JP4944926B2 - Ground hardening layer construction method and its equipment - Google Patents

Ground hardening layer construction method and its equipment Download PDF

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JP4944926B2
JP4944926B2 JP2009139755A JP2009139755A JP4944926B2 JP 4944926 B2 JP4944926 B2 JP 4944926B2 JP 2009139755 A JP2009139755 A JP 2009139755A JP 2009139755 A JP2009139755 A JP 2009139755A JP 4944926 B2 JP4944926 B2 JP 4944926B2
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injection
nozzle
stirring
ground
blade
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JP2010285788A (en
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法夫 田中
康晴 中西
博文 牧薗
賢 野田
晋一 深田
天士 市坪
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フローテクノ株式会社
株式会社エヌ・アイ・ティ
株式会社富士建
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Description

本発明は、十文字方向に伸びる攪拌翼を２段に設け、上段の攪拌翼に下方に噴射する噴射ノズルを設けた注入ロッドを対象地盤に挿入し、噴射ノズルから地盤改良材を噴射しつつ、注入ロッドを回動上下動させることにより対象地盤中に地盤硬化層を造成する地盤硬化層造成工法とその装置に関するものである。   The present invention is provided with two stages of stirring blades extending in a cross-shaped direction, and an injection rod provided with an injection nozzle that injects downward into the upper stirring blade is inserted into the target ground, while spraying the ground improvement material from the injection nozzle, The present invention relates to a ground hardened layer construction method and an apparatus for creating a ground hardened layer in a target ground by rotating an injection rod up and down.

従来、軟弱地盤の構築基礎支保や強化支保については、地盤硬化材を高圧噴射しながら地盤硬化材注入ロッドを回動することにより対象地盤を攪拌掘削する地盤硬化材注入工法が多く行われてきたが、施工環境や地盤の軟弱度によっては、効率が悪く攪拌力も不充分であるという問題があった。   Conventionally, for foundation support and reinforcement support for soft ground, there have been many ground hardening material injection methods for stirring and excavating the target ground by rotating the ground hardening material injection rod while jetting the ground hardening material at high pressure. However, depending on the construction environment and the softness of the ground, there is a problem that the efficiency is poor and the stirring force is insufficient.

これに対応して、攪拌翼による直接的攪拌が行われるようになり、更に、硬化材注入層の径を大きくするために、例えば特許文献１に示されるように、攪拌翼の先端に噴射ノズルを設けて水平方向に硬化材を噴射するなど攪拌翼に噴射ノズルを設定することも行われるようになってきた。   Correspondingly, direct stirring by a stirring blade is performed, and in order to increase the diameter of the hardened material injection layer, as shown in Patent Document 1, for example, an injection nozzle is provided at the tip of the stirring blade. An injection nozzle has also been set on the stirring blade, for example, by providing a stirrer in the horizontal direction.

しかし、従来の硬化材噴射が水平方向への噴射を主流としたため、攪拌翼による直接攪拌と硬化材噴流による流体攪拌との調整に問題があり、攪拌領域に硬化材が充分にいきわたらず、土壌と硬化材の混合むらが発生し易く確実かつ均一な土壌の攪拌混合には更なる問題を残していた。   However, since the conventional curing material injection is mainly in the horizontal direction, there is a problem in the adjustment of the direct stirring by the stirring blade and the fluid stirring by the curing material jet, the curing material does not spread sufficiently in the stirring area, Uneven mixing of the soil and the hardener is likely to occur, and a further problem remains in the reliable and uniform stirring and mixing of the soil.

このような混合むらの問題に対応するため、地盤改良材と軟弱土壌の攪拌手段としては、例えば特許文献２に示されるように、注入ロッドに斜め下方乃至斜め上方に噴射する噴射ノズルを設け、噴流を交差させて立体的な噴流攪拌注入を行うと共に、その上部に設けた攪拌翼によって更なる直接攪拌を行う工法や装置も提案されてきている。   In order to cope with such a problem of unevenness in mixing, as a means for stirring the ground improvement material and the soft soil, for example, as shown in Patent Document 2, an injection nozzle that injects obliquely downward to obliquely upward is provided on the injection rod, A method and apparatus have also been proposed in which three-dimensional jet stirring and injection is performed by intersecting jets, and further direct stirring is performed by a stirring blade provided on the top.

