JP6623472B2 - Repair joint and repair method of leaky joint - Google Patents

Description

  The present invention relates to a repair joint in which a leakage joint to be repaired including a leak site from a pipe through which a liquid flows has a bending displacement, and which is made to order according to individual specifications corresponding to a pipe axis misalignment of the joint. The present invention relates to a repair joint and a method of repairing a leaky joint portion that can be repaired quickly and economically without the need.

  After burying water pipes or industrial pipes, cracks and wear due to aging, corrosion, impact, etc. of packings and pipes or joints due to aging and ground fluctuations, and deterioration of welded parts are caused by liquid flowing through pipes. Cause leakage. In the past, a typical method of repairing when a leak occurs is to cut out and replace a faulty part in some cases, update a damaged or worn part by replacement, and restore it to a conventional pipe line. In general, in such pipelines through which water or industrial liquid materials are distributed, when such repairs occur, the distribution must be cut off, and the life and general life of the downstream area using the pipeline system must be cut off. There are inconveniences that hinder sales. In addition, in order to replace the target body, it is necessary to apply a certain amount of care to the adjacent body connected to the relevant body, so that the total man-hour is large, especially for buried pipes and the like. Requires extremely large man-hours.

  By the way, as a method of improving a method of dealing with leakage from a pipe through which a liquid flows, a method of attaching a repair joint that covers the entire joint to be repaired including a leak site has been proposed. This proposal can solve the above-mentioned problem (Non-Patent Document 1). When liquid leaks from a joint, it often leaks from the joint due to misalignment of the pipe axis of the joint. A so-called double pipe is formed of the repair joint so as to cover the entire repair target joint including the leak site. In this case, if the repair pipe corresponding to the outer pipe of the double pipe is supported by the repair target pipe (leakage pipe), if the misalignment of the pipe axis of the repair target fitting exceeds the limit, the repair pipe will A straight pipe cannot be used. Among the double pipe structures, a double pipe structure in which a leak pipe is shut off from the outside by an outer pipe which is a repair pipe containing a repair target pipe (leak pipe) is known, for example, a split pipe structure disclosed in Patent Document 1. . This structure includes a divided housing and a seal ring accommodated in a receiving portion for accommodating a seal formed at the time of assembling the housing, and forming a holding portion on the inner diameter side of the divided end surface of each housing to divide the seal ring. The projecting seal portion formed at the end portion is received, and the seal ring is configured such that a plurality of string-shaped ring seal portions between both end portions of the projecting seal portion are formed integrally around the repair portion outer periphery. You.

  However, even if a seal structure is adopted in such a configuration, if the outer periphery of the repair portion is used as a support standard, there is a bending displacement at the joint portion to be repaired, and there is a misalignment in both connecting pipe shafts, and the bending angle Is larger than the limit, a gap is generated in the seal portion, and leakage occurs here. Here, it is necessary to design and manufacture a repair pipe along the pipe axis deviation at the joint connection part of the pipe to be repaired by taking into account the bending at the joint part by custom-made by custom specification. In other words, in both the repair method by cutting out paragraph 0002 and the repair method in the previous paragraph, the joint used for the conventional repair is measured after measuring the displacement state of the joint to be repaired, and it is necessary to design according to the displacement with misalignment This is the basic correspondence.

  When there is such a misalignment, a proposal has been made to cope with the misalignment by using an uneven packing whose thickness changes along the circumferential direction (Patent Document 2: Japanese Patent Application Laid-Open No. 2012-37041). It is also difficult to prepare a packing that fits tightly. Then, even in the proposal of Patent Document 1, for example, when the pipe to be repaired is buried in a road like a water pipe, trial digging is performed once and the displacement state is measured. It is necessary to excavate and measure the bending angle on the pipe axis of the joint, and it is necessary to make a custom-made repair pipe along the pipe axis misalignment of the leak pipe. During that period, it usually takes 2 months and repair work is required again Excavation requires labor and economic burden. As a temporary measure, although it is possible to take the method of filling the leaking part with packing material, it is difficult to prevent leakage completely and continuously, and in the case of leakage due to aging, corrosion, etc. Leakage points may be enlarged, and they can hardly be used, especially in pipelines that have recently been supplied under considerable high pressure conditions, and in any case, they can be repaired again within a short period of time. It is necessary, and during that time the leakage may not be completely stopped, and in that case, there is a problem of waste of resources.

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

http://www.victaulic.co.jp/products/repair_rs.html, “Repair fittings, repair sleeve RS type product catalog”, “Nippon Victoria Co., Ltd., website, July 15, 2015.

