JP2011163524A - Pipe connecting structure and pipe connecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe connecting structure or the like, which is lightweight and excellent in setting workability, can secure sufficient pressure resistance in a joint part even in transportation of high-pressure fluid, and never causes a problem such as scratch on the periphery of a pipe. <P>SOLUTION: A resin short pipe 13 is joined to an end opposite to a connection with a pipe 5 of a connection fixing short pipe 9. The end opposite to the joint with the connection fixing short pipe 9 of the resin short pipe 13 is inserted to an electric fusing socket 11. A flange portion 15 is provided as a fixing tool 8 between a pair of protruding portions 21 provided on the outer periphery of the connection fixing short pipe 9. A pair of flange portions 15 formed to sandwich the electric fusing socket 9 includes a coupling rod 17 mutually connecting the both. The flange portions 15 are never separated from each other by a predetermined distance or more since the coupling rod 17 mutually connects the flange portions 15. Namely, the flange portions 15 are regulated in displacement in the axial direction of the pipe 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a connection structure and connection method for piping for water supply and distribution used for water and sewage piping, tunnel fire extinguishing piping, fire extinguishing piping, factory piping, snow melting piping, and the like.

  Conventionally, resin piping is used for piping for water transmission and distribution. The resin pipe is lighter than, for example, a steel pipe, and a long pipe can be used, so that the number of connecting portions can be reduced.

  As a method for connecting the resin pipes, there is a butt fusion method in which both ends of the resin pipes are heated by a heater and a pressure is applied. Although butt fusion does not use a joint, it is excellent in cost. However, the butt fusion equipment becomes large, and there is a case where the work space is limited.

  Another simple method for connecting resin pipes is to use an electric fusion socket (joint). By inserting the end portion of the resin pipe into the electric fusion socket from both sides and passing an electric current through the electric fusion socket, the resin pipe can be reliably connected without requiring skill or the like.

  On the other hand, when a high-pressure fluid is allowed to flow inside the resin pipe, not only the resin pipe but also the pressure resistance of the connection portion is required. In particular, when an electric fusion socket is used, stress is generated in the radial direction and the axial direction of the electric fusion socket. For this reason, a connection structure that can withstand the pressure of the internal high-pressure fluid is required.

  Such a resin pipe connection structure is a connection structure using electric fusion, in which a lock ring is fitted to the outside of both ends of the joint pipe, and the outer diameter of the lock ring increases as the distance from the joint pipe increases. There is a joint structure in which a tapered surface that becomes smaller is formed, and an annular flange is fitted to the outer periphery of the lock ring so as to abut the inner tapered surface (Patent Document 1).

JP 2007-40443 A

  However, in such a joint structure, when a force that causes the pipe to extend in the axial direction of the joint is generated, the lock ring narrows the outer periphery of the pipe. For this reason, there is a problem in reliability when piping is used for a long time.

  The present invention has been made in view of such problems, and is lightweight and excellent in installation workability. Even when a high-pressure fluid is transported, sufficient pressure resistance is ensured in the joint portion, and the outer periphery of the pipe is damaged. An object of the present invention is to provide a pipe connection structure that does not cause the above problem.

  In order to achieve the above-mentioned object, the first invention is a pipe connection structure, which is a resin pipe, a connection part fixing short tube provided at an end part of the resin pipe, and an end part of the connection part fixing short pipe. The resin pipe and the connecting portion fixing short tube, and the connecting portion fixing short tube and the electric fusion socket are each fusion bonded, and at least the The outer periphery of the resin pipe and the electric fusion socket is provided with a reinforcing layer that suppresses the expansion of the connection portion in the radial direction, and is fixed to the electric fusion socket by a fixing jig provided on the connection portion fixing short tube. The connecting portion fixing short pipe is fixed in the axial direction.

  Here, the electric fusion socket into which the end of the connecting portion fixing short tube is inserted is not only the end portion of the connecting portion fixing short tube itself, but also a tube joined and integrated with the connecting portion fixing short tube. It also includes the end of the body.

