Repair joint device and assembly method thereof

Abstract

The present invention provides a repair joint device (10) that can join split shells (11) by welding and can easily perform welding operations. The repair joint device (10) includes a plurality of split shells (11), each split shell (11) having a split sleeve (11A), a pair of end plates (21) provided at both ends of the split sleeve (11A), and a seal receiving protrusion (22) provided on each end plate (21). A non-protrusion area (23) is formed between the seal receiving protrusions (22). An auxiliary protrusion device (25) is provided in the non-protrusion area (23).

Description

Technical Field

[0001] The present disclosure relates to a repair joint device and an assembly method thereof, which is provided at a leakage site between pipes for circulating liquid and includes a plurality of split shells divided into a plurality of parts in a circumferential direction, and in particular to a repair joint device and an assembly method thereof, in which the split shells can be joined by welding and the welding process can be easily performed. Background Art

[0002] After water pipes or industrial piping are buried, cracks often develop in the gaskets, pipe bodies, or joints, or welds deteriorate due to aging and ground changes. In these cases, the liquid flowing in the pipes may leak.

[0003] Therefore, when liquid leaks from a pipe, it is conceivable to provide a repair joint device that covers the entire joint to be repaired including the leaking portion.

[0004] As such a repair joint device, there is known a device that covers the first pipe and the second pipe constituting the pipe from the outer periphery and includes a plurality of split casings, for example.

[0005] In this case, the repair joint device includes the split housing divided into a plurality of parts, for example, two parts, in the circumferential direction.

[0006] When assembling such a repair joint device, if the divided shells can be joined by welding, the overall structure can be simplified and convenient.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 5-118491

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 2012-37041 Summary of the Invention

[0011] Technical problem to be solved by the invention

[0012] The present disclosure has been made in consideration of such problems, and an object of the present disclosure is to provide a repair joint device and an assembling method thereof, in which split shells constituting the repair joint device can be joined by welding and the welding operation can be performed simply.

[0013] Solutions for solving technical problems

[0014] In the present disclosure, in a repair joint comprising a plurality of split shells that cover the piping from the outer periphery and are divided in the circumferential direction and joined to each other via a joint surface by welding, each split shell comprises: a split sleeve that covers the piping from the outer periphery; a pair of end plates that are arranged at both end portions in the axial direction of the split sleeve; and a seal receiving protrusion that is arranged on the outer surface in the axial direction of each end plate, a seal receiving space being formed between the seal receiving protrusion and the piping, and the seal receiving protrusion extending in the circumferential direction, each seal receiving protrusion not extending to the joint surface, but a non-protrusion area is formed between the seal receiving protrusion of one split shell and the seal receiving protrusion of the other split shell in an adjacent pair of split shells, an auxiliary protrusion device is detachably provided in the non-protrusion area, and an additional seal receiving space is formed between the auxiliary protrusion device and the piping.

[0015] In the present disclosure, in the repair joint device, the auxiliary protrusion device has: an auxiliary protrusion embedded in the protrusion-free area; and an auxiliary fixing member, which holds the auxiliary protrusion and is fixed to the seal receiving protrusion of the one split shell and the seal receiving protrusion of the other split shell.

[0016] In the present disclosure, in the repair joint device, the seal housing protrusion of each split housing is provided with a seal retaining ring metal fitting for retaining a seal ring, and the seal ring is mounted in the seal housing space and the additional seal housing space.

[0017] In the present disclosure, in the repair joint device, the seal ring includes a pair of split seal rings divided into two via a contact surface.

[0018] In the present disclosure, in an assembling method of a repair joint device including a plurality of split shells that cover a pipe from the outer periphery and are split in the circumferential direction and joined to each other via a joint surface by welding, the assembling method of the repair joint device includes: a step of preparing a plurality of split shells, each split shell having: a split sleeve that covers the pipe from the outer periphery; a pair of end plates that are provided at both axial end portions of the split sleeve; and a seal receiving protrusion that is provided on the axial outer surface of each end plate, a seal receiving space being formed between the seal receiving protrusion and the pipe, and the seal receiving protrusion being provided at the circumferential direction Extension, wherein the seal receiving protrusion of each split shell does not extend to the joint surface; a process of arranging each split shell on the periphery of the piping, wherein a protrusion-free area is formed between the seal receiving protrusion of one split shell and the seal receiving protrusion of the other split shell in a pair of adjacent split shells; a process of joining a pair of split shells via the joint surface by welding; a process of removing the welding excess height remaining on the joint surface of a pair of split shells; and a process of arranging an auxiliary protrusion device in the protrusion-free area to form an additional seal receiving space between the auxiliary protrusion device and the piping.

