JP2014181763A - Fastening method for fastening fluid devices to each other and fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening method for fastening fluid devices to each other for seal closing bolt holes as well as reducing a default in which a nut interferes with surrounding devices while restricting its cost.SOLUTION: A double-end stud 2 having a non-grooved side surface 2c at its central part is applied as a bolt and the double-end stud 2 is passed through a bolt hole 15 in such a way that the non-grooved side surface 2c may be exposed from at least one flange surface 16 of a flange part 12f toward an axial outside part. Then, ring-like resilient seal members 4 are placed between it and a flange surface 16 to fasten the nut 3 against both ends of the double-end stud 2. During this work, if the non-groove side surface 2c is exposed out of the flange surface 16, a through-hole nut 30 is applied and fastened under a state in which an inner peripheral surface 4a of the resilient seal member 4 is being contacted with the non-grooved side surface 2c and in turn in the case that the non-grooved side surface 2c is not exposed out of the flange surface 16, a cap nut 31 is applied and fastened under a state in which the resilient seal member 4 is being contacted with the flange surface 16 and the cap nut 31.

Description

  The present invention relates to a fastening method and a fastener for fluid devices that flange-join fluid devices (a gate valve, a repair valve, etc.) constituting a fluid piping system.

  Fasteners such as bolts and nuts are used for flange joining between fluid pipes such as water pipes or flange joining between a fluid pipe and a fluid device. For example, in Patent Document 1, a headed hexagon bolt is inserted into a bolt hole formed in a flange portion, a through nut is attached to the tip of the headed hexagon bolt, a head bolt and a through nut are tightened, Is disclosed.

  In such a flange joint portion, fluid (water) may leak from between the flange portions due to an external force such as an earthquake or aging. In order to prevent this fluid leakage in advance, or as one effective means for stopping the leakage of the fluid that has actually occurred, for example, use of the instrument of Patent Document 2 can be cited. In Patent Document 2, a pipe for fixing a packing wound around a position where the gap between the radial ends of the flange portion is closed to the flange portion in order to seal the gap between the radial ends of the flange portion. A reinforcing bracket is disclosed. Since this pipe reinforcing bracket prevents fluid leakage from between the flange portions, in order to prevent leakage from the bolt hole, between the bolt head and the flange surface, and between the nut and flange surface. It is necessary to interpose a ring-shaped elastic seal member between them.

JP 2011-122692 A Design Registration No. 1305825

  By the way, the fluid devices (gate valve 11 and repair valve 12) having the same function, such as newly connecting the repair valve 12 as shown in FIG. 1C, are connected to the existing gate valve 11 shown in FIG. 1A. Therefore, it is possible to improve the earthquake resistance by duplicating the function. However, as shown in FIG. 6, the fluid devices 11 and 12 often have a box portion larger than the tube diameter of the flange portions 11 f and 12 f, and the head is conventionally used when connecting the fluid devices 11 and 12. If the head bolt 102 is used, the head 102a of the head bolt 102 and the fluid devices 11 and 12 interfere with each other, and the head bolt 102 cannot be inserted into the bolt holes 15 of the flange portions 11f and 12f.

  Therefore, even in an environment where the headed bolt cannot be inserted into the bolt hole, in order to fasten the flange portion while sealing the bolt hole, both screw bolts without a head are used instead of the headed bolt. It is conceivable to attach a cap nut to the part via a ring-shaped elastic seal member. However, the cap nut is more expensive and has a larger axial dimension than the penetrating nut, so if two cap nuts are attached to both ends of both screw bolts, the cost increases and, in some cases, interferes with other peripheral devices. May not be installed.

  On the other hand, even if it is going to use a penetration nut, when an elastic seal member overlaps with a screw groove of both screw bolts, a water leak may not be prevented by a crevice between a screw groove of a bolt, and an elastic seal member.

  The present invention has been made paying attention to such a problem, and is a method for fastening fluid devices together that not only seals a bolt hole but also reduces a problem that a nut interferes with peripheral devices while suppressing cost. And providing fasteners.

  In order to achieve this object, the present invention takes the following measures.

