JP2657864B2 - Ground stirring and mixing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for stirring and mixing mortar, cement milk, powdery and other modifiers into the ground while discharging and injecting the same into the ground in order to enhance the soil resistance of the soft ground. And an apparatus for stirring and mixing the ground.

[0002]

2. Description of the Related Art A large number of stirring and mixing apparatuses of this type have been known in the prior art. In general, a driving shaft rotated by a driving motor and a cutting blade fixed to the lower end of the driving shaft so as to be integrally rotatable. And a stirring blade positioned above the excavation blade and rotatably attached to the drive shaft, and a supply passage for feeding the improving material is provided along the drive shaft. Then, the improving material is conveyed through a supply passage to a discharge port provided at the base portion of the stirring blade, and is discharged into the surrounding soil while further rotating the stirring blade, and mixed and stirred with the soil, To get the ground to be treated

In such a stirring and mixing method, when the stirring blades or excavating blades rotate in the ground, the soil adheres to the stirring blades and the like, and furthermore, the soil in the peripheral portion is integrally formed with the stirring blades and the like in the same direction. (This is called co-rotation). When this co-rotation occurs, a sufficient stirring effect cannot be obtained. Therefore, in this type of agitating and mixing processing apparatus, as disclosed in, for example, Japanese Patent Application Laid-Open No. 62-86220, means for rotating the excavating blade and the agitating blade in opposite directions to each other to prevent corotation is provided. As disclosed in Japanese Patent Publication No. 58-25131, a technique has been proposed in which while applying micro-vibration to the entire drive shaft, adhesion of soil is stopped to prevent co-rotation.

[0004]

However, although the conventional stirring and mixing apparatus can prevent the co-rotation of the soil to some extent, the structure disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 62-86220 does not use a planetary gear device. Since it is used, the structure becomes complicated and there is a problem that it becomes large. On the other hand, the structure disclosed in Japanese Patent Publication No. 58-25131 requires a double pipe (double auger) and a power source for preventing co-rotation of a horizontal vibrator, a vertical vibrator, and the like.
For this reason, the structure is similarly complicated, and there is a problem that the size is increased.

The present invention has been made in view of the above-mentioned problems, and has as its object to stir and mix a ground having a simple structure and a structure capable of efficiently stirring the soil and the improving material without co-rotation. It is to provide a device.

[0006]

In order to achieve the above object, the present invention relates to an apparatus for stirring and mixing a ground, wherein a stirring blade attached to a drive shaft is rotated to mix and stir ground soil and an improving material. The shaft integrally has an eccentric shaft portion eccentric with respect to the rotation center of the drive shaft, in addition to the true shaft portion formed concentrically with the rotation center of the drive shaft,
The stirring blade is fixedly attached to the true shaft portion so as to be integrally rotatable, and the eccentric state is such that a part of a rotation trajectory circle projects outside the rotation trajectory circle of the fixed stirring blade. The rotary stirring blade is rotatably attached to the shaft portion with respect to the eccentric shaft portion. In the above configuration, the eccentric shaft portion is provided at one or more places with the true shaft portion therebetween, and the lower side of the drive shaft is formed in a crankshaft shape due to the presence of the eccentric shaft portion. preferable. Further, in a state where the rotary stirring blade is attached to the eccentric shaft portion, a cylindrical curved portion that covers the outer periphery of the eccentric shaft portion,
It is preferable that a plurality of horizontal wings are integrally formed on an outer periphery of the cylindrical curved portion.

[0007]

According to this construction, when the drive shaft is rotated, the fixed stirring blades on the true shaft portion are integrally rotated, and at the same time, the reaction force of the force for pushing the soil to make the soil rotate together. In addition to the rotating stirring blade, the portion of the rotating stirring blade that protrudes outside the rotation trajectory circle of the fixed stirring blade cuts into the ground or the like, and the reaction force makes the rotating stirring blade different from the fixed stirring blade. Acts as a force to rotate in the movement. Therefore, the fixed stirring blade performs normal general rotation by the rotation of the drive shaft, but the rotating stirring blade does not use other power, and a force that tries to rotate by a different motion from the fixed stirring blade. Will receive. Therefore, the co-rotation of the soil during this period can be stopped, and more efficient stirring can be performed. Further, the presence of the eccentric shaft portion also contributes to the stirring, so that more efficient stirring can be performed.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention at the time of excavation, and FIG. 2 is a sectional view taken along line AA of FIG. 1 and 2, the apparatus has a drive shaft 1 rotated by a drive motor (not shown). The drive shaft 1 has a true shaft portion 1A provided concentrically with the rotation center 21.
An eccentric shaft portion 1B eccentric to the rotation center 21 by a dimension L, and an eccentric shaft eccentric to the rotation center 21 by a size L from a position shifted from the eccentric shaft portion 1B in the rotation direction by 120 degrees. Part 11B, eccentric shaft part 1B and eccentric shaft part 11
The eccentric shaft portion 1 eccentric by a dimension L with respect to the rotation center 21 from a position shifted by a rotation method of 120 degrees with respect to B.
11B together with a substantially crankshaft. In addition,
It is an essential requirement that the eccentric shaft portions 1B, 11B, 111B be eccentric with respect to the rotation center 21 of the drive shaft 1.
Using a circular block, a through hole may be provided at a position deviated from the center of the circular block, and may be fixedly provided around the true shaft portion 1A through the through hole, and may be provided in two places or four or more places. Good.

