A pipe repair material and a pipe

Abstract

This utility model discloses a pipe repair material and a pipe, relating to the field of pipe repair technology. It includes: a surface layer annularly attached to the inner wall of the pipe to be repaired, comprising a basalt chopped fiber layer and multiple layers of first polyester fiber felt. A basalt chopped fiber layer is disposed between adjacent first polyester fiber felt layers, and a first polyester fiber felt layer is disposed on both sides of any basalt chopped fiber layer. The first polyester fiber felt layer and the basalt chopped fiber layer are needle-punched together to form an integrated structure. In this utility model, the basalt chopped fiber layer is disposed between two layers of polyester fiber felt. During the needle-punching process of the basalt chopped fiber layer and the polyester fiber felt layer, the basalt chopped fiber can penetrate into the polyester fiber felt layers on both sides to provide reinforcement. The basalt chopped fiber, combined with the polyester fiber felt, can improve both the interlayer bonding strength and the corrosion resistance of the overall surface layer.

Description

Technical Field

[0001] This utility model relates to the field of pipeline repair technology, and in particular to a pipeline repair material and a pipeline. Background Technology

[0002] Pipelines are commonly used devices for transporting fluids. They need to be in operation for a long time. Under prolonged use, cracks are prone to appear, which can lead to fluid leakage.

[0003] Currently, pipe repair methods mainly involve excavating and replacing the existing pipe or repairing it externally. Excavation work is time-consuming, significantly impacts road traffic, and is costly, making it unsuitable for partial damage or small-scale repairs. With the development of information technology, underground exploration technology, and materials technology, trenchless repair technology has emerged. A new process and materials that facilitate construction and on-site operation have become an urgent problem to solve. This process and materials need to possess the following advantages: 1. No need for large-scale excavation; construction can be carried out using existing manholes; 2. Convenient on-site operation; 3. Ability to achieve rapid repair; 4. Possessing certain strength and circumferential stiffness; 5. Pipe materials that are impermeable, water-resistant, and corrosion-resistant. Utility Model Content

[0004] The purpose of this utility model is to provide a pipe repair material and a pipe to solve the problems existing in the prior art. By utilizing the characteristics of polyester fiber felt and basalt chopped fiber, the two are combined as a pipe repair material to improve the interlayer bonding strength and corrosion resistance, thereby extending the service life. At the same time, the flexible hose flipping method of lining repair technology or non-flipping pressurization technology improves the convenience of on-site operation and construction.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a pipe repair material, comprising a surface layer that is annularly attached to the inner wall of the pipe to be repaired. The surface layer comprises a basalt chopped fiber layer and multiple layers of first polyester fiber felt. A basalt chopped fiber layer is disposed between adjacent first polyester fiber felt layers. A first polyester fiber felt layer is disposed on both sides of any basalt chopped fiber layer. The first polyester fiber felt layer and the basalt chopped fiber layer are needle-punched together to form an integrated structure.

[0006] Preferably, the surface layer further includes a first glass fiber woven fabric layer, which is located on the side of the entire surface layer close to the inner wall of the pipe to be repaired. The first glass fiber woven fabric layer and the first polyester fiber felt layer are needle-punched together to form an integrated structure.

[0007] Preferably, the width of the surface layer along the circumference of the pipe to be repaired is greater than the circumference of the inner wall of the pipe to be repaired, and the two ends of the surface layer are stacked and fixedly connected or stacked and contacted to form a ring structure.

[0008] Preferably, the pipe repair material further includes a thickening layer located on the side of the surface layer near the inner wall of the pipe to be repaired. The thickening layer includes a second polyester fiber felt layer and a second glass fiber woven fabric layer, wherein the second glass fiber woven fabric layer and the second polyester fiber felt layer are needle-punched together to form an integrated structure.

[0009] Preferably, the width of the thickened layer along the circumference of the pipe to be repaired is greater than the circumference of the inner wall of the pipe to be repaired, and the two ends of the thickened layer are stacked and fixedly connected or stacked and contacted to form a ring structure.

[0010] Preferably, the end overlapping portion of the surface layer is offset from the end overlapping portion of the thickened layer.

[0011] Preferably, a thermosetting resin layer is provided on the outer periphery of the surface layer.

[0012] Preferably, when the two ends of the surface layer are stacked and fixedly connected, the surface layer is covered with a first vacuum bag; when the two ends of the surface layer are stacked and contacted, the side of the surface layer closest to the inner wall of the pipe to be repaired is covered with a first vacuum bag, and the side away from the inner wall of the pipe to be repaired is provided with a second vacuum bag.

