JP7280076B2 - Pipe line cutting jig and pipe line cutting method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline cutting jig and a pipeline cutting method, and more particularly to a pipeline cutting jig and a pipeline cutting method for cutting a pipe wall of a pipeline from the inner surface side in the pipe axial direction.

Conventionally, as a pipe line cutting jig for cutting a pipe wall of a pipe line (for example, a gas pipe) along the pipe axial direction from the inner surface side, for example, a cutting/expanding tool described in Patent Document 1 is known. there is

The cutting/expanding tool of Patent Document 1 is mainly used in a non-cutting jacking method (pipe splitter method),
(a) a bearing rod (body);
(b) "three" guide rollers (guide rollers) mounted in tandem along the longitudinal axis of the bearing rod on the guide surface side of the bearing rod;
(c) "four" cutter wheels mounted between a plurality of guide rollers on the cut side of the bearing rod;
is provided.

According to such a cutting/opening tool, the guide roller provided on the side opposite to the insertion end follows the guide groove formed by the guide roller on the insertion end side. It is possible to suppress rotational movement in the pipeline during cutting of the channel.

Patent No. 3217403

By the way, in the pipeline cutting jig used in the pipe splitter construction method, a plurality of cutter wheels are arranged such that the diameter increases toward the opposite insertion end side, like the cutting and expanding tool of Patent Document 1. They are generally installed side by side.

this is,
(a) First, a thin portion (for example, the pipe wall of the pipe) is cut step by step with a “small diameter” cutter wheel provided on the insertion end side.
(b) After that, a "large diameter" cutter wheel provided on the side opposite to the insertion end cuts the thick part (for example, joints) step by step.
This is because the pipeline can be cut relatively smoothly without imposing an excessive load on the pulling device (for example, a hydraulic pushing/pulling device).

However, in particular, when cutting a thick portion (for example, joints) with a "large diameter" cutter wheel on the side opposite to the insertion end, the guide roller arranged on the "guide side" has a radially inner side. Since a large reaction force acts on the shaft, its rotational behavior tends to be unstable.

That is, even if the guide roller on the non-insertion end side follows the guide groove as in the cutting/expanding tool of Patent Document 1, the "large diameter" cutter wheel on the non-insertion end side (the non-insertion end side When cutting a thick part with "two" cutter wheels), there is a possibility of derailment (out of the guide groove). I could have lost it.
In addition, such an event occurs when cutting a thin portion of the pipe wall (e.g., corrosion due to aging deterioration) with a cutter wheel, or when a traction device (e.g., hydraulic cylinder) is used to pull the cutting/expanding tool into the pipe line. It is assumed that the same occurs in the case (at the time of initial movement of the cutting/spreading tool) as well.

In light of these points, it can be said that the cutting/expanding tool of Patent Document 1 still has room for improvement.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and an object of the present invention is to provide a pipeline cutting jig capable of effectively suppressing rotational movement within a pipeline during cutting of a pipe wall. and to provide a pipeline cutting method.

According to the pipeline cutting jig according to the present invention, there is provided a main body that can be inserted into a pipeline; A pipeline comprising a plurality of cutter members arranged side by side, and a plurality of guide wheels rotatably provided on the main body and protruding from the outer surface of the main body in a second direction opposite to the first direction. In the cutting jig, the plurality of guide wheels includes a first guide wheel provided closer to the insertion end side of the main body than the plurality of cutter members, and the cutter member positioned closest to the insertion end side of the main body. and a second guide wheel different from the first guide wheel provided between the cutter member positioned farthest from the insertion end, wherein the first guide wheel and the second guide wheel are respectively and a pair of rotating members in contact with the inner surface of the pipeline, wherein the inclination angle of the axis of one of the rotating members with respect to the axis of the other rotating member is greater than that of the first guide wheel. is greater than .

Further, according to the pipe line cutting method of the present invention, a main body that can be inserted into a pipe line; and a plurality of guide wheels rotatably provided on the main body and projecting from the outer surface of the main body in a second direction opposite to the first direction. A pipeline cutting method for cutting the pipeline using a pipeline cutting jig, wherein the plurality of guide wheels are a first guide wheel provided closer to the insertion end side of the main body than the plurality of cutter members. and a second guide wheel different from the first guide wheel provided between the cutter member positioned closest to the insertion end of the main body and the cutter member positioned farthest away from the insertion end of the main body. , the first guide wheel and the second guide wheel each have a pair of rotating members in contact with the inner surface of the pipeline, and the inclination of the axis of one of the rotating members with respect to the axis of the other rotating member The angle of the first guide wheel is larger than that of the second guide wheel. and a guide wheel contacting step of bringing the second guide wheel into contact with the inner surface of the pipeline, and after performing the guide wheel contacting step, the pipeline cutting jig is further moved in the insertion direction to form a plurality of the cutter members. and a pipe line cutting step of cutting the pipe wall of the pipe line in the pipe axial direction.

It should be noted that the term "pipe line" as used herein is not limited to gas-flowing pipes (e.g., gas pipes) or liquid-flowing pipes (e.g., water supply pipes, drain pipes, and oil pipes). It also means a wide range of conduits (for example, electrical conduits) through which electricity does not flow.

In addition, the above-mentioned "pipe line cutting jig" is limited to those used in the so-called pipe splitter construction method in which a new pipe line (for example, a polyethylene pipe (PE pipe)) is pulled in at the same time as the existing pipe line (steel pipe) is cut open. It does not mean that it is used to cut a pipe line, but also includes those that are used to cut a pipeline.

