Bridge external prestress reinforcing structure

Abstract

This invention relates to the field of bridge reinforcement technology, and more particularly to an external prestressed reinforcement structure for bridges, including a bridge body and reinforcement components. The reinforcement components include a fixing member with a fastening bolt at its lower left end. The fixing member is threadedly connected to the bridge body via the fastening bolt. This invention, by incorporating components such as a support plate, sliding roller, elastic compression plate, and return spring, can automatically adjust its position during the natural shrinkage of the concrete repair layer. The sliding roller slides at the bottom of the elastic sealing plate, and in conjunction with the tension of the return spring, continuously applies reverse pressure, ensuring that the sealing plate remains tightly fitted to the repair layer. The elastic compression plate, under the action of the support spring and telescopic sleeve, can evenly distribute pressure, adapting to the curvature changes of the repair layer, avoiding localized stress concentration, and ensuring that the sealing protection of the concrete repair layer does not fail during the shrinkage and shaping process, preventing crack recurrence.

Description

Technical Field

[0001] This invention relates to the field of bridge reinforcement technology, and in particular to an external prestressed reinforcement structure for bridges. Background Technology

[0002] A bridge is an elevated man-made structure used to cross natural obstacles (such as rivers and canyons) or man-made obstacles (such as roads and railways), providing a continuous and safe passage for pedestrians, vehicles, or other modes of transportation.

[0003] Chinese patent application CN202323017142.2 discloses an external prestressed reinforcement structure for bridges. Although this application achieves advantages such as improving the usability and durability of bridge beam structures and appropriately improving beam deflection and flexural bearing capacity, when the bridge is put into use, concrete is needed to repair the bottom of the bridge. Over time, the concrete is exposed on the outside, which makes it easy for the moisture in the concrete to evaporate, causing the concrete to shrink. Under the influence of gravity and water vapor in the environment, the concrete is prone to cracking, and in severe cases, it may even fall off, leading to reinforcement failure.

[0004] Therefore, how to provide an external prestressed reinforcement structure for bridges is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] One object of the present invention is to provide an external prestressed reinforcement structure for bridges to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bridge external prestressed reinforcement structure, including a bridge body and reinforcement components.

[0007] The reinforcement components include: The fastener has a first fastening bolt on its lower left side, which connects it to the bridge body via a threaded connection. A second fastening bolt is located on the bottom left side of the fastener, and a tension spring is positioned outside the second fastening bolt at the bottom of the fastener. A connecting plate is positioned between the top of the fastener and the bottom of the bridge body, with an elastic sealing plate fixedly connected to its top. The elastic sealing plate has a drainage channel that runs through its top and bottom, and a concrete repair layer is positioned on top of the elastic sealing plate. The second fastening bolt penetrates the fastener, the connecting plate, and the elastic sealing plate, extending into the bridge body and threadedly connecting to it. This allows the elastic sealing plate to cover the outside of the concrete repair layer at the bottom of the bridge body, and the second fastening bolt compresses the tension spring when tightened.

[0008] Furthermore, it also includes a drive assembly, which consists of a fixed guide groove, a threaded connecting shell, an electric telescopic rod, a threaded connecting sleeve, a lifting slider, a lifting auxiliary frame, and a positioning and fixing hole; The fixed guide groove is located on the inner side of the bottom of the bridge body. The threaded connecting shell is fixedly connected to the middle of the bottom of the fixed guide groove. The electric telescopic rod is located in the middle of the threaded connecting shell. The threaded connecting sleeve is fixedly connected to the top of the outer side of the electric telescopic rod. The lifting slider is slidably connected to the inside of the fixed guide groove. The lifting auxiliary frame is connected to the lifting slider and fixedly connected to one side of the lifting slider. The positioning and fixing hole is opened inside the lifting auxiliary frame.

[0009] Furthermore, it also includes a lifting assembly, which consists of a fixed connecting block, a damping rod, a force-bearing connecting block, a lifting frame, and a lifting plate; The fixed connecting block is fixedly connected to the middle of the lifting auxiliary frame, the damping rod is fixedly connected to the side of the fixed connecting block away from the fixed guide groove, the force-bearing connecting block is fixedly connected to the other end of the damping rod, the lifting frame is fixedly connected to the middle of the force-bearing connecting block, and the lifting plate is fixedly connected to the top of the lifting frame.

