JP3036702U - Mixing and stirring device for ground improvement machine - Google Patents

Abstract

(57) [PROBLEMS] To provide a mixing and stirring device for a soil improvement machine having a simple structure capable of preventing the co-rotation phenomenon of soil and obtaining an excellent mixing and stirring effect. A stirring rod (2) rotated by an excavation device is provided, a solidification material supply passage (2a) is formed in the stirring rod (2) in an axial direction, and the stirring rod (2) is provided at the tip of the stirring rod (2). Is formed with a solidified material ejection hole (2b) communicating with the solidified material supply passage (2a), and further, an excavation blade (3) is formed at the tip on the outer periphery of the stirring rod (2), and A plurality of inclined stirring blades (4) were fixed to the upper portion, and at least one co-rotation preventing blade (5) reversely inclined to the inclined stirring blades (4) was rotatably provided on the stirring rod (2). A mixing and stirring device (1) for a soil improvement machine, which mixes and stirs the soil and the solidified material.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a mixing and stirring device for mixing and stirring soil and solidified material while pouring solidified material into the ground to improve the ground.

[0002]

[Prior art]

 Various ground improvement methods have been adopted to improve soft ground and increase bearing capacity. While excavating with a mixing and stirring device and injecting coagulant such as cement milk and hardening agent, the excavated soil and coagulant are mixed and stirred by the stirring blades of the rotating stirring rod, and the soft ground is removed. An improved construction method has been adopted.

FIG. 2 is a schematic view of a conventional mixing and stirring apparatus used in the ground improvement method, FIG. 2- (a) is a schematic view seen from the front, and FIG. 2- (b) is FIG. 2- (a). FIG. 2 is a schematic view of a state in which the mixing and stirring device 1 is rotated by 90 degrees from FIG. 2. The mixing and stirring device 1 is equipped with a stirring rod 2 that is rotated by an excavation device (see FIG. 4). A solidified material supply passage 2a for supplying the solid material is formed, and a solidified material jet hole 2b communicating with the solidified material supply passage 2a is formed at the tip of the stirring rod 2.

An excavation blade 3 having an excavation blade 3 a at its tip is fixed to the outer periphery of the stirring rod 2, and a plurality of stirring blades 4 are inclined with respect to the stirring rod 2 at intervals above the excavation blade 3. Have been fixed. Further, in addition to the inclined stirring blade 4, a co-rotation preventing blade 5 described later is provided vertically and rotatably on the stirring rod 2.

FIG. 3 is an overall view of the mixing and agitating device of the ground improvement machine. The excavation device 7 is suspended from the leader 6a of the base machine 6 so as to be vertically movable, and the excavation device 7 is shown in FIG. A mixing and stirring device 1 for excavating the ground and mixing the soil and the solidified material is installed. As shown in FIG. 2, the mixing and stirring apparatus 1 is composed of a stirring blade 4 and a stirring rod 2 having an excavation blade 3 at the tip, and the stirring rod 2 is rotated by a hydraulic motor of the excavation device 7.

FIG. 4 is a process diagram of land improvement by a mixing and agitating device. After the mixing and agitating device 1 hung on the base machine 6 is positioned and set at a place for ground improvement, the excavation device 7 rotates the excavation blades 3. While advancing, the coagulant such as cement milk and hardening agent is injected from the coagulant spouting hole 2b at the tip of the stirring rod 2, and the stirring blade 4 forcibly stirs the coagulated material and the excavated soil, After excavating to a depth of 1, the stirring rod 2 is rotated in the reverse direction and the mixing and stirring device 1 is pulled out upward, so that a column (improved solidified body) 8 solidified by the solidifying material is formed, and the ground is improved.

However, in the conventional mixing and stirring apparatus, especially in the case of the ground having adhesive force, a phenomenon (co-rotation phenomenon) occurs in which the excavated soil turns into a dumpling state and rotates together with the stirring apparatus, which improves the coagulating material. There was a drawback that the soil could not be mixed and stirred sufficiently, and the soil remained as it was without mixing with the coagulant, or that a column in which the outer periphery was solidified into a shell was formed.

Therefore, in order to prevent the co-rotation phenomenon and promote the mixing, as shown in FIG. 2, the co-rotation preventing blade 5 is provided so as to be vertically rotatable with respect to the stirring rod 2. . This is to prevent the co-rotation of the soil by stopping the co-rotation prevention wing by earth pressure.

[0009]

[Problems to be solved by the device]

 However, as shown in Fig. 2, even if the co-rotation prevention wing is provided, if the co-rotation prevention wing is stationary, the co-rotation prevention wing rotates together with the soil, especially in the case of the ground with adhesive force. However, there is a disadvantage that the soil and the coagulant cannot be sufficiently stirred and mixed.

Therefore, the present invention provides a mixing and agitating device for a soil improvement machine having a simple structure capable of preventing a co-rotation phenomenon of soil and obtaining an excellent mixing and agitating effect.

[0011]

[Means for Solving the Problems]

 The mixing and agitating device of the ground improvement machine for mixing and agitating the soil and the coagulant according to the present invention is equipped with a stirring rod which is rotated by the excavating device, and the coagulant supply passage is formed in the axial direction inside the stirring rod. , A tip of the stirring rod is formed with a coagulation material injection hole communicating with the coagulation material supply passage, a drilling blade is formed on the tip of the circumference of the stirring rod, and a plurality of inclined stirring blades are formed on the upper part of the drilling blade. It is characterized in that the stirring rod is fixed, and at least one co-rotation preventing vane that is inclined against the inclined stirring vane is rotatably provided on the stirring rod.

