Road and bridge crack reinforcing structure

Abstract

The invention relates to the technical field of bridge construction, and discloses a road bridge crack reinforcing structure which comprises a reinforcing assembly and an anchoring plate, prestressed reinforcements are fixed to the anchoring plate, pulleys are arranged at the tops of the prestressed reinforcements, connecting frames are rotationally connected to the outer sides of the pulleys, threaded rods are fixed to the bottoms of the connecting frames, and the threaded rods are connected with the reinforcing assembly. The outer side of the threaded rod is in threaded connection with a threaded sleeve, the bottom of the threaded sleeve is rotationally connected with a movable block, a fixed block is fixed to the bottom of the movable block, a positioning plate is arranged on the top of the fixed block, and a through groove is formed in the positioning plate. The device has the beneficial effects that through the arrangement of the adjusting assembly, when a bridge vibrates, the pre-tightening force applying position of the prestressed reinforcement can be transversely adjusted, then the dynamically-changed stress state of a beam body and the crack stress concentration position can be matched in real time when the bridge vibrates, the pre-tightening force is accurately applied, crack expansion is effectively restrained, and the crack expansion rate is increased. And the reinforcing effect is stable.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a structure for reinforcing cracks in road bridges. Background Technology

[0002] During long-term service, bridge structures are subject to repeated vehicle loads, environmental erosion, and other factors, making them highly susceptible to cracks in critical load-bearing components such as beams and piers. The presence of cracks not only weakens the load-bearing capacity and stiffness of the components, leading to increased structural deflection and excessive deformation, but also exacerbates the erosion of internal steel bars by environmental media, causing a chain of damage such as steel bar corrosion and concrete spalling. In severe cases, this can lead to bridge structural failure or even collapse. Therefore, timely and effective reinforcement and repair of cracked bridges is of paramount importance.

[0003] External prestressed tendon reinforcement technology has become one of the mainstream technologies in the field of bridge crack reinforcement due to its advantages such as convenient construction, significant reinforcement effect, minimal disturbance to the original structure, and the ability to adjust the prestress as needed. This technology involves setting prestressed steel bars on the outside of bridge components and applying pre-tensioning force using tensioning equipment, which causes the prestressed steel bars to generate tensile force, thereby forming a reverse support force on the concrete beam. This effectively counteracts the tensile stress caused by the load, inhibits crack propagation, and promotes the closure of microcracks. At the same time, it significantly improves the bending and shear bearing capacity and overall stiffness of the components, and extends the service life of the bridge.

[0004] When a bridge vibrates due to vehicle traffic, wind loads, etc., the stress state of the beam changes dynamically with the vibration, and the stress concentration location in the crack area also shifts accordingly. If the tensioning equipment cannot adjust the position of the prestressing force applied to the prestressed steel bars laterally and is only fixed in a single area, it will lead to an imbalance between prestress and force. During vibration, the high stress area of ​​the beam will shift, and the prestressing force at the fixed position cannot accurately cover the new stress concentration point. The suppressed cracks are prone to expand again due to stress release, and the reinforcement effect will fail. Moreover, the continuous prestressing force at the fixed position interacts with the beam deformation caused by vibration, forming a local additional bending moment, which exacerbates the risk of concrete splitting under the anchor and may even induce new cracks. Summary of the Invention

[0005] In view of the problems existing in the above and / or existing road and bridge crack reinforcement structures, the present invention is proposed.

[0006] Therefore, the problem to be solved by this invention is that when a bridge vibrates, the position of the prestressed steel bar pretensioning force cannot be adjusted laterally, which causes the pretensioning force to be unable to match the dynamic changes in the stress of the beam and the stress concentration position of the cracks. This not only weakens the reinforcement effect, accelerates the loss of prestress and fatigue damage of components, but may also induce new structural damage.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a road and bridge crack reinforcement structure, comprising a reinforcement component including an anchor plate, a prestressed steel bar fixed on the anchor plate, a pulley provided on the top of the prestressed steel bar, a connecting frame rotatably connected to the outside of the pulley, a threaded rod fixed on the bottom of the connecting frame, a threaded sleeve threadedly connected to the outside of the threaded rod, a movable block rotatably connected to the bottom of the threaded sleeve, a fixed block fixed to the bottom of the movable block, a positioning plate provided on the top of the fixed block, a through groove provided on the positioning plate, and the movable block movably connected to the through groove; An adjustment component, disposed on the positioning plate, includes a driving component, the driving component including a reciprocating roller located at the top of the positioning plate, a motor disposed at the end of the reciprocating roller, a rotating sleeve rotatably connected inside the movable block, a fixed shaft fixed inside the rotating sleeve, and the fixed shaft meshing with the reciprocating roller.

