Method for dismantling and rebuilding a cable-stayed bridge

Abstract

The application provides a cable-stayed bridge dismantling and reconstruction method for assisting the dismantling and reconstruction of a cable-stayed bridge, which comprises the following steps: erecting a flat rotating support on both sides of a cable-stayed bridge pier body, erecting a rotating system on a cable-stayed bridge bearing platform, assisting the flat and straight rotating of an old and dangerous cable-stayed bridge through the rotating system, and assisting the flat and straight rotating of a newly-built cable-stayed bridge, so that the bridge construction overcomes the restrictions of terrain, traffic, environment and other conditions, reduces the influence on the environment and road traffic, and maximizes the original stress distribution of the main beam when the old and dangerous cable-stayed bridge is flatly and straightly rotated, so that the original stress points of the main beam are not changed, and the stable rotation of the main beam is ensured; the flat rotating support bears the main beam of the cable-stayed bridge after the rotating, or the main beam is assembled and connected on the flat rotating support, so that the construction efficiency is greatly improved, and the construction progress is greatly accelerated.

Description

Technical Field

[0001] This application relates to the technical field of methods or equipment specifically for erecting or assembling bridges, and specifically to a method for dismantling and rebuilding a cable-stayed bridge. Background Technology

[0002] A cable-stayed bridge, also known as a skeletal bridge, is a type of bridge in which the main beam is directly attached to the bridge towers by numerous cables. It is a structural system composed of pressure-bearing towers, tension-bearing cables, and bending-bearing beams.

[0003] A cable-stayed bridge is a bridge in which a beam is supported by several stay cables to towers. It consists of three parts: the beam, the stay cables, and the towers. A cable-stayed bridge is a self-anchored system, where the horizontal forces of the stay cables are borne by the beam. In addition to being supported on the piers, the beam is also supported by the stay cables extending from the towers.

[0004] To overcome the constraints of terrain, traffic, and environment in bridge construction, minimize the impact on the environment and road traffic, save on project costs, shorten the construction period, and ensure the safety and reliability of the construction process, the rotation method is now commonly used in bridge construction. The rotation method has become an important technique in bridge construction. For example, in the construction of railway bridges, the rotation method is used to ensure the safety of train traffic on operating railway lines, preventing any disruption to train passage during bridge construction. Similarly, in the construction of bridges over waterways, the rotation method is used to avoid long-term construction affecting the normal operation of waterways.

[0005] Furthermore, demolition plans for old and dangerous bridges must consider their specific characteristics. Some old and dangerous bridges are severely damaged and unusable, with low load-bearing capacity of their bridge decks (main beams) and uncertain load-bearing structures, making it difficult to determine the center of gravity and load-bearing points of the bridge deck (main beams). Currently, there are three main demolition plans for old and dangerous bridges:

[0006] 1. The traditional method of dismantling the bridge section by section using a bridge deck crane is technically mature, but there are many sections to be dismantled within the waterway (on one side), resulting in frequent temporary closures of navigation. The dismantling by bridge deck crane is continuous and has a long dismantling cycle. The front support of the bridge deck crane is subjected to high stress, which requires high strength of the main beam of the bridge. For dangerous bridges, the main beam needs to be reinforced before dismantling. Moreover, the load-bearing structure of dangerous bridges is uncertain, and it is difficult to determine the reinforcement points. If the reinforcement range is expanded, the cost will increase significantly.

[0007] 2. The method of dismantling large sections of ships is fast, but it requires interrupting the waterway during dismantling. The single closure time is long. If the slack tide time in the water is short, the real-time leveling of the ship and machinery during high tide and low tide is highly demanding. The process is complicated, the connection requirements are high, the control is difficult, and the risk is high.

[0008] 3. The rotation method is adopted for demolition. For old and dangerous bridges, the main beam bears a large concentrated load. Moreover, due to the uncertainty of the load-bearing structure and stress points of the main beam, the stress points of the main beam are not easy to change. The commonly used rotation method is not applicable.

