A reinforcement device and method for cantilever bridges

Abstract

This invention belongs to the field of bridge reinforcement technology, specifically referring to a cantilever bridge reinforcement device and method, including a hinged seat, an overload sensing component, a lateral balancing component, a tensioning component, a buffer unloading component, a support and reinforcement component, an installation component, and a cantilever bridge. The hinged seat is mounted on the installation component, the installation component is mounted on the cantilever bridge, and the overload sensing component is located between the hinged seats. This invention uses the relative extension and retraction of the sensing cavity and the sensing piston rod to feedback changes in the compression amplitude of the unloading spring, and automatically adjusts the tension of the steel cable through the lateral balancing component. Because the lateral force exerted on the pier mounting frame by the steel cable and the buffer unloading component is simultaneously reduced, the lateral thrust on the pier body can be maintained within a certain range, thereby preventing damage to the pier body due to excessive lateral thrust.

Description

Technical Field

[0001] This invention belongs to the field of bridge reinforcement technology, specifically referring to a cantilever bridge reinforcement device and method. Background Technology

[0002] Many steel cantilever bridges suffer from problems such as sagging at the cantilever after long-term use, posing safety hazards. Some small bridges with low strength can still have their service life extended by several years or even decades after reinforcement. Considering factors such as spatial layout, cost, and effectiveness, adding diagonal bracing between the piers and the bridge deck is the most widely used solution.

[0003] This reinforcement scheme still has some problems: the diagonal bracing is located between the pier and the bridge deck, and it provides not only longitudinal support but also lateral thrust to both. The bridge deck can withstand the lateral force, but the pier often cannot. This is because the pier is designed to mainly bear longitudinal pressure. Therefore, the amount of support force that the diagonal bracing can provide is limited by the strength of the pier itself, making it difficult to achieve a good support effect. Summary of the Invention

[0004] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a cantilever bridge reinforcement device and method. This solution adds an overload sensing component, a lateral balancing component, and a tensioning component to the existing diagonal bracing. The relative extension and retraction of the sensing cavity and the sensing piston rod can provide feedback on changes in the compression amplitude of the stress-relieving spring, and the lateral balancing component automatically adjusts the tension of the steel cable. Because the lateral force exerted on the pier mounting frame by the steel cable and the stress-relieving component is simultaneously reduced, the lateral thrust on the pier body can be maintained within a certain range, thereby preventing damage to the pier body due to excessive lateral thrust.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a cantilever bridge reinforcement device, including a hinged seat, an overload sensing component, a lateral balancing component, a tensioning component, a buffer unloading component, a support and reinforcement component, an installation component, and a cantilever bridge. The hinged seat is disposed on the installation component, the installation component is disposed on the cantilever bridge, the overload sensing component is disposed between the hinged seats, the buffer unloading component and the support and reinforcement component are disposed between the hinged seats, and the buffer unloading component is disposed between the tensioning component and the installation component.

[0006] Furthermore, the overload sensing assembly includes an upper support tube, a lower support tube, a sensing cavity, and a sensing piston rod. The upper support tube and the lower support tube are respectively mounted on two hinged seats. The sensing cavity is mounted on the lower support tube, and the sensing piston rod is mounted on the upper support tube. The sensing piston rod is engaged and slidably mounted in the sensing cavity.

[0007] The relative extension and retraction of the sensing cavity and the sensing piston rod can provide feedback on the compression amplitude of the unloading spring, and the tension of the steel cable can be automatically adjusted by the lateral balancing component.

[0008] Furthermore, the lateral balancing assembly includes a balancing cavity, a balancing piston rod, and a hydraulic pipe. The balancing piston rod is engaged and slidably disposed in the balancing cavity, and the hydraulic pipe is disposed between the sensing cavity and the balancing cavity. When the sensing piston rod retracts into the sensing cavity, the balancing piston rod also retracts into the balancing cavity.

[0009] The steel cables and the buffer unloading components simultaneously reduce the lateral force on the pier mounting frame, ensuring that the lateral thrust on the pier body remains within a certain range, thus preventing damage to the pier body due to excessive lateral thrust.

[0010] Furthermore, the tensioning assembly includes a tensioning joint and a steel cable, the balance piston rod is located on one side of the tensioning joint, the steel cable is located on the other side of the tensioning joint, and the end of the steel cable is located on the mounting assembly.

[0011] Furthermore, the cantilever bridge includes a bridge deck and pier bodies, with the pier bodies arranged in an array at the bottom of the bridge deck.