また、注入された硬化材が過剰な攪拌や切削水の使用により、流出希釈されることを防止するため、特許文献３に示されるように攪拌翼の先端に拡散防止板を設定したり、特許文献４のように注入ロッドの斜め方向に噴射する噴射ノズルを設けて、同噴射ノズルから攪拌翼の先端に向けて硬化材を噴射することも提案されている。
特開昭５０−１０７７１４号公報 特開平６−１４６２６０号公報 特開平９−２９６４３９号公報 特開２００５−７６２１２号公報 In addition, in order to prevent the injected hardened material from being diluted outflow due to excessive stirring or use of cutting water, a diffusion prevention plate is set at the tip of the stirring blade as shown in Patent Document 3, It has also been proposed to provide an injection nozzle that injects in an oblique direction of the injection rod as in Literature 4, and to inject the curing material from the injection nozzle toward the tip of the stirring blade.
JP 50-107714 A JP-A-6-146260 Japanese Patent Laid-Open No. 9-296439 JP-A-2005-76212

攪拌翼によって直接攪拌を行う場合には、注入ロッドの回動に対して掛かる地盤の抵抗によって発生する回転トルクの増大が問題であり、作業効率に大きく影響している。しかし、上記先行技術の場合、攪拌翼の先端に拡散防止板を設定すれば、注入ロッドを回転するための回転トルクが増大するし、注入ロッド側壁に設けた噴射ノズルからの攪拌翼の下部若しくは上部に向けた硬化材噴射では回転トルク増大に対応することは困難である。   When stirring directly with a stirring blade, an increase in rotational torque generated by the resistance of the ground applied to the rotation of the injection rod is a problem, which greatly affects work efficiency. However, in the case of the above prior art, if a diffusion prevention plate is set at the tip of the stirring blade, the rotational torque for rotating the injection rod increases, and the lower portion of the stirring blade from the injection nozzle provided on the injection rod side wall or It is difficult to cope with the increase in rotational torque by the injection of the hardener toward the top.

また、中圧噴射機械攪拌工法（ＣＭＳシステム）として用いられている掘進時と引き上げ時に下段攪拌翼の取り付け基部より水平方向に噴射する方法では、φ１４００以上の大口径の場合に翼の先端部までで噴射エネルギーが減衰し機械の回転トルク低減効果が低くなるという問題がある。   Also, in the method of injecting horizontally from the mounting base of the lower stirrer blade during excavation and lifting, which is used as a medium pressure injection mechanical stirring method (CMS system), the tip of the blade is reached when the diameter is larger than φ1400 Therefore, there is a problem that the injection energy is attenuated and the effect of reducing the rotational torque of the machine is lowered.

更に、φ１４００以上の大口径の場合には、大型の装置を用いても対象地盤の状況によっては硬化材が改良口径の外周部まで到達せず、造成された地盤硬化層外周部に硬化不良が発生する危険があり、攪拌土壌と硬化材の混合むらも生じ易いという問題がある。   Furthermore, in the case of a large diameter of φ1400 or more, even if a large apparatus is used, the hardened material does not reach the outer peripheral part of the improved diameter depending on the condition of the target ground, and there is a hardening failure in the outer peripheral part of the formed ground hardened layer. There is a problem that there is a risk of occurrence, and uneven mixing of the agitated soil and the hardener is likely to occur.

本発明は上記した課題に対応しようとするものであり、上段攪拌翼の翼腹部に設けた噴射ノズルから地盤硬化材を垂直下方向若しくは斜め下方向に向けて噴射することで、下段攪拌翼が切削する対象地盤を確実に掘削破砕し回転トルクを大幅に低減するようにした。   The present invention is intended to address the above-described problem, and the lower stirrer blade is obtained by spraying the ground hardening material vertically or obliquely downward from an injection nozzle provided on the blade abdomen of the upper stirrer blade. The target ground to be cut is reliably excavated and crushed to greatly reduce the rotational torque.

また、上記下方噴射のノズル位置を、一方を攪拌翼の先端側、他方を基部側にずらせて設定し、ロッドが回動することにより噴射軌跡が二重円を描いて下方地盤を切削してより広範囲の土壌が掘削破砕されるように構成する。   In addition, the nozzle position for the lower injection is set by shifting one side to the tip side of the stirring blade and the other side to the base side, and the rod is rotated so that the injection locus draws a double circle to cut the lower ground. It is configured so that a wider range of soil is excavated and crushed.

更に、下段攪拌翼の取り付け基部からも硬化材を攪拌翼に沿って水平方向に噴射することにより、掘削噴射流の方向が交錯して粘性地盤での共回り防止を行うと共に地盤の破砕力と硬化材噴流の到達距離も伸長するので、これまで小型機械では不可能であった大口径の地盤改良も施工可能とした。   Furthermore, by injecting the hardener horizontally from the mounting base of the lower stirrer blades along the stirrer blades, the directions of excavation jets are mixed to prevent co-rotation in the viscous ground and the ground crushing force and Since the reach of the hardener jet has also been extended, it has become possible to implement large-diameter ground improvements that were previously impossible with small machines.

