Fiber reinforced plastic panel, anchoring device and prestressed reinforcement system

Abstract

The application relates to the technical field of building reinforcement, in particular to a fiber-reinforced plastic plate, an anchoring device and a prestressed reinforcement system. The fiber-reinforced plastic plate comprises a plurality of fiber layers arranged in a set direction in sequence, wherein at least part of the fiber layers are unidirectional fiber layers; and in the plurality of unidirectional fiber layers, the fiber directions of at least part of the unidirectional fiber layers are different. The fiber-reinforced plastic plate is anchored on a surface to be reinforced, and before anchoring, the fiber-reinforced plastic plate is tensioned in multiple directions to generate prestress in the multiple directions, so that cracks in different directions can be shrunk, repaired and constrained.

Description

Technical Field

[0001] This invention relates to the field of building reinforcement technology, and in particular to a fiber-reinforced plastic board, an anchoring device, and a prestressed reinforcement system. Background Technology

[0002] Due to changes in service life and function, most highways in China are in need of reinforcement and renovation. In response to environmental goals of low-carbon development and the trend towards lightweight and high-strength materials, fiber composite materials have seen significant development in the reinforcement of civil and bridge structures. Examples include fiberglass sleeve reinforcement of bridge pile foundations, basalt fiber grid reinforcement of beam bottoms, and the widespread application of carbon fiber cloth, carbon fiber plates, and prestressed carbon fiber plates, all of which have varying degrees of effectiveness in improving beam corrosion resistance, deflection resistance, and reducing contraction joints.

[0003] Taking carbon fiber reinforced plastic sheet (hereinafter referred to as carbon fiber sheet) reinforcement as an example, the common prestressed carbon fiber reinforced plastic sheet reinforcement involves setting a unidirectional carbon fiber reinforced plastic sheet at the crack, and then tensioning the carbon fiber reinforced plastic sheet along the direction of the carbon fibers, which is roughly perpendicular to the direction of crack extension. This common method can achieve a good shrinkage effect for cracks in one direction.

[0004] However, for cases with a large number of cracks and multidirectional cracks, such as cracks on bridge piers, in addition to cracks caused by the direct stress of external loads, there are also cracks caused by secondary stresses such as bending moments of the structure and cracks caused by uneven settlement of the piers. This results in a large number of multidirectional cracks on the piers. Common prestressed fiber reinforced plastic plate reinforcement is difficult to repair the contraction joints of existing multidirectional cracks and to restrain the further expansion trend of cracks. Summary of the Invention

[0005] The purpose of this invention is to provide a fiber-reinforced plastic board, an anchoring device, and a prestressed reinforcement system, so as to solve to a certain extent the technical problem in the prior art that prestressed fiber-reinforced plastic board reinforcement is difficult to repair shrinkage joints of existing multi-directional cracks and to restrain the further propagation trend of cracks.

[0006] The present invention provides a fiber-reinforced plastic board, comprising: a plurality of fiber layers arranged sequentially along a predetermined direction, wherein at least a portion of the fiber layers are unidirectional fiber layers; and in the plurality of unidirectional fiber layers, at least a portion of the unidirectional fiber layers have different fiber directions.

[0007] Fiber-reinforced plastic (FRP) boards comprise multiple unidirectional fiber layers with different fiber orientations. These FRP boards can be tensioned in different directions with predetermined elongation, thereby generating prestress in different directions and forming multidirectional FRP boards. The fiber orientation of the unidirectional fiber layers can be determined based on the crack direction of the substrate to be reinforced. One unidirectional fiber layer can be positioned so that its fiber orientation intersects with one crack direction (optionally, perpendicular placement can provide better crack restraint). The FRP board provided by this invention is anchored to the substrate to be reinforced. Before anchoring, the FRP board is tensioned in multiple directions to generate prestress in multiple directions, thereby achieving contraction joint repair and strong restraint of cracks in different directions. This ensures the long-term durability of the building. For example, it can effectively repair and restrain crack propagation in bridge piers caused by direct stress from external loads, secondary stresses such as bending moments, and uneven settlement of the piers, avoiding structural defects caused by weak loads at crack locations.

[0008] Furthermore, among the three adjacent fiber layers, the middle fiber layer is a unidirectional fiber layer, while the upper and lower fiber layers are both multidirectional fiber layers.

[0009] Furthermore, the fiber-reinforced plastic board is arranged in a quadrilateral shape; the multidirectional fiber layer is a bidirectional fiber layer.