[0009] The applicant has proposed a solution for the demolition and reconstruction of old and dangerous cable-stayed bridges. Summary of the Invention

[0010] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for the demolition and reconstruction of cable-stayed bridges, the technical solution of which includes:

[0011] A method for demolishing and rebuilding a cable-stayed bridge, including:

[0012] The method for dismantling the bridge includes the following steps:

[0013] (1) Erect a horizontal rotation support frame;

[0014] A horizontal rotation support is erected on both sides of the pier of the cable-stayed bridge. The horizontal rotation support is set parallel to the waterway and perpendicular to the main beam of the cable-stayed bridge.

[0015] (2) A rotating system is erected on the pier of the cable-stayed bridge. The rotating system includes a rotating structure set on the top surface of the pier and support feet set on the rotating structure. The rotating structure is arranged around the outer ring of the pier body. At least one pair of support feet are provided on the rotating structure. The pair of support feet are symmetrically arranged facing each other. The bottom of the support feet rests on the rotating structure and can rotate relative to the rotating structure. The support feet are fixedly connected to the pier body.

[0016] (3) A side span dismantling support is erected under the main beam of the non-cable-stayed bridge section connected to the cable-stayed bridge, and the side span dismantling support is set on both sides of the cable-stayed bridge.

[0017] (4) Symmetrically remove the cable stays on the outer side of the cable-stayed bridge; symmetrically remove the closure section of the cable-stayed bridge;

[0018] (5) Cut the connection between the cable-stayed bridge pier and the abutment;

[0019] (6) A cable-stayed bridge that rotates horizontally via a rotation system;

[0020] (7) The main beam of the cable-stayed bridge stops after rotating above the horizontal rotation support, and the horizontal rotation support moves up and is lifted below the main beam of the cable-stayed bridge;

[0021] (8) Remove all stay cables; dismantle tower columns in sections; cut main beams, first dismantle the main beams at the top of the piers of the cable-stayed bridge, and then dismantle the remaining main beams of the cable-stayed bridge;

[0022] (9) Remove the piers of the cable-stayed bridge;

[0023] (10) Remove the side span support;

[0024] The reconstruction method includes the following steps:

[0025] (11) Set up a rotating system on the existing cable-stayed bridge pier. First, build a rotating structure on the pier, and then build a pair of symmetrically arranged support legs on the rotating structure.

[0026] (12) The pier body of the cable-stayed bridge is constructed on the pier cap. The side of the pier body is fixedly connected to the support foot, and the pier body and the pier cap are not connected, and there is a gap between the two.

[0027] (13) Install the main beam at the top of the cable-stayed bridge pier on the pier body of the cable-stayed bridge;

[0028] (14) Install the lower tower columns of the cable-stayed bridge in segments; install the main beam of the continuous beam of the cable-stayed bridge in segments on the horizontal rotation support; install the upper tower columns of the cable-stayed bridge;

[0029] (15) Install the stay cables of the cable-stayed bridge;

[0030] (16) The cable-stayed bridge is rotated horizontally by the rotation system to complete the horizontal rotation of the cable-stayed bridge.

[0031] According to an embodiment of the present invention, a method for demolishing and rebuilding a cable-stayed bridge includes step (1) of constructing a pier cofferdam around the abutment of the cable-stayed bridge.

[0032] According to an embodiment of the present invention, in a method for dismantling and rebuilding a cable-stayed bridge, in step (6), before the cable-stayed bridge is rotated using a rotation system, the main beam of the cable-stayed bridge needs to be counterweighted.

[0033] According to an embodiment of the present invention, in a method for dismantling and rebuilding a cable-stayed bridge, the supporting leg in the rotation system is an arc-shaped structure, and the inner side of the supporting leg wraps around the outer wall of the pier and fits against the pier and is fixedly connected to the pier.

[0034] According to an embodiment of the present invention, a method for dismantling and rebuilding a cable-stayed bridge includes a rotating structure comprising an annular slide and a rotating traction system, wherein the base of the supporting leg rests on the annular slide.

[0035] According to an embodiment of the present invention, in a method for dismantling and rebuilding a cable-stayed bridge, in steps (2) and (11), when erecting the rotation system, multiple limiting guide walls must be set on the bearing platform of the outer ring of the rotation structure.

