로, 순수 동 재질의 접지봉을 보다 깊이 매설할 수 있게 되고, 이에 접지저항 규정을 만족하기가 용이하며, 접지봉 조기 산화에 따른 재시공이 방지될 뿐만 아니라 굴착이 필요 없는 전주용 접지봉과 그 시공장치 및 시공방법을 제공함에 목적이 있다.Accordingly, the present invention was developed to solve the above problems. It makes it possible to bury the grounding rod made of pure copper material more deeply, making it easier to meet the grounding resistance regulations, and preventing re-construction due to premature oxidation of the grounding rod. In addition, the purpose is to provide grounding rods for electric poles that do not require excavation, as well as construction equipment and construction methods.
상기와 같은 목적을 달성하기 위한 본 발명에 따른 접지봉은, 직선형 관 형상으로 형성되고, 순 동 재질로 제작된다.The grounding rod according to the present invention for achieving the above object is formed in a straight tube shape and is made of pure copper material.
상기 관의 상부 측면에 리드선이 연결된다.A lead wire is connected to the upper side of the pipe.
상기 관의 상단에 또 다른 관의 하단이 삽입될 수 있도록 확관부가 형성된다.An expansion portion is formed at the top of the tube so that the lower end of another tube can be inserted.
또한, 본 발명에 따른 접지봉 시공장치는, 직선형 관 형상의 접지봉에 삽입되어 뾰족한 형상의 선단부가 접지봉의 하단 외측으로 돌출되는 굴착부와, 상기 굴착부의 상단에 나사 구조로 결합되어 브레이커에 의해 항타되고 상기 접지봉을 밀어주는 항타부를 포함한다.In addition, the grounding rod construction device according to the present invention includes an excavation part that is inserted into a straight tubular grounding rod and the pointed end protrudes outward from the bottom of the grounding rod, and is coupled to the upper end of the excavation part in a screw structure and driven by a breaker. It includes a driving part that pushes the ground rod.
상기 항타부와 선단부가 뾰족한 굴착부 사이에 연결용 굴착부가 필요한 개수로 연결될 수 있다.The required number of connection excavations may be connected between the driving portion and the excavation portion with a pointed tip.
상기 항타부의 외경은 접지봉의 외경보다 크게 형성된다.The outer diameter of the driving part is formed to be larger than the outer diameter of the ground rod.
또한, 본 발명에 따른 접지봉 시공방법은, 접지봉에 시공장치의 굴착부를 삽입하여 시공장치에 접지봉을 결합하는 접지봉과 시공장치 결합단계;In addition, the ground rod construction method according to the present invention includes the step of combining the ground rod and the construction device by inserting the excavation part of the construction device into the ground rod and coupling the ground rod to the construction device;
상기 시공장치의 항타부를 항타하여 접지봉을 지중에 일부 삽입하는 접지봉 부분삽입단계;A ground rod partial insertion step of partially inserting the ground rod into the ground by driving the driving unit of the construction device;
상기 시공장치를 분리하고 접지봉에 접지선을 가연결한 후 접지저항을 측정하여 접지저항 규정치를 만족하는지 여부를 판단하는 접지저항 규정치 만족 판단단계;A grounding resistance standard satisfaction determination step of separating the construction device, temporarily connecting a grounding wire to a grounding rod, and then measuring the grounding resistance to determine whether the grounding resistance standard value is satisfied;
상기 접지저항 규정치 만족 판단단계에서 접지저항이 규정치를 만족할 경우 접지봉에 리드선을 연결하는 리드선 연결단계;A lead wire connection step of connecting a lead wire to a ground rod when the ground resistance satisfies the specified value in the ground resistance regulation value satisfaction determination step;
상기 시공장치의 항타부를 항타하여 접지봉을 지중에 완전히 삽입하는 접지봉 완전삽입단계;A ground rod complete insertion step of completely inserting the ground rod into the ground by driving the driving unit of the construction device;
상기 접지봉에서 시공장치를 분리하여 제거하는 시공장치 분리단계;A construction device separation step of separating and removing the construction device from the ground rod;
상기 리드선의 지면 위쪽 단부에 전주의 접지선을 연결하고, 접지선을 가려주는 보호구를 전주에 설치하는 접지선 연결 및 보호구 설치단계;를 포함한다.It includes a ground wire connection and protective equipment installation step of connecting the ground wire of the electric pole to the end of the lead wire above the ground, and installing protective equipment to cover the ground wire on the electric pole.
상기 접지저항 규정치 만족 판단단계에서 측정값이 접지저항 규정치를 만족하지 않으면 선 삽입된 접지봉에 또 다른 접지봉을 연결하여 접지봉의 전체 길이를 연장하고, 상기 시공장치는 선단용 굴착부와 항타부의 사이에 연결용 굴착부를 설치하여 굴착부의 전체 길이를 연장하는 접지봉과 시공장치 길이 연장단계를 실시한다.If the measured value does not satisfy the ground resistance regulation value in the step of determining whether the ground resistance regulation value is satisfied, another grounding rod is connected to the pre-inserted grounding rod to extend the total length of the grounding rod, and the construction device is installed between the excavation part for the tip and the driving part. A ground rod and construction device length extension step is performed to extend the entire length of the excavation section by installing the connection excavation section.
