JP6188982B1 - Ground improvement device and improved wall construction method - Google Patents

Ground improvement device and improved wall construction method Download PDF

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JP6188982B1
JP6188982B1 JP2017040009A JP2017040009A JP6188982B1 JP 6188982 B1 JP6188982 B1 JP 6188982B1 JP 2017040009 A JP2017040009 A JP 2017040009A JP 2017040009 A JP2017040009 A JP 2017040009A JP 6188982 B1 JP6188982 B1 JP 6188982B1
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mixing
arm
head
center line
stirring
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JP2018145642A (en
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貴哉 牧野
貴哉 牧野
浩邦 伊藤
浩邦 伊藤
牧野　昌己
昌己 牧野
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Kato Construction Co Ltd
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Abstract

【課題】小型軽量で且つ使い勝手の良好な取付角調整機構を有する地盤改良装置を提供する。【解決手段】ベースマシンのアーム５と混合撹拌ヘッド６との間に、その混合撹拌ヘッド６の角度調整のための中間ブラケット方式の取付角度調整機構７が介装されている。アーム側ブラケット２６の固定板２８とそれに対して回転可能なヘッド側ブラケット２７の可動板３０とが、両者を貫通する軸部材３２を解して結合されている。さらに、固定板２８と可動板３０とが多数のボルト・ナット３６により締結固定されている。軸部材３２の両端には抜け止め部材３５が不離一体に固定され、アーム側ブラケット２６からのヘッド側ブラケット２７の脱落防止機構５０を形成している。【選択図】図５A ground improvement device having a mounting angle adjusting mechanism that is small and light and has good usability. An intermediate bracket type mounting angle adjustment mechanism for adjusting the angle of the mixing and stirring head is interposed between an arm of the base machine and the mixing and stirring head. The fixed plate 28 of the arm side bracket 26 and the movable plate 30 of the head side bracket 27 that can rotate with respect to the arm side bracket 26 are coupled via a shaft member 32 that penetrates both of them. Further, the fixed plate 28 and the movable plate 30 are fastened and fixed by a large number of bolts and nuts 36. A retaining member 35 is fixed to both ends of the shaft member 32 so as not to be separated, and a mechanism 50 for preventing the head side bracket 27 from falling off from the arm side bracket 26 is formed. [Selection] Figure 5

Description

本発明は、地盤改良装置として、上下方向に周回移動するチェーン式の混合撹拌翼を備えた混合撹拌ヘッドをバックホウに代表されるベースマシンのアーム先端に装着したものに関する。詳しくは、その混合撹拌ヘッドを地中に所定深度まで貫入した上で、固化材の吐出のほか混合撹拌翼による原位置土の掘削およびその原位置土と固化材との混合撹拌を行いながら、地中に混合撹拌翼の周回移動面の幅寸法に相当する連続した鉛直な改良壁体を構築するための地盤改良装置とそれを用いた改良壁体の構築方法に関するものである。   The present invention relates to a ground improvement device in which a mixing agitation head having a chain-type mixing agitation blade that moves around in the vertical direction is attached to the tip of an arm of a base machine represented by a backhoe. Specifically, after penetrating the mixing agitation head into the ground to a predetermined depth, in addition to discharging the solidified material, excavating the original soil with the mixing agitating blade and mixing the original soil with the solidified material, The present invention relates to a ground improvement device for constructing a continuous vertical improvement wall body corresponding to the width dimension of the orbiting moving surface of a mixing agitating blade, and a method for constructing an improvement wall body using the same.

この種の地盤改良装置として例えば特許文献１に記載されたものが本出願人により提案されている。この特許文献１に記載された地盤改良装置では、バックホウ等のショベル系掘削機械に代表されるベースマシンのアームの先端にアタッチメントとして混合撹拌ヘッドを吊り下げ支持させるにあたり、上記アームの先端と混合撹拌ヘッドとの間にアクチュエータ駆動方式の旋回機構を介装し、アームから吊り下げた鉛直姿勢のままで混合撹拌ヘッドの姿勢変更を可能としたものである。   As this kind of ground improvement device, for example, one described in Patent Document 1 has been proposed by the present applicant. In the ground improvement device described in Patent Document 1, when the mixing agitation head is suspended and supported as an attachment on the tip of an arm of a base machine represented by an excavator excavation machine such as a backhoe, the mixing agitation is performed with the tip of the arm. An actuator-driven swivel mechanism is interposed between the head and the head, and the posture of the mixing and stirring head can be changed while maintaining the vertical posture suspended from the arm.

かかる特許文献１に記載された地盤改良装置では、例えば平面視にて多角形をなす筒状構造体をいわゆる地中連続壁の形態で地中に構築する際に好都合となるとされている。すなわち、多角形の中心位置相当部にベースマシンを静止させた上で、多角形の筒状構造体の特定の一辺部となる鉛直壁部の施工に続いてそれに連続する鉛直壁部を続けて施工する際に、上記旋回機構による旋回自由度を使って混合撹拌ヘッドの姿勢を変更するだけで、ベースマシンそのものは全く移動させる必要がなく、多角形の筒状構造体の施工を効率良く行うことができることになる。   In the ground improvement device described in Patent Document 1, for example, it is considered to be convenient when a cylindrical structure having a polygonal shape in a plan view is constructed in the ground in the form of a so-called underground continuous wall. In other words, after the base machine is stationary at the central position corresponding to the polygon, the construction of the vertical wall that is a specific side of the polygonal cylindrical structure is followed by the vertical wall that continues to the construction. When constructing, simply changing the attitude of the mixing and stirring head using the degree of freedom of swirling by the swivel mechanism, the base machine itself does not need to be moved at all, and polygonal cylindrical structures are efficiently constructed. Will be able to.

特開２００４−１０８１３６号公報JP 2004-108136 A

しかしながら、特許文献１に記載された地盤改良装置では、混合撹拌ヘッドそのものの使用形態よりして、ベースマシンのアームの先端部と混合撹拌ヘッドとの間に介装される旋回機構も堅牢な構造のものとする必要があり、必然的にアクチュエータとその動力伝達系を含む旋回機構の形状および重量が過大となる傾向にある。そのため、混合撹拌ヘッドの重量に旋回機構の重量が加わるだけでなく、混合撹拌時に付着した土砂重量が加わり、ベースマシンの重量負荷が大きくなりすぎて、施工中のベースマシンの姿勢が不安定となるおそれがあった。   However, in the ground improvement device described in Patent Document 1, the swiveling mechanism interposed between the tip of the arm of the base machine and the mixing stirring head is more robust than the use form of the mixing stirring head itself. Inevitably, the shape and weight of the turning mechanism including the actuator and its power transmission system tend to be excessive. Therefore, not only the weight of the swirling mechanism is added to the weight of the mixing and stirring head, but also the weight of earth and sand adhering to the mixing and stirring is added, the weight load of the base machine becomes too large, and the posture of the base machine during construction becomes unstable. There was a risk of becoming.

この傾向は、後述する図１３に示すように、平面視にて構築すべき改良壁体の厚み寸法を二分する平面中心線に対しベースマシンの履帯を平行に保ちつつ、混合撹拌ヘッドにおける混合撹拌翼の周回移動面と前記平面中心線とを直角とした上で、上記平面中心線とベースマシンの平面視でのブームおよびアームの中心線とのなす角度が鋭角になるような姿勢にてベースマシンを構えて、ブームおよびアームの揺動動作方向に力に基づく上記平面中心線方向の分力を当該平面中心線方向への掘進ベクトルとして混合撹拌ヘッドを掘進させる場合に特に顕著となる。   As shown in FIG. 13 described later, this tendency is caused by mixing and stirring in the mixing and stirring head while keeping the crawler track of the base machine parallel to the plane center line that bisects the thickness dimension of the improved wall body to be constructed in plan view. The base with a posture in which the angle formed by the plane center line and the center line of the boom and arm in a plan view of the base machine is an acute angle with the plane of movement of the wing and the plane center line perpendicular to each other. This is particularly noticeable when holding the machine and digging the mixing and stirring head with the component force in the plane center line direction based on the force in the swing operation direction of the boom and arm as the digging vector in the plane center line direction.

また、ベースマシンの先端部と混合撹拌ヘッドとの間に介装される旋回機構の高さ寸法が大きくなると、その分だけベースマシンのアーム先端から混合撹拌ヘッドの先端までの距離が大きくなる。そのため、地中に貫入した混合撹拌ヘッドを掘進させる場合に、混合撹拌ヘッドの下端部が上端部に比べて遅れ気味となって混合撹拌ヘッドの鉛直姿勢を維持できなくなり、掘進能力が低下することとなって好ましくない。この傾向は、混合撹拌ヘッドの長さが大きくなって、地中への貫入深度が大きくなるほど顕著となる。   Further, when the height dimension of the turning mechanism interposed between the front end portion of the base machine and the mixing and stirring head is increased, the distance from the front end of the arm of the base machine to the front end of the mixing and stirring head is increased accordingly. Therefore, when the mixing agitation head penetrating into the ground is dug, the lower end portion of the mixing agitation head becomes delayed compared to the upper end portion, and the vertical posture of the mixing agitation head cannot be maintained, and the excavation ability is reduced. It is not preferable. This tendency becomes more prominent as the length of the mixing and stirring head increases and the depth of penetration into the ground increases.

本発明はこのような課題に着目してなされたものであり、機能上、最低限必要なベースマシンのアームの先端部に対する混合撹拌ヘッドの取付角調整のための調整自由度のみを残して、アクチュエータを廃止し、もって小型軽量で且つ使い勝手の良好な取付角調整機構を有する地盤改良装置とそれを用いた改良壁体の構築方法を提供するものである。   The present invention has been made paying attention to such a problem, leaving only the degree of freedom of adjustment for adjusting the mounting angle of the mixing and stirring head relative to the tip of the arm of the base machine, which is the minimum necessary in terms of function, It is an object of the present invention to provide a ground improvement device having a mounting angle adjusting mechanism that is small and light and easy to use by eliminating the actuator, and a method for constructing an improved wall body using the same.

