Suspender bridge anchoring system tie rod replacement tool and method

Abstract

The application belongs to the technical field of suspension bridge maintenance, and discloses a suspension bridge anchoring system pull rod replacement tool and method. The suspension bridge anchoring system pull rod replacement tool can complete the replacement of the corroded pull rod and the pull rod nut in the suspension bridge anchoring system without relying on the pre-embedded additional anchoring component, thereby saving high pre-embedded construction cost. The suspension bridge anchoring system pull rod replacement tool can complete the replacement of the corroded pull rod and the pull rod nut without releasing the main cable single wire strand tension and without damaging the pre-embedded component of the anchoring system, thereby avoiding the instability of the suspension bridge anchoring system caused by the unilateral pull rod failure. Moreover, the tool has strong universality and high overall operation convenience. Compared with the prior art, the suspension bridge anchoring system pull rod replacement method significantly reduces the early investment and construction period, is clear in operation steps, controllable in risks, and suitable for the replacement of corroded pull rods of various suspension bridges.

Description

Technical Field

[0001] This invention relates to the field of suspension bridge maintenance technology, and in particular to a tool and method for replacing tie rods in the anchorage system of a suspension bridge. Background Technology

[0002] The main cable of a suspension bridge is anchored in the concrete anchorage via a multi-strength galvanized aluminum alloy steel wire anchored to the anchorage. The anchorage resists the tension of the main cable. A conventional anchorage system consists of two parts: an embedded part and an exposed part. The embedded part includes spiral reinforcement, embedded pipes, and anchor plates, while the exposed part includes anchor cups, tie rods, nuts, connectors, and anchorages. The connectors are anchored to the anchor face in front of the anchorage by the anchorages and prestressed steel strands. The main cable's single strand is securely anchored by the anchor cup, and the connectors are connected to the anchor cup by the tie rods and nuts. In the design, all components of the exposed part, except for the tie rods and nuts, have protective measures, resulting in a lower risk of corrosion and minimal impact of localized corrosion on the overall structure. For the tie rod structure itself, threads are usually designed at both ends for easy nut tightening, making this part an initial area for corrosion. Based on a systematic survey of the corrosion status of existing bridges, the corrosion damage mechanism not only includes fatigue corrosion but also often involves stress corrosion. Therefore, when assessing the corrosion risk of prestressed tendons, in addition to taking groundwater corrosion into account, the coupling effect of high tensile stress and corrosion should be analyzed in detail.

[0003] Regardless of the measures taken, corrosion is inevitable due to environmental changes. In conventional anchoring systems, the exposed portion is supported by two tie rods that distribute the stress on the main cable strands. Failure of either tie rod will cause irreversible damage, and the other cannot form an anchoring system independently. For a suspension bridge as a whole, the anchoring system is the core element for its balance, precisely balancing the horizontal tension of the main cable and coordinating the internal force transmission between the stiffening girder, towers, and foundation. Instability in the anchoring system will directly induce bridge deck vibration and abnormal alignment, and may even lead to tower overturning and main cable breakage, triggering a catastrophic overall collapse. Therefore, anchoring stability is a decisive factor in ensuring the performance of the main cable and the safety of the bridge structure. Replacing the tie rods and their nuts in a conventional anchoring system requires releasing the stress on the tie rods without affecting the entire anchoring system. Structurally, releasing the stress on the tie rods requires the anchor cup to exert force on the main cable strands towards the connector, a step that is difficult to achieve in a conventional anchoring system.

[0004] Related technologies propose an anchoring structure and construction method for a replaceable anchoring system with tie rods and connectors. This anchoring structure includes prestressed anchor cables, connectors, tie rods, and main cable strands. Additional anchoring components are provided around the prestressed anchor cables, and the tensile load capacity of these additional anchoring components is adapted to the main cable strands. This anchoring structure allows for the replacement of tie rods and connectors simultaneously with the replacement of the prestressed anchor cables, further improving the maintainability and durability of the anchoring structure. However, the core function of the anchorage is to bear the tension of the main cable strands and distribute it to the foundation. The additional anchoring components only provide temporary bearing conditions for the replacement of tie rods and connectors, but they bring multi-dimensional cost increases to the construction of the anchorage. Moreover, the replacement of the anchorage anchoring system is an occasional operation after long-term operation, which makes the use frequency of the additional anchoring components extremely low. The high costs of pre-embedding, construction and reinforcement invested in the early stage cannot be recovered through the small amount of replacement work in the later stage, resulting in a significant reduction in the overall cost-effectiveness of the anchorage. Especially for small and medium span suspension bridges, the additional costs account for a high proportion of the anchorage construction cost, resulting in poor project economics. Summary of the Invention

