Sleeve for repairing and reinforcing pipeline defect dense area
By designing the sleeve of the arc -shaped plate stitching, the installation accuracy is used to ensure the installation accuracy, and the welding quality is improved by segmented welding to solve the problem of not accurate and difficult welding in the existing sleeve. Mechanical strength and repair effect.
Patent Information
- Application Number
- CN202421287211.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The existing sleeves are prone to offset and inaccurate during installation, and are difficult to weld, which is prone to welding defects, resulting in unstable welding quality, affecting the overall strength of the sleeve and the repair and strengthening effect of the pipeline.
Design a pipeline defect dense area to repair and strengthen the sleeve. The tube body is spliced by two arc -shaped plates. Set up the tank and the convex plate to ensure the docking accuracy and improve the welding quality by segment welding.
By setting up the connection and convex plates, the installation process is simplified, the docking accuracy and welding quality are improved, the mechanical strength of the sleeve is enhanced, and the pipeline repair and reinforcement effect is ensured.
Smart Images
Figure CN222416621U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of long-distance pipeline repair and reinforcement, and in particular relates to a sleeve for repairing and reinforcing a pipeline defect-intensive area. Background Art
[0002] In the long-term operation of long-distance pipelines, it is inevitable that some defects such as corrosion and breakage will occur. Some defects are often concentrated in the same area, forming a defect-intensive area, which leads to a decrease in pipeline strength and quality, seriously affecting the normal transportation of the pipeline. Therefore, it is necessary to use repair structures such as sleeves to cover the entire pipeline, so as to repair and reinforce the regional dense defects as a whole.
[0003] The sleeve in the prior art is usually formed by connecting multiple circular rings end to end. The sleeve is sleeved on the pipe by connecting the circumferential end faces of adjacent circular rings. Under this structure, the installation process of splicing multiple circular rings in sequence is relatively cumbersome, and it is easy to cause offset and misalignment. It is difficult to ensure the docking accuracy, which affects the connection effect after subsequent welding. At the same time, some pipelines may have undergone relevant repair work when corrosion defects first appear, and their surfaces may have structures left over from previous repairs (such as sleeves, etc.). In this case, it is inconvenient to install the sleeve, and removing the sleeve will destroy the original repair structure of the pipeline to a certain extent, affecting the quality of the pipeline and making the installation of the sleeve more cumbersome. In addition, the circular ring structure is used for connection, and its seam is a continuous circumference. During welding, due to the long path, the welding difficulty is increased, and more welding defects are prone to occur, resulting in unstable welding quality, thereby affecting the overall strength of the sleeve and reducing the repair and reinforcement effect of the pipeline. Utility Model Content
[0004] In view of this, the utility model aims at the problems and shortcomings existing in the prior art and provides a sleeve for repairing and reinforcing a pipeline defect-intensive area.
[0005] A sleeve for repairing and reinforcing a pipeline defect-intensive area comprises a cylinder body, wherein the cylinder body comprises two arc-shaped plates, wherein the arc-shaped plates are provided with bent transition portions near the two ends, wherein a docking groove is provided on one side of the arc-shaped plates, and a convex plate matching the docking groove is provided on the other side, wherein the two arc-shaped plates are spliced through the docking groove and the convex plate, wherein the docking portions of the side edges of the two arc-shaped plates are connected through a first longitudinal weld, wherein the docking portions of the bottom of the docking groove and the convex plate are connected through a second longitudinal weld, wherein the docking portions of the side walls of the docking groove and the convex plate are connected through a circumferential weld, wherein the first longitudinal weld is parallel to the second longitudinal weld, and wherein the two ends of the circumferential weld are respectively connected to the first longitudinal weld and the second longitudinal weld.
