JP2004197335A - Excavating rod for extensive excavator, and reaming bit for use therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excavating rod which is for use in excavating a hole at the time of a soil improvement etc. by extending the bottom of the hole, wherein a reaming bit once extended can be easily contracted. <P>SOLUTION: The excavating rod is formed of a hollow outer pipe (2), an inner pipe (3) inserted into the outer pipe in an axially reciprocative manner, an operating rod (4) connected to the tip of the inner pipe (3), and the reaming bit (21) connected to the outer pipe (2). The reaming bit (21) is comprised of a bit joint (7), a pressing pin (5), and a pair of bit main bodies (11). The bit joint (7) is connected to the outer pipe (2) and has a recessed groove (10) at the tip thereof. The pressing pin (5) is penetrated through the bit joint (7) and has a rear end connected to the operating rod (4). The bit main bodies (11) have slots (1102) in the vicinity of the rear end, and they are rotatably connected to each other in the recessed groove (10) such that side surfaces of the respective main bodies are brought closer to each other and that ends of the respective slots (1102) are superposed on each other. Further the bit main bodies (11) are rotatably engaged with the tip of the pressing pin (5) via the slots (1102). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drilling rod in an enlarged drilling device and a drilling bit used therefor, and more specifically, it is possible to easily reduce a drilling bit enlarged in a drilling hole and freely adjust the diameter of the drilling bit. The present invention relates to a drilling rod and a drilling bit used for the drilling rig which can be used.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when performing ground improvement or the like using a digging apparatus, when digging with a hole bottom enlarged, a digging rod equipped with a piercing bit has been used. -64759 "anchor method and ground improvement method and an enlarged excavator used therefor" are known.
[0003]
This drill rod will be described with reference to FIGS. 7 to 9. FIG. 7 is a vertical cross-sectional side view of the drill rod having the drill bit. In the drawing, an enlarged drill unit 32 is attached to the tip of the drill bit 31. In addition, a connecting rod 33 is inserted through the inside thereof with a gap around the connecting rod 33.
[0004]
The enlarged excavation unit 32 fits the main body 35 connected to the extremity of the excavation rod 31 with a screw type joint, and the base ends on the left and right into the concave groove 36 provided at the extremity of the main body 35, respectively. And a pair of left and right excavating bits 38 rotatably attached to each other, and a bit operating rod 40 connected to the distal end of the connecting rod 33 by a threaded joint and inserted through a center hole penetrating the center of the main body 35 so as to be able to advance and retreat. Have been.
[0005]
The right and left excavation bits 38 rotate from a reduced position protruding toward the front of the excavation rod 31 to a magnified position where the left and right excavation bits 38 are laterally symmetrically separated from each other by about 90 degrees. The opposite inner corner 38a is formed so as to protrude forward of the front end opening of the center hole.
[0006]
With such a configuration, by advancing the bit operating rod 40 in the center hole, its tip hits the corner 38a of the left and right excavation bit 38 and presses it forward, and by the action of the moment, FIG. As shown in FIG. 5, the drill bits 38 are rotated about the pivot 37 so as to be separated from each other sideways so as to be spread to the enlarged position.
[0007]
Therefore, after digging for a required length while rotating the digging rod with the digging bit in the reduced position, the digging bit is rotated to the enlarged position by advancing the bit operating rod, and while rotating the digging rod in this state. By digging, the portion other than the ground improvement portion is excavated with a small diameter, and the ground improvement portion can be uniformly excavated.
[0008]
[Problems to be solved by the invention]
By the way, when performing ground improvement, it is necessary to raise the excavation bit after excavation, at this time, when excavating the hole bottom as described above, when raising the excavation bit, It is necessary to return the drill bit used to drill the enlarged hole to the reduced position.
[0009]
However, in the aforementioned drilling rod, when returning the drilling bit to the reduced position, the bit operation lot is retracted, thereby making the rotation of the drilling bit free. It has been pointed out that because of the reduction, the soil or rubble mixed in the drilled anchor hole becomes an obstacle, and the reduction of the drill bit may not be performed smoothly.
[0010]
Also, in the above-mentioned drilling rod, by advancing the bit operating rod, the tip thereof is applied to the corners of the left and right drilling bits and pressed forward, and by the action of the moment, the drilling bits are respectively pivoted. It was difficult to adjust the diameter of the drilling bit because it was configured to rotate so as to be separated from each other sideways as the center and expand to the enlarged position, and it was impossible to adjust the diameter of the enlarged hole. .
