JPH09125857A - Excavated soil accompanying turn preventive device for auger machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the accompanying turn of a shaft and excavated soil by pushing the rotational preventive member of a swing preventive member against the cover body side at the earth pressure of excavated soil and bringing the rotational preventive member into contact with the internal surface of a cover when an excavating tool is rotated. SOLUTION: The outer circumferential surface of a cylindrical body 52 is brought into contact with the internal surface of a pit section formed by an excavating tool 24 with the lowering of a shaft 18, and each front end 60, 64 of a pair of rotational preventive members 46, 50 is brought into contact with the internal surface of the cylindrical body 52. The cylindrical body 52 is turned by the force of inertia at the time of and speed difference is generated between the shaft 18 and the cylindrical body 52, and frictional force B is generated on the outer circumferential surface of the cylindrical body 52. Passive earth pressure C works to a reinforced arm member 54, and force, by which the cylindrical body 52 is turned in the counterclockwise direction, is generated. When the excavating tool 24 is revolved, each front nose 60, 64 of the rotational preventive members 46, 50 for swing preventive members 36, 38 is pushed against the cylindrical body 2 side at excavation earth pressure and brought into contact with the internal surface of the cylindrical body 52, and the revolution of a pair of the swing preventive members 36, 38 with the rotation of the shaft 18 can be inhibited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing coexistence of excavated soil in an auger machine, and more particularly, to provide a cover body that comes into contact with the inner surface of a hole formed in the ground by the rotation of an excavator and to provide the inner surface of the cover body. The present invention relates to a co-rotation preventive device for excavated soil of an auger machine, which prevents the co-rotation of a rotary shaft and excavated soil by bringing a rotation prevention member of a shake prevention member into contact with.

[0002]

2. Description of the Related Art An auger machine is provided with a rotary member on a rotary shaft that is supported so as to be vertically movable. This rotating member has, for example, a ground excavating function to excavate the ground, or an agitation-mixing function to excavate soil and a soil stabilizer (eg, cement milk or water glass) poured from the tip of the rotating shaft. , Polymer materials, etc.) are mixed with stirring to form solidified columns for ground improvement in the ground.

[0003]

By the way, in a conventional auger machine, particularly an auger machine having a single rotating shaft, the excavated soil also rotates with the rotation of the rotating shaft, that is, a co-rotation state occurs. However, the excavated soil and the soil stabilizer cannot be satisfactorily mixed by stirring, and there is a disadvantage that a solidified column having sufficient strength cannot be formed.

In such a case, a shake preventing member having a length slightly smaller than the radius of rotation of the rotating member is provided on a supporting member rotatably supported in the middle of the rotating shaft, and the shake preventing member is grounded by the rotating member. It is conceivable to make a contact with the inner surface of the formed hole to prevent the rotation shaft from swinging and co-rotating.

However, in an auger machine having a single rotating shaft, if the shake preventing member has a length that is slightly smaller than the radius of rotation of the rotating member, the shake preventing member will rotate as the rotating shaft rotates. Therefore, there is a problem that the excavated soil is rotated and the excavated soil and the soil stabilizer cannot be well stirred and mixed.

Therefore, in order to eliminate such inconvenience,
A support member is rotatably supported in the middle of the rotary shaft, and a pair of anti-rotation members, which are shake prevention members having a length slightly smaller than the radius of rotation of the rotary member, are provided on the support member. A device has been proposed that prevents the rotation of the excavated soil due to the rotation of the rotating shaft by pushing and immersing the member into the unexcavated soil outside the radius of rotation of the rotating member (Japanese Patent Publication No. 58-29374).

However, the device disclosed in this publication has a disadvantage that the anti-rotation member is immersed in the unexcavated soil outside the radius of rotation of the rotating member, which increases the immersion resistance. Further, if the resistance of the unexcavated soil into which the anti-rotation member is immersed is uneven, the anti-rotation member is deflected in the direction in which the resistance becomes smaller and the rotation center of the rotation shaft is displaced.