  That is, according to the method of fastening fluid devices of the present invention, a bolt is inserted into a bolt hole formed in a flange portion of the fluid device, a nut is attached to a tip portion of the bolt, and the bolt and the nut are tightened. A method of fastening fluidic devices together, wherein both screw bolts having a groove-less side surface at the center portion are used as the bolt, and the groove-less side surface is exposed from the flange surface of at least one flange portion to the outside in the axial direction. In inserting the screw bolts through the bolt holes, and interposing a ring-shaped elastic seal member between the flange surfaces and fastening the nuts to both ends of the screw bolts, the groove-less side surfaces are the flange surfaces. If the inner surface of the elastic seal member is in contact with the non-grooved side surface, a through nut is used. If the non-grooved side is not exposed from the flange surface, using cap nut comprises a clamping step of fastened in a state where said elastic seal member is brought into contact with the flange surface and said cap nut.

  Examples of the fluid device include a device for controlling a fluid such as a valve device. The fluid device is connected to another device or a fluid pipe via the flange portion. The fluid device has a box portion having a diameter larger than the tube diameter of the flange portion. Both screw bolts mean bolts that do not have a head, screw grooves are formed on both side surfaces, and screw grooves are not formed on the center side surfaces. A through nut means a nut through which a screw hole passes. A cap nut means a nut in which one side of a screw hole is closed.

According to this method, when both screw bolts are arranged so that the grooveless side surface is exposed to the outside in the axial direction from the flange surface of at least one flange portion, and the grooveless side surface is exposed from the flange surface, the through nut Therefore, a through nut is always used for at least one of two nuts attached to both ends of both screw bolts. The through nut generally has a smaller axial dimension and a lower cost than the cap nut. Therefore, it is possible to reduce the axial dimension of the space occupied by the nut compared to the case where the cap nut is used for both, to reduce problems that interfere with other devices, and to reduce the cost.
Nevertheless, if a through nut is used, if the grooved side surface of the bolt contacts the inner peripheral surface of the elastic seal member, water leakage may occur from that portion. Since the peripheral surface is in contact with each other, water leakage between the screw bolts and the seal member can be prevented.
Furthermore, since the cap nut is used when the non-grooved side surface is not exposed from the flange surface, even if water leaks between the elastic seal member and both screw bolts, the cap nut can appropriately stop water.
Furthermore, depending on whether or not the grooved side surface is exposed from the flange surface, a through nut and a cap nut are used properly, so it is possible to handle various thicknesses of the flange with a kind of both screw bolts. It is not necessary to use both screw bolts, and the cost is low.
Therefore, it is possible to accurately seal the bolt hole and reduce the trouble that the nut interferes with the peripheral device while suppressing the cost.

  Even when the fluid device and both screw bolts interfere with each other, in order to accurately insert both screw bolts into the bolt holes, in the insertion step, the abutting surface of the flange portion with the fluid devices being separated from each other It is preferable to insert the screw bolts into the bolt holes from the side.

  In order to reduce the manufacturing cost by sharing parts, in the fastening process, when the through nut is used because the groove-less side surface is exposed from the flange surface, the elastic seal member and the through nut It is preferable to interpose a spacer between them.

  In order to reduce the space occupied by the nut, in the fastening step, when the groove-less side surface is not exposed from the flange surface, a through nut is used instead of using the cap nut, and the both Using a grooved elastic seal member having a groove corresponding to the screw groove of the screw bolt on the inner peripheral surface, and tightening the through nut in a state where the screw groove of both the screw bolts and the groove of the grooved elastic seal member are engaged with each other It is preferable to do.

  Furthermore, in order to improve the water stop performance, a washer structure that contacts the axially outer surface and the radially outer surface of the grooved elastic seal member is disposed on the axially outer side of the grooved elastic seal member. The washer structure is configured to be able to rotate integrally with the through nut, and the through nut, the washer structure, and the grooved elastic seal member are rotated together with a rotation operation for tightening the through nut. It is preferable.

  The fastener of the present invention is attached to a tip end of a bolt inserted through a bolt hole formed in a flange portion of a fluid pipe or a fluid device, and is fastened to fasten the flange portions while sealing the bolt hole. A ring-shaped elastic seal member having a seal surface for intimate contact with a peripheral portion of the bolt hole, a through nut for attaching to the tip of the bolt, and an axially outer surface of the elastic seal member And a washer structure that contacts a radially outer surface, and a groove corresponding to a thread groove formed at a tip of the bolt is formed on the inner peripheral surface of the elastic seal member, and the washer structure Is configured to be rotatable integrally with the through nut.

  As the “bolt” herein, a headed bolt such as a hexagonal bolt, a double screw bolt having no head, or a full screw bolt can be used.

