JP4394929B2 - Pipe fixing tool - Google Patents

Description

  The present invention relates to a pipe fixing tool used when connecting a resin pipe via a fusion joint. More specifically, the present invention relates to a pipe fixing tool that can be easily attached to a pipe before connecting the pipe and removed from the pipe after connecting the pipe, and can cope with various pipe outer diameters.

  In recent years, polyethylene pipes have been frequently used for city gas piping. This is because polyethylene pipes are more resistant to corrosion and earthquake than conventional plated steel pipes, and are excellent in workability of piping work. In order to connect the polyethylene pipe, a method of fusion-bonding the outer peripheral surface of the end of the pipe and the inner peripheral surface of the EF joint using an electrofusion joint (EF joint) is generally used. Yes.

FIG. 8 is a perspective view showing a joining operation state of a resin pipe using a general EF joint. The EF joint 281 is a tubular body made of a thermoplastic such as polyethylene or polybudene, and is provided with a joint hole 282. A heating wire (not shown) is embedded in the joint body along the inner peripheral surface of the joint hole 282.
A pipe joining operation using the EF joint having such a configuration will be described. First, the resin pipe 283 to be joined to the joining hole 282 is inserted. Next, after fixing the pipe 283 with the pipe fixing tool 285, the heating wire is energized. The heating wire generates heat by Joule heat, melts polyethylene having a melting point of about 130 ° C., and integrates the pipe 283 and the EF joint 281. Thereby, the two pipes 283 can be connected via the EF joint 281.

  The reason for fixing the pipe 283 by the pipe fixing tool 285 during the joining operation is to fix the pipe 283 and the EF joint 281 during the fusion of the pipe 283 and the EF joint 281. If the pipe 283 is displaced in the EF joint 281 during the joining operation, there is a possibility that a defect occurs in the joint and the long-term life of the joint is deteriorated. Therefore, this fixing has a significant effect on the success or failure of the joining operation.

  The conventional pipe fixing tool 285 has two sets of clamp arms 286 for holding the outer peripheral surface of the pipe 283 on the left and right. After the pipe 283 is sandwiched by the clamp arm 286, the clamp handle 287 is turned to fix the clamp arm 286 by clamping. The shape and dimensions of the joint connecting pipe fixing tool 285 vary depending on the size of the EF joint 281 and the pipe 283 and the type of the EF joint 281.

The above-described conventional joint fixing pipe fixing tool has the following problems.
(1) When the pipe fixing tool is attached to the pipe, it is necessary to insert the pipe fixing tool into the lower part of the EF joint into which the pipe is inserted, or to place the pipe fixing tool in advance, which requires work man-hours.
(2) When placing the pipe fixing tool in advance, it was necessary to level the bottom of the work hole for embedding the pipe.
(3) Depending on the type (socket, elbow, cheese, etc.) and size of the EF joint, many types of pipe fixing tools had to be prepared.

  Therefore, the present applicant has proposed a pipe fixing tool for connecting a fusion joint (see Patent Document 1).

Japanese Patent Laid-Open No. 10-156737

However, this proposed pipe fixing tool also has the following insufficient points.
(1) It must be replaced with a chain with a different length according to the diameter of the pipe to be connected.
(2) In the pipe fixing tool according to the specific example of the above proposal, a double plastic comb chain is used as the winding means, but it is desirable to increase the strength of the chain.
(3) I want to be able to fix a pipe easily when two pipes with different diameters are connected with different diameter sockets.
(4) I want to reduce the storage space for storing tools.

  The present invention has been made in view of such problems, and an object thereof is to provide a pipe fixing tool for fusion splicing work that is easier to use.

To solve the above problems, pipes stationary tool of the present invention, there is provided a pipe fixing tool used to connect the two plastic pipe through the fused joint; pair to be respectively pressed against the respective pipe outer peripheral surface And a pair of winding members that are wound around each pipe outer peripheral surface and can be locked to each pressing portion, and the plurality of winding members are provided. A link connecting the plurality of links, and a roller disposed on an outer periphery of the pin, the link and the pin are made of metal, and the roller is made of resin, diameter of the roller is greater than the width of the link, especially the outer surface of the roller when the chain is wound on the plastic pipe, characterized in that the contact with the resin pipe outer peripheral surface To.
Since the chain is sufficiently strong, the pipe can be firmly tightened and there is no risk of scratching the outer peripheral surface of the pipe .