[0036] According to an embodiment of the present invention, a method for dismantling and rebuilding a cable-stayed bridge includes the following steps:

[0037] (17) After the cable-stayed bridge completes its rotation, the piers and abutments of the cable-stayed bridge are connected by grouting filler in the gap between the piers and abutments. After curing, the piers and abutments are connected as one.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] This invention provides a method for the demolition and reconstruction of cable-stayed bridges. It involves erecting horizontal rotation supports on both sides of the bridge piers and a rotation system on the bridge's abutments. This system assists in the horizontal rotation of old and dangerous cable-stayed bridges, as well as newly constructed cable-stayed bridges. This allows bridge construction to overcome constraints imposed by terrain, traffic, and the environment, reducing the impact on the environment and road traffic. When performing horizontal rotation on old and dangerous cable-stayed bridges, the original stress distribution of the main girder is maintained to the maximum extent possible, ensuring the smooth rotation of the main girder. The horizontal rotation supports support the rotated main girder, or the main girder is assembled and connected on the horizontal rotation supports, greatly improving construction efficiency and significantly accelerating the construction progress. Attached Figure Description

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0041] Figure 1 This is a schematic diagram of the bridge dismantling method for the composite bridge system in the embodiments of this application. Figure 1 ;

[0042] Figure 2 This is a schematic diagram of the bridge dismantling method for the composite bridge system in the embodiments of this application. Figure 2 ;

[0043] Figure 3 This is a schematic diagram of the bridge dismantling method for the composite bridge system in the embodiments of this application. Figure 3 ;

[0044] Figure 4 This is a schematic diagram of the bridge dismantling method for the composite bridge system in the embodiments of this application. Figure 4 ;

[0045] Figure 5 This is a schematic diagram of the bridge dismantling method for the composite bridge system in the embodiments of this application. Figure 5 ;

[0046] Figure 6 This is a schematic diagram of the bridge dismantling method for the composite bridge system in the embodiments of this application. Figure 6 ;

[0047] Figure 7 This is a schematic diagram of the bridge dismantling method for the composite bridge system in the embodiments of this application. Figure 7 ;

[0048] Figure 8 This is a schematic diagram of the reconstruction method of the composite bridge system in the embodiments of this application. Figure 1 ;

[0049] Figure 9 This is a schematic diagram of the reconstruction method of the composite bridge system in the embodiments of this application. Figure 2 ;

[0050] Figure 10 This is a schematic diagram of the reconstruction method of the composite bridge system in the embodiments of this application. Figure 3 ;

[0051] Figure 11 This is a schematic diagram of the reconstruction method of the composite bridge system in the embodiments of this application. Figure 4 .

[0052] Explanation of key component symbols:

[0053] 10. Pile foundation; 20. Cofferdam; 30. Pier cap; 40. Pier body; 50. Pier top main beam; 51. Continuous beam main beam; 60. Tower column; 70. Cable stays; 80. Support foot; 90. Circular slide; 100. Limiting guide wall; 110. Rotation traction system; 120. Horizontal rotation support; 130. Continuous beam bridge; 140. Counterweight block; 150. Side span dismantling support; 160. Sliding support. Detailed Implementation

[0054] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0055] In the description of this invention, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0056] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are 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 limiting this invention.

[0057] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium; they can refer to fixed connection, detachable connection, or integral molding; they can refer to mechanical connection; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0058] The following example illustrates the demolition and reconstruction of a specific water-based composite bridge system. This system includes a cable-stayed bridge situated in the water and a continuous beam bridge 130 connecting the two sides of the cable-stayed bridge. Figures 1 to 11 As shown:

[0059] The main components of a cable-stayed bridge include pile foundations 10, abutments 30, piers 40, main beams (the main beams of the cable-stayed bridge consist of the continuous beam 51 and the pier top main beams 50), towers 60, and stay cables 70.

[0060] The continuous beam bridge 130 includes pile foundations, abutments, piers, and main beams;

[0061] A method for dismantling and reconstructing a composite bridge system, comprising:

[0062] Methods of bridge dismantling, such as Figures 1 to 7 As shown, it includes the following steps:

[0063] (1) Erect a horizontal rotation support 120 (e.g.) Figure 1 , 2 (as shown);

[0064] A horizontal rotation support 120 is erected on both sides of the pier 40 of the cable-stayed bridge. The horizontal rotation support 120 is set parallel to the waterway and perpendicular to the main beam of the cable-stayed bridge.

