JPH09158660A - Excavating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably connect a power swivel and a multishaft excavating pipe to each other without taking labor so much. SOLUTION: A turning angle positioning device 20 is arranged in a connection standby position of a multishaft excavating pipe 24, and a fitting position of a polygonal joint on the multishaft excavating pipe 24 side is previously positioned in a fitting position of a polygonal joint on the power swivel 12 side by this turning angle positioning device 20 or the like. After the positioning- completed multishaft excavating pipe 24 is carried under a power swivel 12 by a rod changer 18, the power swivel 12 is lowered, and the power swivel 12 and the multishaft excavating pipe 24 are connected to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator, and particularly to excavation in the ground by sequentially adding and rotating multiaxial drill pipes housed in a rod rack while giving rotation and feed to the polyaxial drill pipe with a power swivel. Related to the drilling equipment.

[0002]

2. Description of the Related Art The applicant of the present application discloses in Japanese Patent Laid-Open No. 5-118037.
In the publication, a plurality of short-length multi-axis drill pipes are housed in a rod rack, a leader frame having a power swivel attached to the rod rack is adjacent to the rod rack, and the multi-axis drill pipe is in a raised position. And a power swivel are connected to the excavating device at a position where the excavating device is conveyed to the lower side of the excavating device. According to this excavator, the height of the excavator can be lowered, so that stability and safety can be improved and deep excavation can be performed.

By the way, as a method of connecting a power swivel and a multi-axial drill pipe in an excavator, for example, a female shaft of a hexagonal joint is formed on the power swivel side and a male shaft of the hexagonal joint is formed on the multi-axial drill pipe side. Then, a method in which these hexagonal joints are fitted to each other and a pin is laterally inserted into the fitting portion to connect them, or as disclosed in Japanese Patent Publication No. 7-58032, an involute of a male and a female is disclosed. There is a method of connecting with a spline.

[0004]

However, in the excavator which connects the power swivel and the multi-axis drill pipe by fitting the hexagon joints, the pin insertion positions of the respective shafts are aligned and the hexagonal surfaces of the hexagon joints are also matched. Since it is necessary to align and it is not possible to connect if the rotational position is misaligned, in this case, it is necessary to rotate the power swivel or the multi-axis drill pipe to align the position, which is troublesome. There are drawbacks.

On the other hand, in the excavator in which the male and female involute splines are connected to each other, even if the irregularities between the involute splines are misaligned, the splines are finely formed in multiple lines, so that one involute spline is formed. If the involute splines are pushed into the other involute spline, the involute splines will be fitted to each other, so that there is an advantage that they can be connected without rotational alignment.

However, the involute spline joint has a high processing cost and has problems in durability and maintenance. The present invention has been made in view of such circumstances, and an object of the present invention is to provide an excavation device that can reliably connect a power swivel and a multi-axis drill pipe without trouble.

[0007]

In order to achieve the above object, the present invention sequentially conveys a plurality of multi-axis drill pipes accommodated in a rod rack below a power swivel, and a multi-axis on the power swivel side. An excavating device for excavating an underground wall by connecting a power swivel and a multiaxial drill pipe by fitting a polygonal joint formed on an output shaft and the polygonal joint formed on the multiaxial drill pipe side. In the connection standby position of the multi-axis drill pipe, the fitting position of the polygon joint on the multi-axis drill pipe side is pre-aligned with the fitting position of the polygon joint on the power swivel side, and the power is adjusted. It is characterized by connecting a swivel and a multi-axis drill pipe.

According to the present invention, the conventionally used hexagonal joint is used to connect the power swivel and the multi-axis drill pipe. In this case, if the fitting positions of the hexagonal joints of each axis are misaligned, there is a problem that they cannot be connected.Therefore, in order to eliminate this problem, at the connection standby position of the multiaxial drill pipe, After the fitting position of the hexagonal joint is previously aligned with the fitting position of the hexagonal joint on the power swivel side, the power swivel and the multiaxial drill pipe are connected. Therefore, in the present invention,
The power swivel and the multi-axis drill pipe can be reliably connected.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An excavating device according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a front view showing an embodiment of an excavation device 10 according to the present invention. The excavation device 10 mainly comprises a power swivel 12,
Leader 14, rod rack 16, rod changer 1
8 and a rotation angle alignment device 20.

The reader 14 is integrally constructed as a frame 17 and is erected on a base 22. Further, as shown in FIG. 2, a steady rest guide 22A is formed in the base 22, and passes through the steady rest guide 22A, and a triaxial excavating head 25 having a bit 23 at the tip thereof.
Is arranged. By applying rotation and feed to the excavation head 25, the underground is excavated to form an underground continuous wall.

