JPH0115653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stirring device for improving the ground by mixing and stirring a hardened material with soil.

[Prior art and problems]

Conventionally, the following devices have been used to mix and stir soil, cement, lime, etc. using devices having stirring blades.

An auger-like or rake-like stirring blade is protruded around a vertical rotating shaft, and the rotating shaft is moved up and down while rotating horizontally.

A drilling shaft in which a screw part and a stirring blade part are arranged alternately vertically and a stirring shaft having stirring mixing blades are arranged alternately in a line, and the screw part is attached to the part of the stirring shaft where the stirring blade is not provided. In addition, the stirring blade section is placed opposite to the part of the stirring shaft where the stirring mixing blade is provided.

However, when such a device is used, the ground is improved in a circular or cylindrical shape, and since the circles are sequentially agitated so that they overlap when viewed from above, construction work is repeated, which is not favorable in terms of construction efficiency. Furthermore, when constructing an underground wall, etc., the side walls are wavy and the wall thickness is not constant, which is often undesirable.
Furthermore, there are cases where stirring is not performed reliably, and stirring and mixing are not performed uniformly.

In the case of this device, it is possible to prevent the side wall from waving to a certain extent, and the wall thickness can be made constant to a certain extent, but it cannot be said that prevention of wavyness and constant wall thickness have been sufficiently achieved. Further, since the screws and the stirring blades are arranged alternately above and below, stirring and mixing can be carried out to some extent, but it cannot be said to be sufficient because stirring is carried out only in one direction.

[Purpose of the invention]

This invention was devised in view of the above-mentioned circumstances, and its purpose is to improve the ground by making it possible to excavate an excavation hole with a constant wall thickness and a rectangular cross section, and to ensure uniform stirring and mixing. An object of the present invention is to provide a stirring device for

[Structure of the Invention] According to the present invention, the excavation shaft and the stirring shaft are arranged alternately in a row, and the excavation shaft is provided with a stirring blade that rotates in a horizontal plane, and the stirring shaft is provided with a stirring blade that rotates in a vertical plane. It is something that

〔Example〕

The present invention will be explained below with reference to illustrated embodiments.

The stirring device 1 has a pit 2 at the lower end,
A stirring blade part 3 consisting of a stirring blade 3a rotating on a horizontal plane is provided at the bottom, an excavation shaft 5 of a tube body in which an upper screw part 4 is provided, and a stirring blade part 6 rotating on a vertical plane is provided at the bottom. Three stirring shafts 7 of the tubular bodies are arranged in parallel in a row with the stirring shaft 7 at the center. The upper ends of the excavation shaft 5 and stirring shaft 7 are attached to a gear box 8, so that the driving force of the drive device 9 is transmitted to both the excavation shaft 5 and the stirring shaft 7 through the gear box 8. ing. (See Fig. 1) As shown in Fig. 2, the gearbox 8 has an excavation shaft 5 attached to both ends, which is capable of supplying soil hardening liquid, etc. from the upper end to the inside of the pipe, and is rotatable by a gear 10. A stirring shaft 7 through which a chain 11 for driving the stirring blade section 6 passes is fixed inside the tube.

The gear 10 of the excavation shaft 5 meshes with the gear 9b provided on the drive shaft 9a from the drive device 9, and transmits the driving force from the drive device 9 to the excavation shaft 5 to rotate it. Also, the chain 11 inside the stirring shaft 7
is wound around a sprocket 14 having a bevel gear 13 that meshes with a bevel gear 12 provided at the lower end of the drive shaft 9a, and transmits the driving force from the drive device 9 to the stirring blade section 6.

As shown in FIG. 3, the stirring blade portion 6 of the stirring shaft 7 is connected to a rotating shaft 15 that protrudes from the stirring shaft 7 in a direction perpendicular to the direction in which the excavating shaft 5 and the stirring shaft 7 are arranged side by side. A plurality of stirring blades 16 protruding from a shaft 15 are arranged vertically at predetermined intervals.

As shown in FIG. 2, the stirring blades 16 of the stirring blade section 6 pass through the stirring shaft 7, and are rotated by the driving force of the drive device 9 transmitted through the chain 11 wound around the rotating shaft 15. Further, the stirring blade 16 is provided at a position such that it can face a portion of the excavation shaft 5 where the stirring blade 3a and the screw portion 4 are not provided.

In excavation work using such a stirring device 1, first, the drive device 9 is activated to rotate the excavation shaft 5, and excavation is started by the bit 2 at the lower end. As the excavation progresses, the excavated earth and sand is stirred by the lowest stirring blade 16 provided on the stirring shaft 7 and raised upward to a certain extent. This excavated earth and sand raised upward to a certain extent is transported to the stirring blade part 3 of the excavation shaft 5.
While being stirred by the stirring blade part 6 of the stirring shaft 7, it is raised to the screw part 4 above by the stirring blade part 6, and further raised upward by the screw part 4 of the excavation shaft 5.

