Flange joining device and flange joining method

Abstract

To provide a flange joining device and a flange joining method capable of giving stable pressing force over a wide range of a pair of flanges, without applying an excessive load due to pressing on an existing sealing member.SOLUTION: A flange joining device 10 reinforces joining of a flange 1a in one conduit structure member 1 and a flange 1a' in the other conduit structure member 1'. The flange joining device 10 is equipped with a fastener 31 that is inserted in through holes 1b and 1b' of the flanges 1a and 1a' to be fastened, and extending portions 13, 14, 23, and 24 that extend in a circumferential direction in which those abut on the flange surfaces 1d and 1d' due to fastening action of the fastener 31.SELECTED DRAWING: Figure 2

Description

Technical Field

[0006] , , , ,

[0001] The present invention relates to a flange joining device for attaching to flanges of fluid pipes and a method for joining flanges.

Background Art

[0002] It is known that pipeline components constituting pipelines through which water, gas, etc. flow are connected by arranging a sealing member between adjacent pipeline components and joining a pair of opposed flanges with bolts and nuts.

[0003] At the connection points between such pipeline components, deterioration of the pipeline components themselves, loosening of the joints by bolts and nuts, etc. may occur due to long-term use. Therefore, maintenance measures such as updating existing bolts and nuts with new ones are taken. In this maintenance measure, a flange joining device may be used to reinforce the joint of a pair of flanges.

[0004] For example, the flange joining device of Patent Document 1 is composed of a new bolt and nut inserted through and fastened to through holes in each of a pair of opposed flanges, and a reinforcing tool arranged between adjacent bolts and nuts to fasten the pair of flanges. The reinforcing tool can clamp the pair of flanges by further tightening the fasteners provided on the outer diameter side of each flange.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the flange joining device described in Patent Document 1, in addition to joining a pair of flanges with new bolts and nuts in the circumferential direction of the flanges, the pair of flanges can also be joined with reinforcing devices. That is, the joining of a pair of flanges can be reinforced by pressing the pair of flanges in the proximity direction over a wide area in the circumferential direction.

[0007] By the way, when joining flanges using new bolts, nuts, and reinforcing parts, it is necessary to equalize the tightening torque acting on each flange to a predetermined value. To do this, first replace the existing bolts and nuts with new ones and tighten the new bolts and nuts to the predetermined value. Then, place the reinforcing parts and tighten their torque to the predetermined value.

[0008] In this way, when fastening is added by the reinforcing device in addition to the new bolts and nuts that are pre-planned for fastening, the tightening torque of the reinforcing device acts on the area around the adjacent new bolts and nuts on the pair of flanges. As a result, the tightening torque of the bolts and nuts decreases, so it is necessary to tighten them again to the predetermined value. In other words, it is necessary to repeatedly and alternately tighten the new bolts and the reinforcing device until the tightening torques of the predetermined bolts and nuts and the reinforcing device are aligned to the predetermined value.

[0009] However, due to aging, sealing members may harden, crack, or otherwise deteriorate. Repeated tightening, as in the flange joint device described in Patent Document 1, could cause excessive pressure on the sealing member, potentially leading to rupture, powdering, or other damage, which could further increase the risk of fluid leakage.

[0010] This invention was made in view of these problems, and aims to provide a flange joining device and a flange joining method that can apply a stable pressing force to a pair of flanges over a wide area without applying excessive load by pressing to existing sealing members. [Means for solving the problem]

[0011] To solve the above problems, the flange joining apparatus of the present invention is A flange joining device for reinforcing the joint between a flange on one pipeline component and a flange on another pipeline component, A fastener that is inserted through the through hole of the flange and fastened, The fastener is characterized by comprising a circumferentially extending extension that contacts the flange surface by the fastening action of the fastener. This feature allows the extension portion to contact the flange surface simultaneously with the fastening action of the fastener, and the tightening torque from the fastener is distributed from the position of the fastener in the circumferential direction of the flange. As a result, a stable pressing force can be applied to a pair of flanges over a wide area without applying excessive load due to pressing to the existing sealing member.

[0012] The extension portion is characterized by extending evenly on both sides in the circumferential direction. This feature allows the tightening torque from the fastener to be evenly distributed on both sides in the circumferential direction, resulting in improved efficiency in pressing the extended portion against the flange surface with the fastener.

[0013] The extension portion is characterized by having a rotation prevention means that is locked to the flange. This feature makes it easy to install flange joint devices.

[0014] The extension portion is characterized by having ribs that extend in the circumferential direction. This feature allows the tightening force of the fastener to be applied to a position further away from the fastener itself.

[0015] The extension portion is characterized by having a projection that abuts against the flange surface. This feature ensures that the tightening torque of the fastener is reliably applied to a position further away from the fastener itself.

[0016] A method for joining a pair of flanges by a flange joining device that reinforces the joining between a flange on one pipe component and a flange on the other pipe component, comprising: removing an existing bolt and nut; inserting a fastener through a through-hole in the flange via an extension portion arranged in the circumferential direction of the flange; starting the fastening operation of the fastener and completing the fastening operation in a state where a position pressed by the fastener and a position spaced apart from the fastener in the extension portion are abutted against the flange surface. According to this feature, the extension portion abuts against the flange surface simultaneously with the fastening action of the fastener, and the tightening torque by the fastener is dispersed in the circumferential direction of the flange from the position of the fastener. Therefore, it is possible to apply a stable pressing force over a wide area to the pair of flanges without applying an excessive load due to pressing to an existing sealing member.

