Prestress carbon fiber reinforcing device for pier column
By wrapping carbon fiber plates around the outside of the pier and applying prestress, combined with anchors and tensioning devices, the shortcomings of traditional reinforcement methods are solved, efficient reinforcement of the pier is achieved, the compressive bearing capacity and seismic resistance are improved, and construction is convenient.
Patent Information
- Application Number
- CN202422268842.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-09-14
AI Technical Summary
Traditional concrete pier reinforcement methods have the disadvantages of long wet working periods and high sleeve reinforcement costs. In addition, the passive reinforcement method of ordinary carbon fiber materials results in the failure to fully utilize the high-strength properties of the material, and the improvement in compressive bearing capacity is limited.
A prestressed carbon fiber reinforcement device is designed. The carbon fiber plate is wrapped around the outside of the pier column and prestressed by the tensioning device. The anchor, screw and tensioning cable form a system to achieve effective constraint on the pier column.
The compressive bearing capacity and seismic resistance of the pier are improved, the stress lag problem is avoided, and the carbon fiber material can fully exert its high strength characteristics from the beginning, thereby improving the overall reinforcement effect. The construction is convenient and can adapt to piers of different sizes and shapes.
Smart Images
Figure CN223329721U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a prestressed carbon fiber reinforcement device for a pier column, belonging to the technical field of construction engineering. Background Art
[0002] Traditional concrete pier reinforcement construction often involves increasing the cross-section or using sleeves, but this approach suffers from long wet work periods and high sleeve reinforcement costs. Carbon fiber materials offer excellent corrosion resistance and are easy to construct. Using carbon fiber to wrap and restrain concrete components to improve their compressive bearing capacity has been increasingly used in recent years. However, wrapping and restraining pier columns with conventional carbon fiber materials is a passive reinforcement method. The carbon fiber material only begins to exert its restraining effect after the concrete expands, resulting in a "stress lag" phenomenon, which prevents the material's high-strength properties from being fully utilized. Consequently, researchers have developed prestressed carbon fiber cloth to reinforce pier columns. However, due to the limited thickness of the carbon cloth itself, the prestress that can be applied is limited, resulting in a limited improvement in the pier's compressive bearing capacity. Therefore, there is a need to design a prestressed carbon fiber reinforcement device for pier columns that can fully restrain the pier concrete and improve its bearing capacity and seismic resistance. Utility Model Content
[0003] Therefore, the purpose of the present invention is to provide a prestressed carbon fiber reinforcement device for pier columns, which can wrap the carbon fiber plate around the outside of the pier column and use an external tensioning device to prestress the carbon fiber plate to fully constrain the pier column concrete.
[0004] In order to achieve the above-mentioned purpose, the utility model provides a prestressed carbon fiber reinforcement device for a pier column, comprising a carbon fiber plate that passes around the pier column, anchors are connected at both ends of the carbon fiber plate, the two anchors are connected by a screw, and the two ends of the screw pass through the through holes on the anchor and are screwed with nuts; the prestressed carbon fiber reinforcement device also includes a tensioning device, which includes a tensioning seat, two tensioning cables, a first jack and a reaction device, the tensioning seat includes two left and right baffles, namely a first baffle and a second baffle; the two anchors are respectively a first anchor and a second anchor The two tensioning cables are respectively the first tensioning cable and the second tensioning cable; one end of the first tensioning cable is connected to the first anchor, and the other end is connected to the first jack after passing through the through hole on the first baffle; the first jack is placed on the first baffle and can pull the first tensioning cable, and the first tensioning cable can apply tension to the first anchor so that the first anchor has a tendency to approach the second anchor; one end of the second tensioning cable is connected to the second anchor, and the other end is connected to the reaction device after passing through the through hole on the second baffle, and the reaction device is placed on the second baffle.