[0008]

In order to eliminate the above-mentioned factors, the present invention provides an auger machine provided with a drilling tool having at least a ground excavating function on a single rotating shaft supported in a vertically movable manner. A support member is rotatably supported in the middle of the rotation shaft, and a shake prevention member having a length shorter than the radius of rotation of the excavator is provided so as to project diametrically with respect to the support member. A rotation shaft parallel to the rotation shaft is axially supported at the tip of the shake prevention member, and a rotation prevention member is fixedly provided on the rotation shaft, and the shake prevention member, the rotation shaft, and a part of the rotation prevention member are provided. And a cover body surrounding the inner surface of the hole formed in the ground by the rotation of the excavator and rotatably supporting the cover body in the middle of the rotating shaft by a reinforcing arm member, When turning the tool, this drilling tool Due to the earth pressure of the excavated soil excavated, the rotation preventing member of the shake prevention member is pressed toward the cover body to contact the inner surface of the cover body to prevent the rotation shaft and the excavated soil from rotating together. Characterize.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
The rotation preventing member of the shake preventing member is brought into contact with the inner surface of the cover body that comes into contact with the inner surface of the hole formed in the ground by the rotation of the excavator to prevent co-rotation of the rotating shaft and the excavated soil.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 6 show an embodiment of the present invention. In FIG. 5, reference numeral 2 is a self-propelled vehicle with a track that supports and moves the support column 4. This self-propelled vehicle 2
An auger machine 8 is suspended from the upper end of the column 4 by a support cable 6 so as to be able to move up and down. The auger machine 8 includes a drive mechanism 10 and a transmission 1 arranged below the drive mechanism 10.
And 2. Further, the auger machine 8 is held by the holding guide 14 on the column 4 so as to be able to move up and down.

The drive mechanism 10 and the transmission 12 are connected by a drive shaft 16. One end of a single rotary shaft 18 is connected to the transmission 12. As shown in FIGS. 4 and 5, the rotary shaft 18 has at least a rotating member having a ground excavating function, and in this embodiment, a rotating member having a ground excavating function and a stirring and mixing function of excavated soil and soil stabilizer. The member 20 is provided, and a spout 22 for pouring out the soil stabilizer is provided at the lower end.

The rotary member 20 comprises an excavator 24 and an agitator 26. The excavator 24 is provided on the lower end side of the rotary shaft 18. A plurality of stirrers 26 are provided on the top of the excavator 24. In this example,
For example, a nine-stage stirring tool 26 is provided. This stirring tool 2
6 are arranged symmetrically on both sides of the rotary shaft 18 in the radial direction, and are provided on the outer peripheral portion of the rotary shaft 18 with the stirring tools 26 adjacent to each other vertically offset by 90 degrees.

As a result, the auger machine 8 is lowered while rotating the single rotary shaft 18 by the drive mechanism 10, and as shown in FIG.
8 is excavated to form the hole 30, and then the excavated soil and the soil stabilizer poured out from the spout 22 are stirred and mixed by the stirring tool 26, and the solidified column (in the inner surface 32 of the hole 30) (Not shown).

As described above, in the auger machine 8 provided with the excavator 24 having at least the excavation function of the ground on the single rotating shaft 18 which can be lifted and lowered, as shown in FIG. 1 and FIG. A cylindrical support member 34 is rotatably supported between the excavator 24 and the agitator 26 in the middle of 18. The support member 34 is prevented from moving in the axial direction of the rotary shaft 18 by abutting each side peripheral edge at both ends in the axial direction with a blocking member (not shown) fixedly mounted on the rotary shaft 18. It is rotatably supported by.

On the support member 34, a pair of anti-vibration members (also referred to as “α blades”) 36, 38 having a length shorter than the turning radius of the excavator 24 are diametrically intersected with the support member 34. It is provided so as to project. At this time, the mounting positions of the pair of shake preventing members 36 and 38 to the supporting member 34 are facing each other as shown in FIGS. 2 and 3, and have a mounting angle of 180 degrees.

Rotating shafts 40 and 42, which are parallel to the rotating shaft 18, are axially supported at the tips of the pair of shake preventing members 36 and 38, respectively.

