Pipe flange mounting jig and pipe flange mounting method

Abstract

The objective is to provide a pipe flange mounting jig and pipe flange mounting method that streamline the process of ensuring the right angle of the flange to the pipe, while also ensuring stable quality. [Solution] When attaching a flange F to a pipe P using the pipe flange mounting jig 1, first the flange F is fixed to the back surface of the base part 10 with bolts 40. Then, with the pipe P inserted into the insertion hole S, it is fixed with the pipe fixing part 20. At this time, the flange F is positioned perpendicular to the axis of the pipe P. Then, by fixing the pipe P and the flange F by welding in this state, the flange F is fixed to the pipe P in an accurately aligned state.

Description

Technical Field

[0001] The present invention relates to a pipe flange mounting jig and a pipe flange mounting method. Specifically, it relates to a pipe flange mounting jig and a pipe flange mounting method that can improve the efficiency of the right-angled operation of the flange with respect to the pipe and ensure stable quality.

Background Art

[0002] There are various types of pipes, such as water supply and drainage pipes for supplying and draining domestic water in buildings, gas pipes for supplying fuels such as city gas and propane gas, or process pipes for transporting raw materials in chemical plants, etc., depending on the type of fluid, the use environment, and the purpose. And such pipes are separated into a plurality of pipes so that they can be easily separated or connected during maintenance such as inspection, repair, and replacement. The flanges of the pipes are abutted against each other, and the flanges are firmly connected by tightening them with bolts and nuts.

[0003] For example, Patent Document 1 discloses a pipe connection jig having a top plate and a bottom plate that are arranged opposite to each other and integrally formed by a connecting plate, and notch portions are formed on the top plate and the bottom plate so that the flanges of the pipes on one side and the flanges of the pipes on the other side can be accommodated. According to such Patent Document 1, by accommodating the opposing flanges in the notch portions respectively, it becomes possible to connect the flanges to each other while holding the pipes on one side and the pipes on the other side, so that the workability during pipe connection can be improved.

Prior Art Documents

Patent Documents

[0004] <着

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, when connecting multiple pipes with flanges, it is necessary to maintain a high degree of airtightness at the joint surface of the flanges of one pipe and the other pipe in order to prevent leakage of fluid passing through the pipes and to enhance safety. For this reason, the mounting angle of the flange with respect to the axis of the pipe must be exactly 90 degrees (right angle).

[0006] Traditionally, flange installation on pipes was performed using specialized tools such as flange squares. Specifically, to ensure perpendicularity across the entire circumference of the flange, the flange square was rotated 90 degrees in the circumferential direction of the flange, and workers visually checked from at least four directions to ensure there were no gaps between the blade of the flange square and the welded surface of the flange temporarily attached to the pipe.

[0007] However, the conventional method required manually ensuring each flange was perpendicular, which was time-consuming and inefficient. Furthermore, it depended on the skill and attention of the workers, resulting in inconsistent quality; even slight deviations could cause significant problems during subsequent pipe connections. Additionally, working at heights or in confined spaces presented safety challenges due to the difficulty of accurate measurement using specialized tools.

[0008] The present invention was devised in view of the above points, and relates to a pipe flange mounting jig and a pipe flange mounting method that can streamline the process of ensuring the right angle of the flange to the pipe and ensure stable quality. [Means for solving the problem]

[0009] To achieve the above objective, the pipe flange mounting jig of the present invention is a jig for mounting a flange to a pipe, comprising: a plate-shaped base portion having a through hole through which the pipe can be inserted; a pipe fixing portion integrated with the surface of the base portion for fixing the pipe inserted through the through hole at a right angle to the surface of the base portion; and a flange fixing portion for overlapping and fixing the flange on the back surface of the base portion, wherein the pipe is fixed by the pipe fixing portion and the flange is fixed by the flange fixing portion, and the flange is positioned at a right angle to the pipe.