In the present invention having the above configuration, the tilt angle between the axis of one rotating member and the axis of the other rotating member is relatively large. A "first guide wheel" provided with a pair of "rotating members" protruding in the same manner as above) is arranged closer to the insertion end side of the main body than the plurality of "cutter members".

That is, in the above configuration, the insertion end side of the main body can be satisfactorily gripped on the pipe wall of the pipe through the "first guide wheel", so that the pipe cutting jig can rotate and move in the pipe. can be effectively suppressed.

Further, in the above configuration, the "second guide wheel" (e.g., a pair of "rotating members is disposed between the "cutter member" located closest to the insertion end side of the main body and the "cutter member" located closest to the opposite insertion end side.

That is, in the above configuration, since a pair of "rotating members" having a relatively small angle of inclination can be provided on the side opposite to the insertion end of the main body where a large reaction force tends to act, the reaction force can be reduced to "two pieces". It is possible to disperse and receive by the rotating body.
As a result, in the above configuration, even if a large reaction force acts on the "guide wheel" on the insertion end side, it is possible to mitigate (reduce) the influence on the rotation behavior of each "rotating member". As a result, it is possible to stably move the pipeline cutting jig straight in the pipeline.

In summary, in the above configuration, it is possible to allow the pipe line cutting jig to travel straight while effectively suppressing rotational movement within the pipe line.

In addition, in the above invention relating to the pipeline cutting jig, it is preferable that the first guide wheel is provided so that the pair of rotating members radially protrude from the outer surface of the main body.

Further, in the above-described pipe line cutting jig, it is preferable that the second guide wheel is arranged so that the axis of one of the rotating members and the axis of the other of the rotating members are parallel to each other. be. In this case, in the second guide wheel, it is more preferable that the axis of one of the rotating members and the axis of the other rotating member are arranged on the same axis.

Furthermore, in the above-described invention relating to the pipe line cutting jig, it is preferable that the rotating member has a radially outer tip formed at an acute angle.

As described above, according to the pipeline cutting jig according to the present invention, although it has a simple structure, it can be made to travel stably straight while effectively suppressing rotational movement in the pipeline. .

FIG. 4 is an explanatory diagram for explaining a pipeline cutting method using the pipeline cutting and expanding tool according to the present embodiment; FIG. 2 is a schematic diagram for explaining the conduit cutting expander of FIG. 1; FIG. 3 is a side view and a cross-sectional view of a pipeline cutting jig that constitutes the pipeline cutting and expanding tool of FIG. 2; FIG. 2 is a flow chart for explaining the pipeline cutting method of FIG. 1; 1 is a schematic diagram of a test pipeline used when testing the performance of a pipeline cutting jig; FIG. FIG. 5 is a diagram showing test results when a test was conducted using a pipeline cutting jig according to the present embodiment and a pipeline cutting tool as a comparative example;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram for explaining a pipeline cutting method using a pipeline cutting and expanding tool according to the present embodiment, and FIG. 2 is a schematic diagram for explaining the pipeline cutting and expanding tool of FIG. 3 is a side view and cross-sectional view of a pipe cutting jig for steel-making the pipe cutting expander of FIG. 2, FIG. 4 is a flowchart for explaining the pipe cutting method of FIG. 1, and FIG. A schematic diagram of a test pipeline used when testing the performance of the pipeline cutting jig, FIG. 6 shows a pipeline cutting jig according to this embodiment and a pipeline cutting tool as a comparative example. FIG. 10 is a diagram showing actual test results;

Figure 1 shows an existing pipeline P1 (e.g., iron pipe with a nominal diameter of 50A) to a new pipeline P2 (e.g., polyethylene pipe (PE pipe) with a nominal diameter of 50A) using the so-called pipe splitter method (non-open-cut method). It shows how it is exchanged. Note that the existing pipeline P1 corresponds to the "pipe line" described in the claims.

Since the pipe splitter construction method itself is now known, a detailed description thereof will be omitted. However, in order to facilitate understanding of the present embodiment, this construction method will be briefly described with reference to FIG.

As shown in FIG. 1, the exchange of the existing pipeline P1 for the new pipeline P2 according to this embodiment is similar to the conventional pipe splitter construction method.
(a) excavate both ends of the construction section to provide a starting shaft V1 and an arrival shaft V2;
(b) removing the existing pipeline P1 in each of the departure shaft V1 and the arrival shaft V2;
(c) Install a push-pull device D such as a hydraulic type in the starting shaft V1,
(d) Driving the push/pull device D to add rods R and sequentially send them into the existing pipeline P1;
(e) Connect the pipe line cutting and expanding tool 1 to the rod R sent up to the arrival shaft V2, and connect the new pipe line P2 to this pipe line cutting and expanding tool 1;
(f) Driving the pushing/pulling device D to draw the pipe line cutting expander 1 and the new pipe line P2 toward the starting shaft V1;
This is done by following the steps of

Although details will be described later, in the present embodiment, the push-pull device D pulls the pipe line cutting expander 1 and the new pipe line P2 (operation (f) above) to move the existing pipe line toward the starting shaft V1. The new pipeline P2 is laid along the existing pipeline P1 at the same time when the pipeline P1 is cut open in the direction of the pipe axis.

(Structure of pipe line cutting and expanding tool 1)
Next, the conduit cutting expander 1 will be described with reference to FIGS. 1 and 2. FIG.
As shown in FIGS. 1 and 2, the conduit cutting and expanding tool 1 includes a conduit cutting jig 10, a conduit expanding jig 20 (so-called expander), and a rotation angle detection device 30. there is It should be noted that the pipe line cutting jig 10 corresponds to the "pipe line cutting jig" described in the claims.