[0010] Furthermore, it also includes an auxiliary tensioning assembly, which consists of a support spring, a telescopic sleeve, an elastic compression plate, a deformation positioning frame, a support rotating plate, a sliding roller, and a return spring; The support spring is fixedly connected to the top center of the lifting plate, the telescopic sleeve is fixedly connected to the lifting plate and located outside the support spring, the elastic compression plate is fixedly connected to the top of the support spring, the deformation positioning frame is fixedly connected to the left and right sides of the top of the lifting plate, the support rotating plate is rotatably connected to the middle of the deformation positioning frame, the sliding roller is rotatably connected to the top of the support rotating plate, and the reset spring is fixedly connected to the right side of the support rotating plate.

[0011] Furthermore, the top of the tension spring contacts the bottom of the fixing component, and the bottom of the tension spring contacts the second fastening bolt. The second fastening bolt can compress the tension spring when it moves. The fixing component has fixing holes corresponding to the first and second fastening bolts. The connecting plate and the elastic sealing plate have connecting holes to accommodate the movement of the second fastening bolt. The drainage channel is tapered, narrow at the top and wide at the bottom, making it difficult for external moisture to reach the concrete repair layer at the bottom of the bridge body through the drainage channel. A sealing ring is provided on the outside of the elastic sealing plate. By setting the sealing ring, external moisture can be prevented from sealing the connection between the side of the elastic sealing plate and the bridge body. The bottom and side of the bridge body have fixing grooves corresponding to the first and second fastening bolts on the outside of the concrete repair layer. The fixing grooves, connecting holes, and fixing holes are on the same axis.

[0012] Furthermore, the left and right sides of the fixed guide groove are provided with interconnected positioning grooves on the same horizontal line. The electric telescopic rod has a telescopic end, which passes through the middle of the top of the threaded connecting shell and the middle of the bottom of the fixed guide groove and extends into the fixed guide groove to contact the bottom of the lifting slider. The electric telescopic rod can support the lifting slider.

[0013] Furthermore, positioning plates are provided at the four corners of the outer side of the fixed guide groove, and threaded grooves that run through the left and right sides are provided on the positioning plates. The fixed guide groove is connected to the bridge body through the threaded grooves on the positioning plates.

[0014] Furthermore, positioning grooves are provided on the left and right sides of the fixed guide groove on the same horizontal line. The positioning grooves and the positioning fixing holes are on the same horizontal line, and can be connected to the bridge body by passing through the fixed guide groove and the positioning fixing holes with extended bolts and extending to the outside of the fixed guide groove.

[0015] Furthermore, auxiliary springs are provided on both the front and rear sides of the bottom of the elastic extrusion plate. The bottom of the auxiliary spring is fixedly connected to the top of the support plate, and the top of the auxiliary spring is fixedly connected to the bottom of the elastic extrusion plate. The top of the telescopic sleeve is in contact with the bottom of the elastic extrusion plate. When the elastic extrusion plate presses upward against the elastic sealing plate, the support spring and the telescopic sleeve can provide support for the middle of the elastic extrusion plate, and the auxiliary spring can automatically compress and store energy along the arc surface of the elastic sealing plate.

[0016] Furthermore, the end of the return spring away from the support plate is fixedly connected to the top of the lifting plate, and the return spring can support the support plate.

