Composite material clamp for pipeline repair and preparation method thereof

Abstract

The application relates to a composite clamp for pipeline repair and a manufacturing method thereof, and comprises the following steps: preparing an upper shell and a lower shell by using carbon fiber composite material, providing an upper flange on both sides of the upper shell, providing a lower flange on both sides of the lower shell, and surrounding the upper shell and the lower shell with a containing cavity; providing a first recess on the front end and the rear end of the upper shell, providing a first flange recess on the upper flange, providing a second recess on the front end and the rear end of the lower shell, providing a second flange recess on the lower flange, and bonding a round corner sealing rubber strip in a third recess formed at the connecting position of the upper shell and the lower shell; bonding an upper shell sealing rubber strip in the first recess and the first flange recess, bonding a lower shell sealing rubber strip in the second recess and the second flange recess, and fixing the upper shell and the lower shell through bolts to obtain the composite clamp for pipeline repair. The preparation of the composite clamp for pipeline repair effectively solves the problems of heavy weight of the pipeline repair tool, inconvenience in construction and complexity in the construction process in the prior art.

Description

Technical Field

[0001] This invention relates to the field of emergency repair and maintenance of oil and gas pipelines, and in particular to a composite material clamp for pipeline emergency repair and its preparation method. Background Technology

[0002] Currently, steel sleeves and clamps are commonly used as key tools for emergency repairs of oil and gas pipelines. However, during on-site construction, two problems were found with these repair methods:

[0003] First, existing repair tools are too heavy, making construction inconvenient. For pipeline maintenance and emergency repairs, the patch plates and sleeves used in oil and gas pipeline repair designs are generally designed for full pressure bearing. However, the materials for these plates and sleeves are primarily low-grade steels such as Q345R and X52. These low-grade steels have low strength, requiring sleeves with thicker walls to meet the same strength requirements, resulting in very heavy patch plates and sleeves. With the development of pipeline integrity, pipeline maintenance and emergency repairs are showing trends of higher pipeline steel grades, more maintenance and emergency repairs, shorter maintenance and emergency repair times, and increased complexity of ground environments. Existing repair tools require large-tonnage cranes, forklifts, and a large amount of manpower for operation, leading to low efficiency and high costs, and are no longer sufficient to meet the needs of current maintenance and emergency repair work.

[0004] Secondly, the existing repair tools involve complex construction processes and make it difficult to control the quality of construction. Due to the excessive size and weight of steel sleeves and clamps, precise control during construction is difficult, which can easily cause the edges of the sleeves or sharp parts of the flanges to collide with the pipe body, creating new defects. In addition, after the defective pipeline is repaired with steel sleeves and backfilled, the excessive weight of the repaired area can easily lead to local settlement and stress concentration, causing secondary damage.

[0005] Therefore, in order to address the above problems, the present invention urgently needs to provide a composite material clamp for pipeline emergency repair and its manufacturing method, so as to better achieve the goal of rapid treatment and rapid repair of ruptured pipelines. Summary of the Invention

[0006] The purpose of this invention is to provide a composite material clamp for pipeline emergency repair and its preparation method. By proposing a composite material clamp for pipeline emergency repair and its preparation method, this invention aims to solve the technical problems in the prior art where pipeline repair tools are heavy, inconvenient to construct, and have complex construction processes and difficult-to-control construction quality.

[0007] This invention provides a method for preparing a composite material clamp for pipeline emergency repair, comprising the following steps:

[0008] The upper and lower shells are made of carbon fiber composite material. The upper shell has outwardly extending upper flange edges on opposite sides, and upper flange holes are arranged at intervals along the length of each upper flange edge. The lower shell has lower flange edges on both sides corresponding to the upper flange edges, and lower flange holes are arranged at intervals along the length of each lower flange edge. The upper and lower shells surround a receiving cavity, and the diameter of the middle part of the receiving cavity is larger than the diameter of its two ends.