In the pipe fixing tool of the present invention, it is preferable that the connecting portion can be expanded and contracted. If the connecting portion is extended, the span between the two pressing portions can be lengthened, and if the connecting portion is shortened, the entire pipe fixing tool is reduced, which is convenient for carrying and storing.
Moreover, it is preferable that the said press part is rotatable with respect to the said connection part. Regardless of whether the joint type is a socket (straight pipe type) or an elbow, a single pipe fixing tool can handle various joints.

Furthermore, it is preferable to have a spacer that has a drop-off preventing means and is detachably inserted into the pressing portion and the outer peripheral surface of the pipe.
In this case, when two pipes having different diameters are fixed, it can be coped with by inserting a spacer between the outer peripheral surface of the small diameter side pipe and the pressing portion. Here, the spacer can be handled integrally with the pipe fixing tool by the means for preventing the spacer from falling off.

In pipes stationary tool of the present invention, it is preferable that the engaging portion between the pressing portion is formed in the longitudinal direction of the plurality of positions of the chain. If the engaging portions with the pressing portion are formed at a plurality of locations in the longitudinal direction of the chain, a plurality of types of pipes having different diameters can be handled with one pipe fixing tool without replacing the chain.

The pipe fixing tool of the present invention exhibits the following effects.
(1) The winding member is a chain having a resin roller and a metal link, and the roller comes into contact with the outer peripheral surface of the pipe when the chain winds around the pipe. Can be tightened and there is no risk of scratching the outer peripheral surface of the pipe.
(2) If the connecting part can be expanded and contracted, the span between the two pressing parts can be lengthened if the connecting part is extended, and if the connecting part is shortened, the entire pipe fixing tool becomes small and convenient for carrying and storing.
(3) If the length of the winding member is adjusted, a plurality of types of pipes having different diameters can be handled with one pipe fixing tool without replacing the winding means.
(4) If a spacer that is detachably inserted into the pressing portion and the outer peripheral surface of the pipe is provided, it can be coped with by inserting the spacer into the small-diameter side pipe when fixing two pipes having different diameters.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, it demonstrates, referring drawings.
FIG. 1 is a partial cross-sectional side view showing the overall configuration of a pipe fixing tool according to one embodiment of the present invention.
FIG. 2 is a plan view showing the entire pipe fixing tool of this embodiment.
FIG. 3 is a cross-sectional view showing the front of the pipe fixing tool of this embodiment.
FIG. 4 is a perspective view showing a main part of the pipe fixing tool of this embodiment.
FIG. 5 is a component diagram of the main body of the pipe fixing tool of the present embodiment.
FIG. 6 is a plan view of the chain of the pipe fixing tool of the present embodiment.

  FIG. 1 shows two resin pipes 5 on the left and right and a fusion joint 3. Ends 5 c of the two resin pipes 5 are inserted into the joint 3. The left and right pipes 5 are fixed to each other by the pipe fixing tool 1 of this embodiment. The pipe fixing tool 1 includes a pair of left and right pressing portions 13 and 14, a chain (winding member) 15, and a connecting portion 11 that connects both pressing portions.

Since the left and right pressing portions 13 and 14 are substantially bilaterally symmetrical, they will be described together.
As shown in FIGS. 3 and 4, the pressing portions 13 and 14 are configured with the main body 21 as the center. In this example, the main body 21 has a block shape made of an aluminum alloy, and the lower surface (pressing surface 21 c) is applied to the outer peripheral surface of the pipe 5. In addition, the up-down direction of FIG. 3, FIG. 4 is called up-down here.

  A chain clamp handle 50 and a connecting base 71 are mounted on the pressing portion main body 21. As shown in FIG. 3, one end (base end portion) 15 a of the chain 15 is attached to the pressing portion main body 21 via a clamp screw 45 and a clamp handle 50. The other end 15z of the chain 15 is locked to the main body 21 by dropping a locking pin 29 (35) protruding to the side of the chain into the locking groove 21a of the main body 21 as shown in FIG.

The connection base 71 is connected to the pressing portion main body 21 so as to be rotatable. The angle between the connecting base 71 and the main body 21 can be changed according to the type of joint.
In the case shown in FIG. 1, since the joint 3 is a straight tubular socket, the longitudinal direction of the coupling base 71 and the longitudinal direction of the pressing portion main body 21 are substantially orthogonal to each other. On the other hand, the case of FIG. 4 is a case where 90 ° elbow type joint is used, and the longitudinal direction of the connecting base 71 and the longitudinal direction of the main body 21 are inclined by 45 °. The mechanism for adjusting both angles will be described later.

