Tensioned CFRP plate anchoring system and construction method thereof

Abstract

The application discloses a tensioning CFRP plate anchoring system and a construction method thereof, which comprises a structure to be reinforced and a CFRP plate. The two ends of the CFRP plate are connected with the structure to be reinforced through anchoring devices. At least one of the two anchoring devices is a forward tensioning anchoring device. At least one supporting device is arranged between the CFRP plate and the structure to be reinforced. The forward tensioning anchoring device comprises an anchoring seat, a connecting piece and a CFRP anchorage device. The connecting piece is rotatably connected with the anchoring seat through a first direction pivot. The CFRP anchorage device is slidably connected with the connecting piece through a traction screw. A prestress adjusting mechanism is detachably arranged between the CFRP anchorage device and the connecting piece. A locking nut is arranged on the traction screw. The effect of the application is that only a section of CFRP plate is used to realize external prestress reinforcement in the application, so that a fixing mechanism only needs to be arranged at the end of the section of CFRP plate. The number of anchorage devices required for construction is greatly reduced, and the process of tensioning the CFRP plate is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of applying external prestress in civil engineering, in particular to a tensioned CFRP plate anchoring system and a construction method thereof. BACKGROUND

[0002] Concrete structural members or steel structural members in modern building, traffic, bridge and other engineering structures may have great safety hazards due to environmental erosion, material aging, change of structural function, change of load, insufficient bearing capacity or cracking caused by natural disasters.

[0003] At present, the reinforcement methods for engineering members are divided into two categories: passive reinforcement method and active reinforcement method. Passive reinforcement method refers to directly adding tensile (or shear) reinforcing materials, such as sticking steel plates, sticking high-strength fiber composite materials (carbon fiber, aramid fiber), etc., in the tensile (or shear) weak area of the member. The reinforcing materials only bear the internal force caused by live load and additional dead load, and the strain (stress) thereof is relatively lagging compared with the original load-bearing member. In particular, the high tensile property of the reinforcing materials cannot be fully utilized in the scheme of directly sticking high-strength fiber composite materials. Therefore, passive reinforcement method cannot reduce the deformation of the original structure and cannot seal the cracks. Active reinforcement method refers to applying prestress to the reinforcing materials arranged in the tensile (or shear) weak area of the member. The reinforcing materials are actively stressed, which fundamentally solves the problem of strain (stress) lagging of the additional reinforcing materials, fully utilizes the high tensile property of the reinforcing materials, improves the utilization efficiency of the materials, and significantly improves the bending bearing capacity and normal working performance of the reinforced member.

[0004] Chinese invention patent ZL201711297399.4 discloses a CFRP plate multi-point support prestressed reinforcement structure assembly and a prestress applying method thereof. The structure assembly comprises a structural member which is a metal structural member suitable for bearing load, a CFRP plate provided on the structural member and having at least two connection points connected to the structural member, and a support device provided on the structural member and located between the two connection points. The support device comprises an adjusting screw and a support piece. The adjusting screw is rotatably provided on the structural member, and the support piece is threadedly connected with the adjusting screw. The distance between the support piece and the structural member is adjustable when the adjusting screw is rotated. The support piece supports the CFRP plate and deforms the CFRP plate away from the structural member when the distance between the support piece and the structural member increases.

[0005] However, the above structure assembly has the following defects in the process of applying prestress:

[0006] (1) The screw is a slender member, and the screw is prone to buckling under compression during the jacking process, which is dangerous in construction;

[0007] (2) When forming multi-point support, multiple screws need to be jacked at the same time, and manual operation cannot guarantee synchronous jacking and uniformity, which may cause uneven stress on the carbon fiber plate;

[0008] (3) The jacking force of the screw is very limited, and cannot achieve large tonnage, which limits the engineering application scenarios;

[0009] (4) The end uses a flat clamping method, the anchoring efficiency is low, and the prestress loss is large;

[0010] (5) The support rod is screwed by bolts, which causes large prestress loss and construction difficulty;

[0011] (6) The end lacks turning measures, which may cause the CFRP plate to bend or twist and cause damage or even breakage of the CFRP plate.