[0011]
In this regard, in the aforementioned Japanese Patent Application Laid-Open No. 2000-64759, as shown in FIG. 9, a pinion 41 is formed at the rear end of the left and right excavation bits 38, and a rack 42 is formed at the tip of the bit operation rod 40. Although a technology has been disclosed that allows the drill bit 38 to return to the contracted position by retracting the bit operation rod 40 by engaging the pinion 41 with the rack 42, but even with such a configuration, soil, rubble, etc. If the obstacle is large, the pinion 41 and the rack 42 idle, and as a result, the reduction of the excavation bit 38 may not be performed smoothly.
[0012]
In view of the above, the present invention provides a method for enlarging a hole bottom in a ground improvement or the like, in which the enlarged hole can be easily reduced and the diameter of the hole can be freely adjusted. An object of the present invention is to provide a drilling rod for a drilling device and a drilling bit used therefor.
[0013]
[Means for Solving the Problems]
The drilling rod in the enlarged drilling device of the present invention is a hollow outer pipe, an inner pipe inserted in the outer pipe so as to be able to advance and retreat in the axial direction, and an operating rod connected to a distal end of the inner pipe. A drilling rod in an enlarged drilling rig, comprising: a drilling bit connected to the outer pipe;
The perforation bit,
A bit joint connected to the outer tube and having a concave groove formed at a distal end thereof;
A pressing pin that penetrates the bit joint and is connected to the operating rod at a rear end;
A long groove is provided in the vicinity of the rear end, and one side is brought close to each other, and one end of the long groove is rotatably connected to the inside of the concave groove in the bit joint in such an arrangement that one end of the long groove overlaps. A pair of bit bodies rotatably locked to the distal end portion of the pressing pin through
The bit body is rotated from a reduced position protruding forward of the outer tube to an enlarged position in which the push pin is moved forward and left sideways so as to be symmetrically separated from each other by about 90 degrees, and the enlarged position. Wherein the pressing pin is retracted so that it can return to the reduced position.
[0014]
In the present invention, the bit main body is rotatable about the bit joint connected to the outer tube in an arrangement in which one ends of the long grooves formed near the rear end overlap each other, and in an arrangement in which one side is close to each other. And the bit main body is rotatably locked to the pressing pin connected to the distal end of the operating rod via the long groove.
[0015]
With this configuration, by moving the pressing pin forward and backward, the bit main body is expanded from the reduced position protruding toward the front of the outer tube to the left and right symmetrically away from each other about 90 degrees in an enlarged position. , And it is possible to return from the enlarged position to the reduced position.
[0016]
As described above, in the present invention, the diameter of the bit body can be increased by advancing the pressing pin through the operating rod, and the expanded bit body is reduced by retracting the pressing pin in this expanded state. It is possible to return to the state.
[0017]
Therefore, unlike the conventional technique of reducing the drill bit by its own weight when lifting the drill rod, the drill bit can be easily reduced even when soil and rubble are mixed in the drilled enlarged hole. In addition, it is also possible to freely adjust the diameter of the hole expanding bit by adjusting the advance / retreat length of the operating rod.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
In the drill bit of the present invention, a hollow outer pipe having a rear end connected to a swivel is provided, and an inner pipe having a rear end connected to the swivel is provided inside the outer pipe in an axial direction. It is inserted so that it can move forward and backward. An operating rod is connected to the distal end of the inner tube, and a pressing pin is connected to the distal end of the operating rod.
[0019]
A bit joint is connected to the distal end of the outer tube. The bit joint has a concave groove at the distal end and has a through hole formed therein, and the pressing pin advances and retreats through the through hole. It penetrates freely.
[0020]
A pair of bit bodies are rotatably connected in the concave groove, and the bit body has a long groove near a rear end thereof, and is arranged such that one ends of the long grooves overlap with each other. And it is rotatably connected to the inside of the concave groove so as to be close to each other on one side, and is rotatably locked to the pressing pin via the long groove.
[0021]
Thus, it is possible to freely adjust the diameter of the bit main body as the pressing pin advances and retreats.
[0022]
【Example】
An embodiment of a drilling rod of the present invention and a drill bit used therefor will be described with reference to the drawings. FIG. 1 to FIG. 3 are longitudinal sectional views of the drilling rod of the present embodiment. Drilling rod.
[0023]
The excavating rod 1 has an outer tube, that is, 2 is an outer tube in the figure, and the outer tube 2 is formed by connecting a required number of hollow short tubes. A swivel with a built-in mechanism is connected to the rear end, so that the swivel can move forward and backward in the axial direction and rotate freely.
