Flexible cloth tendon method and device for 3D printing repair of concrete structure

Abstract

A flexible reinforcement method for 3D-printed repair of concrete structures, belonging to the field of civil engineering, is disclosed. This method involves a 3D-printed concrete flexible reinforcement repair technology and construction device that receives input of the specific repair scenario and characteristics of the component to be repaired. The device designs a repair plan and composite materials, adding corresponding materials to a flexible reinforcement storage unit, a fiber mesh storage unit, and a 3D-printed concrete output pump. Then, it sequentially activates a flexible fiber reinforcement device, a flexible mesh unit, and a 3D-printed concrete composite material flexible reinforcement smoothing device, thereby repairing the concrete structure. The invention also provides a flexible reinforcement device for 3D-printed concrete structure repair. This invention enhances the interlayer continuity and anisotropic toughness of the 3D-printed concrete repair layer, resulting in a denser repair layer that better resists shrinkage-induced deformation and cracking, thus improving the intelligence and effectiveness of concrete repair.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of civil engineering, and particularly relates to repairing existing damaged components using 3D printing concrete composite materials, and more particularly to a flexible distribution method and device for 3D printing repair of concrete structures. BACKGROUND

[0002] Concrete repair refers to the process of treating concrete structures that have damage, defects or performance degradation, so as to restore or partially restore the original function, appearance and structural integrity. With the acceleration of urbanization, a large number of concrete structures are facing aging and damage problems due to years of disrepair. Traditional repair methods are low in efficiency and high in cost, and most of them are not optimized in material design according to the repair purpose, which ultimately leads to a large amount of material waste. 3D printing concrete technology provides a new repair solution with its flexibility, automation and rapid construction characteristics, which can accurately repair damaged parts, reduce material waste and greatly shorten the repair time. Compared with traditional repair methods, 3D printing repair technology can achieve accurate repair of complex structures. Artificial repair is difficult to smoothly carry out in special repair environment and scene and has safety hazards, while 3D printing concrete repair technology can adapt to more working scenarios and reduce dangerous manual operations. In addition, 3D printing concrete repair technology can also reduce construction noise and dust, has little impact on the environment and meets the concept of sustainable development. At the same time, 3D printing concrete repair technology can configure green raw materials for the repair paste, such as using recycled or recycled materials for 3D printing, which improves the recycling rate of resources.

[0003] At present, the technology has the following problems in practical application: the anisotropy of the printing paste makes the repair surface have a large weak mechanical performance area in the vertical direction to the printing direction; and the conventional printing technology cannot guarantee the flatness and density of the repair surface. Therefore, how to design a set of equipment that is simple to operate and can effectively solve the problem of anisotropy of the paste in conventional 3D printing repair and improve the flatness and density of the repair surface has strong engineering practical value.

[0004] At present, there are two methods of artificial coating and mechanical repair for concrete repair technology. CN202120649137.5 discloses a concrete crack repair device, and its repair method is to manually control the repair slurry nozzle to coat and repair different cracks, which highly depends on the operation of the operator on the equipment, cannot adapt to different repair environments and heights, and also cannot avoid the danger of high-altitude and underwater operation in the repair process. CN201721795377.6 discloses an intelligent concrete repair device, which releases the repair agent when the crack is generated by the built-in sensing element. The material used has limitations and cannot use similar cement-based materials that will be hydrated and coagulated. On the other hand, it needs to be widely arranged on the component, which has low economic benefits. CN202210649075.7 discloses a reinforcing bar preparation method for reinforcing concrete structure and a 3D printing system, which injects fluid state reinforcing material into the base material in the uncoagulated state to repair the void defects caused by printing and reinforcing process, and eliminates the voids introduced by other reinforcing technologies. However, due to the anisotropy of 3D printed concrete, the reinforcing bar can only realize single-direction reinforcement and lacks consideration of the load perpendicular to the printing path, which cannot be applied to the repair operation of large-area and low-thickness concrete components. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the present application provides a flexible tendon method and device for 3D printing repair of concrete structure, which is beneficial to precisely control the interface thickness of 3D printed concrete and improve the compactness of the repair layer, and at the same time, improve the toughness and strength of the repair surface in different directions, more effectively resist the influence of self-shrinkage on the performance of the repair layer; it is beneficial to enhance the interlayer continuity and anisotropic toughness of the 3D printed concrete repair layer, and the repair layer is more compact and better resists deformation and cracking caused by shrinkage, and improves the intelligence and effectiveness of concrete repair.

