Carbon fiber composite grid structure and reinforcing construction method

Abstract

The invention provides a carbon fiber composite grid structure and a reinforcement construction method, and belongs to the technical field of building reinforcement. The carbon fiber composite grid structure comprises a plurality of warp strip layers and weft strip layers which are crossed and stacked; the warp strip layer comprises a plurality of FRP warp strips; the weft strip layer comprises a plurality of FRP weft strips; the FRP warp strips of each warp strip layer intersect with the FRP weft strips of the adjacent weft strip layer to form a grid structure, and all intersection points formed by the FRP warp strips and the FRP weft strips are fused and consolidated into a whole; wherein the FRP warp strips are in one-to-one correspondence in the thickness direction and form first interlayer gaps, and the FRP weft strips are in one-to-one correspondence in the thickness direction and form second interlayer gaps; the first interlayer gap and the second interlayer gap are both used for being immersed in grouting materials during reinforcing construction. According to the carbon fiber composite grid structure provided by the invention, the node structural strength, the anti-fatigue performance, the interface bonding reliability and the anti-stripping performance of the FRP grid can be improved.

Description

Technical Field

[0001] This invention belongs to the field of building reinforcement technology, specifically relating to a carbon fiber composite mesh structure and a reinforcement construction method. Background Technology

[0002] FRP (Fiber Reinforced Plastics) is a commonly used material in the field of building reinforcement. Existing FRP meshes mainly exist in two forms: one is a flexible woven mesh, which relies on the physical interweaving of fibers to form nodes and is cured and shaped by thermosetting resin; the other is a rigid welded mesh, which is made by welding pre-formed FRP reinforcements after adding metal connectors at the nodes, using special adhesives, or undergoing complex surface treatments.

[0003] Both of these traditional FRP mesh types have shortcomings. Flexible woven meshes, due to their physical weaving process, have low connection strength at the mesh nodes, making them prone to slippage and loosening under stress. Furthermore, their overall stiffness is poor, making them susceptible to deformation during transportation and construction, affecting reinforcement effectiveness. The bond between the flexible woven mesh and mortar relies on the surface roughness of the mesh and the adhesive to form a two-dimensional planar bond, making interlayer delamination a common problem. Rigid welded meshes, on the other hand, use dissimilar materials for their metal components and adhesives, which not only affect their durability and lead to functional degradation under long-term loads and environmental conditions, but also exhibit abrupt changes in rigidity at the mesh nodes, causing stress concentration and consequently impacting their fatigue resistance. Summary of the Invention

[0004] This invention provides a carbon fiber composite mesh structure and a reinforcement construction method, aiming to improve the nodal structural strength, fatigue resistance, interfacial bonding reliability, and peel resistance of the FRP mesh.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: Firstly, a carbon fiber composite mesh structure is provided, comprising M warp layers and N weft layers that are stacked together in a cross-layered manner, where M≥2 and N=M-1; The warp layer consists of several FRP warp strips arranged at intervals in sequence; the weft layer consists of several FRP weft strips arranged at intervals in sequence; the FRP warp strips of each warp layer intersect with the FRP weft strips of the adjacent weft layer to form a grid structure, and all intersections formed by the FRP warp strips and FRP weft strips are fused and solidified into one piece; In this structure, the FRP warp strips of each warp layer correspond one-to-one in the thickness direction to form the first interlayer gap, and the FRP weft strips of each weft layer correspond one-to-one in the thickness direction to form the second interlayer gap; both the first and second interlayer gaps are used to impregnate grout during reinforcement construction.

[0006] In conjunction with the first aspect, in one possible implementation, the top and / or bottom centers of both the FRP warp and weft strips are spaced apart with protrusions; the FRP warp strips of adjacent warp layers form a first interlayer gap under the support of the protrusions, and the FRP weft strips of adjacent weft layers form a second interlayer gap under the support of the protrusions.

[0007] For example, the FRP warp strips of adjacent warp layers are fused together as one piece through protrusions; the FRP weft strips of adjacent weft layers are fused together as one piece through protrusions.

[0008] In conjunction with the first aspect, in one possible implementation, both the FRP warp strips and the FRP weft strips are pultruded narrow strips with equal cross-sections, and the center of the top surface and / or the center of the bottom surface of the narrow strips with equal cross-sections has supporting ribs; wherein, the FRP warp strips of adjacent warp strip layers form a first interlayer gap under the support of the supporting ribs, and the FRP weft strips of adjacent weft strip layers form a second interlayer gap under the support of the supporting ribs.