[0012] Therefore, Chinese invention patent ZL201911310457.1 discloses a CFRP sheet combined beam installation system, which comprises a beam body, n+1 CFRP sheets, n fixed supports and 2n+2 anchors, n is a positive integer greater than or equal to 1, the beam body is horizontally arranged, the fixed support is arranged on the lower surface of the beam body, the lower end of the fixed support is hingedly connected with two anchors, the lower surface of the beam body is also provided with two hinged seats, the fixed support is located between the two hinged seats, the two hinged seats are respectively hingedly connected with one anchor, the CFRP sheet is arranged between the hinged seat and the fixed support adjacent thereto, the CFRP sheet is also arranged between the two adjacent fixed supports, and the two ends of the CFRP sheet are clamped on the corresponding anchors. The patent disperses the vertical load through the support, thereby relieving the local stress of the structure, and uses the hinged seat to relatively disperse the stress during the stretching of the CFRP sheet, which avoids shear failure of the CFRP sheet and is beneficial to uniform stress on the CFRP sheet.

[0013] However, the CFRP sheet in the above system uses a segmented anchoring method, which still has the following problems in construction:

[0014] (1) The CFRP sheet is divided into multiple segments, each segment needs 2 anchors, the number of anchors is large, the operation is complex, and the cost is high;

[0015] (2) The CFRP sheet is arranged in segments, each segment needs to be prestressed and tensioned, the construction steps are multiple and complicated, and the prestress is difficult to keep consistent;

[0016] (3) The segmented type is used, and each segment will have prestress loss, and the node has no adjustment;

[0017] (4) If the prestress tension of the adjacent CFRP sheets is not synchronized, the fixed support will be subjected to unbalanced force, which may lead to adverse consequences. If synchronous tension is to be adopted, all segments need to be tensioned synchronously, which is difficult to implement and is difficult to apply. SUMMARY

[0018] The present application aims to provide a sequential tension CFRP plate anchoring system, which only uses a continuous CFRP plate to achieve reinforcement, so that only the end of the CFRP plate needs to be provided with a fixing mechanism, and only the CFRP plate needs to be tensioned when prestress is applied, which not only greatly reduces the number of anchorage devices required for construction, but also reduces the tensioning difficulty, thereby improving the construction efficiency.

[0019] To achieve the above-mentioned purpose, the present application first provides a sequential tension CFRP plate anchoring system, which comprises a structure to be reinforced and a CFRP plate, and the key lies in that: the two ends of the CFRP plate are connected to the structure to be reinforced through anchoring devices respectively, at least one of the two anchoring devices is a sequential tension anchoring device, and at least one supporting device is arranged between the CFRP plate and the structure to be reinforced; wherein: the sequential tension anchoring device comprises an anchoring seat, a connecting piece and a CFRP anchor, the connecting piece is rotationally connected to the anchoring seat through a first direction pivot, the CFRP anchor is slidably connected to the connecting piece through a traction screw, a prestress adjusting mechanism is detachably arranged between the CFRP anchor and the connecting piece, the prestress adjusting mechanism is used for adjusting the sliding position of the CFRP anchor on the traction screw, and a locking nut for locking the sliding position of the CFRP anchor on the traction screw is arranged on the traction screw.

[0020] Further, the connecting piece comprises a first steering block and a mounting seat, a pin hole of the first direction pivot is arranged on the first steering block, an assembly hole of the traction screw is arranged on the mounting seat, the mounting seat is rotationally connected to the first steering block through a second direction pivot, and the central axis of the second direction pivot is perpendicular to the central axis of the first direction pivot.

[0021] Further, the CFRP anchor comprises a sliding seat and an anchor body, the sliding seat is slidably arranged on the traction screw, and the anchor body is forwardly or rearwardly hung on the sliding seat.

[0022] Further, the anchor body is forwardly hung on the sliding seat, and a channel opening for the CFRP plate to pass through is also reserved on the sliding seat.

[0023] Further, the prestress adjusting mechanism comprises a hollow jack and an abutting block, the hollow jack is sleeved on the traction screw through a fixing nut, and the abutting block is abutted between the output end of the hollow jack and the CFRP anchor.

