Multi-layer carbon plate collaborative tensioning system and its tensioning construction method

Abstract

The present invention provides a multi-layer carbon plate cooperative tensioning system and a tensioning construction method thereof. The multi-layer carbon plate cooperative tensioning system includes a fixed-end anchor, a tensioning-end anchor, and N carbon plates spaced up and down; N fixed-end anchoring positions are spaced up and down on the fixed-end anchor; the tensioning-end anchor includes a tensioning seat and N stress adjusting structures connected to the tensioning seat, and each stress adjusting structure is provided with a tensioning-end anchoring position; one end of each carbon plate is connected to one of the fixed-end anchoring positions, and the other end is connected to the corresponding tensioning-end anchoring position; wherein, N is an integer and N≥2, each stress adjusting structure is respectively used to adjust the tensile force on each carbon plate, and the tensioning seat is used to synchronously tension each carbon plate under the action of an external force. The multi-layer carbon plate cooperative tensioning system and the tensioning construction method provided by the present invention are simple and safe in construction, can improve the force balance of each layer of carbon plates, and thus improve the quality of reinforcement construction.

Description

Technical Field

[0001] The invention belongs to the technical field of building reinforcement, and particularly relates to a multi-layer carbon plate cooperative tensioning system and a tensioning construction method thereof. Background Art

[0002] The technology of prestressing carbon fiber plates to reinforce buildings is a mature technology that can improve the bearing capacity of buildings (usually bridges). For long-span bridges, higher tensile force values are required during reinforcement design. For some narrow beams, limited space at the bottom of the bridge, or situations where ultra-high tensile forces are needed, simply increasing the tensile force value from the perspective of a single prestressed carbon fiber plate has limited effect, and this method will also significantly increase the risk of carbon fiber plate de-anchoring, posing a great threat to safety. Currently, the main method to increase the overall tensile force value is to increase the number of carbon fiber plates to form a tensioning system. According to the actual installation conditions, two carbon plate distribution methods, namely, laying flat and stacking, can be adopted.

[0003] For the tensioning method with multiple carbon plates laid flat, not only is the requirement for the tensioning area large and it is not applicable to the reinforcement and repair of narrow beams, but also the distribution of the tensile stress between each carbon plate is difficult to balance, and the carbon plate is extremely prone to wire breakage and damage. By adopting the tensioning method with multiple carbon plates stacked, the occupied area of the tensioning system can be reduced, which is beneficial to making the force of the entire tensioning and anchoring system more concentrated. However, there are still problems in the current process of forming and tensioning the stacked carbon plates: when the length control of cutting the carbon plates according to the construction requirements is poor, it has a great impact on the force balance between each layer of carbon plates, and it is impossible to maximize the tensile stress of all carbon plates, affecting the reinforcement quality. The difference in tensile stress generated due to the different working section lengths between each layer of carbon plates will increase the risk of de-anchoring, increase the construction difficulty, and be accompanied by greater potential safety hazards. Summary of the Invention

[0004] The embodiment of the invention provides a multi-layer carbon plate cooperative tensioning system and a tensioning construction method thereof, aiming to solve the problems of large construction difficulty and high risk in multi-layer carbon plate tensioning, improve the force balance of each layer of carbon plates, and thus improve the reinforcement construction quality.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: In the first aspect, a multi-layer carbon plate cooperative tensioning system is provided, which includes a fixed-end anchor, a tensioning-end anchor, and N carbon plates spaced up and down; N fixed-end anchor connection positions are spaced up and down on the fixed-end anchor; the tensioning-end anchor includes a tensioning seat and N stress adjustment structures connected to the tensioning seat. Each stress adjustment structure is provided with a tensioning-end anchor connection position, and each tensioning-end anchor connection position corresponds to each fixed-end anchor connection position one by one; one end of each carbon plate is connected to one of the fixed-end anchor connection positions, and the other end is connected to the corresponding tensioning-end anchor connection position; where N is an integer and N≥2, and each stress adjustment structure is respectively used to adjust the tensile force on each carbon plate, and the tensioning seat is used to synchronously tension each carbon plate under the action of an external force.

[0006] In combination with the first aspect, in a possible implementation manner, the fixed-end anchor includes N first fixed anchor heads with fixed-end anchor connection positions stacked and fixed up and down; a sliding cavity penetrating along the axial direction of the carbon plate is provided on the tensioning seat; the stress adjustment structure includes N first tensioning anchor heads and N baffles; among them, the N first tensioning anchor heads are stacked and slidably embedded in the sliding cavity along the axial direction of the carbon plate. Each first tensioning anchor head is provided with a tensioning-end anchor connection position. Tensioning screws are provided on both sides of the first tensioning anchor head at the tensioning-end anchor connection position, and the tensioning screws extend in a direction away from the fixed-end anchor; the N baffles abut against the side wall of the tensioning seat facing away from the fixed-end anchor and are respectively flush with each first tensioning anchor head; the extending ends of each tensioning screw respectively pass through the corresponding baffle and are screwed with an adjusting nut.

