Quick connecting device and connecting method for FRP tendon based on light-cured prepreg

Abstract

The application relates to the technical field of fiber reinforced composite material (FRP) processing and connecting, and discloses a FRP rod quick connecting device and a connecting method based on photocuring prepreg, which comprises a fixing component and an illumination component, the fixing component comprises a fixing frame and two cover plates, two positioning grooves for placing FRP rods are arranged on the fixing frame, and the extension directions of the two positioning grooves are the same; the two cover plates are connected with the fixing frame; the two cover plates are respectively covered on the two positioning grooves and are used for tightly abutting two FRP rods to be connected; the illumination component is sleeved at the connecting position of the two FRP rods and is used for curing the photocuring prepreg wound on the FRP rods. The FRP rods are positioned and pre-tightened first, then the photocuring prepreg is wound, and finally the connecting position is quickly cured, so that the connecting quality is improved, and the curing speed and the curing effect are improved.

Description

Technical Field

[0001] This invention relates to the field of fiber reinforced composite (FRP) processing and joining technology, and in particular to a rapid joining device and method for FRP bars based on photocurable prepreg. Background Technology

[0002] Fiber-reinforced polymer (FRP) composites are widely used in civil engineering, marine engineering, and bridge structures due to their excellent properties such as lightweight, high strength, and corrosion resistance. In practical engineering, the length of FRP bars is often limited by transportation and production processes, requiring reliable on-site connections to ensure the overall mechanical performance of the structure. Traditional connection methods mainly include lap splicing and sleeve splicing. Lap splicing weakens the overall bond between the FRP bar and concrete, significantly increases the lap length, and is also highly uncertain and complex to design. Sleeve splicing has disadvantages mainly in that it is subject to the bonding medium, has a long curing time, is highly sensitive to the environment, has uncertain long-term performance, and is complex to operate. Therefore, a construction method using resin prepreg for winding connections has emerged in the market.

[0003] However, currently, due to the limitations of the resin used, the construction method of winding prepreg requires a long curing time. Basic curing at room temperature generally takes 24 hours, and reaching peak strength takes approximately 3-7 days. Furthermore, during butt joint construction, it is difficult to maintain coaxial alignment of the FRP bars for extended periods, and it is also inconvenient to apply preload for prolonged periods. Therefore, existing FRP bar connection methods suffer from unstable connection quality, slow construction speed, and insufficient adaptability.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a rapid connection device and method for FRP bars based on photocurable prepreg, which aims to solve the problems of unstable connection quality, slow curing speed and poor curing effect in the existing FRP bar connection construction process.

[0006] The technical solution of the present invention is as follows: A quick-connection device for FRP bars based on photocurable prepreg includes a fixing component and a light-illuminating component, wherein the fixing component includes: A fixed frame is provided, which has two positioning grooves for placing FRP bars, and the two positioning grooves extend in the same direction. Both cover plates are connected to the fixed frame; the two cover plates respectively cover the two positioning grooves to abut against the two FRP ribs to be connected. The light-emitting component is sleeved at the connection between the two FRP ribs and is used to cure the photocurable prepreg wrapped on the FRP ribs.

[0007] The aforementioned FRP rebar quick connection device based on photocurable prepreg, wherein the fixing frame includes: Base; A support rod is vertically mounted on the base; at least four support rods are provided, and the at least four support rods are arranged in a rectangular array on the base. Both clamping beams are connected to the support rod; the two clamping beams are flush and spaced apart above the base; The positioning groove is formed on the clamping beam; the cover plate is detachably connected to the clamping beam.

[0008] The aforementioned quick connection device for FRP ribs based on photocurable prepreg, wherein the bottom end of the support rod is detachably connected to the base, and the top end of the support rod is detachably connected to the clamping beam.

[0009] The aforementioned FRP rebar quick connection device based on photocurable prepreg includes a fixing frame that further comprises a reinforcing beam and a reinforcing rod. The reinforcing beam is parallel to the base and is positioned between two adjacent supporting rods. Both ends of the reinforcing beam are provided with sleeve holes for inserting the supporting rods. A groove is formed in the middle of the reinforcing beam. The reinforcing beams are provided in at least two parts, and the two ends of the reinforcing rods are respectively attached to the grooves on the two reinforcing beams.

[0010] The aforementioned FRP rebar quick connection device based on photocurable prepreg includes a light-emitting component comprising a lamp tube and two clamping structures disposed at both ends of the lamp tube. The clamping structures have clamping holes for inserting FRP rebars, and the lamp tube is used to emit ultraviolet light to the connection position of the FRP rebars.