[0010] Herein, the pipe flange mounting jig of the present invention comprises a plate-shaped base portion having an insertion hole through which a pipe can be inserted, and a pipe fixing portion integrated with the surface of the base portion for fixing the pipe inserted through the insertion hole at a right angle to the surface of the base portion. As a result, the pipe to which the flange is attached can be firmly fixed while maintaining a right angle to the surface of the base portion.

[0011] Furthermore, by providing a flange fixing section on the back of the base for overlapping and securing flanges, the flange to be attached to the piping can be integrated with the back of the base. As a result, the flange and the piping fixed by the pipe fixing section are kept at a right angle.

[0012] As described above, by welding the pipe and flange fixed to the pipe flange mounting jig, the mounting angle of the flange with respect to the pipe axis can be fixed in a state where it is precisely perpendicular.

[0013] Furthermore, if the base is formed in a circular shape, the flange is also circular, so simply checking whether the gap around the outer circumference of both is uniform allows for an intuitive understanding of whether the flange is precisely perpendicular to the pipe. This visual confirmation enables a quick and reliable final check before welding, allowing workers to perform highly accurate alignment by visual inspection alone, without the need for complex measuring equipment, thus contributing to reduced working time and improved quality.

[0014] Furthermore, if the insertion hole formed in the base is a slit hole formed radially from the center of the base, insertion and removal of the pipe into and from the base becomes easier, and since it is not necessary to pass one end of the pipe through the insertion hole in the base, the jig can be attached to a position in the middle of the pipe, even in cases where it is not possible to pass the pipe from the end, such as with existing pipes.

[0015] Furthermore, if the pipe fixing part is a clamp with a tightening mechanism, a magnet that attracts and fixes the pipe, or a groove formed to match the shape of the pipe, selecting from these fixing methods allows for meeting various on-site needs and enabling more efficient use of the jig.

[0016] Furthermore, if the pipe fixing section is fixed to the base section via a plate that is perpendicular to the base section, the pipe fixing section can securely fix the pipe to the base section in a stable manner. Moreover, this plate not only fixes the pipe fixing section to the base section, but also functions as a reference surface for placing measuring instruments such as spirit levels when the pipe is installed. By placing a spirit level on the surface of this plate, the worker can visually and quantitatively confirm whether the pipe is fixed precisely perpendicular to the surface of the base section.

[0017] Furthermore, when the flange fixing section consists of a second bolt hole formed in a position that aligns with the first bolt hole formed circumferentially on the flange when the flange is superimposed on the back surface of the base section, and a bolt that passes through the first and second bolt holes to fix the flange to the base section, the flange and the base section are physically joined, effectively preventing the flange from moving or shifting during welding. In addition, since the position of the bolt holes is predetermined, the flange can be fixed accurately in the same position every time. This reduces errors caused by the worker and enables welding work of consistently stable quality.

[0018] To achieve the above objective, the present invention provides a method for attaching a pipe flange to a pipe using a pipe flange mounting jig comprising a plate-shaped base portion having a through-hole through which a pipe can be inserted, a pipe fixing portion integrated on the surface of the base portion, and a flange fixing portion on the back surface of the base portion for overlapping and fixing the flange, the method comprising the steps of fixing the flange to the back surface of the base portion with the flange fixing portion, inserting the pipe through the through-hole and fixing it with the pipe fixing portion so that the axis of the pipe is perpendicular to the surface of the base portion, and welding the flange to the pipe while the axis of the pipe and the flange are kept perpendicular by the pipe flange mounting jig.

[0019] Through the above process, the pipe and flange are fixed at a right angle via the jig, eliminating concerns about misalignment during welding. This ensures accuracy in the flange's mounting angle to the pipe, improving welding quality. Furthermore, since the pipe flange mounting jig handles positioning and fixing, the worker only needs to set the pipe and flange in the jig and weld, significantly reducing working time and ensuring consistent quality regardless of the worker's skill level. In addition, because the pipe flange mounting jig securely fixes the pipe and flange, the risk of parts becoming unstable during welding is reduced, improving worker safety. [Effects of the Invention]

[0020] The pipe flange mounting jig and pipe flange mounting method according to the present invention streamline the process of ensuring the flange is perpendicular to the pipe, while also ensuring stable quality. [Brief explanation of the drawing]

[0021] [Figure 1] This is a front perspective view of a pipe flange mounting jig according to an embodiment of the present invention. [Figure 2] This is a rear perspective view of a pipe flange mounting jig according to an embodiment of the present invention. [Figure 3] It is a diagram for explaining a method of using a pipe flange mounting jig according to an embodiment of the present invention. [Figure 4] It is a diagram showing a state where a flange is attached to a pipe using a pipe flange mounting jig according to an embodiment of the present invention.