(Pipe line cutting jig 10)
First, the pipeline cutting jig 10 constituting the pipeline cutting and expanding tool 1 will be described with reference to FIGS. 2 and 3. FIG.
As shown in FIGS. 2 and 3, the pipeline cutting jig 10 includes a substantially cylindrical main body 11, a plurality of cutter wheels 12A to 12D, a first guide wheel 13, and a plurality of (in this embodiment, "3 set") and a second guide wheel 14. The main body 11, the cutter wheels 12A to 12D, the first guide wheel 13, and the second guide wheel 14 are respectively referred to as the "main body", the "cutter member", and the " It corresponds to the "first guide wheel"("guidewheel") and the "second guide wheel"("guidewheel").

The main body 11 is formed of a steel material, and has an insertion end 11A connected to the rod R (“bolt connection” in this embodiment) and a pipe diameter expanding jig 20 (“bolt connection” in this embodiment). and an anti-insertion end 11B. The insertion end 11A and the anti-insertion end 11B correspond to the "insertion end" and the "anti-insertion end" described in the claims, respectively.

In addition, the main body 11 has
(a) housing holes 11a1 to 11d1 for housing the cutter wheels 12A to 12D, respectively;
(b) housing grooves 11e1 and 11f1 for housing rotating members 13A and 13B of the first guide wheel 13, which will be described later, respectively;
(c) housing grooves 11g1 and 11h1 for housing rotating members 14A and 14B of the second guide wheel 14, which will be described later, respectively;
is formed.

The storage holes 11a1 to 11d1 each have an elongated hole shape and are formed to pass through the main body 11 at intervals along the axial direction.
Shaft insertion holes 11a2 to 11d2 through which the shaft members 15A to 15D can be inserted are formed in these storage holes 11a1 to 11d1 in a direction crossing the insertion direction of the cutter wheels 12A to 12D.

The cutter wheels 12A to 12D are rotatably supported by the main body 11 by inserting the shaft members 15A to 15D into the shaft insertion holes 11a2 to 11d2 while being housed in the housing holes 11a1 to 11d1, respectively. It's becoming
In this state, the cutter wheels 12A to 12D protrude from the outer surface of the main body 11, and their cutting edges are linearly arranged along the axial direction of the main body 11. As shown in FIG. The projection direction of the cutter wheels 12A to 12D corresponds to the "first direction" described in the claims.

Each of the storage grooves 11e1 and 11f1 has a rectangular groove shape, and is located on the side opposite to the outer surface of the main body 11 from which the cutter wheels 12A to 12D protrude (hereinafter referred to as the "cutting side") (hereinafter referred to as the "guide side"). ) is formed on the outer surface of the
These storage grooves 11e1 and 11f1 are spaced apart from each other along the axial direction of the main body 11 on the insertion end 11A side of the storage hole 11a1, and directed radially outward from the axial center of the main body 11 when viewed in the axial direction. are formed so as to spread radially (see "AA cross section" and "BB cross section" in FIG. 3).

Further, shaft insertion holes 11e2 and 11f2 through which the shaft members 15E and 15F can be inserted are formed in the storage grooves 11e1 and 11f1 so as to penetrate in a direction crossing the insertion direction of the first guide wheel 13. .

Rotating members 13A and 13B of the first guide wheel 13, which will be described later, are rotated by the main body 11 by inserting the shaft members 15E and 15F into the shaft insertion holes 11e2 and 11f2 while being housed in the housing grooves 11e1 and 11f1, respectively. It is freely supported.
In this state, the rotary members 13A and 13B are arranged so as to protrude radially from the outer surface of the main body 11 when viewed in the axial direction.

Like the storage grooves 11e1 and 11f1, the storage grooves 11g1 and 11h1 each have a rectangular groove shape and are provided on the outer surface of the main body 11 on the “guide side”.
In this embodiment, rotating members 14A and 14B of the second guide wheel 14, which will be described later, are configured to be attached to the main body 11 in "three sets." For this reason, the housing grooves 11g1 and 11h1 are also formed in "three sets" in the main body 11 correspondingly.

The “three sets” of storage grooves 11g1 and 11h1 are provided between the cutter wheels 12A and 12B, between the cutter wheels 12B and 12C, and between the cutter wheels 12C and 12D, respectively. They are formed so as to face each other with a space along the direction. Note that the "three sets" of storage grooves 11g1 and 11h1 (the "three sets" of rotating members 14A and 14B (second guide wheels 14)) all have the same configuration. Unless otherwise specified, "one set" of storage grooves 11g1 and 11h1 ("one set" of rotating members 14A and 14B) will be described, and other storage grooves 11g1 and 11h1 (other rotating members 14A and 14B) will be described. Description is omitted.

A shaft insertion hole 11g2 through which the shaft member 15G can be inserted is formed in the storage grooves 11g1 and 11h1 so as to penetrate in a direction crossing the insertion direction of the second guide wheel .

Rotating members 14A and 14B of the second guide wheel 14, which will be described later, are rotatably supported by the main body 11 by inserting the shaft member 15G into the shaft insertion hole 11g2 while being housed in the housing grooves 11g1 and 11h1, respectively. It has become so.
In this state, the rotary members 14A and 14B are arranged so as to protrude in the same direction from the outer surface of the main body 11. As shown in FIG. The direction in which the first guide wheel 13 and the second guide wheel protrude corresponds to the "second direction" described in the claims.