A pair of rotation blocking members 44, 46 and 4 are provided at the protruding vertical shaft ends of the rotary shafts 40 and 42.
By attaching the upper and lower ends of each end of 8 and 50,
These pair of rotation blocking members (also called “β blade”)
44, 46 and 48, 50 are rotatably supported.

Further, a part of the shake preventing members 36 and 38, the rotating shaft 40 and the rotation preventing members 44, 46 and 48 and 50, for example, a substantially upper half of the shake preventing members 36 and 38 is surrounded, and the ground 28 is rotated by the rotation of the excavator 24. A cover body, for example, a cylindrical body 52, which comes into contact with the inner surface 32 of the hole 30 formed in the above is provided, and the cylindrical body 52 is rotatably supported in the middle of the rotary shaft 18 by a reinforcing arm member 54.

When the excavator 24 rotates, the cylindrical body 52 is prevented from rotating by the earth pressure of the excavated soil excavated by the excavator 24.
6 and 48, 50 are pressed to the side of the cylindrical body 52 so as to contact the inner surface 56 of the cylindrical body 52 and prevent the rotating shaft 18 and the excavated soil from rotating together.

More specifically, the tip ends 5 of the pair of rotation preventing members 44, 46 and 48, 50 of the shake preventing members 36, 38, respectively.
8, 60 and 62, 64, FIGS. 2 and 3
In the above, the tips 60 and 64 contact the inner surface 56 of the cylindrical body 52 by the earth pressure of the excavated soil excavated by the excavator 24, and the pair of shake preventing members 3 associated with the rotation of the rotating shaft 18
Prevent rotation of 6, 38.

Next, the operation of this embodiment will be described.

When the auger machine 8 is used, the single rotating shaft 18 is rotated and lowered by the drive mechanism 10, first, the ground 28 is excavated by the excavator 24 to form the hole portion 30, and then the hole portion 30 is formed. The excavated soil and the soil stabilizer poured out from the spout 22 are stirred and mixed by the stirrer 26 to form a solidified column (not shown) in the inner surface 32 of the hole 30.

As the rotating shaft 18 descends, the excavator 2
4 and the rotation preventing members 36, 38 and rotation preventing members 44, 46 and 48, 50 provided on the rotary shaft 18 between the stirring tool 26 and the stirring tool 26.
Is immersed in the excavated soil in the hole 30 formed in the ground 28.

Then, the outer peripheral surface of the cylindrical body 52 comes into contact with the inner surface 32 of the hole 30 formed by excavating the ground 28 by the excavator 24, and the inner surface 56 of the cylindrical body 52 is paired by the earth pressure of the excavated soil. The tips 60 and 64 of the rotation blocking members 46 and 50 contact each other.

At this time, the tips 60 and 64 of the pair of rotation preventing members 46 and 50 on the inner surface 56 of the cylindrical body 52 are formed.
The contact causes the cylindrical body 52 to generate a force to rotate it in the counterclockwise direction A in FIG. Then, due to the inertial force, the cylindrical body 52 rotates in the clockwise direction in FIG. At this time, a speed difference naturally occurs between the rotary shaft 18 and the cylindrical body 52.

Further, as shown in FIG. 3, the outer peripheral surface of the cylindrical body 52 is brought into contact with the inner surface 32 of the hole portion 30, so that the cylindrical body 5 is
A frictional force B that tries to prevent the rotation of 2 in the counterclockwise direction is generated.

Further, as shown in FIG. 3, a passive earth pressure C acts on the reinforcing arm member 54 of the cylindrical body 52, and the cylindrical body 52 is
In FIG. 3, a force is generated to try to rotate in a counterclockwise direction.

As a result, when the excavator 24 is rotated,
Due to the earth pressure of the excavated soil excavated by the excavator 24, the tips 60 and 64 of the rotation preventing members 46 and 50 of the shake preventing members 36 and 38 are pressed toward the cylindrical body 52 side and the inner surface 56 of the cylindrical body 52 is pressed. It is possible to bring the pair of shake preventing members 36 and 38 into contact with each other to prevent the rotation of the pair of shake preventing members 36 and 38, and to generate a speed difference (relative speed difference) between the rotating shaft 18 and the cylindrical body 52. It is possible to reliably prevent co-rotation with the excavated soil and to prevent the rotation shaft 18 from swinging.

