JP2017048815A - Repairing joint and method for repairing leakage joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reducing a need for customizing a repairing joint for covering a curved portion occurred to a leakage joint according to a curve angle.SOLUTION: An intersection angle is set to fall within a predetermined tolerance value compared to a curve angle of the pipe to be repaired, the intersection angle being formed between right-left pipes as a result of an assembly of a housing of a repairing joint 10. A seal ring receiving part is provided to an inner-diameter side of a divided end surface of each of the housings. When assembling the divided housing, a seal ring holder is formed of the seal ring receiving part and an outer peripheral surface of a repairing pipe facing to the seal ring receiving part. The seal ring holder includes elastic seal rings 31, 32 of a wedge-like cross-section, the seal rings having a seal-pressurizing groove on at least one of a wedge-like slope and a seal abutting surface for increasing a liquid-sealing pressure by a fastening force and an inner sealing liquid pressure in a pipe axial direction. Two seal rings are arranged in the seal ring holder so as to face in the pipe axial direction while abutting against the wedge-like slope.SELECTED DRAWING: Figure 2

Description

  The present invention is a repair joint in the case where there is a bending displacement in a leak joint to be repaired including a leak portion from a pipe through which a liquid flows, and it is possible to produce a customized specification tailored to the pipe axis misalignment of the joint. The present invention relates to a repair joint that can be repaired quickly and economically and a repair method for a leaky joint.

  After embedment of water pipes and industrial pipes, due to aging and ground fluctuations, cracks and wear due to aging, corrosion, impact, etc. of packings and pipes or joints, and deterioration of welds are liquids that circulate through the pipes Cause leakage. A typical conventional method for repairing at the time of occurrence of leakage is to cut out and replace the failed part depending on the case. The part damaged or worn by the replacement is updated and restored to the conventional pipe line. In general, in pipelines where water or industrial liquid materials circulate, when such repairs occur, the circulation must be interrupted, and life in the entire downstream area using the pipeline system or There is an inconvenience that hinders business. In addition, in order to replace the target body, it is necessary to give appropriate treatment to the adjacent parts connected to the body, so the total man-hour is large, especially in buried pipes etc. Requires a remarkably large man-hour.

  By the way, as what improves the response | compatibility method of the leak from piping which distribute | circulates the liquid, what attaches the repair joint which covers the whole repair object joint containing a leak site | part is proposed. This proposal can solve the previous problem (Non-Patent Document 1). When liquid leaks from a joint, it often leaks from the joint due to misalignment of the tube axis of the joint. A so-called double pipe that covers the entire joint to be repaired including the leaked portion is constituted by a repair joint. In this case, assuming that the repair pipe corresponding to the outer pipe of the double pipe is supported by the pipe to be repaired (leakage pipe), if the misalignment exceeds the limit on the pipe axis of the pipe joint to be repaired, the repair pipe will be It becomes impossible to deal with straight pipes. Among the double pipe configurations, for example, a double pipe structure in which a leak pipe is shut off from the outside by an outer pipe that is a repair pipe containing a repair target pipe (leak pipe) has a split structure of Patent Document 1. . This structure is composed of a divided housing and a seal ring accommodated in a receiving portion for accommodating a seal formed at the time of housing assembly, and a holding portion is formed on the inner diameter side of the divided end surface of each housing to divide the seal ring. The protruding seal portion formed at the end portion is received, and the seal ring is configured such that a plurality of string-like ring seal portions can be formed integrally around the outer periphery of the repair portion between both ends of the protruding seal portion. The

  However, even if the seal structure is adopted in such a configuration, if the outer periphery of the repaired part is used as a support standard, the joint part to be repaired has a bending displacement, the connecting pipe shafts are misaligned, and the bending angle When the value exceeds the limit, a gap is generated in the seal portion, and leakage occurs here. Here, it is necessary to design and manufacture the repair pipe along the pipe axis misalignment at the joint connection portion of the pipe to be repaired by taking into account the bending at the joint portion by custom manufacturing of individual specifications. In other words, both the repair method by cutting out paragraph 0002 and the repair method in the previous paragraph, if the joint used in the conventional repair measures the displacement status of the joint to be repaired, and it is designed to match the displacement there is misalignment Is the basic correspondence.

