JP4536094B2 - Auger head and crusher provided with the same - Google Patents

Description

The present invention relates to an auger head and a crushing apparatus including the auger head . More specifically, the present invention relates to an auger head for crushing a foundation concrete pile buried in the ground in the ground and a crushing apparatus including the auger head .

  For example, when rebuilding a building for redevelopment in a metropolitan area, it is necessary to dismantle and remove the old building and also remove the foundation. In particular, many large-scale buildings have concrete piles buried under the foundation in order to stabilize the foundation, and these concrete piles must be removed when the foundation is removed.

  As a method for removing the concrete pile, there are a method of disposing the concrete pile by pulling it out from the ground and crushing it, and a method of crushing it into the ground and leaving it buried in the ground. In the method of pulling out a concrete pile, since a large-scale device is required and the cost required for the construction is high, in recent years, there is a tendency to employ a method of crushing in the ground where the construction can be performed relatively inexpensively.

  As an apparatus which crushes a concrete pile in the ground, there exists a pile crushing apparatus of patent document 1, for example. This crushing device is a rod driven by a normal pile driving machine, a screw provided at the lower end of the rod, a crushing blade provided to crush the upper end surface of the concrete pile at the tip of the screw, It is a structure provided with a cylindrical guide cap that rotates integrally with the screw and that has a malleable part covering the upper end of the concrete pile, and a cutting blade that is provided at the lower end of the guide cap. The crushing blade is provided near the lower end inside the guide cap.

JP 63-161222 A

  In developing a new auger head, the inventor of the present application first made a prototype device similar to the pile crushing device described in Patent Document 1 and tried an experiment for actually crushing a concrete pile on site. In this experiment, when the concrete piles were crushed to some extent, the rod could not be delivered from the position where it was, and a phenomenon that could not be crushed occurred.

  Therefore, when the rod was lifted and the crushing device was verified, the crushing blade inside the guide cap was clogged with crushed crushed material (concrete and rebar fragments) and soil in an extremely tight state. Etc. could not be sent to the upper screw side, and the crushing blade was unable to contact the concrete pile. It is presumed from this state that the pressure of the crushed material in the vicinity of the crushing blade inside the guide cap is extremely high and clogged with the work.

In other words, the crushed material crushed by the crushing blade has an apparent volume that is increased because a minute gap is formed between the crushed pieces. Moreover, the crushing blade for crushing the concrete pile is inside the cylindrical guide cap, and the evacuation place for the pressure of the crushed material whose volume has increased is only in the direction toward the upper screw. In this case, if the balance between the amount of crushed material that is crushed and sent upward and the amount of soil, etc. that enters the guide cap from below is lost, that is, the apparent volume increases and the resistance when sending upward increases. If the rise of the crushed material is delayed, the pressure inside the guide cap immediately increases, and the crushed material, soil, and the like are in close contact with the inner wall of the guide cap and are clogged.
Therefore, it is strongly presumed that the pile crushing apparatus described in Patent Document 1 having the same structure as that of the prototype produced the same result.

  Therefore, an object of the present invention is to crush concrete fragments or the like crushed with a crushing blade and soil and stones entering the guide cap from below in or near the guide cap when crushing the concrete pile. By preventing this, an auger head capable of smoothly and efficiently crushing a concrete pile in the ground and a crushing apparatus using the auger head are provided.

Means taken by the present invention to solve the above problems are as follows.
The present invention
An auger head that is attached to the tip of an auger drill of a work machine and crushes a concrete pile,
A screw having a double helix spiral blade on its shaft;
An inner peripheral surface of the wall portion is fixed to the outer peripheral surface of the spiral blade of the screw, and a cylindrical guide body provided with a cutting blade at the lower end portion;
A crushing blade provided inside the guide body and at the lower edge of the spiral blade,
In the position corresponding to the tip of the crushing blade in the wall portion of the guide body or in a position including the vicinity thereof, a discharge port whose upper side is open is provided oppositely,
The upper end surface of the wall portion of the guide body is formed in a spiral shape along the spiral shape of the spiral blade of the screw except for the opening portion of the upper portion of the discharge port, and is along the upper surface of the spiral blade.
Auger head.