Embodiments for Carrying out the Invention

[0022] Hereinafter, a pipe flange mounting jig and a pipe flange mounting method according to an embodiment of the present invention will be described in detail with reference to the drawings to facilitate understanding of the present invention. In the following description, unless otherwise specified, the mounting angle with respect to the pipe means the mounting angle with respect to the axis of the pipe.

[0023] [Pipe Flange Mounting Jig] First, the pipe flange mounting jig 1 according to an embodiment of the present invention will be described based on FIGS. 1 to 3. The pipe flange mounting jig 1 mainly includes a base portion 10, a pipe fixing portion 20, and a flange fixing portion 30. Hereinafter, the details of each component will be described.

[0024] The base portion 10 is disk-shaped, and the pipe fixing portion 20 described later is attached to the surface. The back surface is finished to be a flat surface, and a substantially U-shaped slit-like insertion hole S is formed along the radial direction from the approximate center to the outer periphery of the base portion 10. This insertion hole S is for sliding the pipe P through from the lateral direction with respect to the pipe flange mounting jig 1.

[0025] Here, the base portion 10 does not necessarily have to be disc-shaped. However, since the flange F attached to the pipe P is also usually circular, it becomes easier to visually confirm the concentricity (coincidence of centers) when the flange F is attached to the base portion 10. Furthermore, by matching the outer diameter of the base portion 10 with the outer diameter of the flange F, when the flange F is attached to the base portion 10, it is possible to intuitively understand whether the flange F is positioned precisely perpendicular to the pipe P simply by checking whether the gap around the outer circumference of both is uniform. Therefore, a final check before welding can be performed quickly and reliably by visual confirmation, allowing workers to perform highly accurate alignment by visual inspection alone without using complex measuring equipment, contributing to reduced working time and improved quality.

[0026] Furthermore, the through-hole S for passing the pipe P through the base portion 10 does not necessarily have to be slit-shaped; it may be a through-hole formed at any position in the base portion 10. However, if the through-hole S is slit-shaped, insertion and removal of the pipe P into and from the base portion 10 becomes easier, and it is not necessary to pass one end of the pipe P through the through-hole S in the base portion 10. Therefore, even in cases where it is not possible to pass the end of the pipe P through the through-hole S, such as with existing piping, the pipe flange mounting jig 1 can be attached to a position in the middle of the pipe P.

[0027] A pipe fixing part 20 is provided on the surface of the base part 10 for fixing the pipe P inserted into the insertion hole S of the base part 10 in a predetermined position. The pipe fixing part 20 is a clamp mechanism consisting of an openable and closable arm 21 and a nut 22 for tightening and fixing the arm 21. By sandwiching the pipe P inserted into the insertion hole S between the arms 21 of the clamp and turning the nut 22 to tighten it, the pipe P can be firmly gripped.

[0028] Here, the pipe fixing part 20 is not necessarily limited to a clamp mechanism. For example, other fixing means may be used, such as a means of attracting and fixing the pipe P with a magnet, or a means of fitting and fixing the pipe P into a groove formed to match the shape of the pipe.

[0029] The pipe fixing section 20 is welded to the surface of the base section 10 via a flat plate 23 that is perpendicular to the base section 10. Therefore, the pipe fixing section 20 can securely fix the pipe P to the base section 10 at a right angle without the clamp wobbling when fixing the pipe P. Furthermore, this plate 23 not only fixes the pipe fixing section 20 to the base section 10, but also functions as a reference surface for placing measuring instruments such as a spirit level when the pipe P is installed.

