JP2004225837A - Piping joint method and flexible pipe joint used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materializes compaction in a pipe axial direction of a flexible connection structure constituted between fixing piping and connecting pipe, reduction in manufacturing cost and improvement in construction efficiency. <P>SOLUTION: Inside a socket pipe 5 which can be fixed and connected to an end of fixing piping 1 fixed on a structure A, ground or the like, a thermoplastic resin made partially spherical ring 6 equipped with the partially spherical outer peripheral surface 6a freely slidable along the partially spherical inner peripheral surface 5a formed in the socket pipe is mounted from the direction of the pipe axial center X in a coming-off prevention state. A connecting pipe 2 made of thermoplastic resin is connected to be internally fitted in a through hole 6A of the partially spherical ring 6 from the direction of the pipe axial center X. The partially spherical ring 6 and the connecting pipe 2 are integrally formed by thermal fusion bonding. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a concrete bridge or a structure such as a concrete frame forming a valve chamber, an emergency water storage tank buried underground, or a fixed pipe fixed to a hard ground or the like. On the other hand, the present invention relates to a pipe joint method for connecting a connecting pipe made of a thermoplastic resin capable of absorbing a part of an external force caused by uneven settlement or earthquake by bending or elongation, and a flexible pipe joint used therefor. .
[0002]
[Prior art]
When connecting a thermoplastic resin connection pipe to a metal fixed pipe fixed to a structure, etc., the range that can be absorbed only by the bending characteristics of the connection pipe itself is narrow, so the connection between the fixed pipe and the connection pipe is limited. Need to add a mechanical flexible joint structure.
[0003]
Conventionally, as a pipe joint method for adding such a flexible structure, as shown in FIG. 10, a bendable flexible pipe joint 50 is attached to a connecting flange 1A formed on a fixed pipe 1 made of cast iron or steel. A connecting flange portion 51A formed on a cast iron receiving pipe 51, which is one of the components, is fixedly connected by bolts 52 and nuts 53, and is a cast iron, which is one of the other components. The connecting flange portion 54A formed on the insertion tube 54 is made of cast iron, which is one of the components of the second pipe joint 60 for connecting and connecting the connecting pipe 2 made of thermoplastic resin in a retaining state. The connecting flange portion 61A formed on the joint pipe 61 is fixedly connected by bolts 52 and nuts 53.
[0004]
The flexible pipe joint 50 is made of cast iron having a receiving tube 51 having a partially spherical inner peripheral surface 51a and a partially spherical outer peripheral surface 55a slidable along the partially spherical inner peripheral surface 51a. Of the partial spherical ring 55, and an insertion tube 54 which is fitted inside the partial spherical ring 55 so as to be slidable relative to the partial spherical ring 55 in the tube axis X direction. An annular regulating groove 55b that opens radially inward is formed on the inner peripheral surface, and the outer peripheral surface of the insertion tube 54 is in contact with both end surfaces of the regulating groove 55b in the tube axis X direction. A substantially C-shaped metal retaining ring 56 that can be expanded and deformed and that restricts the relative sliding range of the partial spherical ring 55 and the insertion tube 54 in the tube axis X direction by contact is fitted.
[0005]
The second pipe joint 60 includes a joint pipe 61 having connection flange portions 61A and 61B formed at both ends, an inner peripheral surface of a receiving pipe portion 61C, and an outer peripheral surface of the connection pipe 2 inserted therein. An elastic sealing member 62 for sealing the space between the tube and the connecting flange portion 61B on the side of the receiving tube portion 61C can be tightened and fixed from the direction of the tube axis X by bolts 52 and nuts 53, and elastic as the tightening operation is performed. A cast iron press ring 64 for compressing the seal material 62 with a press ring 63 and a diameter-reducible deformable cutting ring 65 attached to the outer peripheral surface of the connection pipe 2 in a state of being bitten are provided as main components. Each of the inner peripheral surface of the press ring 64 and the outer peripheral surface of the biting ring 65 is formed into a tapered surface that guides the biting ring 65 to be elastically deformed toward the reduced diameter side as the connecting pipe 2 moves away from the joint pipe 61. ing.