  A pair of resin pipes face each other, and the connection part fixing short pipes are provided at the ends of the respective resin pipes facing each other, and the ends of the facing connection part fixing short pipes are inserted into the electric fusion socket. The connecting portion fixing short tubes may be coupled to each other across the electric fusion socket by a fixing jig.

  At least one peak portion projecting in the radial direction is provided on the outer peripheral portion of the connection portion fixing short tube, and the fixing jig has an axial movement of the connection portion fixing short tube by the mountain portion. You may have a flange part controlled and the connecting rod which connects each said flange part which straddles across the said fusion | melting socket. Here, it is preferable to provide a pair of ridges in parallel in the axial direction and to sandwich the flange portion between the ridges.

  At least a pair of ridges projecting in the radial direction is provided on the outer peripheral portion of the connection portion fixing short tube, and the flange portion is provided between the pair of mountain portions, and the shaft of the connection portion fixing short tube Directional movement may be regulated.

The end of the resin short tube joined to the end of the connecting portion fixing short tube is connected to the end of the connecting portion fixing short tube opposite to the side to be bonded to the resin pipe. Instead of fusing the connecting portion fixing short tube and the electric fusion socket, the resin short tube and the electric fusion socket may be fusion bonded.

  The resin pipe is made of polyethylene, the connecting portion fixing short pipe is high density polyethylene classified as PE100 in the extrapolation method defined in ISO TR 9080 and the classification table defined in ISO 12162, and the reinforcing layer is made of poly Although it may be formed of arylate fibers, other materials may be used for the resin pipe as long as the resin pipe has the same strength as polyethylene. Moreover, an aramid fiber can be used instead of the polyarylate fiber.

  According to the first invention, the connecting portion fixing short tube is provided at the end of the resin pipe, and the displacement of the connecting portion fixing short tube in the axial direction is regulated by the fixing jig provided on the connecting portion fixing short tube. Thereby, the expansion | extension to the axial direction accompanying the internal pressure in a connection part can be suppressed. Moreover, with respect to the radial direction, the expansion in the radial direction of the connecting portion can be suppressed by providing a reinforcing layer at least on the outer peripheral portion of the resin pipe and the electric fusion socket.

  Also, by connecting the connecting portion fixing short tubes arranged at both ends of the electric fusion socket with a fixing jig, the distance between the connecting portion fixing short tubes can be kept constant, and the axial direction can be reduced. Movement can be regulated.

  In addition, a ridge that protrudes in the radial direction is formed on the outer peripheral part of the connecting portion fixing short tube, and the axial movement of the flange portion is regulated by the ridge portion, and the flange portions on both sides of the electrofusion socket are connected to each other. By doing so, the movement of the connecting portion fixing short pipe in the axial direction can be restricted. By providing a pair of peak portions in parallel in the axial direction and sandwiching the flange portion between the peak portions, the operation of the flange portion can be reliably regulated with respect to the axial direction of the connecting portion fixing short tube.

  Further, by connecting a resin short tube to the end portion of the connecting portion fixing short tube, the joint portion with the electric fusion socket can be made into a resin short tube, so that the connection fixing short tube can be made small. .

  Further, if the resin pipe is made of polyethylene, and the extrapolation method specified in ISO TR 9080 and the high density polyethylene classified as PE100 in the classification table specified in ISO 12162 are used as the connection part fixing short pipe, the connection part fixing short pipe The strength of itself can be sufficiently secured, and if a reinforcing tape made of polyarylate fiber is used as the reinforcing layer, the strength in the radial direction of the resin pipe and the electric fusion socket can be sufficiently secured.

According to a second aspect of the present invention, a connecting portion fixing short tube is joined to an end portion of a resin pipe having a reinforcing layer on the outer periphery by butt fusion bonding, and the connecting portion fixing short tube is provided at an end portion after laying the resin pipe. The resin pipes are made to face each other, and the ends of the connecting portion fixing short tubes facing each other are inserted into an electric fusion socket having a reinforcing layer on the outer periphery, and the connecting portion fixing short tubes are opposed to each other. Bonding with a socket, a fixing jig is provided on each of the connecting portion fixing short tubes, and the connecting portion fixing short tubes are connected to each other across the electric fusion socket by the fixing jig. This is a pipe connection method.
By using this connection method, the axial and radial stress acting on the pipe connection part is controlled to suppress displacement such as axial expansion and contraction of the pipe, and further provided on the outer periphery of the electric fusion socket. Further, the radial deformation of the connecting portion can be suppressed by the reinforcing layer.