[0006] The technical scheme adopted by the present application to solve its technical problems is:

[0007] A flexible tendon method for 3D printing repair of concrete structure, comprising the following steps:

[0008] S1: According to the specific repair scene, the characteristics of the component to be repaired are extracted and the corresponding repair scheme and composite material design are designed;

[0009] S2: According to the selected tendon distribution requirement, select the appropriate diameter of the fiber wire and the fiber mesh, and install the fiber wire and the fiber mesh roll in the flexible tendon storage and the fiber mesh storage; and place the mixed slurry into the 3D printing concrete output pump;

[0010] S3: using flexible fiber cloth reinforcement device and 3D printing concrete flexible cloth reinforcement repair technology and its construction device output material to complete the cloth paste cloth reinforcement on the repair surface, after the output is completed, the fiber wire is fused and the paste body is finished by using a scraper to complete this output;

[0011] S4: using flexible cloth net unit to arrange fiber grid, after the output is completed, the fiber net is fused and the paste body is finished by using a scraper to complete this output;

[0012] S5: repeating the paste arrangement and cloth reinforcement in S3 and the finishing work in S4 until the 3D printing concrete flexible cloth reinforcement repair platform completes the repair.

[0013] Further, in step S1, the repair scheme and composite material design are calculated by a microcomputer, which is built-in with a repair variable model for calculating the repair scheme and composite material design.

[0014] Still further, in step S2, the fiber wire manufacturing material is any one or a combination of two or more of carbon fiber, steel fiber, polypropylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, hemp fiber, wood pulp fiber, asbestos fiber, polyvinyl alcohol fiber or polyester fiber.

[0015] In step S2, the fiber net manufacturing material is any one or a combination of two or more of carbon fiber, steel fiber, polypropylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, hemp fiber, wood pulp fiber, asbestos fiber, polyvinyl alcohol fiber or polyester fiber.

[0016] In step S2, the paste is any one or a combination of two or more of neat paste, ordinary mortar, alkali-activated mortar and fiber-reinforced mortar.

[0017] Through the above technical solution, different types of fiber wires, fiber nets and pastes can be used to repair different types of structures to be repaired, meeting the repair requirements in different scenarios and conditions.

[0018] Still further, in step S3, the flexible fiber cloth reinforcement device and the 3D printing concrete flexible cloth reinforcement repair technology and its construction device output material along the predetermined track.

[0019] The flexible fiber cloth reinforcement device has a wire guide rail for accurately placing the fiber wire to the designated position; the 3D printing concrete flexible cloth reinforcement repair technology and its construction device has a 3D printing concrete output guide rail for accurately placing the paste to the designated position.

[0020] In step S3, the 3D printed concrete composite flexible reinforcement smoothing device has the function of smoothing the output material. The travel route of the 3D printed concrete composite flexible reinforcement smoothing device should be consistent with the trajectory of the 3D printed concrete flexible reinforcement repair technology and its construction device, so as to avoid the squeezing and pulling of the scraper affecting the distribution of the flexible fiber reinforcement arranged by the flexible fiber reinforcement device.

[0021] Through the above technical solutions, the 3D printed concrete output guide rail of the 3D printed concrete flexible reinforcement repair technology and its construction device can perform fine and accurate repair on the specified location; the guide rail of the flexible fiber reinforcement device can arrange the fiber filaments at the specified position calculated by the microcomputer, and fix and strengthen the original arrangement of the slurry; combined with the scraper, the output material on the repair surface is smoothed, making the output material more uniform and dense.

[0022] In step S4, the flexible mesh unit outputs material along a predetermined track. The flexible mesh unit has a mesh guide rail for accurately placing the fiber mesh at a designated position.

[0023] Through the above technical solution, the mesh guide rail of the flexible mesh unit can be used to perform fine and accurate repair at a specified location; the flexible mesh unit can reinforce the material arranged in step S3 in both horizontal and vertical directions.

[0024] In step S5, steps S3 and S4 are repeated multiple times based on the calculation results in the microcomputer to achieve the repair result.

[0025] A flexible reinforcement device for 3D printing repair of concrete structures includes 3D printing concrete flexible reinforcement repair technology and its construction device, flexible fiber reinforcement device, flexible mesh unit and 3D printing concrete composite material flexible reinforcement smoothing device.

[0026] The flexible fiber reinforcement device is installed on the 3D printed concrete flexible reinforcement repair technology and its construction device; the 3D printed concrete composite material flexible reinforcement smoothing device is installed on the 3D printed concrete flexible reinforcement repair technology and its construction device; the flexible mesh unit is installed next to the 3D printed concrete flexible reinforcement repair technology and its construction device; the 3D printed concrete flexible reinforcement repair technology and its construction device is used to repair the concrete structure by connecting with the flexible fiber reinforcement device, the flexible mesh unit, and the 3D printed concrete composite material flexible reinforcement smoothing device according to the input data of the concrete structure to be repaired.