Next, the cutter wheels 12A-12D will be explained.
The cutter wheels 12A to 12D are provided with cutting edges for cutting the pipe wall of the existing pipeline P1 at their outer peripheral tips, and are formed so that their diameters increase in that order.
These cutter wheels 12A to 12D are rotatably supported by the main body 11 and arranged so that the distance from the axis of the main body 11 to the cutting edge gradually increases.

The cutter wheels 12A to 12D move the pipe line cutting jig 10 in the pipe axis direction within the existing pipe line P1,
(a) A cutter wheel 12A having the smallest diameter is used to form cut marks along the pipe axis direction on the pipe wall of the existing pipe P1.
(b) deepening the cutting depth of the cut mark formed by the cutter wheel 12A with the cutter wheels 12B and 12C;
(c) The pipe wall of the existing pipeline P1 is completely cut along the pipe axis direction with the cutter wheel 12D having the largest diameter.
It is configured to cut the existing pipeline P1 in such a flow. In addition, although a rotary cutter member (cutter wheel) is used in this embodiment, it is also possible to use other cutter members (for example, a fixed blade) instead of this.

Next, the first guide wheel 13 will be explained.
The first guide wheel 13 has a pair of rotating members 13A and 13B, and cutting edges similar to those of the cutter wheels 12A to 12D are formed at their outer peripheral tips. The rotating members 13A and 13B correspond to "a pair of rotating members" described in the claims.
As described above, the rotating members 13A and 13B are rotatably supported by the main body 11 by inserting the shaft members 15E and 15F while being housed in the housing grooves 11e1 and 11f1, respectively. ing.

In this state, the rotary members 13A and 13B are arranged so as to protrude radially from the outer surface of the main body 11. As shown in FIG.
Specifically, the rotating members 13A and 13B are
(a) With the pipe line cutting jig 10 inserted into the existing pipe line P1, they are arranged such that their protruding directions overlap on the substantially normal direction of the inner surface of the existing pipe line P1,
(b) When viewed in the axial direction, the anti-protruding directions of the cutter wheels 12A to 12D and the protruding directions of the rotating members 14A and 14B, which will be described later, are arranged between these protruding directions.
It's like

Further, the rotating members 13A and 13B are set so that the amount of protrusion from the outer surface of the main body 11 is shorter than the pipe thickness (thickness) of the existing pipe line P1.
Therefore, in the present embodiment, even if the pipe line cutting jig 10 is moved in the pipe axial direction within the existing pipe line P1, the pipe wall of the existing pipe line P1 is not cut by the rotary members 13A and 13B. Instead, two grooves G1, G1 (see "AA cross section" and "BB cross section" in FIG. 3) are formed on the inner surface. In the present embodiment, the outer peripheral tips of the rotating members 13A and 13B have a sharp shape (acute angle shape). ) is also possible.

Next, the second guide wheel 14 will be explained.
Like the first guide wheel 13, the second guide wheel 14 has a pair of rotating members 14A and 14B, and cutting edges are formed at the outer peripheral ends thereof. The rotating members 14A and 14B correspond to "a pair of rotating members" described in the claims.
As described above, these rotating members 14A and 14B are rotatably supported by the main body 11 by inserting "one" shaft member 15G in a state of being housed in the housing grooves 11g1 and 11h1, respectively. It has become so.

In this embodiment, the rotating members 14A and 14B and the cutter wheels 12A to 12D are configured to protrude from the main body 11 in mutually opposite directions when assembled to the main body 11. As shown in FIG.

Further, similarly to the rotating members 13A and 13B, the rotating members 14A and 14B are set so that the amount of protrusion from the outer surface of the main body 11 is shorter than the pipe thickness (thickness) of the existing pipeline P1. there is
Therefore, in the present embodiment, even if the pipe line cutting jig 10 is moved within the existing pipe line P1, the pipe wall of the existing pipe line P1 is not cut by the rotating members 14A and 14B. It is constructed so that two grooves G2, G2 (see "DD cross section" in FIG. 3) are formed only in the grooves. In the present embodiment, the outer peripheral tips of the rotary members 14A and 14B are formed into a sharp shape (acute angle shape), but a shape that makes it difficult or impossible to form the groove G2 on the inner surface of the existing pipeline P1 (for example, , circular arc shape in cross section).

(Pipe diameter expansion jig 20)
Next, the conduit diameter expanding jig 20 will be described with reference to FIG.
As shown in FIG. 2, the pipe diameter expanding jig 20 is made of a steel member and is formed in the shape of a truncated cone (the shape of a truncated cone). The diameter-reducing jig 20 has an insertion end 20A connected (in this embodiment, “bolt connection”) to the anti-insertion end 11B of the conduit cutting jig 10, and a rotational angle It has an anti-insertion end 20B on the enlarged diameter side that is connected (“screw connection” in this embodiment) to the insertion end 32A of the detection device 30 .

Since the pipe diameter expanding jig 20 used in the pipe splitter construction method is now well known, a detailed description will be omitted. It is constructed such that the pipe wall is cut open as it is pulled into the existing pipe line P1 along with the jig 10 in the pipe axial direction.

(Rotation angle detection device 30)
Next, the rotation angle detection device 30 will be described.
The rotation angle detection device 30 is a device for detecting the relative angle of the pipeline cutting jig 10 with respect to the existing pipeline P1, and has a device main body 31 and a covering member 32 that covers the device main body 31. there is

For the device main body 31, for example, a known transmitter with a built-in angle sensor can be used. In this case, in order to detect the rotation angle information detected by the device main body 31 on the ground, for example, the device main body 31 is composed of a device capable of transmitting the rotation angle information using an electromagnetic field. A receiver that can be captured and analyzed (a so-called locator) can be placed on the ground.