[0006]
[Problems to be solved by the invention]
In the conventional pipe joint method, the flexible pipe joint 50 is bent along the partial spherical surfaces 51a and 55a of the receiving pipe 51 and the partial spherical ring 55, and the flexible pipe joint 50 is connected to the flexible pipe joint 50 via the second pipe joint 60. The flexibility of the connecting pipe 2 itself made of a thermoplastic resin, which is connected to prevent slippage, enables the external force in the bending direction caused by uneven settlement or earthquake to be efficiently absorbed. The insertion pipe 54 protrudes, and furthermore, the second pipe joint 60 provided with the joint pipe 61 and the pressing ring 64 is fixedly connected to the distal end thereof, so that it is configured between the fixed pipe 1 and the connection pipe 2. The flexible connection structure becomes large in the pipe axis X direction, leading to an increase in manufacturing cost and a decrease in construction efficiency.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and a first and a third main problem is that a flexible connection structure formed between a fixed pipe and a connection pipe has a core axial direction. The second main issue is to provide a pipe joint method that can reduce the size and cost of production and improve the efficiency of construction. It is an object of the present invention to provide a flexible pipe joint that can perform a joining process by attaching more advantageously in terms of manufacturing.
[0008]
[Means for Solving the Problems]
The characteristic feature of the pipe joint method according to claim 1 of the present invention resides in that a partially spherical inner peripheral surface formed in a receiving pipe which can be fixedly connected to an end of a pipe fixed to a structure, a ground, or the like. After attaching a partial spherical ring made of thermoplastic resin with a partial spherical outer surface slidable along the pipe in a state where it is retained from the tube axis direction, the thermoplastic resin is inserted into the through hole of this partial spherical ring. The connection pipe is internally fitted and connected from the pipe axis direction, and the partial spherical ring and the connection pipe are integrally formed by heat fusion.
[0009]
According to the above-mentioned characteristic configuration, a thermoplastic resin capable of absorbing a part of an external force caused by unequal settlement or an earthquake by bending or elongation, etc., to a fixed pipe fixed to a structure or the ground. When connecting the connecting pipe, stop the partial spherical ring made of thermoplastic resin slidable along the partial spherical inner peripheral surface in the receiving pipe that can be fixedly connected to the end of the fixed pipe. It is used in the conventional pipe joint method because the connection pipe made of thermoplastic resin is directly fitted and connected to the through hole of this partial spherical ring, and both parts are integrally formed by heat fusion in that state. The inlet pipe corresponds to the connecting pipe of the present invention, and not only the inlet pipe of the flexible pipe joint used in the conventional pipe joint method, but also the second pipe joint including the joint pipe and the press ring Can be omitted.
[0010]
Therefore, the number of parts and the number of constructions can be greatly reduced as compared with the conventional pipe joint method. Therefore, the flexible connection structure formed between the fixed pipe and the connection pipe can be made compact and manufactured in the pipe axis direction. The cost can be reduced and the construction efficiency can be improved.
[0011]
A characteristic configuration of the pipe joint method according to claim 2 of the present invention is that the partial spherical ring and the connection pipe are thermally fused by heat generated by energizing a heating element embedded in the partial spherical ring.
[0012]
According to the above characteristic configuration, since the heating element is embedded in the partial spherical ring whose length in the tube axis direction is extremely small as compared with the connection pipe, when the heating element is embedded in a portion corresponding to the internal fitting connection of the connection pipe. As compared with the method described above, the embedding of the heating element can be performed easily, and the existing connection pipe can be used as it is, so that the manufacturing cost can be reduced.
[0013]
The characteristic structure of the flexible pipe joint according to claim 3 of the present invention is that the flexible pipe joint has a partially spherical inner part formed in a receiving pipe that can be fixedly connected to an end of a fixed pipe fixed to a structure, a ground, or the like. A partial spherical ring made of thermoplastic resin with a partial spherical outer surface that is slidable along the peripheral surface is attached in a state that it is retained from the tube axis direction, and this partial spherical ring is A heating element for heat-sealing the partial spherical ring and a thermoplastic resin connection pipe internally fitted in the through hole thereof is embedded, and the heating element or the terminal connected thereto is partially This is in that it is led out through the portion on the outer peripheral surface of the spherical ring and outside the relative bending sliding region between the partial spherical ring and the receiving tube.
