Road and bridge crack reinforcing device and method

Abstract

The invention discloses a road and bridge crack reinforcing device and method.The road and bridge crack reinforcing device comprises a high-strength anti-rust steel beam column, the lower surface of the high-strength anti-rust steel beam column is fixedly connected with a high-strength anti-rust steel I-beam, and the lower surface of the high-strength anti-rust steel I-beam is fixedly connected with a base; an upper-layer left-side bolt and an upper-layer right-side bolt are in threaded connection with the interior of the base, an upper-layer left-side fixing pin and an upper-layer right-side fixing pin penetrate through the interior of the base, a supporting platform is tightly attached to the outer surfaces of the upper-layer left-side fixing pin and the upper-layer right-side fixing pin, and an upper supporting column is fixedly connected to the lower surface of the supporting platform. A rapid splicing groove is formed in the upper supporting column, and a lower supporting column is tightly arranged on the inner surface of the rapid splicing groove in a press fit mode. After being implemented, the device has high structural stability, parts can be conveniently and flexibly replaced, and the device has the good flexible installation performance and the high compatibility effect.

Description

Technical Field

[0001] The present invention relates to the sub-field of road and bridge engineering, and in particular to a road and bridge crack reinforcement device and method. Background Art

[0002] The road and bridge crack reinforcement device is a key technical means to repair damage to bridge structures and improve their service performance. The device effectively bonds and seals the cracks by filling them with high-strength adhesive materials or applying external constraints. This process not only prevents the cracks from further expanding under environmental erosion and load cycles, but also significantly restores the integrity of the structure and improves the bridge's bearing capacity and stiffness. By actively intervening in the development of cracks, this technology can effectively reduce the risk of various structural diseases induced by cracks, thereby significantly extending the safe service life of the bridge. Its core value lies in ensuring the safe passage of roads and bridges under increasing traffic loads and complex environments, while significantly reducing maintenance costs and potential safety hazards throughout the entire life cycle.

[0003] A typical road bridge crack reinforcement device currently in use mainly consists of a support block and a cover plate covering it. Specifically, the cover plate is usually embedded in a fixed groove on the top of the support block, relying on the groove structure to provide positioning and initial support. However, this structural design exposes a key problem in actual application: the insufficient stability of the support block foundation. When subjected to the dynamic load generated by frequent vehicle rolling, the base layer or soil below the support block is prone to plastic deformation or compaction settlement, causing the support block to sink as a whole or in part. This sinking not only destroys the flatness of the device surface, but more importantly, when the wheels pass over the sunken area, it will generate a significant impact load. This additional impact force not only aggravates the damage to the device itself, but also transfers harmful impact energy to the reinforced crack area and surrounding structures, seriously weakening or even offsetting the expected effect of crack reinforcement, becoming a major bottleneck restricting the reliability and durability of the device.

[0004] The sinking of support blocks and the resulting impact effect constitute a key shortcoming in the application effectiveness of existing devices. This defect directly leads to: 1) a significant reduction in the reinforcement effect: continuous impact loads may damage the bonding interface or external constraints within the crack, exposing the crack to the risk of re-expansion; 2) a decrease in driving comfort and safety: uneven road surfaces and impact jolts affect the smoothness of vehicle driving, posing a safety hazard; 3) a shortened lifespan of the device itself: repeated impacts accelerate fatigue damage to the cover plate, support blocks, and their connections; 4) an increase in maintenance frequency and costs: sinking support blocks need to be leveled or replaced more frequently, and may trigger secondary repairs to the cracked area. Therefore, structural optimization to address the core defect of insufficient support block foundation stability, enhance its ability to resist settlement under repeated vehicle loads, and effectively mitigate or eliminate the resulting impact effect are key technical issues that need to be urgently addressed to improve the performance of existing road and bridge crack reinforcement devices and ensure their long-term and reliable service. Summary of the Invention

[0005] This invention introduces a road bridge crack reinforcement device and method, designed to address the key issue in existing technologies: supporting block settlement under repeated vehicle loads leads to uneven road surfaces and additional impact loads, which in turn weaken the crack reinforcement effect, threatening driving safety and the durability of the device. By optimizing the stability of the supporting structure and the load transfer mechanism, this effectively suppresses support block settlement, reduces wheel impact, ensures the long-term reliability of crack reinforcement, and improves bridge traffic safety and maintenance efficiency.