[0009] For example, the FRP warp strips of adjacent warp layers are fused together as one piece by the support ribs; the FRP weft strips of adjacent weft layers are fused together as one piece by the support ribs; the gaps between the first and second layers are separated into two grooves suitable for grouting material to penetrate by the support ribs, and the support ribs are provided with grouting holes suitable for connecting the grooves on both sides.

[0010] The beneficial effects of the carbon fiber composite mesh structure provided by this invention are as follows: Compared with the prior art, the carbon fiber composite mesh structure of this invention has multiple warp and weft layers stacked in a cross-layer manner. The FRP warp and weft strips of adjacent warp and weft layers intersect to form a mesh structure. By hot-pressing and melting each intersection point of the FRP warp and weft strips to form an integral structure, the adjacent warp and weft layers can form an integral node structure at each intersection point without additional heterogeneous materials and with homogeneous materials fused together. The structural strength of each intersection point is close to the strength of the FRP material body. This not only eliminates the introduction of heterogeneous materials such as adhesive layers or metal connectors in traditional node structures, but also improves the strength and stiffness of the node structure and enhances the fatigue resistance and durability of the mesh structure.

[0011] Furthermore, adjacent warp layers form first and second interlayer gaps based on the support of the weft layers between them, and adjacent weft layers form second and third interlayer gaps based on the support of the warp layers between them, respectively. During reinforcement construction, grout can be injected into the first and second interlayer gaps, so that after the grout cures, a "grout pin structure" is formed between adjacent warp layers and adjacent weft layers. This allows the strong homopolymer (both are cement-based materials) bonding performance between the grout and the subsequently sprayed mortar to form a high-strength three-dimensional mechanical interlocking structure between the carbon fiber composite mesh structure and the mortar. Compared with the traditional two-dimensional planar bonding scheme, this can greatly improve the interface bonding strength and reliability, and improve the peel resistance performance. It can effectively prevent interlayer peeling damage in the reinforced area, thereby improving the reinforcement effect of the carbon fiber composite mesh structure.

[0012] Secondly, embodiments of the present invention also provide a reinforcement construction method for a carbon fiber composite mesh structure, comprising the following steps: The carbon fiber composite mesh structure is cut according to the dimensions of the area to be reinforced on the base surface to obtain carbon fiber composite mesh sheets; After the substrate is treated, the carbon fiber composite mesh sheet is fixed to the area to be reinforced; A sealed pressure chamber was constructed using carbon fiber composite mesh sheets. Inject grout into the sealed pressure chamber, allowing the grout to penetrate and fill the gaps between the first and second layers of the carbon fiber composite mesh sheet and maintain pressure. Remove the sealed pressure chamber and apply a mortar protective layer to the area to be reinforced before the grout cures, covering it with carbon fiber composite mesh sheets; Properly cure until the mortar protective layer is fully cured.

[0013] In conjunction with the second aspect, one possible implementation involves constructing a sealed pressure chamber around a carbon fiber composite mesh sheet, including: The carbon fiber composite mesh sheet is surrounded by sealing strips to form a wall; A high-strength film is covered on a carbon fiber composite mesh sheet, and the high-strength film is sealed and bonded to the enclosure to form a closed pressure chamber.

[0014] In some embodiments, the enclosure is provided with grouting ports and venting ports that are diagonally distributed relative to the carbon fiber composite mesh sheet.

[0015] For example, the grout is a cement-based grout or an epoxy grout, and the pressure of injecting the grout into the sealed pressure chamber is 0.1~0.3MPa; the mortar protective layer is polymer mortar.

[0016] For example, base surface treatment includes: After cleaning the area of ​​the base surface to be reinforced, roughen it. Apply an interface agent to the roughened area to be reinforced. In this process, a sealed pressure chamber is constructed before the interface agent dries, and the grouting material is injected into the sealed pressure chamber.