[0007] In combination with the first aspect, in a possible implementation manner, the fixed-end anchor includes M first fixed anchor heads and M - 1 second fixed anchor heads stacked and fixed up and down. Fixed-end anchor connection positions are provided on both the first fixed anchor heads and the second fixed anchor heads. Among them, a first through groove suitable for the carbon plate to pass through is provided between the stacked surfaces of adjacent first fixed anchor heads. Each second fixed anchor head is located on the side of the first fixed anchor head facing away from the tensioning-end anchor and is respectively flush with each first through groove; a sliding cavity penetrating along the axial direction of the carbon plate is provided on the tensioning seat. The stress adjustment structure includes M first tensioning anchor heads, M - 1 second tensioning anchor heads, and a tensioning bracket; the M first tensioning anchor heads are stacked and slidably embedded in the sliding cavity along the axial direction of the carbon plate. A second through groove suitable for the carbon plate to pass through is provided between the overlapping surfaces of adjacent first tensioning anchor heads; the M - 1 second tensioning anchor heads are located on the side of the first tensioning anchor head facing away from the fixed-end anchor and are respectively flush with each second through groove; the tensioning bracket is fixedly connected to the side of the tensioning seat facing away from the fixed-end anchor; where 2M - 1 = N, N≥3 and N is an odd number. Tensioning screws are provided on both sides of the first tensioning anchor heads and the second tensioning anchor heads at the tensioning-end anchor connection positions. Each tensioning screw passes through the tensioning bracket along the axial direction of the carbon plate and is screwed with an adjusting nut.

[0008] Exemplarily, the tensioning bracket includes a first connecting plate and M-1 second connecting plates; the first connecting plate abuts against the side wall of the tensioning seat away from the fixed end anchor, and two rows of support arms are horizontally spaced apart on the first connecting plate, the two rows of support arms are symmetrically distributed on both sides of the second tensioning anchor head, and each row includes M-1 support arms spaced apart up and down; the M-1 second connecting plates correspond one by one to each second tensioning anchor head, and abut against the end walls of the corresponding two support arms, respectively; wherein the tensioning screws on each first tensioning anchor head pass through the first connecting plate and are screwed on the adjusting nut, and the tensioning screws on each second tensioning anchor head pass through the second connecting plate and are screwed on the adjusting nut.

[0009] For example, a support frame is provided between the first fixed anchor head and the second fixed anchor head, one side of the support frame abuts against each first fixed anchor head, and the other side abuts against each second fixed anchor head, and the support frame has a third through groove or through hole suitable for the carbon plate to pass through.

[0010] The beneficial effect of the multi-layer carbon plate cooperative tensioning system provided by the present invention is that compared with the prior art, in the multi-layer carbon plate cooperative tensioning system of the present invention, two or more carbon plates can be sequentially stacked and connected to the fixed end anchor and the tensioning end anchor, and the tensioning force value of each carbon plate can be adjusted one by one through each stress adjustment structure, and then the tensioning force value on each carbon plate is adjusted to within the target deviation range, thereby avoiding the problem that each carbon plate cannot be evenly stressed due to the difference in cutting length. After the adjustment is completed, the tensioning force is applied to the tensioning seat through the tensioning tooling, so that each carbon plate is coordinated until the tensioning force design value is reached, and the construction method is simple. Since each carbon plate can be evenly stressed, the tensioning stress of all carbon plates can be maximized, the reinforcement quality can be improved, and the risk of de-anchoring caused by uneven stress on each carbon plate can be avoided, thereby improving construction safety.

[0011] In a second aspect, an embodiment of the present invention further provides a tensioning construction method, which uses the above-mentioned multi-layer carbon plate to coordinate the tensioning system to perform operations, including:

[0012] Step S100, calculating and obtaining the carbon plate specifications and number of layers of the multi-layer carbon plate cooperative tensioning system according to the tensioning stress requirement, and cutting the carbon plates produced in the same batch according to the required length;

[0013] Step S200, fixing the cut carbon plates on the fixed end anchor and the tension end anchor in sequence, wherein the two ends of the carbon plates are connected to the corresponding fixed end anchor and tension end anchor respectively;

[0014] Step S300, drilling holes and planting reinforcement at the adjustment site to fix the tension support and the fixed support, connecting and fixing the fixed end anchor to the fixed support, and connecting and fixing the tension seat to the tension support;

[0015] Step S400: Apply tensile force to the tension support, and then adjust each stress adjustment structure in sequence so that the deviation of the tensile force values on each carbon plate is within the required range;

[0016] Step S500: Mark the layer positions of each layer of carbon plates and the anchoring positions at both ends of each layer of carbon plates, and determine the target adjustment positions of each stress adjustment structure;

[0017] Step S600: Remove each layer of carbon plates from the fixed-end anchor and the tension-end anchor in sequence, pack them in strips and transport them to the construction site. Reassemble each layer of carbon plates according to the marked layer positions and anchoring positions. After adjusting each stress adjustment structure to the marked target adjustment positions, perform synchronous tensioning of multiple layers of carbon plates according to the construction requirements and processes.

[0018] Combined with the second aspect, in a possible implementation manner, Step S400 includes:

[0019] Apply a tensile force of 2 to 5 tons to the tension support;

[0020] Use the tensioning tooling to synchronously tension the tensioning screws on each stress adjustment structure in sequence. The tensile force is controlled at 10% - 30% of the designed tensile strength value of the carbon plate, and the deviation value of the tensile force received by each carbon plate is controlled to be less than 1 ton;

[0021] After tensioning in place, lock the adjusting nuts on each tensioning screw.

