JP2000154530A - Mixing and stirring device for excavated earth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing and stirring device for excavated earth capable of mixing and stirring digged earth efficiently when the ground is excavated into a reverse conical shape and a shape whose lower part becomes thin and the excavated earth is mixed and stirred to improve the soft ground. SOLUTION: A plurality of outward blade bodies 11, 12, 13, 14 are provided on a longitudinal shaft 2 in such a way that they form a small diameter when going downward, and a frame body 51 which is continuous vertically on an outer side of tips 11b to 13b of the outward blade bodies 11 to 13 and forms a small diameter when going downward is provided. Inward blade bodies 58, 59 protruding in inward direction are provided in the frame body 51 in such a way that they are positioned among the outward blade bodies 11 to 13. The frame body 51 is constituted is such a manner that it moves vertically together with the longitudinal shaft 2, and furthermore, both of the longitudinal shaft 2 and the frame body 51 rotate independently around axial line G by a rotation and drive means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing and agitating apparatus for excavated soil, and more particularly, to one or a plurality of vertical axes (hereinafter also referred to as an excavating axis) of soft ground in civil engineering and construction (construction) foundation work. ) To excavate into a columnar shape and discharge a lime-based or cement-based slurry-type solidifying agent (hereinafter also simply referred to as solidifying agent) while mixing and stirring, and mix and stir the solidifying agent and excavated soil. The present invention relates to a mixing and stirring device for excavated soil used for improving the ground by consolidating the ground.

[0002]

2. Description of the Related Art Such ground improvement is usually performed in a columnar shape. The diameter and the depth are set according to the load supporting force. On the other hand, when the diameter of the improved body is increased, a large amount of the solidifying agent is required at a certain ratio, and the construction cost of the improved body is increased. However, even with such a large diameter, it is often not possible to obtain a load supporting force commensurate with an increase in cost. This is because the bearing capacity of this type of ground improvement body largely depends on the contact area with the soil in the ground, but the cylindrical area cannot efficiently increase the contact area.
That is, it is considered that, in the case of the ground improvement body, if the diameter of the ground improvement body is smaller in the downward direction, such as an inverted conical shape, it is easier to increase the contact area than the cylindrical shape.

On the other hand, even in such an improved column having an inverted conical shape, it is necessary to sufficiently mix and stir excavated soil in the process of forming the same as in the case of the column.
Therefore, in the formation of such an improved column having a tapered shape, similarly to the formation of the column-shaped improved column, co-rotating between the blades such as a drilling blade and a stirring blade provided on the vertical axis. It is necessary to mount a prevention wing rotatably on the vertical axis via a boss to prevent the excavated soil from rotating together.

That is, a plurality of wings projecting outward (hereinafter, also referred to as digging wings, stirring wings, or digging stirring wings depending on the action) are provided so as to perform digging or stirring on the vertical axis. It is possible to propose a mixing and stirring device in which the diameter of the excavating wing is relatively large above the vertical axis, and a counter-rotating wing having a diameter larger than the diameter is provided on each excavating wing. That is, in this mixing and stirring device, the excavation wing is provided so that the one whose diameter is located below the vertical axis is relatively small, and the diameter of each of the excavation wings is larger than the diameter of each of the excavation wings. And a co-rotation prevention blade that is rotatable around the axis of the vertical axis.

In the case of excavating the ground with this device and mixing and agitating, the excavation is performed in order from the lowest excavation wing, and the anti-corotating wing on each excavation wing has an excavation portion (excavation column). Digging into the outer periphery (unexcavated portion) of the pit and stopping in a plan view, co-rotation of the excavated soil is prevented. In this way, in this excavation process, since the co-rotation prevention blades bite into the periphery of the column and stop, the co-rotation of the excavated soil is prevented, and the mixing and agitation are smoothly performed.

[0006]

However, in order to smoothly perform mixing and agitation with such an apparatus, it is necessary not only to move the vertical axis downward but also move it upward while rotating the vertical axis. It is essential to repeat up and down movement while rotating the vertical axis. However, in the device for improving the ground to a tapered shape, in the step of raising the vertical axis, the tip of the co-rotation prevention wing separates from the unexcavated portion of the peripheral edge of the column, and the stop cannot be secured. Therefore, when moving upward while rotating the vertical axis, the co-rotation prevention wing also rotates with the excavated soil that is about to rotate around the vertical axis on the excavation wing, so that the co-rotation of the excavated soil This cannot be prevented, and there is a problem that sufficient mixing and stirring cannot be performed.