  The invention of the present application is intended to solve the problem that even if a pipe requiring repair is misaligned, a misalignment occurs afterwards and a leak occurs at a joint portion, the leaked joint portion is quickly circulated in the flowing pipe. The present invention provides a repair joint and a repair method for a leaky joint that do not need to cut off the circulation and have a continuous repair effect and are economical. ADVANTAGE OF THE INVENTION According to this invention, even if a repair target is buried, it is not necessary to perform a test excavation only for the purpose of measuring the displacement state, and it is possible to immediately and permanently repair the leakage of the flowing liquid.

The present invention that solves this problem is as follows.
[Invention according to claim 1]
A split housing used for repairing a leak joint portion,
The intersection angle formed by the pipe center line from the center of one pipe opening end toward the center of the joint part formed by the assembly of the housing and the center line of the pipe line from the center of the other pipe opening end to the center of the joint part is leaky. Forming a crossover angle within a range of bend angles that fall within a predetermined tolerance for the bend angles of the conduits on both sides of the joint,
Each of the housings has a seal ring receiving portion on the inner diameter side of the divided end face,
When assembling the split housing, the split housing includes a split housing in which a seal ring holding portion is formed by the seal ring receiving portion and an outer peripheral surface of the leakage pipe opposed thereto.
In the seal ring holding portion, at least one of a wedge slope and a seal contact surface, which is a wedge-shaped elastic seal ring and self-increases a liquid seal pressure by a fastening force in a pipe axis direction and a sealing liquid pressure. A repair joint characterized in that two seal rings having self-intensifying grooves are arranged facing each other with their wedge slopes in contact with each other.

[Effects of the Invention]
According to the first aspect of the present invention, even when the joint to be repaired is bent and displaced, it is attached so as to surround the repaired joint, and leakage of the flowing liquid in the pipe and outflow to the environment are stopped in the housing. A joint for repairing a leaky joint site that enables the joint is specified.

  The abutting portion between the housing of the repair joint of the present invention and the external environment is divided in the circumferential direction of the leak pipe to be repaired (horizontal direction if the leak pipe to be repaired is a horizontally installed pipe) and fastened with screws or the like. A first seal portion of a housing fastening surface assembled and fastened by means, and a second shaft of an abutting surface between an outer diameter surface of a leakage pipe to be repaired and an inner surface of the housing fastened by fastening means such as a screw in an axial direction. There is a directional seal.

  Of these, the first seal portion is a fastening plane, which satisfies the relationship that the leakage pipe to be repaired is arranged in the space inside the seal. In the second axial seal portion, when the joint to be repaired is buried and there is a bending displacement, the distance between the outer diameter surface of the leakage pipe to be repaired and the inner surface of the housing is eccentric in the circumferential direction, and is uniform. If the seal has a cross-sectional shape, for example, the seal cross-sectional distance at the upper end and the lower end will be eccentrically different, and if the bending displacement is large, liquid leakage should be likely to occur at the seal part with a large separation. However, in the present invention, a wedge-shaped elastic seal ring having a groove on the wedge slope is used for the second seal portion, and the wedge slope is abutted and disposed opposite to the pipe, It has a self-pressure-increasing function that increases the liquid-sealing seal pressure by the tightening force acting in the axial direction and the sealing liquid pressure. You Slope an elastic sealing ring of the wedge cross-sectional shape is ride up, the seal member moves in a direction to fill the gap that occurs in the separation.

  The same inconvenience as the case where there is a bending displacement occurs in parallel when the leak pipe to be repaired is deformed from a perfect circular cross section to a flat shape due to the force received from the surroundings. Can be resolved. In addition, the seal ring has a groove on the wedge slope, and when the liquid to be sealed fills the housing and the liquid pressure in the housing rises, the liquid pressure increases in the groove on the seal surface, so that the groove inner surface is formed. Inflated, the sealing pressure of the sealing surface that comes into contact with the surroundings increases, and the sealing ability increases. In other words, even if the seal cross section is statically deformed from the true circular cross section to the center of the pipe, instead of being circularly symmetric, if the gap is large due to the flatness, the seal member at that location will wedge the opposite slope. If the elastic seal ring of the cross section rises and moves in the direction to fill the gap, and the liquid to be sealed fills the housing and the liquid pressure inside the housing rises somewhat, the liquid that increases in the groove will increase. Due to the pressure, the inner surface of the groove expands, the sealing pressure on the sealing surface that comes into contact with the surroundings increases, the sealing capacity increases, and the wedge slope groove automatically deforms according to the sealing pressure so that the size of the wedge slope groove becomes uniform. However, even when the housing is not so nervous at the time of installation, high accuracy is not required and construction management on the site is highly tolerable, and even if bending displacement occurs, the pipe is somewhat flat. Even desired Sealing effect is an effect that properly obtained.

