KR920009740B1 - Making method of soil cement pile in situ - Google Patents

Making method of soil cement pile in situ Download PDF

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KR920009740B1
KR920009740B1 KR1019890016102A KR890016102A KR920009740B1 KR 920009740 B1 KR920009740 B1 KR 920009740B1 KR 1019890016102 A KR1019890016102 A KR 1019890016102A KR 890016102 A KR890016102 A KR 890016102A KR 920009740 B1 KR920009740 B1 KR 920009740B1
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nozzle
injection
layer
annular
injection pipe
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KR1019890016102A
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Korean (ko)
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KR910010018A (en
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와타루 나카니시
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주식회사 표준개발
임병구
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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

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

Abstract

The method employs an injection pipe (1) supported by a rotary up-and-down drive mechanism (2) and having at its tip nozzles (3) each comprising a central nozzle (32) and an annular nozzle (33) about the nozzle (32), with an excavating blade (31) attached to the front end. The central nozzle and annular nozzle respectively have separate feed lines passing through a swivel (4). A solidifying agent is injected into the ground to form a solidifying layer (X) into which the injection pipe (1) is positioned in center for the central nozzle to inject water end for the annular nozzel to blast compressed air, while the pipe (1) withdrawing in rotation to draw up earth in water from the central part of the layer (X) to hollow it.

Description

중공경화층조성공법Hollow hardened layer construction method

제1도는 본 발명에 따른 시공상황을 설명하는 전체개략도.1 is an overall schematic diagram illustrating a construction situation according to the present invention.

제2도는 분사노즐의 1례를 도시한 것으로 분사관선단의 요부확대단면도이다.2 shows an example of the injection nozzle, which is an enlarged cross-sectional view of the main portion of the injection pipe tip.

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

1 : 분사관 2 : 회전상하이동기구1: injection pipe 2: rotating mechanism

3 : 분사노즐 3a : 상부노즐3: injection nozzle 3a: upper nozzle

3b : 하부노즐 4 : 스위벨3b: Lower nozzle 4: Swivel

5 : 팩킹푸울 6 : 여과기5: packing pool 6: filter

31 : 굴삭날 32 : 중심노즐31: Excavation blade 32: center nozzle

33 : 환상노즐 51 : 흡입펌프33: annular nozzle 51: suction pump

X : 경화재주입층 Y : 원X: Hardening material injection layer Y: Circle

Z : 크리어런스Z: Clearance

본 발명은 땅속구조물의 지지나, 복공(覆工), 유연지반의 안정과 방수 및 토류(土留) 등에 폭넓게 이용되는 지반경화층조성공법에 관한 것으로, 특히 원기둥형상경화층의 코아(Core)부분을 중공구조로 해서 그 크리어런스(Clearance)를 최대로 이용하도록 된 중공경화층조성공법에 관한 것이다.BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a ground hardening layer construction method that is widely used for supporting underground structures, stabilizing holes, stabilizing flexible soils, waterproofing and earthing, and in particular, core portions of cylindrical hardened layers. This invention relates to a hollow hardened layer construction method in which the hollow structure is used to make the best use of the clearance.

종래에는 경화재를 주입해서 경화층을 조성함에 있어, 선단측벽에 설치된 분사노즐로 경화재를 고압으로 분사하면서 주입관을 회전상승시켜 원기둥형상의 경화재주입층을 조성하게 되는 고압주입공법을 비롯 압밀충전법(壓密充塡法)과 치환충전법(置換充塡法), 저압주입법등 여러가지 형태의 공법이 시행되고 있었지만, 이들 어느것이나 지반을 경화시켜주도록만 되어 있었다.Conventionally, in order to form a hardened layer by injecting a hardened material, a high pressure injection method including a high pressure injection method of forming a cylindrical hardened material injection layer by rotating the injection tube while rotating the hardened material by spraying the hardened material at a high pressure with an injection nozzle provided on the side wall thereof Although various forms of construction have been carried out, such as a method of substitution, a method of substitution filling, and a low pressure injection method, all of these methods are only intended to harden the ground.

