JPH1038173A - Connection method for thermoplastic resin piping member, connection device and piping member used in this connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable fitting of piping members with ease and sufficient connection strength by dislocating pipe axes of the piping members having different measurements in inner and outer diameters at a fitting portion, and rotating one piping member in its circumferential direction in the state that the outer peripheral wall of the piping member is in contact with the inner peripheral wall of the other. SOLUTION: A pipe 1 is served as one piping member. The other is a joint 2a which has an inner diameter a little larger than an outer diameter of the end of the pipe 1, a number of projected lines 21 formed on an outer peripheral wall in teeth-like form with equal pitches parallely to an axis of the pipe, a weight 22 fixed to one part of the outer peripheral wall, and a specific gravity dislocated from the pipe axis to the side of the weight 22. The ends of the pipe 1 are fitted to both sides of the joint 2a. A gear 31 on a leading end of a driving shaft 3 is meshed with the projected line 21 of the joint 2a which is then rotated in a circumferential direction around the pipe axis. At the fitted portion, the outer peripheral wall of the pipe 1 and an inner peripheral wall of the joint 2a are softened by frictional heat therebetween and deposited to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining thermoplastic resin piping materials, a joining apparatus used for the joining method, and piping materials.

[0002]

2. Description of the Related Art As a method for joining thermoplastic resin piping members, a method using rotary friction welding (spin welding) as disclosed in Japanese Patent Application Laid-Open No. 51-118116 is known. . In this rotational friction joining method, after fitting a pipe member and a pipe member, and at the fitting portion, contacting the inner wall surface of one of the pipe members with the outer wall surface of the other pipe member,
While maintaining this contact state, one of the pipe members is rotated in the circumferential direction around the pipe axis, and the frictional heat generated between the contacting inner and outer wall surfaces softens the resin on the inner and outer wall surfaces of both pipe members, and fuses them together. It is made to let.

However, in the above-mentioned conventional method, since the outer diameter of the portion of one pipe member to be fitted inside and the inner diameter of the portion of the other pipe member to be fitted substantially coincide with each other over the entire length, In addition to the need for force when mating, the frictional resistance is large at the beginning of rotation, the power of the drive source that rotates the piping material must be very large, which increases the cost and makes it difficult to perform on-site construction. There is a problem that there is.

In addition, a pipe end surface of a pipe material to be internally fitted is chamfered in a tapered shape, and a fitting portion of a pipe material to be externally fitted is formed to have an inner surface shape along the taper to reduce a force required for fitting. For example, in the case of a pipe made of a thermoplastic resin, for example, in the case of a gas pipe, the variation in diameter is specified to be 0.15 to 1.9 mm according to JIS K 6774. It has an ellipticity within the standard range. Therefore, there is inevitably contact unevenness in the circumferential direction, and there is a possibility that a variation in bonding strength occurs in the circumferential direction. In addition, the ellipticity is not constant in the axial direction, and there is variation among products.

Therefore, the conventional method has a problem that the joint strength in the axial direction is not stable. On the other hand, if the outside diameter of the part where one of the pipe members is fitted inside is slightly smaller than the inside diameter of the part where the other piping member is fitted outside, the fitting between the piping member and the piping member can be easily performed. However, there is a problem that the contact pressure between the pipe wall surfaces is small and the frictional heat generation is insufficient, so that sufficient joining strength cannot be obtained.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is capable of easily fitting a pipe member to a pipe member, and does not require a large-scale device, and provides sufficient joint strength. It is an object of the present invention to provide a joining method of a thermoplastic resin piping material to be used, a joining device and a piping material used in the joining method.

[0007]

Means for Solving the Problems In order to achieve such an object, a method of joining thermoplastic resin piping materials according to the invention of claim 1 (hereinafter referred to as "method of claim 1"). Is to fit one of the piping members with the other piping member, and to rotate at least one of the piping members in the circumferential direction, and by this rotation, the inner wall surface of one of the piping members in the joining section and the other of the piping members are rotated. In a joining method of thermoplastic resin piping material in which both piping materials are fusion-bonded by friction-melting with an outer wall surface of the piping material, the outer diameter of an inner fitting portion of one piping material is externally fitted to the other piping material. While making the diameter a little smaller than the inside diameter of the part to be shifted, displacing the pipe axes of both piping materials, at least any one while keeping the inner wall surface of one piping material and the outer wall surface of the other piping material in partial contact And rotate one of the pipes in the circumferential direction. It was.