The present invention
A working machine with a reader,
An auger drill attached to the leader so as to be able to rotate and lift; and
The above-mentioned auger head attached to the tip of the auger drill;
It is a crushing device provided with.

Oh Gaheddo of the present invention, the outlet is in the upper part containing the location or the vicinity thereof corresponding to the tip of the crushing blade position, provided in the required width in the circumferential direction toward downwardly therefrom for crushing blades More preferably.

The present invention is
A working machine with a reader,
An auger drill attached to the reader so as to be capable of rotational driving;
The above-mentioned auger head attached to the tip of the auger drill;
An elevating drive device for elevating and lowering the auger drill along the leader;
With
The lifting drive is
A rack provided vertically in the leader;
An elevating drive motor provided on the auger drill side;
The crushing apparatus includes a pinion that is driven by the lifting motor and meshes with the rack .

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(Function)
The operation of the auger head and crushing apparatus according to the present invention will be described. Note that, here, each constituent element of the present invention is given and described in correspondence with the reference numerals given to the respective parts in the embodiments described later, but this provision of reference numerals is only for easy understanding of the explanation. However, it does not mean that the constituent elements are limited to the above-described parts.

Place the crushing device (B) in the position to crush the concrete pile, rotate the auger drill (9), and move the auger head (H) attached to the tip of the auger drill (9) into the ground. Put the guide body (2) on the upper end of the concrete pile buried inside.
By rotating the auger head (9) and further descending, the concrete piles are sequentially crushed from above by the crushing blade (3) inside the guide body (2).

  Further, the ground (such as soil and stone) around the concrete pile is cut by a cutting blade (4) provided at the lower end of the guide body (2). The cut soil and stone enter between the outer peripheral surface of the concrete pile and the inner wall of the guide body (2) as the auger head (H) descends.

  On the other hand, the crushed material generated by crushing by the crushing blade (3) is sequentially sent upward by the screw (1) or the like as the auger head (H) descends while rotating. When the crushed material is finely crushed, a minute gap is formed between them. As a result, the apparent volume increases above the crushing blade (3) and the pressure also increases.

  The cut soil or stone that has passed between the outer peripheral surface of the concrete pile and the inner wall of the guide body (2) is guided from the discharge port (20, 21) even if the transport of the crushed material is delayed. Since the pressure can be released moderately by being discharged out of the body (2), it is relatively free from clogging soil and stones with the crushed material by applying pressure from below to the crushed material, for example. It is assumed that a low pressure can be maintained.

  That is, since the cut soil and stone do not apply a large pressure to the upper crushed material from below, it is possible to prevent the crushed material and soil from clogging around the crushing blade (3). Seem. As a result, the crushed material is smoothly fed upward, and the concrete pile can be crushed smoothly and efficiently in the ground by the auger head (H).

According to the present invention, the soil and stones that have entered the guide body from between the outer peripheral surface of the concrete pile and the guide body wall during the crushing operation do not apply a large pressure from below to the crushed material on the upper side. Can prevent crushing materials and soil from becoming hard and clogging. The reason for this is underground, and it is not always clear, but the soil and stone are discharged from the discharge port to the outside of the guide body even if the conveyance of the crushed material crushed by the crushing blade is delayed. By doing so, it is possible to release the pressure appropriately, so that it is presumed that the pressure can be maintained without applying pressure to the crushed material from below and clogging it with the crushed material.
Thereby, a crushed material will be smoothly sent upwards and the concrete pile in the ground can be crushed smoothly and efficiently.