[0006] In the above technical scheme, the cylinder is formed by two arc-shaped plates spliced together from top to bottom, and a transition portion is provided at a position near the two ends of the arc-shaped plates. After the two arc-shaped plates are spliced together, the transition portion divides the cylinder into two parts with different inner diameters, and the inner diameter of the middle part is larger than the inner diameters of the two sides; after the two arc-shaped plates are spliced together, the side edges of the two that do not include the docking groove and the convex plate form a first longitudinal weld (in building pipelines, the axial direction of the pipeline is usually stipulated to be longitudinal), and a second longitudinal weld is formed between the bottom edge of the docking groove and the top edge of the convex plate. The two side edges of the docking groove and the two side edges of the convex plate form two circumferential welds, and the two ends of the two circumferential welds are respectively connected to the first longitudinal weld and the second longitudinal weld, so that the overall weld is in the shape of a broken line segment with multiple corners. The two arc-shaped plates are connected together by welding the weld. It should be noted that there can be multiple docking grooves and convex plates on each arc-shaped plate, and they are distributed at intervals on the side edges of the arc-shaped plate.
[0007] Among them, since the defect-intensive areas of some pipelines may have undergone relevant repair work in advance, the pipelines may have structures such as sleeves used for previous repairs. Therefore, a transition part is set to divide the cylinder into two parts with different inner diameters, and the part with a larger inner diameter is set at the sleeve of the pipeline to make a certain concession to avoid excessive pressure on the pipeline. The setting of the transition part enables the sleeve to cope with pipeline repair and reinforcement work in various situations, with a wider range of applications and better practicality. In addition, the transition part is formed by bending, which has a certain curvature, which can make the transition of the cylinder diameter change smoother, avoid the appearance of a right-angled structure, and prevent stress concentration from causing deformation and cracks in the cylinder; secondly, the sleeve in the prior art is usually composed of two circular rings, and the sleeve is sleeved on the pipeline by connecting the circumferential end faces of the two circular rings. Among them, the installation process of multiple circular rings is relatively cumbersome, and it is easy to cause offset and misalignment, and it is difficult to ensure the docking accuracy, which affects the connection effect after subsequent welding. The sleeve of the present application The cylinder body is formed by two arc-shaped plates spliced together from top to bottom. The provided docking grooves and convex plates can effectively ensure the docking accuracy and improve the connection effect. At the same time, the docking grooves and convex plates are used as references for splicing, which makes the installation simpler and faster, and can be installed without affecting the normal operation of the pipeline, without the need to disassemble the pipeline. In addition, a circular ring structure is used for connection, and its joint is a circumference. During welding, the welding difficulty increases due to the long path, and more welding defects are prone to occur, resulting in unstable welding quality and reduced connection performance. The arc plate of the present application, through the provided docking grooves and convex plates, makes the overall shape of the weld a broken line segment with multiple corners, which can realize segmented welding, and the welding process is easier to control, so that the welding quality is effectively improved, the connection effect is enhanced, and the mechanical strength of the sleeve is guaranteed. At the same time, before preparing for welding, when the arc plate is installed on the pipeline, the docking grooves and convex plates can also play a certain limiting role on the two arc plates to prevent the two arc plates from being misaligned during the welding process, thereby ensuring accurate connection.
[0008] Optionally, in a possible implementation, the first longitudinal weld and the second longitudinal weld are both parallel to the axis of the cylinder.
[0009] In the above technical solution, the first longitudinal weld and the second secondary weld are parallel to the axis of the cylinder body, so that the sleeve can be more evenly connected to the pipe.
[0010] Optionally, in a possible implementation, the distance between the first longitudinal weld and the axis of the cylinder is greater than the distance between the second longitudinal weld and the axis of the cylinder.
[0011] In the above technical solution, the distance between the first longitudinal weld and the axis of the cylinder is greater than the distance between the second longitudinal weld and the axis of the cylinder, that is, the depth of the second longitudinal weld is greater than the depth of the first longitudinal weld, and the total length of the second longitudinal weld is greater than the total length of the first longitudinal weld. By setting welds of different depths, a certain buffer is provided to reduce the pressure on the pipeline.
[0012] Optionally, in a possible implementation, the end surfaces where the two arc-shaped plates meet are inclined slopes.
[0013] In the above technical solution, the end faces of the sides of the arc-shaped plates are inclined at a certain angle, so the weld formed also has a certain angle, which is convenient for guiding the solder to flow to the bottom of the weld, ensuring that the weld is full and the welding quality.
