KR20010095442A - Method for Reinforcing Poor Ground - Google Patents

Method for Reinforcing Poor Ground Download PDF

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Publication number
KR20010095442A
KR20010095442A KR1020000016472A KR20000016472A KR20010095442A KR 20010095442 A KR20010095442 A KR 20010095442A KR 1020000016472 A KR1020000016472 A KR 1020000016472A KR 20000016472 A KR20000016472 A KR 20000016472A KR 20010095442 A KR20010095442 A KR 20010095442A
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South Korea
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ground
pipe
hardener
injection pipe
hole
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KR1020000016472A
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Korean (ko)
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KR100379076B1 (en
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박영숙
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박영숙
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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
    • E02D2250/00—Production methods
    • E02D2250/003—Injection of material

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

PURPOSE: A soft foundation hardening method is provided to remove causes of pollution caused by the discharge of muddy water containing a great deal of clay and a hardening agent and to form effective underground consolidator easily. CONSTITUTION: A soft foundation hardening method which hardens a soft foundation by forming a column-shaped consolidator on the ground soil by impregnating a ground hardener into the ground soil comprises the steps of: inserting an outer impregnation pipe(5) composed of a sack(4) and a perforated pipe and an inner impregnation pipe(6) provided with a perforated pipe into a hole bored through the ground soil; and injecting a hardener(7) mixed with substandard aggregate elements through the inner impregnation pipe(6) under high pressure, so that the hardener(7) is spouted radially to the circumference of the outer impregnation pipe(5) through each through hole of the inner impregnation pipe(5) and the outer impregnation pipe(6) and extended at the state of being confined in the sack(4) arranged to surround the outer impregnation pipe(5) to widen the hole of the ground soil and to form a cylindrical consolidator of a large diameter.

Description

연약지반 강화방법 {Method for Reinforcing Poor Ground}How to Strengthen Soft Ground {Method for Reinforcing Poor Ground}

본 발명은 연약지반 개량방법에 관한 것으로, 특히 지반에 천공된 구멍 내로 경화재를 지반토와 섞이지 않도록 주입함과 더불어 경화재의 중력 및 주입압력에 의해 늘어날 수 있도록 된 포대를 삽입하여 경화재의 주입량 및 형상을 제어할 수 있도록 된 연약지반 강화방법에 관한 것이다.The present invention relates to a method for improving soft ground, and in particular, injecting the hardened material into the bored hole in the ground so as not to mix with the ground soil and inserting an bag which can be increased by gravity and injection pressure of the hardened material, and the amount and shape of the hardened material is injected. It relates to a method for strengthening the soft ground that can be controlled.

종래에도 연약지반을 개량하거나 강화하기 위한 여러가지 방법이 제안되어 있는바, 그들 대부분은 지반에다 직경이 크지 않은 구멍을 뚫고서 거기에다 물과 경화재, 또는 공기와 물 및 경화재를 고압으로 주입하는 방법을 택하고 있다, 즉, 주입되어 노즐을 통해 분출되는 고압수에 의해 지반토에 뚫어놓은 구멍주변의 점토성분이 제거되도록 한 후, 점토성분이 제거된 상태의 지반토의 골재성분에 역시 주입되어 노즐을 통해 분출되는 경화재액이 혼합되도록 함으로써, 지중에 기둥형상 고결체가 형성되어 연약지반을 개량하도록 하고 있다. 요컨대 종래의 연약지반 개량방법은 지반개량재로 대부분 액상물을 사용하면서 고결체의 골재성분으로는 지반토 자체의 모래나 자갈을 이용하도록 되어 있다.Conventionally, various methods for improving or reinforcing soft ground have been proposed. Most of them choose a method of drilling a small diameter hole in the ground and injecting water and hardener or air and water and hardener at high pressure. That is, after the clay component around the hole drilled in the ground soil is removed by the high pressure water injected and ejected through the nozzle, the clay component is also injected into the aggregate component of the ground soil in which the clay component is removed, and then through the nozzle. By allowing the cured liquid to be ejected to mix, a columnar solidified body is formed in the ground to improve the soft ground. In short, the conventional method for improving the soft ground is to use sand or gravel of the ground soil itself as the aggregate component of the solidified body while most of the liquid material is used as the ground improving material.