[0022] In some embodiments, in Step S500, the target adjustment position of the adjusting nut is obtained by marking the locking positions of each adjusting nut on the corresponding tensioning screw.

[0023] Exemplarily, in Step S200, connecting the two ends of the carbon plate to the corresponding fixed-end anchoring position and tension-end anchoring position respectively includes:

[0024] Fix the first wedge block and the second wedge block at both ends of the carbon plate respectively. The distance between the first wedge block and the second wedge block matches the length of the tensioning working section of the carbon plate;

[0025] Clamp the end of the carbon plate with the first wedge block into the fixed-end anchoring position, and clamp the end of the carbon plate with the second wedge block into the tension-end anchoring position;

[0026] Among them, both the fixed-end anchoring position and the tension-end anchoring position are trapezoidal holes, and the inclined surface of the trapezoidal hole abuts against the wedge-shaped surface of the first wedge block or the second wedge block.

[0027] For example, in Step S600, before reassembling each layer of carbon plates according to the marked layer positions and anchoring positions, it further includes: applying an adhesive to the plate surface of the outermost layer of carbon plate facing the surface to be strengthened, and applying the adhesive to both sides of the remaining layers of carbon plates.

[0028] The beneficial effects of the tension construction method provided by the present invention are as follows: Compared with the prior art, in the tension construction method of the present invention, the above-mentioned multi-layer carbon plate cooperative tensioning system is used for construction operations. Before on-site construction operations, each carbon plate can be calibrated and marked in the calibration site in advance. After the calibration and marking are completed, each carbon plate can be disassembled and rolled for transportation, reducing the transportation difficulty and cost. During on-site construction, as long as it is reassembled according to the calibration marks, the tension stress balance between each carbon plate can be ensured. After the overall tension operation is completed according to the normal construction requirements and processes, the tensioning capacity of each layer of carbon plate can be fully exerted, improving the quality of tension reinforcement construction. Moreover, the construction process is simple in operation, and the risk of anchor detachment caused by uneven force between each carbon plate can be avoided, thereby improving construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional structural schematic diagram of the multi-layer carbon plate cooperative tensioning system provided in the first embodiment of the present invention;

[0030] Figure 2 It is a front view structural schematic diagram of the multi-layer carbon plate cooperative tensioning system provided in the second embodiment of the present invention;

[0031] Figure 3 Along Figure 2 The cross-sectional structural schematic diagram of the A-A line in;

[0032] Figure 4 It is a step block diagram of the tension construction method provided in the embodiment of the present invention.

[0033] In the figure: 10, fixed-end anchor; 101, fixed-end anchoring position; 11, first fixed anchor head; 111, first through groove; 12, second fixed anchor head; 13, support bracket; 20, tensioning-end anchor; 201, tensioning-end anchoring position; 21, tensioning seat; 211, sliding cavity; 22, stress adjustment structure; 221, first tensioning anchor head; 2211, second through groove; 222, baffle; 223, tensioning screw; 224, adjusting nut; 23, second tensioning anchor head; 24, tensioning bracket; 241, first connecting plate; 242, support arm; 243, second connecting plate; 30, carbon plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Please refer to Figures 1 to 3, the multi-layer carbon plate cooperative tensioning system provided by the present invention will be described below. The multi-layer carbon plate cooperative tensioning system includes a fixed-end anchor 10, a tensioning-end anchor 20, and N carbon plates 30 spaced up and down; N fixed-end anchor connection positions 101 are spaced up and down on the fixed-end anchor 10; the tensioning-end anchor 20 includes a tensioning seat 21 and N stress adjustment structures 22 connected to the tensioning seat 21. Each stress adjustment structure 22 is provided with a tensioning-end anchor connection position 201, and each tensioning-end anchor connection position 201 corresponds to each fixed-end anchor connection position 101 one by one; one end of each carbon plate 30 is connected to one of the fixed-end anchor connection positions 101, and the other end is connected to the corresponding tensioning-end anchor connection position 201; where N is an integer and N≥2, each stress adjustment structure 22 is used to adjust the tension force on each carbon plate 30, and the tensioning seat 21 is used to synchronously tension each carbon plate 30 under an external force.

[0036] It should be noted that in this embodiment, each layer of carbon plates 30 used should be carbon fiber plates produced in the same batch, and it is ensured that the modulus difference of each carbon plate 30 is not higher than ±5 GPa; the connection methods of the two ends of the carbon plate 30 to the fixed-end anchor connection position 101 and the tensioning-end anchor connection position 201 can be selected according to actual needs, such as waveform anchors, mechanical anchoring, adhesive bonding, etc. In actual construction, both the fixed-end anchor 10 and the tensioning-end anchor 20 should be connected to the corresponding supports, and the supports are usually fixed to the position to be strengthened by anchoring. During the tensioning construction, a tensioning force is applied to the tensioning-end anchor 20 through a tensioning tooling, so that the tensioning anchor slides on the tensioning-end support.

