Flange member fixing jig

Abstract

The present invention provides a flange member fixing jig that prevents vibration of the flange member and can stably hold the flange member. [Solution] The flange member fixing jig 2 is for fixing a flange member 1 which comprises a cylindrical pipe body portion 1a and an enlarged diameter portion 1b having an outer diameter larger than the outer diameter of the pipe body portion 1a, and comprises a first member 10 that contacts the enlarged diameter portion 1b from one side of the flange member 1 in the pipe axis direction, and a second member 20 that contacts the enlarged diameter portion 1b from the other side of the flange member 1 in the pipe axis direction.

Description

Technical Field

[0001] The present invention relates to the technology of flange member fixing jigs.

Background Art

[0002] Conventionally, as a joining method for a resin flange member (resin pipe), EF joining (electric fusion joining) is known. EF joining is a joining method in which the flange member and the pipe joint are integrated by heat melting and fusing them. In EF joining, in order to suppress the occurrence of defects during joining, before setting the flange member on the pipe joint, it is necessary to cut the joining portion of the outer peripheral surface of the flange member using a cutting tool as described in Patent Document 1 to remove the oxide film on the outer peripheral surface of the flange member.

[0003] When cutting the outer peripheral surface of the flange member, it is necessary to fix the flange member. Examples of the fixing method for the flange member include a method of placing the flange member on a pedestal and tightening it with a sling belt, a method of inserting the fork of a forklift inside the flange member for fixing, etc. However, in such conventional fixing methods, especially in the case of a large flange, when cutting the outer peripheral surface of the flange member with a cutting tool, vibration may occur in the flange member (movement in which the pipe axis of the flange member becomes inclined vertically, horizontally, and diagonally), and it may not be possible to stably hold the flange member.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] One aspect of this disclosure has been made in view of the above circumstances, and the problem it seeks to solve is to provide a flange member fixing jig that can prevent vibration of the flange member and stably hold the flange member. [Means for solving the problem]

[0006] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.

[0007] That is, a flange member fixing jig according to one aspect of the present disclosure is a flange member fixing jig for fixing a flange member comprising a cylindrical pipe body and an enlarged diameter portion having an outer diameter larger than the outer diameter of the pipe body, the jig comprising a first member that contacts the enlarged diameter portion from one side of the flange member in the pipe axis direction, and a second member that contacts the enlarged diameter portion from the other side of the flange member in the pipe axis direction. According to one aspect of this disclosure, by sandwiching the enlarged diameter portion between the first member and the second member, the vibration of the flange member can be prevented and the flange member can be held stably.

[0008] Furthermore, in one aspect of the present disclosure, the flange member fixing jig is formed longitudinally, and a pair of the first members are arranged parallel to each other and positioned to sandwich the flange member from the radially outer side of the flange member. According to one aspect of this disclosure, the flange member can be held with a simple configuration. Furthermore, the runout of the flange member along the longitudinal direction of the first member can be effectively suppressed.

[0009] Furthermore, in one aspect of the flange member fixing jig according to this disclosure, the second member is formed in a longitudinal shape, and one of the second members is arranged to contact the enlarged diameter portion from the other side. According to one aspect of this disclosure, a flange member can be held with a simple configuration.

[0010] Furthermore, in one embodiment of the flange member fixing jig, the second member is arranged non-parallel to the first member when viewed from the pipe axis direction of the flange member. According to one aspect of this disclosure, the runout of the flange member along the longitudinal direction of the first member and in a direction non-parallel to the longitudinal direction of the first member can be effectively suppressed.

[0011] Furthermore, a flange member fixing jig according to one aspect of the present disclosure further comprises a longitudinally formed third member, the pair of which the third members are arranged parallel to each other and non-parallel to the first member when viewed from the pipe axis direction of the flange member, and are positioned to sandwich the flange member from the radially outer side of the flange member. According to one aspect of this disclosure, the flange member can be held more stably.