The detail of a press part main body is demonstrated referring FIG.
5A is a plan view, FIG. 5B is a front sectional view, and FIG. 5C is a bottom view.
The lower surface 21c of the main body 21 shown in FIG. 5 (B) is a surface pressed against the outer peripheral surface of the pipe as described above. The main body 21 is roughly divided in the left-right direction of FIG. 5 and is composed of a right chain tip locking portion 21b, a center portion 21f, and a clamp handle mounting portion 21n. The chain end locking portion 21b has a bifurcated structure protruding in a cantilevered shape to the right from the central portion 21f. The clamp handle mounting portion 21n is raised obliquely above the central portion 21f and has a recess 21p on the lower surface.

  A U-shaped locking groove 21a is formed on the upper surface of the chain tip locking portion 21b. As shown in FIG. 4, a locking pin 29 (or 35, see FIG. 6) at the tip (or midway) of the chain 15 is dropped into the locking groove 21a and locked. As shown in FIG. 6, a large number of locking pins 29 and 35 are formed in the chain 15 in accordance with the outer diameter of the pipe that is symmetrical in connection work. By locking any of the locking pins 29 and 35 in the main body locking groove 21a in accordance with the pipe, it is possible to easily fix the pipes of various outer diameters with the single chain 15.

The upper surface of the central portion 21f of the main body 21 is a flat connecting table slide surface 21e. As shown in FIG. 5A, a screw hole 21h, a knock hole 21g, a mark 21j, and the like are formed on the surface 21e.
As shown in the left main body 21 in FIG. 1, a connecting base rotation center shaft 75 is fixed to the screw hole 21h. The shaft 75 is a rotation center axis of the connection base 71.

Four knock holes 21g are arranged on an arc having a certain radius centered on the screw hole 21h. These holes 21g form an angle with each other (for example, 11 ° 15 ′, 22 ° 30 ′, 45 °). Further, as shown in the left main body 21 of FIG. 1, spring pins (knock pins) 73 are fitted into these holes 21g. By this fitting, the relative angle between the connection base 71 and the main body 21 is determined.
This mark 21j is used to display the angle between the connecting base 71 and the main body 21 as shown in FIG.

A clamp screw through hole 21m is formed in the clamp handle mounting portion 21n of the pressing portion main body 21. As shown in FIG. 3, a handle base 47 is fitted into the hole 21m. The handle base 47 is screwed with the clamp screw 45. When the clamp handle 50 is turned, the handle base 47 is also rotated synchronously, and the clamp screw 45 is moved up and down accordingly, and the inner periphery of the chain 15 is enlarged / reduced.
As shown in FIG. 3, the lower part of the chain guide roller 23 and the clamp screw 45 is accommodated in the recess 21p below the clamp handle mounting portion 21n. As shown in FIG. 5B, a mounting hole 21r for a guide roller supporting pin (reference numeral 25 in FIG. 3) is formed in the side wall 21s of the recess 21p.

  As shown in FIG. 5C, two spacer engaging holes 21u are formed in the center of the lower surface 21c of the pressing portion main body 21. As shown in FIG. As shown in FIG. 7A, the pin 103 and the O-ring 105 of the pipe outer diameter adjusting spacer 101 are inserted into this hole.

Next, the structure of the chain 15 will be described with reference to FIGS.
A clamp screw 45 is provided at the base end 15a of the chain 15 (lower end in FIG. 6). The clamp screw 45 is a relatively long screw and is screwed to the handle base 47 as shown in FIG. The clamp screw 45 is rotatably connected to the link of the base end 15a of the chain 15 by a pin.

The main body of the chain 15 includes links 37 and 39, pins 33, and rollers 31. Here, the links 37 and 39 and the pin 33 are made of stainless steel (SUS304). The roller 31 is made of resin (polyacetal). The diameter of the roller 31 is larger than the width of the links 37 and 39, and the outer surface of the roller 31 is in contact with the outer peripheral surface of the pipe when the chain 15 is wound around the pipe.
Thus, since the links 37 and 39 of the chain 15 are made of metal, the strength of the chain can be sufficiently taken and the pipe can be tightened firmly. However, even in that case, since the outer surface of the resin roller 31 is in contact with the outer peripheral surface of the pipe and the links 37 and 39 are not in contact with the outer periphery of the pipe, there is no possibility of damaging the pipe.

