JP3376261B2 - Soil hardened layer formation method by cavitation jet - Google Patents
Soil hardened layer formation method by cavitation jetInfo
- Publication number
- JP3376261B2 JP3376261B2 JP31755297A JP31755297A JP3376261B2 JP 3376261 B2 JP3376261 B2 JP 3376261B2 JP 31755297 A JP31755297 A JP 31755297A JP 31755297 A JP31755297 A JP 31755297A JP 3376261 B2 JP3376261 B2 JP 3376261B2
- Authority
- JP
- Japan
- Prior art keywords
- jet
- nozzle
- injection
- hardening material
- pressure
- 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.)
- Expired - Fee Related
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明はトンネル等地中坑道
の覆工支保や構築基礎地盤の強化支保、或いは止水を目
的として掘削地盤の周囲等に地盤硬化材をキャビテーシ
ョン噴流により注入して地盤硬化層を造成するキャビテ
ーション噴流による地盤硬化層造成工法とその装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining support for lining underground tunnels such as tunnels, a reinforcement support for a foundation ground for construction, or a cavitation jet to inject a ground hardening material into the periphery of an excavated ground for the purpose of stopping water. The present invention relates to a ground hardened layer forming method by a cavitation jet for forming a hardened layer and an apparatus therefor.
【０００２】[0002]
【発明が解決しようとする課題】従来、地盤の覆工支保
や強化支保、或いは止水を目的とする硬化材層造成のた
めの地盤硬化材注入は、硬化材噴流の到達距離を少しで
も延長して大径の硬化材層を造成することを理想とし、
エアー巻き噴流など様々な工夫が凝らされてきたが、い
ずれも硬化材噴射の噴射圧自体を高圧化し付帯構成によ
って噴射圧の低下を防止することに中心が置かれてきた
た。Conventionally, the injection of the ground hardening material for the purpose of forming a hardening material layer for the purpose of supporting the lining and strengthening of the ground, or for the purpose of stopping water is to extend the reaching distance of the hardening material jet as much as possible. Ideally to create a large diameter hardened material layer,
Various efforts have been made, such as an air-wound jet, but in each case, the injection pressure of the curing material injection itself was increased to prevent the decrease of the injection pressure by the incidental structure.
【０００３】しかしながら、硬化材噴射の噴射圧自体を
高圧化することには限界があり、また、高圧作動による
危険を伴うという問題が付きまとっている。However, there is a limit to increasing the injection pressure itself of the curing material injection, and there is a problem in that there is a danger due to high-pressure operation.
【０００４】[0004]
【課題を解決するための手段】本発明は、上記の課題に
対応してこれを解決するため、重合する核噴流と囲周噴
流との噴射圧に較差を設けることによって発生するキャ
ビテーション現象を地盤硬化材注入における噴流の地盤
破砕力と噴流推進力増進に利用するように構成したもの
である。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to solve them, the present invention provides a ground for a cavitation phenomenon caused by providing a difference in injection pressure between a superposed nuclear jet and a circumferential jet. It is configured to be used to enhance the ground crushing force of the jet flow and the jet propulsion force when the hardening material is injected.
【０００５】すなわち、従来、エアー巻き噴流など造成
に用いられてきた重合噴射ノズルの核ノズルから高圧に
よる硬化材噴流、囲周ノズルから核ノズルからの硬化材
噴流より低圧の硬化材噴流を噴射することにより、高圧
噴流と低圧噴流の境界の相対速度差により境界付近に渦
が発生し、渦中心には低圧領域が生じてここにキャビテ
ィ（空洞）が多数生ずる。That is, a hardening material jet due to a high pressure is injected from a core nozzle of a polymerization injection nozzle that has been conventionally used for creating an air-winding jet, and a hardening material jet having a lower pressure than the hardening material jet from a surrounding nozzle is injected from a surrounding nozzle. As a result, a vortex is generated near the boundary due to the relative velocity difference between the boundary between the high-pressure jet and the low-pressure jet, and a low-pressure region is generated at the center of the vortex, and a large number of cavities (cavities) are generated there.