[0012] Furthermore, in one embodiment of the flange member fixing jig, the pair of third members are positioned on the flange member, sandwiching the enlarged diameter portion. According to one aspect of this disclosure, the first member, the second member, and the third member can be arranged in a concentrated manner along the pipe axis direction of the flange member (the third member can be placed between the first member and the second member). This makes it less likely for the first member and others to get in the way when performing work using the flange member (such as processing the flange member).

[0013] Furthermore, a flange member fixing jig according to one aspect of the present disclosure further comprises a fourth member that supports at least one of the first member or the second member, so as to be able to adjust the relative positions of the first member and the second member in the pipe axis direction of the flange member. According to one aspect of this disclosure, flange members of various sizes can be held by adjusting the relative positions of the first member and the second member according to the thickness of the enlarged diameter portion.

[0014] In addition, in the flange member fixing jig according to one aspect of the present disclosure, the first member and the second member are formed of a single pipe. According to one aspect of the present disclosure, since a generally circulated material (single pipe) is used, materials can be obtained at a low cost and easily, and the fixing jig can be easily assembled.

[0015] In addition, the flange member fixing jig according to one aspect of the present disclosure further includes leg portions that are grounded on both sides of the flange member in the axial direction of the pipe of the flange member and on both sides of the flange member in the radial direction of the flange member. According to one aspect of the present disclosure, the flange member can be stably supported.

[0016] In addition, in the flange member fixing jig according to one aspect of the present disclosure, the lower end portions of the leg portions are embedded in the ground. According to one aspect of the present disclosure, the flange member fixing jig can be firmly fixed. As a result, the flange member can be stably held against the weight of the flange member and the load due to the work.

Effects of the Invention

[0017] According to one aspect of the present disclosure, it is possible to prevent the flange member from swaying and stably hold the flange member.

Brief Description of the Drawings

[0018] [Figure 1] (a) Front view showing a flange member that is a fixing target of the flange member fixing jig according to the first embodiment of the present disclosure. (b) Cross-sectional view taken along line A-A thereof. [Figure 2] Front view showing the flange member fixing jig according to the first embodiment of the present disclosure. [Figure 3] Left side view showing the flange member fixing jig according to the first embodiment of the present disclosure. [[ID=X]]

Modes for Carrying Out the Invention

[0019] Hereinafter, the directions indicated by the arrows U, D, F, B, L, and R in the drawings will be defined as the upward, downward, forward, backward, leftward, and rightward directions, respectively, for the description.

[0020] The flange member fixing jig 2 according to this embodiment is for fixing the flange member 1. For example, the flange member fixing jig 2 is used when cutting the joint portion on the outer peripheral surface of the flange member 1 using a cutting tool in the EF joint of the flange member 1.

[0021] The flange member 1 is a resin pipe. As shown in FIG. 1, the flange member 1 includes a pipe body portion 1a formed in a cylindrical shape and a diameter-expanded portion 1b having an outer diameter larger than the outer diameter of the pipe body portion 1a. The diameter-expanded portion 1b is formed at the axial end portion of the pipe body portion 1a in the pipe axis direction. In the illustrated example, the flange member 1 is shown such that the diameter-expanded portion 1b is located at the front end portion of the pipe body portion 1a. When performing the EF joint, the outer peripheral surface of the pipe body portion 1a is cut to a position separated by a predetermined length from the rear end portion (the end portion opposite to the diameter-expanded portion 1b).

[0022] The flange member fixing jig 2 is used when cutting the outer peripheral surface of the flange member 1 formed as described above, and is formed so as to be able to fix the flange member 1. Hereinafter, the configuration of the flange member fixing jig 2 will be described with reference to FIGS. 1 to 3. The flange member fixing jig 2 includes a first member 10, a second member 20, a third member 30, a first clamp 31, a fourth member 40, a second clamp 41, a third clamp 42, a fifth member 50, a fourth clamp 51, a leg portion 60, and a fifth clamp 61.

