An assembled expansion device for bridge end joint

Abstract

The present application relates to the technical field of bridge engineering structure, especially to a kind of assembly type expansion device for bridge beam end connecting joint, it includes main force frame component and detachable tension adjusting component;Main force frame component contains left and right anchoring base and central load-bearing beam, and it is installed by dry connection to realize no wet operation;Tension adjusting component includes elastic wear-resistant component and displacement compensation slider group, displacement slider is driven by servo motor and can be independently replaced, and it is dynamically adapted to beam end deformation by cooperating with pre-tightening adjusting mechanism.The present application can realize quick assembly, intelligent adjustment and single module replacement, significantly improve construction efficiency and maintenance convenience.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a prefabricated expansion joint for use at the connection joint of bridge beam ends. Background Technology

[0002] In the field of bridge engineering structural technology, expansion joints at bridge beam end joints are crucial components for regulating the expansion and contraction of bridge structures caused by factors such as temperature changes and vehicle loads. The durability and maintainability of these structures directly affect the bridge's service performance and traffic efficiency. Traditional bridge expansion joint devices generally employ an integral construction. This method requires welding anchoring steel bars into pre-reserved slots at the beam ends during installation, followed by on-site pouring of high-strength concrete for fixation, ensuring a stable connection between the expansion joint and the bridge structure.

[0003] However, this integrated structure has revealed many limitations in practical applications. On the one hand, on-site wet work not only has a long construction period but is also highly susceptible to environmental conditions such as temperature and humidity, posing significant challenges to schedule control and construction organization. For example, the pre-embedded base assembly and replacement expansion joint structure mentioned in Chinese Patent Application No. 201810224787.8, although improving the convenience of replacement through the design of pre-embedded bases and detachable components, still has not completely escaped the constraints of on-site wet work. On the other hand, when the seals of the expansion joint device age or the steel is damaged, the repair process usually requires closing part of the lane, removing the existing concrete, and re-pouring it. This process is not only cumbersome but also has a significant impact on traffic and increases transportation costs. As described in Chinese Patent Application No. 201911346744.8, a prefabricated bridge expansion joint device simplifies the installation process through the combination design of anchored concrete blocks and comb plates, but may still involve wet work such as concrete removal during maintenance. Furthermore, the lack of modular redundancy design in the monolithic structure means that once a local component fails, it often affects the normal operation of the entire expansion joint system, reducing the system's reliability and durability.

[0004] Based on this, the present invention proposes a novel prefabricated expansion joint device for bridge beam end connection joints. This prefabricated expansion joint device can meet the needs of modern bridges for efficient operation and maintenance and low-disruption construction. Through modular design and dry connection technology, it can realize the rapid installation and replacement of expansion joint devices, reduce the impact on the normal operation of the bridge, and improve the overall performance and traffic efficiency of the bridge. Summary of the Invention

[0005] The present invention aims to solve the problems of traditional bridge expansion joint devices, which rely on on-site wet operations, are difficult to replace individual modules independently, cause disturbance to residents during maintenance, and have low construction efficiency.

[0006] To address the above problems, the present invention provides an assembled expansion joint for bridge beam end connection joints, comprising:

[0007] The main load-bearing frame assembly and the tension adjustment assembly detachably connected to the main load-bearing frame assembly;

[0008] The main load-bearing frame assembly includes a left anchor base and a right anchor base, as well as a central load-bearing beam disposed on the left anchor base and the right anchor base;

[0009] The tension adjustment assembly includes an elastic wear-resistant component set on the central load-bearing beam, and a displacement compensation slider group located below the elastic wear-resistant component and slidably connected to the central load-bearing beam. A pre-tightening adjustment mechanism is provided on the displacement compensation slider group, and the displacement compensation slider group forms an adjustable locking connection with the central load-bearing beam through the pre-tightening adjustment mechanism.