[0037] Compared with the prior art, the multi-layer carbon plate cooperative tensioning system provided in this embodiment enables two or more carbon plates 30 to be sequentially and spacedly stacked and connected to the fixed-end anchor 10 and the tensioning-end anchor 20. Through each stress adjustment structure 22, the tension force values of each carbon plate 30 can be adjusted one by one, and then the tension force values of each carbon plate 30 are adjusted within the target deviation range, so as to avoid the problem that each carbon plate 30 cannot be evenly stressed due to the difference in cutting length. After the adjustment is completed, a tensioning force is applied to the tensioning seat 21 through a tensioning tooling, so that each carbon plate 30 is stressed cooperatively until the designed tension force value is reached. The construction method is simple. Since each carbon plate 30 can be evenly stressed, the tension stress of all carbon plates 30 can be maximized, the reinforcement quality can be improved, and the risk of anchor detachment caused by uneven stress of each carbon plate 30 can be avoided, thereby improving the construction safety.

[0038] In some embodiments, refer to Figure 1, the fixed-end anchor 10 includes N first fixed anchor heads 11 that are stacked and fixed up and down and are provided with fixed-end anchoring positions 101; a sliding cavity 211 that penetrates along the axial direction of the carbon plate 30 is provided on the tensioning seat 21; the stress adjustment structure 22 includes N first tensioning anchor heads 221 and N baffles 222; among them, the N first tensioning anchor heads 221 are stacked and slidably embedded in the sliding cavity 211 along the axial direction of the carbon plate 30 together, and a tensioning-end anchoring position 201 is provided on each first tensioning anchor head 221. Tensioning screws 223 are provided on both sides of the first tensioning anchor head 221 at the tensioning-end anchoring position 201, and the tensioning screws 223 extend in a direction away from the fixed-end anchor 10; the N baffles 222 abut against the side wall of the tensioning seat 21 facing away from the fixed-end anchor 10 and are respectively flush with the corresponding first tensioning anchor heads 221; the extending ends of the respective tensioning screws 223 respectively pass through the corresponding baffles 222 and are screwed with adjusting nuts 224.

[0039] It should be understood that based on the fact that there is a sliding contact between each layer of carbon plates 30 and between the outer carbon plate 30 and the cavity wall of the sliding cavity 211, it can be realized that each of the stacked first tensioning anchor heads 221 can slide independently along the axial direction of the carbon plate 30 in the sliding cavity 211. When individually adjusting the tensile forces of each carbon plate 30 (this is the initial tensioning stage at this time, and the tensioning force is relatively small), it can be directly adjusted by screwing the adjusting nut 224 on the corresponding tensioning screw 223, or a tensioning tool can be used to apply a tensioning force to the corresponding tensioning screw 223 and lock the adjusting nut 224 (that is, the adjusting nut 224 abuts against the baffle 222) when the tensioning reaches the target force value. Relatively speaking, the latter method is more labor-saving. After pre-tensioning each carbon plate 30 in turn and adjusting it within a reasonable range of tensile force value differences, synchronous tensioning of multiple carbon plates 30 can be carried out, that is, a tensioning tool is used to simultaneously apply a tensioning force to each tensioning screw 223, or a tensioning force is directly applied to the tensioning seat 21, so that the force is transmitted to the tensioning ends of each carbon plate 30 through each first tensioning anchor head 221, and the adjustment process is convenient and flexible.

[0040] In some other embodiments, please refer to Figure 2 and Figure 3The fixed-end anchor 10 includes M first fixed anchor heads 11 and M-1 second fixed anchor heads 12 stacked and fixed in an upper and lower manner, and a fixed-end anchoring position 101 is provided on each of the first fixed anchor heads 11 and the second fixed anchor heads 12, wherein a first through groove 111 suitable for the passage of the carbon plate 30 is provided between the stacking surfaces of each adjacent first fixed anchor head 11, and each second fixed anchor head 12 is located on the side of the first fixed anchor head 11 away from the tensioning-end anchor 20, and is flush with each first through groove 111 respectively; a sliding cavity 211 penetrating along the axial direction of the carbon plate 30 is provided on the tensioning seat 21, and the stress adjustment structure 22 includes M first tensioning anchor heads 221, M-1 second tensioning anchor heads 23, and a tensioning bracket 24; M first tensioning anchor heads 221 are stacked It is arranged and slidably embedded in the sliding cavity 211 along the axial direction of the carbon plate 30, and a second through groove 2211 suitable for the carbon plate 30 to pass through is provided between the overlapping surfaces of each adjacent first tensioning anchor head 221; M-1 second tensioning anchor heads 23 are located on the side of the first tensioning anchor head 221 away from the fixed end anchor 10, and are respectively flush with each second through groove 2211; the tensioning bracket 24 is fixedly connected to the side of the tensioning seat 21 away from the fixed end anchor 10; wherein, 2M-1=N, N≥3 and N is an odd number, tensioning screws 223 are provided on both sides of the tensioning end anchor position 201 on the first tensioning anchor head 221 and the second tensioning anchor head 23, and each tensioning screw 223 passes through the tensioning bracket 24 along the axial direction of the carbon plate 30 and is screwed with an adjusting nut 224.

