A prestressed carbon fiber sheet anchorage system

Abstract

The present application discloses a prestressed carbon fiber plate anchorage system, which includes a long strip-shaped carbon fiber plate arranged on the concrete base surface to be strengthened. One end of the carbon fiber plate is provided with a fixed-end anchor plate, and the other end is provided with a tension-end anchor plate. A fixed anchor head is arranged in the fixed-end anchor plate, and the fixed anchor head is fixedly connected to the mounting plate through bolts. A first fixing mechanism is arranged in the fixed anchor head, and a tensioning mechanism is arranged on the tension-end anchor plate. The prestressed carbon fiber plate anchorage system of the present invention can adjust the size of the carbon plate on site, the construction operation is flexible, the damage to the original concrete structure is small, and it is convenient to fix the carbon fiber plate, and the structural strength is higher.

Description

Technical Field

[0001] The present disclosure generally relates to the technical field of building reinforcement, and particularly to a prestressed carbon fiber sheet anchorage system. Background Art

[0002] The prestressed carbon fiber sheet (abbreviated as "prestressed carbon sheet") combines the advantages of carbon fiber such as light weight, high strength, corrosion resistance and fatigue resistance, and the characteristics of actively applying prestress, and is widely used in the reinforcement and upgrading of building concrete. The prestressed carbon sheet reinforcement not only has the advantages of reducing deflection deformation, actively closing cracks, and reducing the internal stress of reinforced concrete, but also endows the reinforced building with higher ultimate load and shear stress, and improves the utilization rate of carbon fiber sheets and concrete. The anchorage is the core of the prestressed carbon sheet, which can effectively transfer the load received by the carbon fiber sheet to the building to be reinforced.

[0003] Most of the existing prestressed carbon fiber sheet anchorage systems on the market are customized in length by manufacturers and assembled at the factory. The length of the carbon fiber sheet is fixed, but there will be a deviation between the actual size and the design size during the actual construction process. And once there is a deviation, it is necessary to re-cut the carbon fiber sheet and then reassemble it. Due to safety and technical confidentiality, the manufacturer generally returns it to the original manufacturer for reinstallation, which results in low efficiency and increased project volume.

[0004] In addition, during the construction of the existing anchorage system, due to the small space for fixing the carbon fiber sheet, it is very inconvenient to fix the carbon fiber sheet. The structural strength of the anchorage is insufficient and it is easy to bend and yield when applying stress. And the anchorage needs to be buried in the concrete surface layer, which will cause a large area of concrete grooving and great damage to the original concrete structure protection layer. Summary of the Invention

[0005] In view of the above defects or deficiencies in the prior art, it is desirable to provide a prestressed carbon fiber sheet anchorage system that can adjust the carbon sheet size on site, has flexible construction operations, causes little damage to the original concrete structure, is convenient for fixing the carbon fiber sheet, and has higher structural strength.

[0006] A prestressed carbon fiber sheet anchorage system provided by the present application includes a long strip-shaped carbon fiber sheet disposed on the concrete base surface to be reinforced; a fixed-end anchor plate is disposed at one end of the carbon fiber sheet, and a tension-end anchor plate is disposed at the other end.

[0007] The fixed-end anchor plate includes first fixing plates symmetrically arranged on both sides of the carbon fiber plate in the length direction; connecting plates are fixedly arranged on the adjacent sides of the two first fixing plates; an installation plate is arranged between the two connecting plates; a fixing groove is formed between the plate surface of the installation plate close to the concrete base surface and the two connecting plates; a fixed anchor head is arranged in the fixing groove; the fixed anchor head is fixedly connected to the installation plate by bolts; a first opening groove is formed on the installation plate on the side of the fixed anchor head away from the carbon fiber plate; two reinforcing steel plates are arranged on the plate surface of the installation plate away from the concrete base surface along the length direction of the carbon fiber plate; a first fixing mechanism is arranged in the fixed anchor head;

[0008] The tensioning-end anchor plate includes a U-shaped sliding groove buckled on the concrete base surface; the sliding groove is arranged along the length direction of the carbon fiber plate; second fixing plates are symmetrically and fixedly arranged on both sides of the sliding groove along the length direction of the carbon fiber plate; a support plate is fixedly arranged at the end of the sliding groove away from the carbon fiber plate; a second opening groove is formed on the wall surface of the sliding groove opposite to the concrete base surface along the length direction of the carbon fiber plate.

