JP2016176560A - Separation method of pipeline and electric fusion joint, method for separating heating wire from electric fusion joint, separation jig of pipeline and electric fusion joint using the same, and heating wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separation method of a pipeline and an electric fusion joint, which has excellent recycling rate with efficiency, a method for separating a heating wire from the joint, a separation jig of the pipeline and the electric fusion joint using the methods, and the heating wire.SOLUTION: A separation method of a pipeline and an electric fusion joint includes the steps of: heating an electric fusion joint 2 having a pipeline 1 fused into a pipeline insertion part 4a; inserting a jig 10 including a locking claw 30 into the pipeline 1, and locking the locking claw 30 to an inner peripheral wall 8a of the pipeline 1 or an end surface 6t; and drawing the jig 10 toward the outside of the pipeline insertion part 4a, and separating the pipeline 1 locked to the locking claw 30 from the pipeline insertion part 4a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for separating a pipe and an electric fusion joint, a method for separating a heating wire from the electric fusion joint, a separation jig for the pipe and the electric fusion joint used for these, and a heating wire.

  Conventionally, a synthetic resin pipe such as a polyethylene pipe is frequently used for water pipes, gas pipes and the like because they are excellent in durability, corrosion resistance and flexibility, and are lightweight and excellent in workability (workability). In addition, as a joint for connecting this kind of pipe material, it is possible to easily perform a joining operation without using an expensive tool, and there are many advantages such as high reliability and no variation in connection quality. A fitting joint (hereinafter referred to as an EF joint) is frequently used.

As an EF joint, for example, one in which a heating wire is incorporated in a spiral shape on the inner peripheral surface side of a polyethylene joint pipe is known. EF joints are widely used for gas pipes and the like because they are not corroded and are light and resistant to earthquakes.
When recycling the used waste material of such an EF joint, since polyethylene resin is pelletized and reused, it is necessary to separate into polyethylene resin and a heating wire.

  Conventionally, for example, a recycling method described in Patent Document 1 has been proposed as a technique for separating and recycling a waste EF joint into a polyethylene resin and a heating wire. In this recycling method, the EF joint is finely pulverized, and is separated into a crushed piece containing a heating wire and a crushed piece not containing a heating wire by water specific gravity difference sorting. And the crushing piece containing a heating wire is discarded as industrial waste, and the crushing piece which does not contain a heating wire is pelletized after drying, and is reused.

JP-A-9-155866

However, in the above-described method of crushing and separating the joint, the crushed pieces made only of the resin are collected and recycled, and the crushed pieces including the heating wire are discarded. Resin is contained also in the fragmented piece containing a heating wire, and this resin has been discarded now. Also, the heating wire contained in the resin has been discarded. Therefore, it is desired to further increase the recycling rate of the material forming the joint pipe.
In addition, an efficient separation method between the pipe fused to the pipe insertion portion and the EF joint has not been known.
Therefore, the present invention provides an efficient and recyclable pipe and electrofusion joint separation method, a method of separating a heating wire from the joint, and a piping and electrofusion joint separation jig and heating wire used in these methods. .

The method for separating a pipe and an electric fusion joint according to the present invention includes a step of heating an electric fusion joint having a pipe fused to a pipe insertion portion, and a jig having a locking claw inserted in the pipe. A step of locking the locking claw to an inner peripheral wall or an end surface of the pipe, and pulling the jig toward the outside of the pipe insertion portion to connect the pipe locked by the locking claw to the pipe insertion portion. Separating from.
Since this method melts and softens the interface between the electric fusion joint and the pipe, engages the jig with the pipe and pulls it out, the electric fusion joint and the pipe can be easily separated.

The tip of the locking claw of the present invention may be formed with a smooth surface facing the inner peripheral surface of the pipe.
This method can prevent the inner wall surface of the pipe from being shaved by the locking claw.

In the present invention, the piping may be expanded by the heating, and the locking claw may be locked to the inner peripheral wall or the end surface of the piping.
In this method, the locking claw can be easily locked to the inner peripheral wall or the end surface of the pipe.