本発明は、ショベル系の掘削機をベースマシンとして、そのベースマシンのアームの先端部に、上下方向に周回移動するチェーン式の混合撹拌翼を備えた混合撹拌ヘッドを装着し、前記混合撹拌ヘッドの混合撹拌翼による原位置土の掘削およびその原位置土と固化材との混合撹拌を行いながら、地中に前記混合撹拌翼の周回移動面の幅寸法に相当する連続した鉛直な改良壁体を構築する地盤改良装置であって、前記改良壁体の構築に際して、平面視にて構築すべき改良壁体の厚み寸法を二分する平面中心線に対し前記ベースマシンの履帯をほぼ平行に保ちつつ、前記混合撹拌翼の周回移動面と前記平面中心線とをほぼ直角とした上で、前記混合撹拌ヘッドを前記平面中心線方向に掘進させるようにした地盤改良装置である。   According to the present invention, an excavator of excavator system is used as a base machine, and a mixing agitation head having a chain-type mixing agitation blade that moves around in the vertical direction is attached to the tip of an arm of the base machine. A continuous vertical improvement wall corresponding to the width dimension of the orbiting moving surface of the mixed stirring blade in the ground while excavating the original soil with the mixed stirring blade and mixing and stirring the original soil and the solidified material. In the construction of the ground improvement device, the crawler belt of the base machine is kept substantially parallel to the plane center line that bisects the thickness dimension of the improvement wall to be constructed in plan view. The ground improvement device is configured to make the mixing and stirring head dig in the direction of the plane center line after the circumferential moving surface of the mixing and stirring blade is substantially perpendicular to the plane center line.

その上で、前記混合撹拌ヘッドは、本体部となる支柱の上端部と下端部との間に無端状をなす前記チェーン式の混合撹拌翼を巻き掛けたものである一方、前記ベースマシンのアームの先端部と前記混合撹拌ヘッドとの間に、前記平面中心線と前記ベースマシンの平面視でのブームおよびアームの中心線とのなす角度を調整可能な取付角調整機構が設けられている。   In addition, the mixing agitation head is obtained by winding the endless chain mixing agitation blade between the upper end portion and the lower end portion of the column as the main body portion, while the arm of the base machine An attachment angle adjusting mechanism capable of adjusting an angle formed by the plane center line and the center line of the boom and the arm in a plan view of the base machine is provided between the front end portion of the base machine and the mixing and stirring head.

そして、前記取付角調整機構は、前記ベースマシンのアームの先端部に連結される固定板と、前記混合撹拌ヘッドの上端部に連結されると共に前記固定板と重ね合わされる可動板と、前記固定板と可動板の中心部を貫通するように前記支柱の中心線の延長線上に配置され、前記固定板に対して前記可動板を回転可能に連結支持している軸部材と、前記固定板に対して前記可動板を回転させた位置に規制してねじ締め固定する締結固定手段と、を備えているものである。   The mounting angle adjusting mechanism includes a fixed plate connected to the tip of the arm of the base machine, a movable plate connected to the upper end of the mixing and stirring head and overlapped with the fixed plate, and the fixed A shaft member disposed on an extension of the center line of the column so as to pass through the center portion of the plate and the movable plate, and rotatably supporting the movable plate with respect to the fixed plate; and the fixed plate On the other hand, there is provided fastening and fixing means for restricting the movable plate to a rotated position and fixing it by screwing.

好ましい態様としては、前記混合撹拌ヘッドがベースマシンのアームの先端部に吊り下げ支持される際の重量バランスに基づく姿勢安定性を考慮し、前記混合撹拌ヘッドは、前記支柱の上端部にモータとそれによって駆動される駆動輪を、前記支柱の下端部に従動輪をそれぞれ配置すると共に、それらの駆動輪と従動輪との間に前記チェーン式の混合撹拌翼を巻き掛けたものであって、前記混合撹拌ヘッドの平面視において、張り側となる前記チェーン式の混合撹拌翼と緩み側となる前記チェーン式の混合撹拌翼とで挟まれた領域であって且つ前記チェーン式の混合撹拌翼の幅寸法内で、前記取付角調整機構の軸部材と、前記混合撹拌ヘッドの支柱、モータ、駆動輪および従動輪のそれぞれが重なり合うように配置されている。   As a preferred embodiment, in consideration of posture stability based on a weight balance when the mixing agitation head is suspended and supported by the tip of an arm of a base machine, the mixing agitation head is connected to a motor at the upper end of the column. The drive wheels driven thereby are arranged by following the driven wheels at the lower end of the column, and the chain-type mixing stirring blades are wound between the drive wheels and the driven wheels, In the plan view of the mixing and stirring head, the chain-type mixing and stirring blade is a region sandwiched between the chain-type mixing and stirring blade that is on the tight side and the chain-type mixing and stirring blade that is on the loose side, and the chain-type mixing and stirring blade is Within the width dimension, the shaft member of the mounting angle adjusting mechanism and the column, motor, driving wheel and driven wheel of the mixing and stirring head are arranged so as to overlap each other.

同様に、重量バランスに基づく姿勢安定性を考慮した別の好ましい態様としては、前記取付角調整機構の固定板と可動板は共に水平で且つ互いに平行であって、前記混合撹拌ヘッドの平面視において、張り側となる前記チェーン式の混合撹拌翼と緩み側となる前記チェーン式の混合撹拌翼とで挟まれた領域であって且つ前記チェーン式の混合撹拌翼の幅寸法内に納まるように、前記取付角調整機構の固定板および可動板の大きさがそれぞれ設定されている。   Similarly, as another preferable aspect considering posture stability based on weight balance, the fixed plate and the movable plate of the mounting angle adjusting mechanism are both horizontal and parallel to each other, and in the plan view of the mixing and stirring head The chain-type mixing agitating blade on the tension side and the chain-type mixing agitating blade on the loose side are sandwiched between the chain-type mixing agitating blade and within the width dimension of the chain-type mixing agitating blade, The sizes of the fixed plate and the movable plate of the mounting angle adjusting mechanism are set.

改良壁体を構築する際の負荷を考慮した別の好ましい態様としては、前記取付角調整機構は、前記可動板を含む混合撹拌ヘッドの前記固定板からの脱落を防止する脱落防止機構を備えている。   As another preferable aspect in consideration of the load when the improved wall is constructed, the mounting angle adjusting mechanism includes a drop prevention mechanism for preventing the mixing and stirring head including the movable plate from dropping from the fixed plate. Yes.

より具体的な好ましい態様としては、前記取付角調整機構の軸部材が前記脱落防止機構の一部を兼ねていて、前記脱落防止機構は、前記固定板と可動板の中心部をそれぞれに貫通した前記軸部材の両端部に、それぞれの貫通穴からの前記軸部材の抜け出しを阻止する抜け止め部材を不離一体に設けてある。   As a more specific preferable aspect, the shaft member of the mounting angle adjusting mechanism also serves as a part of the drop-off prevention mechanism, and the drop-off prevention mechanism penetrates the center portions of the fixed plate and the movable plate, respectively. At both ends of the shaft member, a retaining member for preventing the shaft member from coming out of each through hole is provided in an integral manner.

使い勝手の良さに着目した場合の別の好ましい態様としては、前記取付角調整機構は、前記固定板が前記ベースマシンのアームの先端部に対して着脱可能で、且つ前記可動板が前記混合撹拌ヘッドの上端部に対して着脱可能な中間ブラケット式のものとして形成されている。   As another preferable aspect when attention is paid to usability, the mounting angle adjusting mechanism is configured such that the fixed plate is detachable with respect to the tip of the arm of the base machine, and the movable plate is the mixing and stirring head. It is formed as an intermediate bracket type that can be attached to and detached from the upper end of the.

その一方で、構造のさらなる簡素化と共に、前記取付角調整機構と混合撹拌ヘッドとの連結部での堅牢性に着目した場合の別の好ましい態様としては、前記取付角調整機構は、前記固定板が前記ベースマシンのアームの先端部に対して着脱可能で、且つ前記可動板が前記混合撹拌ヘッドの上端部に対して一体的に結合されている。   On the other hand, as a further preferable aspect when paying attention to the robustness at the connecting portion between the mounting angle adjusting mechanism and the mixing and stirring head as well as further simplification of the structure, the mounting angle adjusting mechanism includes the fixing plate. Is removable from the tip of the arm of the base machine, and the movable plate is integrally coupled to the upper end of the mixing and stirring head.

また、前記地盤改良装置を用いて行う改良壁体の構築方法の好ましい態様として、前記取付角調整機構の機能により、前記平面中心線と前記ベースマシンの平面視でのブームおよびアームの中心線とのなす角度を鋭角に保った上で、前記混合撹拌ヘッドを前記平面中心線方向に掘進させて鉛直な改良壁体を構築する。   Moreover, as a preferable aspect of the construction method of the improved wall body performed using the ground improvement device, the plane center line and the center line of the boom and the arm in a plan view of the base machine are obtained by the function of the mounting angle adjusting mechanism. The vertical stirring wall body is constructed by digging the mixing and stirring head in the direction of the plane center line.

なお、前記平面中心線と前記ベースマシンの平面視でのブームおよびアームの中心線とのなす角度の最小角度は、本発明者等の実験に基づく知見よりして１５°程度である。   Note that the minimum angle formed by the plane center line and the center line of the boom and arm in plan view of the base machine is about 15 ° based on knowledge based on experiments by the inventors.

本発明によれば、取付角調整機構の高さ寸法を初めとしてその形状および重量が小さくなって、取付角調整機構を含む混合撹拌ヘッドの使い勝手が良好なものとなり、ベースマシンの姿勢の不安定さを招くことなく安定して施工を行えるようになる。   According to the present invention, the shape and weight of the mounting angle adjusting mechanism, including the height dimension, are reduced, and the usability of the mixing and stirring head including the mounting angle adjusting mechanism is improved and the posture of the base machine is unstable. Construction can be performed stably without incurring any problems.

また、平面視にて構築すべき改良壁体の厚み寸法を二分する平面中心線とベースマシンの平面視でのブームおよびアームの中心線とのなす角度が鋭角となるような姿勢にてベースマシンを構えて、ブームおよびアームの揺動動作方向に力に基づく上記平面中心線方向の分力を当該平面中心線方向への掘進ベクトルとして混合撹拌ヘッドを掘進させる場合において、特に狭隘な現場においても無理なく施工することが可能となる。   Also, the base machine should be in such a posture that the angle formed by the plane center line that bisects the thickness of the improved wall to be constructed in plan view and the center line of the boom and arm in plan view of the base machine is an acute angle. In the case where the mixing agitation head is dug using the component force in the plane center line direction based on the force in the swinging movement direction of the boom and arm as a vector for digging in the plane center line direction. It becomes possible to construct without difficulty.