  When there is misalignment in this way, there has also been a proposal for dealing with the misalignment using an uneven packing whose thickness changes along the circumferential direction (Patent Document 2: JP 2012-37041 A). It is also difficult to prepare an uneven packing that fits perfectly. 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 of the pipe axis of the joint, and to make a custom-made repair pipe along the pipe axis misalignment of the leak pipe, and it usually takes 2 months to repair it again. The labor and the economic burden of excavation are generated. As a temporary measure, even though it is possible to take a method of filling the leakage part, it is difficult to prevent the leakage completely and continuously, and in the case of leakage due to aging, corrosion, etc. Leakage points may be expanded, and it is almost impossible to adopt them especially in pipelines that have been fed under considerable high pressure conditions recently, and in any case, they can be repaired again within a short period of time. In the meantime, there is a possibility that the leakage cannot be completely stopped, and there has been a problem of waste of resources.

JP 5-118491 A JP 2012-37041 A

http://www.victaulic.co.jp/products/repair_rs.html, “Repair Fitting, Repair Sleeve RS Model Product Catalog” “Nippon Victric Co., Ltd., Website, July 15, 2015

  In the present invention, even if a pipeline that requires repair is misaligned, a subsequent misalignment occurs, and a leak occurs in the joint portion, There is provided a repair joint and a leak joint repair method that do not need to cut off the distribution and have a sustained repair effect and are economical. According to the present invention, even when the repair object is buried, it is not necessary to perform a test excavation for the purpose of measuring only the displacement state, and an immediate and permanent repair is possible against the leakage of the circulating liquid.

The present invention which solved this problem is as follows.
[Invention of Claim 1]
A split housing used for repairing a leaky joint part,
The crossing angle formed by the assembly of the housing from the center line of one pipe opening toward the center of the joint and the center line of the pipe from the center of the other pipe opening to the center of the joint is a leak. Forming a crossing angle within a range of bends that falls within a predetermined tolerance for the bends of the pipes on both sides of the joint,
Each housing has a seal ring receiving portion on the inner diameter side of the divided end surface,
A split housing in which a seal ring holding portion is formed by the seal ring receiving portion and a leakage pipe outer peripheral surface facing the seal ring receiving portion when the split housing is assembled;
At least one of a wedge slope and a seal contact surface, which is an elastic seal ring having a wedge-shaped cross section in the seal ring holding portion, and self-increasing the liquid seal pressure by the fastening force in the tube axis direction and the internal liquid pressure. A joint for repair, in which a seal ring having a self-intensifying groove is disposed in contact with a wedge slope.

[Effects of the invention]
According to the first aspect of the present invention, when a bending displacement is generated in the joint to be repaired, the joint is enclosed so as to surround the repair joint, and the leakage of the flowing liquid in the pipe and the outflow to the environment are stopped in the housing. Stipulates joints for repairing leaky joints that enable