  According to this configuration, since the elastic seal member having a groove on the inner peripheral surface rotates together with the through nut and is appropriately screwed into the bolt, it is possible to improve the water stop performance. Nevertheless, since the through nut can be used, the space occupied by the nut can be reduced as compared with the case where the cap nut is used.

  As a specific configuration for realizing the washer structure, the washer structure is integrally formed with the through nut.

The figure which shows an example of the existing fluid piping system. The figure which shows a mode that a one part apparatus was removed with respect to the system | strain of FIG. 1A. The figure which shows a mode that another fluid apparatus was flange-joined with respect to the fluid apparatus of FIG. 1B. The figure which shows the penetration process of 1st Embodiment of this invention. FIG. 2B is an enlarged cross-sectional view schematically showing the next fastening step of FIG. 2A. FIG. 2B is an enlarged cross-sectional view schematically showing the next fastening step of FIG. 2B. The expanded sectional view which shows typically the fastening process of the other example of 1st Embodiment. The expanded sectional view which shows typically the fastening process which concerns on embodiment other than the above. The expanded sectional view which shows typically the fastening process of 2nd Embodiment. Explanatory drawing which shows the malfunction by a prior art example.

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

<First Embodiment>
As shown in FIG. 1A, in the present embodiment, a first fluid device 11 (gate valve) is connected to the fluid pipe 10 via a flange portion, and an air valve 13 is connected to the first fluid device 11 via a flange. When connected, the air valve 13 is temporarily removed as shown in FIG. 1B, and the second fluid device 12 (repair valve) is connected to the flange of the first fluid device 11 as shown in FIG. 1C. A case where a new air valve 13 is connected to the second fluid device 12 will be described as an example.

  In general, as shown in FIG. 1C, in the flange joint, the head bolt 102 is inserted into the bolt hole 15 formed in the flange portions 10f and 11f, and the nut 3 is attached to the tip of the head bolt 102. The nut 102 and the nut 3 are tightened to fasten both. However, in this embodiment, as shown in FIG. 6, the headed bolt 102 is used for the flange joint of the first fluid device 11 and the second fluid device 12 to interfere with the fluid devices 11 and 12. I can't.

  Therefore, in the present embodiment, the first fluid device 11 and the second fluid device 12 are fastened as follows.

  The bolt includes a headed bolt 102 such as a hexagonal bolt (see FIG. 6) and a headless bolt such as a double screw bolt or a full screw bolt. In this embodiment, first, as shown in FIG. 2B, the insertion process is executed using both screw bolts 2 having grooved side surfaces 2b at both ends and grooveless side surfaces 2c at the center. As shown in FIG. 2B, the insertion step is a step of passing both screw bolts 2 through the bolt holes 15 so that the groove-free side surface 2c is exposed to the outside in the axial direction from the flange surface 16 of at least one flange portion 12f. In the present embodiment, as shown in FIG. 2A, the flange portion 11f of the first fluid device 11 and the flange portion 12f of the second fluid device 12 are spaced apart from each other on the butting surface side (joint surface) of the flange portion. Both screw bolts 2 are inserted into the bolt holes 15 from the side). After insertion, the flange portions 11f and 12f of both fluid devices 11 and 12 are brought into contact with each other. According to this method, even if there is a possibility that both screw bolts 2 and the box portions of the fluid devices 11 and 12 interfere with each other, both screw bolts 2 can be reliably inserted into the bolt holes 15. When the fluid devices 11 and 12 and the two screw bolts 2 do not interfere with each other, the both screw bolts are brought into contact with the flange portion 11f of the first fluid device 11 and the flange portion 12f of the second fluid device 12. 2 may be inserted through the bolt hole 15.

  Next, a fastening step is performed in which the ring-shaped elastic seal member 4 shown in FIG. 2B is interposed between the flange surface 16 and the nut 3 is fastened to both ends of the screw bolts 2. In this fastening process, as shown in FIG. 2B, when the grooveless side surface 2c is exposed from the flange surface 16, a through nut 30 is used to connect the inner peripheral surface 4a of the elastic seal member 4 to the grooveless side surface 2c. Tighten while touching. Between the through nut 30 and the elastic seal member 4, a ring-shaped washer 5 that contacts the axially outer side surface 4 b and the radial outer side surface 4 c of the elastic seal member 4 is interposed. The elastic seal member 4 is also called a so-called O-ring and is formed of an elastic member such as rubber. The washer 5 is formed of a material (for example, metal) harder than the elastic member, and is manufactured by sheet metal processing or casting, for example.

