JP4227045B2 - Tubular member joining method and tubular member joining structure - Google Patents

Description

  The present invention relates to a joining method and a joining structure when joining tubular members such as CFRP pipes, for example.

  Conventionally, for example, iron and aluminum have been the main materials for pipe materials used in the back structure of satellite communication antennas and truss structures such as buildings. However, with iron and aluminum, it is difficult to reduce the weight because of its high specific gravity, and because the linear expansion coefficient is large, the dimensional change due to the temperature difference of the outside air is large, making it unsuitable for precision equipment. In recent years, due to the fact that it is difficult to obtain high accuracy by thermal deformation, in recent years, there has been a demand for higher accuracy, lighter weight, lower thermal deformation, etc. in equipment structures that require high accuracy, such as optical telescopes. In order to meet such demands, materials such as three-dimensional trusses and pole structures using lightweight, rigid and low linear expansion coefficients, such as GFRP tubes and CFRP tubes, have appeared. Since these materials cannot be welded, they are assembled by bonding the pipe members or the pipe and the joint by bonding. In joining with an adhesive, it is very important to uniformly apply the adhesive to the joint surface in order to ensure strength.

As a bonding structure that uniformly applies an adhesive to a tubular member to increase the bonding strength, a method of bonding an adhesive by providing a space for filling an adhesive in a bonding portion has been known for a long time. As an example of applying this technique to the joining of GFRP pipes, for example, two GFRP pipes having an annular seal material on the outer periphery in the vicinity of the end from both sides of a joint having an annular protrusion on the inner periphery of a substantially tubular center. The end of each GFRP pipe is pressed against the annular protrusion inside the joint, and at the same time, the seal part of each GFRP pipe is pressed against both ends of the joint, and an annular seal is formed between the joint and each GFRP pipe. A space is formed, and an inlet and an outlet that communicate with the sealed space are provided on the outer periphery of the joint. Then, while injecting the adhesive from the injection port, the air in the sealed space is drawn from the discharge port to be filled with the adhesive and solidified (for example, see Patent Document 1).
In addition, as a technique for semi-automatically injecting an adhesive into an adhesive filling portion using an injector, for example, an injection pipe is fixed to the injection portion, and the nozzle portion of the injector that has previously sucked the adhesive is used for injection. A method of communicating with the pipe, locking one end of the rubber band to the back of the plunger of the injector, and locking the other end to the tip of the injector, and press-fit the adhesive using the elasticity of the rubber band Is disclosed (see, for example, Patent Document 2).

JP-A-5-346189 (2nd page, FIG. 2) JP 58-123971 A (first page, FIG. 1)

Since the joint portion of the conventional tubular member is configured as described above, the adhesive can be efficiently injected into the joint surface. However, as the tube diameter increases, the adhesive injected from the injection port fills the entire annular sealed space. In the meantime, it leaks from the discharge port, and there is a problem that air is trapped inside the sealed space and the adhesive is not sufficiently filled. For this reason, a technique is also known in which a partition is provided in a sealed space to guide the adhesive from the inlet to the outlet, but even in that case, the adhesive should pass through the shortest distance when the pipe diameter is large. It is difficult to completely eliminate air pockets. Moreover, since the flow path of the adhesive becomes longer due to the partition, there is a problem that it takes more work time.
In addition, when using an injector such as the one described above when injecting an adhesive, since an injector dedicated to the adhesive is used, a large number of dedicated injectors must be prepared if the number of injection locations increases. There was a problem that the work cost was high.

  The present invention has been made to solve the above-described problems. A tubular member joining method and a tubular member joining structure capable of uniformly filling an adhesive filling space with an adhesive with a simple configuration. The purpose is to obtain.