[0024] Further, the abutting block adopts a hollow frame structure, the hollow frame structure is sleeved on the traction screw through through holes formed on two sides, the locking nut is connected on the traction screw in the hollow frame structure, and the size of the locking nut is smaller than the through hole.

[0025] Further, the CFRP anchor is one of a flat anchor, a wedge-shaped anchor or a wave-shaped anchor, and a plurality of CFRP plate anchor interfaces are arranged in the CFRP anchor.

[0026] Further, the supporting device comprises a base and a support rod, the support rod is vertically arranged on the base, the height-adjustable second turning block is arranged on the support rod through an adjusting nut, and the gap between the second turning block and the base is reserved for the CFRP plate.

[0027] Further, the supporting device comprises a base and a support rod, the support rod is fixedly connected with the structure to be reinforced through a connecting plate, the base is chamfered, and the lower part of the base is used for closely passing the CFRP plate.

[0028] Based on the structure described above, the application further provides a construction method, and the key is that the method comprises the following steps.

[0029] S1: the two ends of the CFRP plate are fixed on the structure to be reinforced through the anchoring device respectively;

[0030] S2: the supporting device is arranged between the CFRP plate and the structure to be reinforced at a predetermined interval;

[0031] S3: the prestress adjusting mechanism is installed between the CFRP anchor of the anchoring device and the connecting piece in the forward tensioning direction;

[0032] S4: the sliding position of the CFRP anchor on the traction screw is adjusted through the prestress adjusting mechanism, so that the CFRP plate applies external prestress to the structure to be reinforced;

[0033] S5: after the target prestress is reached, the CFRP anchor is locked through the locking nut;

[0034] S6: the prestress adjusting mechanism is removed.

[0035] Compared with the prior art, the application has the following remarkable effects:

[0036] 1. In the application, only a section of CFRP plate is used to realize external prestress reinforcement, so only the anchoring device needs to be arranged at the end of the section of CFRP plate, which not only greatly reduces the number of anchoring devices required for construction, but also is beneficial to simplify the process of tensioning the CFRP plate, thereby reducing the construction cost and improving the construction efficiency;

[0037] 2. The prestress adjusting mechanism mainly equipped with a jack is used to apply prestress in the transverse direction, which can realize large-tonnage construction on the one hand, and save time and effort on the other hand, and has high construction efficiency;

[0038] 3. When the application is used to reinforce the structure to be reinforced, the reinforcing material with a larger eccentricity can be arranged, which can make the CFRP plate away from the neutral axis of the structure to be reinforced, so as to improve the effect of prestress application; after the prestress adjusting mechanism tensioning the CFRP plate to the target prestress, the position of the CFRP anchor on the traction screw rod can be locked by the locking nut, so as to avoid the loss of prestress, and the construction is more convenient; at the same time, the prestress adjusting mechanism can be easily disassembled after the CFRP anchor is locked, thereby reducing the construction cost;

[0039] 4. After the prestress is applied, the oblique downward pulling force acting on the two ends of the structure to be reinforced by the anchoring device under the cooperation of the supporting device provides the negative bending moment resisting the load and the axial pressure inhibiting the crack, and the jacking force vertically transmitted by the supporting rod plays the role of elastic support, thereby solving the technical problem of the deflection of the structure to be reinforced at the midspan;

[0040] 5. In the process of applying prestress to the CFRP plate by the prestress adjusting mechanism, the CFRP anchor can be self-adaptively adjusted in the angle relative to the structure to be reinforced under the action of the first direction rotating shaft, so as to effectively cope with the stress concentration caused by the change of cross section and the change of material stiffness between the CFRP plate and the CFRP anchor, and eliminate the external force perpendicular to the plane of the CFRP plate, thereby efficiently applying prestress and preventing the brittle fracture of the CFRP plate;

[0041] 6. The CFRP anchor can be self-adaptively turned under the action of the second direction rotating shaft, so as to automatically adjust to balance during the tensioning process of the CFRP plate, the force transmission path is clear and direct, and the CFRP plate can be always ensured to be axially tensioned, thereby ensuring that the CFRP plate does not appear to be bent, and the CFRP plate is uniformly stressed, so as to avoid damage or even fracture of the CFRP plate during the tensioning process;

