KR20100095070A - Method and apparatus for improving ground using cement grouting - Google Patents

Method and apparatus for improving ground using cement grouting Download PDF

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KR20100095070A
KR20100095070A KR1020090014177A KR20090014177A KR20100095070A KR 20100095070 A KR20100095070 A KR 20100095070A KR 1020090014177 A KR1020090014177 A KR 1020090014177A KR 20090014177 A KR20090014177 A KR 20090014177A KR 20100095070 A KR20100095070 A KR 20100095070A
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air
cutting water
cement
ground
cutting
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KR1020090014177A
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KR101095390B1 (en
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김정윤
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주식회사 엔티에스이앤씨
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/02—Placing by driving
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/02—Core bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Soil Sciences (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

PURPOSE: A method and an apparatus for improving ground using cement grouting are provided to improve the ground within a short time with simple equipment because the hardening degree and homogeneity of a hardened layer are increased. CONSTITUTION: A method for improving ground using cement grouting comprises following steps. A boring rod(10) with a drilling bit at a lower end bores the ground to be reinforced. The boring rod is rotated and extracted. High pressure air and cutting water are sprayed through an air and water spray nozzle(12) to cut and expand the bored underground space. A hardened layer is formed liquid cement which liquid cement is grouted through a cement injection nozzle.

Description

시멘트 그라우팅에 의한 지반 개량 강화 공법 및 장치{Method and apparatus for improving ground using cement grouting}Ground improvement strengthening method and apparatus by cement grouting {Method and apparatus for improving ground using cement grouting}

본 발명은 연약지반을 개량 강화하기 위해 천공로드로 지반을 뚫은 다음 천공로드를 인발하면서 에어 및 절삭수의 분사로 천공된 지중 공간을 확장하면서 그 공간에 시멘트를 분사하여 절삭된 토양과 함께 경화되게 하여 지반을 개량할 수 있게 한 지반 개량 공법 및 그 장치에 관한 것이다.The present invention is to be hardened with the soil cut by drilling cement into the space while drilling the ground with a punching rod to expand and strengthen the soft ground and then expand the ground ground space with the injection of air and cutting water while drawing the punching rod The present invention relates to a ground improvement method and a device for improving the ground.

기존의 지반 개량 공법에는 개량하여 강화하고자 하는 연약지반을 하측 단에 굴착비트가 형성된 천공로드를 이용하여 소정의 깊이로 구멍을 굴삭 천공한 다음, 천공로드를 빼내면서 회전과 동시에 상하로 승강시키면서 물분사노즐을 통해 고압의 물을 분사하여 주위지반을 절삭하여 걸쭉한 상태로 만든 후에 절삭로드를 빼내고, 액상의 시멘트고화제를 주입할 수 있는 주입공이 하측 단에 형성된 별도의 회전식 교반로드를 굴삭한 지반의 최하단까지 깊숙이 삽입하였다가 상측으로 끌어올리면서 시멘트고화제를 주입공을 통하여 주입하면 걸쭉한 절삭토와 시멘트고화제가 강제 교반되면서 다양한 형태의 개량강화된 콘크리트 경화층을 얻도록 하는 공법과,Existing ground improvement method is to excavate and drill the hole to a certain depth by using the drilling rod with the excavation bit formed at the lower end of the soft ground to be improved and strengthened. High pressure water is injected through the injection nozzle to cut the surrounding ground into a thick state, and then the cutting rod is pulled out, and the ground for excavating a separate rotary stirring rod formed at the lower end has an injection hole for injecting a liquid cement hardener. When the cement hardener is injected through the injection hole while being inserted deeply to the bottom of the bottom, the thick cutting soil and the cement hardener are forcibly stirred to obtain various types of improved hardened concrete layers.