[0010] Furthermore, the fiber directions of the plurality of unidirectional fiber layers are arranged perpendicularly to the crack directions of the substrate to be reinforced, in descending order of the number of cracks.

[0011] Furthermore, the fiber layer is carbon fiber cloth, and before the fiber-reinforced plastic board is formed, each layer of carbon fiber cloth is impregnated with an epoxy resin system, and multiple layers of carbon fiber cloth are laminated; the resin in the epoxy resin system is a trifunctional epoxy resin, the diluent in the epoxy resin system is a diglycidyl ether reactive diluent, and the curing agent in the epoxy resin system is an aromatic aliphatic amine.

[0012] The present invention provides an anchoring device for tensioning and anchoring the aforementioned fiber-reinforced plastic sheet; the anchoring device includes an anchoring plate and a plurality of tensioning plates, the plurality of tensioning plates being used to surround and fix the periphery of the fiber-reinforced plastic sheet, the anchoring plate being used to be pre-connected to the base surface to be reinforced, the plurality of tensioning plates being able to move along different predetermined directions respectively, and the tensioning plates being able to be connected and fixed to the anchoring plate.

[0013] Further, the anchor plate includes a first anchor plate and a second anchor plate disposed opposite to each other; the number of tension plates is four, and the four tension plates are used to connect to the four sides of the fiber-reinforced plastic plate; in a first direction, one side of the first anchor plate is fixedly connected to one tension plate, and one side of the second anchor plate is fixedly connected to another tension plate; in a second direction, both ends of the first anchor plate and both ends of the second anchor plate are provided with connecting plates, and the remaining two tension plates can be connected to the corresponding connecting plates; the first anchor plate is used to slide and connect with the base surface to be reinforced, and can be fixed relative to the base surface to be reinforced by a limiting member; the second anchor plate is used to fixally connect with the base surface to be reinforced.

[0014] Furthermore, the second anchor plate is provided with bolt connection round holes, and the first anchor plate is provided with strip holes. The extension direction of the strip holes is the same as the first direction, and a positioning rod for connecting and fixing to the base surface to be reinforced is inserted in the strip holes.

[0015] Furthermore, the limiting component includes a limiting screw and a nut; in the second direction, both ends of the first anchor plate and both ends of the second anchor plate are provided with limiting blocks, and the limiting blocks are provided with limiting holes; at the same end of the first anchor plate and the second anchor plate, both ends of the limiting screw are respectively inserted into the two limiting holes; the two ends of the limiting screw located between the two limiting blocks are each fitted with the nut.

[0016] Furthermore, the anchoring device also includes a first baffle, which is detachably connected to both tension plates in the first direction;

[0017] And / or, the anchoring device further includes a second baffle and a third baffle; in the first direction, one end of the second baffle is detachably connected to one of the tensioning plates, and the other end is detachably connected to the other tensioning plate; the third baffle is detachably connected to the second anchoring plate.

[0018] The present invention provides a prestressed reinforcement system, including the fiber-reinforced plastic plate and the anchoring device, wherein a plurality of tensioning plates are arranged and fixed around the periphery of the fiber-reinforced plastic plate.

[0019] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a fiber-reinforced plastic sheet according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the prestressed reinforcement system before tensioning, according to an embodiment of the present invention.

[0023] Figure 3 for Figure 2 The diagram shows the structure of the prestressed reinforcement system after tensioning along the second direction.

[0024] Figure 4 for Figure 2 The diagram shows the structure of the prestressed reinforcement system after tensioning along the first direction.

[0025] Figure 5 for Figure 2 The diagram shows a prestressed reinforcement system applied to a bridge.

[0026] Icons: 1-Fiber reinforced plastic sheet; 11-Unidirectional fiber layer; 12-Bidirectional fiber layer; 2-Anchoring device; 201-First tension plate; 202-Second tension plate; 203-First anchoring plate; 204-Second anchoring plate; 205-Connecting plate; 206-Strip hole; 207-Positioning rod; 208-Limiting screw; 209-Nut; 210-Limiting block; 211-First baffle; 3-Base surface to be reinforced. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0029] 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.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0033] It should be noted that the fiber-reinforced plastic board 1, anchoring device 2, and prestressed reinforcement system provided in the embodiments of the present invention can be used not only for bridges but also for other buildings.