Therefore, the rotation of the excavated soil due to the rotation of the rotary shaft 18 can be prevented, and the excavated soil and the soil stabilizer can be well agitated and mixed to form a solid column having sufficient strength. be able to.

Further, the tips 60 and 64 of the rotation preventing members 46 and 50 of the shake preventing members 36 and 38 have the cylindrical body 5 respectively.
By contacting the inner circumference 56 of the second member 2,
6 and 38 are immersed only in the turning radius of the excavator 24, that is, in the excavated soil in the cylindrical body 52, there is no fear of being immersed in the unexcavated soil, and a substantially uniform resistance can be obtained, which is practically advantageous. In addition, the conventional anti-vibration member is prevented from increasing the excavation resistance due to being immersed in the unexcavated soil outside the radius of gyration and the displacement of the rotation center due to the uneven resistance of the unexcavated soil.

Further, the rotation-preventing members 46 and 50 of the shake-preventing members 36 and 38 are pressed toward the cylindrical body 52 side by the earth pressure of the excavated soil, and the tips 60 of the rotation-preventing members 46 and 50 are attached to the inner surface 56 of the cylindrical body 52. And 64 are brought into contact with each other to stop the rotation of the rotation preventing members 46 and 50 and the rotation of the shake preventing members 36 and 38, whereby the shake of the rotary shaft 18 can be prevented and the distortion of the hole portion 30 can be prevented. Therefore, the ground 28 can be excavated to the required size, and the solidified column having the required size can be formed.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, the shake preventing members 36, 38 and the rotation preventing members 44, 46, 48, 50 are provided only on the rotary shaft 18 between the excavator 24 and the agitator 26 on the lower end side of the rotary shaft 18. Alternatively, as shown in FIG. 6, the rotary shaft 18 may be provided on the rotary shaft 18 between the agitators 26 provided in a plurality of stages in the upper middle of the rotary shaft 18.

As described above, the shake preventing members 36 and 38 and the rotation preventing members 44, 46 and 48 and 50 are connected to the rotary shaft 18.
By providing the lower part and the middle part in two stages, the distortion of the hole 30 formed in the ground 28 can be more surely prevented,
It is possible to excavate the ground 28 to a required size, to form a solidified column having a required size, and to prevent the rotation of the excavated soil due to the rotation of the rotary shaft 18, and to form the excavated soil and the soil stabilizer. It is possible to satisfactorily stir and mix, to form a solidified column having sufficient strength.

Further, the anti-vibration member is provided in an asymmetric position with respect to the rotary shaft, that is, the anti-vibration member having a different distance from the axis of the rotary shaft is provided with a rotary shaft, and each of these rotary shafts is long. It is also possible to provide rotation blocking members of different heights.

Further, in the embodiment of the present invention, the support member is provided with the two shake preventing members, but the number of the shake preventing members provided is one or three or more, for example, as shown in FIG. As shown by the alternate long and short dash line, four pieces can be arranged.

Furthermore, in an embodiment of the present invention,
The mounting position of the pair of shake prevention members to the support member is set to have a mounting angle of 180 degrees as a position facing each other. However, when two shake prevention members are arranged, the two shake prevention members are attached. It is also possible for the angle to be less than 180 degrees.

As shown in FIG. 7, the inner surface 56 of the cylindrical body 52 is provided with a plurality of inwardly projecting projections 72, for example, 16 projections 72 at equal intervals around the circumference. It can also be configured to prevent rotational movement of members 36,38.

By the earth pressure of the excavated soil, the cylindrical body 5
When the tips 60 and 64 of the pair of rotation preventing members 46 and 50 of the shake preventing members 36 and 38 come into contact with the inner surface 56 of the second inner surface 56, the inner surface 5 of the cylindrical body 52 is formed by the sixteen protrusions 72.
6 and the respective tip ends 60 and 64 of the pair of rotation preventing members 46 and 50 become firm, and the shake preventing members 36, 3
The rotation preventing members 46 and 50 of FIG.

