KR200183063Y1 - Grouting packer - Google Patents

Grouting packer Download PDF

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Publication number
KR200183063Y1
KR200183063Y1 KR2019960039119U KR19960039119U KR200183063Y1 KR 200183063 Y1 KR200183063 Y1 KR 200183063Y1 KR 2019960039119 U KR2019960039119 U KR 2019960039119U KR 19960039119 U KR19960039119 U KR 19960039119U KR 200183063 Y1 KR200183063 Y1 KR 200183063Y1
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South Korea
Prior art keywords
injection
ball
pipe
outer diameter
spring
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KR2019960039119U
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Korean (ko)
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KR19980026256U (en
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주형식
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주형식
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203Arrangements for filling cracks or cavities in building constructions
    • E04G23/0211Arrangements for filling cracks or cavities in building constructions using injection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00Check valves
    • F16K15/02Check valves with guided rigid valve members
    • F16K15/04Check valves with guided rigid valve members shaped as balls
    • F16K15/044Check valves with guided rigid valve members shaped as balls spring-loaded

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

본 고안은 건축물이나 구축물의 콘크리이트에 생긴 크랙홀에 합성수지액을 주입시켜 붕괴를 방지하기 위한 것으로서, 수지액을 공급 받는 수액관(10)과 크랙홀에 깊이 박아 넣는 주사체(20)의 외주면에 다수의 돌출륜(23)을 형성한 구성과 외경나사관(30)으로 상하연결 한 다음 상기 외경나사관(30)의 하단 내경에 볼(40)과 스프링(41)을 내장시켜 상기 외경나사관(30)의 중공부(31)틀 개폐하도록 하고, 외경나사관(30)의 하안 외경에 노즐(50)을 연결시켜 크랙홀에 수지액을 강제 주입시킨 후 상기의 수액관(10)을 절단하여도 강제주입된 수지액이 상기 스프링(41)에 탄지된 볼(40)의 차단으로 외부로 노출되지 않게 되는 작용효과를 나타내는 그라우팅 패커이다.The present invention is to prevent the collapse by injecting the synthetic resin solution into the crack hole formed in the concrete of the building or construction, the outer peripheral surface of the fluid pipe 10 receiving the resin liquid and the injection body 20 deeply embedded in the crack hole The upper and lower connections to the configuration and the outer diameter screw pipe 30 and the configuration formed a plurality of protruding ring 23 in the ball inner diameter of the lower diameter of the outer thread pipe 30 to the built-in ball 40 and the spring 41 Open and close the hollow part 31 of the threaded pipe 30, connect the nozzle 50 to the lower diameter of the lower eye of the external threaded pipe 30, and forcibly inject the resin solution into the crack hole. It is a grouting packer which shows the effect of not being exposed to the outside by the blocking of the ball 40 supported by the spring 41 even if the cutting force is injected.

Description

그라우팅 패커Grouting Packer

제1도는 본 고안의 분해사시도.1 is an exploded perspective view of the present invention.

제2도는 제1도의 조립 종단면도.2 is an assembly longitudinal cross-sectional view of FIG.

제3도는 종래고안 종단면도.3 is a conventional draft longitudinal cross-sectional view.

제4도는 또다른 종래 고안의 종단면도.4 is a longitudinal sectional view of another conventional design.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 수액관 20 : 주사체10: infusion tube 20: injection

30 : 외경나사관 40 : 볼30: external thread 40: ball

41 : 스프링 50 : 노즐41: spring 50: nozzle

본 고안은 그라우팅패커의 개량에 관한 것으로,The present invention relates to an improvement of the grouting packer,

특히, 건축물이나 구축물의 콘크리이트 벽에 생긴 크랙홀내에 에폭시나 폴리우레탄과 같은 합성수지액을 강제 주입시켜 갈라진 콘크리트벽의 크랙홀이 더 이상 벌어지지 못하도록 접착성의 에폭시나 합성수지액으로 갈라진 벽을 서로 잡아주도록 하므로서 콘크리이트벽의 붕괴됨을 방지하는 그라우팅 패커(Grouting Packer)에 관한 것이다.In particular, by injecting synthetic resin such as epoxy or polyurethane into the crack hole formed on the concrete wall of the building or construction, the cracked walls of the cracked concrete wall are held together by adhesive epoxy or synthetic resin to prevent cracking. A grouting packer is provided that prevents the collapse of concrete walls.