[0027] Further, the 3D printing concrete flexible cloth reinforcement repair technology and its construction device include a 3D printing concrete output pump, a microcomputer controller and an infrared distance meter. The microcomputer controller is connected with a flexible fiber cloth reinforcement device, a flexible cloth net unit and a 3D printing concrete composite material flexible cloth reinforcement smoothing device, and is used for controlling the operation of the flexible fiber cloth reinforcement device, the flexible cloth net unit and the 3D printing concrete composite material flexible cloth reinforcement smoothing device. The infrared distance meter is used for measuring the height of the outlet of the 3D printing concrete flexible cloth reinforcement repair technology and its construction device.

[0028] The flexible cloth reinforcement device for the 3D printing repair of the concrete structure includes a mobile terminal connected with the microcomputer controller, which is used for real-time viewing of various index data and the working state of the 3D printing concrete flexible cloth reinforcement repair platform.

[0029] The flexible fiber cloth reinforcement device includes a flexible fiber storage, a wire roller, a wire cutter and a wire guide rail. The flexible fiber storage is used for storing the printing flexible fiber. The wire roller is used for outputting the printing flexible fiber. The wire cutter is used for cutting off the printing flexible fiber when the printing is ended or the printing direction is changed. The wire guide rail is used for controlling the direction and position of the output of the printing flexible fiber.

[0030] The flexible cloth net unit includes a fiber net direction changing rail, a fiber net storage, a storage fixing device, a fiber net storage, a net guide, a net guide rail, a storage fixing device and a fuse. The telescopic fixing device is used for fixing the flexible cloth net unit and can change the height of the flexible cloth net unit through telescopic extension and contraction. The rotating guide rail is used for changing the direction of the flexible cloth net unit. The fixed support is used for fixing the storage fixing device. The fiber net storage is used for storing the printing fiber net. The net guide is used for outputting the printing fiber net. The net guide rail is used for controlling the direction and position of the output of the printing fiber net. The storage fixing device is used for fixing the fiber net storage. The fuse is used for cutting off the printing fiber net when the printing is ended or the printing direction is changed.

[0031] The 3D printing concrete composite material flexible cloth reinforcement smoothing device includes a telescopic fixing device, a rotating guide rail, a fixed support and a scraper. The telescopic fixing device is used for fixing the scraper and can change the working height of the scraper through telescopic extension and contraction. The rotating guide rail is used for changing the working direction of the scraper. The fixed support is used for fixing the scraper. The scraper is used for smoothing the repair paste.

[0032] The technical concept of this invention is as follows: the 3D printed concrete flexible reinforcement repair technology and its construction device receive the specific repair scenario and the characteristics of the component to be repaired, design the repair scheme and composite material, add the corresponding materials to the flexible reinforcement storage, fiber mesh storage and 3D printed concrete output pump, and then sequentially start the flexible fiber reinforcement device, the flexible mesh unit and the 3D printed concrete composite material flexible reinforcement smoothing device, thereby repairing the concrete structure to be repaired.

[0033] The beneficial effects of this invention are mainly reflected in: it helps to accurately control the thickness of the 3D printed concrete interface and improve the density of the repair layer, while improving the toughness and strength of the repair surface in different directions, and more effectively resisting the effect of self-shrinkage on the weakening of the repair layer performance; it helps to enhance the interlayer continuity and anisotropic toughness of the 3D printed concrete repair layer, making the repair layer denser and better resisting deformation and cracking caused by shrinkage, and improving the intelligence and effectiveness of concrete repair. Attached Figure Description

[0034] Figure 1 A flowchart of the flexible reinforcement method for 3D printing repair of concrete structures provided by the present invention;

[0035] Figure 2 A schematic diagram of the composite material repair surface generated by the 3D printing concrete flexible reinforcement repair technology provided by the present invention;

[0036] Figure 3 A schematic diagram of the 3D-printed flexible reinforcement device for concrete composite materials provided by the present invention;

[0037] Figure 4 A schematic diagram of the 3D printed concrete composite material flexible reinforcement smoothing device provided by the present invention.

[0038] Figure 5 A schematic diagram of the cross-sectional structure of the 3D printed concrete flexible mesh unit provided by the present invention;

[0039] Figure 6 This is a schematic diagram of the side structure of the 3D printed concrete flexible mesh unit provided by the present invention.