Brief Description of the Drawings

[0017] [Figure 1] It is a front view showing a state where flanges of pipe components in Example 1 are joined by an existing bolt and nut. [Figure 2] It is a front view showing a flange joining device for joining flanges of pipe components. [Figure 3] It is a plan view showing a flange joining device for joining flanges of pipe components [Figure 4] It is an exploded perspective view of one flange joining unit constituting the flange joining device. [Figure 5] It is a front view for explaining the attachment of the flange joining device. [Figure 6] It is a plan view schematically showing a state where a pair of flanges are pressed by the flange joining device. [Figure 7] It is a front view showing the flange joining device in Example 2. [Figure 8](a) is a front view showing an enlarged main part of the flange joining device in Example 2 during attachment, and (b) is a front view showing an enlarged main part of the flange joining device in Example 2 after attachment. [Figure 9] It is a plan view schematically showing a state where a pair of flanges are pressed by the flange joining device in Example 2. [Figure 10] It is a front view showing the flange joining device in Example 3. [Figure 11] (a) is a front view showing an enlarged main part of the flange joining device in Example 3 during attachment, and (b) is a front view showing an enlarged main part of the flange joining device in Example 3 after attachment. [Figure 12] It is a plan view schematically showing a state where a pair of flanges are pressed by the flange joining device in Example 3. [Figure 13] It is a plan view showing the flange joining device in Example 4. [Figure 14] It is a plan view showing the flange joining device in Example 5. [Figure 15] It is a front view showing the flange joining device in Example 5. [Figure 16] It is a plan view showing the flange joining device in Example 6. [Figure 17] It is a front view showing the flange joining device in Example 6.

Embodiments for Carrying Out the Invention

[0018] Embodiments for carrying out the flange joining device and the flange joining method according to the present invention will be described below based on examples.

Examples

[0019] The flange joint device according to Example 1 will be described with reference to Figures 1 to 6. Referring to Figure 1, the fluid pipeline buried underground is constructed by connecting a plurality of fluid pipes 1, 1', ... to each other. The fluid in the fluid pipes 1, 1' may be, for example, tap water, industrial water, sewage, gas, or a gas-liquid mixture of gas and liquid. Furthermore, one or both pipeline components are not limited to fluid pipes, but may also be structural members such as repair valves, or other valves, fittings, etc.

[0020] The fluid tubes 1,1' are ductile cast iron tubes and are formed in a substantially cylindrical shape in cross-section. The fluid tubes according to the present invention may also be made of other metals such as cast iron or steel, or concrete, polyvinyl chloride, polyethylene, or polyolefin. Furthermore, the inner circumferential surface of the fluid tube may be coated with an epoxy resin layer, mortar, plating, or an appropriate material may be applied to the inner circumferential surface of the fluid tube by powder coating.

[0021] The fluid pipes 1 and 1' each have circular flanges 1a and 1a' at their ends, projecting radially perpendicular to the pipe axis. Furthermore, the flanges 1a and 1a' have four equally spaced through-holes 1b or through-holes 1b' that penetrate approximately parallel to their axial direction. Flange 1a is a so-called RF (Raised Face) flange, with an annular projection slightly protruding along the pipe axis of the fluid pipe 1 at the end opposite flange 1a'. The same applies to flange 1a'.

[0022] The fluid pipes 1 and 1' are connected by inserting connecting bolts 2a through the through holes 1b and 1b' of the flanges 1a and 1a' with an elastic gasket P (sealing member) interposed between their respective annular protrusions, attaching nuts 2b to the connecting bolts 2a, and tightening the flanges 1a and 1a' with the connecting bolts 2a and nuts 2b.

[0023] In this type of fluid pipe connection configuration 1,1', loosening or deterioration of multiple connection bolts 2a and nuts 2b may occur due to restoring force generated by the elastic deformation of the gasket P, fluid pressure inside the fluid pipes 1,1', unforeseen external forces such as earthquakes, and rust formation due to aging. Therefore, after a predetermined period of time has elapsed, maintenance measures such as replacing the existing connection bolts 2a and nuts 2b with new connection bolts and nuts become necessary.

[0024] As shown in Figures 2 and 3, the flange joining device 10 of the present invention is installed to join flanges 1a and 1a' in place of new connecting bolts and nuts. The flange joining device 10 will be described below.

[0025] As shown in Figures 2 and 3, the flange jointing device 10 in this embodiment consists of flange jointing units 10A, 10B, 10C, and 10D, which are arranged in four equal parts circumferentially with respect to a pair of flanges 1a and 1a'. In Figure 3, the flange jointing units 10A to 10D are as follows: flange jointing unit 10C is at the 12 o'clock position, flange jointing unit 10B is at the 3 o'clock position, flange jointing unit 10A is at the 6 o'clock position, and flange jointing unit 10D is at the 9 o'clock position. Although different reference numerals are used for convenience of explanation, they all have the same configuration, so in the following explanation, unless otherwise specified, flange jointing unit 10A will be used as an example.