A fluid passage 2 (see FIGS. 2 and 3) for flowing mortar, cement milk, powdery and granular improving material, etc., which is injected into the soil during rotary excavation. Each of the shaft portions 1A, 1B, 11B, and 111B is formed so as to communicate with the shaft portions 1A, 1B, 11B, and 111B, and a discharge port (not shown) for discharging the improving material sent through the fluid passage 2 is formed.

[0010] More specifically, the excavating wing 3 includes a drive shaft 1.
And a pair of wing portions 3A and 3B fixedly attached to the peripheral surface of the true shaft portion 1A at the lower end of the wing portion 3A.

The fixed stirring blade 4 is fixedly mounted on the peripheral surface of the true shaft portion 1A above the excavation blade 3, and is composed of a pair of blade portions 4A and 4B. Further, the fixed stirring blades 4 are scattered in a vertical direction in a plurality of stages (three stages in the present embodiment).
Is provided.

The rotary stirring blade 5 is provided with each eccentric shaft portion 1B, 11
The rotary stirring blades 5 in the eccentric shaft portions 1B, 11B, 111B are formed in the same structure. Further, the eccentric shaft portions 1B, 11B, 11 to which the respective rotary stirring blades 5 are attached.
A flange-shaped portion 6 for positioning the rotary stirring blade 5 in the vertical direction is integrally formed on the peripheral surface of 1B.

The rotary stirring blade 5 will be further described with reference to FIG. 3. FIG. 3 is an exploded view showing a portion corresponding to line AA in FIG. In FIG. 3, the rotary stirring blade 5
Are constituted by a pair of rotary stirring blade halves 5A and 5B which are abutted with each other and thereafter fastened by bolts 7 and nuts 8. In addition, this pair of rotary stirring blade halves 5
A and 5B are formed symmetrically, and FIGS. 4 and 5 show the rotary stirring blade halves 5A and 5B alone. Further, a curved portion 9 for fitting the eccentric shaft portions 1B, 11B, 111B is formed in a central portion of each of the rotary stirring blade halves 5A, 5B. The horizontal wing part 10 is formed integrally.

The two rotary stirring blade halves 5A,
When assembling 5B together, first, the curved portions 9 are arranged between the flange portions 6 in a state of facing each other, corresponding to the eccentric shaft portions 1B, 11B, 111B. Then, after this, the bolt 7 is passed through the through hole 11 (see FIG. 4), and further tightened with the nut 8 on the opposite side, so as to be rotatable as one rotary stirring blade 5 on each of the eccentric shaft portions 1B, 11B, 111B. Attached to. Then, the eccentric shaft portions 1B, 11B, 111B are rotated and stirred on the eccentric shaft portions 1B, 11B, 111B, respectively, in a state where the eccentric shaft portions 1B, 11B, 111B are extended outward at substantially right angles from positions on the peripheral surface shifted by approximately 120 degrees. A wing 5 is provided. Note that the rotary stirring blade 5 may have a configuration in which a plurality of horizontal blade portions 10 are protruded from cylindrical members corresponding to the two curved portions 9.

FIG. 2 shows the dimensional relationship of the main members configured as described above. Assuming that the drive shaft 1 rotates about the rotation center 21, the eccentric shaft portions 1B,
The rotation locus circle drawn by 11B111B is indicated by reference numeral 12 (hereinafter simply referred to as “rotation locus circle 12”),
Is the reference numeral 13 (hereinafter, simply referred to as “rotational trajectory circle 13”), and the maximum rotation trajectory circle drawn by the rotary stirring blade 5 is denoted by the reference numeral 14 (hereinafter, simply referred to as “the rotational trajectory circle 14”). , The rotation locus circle 14 of which is the original ground 15
It is in a state of being bitten inside.