[0041] It should be understood that the final structure formed by the tensioning of the multiple layers of carbon plates is that the outer carbon plate 30 is bonded to the surface to be reinforced as a whole, and each layer of carbon plates 30 is also bonded to each other as a whole. Usually, the final bonding layer formed between the carbon plates 30 is less than 10 mm. Under normal circumstances, due to the thickness of the anchor head anchored to the end of the carbon plate 30, the end gap between adjacent carbon plates 30 is at least 20 mm. Before tensioning, it is necessary to first press the middle area of ​​each carbon plate 30 through a baffle bar anchored on the surface to be reinforced to reduce the gap between the carbon plates 30, thereby reducing the thickness of the bonding layer. Therefore, the larger the end gap between each layer of carbon plates 30, the greater the degree of bending of the outer carbon plate 30 due to the baffle bar during construction, thereby generating a higher risk of splitting and unanchoring of the carbon plate 30. In this case, the smaller the end gap between the carbon plates 30, the lower the bending degree of the outer carbon plate 30, and the more it can promote the concentrated and balanced force of each layer of carbon plates 30.

[0042] Taking N = 3 as an example for illustration, the principles of the fixed end and the tension end are the same. Here, for the tension end, the tensioning system composed of three layers of carbon plates 30 requires two first tensioning anchor heads 221 and one second tensioning anchor head 23. Among them, the two first tensioning anchor heads 221 are stacked and slidably embedded in the sliding cavity 211 and respectively anchor two outer-layer carbon plates 30. By using the second through groove 2211 structure between the two first tensioning anchor heads 221 (the second through groove 2211 can actually be formed by enclosing grooves respectively opened on the mutually contacting walls of the two first tensioning anchor heads 221), the middle carbon plate 30 can pass through and be anchored to the second tensioning anchor head 23. At this time, it is equivalent to adding another layer of carbon plate 30 between the conventional stacked structure of two layers of carbon plates 30. Therefore, the distance between adjacent carbon plates 30 can be reduced by about half, thereby greatly improving the force balance of each layer of carbon plates 30 during the tensioning process, promoting the concentration of the tension force, and reducing the risks of bending and splitting of the carbon plates 30 and tensioning and de-anchoring.

[0043] In addition, it should be noted that the function of the tensioning bracket 24 is to realize the staggered distribution of the first tensioning anchor head 221 and the second tensioning anchor head 23 along the axial direction of the carbon plate 30. Of course, for the fixed end, the two first fixed anchor heads 11 and a tensioning anchor head also need to be staggeredly arranged. Since the fixed end only needs to realize the anchoring and fixing of the end of the carbon plate 30, the second fixed anchor head 12 can be directly or indirectly abutted against the ends of the two first fixed anchor heads 11. Specifically, refer to Figure 1 , in this embodiment, a support bracket 13 is provided between the first fixed anchor head 11 and the second fixed anchor head 12. One side of the support bracket 13 abuts against each first fixed anchor head 11, and the other side abuts against each second fixed anchor head 12. The support bracket 13 has a third through groove or through hole suitable for the carbon plate 30 to pass through. By providing the support bracket 13, the end of the carbon plate 30 extending out of the anchor head can be avoided. Its structure can be H-shaped, or mouth-shaped, or sun-shaped, etc., as long as it can abut against the end walls of the first fixed anchor head 11 and the second fixed anchor head 12 that are close to each other, and at the same time can allow the end of the middle-layer carbon plate 30 to pass through.

[0044] As a specific implementation manner of the above tensioning bracket 24, please refer to Figure 2 and Figure 3The tensioning bracket 24 includes a first connecting plate 241 and M-1 second connecting plates 243; the first connecting plate 241 abuts against the side wall of the tensioning seat 21 away from the fixed end anchor 10, and two rows of support arms 242 are horizontally spaced apart on the first connecting plate 241, and the two rows of support arms 242 are symmetrically distributed on both sides of the second tensioning anchor head 23, and each row includes M-1 support arms 242 spaced apart from each other; the M-1 second connecting plates 243 correspond to each second tensioning anchor head 23 one by one, and abut against the end walls of the corresponding two support arms 242 respectively; wherein, the tensioning screws 223 on each first tensioning anchor head 221 all pass through the first connecting plate 241 and are screwed on the adjusting nut 224, and the tensioning screws 223 on each second tensioning anchor head 23 all pass through the second connecting plate 243 and are screwed on the adjusting nut 224.

[0045] Still taking N=3 as an example, since the first connecting plate 241 directly abuts against the side wall of the tensioning seat 21, in order to meet the connection between the middle carbon plate 30 and the second tensioning anchor head 23, the first connecting plate 241 should have an avoidance hole suitable for the passage of the carbon plate 30. The adjusting nuts 224 on the two tensioning screws 223 on the two first tensioning anchor heads 221 abut against the first connecting plate 241, so that the tension connection of the two outer carbon plates 30 can be achieved. The two tensioning screws 223 in the middle pass through the second tensioning anchor heads 221. The connecting plate 243 is rearwardly screwed onto the adjusting nut 224, and the abutting relationship between the second connecting plate 243 and the corresponding two supporting arms 242 can be used to achieve the tensioning connection of the middle layer of carbon plate 30. The second tensioning anchor head 23 can be accommodated between the two supporting arms 242. The structure is stable and reliable, and the tensioning force of each layer of carbon plate 30 can be adjusted separately. The synchronous tensioning of the three carbon plates 30 can also be achieved through the connection relationship between the tensioning bracket 24 and the two first tensioning anchor heads 221 and the second tensioning anchor head 23.