本発明に係る地盤改良装置の第１の実施の形態を示す図で、地盤改良装置を用いた改良壁体の構築状況を示す側面説明図。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st Embodiment of the ground improvement apparatus which concerns on this invention, and is side explanatory drawing which shows the construction condition of the improvement wall body using a ground improvement apparatus. 図１の平面図。The top view of FIG. 図１に示した地盤改良装置を拡大して混合撹拌翼の周回移動面側から見た側面説明図。Side surface explanatory drawing which expanded the ground improvement apparatus shown in FIG. 1 and was seen from the circumference moving surface side of a mixing stirring blade. 図３の左側面図。FIG. 4 is a left side view of FIG. 3. 図３に示した混合撹拌ヘッドの上端部の拡大図。The enlarged view of the upper end part of the mixing stirring head shown in FIG. 図５の平面図。FIG. 6 is a plan view of FIG. 5. 図３のａ−ａ線に沿った拡大断面図。The expanded sectional view along the aa line of FIG. 図７の混合撹拌翼で囲まれた領域にハンチングを施して強調した説明図。FIG. 8 is an explanatory diagram emphasizing and emphasizing a region surrounded by the mixing stirring blade in FIG. 7. （Ａ）は図５に示した軸部材周りの拡大断面図、（Ｂ）は同図（Ａ）の下面図。(A) is an expanded sectional view around the shaft member shown in FIG. 5, (B) is a bottom view of FIG. 図６に示した固定板の要部拡大図。The principal part enlarged view of the fixing plate shown in FIG. 図５に示した軸部材周りの構造の別の例を示す図で、（Ａ）は図９の（Ａ）と同等部位の拡大断面図、（Ｂ）は図９の（Ｂ）と同等部位の下面図。9A and 9B are views showing another example of the structure around the shaft member shown in FIG. 5, in which FIG. 9A is an enlarged cross-sectional view equivalent to FIG. 9A and FIG. 9B is equivalent to FIG. 9B. FIG. 図５に示した軸部材周りの構造のさらに別の例を示す図で、（Ａ）は図９の（Ａ）と同等部位の拡大断面図、（Ｂ）は図９の（Ｂ）と同等部位の下面図。9A and 9B are views showing still another example of the structure around the shaft member shown in FIG. 5, in which FIG. 9A is an enlarged cross-sectional view of the same portion as FIG. 9A, and FIG. 9B is equivalent to FIG. The bottom view of a part. 両側を家屋等で挟まれた狭隘な街区道路での改良壁体の構築のための施工状況を示す平面図。The top view which shows the construction condition for construction of the improved wall body in the narrow block road where both sides were sandwiched between houses. 図１３での施工に際しての図６に示した取付角調整機構の機能を示す平面図。The top view which shows the function of the attachment angle adjustment mechanism shown in FIG. 6 at the time of construction in FIG. 本発明に係る地盤改良装置の第２の実施の形態を示す図で、図５と同等部位の拡大図。It is a figure which shows 2nd Embodiment of the ground improvement apparatus which concerns on this invention, and is an enlarged view of a site | part equivalent to FIG.

図１〜１４は本発明に係る地盤改良装置を実施するためのより具体的な第１の形態を示していて、特に図１〜４は地盤改良装置の基本構造を示している。すなわち、図１は地盤改良装置を用いた改良壁体の構築状況を示す側面説明図であり、図２は図１の平面図を示している。   FIGS. 1-14 has shown the more concrete 1st form for implementing the ground improvement apparatus which concerns on this invention, Especially FIGS. 1-4 has shown the basic structure of the ground improvement apparatus. That is, FIG. 1 is a side explanatory view showing a construction state of the improved wall body using the ground improvement device, and FIG. 2 is a plan view of FIG.

図１，２において、１は汎用型の建設機械の一つである無限軌道（履帯）式またはクローラ式のショベル系掘削機械、例えば履帯２を有する油圧ショベルもしくはバックホウ等のベースマシン（母機）であって、ベースマシン１の上部旋回体としての旋回ベース３に搭載された揺動式（起伏式または起倒式）のブーム４の先端には同じく揺動式のアーム５が連結されている。そして、ベースマシン１におけるアーム５の先端には、アタッチメントとして原位置土の掘削と固化材（地盤改良材）との混合撹拌のためのいわゆるトレンチャー式の混合撹拌ヘッド６が後述する中間ブラケット方式の取付角調整機構７を介して着脱可能に装着されている。   1 and 2, reference numeral 1 denotes an endless track (crawler) or crawler excavator excavating machine which is one of general-purpose construction machines, for example, a base machine (base machine) such as a hydraulic excavator having a crawler 2 or a backhoe. A swinging arm 5 is also connected to the tip of a swinging (undulation or tilting) boom 4 mounted on a swinging base 3 as an upper swinging body of the base machine 1. At the tip of the arm 5 in the base machine 1, a so-called trencher type mixing agitation head 6 for excavating the original soil as an attachment and mixing agitation with the solidified material (ground improvement material) is an intermediate bracket type which will be described later. The mounting angle adjustment mechanism 7 is detachably mounted.

なお、８はブーム４の揺動動作のためのブームシリンダ、９はアーム５の揺動動作のためのアームシリンダ、１０はアタッチメントである混合撹拌ヘッド６の揺動動作のためのアタッチメントシリンダである。また、Ｂはいわゆる地中連続壁の形態で鉛直姿勢にて構築しようとする改良壁体である。   Note that 8 is a boom cylinder for swinging the boom 4, 9 is an arm cylinder for swinging the arm 5, and 10 is an attachment cylinder for swinging the mixing and stirring head 6, which is an attachment. . Moreover, B is an improved wall body to be constructed in a vertical posture in the form of a so-called underground continuous wall.

ここでは、図２において、便宜上、改良壁体Ｂの平面視においてその改良壁体Ｂの厚み寸法を二分する中心線を改良壁体Ｂまたは構築すべき改良壁体Ｂの平面中心線Ｃ１と定義する。同様に、ベースマシン１の平面視でのブーム４およびアーム５の中心線をブーム４等の平面中心線Ｃ２と定義するものとする。   Here, in FIG. 2, for the sake of convenience, the center line that bisects the thickness dimension of the improved wall B in the plan view of the improved wall B is defined as the improved wall B or the plane center line C1 of the improved wall B to be constructed. To do. Similarly, the center line of the boom 4 and the arm 5 in a plan view of the base machine 1 is defined as a plane center line C2 of the boom 4 or the like.

図３は図１に示した地盤改良装置を拡大して混合撹拌翼の周回移動面側から見た側面説明図であり、図４は図３の右側面図を示している。   3 is an enlarged side view of the ground improvement device shown in FIG. 1 as seen from the circumferential moving surface side of the mixing stirring blade, and FIG. 4 is a right side view of FIG.

これらの図３，４に示すように、混合撹拌ヘッド６は、剛性の高いフレーム１１を本体部（母体）としていて、このフレーム１１は、幅広で且つ略二股状のヨーク部１２と、ヨーク部１２の下部に連結された真直で四角柱状の支柱としてのポスト部１３とから構成されている。ヨーク部１２の上端の固定側リンクプレート１４は、後述する図５に示すような取付角調整機構７を介してアーム５の先端に着脱可能に連結される。なお、支柱としてのポスト部１３は四角柱状のものに限らず、四角柱以外の多角柱状や円柱状のものであっても良い。   As shown in FIGS. 3 and 4, the mixing and agitation head 6 has a rigid frame 11 as a main body (matrix). The frame 11 includes a wide and substantially bifurcated yoke portion 12 and a yoke portion. 12 and a post portion 13 as a straight quadrangular pillar-like support connected to a lower portion of the post. The fixed link plate 14 at the upper end of the yoke portion 12 is detachably connected to the tip of the arm 5 via an attachment angle adjusting mechanism 7 as shown in FIG. In addition, the post part 13 as a support | pillar is not restricted to a quadrangular prism shape, but may be a polygonal column shape other than the quadrangular column shape or a cylindrical shape.

そして、ポスト部１３の上部に設けた油圧モータ１５駆動の例えばチェーンスプロケットタイプの駆動輪１６（図５参照）と同じくポスト部１３の下部に設けた従動輪１７との間にエンドレス（無端状）のドライブチェーン１８を巻き掛けてある。ドライブチェーン１８には、当該ドライブチェーン１８の長手方向とほぼ直交するように、図３に示す幅寸法Ｗの複数の混合撹拌翼１９を略等ピッチで装着してある。これらの複数の混合撹拌翼１９がドライブチェーン１８とともに上下方向に周回駆動されることになる。   And, for example, a chain sprocket type driving wheel 16 (see FIG. 5) driven by the hydraulic motor 15 provided at the upper part of the post part 13 and a driven wheel 17 provided at the lower part of the post part 13 are endless (endless). The drive chain 18 is wound around. A plurality of mixing and stirring blades 19 having a width W shown in FIG. 3 are mounted on the drive chain 18 at substantially equal pitches so as to be substantially orthogonal to the longitudinal direction of the drive chain 18. The plurality of mixing agitating blades 19 are driven to rotate around the drive chain 18 in the vertical direction.

なお、混合撹拌翼１９にはその長手方向に沿って複数の掘削刃であるカッタービット２０（図５参照）を設けてある。また、ドライブチェーン１８は、ポスト部１３に設けた複数のガイドローラ２３に所定の張力が付与された状態で案内・支持されている。   The mixing stirring blade 19 is provided with a plurality of cutter bits 20 (see FIG. 5) along the longitudinal direction. The drive chain 18 is guided and supported in a state where a predetermined tension is applied to a plurality of guide rollers 23 provided on the post portion 13.

さらに、ポスト部１３の先端部（下端部）には吐出ノズル２１を設けてあり、この吐出ノズル２１には例えば水と固化材としての粉体状のセメントとを予め混ぜ合わせたスラリ状の固化材が図示外の圧送ポンプと配管２２を介して圧送されるようになっている。これにより、吐出ノズル２１から地中に向けてスラリ状の固化材を吐出・噴射することが可能となっている。   Further, a discharge nozzle 21 is provided at the front end (lower end) of the post portion 13, and the discharge nozzle 21 is a solidified slurry in which, for example, water and powdered cement as a solidifying material are mixed in advance. The material is pumped through a pumping pump and a pipe 22 (not shown). Thereby, it is possible to discharge and inject the slurry-like solidified material from the discharge nozzle 21 toward the ground.

図５は図３に示した混合撹拌ヘッド６の上端部の拡大図を示し、図６は図５の平面図を示している。また、図７は図３のａ−ａ線に沿った拡大断面図を示している。   FIG. 5 shows an enlarged view of the upper end portion of the mixing and stirring head 6 shown in FIG. 3, and FIG. 6 shows a plan view of FIG. FIG. 7 shows an enlarged cross-sectional view along the line aa in FIG.

