JP2002097659A - Multishaft auger excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multishaft auger excavator capable also of preliminary excavation for removal of obstacles. SOLUTION: An outer shaft 62 is rotatably supported on the same axis as a center rotating shaft 32, among three rotating shafts 30, 32 and 34 arranged in a line. The three rotating shafts 30, 32 and 34 have respective gears 44, 46 and 48 mounted thereon, with the gears 44 and 46 of the rotating shafts 30 and 34 on both sides of the center rotating shaft 32 being engaged with the gear 46 of the center rotating shaft 32. A reduction gear 76 is provided which derives the outer shaft 62 by use of drive sources 50 and 52 at a speed lower than the speeds of the rotating shafts 30, 32 and 34. The reduction gear 76 uses a planetary reduction gear which transmits the rotation of the center rotating shaft 32 to the outer shaft 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-axis auger excavator used for forming a continuous wall and excavating by rotating three rotating shafts in a line.

[0002]

2. Description of the Related Art Conventionally, a multi-axis auger excavator has been used for forming a continuous wall. In a multi-axis auger excavator, a plurality of rotating shafts are arranged in a line, and an auger screw is mounted on each rotating shaft. , And excavation is performed by simultaneously rotating multiple auger screws. On the other hand, when there is an obstacle such as a hard ground stratum or a boulder in the ground at the construction site, the obstacle is removed by preceding digging, and a continuous wall is formed by a plurality of auger screws.

[0003]

In such a conventional apparatus, when removing an obstacle, a drilling tool for removing the obstacle is attached only to the central rotating shaft to perform pre-drilling. But,
Since the ground on which the continuous wall is formed is a soft stratum, the rotation axis of the multi-axis auger excavator is set to a relatively high rotation with emphasis on excavation efficiency. Therefore, excavation torque may be insufficient when removing obstacles.

[0004] In such a case, it is necessary to replace the excavator with a high torque output and perform pre-drilling, which necessitates re-assembly work, and also requires a plurality of excavators.
There was a problem that the burden of work and equipment was large. An object of the present invention is to provide a multi-axis auger excavator that can also perform pre-drilling for obstacle removal.

[0005]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, in a multi-axis auger excavator in which three rotating shafts are arranged in a line and are rotatably supported, and the three rotating shafts are rotated by a driving source, an outer shaft is coaxial with the central rotating shaft. A multi-axis auger excavator is provided, which is rotatably supported and provided with a speed reducer for driving the outer shaft at a lower speed than the rotation shaft by the driving source.

A gear is attached to each of the three rotating shafts, and a gear of the central rotating shaft is meshed with a gear of the rotating shaft on both sides thereof. The rotation may be transmitted to the outer shaft. Further, the speed reducer may be configured to transmit the rotation of the central rotating shaft to the outer shaft. Or
The reduction gear may transmit rotation of the rotation shafts on both outer sides to the outer shaft. Further, the speed reducer may be a gear in which a gear attached to an output shaft of the drive source and a gear attached to the outer shaft are meshed.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1 and FIG.
Is a self-propelled pile driver, in which a leader 2 is supported by a stay 4 and a catching hawk 6 so as to be able to move up and down. A pair of elongated guide rails 8 are laid on the front surface of the reader 2 along the longitudinal direction. On the guide rail 8,
A multi-axis auger excavator 12 is slidably mounted via a plurality of guide gibs 10. Multi-axis auger excavator 12
Has a plurality of auger screws 14 attached thereto.

[0008] A winch 20 is mounted on the pile driver 1, and a wire 22 drawn out of the winch 20 is drawn out along the leader 2, and a sheave 24 rotatably supported in the middle of the leader 2. Via a sheave 26 rotatably supported at the upper end of the reader 2.

Further, after the wire 22 is wound around a sheave 28 provided at the upper end of the reader 2, a multi-axis auger excavator 12 is suspended from the wire 22, and one end of the excavator 12 is connected to the upper end of the reader 2. It is closed to. Not only the winch 20 but also a pinion meshed with a rack laid on the reader 2 along the guide rail 8 is rotated by a motor provided on the multi-axis auger excavator 12 to rotate the pinion.
May be configured to move up and down.

The above-described multi-axis auger excavator 12 is shown in FIG.
As shown in FIG. 7A, three rotation shafts 30, 32, 3
4 are arranged in a line, and are rotatably supported by the machine casing 36 via bearings 38 to 43. Each rotating shaft 30, 3
Gears 44, 46 and 48 are integrally attached to the gears 2 and 34, respectively, and the gears 46 and 48 of the outer rotating shafts 30 and 34 mesh with the gear 46 of the central rotating shaft 32. . Each of the gears 44, 46, 48 has the same number of teeth.
Rotates at the same speed in the opposite direction.

