JP2019217600A - Drilling method, drilling device and drilling attachment for regeneration pipe - Google Patents

Abstract

To facilitate pull-out work of a drilling tool after a communication hole is formed by external drilling on a regeneration pipe.SOLUTION: The invention is configured to drill a communication hole 3a with a branch pipe 2, using a regeneration pipe drilling device 10, on a regeneration pipe 3 subjected to lining to an inner periphery of an existing pipe 1, and couple a drilling tool 40 to a tip of a flexible strip body 20 which can transmit a rotary torque on the regeneration pipe drilling device 10. At the time, a drilling tool 40 is made in an eccentric state to a tip part of the flexible strip body 20. The flexible strip body 20 is inserted into the branch pipe 2, for making the drilling tool 40 reach the regeneration pipe 3 and introducing the rotary torque.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method of drilling a communication port with a branch pipe in a rehabilitated pipe lined to an existing pipe, and more particularly to a method of drilling a rehabilitated pipe externally from a branch pipe side.

A method for rehabilitating an existing pipe by lining the rehabilitation pipe on the inner circumference of an existing pipe such as an aged sewer pipe is known.
In many cases, a branch pipe such as an attachment pipe is connected to the peripheral side of the existing pipe. For this reason, it is necessary to drill a communication port with the branch pipe in the rehabilitation pipe.
For example, in an external drilling device disclosed in Patent Document 1, a cylindrical drilling tool is attached to a distal end portion of a flexible strip capable of transmitting rotational torque. The drilling tool and the flexible strip are inserted into the branch pipe from the ground side to allow the drilling tool to reach the rehabilitation pipe, and the drilling tool is rotated by introducing rotational torque to the flexible strip. . Thereby, the rehabilitation pipe is externally drilled from the outer peripheral side to form a communication port.

JP 2011-025364 A

In this type of external drilling method, after drilling, it is necessary to pull out the flexible strip and the drilling tool toward the branch pipe. However, the drilling tool is easily caught by the drilled communication port, and the drawing operation is not easy. In particular, when the retreat angle of the drilling tool at the time of withdrawal is different from the advance angle of the drilling tool at the time of drilling, catching is likely to occur. That is, when drilling, the drilling tool hits the outer surface of the rehabilitation pipe at an angle almost perpendicular to the hole, and drilling proceeds at that angle. There is a case where the retreat is performed so as to be pulled along the angle of the attachment pipe (branch pipe), and when the retreat is performed, it is easy to be caught.
In view of such circumstances, an object of the present invention is to facilitate the work of pulling out a drilling tool after forming a communication port in a rehabilitation pipe by external drilling.

In order to solve the above-mentioned problem, a method of the present invention is to rehabilitate a rehabilitated pipe lined on the inner periphery of an existing pipe by using a rehabilitating pipe drilling device to drill a communication port with a branch pipe connected to the existing pipe. A pipe drilling method,
A drilling tool is eccentrically connected to the distal end of the flexible strip, which is capable of transmitting a rotational torque in the rehabilitating pipe drilling device,
The flexible strip is inserted into the branch pipe so that the drilling tool reaches the rehabilitating pipe, and the drilling is performed by introducing the rotational torque.
The rotating torque causes the drilling tool to rotate about the axis of the distal end of the flexible strip. Thereby, the rehabilitation pipe is externally drilled from the outer peripheral side, and a communication port is formed. Since the center of rotation of the drilling tool (that is, the axis of the distal end of the flexible strip) is eccentric with respect to the axis of the drilling tool, the communication port has a larger diameter than the drilling tool. Therefore, after drilling, it becomes easy to pull out the drilling tool from the communication port toward the mounting pipe. Even if the regression angle of the drilling tool at the time of pulling is different from the advance angle of the drilling tool at the time of drilling, the communication port is formed with a diameter larger than that of the drilling tool, so that catching at the time of retreating It is difficult to get up and the drilling tool can be pulled out smoothly.