[0011] The aforementioned FRP rib quick connection device based on photocurable prepreg includes a lamp tube comprising a cylinder and several light-emitting strips. The cylinder is hollow, and the several light-emitting strips are arranged circumferentially on the inner wall of the cylinder.

[0012] The aforementioned FRP rib quick connection device based on photocurable prepreg, wherein the clamping structure is detachably connected to the lamp tube.

[0013] The aforementioned FRP rib quick connection device based on photocurable prepreg, wherein the clamping structure includes two semi-circular clamping blocks, the two clamping blocks being arranged opposite to each other; The center of the clamping block is provided with an arc-shaped groove, and the two arc-shaped grooves on the two clamping blocks are combined to form the clamping hole.

[0014] The aforementioned FRP rib quick connection device based on photocurable prepreg includes a positioning groove that is a V-shaped groove; a fixing groove is formed on the surface of the cover plate facing the fixing frame; when the cover plate is connected to the fixing frame, the fixing groove is directly opposite the positioning groove; and the fixing groove is an inverted V-shaped groove.

[0015] This application also discloses a connection method for a quick-connect device for FRP bars based on photocurable prepreg, applicable to any of the above-described quick-connect devices for FRP bars based on photocurable prepreg; wherein, it includes: Assemble and fix the frame based on the specifications of the FRP ribs to be processed; Cut the two FRP bars to be connected symmetrically and place them in the two positioning slots on the fixed frame respectively. Adjust them so that the ends of the two FRP bars are facing each other and fit together. Cover the plate and apply glue to the contact position. Four to eight layers of UV-cured prepreg are wound around the connection points of the two FRP ribs to form a pre-tightened connector; wherein the pre-tightening force on the UV-cured prepreg is 0.5-2N; The light-emitting component is installed onto the pre-tightening connector, and the light-curing prepreg is cured to obtain the FRP rib connector; wherein the curing time is 25-35 minutes.

[0016] Compared with the prior art, the embodiments of the present invention have the following advantages: The FRP (Flat Reinforced Plastic) rebar quick connection device disclosed in this invention constructs a fixed frame to support two FRP rebars. The two FRP rebars are placed sequentially in two positioning grooves arranged in the same direction and limited by two cover plates, ensuring accurate alignment and stability. This facilitates the wrapping of UV-cured prepreg at the connection point of the two FRP rebars, achieving initial connection and pre-tightening. Finally, a light-curing component is fitted onto the FRP rebars to rapidly cure the UV-cured prepreg, completing the connection operation. During operation, the fixed component improves the stability of the two FRP rebars, maintaining coaxial alignment and reducing misalignment and offset issues. It also avoids connection failure caused by eccentric force during the wrapping operation, improving connection quality, increasing the interfacial bonding strength after curing, ensuring safety and reliability during the wrapping and curing process, and enhancing curing speed and effect. This improves the applicability of UV-curing construction methods. Attached Figure Description

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

[0018] Figure 1 This is a front view of a rapid connection device for FRP bars based on photocurable prepreg according to an embodiment of the present invention; Figure 2 This is a left view of a quick-connect device for FRP bars based on photocurable prepreg in one embodiment of the present invention; Figure 3 This is a top view of a rapid connection device for FRP bars based on photocurable prepreg in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the clamping beam in one embodiment of the present invention; Figure 5 This is a schematic diagram of the cover plate in one embodiment of the present invention; Figure 6 This is a front view of a rapid connection device for FRP bars based on photocurable prepreg according to another embodiment of the present invention; Figure 7 This is a left view of a quick-connect device for FRP bars based on photocurable prepreg according to another embodiment of the present invention; Figure 8 This is a top view of a rapid connection device for FRP bars based on photocurable prepreg according to another embodiment of the present invention; Figure 9 This is a schematic diagram of the reinforced crossbeam in one embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the lighting component and the FRP rib in the connected state according to an embodiment of the present invention; Figure 11 This is a radial cross-sectional view of the lighting component and the FRP rib in a connected state according to an embodiment of the present invention; Figure 12 This is a schematic diagram of the clamping block in one embodiment of the present invention; Figure 13 This is a top view of the fixing component and FRP rib in the assembled state according to an embodiment of the present invention; Figure 14 This is a top view of the fixing component, FRP rib, and photocurable prepreg in an assembled state according to an embodiment of the present invention; Figure 15 This is a top view of the fixing component, FRP rib, light-cured prepreg, and light-irradiation component in an assembled state according to an embodiment of the present invention; Figure 16 This is a schematic diagram of the structure of specimen a manufactured according to the connection method of the FRP bar quick connection device in one embodiment of the present invention; Figure 17 This is a schematic diagram of the structure of specimen b, which was fabricated according to the connection method of the FRP bar quick connection device in one embodiment of the present invention. Figure 18 This is a schematic diagram of the structure of specimen c manufactured according to the connection method of the FRP bar quick connection device in one embodiment of the present invention; Figure 19 This is a schematic diagram of the structure of specimen d manufactured according to the connection method of the FRP bar quick connection device in one embodiment of the present invention; Figure 20 This is a material property curve diagram of tensile tests performed on specimens a, b, c, d and a control specimen in one embodiment of the present invention. Figure 21 This is a flowchart of a connection method for a rapid connection device for FRP bars based on photocurable prepreg in one embodiment of the present invention.