그러나, 상기와 같이 액상의 경화재를 고압으로 주입하는 연약지반 개량방법에서는, 고압수 등으로 지반토의 점토성분을 굴삭한 다음 이를 지상으로 밀어올림과 동시에 고압수의 주입과 동시적으로 주입되는 액상의 경화재를 모래나 자갈과 혼합시켜 기둥형태의 고결체를 지중에 형성하도록 하고 있기 때문에, 지상으로 미려오라오는 막대한 양의 점토성 흙탕물의 처리가 큰 문제로 되고 있을 뿐만 아니라, 특히 점토성분의 배출과 경화재의주입이 동시적으로 행해지기 때문에 필연적으로 상기 지상으로 배출되는 흙탕물에 예컨대 경화재로서의 시멘트액 같은 것이 다량 혼합될 수 밖에 없어 공해방지라는 측면에서도 문제가 없지 않았다.However, in the soft ground improvement method of injecting a liquid hardener at high pressure as described above, the clay component of the ground soil is excavated with high pressure water and then pushed to the ground and simultaneously injected with high pressure water. Because the hardening material is mixed with sand or gravel to form columnar solid bodies in the ground, the treatment of enormous amounts of clay mud coming up to the ground becomes a big problem, and in particular, Since the injection of the hardening material is performed at the same time, there is no problem in terms of pollution prevention because a large amount of cement liquid as a hardening material, for example, must be mixed in the muddy water discharged to the ground.

또한, 종래의 방법은 복잡하게 퇴적된 지반이나 얇은 층이 많이 적층되어 이루어진 지반에서는 지반층의 경계를 따라 경화재가 빠져나가는 경우도 있게 되어 목적을 달성하기가 쉽지 않고, 특히 사질토지반인 경우에는 고결체가 마치 감자뿌리와 같은 형태로 만들어지기도 하여 역시 목적하는 결과를 얻기가 어려웠다.In addition, the conventional method is difficult to achieve the purpose of the hardened material in the ground consisting of a large number of complicatedly stacked ground or thin layers are difficult to achieve the purpose, especially in the case of sandy soil The condensation may be shaped like potato roots, making it difficult to achieve the desired result.

이에 본 발명은 상기와 같은 사정을 감안하여 발명한 것으로, 모래 및 소정규격 이하의 자갈과 모래성분이 액상의 경화재와 혼합된 경화재를 지반내로 주입함에 있어 지반중에서 경화재가 포대에 담겨지는 상태가 되도록 해서, 공해성 배출수의 다량배출로 인한 공해문제가 일어나지 않음과 더불어, 지반토 내에 목적으로 하는 고결체가 형성되도록 하는 연약지반 강화방법을 제공함에 그 목적이 있다.Therefore, the present invention was invented in view of the above circumstances, and in order to inject the hardened material mixed with the hardened material of the sand and the gravel and the sand component below the predetermined specifications into the ground, the hardened material is contained in the bag in the ground. Therefore, the purpose of providing a soft ground reinforcement method to form the desired solidified body in the soil, as well as the pollution problem caused by the large amount of pollution discharged water is not intended.

도 1은 본 발명의 준비단계 작업인 천공작업과정을 개략적으로 나타낸 도면,1 is a view schematically showing a drilling operation process of the preparation step work of the present invention,

도 2는 제1단계에서 천공된 구멍 내에 경화재제어용 포대와 외주입관이 삽입된 상태를 나타낸 단면도,2 is a cross-sectional view showing a state in which the hardening material control bag and the outer injection pipe is inserted into the hole drilled in the first step;

도 3은 도2에서의 외주입관 내에 내주입관이 삽입된 상태를 나타낸 단면도.3 is a cross-sectional view showing a state in which the inner injection pipe is inserted into the outer injection pipe in FIG.

도 4는 내부관을 통해 1단계 경화재가 주입되는 상태를 나타낸 설명도,4 is an explanatory view showing a state in which a one-step hardener is injected through an inner tube;

도 5는 3단계 경화재주입이 끝나고 3단계 경화재가 주입되는 상태를 나타낸 설명도,5 is an explanatory view showing a state in which the three-stage hardener injection is finished and the three-stage hardener injection is completed;

도 6은 경화재주입이 끝나 내주입관이 완전히 제거된 상태를 나타낸 설명도이다.6 is an explanatory view showing a state in which the injection of the curing material is completed and the inner injection pipe is completely removed.