[0006] The present invention provides a road bridge crack reinforcement device, comprising: a high-strength rust-proof steel beam column, the bottom of which is vertically fixedly connected to the upper surface of a high-strength rust-proof steel I-beam; an I-beam groove is provided on the high-strength rust-proof steel I-beam, and the bottom of the high-strength rust-proof steel I-beam is vertically fixedly connected to the upper surface of a base; the upper left bolt and the upper right bolt are symmetrically threaded inside the base, and an upper left fixing pin and an upper right fixing pin are provided through them, and the distance between the axes of the two fixing pins is 3 / 5 of the width of the base; the outer surfaces of the upper left fixing pin and the upper right fixing pin are bidirectionally locked and pressed against the bottom of the support platform, and the corresponding pin body diameter and the pin hole clearance of the support platform are ≤0.05mm; the support The lower surface of the platform is coaxially nested and fixedly connected to the support platform base, and the contact surfaces of the support platform and the support platform base realize three-dimensional mechanical interlocking through interference-fit triangular pins and special-shaped pins; the upper surface of the support platform is matrix-distributed with circular positioning grooves, triangular fixing grooves and special-shaped fixing grooves; the lower surface of the support platform is coaxially fixedly connected to the top of the upper pillar; a stepped quick-joining groove is provided inside the upper pillar; the inner wall of the stepped quick-joining groove is circumferentially tightly pressed against the top flange of the lower pillar, and the splicing groove fixing pin passes vertically through the groove; the bottom of the lower pillar is vertically fixedly connected to the center of the base, and a radial reinforcing rib is provided at the connection; 4 bolt mounting through holes are provided in an annular array inside the base. The reinforcement device of the present invention achieves super stability through a three-dimensional interlocking structure: high-strength I-beams and double bases form a vertical load-bearing core, and the bottom of the support platform is bidirectionally pressed by precisely matched fixing pins to eliminate displacement; the platform and the base adopt an interference interlocking design of triangular pins and special-shaped pins to form a shear-resistant three-dimensional network; the stepped pillar system is combined with transverse locking pins to ensure that the load is evenly transferred to the foundation structure. The entire structure deeply integrates rigid support and flexible locking, significantly improving the overall stiffness and fatigue resistance of the crack area.

[0007] Optimally, the top width of the I-beam slot's inverted trapezoidal cross-section is 1.5-2 times the slot depth, with a 1.5-2mm radius fillet at the bottom. The inner wall is sandblasted to a roughness of Ra 12.5-25μm, and the slot depth is precisely 40% of the total height of the high-strength, rust-resistant steel I-beam. The inverted trapezoidal cross-section, combined with the fillet design at the bottom, significantly improves concrete bite and stress diffusion efficiency. The sandblasted roughened inner wall enhances interfacial bonding, and the precisely controlled slot depth ratio ensures an optimal balance between bending resistance and lightweight construction.

[0008] Optimally, the support platform is provided with circular positioning grooves 1 and 2, each with a depth of 1 / 3 the thickness of the support platform and a 1:50 taper. A cross-shaped guide groove is located at the bottom of the groove, and its diameter matches the diameter of the epoxy resin injection gun nozzle within a ±0.1mm tolerance. The tapered groove walls, combined with the cross-shaped guide groove structure, guide the epoxy resin to quickly form a seamless sealing layer. The precise tolerance matching the injection gun nozzle ensures precise injection of the glue, effectively sealing micro-cracks on the interface and preventing environmental erosion.

[0009] Optimally, the support platform is also equipped with triangular fixing grooves 1, 2, 3, and 4. The bottom width of these grooves is 1 / 2 ± 0.5 mm of the groove opening width, and the spacing between adjacent grooves is 1 / 4 of the length of the short side of the support platform. The groove inner wall roughness Ra ≥ 50 μm, and anti-slip micro-grooves are provided perpendicular to the inclination angle. The anti-slip micro-grooves and the high-roughness groove walls form a mechanical anchoring effect, deeply interlocking the polymer mortar. The equidistant grooves in the matrix ensure uniform stress distribution on the reinforcement units, significantly improving the platform's anti-crushing capacity and load distribution uniformity.