그런데 이와 같은 종래의 지반경화층은 모두 크리어런스가 전혀 없는 경화층이기 때문에 유연지층을 충분히 응고ㆍ강화시켜 목적을 달성할 수가 있으나, 코아부분에 다시 작업을 해야할 필요가 있을 경우에는 중공경화층을 조성하는 것이 편리하다. 특히 최근에는 직경이 60m에 달하는 큰 직경의 경화층을 단번에 조성할 수가 있기 때문에, 코아부분을 중공형태로 하게 되면 중공부가 작업공간주변인 공간복공벽을 단번에 조성할 수가 있게 된다. 그렇지만,한번 굳어진 경화층의 코아부분은 견고해서 굴삭작업이 곤란하고, 굳어지기전의 경화층에다 굴삭작업을 하게 되면 경화층지반이 내려앉게 되어 작업이 곤란해지게 된다고 하는 문제점이 있었다.However, since all of these conventional ground hardening layers are hardened layers with no clearance at all, the flexible ground layer can be solidified and strengthened sufficiently to achieve the purpose. However, when the core portion needs to be reworked, the hollow hardened layer may be used. It is convenient to create. In particular, in recent years, since a large diameter hardened layer having a diameter of 60 m can be formed at once, when the core portion has a hollow shape, it becomes possible to form a space restoration wall around the working space at once. However, the core portion of the hardened layer once hardened is difficult to excavation work, when the excavation work to the hardened layer before hardening, there was a problem that the hardened layer ground down and becomes difficult to work.

이에 본 발명은 이와 같은 문제를 해결하기 위해 발명된 것으로, 경화재주입층의 경화재가 응고되기 전에 당해 요소부분에 중심노즐과 이를 둘러싸는 환상노즐로 구성된 분사노즐을 갖춘 분사관을 삽입하여, 상기 중심노즈로부터는 맑은 물을, 환상노즐로부터는 공기를 동시에 분사함으로써 당해 요소부분의 경화재혼입토사를 붕괴시켜 맑은 물과 교반혼합시킴과 더불어, 분사되는 공기에 의해 발생되는 에어리프트(Air Lift) 효과로 이와 같이 교반혼합되어진 경화재혼입토사를 리프트배출시켜주게 된다.Accordingly, the present invention has been invented to solve such a problem, and before the hardened material of the hardened material injection layer is solidified, an injection pipe having an injection nozzle composed of a central nozzle and an annular nozzle surrounding the element is inserted into the corresponding element portion, thereby forming the center. By simultaneously spraying clean water from the nose and air from the annular nozzle, the hardened material mixing soil of the urea part is collapsed to stir and mix with the clear water, and the air lift effect generated by the sprayed air As described above, lift-discharge the hardened material mixed soils mixed with stirring.

따라서 분사노즐로부터 분사되는 맑은 물이 분사관의 주변토양을 굴삭하게 됨과 동시에 굴삭된 토양이 분사된 물과 교반혼합되게 되고, 공기는 분사된 맑은 물과 함께 혼합토사의 유동거리를 연장시켜주게 되는 한편 그 상승력에 의해 에어리프트효과를 발생하게 되어, 분사된 물과 혼합된 배토를 리프트배출시켜주게 된다.Therefore, the clear water sprayed from the spray nozzle excavates the surrounding soil of the spray pipe, and the excavated soil is stirred and mixed with the sprayed water, and the air extends the flow distance of the mixed soil with the sprayed clear water. On the other hand, the lift force generates the airlift effect, and lifts and discharges the clay mixed with the injected water.

이하 본 발명의 실시예를 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter will be described in detail with reference to the accompanying drawings, embodiments of the present invention.

