JP4197501B2 - High pressure spray ground improvement device and high pressure spray ground improvement method - Google Patents

High pressure spray ground improvement device and high pressure spray ground improvement method Download PDF

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JP4197501B2
JP4197501B2 JP2004093194A JP2004093194A JP4197501B2 JP 4197501 B2 JP4197501 B2 JP 4197501B2 JP 2004093194 A JP2004093194 A JP 2004093194A JP 2004093194 A JP2004093194 A JP 2004093194A JP 4197501 B2 JP4197501 B2 JP 4197501B2
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stirring blade
rod
ground improvement
high pressure
stirring
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JP2005281974A (en
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経 西尾
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Onoda Chemico Co Ltd
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Description

この発明は、高圧噴射地盤改良装置及び高圧噴射地盤改良方法に関する。   The present invention relates to a high-pressure spray ground improvement device and a high-pressure spray ground improvement method.

経済的な地盤改良を行うためには、改良半径を大きくすることが望まれる。特許文献１には、ロッドに直角方向に設けた攪拌翼の先端部分から高圧噴射によって硬化液を噴流し、ロッドを回転させ、引き抜く地盤改良工法が開示されている。この方法によれば、攪拌翼の長さの分だけ、改良半径を大きくすることができる。   In order to perform economical ground improvement, it is desired to increase the improvement radius. Patent Document 1 discloses a ground improvement method in which a hardening liquid is jetted by high-pressure jetting from a tip portion of a stirring blade provided in a direction perpendicular to the rod, and the rod is rotated and pulled out. According to this method, the improved radius can be increased by the length of the stirring blade.

一方、改良半径を大きくするために、硬化液を高圧で噴射させることが行われている。硬化液を高圧で噴射させると、高圧による側圧が周辺地盤に変位を与え、近接した構造物に悪影響を及ぼすことがある。
この問題を解決するために、特許文献２には、注入ロッドをスクリューオーガー状に構成した高圧噴射地盤改良装置が開示されている。この高圧噴射地盤改良装置を用いた地盤改良方法によれば、スクリューオーガー部によってコア部分を排土して、コア空隙部を形成する。コア空隙部の形成と共に、注入ロッドに硬化材を高圧圧送し、羽根体の先端から外側方向に高圧噴射しつつ、ロッドを回転上昇させる。この際、噴射注入加圧の側圧を、排土したコア空隙部に逃がすことができるため、側圧による変位を防止しながら、中空円筒状の改良体を造成することができる。 On the other hand, in order to increase the improved radius, the curable liquid is sprayed at a high pressure. When the curable liquid is sprayed at a high pressure, the side pressure due to the high pressure may cause displacement of the surrounding ground, which may adversely affect adjacent structures.
In order to solve this problem, Patent Document 2 discloses a high-pressure spray ground improvement device in which an injection rod is configured in a screw auger shape. According to the ground improvement method using this high-pressure spray ground improvement device, the core portion is discharged by the screw auger portion to form the core gap portion. Along with the formation of the core gap, the hardening material is pumped to the injection rod at a high pressure, and the rod is rotated and raised while being jetted from the tip of the blade body toward the outside. At this time, since the side pressure of the injection injection pressurization can be released to the core void portion that has been discharged, a hollow cylindrical improved body can be created while preventing displacement due to the side pressure.

特開昭５７−５１３２４号公報JP-A-57-51324 特開昭５７−５１３２６号公報JP 57-51326 A

しかしながら、これら従来の方法では、攪拌翼によって切削された円柱状の中心部分の攪拌領域は、直接硬化液を噴流しない構造であるため、攪拌翼外周部の改良混合土は、攪拌領域へ必然的に７０％程度吸収されるものの、完全には満たされず、攪拌翼中心部に不均一部分を残すという問題があった。
また、この問題点を解決するために、ロッドを二重管方式として、攪拌領域まで硬化液を供給させる方法も考えられているが、装置が複雑化したり、注入ポンプ等の増設が必要であるため、高コストになるといった問題があった。 However, in these conventional methods, the stirring region in the central part of the columnar shape cut by the stirring blade has a structure that does not directly jet the hardening liquid, so that the improved mixed soil on the outer periphery of the stirring blade is inevitably transferred to the stirring region. However, it was not completely satisfied, and there was a problem that a non-uniform portion was left in the central portion of the stirring blade.
In order to solve this problem, a method of supplying a curable liquid to a stirring region by using a rod as a double tube method is also considered, but the apparatus becomes complicated or an injection pump or the like needs to be added. Therefore, there was a problem that the cost was high.