[0005] The purpose of this invention is to provide a tool and method for replacing tie rods in the anchorage system of a suspension bridge, so as to solve the technical problem of high initial construction costs in the existing anchorage structure and construction method of replaceable anchorage tie rods and connectors.

[0006] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a tool for replacing tie rods in a suspension bridge anchorage system, used for replacing tie rods in a suspension bridge anchorage system. The suspension bridge anchorage system includes embedded components and exposed components. The embedded components include helical reinforcement, embedded pipes, and anchor plates. The exposed components include anchorages, connectors, tie rods, tie rod nuts, and anchor cups. The connectors are anchored to the anchor face in front of the anchorage by the anchorages and prestressed steel strands. The main cable monofilament is securely anchored by the anchor cups. The connectors and the anchor cups are connected by the tie rods and tie rod nuts. The tool for replacing tie rods in a suspension bridge anchorage system includes: The clamping plate assembly is clamped to the side of the connector that is close to the front anchor face of the anchor along the first direction. Its degree of freedom away from the front anchor face along the first direction is constrained by the connector. The first direction is the direction of the tension force applied by the suspension bridge anchoring system to the anchor cup. The pressure beam assembly presses against the side of the anchor cup away from the front anchor surface of the anchor along the first direction, and its degree of freedom towards the front anchor surface of the anchor along the first direction is constrained by the anchor cup. A tie rod assembly for fastening the plate assembly and the pressure beam assembly in the first direction.

[0007] Optionally, the clamping plate assembly includes two U-shaped clamping plates, two clamping plate bolts, and four clamping plate nuts. The two U-shaped clamping plates can be opened in a second direction to form a clamping space and clamp onto the connector on the side of the connector near the front anchor face of the anchorage along the first direction. The second direction is perpendicular to the first direction. Each of the two U-shaped clamping plates has a first through hole extending in the second direction on both side flanges. The two clamping plate bolts are respectively inserted in the first through holes of the two U-shaped clamping plates located on the same side flange along the second direction. Each clamping plate bolt has a clamping plate nut screwed to both ends. The two U-shaped clamping plates, after being enclosed, extend out of the connector at both ends along the second direction, and each of the extended portions at both ends has a second through hole penetrating the U-shaped clamping plate along the first direction.

[0008] Optionally, the snap-fit ​​space formed by the two U-shaped clamps fits into the outer contour of the connector on the side of the anchor face near the anchor along the first direction, so as to prevent the clamp assembly from shifting in the second direction.

[0009] Optionally, the pressure beam assembly includes two pressure plates, each pressure plate having a first groove, a second groove, and a third groove on one side. The first groove, the second groove, and the third groove all extend along the first direction and are spaced apart along the second direction. The two pressure plates can be spliced ​​and fitted onto the main cable monofilament, and the spliced ​​two pressure plates press against the anchor cup on the side away from the anchor face along the first direction. The two second grooves enclose the passage space of the main cable monofilament, and the two first grooves and the two third grooves respectively enclose the passage space of the tie rod assembly.

[0010] Optionally, the other side of the pressing sheet is provided with a first reinforcing arc surface, a second reinforcing arc surface, and a third reinforcing arc surface that are designed to conform to the shape of the first groove, the second groove, and the third groove and are positioned accordingly.

[0011] Optionally, after the two pressure plates are spliced ​​together, they can press against the anchor cup on the side away from the front anchor surface of the anchor along the first direction, and the side of the anchor cup pressed by the two pressure plates is a planar structure.

[0012] Optionally, the pull rod assembly includes two replacement pull rods and four replacement nuts. One of the replacement pull rods can pass through the passage space formed by a second through hole and two first grooves along the first direction, and the other replacement pull rod can pass through the passage space formed by another second through hole and two third grooves along the first direction. Each of the replacement pull rods has a replacement nut screwed to both ends.