  According to the second aspect of the present invention, it is possible to easily construct a connection structure that is easy to lay pipes and has strength that can withstand high-pressure fluid. For this reason, each resin pipe can be formed by butt fusion in a place where the work space is sufficient, and after each resin pipe is laid at the laying position, the pipe can be securely connected using the electric fusion socket.

  According to the present invention, it is lightweight and excellent in installation workability, and even when a high-pressure fluid is transported, it ensures sufficient pressure resistance in the joint portion, and does not cause problems such as damage to the outer periphery of the pipe. Structure etc. can be provided.

The figure which shows the piping structure 1. FIG. It is the A section enlarged view of FIG. 1, (a) is an enlarged view which shows the connection part 7, (b) is sectional drawing of the axial direction of (a). The BB sectional view taken on the line of Fig.2 (a). The CC sectional view taken on the line of Fig.2 (a). The DD sectional view taken on the line of Fig.2 (a). The figure which shows a piping laying process. The figure which shows the connection process of piping. The figure which shows the connection process of piping. The figure which shows the connection structure of other embodiment. The figure which shows the connection structure of other embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an elevation view showing an example of a piping structure 1. The pipe structure 1 is constructed by connecting a plurality of resin pipes 5 used for water transmission and distribution at predetermined sites.

  In the example shown in FIG. 1, the pipe structure 1 is a water supply pipe laid along the bridge 3. The pipe 5 is manufactured in advance at a predetermined length in a factory, and a plurality of pipes 5 are connected and used by the connection portion 7 when laying. The piping structure of the present invention is not limited to the water supply piping used for the bridge 3, but water and sewage piping and fire extinguishing piping arranged under the road and beside the railway, tunnel fire extinguishing piping arranged in the tunnel, and factory piping. Needless to say, the present invention can be applied to various forms as long as the pipe flows a fluid containing a liquid such as water or a gas. In the following description, a case where the piping structure is laid on the bridge 3 will be described.

  2A and 2B are diagrams showing an A portion of FIG. 1, FIG. 2A is an enlarged view of the connection portion 7, and FIG. 2B is a cross-sectional view of the connection portion 7 in the axial direction. As shown in FIG. 2A, the connection portion 7 is mainly composed of a connection portion fixing short tube 9, a resin short tube 13, an electric fusion socket 11, a fixing jig 8, and the like.

  The pipe 5 is made of, for example, polyethylene. A connecting portion fixing short tube 9 is connected to each end portion of the pair of pipes 5 provided to face each other. The pipe 5 and the connecting portion fixing short tube 9 are connected by, for example, butt fusion. The connecting portion fixing short tube 9 is preferably a high-density polyethylene classified as PE100 in the extrapolation method defined in ISO TR 9080 and the classification table defined in ISO 12162.

  The connecting portion fixing short tube 9 is formed by injection molding, cutting out from a resin block, or the like. The connecting portion fixing short tube 9 is a tubular body having an inner diameter corresponding to the inner diameter of the pipe 5, and has a ridge portion 21 projecting radially in the outer peripheral portion. A pair of ridges 21 are formed in parallel in the axial direction of the connecting portion fixing short tube 9 (the axial direction of the pipe 5).

  A resin short tube 13 is joined to the end of the connecting portion fixed short tube 9 opposite to the connecting portion with the pipe 5. The joint between the connecting portion fixing short tube 9 and the resin short tube 13 is connected by, for example, butt fusion. The resin short pipe 13 is, for example, a polyethylene pipe having the same cross section as that of the pipe 5, and is a short pipe having a length slightly longer than an insertion allowance into an electric fusion socket described later. In addition, if the end part of the connection part fixed short tube 9 is extended and formed, and the shape of the end part of the connection part fixed short pipe 9 is made into the shape integrated with the resin short tube 13, the resin short tube 13 is necessarily required. is not.