  With the above operation, even if the bending displacement is unknown before excavation when the joint to be repaired is buried or the flatness of the pipe is unknown, it can be repaired by one excavation without trial digging If it can be confirmed by the displacement measurement that the displacement of the target leak pipe is within the limit of the predetermined bend angle, an effect that urgent and permanent repair is possible is obtained.

[Invention of claim 2]
A bend angle setting step of determining a bend angle range that falls within a predetermined allowable value among the bend angles of the pipelines on both sides of the leak joint in advance,
A divided housing, wherein a pipe formed inside the housing at the time of assembly is a pipe center line extending from the center of one open end of the pipe to the center of the joint, and the center of the pipe is directed from the center of the other open end to the center of the joint. The crossing angle between the pipe center line and the crossing angle forms a gap which is to be formed at a crossing angle within the bending angle range with respect to the crossing angle, and the inner diameter side of the divided end face of the housing and the outer periphery of the leakage pipe are formed. A preparation step of preparing in advance a split housing having a seal ring receiving portion that forms a seal ring holding portion with the surface;
Using the displacement measurement value of the joint to be repaired, the assembly stage including a verification that the bend angle of the pipeline on both sides of the joint is not more than the predetermined bend angle,
In the seal ring holding portion, there is an elastic seal ring having a wedge-shaped cross-section, and at least the wedge slope and the seal contact surface so as to increase the liquid seal pressure by the fastening force and the sealing liquid pressure acting in the pipe axis direction. On the other hand, two seal rings having a self-pressure-intensifying groove, and a later stage of an assembling stage in which the wedge slopes are brought into contact with each other and are arranged to face each other.
A method for repairing a leaky joint portion, characterized in that:

[Effects of the Invention]
In the invention according to claim 2, a repair joint having a bending angle with respect to the pipe axis is prepared in advance on the left and right side plates, and even if a bending displacement occurs in the joint to be repaired, the repair joint is prepared in advance. A method for repairing a leaky joint portion which is installed so as to immediately surround the placed repairing joint so as to quickly stop leakage of the flowing liquid in the pipe and outflow to the environment in the housing is defined.

  The contact portion between the housing and the external environment is divided in the circumferential direction of the repair joint, and is fastened to the first seal portion of the fastening surface to be fastened by the fastening means such as a screw, and is fastened by the fastening means such as a screw in the axial direction. There is a second axial seal between the outer diameter surface of the leak pipe to be repaired and the inner surface of the housing.

  Of these, the first seal portion is a fastening plane of the split mating surface, a horizontal plane which is split up and down if the leakage pipe to be repaired is an embodiment of a horizontally arranged pipe, and the seal joint surface is the inner space exactly at the mating face. Can be sealed. The second axial seal portion is a portion having the purpose of sealing the annular portion of the leak pipe, but if the joint to be repaired is buried and there is a bending displacement, the leak pipe to be repaired is removed. If the distance between the outer diameter surface and the inner surface of the housing is eccentric in the circumferential direction, or if the seal has a uniform circular cross-sectional shape, for example, the seal cross-section distance is eccentric at the upper end and lower end, resulting in different diameters or bending displacement. If it is large, there is a tendency for liquid leakage to occur easily at the seal portion with a large separation. According to the present invention, the second seal portion is an elastic seal ring having a groove on the seal contact surface and having a self-pressure-increasing function of increasing the liquid seal pressure by the sealing liquid pressure. A ring is disposed on the seal ring holding portion with the groove facing the inner sealing surface. If leakage pressure is applied to the sealed liquid and the sealed liquid leaks to the environment, the groove arranged toward the sealed surface is expanded by the sealed liquid pressure, and the self-increasing pressure increases the sealed liquid pressure. Because of the pressure function, even if the sealing pressure increases due to the sealing liquid pressure and a large separation occurs, for example, the elastic seal ring expands at the C-shaped groove or the wedge-shaped lip (groove), and the sealing gap is tightly closed. The liquid sealing performance is improved.