[0019] In the present disclosure, in the repair joint device assembling method, the weld bead remaining in at least the non-protrusion region and the portion corresponding to the additional seal housing space in the joining surfaces of the pair of split housings is removed.

[0020] In the present disclosure, the assembly method of the repair joint device also includes the process of embedding the sealing ring into the seal storage space of each split shell and the additional seal storage space, and setting the seal pressure ring metal part that holds the sealing ring on the seal storage protrusion.

[0021] Effects of the Invention

[0022] According to the present disclosure, the overall structure can be simplified and the sealing performance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a perspective view showing the repair joint device according to this embodiment.

[0024] Figure 2 It is a side view showing the repair joint device.

[0025] Figure 3 It is a perspective view showing a divided casing.

[0026] Figure 4 This is a perspective view showing a state in which a pair of split casings are arranged on the outer peripheries of the first pipe and the second pipe and welded together.

[0027] Figure 5 It shows Figure 4 An enlarged view of the split shell is shown.

[0028] Figure 6 This diagram shows how the weld reinforcement of the split shell is removed using a grinding machine.

[0029] Figure 7 This is a diagram showing that an auxiliary protrusion device is provided in a non-protrusion area of a split shell.

[0030] Figure 8 This is a diagram showing the auxiliary protrusion device being fixed.

[0031] Figure 9 This is a diagram showing a state where a seal ring is fitted into a split case. DETAILED DESCRIPTION

[0032] <Present embodiment>

[0033] Below, through Figures 1 to 9 The repair joint device according to this embodiment will be described.

[0034] like Figure 1 as well as Figure 2 As shown, the repair joint device 10 of this embodiment includes multiple, for example, two split shells 11, 11, which cover from the outer periphery a cylindrical leakage pipe (first piping) 1 having an axis passing through the center and a cylindrical leakage pipe (second piping) 2 having an axis passing through the center.

[0035] The two split cases 11 , 11 are divided into two in the circumferential direction and are joined to each other by welding via a joining surface 13 .

[0036] The upper split shell 11 constitutes the upper half of the repair joint device 10 , and the lower split shell 11 constitutes the lower half of the repair joint device 10 .

[0037] Further, if Figure 1 as well as Figure 2 As shown, each split shell 11 includes: a semi-cylindrical split sleeve 11A covering the first pipe 1 and the second pipe 2 from the outer periphery, an end plate 21 provided at one end of the split sleeve 11A on the first pipe 1 side along the axial direction, and an end plate 21 provided at the other end on the second pipe 2 side.

[0038] It should be noted that the repair joint device 10 is primarily intended to address leakage of liquid from the joint surface 3 between the first pipe 1 and the second pipe 2, but it can also address leakage caused by damage to either the first pipe 1 or the second pipe 2. In this case, the repair joint device 10 is provided to cover the outer periphery of the damaged first pipe 1 or the second pipe 2.

[0039] As described above, a pair of end plates 21, 21 are provided at both axial ends of the split sleeve 11A of each split housing 11. Furthermore, a seal-receiving protrusion 22 is provided on the axial outer surface of each end plate 21, 21, forming a seal-receiving space 35 between the seal-receiving protrusion 22 and the corresponding first pipe 1 or second pipe 2. The seal-receiving protrusion 22 extends circumferentially along the axial outer surface of each end plate 21, 21, and a seal ring 30, described later, is inserted into the seal-receiving space 35.

[0040] However, each seal-receiving protrusion 22 does not extend to the joint surface 13 between the split housings 11. Instead, protrusion-free regions 23, 23 are formed between the seal-receiving protrusion 22 of one split housing 11 and the seal-receiving protrusion 22 of the other split housing 11 in a pair of adjacent split housings 11. The protrusion-free regions 23, 23 formed between the seal-receiving protrusion 22 of one split housing 11 and the seal-receiving protrusion 22 of the other split housing 11 are formed by the protrusion-free region 23 of one split housing 11 and the protrusion-free region 23 of the other split housing 11.