[0008] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, the driving component further includes a vibration sensor, which is installed and fixed on one side of the bridge.

[0009] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, the adjusting component further includes a rotating component, the rotating component including a gear fixed to the outside of the threaded sleeve, and a toothed plate fixed on one side of the positioning plate.

[0010] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, the adjusting component further includes a limiting member, the limiting member including a plate inserted into the movable block, and a slot provided on the rotating sleeve, wherein the plate engages with the slot.

[0011] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, wherein: a fixing column is fixed on one side of the insert plate, a force-bearing block is fixed at the end of the fixing column, a support rod is fixed on the top of the positioning plate, and an extrusion block is fixed on the top of the support rod.

[0012] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, the compression blocks are triangular in shape and there are multiple of them, which are evenly distributed in a straight line on the top of the support rod, and the compression blocks cooperate with the force-bearing blocks.

[0013] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, the adjustment component further includes a delaying element, the delaying element includes a positioning sleeve fixed to one side of the movable block, a piston plate is fixed to the outside of the fixing column, a spring is fixed to one side of the piston plate, and the other end of the spring is fixed to the inner wall of the positioning sleeve.

[0014] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, the positioning sleeve is provided with a ventilation groove on one side, a baffle is hinged to one side of the positioning sleeve, and a ventilation hole is provided on the baffle.

[0015] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, the number of slots is multiple, and they are evenly distributed in a ring on the outside of the rotating sleeve.

[0016] As a preferred embodiment of the road and bridge crack reinforcement structure of the present invention, both the anchor plate and the positioning plate are fixed to the bridge by bolts.

[0017] The beneficial effects of this invention are as follows: by adjusting the settings of the components, when the bridge vibrates, the position of the prestressing force of the prestressed steel bars can be adjusted laterally, thereby matching the dynamic stress state of the beam and the stress concentration position of the cracks during bridge vibration in real time, accurately applying the prestressing force, effectively suppressing crack propagation, and ensuring stable reinforcement effect.

[0018] Furthermore, it avoids the additional bending moment generated by the fixed application position and the vibration deformation of the beam, reduces the risk of concrete splitting under the anchor, prevents the induction of new damage, and at the same time reduces the repeated friction between the prestressing tendon and the application position, slows down the wear of the protective layer and the generation of alternating stress, extends the service life of the tendon, and reduces the loss of prestress. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 An overall structural diagram of a road and bridge crack reinforcement structure.

[0020] Figure 2 A structural diagram of an adjustment component for reinforcing cracks in roads and bridges.

[0021] Figure 3 A structural diagram of a movable block for reinforcing cracks in roads and bridges.

[0022] Figure 4 Reinforcement structures for road and bridge cracks Figure 3 Enlarged view of the structure at point A in the middle.

[0023] Figure 5 A cross-sectional view of the movable block structure used in road and bridge crack reinforcement.

[0024] Figure 6 Reinforcement structures for road and bridge cracks Figure 5Enlarged view of the structure at point B in the middle. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1 Reference Figures 1-3 and Figure 5 This is the first embodiment of the present invention. This embodiment provides a road and bridge crack reinforcement structure. The road and bridge crack reinforcement structure includes a reinforcement component 1, including two anchor plates 11, both of which are connected to the bridge by bolts. They can be fixed at designated positions on the bridge as needed according to the actual situation of the bridge cracks. Prestressed steel bars 12 are fixed on the anchor plates 11, and both ends of the prestressed steel bars 12 are fixed to the two anchor plates 11 by nuts.

