JP3612684B2 - Double rotating shaft type ground mixing and processing equipment - Google Patents

Description

になると考えられ、この際の土の動きは、例えば、楔５の頂点より下側にあった土は、楔５の１辺を半径とする円弧に沿って、当初は下方に押しやられ、順次攪拌翼の後方へと追いやられるような動きとなる。
【０００８】
図４は、外軸１の攪拌翼３と内軸２の攪拌翼４が反対方向に回転する際の、攪拌翼３の前方の土の下方への動きと攪拌翼４の前方の土の上方への動きを示しているが、攪拌翼３，４間の上下方向の間隔Ｓが
【数３】

の場合（ＳがＷ１とＷ２の和より大きい場合）は、攪拌翼３，４が大きく上下に離れ過ぎていて、攪拌翼３が土を下方に押しやる巾と攪拌翼４が土を上方に押しやる巾とが相互に重ならないため、攪拌翼３，４を逆回転させることの効果が得られない。
【０００９】
また、間隔Ｓが
【数４】

の場合（ＳがＷ１とＷ２の最大のものより小さい場合）は、攪拌翼３が土を下方に押しやろうとする力、或いは、攪拌翼４が土を上方に押しやろうとする力が、相手側攪拌翼に当たることで減殺されるため、攪拌翼３，４を逆回転させることの効果が減少する。
【００１０】
これに対して、間隔Ｓが前記式（１）を満足している本発明の装置の場合（Ｓが、Ｗ１とＷ２の最大のものに等しいかそれよりも大きく、Ｗ１とＷ２の和に等しいかそれよりも小さい場合）は、攪拌翼３が土を下方に押しやる巾と攪拌翼４が土を上方に押しやる巾とが相互に重なり、下方への土の動きと上方への土の動きとがぶつかりあって、土が複雑な動きをすることになるので、攪拌翼３，４を逆回転させることの効果が十分に発揮され、上下の土同士、および、土と地盤改良材との攪拌混合効果が著しく向上する。
【図面の簡単な説明】
【図１】本発明の装置における回転軸の要部の正面図である。
【図２】同じく側面図である。
【図３】攪拌翼による土の移動の基本的説明図である。
【図４】本発明の装置における上下の攪拌翼による土の移動の状態図である。
【符号の説明】
１：外軸、２：内軸、３：攪拌翼、４：攪拌翼、５：楔。[0001]
[Technical field to which the invention belongs]
The present invention relates to a double-rotating shaft type ground stirring and mixing apparatus.
[0002]
[Prior art]
2. Description of the Related Art A double rotating shaft type ground agitating and mixing apparatus in which agitating blades projecting at lower ends of both inner and outer shafts are rotated in opposite directions to agitate and mix ground soil and ground improvement material is conventionally known. However , no particular consideration is given to the vertical distance between the stirring blades on both the inner and outer shafts.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention (the object of the present invention) is to provide a double rotating shaft type ground which can significantly improve the stirring and mixing effect by specifying the vertical distance between the stirring blades of the aforementioned inner and outer shafts An object of the present invention is to provide a stirring and mixing apparatus.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the double rotating shaft type ground stirring and mixing apparatus of the present invention (hereinafter simply referred to as the apparatus of the present invention), the vertical distance between the stirring blades of the inner and outer shafts rotating in opposite directions to each other Satisfies the formula (1).
[0005]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 showing the main part of the rotating shaft in the apparatus of the present invention, 1 is an outer shaft of the rotating shaft, 2 is an inner shaft, and the outer shaft 1 is, for example, a turntable system and an inner shaft. The shaft 2 is, for example, a motor attached to the upper end and is rotated in opposite directions.
[0006]
At the lower end of the outer shaft 1 and at the lower end of the inner shaft that passes through the outer shaft 1 and protrudes downward, stirring blades 3 and 4 are respectively projected in the radial direction. Is provided with a discharge port (not shown) for ground improvement material such as cement milk, and the agitating blades 3 and 4 that rotate in opposite directions when the rotary shaft penetrates into and out of the ground, and the ground soil and the above-mentioned The ground improvement material discharged from the discharge port is stirred and mixed.
[0007]
Applying the generally known support force theory based on plastic deformation, when the stirring blade rotates in the horizontal direction in the ground, a soil wedge 5 is formed on the front surface, and this wedge 5 rotates. When it is considered that the soil in front of the direction is moved up and down as shown in FIG. α is 45 °, and the width W of the soil that moves up and down is

The movement of the soil at this time is, for example, the soil below the apex of the wedge 5 is initially pushed downward along an arc whose radius is one side of the wedge 5, The movement is driven to the rear of the stirring blade.
[0008]
FIG. 4 shows the downward movement of the soil in front of the stirring blade 3 and the top of the soil in front of the stirring blade 4 when the stirring blade 3 of the outer shaft 1 and the stirring blade 4 of the inner shaft 2 rotate in opposite directions. The vertical spacing S between the stirring blades 3 and 4 is expressed as follows:

In the case of (S is greater than the sum of W1 and W2), the stirring blades 3 and 4 are too far apart vertically, and the stirring blade 3 pushes the soil downward and the stirring blade 4 pushes the soil upward. Since the width does not overlap with each other, the effect of rotating the stirring blades 3 and 4 in the reverse direction cannot be obtained.
[0009]
Also, the interval S is

(S is smaller than the maximum of W1 and W2), the force that the stirring blade 3 tries to push the soil downward or the force that the stirring blade 4 tries to push the soil upward is Since it is killed by hitting the side agitating blade, the effect of reversely rotating the agitating blades 3 and 4 is reduced.
[0010]
On the other hand, in the case of the device of the present invention in which the distance S satisfies the formula (1) (S is equal to or greater than the maximum of W1 and W2, and is equal to the sum of W1 and W2 Or smaller), the width of the stirring blade 3 pushing the soil downward and the width of the stirring blade 4 pushing the soil upward overlap each other. As the soil collides with each other and the soil moves in a complicated manner, the effect of rotating the stirring blades 3 and 4 in the reverse direction is sufficiently exerted, and stirring between the upper and lower soils and between the soil and the ground improvement material is performed. The mixing effect is significantly improved.
[Brief description of the drawings]
FIG. 1 is a front view of a main part of a rotating shaft in an apparatus of the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is a basic explanatory view of soil movement by a stirring blade.
FIG. 4 is a state diagram of soil movement by upper and lower stirring blades in the apparatus of the present invention.
[Explanation of symbols]
1: outer shaft, 2: inner shaft, 3: stirring blade, 4: stirring blade, 5: wedge.

Claims (1)

The vertical space S between the stirring blades of the inner and outer shafts rotating in opposite directions is given by

A double rotating shaft type ground stirring and mixing treatment device characterized by satisfying

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