このように、上段攪拌翼からの下方噴射と下段攪拌翼の取り付け基部からの水平方向噴射の協働噴射をφ１２００以下の攪拌翼に用いることにより土壌の掘削破砕力が飛躍的に強化され、Ｎ値１５以上の硬質地盤での施工を可能とし、攪拌混合効果も高めることができた。   In this way, by using cooperative injection of the lower injection from the upper stirring blade and the horizontal injection from the mounting base of the lower stirring blade for the stirring blade of φ1200 or less, the excavation and crushing force of the soil is remarkably enhanced. Construction on hard ground with a value of 15 or more was made possible, and the stirring and mixing effect could be enhanced.

本発明は、以上のように構成したことにより、攪拌注入ロッドの地盤中における回転トルクを大幅に低減でき、土壌の掘削破砕力強化、広範囲土壌の掘削破砕、更には硬化材噴流到達距離の伸長や攪拌混合効果を高めることができたものであり、これを基礎に施工目的に応じて硬化材の噴射吐出量、噴射圧力、噴射部位、噴射角度を変化させることにより様々な施工効果を期することができる。   Since the present invention is configured as described above, the rotational torque in the ground of the stirring injection rod can be greatly reduced, the excavation and crushing force of the soil is increased, the excavation and crushing of a wide range of soil, and further the extension of the reach of the hardener jet flow Based on this, various construction effects can be expected by changing the ejection amount, injection pressure, injection site, and injection angle of the curing material according to the purpose of construction. be able to.

本発明の実施例を示すもので、攪拌注入ロッドを対象地盤に挿入して地盤硬化層を造成する施工状况を示す装置全体の斜視図The perspective view of the whole apparatus which shows the Example of this invention and shows the construction state flaw which inserts a stirring injection | pouring rod into object ground and creates a ground hardening layer 同じく、上段攪拌翼の噴射ノズルからの下方噴射と共に、下段攪拌翼の取り付け基部から攪拌翼に沿って水平方向に噴射する状況を示す攪拌注入ロッド先端モニター部の拡大斜視図Similarly, an enlarged perspective view of the stirring injection rod tip monitor unit showing a state in which the lower stage stirring blade is jetted in the horizontal direction along the stirring blade along with the lower jet from the jet nozzle of the upper stage stirring blade. 同じく、攪拌注入ロッドへの上下攪拌翼の取り付け状況と噴射ノズル及び硬化材流路の状况を示す先端モニター部の拡大側面図Similarly, an enlarged side view of the tip monitor section showing the state of attachment of the upper and lower stirring blades to the stirring injection rod and the state of the injection nozzle and the curing material channel 同じく、攪拌注入ロッドの先端モニター部の拡大底面図Similarly, enlarged bottom view of the tip monitoring part of the stirring injection rod 同じく、上段攪拌翼の翼腹に設定した外側傾斜ノズルからの斜め下方噴射と共に、下段攪拌翼の取り付け基部から各攪拌翼に沿って水平方向に噴射する状況を、上段攪拌翼と下段攪拌翼を伸長方向を捨象して上下に並べて各噴射ノズルの位置と噴射方向を平面模式的に示した攪拌注入ロッド先端モニター部の拡大縦断面側面図Similarly, in addition to the obliquely downward injection from the outer inclined nozzle set on the blades of the upper stirring blades, the situation where the upper stirring blades and the lower stirring blades are injected horizontally from the mounting base of the lower stirring blades along the respective stirring blades. Enlarged vertical cross-sectional side view of the stirring injection rod tip monitor section showing the position and injection direction of each injection nozzle in a plan view, with the extension direction discarded. 同じく、攪拌注入ロッドの対象地盤への挿入下降時の状況を示す施工状況の縦断面側面図Similarly, a vertical cross-sectional side view of the construction status showing the situation when the stirring injection rod is inserted and lowered into the target ground 同じく、攪拌注入ロッドの上昇工程における拡径噴射の状況を示す施工状況の縦断面側面図Similarly, a longitudinal sectional side view of the construction status showing the status of the diameter expansion injection in the ascending process of the stirring injection rod 同じく、攪拌注入ロッドの上昇工程における拡径噴射により造成硬化層の基根部を拡径させた状況を示す施工状況の縦断面側面図Similarly, a longitudinal cross-sectional side view of the construction situation showing the situation in which the diameter of the root portion of the hardened layer is expanded by the diameter expansion injection in the ascending injection rod raising process

以下、図面に基づいて本発明の実施の形態を説明する。１は攪拌注入ロッドで、先端モニター部Ｍに上段攪拌翼１１Ａ、１１Ｂが左右に張り出して設定され、その下部に所定の間隔を置いて下段攪拌翼１２Ａ、１２Ｂが上段攪拌翼と十文字状に交差して設定されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a stirring injection rod. Upper stirring blades 11A and 11B are set to protrude from the left and right at the tip monitoring portion M, and the lower stirring blades 12A and 12B intersect with the upper stirring blade in a cross shape at a predetermined interval below the upper stirring blade 11A. Is set.