[0010] Optimally, the special-shaped fixing grooves on the support platform include special-shaped fixing grooves 1 and 2. In their L-shaped configuration, the horizontal section length is 1.2 times the width of the triangular fixing groove opening; the top of the vertical section features a stress-diffusion fillet with a radius of 0.5mm; and a carbon fiber plate positioning slot is built into the L-shaped corner, with a depth of 1 / 5 the depth of the vertical section. This invention eliminates localized stress concentrations through the stress-diffusion fillet in the L-shaped structure, while optimizing the horizontal section length to ensure effective anchoring of the carbon fiber plate. The built-in positioning slots enable rapid and precise installation of prestressed components, significantly improving the collaborative efficiency of the reinforcement system.

[0011] Optimally, the triangular pin has a surface hardness of HRC 50-55, and the tolerance between its tooth profile angle and the inclination of the triangular retaining groove is -0.5° to 0°. The L-shaped corners of the special-shaped pin are plated with a 5-8μm thick nickel-based wear-resistant layer, and the clearance between the vertical section and the special-shaped retaining groove is 0.02-0.04mm. The triangular pin's hardness and angle tolerance control ensures full contact and pressure fit with the groove wall. The special-shaped pin coating reduces wear on the L-shaped corners, and the micron-level clearance ensures long-term self-locking in vibration environments, doubling the service life of the three-dimensional interlocking structure.

[0012] Optimally, the splicing slot fixing pin features an annular locking groove in the middle of the pin body, with a depth of 1 / 10 the pin diameter. After installation, both ends of the pin body protrude 3-5mm from the sidewalls of the quick-splicing slot, and the protruding ends are chamfered to prevent loosening. The annular groove design increases the locking contact surface, and the chamfered protruding ends, combined with the shrink-fit installation process, form a bidirectional mechanical stop, completely eliminating the risk of loosening of the support system under dynamic loads.

[0013] A crack reinforcement method based on the above-mentioned reinforcement device comprises the following steps: S1, pre-pressing the support platform: aligning the circular positioning groove 1 and the circular positioning groove 2 of the support platform with the positioning reference surface of the base; applying an initial pre-pressing force of 5 MPa using a hydraulic jack; and locking with bolts in two stages: first tightening the upper left bolt and the upper right bolt to a pre-tightening force of 8 MPa, then increasing the pressure to a final pre-tightening force of 12 ± 0.5 MPa after stabilizing the pressure for 5 minutes; S2. Sealing layer reinforcement: Inject low-viscosity epoxy resin glue (viscosity ≤ 300 cP) into circular positioning grooves 1 and 2 at a controlled rate of 0.2 L / min. Utilize the cross-shaped guide grooves at the bottom of the grooves to ensure that the glue covers the contact interface between the support platform and the base. Apply a -0.08 MPa vacuum pressure to the adjacent triangular fixing grooves until the glue begins to set. Perform a gradient curing process: Initial setting at 25°C for 2 hours → heating at 1°C / min to 60°C → maintaining the temperature for 4 hours to form a shear-resistant sealing layer. S3. Pillar system locking: Apply graphite-based anti-seize lubricant to the top flange of the lower pillar and press it vertically into the stepped quick-joint groove until the contact pressure is ≥ 20kN. After shrinking the splicing groove fixing pin to -50°C with liquid nitrogen, insert it into the pin hole and allow it to expand again at room temperature to form a lateral lock with an interference fit of 0.03-0.06mm. S4. Three-dimensional interlocking of the platform base: Heat the triangular pins to 120°C and insert them into the triangular fixing slots. After cooling and shrinking, achieve a bidirectional compressive stress of ≥15MPa in the slot walls. Apply axial vibration (80Hz frequency, 0.1mm amplitude) to the special-shaped pins while hammering them into place until the gap between the support platform base and the support platform is ≤0.02mm. This reinforcement method uses a step-by-step vacuum infusion and gradient curing process to form a high-strength, shear-resistant sealing layer. Liquid nitrogen shrinking technology achieves zero-gap locking of the support nodes. A hot-insertion and vibration composite process activates the residual compressive stress in the three-dimensional interlocking structure, making the foundation connection system impact-resistant and adaptive.

