JP2001040986A - Flexible boring rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible boring rod which can flex. SOLUTION: This flexible boring rod 30 comprises an intermediate rod 38, a male rod 40 and a female rod 42. The intermediate rod 38 and the male rod 40 are interconnected via a joint 44 in such a manner as to be capable of being flexed by pins 50A, 50B in two mutually perpendicular directions. The intermediate rod 38 and the female rod 42 are interconnected via a joint 60 in such a way as to be capable of being flexed by pins 66A, 66B in two mutually perpendicular directions. Thus, the flexible boring rod 30 can easily bore even a borehole with a steep curvature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible boring rod, and more particularly to a flexible boring rod capable of excavating at a sharp curvature.

[0002]

2. Description of the Related Art When burying gas pipes, water and sewage pipes, and electric conduits in the ground, when a small diameter hole is passed through the surface at the point of arrival from horizontal excavation, or when there is a buried pipe or obstacle Changes direction with the bit at the tip and excavates. Since the boring rod follows the excavation hole and bends, it is necessary to avoid the obstacle by bending the boring rod during excavation. In the conventional boring apparatus, the boring rod is bent depending on the rigidity of the boring rod. But,
In the case of this method, there is a limit that the range in which the boring rod can be bent is limited, so that excavation with a large curvature cannot be performed. Therefore, in JP-A-10-61377, the boring rod is configured to be bendable by connecting the rods with pins.

[0003]

However, in the boring rod disclosed in Japanese Patent Application Laid-Open No. H10-61377, the boring rod can be bent only in one plane, so that the range of curvature excavation is limited in one plane. There is a disadvantage that it is limited to.

[0004] The present invention has been made in view of such circumstances, and has as its object to provide a flexible boring rod that can be bent.

[0005]

The invention according to claim 1 is
In order to achieve the above object, in a flexible boring rod that can be sequentially connected, a male rod having a convex portion at the distal end, a female rod having a concave portion at the distal end to be fitted to the convex portion of the male rod, and one end having a base end of the male rod. And a joint whose other end is connected to the base end of the female rod via a pin so as to bend in a direction perpendicular to the bending direction. .

According to the present invention, a male rod and a female rod connected via a joint can be bent in two orthogonal directions. Thereby, curvature excavation can be performed. The flexible boring rods can be easily connected by fitting the male rod of one flexible boring rod to the female rod of the other flexible boring rod.

According to a second aspect of the present invention, there is provided a flexible boring rod which can be sequentially connected, comprising: a male rod having a convex portion at a tip thereof;
A female rod having a concave portion at the distal end to be fitted to the convex portion of the male rod, an intermediate rod disposed between the male rod and the female rod, and one end being bendable via a pin to a base end of the male rod. A first joint having a second end connected to one end of the intermediate rod via a pin so as to be bendable in a direction orthogonal to the bending direction, and one end having a pin connected to a base end of the female rod via a pin; A second joint having a second end connected to the other end of the intermediate rod via a pin so as to bend in a direction orthogonal to the bending direction.

According to the present invention, the connecting portion between the male rod and the intermediate rod and between the female rod and the intermediate rod can be bent in two orthogonal directions. Thereby, curvature excavation can be performed.

According to a third aspect of the present invention, there is provided a flexible boring rod according to the first or second aspect, wherein the flexible boring rod is formed in a hollow shape, The joint is equipped with packing and is capable of sending water.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a flexible boring rod according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view of a boring apparatus using a flexible boring rod according to the present invention.
As shown in the figure, the boring apparatus excavates underground by applying rotation and thrust to a flexible boring rod 30 from a rotary propulsion device 14 installed in a shaft 12.