[0042] 7. The CFRP anchor can be freely replaced according to the actual situation of the structure to be reinforced, the reinforcement form of CFRP material and the size of prestress, thereby improving the universality of the anchoring device, and the application range is more extensive;

[0043] 8、Since the support rod is connected and fixed with the structure to be reinforced through the connecting plate, the stress area of the structure to be reinforced can be increased, the vertical load can be dispersed, and deformation or damage of the structure to be reinforced and / or the support device caused by improper local stress can be avoided;

[0044] 9、During prestress application, the second turning block can limit the CFRP plate to be bent within a certain radius of curvature, so as to avoid damage or even breakage of the CFRP plate caused by excessive bending. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0046] Figure 1 is a schematic diagram of the overall structure of embodiment one;

[0047] Figure 2 is Figure 1 is a schematic diagram of the structure of the forward tension anchoring device in the embodiment;

[0048] Figure 3 is Figure 1 is a perspective view of the forward tension anchoring device in the embodiment;

[0049] Figure 4 is a schematic diagram of the structure when the anchorage body is hung at the back;

[0050] Figure 5 is Figure 1 is a local enlarged view of part A in the embodiment;

[0051] Figure 6 is a schematic diagram of the structure when the connecting piece is a sleeve ring;

[0052] Figure 7 is a schematic diagram of the structure of embodiment two;

[0053] Figure 8 is a schematic diagram of the structure of the forward tension anchoring device in embodiment two;

[0054] Figure 9 is a flowchart of the construction method in embodiment two;

[0055] Figure 10 is Figure 9 is a state diagram of the forward tension anchoring device after the prestress adjusting mechanism is removed in the embodiment;

[0056] Figure 11 is a schematic diagram of the overall structure of embodiment three;

[0057] Figure 12 is a structural schematic diagram of the support device in Example Three;

[0058] In the figure, the reference signs are as follows: 1, structure to be reinforced; 2, CFRP plate; 3, forward tension anchoring device; 4, support device; 301, anchoring seat; 302, connecting piece; 303, CFRP anchor; 304, first direction rotating shaft; 305, traction screw; 306, prestress adjusting mechanism; 307, locking nut; 308, first direction turning block; 309, mounting seat; 310, second direction rotating shaft; 311, sliding seat; 312, anchor body; 313, channel opening; 314, hollow jack; 315, abutting block; 316, fixing nut; 317, sleeve ring; 401, base; 402, strut; 403, connecting plate; 404, support screw; 405, second direction turning block; 406, adjusting nut. DETAILED DESCRIPTION

[0059] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which examples of the embodiments are shown, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0060] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0061] Figure 1 and Figure 2The first embodiment of the application is shown: a tensioned CFRP plate 2 anchoring system, comprising a structure to be reinforced 1 and a CFRP plate 2, the two ends of the CFRP plate 2 are connected to the structure to be reinforced 1 through anchoring devices respectively, at least one of the two anchoring devices is a forward tension anchoring device 3, at least one supporting device is further arranged between the CFRP plate 2 and the structure to be reinforced 1; wherein: the forward tension anchoring device 3 comprises an anchoring seat 301, a connecting piece 302 and a CFRP anchor 303, the connecting piece 302 is rotationally connected to the anchoring seat 301 through a first direction pivot 304, the CFRP anchor 303 is slidingly connected to the connecting piece 302 through a traction screw 305, a prestress adjusting mechanism 306 is further detachably arranged between the CFRP anchor 303 and the connecting piece 302, the prestress adjusting mechanism 306 is used for adjusting the sliding position of the CFRP anchor 303 on the traction screw 305, a locking nut 307 for locking the sliding position of the CFRP anchor 303 is further arranged on the traction screw 305.

