JPH09221740A - Mixing agitation blade device of excavated soil in ground improving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mixing and agitation by mounting an excavation blade and an agitation blade on an excavation shaft and mounting turnably a socket between the excavation blade and the agitation blade and mounting a preventive blade on the socket. SOLUTION: An excavation blade 11 is mounted at the tip of an excavation shaft 10 while an agitation blade 12 is mounted on the upper part of the shaft. A together turning preventive blade 13 is turnably provided between the agitation blade 12 and the excavation blade 11. This preventive blade 13 is provided with a horizontal blade 27 whose diameter is below that of the excavation blade 11 with an upward blade 28 and a downward blade 29. When a hole is bored with the excavation blade 11 by turning the excavation shaft 10, the excavated soil on the upper part of the excavation shaft 11 is turned in a tangled manner so that it may be placed in a turbulent flow state. Or the excavation between the horizontal blade 27 and the agitation blade 12 is in a laminar or steady flow state. Since the resistance received from the excavated soil of the downward blade 29 is different from the resistance received from the upward blade 28 resultant from this, the preventive blade 13 fails to turn at the same speed with the blade 11, which prevents the excavated soil near the blade 11 from turning together with the excavated soil near the blade 12 at the same speed. This construction makes it possible to mix and agitate the excavated soil with the filling material to a satisfactory extent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mechanically mixing soil and filler material in foundation work and consolidating the same.
The present invention relates to a mixing and stirring blade device for cutting soil in a ground improvement machine that improves the ground into a cylindrical shape.

[0002]

2. Description of the Related Art A mixing and stirring blade device for cutting soil in a ground improvement machine for improving the ground into a cylindrical shape is, for example, Japanese Patent Publication No.
The thing shown in 8-29374 is known.

As shown in FIG. 1, this cutting soil mixing and stirring blade device has an excavation blade 2 having a predetermined excavation diameter Da on an excavation shaft 1, and an excavation blade 2 located above the excavation blade 2. A plurality of stirring blades 3 having substantially the same diameter as the above are fixed in the upper and lower stages.
On the other hand, between the excavating blade 2 and the stirring blade 3 of the excavating shaft 1 and between the upper and lower stirring blades 3, a co-rotation preventing blade 4 which is rotatable about the excavating shaft 1 and has a diameter Db larger than the excavating diameter Da. Has been inserted.

With the above-mentioned mixing and stirring blade device for cutting soil,
Since the co-rotation preventing blade 4 bites into the peripheral wall of the hole 5 formed by the excavating blade 2 and does not rotate, the cutting soil is injected near the co-rotation preventing blade 4 without co-rotating with the excavating blade 2 and the stirring blade 3. It is possible to satisfactorily mix and stir filler such as cement milk and cutting soil.

[0005]

According to the above-mentioned mixed agitating blade device for cutting soil, the co-rotation preventing blade is used when the excavating blade 1 is rotated and propelled to excavate the ground to drill a hole. Four
Is pushed into the unexcavated ground, the required propulsive force of the excavation shaft 1 is significantly increased, and the co-rotation preventing blade 4 may be bent or chipped due to the reaction force pushing it into the unexcavated ground.

Therefore, an object of the present invention is to provide a mixing and stirring blade device for cutting soil in a ground improvement machine which can solve the above-mentioned problems.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a ground for improving the ground into a columnar shape by propelling and pulling out while rotating an excavation shaft provided with an excavation blade and a stirring blade to mix and agitate the excavated soil and the filler. In the improved machine, the excavating blade 11 and the stirring blade 12 are attached to the excavating shaft 10.
A boss 23 is rotatably mounted on the digging shaft 10 between the digging blade 11 and the stirring blade 12, and a plurality of blades having a diameter equal to or smaller than that of the digging blade 11 are horizontally attached to the boss 23. It is a mixing and stirring apparatus for excavated soil in a ground improvement machine, characterized in that the co-rotation preventing blades 13 are attached by shifting the positions vertically with respect to the position.

According to the present invention, the co-rotation preventing blade 13 does not co-rotate with the excavating blade 11 at the same speed.
Since the excavated soil nearby and the excavated soil near the stirring blade 12 do not co-rotate at the same speed, the excavated soil and the filler can be mixed and stirred well. Moreover, since the co-rotation preventing blade 13 has a diameter equal to or smaller than the diameter of the excavation blade 11, the co-rotation preventing blade 13 is pushed into the excavated soil, so that the required propulsive force of the excavation shaft 10 does not become large and the pushing reaction force The co-rotation preventing wing 13 does not bend or break.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 2, an excavating blade 11 is attached to the tip of an excavating shaft 10, and a stirring blade 12 is attached to an upper portion of the excavating blade 11. This stirring blade 12
The anti-corotating wing 13 is provided between the digging shaft 10 and the digging wing 11.
It is provided to be rotatable around. The excavating shaft 10 has a hollow shape. The excavating shaft 10 is propelled while rotating, and a filling material such as cement milk is injected into the hollow portion 10a.