図５に示すように、ベースマシン１のアーム５と混合撹拌ヘッド６との間に介装された取付角調整機構７は、アーム５側となるアーム側ブラケット２６と、混合撹拌ヘッド６側となるヘッド側ブラケット２７とを主要素として構成されていて、後述するように両者は相対回転可能に連結されている。   As shown in FIG. 5, the mounting angle adjusting mechanism 7 interposed between the arm 5 of the base machine 1 and the mixing and stirring head 6 includes an arm-side bracket 26 on the arm 5 side, a mixing and stirring head 6 side, The head side bracket 27 is configured as a main element, and both are coupled so as to be relatively rotatable as will be described later.

アーム側ブラケット２６は基板となる円板状の固定板２８に所定距離隔てて一対のリンクプレート２９を立設したものである。他方、ヘッド側ブラケット２７も基板となる円板状の可動板３０上に下向きに立設した一対のリンクプレート３１がアーム側ブラケット２６のリンクプレート２９に対して９０°位相がずれている点を除き、アーム側ブラケット２６とほぼ同構造のものとなっている。   The arm side bracket 26 has a pair of link plates 29 erected at a predetermined distance from a disk-shaped fixing plate 28 serving as a substrate. On the other hand, the pair of link plates 31 erected downward on the disc-shaped movable plate 30 serving as the substrate also has a 90 ° phase shift with respect to the link plate 29 of the arm side bracket 26. Except for this, the arm side bracket 26 has substantially the same structure.

そして、アーム側ブラケット２６の固定板２８とヘッド側ブラケット２７の可動板３０とは、共に水平で且つ互いに平行であって、それら両者が互いに密着するように重ね合わせた上で、固定板２８と可動板３０の中心部を貫通する中空円筒状の軸部材３２を介してアーム側ブラケット２６とヘッド側ブラケット２７とが相対回転可能に連結されている。この軸部材３２の中心は、図６，７に示すように、混合撹拌ヘッド６のフレーム１１を構成している四角柱状のポスト部１３の中心線の延長線上に位置している。なお、アーム側ブラケット２６の固定板２８とヘッド側ブラケット２７の可動板３０の水平度および両者の平行度について、多少の誤差はそれぞれ許容される。   The fixed plate 28 of the arm side bracket 26 and the movable plate 30 of the head side bracket 27 are both horizontal and parallel to each other, and are stacked so that they are in close contact with each other. The arm-side bracket 26 and the head-side bracket 27 are connected to each other via a hollow cylindrical shaft member 32 that passes through the center of the movable plate 30 so as to be relatively rotatable. As shown in FIGS. 6 and 7, the center of the shaft member 32 is positioned on an extension line of the center line of the square columnar post portion 13 constituting the frame 11 of the mixing and stirring head 6. It should be noted that some errors are allowed in the horizontality and parallelism of the fixed plate 28 of the arm side bracket 26 and the movable plate 30 of the head side bracket 27.

また、アーム側ブラケット２６の固定板２８とヘッド側ブラケット２７の可動板３０とを貫通した軸部材３２の両端部には、軸部材３２よりも大径のリング状の抜け止め部材３５が嵌め合わされた上で溶接固定されている。この抜け止め部材３５は、図９に示すように、リング状の抜け止めフランジ３５ａの周囲に補強を目的とした複数のリブ３５ｂを溶接固定したもので、抜け止めフランジ３５ａおよび複数のリブ３５ｂ共に軸部材３２に溶接固定される。   A ring-shaped retaining member 35 having a larger diameter than the shaft member 32 is fitted to both ends of the shaft member 32 that penetrates the fixed plate 28 of the arm side bracket 26 and the movable plate 30 of the head side bracket 27. It is fixed by welding. As shown in FIG. 9, the retaining member 35 is formed by welding and fixing a plurality of ribs 35b for the purpose of reinforcement around a ring-shaped retaining flange 35a. Both the retaining flange 35a and the plurality of ribs 35b The shaft member 32 is fixed by welding.

その上で、アーム側ブラケット２６の固定板２８とヘッド側ブラケット２７の可動板３０の周縁部にそれぞれに形成された図１０に示す多数のボルト穴３３にそれぞれに挿入される締結固定手段としてのボルト・ナット３６を介して両者が締結固定されるようになっている。これにより、軸部材３２は、取付角調整機構７の一構成要素として、アーム側ブラケット２６とヘッド側ブラケット２７との相対回転を許容する軸体として機能しつつ、同時に当該軸部材３２の両端部に溶接固定される抜け止め部材３５と共に脱落防止機構５０を形成している。また、多数のボルト・ナット３６による締結力を解除するならば、軸部材３２を回転中心としたアーム側ブラケット２６の固定板２８とヘッド側ブラケット２７の可動板３０との相対回転が可能となっている。   In addition, as a fastening and fixing means to be inserted into each of a large number of bolt holes 33 shown in FIG. 10 formed on the periphery of the fixed plate 28 of the arm side bracket 26 and the movable plate 30 of the head side bracket 27, respectively. Both of them are fastened and fixed via bolts and nuts 36. Thus, the shaft member 32 functions as a shaft body that allows relative rotation between the arm side bracket 26 and the head side bracket 27 as a component of the mounting angle adjusting mechanism 7, and at the same time, both end portions of the shaft member 32. A drop-off prevention mechanism 50 is formed together with a retaining member 35 that is welded and fixed to. Further, if the fastening force by a large number of bolts and nuts 36 is released, relative rotation between the fixed plate 28 of the arm side bracket 26 and the movable plate 30 of the head side bracket 27 is possible with the shaft member 32 as the rotation center. ing.

なお、アーム側ブラケット２６の固定板２８とヘッド側ブラケット２７の可動板３０との相対回転に備えて、図９に示すように、固定板２８および可動板３０と各抜け止め部材３５の抜け止めフランジ３５ａとの間には微少な隙間を確保してある。また、図９に示した抜け止め部材３５に代えて、図１１，１２に示した抜け止め部材３９，４０を用いることも可能である。図１１に示した抜け止め部材３９は、実質的に図９に示した抜け止めフランジ３５ａを廃止して、複数のリブ３５ｂのみとしたものである。また、図１２に示した抜け止め部材４０は、実質的に図９に示した複数のリブ３５ｂを廃止して、抜け止めフランジ３５ａのみとしたものである。   In preparation for the relative rotation of the fixed plate 28 of the arm side bracket 26 and the movable plate 30 of the head side bracket 27, as shown in FIG. 9, the fixed plate 28, the movable plate 30, and the retaining members 35 are prevented from coming off. A minute gap is secured between the flange 35a. Further, the retaining members 39 and 40 shown in FIGS. 11 and 12 may be used in place of the retaining member 35 shown in FIG. The retaining member 39 shown in FIG. 11 substantially eliminates the retaining flange 35a shown in FIG. 9 and has only a plurality of ribs 35b. Further, the retaining member 40 shown in FIG. 12 substantially eliminates the plurality of ribs 35b shown in FIG. 9 and has only the retaining flange 35a.

ここで、図１０に拡大して示すように、固定板２８と可動板３０の双方に形成されている複数のボルト穴３３はそれぞれが固定板２８および可動板３０の円周方向に長い長穴状のものとなっている。そして、それぞれのボルト穴３３の長径方向の長さｇに比べて、隣り合うボルト穴３３同士の間に残されたブリッジ部３３ａの長さｈの方が小さくなるように、ｇ＞ｈの関係に設定さている。なお、双方の長さｇ，ｈ共に、長穴状のボルト穴３３の長手方向両端での円弧の中心間距離を示している。これにより、アーム側ブラケット２６に対するヘッド側ブラケット２７との微細な角度調整が可能となっている。   Here, as shown in an enlarged view in FIG. 10, the plurality of bolt holes 33 formed in both the fixed plate 28 and the movable plate 30 are elongated holes that are long in the circumferential direction of the fixed plate 28 and the movable plate 30. It has become a shape. Then, the relationship of g> h is set so that the length h of the bridge portion 33a left between the adjacent bolt holes 33 is smaller than the length g of each bolt hole 33 in the major axis direction. Is set. Both the lengths g and h indicate the distance between the centers of the arcs at both ends in the longitudinal direction of the elongated hole 33. Thereby, a fine angle adjustment with the head side bracket 27 with respect to the arm side bracket 26 is possible.

さらに、アーム側ブラケット２６のリンクプレート２９はアーム５および当該アーム５側のリンク部材５ａに対して連結ピン３４により着脱可能に連結されるとともに、ヘッド側ブラケット２７のリンクプレート３１は混合撹拌ヘッド６側の上端部の固定側リンクプレート１４に対して連結ピン３８により着脱可能に連結される。   Further, the link plate 29 of the arm side bracket 26 is detachably connected to the arm 5 and the link member 5a on the arm 5 side by a connecting pin 34, and the link plate 31 of the head side bracket 27 is connected to the mixing and stirring head 6. The connecting pin 38 is detachably connected to the fixed link plate 14 at the upper end on the side.

なお、混合撹拌ヘッド６の固定側リンクプレート１４はアーム側ブラケット２６のリンクプレート２９と共通化されており、取付角調整機構７を使用しない場合には、混合撹拌ヘッド６の固定側リンクプレート１４を連結ピン３４または３８を介して直接的にアーム５側に連結することが可能となっている。   The fixed side link plate 14 of the mixing and stirring head 6 is shared with the link plate 29 of the arm side bracket 26. When the mounting angle adjusting mechanism 7 is not used, the fixed side link plate 14 of the mixing and stirring head 6 is used. Can be directly connected to the arm 5 side via the connecting pin 34 or 38.

ここで、図５，６に示すように、混合撹拌ヘッド６の構成要素と取付角調整機構７の構成要素との配置にあたって、混合撹拌ヘッド６における四角柱状のポスト部１３の中心線の延長線上に、取付角調整機構７の軸部材３２の中心が一致するように配置してあることは先に述べた通りである。   Here, as shown in FIGS. 5 and 6, in arranging the components of the mixing and stirring head 6 and the components of the mounting angle adjusting mechanism 7, on the extension line of the center line of the square columnar post portion 13 in the mixing and stirring head 6. In addition, as described above, the shaft members 32 of the mounting angle adjusting mechanism 7 are arranged so that the centers thereof coincide with each other.