  The end portion of the resin short tube 13 opposite to the joint portion with the connecting portion fixing short tube 9 is inserted into the electric fusion socket 11. That is, the end of the resin short tube 13 is inserted from both sides of the electrofusion socket 11. When the connecting portion fixing short tube 9 is integrally formed without using the resin short tube 13, the end of the connecting portion fixing short tube 9 opposite to the connecting portion with the pipe 5 is electrically fused. It is inserted directly into the socket 11. In the following description, the case where the resin short tube 13 is used will be described.

  The electric fusion socket 11 is a so-called EF joint (Electro Fusion joint), and heat is generated by energizing a heating wire embedded in the electric joint, and an interface between the electric fusion socket 11 and the inserted resin short tube 13 is formed. It is melted, integrated and joined. That is, the end of the resin short tube 13 and the electric fusion socket 11 are connected by electric fusion. Note that the terminals, wiring, power supply, etc. of the electric fusion socket 11 are not shown.

  A flange portion 15 is provided as a fixing jig 8 between a pair of mountain portions 21 provided on the outer periphery of the connecting portion fixing short tube 9. As shown in FIG. 2 (b), the flange portion 15 has a notch (hole) formed at the center, and is formed on the outer periphery of the connecting portion fixing short tube 9 so as to be sandwiched between the pair of mountain portions 21. Is done. In other words, the flanges 15 are formed so as to face the respective connecting portion fixing short tubes 9 provided on both sides of the electric fusion socket 11. The flange portion 15 has an outer diameter larger than that of the peak portion 21.

  A pair of flange portions 15 formed so as to sandwich the electric fusion socket 9 are provided with connecting rods 17 that connect each other. The connecting rod 17 which is a part of the fixing jig 8 connects the flange portions 15 to each other, and the flange portions 15 are not separated from each other by a predetermined distance or more. That is, the flange portion 15 is restricted from displacement in the axial direction of the pipe 5.

FIG. 3 is a cross-sectional view taken along line BB in FIG. As shown in FIG. 3, the flange portion 15 is composed of a pair of halved members. As described above, a semicircular cutout is formed in a part of the half member so as to fit on the outer periphery of the connecting portion fixing short tube 9 (the outer peripheral portion between the mountain portions 21). The semi-circular half member is joined by, for example, bolts or the like by the joint portions 23 at both ends, thereby forming a ring-shaped flange portion 15.
In addition, although the half member formed separately was set as the structure fixed to a connection part fixed short tube, a flange can also be integrally molded to a connection part fixed short tube. In this case, it goes without saying that the flange is integrally formed in a ring shape between the pair of convex portions.

  A pair of connecting rods 17 are formed at positions where the flange portion 15 faces. Both ends of the connecting rod 17 have a male thread shape, and are fixed to the flange 15 with, for example, a nut or the like. The arrangement and number of connecting rods 17, the structure of the joining portion 23, the joining method of the connecting rod 17 and the flange portion 15, etc. are not limited to the illustrated example. For example, three or more connecting rods 17 may be formed at equal intervals in the circumferential direction, and welding or the like can be applied to each joint.

  FIG. 4 is a cross-sectional view taken along the line CC of FIG. As shown in FIG. 4, a reinforcing layer 19 is provided on the outer periphery of the pipe 5. For example, a tape of polyarylate fiber is wound around the reinforcing layer 19. As the reinforcing layer 19, for example, Vectran (registered trademark) manufactured by Kuraray Co., Ltd., which is a super fiber tape, can be used. The polyarylate fiber tape may be wound, for example, by wrapping ends in the tape width direction, or may be wound with a slight gap. Further, the reinforcing layer 19 may be formed by winding a plurality of times, such as winding a polyarylate fiber tape in a forward and reverse manner. The winding method of the polyarylate fiber tape is appropriately determined according to the strength of the polyarylate fiber tape and the required internal pressure resistance.