[0017] The beneficial effects of the carbon fiber composite mesh reinforcement construction method provided by this invention are as follows: Compared with the prior art, the carbon fiber composite mesh reinforcement construction method of this invention adopts the above-mentioned carbon fiber composite mesh structure, which not only improves the overall structural and node structural strength of the carbon fiber composite mesh sheet by hot-pressing and melting the FRP warp and weft strips into a single unit at each intersection, thereby improving the stiffness and fatigue resistance of the carbon fiber composite mesh sheet, but also fills the gaps between the first and second layers with grout by constructing a sealed pressure chamber during construction. This allows the grout to bond with the subsequently applied mortar protective layer before curing. Since the grout and mortar protective layer have good bonding performance as homogeneous materials, a high-strength three-dimensional mechanical interlocking structure can be formed between the carbon fiber composite mesh sheet and the mortar protective layer. Compared with the traditional two-dimensional planar bonding scheme, this greatly improves the interface bonding strength and reliability, and enhances the anti-peeling performance, effectively preventing interlayer peeling damage in the reinforced area, thereby improving the reinforcement effect of the carbon fiber composite mesh structure. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the carbon fiber composite mesh structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of two cross-sectional structures of the carbon fiber composite mesh structure along the radial and latitudinal directions provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of two cross-sectional structures of a carbon fiber composite mesh structure along the radial and latitudinal directions, provided in another embodiment of the present invention. Figure 4 A schematic diagram of two cross-sectional structures of a carbon fiber composite mesh structure along the radial and latitudinal directions, provided in another embodiment of the present invention; Figure 5 For along Figure 4 Schematic diagram of the cross-sectional structure along line AA; Figure 6 This is a schematic diagram of the structure of the sealed pressure chamber used in the embodiments of the present invention; Figure 7 This is a schematic diagram of the reinforced cross-sectional structure of the carbon fiber composite mesh structure provided in an embodiment of the present invention; Figure 8 A flowchart illustrating the construction process of the reinforcement method based on FRP rigid mesh provided in this embodiment of the invention; Figure 9 This is a flowchart illustrating the construction process of the sealed pressure chamber used in the embodiments of the present invention. Figure 10 This is a flowchart illustrating the base surface processing in an embodiment of the present invention.

[0019] In the diagram: 10. Warp layer; 11. FRP warp; 12. First interlayer gap; 13. Protrusion; 14. Supporting rib; 15. Groove; 16. Grouting hole; 20. Weft layer; 21. FRP weft; 22. Second interlayer gap; 30. Grouting material; 40. Sealed pressure chamber; 41. Enclosure; 42. High-strength film; 43. Grouting port; 44. Vent; 50. Mortar protective layer; 60. Interface agent. Detailed Implementation

[0020] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0021] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0022] It should be noted that in the description of this application, "warp" and "latitude" represent two different directions, and the radial and latitudinal directions intersect. Normally, the intersection of warp and latitude is perpendicular, forming a rectangular or square grid structure. However, this application is not limited to the intersection of warp and latitude being perpendicular. That is to say, in the embodiments of this application, the grid structure formed after the intersection of warp and latitude can also be a rhomboid or parallelogram grid structure. The use of "warp" and "latitude" in this description is only for the convenience of understanding the technical solution.

[0023] Based on the above limitations, for ease of understanding and description, the following embodiments are explained in the form of perpendicular intersections of "longitude" and "latitude".

[0024] Please refer to the following: Figures 1 to 7 The carbon fiber composite mesh structure provided by the present invention will now be described. The carbon fiber composite mesh structure includes M warp layers 10 and N weft layers 20 that are stacked together in a cross-layered manner, where M≥2 and N=M-1.

[0025] It should be noted that in this embodiment, the warp layer 10 is the main load-bearing layer, with one more layer than the weft layer. When reinforcing the carbon fiber composite mesh structure, the installation direction can be determined according to whether the reinforcement scheme requires radial or weft-direction load-bearing. If radial load-bearing is the main load-bearing, the warp layer 10 should be placed parallel to the radial direction in the reinforcement area; if weft load-bearing is the main load-bearing, the warp layer 10 should be placed parallel to the weft direction in the reinforcement area.

[0026] The warp layer 10 includes a number of FRP warp strips 11 arranged at intervals in sequence; the weft layer 20 includes a number of FRP weft strips 21 arranged at intervals in sequence; the FRP warp strips 11 of each warp layer 10 intersect with the FRP weft strips 21 of the adjacent weft layer 20 to form a grid structure, and each intersection point formed by the FRP warp strips 11 and the FRP weft strips 21 is fused and solidified into one piece.

