JP4936716B2 - Fixing jig for electric fusion of resin pipe - Google Patents

Description

  The present invention relates to a fixing jig for electric welding of a resin tube made of a thermoplastic resin such as polyethylene.

  In general, thermoplastic resin pipes such as polyethylene pipes are widely used for gas pipes, water pipes, drain pipes and the like because they have earthquake resistance, flexibility, and corrosion resistance. For the connection of such resin pipes, electrofusion joints are frequently used.

  Specifically, as shown in FIG. 4, the electric fusion joint 10 includes a joint body 11 made of a thermoplastic resin and heat generation such as a heating wire embedded in a fusion interface on the inner peripheral side of the joint body 11. It comprises a body 12 and a terminal portion 13 having terminal pins 131 connected to the heating element 12 and standing on the outer surface of the joint body 11. Then, the resin pipes P and P to be connected are respectively inserted into both receiving ports of the joint main body 11 of the electric fusion joint 10, and energized through a power cord (not shown) connected to the terminal pin 131. Generates heat, the resin of the joint body 11 around it and the outer surface layer of each resin pipe P are in a molten state, and the electrofusion joint 10 and both resin pipes P, P are fused. Since the joint main body 11 and the resin pipe P are integrally fused, the resin pipe P is connected by the electric fusion joint 10 as described above, so that an integral pipe line can be formed with the resin, and high reliability is ensured. be able to.

  The joint body 11 and the resin pipe P are in a molten state from the start of energization to the electrofusion joint 10 until the energization is terminated and the fused resin is reliably cooled and solidified. The resin pipe P is fixed via a fixing tool so that an external force does not act.

As such a fixing tool 15, as shown in FIG. 5, one end portions of a pair of holding portions 151 and 151 formed with a substantially semicircular inner peripheral surface having an inner diameter corresponding to the outer diameter of the resin pipe P are formed. There has been proposed one that is pivotally supported so as to be freely opened and closed and fastened between the other end portions thereof via a fastener 152 such as a bolt or a hook (for example, see Patent Document 1).
JP 2001-355784 A (FIG. 11)

  However, the above-described fixing tool has a structure that integrally holds both the resin pipes inserted into the joint body, for example, a sufficient working space such as near the wall in the pipe shaft of an apartment house or the like. If it cannot be secured, it becomes difficult to use.

  The present invention has been made in view of such problems, and a fixing jig for thermoplastic resin pipe fusion that can reliably perform resin pipe electric fusion work even in a narrow work space. It is to provide.

The present invention is a fixing jig that is used at the time of electric fusion welding of a resin pipe and temporarily fixes a joint body and a resin pipe during energization and curing, and the fixing jig has an outer diameter of the joint body. corresponding tube holding portion in which a plurality of substantially semi-round shaped protrusions of smaller inner diameter than the outer diameter of the semicircular joint holding part and the resin pipe inner peripheral surface is formed in is formed along the axial direction of the inner diameter And a pair of holding members integrally connected to each other so that the one ends of the pair of holding members can be freely opened and closed, and the other ends thereof can be fastened via a fastener. The holding member has a through-hole through which the terminal portion of the joint body can be inserted, and the through-hole formed in one holding member corresponds to the resin pipe inserted into the receiving port of the joint body. The pair of holding members are connected to the outer peripheral surface of the joint body. Beauty while being mounted on the outer peripheral surface of the inserted resin pipe on one of the socket is fastened via a fastener-holding portions of the pair of holding members which are positioned through the through hole in the terminal portion of the joint body The outer peripheral surface of the resin tube is compressed and fixed .

  In the present invention, as the joint body, in addition to the one having the electric fusion receiving port on both sides, one side has the electric fusion receiving port, and the other is formed with a pipe taper screw for connecting to a metal pipe or a faucet device. Things can be mentioned.

  In the present invention, the inner peripheral surface formed in the joint holding portion of each holding member is larger than the outer diameter of the joint body so that a clearance of 0.1 to 1 mm is secured with respect to the outer peripheral surface of the joint body. It is preferable to set the inner diameter to be 0.2 to 2 mm larger.

  In the present invention, the protrusion formed on the tube holding portion of each holding member preferably has an inner diameter of 97 to 99% of the outer diameter of the resin tube. Thereby, when a fixing jig is mounted, a certain compressive force can be applied to the resin tube, and the resin tube can be fixed so as not to move with respect to the joint body.

  In the present invention, examples of the tool for fastening include, but are not limited to, bolting, hooking, a clamp lever, and a fastener metal fitting.