  The same disadvantage as bending displacement occurs in parallel even when the leak pipe to be repaired is deformed from a perfect circular cross section to a flat shape due to the force received from the surroundings, but the liquid to be enclosed fills the housing and the housing When the internal hydraulic pressure increases, the internal pressure of the groove expands due to the increased hydraulic pressure in the groove of the sealing surface, the sealing pressure of the sealing surface abutting around increases, and the situation where the sealing ability increases is the same. That is, even if the seal cross section is not statically symmetrical with respect to the center of the pipe, and even if the gap becomes large, the inner surface of the groove expands at the groove due to the grooved cross section of the elastic seal ring, and the seal pressure of the seal surface that abuts around the groove. Increases, the sealing capacity increases, and the groove size automatically deforms according to the sealing pressure so that the pressure becomes uniform.Therefore, the fastening of the housing during installation does not have to be so nervous, that is, high precision is required However, since there is a high degree of tolerance for construction management on site, there is an effect that a desired sealing effect can be easily obtained even if a bending displacement occurs or the pipe is somewhat flattened.

  According to the method described above, according to the present method, even if the bending displacement is unknown before excavation when the joint to be repaired is buried or the flatness of the pipe is unknown, the test excavation is not performed. With a single excavation, an effect is obtained in which the displacement measurement confirms that the displacement of the leak pipe to be repaired is within the limit of a predetermined bend angle, and the repair is completed by emergency repair.

Also, in the present invention, the second seal portion is provided with two wedge-shaped elastic seal rings each having a groove on a wedge slope, two wedge slopes being abutted, and two opposed wedge slopes being disposed opposite to each other. Since a self-pressure-increasing function is provided to increase the liquid-sealing seal pressure by the squeezing force and the sealing liquid pressure acting in the axial direction of the pipe, the sealing pressure is increased by the axial fastening means, and the seal parts opposed to each other at a large distance are sealed. The elastic seal ring having a wedge-shaped cross section slopes up the slope and moves in a direction to fill the gap.

  A similar disadvantage is that when the leakage pipe to be repaired is deformed from a perfect circular cross section to a flat shape due to the force received from the surroundings, leakage can occur in parallel at the second seal portion, but the same effect is obtained. The problem can be solved by the effect. In addition, in one embodiment, the seal ring has a groove on the wedge slope, and when the liquid to be sealed fills the housing and the liquid pressure in the housing increases, the hydraulic pressure increases in the groove on the seal surface. As a result, the inner surface of the groove expands, and the sealing pressure on the sealing surface that comes into contact with the periphery increases, thereby increasing the sealing ability. In other words, even if the seal cross section is not statically symmetrical with respect to the center of the tube, if the gap is large, the opposing slopes will have a wedge-shaped cross section of elastic seal ring that slides up in the direction perpendicular to the seal face to fill the gap. When the housing is filled with the liquid to be sealed and the liquid pressure in the housing rises, the liquid pressure increases in the groove, the groove inner surface expands, and the sealing pressure of the sealing surface that abuts around the groove increases. The wedge slope groove is automatically deformed so that the wedge slope groove becomes uniform pressure according to the sealing pressure.Therefore, it is not necessary to be so nervous to fasten the housing at the time of installation, that is, high precision is not required. Since there is a high degree of tolerance for construction management on site, there is an effect that a desired sealing effect can be easily obtained even if bending displacement occurs or the pipe is flattened to some extent.

[Invention according to claim 3 ]
The repair joint according to claim 1, wherein a wedge-shaped inclination angle of a cross section of the seal ring is 45 ° or more with respect to a seal contact surface.

[Effects of the Invention]
If the wedge-shaped inclination angle of the cross section of the seal ring is set to 45 ° or more with respect to the seal contact surface, the wedge slope is easily lifted in the vertical direction of the seal surface by the axial fastening force, so that the leakage pipe to be repaired is It is suitable when there is a bending displacement. Compared to the case of a general wedge angle of 30 °, if the angle is set to 45 ° or more in order to sufficiently obtain the effect of raising the wedge slope, the effect of vertically rising from the wedge bottom surface beyond the axial displacement is obtained. Obtained and preferred.

[Invention according to claim 4 ]
2. The repair joint according to claim 1, wherein a wedge-shaped inclination angle of a cross section of the seal ring is 37 ° or more with respect to a seal contact surface. 3.