[0013] Optionally, the replacement tie rod has the same diameter and material as the tie rod, and the outer diameter of the replacement nut is adapted to the width of the pressure beam assembly to ensure that the pressure beam assembly does not flip after the replacement nut is tightened.

[0014] Optionally, the length of the pressure beam assembly is adapted to the position of the card plate assembly and the second through hole, and the height of the pressure beam assembly is designed according to its own stress stability.

[0015] Secondly, the present invention also provides a method for replacing tie rods in a suspension bridge anchorage system, wherein the aforementioned tie rod replacement tool for the suspension bridge anchorage system is used to replace the corroded tie rods in the suspension bridge anchorage system, and the method further includes the following steps: S1. Attach the clamping plate assembly to the connector on the side of the connector that is close to the front anchor face of the anchor along the first direction, so that the clamping plate assembly and the connector are relatively fixed. S2. Connect one end of the pull rod assembly to the card plate assembly; S3. Press the pressure beam assembly against the anchor cup on the side away from the front anchor surface of the anchor along the first direction, and connect the other end of the tie rod assembly to the pressure beam assembly; S4. Tighten the tie rod assembly in the first direction to gradually release the force on the tie rod; S5. After the tension on the pull rod is completely released, replace the pull rod and the pull rod nut. S6. Loosen the tie rod assembly in the first direction, and sequentially remove the pressure beam assembly, the tie rod assembly, and the clamping plate assembly from the suspension bridge anchorage system.

[0016] The beneficial effects of this invention are: Firstly, this invention provides a tool for replacing tie rods in a suspension bridge anchorage system. By splicing together a clamping plate assembly, a pressure beam assembly, and a tie rod assembly, a temporary force transmission path is constructed between the connector and the anchor cup. Without relying on pre-embedded additional anchorage components, the structural characteristics of the suspension bridge anchorage system allow for the active release of force on the tie rods, thereby enabling the replacement of corroded tie rods and tie rod nuts in the suspension bridge anchorage system. Compared to existing technologies that require pre-embedded additional anchorage components, this tool eliminates the need for prior pre-embedded reinforcement of the anchorage, saving significant pre-embedded construction costs and addressing the issue of poor economic efficiency in small- and medium-span suspension bridge projects. This tool can replace corroded tie rods and tie rod nuts without releasing the tension of the main cable strands or damaging the pre-embedded components of the anchorage system, preventing instability of the suspension bridge anchorage system caused by unilateral tie rod failure, and thus avoiding catastrophic risks such as abnormal bridge deck alignment or tower overturning. The suspension bridge anchorage system tie rod replacement tool is applicable to the replacement of rusted tie rods in all anchorage systems of the same suspension bridge, exhibiting strong versatility. Furthermore, this tool has a simple structure, is easy to assemble, and offers excellent overall ease of operation. Secondly, this invention also provides a method for replacing tie rods in suspension bridge anchorage systems. Compared to existing construction methods that require pre-embedded additional anchorage components, this method significantly reduces initial investment and construction time. Moreover, the operation steps are clear, the risks are controllable, and it is suitable for replacing rusted tie rods in various types of suspension bridges. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the suspension bridge anchorage system described in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the suspension bridge anchorage system described in an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the suspension bridge anchorage system tie rod replacement tool as described in the embodiment of the present invention when it is installed in the suspension bridge anchorage system; Figure 4 This is a schematic diagram of the structure of the suspension bridge anchorage system tie rod replacement tool according to an embodiment of the present invention; Figure 5 This is an exploded view of the suspension bridge anchorage system tie rod replacement tool described in an embodiment of the present invention; Figure 6 This is a schematic diagram showing the connection relationship between the card plate assembly and the connector according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the installation process of the suspension bridge anchorage system tie rod replacement tool described in this embodiment of the invention. Figure 1 ; Figure 8This is a schematic diagram of the installation process of the suspension bridge anchorage system tie rod replacement tool described in this embodiment of the invention. Figure 2 ; Figure 9 This is a schematic diagram of the installation process of the suspension bridge anchorage system tie rod replacement tool described in this embodiment of the invention. Figure 3 .