[0040] The reference signs are: 1, fiber grid; 2, repair paste; 3, flexible tendon; 4, flexible tendon storage; 5, wire roller; 6, wire cutter; 7, wire guide; 8, wire guide rail; 9, repair surface; 10, 3D printing concrete output pump; 11, composite paste; 12, telescopic fixer; 13, rotating guide rail; 14, fixed support; 15, scraper; 16, fiber grid storage; 17, fiber grid; 18, flexible tendon; 19, fiber grid direction changing rail; 20, storage fixing device; 21, grid guide rail; 22, grid laying unit; 23, repair surface; 24, fuse; 25, grid laying paste. DETAILED DESCRIPTION

[0041] The application will be further described below with reference to the accompanying drawings.

[0042] Reference Figure 1 A flexible tendon method for 3D printing repair of concrete structure, comprising the following steps:

[0043] S1: According to the specific repair scene, the characteristics of the repaired component are extracted and the corresponding repair scheme and composite material design are designed;

[0044] In step S1, the repair scheme and composite material design are calculated by a microcomputer, and the microcomputer is built-in with a repair variable model for calculating the repair scheme and composite material design.

[0045] S2: According to the selected tendon laying requirement, the fiber filaments and fiber grids of appropriate diameter are selected, and the fiber filaments and fiber grid rolls are installed in the flexible tendon storage and fiber grid storage; and the mixed paste is placed in the 3D printing concrete output pump;

[0046] The fiber filament is made of any one or more than two combinations of carbon fiber, steel fiber, polypropylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, hemp fiber, wood pulp fiber, asbestos fiber, polyvinyl alcohol fiber or polyester fiber.

[0047] The fiber grid is made of any one or more than two combinations of carbon fiber, steel fiber, polypropylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, hemp fiber, wood pulp fiber, asbestos fiber, polyvinyl alcohol fiber or polyester fiber.

[0048] The paste is any one or more than two combinations of neat paste, ordinary mortar, alkali-activated mortar and fiber reinforced mortar.

[0049] Through the above technical solution, different types of fiber filaments, fiber grids and pastes can be used to repair different types of structures to be repaired, and meet the repair requirements under different scenes and conditions.

[0050] S3: using flexible fiber cloth muscle device and 3D printing concrete flexible cloth muscle repair technology and its construction device output material to complete the cloth paste cloth muscle on the repair surface, after the output is completed, the fiber wire is fused and the spatula is used to smooth the paste body to complete the output;

[0051] The flexible fiber cloth muscle device and the 3D printing concrete flexible cloth muscle repair technology and its construction device output materials along the established track.

[0052] The flexible fiber cloth muscle device has a wire guide rail 8 for accurately placing the fiber wire to the specified position; the 3D printing concrete flexible cloth muscle repair technology and its construction device has a 3D printing concrete output guide rail for accurately placing the paste body to the specified position.

[0053] The 3D printing concrete composite material flexible cloth muscle smoothing device has the function of smoothing the output material, and the travel route of the 3D printing concrete composite material flexible cloth muscle smoothing device should be consistent with the track of the 3D printing concrete flexible cloth muscle repair technology and its construction device, so as to avoid the squeezing and pulling of the spatula affecting the distribution of the wire muscle arranged by the flexible fiber cloth muscle device.

[0054] Through the above technical solution, the 3D printing concrete output guide rail of the 3D printing concrete flexible cloth muscle repair technology and its construction device can finely and accurately repair the specified position; the guide rail of the flexible fiber cloth muscle device can arrange the fiber wire in the specified position calculated by the microcomputer, and fix the direction of the original arranged paste body; the spatula is used to smooth the output material on the repaired surface, so that the output material is more uniform and dense.

[0055] S4: using flexible cloth net unit to arrange fiber grid, after the output is completed, the fiber net is fused and the spatula is used to smooth the paste body to complete the output;

[0056] The flexible cloth net unit outputs materials along the established track, and the flexible cloth net unit has a net guide rail for accurately placing the fiber net to the specified position.

[0057] Through the above technical solution, the net guide rail of the flexible cloth net unit can finely and accurately repair the specified position; the flexible cloth net unit can enhance the materials arranged in step S3 in horizontal and vertical directions.

[0058] S5: repeating the paste arrangement and cloth muscle in S3 and the smoothing work in S4 until the 3D printing concrete flexible cloth muscle repair platform completes the repair.

[0059] Steps S3 and S4 are repeated, and the results of the calculation in the microcomputer are repeated to achieve the repair results.