[0009] At least one first groove is formed at the front and rear ends of the upper shell, and a first flange groove is formed on the upper flange edge on both sides of the upper shell, which communicates with the first groove. At least one second groove is formed at the front and rear ends of the lower shell, and the first groove and the second groove are staggered vertically. A second flange groove is formed on the lower flange edge on both sides, which communicates with the second groove. The second flange groove is staggered with the first flange groove.

[0010] The connection between the upper housing and the upper flange is rounded, and the connection between the lower housing and the lower flange is rounded, so that a third groove is formed on the inner wall of the connection between the upper housing and the lower housing. Rounded corner sealing strips are glued into the third grooves on the left and right sides.

[0011] The upper housing sealing strip is bonded to the first groove and the first flange groove, and the lower housing sealing strip is bonded to the second groove and the second flange groove. The upper housing sealing strip and the lower housing sealing strip are misaligned and fitted together.

[0012] The upper and lower housings are fastened together and secured with bolts to obtain a composite material clamp for pipeline emergency repair.

[0013] Preferably, the upper thickened flanges on both sides of the upper shell are made of carbon fiber composite material. The inner surface shape of the upper thickened flange follows the shape of the outer wall of the upper shell, and the outer surface shape follows the shape of the upper flange edge. Upper thickened flange holes, corresponding to the upper flange holes, are opened at intervals along the upper edge of the upper thickened flange. The lower thickened flanges on both sides of the lower shell are made of carbon fiber composite material and prepared by vacuum infusion process. The inner surface shape of the lower thickened flange follows the shape of the outer wall of the lower shell, and the outer surface shape follows the shape of the lower flange edge. Lower thickened flange holes, corresponding to the lower flange holes, are opened at intervals along the upper edge of the lower thickened flange.

[0014] Preferably, the rounded corner sealing strip has a triangular cross-section, and the two sides of the rounded corner sealing strip are arc-shaped grooves. Each arc-shaped groove is provided with an upper embedding groove for embedding the upper housing sealing strip and a lower embedding groove for embedding the lower housing sealing strip.

[0015] Preferably, the upper and lower shells are prepared using a vacuum infusion process.

[0016] Preferably, the upper housing sealing strip, the lower housing sealing strip, and the rounded corner sealing strip are made of hard rubber.

[0017] Preferably, the upper and lower thickened flanges are manufactured using a vacuum injection process.

[0018] Preferably, the thickness of the upper thickened flange is 110-150mm; the thickness of the lower thickened flange is 110-150mm; the length of the upper shell is 750-1000mm; the length of the lower shell is 750-1000mm; the wall thickness of the upper shell is 30-50mm; and the wall thickness of the lower shell is 30-50mm.

[0019] Preferably, the thickness of the upper flange edge is 30-50mm, and the thickness of the lower flange edge is 30-50mm.

[0020] The present invention provides a composite material clamp obtained by the preparation method of the composite material clamp for pipeline emergency repair as described in any one of claims 1-8 above, comprising an upper shell and a lower shell, wherein the upper shell has outwardly extending upper flange edges on opposite sides, and each upper flange edge is provided with upper flange holes at intervals along its length; the lower shell has lower flange edges on both sides corresponding to the upper flange edges, and each lower flange edge is provided with lower flange holes at intervals along its length; the upper shell and the lower shell surround a receiving cavity.

[0021] At least one first groove is provided at the front end and rear end of the upper shell, and a first flange groove communicating with the first groove is provided on the upper flange edge on both sides. At least one second groove corresponding to the first groove is provided at the front end and rear end of the lower shell, and a second flange groove communicating with the second groove is provided on the lower flange edge on both sides. The second flange groove is misaligned with the first flange groove.

[0022] A third groove is formed on the inner wall at the connection between the upper and lower shells;

[0023] The upper housing sealing strip is bonded to the first groove and the first flange groove; a rounded corner sealing strip is bonded to the third groove on the left; the lower housing sealing strip is bonded to the second groove and the second flange groove; and a rounded corner sealing strip is bonded to the third groove on the right. The upper housing sealing strip and the lower housing sealing strip are staggered and fitted together; the upper housing and the lower housing are connected as one unit by bolts.

