JP4742319B2 - Tubular member joining structure and joining method thereof - Google Patents

Description

  The present invention relates to a joining structure of tubular members used for a three-dimensional structure and a joining method thereof.

  In large structures applied to installation environments such as radio telescopes, resin materials such as CFRP (Carbon Fiber Reinforced) are lightweight, rigid, and have a low linear expansion coefficient in order to meet demands for high reliability, light weight, low thermal deformation, and the like. A three-dimensional truss or pole structure using a plastics tube or the like is used. These materials are assembled by bonding the pipe members or the pipe member and the joint by bonding.

  For example, in JP-A-2005-256349, FIG. 2 (see Patent Document 1), an adhesive filling space 8 is provided at the joint between the first tubular member 1 and the second tubular member 2, and the second tubular member is formed. A porous member 7 having elasticity is sandwiched between the insertion end of the member 2 and the engaging portion 4 provided on the inner diameter side of the first tubular member 1, and the end portion of the first tubular member 1 and the second portion The gap between the tubular member 2 and the outer peripheral surface of the tubular member 2 is sealed with a sealing material 9, and an adhesive is injected from an adhesive injection port 6 communicating with the adhesive filling space 8, and air in the adhesive filling space 8 is blown into the porous member 7. Are disclosed in which both tubular members are joined together and devised by the patent applicant.

Japanese Patent Laying-Open No. 2005-256349 (FIG. 2)

  However, as described in paragraph “0010” of Patent Document 1, when a metal such as Invar (iron nickel alloy) is used as a pipe joint, a resin pipe such as CFRP is inserted into the inner peripheral surface of the metal pipe. However, the outer peripheral surface of the CFRP has a corrugated surface (undulation) that occurs during molding, unlike the inner peripheral surface installed on the core metal (axial center). It was necessary to add a step of polishing by machining to make the outer peripheral surface uniform.

  Also, when using tubular pipes for large radio telescopes, etc., use pipes with different pipe shapes for the multiple pipe parts that support the parabolic antenna and the stays that support the secondary mirror installed above the parabolic antenna. When CFRP is used as the stay, it is preferable that the outer periphery and the thickness of the CFRP are large. In the structure in which the CFRP is inserted into the inner periphery of the invar joint, it is necessary to prepare a plurality of types of invar joints.

  This invention has been made to solve the above-mentioned problems, eliminates the need for polishing of the outer peripheral surface of the CFRP by machining, standardizes the type of metal pipe used as a joint, and processes the adhesive filling space. It aims at obtaining the joining structure of the tubular member which is provided in the metal pipe side which is easy, and does not protrude the adhesive agent, and its joining method.

Junction structure of the tubular member according to claim 1, fitted with the first tubular member and the second tubular member, the joint structure of the tubular member to be joined with an adhesive, a resin molded pull at the core metal A first tubular member having a uniform inner peripheral surface extracted, a second tubular member made of metal having an outer periphery larger than the inner periphery of the first tubular member, and an end portion of the second tubular member along the tube axis The outer peripheral surface is cut out over a predetermined length, and the movement in the tube axis direction provided at the insertion end side of the second tubular member in the fitting region between the first tubular member and the second tubular member is locked. A recessed portion that forms an adhesive filling space that is in contact with the inner peripheral surface of the first tubular member that is partially provided by cutting out the outer peripheral surface of the second tubular member in the fitting region; A plurality of adhesive members which are adhered to the tube shaft side end of the tubular member and have resilience that is larger than the inner periphery of the first tubular member. And a hole provided in the fitting region of the first tubular member corresponding to the adhesive filling space, and an adhesive filled in the adhesive filling space, the first tubular member being In addition to fixing at the locking portion, the inner peripheral surface of the first tubular member and the outer peripheral surface of the porous member in the tube axis direction are pressure-bonded.