[0060] Reference Figures 2-6A flexible cloth reinforcement device for 3D printing repair of concrete structures, comprising a 3D printing concrete flexible cloth reinforcement repair technology and its construction device, a flexible cloth reinforcement device, a flexible cloth net unit and a 3D printing concrete composite material flexible cloth reinforcement smoothing device.

[0061] Referring to Figure 2 The 3D printing concrete flexible cloth reinforcement repair technology generates a composite material repair surface comprising a fiber grid 1, a repair paste 2 and a flexible reinforcement 3.

[0062] The repair surface is composed of two layers of multiple repair pastes 2, and the flexible reinforcement 3 is arranged in each printed repair paste 2 to realize longitudinal toughness reinforcement, and the transverse fiber grid 1 is arranged between the two layers of repair pastes 2 to realize transverse toughness reinforcement.

[0063] The flexible cloth reinforcement device is arranged on the 3D printing concrete flexible cloth reinforcement repair technology and its construction device; the 3D printing concrete composite material flexible cloth reinforcement smoothing device is arranged on the 3D printing concrete flexible cloth reinforcement repair technology and its construction device; the flexible cloth net unit is arranged beside the 3D printing concrete flexible cloth reinforcement repair technology and its construction device; the 3D printing concrete flexible cloth reinforcement repair technology and its construction device are used to repair the concrete structure according to the inputted data of the concrete structure to be repaired, and are connected with the flexible cloth reinforcement device, the flexible cloth net unit and the 3D printing concrete composite material flexible cloth reinforcement smoothing device.

[0064] The 3D printing concrete flexible cloth reinforcement repair technology and its construction device comprise a 3D printing concrete output pump, a microcomputer controller and an infrared distance meter, the microcomputer controller is connected with the flexible cloth reinforcement device, the flexible cloth net unit and the 3D printing concrete composite material flexible cloth reinforcement smoothing device, and is used to control the operation of the flexible cloth reinforcement device, the flexible cloth net unit and the 3D printing concrete composite material flexible cloth reinforcement smoothing device; the infrared distance meter is used to measure the height of the paste outlet of the 3D printing concrete flexible cloth reinforcement repair technology and its construction device.

[0065] The flexible cloth reinforcement device for 3D printing repair of concrete structures comprises a mobile terminal, the mobile terminal is connected with the microcomputer controller, and is used to view the index data and the working state of the 3D printing concrete flexible cloth reinforcement platform in real time.

[0066] Referring to Figure 3 The flexible cloth reinforcement device (hereinafter referred to as "flexible cloth reinforcement device") of the embodiment comprises a flexible reinforcement storage 4, a wire guide roller 5, a wire cutter 6, a wire guide 7, a wire guide rail 8, a repair surface 9, a 3D printing concrete output pump 10, a composite paste 11, a fiber net storage 16, a fiber net 17, a flexible reinforcement 18 and a cloth net unit 22.

[0067] The flexible tendon device is arranged on the surface of the concrete structure repair surface, and is used for orderly and stably outputting the slurry along the repair path on the concrete repair surface; the guide device 7 is used for guiding the flexible tendon 18 in the flexible tendon storage 4 to the guide rail 8 through the guide roller 5 by cooperating with the 3D printing concrete output pump 10, and realizing that the fiber silk on the guide rail 8 is in a tension-free state and is orderly wrapped by the slurry output by the 3D printing concrete output pump 10 through the cooperation between the two machines.

[0068] Referring to Figure 4 The 3D printing concrete composite material flexible tendon smoothing device (hereinafter referred to as “smoothing device”) shown in the figure comprises a telescopic fixator 12, a rotating guide rail 13, a fixed support 14 and a scraper 15.

[0069] The 3D printing concrete composite material flexible tendon smoothing device starts to work after the printing and tendon laying of the single-layer repair surface are completed, and is arranged on the surface of the single-layer repair surface. The smoothing device realizes the thickness control of the repair surface and the extrusion compaction of the repair unit through extrusion and cutting of the repair surface. The telescopic fixator 12 is used for fixing the smoothing device and adjusting the distance between the scraper 15 and the repair surface; the rotating guide rail 13 is used for adjusting the inclination angle between the scraper 15 and the slurry layer 2, so as to realize the mutual coordination between the scraping work and the repair slurry; and the fixed support 14 is used for fixing the scraper 15.

[0070] Referring to Figure 5 The 3D printing concrete flexible net laying unit 22 (hereinafter referred to as “net laying unit”) shown in the figure comprises a fiber net 17, a fiber net changing direction track 19, a storage fixing device 20, a net guide rail 21, a repair surface 23, a fuse 24 and a net laying slurry 25.

