Repair coupling device

Abstract

To provide a joint device 10 for repair having a separation preventing function of a first pipe and a second pipe.SOLUTION: This joint device 10 for repair is provided with a plurality of divided housings 11. A first extension body side 32A having a first lock body side 30A and a second extension body side 32B having a second lock body side 30B are attached to the outside in the axial direction of the plurality of divided housings 11. A first lock ring 25A is attached to the outer periphery of the first pipe 1, and a second lock ring 25B is attached to the outer periphery of the second pipe 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a repair coupling device that is installed between a pair of pipes through which a liquid flows and includes a split housing that is divided into multiple parts in the circumferential direction, and in particular to a repair coupling device that can reliably prevent the pair of pipes from separating. [Background technology]

[0002] After a water pipe or industrial pipe containing a pair of pipes is buried, the liquid flowing inside the pipes may leak from the joint between the pair of pipes due to aging and ground movement.

[0003] Therefore, in preparation for the case where liquid leaks from the pipes, it has been considered to install a repair joint device that covers the entire joint between a pair of pipes.

[0004] As such a repair joint device, for example, one that covers the outer periphery of a first pipe and a second pipe that constitute a pipe and includes a plurality of divided housings is known.

[0005] In this case, if the repair joint device has the function of preventing the pair of pipes from separating from each other, it is possible to prevent the pair of pipes from separating and also to prevent leakage of fluid, which is convenient. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 5-118491 [Patent Document 2] Patent Publication No. 2012-37041 Summary of the Invention [Problem to be solved by the invention]

[0007] The present disclosure has been made in consideration of these points, and aims to provide a repair coupling device that can prevent a pair of pipes from separating and can prevent fluid leakage. [Means for solving the problem]

[0008] The present disclosure relates to a repair joint that outer peripheries a first pipe and a second pipe joined to the first pipe, and the split housings are divided in the circumferential direction and joined to each other, each split housing including a split sleeve that outer peripheries the first pipe and the second pipe, and a first end plate and a second end plate provided at both axial ends of the split sleeve; a first extension body that can be divided in the circumferential direction and provided at one axial end of the split housings to cover the first pipe; and a second extension body that can be divided in the circumferential direction and provided at the other axial end of the split housings to cover the second pipe. a second extension body, wherein the first end plate is provided on the outer periphery of the first pipe, the second end plate is provided on the outer periphery of the second pipe, the first extension includes a first locking body connected to the plurality of split housings via a first connector, and the second extension includes a second locking body connected to the plurality of split housings via a second connector, a first locking ring engageable with the first locking body is provided on the outer periphery of the first pipe between the first end plate and the first locking body, and a second locking ring engageable with the second locking body is provided on the second pipe between the second end plate and the second locking body.

[0009] The present disclosure is a repair coupling device in which the first locking body has a locking body inclined surface, the first locking ring has a locking ring inclined surface that engages with the locking body inclined surface of the first locking body and presses the first locking ring radially inward, the second locking body has a locking body inclined surface, and the second locking ring has a locking ring inclined surface that engages with the locking body inclined surface of the second locking body and presses the second locking ring radially inward.

[0010] The present disclosure relates to a repair joint device in which the inner peripheral surface of the first lock ring is provided with a protrusion that bites into the outer peripheral surface of the first pipe, and the inner peripheral surface of the second lock ring is provided with a protrusion that bites into the outer peripheral surface of the second pipe.

[0011] The present disclosure relates to a repair joint device in which a stopper is provided at the axially inner end of the lock ring inclined surface of the first lock ring, the stopper engaging with the first lock body to stop axial movement of the first lock body, and a stopper is provided at the axially inner end of the lock ring inclined surface of the second lock ring, the stopper engaging with the second lock body to stop axial movement of the second lock body.