In the tubular member joining method according to the present invention, the second tubular member is inserted on the inner peripheral side of the first tubular member to form a fitting portion having a predetermined length, and the tubular member is joined using an adhesive. In the member joining method, a locking portion for locking the axial movement of the second tubular member is provided on the inner periphery of the first tubular member, and the inner peripheral surface of the first tubular member of the fitting portion or the first An annular recess is provided on the outer peripheral surface of the tubular member 2 to form an adhesive filling space, an adhesive injection port communicating with the adhesive filling space is provided in the first tubular member, and an insertion end of the second tubular member; An elastic porous member is sandwiched between the engaging portion and the gap between the end of the first tubular member and the outer peripheral surface of the second tubular member is sealed with a sealing material, the adhesive is injected from the inlet to the adhesive filling the space, the tube of the adhesive while discharging air from the adhesive filled in the space from the porous member Outflow to are those suppressed by the porous member, and so as to join the two tubular members filled with an adhesive.
Further, in the tubular member joining structure according to the present invention, the second tubular member is inserted into the inner peripheral side of the first tubular member to form a fitting portion having a predetermined length, and joined using an adhesive. In the joining structure of the tubular members, a locking portion for locking the axial movement of the second tubular member is provided on the inner periphery of the first tubular member, and the inner peripheral surface of the first tubular member of the fitting portion or An annular recess is provided on the outer peripheral surface of the second tubular member to form an adhesive filling space, an adhesive injection port communicating with the adhesive filling space is provided in the first tubular member, and an insertion end of the second tubular member the outer peripheral surface of the between the engaging portion, the outflow of it adhesive air have a resilient discharges will sandwich the porous member to suppress the ends of the first tubular member and second tubular member gap was sealed with a sealing material to prevent leakage during adhesive injection, against both the tubular member and filled with an adhesive to the adhesive filling the space between the One in which the.

According to the method for joining tubular members of the present invention, an adhesive filling space is provided at the joint between the first annular member and the second annular member, the outer side thereof is sealed with the sealing member, and the inner side is elastic. A porous member having a gap is provided, an adhesive is injected from an adhesive inlet, and air is discharged from the porous member to the inside of the pipe while discharging air in the adhesive filling space . Since the adhesive is filled by suppressing the adhesive, the adhesive can be uniformly filled in the adhesive filling space.
Moreover, according to the connection structure of the tubular member of the present invention, an adhesive filling space is provided at the joint between the first annular member and the second annular member, and the outer side prevents leakage at the time of injecting the adhesive. sealed with a sealing member, the internal side outflow is closed and air is discharged elasticity adhesive provided to sandwich the porous member to suppress, since the bonded by filling the adhesive in the adhesive filling the space The adhesive is uniformly filled and securely bonded to ensure a predetermined strength.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a state before joining in the annular member joining method according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view showing the joined state. In FIG. 1, the first tubular member 1 has an inner diameter smaller than the outer diameter of the second tubular member, and an inner diameter at which the second tubular member 2 fits from the entrance side to the back side of the end portion. A fitting inner diameter portion 3 having a predetermined length is provided. A stepped portion on the back side of the fitting inner diameter portion 3 serves as an axial locking portion 4 when the second tubular member 2 is inserted. Further, the fitting inner diameter portion 3 is provided with an annular recess 5 for forming an adhesive filling space described later. Further, an adhesive injection port 6 is provided on the entrance side of the annular recess 5 so as to communicate with the outside.
In the second tubular member 2, a porous member 7 having elasticity at the tip is attached with, for example, a double-sided tape. The reason why the porous member 7 is affixed to the distal end portion of the second tubular member 2 is for assembly workability and does not necessarily have to be adhered. In addition, the above-described locking portion 4 may be formed by providing an annular protrusion on the inner periphery of the first tubular member, for example, in addition to the stepped processing.

The material of the tubular members 1 and 2 is not particularly limited, but is, for example, GFRP or CFRP. The pipes may be joined together, and one tubular member may be a pipe joint. In this case, either the first tubular member or the second tubular member may be used as a pipe joint. However, if the first tubular member is a pipe joint, processing is only performed on the pipe joint side, which is preferable from the viewpoint of workability. It should be noted that the material for the pipe joint is usually metal, and for example, when applied to a structure that supports precision equipment, for example, Super Invar is used. In addition, the porous member 7 is more effective than the hard one, and the easily available one may be, for example, a commercially available sponge.
The size of the tubular member is, for example, an outer diameter of 100 mm and a thickness of about 5 mm when used for a large precision instrument support structure exceeding 10 m. In this case, the fitting gap between both tubular members is 0. 0.1 mm, and the depth of the annular recess 5 is about 0.2 to 0.5 mm.

