An arc-shaped carbon fiber cloth external prestressed tensioning device

Abstract

The present invention relates to the field of building structure reinforcement, and specifically to an external prestressed tensioning device for carbon fiber cloth with an arc-shaped structure. It comprises two fixed end mechanisms, two connecting pieces, and two carbon fiber cloths. The two fixed end mechanisms each comprise a fixed end body, a roller, and a roller limit block. The two rollers are rotatably mounted on the fixed end body via corresponding roller limit blocks. The two ends of the two carbon fiber cloths are respectively passed around the rollers on both sides from above and fixedly connected to the corresponding connecting pieces. The two connecting pieces are locked by a first bolt and a corresponding fixing nut. In the device of the present invention, a pulley-like force-bearing mechanism is formed by the carbon fiber cloth passing around the rollers, so that the prestress applied to the first bolt is doubled when it is transmitted to the fixed end mechanism of the device.

Description

Technical Field

[0001] The invention relates to the field of building structure reinforcement, and in particular to an external prestressed tensioning device for carbon fiber cloth with an arc structure. Background Art

[0002] With the widespread application of carbon fiber materials in the construction field, technologies that use carbon fiber materials to apply prestress to structures to reinforce and repair building structures have also made great progress. Due to their high strength, lightweight, corrosion resistance and durability, these technologies have become one of the main options for structural repair and reinforcement. However, when faced with some complex environments and complex structures, existing carbon fiber material repair technologies have significant limitations in practical use.

[0003] First, existing carbon fiber material prestressing tensioning devices, such as prestressed carbon fiber plate prestressing tensioning devices, are designed mainly for regular planes or simple-shaped structures, such as the bottom surface of a bridge or the bottom of a beam of a building structure. These structures have sufficient space for prestressing tensioning operations, so they can better complete the prestressing reinforcement work. However, for curved structures such as shield subway tunnels, there is no sufficient plane and the construction space is relatively small. Therefore, traditional carbon fiber plate prestressing tensioning devices are difficult to play their role in such structures.

[0004] For example, patent CN106193643A discloses a prestressed carbon fiber plate tensioning and anchoring device, the design of which requires the object to be repaired to have a large plane or regular structure, making it difficult to use in a narrow or curved space; while patent CN117449608B discloses an automatic leveling carbon fiber plate prestressed tensioning device for curved structures. Although it can be used for curved structures, the device disclosed in the invention occupies a large space and is also difficult to use for structures such as shield subway tunnels.

[0005] In summary, existing carbon fiber prestressing technology has limited effectiveness in reinforcing and repairing curved structures based on bolted connections, particularly in achieving minimal footprint and convenient construction. Therefore, for these types of structures, a carbon fiber prestressing device that minimizes footprint, facilitates construction, and adapts to various curved surfaces is an urgent challenge for those skilled in the art. Summary of the Invention

[0006] In response to the problems existing in the above-mentioned prior art, the present invention provides an arc-shaped carbon fiber cloth external prestressing tensioning device, and specifically discloses the following technical solutions:

[0007] A device for prestressing carbon fiber cloth in vitro with an arc structure comprises two fixed end mechanisms, two connecting pieces and two carbon fiber cloths. The two fixed end mechanisms each comprise a fixed end body, a roller and a roller limit block. The two rollers are rotatably mounted on the fixed end body through corresponding roller limit blocks. The two ends of the two carbon fiber cloths are respectively passed through the rollers on both sides from above and fixedly connected to the corresponding connecting pieces. The two connecting pieces are locked together by a first bolt and a corresponding fixing nut.

[0008] Furthermore, the fixed end body includes a horizontal support plate, and the front and rear sides of the bottom end of the horizontal support plate are respectively fixedly connected with side plates, and the roller limit block is fixed to one end of the two side plates by a second bolt. A roller mounting hole is provided between each side plate and the roller limit block, and the roller mounting hole is used to install the roller.

[0009] Furthermore, the roller mounting hole is formed by connecting a half hole on the side plate and a half hole on the roller limiting block, and the inner diameter of the roller mounting hole is larger than the diameter of the roller.

[0010] Furthermore, the horizontal support plate is provided with a plurality of mounting holes.

[0011] Furthermore, the first bolt and the second bolt are both high-strength bolts.

