A fully prefabricated and assembled bridge and its construction method

Abstract

The present invention provides a fully prefabricated and assembled bridge, characterized in that: from top to bottom, the bridge successively includes main girders, cap beams, bridge piers, pile caps, and pile foundations, all of which are constructed by means of factory prefabrication and on-site assembly. Among them, the main girders and the cap beams are connected by bearings, and the cap beams and the bridge piers are connected by a connecting device composed of cap beam embedded steel plates, cap beam cast steel parts, pier top column surface sliding plates, pier top cast steel parts, pier top embedded steel plates, pier top steel bars, and pier top nuts. The bridge piers and the pile caps are connected by a connecting device composed of pile cap embedded parts, pier bottom embedded parts, pier bottom steel bars, and pier bottom nuts. The pile caps and the pile foundations are connected by bearings. The present invention has clear force transmission and convenient construction, realizes the full prefabrication, assembly, construction, and demolition of the bridge structure, and can be widely applied to the rapid construction and demolition projects of bridges.

Description

Technical Field

[0001] The present invention relates to a bridge structure type, in particular to a fully prefabricated and assembled bridge. Background Art

[0002] When building bridges in areas with heavy traffic, harsh natural conditions, or strict environmental protection requirements, it is necessary to compress the construction period as much as possible while ensuring safety and quality. Therefore, the technology of rapid bridge construction has emerged.

[0003] Prefabrication and assembly is an important branch of the technology of rapid bridge construction. Its technical core is to transfer as much on-site construction time as possible to factory construction. Ideally, transporting the entire bridge structure manufactured in the factory to the site can complete the rapid construction of the bridge. However, due to the large size and complex connection of the bridge structure, it is difficult to achieve overall transportation. Therefore, prefabrication and assembly at the component level is more feasible. Bridge components can be divided into superstructure, substructure, and foundation from top to bottom. At present, the prefabrication and assembly of the superstructure are relatively mature, the research on the prefabrication and assembly of the substructure is in full swing, and the foundation still basically adopts cast-in-situ construction. To minimize on-site construction time, the engineering community has put forward the concept of fully prefabricated and assembled bridges, that is, all bridge components are constructed by factory prefabrication and on-site assembly. The concept of fully prefabricated and assembled bridges fully meets the goal of rapid bridge construction, but the key issue lies in the treatment of the connection methods of each component. How to achieve efficient and fast connection of bridge components is worthy of in-depth study.

[0004] In summary, the key to solving the construction of fully prefabricated and assembled bridges lies in handling the connections between components. Therefore, it is necessary to develop a set of applicable connection methods. Summary of the Invention

[0005] In view of the good application prospects of the concept of fully prefabricated and assembled bridges, starting from the perspective of deconstructing the connection methods between bridge components, the present invention discloses a fully prefabricated and assembled bridge, which can minimize on-site construction time and is widely applicable to the rapid construction of bridges.

[0006] To solve the above technical problems, the technical solution adopted in this application is as follows:

[0007] A fully prefabricated and assembled bridge, the bridge successively includes a main beam, a capping beam, a pier, a pile cap, and a pile foundation from top to bottom; the main beam and the capping beam are connected by a connecting device A, the capping beam and the pier are connected by a connecting device B, the pier and the pile cap are connected by a connecting device C, and the pile cap and the pile foundation are connected by a connecting device D;

[0008] The connecting device A and the connecting device D adopt a plate rubber bearing, a pot bearing, a spherical bearing, or a seismic isolation bearing;

[0009] The connecting device B includes a capping beam embedded steel plate, a capping beam cast steel piece, a pier top column surface slide plate, a pier top cast steel piece, a pier top embedded steel plate, a pier top steel bar and a pier top nut. The capping beam embedded steel plate is embedded in the bottom surface of the capping beam and is connected to the capping beam by welding steel bars or bolts. The capping beam cast steel piece is welded or cast integrally with the capping beam embedded steel plate. The pier top column surface slide plate is fixed on the concave surface of the capping beam cast steel piece. The pier top cast steel piece is welded or cast integrally with the pier top embedded steel plate. The pier top embedded steel plate is embedded in the top surface of the pier and is welded to the main reinforcement of the pier. The pier top cast steel piece has a convex surface adapted to the concave surface of the capping beam cast steel piece, and the convex surface is placed in the concave surface. After the pier top steel bar passes through the capping beam cast steel piece and the pier top cast steel piece, it is fixed by the pier top nut;