【０００６】キャビティは対象地盤と噴流の接触面まで
成長を続け対象地盤と噴流の接触面付近で消滅するが、
消滅の際に発生するショックウエーブとジェット流によ
り対象地盤に対する噴流作用面積が拡張され、地盤破砕
力と噴流推進力が発生するものである。The cavity continues to grow up to the contact surface between the target ground and the jet, and disappears near the contact surface between the target ground and the jet.
The shock wave and jet flow generated at the time of extinction expands the jet action area on the target ground, generating ground crushing force and jet propulsion force.
【０００７】キャビテーション噴流は、この地盤破砕力
と噴流推進力を発生する面積が通常のジェットに比べ数
倍から数十倍広いので、地盤破砕力と噴流推進力も極め
て強力なものとなる。The cavitation jet has an area where the ground crushing force and the jet propulsion force are generated is several times to several tens of times larger than that of an ordinary jet, so that the ground crushing force and the jet propulsion force are also extremely strong.
【０００８】本発明は、このキャビテーション噴流を通
常の硬化材噴射、瞬結性硬化材のＡ液とＢ液の混合噴
射、更には先行改良噴射、パッキング噴流噴射に適用す
るようにしたものである。According to the present invention, this cavitation jet is applied to ordinary hardening material injection, mixed injection of liquid A and liquid B of the instantaneous hardening material, further improved injection, and packing jet injection. .
【０００９】[0009]
【発明の実施の形態】以下図面に従って本発明の実施の
形態を説明する。１は注入ロッドでその１流路11、その
２流路12を備え、各流路はそれぞれ核ノズル21、囲周ノ
ズル22に連通して開口し、ノズル21、22は重合して重合
噴射ノズルを構成する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 is an injection rod, which is provided with one channel 11 and two channels 12 thereof, and each channel communicates with a core nozzle 21 and a surrounding nozzle 22 to open, and the nozzles 21 and 22 are polymerized to form a polymerization injection nozzle. Make up.
【００１０】その１流路11とその２流路12に、それぞれ
硬化材を圧送する圧送ポンプは送圧力に所定の較差が設
けられ、核ノズル21への圧送ポンプは高圧、囲周ノズル
22への圧送ポンプは低圧となっており、噴射時に重合し
てキャビテーション噴流を構成するようになっている。A pressure feeding pump for feeding the hardened material to each of the first flow passage 11 and the second flow passage 12 is provided with a predetermined difference in feed pressure, and the pressure feeding pump for the core nozzle 21 is a high pressure, peripheral nozzle.
The pressure pump to 22 is at a low pressure, and is superposed during injection to form a cavitation jet.
【００１１】注入ロッド１の後端はスイベル３と圧送ポ
ンプを介して材料供給部に連絡するホース31、32に連結
すると共に、基台４上に装置された注入ロッド作動機構
５とロッド転向機構６に支持される。The rear end of the injection rod 1 is connected to hoses 31 and 32 which are connected to the material supply unit via a swivel 3 and a pressure pump, and an injection rod operating mechanism 5 and a rod turning mechanism installed on the base 4. Supported by 6.
【００１２】先ず、ロッド転向機構６によって挿入対象
地盤に対する注入ロッド１の角度を垂直方向、水平方
向、仰向方向に転向させると共に、注入ロッド作動機構
５が注入ロッド１を対象地盤Ｇに挿入させるため注入ロ
ッド１に対して前進、後退、回転等の作動を与える。First, the rod turning mechanism 6 turns the angle of the injection rod 1 with respect to the ground to be inserted in the vertical direction, the horizontal direction, and the upward direction, and the injection rod operating mechanism 5 inserts the injection rod 1 into the target ground G. Therefore, the injection rod 1 is operated to move forward, backward, and rotate.
