JPH0941361A - Soil improving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To agitate and mix soil and sand in a scraping-region circle uniformly without exception by setting a distance between both axial centers of an excavating lever and installing a synchronous mechanism controlling the angles of rotation of both agitating blades. SOLUTION: The mutual overlapping regions of the scraping circles of agitating blades 24 are selected and a distance between both axial centers is set, the excavating levers 22 of a ground excavator 20 are buried gradually into the ground while being turned and driven and soil and sand are excavated by agitating blades 26, etc., and excavated soil and sand are stirred and mixed by the agitating blades 24. Soil and sand are supplied with a hardener from hardener discharge nozzles at front end sections at the same time as the agitation and mixing of excavated soil and sand. Accordingly, an improved stabilized improved column body is formed and a weak ground is changed into a hard ground by successively continuing excavation up to specified depth from a ground surface while agitating and mixing excavated soil and sand as supplying the hardener. Revolution is controlled so that the rotational speed of two shafts is tuned at that time, and operation is enabled without trouble even when the scraping circles of the agitating blades 24, 24 of both shafts are overlapped.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は地盤改良装置に係り、特
に、軟弱地盤の内部に固化材を均一に攪拌・混合して所
要の強度を有する柱状改良体を築造して、安定した改良
地盤を造成する地盤改良装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement device, and more particularly, to a stable improved ground by constructing a columnar improved body having a required strength by uniformly stirring and mixing a solidifying material inside a soft ground. The present invention relates to a ground improvement device for creating a ground.

【０００２】[0002]

【従来の技術】従来の地盤改良装置においては、掘削悍
は、１本の単軸型のものと２本以上を有する多軸型のも
のとがある。図１０は、１本の掘削悍を有する地盤改良
装置の１例を示すものであり、掘削悍１の先端に、その
上方に固着される掘削翼２の掘削径よりも小さい穿孔掘
削翼６を取り付け掘削翼２の上にこれより大径の共回り
防止翼４を遊嵌状態で取り付け、さらにその上に攪拌翼
３ａ、３ｂ、３ｃを固着し、固化材の噴出口８を備えて
いる。一方、掘削悍を２本有する多軸型の地盤改良装置
は、図１１に示されるように、適当な間隔を離間して２
本の掘削悍１、１が平行に配列され、それぞれ掘削悍１
とともに回転する掘削翼２と攪拌翼３ａ、３ｂ、３ｃが
掘削悍１に固着され、掘削悍１に遊嵌状態で両掘削悍
１、１同志を連結する共回り防止翼４、５が配設され、
噴出口１ａ、１ａが備えられている。そして、多軸型は
単軸型に比べて同一時間に作業する地盤掘削面積が広い
ため、当然のことながら作業効率がよい。2. Description of the Related Art In conventional ground improvement devices, there are two types of excavation and hoisting type, a single-axis type and a multi-axis type. FIG. 10 shows an example of a ground improvement device having one excavation blade, in which a drilling blade 6 having a diameter smaller than the diameter of the excavation blade 2 fixed to the tip of the excavation blade 1 is provided. A co-rotation prevention blade 4 having a larger diameter than this is attached on the attached excavation blade 2 in a loosely fitted state, and stirring blades 3a, 3b, 3c are further fixed thereon, and a jetting port 8 for the solidifying material is provided. On the other hand, as shown in FIG. 11, the multi-axis type soil improvement device having two excavation hoisting units is separated from each other by an appropriate distance.
Book excavators 1, 1 are arranged in parallel, and each excavator 1
The excavation blade 2 and the stirring blades 3a, 3b, and 3c that rotate together are fixed to the excavation shroud 1, and co-rotation prevention blades 4 and 5 that connect both the excavation shrouds 1 and 1 in a loosely fitted state to the excavation drill 1 are provided. Is
The spouts 1a, 1a are provided. Since the multi-axis type has a larger ground excavation area for working at the same time than the single-axis type, the work efficiency is naturally good.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、多軸型
の地盤改良装置は、例えば、図１２に示されるとおり、
２本の掘削悍における掘削翼や攪拌翼の直径や高さ方向
配列を全く同一に形成し、同一高さに配列した場合に
は、掘削翼や攪拌翼が互いに接触干渉しないようにする
ためこれらの掃過円がオーバラップしないように両方の
掘削悍距離を大きくする必要があるが、この場合掃過円
のオーバラップしない部分の土砂の攪拌が不十分にな
る。そこで、図１３のように、一方の攪拌翼の掃過円が
他方の攪拌翼の掃過円とオーバラップするように２本の
掘削悍を近接して配置する場合には、隣合う２本の掘削
悍の攪拌翼や掘削翼が接触干渉しないようにその高さを
上下方向にずらした状態としているが、共回り防止翼を
設けるために、共回り防止翼を含んだ上下両攪拌翼間高
さＨ2 は、共回り防止翼を含まない上下両攪拌翼間高さ
Ｈ1 に比べて必要以上に大きくなり過ぎ、この部分の土
砂の攪拌作用が不十分になるという難点がある。また、
２軸型の両掘削悍間の軸芯間距離が固定されている場合
には、オーバラップ領域が設計の段階で固定されてお
り、地盤改良する土質に応じて作業現場で臨機応変にオ
ーバラップ量を適宜変更することができず、不便をきた
していた。However, a multi-axis type soil improvement device is, for example, as shown in FIG.
The diameter and height of the excavating blades and agitating blades in the two excavating blades are exactly the same, and when they are arranged at the same height, the excavating blades and agitating blades are arranged so that they do not interfere with each other. It is necessary to increase both excavation distances so as not to overlap the sweep circles, but in this case, the agitation of the sand in the non-overlapping portions of the sweep circles becomes insufficient. Therefore, as shown in FIG. 13, when the two excavator blades are arranged close to each other so that the sweeping circle of one stirring blade overlaps with the sweeping circle of the other stirring blade, two adjacent adhering blades can be used. The height of the agitating blades of the excavator and the excavating blades are vertically shifted so that they do not interfere with each other. The height H2 becomes unnecessarily large as compared with the height H1 between the upper and lower stirring blades which does not include the co-rotation preventing blade, and there is a drawback that the stirring action of the earth and sand in this portion becomes insufficient. Also,
When the axial distance between the two shafts is fixed, the overlap area is fixed at the design stage, and the overlap is flexible at the work site according to the soil quality to be improved. It was inconvenient because the amount could not be changed appropriately.