[0023] The first member 10 is a member for fixing the flange member 1. The first member 10 is formed in a longitudinal shape and is provided with its longitudinal direction oriented in the vertical direction. In this embodiment, the first member 10 is formed of a single pipe. As shown in FIG. 2, a pair of first members 10 are provided on the left and right of the flange member 1. The pair of first members 10 are arranged parallel to each other. The lower end portion of the first member 10 is provided so as to be grounded to the ground.

[0024] The first member 10 is provided so as to contact the enlarged diameter portion 1b from one side in the pipe axis direction of the flange member 1. In this embodiment, as shown in Figures 1(b) and 3, the first member 10 is provided so as to contact the enlarged diameter portion 1b from the rear side.

[0025] The pair of first members 10 are provided on the radially outer side of the flange member 1, sandwiching the flange member 1. In this embodiment, as shown in Figures 1(b) and 2, the left first member 10 is provided so as to contact the pipe body 1a from the left side. The right first member 10 is provided so as to contact the pipe body 1a from the right side.

[0026] The second member 20 is a member for fixing the flange member 1. The second member 20 is formed in an elongated shape. In this embodiment, the second member 20 is formed from a single pipe. The second member 20 is formed to be longer than the outer diameter of the flange member 1.

[0027] The second member 20 is fixed to the first member 10 via a fourth member 40, which will be described later. The second member 20 is provided so as to be in contact with the enlarged diameter portion 1b from the other side in the pipe axis direction of the flange member 1. In this embodiment, the second member 20 is provided so as to be in contact with the enlarged diameter portion 1b from the front side. A flexible member (for example, a rubber member) may be provided between the second member 20 and the enlarged diameter portion 1b to prevent the second member 20 from scratching the front surface of the enlarged diameter portion 1b.

[0028] The second member 20 is positioned non-parallel to the first member 10 when viewed from the pipe axis direction of the flange member 1. Furthermore, the second member 20 is positioned non-perpendicular to the first member 10 when viewed from the pipe axis direction of the flange member 1. Specifically, as shown in Figure 2, the second member 20 is positioned diagonally with respect to the left-right direction in a front view. In this embodiment, the second member 20 is positioned such that its right end is above its left end.

[0029] The first member 10 and the second member 20, formed in this manner, are positioned to sandwich the enlarged diameter portion 1b of the flange member 1 from the front and back.

[0030] The third member 30 is a member for fixing and supporting the flange member 1. The third member 30 is formed in a longitudinal shape. In this embodiment, the third member 30 is formed from a single pipe. The third member 30 is positioned non-parallel to the first member 10 when viewed from the pipe axis direction of the flange member 1. In this embodiment, as shown in Figure 2, the third member 30 is provided with its longitudinal direction facing left to right. That is, the third member 30 is formed perpendicular to the first member 10 when viewed from the front.

[0031] A pair of third members 30 are provided, one above the other. The pair of third members 30 are arranged parallel to each other. The upper third member 30 is formed to be longer than the left-right distance between the pair of first members 10. The lower third member 30 is formed to be longer than the upper third member 30.

[0032] The third member 30 is fixed to the first member 10 by the first clamp 31. The pair of third members 30 are positioned to sandwich the flange member 1 from the radially outer side of the flange member 1. In this embodiment, the upper third member 30 is provided so as to contact the enlarged diameter portion 1b from above. The lower third member 30 is provided so as to contact the enlarged diameter portion 1b from below. The lower third member 30, provided in this manner, plays a role in supporting the flange member 1 from below.

[0033] The pair of third members 30 formed in this manner are positioned to sandwich the enlarged diameter portion 1b of the flange member 1 from above and below.

[0034] The fourth member 40 is a member that supports the second member 20. The fourth member 40 is formed longitudinally and is provided with its longitudinal direction facing the front-rear direction. In this embodiment, the fourth member 40 is formed from a single pipe. A pair of fourth members 40 are provided on the left and right sides of the flange member 1. As shown in Figure 3, the rear end of the fourth member 40 is fixed to the first member 10 by a second clamp 41. The fourth member 40 is provided so as to extend forward from the first member 10. Furthermore, the fourth member 40 supports the second member 20 by a third clamp 42 in front of the second clamp 41.