[0062] As shown in Figure 3 , the CFRP anchor 303 comprises a sliding seat 311 and an anchor body 312, the sliding seat 311 is slidingly arranged on the traction screw 305, the anchor body 312 is forwardly hung on the sliding seat 311, a passage opening 313 for the CFRP plate 2 to pass through is further reserved on the sliding seat 311. In other embodiments, the anchor body 312 can also be hung on the sliding seat 311 rearwardly, when the anchor body 312 is hung rearwardly, the passage opening 313 does not need to be reserved on the sliding seat 311 (refer to Figure 4 ).

[0063] In specific implementation, the prestress adjusting mechanism 306 comprises a hollow jack 314 and an abutting block 315, the hollow jack 314 is sleeved on the traction screw 305 through a fixing nut 316, the abutting block 315 is abutted between the output end of the hollow jack 314 and the CFRP anchor 303. As preferred, in order to facilitate the construction personnel to remove the abutting block 315 after the prestress is applied, the abutting block 315 adopts a hollow frame structure, which is sleeved on the traction screw 305 through through holes opened on two sides, the locking nut 307 is connected to the traction screw 305 in the hollow frame structure, and the size of the locking nut 307 is smaller than the through hole.

[0064] In this embodiment, the CFRP anchor 303 is one of a flat plate anchor, a wedge-shaped anchor or a wave-shaped anchor. The anchoring form can adopt one or more of adhesive anchoring, clamping anchoring or friction anchoring. As preferred, in order to meet the construction requirements of different tonnage structures, the CFRP anchor 303 can be provided with a single-layer CFRP plate 2 anchoring interface or a multi-layer CFRP plate 2 interface. It should be noted that the application object of the CFRP anchor 303 is not limited to the CFRP plate 2. In fact, according to different construction environments and different forms of the structure to be reinforced 1, the CFRP anchor 303 can also be a CFRP cable anchor, a CFRP grid anchor, etc.

[0065] From Figure 5 As can be seen, the support device includes a base 401 and a support rod 402, the support rod 402 is connected and fixed with the structure to be reinforced 1 through a connecting plate, a support screw 404 is vertically arranged on the base 401, a height-adjustable second turning block 405 is arranged on the support screw 404 through an adjusting nut 406, and a gap between the second turning block 405 and the base 401 is reserved for the CFRP plate 2 to pass through. In order to disperse the load borne by the support device and the structure to be reinforced 1 when they abut against each other, four support rods 402 are arranged in total, the upper ends of the four support rods 402 are respectively connected with the structure to be reinforced 1 through a connecting plate, and the lower ends of the four support rods 402 are connected to the base 401.

[0066] Specifically, in order to improve the stability of the system, an adhesive is applied between the CFRP plate 2 and the second turning block 405.

[0067] It should be noted that the structure to be reinforced 1 described in this embodiment is any one of a metal structure, a concrete structure, a wooden structure or a combined structure suitable for bearing load; and the form of the connecting piece 302 in this embodiment is not limited to the integral structure described above. For example, in some other embodiments, the connecting piece 302 can be a sleeve ring 317 corresponding to each traction screw 305, a pin hole of a rotating shaft is arranged at one end of the sleeve ring 317, and an assembly hole of the traction screw 305 is arranged at the other end of the sleeve ring 317 (see Figure 6 ).

[0068] Figure 7 and Figure 8The second embodiment of the application is shown, compared with the first embodiment, in order to ensure that the CFRP plate 2 is always axially tensioned, the connecting member 302 comprises a first turning block 308 and a mounting seat 309, the first turning block 308 is provided with a pin hole of the first direction turning shaft 304, the mounting seat 309 is provided with an assembly hole of the traction screw 305, the mounting seat 309 is rotationally connected with the first turning block 308 through a second direction turning shaft 310, and the central axis of the second direction turning shaft 310 is perpendicular to the central axis of the first direction turning shaft 304.