[0009] A tensioning mechanism is arranged on the tensioning-end anchor plate; the tensioning mechanism includes a tensioning anchor head slidably arranged in the sliding groove; two tensioning screw rods are fixedly arranged at the end of the tensioning anchor head away from the carbon fiber plate in a direction perpendicular to the carbon fiber plate; a tensioning baffle is arranged on the side of the support plate away from the sliding groove; the two tensioning screw rods slidably penetrate through the support plate and the tensioning baffle; a jack is fixedly arranged between the support plate and the tensioning baffle; first nuts are threadedly sleeved on the two tensioning screw rods on the side of the support plate close to the tensioning baffle; second nuts are threadedly sleeved on the two tensioning screw rods on the side of the tensioning baffle away from the support plate; a second fixing mechanism is arranged in the tensioning anchor head between the concrete base surface and the two tensioning screw rods.

[0010] Preferably, the first fixing mechanism includes a first wedge-shaped channel arranged along the length direction of the carbon fiber plate; the height of the first wedge-shaped channel gradually increases in the direction away from the carbon fiber plate; the end of the carbon fiber plate close to the fixed anchor head extends into the first wedge-shaped channel; first wedge plugs are symmetrically arranged on both sides of the carbon fiber plate in the first wedge-shaped channel; a first toothed structure is arranged on the wall surface of the first wedge plug in contact with the carbon fiber plate;

[0011] The second fixing mechanism includes a second wedge-shaped channel arranged along the length direction of the carbon fiber plate; the height of the second wedge-shaped channel gradually increases in the direction away from the carbon fiber plate; the end of the carbon fiber plate close to the tensioning anchor head extends into the second wedge-shaped channel; second wedge plugs are symmetrically arranged on both sides of the carbon fiber plate in the second wedge-shaped channel; a second toothed structure is arranged on the wall surface of the second wedge plug in contact with the carbon fiber plate.

[0012] Preferably, the tensioning screw rod and the tensioning anchor head are detachably fixedly connected by a threaded structure.

[0013] Preferably, a plurality of first fixing holes are uniformly arranged on the first fixing plate; the fixed-end anchor plate is fixed to the concrete base surface by bolts passing through the first fixing holes;

[0014] A plurality of second fixing holes are uniformly arranged on the second fixing plate; the tensioning-end anchor plate is fixed to the concrete base surface by bolts passing through the second fixing holes.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows:

[0016] 1. Due to the eccentric design of the tensioning anchor head in the prestressed carbon fiber plate anchoring system of the present application, that is, the second fixing mechanism and the tensioning screw rod are not in the same straight line, the stress on the tensioning screw rod in the tensioning anchor head and the stress on the carbon fiber plate are not in the same straight line. Therefore, it is only necessary to groove the concrete base surface in the sliding groove of the tensioning-end anchor plate. In the fixing groove of the fixed-end anchor plate, it is only necessary to groove the concrete base surface where the fixed anchor head is placed. The grooving area is greatly reduced, and the damage to the original structure is weakened;

[0017] 2. The length of the carbon fiber plate can be cut according to the actual construction length on site, avoiding rework caused by the deviation between the design size and the actual size;

[0018] 3. The carbon fiber plate and the fixing mechanism are in mechanical contact, avoiding the problem of the later failure of the anchor due to the aging of the structural adhesive;

[0019] 4. The setting of the reinforcing steel plate makes the anchoring stability of the prestressed anchoring system higher, and the maximum tensioning stress can reach more than 1600 MPa; when fixing the carbon fiber plate through the first fixing mechanism and the second fixing mechanism, the hand can be inserted through the first opening groove and the second opening groove, so that the carbon fiber plate can be conveniently fixed in the fixed anchor head and the tensioning anchor head. The stability and construction convenience of the anchor of this application are much higher than the conventional anchors on the market at present. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes and advantages of the present application will become more obvious:

[0021] Figure 1 It is a schematic structural diagram of a prestressed carbon fiber plate anchoring system provided by an embodiment of the present application;

[0022] Figure 2 It is a schematic side view structure diagram of the fixed-end anchor plate;

[0023] Figure 3 It is a schematic structural diagram of the tensioning anchor head;

[0024] Figure 4 It is a schematic structural diagram of the first fixing mechanism;

[0025] Figure 5 It is a structural schematic diagram of the second fixing mechanism.