[0012] Furthermore, the installation assembly includes a bottom support plate, a pier mounting frame, and a connecting pin. The bottom support plate is located below the bridge deck, the pier mounting frame is mounted on the pier body, and the end of the steel cable is located on the pier mounting frame.

[0013] Preferably, one of the hinge seats is hinged to the bottom support plate via a connecting pin, and the other hinge seat is hinged to the pier mounting frame via a connecting pin.

[0014] Furthermore, the buffer unloading assembly includes a sliding sleeve, a sliding guide rod, and an unloading spring. The sliding sleeve is mounted on a hinged seat, and the sliding guide rod is engaged and slidably mounted in the sliding sleeve. The sliding guide rod has a flange portion, and the unloading spring is located between the flange portion and the sliding sleeve.

[0015] By pre-compressing the unloading springs, continuous support force can be provided to the bridge deck, thereby compensating for the reduction in strength caused by long-term use and material fatigue.

[0016] Furthermore, the support and reinforcement assembly includes an adjusting sleeve and an adjusting screw. The adjusting sleeve is mounted on the hinge seat, and the adjusting screw is coaxial with and fixed to the sliding guide rod. The adjusting sleeve has an internal thread, and the adjusting screw has an external thread. The internal thread and the external thread are threaded together.

[0017] By rotating the adjusting screw, the total length of the buffer unloading component and the support reinforcement component can be actively adjusted to adapt to different installation positions, and the support force can be gradually increased after the no-load is completed.

[0018] This solution also proposes a method for using a cantilever bridge reinforcement device, which mainly includes the following steps:

[0019] Step 1: Install the pier mounting frame on the pier body, install the bottom support plate under the bridge deck, and then slowly extend the adjusting screw from the adjusting sleeve by rotating the adjusting screw. During this process, the unloading spring will be gradually compressed, and the position of the bottom support plate will be gradually lifted.

[0020] Step 2: Then, supply liquid into the sensing chamber and the balancing chamber until the steel cable is just taut. Then, remove the liquid injection device and connect the hydraulic pipeline between the sensing chamber and the balancing chamber.

[0021] Step 3: During use, when the bridge deck is unloaded or under light load, the support provided by the buffer unloading components and the support and reinforcement components, as well as the original structure of the bridge itself, is sufficient to ensure sufficient strength. However, when the bridge experiences a heavy load, the deformation of the bridge itself will push the unloading spring to compress. At the same time, as the sensing piston rod retracts towards the sensing cavity, some of the liquid in the sensing cavity will enter the balance cavity through the hydraulic pipe, causing the balance piston rod to retract towards the balance cavity.

[0022] Step 4: At this point, the steel cable is kept taut, applying a lateral tension to the pier mounting frame. This lateral tension is opposite in direction to the lateral thrust of the support and reinforcement components on the pier body. The two cancel each other out on the pier mounting frame, which can prevent the pier body from being damaged due to excessive lateral force.

[0023] Step 5: After the heavy load has passed, the buffer unloading component springs back to its original position, and the overload sensing component and the lateral balance component also spring back to their original position. The lateral force exerted on the pier mounting frame by the steel cable and the buffer unloading component is reduced at the same time, which can keep the lateral thrust on the pier body within a certain range.

[0024] The beneficial effects achieved by the present invention using the above structure are as follows:

[0025] (1) The relative extension and retraction of the sensing cavity and the sensing piston rod can provide feedback on the compression amplitude of the unloading spring, and the tension of the steel cable can be automatically adjusted by the lateral balance component.

[0026] (2) The lateral force on the pier mounting frame is reduced by the steel cable and the buffer unloading component, which can keep the lateral thrust on the pier body within a certain range; thus avoiding damage to the pier body due to excessive lateral thrust.

[0027] (3) By pre-compressing the unloading spring, a continuous supporting force can be provided to the bridge deck, thereby compensating for the strength reduction of the bridge deck due to long-term use and material fatigue.

