Carbon fiber bundle and carbon fiber cloth composite reinforcing structure and construction method thereof

Abstract

The invention discloses a carbon fiber bundle and carbon fiber cloth composite reinforcing structure and a construction method thereof.The carbon fiber bundle and carbon fiber cloth composite reinforcing structure comprises a carbon fiber cloth base layer which comprises a plurality of transverse cloth strips and longitudinal cloth strips, the multiple longitudinal cloth strips are bonded to the surface of a to-be-reinforced structure and arranged at intervals in the first direction, and the transverse cloth strips and the longitudinal cloth strips are arranged at intervals in the second direction; the transverse cloth strips are bonded to the longitudinal cloth strips and the surface, the transverse cloth strips are arranged at intervals in the second direction, the transverse cloth strips and the longitudinal cloth strips are arranged in a crossed mode, and each transverse cloth strip comprises an overlapping section bonded to the corresponding longitudinal cloth strip and a direct connecting section bonded to the surface; the middle of the carbon fiber bundle is fixedly arranged on the surface, and the two ends of the carbon fiber bundle are bonded to the front face, back to the surface, of the direct connection section; and the carbon fiber cloth protection layer covers the front face of the direct connection section and the carbon fiber bundles, and the two opposite ends of the carbon fiber cloth protection layer extend to the surface and are bonded to the surface. The problem that an adhesive layer of an existing single carbon fiber cloth reinforced concrete structure is prone to cracking and stripping is solved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a composite reinforcement structure of carbon fiber bundles and carbon fiber cloth and its construction method. Background Technology

[0002] In the existing field of building reinforcement, common techniques for reinforcing the bottom of concrete slabs or beams include cross-section enlargement, steel plate bonding, and carbon fiber reinforcement. Cross-section enlargement has drawbacks such as reduced building clearance, long wet work time, and increased structural weight. While steel plate bonding has a smaller impact on building clearance, its applicability is limited, it requires long end anchorage lengths, and necessitates fire and rust prevention measures. Single carbon fiber reinforcement, although it does not affect building clearance and is convenient for on-site construction, is prone to cracking and peeling of the bonding layer. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, a composite reinforcement structure of carbon fiber bundles and carbon fiber cloth and its construction method are provided to solve the problem of easy cracking and peeling of the bonding layer in existing single carbon fiber cloth reinforced concrete structures.

[0004] To achieve the above objectives, a composite reinforcement structure of carbon fiber bundles and carbon fiber cloth is provided, comprising:

[0005] The carbon fiber cloth base layer includes multiple transverse and longitudinal strips. The multiple longitudinal strips are bonded to the surface of the structure to be reinforced. The multiple longitudinal strips are spaced apart along a first direction. The multiple transverse strips are bonded to the multiple longitudinal strips and the surface. The multiple transverse strips are spaced apart along a second direction. The transverse strips intersect with the longitudinal strips. The transverse strips include overlapping sections bonded to the longitudinal strips and straight sections bonded to the surface.

[0006] A carbon fiber bundle, wherein the middle part of the carbon fiber bundle is fixed to the surface, and the two ends of the carbon fiber bundle are bonded to the front side of the straight connection segment facing away from the surface.

[0007] A carbon fiber protective layer is provided on the front side of the direct connection section and the carbon fiber bundle, and the opposite ends of the carbon fiber protective layer extend to the surface and are bonded to the surface.

[0008] Furthermore, the surface-embedded anchor rod is disposed on one side of the front of the transverse fabric strip. One end of the anchor rod has a through hole. One end of the carbon fiber bundle is bonded to the other side of the front of the direct connection section. The middle part of the carbon fiber bundle passes through the through hole. The other end of the carbon fiber bundle is rotated and bonded to the other side of the front of the transverse fabric strip.

[0009] Furthermore, each of the direct-connect segments has at least two carbon fiber bundles arranged in opposite directions on its front side.

[0010] Furthermore, the ends of the carbon fiber bundles are dispersedly bonded to the front side of the direct connection segment.