이상과 같은 목적을 달성하기 위한 본 발명은, 작업할 장소의 지반에다 천공기로 소정 직경의 구멍을 천공한 다음, 이 구멍 내에 외부쪽에서부터 차례로 경화재가 담겨질 포대와 외주입관 및 내주입관을 삽입ㆍ설치한 상태에서, 상기 내주입관을 통해 경화재를 소정의 압력으로 주입하면서 내주입관을 단계적으로 상승시켜, 이 내주입관을 통해 주입되는 경화재가 내주입관의 하단부분 측벽에 형성된 관통공을 통해 분출되어 포대 속으로 강한 압력으로 투입되도록 함으로써, 지반경화재가 포대의 내부에 수용된 상태에서 강한 압력으로 지반토를 옆으로 밀어 지반토에 구멍 보다 훨씬 확경된 직경의 고결체가 형성되도록 하여 연약지반을 효과적으로 강화할 수 있도록 되어 있다.The present invention for achieving the above object is to drill a hole having a predetermined diameter in the ground of the place to work, and then insert and install the bag, the outer injection pipe and the inner injection pipe in which the hardening material will be sequentially inserted from the outside from within the hole. In one state, the inner injection pipe is gradually raised while injecting the hardening material at a predetermined pressure through the inner injection pipe, and the curing material injected through the inner injection pipe is ejected through the through hole formed in the side wall of the lower portion of the inner injection pipe, In order to effectively reinforce the soft ground by allowing the hardener to be pushed to the side with strong pressure, the solidified body of diameter much larger than the hole is formed in the ground soil. It is.

이하 본 발명을 첨부도면을 참조하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명을 실시하기 위한 준비작업으로서 지반토에다 구멍(1)을 천공하는 과정을 나타낸 것으로, 다량의 점토성분이 함유된 연약한 지반을 가진 장소에다 천공기(2)로 소정의 직경과 깊이를 가진 구멍(1)을 천공한다. 이 경우, 본 발명에서는 구멍(1)을 천공함에 있어 천공되는 구멍(1)의 깊이가 깊지 않고 직경도 비교적 크기 때문에 주로 도 1에 도시된 것과 같은 천공로드(2a)에 스크류날(3)이 회전하면서 천공하는 스크류식 천공기(2)를 사용하지만, 그 외에 회전수세식 천공기 등을 사용하여 천공하여도 됨은 물론이다.Figure 1 shows a process for drilling a hole (1) in the ground soil as a preparatory work for carrying out the present invention, a predetermined diameter and depth with a perforator (2) in a place having a soft ground containing a large amount of clay components Drill the holes 1 with. In this case, in the present invention, since the depth of the hole 1 to be drilled in the hole 1 is not deep and the diameter is relatively large, the screw blade 3 is mainly formed in the drilling rod 2a as shown in FIG. Although a screw-type punching machine 2 for punching while rotating is used, it may of course be punched out using a rotating flush punching machine or the like.

이렇게 해서 천공해놓은 지반토의 구멍(1)에는 도 2에 도시되어 있는 것과 같이 경화재제어용 포대(4)와 이 포대(4)의 내부에 외주입관(5)을 함께 삽입하는바, 이때 상기 외주입관(5)은 상기 구멍(1)의 깊이에 맞춰 그 상단부가 지상으로 조금 돌출된 상태가 되도록 삽입한다. 또, 상기 포대(4)를 삽입하는 방법으로는 포대(4) 내에 외주입관(5)이 끼위진 상태가 되도록 해서 구멍(1) 내로 삽입하여 포대(4)가 외주입관(5)의 앞끝에 걸려진 상태에서 함께 구멍(1) 내로 진입하여 삽입되도록 한다. 여기서, 상기 포대(4)의 재질로는 고압으로 주입되는 경화재(7)의 압력을 충분히 감내할 수 있는 한편 그 자체가 어느 정도의 신축성도 갖도록 하여야 하므로, 경화재의 주입압력에 따른 고결체의 확경형성에 대응할 수 있는 합성수지제 포대를 사용하게 된다.Thus, as shown in Fig. 2, the perforated ground hole 1 is inserted with the hardening material control bag 4 and the outer injection pipe 5 inside the bag 4, wherein the outer injection pipe ( 5) is inserted in such a manner that the upper end thereof protrudes slightly to the ground in accordance with the depth of the hole 1. In addition, in the method of inserting the bag 4, the bag is inserted into the hole 1 so that the outer injection pipe 5 is pinched in the bag 4 so that the bag 4 is placed at the front end of the outer injection pipe 5. In the jammed state, they enter and enter the hole 1 together. Here, as the material of the bag 4 can bear the pressure of the hardening material 7 injected at a high pressure while having a certain degree of elasticity itself, the diameter of the solidified body according to the injection pressure of the hardening material Synthetic resin bag can be used to cope with formation.