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

  Among these, the 1st seal part is a fastening plane and the relation where the leak pipe for repair is arranged in the space in a seal is satisfied. When the joint to be repaired is buried and there is a bending displacement, the second axial seal part is evenly spaced in the circumferential direction with the distance between the outer diameter surface of the leakage pipe to be repaired and the inner surface of the housing. If the seal has a cross-sectional shape, for example, the seal cross-sectional distance will be different at the upper end and the lower end, 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, the second seal portion is an elastic seal ring having a wedge-shaped cross-sectional shape and having a groove on the wedge slope, the wedge slope is brought into contact with each other, and the pipe is disposed opposite to the second seal portion. Since it has a self-pressurizing function to increase the liquid seal pressure by the tightening force acting in the axial direction and the internal sealing liquid pressure, the seal pressure is increased by the axial fastening means, and it is opposed at the seal part where the bending angle is large and a large separation occurs. 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 in the case of bending displacement also occurs in parallel when the leakage pipe to be repaired is deformed from a perfect circular cross-section due to the force received from the surroundings, but there are problems due to the same effect. It can be resolved. In addition, the seal ring has a groove on the wedge slope, and if the liquid to be sealed fills the housing and the hydraulic pressure in the housing increases, the inner surface of the groove is increased by the liquid pressure that increases in the groove on the seal surface. Inflating, the sealing pressure of the sealing surface that abuts on the periphery increases, and the sealing ability increases. In other words, even if the seal section is statically deformed from a perfect circular section to a flat shape instead of being circularly symmetric about the center of the tube, if the gap is large due to the flat shape, the seal member at that part will wedge the opposing slope. If the elastic seal ring with a cross-sectional shape slides up and moves in the direction of filling the gap, and if the liquid to be sealed fills the housing and the hydraulic pressure in the housing rises somewhat, the liquid that increases in the groove The pressure causes the inner surface of the groove to swell, the seal pressure of the sealing surface that contacts the surrounding area increases, the sealing performance increases, and the wedge slope groove size is automatically deformed according to the seal pressure so that the pressure is uniform. Even if the housing is not so tight to fasten the housing during installation, that is, it does not require high accuracy, the tolerance of construction management at the site is high, and even if bending displacement occurs, the pipe is somewhat flat Even desired Sealing effect is an effect that properly obtained.

  As a result of 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 is repaired by one excavation without trial digging. If it can be confirmed by displacement measurement that the displacement of the target leak pipe is within the limit of the predetermined bending angle, an effect that permanent repair can be urgently obtained can be obtained.

[Invention of Claim 2]
A bend angle setting stage for determining a bend angle range that falls within a predetermined allowable value among bend angles of pipes on both sides of the leak joint in advance;
In the divided housing, a pipe line formed inside the housing at the time of assembly is a pipe line center line from one open end center of the pipe line toward the joint part center, and from the other open end center to the joint part center. The crossing angle formed by the pipe center line forms a void portion that forms a pipe that should be formed at the crossing angle within the range of the bending angle with respect to the crossing angle, and the divided end face inner diameter side of the housing and the leak pipe outer peripheral surface A preparatory stage for preparing in advance a split housing having a seal ring receiving portion forming a seal ring holding portion;
Using the displacement measurement value of the joint to be repaired, the assembly stage including the verification that the bends of the pipes on both sides of the joint are equal to or less than the predetermined bend, and
An elastic seal ring having a groove on the seal abutting surface having a self-pressure increasing function for increasing the liquid seal pressure by the internal liquid pressure is provided in the seal ring holding portion. After the assembly stage to be arranged,
A method for repairing a leaky joint part, comprising:

[Effects of the invention]
The invention according to claim 2 is provided with a repair joint in which the left and right side plates are bent in advance with respect to the pipe axis in advance, and when the bending displacement is generated in the joint to be repaired, it is prepared in advance. A method for repairing a leaking joint part that quickly attaches the repaired joint so that the liquid flowing in the pipe leaks out and flows out to the environment in the housing can be quickly specified.

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

  Of these, the first seal portion is the fastening plane of the split mating surface, and if the leakage pipe to be repaired is an embodiment of a horizontally arranged pipe, it is a horizontal plane that is split up and down, and the seal joint surface is the inner space exactly at the mating surface Can be sealed. The second axial seal part is a part having the purpose of sealing the annular part of the leak pipe, but if there is a bending displacement when the joint to be repaired is buried, the leak pipe of the repair target 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 section, the seal cross-section distance is eccentric at the upper end and the lower end, resulting in different diameters, or bending displacement. When it is large, there is a tendency that liquid leakage is likely to occur at a seal portion with a large separation. In the present invention, the second seal portion is an elastic seal ring that has a self-pressure-increasing function for increasing the liquid seal pressure by means of the internal sealing liquid pressure, having a groove on the seal contact surface. A ring is arranged in the seal ring holding part with the groove part facing the inner sealing surface. When leakage pressure is applied to the sealed liquid and the sealed liquid leaks to the environment, the groove disposed toward the sealed surface is expanded by the sealed liquid pressure, increasing the pressure of the sealed liquid. Even if a large separation occurs due to the pressure function, the elastic seal ring expands at the C-shaped groove or wedge-shaped lip (groove) part to close the seal gap. This causes the filling effect and improves the liquid sealing performance.