[0018] In the picture: 100. Embedded component; 110. Spiral reinforcement; 120. Embedded pipe; 130. Anchor plate; 200. Exposed component; 210. Anchor; 220. Connector; 230. Tie rod; 240. Tie rod nut; 250. Anchor cup; 300. Prestressed steel strand; 400. Anchor face in front of anchorage; 500. Main cable monofilament; 1. Clamping plate assembly; 11. U-shaped clamping plate; 111. First through hole; 112. Second through hole; 12. Clamping plate bolt; 13. Clamping plate nut; 2. Pressure beam assembly; 21. Pressure plate; 211. First groove; 212. Second groove; 213. Third groove; 214. Second reinforcing arc surface; 3. Tie rod assembly; 31. Replacement tie rod; 32. Replacement nut. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Firstly, such as Figures 1 to 6 As shown, this invention provides a tool for replacing tie rods in a suspension bridge anchorage system. The suspension bridge anchorage system includes a pre-embedded component 100 and an exposed component 200. The pre-embedded component 100 includes a spiral reinforcement 110, a pre-embedded pipe 120, and an anchor plate 130. The exposed component 200 includes an anchor 210, a connector 220, a tie rod 230, a tie rod nut 240, and an anchor cup 250. The connector 220 is anchored to the anchor face 400 in front of the anchorage by the anchor 210 and prestressed steel strand 300. The main cable monofilament 500 is securely anchored by the anchor cup 250. The connector 220 and the anchor cup 250 are connected by the tie rod 230 and the tie rod nut 240. The suspension bridge anchorage system tie rod replacement tool includes a clamping plate assembly 1, a pressure beam assembly 2, and a tie rod assembly 3. The clamping plate assembly 1 engages with the connector 220 along a first direction (X direction in the figure) near the anchor face 400 of the anchorage. Its degree of freedom along the first direction away from the anchor face 400 is constrained by the connector 220. The first direction is the direction of the tension force applied by the suspension bridge anchorage system to the anchor cup 250. The pressure beam assembly 2 presses against the anchor cup 250 along the first direction away from the anchor face 400. Its degree of freedom along the first direction near the anchor face 400 is constrained by the anchor cup 250. The tie rod assembly 3 is used to securely connect the clamping plate assembly 1 and the pressure beam assembly 2 in the first direction.

[0024] The suspension bridge anchorage system tie rod replacement tool, through the splicing of the clamping plate assembly 1, the pressure beam assembly 2, and the tie rod assembly 3, constructs a temporary force transmission path between the connector 220 and the anchor cup 250. Without relying on pre-embedded additional anchoring components, it utilizes the structural characteristics of the suspension bridge anchorage system to actively release the force on the tie rod 230, thereby completing the replacement of the corroded tie rod 230 and tie rod nut 240 in the suspension bridge anchorage system. Compared to existing technologies that pre-embed additional anchoring components, this suspension bridge anchorage system tie rod replacement tool eliminates the need for prior pre-embedded reinforcement of the anchorage, saving significant pre-embedded construction costs and solving the problem of poor economic efficiency in small-to-medium span suspension bridge projects. The suspension bridge anchorage system tie rod replacement tool can replace corroded tie rods 230 and tie rod nuts 240 without releasing the 500 tension of the main cable monofilament and without damaging the pre-embedded components 100 of the anchorage system. This avoids instability of the suspension bridge anchorage system caused by the failure of a single tie rod 230, thereby preventing catastrophic risks such as abnormal bridge deck alignment or tower overturning. Furthermore, the suspension bridge anchorage system tie rod replacement tool is applicable to the replacement of corroded tie rods in all anchorage systems of the same suspension bridge, demonstrating strong versatility. Moreover, the tool has a simple structure, is easy to assemble, and offers excellent overall ease of operation.