上段攪拌翼１１Ａ、１１Ｂにはロッド１に設けられた硬化材圧送路２から分岐して翼先端側に延びる噴射流路２１が設けられ、翼腹には噴射流路２１から連通する下方噴射ノズル２２ａ、２２ｂが開口する。下方噴射ノズル２２ａ、２２ｂは所定の間隔を置いて複数の予備ノズル孔２２ｃを穿設し、施工条件に応じて位置を選択して作動させるノズル孔にはノズルチップ２３を嵌合し、使用しないノズル孔にはカバーチップ２４を嵌入して閉塞するようにすれば、施工条件に対して弾力的に対応することができる。   The upper stirrer blades 11A and 11B are provided with an injection passage 21 that branches from the hardened material pumping passage 2 provided on the rod 1 and extends toward the tip of the blade. 22a and 22b are opened. The lower injection nozzles 22a and 22b are provided with a plurality of preliminary nozzle holes 22c at a predetermined interval, and the nozzle tip 23 is fitted into the nozzle hole that is operated by selecting the position according to the construction conditions, and is not used. If the cover chip 24 is fitted and closed in the nozzle hole, it is possible to flexibly cope with the construction conditions.

下段攪拌翼１２Ａ、１２Ｂは上段攪拌翼１１から３００ｍｍ程度の間隔をおいてロッド１に対して捻り傾斜をもって植設され、下面側一側にカッタービット３を装備すると共に、ロッド１の下段攪拌翼１２Ａの取り付け基部上部に水平方向噴射ノズル３１ａが攪拌翼の先端に向け攪拌翼に沿って設定される。   The lower stirring blades 12A and 12B are planted with a torsional inclination with respect to the rod 1 at an interval of about 300 mm from the upper stirring blade 11 and equipped with a cutter bit 3 on one side of the lower surface side. A horizontal injection nozzle 31a is set along the stirring blade toward the tip of the stirring blade at the upper part of the attachment base of 12A.

更に、攪拌翼１２Ｂの取り付け基部下部に水平方向噴射ノズル３１ｂが攪拌翼の先端に向け攪拌翼に沿って設定され、下段攪拌翼の上面と下面に硬化材噴流が衝接誘導されて飛翔距離が伸長されると共に翼表面と攪拌土砂との衝合抵抗を緩衝して攪拌翼の攪拌混合力を高めるように構成されている。
なお、３１ｃは予備ノズル孔であり、前記下方噴射ノズルの場合と同様に施工条件に応じて位置を選択できるようにしているものである。 Further, a horizontal injection nozzle 31b is set along the stirring blade toward the tip of the stirring blade at the lower portion of the mounting base of the stirring blade 12B, and a hardener jet is abutted against the upper and lower surfaces of the lower stirring blade, resulting in a flight distance. It is configured to elongate and buffer the collision resistance between the blade surface and the stirring earth and sand to increase the stirring and mixing force of the stirring blade.
In addition, 31c is a preliminary | backup nozzle hole, The position can be selected according to construction conditions similarly to the case of the said downward injection nozzle.

攪拌注入ロッド１は、先端部に以上のように構成された上段攪拌翼１１と下段攪拌翼１２を備え、先端に掘削刃１３を設定したモニター部Ｍを装着してクロージョイントにより延長接合可能なロッドによって構成される。
また、ノズル孔２２、３１について予備ノズル孔のうちから位置を選択して嵌合するノズルチップ２３については、ストレート方向のもののほかチップ内において噴射方向に角度付けを行い、チップの嵌入によって噴射ノズルの噴射方向を調整できるように複数種のノズルチップ２３が用意されている。 The stirring injection rod 1 includes the upper stirring blade 11 and the lower stirring blade 12 configured as described above at the tip portion, and can be extendedly joined by a claw joint by attaching a monitor portion M having a drilling blade 13 at the tip. Consists of rods.
Further, the nozzle tip 23 for selecting and fitting the position of the nozzle holes 22 and 31 from the spare nozzle holes is angled in the injection direction in the tip in addition to the straight direction, and the injection nozzle is inserted by inserting the tip. A plurality of types of nozzle tips 23 are prepared so that the injection direction of the nozzles can be adjusted.