[0041] By providing the non-protrusion areas 23, 23 between the seal receiving protrusions 22, 22 of the split shells 11, 11, when the split shells 11, 11 are welded via the joint surface 13 as described later, the welding work in the split shells 11, 11, especially in the end plates 21, 21, and the work of removing the weld excess height after welding can be facilitated.

[0042] For example, if the end plates 21, 21 of the split housings 11, 11 are not provided with the non-protrusion areas 23, 23, and the seal-receiving protrusions 22, 22 are provided all the way to the joint surface 13, that is, the ends of the end plates 21, 21, welding the end plates 21, 21 becomes cumbersome and removing the weld bead becomes difficult. However, according to this embodiment, by providing the non-protrusion areas 23, 23 between the seal-receiving protrusions 22, 22 of the split housings 11, 11, welding the end plates 21, 21 and removing the weld bead after welding can be facilitated.

[0043] In this way, in the protrusion-free areas 23, 23 formed between the seal storage protrusions 22, 22 of the split shells 11, 11, an auxiliary protrusion device 25 is detachably assembled as described later, and an additional seal storage space 36 is formed between the auxiliary protrusion device 25 and the corresponding first piping 1 or second piping 2.

[0044] The auxiliary protrusion assembly 25 includes an auxiliary protrusion 26 that fits within the non-protrusion region 23, 23 formed between the seal-receiving protrusions 22, 22 of the split housings 11, 11, and an auxiliary fixing member 27 that holds the auxiliary protrusion 26. In this case, the auxiliary protrusion 26 of the auxiliary protrusion assembly 25 forms an additional seal-receiving space 36 between the auxiliary protrusion 26 and the first pipe 1 and the second pipe 2. Furthermore, the auxiliary fixing member 27 is fixedly attached to the auxiliary protrusion 26 by a mounting bolt 28. Furthermore, the auxiliary protrusion assembly 25 thus constructed is attached to the seal-receiving protrusion 22 of each split housing 11, 11 by a mounting bolt 29 that extends through the auxiliary fixing member 27.

[0045] In this case, the mounting bolts 29 extending through the auxiliary fixing member 27 of the auxiliary protrusion device 25 are inserted into the openings 22b formed on the radial outer surface of the seal receiving protrusions 22 provided on the split housings 11, 11 (see FIG. Figure 7 ).

[0046] In addition, Figures 5 to 8 In the embodiment, openings 22 a are also formed in the outer surfaces in the axial direction of the seal housing protrusions 22 , 22 provided on the respective split housings 11 , 11 .

[0047] As described above, by providing the seal receiving protrusions 22, 22 on the split shells 11, 11, a seal receiving space 35 is formed between it and the first pipe 1 and the second pipe 2. In addition, by providing the auxiliary protrusion device 25, an additional seal receiving space 36 is formed between it and the first pipe 1 and the second pipe 2. Sealing rings 30 are installed in these seal receiving spaces 35 and the additional seal receiving space 36.

[0048] Next, the seal ring 30 mounted in the seal housing space 35 and the additional seal housing space 36 will be described. The seal ring 30 is made of elastic rubber and includes a pair of wedge-shaped, divided seal rings 31 and 32. The divided seal rings 31 and 32 contact each other via an inclined contact surface 30a.

[0049] The sealing ring 30 is assembled in the seal receiving space 35 and the additional seal receiving space 36. The seal pressing ring metal member 24 is inserted into the seal receiving space 35, and the bolt 38 is passed through the seal pressing ring metal member 24 via the bolt hole bored in the seal pressing ring metal member 24. Next, the bolt 38 is inserted and tightened into the opening 22a provided on the axial outer surface of the seal receiving protrusion 22. At this time, the split sealing rings 31 and 32 are compressed in the axial direction by the seal pressing ring metal member 24. The split sealing rings 31 and 32 also move in the radial direction via the inclined contact surface 30a, thereby forming the sealing ring 30. The sealing ring 30 abuts against the end plate 21, the seal receiving protrusion 22, the auxiliary protrusion 26 of the auxiliary protrusion device 25, and the corresponding first pipe 1 or second pipe 2.