[0014] Optionally, in a possible implementation, gaps are provided at the bottoms of the first longitudinal weld and the second longitudinal weld.
[0015] In the above technical solution, a certain gap is left at the bottom of the first longitudinal weld and the second longitudinal weld to avoid direct contact between the two arc-shaped plates and reduce stress concentration.
[0016] Optionally, in a possible implementation manner, the first longitudinal weld and the second longitudinal weld extend from both ends of the circumferential weld.
[0017] In the above technical solution, both ends of the circumferential weld extend a distance beyond the first longitudinal weld and the second longitudinal weld, thereby reducing the sudden change at the intersection of the welds and reducing the possibility of stress concentration.
[0018] Optionally, in a possible implementation, a stop bar groove is opened on the inner side of the cylinder at the position of the second longitudinal weld, and a stop bar is installed in the stop bar groove.
[0019] In the above technical solution, the stop bar groove is located on the inner side of the cylinder. Since the second longitudinal weld is deeper and closer to the pipeline, the stop bar groove is arranged along both sides of the second longitudinal weld. Stop bars are installed in the stop bar groove. The stop bars are used to block the solder to prevent the solder from contacting the pipeline during welding, thereby avoiding affecting the running pipeline.
[0020] Optionally, in a possible implementation manner, the transition portion is in a shape of an arc.
[0021] In the above technical solution, the transition portion adopts an arc shape, which makes the transition smoother and avoids the generation of stress concentration.
[0022] Optionally, in a possible implementation, the cylinder includes a repair area and a fitting area, the repair area and the fitting area are separated by the transition part, and the inner diameter of the repair area is larger than the inner diameter of the fitting area.
[0023] In the above technical solution, the transition part divides the cylinder into a repair area and a fitting area. The fitting area is located at both ends of the cylinder, and the repair area is located between the fitting areas at both ends. The repair area corresponds to the defect-intensive area of the pipeline and is used to repair and reinforce the defect-intensive area of the pipeline. The fitting area is used to fit with the pipeline to ensure that the cylinder is installed firmly. The fitting area matches the outer diameter of the pipeline, and the inner diameter of the repair area is larger than the inner diameter of the fitting area, which is used to make way for some original repair structures of the pipeline (such as sleeves) and reduce the pressure at the defect-intensive area of the pipeline to avoid secondary damage to the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application after pipeline installation.
[0026] Figure 2 It is a cross-sectional schematic diagram of an embodiment of the present application and the pipeline after installation.
[0027] Figure 3 for Figure 2 Enlarged view of position A in the middle.
[0028] Figure 4 This is a schematic diagram of the interface of the second longitudinal weld in this application.
[0029] Figure 5 This is a schematic diagram of the structure of the docking groove and the convex plate before being spliced together.
[0030] Figure 6 This is a schematic diagram of the structure after the docking groove and the convex plate described in this application are spliced together.
[0031] Figure 7 This is a schematic diagram of the connection after welding of the first longitudinal weld (or the second longitudinal weld) in this application.
[0032] Description of reference numerals in the figures:
[0033] 1-cylinder; 11-repair area; 12-fitting area; 13-transition part; 2-arc plate; 21-jointing groove; 22-convex plate; 3-first longitudinal weld; 4-second longitudinal weld; 5-circumferential weld; 6-bar groove; 7-bar; 8-pipeline; 9-sleeve. DETAILED DESCRIPTION
[0034] The following will further describe the sleeve for repairing and reinforcing the densely defective area of the pipeline of the utility model in detail in combination with the specific embodiments and the drawings. The drawings are only for illustrative purposes and represent only schematic diagrams, not actual drawings, and cannot be understood as limiting the patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0035] Please refer to Figures 1 to 7 In a preferred embodiment, a sleeve for repairing and reinforcing a pipeline defect-intensive area is provided, comprising a cylinder 1, wherein the cylinder 1 comprises two arc-shaped plates 2, wherein the arc-shaped plates 2 are provided with bent transition portions 13 near the two ends, wherein a docking groove 21 is provided on one side of the arc-shaped plates 2, and a convex plate 22 matching the docking groove 21 is provided on the other side, wherein the two arc-shaped plates 2 are spliced through the docking groove 21 and the convex plate 22, wherein the docking parts of the sides of the two arc-shaped plates 2 are connected through a first longitudinal weld 3, wherein the docking parts of the bottom of the docking groove 21 and the convex plate 22 are connected through a second longitudinal weld 4, wherein the docking parts of the side walls of the docking groove 21 and the convex plate 22 are connected through a circumferential weld 5, wherein the first longitudinal weld 3 is parallel to the second longitudinal weld 4, and wherein the two ends of the circumferential weld 5 are respectively connected to the first longitudinal weld 3 and the second longitudinal weld 4.
