JP2009047302A - Connection structure of metal-resin composite pipes and metal-resin composite pipe for use in the connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of metal-resin composite pipes that eliminates the need for arranging thick connection flanges and realizes easy connection work, that avoids an increase of the weight of a pipe itself, that realizes easy arrangement and adjustment, that comprises high stability in the connection part and sufficient water resistance and pressure resistance, and easy to be manufactured. <P>SOLUTION: A diameter-expanded part 4 is formed at an opposing end 10 of a first metal-resin composite pipe 1A by pressurizing and deforming outward a reinforcing convex part 3 including the one end 10 together with a main body 2 positioned inside the reinforcing convex part. A diameter-reduced part 5 is formed at the other end 11 of a second metal-resin composite pipe 1B by pressurizing and deforming inward at least the reinforcing convex part 3 including the other end 11. The diameter-reduced part 5 is inserted into the diameter-expanded part 4. A sealing member 6 is interposed in a gap between an inner surface of the diameter-expanded part 4 and an outer surface of the diameter-reduced part 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is configured by providing a reinforcing projection spirally on the outer peripheral side of a synthetic resin main body having a substantially flat inner surface, and is used as a drainage pipe under a road, a drainage pipe for sewerage, etc. The present invention relates to a resin pipe connection structure.

  Conventionally, concrete fume pipes are generally used as drainage pipes under roads and sewerage drains, but in recent years they have strengths equal to or higher than those of fume pipes, and are durable and lightweight. In addition, as a synthetic resin tube that is advantageous in terms of labor saving at the time of construction, a tube having a reinforcing projection spirally provided on the outer peripheral side of the main body portion whose inner surface is substantially flat is used. When connecting a plurality of such synthetic resin pipes, place a half joint with a connecting flange with a packing sheet set on the inner surface at each end facing each other, and between the water blocking block and the recess Fill it with caulking material to fill the gaps that occur, wind the packing sheet around the pipe while fully pulling it, and fix it with vinyl tape, etc. The structure is fastened with a nut and fixed.

  However, this type of connection structure requires a pair of upper and lower halved joints, packing sheets, caulking materials, etc. to be assembled on-site in accordance with the connection procedure. It was annoying. In particular, the work of moving two pipes to a specific position on the packing sheet after placing the packing sheet on the inner surface side of the halved joint places a heavy burden on the operator. The tension of the sheet varies from person to person, causing variations in quality.

  On the other hand, as a connection structure that allows easy and quick connection work, a flange for connection is provided at the end of the synthetic resin pipe, for example, by welding or the like, and a packing is provided on a contact surface that brings the flanges into surface contact. There has been proposed a connection structure that completes a connection operation simply by tightening (see, for example, Patent Document 1). According to such a connection structure, workability can be improved and a highly reliable connection structure can be provided. However, providing such a connecting flange projecting outwardly at the end of the synthetic resin tube makes it difficult to route and adjust after the connection, and the tube floats at the connection portion and becomes unstable. . In addition, such a connection flange needs to be connected with bolts and nuts, and a certain amount of thickness is required to maintain the connection strength, which causes the weight of the tube itself and the decrease in work efficiency. Become. Further, such a structure for stopping water with a connecting flange causes water leakage unless the welded portion of the flange attached to the pipe end is securely watertight, and therefore requires high quality. In addition, since the flange surfaces are connected via packing, there is a limit to the water resistance and pressure resistance to the outside of the part, and there is a limit to improving the working efficiency, such as even tightening of bolts and nuts is required. there were.

JP 2002-139178 A

  Therefore, in view of the above situation, the present invention is to solve the problem by eliminating the need to provide a connection flange having a thickness, enabling easy connection work and avoiding the weight of the pipe itself. It is an object of the present invention to provide a metal-resin composite pipe connection structure that can be easily routed and adjusted after connection, has high stability at the connection part, has sufficient water resistance and pressure resistance, and is easy to manufacture.