[0050] In the present embodiment, the inclination angle (wedge angle) of the contact surface 30 a between the divided seal rings 31 and 32 is set to, for example, 45°.

[0051] In this embodiment, the repair joint device 10 seals liquid leaking from the joint surface 3 between the first pipe 1 and the second pipe 2 to be repaired within the repair joint device 10. An air inlet and outlet 47 is provided at the upper end of the repair joint device 10, and a drain port 48 is provided at the lower end. However, these ports are blocked during construction, and the interior of the repair joint device 10 is sealed after the repair.

[0052] The sealing ring 30 will be described in more detail below. Figure 9A cross-sectional view of the seal portion of the split seal rings 31 and 32 that comprise the seal ring 30 is shown during assembly, with no axial pressure applied. Lip-forming grooves 31a and 31b are formed on the axial inner surface and contact surface 30a of one of the opposing wedge-shaped split seal rings 31 and 32, respectively. A lip-forming groove 32a is provided on the bottom surface of the other split seal ring 32. The height of the seal ring 30 is H. When a tightening force is applied axially, the split seal rings 31 and 32 are compressed axially and expanded radially outward, sealing the upper and lower sealing surfaces of the seal receiving space 35 and the additional seal receiving space 36. When a tightening force is applied axially to the opposing contact surfaces 30a, the wedge-shaped contact surfaces 30a are compressed axially and slide radially against each other, increasing the height of the seal ring 30 and, in turn, the sealing pressure. The wedge angle α of the seal ring 30 is approximately 45°. By compressing the seal ring 30 in the axial direction, the seal ring 30 can press the end plate 21 of the divided housings 11, 11 with greater force. Furthermore, by compressing the seal ring 30 in the axial direction, the seal ring 30 presses the seal-receiving protrusion 22 and the auxiliary protrusion 26 of the auxiliary protrusion device 25, and the corresponding first pipe 1 or second pipe 2. As a result, the seal ring 30 can reliably seal the interior of the repair joint device 10.

[0053] Next, through Figures 3 to 9 A method for assembling the repair joint device having such a structure will be described.

[0054] First, if Figure 3 As shown, a pair of split housings 11 are prepared. Each split housing 11 includes a split sleeve 11A that covers the first pipe 1 and the second pipe 2 from its outer periphery; a pair of end plates 21, 21, provided at both axial ends of the split sleeve 11A; and a seal-receiving protrusion 22 provided on the axial outer surface of each end plate 21, forming a seal-receiving space 35 between the seal-receiving protrusion 22 and the first pipe 1 and the second pipe 2. In this case, in each split housing 11, the seal-receiving protrusion 22 does not extend to the joint surface 13 of the split housing 11.

[0055] Next, if Figure 4 as well as Figure 5 As shown, a pair of split housings 11 are arranged around the outer peripheries of the first and second pipes. In this case, in the adjacent pair of split housings 11, projection-free regions 23, 23 are formed between the seal-receiving protrusion 22 of one split housing 11 and the seal-receiving protrusion 22 of the other split housing 11. The projection-free regions 23, 23 formed between the seal-receiving protrusion 22 of one split housing 11 and the seal-receiving protrusion 22 of the other split housing 11 are formed by the projection-free regions 23 of one split housing 11 and the projection-free regions 23 of the other split housing 11.

[0056] Next, the pair of split housings 11 are joined via the joint surfaces 13 by welding. A weld bead 13a is formed along the joint surfaces 13 of the pair of split housings 11 and on the outside of the joint surfaces 13. In this case, since the non-protrusion areas 23, 23 are formed between the seal-receiving protrusions 22, 22 of the split housings 11, 11, welding can be performed more easily in the split housings 11, 11, particularly near the seal-receiving protrusions 22, 22 of the end plates 21, 21, compared to a case where the seal-receiving protrusions 22, 22 are provided on the joint surfaces 13.

[0057] Next, the pair of split shells 11, 11 joined by welding via the joint surface 13 are subjected to a grinding wheel 40 to remove the weld excess 13a remaining along the joint surface 13 (see FIG. Figure 6 ).