[0035] Thus, the fourth member 40 supports at least one of the first member 10 or the second member 20 so that the relative positions of the first member 10 and the second member 20 in the pipe axis direction of the flange member 1 can be adjusted. Specifically, the distance between the first member 10 and the second member 20 in the front-rear direction can be adjusted by adjusting the front-rear position of the third clamp 42. Therefore, even if the flange member 1 has different front-rear widths for the enlarged diameter portion 1b, it can be sandwiched between the first member 10 and the second member 20.

[0036] The fifth member 50 supports the lower third member 30 and is a member for fixing the leg portion 60, which will be described later. The fifth member 50 is formed in a longitudinal shape and is provided with its longitudinal direction facing the front-rear direction. In this embodiment, the fifth member 50 is formed from a single pipe. As shown in Figure 2, a pair of fifth members 50 are provided on the left and right sides of the flange member 1. The pair of fifth members 50 are arranged parallel to each other. In the left-right direction, the fifth members 50 are positioned outside the first member 10.

[0037] The fifth member 50 is formed to be longer than the length of the flange member 1 in the pipe axis direction. As shown in Figure 2, the right fifth member 50 is positioned to the right of the flange member 1, and the left fifth member 50 is positioned to the left of the flange member 1. Also, as shown in Figure 3, the fifth member 50 is positioned such that its front end is in front of the front surface of the flange member 1, and its rear end is behind the rear surface of the flange member 1. The fifth member 50 is fixed to the lower third member 30 by the fourth clamp 51 below the lower third member 30.

[0038] The leg portion 60 is a member that supports the fifth member 50. The leg portion 60 is formed in a longitudinal shape and is provided with its longitudinal direction facing up and down. In this embodiment, the leg portion 60 is formed from a single pipe. A total of four leg portions 60 are provided on the flange member 1: one pair on the left and one on the right, and one pair on the front and one on the back. The leg portion 60 is fixed to the fifth member 50 by the fifth clamp 61. The lower end of the leg portion 60 is embedded in the ground.

[0039] The legs 60 are provided to make contact with the ground on both sides (outside) of the flange member 1 in the pipe axis direction, and on both sides (outside) of the flange member 1 in the radial direction. Specifically, the front pair of legs 60 are provided to make contact in front of the flange member 1, and the rear pair of legs 60 are provided to make contact behind the flange member 1. In addition, the right pair of legs 60 are provided to make contact to the right of the flange member 1, and the left pair of legs 60 are provided to the left of the flange member 1.

[0040] The provision of the legs 60 allows the flange member 1 to be positioned at a height that is easy for the worker to work at. Furthermore, by adjusting the vertical position of the fifth clamp 61, the height of the fifth member 50 and the lower third member 30 supported by the fifth member 50 can be adjusted, and consequently, the height of the flange member 1 supported by the lower third member 30 can be set to a height that is easy for the worker to work at. In addition, since the four legs 60 are each in contact with the outside of the flange member 1, the flange member 1 can be stably supported.

[0041] The assembly method for the flange member fixing jig 2 is described below. Note that the method described below is merely one example, and the flange member fixing jig 2 can be assembled by rearranging the steps as appropriate.

[0042] First, the four legs 60 are positioned in their respective locations. Then, each leg 60 is driven into the ground so that its lower end is embedded in the ground. Next, the pair of left and right fifth members 50 are fixed to each leg 60 so as to span across the front and rear legs 60. The legs 60 and the fifth members 50 are connected by a fifth clamp 61. Alternatively, the fifth members 50 and the legs 60 may be fixed first, and then each leg 60 may be driven into the ground.

[0043] Next, the first member 10, the second member 20, the third member 30, and the fourth member 40 are assembled. For example, the lower third member 30 is fixed to the fifth member 50 so as to span across the left and right fifth members 50. The fifth member 50 and the lower third member 30 are connected by the fourth clamp 51. Then, the flange member 1 is held by a crane or the like with the enlarged diameter portion 1b resting on the lower third member 30.

