JP3323634B2 - Earth auger equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth auger device which excavates the ground vertically to form a hole for piling or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a ground auger device provided in a large pile driver used at a construction site is provided on a pile driver 101 so as to be able to be turned upside down and stand upright during work. A mast 103 to be provided, an auger screw 105 having blades spirally wound around a long rotating shaft,
An auger drive 107 for rotating and driving the auger screw 105, a wire 109 for suspending the auger screw 105 and the auger drive 107, and the like are provided. And formed holes for pile driving.

[0003]

However, according to the prior art, the auger drive 107 weighs about 15 tons when it is large, and the mast 103 has
The height was about 33 meters. Therefore, when the auger drive 107 is raised to the top in a state where the mast 103 is set upright, the mast 10
3 has a heavy upper part and has a problem that the pile driver 101 is in an unstable state in which the pile driver 101 is likely to fall down due to a high center of gravity.

Conventionally, a crane or the like has been prepared separately from the pile driver 101, and an auger screw has been suspended by the crane to assist the pile driver 101 so as not to fall. . However, the work of preparing a crane to perform the necessary connection work and operating the pile driver and the crane, respectively, is costly in terms of both man and material, and has a high center of gravity. It did not fundamentally eliminate the stable situation.

Accordingly, an object of the present invention is to provide an earth auger device which has a low center of gravity and can be operated in a state in which it is extremely difficult to fall down.

[0006]

In order to achieve the above-mentioned object, the present invention has a blade spirally wound around a long rotating shaft along a vertically standing mast. In an earth auger device in which an auger screw is vertically provided, the auger screw is lowered while being driven to rotate, and the ground is excavated vertically to form a hole for pile driving, etc. A rotation mechanism through which the auger screw is passed through the center, a clamping mechanism that is disposed so as to be able to rotate integrally with the rotation mechanism, and that can clamp the auger screw that is passed through the rotation center at any position in the longitudinal direction, An elevating mechanism for elevating and lowering the rotating mechanism and the nipping mechanism along the mast , wherein the nipping mechanism is
It is characterized in that the spiral blade portion of the Liu is sandwiched from above and below.

According to the earth auger device of the present invention, the holding mechanism holds the auger screw at an arbitrary position in the longitudinal direction, and simultaneously rotates with the rotating mechanism to apply a rotating force to the auger screw, and is rotated by the elevating mechanism. The mechanism and the holding mechanism are raised and lowered along the mast, and excavation by the auger screw and extraction of the auger screw are performed. That is,
The auger screw is rotated by transmitting a driving force at an arbitrary position in the longitudinal direction. Therefore, the driving mechanism including the relatively heavy rotating mechanism, the holding mechanism, and the elevating mechanism can be arranged, for example, at a position that is half the length of the auger screw or at a position lower than that. Become a low center of gravity.

When the auger screw is held at a low position,
When excavating, it becomes impossible to excavate before the auger screw completely enters the ground, but at that time, release the clamping by the clamping mechanism, raise the drive mechanism by the lifting mechanism, and reclamp the upper part of the auger screw. The work of digging is repeated. As described above, when the lifting mechanism is configured to excavate by repeating the lifting and lowering little by little, the mast on which the lifting mechanism is mounted can be lowered, and the center of gravity can be further reduced.

The elevating mechanism referred to here is a mechanism that moves up and down using a driving force, for example, a mechanism that moves up and down by driving a pinion that meshes with a rack provided on a mast, and a mechanism that uses a driving force when ascending. May be any mechanism which is suspended from the upper end of the mast by a windable wire, wound up by a winding machine, and lowered by its own weight.
In the former case, since the vehicle is lowered by applying a driving force, it is possible to excavate on a harder ground, and it is easy to control the excavation at a constant speed. On the other hand, the latter has the advantage that the configuration is simplified and the cost can be easily reduced.

Further, in the present invention, the holding mechanism is configured to hold the spiral blade portion of the auger screw from above and below.

Therefore , as compared with the case where the central axis of the auger screw is clamped, the clamping surface between the clamping mechanism and the auger screw is not parallel to the direction of the load applied to the auger screw, and the clamping mechanism is clamped. The auger screw can be securely clamped without excessive force. In addition, since a portion having a larger diameter is sandwiched, a load applied to the rotating mechanism in rotating the auger screw is reduced.

In the earth auger device of the present invention, since the auger screw is pinched and rotated at a low position, when an auger screw having an excessively long length is used, such as when a deep hole is to be excavated, the auger screw is located at a lower position than the pinching position. It may be difficult to stabilize the upper part.