  Next, the joining method will be described. When the second tubular member 2 is inserted into the fitting inner diameter portion 3 of the first tubular member 1 and pressed from the state shown in FIG. 1, the porous member 7 becomes the second tubular shape as shown in FIG. It is crushed and pinched between the front end of the member 2 and the locking portion 4 to be in a fitted state. At this time, an adhesive filling space 8 is formed between the annular recess 5 provided in the first tubular member 1 and the outer peripheral surface of the second tubular member 2. In this state, a minute gap between the end of the first tubular member 1 and the outer peripheral surface of the second tubular member 2 is sealed by the sealing material 9. Next, injection of a predetermined amount of adhesive from the adhesive inlet 6 is started.

  By the injection operation, the air inside the adhesive filling space 7 is pushed by the adhesive and tends to escape through the gap between the tubular members 1 and 2. Since the entrance side is sealed with the sealing material 9, it passes through the interior of the porous member 7 from the gap on the back side and is first discharged to the inside of the tubular member 1 as indicated by the arrow. The injected adhesive flows in the adhesive filling space 8 to the back side, first reaches the porous member 7 in the shortcut, and enters the inside thereof. Then, the air permeability of the porous member 7 in that portion is almost lost and the resistance increases, so that the adhesive spreads toward the porous member 7 side where the adhesive has not yet reached. That is, since the porous member 7 is pressed as shown in the figure and the bubble portion is clogged, the air is discharged but the adhesive is hardly discharged. Then, the air circulation holes on the entire circumference are closed from the point where the adhesive reaches, and finally the air circulation holes on the entire circumference are closed. In this way, the adhesive is filled almost uniformly over the entire surface of the adhesive filling space 8. The adhesive that has reached the porous member 7 slightly passes through the inside and leaks to the inside of the first tubular member 1, but the porous member 7 that is sandwiched between the locking portions 4 and protrudes to the inside. It can be prevented from dripping inward by being absorbed and held in relatively large bubbles.

As described above, according to the invention of the present embodiment, the adhesive filling space is provided in the joint portion between the first annular member and the second annular member, the outer side thereof is sealed with the sealing member, and the inner side Sandwiches a porous member with elasticity, injects an adhesive from the adhesive inlet , and discharges the air inside the adhesive filling space from the porous member while the adhesive flows out to the inside of the tube. Since the adhesive is filled by being suppressed by the member , the adhesive can be uniformly filled in the adhesive filling space. Therefore, both tubular members can be securely bonded to ensure a predetermined strength, and the occurrence of twisting and distortion due to uneven bonding can be suppressed, so it is particularly applicable to precision instrument truss structures that require accuracy and strength. Can be effective. Furthermore, since the adhesive does not leak to the outside, the joining portion is not soiled, and the cleaning work is not required.

  1 and 2 show the case where the annular recess 5 for the adhesive filling space is provided on the inner peripheral surface of the first tubular member 1, the outer periphery of the fitting portion of the second tubular member 2 is shown. Even if it is provided on the surface, the same effect can be obtained.

Embodiment 2. FIG.
FIG. 3 is a perspective view showing parts of the adhesive injector of the method for joining tubular members according to the second embodiment, and FIG. 4 is a front view of the adhesive injector combining them. In the method for joining the tubular members, the steps until the two tubular members are fitted are the same as those in FIGS. The present embodiment is characterized in that an adhesive injector is used when the adhesive is injected from the adhesive injection port 6 in FIG. 2 of the first embodiment. The adhesive injector will be described below.