[0027] It should be noted that in this embodiment, the FRP warp strip 11 can be understood as a narrow FRP strip extending radially, and the FRP weft strip 21 can be understood as a narrow FRP strip extending latitudinally. During processing, a layer of FRP warp strip 11 can be laid on the hot-melt bottom mold first, then a layer of FRP weft strip 21 can be laid on top, and then another layer of FRP warp strip 11 can be laid on top, and so on, interleaving until the last layer of FRP warp strip 11 is laid. Then, the hot-melt top mold is pressed down. It should be noted that hot-melt point arrays are set on the pressing surfaces of both the hot-melt bottom mold and the hot-melt top mold, corresponding to the intersections of the FRP warp strip 11 and the FRP weft strip 21. After the hot-melt top mold is pressed onto the hot-melt bottom mold, each hot-melt point heats the intersections of the FRP warp strip 11 and the FRP weft strip 21. After the material at the intersections melts and combines together, it is cooled and solidified, thereby hot-pressing and melting the material at each intersection into a single unit.

[0028] In this process, the FRP warp strips 11 of each warp layer 10 correspond one-to-one in the thickness direction to form the first interlayer gap 12, and the FRP weft strips 21 of each weft layer 20 correspond one-to-one in the thickness direction to form the second interlayer gap 22; the first interlayer gap 12 and the second interlayer gap 22 are both used to immerse the grouting material 30 during the reinforcement construction.

[0029] It should be explained that in this embodiment, the FRP warp strips 11 and FRP weft strips 21 are aligned layer by layer in the thickness direction. Since the adjacent FRP warp strips 11 are supported by the FRP weft strips 21 at each intersection point, and the adjacent FRP weft strips 21 are supported by the FRP warp strips 11 at each intersection point, when hot-pressing and melting at each intersection point, it is only necessary to control the hot-melt depth of the FRP warp strips 11 and FRP weft strips 21 to form a first interlayer gap 12 between the FRP warp strips 11 at the corresponding positions in the thickness direction and a second interlayer gap 22 between the corresponding FRP weft strips 21. For example, if the melt depth of FRP warp strip 11 and FRP weft strip 21 at the intersection is one-third of their respective thicknesses, then the resulting first interlayer gap 12 is one-third of the thickness of FRP weft strip 21, and the second interlayer gap 22 is one-third of the thickness of FRP warp strip 11. Of course, in this embodiment, FRP warp strip 11 and FRP weft strip 21 can be FRP narrow strips with completely identical cross-sectional structures, so the dimensions of the first interlayer gap 12 and the second interlayer gap 22 are the same.

[0030] During the reinforcement construction, the low-viscosity, high-flowability grout 30, such as cement-based grout 30 or epoxy grout 30, can penetrate into the first interlayer gap 12 and the second interlayer gap 22 when filling the inside of the grid. After the grout 30 is cured, it is equivalent to forming grout pins between the layers, thereby forming a three-dimensional mechanical interlock for the carbon fiber composite grid structure. Compared with the traditional planar bonding method, this structure can not only effectively guarantee the strength and stiffness, but also improve the fatigue resistance and durability.

[0031] Based on this, polymer mortar can be sprayed onto the reinforced area before the grout 30 cures, covering the carbon fiber composite mesh structure. This allows the polymer mortar and the grout to cure and bond together to form an integrated structure. Since both the grout 30 and the polymer mortar are cement-based, compared to the traditional method of bonding FRP rigid mesh with metal connectors or adhesives, this method can significantly improve the bonding strength and peel resistance of the polymer mortar and the carbon fiber composite mesh structure.

[0032] Compared with the prior art, the carbon fiber composite mesh structure provided in this embodiment has multiple warp layers 10 and weft layers 20 stacked in a cross-layer manner. The FRP warp strips 11 and FRP weft strips 21 of adjacent warp layers 10 and weft layers 20 intersect to form a mesh structure. By hot-pressing and melting each intersection point of FRP warp strips 11 and FRP weft strips 21 to form an integral structure, the adjacent warp layers 10 and weft layers 20 can form an integral node structure at each intersection point without additional heterogeneous materials and with homogeneous materials fused together. The structural strength of each intersection point is close to the strength of the FRP material body. This not only eliminates the introduction of heterogeneous materials such as adhesive layers or metal connectors in traditional node structures, but also improves the strength and stiffness of the node structure and enhances the fatigue resistance and durability of the mesh structure.