[0026] As shown in Figures 2 to 4, the flange joint unit 10A mainly consists of a first reinforcing member 11 positioned on the flange 1a side of the fluid pipe 1, a second reinforcing member 21 positioned on the flange 1a' side of the fluid pipe 1', and fastening bolts 31 and nuts 32 (fasteners) for joining the first reinforcing member 11 and the second reinforcing member 21.

[0027] The first reinforcing member 11 mainly consists of a cylindrical base 12 through which fastening bolts 31 are inserted, a first extension 13 extending clockwise from the base 12 in Figure 3, and a second extension 14 extending counterclockwise from the base 12 in Figure 3.

[0028] The first extension portion 13 is a flat plate that curves and extends along the outer circumferential surface 1c of the flange 1a. The opposing surface 13a facing the flange 1a is a straight, flat surface and is in the same plane as the opposing surface 12b of the base portion 12.

[0029] Furthermore, the first extension 13 has a rib 13b formed on the end face opposite to the opposing surface 13a, extending along its widthwise center. This ensures the structural strength of the first extension 13 while reducing its weight.

[0030] Furthermore, the first extension portion 13 has a plate-shaped locking piece 13c (anti-rotation means) formed on its outer side in the width direction, that is, on the outer diameter side of the flange 1a, which protrudes downward from the opposing surface 13a.

[0031] The second extension 14 is formed in a circumferentially symmetrical shape with respect to the first extension 13, and, like the first extension 13, has an opposing surface 14a formed on the same plane as the opposing surface 12b of the base 12, a rib 14b, and a locking piece 14c (anti-rotation means).

[0032] As shown in Figure 2, the second reinforcing member 21 is formed symmetrically with respect to the first reinforcing member 11 in the axial direction of flanges 1a, 1a', and, like the first reinforcing member 11, is mainly composed of a base portion 22, a first extension portion 23, and a second extension portion 24. The first extension portion 23 is positioned opposite the first extension portion 13 of the first reinforcing member 11, and the second extension portion 24 is positioned opposite the second extension portion 14 of the first reinforcing member 11.

[0033] A through hole 22a is formed in the base portion 22. The first extension portion 23, like the first extension portion 13 of the first reinforcing member 11, has an opposing surface 23a formed in the same plane as the opposing surface 22b of the base portion 22, a rib 23b, and a locking piece 23c. The second extension portion 24, like the second extension portion 14 of the first reinforcing member 11, has an opposing surface 24a formed in the same plane as the opposing surface 22b of the base portion 22, a rib 24b, and a locking piece 24c.

[0034] Next, a method for joining a pair of flanges 1a and 1a' using the flange joining device 10 will be described. For the purposes of this description, it will be assumed that the flanges 1a and 1a' are joined by existing connecting bolts 2a and nuts 2b installed through their respective through holes 1b and 1b', as shown in Figure 1.

[0035] First, referring to Figures 1 to 6, remove only the connecting bolt 2a and nut 2b located at the 6 o'clock position in Figure 3, out of the four connecting bolts 2a and nuts 2b that are evenly spaced in the circumferential direction.

[0036] Next, as shown in Figure 5, the male threaded portion 31a of the fastening bolt 31, which is inserted through the through hole 12a of the base 12 of the first reinforcing member 11, is inserted through the through holes 1b and 1b' (see Figure 1) from which the connecting bolt 2a and nut 2b were removed. Subsequently, the second reinforcing member 21 is fitted onto the male threaded portion 31a of the fastening bolt 31 from the fluid pipe 1' side through the through hole 22a of the base 22 of the second reinforcing member 21.

[0037] Next, the female threaded portion 32a of the nut 32 (see Figure 4) is screwed onto the male threaded portion 31a of the fastening bolt 31, and the fastening process begins. During the fastening process, with the fastening bolt 31 held in place, the nut 32 is rotated using a fastening jig such as a torque wrench (not shown) until the tightening torque reaches a predetermined value, thereby tightening the flanges 1a and 1a'. Alternatively, during the fastening process, the fastening bolt 31 may be rotated while the nut 32 is held in place.

[0038] During this time, even if the reinforcing members 11 and 21 attempt to rotate together with the fastening bolts 31 and nuts 32, the locking pieces 13c, 23c or 14c, 24c contact the outer circumferential surfaces 1c, 1c' of the flanges 1a and 1a', preventing the reinforcing members 11 and 21 from rotating together with the flanges 1a and 1a', thus facilitating the fastening of the bolts 31 and nuts 32. Furthermore, when removing the flange joint device 10, the locking pieces 13c, 23c or 14c, 24c contact the outer circumferential surfaces 1c, 1c' of the flanges 1a and 1a', making the removal process easy.

[0039] Furthermore, the locking pieces 13c, 23c, 14c, and 24c may be made of a cushioning material such as an elastic rubber plate or resin material at the contact points with the outer peripheral surfaces 1c, 1c' of the flanges 1a, 1a'. With such a configuration, even if the locking pieces 13c, 23c, 14c, and 24c come into contact with the flanges 1a, 1a', it is possible to prevent damage to the flanges 1a, 1a'.

[0040] The tightening of the flange joint unit 10A is completed when the tightening torque of the fastening bolts 31 and nuts 32 reaches a predetermined value. As a result, the base 12 of the first reinforcing member 11 and the base 22 of the second reinforcing member 21 are pressed against the flange surface 1d of flange 1a or the flange surface 1d' of flange 1a', as shown by the dot pattern in Figure 6. In addition, the extensions 13 and 14 of the first reinforcing member 11 and the extensions 23 and 24 of the second reinforcing member 21 are also pressed against the flange surface 1d of flange 1a or the flange surface 1d' of flange 1a'.