[Effects of the Invention]
Although the wedge effect due to the friction of the contact surface due to the approximate wedge angle is obtained, the wedge angle is generally set to about 30 °, but if it is set to 45 ° or more in order to sufficiently obtain the effect of raising the wedge slope, Although it is preferable to obtain the effect of vertically rising from the bottom surface of the wedge more than the displacement in the axial direction, it is preferable that the wedge angle is not less than 50% of the wedge angle of 37% or more. In comparison with the case of °, a sufficient lifting effect of 30% or more can be obtained. If the wedge-shaped inclination angle of the cross section of the seal ring is set to 37 ° or more with respect to the seal contact surface, the wedge slope is easily lifted in the vertical direction of the seal surface by the axial fastening force, so that the leakage pipe to be repaired is It is suitable when there is a bending displacement.

[Invention according to claim 5 ]
3. The method according to claim 2, wherein a cross section of the seal ring is wedge-shaped, and a wedge-shaped inclination angle is 45 ° or more with respect to a seal contact surface .

[Effects of the Invention]
If the wedge-shaped inclination angle of the cross section of the seal ring is set to 45 ° or more with respect to the seal contact surface, the wedge slope is easily lifted in the vertical direction of the seal surface by the axial fastening force, so that the leakage pipe to be repaired is It is suitable when there is a bending displacement. In order to obtain a sufficient effect of raising the wedge slope as compared with the case of a general wedge angle of 30 °, if the angle is set to 45 ° or more, the effect of vertically rising from the wedge bottom surface beyond the axial displacement is obtained. And preferred.

[Invention according to claim 6 ]
The method for repairing a leaky joint portion according to claim 2, wherein a wedge-shaped inclination angle of a cross section of the seal ring is 37 ° or more with respect to a seal contact surface .

[Effects of the Invention]
Although a wedge effect due to friction of the contact surface due to the approximate wedge angle is obtained, the wedge angle is generally about 30 °. In order to sufficiently obtain the effect of raising the wedge slope, if the angle is set to 45 ° or more, it is preferable to obtain the effect of vertically rising from the bottom surface of the wedge more than the displacement in the axial direction. Even if the wedge angle is 37 ° or more, which is the ratio, a sufficient lifting effect can be obtained as compared with the case of 30 °. If the wedge-shaped inclination angle of the cross section of the seal ring is set to 37 ° or more with respect to the seal contact surface, the wedge slope is easily lifted in the vertical direction of the seal surface by the axial fastening force, so that the leakage pipe to be repaired is It is suitable when there is a bending displacement.

  According to the present invention, it is a repair joint in a case where a joint to be repaired including a leak site from a pipe through which a liquid flows has a bending displacement, and it is necessary to make an order for individual specifications corresponding to the misalignment of the pipe axis of the joint. Provides a method for repairing leaky joints that can be repaired quickly and economically without the need for tolerances for on-site construction management even if bending displacement occurs or the pipe is somewhat flattened The present invention has an excellent effect of providing a repair joint and a method for repairing a leaky joint, which is high in cost and easily obtains a desired sealing effect.

1 is a schematic front view of a repair joint according to an embodiment of the present invention. It is a side surface schematic diagram of the joint for repair which concerns on one Embodiment of this invention. It is a mimetic diagram showing the case where axial pressure of the seal ring section of the repair joint concerning one embodiment of the present invention is not impressed. It is a mimetic diagram showing the case where axial pressure of a seal ring section of a repair joint concerning one embodiment of the present invention is applied. FIG. 5 is a schematic view showing a case where an axial pressure on a cross section of the seal ring of the repair joint according to the embodiment of the present invention is applied at an intermediate level between FIGS. 3 and 4. FIG. 9 is a schematic side view of a repair joint according to another embodiment of the present invention.

  A repair joint according to an embodiment of the present invention will be described below with reference to the schematic front view of FIG. 1 and the schematic side view of FIG.

FIG. 2 is a schematic side view showing the repair joint 10. The leak pipe 1 to be repaired extending to the right in FIG. 2 and the leak pipe 2 to be repaired extending to the left in FIG. 2 are connected at the joint surface 3 by a joint mechanism such as a bolt (not shown). The leak pipes to be repaired, that is, the leak pipes 1 and 2 are bent at a joint portion for some reason and exhibit a bending angle (see θ ° in FIG. 2).
If the predetermined allowable value for the relative bending angle of the pipes on both sides of the leaky joint with respect to the repair joint is set to 2.5 °, the repair pipe with a crossing angle of 2.5 ° is 2.5 ° ± 2.5 °, That is, it is possible to cope with the range of the bend angle of the leak pipe to be repaired from 0 ° to 5 °.