【０００４】[0004]

【課題を解決するための手段】このような課題を解決す
るために、本発明においては、第１の発明では、軟弱地
盤内に固化材を均一に混合した柱状改良体を形成する軟
弱地盤の地盤改良装置であって、地盤掘削装置と該地盤
掘削装置を搭載し移動するクローラで形成された走行装
置と固化材注入装置とからなり、該地盤掘削装置は該走
行装置に傾動自在に立設された柱脚に布設されたガイド
レールに沿って巻上機の作動により昇降自在な左右一対
の掘削悍を備え、該両掘削悍の下部側方には半径水平方
向に両掘削悍ともそれぞれ同一高さに突出する複数段の
円周等間隔に複数枚で形成された攪拌羽根を備え、該両
掘削悍間の軸芯間距離を各々の掘削悍に突設された攪拌
羽根のそれぞれの掃過円がオーバラップする状態に設定
するとともに、該両掘削悍の軸芯間距離を伸縮自在な軸
芯可変装置を具備し、該両掘削悍の攪拌羽根が稼働中互
いに接触干渉しないように両攪拌羽根の回転角度を制御
する同期機構を備え、該攪拌羽根間の中間高さ位置で両
端がそれぞれ該掘削悍に遊嵌され該両掘削悍同志を連結
する水平で伸縮自在な泥***回り防止部材を配設し、最
下部に先端が略下方に突出する鋭利な刃物を有する回転
自在な掘削翼を備えるとともに、前記固化材注入装置に
接続された固化材吐出ノズルを配設し、該固化材注入装
置は固化材サイロと固化材移送用の固化材ポンプまたは
コンプレッサと前記固化材吐出ノズルに接続される固化
材輸送用の固化材供給配管とを備えてなる地盤改良装置
とした。また、第２の発明では、軸芯可変装置を、各々
の掘削悍を把持する把持部と、該両把持部と接続され伸
縮自在な連結部と、油圧シリンダもしくはボールネジ機
構からなる該連結部の伸縮手段とで構成した。さらに、
第３の発明では、軸芯可変装置の伸縮機構を、平行四辺
形リンク機構とした。In order to solve such a problem, in the present invention, in the first invention, the soft ground which forms the columnar improved body in which the solidifying material is uniformly mixed in the soft ground is used. A ground improvement device comprising a ground excavating device, a traveling device formed of a crawler for mounting and moving the ground excavating device, and a solidifying material injecting device, and the ground excavating device is erected in a tiltable manner on the traveling device. Equipped with a pair of left and right excavators that can be raised and lowered by the operation of the hoist along the guide rails laid on the column bases. A plurality of stirrer blades protruding at a height are formed at equal intervals around the circumference of the stirrer blade. Set the overlapping circles so that The excavator has a shaft center variable device capable of expanding and contracting the distance between the shaft centers of the excavator, and a synchronization mechanism for controlling the rotation angles of the stirring blades of the two excavators so that they do not interfere with each other during operation. At the intermediate height position between the stirring blades, both ends are loosely fitted to the excavation mortar and horizontal and elastic mud co-rotation preventing members that connect the two digging mortars are arranged. The solidified material injection nozzle provided with a rotatable excavation blade having a protruding sharp blade is connected to the solidified material injection device, and the solidified material injection device is a solidification material silo and a solidification material for solidification material transfer. The ground improvement apparatus comprises a material pump or compressor and a solidified material supply pipe for transportation of the solidified material connected to the solidified material discharge nozzle. According to the second aspect of the invention, the shaft center varying device is provided with a gripping part for gripping each of the excavators, a connecting part that is expandable and contractable and is connected to the both gripping parts, and a connecting part including a hydraulic cylinder or a ball screw mechanism. It is composed of expansion and contraction means. further,
In the third invention, the expansion / contraction mechanism of the variable axis device is a parallelogram link mechanism.

