JP2017172793A - Electric fusion retainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer that can temporarily fix an electric fusion joint to a resin even in a narrow space.SOLUTION: A retainer 30 temporarily fixes an electric fusion joint 10 and a resin pipe 20 so as to surround them in a state where the end part of the resin pipe 20 is inserted into a socket 11 of the end part of the electric fusion joint 10. The retainer 30 comprises: first and second holding members 31 and 32 located at both ends in a circumferential direction; an intermediate holding member 33 located at an intermediate position in the circumferential direction; flexible metal bands 35 and 36 that connect the first holding member 31, the intermediate holding member 33, and the second holding member 32 in a spaced state to each other in this order; and a fastening tool 37 for detachably coupling the first holding member 31 to the second holding member 32. The holding members 31, 32, and 33 include: joint holding parts 31a, 32a, and 33a that touch the circumference of the electric fusion joint 10; and pipe holding parts 31b, 32b, and 33b that touch the circumference of the resin pipe 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fixing device that is used when electric welding is performed between a resin pipe and an electric fusion joint.

  It is known to use an electric fusion joint (hereinafter referred to as a joint) when connecting resin pipes. This joint has receiving ports at both ends, and ends of the resin pipes are inserted into these receiving ports. A heating element is embedded in the inner periphery of each joint opening of the joint. When the heating element is energized through a terminal portion protruding from the outer periphery of the joint, the inner periphery of the joint and the outer periphery of the resin pipe are melted, and the joint and the resin pipe are melted. Are fused.

From the start of energization to the joint until the molten resin cools and solidifies, the resin pipe and the joint are temporarily fixed by a fixing device so that no external force acts.
The fixing device disclosed in Patent Document 1 includes a pair of holding members, a hinge that connects one ends of the holding members, and a fastener that fastens the other ends of the holding members in a detachable manner. And.

  Each holding member integrally has a joint holding part and a pipe holding part adjacent in the axial direction (axial direction of the joint and the resin pipe). The inner peripheries of these joint holding part and pipe holding part form a semi-cylindrical surface. With the pair of holding members fastened with the above-mentioned fasteners, the joint terminal portion penetrates the through hole provided in the joint holding portion, and the tube holding portion abuts on the outer periphery of the resin tube, These joints and the resin pipe are temporarily fixed.

Japanese Patent No. 4936716

  The fixing device of Patent Document 1 can be attached to a pipe (a joint and a resin pipe inserted into both ends of the joint) by a simple operation by simply tightening the holding member with a fastener, but particularly when the target diameter is increased. Requires a large working space. Therefore, when the space around the piping is limited, for example, in a pipe shaft of an apartment house, it may be difficult to attach the fixing device to the piping.

In order to solve the above-described problems, the present invention temporarily fixes an electric fusion joint and a resin pipe so as to surround the electric fusion joint and a resin pipe inserted into an end opening of the electric fusion joint. In the fixing device, the first and second holding members located at both ends in the circumferential direction, at least one intermediate holding member located in the middle in the circumferential direction, the first holding member, the intermediate holding member, and the second A flexible connecting member that connects the holding members in a separated state in this order; and a fastener that detachably fastens the first holding member and the second holding member. The second holding member and the intermediate holding member each have a joint holding portion and a tube holding portion that are adjacent in the axial direction. When the temporary fixing is performed, the joint holding portion touches the outer periphery of the electrofusion joint. The tube holding part is in contact with the outer periphery of the resin tube. And butterflies.
According to the above configuration, the holding member is divided into at least three in the circumferential direction, and these holding members are connected by the flexible connecting member, so that the work space is small and the surrounding space is limited. Even if there is, you can wear the fixing device.

Preferably, the connecting member has a belt shape and is fixed to the outer surfaces of the first and second holding members and the intermediate holding member.
According to the above configuration, the connecting member has a belt shape and has good flexibility, and the holding member can be applied with the tightening force of the tightening tool from the outer surface thereof, so that secure temporary fixing is possible. .

