JP6713287B2 - Repair joint - Google Patents

Description

The present invention relates to a repair joint installed at a leak site between a first pipe and a second pipe that circulate a liquid, and can be easily installed especially when the outer diameter of any pipe changes. Regarding repair joints.

After burying water pipes and industrial pipes, cracks and wear due to aging of the packing, pipes or joints, corrosion, impact, deterioration of welds due to aging and ground fluctuations Cause leakage. A typical conventional method as a repair method when a leak occurs is to cut out a defective portion and replace it in some cases, and a damaged or worn portion is renewed to be restored to a conventional pipeline. Generally, in the pipeline where water and industrial liquid materials are distributed, when such repair occurs, the distribution must be interrupted, and the life or downstream life of the pipeline system in general. There is an inconvenience that interferes with sales. Also, in order to replace the target body, it is necessary to give some care to the adjacent body connected to the body, so the total man-hour is large, especially for buried pipes. Requires a remarkably large man-hour.

Therefore, as a means for improving the method of dealing with leakage from the pipe that circulates the liquid, a repair joint that covers the entire joint to be repaired including the leaked portion has been proposed.

As such a repair joint, one that covers the first pipe and the second pipe from the outer periphery and includes a plurality of split housings is known.

Such a repair joint includes the above-mentioned split housing divided into a plurality of, for example, two in the circumferential direction.

Usually, the leakage site is formed between the first pipe and the second pipe, and the repair joint is installed on the outer periphery of the first pipe and the second pipe so as to straddle the first pipe and the second pipe. The repair joint is produced according to the outer diameters of the first pipe and the second pipe, and must be produced each time the outer diameter of the second pipe changes, for example.

JP-A-5-118491 JP 2012-37041A

http://www.victaulic.co.jp/products/repair_rs.html, "Repair joint, repair sleeve RS type product catalog" "Nippon Victory Co., Ltd., homepage, July 15, 2015"

The present invention has been made in consideration of such a point, and can be easily adjusted and used even if the outer diameter of the second pipe of the first pipe and the second pipe changes, for example. The purpose is to provide a repair joint.

The present invention covers a first pipe and a second pipe from the outer circumference, and in a repair joint including a plurality of split housings, each split housing has a split sleeve that covers the first pipe and the second pipe from the outer circumference, A first plate that includes an end plate that is provided at one end of the split sleeve and a mounting plate that is provided at the other end of the split sleeve, and that accommodates a first seal ring between the end plate and the first pipe. A first connecting plate that forms a seal space is provided, an opposing end plate that is paired with the end plate is detachably provided on the mounting plate, and the second end is provided between the opposing end plate and the second pipe. The repair joint is characterized in that a second connecting plate that forms a second seal space for accommodating the seal ring is provided.

The present invention is the repair joint, wherein the axis of the first pipe and the axis of the second pipe are not parallel to each other.

The present invention is the repair joint, wherein the axis of the first pipe and the axis of the second pipe are parallel to each other.

According to the present invention, of the first pipe and the second pipe, for example, even if the outer diameter of the second pipe changes, it can be easily adjusted and used.

FIG. 1 is a schematic front view showing a repair joint according to a first embodiment of the present invention. FIG. 2 is a schematic side view showing the repair joint according to the first embodiment of the present invention. FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a schematic view showing a case where the axial pressure of the seal ring cross section of the repair joint according to the first embodiment of the present invention is not applied. FIG. 5: is a schematic diagram which shows the case where the axial pressure of the seal ring cross section of the repair joint which concerns on the 1st Embodiment of this invention is loaded. FIG. 6 is a schematic view showing a case where the axial pressure of the seal ring cross section of the repair joint according to the first embodiment of the present invention is applied at an intermediate level between that of FIGS. 4 and 5. FIG. 7 is a schematic side view of a repair joint according to a modification of the present invention. FIG. 8 is a schematic side view showing a repair joint according to the second embodiment of the present invention.

<First Embodiment>
Hereinafter, a repair joint according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 2, the repair joint 10 according to the present embodiment has a cylindrical leak pipe (first pipe) 1 having an axis passing through the center and a cylindrical leak pipe (second pipe having an axis passing through the center). And a plurality of, for example, two split housings 11, 11 are included.