[0010] The connecting device C includes a bearing platform embedded part, a pier bottom embedded part, a pier bottom steel bar and a pier bottom nut. The bearing platform embedded part with a ring-shaped convex part is embedded in the top surface of the bearing platform and is connected to the bearing platform by welding steel bars or bolts. The pier bottom embedded part with a cylindrical convex part is embedded in the bottom surface of the pier and is welded to the main reinforcement and stirrups of the pier. The cylindrical convex part is fitted in the groove formed by the convex part. When the pier is a circular pier, after the pier bottom steel bar passes through the convex part of the bearing platform embedded part and is screwed into the reserved hole of the pier bottom embedded part, it is fixed by the pier bottom nut. When the pier is a rectangular pier, after the pier bottom steel bar passes through the bearing platform embedded part and the pier bottom embedded part, it is fixed by the pier bottom nut.

[0011] Further, at least two rows of pile foundations are arranged in the longitudinal and transverse directions of the bridge structure at each pier position, and at least two piers are arranged in the transverse direction at each pier position.

[0012] Further, the main beam, capping beam, pier, bearing platform and pile foundation are all constructed by the method of factory prefabrication and on-site assembly.

[0013] Further, the pier can be prefabricated in segments, and the connecting device C is used to connect between the segments.

[0014] Further, the concave arc surface of the pier top column surface slide plate fits with the concave arc surface of the capping beam cast steel piece. The concave arc surface of the pier top column surface slide plate, the convex arc surface of the pier top cast steel piece and the concave arc surface of the pier top column surface slide plate are all concentric cylindrical surface structures and can rotate around the axis of the pier top steel bar.

[0015] Further, both ends of the pier top steel bar and the pier bottom steel bar, and the reserved hole of the pier bottom embedded part of the circular pier are all processed by tapping.

[0016] On the other hand, the present application also includes a construction method of a fully prefabricated and assembled bridge as described in any one of the foregoing, including the following steps:

[0017] Step 1: Fabricate the main girders, bent caps, bridge piers, pile caps, and pile foundations at the prefabrication plant and transport them to the construction site. Among them, the pile cap and connecting device D, and the pile cap embedded parts are prefabricated as a whole; the bridge pier, the pier bottom embedded parts, the pier top cast steel parts, and the pier top embedded steel plates are prefabricated as a whole; the bent cap, the bent cap embedded steel plates, the bent cap cast steel parts, and the pier top column surface slides are prefabricated as a whole; the main girder and connecting device A are prefabricated as a whole;

[0018] Step 2: Lift and install the pile foundations and drive or press them into the foundation;

[0019] Step 3: Lift and install the pile cap, align the connecting device D with the anchor bolt holes at the top of the pile foundation, install bolts, and complete the connection between the pile cap and the pile foundation;

[0020] Step 4: Lift and install the bridge pier, place the pier bottom embedded parts on the pile cap embedded parts, insert the pier bottom steel bars, and tighten the pier bottom nuts to complete the connection between the bridge pier and the pile cap;

[0021] Step 5: Lift and install the bent cap, place the pier top column surface slides on the pier top cast steel parts, insert the pier top steel bars, and tighten the pier top nuts to complete the connection between the bent cap and the bridge pier;

[0022] Step 6: Lift and install the main girder, align the connecting device A with the anchor bolt holes at the top of the bent cap, install bolts, and complete the connection between the main girder and the bent cap;

[0023] Step 7: Construct the bridge deck system to complete the construction of the fully prefabricated and assembled bridge.

[0024] On the other hand, the present application also includes a demolition method for a fully prefabricated and assembled bridge as described in any one of the foregoing. The bridge can be separated between components by cutting the connections, thereby realizing the demolition of the entire bridge or the replacement of local components. The separation method includes: cutting the bolts at the position of the anchor bolt holes at the top of the bent cap and the connecting device A to separate the main girder from the bent cap; unscrewing the pier top nuts, pulling out the pier top steel bars, and cutting off the protruding parts at both ends of the bent cap cast steel parts to separate the bent cap from the bridge pier; unscrewing the pier bottom nuts, pulling out the pier bottom steel bars, and cutting off the protruding parts of the pile cap embedded parts to separate the bridge pier from the pile cap; cutting the bolts at the position of the anchor bolt holes at the top of the pile foundation and the connecting device D to separate the pile cap from the pile foundation.