【０００５】[0005]

【作用】本発明においては、各段の攪拌羽根の高さを同
一にし、しかも隣合う両攪拌羽根の掃過円を作業現場の
土質に合わせて所望のオーバラップ量となるよう掘削悍
の両軸芯間距離を設定して配置するとともに、両攪拌羽
根の回転角度を制御する同期機構を備えているので両攪
拌羽根が接触干渉しないように各々の掘削悍を同期して
回転駆動するから、両攪拌羽根の掃過円で囲まれる領域
の土砂はいずれの高さにおいても万遍なく均一に攪拌混
合される。According to the present invention, the heights of the stirring blades in each stage are made the same, and the sweeping circles of the adjoining stirring blades are matched to the soil at the work site to obtain a desired overlap amount. In addition to setting and arranging the shaft center distance, since it is equipped with a synchronization mechanism that controls the rotation angle of both stirring blades, each excavation blade is driven to rotate synchronously so that both stirring blades do not interfere with each other. The soil in the area surrounded by the sweeping circles of both stirring blades is uniformly stirred and mixed at any height.

【０００６】[0006]

【実施例】以下図面に基づいて本発明の実施例の詳細に
ついて説明する。図１〜図９は、本発明の実施例に係
り、図１は地盤改良装置の全体側面図、図２は掘削悍の
要部拡大正面図、図３は図２のＡ−Ａ視の断面平面図、
図４は地盤掘削装置の掘削悍の駆動装置の正面図、図５
は１実施例を示す軸芯可変装置の正面図、図６は図５の
Ｘ−Ｘ視の断面平面図、図７は図５のＹ−Ｙ視の断面平
面図、図８は他の実施例を示す軸芯可変装置の断面平面
図、図９は別の他の実施例を示す軸芯可変装置の断面平
面図である。図１に示すように、地盤改良装置１００は
キャタピラー１２により走行自在なクローラ１０Ａから
なる走行装置１０と、走行装置１０上に傾動用シリンダ
１６Ａにより傾動自在な柱脚１６とこれに沿設されたガ
イドレール１６Ｂに沿って巻上機により昇降自在な掘削
悍２２からなる地盤掘削装置２０と、掘削悍２２の下部
先端部に固化材を供給する固化材注入装置４０とから構
成される。Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 9 relate to an embodiment of the present invention, FIG. 1 is an overall side view of a ground improvement device, FIG. 2 is an enlarged front view of a main part of an excavation and hoisting device, and FIG. 3 is a sectional view taken along line AA of FIG. Plan view,
FIG. 4 is a front view of a drive device for excavation and horrification of the ground excavator, and FIG.
Is a front view of a shaft center variable device showing one embodiment, FIG. 6 is a sectional plan view taken along line XX of FIG. 5, FIG. 7 is a sectional plan view taken along line YY of FIG. 5, and FIG. FIG. 9 is a sectional plan view of a shaft center varying device showing an example, and FIG. 9 is a sectional plan view of a shaft center varying device showing another embodiment. As shown in FIG. 1, the ground improvement device 100 includes a traveling device 10 including a crawler 10A that can travel by a caterpillar 12, a column base 16 that can be tilted by a tilting cylinder 16A on the traveling device 10, and a column base 16 installed along the traveling device 10. The ground excavator 20 is composed of an excavator 22 which can be lifted and lowered by a hoist along a guide rail 16B, and a solidifying material injecting device 40 which supplies a solidifying material to a lower end portion of the excavator 22.