[0014] Optimizing the aforementioned reinforcement method, the epoxy resin injection volume during the S2 sealing layer reinforcement ensures that the glue overflows onto the edges of triangular fixing grooves 1, 2, 3, and 4, forming a 1-2mm wide sealing edge. This design, where the glue overflows to form a continuous sealing edge, upgrades the passive seal to an active anti-seepage barrier, preventing corrosive media from invading critical load-bearing interfaces.

[0015] Based on the optimization of the above reinforcement method, the load zone reinforcement was performed after S4, including: (1) polymer mortar graded infiltration pressurization: remove the epoxy resin sealing edge overflowing in the triangular fixing groove and inject polymer mortar with a particle size of ≤0.5mm; three-level pressurization: the first level is 2MPa pressure holding for 10min → the second level is 5MPa pressure holding for 20min → the third level is 8MPa pressure holding for 30min, and the pressure decay is ≤5%; (2) prestressed carbon fiber plate intelligent tensioning: insert the carbon fiber plate into the positioning slots of the special-shaped fixing groove 1 and the special-shaped fixing groove 2; dynamic tensioning: tensioning at 5kN / s to 40% of the ultimate strength → holding the load for 180s → increasing to 50% at 2kN / s → anchoring torque 45±2N·m; laser displacement sensor real-time monitoring of the support platform settlement ≤0.05mm. The present invention forms a high-density reinforced core through graded infiltration and pressurization of polymer mortar; the intelligent tensioning of carbon fiber plates is linked with laser monitoring to achieve precise control of prestressing and real-time suppression of crack expansion, giving the reinforcement system dynamic load adaptability.

[0016] The present invention has the following beneficial effects compared to the prior art: 1. The road bridge crack reinforcement device of the present invention significantly improves the overall stiffness and deformation resistance through an innovative three-dimensional mechanical interlocking structure and multiple locking mechanisms. High-precision matching fixing pins are used between the support platform and the base to achieve bidirectional pressing. The interference fit of the triangular pins and special-shaped pins forms a three-dimensional interlocking, which effectively resists shear force and vibration impact. The graded bolt pre-tightening process further ensures the long-term stability of the connection node, greatly reduces the risk of loosening during service, and provides long-lasting and reliable reinforcement support for the crack area of ​​the bridge.

[0017] 2. The device of the present invention adopts a modular pillar system and a precise positioning platform, which greatly simplifies the on-site installation process. The stepped quick-joining grooves and the special fixing pin design realize the fast and stable connection of the pillars. The positioning grooves and fixing grooves distributed in a matrix on the surface of the support platform, combined with the optimized geometry and surface treatment, provide a precise positioning reference for the reinforced components. At the same time, the low-viscosity epoxy resin infusion process under the guidance groove and vacuum assistance ensures the efficient formation of the sealing layer and the coverage without dead angles, significantly shortening the construction period and improving the construction quality.

[0018] 3. The reinforcement method of this invention actively inhibits crack growth through an innovative process: Using a step-by-step vacuum infusion technique, directional negative pressure is applied during the epoxy resin sealing layer formation process, ensuring that the colloid penetrates the interface micro-gaps without blind spots. The pillar system utilizes the principle of temperature differential deformation, achieving a self-locking and stable connection of the splicing nodes through the physical effect of liquid nitrogen shrinking the fixed pins and then expanding them at room temperature. The platform base interlocking stage combines hot embedding and vibration hammering to generate a three-dimensional restraining force between the triangular pins and the special-shaped pins through thermodynamic coupling. Crack control is further enhanced through intelligent grading: Driven by stepped pressure, the polymer mortar is deeply filled into the anti-slip micro-texture structure to form a high-strength reinforcement. The carbon fiber plates are dynamically tensioned, and the prestress is adjusted with real-time laser feedback to form an active constraint mechanism for crack expansion. The entire process transforms material properties and physical effects into structural advantages, significantly improving the dynamic response capability and long-term service performance of the reinforcement system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 A perspective view of the road bridge crack reinforcement device of the present invention; Figure 2 This is a front view of the road bridge crack reinforcement device of the present invention; Figure 3 This is a front view of the road bridge crack reinforcement device of the present invention; Figure 4 A top view of the road bridge crack reinforcement device of the present invention; Figure 5 It is a left view of the road bridge crack reinforcement device of the present invention.