이와 같이 포대(4) 및 외주입관(5)을 지반토에 천공된 구멍(1)에 삽입한 다음 외주입관(5) 내에 내주입관(6)을 삽입하면 경화재(7)를 주입할 수 있는 상태가 된다. 이때 상기 외주입관(5) 내에 삽입되는 내주입관(6)은, 도 3에서 볼 수 있듯이 앞끝부분 일정 길이만큼이 관통공(6a)이 뚫린 다공벽을 이루면서 이 다공벽부분의 상단 및 하단부에 내주입관(6)의 외주면에서 바깥쪽으로 환형으로 돌출되어 외주입관(5)의 내주면과 접촉하게 되는 플렌지형상의 패커(Packer; 6b)가 일체로 형성된 구조로 되어 있다. 이들 패커(6b)는 도 4에 도시된 것과 같이, 상단부의 것은 내주입관(6)을 통해 경화재(7)가 주입될 때 주입되는 경화재(7)가 내주입관(6)과 외주입관(5) 사이의 공간을 통해 위쪽으로 역류하는 것을 방지하고, 하단부의 것은 경화재(7)가 아래쪽으로 분출되는 것을 막아, 결국 이들 상하단부의 패커(6b)에 의해 주입되는 경화재(7)가 내주입관(6) 앞끝부분에서 관통공(6a)을 통해 수평방향으로 방사상으로 대체로 같은 압력으로 분출되도록 하는 약할과 외주입관(5)과 내주입관 (6)사이의 간격을 일정하게 유지시키는 역할을 하게 된다.As such, when the bag 4 and the outer injection pipe 5 are inserted into the hole 1 drilled in the soil, the inner injection pipe 6 is inserted into the outer injection pipe 5 to inject the cured material 7. Becomes In this case, the inner injection pipe 6 inserted into the outer injection pipe 5 forms a porous wall through which the through hole 6a is drilled by a predetermined length as shown in FIG. 3, and the inner injection pipe at the upper end and the lower end of the porous wall part. A flange-shaped packer 6b which protrudes outwardly from the outer circumferential surface of (6) and comes into contact with the inner circumferential surface of the outer inlet pipe 5 is integrally formed. As shown in FIG. 4, these packers 6b have upper ends at the inner injection pipe 6 and the outer injection pipe 5 having the hardened material 7 injected when the hardened material 7 is injected through the inner injection pipe 6. The back flow is prevented from flowing upward through the space therebetween, and the lower end part prevents the hardened material 7 from being ejected downward, so that the hardened material 7 injected by the packer 6b of these upper and lower ends is injected into the inner injection pipe 6 At the front end, through the through hole (6a) in the horizontal direction to radially ejected at the same pressure to play the role of maintaining the interval between the weak and the outer injection pipe (5) and the inner injection pipe (6) constant.

이상과 같이 내주입관(6)이 삽입된 후에, 도 4에 도시된 것과 같이 예컨대 콘크리트펌프와 같은 경화재주입장치(도시되지 않음)로 내주입관(6)을 통해 경화재 (7)를 주입한다. 이 경우, 주입되는 경화재(7)로는 가능하면 일반적인 콘크리트와 같은 조성이 되도록 하는 것이 좋으나, 본 발명에서는 외주입관(5)이 무수한 관통공(5a)을 갖는 다공관(多孔管)으로 되어 있는 한편 내주입관(6)의 앞끝부분 역시 관통공(6a)을 갖는 다공관을 이루고 있어서, 주입되는 경화재(7)가 이들 관통공 (5a, 6a)을 모두 통과해야만 하므로 필연적으로 경화재조성을 이루는 골재성분의 최대직경에는 제한이 따르게 된다.After the inner injection pipe 6 is inserted as described above, the hardening material 7 is injected through the internal injection pipe 6 into a hard material injection device (not shown), for example, as shown in FIG. 4. In this case, the hardened material 7 to be injected is preferably made to have the same composition as general concrete, but in the present invention, the outer injection pipe 5 is a porous pipe having a myriad of through holes 5a. The front end of the inner injection pipe 6 also constitutes a porous pipe having a through hole 6a, so that the injected hardened material 7 must pass through all of these through holes 5a and 6a. There is a limit on the maximum diameter.