後端はスイベル１４を介して硬化材プラントに連絡する硬化材供給ホース２５と連結し、これを通じて硬化材プラントにおいて調製され供給されるスラリー状硬化材を受けて硬化材圧送流路２により、上段攪拌翼１１Ａ、１１Ｂに開口する下方噴射ノズル２２ａ、２２ｂ、更に、下段攪拌翼１２Ａの取り付け基部上部の水平方向噴射ノズル３１ａ、同１２Ｂ取り付け基部下部の水平方向噴射ノズル３１ｂに圧送し、各ノズルから前記形態で対象地盤Ｇ中に噴射される。   The rear end is connected to a curing material supply hose 25 connected to the curing material plant via the swivel 14, and receives the slurry-like curing material prepared and supplied in the curing material plant through this, and the upper stage is supplied by the curing material pumping flow path 2. The lower injection nozzles 22a and 22b that open to the stirring blades 11A and 11B, the horizontal injection nozzle 31a at the upper part of the attachment base of the lower stirring blade 12A, and the horizontal injection nozzle 31b at the lower part of the attachment base of the 12B are pressure-fed. It is injected into the target ground G in the form.

１５は攪拌注入ロッド１の昇降駆動をリードする主軸リーダーで、施工地盤上に据え付けた母機、リーダーマシン１７によって据え付け支持されると共に、攪拌注入ロッド１を回動可能に包持して昇降駆動を主軸として主導し、回転駆動機構１６によってロッド１に回転駆動を与えるものである。   15 is a spindle leader that leads the raising and lowering drive of the stirring injection rod 1 and is supported by the mother machine and the leader machine 17 installed on the construction ground, and the raising and lowering drive is carried by holding the stirring injection rod 1 rotatably. It takes the lead as a main shaft and gives the rod 1 rotational drive by the rotational drive mechanism 16.

以上のように構成した攪拌注入ロッド１を回転駆動させながら、硬化材プラントから硬化材を圧送すれば硬化材は圧送流路２を通じて下方噴射ノズル２２ａ、２２ｂ、更に、水平方向噴射ノズル３１ａ、３１ｂに至り対象地盤中に噴射されるが、下方噴射ノズル２２ａからの噴流は下段攪拌翼１２Ａが回動する直前の地盤を下方或いは斜め下方に穿孔破砕し外周部円周状に破砕軌跡Ｒを描いて地盤を切削して行く。   If the hardened material is pumped from the hardener plant while rotating the stirring / injecting rod 1 configured as described above, the hardened material passes through the pumping flow path 2 so that the lower jet nozzles 22a and 22b, and further the horizontal jet nozzles 31a and 31b. However, the jet flow from the lower injection nozzle 22a drills and crushes the ground immediately before the lower stirring blade 12A rotates downward or obliquely downward, and draws a crushing trajectory R around the outer circumference. Then cut the ground.

この破砕軌跡の直後に下段攪拌翼１２Ａのカッタービット３が回動削入し、更に、下段攪拌翼１２Ｂの回動直前地盤を下方或いは斜め下方に噴射ノズル２２ｂからの噴流が穿孔破砕し、内周部円周状に破砕軌跡Ｒｓを描き、直後に下段攪拌翼１２Ｂのカッタービット３が回動削入する。   Immediately after this crushing trajectory, the cutter bit 3 of the lower agitating blade 12A turns and cuts, and further, the jet flow from the injection nozzle 22b perforates and crushes the ground just before the lower agitating blade 12B rotates downward or obliquely, The crushing trajectory Rs is drawn in a circumferential shape, and immediately after that, the cutter bit 3 of the lower stirring blade 12B is rotationally cut.

上記上段攪拌翼１１からの下方噴射と同時に下段攪拌翼１２の取り付け基部に設定された水平方向噴射ノズル３１ａ、３１ｂからの硬化材噴射が行なわれるが、ノズル３１ａは攪拌翼１２Ａの取り付け基部上部から翼先端に照準を合わせ、攪拌翼の上面に沿ってやや斜めに噴流が衝接誘導され翼面にこびり着く粘性土等を弾くと共に翼面に誘導されて飛翔距離が伸長される。   Simultaneously with the downward injection from the upper stirring blade 11, the curing material injection from the horizontal injection nozzles 31 a and 31 b set to the mounting base of the lower stirring blade 12 is performed. The nozzle 31 a is injected from the upper portion of the mounting base of the stirring blade 12 A. Aiming at the tip of the blade, the jet is a little slanted along the upper surface of the agitating blade, repels the viscous soil that sticks to the blade surface, and is guided to the blade surface to extend the flight distance.