상기 시공장치 분리단계 이후에 접지저항저감제를 물과 혼합하여 시공장치를 제거한 홀 내부로 부어 넣는 접지저항저감제 주입단계를 더 실시할 수 있다.After the step of separating the construction device, a grounding resistance reducing agent injection step may be further performed in which the grounding resistance reducing agent is mixed with water and poured into the hole from which the construction device was removed.
이상 설명한 바와 같은 본 발명에 따르면, 또한 고강성의 시공장치에 접지봉을 결합하고 시공장치를 타격하여 접지봉을 매설함으로써 접지봉을 필요한 만큼 깊이 매설할 수 있게 된다.According to the present invention as described above, the grounding rod can be buried as deep as necessary by combining the grounding rod with a high-rigidity construction device and striking the construction device to bury the grounding rod.
또한 동일한 이유에 의해 접지봉 자체는 고강성을 갖출 필요가 없음으로써 접지봉을 순수 구리 재질로 제작할 수 있게 된다.Also, for the same reason, the ground rod itself does not need to have high rigidity, so the ground rod can be made of pure copper.
따라서 접지봉 매설시 접지저항 규정을 만족하기가 용이하다.Therefore, it is easy to satisfy the grounding resistance regulations when embedding the grounding rod.
또한 순수 구리 재질의 접지봉은 항타중 표면층이 다소 손상되어도 강 재질을 포함하고 있지 않으므로 산화에 따른 접지봉 기능 상실 문제가 발생하지 않으며, 이에 접지봉을 재시공할 필요가 없게 된다.In addition, a grounding rod made of pure copper does not contain steel material even if the surface layer is somewhat damaged during driving, so there is no problem of loss of grounding rod function due to oxidation, and there is no need to reinstall the grounding rod.
또한 상기 시공장치 사용으로 인해 리드선이 결합된 상태의 접지봉을 지면 아래쪽으로 박아 넣을 수 있게 됨으로써 접지봉 타격 전에 미리 굴착을 해 놓을 필요가 없게 된다. 즉, 접지봉의 무굴착 시공이 가능하다.In addition, the use of the above-mentioned construction device allows the grounding rod with the lead wire coupled to it to be driven into the ground below, thereby eliminating the need for prior excavation before striking the grounding rod. In other words, non-dig construction of the ground rod is possible.
도 1의 (a),(b),(c)는 각각 본 발명에 따른 접지봉, 시공장치, 접지봉과 시공장치의 사용 상태를 도시한 도면.
도 2의 (a),(b),(c)는 각각 길이 연장형 접지봉과 시공장치 및 이들의 사용 상태를 도시한 도면.
도 3의 (a),(b)는 상기 접지봉의 수직 매설 상태를 도시한 도면.
도 4의 (a),(b)는 상기 접지봉의 경사 매설 상태를 도시한 도면.
도 5는 본 발명에 따른 접지봉 시공방법의 순서도.Figures 1 (a), (b), and (c) are diagrams showing the use state of the grounding rod, the construction device, and the grounding rod and construction device according to the present invention, respectively.
Figures 2 (a), (b), and (c) are diagrams showing an extended grounding rod, a construction device, and their state of use, respectively.
Figures 3 (a) and (b) are diagrams showing the vertically buried state of the grounding rod.
Figures 4 (a) and (b) are diagrams showing an inclined buried state of the grounding rod.
Figure 5 is a flow chart of the grounding rod construction method according to the present invention.
본 발명은 다양한 변경을 가할 수 있고 여러 가지 실시예를 가질 수 있는 바, 특정 실시예들을 도면에 예시하고 상세하게 설명하고자 한다. 그러나, 이는 본 발명을 특정한 실시 형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변경, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다. 첨부된 도면에 도시된 선들의 두께나 구성요소의 크기 등은 설명의 명료성과 편의를 위해 과장되게 도시되어 있을 수 있다.Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. The thickness of lines or sizes of components shown in the attached drawings may be exaggerated for clarity and convenience of explanation.
또한, 후술되는 용어들은 본 발명에서의 기능을 고려하여 정의된 용어들로서 이는 사용자, 운용자의 의도 또는 판례에 따라 달라질 수 있다. 그러므로 이러한 용어들에 대한 정의는 본 명세서 전반에 걸친 내용을 토대로 하여 내려져야 할 것이다.In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention of the user or operator or precedent. Therefore, definitions of these terms should be made based on the content throughout this specification.
이하, 본 발명에 따른 바람직한 실시예를 첨부된 도면을 참조하여 상세하게 설명한다.Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.
도 1(a)와 같이, 본 발명에 따른 접지봉(1)은 단순 직선형 원형관 형태를 가진다.As shown in Figure 1(a), the grounding rod 1 according to the present invention has a simple straight circular tube shape.
또한 접지봉(1)은 순수 동(CU) 재질로 제작된다. 이는 접지저항값을 감소시켜 접지저항 규정치를 만족시키는데 도움을 준다.Additionally, the grounding rod (1) is made of pure copper (CU) material. This reduces the ground resistance value and helps satisfy the ground resistance standard.