  As a result of intensive studies for solving the above-mentioned problems, the present inventor has found that the metal member deforms the reinforcement projection in the metal resin composite pipe in which the reinforcement projection made of the metal member is provided on the outer peripheral side in a spiral shape. Focusing on the fact that it has a function to maintain the shape after the deformation, if one of the ends of the metal-resin composite pipe is deformed into an expanded state and the other is deformed into a contracted state, both are fitted. Together, it was found that a structure capable of easily completing the connection work can be realized, and the present invention has been completed.

  That is, according to the present invention, two metal resin composite tubes formed by providing reinforcing projections made of metal members in a spiral shape on the outer peripheral side of a synthetic resin main body having a substantially flat inner surface are mutually connected at the ends. A connecting structure for connecting, wherein the reinforcing convex portion constituting the end portion is pressed outward together with the main body portion located inside the end portion facing the first metal resin composite pipe A diameter-expanded portion is formed by deformation, and at least the reinforcing convex portion constituting the end portion is compressed and deformed inward at the facing end portion of the second metal resin composite pipe. A diameter portion is formed, and the reduced diameter portion of the second metal resin composite tube is inserted into the enlarged diameter portion of the first metal resin composite tube. Metal resin composite pipe connection structure characterized in that a seal member is interposed in the gap on the side Configuration was.

  Here, it is preferable that the reduced diameter portion is formed by crushing a reinforcing convex portion constituting an end portion of the second metal resin composite pipe.

  Further, a structure in which a cylindrical member is water-tightly attached to the inner surface of the enlarged diameter portion and the outer surface of the reduced diameter portion, respectively, and a seal member is interposed in a gap between the cylindrical members in the inserted state.

  In this case, a first end retaining ring that clamps the tip of the enlarged diameter portion and the tip of the cylindrical member attached to the inner surface thereof is provided, and the first tip of the reduced diameter portion and the tip of the cylindrical member attached to the outer surface thereof are clamped. A structure in which two end stopper rings are provided is preferable.

  Further, a structure in which a sealing ring that seals between the outer surface of the second metal resin composite tube is provided on the proximal end side of the cylindrical member attached to the outer surface of the reduced diameter portion is preferable.

  Such a cylindrical member may be made of metal, but is preferably formed of a synthetic resin member having a spiral or annular rib.

  Furthermore, it is preferable that the reduced diameter portion is formed in a tapered shape that tapers toward the opening end, and a tapered tubular member is also attached to the outer surface of the reduced diameter portion, and particularly, the inner diameter is attached to the inner surface of the enlarged diameter portion. The cylindrical member is preferably configured to be tapered so as to be substantially parallel to the tapered cylindrical member attached to the outer surface of the reduced diameter portion.

  Further, a structure in which the reduced diameter portion is inserted into the cylindrical member attached to the inner surface of the enlarged diameter portion in a state where a ring-shaped seal member is externally mounted on the cylindrical member attached to the outer surface of the reduced diameter portion is preferable. The ring-shaped seal member may be inserted into a cylindrical member attached to the outer surface of the reduced diameter portion in the enlarged diameter portion in a state of being internally attached to the cylindrical member attached to the inner surface of the enlarged diameter portion. .

  Further, the present invention is a metal resin composite tube used in the connection structure described above, wherein a reinforcing convex portion made of a metal member is provided in a spiral shape on the outer peripheral side of a synthetic resin main body portion whose inner surface is substantially flat. The one end portion is formed with a diameter-enlarged portion by pressurizing and deforming the reinforcing convex portion constituting the one end portion together with the main body portion located inside thereof, and the other end portion is formed with the other portion. A metal resin composite pipe characterized in that a reduced diameter portion is formed by pressurizing and deforming at least the reinforcing convex portion constituting the end portion inward.