The rotary propulsion device 14 has a rotary propulsion device main body 16 slidably provided on a guide rail 22 laid on a base 20. This rotary propulsion device body 1
Reference numeral 6 includes a propulsion cylinder (not shown), which is driven by the propulsion cylinder to slide on a guide rail. Further, the rotary propulsion device main body 16 includes a drive shaft that rotates by being driven by a hydraulic motor, and the flexible boring rod 30 is connected to the drive shaft. And
Flexible boring rod 30 connected to drive shaft
Is rotated by driving a hydraulic motor, and thrust is given by driving a propulsion cylinder.

FIG. 2 shows a flexible boring rod 3
FIG. 2 is a side cross-sectional view showing the configuration of No. 0. As shown in the figure,
The flexible boring rod 30 is formed so as to be able to be successively extended, and a bit 32 having directivity is attached to a tip portion thereof. The bit 32 is formed in a cylindrical shape, and a tapered surface 32A is formed at the tip thereof. A number of teeth 34, 34,... Are planted on the tip end surface of the bit 32.
The ground is excavated by 34,.

The flexible boring rod 30 has a hollow intermediate rod 38, a hollow male rod 40 connected to the front end of the intermediate rod 38 so as to be bendable, and a bendable rear end of the intermediate rod 38. And a hollow female rod 42 connected thereto.

The intermediate rod 38 and the male rod 40
They are connected via a joint 44, and the connection part is configured as follows.

As shown in FIG. 3, the joint 44 is formed in a hollow shape. The rear end of the male rod 40 has a tapered hole 4 into which the front half of the joint 44 is fitted.
6 are formed along the axis. Also, the intermediate rod 3
A tapered hole 48 into which the rear half of the joint 44 is fitted is formed along the axis at the distal end portion 8.
The joint 44 is fitted into a hole 46 formed at the rear end of the male rod 40 and a hole 48 formed at the front end of the intermediate rod 38, and the first pin 50A and the second pin 50
B.

That is, in the joint 44, two pin holes 52A and 52B orthogonal to each other are formed.
As shown in FIG. 4, the two pin holes 52A and 52B are
The pin holes 54A formed in the male rod 40 and the pin holes 54B formed in the intermediate rod 38 are matched. Then, the pin holes 52A, 52B aligned
The male rod 40 and the intermediate rod 38 are connected by fitting the first pin 50 </ b> A and the second pin 50 </ b> B into the male rod 40.

As shown in FIG. 4, the first pin 50A
And the second pin 50B are formed so as to be dividable. That is, the first pin 50A and the second pin 50B are composed of pins 50a ₁ and 50b ₁ formed with male threads and pins 50a ₂ and 50b ₂ formed with female threads. At the time of connection, the divided pins 50a ₁ , 50b ₁ , 50a ₂ , 50b ₂ are inserted into the pin holes 54.
A and 54B are inserted from both sides and screwed together to join.

The first pin 50A and the second pin 50B
However, the present invention is not limited to this, and can be inserted with pins by other effective means.

By the way, the male rod 40 and the intermediate rod 38 connected to the joint 44 as described above have the first pins, respectively, because the holes 46 and 48 in which the joint 44 is fitted are formed in a tapered shape. 5
0A and the second pin 50B so as to be able to bend around the center. Since the two pin holes 52A, 52B formed in the joint 44 are formed orthogonal to each other, the male rod 40 and the intermediate rod 38 bend in directions orthogonal to each other. As a result, the male rod 40
Is pivotally connected to the intermediate rod 38 via a joint 44.

During excavation, excavation water is supplied to the inside of the flexible boring rod 30. For this reason, packings 56 and 58 for preventing water leakage are attached to joints between the joint 44 and the male rod 40 and between the joint 44 and the intermediate rod 38.
The packings 56, 58 are attached to the bottoms of the holes 46, 48 in which the joints 44 are fitted, and the contact surfaces 56A, 58A with the joints 44 are formed in a hemispherical shape. On the other hand, both ends of the joint 44 are formed in a hemispherical shape having the same curvature.
The drilling water is prevented from leaking even if the 4 is bent.