この発明は、このような問題点を解決するためになされたもので、中心部に不均一部分のない改良体を造成する高圧噴射地盤改良装置と高圧噴射地盤改良方法を提供することを目的とする。   The present invention has been made to solve such problems, and an object thereof is to provide a high-pressure spray ground improvement device and a high-pressure spray ground improvement method for creating an improved body having no non-uniform portion at the center. To do.

この発明に係る高圧噴射地盤改良装置は、内部に硬化液が圧送される通路を有するロッドと、このロッドの先端部に取り付けられ、地盤を切削する攪拌翼と、この攪拌翼の先端部に取り付けられ、通路と連通した噴射ノズルと、攪拌翼の上方に取り付けられ、ロッドの回転によって攪拌翼と共に回転し、ロッドが引き上げられる際に、攪拌翼によって乱された攪拌翼上方の土砂を排出するじゃかご体とを備え、じゃかご体の投影面積が、攪拌翼の攪拌面積の１０〜７０％に相当することを特徴とする。 A high-pressure jet ground improvement device according to the present invention includes a rod having a passage through which a hardening liquid is pumped, a stirring blade attached to a tip portion of the rod, cutting the ground, and a tip attached to the tip portion of the stirring blade. is, an injection nozzle in communication with the passageway, mounted above the stirring blade rotates with the stirring blade by the rotation of the rod, when the rod is lifted, 's to discharge the stirring blade upper sediment was disturbed by the stirring blade and a car body, the projected area of the gabion body, characterized in that corresponding to 10% to 70% of the agitation area of the agitation blades.

また、この発明に係る高圧噴射地盤改良方法は、先端部に、攪拌翼及び、この攪拌翼の上方に、攪拌面積の１０〜７０％に相当する投影面積を有するじゃかご体を備えたロッドを、先端部側から地盤の所定深度まで貫入させる工程と、ロッド先端部を引き上げると共に、じゃかご体が攪拌翼上方の土砂を排出することによって、攪拌翼上方に体積変化を生じさせる工程と、噴射ノズルから硬化液を高圧噴射する工程と、高圧噴射された硬化液が地盤と混合されて混合土となり、攪拌翼上方に生じた体積変化によって、混合土が、攪拌翼によって乱された領域に吸引される工程とから構成される。

Further, the method for improving the high-pressure jet ground according to the present invention comprises a rod provided with a stirring blade at the tip and a cage body having a projected area corresponding to 10 to 70% of the stirring area above the stirring blade. a step of penetrating the front end portion to a predetermined depth of the ground, along with raising the rod tip by gabion body discharges a stirring blade upper soil, a step of causing a volume change in the stirring blade upward, injection The step of high-pressure injection of the curable liquid from the nozzle and the high-pressure injected curable liquid is mixed with the ground to become mixed soil, and the mixed soil is sucked into the area disturbed by the stirring blade due to the volume change generated above the stirring blade The process is comprised.

この発明によれば、攪拌翼の上方に、ロッドの回転によって攪拌翼と共に回転する土砂排出部材を取り付け、攪拌翼によって乱された攪拌翼上方の土砂を土砂排出部材が保持することによって、攪拌領域に体積変化が発生するため、外周部の混合土が攪拌領域に吸引されやすくなり、中心部に不均一部分のない改良体を造成することができる。   According to this invention, the earth and sand discharging member that rotates together with the stirring blade by the rotation of the rod is attached above the stirring blade, and the earth and sand discharging member holds the earth and sand above the stirring blade that is disturbed by the stirring blade. Therefore, the mixed soil at the outer peripheral portion is easily sucked into the stirring region, and an improved body having no non-uniform portion at the central portion can be formed.