The method for separating a heating wire of an electric fusion joint according to the present invention includes a step of pulling a terminal of the electric fusion joint after the step of separating the pipe and the electric fusion joint by any one of the above methods, and the pipe insertion portion. The process which takes out the heating wire embed | buried in is included.
According to this method, any of the above actions can be exerted and the pipe can be peeled off without substantially leaving the pipe on the inner peripheral surface of the pipe insertion portion. Therefore, it becomes easy to pull out the heating wire embedded in the inner peripheral wall of the pipe insertion portion.

An electric fusion joint and pipe separation jig according to the present invention includes an engagement member that engages an inner peripheral wall or an end surface of a pipe fused to a pipe insertion portion of an electric fusion joint, and the engagement member that is connected to the pipe. A pulling member that moves toward the opening end side of the insertion portion, and the locking member is formed so as to be able to expand in diameter corresponding to the inner diameter of the pipe.
According to the present invention, the locking member can be securely locked to the pipe, and the pipe can be peeled off from the joint via the locking member by the drawing member.

The locking member according to the present invention includes a plurality of divided bodies formed by cutting a cylindrical member having a tapered inner peripheral surface and an outer peripheral surface in an axial direction, and the plurality of divided bodies can be expanded. A locking claw that protrudes radially outward from the outer peripheral surface of the divided body, and the pulling member gradually increases in diameter from the proximal end to the distal end. A taper portion that can be closely fitted to the inner peripheral surface is formed, and the pulling member is moved in the pulling direction with respect to the locking member in a state where the taper portion is closely fitted to the inner peripheral surface. Thus, the diameter of the locking member may be increased.
In this invention, by pulling the pulling member in the direction of pulling out from the pipe, it is possible to apply a force for radially expanding the locking member in the radial direction, so that the locking of the locking member to the pipe is ensured without loosening. Can be held. Therefore, according to the present invention, the pulling member can be moved in the pulling direction while the locking member is securely fixed to the pipe.

The tip of the locking claw of the present invention may be formed with a smooth surface facing the inner peripheral surface of the pipe.
Here, the smooth surface refers to a surface that does not have a sharp angle that easily damages the inner peripheral surface of the pipe, and is, for example, a curved surface in a side view or a flat peripheral surface in a side view.
According to the present invention, it is possible to prevent the inner peripheral wall of the pipe or the inner peripheral wall of the joint from being scraped by the tip of the locking claw.

  The heating wire of the present invention is separated by the method described above.

  The present invention easily separates the pipe fused to the electric fusion joint, and also easily takes out the heating wire from the electric fusion joint, so that the resin material and the heating wire used in the pipe, the electric fusion joint can be obtained. Recycling is facilitated and the recycling rate can be improved.

It is a partial cross section figure which shows the separation method of piping and the electric fusion joint which concern on one Embodiment of this invention, and the separation jig used for it. It is an upper perspective view which shows the separation jig which concerns on one Embodiment of this invention. It is an upper perspective view which shows the division body of the separation jig which concerns on one Embodiment of this invention. It is a side view of the separation jig concerning one embodiment of the present invention. It is an upper perspective view which shows the state which moved the latching member relatively with respect to the extraction member of the separation jig which concerns on one Embodiment of this invention. 1 is a partial cross-sectional view showing a method for separating a pipe and an electric fusion joint according to an embodiment of the present invention and a separation jig used therefor by dividing the pipe, the electric fusion joint and the separation jig into half. It is a partial cross section figure which shows other embodiment of the isolation | separation method of piping and the electrical fusion joint which concerns on one Embodiment of this invention, and the separation jig used for it.

  Hereinafter, with reference to the accompanying drawings, a method for separating a pipe and an electric fusion joint according to the present invention, a method for separating a heating wire from the electric fusion joint, and a jig for separating the pipe and the electric fusion joint used in these and an electric fusion joint. The form about a heat ray is demonstrated.