[0071] The net laying unit is developed after the printing and tendon laying and smoothing of the single-layer repair surface are completed, and is arranged on the surface of the net laying slurry 25 wrapping the repair surface 23. The net laying unit realizes the anisotropic defect compensation of the whole repair layer 1 and realizes the horizontal and vertical strengthening of the whole horizontal plane by arranging the fiber net 17 in the interlayer between the smoothed repair surface and the future arranged repair layer. The fiber net changing direction track 19 is fixed on the storage fixing device 20. The fiber net 17 realizes the accurate horizontal net laying through the fiber net changing direction track 19 and the net guide rail 21, and realizes the intelligent net line segmentation through the fuse 24.

[0072] Referring to Figure 6 The side surface structure of the net laying unit shown in the figure comprises the fiber net 17, the fiber net changing direction track 19, the storage fixing device 20, the net guide rail 21 and the fuse 24.

[0073] The fiber net 17 of the net laying unit realizes the directional, constant-speed and constant-quantity output through the fiber net changing direction track 19 and the net guide rail 21.

[0074] The netting unit is arranged on the single-layer repair surface after being smoothed, and the netting unit device realizes the continuous distribution of the fiber mesh in the horizontal and vertical directions of the repair surface by arranging the fiber mesh perpendicular to the path of the printing track, thereby completing the structural reinforcement of the repair surface. The flexible tendon fiber wire 3 is used by the netting unit 22 to fix the netting unit at a stable height to output the fiber mesh; the fiber mesh storage 16 and the storage fixing device 20 are fixed in the netting unit, and the required amount of fiber mesh is supplied according to the repair requirements; the mesh guide rail 21 is fixed at the rear end of the output port and arranged above the repair surface to guide the fiber mesh to be discharged at a suitable position of the concrete repair surface; and the fuse 24 is arranged at the output port to melt the mesh and cut off the connection after the distribution of the tendon is completed.

[0075] The 3D-printed concrete composite repair layer includes a concrete slurry 2, a flexible tendon fiber wire 3, and a flexible tendon fiber mesh 4.

[0076] The concrete slurry 2 is stably divided into a plurality of independent cuboid-shaped small units along the 3D-printed concrete path, and the specific mixing ratio of the concrete slurry is selected according to the required conditions in the actual project; the flexible tendon fiber wire 3 and the flexible tendon fiber mesh 4 are selected according to the strength requirements of the repair surface.

[0077] The working method of the 3D-printed concrete flexible tendon distribution device of the embodiment includes the following steps:

[0078] S1: According to the specific repair scene, the characteristics of the repaired component are extracted, and the corresponding repair scheme and composite material design are designed.

[0079] The reinforcement is calculated by using the concrete reinforcement calculation method to calculate the required number and width of the flexible tendon, and the calculation method is represented as:

[0080] ;

[0081] Wherein, A s is the area of the tensile flexible tendon (mm²); M u is the bending moment of the repair surface under the limit state (N·mm); f y is the yield strength of the flexible tendon (N / mm²); and d is the effective depth of the repair surface (mm). According to A s , the type and diameter of the fiber used are determined.

[0082] S2: According to the selected tendon distribution requirements, select the appropriate diameter of the fiber, and arrange the fiber wire and fiber mesh roll in the storage 4 and the storage 29 of the 3D-printed concrete flexible tendon distribution device and the 3D-printed concrete flexible netting unit; and place the mixed slurry into the 3D-printed concrete output pump 10.

[0083] Specifically, the fiber line and fiber mesh are distributed through the wire guide 7 and the wire guide rail 21, the wire guide rail 8 and the fiber mesh storage 16, and it is confirmed that, after the instrument is turned on, the fiber line and fiber mesh can be stably guided by the wire guide to the predetermined path, and can be wrapped by the slurry extruded by the 3D printing concrete output pump 10.

[0084] S3: The wire guide and the 3D printing concrete output pump Figure 3 complete the slurry and wire arrangement on the repair surface along the predetermined track, and after the output is completed, the wire cutter 6 automatically melts the fiber 3 to complete the output of the fiber 3 this time.

[0085] Specifically, when the wire guide travels along the route to arrange the wire, the wire guide roller 5 should maintain the same wire output efficiency, so that the fiber silk is attached to the slurry 2 based on the propelling force of the wire guide 7, avoiding the disturbance of the overall printed slurry caused by the pulling force of the wire guide on the slurry due to too slow output, and preventing the stacking of the wire at the output port due to too fast output speed.