以下、この発明の実施の形態を添付図面に基づいて説明する。
実施の形態１．
図１に示されるように、この実施の形態に係る高圧噴射地盤改良装置１は、高圧噴射攪拌装置２とロッド３とで構成される。高圧噴射攪拌装置２には、駆動装置４が昇降自在に取り付けられ、駆動装置４にロッド３が回転可能に連結されている。ロッド３は、高圧噴射攪拌装置２に取り付けられたチャック５を貫通し、下方に延びている。
ロッド３の先端部分には、地盤を切削する攪拌翼６が、ロッド３に対して左右対称に取り付けられている。また、攪拌翼６の上方には、ロッド３の回転によって攪拌翼６と共に回転するように、土砂排出部材である逆円錐型スクリュー盤７が取り付けられている。この逆円錐型スクリュー盤７の投影平面形状については、スクリュー盤の刃先７ａが少なくとも１周以上形成されたスクリュー盤である。
攪拌翼６の片方の先端には噴射ノズル８が設置され、ロッド３内に設けられた図示しない通路に連通している。この図示しない通路は、スイベル９を介してロッド３に接続されたホース１０と連通し、ホース１０は、硬化液を貯蔵する図示しない容器に連通している。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
As shown in FIG. 1, the high-pressure jet ground improvement device 1 according to this embodiment includes a high-pressure jet stirring device 2 and a rod 3. A driving device 4 is attached to the high-pressure jet agitating device 2 so as to be movable up and down, and a rod 3 is rotatably connected to the driving device 4. The rod 3 penetrates the chuck 5 attached to the high-pressure jet stirring device 2 and extends downward.
A stirring blade 6 for cutting the ground is attached to the tip portion of the rod 3 symmetrically with respect to the rod 3. In addition, an inverted conical screw board 7 as a sediment discharge member is attached above the stirring blade 6 so as to rotate together with the stirring blade 6 by the rotation of the rod 3. The projected plane shape of the inverted conical screw board 7 is a screw board in which the cutting edge 7a of the screw board is formed at least one round.
An injection nozzle 8 is installed at one end of the stirring blade 6 and communicates with a passage (not shown) provided in the rod 3. The passage (not shown) communicates with a hose 10 connected to the rod 3 via a swivel 9, and the hose 10 communicates with a container (not shown) that stores the curable liquid.

図２に示されるように、ロッド３に対して垂直な面に投影された逆円錐型スクリュー盤７の投影面積をＡ１とし、攪拌翼６が回転する際にロッド３に対して垂直な面に描かれる円形領域の面積である攪拌面積をＡ２とする。Ａ１とＡ２の関係が、Ａ１＝（０．１〜０．７）×Ａ２となるように、逆円錐型スクリュー盤７の大きさが設定されている。この関係を、図３で示されるような直径の比率で表すと、Ｄ１＝（０．３〜０．８５）Ｄ２となる。 As shown in FIG. 2, a plane perpendicular to the rod 3 in the A 1 to the projected area of the inverted cone screw plate 7 which is projected on a plane perpendicular to the rod 3, stirring blade 6 rotates A 2 is a stirring area which is an area of a circular region drawn in (1). The size of the inverted conical screw board 7 is set so that the relationship between A 1 and A 2 is A 1 = (0.1 to 0.7) × A 2 . When this relationship is represented by the ratio of diameters as shown in FIG. 3, D 1 = (0.3 to 0.85) D 2 .

次に、この実施の形態に係る高圧噴射地盤改良装置１の動作を、図１に基づいて説明する。
駆動装置４により、ロッド３が回転され下降される。これにより、攪拌翼６が回転し、ロッド３の周りの地盤を切削しながら、ロッド３を地盤の所定深度まで貫入させる。 Next, the operation of the high-pressure jet ground improvement apparatus 1 according to this embodiment will be described with reference to FIG.
The rod 3 is rotated and lowered by the driving device 4. Thereby, the stirring blade 6 rotates, and the rod 3 is penetrated to a predetermined depth of the ground while cutting the ground around the rod 3.