[0025] Different from the common joint treatment methods, the present invention realizes zero in-situ casting and replaceable plastic hinges. The force transmission between components is clear, the construction is convenient, and the full prefabrication, assembly, construction, and demolition of the bridge structure are realized, which can be widely applied to the rapid construction and demolition projects of bridges. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a transverse layout diagram of a fully prefabricated and assembled bridge.

[0028] Figure 2 It is a longitudinal layout diagram of a fully prefabricated and assembled bridge.

[0029] Figure 3 It is a transverse layout diagram of the cap-beam - pier node of a fully prefabricated and assembled bridge.

[0030] Figure 4 It is a longitudinal layout diagram of the cap-beam - pier node of a fully prefabricated and assembled bridge.

[0031] Figure 5 It is a bottom view of the cap-beam - pier node of a fully prefabricated and assembled bridge.

[0032] Figure 6 It is a top view (circular pier) of the cap-beam - pier node of a fully prefabricated and assembled bridge.

[0033] Figure 7 It is a top view (rectangular pier) of the cap-beam - pier node of a fully prefabricated and assembled bridge.

[0034] Figure 8 It is an elevation layout diagram (circular pier) of the pier - pile cap node of a fully prefabricated and assembled bridge.

[0035] Figure 9 It is a bottom view (circular pier) of the pier - pile cap node of a fully prefabricated and assembled bridge.

[0036] Figure 10 It is a top view (circular pier) of the pier - pile cap node of a fully prefabricated and assembled bridge.

[0037] Figure 11 It is a transverse layout diagram (rectangular pier) of the pier - pile cap node of a fully prefabricated and assembled bridge.

[0038] Figure 12 It is a longitudinal layout diagram (rectangular pier) of the pier - pile cap node of a fully prefabricated and assembled bridge.

[0039] Figure 13 It is a bottom view (rectangular pier) of the pier - pile cap node of a fully prefabricated and assembled bridge.

[0040] Figure 14 A top view of the pier-cap joint of a fully prefabricated assembled bridge (rectangular pier). DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Beam bridges are the most widely used bridge type, characterized by simple structure, clear force transmission, and mature construction. A typical beam bridge consists of, from top to bottom, the main beam, cap beam, piers, abutment, and pile foundation. Bearings connect the main beam to the cap beam, while consolidation is employed between the cap beam and piers, the piers and abutment, and the abutment and pile foundation. For fully prefabricated assembly, the connections between each component must be released during prefabrication and restored during assembly. As can be seen, with the exception of the main beam to cap beam connection, all other connections fail to meet these requirements, necessitating deconstruction of the consolidation nodes. For bridges with multiple piers in the transverse direction, the longitudinal rotational constraints between the cap beam and piers, or between the piers and abutment, can be relaxed, with transverse translational and vertical constraints fulfilling their functions. For bridges with multiple pile foundations in both the longitudinal and transverse directions, the three rotational constraints between the abutment and pile foundation can be relaxed, with three translational constraints fulfilling their functions. Therefore, considering the two states of component connection (unconstrained during prefabrication and constrained after assembly), mechanical properties similar to those of cast-in-place structures can be achieved by disassembling the degrees of freedom. In summary, from the perspective of overall degree of freedom matching, a connection method for fully prefabricated assembled bridges is proposed.