[0024] Preferably, it also includes upper thickened flanges on both sides of the upper housing, the inner side of the upper thickened flange being thickened in accordance with the outer wall of the upper housing, the outer side of the upper thickened flange being thickened in accordance with the edge of the upper flange, and upper thickened flange holes corresponding to the upper flange holes are opened at intervals along the upper edge of the upper thickened flange; and lower thickened flanges on both sides of the lower housing, the inner side of the lower thickened flange being thickened in accordance with the outer wall of the lower housing, the outer side of the lower thickened flange being thickened in accordance with the edge of the lower flange, and lower thickened flange holes corresponding to the lower flange holes are opened at intervals along the upper edge of the lower thickened flange.

[0025] The composite material clamp for pipeline emergency repair and its preparation method provided by this invention have the following advantages compared with the prior art:

[0026] 1. The method for preparing composite material clamps for pipeline emergency repair provided by the present invention uses composite material vacuum injection process to prepare upper shell and lower shell. The upper shell and lower shell can be integrally injection molded or staged injection molded. The upper shell has outwardly extending upper flange edges on opposite sides, and upper flange holes are arranged at intervals along the length of each upper flange edge. The lower shell has lower flange edges on both sides corresponding to the upper flange edges, and lower flange holes are arranged at intervals along the length of each lower flange edge. The upper shell and lower shell surround a receiving cavity.

[0027] At least one first groove is formed at the front and rear ends of the upper shell, and a first flange groove is formed on the upper flange edge on both sides of the upper shell, which communicates with the first groove. At least one second groove is formed at the front and rear ends of the lower shell, and the first groove and the second groove are staggered vertically. A second flange groove is formed on the lower flange edge on both sides, which communicates with the second groove. The second flange groove is staggered with the first flange groove.

[0028] The connection between the upper housing and the upper flange is rounded, and the connection between the lower housing and the lower flange is rounded, so that a third groove is formed on the inner wall of the connection between the upper housing and the lower housing. Rounded corner sealing strips are glued into the third grooves on the left and right sides.

[0029] The upper housing sealing strip is bonded to the first groove and the first flange groove, and the lower housing sealing strip is bonded to the second groove and the second flange groove. The upper housing sealing strip and the lower housing sealing strip are misaligned and fitted together.

[0030] The upper and lower shells are fastened together, and bolts are passed through the upper thickened flange hole, the upper flange hole, the lower flange hole and the lower thickened flange hole in sequence to connect and fix them, thus obtaining a composite material clamp for pipeline emergency repair;

[0031] The composite material clamp for pipeline emergency repair obtained through the above steps features a variable diameter design that differs from existing clamps with constant diameters. This design adapts to pipes of various sizes and models, and can also meet the emergency repair requirements of oil and gas pipelines with leakage exceeding 30% deformation, thus expanding its applicability. Simultaneously, the second flange groove of the composite material clamp is offset from the first flange groove, facilitating the secure adhesion of the upper and lower housing sealing strips to the upper and lower housings respectively, forming a staggered seal through vertical compression. A third groove is formed at the connection point of the upper and lower housings, with rounded corner sealing strips adhered to the left and right sides. These rounded corner sealing strips work in conjunction with the upper and lower housing sealing strips to achieve optimal sealing when the upper and lower housings are engaged. Furthermore, the rounded corner sealing strips perfectly match the rounded corner design of the corners in composite material processing, effectively solving the problem of ineffective sealing at composite material corners when rounded corners are used.