[0028] (4) By rotating the adjusting screw, the total length of the buffer unloading component and the support reinforcement component can be actively adjusted to adapt to different installation positions, and the support force can be gradually increased after the no-load is completed. Attached Figure Description

[0029] Figure 1 This is a perspective view of a cantilever bridge reinforcement device proposed in this invention;

[0030] Figure 2 This is a front view of a cantilever bridge reinforcement device proposed in this invention;

[0031] Figure 3 This is a left view of a cantilever bridge reinforcement device proposed in this invention;

[0032] Figure 4 for Figure 2 A cross-sectional view along section line AA;

[0033] Figure 5 for Figure 3 A cross-sectional view along the cutting line BB;

[0034] Figure 6 for Figure 4 A magnified view of a section at point I;

[0035] Figure 7 for Figure 5 Enlarged view of a section at point II;

[0036] Figure 8 for Figure 5 Enlarged view of a section at point III;

[0037] Figure 9 for Figure 5 A magnified view of a section at point IV.

[0038] Among them, 1. Hinge seat, 2. Overload sensing component, 3. Lateral balance component, 4. Tensioning component, 5. Buffer and stress relief component, 6. Support and reinforcement component, 7. Installation component, 8. Cantilever bridge, 21. Upper support pipe, 22. Lower support pipe, 23. Sensing cavity, 24. Sensing piston rod, 31. Balance cavity, 32. Balance piston rod, 33. Hydraulic pipeline, 41. Tensioning joint, 42. Steel cable, 51. Sliding sleeve, 52. Sliding guide rod, 53. Stress relief spring, 61. Adjusting sleeve, 62. Adjusting screw, 71. Bottom support plate, 72. Pier mounting frame, 73. Connecting pin, 81. Bridge deck, 82. Pier body, 521. Flange, 611. Internal thread, 621. External thread.

[0039] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] like Figures 1-9 As shown, the present invention proposes a cantilever bridge reinforcement device, including a hinged seat 1, an overload sensing component 2, a lateral balancing component 3, a tensioning component 4, a buffer unloading component 5, a support and reinforcement component 6, an installation component 7, and a cantilever bridge 8. The hinged seat 1 is disposed on the installation component 7, the installation component 7 is disposed on the cantilever bridge 8, the overload sensing component 2 is disposed between the hinged seats 1, the buffer unloading component 5 and the support and reinforcement component 6 are disposed between the hinged seats 1, and the buffer unloading component 5 is disposed between the tensioning component 4 and the installation component 7.

[0043] The overload sensing assembly 2 includes an upper support tube 21, a lower support tube 22, a sensing cavity 23, and a sensing piston rod 24. The upper support tube 21 and the lower support tube 22 are respectively mounted on two hinge seats 1. The sensing cavity 23 is mounted on the lower support tube 22, and the sensing piston rod 24 is mounted on the upper support tube 21. The sensing piston rod 24 is engaged and slidably mounted in the sensing cavity 23.

[0044] The relative extension and retraction of the sensing cavity 23 and the sensing piston rod 24 can provide feedback on the compression amplitude of the unloading spring 53, and the tension of the steel cable 42 can be automatically adjusted by the lateral balance component 3.

[0045] The lateral balancing assembly 3 includes a balancing cavity 31, a balancing piston rod 32, and a hydraulic pipe 33. The balancing piston rod 32 is engaged and slidably disposed in the balancing cavity 31. The hydraulic pipe 33 is disposed between the sensing cavity 23 and the balancing cavity 31. When the sensing piston rod 24 retracts into the sensing cavity 23, the balancing piston rod 32 also retracts into the balancing cavity 31.

[0046] The steel cable 42 and the buffer unloading component 5 simultaneously reduce the lateral force on the pier mounting frame 72, which can keep the lateral thrust on the pier body 82 within a certain range; thus avoiding damage to the pier body 82 due to excessive lateral thrust.

[0047] The tensioning assembly 4 includes a tensioning joint 41 and a steel cable 42. The balance piston rod 32 is located on one side of the tensioning joint 41, and the steel cable 42 is located on the other side of the tensioning joint 41. The end of the steel cable 42 is located on the mounting assembly 7.

[0048] The cantilever bridge 8 includes a bridge deck 81 and pier bodies 82, with the pier bodies 82 arranged in an array at the bottom of the bridge deck 81.

[0049] The mounting assembly 7 includes a bottom support plate 71, a pier mounting frame 72, and a connecting pin 73. The bottom support plate 71 is located below the bridge deck 81, the pier mounting frame 72 is located on the pier body 82, and the end of the steel cable 42 is located on the pier mounting frame 72.

[0050] One of the hinged seats 1 is hinged to the bottom support plate 71 via a connecting pin 73, and the other hinged seat 1 is hinged to the pier mounting frame 72 via a connecting pin 73.