[0086] S4: Use the scraper 15 to flatten the slurry along the direction of the concrete output pump and the wire guide, and the travel route of the scraper 15 should be consistent with the track of the 3D printing concrete output pump 10 to avoid the extrusion and pulling of the scraper affecting the distribution of the wire arranged by the wire guide; after the flattening is completed, use the mesh arranging unit to arrange the fiber mesh along the route perpendicular to the travel of the scraper, and after the output is completed, the fuse 24 automatically melts the fiber mesh 1 to complete the output of the fiber mesh 1 this time.

[0087] Specifically, when the mesh arranging unit travels along the route to arrange the mesh, the mesh guide rail 21 should maintain the same mesh line output efficiency, so that the fiber mesh is attached to the slurry 2 based on the propelling force of the guide rail 21, avoiding the disturbance of the overall printed slurry caused by the pulling force of the mesh arranging unit on the slurry due to too slow output, and preventing the stacking of the mesh at the output port due to too fast output speed. The travel track of the scraper 15 is consistent with the track of the slurry arrangement to avoid the extrusion and pulling of the scraper affecting the distribution of the wire arranged by the wire guide; after the flattening is completed, use the mesh arranging unit to arrange the fiber mesh 1 along the route perpendicular to the travel of the scraper 15, to realize the reinforcement of the direction which is relatively weak of the anisotropic slurry surface.

[0088] S5: Repeat the slurry arrangement and wire arrangement of S3, and repeat the flattening work in S4.

[0089] The 3D printing concrete flexible cloth bar repairing technology of the embodiment is based on the ability to print single flexible bar and concrete at the same time, the printed composite material can be arranged together layer by layer to form a dense repairing layer with toughness, and the fiber mesh is arranged between the repairing layers, the fiber mesh is tightly combined with the slurry through the extrusion of the scraper, and the toughness, strength and density of the repairing layer in different directions are ensured. While giving consideration to the high 3D printing concrete structure bar planting, the repairing layer cast has the characteristics of design flexibility, high tensile strength and good durability, and plays an important role in improving the service life of concrete. The construction process of the invention is simple, the cost is not high, the labor input can be greatly saved, the construction period is shortened, and the invention has good engineering feasibility and application value, which will greatly promote the practical application of 3D printing technology in the civil industry and promote the low-carbon development of the concrete industry.

[0090] The embodiments of the present specification are merely enumerations of implementation forms of the inventive concept, and are only for the purpose of description. The protection scope of the present application should not be regarded as being limited to the specific forms stated in the embodiments, and the protection scope of the present application also extends to equivalent technical means that can be thought of by those skilled in the art according to the inventive concept.

Claims

1. A flexible tendon method for concrete structure 3D printing repair, characterized in that, The method comprises the following steps: S1: According to the specific repair scene, the characteristics of the repaired component are extracted and the corresponding repair scheme and composite material design are designed; S2: According to the selected requirement of the fiber distribution, the fiber filaments and the fiber mesh are selected with appropriate diameters, and the fiber filaments and the fiber mesh are installed in the flexible fiber distribution device and the fiber mesh storage device; and the mixed slurry is placed in the 3D printing concrete output pump; S3: The flexible fiber distribution device and the 3D printing concrete flexible fiber repair technology and its construction device output materials to complete the distribution of the slurry and the fiber filaments on the repair surface, and after the output is completed, the fiber filaments are fused and the slurry is smoothed by using a scraper to complete the output; The flexible fiber distribution device and the 3D printing concrete flexible fiber repair technology and its construction device output materials along the predetermined track; The flexible fiber distribution device has a wire guide rail for accurately placing the fiber filaments to the designated position; and the 3D printing concrete flexible fiber repair technology and its construction device has a 3D printing concrete output guide rail for accurately placing the slurry to the designated position; The 3D printing concrete composite material flexible fiber smoothing device has the function of smoothing the output materials, and the travel route of the 3D printing concrete composite material flexible fiber smoothing device should be consistent with the track of the 3D printing concrete flexible fiber repair technology and its construction device, so as to avoid the squeezing and pulling of the scraper affecting the distribution of the fiber filaments arranged by the flexible fiber distribution device; S4: The fiber mesh is arranged by using the flexible fiber mesh unit, and after the output is completed, the fiber mesh is fused and the slurry is smoothed by using a scraper to complete the output; S5: The slurry distribution, fiber distribution and smoothing work in S3 and S4 are repeated until the 3D printing concrete flexible fiber repair platform completes the repair.