  It is assumed that a liquid leak at this site is found at the joint. The upper part of FIG. 2 shows a schematic longitudinal sectional view of the repair joint after the repair fitting of the repair joint 10 of the present invention. The lower half 12 of the housing in FIG. 2 is a schematic side view of the repair joint 10 as viewed from the outside.

The repair joint 10 of the present invention includes, as outer tube members, the leak pipes 1 and 2 to be repaired so as to surround the leak pipes 1 and 2 (hereinafter also referred to as leak pipes 1 and 2) to be repaired. It is connected to the joint part and seals around the joint from outside. As illustrated in the schematic front view of FIG. 1, the repair joint 10 is divided into an upper part 11 and a lower part 12 and connected by bolts and nuts 13 and 14. As shown in FIG. 2, seal receiving portions for accommodating a sealing member made of elastic rubber are provided on the surfaces of the upper and lower portions 11 and 12 of the repair joint 10 facing the outer surfaces of the leakage pipes 1 and 2 to be repaired. The part 20 is provided in an annular groove shape. The seal receiving portions 20 accommodate seal rings 31 and 32, respectively. The seal rings 31 and 32 have wedge-shaped portions, and the wedge portions of the seal rings 31 and 32 are opposed to each other and accommodated in the seal receiving portion 20. When the bolt 23 is fastened with a nut through a plurality of bolt holes perforated in the circumferential direction of the seal holding ring 24, the seal rings 31, 32 are axially compressed by the ring fitting 24, and the opposed wedge portions. The seal seal is formed on the upper surface of the seal ring groove, the bottom surface of the seal ring groove, and the side surface of the seal groove surface in the axial direction.
In this case, the wedge angle of the seal ring is formed at 37.5 °, which gives a margin of about 30% as compared with the conventionally used 30 °.

  When the upper and lower members 11 and 12 are connected, the repair joint 10 forms a circular cavity, but the left and right circular axes are crossed and formed. In the present embodiment, the upper and lower members 11 and 12 are formed with a cross angle of 2.5 °. If the crossing angle is 0 °, the flange portion of the repair joint is machined at 90 ° with respect to both the left and right axes. If the repair joint 10 is assembled by forming both flanges at an inclination distribution of 91.25 ° as the lower flange lower end inclination angle, a crossing angle of 2.5 ° will be generated in total for the left and right sides. I do.

  As described above, in this embodiment, the repair joint 10 has a crossing angle of 2.5 °, and is adapted to the bending angle θ ° of the repair target pipes 1 and 2 as far as the elasticity of the seal rings 31 and 32 allows. A sealing surface is formed by the opposed wedge portions 31 and 32, the outer surfaces of the leak pipes 1 and 2 to be repaired facing the seal receiving section 20, and the inner hole of the seal receiving section 20, and the leak pipe 1 to be repaired is formed. The transport liquid leaking from 2 is sealed in the repair joint 10. An air inlet / outlet is provided at the upper end of the repair joint 10, and a drain outlet is provided at the lower end. These are closed at the time of construction, and the inside of the repair joint 10 is sealed after the repair.

  FIG. 3 is a cross-sectional view of the seal part during assembly when no axial pressure is applied to the seal ring. One of the opposed wedge-shaped seal rings is provided with a slope, a groove (lip) on the top and bottom surfaces of the seal, and when a fastening force is applied in the axial direction, it is compressed in the axial direction to expand, Seal the upper and lower sealing surfaces. When a fastening force is applied in the axial direction on the opposite slopes, the wedge-shaped slopes are compressed in the axial direction and move up, further increasing the sealing pressure. This wedge angle is formed at 37.5 °, and the sliding effect is increased as compared with the case where the wedge angle is formed at 30 °, so that the sealing effect of the seal is further increased.

  Although the embodiment according to the present invention has been described above, the present invention is not limited to the embodiment, and can be variously modified and implemented without departing from the gist of the present invention.

  An embodiment in which the repair joint 10 has a crossing angle of 2.5 ° when the bending angle θ ° of the leak pipes 1 and 2 to be repaired is, for example, 4 ° is shown. In the case where the bend angle θ of 1 and 2 is 5 ° or less, the repair joint 10 can be repaired by using a crossing angle of 2.5 °, and the bend angle θ of the leak pipes 1 and 2 to be repaired. If the angle is large and θ = 7.5 °, the repair joint 10 having a large crossing angle within the range of 5 ° to 10 ° may be selected. When the upper and lower members 11 and 12 of the repair joint 10 are connected, a crossing angle between the left and right circular axes forming a circular cavity is formed with a predetermined crossing angle. A repair joint 10 having an appropriate intersection angle may be appropriately selected.