The device of the present invention is a rehabilitating pipe drilling device for forming a communication port with a branch pipe connected to the existing pipe in a rehabilitating pipe lined on the inner periphery of the existing pipe,
A flexible strip capable of transmitting rotational torque;
A drilling tool connected to the distal end of the flexible strip and rotated by the rotating torque,
Wherein the drilling tool is eccentric with respect to the tip of the flexible strip.
In this device, a flexible strip is inserted into a branch pipe so that a drilling tool reaches a rehabilitation pipe, and a rotational torque is introduced into the flexible strip. The rotational torque is transmitted to the drilling tool, and the drilling tool is rotated around the axis of the distal end of the flexible strip. Thereby, the rehabilitation pipe is drilled from the outer peripheral side to form a communication port. Due to the eccentricity, the communication port becomes larger in diameter than the drilling tool. Therefore, after drilling, it becomes easy to pull out the drilling tool from the communication port toward the mounting pipe. Even if the retreat angle of the drilling tool at the time of removal differs from the advance angle of the drilling tool at the time of drilling, the drilling tool can be smoothly pulled out.

Further, the present invention is a rehabilitation pipe drilling attachment for a rehabilitation pipe drilling device for forming a communication port with a branch pipe connected to the existing pipe in a rehabilitation pipe lined on the inner periphery of the existing pipe,
In the rehabilitating pipe drilling device, a connecting member that is connected to a distal end portion of a flexible strip capable of transmitting a rotating torque,
A drilling tool connected to the connecting member so as to be eccentric with respect to the tip of the flexible strip,
It is characterized by having.
According to the attachment, the drilling tool is connected to the connecting member, and the distal end of the flexible strip is connected to the connecting member. As a result, the distal end portion of the flexible strip and the drilling tool are connected via the connecting member and are eccentric to each other. As a result, a communication port having a diameter larger than that of the drilling tool can be drilled, and after drilling, the drilling tool can be easily pulled out from the communication port to the mounting pipe side.

The connecting member has a strip connecting part to which a tip end of the flexible strip is connected, and a tool connecting part to which the drilling tool is connected, and the tool connecting part is the strip connecting part. Is preferably eccentric with respect to.
According to the attachment, the drilling tool is made flexible by connecting the tool connecting portion of the connecting member to the drilling tool, and connecting the strip connecting portion of the connecting member to the distal end of the flexible strip. The eccentric body can be made to be eccentric by a predetermined amount with respect to the distal end portion.

Preferably, the eccentric amount is 1 mm or less. More preferably, the eccentric amount is 0.5 mm to 1 mm.
By setting the eccentric amount to 1 mm or less, it is possible to prevent the drilling tool from being violent. By setting it to 0.5 mm or more, it is possible to ensure the ease of pulling out the drilling tool after drilling.

The drilling tool includes a cylindrical tool body, a blade provided at a tip of the tool body, and a connection receiver provided on a side opposite to the tip of the tool body and connected to the connection member. It is preferable to include a portion and an abrasive provided on the outer peripheral surface of the tool main body.
According to the drilling tool, a communication port is formed in the rehabilitation pipe by the blade portion, and the diameter of the communication port can be increased by grinding the inner peripheral surface of the communication port with an abrasive. Thereby, the drilling tool after drilling can be more easily pulled out.
Preferably, the thickness of the abrasive is 2 mm or less. This can prevent the resistance during grinding from becoming excessive.

  According to the present invention, the drilling tool can be easily pulled out after the communication hole is formed in the rehabilitation pipe by external drilling.

FIG. 1 is a cross-sectional view showing a state in which a communication port with a branch pipe is formed in a rehabilitating pipe using the rehabilitating pipe drilling device according to the first embodiment of the present invention. FIG. 2 is a front view of the rehabilitating pipe drilling device. FIG. 3 is a front view of a drilling attachment of the rehabilitating pipe drilling device. FIG. 4 is an exploded front view of the drilling attachment. FIG. 5 is an explanatory plan view showing a state of drilling by the rehabilitating pipe drilling device. FIG. 6 is an enlarged view of the circle VI of FIG. FIG. 7 shows a second embodiment of the present invention and is a front view of a drilling attachment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the existing pipe 1 to be rehabilitated is a sewer pipe buried underground. An attachment pipe 2 (branch pipe) is obliquely connected to an outer peripheral portion of an existing pipe 1 which is a main pipe. The port on the ground side of the mounting pipe 2 is connected to the box 4.