[0024]
Next, inside the outer tube 2, an inner tube 3 is inserted so as to be able to advance and retreat in the axial direction while maintaining a clearance around the inner tube. 4 are connected.
[0025]
The rear end of the inner tube 3 is connected to a cylinder rod of a piston built in a swivel (not shown), so that the inner tube 3 can freely advance and retreat in the axial direction.
[0026]
Next, a hole-expanding bit 21 is connected to the distal end of the outer tube 2. In this embodiment, the hole-expanding bit 21 is connected to the bit joint 7 connected to the outer tube 2 and the bit joint 7. 7 and a pair of pressing pins 5 connected to the operating rod 4 at the rear end thereof, and a pair of pins rotatably connected to the bit joint 7 and rotatably locked to the pressing pins 5. And a bit body 11 of
[0027]
Here, the bit joint 7 includes a joint portion 8, a main body portion 9 connected to the joint portion 8 by a bolt 13 or the like via a bolt hole 802, and a concave groove formed near a lower end portion of the main body portion 9. 10 is provided.
[0028]
The joint portion 8 is screwed to the outer tube 2 and has a through hole 801 formed therein through which the operating rod 4 penetrates. Are formed therein.
[0029]
The main body 9 communicates with a through hole 801 formed in the joint portion 8 and has a guide hole 901 having a diameter larger than that of the through hole 801. A pressing pin 5 connected to the tip of the rod 4 is inserted.
[0030]
Further, a flow path 902 communicating with a flow path 803 formed in the joint part 8 is formed inside the main body part 9, and the leading end thereof is opened, whereby the outer pipe 2 and the inner pipe 3 are opened. Drilling water or a chemical liquid such as cement milk injected into the gap between them can be discharged from the tip of the drilling rod 1.
[0031]
Next, the pressing pin 5 is provided with a large-diameter stopper 501 in the vicinity of the connection portion with the operating rod 4, and the range in which the stopper 501 can move is limited to the range in which the stopper 501 moves in the guide hole 901. Have been. In addition, the front end portion of the main body portion 9 extends through the guide hole 901 to reach the concave groove portion 10, and the front end portion is provided with a locking pin 6 in a direction orthogonal to the longitudinal direction. The pair of bit bodies 11 is locked to the pressing pin 5 via the locking pin 6.
[0032]
Here, the bit main body 11 will be described. FIG. 4 is a plan view of the pair of bit main bodies 11, and in the present embodiment, the bit main bodies 11 extend at their rear ends toward the sides facing each other. A locking portion 1101 having a portion is provided, and the locking portion 1101 is provided with an arc-shaped long groove 1102. A bit 1103 is continuously provided at the tip of the locking portion 1101, and excavation is enabled by the bit 1103.
[0033]
The pair of bit bodies 11 are connected to each other through a pin hole 1104 in the concave groove 10 of the bit joint 7 in such a manner that one side of the main body 11 is close to one side and one end of the long groove 1102 is overlapped. They are rotatably connected by pins 12 and the like. A locking pin 6 provided at the tip of the pressing pin 5 penetrates the overlapping portion of the long groove 1102, whereby the bit body 11 is rotatably engaged with the pressing pin 5. Has been stopped.
[0034]
As described above, in the present embodiment, the pair of bit bodies 11 are rotatably connected in the concave groove 10 of the bit joint 7 in such an arrangement that one side faces are close to each other and one end of the long groove 1102 is overlapped. Further, the pin main body 11 is rotatably locked to the pressing pin 5 by penetrating the overlapping portion of the long groove 1102 with the pin 6 provided at the distal end of the pressing pin 5. 5 is advanced to the distal end side of the excavating rod 1, the long groove 1102 is pushed toward the distal end side of the excavating rod 1 by the locking pin 6, and the locking position between the long groove 1102 and the locking pin 6 changes, In accordance with the change of the locking position, the bit portions 1103 rotate so as to be separated from each other, and then each of the pair of bit bodies is separated from each other symmetrically by about 90 degrees. Leading to the enlargement position that has been brought down to sideways to.
[0035]
On the other hand, when the pressing pin 5 is retracted in this enlarged position, the long groove 1102 is pushed toward the rear end side of the excavating rod 1 by the locking pin 6, and the locking position between the long groove 1102 and the locking pin 6 changes. At the same time, according to the change in the locking position, the bit portions 1103 rotate so as to approach each other, and then return to the initial reduced state. FIGS. 2 and 3 show this relationship. FIG. 2 shows a state in which the bit body 11 is approaching the enlarged position, and FIG. 3 shows a state in which the bit body 11 has reached the enlarged position. ing.