【０００７】地盤掘削装置２０は、２本の掘削悍２２、
２２が平行に配列され、それぞれの掘削悍２２の下端部
には、図２に示されるように、下方に鋭利な刃面を有す
る複数個のバイト２６ａを取り付けた掘削翼２６や外周
部に斜めにバイト２８ａが取り付けられた掘削翼２６よ
りも大径の掘削翼２８が水平に突設され、その上部には
複数段の攪拌羽根（攪拌翼ともいう）２４が適当間隔に
離して突設される。攪拌羽根２４は、平板を立てた状態
にするか、または、図３に示すように、平板を斜めに傾
斜させた状態にして１８０度方向に延びた２枚で形成す
るか、または十文字状に４枚で形成してもよい。あるい
は、１２０度ずつ円周方向に配列された３枚のものや５
枚以上のものにしてもよいが、羽根枚数が多いと左右の
攪拌羽根の接触干渉を避けることが困難になるので、通
常は２枚、３枚、４枚のなかから選定する。そして、各
段の攪拌羽根２４はそれぞれ隣の掘削悍２２の攪拌羽根
２４と同一高さに配列するとともに、図３に示すよう
に、その掃過円がオーバラップするように両掘削悍距離
を選定する。そして、両掘削悍２２、２２の回転方向は
互いに逆向きとし、かつ、相隣合う同一高さの攪拌羽根
２４、２４が接触干渉しないように、同期機構により回
転角度を制御する。両掘削悍２２、２２間距離は攪拌羽
根２４の各々の掃過円がオーバラップするようにしたう
え、例えば、図５〜図７に示すような軸芯可変装置（伸
縮機構）６０を使用するか、あるいは、図８や図９に示
す平行四辺形リンク機構７０、７５を利用したメカニズ
ムなどを採用した軸芯可変装置６０により、両掘削悍間
距離が可変自在となるように構成してもよい。The ground excavation device 20 includes two excavation hoists 22,
22 are arranged in parallel, and as shown in FIG. 2, at the lower end of each of the excavation blades 22, a plurality of cutting tools 26a having sharp blade surfaces are attached to the excavation blades 26 and the outer peripheral portion. An excavation blade 28 having a diameter larger than that of the excavation blade 26 to which a bite 28a is attached is horizontally projected, and a plurality of stages of stirring blades (also referred to as stirring blades) 24 are projectingly provided on the upper portion thereof at appropriate intervals. It The stirring blade 24 is formed by standing the flat plate, or by forming the flat plate in an inclined state as shown in FIG. You may form with four sheets. Alternatively, 3 pieces or 5 pieces arranged in the circumferential direction at intervals of 120 degrees
Although the number of blades may be more than one, it is difficult to avoid contact interference between the left and right stirring blades if the number of blades is large. Therefore, usually, it is selected from 2, 3, or 4. The stirrer blades 24 of each stage are arranged at the same height as the stirrer blades 24 of the adjacent excavation blades 22 and, as shown in FIG. 3, both excavation distances are set so that the sweep circles overlap each other. Select. Then, the rotation directions of the two excavator blades 22, 22 are opposite to each other, and the rotation angle is controlled by a synchronizing mechanism so that adjacent stirring blades 24, 24 of the same height do not come into contact with each other. The distance between the two digging holes 22 is set so that the sweeping circles of the stirring blades 24 overlap each other, and for example, a shaft center variable device (expansion / contraction mechanism) 60 as shown in FIGS. 5 to 7 is used. Alternatively, the distance between both excavations can be made variable by the axial center variable device 60 that adopts the mechanism using the parallelogram link mechanisms 70 and 75 shown in FIGS. 8 and 9. Good.

【０００８】すなわち、第２の発明に相当する図５〜図
７の実施例では、軸芯可変装置（伸縮機構）６０は、各
々の掘削悍２２、２２をそれぞれ軸受６１ａ、６２ａを
介して把持する厚肉の水平板で形成された把持部６１、
６２を油圧シリンダ６３で連結したものであり、把持部
６１の端部にはさらに油圧シリンダ６５を介して張出部
６４が取り付けられる。さらに、把持部６１や把持部６
２の下方の掘削悍２２、２２に図７に示すとおり、大径
のチエンホイール６６ａ、６６ｂが取り付けられ、一方
把持部６１の他端部の下方と張出部６４の下方に回転軸
を介してそれぞれ小径のチエンホイール６７ａ、６７ｂ
が取り付けられ、図７のようにローラチエン６８が巻回
される。このようにして、掘削悍２２、２２の軸芯間距
離が油圧シリンダ６３の作動により可変できる。油圧シ
リンダ６５は軸芯間距離を変更した後のローラチエン６
８の緊張度の調整に使用する。図８と図９は第３の発明
に相当し、それぞれ平行四辺形リンク機構７０を採用し
た軸芯可変装置（伸縮機構）６０を示したもので、図８
は、リンク機構７０のクロスしたリンク７１、７２を中
央でピン接合し油圧シリンダ７３で把持部６１、６２間
距離を接離し、両軸芯間距離を変更する。That is, in the embodiment of FIGS. 5 to 7 corresponding to the second aspect of the invention, the shaft center variable device (expansion and contraction mechanism) 60 grips the respective excavation hoses 22 and 22 via bearings 61a and 62a, respectively. A grip portion 61 formed of a thick horizontal plate
62 is connected by a hydraulic cylinder 63, and an overhanging portion 64 is attached to an end portion of the grip portion 61 via a hydraulic cylinder 65. Further, the grip 61 or the grip 6
As shown in FIG. 7, large-diameter chain wheels 66a and 66b are attached to the excavators 22 and 22 below 2, and the rotary shaft is provided below the other end of the one grip 61 and below the overhang 64. Chain wheels 67a and 67b each having a small diameter
Is attached, and the roller chain 68 is wound as shown in FIG. In this way, the distance between the shaft centers of the excavators 22 can be changed by the operation of the hydraulic cylinder 63. The hydraulic cylinder 65 is the roller chain 6 after changing the distance between the shaft centers.
Used to adjust the degree of tension of 8. 8 and 9 correspond to the third aspect of the invention, and each show a variable axis device (expansion and contraction mechanism) 60 that employs a parallelogram link mechanism 70.
Changes the distance between the two shafts by connecting the crossed links 71, 72 of the link mechanism 70 at the center with the hydraulic cylinder 73 to bring the grip portions 61, 62 into and out of contact with each other.