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

Further, as shown in FIG. 3, each split housing 11 is provided at a semi-cylindrical split sleeve 11A that covers the first pipe 1 and the second pipe 2 from the outer circumference, and one end of the split sleeve 11A on the first pipe 1 side. It is provided with an end plate 21a and a mounting plate 22 provided at the other end of the split sleeves 11, 11 on the second pipe 2 side.

A first connecting plate 41a that forms a first seal space 25a for accommodating the first seal ring 30a is attached to the end plate 21a. Further, the mounting plate 22 is provided with an opposed end plate 21b which is paired with the end plate 21a so as to be detachable from the mounting plate 22 with bolts 42 and nuts 43. Further, a second connecting plate 41b that forms a second seal space 25b for accommodating the second seal ring 30b with the second pipe 2 is attached to the facing end plate 21b.

By the way, the first pipe 1 to be repaired, which extends to the right in FIG. 2, and the second pipe 2 to be repaired, which extends to the left in FIG. It is connected. Further, the first pipe 1 and the second pipe 2 to be repaired have a bend at a joint portion due to some reason and exhibit a bend angle (see θ° in FIG. 2 ). That is, the axis of the first pipe 1 and the axis of the second pipe 2 are not parallel.

If the predetermined allowable value for the relative bending angle of the first pipe 1 and the second pipe 2 with respect to the repair joint 10 is set to 2.5°, 2.5°±2. 5°, that is, 0° to 5°, which can be applied to the bend range of the first pipe 1 and the second pipe 2 to be repaired.

It is assumed that liquid leakage at this portion is found at the joint portion of the first pipe 1 and the second pipe 2. In the upper part of FIG. 2, a schematic vertical sectional view of the repair joint 10 of the present invention is shown. A schematic side view of the repair joint 10 as seen from the outside is shown in the lower portion of FIG.

As described above, the repair joint 10 of the present invention is installed so as to hermetically cover the outer periphery of the repair target first pipe 1 and the second pipe 2 of the repair target 3, and each split housing 11 is divided into an upper portion and a lower portion. These are connected by bolts 13 and nuts 14 (see FIG. 1). As shown in FIG. 2, the upper and lower split housings 11 of the repair joint 10 and the first pipe 1 form a first seal space 25 a between the first connecting plate 41 a and the second pipe 2. And a second connecting plate 41b that forms a second seal space 25b between them and the first seal space 25a and the second seal space 25b are formed in an annular shape. The first seal ring 30a housed in the first seal space 25a and the second seal ring 30b housed in the second seal space 25b are made of elastic rubber. The first seal ring 30a and the second seal ring 30b each include seal rings 31 and 32 having a wedge shape.

Next, the first seal ring 30a housed in the first seal space 25a and the second seal ring 30b housed in the second seal space 25b will be described.
The first seal ring 30a and the second seal ring 30b are housed in the first seal space 25a and the second seal space 25b, and the seal holding ring fittings 24a and 24b are placed in the first seal space 25a and the second seal space 25b. The bolts 23a and 23b are fitted and fastened with nuts through the bolt holes formed in the circumferential direction of the seal pressing ring fittings 24a and 24b. At this time, the seal retaining ring fittings 24a, 24b compress the seal rings 31, 32 in the axial direction, and the wedge portions facing each other slide up, so that the seal ring groove top surface, the seal ring groove bottom surface, and the axial A hermetic seal is formed on the side surface of the seal groove surface (see FIGS. 4 to 6). 4 to 6 show the structure of the first seal ring 30a, the second seal ring 30b also has substantially the same structure as the first seal ring 30a.

In this case, the wedge angles α of the seal rings 31 and 32 are formed to 37.5°, and a margin of about 30% is produced as compared with 30° which has been conventionally used.

The repair joint 10 forms a circular cavity when the split housings 11 are connected, but the left and right circular axis cores are formed to intersect with each other. In this embodiment, the split housing 11 is formed with the crossing angle θ of 2.5°. If the crossing angle is 0°, both end plates of the repair joint are machined at 90° with respect to the left and right axes. In the present embodiment, the split housing 11 of the upper half portion is divided. The angle A between the sleeve 11A and the end plate 21a is formed as 88.75°, and the angle A between the split sleeve 11A and the end plate 21a of the lower split housing 11 is formed as 91.25°. When the repair joint 10 is assembled, a crossing angle of 2.5° is generated in total on the left and right sides.