In the method for joining thermoplastic resin piping materials according to the second aspect of the present invention (hereinafter referred to as “method of the second aspect”), the center of gravity is shifted from the pipe axis in the method of the first aspect. The piping material provided at the position is used for one of the piping materials, and the piping material is rotated in the circumferential direction around the pipe axis.
The method for joining thermoplastic resin piping materials according to the invention of claim 3 (hereinafter referred to as “method of claim 3”) is the method of claim 1, wherein one of the piping materials is provided via an urging means. Was urged in a direction intersecting with the pipe axis so that the inner wall surface of one of the pipe members and the outer wall surface of the other of the pipe members were partially in contact with each other.

A joining apparatus used in the method for joining thermoplastic resin piping materials according to the invention described in claim 4 (hereinafter referred to as “apparatus of claim 4”) surrounds one of the piping materials. And a ring-shaped rotating force applying means for rotating the pipe material about the pipe axis by the rotational driving force given by the driving means, and the pipe of the piping material whose center of gravity of the ring-shaped rotating force applying means is gripped. The structure is provided at a position shifted from the axis.

[0010] A pipe material (hereinafter referred to as "pipe material of claim 5") used in the method of joining thermoplastic resin pipe materials according to the invention of claim 5 is characterized in that one pipe material is replaced by the other pipe material. And at least one of the pipe members is rotated in the circumferential direction, and the rotation frictionally melts the inner wall surface of one of the pipe members and the outer wall surface of the other pipe member in the joint section. A pipe material for use in a method of joining thermoplastic resin pipe materials by fusing and joining the pipe materials, wherein, at the initial stage of fitting, only 1/8 to 1/2 of a set joint area is contacted. The joint surface of the joint section is on the pipe end side,
At the time of fitting, a tapered portion for forming a gap with the other pipe member was provided.

The piping material used in the method for joining thermoplastic resin piping material according to the invention of claim 6 (hereinafter referred to as “pipe material of claim 6”) is the same as the pipe material of claim 5,
At the beginning of the fitting, a partition having a height that does not contact the pipe wall of the other pipe member is provided over the entire circumference from a part of the tapered portion or from the end of the joining section to the pipe end.

In the method according to any one of claims 1 to 3, the apparatus according to claim 4, the piping material according to claim 5 and the piping material according to claim 6, the thermoplastic resin forming the piping material is not particularly limited. Although not limited, for example, polyethylene, polypropylene, and polyvinyl chloride may be used, and a piping material using different resins may be used. However, it is preferable that the joining surfaces of both piping materials have substantially the same melting temperature.

In the method according to any one of claims 1 to 3, the rotation speed of the pipe is not particularly limited, but is preferably 500 to 3600 rpm.
The degree is preferred. Further, the clearance at the fitting portion between one pipe member and the other pipe member is not particularly limited, but is preferably about 0.3 to 0.6 mm.

In the method of the second aspect, the method of shifting the center of gravity is not particularly limited, and includes, for example, a method in which a weight is fixed to a part of the outer wall surface of the pipe member. When the weight is fixed, there is no particular limitation as long as the centrifugal force that can obtain a sufficient joining pressure at the joint surface can be applied within a range in which the centrifugal force of the weight does not deform the pipe material, When the diameter is 50 to 200 mm, the weight is preferably 2 to 200 g.

In the method of the third aspect, the urging means is not particularly limited, but includes, for example, a pressure device such as a spring or an air cylinder. In the pipe member according to claim 5 or 6, the inclination angle of the tapered portion is not particularly limited, but is preferably about 0.5 to 3.0 °.

The rotation speed is not particularly limited.
It is preferably about 500-3600 rpm. In the pipe member according to the sixth aspect, it is preferable that the height of the partition is as high as possible without contacting the inner wall surface of the other pipe member.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. 1 to 3 show an embodiment of the method of the first and second aspects.