As described above, when the ground is improved to a tapered shape such as an inverted conical shape with an apparatus in which independent anti-corotating wings are rotatably mounted on the vertical axis, the vertical axis moves up and down. Since the co-rotation preventing action is not ensured when moving upward, it is not possible to efficiently mix and stir while repeatedly moving up and down.

The present invention has been devised in view of the above problems, and has as its object to improve the soft ground by excavating and mixing into a shape having a tapered lower portion such as an inverted cone shape. It is another object of the present invention to provide an apparatus for mixing and stirring excavated soil that can efficiently perform mixing and stirring of excavated soil.

[0009]

According to a first aspect of the present invention, there is provided a mixing and stirring apparatus for excavated soil, wherein a plurality of outward wings projecting (extending) outward are formed on a vertical axis. A plurality of outwardly extending wings are provided with a frame body that extends vertically outside the tip of the plurality of outwardly extending wings, and has a smaller diameter toward the downward direction. An inward wing body protruding inward so as to be located between the bodies is provided, the frame body is configured to move up and down together with the vertical axis, and both the vertical axis and the frame body are rotated by rotation driving means. It is characterized in that it is configured to rotate independently and independently around the axis of the vertical axis.

In the present invention, the outward wing body provided on the vertical axis (excavation axis) functions as an excavation blade and / or a stirring blade when the vertical axis rotates. Further, the frame and the inward wing provided on the frame serve as the excavating blade and / or the stirring blade when the frame rotates. The inward wings need not be provided between all the outward wings provided on the vertical axis (excavation axis), and may be provided above or below the upper and lower wings provided on the vertical axis. Further, the configuration in which the vertical axis and the frame body rotate separately and independently about the axis of the vertical axis means a configuration in which both rotate in opposite directions, a configuration in which they rotate in the same direction at different rotation speeds, and a configuration in which rotation is stopped ( Means). In addition, it is preferable that the projection direction (outward direction) of the outward wing body provided on the vertical axis is perpendicular to the vertical axis, but it is not necessary to be perpendicular, and it may be curved in an arc shape in plan view. Further, the projecting direction (inward direction) of the inward wing body provided on the frame is preferably provided perpendicular to the longitudinal axis, but may not be perpendicular, and may be curved in an arc when viewed in plan.

When the vertical axis is rotated while moving the vertical axis downward without rotating the frame body, the excavator is excavated by the outward wing body. The excavated soil is prevented from rotating together with the frame body and the inward wing body provided on the frame body. Since the frame is stopped even when the vertical axis is moved upward in the same rotation state, the excavated soil does not rotate together, and the excavated soil is smoothly mixed and stirred.
Conversely, when the vertical axis is not rotated and the frame body is rotated to move the vertical axis downward, the excavated soil is prevented from rotating together with the outward wing body provided on the vertical axis, and Regardless, the excavated soil is mixed and stirred smoothly. In this case, the frame acts as a digging wing. Note that the same effect is obtained by rotating both the vertical axis and the frame body in opposite directions. In the present invention, the number of the outward wings and the inward wings may be appropriately set within a range in which the co-rotation preventing action is secured according to the excavation diameter, the depth, and the soil quality.

[0012] In the above means, the frame may not rotate around the axis of the vertical axis as follows. In other words, the mixing and stirring apparatus for excavated soil according to claim 2 of the present invention is provided with a plurality of outward wings projecting outward on the vertical axis, and having a smaller diameter as going downward, the plurality of outward wings. An inward wing body that extends vertically outside the tip of the body and has a smaller diameter toward the bottom, and that projects inward so as to be located between the upper and lower outward wing bodies; Provided that the frame is configured to move up and down with the vertical axis, and that the frame is not rotated while the vertical axis is rotated by rotation driving means around the axis of the vertical axis. Features.

Further, in each of the above means, the outward wing body may not rotate around the axis of the vertical axis as described below, and the frame body may rotate around the coaxial line. That is,
The mixing and stirring apparatus for excavated soil according to claim 3 of the present invention is provided with a plurality of outward wings protruding outward on the vertical axis so as to have a smaller diameter as going downward, and At the outside of the tip, there is provided a frame body that extends vertically and has a smaller diameter as it goes downward, and the frame body has an inward wing body that projects inward so as to be located between the upper and lower outward wing bodies. The frame is configured to move up and down together with the vertical axis, and the frame is rotated by rotation driving means around the axis of the vertical axis, while the vertical axis is not rotated. Is what you do.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mixing and stirring apparatus for excavated soil according to the present invention will be described in detail with reference to FIGS. In the figure, reference numeral 1 denotes a mixing and stirring device of this embodiment. 2 is a vertical axis (excavation axis) having a substantially cylindrical shape (or a hollow columnar shape), and the upper end is provided so as to move up and down along a vertically arranged leader (not shown). It is connected to a rotating drive means (not shown), and is configured to be capable of normal and reverse rotation and stop. The vertical wing 2 has an outward wing body 1 having a smaller diameter and projecting outward from the upper part downward.
1, 12, 13, and 14 are provided at intervals of four above and below. On the other hand, the outward wing bodies 11, 12, 13, 14
Are configured to excavate and agitate. Each of the outboard wings 11, 12, 13, and 14 has uneven teeth 11a, 12 whose lower sides are uneven to improve excavation.
a, 13a and 14a.