  Some pins of the chain 15 near the tip 15z are made long and protrude on both sides of the chain 15. That is, it is the locking pins 29-1 to 3 and 35-1 to 4 from the tip 15z side. As shown in FIG. 4, these locking pins 29 and 35 are dropped into the locking groove 21 a of the pressing portion main body 21 to lock the tip of the chain 15 to the pressing portion main body 21. The plurality of locking pins 29 and 35 are provided in order to adjust the length of the chain 15 according to various outer diameter pipes.

In addition, the pipe diameter corresponding to each locking pin 29 and 35 in this example is as follows. The spacer will be described later.
Locking pin 29-1: 200A
29-2: 150A
29-3: 100A
35-1: 150A plus spacer x 200A
35-2: 100A plus spacer x 200A
35-3: 100A plus spacer x 150A
35-4: 75A plus spacer x 100A
Here, the reason why the locking pin 29 is made slightly longer than the locking pin 35 is to make it easier to select a pin in the work that is normally performed (same diameter pipe connection).

  A knob 27 is connected to the tip 15z of the chain 15. The knob 27 has a relatively short round bar shape. When the locking pins 29 and 35 are locked to the pressing portion main body 21, the chain 15 is handled with this knob.

Next, the clamp structure (clamp handle 50) on the proximal end side of the chain 15 will be described with reference to FIG.
As described above, the clamp screw 45 is connected to the base end 15 a of the chain 15. The clamp screw 45 extends upward through the hole 21m of the clamp handle mounting portion 21n of the pressing portion main body 21. The internal thread of the handle base 47 is screwed into the external thread of the clamp screw 45.

  The handle base 47 has a stepped bush shape, and the upper outer diameter is large and the lower outer diameter is small. The lower portion of the handle base 47 is fitted into the hole 21m of the pressing portion main body 21 via a dry met bush 51 (for example, 70B-1815 manufactured by Oiles Kogyo). A step portion between the upper portion and the lower portion of the handle base 47 is in contact with the upper surface of the clamp handle attachment portion 21n via a dry mether 49 (for example, 70W-1815 manufactured by Oiles Kogyo). The handle base 47 rotates in the hole 21m.

  A handle 61 is implanted on the upper side surface of the handle base 47 via a hexagon socket set screw 59. When the handle 61 is turned, the handle base 47 rotates, and the clamp screw 45 screwed with the handle base 47 moves up and down. Then, the inner periphery of the chain 15 wound around the outer periphery of the pipe 5 changes, and the winding force of the chain 15 on the pipe 5 can be adjusted.

A spring pin 55 is attached to the top of the clamp screw 45 so as to penetrate in the lateral direction and protrude to the side of the screw 45. The spring pin 55 hits the top of the handle base 47 when the clamp screw 45 is lowered. At this point, the clamp screw 45 cannot be lowered any further. The spring pin 55 is attached after the clamp screw 45 is assembled to the handle base 47.
An upper outer periphery and an upper surface of the handle base 47 are covered with a screw cover 57.

  A guide roller 23 exists on the chain base end portion 15a. The guide roller 23 is rotatably attached around the spring pin 25. The lower surface of the guide roller 23 abuts on the upper surface of the chain base end portion 15 a to bring the chain 15 along the outer periphery of the pipe 5.

Next, the structure of the connecting portion 11 that connects the left and right pressing portions 13 and 14 will be described.
A connection base 71 is mounted on the pressing portion main body 21. The structure between the two will be described with reference to the pressing portion main body 21 and the connecting base 71 shown on the left side of FIG.

A shaft 75 is implanted in the screw hole 21 h of the main body 21. The shaft 75 has a cylindrical shape. The connection base 71 has a hole 71 a fitted to the shaft 75, and can rotate around the shaft 75.
A spring pin 73 is planted on the lower surface of the connecting table 71. The lower end of the spring pin 73 protrudes below the lower surface of the connection base 71 and enters the knock hole 21g of the pressing base body 21 shown in FIGS.