삼중관에 의한 천공로드로 구멍을 굴삭 천공한 다음, 천공로드를 빼내면서 주위의 토사를 절삭하여 천공된 지중 공간을 확장하면서 지반 내부를 절삭하여 발생된 절삭토를 외부로 배토시켜 이에 포함된 불순물과 수분을 1,2차로 거르고 남은 모래(SAND) 성분을 재활용하여 시멘트고화제와 교반하여 단단히 반죽되게 배합형성한 몰탈을 삼중관을 통해 효율적으로 지반 내부로 다시 주입하므로 균등한 개량체의 조성에 의해 이것이 지중 공간내에서 경화되게 하여 개량 강화된 콘크리트 경화층을 얻는 공법이 있다.Excavate and drill a hole with a triple rod, and then remove the perforated rod, cut the surrounding soil, expand the perforated ground space, cut the ground, and dispose of the cutting soil generated to the outside to remove impurities. Filter the excess and moisture into the primary and secondary, and recycle the remaining sand (SAND) components and stir with the cement hardener to inject the mortar, which is formed to be firmly kneaded, through the triple pipe efficiently into the ground. Thereby, there is a method of allowing this to harden in the underground space to obtain an improved hardened concrete hardened layer.

기존의 지반 개량 공법 중, 전자의 경우는 비교적 간단한 시스템에 의해 저렴한 비용으로 콘크리트 경화층을 얻을 수 있으나 절삭수가 천공로드와 직각 방향으로 분사되므로 지반의 지질에 따라 그 분사압력이 미치는 범위가 다르게 되어 확장되는 공간의 크기가 불균일하여 이에 형성되는 시멘트와 절삭토에 의한 경화층 역시 불균일한 배합비와 불균일한 형태로 나타나는 문제점이 있다.Among the existing ground reforming methods, in the former case, a hardened concrete layer can be obtained at a low cost by a relatively simple system, but since the cutting water is sprayed in the direction perpendicular to the perforated rod, the range of the spray pressure varies depending on the geology of the ground. Since the size of the space to be expanded is nonuniform, the hardened layer formed by the cement and the cutting soil also has a problem of appearing in nonuniform mixing ratio and nonuniform form.

또 후자의 경우에는 콘크리트의 균일하고 견고한 경화도를 얻을 수는 있으나 배토되는 절삭토의 분리장치와 모래탱크 등의 추가장치를 필요로 하여 공사비 상승의 원인이 되는 문제가 있다.In addition, in the latter case, it is possible to obtain a uniform and solid degree of hardening of the concrete, but there is a problem that causes additional cost, such as the separation device of the cutting soil to be disposed and additional equipment such as sand tank.

본 발명은 기존의 지반 개량 공법 중 전기한 문제점을 제거코저 양자의 문제점을 고려하여 3중관을 이용한 천공로드에 의한 비교적 간단한 시스템으로 지반의 천공 및 인발과 지중공간의 확장과 경화층의 형성을 이루어지게 한 것으로, 천공로드의 인발과 동시에 지중 공간의 확장을 위해 천공로드의 에어 및 절삭수의 분사력에 의해 절삭되는 공간의 하측에 대하여 액상의 시멘트를 그라우트 되게 하여 절삭된 절삭토가 직접 콘크리트화 되게 하되, 에어 및 절삭수 분사노즐을 상하 일직선상에 분리 형성하여 그 상하 분사노즐의 분사방향을 같은 방향으로 대응되게 경사지게 조정하여 분사되는 절삭수가 일정한 위치에서 만나게 하여 그 거리에 의해 지중공간의 절삭범위를 조정되게 하여 경화층의 경화도와 균질성을 높게 함에 본 발명의 목적이 있다.The present invention is a relatively simple system by drilling rods using triple pipes in consideration of the problems of both of the existing ground improvement methods to achieve the drilling and drawing of the ground, the expansion of the ground space and the formation of a hardened layer In order to expand the ground space at the same time as the drawing of the drill rod, liquid cement is grouted to the lower side of the space cut by the injection force of air and cutting water of the drill rod so that the cut soil is directly concreted. However, the air and cutting water injection nozzles are formed on a straight line up and down to adjust the spray direction of the upper and lower injection nozzles to be inclined correspondingly in the same direction, so that the cutting water to meet at a predetermined position and the cutting range of the ground space by the distance The purpose of the present invention is to increase the degree of cure and homogeneity of the cured layer by adjusting .