[0069] Please refer to Figure 9 , based on the foregoing description of the tensioning CFRP plate 2 anchoring system, the embodiment also discloses a construction method of the tensioning CFRP plate 2 anchoring system, comprising the following steps:

[0070] S1: The two ends of the CFRP plate 2 are respectively fixed on the structure to be reinforced 1 through the anchoring device;

[0071] S2: The support device is arranged between the CFRP plate 2 and the structure to be reinforced 1 at a predetermined interval;

[0072] S3: The prestress adjusting mechanism 306 is installed between the CFRP anchor 303 of the tensioning anchoring device 3 and the connecting member 302;

[0073] S4: The sliding position of the CFRP anchor 303 on the traction screw 305 is adjusted through the prestress adjusting mechanism 306, so as to apply external prestress to the structure to be reinforced 1 through the CFRP plate 2;

[0074] S5: After the target prestress is reached, the CFRP anchor 303 is locked through the locking nut 307;

[0075] S6: The prestress adjusting mechanism 306 is removed (for details, please refer to Figure 10 ).

[0076] Figure 11 and Figure 12 The third embodiment of the application is disclosed, which is mainly different from the first embodiment and the second embodiment in that a support device with a different structure is adopted, specifically, the support device comprises a base 401 and a support rod 402, the support rod is connected and fixed with the structure to be reinforced 1 through a connecting plate, the base 401 is chamfered, and the lower part thereof is used for allowing the CFRP plate 2 to pass through and abut against. Preferably, the contact surface between the base 401 and the CFRP plate 2 is also coated with adhesive glue.

[0077] In summary, in the present application, only one section of CFRP plate 2 is used to realize external prestress reinforcement, so only the end of the CFRP plate 2 needs to be provided with an anchoring device, which not only greatly reduces the number of anchoring devices required for construction, but also facilitates the process of tensioning the CFRP plate 2, thereby reducing construction costs and improving construction efficiency; the prestress adjusting mechanism 306 mainly equipped with a jack can apply prestress laterally, which can not only realize large-tonnage construction, but also save time and effort, and has high construction efficiency; when the present application is used to reinforce the structure to be reinforced 1, it can arrange larger eccentricity of the reinforcing material, which can not only make the CFRP plate 2 away from the neutral axis of the structure to be reinforced 1 to improve the effect of prestress application; on the other hand, after the prestress adjusting mechanism 306 tensioning the CFRP plate 2 to the target prestress, locking the position of the CFRP anchor 303 on the traction screw 305 by the locking nut 307 can avoid the loss of prestress, and the construction is more convenient; at the same time, the prestress adjusting mechanism 306 can be easily disassembled after the CFRP anchor 303 is locked, which reduces the construction cost; after the prestress application is completed, the oblique downward pulling force acting on both ends of the structure to be reinforced 1 by the anchoring device under the cooperation of the supporting device provides the negative bending moment resisting the load and the axial pressure inhibiting the crack, and the jacking force vertically transmitted by the supporting rod 402 plays the role of elastic support, which specifically solves the technical problem of mid-span deflection of the structure to be reinforced 1; during the process of the prestress adjusting mechanism 306 applying prestress to the CFRP plate 2, the CFRP anchor 303 can adaptively adjust the included angle with the structure to be reinforced 1 under the action of the first direction pivot 304, so as to effectively cope with the stress concentration between the CFRP plate 2 and the CFRP anchor 303 caused by the change of cross section and the change of material stiffness, eliminate the external force perpendicular to the plane of the CFRP plate 2, and thus prevent the brittle fracture of the CFRP plate 2 while efficiently applying prestress; the CFRP anchor 303 can be adaptively turned under the action of the second direction pivot 310, so as to automatically adjust to balance during the tensioning process of the CFRP plate 2, the force transmission path is clear and direct, and the CFRP plate 2 can be always ensured to be axially tensioned, thereby ensuring that there is no bending inside the CFRP plate 2, so that the CFRP plate 2 is uniformly stressed to avoid damage or even breakage during the tensioning process; the CFRP anchor 303 can be freely replaced according to the actual situation of the structure to be reinforced 1, the reinforcement form of the CFRP material and the size of the prestress application, thereby improving the versatility of the anchoring device and making the application range more extensive; since the supporting rod 402 is connected and fixed to the structure to be reinforced 1 through the connecting plate, the stress area of the structure to be reinforced 1 can be increased, and the vertical load can be dispersed, thereby avoiding deformation or damage of the structure to be reinforced 1 and / or the supporting device due to improper local stress; during the prestress application process, the second turning block 405 can limit the CFRP plate 2 to bend within a certain radius of curvature, thereby avoiding damage or even breakage of the CFRP plate 2 due to excessive bending.