[0013] It is, as in Claim 2, wherein the auger screw may be provided with a connecting-disconnecting universal coupling mechanism in the longitudinal direction of the predetermined position. With this configuration, the auger screw is cut off as several auger screw parts, first, only the lower end auger screw part is pinched and excavated, and the next auger screw part is connected when excavated to some extent. If you repeat the work, you can excavate while gradually extending the auger screw. In the present invention, since the driving force is not transmitted from the upper end portion of the auger screw as in the related art, the work can be easily added while the auger screw is not connected in advance. Therefore, it is not necessary to use an excessively long auger screw, and the center of gravity of the entire apparatus can be kept low even when a deep hole is excavated.

In particular, in the earth auger device according to the second aspect , as in the third aspect , the auger screw parts provided on the mast and separated by the coupling mechanism are respectively suspended and held. A holding mechanism;
It is convenient to provide a moving mechanism for moving the auger screw components held by the holding mechanism to respective axes on the rotation center of the rotation mechanism.

According to this earth auger device, the auger screw component held by the holding mechanism is moved by the moving mechanism to the axis of the rotation center of the rotating mechanism. Therefore, if the lower auger screw part is raised or the upper auger screw part is lowered, the connection can be easily made as it is. The lower auger screw part can be easily raised using a lifting mechanism.
Also, the holding mechanism may be configured to be able to descend, and if the upper and lower auger screw parts are not too far apart, the upper part may be dropped and connected. In addition,
The connection may be made such that the connection does not come off when a pin or the like is inserted.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, an earth auger device as an embodiment includes a mast 3 provided on a self-propelled construction machine 1 so as to be able to move up and down, and three auger screw parts 5a, 5b, 5c.
An auger screw 5 that is cut off, an auger drive 7 that moves up and down along the mast 3, and that is driven to rotate while holding the auger screw 5 by the rotating portion 7 a.
The auger screw parts 5
a to 5c, a screw holder 9 for suspending the auger screw parts 5a to 5c when the auger screw parts 5a to 5c are set in the screw holder 9, and an auger screw part 5a suspended by the arm 11 for lifting the auger screw parts. 5c is inserted, and the lower holder 13 vertically lifts the auger screw part.
And a movable cab 15 which can be moved to a position where the work situation can be easily monitored.

In these configurations, the mast 3 is supported and supported by the back stay cylinder 21, and is adjusted vertically by the back stay cylinder 21 and the slide cylinder 23. 3 auger screw parts 5a
5c have a length of about 10 meters in this embodiment, and are connected to form an auger screw 5 having a length of about 30 meters. Each of the auger screw parts 5a to 5c has a spiral blade 6 respectively. Auger screw parts 5a, 5b
As shown in FIG. 2, a hexagonal projection 31 formed at the upper end of the auger screw part 5a is fitted with a hexagonal hole 33 formed at the lower end of the auger screw part 5b, and the lock pin 35 is inserted into the lock hole 37. To be connected. The same applies to the auger screw parts 5b and 5c.

The auger drive 7 is, as shown in FIGS. 3 and 4, a motor gear 4 rotatably driven by a motor 41.
3, a rotating case 51 rotatably provided inside the housing 45 via a first bearing 47, and driven to rotate by meshing between a ring gear 49 and a motor gear 43 on an outer peripheral portion; The fixed shoe 53 is disposed so as to be vertically slidable along the inner peripheral surface of the rotating case 51.
Movable shoe 55 for clamping the blade 6 of the auger screw 5 in cooperation with the second bearing 57 to which the movable shoe 55 is fixed by bolts, and fixed between the second bearing 57 and the housing 45. And a hydraulic cylinder 59 that expands and contracts and presses the movable shoe 55. In addition,
The auger drive 7 also includes a pinion (not shown) that meshes with a rack (not shown) provided on the mast 3 shown in FIG. 1. By driving the pinion to rotate, the entire auger drive 7 moves up and down along the mast. I do.

The screw holder 9 has a semicircular frame 6 supported by three stays 61, as shown in FIG.
3 and three screw chucks 65 fixed to the frame 63. Each screw chuck 65 is arranged at a position where the center axis thereof coincides with the rotation axis of the rotating part 7 a of the auger drive 7 and the center axis of the lower holder 13 when the frame 63 is rotated about the mast 3. Has been established. As shown in FIG.
As shown in the figure, a holding mechanism 6 capable of holding the upper end portions of the auger screw parts 5a to 5c by the force of the hydraulic cylinder 67.
9 are provided.

As shown in FIG. 1, the arm 11 is attached to the uppermost part of the mast 3 and hooks each of the auger screw parts 5a to 5c lying on the ground by a hook 73 suspended by a wire 71. Can be lifted. The suspended auger screw component is inserted into the lower holder 13.