Further, in the embodiment of the present invention, the swing preventing members 36 and 38, the rotating shafts 40 and 42, and the rotation preventing members 44, 46 and 48 and 50 are partially enclosed and the excavator 24 rotates. The cylindrical body 52, which is a cover body that comes into contact with the inner surface 32 of the hole 30 formed in the ground 28 by the above, is used. However, as shown in FIG. 8, an annular rod-shaped member 82 is used instead of the cylindrical body 52. On the inner surface 84 of the rod-shaped member 82,
For example, the rotation prevention member 46 of the shake preventing member 36 may be brought into contact with the shake preventing members 36 and 38 to prevent the rotation of the shake preventing members 36 and 38 due to the rotation of the rotating shaft. Then, a speed difference (relative speed difference) is generated between the rotating shaft and the rod-shaped member 82, and it is possible to reliably prevent co-rotation of the rotating shaft and the excavated soil.

Further, as shown in FIGS. 9 and 10, instead of the cylindrical body 52, the cylinder may be divided into, for example, four, and the cover member 92 may be formed by only two facing parts. Then, three protrusions 96 are formed on the inner surface 94 of the cover member 92, respectively, and the tips 60 and 64 of the inner surface 94 of the cover member 92 and the pair of rotation blocking members 46 and 50, respectively.
The contact state with can be solid. At this time, when forming the cover member 92, not only four divisions but five or more divisions can be performed. In addition, the inner surface 9 of the cover member 92
Although three protrusions 96 are formed on each of the four
Even if 6 is not provided, a speed difference (relative speed difference) can be generated between the rotary shaft and the cover member 92.

Further, in the embodiment of the present invention, the cover body is a cylindrical body and is brought into contact with the entire inner surface of the hole formed in the ground by the rotation of the excavator, but with the cover member 92 as described above. In addition, it is possible that the cover body is, for example, an elliptical shape, and at least a part of the outer circumference of the cover body contacts the inner surface of the hole.

[0044]

As described in detail above, according to the present invention, in the auger machine provided with the excavator having at least the excavating function of the ground on the single rotating shaft supported so as to be able to move up and down, it is supported in the middle of the rotating shaft. The rotatably supporting member is provided, and the shake preventing member having a length shorter than the turning radius of the excavator is provided so as to project so as to intersect the supporting member in the diametrical direction. A parallel rotation shaft is rotatably supported, and a rotation prevention member is fixedly provided on the rotation shaft. The rotation prevention member, the rotation shaft, and a part of the rotation prevention member are surrounded, and the ground is formed by rotation of the excavator. The cover body that comes into contact with the inner surface of the hole formed in the base is provided and the cover body is rotatably supported in the middle of the rotation axis by the reinforcing arm member, and the excavated soil excavated by the excavator when the excavator is rotated. Shake prevention part due to earth pressure Since the rotation prevention member is pressed against the cover body side to make contact with the inner surface of the cover body to prevent co-rotation of the rotary shaft and the excavated soil, when the excavator is rotated, the excavated soil excavated by the excavator is The rotation preventing member of the shake preventing member is pressed against the cover body side by the earth pressure so as to be brought into contact with the inner surface of the cover body, and the rotation of the pair of shake preventing members due to the rotation of the rotating shaft can be prevented. A speed difference (relative speed difference) occurs between them, so that co-rotation of the rotary shaft and excavated soil can be reliably prevented, and at the same time, runout of the rotary shaft can be prevented. Therefore, the rotation of the excavated soil due to the rotation of the rotating shaft can be prevented, the excavated soil and the soil stabilizer can be well mixed with stirring, and a consolidated column having sufficient strength can be formed. Further, since the rotation preventing member of the shake preventing member comes into contact with the inner surface of the cover body, the shake preventing member is immersed only in the turning radius of the excavator, that is, in the excavated soil in the cover body, and is immersed in the unexcavated soil. It is possible to obtain a substantially uniform resistance without any damage, which is practically advantageous, and increases the excavation resistance and the unexcavated soil due to the conventional shake prevention member being immersed in the unexcavated soil outside the turning radius. Displacement of the rotation center due to uneven resistance does not occur. Further, the rotation preventing member of the shake preventing member is pressed toward the cover body by the earth pressure of the excavated soil, and the rotation preventing member is brought into contact with the inner surface of the cover body to stop the rotation of the rotation preventing member and the rotation of the shake preventing member. As a result, swing of the rotary shaft can be prevented, distortion of the hole can be prevented, the ground can be excavated to a required size, and a solidified column having a required size can be formed.