【０００９】これに対して、図９では平行なリンク７
６、７７を油圧シリンダ７８、７９で角度変化させ把持
部６１、６２間距離を接離する方式とした。また、掘削
悍２２の下端部側壁には１個または複数個の固化材吐出
ノズル５０が配設され、後述する固化材供給配管４８と
接続されて固化材を吐出できるようになっている。一
方、図２に示すように、任意の隣接する上下攪拌羽根間
２４、２４間の中間に両端が掘削悍２２の外周に遊嵌す
る水平な泥***回り防止部材３０を掛け渡して掘削悍２
２、２２同志を連結する。泥***回り防止部材３０の中
間部には、両掘削悍の軸芯間距離の変更に対応できるた
め、２重管構造として一方の管内を他方の管が摺動可能
に構成される。On the other hand, in FIG.
6 and 77 are changed in angle by hydraulic cylinders 78 and 79 so that the grip portions 61 and 62 are brought into contact with and separated from each other. Further, one or a plurality of solidifying material discharge nozzles 50 are provided on the side wall of the lower end portion of the excavator 22 and are connected to a solidifying material supply pipe 48 to be described later so that the solidifying material can be discharged. On the other hand, as shown in FIG. 2, a horizontal mud co-rotation preventing member 30 whose both ends are loosely fitted around the outer circumference of the excavation girder 22 is laid between any adjacent upper and lower stirring blades 24, 24 to excavate the girder 2
2, 22 connect together. The middle part of the mud co-rotation preventing member 30 can accommodate a change in the distance between the axes of both excavations, so that the other pipe can be slid in one pipe as a double pipe structure.

【００１０】図４は、地盤掘削装置２０の駆動装置を示
し、掘削悍２２の上部に掘削悍２２をそれぞれ回転駆動
する油圧モータ３６が配設され、さらに同期装置３８を
経由して掘削悍２２に接続される。同期装置３８は、各
々の油圧モータ３６の出力軸の回転角度の相互関係を任
意に設定された通りに制御するもので、例えば、歯車機
構や図７に示したチエンホイール機構などを使用しても
よいし、また電気的な手段を採用してもよい。FIG. 4 shows a drive device for the ground excavation device 20, in which hydraulic motors 36 for rotating and driving the excavation drill 22 are arranged above the excavation drill 22, and the excavation drill 22 is further passed through a synchronizing device 38. Connected to. The synchronizer 38 controls the mutual relation of the rotation angles of the output shafts of the respective hydraulic motors 36 as set arbitrarily. For example, a gear mechanism or a chain wheel mechanism shown in FIG. 7 is used. Alternatively, electrical means may be adopted.

【００１１】固化材注入装置４０は、図１に示すよう
に、例えばトラック４２などの車両に固化材を貯溜する
固化材サイロ４４とポンプ４６（固化材が液体の場合）
またはコンプレッサ４６Ａ（固化材が粉体の場合）など
の固化材の移送手段を搭載し、フレキシブル管で形成さ
れた固化材供給配管４８を経由して掘削悍２２の上部に
取り付けられた回転継手４８ａから掘削悍２２の中心軸
方向に穿孔された固化材流路２２ａを通って、掘削悍２
２の下部先端の固化材吐出ノズル５０から固化材を吐出
するようになっている。As shown in FIG. 1, the solidifying material injecting device 40 includes a solidifying material silo 44 for storing the solidifying material in a vehicle such as a truck 42 and a pump 46 (when the solidifying material is liquid).
Alternatively, a rotary joint 48a mounted with a means for transferring a solidifying material such as a compressor 46A (when the solidifying material is powder) and attached to the upper part of the excavator 22 through a solidifying material supply pipe 48 formed of a flexible pipe. Through the solidifying material flow path 22a which is drilled in the central axis direction of
The solidified material is discharged from the solidified material discharge nozzle 50 at the tip of the lower part of 2.