[0012] The present disclosure relates to a repair coupling device in which, when the first pipe and the second pipe are joined, when the axial distance between the first locking body and the first locking ring is L1 and the width of the first locking ring is W1, 1×W1≦L1≦5×W1 holds, and when the axial distance between the second locking body and the second locking ring is L2 and the width of the second locking ring is W2, 1×W2≦L2≦5×W2 holds. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to prevent a pair of pipes from coming apart and to prevent leakage of fluid. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a partially cutaway side view showing a repair joint device according to this embodiment. [Figure 2] FIG. 2 is a front view showing the repair joint device. [Figure 3] FIG. 3 is a perspective view showing a split housing. [Figure 4A] FIG. 4A is a cross-sectional view showing a first lock ring. [Figure 4B] FIG. 4B is a cross-sectional view showing the second lock ring. [Figure 5A] FIG. 5A is a front view showing the mounting structure of the first lock ring. [Figure 5B] FIG. 5B is a side view showing the mounting structure of the first lock ring. [Figure 5C] FIG. 5C is a perspective view showing the mounting structure of the first lock ring. [Figure 6] FIG. 6 is an operational diagram showing a state in which the first pipe and the second pipe are displaced in the axial direction. [Figure 7] FIG. 7 is an operational diagram showing a state in which the first pipe and the second pipe are displaced in the axial direction and in the radial direction. [Figure 8A] FIG. 8A is a diagram showing the operation of assembling the split housings. [Figure 8B] FIG. 8B is a diagram showing the operation of assembling the split housings. [Figure 8C] FIG. 8C is a diagram showing the operation of attaching the seal ring. [Figure 8D] FIG. 8D is a diagram showing the operation of attaching the seal ring. [Figure 9A] FIG. 9A is a diagram showing the function of holding the seal ring by the seal ring holder. [Figure 9B] FIG. 9B is a diagram showing the function of holding the seal ring by the seal ring holder. [Figure 9C] FIG. 9C is a diagram showing the function of holding the seal ring by the seal ring holder. [Figure 9D] FIG. 9D is a diagram showing the function of holding the seal ring by the seal ring holder. [Figure 10A] FIG. 10A is a diagram showing the operation of attaching the first lock ring and the second lock ring. [Figure 10B] FIG. 10B is a diagram showing the operation of attaching the first lock ring and the second lock ring. [Figure 10C] FIG. 10C is a diagram showing the action of attaching the first extension body and the second extension body. [Figure 10D] FIG. 10D is a diagram showing the action of attaching the first extension body and the second extension body. DETAILED DESCRIPTION OF THE INVENTION

[0015] <Present Embodiment> The repair joint device according to this embodiment will be described below with reference to FIGS. 1 to 5. FIG.

[0016] As shown in Figures 1 to 5, the repair coupling device 10 of this embodiment covers the outer periphery of a cylindrical first pipe 1 having an axis passing through the center and a cylindrical second pipe 2 also having an axis passing through the center, and is provided with multiple, for example, two, split housings 11, 11 (see Figure 3).

[0017] The two split housings 11, 11 are divided into two parts in the circumferential direction and joined together by welding via a joining surface 13.

[0018] Of these, the upper split housing 11 constitutes the upper half of the repair joint device 10, and the lower split housing 11 constitutes the lower half of the repair joint device 10.

[0019] Furthermore, as shown in Figures 1 and 2, each split housing 11 includes a semi-cylindrical split sleeve 11A that covers the outer periphery of the first pipe 1 and the second pipe 2, a first end plate 21A provided at one end of the split sleeve 11A on the first pipe 1 side along the axial direction, and a second end plate 21B provided at the other end on the second pipe 2 side.

[0020] The repair joint device 10 is mainly intended to deal with leakage of liquid from the joint 3 between the first pipe 1 and the second pipe 2.

[0021] As described above, the first end plate 21A and the second end plate 21B are provided at both axial ends of the split sleeve 11A of each split housing 11. Furthermore, the first end plate 21A and the second end plate 21B are provided with mounting protrusions 24A, 24B on their axial outer surfaces. A plurality of these mounting protrusions 24A, 24B are provided along the circumferential direction (see FIG. 3). The seal ring holder 22A, which holds the seal ring 30, is attached to the mounting protrusion 24A of the first end plate 21A with a mounting bolt 38A. The seal ring 30 held by the seal ring holder 22A seals the gap between the first end plate 21A and the first pipe 1 corresponding to the first end plate 21A.

[0022] Furthermore, a seal ring holder 22B that holds a seal ring 30 is attached to the attachment protrusion 24B of the second end plate 21B with an attachment bolt 38B. The seal ring 30 held by the seal ring holder 22B seals the gap between the second end plate 21B and the second pipe 2 that corresponds to the second end plate 21B.

