JPS62174412A - Method and apparatus for forming hardened ground layer - Google Patents
Method and apparatus for forming hardened ground layerInfo
- Publication number
- JPS62174412A JPS62174412A JP1587886A JP1587886A JPS62174412A JP S62174412 A JPS62174412 A JP S62174412A JP 1587886 A JP1587886 A JP 1587886A JP 1587886 A JP1587886 A JP 1587886A JP S62174412 A JPS62174412 A JP S62174412A
- Authority
- JP
- Japan
- Prior art keywords
- injection hole
- injection
- flow path
- ground
- distance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000013505 freshwater Substances 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 75
- 239000007924 injection Substances 0.000 claims description 75
- 239000000463 material Substances 0.000 claims description 23
- 239000002689 soil Substances 0.000 claims description 20
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims 2
- 239000003673 groundwater Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- 238000003756 stirring Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 5
- 210000000988 bone and bone Anatomy 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は構造物の基礎地盤造成や軟弱地盤の改良等のた
めの地盤硬化層の造成方法及びその装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method and an apparatus for creating a hardened ground layer for preparing foundations for structures, improving soft ground, and the like.
（ロ）従来の技術
従来この種の地盤硬化層の造成は、対象地盤中に注入ロ
ッドを挿入し、その先端から硬化材を周辺土壌に噴射注
入して、浸透域を硬化させる方法が行われ、注入圧を高
圧とするか低圧とするか、周辺土粒子を圧密して硬化材
を注入するか、これを排除して置換的に硬化材を注入す
るかによって方法的に分岐し、それぞれ方法的な検討が
進められてきた。(B) Conventional technology Conventionally, this type of hardened ground layer was created by inserting an injection rod into the target ground and injecting hardening material into the surrounding soil from the tip of the rod to harden the seepage area. There are different methods depending on whether the injection pressure is high or low, whether the surrounding soil particles are consolidated and the hardening material is injected, or whether this is eliminated and the hardening material is injected as a replacement. Studies have been underway.
本発明は半置換的方法に属するもので、硬化材注入に先
立ち周辺土壌中の粘性上骨や比重の軽い粒子を排除して
、ポーラス化した後、その空隙部に硬化材を充填しよう
とするものである。この分野における方法としては、一
旦対象地盤中に清水を噴射して洗出しによる事前改良を
行った後、改めて硬化材注入を行うといった二度手間を
かける方向から、上部噴射孔からポーラス化のための改
良噴射、下部噴射孔から硬化材充填のための注入噴射を
行って一挙に硬化層造成注入を行う方法が採られるよう
になってきた。The present invention belongs to a semi-replacement method, in which, prior to injecting a hardening material, viscous bones and particles with light specific gravity in the surrounding soil are removed, the soil is made porous, and then the voids are filled with a hardening material. It is something. Methods in this field include injecting clean water into the target ground to perform preliminary improvement by washing it out, and then injecting hardening material again, which requires twice the effort. As an improved injection method, a method has been adopted in which injection is performed to fill the hardening material from the lower injection hole to form a hardened layer all at once.
（ハ）発明が解決しようとする問題点
しかしながら、この方法は注入噴射を側方噴射とすれば
改良の噴射による負圧が注入噴射に影響を与え、硬化材
をリフトしたり、層にエアークランクを生じさせたりし
、下方噴射にすれば硬化層の口径が小さなものとならざ
るを得ないという難点があった。(c) Problems to be Solved by the Invention However, in this method, if the injection injection is a side injection, the negative pressure caused by the improved injection will affect the injection injection, causing lifting of the hardened material and air cranking to the layer. However, if downward injection is used, the diameter of the hardened layer must be small.
なお、改良噴射による注入噴射への影響を遮断する手段
として、本件出願人による特願昭６０−４７５７６号出
願の提案がある。As a means of blocking the influence of improved injection on injection injection, there is a proposal in Japanese Patent Application No. 1983-47576 by the applicant of the present invention.