[0013] Preferably, the first vacuum bag has a plurality of injection holes for injecting thermosetting resin along the length of the surface layer.

[0014] This utility model also provides a pipe using the above-mentioned pipe repair material, including a pipe body and the pipe repair material, wherein the surface layer of the pipe repair material is attached to the inner wall of the pipe body.

[0015] The present invention achieves the following main technical effects compared to the prior art:

[0016] The first polyester fiber felt layer itself has good water resistance, which can extend the service life of the repair tube. On this basis, the basalt chopped fiber layer is placed between the two polyester fiber felt layers. During the needle-punching composite process of the basalt chopped fiber layer and the first polyester fiber felt layer, the basalt chopped fiber can penetrate into the first polyester fiber felt layers on both sides to play a reinforcing role. Moreover, the basalt fiber itself has good water resistance and chemical corrosion resistance, which can improve the interlayer bonding strength of the overall surface layer and also improve the corrosion resistance of the overall surface layer. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an axial view of the pipe repair material applied to the pipe to be repaired in an embodiment of this utility model.

[0019] Figure 2 This is a partially enlarged cross-sectional view of the pipe repair material applied to the pipe to be repaired in this embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure in which the surface layer and the thickened layer are staggered in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the first vacuum bag and the second vacuum bag when the end of the surface layer is stacked and fixedly connected and the end of the surface layer is stacked and contacted in an embodiment of the present utility model.

[0022] Figure 5 This is a schematic diagram of the structure when the end of the surface layer is stacked and fixedly connected in an embodiment of the present invention, and only the first vacuum bag is provided;

[0023] The components are as follows: 1. Pipe to be repaired; 2. Surface layer; 3. First polyester fiber felt layer; 4. Basalt chopped fiber layer; 5. First glass fiber woven fabric layer; 6. Overlapping section; 7. Thickened layer; 8. Second polyester fiber felt layer; 9. Second glass fiber woven fabric layer; 10. First vacuum bag; 11. Second vacuum bag; 12. Pipe repair material. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] The purpose of this utility model is to provide a pipe repair material and a pipe to solve the problems existing in the prior art. By utilizing the characteristics of polyester fiber felt and basalt chopped fiber, the two are combined as a pipe repair material to improve the interlayer bonding strength and corrosion resistance, thereby extending the service life. At the same time, the flexible hose flipping method of lining repair technology or non-flipping pressurization technology is used to improve the convenience of on-site operation and construction.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Please refer to the following: Figures 1-5 As shown, a pipe repair material 12 is provided, including a surface layer 2 that is annularly attached to the inner wall of the pipe 1 to be repaired. The surface layer 2 includes a basalt chopped fiber layer 4 and multiple layers of first polyester fiber felt 3. A basalt chopped fiber layer 4 is disposed between adjacent first polyester fiber felt layers 3. A first polyester fiber felt layer 3 is disposed on both sides of any basalt chopped fiber layer 4. The first polyester fiber felt layer 3 and the basalt chopped fiber layer 4 are needle-punched to form an integrated structure. In this embodiment, two layers of first polyester fiber felt 3 sandwiched with one layer of basalt chopped fiber layer 4 are selected as the surface layer 2. In other embodiments, three layers of first polyester fiber felt 3 sandwiched with two layers of basalt chopped fiber layer 4 or four layers of first polyester fiber felt 3 sandwiched with three layers of basalt chopped fiber layer 4 can be used as the surface layer 2, which can be selected according to actual needs.

[0028] Basalt fiber or glass fiber continuous mat can be used to replace basalt chopped fiber.

[0029] In this embodiment, the basalt chopped fiber layer 4 is formed by mixing basalt chopped fibers of various lengths, such as 50mm, 100mm, and 500mm. This allows for the formation of different spatial interweaving networks during the needle punching process, resulting in tighter interweaving between fibers and better interlayer bonding strength. In other embodiments, basalt chopped fibers of the same length can also be used as the basalt chopped fiber layer 4.