전기한 목적을 이루기 위한 기술수단으로는 강화하고자 하는 연약지반을 하측단에 굴착비트가 형성된 천공로드를 이용하여 소정의 깊이로 구멍을 굴삭한 후, 천공로드를 빼내면서 천공로드의 측면에 형성된 절삭수 및 에어의 분사공으로 절삭수 및 에어를 분사하여 이에 의해 지중 공간을 확장하면서, 동시에 액상의 시멘트를 그라우팅하여 하측의 절삭토와 시멘트가 혼합되어 콘크리트화 되는 지반 개량 강화 공법에 있어서,As a technical means for achieving the above-mentioned purpose, the excavation hole is drilled to a predetermined depth by using a drilling rod having an excavation bit formed at the lower end of the soft ground to be strengthened, and the cutting formed on the side of the drilling rod while removing the drilling rod. In the ground improvement reinforcing method in which cutting water and air are injected into the water and air injection holes, thereby expanding the ground space, thereby grouting liquid cement and mixing the lower cutting soil and cement into concrete,

3중관으로 형성한 천공로드의 에어 및 절삭수 분사노즐을 상하 일직선상에 분리 형성하되 그 분사방향을 서로 대응되게 상하 경사 방향으로 형성하여 상하 분사노즐에서 분사되는 에어 및 절삭수가 소정거리에서 만나게 하여 절삭범위를 일정거리까지 한정하여 지중 확장공간을 균일하게 형성하여 그 내부에 조성되는 효과를 갖게 한 시공방법 및 그 장치를 제공한다.The air and cutting water injection nozzles of the drill rod formed by the triple pipe are formed on the up and down straight line, and the spraying directions are formed in the up and down inclination directions corresponding to each other so that the air and the cutting water injected from the up and down injection nozzles meet at a predetermined distance. Provided is a construction method and apparatus having an effect that is formed within the underground expansion space uniformly by limiting the cutting range to a certain distance to be formed therein.

본 발명은 3중관으로 형성된 천공로드의 측면에 형성된 에어 및 절삭수 분사노즐과 시멘트 분사노즐의 분사에 의해 천공된 지중 공간의 확장 및 경화층을 형성함에 있어서, 그 에어 및 절삭수 분사노즐을 일직선상의 상하로 분리 형성하여 서로 대응되는 같은 방향으로 분사시키므로서 절삭수가 만나는 지점까지 절삭 확장되게 하여 지중 확장공간의 반경을 일정하게 하여 그 내부에 조성되는 경화층의 경화도와 균질성을 높게 하여, 비교적 단순한 장비로도 단시간 내에 지반을 개량할 수 있는 효과가 있다.In the present invention, the air and the cutting water jetting nozzles are formed in a straight line in forming the expansion and hardening layer of the perforated ground space formed by the injection of the air and the cutting water jetting nozzles and the cement jetting nozzles formed on the side of the drill rod formed of the triple pipe. Separately formed in the upper and lower parts of the bed and sprayed in the same direction corresponding to each other, the cutting is extended to the point where the cutting water meets, the radius of the underground expansion space is constant, and the hardness and homogeneity of the cured layer formed therein is high, and relatively simple Equipment also has the effect of improving the ground in a short time.

이하, 본 발명의 실시예를 첨부 도면에 의하여 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with the accompanying drawings.

도 1은 본 발명의 지반 개량 공법의 시공순서 설명도이다.BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the construction sequence of the ground improvement method of this invention.

하측단부에 굴착비트(11)가 형성된 천공로드(10)를 굴삭장치(20)를 이용 강화코저 하는 지반의 소정 깊이까지 구멍을 굴삭하는 공정과,Digging a hole to a predetermined depth of the ground where the drilling rod 10 having the excavation bit 11 formed on the lower end is reinforced using the excavation device 20, and

천공로드(10)를 회전시켜가며 되뽑는 인발과 동시에 천공로드(10)의 주면에 형성된 에어 및 절삭수 분사노즐(12)과 시멘트 분사노즐(13)을 통해 초고압의 에어 및 절삭수의 분사에 의해 천공된 지중 공간을 절삭하여 확장하는 동시에 지중 공간내에 형성된 절삭토에 액상 시멘트를 그라우팅하여 절삭토와 액상 시멘트가 혼합되어 콘크리트화 시키므로서 그 경화에 의해 경화층(30)이 형성되는 지반의 확장 및 경화공정으로 되는 지반 강화 공법이다.At the same time as the punching rod 10 is rotated and pulled out, air and cutting water injection nozzles 12 and cement injection nozzles 13 formed on the main surface of the punching rod 10 are sprayed to the ultra high pressure air and cutting water injection. Expanding the ground on which the hardened layer 30 is formed by hardening by cutting and expanding the perforated underground space and grouting the liquid cement to the cutting soil formed in the underground space, thereby mixing the concrete with the cutting soil and the liquid cement. And a ground reinforcement method which is a hardening step.