Preferably, the connecting member continues from the first holding member through the intermediate holding member to the second holding member.
According to the said structure, the structure of a connection member can be simplified.

Preferably, a plurality of the connecting members are arranged apart in the axial direction.
According to the said structure, the connection member can provide the fastening force of a fastener to each holding member, hold | maintaining favorable flexibility.

Preferably, the joint holding part and the pipe holding part of the intermediate holding member are separated, and the plurality of connecting members are fixed to the joint holding parts of the first and second holding members and the intermediate holding member. And a second connecting member fixed to the pipe holding portion of the first and second holding members and the intermediate holding member.
According to the above configuration, since the joint holding part and the pipe holding part of the intermediate holding member are relatively movable in the radial direction, even if there is a molding error between the outer diameter of the electrofusion joint and the outer diameter of the resin pipe, Can be absorbed.

Preferably, the joint holding portion and the tube holding portion of the intermediate holding member are connected by a connecting means that prohibits relative movement in the axial direction and allows relative movement in the radial direction.
According to the above configuration, since the relative movement in the axial direction is prohibited even if the joint holding part and the pipe holding part of the intermediate holding member are separated, the joint holding part and the pipe holding of the intermediate holding member when the fixing device is mounted. The portion can be positioned smoothly and the resin pipe can be prevented from coming out of the joint receiving port.

  Preferably, the coupling means has a screw, and the screw penetrates a long hole having a cross-sectional shape elongated in the radial direction formed in the tube holding portion of the intermediate holding member, and the joint holding portion of the intermediate holding member. Screwed into.

  Preferably, any one of the first and second holding members and the intermediate holding member is formed with a through-hole penetrating in a radial direction, and the electric fusion joint is used for the temporary fixing. The terminal portion protruding in the radial direction from the outer periphery of the metal enters the through hole.

Preferably, a tension applying structure is further provided, and this tension applying structure applies tension to the connecting member by pushing the connecting member radially outward of the electric fusion joint and the resin pipe.
According to the said structure, by providing tension | tensile_strength to a connection member, an electrofusion joint and a resin pipe can be reliably temporarily fixed in an electrofusion process.

Preferably, the connecting member is fixed to the outer surfaces of the first and second holding members and the intermediate holding member, the tension applying structure includes a receiving member and a displacement means, and the receiving member is The displacement member is disposed between the outer periphery of the holding member selected from the first and second holding members and the intermediate holding member and the connecting member, and the displacing means moves the receiving member to the selected holding member. By floating from the outer periphery, tension is applied to the connecting member hung on the receiving member.
According to the said structure, tension | tensile_strength can be provided to a connection member comparatively easily by floating a receiving member.

Preferably, the receiving member has a screw hole penetrating in a radial direction of the electric fusion joint and the resin pipe, and the displacement means has a screw member screwed into the screw hole of the receiving member. The tip of the screw member hits the outer periphery of the selected holding member, and the receiving member floats from the outer periphery of the selected holding member.
According to the said structure, the structure of a displacement means can be simplified.

Preferably, the receiving member has the same cross-sectional shape along the axial direction of the electric fusion joint and the resin pipe, and a hooking surface that forms a convex curved surface radially outward of the electric fusion joint and the resin pipe The connecting member has a band shape and is hung on the hooking surface of the receiving member, and has an insertion hole at a position corresponding to the screw hole, and the screw member is connected to the connecting member. Is inserted into the screw hole of the receiving member through the insertion hole.
According to the above configuration, the band-shaped connecting member can be stably hung on the hanging surface of the receiving member.