Further, the outer wing bodies 11, 12, 13 are vertically connected at intervals to the outside of the left and right lateral tips 11b, 12b, 13b, and have a smaller diameter in a stepped (stepwise) shape as they go downward. Is provided. In the present example, the vertical portions 52, 53, 54 are provided on the left and right so as to form a small diameter from top to bottom, and the upper end portion 55 is reduced in diameter so as to extend inward toward the longitudinal axis 2. , Is connected and fixed to a cylindrical body 61 rotatably arranged so as to surround the vertical axis 2. The upper end (not shown) of the cylindrical body 61 is connected to the rotation drive means, and is configured to be able to rotate forward and backward around the axis G of the longitudinal axis 2 and to be stopped independently of the longitudinal axis 2.

The frame body 51 is reduced in diameter so that its lower end 56 extends inward toward the longitudinal axis 2, and is connected and fixed to a cylindrical body 65 rotatably disposed so as to surround the longitudinal axis 2. Have been. Although the frame body 51 can be rotated forward and backward about the axis G of the vertical axis 2, the circumferential groove 63 provided on the inner peripheral surface of the upper cylindrical body 61 is vertically moved so as to move up and down together with the vertical axis 2. The lower cylindrical body 65 is externally fitted to the ring portion 4 provided integrally with the shaft 2, and the lower end surface 13 c of the base portion of the outward wing bodies 13 and 14,
The vertical movement is restricted by 14c.

Further, the frame 51 has outward wings 11, 12,.
Inward wings 58 and 59 are provided between the upper and lower sides of the thirteen and extend toward the longitudinal axis 2. This inward wing body 58,5
9 has a predetermined width (height), and has inner end portions 58b,
59b is close to the outer peripheral surface of the vertical axis 2 at an interval.

Although the frame 51 moves up and down with the vertical movement of the vertical axis 2, it rotates or stops around the axis G of the vertical axis 2 irrespective of the rotation or stop of the vertical axis 2. Is configured. In the vicinity of the tip of the vertical axis 2,
A discharge port 3 for a slurry-like solidifying agent is provided, and a solidifying agent (not shown) is moved from its pressure source to the inside of the vertical axis 2 (hollow portion).
Through the excavated soil.

Next, the operation or effect of the mixing and stirring device 1 for excavated soil according to the present embodiment will be described. In the case where the ground is excavated and mixed and stirred by the apparatus 1 of the present example, the ground moves downward while rotating the vertical axis 2 to one side without rotating the frame body 51, for example. Then, the outermost wing body 14, which forms the lowest excavating action, enters the ground and excavation starts,
The lower end portion 56 of the non-rotating frame body 51 hits the outer edge of the excavated diameter of the outward wing body 14 at the same time as the advance, and enters the ground while digging in.

Then, the excavation proceeds, and the outward wings 13, 1
As the pieces 2 and 11 sequentially enter the ground, the vertical portions 54, 53 and 52 of the frame body 51 which do not rotate in accordance with the progress thereof.
Hits the outer edge of the excavation diameter and penetrates into the ground while digging in. While excavating in this manner, while the slurry-like solidifying agent is being injected from the outlet 3 of the solidifying agent at the tip of the vertical axis 2 and the vertical axis 2 is moved downward, the ground goes from bottom to top. It is excavated in the shape of a stepped inverted cone so as to sequentially increase in diameter with the diameter of the outward wing bodies 14, 13, 12, 11. The portion where the outboard wing body substantially excavates except the outermost wing body 14 at the lowermost portion is outside the position corresponding to the tip of the adjacent lower outboard wing body. Act as

In this excavation process, since the frame body 51 is stopped, the inward wing bodies 58 and 59 provided thereon are also stopped without rotating around the longitudinal axis 2, so that the outward wing body 1 is not rotated.
The rotation of the excavated soil that is made to rotate at 1, 12, 13, and 14 is stopped. Therefore, the excavated soil and the solidifying agent are smoothly mixed and stirred.