地盤の所定深度まで貫入されたロッド３は、駆動装置４によって回転しながら引き上げられる。この際、硬化液１１が、図示しない容器からホース１０を介してロッド３内に設けられた図示しない通路を圧送され、噴射ノズル８から噴射される。その噴射によるエネルギーによって、攪拌ノズル８周辺の地盤を混合攪拌し、円筒状の改良体１２を造成する。尚、高圧噴射方向は一方向だけでなく、両方向であってもよい。すなわち、攪拌翼６の片方の先端のみに噴射ノズル８が設置されているのではなく、両方の先端に噴射ノズル８が設置されていてもよい。   The rod 3 penetrated to a predetermined depth of the ground is pulled up while being rotated by the driving device 4. At this time, the curable liquid 11 is pressure-fed through a passage (not shown) provided in the rod 3 from a container (not shown) via the hose 10 and is jetted from the jet nozzle 8. The ground around the agitation nozzle 8 is mixed and agitated by the energy of the injection, and a cylindrical improvement body 12 is formed. The high-pressure injection direction may be not only one direction but also both directions. That is, the injection nozzle 8 may not be provided only at one end of the stirring blade 6 but may be provided at both ends.

一方、攪拌翼６の回転と共に逆円錐型スクリュー盤７が回転し、攪拌翼６によって切削された円筒状の攪拌領域１４内の乱された土を、逆円錐型スクリュー盤７が図４に示されるような球根形状１５で保持し上昇させる。この時、この攪拌領域１４に体積変化が起こり、改良体１２のまだ硬化していない流動化した改良混合土が攪拌領域１４に流れ込んで体積変化分を埋め合わせることによって、攪拌領域１４に円柱状の改良体１３が造成される。   On the other hand, the reverse conical screw disk 7 rotates along with the rotation of the stirring blade 6 and the disturbed soil in the cylindrical stirring region 14 cut by the stirring blade 6 is shown in FIG. The bulb shape 15 is held and raised. At this time, a volume change occurs in the stirring region 14, and the fluidized improved mixed soil that has not yet hardened the improved body 12 flows into the stirring region 14 to make up for the volume change, thereby forming a columnar shape in the stirring region 14. An improved body 13 is created.

このように、攪拌翼６の上方に取り付けられた逆円錐型スクリュー盤７によって、攪拌領域１４の乱された土を排出させて体積変化を生じさせ、その体積変化によって攪拌翼６の外周部に形成された改良体から、まだ硬化していない改良混合土が流れ込むので、攪拌翼６外周部に造成された改良体と同質の円柱状改良体を、攪拌領域１４に造成することができ、中心部に不均一部分のない改良体を造成することができる。   In this manner, the inverted conical screw board 7 attached above the stirring blade 6 causes the disturbed soil in the stirring region 14 to be discharged to cause a volume change, and the volume change causes the outer periphery of the stirring blade 6 to move. Since the improved mixed soil which has not yet hardened flows from the formed improved body, a cylindrical improved body having the same quality as the improved body formed on the outer peripheral portion of the stirring blade 6 can be formed in the stirring region 14. It is possible to create an improved body having no uneven portion in the part.

実施の形態２．
次に、この発明の実施の形態２に係る高圧噴射地盤改良装置を図５及び６に基づいて説明する。
この実施の形態２に係る高圧噴射地盤改良装置は、実施の形態１に対して、土砂排出部材をじゃかご体にしたものである。図５に示されるように、攪拌翼６の上方に円環２１を取り付け、円環２１に２本の金属棒２２が半球状に曲げられて接続されることによって、じゃかご体２３が形成されている。図６は、じゃかご体２３の平面図であるが、円環２１は２本の支持棒２４によって、ロッド３に取り付けられている。 Embodiment 2. FIG.
Next, a high-pressure jet ground improvement apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS.
The high-pressure jet ground improvement device according to the second embodiment is a structure in which the earth and sand discharging member is a cage body as compared with the first embodiment. As shown in FIG. 5, a circular ring 21 is attached above the stirring blade 6, and two metal rods 22 are bent and connected to the circular ring 21 to form a cage body 23. ing. FIG. 6 is a plan view of the cage body 23, and the ring 21 is attached to the rod 3 by two support rods 24.