[0020] Legend: 1. High-strength rust-proof steel beam column; 2. High-strength rust-proof steel I-beam; 3. I-beam groove; 4. Circular positioning groove 1; 5. Triangular fixing groove 1; 6. Special-shaped fixing groove 1; 7. Triangular fixing groove 3; 8. Circular positioning groove 2; 9. Upper left fixing pin; 10. Upper right fixing pin; 11. Upper left bolt; 12. Quick splicing groove; 13. Base; 14. Bolt installation hole; 15. Triangular fixing groove 4; 16. Special-shaped fixing groove 2; 17. Upper right bolt; 18. Support platform; 19. Base; 20. Upper pillar; 21. Lower pillar; 22. Triangular pin; 23. Special-shaped pin; 24. Splicing groove fixing pin; 25. Support platform base; 26. Triangular fixing groove 2. DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0022] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 5 The present invention relates to a road bridge crack reinforcement device, which comprises: a high-strength rust-proof steel beam column 1, a high-strength rust-proof steel I-beam 2 is fixedly connected to the lower surface of the high-strength rust-proof steel beam column 1, a base 19 is fixedly connected to the lower surface of the high-strength rust-proof steel I-beam 2, an upper left bolt 11 and an upper right bolt 17 are connected by internal threads of the base 19, an upper left fixing pin 9 and an upper right fixing pin 10 are passed through the interior of the base 19, and a support platform 18 is tightly fitted on the outer surfaces of the upper left fixing pin 9 and the upper right fixing pin 10, and an upper support column 20 is fixedly connected to the lower surface of the support platform 18. A quick-joining groove 12 is provided inside the column 20, and the inner surface of the quick-joining groove 12 is tightly pressed with the lower support 21; the upper surface of the base 19 is fixedly connected with a high-strength rust-proof steel I-beam 2, and the interior of the high-strength rust-proof steel I-beam 2 is provided with an I-beam groove 3; the upper surface of the high-strength rust-proof steel I-beam 2 is fixedly connected with the high-strength rust-proof steel beam column 1, and the interior of the quick-joining groove 12 is penetrated by a splicing groove fixing pin 24; during use, the high-strength rust-proof steel beam column 1, the upper left bolt 11, the upper right bolt 17 and the bolt mounting through hole 14 are used in conjunction with each other, so that the device has strong assembly flexibility.

[0023] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4The support platform 18 is internally provided with a circular positioning groove 1 (4), a circular positioning groove 2 (8); a triangular fixing groove 1 (5), a triangular fixing groove 2 (26), a triangular fixing groove 3 (7), and a triangular fixing groove 4 (15); a special-shaped fixing groove 1 (6), and a special-shaped fixing groove 2 (16); a support base 25 is fixedly connected to the lower surface of the support platform 18, and a triangular pin 22 and a special-shaped pin 23 are tightly connected to the contact surface of the support base 25 and the support platform 18; the lower surface of the lower support column 21 is fixedly connected to the base 13, and a bolt mounting hole 14 is provided inside the base 13. The coordinated use of the circular positioning groove 1 (4), the triangular fixing groove 1 (5), the special-shaped fixing groove 1 (6), the triangular fixing groove 3 (7), the upper left fixing pin 9, and the upper right fixing pin 10 provides the device with strong structural stability and facilitates flexible component replacement, resulting in a flexible installation and strong compatibility.

[0024] Example 1: Crack reinforcement of urban viaduct web Working condition background: A 0.5mm longitudinal crack appeared on the web of a certain city viaduct with a span of 12m and traffic load level I.

[0025] Implementation process: Device installation: Two sets of reinforcement devices were installed at intervals of 8m on both sides of the crack: the base 13 was fixed to the bridge deck with expansion bolts; the inverted trapezoidal cross-section of the I-beam groove 3 (groove depth 40mm, top width 60mm) was embedded in the bridge concrete, and the inner wall was roughened by sandblasting to enhance pull-out resistance; the circular positioning grooves 4, 8 and triangular fixing grooves 5, 7 of the support platform 18 were arranged in a matrix, with a groove spacing of 250mm.

[0026] Sealing and interlocking: low-viscosity epoxy resin is poured into the circular positioning groove, and the glue overflows to form a 1.5mm sealing edge covering the triangular notch; the triangular pin 22 heated to 120°C is inserted into the triangular fixing groove 5, and after cooling, it is used together with the special-shaped pin 23 to achieve three-dimensional interlocking of the platform base.

