JP3287989B2 - Ground stirring and mixing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for agitating and mixing a ground used, for example, to form a columnar pile by mixing an improving material and an in situ soil or to improve the strength of the ground.

[0002]

2. Description of the Related Art As a soft ground improvement method, various improving materials and soft clay soil are mixed and stirred in situ in the ground, and a strong bonding between the improving material and the viscous soil is performed by utilizing a chemical bonding action. There is a method of creating a simple columnar pile, stabilizing the soil properties, and improving the ground strength. As the equipment used,
A stirring and mixing processing apparatus including a stirring shaft rotated by a drive system, a supply pipe disposed along the inside of the stirring shaft, and a stirring blade or the like rotatably attached to the stirring shaft is used. I have. Then, the improving material is conveyed at a predetermined pressure via a supply pipe, and is discharged from a root portion of the stirring blade or the like to a gap formed by rotation of the stirring blade. The discharged improving material is scattered on the rotation locus as the stirring blade rotates, and is forcibly mixed with the in-situ soil.

[0003] Such an apparatus structure is described in Japanese Patent Application Laid-Open No. 58-54121 and shown in FIG.
The stirrer shaft a has a multi-shaft configuration, and the stirrer blades d are provided in multiple stages in the vertical direction of the stirrer shaft a. In addition, in terms of construction quality, in addition to careful selection of the improving material, a plurality of agitating blades d are projected on the outer periphery of the agitating shaft a with a predetermined inclination in order to increase the stirring or mixing ratio of the improving material and the in-situ soil. In the vicinity of the stirring blade d, a co-rotation preventing means c (this symbol c also serves as a swing stop between the stirring shafts d) is provided to prevent the co-rotation of the soil in the mixing process.

Further, the stirring blade structure has been devised such that the lower side of the rectangle is tapered as in the stirring blade d of FIG. As another stirring blade structure, a unit stirring blade e twisted in a substantially U-shape as shown in FIG. Example provided in a skirt shape in the direction.
As shown in FIG. 9B, a pair of horizontal stirring blades f projecting outward from the shaft diameter so as to vertically cross the stirring shaft a as shown in FIG. And a pair of semicircular vertical stirring blades g provided so as to draw a circle.

[0005]

However, none of the above stirring blades has been sufficiently satisfactory in terms of mixing action. This is considered for the following reasons. First, in the stirring blade structure of FIG. 8, although the mixing object is likely to be disturbed by tapering the lower side, if the blade width is small, it is difficult to uniformly mix the mixing objects positioned above and below. In addition, the mixing efficiency tends to cause a problem, and conversely, as the blade width increases, the stirring shaft a
A large resistance is added to the drive system for rotating the agitating blade d, and among the mixing objects pushed by the rotation of the stirring blade d, it is difficult to cause disturbance particularly in the mixing object portion hitting the blade middle horizontal portion,
In an extreme case, there is a possibility that the mixing object may simply rotate.

In the stirring blade structure shown in FIG. 9 (a), the lower horizontal blade portion and the obliquely upwardly inclined blade portion constituting the stirring blade e cause turbulence when the object to be mixed has a low viscosity such as a liquid. Although it is easy to cause the mixture to have a viscosity similar to that of ordinary soft ground, it is unlikely to cause turbulence due to the formation of a lump of the mixture target corresponding to the U-shaped space. In addition, the workability is poor due to the configuration of forming a curved shape by twisting, and it is necessary to increase the mixing efficiency of the blades or to increase the thickness of the steel plate as a material to about 80 mm, for example, in order to secure the durability of the stirring blades. There's a problem. Further, in the stirring blade structure of FIG. 9B as well, the presence of the semicircular vertical stirring blade g together with the horizontal stirring blade f tends to cause disturbance when the mixing target has a low viscosity such as a liquid. When the semi-circular vertical stirring blades g act on the mixing object located, the mass of the mixing object corresponding to the inner / outer space portion of the semi-arc tends to be generated, and the higher the viscosity, the higher the viscosity between the upper and lower layers. Disturbance is less likely to occur. Further, similarly to the above structure, the semi-circular vertical stirring blade g has a configuration in which it is curved, so that the workability is poor, and there is a problem when it is desired to increase the thickness of a steel plate as a material.

In view of the above background, the present inventor has previously invented Japanese Patent Application No. 7-257278.
The present invention is a further improvement of this, and the object is to assume a simple structure, to have low power even when the wing width is large, and to be structurally excellent in fabrication or workability, and It is an object of the present invention to provide a ground stirring and mixing processing apparatus which enables more uniform mixing. Other objects will be clarified in the following description.