[0025] Specifically, such as Figures 3 to 5 As shown, the clamping plate assembly 1 includes two U-shaped clamping plates 11, two clamping plate bolts 12, and four clamping plate nuts 13. The two U-shaped clamping plates 11 can be opened relative to each other along a second direction (Y direction in the figure) to form a clamping space and clamp onto the side of the connector 220 near the anchor face 400 of the anchorage along a first direction, the second direction being perpendicular to the first direction. Each of the two U-shaped clamping plates 11 has a first through hole 111 extending along the second direction on both sides of its flange. The two clamping plate bolts 12 are respectively inserted into the first through holes 111 on the same side flange of the two U-shaped clamping plates 11 along the second direction, and each clamping plate bolt 12 has a clamping plate nut 13 screwed to both ends. After being enclosed, the two U-shaped clamping plates 11 extend out of the connector 220 at both ends along the second direction, and each of the extended portions has a second through hole 112 penetrating through the U-shaped clamping plate 11 along the first direction. Two U-shaped clamping plates 11 are connected by clamping plate bolts 12 and clamping plate nuts 13, forming a detachable snap-fit ​​structure. This allows the clamping plate assembly 1 to be quickly installed and disassembled without damaging the connector 220, adapting to confined working spaces and improving the connection stability between the clamping plate assembly 1 and the connector 220. The two ends of the U-shaped clamping plates 11 extend beyond the connector 220 and have second through holes 112, providing a clear connection point for the tie rod assembly 3. This ensures a clear force transmission path and uniform force distribution, improving the ease of operation and reliability of the tie rod replacement tool for the suspension bridge anchorage system.

[0026] Furthermore, such as Figure 6 As shown, the locking space formed by the two U-shaped clamping plates 11 fits against the outer contour of the connector 220 on the side near the anchor face 400 of the anchorage along the first direction, to prevent displacement of the clamping plate assembly 1 in the second direction. The fit between the locking space and the outer contour of the connector 220 limits the clamping plate assembly 1 in the second direction, preventing lateral slippage or deflection of the clamping plate assembly 1 during the tightening of the tie rod assembly 3, ensuring the alignment of the temporary force transmission path, avoiding additional damage to the connector 220 or anchor cup 250 caused by eccentric loading, and improving the safety and reliability of the replacement operation.

[0027] For example, such as Figure 4 and Figure 5As shown, the pressure beam assembly 2 includes two pressure plates 21. Each pressure plate 21 has a first groove 211, a second groove 212, and a third groove 213 on one side. The first groove 211, the second groove 212, and the third groove 213 all extend along a first direction and are spaced apart along a second direction. The two pressure plates 21 can be spliced ​​and fitted onto the main cable monofilament 500, and the spliced ​​two pressure plates 21 press against the side of the anchor cup 250 away from the anchor face 400 in the first direction. The two second grooves 212 enclose the passage space of the main cable monofilament 500, and the two first grooves 211 and the two third grooves 213 respectively enclose the passage space of the tie rod assembly 3. The pressure beam assembly 2 adopts a structural design in which two pressure plates 21 are spliced ​​and fitted onto the main cable monofilament 500, which not only achieves the pressing against the anchor cup 250 but also avoids interference with the main cable monofilament 500. The first groove 211 and the third groove 213 provide precise passage space for the tie rod assembly 3, and the second groove 212 provides passage space for the main cable monofilament strand 500, so that the pressure beam assembly 2 can simultaneously perform the three functions of pressing, connecting and avoiding. The structure is compact and reduces the overall weight and complexity of the tie rod replacement tool for the suspension bridge anchorage system.

[0028] Furthermore, such as Figure 5 As shown, on the other side of the pressure plate 21, there are respectively a first reinforcing arc surface, a second reinforcing arc surface 214, and a third reinforcing arc surface that are designed to conform to the first groove 211, the second groove 212, and the third groove 213 and are positioned accordingly. By providing reinforcing arc surfaces that conform to the grooves on the other side of the pressure plate 21, the deformation resistance of the pressure plate 21 under stress is significantly improved. When the tie rod assembly 3 is tightened, it will generate a large bending stress on the pressure plate 21. The reinforcing arc surfaces can effectively disperse the stress concentration, prevent the pressure plate 21 from undergoing plastic deformation or fracture, and ensure the durability and reliability of the pressure beam assembly 2 in repeated use.

[0029] Furthermore, after the two pressure plates 21 are spliced, they can press against the side of the anchor cup 250 away from the front anchor surface 400 along the first direction, and the side of the anchor cup 250 pressed by the two pressure plates 21 is a planar structure. This ensures that the contact between the pressure beam assembly 2 and the end face of the anchor cup 250 is a surface contact rather than a line contact or point contact, avoiding excessive local compressive stress that could cause indentations or damage to the anchor cup 250. At the same time, it ensures the stability of the pressure beam assembly 2 itself under stress, and prevents it from tilting or slipping due to uneven contact surfaces.