[0011] Furthermore, the ends of the carbon fiber bundles are dispersed in a fan shape.

[0012] Furthermore, the anchor bolt includes:

[0013] An anchor bolt body, wherein the anchor bolt body is embedded in the structure to be reinforced;

[0014] A connector is detachably connected to one end of the anchor bolt body, and the connector has the through hole.

[0015] Furthermore, one end of the connector has a threaded hole, and one end of the anchor body is coaxially connected to a threaded rod, which is screwed into the threaded hole.

[0016] This invention provides a construction method for a composite reinforcement structure of carbon fiber bundles and carbon fiber cloth, comprising the following steps:

[0017] Multiple longitudinal strips of fabric are bonded to the surface of the structure to be reinforced, and the multiple longitudinal strips of fabric are spaced apart along a first direction.

[0018] Multiple transverse strips are bonded to the surfaces of multiple longitudinal strips and the structure to be reinforced to form a carbon fiber cloth base layer. The multiple transverse strips are spaced apart along the second direction and are intersected with the longitudinal strips.

[0019] The middle part of the carbon fiber bundle is fixed to the surface of the structure to be reinforced, and the two ends of the carbon fiber bundle are bonded to the front of the straight section of the transverse cloth strip, which faces away from the structure to be reinforced.

[0020] Multiple carbon fiber protective layers are respectively applied to the front of multiple straight sections of the transverse strip and the carbon fiber bundle, with the opposite ends of the carbon fiber protective layers extending to the surface of the structure to be reinforced and bonded to the surface of the structure to be reinforced.

[0021] The beneficial effects of this invention are as follows: The carbon fiber bundle and carbon fiber cloth composite reinforcement structure innovatively employs both carbon fiber bundles and carbon fiber cloth for composite reinforcement, resulting in a stronger connection between the carbon fiber bundle-carbon fiber cloth composite and the original concrete structure. This allows for shared stress distribution, effectively reducing the risk of adhesive layer cracking and peeling that occurs with single carbon fiber cloth reinforcement. It also improves the durability and ductility of carbon fiber reinforced concrete structures and solves the problem of insufficient anchorage length at the ends of the carbon fiber cloth often due to site limitations in practical engineering. This carbon fiber bundle and carbon fiber cloth composite reinforcement structure ensures building clearance, facilitates convenient and quick on-site construction, and is particularly suitable for reinforcing large-area concrete slab or beam bottoms, providing a completely new solution for engineering reinforcement. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the composite reinforcement structure of carbon fiber bundles and carbon fiber cloth according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a carbon fiber bundle according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the anchor rod according to an embodiment of the present invention.

[0026] Figures 4 to 6 This is a schematic diagram illustrating the construction steps of a carbon fiber bundle and carbon fiber cloth composite reinforcement structure according to an embodiment of the present invention.

[0027] Figure label:

[0028] Horizontal strip 11, overlapping section 111, straight connection section 112, longitudinal strip 12;

[0029] 2. Carbon fiber bundle, 21. Anchor bolt, 210. Perforation, 211. Anchor bolt body, 212.

[0030] Carbon fiber cloth protective layer 3;

[0031] Structure 4 to be reinforced. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Reference Figures 1 to 6 As shown, the present invention provides a composite reinforcement structure of carbon fiber bundle and carbon fiber cloth, including: a carbon fiber cloth base layer, a carbon fiber bundle 2, and a carbon fiber cloth protective layer 3.

[0035] In this embodiment, the carbon fiber fabric base layer includes transverse strips 11 and longitudinal strips 12. There are multiple transverse strips 11 and multiple longitudinal strips 12. Both the transverse strips 11 and the longitudinal strips 12 are carbon fiber strips.