  The same inconvenience as bending displacement also occurs in parallel when the leakage pipe to be repaired is deformed from a perfect circular cross-sectional shape to flat due to the force received from the surroundings. If the internal fluid pressure increases, the fluid pressure that increases in the groove of the seal surface causes the groove inner surface to expand, the seal pressure of the seal surface that abuts in the periphery increases, and the sealing performance increases. That is, the static seal section is not symmetrical about the center of the tube, and even if the gap increases, the grooved cross-section elastic seal ring swells in the groove and the seal pressure of the seal surface that contacts the periphery Increases, the sealing ability increases, and the groove size is automatically deformed according to the sealing pressure so that the groove size becomes uniform pressure. Therefore, even if it is not so nervous when fastening the housing during installation, that is, high accuracy is necessary However, since the tolerance of construction management on site is high, 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.

  Due to the above action, 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, trial digging is not performed. In one excavation, it is possible to confirm that the displacement of the leakage pipe to be repaired is within the limit of a predetermined bending angle by measuring the displacement and complete the repair by emergency repair.

[Invention of Claim 3]
A split housing used in a method for repairing a leaky joint part,
The pipes formed in these housings have an intersection angle formed by a pipe center line from one open end center of the pipe line toward the joint center and a pipe center line from the other open end center to the joint center. Forming a void to be formed at a corner smaller than the bend,
A seal ring receiving portion is provided on the inner diameter side of the divided end surface of each housing,
If the divided housing is assembled, a seal ring holding portion is formed by the seal ring receiving portion and the leakage pipe outer peripheral surface,
In the post-assembly stage,
In the seal ring holding portion, the elastic seal ring is an elastic seal ring having a wedge-shaped cross section, and a wedge slope so as to increase the liquid seal pressure by the fastening force and the internal liquid pressure acting in the tube axis direction. 3. A repair joint for use in the method according to claim 2, wherein two seal rings each having a self-intensifying groove on at least one of the seal contact surfaces are brought into contact with each other with wedge wedges in contact with each other.

[Effects of the invention]
It is the invention of the repair device used in the method according to claim 2, and in the present invention, the second seal portion is an elastic seal ring having a wedge-shaped cross section, and has two seal rings having grooves on the wedge slope. Used with two wedge slopes in contact with each other and provided with a self-pressure increasing function to increase the liquid seal pressure by the squeezing force acting in the tube axis direction and the inner sealing liquid pressure. As the sealing pressure increases, the elastic seal ring with a wedge-shaped cross-section rises on the opposite slope at the seal portion with a large separation, and moves in a direction to fill the gap.

  The same inconvenience is that leakage may occur in parallel in the second seal part even when the leakage pipe to be repaired is deformed from a perfect circular cross section due to the force received from the surroundings. The problem can be solved by the effect. In addition, in one embodiment, the seal ring has a groove on its wedge slope, and if the liquid to be sealed fills the housing and the hydraulic pressure in the housing increases, the hydraulic pressure that increases in the groove on the seal surface As a result, the inner surface of the groove expands, the seal pressure of the seal surface that abuts on the periphery increases, and the sealing ability increases. That is, even if the seal cross section is not statically symmetrical about the tube center, if the gap is large, the wedge-shaped elastic seal ring slides up the opposing slope in the direction perpendicular to the seal surface and fills the gap. If the housing is filled with the liquid to be sealed and the hydraulic pressure in the housing rises, the liquid pressure that increases in the groove causes the groove inner surface to expand, and the seal pressure of the sealing surface that comes into contact with the surroundings increases. Increased, sealing capability increases, and the wedge slope groove automatically deforms according to the sealing pressure so that the pressure is uniform, so even if it is not so nervous when fastening the housing during installation, that is, high accuracy is not required Since the tolerance of construction management at the site is high, there is an effect that a desired sealing effect can be easily obtained even if bending displacement occurs or the tube is flattened to some extent.

