JP3022768U - Boring rod screw unwinding device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a boring rod screw unwinding device capable of safely and surely unthreading a threaded joint portion of a boring rod, improving screw unwinding work efficiency, and saving labor. [Structure] The lower boring rod 3 is firmly held by a hydraulic chuck device 5, and the upper boring rod 2 screwed with the lower boring rod 3 is fixed to a rod clamp device 6.
The spindle 4 which is held by the eccentric piece 17 and is connected to the lower boring rod 3 via the wedge member 37 is rotated. As a result, the eccentric piece 17 moves along the piece guide pin 16, and accordingly, the upper boring rod 2 rises while being unscrewed. As described above, the screw connection portion is unscrewed. After that, by repeating the same operation,
A large number of boring rods screwed together are collected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a boring rod screw unwinding device suitable for easily releasing a screw connection portion of a boring rod for excavating the ground etc. by dividing the boring rod into the ground surface side for recovery.

[0002]

[Prior art]

 Drilling works such as geological surveys, ore deposit exploration, water well drilling, grout injection hole drilling, cast-in-place hole drilling, etc. are carried out by boring with a boring rod such as a drilling machine. Specifically, it is general to drill a deep hole by connecting a plurality of elongated and long boring rods one after another by threaded connections. On the other hand, it is necessary to pull up the boring rod when the excavation is completed or when the core barrel containing the drill bit and the geological sample is collected from the bottom of the hole to collect the core on the ground. In this case, it is difficult to pull up the entire boring rod while it is still screwed, so it is necessary to release the screw joints of the upper and lower boring rods, disassemble and recover.

Conventionally, the screw joints of the upper and lower boring rods have been released exclusively by human power. That is, two pipe wrenches are used, one of the pipe wrenches holds the lower boring rod, for example, and holds the base end of the boring rod on the stationary side of the drilling machine, and the other pipe wrench holds the upper boring rod. The screw is unwound by manually turning it.

[0004]

[Problems to be solved by the device]

 Generally, the threaded joints of the upper and lower boring rods are tightened. Therefore, unwinding requires a very large torque and often exceeds the limit of human power. Therefore, a means for inserting an auxiliary pipe into the other pipe wrench and lengthening the lever length to increase the rotation torque to unscrew the screw is adopted. However, there is a problem that the auxiliary pipe may come out of the pipe wrench, and a worker who exerts his own strength may cause an accident. Therefore, instead of manual screw unwinding, a means to untwist the screw by using a hydraulic chuck, a hydraulic holder, a reversing mechanism of a boring machine, etc. can be considered. However, this means has a problem that the equipment structure becomes large and the equipment cost becomes high.

The present invention solves the above-mentioned problems, and enables easy and reliable screw unwinding, reduces manual labor, saves labor, and improves work safety. It is an object of the present invention to provide a boring rod screw unwinding device that can be implemented at low cost.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a spindle into which upper and lower boring rods that are screwed are inserted, and a spindle that engages with the spindle and is detachably attached to the outer periphery of the lower boring rod. A hydraulic chuck device that engages and holds the lower boring rod on the spindle side during operation, and a rod clamp device that is detachably mounted on the upper side of the device and that is disposed so as to surround the upper boring rod. A boring rod screw unwinding device for holding the lower boring rod by a hydraulic chuck device, the upper boring rod by a rod clamp device, and rotating the spindle to release the screw connection part. A table table detachably mounted on the upper surface of the hydraulic chuck device; An annular rod clamp case placed on a table and arranged so as to surround the upper boring rod, and a plurality of piece guides that are vertically installed and fixed on the table table along the axial direction of the boring rod. A pin, an eccentric piece slidably and eccentrically supported by the piece guide pin, and an outer peripheral surface of which is arranged close to the outer circumference of the upper boring rod in a detachable manner, and which holds the eccentric piece and The rod clamp case comprises an annular set ring that is inserted into the outer periphery of the rod clamp case, and a connecting handle that is supported by the set ring and that has a stopper pin that connects the rod clamp case and the set ring. The case constitutes a boring rod unwinding device in which a relief part is formed along the circumferential direction to prevent interference with the eccentric piece. That. More specifically, the eccentric piece is a cylindrical body provided with eccentric guide holes to be inserted into piece guide pins arranged at equal intervals on the same circumference of the table base, and The boring rod screw unwinding device comprises a lever pin extending along the radial direction, and the tip side of the lever pin is held by the set ring.