[0023] As described above, the first pipe 1 and the second pipe 2 are joined to each other via the joint 3. In this embodiment, an extension 51 extending toward the first pipe 1 is provided at the end of the first pipe 1 on the joint 3 side. A seal ring pressing body 52 that holds a seal ring 53 and presses the seal ring 53 toward the extension 51 is attached to the outer periphery of the second pipe 2, and the seal ring pressing body 52 is attached to the extension 51 with a mounting bolt 55.

[0024] In this way, the joint 3 between the first pipe 1 and the second pipe 2 is sealed by the seal ring 53 held between the extension 51 and the seal ring pressing body 52 .

[0025] A first extension body 30A is provided at one axial end of the pair of split housings 11, 11 to cover the first piping 1. This first extension body 30A can be divided into two along the circumferential direction.

[0026] A second extension body 30B is provided at the other axial end of the pair of split housings 11, 11, covering the second piping 2. This second extension body 30B can be divided into two along the circumferential direction.

[0027] Of these, the first extension body 30A has a first lock body 32A connected to one end of the pair of split housings 11, 11 in the axial direction via a first connecting body 31A.

[0028] The second extension body 30B also has a second lock body 32B connected to the other axial end of the pair of split housings 11, 11 via a second connecting body 31B.

[0029] In this embodiment, the first connecting body 31A has a protrusion 33A that engages with the first end plate 21A of the pair of split housings 11, 11, and the second connecting body 31B has a protrusion 33B that engages with the second end plate 21B of the pair of split housings 11, 11.

[0030] In this embodiment, "axial direction" refers to the direction along the axis of the first pipe 1 and the second pipe 2, "outer axial direction" refers to the direction away from the joint 3, and "inner axial direction" refers to the direction approaching the joint 3.

[0031] Furthermore, the "radial direction" refers to the radial direction of the first pipe 1 and the second pipe 2.

[0032] The first locking body 32A of the first extension body 30A is provided circumferentially to cover the outer periphery of the first pipe 1 and is engageable with a first locking ring 25A (described later). The second locking body 32B of the second extension body 30B is provided circumferentially to cover the outer periphery of the second pipe 2 and is engageable with a second locking ring 25B (described later).

[0033] A first lock ring 25A is attached to the outer periphery of the first pipe 1 between the first end plate 21A and the first lock body 32A.

[0034] 5A to 5C, first lock ring 25A is divided into three pieces along the circumferential direction. Each first lock ring 25A has flange portions 46 on both circumferential ends (see FIG. 5A). Adjacent first lock rings 25A are joined to each other by inserting bolts 47 into each other's flange portions 46 and tightening the bolts 47 with nuts 48.

[0035] Like first lock ring 25A, second lock ring 25B is divided into three pieces along the circumferential direction. Second lock ring 25B has flange portions 46 on both circumferential ends. Adjacent second lock rings 25B are joined to each other by inserting bolts 47 into each other's flange portions 46 and tightening the bolts 47 with nuts 48.

[0036] As shown in FIG. 4A, the inner circumferential surface of first lock ring 25A is provided with protrusions 26 that bite into the outer circumferential surface of first pipe 1.

[0037] As shown in FIG. 4B, second lock ring 25B also has protrusions 26 on its inner circumferential surface that bite into the outer circumferential surface of second pipe 2.

[0038] Furthermore, both first locking body 32A and second locking body 32B have locking body inclined surfaces 35 that slope downward toward the outside in the axial direction. Furthermore, corresponding to locking body inclined surfaces 35 of first locking body 32A and second locking body 32B, both first locking ring 25A and second locking ring 25B have locking ring inclined surfaces 27 that slope downward toward the outside in the axial direction.

[0039] First lock ring 25A is pressed radially inward by engagement between lock ring inclined surface 27 of first lock ring 25A and lock body inclined surface 35 of first lock body 32A. This causes protrusion 26 of first lock ring 25A to bite into the outer peripheral surface of first piping 1.

[0040] Furthermore, second lock ring 25B is pressed radially inward by engagement between lock ring inclined surface 27 of second lock ring 25B and lock body inclined surface 35 of second lock body 32B. This causes protrusion 26 of second lock ring 25B to bite into the outer peripheral surface of second piping 2.