[Invention of Claim 4]
The repair joint according to claim 1, wherein the wedge-shaped inclination angle of the cross section of the seal ring is 45 ° or more with respect to the seal contact surface.

[Effects of the invention]
If the wedge-shaped inclination angle of the cross section of the seal ring is 45 ° or more with respect to the seal contact surface, the wedge slope is likely to rise in the direction perpendicular to the seal surface due to the axial fastening force, and the leak pipe to be repaired It is suitable when there is a bending displacement. Compared to a general wedge angle of 30 °, if the angle is 45 ° or more to obtain a sufficient effect of raising the wedge slope, the effect is that the wedge rises vertically from the bottom of the wedge more than the axial displacement. Obtained and preferred.

[Invention of Claim 5]
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.

[Effects of the invention]
Although the wedge angle is generally set to about 30 ° although the wedge effect due to the friction of the contact surface due to the wedge angle is generally set, if it is set to 45 ° or more in order to sufficiently obtain the rising effect of the wedge slope, It is preferable to obtain an effect that it rises vertically from the bottom surface of the wedge more than the displacement in the axial direction. However, the wedge angle of 30% or more, which is a ratio of 50% if not so, is generally 30 degrees. Compared to 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 easily rises in the vertical direction of the seal surface due to the axial fastening force of the leak pipe to be repaired. It is suitable when there is a bending displacement.

[Invention of Claim 6]
The repair joint used in the method according to claim 2, wherein a cross-section of the seal ring has a wedge shape, and a wedge-shaped inclination angle is 45 ° or more with respect to the seal contact surface.

[Effects of the invention]
If the wedge-shaped inclination angle of the cross section of the seal ring is 45 ° or more with respect to the seal contact surface, the wedge slope is likely to rise in the direction perpendicular to the seal surface due to the axial fastening force, and the leak pipe to be repaired It is suitable when there is a bending displacement. Compared to a general wedge angle of 30 °, if the angle is 45 ° or more, the effect of rising from the bottom surface of the wedge is obtained more than the axial displacement if the angle is 45 ° or more. It is preferable.

[Invention of Claim 7]
The joint for repair used by the method of Claim 2 which makes the wedge-shaped inclination | tilt angle of the cross section of the said seal ring 37 degrees or more with respect to a seal contact surface.

[Effects of the invention]
In general, the wedge angle is about 30 ° although the wedge effect is obtained by friction of the contact surface by the wedge angle. In order to obtain a sufficient effect of raising the wedge slope, if it is 45 ° or more, it is preferable to obtain an effect of raising the wedge vertically from the bottom of the wedge more than the axial displacement. Even when the wedge angle is 37 ° or more, the ratio is 30%, a sufficient lift effect 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 easily rises in the vertical direction of the seal surface due to the axial fastening force of the leak pipe to be repaired. It is suitable when there is a bending displacement.

  According to the present invention, there is a repair joint in a case where there is a bending displacement in a joint to be repaired including a leakage portion from a pipe through which a liquid flows, and it is necessary to make an order for individual specifications corresponding to the misalignment of the pipe axis of the joint. A repair method for leaked joints that can be repaired quickly and economically is provided, and even if bending displacement occurs or the pipe is flat to some extent, the tolerance of construction management in the field Therefore, the present invention provides an excellent effect that a repair joint and a repair method for a leaky joint that can easily obtain a desired sealing effect are provided.

It is a front schematic diagram of the repair joint which concerns on one embodiment of this invention. It is a side surface schematic diagram of the repair joint which concerns on one embodiment of this invention. It 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 one embodiment of this invention is not loaded. It 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 one embodiment of this invention is loaded. It 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 one embodiment of this invention is loaded about the middle of FIG. 3 and FIG. It is a side surface schematic diagram of the repair joint which concerns on other embodiment of this invention.

  Hereinafter, a repair joint according to an embodiment of the present invention will be described with reference to FIG. 1 front schematic view and FIG. 2 side schematic view.