  Next, in the fastening process with respect to the other end portions of both screw bolts 2, as shown in FIG. 2C, when the grooveless side surface 2 c is not exposed from the flange surface 16, the cap nut 31 is used and the elastic seal member 4 is used. Are fastened in contact with the flange surface 16 and the cap nut 31.

  Thus, when the groove-less side surface 2c of both screw bolts 2 is exposed from the flange surface 16 of the one flange portion 12f and not exposed from the flange surface 16 of the other flange portion 11f, as shown in FIG. 2C. One side is fastened with a through nut 30 and the other side is fastened with a cap nut 31.

  On the other hand, as shown in FIG. 3, the thicknesses of both flange portions 11f and 12f are different from those in FIG. 2C, and the groove-less side surfaces 2c of both screw bolts 2 are respectively separated from the flange surfaces 16 of both flange portions 11f and 12f. When exposed, the through nuts 30 and 30 are fastened to both ends of both screw bolts 2.

  Further, as shown in FIGS. 3 and 4, in the fastening process, when the through nut 30 is used because the groove-less side surface 2c is exposed from the flange surface 16, depending on the thickness of the flange portions 11f and 12f. The spacer 6 may be interposed between the elastic seal member 4 and the through nut 30.

  In addition, it is preferable to attach the pipe reinforcement metal fitting shown in the design registration No. 1305825 to a flange part, after fastening flange parts with both screw bolts and nuts in said procedure. Although detailed description is omitted, as shown in FIG. 1C, a packing 71 such as a rubber plate is bonded in a ring shape with an adhesive and disposed at the distal end portion in the radial direction of the flange portion. A plurality of divided pieces constituting the pipe reinforcing metal fitting 70 are fastened with a headed bolt and a through nut (not shown). In this case, as shown in FIG. 2A, in a state where the flange portion 11f of the first fluid device 11 and the flange portion 12f of the second fluid device 12 are separated from each other, the ring-shaped rubber packing is attached to any one of the flange portions. The rubber packing that has been deposited may be returned to the flange portion after fitting and depositing on both the flanges.

  As described above, the method of fastening the fluid devices according to the present embodiment is such that the bolt 2 is inserted into the bolt hole 15 formed in the flange portions 11 f and 12 f of the fluid devices 11 and 12, and the nut is inserted at the tip of the bolt 2. 3 and tightening the bolt 2 and the nut 3 to fasten the fluid devices 11 and 12, both screw bolts 2 having a groove-less side surface 2c in the central portion are used as bolts, and the groove-less side surface 2c is at least An insertion step of passing both screw bolts 2 through the bolt holes 15 so as to be exposed axially outward from the flange surface 16 of one flange portion 12f, and a ring-shaped elastic seal member 4 interposed between the flange surfaces 16 When the nut 3 is fastened to both ends of the screw bolts 2 and the groove-less side surface 2c is exposed from the flange surface 16, a through nut 30 is used to When the inner peripheral surface 4a of the member 4 is fastened in contact with the grooveless side surface 2c, but the grooveless side surface 2c is not exposed from the flange surface 16, the cap nut 31 is used to elastically seal the member 4 And a fastening step of fastening in a state where the flange is brought into contact with the flange surface 16 and the cap nut 31.

According to this method, both screw bolts 2 are arranged such that the grooveless side surface 2c is exposed axially outward from the flange surface 16 of at least one flange portion 12f, and the grooveless side surface 2c is exposed from the flange surface 16. In this case, since the through nut 30 is used, the through nut 30 is always used for at least one of the two nuts attached to both ends of the both screw bolts 2. The through nut 30 is generally smaller in axial direction than the cap nut 31 and is low in cost. Therefore, the axial dimension of the space occupied by the nut can be reduced as compared with the case where the cap nut 31 is used for both, and it is possible to reduce the trouble that interferes with other devices and to reduce the cost.
Nevertheless, when the through nut 30 is used, if the grooved side surface 2b of the bolt 2 and the inner peripheral surface 4a of the elastic seal member 4 come into contact with each other, there is a risk of water leakage from the portion. Since 2c and the inner peripheral surface 4a of the elastic seal member 4 are in contact with each other, water leakage between the screw bolts 2 and the seal member 10 can be prevented.
Further, when the groove-less side surface 2c is not exposed from the flange surface 16, the cap nut 31 is used. Therefore, even if water leaks between the elastic seal member 4 and both screw bolts 2, the cap nut 31 appropriately stops. I can water.
Furthermore, since the through nut 30 and the cap nut 31 are properly used depending on whether or not the groove-less side surface 2c is exposed from the flange surface 16, it is possible to cope with various thicknesses of the flange with a kind of both screw bolts 2. It is not necessary to use both screw bolts individually according to the flange, and the cost is low.
Therefore, it is possible to accurately seal the bolt hole and reduce the trouble that the nut interferes with the peripheral device while suppressing the cost.