Next, when the excavation shaft 5 excavates to a predetermined depth, the entire stirring device 1 is pulled up at one end. Then, the soil hardening liquid is spouted from the lower end of the excavation shaft 5 and lowered while stirring and mixing, and when it reaches the deepest part, the stirring device 1 is moved up and down and the stirring device 1 is gradually pulled out while further stirring and mixing.

In this case, the excavated earth and sand are transferred upward together with the liquid by the stirring blade 16 at the bottom, and the excavated earth and the liquid are stirred by the stirring blade part 3 of the excavation shaft 5 and the stirring blade part 6 of the stirring shaft 7. are mixed, and the stirring blade part 3 and the stirring blade part 5
The excavated soil and liquid that have been stirred and mixed are further transferred upward by the next screw section 4.

In this way, an underground continuous wall, etc. is created, and the cross-sectional shape of the excavation by this stirring device 1 is as shown in FIG. The wall thickness remains constant.

5 to 10 show other embodiments of the stirring device 1. FIG.

In FIG. 5, the number of blades of the stirring blade portion 3 of the excavation shaft 5 located between the stirring blades 16, 16 of the stirring shaft 7 is increased. In this way, stirring and mixing can be performed more reliably.

In FIG. 6, the number of stirring shafts 7 is increased to two, and the stirring blades 16 of both stirring blade parts 6, 6 are alternately overlapped and rotated. In this way, the side walls can be formed more consistently, and stirring and mixing can be performed more reliably.

In FIGS. 7 and 8, the excavation shaft 5 is placed in the center, and stirring shafts 7 are arranged on both sides. In this way, the excavation cross section can be made into a rectangular shape as shown in FIG. In FIG. 7, only the screw part 4 is provided on the excavation shaft 5, and stirring is performed by the stirring blade part 6 of the agitation shaft 7, while in FIG. Only the stirring blade part 3 is used, and the stirring blade part 6 of the stirring shaft 7 is used to raise the stirring element upward.

FIG. 10 shows an example in which the number of excavation shafts 5 and stirring shafts 7 is increased, and in this way, a large excavation cross section can be created.

〔Effect of the invention〕

The present invention has the above configuration and has the following effects.

Since it has stirring blades that rotate on a horizontal plane and stirring blades that rotate on a vertical plane, it is possible to uniformly and reliably mix and stir the excavated earth and sand or the excavated earth and sand and the soil hardening liquid.

Since the stirring blade rotates in a vertical plane, the side wall after excavation can be made uniform without being wavy, and the thickness of the excavated wall can also be made constant.

Since the stirring blades are rotated by a chain drive wound around the rotating shaft, the structure of the stirring shaft can be made simple. Therefore, by increasing the number of stirring shafts and stirring blades, it is easy to increase the excavation cross section and improve the stirring ability.

[Brief explanation of drawings]

FIG. 1 is a front view showing the stirring device of the present invention, FIG. 2 is an enlarged sectional view showing the gearbox of FIG. 1, and FIG. 3 is an enlarged sectional view showing the stirring blade of FIG. 1.
FIG. 4 is a sectional view showing an excavated hole using the stirring device shown in FIG. 1, FIGS. 5 and 6 are front views showing another embodiment of the stirring device shown in FIG. 1, and FIGS. FIG. 9 is a sectional view showing an excavated hole by the agitating device shown in FIGS. 7 and 8, and FIG. 10 is a front view showing a different mounting position of the stirring blade in the agitating device shown in FIG. It is a front view showing a stirring device. DESCRIPTION OF SYMBOLS 1... Stirring device, 2... Bit, 3... Stirring blade part, 4... Screw part, 5... Excavation shaft, 6...
Stirring blade section, 7... Stirring shaft, 8... Gear box, 9... Drive device, 10... Gear, 9a... Drive shaft, 9b... Gear, 11... Chain, 12,
13...Bevel gear, 14...Sprocket, 15
... Rotating shaft, 16 ... Stirring blade, 17, 18 ... Bevel gear, 19 ... Bearing.

Claims (1)

[Scope of Claims] 1. An excavation shaft in which a screw part and a stirring blade part rotating on a horizontal plane are disposed in the upper and lower parts, and a rotating shaft in which a large number of stirring blades rotating in a vertical plane are protruded from above and below. Stirring shafts having stirring blades arranged at predetermined intervals at the bottom thereof are arranged alternately in a row, and the upper ends of the excavation shaft and the stirring shaft are provided with a drive for rotating the stirring blades of the excavation shaft and the stirring shaft. attached to a gear box having a device, the stirring blade of the stirring shaft is opposed to a portion of the excavation shaft where the screw and the stirring blade are not provided,
A stirring device for soil improvement, characterized in that the stirring blades are rotated by a chain wound around a sprocket of the gear box and a rotating shaft on which a large number of the stirring blades are protruded.