[0044] Next, the left and right pair of first members 10 are fixed to the lower third member 30 at a position where they are in contact with the enlarged diameter portion 1b and the pipe body portion 1a of the flange member 1. The lower third member 30 and the first member 10 are connected by the first clamp 31. Next, the left and right pair of fourth members 40 are fixed to the first member 10. The first member 10 and the fourth member 40 are connected by the second clamp 41. Next, the second member 20 is fixed to the fourth member 40 at a position where it is in contact with the enlarged diameter portion 1b. The fourth member 40 and the second member 20 are connected by the third clamp 42. Next, the upper third member 30 is fixed to the first member 10 so as to span both the left and right first members 10 at a position where it is in contact with the enlarged diameter portion 1b.

[0045] In this way, the flange member fixing jig 2 can be assembled to fix the flange member 1. At this time, by driving the legs 60 that are in contact with the ground into the ground and assembling the frame, the flange member fixing jig 2 can be firmly fixed to the ground against the weight of the flange member 1 and the load from the work.

[0046] The flange member fixing jig 2, configured as described above, is designed so that the first member 10 and the second member 20 clamp the enlarged diameter portion 1b of the flange member 1 from both directions along the pipe axis (front and rear directions). Therefore, it is possible to suppress the runout of the flange member 1 that occurs when the outer surface of the flange member 1 is cut with a cutting tool, and to stably hold the flange member 1. Furthermore, the flange member fixing jig 2 is configured so that the pipe body portion 1a is clamped from the radially outer side (left and right directions) of the flange member 1 by a pair of first members 10. By clamping the flange member 1 from both the front and rear directions and the left and right directions in this way, the runout of the flange member 1 (especially large flange member 1) can be further suppressed.

[0047] By suppressing the runout of the flange member 1 in this way, the quality of the cut surface of the flange member 1 can be improved, and consequently, the quality of the pipeline formed by the EF-joined flange member 1 can be improved. In addition, since the flange member fixing jig 2 can be fixed without the flange surface (the front surface of the enlarged diameter portion 1b) coming into contact with the ground, scratches on the flange surface can be suppressed.

[0048] Furthermore, since the second member 20, which contacts the enlarged diameter portion 1b from the front, is positioned non-parallel to the first member 10 in a front view, it can effectively suppress the vibration of the flange member 1 in the longitudinal direction (vertical direction) of the first member 10 and in directions non-parallel to the longitudinal direction of the first member 10. In addition, by providing only one second member 20 and positioning it non-perpendicular to the first member 10 in a front view, it is possible to suppress the vibration of the flange member 1 in various directions with a simple configuration.

[0049] Furthermore, the flange member fixing jig 2 is configured to clamp the flange member 1 from above and below using a pair of third members 30. This further suppresses vertical vibration of the flange member 1. In addition, since the third members 30 are fixed to each of the pair of first members 10, vibration of the first members 10 can be prevented.

[0050] Furthermore, the third member 30 is positioned between the first member 10 and the second member 20 in the front-rear direction, and is configured to sandwich the flange member 1 (enlarged diameter portion 1b). Therefore, the first member 10, the second member 20, and the third member 30 can be arranged together on the opposite side (the enlarged diameter portion 1b side) from the rear end of the flange member 1 where cutting is performed. Thus, even if the total length (length in the pipe axis direction) of the flange member 1 is relatively short, the cutting allowance on the outer surface of the flange member 1 and the range of motion of the cutting tool can be secured.

[0051] Furthermore, each component of the flange member fixing jig 2 is made up of separate members, and each is fixed by a clamp to form a frame. Therefore, by adjusting the position of the clamps, the spacing between each component can be adjusted according to the size of the flange member 1. Thus, flange members 1 of various sizes can be fixed.

[0052] Furthermore, since each component of the flange member fixing jig 2 is made of commonly available materials (single-pipe scaffolding), the materials can be obtained inexpensively and easily, and the flange member fixing jig 2 can be easily assembled.

