JP2014111973A - Joint jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint jig capable of preventing excessive time and efforts from being spent for aligning a flange joint.SOLUTION: A joint jig 1 for aligning a pair of abutted flange joints comprises: a base member 2 including a pair of counter parts 20, 21 which oppose each other while being spaced apart from each other, and a continuation part 22 continued to the counter parts 20, 21; an insertion member 4 which is provided in one of the counter parts 20, 21 and inserted to a through hole of at least one flange joint in the state where the pair of flange joints F, F are interposed between the pair of counter parts 20, 21; a pressing member 4 which is provided in the continuation part 22 and is movable across an inserting direction of the insertion member 4; and a holding part 5 for holding the pair of flange joints between the pair of counter parts 20, 21.

Description

  The present invention relates to a joint jig for aligning a flange joint.

  Conventionally, in facilities such as power plants, pipes for transporting fluids have been configured, and piping members (pipes, valves, etc.) constituting the pipes are connected to other members. Some flange joints are provided.

  Some of such flange joints are formed in a bowl shape and have a plurality of through holes.

  In order to connect two members using such a flange joint, the flange joints are first butted together. And a pipe is connected by screwing a nut in the bolt inserted in the through-hole of a pair of flange joint.

  By the way, the above-mentioned pipe line is comprised by connecting a some piping member in order. Therefore, as shown in FIG. 7A, a member to be connected (a member to be connected) due to the influence of distortion (manufacturing error of the member constituting the pipe itself, distortion due to deformation, etc.) generated in the pipe member in the process of constituting the pipe line. In FIG. 7, the flange joints F of the pair of pipes P and P) may be displaced from each other.

  In such a case, the flange joints F and F are connected to each other after the positions of the pair of flange joints F and F are matched. More specifically, while maintaining a state in which the positions of the pair of flange joints F, F are maintained, a bolt is inserted into the through hole, and further, a nut is screwed into the bolt so that the flange joint F, F are connected.

  In the above-described work, assuming that it is difficult to perform another work while maintaining the state in which the positions of the flange joints F and F are associated with each other, the joint for positioning the flange joints F and F is used. A jig is used.

  In such a joint jig, as shown in FIG. 7B, an insertion member 70 for insertion into the through hole F1 of the flange joint F, a base member 71 provided with the insertion member 70, and the base member 71 And a pressing member 72 that is movable in a direction orthogonal to the insertion direction of the insertion member 70 (see, for example, Patent Document 1).

  In order to align the position of the pair of flange joints F and F using this type of joint jig 7, the insertion member is inserted into the through hole F1 of one flange joint F of the pair of flange joints F and F that are abutted. After inserting 70, the pressing member 72 is moved (moved in a direction orthogonal to the inserting direction of the inserting member 70) and pressed against the other flange joint F. Thus, by adjusting the position of the other flange joint F with respect to the one flange joint F, the positions of the pair of flange joints F and F can be adjusted.

Japanese Utility Model Publication No. 07-020227

  By the way, in the above-mentioned joint jig 7, the pair of flange joints F and F cannot be prevented from moving with each other. Therefore, the positions of the pair of flange joints F and F may be shifted again. Therefore, in the joint jig 7 described above, it is sometimes necessary to realign the pair of flange joints F, F.

  In addition, the pair of flange joints F and F are not only displaced from each other, but are also separated from each other as shown in FIG. 8A or in different postures as shown in FIG. 8B. There is a case. In such a case, since the above-described joint jig 7 cannot bring the pair of flange joints F and F into a butted state, the operator can join the pair of flange joints F and F while fitting the pair of flange joints F and F together. An operation of attaching the tool 7, an operation of inserting a bolt into the through hole F1 of the flange joint F, and an operation of screwing a nut into the bolt are performed.

  Therefore, in the joint jig 7 described above, it may take time to align the positions of the pair of flange joints F and F.

  Then, this invention makes it a subject to provide the jig for a joint which can prevent taking time and time for the operation | work which aligns the position of a flange joint in view of this situation.

  A joint jig according to the present invention is a joint jig for aligning the positions of a pair of butted flange joints, and a pair of facing portions facing each other with a gap therebetween, and a continuous portion connected to each facing portion. A base member that is provided in one of the opposing portions, and an insertion member that is inserted into a through hole of at least one of the flange joints in a state where the pair of flange joints are interposed between the pair of opposing portions; And a pressing member that is movable in a direction intersecting the insertion direction of the insertion member, and a sandwiching portion that sandwiches the pair of flange joints between the pair of opposed portions.