[0034] like Figures 1 to 5 As shown, an embodiment of the present invention provides a fiber-reinforced plastic board 1, comprising a plurality of fiber layers arranged sequentially along a set direction, wherein at least a portion of the fiber layers are unidirectional fiber layers 11 (meaning that the fiber direction is one direction); among the plurality of unidirectional fiber layers 11, at least a portion of the unidirectional fiber layers 11 have different fiber directions.

[0035] In this embodiment, the fiber-reinforced plastic board 1 includes multiple unidirectional fiber layers 11 with different fiber directions. The fiber-reinforced plastic board 1 can be tensioned in different directions with a set elongation, thereby generating prestress in different directions to form a multidirectional fiber-reinforced plastic board. The fiber direction of the unidirectional fiber layer 11 can be determined according to the crack direction of the substrate 3 to be reinforced. One unidirectional fiber layer 11 is positioned so that its fiber direction intersects with one crack direction (optionally, it can be positioned perpendicularly, which can provide better constraint on the crack). The fiber-reinforced plastic board 1 provided in this embodiment is anchored to the substrate 3 to be reinforced. Before anchoring, the fiber-reinforced plastic board 1 is tensioned in multiple directions to generate prestress in multiple directions, thereby achieving contraction, repair, and strong constraint on cracks in different directions, thus ensuring the long-term durability of the building. For example, it can effectively repair and constrain cracks in bridge piers caused by direct stress from external loads, secondary stresses such as bending moments of the structure, and uneven settlement of the piers, avoiding structural defects caused by weak load at the crack location.

[0036] It should be noted that the sequential arrangement of multiple fiber layers describes the order of the arrangement of multiple fiber layers and does not imply that other structures cannot be arranged between two adjacent fiber layers.

[0037] The fiber layer can be a carbon fiber layer, thus making the fiber-reinforced plastic board a carbon fiber board; or the fiber layer can be a glass fiber layer, thus making the fiber-reinforced plastic board a glass fiber board, etc.

[0038] Multiple fiber layers can all be unidirectional fiber layers 11. Among the multiple unidirectional fiber layers 11, the fiber directions of each unidirectional fiber layer 11 may be different, or some unidirectional fiber layers 11 may have different fiber directions, and there may be two or more unidirectional fiber layers 11 with the same fiber direction.

[0039] As an optional solution, among the three adjacent fiber layers, the middle fiber layer is a unidirectional fiber layer 11, and the upper and lower fiber layers are multidirectional fiber layers (meaning that there are multiple fiber directions). Specifically, the uppermost and lowermost fiber layers of the fiber-reinforced plastic board are multidirectional fiber layers, and the multiple fiber layers are arranged in the order of multidirectional fiber layer, unidirectional fiber layer, multidirectional fiber layer, unidirectional fiber layer, multidirectional fiber layer, unidirectional fiber layer... multidirectional fiber layer.

[0040] In this embodiment, the fiber directions of the multiple unidirectional fiber layers 11 can be defined as A, B, C, D, etc. When the fiber-reinforced plastic board 1 is tensioned in the A direction, the unidirectional fiber layers 11 in other fiber directions are also subjected to the A-direction tension. Multidirectional fiber layers are provided on both the upper and lower sides of the unidirectional fiber layers 11. The multidirectional fiber layers can adapt to tension and elongation in multiple directions, thereby preventing the unidirectional fiber layers 11 from loosening when subjected to tension in directions different from their own fiber directions, thus ensuring the integrity of the fiber-reinforced plastic board 1 and ensuring the effect of repairing and restraining cracks.

[0041] The fiber-reinforced plastic board 1 can be circular, pentagonal, hexagonal, or other shapes. When using the fiber-reinforced plastic board 1 provided in this embodiment of the invention, the anchoring device 2 is used to tension and anchor the fiber-reinforced plastic board 1 around its perimeter, that is, to tension and anchor the fiber-reinforced plastic board 1 circumferentially.

[0042] As an alternative, such as Figure 1 As shown, the fiber-reinforced plastic board 1 is arranged in a quadrilateral shape; the multidirectional fiber layer is a bidirectional fiber layer 12.

[0043] In this embodiment, the fiber-reinforced plastic plate 1 is arranged in a quadrilateral (preferably rectangular) shape. Tensioning is then performed in both the width and length directions of the fiber-reinforced plastic plate 1. The tension in the length direction, the tension in the width direction, and their components in a specific fiber direction can achieve tensioning of multiple unidirectional fiber layers 11. This allows for tensioning of the fiber-reinforced plastic plate 1 in multiple directions, simplifying the anchoring device 2 structure and the tensioning process. The multidirectional fiber layer is a bidirectional fiber layer, which can adapt to multidirectional tensioning and avoids overly complex structures.