Each shaft of the multi-axial drill pipe 24 in the rod rack 16 is rotatably bound by a connecting band 26, and an upper end of each shaft is an output shaft 28 of the power swivel 12.
(28, 28) is connected via a joint portion, and each lower end portion is connected to each upper end portion of the excavating head 25 having the bit 23 via a joint portion.
The rotation speeds of the output shafts 28, 28 ... Of the power swivel 12 are considered to be the same for simplification.

A hexagonal joint (polygonal joint) is adopted as the joint portion, and the hexagonal joints are connected to each other by fitting. The base 22
Since wheels 30, 30, ... Are attached to the excavator 10, the excavator 10 can move along rails 32, 32 laid on the ground. Reference numeral 34 is a hydraulic unit, and reference numeral 36 is an operator room.

On the other hand, the power swivel 12 is provided so that guide members 38, 38 provided on both sides thereof are slidably supported by the reader 14 and can be moved up and down along the reader 14. Reference numeral 40 shown in FIG. 1 is a winch,
The power swivel 12 is moved up and down by the winch 40. The rod rack 16 is, as shown in FIG.
It is arranged on the right side surface of the frame 17. Further, the rod rack 16 accommodates the relatively short multi-axis drill pipes 24, 24 ... At equal intervals by the drill pipe holding portions 42, 44. The upper digging pipe holding portion 42 is a beam that suspends and supports the multiaxial digging pipe 24 via the upper connecting band 26, and the lower digging pipe holding portion 44 is a multiaxial digging pipe 24.
Is a pin into which a female hexagonal joint formed in the lower part of is inserted.

As shown in FIG. 2, the rod changer 18 has a pair of transport rails 46, 46 arranged on both sides of the rod rack 16, and the transport rails 46, 46 are provided.
Shows the rod rack 16 to the frame 17 as shown in FIG.
Have been bridged over. In addition, the transport rails 46, 4
The left end of 6 is the power swivel 12 in the raised position.
Has been extended to below.

Rod carriers 48, 48 are provided on the transport rails 46, 46 so as to be movable via guides 50, 50. The rod carriers 48, 48 are driven by a driving force from a drive motor (not shown). Four
It reciprocates along 6,46. Further, the rod carrier 48 is connected to a rod 54 of a hydraulic cylinder 52 fixed to the guide 50, and is moved up and down along the guide 50 when the rod 54 expands and contracts.

By the way, the rotation angle alignment device 20 shown in FIG. 1 is provided at the connection standby position (terminal position) of the multiaxial drill pipe 24. In FIG. 3, the rotation angle alignment device 20 includes three hexagonal pins 56, 56, 5
6. The three hexagonal pins 56 to 56 are shown in FIG.
As shown in FIG. 3, the female hexagonal joints 58 formed in the lower portion of the multi-axial drilling pipe 24 are arranged in such a shape and at an interval that they fit. Gears 60 having the same specifications are fixed to the lower portions of the hexagonal pins 56. The gear 60 on the left side in FIG. 3 is meshed with the center gear 60 via two small diameter gears 62, 62 of the same specifications, and the center gear 60 is on the right side via one large diameter gear 64. It is meshed with the gear 60. Further, the left gear 60 is connected to a cylinder 68 via a rack gear 66. Therefore, when the driving force from the cylinder 68 is transmitted to the left gear 60 via the rack gear 66, the hexagonal pins 56, 5 are driven by the gear train described above.
6, 56 rotate simultaneously. At this time, the central hexagon pin 5
6 and the right hex pin 56 rotate in the same direction and the same angle, and the left hex pin 56 rotates in the opposite direction and the same angle. Further, the rotation ratio is the output shaft 2 of the power swivel 12.
It has the same relationship as the rotation ratio of 8, 28 ...

The rotation angle alignment device 20 is provided with, for example, a second sensor 70. The second sensor 70 is a rotation amount (for example, angle) of the hexagonal pin 56 (one place).
The information indicating the amount of rotation is detected by the angle indicator 72 (see FIG. 2) provided in the operator room 36 or in the frame 17.
It is displayed in (). The angle indicator 72 displays the rotation angle of the hexagonal pins 56 to 56 with respect to the reference position based on the above information. The rotation angle of the hexagonal pins 56 to 56 is adjusted by the operation of the cylinder 68 so as to match the stopped angle of the output shaft 28 from the reference position. Further, the angle indicator 72 has a first sensor 74 (see FIG. 2) for detecting the rotation amount of the output shaft 28 (one place) on the power swivel 12 side.
From, information indicating the rotation amount is displayed. The angle indicator 72 is based on the information from the first sensor 74,
The rotation angle of the female hexagonal joint formed on the output shafts 28, 28, 28 of the power swivel 12 with respect to the reference position is displayed.