[0033] Furthermore, adjacent warp layers 10, supported by weft layers 20, and adjacent weft layers 20, supported by warp layers 10, respectively form a first interlayer gap 12 and a second interlayer gap 22. During reinforcement construction, grout 30 can be injected through the first interlayer gap 12 and the second interlayer gap 22. After the grout 30 cures, it forms a "grout pin structure" between adjacent warp layers 10 and adjacent weft layers 20. This allows the strong homopolymer bonding between the grout 30 and the subsequently sprayed mortar to form a high-strength three-dimensional mechanical interlocking structure between the carbon fiber composite mesh structure and the mortar. Compared with the traditional two-dimensional planar bonding scheme, this greatly improves the interface bonding strength and reliability, and enhances the anti-peeling performance. It can effectively prevent interlayer peeling damage in the reinforced area, thereby improving the reinforcement effect of the carbon fiber composite mesh structure.

[0034] As a variation of the aforementioned carbon fiber composite mesh structure, please refer to Figure 3 The top and / or bottom centers of the FRP warp strips 11 and FRP weft strips 21 are each provided with a raised dot 13 at intervals; the FRP warp strips 11 of adjacent warp strip layers 10 form a first interlayer gap 12 under the support of the raised dot 13, and the FRP weft strips 21 of adjacent weft strip layers 20 form a second interlayer gap 22 under the support of the raised dot 13.

[0035] The FRP warp strip 11 facing the FRP weft strip 21 or the FRP weft strip 21 facing the FRP warp strip 11 has spaced protrusions 13. These protrusions 13 serve two purposes: firstly, they support the FRP warp strip 11 and FRP weft strip 21, preventing the first interlayer gap 12 and the second interlayer gap 22 from collapsing under stress before the grout 30 cures; secondly, they form holes between adjacent protrusions 13 to allow the grout 30 to flow through, thus ensuring that the grout 30 can fill the first interlayer gap 12 and the second interlayer gap 22 during grouting, thereby ensuring the reliability of the bond between the grout 30 and the FRP warp strip 11 and FRP weft strip 21 after curing.

[0036] Optionally, the protrusions 13 on the FRP warp strips 11 and FRP weft strips 21 can be obtained by hot-melt molding. Both the FRP warp strips 11 and FRP weft strips 21 have protrusions 13 distributed on their surfaces facing each other, and the protrusions 13 are staggered or correspond one-to-one, thus achieving the supporting function of the protrusions 13 for the first interlayer gap 12 and the second interlayer gap 22, and ensuring that there are holes between the protrusions 13 for the grout 30 to flow through.

[0037] Specifically, such as Figure 3 As shown, in this embodiment, the FRP warp strips 11 corresponding to each other in adjacent warp strip layers 10 are fused and solidified into one piece through the protrusions 13; the FRP weft strips 21 corresponding to each other in adjacent weft strip layers 20 are fused and solidified into one piece through the protrusions 13.

[0038] While the warp layer 10 and weft layer 20 are hot-pressed and fused together at each intersection, the parts with protrusions 13 are also hot-pressed and fused together. Thus, after the protrusions 13 are fused, the adjacent FRP warp strips 11 and the adjacent FRP weft strips 21 are fused together, thereby improving the overall structural strength and stiffness of the carbon fiber composite mesh structure.

[0039] As another variation of the aforementioned carbon fiber composite mesh structure, please refer to Figure 4 Both FRP warp strips 11 and FRP weft strips 21 are pultruded narrow strips with equal cross-sections, and the center of the top surface and / or the center of the bottom surface of the narrow strips with equal cross-sections have supporting ribs 14; wherein, the FRP warp strips 11 of adjacent warp strip layers 10 form a first interlayer gap 12 under the support of the supporting ribs 14, and the FRP weft strips 21 of adjacent weft strip layers 20 form a second interlayer gap 22 under the support of the supporting ribs 14.

[0040] FRP warp strips 11 and FRP weft strips 21 can be narrow strips with the same cross-sectional shape, which can be processed by pultrusion molding, thereby reducing processing costs and process difficulty. The narrow strips with the same cross-section can be I-shaped, T-shaped, or cross-shaped, which allows the support ribs 14 formed at the center of the narrow strips to provide stable support for the first interlayer gap 12 and the second interlayer gap 22. This prevents the first interlayer gap 12 and the second interlayer gap 22 from collapsing and deforming before the grout 30 cures, ensuring sufficient grout 30 is impregnated in the first interlayer gap 12 and the second interlayer gap 22 before the grout 30 cures. This, in turn, helps to improve the bonding strength and interface performance between the grout 30 and the carbon fiber composite mesh structure.