[0026] Reference numerals in the figure: 11, carbon fiber board; 12, fixed-end anchor plate; 13, tension-end anchor plate; 14, fixed anchor head; 15, first fixing mechanism; 16, tensioning mechanism; 17, second fixing mechanism;

[0027] 21, first fixing plate; 22, connecting plate; 23, mounting plate; 24, fixing groove; 25, first opening groove; 26, reinforcing steel plate; 27, first fixing hole;

[0028] 31, sliding groove; 32, second fixing plate; 33, support plate; 34, second opening groove; 35, second fixing hole;

[0029] 51, first wedge-shaped channel; 52, first wedge plug; 53, first toothed structure;

[0030] 61, tensioning anchor head; 62, tensioning screw rod; 63, tensioning baffle; 64, jack; 65, first nut; 66, second nut.

[0031] 71, second wedge-shaped channel; 72, second wedge plug; 73, second toothed structure. Specific embodiments

[0032] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the sake of description, only the parts related to the invention are shown in the drawings.

[0033] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0034] Please refer to Figures 1 to 5 , an embodiment of the present application provides a prestressed carbon fiber board anchorage system, including a long strip-shaped carbon fiber board 11 arranged on the concrete base surface to be reinforced; a fixed-end anchor plate 12 is arranged at one end of the carbon fiber board, and a tension-end anchor plate 13 is arranged at the other end.

[0035] The fixed-end anchor plate 12 includes first fixing plates 21 symmetrically arranged on both sides of the carbon fiber plate 11 in the length direction, which are used to fix the fixed-end anchor plate 12 on the concrete base surface; connecting plates 22 are fixedly arranged on the adjacent sides of the two first fixing plates 21; an installation plate 23 is arranged between the two connecting plates 22; a fixing groove 24 is formed between the plate surface of the installation plate 23 close to the concrete base surface and the two connecting plates 22; a fixing anchor head 14 is arranged in the fixing groove 24, which is used to fix the carbon fiber plate 11; the fixing anchor head 14 is fixedly connected to the installation plate 23 by bolts; a first opening groove 25 is formed on the installation plate 23 on the side of the fixing anchor head 14 away from the carbon fiber plate 11; two reinforcing steel plates 26 are arranged on the plate surface of the installation plate 23 away from the concrete base surface along the length direction of the carbon fiber plate 11, effectively enhancing the structural strength of the fixed-end anchor plate 12 and preventing the fixed-end anchor plate 12 from bending and yielding due to excessive tensile stress; a first fixing mechanism 15 is arranged in the fixing anchor head 14, and the carbon fiber plate 11 is fixed in the fixing anchor head 14 through the first fixing mechanism 15. When fixing the carbon fiber plate 11 through the first fixing mechanism 15, the carbon fiber plate 11 can be more conveniently fixed in the fixing anchor head 14 through the first opening groove 34.

[0036] The tension-end anchor plate 13 includes a U-shaped chute 31 buckled on the concrete base surface; the chute 31 is arranged along the length direction of the carbon fiber plate 11, and the direction of the chute 31 is used as the stretching track of the carbon fiber plate 11; second fixing plates 32 are symmetrically and fixedly arranged on both sides of the chute 31 along the length direction of the carbon fiber plate 11, and the tension-end anchor plate 13 is fixed on the concrete base surface through the second fixing plates 32; a support plate 33 is fixedly arranged at the end of the chute 31 away from the carbon fiber plate 11, serving as a support base for stretching the carbon fiber plate 11; a second opening groove 34 is formed on the wall surface of the chute 31 opposite to the concrete base surface along the length direction of the carbon fiber plate 11.

[0037] A tensioning mechanism 16 is provided on the tensioning end anchor plate 13 for prestressing the carbon fiber plate 11; the tensioning mechanism 16 includes a tensioning anchor head 61 slidably disposed in the chute 31 for fixing the carbon fiber plate; at the end of the tensioning anchor head 61 away from the carbon fiber plate 11, two tensioning screw rods 62 are fixedly provided in a direction perpendicular to the carbon fiber plate 11; a tensioning baffle 63 is provided on one side of the support plate 33 away from the chute 31; the two tensioning screw rods 62 slidably penetrate through the support plate 33 and the tensioning baffle 63; a jack 64 is fixedly provided between the support plate 33 and the tensioning baffle 63; on both sides of the support plate 61 close to the tensioning baffle 63 on the two tensioning screw rods 62, first nuts 65 are threadedly sleeved; on both sides of the tensioning baffle 63 away from the support plate 33 on the two tensioning screw rods 62, second nuts 66 are threadedly sleeved; a second fixing mechanism 17 is provided between the concrete base surface and the two tensioning screw rods 62 in the tensioning anchor head 61, and the carbon fiber plate 11 is fixed in the tensioning anchor head 61 through the second fixing mechanism 17. When fixing the carbon fiber plate 11 through the second fixing mechanism 17, the carbon fiber plate 11 can be more conveniently fixed in the tensioning anchor head 61 through the second opening groove 34.