[0036] In this embodiment, the cylinder 1 is formed by splicing two arc-shaped plates 2, and a transition portion 13 is provided at a position near the two ends of the arc-shaped plates 2. After the two arc-shaped plates 2 are spliced, the transition portion 13 divides the cylinder 1 into two parts with different inner diameters, and the inner diameter of the middle part is larger than the inner diameters of the two sides; after the two arc-shaped plates 2 are spliced, the side edges of the two sides excluding the docking groove 21 and the convex plate 22 form a first longitudinal weld 3 (in this embodiment, the axial direction of the pipeline 8 is longitudinal), and a second longitudinal weld 4 is formed between the bottom edge of the docking groove 21 and the top edge of the convex plate 22, and the two side edges of the docking groove 21 and the two side edges of the convex plate 22 form two circumferential welds 5, and the two ends of the two circumferential welds 5 are respectively connected to the first longitudinal weld 3 and the second longitudinal weld 4, so that the weld as a whole is in the shape of a broken line segment with multiple corners, and the two arc-shaped plates 2 are connected together by welding the weld.
[0037] It should be noted that, in some embodiments, a plurality of docking grooves 21 and protruding plates 22 are provided on each arc-shaped plate 2, and the plurality of docking grooves 21 and protruding plates 22 are distributed at intervals along the side of the arc-shaped plate 2. The specific number of the docking grooves 21 and the protruding plates 22 is set according to the length of the sleeve and the requirements of the welding strength.
[0038] In the present embodiment, two arcuate plates 2 are spliced along a direction perpendicular to the axis of the pipe 8 to form a cylinder 1, while the sleeve in the prior art is usually composed of two circular rings, and the sleeve is sleeved on the pipe 8 by connecting the circumferential end faces of the two circular rings. Among them, the installation process of splicing multiple circular rings is relatively cumbersome, and it is easy to cause offset and misalignment, and it is difficult to ensure the docking accuracy, which affects the connection effect after subsequent welding. The cylinder 1 of the sleeve of the present application is formed by two arcuate plates 2 spliced up and down, and the provided docking grooves 21 and convex plates 22 can effectively ensure the docking accuracy and improve the connection effect. At the same time, the docking grooves 21 and convex plates 22 are used as references for splicing, and the installation is simpler and faster, and it can be installed without affecting the normal operation of the pipe 8, without the need for pipe 8 for disassembly; in addition, a circular ring structure is used for connection, and its joint is a circle. During welding, due to the long path, the welding difficulty is increased, and more welding defects are prone to occur, resulting in unstable welding quality and reduced connection performance. The arc plate 2 of the present application is provided with a docking groove 21 and a convex plate 22, so that the overall shape of the weld is a broken line segment with multiple corners, which can realize segmented welding, and the welding process is easier to control, so that the welding quality is effectively improved, the connection effect is enhanced, and the mechanical strength of the sleeve is guaranteed. At the same time, before preparing for welding, when the arc plate 2 is installed on the pipe 8, the docking groove 21 and the convex plate 22 can also play a certain limiting role on the two arc plates 2, preventing the two arc plates 2 from being misaligned during the welding process, and ensuring accurate connection.