[0036]
As described above, in the present embodiment, the bit body 11 can be enlarged and contracted by moving the pressing pin 5 forward and backward. Therefore, even when soil or rubble is mixed in the excavated enlarged hole, the bit body 11 is enlarged. The expanded bit can be easily returned to the reduced state, and the diameter of the expanded bit 6 can be freely adjusted by adjusting the advance / retreat length of the pressing pin 5.
[0037]
Next, a description will be given of a method of using the excavating rod 1 of the present embodiment configured as described above and its operation. When excavating for ground improvement or the like using the excavating rod 1 of the present embodiment, The rear ends of the pipe 2 and the inner pipe 3 are connected to a swivel (not shown) having a built-in piston-cylinder mechanism, and the drill body 1 is advanced while rotating the drill rod 1 while the bit body 11 is reduced. , Thereby excavating by a predetermined length.
[0038]
After digging a predetermined length, the piston pin mechanism is operated to advance the pressing pin 5 via the inner pipe 2 and the operating rod 4. Then, the bit main body 11 can be expanded as described above, and in this state, the drill rod 1 is further dug to form a large-diameter hole. At this time, drilling water or a chemical such as cement milk is injected between the outer pipe 2 and the inner pipe 3 via a swivel, and the drilling water or the chemical is injected into the joint section 8. The water is discharged from the distal end of the excavating rod 1 through a channel 803 and a channel 902 formed in the main body 9.
[0039]
Next, after the large-diameter hole is formed, the operating rod 4 is retracted so that the pressing pin 5 is retracted to return the diameter of the bit body 11 to a reduced state, and the drilling rod is pulled up in that state. Then, it becomes possible to form a drilled hole in which the bottom hole is enlarged.
[0040]
At this time, in this embodiment, the diameter of the bit main body 11 can be freely adjusted only by moving the pressing pin 5 forward and backward. In addition, even when soil and rubble are mixed in the excavated hole, the bit body 11 can be easily reduced.
[0041]
Further, the diameter of the bit body 11 can be freely adjusted by adjusting the advance / retreat length of the operating rod, so that a desired hole can be formed.
[0042]
In the above-described embodiment, the case where the long groove 1102 formed in the bit main body 11 is formed in an arc shape is described. However, the long groove 1102 is not necessarily required to be formed in an arc shape. For example, as shown in FIGS. Alternatively, the bit body 11 may have a linear shape directed in a direction perpendicular to the longitudinal direction. In such a case, when the pressing pin 5 is advanced in a state where the bit body 11 shown in FIG. 5 is reduced, the long groove 1102 is pushed toward the distal end side of the excavating rod 1 by the locking pin 6 and is locked with the long groove 1102. As the locking position with the pin 6 changes, the bit portions 1103 rotate away from each other in accordance with the change in the locking position, and then each of the pair of bit bodies is symmetrically about 90 degrees. It reaches the enlarged position which has been laid down sideways so as to move away from each other. This state is the state shown in FIG.
[0043]
When the operating rod 4 is retracted in this state, the pressing pin 5 is retracted, and the long groove 1102 is pushed to the rear end side of the excavating rod 1 by the locking pin 6, and the long groove 1102 and the locking pin 6 As the locking position changes, the bit portions 1103 rotate so as to approach each other according to the change in the locking position, and then return to the initial reduced state shown in FIG.
[0044]
【The invention's effect】
The drill rod of the present invention and the drill bit used therefor are implemented in the form described above, and have the following effects.
[0045]
The drilling rod in the enlarged drilling device of the present invention is a hollow outer pipe, an inner pipe inserted in the outer pipe so as to be able to advance and retreat in the axial direction, and an operating rod connected to a distal end of the inner pipe. A drilling rod in an enlarged drilling device comprising: a drilling bit connected to the outer pipe; wherein the drilling bit is connected to the outer pipe and has a bit joint formed with a concave groove at a distal end. A push pin that penetrates the bit joint and is connected to the operating rod at the rear end and a long groove near the rear end, so that one side surface is close to each other and one end of the long groove is overlapped. A pair of bit bodies rotatably connected to the recessed groove in the bit joint and further rotatably locked to the distal end portion of the pressing pin via the long groove. Body Rotating from a reduced position protruding forward of the outer tube to an enlarged position in which the pressing pin is advanced to the left and right sideways so as to be separated from each other symmetrically by about 90 degrees, and in the enlarged position, It is characterized in that it is possible to return to the reduced position by retracting the pressing pin.