As shown in FIGS. 2 and 3, in this method, first, the pipe 1, 1 as one of the pipe members and the inner diameter is slightly larger than the outer diameter of the pipe end of the pipe 1, 1. ., 21 are provided on the outer wall surface at an equal pitch in a gear shape in parallel with the tube axis, and the weight 22 is fixed to a part of the outer wall surface, and the center of gravity is Weight from shaft 2
A double socket type joint 2a is prepared as the other pipe member provided at a position shifted to the side 2 and a pipe 1 and a pipe 1 are attached to the joint 2a.
1 are fitted from both sides as shown in FIGS.

As shown in FIGS. 1 and 2, a gear 31 provided at the tip of a drive shaft 3 connected to a drive motor (not shown) is engaged with a ridge 21 of a joint 2a.
The joint 2a is rotated in the circumferential direction around the tube axis by the rotational driving force of the drive motor, so that the pipe 1
The outer wall surface of the tube 1 and the inner wall surface of the joint 2a are softened and fused by the heat of friction between the outer wall surface of the tube 1 and the inner wall surface of the joint 2a.

That is, according to this method, since the inner diameter of the joint 2a is slightly larger than the outer diameter of the tube 1, the fitting can be performed smoothly, and a large frictional resistance is not applied when the rotary drive is applied. The joint 2a can be rotated by the driving force. Further, once the joint 2a starts rotating, as shown in FIGS. 2 and 3, the center of gravity of the joint 2a is displaced from the tube axis, so that the tube shaft 28 of the joint 2a is eccentric from the tube axis 18 of the tube 1. In a state where the inner wall surface of the joint 2a and the outer wall surface of the pipe 1 are always in partial contact with a predetermined contact pressure, the joint 2a
Rotates.

Then, as the rotation proceeds, FIG.
As shown in (1), the inner surface of the tube starts to melt uniformly due to the heat generated at the contact portion. Since the joint 2a is rotated eccentrically by the action of the weight 22, the molten resin 8 is compressed at the minimum clearance, and flows to the portion where the clearance is large due to the pressure difference as shown in FIG. 4B. Moreover, the pressure of the molten resin between the pipe 1 and the joint 2a increases due to the expansion of the resin due to heat generation, and finally the pressure of the molten resin becomes higher than the centrifugal force of the weight 22, as shown in FIG. , Joint 2a
Is a constant axis of rotation. As described above, when the rotation of the joint 2a is a rotation of a fixed axis, the pressure of the molten resin between the pipe 1 and the joint 2a becomes constant, and a stable bonding strength in the circumferential direction is obtained.

Therefore, even if the pipe 1 or the joint 2a is elliptical, it is possible to perform firm fusion bonding. Also, even if there is a variation in the amount of ellipse in the longitudinal direction, and even if there is a part that does not contact at all, the molten resin melted in the other part flows into the clearance, so the clearance gradually increases due to the flowing molten resin. It is buried and eventually comes into full contact and becomes evenly fused.

FIG. 5 shows another embodiment of the method of claim 1 and an embodiment of the apparatus of claim 4. As shown in FIG. 5, this method uses pipes 1, 1 as piping materials.
Then, a double socket type joint 2b having an inner diameter slightly larger than the outer diameter of the tube ends of the tubes 1 and 1 and the joining device 4 are prepared.

The joining device 4 includes a ring-shaped rotating force applying means 41, a drive motor (not shown), and a gear 43 provided at the tip of a drive shaft 42 connected to the drive motor. Rotating force applying means 41 is divided into two divided bodies 4
1a, 41a, and these two divided bodies 41a, 41a
a is closed so as to surround the joint 2b.
b can be grasped firmly,
The outer peripheral surface has a ridge 41b that meshes with the gear 43, and a weight 41c for shifting the center of gravity from the center axis of the ring.

That is, according to this method, the joining device 4
In a state where the joint 2b is gripped by the ring-shaped rotating force applying means 41, the pipe ends of the pipes 1 and 1 are fitted to the joint 2b from both sides,
When the drive motor is driven to rotate the ring torque applying means 41, the joint 2b also rotates in the circumferential direction around the pipe axis with the rotation of the ring-shaped torque applying means 41. Moreover, since the center of gravity of the ring-shaped rotating force applying means 41 is provided at a position shifted from the center of the ring, that is, from the pipe axis of the joint 2b, the pipe axis of the joint 2b is set similarly to the method shown in FIGS. The joint 2b rotates in a state where the outer wall surfaces of the tubes 1 and 1 and the inner wall surface of the joint 2b are always partially in contact with a predetermined contact pressure while being displaced from the tube axes of the tubes 1 and 1, and the joint 2b is fused and joined. be able to.