[0044] Based on the above embodiments, the stacking structure of the unidirectional fiber layers 11 can be further configured as needed. Optionally, the fiber directions of the multiple unidirectional fiber layers 11 are arranged perpendicularly to the crack directions of the substrate 3 to be reinforced, in descending order of the number of cracks. Specifically, among the numerous cracks on the substrate 3 to be reinforced, the crack directions include A... ’ Direction, B ’ Direction, C ’ Direction, D ’ Direction, etc., where A ’ The direction with the largest total number of cracks is B. ’ Total number of cracks in the direction, C ’ Total number of cracks in the direction, D ’ The total number of cracks in each direction decreases sequentially. Among the multiple unidirectional fiber layers 11, the fiber direction of the first unidirectional fiber layer is the same as that of A. ’ The fiber direction of the second unidirectional fiber layer is perpendicular to direction A, and the fiber direction is perpendicular to direction B. ’The direction of the third unidirectional fiber layer is perpendicular to direction B, and the fiber direction is perpendicular to direction C. ’ The direction of the fourth unidirectional fiber layer is perpendicular to direction C, and the fiber direction is perpendicular to direction D. ’ The direction perpendicular to D, and so on. In use, the first unidirectional fiber layer of the fiber-reinforced plastic board 1 provided in this embodiment is placed close to the substrate 3 to be reinforced. This arrangement is more effective in contracting and restraining numerous multidirectional cracks, resulting in good reinforcement.

[0045] Based on any of the above embodiments, multiple fiber layers in a fiber-reinforced plastic sheet can be woven into a single fabric in a three-dimensional manner, and then made into a sheet.

[0046] Alternatively, multiple fiber layers are made of fiber cloth, and the multi-layer fiber cloth is laminated to form a fiber-reinforced plastic board. (Lamination refers to the process of forming by using a lamination process, which is a method of combining two or more layers of the same or different materials into a whole by heating and pressurizing, with or without adhesives.)

[0047] Specifically, the fiber cloth is carbon fiber cloth, and before the fiber reinforced plastic board 1 (that is, when the fiber layer is carbon fiber cloth, the fiber reinforced plastic board is a carbon fiber board) is formed, each layer of carbon fiber cloth is impregnated with an epoxy resin system, and the multilayer carbon fiber cloth is laminated; the resin in the epoxy resin system is a trifunctional epoxy resin, the diluent in the epoxy resin system is a diglycidyl ether reactive diluent, and the curing agent in the epoxy resin system is an aromatic aliphatic amine.

[0048] In this embodiment, before molding, the upper and lower surfaces of each layer of carbon fiber cloth are impregnated with an epoxy resin system. The epoxy resin system includes resin, diluent, and curing agent. The resin is a trifunctional epoxy resin, which can improve the reactivity and increase the crosslinking density, thereby improving the strength of the resin body and preventing interlayer delamination. The diluent is a diglycidyl ether reactive diluent, which can improve the resin wettability and prevent interlayer delamination during the tensioning of the fiber-reinforced plastic sheet 1. The curing agent is an aromatic aliphatic amine, which can further increase the structural stiffness of the resin while maintaining a low curing temperature, preventing the decrease in the interlayer bonding strength of the carbon fiber laminate due to excessive residual thermal stress after curing.

[0049] The unidirectional fiber layer is unidirectional carbon fiber cloth, and the bidirectional fiber layer is bidirectional carbon fiber cloth. Unidirectional carbon fiber cloth generally refers to cloth woven from warp carbon fibers and weft hot melt adhesive yarn. Bidirectional carbon fiber cloth is woven from warp carbon fibers and weft carbon fibers. Multidirectional carbon fiber cloth can be woven carbon fiber cloth, with common weave structures including plain weave, twill weave, and satin weave; it can also be multidirectional nonwoven fiber cloth, etc.

[0050] like Figures 2 to 5As shown, this embodiment of the invention provides an anchoring device 2 for tensioning and anchoring the fiber-reinforced plastic sheet 1 of any of the above technical solutions. The anchoring device 2 includes an anchoring plate and multiple tensioning plates. The multiple tensioning plates are used to surround and fix the fiber-reinforced plastic sheet 1 around its perimeter. The anchoring plate is used to be pre-connected to the base surface 3 to be reinforced. The multiple tensioning plates can move along different set directions respectively, and the tensioning plates can be connected and fixed with the anchoring plate.