[0017] The beneficial effects of this invention are: 1. In this invention, the sealing ring on the outer side of the elastic sealing plate can fit tightly against the bottom of the bridge body to form a physical barrier, effectively preventing external moisture, rainwater or pollutants from penetrating into the concrete repair layer, avoiding the concrete repair layer from getting damp, corroding or cracking again, significantly extending the service life of the repair structure and reducing the need for later maintenance. 2. This invention, by setting up components such as a support plate, a sliding roller, an elastic extrusion plate, and a return spring, can automatically adjust its position when the concrete repair layer naturally shrinks. The sliding roller slides at the bottom of the elastic sealing plate, and in combination with the tension of the return spring, it continuously applies reverse pressure to ensure that the sealing plate is always in close contact with the repair layer. Under the action of the support spring and the telescopic sleeve, the elastic extrusion plate can evenly distribute pressure, adapt to the arc surface changes of the repair layer, avoid local stress concentration, and ensure that the sealing protection of the concrete repair layer does not fail during the shrinkage and shaping process, thus preventing crack recurrence. 3. The design of the damping rod and the force-bearing connecting block in this invention can effectively absorb and reduce bridge vibration, prevent the lifting slider or support structure from loosening or falling off, and the fixing guide groove and subsequent expansion tube fixing steps provide additional mechanical anchoring, ensuring that the entire device remains stable during long-term use, and improving the overall reliability and safety of the device. 4. The electric telescopic pole of this invention, through the cooperative design of the threaded connecting sleeve and the threaded connecting shell, can be easily rotated and disassembled after the concrete repair layer has been shaped. This allows the electric telescopic pole to be reused in multiple repair projects, reducing equipment procurement and replacement costs, thereby significantly reducing the construction budget. This design simplifies the construction process, avoids the waste of special tools, and improves resource utilization. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of an external prestressed reinforcement structure for bridges proposed in this invention. Figure 2 This is a schematic diagram of the fixing component of an external prestressed reinforcement structure for bridges proposed in this invention. Figure 3 This is a schematic diagram of the elastic sealing plate section of an external prestressed reinforcement structure for bridges proposed in this invention. Figure 4 This is a schematic diagram of the exploded structure of two fastening bolts in an external prestressed reinforcement structure for a bridge proposed in this invention. Figure 5 This is a schematic diagram of the cross-sectional structure of the drainage channel in an external prestressed reinforcement structure for bridges proposed in this invention. Figure 6 This is a schematic diagram of the fixed guide groove of an external prestressed reinforcement structure for bridges proposed in this invention. Figure 7 This is a schematic diagram of the exploded structure of the lifting auxiliary frame of the bridge external prestressed reinforcement structure proposed in this invention; Figure 8 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 9 This is a schematic diagram of the stress connection block of an external prestressed reinforcement structure for bridges proposed in this invention. Figure 10 This is a schematic diagram of the top structure of the support plate of an external prestressed reinforcement structure for bridges proposed in this invention.

[0019] In the diagram: 1. Bridge body; 2. Reinforcement components; 201. Fixing component; 202. Fastening bolt one; 203. Fastening bolt two; 204. Tension spring; 205. Connecting cross plate; 206. Elastic sealing plate; 207. Drainage channel; 3. Drive assembly; 301. Fixed guide groove; 302. Threaded connection shell; 303. Electric telescopic rod; 304. Threaded connection sleeve; 305. Lifting slider; 306. Lifting auxiliary frame; 307. Positioning fixing hole; 4. Lifting assembly; 401. Fixed connecting block; 402. Damping rod; 403. Force-bearing connecting block; 404. Lifting frame; 405. Lifting plate; 5. Auxiliary tensioning assembly; 501. Support spring; 502. Telescopic sleeve; 503. Elastic compression plate; 504. Deformation positioning frame; 505. Support rotating plate; 506. Sliding roller; 507. Return spring. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0021] Example 1 refer to Figure 1-5 The present invention provides a technical solution: an external prestressed reinforcement structure for bridges, including a bridge body 1 and a reinforcement component 2.

[0022] The reinforcement component 2 includes: The fastener 201 has a fastening bolt 202 at its lower left side, which is threaded to the bridge body 1. A second fastening bolt 203 is located on the bottom left side of the fastener 201. A tension spring 204 is located on the outside of the second fastening bolt 203 at the bottom of the fastener 201. A connecting plate 205 is located between the top of the fastener 201 and the bottom of the bridge body 1. An elastic sealing plate 206 is fixedly connected to the top of the connecting plate 205. A drainage groove 207 with the top and bottom of the elastic sealing plate 206 is opened inside the elastic sealing plate 206. A concrete repair layer is provided on the top of the elastic sealing plate 206. The top of the second fastening bolt 203 passes through the fastener 201, the connecting plate 205 and the elastic sealing plate 206 and extends into the bridge body 1, where it is threaded to the bridge body 1. This allows the elastic sealing plate 206 to cover the outside of the concrete repair layer at the bottom of the bridge body 1. At the same time, the second fastening bolt 203 can compress the tension spring 204 when it is tightened.