[0046] Based on the same inventive concept, Figures 1 to 4 It is understood that the embodiment of the present application also provides a tensioning construction method, which uses the above-mentioned multi-layer carbon plate to cooperate with the tensioning system to perform operations, including:

[0047] Step S100, calculating and obtaining the carbon plate specifications and number of layers of the multi-layer carbon plate cooperative tensioning system according to the tensioning stress requirement, and cutting the carbon plates 30 produced in the same batch according to the required length.

[0048] Specifically, if the length of the bridge to be reinforced that needs to be tensioned is 20 meters, three layers of carbon plates 30 need to be used simultaneously to achieve the designed tension force, then it is necessary to use the carbon plates 30 produced in the same batch and cut at least three strips according to the length of 20 meters for backup.

[0049] Step S200: Fix each cut carbon plate 30 to the fixed-end anchor 10 and the tension-end anchor 20 in sequence. The two ends of the carbon plate 30 are respectively connected to the corresponding fixed-end anchoring position 101 and the tension-end anchoring position 201.

[0050] Specifically, the fixing method of the end of the carbon plate 30 and the anchor can be any form such as a corrugated anchor, a mechanical anchor, an adhesive bonding anchor, etc., which is not limited here. However, it should be understood that no matter which method is adopted, the ends of each layer of carbon plate 30 should be aligned as much as possible during fixation.

[0051] Step S300: Drill and implant reinforcing bars at the calibration site to fix the tension support and the fixed support, and connect and fix the fixed-end anchor 10 to the fixed support and the tension seat 21 to the tension support.

[0052] That is to say, the process of fine-tuning the tensile force of each layer of carbon plate 30 to obtain the corresponding marks is carried out at the calibration site (carbon plate 30 processing factory), rather than at the construction site. Among them, the tension support and the fixed support, including the tensioning tooling required for the tensioning process, are common components in the industry. For example, the fixed support and the tension support can be a frame or a plate anchored at the target position. For the tensioning tooling, it can have different structures, but the structural principle is the same. It is to use a top plate with a perforation to sleeve on the tensioning screw 223 corresponding to each carbon plate 30, and then apply a load to the top plate through a jack for tensioning. Of course, for this embodiment, since both the tensioning adjustment of a single carbon plate 30 and the synchronous tensioning of multiple carbon plates 30 need to be carried out, a lock nut can be screwed on the two tensioning screws 223 in the middle layer on the side opposite to the adjusting nut 224. The lock nut and the adjusting nut 224 are used to jointly clamp the second connecting plate 243. When adjusting a single carbon plate 30, the lock nut is loosened. When performing synchronous tensioning, the lock nut is tightened. Then, only by connecting the tensioning tooling to the two tensioning screws 223 in the middle layer, the coordinated force of each carbon plate 30 can be realized through the force transmission of the second connecting plate 243, the support arm 242, and the first connecting plate 241, and each lock nut can be locked after the tensioning is in place.

[0053] Step S400: Apply a tensile force to the tension support, and then adjust each stress adjustment structure 22 in sequence to make the deviation of the tensile force values on each carbon plate 30 within the required range.

[0054] Applying a tensile force to the tension support here is equivalent to a pre-tensioning process, aiming to straighten each layer of carbon plate 30. Under the action of the applied tensile force, the stress adjustment structure 22 is used to adjust the force of each carbon plate 30, so as to improve the force balance of each layer of carbon plate 30 during the subsequent overall tensioning.

[0055] Step S500: Mark the layer positions of each layer of carbon plate 30 and the anchoring positions at both ends of each layer of carbon plate 30, and determine the target adjustment positions of each stress adjustment structure 22.

[0056] It should be noted that to avoid covering the marks with the subsequent applied adhesive, the layer positions of each layer of carbon plate 30 can be directly marked by punching points on the end wall of the carbon plate 30. As for the anchoring positions at both ends of each layer of carbon plate 30, if the carbon plate 30 and the anchor head of the anchor are fixed by bonding, there is no need to remove them during transportation, and the bonding position itself is equivalent to the marked position. As for the target adjustment position, as long as it can be ensured that when reassembling after disassembly, the stress adjustment structure 22 can be reset to the position adjusted in place in step S400. The purpose is to reduce the detection process of the pre-tensioning force on each layer of carbon plate 30 during the assembly of each layer of carbon plate 30 during construction, reduce the construction operation difficulty and improve the construction efficiency.

[0057] Step S600: Remove each layer of carbon plate 30 from the fixed-end anchor 10 and the tension-end anchor 20 in sequence, pack them in strips and transport them to the construction site. Reassemble each layer of carbon plate 30 according to the marked layer positions and anchoring positions. After adjusting each stress adjustment structure 22 to the marked target adjustment position, perform synchronous tensioning of multiple layers of carbon plates according to the construction requirement process.

[0058] In this embodiment, since it can be disassembled and transported separately, each carbon plate 30 can be separately packed into a roll. Compared with the conventional method that after the multi-layer carbon plates are assembled in the processing factory, they can only be transported as a whole and cannot be rolled, it can greatly reduce the transportation difficulty and cost. Compared with the conventional method of transporting single plates to the site and then assembling them, it can save the on-site assembly time, improve the construction efficiency, and ensure the force balance between each layer of carbon plate 30.