[0041] As shown in FIG. 4A, a stopper 28 is provided at the axially inner end of lock ring inclined surface 27 of first lock ring 25A. Stopper 28 engages with first lock body 32A to stop the first lock body 32A from moving inward in the axial direction.

[0042] As shown in FIG. 4B, similar to the first lock ring 25A, a stopper 28 is provided at the axially inner end of the lock ring inclined surface 27 of the second lock ring 25B, which engages with the second lock body 32B to stop the second lock body 32B from moving inward in the axial direction.

[0043] In this way, stopper 28 is provided at the axially inner end of lock ring inclined surface 27 of first lock ring 25A, and stopper 28 is provided at the axially inner end of lock ring inclined surface 27 of second lock ring 25B. This prevents first lock body 32A and second lock body 32B from moving inward in the axial direction. As a result, first lock body 32A and second lock body 32B do not move excessively inward in the axial direction, and therefore first lock ring 25A and second lock ring 25B are not significantly pressed radially inward. As a result, protrusions 26 of first lock ring 25A and second lock ring 25B do not excessively dig into the outer peripheral surfaces of first pipe 1 and second pipe 2, and excessive buckling loads are not applied to first pipe 1 and second pipe 2 in the radial direction.

[0044] In this embodiment, when the three-piece first lock ring 25A is joined together, the protrusions 26 of the first lock ring 25A do not bite into the outer peripheral surface of the first piping 1, but rather abut against the outer peripheral surface of the first piping 1 or are slightly spaced apart from the outer peripheral surface of the first piping 1.

[0045] Furthermore, when the three pieces of the second lock ring 25B are joined together, the protrusions 26 of the second lock ring 25B do not bite into the outer peripheral surface of the second piping 2, but rather abut against the outer peripheral surface of the second piping 2 or are slightly spaced apart from the outer peripheral surface of the second piping 2.

[0046] As described above, the first extension body 30A is divided into two parts along the circumferential direction, and the first extension body 30A can be assembled by inserting an attachment bolt 41 into the flange portions 36A, 36A provided on the first connecting bodies 31A, 31A of each first extension body 30A and tightening this attachment bolt 41 with a nut 42.

[0047] The second extension body 30B is divided into two parts along the circumferential direction, and the second extension body 30B can be assembled by inserting an attachment bolt 41 into the flange portions 36B, 36B provided on the first connecting bodies 31B, 31B of each second extension body 30B and tightening this attachment bolt 41 with a nut 42.

[0048] The seal ring holder 22A, which is attached to the first end plate 21A and holds the seal ring 30, is split into two along the circumferential direction, and the seal ring holder 22A can be assembled by inserting mounting bolts 61 into flange portions 63 provided on each seal ring holder 22A and tightening these mounting bolts 61 with nuts 62 (see Figure 2).

[0049] Similarly, the seal ring holder 22B, which is attached to the second end plate 21B and holds the seal ring 30, is split into two along the circumferential direction, and the seal ring holder 22B can be assembled by inserting an attachment bolt 61 into a flange portion 63 provided on each seal ring holder 22B and tightening this attachment bolt 61 with a nut 62.

[0050] When joining the first pipe 1 and the second pipe 2, if the axial distance between the first lock body 32A and the first lock ring 25A is L1 and the width of the first lock ring 25A is W1, then, for example, 1×W1≦L1≦5×W1.

[0051] Similarly, when joining the first pipe 1 and the second pipe 2, if the axial distance between the second lock body 32B and the second lock ring 25B is L2 and the width of the second lock ring 25B is W2, then, for example, 1×W2≦L2≦5×W2.

[0052] Here, the axial distance between first locking body 32A and first locking ring 25A refers to the distance between the axial center of first locking body 32A and the axial center of first locking ring 25A.

[0053] The axial distance between second locking body 32B and second locking ring 25B refers to the distance between the axial center of second locking body 32B and the axial center of second locking ring 25B.

[0054] By determining the axial distance L1 between the first locking body 32A and the first locking ring 25A and the distance L2 between the second locking body 32B and the second locking ring 25B in this manner, when the first pipe 1 and the second pipe 2 are displaced relative to each other in the axial direction, or when the first pipe 1 and the second pipe 2 are displaced relative to each other in the radial direction, the axial displacement or the radial displacement can be absorbed in either case.

[0055] Next, a method for assembling a repair joint device having such a configuration will be described with reference to FIGS. 8A to 10D.