접지봉(1)의 상단부 측면에는 리드선(2)이 연결될 수 있다. 리드선(2)은 전주에서 내려오는 접지선과 연결(압착 슬리브 사용)을 용이하게 하기 위해 구비되는 것으로 용접, 슬리브 압착, 나사 조임형 클램프 등을 이용하여 접지봉(1)에 연결될 수 있다.A lead wire (2) may be connected to the upper side of the ground rod (1). The lead wire (2) is provided to facilitate connection (using a compression sleeve) with the ground wire coming down from the electric pole, and can be connected to the ground rod (1) using welding, sleeve compression, screw-fastening clamps, etc.
도 1(b)와 같이, 본 발명에 따른 시공장치(10)는 끝부분이 뾰족하고 전체적으로 직선 형상으로 이루어진 굴착부(11)와, 굴착부(11)의 상단에 결합되는 항타부(12)를 포함한다.As shown in Figure 1(b), the construction device 10 according to the present invention includes an excavation part 11 with a sharp end and an overall straight shape, and a driving part 12 coupled to the upper end of the excavation part 11. Includes.
굴착부(11)는 상기 접지봉(1)의 내경보다 미세하게 작은 외경을 가짐으로써 접지봉(1)의 내부로 쉽게 삽입될 수 있으면서도 접지봉(1)이 땅에 박힐 때 외부에서 오는 압력에 대항하여 접지봉(1)의 변형을 방지할 수 있도록 되어 있다.The excavation part 11 has an outer diameter that is slightly smaller than the inner diameter of the grounding rod 1, so that it can be easily inserted into the interior of the grounding rod 1, and when the grounding rod 1 is driven into the ground, it acts as a counter to the pressure coming from the outside. It is designed to prevent deformation of (1).
굴착부(11)는 접지봉(1)에 완전히 삽입되었을 때 단부의 뾰족한 부분이 접지봉(1)의 외측으로 돌출될 수 있는 길이를 가진다(도 1(c) 참조).When the excavation part 11 is fully inserted into the grounding rod 1, the pointed portion of the end has a length such that the pointed part of the end protrudes outward from the grounding rod 1 (see FIG. 1(c)).
굴착부(11)와 항타부(12)는 서로 나사 결합된다. 굴착부(11)의 상단에 수나사부가 형성되고, 항타부(12)의 하단에 암나사홀이 형성되어 서로 나사 체결된다.The excavation part 11 and the driving part 12 are screwed together. A male threaded part is formed at the top of the excavation part 11, and a female screw hole is formed at the bottom of the driving part 12 and are screwed together.
항타부(12) 역시 직선 원기둥 형상이며, 단 그 직경은 상기 접지봉(1)의 외경보다 미세하게 큰 정도(2~3mm)이다. 따라서 굴착부(11)의 외주에 접지봉(1)이 끼워졌을 때 접지봉(1)의 상단면 전체가 항타부(12)의 하단면에 접촉될 수 있으며, 이로써 시공장치(10)를 항타하여 굴착부(11)가 땅 속으로 박힐 때 항타부(12)가 접지봉(1)을 안정적으로 밀어주어 함께 땅 속으로 박혀 들어갈 수 있게 된다.The driving unit 12 also has a straight cylindrical shape, but its diameter is slightly larger (2 to 3 mm) than the outer diameter of the ground rod 1. Therefore, when the ground rod (1) is inserted into the outer periphery of the excavation unit (11), the entire upper surface of the ground rod (1) can be in contact with the lower surface of the driving unit (12), thereby driving the construction device (10) and excavating. When the part 11 is driven into the ground, the driving part 12 stably pushes the ground rod 1 so that it can be driven into the ground together.
상기 굴착부(11)와 항타부(12)는 브레이커 등의 항타장치에 의해 직접 타격되어 지면을 뚫고 들어가는 것이므로 고강도의 강재로 제작된다.The excavation part 11 and the driving part 12 are made of high-strength steel because they are directly struck by a driving device such as a breaker and penetrate the ground.
도 2(a)와 같이, 상기 접지봉(1)은 필요에 따라 다수개 연결하여 사용할 수 있다. 이를 위해 접지봉(1)의 상단에는 다른 접지봉(1)의 하단을 삽입할 수 있는 확관부(1a)가 형성된다. 도면에 확관부(1a)를 강조하여 도시하였으나 확관부(1a)는 내경이 접지봉(1)의 외경과 동일하면 되고 그 보다 더 클 필요는 없으며, 특히 외경의 확장은 가급적 작은 것이 지중 삽입에 유리하다.As shown in FIG. 2(a), multiple ground rods 1 can be connected and used as needed. For this purpose, an expansion portion 1a is formed at the top of the ground rod 1 into which the lower end of another ground rod 1 can be inserted. Although the expansion part (1a) is shown in the drawing with emphasis, the inner diameter of the expansion part (1a) needs to be the same as the outer diameter of the ground rod (1) and does not need to be larger than that. In particular, the expansion of the outer diameter as small as possible is advantageous for underground insertion. do.