Next, the excavator 10 constructed as described above.
A method of connecting the power swivel 12 and the multi-axis drill pipe 24 by the method will be described. First, the hexagonal fitting positions of the multi-axis drill pipes 24, 24 ... Stored in the rod rack 16 are aligned with the fitting positions of the hexagonal pins of the rotation angle alignment device 20. For example, assume that the fitting position in FIG. 5 is the reference position. As shown in FIG. 5, this reference position is a position where the connecting pin insertion surfaces 76, 76 ... Of the multi-axis drill pipe 24 are aligned. Then, the hexagonal pins 56 on the rotation angle alignment device 20 side
Similarly, 56 is the multi-axis drill pipe 24 located at the reference position.
The female hexagonal joints 58 to 58 are fitted to the positions (reference positions). Then, the first multi-axis drill pipe 24 to be connected is conveyed to the rotation angle alignment device 20 by the rod changer 18, and the female hexagonal joints 58 to 58 of the multi-axis drill pipe 24 are connected to the hexagonal pins 56 to 5.
It is made to stand by in the state fitted with 6 (refer to FIG. 1).

Next, the power swivel 12 is moved down to bring the output shafts 28 to 28 of the power swivel 12 closer to the excavation head 25, and the fitting position of the female hexagonal joint of the output shafts 28 to 28 is set to a predetermined angle. Stop inside (angle in this case close to the reference position). And the drilling head 2
5 male type hex joint 78-78 to output shaft 28-28
Rotate to the mating position with and align the hexagonal positions of the three axes.
The fitting position of the female hexagonal joint of the output shafts 28 to 28 at this time is the fitting position of the male hexagonal joint 80 of the multi-axial drill pipe 24, and the angle indicating the fitting position is the first sensor 74. Is detected by and displayed on the angle indicator 72.

The angle indicator 72 includes the first sensor 74.
The fitting position angle θ (see FIG. 6) of the female hexagonal joints of the output shafts 28, 28, 28 with respect to the reference position shown in FIG. 5 is displayed based on the angle detected in. Then, at this fitting position angle θ, the hexagonal joint 58 of the multi-axis drill pipe 24
The cylinder 68 of the rotation angle alignment device 20 is operated so that the fitting position angle of (80) matches, and the hexagon pin 5 is moved.
Rotate 6-56. The rotation angle of the hexagonal pins 56 to 56 is detected by the second sensor 70 at any time, and the cylinder 68 is stopped when the fitting angles match each other. As a result, at the terminal position, the first multi-axis drill pipe 2
4 is ready to be connected to the power swivel 12.

Upon completion of this alignment work, the power swivel 12 is raised to the connecting position with the multi-axial drill pipe 24, and then the first multi-axial drill pipe 24 is moved below the power swivel 12 by the rod changer 18. Transport to. Then, when the power swivel 12 is lowered, the fitting position of the female hexagonal joint on the power swivel 12 side is aligned with the fitting position of the male hexagonal joints 80 to 80 of the multiaxial drill pipe 24. The hexagonal joints fit smoothly without the joints interfering with each other. Therefore, in the present embodiment, the power swivel 12 and the multi-axis drill pipe 24 can be reliably connected to each other without any trouble.

When the output shaft 28 of the power swivel 12 and the multi-axial drill pipe 24 are connected, the annular sleeve 82 provided on the output shaft 28 is slid downward as shown in FIG. When the sleeve 82 moves downward, as shown in FIG. 8, the balls 86, 86, ... Arranged at a predetermined interval are provided on the peripheral surface of the female hexagonal joint 58 of the output shaft 28.
It is pushed by the inner peripheral surface of and is fitted into the groove 88 formed on the peripheral surface of the male hexagonal joint 80 of the multiaxial drill pipe 24. The ball 86 is movably held in holes 84 formed in the female hexagonal joint 58 of the output shaft 28.
As a result, the output shaft 28 and the multiaxial drill pipe 24 are connected to the ball 8
It is fixed through 6, 86 ... Since this connecting work is performed at a high place in the upper part, it is preferable to automatically connect the balls and the sleeve as described above in consideration of safety.