Further, when the cover body is a cover body having a plurality of protrusions projecting inwardly on the inner surface in order to prevent the rotation preventing member from rotating, the cover body is protected by the earth pressure of excavated soil. When the rotation preventing member of the shake preventing member comes into contact with the inner surface, the contact portion between the inner surface of the cover body and the rotation preventing member becomes firm due to the protrusion, and the rotation operation of the rotation preventing member of the shake preventing member is reliably prevented. obtain.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a main part of an excavated soil co-rotation preventing device for an auger machine showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view of an essential part of a coexistence prevention device for excavated soil of an auger machine.

FIG. 3 is a schematic enlarged plan view of a cylindrical body and a shake prevention member of the excavated soil co-rotation prevention device of the auger machine.

FIG. 4 is a front view of a rotary shaft of the auger machine.

FIG. 5 is a schematic front view of the auger machine.

FIG. 6 is a front view showing a modified example of the rotary shaft of the auger machine.

FIG. 7 is an enlarged plan view of an essential portion of the excavated soil co-rotation preventing device for an auger machine showing another first embodiment of the present invention.

FIG. 8 is a schematic enlarged perspective view of an excavated soil co-rotation preventing device for an auger machine showing another second embodiment of the present invention.

FIG. 9 is an enlarged side view of the main part of the excavated soil co-rotation preventing device for an auger machine showing a third embodiment of the present invention.

FIG. 10 is an enlarged plan view of an essential portion of the excavated soil co-rotation prevention device of the auger machine.

[Explanation of symbols]

 2 Self-propelled vehicle 4 Strut 6 Support line 8 Auger machine 10 Drive mechanism 12 Transmission 14 Holding guide 16 Drive shaft 18 Rotating shaft 20 Rotating member 22 Spout 24 Excavator 26 Stirrer 28 Ground 30 Hole 32 Inner surface 34 Supporting member 36 , 38 Anti-vibration member (α blade) 40, 42 Rotating shaft 44, 46 Rotation blocking member (β blade) 48, 50 Rotation blocking member (β blade) 52 Cylindrical body 54 Reinforcing arm member 56 Inner surface 58, 60 Tip 62, 64 tip

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[Procedure amendment]

[Submission date] December 22, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

FIG. 4

[Figure 3]

[Figure 5]

FIG. 6

FIG. 7

[Figure 8]

FIG. 9

FIG. 10

Claims (2)

[Claims] 1. An auger machine having a single rotary shaft that is liftably supported and provided with an excavator having at least a ground excavating function, and a support member is rotatably supported in the middle of the rotary shaft. A shake prevention member having a length shorter than the turning radius of the excavator is provided so as to project so as to intersect the support member in the diametrical direction, and a pivot shaft parallel to the rotation axis is pivotally supported at the tip of the shake prevention member. A hole formed in the ground by the rotation of the excavator and surrounding the shake prevention member, the rotation shaft and a part of the rotation preventing member by fixing the rotation preventing member to the rotation shaft. A cover body that contacts the inner surface of the section, and the cover body is rotatably supported in the middle of the rotating shaft by a reinforcing arm member, and the earth pressure of the excavated soil excavated by the excavator when the excavator rotates. Rotation of the shake prevention member An excavating soil co-rotation preventing device for an auger machine, characterized in that the rolling prevention member is pressed against the cover body side to contact the inner surface of the cover body to prevent co-rotation of the rotary shaft and excavation soil. 2. The cover body according to claim 1, wherein the cover body is a cover body having a plurality of protrusions projecting inwardly on an inner surface thereof so as to prevent rotation of the rotation preventing member. Equipment for preventing excavated soil from rotating together with an auger machine.