このじゃかご体２３を備えたロッド３が地盤の所定深度まで貫入された後、回転しながら引き上げられると、円環２１と金属棒２２とによって構成された半球状の空間に、乱された土が入り込む。すると、実施の形態１と同様に、円環２１上に図４に示されるような球根状の土の塊が形成されて排出され、攪拌領域１４に体積変化が起こる。その結果、中心部に不均一部分のない改良体が造成される。   When the rod 3 provided with the jack body 23 is penetrated to a predetermined depth of the ground and then lifted while rotating, a disturbed soil is formed in a hemispherical space formed by the ring 21 and the metal rod 22. Enters. Then, as in the first embodiment, a bulbous soil lump as shown in FIG. 4 is formed and discharged on the annular ring 21, and a volume change occurs in the stirring region 14. As a result, an improved body having a non-uniform portion at the center is formed.

この実施の形態で使用されたじゃかご体２３は、円環２１と２本の金属棒２２によって半球状に形成されていたが、このような構成に限定されるものではない。乱された土を内部に取り込むことのできる空間を有したものであれば、同様の効果を得ることができる。   The cage body 23 used in this embodiment is formed in a hemispherical shape by the annular ring 21 and the two metal rods 22, but is not limited to such a configuration. The same effect can be obtained as long as it has a space that can take in the disturbed soil.

次に、この発明に係る高圧噴射地盤改良装置１について、中心部に不均一部分のない改良体を造成する効果を、実施例によって確認した。
使用した装置は、実施の形態１に係る高圧噴射地盤改良装置１であって、逆円錐型スクリュー盤７の投影面積Ａ１と、攪拌翼６の攪拌面積Ａ２との比率を変化させたときの、中心部分に残る不均一部分の直径（中心部不均一径）を測定した。 Next, with respect to the high-pressure jet ground improvement device 1 according to the present invention, the effect of creating an improved body without a non-uniform portion at the center was confirmed by examples.
The used apparatus is the high-pressure jet ground improvement apparatus 1 according to Embodiment 1, and the ratio of the projected area A 1 of the inverted conical screw board 7 and the stirring area A 2 of the stirring blade 6 is changed. The diameter of the non-uniform portion remaining in the central portion (central non-uniform diameter) was measured.

この結果を図７に示す。Ａ１／Ａ２が増大すると、中心部不均一径が低下する。特に、Ａ１／Ａ２が０．１以下の範囲では、この傾向が著しい。この結果を基に、逆円錐型スクリュー盤７の大きさを、Ａ１＝（０．１〜０．７）×Ａ２となるように設定した。Ａ１＜０．１Ａ２であると、攪拌領域１４の体積変化が小さすぎて、攪拌翼６の外周から吸収される改良土が不足し、改良体中心部の不均一部分が大きくなるからであり、Ａ１＞０．７Ａ２であると、貫入・引き抜き抵抗が大きすぎ作業能率が落ちてしまうからである。
一方、Ａ１／Ａ２≒０．２５〜０．３０程度でほぼ不均一径がゼロと見なせることから、貫入抵抗等の施工能率を考えると、Ａ１／Ａ２はこの範囲で最適であると考えられる。ただし、改良対象土が非常に軟弱なヘドロ等の場合には、硬化材の噴射エネルギーによって改良土が周辺に逃げやすくなるので、Ａ１／Ａ２の値を０．２５〜０．３０より大きく設定する必要がある。 The result is shown in FIG. As A 1 / A 2 increases, the center non-uniform diameter decreases. In particular, this tendency is remarkable when A 1 / A 2 is 0.1 or less. Based on this result, the size of the inverted conical screw board 7 was set to satisfy A 1 = (0.1 to 0.7) × A 2 . If A 1 <0.1A 2 , the volume change of the stirring region 14 is too small, and the improved soil absorbed from the outer periphery of the stirring blade 6 is insufficient, and the uneven portion at the center of the improved body becomes large. The reason is that if A 1 > 0.7A 2 , the penetration / extraction resistance is too large and the work efficiency falls.
On the other hand, since A 1 / A 2 ≈0.25 to 0.30 and the non-uniform diameter can be regarded as zero, considering the construction efficiency such as penetration resistance, A 1 / A 2 is optimal within this range. it is conceivable that. However, in the case where the soil to be improved is very soft sludge, etc., the improved soil easily escapes to the periphery by the injection energy of the hardener, so the value of A 1 / A 2 is larger than 0.25 to 0.30. Must be set.

