JPH09221741A - Mixing agitation blade device of excavated soil in ground improving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a required propulsion force of an excavation shaft from being increased and protect against the bending or breakage of a together turning preventive shaft by providing turnably a first blade whose diameter is identical or below that of an excavation blade at a position close to the excavation blade and providing turnably a second blade whose diameter is identical to or below that of the excavation blade at the upper position separated from the excavation blade. SOLUTION: A first blade 19 whose diameter is identical to or below that of an excavation blade 11 and a second blade 20 are turnably provided in one piece on an excavation shaft at a position near the excavation blade 11 and a position separated therefrom, thereby forming a together turning preventive blade 12. Therefore, in a boring operation which excavates the ground with the excavation blade 11 in an attempt to propel while turnings the excavation shaft 10, the second blade 20 is placed at a rest position of the excavated soil, which increases turning resistance so that the first blade 19 which turns integrally with this second blade 20 will not turn or turn at least at a considerably lower speed than the excavation blade 11. Since the first blade 19 and the second blade 20 are identical to or below that of the excavation blade 11, the together turning preventive blade 12 is pushed into the excavated soil, which prevents the required propulsion force of the excavation blade from being increased.

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 bending or cutting may occur due to the reaction force that pushes the co-rotation prevention blade 4 into the unexcavated ground.

Further, since the excavating blade 2 and the stirring blade 3 are provided on the excavating shaft 1, the rotational resistance of the excavating blade 2 and the rotating resistance of the stirring blade 3 act on the excavating shaft 1, and the rotating resistance of the excavating shaft 1 is increased. big,
Large rotation torque is required.

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

[0008]

DISCLOSURE OF THE INVENTION The present invention is a ground for improving the ground into a columnar shape by propelling and withdrawing 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 excavation blade 11 is attached to the excavation shaft 10, and a first blade 19 having a diameter equal to or smaller than that of the excavation blade 11 is rotatably provided at a position close to the excavation blade 11 on the excavation shaft 10. A second blade 20 having a diameter equal to or smaller than the diameter of the excavating blade 11 is rotatably provided at an upper position separated from the excavating blade 11 on the shaft 10, and the second blade 20 and the first blade 19 are connected integrally. This is a mixing and stirring device for excavated soil in a ground improvement machine, characterized in that the co-rotation preventing blades 12 are rotated.

According to the present invention, when the excavation shaft 10 is rotated and propelled to excavate the ground by the excavation blade 11,
Since the second blade 20 is in the stationary soil part of the excavated soil, the rotation resistance becomes large, and the first blade 19 that rotates integrally with the second blade 20 does not rotate, or at least rotates at a much lower speed than the excavation blade 11. To do. Therefore, the excavated soil and the filler are mixed and stirred well between the first blade 19 and the excavation blade 11.

Further, the first blade 19 of the anti-corotation blade 12,
Since the second blade 20 has a diameter equal to or smaller than that of the excavation blade 11,
Since the co-rotation preventing blade 12 is pushed into the excavated soil, the required propulsive force of the excavation shaft 10 does not become large, and the co-rotation preventing blade 12 is not bent or damaged by the pushing reaction force.

Moreover, since only the rotational resistance of the excavation blade 11 acts on the excavation shaft 10, the rotational resistance of the excavation shaft 10 is small and the excavation shaft 10 can be rotated with a small rotational torque.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 2, an excavation blade 11 is attached to a tip end of an excavation shaft 10, and a co-rotation prevention blade 12 is rotated above the excavation blade 11 around the excavation shaft 10. It is provided freely. The excavation shaft 10 has a hollow shape, and the excavation shaft 10 is propelled while rotating,
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 13.
4, the mounting portion 13 is connected to the flange 15 of the excavating shaft 10 by the bolts 16, and the mounting portion 13 has a nozzle 17 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 16, and the excavation blade 11 can be removed by tightening the bolt 16.
Since it can be attached to 0, it can be easily replaced when the excavation blade 11 is damaged.

The co-rotation preventing blade 12 is formed by fixing a first blade 19 and a second blade 20 to a lower portion and an upper portion of a cylindrical body 18 rotatably provided on the excavation shaft 10, and the first blade 19 excavates. The second blade 20 is close to the blade 11 and is separated from the excavation blade 11.

A lower plate 2 is provided below the excavation shaft 10.
1 is fixed, and the cylindrical body 18 is attached to the upper surface of the lower plate 21.
The lower end surface of the is rotatably in contact. An upper plate 22 is attached to an upper and lower intermediate portion of the excavation shaft 10, and an upper end surface of the tubular body 18 is rotatably contacted with a lower surface of the upper plate 22. As shown in FIG. 3, the upper plate 22 has a pair of semicircular plates 23 connected by bolts 24, and can be easily attached to and removed from the excavation shaft 10.

The first blade 19 has a diameter slightly smaller than that of the excavation blade 11. The second blade 20 has a diameter smaller than that of the excavation blade 11 and is obliquely upward.

Because of this, as shown in FIG. 4, when the excavation shaft 10 is rotated and propelled to excavate the ground with the excavation blade 11 and the hole B is drilled, the excavated soil near the excavation blade 11 is violently shared. The excavated soil that has rotated around the earth becomes gentler as it goes upward, and the excavated soil above the excavated soil to some extent (dimension L in FIG. 4) does not rotate and becomes a stationary soil portion.

Since the second blade 20 is in the stationary soil, the rotation resistance is large and the first blade 19 does not rotate, or at least rotates at a speed much lower than the rotation speed of the excavation blade 11, so that the first blade is not rotated. The excavated soil and the filler are satisfactorily mixed and stirred between 19 and the excavating blade 11.

A second embodiment of the present invention will be described. As shown in FIG. 5, the first blade 19 is formed into a substantially crank shape by the mounting portion 19a, the downward portion 19b, and the horizontal portion 19c, and the mounting portion 19a is fixed to the cylindrical body 18 to fix the horizontal portion 19c to the excavating blade 11.
Closer to.

[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 a first 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;

FIG. 4 is an explanatory diagram of a mixing and stirring operation.

FIG. 5 is a front view showing a second embodiment of the mixing and stirring apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Excavation axis 2 ... Excavation blade 3 ... Stirring blade 4 ... Co-rotation prevention blade 10 ... Excavation axis 11 ... Excavation blade 12 ... Co-rotation prevention blade 19 ... First blade 20 ... Second blade

Claims (1)

[Claims] 1. A ground improvement machine for propelling and extracting while rotating an excavation shaft provided with an excavation blade and a stirring blade to mix and agitate excavated soil and a filling material to improve the ground into a columnar shape. The excavation blade 11 is attached, and a first blade 19 having a diameter equal to or smaller than that of the excavation blade 11 is rotatably provided at a position close to the excavation blade 11 on the excavation shaft 10.
The excavation blade 11 is located at an upper position apart from the excavation blade 11 at
A second blade 20 having a diameter equal to or smaller than the above is rotatably provided, and the second blade 20 and the first blade 19 are connected to be integrally rotated to form the co-rotation preventing blade 12. A mixing and stirring device for excavated soil in a ground improvement machine.