  According to the joint jig configured as described above, the insertion member is inserted into the through hole of one flange joint among the pair of flange joints disposed between the pair of opposed portions of the base member, and the insertion member is inserted. The pressing member is moved in a direction crossing the direction. Thus, by pushing the other flange joint with the pressing member, the other flange joint can be moved relative to the one flange joint, and the position of the pair of flange joints can be adjusted.

  Furthermore, the flange joint between a pair of opposing parts can be clamped by the clamping part. Therefore, it is possible to maintain a state in which the pair of flange joints that are separated from each other are in contact with each other, or to prevent the pair of flange joints from being displaced from each other again.

  In this case, the clamping portion may be provided with a pressing member that is provided in the other facing portion and is movable in a direction in which the clamping portion is in contact with or separated from the one facing portion.

  In this way, when the pair of flange joints are interposed between the pair of facing portions, and the pressing member is moved in a direction approaching the one facing portion, the pair of pressing members and the one facing portion is paired. Can be clamped. Then, when the pressing member is moved in a direction away from the one opposing portion, the clamping of the pair of flange joints by the pressing member and the one opposing portion can be released.

  Therefore, it is possible to maintain a state in which the pair of flange joints that are separated from each other are in contact with each other, or to prevent the pair of flange joints from being displaced from each other again.

  In this case, the insertion member may have an insertion portion main body that is switchable between a state where the insertion member is advanced to the other facing portion side and a retracted state with respect to the other facing portion. If it does in this way, after retreating an insertion part main part from between a pair of counter parts, a pair of flange joints can be arranged between a pair of counter parts. Therefore, the pair of flange joints can be easily disposed between the pair of opposed portions.

  In this case, the insertion member can be inserted over the through holes of the pair of flange joints. If it does in this way, the state which has adjusted the position of the at least one part of the through-hole of a pair of flange joint by the insertion member can be maintained. That is, the relative movement of the pair of flange joints can be suppressed by inserting the insertion member over the through holes of the pair of flange joints. Therefore, the operation of pressing the flange joint with the pressing member and holding the pair of flange joints with the holding portion can be easily performed.

  As described above, according to the joint jig of the present invention, it is possible to achieve an excellent effect that it is possible to prevent labor and time from being spent on the operation of aligning the flange joint.

FIG. 1 is a perspective view of a joint jig according to a first embodiment of the present invention. FIG. 2 is a side view of the joint jig according to the embodiment. FIG. 3 is an explanatory view of a flange joint positioning operation using the joint jig according to the embodiment, and FIG. 3A is an explanatory view of a state in which the joint jig is attached to the flange joint. 3B is an explanatory view showing a state in which the flange joint is being pressed by the pressing member, and FIG. 3C is an explanatory view showing a state in which the flange joint aligned by the joint jig is connected. FIG. 4 is a perspective view of the joint jig according to the second embodiment of the present invention. FIG. 5 is a side view of the joint jig according to the embodiment. FIG. 6 is an explanatory view of a flange joint positioning operation using the joint jig according to the embodiment, and FIG. 6A is an explanatory view of a state in which the joint jig is attached to the flange joint. 6B is an explanatory view showing a state in which the flange joint is being pressed by the pressing member, and FIG. 6C is an explanatory view showing a state in which the flange joint aligned by the joint jig is connected. FIG. 7 is an explanatory view of a conventional joint jig, FIG. 7A is an explanatory view of a state in which a pair of flange joints are displaced from each other, and FIG. 7B is a flange joint using a joint jig. It is explanatory drawing of the state which match | combined these positions. FIG. 8 is an explanatory diagram of a state where the pair of flange joints are displaced from each other, and FIG. 8A is an illustration of a state where the pair of flange joints are displaced from each other and the pair of flange joints are separated from each other. FIG. 8B is an explanatory diagram of a state in which the pair of flange joints are displaced from each other and the postures of the pair of flange joints are different from each other.

  Hereinafter, a joint jig according to an embodiment of the present invention will be described with reference to the accompanying drawings. The joint jig is a joint jig for aligning the positions of a pair of flange joints. In addition, in this embodiment, as shown to FIG. 7A, it demonstrates on the assumption that alignment of the flange joint F provided in the pipe P is performed. Further, the flange joint F will be described for a case where it is formed in a bowl shape and has a plurality of through holes.