The tubular member joining structure according to claim 2 is a resin-molded tubular member joining structure in which a plurality of tubular members and a joint-like tubular member are fitted together and joined using an adhesive . A first tubular member having a uniformly drawn inner peripheral surface, a second tubular member made of a metal having a larger outer periphery than the inner periphery of the first tubular member, and one end of the second tubular member The first insertion end of the second tubular member is a first fitting region between the first tubular member and the second tubular member by cutting out the outer peripheral surface over a predetermined length along the tube axis from the end on the side. A first locking portion for locking the movement in the tube axis direction provided on the side, and a first tubular member partially provided by cutting out the outer peripheral surface on one end side of the second tubular member in the first fitting region. A first recess portion forming a first adhesive filling space in contact with the inner peripheral surface, and the one end side on the tube axis side of the second tubular member. A first porous member that is adhered to the end and has resilience larger than the inner circumference of the first tubular member, and the first fitting region of the first tubular member corresponding to the first adhesive filling space a first hole portion provided in said the adhesive filled in the first adhesive filling space, outer peripheral inner circumference greater than the first tubular member is formed of resin equal to the first tubular member, a core metal A third tubular member having a uniform inner peripheral surface extracted by the third tubular member, and a third tubular member by cutting out the outer peripheral surface over a predetermined length along the tube axis from the other end of the second tubular member. A second engagement region that is a second fitting region between the member and the second tubular member and that is provided on the second insertion end side of the second tubular member and engages in movement in the tube axis direction; and the second fitting region A second adhesive filling space that is in contact with the inner peripheral surface of the third tubular member that is partially provided by cutting out the outer peripheral surface of the other end of the second tubular member is formed. And a second porous member which is adhered to the end of the second tubular member on the tube axis side of the second tubular member and has resiliency larger than the inner periphery of the third tubular member, A second hole provided in the second fitting region of the third tubular member corresponding to the second adhesive filling space; and an adhesive filled in the second adhesive filling space; The tubular member is fixed by the first locking portion, the inner peripheral surface of the first tubular member and the outer peripheral surface of the first porous member in the tube axis direction are pressure-bonded, and the third tubular member is fixed to the second locking portion. And the inner peripheral surface of the third tubular member and the outer peripheral surface of the second porous member in the tube axis direction are pressure-bonded.

Method for joining tubular member according to claim 3, fitted in the first tubular member and the second tubular member, the method for joining tubular members to be joined using an adhesive, a resin molded pull at the core metal The outer periphery to be inserted into the first tubular member having the extracted uniform inner peripheral surface extends from the end of the second tubular member made of a metal larger than the inner periphery of the first tubular member over a predetermined length along the tube axis. A cutting step in which an outer peripheral surface is cut out to provide a fitting region between the first tubular member and the second tubular member and to provide a locking portion for locking movement in the tube axis direction on the insertion end side of the second tubular member; A grinding step of providing a recess for forming an adhesive filling space that is partially in contact with the inner peripheral surface of the first tubular member by cutting out the outer peripheral surface of the second tubular member in the fitting region; A porous member having resilience larger than the circumference and similar to the end of the second tubular member on the tube axis side An attaching step for adhering to the adhesive, a drilling step for providing a hole in the fitting region of the first tubular member corresponding to the adhesive filling space, a first tubular member and a second tubular member, and the locking portion. An insertion step of fixing the inner peripheral surface of the first tubular member and the outer peripheral surface of the porous member in the tube axis direction , and an end portion of the first tubular member and the engaging portion of the second tubular member A sealing step for sealing the gap between the first tubular member and the adhesive filling space from the hole of the first tubular member, and discharging the air in the adhesive filling space from the porous member An adhesive injection step of filling the adhesive and joining the first tubular member and the second tubular member.