[0065] A 20-meter cofferdam is constructed around the pier cap of the cable-stayed bridge (e.g., 30 meters away from the pier foundation). Figure 1 , 2 (as shown);

[0066] (2) Construct a rotation system (such as...) on the pier 30 of the cable-stayed bridge. Figure 3 , 4As shown in the diagram, the rotation system includes a rotation structure mounted on the top surface of the pier 30 and support legs 80 mounted on the rotation structure. The rotation structure surrounds the outer ring of the pier body 40. At least one pair of support legs 80 are provided on the rotation structure, symmetrically arranged facing each other. The bottom of each support leg 80 rests on the rotation structure and can rotate relative to it. The support legs 80 are fixedly connected to the pier body 40. Specifically, the rotation structure includes an annular slide 90 and a rotation traction mechanism. In system 110, the base of the support leg 80 rests on the annular slide 90. The support leg 80 has an arc-shaped structure. The inner side of the support leg 80 wraps around the outer wall of the pier body 40 and fits against the pier body 40 and is fixedly connected to the pier body 40. In order to ensure the stability of the support leg 80 during the subsequent rotation operation and to prevent displacement on the pier platform 30, multiple limiting guide walls 100 must be set on the pier platform 30 of the outer ring of the rotation structure when the rotation system is erected. The limiting guide walls 100 limit the support leg 80.

[0067] (3) Erect a 150mm side span dismantling scaffolding under the main beam of the non-cable-stayed bridge section connected to the cable-stayed bridge (e.g., Figure 3 , 4 As shown), the side span removal support 150 is set on both sides of the cable-stayed bridge;

[0068] (4) Symmetrically remove the cable stays 70 on the outer side of the cable-stayed bridge; symmetrically remove the closure section of the cable-stayed bridge to separate the cable-stayed bridge from the non-cable-stayed continuous beam bridge 130.

[0069] (5) The connection between the cable-stayed bridge pier 40 and the abutment 30 is circumferentially cut (e.g., Figure 5 As shown), the circumferential cut Q is located at the lower end of the connection between the pier body 40 and the pile cap 30;

[0070] (6) The main girder of the cable-stayed bridge is counterweighted by a counterweight block 140 (e.g. Figure 5 As shown in the figure, after the cofferdam 20, temporary piers need to be erected on both sides of the pier 40 of the cable-stayed bridge, and force gauges need to be installed. Before the cable-stayed bridge rotates, according to the difference in the force gauge readings on both sides, a counterweight is added at the end with the smaller force value so that the bending moment at the root of the cable-stayed bridge is zero.

[0071] A cable-stayed bridge that is rotated horizontally via a rotation system (such as...) Figure 6 As shown), specifically, the support leg 80 is rotated on the annular slide 90 by the rotation traction system 110. In this way, the pier 40 connected to the support leg 80, as well as the main beam and tower column 60 on the pier 40, rotate together to complete the rotation of the cable-stayed bridge.

[0072] For non-cable-stayed continuous beam bridges, the main beams were symmetrically dismantled using a bridge deck crane.

[0073] (7) After the main girder of the cable-stayed bridge rotates to a position above the horizontal rotation support 120, it stops. The horizontal rotation support 120 then moves upward and is lifted to a position below the main girder of the cable-stayed bridge. At this point, all the weight of the main girder is borne by the horizontal rotation support 120 (e.g., Figure 7 (as shown);

[0074] (8) Remove all cable stays 70; remove tower columns 60 in sections; cut the main beam, first remove the main beam 50 at the top of the pier of the cable-stayed bridge, and then remove the remaining main beams of the cable-stayed bridge (the main beam 51 of the continuous beam and the main beam 50 at the top of the pier are connected to form the main beam of the cable-stayed bridge). In fact, the main beam is supported on the horizontal rotation support 120. After the main beam is cut, the removal of the main beam 51 of each section of the continuous beam and the removal of the main beam 50 at the top of the pier can be carried out simultaneously without prioritizing or symmetrically removing them, which greatly speeds up the removal of the main beam.

[0075] (9) Demolish 40 piers of cable-stayed bridges; demolish 130 piers and pile foundations of non-cable-stayed continuous beam bridges;

[0076] (10) Remove the side span dismantling support 150. At this point, the dismantling of the cable-stayed bridge (pier 40, main beam, tower column 60, cable stay 70) and the continuous beam bridge 130 (main beam, pier, pile foundation) is completed.