[0056] 8A, a pair of split housings 11 is prepared, each having a split sleeve 11A that covers the outer peripheries of the first pipe 1 and the second pipe 2, and first end plates 21A and 21B provided at both axial ends of the split sleeve 11A. In this case, a plurality of mounting protrusions 24A and a plurality of mounting protrusions 24B are attached along the circumferential direction to the axial outer surfaces of the first end plate 21A and the second end plate 21B, respectively.

[0057] Next, the pair of split housings 11 are arranged around the outer periphery of the first pipe 1 and the second pipe 2.

[0058] Thereafter, as shown in FIG. 8B, the pair of split housings 11 are joined together via joining surfaces 13 by welding.

[0059] Next, as shown in Figure 8C, a seal ring 30 is provided on the outer periphery of the first pipe 1, axially outward from the first end plate 21A, and similarly, a seal ring 30 is provided on the outer periphery of the second pipe 2, axially outward from the second end plate 21B. In this case, both of the two seal rings 30 are in the form of strings that have been cut in advance at one location, and can be attached to the outer peripheries of the first pipe 1 and the second pipe 2 by adhering the cut portion of the seal ring 30 with adhesive 30a. Thereafter, the two seal rings 30 are moved toward the first end plate 21A and the second end plate 21B (see Figure 8D).

[0060] 9A and 9B, the seal ring 30 is held and fixed by the seal ring holders 22A and 22B. The seal ring holder 22A can be split into two halves, and the seal ring holders 22A are assembled by inserting mounting bolts 61 into flanges 63 provided on each seal ring holder 22A and tightening the mounting bolts 61 with nuts 62 (see FIG. 2).

[0061] Similarly, the seal ring holder 22B can be split into two halves, and the seal ring holder 22B is assembled by inserting mounting bolts 61 into flange portions 63 provided on each seal ring holder 22B and tightening these mounting bolts 61 with nuts 62.

[0062] 9C and 9D, the seal ring holder 22A that holds the seal ring 30 is brought close to the mounting projection 24A of the first end plate 21A and attached to the mounting projection 24A with the mounting bolt 38A. In this way, the seal ring 30 held by the seal ring holder 22A seals the gap between the first end plate 21A and the first piping 1.

[0063] Similarly, a seal ring 30 is provided on the axial outside of the second end plate 21B, and the seal ring holder 22B that holds the seal ring 30 is brought close to the mounting protrusion 24B of the second end plate 21B and attached to the mounting protrusion 24B with mounting bolts 38B. In this way, the seal ring 30 held by the seal ring holder 22B seals the gap between the second end plate 21B and the second piping 2.

[0064] Next, as shown in Figures 10A and 10B, a first lock ring 25A is attached to the outer periphery of the first pipe 1, and a second lock ring 25B is attached to the outer periphery of the second pipe 2.

[0065] The first lock ring 25A is divided into three pieces along the circumferential direction, and adjacent first lock rings 25A are joined to each other by inserting bolts 47 into each other's flange portions 46 and tightening the bolts 47 with nuts 48 (see Figures 5A to 5C).

[0066] Like the first lock ring 25A, the second lock ring 25B is divided into three pieces along the circumferential direction, and adjacent second lock rings 25B are joined to each other by inserting bolts 47 into each other's flange portions 46 and tightening the bolts 47 with nuts 48 (see Figures 5A to 5C).

[0067] Furthermore, when the three pieces of the first lock ring 25A are joined together, the protrusions 26 of the first lock ring 25A do not bite into the outer peripheral surface of the first piping 1, but rather abut against the outer peripheral surface of the first piping 1 or are slightly spaced apart from the outer peripheral surface of the first piping 1.

[0068] Similarly, the protrusions 26 of the second lock ring 25B do not bite into the outer peripheral surface of the second pipe 2, but rather abut against the outer peripheral surface of the second pipe 2 or are slightly spaced apart from the outer peripheral surface of the second pipe 2.

[0069] Next, as shown in FIGS. 10C and 10D, the first extension body 30A is installed at one end of the pair of split housings 11, 11 in the axial direction.

[0070] In this case, the first extension body 30A is divided into two parts along the circumferential direction. Then, mounting bolts 41 are inserted into the flange portions 36A, 36A provided on the first connecting bodies 31A, 31A of each first extension body 30A, and these mounting bolts 41 are tightened with nuts 42. In this manner, the first extension body 30A is assembled (see FIG. 2).