[0039] Please continue to refer to Figure 1 In this embodiment, the pipeline 8 has been repaired in advance in the defect-intensive area, that is, a sleeve 9 for repair is retained on the pipeline 8. Figure 1 As shown, specifically, the sleeve 9 on the pipe 8 has only a range of 180°.
[0040] In this embodiment, both arc-shaped plates 2 are provided with bent transition portions 13, which divide the cylinder 1 into a repair area 11 and a fitting area 12. The fitting area 12 is located at the two end positions of the cylinder 1, and the repair area 11 is located between the two fitting areas 12. The repair area 11 corresponds to the defect-intensive area of the pipeline 8 and is used to repair and reinforce the defect-intensive area of the pipeline 8. The fitting area 12 is used to fit with the pipeline 8 to ensure that the cylinder 1 is firmly installed, wherein the fitting area 12 matches the outer diameter of the pipeline 8, and the inner diameter of the repair area 11 is larger than the inner diameter of the fitting area 12, which is used to make way for the original sleeve 9 of the pipeline 8, while reducing the pressure at the defect-intensive area of the pipeline 8 to avoid secondary damage to the pipeline 8.
[0041] The present application divides the cylinder 1 into two parts with different inner diameters by setting a transition part 13. The inner diameter of the repair area 11 is larger, and it is correspondingly set at the original sleeve 9 position of the pipeline 8, which can make a certain concession to avoid excessive pressure on the pipeline 8. The fitting areas 12 on both sides of the repair area 11 are matched with the outer diameter of the pipeline 8 to ensure that the cylinder 1 and the pipeline 8 are firmly connected. The setting of the transition part 13 enables the sleeve to cope with pipeline 8 repair and reinforcement work in various situations, with a wider range of applications and better practicality. In addition, the transition part 13 is formed by bending, which has a certain curvature, which can make the diameter change transition of the cylinder 1 smoother, avoid the appearance of a right-angled structure, and prevent stress concentration from causing deformation and cracks in the cylinder 1.
[0042] Please refer to Figures 2 to 3 In a non-limiting embodiment of the present application, the first longitudinal weld 3 and the second longitudinal weld 4 are both parallel to the axis of the cylinder 1, and the distance between the first longitudinal weld 3 and the axis of the cylinder 1 is greater than the distance between the second longitudinal weld 4 and the axis of the cylinder 1.
[0043] In this embodiment, the first longitudinal weld 3 and the second longitudinal weld are parallel to the axis of the cylinder 1, so that the sleeve can be more evenly sleeved on the pipe 8. The distance between the first longitudinal weld 3 and the axis of the cylinder 1 is greater than the distance between the second longitudinal weld 4 and the axis of the cylinder 1, that is, the depth of the second longitudinal weld 4 is greater than the depth of the first longitudinal weld 3. By setting welds of different depths, a certain buffer is provided to reduce the pressure on the pipe 8. Since the total length of the second longitudinal weld 4 is greater than the total length of the first longitudinal weld 3, the second longitudinal weld 4 is set closer to the pipe 8 to ensure that the sleeve is firmly installed.
[0044] Please refer to Figure 6 and Figure 7 In a non-limiting embodiment of the present application, the end surfaces of the two arc-shaped plates 2 that are connected to each other are inclined slopes.
[0045] In this embodiment, the end faces of the sides of the arc plates 2 are inclined at a certain angle, so the weld formed also has a certain angle, which is convenient for guiding the solder to flow to the bottom of the weld, ensuring that the weld is full and the welding quality. In this embodiment, preferably, the angle between the first longitudinal weld 3 and the second longitudinal weld 4 is 40°.
[0046] It should be noted that the circumferential weld 5 has a similar structure to the first longitudinal weld 3 and the second longitudinal weld 4 , and also has a certain angle (not specifically shown in the figure).
[0047] Please refer to Figure 6 and Figure 7 In a non-limiting embodiment of the present application, gaps are provided at the bottoms of the first longitudinal weld 3 and the second longitudinal weld 4 .
[0048] In this embodiment, a certain gap is left at the bottom of the first longitudinal weld 3 and the second longitudinal weld 4 to avoid direct contact between the bottoms of the two arc-shaped plates 2 when they are spliced, thereby alleviating stress concentration and ensuring the connection effect.