[0027] Active reinforcement: After removing the sealing edge, polymer mortar was injected into the triangular fixing groove and pressurized to 8 MPa in three levels. The carbon fiber plate was inserted into the 16 positioning slots of the special-shaped groove and tensioned at 5 kN / s to 50% of the ultimate strength. The settlement was monitored by laser at 0.03 mm.

[0028] Effect verification: After 72 hours, the crack closure rate is 95%, and the device displacement under dynamic load test is ≤0.1mm; the penetration depth of polymer mortar reaches the anti-slip micro-texture at the bottom of the groove, and the core compressive strength is 65MPa.

[0029] Example 2: Repair of through-hole joints on coastal highway bridge piers Working Conditions: The piers of a sea-crossing bridge were corroded by salt, resulting in 1.2mm through-cracks. The ambient humidity was >80%, and the bridge needed to withstand typhoon loads.

[0030] Innovation implementation: Corrosion resistance reinforcement: The bottom of the I-beam groove 3 adopts a 2mm large radius design to reduce salt spray stress concentration; the L-shaped corner of the special-shaped pin 23 is plated with an 8μm nickel base layer, and the protruding end of the splicing groove fixing pin 24 is chamfered to prevent loosening.

[0031] Construction in high humidity environment: vacuum negative pressure infusion of epoxy resin (-0.08MPa) to expel moisture from the interface; preheat and dehumidify the carbon fiber plate before tensioning, and extend the dynamic tensioning load holding stage to 240s.

[0032] Typhoon load response: The pillar system adopts liquid nitrogen cold shrinkage pinning technology, with an interference fit of 0.06mm to resist lateral wind vibration; a water-repellent agent is added to the polymer mortar, and after 8MPa pressurized penetration, a reinforced core with a water resistance grade of >P12 is formed.

[0033] Extreme testing: Simulating typhoon conditions (wind pressure 1.1kN / m²): Crack expansion was only 8% of that of the unreinforced structure; Salt spray test for 1000h: Interlocking structure showed no corrosion or loosening, and the pin fit clearance remained ≤0.04mm.

[0034] Example 3: Emergency reinforcement of cracks in the web of a T-beam of a heavy-duty highway bridge Work Background: A 1.8mm diagonal crack appeared on the web of the T-beam of a freight trunk highway bridge. With an average daily heavy-load traffic volume exceeding 5,000 vehicles, reinforcement was required to be completed and traffic was reopened within 48 hours.

[0035] Technical challenges: The cracks are located in the combined bending, moment and shear force zone, and the construction needs to be completed within a 6-hour window at night. After reinforcement, the cracks need to withstand repeated impacts from trucks with an axle load of 35 tons.

[0036] Innovative implementation plan: Quick installation design: Prefabricated modular components are used: the base 13 is pre-embedded with quick-setting anchoring agent; the circular positioning grooves 4 and 8 of the support platform 18 are integrated with laser positioning guides, and can be completed with the base 19 within 5 minutes; the annular groove of the splicing slot fixing pin 24 is pre-installed with memory alloy springs, which self-lock within 3 seconds after cold shrinkage insertion.

[0037] High-efficiency sealing interlocking: Synchronously execute three-step process: vacuum infusion + vibration embedding compound: After injecting epoxy resin, immediately insert the triangular pin 22 preheated at 120℃, and simultaneously start 80Hz vibration to accelerate the penetration of glue.

[0038] Instant forming of the sealing edge: Control the amount of glue overflow to form a 1.2mm continuous sealing edge, and directly inject polymer mortar after covering the triangular notch.

[0039] Dynamic load adjustment of carbon fiber plates: initial tensioning to 40% of the ultimate strength; automatic pressurization when heavy-loaded vehicles pass: when the laser sensor detects that the beam deflection is greater than 0.04mm, the hydraulic system instantly re-tensions it to 45%; during low traffic periods, it is reduced to 38% to delay material fatigue.