【００１２】次に、以上のように構成された本発明の作
動について説明する。まず、走行装置１０のクローラ１
０Ａを地盤改良を必要とする作業現場に移動して固定し
た後、柱脚１６を鉛直に立ててから巻上機１４でワイヤ
ロープ１４ａを下降し、地盤掘削装置２０をガイドレー
ル１６Ｂに沿って静かに地面上に下ろすとともに、あら
かじめその作業現場の土質を考慮のうえ攪拌羽根２４の
掃過円同志のオーバラップ領域を適切に選定して両軸芯
間距離を設定したのち、地盤掘削装置２０の掘削悍２２
駆動用の油圧モータ３６を回転駆動する。この掘削作業
の進行とともに、掘削悍２２は徐々に地中に埋没し下部
先端の掘削翼２６や掘削翼２８のバイト２６ａ、２８ａ
が掘削悍下部や掘削悍周囲に土砂を掘削し、攪拌羽根２
４が掘削された土砂を攪拌混合する。この掘削混合に際
して固化材注入装置４０を稼働して先端部の固化材吐出
ノズル５０より固化材を土砂へ供給する。このようにし
て、地表面から順次所定の深さまで掘削を続けるととも
に、固化材を供給しつつ攪拌混合することによって、改
良され安定した改良柱体を形成し、軟弱地盤を改良され
た硬い地盤とする。１か所の作業を終わると、巻上機１
４を操作して、地盤掘削装置２０を地上へ上昇させ、次
の作業箇所へ移動させ、以下同様の作業を継続する。な
お、固化材は、水に溶解させて水溶液など液体として供
給することも、あるいは、粉体を空気とともにエア搬送
して供給することもできる。Next, the operation of the present invention constructed as above will be described. First, the crawler 1 of the traveling device 10
After moving and fixing 0A to the work site requiring ground improvement, the column base 16 is erected vertically and then the wire rope 14a is lowered by the hoisting machine 14, and the ground excavating device 20 is guided along the guide rail 16B. The ground excavator 20 is set after gently lowering it on the ground and setting the inter-axle distance by appropriately selecting the overlap region of the sweeping circles of the stirring blade 24 in consideration of the soil quality of the work site in advance. Excavation and fear 22
The hydraulic motor 36 for driving is rotationally driven. As the excavation work progresses, the excavation mortar 22 is gradually buried in the ground, and the excavation blades 26 at the lower tip and the cutting tools 26a, 28a of the excavation blades 28 are formed.
Excavates earth and sand in the lower part of the excavation girder and around the excavation girder, and the stirring blade 2
4 mixes the excavated earth and sand with stirring. During this excavation and mixing, the solidifying material injection device 40 is operated to supply the solidifying material to the earth and sand from the solidifying material discharge nozzle 50 at the tip. In this way, while continuously excavating from the ground surface to a predetermined depth, by stirring and mixing while supplying the solidifying material, an improved and stable improved columnar body is formed, and the soft ground is improved with the hard ground. To do. Hoisting machine 1
4 is operated to raise the ground excavation device 20 to the ground, move it to the next work location, and continue the same work. The solidifying material may be dissolved in water and supplied as a liquid such as an aqueous solution, or powder may be supplied by air carrying with air.

【００１３】以上述べたように、本発明においては、２
軸の地盤改良装置において、２軸の回転角度を同調する
ように回転を制御することによって、両軸の攪拌羽根２
４、２４の掃過円をオーバラップさせても支障なく作業
を実施できるから、掘削した土砂や泥土を均一に攪拌で
きる。また、作業現場の土質に合わせて攪拌羽根２４の
オーバラップ量を簡便容易に変更できるから、より肌理
の細かい適切な作業が実施できる。As described above, in the present invention, 2
In the shaft ground improvement device, by controlling the rotation so as to synchronize the rotation angles of the two shafts, the stirring blades 2 of both shafts are
Even if the sweeping circles 4 and 24 are overlapped, the work can be carried out without any trouble, so that the excavated earth and sand or mud can be uniformly stirred. Moreover, since the overlap amount of the stirring blade 24 can be easily and easily changed according to the soil quality of the work site, a more fine and appropriate work can be performed.

【００１４】[0014]

【発明の効果】以上説明したように、本発明において
は、下記の優れた作用効果がある。 （１）両軸の攪拌羽根の掃過円をオーバラップさせても
支障なく作業を実施できるから、掘削した土砂と固化材
の混合均一性が高く、土砂の改良度が向上する。 （２）左右の攪拌羽根を段違いでなく、同一レベルに配
列できるので、隣接する上下の攪拌羽根間の高さを短く
できる。したがって、攪拌効率が高い。特に、段違い方
式における泥***回り部材近傍の攪拌羽根間のデッドゾ
ーンを排除できる。 （３）両軸の攪拌羽根の掃過円のオーバラップ量を任意
に変更できるから、作業現場の土質に適合した能率的な
作業を実施でき、作業効率が向上する。 （４）地質の相違や異物の存在により、左右の掘削悍に
かかるトルクが異なっても同調装置により各々の掘削悍
の駆動用油圧モータの負荷を均等化できる。As described above, the present invention has the following excellent functions and effects. (1) Since the work can be carried out without any problem even if the sweeping circles of the stirring blades on both shafts are overlapped with each other, the mixing uniformity of the excavated earth and sand and the solidifying material is high, and the degree of improvement of earth and sand is improved. (2) Since the left and right stirring blades can be arranged at the same level without a step difference, the height between adjacent upper and lower stirring blades can be shortened. Therefore, the stirring efficiency is high. In particular, the dead zone between the stirring blades near the mud co-rotating member in the step difference method can be eliminated. (3) Since the amount of overlap of the sweeping circles of the stirring blades on both shafts can be arbitrarily changed, efficient work suitable for the soil at the work site can be performed, and work efficiency is improved. (4) Even if the torque applied to the right and left excavations is different due to the difference in geology and the presence of foreign matter, the load of the hydraulic motor for driving each excavation can be equalized by the tuning device.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の実施例に係る地盤改良装置の全体側面
図である。FIG. 1 is an overall side view of a ground improvement device according to an embodiment of the present invention.