Method for joining tubular member according to claim 4, fitted with a plurality of tubular members and joint tubular member, the method for joining tubular members to be joined using an adhesive, a resin molded at core metal The outer periphery to be inserted into the first tubular member having a drawn uniform inner peripheral surface is made of a metal larger than the inner periphery of the first tubular member, and the tube shaft extends from the end on the one end side of the second tubular member opened at both ends. A first fitting region between the first tubular member and the second tubular member is provided by cutting out the outer circumferential surface over a predetermined length along the tube and moving in the tube axis direction toward the first insertion terminal side of the second tubular member A first cutting step for providing a first locking portion for locking the inner periphery of the first tubular member provided by partially cutting the outer peripheral surface of one end side of the second tubular member in the first fitting region. A first grinding step of providing a first recess for forming a first adhesive filling space in contact with the surface; An adhering step of adhering a first porous member having resilience larger than the inner circumference of the material to the end of the second tubular member on the tube axis side, and the first adhesive filling space A first drilling step of providing a hole in the first fitting region of the corresponding first tubular member; fixing the first tubular member and the second tubular member at the first locking portion; and the first tubular member A first insertion step of crimping the inner peripheral surface of the first porous member and the outer peripheral surface of the first porous member in the tube axis direction , and a gap between the end of the first tubular member and the first locking portion of the second tubular member Sealing with a sealing material, and an adhesive is injected into the first adhesive filling space from the hole of the first tubular member, and from the first porous member into the first adhesive filling space. Bonding the first tubular member and one end of the second tubular member by filling the adhesive while discharging air An injection step, the outer periphery the inner periphery greater than the first tubular member is formed of resin equal to the first tubular member, second to insert the third tubular member having a uniform inner peripheral surface which is withdrawn at the core metal An outer peripheral surface is cut out over a predetermined length along the tube axis from the other end of the tubular member to provide a second fitting region between the third tubular member and the second tubular member, and the second tubular member A second cutting step of providing a second locking portion for locking the movement in the tube axis direction on the second insertion terminal side, and cutting out the outer peripheral surface of the other end side of the second tubular member in the second fitting region A second grinding step of providing a second recess for forming a second adhesive filling space in contact with the inner peripheral surface of the partially provided third tubular member, and resilience greater than the inner periphery of the third tubular member A second affixing step of adhering the second porous member having the property to the end portion on the other end side on the tube axis side of the second tubular member; A second drilling step in which a hole is provided in the second fitting region of the third tubular member corresponding to the second adhesive filling space; and the second locking member includes the third tubular member and the second tubular member. And the second insertion step of crimping the inner peripheral surface of the third tubular member and the outer peripheral surface of the second porous member in the tube axis direction , and the end of the third tubular member and the second tubular member A second sealing step of sealing a gap with the second locking portion with a sealing material; and an adhesive is injected into the second adhesive filling space from the hole of the third tubular member, and the second porous member. And a second adhesive injection step of joining the third tubular member and the other end of the second tubular member by filling the adhesive while discharging the air in the second adhesive filling space. .

According to the joining structure and joining method for tubular members according to the present invention, the first member is made of a metal that is resin-molded and inserted into the inner peripheral surface of the first tubular member having a uniform inner peripheral surface that is pulled out by a cored bar . Since the latching part which latches the movement of the axial direction made larger than the inner periphery of the 1st tubular member is provided in the outer peripheral surface of 2 tubular members, and the 2nd tubular member is inserted in the inner peripheral surface of the 1st tubular member, the 1st Since the fitting is performed accurately even if there is a corrugated surface on the outer periphery of the tubular member, it is not necessary to polish the outer peripheral surface of the first tubular member, the reliability of the strength of the fitting portion is increased, and the manufacturing man-hours and production are increased. The tubular member can be joined at a low cost, and a flexible porous member larger than the inner periphery of the first tubular member is attached to the end of the second tubular member on the tube axis side, so the first tubular member the inner peripheral surface and a porous outer peripheral surface of the tube axis direction of the member and is crimped in the first tubular member Scattering and protrusion of the adhesive from the peripheral wall surface can be prevented.

  Further, since the second tubular member can be shared even if the outer periphery of the first tubular member is enlarged, it becomes easy to increase the strength by increasing the outer periphery of the first tubular member for a structure that requires strength. It is possible to incorporate a tubular joining member that ensures appropriate strength and weight according to the type of structure.