이와 같이 복수의 접지봉(1)을 연결하여 사용할 때 제일 마지막에 사용되는 접지봉(1)에(최상부 접지봉)만 리드선(2)이 연결된다. 시공 현장에서 필요에 따라 최상부 접지봉(1)에 리드선(2)을 연결할 수 있으나, 리드선(2)이 구비된 접지봉(1)을 따로 준비해두면 보다 신속하고 용이하게 작업을 진행할 수 있음은 물론이다.When using a plurality of ground rods 1 by connecting them like this, the lead wire 2 is connected only to the last used ground rod 1 (the uppermost ground rod). At the construction site, the lead wire (2) can be connected to the top ground rod (1) as needed, but of course, if the ground rod (1) equipped with the lead wire (2) is separately prepared, the work can proceed more quickly and easily.
접지봉(1)의 길이 연장에 따라 시공장치(10)의 길이도 함께 연장되어야 한다. 도 2(b)와 같이, 시공장치(10)에서도 굴착부(11)를 다수개 연결하여 사용할 수 있다. 단 위에 설명한 바와 같이 직접 땅을 뚫고 들어가는 최하부 굴착부(11)는 하단이 뾰족하지만, 그 이후에 연결되는 굴착부(11′)는 하단에 암나사홀이 형성되고 상단에 수나사부가 형성된 구조로 이루어진다.As the length of the ground rod (1) is extended, the length of the construction device (10) must also be extended. As shown in Figure 2(b), the construction device 10 can also be used by connecting multiple excavation parts 11. However, as described above, the lowest excavation part 11, which directly penetrates the ground, has a sharp bottom, but the excavation part 11' connected afterwards has a structure in which a female screw hole is formed at the bottom and a male screw part is formed at the top.
따라서 하단부가 뾰족한 최하부 굴착부(11)의 상부에 필요한 만큼 연결용 (11′)를 연결한 후 가장 위쪽에 상기 항타부(12)를 연결하여 시공장치(10)를 구성할 수 있다.Therefore, the construction device 10 can be constructed by connecting the connecting portion 11′ as needed to the upper part of the lowest excavation portion 11, which has a sharp lower end, and then connecting the driving portion 12 to the uppermost portion.
이와 같이 길이가 연장된 접지봉(1)으로 굴착부(11,11′)를 삽입한 경우에도 최하부 굴착부(11)의 뾰족한 선단부는 최하부 접지봉(1)의 하단으로 돌출된다(도 2(c) 참조).Even when the excavation portions 11 and 11′ are inserted into the ground rod 1 whose length is extended in this way, the sharp tip of the lowest excavation portion 11 protrudes from the bottom of the lowest ground rod 1 (FIG. 2(c) reference).
도 3은 본 발명에 따른 접지봉(1)과 시공장치(10)를 이용하여 전주의 접지 시공을 하는 방식을 설명하는 도면이다. 도시된 바와 같이, 시공장치(10)의 굴착부(11)를 접지봉(1)에 삽입한 상태에서 시공장치(10)의 항타부(12)를 브레이커로 타격해주면, 시공장치(10)는 굴착부(11)를 선두로 하여 지중으로 박혀 들어가게 된다. 따라서 항타부(12)가 접지봉(1)의 후단을 밀어줌으로써 접지봉(1)이 굴착부(11)와 함께 지중으로 삽입된다. 접지봉(1)에 리드선(2)이 구비된 경우 리드선(2)도 접지봉(1)과 함께 땅속으로 삽입된다.Figure 3 is a diagram illustrating a method of grounding an electric pole using the grounding rod (1) and the construction device (10) according to the present invention. As shown, when the driving part 12 of the construction equipment 10 is struck with a breaker while the excavation part 11 of the construction equipment 10 is inserted into the ground rod 1, the construction equipment 10 is excavated. It is driven into the ground with part 11 at the head. Therefore, the driving unit 12 pushes the rear end of the grounding rod 1, so that the grounding rod 1 is inserted into the ground together with the excavation unit 11. When the ground rod (1) is equipped with a lead wire (2), the lead wire (2) is also inserted into the ground together with the ground rod (1).
상기와 같이 본 발명은 접지봉(1)이 직접 항타되어 땅을 파고 들어가는 것이 아니라, 시공장치(10)가 항타되면서 지중으로 삽입되고 접지봉(1)은 시공장치(10)의 굴착부(11)가 형성하는 경로를 통해 함께 따라 들어가는 것이다.As described above, in the present invention, the ground rod (1) is not directly driven and dug into the ground, but is inserted into the ground while the construction device (10) is driven, and the ground rod (1) is inserted into the ground by the excavation portion (11) of the construction device (10). It is to follow together through the path that is formed.
이와 같이 접지봉(1)이 브레이커의 항타 충격과 지중 삽입 저항을 직접 받지 않고, 접지봉(1)이 관형으로 형성되어 그 내부를 시공장치(10)의 굴착부(11)가 지지하고 있으므로 접지봉(1)의 변형이 방지된다.In this way, the ground rod (1) is not directly subjected to the driving impact of the breaker and the resistance to insertion into the ground, and the ground rod (1) is formed in a tubular shape, and the inside of the ground rod (1) is supported by the excavation part (11) of the construction device (10), so the ground rod (1) ) deformation is prevented.