[0010] Both the left and right anchoring bases include anchoring plates pre-embedded at the ends of the bridge beams and several positioning pins vertically fixed on the anchoring plates, as well as several threaded blind holes opened on the anchoring plates. The two ends of the central load-bearing beam are respectively provided with positioning sleeves that are inserted and matched with the positioning pins and through holes corresponding to the threaded blind holes. High-strength preloaded bolts are inserted in the through holes. The left and right anchoring bases are fixedly connected to the central load-bearing beam through high-strength preloaded bolts, threaded blind holes and through holes.

[0011] Preferably, the central load-bearing beam includes a main beam body, on which a T-shaped groove is formed along the longitudinal direction, and a guide rack is provided on the side wall of the T-shaped groove.

[0012] The displacement compensation slider assembly includes at least two displacement sliders that are slidably connected in a T-shaped groove. At the bottom of the displacement slider, there is a drive gear that meshes with a guide rack and a miniature servo motor that drives the drive gear to rotate. The displacement slider moves longitudinally along the T-shaped groove through the drive gear and the guide rack.

[0013] Preferably, the elastic wear-resistant component includes a rubber wear-resistant strip covering the opening of the T-shaped slide, a slot is provided on the top of the displacement slider, and the two sides of the rubber wear-resistant strip are bent downward and respectively engaged in the slots of the adjacent displacement slider.

[0014] Each slot is equipped with a clamping spring sheet. One end of the clamping spring sheet is fixed to the side wall of the slot, and the other end elastically presses against the bent edge of the rubber wear-resistant belt. When the displacement slider moves relative to the belt, the rubber wear-resistant belt always remains taut.

[0015] Preferably, the preload adjustment mechanism includes an adjustment screw seat at the bottom of each displacement slider, an axially penetrating internal threaded hole in the adjustment screw seat, an adjustment screw screwed into the internal threaded hole, a reserved hole at the bottom of the T-shaped slide, and the lower end of the adjustment screw screw threadedly connected to the reserved hole. The displacement slider forms an adjustable locking connection with the central load-bearing beam through the adjustment screw seat, the adjustment screw screw, and the reserved hole.

[0016] Preferably, a horizontal leveling shim set is provided on the anchor plates of the left anchor base and the right anchor base. The horizontal leveling shim set is composed of multiple metal shims stacked together and is located between the positioning pin and the anchor plate.

[0017] Preferably, the displacement slider is equipped with a displacement sensor, with the sensing end of the displacement sensor facing the adjacent displacement slider, for real-time monitoring of the relative displacement between the two sliders; the displacement sensor is electrically connected to a central controller located inside the main beam body, and the central controller automatically adjusts the rotation direction and number of revolutions of the micro servo motor according to the displacement data, so that the displacement slider dynamically follows the deformation of the beam end.

[0018] Preferably, the upper surface of the rubber wear-resistant belt is provided with a wear-resistant coating, which is formed by spraying and curing polyurethane composite material; the lower surface of the rubber wear-resistant belt is provided with a temperature compensation layer, which is woven from shape memory alloy wire.

[0019] Preferably, the two end faces of the central load-bearing beam are provided with buffer energy-absorbing blocks, which are made of high-damping rubber material, and a preset gap is left between the buffer energy-absorbing blocks and the end faces of the beam.

[0020] The beneficial effects of this invention are as follows:

[0021] In this invention, the left and right anchoring bases form a dry connection system through pre-embedded anchoring plates, positioning pins, and high-strength pre-tightening bolts, eliminating the need for on-site concrete pouring or welding, significantly shortening the installation period and avoiding the impact of weather conditions on construction quality. The central load-bearing beam adopts an I-shaped main beam structure, and the displacement compensation slider group set in the T-shaped groove at its top is driven to move longitudinally by a micro servo motor. Combined with the elastic snap-fit ​​structure of the rubber wear-resistant strip, the tension adjustment component can adapt to the thermal expansion and contraction and load deformation of the beam end during normal bridge operation. The pre-tightening adjustment mechanism can adjust the pre-compression of the sealing strip without removing the device by adjusting the screw, extending the service life of the seal. When a displacement slider or rubber wear-resistant strip is partially damaged, it is only necessary to loosen the high-strength pre-tightening bolt in the corresponding area, pull the damaged module out of the T-shaped groove for replacement, and the rest can still maintain normal function, realizing a truly independent quick replacement of a single module. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0023] In the attached image:

[0024] Figure 1 This is a schematic diagram of a prefabricated telescopic device;

[0025] Figure 2 This is a schematic diagram of the left and right anchoring bases;

[0026] Figure 3 Schematic diagram of the central load-bearing beam;

[0027] Figure 4 This is a partial schematic diagram of the tension adjustment assembly;

[0028] Figure 5 This is a cross-sectional schematic diagram of a prefabricated telescopic device.

[0029] Figure 6 for Figure 5 Enlarged diagram of point A in the middle.

[0030] In the diagram: 1. Main load-bearing frame assembly; 11. Left anchoring base; 111. Anchoring plate; 112. Positioning pin; 113. Threaded blind hole; 114. Horizontal leveling shim set; 1141. Metal shim; 12. Right anchoring base; 13. Central load-bearing beam; 131. Main beam body; 1311. T-shaped slide; 1312. Guide rack; 1313. Reserved hole; 132. Positioning sleeve; 133. Through hole; 134. High-strength preload bolt; 2. Tension adjustment assembly; 21. Elastic wear-resistant component; 211. Rubber wear-resistant belt; 22. Displacement compensation slider set; 221. Displacement slider; 2211. Slot; 2212. Compression spring plate; 2213. Drive gear; 23. Preload adjustment mechanism; 231. Adjusting screw seat; 232. Internal threaded hole; 233. Adjusting screw. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0034] like Figures 1 to 6 As shown, the present invention provides an assembled expansion joint for the connection joint at the end of a bridge beam, including a main load-bearing frame assembly 1 and a tension adjustment assembly 2 detachably connected to the main load-bearing frame assembly 1.

[0035] The main load-bearing frame assembly 1 includes a left anchor base 11 and a right anchor base 12, as well as a central load-bearing beam 13 disposed on the left anchor base 11 and the right anchor base 12;

[0036] The tension adjustment assembly 2 includes an elastic wear-resistant component 21 disposed on the central support beam 13, and a displacement compensation slider group 22 located below the elastic wear-resistant component 21 and slidably connected to the central support beam 13. A pre-tightening adjustment mechanism 23 is provided on the displacement compensation slider group 22, and the displacement compensation slider group 22 forms an adjustable locking connection with the central support beam 13 through the pre-tightening adjustment mechanism 23.

[0037] Both the left anchoring base 11 and the right anchoring base 12 include an anchoring plate 111 pre-embedded at the end of the bridge beam and several positioning pins 112 vertically fixed on the anchoring plate 111, as well as several threaded blind holes 113 opened on the anchoring plate 111. The two ends of the central load-bearing beam 13 are respectively provided with positioning sleeves 132 that are inserted and matched with the positioning pins 112 and through holes 133 corresponding to the threaded blind holes 113. High-strength pre-tightening bolts 134 are inserted in the through holes 133. The left anchoring base 11 and the right anchoring base 12 are fixedly connected to the central load-bearing beam 13 through the high-strength pre-tightening bolts 134, the threaded blind holes 113 and the through holes 133.

[0038] Specifically, the anchor plate 111, as the part directly connected to the bridge beam end, is usually made of high-strength steel to ensure that it will not be damaged when subjected to the forces generated by the deformation of the bridge beam end over a long period of time. The way it is embedded in the bridge beam end allows the anchor plate 111 to be tightly integrated with the bridge beam body, forming a whole, which can effectively transfer the force to the bridge structure.

[0039] The positioning pin 112 is vertically fixed to the anchor plate 111, and its function is to provide precise positioning for the installation of the central load-bearing beam 13. The positioning pin 112 is generally cylindrical in shape and its surface is finely machined to ensure that it can fit tightly with the positioning sleeve 132 on the central load-bearing beam 13, reduce errors during the installation process, and ensure the accurate horizontal position of the central load-bearing beam 13.