ノズル３１ｂは攪拌翼１２Ｂの取り付け基部下部から翼先端に照準を合わせ、攪拌翼の下面に噴流が衝接誘導され翼面にこびり着く粘性土等を弾くと共に翼面に誘導されて飛翔距離が伸長される。このようにノズル２２ａ、２２ｂ、３１ａ、３１ｂは互いに衝合することなく多面的に対象地盤を穿孔破砕し、これと連携して攪拌翼が土壌を攪拌混合するので、攪拌注入ロッドの地盤中における回転トルクを大幅に低減でき、ロッド１を円滑に下降挿入できるものである。   The nozzle 31b is aimed at the blade tip from the lower part of the mounting base of the stirring blade 12B, and the jet flow is guided to the lower surface of the stirring blade and repels the viscous soil that sticks to the blade surface. It is stretched. In this way, the nozzles 22a, 22b, 31a, 31b perforate and crush the target ground in a multifaceted manner without colliding with each other, and the stirring blades stir and mix the soil in cooperation with this, so in the ground of the stirring injection rod The rotational torque can be greatly reduced, and the rod 1 can be smoothly lowered and inserted.

所定の深度に達したところで、ロッド１の回転方向を変え下降時の回転に対して逆回転させながら、再び、硬化材を噴射しながらロッドの上昇引上げを行なって対象地盤中に円柱状の地盤硬化層Ｗを造成し、軟弱地盤の構築基礎支保や強化支保を行なうものであるが、ロッド下降時と上昇引上げ時で作動態様を変化させたり、硬化材圧送条件を変化させるか否かは、施工目的と環境条件によるものである。   When the predetermined depth is reached, the rod 1 is rotated in the reverse direction with respect to the rotation at the time of lowering, and the rod is lifted and pulled up again while injecting the hardener, so that the cylindrical ground in the target ground The hardened layer W is created, and the foundation support and reinforcement support of the soft ground are performed, but whether to change the operation mode at the time of lowering the rod and at the time of raising and lowering, or whether to change the hardened material pumping condition, It depends on the construction purpose and environmental conditions.

通常施工の場合、例えば、攪拌注入ロッドの対象地盤への挿入下降時に上段攪拌翼ノズルから５〜１５Ｍｐａの噴射圧力で硬化材としてセメントミルクを吐出量１００リッター／ｍｉｎで噴射しながら３０〜５０ｒｐｍで回転させることで、ロッド下降時における回転トルクが減少し、上昇時には更にセメントミルクを噴射圧力１０〜３０Ｍｐａ、吐出量１５０リッター／ｍｉｎで噴射しながら１０〜３０ｒｐｍで回転させることで、攪拌翼径φ１０００の攪拌注入ロッドによりφ１２００の拡径層が造成できた。   In the case of normal construction, for example, at the time of insertion and descent of the stirring injection rod into the target ground, the cement milk is injected at a discharge rate of 100 liter / min from the upper stirring blade nozzle at a spraying pressure of 5 to 15 Mpa at a discharge rate of 100 liters / min. By rotating, the rotational torque at the time of lowering of the rod is reduced, and at the time of rising, the cement milk is further rotated at 10 to 30 rpm while being injected at an injection pressure of 10 to 30 Mpa and a discharge amount of 150 liter / min. A diameter-enlarging layer of φ1200 could be formed with the stirring and injection rod.

この場合のφ１０００の基準径層造成については、セメントミルクの噴射圧力５〜１５ＭＰａ、吐出量１００リッター／ｍｉｎで噴射しながら３０〜５０ｒｐｍでの回転によっている。   In this case, the standard diameter layer of φ1000 is rotated at 30 to 50 rpm while being injected at a cement milk injection pressure of 5 to 15 MPa and a discharge amount of 100 liters / min.

実施例２は図８に示すように下降挿入から引上げ上昇に移る際に、下降挿入時の上段攪拌翼ノズルからの硬化材噴射圧力を５〜１５Ｍｐａとし、吐出量１００リッター／ｍｉｎで噴射しながら３０〜５０ｒｐｍで回転し、引上げ上昇時に所定長さだけ噴射圧力１０〜３０Ｍｐａ、吐出量１５０リッター／ｍｉｎで噴射しながら１０〜３０ｒｐｍで回転させ、その上方では、再び、噴射圧力を５〜１５Ｍｐａとし、吐出量１００リッター／ｍｉｎで噴射しながら３０〜５０ｒｐｍで回転させることにより、基根部を表面層の硬化層より大径のものとして構築基礎造成を行うようにした。   In Example 2, as shown in FIG. 8, when moving from the downward insertion to the pulling upward, the curing material injection pressure from the upper stirrer blade nozzle at the time of downward insertion is set to 5 to 15 MPa, while the discharge amount is being injected at 100 liters / min. Rotate at 30-50 rpm, rotate at a speed of 10-30 Mpa while injecting at a predetermined length of 10-30 Mpa and a discharge rate of 150 liters / min at the time of pulling up, and above that, the injection pressure is again 5-15 Mpa The foundation was constructed with a base having a larger diameter than the hardened layer of the surface layer by rotating at 30-50 rpm while spraying at a discharge rate of 100 liters / min.