  If the allowable value for the bend angles of the pipes on both sides of the leak joint is 5 °, the intersection angle of the repair joint 10 is 5 ° even when the bend angle θ ° of the leak pipes 1 and 2 to be repaired is, for example, 4 °. It is also possible to perform repair by using a pipe having a crossing angle of 5 °. The leak pipes 1 and 2 to be repaired have a bend angle θ ° of 0 ° to 10 °. When the upper and lower members 11 and 12 of the repair joint 10 are connected in this way, the crossing angle between the left and right circular axes forming a circular cavity is formed with a predetermined crossing angle. In this case, the repair joint 10 having an appropriate intersection angle may be appropriately selected.

FIG. 6 is a flowchart showing each stage of the leaky joint repair method S100 according to the present invention. A first step S101 of previously setting a bend angle that determines a bend angle range that falls within a predetermined allowable value among the bend angles of the pipelines on both sides of the leakage joint;
A divided housing, wherein a pipe formed inside the housing at the time of assembly is a pipe center line extending from the center of one open end of the pipe to the center of the joint, and the center of the pipe is directed from the center of the other open end to the center of the joint. The crossing angle between the pipe center line and the crossing angle forms an air gap that is to be formed at a crossing angle within the bending angle range with respect to the crossing angle, and the inner diameter side of the divided end face of the housing and the outside of the repair pipe are formed. A preparation step S102 of preparing in advance a split housing having a seal ring receiving portion forming a seal ring holding portion with the radial side;
Using the displacement measurement value of the joint to be repaired, the assembly stage pre-stage S103 including a verification that the bend angle of the pipeline on both sides of the joint is equal to or less than the predetermined bend angle,
An elastic seal ring having a groove having a self-pressure-increasing function for increasing a liquid-sealing seal pressure by an enclosing liquid pressure is provided on the seal contact surface. A post-assembly stage S104 to be arranged;
A method S100 for repairing a leaky joint portion, comprising:

  In the first step S101 of setting a bend angle that determines a bend angle range that falls within a predetermined allowable value among the bend angles of the pipes on both sides of the leak joint, a left-right connection relationship of the leak pipe, for example, by a sleeve structure, A predetermined allowable value of the bend angle, which can vary depending on the pipe diameter of the pipes on both sides of the pipe, the material of the outer circumference, the surface accuracy, the hydraulic pressure, the leakage amount, and the like, is determined. For example, the allowable value is 2.5 °.

  In a preparatory step S102 for preparing split housings in advance, an assumed number of split housings in which a predetermined ratio falls within the range is prepared in advance from statistical basic numerical values of leak pipes determined from the repair applicable area. For example, if it is assumed that 92% of the leaked pipe has a bend angle θ of 0 ° to 5 °, a certain number of repair joints having a cross angle of 2.5 ° are prepared. If the bend angle θ ° from 0 ° to 10 ° occupies 98% of the leak pipes and covers them, prepare two kinds of repair joints of 2.5 ° crossing angle and 7.5 ° repair joint. It is a stage.

  In the pre-assembly stage S103, it is verified that the bend angles of the pipes on both sides of the leaky joint are equal to or smaller than the predetermined bend angle. For example, if the bend angles of the pipes on both sides of the leaky joint are 4 °, 2.5 If the bend angle of the pipes on both sides of the leaky joint is 4 °, this 4 ° is the same as the selected bend angle of the 2.5 ° crossover repair joint. Test that the turning angle is in the range of 0 ° to 5 ° within the tolerance ± 2.5 °.

  In the later stage of the assembling step S104, the wedge-shaped seal ring wedge-shaped portion is housed facing the seal ring receiving portion of the housing, and the seal holding ring fitting 24 is axially inserted through a plurality of bolt holes formed in the circumferential direction. When the directional bolt 23 is fastened with a nut, the seal rings 31 and 32 are compressed by the ring fitting 24, the wedge portions facing each other are lifted up, the seal ring groove upper surface, the seal ring groove bottom surface, and the axial seal groove surface in the figure. A hermetic seal is formed on the sides.

  The present invention is depicted in the embodiments described herein, which are described in detail, which applicant intends to limit or limit in any way the appended claims by this description. There is no. Additional advantages and modifications will be apparent to those skilled in the art, and elements described in one embodiment may be employed in other embodiments.