[0041] In other words, the tightening torque of the fastening bolts 31 and nuts 32 is distributed to the bases 12 and 22 and extensions 13, 14, 23, and 24 of the reinforcing members 11 and 21. As a result, compared to simply joining with connecting bolts 2a and nuts 2b, a single flange joining device 10 can apply pressing force to a wide circumferential area of ​​the flanges 1a and 1a' in a direction that brings the flanges 1a and 1a' closer together, and the tightening torque is less likely to concentrate locally on the gasket P.

[0042] Next, remove only the connecting bolts 2a and nut 2b located on the radially opposite side of flanges 1a and 1a' from flange joint unit 10A, i.e., at the 12 o'clock position in Figure 3. Then, install flange joint unit 10C in the same way as flange joint unit 10A.

[0043] Next, of the remaining two sets, remove only the connecting bolt 2a and nut 2b located at the 3 o'clock position in Figure 3, and install flange joint unit 10B in the same way as flange joint units 10A and 10C.

[0044] Finally, remove only the connecting bolt 2a and nut 2b located at the 9 o'clock position in Figure 3, and install flange joint unit 10D in the same way as flange joint units 10A, 10B, and 10C.

[0045] In other words, the next flange joint unit is attached to the through holes 1b and 1b' located diagonally opposite to the previously attached flange joint unit. Compared to a configuration in which the flange joint units are attached in a clockwise order, for example, relative tilting between the pair of flanges 1a and 1a' and uneven tightening torque are less likely to occur, making it easier to set the tightening torque of each flange joint unit to a predetermined value in a nearly uniform manner. Alternatively, the flange joint unit 10D may be attached first after the flange joint units 10A and 10C have been attached.

[0046] Then, after installing all flange joint units 10A, 10B, 10C, and 10D, the tightening torque is checked again with a torque wrench. At this time, for flange joint units 10A to 10D, as described above, it is only necessary to adjust the tightening torque of the fastening bolts 31 and nuts 32 to a predetermined value, similar to the existing connecting bolts 2a and nuts 2b. Therefore, compared to a configuration such as the flange joint device in Patent Document 1, which uses new bolts and nuts and reinforcing devices and tightens them alternately, it is possible to prevent excessive load from being applied to the existing gasket P due to pressing.

[0047] As described above, in this embodiment, the flange joining device 10 has extensions 13 and 14 that contact the flange surfaces 1d and 1d' simultaneously with the fastening action of the fastening bolts 31 and nuts 32. As a result, the tightening torque from the fastening bolts 31 and nuts 32 is distributed from the position of the fastening bolts 31 and nuts 32 in the circumferential direction of the flanges 1a and 1a'. Therefore, a stable pressing force can be applied to the pair of flanges 1a and 1a' over a wide area without applying excessive load due to pressing to the existing gasket P.

[0048] Furthermore, since the extensions 13 and 14 have a symmetrical shape with respect to the base 12 and extend substantially evenly in the circumferential direction, the tightening torque from the fastening bolts 31 and nuts 32 is more easily distributed evenly on both sides in the circumferential direction compared to, for example, a configuration having only the extension 13 or a configuration in which the circumferential lengths of the extensions 13 and 14 are different. As a result, the efficiency of pressing the extensions 13 and 14 against the flanges 1a and 1a' with the fastening bolts 31 and nuts 32 is improved.

[0049] Furthermore, since the extensions 13 and 14 have ribs 13b and 14b, the tightening force of the fastening bolts 31 and nuts 32 can be applied to a position further apart from the fastening bolts 31 and nuts 32.

[0050] Furthermore, since the reinforcing members 11 and 21 have the same shape, when attaching the flange joint unit 10A, the reinforcing member 21 may be placed on the flange 1a side, and the orientation of attachment and the corresponding members are not limited, making the attachment work easy.

[0051] Furthermore, the base portion 12 may be provided with a rotation-preventing member to prevent the fastening bolt 31 or nut 32 from rotating. With such a configuration, the fastening work of the fastening bolt 31 and nut 32 can be easily performed.

[0052] Furthermore, when removing the existing connecting bolts 2a and nuts 2b, a clamp or the like may be attached near the connecting bolts 2a and nuts 2b as needed to compensate for the pressure lost when the connecting bolts 2a and nuts 2b are removed. The length of each extension may be adjusted so that a gap is formed between adjacent flange connecting units, anticipating the attachment of such a clamp or the like, or notches may be formed in the reinforcing members 11 and 21 to avoid interference with the clamp or the like. [Examples]

[0053] Next, the flange joining device according to Embodiment 2 will be described with reference to Figures 7 to 9. Note that components identical to those shown in the previous embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

[0054] As shown in Figures 7 to 9, the flange joining device 110 is composed of flange joining units 110A to 110D. These flange joining units 110A to 110D all have the same configuration.

[0055] Before installation, the extensions 113 and 114 of the first reinforcing member 111 are formed in an elastic, leaf-spring shape, with their circumferential ends curved to be close to the flange 1a. In Figure 7, the locking pieces 13c, 14c, 23c, and 24c are shown as dashed lines to clarify the shape of the extensions 113 and 114.