[0007]

[Action]

 First, after positioning the screw coupling portion at a predetermined position, the lower boring rod is fixed by the hydraulic chuck device and the upper boring rod is fixed by the rod clamp device. To firmly hold the upper boring rod with the rod clamp device, first free the connecting handle from the rod clamp case and rotate the connecting handle to rotate the set ring, which causes the eccentric piece to rotate around the piece guide pin. The outer peripheral surface of the moving rod is pressed against the outer periphery of the upper boring rod. Next, when the spindle is rotated, the lower boring rod is rotated via the hydraulic chuck device, and the screw connection part with the upper boring rod whose rotation is restricted by the rod clamp device is unwound. When the eccentric piece moves upward along the piece guide pin, the upper boring rod also moves upward and is released from the lower boring rod and pulled out. After that, by pulling up the screw connecting part of the lower boring rod to a predetermined position and repeating the same screw unwinding work as described above, the screw connecting parts are sequentially unwound and a plurality of boring rods are collected on the ground side. .

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial axial sectional view showing a detailed structure of main constituent elements of the present embodiment, FIG. 2 is a lateral sectional view taken along the line AA of FIG. 1, and FIG. 3 is a view for explaining a fixed state of a boring rod by an eccentric piece. 4 to 6 are schematic axial sectional views for explaining the screw unwinding process of the present embodiment.

First, a schematic structure of the boring rod screw unwinding device 1 will be described with reference to FIGS. 1 and 2. The boring rod screw unwinding device 1 is roughly classified into an upper boring rod 2 and a lower boring rod 3 which is screwed to the upper boring rod 2, and a spindle 4 arranged in a vertical direction. A hydraulic chuck device 5 that grips the outer circumference of the lower boring rod 3 by the force of 38 to connect the spindle 4 and the lower boring rod 3 and an upper boring rod 2 are provided so as to surround the hydraulic chuck device 5. The rod clamp device 6 is detachably mounted on the upper side of the.

First, the structure of the rod clamp device 6 will be described. The table base 7 is fixed on the cylinder cover 39 on the upper surface of the hydraulic chuck device 5 by bolts 8 or the like. A center hole 9 is formed in the center of the table base 8 through which the upper and lower boring rods 2 and 3 are inserted. A base end side of a rod clamp case 10 made of an annular member is fitted around the outer periphery of the table base 7, and a clamp cap 11 and a clamp cover 12 are fixed by bolts 13 to the upper side thereof. In addition, through holes through which the upper and lower boring rods 2 and 3 are inserted are formed at the centers of the clamp cap 11 and the clamp cover 12, respectively. A ring-shaped set ring 14 is attached to the outer periphery of the rod clamp case 10. The lower surface of the set ring 14 is supported by the protruding surface 15 of the rod clamp case 10 to prevent it from falling. As shown in FIGS. 1 and 2, a plurality of (three in the figure) piece guide pins 16 are erected and fixed on the same circumference of the table base 7 at equal intervals. The piece guide pin 16 is made of a bolt-shaped member, its head is held on the side of the clamp cover 12, and the threaded portion on the lower end side is screwed onto and fixed to the table base 7.

As shown in FIGS. 1 and 2, the eccentric piece 17 has a cylindrical body 18 and a lever pin 20 extending in a radial direction from an outer peripheral surface 19 of the cylindrical body 18 in an integrated structure. An eccentric hole 21 to be inserted into the piece guide pin 16 is formed through the cylindrical body 18. As shown in FIG. 2, the eccentric piece 17 is inserted into and attached to the three piece guide pins 16 on the table base 7, and the lever pins 20 are arranged outward. The lever pin 20 penetrates the escape portion 22 of the rod clamp case 10, and the tip end side thereof is held in the locking hole 23 of the set ring 14. The escape portion 22 is formed to have an appropriate length along the circumferential direction of the rod clamp case 10 to prevent interference with the lever pin 20 when the eccentric piece 17 rotates.

As shown in FIG. 1, the connecting handle 24 is slidably supported by a stopper case 25, one end of which is fixed to the set ring 14, and the stopper case 25. A stopper pin 27 that is detachably inserted into the connecting hole 26, a spring 28 that is housed in the stopper case 25 to press the stopper pin 27 toward the rod clamp case 10, and a stopper 28 that is held by the stopper case 25 and is a stopper. It comprises a knob 29 and the like to which the pin 27 is connected. When the stopper pin 27 is pulled out by the knob 29, the tip of the stopper pin 27 is disengaged from the connecting hole 26 of the rod clamp case 10. In this state, by moving the connecting handle 24 in the circumferential direction, the set ring 14 is rotated, the lever pin 20 of the eccentric piece 17 held in the locking hole 23 is moved, and the piece guide pin 16 is centered. The eccentric piece 17 rotates. Therefore, the outer peripheral surface 19 of the eccentric piece 17 comes into pressure contact with the outer periphery of the upper boring rod 2. The outer peripheral surface 19 is formed so as to be separated from the outer periphery of the upper boring rod 2 by moving the connecting handle 24 in the opposite direction.