【図２】本発明の実施例に係る地盤改良装置の掘削悍の
要部拡大正面図である。FIG. 2 is an enlarged front view of a main part of excavation and puddle of the ground improvement device according to the embodiment of the present invention.

【図３】図２のＡ−Ａ視の断面平面図である。3 is a cross-sectional plan view taken along the line AA of FIG.

【図４】本発明の実施例に係る地盤掘削装置の掘削悍の
駆動装置の正面図である。FIG. 4 is a front view of a drive device for excavation and pavement of the ground excavation device according to the embodiment of the present invention.

【図５】本発明の実施例に係る軸芯可変装置の要部正面
図である。FIG. 5 is a front view of a main part of a shaft center varying device according to an embodiment of the present invention.

【図６】図５のＸ−Ｘ視の断面平面図である。6 is a cross-sectional plan view taken along line XX of FIG.

【図７】図５のＹ−Ｙ視の断面平面図である。7 is a cross-sectional plan view taken along the line YY of FIG.

【図８】本発明の他の実施例に係る軸芯可変装置の断面
平面図である。FIG. 8 is a cross-sectional plan view of a shaft center variable device according to another embodiment of the present invention.

【図９】本発明の別の他の実施例に係る軸芯可変装置の
断面平面図である。FIG. 9 is a cross-sectional plan view of a shaft center varying device according to another embodiment of the present invention.

【図１０】従来の単軸型の地盤改良装置の掘削悍の正面
図である。FIG. 10 is a front view of excavation and hoarding of a conventional single-axis ground improvement device.

【図１１】従来の２軸型の地盤改良装置の掘削悍の正面
図である。FIG. 11 is a front view of excavation and hoarding of a conventional two-axis type ground improvement device.

【図１２】従来の２軸並列型の地盤改良装置の掘削悍の
正面図である。FIG. 12 is a front view of excavation and damage of a conventional two-axis parallel type ground improvement device.

【図１３】従来の２軸段違い型の地盤改良装置の掘削悍
の正面図である。FIG. 13 is a front view of excavation for a conventional two-axis stepped type soil improvement device.

【符号の説明】[Explanation of symbols]

１ 掘削悍 １ａ 噴出口 ２ 掘削翼 ３ａ、３ｂ、３ｃ 攪拌翼 ４ 共回り防止翼 ５ 共回り防止翼 ６ 穿孔掘削翼 ８ 噴出口 １０ 走行装置 １０Ａ クローラ １２ キャタピラー １４ 巻上機 １４ａ ワイヤロープ １６ 柱脚 １６Ａ 傾動用シリンダ １６Ｂ ガイドレール ２０ 地盤掘削装置 ２２ 掘削悍 ２２ａ 固化材流路 ２４ 攪拌羽根（攪拌翼） ２６ 掘削翼 ２６ａ バイト ２８ 掘削翼 ２８ａ バイト ３０ 共回り防止部材（泥***回り防止部材） ３６ 油圧モータ ３８ 同期装置 ４０ 固化材注入装置 ４２ トラック ４４ 固化材サイロ ４６ ポンプ（コンプレッサ） ４６Ａ コンプレッサ ４８ 固化材供給配管 ４８ａ 回転継手 ５０ 固化材吐出ノズル ６０ 軸芯可変装置（伸縮機構） ６１、６２ 把持部 ６１ａ、６２ａ 軸受 ６３ 油圧シリンダ ６４ 張出部 ６５ 油圧シリンダ ６６ａ、６６ｂ、６７ａ、６７ｂ チエンホイール ６８ ローラチエン ７０ リンク機構 ７１、７２ リンク ７３ 油圧シリンダ ７５ リンク機構 ７６、７７ リンク ７８、７９ 油圧シリンダ １００ 地盤改良装置 DESCRIPTION OF SYMBOLS 1 Excavator 1a Jet outlet 2 Excavation blade 3a, 3b, 3c Stirring blade 4 Co-rotation prevention blade 5 Co-rotation prevention blade 6 Drilling excavation blade 8 Jet outlet 10 Traveling device 10A Crawler 12 Caterpillar 14 Hoisting machine 14a Wire rope 16 Column base 16A Tilt cylinder 16B Guide rail 20 Ground excavation device 22 Excavation erosion 22a Solidifying material flow path 24 Stirring blade (stirring blade) 26 Excavation blade 26a byte 28 Excavation blade 28a byte 30 Co-rotation prevention member (mud co-rotation prevention member) 36 Hydraulic pressure Motor 38 Synchronizing device 40 Solidifying material injecting device 42 Track 44 Solidifying material silo 46 Pump (compressor) 46A Compressor 48 Solidifying material supply pipe 48a Rotating joint 50 Solidifying material discharge nozzle 60 Shaft core variable device (expansion mechanism) 61, 62 Grasping part 61a , 62a Bearing 63 Hydraulic cylinder 64 Overhang Part 65 Hydraulic cylinder 66a, 66b, 67a, 67b Chain wheel 68 Roller chain 70 Link mechanism 71, 72 Link 73 Hydraulic cylinder 75 Link mechanism 76, 77 Link 78, 79 Hydraulic cylinder 100 Ground improvement device