[0030] Optionally, such as Figure 4 and Figure 5As shown, the tie rod assembly 3 includes two replacement tie rods 31 and four replacement nuts 32. One replacement tie rod 31 can pass through the passage space formed by a second through hole 112 and two first grooves 211 along the first direction, and the other replacement tie rod 31 can pass through the passage space formed by another second through hole 112 and two third grooves 213 along the first direction. Each replacement tie rod 31 has a replacement nut 32 screwed to both ends. By using two replacement tie rods 31 to pass through the second through holes 112 on both sides of the clamping plate assembly 1 and the passage space formed by the two first grooves 211 and two third grooves 213 of the pressure beam assembly 2, and fastening them with the replacement nuts 32 at both ends, a symmetrical temporary force transmission path is formed, so that the temporary tension can be evenly transmitted to both sides of the anchor cup 250, avoiding the eccentric load or torsion caused by the anchor cup 250 being subjected to force on one side. The threaded connection between the replacement tie rod 31 and the replacement nut 32 allows construction personnel to precisely control the tightening torque, thereby achieving a gradual release of the force on the tie rod 230 of the suspension bridge anchorage system.

[0031] Furthermore, the replacement tie rod 31 has the same diameter and material as the tie rod 230, and the outer diameter of the replacement nut 32 is matched with the width of the pressure beam assembly 2 to ensure that the pressure beam assembly 2 does not overturn after the replacement nut 32 is tightened. The replacement tie rod 31 uses the same diameter and material as the tie rod 230, ensuring that the load-bearing capacity of the temporary force transmission path is not lower than the requirements of the suspension bridge anchorage system, thus avoiding safety risks caused by insufficient load-bearing capacity. The matching outer diameter of the replacement nut 32 with the width of the pressure beam assembly 2 allows the replacement nut 32 to completely press against the surface of the pressure beam assembly 2 after tightening, preventing the pressure beam assembly 2 from overturning during stress and ensuring the stability of the pressure beam assembly 2's pressing posture.

[0032] Optionally, the length of the pressure beam assembly 2 is adapted to the position of the clamping plate assembly 1 and the second through hole 112, and the height of the pressure beam assembly 2 is designed according to its own stress stability. The adaptation of the length of the pressure beam assembly 2 to the position of the clamping plate assembly 1 and the second through hole 112 ensures that the replacement tie rod 31 can pass vertically through the corresponding hole and groove, avoiding additional bending moment. The height of the pressure beam assembly 2, designed according to its own stress stability, can reduce its self-weight while meeting strength requirements, preventing the pressure beam assembly 2 from becoming unstable under enormous pressure, and ensuring the integrity of the suspension bridge anchorage system tie rod replacement tool under extreme stress conditions.

[0033] Secondly, such as Figures 7 to 9 As shown, the present invention also provides a method for replacing tie rods in a suspension bridge anchorage system. The method utilizes the aforementioned tie rod replacement tool to replace corroded tie rods in the suspension bridge anchorage system. The method further includes the following steps: S1. Snap the clamping plate assembly 1 onto the side of the connector 220 near the front anchor surface 400 of the anchor along the first direction, so that the clamping plate assembly 1 and the connector 220 are relatively fixed; specifically, after the clamping plate assembly 1 is snapped onto the connector 220, it should at least be ensured that the degree of freedom of the clamping plate assembly 1 away from the front anchor surface 400 of the anchor along the first direction is constrained by the connector 220.

[0034] S2. Connect one end of the pull rod assembly 3 to the clamping plate assembly 1; specifically, when the pull rod assembly 3 includes a replacement pull rod 31 and a replacement nut 32, the two replacement pull rods 31 can be temporarily constrained by a hand chain hoist after being connected to the clamping plate assembly 1.

