KR100241472B1 - A device for closing the working hole of sewer pipe - Google Patents
A device for closing the working hole of sewer pipe Download PDFInfo
- Publication number
- KR100241472B1 KR100241472B1 KR1019980010906A KR19980010906A KR100241472B1 KR 100241472 B1 KR100241472 B1 KR 100241472B1 KR 1019980010906 A KR1019980010906 A KR 1019980010906A KR 19980010906 A KR19980010906 A KR 19980010906A KR 100241472 B1 KR100241472 B1 KR 100241472B1
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- KR
- South Korea
- Prior art keywords
- work
- buried pipe
- working passage
- working
- plate
- Prior art date
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
- E03F2003/065—Refurbishing of sewer pipes, e.g. by coating, lining
Abstract
본발명은 매설관 내부에서 작업을 수행하기 위해 매설관의 일정위치에 작업통로구를 뚫어서 작업이 완료된 후에 다시 작업통로구를 밀실하게 밀폐시키는 매설관 내부보수용 작업통로구의 폐쇄장치에 관한 것으로, 작업통로구(11) 내측면 주변둘레를 따라 지지가능하도록 상기 작업통로구(11)의 크기보다 약간 크게 형성되어 관본체(10) 내면에 밀실하게 접합되는 내부판(20)과, 상기 내부판(20)과 대향되게 작업통로구(11) 외측면 주변둘레에 지지가능하게 접합되도록 상기 작업통로구(11)의 크기보다 약간 크게 형성되어 관본체(10) 외면에 접합되는 외부판(30)과, 상기 작업통로구(11)를 사이에 두고 관본체(10)의 내외부면에 접합되는 내,외부판(20)(30)들을 상호 긴밀하게 연결하여 조여주는 조임수단(40)으로 구성되는 것이다.The present invention relates to a closure device for the internal maintenance work passage for the buried pipe to drill the working passage hole at a predetermined position of the buried pipe to perform the work inside the buried pipe, and tightly closes the working passage hole again after the work is completed. The inner plate 20 is formed slightly larger than the size of the working passage hole 11 so as to be supported along the inner circumference of the working passage hole 11, and is tightly bonded to the inner surface of the tube body 10, and the inner plate. The outer plate 30 which is formed slightly larger than the size of the working passage opening 11 so as to be supported on the outer periphery of the working passage opening 11 so as to face the outer side of the working passage opening 11, is joined to the outer surface of the tube main body 10. And tightening means 40 for tightly connecting the inner and outer plates 20 and 30 joined to the inner and outer surfaces of the tube body 10 with the work passageway 11 interposed therebetween. will be.
Description
본발명은 매설관 내부에서 작업을 수행하기 위해 매설관의 일정위치에 작업통로구를 뚫어서 작업이 완료된 후에 다시 작업통로구를 밀실하게 밀폐시키는 매설관 내부보수용 작업통로구의 폐쇄장치에 관한 것이다.The present invention relates to a closing device of the work passageway for internal maintenance of the buried pipe to tightly seal the work passageway again after the work is completed by drilling the working passageway in a certain position of the buried pipe to perform the work inside the buried pipe.
일반적으로 도로 인접지역에 매설된 매설관의 자체에 결함이 생겨서 누수가 발생될 경우 도로를 굴착하여 매설관의 외부에서 보수작업을 하게 되는 것이 통례이다. 이러한 매설관의 외부에서 보수작업을 하는 통상적인 방법은 굴착으로 인하여 부등침하의 우려가 있어 보수후 재누수가 발생될 수 있으며, 인접부에 추가로 결함이 발생될 수 있으며, 외부공사로 인한 관변동 대처성이 약하며, 특히 도로를 굴착하게 됨으로서 교통체증을 가중시키면서 도로의 재포장 등으로 보수공사가 길어지는 등의 여러 가지 문제점을 초래하게 된다.In general, when a leak occurs due to a defect in a buried pipe itself buried in an adjacent area of a road, it is common to excavate a road and perform repair work outside the buried pipe. Conventional methods of repair work outside such buried pipes may cause uneven settlement due to excavation, which may cause re-leakage after repairing, and additional defects may occur in adjacent areas. It is weak to cope with fluctuations, and in particular, the excavation of roads causes various problems such as lengthening traffic congestion and long renovation work due to resurfacing of roads.