[0040] The road and bridge crack reinforcement device and method of this invention utilizes a three-dimensional mechanical interlocking structure, intelligent construction technology, and an active defense system to thoroughly address the three major pain points of traditional crack repair: poor stability, low efficiency, and passive protection. Its modular design adapts to a wide range of scenarios, including urban elevated roads, coastal piers, and heavy-loaded T-beams. It achieves rapid reinforcement in 5.5 hours and a 95% crack closure rate. Under a 35-ton axle load, it controls displacement to ≤0.08mm, improves corrosion and vibration resistance by over 50%, and advances bridge maintenance from "passive repair" to "active preventive reinforcement." This reduces lifecycle maintenance costs by 40%.

[0041] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A road bridge crack reinforcement device, characterized in that: include: A high-strength rust-proof steel beam column (1), the bottom of which is vertically fixedly connected to the upper surface of the high-strength rust-proof steel I-beam (2); The high-strength rust-proof steel I-beam (2) is provided with an I-beam groove (3), and the bottom of the high-strength rust-proof steel I-beam (2) is vertically fixedly connected to the upper surface of the base (19); the upper left bolt (11) and the upper right bolt (17) are symmetrically threaded inside the base (19), and the upper left fixing pin (9) and the upper right fixing pin (10) are provided through the upper left fixing pin (9), and the distance between the two fixing pin axes is 3 / 5 of the base width; the outer surfaces of the upper left fixing pin (9) and the upper right fixing pin (10) are bidirectionally locked and pressed to the bottom of the support platform (18), and the corresponding pin body diameter and the support platform pin hole gap are ≤0.05mm; the lower surface of the support platform (18) is coaxially nested and fixedly connected to the support platform base (25), and the support platform (18) and the support platform are fixedly connected. The contact surface of the platform base (25) realizes three-dimensional mechanical interlocking through the interference fit of the triangular pin (22) and the special-shaped pin (23); the upper surface of the support platform (18) is distributed in a matrix with circular positioning grooves, triangular fixing grooves and special-shaped fixing grooves; the lower surface of the support platform (18) is coaxially fixedly connected to the top of the upper pillar (20); the upper pillar (20) is provided with a stepped quick splicing groove (12); the inner wall of the stepped quick splicing groove (12) is circumferentially tightly pressed against the top flange of the lower pillar (21), and the splicing groove fixing pin (24) vertically passes through the groove; the bottom of the lower pillar (21) is vertically fixedly connected to the center of the base (13), and a radial reinforcing rib is provided at the connection; the base (13) is provided with four bolt mounting through holes (14) in a circular array.

2. The road bridge crack reinforcement device according to claim 1, characterized in that: The top width of the inverted trapezoidal cross-section of the I-beam groove (3) is 1.5-2 times the groove depth, and the groove bottom is provided with a fillet with a radius of 1.5-2 mm; the inner wall is sandblasted to form a roughness of Ra 12.5-25 μm, and the groove depth is precisely 40% of the total height of the high-strength rust-proof steel I-beam (2).

3. The road bridge crack reinforcement device according to claim 1, characterized in that: The support platform (18) is provided with a circular positioning groove (4) and a circular positioning groove (8), the depth of the circular positioning groove (4) and the circular positioning groove (8) is 1 / 3 of the thickness of the support platform (18), and the groove wall has a taper of 1:50; a cross guide groove is provided at the bottom of the groove, and the matching tolerance of the groove diameter and the epoxy resin injection gun nozzle diameter is ±0.1mm.

4. The road bridge crack reinforcement device according to claim 1, characterized in that: The support platform (18) is further provided with a triangular fixing groove 1 (5), a triangular fixing groove 2 (26), a triangular fixing groove 3 (7) and a triangular fixing groove 4 (15). The bottom width of the triangular fixing groove 1 (5), the triangular fixing groove 2 (26), the triangular fixing groove 3 (7) and the triangular fixing groove 4 (15) is 1 / 2±0.5mm of the groove opening width, and the spacing between adjacent grooves is 1 / 4 of the length of the short side of the support platform; the roughness of the inner wall of the groove Ra ≥ 50μm, and anti-slip micro-grooves perpendicular to the inclination angle are provided.

5. The road bridge crack reinforcement device according to claim 1, characterized in that: The special-shaped fixing grooves on the support platform (18) include a special-shaped fixing groove 1 (6) and a special-shaped fixing groove 2 (16). In the L-shaped structure of the special-shaped fixing groove 1 (6) and the special-shaped fixing groove 2 (16), the length of the horizontal section is equal to 1.2 times the width of the triangular fixing groove; the top of the vertical section is provided with a stress diffusion fillet with a radius of 0.5 mm; a carbon fiber plate positioning slot is built-in at the L-shaped corner, and the slot depth is 1 / 5 of the depth of the vertical section.