また、上記拡径部の造成については、基根部だけでなく所定間隔毎に拡径して竹節状の硬化層に造成することもできる。更に、拡径部の造成については噴射圧力を増大する手段のほか前記したノズルチップ２３に角度付けした噴射孔を穿設して上段攪拌翼の下方噴射を攪拌翼の外側に向けて噴射されるように設定し、台形斜辺状の噴流軌跡が硬化材注入層Ｗを大径に形成するように構成することもできる。   Moreover, about creation of the said enlarged diameter part, not only a base root part but a diameter can be expanded for every predetermined space | interval, and it can also produce in a bamboo-node-shaped hardened layer. In addition to the means for increasing the injection pressure, in addition to the means for increasing the injection pressure, the nozzle tip 23 is provided with an angled injection hole so that the lower injection of the upper stirring blade is directed toward the outside of the stirring blade. The trapezoid hypotenuse jet trajectory can be configured to form the hardener injection layer W with a large diameter.

本発明に係る地盤硬化層造成工法とその装置は、上記のように攪拌翼による物理的攪拌を多面的な非交差噴流の組合せによる複合攪拌により切削土壌と硬化材の極めて混合度の高い均質な改良混合層の造成を可能としたもので、軟弱地盤の効率的強化により軟弱な地質のため利用できなかった土地の活用を積極的に押し進めることに利用することができる。   The ground hardened layer construction method and the apparatus according to the present invention are as described above, and the mechanical stirring by the stirring blade is combined with the multi-faceted non-crossing jet combined stirring, so that the cutting soil and the hardened material are highly mixed and homogeneous. It is possible to create an improved mixed layer, and it can be used to actively promote the use of land that could not be used due to the weak geology by the efficient strengthening of soft ground.

１ 攪拌注入ロッド
１１Ａ 上段攪拌翼
１１Ｂ 上段攪拌翼
１２Ａ 下段攪拌翼
１２Ｂ 下段攪拌翼
１３ モニター部先端の掘削刃
１４ スイベル
１５ 主軸リーダー
１６ ロッドの回転駆動機構
１７ リーダーマシン
２ 硬化材圧送路
２１ 噴射流路
２２ａ 上段攪拌翼１１Ａの下方噴射ノズル
２２ｂ 上段攪拌翼１１Ｂの下方噴射ノズル
２２ｃ 下方噴射ノズルの予備ノズル孔
２３ ノズルチップ
２４ カバーチップ
２５ 硬化材供給ホース
３ カッタービット
３１ａ 下段攪拌翼１２Ａの水平方向噴射ノズル
３１ｂ 下段攪拌翼１２Ｂの水平方向噴射ノズル
３１ｃ 水平方向噴射ノズルの予備ノズル孔
Ｇ 対象地盤
Ｍ ロッド先端のモニター部
Ｒ 外周部円周状破砕軌跡
Ｒｓ 内周部円周状破砕軌跡
Ｗ 造成硬化材層 DESCRIPTION OF SYMBOLS 1 Stirring injection rod 11A Upper stirrer blade 11B Upper stirrer blade 12A Lower stirrer blade 12B Lower stirrer blade 13 Excavation blade 14 at the tip of the monitor part Swivel 15 Spindle leader 16 Rod rotation drive mechanism 17 Leader machine 2 Curing material pressure feed path 21 Injection flow path 22a Lower injection nozzle 22b of upper stirring blade 11A Lower injection nozzle 22c of upper stirring blade 11B Preliminary nozzle hole 23 of lower injection nozzle Nozzle tip 24 Cover chip 25 Curing material supply hose 3 Cutter bit 31a Horizontal injection nozzle of lower stirring blade 12A 31b Horizontal injection nozzle 31c of lower stirring blade 12B Preliminary nozzle hole G of horizontal injection nozzle Target ground M Monitor section R of rod tip Outer circumferential crushing trajectory Rs Inner peripheral circumferential crushing trajectory W Preparation hardened material layer

Claims (7)