[0014]
According to the above-mentioned characteristic configuration, since the heating element for heat-sealing the thermoplastic resin connecting pipe internally fitted to the partial spherical ring itself is embedded in the partial spherical ring itself, a portion corresponding to the internal fitting connection of the connecting pipe. As compared with the case where the heating element is embedded, the process of embedding the heating element can be performed easily, and the existing connecting pipe can be used as it is, thereby promoting a reduction in manufacturing cost. Can be. Moreover, since the heating element or the terminal connected to the heating element is led out on the outer peripheral surface of the partial spherical ring and through a portion outside the relative sliding area between the partial spherical ring and the receiving pipe, the receiving pipe and the An adverse effect on relative sliding along the partial spherical surface with the partial spherical ring can be suppressed.
[0015]
Therefore, it is possible to advantageously perform the joining process by heat fusion between the partial spherical ring and the connection pipe in terms of manufacturing cost, while ensuring the intended smooth bending performance of the receiving pipe and the partial spherical ring. it can.
[0016]
The characteristic configuration of the flexible pipe joint according to claim 4 of the present invention is that the connecting pipe is fitted on the inner peripheral surface facing the through hole of the partial spherical ring when the connecting pipe is internally fitted to the set insertion position, and the distal end face of the connecting pipe is contacted. The point is that a contact portion is formed.
[0017]
According to the above-mentioned characteristic configuration, when the connection pipe is internally fitted and connected to the through hole of the partial spherical ring, it is only necessary to insert the connection pipe to a position where the distal end surface comes into contact with the contact portion of the partial spherical ring. It is not necessary to measure the insertion length of the partial spherical ring, and it is possible to facilitate and reliably perform the heat fusion work between the partial spherical ring and the connection pipe.
[0018]
A characteristic configuration of the flexible pipe joint according to claim 5 of the present invention is that a part corresponding to the lead-out of the outer peripheral surface of the partial spherical ring is recessed.
[0019]
According to the above-mentioned characteristic configuration, after the completion of the heat fusion work between the partial spherical ring and the connecting pipe, the heating element or the terminal led out from the partial spherical ring is replaced with a depression formed on the outer peripheral surface of the partial spherical ring. It is possible to more effectively suppress the relative sliding along the partial spherical surface between the partial spherical ring and the receiving tube.
[0020]
The characteristic feature of the pipe joint method according to claim 6 of the present invention is that a partially spherical inner peripheral surface formed in a receiving pipe which can be fixedly connected to an end of a pipe fixed to a structure, a ground, or the like. Female ring formed on the inner peripheral surface of the through-hole of this partial spherical ring after the partial spherical ring having the partial spherical outer surface slidable along The male screw portion formed at the end of the outer peripheral surface of the connecting pipe made of a thermoplastic resin is screwed into the portion.
[0021]
According to the above-mentioned characteristic configuration, a thermoplastic resin capable of absorbing a part of an external force caused by unequal settlement or an earthquake by bending or elongation, etc., to a fixed pipe fixed to a structure or the ground. When connecting the connecting pipe, a partial spherical ring that is slidable along the inner peripheral surface of the partial spherical pipe is fitted in the receiving pipe that can be fixedly connected to the end of the fixed pipe. Since the male screw portion formed on the thermoplastic resin connection tube is directly screwed and fixed to the female screw portion formed on the partial spherical ring and integrated, the insertion tube used in the conventional pipe joint method is used. However, this corresponds to the connection pipe of the present invention, and not only the insertion pipe of the flexible pipe joint used in the conventional pipe joint method, but also the second pipe joint including the joint pipe and the press ring is omitted. be able to.