[0049] Please refer to Figure 4 and Figure 5 In a non-limiting embodiment of the present application, the first longitudinal weld 3 and the second longitudinal weld 4 extend from both ends of the circumferential weld 5 .
[0050] In this embodiment, both ends of the circumferential weld 5 extend a distance beyond the first longitudinal weld 3 and the second longitudinal weld 4, thereby reducing the sudden change at the intersection of the welds and the possibility of stress concentration.
[0051] Please refer to Figure 3 and Figure 6 In a non-limiting embodiment of the present application, a stop bar groove 6 is formed on the inner side of the cylinder 1 at the position of the second longitudinal weld 4 , and a stop bar 7 is installed in the stop bar groove 6 .
[0052] In this embodiment, the stop bar groove 6 is located on the inner side of the cylinder 1. Since the second longitudinal weld 4 is deeper and closer to the pipe 8, the stop bar groove 6 is arranged along the position of the second longitudinal weld 4. A stop bar 7 is installed in the stop bar groove 6. The stop bar 7 is used to block the solder to prevent the solder from contacting the pipe 8 during welding, thereby avoiding affecting the running pipe 8.
[0053] Please refer to Figure 1 In a non-limiting embodiment of the present application, the transition portion 13 is in the shape of an arc.
[0054] In this embodiment, the transition portion 13 is in an arc shape, which can make the transition of the cylinder 1 smoother and avoid the generation of stress concentration.
[0055] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0057] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0058] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.
Claims
1. A sleeve for repairing and reinforcing a pipeline defect-intensive area, comprising a cylinder body, characterized in that: The cylinder body includes two arc-shaped plates, and a bent transition portion is provided at a position near the two ends of the arc-shaped plate. A docking groove is provided on one side of the arc-shaped plate, and a convex plate matching the docking groove is provided on the other side. The two arc-shaped plates are spliced through the docking groove and the convex plate. The docking part of the side edges of the two arc-shaped plates is connected by a first longitudinal weld, the docking part of the bottom of the docking groove and the convex plate is connected by a second longitudinal weld, and the docking part of the side wall of the docking groove and the convex plate is connected by a circumferential weld. The first longitudinal weld is parallel to the second longitudinal weld, and the two ends of the circumferential weld are respectively connected to the first longitudinal weld and the second longitudinal weld.
2. The sleeve for repairing and reinforcing a pipeline defect-intensive area according to claim 1 is characterized in that: The first longitudinal weld and the second longitudinal weld are both parallel to the axis of the cylinder.
3. The sleeve for repairing and reinforcing a pipeline defect-intensive area according to claim 2 is characterized in that: The distance between the first longitudinal weld and the axis of the cylinder is greater than the distance between the second longitudinal weld and the axis of the cylinder.
4. The sleeve for repairing and reinforcing a pipeline defect-intensive area according to claim 1 is characterized in that: The end surfaces where the two arc-shaped plates meet are inclined slopes.
5. The sleeve for repairing and reinforcing a pipeline defect-intensive area according to claim 4 is characterized in that: Gaps are provided at the bottoms of the first longitudinal weld and the second longitudinal weld.
6. The sleeve for repairing and reinforcing a pipeline defect-intensive area according to claim 1 is characterized in that: The first longitudinal weld and the second longitudinal weld extend from both ends of the circumferential weld.
7. The sleeve for repairing and reinforcing a pipeline defect-intensive area according to claim 1 is characterized in that: A bar groove is formed inside the cylinder at the position of the second longitudinal weld, and a bar is installed in the bar groove.
8. The sleeve for repairing and reinforcing a pipeline defect-intensive area according to claim 1 is characterized in that: The transition portion is in the shape of an arc.
9. The sleeve for repairing and reinforcing a pipeline defect-intensive area according to claim 8, characterized in that: The cylinder comprises a repair area and a fitting area, wherein the repair area and the fitting area are separated by the transition part, and the inner diameter of the repair area is greater than the inner diameter of the fitting area.