[0058] In this case, the weld reinforcement 13a remaining on the joint surface 13 of the pair of split housings 11, 11 is removed using a grinder 40, at least in the non-protrusion areas 23, 23 of the end plate 21 and the portion corresponding to the additional seal accommodation space 36. In this case, since the non-protrusion areas 23, 23 are formed between the seal accommodation projections 22, 22 of the split housings 11, 11, the weld reinforcement 13a on the joint surface 13 can be easily removed using the grinder 40, particularly in the non-protrusion areas 23, 23 between the seal accommodation projections 22, 22 of the end plate 21 and the portion corresponding to the additional seal accommodation space 36.

[0059] In this manner, the weld bead 13a remaining in the non-protrusion areas 23, 23 between the seal-receiving protrusions 22, 22 of the end plate 21, as well as the weld bead 13a remaining in the portion corresponding to the additional seal-receiving space 36, can be reliably removed using the grinder 40. This smoothes the end plate 21 where the auxiliary protrusion 25 abuts, and the end plate 21 where the seal ring 30 abuts within the additional seal-receiving space 36. This improves the adhesion between the end plate 21 and the auxiliary protrusion 25, and between the end plate 21 and the seal ring 30. Furthermore, the use of the seal ring 30 can improve the sealing performance of the repair joint device 10.

[0060] The grinder 40 has a shape such that the working portion 40 a thereof can be inserted into the non-protrusion regions 23 , 23 between the seal-accommodating protrusions 22 , 22 .

[0061] Then, if Figure 7As shown, an auxiliary protrusion device 25 is mounted in the non-protrusion area 23, 23 between the seal receiving protrusions 22, 22, and an additional seal receiving space 36 is formed between the auxiliary protrusion device 25 and the first and second pipes 2. In this case, the additional seal receiving space 36 is formed between the auxiliary protrusion 26 of the auxiliary protrusion device 25 and the first and second pipes 1, 2.

[0062] Next, a mounting bolt 29 is provided through the auxiliary fixing member 27 of the auxiliary protrusion device 25. By inserting the mounting bolt 29 into the opening 22b of the seal receiving protrusion 22, 22, the auxiliary protrusion device 25 is fixed in the pair of split housings 11, 11 (see Figure 8 ).

[0063] Next, if Figure 9 As shown, the seal ring 30 is embedded in the seal housing space 35 and the additional seal housing space 36 of the pair of split housings 11, 11. The seal holding ring 24 that holds the seal ring 30 is then mounted on the seal housing protrusion 22, and a bolt 38 is installed through the seal holding ring 24. The bolt 38 is then inserted into the opening 22a of the seal housing protrusion 22. By tightening the bolt 38, the seal holding ring 24 can press the seal ring 30 along the axial direction.

[0064] Furthermore, by pressing the seal ring 30 in the axial direction, the seal ring 30 can be pressed against the end plate 21 , the seal receiving protrusion 22 , the auxiliary protrusion device 25 , the first pipe 1 , and the second pipe 2 , thereby sealing the interior of the repair joint device 10 .

[0065] As described above, according to this embodiment, the seal-receiving protrusions 22, 22 of the pair of split housings 11, 11 do not reach the joint surface 13, and a non-protrusion region 23, 23 is formed between the seal-receiving protrusions 22, 22 of the pair of split housings 11, 11. Therefore, compared to a case where the seal-receiving protrusions 22, 22 of the pair of split housings 11, 11 reach the joint surface 13, welding along the joint surface 13 can be performed easily and with high precision in the split housings 11, 11, particularly in the end plate 21 near the seal-receiving protrusions 22, 22. Furthermore, after welding, the weld bead 13a remaining along the joint surface 13, particularly in the end plate 21 near the seal-receiving protrusions 22, 22, can be easily removed.

[0066] Furthermore, the weld bead 13a remaining in the non-protrusion areas 23, 23 formed between the seal-receiving protrusions 22, 22 of the pair of split housings 11, 11 and in the portion corresponding to the additional seal-receiving space 36 can be removed and smoothed using a grinder 40. This allows the auxiliary protrusion device 25 to be mounted in close contact with the end plate 21 corresponding to the non-protrusion areas 23, 23, and the seal ring 30 in the additional seal-receiving space 36 to be reliably in close contact with the end plate 21, thereby further improving the sealing performance of the repair joint device 10 using the seal ring 30.