[0023] The top of the tension spring 204 contacts the bottom of the fixing member 201, and the bottom of the tension spring 204 contacts the second fastening bolt 203. When the second fastening bolt 203 moves, it can squeeze the tension spring 204. The fixing member 201 has fixing holes corresponding to the first fastening bolt 202 and the second fastening bolt 203. The connecting plate 205 and the elastic sealing plate 206 have connecting holes to accommodate the movement of the second fastening bolt 203. The drainage groove 207 is tapered in shape, narrow at the top and wide at the bottom, making it difficult for external water vapor to contact the concrete repair layer at the bottom of the bridge body 1 through the drainage groove 207. A sealing ring is provided on the outside of the elastic sealing plate 206. By setting the sealing ring, external water vapor can be prevented from sealing the connection between the side of the elastic sealing plate 206 and the bridge body 1. The bottom and side of the bridge body 1 have fixing grooves corresponding to the first fastening bolt 202 and the second fastening bolt 203 on the outside of the concrete repair layer. The fixing grooves, connecting holes and fixing holes are on the same axis.

[0024] Example 2 refer to Figure 6-7 Based on Embodiment 1, the present invention provides a technical solution that further includes a drive assembly 3, which consists of a fixed guide groove 301, a threaded connecting shell 302, an electric telescopic rod 303, a threaded connecting sleeve 304, a lifting slider 305, a lifting auxiliary frame 306, and a positioning and fixing hole 307.

[0025] A fixed guide groove 301 is located on the inner side of the bottom of the bridge body 1. A threaded connecting shell 302 is fixedly connected to the middle of the bottom of the fixed guide groove 301. An electric telescopic rod 303 is located in the middle of the threaded connecting shell 302. A threaded connecting sleeve 304 is fixedly connected to the top of the outer side of the electric telescopic rod 303. A lifting slider 305 is slidably connected to the inside of the fixed guide groove 301. A lifting auxiliary frame 306 is connected to the lifting slider 305 and fixedly connected to one side of the lifting auxiliary frame 305. A positioning and fixing hole 307 is opened inside the lifting auxiliary frame 306.

[0026] The left and right sides of the fixed guide groove 301 are provided with connected positioning grooves on the same horizontal line. The electric telescopic rod 303 has a telescopic end. The telescopic end of the electric telescopic rod 303 passes through the middle of the top of the threaded connecting shell 302 and the middle of the bottom of the fixed guide groove 301 and extends into the fixed guide groove 301 to contact the bottom of the lifting slider 305. The electric telescopic rod 303 can support the lifting slider 305.

[0027] Positioning plates are provided at the four corners of the outer side of the fixed guide groove 301. The positioning plates have threaded grooves that run through the left and right sides. The fixed guide groove 301 is connected to the bridge body 1 through the threaded grooves on the positioning plates.

[0028] Positioning grooves are provided on the left and right sides of the fixed guide groove 301 on the same horizontal line. The positioning grooves and the positioning fixing holes 307 are on the same horizontal line. The extended bolts can pass through the fixed guide groove 301 and the positioning fixing holes 307 and extend to the outside of the fixed guide groove 301 to connect with the bridge body 1.

[0029] Example 3 refer to Figure 8-10 Based on Embodiment 2, the present invention provides a technical solution that further includes a lifting component 4, which is composed of a fixed connecting block 401, a damping rod 402, a force-bearing connecting block 403, a lifting frame 404, and a lifting plate 405.

[0030] The fixed connecting block 401 is fixedly connected to the middle of the lifting auxiliary frame 306, the damping rod 402 is fixedly connected to the side of the fixed connecting block 401 away from the fixed guide groove 301, the force-bearing connecting block 403 is fixedly connected to the other end of the damping rod 402, the lifting frame 404 is fixedly connected to the middle of the force-bearing connecting block 403, and the lifting plate 405 is fixedly connected to the top of the lifting frame 404.

[0031] It also includes an auxiliary tensioning assembly 5, which consists of a support spring 501, a telescopic sleeve 502, an elastic compression plate 503, a deformation positioning frame 504, a support rotating plate 505, a sliding roller 506, and a return spring 507.

[0032] The support spring 501 is fixedly connected to the top center of the lifting plate 405. The telescopic sleeve 502 is fixedly connected to the lifting plate 405 and located outside the support spring 501. The elastic compression plate 503 is fixedly connected to the top of the support spring 501. The deformation positioning frame 504 is fixedly connected to the left and right sides of the top of the lifting plate 405. The support rotating plate 505 is rotatably connected to the inner center of the deformation positioning frame 504. The sliding roller 506 is rotatably connected to the inner top of the support rotating plate 505. The reset spring 507 is fixedly connected to the right side of the support rotating plate 505.