On the other hand, also in the work of connecting the multi-axis drill pipe 24 and the drill head 25, the rotational position of the female hexagonal joint 58 of the multi-axis drill pipe 24 and the hexagonal surface of the male hexagonal joint 78 of the drill head 25 are determined. Since the fitting positions match, the multi-axis drill pipe 24 and the drill head 25 can be easily connected. Then, as shown in FIG. 9, the connecting pin 90 is inserted into the through hole 89 of the fitting portion to securely lock the output shaft 28 and the multi-axial drill pipe 24. This connecting work can be performed at a lower place, and the inserting of the connecting pin 90 into the hole can be done manually.

When the connecting work is completed, the power swivel 1
2 is operated, and excavation is performed by the first multi-axis drill pipe 24. During this excavation work, if the rotation angle alignment device 20 makes the second multi-axis excavation pipe 24 stand by, the output shafts 28, 28, 28 of the power swivel 12 are fitted to each other at a predetermined position. Since the fitting position (angle) of the multi-axial digging pipe 24 can be set according to the (angle), the next connecting work of the multi-axial digging pipes 24 can be smoothly performed.

Thereafter, this work is repeated to successively add rods and excavate deeply. Further, at the time of recovery, the connecting pin 90 is stopped within a predetermined range (see FIG. 6) that does not hit the adjacent shaft and is pulled out to separate the multi-axis drill pipes 24 from each other, store them in the rod rack 16 and sequentially recover them. By the way, when the output shafts 28, 28, 28 of the power swivel 12 stop at the rotational position shown in FIG. 10, the connecting pin 90 hits the adjacent shaft, and the connecting pin 90 cannot be mounted from the connecting pin insertion surface 76. So I can't connect. Therefore, in such a case, the operator drives the power swivel 12 to stop the power swivel 12 at a position within a predetermined connectable range. In this case, it is preferable to stop the power swivel 12 within a range of usually ± 20 ° from the reference position.

Further, the sensors 70 and 7 for detecting the rotation amount.
As 4, a rotary encoder, a synchronous motor, a magnetic sensor, an optical sensor, an infrared sensor or the like can be used. The three output shafts 28 to 28 of the power swivel 12 of the present embodiment are the left output shaft 28 as shown in FIG.
Is right rotation, and the center and right output shafts 28, 28 are left rotation, but not limited to this, the left and right output shafts 28, 28 are right rotation, and the center output shaft 28 is left rotation. It can also be applied to the power swivel 12.

The rotation angle alignment device 20 is not limited to this embodiment, and may be provided for each rack row.

[0028]

As described above, according to the excavator according to the present invention, a polygonal joint such as a hexagon which has been conventionally used is adopted, and the multiaxial excavation is performed at the connection standby position of the multiaxial excavation pipe. The fitting position of the polygonal joint on the pipe side is pre-aligned with the fitting position of the polygonal joint on the power swivel side to connect the power swivel and the multi-axis drill pipe. The shaft excavation pipe can be surely connected without any trouble.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an excavating device according to the present invention.

FIG. 2 is a side view of the excavator shown in FIG.

FIG. 3 is a plan view of a rotation angle alignment device applied to an excavator.

4 is a vertical cross-sectional view of the rotation angle alignment device shown in FIG.

FIG. 5 is a plan view of a hexagonal joint of a multi-axis drill pipe located at a reference position.

FIG. 6 is a plan view of the hexagonal joint of the multi-axis drill pipe aligned with the rotational position of the hexagonal joint of the power swivel.

FIG. 7 is a vertical cross-sectional view showing a connecting portion between an output shaft of a power swivel and a multi-axial drill pipe.

FIG. 8 is a cross-sectional view showing a connecting portion between the output shaft of the power swivel and the multi-axial drill pipe.

FIG. 9 is a cross-sectional view showing a connecting portion between the output shaft of the power swivel and the multi-axis drill pipe.

FIG. 10 is a plan view of a hexagonal joint of a multiaxial drill pipe when rotation correction is required.

[Explanation of symbols]

 10 ... Excavation device 12 ... Power swivel 14 ... Leader 16 ... Rod rack 17 ... Frame 18 ... Rod changer 20 ... Rotation angle alignment device 24 ... Multi-axis drill pipe 70, 74 ... Sensor

Claims (1)

[Claims] 1. A plurality of multi-axis drill pipes housed in a rod rack are sequentially conveyed below a power swivel, and a polygonal joint formed on a multi-axis output shaft on the power swivel side and the multi-axis drill pipe side. In the excavation device for excavating the underground wall by connecting the power swivel and the multi-axial drill pipe by fitting the polygonal joint formed on the multi-axial drill pipe, An excavation characterized by preliminarily aligning a fitting position of a polygonal joint on the shaft excavating pipe side with a fitting position of the polygonal joint on the power swivel side to connect the power swivel and the multiaxial excavating pipe. apparatus.