  In particular, in the present embodiment, in the insertion step, the screw bolts 2 are inserted into the bolt holes 15 from the butting surface side (joining surface side) of the flange portion 12f in a state where the fluid devices 11 and 12 are separated from each other. If it does in this way, even if the box part of fluid equipment 11 and 12 and both screw bolts 2 interfere, it will become possible to insert both screw bolts 2 in bolt hole 15 exactly.

  Further, in the present embodiment, in the fastening process, when the through nut 30 is used because the grooveless side surface 2 c is exposed from the flange surface 16, the spacer 6 is interposed between the elastic seal member 4 and the through nut 30. Intervene. In this way, the elastic seal member 4 can be adjusted according to the thickness of the flange portions 11f and 12f in the field so that the elastic seal member 4 does not interfere with the grooved side surface 2b. On the other hand, common bolts and nuts can be used, and manufacturing costs can be reduced by sharing parts.

  The present invention is not limited to the embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention.

Second Embodiment
For example, as shown in FIG. 2C, in the fastening step of the first embodiment, the cap nut 31 is used when the groove-less side surface 2c is not exposed from the flange surface 16, but in the second embodiment, As shown in FIG. 5, a through nut 32 is used instead of the cap nut 31. Furthermore, as shown in the figure, a grooved elastic seal member 41 having a groove 41m corresponding to the screw groove 2m of both screw bolts 2 on the inner peripheral surface is used. The through nut 32 is fastened in a state where the screw groove 2m of both screw bolts 2 and the groove 41m of the grooved elastic seal member 41 are engaged. In this case, on the outer side in the axial direction of the grooved elastic seal member 41, a washer structure 5X that is in contact with the axially outer surface 41b and the radial outer surface 41c of the grooved elastic seal member 41 is disposed. The washer structure 5X is configured to be able to rotate integrally with the through nut 32, and the through nut 32, the washer structure 5X, and the grooved elastic seal member 41 are integrally rotated in accordance with a rotation operation for tightening the through nut 32. In the present embodiment, the washer structure 5X and the through nut 32 are integrally formed so that both can be integrally rotated. However, the present invention is not limited to this. For example, the two members may be separate members, and an uneven structure that engages with each other may be provided between the two members so that the two members can rotate integrally. Alternatively, the two may be bonded together with an adhesive or the like so as to be integrally rotatable.

  The above fasteners (through nut 32, elastic seal member 41) are not limited to the flange connection between the fluid devices 11 and 12, but for example, the flange connection between the fluid tubes and the flange connection between the fluid tube and the fluid device. Is available. That is, the fastener (the through nut 32 and the elastic seal member 41) is attached to the front end portion of the bolt inserted into the bolt hole formed in the flange portion of the fluid pipe or fluid device, and the flange portion while sealing the bolt hole. Used to fasten together. The fastener includes a ring-shaped elastic seal member 41 having a sealing surface for intimate contact with the peripheral portion of the bolt hole 15, a through nut 32 for attachment to the tip of the bolt 2, and an axially outer side of the elastic seal member 41. A washer structure 5X that contacts the side surface 41b and the radially outer side surface 41c. On the inner peripheral surface of the elastic seal member 41, a groove 41m corresponding to the screw groove 2m formed at the tip of the bolt 2 is formed. The washer structure 5X is configured to be rotatable integrally with the through nut 32.

  When the inner peripheral surface of the elastic seal member is a flat surface, if the flat surface and the screw grooves of both screw bolts are combined, the gap between the screw grooves is not filled and water cannot be sufficiently stopped. Therefore, by providing grooves 41m and fins corresponding to the thread grooves 2m of the two screw bolts 2 on the inner peripheral surface of the elastic seal member 41, it becomes possible to contact both surfaces and sufficiently stop water.