（ニ）問題点を解決するための手段
本発明は実験例を検討した結果、改良噴射孔を注入噴射
孔の背面に位置させると共に、その上下位置の距離を調
節可能にして適切な位置関係において両噴射を交錯させ
ることにより、口径が大きく、強度の高い硬化層を能率
的に造成することを可能にしたものである。(d) Means for Solving the Problems As a result of examining experimental examples, the present invention locates the improved injection hole on the back side of the injection injection hole, and makes it possible to adjust the distance between the upper and lower positions so that the improved injection hole can be adjusted in an appropriate positional relationship. By intersecting both jets, it is possible to efficiently create a hardened layer with a large diameter and high strength.
（ホ）実施例
以下図面に従って、本発明の詳細な説明する。１は注入
ロッド本体で下部側壁に第１流路２に連通ずる第１噴射
孔３、第２流路４に連通ずる第２噴射孔５、第３流路６
に連通ずる環状噴射孔７が設けられている。(e) Examples The present invention will be described in detail below with reference to the drawings. Reference numeral 1 denotes an injection rod body, and a first injection hole 3 communicating with the first flow path 2, a second injection hole 5 communicating with the second flow path 4, and a third flow path 6 are provided on the lower side wall of the injection rod body.
An annular injection hole 7 is provided which communicates with the.
第１噴射孔３と第２噴射孔５の間は継手部８１．８２が
存在し、対象地盤の土質に応じて第１噴射孔３と第２噴
射孔５の間隔距離を調整するカップリング９をその間に
介装できるようになっている。カップリング９の外壁１
０の両端部は継手部８１．８２に対応する継手部９１．
９２が設けられ、内側部には第１流路２を形成する内管
２１に嵌合する内側継手機構９３がベアリング部９４に
よって外壁ＩＯに対して回動自在に支持されている。A joint part 81, 82 exists between the first injection hole 3 and the second injection hole 5, and a coupling 9 that adjusts the distance between the first injection hole 3 and the second injection hole 5 according to the soil quality of the target ground. can be interposed in between. Outer wall 1 of coupling 9
Both ends of 0 are joint parts 91.82 corresponding to joint parts 81.82.
92 is provided, and an inner joint mechanism 93 that fits into the inner tube 21 forming the first flow path 2 is rotatably supported by a bearing portion 94 on the inner side with respect to the outer wall IO.
１２は差圧弁で第１流路２に圧送される液圧が高くなる
と下方噴出口１１を閉鎖し、低くなるとこれを開放する
。Reference numeral 12 denotes a differential pressure valve that closes the lower jet port 11 when the pressure of the liquid fed to the first flow path 2 increases, and opens it when the pressure decreases.
孔間距離の調整は以上のように均一に構成したカップリ
ング９を長さに応じた個数分介装するものであるが、差
圧弁１２、噴出口１１の構成部分も一体としたロッドク
ラウンとして、予め孔間距離を設定した複数種のものを
用意してもよいことは勿論である。そうすることにより
クラウン部分の製作費は増すことになるが、着脱のため
の労力は省かれることになる。The distance between the holes is adjusted by interposing the number of uniformly configured couplings 9 according to the length as described above, but the components of the differential pressure valve 12 and the spout 11 are also integrated as a rod crown. Of course, it is also possible to prepare a plurality of types of holes with preset distances between holes. By doing so, the production cost of the crown part will increase, but the labor required for attachment and detachment will be saved.
硬化層を造成する場合、先ず対象地盤Ａにポーリングし
てサンプリングによる土質測定を行う。土質は粘性土質
が高い程、エアー回流によるリフト効果を活発にして粘
性上骨の排出をはからなければならないので、その負圧
が硬化材噴流に影響しないように第１噴射口３と、第２
噴射口５の間隔距離を大きくしなければならない注入ロ
ッド１はその粘性度合によってカップリング９を継手部
８１．８２間に介装して間隔調整を行った後、回転上下
動機構１３に装着して、第１流路２に清水を低圧々送し
て噴出口１１から噴出しながら、対象地盤Ａに急回転下
降させて掘進し、所定深度まで挿入する。When creating a hardened layer, first, the target ground A is polled and the soil quality is measured by sampling. The more cohesive the soil, the more active the lift effect by air circulation must be to expel the viscous bone. 2
For the injection rod 1, which requires a large spacing between the injection ports 5, the spacing is adjusted by interposing the coupling 9 between the joint parts 81 and 82 depending on the degree of viscosity, and then the injection rod 1 is attached to the rotating vertical movement mechanism 13. Then, fresh water is sent to the first flow path 2 under low pressure and spouted from the spout 11, and the target ground A is rapidly rotated and lowered to dig and penetrate to a predetermined depth.