Embodiment 1 FIG.
1 is a cross-sectional view showing a state before joining in a joining method for tubular members according to Embodiment 1 of the present invention. In FIG. 1, 1 is a circular or square pipe (first tubular member) having an inner circumference (A) of about 90 mm and an outer circumference (B) of about 100 mm formed by resin synthetic fibers such as CFRP, and 2 is an invar. (C) is a metal pipe (second tubular member) with an inner circumference (C) of about 70 mm, and both tubular members are fitted on the inner circumferential surface by inserting it into the end of the first tubular member. Is done. 2a is a recess having a notch for fitting the outer peripheral surface in the vicinity of the insertion end of the second tubular member 2 with the inner peripheral surface of the first tubular member, and further providing a shallow notch region on the central axis side. Is an engaging portion of the second tubular member that is engaged with the end portion of the first tubular member 1, and 3 is an end of the second tubular member having a similar bonding material having an outer periphery slightly larger than the inner periphery of the first tubular member 1. A sponge-like elastic porous member affixed to the part 4 is a through hole (hole part) provided near the end of the first tubular member.

  FIG. 2 is a sectional view showing a joined state of the tubular member according to the first embodiment of the present invention. In FIG. 2, 5 is located between the end portions of the second tubular member 2 and the locking portion 2 b in which a sealed space is formed on the inner peripheral surface of the recessed portion 2 a of the second tubular member 2 and the first tubular member 1. It is an adhesive filling portion (adhesive filling space) having a depth of about 0.2 to 0.5 mm. The porous member 3 attached to the second tubular member 2 has a structure that is crushed by the inner peripheral surface of the first tubular member 1 and prevents bleeding or liquid leakage due to scattering or protrusion of the adhesive. 1 and 2, the same reference numerals indicate the same or corresponding parts.

  FIG. 3 is a cross-sectional view showing the final structure after joining the tubular members according to Embodiment 1 of the present invention. In FIG. 3, 6 is a seal made of an epoxy material or the like for bonding the end portion of the first tubular member and the locking portion 2 b, and 7 is filled in the adhesive filling portion 5 from the through hole (adhesive inlet) 4. It is an adhesive. 1 and 2 indicate the same or corresponding parts.

  Next, the joining method and joining order of the tubular members will be described with reference to FIGS. First, in the cutting step, as shown in FIG. 1, the outer circumference inserted into the first tubular member 1 is a predetermined length along the tube axis from the end of the second tubular member 2 that is larger than the inner circumference of the first tubular member 1. The outer peripheral surface is cut out to set a fitting region between the first tubular member 1 and the second tubular member 2, and the movement in the tube axis direction is locked to the insertion end side of the second tubular member 2. A stepped locking portion 2b is provided.

  Next, in the grinding process, the outer peripheral surface of the second tubular member 2 in the fitting region is cut out thinly by about 0.2 mm to 0.5 mm to form a partial recess, and the inner periphery of the first tubular member 1 is formed. A recess 2a that forms an adhesive filling space 5 by contacting the surface is provided.

  Next, in the attaching step, a sponge-like porous member 3 larger than the inner periphery of the first tubular member 1 is attached to the end of the second tubular member 2 on the tube axis side with an adhesive such as an adhesive or adhesive tape. wear.

  Next, a through hole 4 is provided in the fitting region of the first tubular member 1 corresponding to the adhesive filling space 5 in a drilling process.

Next, in the insertion step, the first tubular member 1 and the second tubular member 2 are fixed by the engaging portion 2b, and the inner peripheral surface of the first tubular member 1 and the outer peripheral surface of the porous member 3 in the tube axis direction are fixed. Crimp. That is, when the first tubular member 1 is relatively moved and pressed in the direction of the tube axis of the second tubular member 2, the outer peripheral tip of the porous member 3 becomes the first tubular member 1 as shown in FIG. The second tubular member 2 passes through the end of the second tubular member 2 while being crushed by the inner peripheral surface of the second tubular member 2 and is locked by the locking portion 2 b of the second tubular member 2. Along with being locked by the locking portion 2 b, the adhesive filling portion 5 is formed between the recessed portion 2 a provided in the second tubular member 2 and the inner peripheral surface of the first tubular member 1.

  Next, in the sealing step, a minute gap between the end portion of the first tubular member 1 and the engaging portion 2b of the second tubular member 2 is sealed with a sealing material 6 as shown in FIG.