At the connection between the intermediate rod 38 and the male rod 40, as shown in FIG. 4, drilling water flows through the flow paths 44A, 44A formed on both sides of the pin holes 52A, 52B.
Water is sent through 44A. A hole 41 penetrates the tip of the male rod 40 to form a water supply passage.

The connection between the intermediate rod 38 and the female rod 42 is also made via a joint 60, and the connection is constructed as follows.

As shown in FIG. 3, the joint 60 is formed in a hollow shape. The rear end of the intermediate rod 38 has a tapered hole 6 into which the front half of the joint 60 is fitted.
2 are formed along the axis. In addition, female rod 4
A tapered hole 64 into which the rear half of the joint 60 is fitted is formed along the axis at the distal end of the joint 2.
The joint 60 is fitted into a hole 62 formed at the rear end of the intermediate rod 38 and a hole 64 formed at the distal end of the female rod 42, and the first pin 66A and the second pin
It is connected with the pin 66B.

That is, two pin holes 68A and 68B orthogonal to each other are formed in the joint 60.
The two pin holes 68A and 68B are aligned with a pin hole 70A formed in the intermediate rod 38 and a pin hole 70B formed in the female rod 42. Then, the first pin 66A and the second pin 66A are inserted into the pin holes 70A and 70B thus aligned.
By fitting the pin 66B, the intermediate rod 38 and the female rod 42 are connected to the joint 44.

The first pin 66A and the second pin 66B are formed so as to be dividable.
And the second pin 50B (see FIG. 4). Further, the first pin 66A and the second pin 66B are not limited to this, and may be inserted by pins using other effective means. The joint 60 may be the same as the joint 44.

By the way, the intermediate rod 38 and the female rod 42 connected to the joint 60 as described above have the first pins 66, respectively, because the holes 62 and 64 in which the joint 60 is fitted are formed in a tapered shape with respect to each other.
A and the second pin 66B are connected so as to be bent around the second pin 66B. Since the pin holes 68A and 68B formed in the joint 60 are formed orthogonal to each other, the intermediate rod 38 and the female rod 42 are bent in directions orthogonal to each other. As a result, the intermediate rod 38
The female rod 42 is swingably connected to the female rod 42 via a joint 44.

Since drilling water is supplied to the inside of the flexible boring rod 30 during excavation, the joint between the female rod 42 and the joint 60 and the joint between the intermediate rod 38 and the joint 60 prevent water leakage. For this purpose, packings 72 and 74 are attached. The packings 72, 74 are attached to the bottoms of the holes 62, 64 in which the joint 60 is fitted, and the contact surfaces 72A, 74A with the joint 60 are formed in a hemispherical shape. On the other hand, both ends of the joint 60 are formed in a hemispherical shape having the same curvature, so that the drilling water does not leak even when the joint 60 is bent.

At the connection between the intermediate rod 38 and the female rod 42, the drilling water is sent through the flow paths 60A, 60A formed on both sides of the pin holes 68A, 68B (see FIG. 3).

The flexible boring rod 30 is constructed as described above. The flexible boring rods 30 are connected to each other by fitting the male rod 40 of the other flexible boring rod 30 into the female rod 42 of one flexible boring rod 30 and connecting pins 80 to the pin holes 76 and 78 formed in the rods. Is carried out.

That is, as shown in FIG. 3, a convex portion 40A is formed at the tip of the male rod 40, and the female rod 4
2 has a concave portion 42A into which the convex portion 40A fits.
Are formed. At the time of connection, the convex portion 40A of the male rod 40 is fitted into the concave portion 42A of the female rod 42. And, a pin hole 76 formed in the male rod 40,
The pin holes 78 formed in the measuring rod 42 are aligned with each other, and the connecting pins 80 are fitted into the pin holes 76 and 78 thus aligned. Thereby, the two flexible boring rods 30 are connected to each other. A spring ring 81 enters the groove of the pin hole 76 of the male rod 40 to prevent the continuous pin 80 from coming off.