[0022]
Therefore, the number of parts and the number of constructions can be greatly reduced as compared with the conventional pipe joint method. Therefore, the flexible connection structure formed between the fixed pipe and the connection pipe can be made compact and manufactured in the pipe axis direction. The cost can be reduced and the construction efficiency can be improved.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
FIGS. 1 to 6 show a part of a water pipe system which is an example of a fluid pipe system, which is fixed in a penetrating state to a structure A such as a concrete bridge portion or a concrete frame forming a valve chamber. Polyethylene, which is an example of a thermoplastic resin capable of absorbing a part of an external force caused by unequal settlement, an earthquake, or the like, by bending or elongating the end of the fixed pipe 1 made of cast iron or steel. And a flexible pipe joint B used for connecting the connection pipe 2 in a state in which the connection pipe 2 is allowed to be bent within a set angle range between the two.
[0024]
The flexible pipe joint B is made of cast iron having a connection flange portion 5A which is fastened and fixed to a connection flange portion 1A formed at an end portion of the fixed pipe 1 with a bolt 3 and a nut 4, and a partially spherical inner peripheral surface 5a. Is formed of polyethylene which is an example of a thermoplastic resin in a state where a partially spherical outer peripheral surface 6a which is slidable in a three-dimensional direction along the partially spherical inner peripheral surface 5a is formed in the receiving tube 5. The partial spherical ring 6 is attached in a state where the partial spherical ring 6 does not come off from the tube axis X direction.
[0025]
The partial spherical ring 6 and the connecting pipe 2 internally fitted in the through hole 6A thereof are thermally fused (welded) to an inner layer portion near the through hole 6A of the partial spherical ring 6 by heat generated by energization. Heating wire 7 which is an example of a heating element is embedded spirally, and both end portions 7a and 7b of the heating wire 7 are partially spherical outer peripheral surfaces 6a of the outer peripheral surface of the partial spherical ring 6. And the partial spherical inner peripheral surface 5a of the receiving tube 5 are drawn out through a portion deviating from the relative bending sliding area, that is, the end of the receiving tube 5 on the side corresponding to the receiving port. Are connected to terminals 8a and 8b.
[0026]
Therefore, as compared with the case where the heating wire 7 is buried in a portion corresponding to the inner fitting connection of the connection pipe 2, not only the embedding process of the heating wire 7 can be easily performed, but also the manufacturing cost can be reduced. In addition, both ends 7a and 7b of the heating wire 7 are out of the relative sliding area between the partial spherical ring 6 and the receiving tube 5 on the partial spherical outer peripheral surface 6a of the partial spherical ring 6. Since it is led out through the part, it is possible to suppress the adverse effect on the relative sliding of the receiving pipe 5 and the partial spherical ring 6 along the partial spherical surfaces 5a, 6a.
[0027]
As shown in FIG. 3, an inner space formed by a partially spherical inner peripheral surface 5a of the receiving tube 5 is provided at two receiving-side end portions of the receiving tube 5 and opposed to each other in the radial direction. On the other hand, in a state where the width W is slightly larger than the length L in the tube axis X direction of the partial spherical ring 6 and the diameter D1 between the opposing surfaces is slightly larger than the outer diameter D of the partial spherical ring 6. Notch 5B communicating in a penetrating state from the pipe axis X direction, in other words, only when the axis of the partial spherical ring 6 is in an assembling posture orthogonal to the pipe axis X, the partial spherical ring 6 A notch 5B is formed to allow attachment and detachment, and the internal space formed by the partial spherical inner peripheral surface 5a of the receiving tube 5 is set to the normal mounting posture of the partial spherical ring 6 inserted in the mounting posture. It is configured to have a size that allows rotation.
[0028]
When assembling the partial spherical ring 6 into the receiving tube 5, as shown in FIG. 1, the partial spherical ring 6 is set in an assembling posture in which its axis is orthogonal to the tube axis X. After being inserted into the internal space through the cutout 5B formed at the receiving end of the receiving tube 5 in that position, the partial spherical ring 6 is turned along the partial spherical inner peripheral surface 5a in this internal space. By moving the partial spherical ring 6 into a regular mounting posture in which the axis of the partial spherical ring 6 matches the pipe axis X of the receiving tube 5, the partial spherical ring 6 is attached to the receiving tube 5 in a retaining state. You.