[0056] Furthermore, as shown in Figure 8(a), the base portion 112 protrudes toward the flange surface 1d more than the connection portion between the base portion 112 and the extension portions 113 and 114, and is spaced further away from the flange surface 1d than the circumferential ends of the extension portions 113 and 114.

[0057] The second reinforcing member 121 has a shape symmetrical to the first reinforcing member 111 in the axial direction of flanges 1a and 1a', and has a base portion 122 and leaf spring-shaped extensions 123 and 124 that protrude toward the flange surface 1d side.

[0058] As a result, when installing the flange joint unit 110A, by starting the fastening work of the fastening bolts 31 and nuts 32, the circumferential ends of the opposing surfaces 113a, 114a, 123a, and 124a of the extensions 113 and 114 of the first reinforcing member 111 and the extensions 123 and 124 of the second reinforcing member 121, respectively, come into contact with the corresponding flange 1a or flange 1a'.

[0059] As shown in Figure 8(b), as the fastening process continues, the extensions 113, 114, 123, and 124 elastically deform so that the bases 112 and 122 of the reinforcing members 111 and 121 move closer together, and the opposing surfaces 112b and 122b of the bases 112 and 122 of the reinforcing members 111 and 121 come into contact with the flange surface 1d of the corresponding flange 1a or the flange surface 1d' of flange 1a'.

[0060] Through this contact, the circumferential ends of the base portions 112, 122 and the extension portions 113, 114, 123, 124 are pressed against the flange surfaces 1d, 1d', as shown by the dot pattern in Figure 9.

[0061] At this time, the tightening torque of the fastening bolts 31 and nuts 32 is distributed to the circumferential ends of the base portions 112, 122 and the extension portions 113, 114, 123, 124, respectively. Furthermore, a restoring force is applied to the flanges 1a, 1a' as the extension portions 113, 114, 123, 124 attempt to return to their elastic state. As a result, the force pressing on the flanges 1a, 1a' at various points is increased compared to the previous embodiment. Therefore, the dot pattern in Figure 9 is shown with a higher density than the dot pattern in Figure 6.

[0062] Furthermore, since the extensions 113, 114, 123, and 124 are curved and have bases 112 and 122 that protrude toward the flanges 1a and 1a', compared to the flat shape of Embodiment 1, even if the flange surfaces 1d and 1d' are uneven due to rust spots, paint peeling, etc., it is easier to concentrate pressure on the circumferential ends of the bases 112 and 122 and the extensions 113, 114, 123, and 124. In other words, regardless of the condition of the flange surfaces 1d and 1d', the tightening force of the fastening bolts 31 and nuts 32 can be applied to a position further away from the fastening bolts 31 and nuts 32.

[0063] Furthermore, the restoring force generated during elastic deformation is enhanced in the extensions 113, 114, 123, and 124 by the ribs 113b, 114b, 123b, and 124b. In this embodiment, the extensions 113, 114, 123, and 124 have been described as having ribs 113b, 114b, 123b, and 124b, but they may also be configured without ribs 113b, 114b, 123b, and 124b in order to facilitate elastic deformation. [Examples]

[0064] Next, the flange joining device according to Embodiment 3 will be described with reference to Figures 10 to 12. Note that components identical to those shown in the previous embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

[0065] As shown in Figures 10 to 12, the flange joining device 210 is composed of flange joining units 210A to 210D. These flange joining units 210A to 210D all have the same configuration.

[0066] The extensions 213 and 214 of the first reinforcing member 211 before installation are formed in a leaf spring shape, similar to Embodiment 2, and hemispherical projections 213d and 214d are formed at the circumferential ends of their opposing surfaces 213a and 214a, respectively, projecting toward the flange 1a.

[0067] Furthermore, as shown in Figure 11(a), the opposing surface 212b of the base 212 is continuous with the opposing surfaces 213a and 214a, forming a single plane. In addition, four projections 212c are equally spaced in the circumferential direction on the opposing surface 212b, projecting toward the flange 1a, and each projection 212c is spaced further away from the flange surface 1d than projections 213d and 214d.

[0068] The second reinforcing member 221 has a shape symmetrical to the first reinforcing member 211 in the axial direction of flanges 1a, 1a', and has a base portion 222 on which four protrusions 222c are formed, and leaf spring-shaped extensions 223, 224 on which protrusions 223d or 224d are formed.

[0069] As a result, when installing the flange joint unit 210A, the protrusions 213d, 214d, 223d, and 224d of the reinforcing members 211 and 221 come into contact with the corresponding flange 1a or flange 1a' before the fastening of the fastening bolts 31 and nuts 32 is started.

[0070] As shown in Figure 11(b), as the fastening process continues, the extensions 213, 214, 223, and 224 elastically deform so that the bases 212 and 222 of the reinforcing members 211 and 221 move closer together, and the projections 212c and 222c of the bases 212 and 222 come into contact with the flange surface 1d of the corresponding flange 1a or the flange surface 1d' of flange 1a'.

[0071] As shown by the dot pattern in Figure 12, the protrusions 212c, 213d, 214d, 222c, 223d, and 224d are pressed against the flange surfaces 1d and 1d'.

