JP4863725B2 - Column row kneader - Google Patents

Description

  The present invention relates to a columnar kneading apparatus.

An auger kneading apparatus has been developed and put into practical use in which a plurality of auger kneading shafts are arranged in parallel with each other and a column row kneading wall is formed in a state where a plurality of cylinders are stacked in the ground.
In these devices, a part of the spiral blades of each auger kneading shaft overlapped in a plane, and while stirring the ground with these spiral blades, cement milk etc. was discharged from the vicinity of the tip and improved into the ground It is an apparatus for continuously forming a cylindrical body by overlapping a part thereof.
However, the conventional columnar kneading apparatus has the following problems.
<1> A structure in which one continuous column row kneading wall is formed in a state where a part of a cylinder and a part of an adjacent cylinder overlap each other in the ground. Accordingly, in a plan view, a circle and a part of the circle overlap each other, and a rectangular columnar kneading wall cannot be formed in a plan view.
<2> When a core material such as H steel is pushed into the column row kneading wall in which a part of the cylinder is overlapped in this way, the core material must be inserted into the center of the cylinder, and the pitch of the core material Is limited by the pitch of the cylinder. That is, the pitch of the core cannot be determined ignoring the pitch of the cylinder.
<3> If the pitch of the core material can be freely selected, the size and pitch of the core material can be selected by strength calculation. However, as described above, the core material has a restriction that must be inserted into the center of the cylinder, so that an economical design choice cannot be made.
<4> When construction of the next unit is completed after one day of construction, construction must be started with the last cylinder constructed last time and a new cylinder overlaid, that is, completely wrapped. I must. From the standpoint of strength, there should be no problem if the previous unit and the newly constructed unit overlap partly from the standpoint of water stoppage. Can not take.
<5> As an improvement, as shown in FIG. 9, the kneading blade a is surrounded by a rectangular casing b, and the portion of the earth and sand left by the blade c is cut with the lower edge of the casing b as the blade c. Devices designed to cut are also being developed. (Example: JP-A-6-146267)
<6> However, when a column wall is actually constructed in the ground using an apparatus as shown in FIG. 9 and one surface thereof is cut out, there is a gap between the rotation trajectory of the kneading blade a and the casing b. It was found that a triangular pillar of earth and sand remains as the unreserved portion d. This is apparent from the fact that the unexcavated portion d is not colored like the other kneaded portions and remains in the ground as earth and sand as a triangular prism.
<7> The reason is that the earth and sand are only kneaded by the kneading blades a, and the portion does not become a space, so the earth and sand of the unexcavated portion d only remains in the ground as a triangular prism and does not move. It is.

JP-A-6-173264

In order to solve the above problems, an apparatus as shown in FIG. 11 has been developed.
This apparatus is an apparatus for attaching an upper inclined piece 43 and a lower inclined piece 44 to the mounting plate 40 and trying to remove earth and sand with the inclined piece.
The upper inclined piece 43 of this apparatus is inclined in a direction away from the mounting plate 40 as it goes downward, and the lower inclined piece 44 is a plate inclined in a direction that approaches the mounting plate 40 as it goes downward.
However, the apparatus as shown in FIG. 11 has the following problems.
<1> A device that breaks out the protruding soil in the circumferential direction. Since earth and sand are continuously present in the circumferential direction, it is difficult to smoothly move the earth and sand that is going to break.
<2> In order to collapse the earth and sand to both sides, it is necessary to provide inclined plates on both sides of the mounting plate. Therefore, the resistance during the original excavation may increase before the breaking action.
<3> The surface of the underground groove that has been broken by the inclined piece remains turbulent, and a smooth surface cannot be formed. If the wall surface is not smooth, the resistance when the apparatus is pulled up increases, and wasteful energy is consumed for the operation of the machine.