Further, if the above-described joining device 4 is used, the method of claim 1 can be applied to an ordinary short pipe joint having no projection 21 at all like the above-mentioned joint 2b.

FIG. 6 shows another embodiment of the method of the first aspect. In this method, as shown in FIG. 6, the pipes 1, 1 as one of the pipe members, and the inner diameter is slightly larger than the outer diameter of the pipe ends of the pipes 1, 1, and a large number of protrusions 21, 22 are provided.
The two socket-type joints 2c as the other pipe material are provided on the outer wall surface at the same pitch in a gear shape in parallel with the pipe axis. The ends are fitted from both sides.

Next, the gear 31 provided at the tip of the drive shaft 3 is engaged with the ridge 21 of the joint 2c, and the pulley 32 of the drive shaft 3 and the eccentric pulley 51 provided on the rotation shaft of the drive motor 5 are connected. They are connected by a belt 52. Then, the drive motor 5 is driven to rotate, and the rotational force is applied to the eccentric pulley 5.
1, to the drive shaft 3 via the belt 52 and the pulley 32,
The rotation of the drive shaft 3 causes the joint 2c to rotate in the circumferential direction around the pipe axis, and the frictional heat between the outer wall surface of the pipe 1 and the inner wall surface of the joint 2c causes the outer wall surface of the pipe 1 The inner wall surface of the joint 2c is softened and fused.

That is, according to this method, the transmission of the rotational driving force from the driving motor 5 to the driving shaft 3 is performed by the eccentric pulley 5.
1, the belt 52, and the pulley 32, the rotation of the eccentric pulley 51 applies a force to the drive shaft 3 to advance and retreat in the direction of the joint 2c, and this force acts on the joint 2c via the gear 31. In a state where the joint 2c has its pipe axis deviated from the pipe axes of the pipes 1 and 1, the outer wall surface of the joint 2c rotates while partially contacting the inner wall face of the pipe 1, which is similar to the above method. Can be fused.

FIG. 7 shows an embodiment of the method according to the first and third aspects. As shown in FIG. 7, in this method, the drive of the drive motor 5 does not use the eccentric pulley 51,
The pipes 1, 1 are transmitted directly to the drive shaft 3, and
6 in the same manner as in the method of FIG. 6 except that the tube 1 is always urged in a direction perpendicular to the tube axis, and the outer wall surfaces of the tubes 1 and 1 in the urging direction contact the inner wall surface of the joint 2c which is partially rotated. It has become.

FIG. 8 shows an embodiment of the piping material according to the fifth aspect. As shown in FIG. 8, this piping material is a double socket type joint 2d having fitting portions 23, 23 on both sides, and the fitting portion 23 has the outer diameter of the pipe 1 fitted on the back side. An equal-diameter portion 23a having substantially the same inner diameter and a tapered portion 23b gradually increasing in diameter from the equal-diameter portion 23a toward the pipe end, and the entire fitting portion is a joining section. In addition, the area of the equal diameter portion 23a is １ ／ to 〜 of the set bonding area.

As shown in FIG. 8, this joint 2d has pipes 1 and 1 fitted on both sides of the joint 2d, and although not shown, the weight is not provided to the rotational force applying means and the center of gravity is the pipe. Except for being aligned with the axis, the same apparatus as the bonding apparatus of FIG. 4 is used to rotate and to be fusion-bonded to the tubes 1 and 1. That is, this joint 2
According to the joining method using d, the tapered portion 23b
Is provided, and since the length of the equal-diameter portion 23a is short, the pipes 1 and 1 can be easily fitted to the fitting portion 23. In addition, the contact area when applying a rotational force is also 1 / the set joint area.
Since it is 8 to 1/2, it can be rotated with a smaller torque as compared with the case where the entire joining section is brought into contact as in the conventional case.

Then, by this rotation, first, the equal diameter portion 2
The surface of the tube 3a and the inner wall surface of the tube 1 that is in contact with the equal-diameter portion 23a are melted by frictional heat.
Since the tapered portion 23b is provided on the pipe end side of the equal diameter portion 23a, the molten resin flows into the gap 25 formed between the tapered portion 23b and the inner wall surface of the pipe 1. Therefore, the gap 25 is gradually filled, and the entire fitting portion, which is a joining section, is fused and joined.