【００１３】このように装置された注入ロッド１を対象
地盤Ｇに向けて推進挿入し、所定の深度に達したところ
で、その１流路11に超高圧の硬化材噴流、その２流路12
にそれよりも低圧の硬化材噴流を圧送して重合噴射ノズ
ル21、22から噴射しつつ、注入ロッド１を回転させなが
ら抜去方向に後退させれば、硬化材噴流はキャビテーシ
ョン噴流として周辺地盤を穿孔切削し土粒子を破砕し
て、対象地盤Ｇに注入ロッド１の駆動軌跡に沿って円筒
状に硬化材注入層Ｘを造成する。The injection rod 1 thus arranged is propelled and inserted toward the target ground G, and when a predetermined depth is reached, a super-high pressure hardening material jet is flown into the first passage 11 and the second passage 12 thereof.
When the hardening material jet having a pressure lower than that is pumped and injected from the superpositioning injection nozzles 21 and 22, the injection rod 1 is rotated and retracted in the removal direction, the hardening material jet perforates the surrounding ground as a cavitation jet. The soil particles are cut and crushed, and the hardening material injection layer X is formed in the target ground G along the drive locus of the injection rod 1 into a cylindrical shape.
【００１４】瞬結性硬化材を用いる場合には、注入ロッ
ド１を対象地盤Ｇに向けて推進挿入し、所定の深度に達
したところで、その１流路11にＡ液を超高圧の硬化材噴
流として、その２流路12にＢ液をそれよりも低圧の硬化
材噴流として圧送して重合噴射ノズル21、22から噴射し
つつ、注入ロッド１を回転させながら抜去方向に後退さ
せれば、Ａ液とＢ液は混合キャビテーション噴流として
周辺地盤を穿孔切削し土粒子を破砕して、対象地盤Ｇに
注入ロッド１の駆動軌跡に沿って円筒状に２液性硬化材
の混合注入層Ｘを造成する。In the case of using a quick-setting hardening material, the injection rod 1 is propelled and inserted toward the target ground G, and when a predetermined depth is reached, the liquid A is injected into the one channel 11 of the hardening material at an ultrahigh pressure. As a jet flow, liquid B is pumped to the two flow paths 12 as a hardening material jet flow having a lower pressure than that and jetted from the polymerization jet nozzles 21 and 22, while the injection rod 1 is rotated and retracted in the removal direction, The liquids A and B are mixed cavitation jets to pierce and cut the surrounding ground to crush the soil particles, and the mixed injection layer X of the two-liquid hardening material is cylindrically formed on the target ground G along the drive locus of the injection rod 1. Create.
【００１５】更に、パッキング噴流を用いる場合には、
注入ロッドにその３流路13、その４流路14を設け、各流
路が重合噴射ノズル21、22から所定の間隔を置いた位置
に開口する重合噴射ノズルの核ノズル23、囲周ノズル24
に連通するように構成し、核ノズル23から清水或いは粘
性水もしくは高分子ポリマー溶液等、パッキング噴流を
構成する流体を高圧で、囲周ノズル24から同じく清水或
いは粘性水もしくは高分子ポリマー溶液等、パッキング
噴流を構成する流体を核ノズル23より低圧で噴射し、重
合するキャビテーション噴流として噴射する。Further, when using a packing jet,
The injection rod is provided with the three flow passages 13 and the four flow passages 14, and each flow passage is opened at a position spaced from the polymerization injection nozzles 21, 22 by a predetermined distance.
The core nozzle 23, fresh water or viscous water or high-polymer solution, such as high-pressure fluid forming the packing jet, the surrounding nozzle 24 also fresh water or viscous water or high-polymer solution, etc., The fluid forming the packing jet is jetted from the nuclear nozzle 23 at a low pressure and jetted as a superposed cavitation jet.