実施の形態１に係る高圧噴射地盤改良装置の構成図である。It is a block diagram of the high pressure injection ground improvement apparatus which concerns on Embodiment 1. FIG. 逆円錐型スクリュー盤の大きさを説明するための図である。It is a figure for demonstrating the magnitude | size of a reverse cone type screw disk. 逆円錐型スクリュー盤の大きさを説明するための別の図である。It is another figure for demonstrating the magnitude | size of a reverse cone type screw disk. 逆円錐型スクリュー盤が土を保持した状態を表す図である。It is a figure showing the state where the reverse cone screw board hold | maintained the soil. 実施の形態２に係る高圧噴射地盤改良装置のロッド先端の図である。It is a figure of the rod front-end | tip of the high pressure injection ground improvement apparatus which concerns on Embodiment 2. FIG. 実施の形態２に係るじゃかご体の平面図である。6 is a plan view of a basket body according to Embodiment 2. FIG. 実施例の結果を表す図である。It is a figure showing the result of an Example.

符号の説明Explanation of symbols

１ 高圧噴射地盤改良装置、３ ロッド、６ 攪拌翼、７ 逆円錐型スクリュー盤、８ 噴射ノズル、１１ 硬化液、２３ じゃかご体。   DESCRIPTION OF SYMBOLS 1 High pressure injection ground improvement apparatus, 3 Rod, 6 Stirring blade, 7 Inverted conical screw board, 8 Injection nozzle, 11 Hardening liquid, 23 Jaw body

Claims (2)

内部に硬化液が圧送される通路を有するロッドと、
この前記ロッドの先端部に取り付けられ、地盤を切削する攪拌翼と、
この前記攪拌翼の先端部に取り付けられ、前記通路と連通した噴射ノズルと、
前記攪拌翼の上方に取り付けられ、前記ロッドの回転によって前記攪拌翼と共に回転し、前記ロッドが引き上げられる際に、前記攪拌翼によって乱された前記攪拌翼上方の土砂を排出するじゃかご体と、
を備え、
前記じゃかご体の投影面積が、前記攪拌翼の攪拌面積の１０〜７０％に相当することを特徴とする高圧噴射地盤改良装置。 A rod having a passage through which the curable liquid is pumped;
A stirring blade attached to the tip of the rod and cutting the ground;
An injection nozzle attached to the tip of the stirring blade and in communication with the passage;
Mounted above the stirring blade rotates with the stirring blade by the rotation of the rod, when said rod is pulled, the gabion body for discharging the stirring blade upper sediment was disturbed by the agitation blade,
With
The high pressure jet ground improvement device, wherein the projected area of the cage body corresponds to 10 to 70% of the stirring area of the stirring blade. 先端部に、攪拌翼及び、この攪拌翼の上方に、攪拌面積の１０〜７０％に相当する投影面積を有するじゃかご体を備えたロッドを、前記先端部側から地盤の所定深度まで貫入させる工程と、
前記ロッド先端部を引き上げると共に、前記じゃかご体が前記攪拌翼上方の土砂を排出することによって、前記攪拌翼上方に体積変化を生じさせる工程と、
前記噴射ノズルから硬化液を高圧噴射する工程と、
高圧噴射された硬化液が地盤と混合されて混合土となり、前記攪拌翼上方に生じた体積変化によって、前記混合土が、前記攪拌翼によって乱された領域に吸引される工程と
を備える高圧噴射地盤改良方法。 A rod provided with a stirring blade at the tip and a cage body having a projected area corresponding to 10 to 70% of the stirring area above the stirring blade is penetrated from the tip to the predetermined depth of the ground. Process,
The step of pulling up the tip of the rod and causing the cage body to change the volume above the stirring blade by discharging the earth and sand above the stirring blade;
A step of high-pressure jetting the curable liquid from the jet nozzle;
A high pressure jet including a step of mixing the hardened liquid sprayed with high pressure with the ground into mixed soil, and sucking the mixed soil into a region disturbed by the stirring blade by a volume change generated above the stirring blade. Ground improvement method.
JP2004093194A 2004-03-26 2004-03-26 High pressure spray ground improvement device and high pressure spray ground improvement method Expired - Fee Related JP4197501B2 (en)

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