[0041] It should be noted that, as Figure 4As shown, in this embodiment, the FRP warp strips 11 corresponding to each other in adjacent warp strip layers 10 are fused and solidified into one piece by the support ribs 14; the FRP weft strips 21 corresponding to each other in adjacent weft strip layers 20 are fused and solidified into one piece by the support ribs 14; the first interlayer gap 12 and the second interlayer gap 22 are both separated by the support ribs 14 into two grooves 15 suitable for the grout 30 to be immersed in, and the support ribs 14 are provided with grout passage holes 16 suitable for connecting the grooves 15 on both sides.

[0042] Here, the support ribs 14 are used to fuse and solidify the adjacent FRP warp strips 11 and adjacent FRP weft strips 21 into an integral structure. This increases the connection of the support ribs 14 on top of the bonding force provided by the grout 30, thereby improving the overall structural strength and stiffness of the carbon fiber composite mesh structure. Furthermore, to ensure the flowability of the grout 30 during the grouting process, grout passage holes 16 are provided on the support ribs 14 to connect the grooves 15 formed by the first interlayer gap 12 and the second interlayer gap 22. This prevents the support ribs 14 from blocking the grout 30 and affecting the grout compactness, thus ensuring that each groove 15 can be fully immersed in the grout 30, thereby improving the bonding strength and interfacial performance between the grout 30 and the carbon fiber composite mesh structure.

[0043] Based on the same inventive concept, combined with Figures 1 to 10 It is understood that this application also provides a reinforcement construction method for a carbon fiber composite mesh structure, including the following steps: S100, the carbon fiber composite mesh structure is cut according to the size of the area to be reinforced on the base surface to obtain carbon fiber composite mesh sheet; S200, after the base surface is treated, the carbon fiber composite mesh sheet is fixed to the area to be reinforced; S300, a sealed pressure chamber 40 is constructed around a carbon fiber composite mesh sheet; S400, inject grout 30 into the sealed pressure chamber 40, so that the grout 30 penetrates and fills each first interlayer gap 12 and each second interlayer gap 22 of the carbon fiber composite mesh sheet and maintains pressure. S500, remove the sealed pressure chamber 40 and apply a mortar protective layer 50 to the area to be reinforced before the grout 30 cures, covering the carbon fiber composite mesh sheet. S600, standard curing until the mortar protective layer is 50% cured.

[0044] The reinforcement construction method of the carbon fiber composite mesh structure provided in this embodiment, compared with the prior art, adopts the above-mentioned carbon fiber composite mesh structure. It can not only improve the overall structural and nodal structural strength of the carbon fiber composite mesh sheet by hot-pressing and melting the various intersections of FRP warp strips 11 and FRP weft strips 21 into a whole, thereby improving the stiffness and fatigue resistance of the carbon fiber composite mesh sheet, but also fill the first interlayer gap 12 and the second interlayer gap 22 with grout 30 by constructing a sealed pressure chamber 40 during the construction process. This allows the grout 30 to bond with the subsequently applied mortar protective layer 50 before curing. Since the grout 30 and the mortar protective layer 50 have good bonding performance as homogeneous materials, a high-strength three-dimensional mechanical interlocking structure can be formed between the carbon fiber composite mesh sheet and the mortar protective layer 50. Compared with the traditional two-dimensional planar bonding scheme, this can greatly improve the interface bonding strength and reliability, and improve the peel resistance. It can effectively prevent interlayer peeling damage in the reinforced area, thereby improving the reinforcement effect of the carbon fiber composite mesh structure.

[0045] In addition, after the grouting material 30 is injected during construction, the sealed pressure chamber 40 can be removed after a short period of pressure holding to carry out the subsequent mortar spraying work. This not only improves the bonding strength between the mortar and the grouting material 30, but also saves the time of waiting for the grouting material 30 to cure. Compared with the traditional two-dimensional planar bonding process, which requires waiting for the adhesive to cure before spraying mortar, this can significantly improve the efficiency of reinforcement construction.