また、図５のほか図６，７に示した混合撹拌ヘッド６の平面図および断面図において、混合撹拌翼１９が装着されているドライブチェーン１８の張り側での混合撹拌翼１９の周回移動面と、同じくドライブチェーン１８の緩み側での混合撹拌翼１９の周回移動面とで挟まれた領域であって、且つ混合撹拌翼１９の幅寸法Ｗ（図３参照）の領域内に納まるように、取付角調整機構７の固定板２８および可動板３０のそれぞれの大きさが設定されている。   In addition to FIG. 5, in the plan view and cross-sectional view of the mixing and stirring head 6 shown in FIGS. 6 and 7, the orbital moving surface of the mixing and stirring blade 19 on the tight side of the drive chain 18 to which the mixing and stirring blade 19 is attached. And a region sandwiched between the circumferentially moving surfaces of the mixing and stirring blade 19 on the loose side of the drive chain 18 and within the region of the width W of the mixing and stirring blade 19 (see FIG. 3). The sizes of the fixed plate 28 and the movable plate 30 of the mounting angle adjusting mechanism 7 are set.

同様に、取付角調整機構７を含む混合撹拌ヘッド６の平面視において、上記領域内に納まるように、取付角調整機構７の軸部材３２と、図３〜５に示した混合撹拌ヘッド６のポスト部１３、油圧モータ１５、駆動輪１６および従動輪１７のそれぞれが重なり合うように配置されている。つまり、取付角調整機構７を含む混合撹拌ヘッド６の平面視において、油圧モータ１５の中心と駆動輪１６および従動輪１７のそれぞれの回転中心とが一致していて、それらの中心線上で交差するかたちで取付角調整機構７の軸部材３２の中心が位置している。   Similarly, in a plan view of the mixing and stirring head 6 including the mounting angle adjusting mechanism 7, the shaft member 32 of the mounting angle adjusting mechanism 7 and the mixing and stirring head 6 shown in FIGS. The post portion 13, the hydraulic motor 15, the drive wheel 16, and the driven wheel 17 are arranged so as to overlap each other. That is, in the plan view of the mixing and stirring head 6 including the mounting angle adjusting mechanism 7, the center of the hydraulic motor 15 coincides with the rotation center of each of the driving wheel 16 and the driven wheel 17 and intersects on the center line. The center of the shaft member 32 of the mounting angle adjusting mechanism 7 is located in the form.

すなわち、混合撹拌翼１９が装着されているドライブチェーン１８の張り側での混合撹拌翼１９の周回移動面と同じくドライブチェーン１８の緩み側での混合撹拌翼１９の周回移動面とで挟まれた領域であって、且つ混合撹拌翼１９の幅寸法Ｗの領域とは、図８にハッチング（斜線）を施した領域Ｅである。この領域Ｅ内に納まるように、取付角調整機構７の固定板２８および可動板３０のそれぞれの大きさが設定されている。同時に、領域Ｅ内に納まるように、取付角調整機構７の軸部材３２と、混合撹拌ヘッド６のポスト部１３、油圧モータ１５、駆動輪１６および従動輪１７のそれぞれが平面視にて重なり合うように配置されている。   That is, it is sandwiched between the circumferential moving surface of the mixing stirring blade 19 on the tight side of the drive chain 18 to which the mixing stirring blade 19 is mounted and the circumferential moving surface of the mixing stirring blade 19 on the loose side of the drive chain 18. The region and the region of the width W of the mixing and stirring blade 19 is a region E in which hatching (hatched lines) is given in FIG. The sizes of the fixed plate 28 and the movable plate 30 of the mounting angle adjusting mechanism 7 are set so as to be within this region E. At the same time, the shaft member 32 of the mounting angle adjusting mechanism 7 and the post portion 13 of the mixing and stirring head 6, the hydraulic motor 15, the driving wheel 16 and the driven wheel 17 are overlapped in plan view so as to be within the region E. Is arranged.

このような取付角調整機構７を用いることにより、固定板２８と可動板３０とを締結固定している多数のボルト・ナット３６の脱着を行って、固定板２８に対して可動板３０を任意の角度だけ回転させれば、取付角調整機構７におけるアーム側ブラケット２６とヘッド側ブラケット２７とのなす角度、ひいては図２に示した改良壁体Ｂの平面中心線Ｃ１とブーム４等の平面中心線Ｃ２とのなす角度θを任意の角度に設定することが可能である。   By using such a mounting angle adjusting mechanism 7, a large number of bolts and nuts 36 that fasten and fix the fixed plate 28 and the movable plate 30 are detached, and the movable plate 30 can be arbitrarily attached to the fixed plate 28. 2, the angle formed by the arm side bracket 26 and the head side bracket 27 in the mounting angle adjusting mechanism 7, and the plane center line C 1 of the improved wall B shown in FIG. 2 and the plane center of the boom 4, etc. The angle θ formed with the line C2 can be set to an arbitrary angle.

なお、図２では改良壁体Ｂの平面中心線Ｃ１とブーム４等の平面中心線Ｃ２とのなす角度θがθ＝９０°である。これに対して、後述する図１３では、取付角調整機構７の自由度を使って、改良壁体Ｂの平面中心線Ｃ１とベースマシン１のブーム４等の平面中心線Ｃ２とのなす角度θを１５°程度に設定した上での施工状況を示している。   In FIG. 2, the angle θ formed by the plane center line C1 of the improved wall B and the plane center line C2 of the boom 4 or the like is θ = 90 °. On the other hand, in FIG. 13 to be described later, the angle θ formed by the plane center line C1 of the improved wall B and the plane center line C2 of the boom 4 of the base machine 1 using the degree of freedom of the mounting angle adjusting mechanism 7. This shows the construction status after setting the angle to about 15 °.

また、図５に示した取付角調整機構７には、軸部材３２と抜け止め部材３５とからなる脱落防止機構５０が付加されていることにより、アーム側ブラケット２６の固定板２８とヘッド側ブラケット２７の可動板３０とを締結固定している多数ボルト・ナット３６の全てが仮に脱落したとしても、アーム側ブラケット２６の固定板２８とヘッド側ブラケット２７の可動板３０とが切り離されることがないように、つまり、アーム側ブラケット２６とヘッド側ブラケット２７とが脱落防止機構５０により実質的に不離一体に連結されていて、アーム側ブラケット２６からのヘッド側ブラケット２７の脱落が阻止される構造となっている。これにより、例えば過負荷によるトラブル発生の抑制化と安全性の向上が図られている。   Further, the mounting angle adjusting mechanism 7 shown in FIG. 5 is provided with a drop-off preventing mechanism 50 including a shaft member 32 and a retaining member 35, so that the fixing plate 28 of the arm side bracket 26 and the head side bracket Even if all of the multiple bolts and nuts 36 that fasten and fix the 27 movable plates 30 are removed, the fixed plate 28 of the arm side bracket 26 and the movable plate 30 of the head side bracket 27 are not separated. That is, in other words, the arm side bracket 26 and the head side bracket 27 are substantially non-separably connected by the drop prevention mechanism 50, and the head side bracket 27 is prevented from dropping off from the arm side bracket 26. It has become. Thereby, for example, the occurrence of trouble due to overload is suppressed and the safety is improved.

言い換えるならば、図５に示した多数のボルト・ナット３６は、アーム側ブラケット２６とヘッド側ブラケット２７との相対回転位置を規制しつつ両者を位置決めして締結固定する機能を有している。その一方、脱落防止機構５０は、アーム側ブラケット２６とヘッド側ブラケット２７との相対回転自由度を確保しつつ、上記ボルト・ナット３６に依存することなく、アーム側ブラケット２６とヘッド側ブラケット２７とを実質的に不離一体に連結して、両者の切り離し（アーム側ブラケット２６からのヘッド側ブラケット２７の脱落）を防止する機能を有している。   In other words, the large number of bolts and nuts 36 shown in FIG. 5 have a function of positioning and fixing them while regulating the relative rotational positions of the arm side bracket 26 and the head side bracket 27. On the other hand, the drop-off prevention mechanism 50 secures a relative degree of freedom of rotation between the arm side bracket 26 and the head side bracket 27, and does not depend on the bolt / nut 36, and the arm side bracket 26, the head side bracket 27, and the like. Are connected to each other substantially in a separated manner so as to prevent them from being separated (the head side bracket 27 is not dropped from the arm side bracket 26).

また、上記取付角調整機構７の構造として、アーム側ブラケット２６に対しヘッド側ブラケット２７を、円筒状の軸部材３２を回転中心として任意の角度に回転させた後、多数のボルト・ナット３６にて締結固定する構造としていることにより、例えば特許文献１の図５，６に開示されているようなモータ駆動方式のものと比べて、駆動部のトラブルが少なく取付角調整機構７の構造を簡素化できるとともに、堅牢性および耐久性にも優れたものとなる。   Further, as the structure of the mounting angle adjusting mechanism 7, the head side bracket 27 is rotated with respect to the arm side bracket 26 at an arbitrary angle with the cylindrical shaft member 32 as the rotation center, and then a large number of bolts and nuts 36 are formed. Therefore, the structure of the mounting angle adjusting mechanism 7 is simpler than that of a motor driving system as disclosed in FIGS. As well as excellent robustness and durability.

加えて、図８に示したように、ハッチングを施した領域Ｅ内に納まるように、取付角調整機構７の固定板２８および可動板３０の大きさが設定されていて、同時に、領域Ｅ内に納まるように、取付角調整機構７の軸部材３２と、混合撹拌ヘッド６のポスト部１３、油圧モータ１５、駆動輪１６および従動輪１７のそれぞれが重なり合うように配置されている。これは、例えば施工条件によっては、ベースマシン１のアーム５の先端部までも混合撹拌された安定処理土内に埋没させて施工することがあり、固定板２８や可動板３０が原地盤と干渉して混合撹拌ヘッド６の掘進が困難となることがあることから、このような事態を避ける上で上記の各要素の配置は有効である。加えて、上記の各要素の配置のもとでは、ベースマシン１のアーム５から混合撹拌ヘッド６が吊り下げ支持される際の重量バランスに基づく姿勢安定性が良く、例えば混合撹拌ヘッド６を地中から引き抜いた上で移動させる際の機動性にも優れたものとなる。   In addition, as shown in FIG. 8, the sizes of the fixed plate 28 and the movable plate 30 of the mounting angle adjusting mechanism 7 are set so as to be within the hatched region E. The shaft member 32 of the mounting angle adjusting mechanism 7 and the post portion 13 of the mixing and stirring head 6, the hydraulic motor 15, the driving wheel 16, and the driven wheel 17 are arranged so as to overlap each other. For example, depending on the construction conditions, the tip of the arm 5 of the base machine 1 may be buried in the stabilized soil that has been mixed and stirred, and the fixed plate 28 and the movable plate 30 may interfere with the original ground. Since the mixing stirring head 6 may be difficult to dig, the arrangement of the above elements is effective in avoiding such a situation. In addition, under the arrangement of each element described above, the posture stability based on the weight balance when the mixing and stirring head 6 is suspended and supported from the arm 5 of the base machine 1 is good. It will also have excellent maneuverability when moving after being pulled out from inside.