[0033] Auxiliary springs are provided on both the front and rear sides of the bottom of the elastic compression plate 503. The bottom of the auxiliary spring is fixedly connected to the top of the support plate 405, and the top of the auxiliary spring is fixedly connected to the bottom of the elastic compression plate 503. The top of the telescopic sleeve 502 is in contact with the bottom of the elastic compression plate 503. When the elastic compression plate 503 compresses the elastic sealing plate 206 upward, the support spring 501 and the telescopic sleeve 502 can provide support for the middle part of the elastic compression plate 503, and the auxiliary spring can automatically compress and store energy along the arc surface of the elastic sealing plate 206.

[0034] The end of the return spring 507 away from the support plate 505 is fixedly connected to the top of the lifting plate 405, and the return spring 507 can support the support plate 505.

[0035] When cracks appear in the bottom area of ​​the bridge body 1, the cracks need to be repaired with concrete to form a concrete repair layer. Then, multiple fixing grooves corresponding to fastening bolts 203 and 202 are made on the outside of the concrete repair layer on the bottom and sides of the bridge body 1. The elastic sealing plate 206 is covered on the outside of the concrete repair layer. Then, the fixing holes on the fastener 201 are aligned with the connecting holes on the connecting plate 205 and the elastic sealing plate 206. The connecting plate 205, the elastic sealing plate 206 and the bridge body 1 are connected by fastening bolts 203. At this time, the sealing ring on the outside of the elastic sealing plate 206 can fit against the bottom of the bridge body 1, which can prevent external moisture from entering the upper side of the elastic sealing plate 206 and affecting the concrete repair layer. After the elastic sealing plate 206 is fixed to the bridge body 1, it is connected to the bridge body 1 by fastening bolts 202 on the fastener 201, which can make the connection between fastening bolts 202 and the bridge body 1 more stable.

[0036] A fixing guide groove 301 is provided on the inner side of the bottom of the bridge body 1 between two fixing members 201. The fixing guide groove 301 is connected to the side of the bridge body 1 by fastening bolts, which can fix the fixing guide groove 301 to the bridge body 1. Then, by rotating the electric telescopic rod 303, the threaded connecting sleeve 304 bonded to the outside of the electric telescopic rod 303 can rotate upward within the threaded connecting shell 302, so that it is fixed at the bottom of the fixing guide groove 301. Then, the electric telescopic rod 303 is started. When the electric telescopic rod 303 is working, the lifting slider 305 can be fixed. The slider 305 slides upward within the fixed guide groove 301, while the lifting slider 305 drives the lifting auxiliary frame 306 to rise synchronously within the fixed guide groove 301. At this time, the lifting auxiliary frame 306 drives the fixed connecting block 401, damping rod 402, force-bearing connecting block 403, lifting frame 404, and lifting plate 405 to rise synchronously, causing the lifting plate 405 to move to the underside of the elastic sealing plate 206. At this time, the sliding roller 506 at the top of the lifting plate 405 contacts the bottom of the elastic sealing plate 206. During the upward movement of the lifting plate 405, the distance between the lifting plate 405 and the elastic sealing plate 206 is... The shortening allows the sliding roller 506 to slide at the bottom of the elastic sealing plate 206, while the return spring 507 is stretched. Then, the bottom of the elastic sealing plate 206 contacts the elastic pressing plate 503, which compresses the elastic pressing plate 503 upon contact. This causes the support spring 501 at the bottom of the elastic pressing plate 503 to contract, and simultaneously, the telescopic sleeve 502 is compressed. This allows the elastic pressing plate 503 to conform to the arc surface at the bottom of the elastic sealing plate 206, resulting in more even force distribution. The auxiliary springs located on the front and rear sides of the bottom of the elastic pressing plate 503 can elastically compress along the arc surface of the elastic sealing plate 206. Different extrusion forces are applied to the pressure plate 503. At this time, the pressure applied to the top middle of the elastic extrusion plate 503 is the greatest, which can effectively lift a part of the elastic sealing plate 206. At the same time, due to the stretching of the return spring 507, it can continuously provide the opposite tension to the support rotating plate 505, so that the support rotating plate 505 and the top sliding roller 506 continuously apply pressure to the bottom of the elastic sealing plate 206, ensuring that the elastic sealing plate 206 is more tightly bonded to the concrete repair layer. When the concrete repair layer shrinks, it can synchronously bond and rise to the outside, and protect the concrete repair layer.