  The deteriorated existing pipe 1 is rehabilitated by the rehabilitation pipe 3. The rehabilitation pipe 3 is lined on the inner circumference of the existing pipe 1. The rehabilitation pipe 3 of the present embodiment is a synthetic resin pipe made of an olefin resin such as a vinyl chloride resin or polyethylene, or another thermoplastic resin. The rehabilitation pipe 3 has a circular cross section, but is produced in a state where one side in the circumferential direction is depressed and flattened in a manufacturing process. After being transported into the existing pipe 1 with the flat shape, the shape is restored to a circular cross-section by heating, and furthermore, it is brought into close contact with the inner wall of the existing pipe 1 by being pressurized and expanded.

By the lining process of the rehabilitation pipe 3, the connecting portion 2 a between the existing pipe 1 and the attachment pipe 2 is closed by the pipe wall of the rehabilitation pipe 3.
As shown in FIG. 1, after the lining step, rehabilitating pipe drilling devices 5 and 10 are prepared. A communication port 3 a is formed in the pipe wall of the rehabilitation pipe 3 by the rehabilitation pipe drilling devices 5 and 10. The communication port 3a communicates with the attachment pipe 2, and the internal flow path of the rehabilitation pipe 3 communicates with the attachment pipe 2 via the communication port 3a.

A rehabilitating pipe drilling device 5 indicated by a two-dot chain line in FIG. 1 is an internal drilling machine for drilling from the inside of the rehabilitating pipe 3.
A rehabilitating pipe drilling device 10 shown by a solid line in FIG. 1 is an external drilling machine for drilling from the outside of the rehabilitating pipe 3. In the present embodiment, drilling is performed by at least the rehabilitating pipe drilling device 10.

As shown in FIG. 2, the rehabilitating pipe drilling device 10 includes a device main body 11, a flexible strip 20, and a rehabilitating pipe drilling attachment 30.
A drive motor 12 is housed in a housing 11a of the apparatus main body 11.

  A flexible strip 20 extends from the device body 11. The flexible strip 20 has flexibility (flexibility) and is freely deformable. As shown in FIG. 1, the outer diameter of the flexible strip 20 is large enough to be inserted into the mounting tube 2. The length of the flexible strip 20 is at least as long as the length of the mounting tube 2.

As shown in FIG. 2, the flexible strip 20 includes a flexible (flexible) guide tube 21 and a flexible (flexible) torque transmission wire 22. A torque transmission wire 22 is housed inside the guide tube 21. The proximal end of the guide tube 21 is fixed to the housing 11a. The proximal end of the torque transmission wire 22 is connected to the output shaft of the drive motor 12 via a connector 23. In the guide tube 21, the torque transmission wire 22 is rotatable around its own axis. The torque transmitting wire 22 and thus the flexible strip 20 can transmit the rotational torque introduced from the drive motor 12 to the distal end side.
A pin-shaped tip connector 24 is provided at the tip of the torque transmission wire 22.

As shown in FIG. 3, a rehabilitating pipe drilling attachment 30 is detachably connected to the distal end of the flexible strip 20. As shown in FIG. 4, the rehabilitating pipe drilling attachment 30 includes a connecting member 31, a tool holder 32, and a drilling tool 40. The connecting member 31 is a screw-shaped member integrally having a head portion 31a and a tool connecting portion 31b formed of a male screw. At the center of the head 31a, a strip connecting portion 31c formed of a concave portion or a hole having a circular cross section is formed. The axis L ₂ passing through the central axis of the head 31a, and the axis L ₁ of the central axis of the strip body connecting portion 31c passes are parallel and eccentric to each other.

As shown in FIG. 3, the distal end connector 24 of the flexible strip 20 is fitted into the strip connection portion 31c. Tip connector 24 is disposed on the same strip-body connection portion 31c axis L _1. The distal end connector 24 and the connecting member 31 are non-rotatably and detachably connected to each other by a transverse bolt 25. The transverse bolt 25 penetrates the head 31a and the distal end connector 24 in the diameter direction, and is tightened by the double nut 26.
In place of the transverse bolt 25 and the double nut 26, a pin is passed through in the diameter direction of the head 31a and the tip connector 24, and the pin is prevented from coming off by surrounding the periphery of the head 31a with a retaining ring. Is also good.