FIG. 9 shows another embodiment of the pipe member according to the fifth aspect. As shown in FIG.
The nipple-type joint 2e has an equal-diameter portion 24a having an outer diameter equal to the inner diameter of the tube 1, and tapered portions 24b on both sides of the equal-diameter portion 24a that gradually decrease in diameter. Moreover, the area of the equal diameter portion 24a is １ ／ to 1 of the set bonding area.
/ 2.

The joint 2e is not shown, but the pipes 1, 1 as the other pipe material are fitted from both sides similarly to the joint 2d in FIG. 8, and the pipe 1 is rotated by a joining device. As in the case of the joint 2d shown in FIG.

FIG. 10 shows an embodiment of the piping material according to claim 6. As shown in FIG.
8 is the same as the joint 2d of FIG. 8 except that a ridge 26 is provided over the entire inner peripheral surface as a partition near the end on the pipe end side of the tapered portion 23b. Thus, fusion bonding is performed in the same manner.

That is, according to the joint 2f, it is possible to prevent the molten resin flowing out to the pipe end side from leaking from the joining section by the ridges 26, so that the fusion joining can be performed more reliably. it can.

FIG. 11 shows another embodiment of the piping material according to the sixth aspect. As shown in FIG. 11, this pipe material is a double socket type joint 2 g, which has an inverse taper with the tapered portion 23 b from the pipe end side end to the pipe end of the tapered portion 23 b instead of the ridge 26. It is the same as the piping material of FIG. 10 except that the inverted tapered portion 27 is provided.

[0039]

Embodiments of the present invention will be described below in more detail. (Example 1) In the method of FIGS.
８３83.0 mm polyethylene tube 1 and inner diameter 82.9
And a joint 2a made of polyethylene having a weight of about 83.3 mm and provided with two weights of 300 g on the outer wall surface.
The tube 1 and the joint 2a were fusion-bonded by rotating at a rotation speed of rpm for 15 seconds.

Comparative Example 1 A pipe and a joint were fusion-bonded in the same manner as in Example 1 except that a joint having no weight was used.

The joints obtained by fusion bonding in Example 1 and Comparative Example 1 were examined for the joining shear stress in the circumferential direction of the pipe every 60 °, and the results are shown in Table 1. In Table 1, part A is 0-5.
9 °, B section is 60 to 119 °, C section is 120 to 179
°, D part 180-239 °, E part 240-299
° and F portions represent portions of 300 to 359 °, respectively.

[0042]

[Table 1]

From Table 1 above, it can be clearly seen that the method of the present invention enables uniform and firm joining in the circumferential direction.

(Example 2) Using a joint 2f made of polyethylene and a pipe 1 shown in FIG.
After rotating at a rotation speed of rpm for 20 seconds and cooling for 30 seconds, the joint 2f and the tube 1 were fusion-bonded.

[Dimensions of Each Part] Outer diameter of pipe 1: 82.8 mm ± 0.3 mm Minimum inner diameter of joint 2f: 82.7 mm Maximum inner diameter of joint 2f: 83.4 mm Angle of taper 23b: 1 °・ Height of the ridge 26: 0.1mm ・ Length of the joint 23: 30mm ・ Length of the joint 2f: 40mm

(Comparative Example 2) A joint and a pipe were fusion-bonded in the same manner as in Example 2 except that a taper portion was not provided at all and a joint having only an equal diameter portion was provided up to the pipe end. . Table 2 shows the results of examining the shear stress in the tube axis direction at the joint surface of the fusion-bonded portion in Example 2 and Comparative Example 2.

[0047]

[Table 2]

From Table 2, if the joint 2f of the second embodiment is used,
It can be clearly understood that the joint can be uniformly formed in the pipe axis direction as compared with the case where the conventional joint is used. Further, the rotational torque required for rotating the joint until the fusion bonding of Example 2 and Comparative Example 2 was performed was measured, and the results are shown in FIG.

As shown in FIG. 13, it can be seen that the fusion bonding using the joint of Example 2 can be performed with about half the torque as compared with the fusion bonding using the conventional joint.