[0038] Working principle:

[0039] First, cut the carbon fiber plate 11 according to the actual on-site dimensions and the elongation of the carbon fiber plate 11. Place the two ends of the cut carbon fiber plate 11 into the fixed anchor head 14 and the tensioning anchor head 61 respectively. At the same time, fix the carbon fiber plate 11 through the first fixing mechanism 15 and the second fixing mechanism 17. Then, fix the fixed anchor head 14 in the fixed groove 24 through bolts. Place the tensioning anchor head 61 into the chute 31 of the tensioning end anchor plate 13 and fix it through the tensioning screw rod 62. One end of the tensioning screw rod 62 is connected to the tensioning anchor head 61, and the other end passes through the support plate 33 and the tensioning baffle 63. The jack 64 is fixedly installed between the tensioning baffle 63 and the support plate 33. After giving the oil pressure, the jack 64 drives the tensioning screw rod 62 and the tensioning anchor head 61 to move together, elongating the carbon fiber plate 11. When the carbon fiber plate 11 reaches a certain tensile stress and elongation, lock the prestress through the two first nuts 65, that is, complete the prestressing process.

[0040] In a preferred embodiment, the first fixing mechanism 15 includes a first wedge-shaped channel 51 arranged along the length direction of the carbon fiber plate 11; the height of the first wedge-shaped channel 51 gradually increases in a direction away from the carbon fiber plate 11; the end of the carbon fiber plate 11 close to the fixed anchor head 14 extends into the first wedge-shaped channel 51; first wedge plugs 52 are symmetrically arranged on both sides of the carbon fiber plate 11 in the first wedge-shaped channel 51; a first tooth-shaped structure 53 is arranged on the wall surface of the first wedge plug 52 in contact with the carbon fiber plate 11.

[0041] The second fixing mechanism 17 includes a second wedge-shaped channel 71 arranged along the length direction of the carbon fiber board 11; the height of the second wedge-shaped channel 71 gradually increases in the direction away from the carbon fiber board 11; the end of the carbon fiber board 11 close to the tensioning anchor head 61 extends into the second wedge-shaped channel 71; second wedge plugs 72 are symmetrically arranged on both sides of the carbon fiber board 11 in the second wedge-shaped channel 71; a second tooth-shaped structure 73 is arranged on the wall surface of the second wedge plug 72 in contact with the carbon fiber board 11.

[0042] The carbon fiber board 11, the first fixing mechanism 15 and the second fixing mechanism 17 are all in mechanical contact, avoiding the problem of the later failure of the anchor due to the aging of the structural adhesive and prolonging the service life of the structure.

[0043] In a preferred embodiment, the tensioning screw 62 and the tensioning anchor head 61 are detachably fixedly connected through a threaded structure, which is convenient for the installation of the structural fixed connection.

[0044] In a preferred embodiment, a number of first fixing holes 27 are uniformly arranged on the first fixing plate 21; the fixed-end anchor plate 12 is fixed to the concrete base surface by bolts passing through the first fixing holes 27, and the fixed-end anchor plate 12 is firmly fixed;

[0045] A number of second fixing holes 35 are uniformly arranged on the second fixing plate 32; the tensioning-end anchor plate 13 is fixed to the concrete base surface by bolts passing through the second fixing holes 35, and the tensioning-end anchor plate 13 is firmly fixed.

[0046] The above description is only the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application with similar functions.