도 2는 전기한 지반 강화 공법에 사용되는 본 발명의 3중관으로 된 천공로드에 대한 구성 설명도이다.Figure 2 is a configuration explanatory diagram of a three-hole drilling rod of the present invention used in the above ground reinforcement method.

시멘트통로(14), 에어통로(15), 절삭수통로(16)가 3중으로 형성된 3중관의 천공로드(10)의 하측 단부에는 굴착비트(11)가 형성되고, 천공로드(10)의 측면부에는 하부에 시멘트통로(14)와 연결된 시멘트 분사노즐(13)을 형성하고 그 상부에는 에어통로(15)와 절삭수통로(16)가 함께 연결된 에어 및 절삭수 분사노즐(12)이 형성된 천공로드에 있어서,An excavation bit 11 is formed at the lower end of the three-hole drill rod 10 having a cement passage 14, an air passage 15, and a cutting water passage 16 formed in three, and a side portion of the drill rod 10. The cement rod nozzle 13 connected to the cement passage 14 is formed in the lower portion thereof, and the air and cutting water spray nozzles 12 connected to the air passage 15 and the cutting water passage 16 are formed thereon. To

에어 및 절삭수 분사노즐(12)(12')을 상하 일직선상에서 상하로 분리 형성하되, 에어 및 절삭수 분사노즐(12)(12')의 분사방향을 서로 대응되는 같은 지점으로 경사지게 형성한 것이다.The air and cutting water injection nozzles 12 and 12 'are separated from each other in a vertical line, and the air and cutting water injection nozzles 12 and 12' are formed to be inclined at the same point corresponding to each other. .

도 3은 전기한 바와 같은 기존의 지반 개량 공법에 대하여 본 발명의 3중관으로 된 천공로드를 적용하여 지반내 천공구멍의 확장 및 강화 공법에 대한 설명도 이다.Figure 3 is an explanatory view of the expansion and reinforcement method of the drilling hole in the ground by applying the three-hole drilling rod of the present invention to the existing ground improvement method as described above.

굴삭공정과, 확장 및 강화공정을 전기한 도 1의 실시예와 같은 즉, 하측단부에 굴착비트(11)가 형성된 천공로드(10)를 굴삭장치(20)를 이용하여 강화코저 하는 지반의 소정 깊이까지 구멍을 굴삭하는 공정과,As shown in the embodiment of Fig. 1, which includes the excavation process and the expansion and reinforcement process, that is, the predetermined ground of the boring rod 10 having the excavation bit 11 formed at the lower end thereof by using the excavation device 20. To excavate holes to depth,

천공로드(10)를 회전시켜가며 되뽑는 인발과 동시에 천공로드(10)의 주면에 형성된 에어 및 절삭수를 분사노즐(12)을 통해 고압의 에어 및 절삭수의 초고압 분사에 의해 에어가 절삭수를 감싸고 함께 분사되므로 공기저항을 최소화시켜 절삭수의 분사압을 최대화 시킨 상태에서 천공된 지중 공간을 효율적으로 절삭하여 확장하는 동시에 시멘트 분사노즐(13)을 통해 액상 시멘트를 그라우팅하여 지중 공간내에 형성된 절삭토와 액상 시멘트를 혼합하여 콘크리트화 시키므로서 그 경화에 의해 경화층(30)이 형성되는 지반의 확장 및 경화공정으로 실시하되,At the same time as the punching rod 10 is rotated and pulled back, air and cutting water formed on the main surface of the punching rod 10 are injected through the injection nozzle 12, and the air is cut by the ultra high pressure spraying of the air and the cutting water. And sprayed together to minimize the air resistance to maximize the cutting pressure of the cutting water to efficiently cut and expand the perforated underground space, and the cutting formed in the underground space by grouting the liquid cement through the cement injection nozzle (13) While the concrete is mixed with soil and liquid cement, the hardening layer 30 is formed by hardening, and the ground is expanded and hardened.