[0037] After the concrete repair layer shrinks and sets over a period of time, the electric telescopic rod 303 is controlled to lift the lifting slider 305 and the lifting auxiliary frame 306, allowing the support plate 405 to fit more tightly against the bottom of the elastic sealing plate 206. A mark is then made at this location, and a hole is drilled using an electric hammer and an extended drill rod to insert an expansion tube. Subsequently, an extended bolt is used to pass through the positioning groove on the fixed guide groove 301 and the positioning fixing hole 307 on the lifting auxiliary frame 306, and... The bridge body 1 is fixed inside the expansion tube on its side to fix the position of the lifting auxiliary frame 306. At the same time, the positions of the fixing connecting block 401, damping rod 402, force-bearing connecting block 403, lifting frame 404 and lifting plate 405 can also be fixed, so that the sliding roller 506 on the top of the lifting plate 405 is tightly fitted with the elastic sealing plate 206. When the bridge body 1 vibrates, the force-bearing connecting block 403 can reduce the vibration, preventing the lifting slider 305 from falling off due to excessive vibration, thus enhancing the stability of the device.

[0038] By setting the threaded connecting sleeve 304 and threaded connecting shell 302 on the electric telescopic rod 303, when the concrete repair layer shrinks, the electric telescopic rod 303 can be rotated. At this time, the threaded connecting sleeve 304 rotates inside the threaded connecting shell 302, which can separate the electric telescopic rod 303, the threaded connecting sleeve 304 and the threaded connecting shell 302. Then, the electric telescopic rod 303 can be disassembled from below the fixed guide groove 301, which allows the electric telescopic rod 303 to be used multiple times and reduces the construction budget.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A prestressed bridge reinforcement structure, comprising a bridge body (1), characterized in that: It also includes reinforcement components (2); The reinforcement component (2) includes: The fastener (201) has a fastening bolt (202) at the lower left side. The fastener (201) is threadedly connected to the bridge body (1) through the fastening bolt (202). The fastener (201) has a fastening bolt (203) at the bottom left side. The fastener (201) has a tension spring (204) at the bottom outside the fastening bolt (203). The fastener (201) has a connecting plate (205) between the top of the fastener (201) and the bottom of the bridge body (1). The connecting plate (205) has an elastic sealing plate (206) fixedly connected to the top of the connecting plate (205). The elastic sealing plate (206) has a drainage groove (207) that runs through the top and bottom. The top of the elastic sealing plate (206) is provided with a concrete repair layer. The top of the second fastening bolt (203) passes through the fixing member (201), the connecting plate (205) and the elastic sealing plate (206) and extends into the bridge body (1) and is threadedly connected to the bridge body (1). This allows the elastic sealing plate (206) to cover the outside of the concrete repair layer at the bottom of the bridge body (1). At the same time, the second fastening bolt (203) can compress the tension spring (204) when it is tightened.

2. The bridge external prestressed reinforcement structure according to claim 1, characterized in that: It also includes a drive assembly (3), which consists of a fixed guide groove (301), a threaded connection shell (302), an electric telescopic rod (303), a threaded connection sleeve (304), a lifting slider (305), a lifting auxiliary frame (306), and a positioning fixing hole (307); The fixed guide groove (301) is located on the inner side of the bottom of the bridge body (1). The threaded connecting shell (302) is fixedly connected to the middle of the bottom of the fixed guide groove (301). The electric telescopic rod (303) is located in the middle of the threaded connecting shell (302). The threaded connecting sleeve (304) is fixedly connected to the top of the outer side of the electric telescopic rod (303). The lifting slider (305) is slidably connected to the inside of the fixed guide groove (301). The lifting auxiliary frame (306) is connected to the side of the lifting slider (305). The positioning and fixing hole (307) is opened inside the lifting auxiliary frame (306).

3. The bridge external prestressed reinforcement structure according to claim 2, characterized in that: It also includes a lifting assembly (4), which is composed of a fixed connecting block (401), a damping rod (402), a force-bearing connecting block (403), a lifting frame (404), and a lifting plate (405); The fixed connecting block (401) is fixedly connected to the middle of the lifting auxiliary frame (306), the damping rod (402) is fixedly connected to the side of the fixed connecting block (401) away from the fixed guide groove (301), the force-bearing connecting block (403) is fixedly connected to the other end of the damping rod (402), the lifting frame (404) is fixedly connected to the middle of the force-bearing connecting block (403), and the lifting plate (405) is fixedly connected to the top of the lifting frame (404).