  Here, it is preferable that the reduced diameter portion formed at the other end portion is formed by crushing the reinforcing convex portion constituting the other end portion. Moreover, what attached the cylindrical member to each of the inner surface of the said enlarged diameter part and the outer surface of a reduced diameter part watertight is preferable. Here, a first end retaining ring is provided for sandwiching the distal end of the enlarged diameter portion and the distal end of the cylindrical member attached to the inner surface thereof, and the second end for sandwiching the distal end of the reduced diameter portion and the distal end of the cylindrical member attached to the outer surface thereof. A structure provided with an end stopper ring is preferable, and a sealing ring for sealing between the outer surface of the second metal resin composite tube is provided on the proximal end side of the cylindrical member attached to the outer surface of the reduced diameter portion. A structure is preferred. Such a cylindrical member may be made of metal, but is preferably constituted by a synthetic resin member having a spiral or annular rib. Further, it is preferable that the diameter-reduced portion is tapered toward the opening end, and a tapered tubular member is attached to the outer surface of the diameter-reduced portion. It is preferable that the cylindrical member to be attached is configured in a tapered shape so as to be substantially parallel to the tapered cylindrical member to be attached to the outer surface of the reduced diameter portion. And it is preferable that the cylindrical member attached to the outer surface of the reduced diameter portion is externally provided with a ring-shaped seal member, or the cylindrical member attached to the inner surface of the enlarged diameter portion is internally provided with a ring-shaped seal member.

  According to the present invention as described above, since the connection work is completed only by the insertion work of the enlarged diameter part and the reduced diameter part in which the pipe end portions are pressed and deformed outward and inward, respectively, the conventional connection flange The bolts and nuts are not required to be evenly tightened, as in the case of the one provided with, so that the work efficiency is remarkably improved and there is no need to attach a separate connection flange as in the conventional case by welding, etc. The weight of itself can be reduced. In addition, there is no flange part that protrudes outward like a conventional connection flange, and because the fitting is between the enlarged diameter part and the reduced diameter part, it is avoided that the connection part protrudes outward, This facilitates routing and adjustment after connection, and increases the stability of the connection portion. Furthermore, in such a fitting structure of the enlarged diameter portion and the reduced diameter portion, the enlarged diameter portion securely wraps the connection portion, so that a simple seal structure can provide sufficient water resistance and pressure resistance. In addition, as compared with the conventional work for attaching the connecting flange in a watertight manner with high accuracy, the manufacturing is also facilitated.

  Moreover, since the said diameter reduction part crushes the reinforcement convex part which comprises the edge part of the said 2nd metal resin composite pipe | tube, it is possible to comprise without reducing the diameter of the inner body part. Thus, deformation to the inside of the main body that hinders running water can be avoided.

  In addition, a cylindrical member is attached to the inner surface of the enlarged diameter portion and the outer surface of the reduced diameter portion in a watertight manner, and a sealing member is interposed in a gap between the cylindrical members in the inserted state. It becomes a structure which can easily realize a stable watertight state between the cylindrical members regardless of the presence of the portion.

  In addition, a first end stopper ring is provided for sandwiching the distal end of the enlarged diameter portion and the distal end of the cylindrical member attached to the inner surface thereof, and the first end retaining ring is sandwiched between the distal end of the reduced diameter portion and the distal end of the cylindrical member attached to the outer surface thereof. Since the end stop rings of 2 are provided, the appearance of each end portion is improved, and rainwater or the like enters from the outside between the front ends of the first end stop ring exposed to the outside. The second end stopper ring can function as a seal that prevents fluid flowing through the inside from entering between the tips that will be exposed to the inside. Can be made.

  Moreover, since the sealing ring which seals between the outer surface of the 2nd metal resin composite pipe | tube was armored on the base end side of the cylindrical member attached to the outer surface of the said reduced diameter part, rainwater etc. from the outside Intrusion can be prevented and appearance can be improved.

  In addition, since the cylindrical member is composed of a synthetic resin member having a spiral or annular rib, it is possible to perform reliable sealing while reducing the weight.