상기와 같이 경화재(7)가 내주입관(6)을 통해 지반의 구멍(1) 내로 주입되면, 주입되는 경화재(7)는 도 4에서 볼 수 있듯이 내주입관(6)의 앞끝부분을 이루는 다공관부분(6c)의 관통공(6a)을 통해 이 내주입관(6)의 외주에서 방사방향으로 분출되게 된다. 이때, 분출되는 경화재(7)는 이 내주입관(6)의 다공관부분(6c) 상하단부 외주면에 각기 형성된 패커(6b)에 의해 외주입관(5)과의 사이의 간격 공간이 구획되도록 되어 있기 때문에, 내주입관(6)의 관통공(6a)를 통과한 경화재(7)는 상기 패커(6b)에 의해 안내되어 외주입관(5)의 관통공(5a)을 통과해서 외주입관(5) 외부에 씌워진 상태로 되어 있는 포대(4) 속으로 들어가게 된다.When the hardening material 7 is injected into the hole 1 of the ground through the internal injection pipe 6 as described above, the injected hardening material 7 forms a front end of the internal injection pipe 6 as shown in FIG. 4. Through the through hole 6a of the part 6c, it is ejected radially from the outer periphery of this inner injection pipe 6. At this time, the hardened | cured material 7 ejected is made so that the space | interval space between the outer injection pipe 5 may be partitioned by the packer 6b formed in the outer peripheral surface of the upper and lower ends of the porous pipe part 6c of this internal injection pipe 6, respectively. Therefore, the hardening material 7 which has passed through the through hole 6a of the inner injection pipe 6 is guided by the packer 6b, passes through the through hole 5a of the outer injection pipe 5, and is outside the outer injection pipe 5. It enters into the turret (4) which is in the state of being covered.

이와 같이 하여 포대(4) 속으로 들어간 경화재(7)는 그 주입부가 상기 내주입관(6)에 갖춰진 패커(6b) 등에 의해 밀폐된 상태에서 고압으로 주입되기 때문에, 유동성을 갖는 경화재(7)의 유체압이 경화재(7)가 분출되는 영역의 지반토구멍 (1)의 측벽에 작용해서 도 4에 도시된 것과 같이 해당 영역의 구멍(1)이 넓혀지게 된다. 이때 외주입관(5)의 외부에 씌위져 있는 포대(4)가 분출되는 경화재(7)에 의해 늘어나 외주입관을 중심으로 확장되어 대략 대구경 원기둥형상을 이루게 된다. 또, 이때 사용되는 포대(7)는 그 자체로서도 어느 정도의 신축성을 가진 합성수지로 된 것을 쓰게 되지만, 경우에 따라 포대(4)가 많이 넓혀져야 하는 경우에는 포대(4)의 표면에 주름을 형성시켜 약한 실로 재봉한 것을 사용함으로써 경화재(7)가 분출됨에 따라 재봉부가 펼쳐지도록 된 것을 사용하게 된다.Thus, since the injection part is injected into the bag 4 by the high pressure in the closed state by the packer 6b etc. which were provided in the said inner injection pipe 6, the hardening material 7 which has fluidity | liquidity of The fluid pressure acts on the side wall of the ground soil hole 1 in the region where the hardener 7 is ejected, and the hole 1 in the region is widened as shown in FIG. At this time, the bag 4 covered on the outside of the outer injection pipe 5 is extended by the hardening material 7 that is ejected to extend around the outer injection pipe to form a substantially large diameter cylindrical shape. In addition, the bag 7 used at this time is made of a synthetic resin having a certain degree of elasticity itself, but if the bag 4 needs to be widened in some cases, wrinkles are formed on the surface of the bag 4. By using the sewing with a weak thread so that the hardened material (7) is ejected to use the one that the sewing portion is unfolded.