Then, excavation is performed to a predetermined depth, and the vertical axis 2 is rotated forward and backward and moved up. At this time, the outward wing bodies 11 to 1
The excavated soil that is made to rotate together at 4 is an inward wing 5
8, 59 and the upper end 55 and the lower end 56 of the frame 51 are always stopped from rotating, so that mixing and agitation of the excavated soil and the solidifying agent are smoothly performed. As described above, according to the apparatus 1 of the present embodiment, even when the vertical axis 2 is moved upward, the frame 5
Since 1 can be moved upward together with the vertical axis 2 and not rotated around the vertical axis 2, co-rotation of the excavated soil can be prevented, and therefore the excavated soil can be mixed and stirred smoothly with the solidifying agent. Thereby, a uniform improved body having an inverted truncated cone shape can be efficiently formed.

In the above embodiment, the vertical axis 2 is moved upward, and the frame 5
When 1 is located in the excavated soil inside the excavated diameter excavated by the outward wing body, the frame 51 may be reversed with respect to the longitudinal axis 2. In this way, more efficient mixing and stirring can be obtained. This is because the outer wings 11 to 14, the upper and lower ends 55 and 56 of the frame 51, and the inward wings 58 and 59 act to shear the earth mass. It is highly viscous and is effective for deep improvement with large diameter in the improvement of the ground including stones and rocks. Also, if possible due to the softness of the ground, the vertical axis 2 or the frame 5 may be appropriately rotated by, for example, reversing the rotation of the vertical axis 2 simultaneously with the downward or upward movement of the vertical axis 2.
1 may be reversed. However, in that case, the outer contour of the stepped inverted truncated cone-shaped improved body forms the frame 51 shape.

Next, an apparatus 21 of the embodiment shown in FIG. 5 will be described. This apparatus is different from the apparatus 1 of FIG. 1 only in that the outermost wing 14 at the lowermost end of the longitudinal axis 2 is removed. Then, since the excavating action is performed by the frame body 51, the same portions are given the same reference numerals,
The description is omitted. 1, the excavation is started by rotating the vertical axis 2 at the start of excavation to stop the frame 51, whereas in this example, the frame 51 is rotated without rotating the vertical axis 2 at the start of excavation. By rotating, the cylinder 61 is moved downward together with the longitudinal axis 2. By doing so, it is possible to excavate in the shape of an inverted truncated cone, and the excavated soil is directed to the outward wing bodies 11 to 11.
Since the co-rotation is prevented at 13, the mixing and stirring can be performed smoothly. In this case also, the outer contour of the inverted truncated cone-shaped improved body forms the shape of the frame 51. Note that 2 in the figure
Reference numeral 4 denotes a ring portion that restricts the downward movement of the lower end portion 56 of the frame body 51, and is provided around the vertical axis 2.

The device 31 of the embodiment shown in FIG. 6 will be further described. This device is provided with uneven teeth 54a, 54a, 53a on the outer sides of the vertical portions 54, 53, 52 of the frame 51 in the device 1 of FIG.
53a and 52a are different only in that the frame 51 is provided.
Since the excavation property is improved on the outside, the same reference numerals are given to the same portions, and the description thereof will be omitted.

In any of the above embodiments, the frame 51 may be configured so as not to rotate around the axis G of the vertical axis 2. In this case, it is not necessary to provide a rotation drive mechanism in the frame body 51, so that the structure is simplified. Conversely, the configuration may be such that the vertical axis 2 is not rotated, while only the frame 51 rotates around the axis G of the vertical axis 2. In this case, it is not necessary to provide a rotation drive mechanism on the vertical axis 2, so that the structure can be simplified. They are relatively suitable for small diameter and shallow improvements.

In the above-described embodiment, the frame body is formed so that its outer side (vertical portion) is stepwise reduced in diameter in a downward direction, but it may be formed into an inclined straight line. According to this configuration, it is easy to fit by the wedge action regardless of the obstacle. The number (vertical interval), length and shape of the outward wings, the width of the frame and the width in plan view, and the protruding length of the inward wings and the width in plan view are determined by the soil quality, excavation diameter or excavation What is necessary is just to set suitably according to depth.