  According to the present invention, after inserting the resin pipes into the both receiving ports of the joint body of the electrofusion joint, the through hole formed in one holding member of the fixing jig is inserted into one terminal portion of the joint body. The inner peripheral surface of the joint holding part and the protrusion of the pipe holding part are placed on the outer peripheral surface of the joint main body and the outer peripheral surface of the resin pipe, respectively. Next, the other holding member of the fixing jig is rotated with respect to the one holding member, and the inner peripheral surface of the joint holding portion and the projection of the tube holding portion are covered with the one holding member. After the outer peripheral surface and the outer peripheral surface of the joint body on the side facing the outer peripheral surface of the resin tube are brought into close contact with the outer peripheral surface of the resin tube, the other end portion of one holding member and the other end portion of the other holding member are fastened. To do.

  Similarly, hold another fixing jig, insert the through hole formed in one holding member into the other terminal part of the joint body, and insert the inner peripheral surface of the joint holding part and the projection of the pipe holding part. Are placed on the outer peripheral surface of the joint body and the outer peripheral surface of the resin pipe, respectively. Next, the other holding member of the fixing jig is rotated with respect to the one holding member, and the inner peripheral surface of the joint holding portion and the projection of the tube holding portion are covered with the one holding member. After the outer peripheral surface and the outer peripheral surface of the joint body on the side facing the outer peripheral surface of the resin tube are brought into close contact with the outer peripheral surface of the resin tube, the other end portion of one holding member and the other end portion of the other holding member are fastened. To do.

  As a result, when the joint body and the resin pipe are fused, the fixing jigs are attached to the respective joint openings of the joint body, so that the right and left resin pipes are supported and fixed at the same time in the axial direction. The length is shortened, and the resin pipe can be reliably temporarily fixed to the joint body even in a narrow work space.

  In the present invention, when a work confirmation hole penetrating in the radial direction is formed in one holding member in which a through hole is formed corresponding to the receiving portion of the joint body, the insertion state of the resin pipe with respect to the joint body is determined. It can be grasped through the work confirmation hole, which is preferable. In this case, the shape of the work confirmation hole is not limited, but an elliptical cross section is preferable in order to improve visibility.

  According to the present invention, it is possible to reliably perform the electric fusion work of the resin pipe even in a narrow work space. Also, even if the joint body has a pipe taper screw for the purpose of connecting to a metal pipe or faucet, etc. at one receiving port and a heating element and terminal pin are provided at the other receiving port, the electric fusion In the connection work between the receiving port and the resin tube inserted into the receiving port, the resin tube can be securely fixed to the joint body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In addition, about the electrofusion joint 10, it is as having demonstrated previously, the same code | symbol is attached | subjected to the same member, and detailed description is abbreviate | omitted.

  FIG. 1 and FIG. 2 show an embodiment of a fixing jig 1 for electric fusion of a thermoplastic resin pipe of the present invention.

  The fixing jig 1 temporarily fixes the joint main body 11 of the electric fusion joint 10 and the resin pipes P respectively inserted into the respective receiving ports of the joint main body 11, and includes a pair of holding members 2A and 2B. One end portions are connected to each other through a hinge 3 so as to be freely opened and closed, and the other end portions are configured to be fastened through a fastener 4, for example, a clamp lever.

Each holding member 2A, 2B, as shown in detail in Figure 2, of the joint holding part 21 and the resin pipe P which substantially semicircular inner peripheral surface 211 of inside diameter corresponding to the outside diameter is formed in the joint body 11 A tube holding part 22 in which a plurality of substantially semicircular projections 221 having an inner diameter smaller than the outer diameter is formed in the axial direction is integrally formed. Each holding member 2A, 2B has a joint body 11 of which A through hole 2a having an inner diameter capable of accommodating the terminal portion 13 corresponding to one terminal portion 13 is formed in the joint holding portion 21, and corresponding to the receiving port of the joint main body 11, that is, the joint holding portion 21 and An operation confirmation hole 2b having an oval cross section penetrating in the radial direction across the tube holding portion 22 is formed apart from the through hole 2a (see FIG. 1).

  A counterbore is formed at the upper end portion of the through hole 2a in order to avoid interference with the power supply terminal portion mounted on the connector pin 131.

  Here, the inner peripheral surface 211 formed on the joint holding portion 21 of each holding member 2A, 2B is 0. 0 relative to the outer peripheral surface of the joint main body 11 in consideration of the protrusion 221 of the tube holding portion 22 described later. The inner diameter is set to be 0.2 to 2 mm larger than the outer diameter of the joint body 11 so that a clearance of 1 to 1 mm is secured.

  Further, the protrusion 221 formed on the tube holding portion 22 of each holding member 2A, 2B has an inner diameter set to 97 to 99% of the outer diameter of the resin tube P. On the other hand, a compressive force of 1 to 3% corresponding to the difference in diameter is applied.