[0077] Reconstruction methods, such as Figures 8 to 11 As shown, it includes the following steps:

[0078] (11) On the original cable-stayed bridge's pier 30, there are still some previously erected rotating structures (such as...). Figure 8 (As shown) (the support leg 80 was removed along with the pier body 40 of the cable-stayed bridge), a pair of symmetrically arranged support legs 80 need to be built on the rotating structure;

[0079] (12) Construct the cable-stayed bridge pier 40 on the abutment 30 of the cable-stayed bridge (e.g., Figure 8 As shown), the side of the pier body 40 is fixedly connected to the support leg 80, and the pier body 40 is not connected to the foundation 30, with a gap between them.

[0080] (13) Construct the pile foundations, abutments, and piers of the non-cable-stayed continuous beam bridge 130, and install the sliding support 160 and assembly support (such as...) of the continuous beam bridge 130. Figure 9 (as shown);

[0081] (14) Install the main beam 50 of the cable-stayed bridge pier on the pier body 40 of the cable-stayed bridge (e.g., Figure 9 (as shown);

[0082] (15) Install the lower tower columns of the cable-stayed bridge in segments; install the main beam 51 of the continuous beam of the cable-stayed bridge in segments on the horizontal rotation support 120. Here, the main beam 51 of the continuous beam of the cable-stayed bridge is assembled on the horizontal rotation support 120, and the assembled main beam 51 of the continuous beam is connected to the main beam 50 on the pier top to complete the construction of the main beam of the cable-stayed bridge; install the upper tower columns of the cable-stayed bridge;

[0083] (16) Install 70mm of cable-stayed bridge stay cables;

[0084] (17) Install the main beam of the 130mm non-cable-stayed continuous beam bridge;

[0085] (18) A cable-stayed bridge that rotates horizontally via a rotation system (such as...) Figure 10 As shown), finally, the main beam of the cable-stayed bridge is made to be straight with the main beam of the continuous beam bridge 130 of the non-cable-stayed bridge;

[0086] (19) The closure section is hoisted to connect the main beam of the cable-stayed bridge with the main beam of the continuous beam bridge (e.g., the non-cable-stayed bridge). Figure 11 (as shown);

[0087] (20) After the main beam of the cable-stayed bridge and the main beam of the continuous beam bridge 130 of the non-cable-stayed bridge are joined together, the pier 40 and the abutment 30 of the cable-stayed bridge are connected. That is, grouting filler is injected into the gap between the pier 40 and the abutment 30 of the cable-stayed bridge. After curing, the pier 40 and the abutment 30 are connected as one.

[0088] In this invention, the rotation system can assist old and dangerous cable-stayed bridges in straight rotation. Before rotation, the pier 40 is disconnected from the abutment 30. The rotation structure can drive the support leg 80, pier 40, main beam and tower column 60 to rotate. This rotation system maintains the original stress distribution of the main beam to the greatest extent. The original stress points of the main beam have not changed, so that the main beam of old and dangerous bridges will not have safety hazards due to changes in stress during the subsequent straight rotation process.

[0089] In this invention, the rotation system can assist the newly built cable-stayed bridge in a straight rotation. Before the rotation, the pier body 40 and the abutment 30 are disconnected. The rotation structure can drive the support leg 80, the pier body 40 and the main beam to rotate.

[0090] In this invention, by setting up a horizontal rotation support 120, the main beam of the cable-stayed bridge after horizontal rotation can be supported to bear the weight of the upper part of the cable-stayed bridge, which facilitates the cutting and simultaneous dismantling of the main beam and the dismantling of the tower column 60, greatly accelerating the dismantling speed of the old bridge. When building a new cable-stayed bridge, the main beam of the cable-stayed bridge, the tower column 60 and the cable stay 70 can also be built on the horizontal rotation support 120. After most of the work of the cable-stayed bridge is completed on the horizontal rotation support 120, the bridge can be horizontally rotated and connected with the non-cable-stayed continuous beam bridge 130. The construction difficulty is greatly reduced and the construction speed is greatly improved.