所定深度に達したところで、第１流路２への送水を停止
し第２流路４に清水を超高圧で圧送し、第３流路６にエ
アーを圧送しながら、注入ロッドを緩回転上昇させると
エアーに包囲された超高速水噴流が周辺土壌を切削攪拌
すると同時に余剰水とこれに攪拌された粘性土が地上に
向けて間隙部を上昇するエアーによってリフトされ、排
出槽Ｂに排出される。When a predetermined depth is reached, the water supply to the first channel 2 is stopped, fresh water is pumped to the second channel 4 at an ultra-high pressure, and while air is pumped to the third channel 6, the injection rod is slowly rotated upward. When this happens, the ultra-high-speed water jet surrounded by air cuts and stirs the surrounding soil, and at the same time, the surplus water and the clay soil stirred by it are lifted by the air rising in the gap toward the ground and discharged into discharge tank B. Ru.
これによって硬化材の硬化強度に悪影響を与える粘性土
や異物が洗出され、ポーラス構造化された注入のための
予備改良層Ｃが造成される。As a result, clay soil and foreign matter that adversely affect the hardening strength of the hardening material are washed out, and a porous-structured preliminary improvement layer C for injection is created.
第１噴射孔３がこの予備改良層Ｃに到達した付近で、第
１流路２に地盤硬化材を超高圧で圧送すると差圧弁１２
が噴出口１１を閉鎖して第１噴射孔３から硬化材が超高
圧噴流として噴射され、ポーラス化された予備改良ＮＣ
を撹拌し、これに混入して硬化材充填層りを造成するも
ので、これを地表部まで継続して円柱状の硬化層を造成
する。In the vicinity where the first injection hole 3 reaches this preliminary improvement layer C, when the soil hardening material is pumped into the first flow path 2 at an extremely high pressure, the differential pressure valve 12
closes the jet nozzle 11 and injects the curing material from the first jet hole 3 as an ultra-high pressure jet to form a porous pre-improved NC.
This process is continued to the ground surface to create a cylindrical hardened layer.
第３図はカップリング９の外壁１０に螺旋襞状のフラン
ジ１４を設けた場合の実施例を示すもので、フランジ１
４は噴射孔５．７からのエアー巻き水噴流によって生ず
る負圧が噴射孔３からの硬化材噴流に与える影響を阻止
すると共にジャーミング等を生じる虞れのある地層にお
いてはロッドの回転にフランジ１４が推進力を与えるの
でジャーミングの阻止には極めて効果的である。FIG. 3 shows an embodiment in which a spirally folded flange 14 is provided on the outer wall 10 of the coupling 9.
4 prevents the influence of the negative pressure generated by the air-wrapped water jet from the injection hole 5.7 on the hardening material jet from the injection hole 3, and also provides a flange for rotation of the rod in geological formations where there is a risk of jamming or the like. 14 provides propulsion, making it extremely effective in preventing jamming.
（へ）発明の作用及び効果
本発明は以上のように構成したので、粘性土や異物を洗
い出し、地層をポーラス化する予備改良と硬化材注入を
対象地盤の状態に応じた適切なノズル間隔をもって同時
に行うことができ、予備改良水噴流による負圧によって
、その下部の充填噴流が減衰したり、充填された硬化材
がリフトされてしまったりする不都合を阻止することが
できると共に、均質で極めて強度の高い硬化層を造成す
ることができる。(f) Functions and Effects of the Invention Since the present invention is constructed as described above, it is possible to wash out cohesive soil and foreign matter, perform preliminary improvement to make the stratum porous, and inject a hardening agent with appropriate nozzle spacing depending on the condition of the target ground. This can be done at the same time, and it is possible to prevent the negative pressure caused by the pre-improved water jet from attenuating the filling jet at the bottom or lifting the filled hardening material. A hardened layer with high hardness can be created.