[0030] When the surface layer 2 is used as the pipe repair material 12, the first polyester fiber felt layer 3 itself has good water resistance, which can extend the service life of the repaired pipe. On this basis, the basalt chopped fiber layer 4 is placed between the two first polyester fiber felt layers 3. During the needle-punching composite process of the basalt chopped fiber layer 4 and the first polyester fiber felt layer 3, the basalt chopped fiber can penetrate into the polyester fiber felt layers on both sides to play a reinforcing role. Moreover, the basalt fiber itself has good water resistance and chemical corrosion resistance. Therefore, the surface layer 2 of the composite pipe repair material 12 has good interlayer bonding strength and corrosion resistance.

[0031] In some embodiments, the surface layer 2 may further include a first glass fiber woven fabric layer 5, which is located on the side of the overall surface layer 2 close to the inner wall of the pipe 1 to be repaired. The first glass fiber woven fabric layer 5 and the first polyester fiber felt layer 3 are needle-punched together to form an integrated structure. The first glass fiber woven fabric layer 5 can protect the first polyester fiber felt layer 3 and play a reinforcing role. Moreover, glass fiber has a much stronger corrosion resistance than cement pipes and cast iron pipes. The fiberglass formed after the repair material is cured is lightweight and high-strength. On the basis of improving corrosion resistance and service life, it is suitable for hose flipping method lining repair technology or non-flipping pressurization technology. Compared with excavation for repair or replacement, it reduces the amount of construction work.

[0032] In some embodiments, the width of the surface layer 2 along the circumference of the pipe 1 to be repaired is greater than the circumference of the inner wall of the pipe 1 to be repaired. The two ends of the surface layer 2 are stacked and fixedly connected or stacked and contacted to form a stacked part. The stacked surface layer 2 and the pipe 1 to be repaired form an annular structure. The stacked and fixed connection can be glued or sewn. When the stacked and contacted connection is made, the two ends are only in contact. By setting the stacked part 6 of the surface layer 2, the problem of gaps between the two ends of the surface layer 2 after actual connection can be avoided when the width of the produced surface layer 2 is the same as the circumference of the inner wall of the pipe 1 to be repaired due to the influence of production precision. This can ensure the closure of the two ends of the surface layer 2 to ensure a good repair effect.

[0033] The pipe repair material 12 also includes a thickening layer 7, which is located on the side of the surface layer 2 near the inner wall of the pipe 1 to be repaired. The thickening layer 7 includes a second polyester fiber felt layer 8 and a second glass fiber woven fabric layer 9. The second glass fiber woven fabric layer 9 and the second polyester fiber felt layer 8 are needle-punched together to form an integrated structure. The thickness of the overall pipe repair material 12 can be changed by selecting whether to use the thickening layer 7 and how many layers of the thickening layer 7 are used, according to actual requirements.

[0034] The first glass fiber woven fabric layer 5 and the second glass fiber woven fabric layer 9 are woven from glass fiber warp and weft yarns using a rapier loom.

[0035] To ensure the closure of both ends of the thickened layer 7, referring to the design principle of the surface layer 2, the width of the thickened layer 7 along the circumference of the pipe to be repaired 1 is set to be greater than the inner circumference of the pipe to be repaired 1. The two ends of the thickened layer 7 are stacked and fixedly connected or stacked and contacted to form a ring structure. The end stacked part 6 of the surface layer 2 and the end stacked part 6 of the thickened layer 7 are staggered to avoid the stacked parts 6 overlapping and causing a large thickness problem.

[0036] A thermosetting resin layer is provided on the outer periphery of the surface layer 2 to form a good seal with the first polyester fiber felt layer 3. At the same time, it forms a relatively smooth wall surface after subsequent curing, so as to avoid having a significant impact on the flow of fluid. The thermosetting resin layer can be formed by applying thermosetting resin to the surface layer 2 or by immersing the surface layer 2 in thermosetting resin.

[0037] In actual use, there are two installation and repair methods. The first repair method is to use the hose flipping method for lining repair. In this case, a first vacuum bag 10 is needed. The annular surface layer 2 with its ends stacked and fixedly connected is pulled into the first vacuum bag 10. During this process, the first glass fiber woven fabric layer 5 of the surface layer 2 should be located on the inside, that is, the side of the surface layer 2 away from the first vacuum bag 10. At this time, the first vacuum bag 10 and the surface layer 2 are combined into a cylindrical structure. The cylindrical structure is flipped and attached to the inner wall of the pipe 1 to be repaired using the hose flipping method for lining repair. After the installation is completed, the inner and outer parts of the cylindrical structure are replaced. The first glass fiber woven fabric layer 5 of the surface layer 2 is tightly attached to the inner wall of the pipe 1 to be repaired, and the first vacuum bag 10 is located on the inner side of the cylindrical structure.