이와 같이 본 발명 연약지반 개량방법에서 쓰여지는 포대(4)는, 주입되는 경화재(7)의 압력에 의해 확장되면서 내부로 분출되는 경화재(7)가 연약한 지반토(G) 내로 침투되어 들어가는 것을 제한하여, 대체로 설정된 직경의 기둥형상 고결체(P)가 형성되도록 제어하는 기능을 하게 된다.As described above, the bag 4 used in the soft ground improvement method of the present invention is limited to infiltrating into the soft soil G while the hardened material 7 ejected to the inside is expanded by the pressure of the hardened material 7 to be injected. As a result, a function of controlling the pillar-shaped solidified body P having a generally set diameter is formed.

이러한 과정을 거쳐 내주입관(6)의 다공관부분(6c)에 해당하는 구간에 경화재(7)가 소요의 양으로 분출되어 충만되고 나면, 도 5에 도시된 것과 같이 외주입관(5)은 그데로 둔체 내주입관(6)만 한 단계, 즉 내주입관(6)의 다공관부분(6c)만큼 상승시켜 다음 단계의 경화재주입으로 옮겨지게 되고, 이러한 과정이 되풀이되어 도 6에 도시된 것과 같이 여러 단계로 주입되어 형성된 다단형태(P1, P2, P3)의 고결체(P)가 지반토(G) 내에 형성되게 된다.After this process, the hardening material 7 is ejected and filled in the required amount in the section corresponding to the porous pipe portion 6c of the inner injection pipe 6, and the outer injection pipe 5 is as shown in FIG. Only the obtuse injecting tube 6 is raised by one step, that is, the porous tube portion 6c of the inner injecting tube 6 is transferred to the next step of injecting the hardened material, and this process is repeated, as shown in FIG. The solidified bodies P of the multi-stage forms P1, P2, and P3 formed by injection into the ground soil G are formed.

한편, 지금까지 설명한 것은 구멍(1)을 필요한 깊이까지 천공해놓고서 밑에서부터 위쪽으로 단계적으로 고결체(P)를 형성하는 방법에 대해 설명하였으나, 시공할 지역의 토질조건에 따라서는 필요한 깊이까지의 구멍을 유지시키기 어려운 경우도 있어, 이러한 경우에는 위에서부터 단계적으로 주입하는 하향식 주입방법을 택할 수도 있음은 물론이다.On the other hand, what has been described so far has been described how to form a solidified body (P) step by step from the bottom to the perforation of the hole (1) to the required depth, but the hole to the required depth depending on the soil conditions of the area to be constructed In some cases it is difficult to maintain, in this case, it is a matter of course that the top-down injection method to inject step by step from the top of course.

또, 본 발명에 따른 연약지반 강화방법은, 지반토의 지질에 따라 1단계의 높이를 내주입관(6)의 다공관부분(6c)의 길이를 적절히 조절함을써 쉽게 조절할 수 있어서, 경우에 따라서는 1단계의 작업만으로도 필요한 고결체를 형성할 수 있게 된다.In addition, the soft ground reinforcement method according to the present invention can be easily adjusted by appropriately adjusting the length of the porous pipe portion 6c of the inner injection pipe 6 in accordance with the geological soil of the first stage. It is possible to form the required solidified body in only one step.

이상 설명한 바와 같이 본 발명에 의하면, 연약지반을 개량 내지 강화함에 있어 골재가 함께 혼합된 경화재를 쓰게 됨으로써, 종래와 같이 지반토의 골재성분을 이용하도록 된 연약지반 개량방법과는 달리 점토와 경화재성분이 다량 함유된막대한 양의 배출수로 인한 공해문재 등이 일어나지 않게 되고, 또 팽창되는 포대가 이용되어 고결체의 직경을 쉽게 설정할 수가 있게 된다.As described above, according to the present invention, in the improvement or reinforcement of the soft ground, by using the hardened material mixed with the aggregate, the clay and the hardened material component are different from the soft ground improvement method in which the aggregate material of the ground soil is used as in the prior art. Pollution gates due to the enormous amount of effluent contained in a large amount do not occur, and the expanded bag is used to easily set the diameter of the solidified body.