[0008]

According to a first aspect of the present invention, there is provided a stirring shaft operated by a drive system, and a stirring shaft which is provided so as to be integrally rotatable with the stirring shaft. Providing a stirring blade projecting in the direction and a supply pipe having a discharge port toward a portion of the stirring blade to be stirred, in a process of penetrating or pulling out into soft ground while rotating the stirring shaft,
In the ground stirring / mixing processing apparatus for mixing the improved material discharged from the discharge port and the in-situ soil by the stirring blade, the stirring shaft has a two-axis configuration, and the stirring blade has a substantially parallel upper surface. It has a horizontal wing portion and a lower horizontal wing portion, and a vertical wing portion integrally connecting a portion located on the stirring shaft side by a predetermined dimension from each protruding end of the upper and lower horizontal wing portions. Along with each of the protruding end sides of the upper and lower horizontal blade portions is formed an inclined surface, and a stirring blade formed such that the inclined surface gradually increases downward from above is provided on one of the stirring shafts. Using, a stirring blade formed so that the inclined surface gradually reduces the amount of protrusion from top to bottom, using the other of the stirring shaft, in a state where each stirring blade is mounted at the same height on each stirring shaft. , The stirring blades form an overhang on the inclined surface An opening window for dispensing defined by the stirring shaft, the upper and lower horizontal blade portions, and the vertical blade portion, a projecting end side of the upper and lower horizontal blade portion, and the vertical blade. And an outer opening defined by the portion. Further, according to a second configuration of the present invention, in the apparatus having the above prerequisites as described in claim 2, the stirring shaft is provided with 2
On the other hand, the stirring blade has a substantially parallel upper horizontal blade portion.
Minute and lower horizontal wings, and the projections of these upper and lower horizontal wings
Connect the part located on the stirring shaft side by a predetermined dimension from the end
With the vertical wing part
Each protruding end of the upper and lower horizontal wings is formed on an inclined surface.
In addition, the inclined surface gradually increases the amount of protrusion from the top to the bottom.
Using a stirring blade formed to increase the one of the stirring shaft,
So that the slope gradually reduces the amount of protrusion from top to bottom
Using the formed stirring blade for the other of the stirring shafts,
A state where the stirring blades are mounted at the same height on each of the stirring shafts
The stirring blades form an overhang on the inclined surface.
And the stirring shaft and the upper and lower horizontal blade portions
And an opening window for dispensing defined by the vertical wing portion and
Defined by the projecting end of the serial on-lower horizontal wing portions and said Tatetsubasa portion
Formed on the rotation trajectory of the stirring blade through a mounting member that is rotatable with respect to the stirring shaft and that is not rotated when the stirring shaft is pulled out of the ground. The main part is that it has stationary blades that are not rotated by the rotation of the stirring shaft and are shorter than the horizontal dimension inside the opening window.

In the present invention, in the case of forming the substantially U-shaped member in the first configuration, the position of the vertical wing portion is shifted to form the kneading opening window and the outer opening, and In the second configuration, since the stationary blade is simply provided at a predetermined position together with the stirring blade having the opening window, both can be easily and easily adopted. In the mixing action, in the first configuration, the soil corresponding to the upper and lower horizontal wing portions is rotated in the vertical direction in the process of rotating the stirring blade due to the presence of the opening window for kneading and the outer opening portion. As a result, the turbulence having a width up and down occurs, and soil corresponding to the vertical wing portion is moved into and out of the opening window and the outer opening. At the same time, the opening window and the soil moved into the outer opening are mixed while being kneaded, and in the kneading process, a specific disturbance is generated in the target soil, thereby enabling uniform mixing. Second
In the configuration, in addition to the operation of the first configuration, the kneaded soil is further divided by the stationary blades that are stationary in the rotation locus of the stirring blade, so that more uniform mixing or stirring can be performed. I do.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 are views showing a first embodiment of the present invention. In FIG. 1, this stirring and mixing apparatus is an example of a two-shaft configuration, in which a stirring shaft 1 rotated by a drive motor, a supply pipe 2 arranged along the stirring shaft 1, and both stirring shafts 1. , The stirring blades 6, 7, 8, which are integrally rotatable with the stirring shaft 1, and the upper stirring blade 6.
And a pair of a stationary blade 9 provided in relation to the above and an excavating blade 1a provided at the lower end of the stirring shaft 1. In addition, the supply pipe 2 is disposed inside the stirring shaft 1, but may be provided along the outside of the stirring shaft 1. 2 to 5, the supply pipe 2 is omitted.