[0038] The second repair method is: non-flipping pressurization installation. In this case, the first vacuum bag 10 and the second vacuum bag 11 are required. The specific operation steps for the end-stacked fixed connection surface layer 2 and the end-stacked contact connection surface layer 2 are also different.

[0039] When the ends of the surface layer 2 are stacked and fixedly connected, the surface layer 2 can be directly pulled into the first vacuum bag 10. During this process, the first glass fiber woven fabric layer 5 of the surface layer 2 should be located on the outside, that is, the side of the surface layer 2 close to the first vacuum bag 10. Then, the second vacuum bag 11 is pulled into the surface layer 2. The first vacuum bag 10, the surface layer 2, and the second vacuum bag 11 are arranged from the outside to the inside to form a cylindrical structure. The length of the first vacuum bag 10 and the second vacuum bag 11 should be greater than the length of the surface layer 2. The cylindrical structure can be folded once or multiple times along the width direction so that it can extend into the pipe 1 to be repaired. One end of the second vacuum bag 11 is sealed, and the sealed end of the second vacuum bag 11 is controlled to extend into the pipe 1 to be repaired along with the overall cylindrical structure. Then, the second vacuum bag 11 is pressurized from the unsealed end, which can support the entire surface layer 2 and the first vacuum bag 10 until they fit against the inner wall of the pipe 1 to be repaired.

[0040] When the ends of the surface layer 2 are overlapped and connected, the surface layer 2 is unfolded and placed on a film used to form the first vacuum bag 10. During this process, the first glass fiber woven fabric layer 5 of the surface layer 2 should be close to the film. A cylindrical second vacuum bag 11 is placed on the side of the surface layer 2 away from the film. Then, the whole is folded in the width direction. The number of folds is sufficient to allow the whole to be inserted into the pipe 1 to be repaired after folding. After folding, the two ends of the film in the width direction are sealed to form a cylindrical first vacuum bag 10. The length of the first vacuum bag 10 and the second vacuum bag 11 should be greater than the length of the surface layer 2. Finally, one end of the second vacuum bag 11 is sealed, and pressure is applied from the other end to support the entire surface layer 2 and the first vacuum bag 10 until they fit against the inner wall of the pipe 1 to be repaired.

[0041] Both the first vacuum bag 10 and the second vacuum bag 11 are made of heat-resistant (≥180℃) and expandable bag material.

[0042] In practical applications, whether the end of the surface layer 2 is stacked and fixed or the end of the surface layer 2 is stacked and contacted, after the surface layer 2 is attached to the inner wall of the pipe 1 to be repaired, hot water or steam at 80-100°C needs to be introduced into the annular space formed by the surface layer 2 to cure the thermosetting resin layer.

[0043] When a second vacuum bag 11 is set up, after the entire surface layer 2 and the first vacuum bag 10 are pressed up to fit the inner wall of the pipe 1 to be repaired, pressure needs to be maintained. After the pressure is maintained for a certain period of time without any pressure leakage, hot water or steam is then used for curing.

[0044] After the curing process is completed, the first vacuum bag 10 (the vacuum bag that was originally on the outer layer is now on the inner layer after installation due to the hose flipping method of the inner lining repair technology) or the pressurized second vacuum bag 11 on the inner side of the surface layer 2 can be pulled out.

[0045] Due to the different connection methods of the overlapping parts 6 of the surface layer 2, the operation steps and the matching vacuum bags used in subsequent applications will be different. In order to improve construction efficiency, vacuum bags can be directly equipped according to the connection method of the overlapping parts 6 of the surface layer 2 at the factory. Therefore, when the two ends of the surface layer 2 are stacked and fixedly connected, the surface layer 2 is covered with a first vacuum bag 10, and the inner layer may or may not be equipped with a second vacuum bag 11; when the two ends of the surface layer 2 are stacked and contacted, the side of the surface layer 2 closest to the inner wall of the pipe 1 to be repaired is covered with a first vacuum bag 10, and the side away from the inner wall of the pipe 1 to be repaired is equipped with a second vacuum bag 11.

[0046] Based on the first vacuum bag 10, multiple injection holes for injecting thermosetting resin can be opened on the first vacuum bag 10 along the length direction of the surface layer 2. Thermosetting resin is injected into the first vacuum bag 10 through the injection holes, so that the surface layer 2 is wetted with thermosetting resin to form a thermosetting resin layer on the outer periphery.