[0059] The tensioning construction method provided in this embodiment, compared with the prior art, uses the above multi-layer carbon plate cooperative tensioning system for construction operations. Before on-site construction operations, each carbon plate 30 can be pre-adjusted and marked on the calibration site. After the calibration and marking are completed, each carbon plate 30 can be disassembled and rolled for transportation, reducing the transportation difficulty and cost. During on-site construction, only by reassembling according to the calibration marks can it be ensured that the tension stresses between each carbon plate 30 are balanced. After the overall tensioning operation is completed according to the normal construction requirement process, the tensioning capacity of each layer of carbon plate 30 can be fully exerted, improving the construction quality of tensioning and reinforcement. Moreover, the construction process is simple in operation, and the risk of anchor detachment caused by uneven forces between each carbon plate 30 can be avoided, thereby improving the construction safety.

[0060] Specifically, step S400 of this embodiment includes: applying a tensile force of 2 to 5 tons to the tension bearing; synchronously tensioning the tensioning screws 223 on each stress adjustment structure 22 in sequence by using a tensioning tooling, with the tensile force controlled within 10% to 30% of the designed tensile strength value of the carbon plate 30, and controlling the deviation value of the tensile force received by each carbon plate 30 to be less than 1 ton; after the tensioning is in place, locking the adjusting nuts 224 on each tensioning screw 223.

[0061] It should be understood that in this embodiment, the tensioning in place means that the tensile stress of each carbon plate 30 meets 10% to 30% of its designed tensile strength value, and the stress deviation value between carbon plates 30 is less than 1 ton. In step S500 of this embodiment, by marking the locking positions of each adjusting nut 224 on the corresponding tensioning screw 223, the target adjustment position of the adjusting nut 224 is obtained.

[0062] It should be noted that in step S200 of this embodiment, connecting the two ends of the carbon plate 30 to the corresponding fixed-end anchoring position 101 and tension-end anchoring position 201 respectively includes: fixing a first wedge block and a second wedge block at the two ends of the carbon plate 30 respectively, and the distance between the first wedge block and the second wedge block matches the length of the tension working section of the carbon plate 30; clamping the end of the carbon plate 30 with the first wedge block into the fixed-end anchoring position 101, and clamping the end of the carbon plate 30 with the second wedge block into the tension-end anchoring position 201; wherein, both the fixed-end anchoring position 101 and the tension-end anchoring position 201 are trapezoidal holes, and the inclined surface of the trapezoidal hole abuts against the wedge-shaped surface of the first wedge block or the second wedge block.

[0063] Among them, the first wedge block and the second wedge block are fixed to the end of the carbon plate 30 by means of adhesive bonding. The position of this fixation only needs to be determined by designing the working section length, and there is no requirement for position accuracy. After the tensile stress of each layer of carbon plate 30 is adjusted in place through step S400, only the screwing position (i.e., the target adjustment position) of the corresponding adjusting nut 224 on the tensioning screw 223 needs to be marked. During the process of disassembling, installing and packing the carbon plate 30 in step S600, it is not necessary to remove each first wedge block and second wedge block, and the anchoring and assembly can be directly carried out on site, with simple and efficient operation.

[0064] For example, in step S600, before reassembling each layer of carbon plate 30 according to the marked layer positions and anchoring positions, it further includes: applying an adhesive to the plate surface of the outermost layer of carbon plate 30 facing the surface to be strengthened, and applying adhesives to both sides of the remaining layers of carbon plates 30.