The columnar kneading apparatus of the present invention that has solved the conventional problems as described above includes a columnar kneading wall in which a plurality of auger kneading shafts are arranged in parallel to each other and a plurality of cylinders are stacked in the ground. In the auger kneading apparatus, the auger kneading shaft is composed of a central rotating shaft and a spiral blade attached to a part of the rotating shaft, and a plurality of adjacent rotating shafts are held by a common connecting device. The connecting device is constituted by a guide tube fitted to the outer periphery of the rotating shaft and a connecting plate for connecting the guide tubes, and in a state of protruding from the connecting device, the position of one rotating shaft is adjacent to the rotating shaft. A downward cutting blade is attached via a mounting plate between the rotating shaft and the position of this cutting blade is located between the cylinder formed by one spiral blade and the adjacent spiral blade. inclined plate configured like being positioned on the cutting edge , Tubular elements toward the wall surface of the kneading wall is protruded inclined downward by the inclined plate, wherein the configuration was tubular elements kneading apparatus to push the kneading range of sediment and to guide the inner helical blade he removed It is what.

Further, the cutting tool of the present invention, a plurality of auger kneading shafts are arranged in parallel vertically, the auger kneading shaft is composed of a central rotating shaft and a spiral blade attached to a part of the rotating shaft, a plurality of rotary shaft adjacent to a cutting tool attached to the auger kneader gripped by a connecting device in common, and a mounting plate for attaching to the coupling devices, a cutting blade disposed in the mounting plate, on the cutting edge more configuration and inclined plate positioned, the cutting edge is a plate body formed with a sharp tip, the inclined plate, the mounting plate side is a plate inclined at a descending slope towards the side of the cutting edge, the inclination The present invention is characterized by a cutting tool configured such that the earth and sand cut by the cutting blade are guided to the inside by the plate and pushed out into the kneading range of the spiral blade .

Since the columnar kneading apparatus of the present invention is as described above, the following effects can be obtained.
<1> A kneading zone having a rectangular planar shape can be formed in the ground using an auger kneading apparatus that forms a column kneading wall in a state where a plurality of cylinders are stacked.
<2> Since the kneading area can be formed in a rectangular shape in a planar manner, the installation position of the core material is not restricted by the position of the cylinder. As a result, the position where the core material is inserted can be freely selected, and it is not necessary to dispose an unnecessarily large amount of the core material, which enables an economical arrangement.
<3> Since the insertion position of the core material is limited to the position of the cylinder and is not restricted, accuracy is not required for the insertion of the core material, and the construction efficiency can be improved.
<4> Since a rectangular kneading zone can be formed on a plane, construction such as completely wrapping the last cylinder of the previous construction part and the new cylinder of the new construction part becomes unnecessary. . As a result, the new kneading zone can be arranged in consideration of strength, water stoppage, and workability, and the lapping cost can be reduced.
<5> As a result of reducing the lapping cost, the amount of cement used can be reduced, and the amount of excavated sludge that is industrial waste can also be reduced.
<6> In order to form a kneading zone having a rectangular planar shape, no special device is required, the excavating blade is simply attached to the connecting device of the auger kneading shaft, and the bolt hole of the connecting device is used as it is. It is also very economical.
<7> Compared with an apparatus as shown in FIG. 11, the direction of breaking the earth and sand is toward the central direction, so there is less resistance and it can be smoothly collapsed and cut off.
<8> Furthermore, since a symmetrical arrangement is not required as compared with the apparatus of FIG. 11, there is less resistance during excavation, and smooth excavation is possible.
<9> The kneading apparatus of the present invention has a tendency that the inclined plate 33 presses the kneaded product against the wall surface when it is pulled up, the finish of the wall surface becomes smooth, the quality is improved, and the pulling resistance is reduced. Therefore, compared with the conventional apparatus as shown in FIG. 11, no wasteful energy is required when the kneading apparatus is pulled up.

  Embodiments of the columnar kneading apparatus of the present invention will be described below with reference to the drawings.

<1> Precondition.
The column row kneading apparatus of the present invention is a column in which a plurality of auger kneading shafts 1 having a prime mover 42 attached to the upper end thereof are arranged in parallel vertically by a high leader 41 and a plurality of cylinders are stacked in the ground. A part of an auger kneading apparatus for forming a row kneading wall is improved.
The auger kneading shaft 1 of such an auger kneading apparatus is composed of a central rotating shaft 11 and a spiral blade 12 attached to a part of the rotating shaft 11.