[0029]
An elastic sealing material 9 made of synthetic rubber for sealing between a partial spherical outer surface 6a of the partial spherical ring 6 and a peripheral groove 5b formed in the partial spherical inner peripheral surface 5a of the receiving tube 5 is fitted. A bellows-like rubber cover 10 covering the receiving side of the receiving pipe 5 in close contact with the outer peripheral surface of the connecting pipe 2 is provided on the receiving side end of the outer peripheral surface of the receiving pipe 5 while being held together. An annular flange portion 5C for mounting the outer cover is formed to protrude.
[0030]
Next, a pipe joint method using the flexible pipe joint B configured as described above will be described.
As shown in FIG. 1, a partial spherical ring 6 made of polyethylene in which a heating wire 7 for electric fusion (electrofusion) is embedded is placed in an assembling posture in which its axis is orthogonal to the tube axis X. After being inserted into the internal space through the two notches 5B formed at the receiving end of the receiving tube 5 in that position, the partial spherical ring 6 is turned along the partial spherical inner peripheral surface 5a in the internal space. Then, the partial spherical ring 6 is changed to a regular mounting posture in which the axis of the partial spherical ring 6 matches the pipe axis X of the receiving tube 5, and the partial spherical ring 6 is mounted to the receiving tube 5 in a retaining state.
[0031]
At this time, when the both ends 7a and 7b of the heating wire 7 and the terminals 8a and 8b connected to the ends thereof are located on the receiving side of the receiving tube 5, the partial spherical ring is formed with respect to the receiving tube 5. 6 is attached.
[0032]
As shown in FIG. 2, a connecting flange 1A of a receiving pipe 5 on which a spherical ring 6 is mounted is connected to a connecting flange 1A of a fixed pipe 1 made of cast iron or steel fixed to the structure A in a penetrating state. After the bolt 3 and the nut 4 are tightened and fixed, the through-hole 6A of the spherical ring 6 is made of a thermoplastic resin capable of absorbing a part of the external force caused by uneven settlement, earthquake, or the like by bending or elongation. A connection pipe 2 made of polyethylene, which is an example, is internally fitted and joined.
[0033]
The AC power is supplied to the terminals 8a and 8b that are led out to the receiving side through a portion of the outer peripheral surface 6a of the partial spherical ring 6 and a part outside the relative sliding region between the partial spherical ring 6 and the receiving tube 5. When a voltage is applied by connection, the heating wire 7 buried in the inner layer near the through hole 6A of the partial spherical ring 6 generates heat by conduction, and the inner peripheral surface 6a of the partial spherical ring 6 and the outer peripheral surface of the connection pipe 2 are heated. 2a are each heated and melted, and the partial spherical ring 6 and the connection pipe 2 are integrally formed by heat fusion.
[0034]
Therefore, the inlet pipe 54 used in the conventional pipe joint method corresponds to the connecting pipe 2 of the present invention, and the inlet pipe 54 of the flexible pipe joint 50 used in the conventional pipe joint method. In addition, since the second pipe joint 60 including the joint pipe 61 and the press ring 64 can be omitted, the number of parts and the number of constructions can be significantly reduced as compared with the conventional pipe joint method, and the fixed The flexible connection structure formed between the pipe 1 and the connection pipe 2 can be made compact in the pipe axis X direction, reduced in manufacturing cost, and improved in construction efficiency.
[0035]
When the operation of heat fusion between the partial spherical ring 6 and the connection pipe 2 is completed, a portion of the outer peripheral surface 6a of the partial spherical ring 6 and outside the relative sliding area between the partial spherical ring 6 and the receiving pipe 5 The two ends 7a, 7b of the heating wire 7 led out to the receiving port side are cut at the base near the outer peripheral surface 6a of the partial spherical ring 6.
[0036]
[Second embodiment]
In the flexible pipe joint B shown in FIG. 7, the terminals 8a and 8b connected to both end portions 7a and 7b of the heating wire 7 are inserted into the outer peripheral surface 6a of the partial spherical ring 6 at locations corresponding to the lead-out of the heating wire 7. A concave portion 6B that can be disposed by the recess is formed.