[0040] The threaded blind hole 113 is formed on the anchor plate 111 to mate with the high-strength preload bolt 134 to fix the central load-bearing beam 13 to the left anchor base 11 and the right anchor base 12. The depth and diameter of the threaded blind hole 113 are designed according to the specifications of the high-strength preload bolt 134 to ensure the strength and reliability of the connection.

[0041] like Figures 3 to 6 As shown, in this embodiment, the central load-bearing beam 13 includes a main beam body 131, and a T-shaped groove 1311 is provided on the main beam body 131 along the longitudinal direction. A guide rack 1312 is provided on the side wall of the T-shaped groove 1311.

[0042] The displacement compensation slider group 22 includes at least two displacement sliders 221 that are slidably connected in T-shaped grooves 1311. At the bottom of the displacement slider 221, there is a drive gear 2213 that meshes with the guide rack 1312 and a micro servo motor that drives the drive gear 2213 to rotate. The displacement slider 221 moves longitudinally along the T-shaped groove 1311 through the drive gear 2213 and the guide rack 1312.

[0043] Specifically, the central load-bearing beam 13 has positioning sleeves 132 that engage with positioning pins 112 and through holes 133 corresponding to threaded blind holes 113 at both ends. High-strength preload bolts 134 are inserted into the through holes 133, and the left anchoring base 11 and the right anchoring base 12 are fixedly connected to the central load-bearing beam 13 through the high-strength preload bolts 134, the threaded blind holes 113 and the through holes 133.

[0044] In this embodiment, the main beam 131 is the main body of the central load-bearing beam 13, and is typically made of high-strength alloy steel, possessing sufficient strength and rigidity to withstand the tensile, compressive, and bending moments generated by the deformation of the bridge beam ends. A T-shaped groove 1311 is longitudinally formed on the main beam 131, and a guide rack 1312 is provided on the side wall of the T-shaped groove 1311. The design of the T-shaped groove 1311 provides a sliding track for the displacement compensation slider assembly 22, while the T-shaped structure restricts the movement of the displacement slider 221 in the direction perpendicular to the groove, ensuring the stability of the slider's movement. The guide rack 1312 provides a meshing surface for the drive gear 2213 on the displacement slider 221, enabling the displacement slider 221 to move longitudinally along the T-shaped groove 1311 under the drive of a micro servo motor.

[0045] The positioning sleeves 132 are located at both ends of the central load-bearing beam 13 and are inserted into the positioning pins 112 on the left anchor base 11 and the right anchor base 12. The inner diameter of the positioning sleeves 132 matches the outer diameter of the positioning pins 112. This insertion method allows the central load-bearing beam 13 to be quickly and accurately positioned on the left anchor base 11 and the right anchor base 12, facilitating subsequent fixing connections.

[0046] In this embodiment, through holes 133 are formed at both ends of the central load-bearing beam 13, corresponding to the threaded blind holes 113 on the anchor plate 111, for inserting high-strength preload bolts 134. The high-strength preload bolts 134 connect the central load-bearing beam 13 to the left anchor base 11 and the right anchor base 12 through threaded connections, forming a stable integral structure.

[0047] Specifically, the displacement compensation slider group 22 includes at least two displacement sliders 221 slidably connected in the T-shaped slide groove 1311. At the bottom of the displacement slider 221, there is a drive gear 2213 that meshes with the guide rack 1312 and a micro servo motor that drives the drive gear 2213 to rotate. The displacement slider 221 moves longitudinally along the T-shaped slide groove 1311 through the drive gear 2213 and the guide rack 1312.