[0046] Among some possible implementations, such as Figure 9 As shown, in step S300 above, constructing a sealed pressure chamber 40 around the carbon fiber composite mesh sheet includes: S301, the carbon fiber composite mesh sheet is surrounded by sealing strips to form a wall 41; S302, a high-strength film 42 is covered on the carbon fiber composite mesh sheet, and the high-strength film 42 is sealed and bonded to the enclosure 41 to form a closed pressure chamber 40.

[0047] Sealing strips are attached around the perimeter of the carbon fiber composite mesh sheet to seal the perimeter and form a surrounding wall 41. Then, a high-strength film 42 is attached to each of the top FRP warp strips 11 and the surrounding wall 41 to form a sealed pressure chamber 40 covering the carbon fiber composite mesh sheet. Grouting material 30 is injected into the sealed pressure chamber 40 under pressure. The high fluidity of the grouting material 30 allows it to automatically penetrate into each mesh area of ​​the carbon fiber composite mesh sheet, the first interlayer gap 12, and the second interlayer gap 22. After the sealed pressure chamber 40 is filled with grouting material 30, it is maintained under pressure for a certain period of time before the sealed pressure chamber 40 can be removed.

[0048] Specifically, the high-strength film 42 can be a transparent nylon film, through which the grouting situation inside the sealed pressure chamber 40 can be directly observed, ensuring the compactness of the grouting inside the sealed pressure chamber 40.

[0049] It should be noted that you should refer to [link / reference]. Figure 6 The aforementioned enclosure 41 is provided with grouting ports 43 and venting ports 44 that are diagonally distributed relative to the carbon fiber composite mesh sheet.

[0050] The grouting port 43 and the vent port 44 are arranged diagonally to maximize the distance between them. When the grouting material 30 is injected into the sealed pressure chamber 40 through the grouting port 43, the air in the sealed pressure chamber 40 is discharged through the vent port 44. The grouting process depends on the high fluidity of the grouting material 30. It gradually flows into each grid of the carbon fiber composite mesh sheet through each first interlayer gap 12 and second interlayer gap 22 until the last grid is filled. Then the grouting material 30 begins to flow out of the vent port 44.

[0051] Based on this, the grouting situation inside the sealed pressure chamber 40 is observed through the high-strength membrane 42. After confirming that the grouting material 30 has indeed filled the sealed pressure chamber 40, grouting is stopped, and the grouting port 43 and the vent port 44 are sealed to maintain pressure. The grouting process is simple and convenient, and the setting of the grouting port 43 and the vent port 44 helps to improve grouting efficiency.

[0052] Optionally, in this embodiment, the grouting material 30 is a cement-based grouting material 30 or an epoxy grouting material 30, and the pressure at which the grouting material 30 is injected into the sealed pressure chamber 40 is 0.1~0.3MPa; the mortar protective layer 50 is a polymer mortar.

[0053] Cement-based grout 30 and epoxy grout 30 exhibit excellent bonding strength with polymer mortar, enhancing the bond strength and peel resistance between the mortar protective layer 50 and the carbon fiber composite mesh sheet after curing. Applying a pressure of 0.1~0.3 MPa during grouting forces the grout 30 to fully saturate the gaps 12 between the first and second layers 22, thereby improving the three-dimensional mechanical interlocking effect of the grout 30 on the carbon fiber composite mesh sheet after curing. Compared to traditional two-dimensional surface bonding methods, this increases the interfacial peel resistance by more than 50%, effectively preventing peeling damage in the reinforced area.

[0054] It is necessary to understand that, such as Figure 10 As shown, in step S100 above, the base surface processing includes: S101, After cleaning the area of ​​the base surface to be reinforced, roughen it; S102, Apply interface agent 60 to the roughened area to be reinforced; Specifically, a sealed pressure chamber 40 is constructed before the interface agent 60 dries, and the grouting material 30 is injected into the sealed pressure chamber 40.