The number of teeth of each of the gears 44, 46, 48 is not limited to the same, and the number of teeth may be changed so that the rotation shafts 30,
4, the case where the central rotating shaft 32 rotates at a higher speed, and conversely, the case where the outer rotating shafts 30 and 34 rotate at a higher speed than the central rotating shaft 32. Is also good.

The machine frame 36 includes two drive sources 50,
A drive 52 is attached, and each of the drive sources 50 and 52 includes motors 50a and 52a and reduction gear units 50b and 52b, respectively. Gears 58, 60 are integrally attached to output shafts 54, 56 of both drive sources 50, 52, respectively. The two gears 58 and 60 are respectively provided on both outer rotating shafts 3.
0 and 34 are meshed with the gears 44 and 48.

On the other hand, a hollow outer shaft 62 arranged coaxially with the central rotary shaft 32 has a pair of bearings 64, 6
6 rotatably supported. A sun gear 68 is integrally provided on the rotating shaft 32, and an internal gear 70 is integrally provided on the machine frame 36 so as to face the sun gear 68. The bearing 41 described above is used for the outer shaft 6.
2 and the rotation shaft 32.

Between the sun gear 68 and the internal gear 70,
A plurality of meshed planetary gears 72 are arranged, and each of the planetary gears 72 is rotatably supported on the outer shaft 62 via a pin 74. In the present embodiment, the sun gear 6
8, a reduction gear 76 composed of a planetary reduction gear is constituted by the internal gear 70 and the planetary gear 72. The speed reducer 76 is configured to reduce the rotation of the rotation shaft 32 and transmit the rotation to the outer shaft 62.

Next, the operation of the multi-axis auger excavator 12 of the above-described embodiment will be described. First, when forming a continuous wall, as shown in FIGS.
The auger screws 14 are connected to 0, 32, and 34, respectively. Then, the drive sources 50 and 52 are driven to rotate the rotation shafts 30, 32 and 34 via the output shafts 54 and 56 and the gears 44, 46, 48, 58 and 60, thereby rotating the auger screw 14. Excavation is performed by lowering the multi-axis auger excavator 12 along the guide rail 8.

When the excavation at one place is completed, the multi-axis auger excavator 12 is raised, the auger screw 14 is pulled out, and then the pile driver 1 is moved so that the excavation hole is connected, and again. Excavation is performed by the auger screw 14. This is repeated to form a continuous wall.

On the other hand, when there is an obstacle such as a hard ground stratum or a boulder in the ground and it is impossible to excavate with the auger screw 14, a casing 80 having an excavation bit at the tip is replaced with the auger screw 14 as shown in FIG. And a screw 82 inserted into the casing 80. The casing 80 is connected to the outer shaft 62, and at this time, a coupling or the like (not shown) may be used. The screw 82
Is connected to the central rotating shaft 32.

Then, as described above, both driving sources 5
0, 52, and output shafts 54, 56, gears 44, 4
6, 48, 58, 60, the rotation shafts 30, 32, 34
To rotate. The rotation of the central rotation shaft 30 causes the reduction gear 7
The outer shaft 62 rotates at a lower speed than the rotation shaft 30 via the rotation shaft 6.

Therefore, the casing 80 is controlled by the outer shaft 62.
Is driven to rotate with high torque, and the central rotating shaft 3
2 is rotated. Accordingly, an underground obstacle is excavated by the casing 80, and the earth and sand in the casing 80 is excavated by the screw 82 and discharged to the outside.
In this way, by digging in advance using the casing 80, obstacles such as a hard ground stratum and a boulder can be excavated.
After removing the obstacle, the auger screw 14 is replaced and the continuous wall is constructed in the same manner as described above.

Next, a description will be given of a speed reducer according to a second embodiment in which the configuration of the multi-axis auger excavator 12 and the speed reducer 76 are different from each other with reference to FIGS. 4 and 7 (2). Note that the same members as those in the above-described embodiment are denoted by the same reference numerals, and detailed description is omitted. The same applies hereinafter.

In the speed reducer 100 of the second embodiment, the sun gear 68 is formed integrally with the central rotary shaft 32, and the internal gear 102 facing the sun gear 68 is the inner race of the bearing 104, as described above. And are formed integrally. Bearing 104
Is mounted on the machine frame 36, and the outer shaft 106 is integrally mounted on the internal gear 102.

The planetary gear 108 meshes with the sun gear 68 and the internal gear 102, and is rotatably supported by the machine frame 36 via a pin 110. Also in this case, as described above, when the sun gear 68 rotates, the internal gear 102
, The outer shaft 106 is rotationally driven at a lower speed than the rotating shaft 32. By using the planetary reducer, a large reduction ratio can be easily obtained.