【００１６】重合噴射ノズル23、24は、重合噴射ノズル
21、22の上部位置に開口しているので、重合噴射ノズル
21、22からの硬化材噴射によって発生する地内圧の上昇
をパッキング噴流Ｙによって抑制し、噴射方向に誘導し
て硬化材噴流の到達距離を伸長させる。The superposition injection nozzles 23 and 24 are superposition injection nozzles.
Since it opens at the upper position of 21, 22, the superposition injection nozzle
The increase in the underground pressure generated by the injection of the hardening material from 21, 22 is suppressed by the packing jet Y, and is guided in the injection direction to extend the reaching distance of the hardening jet.
【００１７】このように重合噴射ノズル23、24からのパ
ッキング噴流による噴流バリアと加速力によって高圧噴
射の地内圧と余剰スライムは噴射方向に引き込み誘導さ
れて、適度な注入環境を保つので噴射硬化材の到達距離
を伸長すると共に、到達距離の伸長が注入域の混入容量
を増大させる。In this way, the jet barrier and the accelerating force of the packing jets from the superposition jet nozzles 23 and 24 cause the ground pressure of the high-pressure jet and the surplus slime to be drawn and guided in the jet direction to maintain an appropriate injection environment. And the extension of the reach increases the mixing volume of the injection zone.
【００１８】この混入容量の増大により、従来、スライ
ムの噴出による排泥現象を生じていたものが、排泥が殆
ど無い状態で硬化材の土壌への混入を継続することがで
きるものである。Due to this increase in the mixing capacity, although the mud discharge phenomenon caused by the ejection of slime has conventionally been generated, the hardening material can be continuously mixed into the soil with almost no mud discharge.
【００１９】更に、注入ロッド１を対象地盤Ｇに挿入す
る際に、上部重合噴射ノズルの核ノズル23から高圧によ
る流体噴流、囲周ノズル24から核ノズル23からの流体噴
流より低圧の流体噴流を噴射することにより流体をキャ
ビテーション噴流として噴射しながら注入ロッドを回動
させつつ注入ロッドを対象地盤の所定深度まで挿入すれ
ば、周辺土壌はキャビテーション噴流により穿孔破砕さ
れ、ロッド１が所定深度まで挿入されるまでに周辺土壌
の先行改良が行われる。Furthermore, when inserting the infusion rod 1 to the target ground G, fluid jet by the high-pressure from above polymerization injection nozzle core nozzle 23, from the fluid injection <br/> flow from the nucleus nozzle 23 from encircled nozzle 24 If the injection rod is inserted to a predetermined depth of the target ground while rotating the injection rod while injecting the fluid as a cavitation jet by injecting a low-pressure fluid jet, the surrounding soil is pierced and broken by the cavitation jet, and the rod 1 is Before the soil is inserted to the specified depth, the surrounding soil will be improved in advance.
【００２０】次いで、前記した硬化材のキャビテーショ
ン噴流により地盤注入を行えば、対象地盤は既に事前改
良されているので、キャビテーション噴流の効果を更に
高めることができる。Next, if the ground is injected by the above-mentioned hardening material cavitation jet, the effect of the cavitation jet can be further enhanced because the target ground has already been improved.
【００２１】このように造成される注入層Ｘは、必要に
応じてこれに隣接するX1の部分に同様の注入層を造成
し、次々に隣接させて所定形状に並列することにより、
所定の地盤硬化層を造成していくものである。The injection layer X thus formed is formed by forming a similar injection layer at a portion of X 1 adjacent to the injection layer X as needed, and adjoining the injection layers one after another in parallel with a predetermined shape.
A predetermined ground hardening layer is created.
【００２２】[0022]
【図１】本発明の実施例による施工状況を示す全体側面
図FIG. 1 is an overall side view showing a construction situation according to an embodiment of the present invention.