4. The bridge external prestressed reinforcement structure according to claim 3, characterized in that: It also includes an auxiliary tensioning assembly (5), which consists of a support spring (501), a telescopic sleeve (502), an elastic compression plate (503), a deformation positioning frame (504), a support rotating plate (505), a sliding roller (506), and a return spring (507); The support spring (501) is fixedly connected to the top middle of the lifting plate (405), the telescopic sleeve (502) is fixedly connected to the lifting plate (405) and located outside the support spring (501), the elastic compression plate (503) is fixedly connected to the top of the support spring (501), the deformation positioning frame (504) is fixedly connected to the top left and right sides of the lifting plate (405), the support rotating plate (505) is rotatably connected to the inner middle of the deformation positioning frame (504), the sliding roller (506) is rotatably connected to the inner top of the support rotating plate (505), and the reset spring (507) is fixedly connected to the right side of the support rotating plate (505).

5. A bridge external prestressed reinforcement structure according to claim 4, characterized in that: The top of the tension spring (204) contacts the bottom of the fixing member (201), and the bottom of the tension spring (204) contacts the second fastening bolt (203). The second fastening bolt (203) can compress the tension spring (204) when it moves. The fixing member (201) has fixing holes corresponding to the first fastening bolt (202) and the second fastening bolt (203). The connecting cross plate (205) and the elastic sealing plate (206) have connecting holes to accommodate the movement of the second fastening bolt (203). The drainage groove (207) is shaped like... The shape is a cone that is narrow at the top and wide at the bottom, making it difficult for external water vapor to contact the concrete repair layer at the bottom of the bridge body (1) through the drainage channel (207). The outer side of the elastic sealing plate (206) is provided with a sealing ring. By setting the sealing ring, external water vapor can be prevented from sealing the connection between the side of the elastic sealing plate (206) and the bridge body (1). The bottom and side of the bridge body (1) are provided with fixing grooves corresponding to fastening bolt one (202) and fastening bolt two (203) on the outer side of the concrete repair layer. The fixing groove, the connecting hole and the fixing hole are on the same axis.

6. A bridge external prestressed reinforcement structure according to claim 5, characterized in that: The fixed guide groove (301) has interconnected positioning grooves on the left and right sides on the same horizontal line. The electric telescopic rod (303) has a telescopic end. The telescopic end of the electric telescopic rod (303) passes through the middle of the top of the threaded connecting shell (302) and the middle of the bottom of the fixed guide groove (301) and extends into the fixed guide groove (301) to contact the bottom of the lifting slider (305). The electric telescopic rod (303) can support the lifting slider (305).

7. A bridge external prestressed reinforcement structure according to claim 6, characterized in that: The fixed guide groove (301) is provided with positioning plates at the four corners of its outer side. The positioning plates are provided with threaded grooves that run through the left and right sides. The fixed guide groove (301) is connected to the bridge body (1) through the threaded grooves on the positioning plates.

8. A bridge external prestressed reinforcement structure according to claim 7, characterized in that: The fixed guide groove (301) has positioning grooves on the left and right sides on the same horizontal line. The positioning grooves and the positioning fixing holes (307) are on the same horizontal line. The extended bolts can pass through the fixed guide groove (301) and the positioning fixing holes (307) and extend to the outside of the fixed guide groove (301) to connect with the bridge body (1).

9. A bridge external prestressed reinforcement structure according to claim 8, characterized in that: The elastic extrusion plate (503) is provided with auxiliary springs on both the front and rear sides of its bottom. The bottom of the auxiliary spring is fixedly connected to the top of the support plate (405), and the top of the auxiliary spring is fixedly connected to the bottom of the elastic extrusion plate (503). The top of the telescopic sleeve (502) is in contact with the bottom of the elastic extrusion plate (503). When the elastic extrusion plate (503) presses the elastic sealing plate (206) upward, the support spring (501) and the telescopic sleeve (502) can provide support for the middle part of the elastic extrusion plate (503). The auxiliary spring can automatically compress and store energy along the arc surface of the elastic sealing plate (206).

10. A bridge external prestressed reinforcement structure according to claim 9, characterized in that: The end of the return spring (507) away from the support plate (505) is fixedly connected to the top of the lifting plate (405), and the return spring (507) can support the support plate (505).

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