As described above, in this embodiment, the repair joint 10 has a crossing angle of 2.5°, and the fitting angles of the repair target pipes 1 and 2 are adapted to the bending angle θ° within a range allowed by the elasticity of the seal rings 31 and 32. Sealing surfaces at the opposing wedge portions 31 and 32, the outer surfaces of the first pipe 1 and the second pipe 2 to be repaired that face the seal receiving portion 20, and the inner hole portions of the first seal space 25a and the second seal space 25b. Is formed, and the transportation liquid leaking from between the first pipe 1 and the second pipe 2 to be repaired is sealed in the repair joint 10. An air inlet/outlet 47 is provided at the upper end of the repair joint 10 and a drain drain port 48 is provided at the lower end thereof, but these are closed at the time of construction, and the interior of the repair joint 10 is in a sealed state after the repair.

FIG. 4 is a sectional view of a seal portion at the time of assembly when axial pressure is not applied to the seal rings 31 and 32 that form the first seal ring 30a. Grooves (lips) 34 are formed on the upper surface of one seal ring 31 of the wedge-shaped seal rings 31, 32 that are arranged to face each other, and grooves (lips) 35, 33 are formed on the slope and bottom surface of the other seal ring 34. The height of each first seal ring 30a is H. When the fastening force is applied in the axial direction, the seal rings 31 and 32 are compressed and expanded in the axial direction to seal the upper and lower sealing surfaces of the first seal space 25a. The wedge-shaped slopes are compressed axially on the slopes facing each other when a fastening force is applied in the axial direction, and slide up, the height of the first seal ring 30a becomes H″, and the sealing pressure further increases. Since α is formed at 37.5°, the sliding effect is increased as compared with the case where it is formed at 30°, so that the sealing effect of the seal is further increased (see FIG. 5). When the fastening force is set to an intermediate level, the amount of slide up of the seal rings 31 and 32 on the slope becomes an intermediate level (see FIG. 6), and the height of the first seal ring 30a becomes H'. ..

In the case where the bending angle θ° between the first pipe 1 and the second pipe 2 to be repaired is, for example, 4°, the repairing joint 10 is repaired using a crossing angle of 2.5°. When the bend angle θ° between the target first pipe 1 and the second pipe 2 is 5° or less, the repair joint 10 can be repaired by using a crossing angle of 2.5°. If the bending angle θ° between the first pipe 1 and the second pipe 2 is large and θ=7.5°, the repair joint 10 may have a large crossing angle within the range of 5° to 10°. Good. If the upper and lower split housings 11 of the repair joint 10 are connected to each other, the crossing angles of the left and right circular axis cores that form a circular cavity are formed with a preset crossing angle. It suffices to appropriately select the repair joint 10 having a proper intersection angle.

If the allowable value for the bend angle of the conduits on both sides of the leaky joint is 5°, even if the bend angle θ° of the first pipe 1 and the second pipe 2 to be repaired is, for example, 4°, the intersection angle of the repair joint 10 Can be repaired using 5°, and the one with a crossing angle of 5° can handle up to 0° to 10° bend angle θ° of the first pipe 1 and the second pipe 2 to be repaired. It means that. When the upper and lower split housings 11 of the repair joint 10 are connected in this manner, a circular cavity is formed. Then, when the crossing angles of the left and right circular axis cores are formed with a preset crossing angle, and in the case of transport liquid leakage, the repair joint 10 having an appropriate crossing angle may be appropriately selected.

FIG. 7 is a flowchart showing each step of a repair joint repair method S100 according to the present invention. The repair method of the repair joint is a first step S101 of setting a bend angle that determines a bend angle range that falls within a predetermined allowable value out of the bend angles of the conduits on both sides of the leaky joint in advance,
In the split housing 11, the pipeline formed inside the split housing 11 at the time of assembly is a pipeline centerline that extends from the center of one opening end of the pipeline toward the center of the joint, and the center of the other opening from the joint. The intersection angle formed by the center line of the conduit toward the center forms a gap to be a conduit to be formed at the intersection angle within the bending angle range with respect to the intersection angle, and the first seal space 25a and the second seal space 25a are formed. A preparatory step S102 of preparing in advance the split housing 11 having the seal space 25b,
Using the displacement measurement value of the joint to be repaired, including the verification that the bend angle of the conduits on both sides of the joint is equal to or less than the predetermined bend angle;
A first seal ring 30a and a second seal ring, which are seal rings and have elastic body seal rings 31 and 32 each having a groove having a self-increase function for increasing the liquid seal pressure by an internal liquid pressure on a seal contact surface 30B arranged in the first seal space 25a and the second seal space 25b, the latter stage of the assembly step S104,
including.