Next, the operation of the above-structured mixing apparatus will be described. First, assuming that the drive shaft 1 is rotated in the direction of arrow 16 in FIG. 2 by a drive motor (not shown) while discharging the improving material from a discharge port (not shown), the excavating blade 3 and the fixed stirring blade 4 are integrally formed therewith. Also starts rotating while cutting the soil in the direction of arrow 16. At the same time, the rotary stirring blade 5 also attempts to rotate in the direction of arrow 16, but the rotation locus circle 14 (a part of the rotary stirring blade 5) cuts into the original ground 15, and the friction stirrer 5 generates friction. The force and the reaction force of the rotary stirring blade 5 to cut the soil are respectively applied to the rotary stirring blade 5, and are opposite to the rotation directions of the drive shaft 1, the excavating blade 3, and the fixed stirring blade 4 in FIG. 2. Rotation in the direction indicated by arrow 17 of
That is, it rotates. Thereby, the rotational force from the fixed stirring blade 4 and the rotational force from the rotary stirring blade 5 cancel each other,
The rotation of the soil during this period is stopped. Therefore, the forced stirring by the stirring blades 4 and 5 is efficiently performed. In the stirring, the eccentric shaft portions 1B, 11B, eccentric to the crankshaft shape,
The stirring by the rotation of 111B is also added, and the stirring efficiency is further improved. The present invention is, of course, not limited to this embodiment, but can be modified within the scope described in the claims.

[0017]

As described above, according to the ground stirring and mixing apparatus of the present invention, when the drive shaft and the fixed stirring blades rotate, the rotating stirring blades are fixed without using any other power. By receiving a force that tends to rotate with a movement different from that of the stirring blade, the co-rotation of the soil during this period is stopped, and more efficient stirring can be performed. Further, the presence of the eccentric shaft portion also contributes to stirring, and an effect such as more efficient stirring can be expected. Needless to say, the stirring and mixing apparatus according to the present invention can be used as an apparatus for improving soft ground.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention at the time of excavation.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an exploded perspective view of a portion corresponding to line AA in FIG. 1;

FIG. 4 is a top view of a single rotating stirring blade half.

FIG. 5 is a side view taken along the line BB of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive shaft 1A True shaft part 1B Eccentric shaft part 11B Eccentric shaft part 111B Eccentric shaft part 3 Drilling blade 4 Fixed stirring blade 5 Rotating stirring blade 9 Curved part 10 Horizontal blade part 13 Rotation locus circle (rotation locus circle of fixed stirring blade) 14) Rotation locus circle (rotation locus circle of rotary stirring blade) 21 Rotation center

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Matsuzawa 2114-7 Kotsutsumi, Sowa-cho, Sarushima-gun, Ibaraki Pref. (72) Inventor Hisashi Shizawa 6-2-502 Toyooka, Tama-shi, Tokyo (72) Akira Miyoshi Inventor Hiroshi 1758 Kasama Building 202 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Shigeyuki Sakai 592-6 Kawana, Fujisawa-shi, Kanagawa Prefecture (56) References JP-A-2-178414 (JP, A)

Claims (3)

(57) [Claims] 1. A stirring blade attached to a drive shaft is rotated,
In a stirring and mixing processing apparatus for ground that mixes and mixes ground soil and an amendment material, the drive shaft is , other than a true shaft portion formed concentrically with the rotation center of the drive shaft, with respect to the rotation center of the drive shaft. while integrally has a decentered eccentric shaft portion, wherein the stirring blade, the fixed stirring blade mounted integrally rotatably fixed to the true shank, a portion of the rotation trajectory circle the fixed the eccentric shaft portion so as to protrude outward from the rotational locus yen agitating blades, ground, characterized in that it is constituted by a rotating stirring blades attached rotatably relative to the eccentric shaft Stirring and mixing equipment. 2. The eccentric shaft portion is arranged with the true shaft portion therebetween.
And the lower side of the drive shaft is
Claimed to be shaped like a crankshaft due to the presence of the eccentric shaft
Item 2. A ground stirring and mixing apparatus according to Item 1. 3. The rotary stirring blade is attached to the eccentric shaft.
Cylindrical curved portion that covers the outer periphery of the eccentric shaft portion
And a plurality of waters integrally projecting from the outer periphery of the cylindrical curved portion.
The stirring and mixing treatment of the ground according to claim 1, comprising a flat wing portion.
apparatus.