  FIG. 5 is a cross-sectional view taken along the line DD of FIG. As shown in FIG. 5, a reinforcing layer 19 is also provided on the outer periphery of the electric fusion socket 11. Further, as shown in FIG. 2A, the reinforcing layer 19 is similarly formed on the exposed portion of the resin short tube 13 that is not inserted into the electric fusion socket 11. In addition, the reinforcement layer 19 is not provided in the site | part inserted in the electrofusion socket 11 of the resin short tube 13. FIG.

  The reinforcing layer 19 is for improving the internal pressure resistance in order to prevent deformation or breakage of the pipe or the like in the radial direction when a high-pressure fluid flows through the pipe. By providing the reinforcing layer 19, the internal pressure resistance of the pipe 5, the resin short pipe 13, and the electric fusion socket 11 can be improved, and it can be applied to a high-pressure fluid. In addition, although illustration is abbreviate | omitted, you may wind a waterproofing tape, a protective tape, etc. around the outer periphery of the reinforcement layer 19 further. If the connecting portion fixing short tube 9 has sufficient strength, it is not necessary to provide the reinforcing layer 19, but the reinforcing layer 19 may also be formed on the outer periphery of the connecting portion fixing short tube 9.

  Next, a piping structure laying method (piping connection method) will be described. FIG. 6 is a diagram illustrating a process of laying the pipe 5 on the bridge 3. When laying the pipe 5 at a long distance, it is necessary to lay it while connecting the pipe 5. However, as described above, in the method using butt fusion, the equipment used is large, and it is difficult to connect the pipes in a narrow part while moving. Also, laying the pipe while connecting the pipes by butt fusion in a predetermined work area increases the weight of the pipe and makes it difficult to move the pipe itself.

  Accordingly, in the present invention, a butt fusion machine is arranged in the work area E in FIG. 6, and several to several tens of pipes are connected so that the pipe can be moved in the work area E. The connecting portion fixing short tube 9 and the resin short tube 13 are fused to the end of the pipe 5 or the pipes are not connected to each other, and only the connecting portion fixing short tube 9 and the resin short tube 13 are connected to the end of the pipe 5. Fuse. First, the pipe 5 in which the connecting portion fixing short tube 9 and the resin short tube 13 are connected to the front (left side in the drawing) end is moved toward the laying direction (the direction of arrow F in the drawing). At this time, the number of pipes 5 is set to a weight that allows movement.

  Similarly, only the connecting portion fixing short tube 9 and the resin short tube 13 are fused to the rear end portion of the pipe 5 moved to the front side. By repeating the above, the pipes 5 each having the connecting portion fixing short tube 9 and the resin short tube 13 joined to the front and rear ends thereof are moved to the respective laying positions and arranged. The piping 5 is provided with a reinforcing layer 19 in advance.

  Next, the pipes 5 arranged at predetermined positions are connected to each other. First, as shown to Fig.7 (a), the edge part of a pair of resin short tube 13 which opposes is inserted in the electrofusion socket 11 (arrow G direction in the figure). With the short resin tube 13 inserted from both sides of the electric fusion socket 11 (FIG. 7B), the electric fusion socket 11 is energized to fuse the electric fusion socket 11 and the short resin tube 13 together. To do. At this time, it is not necessary for the ends of the short resin tube 13 to completely contact with each other inside the electric fusion socket 11.

  Next, as shown in FIG. 8A, a reinforcing layer 19 is formed on the outer periphery of the resin short tube 13 and the electric fusion socket 11 exposed to the outside, and the flange portion 15 is fixed to the connecting portion fixing short tube 9. . As described above, the flange portion 15 is formed by sandwiching a half-divided member from both sides of the connecting portion fixing short tube 9 (in the direction of arrow H in the figure) and integrating by the joint portion 23. The thickness of the flange portion 15 is substantially the same or slightly thinner than the interval between the peak portions 21. For this reason, the flange portion 15 is restricted from moving in the axial direction with respect to the connecting portion fixing short tube 9.