종래 일반적인 그라우팅 패커는 제3도에 표현된 바와같이 수지액을 공급받는 수액관(100)과 수지액을 크랙홀에 주입하기 위하여 크랙홀에 강제삽착시키는 금속성 주사체(200)를 상하 연결하여 사용하게 되는 것으로 상기 수액관(100)에는 수지액이 지나는 입액로(101)와 이 입액로(101)와 연통되는 암나사공(102)이 굴설되어 있고,Conventionally, the conventional grouting packer is used by connecting the fluid injection tube 100 receiving the resin liquid and the metallic injection member 200 forcibly inserted into the crack hole to inject the resin liquid into the crack hole as shown in FIG. In the fluid pipe 100, the fluid passage 101 through which the resin liquid passes and the female screw hole 102 communicating with the fluid passage 101 are excavated.

금속성의 주사체(200)는 하단을 크랙홀에 강제 삽착이 용이하도록 콘형으로 테이퍼면(201)을 형성하였으며, 상단에는 나사봉(202)을 형성시켜 나사봉(202)과 테이퍼면(201)의 하단까지 주사로(203)를 형성시켜 상기 나사봉(202)을 입액로(101) 하단부터 형성된 암나사공(102)에 나사끼움하여 수액관(100) 하단에 주사체(200)를 연결하는데 이 연결과정에서 나사봉(202)의 상단으로부터 암나사공(102)에 볼밸브(300)와 스프링(301)을 순차적으로 장설하여 스프링(301)의 탄성으로 볼밸브(300)가 입액로(101)를 밀폐시키는 상태로 구성하여서 된 것으로서,The metallic injection target 200 has a tapered surface 201 formed in a cone shape to facilitate forced insertion of a lower end into a crack hole, and a threaded rod 202 formed at an upper end thereof so that the screw rod 202 and the tapered surface 201 are formed. Forming the injection path 203 to the lower end of the screw rod 202 is screwed into the female threaded hole 102 formed from the lower end of the mouth fluid 101 to connect the injection body 200 to the lower end of the infusion tube 100 In this connection process, the ball valve 300 and the spring 301 are sequentially installed in the female threaded hole 102 from the upper end of the screw rod 202 so that the ball valve 300 enters the inlet path 101 by the elasticity of the spring 301. ) In a sealed state,

상기 주사체(200)를 크랙홀에 강제 삽착한후 수액관(100)에 수지액을 공급하면 공급되는 수지액은 입액로(101) 하단측의 볼 밸브(300)를 밀어 내면서 주사로(203)를 통하여 크랙홀에 강제 주입하게 되며, 상기와 같이 주입과정이 끝나면 콘크리이트벽 외면에 길게 돌출된 수액관(100)을 절단하여 마무리작업을 하게 되는 것이다.After forcibly inserting the injection body 200 into the crack hole and supplying the resin liquid to the infusion tube 100, the supplied resin liquid pushes the ball valve 300 at the lower end of the liquid inlet passage 101 to the injection passage 203. Forced injection into the crack hole through the), and after the injection process as described above is to finish the cutting operation by cutting the infusion tube 100 protruding long on the outer surface of the concrete wall.