[0053] As described above, the flange member fixing jig 2 according to this embodiment is A flange member fixing jig 2 for fixing a flange member 1 comprising a cylindrical pipe body portion 1a and an enlarged diameter portion 1b having an outer diameter larger than the outer diameter of the pipe body portion 1a, From one side of the flange member 1 in the pipe axis direction, a first member 10 that contacts the enlarged diameter portion 1b, From the other side of the flange member 1 in the pipe axis direction, a second member 20 is in contact with the enlarged diameter portion 1b, It is equipped with the following features.

[0054] By configuring it in this way, the enlarged diameter portion 1b is sandwiched between the first member 10 and the second member 20, preventing the flange member 1 from wobbling and allowing the flange member 1 to be held stably.

[0055] Furthermore, the first member 10 is formed in an elongated shape, The pair of first members 10 are arranged parallel to each other and are positioned on either side of the flange member 1 from the radially outer side of the flange member 1.

[0056] By configuring it in this way, the flange member 1 can be held with a simple structure. Furthermore, the vibration of the flange member 1 along the longitudinal direction of the first member 10 can be effectively suppressed.

[0057] Furthermore, the second member 20 is formed in an elongated shape, One of the second members 20 is positioned so as to be in contact with the enlarged diameter portion 1b from the other side.

[0058] By configuring it in this way, the flange member 1 can be held with a simple structure.

[0059] Furthermore, the second member 20 is The flange member 1 is positioned non-parallel to the first member 10 when viewed from the direction of the pipe axis.

[0060] By configuring it in this way, the vibration of the flange member 1 along the longitudinal direction of the first member 10 and along directions not parallel to the longitudinal direction of the first member 10 can be effectively suppressed.

[0061] Furthermore, the flange member fixing jig 2 according to this embodiment is It further comprises a third member 30 formed in an elongated shape, The pair of third members 30 are arranged parallel to each other and non-parallel to the first member 10 when viewed from the pipe axis direction of the flange member 1, and are positioned on either side of the flange member 1 from the radially outer side.

[0062] This configuration allows for more stable holding of the flange member 1.

[0063] Furthermore, the pair of third members 30 are This is the flange member 1 that is positioned to sandwich the enlarged diameter portion 1b.

[0064] By configuring it in this way, the first member 10, the second member 20, and the third member 30 can be arranged in a concentrated manner along the pipe axis direction of the flange member 1 (the third member 30 can be placed between the first member 10 and the second member 20). This makes it less likely for the first member 10, etc., to get in the way when performing work using the flange member 1 (such as processing the flange member 1).

[0065] Furthermore, the flange member fixing jig 2 according to this embodiment is The flange member 1 further comprises a fourth member 40 that supports at least one of the first member 10 or the second member 20, so as to be able to adjust the relative positions of the first member 10 and the second member 20 in the pipe axis direction of the flange member 1.

[0066] By configuring it in this way, the relative positions of the first member 10 and the second member 20 can be adjusted according to the thickness of the enlarged diameter portion 1b, thereby enabling the holding of flange members 1 of various sizes.

[0067] Furthermore, the first member 10 and the second member 20 are formed from single-pipe scaffolding.

[0068] By configuring it in this way, since commonly available materials (single-pipe scaffolding) are used, the materials can be obtained cheaply and easily, and the flange member fixing jig 2 can be easily assembled.

[0069] Furthermore, the flange member fixing jig 2 according to this embodiment is The flange member 1 is further provided with legs 60 that make contact with the ground on both sides of the flange member 1 in the pipe axis direction and on both sides of the flange member 1 in the radial direction.

[0070] This configuration allows for stable support of the flange member 1.

[0071] Furthermore, the lower end of the leg portion 60 is It is embedded in the ground.

[0072] This configuration allows the flange member fixing jig 2 to be firmly secured. This ensures that the flange member 1 is held stably against the weight of the flange member 1 and the loads incurred during the work.

[0073] Although embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention as described in the claims.