[0078] The above merely provides the preferred embodiment of the present application, and cannot alluded the protection scope of the present application. Those skilled in the art can understand that all or part of the processes in the above embodiment can be implemented, and equivalent variations made according to the claims of the present application still belong to the scope of the present application.

Claims

1. A tensioned CFRP plate anchoring system comprising a structure to be reinforced and a CFRP plate, characterized by: The CFRP plate is connected to the structure to be reinforced through the anchoring devices at both ends, at least one of the two anchoring devices is a forward tension anchoring device, and at least one supporting device is arranged between the CFRP plate and the structure to be reinforced; wherein the forward tension anchoring device comprises an anchoring seat, a connecting piece and a CFRP anchor, the connecting piece is rotationally connected to the anchoring seat through a first direction pivot, the CFRP anchor is slidingly connected to the connecting piece through a traction screw, a prestress adjusting mechanism is detachably arranged between the CFRP anchor and the connecting piece, the prestress adjusting mechanism is used for adjusting the sliding position of the CFRP anchor on the traction screw, and a locking nut for locking the sliding position of the CFRP anchor on the traction screw is arranged on the traction screw. The connecting piece comprises a first steering block and a mounting seat, a pin hole of the first direction pivot is arranged on the first steering block, and an assembly hole of the traction screw is arranged on the mounting seat; the mounting seat is rotationally connected to the first steering block through a second direction pivot, and the central axis of the second direction pivot is perpendicular to the central axis of the first direction pivot. The CFRP anchor comprises a sliding seat and an anchor body, the sliding seat is slidingly arranged on the traction screw, and the anchor body is forwardly or rearwardly hung on the sliding seat. The anchor body is forwardly hung on the sliding seat, and a channel opening for the CFRP plate to pass through is reserved on the sliding seat. The prestress adjusting mechanism comprises a hollow jack and an abutting block, the hollow jack is sleeved on the traction screw through a fixing nut, and the abutting block is abutted between the output end of the hollow jack and the CFRP anchor. The abutting block adopts a hollow frame structure, is sleeved on the traction screw through through holes opened on two sides, the locking nut is connected to the traction screw in the hollow frame structure, and the size of the locking nut is smaller than that of the through hole.

2. The tensioned CFRP sheet anchorage system according to claim 1, characterized by: The CFRP anchor is one of a flat anchor, a wedge-shaped anchor or a wave-shaped anchor, and a plurality of CFRP plate anchor interfaces are arranged in the CFRP anchor.

3. The tensioned CFRP sheet anchorage system according to claim 1 or 2, characterized in that: The supporting device comprises a base and a support rod, the support rod is fixedly connected to the structure to be reinforced through a connecting plate, a support screw is vertically arranged on the base, a second steering block with adjustable height is arranged on the support screw through an adjusting nut, and a gap reserved between the second steering block and the base is used for the CFRP plate to pass through.

4. The tensioned CFRP sheet anchorage system according to claim 1 or 2, characterized by: The supporting device comprises a base and a support rod, the support rod is fixedly connected to the structure to be reinforced through a connecting plate, and the base is chamfered, and the lower part of the base is used for the CFRP plate to pass through closely.

5. The method of installing a tensioned CFRP sheet anchoring system according to any one of claims 1 to 4, wherein The method comprises the following steps: S1: fixing the CFRP plate at both ends to the structure to be reinforced through the anchoring devices; S2: arranging the supporting device between the CFRP plate and the structure to be reinforced at a predetermined interval; S3: installing the prestress adjusting mechanism between the CFRP anchor and the connecting piece of the forward tension anchoring device. S4: adjust the sliding position of the CFRP anchor on the traction screw through the prestress adjusting mechanism to apply external prestress on the structure to be reinforced through the CFRP plate; S5: after reaching the target prestress, lock the CFRP anchor through the locking nut; S6: remove the prestress adjusting mechanism.

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