FIG. 1 is an axis L1 direction showing a configuration of an electric fusion joint 2 (hereinafter referred to as “joint 2”) to which a separation method of a pipe 1 and an electric fusion joint 2 according to an embodiment of the present invention is applied. FIG. 2 is a cross-sectional view of a part of (a joint 2 and a pipe 1).
As shown in FIG. 1, the joint 2 is used to connect two pipes 1 and 1.

The pipes 1 and 1 are made of a resin such as polyethylene and have a circular cross section.
The joint 2 is made of, for example, a thermoplastic resin such as polyethylene, and includes a tubular body 4, a heating wire 3, and terminals 5 and 5 as a whole.

The tube body 4 has pipe insertion portions 4a and 4a.
The pipe insertion portions 4 a are formed at both ends of the tube body 4 in the direction of the axis L <b> 1 and have an inner diameter corresponding to the outer diameter of the pipe 1.
The heating wire 3 is made of a metal wire such as a nichrome wire or an iron chrome wire, and is a wall in the vicinity of the inner peripheral surface 6 wound in a spiral shape along the inner peripheral surface 6 of the pipe insertion portion 4a. It is embedded (incorporated) in the portion 6p (hereinafter referred to as “inner peripheral wall 6p”). The end of the heating wire 3 is led out from the outer peripheral surface 4 m of the tube body 4 and connected to the terminals 5 and 5.

The terminal 5 is connected to a power supply controller (not shown). When a current is supplied from the power supply controller via the terminal 5, the heating wire 3 generates heat.
In the present embodiment, the joint 2 is in the state where the end 1a of the pipe 1 is inserted into the pipe insertion portion 4a, and the vicinity of the inner peripheral wall 6p of the pipe insertion portion 4a and the outer peripheral surface 7 of the pipe 1 due to heat generated by the heating wire 3. The pipe insertion part 4a and the pipe 1 are melted and fused in the vicinity of the interface K in contact with the wall part 7p (hereinafter referred to as "outer peripheral wall 7p").

Next, an embodiment of a separation jig 10 that separates the pipe 1 and the joint 2 will be described.
The separation jig 10 (hereinafter referred to as “separation jig 10”) for separating the pipe 1 and the joint 2 of the present invention includes a locking member 11 that is locked to the inner peripheral wall 8p or the end surface 6t of the pipe 1, and the locking member 11 is inserted into the pipe. And a drawing member 12 that is moved to the opening end 4s side of the portion 4a. Further, in the present embodiment, the separation jig 10 includes a base 13, a joint installation portion 14 installed on the base 13, and a cylinder (not shown) that moves the separation jig 10 in the direction of the axis L <b> 1 of the pipe 1. The separation device X of the pipe 1 including the driving unit 15 is incorporated.

  As shown in FIG. 2, the locking member 11 includes a virtual cylindrical member Y having a tapered inner peripheral surface 16 and an outer peripheral surface 17 formed with a constant diameter at equal intervals around the axis L2 and the axis L2. A plurality of divided bodies 18, 18... (Four in this embodiment) formed by cutting in the direction and a plurality of divided bodies 18, 18. Connecting members 19, 19,... Are provided.

  As shown in FIG. 3, the divided body 18 specifically includes a substantially arched top surface 20 and a substantially arched bottom surface 21, and an inner peripheral edge 20 a of the top surface 20 and an inner peripheral edge 21 a of the bottom surface 21. The formed inner peripheral surface 16, the outer peripheral surface 17 formed by a locus obtained by moving the outer peripheral edge 20b of the top surface 20 in parallel with the direction of the axis L2, and the bottom surface 21 corresponding to both side edges 20c and 20d of the top surface 20. It is a substantially solid member formed by being surrounded by flat first side surface 22 and second side surface 23 formed by connecting both side edges 21c and 21d.