In the above-described embodiment, the excavator in which the leader is erected vertically and excavated has been described. However, an appropriate excavator (vehicle) body may be used. Further, the diameter of the outward wing body forming the excavation wing may be set to be relatively large for the one located above, and the degree may be appropriately set. Furthermore, the width and thickness of the inward wing body of the frame may be set appropriately. However, making the plane width thinner as long as there is no problem in the strength makes it easier to insert (dig into) unexcavated soil.

Further, in the above-mentioned embodiment, the outward wing body is provided linearly in a plan view so as to extend to the left and right of the longitudinal axis 2; however, about three or more radial directions in a plan view, at equal angular intervals, or at unequal angular intervals. May be provided. Further, in the above-described embodiment, the case where both the outward wing body and the inward wing body are provided at the same height on the left and right with respect to the vertical axis is illustrated, but they may be provided at different heights, that is, in a single wing shape. . further,
In the above embodiment, the outward wing body was formed in a linear shape in plan view,
This may be in the form of an arc or a letter "". It is appropriate to provide the inward wing body so as to extend from the inside of the frame toward the vertical axis, but it is sufficient if the inward wing body is provided so as to prevent co-rotation or excavation and stirring. Note that, in the above-described embodiment, an example in which the present invention is embodied on one vertical axis is illustrated. However, in the present invention, in a mixing and stirring apparatus for excavated soil having a plurality of vertical axes 2, the present invention is embodied on each vertical axis. Can also.

[0030]

As is apparent from the above description, the mixing and stirring apparatus for excavated soil according to the present invention has the following effects. According to the first aspect of the present invention, since both the vertical axis and the frame body are separately and independently rotated around the axis of the vertical axis by the rotation drive means, even in the case of ground improvement of an inverted conical shape, By properly controlling the rotation of the excavator or stopping one of the rotations, not only when excavating the vertical axis but also when moving the vertical axis upward, the excavated soil is smoothly mixed without rotating together. Can be stirred.

According to the second or third aspect of the present invention, in the improvement of the inverted conical ground, one of the longitudinal axis and the frame does not rotate, so that the structure of the apparatus can be simplified and the vertical structure can be improved. Not only when excavating the shaft down, but also when moving up the vertical axis, the mixing and agitation of the excavated soil can be achieved without rotating the excavated soil.

[Brief description of the drawings]

FIG. 1 is an explanatory front view showing a schematic configuration of an embodiment of a mixing and stirring apparatus for excavated soil according to the present invention.

FIG. 2 is a plane sectional view taken along line AA in FIG.

FIG. 3 is a plan sectional view taken along line BB in FIG. 1;

FIG. 4 is a plan sectional view taken along line CC in FIG. 1;

FIG. 5 is an explanatory front view showing a schematic configuration of a modification of the embodiment of FIG. 1;

FIG. 6 is an explanatory front view showing a schematic configuration of a modification of the embodiment of FIG. 1;

[Explanation of symbols]

 1,21,31 Mixing and stirring device for excavated soil 2 Vertical axis 11,12,13,14 Outboard wing body 11b, 12b, 13b Tip of outward wing body 51 Frame 58,59 Inward wing body G Axis of vertical axis

Claims (3)

[Claims] 1. A plurality of outwardly projecting wings are provided on the longitudinal axis so as to have a smaller diameter toward the lower side,
Outside the tips of the plurality of outboard wings, vertically connected,
A frame body having a smaller diameter as it goes downward is provided, and the frame body is provided with an inward wing body projecting inward so as to be located between the upper and lower outward wing bodies, and the frame body is attached to the vertical axis. Characterized in that both the vertical axis and the frame body are separately and independently rotated around the axis of the vertical axis by a rotary drive means. apparatus. 2. A plurality of outwardly protruding wings are provided on the longitudinal axis so as to have a smaller diameter toward the lower side,
Outside the tips of the plurality of outboard wings, vertically connected,
A frame body having a smaller diameter as it goes downward is provided, and the frame body is provided with an inward wing body projecting inward so as to be located between the upper and lower outward wing bodies, and the frame body is attached to the vertical axis. The excavated soil mixing and stirring device, wherein the frame is not rotated while the vertical axis is rotated by a rotation driving means around the axis of the vertical axis. . 3. A plurality of outwardly protruding wings are provided on the vertical axis so as to have a smaller diameter toward the lower side,
Outside the tips of the plurality of outboard wings, vertically connected,
A frame body having a smaller diameter as it goes downward is provided, and the frame body is provided with an inward wing body projecting inward so as to be located between the upper and lower outward wing bodies, and the frame body is attached to the vertical axis. Characterized in that the frame body is rotated around the axis of the vertical axis by the rotation driving means, while the vertical axis is not rotated. .