[0051] When using the anchoring device 2 provided in this embodiment to tension and anchor the fiber-reinforced plastic board 1, the tensioning plate can be fixed around the fiber-reinforced plastic board 1, that is, the tensioning plate surrounds the fiber-reinforced plastic board 1; the anchoring plate is pre-connected to the base surface 3 to be reinforced; a tensioning power device such as a jack is used to drive the tensioning plate to move outward (that is, towards the anchoring plate), and the tensioning plate drives the fiber-reinforced plastic board 1 to extend in the corresponding direction; when the tensioning plate reaches the anchoring plate, the tensioning plate and the anchoring plate are connected, thereby fixing the tensioned state of the fiber-reinforced plastic board 1 and realizing the reinforcement of the prestressed fiber-reinforced plastic board 1.

[0052] Specifically, a groove can be provided on one side wall of the tensioning plate, and connecting holes (e.g., through holes or threaded holes) can be provided on both the upper and lower surfaces of the tensioning plate. The edge of the fiber-reinforced plastic sheet 1 is clamped in the groove, and fasteners (e.g., bolts or screws) are passed through the connecting holes on the upper surface of the tensioning plate, the edge of the fiber-reinforced plastic sheet 1 (through holes can be pre-provided on the edge of the fiber-reinforced plastic sheet 1), and then through the connecting holes on the lower surface of the tensioning plate. This ensures a firm connection between the tensioning plate and the fiber-reinforced plastic sheet 1. Furthermore, interlocking teeth can be provided on the inner wall of the groove to increase the friction between the tensioning plate and the fiber-reinforced plastic sheet 1, further strengthening the connection between them.

[0053] The structure of the anchoring device 2 can be determined according to the shape of the fiber-reinforced plastic sheet 1. For example, when the fiber-reinforced plastic sheet 1 is circular, the tensioning plate is an arc-shaped segment, and multiple tensioning plates surround the perimeter of the circular fiber-reinforced plastic sheet. The multiple tensioning plates also form a circle. The number of anchoring plates is equal to the number of tensioning plates. The anchoring plates are pre-fixed on the base surface 3 to be reinforced, with one anchoring plate corresponding to one tensioning plate. In the radial direction of the fiber-reinforced plastic sheet 1, the anchoring plates are located on the outside of the tensioning plates, and there is a set distance between the anchoring plates and the tensioning plates (this distance can be the fiber-reinforced plastic sheet). The tensioning plate is pulled to the corresponding anchor plate by the elongation of plate 1 in the corresponding direction, and then the tensioning plate and the anchor plate are connected by fasteners (e.g., bolts, screws or pins). Similarly, when the fiber reinforced plastic plate 1 is polygonal in shape, a tensioning plate adapted to the edge of the fiber reinforced plastic plate 1 can be fixed on each side of the fiber reinforced plastic plate 1. The number of anchor plates is the same as the number of tensioning plates, with one tensioning plate corresponding to one anchor plate. The anchor plates are arranged parallel to and spaced apart from the corresponding tensioning plates, and the tensioning plate can be pulled to the corresponding anchor plate for connection and fixation.

[0054] As an alternative, such as Figures 2 to 4 As shown, the fiber-reinforced plastic board 1 is arranged in a quadrilateral shape. The anchoring plates include a first anchoring plate 203 and a second anchoring plate 204 arranged opposite to each other. There are four tensioning plates, which are used to connect to the four sides of the fiber-reinforced plastic board 1. Specifically, the four tensioning plates include two first tensioning plates 201 and two second tensioning plates 202 arranged opposite to each other. In the first direction (which can be the width direction of the fiber-reinforced plastic board 1; when the multidirectional fiber layer is a bidirectional fiber layer, the first direction can be the same as the direction of the first fiber in the bidirectional fiber layer), the two first tensioning plates 201 are respectively used to connect to the two sides of the fiber-reinforced plastic board 1. In the second direction (which can be the length direction of the fiber-reinforced plastic board 1; when the multidirectional fiber layer is a bidirectional fiber layer), the two first tensioning plates 201 are respectively used to connect to the two sides of the fiber-reinforced plastic board 1. When the fiber layer is extended (the first direction can be the same as the second fiber direction in the biaxial fiber layer), two second tension plates 202 are respectively used to connect to the other two sides of the fiber-reinforced plastic plate 1; in the first direction, one side of the first anchor plate 203 is fixedly connected to one first tension plate 201, and one side of the second anchor plate 204 is fixedly connected to another first tension plate 201; in the second direction, both ends of the first anchor plate 203 and both ends of the second anchor plate 204 are provided with connecting plates 205, and the second tension plate 202 can be connected to the connecting plates 205; the first anchor plate 203 is used to slide and connect to the base surface 3 to be reinforced, and can be fixed to the base surface 3 to be reinforced by limiting members; the second anchor plate 204 is used to fixally connect to the base surface 3 to be reinforced.