On the outer peripheral surface 17 of the divided body 18, a locking claw 30 that protrudes radially outward along the bottom surface 21 is formed. As shown in FIG. 4, the tip of the locking claw 30 is formed by a smooth surface 30 a that faces the inner peripheral surface 8 of the pipe 1 shown in FIG. 1, in this embodiment, a surface 30 a that is substantially parallel to the outer peripheral surface 7. ing.
The locking claw 30 has a gradually increasing thickness dimension from the tip surface 30a toward the base end 30b.
As shown in FIG. 5, when the divided bodies 18, 18... Are brought closest to each other and the first side face 22 and the second side face 23 are brought into contact with each other, the first side face 22 and the second side face 23 are The included virtual plane P is formed so as to pass through the axis L2.

As shown in FIG. 2, a first insertion hole 35 and a second insertion hole 36 are formed in an intermediate portion of the divided body 18 in the direction of the axis L <b> 2.
The first insertion hole 35 penetrates the outer surface 17 toward the second side surface 23 and is formed as a fool hole. The second insertion hole 36 is formed so as to be orthogonal to the first side surface 22 from the first side surface 22 and opens to the outer peripheral surface 17. A female screw portion 36 a is formed on the inner peripheral surface of the second insertion hole 36. The first insertion hole 35 and the second insertion hole 36 are formed so that the connecting member 19 passes through the axis L3 in common.

  The divided bodies 18, 18,... Are all formed in the same shape. .. Are arranged such that the outer peripheral surface 17 is positioned on substantially the same circumference with the top surface 20 facing in the same direction, and the first insertion hole 35 and the second insertion hole 36. The connecting member 19 is inserted between them.

  The connecting member 19 may be any member as long as one end is fixed in the second insertion hole 36 and the other end is fixed in the first insertion hole 35 so as to be relatively movable within a certain range. However, in this embodiment, a screw having a male screw portion 19c is used.

  Specifically, the connecting member 19 is inserted into the first insertion hole 35 so as to be relatively movable, and the front end of the connecting member 19 on the body portion 19 a side is protruded from the second side surface 23. The head portion 19 b of the connecting member 19 is formed larger than the first insertion hole 35 and is locked at the opening end of the first insertion hole 35. The connecting member 19 is fixed by screwing the front end of the body portion 19a into the second insertion hole 36 of the adjacent divided body 18.

Thus, each divided body 18 has the connecting member 19 fixed at the end portion on the first side surface 22 side, and the connecting member 19 is within the length range of the connecting member 19 at the end portion on the second side surface 23 side. Are fixed so as to be movable relative to each other, and are connected so as to be able to approach and separate from each other, and the entire locking member 11 is connected so as to be able to expand and contract in diameter.
Further, as shown in FIG. 3, the inner peripheral surface 16 of each divided body 18 is formed so as to coincide with the same tapered shape as the entire locking member 11.

As shown in FIG. 2, the pulling member 12 is provided with a grip portion 12 a on one end side, and a tapered portion 12 b whose outer shape gradually increases from the base end to the tip end on the other end side. .
The taper angle of the taper portion 12 b is formed so as to coincide with the taper-shaped angle formed by the inner peripheral surface 16 of the locking member 11.

  The locking member 11 is pressed in a direction away from the divided bodies 18, 18, etc. by fitting the inner peripheral surface 16 thereof to the tapered portion 12 b of the pulling member 12 and moving the pulling member 12. In other words, the entire locking member 11 is pressed in the radial direction and can be locked to the pipe 1.

Next, a method for separating the pipe 1 from the joint 2 by the separation jig 10 and a method for separating the heating wire 3 from the joint 2 will be described.
First, as shown in FIG. 1, the pipe 1 fused to the pipe insertion part 4a of the joint 2 is cut in the vicinity of the pipe insertion part 4a, and the length of the fused pipe 1 is made as short as possible.