The covering member 32 is a member that covers the apparatus main body 31 from the outer surface side in order to prevent breakage and damage of the device main body 31, and is connected to the anti-insertion end 20B of the pipe diameter expanding jig 20 (in this embodiment, a "screw It has an insertion end 32A to be connected") and an anti-insertion end 32B that can be connected to a connection member (for example, a hanging ring member) attached to the new pipeline P2. The coating member 32 is not particularly limited as long as it can enclose the device main body 31 in a non-rotatable manner, and can be formed of a steel pipe member, for example.

In the present embodiment, since the pipe line cutting and expanding tool 1 is provided with the rotation angle detection device 30, for example, when the pipe line cutting jig 10 behaves unnaturally in the existing pipe line P1, the pushing force is detected. It is possible to take measures such as stopping the driving of the pulling device D at an early stage.
As a result, in this embodiment, troubles such as breakage or damage of the pipe line cutting jig 10 can be prevented. In this embodiment, the pipe line cutting and expanding tool 1 is provided with the rotation angle detection device 30, but it is also possible to omit it.

(Structure of pipeline cutting method)
Next, a pipeline cutting method using the pipeline cutting jig 10 according to the present embodiment will be described with reference to FIGS. 1 to 6. FIG. In the following, for convenience of explanation,
・The rod R inserted from the starting shaft V1 is pushed into the arrival shaft V2 through the existing pipeline P1 by the pushing operation of the push-pull device D.
This is a premise.

As shown in FIG. 4, the pipeline cutting method according to this embodiment includes a pipeline cutting jig connecting step S100, a guide wheel contacting step S200, and a pipeline cutting step S300. The guide wheel contacting step S200 and the pipe line cutting step S300 correspond to the "guide wheel contacting step" and the "pipe line cutting step", respectively.

(Pipe line cutting jig connecting step S100)
As shown in FIGS. 1, 2 and 4, the pipeline cutting method according to the present embodiment starts with performing a pipeline cutting jig connecting step S100.
Specifically, in the pipeline cutting jig connecting step S100,
(a) connecting the insertion end 11A of the conduit cutting jig 10 to the rod R;
(b) connecting the conduit diameter expanding jig 20, the rotation angle detector 30 and the new conduit P2 in this order to the anti-insertion end 11B of the conduit cutting jig 10;
do the work. In this embodiment, the pipeline cutting jig 10, the pipeline diameter expanding jig 20, and the rotation angle detection device 30 are connected to each other, and are firmly coupled so as not to rotate individually. configured to be
In the present embodiment, after the pipeline cutting jig connection step S100 is performed, the guide wheel contact step S200, which is the next step, is performed.

(Guide wheel contact step S200)
As shown in FIGS. 1 to 4, in the guide wheel contact step S200, the first guide wheel 13 and the second guide wheel 14 of the pipeline cutting jig 10 are brought into contact with the inner surface of the existing pipeline P1.
Specifically, in the guide wheel contacting step S200, the pushing/pulling device D is driven to draw the pipe line cutting jig 10 (pipe line cutting and expanding tool 1) into the existing pipe line P1.

When the pipe line cutting jig 10 is drawn into the existing pipe line P1, in this embodiment, first, the rotating members 13A and 13B of the first guide wheel 13 and the plurality of cutter wheels 12A are installed in the existing pipe line P1. are inserted in that order.
At this time, as the cutter wheel 12A is inserted into the existing pipe line P1, the rotating members 13A and 13B are such that their outer peripheral tips are strongly pressed against the inner surface of the existing pipe line P1.

After that, when the pipe line cutting jig 10 is further drawn into the existing pipe line P1, in this embodiment, a cutter wheel 12B having a larger diameter than the cutter wheel 12A and a cutter wheel 12C having a larger diameter than this are used. , are inserted in that order.

As the cutter wheels 12B and 12C are inserted, the rotating members 13A and 13B rotate and move inside the existing pipeline P1 while increasing the pressing force against the inner surface of the existing pipeline P1. .
As a result, two grooves G1, G1 are formed on the inner surface of the existing pipeline P1 along the direction in which the pipeline cutting jig 10 moves.

As described above, in the present embodiment, since the rotating members 13A and 13B are arranged so that the protruding directions of the rotating members 13A and 13B overlap substantially in the normal direction of the inner surface of the existing pipeline P1, the pipeline cutting jig 10 can be used to cut the existing pipeline. The inner surface of the path P1 can be made to grip well.
As a result, in this embodiment, it is possible to effectively suppress rotational movement of the pipeline cutting jig 10 during cutting of the existing pipeline P1.

After that, when the pipeline cutting jig 10 is drawn into the existing pipeline P1, in this embodiment, the rotating members 14A and 14B of the "three sets" of the second guide wheels 14 are sequentially inserted into the existing pipeline P1. I'm going to go.
In a state in which the "three sets" of rotating members 14A and 14B are inserted into the existing pipeline P1, the inner surface of the existing pipeline P1 has:
(a) At the same time that the cutter wheels 12A-12D are pushed harder,
(b) the rotating members 14A and 14B protruding on the opposite side are also strongly pressed;
become.