[0019] Among them, 10, fixing component; 11, fixing frame; 111, positioning groove; 112, base; 113, support rod; 114, clamping crossbeam; 115, reinforcing crossbeam; 1151, sleeve hole; 1152, groove; 116, reinforcing rod; 12, cover plate; 121, fixing groove; 20, lighting component; 21, lamp tube; 211, cylinder body; 212, light-emitting light strip; 22, clamping structure; 221, clamping block; 2211, arc groove; 30, FRP rib; 40, light-cured prepreg. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the accompanying drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that may occur during manufacturing. The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all contents, operations, or steps, nor do they necessarily need to be performed in the order described. For example, some operations or steps may be broken down, combined, or partially merged, so the actual order of execution may change depending on the specific circumstances.

[0022] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0023] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0024] For ease of description, spatial relational terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relational terms are intended to encompass not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways, and the spatial relational terms used herein will be interpreted accordingly.

[0025] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0026] Compared to traditional thermosetting materials, the core advantage of UV-cured prepregs is that they can cure quickly at room temperature. Under sufficient ultraviolet light, they can be cured and put into use in just about 30 minutes, offering advantages such as high efficiency, low equipment investment, and convenient on-site construction.

[0027] The construction technology of photocuring FRP reinforcement bars is an advanced bonding process that uses ultraviolet or visible light to irradiate a photosensitive resin system, causing it to cross-link and cure in a very short time, thereby achieving efficient bonding between the fiber reinforcement material and the reinforcement matrix. This technology fully utilizes the characteristics of photocuring resins, such as fast reaction speed, energy saving, environmental protection, and strong controllability, and is particularly suitable for engineering scenarios with tight schedules, limited on-site energy, or the need to quickly restore the structural load-bearing capacity. The material system selected during construction mainly includes a photosensitive resin matrix represented by ultraviolet-cured vinyl ester resin, appropriately layered E-glass fiber reinforcement cloth, and a photoinitiator system of a specific concentration (usually 0.1%~2.0%). Because photocuring resins emit very few volatile organic compounds, it is more in line with the requirements of green construction.

[0028] However, currently there is a lack of construction equipment specifically designed for the rapid connection of FRP bars during construction. The joint position of the FRP bars to be connected is prone to misalignment during construction, resulting in insufficient light exposure during curing, which affects the curing speed and quality, and consequently affects the stability of the connected structure, leading to poor connection results.

[0029] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 13 , Figure 14 and Figure 15 In one embodiment of this invention application, a quick connection device for FRP ribs based on photocurable prepreg is disclosed, including a fixing component 10 and a light-irradiating component 20. The fixing component 10 includes a fixing frame 11 and two cover plates 12. The fixing frame 11 has two positioning grooves 111 for placing FRP ribs 30, and the two positioning grooves 111 extend in the same direction. The two cover plates 12 are connected to the fixing frame 11. The two cover plates 12 respectively cover the two positioning grooves 111 to abut against the two FRP ribs 30 to be connected. The light-irradiating component 20 is sleeved at the connection point of the two FRP ribs 30 to cure the photocurable prepreg 40 wound on the FRP ribs 30.

[0030] The FRP rib quick connection device disclosed in this embodiment constructs a fixed frame 11 to support two FRP ribs 30. The two FRP ribs 30 are placed sequentially in two positioning grooves 111 arranged in the same direction and limited by two cover plates 12, so that they can be accurately aligned and remain stable, so as to wrap the light-curing prepreg 40 at the connection point of the two FRP ribs 30 to achieve preliminary connection and pre-tightening. Finally, the light-irradiating component 20 is put on the FRP rib 30 to quickly cure the light-curing prepreg 40 and complete the connection operation.