Claims

1. A prestressed carbon fiber plate anchorage system, characterized in that, It includes a strip-shaped carbon fiber plate (11) arranged on the concrete base surface to be strengthened; one end of the carbon fiber plate is provided with a fixed-end anchor plate (12), and the other end is provided with a tension-end anchor plate (13); The fixed-end anchor plate (12) includes first fixing plates (21) symmetrically arranged on both sides of the carbon fiber plate (11) in the length direction; connecting plates (22) are fixedly arranged on the adjacent sides of the two first fixing plates (21); an installation plate (23) is arranged between the two connecting plates (22); a fixing groove (24) is formed between the plate surface of the installation plate (23) close to the concrete base surface and the two connecting plates (22); a fixed anchor head (14) is arranged in the fixing groove (24); the fixed anchor head (14) is fixedly connected to the installation plate (23) by bolts; a first opening groove (25) is formed on the plate surface of the installation plate (23) on the side where the fixed anchor head (14) is away from the carbon fiber plate (11); two reinforcing steel plates (26) are arranged on the plate surface of the installation plate (23) away from the concrete base surface along the length direction of the carbon fiber plate (11); a first fixing mechanism (15) is arranged in the fixed anchor head (14); The tension-end anchor plate (13) includes a U-shaped sliding groove (31) buckled on the concrete base surface; the sliding groove (31) is arranged along the length direction of the carbon fiber plate (11); second fixing plates (32) are symmetrically and fixedly arranged on both sides of the sliding groove (31) along the length direction of the carbon fiber plate (11); a support plate (33) is fixedly arranged at the end of the sliding groove (31) away from the carbon fiber plate (11); a second opening groove (34) is formed on the wall surface of the sliding groove (31) opposite to the concrete base surface along the length direction of the carbon fiber plate (11); A tensioning mechanism (16) is arranged on the tension-end anchor plate (13); the tensioning mechanism (16) includes a tensioning anchor head (61) slidably arranged in the sliding groove (31); two tensioning screw rods (62) are fixedly arranged at the end of the tensioning anchor head (61) away from the carbon fiber plate (11) in a direction perpendicular to the carbon fiber plate (11); a tensioning baffle (63) is arranged on the side of the support plate (33) away from the sliding groove (31); the two tensioning screw rods (62) slidably penetrate through the support plate (33) and the tensioning baffle (63); a jack (64) is fixedly arranged between the support plate (33) and the tensioning baffle (63); first nuts (65) are threadedly sleeved on the two tensioning screw rods (62) on the side of the support plate (33) close to the tensioning baffle (63); second nuts (66) are threadedly sleeved on the two tensioning screw rods (62) on the side of the tensioning baffle (63) away from the support plate (33); a second fixing mechanism (17) is arranged in the tensioning anchor head (61) between the concrete base surface and the two tensioning screw rods (62).

2. The prestressed carbon fiber sheet anchorage system according to claim 1, characterized in that The first fixing mechanism (15) includes a first wedge-shaped channel (51) arranged along the length direction of the carbon fiber board (11); the height of the first wedge-shaped channel (51) gradually increases in the direction away from the carbon fiber board (11); the end of the carbon fiber board (11) close to the fixing anchor head (14) extends into the first wedge-shaped channel (51); first wedge plugs (52) are symmetrically arranged on both sides of the carbon fiber board (11) in the first wedge-shaped channel (51); a first tooth-shaped structure (53) is arranged on the wall surface of the first wedge plug (52) that fits the carbon fiber board (11). The second fixing mechanism (17) includes a second wedge-shaped channel (71) arranged along the length direction of the carbon fiber board (11); the height of the second wedge-shaped channel (71) gradually increases in the direction away from the carbon fiber board (11); the end of the carbon fiber board (11) close to the tensioning anchor head (61) extends into the second wedge-shaped channel (71); second wedge plugs (72) are symmetrically arranged on both sides of the carbon fiber board (11) in the second wedge-shaped channel (71); a second tooth-shaped structure (73) is arranged on the wall surface of the second wedge plug (72) that fits the carbon fiber board (11).

3. The prestressed carbon fiber sheet anchoring system according to claim 2, characterized in that, The tensioning screw rod (62) and the tensioning anchor head (61) are detachably and fixedly connected through a threaded structure.

4. The prestressed carbon fiber sheet anchoring system according to claim 3, characterized in that, A plurality of first fixing holes (27) are uniformly arranged on the first fixing plate (21); the fixed-end anchor plate (12) is fixed to the concrete base surface by bolts passing through the first fixing holes (27). A plurality of second fixing holes (35) are uniformly arranged on the second fixing plate (32); the tensioning-end anchor plate (13) is fixed to the concrete base surface by bolts passing through the second fixing holes (35).

Images