As described above, in this embodiment, the rotating members 14A and 14B supported by the "single" shaft member 15G are provided on the counter-insertion end 11B side of the main body 11 where a relatively large reaction force acts. Therefore, the reaction force can be distributed and received by "two" members.
As a result, in this embodiment, even if a large reaction force acts on the anti-insertion end 11B side of the main body 11 during the cutting of the existing pipe line P1, the effect on the rotational behavior of the rotating members 14A and 14B is reduced. can be reduced, the pipe line cutting jig 10 can stably travel straight within the existing pipe line P1.

In the present embodiment, after the guide wheel contacting step S200 is performed (after the first guide wheel 13 and the second guide wheel 14 are brought into contact with the inner surface of the existing pipeline P1), the next step is pipeline cutting. Step S300 is to be performed.

(Pipe line cutting step S300)
In the pipe line cutting step S300, the existing pipe line P1 is cut along the pipe axis direction by the cutter wheels 12A to 12D.
Specifically, in the pipeline cutting step S300, the push-pull device D is driven to move the pipeline cutting jig 10 (pipeline cutting expander 1) located on the side of the arrival vertical shaft V2 to the starting vertical shaft V1. do the work.

In this way, when the pipe line cutting expander 1 is moved within the existing pipe line P1,
(a) Along the pipe axis direction, on the inner surface (pipe wall) of the existing pipeline P1,
・The two grooves G1, G1 are formed by the first guide wheel 13, and
・The two grooves G2, G2 are formed by the second guide wheel 14,
each formed and
(b) the opposite tube wall is cut by cutter wheels 12A-12D;
It's like

As described above, in this embodiment, the two types of guide wheels (the first guide wheel 13 and the second guide wheel 14) effectively rotate the pipeline cutting jig 10 within the existing pipeline P1. As a result, the cutter wheels 12A to 12D can cut the pipe wall of the existing pipe line P1 in a straight line.

In addition, in the present embodiment, since the conduit diameter expanding jig 20 and the new conduit P2 are connected to the conduit cutting jig 10, the existing conduit P1 is cut by the cutter wheels 12A to 12D. at the same time,
(a) The existing pipeline P1 is expanded (diameter-expanded) from the inner surface side by the pipeline diameter-expanding jig 20,
(b) a new pipeline P2 is laid along the existing pipeline P1;
It's like

As described above, in the present embodiment, since the grooves G1, G1 and the grooves G2, G2 are formed on the inner surface of the existing pipeline P1, the diameter of the existing pipeline P1 can be expanded by the pipeline diameter expanding jig 20. With these grooves as a base point, it is configured to be performed.
That is, in the present embodiment, since the diameter of the existing pipeline P1 can be expanded with a relatively small drawing force, the drawing ability of the pushing/pulling device D can be reduced. It is possible to plan

The pipeline cutting method ends when the pipeline cutting expander 1 is moved to the starting shaft V1 by the push-pull device D. As shown in FIG.

(Test for pipeline cutting jig)
Here, the test results when the work similar to the above-described "pipe line cutting step S300" is performed will be described with reference to FIGS. 1, 5 and 6. FIG.
In addition, in FIG.
・The “○” in the lower column of “First front” indicates that the first guide wheel 13 is provided closer to the insertion end 11A than the cutter wheel 12A.
・"○" in the lower column of "second front" indicates that the second guide wheel 14 is provided between the cutter wheel 12A and the cutter wheel 12B.
- "O" in the lower column of "Second middle" indicates that the second guide wheel 14 is provided between the cutter wheel 12B and the cutter wheel 12C.
- "O" in the column under "Second rear" indicates that the second guide wheel 14 is provided between the cutter wheel 12C and the cutter wheel 12D.
・The “○” in the lower column of “first rear” indicates that the first guide wheel 13′ (rotating members 13A′, 13B′) (having the same configuration as the first guide wheel 13) is positioned farther from the insertion end than the cutter wheel 12D. that it is provided in 11B,
each shown.
Further, in FIG. 6, "rotation suppression" indicates the degree of rotation suppression when the pipe cutting jig is moved in the pipe axial direction in the pipe, and "insertability" indicates the pipe cutting jig. 4 shows the state of insertion (whether or not it was possible to be inserted) when the was moved in the pipe axial direction in the pipe.

As shown in FIG. 5, in this test, a test pipeline TP (in this embodiment, the total length is "30 m") was used to cut the pipeline cutting jig 10 and "Comparative Example 1" to "Comparative Example 6". ” (in this embodiment, a performance test on “rotation prevention” property and “insertability”) was conducted.
As shown in FIG. 5, the test pipe TP used in this test is a plurality of steel pipe materials (for example, nominal diameter 50A) cut to a predetermined length,
- Plug-in type pipe joint C1 (cap nut type pipe joint) that can connect pipe materials by tightening a so-called cap nut,
A plug-in type pipe joint C2 (housing type pipe joint) capable of connecting pipe materials by joining a pair of housing members with bolts and nuts, and
- A soft tube C3 made of a soft member such as a polyethylene tube,
It is created by connecting with either

Further, in this test, the pipe diameter expanding jig 20 and the rotation angle detection device 30 were connected by the pushing/pulling device D under the same working conditions as the above-described “pipe line cutting step S300” (see FIG. 4). It was carried out under working conditions such that the pipe line cutting jig was pulled into the test pipe line TP.
The test results of the pipeline cutting jig 10 and the pipeline cutting jigs of "Comparative Example 1" to "Comparative Example 6" will be described below.

(Test result of pipeline cutting jig 10)
First, test results using the pipeline cutting jig 10 according to the present embodiment will be described.
As shown in FIGS. 5 and 6, as a result of moving the pipeline cutting jig 10 according to the present embodiment within the test pipeline TP,
(a) It does not stop in the middle of drawing (without getting caught on the pipe joints C1, C2, the soft pipe C3, etc.), and
(b) without rotational movement;
Since the test pipeline TP could be cut open along the tube axis direction, the test result of "good" was obtained in both the "rotation suppression" performance and the "penetration" performance in this test.