따라서 접지봉(1)에 고강성이 요구되지 않기 때문에 접지봉(1)을 순수 동 재질로 제작할 수 있게 되어 접지봉(1) 자체의 저항이 감소되고, 또한 접지봉(1)을 보다 깊은 깊이에 매설할 수 있게 됨으로써 전주 접지저항 규정을 만족하기 용이하다.Therefore, since high rigidity is not required for the ground rod (1), the ground rod (1) can be manufactured from pure copper material, which reduces the resistance of the ground rod (1) itself and also allows the ground rod (1) to be buried at a deeper depth. This makes it easy to satisfy electric pole grounding resistance regulations.
또한 지중 삽입 중에 접지봉(1)의 표면이 흙, 돌 등에 긁혀 상처가 나는 경우에도 전체 재질이 동이기 때문에 산화로 인해 접지봉(1) 전체의 구조적 강성이나 접지 성능을 약화되는 현상이 발생하지 않게 된다. 따라서 접지봉(1)을 단기간 내 재시공해야 하는 문제를 방지할 수 있다.In addition, even if the surface of the ground rod (1) is scratched by dirt, stones, etc. during insertion into the ground, the structural rigidity or grounding performance of the entire ground rod (1) will not be weakened due to oxidation because the entire material is copper. . Therefore, the problem of having to reinstall the ground rod (1) within a short period of time can be prevented.
또한 상기와 같이 고강성 재질의 시공장치(10)가 직접 지중으로 항타 삽입되고, 이때 접지봉(1) 뿐만 아니라 접지봉(1)에 연결된 리드선(2)도 함께 지중으로 딸려 들어갈 수 있기 때문에 접지봉 매설을 위해 미리 전주 주변 땅을 굴착해 둘 필요가 없게 된다. 이로써 접지봉을 무굴착 방식으로 시공할 수 있다.In addition, as described above, the construction device 10 made of high-rigidity material is driven directly into the ground, and at this time, not only the ground rod 1 but also the lead wire 2 connected to the ground rod 1 can be driven into the ground, making it possible to bury the ground rod. There is no need to excavate the land around Jeonju in advance for this purpose. This allows the grounding rod to be constructed without digging.
도 3은 전주(20)에 인접하여 접지봉(1)을 수직 설치하는 시공예를 도시한 것이다. 이와 같이 시공장치(10)를 수직 하방으로 항타함으로써 접지봉(1)을 수직 하방으로 매설할 수 있다.Figure 3 shows a construction example of vertically installing the ground rod (1) adjacent to the electric pole (20). In this way, the ground rod 1 can be buried vertically downward by driving the construction device 10 vertically downward.
한편, 하나의 접지봉(1)만 일부 매설(접지봉 상단은 아직 지상에 있는 경우)하고 접지저항을 측정한 결과 측정치가 규정치에 근접한 경우에는 접지봉(1)에 리드선(2)을 연결한 후 계속 항타하거나 접지봉(1)을 리드선(2)이 구비된 접지봉(1)으로 교환하고 항타 작업을 진행할 수 있다. 이 경우 접지봉(1)을 규정 깊이(상단부 깊이가 0.75m 이상) 이상으로 더 박아 넣으면 접지저항 규정치를 만족할 수 있게 된다.On the other hand, if only one grounding rod (1) is partially buried (the top of the grounding rod is still on the ground) and the grounding resistance is measured and the measured value is close to the specified value, connect the lead wire (2) to the grounding rod (1) and continue driving. Alternatively, the grounding rod (1) can be replaced with a grounding rod (1) equipped with a lead wire (2) and the driving work can be performed. In this case, if the grounding rod (1) is driven further beyond the specified depth (top depth of 0.75m or more), the specified grounding resistance value can be satisfied.
반면, 하나의 접지봉(1)만 사용해서는 접지저항 규정치를 만족할 수 없을 경우에는 위에 설명한 방식대로 접지봉(1)과 굴착부(11, 11′)의 길이를 연장하면서 항타 작업을 진행할 수 있다.On the other hand, if the ground resistance standard value cannot be satisfied by using only one ground rod (1), driving work can be carried out by extending the length of the ground rod (1) and the excavation parts (11, 11′) as described above.
또한 별도로 도시하지 않았으나 1개소의 접지봉 매설로 접지저항 규정치를 만족할 수 없는 경우에는 먼저 설치된 접지봉으로부터 소정 거리 떨어진 위치에 또 다른 접지봉을 매설하고 이를 병렬로 연결함으로써 접지저항 규정치를 만족시킬 수 있다.In addition, although not separately shown, if the grounding resistance standard cannot be satisfied by burying a single grounding rod, the grounding resistance standard can be satisfied by burying another grounding rod at a predetermined distance away from the first installed grounding rod and connecting them in parallel.