참조부호 1은 분사관으로서, 회전상하구동기구(2)에 의해 지지되면서 그 선단측벽에는 중심노즐(32)과 이 중심노즐(32)을 둘러싸는 환상노즐(33)으로 구성된 분사노즐(3)이 갖추어지고, 그 선단부에는 굴삭날(31)이 형성되어 있다. 그리고 상기 중심노즐(32)과 환상노즐(33)은 각기 별개의 유로와 통하도록 개방되면서 이들 유로로 스위벨(4)을 통과하는 각각 다른 분사소재가 공급될 수 있도록 되어 있다.Reference numeral 1 denotes an injection pipe, which is supported by the rotary up / down drive mechanism 2 and has a jet nozzle 3 including a central nozzle 32 and an annular nozzle 33 surrounding the central nozzle 32 on the front end side wall thereof. Is provided, and the excavation blade 31 is formed in the front-end | tip part. The center nozzle 32 and the annular nozzle 33 are opened so as to communicate with separate flow paths so that different injection materials passing through the swivel 4 can be supplied to these flow paths.

또한, 분사노즐(3)의 상부노즐(3a)과 하부노즐(3b)은 그 간격이 약 50㎝ 정도로 형성되어져 있는 바, 이와 같이 구성된 분사관(1)이 윤활수를 적절히 분출하면서 고속회전해서 대상지반에 소정깊이까지 추진하강하여 소정깊이에 도달하게 되면, 상기 상부노즐(3a)로부터는 공기(A)가 혼합된 맑은 물(B)을, 상기 하부노즐(3b)로부터는 공기(C)가 혼합된 경화재(D)를 각각 700㎏/㎠의 고압으로 분사하면서 분사관(1)을 회전상승시키게 됨으로써 경화재주입층(X)을 조성하게 된다. 이와 같이 조성된 경화재주입층(X)은 상기 상부노즐(3a)의 세척교반분사와 하부노즐(3b)의 경화재충전교반분사에 의한 상승(相乘)효과에 의해 매우 큰 직경을 갖는 원주형상을 얻을 수 있게 된다.In addition, the interval between the upper nozzle 3a and the lower nozzle 3b of the injection nozzle 3 is about 50 cm, and the injection pipe 1 comprised in this way rotates at high speed, spraying lubricant water suitably, When it descends to a predetermined depth and reaches a predetermined depth, clear water B mixed with air A is mixed from the upper nozzle 3a, and air C is discharged from the lower nozzle 3b. The injection pipe 1 is rotated while the mixed curing material D is sprayed at a high pressure of 700 kg / cm 2, respectively, thereby forming a curing material injection layer X. The cured material injection layer (X) thus formed has a cylindrical shape having a very large diameter due to the synergistic effect caused by the cleaning stirring spraying of the upper nozzle 3a and the hardener filling stirring of the lower nozzle 3b. You can get it.

또, 경화재주입층(X)은 고압주입이나 저압주입, 치환충전, 압밀충전등 여러가지방법으로 경화재를 주입시켜 만들어진 것으로, 또 수직방향으로 지반경화층을 조성한 경우 또는 수평방향으로 지반경화층을 조성할 경우에도 경화재가 주입되어 응고되기 전의 것이라면 상기 어느방법에서라도 본 발명을 적용시킬 수가 있다.In addition, the hardening material injection layer (X) is made by injecting the hardening material by various methods such as high pressure injection, low pressure injection, substitution charging, consolidation charging, and when the ground hardening layer is formed in the vertical direction or the ground hardening layer is formed in the horizontal direction. In this case, the present invention can be applied to any of the above methods as long as the curing material is injected and solidified.