[0032] 2. The composite material clamp for pipeline emergency repair provided by this invention uses carbon fiber composite material to make the upper and lower shells. Unlike existing pipeline clamps made of metal and epoxy-based high compressive strength filler materials, the application of carbon fiber composite material can significantly reduce the self-weight of the pipeline repair clamp, effectively solving the problem of the large weight and inconvenience of construction of existing repair tools. The high strength and high rigidity of carbon fiber composite material can improve the structural safety of the pipeline repair while also giving the pipeline clamp excellent corrosion resistance and fatigue resistance. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram (front view) of the composite material clamp for pipeline emergency repair according to the present invention;

[0035] Figure 2 This is a schematic diagram of the thickened flange of the composite material clamp for pipeline emergency repair according to the present invention;

[0036] Figure 3 This is a schematic diagram of the lower thickened flange of the composite material clamp for pipeline emergency repair according to the present invention;

[0037] Figure 4 This is a schematic diagram of the housing of the composite material clamp for pipeline emergency repair according to the present invention;

[0038] Figure 5 This is a schematic diagram of the sealing design method for the composite material clamp used in pipeline emergency repair according to the present invention;

[0039] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0040] Figure 7 This is a schematic diagram (sectional view) of the misaligned bonding of the sealing strip of the composite material clamp for pipeline emergency repair according to the present invention;

[0041] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0042] Figure 9 This is a schematic diagram of the rounded corner sealing strip of the composite material clamp for pipeline emergency repair according to the present invention;

[0043] Figure 10 This is a schematic diagram of the sealing ring groove on the upper shell of the composite material clamp for pipeline emergency repair according to the present invention;

[0044] Figure 11 This is a schematic diagram of the sealing ring groove in the lower shell of the composite material clamp for pipeline emergency repair according to the present invention;

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Upper housing; 2. Lower housing; 3. Upper flange edge; 4. Upper flange hole; 5. Lower flange edge; 6. Lower flange hole; 7. Receiving cavity; 8. Upper thickened flange; 9. Upper thickened flange hole; 10. Lower thickened flange; 11. Lower thickened flange hole; 12. First groove; 13. First flange groove; 14. Second groove; 15. Second flange groove; 16. Third groove; 17. Upper housing sealing strip; 18. Lower housing sealing strip; 19. Rounded corner sealing strip; 20. Upper embedded groove; 21. Bolt. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] like Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown, this embodiment provides a method for preparing a composite material clamp for pipeline emergency repair, including the following steps:

[0051] (1) The upper shell 1 and the lower shell 2 are prepared by vacuum injection process of composite materials. The upper shell 1 and the lower shell 2 can be integrally injection molded or in stages. The upper shell 1 has outwardly extending upper flange edges 3 on opposite sides. Each upper flange edge 3 is provided with upper flange holes 4 at intervals along its length. The lower shell 2 has lower flange edges 5 on both sides corresponding to the upper flange edges 3. Each lower flange edge 5 is provided with lower flange holes 6 at intervals along its length. The upper shell 1 and the lower shell 2 surround a receiving cavity 7. The diameter of the middle part of the receiving cavity 7 is larger than the diameter of its two ends.

[0052] (2) At least one first groove 12 is opened at the front end and the rear end of the upper shell 1, and a first flange groove 13 is opened on the upper flange edge 3 on both sides of the upper shell 1, which communicates with the first groove 12. At least one second groove 14 is opened at the front end and the rear end of the lower shell 2. The first groove 12 and the second groove 14 are staggered vertically. A second flange groove 15 is opened on the lower flange edge 5 on both sides, which communicates with the second groove 14. The second flange groove 15 is staggered with the first flange groove 13.

[0053] (3) The connection between the upper shell 1 and the upper flange edge 3 is rounded, and the connection between the lower shell 2 and the lower flange edge 5 is rounded, so that a third groove 16 is formed on the inner wall of the connection between the upper shell 1 and the lower shell 2, and rounded corner sealing strips 19 are glued in the third grooves 16 on the left and right sides.

[0054] (4) The upper housing sealing strip 17 is bonded to the first groove 12 and the first flange groove 13, and the lower housing sealing strip 18 is bonded to the second groove 14 and the second flange groove 15. The upper housing sealing strip 17 and the lower housing sealing strip 18 are misaligned and fitted together.