  As shown in FIG. 3, the main body part of the adhesive injector is a general-purpose syringe 10 (but no needle is required) made of a commercially available polyethylene resin. The syringe 10 includes an outer cylinder 11 and a plunger 12. The outer cylinder holder 13 to be mounted on the distal end side of the outer cylinder 11 is formed by bending the belt-like plate into a U shape with a width that the outer cylinder 11 fits, and further bending the both ends into an U shape with the outer ends facing outward. A locking portion 13a of a rubber band which will be described later is formed. Furthermore, a hole 13b is provided in the center for passing through the nozzle portion of the outer cylinder 11. The plunger holder 14 to be mounted on the plunger 12 side is bent in a U shape with a width in which the rear end of the plunger 12 is fitted, and a slit 14a for inserting a stopper is provided on both sides of the bent plate. The stopper 15 is formed by bending a thin plate into a U shape with a width larger than that of the plunger 12, and a handle 16 is provided. The length of the stopper 15 is appropriately manufactured according to the amount of adhesive to be injected. In addition, two annular rubber bands 17 are prepared. As the material of the outer cylinder holder 13, the plunger holder 14, and the stopper 15, for example, an easily processed aluminum plate is used. The rubber band 17 may be a commercially available rubber band. Tension can be adjusted by changing the number of rubber bands. The adhesive injector 18 is constituted by the above 10-17.

  FIG. 4 shows a combination of the above parts. The required amount of adhesive is sucked into the syringe 10, the outer cylinder holder 13 and the plunger holder 14 are set, and the stopper 15 is inserted between the slit 14 a of the plunger holder 14 and the finger hook at the end of the outer cylinder 11. . In this state, the rubber band 17 is stretched over the engaging portion 13a of the outer cylinder holder 13 and the end portion of the plunger holder 14.

  Next, an adhesive injection operation will be described. The nozzle portion of the adhesive injector 18 is inserted and fixed into the adhesive inlet 6 at the joint portion of the tubular member. At this time, if the adhesive injection port 6 is threaded, the nozzle part bites into the screw because the syringe 10 is made of polyethylene resin. There is no need to keep. When the stopper 15 is pulled out by pulling the knob 16 of the stopper 15 after the attachment is completed, the stopper 15 is released and the plunger 12 is pushed into the outer cylinder 11 by the elasticity of the rubber band 17 so that the adhesive adheres to the joint. The agent is gradually injected into the agent injection space 8.

  A method for injecting the adhesive more efficiently by applying the above-described adhesive injector will be described. When the outer diameter of the tubular member is increased, injection takes time and workability is reduced. Therefore, as shown in FIG. 5, a plurality (two in the drawing) of the adhesive injection ports 6 are provided around the first tubular member 1, and the adhesive injector 18 is attached to all of them. When injecting the adhesive, the stopper 15 is released almost simultaneously and the injection is started simultaneously at a plurality of locations. FIG. 6 is a diagram illustrating the flow of the adhesive at this time, and is an explanatory diagram in which the adhesive filling space 8 is developed in the circumferential direction. As shown in the figure, the adhesive flows simultaneously from the adhesive inlet 6 toward the porous member 7. Therefore, the injection time can be greatly shortened.

  As described above, according to the invention of the present embodiment, since the adhesive is injected using a general-purpose syringe, a simple holding member, a stopper, and a rubber-like member, Cost can be reduced compared with the case of using a dedicated injector. In addition, by providing a stopper in the adhesive injector, it is possible to inject adhesive into multiple locations at the same time, so the injection operation time can be shortened, and distortion is reduced because the adhesive at multiple joint locations cures simultaneously. This improves the quality of the joining member

  In addition, since a plurality of adhesive injection ports are provided in the outer peripheral direction of the first tubular member, and the adhesive is injected at the same time by the adhesive injector, the injection time is greatly shortened.

  Note that the invention according to the present embodiment has a remarkable effect in joining large-sized devices and tubular members of structures. For example, consider a case where a structure exceeding 10 m is assembled on a solid truss with a CFRP tube. Since it is difficult to assemble the whole at once, it is usually assembled in blocks of about several meters. Even in that case, the number of joints is several tens to several hundreds. First, temporarily assemble the structure into a shape close to completion for each block using a jig, adjust the dimensions of the entire truss, and then attach an adhesive injector to all the adhesive inlets of the pipe joint at the joint. Install. Next, when the stoppers of all the adhesive injectors are released almost simultaneously, the injection of all joints is started at once, and the joints can be finished almost simultaneously in a short time. For this reason, since the distortion of the structure due to the difference in the curing time of the adhesive can be suppressed, the effect is particularly great in the structure of a precision instrument. In addition, if a dedicated injector is used for an adhesive injection part that exceeds several thousand locations as a whole, a certain assembly cost is required. However, the adhesive injector of this embodiment is a simple and inexpensive commercially available syringe. Since it consists only of members, significant cost reduction can be achieved.