In FIG. 3, reference numeral 82 denotes a collar, which prevents the connecting pin 80 from coming off. This color 82
Is formed in a ring shape as shown in FIG. 5, and is partially cut so as to be expandable and contractible. When using,
The female rod 42 is fitted into a groove 42B formed on the outer peripheral portion. At this time, a pair of holes 82A, 82A formed in the collar 82 are fitted with projections 80A, 80A formed at both ends of the connection pin 80. This allows
The connection pin 80 is prevented from coming off.

In FIG. 3, reference numeral 84 denotes an O-ring, which prevents water from leaking from a connection portion between the male rod 40 and the female rod 42.

At the connection between the male rod 40 and the female rod 42, the drilling water is sent through the flow path 41 formed on both sides of the pin hole 76.

In FIG. 1 and FIG. 2, reference numeral 86 denotes a transmitter. By detecting a transmitting point of a radio wave transmitted from the transmitter by a position detector (not shown) installed on the ground, the ground is detected. The position of bit 32 inside is detected.

The operation of the boring apparatus using the flexible boring rod 30 configured as described above is as follows.

First, the flexible boring rod 30
A bit 32 is attached to the tip of the
2 is connected to the drive shaft of the rotary propulsion device 14. And bit 3
2 is in contact with the face.

Next, the propulsion cylinder of the rotary propulsion device 14 is driven to advance the rotary propulsion device main body 16 to apply a thrust to the flexible boring rod 30. At the same time, the hydraulic motor is driven and the flexible boring rod 3
The bit 32 is rotated by applying a rotational force to 0. The flexible boring rod 30 includes the rotating bit 32
The ground is excavated by the teeth 34, 34,.

At this time, drilling water is supplied into the flexible boring rod 30 from a water supply device (not shown), and the supplied drilling water is blown out from the tip of the bit 32 through the inside of the flexible boring rod 30. This facilitates excavation. Even when the drilling water is supplied in this manner, the joints 44, 6
The connection with 0 is sealed by the packings 56, 58, 72, 74 so that no water leaks.

The excavation work is temporarily stopped when the rotary propulsion device body 16 to which the feed has been given as described above reaches the end position of the guide rail 22. Then, the connection between the drive shaft and the flexible boring rod 30 is disconnected.

The rotary propulsion device body 16 having disconnected the connection between the flexible boring rod 30 and the drive shaft once retreats and returns to its original position. Then, a new flexible boring rod 30 is disposed between the rotary propulsion device main body 16 that has returned to the original position and the flexible boring rod 30 that has been previously excavated, and added. At this time, the flexible boring rods 30 are connected together as follows.

First, a pin hole 78 formed in the female rod 42 of one flexible boring rod 30.
And the position of the pin hole 76 formed in the male rod 40 of the other flexible boring rod 30. And the convex part 40 formed in the male rod 40
A is a concave portion 42 formed at the rear end of the female rod 42.
Fit into A. In this state, the pin hole 76 formed in the male rod 40 and the pin hole 78 formed in the female rod 42 are coaxially located.

Next, the connecting pin 80 is fitted into the pin holes 76 and 78. Thereby, the male rod 40 and the female rod 4
2 are connected to each other via a connecting pin 80.

Next, the collar 82 is fitted into the groove 42B formed on the outer periphery of the female rod 42. On this occasion,
The collar 82 is fitted on the outer circumference of the female rod 42 in advance, and after being connected by the connecting pin 80, is slid along the female rod 42 to be fitted into the groove 42B.

The hole 82 formed in the collar 82
A and 82A are previously matched with the positions of the pin holes 78 formed in the measuring rod 42. Thereby, when the collar 82 is fitted into the groove 42B, the connecting pin 80
The protrusions 80A, 80A formed at both ends of the
A, 82A. Thereby, the connecting pin 8
The omission of 0 is prevented.