【図２】本発明の実施例による注入ロッド先端部の要部
構造を示す縦断拡大側面図FIG. 2 is an enlarged vertical cross-sectional side view showing the main structure of the tip of the injection rod according to the embodiment of the present invention.
【図３】本発明の他の実施例による２段重合噴射ノズル
を設けた注入ロッド先端部の要部構造を示す縦断拡大側
面図FIG. 3 is an enlarged vertical cross-sectional side view showing a main structure of a tip portion of an injection rod provided with a two-stage overlapping injection nozzle according to another embodiment of the present invention.
１ 注入ロッド 11 その１流路 12 その２流路 13 その３流路 14 その４流路 21 硬化材高圧噴流噴射ノズル 22 硬化材低圧噴流噴射ノズル 23 流体高圧噴流噴射ノズル 24 流体低圧噴流噴射ノズル ３ スイベル 31、32、33、34 硬化材圧送ホース ４ 基台 ５ 注入ロッド作動機構 ６ 注入ロッド転向機構 Ｇ 対象地盤 Ｘ 硬化材注入層 X1 硬化材注入層造成予定地盤 Ｙ パッキング噴流によるバリア部1 Injection Rod 11 1st Flow Path 12 2nd Flow Path 13 3rd Flow Path 14 4th Flow Path 21 Hardening Material High Pressure Jet Injection Nozzle 22 Hardening Material Low Pressure Jet Injection Nozzle 23 Fluid High Pressure Jet Injection Nozzle 24 Fluid Low Pressure Jet Injection Nozzle 3 Swivel 31, 32, 33, 34 Curing material pressure supply hose 4 Base 5 Injection rod actuating mechanism 6 Injection rod turning mechanism G Target ground X Curing material pouring layer X 1 Curing material pouring layer construction ground Y Barrier part by packing jet
Claims (4)
注入ロッドを対象地盤の所定深度まで挿入し、重合噴射
ノズルの核ノズルから高圧による硬化材噴流、囲周ノズ
ルから核ノズルからの硬化材噴流より低圧の硬化材噴流
を噴射して、両噴流の境界に相対速度差による渦流を発
生させることにより硬化材をキャビテーション噴流とし
て噴射しながら、注入ロッドを回動させつつ後退させる
ことにより、対象地盤中に硬化材を注入することを特徴
とするキャビテーション噴流による地盤硬化層造成工法1. An injection rod provided with a superposition injection nozzle on the side wall of the tip is inserted to a predetermined depth of the target ground, and a hardening material jet by high pressure from the core nozzle of the superposition injection nozzle and hardening from the peripheral nozzle from the peripheral nozzle. By injecting a hardening material jet having a pressure lower than that of the material jet and generating a vortex flow due to a relative velocity difference at the boundary between the two jets, the hardening material is jetted as a cavitation jet, and by retreating while rotating the injection rod, Ground hardening layer construction method by cavitation jet characterized by injecting hardening material into target ground
注入ロッドを対象地盤の所定深度まで挿入し、重合噴射
ノズルの核ノズルから高圧による硬化材Ａ液噴流、囲周
ノズルから核ノズルからの硬化材Ａ液噴流より低圧の硬
化材Ｂ液噴流を噴射して、両噴流の境界に相対速度差に
よる渦流を発生させることにより硬化材Ａ液とＢ液をキ
ャビテーション混合噴流として噴射しながら注入ロッド
を回動させつつ後退させることにより、対象地盤中に瞬
結性硬化材を混合注入することを特徴とするキャビテー
ション噴流による地盤硬化層造成工法2. An injection rod provided with a superposition injection nozzle on the side wall of the tip is inserted to a predetermined depth of the target ground, and a hardening material A liquid jet by high pressure from the core nozzle of the superposition injection nozzle and from the surrounding nozzle to the core nozzle. Injecting the hardening material A liquid and the liquid B as a cavitation mixed jet by injecting a hardening material B liquid jet having a pressure lower than that of the hardening material A jet, and generating a swirl due to the relative velocity difference at the boundary of both jets. Ground hardening layer construction method by cavitation jet characterized by mixing and injecting the instantaneous hardening material into the target ground by rotating and retracting the rod
その上部に所定間隔を置いて更に重合噴射ノズルを設け
た注入ロッドを対象地盤の所定深度まで挿入し、重合噴