[0051] The buffer unloading assembly 5 includes a sliding sleeve 51, a sliding guide rod 52, and an unloading spring 53. The sliding sleeve 51 is mounted on the hinge seat 1, and the sliding guide rod 52 is engaged and slidably mounted in the sliding sleeve 51. The sliding guide rod 52 is provided with a flange 521, and the unloading spring 53 is located between the flange 521 and the sliding sleeve 51.

[0052] By pre-compressing the unloading spring 53, a continuous supporting force can be provided to the bridge deck 81, thereby compensating for the reduction in strength of the bridge deck 81 due to long-term use and material fatigue.

[0053] The support and reinforcement component 6 includes an adjusting sleeve 61 and an adjusting screw 62. The adjusting sleeve 61 is mounted on the hinge seat 1. The adjusting screw 62 is coaxial with and fixed to the sliding guide rod 52. The adjusting sleeve 61 is provided with an internal thread 611, and the adjusting screw 62 is provided with an external thread 621. The internal thread 611 and the external thread 621 are threaded together.

[0054] By rotating the adjusting screw 62, the total length of the buffer unloading component 5 and the support reinforcement component 6 can be actively adjusted to adapt to different installation positions, and the support force can be gradually increased after the no-load is completed.

[0055] In practical use, the user first needs to install the pier mounting bracket 72 on the pier body 82 and install the bottom support plate 71 under the bridge deck 81. The installation method can be common methods such as welding or bolt connection. Then, by rotating the adjusting screw 62, the adjusting screw 62 is slowly extended from the adjusting sleeve 61. During this process, the unloading spring 53 will be gradually compressed, and the position of the bottom support plate 71 will be gradually lifted until the supporting strength of the bottom support plate 71 on the bridge deck 81 is sufficient to maintain the normal use of the bridge deck 81.

[0056] Then, liquid is supplied to the sensing chamber 23 and the balancing chamber 31 until the steel cable 42 is just taut. Then, the liquid injection device is removed and the hydraulic pipe 33 is connected between the sensing chamber 23 and the balancing chamber 31.

[0057] During use, when the bridge deck 81 is unloaded or under light load, the support of the bridge deck 81 by the buffer unloading component 5 and the support and reinforcement component 6, as well as the original structure of the bridge itself, is sufficient to ensure sufficient strength.

[0058] When the bridge is subjected to a large load, due to the nature of the steel structure itself, the bridge itself can undergo a small deformation, which will push the unloading spring 53 to compress. At the same time, as the sensing piston rod 24 retracts toward the sensing cavity 23, some of the liquid in the sensing cavity 23 will enter the balance cavity 31 through the hydraulic pipe 33, causing the balance piston rod 32 to retract toward the balance cavity 31.

[0059] At this time, the steel cable 42 is continued to be tensioned, applying a lateral tension to the pier mounting frame 72. This lateral tension is opposite in direction to the lateral thrust of the support and reinforcement component 6 on the pier body 82. The two cancel each other out on the pier mounting frame 72, which can avoid the problem of damage caused by excessive lateral force on the pier body 82.

[0060] After the brief period of heavy load has passed, the buffer unloading component 5 rebounds and resets, and the overload sensing component 2 and the lateral balance component 3 also rebound and reset. The lateral force of the steel cable 42 and the buffer unloading component 5 on the pier mounting frame 72 is reduced at the same time, which can keep the lateral thrust on the pier body 82 within a certain range.