  In addition, the diameter-reduced portion is formed in a taper shape that tapers toward the opening end, and the same tapered tubular member is attached to the outer surface of the diameter-reduced portion, so that the connection work can be performed more smoothly. Thus, the sealing performance can be further improved.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an explanatory view showing the overall configuration of the connection structure of the metal resin composite tube according to the present invention, and FIG. 4 is an explanatory view showing the overall configuration of the metal resin composite tube used in the connection structure. Is a first embodiment of the present invention, FIGS. 6 and 7 show a second embodiment, in which 1 (1A, 1B) is a metal-resin composite tube, S is its connection structure, 2 is a main body, and 3 is a reinforcement The convex part, 4 shows an enlarged diameter part, and 5 shows a reduced diameter part.

  As shown in FIGS. 1 and 2, the metal resin composite pipe connection structure S of the present invention spirals a reinforcing convex portion 3 made of a metal member on the outer peripheral side of a synthetic resin main body portion 2 having a substantially flat inner surface. This is a structure in which two metal resin composite tubes 1A and 1B provided in a shape are connected to each other at their ends. In the present embodiment, the metal resin composite pipes 1A and 1B connected to each other have the same structure of the metal resin composite having the enlarged diameter portion 4 at one end and the reduced diameter portion 5 at the other end. Although it was set as the pipe | tube 1, the connection structure of this invention is not limited to this at all, and should just be provided with the diameter-expanded part and the diameter-reduced part at the ends which face each other, the other end part of one or both pipes Of course, it is not necessary to provide a reduced diameter part or an enlarged diameter part.

  As shown in FIGS. 1, 4, and 5, the metal resin composite pipe 1 (1 </ b> A, 1 </ b> B) according to the first embodiment is formed from a metal member on the outer peripheral side of the synthetic resin main body 2 having a substantially flat inner surface. As shown in FIGS. 2 and 3, the reinforcing convex portion 3 constituting the one end portion 10 is positioned inside the reinforcing convex portion 3 that is provided in a spiral shape. The enlarged diameter portion 4 is formed by applying pressure deformation outward together with the main body portion 2, and at least the reinforcing convex portion 3 constituting the other end portion 11 is inwardly provided at the other end portion 11. The reduced diameter portion 5 is formed by applying pressure deformation.

  The synthetic resin constituting the main body 2 is not particularly limited, such as a polyolefin resin, a polyvinyl chloride resin, and other general resins, but a polyethylene resin is preferably used. The main body 2 and the reinforcing projection 3 are formed on the partial molded body at the same time when the partial molded body of the main body 2 is melt-extruded, spirally wound on the rotating shaft, and sequentially welded, for example. The reinforcing projections 3 can also be efficiently produced by supplying them in a spiral and integrating them. In this example, a belt-shaped coated steel plate deformed into a mountain shape in cross section is supplied as a reinforcing convex portion 3 in a spiral shape and integrated on the main body portion 2. In addition to the coated steel plate, a steel plate inserted into a resin molded into the same shape may be used. Moreover, what inserted the metal rod-shaped body besides the steel plate is also preferable.

  The enlarged diameter portion 4 formed at the one end portion 10 can be easily configured by expanding and deforming the main body portion 2 and the reinforcing convex portion 3 to the outside, whereby the reinforcing convex portion 3 bulges outward. The deformed state is maintained, and the synthetic resin main body 2 integrated therein is also maintained in an expanded posture. The enlarged diameter portion 4 may be configured in a cylindrical shape having the same diameter in the axial direction, or is preferably configured in a trumpet shape that expands toward the opening end side. Further, the reduced diameter portion 5 formed on the other end portion 11 can be easily configured by pressurizing and deforming the other end portion 11 in the reduced diameter direction. In this example, only the reinforcing convex portion 3 is crushed. However, it is also possible to reduce the diameter of the main body 2 that has been further reduced in diameter.