[0072] In this case, the tightening torque of the fastening bolts 31 and nuts 32 is distributed to each of the protrusions 212c, 213d, 214d, 222c, 223d, and 224d. Also, the area in which the protrusions 212c, 213d, 214d, 222c, 223d, and 224d are in contact with the flange surfaces 1d and 1d' is narrower than in Embodiment 2. Furthermore, a restoring force is applied to the extensions 213, 214, 223, and 224 as they attempt to return to their elastic state. As a result, the force pressing against the flanges 1a and 1a' is increased at each point compared to Embodiment 2. Therefore, the dot pattern in Figure 12 is shown with a higher density than the dot patterns in Figures 6 and 9.

[0073] Furthermore, since the extensions 213, 214, 223, and 224 are curved in shape and also have protrusions 212c, 213d, 214d, 222c, 223d, and 224d, compared to the above embodiment, even if the flange surfaces 1d and 1d' are uneven due to rust spots, peeling paint, etc., it is easier to press the circumferential ends of the bases 212 and 222 and the extensions 213, 214, 223, and 224 into contact. In other words, regardless of the condition of the flange surfaces 1d and 1d', the tightening force of the fastening bolts 31 and nuts 32 can be applied to a position further away from the fastening bolts 31 and nuts 32.

[0074] Furthermore, since the projection 213d is formed at the circumferential end and widthwise center of the extension 213, i.e., on the opposite side of the rib 113b, it can reliably contact the flange surface 1d compared to a configuration where multiple projections are close together. Also, because it is supported by the rib 113b, the restoring force acting on the flange surface 1d is less likely to escape. The same applies to the other projections 214d, 223d, and 224d.

[0075] Multiple protrusions may be formed, and with such a configuration, at least one of the protrusions will contact the flange surface 1d, thereby more reliably transmitting the tightening torque of the fastening bolt 31 and nut 32. The positions of the protrusions may also be changed as appropriate.

[0076] Furthermore, although the protrusions were described as having a hemispherical shape, they are not limited to this configuration and may have a shape that allows for line contact or surface contact, and their shape may be modified as appropriate.

[0077] Furthermore, as in the first embodiment described above, the extension may have protrusions formed on it, and the extension does not have to be in the shape of a leaf spring. [Examples]

[0078] Next, the flange joining device according to Embodiment 4 will be described with reference to Figure 13. Note that components identical to those shown in the previous embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

[0079] As shown in Figure 13, the flange joining device 310 is composed of flange joining units 310A to 310D. These flange joining units 310A to 310D all have the same configuration.

[0080] The extension portion 313 of the first reinforcing member 311 is formed in an inverted L-shape with the outer diameter side at the circumferential end cut out. Similarly, the extension portion 314 of the first reinforcing member 311 is formed in an L-shape with the outer diameter side at the circumferential end cut out. Although not shown directly, the second reinforcing member is formed symmetrically with respect to the first reinforcing member 311 in the axial direction of flanges 1a and 1a'.

[0081] As a result, the circumferential end of the extension portion 313 of flange joint unit 310A and the circumferential end of the extension portion 314 of flange joint unit 310D overlap radially with flanges 1a and 1a'. Also, the circumferential end of the extension portion 314 of flange joint unit 310A and the circumferential end of the extension portion 313 of flange joint unit 310B overlap radially with flanges 1a and 1a'. In this way, the flange joint device 310 can apply tightening torque to the fastening bolts 31 and nuts 32 over the circumferential direction of flanges 1a and 1a'. [Examples]

[0082] Next, the flange joining device according to Embodiment 5 will be described with reference to Figures 14 and 15. Note that components identical to those shown in the previous embodiments are denoted by the same reference numerals, and redundant descriptions are omitted.

[0083] As shown in Figures 14 and 15, the flange joining device 410 is composed of flange joining units 410A to 410D. These flange joining units 410A to 410D all have the same configuration.

[0084] The first reinforcing member 411 comprises a base portion 412 extending in the outer diameter direction of the flange 1a, extension portions 13 and 14, and a connecting portion 415 positioned on the outer diameter side of the outer peripheral surface 1c of the flange 1a.

[0085] The connecting portion 415 is composed of a pair of connecting pieces 416 and 417 that extend substantially perpendicularly to the edge of the base portion 412, which is located on the outer diameter side of the flange 1a.

[0086] In a side view, the connecting piece 416 is formed as a flat plate extending from the base 412 in the direction of the pipe axis of the fluid pipes 1,1'. The connecting piece 416 also has an elongated hole 416a that extends from the longitudinal center to the circumferential end and penetrates in the thickness direction.

[0087] The connecting piece 417 is formed in the same shape as the connecting piece 416 and has an elongated hole 417a. These elongated holes 416a and 417a are positioned so that the male threaded portion 41a of the fixing bolt 41 can be inserted through them.

[0088] The second reinforcing member 421 comprises a base portion 422 extending along the radial direction of the flange 1a', extension portions 23 and 24, and a connecting portion 425 positioned on the outer diameter side of the outer peripheral surface 1c' of the flange 1a'.

[0089] The base portion 422 is formed in a flat plate shape when viewed from above. Furthermore, the base portion 422 has a female threaded portion 422a that penetrates in the thickness direction at the radial ends of the flanges 1a and 1a'. The male threaded portion 31a of the fastening bolt 31 can be screwed into the female threaded portion 422a. In other words, the fastening bolt 31 and the second reinforcing member 421 are the fasteners in this embodiment.