After the new flexible boring rod 30 is added as described above, excavation is resumed.
In other words, the rotary propulsion device body 16 is advanced to apply thrust to the flexible boring rod 30 and, at the same time, apply torque to the flexible boring rod 30 to rotate the bit 32 and excavate the ground. Then, the excavation proceeds by sequentially adding the flexible boring rods 30 in the same procedure.

As shown in FIG. 1, when a buried object 88 such as a gas pipe is buried in the ground, and it collides with the buried object 88 when excavating by going straight, the digging direction is changed. It needs to be bent. In this case, excavation is performed as follows.

First, the flexible boring rod 30
Pause rotation and propulsion. Next, the direction to be bent and the amount of deviation are detected based on the information from the position detector.
Next, the taper surface 32A of the bit 32 is turned in the direction opposite to the direction in which it should be bent. Next, the propulsion cylinder is driven to propel the flexible boring rod 30. At the same time, the hydraulic motor is driven to swing the bit 32 at a predetermined swing angle.

By excavating in this manner, the ground in the direction to be bent is excavated by the teeth 34 provided on the tip end surface of the bit 32. Also, bit 3
When the bit 32 is propelled with the second tapered surface 32A oriented in the direction opposite to the direction in which it should be bent, the tapered surface 32A of the bit 32 is mounted eccentrically with respect to the ground and the axis. , 34,... Urge the bit 12 in the direction to be bent. At this time, in the flexible boring rod 30 of the present embodiment, the joint between the intermediate rod 38 and the male rod 40 and the female rod 42 is formed by pins 50A, 50B, 66A,
Because they are connected by 66B, they can be bent without difficulty even when excavating an excavation hole with a sharp curvature. In addition, since the male rod 40 and the female rod 42 are swingably connected to each other through the intermediate rod 38 so as to be able to swing 360 °, not only one plane but also the drilling hole can be bent, and the drilling hole follows the drilling hole without difficulty. Can be promoted.

As described above, the curved construction is performed while bending the excavation hole as required. Then, when the bit 32 is exposed on the ground, the excavation operation is completed. After excavation, the bit 32 is removed from the tip of the flexible boring rod 30 and a buried pipe such as a gas pipe to be buried is connected. Then, the flexible boring rod 30 is sequentially pulled out and collected, and a buried pipe such as a connected gas pipe is buried.

As described above, according to the flexible boring rod 30 of the present embodiment, the flexible boring rod 30 can be bent without difficulty even when excavating an excavation hole having a sharp curvature. In addition, the drilling hole can be bent not only in one plane. As a result, in branch works for water supply and gas pipes to individual houses, it is possible to directly pass pipe holes from the vertical shaft attached to the main pipe to the target point in the residential land of the individual house without the need for a reach for horizontal holes. it can.

FIG. 6 is a side sectional view showing the structure of a flexible boring rod according to a second embodiment of the present invention.

As shown in the figure, a flexible boring rod 90 of the present embodiment is configured such that a male rod 92 and a female rod 94 are directly connected to a joint 9 without an intermediate rod.
6. Here, the male rod 92 is flexibly connected to the joint 96 via the first pin 98A, and the female rod 94 is flexibly connected to the joint 96 via the second pin 98B. The first pin 98A and the second pin 98B are disposed so as to be orthogonal to each other. Therefore, male rod 92
Can be bent in two directions perpendicular to the female rod 94, so that the male rod 92
4 can be bent.

Since the configurations of the male rod 92 and the female rod 94 are the same as those of the first embodiment,
Here, the description is omitted.

FIG. 7 is a side sectional view showing the structure of a flexible boring rod according to a third embodiment of the present invention.