[0055] The area to be reinforced on the substrate is cleaned and roughened, and an interface agent 60, such as epoxy resin, is applied. This improves the bonding strength between the grout 30 and the area to be reinforced. Injecting the grout 30 into the sealed pressure chamber 40 before the interface agent 60 dries ensures that the grout 30 and the interface agent 60 are fully integrated, further improving the interface performance.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A carbon fiber composite mesh structure, characterized in that, It consists of M warp stripe layers and N weft stripe layers that are stacked together in a cross-over pattern, where M≥2 and N=M-1; The warp layer includes a plurality of FRP warp strips arranged at intervals in sequence; the weft layer includes a plurality of FRP weft strips arranged at intervals in sequence; each FRP warp strip of the warp layer intersects with the FRP weft strip of the adjacent weft layer to form a grid structure, and each intersection point formed by the FRP warp strips and the FRP weft strips is fused and solidified into one piece; In this process, the FRP warp strips of each warp layer correspond one-to-one in the thickness direction to form a first interlayer gap, and the FRP weft strips of each weft layer correspond one-to-one in the thickness direction to form a second interlayer gap; both the first interlayer gap and the second interlayer gap are used to impregnate grout during reinforcement construction.

2. The carbon fiber composite mesh structure as described in claim 1, characterized in that, The FRP warp and weft strips have raised dots distributed at intervals on the center of their top and / or bottom surfaces. The FRP warp strips of adjacent warp layers form the first interlayer gap under the support of the raised dots, and the FRP weft strips of adjacent weft layers form the second interlayer gap under the support of the raised dots.

3. The carbon fiber composite mesh structure as described in claim 2, characterized in that, The FRP warp strips of adjacent warp layers are fused together as one unit through the protrusions; the FRP weft strips of adjacent weft layers are fused together as one unit through the protrusions.

4. The carbon fiber composite mesh structure as described in claim 1, characterized in that, Both the FRP warp and the FRP weft are pultruded narrow strips with equal cross-sections, and the center of the top surface and / or the center of the bottom surface of the narrow strips with equal cross-sections have supporting ribs; wherein, the FRP warp strips of adjacent warp layers form the first interlayer gap under the support of the supporting ribs, and the FRP weft strips of adjacent weft layers form the second interlayer gap under the support of the supporting ribs.

5. The carbon fiber composite mesh structure as described in claim 4, characterized in that, The FRP warp strips of adjacent warp layers are fused together as one unit through the support ribs; the FRP weft strips of adjacent weft layers are fused together as one unit through the support ribs; the first interlayer gap and the second interlayer gap are both separated into two grooves suitable for the grout to penetrate by the support ribs, and the support ribs are provided with grout passage holes suitable for connecting the grooves on both sides.

6. A reinforcement construction method for carbon fiber composite mesh structures, characterized in that, Includes the following steps: According to the dimensions of the area to be reinforced on the base surface, the carbon fiber composite mesh structure as described in any one of claims 1-5 is cut to obtain a carbon fiber composite mesh sheet; After surface preparation, the carbon fiber composite mesh sheet is fixed to the area to be reinforced. A sealed pressure chamber is constructed around the carbon fiber composite mesh sheet; Grouting material is injected into the sealed pressure chamber, so that the grouting material penetrates and fills each of the first interlayer gaps and each of the second interlayer gaps of the carbon fiber composite mesh sheet and maintains pressure. Remove the sealed pressure chamber and apply a mortar protective layer to the area to be reinforced before the grouting material cures, covering the carbon fiber composite mesh sheet; Properly cure the mortar protective layer until it is fully cured.

7. The reinforcement construction method for the carbon fiber composite mesh structure as described in claim 6, characterized in that, The construction of a sealed pressure chamber around the carbon fiber composite mesh sheet includes: The carbon fiber composite mesh sheet is surrounded by sealing strips to form a wall. A high-strength film is covered on the carbon fiber composite mesh sheet, and the high-strength film is sealed and bonded to the enclosure to form the sealed pressure chamber.

8. The reinforcement construction method for the carbon fiber composite mesh structure as described in claim 7, characterized in that, The enclosure is provided with grouting ports and venting ports that are diagonally distributed relative to the carbon fiber composite mesh sheet.

9. The reinforcement construction method for the carbon fiber composite mesh structure as described in claim 6, characterized in that, The grouting material is a cement-based grouting material or an epoxy grouting material, and the pressure at which the grouting material is injected into the sealed pressure chamber is 0.1~0.3MPa; the mortar protective layer is a polymer mortar.

10. The reinforcement construction method for the carbon fiber composite mesh structure as described in claim 6, characterized in that, The base surface treatment includes: After cleaning, roughen the area of ​​the base surface to be reinforced; Apply an interface agent to the roughened area to be reinforced. Specifically, the sealed pressure chamber is constructed before the interface agent dries, and the grouting material is injected into the sealed pressure chamber.

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