천공로드(10)의 에어 및 절삭수 분사노즐(12)(12')을 상하 일직선상에서 상하로 분리형성하되 그 에어 및 절삭수의 분사 방향을 서로 대응되는 같은 지점으로 경사지게 형성하여 에어 및 절삭수의 분사시에 천공로드(10)로부터 상하부 에어 및 절삭수가 만나 일치되는 거리(d)까지만 정확하게 지중공간이 절삭되게 하므로서 그 절삭 확장거리가 지질의 종류에 관계 없이 일정하게 되므로서 그 확장공간 내에 그라우팅되는 시멘트의 양과 절삭토의 양이 상하간에 균일하므로 시멘트와 절삭토가 혼합 경화되면서 균질의 경화층이 형성되고 그 경회층의 형상 또한 일정하므로 경화층의 경화도와 균질성을 높게 한 것이다.The air and cutting water injection nozzles 12 and 12 'of the punching rod 10 are separated from the upper and lower straight lines up and down, and the air and cutting water spraying directions are formed to be inclined at the same point corresponding to each other. Grouting in the expansion space while cutting the ground distance is constant regardless of the type of lipid, so that the ground space is cut exactly from the punching rod 10 to the distance (d) where the upper and lower air and cutting water meet and match each other. Since the amount of cement and the amount of cutting soil are uniform between the upper and lower sides, as the cement and the cutting soil are mixed and cured, a homogeneous hardened layer is formed, and the shape of the hardened layer is also constant, thereby increasing the hardness and homogeneity of the hardened layer.

또한 그 분사 각도의 조절에 따라 상하 절삭수가 만나는 위치의 거리 조절이 가능하며 그 확장 공간의 반경을 조정할 수 도 있다.In addition, it is possible to adjust the distance of the position where the upper and lower cutting water meets by adjusting the injection angle, and the radius of the expansion space can be adjusted.

도 1은 본 발명의 지반 개량 공법의 시공 순서도1 is a construction flowchart of the ground improvement method of the present invention

도 2는 본 발명 3중관으로 된 천공로드의 단면설명도Figure 2 is a cross-sectional explanatory view of the perforated rod of the present invention triple tube

도 3은 본 발명 천공로드에 의한 지반내 지중확장 및 경화 공정 설명도3 is an explanatory diagram of the underground expansion and hardening process by the present invention punched rod

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

10 : 천공로드 11 : 굴착비트10: drilling rod 11: drilling bit

12 : 에어 및 절삭수 분사노즐 13 : 시멘트 분사노즐12: air and cutting water spray nozzle 13: cement spray nozzle

14 : 시멘트 통로 15 : 에어통로14: cement passage 15: air passage

16 : 절삭수통로 17 : 에어분사노즐16: cutting passage 17: air spray nozzle

20 : 굴삭장치 30 : 경화층20: Excavator 30: Hardened layer

Claims (3)

