JPH07238765A - Earth auger device - Google Patents

Abstract

PURPOSE:To provide an earth auger device which is capable of excavating in a low center of gravity, and what is more, in a working state which is protected against a fall down. CONSTITUTION:An earth auger device is provided with a mast 3, which is installed to self-propelled construction equipment in such a fashion that it may be erected freely, and an auger screw 5, which are cut off into three auger screw components 5a, 5b and 5c, an auger drive 7, which rises along the mast 3 and clamps the auger screw 5 with a rotary part 7a and makes a rotary drive and a screw holder 9 which is installed rotatively about the mast as its axis and suspends each of the auger screws 5a to 5c or the like. Since the auger drive 7 drives rotatively, clamping the auger screw at an arbitrary position, it can be installed at a low position. If the auger drive 7 attempts excavation, clamping anew the auger screw many times, excavation work can be carried out in a lower center of gravity.

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 for vertically excavating the ground to form holes for pile driving.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, an earth auger device provided in a large pile driving machine or the like used on a construction site is provided on a pile driving machine 101 so that it can be erected up and down vertically during the work. A mast 103 to be installed, and an auger screw 105 having blades spirally wound around a long rotating shaft,
It is equipped with an auger drive 107 that drives the auger screw 105 to rotate, and a wire 109 that suspends the auger screw 105 and the auger drive 107. It was dug into and formed holes for pile driving.

[0003]

However, according to the prior art, the auger drive 107 has a weight of about 15 tons when it is large, and the mast 103 is
When it became taller, it was about 33 meters high. Therefore, when the auger drive 107 is raised to the top with the mast 103 standing vertically, the mast 10
There is a problem that the pile driver 101 is in an unstable state in which the pile driver 101 tends to fall down because the upper weight of 3 becomes heavy and the position of the center of gravity is high.

To cope with such a problem, conventionally, a crane or the like is prepared separately from the pile driver 101, and an auger screw is hung by the crane to assist the pile driver 101 not to fall. . However, preparing a crane, performing the necessary connection work, and operating the pile driver and the crane respectively are both labor-intensive and physical-intensive, and the position of the center of gravity is high. It did not mean that the stable condition was fundamentally resolved.

Therefore, an object of the present invention is to provide an earth auger device having a low center of gravity and capable of working in a state where it is extremely hard to fall down.

[0006]

In order to achieve the above-mentioned object, the present invention has a blade spirally wound on a long rotary shaft along a vertically arranged mast. In an earth auger device that vertically installs an auger screw, lowers it while rotating it, and vertically excavates the ground to form holes for pile driving etc. A rotation mechanism through which the auger screw is passed through the center, a holding mechanism that is rotatably disposed integrally with the rotation mechanism, and that can hold the auger screw passed through the rotation center at any position in the longitudinal direction, An elevating mechanism for elevating the rotating mechanism and the sandwiching mechanism along a mast is provided.

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, rotates together with the rotating mechanism to give a rotating force to the auger screw, and the rotating mechanism is rotated by the elevating mechanism. The mechanism and the clamping mechanism are moved up and down along the mast, and the auger screw excavates and the auger screw is pulled out. That is,
The driving force is transmitted to the auger screw at an arbitrary position in the longitudinal direction to rotate the auger screw. Therefore, the drive mechanism including the relatively heavy rotating mechanism, the sandwiching mechanism, and the lifting mechanism can be arranged, for example, at a position half the length of the auger screw, or even at a position lower than that, and the device can be configured as a whole. Become a low center of gravity.

When the auger screw is clamped in the low position,
When digging, it becomes impossible to dig before the auger screw completely enters the ground, but at that time, the clamping mechanism is released and the elevating mechanism raises the drive mechanism to re-clamp the upper part of the auger screw. Repeat the work of digging. In this way, if the elevating mechanism is configured to repeatedly move up and down little by little to advance, the mast to which the elevating mechanism is attached can be lowered, and the center of gravity is further lowered.

The elevating mechanism referred to here is a mechanism for elevating and lowering by using a driving force, such as a mechanism for elevating and lowering by driving a pinion that engages with a rack provided on a mast, or a mechanism for using a driving force when ascending. May be a mechanism that allows the wire to be wound under its own weight, for example, a mechanism in which it is suspended from the upper end of the mast by a windable wire, the wire is wound up by a winder and lifted, and then lowered by its own weight.
In the former case, the driving force is applied to lower the ground, so that the harder ground can be excavated, and it is also easy to control so as to advance at a constant speed. On the other hand, the latter has the advantages that the configuration is simple and cost reduction is easy.