  A fixing knob 79 is screwed into the upper end portion of the shaft 75 via a washer 77. When the knob 79 is turned and loosened, the connection base 71 can be lifted up. When the connection base 71 is raised slightly upward, the spring pin 73 is detached from the knock hole, and the connection base 71 can be rotated. On the other hand, when the spring pin 73 is aligned with the knock hole and the knob 79 is tightened, the connecting base 71 and the pressing portion main body 21 cannot be rotated. By this knob operation and the spring pin, the angle between the connecting base 71 and the pressing portion main body 21 can be adjusted, and it is possible to cope with pipe connection work using a straight pipe socket or cheese of various angles. 3 and 4, the line 71 c on the side wall surface of the connection base 71 is an angle display mark.

A hole 71 e is formed in the upper side surface of the connection base 71. The left end portion of the connecting rod 81 is fitted into the hole 71e. The connection base 71 and the connection rod 81 are fixed by spring pins 80.
On the other hand, a connection pipe 89 is fixed to the right connection base 71 in FIG. 1 by the same structure.

  The right end portion of the connecting rod 81 enters the inner hole 89a of the connecting pipe 89, and the connecting rod 81 can slide in the left and right direction in FIG. 1 within the connecting pipe inner hole 89a. A groove 81a is cut into the bottom surface of the connecting rod 81 so as to extend in the longitudinal direction. A locking screw 87 enters the groove 81a. The screw 87 is fixed to the adapter 85 at the left end of the connecting pipe 89 and the connecting rod 81 itself. Therefore, the connecting pipe 89 and the connecting rod 81 are prevented from rotating about the axis.

A wing bolt 83 is attached to the adapter 85. When the butterfly bolt 83 is tightened, the tip of the butterfly bolt pushes the upper surface of the connecting rod 81, the connecting rod 81 and the connecting pipe 89 cannot slide, and the length of the connecting portion 11 is fixed. On the other hand, when the butterfly bolt 83 is loosened, the connecting rod 81 can slide in the connecting pipe 89, and the length of the connecting portion 11 can be changed. The position of the right pressing portion 13 ′ shown by a two-dot chain line in FIG. 2 is a state (length L 1) in which the connecting portion 11 is the shortest.
If the connecting portion is extended, the span between the two pressing portions can be lengthened (length L2), which can correspond to the work using a large joint. On the other hand, if the connecting portion is shortened, the entire pipe fixing tool is reduced, which is convenient for carrying and storing.

Next, the whole usage method of the pipe fixing tool of a present Example is demonstrated collectively.
First, when not in use, the connecting portion 11 is usually the shortest. This saves space for storage.
When the pipe fixing tool is used, the butterfly bolt 83 is loosened and the connecting rod 81 is taken out so that the connecting portion 11 has an appropriate length. Thereafter, the butterfly bolt 83 is tightened to fix the distance between the left and right pressing portions 13 and 14.

  Next, the angles of the pressing portion main body 21 and the connecting base 71 are adjusted according to the form of the joint 3 used for the pipe fusion work at that time. At this time, the knob 79 is loosened to align the positioning pin 73 and the knock hole 21g, and then the knob 79 is tightened to fix the angle of the pressing portion main body 21 and the connecting base 71.

Next, the left and right pressing portion main bodies 21 are placed on the left and right pipes 5. Then, the chain 15 is turned to the outer peripheral surface of the pipe, and the locking pins 29 and 35 corresponding to the diameter of the pipe 5 are inserted into the locking groove 21 a of the pressing portion main body 21.
Next, the clamp screw tightening handle 50 is turned to pull up the clamp screw 45, and the chain 15 and the pressing surface 21 c of the pressing portion main body are brought into close contact with the outer surface of the pipe 5.

Next, a case where pipes having different diameters are connected will be described.
FIG. 7A is a side view showing a state of work for connecting pipes having different diameters. FIG. 7B is a front view showing an example of a spacer used for the work.
In this operation, the small-diameter pipe 111 on the left side and the large-diameter pipe 115 on the right side are connected via the different-diameter socket 113. At this time, the pipe fixing tool 1 is the same as that used for pipe connection work with the same diameter. And the press part 13 applied to the right large diameter pipe 115 is the same state as the operation | work of FIG.

On the other hand, a spacer 101 is interposed between the left pressing portion 14 and the small diameter pipe 111.
As shown in FIG. 7B, the spacer 101 includes a spacer main body 101, a pin 103 planted on the top thereof, and an O-ring 105 fitted on the outer periphery of the base of the pin 103.