[0005] The tensioning seat also includes a column, which is arranged between the first baffle and the second baffle. The first anchor and the first jack are located on one side of the column, and the second anchor and the reaction device are located on the other side of the column. The first tension cable and the second tension cable pass around the column.
[0006] The reaction device is a second jack.
[0007] The anchor comprises a main body with a wedge-shaped hole in the main body and a clip in the wedge-shaped hole for clamping one end of the carbon fiber plate; connecting ears for connecting the screw are respectively provided at the upper and lower ends of the main body.
[0008] A protruding connection block is also provided on the main body, and the tensioning cable is connected to the connection block.
[0009] An accommodating groove for accommodating the anchor and the screw is provided on the pier.
[0010] The tensioning cable is a steel strand.
[0011] By adopting the above-mentioned technical solution, the prestressed carbon fiber reinforcement device for the pier column of the present invention, through a system composed of carbon fiber plates, anchors and screws, can improve the compressive bearing capacity and seismic resistance of the pier column, thereby enhancing the overall structural performance of the pier column. In addition, the tensioning device can apply prestress to the carbon fiber plate, avoiding the "stress lag" problem of traditional passive reinforcement, so that the carbon fiber plate can fully exert its high strength characteristics from the beginning, and improve the overall reinforcement effect. The tensioning device is composed of a tensioning seat, tensioning cable, first jack and reaction device, which can efficiently tension the carbon fiber plate. At the same time, the tensioning force is adjusted by the screw and nut to ensure uniform prestressing of the carbon fiber plate. The device has a simple structure and is easy to construct. It can adapt to piers of different sizes and shapes and is particularly suitable for places with small space or limited construction conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a structural diagram of embodiment 1 of the present utility model.
[0013] Figure 2 It is a partial schematic diagram of embodiment 1.
[0014] Figure 3 This is a schematic diagram of the top structure of Example 1.
[0015] Figure 4 This is a schematic diagram of the top structure of Example 2.
[0016] Figure 5 This is a schematic diagram of the top structure of Example 3. DETAILED DESCRIPTION
[0017] The present invention will be further described in detail below through the accompanying drawings and specific implementation methods.
[0018] like Figure 1-3 As shown, the present invention provides a prestressed carbon fiber reinforcement device for a pier column, comprising a carbon fiber plate 2 that wraps around the pier column 1. Anchors are connected to each end of the carbon fiber plate 2. The anchor comprises a body 301 having a wedge-shaped hole 302 therein. A clip 303 is disposed within the wedge-shaped hole 302, and the clip 303 clamps one end of the carbon fiber plate 2. Two connecting ears 304 for connecting to screw rods 4 are disposed at the upper and lower ends of the body 301, respectively. The two anchors are connected by two screw rods 4. The ends of the screw rods 4 pass through the through holes in the connecting ears 304 and are then threaded with nuts 5.
[0019] The prestressed carbon fiber reinforcement device also includes a tensioning device, which includes a tensioning seat 6, two tensioning cables, a first jack 8, and a reaction device. In this embodiment, the reaction device is a reaction block 9, and the tensioning cables can be steel strands. The tensioning seat 6 includes a top plate 61, a bottom plate 62, and two left and right baffles, namely a first baffle 63 and a second baffle 64, and a column 65 located between the first baffle 63 and the second baffle 64. The two anchors are a first anchor 31 and a second anchor 32, and the two tensioning cables are a first tensioning cable 71 and a second tensioning cable 72.
[0020] A protruding connection block 306 is also provided on the main body 301 , and the connection block 306 is used for tensioning cable connection.
[0021] In this embodiment, the first anchor 31 and the first jack 8 are located on one side of the column 65, and the second anchor 32 and the reaction block 9 are located on the other side of the column 65. One end of the first tension cable 71 is connected to the first anchor 31, and the other end passes around the column 65, passes through the through hole on the first baffle 63, and is connected to the first jack 8. The first jack 8 is supported on the first baffle 63 and can pull the first tension cable 71. The first tension cable 71 can apply tension to the first anchor 31, causing the first anchor 31 to tend to approach the second anchor 32. One end of the second tension cable 72 is connected to the second anchor 32, and the other end passes around the column 65, passes through the through hole on the second baffle 64, and is connected to the reaction block 9. The reaction block 9 is supported on the second baffle 64.