그러나, 매설관의 외부에서가 아니라 내부에서 보수작업을 하게 될 경우에는 도로를 굴착하지 아니하고 보수작업을 할 수 있게 된다. 매설관의 내부에 들어가서 보수작업을 하게 될 경우, 차량이 통행하지 않는 일정위치에 땅을 굴착한 후 매설관에 작업통로구를 뚫어줄 필요가 있다. 따라서 작업자들이 작업통로구를 통하여 매설관의 내부에 들어가서 결함위치를 찾아서 그 결함부위를 보수하고 난 후에 다시 작업통로구를 수밀하게 폐쇄시켜 주는 것이 필요하게 된다.However, if the repair work is to be carried out in the interior, not outside the buried pipe can be repaired without excavating the road. In case of repair work by going inside the buried pipe, it is necessary to excavate the ground at a certain position where the vehicle does not pass and then drill the work passage through the buried pipe. Therefore, it is necessary for the workers to enter the interior of the buried pipe through the work passage, find the defect position, repair the defect, and close the work passage tightly again.
따라서, 본발명의 목적은 매설관 내부에서 작업을 수행하기 위해 매설관의 일정위치에 작업통로구를 뚫어서 작업이 완료된 후에 다시 작업통로구를 간편하면서도 밀실하게 폐쇄시켜 주는 매설관 내부보수용 작업통로구의 폐쇄장치를 제공하는 데 있다.Therefore, the purpose of the present invention is to drill the work passage hole at a certain position of the buried pipe to carry out the work inside the buried pipe, and after the work is completed, the work passage for maintenance of the buried pipe internally to close and close the working channel easily and tightly. To provide a closure device for the sphere.
도1은 매설관에 뚫려진 작업통로구를 나타내는 예시도1 is an exemplary view showing a working passage hole drilled in a buried pipe
도2는 본발명의 폐쇄장치를 나타내는 사시도Figure 2 is a perspective view showing a closing device of the present invention
도3a는 본발명의 폐쇄장치가 매설관에 설치된 상태를 나타내는 단면도Figure 3a is a sectional view showing a state in which the closure device of the present invention is installed in the buried pipe
도3b는 본발명의 폐쇄장치가 매설관에 설치된 다른 실시예를 나타내는 단면도Figure 3b is a cross-sectional view showing another embodiment in which the closure device of the present invention is installed in the buried pipe
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10:관본체,매설관 11:작업통로구10: Main body, buried building 11: Work passage
20:내부판 30:외부판20: inner plate 30: outer plate
40:조임수단 41:볼트40: Fastening means 41: Bolt
42:너트 50:고무패킹42: Nut 50: Rubber packing
60:충전물체60: filling object
이하, 본발명의 기술적 구성을 설명하면 다음과 같다.Hereinafter, the technical configuration of the present invention will be described.
본발명의 매설관 내부보수용 작업통로구의 폐쇄장치는 작업통로구(11) 내측면 주변둘레를 따라 지지가능하도록 상기 작업통로구(11)의 크기보다 약간 크게 형성되어 관본체(10) 내면에 밀실하게 접합되는 내부판(20)과, 상기 내부판(20)과 대향되게 작업통로구(11) 외측면 주변둘레에 지지가능하게 접합되도록 상기 작업통로구(11)의 크기보다 약간 크게 형성되어 관본체(10) 외면에 접합되는 외부판(30)과, 상기 작업통로구(11)를 사이에 두고 관본체(10)의 내외부면에 접합되는 내,외부판(20)(30)들을 상호 긴밀하게 연결하여 조여주는 조임수단(40)으로 구성되어, 기설치된 관의 내부에서 누수방지 작업을 수행하기 위하여 임시로 뚫은 작업통로구(11)를 밀실하게 폐쇄시켜 줌을 특징으로 하는 것이다.The closure device of the buried pipe internal repair work passage of the present invention is formed slightly larger than the size of the work passage 11 so as to be supported along the inner circumference of the work passage 11 so that the inner surface of the pipe main body 10 can be supported. It is formed to be slightly larger than the size of the working passage port 11 so as to support the inner plate 20 to be tightly bonded to the outer periphery of the working passage port 11 facing the inner plate 20 so as to be supported. The outer plate 30 bonded to the outer surface of the tube body 10 and the inner and outer plates 20 and 30 bonded to the inner and outer surfaces of the tube body 10 with the work passage 11 therebetween. It is composed of a tightening means 40 for tightly connecting and tightly closing the work passage hole 11 temporarily drilled in order to perform the leakage prevention work in the interior of the pre-installed pipe.