The locking member 11 expanded so that the outer diameter to the locking claw 30 is slightly smaller than the inner diameter of the pipe 1 is fitted into the tapered portion 12b of the drawing member 12.
As shown in FIG. 1, the pulling member 12 set as the locking member 11 is inserted into the pipe 1 until the locking claw 30 is positioned at the intermediate portion in the axis L1 direction of the pipe insertion portion 4a of the joint 2.

The heating wire 3 is energized through the terminal 5 of the joint 2 and preheated (heated). Preheating may be performed by applying thermal energy to the entire tube body 4 by an appropriate means such as a heater, hot air, a heating furnace, and vibration heat generation by high frequency, or may be performed by energizing the heating wire 3. When the terminal 5 of the joint 2 is energized and preheated, a controller used when constructing the pipe 1 and the joint 2 may be used, and the controller can be used to preheat to a desired temperature. In addition, when vibration heat is generated by high frequency, the heating wire can be preheated even when the heating wire 3 cannot be energized due to disconnection or the like. The preheating temperature is preferably a temperature at which the resin forming the tubular body 4 is softened, for example, about 190 ° C. The inner peripheral wall 6p of the pipe insertion portion 4a and the outer peripheral wall 7p of the pipe 1 are heated and melted.
As shown in FIG. 6, the pipe 1 is expanded by the above heating, and the engaging claw 30 is digged into the inner peripheral wall 6 p of the pipe 1 by about 0.5 mm-2 mm, and the extraction member 12 is placed on the opening end 4 s side of the pipe insertion portion 4 a. Pull in the direction of arrows F1 and F2.

  Then, since the taper portion 12b of the pulling member 12 presses the inner peripheral surface 16 of the locking member 11, the locking member 11 tries to move in the pulling direction (arrow F1, F2 direction) and expands in the radial direction. Try to move (that is, try to move in the direction of arrow F3). As a result, the state in which the locking claw 30 is engaged with the inner peripheral wall 6p without being loosened is maintained. Since the interface K between the inner peripheral surface 6 of the pipe insertion portion 4a and the outer peripheral surface 7 of the pipe 1 is easily melted and peeled, the drawing member 12 is connected to the opening end 4s side of the pipe insertion portion 4a (that is, outward). ), The locking member 11 separates the pipe 1 and the pipe insertion portion 4a and pulls the pipe 1 out of the pipe insertion portion 4a.

After extracting the pipe 1 from the pipe insertion portion 4a, the terminal 5 is pulled out of the boss 9 while the inner peripheral wall 6p of the pipe insertion portion 4a is melted, and the heating wire 3 is extracted from the inner peripheral wall 6p.
As described above, the pipe 1 can be separated from the joint 2, and the heating wire 3 can be further separated from the joint 2.

  As described above, the method for separating the pipe 1 and the joint 2 according to the present invention heats the joint 2 to soften the inner peripheral wall 6p of the pipe insertion portion 4a and the outer peripheral wall 7p of the pipe 1 and easily separate them. After that, the pipe 1 is pulled out to the outside of the pipe insertion portion 4a by using a jig that can be locked to the inner peripheral wall 8p of the pipe 1. Therefore, the joint 2 and the pipe 1 can be easily taken out from the pipe insertion portion 4a in a state where the original shape of the pipe 1 is substantially maintained without going through an inefficient process of finely cutting the joint 2 and the pipe 1.

Moreover, after cutting out the heating wire 3 by cutting the joint 2 and the piping 1 and making it difficult to take out, and extracting the piping 1, the terminals 5 at both ends are connected from the molten joint 2. The long heating wire 3 without a cutting part in between can be easily extracted.
Therefore, according to the present invention, the resin material of the joint 2 in which the pipe 1 is fused to the pipe insertion portion 4a and the long heating wire 3 are easily separated, and the resin material and the heating wire 3 are efficiently recycled. There is an effect that can be.