As shown in FIG. 4, the tool connecting portion 31b made of a male screw protrudes from the head portion 31a and thus the strip connecting portion 31c toward the distal end (downward in FIG. 4). Tool connecting portion 31b is disposed on the head 31a and the same axis L _2, and is eccentric with respect to strip body connecting portion 31c.

  As shown in FIGS. 3 and 4, the tool holder 32 is formed in a substantially disk shape. A central hole 32c is formed through the center of the tool holder 32. The inner diameter of the center hole 32c is larger than the outer diameter of the thread of the tool connecting portion 31b made of a male screw and smaller than the outer diameter of the head 31a. The tool connecting portion 31b is inserted through the center hole 32c.

A rounded portion 32 d is formed on the peripheral side of the tool holder 32. The rounded portion 32d has a partially spherical shape or an R shape whose diameter decreases toward the flexible strip 20 (the side opposite to the distal end side (the upper side in FIG. 3)).
On the tip end surface (lower side in FIG. 3) of the tool holder 32, a shallow concave tool holder 32a is formed.

A drilling tool 40 is provided on the tip side (the lower side in FIG. 3) of the tool holder 32.
The drilling tool 40 includes a tool body 41, a connection receiving part 42, and a blade part 43. The tool main body 41 has a cylindrical shape. The effective shaft length of the tool body 41, and thus the effective length of the drilling tool 40, is about 1.1 to 1.2 times the standard shaft length. For example, while the effective length of a standard tool body having a diameter of 80 mm is 38 mm, the effective length L ₄₁ of the tool body 41 of the present embodiment is about L ₄₁ = 44 mm. As shown in FIG. 3, the effective length L ₄₁ of the tool body 41 refers to a distance from the leading edge of the tool holder 32 to the leading edge of the tool body 41.

As shown in FIG. 4, a connection receiving portion 42 is provided at the center of the surface of the tool main body 41 on the side of the flexible strip 20 (the side opposite to the distal end side (the upper side in FIG. 3)). The connection receiving portion 42 is configured by a female screw hole coaxial with the tool main body 41.
As shown in FIG. 3, a tool connecting portion 31b of the connecting member 31 formed of a male screw penetrates the center hole 32c of the tool holder 32 and is screwed into a connection receiving portion 42 formed of a female screw hole. Thus, the drilling tool 40 is detachably fixed to the connecting member 31.
A tool holder 32 is held between the head 31 a of the connecting member 31 and the drilling tool 40.

A blade portion 43 is provided at a tip portion (lower portion in FIG. 3) of the tool main body 41. The blade 43 includes, for example, a saw blade 43a. The saw blade portion 43a is provided in an annular shape along the outer peripheral edge of the tip portion of the tool main body 41.
Furthermore, (not shown) around the drill constituting the blade portion 43 on the axis L ₂ of the drilling tool 40 may be provided with. From the viewpoint of securing a good eccentric effect, it is preferable to omit the center drill.

As shown by a hatched pattern in FIG. 4, the drilling tool 40 is further provided with an abrasive 44. The abrasive 44 is made of ultra-hard particles, and is coated on the outer peripheral surface of the tool body 41 by vapor deposition or the like.
As shown in FIG. 5, the abrasive 44 is disposed on a part of the drilling tool 40 in the circumferential direction. Preferably, the arrangement portion of the abrasive 44 is the most distant parts 40p and the periphery thereof is a distance from the rotational axis L ₁ in the circumferential direction of the drilling tool 40.
The abrasive 44 may be provided over the entire outer peripheral surface of the drilling tool 40.
The thickness of the abrasive 44 is preferably about 2 mm or less. If it is too thick, the grinding resistance will be excessive. The thickness of the abrasive 44 in FIG. 5 is exaggerated with respect to the diameter of the drilling tool 40.

As shown in FIG. 3, drilling tool 40 is disposed on the tool connecting part 31b and the same axis L ₂ of the connecting member 30 of the eccentric structure. Therefore, the axis L ₂ of the drilling tool 40 is eccentric only parallel and eccentric amount d with respect to the axis L ₁ that is, the rotational center axis of the tip connector 24.