[0029] A pulley 13 is provided at the top of the prestressed steel bar 12. The pulley 13 is snapped into the top of the prestressed steel bar 12. A connecting frame 14 is rotatably connected to the outside of the pulley 13. A threaded rod 15 is fixed at the bottom of the connecting frame 14. A threaded sleeve 16 is threadedly connected to the outside of the threaded rod 15. A hexagonal nut is fixed to the outside of the threaded sleeve 16, which allows workers to rotate the threaded sleeve 16 using tools. A movable block 17 is rotatably connected to the bottom of the threaded sleeve 16. A fixed block 18 is fixed to the bottom of the movable block 17. A positioning plate 19 is provided at the top of the fixed block 18. The positioning plate 19 is fixed to the bridge by bolts. A through groove 19-1 is opened on the positioning plate 19. The movable block 17 is movably connected to the through groove 19-1.

[0030] During construction, two anchor plates 11 are fixed to both ends of the bridge with bolts. Then, the two ends of the prestressed steel bars 12 are fixed to the anchor plates 11. After that, the positioning plate 19 is fixed to the lower position in the middle of the bridge with bolts, and the pulley 13 is hung on the top of the prestressed steel bars 12. Then, the movable block 17 passes through the through groove 19-1 from the bottom of the positioning plate 19, so that the threaded rod 15 is connected to the threaded sleeve 16. At the same time, the top of the fixing block 18 contacts the positioning plate 19. At this time, the threaded sleeve 16 can be rotated to drive the threaded rod 15 to move downward. When the threaded rod 15 moves, it will apply a pulling force to the prestressed steel bars 12 through the pulley 13, forcing the prestressed steel bars 12 to be actively tensioned, providing an upward support force for the bridge, thereby strengthening the bridge.

[0031] The structure corresponding to the pulley 13 is two sets, located on both sides of the top of the prestressed steel bar 12. The two sets of pulleys 13 are installed in the same steps. By setting the two pulleys 13, the prestressed steel bar 12 can be subjected to symmetrical compression, and the force is distributed along the axis without lateral offset. In addition, by setting the pulleys 13, the friction between the pulleys and the prestressed steel bar 12 can be reduced, so as to avoid affecting its movement and adjustment.

[0032] Adjustment component 2, set on positioning plate 19, includes drive component 21. Drive component 21 includes reciprocating roller 211 located at the top of positioning plate 19. Reciprocating roller 211 has two sections, which correspond to two movable blocks 17 respectively. A stabilizing block is fixed at the top of positioning plate 19. Reciprocating roller 211 is rotatably connected to the stabilizing block through bearings. A motor 212 is set at the end of reciprocating roller 211. The output shaft of motor 212 is fixed to reciprocating roller 211. A rotating sleeve 213 is rotatably connected inside the movable block 17. A fixed shaft 214 is fixed inside the rotating sleeve 213. The fixed shaft 214 meshes with reciprocating roller 211.

[0033] The drive unit 21 also includes a vibration sensor 215, which is installed and fixed on one side of the bridge. The vibration sensor 215 is electrically connected to the motor 212 and is used to control the opening and closing of the motor 212.

[0034] When there are too many vehicles traveling on the bridge, causing significant vibration, the vibration sensor 215 collects vibration signals and activates the motor 212. The motor 212 drives the reciprocating roller 211 to rotate. The reciprocating roller 211, in conjunction with the fixed shaft 214, drives the rotating sleeve 213 to move. The rotating sleeve 213 then drives the movable block 17 to move, which in turn drives the pulley 13 to move. This allows for lateral adjustment of the position where the prestressing force of the prestressed steel bars 12 is applied. This allows for real-time matching of the dynamic stress state of the beam and the location of stress concentration in the cracks during bridge vibration, enabling precise application of the prestressing force, effectively suppressing crack propagation, and ensuring stable reinforcement results.

[0035] Furthermore, by moving the pulleys 13 to both sides, the dynamic changes in stress and the location of stress concentration in the cracks during beam vibration can be precisely matched, thereby improving the targeted nature of the reinforcement, avoiding eccentric bending moments by symmetrical force, dispersing the reaction force under the anchor, preventing local damage to the beam, expanding the range of prestress adjustment, and adapting to different vibration intensity requirements.

