JPS5829375B2 - Mixing stirring blade device for cut soil in soil improvement machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a ground improvement machine that improves the ground into a cylindrical shape by mechanically mixing and solidifying soil and filler in foundation work, etc. The present invention relates to a cutting soil mixing agitation blade device for efficiently performing agitation and mixing.

Conventionally, a ground improvement machine that improves the ground into a columnar shape rotates and excavates an excavation shaft 1 equipped with excavation blades 2 and stirring blades 3 using a predetermined excavation mechanism, as shown in Fig. 1, and rotates the excavation shaft 1 during excavation or pulling out. This is carried out by filling a filler material such as sodium silicate or cement milk at low pressure through a fluid passage (not shown) provided in 1 and forcibly stirring and solidifying it.

However, this type of soil improvement machine first drills holes in the soil using a mixing head, supplies filler material at low pressure into the gaps in the cut soil, and forcibly mixes and stirs the filler material and cut soil. Although it can be easily applied to soil and silt-based ground, it can be applied to clay soils, especially hard clay soils and beet layers, where the stirring blades work together with the soil to be improved, efficiently mixing and stirring the cut soil and filler material. It was something that could not be done.

Therefore, in conventional soil improvement machines, the mixing head was moved back and forth repeatedly to increase the mixing efficiency, which resulted in extremely low work efficiency and increased losses due to the ineffective mixing of the filler material. There was a drawback.

In addition, in order to increase the stirring efficiency, it is necessary to constantly consider the suitability of blending filler materials in accordance with the soil properties, and there are many problems such as the strength of the improved soil being highly dependent on the soil properties.

This invention was made in order to improve the above-mentioned conventional drawbacks, and is the most effective soil improvement machine for improving the ground of sandy soil, silt soil, clay soil, beet layer, or alternate layers thereof. The present invention provides a mixing and stirring blade device for cutting soil.

Hereinafter, one embodiment of the present invention will be explained in detail with reference to FIGS. 2 to 5.

In the figures, parts and parts corresponding to those of the conventional example will be described with the same reference numerals.

FIG. 2 is a longitudinal cross-sectional view showing one embodiment of the present invention, showing the state in which it is dug into the soil.

At the tip of the excavation shaft 1, there are excavation blades 2 having a predetermined excavation diameter Da, and a plurality of stirring blades 3 located above the excavation blades 2 and having approximately the same diameter as the excavation blades 2, arranged vertically in multiple stages. .

On the other hand, above the excavation blade 2 of the excavation shaft 1, there is an arm 6 and an arm 6 for supporting both upper and lower ends. It is rotatably inserted into the excavation shaft 1 via the boss 7.

The length of the cylindrical body 5 included in the above-mentioned kink prevention device 4 is:
The cylindrical body 5 has a length including one or more stages of stirring blades 30. A plurality of resistance plates 8 protruding from the excavation diameter Da are provided on the outer periphery of the cylindrical body 5. On the periphery, mutual kink prevention blades 9 extending near the excavation shaft 1 are provided so as to be located between the stirring blades 30.

In addition, the boss 7 that supports the above-mentioned anti-seize device 4 is provided with a ring attached to the excavation shaft 1 located at the upper and lower portions of the boss 7 to prevent the excavation shaft 1 from moving up and down during digging or extraction of the excavation shaft 1.
0 is fixed.

Next, a case in which ground improvement is carried out using the mixing stirring blade device equipped with the above-mentioned mutual interpolation prevention device 4 will be described in detail.

As shown in the figure, when the excavation shaft 1 to which the excavation blades 2 and stirring blades 3 are fixed is rotatably excavated into the soil using a predetermined excavation mechanism with both the excavation blades 2 and the agitation prevention device 4 attached, the excavation diameter Da will be reduced into the soil. While forming a hole, the anti-slip device 4 having a resistance plate 8 protruding from the excavation diameter Da is propelled into the soil as the excavation shaft 1 excavates without rotating.