<2> Connecting device 2.
A plurality of adjacent rotating shafts 11 are held by a common connecting device 2.
The connecting device 2 includes a guide tube 21 and a connecting plate 22 that connects between the guide tubes 21.
The guide cylinder 21 is fitted to the outer periphery of the rotating shaft 11 and holds the rotating shaft 11 in a state where the rotating shaft 11 can freely rotate.
Since the guide cylinder 21 is a member for restricting the direction of entry so that the rotary shaft 11 enters the ground vertically, it is preferable to attach the guide cylinder 21 as close to the lower end of the rotary shaft 11 as possible.
Actually, in order for the rotating shaft 11 to enter the ground, it is necessary to provide the spiral blade 12 at the tip thereof, and therefore the connecting device 2 is positioned at a position immediately above the spiral blade 12.

<3> Cutting tool 3.
A cutting tool 3 is attached to the connecting device 2 that holds the plurality of adjacent rotating shafts 11.
The cutting tool 3 includes an attachment plate 31 attached to the coupling device 2, a cutting blade 32 disposed in parallel with the attachment plate, and an inclined plate that connects between the attachment plate and the cutting blade 32.
The cutting blade 32 is a plate having a tip formed at an acute angle.
On the other hand, the inclined plate 33 is a plate that is inclined downwardly from the mounting plate side toward the cutting blade 32 side, that is, the excavation surface of the columnar kneading wall.

<4> Installation position of the cutting tool 3.
The cutting tool 3 is attached in a state of protruding from the connecting plate 22 of the connecting device 2.
In that case, it attaches so that the cutting blade 32 may be located between the position of one rotating shaft 11 and the position of the adjacent rotating shaft 11.
The cutting blade 32 is attached downward via the inclined plate 33, and the position of the cutting blade 32 is located on a line connecting the outermost edges of the plurality of spiral blades 12.
As a result, the cutting blade 32 is attached so that the position of the cutting blade 32 is between the cylinder formed by one spiral blade 12 and the adjacent spiral blade 12 and at a position not kneaded by the spiral blade 12 on both sides. It will be.

<5> Kneading with a spiral blade.
Next, the operation of the above apparatus will be described.
Similar to this type of conventional apparatus, a high leader 11 supports a plurality of kneading shafts 1 having a prime mover 12 attached to the upper end.
When the rotary shaft 11 of the kneading shaft 1 is rotated, the spiral blade 12 attached around the rotary shaft 11 enters the ground.
The plurality of rotating shafts 11 and the spiral blades 12 penetrate in parallel, and the ground is stirred into a plurality of cylindrical shapes partially overlapping in plan view.
After stirring to a certain depth, the rotary shaft 11 is pulled up while rotating while discharging cement milk from the vicinity of the tip of the rotary shaft 11.
In this way, a plurality of kneaded continuous columnar kneading walls are formed in the ground.

<6> Cutting and finishing with a cutting tool.
As described above, since the connecting device 2 is located near the tip of the rotating shaft 11, the connecting device 2 also enters the ground when the rotating shaft 11 enters the ground.
Then, the cutting blade 32 attached to the coupling device 2 also enters the ground, and the cutting blade 32 scrapes off a part of the ground.
As described above, the mounting position of the cutting blade 32 is located on the line connecting the outermost edges of the plurality of spiral blades 12.
Therefore, the unmixed triangular prism portion between the cylinders formed by one spiral blade 12 and the adjacent spiral blade 12 is cut and extruded to the kneaded portion.
In particular, the inclined plate 33 located on the cutting blade 32 protrudes in a state inclined downward toward the wall surface of the columnar kneading wall.
Therefore, the earth and sand are pushed inward by the lower surface of the inclined plate 33, that is, pushed toward the spiral blade 12, and are sufficiently kneaded by the spiral blade 12.
Thus, the inclined plate 3 fulfills the function of cutting the earth and sand and guiding it to the inside when the apparatus is lowered.
On the other hand, when the apparatus is pulled up, the inclined plate 3 functions to press the earth and sand against the wall surface of the groove.
If the inclined plate 3 presses the kneaded material against the wall surface, the wall surface is finished like a “glazed finish”, so that the quality of the wall surface is improved.
Furthermore, a smooth flat surface is formed by the inclined plate 3, and the pulling resistance of the apparatus can be reduced.