[0048] In this embodiment, the displacement slider 221 is the core component of the displacement compensation slider assembly 22. Its shape is typically rectangular, adapted to the T-shaped groove 1311, and allows for smooth sliding within the groove. The number of displacement sliders 221 is determined based on the deformation requirements of the bridge beam end and the design requirements of the device, generally not less than two. Multiple displacement sliders 221 cooperate with each other to better adapt to the uneven deformation of the bridge beam end.

[0049] The drive gear 2213 is located at the bottom of the displacement slider 221 and meshes with the guide rack 1312 on the side wall of the T-shaped groove 1311. A micro servo motor is connected to the drive gear 2213, providing power for its rotation. When the micro servo motor operates, the drive gear 2213 rotates, and through its meshing with the guide rack 1312, drives the displacement slider 221 to move longitudinally along the T-shaped groove 1311. The micro servo motor features high precision and fast response, enabling it to adjust the position of the displacement slider 221 in real time according to the deformation of the bridge beam end, achieving precise displacement compensation.

[0050] like Figures 4 to 6 As shown, in this embodiment, the elastic wear-resistant component 21 includes a rubber wear-resistant strip 211 covering the opening of the T-shaped groove 1311, and a slot 2211 is provided on the top of the displacement slider 221. The two sides of the rubber wear-resistant strip 211 are bent downward and respectively engaged in the slots 2211 of the adjacent displacement slider 221.

[0051] A clamping spring sheet 2212 is provided in each slot 2211. One end of the clamping spring sheet 2212 is fixed to the side wall of the slot 2211, and the other end elastically presses against the bent edge of the rubber wear-resistant belt 211. When the displacement slider 221 moves relative to it, the rubber wear-resistant belt 211 always remains taut.

[0052] Specifically, the elastic wear-resistant component 21 includes a rubber wear-resistant strip 211 covering the opening of the T-shaped slide 1311. A slot 2211 is provided on the top of the displacement slider 221. The two sides of the rubber wear-resistant strip 211 are bent downward and respectively engaged in the slots 2211 of the adjacent displacement sliders 221. A compression spring 2212 is provided in each slot 2211. One end of the compression spring 2212 is fixed to the side wall of the slot 2211, and the other end elastically presses against the bent edge of the rubber wear-resistant strip 211. When the displacement sliders 221 move relative to each other, the rubber wear-resistant strip 211 always remains taut.

[0053] Specifically, the rubber wear-resistant belt 211 is made of high-strength, wear-resistant rubber material and covers the opening of the T-shaped groove 1311, protecting the internal structure of the T-shaped groove 1311, preventing the entry of debris, and reducing friction and wear. The upper surface of the rubber wear-resistant belt 211 is coated with a wear-resistant coating, which is formed by spraying and curing polyurethane composite material. Polyurethane composite material has excellent wear resistance and corrosion resistance, further improving the service life of the rubber wear-resistant belt 211. The lower surface of the rubber wear-resistant belt 211 is provided with a temperature compensation layer, which is woven from shape memory alloy wires. When changes in ambient temperature cause the rubber to shrink or expand, the shape memory alloy wires generate reverse stress through phase transformation, suppressing dimensional changes in the rubber wear-resistant belt 211 and ensuring that the rubber wear-resistant belt 211 maintains stable performance under different temperature environments.

[0054] In this embodiment, the slot 2211 is located on the top of the displacement slider 221 and is used to engage the two side edges of the rubber wear-resistant belt 211. A clamping spring 2212 is installed in the slot 2211, with one end fixed to the side wall of the slot 2211 and the other end elastically pressing against the bent edge of the rubber wear-resistant belt 211. The function of the clamping spring 2212 is to keep the rubber wear-resistant belt 211 taut at all times, preventing it from loosening or falling off during the movement of the displacement slider 221, thus ensuring the normal operation of the device.