  And in this embodiment, the cylindrical members 7 and 8 are the natural rubber, urethane rubber, butyl rubber, NBR, SBR, etc. various synthetic rubbers and water expansion materials on the inner surface of the enlarged diameter portion 4 and the outer diameter surface of the reduced diameter portion 5, respectively. It is watertightly attached using various sealing materials 9 such as various thermoplastic elastomers, foam materials such as polyurethane foam, silicone as a caulking agent, various liquid gaskets and non-vulcanized rubber. Although these cylindrical members 7 and 8 are not necessarily indispensable structures, the dimensions of the cylindrical members 7 and 8 are set in advance rather than sealing only between the inner surface of the main body portion of the enlarged diameter portion 4 and the reinforcing convex portion of the reduced diameter portion 5. Sealing via the cylindrical members 7 and 8 that can be determined with high accuracy can be expected to provide excellent sealing performance, and the connection work can be facilitated.

  In this example, the diameter-reduced portion 5 is formed in a taper shape that tapers toward the opening end, and the same tapered tubular member 8 is attached to the outer surface of the diameter-reduced portion 5. The cylindrical member 7 to be attached also has a taper shape of substantially the same angle substantially parallel to the cylindrical member 8, and an O-ring 60 is mounted as a sealing member 6 between the cylindrical members 7 and 8. And sealed. Such cylindrical members 7 and 8 are preferably made of metal such as an iron plate or synthetic resin.

  And in the case of a connection, among the metal resin composite pipes 1 provided with the said structure, the diameter reduction part of the 2nd metal resin composite pipe 1B with respect to the diameter expansion part 4 of the 1st metal resin composite pipe 1A. It is possible to complete the connection with one touch only by inserting 5. Although the O-ring 60 (seal member 6) may be attached at the time of connection, for example, as shown in FIG. Further, the O-ring 60 (seal member 6) may be mounted in advance in a state of being fitted into the cylindrical member 7 of the enlarged diameter portion 4 as shown in FIG. 3, for example. When the O-ring 60 is attached to the cylindrical member 7 of the enlarged diameter portion 4, it is preferable that the O-ring 60 is fixed to the cylindrical member 7 with an adhesive or the like. In addition, as long as the shape, structure, and mounting position of the seal member 6 such as the O-ring 60 can reliably seal between the cylindrical member 7 of the enlarged diameter portion 4 and the cylindrical member 8 of the reduced diameter portion 5, There is no particular limitation, and seal members of various shapes and structures can be mounted at appropriate positions.

  FIG. 6 shows the connection structure S of the metal resin composite tube according to the second embodiment. In this example, the tip of the enlarged diameter portion 4 and the inner surface of the enlarged diameter portion 4 of the first metal resin composite tube 1A are shown. A first end stopper ring 72 is mounted so that the tip of the attached cylindrical member 7 is aligned and the both ends are sandwiched. Similarly, the tip of the reduced diameter portion 5 of the second metal-resin composite pipe 1B and the tip of the cylindrical member 8 attached to the outer surface of the reduced diameter portion 5 are aligned, and both ends are sandwiched. A second end retaining ring 82 is attached to the front end.

  In addition, the proximal end side of the cylindrical member 8 attached to the outer surface of the reduced diameter portion 5 of the second metal resin composite tube 1B is a tube on the inner surface of the enlarged diameter portion 4 in a state where it is joined to the first metal resin composite tube 1A. Since it is located outside the tip of the shaped member 7, a sealing ring 83 for sealing between the end on the base end side and the outer surface of the second metal resin composite tube 1B is further covered. These first end retaining ring 72, second end retaining ring 82, and sealing ring 83 are made of, for example, natural or synthetic rubber, soft synthetic resin, elastomer, etc., as shown in the exploded view of FIG. In addition, the first end retaining ring 72 may be attached after the tubular member 7 is attached, and the second end retaining ring 82 and the sealing ring 83 are attached to the tubular member 8 and the O-ring 60. After mounting, the second end retaining ring 82 and the sealing ring 83 may be mounted in this order. These rings can prevent the intrusion of rainwater and the like from the outside and the leakage of the circulating fluid from the inside and improve the appearance.