FIG. 2 is a schematic side view showing the repair joint 10. The leakage pipe 1 to be repaired extending to the right in FIG. 2 and the leakage pipe 2 to be repaired extending to the left in FIG. 2 are connected by a joint mechanism (not shown) such as a bolt at the joint surface 3. The leakage pipes to be repaired, that is, the leakage pipes 1 and 2 are bent at the 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 with respect to the repair joint on the pipes on both sides of the leak joint is set to 2.5 °, 2.5 ° ± 2.5 ° for a repair tube with a cross angle of 2.5 °, That is, it is possible to cope with the range of the bend angle of the leakage pipe to be repaired of 0 ° to 5 °.

  It is assumed that liquid leakage at this site is found at the joint. In the upper part of FIG. 2, a schematic longitudinal sectional view of the repair joint after repair installation of the repair joint 10 of the present invention is shown. 2 shows a schematic side view of the repair joint 10 as seen from the exterior.

The repair joint 10 of the present invention includes the leakage pipes 1 and 2 to be repaired as outer pipe members so as to wrap the leakage pipes 1 and 2 to be repaired (hereinafter also referred to as leakage pipes 1 and 2). It is connected to the joint part and seals around the joint from the outside. The repair joint 10, which is divided into an upper part 11 and a lower part 12, is connected by bolts and nuts 13 and 14, as depicted in the schematic front view shown in FIG. 1. As shown in FIG. 2, a seal receiving member containing a sealing member made of elastic rubber is 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 portion 20 is provided in an annular groove shape. Seal rings 31 and 32 are accommodated in the seal receiving portion 20, and the seal rings 31 and 32 have wedge-shaped portions, and the wedge portions are disposed opposite to each other and are accommodated in the seal receiving portion 20. When the bolt 23 is fastened with a nut through a plurality of bolt holes in the circumferential direction of the seal holding ring metal fitting 24, the seal rings 31 and 32 are compressed in the axial direction by the ring metal piece 24, and the wedge portions are opposed to each other. 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 °, and a margin of about 30% is generated 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 with each other. In this embodiment, the upper and lower members 11 and 12 are formed with a crossing angle of 2.5 °. If the crossing angle is 0 °, the flange portion of the repair joint is both processed at 90 ° with respect to the left and right axes, but the upper flange upper end inclination angle is the inner angle of the upper and lower members 11 and 12, and the A angle = Formed as 88.75 °, and when both flanges are machined with a tilt distribution of 91.25 ° as the lower flange inclination angle, and the repair joint 10 is assembled, a crossover angle of 2.5 ° is generated in total on the left and right To do.

  As described above, in this embodiment, the repair joint 10 has a crossing angle of 2.5 °, and conforms to the bending angle θ ° of the pipes 1 and 2 to be repaired as long as the elasticity of the seal rings 31 and 32 allows. 31 and 32 facing wedge parts, the outer surfaces of the leakage pipes 1 and 2 to be repaired facing the seal receiving part 20, and the inner hole part of the seal receiving part 20 form a sealing surface, and the leakage pipe 1 to be repaired 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 interior of the repair joint 10 is sealed after repair.

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

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

  In the embodiment, when the bending angle θ ° of the leakage pipes 1 and 2 to be repaired is 4 °, for example, the repair joint 10 is repaired using a crossing angle of 2.5 °. When the bending angle θ ° of 1 and 2 is 5 ° or less, the repair joint 10 can be repaired with a crossing angle of 2.5 °, and the bending angle θ of the leakage 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 a range of 5 ° to 10 ° may be selected. If the upper and lower members 11, 12 of the repair joint 10 are connected, the crossing angle of the left and right circular axes forming a circular cavity is formed with a preset crossing angle. A crossover angle repair joint 10 may be selected as appropriate.

  If the allowable value for the bend angle of the pipes on both sides of the leak joint is 5 °, the cross 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 4 °, for example. It can also be repaired using an object, and those having a crossing angle of 5 ° can cope with those having a bending angle θ ° of 0 to 10 ° between the leakage pipes 1 and 2 to be repaired. When the upper and lower members 11 and 12 of the repair joint 10 are connected in this way, the crossing angle of the left and right circular axis cores forming a circular cavity is formed with a preset crossing angle, and in the case of transportation liquid leakage May be selected appropriately from the repair joint 10 having an appropriate crossing angle.