[0031] As can be seen, the FRP bar quick connection device disclosed in this embodiment improves the stability of the two FRP bars 30 during construction by fixing the component 10, maintaining coaxial alignment, reducing misalignment and offset, and avoiding connection failure caused by eccentric force during the winding operation. This improves the connection quality, increases the interface bonding strength after curing, ensures the safety and reliability of the winding and curing process, and improves the curing speed and curing effect, which is conducive to improving the applicability of the light curing construction method.

[0032] like Figure 4 and Figure 5 As shown, in another embodiment of this application, the positioning groove 111 is disclosed as a V-shaped groove; a fixing groove 121 is formed on the surface of the cover plate 12 facing the fixing frame 11; when the cover plate 12 is connected to the fixing frame 11, the fixing groove 121 is directly opposite the positioning groove 111; and the fixing groove 121 is an inverted V-shaped groove.

[0033] In the connection construction of the FRP reinforcement 30 disclosed in this embodiment, the coaxiality requirement of the two FRP reinforcements 30 is high. Therefore, two positioning grooves 111 are set as V-shaped grooves. When the FRP reinforcement 30 is placed in the V-shaped groove, it is guided by the side walls on both sides and can be kept in a centered position. Since the two positioning grooves 111 extend in the same straight line direction, it can be ensured that the two FRP reinforcements 30 placed in the two positioning grooves 111 also extend in the same straight line direction, which improves the coaxiality at the connection position and helps to maintain stability, avoiding the displacement of the FRP reinforcement 30 in the positioning grooves 111.

[0034] Specifically, in this embodiment, the cover plate 12 covers the positioning groove 111 and is provided with a fixing groove 121, which can further limit the FRP rib 30. The lower half of the FRP rib 30 is placed in the positioning groove 111, and the positioning groove 111 achieves the limiting effect; the upper half of the FRP rib 30 protrudes out of the positioning groove 111 and abuts against the fixing groove 121. The fixing groove 121 is an inverted V-shaped groove, so it can also achieve the effect of centering and limiting. That is to say, the positioning groove 111 and the fixing groove 121 cooperate vertically to limit the FRP rib 30, so that the two FRP ribs 30 are kept in a coaxial and centered state, which facilitates subsequent winding and light curing operations.

[0035] Specifically, the cover plate 12 disclosed in this embodiment can be connected to the fixed frame 11 by means of screwing or snap-fitting to improve the stability in the connection state, accurately limit the FRP ribs 30, and ensure that the two FRP ribs 30 to be connected do not slide relative to each other during the winding process.

[0036] For example Figure 1 , Figure 2 and Figure 3As shown, in another embodiment of this application, the fixed frame 11 includes a base 112, a support rod 113, and two clamping beams 114. The support rod 113 is vertically disposed on the base 112. At least four support rods 113 are provided, and the at least four support rods 113 are arranged in a rectangular array on the base 112. The two clamping beams 114 are connected to the support rods 113. The two clamping beams 114 are flush and spaced apart above the base 112. The positioning groove 111 is formed on the clamping beam 114. The cover plate 12 is detachably connected to the clamping beam 114.

[0037] The fixed frame 11 disclosed in this embodiment is generally cubic in shape, providing structural stability. The base 112 can be placed on a table or the ground to support the support rods 113 and the clamping beams 114. Specifically, in one embodiment, the base 112 can be formed by interlacing horizontal and vertical rods to create a rectangular structure for stability. Four support rods 113 can be installed at the corners of the base 112, and adjacent support rods 113 form a group, jointly supporting a clamping beam 114. Overall, the two clamping beams 114 can be arranged in parallel.

[0038] In other embodiments of this example, reinforcing ribs may be provided on the base 112 to increase structural strength; 6, 8, or other support rods 113 may be provided to jointly support a clamping beam 114 with 3 or 4 support rods 113, thereby improving load-bearing capacity and stability. It should be noted that the above embodiments are illustrative examples and not exhaustive. Other base 112 structures and other numbers of support rods 113 may be provided in this embodiment as equivalent replacements for this embodiment, and should also be within the scope of protection of this application.