翼腹に下方噴射ノズルをそれぞれ設けて左右に伸びる上段攪拌翼と、その下部に所定間隔を開けて十字状に交差する下段攪拌翼を設け、一方の下段攪拌翼の取り付け基部上部、他方の下段攪拌翼の取り付け基部下部にそれぞれ水平方向噴射ノズルを設定した攪拌注入ロッドに硬化材を圧送して各ノズルより高圧噴射しながら攪拌注入ロッドを回転しつつ下降、上昇或いはその双方を行うようにしたことを特徴とする地盤硬化層造成工法   An upper agitating blade that extends from side to side with a lower injection nozzle on the flank, and a lower agitating blade that crosses in a cross shape at a predetermined interval are provided below the upper agitating blade. The stirrer blades are lowered and raised or both rotated while rotating the stirring injection rod while pumping the hardened material to the stirring injection rod set with the horizontal injection nozzle at the lower part of the base of the stirring blade and jetting high pressure from each nozzle. A ground hardened layer construction method characterized by 上段攪拌翼に設ける下方噴射ノズルの一方を同攪拌翼の先端側に、他方を基部側に設定するようにして、先端側下方噴射ノズル噴流が対象地盤の外周部を円周状に破砕し、基部側下方噴射ノズル噴流が対象地盤の内周部を円周状に破砕するように構成した請求項１記載の地盤硬化層造成工法   One of the lower injection nozzles provided on the upper stirring blade is set on the tip side of the stirring blade and the other is set on the base side, and the tip-side lower injection nozzle jet crushes the outer periphery of the target ground in a circular shape, The ground hardening layer creation method of Claim 1 comprised so that a base side downward injection nozzle jet might crush the inner peripheral part of object ground in the shape of a circumference. 上段攪拌翼に設ける下方噴射ノズルの双方を同攪拌翼の先端側に対象地盤の外周部に向けて傾斜設定し、同噴射ノズルからの噴流が攪拌翼の長さ範囲の外側に到達するようにした請求項１記載の地盤硬化層造成工法   Both of the lower injection nozzles provided on the upper stirring blade are inclined toward the outer periphery of the target ground at the tip side of the stirring blade so that the jet flow from the injection nozzle reaches the outside of the length range of the stirring blade. The ground hardened layer construction method according to claim 1 上段攪拌翼に設ける下方噴射ノズルの一方もしくは双方を同攪拌翼の先端側に対象地盤の外周部に向けて傾斜設定し、同噴射ノズルからの噴射圧力を制御することにより同噴射ノズルからの噴流到達距離を変化させ、大径部と小径部を有する地盤硬化層を造成するようにした請求項１記載の地盤硬化層造成工法   One or both of the lower injection nozzles provided on the upper stirring blades are inclined toward the outer periphery of the target ground at the tip side of the stirring blades, and the jet flow from the injection nozzles is controlled by controlling the injection pressure from the injection nozzles The ground hardened layer construction method according to claim 1, wherein a ground hardened layer having a large diameter portion and a small diameter portion is created by changing the reach distance. 翼腹に下方噴射ノズルをそれぞれ設けて左右に伸びる上段攪拌翼と、その下部に所定間隔を開けて十字状に交差する下段攪拌翼を設け、一方の下段攪拌翼の取り付け基部上部、他方の下段攪拌翼の取り付け基部下部にそれぞれ水平方向噴射ノズルを設定した攪拌注入ロッドを回転上下駆動機構によって支持して成る地盤硬化層造成装置   An upper agitating blade that extends from side to side with a lower injection nozzle on the flank, and a lower agitating blade that crosses in a cross shape at a predetermined interval are provided below the upper agitating blade. A ground hardening layer forming device comprising a stirring injection rod supported by a rotating vertical drive mechanism, each having a horizontal injection nozzle set at the lower part of the base of the stirring blade. 各噴射ノズルについて施工条件によって設定位置の変化が必要な部位に、複数のノズル孔を設け、施工環境に応じて選択したノズル孔にノズルチップを嵌入して噴射ノズルとすると共に、他のノズル孔はカバーチップを嵌入して閉塞するようにした請求項５記載の地盤硬化層造成装置   For each injection nozzle, a plurality of nozzle holes are provided in the site where the setting position needs to be changed depending on the installation conditions, and the nozzle tip is inserted into the nozzle hole selected according to the installation environment to form the injection nozzle, and other nozzle holes 6. A ground hardened layer forming device according to claim 5, wherein a cover chip is inserted and closed. ノズル孔に嵌入して噴射ノズルを構成するノズルチップについて、噴射孔を所定の角度付けにより穿設して構成し、角度選択によりノズル孔に嵌入することにより所定の角度方向に噴射する噴射ノズルが形成されるようにした請求項６記載の地盤硬化層造成装置   A nozzle tip that is inserted into a nozzle hole to form an injection nozzle is formed by forming an injection hole with a predetermined angle, and an injection nozzle that is injected in a predetermined angular direction by being inserted into the nozzle hole by angle selection. 7. The ground hardened layer forming device according to claim 6, wherein the ground hardened layer forming device is formed.
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