[0012] Furthermore, the connecting member includes a connecting plate, and the front and rear sides of the connecting plate are respectively fixedly connected with horizontal fixed shafts. One end of the first bolt passes through the connecting plates of the two connecting members in sequence and is installed with a fixing nut. The two ends of each carbon fiber cloth are respectively fixedly connected to the two horizontal fixed shafts on the same side of the two connecting members.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The inner diameter of the roller mounting hole in the present invention is larger than the diameter of the roller, thereby providing space for the roller to move, so that it has the ability to automatically level the carbon fiber cloth, thereby avoiding asymmetric or eccentric application of prestress caused by installation errors or size differences;

[0015] The present invention achieves doubling of the applied prestress by passing the carbon fiber cloth around rollers on both sides so that the rollers act as pulleys.

[0016] The device of the present invention is small in size and can be easily installed and functioned in a narrow space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2It is the front view of the present invention.

[0019] Figure 3 It is a side view of the present invention.

[0020] Figure 4 It is a top view of the present invention.

[0021] Figure 5 This is a structural exploded view of the fixed end mechanism in the present invention.

[0022] Figure 6 It is a structural schematic diagram of the fixed end body in the present invention.

[0023] Figure 7 Schematic diagram of the winding structure of carbon fiber cloth and roller in the present invention.

[0024] Figure 8 It is a structural schematic diagram of the roller in the present invention.

[0025] Figure 9 It is a structural schematic diagram of the connecting piece in the present invention.

[0026] Figure 10 It is the front view of the connecting piece in the present invention.

[0027] Figure 11 This is a diagram showing the winding of the carbon fiber cloth on the connecting piece in the present invention.

[0028] Figure 12 Schematic diagram of the connection structure of carbon fiber cloth, roller and connecting parts in the present invention.

[0029] Figure 13 Schematic diagram of the installation of the present invention in a subway tunnel segment.

[0030] In the figure: 1-fixed end body; 2-roller limit block; 3-roller; 4-second bolt; 5-connecting piece; 6-first bolt; 7-carbon fiber cloth; 8-third bolt; 9-subway tunnel segment. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Reference Figure 1-13A device for prestressing carbon fiber cloth in an arc-shaped structure comprises two fixed-end mechanisms, two connecting members 5, and two carbon fiber cloths 7. Each fixed-end mechanism comprises a fixed-end body 1, a roller 3, and a roller stopper 2. The two rollers 3 are rotatably mounted on the fixed-end body 1 via corresponding roller stoppers 2. The two ends of the two carbon fiber cloths 7 pass over the rollers 3 on either side from above and are fixedly connected to the corresponding connecting members 5. The two connecting members 5 are locked together by first bolts 6 and corresponding fixing nuts. Tightening the fixing nuts on the first bolts 6 tightens the two carbon fiber cloths 7, causing the fixed-end mechanisms on both sides to move the corresponding structures to be reinforced toward each other, thereby suppressing the deformation of the structures to be reinforced and strengthening and toughening them.

[0033] In this embodiment, the carbon fiber cloth 7 passes around the rollers 3 on both sides, so that the rollers 3 have the characteristics of a pulley. After passing around the rollers 3, when the carbon fiber cloth 7 at the bottom of the rollers 3 is prestressed, the carbon fiber cloth 7 at the top of the rollers 3 will also generate prestress of the same magnitude, thereby doubling the prestress transmitted to the structure to be reinforced.

[0034] In this embodiment, the fixed end body 1 includes a horizontal support plate, and the front and rear sides of the bottom end of the horizontal support plate are fixedly connected to side plates respectively. The two side plates are arranged in parallel, and the roller limit block 2 is fixed to one end of the two side plates by a second bolt 4. A roller mounting hole is provided between each side plate and the roller limit block 2, and the roller mounting hole is used to install the roller 3.

[0035] In this embodiment, the roller mounting hole is formed by connecting the half hole on the side panel and the half hole on the roller limit block 2, and the inner diameter of the roller mounting hole is larger than the diameter of the roller 3, so that the roller 3 has a certain amount of activity space in the roller fixing hole, and can automatically adapt to the axial misalignment caused by the installation deviation of the fixed end mechanisms on both sides, ensuring that the force-bearing body composed of the carbon fiber cloth 7 and the connecting member 5 can normally transmit the axial force and eliminate eccentricity. In addition, the setting of the roller 3 can eliminate the prestress loss caused by the friction between the carbon fiber cloth 7 and the roller 3 during the prestress application process, thereby improving the prestress application efficiency.

[0036] In this embodiment, a plurality of mounting holes are provided on the horizontal support plate, and the mounting holes are used to install bolts for fixing the fixed end mechanism to the structure to be reinforced.