[0036] Specifically, multiple longitudinal fabric strips 12 are bonded to the surface of the structure 4 to be reinforced. The multiple longitudinal fabric strips 12 are spaced apart along a first direction. Multiple transverse fabric strips 11 are bonded to the multiple longitudinal fabric strips 12 and the surface. The multiple transverse fabric strips 11 are spaced apart along a second direction. The transverse fabric strips 11 intersect with the longitudinal fabric strips 12. In a preferred embodiment, when the structure to be reinforced is a beam, the longitudinal fabric strips are arranged along the length of the beam to be reinforced, in order to bear the tensile force at the bottom of the beam.

[0037] Multiple transverse fabric strips 11 are spaced apart. Simultaneously, multiple longitudinal fabric strips 12 are spaced apart. Each transverse fabric strip 11 includes an overlapping section 111 and a straight connecting section 112. The overlapping section 111 of the transverse fabric strip 11 is bonded to the longitudinal fabric strip 12, while the straight connecting section 112 of the transverse fabric strip 11 is bonded to the surface of the structure 4 to be reinforced.

[0038] The middle part of the carbon fiber bundle 2 is fixed to the surface. The two ends of the carbon fiber bundle 2 are bonded to the front of the surface of the direct connection section 112 facing away from the structure 4 to be reinforced.

[0039] A carbon fiber protective layer 3 is applied to the front side of the direct connection section 112 and the carbon fiber bundle 2. The opposite ends of the carbon fiber protective layer 3 extend to and are bonded to the surface. There are multiple carbon fiber protective layers 3. The number of carbon fiber protective layers 3 corresponds to the number of direct connection sections 112 of the transverse fabric strip 11.

[0040] Combination Figure 2 and Figure 3 As shown, anchor rods 21 are implanted into the surface of the structure 4 to be reinforced. Anchor rods 21 are positioned on one side of the front of the transverse fabric strip 11. One end of the anchor rod 21 has a through hole 210. One end of the carbon fiber bundle 2 is bonded to the other side of the front of the straight connecting section 112. The middle portion of the carbon fiber bundle 2 passes through the through hole 210. The other end of the carbon fiber bundle 2 is rotated and bonded to the other side of the front of the transverse fabric strip 11.

[0041] See Figure 1As shown, each direct connection segment 112 has at least two carbon fiber bundles 2 arranged in opposite directions on its front side.

[0042] See Figure 1 and Figure 2 As shown, the ends of the carbon fiber bundle 2 are dispersedly bonded to the front side of the direct connection section 112. The ends of the carbon fiber bundle 2 are dispersed in a fan shape.

[0043] Continue to combine Figure 3 As shown, the anchor bolt 21 includes: the anchor bolt body 211 and the connector 212.

[0044] Anchor bolt body 211 is embedded in the structure 4 to be reinforced. Connector 212 is detachably connected to one end of anchor bolt body 211. Connector 212 has a through hole 210.

[0045] In a preferred embodiment, one end of the connector 212 has a threaded hole. One end of the anchor body 211 is coaxially connected to a threaded rod. The threaded rod is screwed into the threaded hole.

[0046] See Figures 4 to 6 As shown, the present invention provides a construction method for a composite reinforcement structure of carbon fiber bundles and carbon fiber cloth, comprising the following steps:

[0047] S1, Combination Figure 4 Multiple longitudinal strips 12 are bonded to the surface of the structure 4 to be reinforced, and the multiple longitudinal strips 12 are spaced apart along the first direction.

[0048] Preparations before reinforcement:

[0049] 1) Grassroots handling.

[0050] Repair cracks on the concrete surface of the structure to be reinforced and grind it smooth, remove laitance, oil stains, dust and surface metal objects, etc., to expose the aggregate.

[0051] 2) Laying out and positioning.

[0052] On-site layout was conducted, and the locations for attaching carbon fiber cloth and fixing anchor rods were marked on the concrete surface.

[0053] 3) Drilling.

[0054] Based on the anchor bolt fixing position and insertion depth, holes are drilled in the concrete surface using an electric drill and then cleaned.

[0055] When bonding longitudinal strips of fabric, the following steps are included:

[0056] 1) Adhesive mixing ratio.