[0037]
Therefore, after completion of the heat fusion work between the partial spherical ring 6 and the connection pipe 2, the heating wire 7 and the terminals 8 a and 8 b led out from the partial spherical ring 6 are attached to the outer peripheral surface of the partial spherical ring 6. It can be disposed in a recessed state in the recessed portion 6B, and more effectively exerts an adverse effect on the relative sliding of the partial spherical ring 6 and the receiving tube 5 along the partial spherical surfaces 5a, 6a. Can be suppressed.
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0038]
[Third embodiment]
In the flexible pipe joint B shown in FIG. 8, when the connecting pipe 2 is internally fitted to the inner peripheral surface 6b of the partial spherical ring 6 up to the set insertion position, the contact portion 6C abuts on the distal end surface 2b thereof. Is formed.
[0039]
Therefore, when the connection pipe 2 is internally fitted to the through hole 6A of the partial spherical ring 6, it is only necessary to insert the connection pipe 2 to a position where the distal end surface 2b of the connection pipe 2 comes into contact with the contact portion 6C of the partial spherical ring 6. In addition, it is not necessary to measure the insertion length of the connection pipe 2, and the work of heat fusion between the partial spherical ring 6 and the connection pipe 2 can be facilitated and assured.
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0040]
[Fourth embodiment]
FIG. 9 shows another pipe joint method according to the present invention, in which a cast iron receiving pipe 5 which can be fixedly connected to an end of a fixed pipe 1 made of cast iron or steel fixed to a construction A or ground. A partially spherical ring 6 made of thermoplastic resin and having a partially spherical outer peripheral surface 6a slidable along a partially spherical inner peripheral surface 5a formed thereon is prevented from being pulled out from the tube axis X direction. Then, a female screw 6D formed on the inner peripheral surface 6b of the through hole 6A of the partial spherical ring 6 is provided with a male screw formed on the end of the outer peripheral surface 2a of the connection pipe 2 made of thermoplastic resin. The portion 2A is screwed and fixed.
[0041]
In addition, a cylindrical reinforcing metal 11 made of stainless steel or the like is inserted in a tightly-fitted state at a portion corresponding to the screw connection area on the inner peripheral surface of the connection pipe 2. At one end of the flange 11, a flange 11 a that contacts the distal end surface 2 b of the connection pipe 2 is formed by bending.
[0042]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0043]
[Other embodiments]
(1) In each of the above-described embodiments, in order to assemble the partial spherical ring 6 in the receiving tube 5 in a retaining state, the partial spherical ring 6 is assembled in such a manner that its axis is orthogonal to the tube axis X. After inserting into the internal space through the notch 5B formed at the receiving end of the receiving pipe 5 in that mounting position, the partial spherical ring is formed along the partial spherical inner peripheral surface 5a in this internal space. 6 is rotated so that the axial center of the partial spherical ring 6 is changed to the regular mounting posture that matches the tube axis X of the receiving tube 5, so that the partial spherical ring 6 is prevented from being removed from the receiving tube 5. However, the present invention is not limited to this configuration. For example, the receiving port of the receiving pipe 5 is formed in an opening shape that allows the partial spherical ring 6 in the normal mounting position to be attached and detached at the pipe axis X. At the same time, the partial spherical ring 6 mounted in the normal mounting position is Exit may be mounted in appropriate mounting means such as a bolt member to prevent.
[0044]
(2) In the above-described first embodiment, polyethylene has been described as an example of the thermoplastic resin constituting the partial spherical ring 6 and the connection pipe 2, but polypropylene, polycarbonate, polyvinyl chloride, or the like may be used.
[0045]
(3) In the above-described first embodiment, when the fitting portion between the partial spherical ring 6 and the connection pipe 2 is thermally fused, the heating wire 7 that generates heat by energization is embedded in the partial spherical ring 6. The heating wire 7 may be embedded in the fitting portion of the connection pipe 2, or may be embedded in both the partial spherical ring 6 and the fitting portion of the connection pipe 2.
[0046]
Further, a heat pipe that generates heat energy that can be welded may be used as the heating element 7 for thermally fusing the fitting portion between the partial spherical ring 6 and the connection pipe 2. A heat generating substance such as a conductive polymer that generates heat by microwave irradiation is incorporated in at least one of the fitting portions of the connection pipe 2 and the fitting of the partial spherical ring 6 and the connection pipe 2 by microwave fusion means. The joint may be heat-sealed.