  As shown in FIG. 1, the joint jig 1 includes a base member 2 having opposing portions 20, 21 facing each other with a space therebetween and a connecting portion 22 connected to each opposing portion 20, 21, and one opposing portion 20. An insertion member 3 that is provided and inserted in the through hole of the pair of flange joints F and F, and a pressing member that is provided in the connecting portion 22 and is movable in a direction crossing the insertion direction of the insertion member 3. 4 and a clamping part 5 for clamping a pair of flange joints F between the opposing parts 20 and 21.

  As shown in FIG. 2, a screw hole 200 is formed in one facing portion 20. A screw hole 210 is formed in the other facing portion 21. The screw hole 200 of one facing part 20 and the screw hole 210 of the other facing part 21 are formed at corresponding positions in the direction in which the facing parts 20 and 21 are arranged (hereinafter referred to as the first direction). Further, the connecting portion 22 is formed with a screw hole 220 penetrating in a second direction orthogonal to the first direction.

  The insertion member 3 has an insertion portion main body 31 that can be switched between a state of being advanced toward the other facing portion 21 side and a state of being retracted relative to the one facing portion 20. More specifically, the insertion member 3 is a male screw portion 30 that is screwed into one facing portion 20, and is a second end opposite to the first end in the axial direction. A male screw part 30 having an end, an insertion part main body 31 provided at a first end of the male screw part 30, and an operation part 32 provided at a second end of the male screw part.

  The outer diameter of the insertion portion main body 31 decreases as it extends from the male screw portion 30. That is, the insertion portion main body 31 is formed in a tapered shape. In the insertion member 3, the male screw portion 30 is screwed into the screw hole 200 of the one opposing portion 20 so that the insertion portion main body 31 is positioned on the other opposing portion 21 side.

  The pressing member 4 is a male screw portion 40 that is screwed into the screw hole 220 of the connecting portion 22 and has a first end in the axial direction and a second end opposite to the first end. It has a screw part 40, a pressing part 41 provided at the first end of the male screw part 40, and an operation part 42 provided at the second end of the male screw part 40. In the pressing member 4, the male screw portion 40 is screwed into the screw hole 220 of the connecting portion 22 so that the pressing portion 41 can be positioned between the pair of facing portions 20 and 21.

  The clamping unit 5 includes a pressing member 51 that is provided in the other facing portion 21 and is movable in a direction in which it is in contact with and away from the one facing portion 20. More specifically, the sandwiching portion 5 is a male screw portion 50 that is screwed into the screw hole 210 of the other facing portion 21, and has a first end in the axial direction and a side opposite to the first end. A male screw part 50 having a second end, a pressing member 51 provided at the first end of the male screw part 50, and an operation part 52 provided at the second end of the male screw part 50.

  The male screw portion 50 is configured to rotate independently of the pressing member 51. The pressing member 51 is formed in a plate shape. In the clamping part 5, the male screw part 50 is screwed into the screw hole 210 of the other opposing part 21 so that the pressing member 51 is positioned between the pair of opposing parts 20 and 21. That is, in the clamping part 5, the pressing member 51 is attached to the male screw part 50 after the male screw part 50 is screwed into the screw hole 210 of the other facing part 21.

  The joint jig 1 according to the present embodiment is as described above. Subsequently, an operation of aligning the positions of the pair of flange joints F and F using the joint jig 1 according to the present embodiment will be described with reference to the accompanying drawings.

  In order to align the pair of flange joints F and F with the joint jig 1, first, the joint jig 1 is arranged so that the pair of flange joints F and F are positioned between the opposed portions 20 and 21. To do. That is, the opposing portions 20 and 21 are disposed outside the pair of flange joints F and F in the first direction. And the operation part 32 of the insertion member 3 is operated, and the insertion part main body 31 is advanced from one opposing part 20. As shown in FIG.

  At this time, the insertion portion can be inserted so that the insertion portion main body 31 can be inserted into the through hole F1 of the one flange joint F and the one flange joint F can be brought into contact with the one opposing portion 20. The advancing amount from the one opposing portion 20 of the main body 31 is adjusted.

  And the operation part 52 of the clamping part 5 is operated, and the pressing member 51 is moved to the one opposing part 20 side. In this way, as shown in FIG. 3A, the pair of flange joints F and F are sandwiched between the pressing member 51 and the one opposing portion 20, and the flange joints F and F are brought into contact with each other (matched).