(Co-rotation preventing means structure) Each of the co-rotation preventing means 3, 4 and 5 is the same in that the stirring shafts 1 on both sides are connected to each other and also serves as a shake stopper for the stirring shafts 1. Among them, the co-rotation preventing means 3 at the upper stage further has an action of stopping the stationary blade 9 so as not to rotate by the rotation of the stirring shaft 1 (this is referred to as a reaction force utilizing structure). It is different from the rotation preventing means 4 and 5. In addition, the lower co-rotation prevention means 5
Is different from the others in that it is located between the stirring blades 7 and 8 provided as a unit (set) and also has an action similar to that of the stationary blade 9. These matters are described in detail after the detailed description of the mounting structure of each of the co-rotation prevention means 3, 4, 5 is made.
Will be revealed at

As shown in FIG. 2, the upper counter-rotating prevention means 3 mounts a bearing 11 on a cylindrical body 10 arranged on the outer periphery of each stirring shaft 1, and connects the two bearings 11 with a connection / prevention plate. It is a structure connected by 12. The cylindrical body 10 has an inner diameter slightly larger than the outer diameter of the stirring shaft 1, is arranged to penetrate through the stirring shaft 1, and is stirred by upper and lower stopper members 13 provided in the axial direction of the stirring shaft 1. The shaft 1 is rotatably mounted at a fixed height position. During this assembly,
A short cylindrical bearing 14 for the stirring blade 6 described below is provided on the outer periphery of the cylindrical body 10. Further, a pair of locking pieces 15a and 15b are provided by welding or the like on each of the cylindrical bodies 10 on the outer periphery where the co-rotation preventing means 3 is arranged so as to be located in the same line shape. Each bearing 11 is composed of a half body 11a with a clamping piece on both sides. The cylindrical body 10 is wrapped by a pair of halves 11a, and a locking piece 15a and a locking piece 15a are provided between the opposing clamping pieces. With the locking pieces 15b positioned, the locking pieces 15a, 1
5b. Before and after this joining operation, the prevention plate 12 is disposed between the inner holding pieces (holding pieces that hold the locking pieces 15b) of the half bodies 11a located on the left and right sides, and both ends are bolted. Stopping member 1 such as nut
At 6b, the respective bearings 11 are connected to each other by being connected thereto.

As shown in FIG. 4, the counter-rotating means 4 in the middle stage is different from the one in the upper stage in that the cylindrical body 10 does not exist. A bearing 17 is provided for each agitating shaft 1, and both of them are provided. This is a structure in which the bearings 17 are connected by a connection / prevention plate 18. Each bearing 17 is a half body 17a with a clamping piece on both sides.
The stirring shaft 1 is wrapped by a pair of halves 17a, and the opposing holding pieces on both sides are connected to each other by a stop member 16c such as a bolt and a nut. Be attached. The vertical movement of each bearing 17 is restricted to a predetermined range by upper and lower stopper members 13a provided in the axial direction of the stirring shaft 1. Before and after this assembling, the prevention plate 18 is disposed between the inner holding pieces of the half bodies 17a located on the left and right sides, and both sides thereof are connected to the corresponding bearings 17 by stopper members 16d such as bolts and nuts. And connected.

The lower counter-rotating means 5 has a structure in which bearings 19 are provided for the stirring shafts 1 as shown in FIG. 5, and the bearings 19 are connected by a connecting / preventing plate 20. Each bearing 19 is composed of a half 19a with a clamping piece on both sides, and the stirring shaft 1 is wrapped in a pair of half 19a,
The opposing holding pieces on both sides are connected to each other by a stop member 16e such as a bolt and a nut, and are rotatably mounted on the stirring shaft 1. The bearings 19 are assembled so that the vertical movement in the axial direction is restricted by upper and lower stopper members 13b provided in the axial direction of the stirring shaft 1.
Before and after this assembling, the prevention plate 20 is arranged between the inner holding pieces of the half body 19a located on the left and right sides, and both sides thereof are connected to the corresponding bearings 19 by the fixing members 16f such as bolts and nuts. Connected. In addition, the co-rotation prevention means 5 is provided between the stirring blades 7 and 8 provided as a unit (set) for the upper and middle stages,
Also, the vertical width of the prevention plate 20 is formed to be smaller than the prevention plates 12 and 18 and about 100 mm.

(Structure of stirring blade and stationary blade) Each of the stirring blades 6, 7,
8 is the same in that it is rotated in conjunction with the rotation of the stirring shaft 1. The upper stirring blade 6 includes an upper horizontal blade portion 21, a lower horizontal blade portion 22, and a vertical blade portion 23 connecting the portions of the upper and lower horizontal blade portions 21 and 22 located on the protruding end sides. To form a kneading opening window 24 on the stirring shaft 1 side and an outer opening 25, and the stationary blade 9 provided so as to be positioned within the rotation locus of the opening window 24. It is characterized by having. In addition, it is assumed that the stirring blades 7 and 8 are arranged in a substantially same plane with respect to the conventional structure as shown in FIG.
The difference is that the vertical width of each of the stirring blades 7 and 8 is relatively wide at 50 mm or more, and the distance between the two blades is narrow at 300 mm or less to form the kneading opening 26. Next, these will be described in more detail.