[0074] For example, in this embodiment, each member such as the first member 10 is made of a single pipe, but it may also be made of a square pipe.

[0075] Furthermore, in this embodiment, the pair of first members 10 sandwich the flange member 1 from the left and right directions, but the direction of sandwiching by the first members 10 is not limited to the left and right directions and can be any direction. Also, the pair of third members 30 sandwich the flange member 1 from the top and bottom directions, but the direction of sandwiching by the third members 30 is not limited to the top and bottom directions and can be any direction different from (non-parallel to) the sandwiching direction by the first members 10.

[0076] Furthermore, in this embodiment, the second member 20 is positioned not perpendicular to the first member 10 (diagonally with respect to the left-right direction) when viewed from the front, but it may also be positioned perpendicular to the first member 10. Also, in this embodiment, only one second member 20 is provided, but there may be multiple second members 20. When multiple second members 20 are provided, each second member 20 may be positioned parallel to the others, or non-parallel to the others.

[0077] Furthermore, in this embodiment, the third member 30 is positioned to be in contact with the enlarged diameter portion 1b, but it may also be positioned to be in contact with the main body portion 1a. In this case, for example, the first member 10 and the third member 30 may each be formed in a frame shape with the same front-to-back position.

[0078] Furthermore, the flange member 1 and the flange member fixing jig 2 may be connected using a belt or the like as appropriate.

[0079] Furthermore, in this embodiment, the flange member fixing jig 2 is used during the cutting operation of the outer surface of the flange member 1 in EF joining, but it can also be used during other operations (for example, fusion welding of pipe joints).

[0080] Furthermore, the structure of the leg portion 60 is not particularly limited to that of this embodiment; it may be made of a single pipe (placed directly on the ground) or it may be a jack base with adjustable height. If the ground is sand or soil, it is preferable to bury the single pipe so that it can be securely fixed. If there is a jack base, work can be performed even if the ground is sloped. [Explanation of Symbols]

[0081] 1. Flange member 1a Pipe body 1b Expanded diameter part 2. Flange member fixing jig 10 First component 20 Second component 30 Third Member 40 Fourth member 50 Fifth member 60 Legs

Claims

1. A flange member fixing jig for fixing a flange member comprising a cylindrical pipe body and an enlarged diameter portion having an outer diameter larger than the outer diameter of the pipe body, From one side of the flange member in the pipe axis direction, a first member in contact with the enlarged diameter portion, From the other side of the flange member in the pipe axis direction, a second member in contact with the enlarged diameter portion, A flange member fixing jig comprising the following:

2. The first member is formed in a longitudinal shape, A pair of the first members are arranged parallel to each other and are positioned on either side of the flange member from the radially outer side of the flange member, The flange member fixing jig according to claim 1.

3. The second member is formed in a longitudinal shape, One of the second members is positioned so as to be in contact with the enlarged diameter portion from the other side. The flange member fixing jig according to claim 2.

4. The second member is, When viewed from the pipe axis direction of the flange member, it is arranged non-parallel to the first member, The flange member fixing jig according to claim 3.

5. It further comprises a third member formed in a longitudinal shape, The pair of third members are arranged parallel to each other and non-parallel to the first member when viewed from the pipe axis direction of the flange member, and are positioned on either side of the flange member from the radially outer side. The flange member fixing jig according to claim 2.

6. The pair of third members are, Of the flange members, the following are positioned to sandwich the enlarged diameter portion: The flange member fixing jig according to claim 5.

7. The flange member further comprises a fourth member that supports at least one of the first member or the second member, so that the relative positions of the first member and the second member in the pipe axis direction of the flange member can be adjusted. The flange member fixing jig according to claim 1.

8. The first member and the second member are formed from single pipes. The flange member fixing jig according to claim 1.

9. The flange member further comprises legs that make contact with the ground on both sides of the flange member in the pipe axis direction and on both sides of the flange member in the radial direction. A flange member fixing jig according to any one of claims 1 to 8.

10. The lower end of the leg portion is Embedded in the ground, The flange member fixing jig according to claim 9.

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