  Next, in the adhesive injection step, the adhesive 7 is injected into the adhesive filling space communicating from the hole 4 of the first tubular member 1 serving as the adhesive injection port, and the air in the adhesive filling space is passed from the porous member 3. The first tubular member 1 and the second tubular member 2 are joined by filling the adhesive 7 while discharging.

  From the above, in the first embodiment, even if the CFRP pipe has an undulating surface such as a corrugated surface on the outer periphery, the fitting surface of the CFRP pipe is the inner peripheral surface. It can be easily inserted. That is, it is not necessary to polish the first outer peripheral surface, the reliability of the strength of the fitting portion is increased, and it is possible to join a high-quality tubular member with reduced manufacturing steps and low manufacturing costs.

  Further, by the adhesive injection operation, the air inside the adhesive filling portion 5 is pushed by the adhesive 7 and diffuses through the joined gap between the first tubular member 1 and the second tubular member 2, but the adhesive 7 is bonded. While the entire surface of the agent filling portion 5 is filled so as to be substantially uniform, the adhesive 7 reaching the porous member 3 is absorbed and held in relatively large bubbles of the continuous porous member 3 to form a tubular shape. Prevents drooping inside the member.

Embodiment 2. FIG.
FIG. 4 is an external view for explaining a joint structure when one of the tubular members according to Embodiment 2 of the present invention is a joint. In FIG. 4, 8 is a holder installed by being wound around a metal binder or the like, 8a is a hole for fixing the holder 8, 10 is a resin molded pipe such as CFRP, 20 is a metal joint composed of invar, The metal joint 20 is one in which at least both ends of the second tubular member 2 described with reference to FIGS. 3 denote the same or corresponding parts.

  Next, a method for joining the tubular member and the metal joint will be described. FIG. 5 is an external view of a radio telescope installed on a mountain top or the like. FIG. 5A is an external view of a radio telescope reflector that schematically represents the parabolic surface upper structure. From the parabolic surface of the parabolic antenna, the stay, the support structure, the submirror installed on the upper portion of the parabolic surface, and the like. Become. FIG. 5B is a schematic diagram of a tubular member and a metal joint connected to a stay on the parabola surface, and FIG. 5C is a schematic diagram of a tubular member and a metal joint used for a support structure that supports the parabola surface. The figure is shown. As shown in FIG. 5, the structure supporting the stay may increase the strength due to the influence of the secondary mirror and the weight of the stay, the earthquake, and the wind load with respect to the many support structures that support the parabolic surface. . On the other hand, as shown in FIG. 6, since the metal joint 20 is inserted into the inner peripheral surface of the CFRP pipe 10, the CFRP pipe 10 is thicker and has a larger outer periphery (D) than the outer periphery (B) shown in FIG. Even in the case of using the metal joint 20, the metal joint 20 used for the support structure can be used in common. In FIG. 6, the same reference numerals as those in FIG. 4 denote the same or corresponding parts.

  From the above, since the second tubular member such as a metal joint made of invar or the like can be shared even if the outer periphery of the first tubular member such as a CFRP pipe is enlarged, the first tubular member is used for a structure requiring strength. Increasing the strength of the member by increasing the outer circumference and thickness of the member enables incorporation into a structure in which tubular members having various strengths are joined.

It is sectional drawing which shows the state before joining of the joining structure of the tubular member by Embodiment 1 of this invention. It is sectional drawing which shows the joining state of the joining structure of the tubular member by Embodiment 1 of this invention. It is a final sectional view of the joining structure of the tubular member by Embodiment 1 of this invention. It is an external view of the tubular member containing the metal coupling by Embodiment 2 of this invention. It is a model external view of a radio telescope reflector part. It is sectional drawing which shows the joining state of the joining structure of the tubular member by Embodiment 2 of this invention.