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 軟弱地盤内に固化材を均一に混合した柱
状改良体を形成する軟弱地盤の地盤改良装置であって、
地盤掘削装置と該地盤掘削装置を搭載し移動するクロー
ラで形成された走行装置と固化材注入装置とからなり、 該地盤掘削装置は、該走行装置に傾動自在に立設された
柱脚に布設されたガイドレールに沿って巻上機の作動に
より昇降自在な左右一対の掘削悍を備え、該両掘削悍の
下部側方には半径水平方向に両掘削悍ともそれぞれ同一
高さに突出する複数段の円周等間隔に複数枚で形成され
た攪拌羽根を備え、該両掘削悍間の軸芯間距離を各々の
掘削悍に突設された攪拌羽根のそれぞれの掃過円がオー
バラップする状態に設定するとともに、該両掘削悍の軸
芯間距離を伸縮自在な軸芯可変装置を具備し、該両掘削
悍の攪拌羽根が稼働中互いに接触干渉しないように両攪
拌羽根の回転角度を制御する同期機構を備え、該攪拌羽
根間の中間高さ位置で両端がそれぞれ該掘削悍に遊嵌さ
れ該両掘削悍同志を連結する水平で伸縮自在な泥***回
り防止部材を配設し、最下部に先端が略下方に突出する
鋭利な刃物を有する回転自在な掘削翼を備えるととも
に、前記固化材注入装置に接続された固化材吐出ノズル
を配設し、 該固化材注入装置は、固化材サイロと固化材移送用の固
化材ポンプまたはコンプレッサと前記固化材吐出ノズル
に接続される固化材輸送用の固化材供給配管とを備えて
なる地盤改良装置。1. A ground improvement device for soft ground, which forms a columnar improved body in which a solidifying material is uniformly mixed in soft ground,
It comprises a ground excavating device, a traveling device formed of a crawler on which the ground excavating device is mounted and moving, and a solidifying material injecting device, and the ground excavating device is laid on a column base that is tiltably erected on the traveling device. A pair of left and right excavators that can be moved up and down by the operation of the hoist along the guide rails that are provided, and a plurality of protrusions that project horizontally at the same height in the radial horizontal direction on the lower side of the excavators. A plurality of stirring blades formed at equal intervals around the circumference of the step are provided, and the sweeping circles of the stirring blades projecting from each of the excavations are overlapped with each other by the distance between the two shafts. In addition to setting the state, equipped with a shaft center variable device capable of expanding and contracting the distance between the shafts of the two excavating blades, and rotating angle of both the stirring blades so that the stirring blades of the both excavating blades do not interfere with each other during operation. Equipped with a synchronizing mechanism for controlling, the intermediate height position between the stirring blades At the bottom, both ends are respectively loosely fitted in the excavator, and horizontal and expandable mud co-rotation preventing members for connecting the excavators are arranged, and a sharp blade whose tip projects substantially downward is provided at the lowermost portion. A solidified material discharge nozzle connected to the solidified material injection device is provided with a rotatable excavation blade, and the solidified material injection device includes a solidified material silo and a solidified material pump or compressor for transferring the solidified material, and A ground improvement apparatus comprising a solidified material supply pipe for transportation of the solidified material connected to a solidified material discharge nozzle. 【請求項２】 軸芯可変装置は、各々の掘削悍を把持す
る把持部と、該両把持部と接続され伸縮自在な連結部
と、油圧シリンダもしくはボールネジ機構からなる該連
結部の伸縮手段とから構成された請求項１記載の地盤改
良装置。2. The shaft center variable device comprises a gripping part for gripping each of the excavations, a connecting part which is connected to the both gripping parts and is expandable and contractible, and an expanding and contracting means for the connecting part which is composed of a hydraulic cylinder or a ball screw mechanism. The ground improvement device according to claim 1, which is composed of: 【請求項３】 軸芯可変装置の伸縮機構を、平行四辺形
リンク機構とする請求項２記載の地盤改良装置。3. The ground improvement device according to claim 2, wherein the expansion / contraction mechanism of the variable axis device is a parallelogram link mechanism.