[0035] S3. Press the pressure beam assembly 2 against the anchor cup 250 on the side away from the anchor face 400 in the first direction, and connect the other end of the tie rod assembly 3 to the pressure beam assembly 2. Specifically, after the pressure beam assembly 2 is pressed against the anchor cup 250, it should at least ensure that the degree of freedom of the pressure beam assembly 2 along the first direction near the anchor face 400 is constrained by the anchor cup 250. After the other end of the tie rod assembly 3 is connected to the pressure beam assembly 2, it should at least ensure that the pressure beam assembly 2 does not overturn.

[0036] S4. Tighten the tie rod assembly 3 in the first direction to gradually release the force on the tie rod 230; specifically, the operator can use tools such as a hydraulic bolt tensioner or a high-torque hydraulic wrench to tighten the tie rod assembly 3.

[0037] S5. After the force on the tie rod 230 is completely released, replace the tie rod 230 and the tie rod nut 240. Specifically, the operator can install a tie rod stress gauge on the surface of the tie rod 230 to detect the tension on the tie rod 230. Only after the force on the tie rod 230 drops to zero can the tie rod 230 and the tie rod nut 240 be disassembled and replaced to avoid the tie rod nut 240 breaking off and causing injury to the operator.

[0038] S6. Loosen the tie rod assembly 3 in the first direction, and remove the pressure beam assembly 2, tie rod assembly 3, and clamping plate assembly 1 from the suspension bridge anchorage system in sequence. Specifically, after replacing the tie rod 230 and tie rod nut 240, remove the tie rod replacement tool from the suspension bridge anchorage system to replace the rusted tie rod of the next suspension bridge anchorage system.

[0039] This method for replacing tie rods in the suspension bridge anchorage system involves sequentially installing the clamping plate assembly 1, tie rod assembly 3, and pressure beam assembly 2, and gradually releasing the stress on the tie rod 230 during the tightening of the tie rod assembly 3. This achieves the replacement of tie rod 230 without damage or additional components. Compared to existing construction methods that require pre-embedded additional anchoring components, this method significantly reduces upfront investment and construction time. Furthermore, the operation steps are clear, the risks are controllable, and it is suitable for replacing corroded tie rods in various types of suspension bridges.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A tool for replacing tie rods in a suspension bridge anchorage system, used for replacing tie rods in a suspension bridge anchorage system, wherein the suspension bridge anchorage system includes a pre-embedded component (100) and an exposed component (200), the pre-embedded component (100) includes a spiral reinforcement (110), a pre-embedded pipe (120), and an anchor plate (130), the exposed component (200) includes an anchor (210), a connector (220), a tie rod (230), a tie rod nut (240), and an anchor cup (250), the connector (220) is anchored to the anchor face (400) in front of the anchorage by means of the anchor (210) and prestressed steel strand (300), the main cable monofilament (500) is securely anchored by means of the anchor cup (250), the connector (220) and the anchor cup (250) are connected by means of the tie rod (230) and the tie rod nut (240), characterized in that, The suspension bridge anchorage system tie rod replacement tool includes: The clamping plate assembly (1) is clamped to the side of the connector (220) close to the front anchor surface (400) of the anchor in the first direction. Its degree of freedom away from the front anchor surface (400) of the anchor in the first direction is constrained by the connector (220). The first direction is the direction of the tension force applied by the suspension bridge anchoring system to the anchor cup (250). The pressure beam assembly (2) presses against the anchor cup (250) on the side away from the front anchor surface (400) of the anchor along the first direction, and its degree of freedom to approach the front anchor surface (400) of the anchor along the first direction is constrained by the anchor cup (250). A tie rod assembly (3) is used to fasten the plate assembly (1) and the pressure beam assembly (2) in the first direction.

2. The suspension bridge anchorage system tie rod replacement tool according to claim 1, characterized in that, The clamping plate assembly (1) includes two U-shaped clamping plates (11), two clamping plate bolts (12), and four clamping plate nuts (13). The two U-shaped clamping plates (11) can be opened in the second direction to form a clamping space and clamp onto the connector (220) on the side of the anchor face (400) of the anchor in the first direction. The second direction is perpendicular to the first direction. The two U-shaped clamping plates (11) have first through holes (111) extending in the second direction on both sides of their flanges. Two clamping bolts (12) are respectively inserted into the first through holes (111) of the two U-shaped clamping plates (11) located on the same side flange along the second direction. Each clamping bolt (12) is screwed with a clamping nut (13) at both ends. The two U-shaped clamping plates (11) after being enclosed extend out of the connector (220) at both ends along the second direction, and a second through hole (112) is opened on the extended part at both ends, which penetrates the U-shaped clamping plate (11) along the first direction.