(Test result of "Comparative Example 1")
Next, test results using the pipeline cutting jig of "Comparative Example 1" will be described.
Compared to the pipeline cutting jig 10, the pipeline cutting jig of "Comparative Example 1"
- A first guide wheel 13' (rotating members 13A' and 13B') is added.
The pipeline cutting jig of "Comparative Example 1" was moved within the test pipeline TP.
resulting in,
(a) No evidence of rotational movement was observed,
(b) During the retraction, the pipe joints C1, C2, etc. were caught and stopped. was a test result of "impossible".

(Test result of "Comparative Example 2")
Next, test results using the conduit cutting jig of "Comparative Example 2" will be described.
Compared to the pipeline cutting jig 10, the pipeline cutting jig of "Comparative Example 2"
- The first guide wheel 13 is removed.
As a result of moving such a pipeline cutting jig of "Comparative Example 2" within the test pipeline TP,
(a) In addition to stopping in the middle of retraction,
(b) Evidence of rotational movement was observed before stopping;
Therefore, in this test, the test result was "impossible" in both the "rotation prevention" performance and the "insertion" performance.

(Test result of "Comparative Example 3")
Next, test results using the pipeline cutting jig of "Comparative Example 3" will be described.
Compared to the pipeline cutting jig 10, the pipeline cutting jig of "Comparative Example 3"
(a) adding a first guide wheel 13' (rotating members 13A' and 13B');
(b) all "three sets" of second guide wheels 14 have been removed;
It is.
When the pipeline cutting jig of "Comparative Example 3" was moved in the test pipeline TP, the same test result as that of the pipeline cutting jig of "Comparative Example 2"("rotation It was "impossible" in both the "prevention" performance and the "penetration" performance).

(Test result of "Comparative Example 4")
Next, the test results using the pipeline cutting jig of "Comparative Example 4" will be described.
Compared to the pipeline cutting jig 10, the pipeline cutting jig of "Comparative Example 4"
- Removing the first guide wheel 13 and providing the first guide wheel 13' (rotating members 13A' and 13B'),
- The "middle ("second middle")" and "opposite insertion end side (second rear)" of the "three sets" of the second guide wheels 14 are removed,
When such a pipe cutting jig of "Comparative Example 4" was moved in the test pipe line TP, the test results of this test showed that the pipes of "Comparative Example 2" and "Comparative Example 3" The test results were similar to those of the road cutting jig (both "rotation prevention" performance and "insertion" performance were "improper").

Considering the above test results (test results of pipe cutting jig 10 and “Comparative Example 1” to “Comparative Example 4”),
(a) In order to make the "insertion" performance "good",
- At least one of the first guide wheel 13 and the "three sets" of second guide wheels 14 must be provided (hereinafter referred to as the "first condition"), and
- The first guide wheel 13' must not be provided (hereinafter referred to as the "second condition"),
While it is necessary to satisfy at least two conditions such as
(b) In order to improve the "rotation suppression" performance,
・ At least, it is necessary to satisfy the above "first condition",
I understand.

That is, it can be expected that the above-mentioned "first condition" and "second condition" must be satisfied in order to make both the "insertion" performance and the "rotation" performance "good".
The results of tests conducted to verify such predictions will be described below.

(Test results of "Comparative Example 5" and "Comparative Example 6")
In the test for verifying the above prediction, for the pipeline cutting jig 10, among the "three sets" of the second guide wheels 14,
(a) Pipe line cutting jig (hereinafter referred to as pipe cutting jig of Comparative Example 5) from which “insertion end side (“second front”)” and “middle (second middle)” are removed; ,
(b) "pipe line cutting jig from which the non-insertion end side (second rear side) has been removed (hereinafter referred to as the pipe line cutting jig of "Comparative Example 6");
was used to work.
As a result, both the pipeline cutting jigs of "Comparative Example 5" and "Comparative Example 6" had the same test results as the pipeline cutting jig 10 (in both "rotation suppression" performance and "insertion" performance was also “good”).

From the above test results (test results of "Comparative Example 5" and "Comparative Example 6"), in order to make either "insertion" performance or "rotation" performance "good", the above "first condition ” and “Second condition” were necessary.

As described above, in the present embodiment, the pair of rotating members 13A and 13B (first guide wheels 13) protruding radially from the outer surface of the main body 11 are arranged closer to the insertion end 11A than the cutter wheels 12A to 12D. are placed.
Therefore, in the present embodiment, the insertion end 11A side of the main body 11 can be satisfactorily gripped on the inner surface of the existing pipeline P1 via the rotating members 13A and 13B. It is possible to effectively suppress the rotational movement of the path cutting jig 10 .

In addition, in this embodiment, the rotating members 14A and 14B (second guide wheels 14) supported by the shaft member 15G are arranged between the cutter wheels 12C and 12D.
That is, in the present embodiment, since the rotating members 14A and 14B supported by "one" shaft member 15G are provided on the side opposite to the insertion end 11B where a relatively large reaction force tends to act, It is possible to disperse and receive the force with "two" rotating members.
As a result, in the present embodiment, since the influence on the rotational behavior of the rotating members 14A and 14B can be reduced, the pipe line cutting jig 10 can stably travel straight within the existing pipe line P1. be.