Preferably, the receiving member has a length that is the same as the width of the connecting member, and the receiving member is disposed between the selected holding member and the connecting member. Both end faces coincide with both side edges of the connecting member, and the tension applying structure further has a rotation preventing member. The rotation preventing member includes a main plate portion having the same length as the width of the connecting member, and the main plate. The main plate portion is formed with an insertion hole, and the main plate portion of the anti-rotation member is connected to the receiving member via the connecting member. The screw member is inserted into the insertion hole of the main plate portion and the connection in a state where the pair of engagement plate portions are engaged with both side edges of the connection member and both end surfaces of the receiving member. It is screwed into the screw hole of the receiving member through the insertion hole of the member.
According to the above configuration, when the screw member is screwed to float the receiving member, the rotation of the receiving member can be prohibited by the rotation preventing member.

  According to the present invention, even if the surrounding space is narrow, the fixing device can be attached to the joint and the resin pipe.

(A) is a longitudinal cross-sectional view which shows the state which inserted the edge part of the resin pipe | tube into the electrofusion joint, (B) is a II sectional view taken on the line in FIG. 1 (A). (A) is a longitudinal cross-sectional view which shows the state which mounted | wore the said electrofusion joint and the resin pipe | tube with the fixing device based on 1st Embodiment of this invention, (B) is the II-II arrow in FIG. 2 (A). FIG. It is a front view shown in the state where the above-mentioned fixing device was opened. It is a perspective view which shows the intermediate holding member of the said fixing device. It is a figure equivalent to Drawing 2 (B) showing a fixing device concerning a 2nd embodiment of the present invention. It is an expansion perspective view which shows the principal part of the fixing device of the said 2nd Embodiment. It is an expanded sectional view which shows the principal part. It is a perspective view which decomposes | disassembles and shows the receiving member and anti-rotation member which are the components of the principal part.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, the code | symbol 10 shows an electric fusion joint (henceforth a coupling). The joint 10 is made of, for example, polyethylene and has a cylindrical shape, and has receiving ports 11 at both ends. A heating element 12 made of a heating wire is embedded in the inner periphery of each of the receptacles 11. At both ends of the joint 10, terminal portions 13 that protrude radially and outwardly from the outer periphery thereof are provided. Each terminal portion 13 includes a convex portion 13a having a counterbore formed integrally with the joint 10, and a terminal 13b whose inner end is connected to the end of the heating element 12 and whose outer end faces the counterbore hole of the convex portion 13a. And have.

  For example, end portions of a resin pipe 20 made of polyethylene are inserted into the receiving ports 11 at both ends of the joint 10.

As shown in FIG. 2, the fixing device 30 is attached to both ends of the joint 10 with the resin pipe 20 inserted into the joint 10.
As shown in FIGS. 2 and 3, the fixing device 30 includes three holding members separated in the circumferential direction, that is, a first holding member 31 and a second holding member 32 positioned at both ends in the circumferential direction, and a circumferential direction. And an intermediate holding member 33 located in the middle.

  The holding members 31, 32, and 33 have joint holding portions 31a, 32a, and 33a adjacent to each other in the axial direction, and tube holding portions 31b, 32b, and 33b, respectively. The joint holding part 31a and the pipe holding part 31b of the first holding member 31 are integrated and connected, and the joint holding part 32a and the pipe holding part 32b of the second holding member 32 are also connected integrally, but the intermediate holding member The joint holding part 33a and the pipe holding part 33b of 33 are separated as shown in FIGS. 2A and 4 and are separate members.

  The joint holding portion 33a and the tube holding portion 33b of the intermediate holding member 33 are connected by a screw 34 (connecting means) so that relative movement in the axial direction is prohibited and relative movement in the radial direction is possible. As shown in FIG. 2A, the screw 34 extends in the axial direction, passes through a long hole 33x having a cross-sectional shape elongated in the radial direction formed in the tube holding portion 33b, and is screwed into the joint holding portion 33a. . The side surfaces of the joint holding portion 33a and the pipe holding portion 33b facing each other are flat surfaces so as not to disturb the relative movement in the radial direction.