FIG. 6 is a flowchart showing each stage of the leakage joint repair method S100 according to the present invention. A first step S101 for setting a bend angle that determines a bend angle range that falls within a predetermined tolerance among the bend angles of the pipes on both sides of the leakage joint;
In the divided housing, a pipe line formed inside the housing at the time of assembly is a pipe line center line from one open end center of the pipe line toward the joint part center, and from the other open end center to the joint part center. The crossing angle formed by the pipe center line forms a void portion that becomes a pipe to be formed at a crossing angle within the bending angle range with respect to the crossing angle, and the inner side of the divided end face of the housing and the outside of the repair pipe A preparatory step S102 for preparing in advance a split housing including a seal ring receiving portion that forms a seal ring holding portion on the diameter side;
Using the displacement measurement value of the joint to be repaired, and an assembly stage pre-stage S103 including verification that the bend angles of the pipes on both sides of the joint are equal to or less than the predetermined bend angle;
An elastic seal ring having a groove on the seal abutting surface having a self-pressure increasing function for increasing the liquid seal pressure by the internal liquid pressure is provided in the seal ring holding portion. An assembly stage post-stage S104 to be disposed;
It is repairing method S100 of the leaking joint site | part characterized by including this.

  In the first step S101 for 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, the left and right connection relations of the leak pipe, for example, due to the sleeve structure, leak joint A predetermined allowable value is determined among the bend angles that may vary depending on the pipe diameters of the pipe lines on both sides, the outer peripheral material, the surface accuracy, the hydraulic pressure, the leakage amount, and the like. For example, the allowable value is 2.5 °.

  In a preparation step S102 for preparing a divided housing in advance, an estimated quantity of divided housings in which a predetermined specified ratio falls within the range is prepared in advance from a statistical basic value of the leak pipe determined from the repair target area. For example, if it is assumed that 92% of the leak pipe is within a bending angle θ ° of 0 ° to 5 °, a certain number of repair joints having a crossing angle of 2.5 ° are prepared. If the bending angle θ ° is 0 ° to 10 ° and covers 98% of the leak pipe, prepare two types of repair joints with a crossing angle of 2.5 ° and 7.5 °. It is a stage.

  In the pre-assembly stage S103, it is verified that the bends of the pipes on both sides of the leaking joint are not more than the predetermined bend angle. For example, if the bends of the pipes on both sides of the leaky joint are 4 °, 2.5% If a joint for repair with a crossing angle of ° is selected and the bend angle of the pipe on both sides of the leaking joint is 4 °, this 4 ° is relative to the bend angle of the repair joint with a crossing angle of 2.5 °. It is verified that the angle is within a range of 0 ° to 5 ° within an allowable value ± 2.5 °.

  In the post-assembly stage S104, the wedge-shaped portion of the wedge-shaped seal ring is accommodated facing the seal ring receiving portion of the housing, and the seal pressing ring metal fitting 24 is pivoted through a plurality of bolt holes 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, and the wedge portions facing each other are raised, and the seal ring groove upper surface, the seal ring groove bottom surface, and the axial seal groove surface in the drawing are shown. A hermetic seal is formed on the side.

  While the invention is illustrated in the embodiments described herein, which have been described in detail, the applicant intends to limit and limit the scope of the appended claims in any way. 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 cross-sectional shape of the seal ring is not limited as long as it can be applied to the case where the leakage pipe to be repaired is bent and displaced easily due to the internal sealing pressure, and can be expanded inward and outward in the axial direction. Alternatively, the C shape may be spread evenly. Accordingly, the invention in its broader aspects is not limited to specific details, and each device and example is shown and described. Accordingly, it is possible to depart from these details without departing from the spirit and scope of the applicant's general inventive concept.