After preparing each split housing 11 of the repair joint 10, for example, when the outer diameter of the second pipe 2 of the first pipe 1 and the second pipe 2 is larger or smaller than the expected value, The step of adjusting the position of the facing end plate 21b according to the outer diameter of the two pipes 2 is also included. As shown in FIG. 3, the facing end plate 21b of the split housing 11 is detachably provided on a mounting plate 22 provided at the other end of the split sleeve 11A. Therefore, for example, when the outer diameter of the second pipe 2 is larger than the expected value, the facing end plate 21b is removed from the mounting plate 22.

Next, a new opposing end plate 21b suitable for the second pipe 2 having a large outer diameter is attached to the attachment plate 22. As a result, it is not necessary to fabricate the entire repair joint 10 in accordance with the second pipe 2 having a large outer diameter, and a new facing end plate 21b is provided in accordance with the second pipe 2 having a large outer diameter at the repair site. The shape of the repair joint 10 can be adjusted according to the second pipe 2 simply by installing it on the mounting plate 22.

In the above embodiment, an example in which the opposing end plate 21b on the second pipe 2 side of the repair joint 10 is provided so as to be freely attached to the attachment plate 22 is shown, but the present invention is not limited to this, and another attachment to the split sleeve is provided. A plate may be provided, and the end plate 21 on the side of the first pipe 1 may be detachably provided on this mounting plate, similarly to the facing end plate 21b.

In the first step S101 of setting the bending angle that determines the bending angle range within the predetermined allowable value among the bending angles of the pipelines on both sides of the repair joint, in the first step S101, the left-right connection relationship between the first pipe 1 and the second pipe 2, For example, due to the sleeve structure, the pipe diameters of both sides of the leaky joint, the material of the outer circumference, the surface accuracy, the fluid pressure, the leakage amount, and the like, a predetermined allowable value of the bending angle, for example, the allowable value is 2 Set to 0.5°.

In the preparatory step S102 of preparing the divided housings 11 in advance, an estimated number of divided housings 11 in which a predetermined prescribed ratio falls within the range is prepared in advance from the statistical basic numerical value of the leakage pipe determined from the repair applicable area. For example, if it is assumed that 92% of the leaky pipes will be accommodated in a bend angle θ of 0° to 5°, a certain number of repair joints 10 having a crossing angle of 2.5° are prepared. If the bend angle θ° is from 0° to 10° and occupies 98% of the leak pipe and covers them, prepare two types of repair joint 10 of 2.5° cross angle and 7.5°. It is the stage to do. In addition, as described above, when the outer diameter of the second pipe 2 changes, it is not necessary to convert the repair joint 10, and only the new facing end plate 21b is replaced to cope with the change.

In the first stage S103 of the assembling step, it is verified that the bend angles of the conduits on both sides of the repair joint 10 are equal to or less than the predetermined bend angle. For example, if the bend angles of the conduits on both sides of the repair joint 10 are 4°. , A crossing angle of 2.5° is selected, and if the bend angle of the conduits on both sides of the repairing joint 10 is 4°, then 4° is the selected crossing angle of 2.5°. It is verified that the repair joint 10 is within a bend angle range of 0° to 5° within an allowable value ±2.5° with respect to the bend angle.

In the latter stage of the assembly step S104, the wedge-shaped portions of the wedge-shaped seal rings 31 and 32 are housed in the first seal space 25a and the second seal space 25b of the split housing 11 so as to face each other, and the seal holding ring fittings 24a and 24b are housed. The axial bolts 23a and 23b are fitted into the first seal space 25a and the second seal space 25b, and the axial bolts 23a and 23b are fastened with nuts through bolt holes formed in the seal pressing ring fittings 24a and 24b in the circumferential direction. In this case, the seal rings 31 and 32 are compressed by the ring fittings 24a and 24b, the facing wedge portions are slid up, and the upper surface of the groove 34 of the seal ring 31 and the bottom surface of the groove 33 of the seal ring 32 shown in FIG. The side surface of the seal groove 35 in the axial direction of the seal ring 32 forms a hermetic seal.