[0055] (5) Fasten the upper shell 1 and the lower shell 2 together, and connect and fix the bolts 21 through the upper thickened flange hole 9, the upper flange hole 4, the lower flange hole 6 and the lower thickened flange hole 11 in sequence to obtain a composite material clamp for pipeline emergency repair.

[0056] The composite material clamp for pipeline emergency repair obtained through the above steps has a variable diameter design that differs from existing clamps with the same diameter. It can adapt to pipelines of various sizes and models, and can also meet the emergency repair conditions of oil and gas pipelines with leakage conditions of more than 30% deformation, thus expanding its application range. At the same time, the second flange groove 15 of the composite material clamp is staggered with the first flange groove 13, which facilitates the secure bonding of the upper shell sealing strip 17 and the lower shell sealing strip 18 to the upper shell 1 and the lower shell 2, respectively, forming a staggered seal through vertical compression. A third groove 16 is formed at the connection between the upper shell 1 and the lower shell 2. Rounded corner sealing strips 19 are bonded in the third grooves 16 on the left and right sides. The rounded corner sealing strips 19 work together with the upper shell sealing strips 17 and the lower shell sealing strips 18 to achieve the best sealing performance when the upper shell 1 and the lower shell 2 are connected. At the same time, the rounded corner sealing strips 19 can also perfectly match the rounded corner design of the corner position of the composite material process characteristics, effectively solving the problem that the rounded corner processing of composite materials cannot effectively seal the corners.

[0057] like Figure 2 , Figure 3 As shown, in this embodiment, the upper thickened flanges 8, which are located on both sides of the upper shell 1, are prepared using a composite material vacuum infusion process. The upper thickened flanges 8 and 10 can be integrally cast or in stages. The inner surface shape of the upper thickened flange 8 follows the shape of the outer wall of the upper shell 1, and the outer surface shape of the upper thickened flange 8 follows the shape of the upper flange edge 3. Upper thickened flange holes 9, which correspond one-to-one with the upper flange holes 4, are opened along the upper length of the upper thickened flange 8. The lower thickened flanges 10, which are located on both sides of the lower shell 2, are prepared using carbon fiber composite material and a vacuum infusion process. The inner surface shape of the lower thickened flange 10 follows the shape of the outer wall of the lower shell 2, and the outer surface shape of the lower thickened flange 10 follows the shape of the lower flange edge 5. Lower thickened flange holes 11, which correspond one-to-one with the lower flange holes 6, are opened along the upper length of the lower thickened flange 10. The upper thickened flanges 8 and 10 can improve the rigidity and stability of the bolted connection.

[0058] like Figure 9 As shown, the rounded corner sealing strip 19 of this embodiment has a triangular cross-section, and the two sides of the rounded corner sealing strip 19 are arc-shaped grooves. Each arc-shaped groove is provided with an upper embedding groove 20 for embedding the upper housing sealing strip 17 and a lower embedding groove for embedding the lower housing sealing strip 18. The upper embedding groove 20 and the lower embedding groove provided at both ends of the rounded corner sealing strip 19 are tightly fitted with the upper housing sealing strip 17 and the lower housing sealing strip 18, respectively, to form a good seal.

[0059] In this embodiment, the upper shell 1 and lower shell 2 are prepared using a vacuum injection process with carbon fiber composite materials. Unlike existing pipe clamps made of metal and epoxy-based high compressive strength filler materials, the application of carbon fiber composite materials can significantly reduce the self-weight of the emergency repair pipe clamps. This can effectively solve the problem of the large weight and inconvenience of construction of existing repair tools. The high strength and high rigidity of carbon fiber composite materials can improve the structural safety of emergency repair pipes, while also giving the pipe clamps excellent corrosion resistance and fatigue resistance.

[0060] In this embodiment, the upper housing sealing strip 17, the lower housing sealing strip 18, and the rounded corner sealing strip 19 are made of hard rubber, which can effectively seal the receiving cavity 7 and ensure airtightness.