Next, the structures of the spindle 4 and the hydraulic chuck device 5 will be briefly described with reference to FIGS. As shown in FIG. 4, the spindle 4 is supported by the drive unit 31 of the drilling machine 30 and is rotationally driven. The upper end of the spindle 4 is inserted and positioned in the center of the cylinder body 32 of the hydraulic chuck device 5 as shown in FIG. The piston 33 is slidably supported by the cylinder body 32, and the spindle 4 is pivotally supported by the piston 33 via a bearing 34 and a sleeve 35. Further, the sleeve 35 and the spindle 4 are rotatably connected via a key 36, and a wedge member 37 is interposed between them. A leaf spring 38 for pressing the piston 33, the sleeve 35 and the like upward is housed in the cylinder body 32, and the upper end of the cylinder body 32 is covered with a cylinder cover 39 and an upper cap 40. A center hole through which the upper and lower boring rods 2 and 3 are inserted is formed at the center of the upper cap 40. With the above structure, the hydraulic oil is discharged from the inside of the cylinder main body 32, and the force of the spring 38 prevails, and the wedge member 37 moves via the sleeve 35 and comes into pressure contact with the outer circumference of the lower boring rod 3. As a result, the sleeve 35, the spindle 4, and the lower boring rod 3 are integrally connected. Therefore, by rotating the spindle 4, the sleeve 35 rotates in the piston 33 via the bearing 34, and the lower boring rod 3 also rotates accordingly. To release the lower boring rod 3, hydraulic oil is introduced from the hydraulic oil injection hole 45 to move the piston 33 downward, and the wedge member 37 is separated from the lower boring rod 3 via the sleeve 35. . The hydraulic chuck 5 and the rod clamp device 6 are connected to the piston rod 47, which is connected to the piston of the lifting hydraulic cylinder 46 together with the spindle 4, and can move up and down with respect to the drive unit 31.

Next, the screw unwinding action of the upper and lower boring rods 2, 3 by the boring rod screw unwinding device 1 of the present embodiment will be described. As shown in FIGS. 1 and 4, the threaded connection portion between the male screw portion 41 of the upper boring rod 2 and the female screw portion 42 of the lower boring rod 3 is positioned at the position shown. This is done by moving the entire boring rod in the axial direction by means of a hoisting swivel (not shown) connected to the upper boring rod 2 and positioning it based on a mark (not shown). In this case, as shown in FIG. 2, the outer peripheral surface 19 of the eccentric piece 17 of the rod clamp device 6 is located away from the outer periphery of the upper bowling rod 2. That is, the rod clamp device 6 is in a free state. Further, the wedge member 37 of the hydraulic chuck device 5 is also positioned away from the outer circumference of the lower boring rod 3, and the hydraulic chuck device 5 is also in the open state. Next, the knob 29 of the connecting handle 24 is pulled out, the stopper pin 27 is removed from the connecting hole 26 of the rod clamp case, and it is rotated counterclockwise as shown in FIG. As a result, the set ring 14 rotates, the lever pin 20 held in the locking hole 23 moves, and the eccentric piece 17 rotates about the piece guide pin 16. Therefore, the outer peripheral surface 19 of the cylindrical body 18 of the eccentric piece 17 is pressed against the outer periphery of the upper boring rod 2, and the upper boring rod 2 is firmly held. On the other hand, by discharging the hydraulic oil from the hydraulic chuck device 5, the force of the spring 38 prevails, the piston 33 is moved, and the wedge member 37 presses against the outer circumference of the lower boring rod 3 and firmly holds it. Since the wedge member 37 is supported by the sleeve 35, the sleeve 35, the spindle 4 and the lower boring rod 3 are integrally connected and are rotatably supported in the hydraulic chuck device 5. As described above, the upper boring rod 2 and the lower boring rod 3 are firmly held by the rod clamp device 6 and the hydraulic chuck device 5, respectively.

Next, as shown in FIG. 5, the upper boring rod 2 is suspended by the hoisting swivel 43 and the like, the drive unit 31 is operated, and the spindle 4 is rotated. As a result, the lower boring rod 3 fixed to the hydraulic chuck device 5 rotates. On the other hand, as described above, since the upper boring rod 2 is fixedly held by the rod clamp device 6, the male screw portion 41 and the female screw portion 42 are unscrewed, and the eccentric piece 17 is moved upward along the piece guide pin 16. With the movement, the upper boring rod 2 moves upward, and the tightness of the screw joint is released. Here, the holding of the hydraulic chuck device 5 and the rod clamp device 6 is released, and the loosened screw is manually rotated to separate the upper boring rod 2 from the lower boring rod 3. FIG. 5 shows the state. Then, the upper boring rod 2 is removed by the hoisting swivel 43. At the same time, the lower side of the lower boring rod 3 is held by an unillustrated rod holder, rod tongs, or the like. Here, the hydraulic chuck device 5 and the rod clamp device 6 are lowered by the operation of the piston rod 47 connected to the piston in the lifting hydraulic cylinder 46, and the tip of the lower boring rod 3 is projected from the upper surface of the rod clamp device 6. As shown in FIG. 6, the hoisting swivel 43 is connected, the lower boring rod 3 is pulled upward, and the screw connection portion 44 with the next lower boring rod 3'is raised to a predetermined position. Next, the hydraulic chuck device 5 and the rod clamp device 6 are raised to position the screw coupling portion 44 of the lower boring rod 3'in the state shown in FIG. After that, by repeating the same operation, the threaded joints of the boring rods are released one after another, and many boring rods are collected on the ground side.

