JP3230199B2 - Stirring device in ground improvement equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer in a ground improvement apparatus such as a soft ground improvement machine for mixing a hardening agent such as ready-mixed concrete or slurry cement into soft ground such as a landfill. And related technologies.

[0002]

2. Description of the Related Art A soft ground improvement machine of this kind is equipped with a stirrer for mixing a soil hardening agent into soft ground while stirring it at the front of a self-propelled lower body having a float with a crawler belt. An upper vehicle body is installed on a vehicle body, and a driver's cab, a prime mover, and the like are mounted on the upper vehicle body (see Japanese Utility Model Publication No. 5-12348).

Conventionally, the agitating device has a plurality of agitating blades directly attached to a drive shaft or a double-shaft structure, in which agitating blades are attached to each shaft, and each shaft is separately driven. Then, there is a type in which each agitating blade rotates in the reverse direction when each shaft is rotated in the reverse direction. Further, another blade is fitted to the drive shaft adjacent to the drive blade rotating integrally with the drive shaft, and the diameter of the drive blade is larger than the rotation diameter of the drive blade rotating integrally with the drive shaft. There is what was formed in.

In this apparatus, a blade fitted to a drive shaft is locked at an unimproved portion to become a fixed blade, and a stirring function is provided by a change in a relative position between the drive blade and the fixed blade. It is.

[0005]

However, such conventional stirring devices have the following problems. That is, in the case where a plurality of stirring blades are directly attached to the drive shaft, since the whole rotates in a fixed shape,
The viscous soil or the like hardens the periphery of the stirring blade into a dumpling shape, making stirring and mixing impossible.

In the case where the shaft has a double structure,
The whole device becomes large, for example, the shaft diameter becomes large. Furthermore, in the case where the stirring function is performed by changing the relative position between the driving blade and the fixed blade, since there are only two blades, the number of cuts of the ground by the blades is small and high stirring mixing property cannot be expected much.

[0007] In view of the above, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to improve the stirring and mixing performance and to reduce the size of the stirring device in the ground improvement device.

[0008]

According to a first aspect of the present invention, there is provided a ground improvement apparatus for mixing a soil treating agent into a ground while stirring the soil treatment agent. A plurality of rotary stirring blades respectively fixed at a plurality of axially spaced positions on the outer peripheral portion of the shaft and rotating integrally with the drive shaft, wherein adjacent rotary stirring blades are provided so as to be out of phase with each other; Blades, the outer peripheral portion between the adjacent rotary stirring blades of the rotary drive shaft, a hollow pipe having a substantially oval cross section that is rotatably fitted and movably inserted in only one direction orthogonal to the rotary drive shaft, Outer than the circular locus of the tip of the rotary stirring blade when fixed to the hollow pipe and the hollow pipe moves in only one direction orthogonal to the rotary drive shaft and becomes a center axis position shifted from the rotary drive shaft. The tip is located at Configured to include a stop blade, a.

In the invention according to a second aspect, the rotary stirring blade is formed of a plate member whose plate surface extends substantially in a plane perpendicular to the rotary drive shaft.

[0010]

According to the first aspect of the present invention, when the stirring device is pushed into the ground and the rotary drive shaft is rotated, the rotary stirring blade fixed to the rotary drive shaft rotates while the stop blade is fixed. The hollow pipe moves in one direction perpendicular to the drive shaft due to the action of the centrifugal force and moves to the center axis position shifted from the rotary drive shaft, so that it moves similarly.

[0011] For this reason, the tip of the stop blade is located outside the circular locus of the tip of the rotary stirring blade, and the tip of the stop blade is fixed and stopped at the unstirred soil portion in the ground. As described above, when the stop blade is stopped with respect to the rotation of the rotary drive shaft, the relative position between the stop blade and the rotary stirring blade changes, so that a relative stirring function is achieved, and the stirring and mixing effect is improved. It is possible to prevent the surroundings of the stirring blade from hardening into a dumpling with viscous soil or the like, so that stirring and mixing can be continuously performed.

In particular, since a plurality of rotary stirring blades are provided, and the adjacent rotary stirring blades rotate in a phase shifted from each other, the number of ground cuts by the blades is large, and high stirring and mixing properties can be expected. Furthermore, since the drive shaft can be constituted by a single shaft, the structure can be simplified and the device can be downsized.

According to the second aspect of the present invention, the rotary stirring blade is less likely to receive the soil resistance as a reaction force, and the rotary stirring blade is reliably rotated in the ground.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a stirrer in a ground improvement device such as a soft ground improvement machine for mixing a hardening agent such as ready-mixed concrete or slurry cement into soft ground such as a landfill. Example) is shown.

That is, in the figure, a stirring device 1 includes a rotary drive shaft 2 driven by a driving device such as a motor (not shown), a first rotary stirring blade 3, a second rotary stirring blade 4, and a hollow It is composed of a pipe 5 and a stop blade 6. The first rotary stirring blades 3 are provided in a pair, fixed at two opposing positions at the tip of the rotary drive shaft 2, and rotate integrally with the rotary drive shaft 2.

Each of the first rotary stirring blades 3 is composed of a plate member extending in a plane perpendicular to the axis of the rotary drive shaft 2.
The second rotary stirring blade 4 is provided in a pair, and is fixed at two opposite positions of the base end of the rotary drive shaft 2 so as to have a phase different from that of the first rotary stirring blade 3, respectively. 2 and rotate together.