그러나 제3도에서 보는 바와같이 큰크리트벽 외면에 길게 돌출된 수액관(100)을 절단하면 볼밸브(300)와 스프링(301)이 주사체(200)에 대하여 밸브작용을 할 수 없게 파괴되어 크랙홀에 약 50kg/cm2의 압력으로 주입된 합성 수지액이 주사체(200)의 주사로(203)를 통하여 그 압력이 미치는 량만큼 외부로 누출되는 관계로 통상 합성수지액이 굳어 있는 시점에 상기의 수액관(100)을 절단하는데, 이럴 경우 합성수지액이 굳는 기간이 적어도 하루 또는 이틀정도의 시일은 걸리므로 주입작업후 수액관(100)을 절단하기 위하여는 작업이 끝난 후에 다시 하루나 이틀후에 같은 장소에 와서 수액관을 절단하여야 하는 작업상의 번거로움과 문제점이 있는 것이다.However, as shown in FIG. 3, when the infusion tube 100 protruding long on the outer surface of the large concrete wall is cut, the ball valve 300 and the spring 301 are destroyed so that the valve 200 cannot act on the injection body 200. Since the synthetic resin solution injected into the crack hole at a pressure of about 50 kg / cm 2 leaks to the outside through the injection path 203 of the injection body 200 by the amount of the pressure, the synthetic resin solution is usually solidified In order to cut the infusion tube 100, in this case it takes a period of at least one day or two days to solidify the synthetic resin solution, in order to cut the infusion tube 100 after the injection work after one or two days after the end of the work again Come to the same place and have to work the troublesome and trouble to cut the infusion tube.

그리고, 제4도로 도시된 선출원 공개된 공개실용신안공보 제1116호 공개번호 96-17820호의 『콘크리트 구조물의 균열보수 시공용 패커』는 그 기술적 구성요부가 “주입파이프(106)에 와샤(122)와 고무슬리브(102)를 삽입 후 장나선부(14)에 고정너트(116)를 나사결합하는 것에 있어서, 주입파이프(106) 선단에 절단홈(111)을 가진 니플주입구(113)와 조임너트(112)를 일체로 하며, 주입로(110) 내후단에는 체크볼(107)과 스프링(108)을 매입 마킹작업한 주입파이프(106) 후단에서 나사조임으로 접속함을 특징으로 한 콘크리트 구조물의 균열보수 시공용 패커.In addition, the "Application Packer for Crack Repair Construction of Concrete Structures" of No. 1116 Publication No. 96-17820, which is disclosed in the fourth application of the first application, has a technical component of "Washer 122 in the injection pipe 106." And the nipple inlet 113 and the tightening nut having the cutting groove 111 at the distal end of the injection pipe 106 in screwing the fixing nut 116 to the long spiral portion 14 after the rubber sleeve 102 is inserted. (112) integrally, and the inner and rear ends of the injection passage 110, the check ball 107 and the spring 108 is connected to the back end of the injection pipe 106, which is a buried marking work by screwing the concrete structure Cracker repairing packer.

제1항에 있어서, 주입파이프(105)의 주입부분을 내측에 나선을 가진 조임너트(127)와 일체로 형성하여서된 콘크리트 구조물의 균열보수 시공용 패커”로 기재되어 있고 고무슬리브의 압착을 목적으로 패커의 후단에서 너트를 조여주어 고무슬리브가 팽창되어 지도록하여 수지충진제를 주입할 수 있게 한 것이나 고무슬리브를 너트로 조여 팽창되게하는 기술을 현재에도 일반적으로 사용되어 지고 있는 일반적인 기술인 것입니다.The method according to claim 1, wherein the injection portion of the injection pipe 105 is formed as a packer for repairing cracks in concrete structures formed by integrally forming a fastening nut 127 with a spiral inside thereof. As a result, it is possible to inject the resin filler by tightening the nut at the rear end of the packer to inflate the rubber sleeve or to expand the rubber sleeve by tightening the rubber sleeve with the nut.

이와같은 고안의 개량에도 불구하고 제4도에 도시된 고안은 주사체의 니플주입구를 절단하기 위하여는 제3도에 기재된 종래의 기술상의 문제점과 같이 주입작업후 수액관을 절단하기 위하여 작업이 끝난후에도 합성수지액이 굳는 기간으로 적어도 하루이상 이틀정도후에는 재차 시공현장을 다시방문하여 니플주입구를 절단하여야 하는 문제점이 그대로 남아 있었다.Despite the improvement of the design, the design shown in FIG. 4 is finished to cut the infusion tube after the injection operation, as in the conventional technical problem described in FIG. 3 to cut the nipple inlet of the injection. Even after the synthetic resin solution solidified at least one or two days later, the problem of having to revisit the construction site again and cut the nipple inlet.