[0046]
As described above, according to the present invention, the bit body connected to the outer pipe is arranged in such a manner that one end of the long groove formed near the rear end overlaps, and in such an arrangement that one side surface is close to each other. Is rotatably connected, and the bit body is locked to the pressing pin connected to the distal end of the operating rod via the long groove. It is possible to rotate the main body from a reduced position protruding forward of the outer tube to an enlarged position in which the main body is tilted sideways so as to be separated from each other symmetrically about 90 degrees, and to return from the enlarged position to the reduced position. I have.
[0047]
Therefore, unlike the conventional technique of reducing the drill bit by its own weight when lifting the drill rod, the drill bit can be easily reduced even when soil or rubble is mixed in the drilled enlarged hole. In addition, it is also possible to freely adjust the diameter of the hole expanding bit by adjusting the advance / retreat length of the operating rod.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state in which a bit main body is reduced in an embodiment of a drill rod according to the present invention.
FIG. 2 is a longitudinal sectional view showing a state where a bit main body is enlarged in the embodiment of the excavation rod of the present invention.
FIG. 3 is a longitudinal sectional view showing an enlarged state of a bit main body in the embodiment of the excavation rod of the present invention.
FIG. 4 is a plan view for explaining a bit body in the embodiment of the excavation rod of the present invention.
FIG. 5 is a diagram for explaining an embodiment of a drill rod according to the present invention.
FIG. 6 is a view for explaining an embodiment of a drill rod according to the present invention.
FIG. 7 is a vertical sectional side view for explaining a conventional drill rod.
FIG. 8 is a longitudinal sectional side view for explaining a conventional drill rod.
FIG. 9 is a longitudinal sectional side view for explaining a conventional drill rod.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drilling rod 2 Outer pipe 3 Inner pipe 4 Operating rod 5 Pressing pin 501 Stopper 6 Locking pin 7 Bit joint 8 Joint part 801 Pipe through hole 802 Bolt hole 803 Flow path 9 Main body part 901 Guide hole 902 Flow path 10 Concave groove part 11 Bit body 1101 Locking portion 1102 Long groove 1103 Bit portion 1104 Pin hole 12 Connecting pin 13 Bolt 21 Expanded bit

Claims (2)

A hollow outer tube (2);
An inner pipe (3) inserted in the outer pipe (2) so as to be able to advance and retreat in the axial direction;
An operating rod (4) connected to a distal end of the inner pipe (3);
A drilling rod in an enlarged drilling rig comprising: a drilling bit (21) connected to the outer pipe (2);
The piercing bit (21) includes:
A bit joint (7) connected to the outer tube (2) and having a concave groove (10) formed at a tip thereof;
A pressing pin (5) penetrating through the bit joint (7) and connected at the rear end to the operating rod (4);
A long groove (1102) is provided in the vicinity of the rear end, and one side is brought close to each other and one end of the long groove (1102) is overlapped in the concave groove (10) in the bit joint (7). A pair of bit bodies (11) rotatably connected to each other and rotatably locked to the distal end of the pressing pin (5) via the long groove (1102);
The bit body (11) is tilted sideways so as to be symmetrically separated from each other by about 90 degrees by advancing the pressing pin (5) from a reduced position protruding forward of the outer tube (2). A drilling rod in an enlarged excavator, wherein the excavating rod is rotated to an enlarged position, and in the enlarged position, it is possible to return to the reduced position by retracting the pressing pin (5). A hollow outer tube (2), an inner tube (3) inserted in the outer tube (2) so as to be able to advance and retreat in the axial direction, and an operating rod (3) connected to a distal end of the inner tube (3). 4) a drilling bit (21) connected to the tip of a drilling rod in an expanding drilling device comprising: (4) a recessed groove (10) formed at the tip and connected to the outer pipe (2). Bit joint (7),
A pressing pin (5) penetrating through the bit joint (7) and connected at its rear end to the operating rod (4)
A long groove (1102) is provided in the vicinity of the rear end, and one side is brought close to each other and one end of the long groove (1102) is overlapped in the concave groove (10) in the bit joint (7). A pair of bit bodies (11) rotatably connected to each other and rotatably locked to the distal end of the pressing pin (5) via the long groove (1102);
The bit body (11) is tilted sideways so as to be symmetrically separated from each other by about 90 degrees by advancing the pressing pin (5) from a reduced position protruding forward of the outer tube (2). A drilling bit used for a drilling rod in an expanding excavator, wherein the drilling bit rotates in an expanding position, and can return to a reduced position by retracting the pressing pin (5) in the expanding position.

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