  Further, as shown in FIG. 3B, the operating portion 42 of the pressing member 4 is operated to move the pressing portion 41 in the second direction, and the other flange joint F is pressed by the pressing portion 41. At this time, since one flange joint F is restricted in movement in the second direction by the insertion member 3 (insertion body 31), the other flange joint F moves relative to one flange joint F. To do. In this way, the positions of the pair of flange joints F and F are aligned.

  And by operating the operation part 52 of the clamping part 5, the pressing member 51 is further moved to the one opposing part 20 side. More specifically, when the pair of flange joints F and F are sandwiched with a stronger force between the one opposing portion 20 and the pressing member 51, the positions of the pair of flange joints F and F correspond to each other. Maintain the state. Then, as shown in FIG. 3C, the flange joints F and F are connected to each other by screwing the nut N into the bolt B inserted through the through hole F1 of the pair of flange joints F and F.

  As described above, according to the joint jig 1 according to the present embodiment, by pressing the other flange joint F with the pressing member 4, the positions of the pair of flange joints F and F can be adjusted, and further sandwiched. By sandwiching the flange joint F between the opposed portions 20 and 21 by the portion 5, it is possible to maintain a state in which the positions of the pair of flange joints F and F correspond to each other. Accordingly, it is possible to maintain the state in which the pair of flange joints F and F are in contact with each other and to prevent the pair of flange joints F and F from being displaced from each other again. It is possible to achieve an excellent effect that it is possible to prevent extra labor and time from being spent together.

  Moreover, since the insertion member 3 has the insertion part main body 31 which can be switched to the state which advanced to the other opposing part 21 side rather than the one opposing part 20, and the retracted state, the insertion part main body A pair of flange joints F and F can be arranged between the opposing portions 20 and 21 in which 31 is retracted from between the pair of opposing portions 20 and 21. Therefore, the pair of flange joints F and F can be easily disposed between the facing portions 20 and 21.

  And since the insertion part main body 31 of the insertion member 3 is formed in the taper shape, it can insert in the through-hole F1 of various diameters.

  The description of the joint jig according to the first embodiment of the present invention is as described above. Subsequently, the joint jig according to the second embodiment of the present invention will be described with reference to the accompanying drawings. In addition, about the same structure as the jig | tool for joints which concerns on 1st embodiment, or the structure corresponding, it shall attach | subject and demonstrate the same code | symbol. Moreover, about the same structure or a corresponding structure, the description in 1st embodiment may be used.

  And also in this embodiment, as shown to FIG. 7A, it demonstrates on the assumption that the flange coupling F provided in the pipe P is aligned. Furthermore, the flange joint F is formed in a bowl shape and will be described for a case where a plurality of through holes are formed.

  The joint jig 1 is for aligning the positions of the pair of flange joints F and F. More specifically, as shown in FIG. 4, the joint jig 1 includes a base member 2 having opposing portions 20 and 21 that face each other with a space therebetween and continuous portions 22 that are connected to the opposing portions 20 and 21. The insertion member 3 provided in one facing portion 20 and inserted into the through hole F1 of the pair of flange joints F and F, and provided in the connecting portion 22 and intersecting the insertion direction of the insertion member 3 The pressing member 4 is movable in the direction to be held, and the clamping portion 5 for clamping the pair of flange joints F between the opposing portions 20 and 21. Further, the joint jig 1 includes a fixing member 6 for pressing and fixing the flange joint F against the insertion member 3.

  As shown in FIG. 5, a screw hole 210 is formed in the other facing portion 21. And the threaded hole 220 penetrated in the 2nd direction orthogonal to a 1st direction is formed in the connection part 22. As shown in FIG. Further, the continuous portion 22 is formed with a long hole 221 having a length in the direction in which the facing portions 20 and 21 are arranged (hereinafter referred to as a first direction).

  The insertion member 3 extends from one facing portion 20 toward the other facing portion 21. More specifically, the insertion member 3 includes a first insertion extension portion 33 that extends from one facing portion 20 toward the other facing portion 21, and the first insertion extension. And a second insertion extending portion 34 extending from the distal end portion of the protruding portion 33. The outer diameter of the first insertion extension 33 is larger than the outer diameter of the second insertion extension 34.

  The pressing member 4 is a male screw portion 40 that is inserted into the elongated hole 221 of the connecting portion 22 and has a first end in the axial direction and a second end opposite to the first end. A pressing portion 41 provided at the first end of the male screw portion 40, and an operation portion 42 provided at the second end of the male screw portion 40. Further, the pressing member 4 has a pair of tightening portions 43 and 43 that are positioned on both sides of the connecting portion 22 and screwed into the male screw portion 40.