Therefore, the soil clod excavated by the excavating blade 2 at the tip of the excavating shaft 1 is integrated with the excavating blade 2, but the above-mentioned anti-slip device 4 is prevented by the resistance plate 8 protruding from the outer periphery. Since it does not rotate, the rotation of the earth clod is stopped by the rotation prevention blades 9 extended on the inner periphery.

That is, since the excavating blades 2 and stirring blades 3 of the excavating shaft 1 are rotating in the same direction regardless of whether the excavating shaft is being excavated or being pulled out, the excavated soil mass is also rotating integrally.

Therefore, the rotation of the clod is temporarily stopped by the curling prevention blades 9 provided between the excavation blade 2 and the stirring blade 3 of the excavation shaft 1 and between the upper and lower stirring blades 30. The soil clods are mixed and stirred by the stirring blades 3.

Therefore, a predetermined filler material is supplied at low pressure from a fluid passage (not shown) provided in the excavation shaft 1, and ground improvement is performed while mixing and stirring the cut soil mass and the filler material.

Further, according to the present invention, even if the button is pressed for excavation in a boundary area where the difference in excavation resistance of the ground is significantly large, for example, the boundary between the improved ground 12 and the unimproved ground 11, the center of the excavation shaft 1 will resist the excavation resistance. It is possible to proceed straight (in the direction B) without eccentricity (in the direction of entry) into unimproved ground with a small surface area (Fig. 5).

This is because the cylindrical body 5 and the resistance plate 8 strongly resist eccentricity of the excavation shaft 1.

As explained in detail above, the mixing agitation blade device according to the present invention has a simple structure, and also improves the efficiency of stirring with the filler material by forcibly stopping the cut soil mass that coexists with the excavation blade during soil cutting. This is a device that prevents eccentricity of the excavation shaft due to differences in excavation resistance.

Therefore, according to the present invention, it is possible to improve the ground with the most effective and high strength for sandy soil and gravelly soil.

Even for ground improvement in broken clay layers, there is no need to repeat the work of digging and pulling out the excavation shaft as in conventional methods, and sufficient mixing and agitation is achieved as the cut soil blocks do not clump together. Therefore, effective ground improvement can be achieved by mixing and stirring once during excavation or extraction.

In addition, the amount of luminescent material used can be limited to the optimum amount without waste, and stirring efficiency can be improved.
Even in a boundary area where the difference in grinding resistance is extremely large, ground improvement can be carried out accurately as designed in one excavation, resulting in significant effects such as greatly improving the efficiency of ground improvement work.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a conventional embodiment during excavation, Fig. 2 is a longitudinal cross-sectional view of an embodiment of the present invention during excavation, and Fig. 3 shows the anti-seismic device shown in Fig. 2. FIG. 4 is a sectional view taken along the line A--A in FIG. 2, and FIG. 5 is a longitudinal sectional view of another embodiment of the present invention during excavation. 1...Drilling shaft, 2...Drilling wing, 3...
... Stirring blade, 4 ... Both anti-warping device, 5
...Cylindrical body, 6...Arm, 7...
...Boss, 8...Resistance plate, 9...Both warp prevention blades.

Claims (1)

[Claims] 1. In a ground improvement machine that mixes and stirs soil and filler by rotating and pulling out a excavation shaft equipped with a excavation blade and a stirring blade using a predetermined excavation mechanism, the excavation shaft is positioned above the excavation blade. 1 consisting of a cylindrical body with approximately the same diameter as the excavation diameter.
The anti-warp device is rotatably inserted into the excavation shaft via a boss and an arm, and the above-mentioned anti-warp device has a resistance plate protruding from the excavation diameter on the outer periphery, and a resistance plate extending near the excavation shaft on the inner periphery. A mixing and stirring blade device for cutting soil, characterized in that a set of anti-seizure blades is fixed thereto.