[0090] The connecting portion 425 is formed in a flat plate shape when viewed from the side. In addition, in a plan view, the connecting portion 425 extends from the center in the width direction of the base portion 422 along the radial direction of the flange 1a'. Furthermore, the connecting portion 425 is formed to be insertable between the connecting pieces 416 and 417 of the first reinforcing member 411. Moreover, the connecting portion 425 has a through hole 425a that penetrates through the base portion 422 in the width direction.

[0091] For the installation of the flange joint unit 410A, first, the male threaded portion 31a of the fastening bolt 31 is inserted through the through hole 412a of the first reinforcing member 411 and the through holes 1b and 1b' of the flanges 1a and 1a', and then screwed into the female threaded portion 422a of the second reinforcing member 421. The connecting portion 425 of the second reinforcing member 421 is sandwiched between the connecting pieces 416 and 417 of the first reinforcing member 411, so that it does not rotate together with the fastening bolt 31. This makes the fastening work with the fastening bolt 31 and the second reinforcing member 421 easy.

[0092] In addition, as in the above embodiment, the fastening bolt 31 may have its male threaded portion 31a screwed onto the nut 32. In such a configuration, it is preferable that the base portion 422 of the second reinforcing member 421 has a through hole 22a instead of a female thread 422a.

[0093] As the fastening bolt 31 and the second reinforcing member 421 are fastened, the second reinforcing member 421 moves toward the flange 1a' and comes into contact with the flange surface 1d'.

[0094] Subsequently, the fixing bolts 41 and nuts 42 are tightened further, bringing the connecting pieces 416 and 417 closer together and clamping the connecting portion 425 of the second reinforcing member 421. As a result, the connecting portions 415 and 425 are fixed together at the position where the tightening torque of the fastening bolts 31 and the second reinforcing member 421 reaches a predetermined value, thus maintaining the appropriate distance between the flanges 1a and 1a'. Therefore, it is possible to prevent excessive load from being applied to the existing gasket P due to pressing.

[0095] Furthermore, even if external forces such as the restoring force of the gasket P, the fluid pressure in the fluid pipes 1,1', and earthquakes act on the fastening bolts 31 and the second reinforcing member 421 in the direction of separation, the fastening of the fastening bolts 31 and the second reinforcing member 421 not only maintains the joint, but the first reinforcing member 411 and the second reinforcing member 421 maintain the proper fastening position of these fastening bolts 31 and the second reinforcing member 421 against external forces. Therefore, compared to the case where the flanges 1a and 1a' are simply joined with existing connecting bolts 2a and nuts 2b, the joint of flanges 1a and 1a' is further reinforced.

[0096] Furthermore, since the second reinforcing member 421 is prevented from rotating by the first reinforcing member 411, the fastening bolt 31 and the second reinforcing member 421 are less likely to loosen compared to when they are fastened with the connecting bolt 2a and nut 2b. [Examples]

[0097] Next, the flange joining device according to Embodiment 6 will be described with reference to Figures 16 and 17. Note that components identical to those shown in the previous embodiments are denoted by the same reference numerals, and redundant descriptions are omitted.

[0098] As shown in Figures 16 and 17, the flange joining device 510 is composed of flange joining units 510A to 510D. These flange joining units 510A to 510D all have the same configuration.

[0099] The first reinforcing member 511 is composed of a connecting member 518 having a base portion 512 and a connecting portion 515, and a plate-shaped extension member 519 having a base portion 512A and extension portions 13, 14. The second reinforcing member 521 is composed of a connecting member 528 having a base portion 522 and a connecting portion 525, and a plate-shaped extension member 529 having a base portion 522A and extension portions 23, 24.

[0100] For the installation of the flange joint unit 510A, an extension member 519 is placed between the base 512 of the connecting member 518 of the first reinforcing member 511 and the flange 1a, and the male threaded portion 531a of the fastening bolt 531 is inserted through the respective through holes 512a, 512Aa, 1b, and 1b'.

[0101] Next, the extension member 529 of the second reinforcing member 521 is fitted onto the male threaded portion 531a of the fastening bolt 531 through the through hole 522Aa of the extension member 529 of the second reinforcing member 521. Then, the male threaded portion 531a is screwed into the female threaded portion 522a of the connecting member 528 of the second reinforcing member 521, and the fastening process begins.

[0102] Subsequently, the connecting member 528 of the fastening bolt 531 and the second reinforcing member 521 is fastened, causing the extension members 519 and 529 to be pressed against the flange surfaces 1d and 1d'. Thus, the first reinforcing member and the second reinforcing member may be composed of multiple members.

[0103] Although embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and any changes or additions that do not depart from the spirit of the present invention are also included.

[0104] For example, in the above embodiment, the flange joint device was described as being used when replacing existing connecting bolts and nuts, but it is not limited to this, and the flange joint device may also be used when connecting new pipeline components, and is not limited to being used only for replacing existing connecting bolts and nuts.

[0105] Furthermore, although the flange joining device was described as having four flange joining units equally arranged to match the through holes of a pair of flanges, it is not limited to this configuration, and the number may be changed as appropriate to match the through holes of a pair of flanges. Also, the units do not have to be equally arranged.