Incidentally, the holding mechanism may have any structure as long as the auger screw can be held at any position in the longitudinal direction. More specifically, a method of sandwiching the rotating shaft of the auger screw may be considered, but in particular, when the sandwiching mechanism sandwiches the spiral blade portion of the auger screw from above and below according to claim 2. desirable.

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

In the earth auger device of the present invention, since the auger screw is clamped and rotated at a low position, if an auger screw having an excessively long length is used when a deep hole is to be excavated, the auger screw is more likely than the clamped position. It may be difficult to stabilize the upper part.

According to a third aspect of the present invention, the auger screw may be provided with a connecting mechanism that can be connected / disconnected at a predetermined position in the longitudinal direction. If configured in this way, the auger screw is separated as some auger screw parts, first, only the auger screw part at the lower end is sandwiched and excavated, and after a certain amount of excavation, the next auger screw part is connected. If you repeat the work, you can dig while extending the auger screw gradually. In the present invention, unlike the prior art, since the driving force is not transmitted from the upper end portion of the auger screw, even if the auger screw is not connected in advance,
You can easily work while adding more. Therefore, it is not necessary to use an excessively long auger screw,
The center of gravity of the entire device can be kept low even when drilling deep holes.

Particularly, in the earth auger device according to the third aspect of the invention, further, as described in the fourth aspect, the auger screw parts provided on the upper part of the mast and separated by the connecting mechanism are respectively suspended and held. A holding mechanism,
It is convenient to provide a moving mechanism that moves the auger screw components held by the holding mechanism to the axis of the rotation center of the rotating mechanism.

According to this earth auger device, the auger screw component held by the holding mechanism is moved by the moving mechanism onto the axis of the rotation center of the rotating mechanism. Therefore, if the lower auger screw component is raised or the upper auger screw component is lowered, the connection can be easily performed as it is. The lower auger screw part can be easily raised by using the lifting mechanism.
Further, 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,
Regarding the connecting portion, it is sufficient to prevent the connection from being removed by inserting a pin or the like.

[0016]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 1, an earth auger device as an embodiment includes a mast 3 which is provided on a self-propelled construction machine 1 so as to be up and down, and three auger screw parts 5a, 5b, 5c.
The auger screw 5 separated from the mast 3, and the auger drive 7 that moves up and down along the mast 3 and that drives the auger screw 5 to be rotatably held by the rotating portion 7a.
Each auger screw part 5 is rotatably provided around the
a-5c, a screw holder 9 for suspending a to 5c, an arm 11 for suspending each auger screw component when setting each auger screw component 5a to 5c in the screw holder 9, and an auger screw component 5a suspended by the arm 11. Lower holder 13 into which ~ 5c is inserted and which lifts the auger screw part in the vertical direction
And a mobile cab 15 that can be moved to a position where the work status can be easily monitored.

Of these components, the mast 3 is supported by the backstay cylinder 21 and is erected, and is vertically adjusted by the backstay cylinder 21 and the slide cylinder 23. 3 auger screw parts 5a
˜5c each have a length of about 10 meters in this example, and by connecting them, an auger screw 5 having a length of about 30 meters is formed. Each of the auger screw components 5a to 5c has a spiral blade 6. Auger screw parts 5a, 5b
2, the hexagonal protrusion 31 formed at the upper end of the auger screw component 5a and the hexagonal hole 33 formed at the lower end of the auger screw component 5b are fitted to each other, and the lock pin 35 is locked in the lock hole 37. Is inserted and connected. The same applies to the auger screw parts 5b and 5c.

As shown in FIGS. 3 and 4, the auger drive 7 is a motor gear 4 which is rotationally driven by a motor 41.
3, a rotary case 51 that is rotatably provided inside the housing 45 via a first bearing 47, and is rotationally driven by the engagement of the ring gear 49 and the motor gear 43 at the outer peripheral portion, and a bolt inside the rotary case 51. The fixed shoe 53 fixed to the fixed shoe 53 and the fixed shoe 53 are arranged so as to be vertically slidable along the inner peripheral surface of the rotating case 51.
The movable shoe 55 that holds the blades 6 of the auger screw 5 in cooperation with the second bearing 57, which is fixed to the movable shoe 55 with bolts, and the second bearing 57 and the housing 45. And a hydraulic cylinder 59 that expands and contracts to press 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 rotating the pinion, the entire auger drive 7 moves up and down along the mast. To do.