このような構造の混合撹拌ヘッド６を用いて改良壁体Ｂの構築のための施工を行う場合、一般的には、図１，２に示すように、構築しようとする鉛直な改良壁体Ｂの長手方向とベースマシン１の履帯２を平行にセットする。ただし、従来の一般的な工法では、上記取付角調整機構７による回転自由度は有していない。その上で、油圧モータ１５の正転または逆転駆動により、ドライブチェーン１８とともに複数の混合撹拌翼１９を上下方向に周回駆動させる。さらに、混合撹拌ヘッド６全体を例えばブーム４やアーム５の揺動力（揺動動作方向の力）を利用して直立姿勢にて地中に貫入する。そして、吐出ノズル２１からスラリ状の固化材を吐出しながら、ベースマシン１を構築しようとする改良壁体Ｂと平行に横行移動させて、混合撹拌ヘッド６を掘進させることになる。   When the construction for constructing the improved wall body B is performed using the mixed stirring head 6 having such a structure, generally, the vertical improved wall body B to be constructed is constructed as shown in FIGS. And the crawler belt 2 of the base machine 1 are set in parallel. However, the conventional general construction method does not have the degree of freedom of rotation by the mounting angle adjusting mechanism 7. Then, the plurality of mixing agitating blades 19 are driven to rotate in the vertical direction together with the drive chain 18 by forward or reverse drive of the hydraulic motor 15. Further, the entire mixing and agitation head 6 penetrates into the ground in an upright posture by using, for example, the swinging force (force in the swinging operation direction) of the boom 4 and the arm 5. Then, while discharging the slurry-like solidified material from the discharge nozzle 21, the mixing and stirring head 6 is dug by moving in parallel with the improved wall body B to be constructed of the base machine 1.

これにより、複数の混合撹拌翼１９により掘削された原位置土が同じく複数の混合撹拌翼１９によりスラリ状の固化材と混合撹拌されて、混合撹拌ヘッド６の掘進方向後方側に連続した鉛直姿勢の改良壁体Ｂが構築されることになる。なお、地中に構築される改良壁体Ｂの壁体厚は混合撹拌翼１９の長さＷ（図３参照）とほぼ同等のものとなる。   As a result, the in-situ soil excavated by the plurality of mixing agitating blades 19 is also mixed and agitated by the plurality of mixing agitating blades 19 with the slurry-like solidified material, and the vertical posture is continuous to the rear side in the digging direction of the mixing agitating head 6. The improved wall body B is constructed. Note that the wall thickness of the improved wall body B constructed in the ground is substantially equal to the length W of the mixing and stirring blade 19 (see FIG. 3).

この場合において、混合撹拌ヘッド６におけるドライブチェーン１８の張り側と緩み側に相当する部位であって複数の混合撹拌翼１９による掘削と混合撹拌にあずかる部位、すなわち混合撹拌翼１９の上下方向での周回移動面（改良壁体Ｂの構築方向前方側に面する周回移動面と構築方向後方側に面する周回移動面）は改良壁体Ｂの構築方向と直交したものとなる。そして、改良壁体Ｂの構築方向前方側に面する周回移動面を上向きとするか下向きとするかは、地盤の硬さや土質性状に応じて決定する。   In this case, the portion corresponding to the tight side and the loose side of the drive chain 18 in the mixing and stirring head 6 and the portion that is involved in excavation and mixing and stirring by the plurality of mixing and stirring blades 19, that is, the vertical direction of the mixing and stirring blade 19. The orbiting moving surface (the orbiting moving surface facing the construction direction front side of the improved wall B and the orbiting moving surface facing the construction direction rear side) is orthogonal to the construction direction of the improving wall B. And it is determined according to the hardness and soil property of a ground whether the surrounding movement surface which faces the construction direction front side of the improved wall B is made upward or downward.

従来の一般的な改良壁体の構築方法では、図１の平面図である図２に示すように、改良壁体Ｂの平面中心線Ｃ１とベースマシン１のブーム４等の平面中心線Ｃ２とが直交するように、すなわち双方の平面中心線Ｃ１，Ｃ２同士のなす角度θが９０°となるようにセットしている。なお、図２の寸法Ｌは改良壁体Ｂの平面中心線Ｃ１からベースマシン１の旋回ベース３の旋回中心までの距離（作業半径）、寸法Ｌ1は改良壁体Ｂの側面からベースマシン１の履帯２の側面までの距離をそれぞれ示している。 In the conventional general construction method of the improved wall body, as shown in FIG. 2 which is a plan view of FIG. 1, the planar center line C1 of the improved wall body B and the planar center line C2 of the boom 4 etc. of the base machine 1 Are set so that they are perpendicular to each other, that is, the angle θ between the two plane center lines C1 and C2 is 90 °. 2 is the distance (working radius) from the plane center line C1 of the improved wall B to the turning center of the turning base 3 of the base machine 1, and the dimension L 1 is the side of the improved wall B from the base machine 1. The distance to the side surface of the crawler belt 2 is shown.

その上で、混合撹拌ヘッド６を鉛直姿勢にて地中に貫入し、改良壁体Ｂの構築方向前方側に面することになる混合撹拌翼１９の周回移動面において、その混合撹拌翼１９が例えば上方から下方に向かって周回移動するように回転駆動させることにより、改良壁体Ｂの構築方向前方側に面することになる混合撹拌翼１９の周回移動面側にて混合撹拌翼１９が積極的に原位置土を掘削して、掘削された原位置土が固化材と混合撹拌されながらそれと反対側の混合撹拌翼１９の周回移動面側に送り込まれる力を反力として、混合撹拌ヘッド６自体を改良壁体Ｂの構築方向に掘進させることになる。   Then, the mixing and stirring head 6 penetrates into the ground in a vertical posture, and the mixing and stirring blade 19 is on the circumferentially moving surface of the mixing and stirring blade 19 that faces the front side in the construction direction of the improved wall B. For example, the mixing stirring blade 19 is positively driven on the rotating surface side of the mixing stirring blade 19 that faces the front side in the construction direction of the improved wall body B by being rotationally driven so as to go around from the top to the bottom. The in-situ soil is excavated, and the mixing agitation head 6 is subjected to the reaction force of the excavated in-situ soil being mixed and agitated with the solidified material and fed to the circumferentially moving surface side of the mixing agitating blade 19 on the opposite side. It will dig itself in the direction of construction of the improved wall B.

かかる改良壁体Ｂの構築方法において、混合撹拌ヘッド６の掘進力はそれ自体の混合撹拌時の反力とベースマシン１の旋回ベース３の旋回力とによる掘進であって、その掘進力は大きな掘進力とはなり得ないものである。   In such a construction method of the improved wall B, the digging force of the mixing and agitating head 6 is digging due to the reaction force during the mixing and agitation itself and the turning force of the turning base 3 of the base machine 1, and the digging force is large. It cannot be a digging force.

そこで、本実施の形態では、基本的には、改良壁体Ｂの平面中心線Ｃ１とブーム４等の平面中心線Ｃ２となす角度θが後述する図１３に示すように鋭角となるような姿勢で混合撹拌ヘッド６を構えるものとする。これにより、ベースマシン１が本来的に有しているブーム４やアーム５およびアタッチメントシリンダ１０のシリンダ力を最大限に活用して、従来から課題となっている混合撹拌ヘッド６の掘進力の増大化を図った改良壁体の構築方法とするものである。   Therefore, in the present embodiment, basically, the attitude θ between the plane center line C1 of the improved wall B and the plane center line C2 of the boom 4 or the like is an acute angle as shown in FIG. It is assumed that the mixing and stirring head 6 is held. Thereby, the cylinder force of the boom 4 and the arm 5 and the attachment cylinder 10 inherently possessed by the base machine 1 is utilized to the maximum, thereby increasing the digging force of the mixing and stirring head 6 that has been a problem in the past. This is a method for constructing an improved wall body.

先にも述べたように、従来の一般的な改良壁体Ｂの構築方法における掘進力は、混合撹拌時の反力とベースマシン１における旋回ベース３の旋回力を掘進力とするものであって、その掘進力は小さく、硬質地盤等の掘進においてはその速度も遅く、経済スピードによる掘進は困難である。そもそも、ショベル系の掘削機の旋回力は、アーム５の先端のアタッチメントであるバケットを空中（気中）で旋回させる力があれば十分であって、大きな旋回力を必要とするものではない。その一方で、ショベル系の掘削機の掘削力は、ブームシリンダ８やアームシリンダ９（以下、アームシリンダ９等と言う。）の伸縮動作に基づくブーム４およびアーム５の揺動動作方向の力とアタッチメントシリンダ（バケットシリンダ）１０の伸縮力による掘削力に依存するものであって、ベースマシン１の規格にもよるが大きな掘削力を有している。   As described above, the digging force in the conventional general construction method of the improved wall B is the digging force based on the reaction force during mixing and stirring and the turning force of the turning base 3 in the base machine 1. Therefore, the digging force is small, and the digging of hard ground is slow, and digging at economic speed is difficult. In the first place, the turning force of the excavator excavator is sufficient if there is a force for turning the bucket, which is the attachment at the tip of the arm 5, in the air (in the air), and does not require a large turning force. On the other hand, the excavation force of the excavator excavator is the force in the swing operation direction of the boom 4 and the arm 5 based on the expansion / contraction operation of the boom cylinder 8 or the arm cylinder 9 (hereinafter referred to as the arm cylinder 9 or the like). It depends on the excavation force due to the expansion / contraction force of the attachment cylinder (bucket cylinder) 10 and has a large excavation force depending on the standard of the base machine 1.

本実施の形態では、このアームシリンダ９等のほかアタッチメントシリンダ１０の伸縮動作に基づくブーム４およびアーム５の揺動動作方向の力とアタッチメントシリンダ１０の伸縮力による掘削力を改良壁体構築方向への混合撹拌ヘッド６の掘進力（掘進ベクトル）として積極的に活用する改良壁体の構築方法である。   In the present embodiment, the force in the swing operation direction of the boom 4 and the arm 5 based on the expansion / contraction operation of the attachment cylinder 10 as well as the arm cylinder 9 and the like, and the excavation force due to the expansion / contraction force of the attachment cylinder 10 in the improved wall body construction direction. This is a method for constructing an improved wall body that is actively used as the digging force (digging vector) of the mixing and stirring head 6.