  The present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a front view showing an embodiment of an auger head according to the present invention,
2 is a rear view of the auger head,
3 is a side view of the auger head.
4 is a plan view of the auger head,
FIG. 5 is a bottom view of the auger head.
FIG. 6 is an upper perspective view of the auger head.
FIG. 7 is a lower perspective view of the auger head,
FIG. 8 is an explanatory view showing the structure of the auger head.

  The auger head H is used by being attached to the tip of an auger drill 9 of a working machine 7 constituting a crushing device B described later. The auger head H is an attachment that is detachable from the auger drill 9.

  The auger head H includes an iron screw 1, a similarly iron guide body 2 provided below the screw 1 (based on use), a crushing blade 3 provided inside the guide body 2, A cutting blade 4 provided at the lower end of the guide body 2 is provided. Hereinafter, each of these parts will be described in detail.

  The screw 1 has a structure in which a shaft 10 is provided with double spiral spiral blades 11 and 11a. The spiral blade may be of a single type. However, for example, if the shaft 10 is shortened and the spiral blade of the auger drill 9 can be substantially substituted, the spiral blade is not always necessary. In this case, the crushing blade is attached to the inside of the guide body 2 via a member other than the spiral blade (for example, a rod laid in the diameter line direction).

  A connection shaft 12 having a hexagonal cross section is provided at the upper end portion of the shaft 10, and the connection shaft 12 has a structure for connecting to the auger drill 9 (detailed description is omitted). Further, the lower end portions of the spiral blades 11 and 11 a are set at substantially the same height as the lower end of the shaft 10.

  The lower edge part of the spiral blades 11 and 11a is provided in the diameter direction of the guide body 2 described later. One spiral blade 11 is formed at a substantially half pitch, and a crushing blade made of a cemented carbide having a hardness and strength capable of crushing concrete, reinforcing bars, etc. at three locations in the diameter line direction at the lower edge thereof (bit) 3) are arranged side by side.

  Further, the other spiral blade 11a is formed at substantially one pitch, and crushing blades 3 are juxtaposed at two positions in the diameter line direction at the lower end edge thereof at a required interval. The crushing blade 3 of the spiral blade 11 and the crushing blade 3 of the spiral blade 11a are fixed so as to face the same direction in the rotation direction. Each crushing blade 3 is provided so as to be inclined downward in the rotational direction in parallel with the inclination direction of the spiral blades 11 and 11a.

  A guide body 2 having a structure in which discharge ports 20 and 21 described later are provided at two locations opposite to the wall portion of the cylindrical body is fixed to the lower end portion of the screw 1. The guide body 2 has an inner diameter that is slightly larger than the outer diameter of the concrete pile to be crushed, and the lower side of the guide body 2 can be externally fitted over the concrete pile. In addition, the internal diameter of the guide body 2 is appropriately set according to the standard of the concrete pile, and the number of the crushing blades 3 is also appropriately set by changing the internal diameter of the guide body 2.

The guide body 2 is similarly formed in a spiral shape so that the two upper end surfaces 22 and 23 follow the spiral shape of the outer peripheral portion of the lower side of the spiral blades 11 and 11a. The guide body 2 is welded so that the inner peripheral surface is aligned with the outer peripheral surface of the slats of the spiral blades 11 and 11a, and the spiral upper end surfaces 22 and 23 are along the upper surfaces of the spiral blades 11 and 11a. It is fixed.
And in the wall part of the guide body 2, the window-shaped discharge ports 20 and 21 are located in the diameter line direction of the guide body 2 in the position where the crushing blade 3 of the spiral blade 11 and the crushing blade 3 of the spiral blade 11a can be seen from the outside. It is provided opposite to each other.

  The upper side of the discharge ports 20, 21 corresponds to the interrupting portion in the circumferential direction of the upper end surfaces 22, 23, and the discharge ports 20, 21 are at positions where the upper portion corresponds to the tip of the crushing blade 3 or the vicinity thereof. From there, it is greatly opened downward from the crushing blade 3, and is provided with a required width in the circumferential direction. Moreover, the edge part 24 of the circumferential direction both sides of the discharge ports 20 and 21 is provided in the perpendicular direction, and the lower end edge part is formed of the horizontal part 26 and the inclined part 27.