The inner peripheries of the joint holding portions 31 a, 32 a, 33 a are arc surfaces having the same curvature as the outer peripheral surface of the joint 10, and the inner peripheries of the tube holding portions 31 b, 32 b, 33 b are equal to the outer peripheral surface of the resin pipe 20. It has a curved arc surface. On the inner periphery of the joint holding portions 31a, 32a, 33a and the inner periphery of the tube holding portions 31b, 32b, 33b, a large number of protrusions 39 extending in the circumferential direction are arranged in the axial direction.
A through-hole 31x is formed in the joint holding portion 31a of the first holding member 31 so as to perform an action described later.

  The fixing device 30 further includes two thin (several) metal strips 35, 36 (flexible) that connect the first holding member 31, the intermediate holding member 33, and the second holding member 32 in this order while being separated from each other. And a fastening member 37 that detachably fastens the first holding member 31 and the second holding member 32. The metal bands 35 and 36 also have elasticity, and when the tensile stress is applied, they extend slightly.

The metal bands 35 and 36 are arranged apart from each other in the axial direction. Both end portions of the metal strip 35 (first connecting member) are fixed to the outer surfaces of one end in the circumferential direction of the joint holding portion 31a of the first holding member 31 and the joint holding portion 32a of the second holding member 32, respectively. The intermediate portion is fixed along the outer surface of the joint holding portion 33 a of the intermediate holding member 33.

  Both ends of the metal strip 36 (second connecting member) are respectively fixed to the outer surfaces of one end in the circumferential direction of the tube holding portion 31b of the first holding member 31 and the tube holding portion 32b of the second holding member 32, The intermediate portion is fixed along the outer surface of the tube holding portion 33 b of the intermediate holding member 33.

The fastener 37 has a well-known structure, and will be briefly described with reference to FIG. A bracket 37 a is fixed to the outer surface of the other end of the second holding member 32. The base end portion of the link 37b is rotatably connected to the bracket 37a, and the base end portion of the clamp 37c is rotatably connected to the distal end portion of the link 37b and slidable in the longitudinal direction of the link 37b. Yes.
A rotation shaft for connecting the bracket 37a and the link 37b is denoted by reference numeral 37x, and a rotation shaft fixed to the proximal end portion of the clamp 37c is denoted by reference numeral 37y. The rotation shaft 37y is inserted and supported in an elongated hole (not shown) formed at the tip of the link 37b. This long hole extends in the longitudinal direction of the link 37b. The link 37b incorporates a compression spring (not shown), and the rotation shaft 37y is urged away from the rotation shaft 37x by the compression spring.
On the outer periphery of the other end of the first holding member 31, there is provided a clamp receiver 37d on which the tip of the clamp 37c is detachably locked.

  As shown in FIG. 3, the fixing device 30 in a state where the first holding member 31 and the second holding member 32 are separated is turned to each end portion of the joint 10 in which the resin pipe 20 is inserted, and the holding members 31 to 33 are connected. With the joint holding portions 31 a to 33 a applied to the outer periphery of the joint 10 and the tube holding portions 31 b to 33 b applied to the outer periphery of the resin tube 20, the tip of the clamp 37 c of the second holding member 32 is placed on the first holding member 31. The clamp 37c is hooked on the clamp receiver 37d, and the clamp 37c is set on the bracket 37a with the rotation of the link 37b.

  As described above, the fixing device 30 is mounted on the pipe composed of the joint 10 and the resin pipe 20, but the holding members 31 to 33 are separated into three in the circumferential direction, the circumferential dimension is short, and these holding members Since 31 to 33 are connected by flexible metal bands 35 and 36, the fixing device 30 can be easily mounted even if the space around the pipe is narrow.

  In the mounted state, the terminal portion 13 of the joint 10 is inserted into the through hole 31x formed in the first holding member 31, and the terminal 13b is exposed to the outside.