[0039] In summary, the stable fixed frame 11, consisting of the base 112, support rod 113, and clamping beam 114, can be placed stably on the construction site to support the FRP reinforcement 30. This improves the stability of the connection operation, increases the coaxiality of the FRP reinforcement 30 joints, and makes the end face contact tighter, thus enhancing the connection effect.

[0040] In one embodiment of this invention, the crossbars and longitudinal bars can be connected by bolts, snap-fits, or welding to form a stable base 112. The base 112 and the support rod 113, as well as the support rod 113 and the clamping beam 114, can be connected by welding, snap-fits, or screws to build a stable and non-shaking fixed frame 11.

[0041] Specifically, as another embodiment of this application, the bottom end of the support rod 113 is detachably connected to the base 112, and the top end of the support rod 113 is detachably connected to the clamping beam 114. In this embodiment, the support rod 113 is detachably connected, and the entire fixing frame 11 can be divided into multiple modules to facilitate modular customization, allowing for the installation of support rods 113 of various sizes. Under different construction requirements, different lengths of support rods 113 can be replaced, flexibly adjusting the height of the clamping beam 114, improving the adaptability of the device and making it easier to use. Furthermore, the modular fixing frame 11 is also more convenient for movement and transportation.

[0042] Specifically, both ends of the support rod 113 disclosed in this embodiment can be provided with screw holes to achieve connection by bolts. When replacing, it is only necessary to remove the bolts in the screw holes to disassemble, which is convenient to operate.

[0043] In another embodiment of this invention, the support rod 113 can be configured as a multi-stage adjustment rod or a hydraulic rod, thereby enabling the height of the support rod 113 to be directly adjusted without disassembly, so as to achieve the effect of adjusting the position of the clamping beam 114.

[0044] like Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, in another embodiment of this application, the fixed frame 11 further includes a reinforcing beam 115 and a reinforcing rod 116. The reinforcing beam 115 is parallel to the base 112 and is disposed between two adjacent support rods 113. Both ends of the reinforcing beam 115 are provided with sleeve holes 1151 for inserting the support rods 113. A groove 1152 is formed in the middle of the reinforcing beam 115. At least two reinforcing beams 115 are provided, and both ends of the reinforcing rods 116 respectively overlap the grooves 1152 on the two reinforcing beams 115.

[0045] In this embodiment, the reinforcing beams 115 and reinforcing rods 116 are used to improve the structural strength of the fixed frame 11. When a larger fixed frame 11 is required in the construction site (e.g., the construction height exceeds 1.5 meters), or when the compressive strength requirement of the fixed frame 11 is high, the reinforcing beams 115 are used to connect adjacent support rods 113, making the support rods 113 more stable, reducing swaying, and increasing the compressive strength; the reinforcing rods 116 are used to connect two reinforcing beams 115, making the reinforcing beams 115 more stable, further improving the overall structural stability.

[0046] In addition, the reinforcing beam 115 disclosed in this embodiment is connected to the support rod 113 by a sleeve connection, and the reinforcing rod 116 is connected to the reinforcing beam 115 by an overlapping connection. Therefore, both are detachable connection methods, which have the advantages of being flexible to select and easy to disassemble and assemble. Operators can choose flexibly according to construction needs.

[0047] Specifically, as another embodiment of this application, the fixed frame 11, cover plate 12, reinforcing beam 115, reinforcing rod 116 and other components are disclosed. They can all be made of materials such as aluminum alloy or stainless steel, and have high structural rigidity, strong compressive strength, and good stability and durability.

[0048] like Figure 10 and Figure 11 As shown, in another embodiment of this application, the illumination component 20 is disclosed to include a lamp tube 21 and two clamping structures 22 disposed at both ends of the lamp tube 21. The clamping structures 22 are provided with clamping holes for inserting FRP ribs 30. The lamp tube 21 is used to emit ultraviolet light to the connection position of the FRP ribs 30.

[0049] In this embodiment, two FRP ribs 30 to be connected are respectively connected by two clamping structures 22, so that the light-emitting component 20 is stably fitted on the FRP ribs 30. The lamp tube 21 can be aimed at the connection position of the FRP ribs 30 to illuminate, thereby accelerating the curing of the UV-curable prepreg 40 and improving construction quality and efficiency. The lamp tube 21 disclosed in this embodiment can adopt a ring-shaped or C-shaped structure to surround the UV-curable prepreg 40 for curing illumination.