또한, 선출원공개된 공개실용신안공보 제1035호 공개번호 96-1943호의 “1회용 에폭시 주입관”이 있으며 그 기술적 구성요지는 「분사노즐(부호 1)은 5개의 분사구를 형성하여 분사효율을 높임으로 콘크리트 내부에 에폭시 주입제의 침투 능력을 활발하게 하며 고무호스(부호 2)는 표면에 9개의 굴절선을 두어 에폭시 주입제 유출과 압력에 의한 주입원의 유동을 방지할 수 있도록 구성됨을 특징으로 하는 1회용 에폭시 주입편」이 있으나 그 구조가 복잡하여 사용에 많은 불편이 있어 실용적이지 못하였다.In addition, there is a “disposable epoxy injection tube” of Published Utility Model Publication No. 1035 Publication No. 96-1943. The technical composition of the `` Injection Nozzle (No. 1) forms five injection holes to increase the injection efficiency. It enables the penetration of epoxy injection into concrete and the rubber hose (symbol 2) has 9 refractive lines on the surface to prevent the injection of epoxy injection and flow of injection source by pressure. Disposable epoxy injection piece, but the structure is complicated, so many inconveniences in use was not practical.

본 고안은 합성수지액을 크랙홀에 주입한 후 곧 바로 수액관을 절단하여도 합성수지액이 누출되지 않는 그라우팅 패커를 제공하는데 그 목적이 있는 것이다.The object of the present invention is to provide a grouting packer that does not leak synthetic resin liquid even after cutting the fluid tube immediately after injecting the synthetic resin liquid into the crack hole.

상기 본 고안에 맞추어 기재된 목적을 제공하는 그라우팅 패커는 수 액관과 주사체를 연결하는 외경나사관과 상기 외경나사관의 하단내경에 장설하는 볼 밸브와 상기 외경나사관의 하단 외경에 연결하는 노즐은 포함하여서 되는 것으로서, 이하 본 고안의 실시예를 나타내 보인 도면에 따라 상세히 설명한다.The grouting packer serving the purpose described in accordance with the present invention is an outer diameter screw pipe connecting the fluid tube and the injection and the ball valve installed in the lower inner diameter of the outer thread pipe and the nozzle connected to the lower outer diameter of the outer thread pipe As will be included, will be described in detail according to the drawings showing an embodiment of the present invention.

제1도는 본 고안의 분해 사시도이며, 제2도는 제1도의 조립종단면도로서, 이를 참조하면 부호 10은 중공체로 된 수액관을 표시한 것이며, 이 수액관(10)은 외경중간에 절단용 환요홈(11)과, 중공부인 1/2정도의 상부를 입액로(12)로 하여 이 입액로(12)하단부터 직경이 좀더 큰 암나사관(13)으로 하여 된 것이고 부호 20은 역시 중공체인 주사체를 나타낸 것으로,FIG. 1 is an exploded perspective view of the present invention, and FIG. 2 is a longitudinal cross-sectional view of the assembly of FIG. 1. Referring to this, reference numeral 10 denotes an infusion tube made of a hollow body, and the infusion tube 10 is an outer tube for cutting in the middle of the outer diameter. The groove 11 and the upper half of the hollow part are formed as the mouth passage 12, and the female thread pipe 13 having a larger diameter from the bottom of the mouth passage 12 is used. It shows the body,