図１３は例えば両側を家屋Ｍ等で挟まれた狭隘な街区道路での改良壁体Ｂの構築のための施工状況を示す平面図である。同図に示すように、ベースマシン１の履帯２を改良壁体Ｂの構築方向と平行となるようにセットした上で、ベースマシン１における旋回ベース３の旋回中心から混合撹拌ヘッド６の回転中心までの距離（作業半径）Ｌを保ちながらベースマシン１を改良壁体Ｂの構築位置に近付ける。そうすると、平面中心線Ｃ１，Ｃ２同士のなす角度θが鋭角となる姿勢で混合撹拌ヘッド６を構えることとなる。   FIG. 13 is a plan view showing a construction situation for constructing the improved wall B on a narrow block road sandwiched between houses M and the like on both sides, for example. As shown in the figure, after setting the crawler belt 2 of the base machine 1 so as to be parallel to the construction direction of the improved wall B, the rotation center of the mixing agitating head 6 from the turning center of the turning base 3 in the base machine 1 is set. The base machine 1 is brought close to the construction position of the improved wall B while maintaining the distance (working radius) L. Then, the mixing and stirring head 6 is held in a posture where the angle θ formed by the plane center lines C1 and C2 is an acute angle.

図１３では角度θをθ≒１５°に設定していて、取付角調整機構７の回転自由度を使って、図６の状態からアーム側ブラケット２６に対しヘッド側ブラケット２７を混合撹拌ヘッド６と共に角度αとして７５°程度回転させて、図１４に示すように、最終的に平面中心線Ｃ１，Ｃ２同士のなす角度θを１５°程度に設定している。   In FIG. 13, the angle θ is set to θ≈15 °, and the head side bracket 27 and the mixing agitating head 6 are moved from the state of FIG. As shown in FIG. 14, the angle θ formed between the plane center lines C1 and C2 is finally set to about 15 °.

この場合において、混合撹拌ヘッド６における混合撹拌翼１９の周回移動面は改良壁体Ｂの平面中心線Ｃ１と直角となるようにセットする。ただし、ベースマシン１の履帯２と改良壁体Ｂの平面中心線Ｃ１（＝改良壁体Ｂの構築方向）との平行度、および混合撹拌ヘッド６における混合撹拌翼１９の周回移動面と改良壁体Ｂの平面中心線Ｃ１との直角度の多少のばらつきは許容される。   In this case, the circumferential moving surface of the mixing and stirring blade 19 in the mixing and stirring head 6 is set to be perpendicular to the plane center line C1 of the improved wall B. However, the parallelism between the crawler belt 2 of the base machine 1 and the plane center line C1 (= construction direction of the improved wall body B) of the improved wall body B, and the circumferential moving surface of the mixed stirring blade 19 and the improved wall in the mixed stirring head 6 Some variation in perpendicularity with respect to the plane center line C1 of the body B is allowed.

その状態にて、アームシリンダ９等のほかアタッチメントシリンダ１０を伸縮動作させると、その伸縮動作に基づくブーム４およびアーム５の揺動動作方向の力Ｐは改良壁体Ｂの構築方向の分力Ｐ１またはＰ２を生じ、この分力Ｐ１またはＰ２は改良壁体Ｂの構築方向への掘進力となる。言い換えるならば、この掘進力は、ブーム４およびアーム５の揺動動作方向の力Ｐより生じるベクトルであって、混合撹拌ヘッド６の掘進ベクトルＰ１またはＰ２となる。   In this state, when the attachment cylinder 10 other than the arm cylinder 9 is expanded and contracted, the force P in the swinging operation direction of the boom 4 and the arm 5 based on the expansion and contraction is the component force P1 in the construction direction of the improved wall B. Alternatively, P2 is generated, and this component force P1 or P2 becomes a digging force in the construction direction of the improved wall body B. In other words, the digging force is a vector generated from the force P in the swinging operation direction of the boom 4 and the arm 5 and becomes the digging vector P1 or P2 of the mixing and stirring head 6.

なお、アームシリンダ９等のほかアタッチメントシリンダ１０の伸縮動作ストロークが限界となったならば、所定量だけベースマシン１を前進または後退動作させる。ただし、ベースマシン１の後退力および前進力は掘進力に寄与するものではなく、掘進ベクトルＰ１またはＰ２によって改良壁体Ｂが所定量だけ構築されたならば、その構築相当量だけベースマシン１自体を後退動作または前進動作させるにすぎない。また、図１３の符号Ｆは敷地境界を示す。   If the extension / retraction operation stroke of the attachment cylinder 10 other than the arm cylinder 9 or the like becomes a limit, the base machine 1 is moved forward or backward by a predetermined amount. However, the retreating force and the advancing force of the base machine 1 do not contribute to the digging force, and if the improved wall body B is constructed by a predetermined amount by the digging vector P1 or P2, the base machine 1 itself is produced by the construction equivalent amount. Is only moved backward or forward. Moreover, the code | symbol F of FIG. 13 shows a site boundary.

図１３ではベースマシン１の向きを逆にした場合を仮想線で示しているが、いずれの掘進方向であっても、混合撹拌翼１９の周回移動面と構築すべき改良壁体Ｂの平面中心線Ｃ１とを略直角とした上で、混合撹拌ヘッド６を改良壁体Ｂの平面中心線Ｃ１方向に掘進させるので、掘進ベクトルＰ１またはＰ２はいずれの方向においても同等のものとして得ることができる。また、図１３の例では改良壁体Ｂとベースマシン１の履帯２とのなす距離がぼぼ零で、先にも述べたように平面中心線Ｃ１，Ｃ２同士のなす角度θが１５°程度となっている。これにより、図２と図１３とを比較した場合に、距離Ｌが両者共に等しくても、距離Ｌ1は図１３の方が著しく小さくなる。 In FIG. 13, the case where the direction of the base machine 1 is reversed is indicated by phantom lines. However, in any of the digging directions, the circumferential moving surface of the mixing stirring blade 19 and the plane center of the improved wall B to be constructed Since the mixing and stirring head 6 is dug in the direction of the plane center line C1 of the improved wall B with the line C1 being substantially perpendicular, the dug vector P1 or P2 can be obtained as equivalent in any direction. . In the example of FIG. 13, the distance between the improved wall body B and the crawler belt 2 of the base machine 1 is almost zero, and the angle θ between the plane center lines C1 and C2 is about 15 ° as described above. It has become. Thus, when comparing FIG. 2 and FIG. 13, even if the distance L is the same, the distance L 1 is significantly smaller in FIG.

上記の掘進ベクトルＰ１またはＰ２は、改良壁体Ｂの構築のための実質的な掘進力であって、改良壁体Ｂの平面中心線Ｃ１とブーム４等の平面中心線Ｃ２とのなす角度θ２が小さければ小さいほど、大きな掘進ベクトルＰ１またはＰ２が得られる。この場合において、前記角度θの最小角度は、図１３に示すように、ベースマシン１の履帯２を改良壁体Ｂのベースマシン１側の側面と干渉しない程度まで近付けた時の角度であって、その角度は先に述べた１５°程度となる。それ故に、角度θ２≒１５°での掘進ベクトルＰ１またはＰ２が最大の掘進力となる。   The above digging vector P1 or P2 is a substantial digging force for constructing the improved wall B, and an angle θ2 formed by the plane center line C1 of the improved wall B and the plane center line C2 of the boom 4 or the like. The smaller the is, the larger the excavation vector P1 or P2 is obtained. In this case, as shown in FIG. 13, the minimum angle of the angle θ is an angle when the crawler belt 2 of the base machine 1 is brought close enough to not interfere with the side surface of the improved wall body B on the base machine 1 side. The angle is about 15 ° as described above. Therefore, the digging vector P1 or P2 at the angle θ2≈15 ° is the maximum digging force.

図１５は本発明に係る地盤改良装置の第２の実施の形態を示していて、図５に示した取付角調整機構７に代わる別の取付角調整機構の例を示している。   FIG. 15 shows a second embodiment of the ground improvement device according to the present invention, and shows an example of another mounting angle adjusting mechanism that replaces the mounting angle adjusting mechanism 7 shown in FIG.

図１５に示す取付角調整機構４７は、図５に示したものと比較すると明らかなように、ピン脱着式のアーム側ブラケット２６とヘッド側ブラケット５７とが円筒状の軸部材３２を介して相対回転可能に連結されている点で、図５に示したものと同じ構造である。その一方、ヘッド側ブラケット５７の可動板３０に対して、混合撹拌ヘッド６の上端部の固定側リンクプレート１４が図５のようなピン脱着によらずに直接的に溶接等にて一体的に接続されている点で、図５に示したものと異なっている。それ以外の構造は図１０に示したものと同様である。なお、図１５では、図５に示したボルト・ナット３６の図示を省略している。   The mounting angle adjusting mechanism 47 shown in FIG. 15 has a pin detachable arm side bracket 26 and a head side bracket 57 relative to each other via a cylindrical shaft member 32, as is apparent from the comparison with that shown in FIG. It is the same structure as what was shown in FIG. 5 by the point connected rotatably. On the other hand, with respect to the movable plate 30 of the head side bracket 57, the fixed side link plate 14 at the upper end portion of the mixing and stirring head 6 is directly integrated by welding or the like without using the pins as shown in FIG. It is different from that shown in FIG. 5 in that it is connected. The other structure is the same as that shown in FIG. In FIG. 15, the illustration of the bolts and nuts 36 shown in FIG. 5 is omitted.

このような構造の取付角調整機構４７によれば、取付角調整機構４７が実質的に混合撹拌ヘッド６と一体化されていることにより、図５に示したものと比べて構造の簡素化が図れるとともに、ベースマシン１のアーム５に対する脱着も容易となる。   According to the mounting angle adjusting mechanism 47 having such a structure, since the mounting angle adjusting mechanism 47 is substantially integrated with the mixing and stirring head 6, the structure can be simplified as compared with that shown in FIG. In addition, the base machine 1 can be easily attached to and detached from the arm 5.