[0055] like Figures 4 to 6 As shown, in this embodiment, the pre-tightening adjustment mechanism 23 includes an adjusting screw seat 231 disposed at the bottom of each displacement slider 221. An axially penetrating internal threaded hole 232 is provided in the adjusting screw seat 231, and an adjusting screw 233 is screwed into the internal threaded hole 232. Several reserved holes 1313 are provided at the bottom of the T-shaped slide groove 1311. The lower end of the adjusting screw 233 is threadedly connected to one of the several reserved holes 1313. The displacement slider 221 forms an adjustable locking connection with the central load-bearing beam 13 through the adjusting screw seat 231, the adjusting screw 233 and the several reserved holes 1313.

[0056] Specifically, the pre-tightening adjustment mechanism 23 includes an adjusting screw seat 231 provided at the bottom of each displacement slider 221. An axially penetrating internal threaded hole 232 is provided in the adjusting screw seat 231. An adjusting screw 233 is screwed into the internal threaded hole 232. A reserved hole 1313 is provided at the bottom of the T-shaped slide groove 1311. The lower end of the adjusting screw 233 is threaded to the reserved hole 1313. The displacement slider 221 forms an adjustable locking connection with the central load-bearing beam 13 through the adjusting screw seat 231, the adjusting screw 233 and the reserved hole 1313.

[0057] In this embodiment, the adjusting screw seat 231 is fixed to the bottom of the displacement slider 221, providing mounting support for the adjusting screw 233. The adjusting screw seat 231 is provided with an axially penetrating internal threaded hole 232, the specifications of which match the adjusting screw 233, ensuring that the adjusting screw 233 can be smoothly screwed in and out.

[0058] The adjusting screw 233 is screwed into the internal threaded hole 232 of the adjusting screw seat 231, and its lower end is threaded to the reserved hole 1313 at the bottom of the T-shaped slide groove 1311. By rotating the adjusting screw 233, the relative position between the displacement slider 221 and the central support beam 13 can be changed, thereby adjusting the preload of the device. When the preload needs to be increased, the adjusting screw 233 is rotated clockwise; when the preload needs to be decreased, the adjusting screw 233 is rotated counterclockwise.

[0059] The reserved hole 1313 is located at the bottom of the T-shaped slide groove 1311 and is threaded to the lower end of the adjusting screw 233. The position and depth of the reserved hole 1313 are determined according to the specifications of the adjusting screw 233 and the design requirements of the device to ensure that the adjusting screw 233 can be firmly connected and to guarantee the stability of the pre-tightening adjustment mechanism 23.

[0060] like Figure 2 and Figure 5 As shown, in this embodiment, a horizontal leveling shim assembly 114 is provided on the anchor plates 111 of the left anchor base 11 and the right anchor base 12. The horizontal leveling shim assembly 114 is composed of multiple metal shims 1141 stacked together and is located between the positioning pin 112 and the anchor plate 111. The function of the horizontal leveling shim assembly 114 is to adjust the levelness of the central load-bearing beam 13 during installation, ensuring that the central load-bearing beam 13 is in a stable state in the horizontal direction. The number of metal shims 1141 can be increased or decreased according to actual needs. By adjusting the number and thickness of the shims, the horizontal position of the central load-bearing beam 13 can be precisely adjusted, ensuring the installation quality of the device.

[0061] In this embodiment, the displacement slider 221 is equipped with a displacement sensor, with the sensing end of the displacement sensor facing the adjacent displacement slider 221, for real-time monitoring of the relative displacement between the two sliders; the displacement sensor is electrically connected to a central controller installed inside the main beam 131, and the central controller automatically adjusts the rotation direction and number of revolutions of the micro servo motor according to the displacement data, so that the displacement slider 221 dynamically follows the deformation of the beam end.

[0062] Specifically, the displacement sensor employs a high-precision linear displacement sensor, capable of accurately measuring the relative displacement between adjacent displacement sliders 221. The displacement sensor converts the measured displacement signal into an electrical signal and transmits it to the central controller via an electrical connection.

[0063] The central controller is the core of the intelligent control of the entire device, and it typically uses a microprocessor or a programmable logic controller (PLC). The central controller receives displacement signals from the displacement sensors, processes and analyzes the data, and automatically adjusts the rotation direction and number of revolutions of the micro servo motor according to a preset control algorithm, so that the displacement slider 221 can follow the deformation of the bridge beam end in real time and accurately, realizing the automatic adjustment and intelligent control of the device.