The spacer body 101 has an eight-character shape as a whole. The upper surface 101 a of the spacer main body 101 hits the lower surface of the pressing portion main body 21, and the lower surface 101 c of the spacer main body 101 is pressed against the outer peripheral surface of the pipe 111.
The thickness of the spacer body 101 eliminates the step on the upper surface of the left and right pipes 111 and 115 (H in the figure), and the same pipe fixing tool 1 can be used even in the case of a different diameter pipe structure.

  As shown in FIG. 7A, two pins 103 of the spacer 101 are provided in the longitudinal direction of the pipe. Each pin 103 is fitted into a pin hole 21 u on the lower surface of the pressing portion main body 21. Then, an O-ring (friction locking member) 105 is pressed against the inner wall of the pin hole, and the spacer main body 101 is locked to the pressing portion main body by the friction force. Therefore, the spacer 101 is not accidentally dropped during the operation, and the operation is facilitated.

Although one embodiment of the present invention has been described above, various improvements / additions such as the following can be made.
(1 ) An angle setting between the pressing portion main body and the connecting base can be performed with one touch.
( 2 ) The length of the connecting rod and connecting pipe can be set with one touch.

It is a partial cross section side view showing the whole pipe fixing tool composition concerning one example of the present invention. It is a top view which shows the whole pipe fixing tool of a present Example. It is sectional drawing which shows the front of the pipe fixing tool of a present Example. It is a perspective view which shows the principal part of the pipe fixing tool of a present Example. It is component drawing of the main body of the pipe fixing tool of a present Example. 5A is a plan view, FIG. 5B is a front sectional view, and FIG. 5C is a bottom view. It is a top view of the chain of the pipe fixing tool of a present Example. FIG. 7A is a side view showing a state of work for connecting pipes having different diameters, and FIG. 7B is a front view showing an example of a spacer used for the work. It is a perspective view which shows the joining operation condition of the resin pipe using a general EF coupling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe fixing tool 3 Joint 5 Resin pipe 5c End part 11 Connection part 13, 14, 13 'Press part 15 Chain (winding member) 15a, 15z End 21 Main body 21a Locking groove 21b Chain front end locking part 21c Press surface (lower surface) )
21e Connection slide surface (upper surface) 21f Center part 21g Knock hole 21h Screw hole 21j Mark 21m Clamp screw through hole 21n Clamp handle attachment part 21p Recess 21r Guide roller pin attachment hole 21s Side wall 21u Spacer engagement hole 23 Guide roller 25 Spring pin 27 Knob 29 Locking pin (long) 31 Resin roller 33 Chain pin 35 Locking pin (short)
37, 39 Link 45 Clamp screw 47 Handle base 49 Drymet washer 50 Clamp handle 51 Drymet bush 53 C-type retaining ring 55 Spring pin 57 Screw cover 59 Hexagon socket set screw 61 Handle 71 Connecting base 71a Hole 71c Wire 71e Hole 73 Spring pin 75 Shaft 77 Washer 79 Fixing knob 80 Spring pin 81 Connecting rod 81a Groove 83 Butterfly bolt 85 Adapter 87 Positioning screw 89 Connecting pipe 89a Inner hole 101 Spacer 101a Upper surface 101c Lower surface 103 Pin 105 O-ring 111, 115 Pipe 113 Different diameter socket 281 EF joint 282 Joint hole 283 Resin pipe 285 Pipe fixing tool 286 Clamp arm 287 Tightening handle

Claims (4)

A pipe fixing tool used when connecting two resin pipes via a fusion joint;
A pair of pressing portions respectively pressed against the outer peripheral surface of each pipe;
A connecting portion for connecting the pair of pressing portions to each other;
A pair of winding members that are respectively wound around the outer peripheral surfaces of the pipes and can be locked to the pressing portions; and
The winding member is a chain having a plurality of links, a pin connecting the plurality of links, and a roller disposed on the outer periphery of the pin,
The link and the pin are made of metal, and the roller is made of resin,
Diameter of the roller is greater than the width of the link, pipe fixing tool outer surface of the roller when the chain is wound on the plastic pipe, characterized in that the contact with the resin pipe outer peripheral surface. The pipe fixing tool according to claim 1, wherein the connecting portion is extendable. The pipe fixing tool according to claim 1, wherein the pressing portion is rotatable with respect to the connecting portion. The pipe fixing tool according to claim 1, 2, or 3 , wherein engaging portions with the pressing portion are formed at a plurality of locations in the longitudinal direction of the chain .

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