이와 같이 구성되는 본발명은 내부판(20)이 작업통로구(11)가 형성된 매설관의 내측면에 부착되고, 외부판(30)은 작업통로구(11)가 형성된 매설관의 바깥면에 부착되며, 상기 내,외부판을 조임수단(40)으로 긴밀하게 조여서 관본체(10)에 밀실하게 접합되게 함으로써 작업통로구(11)를 간편하면서도 밀실하게 폐쇄시켜 주는 것이다.According to the present invention configured as described above, the inner plate 20 is attached to the inner surface of the buried pipe in which the work passage opening 11 is formed, and the outer plate 30 is attached to the outer surface of the buried pipe in which the working passage opening is formed. It is attached, by tightly tightening the inner and outer plates with the fastening means 40 to be tightly bonded to the tube main body 10 to simply and tightly close the working passage opening (11).
이하, 첨부도면들에 도시되는 대표적인 실시예를 통하여 본발명을 보다 구체적으로 살펴보면 다음과 같다.Hereinafter, the present invention will be described in more detail with reference to exemplary embodiments shown in the accompanying drawings.
본발명의 실시예도, 도1 내지 도3b에서 도시되는 바와 같이, 작업통로구(11) 내측면 주변둘레를 따라 지지가능하도록 상기 작업통로구(11)의 크기보다 약간 크게 형성되어 관본체(10) 내면에 밀실하게 접합되는 내부판(20)과, 상기 내부판(20)과 대향되게 작업통로구(11) 외측면 주변둘레에 지지가능하게 접합되도록 상기 작업통로구(11)의 크기보다 약간 크게 형성되어 관본체(10) 외면에 접합되는 외부판(30)과, 상기 작업통로구(11)를 사이에 두고 관본체(10)의 내외부면에 접합되는 내,외부판(20)(30)들을 상호 긴밀하게 연결하여 조여주는 조임수단(40)들을 그 구성요소들로 가진다는 점에서 본발명의 기본적인 기술사상을 구현하는 것이다.1 to 3B, the embodiment of the present invention is formed to be slightly larger than the size of the working passage opening 11 so as to be supported along the inner circumference of the working passage opening 11 so that the tube body 10 The inner plate 20 is tightly bonded to the inner surface, and slightly larger than the size of the working passage hole 11 so as to be supported to be joined to the outer circumference of the outer surface of the work passage 11 so as to face the inner plate 20. An outer plate 30 that is formed to be large and bonded to the outer surface of the tube body 10, and an inner and outer plate 20 and 30 bonded to the inner and outer surfaces of the tube body 10 with the work passage 11 therebetween. ) Is to implement the basic technical idea of the present invention in that it has the tightening means (40) to the components that tightly connect to each other.
상기 내부판(20)은 플라스틱, 콘크리트 , 금속 등으로 만들어질 수 있다. 도3a에서 도시되는 바와 같이, 작업통로구(11)를 통하여 관본체 내부에 들어가서 내부판(20)의 테두리와 관본체(10)의 내측면, 즉 작업통로구(11) 주변에 서로 맞닿는다.The inner plate 20 may be made of plastic, concrete, metal, or the like. As shown in Figure 3a, through the working passageway 11 enters the inside of the tube body and abuts the edge of the inner plate 20 and the inner surface of the tube body 10, that is around the working passageway (11) .