  The joint main body 11 of the electric fusion joint 10 is provided with an indicator 14 formed by forming a depression having a pin 141 at the center position in a radial direction at a position corresponding to the heating element 12. In some cases, the resin in the depression flows in the direction of the outer peripheral surface due to the expansion pressure of the molten resin, so that the pin 141 protrudes from the outer peripheral surface of the joint body 11. The proper end of fusion can be determined by the amount of protrusion of the pin 141 in the indicator 14, and consequently whether or not the resin pipe P is fused to the joint body 11 can be determined.

  Therefore, the axial length of each holding member 2A, 2B is provided in the electrofusion joint 10 when the joint body 11 and the resin pipe P inserted into one receiving port of the joint body 11 are mounted. The indicator 14 is set so as not to interfere with the indicator 14.

  Next, the operation of the fixing jig 1 configured as described above will be described.

  After inserting the resin pipes P and P to be connected into both receiving ports of the joint main body 11 of the electric fusion joint 10, the fixing jig 1 is gripped, and the through hole 2a formed in one holding member 2A is joined to the joint. One terminal portion 13 of the main body 11 is inserted, and the inner peripheral surface 211 of the joint holding portion 21 and the protrusion 221 of the pipe holding portion 22 are placed on the outer peripheral surface of the joint main body 11 and the outer peripheral surface of the resin pipe P, respectively. Next, the other holding member 2B of the fixing jig 1 is rotated around the hinge 3 with respect to the one holding member 2A, and the inner peripheral surface 211 of the joint holding portion 21 and the protrusion 221 of the tube holding portion 22 are moved forward. The one holding member 2A is placed on and covered with the outer peripheral surface of the joint main body 11, the outer peripheral surface of the joint main body 11 on the side facing the outer peripheral surface of the resin pipe P, and the outer peripheral surface of the resin pipe P. Thereafter, the other end of one holding member 2 </ b> A and the other end of the other holding member 2 </ b> B are fastened via a fastener 4.

  Here, since the inner diameter of the protrusion 221 formed on the tube holding portion 22 of each holding member 2A, 2B is slightly smaller than the outer diameter of the resin tube P, the resin tube P is compressed. That is, the fixing jig 1 has the through hole 2 a of the holding member 2 </ b> A inserted through the terminal portion 13 of the joint body 11 and positioned in the joint body 11, and the joint body 11 by the fixing jig 1 positioned in the joint body 11. On the other hand, the resin pipe P can be fixed.

  At this time, since the inner diameter of the inner peripheral surface 211 formed on the joint holding portion 21 of each holding member 2A, 2B is slightly larger than the outer diameter of the joint body 11, the joint of each holding member 2A, 2B The inner peripheral surface of the holding portion 21 has a margin with respect to the outer peripheral surface of the joint body 11.

  The insertion state of the resin pipe P with respect to the joint body 11 can be grasped through the work confirmation hole 2b.

  Similarly, the other fixing jig 1 is gripped, the through hole 2a formed in one holding member 2A is inserted into the other terminal portion 13 of the joint body 11, and the inner peripheral surface of the joint holding portion 21 is inserted. 211 and the protrusion 221 of the tube holding part 22 are placed on the outer peripheral surface of the joint body 11 and the outer peripheral surface of the resin tube P, respectively. Next, the other holding member 2B of the fixing jig 1 is rotated around the hinge 3 with respect to the one holding member 2A, and the inner peripheral surface 211 of the joint holding portion 21 and the protrusion 221 of the tube holding portion 22 are moved forward. The one holding member 2A is placed on and covered with the outer peripheral surface of the joint main body 11, the outer peripheral surface of the joint main body 11 on the side facing the outer peripheral surface of the resin pipe P, and the outer peripheral surface of the resin pipe P. Thereafter, the other end of one holding member 2 </ b> A and the other end of the other holding member 2 </ b> B are fastened via a fastener 4.

  As described above, when the joint body 11 and the resin pipe P are fused, the left and right resin pipes P and P are simultaneously supported and fixed by attaching the fixing jigs 1 to the respective receiving ports of the joint body 11. In comparison, the axial length is shortened, and the resin pipe P can be reliably fixed to the joint body 11 even in a narrow work space.

  If the resin pipes P respectively inserted into the receiving ports of the joint body 11 are supported and fixed by the corresponding fixing jigs 1, if the power cord is connected to the terminal pin 13 and energized, the heating element 12 generates heat. Then, the resin of the joint body 11 and the outer surface layer of each resin pipe P around it are in a molten state, so that the joint body 11 of the electrofusion joint 10 and both resin pipes P, P are fused. In other words, the resin at the fusion interface portion of the joint body 11 that has been heated and expanded is surrounded by the resin of the joint body 11 whose outer periphery is solidified at room temperature, so that the contact surface between the joint body 11 and the resin pipe P is surrounded. A certain surface pressure acts between them, and both are fused.