  Next, as shown in FIG. 8B, the pair of flange portions 15 are connected by the connecting rod 17. A change in distance between the flange portions 15 is restricted by the connecting rod 17. That is, it is possible to keep the distance between the flange portions 15 substantially constant against the force (or the force to reduce the distance) between the flange portions 15. For this reason, the deformation | transformation and damage of the axial direction in the electrofusion socket 11 can be prevented.

  As described above, according to the connection portion 7 and the like of the present embodiment, a piping structure that is excellent in laying workability and can be applied to a high-pressure fluid can be obtained. In particular, since pipe connection by butt fusion is not performed in laying pipes over long distances or working in confined spaces, connection workability is excellent.

  In the connecting portion, the reinforcing layer 19 is formed on the outer periphery of the resin short tube 13 and the electric fusion socket 11, so that the deformation and breakage in the radial direction can be prevented even when the high-pressure fluid is used. . In addition, since the connection part fixed short tube 9 uses a high-strength member such as PE100 and reinforces it in the radial direction, a reinforcing layer such as an arylate fiber may be provided similarly to the resin pipe 13.

  In addition, since the flange portions 15, which are fixing jigs, provided on the connecting portion fixing short tube 9 are connected by the connecting rod 17 so as to straddle the electric fusion socket 11, the distance between the flange portions 15 is constant. Kept. Further, since the displacement of the flange portion 15 and the connecting portion fixing short tube 9 is restricted with respect to the axial direction, the connecting rod 17 can prevent deformation and breakage of the electric fusion socket 11 in the axial direction. it can.

  That is, even when a high-pressure fluid is present inside, the connecting portion 7 has excellent internal pressure resistance in the radial direction and the axial direction, and therefore it is possible to prevent breakage or leakage of the connecting portion. Further, the connection work is simple and there is no need to use special equipment such as butt fusion. Furthermore, since the piping and the like are not damaged at the connection portion, a highly reliable piping structure can be provided.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, as shown in FIG. 9, at the end of the piping structure, the existing piping or the like and the laid resin piping 5 are connected. In this case, the existing flanged pipe 29 is fixed to the structure or the like and does not move in the axial direction. In particular, when polyethylene pipes are used for piping for water sprinkling and snow melting equipment on the road, if the pipes are expanded or contracted in the longitudinal direction, the angle of the watering nozzle may change. It is desirable to fix such axial movement. In such an example, the flange portion 15 (or a member having the same function as the fixing jig) is joined to the connecting portion fixing short tube 9 without using the connecting rod 17 as a fixing aging tool, and the flange portion What is necessary is just to fix 15 to the fixing | fixed part 25 (structure, the ground, etc.). In FIG. 9, one side of the flange portion 15 is fixed, but it is preferable to fix both sides of the flange portion 15. In FIG. 9, the flange portion 15 is provided on one side of the electric fusion socket, but it may be provided on both sides.

  In addition, on the existing pipe side, the flanged resin short tube 27 is inserted into the electric fusion socket 11 and joined, and the flanged resin short tube 27 and the flanged tube 29 are joined by the flange. At this time, the reinforcing layer 19 is provided on the outer periphery of the flanged resin short tube 27 as required.

  As described above, the movement of the connecting portion fixing short tube 9 in the axial direction is restricted by fixing the flange portion 15 (connecting portion fixing short tube 9) and the fixing portion 25 on one side of the electric fusion socket 11. In addition, since the position of the existing pipe (the flanged pipe 29) fixed by other means is fixed on the other side, it is possible to prevent deformation or breakage of the electric fusion socket 11 in the axial direction. it can.

  Further, as shown in FIG. 10, with the peak portion 21 of the connecting portion fixing short tube 9 as one place, both ends of the peak portion 21 in the connected state (direction opposite to the electrofusion socket 11 side). You may form the flange part 15 so that the outer surface side of the peak part 21 may be contacted. Although not shown in the figure, with the crest 21 of the connecting portion fixing short tube 9 as one place, the crests are connected to both inner sides of the crest 21 in the connected state (the direction toward the electrofusion socket 11 with respect to the crest). You may form the flange part 15 so that the inner surface side of 21 may be contacted. Here, whether the flange portion 15 is provided on the outer side or the inner side of the mountain portion may be appropriately selected according to the use environment of the setting place of the pipe connection portion. When receiving the tension from the flange portion 15, the flange portion 15 is provided on both outer sides of the peak portion, and when the electric fusion socket 11 receives the compressive force from the pipe, it may be provided on both inner sides. In this way, deformation of the joint portion due to shrinkage or elongation of the resin piping can be suppressed.