The upper-stage stirring blade 6 is composed of two left and right stirring blades on both stirring shafts 1 and is arranged on the stirring shaft 1 with a predetermined inclination. Each of the agitating blades 6 includes an upper horizontal blade portion 21 and a lower horizontal blade portion 22 which are disposed substantially in parallel with each substantially U-shaped side portion, and upper and lower horizontal blade portions 21 and 21.
2 is integrally provided with a vertical wing portion 23 connected to the stirring shaft 1 by a predetermined dimension on each protruding end side.
Is fixed to the short cylindrical bearing 14 by welding or the like, and the shaft end of the lower horizontal wing portion 22 is fixed to the stirring shaft 1 by welding or the like, so that it can rotate integrally with the stirring shaft 1. Is provided. In the attached state, a substantially rectangular kneading opening window 24 penetrating in the front-rear direction is located on the upper side.
The lower horizontal blade portions 21 and 22, the vertical blade portion 23, and the stirring shaft 1 are defined, and an outer opening 25 is arranged in parallel with the opening window 24 with the vertical blade portion 23 interposed therebetween.

The stirring blades 6 provided on both stirring shafts 1 have the same configuration, but differ in the shape of the portion forming the outer opening 24. That is, the stirring blade 6A of the left stirring shaft 1 in FIG. 1 has an inclined surface 6a in which each protruding end side of the upper and lower horizontal blade portions 21 and 22 gradually increases from the top to the bottom.
While the stirring blade 6B of the right stirring shaft 1
Is formed on an inclined surface 6b in which the protruding end sides of the upper and lower lateral wing portions 21 and 22 gradually reduce the protruding amount downward from above. This is because the stirring blades 6 are located between the stirring shafts 1 and are installed at the same height.
6b, an overhang portion with a small gap is formed so that the portion can be approached as much as possible, so that an unmixed portion is not generated. This structure is the same in the case of the stirring blades 7 and 8 described later. Further, according to this configuration, when the stirring shaft 1 is configured as a multi-axis, each stirring blade is provided at the same height, and in a mode in which the trajectory of each blade is tangent, conventionally, each stirring shaft is interlocked. Although the rotation was controlled as described above, since the stirring blades of each axis do not overlap due to the presence of the overhang part by forming the above-mentioned overhang part, it is also possible to rotate and drive each axis without interlocking Becomes The above-mentioned stirring blade 6 has a total length of about 1000 to 1 with two blades.
A steel plate having a thickness of about 500 mm and a thickness of about 50 to 60 mm is used.
Of the lower horizontal wing portion 22 is about 80
~ 150mm, the vertical spacing of the opening window 24 is about 150 ~ 25
0 mm, and the radial width of the outer opening 25 is designed to be 50 mm or more. Here, in particular, the value of the vertical distance between the opening window 24 and the outer opening 25 slightly differs depending on the set value of the vertical width of the stirring blade 6, and the like, but the upper and lower horizontal blade portions 21 and
It is more preferable from the standpoint of mixing performance that it is set to about 0.5 to 1.5 times the sum of the upper and lower blade widths of No. 2.

The stationary blade 9 is provided with a set of holding fittings 27 and one blade plate 28, the entire length of which is set shorter than the horizontal dimension inside the opening window 24, and is rotatably provided on both stirring shafts 1. Protruding through the cylindrical body 10 provided, the stirring shaft 1 does not rotate even if it rotates. The wing plate 28 is designed so that the upper and lower wing widths are about 50 mm, and protrude from the outer periphery of the cylindrical body 10 to about 300 mm in the axial direction. As shown in FIG. 3, the mounting structure of the stationary blade 9 is such that two holding fittings 27 are fixed on the outer periphery of the tubular body 10 by means of welding or the like up and down. A wing plate 28 is supported therebetween. In this case, the blades 28 have different strengths (for example, are composed of bolts and nuts having different rigidities).
The front and rear portions at a predetermined distance from the base side of the wing plate 28 are fixed by using the stopper members 29 and 30. That is, the rear end side near the tubular body 10 is the front stop member 30.
A stop member 29 having a greater strength than that is used.
This is because, when an external force larger than the design value is applied to the wing plate 28, the stop member 3 is turned off as shown by the imaginary line in FIG.
0 is crushed and the wing plate 28 is rotated about the stopper member 29 as a fulcrum without detaching from the cylindrical body 10 (when a strong lump or the like enters the opening window 24 at the time of construction). It was adopted as a result of ingenuity.