[0037] In this embodiment, the first bolt 6 and the second bolt 4 are both high-strength bolts.

[0038] In this embodiment, the connector 5 includes a connecting plate, with horizontal fixed shafts fixedly connected to the front and rear sides of the connecting plate. One end of a first bolt 6 passes through the connecting plates of the two connectors 5 in sequence and is installed with a fixing nut. The connection between the first bolt and the two connecting plates is a sliding connection. The two ends of each carbon fiber cloth 7 are fixedly connected to the two horizontal fixed shafts on the same side of the two connectors 5. By turning the fixing nuts on the first bolts 6, the two connectors 5 can be locked, thereby applying prestress to the structure to be reinforced.

[0039] The working principle of the present invention is:

[0040] First, according to the distribution of the mounting holes opened on the horizontal support plate of the fixed end body 1, several holes are drilled at appropriate positions on both sides of the joint of the subway tunnel segment 9, and then the prefabricated metal threaded sleeve is buried in the drilled holes through the anchor glue, and then the two fixed end bodies 1 are fixed to both sides of the joint of the subway tunnel segment 9 through several third bolts 8.

[0041] Afterwards, the two carbon fiber cloths 7 are respectively wound around the two rollers 3 from the top and wound back at the bottom of the rollers 3, and the ends of the wound carbon fiber cloths 7 are fixedly connected to the connector 5. The fixed connection method is a combination of glue impregnation and multiple winding. The specific process is as follows: first, the end of the carbon fiber cloth 7 is wrapped around the horizontal fixed shaft of the connector 5 for one circle, and the impregnating glue is applied and waited for solidification (temporarily clamped with a clip to prevent it from falling off). After the glue solidifies, the carbon fiber cloth 7 is tightly wound around the horizontal fixed shaft for 2-3 circles and the impregnating glue is continued to be applied. After the second glue is completely solidified, the fixed connection between the connector 5 and the carbon fiber cloth 7 is completed. After both ends of the carbon fiber cloth 7 are fixedly connected to the connector 5, the two connectors 5 are locked and connected by the first bolt 6 and the matching fixing nut.

[0042] Next, the two rollers 3 are respectively placed in the half holes of the fixed end body 1 on both sides, and the roller limit block 2 is fixed to the fixed end body 1 through the second bolt 4 to limit the roller 3, and then the installation of the present invention on the subway tunnel segment 9 structure is completed.

[0043] Finally, according to the required prestress, use a digital wrench or electric wrench to set the appropriate target torque value, and tighten the first bolt 6 by fixing the nut to complete the application of prestress, thereby recovering the deformation of the pipe segment joint and improving the overall strength and toughness of the joint structure.

[0044] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A carbon fiber cloth external prestressing tensioning device with an arc structure, characterized in that: It includes two fixed end mechanisms, two connecting pieces and two carbon fiber cloths. The two fixed end mechanisms each include a fixed end body, a roller and a roller stop block. The two rollers are rotatably mounted on the fixed end body through corresponding roller stop blocks. The two ends of the two carbon fiber cloths are respectively passed over the rollers on both sides from above and fixedly connected to the corresponding connecting pieces. The two connecting pieces are locked by a first bolt and a corresponding fixing nut. The fixed end body includes a horizontal support plate, and the front and rear sides of the bottom end of the horizontal support plate are respectively fixedly connected to side plates, and the roller limit block is fixed to one end of the two side plates by a second bolt. A roller mounting hole is provided between each side plate and the roller limit block, and the roller mounting hole is used to mount the roller; The roller mounting hole is formed by connecting a half hole on the side plate and a half hole on the roller limiting block, and the inner diameter of the roller mounting hole is larger than the diameter of the roller.

2. The arc-shaped carbon fiber cloth external prestressing tensioning device according to claim 1, characterized in that: The horizontal support plate is provided with a plurality of mounting holes.

3. The arc-shaped carbon fiber cloth external prestressing tensioning device according to claim 1, characterized in that: The first bolt and the second bolt are both high-strength bolts.

4. The arc-shaped carbon fiber cloth external prestressing tensioning device according to claim 1, characterized in that: The connecting member includes a connecting plate, and the front and rear sides of the connecting plate are respectively fixedly connected with horizontal fixed shafts. One end of the first bolt passes through the connecting plates of the two connecting members in sequence and is installed with a fixing nut. The two ends of each carbon fiber cloth are respectively fixedly connected to the two horizontal fixed shafts on the same side of the two connecting members.

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