[0091] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for dismantling and rebuilding a cable-stayed bridge, characterized in that, Including The method for dismantling the bridge includes the following steps: (1) Erect a horizontal rotation support (120); A horizontal rotation support (120) is erected on both sides of the pier (40) of the cable-stayed bridge. The horizontal rotation support (120) is parallel to the waterway and perpendicular to the main beam of the cable-stayed bridge. (2) A rotating system is erected on the pier (30) of the cable-stayed bridge. The rotating system includes a rotating structure set on the top surface of the pier (30) and support feet (80) set on the rotating structure. The rotating structure is set around the outer ring of the pier body (40). At least one pair of support feet (80) is provided on the rotating structure. The pair of support feet (80) are symmetrically arranged facing each other. The bottom of the support feet (80) rests on the rotating structure and can rotate relative to the rotating structure. The support feet (80) are fixedly connected to the pier body (40). (3) A side span dismantling support (150) is erected under the main beam of the non-cable-stayed bridge section connected to the cable-stayed bridge. The side span dismantling support (150) is set on both sides of the cable-stayed bridge. (4) Symmetrically remove the cable stays (70) on the outer side of the cable-stayed bridge; symmetrically remove the closure section of the cable-stayed bridge; (5) Cut the connection between the cable-stayed bridge pier body (40) and the abutment (30) in a circular cut; (6) A cable-stayed bridge that rotates horizontally via a rotation system; (7) The main beam of the cable-stayed bridge stops after rotating above the horizontal rotation support (120), and the horizontal rotation support (120) moves up and is lifted below the main beam of the cable-stayed bridge; (8) Remove all cable stays (70); dismantle tower columns in sections (60); cut the main beams, first dismantle the main beams at the top of the piers of the cable-stayed bridge (50), and then dismantle the remaining main beams of the cable-stayed bridge; (9) Remove the cable-stayed bridge piers (40); (10) Remove the side span support (150); The reconstruction method includes the following steps: (11) A rotating system is installed on the existing cable-stayed bridge pier (30). First, a rotating structure is built on the pier (30), and then a pair of symmetrically arranged support legs (80) are built on the rotating structure. (12) Construct the cable-stayed bridge pier (40) on the abutment (30) of the cable-stayed bridge. The side of the pier (40) is fixedly connected to the support foot (80) and the pier (40) is not connected to the abutment (30), and there is a gap between the two. (13) Install the main beam (50) on the pier body (40) of the cable-stayed bridge; (14) Install the lower tower columns of the cable-stayed bridge in segments; install the main beam (51) of the continuous beam of the cable-stayed bridge in segments on the horizontal rotation support (120); install the upper tower columns of the cable-stayed bridge; (15) Install the cable stays (70) of the cable-stayed bridge; (16) The cable-stayed bridge is rotated horizontally by the rotation system to complete the horizontal rotation of the cable-stayed bridge.

2. The method for dismantling and rebuilding a cable-stayed bridge according to claim 1, characterized in that, In step (1), a pier cofferdam (20) is constructed around the abutment (30) of the cable-stayed bridge.

3. The method for dismantling and rebuilding a cable-stayed bridge according to claim 1, characterized in that, In step (6), before the cable-stayed bridge is rotated using the rotation system, the main beam of the cable-stayed bridge needs to be counterweighted.

4. The method for dismantling and rebuilding a cable-stayed bridge according to claim 1, characterized in that, The support foot (80) in the rotation system is an arc-shaped structure. The inner side of the support foot (80) wraps around the outer wall of the pier body (40) and fits against the pier body (40) and is fixedly connected to the pier body (40).

5. A method for dismantling and rebuilding a cable-stayed bridge according to claim 1, characterized in that, The rotating structure includes an annular slide (90) and a rotating traction system (110), with the base of the support foot (80) resting on the annular slide (90).

6. The method for dismantling and rebuilding a cable-stayed bridge according to claim 1, characterized in that, In steps (2) and (11), when setting up the rotation system, multiple limiting guide walls (100) must be set on the support platform (30) of the outer ring of the rotation structure.

7. A method for dismantling and rebuilding a cable-stayed bridge according to claim 1, characterized in that, The reconstruction method also includes the following steps: (17) After the cable-stayed bridge completes its rotation, the pier (40) and the abutment (30) of the cable-stayed bridge are connected. That is, grout is injected into the gap between the pier (40) and the abutment (30) of the cable-stayed bridge. After solidification, the pier (40) and the abutment (30) are connected as one.

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