Note that such a structure may be a method other than using the stopping members 29 and 30 having different strengths as in the above-described embodiment. As an example, a bearing as shown in FIG. 5 is provided on the outer periphery of the cylindrical body 10, a member corresponding to the holding metal 27 is omitted from the bearing, and a blade corresponding to the blade 28 is directly connected to the bearing. The structure is fixed. In this case, a structure in which the bearing is fixed to the outer periphery of the cylindrical body 10 by frictional force by tightening both sides of the bearing half,
A structure in which the bearing is locked so as not to come off on both sides of the bearing half, and a rotation preventing pin or the like is locked to the tubular body 10 from the outer periphery of the bearing is conceivable. In other words,
In the former, when an external force greater than a design value is applied to the blade and the force becomes equal to or more than the frictional force of the bearing, the bearing loses the frictional force and slips to rotate. The latter is configured such that when an external force larger than a design value is applied to the blade, the rotation preventing pin is crushed and rotated by losing the external force. Note that two or more stationary blades 9 may be provided per axis.

The lower stirring blades 7 and 8 are paired (unit).
, And are provided as a pair on the left and right sides of both stirring shafts 1. Further, when being fixed to the stirring shaft 1 so as to be integrally rotatable by welding or the like, the following two conditions are satisfied. As a premise, the upper and lower stirring blades 7 and 8 each have a vertical width of at least 70 mm or more as in the conventional steel plate type, and preferably 1 mm or less.
It is designed to be at least 00 mm.

The first condition is that the stirring blades 7 and 8 are arranged in substantially the same plane. The second condition is that the distance between the stirring blades 7 and 8 is set to 300 mm or less,
A kneading opening 26 defined by the stirring shaft 1 and the stirring blades 7 and 8 in the attached state is formed. The first and second conditions are as follows. The kneading opening 26 particularly determines the interval between the stirring blades 7 and 8, that is, the size of the opening 26 affects the stirring or mixing performance by kneading. Based on the findings of the test. The stirring blades 7 and 8 are attached at a predetermined inclination angle to the stirring shaft 1 similarly to the stirring blade 25, but the inclination angle is arbitrary as in the case of the stirring blade 25 and is not inclined. May be perpendicular to the axis of the stirring shaft 1.

The stirring blades 7 and 8 are both configured as a set (unit) for forming the kneading opening 26, and in this embodiment, the co-rotation preventing means 5 is provided.
Is provided at a substantially intermediate position of the opening 26 and projects from the shaft side in the rotation locus of the stirring blades 7, 8 or the opening 26, and the soil kneaded out of the opening 26 removes the rotation locus. The prevention plate 20 which is stationary inside,
It is further divided. Therefore, the prevention plate 2
Reference numeral 0 designates the width of the upper and lower plates (about 100 mm) and the like so that the same action as that of the stationary blade 9 can be exhibited.

Here, in the embodiment of FIG. 1, each of the stirring blades 7, 8
Is formed of a steel plate having a thickness of about 50 mm, and the total of the vertical width of the stirring blade 7 and the vertical width of the stirring blade 8 is about 140 to 240.
mm. However, the upper and lower width of the lower stirring blade 8 is such that the resistance at the time of penetration is likely to be large here,
In addition, there is a case where a nozzle (not shown) for discharging the improving material sent from the supply pipe 2 is provided, and a plurality of excavating blades are provided diagonally downward, so that the width is somewhat wider.
The stirring blades 7 and 8 provided on both stirring shafts 1 have the same configuration, but the shapes of the free ends of the stirring blades 7 and 8 are different. That is, the stirring blade 7A of the left stirring shaft 1 in FIG.
8A is formed on the inclined surfaces 7a, 8a whose projecting ends gradually increase in amount from top to bottom, whereas the stirring blades 7B, 8B on the right side of FIG. 1 each projecting ends gradually project from top to bottom. It is formed on the inclined surfaces 7b and 8b for reducing the amount. This configuration is provided between the stirring shafts 1 and is provided with each stirring blade 7.
When the (stirring blades 8) are installed at the same height, each stirring blade 7
(Stirring blades 8) are inclined surfaces 7a, 7b (inclined surfaces 8a, 8b).
This is because the overhang portion is formed in b) so that the portion can be approached as much as possible so that an unmixed portion is not generated. This point is the same as the relationship with the upper-stage stirring blades 6A and 6B.

(Second and Third Embodiments of the Present Invention) FIG.
5 to the stirring / mixing processing apparatus shown in FIG. 5, the stirring blades having substantially the same form as the upper-stage stirring blades 6 instead of the stirring blades 7 and 8 used as a unit or a set in the other example of the reaction force utilization structure described above. This is an example using 60. FIG. 7 shows the stirring shaft 1.
Is an example of a one-axis configuration. In the description of the embodiments of FIGS. 6 and 7, only the main parts that are different from the above-described FIGS. 1 to 5 will be described, and the same parts or members will be denoted by the same reference numerals and redundant description will be omitted.