Explanation of symbols

1. First tubular member (resin pipe) 2. Second tubular member (metal pipe)
2a ··· depression 2b · · locking portion 3 · · porous member (sponge) 4 · · hole (through hole)
5. ・ Adhesive filling part (adhesive filling space) 6. ・ Seal material 7. ・ Adhesive 8 ・ ・ Holder 8a ・ ・ Hole of holder
10. ・ CFRP pipe (first tubular member)
20..Fitting (second tubular member)

Claims (4)

A first tubular member having a uniform inner peripheral surface formed by resin molding and pulled out by a cored bar in a tubular member joining structure in which a first tubular member and a second tubular member are fitted and joined using an adhesive. A member, a second tubular member made of metal having an outer periphery larger than the inner periphery of the first tubular member, and an outer peripheral surface cut along a tube axis from the end of the second tubular member over a predetermined length. A locking portion for locking the movement in the tube axis direction provided on the insertion end side of the second tubular member, which is a fitting region between the notched first tubular member and the second tubular member, and a second of the fitting region The outer peripheral surface of the tubular member is cut out and adhered to the hollow portion forming the adhesive filling space that is in contact with the inner peripheral surface of the first tubular member and the end of the second tubular member on the tube axis side. A porous member having resilience larger than the inner periphery of the first tubular member and corresponding to the adhesive filling space. A hole provided in the fitting region of the first tubular member, and an adhesive filled in the adhesive filling space, fixing the first tubular member at the locking portion, and A tubular member joining structure in which an inner peripheral surface and an outer peripheral surface in the tube axis direction of the porous member are pressure-bonded. A tubular member joining structure in which a plurality of tubular members and a joint-like tubular member are fitted and joined using an adhesive, is a first resin having a uniform inner peripheral surface that is resin-molded and pulled out with a cored bar. A tubular member, a second tubular member made of a metal having an outer periphery larger than the inner periphery of the first tubular member and having both ends opened, and a predetermined length along the tube axis from an end on one end side of the second tubular member The outer peripheral surface is cut out over the length, and the tube axial movement provided in the first insertion end side of the second tubular member in the first fitting region between the first tubular member and the second tubular member is locked. A first adhesive filling space that is in contact with the inner peripheral surface of the first tubular member that is partially provided by cutting out the outer peripheral surface of one end side of the second tubular member in the first fitting region. Adhered to the first dent portion to be formed and the end portion on the one end side on the tube axis side of the second tubular member, the inner circumference of the first tubular member A first porous member having a large resilience, a first hole provided in the first fitting region of the first tubular member corresponding to the first adhesive filling space, and the first adhesive An adhesive filled in the agent filling space, and a third inner surface having a uniform inner peripheral surface formed by a resin whose outer periphery is larger than that of the first tubular member and whose inner periphery is equal to that of the first tubular member, and is drawn out with a cored bar. In the second fitting region between the tubular member and the second tubular member, the outer peripheral surface is cut out over a predetermined length along the tube axis from the other end of the second tubular member. A second locking portion for locking the movement in the tube axis direction provided on the second insertion end side of the second tubular member, and an outer peripheral surface on the other end side of the second tubular member in the second fitting region. A second recess portion forming a second adhesive filling space in contact with the inner peripheral surface of the third tubular member provided partially, and a tube axis of the second tubular member A second porous member that is adhered to an end of the other end of the third tubular member and has resiliency larger than the inner circumference of the third tubular member, and a third tubular member corresponding to the second adhesive filling space A second hole provided in the second fitting region; and an adhesive filled in the second adhesive filling space, wherein the first tubular member is fixed by the first locking portion and first The inner peripheral surface of the tubular member and the outer peripheral surface of the first porous member in the tube axis direction are pressure-bonded, the third tubular member is fixed by the second locking portion, and the inner peripheral surface of the third tubular member and the above-mentioned The joining structure of the tubular member which crimped | bonded the outer peripheral surface of the pipe-axis direction of the 2nd porous member. In a method for joining tubular members, in which a first tubular member and a second tubular member are fitted and joined using an adhesive, the first tubular member having a uniform inner peripheral surface formed by resin molding and pulled out by a cored bar. The outer peripheral surface to be inserted into the member is cut out from the end of the second tubular member made of a metal larger than the inner periphery of the first tubular member over a predetermined length along the tube axis, and the first tubular member and the first tubular member are cut out. A cutting step of providing a fitting region with the two tubular members and providing a locking portion for locking movement in the tube axis direction on the insertion end side of