  The force of the compression spring acting on the clamp 37c is tightened in the direction in which the first holding member 31 and the second holding member 32 are attracted to each other, and the entire fixing device 30 receives a force in the diameter reducing direction. The joint holding portions 31 a to 33 a are pressed against the outer periphery of the joint 10, and the tube holding portions 31 b to 33 b of the holding members 31 to 33 are pressed against the outer periphery of the resin tube 20. As a result, the joint 10 and the resin pipe 20 can be temporarily fixed. In addition, since the protrusion 39 extended in the circumferential direction is formed in the inner periphery of these joint holding | maintenance parts 31a-33a and pipe | tube holding | maintenance parts 31b-33b, the temporary fixation of the joint 10 and the resin pipe | tube 20 is strengthened more. be able to.

  In this embodiment, since the joint holding part 33a and the pipe holding part 33b of the intermediate holding member 33 are separated, even if there is a molding error between the outer diameter of the joint 10 and the outer diameter of the resin pipe 20, the joint holding part. It can absorb by moving 32a and the pipe holding part 32b relatively in the radial direction. Furthermore, since the metal strips 35 and 36 can extend only slightly, a forming error can be absorbed.

  When the cord from the power source is connected to the pair of terminals 16 of the joint 10 in the temporarily fixed state and the heating element 15 is energized, the inner periphery of the joint 10 and the outer periphery of the resin tube 20 are melted, and both are fused. By the cooling and solidification of the molten resin, the connection between the joint 10 and the resin pipe 20 is completed. Thereafter, the fastening state of the fastening device 30 by the fastening tool 37 is released, and the fastening device 30 is removed from the pipe.

  In the present embodiment, the metal band 35 connecting the joint holding portions 31a, 32a and the joint holding portion 32a is curved in contact with the outer surface of the joint 10, but the tube holding portions 31b, 32b, the tube holding portion 33b, The metal band 36 connecting the two is in a straight state away from the outer periphery of the resin tube 20. In order to absorb the difference in the shape of the metal bands 35 and 36 in this mounted state, the metal band 36 is formed slightly shorter than the metal band 35 or the metal bands 35 and 36 are made equal in length to hold the tube of the intermediate holding member. It is preferable that the portion 33b slightly protrudes in the radial direction from the outer periphery of the joint holding portion 33a.

Next, a fixing device 30A according to a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, components corresponding to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The fixing device 30A is configured by adding a tension applying structure 40 to the fixing device 30 of the first embodiment.

  On the outer periphery of the first holding member 31, a flat receiving surface 31 s that is orthogonal to the radial direction of the joint 10 and the resin pipe 20 is formed at the opposite end of the fastener 37. The end of the metal band 35 is fixed to a portion of the outer periphery of the first holding member 31 that is adjacent to the receiving surface 31 s beyond the receiving surface 31 s. The end of the metal strip 36 is fixed to the receiving surface 31s.

The tension imparting structure 40 imparts tension to the metal band 35 and includes a receiving member 41, a thumbscrew 42 (screw member; displacement means), and a rotation preventing member 43.
The receiving member 41 has a semi-cylindrical shape, has the same cross-sectional shape along the axial direction of the joint 10 and the resin tube 20, has a flat contact surface 41a on the radially inner side of the joint 10 and the resin tube 20, and is radially A hooking surface 41b made of a cylindrical surface (convex curved surface) is provided on the outside. The length of the receiving member 41 in the axial direction, in other words, the distance between both end faces 41 c is equal to the width of the metal strip 35.
In the center of the receiving member 41, a screw hole 41x that penetrates the joint 10 and the resin pipe 20 in the radial direction is formed.

The receiving member 41 is set between the receiving surface 31 s of the first holding member 31 and the metal band 35. In this set state, the metal band 35 is hung on the hooking surface 41 b of the receiving member 41, and both end faces 41 c of the receiving member 41 coincide with both side edges of the metal band 35.
In the metal band 35, an insertion hole 35x that is elongated in the longitudinal direction is formed at a position corresponding to the screw hole 41x of the receiving member 41.