한편, 도 3과 같이 접지봉을 전주(20)에 근접하여 수직으로 매설하기 곤란한 경우가 발생할 수 있다. 본 발명은 시공장치(10)를 이용하여 접지봉(1)을 매설하기 때문에 굳이 종래와 같이 접지봉을 수직 방향으로만 항타하지 않고 경사 방향으로 항타하여도 용이하게 지중으로 삽입할 수 있다.Meanwhile, as shown in FIG. 3, it may be difficult to vertically bury the grounding rod close to the electric pole 20. Since the present invention buries the grounding rod (1) using the construction device (10), the grounding rod (1) can be easily inserted into the ground by driving it in an oblique direction instead of driving it only in the vertical direction as in the prior art.
따라서 도 4와 같이 접지봉(1)을 경사 방향으로 항타하여 매설함으로써 지중 설비(예; 상/하수도관, 통신케이블)나 또는 돌덩어리 등 접지봉(1)의 진입을 방해하는 요소를 회피하여 접지봉(1)을 매설할 수 있다. 또한 이 경우 전주(20)에 대한 접지봉(1)의 이격 거리 규정을 준수하기도 용이하다.Therefore, as shown in FIG. 4, the grounding rod (1) is driven in an inclined direction and buried to avoid elements that impede the entry of the grounding rod (1), such as underground facilities (e.g. water/sewage pipes, communication cables) or stones. ) can be buried. Also, in this case, it is easy to comply with the separation distance regulations of the ground rod (1) with respect to the electric pole (20).
도 5는 본 발명에 따른 접지봉 시공방법의 순서도이다. 본 발명에 따른 접지봉 시공방법은 시공장치 결합단계(S10), 접지봉 부분삽입단계(S20), 접지저항 규정치 만족 판단단계(S30), 리드선 연결단계(S40), 접지봉 완전삽입단계(S50), 시공장치 분리단계(S60), 접지선 연결 및 보호구 설치단계(S70)를 포함한다.Figure 5 is a flow chart of the grounding rod construction method according to the present invention. The grounding rod construction method according to the present invention includes a construction device combining step (S10), a grounding rod partial insertion step (S20), a grounding resistance standard value satisfaction determination step (S30), a lead wire connection step (S40), a grounding rod complete insertion step (S50), and construction. It includes a device separation step (S60), a ground wire connection, and a protective equipment installation step (S70).
상기 접지봉과 시공장치 결합단계(S10)에서는 접지봉(1)에 시공장치(10)의 굴착부(11)를 삽입하여 시공장치(10)에 접지봉(1)을 결합한다.In the step of combining the ground rod and the construction device (S10), the excavation part 11 of the construction device 10 is inserted into the ground rod 1 to couple the ground rod 1 to the construction device 10.
상기 접지봉 부분삽입단계(S20)에서는 시공장치(10)의 항타부(12)를 브레이커로 항타하여 접지봉(1)을 지중에 일부 삽입한다. 즉, 접지봉(1)의 상단부가 지면 위쪽에 남아 있는 상태까지 접지봉(1)을 지중에 삽입한다.In the ground rod partial insertion step (S20), the driving unit 12 of the construction device 10 is driven with a breaker to partially insert the ground rod 1 into the ground. That is, the grounding rod (1) is inserted into the ground until the upper end of the grounding rod (1) remains above the ground.
상기 접지저항 규정치 만족 판단단계(S30)에서는 시공장치(10)를 분리하고 접지봉(10)에 접지선을 가연결한 후 접지저항을 측정하여 접지저항 규정치를 만족하는지 여부를 판단한다.In the step S30 of determining whether the ground resistance standard is satisfied, the construction device 10 is separated, a ground wire is temporarily connected to the ground rod 10, and the ground resistance is measured to determine whether the ground resistance standard is satisfied.
상기 리드선 연결단계(S40)에서는 상기 접지저항 규정치 만족 판단단계(S30)에서 접지저항이 규정치를 만족할 경우 접지봉(10)에 리드선(2)을 연결한다. 이때 접지봉(10)에 리드선(2) 대신 전주의 접지선을 바로 연결할 수도 있다. 이 경우 이하에서 설명할 접지선 연결 및 보호구 설치단계(S70)에서는 접지선이 이미 연결되어 있는 상태이므로 보호구만 설치한다.In the lead wire connection step (S40), if the ground resistance satisfies the specified value in the ground resistance requirement satisfaction determination step (S30), the lead wire (2) is connected to the ground rod (10). At this time, the ground wire of the electric pole may be directly connected to the ground rod (10) instead of the lead wire (2). In this case, in the ground wire connection and protective gear installation step (S70), which will be described below, the ground wire is already connected, so only the protective gear is installed.
상기 접지봉 완전삽입단계(S50)에서는 시공장치(10)의 항타부를 브레이커로 항타하여 리드선(2)(또는 접지선)이 연결된 접지봉(1)을 지중에 완전히 삽입한다.In the grounding rod complete insertion step (S50), the driving part of the construction device 10 is driven with a breaker to completely insert the grounding rod 1 to which the lead wire 2 (or grounding wire) is connected into the ground.
상기 시공장치 분리단계(S60)에서는 접지봉(10)에서 시공장치(10)를 분리하여 제거한다.In the construction device separation step (S60), the construction device 10 is separated from the ground rod 10 and removed.