また、カップリングの外壁ｌＯにフランジ１４を設けれ
ば、ロッド表面に沿って生ずる負圧の引張力を直接的に
阻止するので、第１噴射孔と第２噴射孔の間隔を短縮す
ることができる一方、ロッドの回転に推進力が与えられ
るのでジャーミングの防止にも大きな効果を有するもの
である。Furthermore, if the flange 14 is provided on the outer wall lO of the coupling, the tensile force of the negative pressure generated along the rod surface is directly blocked, so the distance between the first injection hole and the second injection hole can be shortened. On the other hand, since a propulsive force is applied to the rotation of the rod, it is also highly effective in preventing jamming.
図は本発明の実施例を示すもので、第１図は施工状況を
示す全体側面図、第２図は注入ロッドの要部を示す縦断
側面図、第３図は他の実施例として螺旋襞状のフランジ
を設けたカップリングの斜視図である。
１〜注入ロツド ２〜第１流路 ３〜第１噴射孔 ４〜
第２流路 ５〜第２噴射孔 ６〜第３流路 ７〜環状噴
射孔 ８１．８２〜継手部９〜カップリング ９１．９
２〜継手部 ９３〜内側継手機構 ９４〜ベアリング
１０〜カツプリングの外壁 １１〜下方噴出口 １２〜
差圧弁 １３〜回転上下動機構 １４〜フランジ
Ａ〜対象地盤 Ｂ〜排出槽 Ｃ〜予備改良層Ｄり硬化材
充填層
特許出願人 株式会社エヌ、アイ、ティ出願人代理人
弁理土石用幸吉、゛・２１第２図
第ブ図The figures show an embodiment of the present invention, in which Fig. 1 is an overall side view showing the construction situation, Fig. 2 is a longitudinal side view showing the main part of the injection rod, and Fig. 3 is a spiral fold as another embodiment. FIG. 2 is a perspective view of a coupling provided with a shaped flange. 1 - Injection rod 2 - First flow path 3 - First injection hole 4 -
Second flow path 5 - Second injection hole 6 - Third flow path 7 - Annular injection hole 81.82 - Joint part 9 - Coupling 91.9
2 ~ Joint part 93 ~ Inner joint mechanism 94 ~ Bearing
10 ~ Outer wall of coupling ring 11 ~ Lower spout 12 ~
Differential pressure valve 13 ~ Rotation and vertical movement mechanism 14 ~ Flange A ~ Target ground B ~ Discharge tank C ~ Preliminary improvement layer D hardening material filled layer Patent applicant N.I.T Co., Ltd. Applicant's agent Kokichi Patent Soil and Stone Co., Ltd.・21 Figure 2 Figure B
Claims (4)
背面側の位置に環状噴射孔によって周囲を包囲された第
２噴射孔を設けると共に第１、第２両噴射孔の上下位置
における間隔距離を調節可能に構成した注入ロッドを、
対象地盤の土質によって決定した距離間隔に孔間距離を
設定して対象地盤の所定深度まで挿入し、第２噴射孔か
ら清水、これを包囲する環状噴射孔からエアー、第１噴
射孔から地盤硬化材を高圧力で噴射しながら、注入ロッ
ドを回転上昇させることにより、ロッドの周辺土壌に地
盤硬化材を注入して、その部分を硬化層に造成すること
を特徴とする地盤硬化層の造成方法(1) A first injection hole is provided in the lower side wall, and a second injection hole surrounded by an annular injection hole is provided above the first injection hole at a position on the back side of the first injection hole, and both the upper and lower portions of the first and second injection holes are provided. The injection rod is configured such that the distance between the positions can be adjusted.