The anti-rotation member 43 is made of a metal plate, and has a U-shape including a main plate portion 43a and a pair of locking plate portions 43b that are connected to both ends of the main plate portion 43a and are orthogonal to the main plate portion 43a. The main plate portion 43 a has a length equal to the width of the metal strip 35.
In the set state of the rotation preventing member 43, the main plate portion 43 a rides on the hooking surface 41 b of the receiving member 41 via the metal band 35, and the pair of locking plate portions 43 b are connected to both side edges of the metal band 35 and both ends of the receiving member 41. Locked to the surface 41c.
An insertion hole 43x having a larger diameter than the screw hole 41x of the receiving member 41 is formed in the center of the main plate portion 43a.

  In a state where the receiving member 41 and the rotation preventing member 43 are set as described above, the male screw portion 42a of the thumbscrew 42 passes through the insertion hole 43x of the rotation stopping member 43 and the insertion hole 35x of the metal band 35, and the screw of the receiving member 41 Screwed into the hole 41x.

  Before the tip of the male screw portion 42 a reaches the contact surface 41 a of the receiving member 41, the contact surface 41 a contacts the receiving surface 31 s of the first holding member 31. When the thumb screw 42 is screwed in and the male screw portion 42a protrudes from the contact surface 41a, the front end surface of the male screw portion 42a hits the receiving surface 31s, and the receiving member 41 floats from the receiving surface 31s. Tension is applied to the metal strip 35 according to the amount of floating. Thereby, the joint 10 and the resin pipe 20 at the time of electric welding can be temporarily fixed more firmly.

  When the thumbscrew 42 is screwed in, the receiving member 41 is prohibited from rotating together. Since the pair of locking plate portions 43b of the rotation preventing member 43 are locked to both side edges of the metal band 35 and locked to both end surfaces 41c of the receiving member 41, the relative of the receiving member 41 to the metal band 35 This is because rotation is prohibited.

The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the invention.
There may be a plurality of, for example, two or three intermediate holding members of the fixing device. In this case, these intermediate holding members are also connected by a flexible connecting member.
In the intermediate holding member, the joint holding portion and the tube holding portion may be integrally formed without being separated. In this case, the number of connecting members may be one.
The connecting member that connects the first holding member and the intermediate member and the connecting member that connects the second holding member and the intermediate member may be separate members.
In the second embodiment, the tension applying structure may be set on the second holding member or the intermediate holding member.

  The present invention can be applied to a fixing device that temporarily fixes an electric fusion joint and a resin pipe.

DESCRIPTION OF SYMBOLS 10 Electric fusion joint 11 Receptacle 12 Heat generating body 13 Terminal part 20 Resin pipe 30 Fixing device 31 1st holding member 32 2nd holding member 33 Intermediate holding member 31a, 32a, 33a Joint holding part 31b, 32b, 33b Pipe holding part 31x Through hole 33x Long hole 34 Screw (connecting means)
35 Metal strip (first connecting member)
35x insertion hole 36 metal band (second connecting member)
37 Fastening tool 40 Tension applying structure 41 Receiving member 41b Hooking surface 41c End surface 41x Screw hole 42 Thumb screw (screw member; displacement means)
42a Male thread part 43 Anti-rotation member 43a Main plate part 43b Locking plate part 43x Insertion hole

Claims (13)