[0022] like Figure 4 As shown, in another embodiment of the present invention, the column 65 for the first and second cables 71 and 72 to bypass is not provided, and the first and second cables 71 and 72 are directly connected to the reaction block 9 and the first jack 8 respectively.
[0023] like Figure 5 As shown, in another embodiment of the present invention, the reaction device can also be a second jack 90. The first jack 8 and the second jack 90 on the left and right sides can achieve synchronous tensioning at both ends, thereby reducing the problem of uneven stress distribution on the left and right sides of the carbon fiber plate.
[0024] During construction, the lines are first positioned and laid out according to the design requirements, and a receiving slot 10 is formed on the pier 1 to accommodate the anchor and screw 4. The carbon fiber plate 2 is then installed in the anchor, and the two anchors are connected using screw 4. If the required prestress is small, the nut 5 can be rotated with a torque wrench to adjust its position on the screw 4 to complete the application of prestress. If the required prestress is large, tensioning can be performed using a tensioning device. Specifically, the steel strand is connected to the anchor, tensioned using the first jack 8 or stretched simultaneously by the first jack 8 and the second jack 90, and then locked using the screw 4 and nut 5. After locking is completed, the tensioning device is removed, and the receiving slot 10 is sealed with epoxy structural adhesive or mortar.
[0025] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.
Claims
1. A prestressed carbon fiber reinforcement device for a pier column, characterized by: The present invention relates to a prestressed carbon fiber reinforcement device, wherein the prestressed carbon fiber reinforcement device further comprises a tensioning device, wherein the tensioning device comprises a tensioning seat, two tensioning cables, a first jack and a reaction device, wherein the tensioning seat comprises two left and right baffles, namely a first baffle and a second baffle; the two anchors are respectively a first anchor and a second anchor, and the two tensioning cables are respectively a first tensioning cable and a second tensioning cable; one end of the first tensioning cable is connected to the first anchor, and the other end passes through the through hole on the first baffle and is connected to the first jack; the first jack is supported on the first baffle and can pull the first tensioning cable, and the first tensioning cable can apply tension to the first anchor so that the first anchor has a tendency to approach the second anchor; one end of the second tensioning cable is connected to the second anchor, and the other end passes through the through hole on the second baffle and is connected to the reaction device, and the reaction device is supported on the second baffle.
2. The prestressed carbon fiber reinforcement device for a pier column according to claim 1, characterized in that: The tensioning seat also includes a column, which is arranged between the first baffle and the second baffle. The first anchor and the first jack are located on one side of the column, and the second anchor and the reaction device are located on the other side of the column. The first tension cable and the second tension cable pass around the column.
3. The prestressed carbon fiber reinforcement device for a pier column according to claim 2, characterized in that: The reaction device is a second jack.
4. The prestressed carbon fiber reinforcement device for a pier column according to claim 1, characterized in that: The anchor comprises a main body with a wedge-shaped hole in the main body and a clip in the wedge-shaped hole for clamping one end of the carbon fiber plate; connecting ears for connecting the screw are respectively provided at the upper and lower ends of the main body.
5. The prestressed carbon fiber reinforcement device for a pier column according to claim 4, characterized in that: A protruding connection block is also provided on the main body, and the tensioning cable is connected to the connection block.
6. The prestressed carbon fiber reinforcement device for a pier column according to any one of claims 1 to 5, characterized in that: An accommodating groove for accommodating the anchor and the screw is provided on the pier.
7. The prestressed carbon fiber reinforcement device for a pier column according to any one of claims 1 to 5, characterized in that: The tensioning cable is a steel strand.