[0064] In this embodiment (not shown in the figure), buffer energy-absorbing blocks are provided on both ends of the central load-bearing beam. The buffer energy-absorbing blocks are made of high-damping rubber material, and a preset gap is left between the buffer energy-absorbing blocks and the beam end face.

[0065] Specifically, when the bridge beam end undergoes significant deformation or is subjected to impact, the buffer energy-absorbing block can absorb some of the energy through its own elastic deformation, reducing the impact and damage to the central load-bearing beam and other components, thus acting as a protective device. The preset gap is designed to ensure that the buffer energy-absorbing block is not compressed under normal working conditions, and only functions when subjected to significant external forces.

[0066] The present invention provides an assembled expansion joint for bridge beam end connection joints, the working principle of which is as follows:

[0067] The left anchoring base 11 and the right anchoring base 12 are fixed to the beam body through the pre-embedded anchoring plate 111. The central load-bearing beam 13 is initially positioned by the positioning pin 112 and the positioning sleeve 132, and finally locked by the high-strength pre-tightening bolt 134 to form a dry connection. The displacement compensation slider group 22 moves along the T-shaped slide groove 1311 under the drive of the micro servo motor, driving the rubber wear-resistant belt 211 to extend and retract synchronously to adapt to the deformation of the beam end. The pre-tightening adjustment mechanism 23 can independently adjust the top pressure of each displacement slider 221 on the rubber wear-resistant belt 211. When a local part is damaged, it is only necessary to loosen the high-strength pre-tightening bolt 134 in the corresponding area to pull out the damaged displacement slider 221 or the rubber wear-resistant belt 211 from the T-shaped slide groove 1311 for replacement.

[0068] This invention has many applications, including but not limited to the following described scenarios:

[0069] Installing this prefabricated expansion joint at the beam-end connection joints of newly constructed bridges offers advantages such as convenient and efficient installation, and the dry connection system is not limited by weather conditions, thus accelerating construction progress, ensuring construction quality, and enabling the bridge to be put into use as soon as possible. Simultaneously, its adaptive deformation capacity and intelligent monitoring and adjustment functions can meet the deformation requirements of newly constructed bridges under different operational stages due to temperature changes and load effects, ensuring the long-term safe operation of the bridge.

[0070] For older bridges requiring renovation, the existing expansion joint devices may be aging or damaged, necessitating replacement. The modular, quick-change design of this prefabricated expansion joint device allows for easy replacement of damaged modules during renovation, minimizing disruption to normal bridge operation. Furthermore, its optimized performance and intelligent design enhance the overall performance of the existing bridge's expansion joint system, extending its service life and improving the safety and comfort of the bridge.

[0071] In regions with harsh climates, such as frigid or hot areas, bridge expansion joint devices need to withstand significant temperature variations. The temperature compensation layer design of the rubber wear-resistant belt in this device effectively suppresses dimensional changes in the rubber caused by temperature variations, ensuring the device's normal operation under different temperature conditions. Therefore, it is suitable for bridges in these special climatic regions.