[0071] Similarly, the second extension body 30B is installed at the other end of the pair of split housings 11, 11 in the axial direction.

[0072] In this case, the second extension body 30B is divided into two parts along the circumferential direction. Mounting bolts 41 are inserted into the flanges 36B, 36B provided on the second connecting bodies 31B, 31B of each second extension body 30B, and the mounting bolts 41 are tightened with nuts 42. In this manner, the second extension body 30B is assembled (see FIG. 2).

[0073] During use, as shown in FIG. 6, the first pipe 1 and the second pipe 2 may become separated from each other in the axial direction.

[0074] In this case, the axial distance L1 between first lock body 32A and first lock ring 25A and the axial distance L2 between second lock body 32B and second lock ring 25B are determined, for example, as follows:

[0075] 1×W1≦L1≦5×W1, and 1×W2≦L2≦5×W2 Therefore, the displacement between the first pipe 1 and the second pipe 2 in the axial direction can be absorbed.

[0076] Next, projecting plate 33A engages with first end plate 21A, first locking body 32A abuts against first locking ring 25A, and second locking body 32B abuts against second locking ring 25B.

[0077] In this case, lock ring inclined surface 27 of first lock ring 25A and lock body inclined surface 35 of first lock body 32A engage with each other, and first lock ring 25A is pressed radially inward. This causes protrusion 26 of first lock ring 25A to bite into the outer peripheral surface of first piping 1. In this way, outward movement of first piping 1 in the axial direction is stopped.

[0078] Similarly, lock ring inclined surface 27 of second lock ring 25B and lock body inclined surface 35 of second lock body 32B engage with each other, and second lock ring 25B is pressed radially inward. This causes protrusion 26 of second lock ring 25B to bite into the outer peripheral surface of second piping 2. In this way, outward movement of second piping 2 in the axial direction is stopped. In this way, first piping 1 and second piping 2 do not separate from each other.

[0079] Furthermore, when the first pipe 1 and the second pipe 2 move apart in the axial direction, the first locking body 32A abuts against the stopper 28, preventing the first locking body 32A from moving further inward in the axial direction. As a result, the first locking ring 25A is not significantly pressed radially inward, and an excessive buckling load is not applied to the first pipe 1 in the radial direction.

[0080] Similarly, second locking body 32B does not move further axially inward because it abuts against stopper 28. As a result, second locking ring 25B is not significantly pressed radially inward, and excessive radial buckling load is not applied to second piping 2.

[0081] In this case, as shown in Figure 6, the connection between the first pipe 1 and the second pipe 2 is released, causing the liquid to leak outward from the joint 3. However, because the joint 3 is covered by the split sleeve 11A of the pair of split housings 11, 11 and the first end plate 21A and second end plate 21B, the liquid leaking from the joint 3 does not flow outward.

[0082] However, as shown in FIG. 7, it is conceivable that the first pipe 1 and the second pipe 2 not only move away from each other in the axial direction, but also move in the radial direction.

[0083] In this case, the pair of split housings 11 are slightly inclined with respect to the axial direction outside the first pipe 1 and the second pipe 2. This makes it possible to reliably absorb radial displacement between the first pipe 1 and the second pipe 2.

[0084] As described above, according to this embodiment, the relationship between the distance L1 between first lock body 32A and first lock ring 25A and the width W1 of first lock ring 25A can be set, for example, as follows: 1×W1≦L1≦5×W1, The relationship between the distance L2 between the second lock body 32B and the second lock ring 25B and the width W2 of the second lock ring 25B is, for example, The condition is 1×W2≦L2≦5×W2.

[0085] As a result, when the first pipe 1 and the second pipe 2 are separated from each other along the axial direction, the displacement between the first pipe 1 and the second pipe 2 in the axial direction can be absorbed.

[0086] In the present embodiment, the axial distance L1 between the first locking body 32A and the first locking ring 25A and the axial distance L2 between the second locking body 32B and the second locking ring 25B are the same, but they may be different from each other.

[0087] Furthermore, the width W1 of first lock ring 25A and the width W2 of second lock ring 25B are the same, but may be different from each other.