[0047] One method for preparing the aforementioned pipe repair material 12 includes the following steps:

[0048] S1: The first polyester fiber felt layer 3 and the basalt short fiber layer 4 are punched together to obtain the surface layer 2;

[0049] S2: Place the surface layer 2 in the first vacuum bag 10, and choose whether to place the second vacuum bag 11 in the annular space formed by the surface layer 2 according to actual needs;

[0050] S3: Seal both ends of the first vacuum bag 10 (when the second vacuum bag 11 is set, both ends of the second vacuum bag 11 are sealed) to finally form a sealed space between the first vacuum bags 10 (when the second vacuum bag 11 is set, a sealed space is formed between the first vacuum bag 10 and the second vacuum bag 11). Make injection holes on the first vacuum bag 10. While using vacuum equipment to assist in evacuating the first vacuum bag 10, thermosetting resin is injected in sections through multiple injection holes. The volume ratio of thermosetting resin to surface layer 2 is 1:1. A sealing plug is set at the injection hole for sealing. A covering layer is set on the outside of the sealing plug. The covering layer covers the sealing plug and is bonded to the bag body around the injection hole to improve the sealing effect.

[0051] S4: Use a rolling device to roll the first vacuum bag 10 until the thermosetting resin completely impregnates the surface layer 2.

[0052] After step S4 is completed, the mixture can be left to stand for a certain period of time to improve the wetting effect of the thermosetting resin.

[0053] This utility model also provides a pipe using the above-mentioned pipe repair material 12, including a pipe body and the pipe repair material 12, wherein the surface layer 2 of the pipe repair material 12 is attached to the inner wall of the pipe body.

[0054] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0055] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A pipe repair material, characterized in that, The surface layer is attached in a ring to the inner wall of the pipe to be repaired. The surface layer includes a basalt chopped fiber layer and multiple layers of first polyester fiber felt. A basalt chopped fiber layer is provided between adjacent first polyester fiber felt layers. A first polyester fiber felt layer is provided on both sides of any basalt chopped fiber layer. The first polyester fiber felt layer and the basalt chopped fiber layer are combined by needle punching to form an integrated structure.

2. The pipe repair material according to claim 1, characterized in that, The surface layer also includes a first glass fiber woven fabric layer, which is located on the side of the entire surface layer close to the inner wall of the pipe to be repaired. The first glass fiber woven fabric layer and the first polyester fiber felt layer are needle-punched together to form an integrated structure.

3. The pipe repair material according to claim 1, characterized in that, The width of the surface layer along the circumference of the pipe to be repaired is greater than the circumference of the inner wall of the pipe to be repaired, and the two ends of the surface layer are stacked and fixedly connected or stacked and contacted to form a ring structure.

4. The pipe repair material according to claim 3, characterized in that, The pipe repair material also includes a thickening layer, which is located on the side of the surface layer near the inner wall of the pipe to be repaired. The thickening layer includes a second polyester fiber felt layer and a second glass fiber woven fabric layer. The second glass fiber woven fabric layer and the second polyester fiber felt layer are needle-punched together to form an integrated structure.

5. The pipe repair material according to claim 4, characterized in that, The width of the thickened layer along the circumference of the pipe to be repaired is greater than the circumference of the inner wall of the pipe to be repaired, and the two ends of the thickened layer are stacked and fixedly connected or stacked and contacted to form a ring structure.

6. The pipe repair material according to claim 5, characterized in that, The end overlapping portion of the surface layer is offset from the end overlapping portion of the thickened layer.

7. The pipe repair material according to claim 3, characterized in that, A thermosetting resin layer is provided on the outer periphery of the surface layer.

8. The pipe repair material according to claim 7, characterized in that, When the two ends of the surface layer are stacked and fixedly connected, the surface layer is covered with a first vacuum bag; when the two ends of the surface layer are stacked and contacted, the side of the surface layer closest to the inner wall of the pipe to be repaired is covered with a first vacuum bag, and the side away from the inner wall of the pipe to be repaired is provided with a second vacuum bag.

9. The pipe repair material according to claim 8, characterized in that, The first vacuum bag has multiple injection holes for injecting thermosetting resin along the length of the surface layer.

10. A pipe, characterized in that, The application of the pipe repair material as described in any one of claims 1-9 includes a pipe body and the pipe repair material, wherein the surface layer of the pipe repair material is attached to the inner wall of the pipe body.

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