[0030] When fixing the pipe P with the pipe fixing part 20, the worker can place a spirit level on the surface of the plate 23 to visually and quantitatively confirm whether the pipe P is fixed precisely perpendicular to the surface of the base part 10. This prevents tilting of the flange F after welding and enables highly accurate construction. Thus, the plate 23 is both a structural part of the pipe flange mounting jig 1 and a measurement reference point that assists in accurate positioning.

[0031] Next, the fixing structure of the flange F to be attached to the pipe flange mounting jig 1 will be described. Typically, the flange F has bolt holes (first bolt holes H1) evenly formed along the circumferential direction in order to firmly connect with the other flange. The flange F is fixed to the back surface of the base portion 10 using these first bolt holes H1.

[0032] Specifically, a second bolt hole H2 is formed on the back surface of the base portion 10 at a position that coincides with the first bolt hole H1. Then, with the flange F placed on top of the back surface of the base portion 10, the positions of the first bolt hole H1 and the second bolt hole H2 are aligned and the flange is tightened and fixed with bolt 40. The second bolt hole H2 and bolt 40 together are referred to as the flange fixing portion 30.

[0033] Here, the flange fixing portion 30 is not necessarily limited to fixing by bolts and nuts. For example, if the material of the flange F is a magnetic material, the flange F can be fixed to the back surface of the base portion 10 by magnetic material by making the back surface of the base portion 10 a magnetic material.

[0034] Alternatively, a cylindrical spring pin with an axial notch may be provided in the first bolt hole H1 of the flange F, so that when the flange F is placed on the back surface of the base portion 10, the spring pin automatically fits into the second bolt hole H2, completing both positioning and temporary fastening simultaneously.

[0035] Furthermore, although the second bolt hole H2 is a through hole that penetrates the base portion 10, it may also be a blind hole with a bottom. Note that the number of second bolt holes H2 may be fewer than the number of first bolt holes H1 formed in the flange F (four in this embodiment).

[0036] The above describes the configuration of the pipe flange mounting jig 1 according to an embodiment of the present invention. However, for pipes P and flanges F of various sizes, a pipe flange mounting jig 1 suitable for each can be prepared and used. Furthermore, by adding a screw-type or lever-type size adjustment function to the pipe flange mounting jig 1, it is possible to accommodate pipes P and flanges F of various sizes with a single pipe flange mounting jig 1.

[0037] [How to use the pipe flange mounting jig] Next, we will explain how to attach flange F to pipe P using pipe flange mounting jig 1.

[0038] (Step 1: Flange fixing) With the flange F placed on the back surface of the base portion 10, the first bolt hole H1 formed in the flange F and the second bolt hole H2 formed in the base portion 10 are aligned and secured by tightening with bolts 40. At this time, visually check for any gaps between the flange F and the base portion 10. If there are gaps, one of the bolts 40 may be loose, so tighten the loose bolt 40 until there are no gaps between the flange F and the base portion 10.

[0039] (Step 2: Piping alignment) Next, insert the pipe P into the slit-shaped insertion hole S of the base portion 10 to which the flange F is fixed. At this time, it is preferable to set the base portion 10 so that the insertion hole S is directed vertically upward. Then, carefully insert the pipe P vertically downward while adjusting the depth so that the end of the pipe P is in the correct position on the flange F, and once the axis of the pipe P and the center of the flange F are aligned, slide the pipe slightly until the end of the pipe P and the flange are flush.

[0040] (Step 3: Fixing the pipes) Once the positional relationship between pipe P and flange F has been adjusted in step 2, pipe P is inserted through the insertion hole S and then secured by clamping it between the arms 21 of the clamp and tightening the nut 22. At this stage, the pipe flange mounting jig 1 precisely aligns the flange F so that it is perpendicular to pipe P.

[0041] (Step 4: Temporary welding of pipes and flanges) In step 3, once the pipe P and flange F are precisely aligned, they are tack-welded together using methods such as welding or brazing.