[0067] Description of Reference Numerals

[0068] 1. First piping

[0069] 2 Second piping

[0070] 3 Joint surface

[0071] 10 Repair joint device

[0072] 11 Split Shell

[0073] 11A Split Sleeve

[0074] 13 Joint surface

[0075] 13a Welding reinforcement

[0076] 21 End Plate

[0077] 22 Seal storage protrusion

[0078] 22a Opening

[0079] 22b Opening

[0080] 23 No protrusion area

[0081] 24 Seal pressing ring metal parts

[0082] 25 Auxiliary protrusion device

[0083] 26 Auxiliary protrusion

[0084] 27 Auxiliary fixings

[0085] 28 Mounting bolts

[0086] 29 Mounting bolts

[0087] 30 Sealing ring

[0088] 30a contact surface

[0089] 31 Split sealing ring

[0090] Slot 31a

[0091] 31b slot

[0092] 32 split sealing ring

[0093] 32a slot

[0094] 35 Sealing space

[0095] 36 Additional seal storage space

[0096] 38 bolts

[0097] 40 grinding machines

[0098] 47 Air inlet and outlet

[0099] 48 Drain

Claims

1. A repair joint device comprising a plurality of split shells that cover a pipe from the outer periphery and are split in the circumferential direction and joined to each other via joint surfaces by welding, wherein: Each split shell has: A split sleeve covering the pipe from the outer periphery; a pair of end plates, provided at both ends of the split sleeve in the axial direction; and The seal receiving protrusion is provided on the outer surface of each end plate in the axial direction, and a seal receiving space is formed between the seal receiving protrusion and the pipe, and the seal receiving protrusion extends in the circumferential direction. Each seal receiving protrusion does not extend to the joint surface. In a pair of adjacent split shells, a non-protrusion area is formed between the seal storage protrusion of one split shell and the seal storage protrusion of the other split shell, and an auxiliary protrusion device is freely disassembled in the non-protrusion area to form an additional seal storage space between the auxiliary protrusion device and the piping.

2. The repair joint device according to claim 1, wherein: The auxiliary protrusion device includes: an auxiliary protrusion embedded in the protrusion-free area; and an auxiliary fixing member that holds the auxiliary protrusion and is fixed to the seal accommodating protrusion of the one split shell and the seal accommodating protrusion of the other split shell.

3. The repair joint device according to claim 1 or 2, wherein: The seal housing protrusion of each divided housing is provided with a seal retaining ring metal fitting for retaining a seal ring, and the seal ring is mounted in the seal housing space and the additional seal housing space.

4. The repair joint device according to claim 3, wherein: The seal ring includes a pair of split seal rings divided into two via a contact surface.

5. A method for assembling a repair joint device, the repair joint device comprising a plurality of split shells that cover a pipe from the outer periphery and are split in the circumferential direction and joined to each other via joint surfaces by welding, wherein: The assembly method comprises: The step of preparing a plurality of split housings, each split housing comprising: a split sleeve covering the pipe from its outer periphery; a pair of end plates disposed at both axial ends of the split sleeve; and a seal receiving protrusion disposed on an axial outer surface of each end plate, the seal receiving protrusion forming a seal receiving space between the seal receiving protrusion and the pipe, the seal receiving protrusion extending in a circumferential direction, wherein the seal receiving protrusion of each split housing does not extend to the joint surface; a step of arranging each split housing on an outer periphery of the pipe, wherein a non-protrusion area is formed between the seal accommodating protrusion of one split housing and the seal accommodating protrusion of the other split housing in a pair of adjacent split housings; a step of joining the pair of split shells via the joining surfaces by welding; a step of removing weld reinforcement remaining on the joint surfaces of the pair of split shells; and The step of providing an auxiliary protrusion device in the non-protrusion area to form an additional sealant accommodation space between the auxiliary protrusion device and the pipe.

6. The method for assembling a repair joint device according to claim 5, wherein: The weld bead remaining in at least the non-protrusion region and a portion corresponding to the additional seal accommodating space in the joining surfaces of the pair of split housings is removed.

7. The method for assembling a repair joint device according to claim 5 or 6, wherein: The method further includes the steps of inserting a sealing ring into the sealing member receiving space and the additional sealing member receiving space of each divided housing, and arranging a sealing member pressing ring metal member for holding the sealing ring on the sealing member receiving protrusion.

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