Carbon fiber cloth external prestress tensioning device of arc-shaped structure

Abstract

The invention relates to the field of building structure reinforcement, in particular to a carbon fiber cloth external prestress tensioning device of an arc-shaped structure. Comprising two fixed end mechanisms, two connecting pieces and two pieces of carbon fiber cloth, each fixed end mechanism comprises a fixed end body, a rolling shaft and a rolling shaft limiting block, and the two rolling shafts are rotationally installed on the fixed end bodies through the corresponding rolling shaft limiting blocks correspondingly; the two ends of the two pieces of carbon fiber cloth bypass the rolling shafts on the two sides from the upper portion to be fixedly connected with the corresponding connecting pieces, and the two connecting pieces are locked through first bolts and corresponding fixing nuts. According to the device, the carbon fiber cloth bypasses the rolling shaft to form a pulley-like stress mechanism, so that the effect of doubling the prestress applied to the first bolt is achieved when the prestress is transmitted to the device fixing end mechanism.

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, the technology of reinforcing and repairing building structures by applying prestress to the structure based on carbon fiber materials has also been greatly developed. These technologies have become one of the main choices for structural repair and reinforcement due to their high strength, light weight, corrosion resistance and durability. However, when facing some building structures with complex shapes in complex environments, the existing carbon fiber material repair technology has great limitations in actual use.

[0003] Firstly, the existing carbon fiber material prestressing tensioning devices, such as prestressed carbon fiber plate prestressing tensioning devices, are mainly designed for regular planes or simple-shaped structures, such as the bottom of a bridge or the bottom of a beam of a building structure. These structures have sufficient space for prestressing tensioning operations, so the prestressed reinforcement work can be completed well. However, for curved structures such as shield subway tunnels, there is no sufficient plane and the construction space is relatively small. Therefore, the traditional carbon fiber plate prestressing tensioning device is difficult to play its 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, so it is difficult to use in a narrow or curved space; and patent CN117449608B discloses an automatic leveling carbon fiber plate prestressing 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, the existing carbon fiber prestressed reinforcement technology has limited effect on the reinforcement and repair of arc structures based on bolt connection, especially it is difficult to achieve small space occupation and convenient construction. Therefore, for this type of structure, how to provide a carbon fiber material prestressed tensioning device that takes up little space, is convenient to construct, and can adapt to various arc surfaces is a problem that technicians in this field need to solve urgently. Summary of the invention

[0006] In view of 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 carbon fiber cloth external prestressing tensioning device with an arc structure comprises two fixed end mechanisms, two connecting pieces and two carbon fiber cloths, wherein 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 fixedly connected to the corresponding connecting pieces by passing through the rollers on both sides from above, and the two connecting pieces are locked 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, and 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 horizontal fixed shafts are respectively fixedly connected to the front and rear sides of the connecting plate. 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 of the carbon fiber cloths 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 the roller with a movable space, 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 realizes doubling of the applied prestress by passing the carbon fiber cloth around the rollers on both sides so that the rollers act as pulleys.

[0016] The device of the present invention has a small volume 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 It is a structural exploded view of the fixed end mechanism in the present invention.

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

[0023] Figure 7 It is a schematic diagram of the winding structure of the carbon fiber cloth and the roller in the present invention.

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

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

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

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

[0028] Fig.12 It is a schematic diagram of the connection structure of the carbon fiber cloth, the roller and the connecting piece in the present invention.

[0029] Fig.13 A 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0032] Reference Figure 1-13A carbon fiber cloth external prestressing tensioning device with an arc structure includes two fixed end mechanisms, two connecting members 5 and two carbon fiber cloths 7. Both fixed end mechanisms include 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 through the corresponding roller stopper 2. The two ends of the two carbon fiber cloths 7 are respectively fixedly connected to the corresponding connecting members 5 by passing through the rollers 3 on both sides from above. The two connecting members 5 are locked by a first bolt 6 and a corresponding fixing nut. The two carbon fiber cloths 7 can be tightened by tightening the fixing nut on the first bolt 6, so that the fixed end mechanisms on both sides respectively drive the corresponding structures to be reinforced to move toward each other, thereby suppressing the opening deformation of the structures to be reinforced and reinforcing and toughening the structures to be reinforced.

[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 respectively fixedly connected with side plates, and the two side plates are arranged in parallel. The roller limit block 2 is fixed to one end of the two side plates by a second bolt 4, and a roller mounting hole is arranged 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 a half hole on the side plate and a 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 activity space in the roller fixing hole, and can automatically adapt to the axial misalignment caused by the installation deviation of the fixed end mechanism 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. 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 formed on the horizontal support plate, and the mounting holes are used to install bolts that fix the fixed end mechanism to the structure to be reinforced.

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

[0038] In this embodiment, the connecting member 5 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 6 passes through the connecting plates of the two connecting members 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, and the two ends of each carbon fiber cloth 7 are respectively fixedly connected to the two horizontal fixed shafts on the same side of the two connecting members 5. By rotating the fixing nut on the first bolt 6, the two connecting members 5 can be locked, thereby realizing the application of 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, a number of 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 embedded in the drilled holes by embedding glue, and then the two fixed end bodies 1 are fixed to both sides of the joint of the subway tunnel segment 9 by a number of third bolts 8.

[0041] Afterwards, the two carbon fiber cloths 7 are respectively wound around the two rollers 3 from the top, and then 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 method of glue impregnation combined with multiple turns of winding. The specific process is: first, the end of the carbon fiber cloth 7 is wound around the horizontal fixed shaft of the connector 5 for one turn, and the impregnated glue is applied and waited for solidification (temporarily clamped with a clip to prevent falling off). After the glue is solidified, the carbon fiber cloth 7 is tightly wound around the horizontal fixed shaft for 2-3 turns, and the impregnated 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 by 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 an electric wrench to set an appropriate target torque value, and tighten the first bolt 6 by fixing the nut to complete the application of prestress, thereby achieving the recovery of the opening deformation of the pipe segment joint and improving the overall strength and toughness of the joint structure.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight 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 limit block. The two rollers are rotatably installed on the fixed end body through corresponding roller limit blocks. The two ends of the two carbon fiber cloths are respectively fixedly connected to the corresponding connecting pieces by passing through the rollers on both sides from above. The two connecting pieces are locked by a first bolt and a corresponding fixing nut.

2. The arc-shaped carbon fiber cloth external prestressing tensioning device according to claim 1 is characterized in that: 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.

3. The arc-shaped carbon fiber cloth external prestressing tensioning device according to claim 2, characterized in that: 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 greater than the diameter of the roller.

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

5. The arc-shaped carbon fiber cloth external prestressing tensioning device according to claim 2, characterized in that: The first bolt and the second bolt are both high-strength bolts.

6. 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 horizontal fixed shafts are fixedly connected to the front and rear sides of the connecting plate respectively. 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 of the carbon fiber cloths are fixedly connected to the two horizontal fixed shafts on the same side of the two connecting members respectively.

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