하측단부에 굴착비트(11)가 형성된 천공로드(10)를 굴삭장치(20)를 이용하여 강화코저 하는 지반의 소정 깊이까지 구멍을 굴삭하는 공정과,Digging a hole to a predetermined depth of the ground where the drilling rod 10 having the excavation bit 11 formed on the lower end is reinforced using the excavation device 20, 천공로드(10)를 회전시켜가며 되뽑는 인발과 동시에 천공로드(10)의 주면에 형성된 에어 및 절삭수를 분사노즐(12)을 통해 고압의 에어 및 절삭수의 초고압 분사에 의해 천공된 지중 공간을 절삭하여 확장하는 동시에 시멘트 분사노즐(13)을 통해 액상 시멘트를 그라우팅하여 지중 공간내에 형성된 절삭토와 액상 시멘트를 혼합하여 콘크리트화 시키므로서 그 경화에 의해 경화층(30)이 형성되는 지반의 확장 및 경화공정으로 되는 지반 개량 공법에 있어서,Underground space perforated by the ultra high pressure injection of air and cutting water through the injection nozzle 12 with air and cutting water formed on the main surface of the drilling rod 10 at the same time as the drilling rod 10 is rotated and pulled out again. And expand the ground where the hardened layer 30 is formed by hardening, while cutting and expanding the same, and grouting the liquid cement through the cement spray nozzle 13 to mix the concrete and the cutting soil formed in the underground space. And in the ground improvement method to be a curing step, 지중 공간 확장시에 천공로드(10)의 에어 및 절삭수 분사노즐(12)(12')을 상하 일직선상에서 상하로 분리형성하되 그 에어 및 절삭수의 분사 방향을 서로 대응되는 같은 지점으로 경사지게 형성하여 에어 및 절삭수의 분사시에 천공로드(10)로부터 상하부 에어 및 절삭수가 만나 일치되는 거리(d)까지만 정확하게 지중공간이 절삭되게 하여 확장공간의 상하 반경이 일정하게 함을 특징으로 하는 시멘트 그라우팅에 의한 지반 개량 강화 공법.When the ground space is expanded, the air and cutting water injection nozzles 12 and 12 'of the drilling rod 10 are separated and formed up and down in a vertical line, and the air and cutting water injection directions are inclined to the same point corresponding to each other. Cement grouting is characterized in that the underground space is precisely cut only by a distance (d) where the upper and lower air and cutting water meet and coincide with the upper and lower air and cutting water when the air and the cutting water are sprayed. Ground improvement reinforcement method by 제 1항에 있어서,The method of claim 1, 상하 에어 및 절삭수 분사노즐(12)(12')을 토질에 따라 각도 조절이 가능하 게 하여 그 경사각의 조정으로 분사되는 상하 절삭수가 만나는 위치의 거리 조정에 의하여 확장공간의 반경을 조정되게 함을 특징으로 하는 시멘트 그라우팅에 의한 지반 개량 강화 공법.The upper and lower air and cutting water injection nozzles 12 and 12 'can be adjusted according to the soil, and the radius of the expansion space is adjusted by adjusting the distance of the position where the upper and lower cutting water meet by adjusting the inclination angle. Ground improvement strengthening method by cement grouting characterized in that. 시멘트통로(14), 에어통로(15), 절삭수통로(16)가 3중으로 형성된 3중관의 천공로드(10)의 하측 단부에는 굴착비트(11)가 형성되고, 천공로드(10)의 측면부에는 하부에 시멘트통로(14)와 연결된 시멘트 분사노즐(13)을 형성하고 그 상부에는 에어통로(15)와 절삭수통로(16)가 함께 연결된 에어 및 절삭수 분사노즐(12)이 형성된 천공로드에 있어서,An excavation bit 11 is formed at the lower end of the three-hole drill rod 10 having a cement passage 14, an air passage 15, and a cutting water passage 16 formed in three, and a side portion of the drill rod 10. The cement rod nozzle 13 connected to the cement passage 14 is formed in the lower portion thereof, and the air and cutting water spray nozzles 12 connected to the air passage 15 and the cutting water passage 16 are formed thereon. To 에어 및 절삭수 분사노즐(12)(12')을 상하 일직선상에서 상하로 분리 형성하되, 에어 및 절삭수 분사노즐(12)(12')의 분사 방향을 서로 대응되는 같은 지점으로 경사지게 형성함을 특징으로 하는 시멘트 그라우팅에 의한 지반 개량 강화 장치The air and cutting water injection nozzles 12 and 12 'are separated from the top and bottom in a straight line, and the air and cutting water injection nozzles 12 and 12' are formed to be inclined at the same point corresponding to each other. Ground improvement reinforcement device by cement grouting
KR1020090014177A 2009-02-20 2009-02-20 Method and apparatus for improving ground using cement grouting KR101095390B1 (en)

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KR20230078130A (en) * 2021-11-26 2023-06-02 임호균 Eco friendly method and apparatus for ground reinforceing of middle high pressure cross injection type
KR102647114B1 (en) 2023-02-02 2024-03-14 중앙지오텍 주식회사 Jet grouting equipment with ground cutting function
KR102637505B1 (en) 2023-06-27 2024-02-16 중앙지오텍 주식회사 Jet grouting equipment with improved ground cutting function

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