[0047]
(4) In the above-described first embodiment, the case where the fixed pipe 1 is fixed to a structure A such as a bridge or a skeleton is described as an example, but the emergency pipe constructed in a buried state in the ground is described. The present invention can also be effectively applied to a case where a connection pipe 2 made of a thermoplastic resin is connected to a fixed pipe connected to a water storage tank or a fixed pipe fixed to a hard ground at a boundary of a stratum.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of a flexible pipe joint according to a first embodiment of the present invention. FIG. 2 is a cross-sectional side view when a flexible pipe joint is fixedly connected to fixed piping. FIG. FIG. 4 is a cross-sectional side view when a connection pipe is internally fitted to and connected to a partial spherical ring of a flexible pipe joint. FIG. 5 is a cross-sectional side view when a rubber cover is attached after completion of the heat fusion work. FIG. 6 is an enlarged cross-sectional side view of a main part showing a maximum bending state. FIG. 7 is an enlarged cross-sectional side view of a main part showing a second embodiment of the present invention. FIG. 8 is a main part showing a third embodiment of the present invention. FIG. 9 is a cross-sectional side view showing a fourth embodiment of the present invention. FIG. 10 is a cross-sectional side view showing a conventional pipe joint method.
Reference Signs List A Structure B Flexible pipe joint X Pipe shaft 1 Fixed pipe 2 Connection pipe 2A Male thread 2a Tip surface 5 Reception pipe 5a Partially spherical inner peripheral surface 6 Partially spherical ring 6A Through hole 6B Recess 6C Recessed part 6D Female screw Part 6a Partially spherical outer peripheral surface 6b Inner peripheral surface 7 Heating element (heating wire)
8a terminal 8b terminal

Claims (6)

A partially spherical outer peripheral surface slidable along a partially spherical inner peripheral surface formed in a receiving tube that can be fixedly connected to an end of a pipe fixed to a structure or the ground, etc. After mounting a partial spherical ring made of thermoplastic resin from the tube axis direction in a retaining state, a connecting pipe made of thermoplastic resin is internally fitted and connected to the through hole of this partial spherical ring from the tube axis direction. A pipe joint method in which a spherical ring and a connection pipe are integrally formed by heat fusion. The pipe joint method according to claim 1, wherein the partial spherical ring and the connection pipe are thermally fused by heat generated by energizing a heating element embedded in the partial spherical ring. A flexible pipe joint used in the pipe joint method according to claim 1, wherein the flexible pipe joint is formed in a receiving pipe that can be fixedly connected to an end of a pipe fixed to a structure, a ground, or the like. A partial spherical ring made of a thermoplastic resin with a partial spherical outer surface slidable along the partial spherical inner peripheral surface is attached in a state that it is not pulled out from the tube axis direction, and this partial spherical ring is energized. Due to the heat generated by the heating element, a heating element for heat-sealing the partial spherical ring and a connecting pipe made of thermoplastic resin internally fitted into the through hole thereof is embedded and connected to the heating element or the heating element. A flexible pipe joint in which a terminal is led out through an outer peripheral surface of the partial spherical ring and through a portion outside a relative bending sliding region between the partial spherical ring and the receiving tube. The flexible pipe joint according to claim 3, wherein a contact portion is formed on an inner peripheral surface of the partial spherical ring when the connection tube is internally fitted to the set insertion position, and abuts against a distal end surface of the connection tube. The flexible pipe joint according to claim 3, wherein a portion corresponding to the lead-out of the outer peripheral surface of the partial spherical ring is recessed. A partially spherical outer peripheral surface slidable along a partially spherical inner peripheral surface formed in a receiving tube that can be fixedly connected to an end of a pipe fixed to a structure or the ground, etc. After the partial spherical ring is attached in a state that it cannot be removed from the tube axis direction, the female thread formed on the inner peripheral surface of the through hole of this partial spherical ring is attached to the end of the outer peripheral surface of the connecting pipe made of thermoplastic resin. A pipe joint method in which a male screw portion formed in a portion is screwed and fixed.

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