또한, 주입되는 경화재가 포대에 의해 갇혀진 상태를 유지하게 됨으로써 형성되는 고결체가 거의 원기둥형상을 이루게 되고, 더불어 고결체를 형성함에 있어 경화재의 낭비가 배제될 수 있는 등의 효과가 있게 된다.In addition, the solidified material formed by maintaining the state in which the injected hardening material is trapped by the bag is almost formed in a cylindrical shape, and the waste of the hardening material can be eliminated in forming the solidified material.

Claims (3)

지반토 내에 지반경화재를 주입하여 지반토에 기둥형상 고결체가 형성되도록 함으로써 연약지반을 강화하는 방법에 있어서,In the method of reinforcing the soft ground by injecting ground hardener in the ground soil to form a columnar solidified body in the ground soil, 지반토(G)에 천공한 지반토 구멍(1) 내에 포대(4)와 다공관으로 된 외주입관 (5) 및 앞끝부분 일정거리만큼이 다공관으로 된 내주입관(6)을 삽입한 상태에서, 이 내주입관(6)을 통해 고압으로 일정 규격 이하의 골재성분이 혼합된 경화재(7)를 주입하여, 이 경화재(7)가 상기 내주입관(6) 및 외주입관(5)의 각 관통공(5a, 6a)을 통해 외주입관(5)의 주위로 방사상으로 분출되어 외주입관(5)을 에워싸도록 배치된 포대(4) 내에 갇혀진 상태에서 확장되도록 함으로써, 지반토 구멍(1)이 넓혀진 상태가 되면서 큰 직경의 원기둥형상 고결체(P)가 형성되도록 하는 것을 특징으로 하는 연약지반 강화방법.In the ground soil hole 1 drilled into the ground soil G, an outer inlet pipe 5 made of a bag 4 and a porous pipe and an inner inlet pipe 6 made of a porous pipe by a predetermined distance from the front end are inserted. Through the inner injection pipe 6, a hardened material 7 in which aggregate components of a predetermined size or less are mixed is injected at high pressure, and the hardened material 7 passes through each of the inner injection pipe 6 and the outer injection pipe 5, respectively. The ground soil hole 1 is expanded by being radially blown out around the outer injection pipe 5 through 5a and 6a so as to be enclosed in a bag 4 arranged to surround the outer injection pipe 5. Soft ground reinforcement method characterized in that to form a large diameter cylindrical solidified body (P) in a widened state. 제1항에 있어서, 상기 지하 고결체(P)를, 밑에서부터 1단계의 경화재주입을 끝마친 다음 그 위에 다음 단계의 경화재주입을 하는 등 차례로 단계별 고결체(P1, P2,‥ )을 적층시켜 형성하는 것을 특징으로 하는 연약지반 강화방법.The method of claim 1, wherein the underground solidified body (P) is formed by laminating stepwise solidified bodies (P1, P2, ...) in order, such as finishing the first stage of hardener injection from the bottom and then the next step of hardener injection. Soft ground strengthening method characterized in that. 제1항에 있어서, 상기 지하 고결체(P)를, 위에서부터 1단계의 경화재주입을끝마쳐 굳어지도록 한 다음 그 하부에 다음 단계의 경화재주입을 시행하여 단계별 고결체(P3, P2, ‥ )가 적층되도록 하여 형성하는 것을 특징으로 하는 연약지반 강화방법.The method of claim 1, wherein the underground solidified body (P) to harden after completing the first stage of hardener injection from the top, and then the hardener injection of the next stage by performing the next step of hardener (P3, P2, ‥) Soft ground reinforcement method characterized in that it is formed to be laminated.
KR1020000016472A 2000-03-30 2000-03-30 Method for Reinforcing Poor Ground KR100379076B1 (en)

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KR20010007973A (en) * 2000-10-31 2001-02-05 임철웅 Net bag type pile construction method of weak ground

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KR100811289B1 (en) 2007-04-09 2008-03-07 홍찬윤 Method for reinforcing ground and apparatus for the same
KR100811287B1 (en) 2007-04-09 2008-03-07 홍찬윤 Method for reinforcing ground and apparatus for the same
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Publication number Priority date Publication date Assignee Title
KR20010007973A (en) * 2000-10-31 2001-02-05 임철웅 Net bag type pile construction method of weak ground

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