  For example, the seal ring cross section is not limited in cross-sectional shape as long as it can be applied to the case where the leaking pipe to be repaired is easily displaced inward and outward in the axial radius due to the sealing pressure and has a bending displacement. It may be a C-shape that spreads evenly. Therefore, the invention is not limited in its broader details to the specific details, each device and example being shown and described. Accordingly, departures may be made from such details without departing from the spirit and scope of applicant's general inventive concept.

  The present invention relates to a repair joint and a repair method applicable to repair when a joint to be repaired including a leak site from a pipe through which a liquid flows has a bending displacement.

DESCRIPTION OF REFERENCE NUMERALS 1 Leakage pipe to be repaired 2 Leakage pipe to be repaired 3 Repaired part of leaky joint 10 Repair fitting 11 Upper fitting for repair 12 Lower fitting for repair 13 Joint bolt for repair fitting 14 Nut for repair fitting 20 Seal receiving Part 23 Bolt 24 Seal Holder Ring Hardware 30 One Set of Seal Ring 31 Seal Ring 32 Seal Ring 33 Seal Ring Inner Side Lip (Groove)
34 Seal ring outer diameter side lip (groove)
35 Wedge slope lip (groove)
L Seal ring assembly shaft length at no load
L '' Seal ring assembly shaft length under load
L 'Seal ring assembly shaft length at no load and intermediate load between the above loads H Assembled seal ring height at no load H''Assembled seal ring height at load H' No load and above load Seal ring height under load in the intermediate state during load A Apex angle of the upper flange of the upper flange of the training joint B Bend angle of the lower flange of the lower joint of the joint for the retrofit θ Bending angle of the leak pipe to be complemented α Seal wedge angle

Claims (6)

A split housing used for repairing a leak joint portion,
The intersection angle formed by the pipe center line from the center of one pipe opening end toward the center of the joint part formed by the assembly of the housing and the center line of the pipe line from the center of the other pipe opening end to the center of the joint part is leaky. Forming a crossover angle within a range of bend angles that fall within a predetermined tolerance for the bend angles of the conduits on both sides of the joint,
Each of the housings has a seal ring receiving portion on the inner diameter side of the divided end face,
When assembling the split housing, the split housing includes a split housing in which a seal ring holding portion is formed by the seal ring receiving portion and an outer peripheral surface of the leakage pipe opposed thereto.
In the seal ring holding portion, at least one of a wedge slope and a seal contact surface, which is a wedge-shaped elastic seal ring and self-increases a liquid seal pressure by a fastening force in a pipe axis direction and a sealing liquid pressure. A repair joint characterized in that two seal rings having self-intensifying grooves are arranged facing each other with their wedge slopes in contact with each other. A bend angle setting step of determining a bend angle range that falls within a predetermined allowable value among the bend angles of the pipelines on both sides of the leak joint in advance,
A divided housing, wherein a pipe formed inside the housing at the time of assembly is a pipe center line extending from the center of one open end of the pipe to the center of the joint, and the center of the pipe is directed from the center of the other open end to the center of the joint. The crossing angle between the pipe center line and the crossing angle forms a gap which is to be formed at a crossing angle within the bending angle range with respect to the crossing angle, and the inner diameter side of the divided end face of the housing and the outer periphery of the leakage pipe are formed. A preparation step of preparing in advance a split housing having a seal ring receiving portion that forms a seal ring holding portion with the surface;
Using the displacement measurement value of the joint to be repaired, the assembly stage including a verification that the bend angle of the pipeline on both sides of the joint is not more than the predetermined bend angle,
In the seal ring holding portion, there is an elastic seal ring having a wedge-shaped cross-section, and at least the wedge slope and the seal contact surface so as to increase the liquid seal pressure by the fastening force and the sealing liquid pressure acting in the pipe axis direction. On the other hand, two seal rings having a self-pressure-intensifying groove, and a later stage of an assembling stage in which the wedge slopes are brought into contact with each other and are arranged to face each other.
A method for repairing a leaky joint portion, characterized in that:   The repair joint according to claim 1, wherein a wedge-shaped inclination angle of a cross section of the seal ring is 45 ° or more with respect to a seal contact surface.   2. The repair joint according to claim 1, wherein a wedge-shaped inclination angle of a cross section of the seal ring is 37 ° or more with respect to a seal contact surface. 3. 3. The method according to claim 2, wherein a cross section of the seal ring is wedge-shaped, and a wedge-shaped inclination angle is 45 ° or more with respect to a seal contact surface. The method for repairing a leaky joint portion according to claim 2, wherein a wedge-shaped inclination angle of a cross section of the seal ring is 37 ° or more with respect to a seal contact surface.

Images