[0043] The present invention is further achieved through the following technical solutions:

[0044] A fully prefabricated and assembled bridge of the present invention is characterized in that: the bridge successively comprises a main beam 1, a capping beam 2, a pier 3, a pile cap 4, and a pile foundation 5 from top to bottom; a connecting device A12 is used to connect the main beam 1 and the capping beam 2, a connecting device B23 is used to connect the capping beam 2 and the pier 3, a connecting device C34 is used to connect the pier 3 and the pile cap 4, and a connecting device D45 is used to connect the pile cap 4 and the pile foundation 5; the connecting device A12 and the connecting device D45 can both adopt one of a plate rubber bearing, a pot bearing, a spherical bearing, a seismic isolation and vibration reduction bearing, and other types of bridge bearings; the connecting device B23 is composed of a capping beam embedded steel plate 231, a capping beam cast steel part 232, a pier top column surface slide plate 233, a pier top cast steel part 234, a pier top embedded steel plate 235, a pier top steel bar 236, and a pier top nut 237. The capping beam embedded steel plate 231 is embedded in the bottom surface of the capping beam 2 and is connected to the capping beam 2 by welding steel bars or bolts. The capping beam cast steel part 232 is welded or cast integrally with the capping beam embedded steel plate 231. The pier top column surface slide plate 233 is pasted on the concave surface of the capping beam cast steel part 232. The pier top cast steel part 234 is welded or cast integrally with the pier top embedded steel plate 235. The pier top embedded steel plate 235 is embedded in the top surface of the pier 3 and is welded to the main reinforcement of the pier The pier top steel bar 236 passes through the capping beam cast steel part 232 and the pier top cast steel part 234 and is fixed by the pier top nut 237; the connecting device C34 is composed of a pile cap embedded part 341, a pier bottom embedded part 342, a pier bottom steel bar 343, and a pier bottom nut 344. The pile cap embedded part 341 is embedded in the top surface of the pile cap 4 and is connected to the pile cap 4 by welding steel bars or bolts. The pier bottom embedded part 342 is embedded in the bottom surface of the pier 3 and is welded to the main reinforcement and stirrups of the pier. When the pier 3 is a circular pier, the pier bottom steel bar 343 passes through the protruding part of the pile cap embedded part 341 and is screwed into the reserved hole of the pier bottom embedded part 342 and then fixed by the pier bottom nut 344. When the pier 3 is a rectangular pier, the pier bottom steel bar 343 passes through the pile cap embedded part 341 and the pier bottom embedded part 342 and is fixed by the pier bottom nut 344.

[0045] In this embodiment, at least two rows of pile foundations 5 are arranged in the longitudinal and transverse directions of the bridge structure at each pier position, and at least two piers 3 are arranged in the transverse direction at each pier position.

[0046] In this embodiment, the main beam 1, the capping beam 2, the pier 3, the pile cap 4, and the pile foundation 5 are all constructed by the method of factory prefabrication and on-site assembly.

[0047] In this embodiment, the pier 3 can be prefabricated in sections, and the connecting device C34 is used to connect between the sections.

[0048] In this embodiment, the arc surfaces of the capping beam steel castings 232, the arc surfaces of the pier top column surface slides 233, and the arc surfaces of the pier top steel castings 234 are all concentric cylindrical surface structures and can rotate around the axis of the pier top steel bar 236.

[0049] In this embodiment, both ends of the pier top steel bar 236 and the pier bottom steel bar 343, as well as the reserved holes of the pier bottom embedded parts 342 of the circular pier, are processed by tapping.

[0050] In this embodiment, a construction method for a fully prefabricated and assembled bridge includes the following steps:

[0051] Step 1: Fabricate the main beam 1, capping beam 2, pier 3, pile cap 4, and pile foundation 5 in the prefabrication plant and transport them to the construction site. Among them, the pile cap 4, the connecting device D45, and the pile cap embedded parts 341 are prefabricated as a whole; the pier 3, the pier bottom embedded parts 342, the pier top steel castings 234, and the pier top embedded steel plates 235 are prefabricated as a whole; the capping beam 2, the capping beam embedded steel plates 231, the capping beam steel castings 232, and the pier top column surface slides 233 are prefabricated as a whole; and the main beam 1 and the connecting device A12 are prefabricated as a whole.

[0052] Step 2: Hoist the pile foundation 5 and drive or press it into the foundation.

[0053] Step 3: Hoist the pile cap 4, align the connecting device D45 with the anchor bolt holes at the top of the pile foundation 5, install bolts, and complete the connection between the pile cap 4 and the pile foundation 5.

[0054] Step 4: Hoist the pier 3, place the pier bottom embedded parts 342 on the pile cap embedded parts 341, insert the pier bottom steel bar 343, and tighten the pier bottom nuts 344 to complete the connection between the pier 3 and the pile cap 4.