As shown in FIG. 5, the screw holder 9 is a semicircular frame 6 supported by three stays 61.
3 and three screw chucks 65 fixed to the frame 63. Each screw chuck 65 is arranged at a position where its central axis coincides with the rotational axis of the rotating portion 7a of the auger drive 7 and the central axis of the lower holder 13 when the frame 63 is rotated about the mast 3. It is set up. As shown in FIG.
As shown in FIG. 6, a holding mechanism 6 capable of holding the upper end portions of the auger screw parts 5 a to 5 c by the force of the hydraulic cylinder 67.
9 is provided.

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

The lower holder 13 can stand only one auger screw component, and in that state, it can be moved up and down by hydraulic pressure to lift the auger screw component in the vertical direction. Therefore, by rotating the screw holder 9, an arbitrary screw chuck 65 is moved to a position that coincides with the central axis of the lower holder 13, and the auger screw component is raised to move the screw chuck 6
5, the screw chuck 65 can hold the auger screw parts, and if this operation is repeated in order, the three auger screw parts 5a to 5c become
All are suspended on the screw holder 9.

Next, the operation of the earth auger device of this embodiment will be described. First of all, when starting excavation,
The screw holder 9 is rotated to move the first auger screw component 5a onto the rotation axis of the rotating portion 7a 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 component 5a enters into the gap between the movable shoe 55 and the fixed shoe 53 of the auger drive 7 and becomes like a relationship between a bolt and a nut. Ascending without being hindered by the blades 6 of the component 5a. When the auger drive 7 is lifted, the movable shoe 55 is operated to hold the blade 6 of the auger screw component 5a between it and the fixed shoe 53. As a result, the auger screw 5 can rotate along with the rotating case 51.

Next, the auger drive 7 is lowered along the mast 3 while rotating the rotating case 51 clockwise this time. As a result, the auger screw component 5a also rotates and descends to start excavation of the ground. If the auger screw component 5a is not clamped at its uppermost portion, when the auger drive 7 descends to the lowermost position of the mast 3, the movable shoe 55 is actuated again to move the movable shoe 55 and the fixed shoe. While widening the gap with 53 and rotating the rotating case 51 counterclockwise, the auger drive 7 is raised along the mast 3 and the upper part of the auger screw component 5a is clamped again. While rotating around, the auger drive 7 is lowered along the mast 3 to continue the excavation.

After the first auger screw component 5a has been dug to some extent, the screw holder 9 is then rotated to move the second auger screw component 5b on the rotation axis of the rotating portion 7a of the auger drive 7. Then, the first auger screw component 5a and the second auger screw component 5b are connected by aligning the positions of the blades 6 by the connecting 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, and when the connecting angles are correct, the screw holder 9 Release the holding by and connect it by its own weight. Note that the auger screw component 5a does not have to be raised if a mechanism for lowering the screw holder 9 is provided to some extent.

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, the auger drive 7 moves to the upper part of the second auger screw component 5b, as in the case of the first one.

Thereafter, the auger screw component 5 is similarly processed.
By sandwiching the blade 6 of b and continuing the excavation by the auger screw 5, the auger screw component 5c is also similarly connected to enable excavation of 30 meters. As described above, according to the earth auger device of the present embodiment, the auger drive 7 can drive the auger screw 5 by sandwiching the auger screw 5 at an arbitrary position, so that the auger drive 7 can be installed at a low position, and accordingly, the mast must be installed. Since the height of 3 can be made lower than the conventional one, the center of gravity becomes lower than that of the conventional earth auger device. Moreover, even if the auger drive 7 is not raised to the uppermost position of the mast 3, if the auger screw 5 is repeatedly pinched and advanced, the work can be performed with a lower center of gravity.
Therefore, excavation work can be performed in a state in which it is extremely difficult to fall down without being assisted by a crane or the like. In addition, in the embodiment, even if the auger drive 7 is raised to the uppermost position of the mast 3, the height of the auger drive 7 rises to only 10 meters or more, but a deep hole of 30 meters class can be drilled.