(Another Example of Reaction Force Utilization Structure) In the structure of FIG. 6, the co-rotation prevention means 3 in the upper part of FIG. 1 is changed.
That is, the co-rotation prevention means 40 in the upper stage is constituted by two prevention plates 42 for both the stirring shafts 1 (note that the prevention plates 42 are
The stirrer shaft 1 may be provided independently of each other with a step. Each of the prevention plates 42 is protruded by using a bearing 41 with respect to a cylindrical body 10 (the cylindrical body 10 is formed longer than that of FIG. 1) disposed on the outer periphery of each stirring shaft 1. ing. The left bearing 41 supporting the prevention plate 42 includes the stopper member 13c and the short cylindrical bearing 1
4, the movement in the axial direction is restricted, and the right bearing 41
The axial movement between the stopper member 13 and the stopper member 13d is restricted. Further, the length of each prevention plate 42 is longer than the stirring blades 6 and the stirring blades 60,
As shown in FIG. 6, the protruding end side of the prevention plate 42 is slightly bitten into the side surface of the ground during the process of being penetrated into or pulled out of the ground. Therefore, at the time of construction, for example, when the rotating stirring shaft 1 is pulled out of the ground, the respective prevention plates 42 are stopped by receiving the reaction force on the ground side, and as a result, the cylindrical body 10 is Not rotated with Accordingly, the stationary blade 9 does not rotate due to the rotation of the stirring shaft 1 and can reliably perform the operation of further dividing the soil that enters the opening window 24 or the soil that is kneaded from the opening window 24. As another reaction force utilization structure, although not shown, an eccentric shaft portion is provided on a part of the rotating shaft 1 as described in Japanese Patent Application Laid-Open No. HEI 5-179639. It is also possible to provide a member such as a rotatable prevention plate 42. Furthermore,
Depending on construction conditions and the like, the tubular body 10 is extended to the ground surface side, and by holding the upper end side of the tubular body, even when the rotating shaft 1 rotates, the tubular body and the stationary blade 9 do not rotate. Such a configuration may be adopted.

(Example of Combined Structure of Stirring Impellers) In the structure of FIG. 6, instead of the stirring blades 7 and 8 of FIG. 1, stirring similar in shape to the upper stage stirring blade 6 (left and right stirring blades 6A and 6B). Wing 60
(Left and right stirring blades 60A, 60B) are used. The stirring blade 60 differs from the stirring blade 6 in FIG. 1 in the following point. First, the upper horizontal blade portion 21 and the lower horizontal blade portion 22 which are arranged substantially in parallel are fixed to the stirring shaft 1 by welding or the like at their axial ends, so that they can rotate integrally with the stirring shaft 1. Is provided. Secondly, the vertical wing portion 23 connects the more axial side portions from the protruding ends of the upper and lower horizontal wing portions 21 and 22, and the outer opening 25a is formed larger than that of FIG. 24a is somewhat smaller in proportion thereto. Thus, the stirring blades 6 and 60 are provided with the opening windows 2.
4, 24a and the size of the openings 25, 25a can be arbitrarily designed, and even when the stationary blade 9 is not particularly provided, the mixing or stirring performance can be improved by the kneading action.

The stirring blades 6 and 60 or the stirring blades 7 and 8 in the unit of FIG. 1 are optimally combined according to the construction conditions and ground conditions, that is, which part in the axial direction of the stirring shaft 1 It is needless to say that a blade having a wing structure is applied or, in that case, the employment of the stationary blade 9 is also considered and selected arbitrarily. In this case, the stirring shaft 1 may be provided with only one stage or three or more stages.

Further, in the above-described stirring and mixing apparatus, the case where the stirring shaft 1 has a two-shaft configuration has been described.
A single stirring shaft 1 may be used as in the above example. The agitating shaft 1 in the figure is different from the one-side structure in FIG. 1 in the following point. First, the upper co-rotation prevention means 40
(Consisting of the cylindrical body 10, the bearing 41, the prevention plate 42, and the like) has substantially the same structure as that of FIG. Secondly, the middle rotation prevention means 43 and the lower rotation prevention means 44
Are the corresponding bearings 4 rotatably provided on the stirring shaft 1
Preventing plates 47 and 48 having substantially the same length or projecting dimensions as the stirring blades 6 and the stirring blades 7 and 8 are used for the stirring blades 5 and 46. The structure of each of the co-rotation preventing means 43 and 44 is also provided with an eccentric shaft portion on a part of the rotating shaft 1 as described in Japanese Patent Application Laid-Open No. Hei 5-179639 and, for example, It is also possible to provide members such as 6 rotatable prevention plates 47 and 48.