１…ベースマシン
２…履帯
５…アーム
６…混合撹拌ヘッド
７…取付角調整機構
１３…ポスト部（支柱）
１５…油圧モータ
１６…駆動輪
１７…従動輪
１９…混合撹拌翼
２６…アーム側ブラケット
２７…ヘッド側ブラケット
２８…固定板
３０…可動板
３２…軸部材
３５…抜け止め部材
３６…ボルト・ナット（締結固定手段）
４７…取付角調整機構
５０…脱落防止機構
５７…ヘッド側ブラケット
Ｂ…改良壁体
Ｃ１…改良壁体の平面中心線
Ｃ２…ブームおよびアームの平面中心線 DESCRIPTION OF SYMBOLS 1 ... Base machine 2 ... Crawler belt 5 ... Arm 6 ... Mixing stirring head 7 ... Mounting angle adjustment mechanism 13 ... Post part (support)
DESCRIPTION OF SYMBOLS 15 ... Hydraulic motor 16 ... Drive wheel 17 ... Driven wheel 19 ... Mixing stirring blade 26 ... Arm side bracket 27 ... Head side bracket 28 ... Fixed plate 30 ... Movable plate 32 ... Shaft member 35 ... Retaining member 36 ... Bolt and nut ( Fastening and fixing means)
47 ... Mounting angle adjusting mechanism 50 ... Falling prevention mechanism 57 ... Head bracket B ... Improved wall body C1 ... Planar center line of improved wall body C2 ... Planar center line of boom and arm

Claims (9)

ショベル系の掘削機をベースマシンとして、そのベースマシンのアームの先端部に、上下方向に周回移動するチェーン式の混合撹拌翼を備えた混合撹拌ヘッドを装着し、前記混合撹拌ヘッドの混合撹拌翼による原位置土の掘削およびその原位置土と固化材との混合撹拌を行いながら、地中に前記混合撹拌翼の周回移動面の幅寸法に相当する連続した鉛直な改良壁体を構築する地盤改良装置であって、
前記改良壁体の構築に際して、平面視にて構築すべき改良壁体の厚み寸法を二分する平面中心線に対し前記ベースマシンの履帯をほぼ平行に保ちつつ、前記混合撹拌翼の周回移動面と前記平面中心線とをほぼ直角とした上で、前記混合撹拌ヘッドを前記平面中心線方向に掘進させるようにした地盤改良装置において、
前記混合撹拌ヘッドは、本体部となる支柱の上端部と下端部との間に無端状をなす前記チェーン式の混合撹拌翼を巻き掛けたものである一方、
前記ベースマシンのアームの先端部と前記混合撹拌ヘッドとの間に、前記平面中心線と前記ベースマシンの平面視でのブームおよびアームの中心線とのなす角度を調整可能な取付角調整機構が設けられていて、
前記取付角調整機構は、
前記ベースマシンのアームの先端部に連結される固定板と、
前記混合撹拌ヘッドの上端部に連結されると共に前記固定板と重ね合わされる可動板と、
前記固定板と可動板の中心部を貫通するように前記支柱の中心線の延長線上に配置され、前記固定板に対して前記可動板を回転可能に連結支持している軸部材と、
前記固定板に対して前記可動板を回転させた位置に規制してねじ締め固定する締結固定手段と、
を備えていることを特徴とする地盤改良装置。 Using a shovel excavator as a base machine, a mixing agitation head having a chain type agitation agitating blade that moves around in the vertical direction is attached to the tip of the arm of the base machine, The ground to construct a continuous vertical improved wall corresponding to the width dimension of the orbiting moving surface of the mixing stirring blade in the ground while excavating the in situ soil by mixing and mixing and stirring the in situ soil and the solidified material An improved device,
When constructing the improved wall body, while keeping the crawler belt of the base machine substantially parallel to a plane center line that bisects the thickness dimension of the improved wall body to be constructed in plan view, In the ground improvement device in which the mixed stirring head is dug in the direction of the plane center line, with the plane center line being substantially perpendicular to the plane center line,
The mixing and stirring head is obtained by wrapping the chain-type mixing and stirring blade having an endless shape between an upper end portion and a lower end portion of a support column serving as a main body portion,
An attachment angle adjusting mechanism capable of adjusting an angle formed by the center line of the plane and the center line of the boom and the arm in a plan view of the base machine between the tip of the arm of the base machine and the mixing and stirring head. Provided,
The mounting angle adjusting mechanism is
A fixed plate connected to the tip of the arm of the base machine;
A movable plate connected to the upper end of the mixing and stirring head and superimposed on the fixed plate;
A shaft member that is arranged on an extension of the center line of the support so as to penetrate the center portion of the fixed plate and the movable plate, and rotatably supports the movable plate with respect to the fixed plate;
Fastening and fixing means for restricting the fixed plate to the position where the movable plate is rotated and fixing by screwing;
A ground improvement device characterized by comprising: 前記混合撹拌ヘッドは、前記支柱の上端部にモータとそれによって駆動される駆動輪を、前記支柱の下端部に従動輪をそれぞれ配置すると共に、それらの駆動輪と従動輪との間に前記チェーン式の混合撹拌翼を巻き掛けたものであって、
前記混合撹拌ヘッドの平面視において、張り側となる前記チェーン式の混合撹拌翼と緩み側となる前記チェーン式の混合撹拌翼とで挟まれた領域であって且つ前記チェーン式の混合撹拌翼の幅寸法内で、前記取付角調整機構の軸部材と、前記混合撹拌ヘッドの支柱、モータ、駆動輪および従動輪のそれぞれが重なり合うように配置されていることを特徴とする請求項１に記載の地盤改良装置。 The mixing agitation head includes a motor and a driving wheel driven by the motor at an upper end portion of the support column, and a driven wheel at a lower end portion of the support column, and the chain between the driving wheel and the driven wheel. Wrapping the mixing stirring blade of the formula,
In the plan view of the mixing and stirring head, the chain-type mixing and stirring blade is a region sandwiched between the chain-type mixing and stirring blade that is on the tight side and the chain-type mixing and stirring blade that is on the loose side, and the chain-type mixing and stirring blade is The shaft member of the mounting angle adjusting mechanism and each of the column, motor, driving wheel and driven wheel of the mixing and stirring head are arranged so as to overlap each other within a width dimension. Ground improvement device. 前記取付角調整機構の固定板と可動板は共に水平で且つ互いに平行であって、
前記混合撹拌ヘッドの平面視において、張り側となる前記チェーン式の混合撹拌翼と緩み側となる前記チェーン式の混合撹拌翼とで挟まれた領域であって且つ前記チェーン式の混合撹拌翼の幅寸法内に納まるように、前記取付角調整機構の固定板および可動板の大きさがそれぞれ設定されていることを特徴とする請求項２に記載の地盤改良装置。 The fixed plate and the movable plate of the mounting angle adjusting mechanism are both horizontal and parallel to each other,
In the plan view of the mixing and stirring head, the chain-type mixing and stirring blade is a region sandwiched between the chain-type mixing and stirring blade that is on the tight side and the chain-type mixing and stirring blade that is on the loose side, and the chain-type mixing and stirring blade is The ground improvement device according to claim 2, wherein sizes of the fixed plate and the movable plate of the mounting angle adjusting mechanism are set so as to be within a width dimension. 前記取付角調整機構は、前記可動板を含む混合撹拌ヘッドの前記固定板からの脱落を防止する脱落防止機構を備えていることを特徴とする請求項３に記載の地盤改良装置。   The ground improvement device according to claim 3, wherein the attachment angle adjusting mechanism includes a drop prevention mechanism that prevents the mixing agitation head including the movable plate from dropping from the fixed plate. 前記取付角調整機構の軸部材が前記脱落防止機構の一部を兼ねていて、
前記脱落防止機構は、
前記固定板と可動板の中心部をそれぞれに貫通した前記軸部材の両端部に、それぞれの貫通穴からの前記軸部材の抜け出しを阻止する抜け止め部材を不離一体に設けてあることを特徴とする請求項４に記載の地盤改良装置。 The shaft member of the mounting angle adjustment mechanism also serves as a part of the drop-off prevention mechanism,
The drop-off prevention mechanism is
A retaining member for preventing the shaft member from coming out of each through hole is provided on both end portions of the shaft member penetrating the center portions of the fixed plate and the movable plate, respectively, in an integral manner. The ground improvement device according to claim 4. 前記取付角調整機構は、前記固定板が前記ベースマシンのアームの先端部に対して着脱可能で、且つ前記可動板が前記混合撹拌ヘッドの上端部に対して着脱可能な中間ブラケット式のものとして形成されていることを特徴とする請求項１〜５のいずれか一項に記載の地盤改良装置。   The mounting angle adjusting mechanism is an intermediate bracket type in which the fixed plate can be attached to and detached from the tip of the arm of the base machine, and the movable plate can be attached to and detached from the upper end of the mixing and stirring head. It is formed, The ground improvement apparatus as described in any one of Claims 1-5 characterized by the above-mentioned. 前記取付角調整機構は、前記固定板が前記ベースマシンのアームの先端部に対して着脱可能で、且つ前記可動板が前記混合撹拌ヘッドの上端部に対して一体的に結合されていることを特徴とする請求項１〜５のいずれか一項に記載の地盤改良装置。   The mounting angle adjusting mechanism is configured such that the fixed plate is detachable with respect to the distal end portion of the arm of the base machine, and the movable plate is integrally coupled to the upper end portion of the mixing and stirring head. The ground improvement apparatus as described in any one of Claims 1-5 characterized by the above-mentioned. 請求項１〜７のいずれか一項に記載の地盤改良装置を用いて行う改良壁体の構築方法であって、
前記取付角調整機構の機能により、前記平面中心線と前記ベースマシンの平面視でのブームおよびアームの中心線とのなす角度を鋭角に保った上で、前記混合撹拌ヘッドを前記平面中心線方向に掘進させて鉛直な改良壁体を構築することを特徴とする改良壁体の構築方法。 A construction method of an improved wall body that is performed using the ground improvement device according to any one of claims 1 to 7,
With the function of the mounting angle adjusting mechanism, an angle formed by the center line of the plane and the center line of the boom and the arm in a plan view of the base machine is maintained at an acute angle, and the mixing and stirring head is moved in the direction of the center line of the plane. A method for constructing an improved wall body, characterized in that a vertical improved wall body is constructed by digging into a wall. 前記平面中心線と前記ベースマシンの平面視でのブームおよびアームの中心線とのなす角度の最小角度を１５°として鉛直な改良壁体を構築することを特徴とする請求項８に記載の改良壁体の構築方法。   The improvement according to claim 8, wherein a vertical improvement wall body is constructed by setting a minimum angle formed by the plane center line and the center line of the boom and arm in a plan view of the base machine to 15 °. How to build a wall.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004108136A (en) * 2002-07-23 2004-04-08 Kato Construction Co Ltd Machine and construction method for soil improvement
JP2005225410A (en) * 2004-02-16 2005-08-25 Kato Construction Co Ltd Traveling control device of construction machinery, and ground improvement machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004108136A (en) * 2002-07-23 2004-04-08 Kato Construction Co Ltd Machine and construction method for soil improvement
JP2005225410A (en) * 2004-02-16 2005-08-25 Kato Construction Co Ltd Traveling control device of construction machinery, and ground improvement machine

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