또한, 내부판(20)은 관본체(10)의 곡률과 동일한 곡률을 가지는 것이 바람직하다. 이는 서로 맞닿는 부분이 밀실하게 접합되는데 좋다.In addition, the inner plate 20 preferably has the same curvature as that of the tube body 10. This is good for the parts in contact with each other tightly bonded.
상기 외부판(30)은 내부판과 마찬가지로 플라스틱, 콘크리트, 금속 등으로 만들어질 수 있다. 도3a에서 도시되는 바와 같이, 외부판(30)의 테두리가 작업통로구(11)의 주변 외측면에 맞닿는다. 외부판(30)도 관본체의 곡률에 따라 동일한 곡률로 만들어지는 것이 바람직하다.Like the inner plate, the outer plate 30 may be made of plastic, concrete, metal, or the like. As shown in FIG. 3A, the edge of the outer plate 30 abuts against the peripheral outer surface of the work passage opening 11. The outer plate 30 is also preferably made of the same curvature according to the curvature of the tube body.
그러나, 외부판(30)은 내부판(20)과는 달리 관본체(10) 밀실하게 접착되지 아니하여도 된다. 따라서, 외부판(30)은 도2에서 도시된 바와 같이, 하나의 판상으로 제작될 수도 있지만, 격자모양으의 틀체로 제작되어서 관본체의 외측면에 지지되어서 조임수단(40)에 의해서 내부판(20)을 관본체(10)에 지지시킬 수도 있다.However, unlike the inner plate 20, the outer plate 30 may not be tightly bonded to the tube body 10. Therefore, the outer plate 30 may be manufactured in a single plate shape, as shown in FIG. It is also possible to support the tube body 10.
상기 조임수단(40)은 내부판(20)과 외부판(30)을 각각 관본체의 작업통로구(11) 주변에 긴밀하게 부착되도록 조여주는 역할을 하는 것이다. 도2, 도3a에서 도시되는 바와 같이, 머리부는 내부판(20)에 부착되고 나사부는 외부판(30) 상부에서 너트(42)로 조여지는 볼트(41)와 너트(42)로 이루어짐을 예시해 보여준다.The tightening means 40 serves to tighten the inner plate 20 and the outer plate 30 so as to be tightly attached to the periphery of the work passage 11 of the tube body, respectively. As shown in Figs. 2 and 3A, the head is attached to the inner plate 20 and the threaded portion is composed of a bolt 41 and a nut 42 tightened by a nut 42 on the outer plate 30. Show it.
조임수단(40)은 내부판(20)에 도2에서와 같이, 용접으로 부착될 수도 있고, 도3a,b와 같이, 너트로 부착될 수도 있으나, 외부판(30)에는 도2에서와 같이, 소정위치에 뚫려지는 통공을 통하여 관통되어 너트(42)로 고정된다.The tightening means 40 may be attached to the inner plate 20 by welding, as shown in FIG. 2, or may be attached by a nut as shown in FIGS. 3a and b, but the outer plate 30 may be attached as shown in FIG. 2. , Is penetrated through the through-hole that is drilled at a predetermined position and is fixed with the nut 42.
한편, 도3a 및 도3b에서 도시되는 바와 같이, 상기 내,외부판(20)(30)과 관본체(10)간에 고무패킹(50)을 삽입하여 수밀하게 접합하는 것이 바람직하다.On the other hand, as shown in Figures 3a and 3b, it is preferable to insert the rubber packing 50 between the inner and outer plates 20, 30 and the tube body 10 to be watertightly bonded.