[0057] Prepare and mix the adhesive according to the technical specifications on the adhesive card, using an appropriate amount each time, and ensure that the adhesive is used up within the specified effective time.

[0058] 2) Apply the first coat of adhesive.

[0059] According to the marked positions of the carbon fiber cloth (longitudinal strips), apply the prepared adhesive to the concrete surface using a roller brush.

[0060] 3) Attach carbon fiber cloth.

[0061] After the adhesive is applied, immediately attach the carbon fiber cloth and press it down with a rigid plastic plate to allow the adhesive to seep out and ensure a firm bond.

[0062] 4) Apply a second coat of adhesive.

[0063] Apply adhesive again to the surface where the carbon fiber cloth has already been pasted.

[0064] S2, Combination Figure 4 Multiple transverse strips 11 are bonded to the surfaces of multiple longitudinal strips 12 and the structure 4 to be reinforced to form a carbon fiber cloth base layer. The multiple transverse strips 11 are spaced apart along the second direction, and the transverse strips 11 and the longitudinal strips 12 are arranged to cross each other.

[0065] For the bonding steps of the horizontal strips, please refer to the bonding steps of the vertical strips.

[0066] The carbon fiber cloth base layer adopts a single-layer bidirectional arrangement, in which the width b1 of the longitudinal cloth strip is 300mm and the spacing s1 is 150mm; the width b2 of the transverse cloth strip is 300mm and the spacing s2 is 300mm.

[0067] S3, Combination Figure 5 The middle part of the carbon fiber bundle 2 is fixed to the surface of the structure to be reinforced 4, and the two ends of the carbon fiber bundle 2 are bonded to the front of the straight section 112 of the transverse cloth strip 11 facing away from the structure to be reinforced 4.

[0068] Anchor bolts are implanted by drilling holes in the surface of the structure to be reinforced 4. The ends of the carbon fiber bundles are dispersed and pasted onto the transverse cloth strips. The middle part of the carbon fiber bundle passes through the perforation of the anchor bolt connector and the other end of the carbon fiber bundle is rotated to the other side of the front of the direct connection section.

[0069] The anchor bolts have the following dimensions: d1 = 16mm, d2 = 8mm, h1 = 310mm, h2 = 10mm, and h3 = 10mm. Anchor bolts are installed and fixed to the existing concrete structure using anchoring adhesive.

[0070] After the anchor bolt is installed, carbon fiber bundles are passed through the holes in the anchor bolt and evenly distributed. The carbon fiber bundles are then bonded to the front side of the straight section of the transverse strip using adhesive.

[0071] S4, Combination Figure 6Multiple carbon fiber protective layers 3 are respectively applied to the front of multiple straight sections 112 of the transverse strip 11 and the carbon fiber bundle 2. The opposite ends of the carbon fiber protective layers 3 extend to the surface of the structure to be reinforced 4 and are bonded to the surface of the structure to be reinforced 4.

[0072] Within the coverage area of ​​the carbon fiber bundle, carbon fiber cloth is bonded again to cover the carbon fiber bundle to protect it.

[0073] The carbon fiber bundle and carbon fiber cloth composite reinforcement structure of this invention innovatively uses two materials, carbon fiber bundles and carbon fiber cloth, for composite reinforcement. This results in a stronger connection between the carbon fiber bundle-carbon fiber cloth composite and the original concrete structure, allowing them to share the load. This effectively reduces the risk of adhesive layer cracking and peeling that occurs with single carbon fiber cloth reinforcement, improving the durability and ductility of carbon fiber reinforced concrete structures. It also solves the problem of insufficient anchorage length at the ends of the carbon fiber cloth, often due to site limitations in practical engineering. This carbon fiber bundle and carbon fiber cloth composite reinforcement structure ensures building clearance, facilitates convenient and quick on-site construction, and is particularly suitable for reinforcing large-area concrete slabs or beam bottoms, providing a completely new solution for engineering reinforcement.