  The cylindrical members 7 and 8 of this embodiment are formed of a synthetic resin, and one cylindrical member 7 has a helical rib on the outer peripheral surface facing the enlarged diameter portion 4 of the tapered cylindrical main body 70. 71 is provided, and the other cylindrical member 8 is also provided with a spiral rib 81 on the inner peripheral surface of the tapered cylindrical body 80 facing the reduced diameter portion 5. In this case, the side sealed by the O-ring 60 is kept flat, and ribs are formed on the outer peripheral surface or the inner peripheral surface which does not affect the sealing performance. These ribs 71 and 81 both reinforce the cylinder main bodies 70 and 80 to prevent bending, and at the same time, the ribs 71 and 81 are provided on the sealing material 9 filled between the enlarged diameter portion 4 or the reduced diameter portion 5. By biting in, the effect of preventing the cylindrical members 7 and 8 from coming off is also achieved.

The ribs 71 and 81 may be formed by forming a plurality of annular ribs at predetermined intervals instead of being configured in a spiral shape. Such ribs 71 and 81 can be configured by being integrally formed with the cylinder main bodies 70 and 80 by injection molding or spiral extrusion molding. You may comprise so that the shape | molded rib 71 may be wound and joined. The cross-sectional shape of the ribs 71 and 81 may be substantially triangular or quadrangular in addition to the semicircular shape. You may comprise as. Further, the form of the rib is not limited to a spiral or a ring, and other forms may be used. Of course, a structure provided with a reinforcing means other than the rib or a structure without a reinforcing means is possible.
Since other configurations are basically the same as those in the first embodiment, the same reference numerals are given to the same structures, and descriptions thereof are omitted.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

Explanatory drawing which shows the whole structure of the connection structure of the metal resin composite pipe | tube which concerns on 1st Embodiment of this invention. The longitudinal cross-sectional view which shows the principal part of a connection structure similarly. Similarly, the longitudinal cross-sectional view which shows the principal part of other embodiment of a connection structure. Explanatory drawing which shows the whole structure of the metal resin composite pipe | tube similarly used for a connection structure. The longitudinal cross-sectional view of a metal resin composite pipe | tube similarly. The longitudinal cross-sectional view of the connection structure of the metal resin composite pipe | tube which concerns on 2nd Embodiment of this invention. The components exploded view of connection structure.

Explanation of symbols

S connection structure 1, 1A, 1B metal resin composite pipe 2 body part 3 reinforcing convex part 4 enlarged diameter part 5 reduced diameter part 6 sealing member 7 cylindrical member 8 cylindrical member 9 sealing material 10, 11 end 60 O-ring 70 , 80 Tube body 71, 81 Rib 72, 82 End retaining ring 83 Seal ring

Claims (20)