[0055] Step 5: Hoist the capping beam 2, place the pier top column surface slides 233 on the pier top steel castings 234, insert the pier top steel bar 236, and tighten the pier top nuts 237 to complete the connection between the capping beam 2 and the pier 3.

[0056] Step 6: Hoist the main beam 1, align the connecting device A12 with the anchor bolt holes at the top of the capping beam 2, install bolts, and complete the connection between the main beam 1 and the capping beam 2.

[0057] Step 7: Construct the bridge deck system to complete the construction of the fully prefabricated and assembled bridge.

[0058] In this embodiment, a method for demolishing a fully prefabricated assembled bridge is characterized in that the bridge can be separated between components by cutting off the connection, thereby realizing the demolition of the whole bridge or the replacement of local components. The separation method includes: cutting off the bolts at the position of the bolt holes at the top of the cap beam 2 of the connecting device A12 to separate the main beam 1 from the cap beam 2; screwing out the pier top nut 237, pulling out the pier top steel bar 236, and cutting off the protruding parts at both ends of the cap beam cast steel part 232 to separate the cap beam 2 from the pier 3; screwing out the pier bottom nut 344, pulling out the pier bottom steel bar 343, and cutting off the protruding part of the embedded part 341 of the bearing platform to separate the pier 3 from the bearing platform 4; cutting off the bolts at the position of the bolt holes at the top of the pile foundation 5 of the connecting device D45 to separate the bearing platform 4 from the pile foundation 5.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fully prefabricated and assembled bridge, characterized in that: The bridge from top to bottom successively includes a main beam (1), a capping beam (2), a pier (3), a pile cap (4), and pile foundations (5); a connecting device A (12) is used to connect the main beam (1) and the capping beam (2), a connecting device B (23) is used to connect the capping beam (2) and the pier (3), a connecting device C (34) is used to connect the pier (3) and the pile cap (4), and a connecting device D (45) is used to connect the pile cap (4) and the pile foundations (5); The connecting device A (12) and the connecting device D (45) adopt a plate rubber bearing or a pot - type bearing or a spherical bearing or a seismic isolation and vibration reduction bearing; The connecting device B (23) includes a capping beam embedded steel plate (231), a capping beam cast steel part (232), a pier top column - surface sliding plate (233), a pier top cast steel part (234), a pier top embedded steel plate (235), a pier top steel bar (236), and a pier top nut (237). The capping beam embedded steel plate (231) is embedded in the bottom surface of the capping beam (2) and is connected to the capping beam (2) by welding steel bars or bolts. The capping beam cast steel part (232) is welded or cast integrally with the capping beam embedded steel plate (231). The pier top column - surface sliding plate (233) is fixed on the concave surface of the capping beam cast steel part (232). The pier top cast steel part (234) is welded or cast integrally with the pier top embedded steel plate (235). The pier top embedded steel plate (235) is embedded in the top surface of the pier (3) and is welded to the main reinforcement of the pier (3). The pier top cast steel part (234) has a convex surface adapted to the concave surface of the capping beam cast steel part (232), and the convex surface is placed in the concave surface. After the pier top steel bar (236) passes through the capping beam cast steel part (232) and the pier top cast steel part (234), it is fixed by the pier top nut (237); The connecting device C (34) includes a pile cap embedded part (341), a pier bottom embedded part (342), a pier bottom steel bar (343), and a pier bottom nut (344). The pile cap embedded part (341) with an annular convex part is embedded in the top surface of the pile cap (4) and is connected to the pile cap (4) by welding steel bars or bolts. The pier bottom embedded part (342) with a cylindrical convex part is embedded in the bottom surface of the pier (3) and is welded to the main reinforcement and stirrups of the pier (3). The cylindrical convex part is fitted into the groove formed by the convex part. When the pier (3) is a circular pier, after the pier bottom steel bar (343) passes through the convex part of the pile cap embedded part (341) and is screwed into the reserved hole of the pier bottom embedded part (342), it is fixed by the pier bottom nut (344). When the pier (3) is a rectangular pier, after the pier bottom steel bar (343) passes through the pile cap embedded part (341) and the pier bottom embedded part (342), it is fixed by the pier bottom nut (344).