the second tubular member; and an outer peripheral surface of the second tubular member in the fitting region A step of cutting out a groove and forming a recess that forms an adhesive filling space partially in contact with the inner peripheral surface of the first tubular member, and a porous material having resilience that is larger than the inner periphery of the first tubular member A sticking step of sticking the member to the end of the second tubular member on the tube axis side, and the bonding A drilling step of providing a hole in the fitting region of the first tubular member corresponding to the filling space; fixing the first tubular member and the second tubular member at the engaging portion; and an inner periphery of the first tubular member Sealing that seals the gap between the end of the first tubular member and the engaging portion of the second tubular member with an insertion step of crimping the surface and the outer peripheral surface of the porous member in the tube axis direction with a sealing material A first tubular member filled with an adhesive while injecting an adhesive into the adhesive filling space from the hole of the first tubular member and discharging air from the porous member through the porous member; The joining method of the tubular member provided with the adhesive agent injection | pouring process of joining a 2nd tubular member. A tubular member joining method in which a plurality of tubular members and a joint-like tubular member are fitted and joined using an adhesive, the first having a uniform inner peripheral surface formed by resin molding and pulled out by a cored bar. The outer peripheral surface of the second tubular member whose outer periphery to be inserted into the tubular member is made of a metal larger than the inner periphery of the first tubular member and having both ends opened from the end on one end side along the tube axis over a predetermined length. A first engagement region is provided between the first tubular member and the second tubular member, and a first locking portion for locking movement in the tube axis direction is provided on the first insertion terminal side of the second tubular member. 1 cutting process and the 1st adhesive agent filling space which contact | connects the internal peripheral surface of the 1st tubular member partially provided by notching the one end side outer peripheral surface of the 2nd tubular member of the said 1st fitting area | region are formed. The first grinding step for providing the first recess and the resilience that is similar to the inner circumference of the first tubular member. And a first fitting of the first tubular member corresponding to the first adhesive filling space, and a sticking step of adhering the first porous member to the end of the second tubular member on the tube shaft side A first drilling step of providing a hole in the region, fixing the first tubular member and the second tubular member with the first locking portion, and the inner peripheral surface of the first tubular member and the first porous member A first insertion step of pressure-bonding the outer peripheral surface in the tube axis direction; a first sealing step of sealing a gap between an end portion of the first tubular member and the first locking portion of the second tubular member with a sealing material; Injecting the adhesive into the first adhesive filling space from the hole of the first tubular member and filling the adhesive while discharging the air in the first adhesive filling space from the first porous member. The adhesive injection step of joining the first tubular member and one end of the second tubular member, and the outer periphery is more than the first tubular member. Hear the circumference is molded with resin is equal to the first tubular member, the tube axis from the other end of the second tubular member to be inserted into the third tubular member having a uniform inner peripheral surface which is withdrawn at the core metal The outer peripheral surface of the second tubular member is cut out along a predetermined length to provide a second fitting region for the third tubular member and the second tubular member, and the second tubular member is moved in the tube axial direction toward the second insertion terminal side. A second cutting step for providing a second locking portion for locking the inner surface of the second tubular member, and a third tubular member partially provided by cutting away the outer peripheral surface of the second tubular member in the second fitting region. A second grinding step for providing a second recess for forming a second adhesive filling space in contact with the peripheral surface, and a second porous member having resilience larger than the inner circumference of the third tubular member and similar to the second tubular member. A second affixing step for adhering to the other end of the member on the tube axis side, and a third tube corresponding to the second adhesive filling space A second drilling step of providing a hole in the second fitting region of the cylindrical member, fixing the third tubular member and the second tubular member with the second locking portion, and an inner peripheral surface of the third tubular member And a second insertion step of crimping the outer peripheral surface of the second porous member in the tube axis direction , and a gap between the end of the third tubular member and the second locking portion of the second tubular member by a sealing material A second sealing step for sealing, and an adhesive is injected into the second adhesive filling space from the hole of the third tubular member, and air in the second adhesive filling space is discharged from the second porous member. A tubular member joining method comprising: a second adhesive injection step of filling the adhesive while discharging and joining the third tubular member and the other end of the second tubular member.

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