상기 접지선 연결 및 보호구 설치단계(S70)에서는 지면 위로 돌출되어 있는 리드선(2)에 전주(20)의 접지선을 연결하고, 접지선을 가려주는 보호구를 전주(20)에 설치한다. 위에 설명한 바와 같이 상기 리드선 연결단계(S40)에서 리드선(2) 대신 전주(20)의 접지선을 접지봉(1)에 바로 연결한 경우에는 리드선 연결을 생략하고 보호구 설치 작업만 실시한다.In the grounding wire connection and protective equipment installation step (S70), the grounding wire of the electric pole 20 is connected to the lead wire 2 protruding above the ground, and protective equipment that covers the grounding wire is installed on the electric pole 20. As described above, if the ground wire of the electric pole 20 is directly connected to the ground rod 1 instead of the lead wire 2 in the lead wire connection step (S40), the lead wire connection is omitted and only the protective equipment installation work is performed.
상기와 같은 접지봉 시공방법에 따라 시공장치를 이용하여 접지 공사를 실시함으로써 무굴착 상태에서 접지봉을 용이하게 매설하고 전주(20)를 접지할 수 있게 된다.By performing grounding work using a construction device according to the grounding rod construction method described above, it is possible to easily bury the grounding rod and ground the electric pole 20 in a non-excavating state.
한편, 상기 접지저항 규정치 만족 판단단계(S30)에서 측정값이 접지저항 규정치를 만족하지 않으면 접지봉과 시공장치 길이 연장단계(S35)를 실시한다. 이 단계(S35)에서는 선 삽입된 접지봉(1)의 상단에 또 다른 접지봉(1)의 하단을 삽입하여 접지봉의 전체 길이를 연장한다. 이때 시공장치(10)도 마찬가지로 선단용 굴착부(11)와 항타부(12)의 사이에 연결용 굴착부(11′)를 설치하여 굴착부(11,11′)의 전체 길이를 연장한다.Meanwhile, if the measured value does not satisfy the ground resistance standard value in the ground resistance standard satisfaction determination step (S30), the grounding rod and construction device length extension step (S35) is performed. In this step (S35), the lower end of another ground rod (1) is inserted into the upper end of the previously inserted ground rod (1) to extend the entire length of the ground rod (1). At this time, the construction device 10 similarly installs a connection excavation part 11' between the tip excavation part 11 and the driving part 12 to extend the entire length of the excavation parts 11 and 11'.
이와 같이 접지봉(1)과 시공장치(10)의 길이를 연장한 후에는 상기 S10, S20, S30의 단계를 접지저항 측정치가 규정치를 만족할 때까지 반복 수행한다.After extending the length of the ground rod 1 and the construction device 10, the steps S10, S20, and S30 are repeated until the ground resistance measurement satisfies the specified value.
또한, 상기 시공장치 분리단계(S60) 이후에 접지저항저감제 주입단계(S65)를 더 실시할 수 있다. 접지저항저감제 주입단계(S65)에서는 분말 형태의 접지저항저감제를 적량의 물과 혼합하여 시공장치(10)를 제거한 홀 내부로 부어 넣는다. 접지저항저감제는 접지봉(1)의 내부 및 외주면과 토양의 사이, 시공장치(10)의 항타부(12)가 있던 공간에 충진되어 접지봉(1)과 대지 사이의 저항을 감소시켜 줌으로써 전주의 접지저항을 줄이는데 도움을 준다.In addition, the grounding resistance reducing agent injection step (S65) may be further performed after the installation device separation step (S60). In the grounding resistance reducing agent injection step (S65), the grounding resistance reducing agent in powder form is mixed with an appropriate amount of water and poured into the hole from which the construction device 10 was removed. The grounding resistance reducer is filled in the space between the inner and outer peripheral surfaces of the grounding rod (1) and the soil, and in the space where the driving part (12) of the construction device (10) was located, and reduces the resistance between the grounding rod (1) and the ground, thereby reducing the resistance of the grounding rod (1) and the ground. Helps reduce grounding resistance.
이상 설명한 바와 같이 본 발명에 따른 접지봉은 순수 구리 재질로 이루어져 부식이 적으므로 수명이 증진된다. 따라서 접지보강, 재시공에 따른 공사비용을 절감할 수 있게 된다.As described above, the grounding rod according to the present invention is made of pure copper material and has little corrosion, thereby improving its lifespan. Therefore, construction costs due to ground reinforcement and re-construction can be reduced.
또한 굴착공사 없이 접지봉 및 리드선(접지선)을 땅속으로 매설할 수 있기 때문에 안전성이 향상되고, 공사비용이 절감된다.Additionally, safety is improved and construction costs are reduced because grounding rods and lead wires can be buried underground without excavation work.
또한 접지봉을 시공하기 위한 시공장치가 고강성을 가지며, 접지봉의 내부에 삽입되어 접지봉의 변형을 방지하기 때문에 심타에 유리하여 접지봉을 보다 깊이 매설할 수 있다.In addition, the construction device for constructing the grounding rod has high rigidity and is inserted inside the grounding rod to prevent deformation of the grounding rod, which is advantageous for deep damage and allows the grounding rod to be buried more deeply.