<7> Formation of a rectangular kneading range.
Through the above steps, a rectangular kneading range can be formed using a device in which circular spiral blades are stacked in plan view.
In that case, as shown in FIG. 10, when the rectangular casing provided around the spiral blade is inserted, apart from the kneading by the spiral blade, the casing plate independently penetrates into the ground. In reality, a triangular prism that is not kneaded remains as it is between the blade and the casing plate.
However, in the apparatus of the present invention, the cutting tool 3 is provided with the inclined plate 33 inclined downward toward the wall surface of the kneading wall, and the inclined plate 33 guides the earth and sand to push out into the kneading range of the spiral blade. Perform the action.
Therefore, the triangular column which is not kneaded like the conventional apparatus does not remain in the ground, and a completely kneaded rectangular area can be formed. (Fig. 7)
As a result, even if the interval between the rotating shafts 11 is 450 mm, for example, the interval between the cores such as H steel can be set as 500 mm, and is not restricted by the interval between the rotating shafts 11 as in the prior art.

Explanatory drawing of the Example of the construction apparatus of a column wall. Explanatory drawing of a kneading shaft and a connection apparatus. The side view of the state which attached the cutting tool to the connection apparatus. The side view of the Example of a cutting tool. The perspective view of the Example of a cutting tool. Explanatory drawing of the state which is extruding earth and sand with a cutting tool inside. Explanatory drawing of the column row kneading | mixing column comprised with the apparatus of this invention. Explanatory drawing of the column row kneading | mixing pillar comprised with the conventional apparatus. The side view of an example of the conventional kneading apparatus. Explanatory drawing of the undigging part at the time of kneading | mixing with the conventional apparatus. Explanatory drawing of the principal part of the other conventional apparatus.

Explanation of symbols

1: Kneading shaft
11: Rotating shaft
12: Spiral feather
2: Connecting device
21: Guide tube
22: Connecting plate
3: Cutting tool
32: Cutting blade
33: Inclined plate

Claims (2)

In an auger kneading apparatus that forms a column row kneading wall in which a plurality of auger kneading shafts are arranged in parallel vertically and a plurality of cylinders are stacked in the ground,
The auger kneading shaft is composed of a central rotating shaft and a spiral blade attached to a part of the rotating shaft,
Grip a plurality of adjacent rotating shafts with a common coupling device,
This connecting device is constituted by a guide tube that fits on the outer periphery of the rotating shaft, and a connecting plate that connects between the guide tubes,
In a state of projecting from this connecting device, a downward cutting blade is attached via a mounting plate between the position of one rotary shaft and the position of the adjacent rotary shaft,
The position of this cutting blade is configured so as to be located between the cylinder formed by one spiral blade and the adjacent spiral blade,
The inclined plate located on the cutting blade
Inclining downward and projecting toward the wall surface of the column row kneading wall,
By this inclined plate, it was configured to guide the shredded earth and sand and push it out to the kneading range of the spiral blade,
Column row kneading equipment. A plurality of auger kneading shafts are arranged in parallel vertically,
The auger kneading shaft is composed of a central rotating shaft and a spiral blade attached to a part of the rotating shaft,
A cutting tool for attaching a plurality of adjacent rotating shafts to an auger kneading apparatus gripped by a common connecting device,
A mounting plate to be attached to the coupling device;
A cutting blade arranged on the mounting plate ;
It consists of an inclined plate located on the cutting blade,
The cutting blade is a plate body with a sharp tip at the tip,
The inclined plate is a plate inclined at a downward slope from the mounting plate side toward the cutting blade side,
With this inclined plate, the earth and sand cut by the cutting blade was guided inward and pushed out into the kneading range of the spiral blade.
Cutting tool.

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