  The quality of this fusion work can be grasped by the indicator 14. Specifically, when the resin is melted, the expansion pressure of the molten resin acts on a recess that is weak in strength, the resin in the recess flows in the direction of the outer peripheral surface, and the pin 141 protrudes from the outer peripheral surface of the joint body 11. Thus, whether or not the resin pipe P is fused to the joint body 11 can be determined.

  Note that when the power terminal portion is attached to the terminal portion 13, a counterbore is formed in the through holes 2 a of the holding members 2 </ b> A and 2 </ b> B, thereby avoiding interference with the holding members 2 </ b> A and 2 </ b> B. The pin 131 can be securely connected.

  By the way, in embodiment mentioned above, in order to prevent interference with each holding member 2A, 2B and the indicator 14, it formed in the joint holding part 21 of the length which does not interfere with the indicator 14, However, The protrusion of the pin 141 of the indicator 14 is carried out. Since it is only necessary to grasp the situation, a notch 21a (see FIG. 3) or a confirmation hole may be formed in the joint holding portion 21 at a position corresponding to the indicator 14 to prevent interference with the indicator 14.

  Further, as the joint body 11 of the electric fusion joint 10, the heating elements 12 are respectively embedded in the fusion interface on the inner peripheral side of both receiving ports, and the terminal pins 131 connected to the respective heating elements 12 are joints. Although an example of standing on the outer surface of the main body 11 is illustrated, although not shown in detail, the heating element 12 is embedded only in one receiving port, and the terminal pin 131 connected to the heating element 12 includes a joint body 11. It may be a joint body that is erected on the outer surface of the pipe and has a taper screw (a male screw or a female screw) formed on the other receiving port and can be connected to a metal pipe or a faucet device. Even in such a joint main body, the fixing jig 1 can be mounted corresponding to each receiving port of the joint main body, so that the resin pipe inserted into the electric fusion receiving port can be securely attached to the joint main body. Can be temporarily fixed.

  As described above, according to the present invention, the electric fusion work of the resin pipe can be reliably performed even in a narrow work space, so that the construction range of the highly reliable electric fusion joint can be expanded.

It is a perspective view which shows one Embodiment of the electric welding fixing jig | tool of the resin pipe of this invention with the resin pipe inserted in the electric fusion joint and its joint main body. It is a longitudinal cross-sectional view which abbreviate | omits and shows the fixing state of the resin pipe with respect to the coupling main body by the fixing jig of FIG. It is a perspective view which shows other embodiment of the electric fusion fixing jig of the resin pipe of this invention with the resin pipe inserted in the electrofusion joint and its joint main body. It is a front view which shows an electric fusion joint partly fractured | ruptured with the resin pipe inserted in the joint main body. It is a front view which shows a conventional electric fusion fixing tool together with an electric fusion joint and a resin tube inserted into the joint body, partially broken.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing jig 2A, 2B Holding member 21 Joint holding part 211 Inner peripheral surface 22 Pipe holding part 221 Protrusion 3 Hinge 4 Fastening tool 10 Electric fusion joint 11 Joint main body 12 Heating element 13 Terminal part 131 Terminal pin 14 Indicator 141 Pin P Resin pipe

Claims (2)

A fixing jig that is used at the time of electric welding of a resin pipe and temporarily fixes the joint body and the resin pipe during energization and curing, and the fixing jig has an inner diameter corresponding to the outer diameter of the joint body. having a tube holding portion having a plurality of substantially semi-round shaped protrusions of smaller inner diameter than the outer diameter is formed along the axial direction of the substantially semicircular joint holding part and the resin pipe inner peripheral surface is formed of integrally It is composed of a pair of holding members, and one end portions of the pair of holding members are connected to each other so as to be openable and closable, and the other end portions are configured to be fastened via a fastener, and at least one holding member includes A through-hole through which the terminal portion of the joint body can be inserted is formed, and a through-hole formed in one holding member is formed in one terminal portion of the joint body corresponding to the resin pipe inserted into the receiving port of the joint body. The pair of holding members are inserted through the outer peripheral surface of the joint body and While being mounted on the outer peripheral surface of the receptacle in the inserted resin pipe is fastened via a fastener-holding portion is a resin tube of the pair of holding members which are positioned through the through hole in the terminal portion of the joint body An electric fusion fixing jig for a resin tube, wherein the outer peripheral surface of the resin tube is compressed and fixed .   2. The electric welding of the resin pipe according to claim 1, wherein an operation confirmation hole penetrating in a radial direction is formed in one holding member in which a through hole is formed, corresponding to the receiving portion of the joint body. fixing jig.

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