  A large number of cemented carbide cutting blades 4 are fixed to the lower end edge of the guide body 2 at a required interval over the entire circumference. Each cutting blade 4 is composed of a fixing metal fitting and a bit (both of which are omitted from the reference numerals), and the bit has hardness and strength that can be excavated so as to cut the ground around an embedded concrete pile. In addition, a cutting blade 4a is provided at one location above the cutting blade 4 on the inner peripheral surface of the guide body 2 so that soil does not easily adhere to the inner peripheral surface.

FIG. 9 is an explanatory view showing the structure of the crushing apparatus according to the present invention,
FIG. 10 is an explanatory diagram in plan view showing the structure for attaching the elevating drive device and the leader of the crushing device,
FIG. 11 is an AA cross-sectional explanatory view in FIG.

  The crushing device B includes a work machine 7, a leader 8, an elevating drive device 6 attached to the elevating drive device 6 along the leader 8, an auger drill 9 attached to the elevating drive device 6, and a tip of the auger drill 9. The auger head H attached to (lower end) is provided. The auger drill 9 is rotationally driven in the axial circumferential direction by the elevating driving device 6 and is driven to elevate. The lifting device 6 and the rack 80 and pinion 61 described later constitute the lifting device according to the present invention.

  The elevating drive device 6 is provided with one rotary drive motor 62 for rotating the auger drill 9 and four elevating drive motors 60, one on the left and one on the left. The rotation drive motor 62 and the lift drive motor 60 are hydraulic motors, but other motors such as an electric motor may be employed. A pinion 61 is fixed to the rotating shaft of each lifting drive motor 60. On the other hand, the leader 8 is provided with a rack 80 over almost the entire length in the vertical direction. The rack 80 is a long plate having a required width, and teeth that engage with the pinion 61 are provided on both sides in the width direction over the entire length.

  The elevating drive device 6 can move up and down along the leader 8 by meshing each pinion 61 with the rack 80 from both sides and rotating each pinion 61 by each elevating drive motor 60. In addition, a guide tube 81 is provided below the leader 8 to insert the auger drill 9 and keep the auger drill 9 steady.

(Function)
With reference to FIG. 1 thru | or FIG. 10, the effect | action of the crushing apparatus B provided with the auger head H is demonstrated.
The soil above the upper end of the concrete pile P buried in the ground is removed beforehand. And the crushing apparatus B is installed in the position which crushes the concrete pile P, and the leader 8 is stood | rightened vertically. The raising / lowering drive device 6 is operated, the auger drill 9 is moved down, and the guide body 2 of the auger head H at the tip of the auger drill 9 is put on the upper end portion of the concrete pile P buried in the ground by external fitting.

  The auger drill 9 is rotationally driven by the elevating drive device 6, and the auger drill 9 is further lowered into the ground. Thereby, the concrete pile P is sequentially crushed from the upper part by the crushing blade 3 of the auger head H, and the reinforcing bars used in the concrete pile P are similarly crushed.

  Moreover, since the ground (soil, stone, etc.) around the concrete pile P is cut by the cutting blade 4 provided at the lower end of the guide body 2, resistance to descending is reduced. The cut soil and stone enter between the outer peripheral surface of the concrete pile P and the inner wall of the guide body 2 as the auger head H is lowered.

  On the other hand, crushed materials such as concrete fragments generated by crushing by the crushing blade 3 are sequentially sent to the upper auger drill 9 side by the spiral blades 11 and 11a as the auger head H descends while rotating. Further, since the crushed material is finely crushed by the crushing blade 3, a minute gap is formed between them, and as a result, the apparent volume increases above the crushing blade 3 and the pressure also increases. Conceivable.