[0050]

As described above, according to the first to third aspects of the present invention, the pipe members can be easily fitted to each other, and a large-scale apparatus is not required. High bonding strength can be obtained. Further, according to the apparatus of the fourth aspect, the method of the first aspect can be easily implemented using existing piping materials.

According to the pipe member of the fifth and sixth aspects, even if the conventional joining method and the conventional joining apparatus are used, the fitting between the pipe member and the piping member is easy and a large-scale apparatus is required. And sufficient bonding strength can be obtained. According to the piping material of the sixth aspect, a more uniform and reliable joining state can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the method of claim 1 and claim 2;

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG. 1;

FIG. 4 is an explanatory diagram schematically illustrating a flow of a molten resin.

FIG. 5 is a partially cutaway perspective view showing an embodiment of the method of claim 1 and the apparatus of claim 4;

FIG. 6 is an explanatory view schematically showing another embodiment of the method of claim 1;

FIG. 7 is an explanatory view schematically showing another embodiment of the method of claim 1 and claim 3.

FIG. 8 is a half sectional view showing an embodiment of the piping material of claim 5;

FIG. 9 is a half sectional view showing another embodiment of the piping material of claim 5;

FIG. 10 is a half sectional view showing an embodiment of the piping material of claim 6;

FIG. 11 is a half sectional view showing another embodiment of the piping material of claim 6;

FIG. 12 is a dimensional view of a pipe and a joint used in Example 2.

FIG. 13 is a graph showing the relationship between the rotation time and the required power in the method of Example 2 and the method of Comparative Example 2;

[Explanation of symbols]

 Reference Signs List 1 pipe (piping material) 2a fitting (piping material) 2b fitting (piping material) 2c fitting (piping material) 2d fitting (piping material) 2e fitting (piping material) 2f fitting (piping material) 2g fitting (piping material) 26 protrusion Strip (partition) 27 Reverse taper part (partition) 3 Drive shaft 41 Ring-shaped rotating force applying means 6 Spring (biasing means)

Claims (6)

[Claims] 1. A pipe member is fitted with the other pipe member, and at least one of the pipe members is rotated in a circumferential direction of the pipe member. In a joining method of thermoplastic resin piping material in which the outer wall surface of the other piping material is friction-fused with the outer wall surface of the other piping material and the two piping materials are fusion-bonded, the outer diameter of a portion where one of the piping materials is internally fitted is adjusted to the other piping material. In addition to making the diameter slightly smaller than the inner diameter of the part to be externally fitted, the pipe axes of both piping materials are shifted, and the inner wall surface of one piping material is kept in partial contact with the outer wall surface of the other piping material. A method of joining thermoplastic resin piping material, characterized in that at least one of the piping materials is rotated in the circumferential direction. 2. The thermoplastic resin according to claim 1, wherein a pipe member whose center of gravity is displaced from the tube axis is used for one of the pipe members, and the pipe member is rotated in the circumferential direction around the tube axis. How to join piping materials. 3. A pipe member is urged through an urging means in a direction intersecting the pipe axis so that an inner wall surface of one pipe member and an outer wall surface of the other pipe member partially contact each other. The method for joining thermoplastic resin pipe materials according to claim 1, wherein 4. A ring-shaped rotating force applying means which grips one of the pipe members so as to surround the pipe member and rotates the pipe member around a pipe axis by a rotational driving force provided by a driving means. The joining device used in the method for joining thermoplastic resin piping materials according to claim 1, wherein the center of gravity of the rotational force applying means is provided at a position shifted from the pipe axis of the piping material to be gripped. 5. One pipe member is fitted with the other pipe member, and at least one of the pipe members is rotated in the circumferential direction, and the rotation causes the inner wall surface of one of the pipe members in the joint section to rotate. A pipe material used for a method of joining thermoplastic resin pipe materials by friction-melting the outer wall surface of the other pipe material and fusing and joining the two pipe materials, and having a set joint area of 1 at the initial stage of fitting. The joining surface of the joining section is provided with a tapered portion which forms a gap with the other piping material at the time of fitting so that only / 8 or more and 以下 or less contact with each other. Piping material used in the method of joining thermoplastic resin piping materials. 6. A partition having a height that does not come into contact with the pipe wall of the other pipe material at the time of fitting at a part of the tapered portion or from the end of the joining section to the pipe end. A pipe material for use in the method for joining thermoplastic resin pipe materials according to 1 above. .