[0050] like Figure 11 As shown in another embodiment of this application, the lamp tube 21 includes a cylindrical body 211 and several light-emitting strips 212. The cylindrical body 211 is hollow, and the several light-emitting strips are arranged circumferentially on the inner wall of the cylindrical body 211 at intervals. In this embodiment, by emitting ultraviolet light simultaneously from the several light-emitting strips 212, the entire surface of the FRP reinforcement 30 can be covered, allowing for all-round light curing of the photocurable prepreg 40 wrapped around the FRP reinforcement 30, thereby improving the curing effect and curing speed, and further improving construction efficiency. In addition, the main wavelength of the ultraviolet light emitted by the light-emitting strips 212 is 365nm or 395nm, which can be selected according to the type of photoinitiator of the prepreg.

[0051] Specifically, in this embodiment, four light-emitting strips 212 can be provided, with adjacent light-emitting strips 212 spaced 90° apart, and sequentially arranged on the inner wall of the cylinder 211 to achieve all-round coverage of the UV-curable prepreg 40, ensuring that the amount of light received by each part of the UV-curable prepreg 40 is consistent during the curing process. Furthermore, the light-emitting strips 212 disclosed in this embodiment can be controlled by multiple independent circuits to achieve zoned curing, further improving the flexibility of construction.

[0052] Specifically, as another embodiment of this application, the clamping structure 22 is disclosed to be detachably connected to the lamp tube 21. The FRP rib quick-connect device disclosed in this embodiment can be used to connect FRP ribs 30 of various sizes. The lamp tube 21 is designed with a large diameter to cover all sizes of FRP ribs 30, achieving a nested connection. This embodiment can provide multiple clamping structures 22, each with a different diameter clamping hole (e.g., 8mm, 10mm, 12mm, 16mm, etc.). The clamping structure 22 is detachably connected to the lamp tube 21, allowing for replacement of the clamping structure 22 and adjustment of the clamping hole size according to actual working conditions, accommodating different sizes of FRP ribs 30.

[0053] Specifically, in order to accommodate FRP ribs 30 of different sizes, an elastic layer, such as a silicone pad, rubber pad, or sponge pad, can be provided on the side wall of the clamping hole to adapt to the irregular surface of the rib and increase the stability of the clamping.

[0054] Specifically, as another embodiment of this application, it is disclosed that both the cylinder 211 and the clamping structure 22 can be made of plastic materials to achieve lightweighting and facilitate disassembly and assembly. For example, polyvinyl chloride (PVC) material can be used, making full use of its advantages such as light weight, corrosion resistance, high mechanical strength, and low cost.

[0055] Specifically, in this embodiment, the lamp holder 21 and the clamping structure 22 can be connected by a detachable method such as plug-in or magnetic connection, which is simple and convenient to operate and has high construction efficiency. However, the scope of protection of this invention is not limited to this. Other types of connection methods, as long as they can achieve the technical effects disclosed in this application, can be considered as equivalent substitutions for the inventive concept and should also be within the scope of protection of this application.

[0056] like Figure 11 and Figure 12 As shown, in another embodiment of this application, the clamping structure 22 is disclosed to include two semi-circular clamping blocks 221, which are arranged opposite to each other; an arc-shaped groove 2211 is provided at the center of the clamping block 221, and the two arc-shaped grooves 2211 on the two clamping blocks 221 are combined to form the clamping hole.

[0057] The clamping structure 22 disclosed in this embodiment consists of two clamping blocks 221 joined together to facilitate installation onto the FRP rib 30. It can clamp the column FRP rib 30 even after the two FRP ribs 30 have been pre-positioned, facilitating the assembly of the lamp holder 21. Furthermore, this easily disassembled structure makes it more convenient to replace. When it is necessary to adjust the size of the clamping holes to accommodate the FRP rib 30, a suitable model of clamping block 221 can be selected to quickly assemble the clamping structure 22.

[0058] The two clamping blocks 221 disclosed in this embodiment can be connected by mechanical means such as snap-fit ​​or interference fit, or they can be clamped and assembled by electric or pneumatic clamps to control the clamping force and improve the stability of the connection between the clamping structure 22 and the FRP rib 30.

[0059] like Figure 13 , Figure 14 , Figure 15 and Figure 21 As shown, this application also discloses a connection method for a rapid connection device for FRP bars based on photocurable prepreg, applicable to any of the rapid connection devices for FRP bars based on photocurable prepreg as described above; wherein, it includes: Step S10: Assemble the fixing frame 11 based on the specifications of the FRP rib 30 to be processed; Before construction, the support rods 113 on the fixed frame 11 can be selected as needed. After selecting the appropriate size of the support rods 113 and assembling the fixed frame 11, the construction requirements of the FRP bars 30 that need to be processed can be met, thereby increasing the adaptability of the device to accommodate FRP bars 30 of different diameters.