[0072] For bridges with heavy traffic, maintenance work needs to minimize the impact on traffic. The modular expansion joint's independent quick-change and intelligent monitoring and adjustment functions enable rapid repair and replacement in the event of localized damage without prolonged traffic interruption. Simultaneously, the intelligent adjustment function can adapt to bridge deformation in a timely manner, ensuring the bridge's operational safety. Therefore, it is ideally suited for use on bridges with heavy traffic.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prefabricated expansion joint for use at the end joint of a bridge beam, characterized in that, include: The main load-bearing frame assembly and the tension adjustment assembly detachably connected to the main load-bearing frame assembly; The main load-bearing frame assembly includes a left anchor base and a right anchor base, as well as a central load-bearing beam disposed on the left anchor base and the right anchor base; The tension adjustment assembly includes an elastic wear-resistant component set on the central load-bearing beam, and a displacement compensation slider group located below the elastic wear-resistant component and slidably connected to the central load-bearing beam. A pre-tightening adjustment mechanism is provided on the displacement compensation slider group, and the displacement compensation slider group forms an adjustable locking connection with the central load-bearing beam through the pre-tightening adjustment mechanism. Both the left and right anchoring bases include anchoring plates pre-embedded in the ends of the bridge beams and several positioning pins vertically fixed on the anchoring plates, as well as several threaded blind holes opened on the anchoring plates. The two ends of the central load-bearing beam are respectively provided with positioning sleeves that are inserted and matched with the positioning pins and through holes corresponding to the threaded blind holes. High-strength preloaded bolts are inserted in the through holes. The left and right anchoring bases are fixedly connected to the central load-bearing beam through high-strength preloaded bolts, threaded blind holes and through holes. The central load-bearing beam includes a main beam body, on which a T-shaped groove is formed along the longitudinal direction, and a guide rack is provided on the side wall of the T-shaped groove. The displacement compensation slider assembly includes at least two displacement sliders that are slidably connected in a T-shaped groove. At the bottom of the displacement slider, there is a drive gear that meshes with a guide rack and a miniature servo motor that drives the drive gear to rotate. The displacement slider moves longitudinally along the T-shaped groove through the drive gear and the guide rack. The displacement slider is equipped with a displacement sensor, with the sensing end of the displacement sensor facing the adjacent displacement slider, for real-time monitoring of the relative displacement between the two sliders. The displacement sensor is electrically connected to a central controller located inside the main beam body. The central controller automatically adjusts the rotation direction and number of revolutions of the micro servo motor according to the displacement data, so that the displacement slider dynamically follows the deformation of the beam end.

2. The prefabricated expansion joint device for bridge beam end connection joints according to claim 1, characterized in that, The elastic wear-resistant component includes a rubber wear-resistant strip covering the opening of the T-shaped slide, a slot is provided on the top of the displacement slider, and the two sides of the rubber wear-resistant strip are bent downward and respectively engaged in the slots of the adjacent displacement slider. Each slot is equipped with a pressure spring sheet. One end of the pressure spring sheet is fixed to the side wall of the slot, and the other end elastically presses against the bent edge of the rubber wear-resistant belt. When the displacement slider moves relative to the belt, the rubber wear-resistant belt always remains taut.

3. The prefabricated expansion joint device for bridge beam end connection joints according to claim 1, characterized in that, The preload adjustment mechanism includes an adjusting screw seat at the bottom of each displacement slider, an axially penetrating internal threaded hole in the adjusting screw seat, an adjusting screw screwed into the internal threaded hole, and several reserved holes at the bottom of the T-shaped slide groove. The lower end of the adjusting screw screw is threaded to one of the reserved holes. The displacement slider forms an adjustable locking connection with the central load-bearing beam through the adjusting screw seat, the adjusting screw screw, and the reserved holes.

4. A prefabricated expansion joint for bridge beam end connection joints according to claim 1, characterized in that, A horizontal leveling shim set is provided on the anchor plates of the left and right anchor bases. The horizontal leveling shim set is composed of multiple metal shims stacked together and is located between the positioning pin and the anchor plate.

5. A prefabricated expansion joint for bridge beam end connection joints according to claim 2, characterized in that, The upper surface of the rubber wear-resistant belt is provided with a wear-resistant coating, which is formed by spraying and curing polyurethane composite material; the lower surface of the rubber wear-resistant belt is provided with a temperature compensation layer, which is woven from shape memory alloy wire.

6. A prefabricated expansion joint for bridge beam end connection joints according to claim 1, characterized in that, The two ends of the central load-bearing beam are equipped with buffer energy-absorbing blocks made of high-damping rubber material, and a preset gap is left between the buffer energy-absorbing blocks and the beam end face.

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