Hereinafter, the outline of the construction using the above-described stirring and mixing apparatus and the operation of each of the stirring blades will be further described with reference to the example of FIG. Although the drawing shows an example of a one-axis configuration, the same applies to the two-axis configuration shown in FIGS. First, at the time of construction, after the stirring and mixing device 1 is moved and positioned by a crane or the like, the stirring operation is performed while the stirring shaft 1 is rotated. The stirring shaft 1 is rotated by a driving device 50 connected to the upper end portion as in the related art, and penetrated to a predetermined depth. Then, in general, the operation proceeds to the stirring and mixing operation in the penetration process. In this case, the stirring shaft 1 is used.
Is connected to a nozzle (not shown) provided on the stirring blade 8 or the like, and the improving material is stirred from the nozzle by the stirring blades 7 and 8 at a predetermined flow rate and pressure. Is discharged into the soil in situ. The discharged improving material is scattered on the rotation locus as the stirring blades 7 and 8 rotate,
It is forcibly mixed with the in-situ soil. In addition, the stirring and mixing operation is usually performed also in the process of extracting the stirring shaft 1 after penetrating the stirring shaft 1 to a predetermined depth. In such a stirring and mixing process, the co-rotation preventing means 40, 43, 44
After being penetrated into the soil, it is not rotated by the rotation of the stirring shaft 1 as a result of the resistance of the soil or the like. Similarly, the stationary blade 9 is stationary without rotating via the cylindrical body 10 supporting the co-rotation preventing means 40.

Next, in the stirring blade 6 according to the present invention, the upper and lower horizontal blade portions 21 and 22 swing while the stirring shaft 1 is rotated due to the presence of the opening window 24 and the opening 25 for kneading. The soil is rotated while moving up and down, causing a turbulence with a width up and down. In addition, disturbance when soil rocked by the vertical wing portion 23 moves to the inside of the opening window 24 and the opening 25 also acts. At the same time, the soil moved inside the opening window 24 and the opening 25 also disturbs when being kneaded therefrom. In particular, since the kneading action is performed while the respective stirring blades 6 are usually moved in the vertical direction with the rotation, a peculiar disturbance occurs in the target soil even in the kneading process. In addition, the ground to be milled is disturbed while being further divided by the stationary blades 9, allowing more efficient and uniform mixing. Moreover, in the stirring blade 6 of the present invention, the opening window 24 and the opening 25 are formed by the upper and lower horizontal blade portions 21 and 22 and the vertical blade portion 23, and the vertical width of the blade is structurally wide. So
The relative movement between the upper and lower soils is promoted, and the stirring and mixing of the soil and the improving material can be greatly promoted. Further, even when the stirring shaft 1 is rotated at a high speed, the stirring blade 6 is not closed by the opening window 24 or the opening 2.
Since it is formed with five, the width of the upper and lower wings can be secured widely, but the resistance is small, and it can be operated with low power.

In the stirring blades 7 and 8 configured as a unit, the soil moved by the upper and lower stirring blades 7 and 8 in the process of rotating the stirring shaft 1 due to the presence of each kneading opening 26. Is rotated while being moved in the up-down direction, causing a turbulence having a width in the up-down direction. Further, turbulence causing the soil to move to the inside of the opening 26 and peculiar turbulence caused by kneading from the soil are added. In addition to this, the ground or the like to be kneaded is disturbed while being further divided, similar to the stationary blade 9 described above, due to the presence of the intervening prevention plate 48, thereby enabling more efficient and uniform mixing. Also, similarly to the stirring blade 6, when the stirring shaft 1 is rotated at a high speed, the opening 26 is formed between the blades, so that the upper and lower blade widths can be secured wide, but the resistance is small and the operation is performed with low power. it can.

In the present invention, the stirring shaft 1, the driving device 50 and the like constituting the stirring and mixing processing apparatus are not limited to the present embodiment, but may of course have other structures.

[0033]

As described above, the following effects can be obtained by the ground stirring and mixing apparatus according to the present invention. The configuration of the stirring blade is a comparatively simple form, and is excellent in workability even when the blade vertical width is increased, and is easily adopted. That is, in the structure of this is because it is sufficient form the opening window and the outer opening for out dough. In terms of mixing action, due to the presence of the respective opening windows and the outer openings, the soil corresponding to the upper and lower horizontal wing portions is rotated while being moved in the vertical direction, and turbulence having a vertical width is generated. , soil opening window corresponding to Tatetsubasa portion, a disturbance to further move to the inside of the outer openings, the kneaded out opening window, further the disturbance when out kneading the outer opening, according to claim 2, further stator blades In addition to the action of mixing while dividing the soil or the like from which it is kneaded, more uniform mixing or stirring is achieved. As a unit agitating blade, the vertical width of the blade can be set to be large structurally. In this case as well, each kneading opening window and the outside opening can be installed with a small rotating power without receiving much resistance during rotation. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing the front and side surfaces of a main part of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1 and a side view of the stationary blade.