[0055] In this embodiment, after assembling the tensioning plate and the fiber-reinforced plastic plate 1, the second anchoring plate 204 is fixed on the base surface 3 to be reinforced, and the first anchoring plate 203 is fixed in place. A tensioning power device such as a jack is used to pull the two second tensioning plates 202 to the connecting plates 205 at both ends of the first anchoring plate 203. Then, one end of one second tensioning plate 202 is connected to the connecting plate 205 at one end of the first anchoring plate 203, and the other end of the second tensioning plate 202 is connected to the connecting plate 205 at one end of the second anchoring plate 204. One end of the other second tensioning plate 202 is connected to the connecting plate 205 at the other end of the first anchoring plate 203, and the other end of the second tensioning plate 202 is connected to the connecting plate 205 at the other end of the second anchoring plate 204, thereby completing the tensioning of the fiber-reinforced plastic plate 1 in the second direction. Then, a tensioning power device such as a jack is used to pull the first anchor plate 203 away from the second anchor plate 204. The first anchor plate 203 drives the corresponding first tensioning plate 201 to move until the fiber-reinforced plastic plate 1 elongates by a set amount in the first direction, that is, the fiber-reinforced plastic plate 1 is tensioned to the required force value in the first direction. Then, the first anchor plate 203 is connected and fixed to the corresponding reinforced base surface 3 by a limiting member, thereby completing the tensioning of the fiber-reinforced plastic plate 1 in the first direction. Thus, the circumferential tensioning of the fiber-reinforced plastic plate 1 is completed. In this embodiment, the anchoring device 2 reduces the number of anchor plates and the connection process between the tensioning plate and the anchor plate, making it more convenient to use.

[0056] Specifically, a slot for sliding the second tension plate 202 can be provided on the side wall of the connecting plate 205. Holes are provided through the upper and lower surfaces of the connecting plate 205, and corresponding holes are provided on the second tension plate 202. When the second tension plate 202 moves into the slot and the hole on the second tension plate 202 aligns with the hole on the connecting plate 205, the fiber-reinforced plastic plate 1 extends to a set amount in the second direction. At this time, fasteners (e.g., bolts or screws) are used to pass through the holes on the connecting plate 205 and the second tension plate 202 to connect and fix the connecting plate 205 and the second tension plate 202. Of course, other connection and fixing methods are also possible.

[0057] There are several ways to keep the first anchor plate 203 fixed during the process of pulling the second tension plate 202. For example, a positioning hole is provided on the first anchor plate 203, and a positioning bolt is inserted into the positioning hole. A positioning threaded hole is provided on the base surface 3 to be reinforced. The positioning bolt is screwed into the positioning bolt hole through the positioning hole. When it is necessary to pull the first anchor plate 203, the positioning bolt is unscrewed, and then the first anchor plate 203 is pulled.

[0058] As an alternative, such as Figures 2 to 4As shown, the second anchor plate 204 is provided with bolt connection round holes (the base surface 3 to be reinforced is provided with corresponding bolt holes), the first anchor plate 203 is provided with strip holes 206, the extension direction of the strip holes 206 is the same as the first direction, and a positioning rod 207 is inserted into the strip holes 206.

[0059] In this embodiment, the second anchor plate 204 can be completely constrained on the base surface 3 by screwing the bolt through the bolt connection hole into the bolt hole on the base surface 3 to be reinforced. Multiple bolt connection holes can be provided on the second anchor plate 204 along the second direction, and multiple bolts can be used to connect the second anchor plate 204 with the base surface 3 to be reinforced.