[0074] The carbon fiber bundle and carbon fiber cloth composite reinforcement structure of this invention uses anchor rods to fix the carbon fiber bundles to the original concrete structure. The anchor rod consists of two parts: an anchor rod body and a connector. The anchor rod body is implanted into the original concrete structure using a rebar anchoring method, achieving a firm connection with the concrete structure. The connector at the other end of the anchor rod body is used to connect and fix the carbon fiber bundles. The carbon fiber bundles pass through the connector and are bonded to the carbon fiber cloth with adhesive. The anchor rod body and the connector are connected by threaded screws.

[0075] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A composite reinforcement structure of carbon fiber bundles and carbon fiber cloth, characterized in that, include: The carbon fiber cloth base layer includes multiple transverse and longitudinal strips. The multiple longitudinal strips are bonded to the surface of the structure to be reinforced. The multiple longitudinal strips are spaced apart along a first direction. The multiple transverse strips are bonded to the multiple longitudinal strips and the surface. The multiple transverse strips are spaced apart along a second direction. The transverse strips intersect with the longitudinal strips. The transverse strips include overlapping sections bonded to the longitudinal strips and straight sections bonded to the surface. A carbon fiber bundle, wherein the middle part of the carbon fiber bundle is fixed to the surface, and the two ends of the carbon fiber bundle are bonded to the front side of the straight connection segment facing away from the surface. A carbon fiber protective layer is provided on the front side of the direct connection section and the carbon fiber bundle, and the opposite ends of the carbon fiber protective layer extend to the surface and are bonded to the surface.

2. The composite reinforcement structure of carbon fiber bundles and carbon fiber cloth according to claim 1, characterized in that, The surface-embedded anchor is located on one side of the front of the transverse fabric strip. One end of the anchor has a through hole. One end of the carbon fiber bundle is bonded to the other side of the front of the straight connection section. The middle part of the carbon fiber bundle passes through the through hole. The other end of the carbon fiber bundle is rotated and bonded to the other side of the front of the transverse fabric strip.

3. The composite reinforcement structure of carbon fiber bundles and carbon fiber cloth according to claim 2, characterized in that, Each of the direct-connect segments has at least two carbon fiber bundles arranged in opposite directions on its front side.

4. The composite reinforcement structure of carbon fiber bundles and carbon fiber cloth according to claim 2, characterized in that, The ends of the carbon fiber bundles are dispersedly bonded to the front side of the direct connection segment.

5. The composite reinforcement structure of carbon fiber bundles and carbon fiber cloth according to claim 4, characterized in that, The ends of the carbon fiber bundles are fan-shaped.

6. The composite reinforcement structure of carbon fiber bundles and carbon fiber cloth according to claim 2, characterized in that, The anchor bolt includes: An anchor bolt body, wherein the anchor bolt body is embedded in the structure to be reinforced; A connector is detachably connected to one end of the anchor bolt body, and the connector has the through hole.

7. The composite reinforcement structure of carbon fiber bundles and carbon fiber cloth according to claim 6, characterized in that, One end of the connector has a threaded hole, and one end of the anchor body is coaxially connected to a threaded rod, which is screwed into the threaded hole.

8. A construction method for a composite reinforcement structure of carbon fiber bundles and carbon fiber cloth as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Multiple longitudinal strips of fabric are bonded to the surface of the structure to be reinforced, and the multiple longitudinal strips of fabric are spaced apart along a first direction. Multiple transverse strips are bonded to the surfaces of multiple longitudinal strips and the structure to be reinforced to form a carbon fiber cloth base layer. The multiple transverse strips are spaced apart along the second direction and are intersected with the longitudinal strips. The middle part of the carbon fiber bundle is fixed to the surface of the structure to be reinforced, and the two ends of the carbon fiber bundle are bonded to the front of the straight section of the transverse cloth strip, which faces away from the structure to be reinforced. Multiple carbon fiber protective layers are respectively applied to the front of multiple straight sections of the transverse strip and the carbon fiber bundle, with the opposite ends of the carbon fiber protective layers extending to the surface of the structure to be reinforced and bonded to the surface of the structure to be reinforced.

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