외주면에는 콘크리트와의 밀착성을 좋게하여 잘 빠지지 않토록 다수개의 돌출륜(23)을 등간격으로 구비하고 이 주사체(20)는 그 중공부 전체를 상기의 암나사관(13)과 같은 직경과 피치로 되는 연결나사관(21)으로 하여 또 역시 중공체로 되는 외경나사관(30)의 상단을 상기의 수액관(17)의 암나사관(13)에 나사끼움하고 외경나사관(30)외 외경에는 외주면에 다수개의 돌출륜(23)이 구비된 주사체(20)를 패킹(22)을 이용하여 그 이음부가 밀폐되 도록 외경나사관(30)에 나사끼움하여 연결하며,The outer circumferential surface is provided with a plurality of protruding wheels 23 at equal intervals so as to improve adhesion with concrete so that they do not fall out well. This injection body 20 has the same diameter and pitch as the entire female hollow tube 13 with the hollow part. The upper end of the outer diameter screw tube (30), which is also a hollow body, is connected to the female screw tube (13) of the infusion tube (17), and the outer diameter screw tube (30) has an outer diameter. The injection body 20 having a plurality of protruding rings 23 on the outer circumferential surface thereof is screwed to the outer diameter screw tube 30 so that the joint thereof is sealed by using the packing 22,

상기 주사체(20)하단에 노출된 외경나사관(30)의 하단측 내경에 수액관(10)절단시 수지액이 역류하는 것을 방지할 수 있는 기능을 수행하는 볼(40)과 스프링(41)을 내장한 상태로 하여 노즐(50)을 노출된 외경나사관(30)의 하단에 나사연결시켜 볼(40)이 스프링(41)의 탄성에 따라 외경나사관(30)의 중공부(31)틀 항상 차단하고 있어 주입된 수지액의 역류를 억제하고 콘크리트와 주사체(20)의 사이는 돌출륜(23)등에 의해 주사체와 갈라진 콘크리트벽 사이를 긴밀히 밀착되므로 외부와의 차단이 완전하게 이루어지도록 구성하여서 되는 것이다.The ball 40 and the spring 41 which perform a function of preventing the resin liquid from flowing backward when the infusion tube 10 is cut in the inner diameter of the lower end side of the outer diameter screw tube 30 exposed at the lower end of the injection body 20. ) And the nozzle 50 is screwed to the lower end of the exposed outer diameter threaded tube 30 with the ball 40 in the hollow portion 31 of the outer diameter threaded tube 30 according to the elasticity of the spring 41. Since the frame is always blocked, the reverse flow of the injected resin liquid is suppressed, and the concrete and the injection body 20 are closely contacted between the injection object and the cracked concrete wall by the protruding wheel 23, etc. It is to be configured to work.

이상과 같이 된 본 고안은 크랙홀에 주사체(20) 깊숙히 박아 넣고 수액관(10)의 상단부에 합성수지액을 큰 압력으로 공급하는 공급관을 연결시 켜 합성수지액을 주입하면 입액로(12)와 중공부(31)로 입액되고, 볼(40)이 입액압력에 의하여 밀리면서 차단되었던 중공부(31)가 열려 크랙홀로 수지액이 주입되는 것이며,The present invention as described above is embedded in the crack hole deeply injecting the injection body 20 and connected to the supply pipe for supplying the synthetic resin solution at a large pressure to the upper end of the infusion tube 10 to inject the synthetic resin solution 12 and The liquid is injected into the hollow part 31, and the resin part is injected into the crack hole by opening the hollow part 31 which was blocked while the ball 40 was pushed by the liquid pressure.

주입작업이 완료되면 그 압력으로 주입된 수지액이 노즐(50)로 역류되나 이때에는 수지액의 압력과 스프링(41)의 탄성에 의하여 볼(40)이 중공부(31)축으로 밀려 차단하게 되므로 수지액이 외부로 누출되지 않게 되는 것이고, 주입작업이 끝남과 동시에 환요홈(11)에 따라 수액관(10)을 절단하여 작업을 완료하는 것이다.When the injection operation is completed, the resin liquid injected at the pressure flows back to the nozzle 50, but at this time, the ball 40 is pushed to the hollow part 31 shaft and blocked by the pressure of the resin liquid and the elasticity of the spring 41. Therefore, the resin solution is not leaked to the outside, and at the same time as the end of the injection work is to cut the infusion tube 10 according to the groove groove 11 to complete the work.