DESCRIPTION OF SYMBOLS 1 ......... Piping structure 3 ......... Bridge 5 ......... Pipe 7 ......... Connection part 8 ......... Fixing jig 9 ......... Connection part fixed short pipe 11 ......... Electric fusion socket 13 ......... Resin short pipe 15 ......... Flange part 17 ......... Connecting rod 19 ......... Reinforcing layer 21 ......... Mount part 23 ......... Joint part 25 ......... Fixed part 27 ......... Flanged resin short pipe 29 ... ... Flanged piping

Claims (7)

A pipe connection structure,
Resin piping,
A connecting portion fixing short pipe provided at an end of the resin pipe;
An electric fusion socket into which an end of the connecting portion fixing short tube is inserted; and
Comprising
The resin pipe and the connecting portion fixing short tube, and the connecting portion fixing short tube and the electric fusion socket are fusion bonded, respectively.
A reinforcement layer that suppresses expansion in the radial direction of the connecting portion is provided at least on the outer peripheral portion of the resin pipe and the electric fusion socket,
A pipe connection structure, wherein the connection portion fixing short tube is fixed in an axial direction with respect to the electric fusion socket by a fixing jig provided on the connection portion fixing short tube. A pair of resin pipes face each other, and the connection part fixing short pipes are provided at the ends of the respective resin pipes facing each other, and the ends of the facing connection part fixing short pipes are inserted into the electric fusion socket. Fused,
The pipe connection structure according to claim 1, wherein the connecting portion fixing short tubes are connected to each other across the electric fusion socket by a fixing jig. On the outer peripheral portion of the connecting portion fixing short tube, at least one peak portion protruding in the radial direction is provided,
The fixing jig includes a flange portion in which movement of the connecting portion fixing short pipe in the axial direction is restricted by the mountain portion;
The pipe connection structure according to claim 2, further comprising a connecting rod that connects the flange portions facing each other across the fusion socket. On the outer peripheral portion of the connecting portion fixing short tube, at least a pair of ridges protruding in the radial direction is provided,
The pipe connection structure according to claim 3, wherein the flange portion is provided between the pair of mountain portions and the movement of the connecting portion fixing short pipe in the axial direction is restricted. The end of the resin short tube joined to the end of the connecting portion fixing short tube is connected to the end of the connecting portion fixing short tube opposite to the side to be bonded to the resin pipe. A portion is inserted into the electric fusion socket, and the resin short tube and the electric fusion socket are fusion-bonded instead of fusing the connection portion fixing short tube and the electric fusion socket. The pipe connection structure according to any one of claims 1 to 4.   The resin pipe is made of polyethylene, the connecting portion fixing short pipe is high density polyethylene classified as PE100 in the extrapolation method defined in ISO TR 9080 and the classification table defined in ISO 12162, and the reinforcing layer is made of poly The pipe connection structure according to any one of claims 1 to 5, wherein the pipe connection structure is formed of arylate fibers. Join the connecting portion fixing short pipe to the end of the resin pipe having a reinforcing layer on the outer periphery by butt fusion bonding,
After laying the resin piping, the resin piping having the connecting portion fixing short tube provided at the ends thereof are opposed to each other, and an end portion of the facing connecting portion fixing short tube is provided with a reinforcing layer on the outer periphery. Inserted into, and joined the connecting portion fixing short tubes to each other by the electric fusion socket,
A fixing jig is provided for each of the connecting portion fixing short tubes,
The pipe connection method characterized in that the connection fixture fixing short tubes are connected to each other across the electric fusion socket by the fixing jig.

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