In the flexible boring rod 100 of the present embodiment, two intermediate rods 106A and 106B are connected between a male rod 102 and a female rod 104. Here, the intermediate rods 106A and 106B are connected to each other via a joint 108 so as to be bendable. That is, one intermediate rod 106A is flexibly connected to the joint 108 via the first pin 110A, and the other intermediate rod 106B is flexibly connected to the joint 108 via the second pin 110B. . Then, the first pin 110A and the second pin 110
B are arranged so as to be orthogonal to each other. Therefore, the intermediate rods 106A and 106B can bend in two directions orthogonal to each other, and as a result, one intermediate rod 106A can bend with respect to the other intermediate rod 106B. And thereby, it becomes possible to easily excavate even the excavation hole having a steeper curvature. Thus, the number of intermediate rods may be increased as needed. Further, the length may be appropriately changed and used according to the curvature of the hole to be excavated.

The male rod 102 and the female rod 10
Since the configuration of 4 itself is the same as that of the above-described first embodiment, the description thereof is omitted here.

The flexible boring rods 30, 90, 100 of the first to third embodiments described above can be used in appropriate combinations.

[0059]

As described above, according to the present invention,
Since the connecting portion of the rods constituting the flexible boring rod can be bent in two orthogonal directions, the rod can be bent, and thereby the curvature can be excavated. Further, the flexible boring rod can be bent without difficulty even when excavating an excavation hole having a sharp curvature.

[Brief description of the drawings]

FIG. 1 is a side view of a boring apparatus using a flexible boring rod.

FIG. 2 is a side sectional view showing the configuration of a flexible boring rod (when connected).

FIG. 3 is a side sectional view showing a configuration of a flexible boring rod.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is a side sectional view showing a configuration of a flexible boring rod according to a second embodiment.

FIG. 7 is a side sectional view showing a configuration of a flexible boring rod according to a third embodiment.

[Explanation of symbols]

14 ... rotary propulsion device, 16 ... rotary propulsion device main body, 30 ...
Flexible boring rod, 32 ... bits, 38 ...
Intermediate rod, 40: male rod, 42: female rod, 4
4 Joint, 50A First pin, 50B Second pin, 52A, 52B Pin hole, 54A, 54B Pin hole, 56, 58 Packing, 60 Joint, 66A
... 1st pin, 66B ... 2nd pin, 68A, 68B ... pin hole, 70A, 70B ... pin hole, 72, 74 ... packing,
76, 78 ... pin hole, 80 ... connecting pin, 82 ... collar,
84 ... O-ring, 86 ... Transmitter, 88 ... Buried object, 90 ...
Flexible boring rod, 92 ... male rod, 9
4 female rod, 96 joint, 98A first pin, 98B second pin, 100 flexible boring rod, 102 male rod, 104 female rod,
106A, 106B: middle rod, 108: joint, 110A: first pin, 110B: second pin

Claims (3)

[Claims] 1. A flexible boring rod that can be sequentially connected, comprising: a male rod having a convex portion at a distal end; a female rod having a concave portion at a distal end to be fitted with a convex portion of the male rod; A flexible boring rod, the other end of which is flexibly connected to the female rod via a pin, and the other end of which is flexibly connected in a direction perpendicular to the bending direction via a pin. . 2. A flexible boring rod which can be sequentially connected, comprising: a male rod having a convex portion at a distal end; a female rod having a concave portion at a distal end to be fitted to a convex portion of the male rod; and a flexible rod disposed between the male rod and the female rod. An intermediate rod to be provided, one end of which is flexibly connected to the base end of the male rod via a pin, and the other end of which is bent to one end of the intermediate rod via a pin in a direction orthogonal to the bending direction. A first joint operatively connected to the base end of the female rod via a pin so as to be bendable, and the other end orthogonal to the bending direction via a pin to the other end of the intermediate rod. And a second joint connected to bendable in a direction. 3. The flexible boring rod,
3. The flexible boring rod according to claim 1, wherein the flexible boring rod is formed in a hollow shape, and is provided with packing at a joint portion of the joint, and is capable of supplying water.