상기와 같은 본 고안은 볼(40)과 스프링(41)을 노즐(50)측 외경나사관(30)의 하단내경에 장설시켜 주입된 수액지의 역류를 방지한 것이므로 주입작업이 끝남과 동시에 환요홈(11)을 따라 수액관(10)을 절단하게 된 것이어서 절단이 용이하고 종래 제3도이나 제4도의 것과 같이 주입한후 며칠 뒤에 뒷처리를 하기 위하여 작업장을 다시 찾아야 하는 번거로움이 제거된 효과가 있는 것이다.The present invention as described above is to prevent the reverse flow of the injected sap paper by installing the ball 40 and the spring 41 in the lower inner diameter of the outer diameter screw pipe 30 side of the nozzle 50, the end of the injection operation and at the same time groove groove It is easy to cut the infusion tube 10 along the (11) is easy to cut the effect of removing the hassle of having to visit the workplace again after a few days after the injection as in the conventional 3 or 4 There is.

Claims (1)

절단환요홈(11)을 갖는 수액관(10)의 나사부에 나합되는 외경나사관(30)에 주사체(20)를 외삽시키고 외경나사관선단과 노즐(50)로 조립한 패커의 구성과, 상기 주사체의 외주면에는 갈라진 콘크리트벽과의 밀착성을 높혀주는 세줄의 돌출륜(23)이 주사체의 몸체에 띠형으로 일체로 형성되는 구성과, 상기 주사체에 삽입되어 하단으로 연장되는 외경나사관(30)의 내경에는 주입된 수지액의 역류를 억제하는 기능의 볼(40) 및 스프링(41)을 공지형의 노즐(50)로 씌워준 구성의 결합으로 이루어짐을 특징으로 한 그라우팅 패커.A configuration of a packer which extrapolates the injection body 20 to an outer diameter screw tube 30 which is screwed to the threaded portion of the infusion tube 10 having a cutting ring recess 11, and assembles the outer diameter screw tube tip and the nozzle 50; On the outer circumferential surface of the injection body is formed a three-row protrusion wheel 23 is integrally formed in a belt-like body to the body of the injection to increase the adhesion to the cracked concrete wall, the outer diameter screw tube is inserted into the injection to extend to the bottom The grouting packer, characterized in that the inner diameter of (30) consists of a combination of the configuration of covering the ball 40 and the spring 41 of the function to suppress the back flow of the injected resin liquid with a known nozzle (50).
KR2019960039119U 1996-11-08 1996-11-08 Grouting packer KR200183063Y1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101222151B1 (en) 2012-09-05 2013-01-14 (주)바우테크 Packer adjustable of injection direction and repairing method of subsidence road using it
KR20200055332A (en) * 2018-11-13 2020-05-21 권구찬 Packer for repairing crack of concrete structure
KR102352354B1 (en) 2021-08-06 2022-01-19 서창석 Packer assembly for crack repair
KR20230121279A (en) 2022-02-11 2023-08-18 남재호 Manufacturing method of inlet pipe for grouting packer

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Publication number Priority date Publication date Assignee Title
KR102116853B1 (en) * 2018-06-20 2020-06-10 수형산업개발 유한회사 Packer
KR102143338B1 (en) * 2018-06-20 2020-08-11 수형산업개발 유한회사 Packer
KR102116847B1 (en) * 2018-06-20 2020-06-10 수형산업개발 유한회사 Packer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101222151B1 (en) 2012-09-05 2013-01-14 (주)바우테크 Packer adjustable of injection direction and repairing method of subsidence road using it
KR20200055332A (en) * 2018-11-13 2020-05-21 권구찬 Packer for repairing crack of concrete structure
KR102231327B1 (en) * 2018-11-13 2021-03-24 권구찬 Packer for repairing crack of concrete structure
KR102352354B1 (en) 2021-08-06 2022-01-19 서창석 Packer assembly for crack repair
KR20230121279A (en) 2022-02-11 2023-08-18 남재호 Manufacturing method of inlet pipe for grouting packer

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