Moreover, since the separating jig 10 can expand the locking member 11 by pulling the pulling member 12 toward the outside of the pipe insertion portion 4a, the locking member 11 is securely bited into the inner peripheral wall 6p of the pipe 1. Thus, there is an effect that it can be pulled out and moved toward the outside of the pipe insertion portion 4a.
Further, since the locking member 11 is formed to be expandable by the divided body 18 and the connecting member, the separation jig 10 is applied to a plurality of pipes 1 having different inner diameters within the range of the locking member 11 being expanded. There is an effect that can be.

Moreover, since the latching claw 30 of the separation jig 10 is formed on a smooth surface facing the inner peripheral surface 8 of the pipe 1, it is possible to prevent the inner peripheral surface 8 of the pipe 1 from being damaged. Play.
Moreover, since the latching claw 30 of the separation jig 10 is formed so as to gradually increase in thickness, it prevents excessive penetration of the latching claw 30 into the inner peripheral wall 8p, so that the heating wire 3 of the joint 2 is connected. There exists an effect that it can prevent damaging.

  In the above embodiment, the locking member 11 is configured to include the divided body 18 obtained by dividing the virtual cylindrical member Y into approximately four equal parts. However, the divided body has a substantially uniform pulling force with respect to the pipe 1. As long as it can be multiplied, it may be divided into two or more.

  Moreover, as shown in FIG. 6, both the pipe insertion parts 4a and 4a of the joint 2 are used by using two separation jigs 10 by locking the locking claws 30 of the locking member 11 to the inner peripheral wall 8p of the pipe 1. A method of simultaneously separating the pipes 2 and 2 fused to each other was adopted. However, in the present invention, as shown in FIG. 7, the locking claw 30 may be locked to the end surface 6 t of the pipe 1, and the pipe 1 may be separated from the joint 2 one by one.

  Moreover, although the separation jig 10 can be used suitably for the separation method of the pipe 1 and the joint 2 of the present invention, the method of the present invention is not limited to the one using the separation jig 10. The method of the present invention can be applied to any jig as long as it can be pulled to the opening end 4s side of the pipe insertion portion 4a while being locked to the inner peripheral wall 8p or the end face 6t of the pipe 1. .

  Furthermore, the separation jig of the present invention is not limited to the embodiment shown in the above embodiment, but is related to the inner peripheral wall 8p or the end face 6t of the pipe 1 fused to the pipe insertion portion 4a of the joint 2. A locking member to be stopped and a pulling member to move the locking member to the opening end 4s side of the pipe insertion portion 4a are provided, and the locking member is formed so as to be able to expand in diameter corresponding to the inner diameter of the pipe 1. Any thing can be used.

Furthermore, in the above embodiment, the method for separating the pipe 1 and the heating wire 3 from the socket-like joint 2 for fusion-connecting two pipes 1 as a joint has been shown. The pipe 1 and the heating wire 3 fused by the same method can be separated even for a cheese-like joint having a branched portion.

Next, a method for separating a pipe and an electric fusion joint according to the present invention and a recycling flow by a method for separating a heating wire from the electric fusion joint will be described with reference to FIG.

<Recovery process>
The used pipes generated at the construction site and the electric fusion joint 2 to which the pipe 1 which is a piece of the used pipe is fused are collected from a contractor. Collection from contractors is performed by gas and water utilities.

<Undertaking process>
Undertakes the used pipe and the electric fusion joint 2 to which the pipe 1 is fused from a gas company, a water company, or the like. Polyethylene is divided into gas (medium density polyethylene: MDPE) and water (high density polyethylene: HDPE, high performance polyethylene: HPPE), and it is colored yellow for gas and blue for water. 1 and the electric fusion joint 2 need to be separated for gas and water use, but since they are collected by the gas company and water company, they are separated into only gas pipes or only water pipes. Can be undertaken.

<Separation process>
The used pipe and the electric fusion joint 2 to which the pipe 1 is fused are separated visually or mechanically.

<Separation process>
By the method described in the above embodiment, the pipe 1 and the electric fusion joint 2 are separated from the electric fusion joint 2 to which the pipe 1 is fused, and the heating wire 3 is further separated.