3. The suspension bridge anchorage system tie rod replacement tool according to claim 2, characterized in that, The two U-shaped clamps (11) enclose the snap-fit ​​space and the outer contour of the connector (220) along the first direction near the front anchor surface (400) of the anchor, so as to avoid displacement of the clamp assembly (1) in the second direction.

4. The suspension bridge anchorage system tie rod replacement tool according to claim 2, characterized in that, The pressure beam assembly (2) includes two pressure plates (21). Each pressure plate (21) has a first groove (211), a second groove (212), and a third groove (213) on one side. The first groove (211), the second groove (212), and the third groove (213) extend along the first direction and are spaced apart along the second direction. The two pressure plates (21) can be spliced ​​and fitted onto the main cable monofilament (500). The spliced ​​two pressure plates (21) press against the anchor cup (250) on the side away from the anchor face (400) of the anchor in the first direction. The two second grooves (212) enclose the passage space of the main cable monofilament (500). The two first grooves (211) and the two third grooves (213) respectively enclose the passage space of the tie rod assembly (3).

5. The suspension bridge anchorage system tie rod replacement tool according to claim 4, characterized in that, On the other side of the pressure plate (21), there are respectively a first reinforcing arc surface, a second reinforcing arc surface (214) and a third reinforcing arc surface that are designed to conform to the shape of the first groove (211), the second groove (212) and the third groove (213) and are positioned accordingly.

6. The suspension bridge anchorage system tie rod replacement tool according to claim 4, characterized in that, After the two pressure plates (21) are spliced ​​together, they can press against the anchor cup (250) on the side away from the front anchor surface (400) of the anchor along the first direction, and the two pressure plates (21) pressing against the side of the anchor cup (250) are planar structures.

7. The suspension bridge anchorage system tie rod replacement tool according to claim 4, characterized in that, The pull rod assembly (3) includes two replacement pull rods (31) and four replacement nuts (32). One of the replacement pull rods (31) can pass through the passage space formed by a second through hole (112) and two first grooves (211) along the first direction. The other replacement pull rod (31) can pass through the passage space formed by another second through hole (112) and two third grooves (213) along the first direction. Each of the replacement pull rods (31) has a replacement nut (32) screwed to both ends.

8. The suspension bridge anchorage system tie rod replacement tool according to claim 7, characterized in that, The diameter and material of the replacement pull rod (31) are the same as those of the pull rod (230), and the outer diameter of the replacement nut (32) is matched with the width of the pressure beam assembly (2) to ensure that the pressure beam assembly (2) does not flip after the replacement nut (32) is tightened.

9. The suspension bridge anchorage system tie rod replacement tool according to claim 8, characterized in that, The length of the pressure beam assembly (2) is adapted to the position of the card plate assembly (1) and the second through hole (112), and the height of the pressure beam assembly (2) is designed according to its own stress stability.

10. A method for replacing tie rods in the anchorage system of a suspension bridge, characterized in that, The method for replacing corroded tie rods in the suspension bridge anchorage system using the tie rod replacement tool as described in any one of claims 1-9 further includes the following steps: S1. Snap the clamping plate assembly (1) onto the side of the connector (220) along the first direction near the front anchor surface (400) of the anchor, so that the clamping plate assembly (1) and the connector (220) are relatively fixed together; S2. Connect one end of the pull rod assembly (3) to the card plate assembly (1); S3. Press the pressure beam assembly (2) against the anchor cup (250) on the side away from the front anchor surface (400) of the anchor along the first direction, and connect the other end of the tie rod assembly (3) to the pressure beam assembly (2). S4. Tighten the pull rod assembly (3) in the first direction to gradually release the force on the pull rod (230); S5. After the force on the pull rod (230) is completely released, replace the pull rod (230) and the pull rod nut (240). S6. Loosen the tie rod assembly (3) in the first direction and remove the pressure beam assembly (2), the tie rod assembly (3) and the clamping plate assembly (1) from the suspension bridge anchorage system in sequence.

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