  With a connection structure that connects two metal resin composite pipes that are constructed by spirally providing reinforcing projections made of metal members on the outer peripheral side of a synthetic resin main body with a substantially flat inner surface. Then, at the facing end of the first metal-resin composite tube, the reinforcing convex portion constituting the end is pressed and deformed outward together with the main body located on the inside thereof. A reduced diameter portion is formed by pressurizing and deforming at least the reinforcing convex portion constituting the end portion at the facing end portion of the second metal resin composite tube. The reduced diameter portion of the second metal resin composite tube is inserted into the enlarged diameter portion of the first metal resin composite tube, and sealed in the gap between the inner diameter side of the enlarged diameter portion and the outer surface side of the reduced diameter portion. A metal-resin composite pipe connection structure characterized by comprising a member.   The metal resin composite tube connection structure according to claim 1, wherein the reduced diameter portion is formed by crushing a reinforcing convex portion constituting an end portion of the second metal resin composite tube.   The tubular member according to claim 1 or 2, wherein a cylindrical member is watertightly attached to the inner surface of the enlarged diameter portion and the outer surface of the reduced diameter portion, respectively, and a seal member is interposed in a gap between the tubular members in the inserted state. Metal resin composite tube connection structure.   A first end retaining ring that clamps the distal end of the enlarged diameter portion and the distal end of the cylindrical member attached to the inner surface thereof is provided, and a second end that sandwiches the distal end of the reduced diameter portion and the distal end of the cylindrical member attached to the outer surface thereof. The metal resin composite pipe connection structure according to claim 3, further comprising a part retaining ring.   The metal resin according to claim 3 or 4, wherein a sealing ring that seals a space between the outer surface of the second metal resin composite tube is provided on the base end side of the cylindrical member attached to the outer surface of the reduced diameter portion. Composite pipe connection structure.   The metal resin composite tube connection structure according to any one of claims 3 to 5, wherein the cylindrical member is formed of a synthetic resin member having a spiral or annular rib.   The reduced diameter portion is formed in a tapered shape that tapers toward an opening end, and a tapered tubular member is similarly attached to the outer surface of the reduced diameter portion. Metal resin composite tube connection structure.   The connection of the metal resin composite pipe | tube of Claim 7 comprised so that the cylindrical member attached to the said enlarged diameter part inner surface may become a taper shape so that it may become substantially parallel to the tapered cylindrical member attached to the said reduced diameter part outer surface. Construction.   9. A cylindrical member attached to the outer surface of the reduced diameter portion and a ring-shaped seal member mounted on the outer surface of the cylindrical member, and the reduced diameter portion is inserted into a cylindrical member attached to the inner surface of the enlarged diameter portion. The connection structure of the metal resin composite pipe according to any one of the above.   A cylindrical member attached to the outer surface of the reduced diameter portion is inserted into the enlarged diameter portion in a state where a ring-shaped seal member is housed in the cylindrical member attached to the inner surface of the enlarged diameter portion. The connection structure of the metal resin composite pipe according to any one of the above.   It is a metal resin composite pipe used for the connection structure according to any one of claims 1 to 10, wherein a reinforcing convex portion made of a metal member is provided on an outer peripheral side of a synthetic resin main body portion whose inner surface is substantially flat. It is configured to be spirally formed, and at one end portion, the reinforcing convex portion constituting the one end portion is pressed and deformed outward together with the main body portion located on the inside thereof, thereby forming an enlarged diameter portion, A metal-resin composite pipe, wherein the other end portion is formed with a reduced diameter portion by pressurizing and deforming at least the reinforcing convex portion constituting the other end portion inward.   The metal resin composite pipe according to claim 11, wherein the reduced diameter portion formed at the other end portion crushes the reinforcing convex portion constituting the other end portion.   The metal resin composite pipe according to claim 11 or 12, wherein a cylindrical member is watertightly attached to the inner surface of the enlarged diameter portion and the outer surface of the reduced diameter portion.   A first end retaining ring that clamps the distal end of the enlarged diameter portion and the distal end of the cylindrical member attached to the inner surface thereof is provided, and a second end that sandwiches the distal end of the reduced diameter portion and the distal end of the cylindrical member attached to the outer surface thereof. The metal resin composite pipe according to claim 13, further comprising a part retaining ring.   The metal resin according to claim 13 or 14, wherein a sealing ring that seals a space between the outer surface of the second metal resin composite tube is provided on the base end side of the cylindrical member attached to the outer surface of the reduced diameter portion. Composite tube.   The metal resin composite pipe according to any one of claims 13 to 15, wherein the cylindrical member is formed of a synthetic resin member provided with a spiral or annular rib.   The reduced diameter portion is formed in a tapered shape that tapers toward an opening end, and a tapered tubular member is similarly attached to the outer surface of the reduced diameter portion. Metal resin composite tube.   The metal-resin composite pipe according to claim 17, wherein the cylindrical member attached to the inner surface of the enlarged diameter portion is configured to be tapered so as to be substantially parallel to the tapered cylindrical member attached to the outer surface of the reduced diameter portion.   The metal-resin composite pipe according to any one of claims 13 to 18, wherein a ring-shaped seal member is sheathed on a cylindrical member attached to the outer surface of the reduced diameter portion.   The metal-resin composite pipe according to any one of claims 13 to 18, wherein a ring-shaped seal member is internally provided on a cylindrical member attached to the inner surface of the enlarged diameter portion.

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