여기서, 주입경화재가 응고되기 이전에 다시 경화재주입층(X)의 코아부분에 분사관(1)을 재삽입시키게 되는 바, 상기 주입층(X)의 코아부분은 경화재가 응고되기전에는 연한지반상태가 되므로 상기 분사관(1)을 삽입시켜주는 수단은 적절히 선택해서 사용하게 된다. 그리고 분사관(1)이 주입층(X)의 바닥부 또는 소정 위치에 도달하도록 분사노즐(3)로부터 공기가 포함된 맑은 물을 400㎏/㎠의 고압으로 분사하면서 천천히 회전상승시키게 되면, 이 고압의 물이 상기 주입층의 코아부분을 분사압의 크게 따라 형성된 원(Y)을 만들어 굴삭붕괴시키게 됨과 더불어 진흙덩어리상태로 만들어 상기 분사에너지를 흡수하면서 분사된 물과 혼합교반하게 되고, 이와 같이 교반혼합되어진 것이 분사된 공기의 상승력에 따라 나타나는 에러리프트(Air Lift)효과에 의해 팩킹푸울(5)로 상승ㆍ배출시켜주기 되며, 다시 흡입펌프(51)에 의해 여과기(6)로 흡입되어 압송되게 된다.Here, the injection tube 1 is reinserted into the core portion of the hardener injection layer X before the injection hardener solidifies, and the core portion of the injection layer X is soft ground before the hardener solidifies. Since the means for inserting the injection pipe 1 is to be used as appropriately selected. When the injection pipe 1 slowly rotates while spraying clean water containing air from the injection nozzle 3 at a high pressure of 400 kg / cm 2 so as to reach the bottom or a predetermined position of the injection layer X, The high pressure water causes the core part of the injection layer to form a circle (Y) formed according to the large injection pressure, excavates and collapses it, and makes a mud lump to mix and stir the water sprayed while absorbing the injection energy. The stirring and mixing are lifted up and discharged to the packing pool 5 by the air lift effect shown by the lift force of the injected air, and are sucked into the filter 6 by the suction pump 51 and then pumped. Will be.

이어 상기 여과기(6)에서 여과되어진 진흙덩이 혼합수는 다시 분사관(1)으로 공급되어 분사수로 이용되게 되는 바, 여기서 상기 분사노즐(3)은 1개 또는 여러개를 사용해도 좋다. 그리고 경화재주입층(X)을 수평방향으로 조성할려는 경우에는 분사공기의 상승력이 분사관(1)의 삽입크리어런스(Z)에서 회전하게 되는 분출력으로 나타나게 되나, 배출력이 부족할 경우에는 흡입펌프(51)에 의해 보충되게 되는 바, 경우에 따라서는 공기를 분사시킨 흡입펌프(51)만으로도 보충해줄 수가 있다.Subsequently, the mud lump mixed water filtered by the filter 6 is again supplied to the injection pipe 1 to be used as the injection water. Here, one or more injection nozzles 3 may be used. In the case where the hardener injection layer X is to be formed in the horizontal direction, the upward force of the sprayed air appears as a partial output which rotates at the insertion clearance Z of the injection pipe 1, but when the discharge force is insufficient, suction The replenishment is performed by the pump 51. In some cases, the replenishment may be performed only by the suction pump 51 in which air is injected.

이상과 같은 본 발명에 의하면, 경화재주입층(X)의 코아부분은 아주스무스하게 굴삭제거시킬 수가 있어 중공경화층을 신속하고 간단히 조성할 수가 있는 효과가 있다.According to the present invention as described above, the core portion of the hardened material injection layer (X) can be removed very smoothly, there is an effect that can quickly and simply form a hollow hardened layer.

Claims (1)

땅속에다 경화재주입층(X)을 조성하고 나서 주입된 경화재가 경화되기 전에 이 경화재주입층(X)의 소정위치에다 중심부에 형성된 중심노즐(32)과 이 중심노즐(32)을 둘러싸고 있는 환상노즐(33)로 구성된 분사노즐(3)이 선단측벽에 형성된 분사관(1)을 삽입하고, 이어 상기 중심노즐(32)로부터는 맑은 물을 환상노즐(33)로부터는 공기를 동시에 고압분사시키되 상기 분사관(1)을 회전시키면서 후퇴시켜줌으로써 주입층중심부의 토사를를 리프트배출시키도록 된 중공경화층조성공법.The center nozzle 32 formed in the center and the annular nozzle surrounding the center nozzle 32 at a predetermined position of the curing material injection layer X after the curing material injection layer X is formed in the ground and before the injected curing material is cured The injection nozzle (3) consisting of (33) is inserted into the injection pipe (1) formed on the tip side wall, and then the high-pressure jet of air from the annular nozzle 33 at the same time clear water from the central nozzle (32) The hollow hardened layer formation method which lifts and discharges the earth and sand of the injection-bed center part by retracting while rotating the injection pipe (1).
KR1019890016102A 1989-11-07 1989-11-07 Making method of soil cement pile in situ KR920009740B1 (en)

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KR920009740B1 true KR920009740B1 (en) 1992-10-22

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