2. A flexible tendon method for concrete structure 3D printing repair according to claim 1, characterized in that, In step S1, the repair scheme and the composite material design are calculated by a microcomputer, and the microcomputer is provided with a repair variable model for calculating the repair scheme and the composite material design.

3. A flexible tendon method for 3D printing repair of concrete structures according to claim 1 or 2, characterized in that, In step S2, the fiber filament material is any one or a combination of two or more of carbon fiber, steel fiber, polypropylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, hemp fiber, wood pulp fiber, asbestos fiber, polyvinyl alcohol fiber or polyester fiber; The fiber mesh material is any one or a combination of two or more of carbon fiber, steel fiber, polypropylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, hemp fiber, wood pulp fiber, asbestos fiber, polyvinyl alcohol fiber or polyester fiber; The slurry is any one or a combination of two or more of net slurry, ordinary mortar, alkali-activated mortar and fiber-reinforced mortar.

4. The flexible tendon method for concrete structure 3D printing repair according to claim 1 or 2, characterized in that, In step S4, the flexible fiber mesh unit outputs materials along the predetermined track, and the flexible fiber mesh unit has a mesh guide rail for accurately placing the fiber mesh to the designated position.

5. A device for implementing the flexible tendon method of 3D printing repair of concrete structures as claimed in claim 1, characterized in that, The invention includes a 3D-printed concrete flexible reinforcement repair technology and its construction device, a flexible fiber reinforcement device, a flexible mesh unit, and a 3D-printed concrete composite flexible reinforcement smoothing device. The flexible fiber reinforcement device is mounted on the 3D-printed concrete flexible reinforcement repair technology and its construction device. The 3D-printed concrete composite flexible reinforcement smoothing device is also mounted on the 3D-printed concrete flexible reinforcement repair technology and its construction device. The flexible mesh unit is located beside the 3D-printed concrete flexible reinforcement repair technology and its construction device. The 3D-printed concrete flexible reinforcement repair technology and its construction device are used to repair concrete structures based on input data of the concrete structure to be repaired, and are connected to the flexible fiber reinforcement device, the flexible mesh unit, and the 3D-printed concrete composite flexible reinforcement smoothing device to achieve the repair of the concrete structure.

6. The apparatus of claim 5, wherein, The 3D-printed concrete flexible reinforcement repair technology and its construction device include a 3D-printed concrete output pump, a microcomputer controller, and an infrared rangefinder. The microcomputer controller is connected to the flexible fiber reinforcement device, the flexible mesh unit, and the 3D-printed concrete composite material flexible reinforcement smoothing device, and is used to control the operation of the flexible fiber reinforcement device, the flexible mesh unit, and the 3D-printed concrete composite material flexible reinforcement smoothing device. The infrared rangefinder is used to measure the height of the slurry outlet of the repair area and the 3D-printed concrete flexible reinforcement repair technology and its construction device. The flexible reinforcement device for 3D printing repair of concrete structures includes a mobile terminal, which is connected to a microcomputer controller to view various indicator data and the working status of the 3D printed concrete flexible reinforcement repair platform in real time.

7. The apparatus of claim 5 or 6, wherein, The flexible fiber reinforcement device includes a flexible reinforcement storage unit, a wire roller, a wire cutter, and a wire guide rail. The flexible reinforcement storage unit is used to store the flexible reinforcement for printing; the wire roller is used to output the flexible reinforcement for printing; the wire cutter is used to cut the flexible reinforcement for printing when printing ends or the printing direction is changed; and the wire guide rail is used to control the direction and position of the output flexible reinforcement for printing.

8. The apparatus of claim 5 or 6, wherein, The flexible mesh fabrication unit includes a fiber mesh reversing track, a fiber mesh storage unit, a storage unit fixing device, a mesh guide, a mesh guide rail, and a fuse. The fiber mesh storage unit is used to store the fiber mesh for printing; the mesh guide is used to output the fiber mesh for printing; the mesh guide rail is used to control the direction and position of the output fiber mesh for printing; the storage unit fixing device is used to fix the fiber mesh storage unit; and the fuse is used to cut the fiber mesh for printing when printing ends or the printing direction is changed.

9. The apparatus of claim 5 or 6, wherein, The 3D printed concrete composite flexible reinforcement smoothing device includes a telescopic fixing device, a rotating guide rail, a fixed bracket, and a scraper. The telescopic fixing device is used to fix the scraper and can change the working height of the scraper by telescopic movement; the rotating guide rail is used to change the working direction of the scraper; the fixed bracket is used to fix the scraper; and the scraper is used to smooth and repair the slurry.

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