  On the other hand, when the elastic seal member 41 provided with the groove 41m on the inner peripheral surface is used and the through nut and the washer structure are separate members, the rotational operation force input to the through nut is not input to the elastic seal member, If the elastic seal member 41 is only pushed along the axial direction, the inner peripheral surface of the elastic seal member 41 may be damaged and water stoppage may be impaired. Therefore, by allowing the washer structure 5X contacting the elastic seal member 41 to rotate integrally with the through nut 32, the elastic seal member 41 is also rotated together with the through nut 32, and the inner peripheral surface of the elastic seal member 41 is damaged. The water stop performance has been improved.

  In addition, if the above is used, the through nuts 30 and 32 are used at both ends of both screw bolts 2, so that the axial dimension of the space occupied by the nut can be reduced as compared with the case where the cap nut 31 is used. It is possible to avoid problems due to interference with other devices.

  In the present invention, the fluid pipe is not limited to a water pipe, and may be a fluid pipe through which various liquids and gases flow.

DESCRIPTION OF SYMBOLS 11, 12 ... Fluid equipment 11f, 12f ... Flange part 15 ... Bolt hole 16 ... Flange surface 2 ... Bolt (both screw bolt)
2c: Side surface without groove 2m ... Screw groove of both screw bolts 3 ... Nut 30, 32 ... Through nut 31 ... Cap nut 4 ... Elastic seal member 4a ... Inner circumferential surface of elastic seal member 41 ... Groove elastic seal member 41m ... With groove Elastic seal member groove 6 ... Spacer 5X ... Washer structure

Claims (7)

A bolt is inserted into a bolt hole formed in a flange portion of a fluid device, a nut is attached to a tip portion of the bolt, and the bolt and the nut are tightened to fasten the fluid devices together.
An insertion step of passing both screw bolts through the bolt holes so that the grooveless side surface is exposed to the outside in the axial direction from the flange surface of at least one flange portion as the bolt, using both screw bolts having a groove-less side surface at the center. When,
When a ring-shaped elastic seal member is interposed between the flange surface and the nut is fastened to both ends of the screw bolts, a through nut is used when the grooveless side surface is exposed from the flange surface. When the inner peripheral surface of the elastic seal member is fastened in contact with the grooveless side surface, and the grooveless side surface is not exposed from the flange surface, a cap nut is used, and the elastic seal member is used. A fastening step of fastening the fluid device in contact with the flange surface and the cap nut.   2. The fastening method between fluid devices according to claim 1, wherein in the insertion step, the screw bolts are inserted into the bolt holes from the abutting surface side of the flange portion in a state where the fluid devices are separated from each other.   The spacer is interposed between the elastic seal member and the through nut when the through nut is used because the groove-less side surface is exposed from the flange surface in the fastening step. A method for fastening fluidic devices according to 2 above.   In the fastening step, when the groove-less side surface is not exposed from the flange surface, a through nut is used instead of using the cap nut, and a groove corresponding to the screw groove of the both screw bolts is provided on the inner peripheral surface. The said through nut is fastened in the state which meshed | engaged the thread groove of the said both screw bolt, and the groove | channel of the said elastic seal member with a groove | channel using the elastic seal member with a groove | channel which it has. Fastening method between fluid devices.   A washer structure that contacts the axially outer surface and the radially outer surface of the grooved elastic seal member is disposed on the axially outer side of the grooved elastic seal member, and the washer structure is integrated with the through nut. The fastening method between fluid devices according to claim 4, wherein the fluid device is configured to rotate, and the through nut, the washer structure, and the grooved elastic seal member are integrally rotated in accordance with a rotation operation for fastening the through nut. . A fastener for fastening the flanges together while sealing the bolt holes, attached to the tip of a bolt inserted in a bolt hole formed in a flange part of a fluid pipe or fluid device,
A ring-shaped elastic seal member having a seal surface for intimate contact with a peripheral portion of the bolt hole, a through nut for attachment to the tip of the bolt, and an axial outer surface and a radial outer surface of the elastic seal member A washer structure that contacts the
On the inner peripheral surface of the elastic seal member, a groove corresponding to a screw groove formed at the tip of the bolt is formed,
The washer structure is a fastener configured to be rotatable integrally with the through nut.   The fastener according to claim 6, wherein the washer structure is integrally formed with the through nut.

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