[0060] During the movement of the second tension plate 202, the positioning rod 207 (e.g., a bolt) is located at the end of the strip hole 206 away from the second anchor plate 204, and the positioning rod 207 constrains that end of the first anchor plate 203. When the first anchor plate 203 is pulled, the positioning rod 207 slides relatively within the strip hole 206. When the positioning rod 207 is located at the end of the strip hole 206 near the second anchor plate 204, the fiber-reinforced plastic plate 1 elongates by a set amount. At this time, the position of the first anchor plate 203 relative to the reinforced base surface is fixed by the limiting member. In this embodiment, the cooperation of the strip hole 206 and the positioning rod 207 not only ensures that the first anchor plate 203 remains stationary during the movement of the second tension plate 202, but also restricts the movement of the first anchor plate 203, making the movement of the first anchor plate 203 more stable.

[0061] The limiting component can have various structural forms. For example, the limiting component includes a limiting bolt, with corresponding bolt holes provided on the first anchor plate 203 and the base surface 3 to be reinforced. When the first anchor plate 203 is tensioned into place, the bolt holes on the first anchor plate 203 and the bolt holes on the base surface 3 to be reinforced are aligned. The limiting bolt is then screwed into the bolt holes on the first anchor plate 203 and the bolt holes on the base surface 3 to be reinforced in sequence. In this embodiment, the limiting component directly connects and fixes the first anchor plate 203 and the base surface to be reinforced.

[0062] As an alternative, such as Figures 2 to 4 As shown, the limiting component includes a limiting screw 208 and a nut 209; in the second direction, both ends of the first anchor plate 203 and both ends of the second anchor plate 204 are provided with limiting blocks 210, and the limiting blocks 210 are provided with limiting holes; at the same end of the first anchor plate 203 and the second anchor plate 204, both ends of the limiting screw 208 are respectively inserted into the two limiting holes; the nuts 209 are sleeved on both ends of the limiting screw 208 located between the two limiting blocks 210.

[0063] In this embodiment, after the first anchoring plate 203 is tensioned into place, the first end of the limiting screw 208 is passed through a limiting hole, and then two nuts 209 are fitted onto the limiting screw 208 from the first end. The first end of the limiting screw 208 then passes through another limiting hole. The two nuts 209 are rotated so that one nut 209 abuts against one limiting block 210, and the other nut 209 abuts against another limiting block 210, thereby keeping the fiber-reinforced plastic plate 1 in a tensioned state, thus indirectly connecting and fixing the first anchoring plate to the base surface to be reinforced. This type of limiting component avoids processing on the base surface 3 to be reinforced, reducing the processing process on the construction site and making it more convenient to use. After the limiting screw 208 and limiting nuts 209 are installed in place, the tensioning power components such as jacks can be removed.

[0064] Based on the above embodiments, the anchoring device 2 further includes a first baffle 211, and the first baffle 211 can be detachably connected to both second tension plates 202.

[0065] In this embodiment, before the second pull plate 202 moves, a first baffle 211 can be connected to both second pull plates 202. The first baffle 211 can provide a point of force for the jack, making it easier for the jack to drive the second pull plate 202 to move. After the second pull plate 202 is connected to the connecting plate 205, the jack is removed, and then the first baffle 211 is removed.

[0066] The first baffle 211 and the second tension plate 202 can be detachably connected by bolts. The first baffle 211 can be straight, and for better jacking, the first baffle 211 is preferably perpendicular to the second tension plate 202; or, the second baffle can be L-shaped, with one side connected to the second tension plate 202 and the other side perpendicular to the second tension plate 202.

[0067] Based on the above embodiments, the anchoring device 2 further includes a second baffle and a third baffle; one end of the second baffle is detachably connected to a second tension plate 202, and the other end is detachably connected to another second tension plate 202; the third baffle is detachably connected to the second anchoring plate 204.

[0068] In this embodiment, before moving the first anchor plate 203, the two ends of the second baffle are connected to the two second tension plates respectively, and the third baffle is connected to the first anchor plate 203. The second and third baffles can provide a force point for the jack, facilitating the application of force by the jack. After the limiting component is assembled in place, the jack is removed, and then the second and third baffles are dismantled.

[0069] The second baffle and the second tension plate 202 can be detachably connected by bolts, and the third baffle can be detachably connected to the first anchor plate 203 by bolts. It is easy to understand that, for ease of jacking, the second baffle is preferably positioned perpendicular to the second tension plate 202, and the third baffle is preferably positioned perpendicular to the first anchor plate 203.