2. The all-precast and assembled bridge according to claim 1, wherein: The bridge structure is provided with at least two rows of pile foundations (5) in the longitudinal and transverse directions at each pier position, and at least two piers (3) are provided in the transverse direction at each pier position.

3. The prefabricated assembled bridge according to claim 1, wherein: The main beam (1), the capping beam (2), the pier (3), the pile cap (4), and the pile foundations (5) are all constructed by the method of factory pre - fabrication and on - site assembly.

4. A fully prefabricated and assembled bridge according to claim 1, wherein: The bridge pier (3) is precast in segments, and a connecting device C (34) is used to connect between the segments.

5. A fully prefabricated and assembled bridge according to claim 1, characterized in that: The concave arc surface of the pier top column surface slide plate (233) fits with the concave arc surface of the capping beam cast steel part (232). The concave arc surface of the pier top column surface slide plate (233), the convex arc surface of the pier top cast steel part (234), and the concave arc surface of the pier top column surface slide plate (233) are all concentric cylindrical surface structures and can rotate around the axis of the pier top steel bar (236).

6. A fully prefabricated and assembled bridge according to claim 1, characterized in that: Thread tapping treatment is performed on both ends of the pier top steel bar (236) and the pier bottom steel bar (343), as well as the reserved holes of the pier bottom embedded parts (342) of the circular bridge pier.

7. A construction method for a fully prefabricated and assembled bridge according to any one of claims 1-6, characterized in that, It includes the following steps: Step 1: Fabricate the main beam (1), capping beam (2), bridge pier (3), bearing platform (4), and pile foundation (5) in the prefabrication factory and transport them to the construction site. Among them, the bearing platform (4) is precast integrally with the connecting device D (45) and the bearing platform embedded parts (341), the bridge pier (3) is precast integrally with the pier bottom embedded parts (342), the pier top cast steel part (234), and the pier top embedded steel plate (235), the capping beam (2) is precast integrally with the capping beam embedded steel plate (231), the capping beam cast steel part (232), and the pier top column surface slide plate (233), and the main beam (1) is precast integrally with the connecting device A (12); Step 2: Hoist the pile foundation (5) and drive or press it into the foundation; Step 3: Hoist the bearing platform (4), align the connecting device D (45) with the anchor bolt holes at the top of the pile foundation (5), install bolts, and complete the connection between the bearing platform (4) and the pile foundation (5); Step 4: Hoist the bridge pier (3), place the pier bottom embedded parts (342) on the bearing platform embedded parts (341), insert the pier bottom steel bar (343), and tighten the pier bottom nuts (344) to complete the connection between the bridge pier (3) and the bearing platform (4); Step 5: Hoist the capping beam (2), place the pier top column surface slide plate (233) on the pier top cast steel part (234), insert the pier top steel bar (236), and tighten the pier top nuts (237) to complete the connection between the capping beam (2) and the bridge pier (3); Step 6: Hoist the main beam (1), align the connecting device A (12) with the anchor bolt holes at the top of the capping beam (2), install bolts, and complete the connection between the main beam (1) and the capping beam (2); Step 7: Construct the bridge deck system to complete the construction of the fully prefabricated and assembled bridge.

8. A demolition method for a fully prefabricated and assembled bridge according to any one of claims 1-6, characterized in that, The bridge can achieve the separation between components by cutting the connections, thereby realizing the demolition of the entire bridge or the replacement of local components. The separation method includes: cutting the bolts at the position of the anchor bolt holes at the top of the capping beam (2) and the connecting device A (12) to separate the main beam (1) from the capping beam (2); unscrewing the pier top nuts (237), pulling out the pier top steel bar (236), and cutting the protruding parts at both ends of the capping beam cast steel part (232) to separate the capping beam (2) from the bridge pier (3); unscrewing the pier bottom nuts (344), pulling out the pier bottom steel bar (343), and cutting the protruding parts of the bearing platform embedded parts (341) to separate the bridge pier (3) from the bearing platform (4); cutting the bolts at the position of the anchor bolt holes at the top of the connecting device D (45) and the pile foundation (5) to separate the bearing platform (4) from the pile foundation (5).

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