[0036] When the bridge stops vibrating, the motor 212 will shut off and stop moving and adjusting the pulley 13, avoiding ineffective adjustment, reducing mechanical wear and energy consumption, extending component life, accurately responding to dynamic vibration conditions, reducing unnecessary disturbance to the structure, adapting to the intermittent vibration characteristics of vehicles, and achieving reinforcement as needed.

[0037] Example 2 Reference Figures 2-6 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0038] Specifically, the adjusting component 2 also includes a rotating component 22, the number of which corresponds to the number of threaded sleeves 16. The rotating component 22 includes a gear 221 fixed to the outside of the threaded sleeve 16. A toothed plate 222 is fixed on one side of the positioning plate 19. In the initial state, the gear 221 does not mesh with the toothed plate 222, so it does not hinder the rotation of the threaded sleeve 16. When the movable block 17 moves toward the end of the bridge, the gear 221 will mesh with the toothed plate 222 and drive the threaded sleeve 16 to rotate with the cooperation of the toothed plate 222. At this time, the threaded sleeve 16 will drive the threaded rod 15 to move upward and adaptively reduce the tension on the prestressed steel bar 12, thereby avoiding excessive prestress that could cause excessive arching of the beam and cracking of the top surface. It can also maintain the same prestress at all times, avoiding stress fluctuations that could accelerate the fatigue of the prestressed tendons and anchorage system.

[0039] Specifically, the adjustment component 2 also includes a limiting member 23. The number of limiting members 23 corresponds to the number of movable blocks 17. The limiting member 23 includes a plate 231 inserted into the movable block 17. A slot 213-1 is provided on the rotating sleeve 213. The plate 231 engages with the slot 213-1. The two cooperate to limit the rotating sleeve 213 so that it cannot rotate. Thus, when the reciprocating roller 211 rotates, the rotating sleeve 213 can move axially. There are multiple slots 213-1, which are evenly distributed in a ring on the outside of the rotating sleeve 213.

[0040] Specifically, a fixing post 232 is fixed on one side of the insertion plate 231, a force-bearing block 233 is fixed at the end of the fixing post 232, a support rod 234 is fixed on the top of the positioning plate 19, and a pressing block 235 is fixed on the top of the support rod 234.

[0041] Specifically, the extrusion blocks 235 are triangular in shape and there are multiple of them, which are evenly distributed in a straight line on the top of the support rod 234. The extrusion blocks 235 cooperate with the force-bearing blocks 233.

[0042] When the movable block 17 moves, it will drive the force-bearing block 233 to approach the extrusion block 235. At this time, the inclined surface of the extrusion block 235 will apply a reverse thrust to the force-bearing block 233, and cause the force-bearing block 233 to drive the fixed column 232 and the insert plate 231 to move, so that the insert plate 231 moves to the outside of the slot 213-1. When the force-bearing block 233 is at the end of the inclined surface of the extrusion block 235, the insert plate 231 will separate from the slot 213-1. At this time, the movable block 17 will continue to drive the force-bearing block 233 to completely separate from the extrusion block 235 under inertia. At the same time, the rotating sleeve 213 is released from its limit, so that it can rotate with the reciprocating roller 211. This allows the movable block 17 to stop moving after moving a certain distance, avoiding the stress impact caused by continuous movement, so that the beam and the prestressed tendon can be smoothly transferred to the stress, making it easier for the structure to adapt to the new stress state and preventing cracks from expanding due to sudden stress changes.

[0043] Example 3 Reference Figure 4 and Figure 6 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0044] Specifically, the adjustment component 2 also includes a delaying element 24, which includes a positioning sleeve 241 fixed to one side of the movable block 17, a piston plate 242 fixed to the outside of the fixing post 232, the piston plate 242 fitting against the inner wall of the positioning sleeve 241, a spring 243 fixed to one side of the piston plate 242, and the other end of the spring 243 fixed to the inner wall of the positioning sleeve 241.