[0088] Furthermore, when the first pipe 1 and the second pipe 2 move further apart, the lock ring inclined surface 27 of the first lock body 32A and the lock body inclined surface 35 of the first lock body 32A engage with each other, and the protrusion 26 of the first lock ring 25A bites into the outer peripheral surface of the first pipe 1.

[0089] Similarly, the lock ring inclined surface 27 of the second lock body 32B and the lock body inclined surface 35 of the second lock body 32B engage with each other, and the protrusion 26 of the second lock ring 25B bites into the outer peripheral surface of the second pipe 2.

[0090] In this way, the first pipe 1 and the second pipe 2 can be prevented from being separated from each other.

[0091] Furthermore, when the first pipe 1 and the second pipe 2 are further separated from each other in the axial direction, the first locking body 32A comes into contact with the stopper 28, and the second locking body 32B comes into contact with the stopper 28. As a result, the first locking ring 25A and the second locking ring 25B are not significantly pressed radially inward, and an excessive buckling load is not applied to the first pipe 1 and the second pipe 2 in the radial direction. [Explanation of symbols]

[0092] 1. First piping 2. Second piping 3 Joint 10 Repair joint device 11 Split housing 11A Split Sleeve 13 Joint surface 21A 1st end plate 21B 2nd end plate 22A, 22B Seal ring holder 24A, 24B Mounting protrusions 25A First lock ring 25B Second lock ring 26 Protrusion 27 Lock ring inclined surface 28 Stopper 30 Seal ring 30A 1st extension body 30B 2nd extension body 31A 1st connection body 31B 2nd connection body 32A First locking body 32B Second locking body 33A, 33B veneer 35 Lock body inclined surface 36A, 36B flange 38A, 38B Mounting bolts 41 Mounting bolt 42 Nut 47 volts 48 Nut 51 Extension 52 Seal ring pressing body 53 Seal ring

Claims

1. A repair joint that covers an outer periphery of a first pipe and a second pipe joined to the first pipe, a plurality of split housings that are circumferentially separated and joined to one another, each split housing including a split sleeve that outer circumferentially covers the first pipe and the second pipe, and a first end plate and a second end plate provided at both axial ends of the split sleeve; a first extension body that can be separated in a circumferential direction and is provided at one axial end of each of the plurality of split housings to cover the first pipe; a second extension body that can be separated in the circumferential direction and is provided at the other axial end of the plurality of split housings to cover the second piping, the first end plate is provided on an outer periphery of the first pipe, and the second end plate is provided on an outer periphery of the second pipe, the first extension body includes a first locking body connected to the plurality of split housings via a first connecting body; the second extension body includes a second locking body connected to the plurality of split housings via a second connecting body; a first locking ring is provided on the outer periphery of the first pipe between the first end plate and the first locking body, the first locking ring being engageable with the first locking body; and a second locking ring is provided on the second pipe between the second end plate and the second locking body, the second locking ring being engageable with the second locking body.

2. the first locking body has a locking body inclined surface, the first lock ring has a lock ring inclined surface that engages with the lock body inclined surface of the first lock body and presses the first lock ring radially inward, The second locking body has a locking body inclined surface, 2. The repair joint device according to claim 1, wherein the second lock ring has a lock ring inclined surface that engages with the lock body inclined surface of the second lock body to press the second lock ring radially inward.

3. a protrusion that bites into the outer peripheral surface of the first pipe is provided on an inner peripheral surface of the first lock ring; 3. The repair joint device according to claim 2, wherein the inner peripheral surface of the second lock ring is provided with a protrusion that bites into the outer peripheral surface of the second pipe.

4. a stopper that engages with the first lock body and stops the axial movement of the first lock body is provided at an axially inner end of the lock ring inclined surface of the first lock ring, 4. A repair coupling device according to claim 2 or 3, wherein a stopper is provided at an axially inner end of the lock ring inclined surface of the second lock ring, the stopper engaging with the second lock body to stop axial movement of the second lock body.

5. When the first pipe and the second pipe are joined, the axial distance between the first lock body and the first lock ring is defined as L1, and the width of the first lock ring is defined as W1. 1×W1≦L1≦5×W1, When the axial distance between the second lock body and the second lock ring is L2 and the width of the second lock ring is W2, 1×W2≦L2≦5×W2.

2. The repair joint device of claim 1.

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