<Recycling process>
The terminal 5 is removed from the heating wire 3, and the heating wire and the terminal are separated and reused as a metal material. Since the heating wire 3 has a long shape without a cut portion between the terminals 5, it is easy to collect and store the separated heating wire 3 for shipping to a metal recycler.
By crushing the electric fusion joint 3, the pipe 1, and the used pipe from which the heating wire 3 is separated, and pulverizing pieces or pellets, raw materials for resin products other than pipes for gardening supplies, building materials, seals, etc., and low quality Reused as a raw material for pipes. In the present invention, since only the resin can be separated from the electric fusion joint 3 without cutting the heating wire 3 at all, the recycled resin product or pipe has a metal such as a cut piece of the heating wire 3 or metal powder. There is no risk of foreign matter entering.

<Washing process>
It is desirable to perform a cleaning process for removing foreign matters such as seals stuck to the pipes and joints and mud between the recovery process and the recycling process. In the conventional method of crushing the electric fusion joint and separating the resin and the heating wire, it was necessary to wash before crushing in order to prevent crushing even foreign matters such as seals. Since the fused electric fusion joint 2 is not crushed, the foreign matter can be removed or cleaned after the heating wire 3 is separated.

DESCRIPTION OF SYMBOLS 1 Piping, 2 Electrical fusion joint, 3 Heating wire, 4a Piping insertion part, 4t End surface, 5 Terminal, 8 Piping inner peripheral surface, 8p Piping inner peripheral wall, 10 Jig / separation jig, 11 Locking member, 12 Drawing Member, 12 taper portion, 16 inner peripheral surface of locking member, 17 outer peripheral surface of locking member, 18 divided body, 19 connecting member, 30 locking claw, 30a tip surface, L1 axis

Claims (8)

Heating the electric fusion joint having a pipe fused to the pipe insertion portion;
Inserting a jig provided with a locking claw in the pipe, and locking the locking claw to an inner peripheral wall or an end surface of the pipe; and
A method of separating a pipe and an electric fusion joint, comprising: pulling the jig toward the outside of the pipe insertion portion, and separating the pipe locked by the locking claw from the pipe insertion portion.   The method for separating a pipe and an electrofusion joint according to claim 1, wherein a tip of the locking claw is formed with a smooth surface facing the inner peripheral surface of the pipe.   The method for separating a pipe and an electric fusion joint according to claim 1 or 2, wherein the pipe is expanded by the heating, and the locking claw is locked to an inner peripheral wall or the end surface of the pipe. After the step of separating the pipe and the electrofusion joint by the method according to claim 1,
A method of separating a heating wire from an electric welding joint including a pipe having a step of drawing a terminal of the electric fusion joint and taking out a heating wire embedded in the pipe insertion portion. A locking member for locking to the inner peripheral wall or end surface of the pipe fused to the pipe insertion portion of the electric fusion joint;
A drawing member that moves the locking member to the opening end side of the pipe insertion portion,
The locking member is a separation jig for a pipe and an electric fusion joint that are formed so as to freely expand in diameter corresponding to the inner diameter of the pipe. The locking member connects a plurality of divided bodies formed by cutting a cylindrical member having a tapered inner circumferential surface and an outer circumferential surface in an axial direction, and the plurality of divided bodies so as to be expandable. A connecting member,
A locking claw protruding radially outward is formed on the outer peripheral surface of the divided body,
The pulling member gradually increases in diameter from the proximal end toward the distal end, and is formed with a tapered portion that can be closely fitted to the inner peripheral surface,
The diameter of the locking member is increased by moving the pulling member in the pulling direction with respect to the locking member in a state where the tapered portion is closely fitted to the inner peripheral surface. Separation jig for pipes and electric fusion joints.   The separation jig of the pipe and the electric fusion joint according to claim 6, wherein a tip of the locking claw is formed with a smooth surface facing the inner peripheral surface of the pipe.   A heating wire separated by the method according to claim 4.

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