The lower holder 13 can stand only one auger screw part, and in this state, can be raised and lowered by hydraulic pressure to lift the auger screw part in the vertical direction. Therefore, by rotating the screw holder 9, an arbitrary screw chuck 65 is moved to a position coinciding with the center axis of the lower holder 13, and the auger screw component is raised to thereby remove the screw chuck 6.
5, the screw chuck 65 can hold the auger screw part, and if this operation is repeated in order, the three auger screw parts 5a to 5c become
All are suspended from the screw holder 9.

Next, the operation of the earth auger device of this embodiment will be described. First, when starting excavation,
By rotating the screw holder 9, the first auger screw part 5 a is moved on the rotation axis of the rotating part 7 a of the auger drive 7. Further, the auger drive 7 operates the movable shoe 55 shown in FIGS. 3 and 4 to widen the gap between the movable shoe 55 and the fixed shoe 53.

Then, the auger drive 7 is raised along the mast 3 while rotating the rotating case 51 counterclockwise at a rotation speed corresponding to the pitch of the blades 6 of the auger screw 5. As a result, the blade 6 of the auger screw part 5a enters the gap between the movable shoe 55 and the fixed shoe 53 of the auger drive 7, and the relationship between the bolts and the nuts is exactly established. It rises without being hindered by the blade 6 of the component 5a. When the auger drive 7 rises, the movable shoe 55 is operated to clamp the blade 6 of the auger screw component 5 a between the movable shoe 55 and the fixed shoe 53. As a result, the auger screw 5 becomes rotatable with the rotation case 51.

Next, the auger drive 7 is lowered along the mast 3 while rotating the rotating case 51 clockwise. As a result, the auger screw part 5a also descends while rotating, and excavation of the ground is started. When the auger screw part 5a is not held at the uppermost part, when the auger drive 7 is lowered to the lowermost position of the mast 3, the movable shoe 55 is operated again to move the movable shoe 55 and the fixed shoe. The auger drive 7 is raised along the mast 3 while rotating the rotating case 51 in a counterclockwise direction while widening the gap between the rotating case 51 and the rotating case 51, and the upper part of the auger screw part 5a is re-clamped. While rotating around, lower the auger drive 7 along the mast 3 and continue digging.

After digging to some extent by the first auger screw part 5a, the screw holder 9 is rotated to move the second auger screw part 5b on the rotation axis of the rotating part 7a of the auger drive 7. Then, the first auger screw part 5a and the second auger screw part 5b are connected by adjusting the positions of the blades 6 by the connection structure shown in FIG. At this time, if the auger screw parts 5a and 5b are separated from each other, the auger drive 7 is slightly raised to bring the upper end of the auger screw part 5a closer to the lower end of the auger screw part 5b. Is released and connected by its own weight. If a mechanism for lowering the screw holder 9 to some extent is provided, the auger screw component 5a does not need to be raised.

Next, the movable shoe 55 is operated to widen the gap between the movable shoe 55 and the fixed shoe 53, and the auger drive 7 is moved along the mast 3 while rotating the rotating case 51 counterclockwise. To raise. As a result, as in the case of the first auger screw, the auger drive 7 moves to the upper part of the second auger screw component 5b.

Hereinafter, the auger screw part 5
The excavation by the auger screw 5 is continued while holding the blade 6 of b, and the auger screw part 5c is connected in the same manner, so that excavation of a 30-meter class can be performed. As described above, according to the earth auger device of the present embodiment, the auger drive 7 can be driven by sandwiching the auger screw 5 at an arbitrary position. Since the height of 3 can be made lower than before, the center of gravity is lower than that of the conventional earth auger device. In addition, even if the auger drive 7 is not raised to the uppermost position of the mast 3 and digging while re-holding the auger screw 5 many times, work can be performed with a lower center of gravity.
Therefore, excavation work can be performed in a state where it is extremely difficult to fall down without any assistance particularly by a crane or the like. In the embodiment, even if the auger drive 7 is raised to the uppermost position of the mast 3, it can only be raised to a height of more than ten meters, but a deep hole of 30 meters can be excavated.

In this embodiment, the fixed shoe 53 and the movable shoe 55 hold the blade 6 of the auger screw 5 from above and below, so that the holding surface between the shoe and the auger screw is held. However, the auger screw 5 is not parallel to the direction of the load applied to the auger screw 5, and the auger screw 5 can be securely clamped without applying an excessive load to the hydraulic cylinder 59. Further, since the portion of the blade 6 having a larger diameter is sandwiched, the load on the motor 41 when the auger screw 5 is driven to rotate is reduced.

Further, since the auger screw 5 can be separated into three auger screw parts 5a to 5c and set in the auger drive 7 in order, the auger screw 5 can be dug while gradually extending, so that a long auger screw can be used. But you can drill deep holes.