[0060] Step S20: Cut the two FRP bars 30 to be connected symmetrically and place them in the two positioning slots 111 on the fixed frame 11 respectively. Adjust them so that the ends of the two FRP bars 30 are facing each other and fit together. Cover with the cover plate 12 and apply glue to the contact position. like Figure 13 As shown, the ends of the two FRP bars 30 to be connected are symmetrically cut to ensure that the cut surfaces can fit together. Then, they are placed in the two positioning grooves 111 respectively, keeping them coaxial and centered, and glue is applied to the end contact surfaces for initial fixation.

[0061] Step S30: Wrap 4-8 layers of UV-cured prepreg 40 around the connection position of the two FRP ribs 30 to form a pre-tightened connector; wherein the pre-tightening force on the UV-cured prepreg 40 is 0.5-2N; like Figure 14As shown, the UV-cured prepreg 40 is cut to a suitable size. During the winding process, the stability of the fixed frame 11 can be used to apply a certain pre-tightening force to the UV-cured prepreg 40, so that the UV-cured prepreg 40 is tightly attached to the surface of the FRP rib 30, eliminating air bubbles and ensuring the quality of interface bonding.

[0062] Step S40: Install the light-illuminating component 20 onto the pre-tightening connector and cure the light-curing prepreg 40 to obtain the FRP rib connector; wherein the curing time is 25-35 minutes.

[0063] like Figure 15 As shown, the light-irradiating component 20 is connected so that the connection position is within the light-irradiated area. The curing time is determined according to the type and number of winding layers of the UV-curable prepreg 40. The light-irradiating component 20 is activated, using ultraviolet light to penetrate the surface of the prepreg and initiate a photopolymerization reaction in the resin matrix, achieving rapid curing. After curing is complete, the ultraviolet light irradiation is stopped, the FRP reinforcement 30 is removed, and the curing condition of the connection section surface is checked. If the curing is sufficient, the connection is complete.

[0064] The rapid connection method for FRP reinforcing bars 30 disclosed in this embodiment improves the coaxiality at the connection point through pre-alignment, facilitating tight winding of the photocurable prepreg 40, reducing gaps and air bubbles at the connection point, improving connection quality, and increasing the interfacial bonding strength after curing. Furthermore, the photocurable prepreg 40 exhibits reduced twisting deformation during winding, resulting in a smoother outer surface. This allows for more effective light exposure during photocuring, reducing fiber optic obstruction and avoiding incomplete local curing, further enhancing curing speed and effect. Therefore, the overall construction quality and efficiency are improved, contributing to enhanced safety and reliability of the connectors.

[0065] Specifically, in this embodiment, the processed FRP reinforcement connectors can be subjected to subsequent construction or mechanical performance testing, such as... Figure 16 , Figure 17 , Figure 18 and Figure 19 The image shows an FRP (fiberglass reinforced plastic) reinforcement specimen undergoing mechanical property testing. Figure 20 As shown, the control specimens used continuous FRP bars with the same diameter and length as specimens a, b, c, and d. According to the test results, through the application of preload and the guarantee of coaxial alignment, the tensile strength of specimens a, b, c, and d can all reach more than 80% of the strength of the parent material, which meets the requirements of engineering applications.

[0066] In summary, this application discloses a quick-connect device and method for FRP ribs based on photocurable prepreg. The quick-connect device for FRP ribs includes a fixing component 10 and a light-illuminating component 20. The fixing component 10 includes a fixing frame 11 and two cover plates 12. The fixing frame 11 has two positioning grooves 111 for placing FRP ribs 30, and the two positioning grooves 111 extend in the same direction. The two cover plates 12 are connected to the fixing frame 11. The two cover plates 12 respectively cover the two positioning grooves 111 to abut against the two FRP ribs 30 to be connected. The light-illuminating component 20 is sleeved at the connection point of the two FRP ribs 30 to quickly cure the photocurable prepreg 40 wound on the FRP ribs 30. By constructing a fixed frame 11 to support the two FRP bars 30, maintaining coaxial alignment, and reducing misalignment and offset issues, it can also avoid connection failures caused by eccentric force during the winding process, thereby improving connection quality, increasing the bonding strength of the interface after curing, ensuring safety and reliability during the winding and curing process, improving curing speed and curing effect, and enhancing the applicability of the light curing construction method, making it suitable for on-site construction environments such as civil engineering and marine engineering.