또한, 도3b에서 도시되는 바와 같이, 수밀성을 증대 시키기 위하여 내부판(20)과 외부판(30) 사이에 형성되는 공간부에 수밀성 충전물체(60)를 충전할 수도 있음을 밝혀둔다. 충전물체(60)를 충전하기 위해서는 상부판(30)에 충전물체를 주입할 수 있는 주입구멍과 공기가 빠져나올 수 있는 공기구멍이 필요하다. 따라서 주입구멍에 깔대기를 대고 충전물체를 충전할 수 있다. 그리고 공간부 내부에 충전물체가 완전하게 충전되도록 공기구멍에는 파이프를 수직하게 꽂아 놓고 충전하는 것이 바람직하다.In addition, as shown in Figure 3b, it is to be noted that the watertight packing material 60 may be filled in the space formed between the inner plate 20 and the outer plate 30 to increase the water tightness. In order to fill the filling material 60, an injection hole for injecting the filling material into the upper plate 30 and an air hole for allowing air to escape are required. Therefore, the filling material can be filled with a funnel in the injection hole. In addition, it is preferable to insert the pipe vertically into the air hole so that the filling material is completely filled in the space part.
상기한 수밀성 충전물체(60)는 와레실몰탈을 충전하게 된다. 즉, 와레실 : 일반회색시멘트 : 물의 비율을 2:1:1로 배합하여 2-3차례 정도 도포하여 완료하게 된다. 이러한 와레실몰탈은 콘크리트, 플라스틱 또는 금속 등에 부착력이 좋을 뿐만 아니라 탄성이 있고 강도가 뛰어나서 방수재질로 적격이다.The watertight filler 60 is filled with waresyl mortar. That is, the waresyl: general gray cement: water ratio of 2: 1: 1 is mixed to 2-3 times to complete. Such waresyl mortar is not only good adhesion to concrete, plastic or metal, but also has elasticity and excellent strength, so it is suitable as a waterproof material.
한편, 상기 작업통로구(11)는 도1 및 도2에서와 같이, 내부판(20)이 작업통로구(11)를 통하여 매설관(10) 내부로 원활히 들어갈 수 있도록 긴 장공 또는 사각형으로 뚫려지는 것이 필요하다. 따라서 내부판(20)을 작업통로구(11)의 대각선 방향으로 기울어서 쉽게 넣을 수 있게 된다. 이러한 작업통로구(11)가 매설관(10)에 뚫려지는 위치는 관(10)의 상부에 길이방향으로 뚫어주는 것이 좋다. 이는 통로구가 상부에 뚫어짐으로 굴착 및 되메우기가 간편하며, 또한 길이방향으로 뚫어짐으로서 토사의 하중압력에 대응하는 응력이 커지므로 최대한 관의 변형을 방지할 수 있기 때문이다.On the other hand, the working passage hole 11, as shown in Figures 1 and 2, the inner plate 20 is drilled in a long hole or a square so that smoothly enters into the buried pipe 10 through the working passage hole (11) It is necessary to lose. Therefore, the inner plate 20 can be easily inclined in the diagonal direction of the work passage opening 11. The position where the work passage opening 11 is drilled in the buried pipe 10 may be drilled in the longitudinal direction on the upper part of the pipe 10. This is because excavation and backfilling are easy because the passage hole is drilled in the upper part, and the stress corresponding to the load pressure of the soil is increased by being drilled in the longitudinal direction, thereby preventing the deformation of the pipe as much as possible.
이와 같이 본발명은 매설관(10)의 상부에 뚫은 작업통로구(11) 내,외주변에 내부판(20) 및 외부판(30)을 맞대고 조임수단(40)으로 상호 긴밀하게 조여서 관본체(10)에 밀실하게 접합되게 함으로써 작업통로구(11)를 간편하면서도 밀실하게 폐쇄시켜 주는 효과가 있다.In this way, the present invention, the inner plate 20 and the outer plate 30 against the inner and outer periphery of the working passage opening 11 drilled on the upper portion of the buried pipe 10 and tightly tightened with each other by the fastening means 40. By tightly bonding to (10), there is an effect of closing the working passage port 11 simply and tightly.