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

DESCRIPTION OF SYMBOLS 1 Leak pipe for repair 2 Leak pipe for repair 3 Repair target part of leak joint 10 Repair joint 11 Upper joint for repair 12 Lower joint for repair 13 Joint fitting bolt for repair joint 14 Joint fitting fastening nut for repair 20 Seal acceptance Part 23 Bolt 24 Ring fitting for seal pressing 30 One set of seal ring 31 Seal ring 32 Seal ring 33 Lip on inner diameter side of seal ring (groove)
34 Seal ring outer diameter lip (groove)
35 Wedge slope lip (groove)
L Seal ring assembly shaft length under no load
L '' seal ring assembly shaft length under load
L 'seal ring assembly shaft length when there is no load and intermediate load between the above loads H assembly seal ring height when no load H''assembly seal ring height when loaded H' when no load and above load Assembly seal ring height during loading in the middle state of the upper part A Upper flange upper end inclination angle of the supplementary joint B Lower flange lower end inclination angle of the supplementary joint part θ Leak pipe bending angle to be supplemented α Seal ring wedge angle

Claims (7)

A split housing used for repairing a leaky joint part,
The crossing angle formed by the assembly of the housing from the center line of one pipe opening toward the center of the joint and the center line of the pipe from the center of the other pipe opening to the center of the joint is a leak. Forming a crossing angle within a range of bends that falls within a predetermined tolerance for the bends of the pipes on both sides of the joint,
Each housing has a seal ring receiving portion on the inner diameter side of the divided end surface,
A split housing in which a seal ring holding portion is formed by the seal ring receiving portion and a leakage pipe outer peripheral surface facing the seal ring receiving portion when the split housing is assembled;
At least one of a wedge slope and a seal contact surface, which is an elastic seal ring having a wedge-shaped cross section in the seal ring holding portion, and self-increasing the liquid seal pressure by the fastening force in the tube axis direction and the internal liquid pressure. A joint for repair, in which a seal ring having a self-intensifying groove is disposed in contact with a wedge slope. A bend angle setting stage for determining a bend angle range that falls within a predetermined allowable value among bend angles of pipes on both sides of the leak joint in advance;
In the divided housing, a pipe line formed inside the housing at the time of assembly is a pipe line center line from one open end center of the pipe line toward the joint part center, and from the other open end center to the joint part center. The crossing angle formed by the pipe center line forms a gap portion that becomes a pipe to be formed at the crossing angle within the range of the bending angle with respect to the crossing angle, and the divided end face inner diameter side of the housing and the outer periphery of the leaking pipe A preparatory stage for 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 the verification that the bends of the pipes on both sides of the joint are equal to or less than the predetermined bend, and
An elastic seal ring having a groove on the seal abutting surface having a self-pressure increasing function for increasing the liquid seal pressure by the internal liquid pressure is provided in the seal ring holding portion. After the assembly stage to be arranged,
A method for repairing a leaky joint part, comprising: A split housing used in a method for repairing a leaky joint part,
The pipes formed in these housings have an intersection angle formed by a pipe center line from one open end center of the pipe line toward the joint center and a pipe center line from the other open end center to the joint center. Forming a void to be formed at a corner smaller than the bend,
A seal ring receiving portion is provided on the inner diameter side of the divided end surface of each housing,
If the divided housing is assembled, a seal ring holding portion is formed by the seal ring receiving portion and the leakage pipe outer peripheral surface,
In the post-assembly stage,
In the seal ring holding portion, the elastic seal ring is an elastic seal ring having a wedge-shaped cross section, and a wedge slope so as to increase the liquid seal pressure by the fastening force and the internal liquid pressure acting in the tube axis direction. 3. A repair joint for use in the method according to claim 2, wherein two seal rings each having a self-intensifying groove on at least one of the seal contact surfaces are brought into contact with each other with wedge wedges in contact with each other.   The repair joint according to claim 1, wherein the wedge-shaped inclination angle of the cross section of the seal ring is 45 ° or more with respect to the seal contact surface.   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.   The repair joint used in the method according to claim 2, wherein a cross-section of the seal ring has a wedge shape, and a wedge-shaped inclination angle is 45 ° or more with respect to the seal contact surface.   The joint for repair used by the method of Claim 2 which makes the wedge-shaped inclination | tilt angle of the cross section of the said seal ring 37 degrees or more with respect to a seal contact surface.

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