There is no restriction on the cross-sectional shape of the seal rings 31 and 32 as long as the seal rings 31 and 32 can be easily expanded inward and outward in the radial direction due to the internal sealing pressure and can be applied even when there is a bending displacement of the leak pipe to be repaired. , V shape, or C shape that spreads uniformly.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment shown in FIG. 8, the joint portion of the cylindrical first pipe 1 and the cylindrical second pipe 2 in which the repair joint 10 is installed has no bend, and the axis of the pipe 1 and the pipe 2 The axes of are parallel.

Other configurations in the second embodiment shown in FIG. 8 are substantially the same as those in the first embodiment shown in FIGS. 1 to 7.

In FIG. 8, the same parts as those in the first embodiment shown in FIGS. 1 to 7 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 8, since the joint portion of the first pipe 1 and the second pipe 2 has no bend, the bend angle θ between them is 0°. Moreover, since the crossing angle of the repair joint 10 is also 0°, the angle A between the split sleeve 11A of the upper split housing 11 and the end plate 21a is 90°, and the angle of the lower split housing 11 is 10°. The angle A between the split sleeve 11A and the end plate 21a is also 90°.

Also in the second embodiment shown in FIG. 8, as in the case of the first embodiment shown in FIGS. 1 to 7, for example, when the outer diameter of the second pipe 2 is larger than the expected value, the facing end plate 21b is removed from the mounting plate 22.

Next, a new opposing end plate 21b suitable for the second pipe 2 having a large outer diameter is attached to the attachment plate 22. As a result, it is not necessary to fabricate the repair joint 10 as a whole in accordance with the second pipe 2 having a large outer diameter, and at the repair site, a new opposing end plate 21b is prepared in accordance with the second pipe 2 having a large outer diameter. It is possible to adjust the shape of the repair joint 10 in conformity with the second pipe 2 simply by installing the on the mounting plate 22.

1 1st piping 2 2nd piping 3 Joint surface 10 Repair joint 11 Split housing 13 Bolt 14 Nut 21a End plate 21b Opposing end plate 22 Mounting plate 23a, 23b Bolt 24a, 24b Seal holding ring metal fitting 25a 1st sealing space 25b No. 2 seal space 30a 1st seal ring 30b 2nd seal ring 31 seal ring 32 seal ring 33 groove 34 groove 35 groove 41a 1st connecting plate 41b 2nd connecting plate H Assembled seal ring without load H height "" Assembled seal ring height H'Assembled seal ring height when there is no load and when there is an intermediate load between the above loads θ Bending angle between the first and second pipes α Seal ring wedge angle

Claims (4)

In a repair joint that covers the first pipe and the second pipe from the outer periphery and includes a plurality of split housings,
Each split housing covers the first pipe and the second pipe from the outer circumference and a split sleeve arranged in the axial direction,
An end plate provided at one end of the split sleeve and extending in the radial direction,
A first connecting plate that is provided at the other end of the split sleeve and that has a mounting plate that extends in the radial direction, and that forms a first seal space that accommodates a first seal ring between the end plate and the first pipe. Is provided so as to extend in the axial direction, and the mounting plate is provided with a counter end plate that is detachable and that extends in the radial direction while forming a pair with the end plate. second connecting plate to form a second sealing space for housing the second seal ring is provided to extend in the axial direction, the opposed end plate projects from the mounting plate in a radial direction toward the second pipe side,
The repair joint, wherein the first connecting plate is directly connected to the end plate, and the second connecting plate is attached to the mounting plate via the facing end plate . The repair joint according to claim 1, wherein the axis of the first pipe and the axis of the second pipe are not parallel to each other. The repair joint according to claim 1, wherein the axis of the first pipe and the axis of the second pipe are parallel to each other. The first connecting plate and the second connecting plate have a cylindrical shape, and the first seal ring and the first seal ring in the first seal space are disposed outward in the axial direction of the first connecting plate and the second connecting plate. The repair joint according to any one of claims 1 to 3, wherein seal pressing rings that press the second seal ring in the two seal spaces inward in the axial direction are attached.

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