[0061] In this embodiment, the upper thickened flange 8 and the lower thickened flange 10 are prepared using a vacuum injection process.

[0062] In this embodiment, the thickness of the upper thickened flange 8 is 110-150mm; the thickness of the lower thickened flange 10 is 110-150mm, which helps to improve the rigidity and stability of the bolted connection; the length of the upper shell 1 is 750-1000mm, and the length of the lower shell 2 is 750-1000mm; the wall thickness of the upper shell 1 is 30-50mm, and the wall thickness of the lower shell 2 is 30-50mm, which can adapt to pipes of various sizes and models, thus expanding the scope of application.

[0063] In this embodiment, the thickness of the upper flange edge 3 is 30-50mm, and the thickness of the lower flange edge 5 is 30-50mm, which improves the connection strength between the upper shell 1 and the lower shell 2 and makes them less prone to deformation and separation.

[0064] like Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, this embodiment provides a composite material clamp obtained based on the preparation method of the composite material clamp for pipeline emergency repair as described in any one of the preceding claims. The clamp includes an upper shell 1 and a lower shell 2. The upper shell 1 has outwardly extending upper flange edges 3 on opposite sides. Each upper flange edge 3 is provided with upper flange holes 4 at intervals along its length. The lower shell 2 has lower flange edges 5 on both sides corresponding to the upper flange edges 3. Each lower flange edge 5 is provided with lower flange holes 6 at intervals along its length. The upper shell 1 and the lower shell 2 surround a receiving cavity 7. This variable diameter design, unlike the existing clamp form with the same diameter, can adapt to pipelines of various sizes and models, and can also meet the emergency repair conditions of oil and gas pipelines with leakage conditions of more than 30% deformation, thus expanding the scope of application.

[0065] At least one first groove 12 is provided at the front end and rear end of the upper housing 1. First flange grooves 13 are provided on the upper flange edges 3 on both sides of the upper housing 1, which are connected to the first groove 12. At least one second groove 14 is provided at the front end and rear end of the lower housing 2. The first groove 12 and the second groove 14 are staggered vertically. Second flange grooves 15 are provided on the lower flange edges 5 on both sides, which are connected to the second groove 14. The second flange grooves 15 are staggered with the first flange grooves 13, which facilitates the upper housing sealing strip 17 and the lower housing sealing strip 18 to be firmly bonded to the upper housing 1 and the lower housing 2 respectively, forming a staggered seal.

[0066] The connection between the upper housing 1 and the upper flange 3 is rounded, and the connection between the lower housing 2 and the lower flange 5 is also rounded, forming a third groove 16 on the inner wall of the connection between the upper housing 1 and the lower housing 2. Rounded corner sealing strips 19 are bonded in the third grooves 16 on the left and right sides. While enhancing its sealing performance, the rounded corner sealing strips 19 perfectly match the corner rounding design of the composite material process characteristics, effectively solving the problem that the corners of composite materials cannot be effectively sealed by rounding.

[0067] The upper housing sealing strip 17 is bonded to the first groove 12 and the first flange groove 13, and the lower housing sealing strip 18 is bonded to the second groove 14 and the second flange groove 15. The upper housing sealing strip 17 and the lower housing sealing strip 18 are misaligned and fitted together. The upper housing sealing strip 17 and the lower housing sealing strip 18 achieve a sealing effect through vertical compression. At the same time, they are used in conjunction with the rounded corner sealing strip 19 to achieve the best sealing performance when the upper housing 1 and the lower housing 2 are fastened together.

[0068] The upper housing 1 and the lower housing 2 are fastened together, and bolts 21 are passed through the upper thickened flange hole 9, the upper flange hole 4, the lower flange hole 6 and the lower thickened flange hole 11 in sequence to connect and fix them, thus obtaining a composite material clamp for pipeline emergency repair.