[0106] Furthermore, although the above embodiment described each flange as being circular, it is not limited to this configuration and may be polygonal in shape, and is not limited to circular. For example, if it is polygonal, the extension may extend linearly along its outer surface, and may also have a corner formed along the outer surface in the middle of the extension. In other words, as long as it is formed along the outer surface of the flange, its shape may be changed as appropriate.

[0107] Furthermore, although the above embodiment described the extension as extending from the base on both sides in the circumferential direction, it is not limited to this configuration, and may extend only on one side in the circumferential direction.

[0108] Furthermore, although the above embodiment described a configuration in which a pair of extensions extending on both sides in the circumferential direction of a single reinforcing device are integrally formed, the configuration is not limited to this, and the extension extending on one side in the circumferential direction and the extension extending on the other side in the circumferential direction may be separate components.

[0109] Furthermore, although the above embodiment described the connecting portion of the first reinforcing member as extending along the axial direction of the flange, the invention is not limited to this configuration. The connecting portion of the second reinforcing member may also extend along the axial direction of the flange, and the connecting portions of the first and second reinforcing members may extend at an inclination so as to be able to intersect. As long as they can intersect, their shapes may be appropriately modified.

[0110] Furthermore, although the above embodiment described a configuration in which the first and second reinforcing members are tightened by fixing bolts and nuts, which are fixing means, the configuration is not limited to this. After being fixed by hand with fixing bolts and nuts, they may also be further fixed by welding, or they may be fixed by welding alone. In other words, the fixing method by the fixing means may be changed as appropriate.

[0111] Furthermore, although the above embodiment described a configuration in which the connecting portion of the first reinforcing member sandwiches the connecting portion of the second reinforcing member, the configuration is not limited to this, and it is not necessary for them to be sandwiched. Even with such a configuration, the second reinforcing member can be prevented from rotating relative to the first reinforcing member by connecting the first and second reinforcing members so that they can move relative to each other, for example, with fixing bolts and nuts. Moreover, since it is not necessary to elastically deform the connecting portion of the first reinforcing member, and it can be a rigid body that is resistant to elastic deformation, the structural strength can be increased. [Explanation of symbols]

[0112] 1,1' Fluid pipe (pipeline component) 1a, 1a' flange 1b,1b' Through hole 1c,1c' Outer surface 1d, 1d' flange surface 2a Connecting bolts (existing bolts) 2b Nut (existing nut) 10 Flange joining device 13,23 1st extension part 13b, 23b Ribs 13c, 23c Locking piece (anti-rotation means) 14,24 2nd extension part 14b, 24b Ribs 14c, 24c Locking piece (anti-rotation means) 31 Fastening bolts (fasteners) 32. Nuts (fasteners) 110 Flange joining device 113,123 1st extension part 113b, 123b Ribs 114,124 2nd extension part 114b, 124b Ribs 210 Flange joining device 213,223 1st extension part 213d,223d protrusion 214,224 2nd extension part 214d,224d protrusion 310 Flange Joining Device 313 1st extension part 314 Second extension part 410 Flange Joining Device 421 Second reinforcing device (fastener) 510 Flange joining device 528 Connecting members (fasteners) 531 Fastening bolts (fasteners) P Gasket (sealing component)

Claims

1. A flange joining device for reinforcing the joint between a flange on one pipeline component and a flange on another pipeline component, Multiple fasteners are inserted into and fastened through multiple through holes in the flange, A flange joining device comprising: a plurality of reinforcing members arranged along the circumferential direction of the flange, each having a base portion that abuts against the flange surface of the flange by the fastening action of the respective fastener, and a first extension portion and a second extension portion that extend from the base portion in a terminal manner on both sides in the circumferential direction, with the first extension portion of one reinforcing member having a curved portion or projection that abuts against the flange surface at the end near the second extension portion of another reinforcing member adjacent to one side in the circumferential direction of the first reinforcing member, and the second extension portion of the first reinforcing member having a curved portion or projection that abuts against the flange surface at the end near the first extension portion of yet another reinforcing member adjacent to the other side in the circumferential direction of the first reinforcing member.

2. The flange joining device according to claim 1, characterized in that the first extension and the second extension extend equally on both sides in the circumferential direction.

3. The flange joining device according to claim 1 or 2, characterized in that the first extension and the second extension have anti-rotation means that are locked to the flange.

4. The flange joining device according to any one of claims 1 to 3, characterized in that the first extension and the second extension have ribs extending in the circumferential direction.

5. A method for joining a pair of flanges using a flange joining device that reinforces the joint between a flange on one pipeline component and a flange on another pipeline component, The process of removing existing bolts and nuts, The process involves inserting a plurality of fasteners through a plurality of through holes in the flange, each fastener having a base portion and first and second extension portions that extend from the base portion in a terminal manner on both sides in the circumferential direction to a length longer than the radial direction of the flange, via a plurality of reinforcing members arranged along the circumferential direction of the flange. A method for joining a pair of flanges using a flange joining device, characterized by the step of starting the fastening work of each of the fasteners, and completing the fastening work while the position at the base of one reinforcing member that is pressed by the fastener, the position at the end of another reinforcing member adjacent to one circumferential direction of the first reinforcing member, spaced apart from the fastener, where a curved portion or projection of the first extension of the first reinforcing member is formed, and the position at the end of yet another reinforcing member adjacent to the other circumferential direction of the first reinforcing member, where a curved portion or projection of the second extension of the first reinforcing member is formed, are in contact with the flange surface of the flange.

Images