[0045] Specifically, a ventilation groove 241-1 is provided on one side of the positioning sleeve 241, and a baffle 244 is hinged to one side of the positioning sleeve 241. A ventilation hole 244-1 is provided on the baffle 244. The diameter of the ventilation groove 241-1 is relatively large, and the diameter of the ventilation hole 244-1 is relatively small.

[0046] When the force-bearing block 233 moves under the reverse thrust of the compression block 235, the fixed column 232 will drive the piston plate 242 to compress the spring 243. At the same time, the airflow generated when the piston plate 242 moves will push the baffle 244 to open. At this time, the airflow will be discharged outward through the vent groove 241-1, without hindering the normal movement of the piston plate 242.

[0047] When the force-bearing block 233 separates from the pressing block 235, the spring 243 pushes the piston plate 242 to move, and through the piston plate 242 drives the fixed column 232 and the insert plate 231 to move, so that the insert plate 231 can be inserted into the slot 213-1 again. At this time, air is only introduced into the positioning sleeve 241 through the small vent hole 244-1, which can generate negative pressure when the piston plate 242 moves, and create resistance to its movement, thus delaying the insertion of the insert plate 231 into the slot 213-1, so that the pulley 13 can stay in the current position for a sufficient time.

[0048] In use, two anchor plates 11 are fixed to both ends of the bridge with bolts. Then, the two ends of the prestressed steel bars 12 are fixed to the anchor plates 11. After that, the positioning plate 19 is fixed to the lower position in the middle of the bridge with bolts, and the pulley 13 is hung on the top of the prestressed steel bars 12. Then, the movable block 17 passes through the through groove 19-1 from the bottom of the positioning plate 19, so that the threaded rod 15 is connected to the threaded sleeve 16. At the same time, the top of the fixing block 18 contacts the positioning plate 19. At this time, the threaded sleeve 16 can be rotated to drive the threaded rod 15 to move downward. When the threaded rod 15 moves, it will apply a pulling force to the prestressed steel bars 12 through the pulley 13, forcing the prestressed steel bars 12 to be actively tensioned, providing an upward support force for the bridge, thereby strengthening the bridge.

[0049] When there are too many vehicles traveling on the bridge, causing significant vibration, the vibration sensor 215 collects vibration signals and activates the motor 212. The motor 212 drives the reciprocating roller 211 to rotate. The reciprocating roller 211, in conjunction with the fixed shaft 214, drives the rotating sleeve 213 to move. The rotating sleeve 213 then drives the movable block 17 to move, which in turn drives the pulley 13 to move. This allows for lateral adjustment of the position where the prestressing force of the prestressed steel bars 12 is applied. This allows for real-time matching of the dynamic stress state of the beam and the location of stress concentration in the cracks during bridge vibration, enabling precise application of the prestressing force, effectively suppressing crack propagation, and ensuring stable reinforcement results.

[0050] When the movable block 17 moves toward the end of the bridge, the gear 221 will mesh with the toothed plate 222 and drive the threaded sleeve 16 to rotate under the cooperation of the toothed plate 222. At this time, the threaded sleeve 16 will drive the threaded rod 15 to move upward and adaptively reduce the tension on the prestressed steel bar 12, thereby avoiding excessive prestress that could cause excessive arching of the beam and cracking of the top surface. It can also maintain the same prestress at all times, avoiding stress fluctuations that could accelerate the fatigue of the prestressed tendons and anchorage system.

[0051] When the movable block 17 moves, it will drive the force-bearing block 233 to approach the extrusion block 235. At this time, the inclined surface of the extrusion block 235 will apply a reverse thrust to the force-bearing block 233, and cause the force-bearing block 233 to drive the fixed column 232 and the insert plate 231 to move, so that the insert plate 231 moves to the outside of the slot 213-1. When the force-bearing block 233 is at the end of the inclined surface of the extrusion block 235, the insert plate 231 will separate from the slot 213-1. At this time, the movable block 17 will continue to drive the force-bearing block 233 to completely separate from the extrusion block 235 under inertia. At the same time, the rotating sleeve 213 is released from its limit, so that it can rotate with the reciprocating roller 211. This allows the movable block 17 to stop moving after moving a certain distance, avoiding the stress impact caused by continuous movement, so that the beam and the prestressed tendon can be smoothly transferred to the stress, making it easier for the structure to adapt to the new stress state and preventing cracks from expanding due to sudden stress changes.