[0042] (Step 5: Final welding of pipes and flanges) Next, the bolts 40 and pipe fixing parts 20 that secured the pipe flange mounting jig 1 are loosened and removed. At this point, as shown in Figure 4, the flange F is correctly fixed to the pipe P at a predetermined right angle. After that, a final check is performed to ensure there is no misalignment or distortion due to tack welding, and the main welding is completed, thus concluding the series of operations.

[0043] The above describes the process of attaching a flange F to a pipe P using the pipe flange mounting jig 1 according to an embodiment of the present invention. However, the order of steps 1 to 3 can be changed as appropriate. For example, the pipe P may be inserted into the base portion 10 and fixed, then the flange F may be attached, and then the pipe P and flange F may be tack welded together.

[0044] However, with the piping P fixed to the slit-shaped insertion hole S of the base part 10, inserting the flange F into the correct position is time-consuming, and if the first bolt hole H1 of the flange F is misaligned with the second bolt hole H2 of the base part 10, it will take time to adjust, which may reduce work efficiency.

[0045] Furthermore, since the pipe P is already fixed, if the mounting position of the pipe P is misaligned, forcing the flange F in could damage the flange F or the pipe P, or cause slight distortion. Therefore, the recommended installation process is to first fix the flange F to the base part 10, and then insert the pipe P into the insertion hole S of the base part 10, as this allows for easy and stable and accurate alignment.

[0046] As described above, the pipe flange mounting jig and pipe flange mounting method according to the present invention can streamline the process of ensuring the flange is perpendicular to the pipe, while also ensuring stable quality. [Explanation of Symbols]

[0047] 1. Pipe flange mounting jig 10 Base section 20 Piping fixing part 21 Arms 22 nuts 23 plates 30 Flange fixing part 40 volts F flange H1 First bolt hole H2 Second bolt hole P piping S insertion hole

Claims

1. A jig for holding a flange for welding it to a pipe, A plate-shaped base portion having a width that matches the outer diameter of the pipe to be held, and having a slit-shaped insertion hole cut out from the edge toward the center, A pipe fixing part having a single fixing means integrated with the surface of the base part, wherein the pipe is held in the central part of the insertion hole, and the central axis of pipe holding is located on the axis of the pipe, The base portion is provided with a flange fixing portion on its back surface for stacking and fixing the flange, With the piping fixed by the fixing means, the flange is positioned perpendicular to the axis of the piping. Pipe flange mounting jig.

2. The fixing means of the pipe fixing portion is, It is one of the following: a clamp having a tightening mechanism, a magnet that attracts and fixes the pipe, or a groove formed to match the shape of the pipe. The pipe flange mounting jig according to claim 1.

3. The aforementioned pipe fixing part is, It is fixed to the base portion via a plate that is vertically attached to the base portion. A pipe flange mounting jig according to claim 1 or claim 2.

4. The flange fixing portion is With the flange superimposed on the back surface of the base portion, a second bolt hole is formed at a position that coincides with a first bolt hole formed in the circumferential direction of the flange, and the bolts that pass through the first bolt hole and the second bolt hole and fix the flange to the base portion are formed. A pipe flange mounting jig according to claim 1 or claim 2.

5. A plate-shaped base portion having a width that conforms to the outer diameter of the pipe to be held, and having a slit-shaped insertion hole cut out from the edge toward the center, A pipe fixing part having a single fixing means integrated with the surface of the base part, wherein the central axis of pipe holding is located on the axis of the pipe when the pipe is held in the insertion hole, A method of attaching a flange to a pipe using a pipe flange mounting jig that includes a flange fixing part for overlapping and fixing the flange on the back surface of the base part, The process of fixing the flange to the back surface of the base portion using the flange fixing portion, The steps include setting the base portion such that the edge portion opening to the side of the base portion points vertically upward, A step of introducing the piping into the insertion hole from the edge towards the center, A step of fixing the pipe with the pipe fixing part such that the axis of the pipe held in the insertion hole is perpendicular, The process includes welding the flange to the pipe while the flange is kept perpendicular to the axis of the pipe by the pipe flange mounting jig. How to install pipe flanges.

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