6. The road bridge crack reinforcement device according to claim 1, characterized in that: The surface hardness of the triangular pin (22) is HRC 50-55, and the tolerance of the tooth angle and the inclination angle of the triangular fixing groove is -0.5°~0°; the L-shaped corner of the special-shaped pin (23) is plated with a 5-8 μm thick nickel-based wear-resistant layer, and the fitting clearance between the vertical section and the special-shaped fixing groove is 0.02-0.04 mm.

7. The road bridge crack reinforcement device according to claim 1, characterized in that: The middle part of the pin body of the splicing groove fixing pin (24) is provided with an annular locking groove, the depth of which is 1 / 10 of the pin diameter; after installation, the length of the protruding ends of the pin body from the side wall of the quick splicing groove (12) is 3-5 mm, and the protruding ends are provided with anti-loosening chamfers.

8. A crack reinforcement method based on the device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Pre-pressing the support platform: align the circular positioning groove 1 (4) and the circular positioning groove 2 (8) of the support platform (18) with the positioning reference surface of the base (19); apply an initial pre-pressing force of 5 MPa using a hydraulic jack; lock the bolts in two stages: first tighten the upper left bolt (11) and the upper right bolt (17) to a pre-tightening force of 8 MPa, then increase the pressure to a final pre-tightening force of 12 ± 0.5 MPa after stabilizing for 5 minutes; S2. Sealing layer reinforcement: Inject low-viscosity epoxy resin glue into the circular positioning groove 1 (4) and the circular positioning groove 2 (8); control the injection speed to 0.2L / min, and use the cross guide groove at the bottom of the groove to make the glue cover the contact interface between the support platform (18) and the base (19); apply a -0.08MPa vacuum negative pressure to the adjacent triangular fixing grooves and continue until the glue begins to solidify; perform gradient curing: initial solidification at 25℃ for 2h → heating to 60℃ at 1℃ / min → keeping warm for 4h to form a shear-resistant sealing layer; S3. Locking of the pillar system: Coat the top flange of the lower pillar (21) with a graphite-based anti-seizure lubricant and press it vertically into the stepped quick splicing groove (12) until the contact pressure is ≥ 20kN; cool the splicing groove fixing pin (24) to -50°C with liquid nitrogen and then insert it into the pin hole, and expand it again at room temperature to form a lateral lock with an interference of 0.03-0.06mm; S4. Three-dimensional interlocking of the platform base: the triangular pin (22) is heated to 120°C and inserted into the triangular fixing groove, and after cooling and shrinkage, the bidirectional compressive stress of the groove wall is ≥15MPa; the special-shaped pin (23) is subjected to axial vibration and hammered to embed it until the gap between the support platform base (25) and the support platform (18) is ≤0.02mm.

9. The crack reinforcement method according to claim 8, characterized in that: In the strengthening of the S2 sealing layer, the amount of epoxy resin glue injected satisfies the following requirements: the glue overflows to the edges of the triangular fixing groove 1 (5), triangular fixing groove 2 (26), triangular fixing groove 3 (7), and triangular fixing groove 4 (15) to form a 1-2 mm wide sealing edge.

10. The crack reinforcement method according to claim 8, characterized in that: After S4, the load zone reinforcement is performed, including: 1) polymer mortar graded infiltration pressurization: remove the epoxy resin sealing edge overflowing in the triangular fixing groove and inject polymer mortar with a particle size of ≤0.5mm; three-level pressurization: first level 2MPa pressure maintenance for 10min → second level 5MPa pressure maintenance for 20min → third level 8MPa pressure maintenance for 30min, pressure decay ≤5%; 2) prestressed carbon fiber plate intelligent tensioning: insert the carbon fiber plate into the positioning slots of the special-shaped fixing groove 1 (6) and the special-shaped fixing groove 2 (16); dynamic tensioning: tensioning at 5kN / s to 40% of the ultimate strength → holding the load for 180s → increasing to 50% at 2kN / s → anchoring torque 45±2N·m; laser displacement sensor real-time monitoring of the support platform settlement ≤0.05mm.

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