FIG. 4 is a sectional view taken along the line CC of FIG. 1;

FIG. 5 is a sectional view taken along line DD of FIG. 1;

FIG. 6 is a schematic view showing the front and side surfaces of a main part of the apparatus according to the second embodiment of the present invention.

FIG. 7 is a schematic view showing a main part of an apparatus according to a third embodiment of the present invention.

FIG. 8 is a diagram for explaining a main part of a conventional device.

FIG. 9 is a diagram showing another two examples of the conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stirring shaft 2 Supply pipe 6, 60 Stirrer blade 9 Stationary blade 10 Cylindrical body (attachment member) 21 Upper horizontal blade part 22 Lower horizontal blade part 23 Vertical blade part 24, 24a Opening window for dispensing 25, 25a Outside opening 27 Holding bracket (mounting member)

Continuation of the front page (56) References JP-A-7-173828 (JP, A) JP-A-8-13470 (JP, A) JP-A-62-164910 (JP, A) JP-A-61-97433 (JP) , U) Utility model registration 3005597 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 3/12 102

Claims (2)

(57) [Claims] 1. A stirring shaft operated by a drive system, a stirring blade provided to be rotatable integrally with the stirring shaft and protruding outward in a radial direction of the stirring shaft, and directed to a portion of the stirring blade to be stirred. A supply pipe having a discharge port, and in the process of penetrating or pulling out into the soft ground while rotating the stirring shaft, the agitating blade mixes the improved material discharged from the discharge port with the in-situ soil by the stirring blades The agitating shaft has a two-axis configuration, while the agitating blades have substantially parallel upper and lower horizontal wing portions, and respective protruding ends of the upper and lower horizontal wing portions. In addition to integrally having a vertical wing portion connecting a portion located on the stirring shaft side by a predetermined dimension, each protruding end side of the upper and lower horizontal wing portions is formed on an inclined surface. Also, the inclined surface may gradually increase the amount of protrusion from the top to the bottom. Using the formed stirring blade in one of the stirring shaft, the stirring blades which the inclined surface is formed so as to reduce gradually protruding amount downward from the top with the other of the stirring shaft, the respective stirring blades each In a state where the stirring blades are attached to the stirring shaft at the same height, the stirring blades form an overhang portion on the inclined surface and approach each other, and the stirring shaft, the upper / lower horizontal blade portion, and the vertical blade portion. The ground opening characterized by forming a dispensing opening window defined by: and an outer opening defined by the protruding end sides of the upper and lower horizontal wing portions and the vertical wing portion. Stir-mixing processing equipment. 2. A stirring shaft operated by a drive system, a stirring blade provided so as to be integrally rotatable with the stirring shaft and protruding radially outward of the stirring shaft, and directed to a portion of the stirring blade to be stirred. A supply pipe having a discharge port, and in the process of penetrating or pulling out into the soft ground while rotating the stirring shaft, the agitating blade mixes the improved material discharged from the discharge port with the in-situ soil by the stirring blades In the apparatus for stirring and mixing ground, the stirring shaft has a two-shaft configuration, and the stirring blades have substantially parallel upper and lower horizontal blade portions.
From the protruding ends of these upper and lower horizontal wings
A vertical wing portion connecting the portion located on the stirring shaft side and
And the upper and lower horizontal wing portions
Each protruding end side is formed on a slope, and the slope gradually increases the amount of protrusion from top to bottom.
Using the stirring blade formed as one of the stirring shaft,
Formed so that the slope gradually decreases from top to bottom
Each of the stirring blades is mounted at the same height on each of the stirring shafts, using the stirring blades provided for the other of the stirring shafts.
The stirring blades overhang on the inclined surface
Forming a stirrer, and the stirring shaft and the upper / lower side
Opening window for dispensing defined by a wing portion and the vertical wing portion
And the projecting end sides of the upper and lower horizontal wing portions and the vertical wing portion
Forming a picture made an outer opening, further, rotatably, and collision in a rotating locus of the agitating blades through the mounting member is not rotated, for example, when the stirring shaft is withdrawn from the ground with respect to the stirring axis A ground stirring / mixing processing apparatus provided with a stationary blade that is not rotated by the rotation of the stirring shaft and that is shorter than an inner horizontal dimension of the opening window;