Further, since the auger screw parts 5a to 5c are held by the screw holder 9 and can be sequentially moved on the axis of the rotating part 7a of the auger drive 7, the connection of the auger screw parts 5a to 5c is extremely easy. Can be. Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modes can be adopted without departing from the gist of the present invention.

For example, in the embodiment, the fixed shoe 53 and the movable shoe 55 are provided in the auger drive 7.
Another pair may be provided at a position opposite to 80 degrees. By doing so, the auger screw 5 can be more firmly held, and the balance when the rotating case 51 rotates is good.

Further, in the embodiment, the mast 3 and the auger drive 7 are configured to move up and down by the rack and the pinion. However, it is sufficient that the auger drive 7 can be moved up and down. For example, a wire winding machine that pulls the auger drive to the upper end of the mast by a wire may be provided so that when the wire is wound, the auger drive rises and the auger drive falls by its own weight. However, with the configuration of the embodiment, it is possible to excavate on a harder ground, and it is easier to control the excavation at a constant speed.

The mechanism for holding the auger screw 5 may have any structure as long as the auger screw can be held at an arbitrary position in the longitudinal direction. More specifically, for example, the rotation shaft of the auger screw may be held between the shoes.

[0034]

As described above, according to the earth auger apparatus of the present invention, the rotating mechanism for driving the auger screw, the clamping mechanism, and the elevating mechanism can be installed at low positions, so that the center of gravity is lower than that of the conventional earth auger apparatus. Become. Also, if the digging is performed while holding the auger screw again, the work can be performed with a lower center of gravity.

Further, since the portion of the spiral blade of O over moth screws from above and below to the structure for clamping, while reducing the load on the clamping mechanism and the rotation mechanism can reliably sandwich the auger screw. Furthermore, according to the earth auger device of claim 2 , since the auger screw can be connected and disconnected at a predetermined position in the longitudinal direction, the auger screw can be dug while gradually extending the auger screw, without using a long auger screw. Drill deep holes.

In addition, according to the earth auger device of the third aspect , when excavating while gradually extending the auger screw, the auger screw parts can be connected very easily.

[Brief description of the drawings]

FIG. 1 is a perspective view of a self-propelled construction machine provided with an earth auger device as an embodiment.

FIG. 2 is a perspective view showing a connection structure of auger screw parts.

FIG. 3 is a cross-sectional view showing a partially simplified internal structure of the auger drive.

FIG. 4 is an exploded perspective view showing a part of the internal structure of the auger drive.

FIG. 5 is a plan view showing an auger drive and a screw holder.

FIG. 6 is a cross-sectional view showing a simplified internal structure of the screw holder.

FIG. 7 is a side view showing a pile driver provided with a conventional earth auger device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Self-propelled construction machine, 3 ... Mast, 5 ... Auger screw, 5a, 5b, 5c ... Auger screw part, 6 ... Blade, 7 ... Auger drive, 7
a ... rotating part, 9 ... screw holder, 11 ...
・ Arm, 13 ・ ・ ・ Lower holder, 15 ・ ・ ・ Driver cab,
21 ... back stay cylinder, 23 ... slide cylinder, 31 ... hexagonal projection, 33 ... hexagonal hole, 3
5 ... lock pin, 37 ... lock hole, 41 ...
Motor, 43: Motor gear, 45: Housing, 47, 57: Bearing, 49: Ring gear, 51: Rotating case, 53: Fixed shoe,
55: movable shoe, 59, 67: hydraulic cylinder, 61: stay, 63: frame, 65 ...
.Screw chuck, 69... Holding mechanism, 71.
-Wire, 73 ... hook.

Claims (3)

(57) [Claims] 1. An auger screw having blades spirally wound around a long rotating shaft is vertically suspended along a vertically mast, and the auger screw is lowered while being driven to rotate. A grounding auger device for digging the ground vertically to form a hole for stakeout, etc., wherein the rotation mechanism is driven to rotate by a motor, and the auger screw is passed through the center of rotation, and the rotation mechanism is integrated with the rotation mechanism. A holding mechanism capable of holding the auger screw passed through the center of rotation at an arbitrary position in the longitudinal direction, and an elevating mechanism for moving the rotating mechanism and the holding mechanism up and down along a mast. And wherein the holding mechanism is a spiral blade of the auger screw.
An earth auger device characterized by sandwiching a portion from above and below . 2. The earth auger device according to claim 1 , wherein the auger screw has a connecting mechanism that can be connected and disconnected at a predetermined position in a longitudinal direction. 3. The earth auger device according to claim 2 , wherein a holding mechanism is provided on the mast and suspends and holds the auger screw parts separated by the connection mechanism, and is held by the holding mechanism. A moving mechanism for moving each of the auger screw components to the axis of the rotation center of the rotating mechanism.