The distance between the holes is set at intervals determined by the soil quality of the target ground, and the holes are inserted to a predetermined depth in the target ground, and fresh water is supplied from the second injection hole, air is supplied from the annular injection hole that surrounds it, and ground hardening is performed from the first injection hole. A method for creating a soil hardening layer, which is characterized by injecting a soil hardening material into the soil around the rod by rotating and raising an injection rod while injecting the material at high pressure, and creating a hardened layer in that part.
上部で第１噴射孔の背面側の位置に第３流路に連通する
環状噴射孔によって周囲を包囲され、第２流路に連通す
る第２噴射孔を設けると共に、第１、第２両噴射孔の上
下位置における間隔距離を調整可能に構成した注入ロッ
ドを回転上下動機構によって駆動するように支持して成
る地盤硬化材の注入装置(2) A first injection hole in the lower side wall that communicates with the first flow path, surrounded by an annular injection hole that communicates with the third flow path at a position on the back side of the first injection hole in the upper part, and a second flow path. Ground hardening comprising a second injection hole that communicates with the road, and an injection rod that is configured to be able to adjust the distance between the first and second injection holes in the vertical positions and is supported so as to be driven by a rotating vertical movement mechanism. material injection device
において、第１噴射孔と第２噴射孔の間隔距離の調整は
、第１噴射孔設置部と第２噴射孔設置部の間に連結部を
設け、設定長さに応じたカップリングをその間に介装す
るようにした地盤硬化材注入装置(3) In the soil hardening material injection device according to claim (2), the adjustment of the interval distance between the first injection hole and the second injection hole is performed between the first injection hole installation part and the second injection hole installation part. A soil hardening material injection device that has a connecting part between the two and a coupling according to the set length inserted between them.
において、第１噴射孔と第２噴射孔の間隔距離の調整は
、第１噴射孔と第２噴射孔の距離を適宜設定した一体も
ののロッドクラウンを注入ロッドに装着するようにした
地盤硬化材注入装置（５）特許請求の範囲（３）記載の
地盤硬化材注入装置において、距離調整用カップリング
の外壁には螺旋襞状のフランジを設けるようにした地盤
硬化材注入装置(4) In the soil hardening material injection device according to claim (2), the distance between the first injection hole and the second injection hole is adjusted by appropriately setting the distance between the first injection hole and the second injection hole. Ground hardening material injection device (5) In the ground hardening material injection device according to claim (3), the outer wall of the distance adjustment coupling is provided with spiral folds. Ground hardening material injection device equipped with a flange
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1587886A JPS62174412A (en) | 1986-01-29 | 1986-01-29 | Method and apparatus for forming hardened ground layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1587886A JPS62174412A (en) | 1986-01-29 | 1986-01-29 | Method and apparatus for forming hardened ground layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62174412A true JPS62174412A (en) | 1987-07-31 |
Family
ID=11901047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1587886A Pending JPS62174412A (en) | 1986-01-29 | 1986-01-29 | Method and apparatus for forming hardened ground layer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62174412A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01318616A (en) * | 1988-06-20 | 1989-12-25 | Nit Co Ltd | Method of construction for ground hardener injecting |
| JPH0762642A (en) * | 1992-06-02 | 1995-03-07 | Tokiwa Kensetsu Kk | Sludge suction and injection method and injection device |
| JPH07158050A (en) * | 1993-12-03 | 1995-06-20 | Nissan Kensetsu Kk | Soil improvement work method by high-pressure injection and agitation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5490812A (en) * | 1977-12-27 | 1979-07-18 | Kajima Corp | Grout injector |
-
1986
- 1986-01-29 JP JP1587886A patent/JPS62174412A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5490812A (en) * | 1977-12-27 | 1979-07-18 | Kajima Corp | Grout injector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01318616A (en) * | 1988-06-20 | 1989-12-25 | Nit Co Ltd | Method of construction for ground hardener injecting |
| JPH0762642A (en) * | 1992-06-02 | 1995-03-07 | Tokiwa Kensetsu Kk | Sludge suction and injection method and injection device |
| JPH07158050A (en) * | 1993-12-03 | 1995-06-20 | Nissan Kensetsu Kk | Soil improvement work method by high-pressure injection and agitation |
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