射ノズルの核ノズルから高圧による硬化材噴流、囲周ノ
ズルから核ノズルからの硬化材噴流より低圧の硬化材噴
流を噴射して、両噴流の境界に相対速度差による渦流を
発生させることにより硬化材をキャビテーション噴流と
して噴射すると共に、上部重合噴射ノズルの核ノズルか
ら高圧による流体噴流、囲周ノズルから核ノズルからの
流体噴流より低圧の流体噴流を噴射して、両噴流の境界
に相対速度差による渦流を発生させることにより、流体
をキャビテーション噴流として噴射しながら注入ロッド
を回動させつつ後退させることにより、対象地盤中に硬
化材を注入することを特徴とする請求項１又は請求項２
記載のキャビテーション噴流による地盤硬化層造成工法3. A superposition injection nozzle is provided on the side wall of the tip portion,
Inserting an injection rod with a superposition injection nozzle at a predetermined interval above it to a predetermined depth of the target ground, a high-pressure hardening material jet from the core nozzle of the superposition injection nozzle, and a hardening material from the surrounding nozzle to the core nozzle By injecting a hardening material jet at a lower pressure than the jet, and by generating a vortex flow due to the relative velocity difference at the boundary of both jets, the hardening material is jetted as a cavitation jet, and at the same time, a high pressure fluid jet from the core nozzle of the upper superposition injection nozzle, From the surrounding nozzle to the nuclear nozzle
And ejecting a fluid jet of low pressure from the fluid jet, by generating an eddy flow due to the relative velocity difference in the boundary of both the jet, by retracting while rotating the injection rod while injecting the fluid cavitation jet, target ground 3. A hardening material is injected into the inside of the housing.
Ground hardening layer construction method using the described cavitation jet
による流体噴流、囲周ノズルから核ノズルからの流体噴
流より低圧の流体噴流を噴射して、両噴流の境界に相対
速度差による渦流を発生させることにより、流体をキャ
ビテーション噴流として噴射しながら、注入ロッドを回
動させつつ注入ロッドを対象地盤の所定深度まで挿入し
て、注入ロッド挿入時に対象地盤を事前改良するように
して硬化材注入を行うようにした請求項３記載のキャビ
テーション噴流による地盤硬化層造成工法4. A fluid jet by the high-pressure from the nucleus nozzles of the upper polymerization injection nozzle, by ejecting low-pressure fluid jet from the fluid injection <br/> flow from the nucleus nozzle from encircled nozzle, relative velocity at the boundary of the two jets by generating an eddy flow due to the difference, while spraying a fluid as a cavitation jet, the injection rod by inserting an injection rod while rotating to a predetermined depth of the target ground, so as to advance improve target ground upon injection rod inserted A method for forming a ground hardening layer by a cavitation jet according to claim 3, wherein the hardening material is injected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31755297A JP3376261B2 (en) | 1997-11-19 | 1997-11-19 | Soil hardened layer formation method by cavitation jet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31755297A JP3376261B2 (en) | 1997-11-19 | 1997-11-19 | Soil hardened layer formation method by cavitation jet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11152738A JPH11152738A (en) | 1999-06-08 |
| JP3376261B2 true JP3376261B2 (en) | 2003-02-10 |
Family
ID=18089537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31755297A Expired - Fee Related JP3376261B2 (en) | 1997-11-19 | 1997-11-19 | Soil hardened layer formation method by cavitation jet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3376261B2 (en) |
-
1997
- 1997-11-19 JP JP31755297A patent/JP3376261B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11152738A (en) | 1999-06-08 |
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