In the fixing device for temporarily fixing the electric fusion joint and the resin pipe so as to surround the electric fusion joint and the resin pipe inserted into the end opening of the electric fusion joint,
The first and second holding members located at both ends in the circumferential direction, at least one intermediate holding member located in the middle in the circumferential direction, the first holding member, the intermediate holding member, and the second holding member in this order. A flexible connecting member that is connected in a state of being separated from each other, and a fastening tool that detachably fastens the first holding member and the second holding member,
The first and second holding members and the intermediate holding member each have a joint holding portion and a tube holding portion that are adjacent in the axial direction, and when the temporary fixing is performed, the joint holding portion serves as the electrofusion joint. An electrofusion fixing device, wherein the tube holding portion is in contact with the outer periphery of the resin tube.   The electrofusion fixing device according to claim 1, wherein the connecting member has a band shape and is fixed to outer surfaces of the first and second holding members and the intermediate holding member.   3. The electrofusion fixing device according to claim 1, wherein the connecting member continues from the first holding member to the second holding member through the intermediate holding member. 4.   The electrofusion fixing device according to any one of claims 1 to 3, wherein a plurality of the connecting members are arranged apart from each other in the axial direction.   The joint holding part and the pipe holding part of the intermediate holding member are separated, and the plurality of connecting members are fixed to the joint holding part of the first and second holding members and the intermediate holding member. 5. The electrofusion fixing device according to claim 4, further comprising: a first connecting member, and a second connecting member fixed to the tube holding portion of the first and second holding members and the intermediate holding member.   6. The electricity according to claim 5, wherein the joint holding portion and the tube holding portion of the intermediate holding member are connected by a connecting means that prohibits relative movement in the axial direction and allows relative movement in the radial direction. Fusion fixing device.   The connecting means has a screw, and the screw is screwed into the joint holding portion of the intermediate holding member through a long hole having a cross section elongated in the radial direction formed in the tube holding portion of the intermediate holding member. The fixing device for electric fusion according to claim 6, wherein the fixing device is used.   Any one of the first and second holding members and the intermediate holding member is formed with a through-hole penetrating in the radial direction, and when temporarily fixed, from the outer periphery of the electrofusion joint 8. A fusion bonding apparatus according to claim 1, wherein a terminal portion projecting in the radial direction enters the through hole.   A tension applying structure is further provided, and the tension applying structure applies tension to the connecting member by pushing the connecting member radially outward of the electrofusion joint and the resin pipe. The electric fusion fixing device according to 1. The connecting member is fixed to the outer surfaces of the first and second holding members and the intermediate holding member;
The tension applying structure includes a receiving member and a displacement means,
The receiving member is disposed between an outer periphery of a holding member selected from the first and second holding members and the intermediate holding member and the connecting member,
10. The electromelting device according to claim 9, wherein the displacing means applies tension to the connecting member hung on the receiving member by floating the receiving member from the outer periphery of the selected holding member. Wear fixing device. The receiving member has a screw hole penetrating in the radial direction of the electric fusion joint and the resin pipe,
The displacement means has a screw member screwed into a screw hole of the receiving member,
11. The electrofusion fixing device according to claim 10, wherein a tip end of the screw member hits an outer periphery of the selected holding member, and the receiving member is floated from an outer periphery of the selected holding member. The receiving member has the same cross-sectional shape along the axial direction of the electric fusion joint and the resin pipe, and has a hooking surface that forms a convex curved surface on the radially outer side of the electric fusion joint and the resin pipe. And
The connecting member has a band shape and is hung on the hanging surface of the receiving member, and has an insertion hole at a position corresponding to the screw hole,
The electrofusion fixing device according to claim 11, wherein the screw member is screwed into the screw hole of the receiving member through the insertion hole of the connecting member. In the state where the receiving member has the same length as the width of the connecting member, and the receiving member is disposed between the selected holding member and the connecting member, both end surfaces of the receiving member are Coincides with both side edges of the connecting member,
The tension applying structure further includes a rotation preventing member, which includes a main plate portion having the same length as the width of the connecting member, and a locking plate portion that is connected to both ends of the main plate portion and forms a right angle with the main plate portion. And an insertion hole is formed in the main plate part,
The main plate portion of the anti-rotation member rides on the hooking surface of the receiving member via the connecting member, and the pair of locking plate portions are locked to both side edges of the connecting member and both end surfaces of the receiving member. 13. The electric welding according to claim 12, wherein the screw member is screwed into the screw hole of the receiving member through the insertion hole of the main plate portion and the insertion hole of the connecting member. Fixing device.

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