The second rotary stirring blades 4 are each formed of a plate member extending in a plane perpendicular to the axis of the rotary drive shaft 2.
The hollow pipe 5 is formed to have a substantially elliptical cross section, and is rotatable and rotatable on the outer peripheral portion between the first rotary stirring blade 3 and the second rotary stirring blade 4 of the rotary drive shaft 2. It is inserted so as to be movable only in one direction orthogonal to.

The stop blades 6 are provided in a pair, and are fixed to two opposite positions on the outer peripheral surface of the hollow pipe 5 respectively. When the hollow pipe 5 moves in only one direction orthogonal to the rotary drive shaft 2 and reaches a center axis position shifted from the rotary drive shaft 2, the stop blades 6 The tip is formed outside the circular locus 7 (see FIG. 2), and in the present embodiment, is constituted by a plate member extending in a plane perpendicular to the axis of the rotary drive shaft 2.

Next, the operation of the stirring device 1 will be described. The stirrer 1 is pushed into the ground, and the rotary drive shaft 2
Is rotated, the first rotary stirring blade 3 at the tip of the rotary drive shaft 2 and the second rotary stirring blade 4 at the base end rotate, while the stop blade 6 is connected to the hollow pipe 5 to which this is fixed. It moves by the action of centrifugal force in one direction orthogonal to the rotary drive shaft 2 and becomes a center axis position shifted from the rotary drive shaft 2, so that it moves similarly. That is, the state of FIG. 2A changes from the state of FIG.

For this reason, the tip of the stop blade 6 is located outside the circular locus 7 (see FIG. 2) of the tip of the rotary stirring blades 3 and 4, and the tip of the stop blade 6 is connected to the rotary stirring blade 3 in the ground. , 4 is fixed and stopped at the soil portion 8 (see FIG. 2) which is not stirred. As described above, the stop blade 6 is stopped with respect to the rotation of the rotary drive shaft 2, so that the relative position between the stop blade 6 and the first rotary stirring blade 3 and the second rotary stirring blade 4 is set. Due to the change, the relative stirring function is exhibited, and the stirring and mixing can be performed effectively, and the surroundings of the stirring blades can be prevented from hardening into a dumpling shape by viscous soil or the like, so that the stirring and mixing can be continuously performed.

In particular, the first rotary stirring blade 3 and the second rotary stirring blade 4 are provided.
In addition, since the second rotary stirring blade 4 rotates in a shifted phase, the number of cuts of the ground by the blade is large, and high stirring and mixing properties can be expected. Furthermore, since the rotary drive shaft 2 can be configured as a single shaft, the structure can be simplified and the size of the device can be reduced.

In the above embodiment, the first rotary stirring blade 3 and the second rotary stirring blade 4 are formed of a plate member whose plate surface extends substantially in a plane perpendicular to the rotary drive shaft 2. Therefore, the rotary stirring blades 3 and 4 are less likely to receive soil resistance as a reaction force and rotate reliably in the ground. In the above embodiment, two rotary stirring blades 3 and 4 are provided, and the stop blade 6 is positioned between the two.
However, the present invention is not limited to this, and a plurality of (three or more) rotary stirring blades may be provided, and the stop blades may be located between the adjacent rotary stirring blades. Mixability can be expected.

[0023]

As described above, according to the first aspect of the present invention, the stop blades are rotated in the unstirred soil portion of the ground with respect to the rotation with the rotary stirring blade fixed to the rotary drive shaft. As a result of being fixed and stopped, stirring and mixing can be performed effectively, and the surroundings of the stirring blades can be prevented from hardening into a dumpling shape with viscous soil or the like, so that stirring and mixing can be performed continuously and the ground by the blades Since the number of cuts is large, high mixing and mixing properties can be expected, and the drive shaft can be constituted by a single shaft, the structure can be simplified and the device can be downsized.

According to the second aspect of the present invention, the rotary stirring blade is less likely to receive soil resistance as a reaction force, and rotates reliably in the ground, so that stirring and mixing is reliably performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the invention described in claims 1 and 2;

FIG. 2 is a cross-sectional view of a stop blade portion, where (A) is a normal position of the stop blade and (B) is a movement position of the stop blade.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 stirrer 2 rotary drive shaft 3 first rotary stirring blade 4 first rotary stirring blade 5 hollow pipe 6 stop blade

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-26032 (JP, A) JP-A-5-179639 (JP, A) JP-A-4-38320 (JP, A) 121034 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 3/12 102

Claims (2)

(57) [Claims] An agitating device for mixing a soil treatment agent into a ground while stirring the soil treating agent, wherein the agitating device is fixed to a rotary drive shaft and at a plurality of axially spaced positions on an outer peripheral portion of the rotary drive shaft. A plurality of rotary stirring blades rotating integrally with the drive shaft, wherein adjacent rotary stirring blades are provided so as to be out of phase with each other; and between the rotary stirring blades adjacent to the rotary drive shaft. On the outer periphery,
A hollow pipe having a substantially oval cross section, which is rotatably fitted and movably inserted in only one direction perpendicular to the rotary drive shaft, and one direction perpendicular to the rotary drive shaft, the hollow pipe being fixed to the hollow pipe; And a stop blade whose tip is located outside the circular locus of the tip of the rotary stirring blade when it is moved only to the center axis position displaced from the rotary drive shaft. Stirrer in the ground improvement equipment that does 2. A stirrer according to claim 1, wherein said rotary stirring blade is formed of a plate member whose plate surface extends substantially in a plane orthogonal to a rotary drive shaft.