Further, in this embodiment, since the fixed type shoe 53 and the movable type shoe 55 sandwich the blade 6 of the auger screw 5 from above and below, the sandwiching surface between the shoe and the auger screw is formed. 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 reliably clamped without applying an excessive load to the hydraulic cylinder 59. Further, since the blade 6 having a larger diameter is sandwiched, the load applied to the motor 41 when the auger screw 5 is rotationally driven is also 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 gradually extended and excavated without using a long auger screw. But you can drill deep holes.

Further, since the auger screw parts 5a to 5c are held by the screw holder 9 so that they can be sequentially moved on the axis of the rotating portion 7a of the auger drive 7, the auger screw parts 5a to 5c can be connected very easily. You can 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 scope of the present invention.

For example, in the embodiment, the auger drive 7 is provided with one set of the fixed type shoe 53 and the movable type shoe 55. However, the fixed type shoe 53 and the movable type shoe 55 are the same.
Another set may be provided on the opposite side of 80 degrees. By doing so, the auger screw 5 can be held more firmly, and the balance when the rotating case 51 rotates is good.

In the embodiment, the mast 3 and the auger drive 7 are moved up and down by the rack and the pinion, but it is sufficient that the auger drive 7 can be moved up and down. For example, a wire winder for pulling the auger drive to the upper end of the mast by a wire may be provided so that the auger drive moves up when the wire is wound and the auger drive moves down due to its own weight. However, with the configuration of the embodiment, it is possible to excavate harder ground, and it is easier to control so that the excavation proceeds 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 any position in the longitudinal direction. More specifically, for example, the rotating shaft of the auger screw may be sandwiched by the shoes.

[0034]

As described above, according to the earth auger device of the present invention, the rotating mechanism for driving the auger screw, the clamping mechanism, and the elevating mechanism can be installed at a low position, so that the center of gravity is lower than that of the conventional earth auger device. Become. In addition, if the auger screw is clamped again and advanced, the work can be performed with a lower center of gravity.

Further, according to the earth auger device of the second aspect, since the spiral blade portion of the auger screw is sandwiched from above and below, the load applied to the sandwiching mechanism and the rotating mechanism can be reduced while ensuring reliability. The auger screw can be clamped to. Further, according to the earth auger device of the third aspect, since the auger screw can be connected / disconnected at a predetermined position in the longitudinal direction, the auger screw can be gradually advanced while excavating, and a long auger screw is not used. Can drill deep holes.

In addition, according to the earth auger device of the fourth aspect, it is possible to connect the auger screw parts very easily when excavating while gradually extending the auger screw.

[Brief description of drawings]

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

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 a perspective view showing an exploded 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 a screw holder.

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

[Explanation of symbols]

1 ... Self-propelled construction machine, 3 ... Mast, 5 ... Auger screw, 5a, 5b, 5c ... Auger screw parts, 6 ... Blade, 7 ... Auger drive, 7
a ... rotating part, 9 ... screw holder, 11 ...
・ Arm, 13 ... Lower holder, 15 ... Operator's cab,
21 ... back stay cylinder, 23 ... slide cylinder, 31 ... hexagonal protrusion, 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 (4)

[Claims] 1. An auger screw having blades spirally wound around a long rotating shaft is vertically installed along a vertically standing mast, and the auger screw descends while rotationally driving the auger screw. In the earth auger device that vertically excavates the ground to form a hole for pile driving, etc., a rotation mechanism that is driven to rotate by a motor and the auger screw passes through the rotation center, and the rotation mechanism is integrated with the rotation mechanism. A gripping mechanism that is rotatably disposed in the shaft and that can clamp the auger screw passed through the center of rotation at an arbitrary position in the longitudinal direction; and a lifting mechanism that lifts and lowers the rotation mechanism and the gripping mechanism along a mast. An earth auger device characterized by that. 2. The earth auger device according to claim 1, wherein the holding mechanism holds a portion of the spiral blade of the auger screw from above and below. 3. The earth auger device according to claim 1 or 2, wherein the auger screw includes a connecting mechanism that is connectable / disconnectable at a predetermined position in the longitudinal direction. 4. The earth auger device according to claim 3, wherein a holding mechanism that is provided on the mast upper part and that suspends and holds the auger screw parts separated by the connecting mechanism, and is held by the holding mechanism. An earth auger device comprising: a moving mechanism that moves each of the auger screw parts to an axis of a rotation center of the rotating mechanism.