  In the pressing member 4, the male screw portion 40 is inserted into the elongated hole 221 of the connecting portion 22 so that the pressing portion 41 can be positioned between the pair of opposing portions 20 and 21. Therefore, the pressing member 4 can be adjusted in position (position in the second direction) along the shape of the long hole 221, and the connecting portion 22 is sandwiched between the fastening portions 43 and 43. The position (position in the second direction) with respect to can be fixed.

  The clamping part 5 is the same as that of said 1st embodiment.

  The fixing member 6 is a male screw portion 60 that is screwed into the screw hole 220 of the connecting portion 22 and has a first end in the axial direction and a second end opposite to the first end. It has a screw part 60, a fixing part 61 provided at the first end of the male screw part 60, and an operation part 62 provided at the second end of the male screw part 60. In the fixing member 6, the male screw portion 60 is screwed into the screw hole 220 of the connecting portion 22 so that the pressing portion 41 can be positioned between the pair of facing portions 20 and 21. The fixing member 6 is provided so that the fixing portion 61 is aligned with the first insertion extending portion 33 in the second direction.

  The joint jig 1 according to the present embodiment is as described above. Subsequently, an operation of aligning the positions of the pair of flange joints F and F using the joint jig 1 according to the present embodiment will be described with reference to the accompanying drawings.

  In order to align the pair of flange joints F and F with the joint jig 1, first, the joint jig 1 is arranged so that the pair of flange joints F and F are positioned between the opposed portions 20 and 21. To do. Then, the first insertion extending portion 33 is inserted into the through hole F1 of one flange joint F, and the second insertion extending portion 34 is inserted into the through hole F1 of the other flange joint F. That is, the insertion member 3 is inserted across the through holes F1 of the pair of flange joints F and F.

  Then, the operating portion of the fixing member 6 is operated to move the fixing portion 61 toward the first insertion extending portion 33 side. In this way, one flange joint F is sandwiched between the fixing portion 61 and the first insertion extending portion 33. Furthermore, the pressing member 51 is moved closer to the one opposing portion 20 by operating the operation portion 52 of the clamping portion 5. In this way, as shown in FIG. 6A, the pair of flange joints F and F are sandwiched between the pressing member 51 and the one opposing portion 20, and the flange joints F and F are brought into contact with each other.

  Then, the position of the pressing member 4 is made to correspond to the position of the other flange joint F, and the pressing member 4 is fixed to the connecting portion 22 by tightening the connecting portion 22 with the fastening portions 43 and 43. Further, as shown in FIG. 6B, the operating portion 42 of the pressing member 4 is operated to move the pressing portion 41 in the second direction, and the pressing portion 41 presses the other flange joint F.

  At this time, since one flange joint F is restricted in movement in the second direction by the insertion member 3 (first insertion extension portion 33) and the fixing member 6, one flange joint F In contrast, the other flange joint F moves. In this way, the positions of the pair of flange joints F and F are aligned.

  And by operating the operation part 52 of the clamping part 5, the pressing member 51 is further moved to the one opposing part 20 side. More specifically, the pair of flange joints F and F are sandwiched and sandwiched between the one opposing portion 20 and the pressing member 51, thereby maintaining the state in which the positions of the pair of flange joints F and F correspond to each other. To do. Then, as shown in FIG. 6C, the flange joints F and F are connected to each other by screwing a nut N into the bolt B inserted through the through holes F1 and F1 of the pair of flange joints F and F.

  As described above, according to the joint jig 1 according to the present embodiment, the pair of flange joints F and F between the opposed portions 20 and 21 are sandwiched by the sandwiching portion 5, thereby Since the state where the positions correspond to each other can be maintained, the position of the flange joint F can be prevented from being shifted again. Therefore, an excellent effect that the position of the flange joint F can be adjusted more reliably can be obtained.

  As described above, according to the joint jig 1 according to the present embodiment, by pressing the other flange joint F with the pressing member 4, the positions of the pair of flange joints F and F can be adjusted, and further sandwiched. By sandwiching the flange joint F between the opposed portions 20 and 21 by the portion 5, it is possible to maintain a state in which the positions of the pair of flange joints F and F correspond to each other. Accordingly, it is possible to maintain the state in which the pair of flange joints F and F are in contact with each other and to prevent the pair of flange joints F and F from being displaced from each other again. It is possible to achieve an excellent effect that it is possible to prevent extra labor and time from being spent together.