The excavation blade 11 has a pair of blades 1 attached to a mounting portion 14.
5, the mounting portion 14 is connected to the flange 16 of the excavating shaft 10 by a bolt 17, and the mounting portion 14 has a nozzle 18 that communicates with the hollow portion 10a of the excavating shaft 10.
Is formed.

Because of this, the excavation blade 11 can be removed from the excavation shaft 10 by loosening the bolt 17, and the excavation blade 11 can be removed by tightening the bolt 17.
Since it can be attached to 0, it can be easily replaced when the excavation blade 11 is damaged.

The stirring blade 12 includes a first blade 19 on the excavation shaft 10.
And the second blade 20 are fixed to each other.
The blades 20 are oblique to the left and right in parallel with the axis of the excavation shaft 10.

The excavating blade 11 and the agitating blade 12 of the excavating shaft 10
Between the upper and lower flanges 2 as shown in FIGS. 2 and 3.
A tubular body 22 provided with 1 is fixed, and a boss 23 is rotatably fitted and attached to the tubular body 22. This boss 2
Reference numeral 3 denotes a ring shape composed of a semicircular first boss 24 and a semicircular second boss 25, and connecting pieces 26 are fixed to the first boss 24 and the second boss 25, respectively.

Horizontal vanes 27, upward vanes 28, and downward vanes 29 are fixed to the first boss 24 and the second boss 25, respectively, and the horizontal vanes 27 of the first boss 24 and the connecting pieces 26 of the second boss 25 are fixed to each other. Are connected by bolts 30, and the horizontal wing 27 of the second boss 24 and the connecting piece 26 of the first boss 24 are connected by bolts 31 to connect the first boss 24 and the second boss 25 to form a ring shape. The boss 23 is provided, and the anti-rotation blade 13 is rotatably provided around the excavation shaft 10.

Because of this, the pair of horizontal blades 27 project radially opposite to each other to form a horizontal blade having a diameter equal to or smaller than that of the excavation blade 11, and the pair of upward blades 28 face each other in the radial direction. Projecting to become an upward blade having a diameter equal to or smaller than that of the excavating blade 11, and a pair of downward blades 29 projecting radially opposite to each other to become a downward blade having a diameter equal to or smaller than that of the excavating blade 11.

Further, if the bolts 30 and 31 are loosened, the first boss 24 and the second boss 25 can be separated to remove the co-rotation preventing blade 13 from the excavation shaft 10, and the bolt 30
By tightening the bolt 31 with the first boss 24 and the second boss 25
Since the co-rotation preventing vanes 13 can be rotatably attached to the excavation shaft 10 by being connected to each other, the co-rotation preventing vanes 13 can be easily attached to and removed from the excavation shaft 10.

Next, the mixing and stirring operation will be described. Drilling axis 10
By excavating and excavating the ground with the excavation blade 11 by rotating the excavation blade, the excavated soil on the upper part of the excavation blade 11 (between the excavation blade 11 and the horizontal blade 27) circulates together with the excavation blade 11. A violent turbulent state occurs, and the excavation between the horizontal blade and the stirring blade 12 becomes a slow static flow state.

For this reason, the resistance of the downward blade 29 from the excavated soil differs from the resistance of the upward blade 28 from the excavated soil, so that the co-rotation prevention blade 13 does not rotate at the same speed as the excavating blade 11, and the excavation blade 11 does not rotate. Since the excavated soil near the blade 11 and the excavated soil near the mixing blade 12 do not rotate at the same speed,
The excavated soil and the filled filler can be mixed and stirred well.

Further, the diameter of the anti-rotation blade 13 is equal to that of the excavation blade 1.
Since the diameter is 1 or less, the co-rotation preventing blade 13 is pushed into the excavated soil and cannot be pushed into the unexcavated ground.
The propulsive force of the excavation shaft 10 does not become large, and the co-rotation preventing blade 13 does not bend or break.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional mixing and stirring blade device.

FIG. 2 is a front view showing an embodiment of the mixing and stirring blade device of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Excavation axis 2 ... Excavation blade 3 ... Agitation blade 4 ... Co-rotation prevention blade 10 ... Excavation axis 11 ... Excavation blade 12 ... Agitation blade 23 ... Boss 27 ... Horizontal blade 28 ... Upward blade 29 ... Downward blade

Claims (1)

[Claims] 1. A ground improvement machine for improving the ground into a columnar shape by mixing and agitating the excavated soil and the filling material by propelling and extracting while rotating the excavating shaft provided with the excavating blade and the agitating blade. The excavation blade 11 and the agitation blade 12 are attached, and the boss 23 is rotatably attached to a position between the excavation blade 11 and the agitation blade 12 on the excavation shaft 10, and the diameter of the boss 23 is equal to or smaller than that of the excavation blade 11. Co-rotation prevention wing 1
3. A mixing and stirring device for excavated soil in a ground improvement machine, characterized in that