[0069] like Figure 2 , Figure 3 As shown, in this embodiment, composite materials are used to prepare the upper thickened flanges 8 on both sides of the upper shell 1. The inner surface shape of the upper thickened flange 8 follows the shape of the outer wall of the upper shell 1, and the outer surface shape of the upper thickened flange 8 follows the shape of the upper flange edge 3. Upper thickened flange holes 9 are opened at intervals along the upper length of the upper thickened flange 8, corresponding one-to-one with the upper flange holes 4. Lower thickened flanges 10 are prepared on both sides of the lower shell 2 using carbon fiber composite materials and vacuum infusion process. The inner surface shape of the lower thickened flange 10 follows the shape of the outer wall of the lower shell 2, and the outer surface shape of the lower thickened flange 10 follows the shape of the lower flange edge 5. Lower thickened flange holes 11 are opened at intervals along the upper length of the lower thickened flange 10, corresponding one-to-one with the lower flange holes 6. The upper thickened flanges 8 and lower thickened flanges 10 can improve the stiffness and stability of the bolted connection.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a composite material clamp for pipeline emergency repair, characterized in that: Includes the following steps: The upper shell (1) and the lower shell (2) are made of carbon fiber composite material. The upper shell (1) has outwardly extending upper flange edges (3) on opposite sides. Each upper flange edge (3) is provided with upper flange holes (4) at intervals along its length. The lower shell (2) has lower flange edges (5) on both sides corresponding to the upper flange edges (3). Each lower flange edge (5) is provided with lower flange holes (6) at intervals along its length. The upper shell (1) and the lower shell (2) surround a receiving cavity (7). The diameter of the middle part of the receiving cavity (7) is larger than the diameter of its two ends. At least one first groove (12) is opened at the front end and the rear end of the upper shell (1). A first flange groove (13) communicating with the first groove (12) is opened on the upper flange edge (3) on both sides of the upper shell (1). At least one second groove (14) is opened at the front end and the rear end of the lower shell (2). The first groove (12) and the second groove (14) are staggered vertically. A second flange groove (15) communicating with the second groove (14) is opened on the lower flange edge (5) on both sides. The second flange groove (15) is staggered with the first flange groove (13). The upper shell (1) and the upper flange (3) are connected with rounded corners, and the lower shell (2) and the lower flange (5) are connected with rounded corners, so that a third groove (16) is formed on the inner wall of the connection between the upper shell (1) and the lower shell (2). Rounded corner sealing strips (19) are glued in the third grooves (16) on the left and right sides. The upper housing sealing strip (17) is bonded to the first groove (12) and the first flange groove (13), and the lower housing sealing strip (18) is bonded to the second groove (14) and the second flange groove (15). The upper housing sealing strip (17) and the lower housing sealing strip (18) are misaligned and bonded together. The upper housing (1) and the lower housing (2) are fastened together and fixed with bolts (21) to obtain a composite material clamp for pipeline emergency repair.

2. The method for preparing the composite material clamp for pipeline emergency repair according to claim 1, characterized in that: The upper thickened flanges (8) on both sides of the upper shell (1) are made of carbon fiber composite material. The inner side of the upper thickened flange (8) is shaped to match the outer wall of the upper shell (1). The outer side of the upper thickened flange (8) is shaped to match the upper flange edge (3). The upper thickened flange (8) has upper thickened flange holes (9) that correspond one-to-one with the upper flange holes (4) at intervals along its upper length. The lower thickened flanges (10) on both sides of the lower shell (2) are made of carbon fiber composite material. The inner side of the lower thickened flange (10) is shaped to match the outer wall of the lower shell (2). The outer side of the lower thickened flange (10) is shaped to match the lower flange edge (5). The lower thickened flange (10) has lower thickened flange holes (11) that correspond one-to-one with the lower flange holes (6) at intervals along its upper length.

3. The method for preparing the composite material clamp for pipeline emergency repair according to claim 2, characterized in that: The rounded corner sealing strip (19) has a triangular cross section. The two sides of the rounded corner sealing strip (19) are arc-shaped grooves. Each arc-shaped groove is provided with an upper embedding groove (20) for embedding the upper housing sealing strip (17) and a lower embedding groove for embedding the lower housing sealing strip (18).