In summary, in this embodiment, two types of guide wheels, the first guide wheel 13 and the second guide wheel 14, stably move the pipeline cutting jig 10 without rotating it within the existing pipeline P1. It is possible to run straight ahead.

In this embodiment, the rotating members 13A and 13B of the first guide wheel 13 are arranged so as to protrude radially from the outer surface of the main body 11, that is, arranged in an "inverted V shape" when viewed in the axial direction. , and may be arranged in a “V” shape.

In addition, in the present embodiment, the rotating members 13A and 13B are arranged axially apart from each other.

Furthermore, in this embodiment, the rotating members 14A and 14B are supported by "one" shaft member 15G, but it is also possible to support them by other shaft members such as the rotating members 13A and 13B.

Further, in the present embodiment, the rotating members 14A and 14B are arranged so as to protrude from the outer surface of the main body 11 in the same direction. On the condition that the angle between the axis of the member 13A and the axis of the rotating member 13B is smaller than the angle between the rotating members 13A and 13B, the rotating members 13A and 13B may be arranged in an "inverted V shape" when viewed in the axial direction. , or may be arranged in the opposite "V shape".

Furthermore, in the present embodiment, the pipeline through which gas flows (existing pipeline P1) is cut open using the pipeline cutting and expanding tool 1. , drain pipes and oil pipes) may be cut open, and conduits (eg electrical conduits) through which no fluid may flow may be cut open.

In addition, in the present embodiment, an example of using the pipeline cutting jig 10 in a pipe splitter construction method (a construction method in which the existing pipeline P1 is cut open and replaced with a new pipeline P2) is shown. , it can also be used only to cut a pipeline.

Although the embodiments to which the invention made by the present inventor is applied have been described above, the present invention is not limited by the statements and drawings forming a part of the disclosure of the present invention according to the embodiments. That is, it should be added that other embodiments, examples, operation techniques, etc. made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

1 pipe cutting and expanding tool 10 pipe cutting jig 11 main body 11A insertion end 11B anti-insertion end 11a1-11d1 storage holes 11e1-11h1 storage grooves 11a2-11g2 shaft insertion holes 12A-12D cutter wheels 13, 13' first guide Wheels 13A, 13B Rotating member 14 Second guide wheels 14A, 14B Rotating members 15A to 15G Shaft member 20 Pipe diameter expanding jig 20A Insertion end 20B Anti-insertion end 30 Rotation angle detection device 31 Device main body 32 Coating member 32A Insertion end 32B Anti-insertion end P1 Existing pipeline P2 New pipeline V1 Departure shaft V2 Arrival shaft D Push/pull device R Rods G1, G2 Groove TP Test pipelines C1, C2 Pipe joint C3 Soft pipe

Claims (4)

a body insertable into a conduit;
a plurality of cutter members provided on the main body, protruding from the outer surface of the main body in a first direction and arranged side by side in the axial direction of the main body;
a plurality of guide wheels rotatably provided on the main body and protruding from an outer surface of the main body in a second direction opposite to the first direction;
A conduit cutting jig comprising
The plurality of guide wheels are
a first guide wheel provided closer to the insertion end of the body than all of the cutter members;
a second guide wheel different from the first guide wheel provided between the cutter member positioned closest to the insertion end of the main body and the cutter member positioned farthest away from the insertion end of the main body,
A guide hole is not provided on the anti-insertion end side of the cutter member positioned closest to the anti-insertion end side of the main body,
The first guide wheel and the second guide wheel are
each having a pair of rotating members in contact with the inner surface of the conduit,
The inclination angle of the axis of one of the rotating members with respect to the axis of the other rotating member is
The first guide wheel is larger than the second guide wheel,
The second guide wheel is
The axis of one of the rotating members and the axis of the other rotating member are arranged on the same axis,
A pipeline cutting jig characterized by: 2. The pipe line cutting jig according to claim 1, wherein the first guide wheel is provided so that the pair of rotating members radially protrude from the outer surface of the main body. 3. The pipe cutting jig according to claim 1, wherein the rotating member has a radially outer tip formed at an acute angle. a body insertable into a conduit;
a plurality of cutter members provided on the main body, protruding from the outer surface of the main body in a first direction and arranged side by side in the axial direction of the main body;
a plurality of guide wheels rotatably provided on the main body and protruding from an outer surface of the main body in a second direction opposite to the first direction;
A pipeline cutting method for cutting the pipeline using a pipeline cutting jig comprising
The plurality of guide wheels are
a first guide wheel provided closer to the insertion end of the body than all of the cutter members;
a second guide wheel different from the first guide wheel provided between the cutter member positioned closest to the insertion end of the body and the cutter member positioned farthest away from the insertion end of the main body,
A guide hole is not provided on the side opposite to the insertion end of the cutter member located on the side closest to the opposite insertion end of the main body,
The first guide wheel and the second guide wheel are
each having a pair of rotating members in contact with the inner surface of the pipeline,
The inclination angle of the axis of one of the rotating members with respect to the axis of the other rotating member is
The first guide wheel is larger than the second guide wheel,
The second guide wheel is
The axis of one of the rotating members and the axis of the other rotating member are arranged on the same axis,
The pipeline cutting method includes:
a guide wheel contacting step of inserting the insertion end side of the pipeline cutting jig into the pipeline and bringing the first guide wheel and the second guide wheel into contact with the inner surface of the pipeline;
a pipeline cutting step of further moving the pipeline cutting jig in the insertion direction after performing the guide wheel contacting step and cutting the pipeline wall of the pipeline with the plurality of cutter members in the pipe axial direction; include,
A pipeline cutting method characterized by:

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