[0070] Embodiments of the present invention also provide a prestressed reinforcement system, comprising the fiber-reinforced plastic plate 1 of any of the above-described technical solutions and the anchoring device 2 of any of the above-described technical solutions. Therefore, it possesses all the beneficial technical effects of the fiber-reinforced plastic plate 1 and the anchoring device 2, which will not be elaborated further here. The prestressed reinforcement system provided in this embodiment can effectively shrink and strongly restrain multi-directional cracks, and the tensioning and anchoring of the fiber-reinforced plastic plate 1 is convenient during construction.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. Numerous specific details are set forth in the specification provided herein. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification. Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the present invention and form different embodiments.

Claims

1. An anchoring device, characterized in that, Used for tensioning and anchoring fiber reinforced plastic sheet; the anchoring device includes an anchoring plate and four tensioning plates, the four tensioning plates are used to surround and fix the periphery of the fiber reinforced plastic sheet, the anchoring plate is used to be pre-connected to the base surface (3) to be reinforced, the four tensioning plates can move in different set directions respectively, and the tensioning plates can be connected and fixed with the anchoring plate; The anchor plate includes a first anchor plate (203) and a second anchor plate (204) arranged opposite to each other; four tension plates are used to connect to the four sides of the fiber reinforced plastic plate; in a first direction, one side of the first anchor plate (203) is fixedly connected to one tension plate, and one side of the second anchor plate (204) is fixedly connected to another tension plate; in a second direction, both ends of the first anchor plate (203) and both ends of the second anchor plate (204) are provided with connecting plates (205), and the remaining two tension plates can be connected to the corresponding connecting plates (205); the first anchor plate (203) is used to slide and connect to the base surface (3) to be reinforced, and can be fixed relative to the base surface (3) to be reinforced by a limiting member; the second anchor plate (204) is used to fixally connect to the base surface (3) to be reinforced; The limiting component includes a limiting screw (208) and a nut (209); in the second direction, both ends of the first anchor plate (203) and both ends of the second anchor plate (204) are provided with limiting blocks (210), and the limiting blocks (210) are provided with limiting holes; at the same end of the first anchor plate (203) and the second anchor plate (204), both ends of the limiting screw (208) are respectively inserted into the two limiting holes; the two ends of the limiting screw (208) located between the two limiting blocks (210) are each fitted with the nut (209). The fiber-reinforced plastic board includes: a plurality of fiber layers arranged sequentially along a set direction, wherein at least a portion of the fiber layers are unidirectional fiber layers (11); among the plurality of unidirectional fiber layers (11), at least a portion of the unidirectional fiber layers (11) have different fiber directions.

2. The anchoring device according to claim 1, characterized in that, Of the three adjacent fiber layers, the middle fiber layer is a unidirectional fiber layer (11), and the upper and lower fiber layers are multidirectional fiber layers.

3. The anchoring device according to claim 1, characterized in that, The fiber directions of the multiple unidirectional fiber layers (11) are arranged perpendicularly to the direction of the cracks in the substrate (3) to be reinforced, from the largest to the smallest number of cracks.

4. The anchoring device according to any one of claims 1-3, characterized in that, The fiber layer is carbon fiber cloth. Before the fiber-reinforced plastic board is formed, each layer of carbon fiber cloth is impregnated with an epoxy resin system. Multiple layers of carbon fiber cloth are laminated. The resin in the epoxy resin system is a trifunctional epoxy resin. The diluent in the epoxy resin system is a diglycidyl ether reactive diluent. The curing agent in the epoxy resin system is an aromatic aliphatic amine.

5. The anchoring device according to claim 1, characterized in that, The second anchor plate (204) is provided with bolt connection round holes, and the first anchor plate (203) is provided with strip holes (206). The extension direction of the strip holes (206) is the same as the first direction. A positioning rod (207) for connecting and fixing with the base surface (3) to be reinforced is inserted in the strip holes (206).

6. The anchoring device according to claim 1, characterized in that, The anchoring device further includes a first baffle (211), and in the first direction, the first baffle (211) can be detachably connected to both tension plates. And / or, the anchoring device further includes a second baffle and a third baffle; in the first direction, one end of the second baffle is detachably connected to one of the tensioning plates, and the other end is detachably connected to the other tensioning plate; the third baffle is detachably connected to the second anchoring plate (204).

7. A prestressed reinforcement system, characterized in that, The device includes the anchoring device as described in any one of claims 1-6, wherein a plurality of the tensioning plates are arranged and fixed around the periphery of the fiber-reinforced plastic plate.

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