A third embodiment having a different speed reducer will be described with reference to FIGS. 5 and 7 (3). In the speed reducer 120 according to the third embodiment, one large gear 126 is meshed with gears 122 and 124 integrally formed on both outer rotation shafts 30 and 34, and the large gear 126 is a bearing 128.
Are formed integrally with the inner ring.

The outer ring of the bearing 128 is attached to the machine frame 36, and the outer gear 130 is integrally attached to the large gear 126. When the driving sources 50 and 52 are driven to rotate the rotating shafts 30 and 34, the outer shaft 130 is rotated via the gears 122 and 124 and the large gear 126 to rotate the rotating shafts 30, 32 and 3.
It rotates at a lower speed than 4.

Further, a fourth embodiment having a different speed reducer will be described with reference to FIGS. FIG. 6 is a sectional view taken along the line AA in FIG. In the speed reducer 140 of the fourth embodiment, gears 142 and 144 are integrally attached to output shafts 54 and 56 of the drive sources 50 and 52, and a large gear 146 is meshed with both gears 142 and 144.
The large gear 146 is arranged coaxially with the central rotation shaft 32.

The large gear 146 is formed integrally with the outer ring of the bearing 148, and the inner ring of the bearing 148 is
Attached to. The large gear 146 has an outer shaft 150.
Are attached integrally. The driving sources 50 and 52 are driven to rotate the respective rotating shafts 30, 32 and 34, and the output shafts 54 and 56, the gears 142 and 144, the large gear 1
The outer shaft 150 rotates at a lower speed than the rotation shaft 32 via 46.

The present invention is not limited to such an embodiment at all, and can be implemented in various modes without departing from the gist of the present invention.

[0028]

As described above in detail, in the multi-axis auger excavator of the present invention, since the outer shaft is driven to rotate with a high torque, a plurality of auger screws can be connected to form a continuous wall. In the case where there is an obstacle, there is an effect that the drill can be connected to the outer shaft and the obstacle can be removed by preceding digging. Therefore, a continuous wall can be formed and obstacles can be removed with a single multi-axis auger excavator, so that the rearrangement operation is easy and a plurality of excavators are not required.

[Brief description of the drawings]

FIG. 1 is a front view of a pile driver equipped with a multi-axis auger excavator as one embodiment of the present invention.

FIG. 2 is a side view of a pile driver on which the multi-axis auger excavator of the present embodiment is mounted.

FIG. 3 is an enlarged sectional view of a main part of the multi-axis auger excavator of the embodiment.

FIG. 4 is an enlarged sectional view of a main part of a multi-axis auger excavator according to a second embodiment.

FIG. 5 is an enlarged sectional view of a main part of a multi-axis auger excavator according to a third embodiment.

FIG. 6 is an enlarged sectional view of a main part of a multi-axis auger excavator according to a fourth embodiment.

FIG. 7 is an explanatory diagram showing a gear arrangement of the speed reducer of each embodiment.

FIG. 8 is a front view of the multi-axis auger excavator of the present embodiment in which an excavator for removing an obstacle is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Piling machine 2 ... Leader 8 ... Guide rail 12 ... Multi-axis auger excavator 14 ... Auger screw 30, 32, 34 ... Rotating shaft 36 ... Machine frame 50, 52 ... Drive source 62, 106, 130, 150 ... Outside Shaft 68 Sun gear 70, 102 Internal gear 72108 Planetary gear 76, 100, 120, 140 Reducer 80 Casing 82 Screw

Claims (5)

[Claims] 1. A multi-axis auger excavator in which three rotating shafts are arranged in a line and are rotatably supported, and the three rotating shafts are rotated by a drive source, wherein the rotary shaft is coaxial with a central rotating shaft. A multi-shaft auger excavator, further comprising a speed reducer that rotatably supports an outer shaft and drives the outer shaft at a lower speed than the rotation shaft by the driving source. 2. A gear is attached to each of the three rotating shafts, and a gear of the rotating shaft at the center is meshed with a gear of the rotating shaft on both sides thereof. The multi-shaft auger excavator according to claim 1, wherein any one of the rotations is transmitted to the outer shaft. 3. The multi-shaft auger excavator according to claim 2, wherein the speed reducer transmits the rotation of the central rotating shaft to the outer shaft. 4. The multi-shaft auger excavator according to claim 2, wherein the speed reducer transmits rotation of the rotating shafts on both outer sides to the outer shaft. 5. The multi-shaft according to claim 1, wherein the speed reducer is configured by meshing a gear attached to an output shaft of the drive source with a gear attached to the outer shaft. Auger excavator.