The eccentricity d between the axes L ₁ and L ₂ is preferably 1 mm or less, and more preferably d = 0.5 mm to 1 mm.
By setting d ≦ 1 mm, it is possible to prevent the drilling tool from being violent. By setting d ≧ 0.5 mm, it is possible to ensure the ease of pulling out the drilling attachment 30 and, eventually, the drilling tool 40 after drilling.

<Drilling method for communication port 3a>
The communication port 3a is formed in the rehabilitation pipe 3 by using the rehabilitation pipe drilling device 10 as follows.
First, the drilling attachment 30 is connected to the distal end connector 24 of the flexible strip 20 in the rehabilitating pipe drilling device 10. Since the connecting member 31 for connection has an eccentric structure, the drilling tool 40 of the drilling attachment 30 and the distal end connector 24 are eccentric to each other by the connecting operation.
Next, as shown in FIG. 1, the flexible strip 20 with the drilling attachment 30 is inserted into the mounting pipe 2 from the box 4, and the drilling tool 40 reaches the rehabilitation pipe 3. Further, the camera 6 is inserted into the vicinity of the drilling tool 40 in the mounting pipe 2.
By driving the drive motor 12 while checking the photographing screen of the camera 6 on a monitor (not shown), a rotational torque is introduced into the flexible strip 20 to rotate the torque transmission wire 22. By transmitting the rotation torque to the drilling attachment 30, the drilling attachment 30 is rotated, and thus the drilling tool 40 is rotated.

By the rotation of the drilling tool 40, the rehabilitating pipe 3 is drilled from the outer peripheral side, and the communication port 3a is formed. At this time, as shown in FIG. 5, drilling tool 40 is rotated around the axis L ₁ which is eccentric relative to the axis L ₂ of the drilling tool 40 itself. For this reason, the communication port 3a has a larger diameter than the drilling tool 40.
The eccentricity d in FIG. 5 is exaggerated with respect to the diameter of the drilling tool 40.

  Drilling is mainly performed by the blade portion 43 of the drilling tool 40. Furthermore, when the tool main body 41 comes to face the inner peripheral surface of the communication port 3a, the abrasive 44 rubs against the inner peripheral surface of the communication port 3a, so that the inner peripheral surface of the communication port 3a is ground. . Thereby, the diameter of the communication port 3a can be further increased.

As shown in FIGS. 1 and 6, depending on the angle of the mounting pipe 2 with respect to the existing pipe 2, the drilling tool 40 enters the rehabilitation pipe 3 obliquely. Even in this case, by increasing the effective length L ₄₁ (FIG. 3) of the drilling tool 40, the drilling tool 40 can surely penetrate the pipe wall of the rehabilitation pipe 3, and the communication port 3 a can be opened. It can be formed reliably.
Preferably, the drilling tool 40 is idled for a while after the drilling tool 40 has penetrated the pipe wall of the rehabilitation pipe 3. More preferably, it is idled for at least one minute. Thereby, the diameter of the communication port 3a can be reliably increased.
As shown in FIG. 1, preferably, an internal drilling machine 5 is arranged in the rehabilitation pipe 3 to perform internal drilling in parallel with an external drilling step by the rehabilitating pipe drilling device 10. Thereby, the construction period can be shortened.

After the formation of the communication port 3a, the camera 6 is pulled out. Subsequently, the drilling tool 40 is pulled out from the communication port 3a to the mounting pipe 2 side. Since the diameter of the communication port 3a is larger than that of the drilling tool 40 by at least the amount of eccentricity d, the frictional resistance between the inner peripheral surface of the communication port 3a and the drilling tool 40 can be reduced, and drilling can be performed. The tool 40 can be easily pulled out from the communication port 3a. In addition, since the communication port 3a is further enlarged by the grinding of the abrasive 44, the ease of pulling out can be further improved.
At the time of drilling, the blade portion 43 of the drilling tool 40 strikes the outer surface of the rehabilitating pipe 3 at an angle almost perpendicular to the hole, and drilling proceeds at that angle. Even if it is to be retreated obliquely because it is pulled along the angle of 2, the communication port 3a is formed to have a larger diameter than the drilling tool 40, so that it is difficult for catching to occur during retreat. The drilling tool 40 can be easily pulled out.
Further, even if the tool holder 32 hits a step such as the connection portion 2a, the drilling attachment 30 can be smoothly pulled out by the guide action of the round portion 32a.