[0067] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0068] It should be noted that this invention uses the FRP bar quick connection device and connection method based on photocurable prepreg as an example to introduce the specific structure and working principle of the invention. However, the application of this invention is not limited to the FRP bar quick connection device and connection method based on photocurable prepreg, and can also be applied to the production and use of other similar workpieces.

[0069] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0070] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rapid connection device for FRP bars based on photocurable prepreg, characterized in that, It includes a fixing component and a lighting component, wherein the fixing component includes: A fixed frame is provided, which has two positioning grooves for placing FRP bars, and the two positioning grooves extend in the same direction. Both cover plates are connected to the fixed frame; the two cover plates respectively cover the two positioning grooves to abut against the two FRP ribs to be connected. The light-emitting component is sleeved at the connection between the two FRP ribs and is used to cure the photocurable prepreg wrapped on the FRP ribs.

2. The rapid connection device for FRP bars based on photocurable prepreg according to claim 1, characterized in that, The fixed frame includes: Base; A support rod is vertically mounted on the base; at least four support rods are provided, and the at least four support rods are arranged in a rectangular array on the base. Both clamping beams are connected to the support rod; the two clamping beams are flush and spaced apart above the base; The positioning groove is formed on the clamping beam; the cover plate is detachably connected to the clamping beam.

3. The rapid connection device for FRP bars based on photocurable prepreg according to claim 2, characterized in that, The bottom end of the support rod is detachably connected to the base, and the top end of the support rod is detachably connected to the clamping beam.

4. The rapid connection device for FRP bars based on photocurable prepreg according to claim 2, characterized in that, The fixed frame also includes a reinforcing beam and a reinforcing rod. The reinforcing beam is parallel to the base and is disposed between two adjacent supporting rods. Both ends of the reinforcing beam are provided with sleeve holes for inserting the supporting rods. A groove is formed in the middle of the reinforcing beam. The reinforcing beams are provided in at least two parts, and the two ends of the reinforcing rods are respectively attached to the grooves on the two reinforcing beams.

5. The rapid connection device for FRP bars based on photocurable prepreg according to any one of claims 1 to 4, characterized in that, The illumination component includes a lamp tube and two clamping structures disposed at both ends of the lamp tube. The clamping structures have clamping holes for inserting FRP ribs. The lamp tube is used to emit ultraviolet light to the connection position of the FRP ribs.

6. The rapid connection device for FRP bars based on photocurable prepreg according to claim 5, characterized in that, The lamp tube includes a cylindrical body and several light-emitting strips. The cylindrical body is hollow, and the several light-emitting strips are arranged circumferentially on the inner wall of the cylindrical body.

7. The rapid connection device for FRP bars based on photocurable prepreg according to claim 5, characterized in that, The clamping structure is detachably connected to the lamp tube.

8. The rapid connection device for FRP bars based on photocurable prepreg according to claim 5, characterized in that, The clamping structure includes two semi-circular clamping blocks, which are arranged opposite to each other. The center of the clamping block is provided with an arc-shaped groove, and the two arc-shaped grooves on the two clamping blocks are combined to form the clamping hole.

9. The rapid connection device for FRP bars based on photocurable prepreg according to claim 1, characterized in that, The positioning groove is a V-shaped groove; a fixing groove is formed on the surface of the cover plate facing the fixing frame; when the cover plate is connected to the fixing frame, the fixing groove is directly opposite the positioning groove; and the fixing groove is an inverted V-shaped groove.

10. A connection method for a rapid connection device for FRP bars based on photocurable prepreg, applied to the rapid connection device for FRP bars based on photocurable prepreg as described in any one of claims 1 to 9; characterized in that, include: Assemble and fix the frame based on the specifications of the FRP ribs to be processed; Cut the two FRP bars to be connected symmetrically and place them in the two positioning slots on the fixed frame respectively. Adjust them so that the ends of the two FRP bars are facing each other and fit together. Cover the plate and apply glue to the contact position. Four to eight layers of UV-cured prepreg are wound around the connection point of the two FRP ribs to form a pre-tightened connector; wherein the pre-tightening force on the UV-cured prepreg is 0.5-2N; The light-emitting component is installed onto the pre-tightening connector, and the light-curing prepreg is cured to obtain the FRP rib connector; wherein the curing time is 25-35 minutes.

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