[0052] When the bridge stops vibrating, the motor 212 will shut off and stop moving and adjusting the pulley 13, avoiding ineffective adjustment, reducing mechanical wear and energy consumption, extending component life, accurately responding to dynamic vibration conditions, reducing unnecessary disturbance to the structure, adapting to the intermittent vibration characteristics of vehicles, and achieving reinforcement as needed.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A road and bridge crack reinforcement structure, characterized in that: include, The reinforcement component (1) includes an anchor plate (11), on which a prestressed steel bar (12) is fixed. A pulley (13) is provided on the top of the prestressed steel bar (12). A connecting frame (14) is rotatably connected to the outside of the pulley (13). A threaded rod (15) is fixed at the bottom of the connecting frame (14). A threaded sleeve (16) is threadedly connected to the outside of the threaded rod (15). A movable block (17) is rotatably connected to the bottom of the threaded sleeve (16). A fixed block (18) is fixed at the bottom of the movable block (17). A positioning plate (19) is provided on the top of the fixed block (18). A through groove (19-1) is provided on the positioning plate (19). The movable block (17) is movably connected to the through groove (19-1). Adjustment component (2) is set on the positioning plate (19) and includes a drive component (21). The drive component (21) includes a reciprocating roller (211) located at the top of the positioning plate (19). A motor (212) is provided at the end of the reciprocating roller (211). A rotating sleeve (213) is rotatably connected inside the movable block (17). A fixed shaft (214) is fixed inside the rotating sleeve (213). The fixed shaft (214) meshes with the reciprocating roller (211).

2. The road and bridge crack reinforcement structure as described in claim 1, characterized in that: The drive unit (21) also includes a vibration sensor (215), which is mounted and fixed on one side of the bridge.

3. The road and bridge crack reinforcement structure as described in claim 2, characterized in that: The adjustment assembly (2) also includes a rotating component (22), which includes a gear (221) fixed to the outside of the threaded sleeve (16), and a toothed plate (222) is fixed on one side of the positioning plate (19).

4. The road and bridge crack reinforcement structure as described in claim 2 or 3, characterized in that: The adjustment component (2) also includes a limiting member (23), which includes a plug plate (231) inserted into the movable block (17). The rotating sleeve (213) has a slot (213-1) and the plug plate (231) engages with the slot (213-1).

5. The road and bridge crack reinforcement structure as described in claim 4, characterized in that: A fixing post (232) is fixed on one side of the insert plate (231), and a force-bearing block (233) is fixed at the end of the fixing post (232). A support rod (234) is fixed on the top of the positioning plate (19), and a pressing block (235) is fixed on the top of the support rod (234).

6. The road and bridge crack reinforcement structure as described in claim 5, characterized in that: The extrusion blocks (235) are triangular in shape and there are multiple of them. They are evenly distributed in a straight line on the top of the support rod (234). The extrusion blocks (235) cooperate with the force-bearing blocks (233).

7. The road and bridge crack reinforcement structure as described in claim 5 or 6, characterized in that: The adjustment assembly (2) also includes a delaying element (24), which includes a positioning sleeve (241) fixed to one side of the movable block (17), a piston plate (242) fixed to the outside of the fixing column (232), a spring (243) fixed to one side of the piston plate (242), and the other end of the spring (243) fixed to the inner wall of the positioning sleeve (241).

8. The road and bridge crack reinforcement structure as described in claim 7, characterized in that: The positioning sleeve (241) has a ventilation groove (241-1) on one side, and a baffle (244) is hinged to one side of the positioning sleeve (241). The baffle (244) has a ventilation hole (244-1).

9. The road and bridge crack reinforcement structure as described in claim 8, characterized in that: There are multiple slots (213-1), which are evenly distributed in a ring on the outside of the rotating sleeve (213).

10. The road and bridge crack reinforcement structure as described in claim 8 or 9, characterized in that: Both the anchor plate (11) and the positioning plate (19) are fixed to the bridge by bolts.

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