It is desirable that the length of the co-rotation prevention blade be larger than the length of the inclined stirring blade.

In addition, it is desirable to provide a reversely inclined stirring blade next to the excavation blade.

[0014]

[Embodiment of the invention]

 1 is a schematic view of a mixing and stirring apparatus of the present invention, FIG. 1- (a) is a schematic view seen from the front, and FIG. 1- (b) is a schematic view in a state rotated by 90 degrees from FIG. 1- (a). In FIG. 1, the mixing and stirring device 1 in FIG. 1 includes a stirring rod 2 which is rotated by the excavation device 7, and the stirring rod 2 is connected to the excavation device 7 (see FIG. 3) and rotated by the excavation device 7. .

A coagulant supply passage 2a for supplying coagulant such as cement milk in the axial direction is formed inside the agitation rod 2, and a coagulant spout that leads to the coagulant supply passage 2a is formed at the tip of the agitation rod 2. The hole 2b is formed.

A digging blade 3 having a plurality of digging blades 3 a is provided at the tip of the stirring rod 2.

On the upper part of the excavation blade 3, a plurality of inclined stirring blades 4 are fixed to the stirring rod 2 at intervals. The stirring blade 4 bites downward by rotation during excavation, and is inclined and fixed to the stirring rod 2 so as to scoop up the excavated soil.

On the upper part of the excavation blade 3, an inclined stirring blade 4 and a co-rotation preventing blade 5 inclined in the opposite direction are rotatably provided on the stirring rod 2. As for the co-rotation preventing blade 5, in the present embodiment, one co-rotation preventing blade 5 is provided directly above the excavation blade 3, but like the inclined stirring blade 4, a plurality of co-rotation preventing blades are inclined. You may provide with the stirring blade 4 by turns.

Further, by making the length of the co-rotation prevention blade slightly larger than that of the inclined stirring blade, it is possible to prevent co-rotation and to efficiently mix and stir the excavated soil and the solidified material. it can.

The method of using the mixing and stirring apparatus according to the present invention is the same as that of the conventional mixing and stirring apparatus described above, and as shown in FIG. 3, the mixing and stirring apparatus 1 hung on the base machine 6 is installed at a place for ground improvement. After positioning and setting, while the excavation device 7 rotates the excavation blade 3 to advance, the coagulant such as cement milk or hardening agent is supplied to the coagulant supply passage 2a in the stirring rod 2 to solidify the tip of the stirring rod. The coagulated material is ejected from the material ejecting hole 2b, the coagulated material and the excavated soil are forcibly stirred by the stirring blade 4, and after excavating to a predetermined depth, the stirring rod 2 is reversely rotated and the stirring device is pulled out upward. , A column solidified by the solidified material is formed.

In the mixing and stirring apparatus according to the present invention, when the solidified material and the excavated soil are mixed and stirred, the anti-rotation blade 5 receives earth pressure during excavation and rotates in the opposite direction to the stirring blade 4. Therefore, as the stirring blade 4 rotates, it rotates while cutting into the mixture of soil and coagulant that is about to rotate, and as a result, the soil is prevented from forming a dumpling state, and the co-rotation phenomenon disappears. The mixing and stirring of the soil and the coagulant is further promoted.

[0022]

[Effect of the invention]

 In the present invention, since the co-rotation prevention blade is installed on the stirring rod so that the co-rotation prevention blade is tilted in the opposite direction to the stirring blade, the co-rotation prevention blade rotates in the direction opposite to the stirring blade due to the earth pressure, so that In addition to suppressing the rotation of the soil, the co-rotation prevention blade can be cut into the soil to promote the mixing and stirring of the soil and the solidified material, and to form a uniform and uniform column.

[Brief description of the drawings]

1 is a schematic view of a mixing and stirring apparatus of the present invention, FIG.
1A is a schematic view seen from the front, and FIG. 1-B is FIG. 1-
It is the schematic of the state rotated 90 degrees from (a).

FIG. 2 is a schematic view of a conventional mixing and stirring device, and FIG.
FIG. 2A is a schematic view seen from the front, and FIG.
It is the schematic of the state rotated 90 degrees from (a).

FIG. 3 is an overall view of a mixing and stirring device of the ground improvement machine.

FIG. 4 is a process diagram of land improvement using a mixing and stirring device.

[Explanation of symbols]

 1 Mixing and stirring device 2 Stirring rod 2a Solidified material supply passage 2b Solidified material jet hole 3 Excavation blade 3a Excavation blade 4 Stirring blade 5 Co-rotation prevention blade 6 Base machine 6a Leader 7 Excavation device 8 Column (improved solid body)

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[Procedure amendment]

[Submission date] November 28, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

Claims (3)

[Utility model registration claims] 1. A mixing and stirring device of a ground improvement machine for mixing and stirring soil and coagulant comprises a stirring rod rotated by an excavation device, and a coagulant supply passage is formed in an axial direction inside the stirring rod. At the same time, a jet of solidified material communicating with the solidified material supply passage is formed at the tip of the stirring rod, a drilling blade is formed at the tip of the outer circumference of the stirring rod, and a plurality of inclined stirring blades are formed at the upper part of the drilling blade. And a mixing stirring device for a soil improvement machine for mixing and stirring soil and coagulant, characterized in that at least one co-rotation preventing vane that is inclined and reversely inclined is rotatably provided on the stirring rod. . 2. The mixing and stirring device for a ground improvement machine according to claim 1, wherein the length of the co-rotation preventing blade according to claim 1 is larger than the length of the inclined stirring blade. 3. The mixing and agitating device for a ground improvement machine according to claim 1, wherein an inversely inclined agitating blade is provided next to the excavating blade.