  And when the said crushing progresses, it can fully absorb the increase in pressure by the apparent volume of the crushing material increasing in the pile hole (position where the screw 1 is located) by letting the crushing material escape upward. It is thought that the transport of the crushed material upward is delayed. In addition, the cut soil and stone that have passed between the outer peripheral surface of the concrete pile P and the inner wall of the guide body 2 are discharged from the discharge ports 20 and 21 to the outside of the guide body 2 so that the pressure is moderately increased. Since it can escape, even if the conveyance of the crushed material upward is delayed as described above, no pressure more than necessary is applied to the crushed material from below. That is, it is estimated that the cut soil and stone can maintain a relatively low pressure without clogging the soil, stone and crushed material around the screw 1 or inside the guide body 2.

  That is, since the cut soil and stone do not apply a large pressure to the upper crushed material from below, the crushed material such as concrete debris and soil or the like are prevented from clogging around the crushing blade 3. It is considered possible. Thereby, the crushed material crushed with the crushing blade will be smoothly sent upward without clogging, and the auger head H can smoothly and efficiently crush the concrete pile P in the ground.

  Note that the terms and expressions used in the present specification are merely explanatory and not restrictive, and do not exclude terms and expressions equivalent to the above terms and expressions. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the technical idea.

The front view which shows one Embodiment of the auger head which concerns on this invention. Rear view of the auger head. Side view of the auger head. The top view of an auger head. The bottom view of an auger head. The upper perspective view of an auger head. The lower perspective view of an auger head. Explanatory drawing which shows the structure of an auger head. Explanatory drawing which shows the structure of the crushing apparatus which concerns on this invention. Plan view explanatory drawing which shows the raising / lowering drive device of a crushing apparatus, and the attachment structure of a leader. AA sectional explanatory drawing in FIG.

B crusher H auger head 1 screw 10 shaft 11, 11a spiral blade 12 connecting shaft 2 guide body 20, 21 discharge port 22, 23 upper end surface 24 edge 26 horizontal portion 27 inclined portion 3 crushing blade 4 cutting blade 4a cutting blade 6 Lifting drive device 60 Lifting drive motor 61 Pinion 62 Rotation drive motor 7 Working machine 8 Leader 80 Rack 81 Guide tube 9 Auger drill P Concrete pile

Claims (3)

An auger head that is attached to the tip of an auger drill (9) of a work machine and crushes a concrete pile,
A screw (1) provided with a double helix spiral blade (11, 11a) on the shaft (10);
A cylindrical guide body (2) having an inner peripheral surface of a wall portion fixed to an outer peripheral surface of the spiral blade (11, 11a) of the screw (1) and having a cutting blade (4) at a lower end portion. )When,
The crushing blade (3) provided in the lower end edge of the spiral blade (11, 11a) inside the guide body (2),
A discharge port (20, 21) whose upper side is open is opposed to a position corresponding to or near the tip of the crushing blade (3) in the wall of the guide body (2). Provided,
The upper end surface (22, 23) of the wall portion of the guide body (2) is a spiral shape of the spiral blades (11, 11a) of the screw (1) except for the open portion at the top of the discharge port (20, 21). Formed along the upper surface of the spiral blade (11, 11a),
Auger head. A work machine (7) with a leader (8);
An auger drill (9) attached to the leader (8) so as to be able to rotate and lift; and
The auger head (H) according to claim 1 , attached to the tip of the auger drill (9),
A crushing device. A work machine (7) with a leader (8);
An auger drill (9) attached to the leader (8) for rotation drive;
2. The auger according to claim 1, wherein the auger drill is attached to the tip of the auger drill.
(H),
Elevating drive device (6) for raising and lowering the auger drill (9) along the leader (8),
With
The elevating drive device (6)
A rack (80) provided vertically in the leader (8);
A lifting drive motor (60) provided on the auger drill (9) side,
A crushing apparatus comprising a pinion (61) driven by the lifting motor (60) and meshed with the rack (80) .

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