[0061] Another embodiment of this scheme: If the buffer unloading component 5 and the support reinforcement component 6 provide a large support force in the initial state, the steel cable 42 can have a certain tension in the initial state, thereby avoiding excessive lateral thrust on the pier body 82.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A reinforcement device for cantilever bridges, characterized in that: The system includes a hinged seat (1), an overload sensing component (2), a lateral balancing component (3), a tensioning component (4), a buffer unloading component (5), a support and reinforcement component (6), an installation component (7), and a cantilever bridge (8). The hinged seat (1) is mounted on the installation component (7), the installation component (7) is mounted on the cantilever bridge (8), the overload sensing component (2) is located between the hinged seats (1), the buffer unloading component (5) and the support and reinforcement component (6) are located between the hinged seats (1), and the buffer unloading component (5) is located between the tensioning component (4) and the installation component (7). The overload sensing assembly (2) includes an upper support tube (21), a lower support tube (22), a sensing cavity (23), and a sensing piston rod (24). The upper support tube (21) and the lower support tube (22) are respectively mounted on two hinge seats (1). The sensing cavity (23) is mounted on the lower support tube (22). The sensing piston rod (24) is mounted on the upper support tube (21). The sensing piston rod (24) is engaged and slidably mounted in the sensing cavity (23). The lateral balancing assembly (3) includes a balancing cavity (31), a balancing piston rod (32), and a hydraulic pipe (33). The balancing piston rod (32) is engaged and slidably disposed in the balancing cavity (31). The hydraulic pipe (33) is disposed between the sensing cavity (23) and the balancing cavity (31). When the sensing piston rod (24) retracts into the sensing cavity (23), the balancing piston rod (32) also retracts into the balancing cavity (31). The tensioning assembly (4) includes a tensioning joint (41) and a steel cable (42). The balance piston rod (32) is located on one side of the tensioning joint (41), and the steel cable (42) is located on the other side of the tensioning joint (41). The cantilever bridge (8) includes a bridge deck (81) and a pier body (82). The installation assembly (7) includes a bottom support plate (71), a pier mounting frame (72), and a connecting pin (73). The bottom support plate (71) is located below the bridge deck (81), the pier mounting frame (72) is located on the pier body (82), and the end of the steel cable (42) is located on the pier mounting frame (72). One of the hinge seats (1) is hinged to the bottom support plate (71) through the connecting pin (73), and the other hinge seat (1) is hinged to the pier mounting frame (72) through the connecting pin (73).

2. The cantilever bridge reinforcement device according to claim 1, characterized in that: The pier body (82) is arrayed at the bottom of the bridge deck (81).

3. The cantilever bridge reinforcement device according to claim 1, characterized in that: The buffer unloading assembly (5) includes a sliding sleeve (51), a sliding guide rod (52), and an unloading spring (53). The sliding sleeve (51) is mounted on the hinge seat (1), and the sliding guide rod (52) is engaged and slidably mounted in the sliding sleeve (51). The sliding guide rod (52) is provided with a flange (521), and the unloading spring (53) is located between the flange (521) and the sliding sleeve (51).

4. The cantilever bridge reinforcement device according to claim 3, characterized in that: The support and reinforcement component (6) includes an adjusting sleeve (61) and an adjusting screw (62). The adjusting sleeve (61) is mounted on the hinge seat (1). The adjusting screw (62) is coaxial with and fixed to the sliding guide rod (52). The adjusting sleeve (61) has an internal thread (611), and the adjusting screw (62) has an external thread (621). The internal thread (611) and the external thread (621) are threaded together.

5. The method of using the cantilever bridge reinforcement device according to claim 4, characterized in that, Includes the following steps: Step 1: Install the pier mounting bracket (72) on the pier body (82), install the bottom support plate (71) under the bridge deck (81), and then slowly extend the adjusting screw (62) from the adjusting sleeve (61) by rotating the adjusting screw (62). During this process, the unloading spring (53) will be gradually compressed, and the position of the bottom support plate (71) will be gradually lifted. Step 2: Then, liquid is supplied into the sensing chamber (23) and the balancing chamber (31) until the steel cable (42) is just taut. Then, the liquid injection device is removed and the hydraulic pipe (33) is connected between the sensing chamber (23) and the balancing chamber (31). Step 3: During use, when the bridge deck (81) is unloaded or under light load, the support of the bridge deck (81) by the buffer unloading component (5) and the support reinforcement component (6), as well as the original structure of the bridge itself, is sufficient to ensure sufficient strength; when the bridge experiences a large load, the deformation of the bridge itself will push the unloading spring (53) to compress, and at the same time, as the sensing piston rod (24) retracts toward the sensing cavity (23), some of the liquid in the sensing cavity (23) will enter the balance cavity (31) through the hydraulic pipe (33), causing the balance piston rod (32) to retract toward the balance cavity (31); Step 4: At this time, the steel cable (42) is continued to be tensioned, and a lateral tension is applied to the pier mounting frame (72). This lateral tension is opposite to the lateral thrust of the support and reinforcement component (6) on the pier body (82). The two cancel each other out on the pier mounting frame (72), which can avoid the problem of the pier body (82) being damaged due to excessive lateral force. Step 5: After the heavy load passes, the buffer unloading component (5) springs back to its original position, and the overload sensing component (2) and the lateral balance component (3) also spring back to their original positions. The lateral force of the steel cable (42) and the buffer unloading component (5) on the pier mounting frame (72) decreases simultaneously.

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