이상에서 살펴본 바와 같이 본발명의 매설관 내부보수용 작업통로구의 폐쇄장치는 내부판이 매설관의 내측면에 부착되고 외부판은 매설관의 바깥면에 부착되게 조임수단으로 긴밀하게 조여줌으로써 작업통로구를 간편하면서도 밀실하게 밀폐시켜 주는 매우 유용한 것이다.As described above, the closure device of the buried pipe internal repair work passage according to the present invention has an inner plate attached to the inner surface of the buried pipe and the outer plate tightly tightened by a fastening means so as to be attached to the outer surface of the buried pipe. It is very useful to keep it simple and tightly sealed.
Claims (3)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950013087A KR100188547B1 (en) | 1995-05-24 | 1995-05-24 | Method for repairing the inside of pipe |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950013087A Division KR100188547B1 (en) | 1995-05-24 | 1995-05-24 | Method for repairing the inside of pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR19990076189A KR19990076189A (en) | 1999-10-15 |
| KR100241472B1 true KR100241472B1 (en) | 2000-02-01 |
Family
ID=19415291
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950013087A KR100188547B1 (en) | 1995-05-24 | 1995-05-24 | Method for repairing the inside of pipe |
| KR1019980010905A KR100241473B1 (en) | 1995-05-24 | 1998-03-28 | A fixing band for repairing a sewer pipe at the inside thereof |
| KR1019980010906A KR100241472B1 (en) | 1995-05-24 | 1998-03-28 | A device for closing the working hole of sewer pipe |
| KR1019980010904A KR0167436B1 (en) | 1995-05-24 | 1998-03-28 | Packing ring for repairing pipe |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950013087A KR100188547B1 (en) | 1995-05-24 | 1995-05-24 | Method for repairing the inside of pipe |
| KR1019980010905A KR100241473B1 (en) | 1995-05-24 | 1998-03-28 | A fixing band for repairing a sewer pipe at the inside thereof |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019980010904A KR0167436B1 (en) | 1995-05-24 | 1998-03-28 | Packing ring for repairing pipe |
Country Status (1)
| Country | Link |
|---|---|
| KR (4) | KR100188547B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100734227B1 (en) * | 2004-09-03 | 2007-07-02 | 박경숙 | Resin reinforcement method for joint of menhole and the joint structure using the same |
| KR101085163B1 (en) * | 2008-02-14 | 2011-11-18 | 배석동 | Water Tighten Panel for Through Hole of Sewage Gathering Duct |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100419384B1 (en) * | 2000-12-23 | 2004-03-04 | 씨엠엔지니어링(주) | Repair and reinforcement device for drainage pipe |
| KR100888858B1 (en) * | 2002-06-29 | 2009-03-17 | 주식회사 케이티 | Propulsion pipe |
| KR100934194B1 (en) * | 2009-02-19 | 2009-12-29 | 덕원산업개발주식회사 | Epoxy liner tube repairing apparatus and method using vacuum pressure |
| KR101251430B1 (en) * | 2011-02-14 | 2013-04-05 | 주식회사 케이디교역 | Pipe Line Repairing And Reinforcement Device, And Sewage Pipe Repairing Method And Defect Inspection Method Using The Same |
-
1995
- 1995-05-24 KR KR1019950013087A patent/KR100188547B1/en not_active IP Right Cessation
-
1998
- 1998-03-28 KR KR1019980010905A patent/KR100241473B1/en not_active IP Right Cessation
- 1998-03-28 KR KR1019980010906A patent/KR100241472B1/en not_active IP Right Cessation
- 1998-03-28 KR KR1019980010904A patent/KR0167436B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100734227B1 (en) * | 2004-09-03 | 2007-07-02 | 박경숙 | Resin reinforcement method for joint of menhole and the joint structure using the same |
| KR101085163B1 (en) * | 2008-02-14 | 2011-11-18 | 배석동 | Water Tighten Panel for Through Hole of Sewage Gathering Duct |
Also Published As
| Publication number | Publication date |
|---|---|
| KR19990076188A (en) | 1999-10-15 |
| KR100188547B1 (en) | 1999-06-01 |
| KR0167436B1 (en) | 1999-10-15 |
| KR19990076189A (en) | 1999-10-15 |
| KR100241473B1 (en) | 2000-02-01 |
| KR960041573A (en) | 1996-12-19 |
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