4. The method for preparing the composite material clamp for pipeline emergency repair according to claim 3, characterized in that: The upper shell (1) and the lower shell (2) were prepared by vacuum infusion process.

5. The method for preparing the composite material clamp for pipeline emergency repair according to claim 4, characterized in that: The upper housing sealing strip (17), the lower housing sealing strip (18), and the rounded corner sealing strip (19) are made of hard rubber.

6. The method for preparing the composite material clamp for pipeline emergency repair according to claim 5, characterized in that: The upper thickened flange (8) and the lower thickened flange (10) were prepared by vacuum injection process.

7. The method for preparing the composite material clamp for pipeline emergency repair according to claim 6, characterized in that: The thickness of the upper thickened flange (8) is 110-150mm; the thickness of the lower thickened flange (10) is 110-150mm; the length of the upper shell (1) is 750-1000mm, the length of the lower shell (2) is 750-1000mm; the wall thickness of the upper shell (1) is 30-50mm, and the wall thickness of the lower shell (2) is 30-50mm.

8. The method for preparing the composite material clamp for pipeline emergency repair according to claim 7, characterized in that: The thickness of the upper flange edge (3) is 30-50mm, and the thickness of the lower flange edge (5) is 30-50mm.

9. A composite material clamp obtained by the preparation method of a composite material clamp for pipeline emergency repair as described in any one of claims 1-8, characterized in that: The upper shell (1) and the lower shell (2) are provided with outwardly extending upper flange edges (3) on opposite sides of the upper shell (1). Each upper flange edge (3) is provided with upper flange holes (4) at intervals along the length. The lower shell (2) is provided with lower flange edges (5) on both sides corresponding to the upper flange edges (3). Each lower flange edge (5) is provided with lower flange holes (6) at intervals along the length. The upper shell (1) and the lower shell (2) surround a receiving cavity (7). The diameter of the middle part of the receiving cavity (7) is larger than the diameter of its two ends. At least one first groove (12) is provided at the front and rear ends of the upper shell (1), and a first flange groove (13) is provided on the upper flange edge (3) on both sides, which communicates with the first groove (12). At least one second groove (14) is provided at the front and rear ends of the lower shell (2), which is offset from the first groove (12). A second flange groove (15) is provided on the lower flange edge (5) on both sides, which communicates with the second groove (14). The second flange groove (15) is offset from the first flange groove (13). A third groove (16) is formed on the inner wall at the connection between the upper shell (1) and the lower shell (2). The upper housing sealing strip (17) is bonded to the first groove (12) and the first flange groove (13); the rounded corner sealing strip (19) is bonded to the third groove (16) on the left; the lower housing sealing strip (18) is bonded to the second groove (14) and the second flange groove (15); the rounded corner sealing strip (19) is bonded to the third groove (16) on the right; the upper housing sealing strip (17) and the lower housing sealing strip (18) are misaligned and fitted together; the upper housing (1) and the lower housing (2) are connected together by bolts (21).

10. The composite material clamp according to claim 9, characterized in that: It also includes upper thickened flanges (8) on both sides of the upper shell (1), the inner side of the upper thickened flange (8) follows the shape of the outer wall of the upper shell (1), the outer side of the upper thickened flange (8) follows the shape of the upper flange edge (3), and upper thickened flange holes (9) are opened at intervals along the upper length of the upper thickened flange (8) corresponding to the upper flange holes (4); lower thickened flanges (10) on both sides of the lower shell (2), the inner side of the lower thickened flange (10) follows the shape of the outer wall of the lower shell (2), the outer side of the lower thickened flange (10) follows the shape of the lower flange edge (5), and lower thickened flange holes (11) are opened at intervals along the upper length of the lower thickened flange (10) corresponding to the lower flange holes (6).

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