[0016]

[Effect of device]

 According to the present invention, the following remarkable effects are obtained. 1) By unfastening the upper and lower boring rods respectively, and then rotating the lower boring rod in this state to release the screw engagement with the upper boring rod, the unscrew of the tightly screwed threaded joint is released. Is performed easily and reliably. 2) Unlike the prior art, it is not necessary to firmly hold one side of the device such as a pipe wrench on the stationary side of the device, so the screw unwinding work can be performed safely. In addition, the stationary side of the device will not be damaged. 3) Holding the boring rod and rotating the boring rod during screw unwinding are all performed automatically, so that the screw unwinding work can be performed in a short time and the recovery efficiency of the boring rod can be improved. 4) Labor can be saved because the number of operators who operate the equipment can be reduced.

[Brief description of drawings]

FIG. 1 is a partial axial sectional view showing a detailed structure of main components of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a transverse cross-sectional view for explaining a fixed state of a boring rod by the rod clamp device according to the present embodiment.

FIG. 4 is a schematic axial sectional view for explaining the operation of the present embodiment.

FIG. 5 is a schematic axial sectional view for explaining the operation of the present embodiment.

FIG. 6 is a schematic axial sectional view for explaining the operation of the present embodiment.

[Explanation of symbols]

 1 Boring rod unwinding device 2 Upper boring rod 3 Lower boring rod 3'Lower boring rod 4 Spindle 5 Hydraulic chuck device 6 Rod clamp device 7 Table base 8 Bolt 9 Center hole 10 Rod clamp case 11 Clamp cap 12 Clamp cover 13 Bolt 14 Set ring 15 Projection surface 16 Piece guide pin 17 Eccentric piece 18 Cylindrical body 19 Outer peripheral surface 20 Lever pin 21 Eccentric hole 22 Escape portion 23 Locking hole 24 Connecting handle 25 Stopper case 26 Connecting hole 27 Stopper pin 28 Spring 29 Knob 30 Trial Machine 31 Drive part 32 Cylinder body 33 Piston 34 Bearing 35 Sleeve 36 Key 37 Wedge member 38 Leaf spring 39 Cylinder cover 40 Upper cap 41 Male screw part 42 Female screw part 43 Whistle Gusuiberu 44 hydraulic cylinder 47 piston rod for elevating screw connection 45 hydraulic oil injection hole 46

Claims (2)

[Scope of utility model registration request] 1. A spindle into which upper and lower boring rods, which are screw-coupled, are inserted, and a spindle which engages with the spindle and detachably engages with an outer periphery of the lower boring rod so as to be attached to the spindle side during operation. A hydraulic chuck device for firmly holding the lower boring rod, and a rod clamp device which is detachably mounted on the upper side of the device and is arranged so as to surround the upper boring rod, and the lower boring rod is hydraulically chucked. Is a boring rod screw unwinding device that holds the upper boring rod by a rod clamp device and rotates the spindle to release the screw connection part, wherein the rod clamp device is an upper surface of the hydraulic chuck device. A table that is removably mounted on the table, and the upper boring that is mounted on the table. An annular rod clamp case arranged around the rod, a plurality of piece guide pins fixed upright on the table base along the axial direction of the boring rod, and slidable on the piece guide pins To
And an eccentric piece which is eccentrically supported and whose outer peripheral surface is arranged close to the outer circumference of the upper boring rod in a detachable manner, and an annular piece which holds the eccentric piece and is attached to the outer circumference of the rod clamp case. The rod clamp case includes a set ring and a connecting handle that is supported by the set ring and has a stopper pin that connects the rod clamp case and the set ring. The rod clamp case has an escape portion for preventing interference with an eccentric piece. A boring rod screw unwinding device, which is formed along the circumferential direction. 2. The eccentric piece includes a cylindrical body provided with eccentric guide holes to be inserted into piece guide pins arranged at equal intervals on the same circumference of the table base, and a radius from the cylindrical body. 2. A boring rod screw unwinding device according to claim 1, further comprising a lever pin extending along the direction, the tip end side of said lever pin being held by said set ring.