[0065] Since each carbon plate 30 is in a split state, it is possible to apply glue to each carbon plate 30 separately before tensioning. Due to the split state, each carbon plate 30 can be subjected to simultaneous glue application operations, thus saving construction time and improving construction efficiency. When applying glue, it is necessary to target the layer markings. Since the outer surface of the carbon plate 30 actually anchored in the outermost layer does not need to be bonded, only the outer carbon plate 30 needs to be coated with glue on one side, and the remaining carbon plates 30 are coated with glue on both sides. In addition, it should be noted that the glue applied is usually a special epoxy AB glue, and its elongation rate should be consistent with the tensile elongation rate of the carbon plate 30 itself.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. Multi-layer carbon plate coordinated tensioning system, It is characterized in that include: The fixed end anchor has N fixed end anchoring positions spaced apart in the upper and lower parts; The tensioning end anchorage comprises a tensioning seat and N stress adjustment structures connected to the tensioning seat, each of the stress adjustment structures is provided with a tensioning end anchoring position, and each of the tensioning end anchoring positions corresponds to each of the fixed end anchoring positions one by one; N carbon plates are spaced apart vertically, one end of each carbon plate is connected to one of the fixed end anchoring positions, and the other end is connected to the corresponding tension end anchoring position; Wherein, N is an integer, and N≥2, each of the stress adjustment structures is used to adjust the tension force on each of the carbon plates, and the tensioning seat is used to synchronously tension each of the carbon plates under the action of an external force; The fixed end anchor comprises M first fixed anchor heads and M-1 second fixed anchor heads stacked and fixed up and down, the first fixed anchor heads and the second fixed anchor heads are both provided with the fixed end anchoring position, wherein the stacking surfaces of each adjacent first fixed anchor head are each provided with a first through groove suitable for the carbon plate to pass through, each second fixed anchor head is located on the side of the first fixed anchor head away from the tension end anchor, and is respectively flush with each first through groove; The tensioning seat is provided with a sliding cavity penetrating along the axial direction of the carbon plate, and the stress adjustment structure comprises: M first tension anchor heads are stacked and slidably embedded in the sliding cavity along the axial direction of the carbon plate, and second through grooves suitable for the carbon plate to pass through are provided between the overlapping surfaces of each adjacent first tension anchor head; M-1 second tension anchor heads, located on a side of the first tension anchor head away from the fixed end anchor, and respectively flush with each of the second through grooves; A tensioning bracket, fixedly connected to a side of the tensioning seat away from the fixed end anchor; Wherein, 2M-1=N, N≥3 and N is an odd number, the first tension anchor head and the second tension anchor head are provided with tension screws on both sides of the tension end anchoring position, and each of the tension screws passes through the tension bracket along the axial direction of the carbon plate and is screwed with an adjusting nut; The tensioning support comprises: A first connecting plate is abutted against a side wall of the tensioning seat away from the fixed end anchor, and two rows of support arms are horizontally spaced apart on the first connecting plate, and the two rows of support arms are symmetrically distributed on both sides of the second tensioning anchor head, and each row includes M-1 support arms spaced apart from each other; M-1 second connecting plates, corresponding to each of the second tension anchor heads one by one, and respectively abutting against the end walls of the corresponding two support arms; Wherein, the tensioning screws on each of the first tensioning anchor heads pass through the first connecting plate and are screwed to the adjusting nut, and the tensioning screws on each of the second tensioning anchor heads pass through the second connecting plate and are screwed to the adjusting nut.

2. The multi-layer carbon plate coordinated tensioning system according to claim 1, It is characterized in that A support baffle is provided between the first fixed anchor head and the second fixed anchor head. One side of the support baffle abuts against each of the first fixed anchor heads, and the other side abuts against each of the second fixed anchor heads. The support baffle has a third through groove or through hole suitable for the carbon plate to pass through.

3. Tensioning construction method, characterized in that, it uses the multi-layer carbon plate collaborative tensioning system described in any one of claims 1-2 for operation, including: Step S100: Calculate the carbon plate specifications and number of layers of the multi-layer carbon plate collaborative tensioning system according to the tension stress requirements, and cut the carbon plates produced in the same batch to the required length; Step S200: Fix each of the cut carbon plates on the fixed end anchor and the tension end anchor in sequence, wherein both ends of the carbon plate are respectively connected to the corresponding fixed end anchoring position and the tension end anchoring position; Step S300: Drill and implant reinforcing bars at the calibration site to fix the tensioning support and the fixed support, and connect and fix the fixed end anchor to the fixed support and the tensioning seat to the tensioning support; Step S400: Apply a tensile force to the tensioning support, and then adjust each stress adjustment structure in sequence to make the deviation of the tensile force values on each carbon plate within the required range; Step S500: Mark the layer positions of each layer of carbon plates and the anchoring positions at both ends of each layer of carbon plates, and determine the target adjustment positions of each stress adjustment structure; Step S600: Remove each layer of carbon plates from the fixed end anchor and the tension end anchor in sequence, pack them in strips and transport them to the construction site, reassemble each layer of carbon plates according to the marked layer positions and anchoring positions, and after adjusting each stress adjustment structure to the marked target adjustment positions, perform synchronous tensioning of the multi-layer carbon plates according to the construction requirements and processes.

4. The tensioning construction method according to claim 3, characterized in that, the step S400 includes: Apply a tensile force of 2 to 5 tons to the tensioning support; Use the tensioning tooling to tension the tensioning screws on each stress adjustment structure in sequence, control the tensile force within 10% to 30% of the design value of the tensile strength of the carbon plate, and control the deviation value of the tensile force received by each carbon plate to be less than 1 ton; After tensioning in place, lock the adjusting nuts on each tensioning screw.

5. The tensioning construction method according to claim 4, characterized in that, In the step S500, the target adjustment position is obtained by marking the locking positions of each adjusting nut on the corresponding tensioning screw.

6. The tensioning construction method according to claim 3, characterized in that, In the step S200, the connection of both ends of the carbon plate to the corresponding fixed end anchoring position and the tension end anchoring position respectively includes: Fix a first wedge block and a second wedge block at both ends of the carbon plate respectively, and the distance between the first wedge block and the second wedge block matches the length of the tension working section of the carbon plate; Clamp the end of the carbon plate with the first wedge block into the fixed end anchoring position, and clamp the end of the carbon plate with the second wedge block into the tension end anchoring position; Wherein, both the fixed-end anchoring position and the tensioning-end anchoring position are trapezoidal holes, and the inclined surface of the trapezoidal hole abuts against the wedge-shaped surface of the first wedge block or the second wedge block.

7. The tensioning construction method according to any one of claims 3-6, characterized in that in the step S600, before reassembling each layer of the carbon plates at the marked layer positions and anchoring positions, further comprising: applying an adhesive to the plate surface of the outermost layer of the carbon plates facing the surface to be strengthened, and applying the adhesive to both sides of the remaining layers of the carbon plates.

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