  Moreover, since the insertion member 3 can be inserted over the through-hole F1 of a pair of flange joints F and F, the relative movement of a pair of flange joints F and F can be suppressed. Therefore, the operation of pressing the flange joint F with the pressing member 4 or holding the pair of flange joints F, F with the holding portion 5 can be easily performed.

  And since the position of the press member 4 can be adjusted in a 1st direction, it can respond to the flange joint F of various thickness.

  Note that the joint jig 1 of the present invention is not limited to the above-described embodiment, and various modifications are of course made without departing from the scope of the present invention.

  In the first embodiment and the second embodiment, the description has been made on the assumption that the flange joint F provided on the pipe P is aligned. However, the flange joint F is provided on a pipe other than the pipe P (for example, a valve). Of course, the flange joint F can be aligned.

  In the first embodiment and the second embodiment, it has been described that the position of the pair of flange joints F and F that are simply displaced is described. For example, as illustrated in FIG. As shown in FIG. 8B, a pair of flange joints F and F having different postures can be aligned.

  Also in this case, since the flange joints F and F between the pair of facing portions 20 and 21 can be sandwiched by the sandwiching portion 5 (the pressing member 51 of the sandwiching portion 5), the pair of flange joints F and F that are separated from each other are provided. It is possible to maintain the butted state or prevent the pair of flange joints F and F from being displaced again.

  In the first embodiment and the second embodiment, the pressing member 4 is movable in the second direction (the direction orthogonal to the direction in which the insertion member 3 is inserted into the through hole F1 of the flange joint F). For example, if the flange joint F can be pushed in the second direction, the insertion member 3 is moved in a direction intersecting with the direction of insertion into the through hole F1 of the flange joint F. May be.

  Further, in the first embodiment and the second embodiment, although not particularly mentioned, in order to remove the joint jig from the flange joint F, the pressing member 51 is moved toward the other facing portion 21, What is necessary is just to cancel | release clamping to a pair of flange joints F and F by the pressing member 51 and the one opposing part 20. FIG.

  In the first embodiment, the insertion member 3 can be inserted only into the through hole F1 of the one flange joint F. However, the present invention is not limited to this, and a pair of flanges The joints F and F may be inserted into the through holes F1.

  Moreover, in the said 1st embodiment, although the position in the 1st direction was fixed, the pressing member 4 is not limited to this, For example, the position in a 1st direction can be adjusted now. Also good.

  DESCRIPTION OF SYMBOLS 1 ... Joint jig, 2 ... Base member, 3 ... Insertion member, 4 ... Pressing member, 5 ... Holding part, 6 ... Fixing member, 20, 21 ... Opposing part, 22 ... Consecutive part, 30 ... Male screw part , 31 ... insertion part main body, 32 ... operation part, 33 ... insertion extension part, 34 ... insertion extension part, 40 ... male screw part, 41 ... pressing part, 42 ... operation part, 43 ... tightening Attached part, 50 ... male screw part, 51 ... pressing member, 52 ... operating part, 60 ... male screw part, 61 ... fixing part, 62 ... operating part, 200 ... screw hole, 210 ... screw hole, 220 ... screw hole, 221 ... Long hole, B ... Bolt, F ... Flange joint, F1 ... Through hole, N ... Nut, P ... Pipe

Claims (4)

  A joint jig for aligning the positions of a pair of butted flange joints, a base member having a pair of facing portions facing each other at intervals and a connecting portion connected to each facing portion, and one facing portion An insertion member inserted into the through hole of at least one flange joint in a state where the pair of flange joints are interposed between the pair of opposed portions, and provided in the connecting portion. A joint jig, comprising: a pressing member movable in a direction intersecting with the insertion direction; and a sandwiching portion that sandwiches the pair of flange joints between the pair of opposed portions.   2. The joint jig according to claim 1, wherein the holding portion includes a pressing member that is provided in the other facing portion and is movable in a direction in which the holding portion is in contact with and away from the one facing portion.   3. The joint jig according to claim 1, wherein the insertion member has an insertion portion main body that is switchable between a state where the insertion member is advanced to the other facing portion side and a retracted state with respect to the other facing portion.   The joint jig according to any one of claims 1 to 3, wherein the insertion member is inserted across the through holes of the pair of flange joints.

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