  In addition to joining tubular members such as CFRP pipes and GFRP pipes, the present invention can be applied to joining of resin pipes and metal pipes in general.

It is sectional drawing which shows the state before joining of the joining method of the annular member by Embodiment 1 of this invention. It is sectional drawing which shows the joining state of the joining method of the annular member by Embodiment 1 of this invention. It is a perspective view which shows each component of the adhesive injector of the joining method of the tubular member by Embodiment 2 of this invention. It is a front view of the adhesive agent injector of the joining method of the tubular member by Embodiment 2 of this invention. It is sectional drawing at the time of providing the adhesive injection port with multiple in the joining method of the tubular member by Embodiment 2 of this invention. It is explanatory drawing explaining the flow of the adhesive agent in the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st tubular member 2 2nd tubular member 4 Locking part 5 Annular recessed part 6 Adhesive injection port 7 Porous member 8 Adhesive injection space 9 Sealing material 10 Syringe 11 Outer cylinder 12 Plunger 13 Outer cylinder holder 14 Plunger holder 15 Stopper 17 Rubber band 18 Adhesive injector.

Claims (5)

In the method for joining tubular members, the second tubular member is inserted into the inner peripheral side of the first tubular member to form a fitting portion having a predetermined length, and joined using an adhesive. A locking portion for locking the axial movement of the second tubular member is provided on the inner periphery of the member, and the inner peripheral surface of the first tubular member or the outer periphery of the second tubular member of the fitting portion An annular recess is formed on the surface to form an adhesive filling space, an adhesive injection port communicating with the adhesive filling space is provided in the first tubular member, and the insertion end of the second tubular member and the locking A porous member having elasticity between the first tubular member and a gap between the end portion of the first tubular member and the outer peripheral surface of the second tubular member is sealed with a sealing material, and the adhesive the adhesive is injected from the injection port into the adhesive filling the space, discharging air from the adhesive filled in the space from the porous member Method for joining tubular member characterized by outflow into the tube side of the adhesive is suppressed by the porous member, and filled with the adhesive joining the two tubular members while.   2. The method for joining tubular members according to claim 1, wherein the adhesive is injected from the adhesive inlet by an adhesive injector. 3. The method for joining tubular members according to claim 2, wherein the adhesive injector includes a general-purpose syringe, an outer cylinder holder provided on the nozzle side of the outer cylinder of the syringe, and a plunger holder provided on the plunger side of the syringe. And a stopper that holds the insertion length of the plunger into the outer cylinder to a predetermined dimension, and a rubber band that spans between the outer cylinder holder and the plunger holder, and is filled with an adhesive. A method for joining tubular members, wherein an injector is set at the adhesive inlet, the holding of the stopper is released, and the adhesive is injected by the elasticity of the rubber band.   4. The method for joining tubular members according to claim 3, wherein a plurality of the adhesive injection ports are provided in an outer peripheral direction of the first tubular member, and the adhesive injection is set in all of the plurality of the adhesive injection ports. A method for joining tubular members, characterized in that the injection operation is carried out almost simultaneously by means of a vessel. In the joining structure of tubular members in which a second tubular member is inserted into the inner peripheral side of the first tubular member to form a fitting portion of a predetermined length and joined using an adhesive, the first tubular member A locking portion for locking the axial movement of the second tubular member is provided on the inner periphery of the member, and the inner peripheral surface of the first tubular member or the outer periphery of the second tubular member of the fitting portion An annular recess is formed on the surface to form an adhesive filling space, an adhesive injection port communicating with the adhesive filling space is provided in the first tubular member, and the insertion end of the second tubular member and the locking between the parts, the outflow of it adhesive air have a resilient discharges will sandwich the porous member to suppress, the outer peripheral surface of the first tubular member end portion and the second tubular member and gap sealed by a sealing member to prevent leakage when the adhesive injected, the both tube was filled with an adhesive to the adhesive-filled space Joint structure of the tubular member, characterized in that joining the members.

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