또한 동일한 이유에 의해 경사 시공(사선 시공)이 가능함으로써 접지봉 매설시 지중 설비를 피하기 용이하고 전주로부터 규정 거리를 확보하기 용이하다.Also, for the same reason, slanted construction (diagonal construction) is possible, making it easy to avoid underground facilities when burying ground rods and to secure a specified distance from electric poles.
상술한 바와 같이 본 발명은 도면에 도시된 실시예를 참고로 하여 설명되었으나, 이는 예시적인 것에 불과하며, 당해 기술이 속하는 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다. 따라서 본 발명의 진정한 기술적 보호범위는 아래의 특허청구범위에 의해서 정하여져야 할 것이다.As described above, the present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and various modifications and other equivalent embodiments can be made by those skilled in the art. You will understand that it is possible. Therefore, the true technical protection scope of the present invention should be determined by the scope of the patent claims below.
1 : 접지봉 1a : 확관부
2 : 리드선 10 : 시공장치
11,11′: 굴착부 12 : 항타부
20 : 전주 G : 지면1: Ground rod 1a: Expansion part
2: Lead wire 10: Construction device
11,11′: Excavation section 12: Driving section
20: Jeonju G: Ground
Claims (9)
상기 시공장치의 항타부를 항타하여 접지봉을 지중에 일부 삽입하는 접지봉 부분삽입단계(S20);
상기 시공장치를 분리하고 접지봉에 접지선을 가연결한 후 접지저항을 측정하여 접지저항 규정치를 만족하는지 여부를 판단하는 접지저항 규정치 만족 판단단계(S30);
상기 접지저항 규정치 만족 판단단계(S30)에서 접지저항이 규정치를 만족할 경우 접지봉에 리드선을 연결하는 리드선 연결단계(S40);
상기 시공장치의 항타부를 항타하여 접지봉을 지중에 완전히 삽입하는 접지봉 완전삽입단계(S50);
상기 접지봉에서 시공장치를 분리하여 제거하는 시공장치 분리단계(S60);
상기 리드선의 지면 위쪽 단부에 전주의 접지선을 연결하고, 접지선을 가려주는 보호구를 전주에 설치하는 접지선 연결 및 보호구 설치단계(S70);
를 포함하는 전주용 접지봉의 시공방법.A ground rod and construction device coupling step (S10) of inserting the excavation part of the construction device into the ground rod and coupling the ground rod to the construction device;
A ground rod partial insertion step (S20) of partially inserting the ground rod into the ground by driving the driving unit of the construction device;
A grounding resistance standard satisfaction determination step (S30) in which the construction device is separated, a grounding wire is temporarily connected to a grounding rod, and then the grounding resistance is measured to determine whether the grounding resistance standard value is satisfied;
A lead wire connection step (S40) of connecting a lead wire to a ground rod if the ground resistance satisfies the standard value in the ground resistance regulation value satisfaction determination step (S30);
A grounding rod complete insertion step (S50) of completely inserting the grounding rod into the ground by driving the driving unit of the construction device;
A construction device separation step (S60) of separating and removing the construction device from the ground rod;
A grounding wire connection and protective equipment installation step (S70) of connecting the grounding wire of the electric pole to the end of the lead wire above the ground and installing protective equipment to cover the grounding wire on the electric pole;
Construction method of a grounding rod for an electric pole including.
상기 접지저항 규정치 만족 판단단계(S30)에서 측정값이 접지저항 규정치를 만족하지 않으면 선 삽입된 접지봉에 또 다른 접지봉을 연결하여 접지봉의 전체 길이를 연장하고, 상기 시공장치는 선단용 굴착부와 항타부의 사이에 연결용 굴착부를 설치하여 굴착부의 전체 길이를 연장하는 접지봉과 시공장치 길이 연장단계(S35)를 실시하는 것을 특징으로 하는 전주용 접지봉의 시공방법.In claim 7,
If the measured value does not satisfy the ground resistance regulation value in the grounding resistance regulation value satisfaction determination step (S30), another grounding rod is connected to the pre-inserted grounding rod to extend the total length of the grounding rod, and the construction device is installed with the tip excavator and driver. A method of constructing a grounding rod for an electric pole, characterized in that a grounding rod and a construction device length extension step (S35) are performed to extend the entire length of the excavation section by installing a connection excavation section between the sections.
상기 시공장치 분리단계(S60) 이후에 접지저항저감제를 물과 혼합하여 시공장치를 제거한 홀 내부로 부어 넣는 접지저항저감제 주입단계(S65)를 실시하는 것을 특징으로 하는 전주용 접지봉의 시공방법.
In claim 7,
A method of constructing a grounding rod for an electric pole, characterized in that, after the installation device separation step (S60), a grounding resistance reducing agent injection step (S65) is performed in which the grounding resistance reducing agent is mixed with water and poured into the hole from which the construction device was removed. .
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| KR200383498Y1 (en) | 2005-02-18 | 2005-05-03 | 박경운 | Protruding ground rod |
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