Next, another embodiment of the present invention will be described. In the following embodiments, the same components as those described above are denoted by the same reference numerals in the drawings, and description thereof will be omitted.
<Second embodiment>
FIG. 7 shows a second embodiment of the present invention.
In the drilling attachment 30B of FIG. 7, the surface of the tool holder 32 on the side of the flexible strip 20 (the side opposite to the distal end side, the upper side in the figure) becomes a conical surface 32e instead of the rounded portion 32a. ing.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, the existing pipe 1 is not limited to a sewer pipe, but may be a water pipe, an agricultural water pipe, a hydraulic power transmission pipe, a gas pipe, or the like.
The rehabilitation pipe 3 is not limited to the synthetic resin pipe, and may be a spiral pipe formed by spirally forming a belt-shaped member (profile), and is formed by connecting annular or partially annular segments in a tubular manner. Is also good.

  INDUSTRIAL APPLICATION This invention is applicable to the rehabilitation of the sewer pipe buried underground, for example.

1 Existing pipe 2 Mounting pipe (branch pipe)
2a Connection part 3 Rehabilitation pipe 3a Communication port 4 Masu 5 Internal drilling machine 10 Rehabilitation pipe drilling device 11 Main body 11a Housing 12 Drive motor 20 Flexible strip 21 Guide tube 22 Torque transmission wire 23 Hand side connector 24 Tip connector (The tip of the flexible strip)
25 Transverse bolt 26 Double nut 30, 30B Rehabilitation pipe drilling attachment 31 Connecting member 31a Head 31b Tool connecting part 31c Strip connecting part 32 Tool holder 32a Tool holding part 32c Center hole 32d Round part 32e Conical surface 40 Drilling tool 41 Tool body 42 Connection receiving portion 43 Blade portion 43a Saw blade portion 44 Abrasive material d Eccentricity L ₁ Axis line L at the tip of flexible strip ₂ Axis line of drilling tool

Claims (7)

A rehabilitation pipe drilling method for drilling a communication port with a branch pipe connected to the existing pipe, using a rehabilitation pipe drilling device, for the rehabilitation pipe lined on the inner circumference of the existing pipe,
A drilling tool is eccentrically connected to the distal end of the flexible strip, which is capable of transmitting a rotational torque in the rehabilitating pipe drilling device,
A method for drilling a rehabilitated pipe, wherein the flexible strip is inserted into the branch pipe, the drilling tool reaches the rehabilitating pipe, and the drilling is performed by introducing the rotational torque. A rehabilitating pipe drilling device for forming a communication port with a branch pipe connected to the existing pipe in a rehabilitating pipe lined on the inner periphery of the existing pipe,
A flexible strip capable of transmitting rotational torque;
A drilling tool connected to the distal end of the flexible strip and rotated by the rotating torque,
Wherein the drilling tool is eccentric with respect to the tip of the flexible strip. A rehabilitation pipe drilling attachment for a rehabilitation pipe drilling device that forms a communication port with a branch pipe connected to the existing pipe in a rehabilitation pipe lined on the inner circumference of the existing pipe,
In the rehabilitating pipe drilling device, a connecting member that is connected to a distal end portion of a flexible strip capable of transmitting a rotating torque,
A drilling tool connected to the connecting member so as to be eccentric with respect to the tip of the flexible strip,
Rehabilitation pipe drilling attachment characterized by comprising:   The connecting member has a strip connecting part to which a tip end of the flexible strip is connected, and a tool connecting part to which the drilling tool is connected, and the tool connecting part is the strip connecting part. The rehabilitating pipe drilling attachment according to claim 3, wherein the attachment is eccentric to the pipe.   The rehabilitation pipe drilling attachment according to claim 3 or 4, wherein the eccentric amount is 1 mm or less.   The rehabilitation pipe drilling attachment according to any one of claims 3 to 5, wherein the eccentric amount is 0.5 mm to 1 mm.   The drilling tool includes a cylindrical tool body, a blade provided at a tip of the tool body, and a connection receiver provided on a side opposite to the tip of the tool body and connected to the connection member. The rehabilitated pipe drilling attachment according to any one of claims 3 to 6, further comprising a portion and an abrasive provided on an outer peripheral surface of the tool main body.

Images