Method for dismantling a multi-span double-curved arch bridge

Abstract

The application discloses a kind of multi-span double-curvature arch bridge demolition methods, it is related to bridge technical field, the method comprises the following steps: step S10, according to arch bridge actual structure parameter establishes arch bridge equivalent model;Step S20, longitudinal striping, transverse symmetry is used to simulate the demolition arch bridge equivalent model, and the maximum stress of arch rib of main arch ring in the demolition process is checked, to determine the number and width of actual arch bridge longitudinal striping;Step S30, according to the number and width determined, longitudinal striping, transverse symmetry is used to demolish actual arch bridge.The application creatively proposes longitudinal striping, transverse symmetry demolition mode, and the maximum stress in the demolition process is checked by simulating the demolition arch bridge equivalent model, which can reduce the collapse risk in the actual demolition process.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a method for dismantling a multi-span hyperbolic arch bridge. Background Art

[0002] Arch bridges are commonly used in urban and scenic areas due to their elegant appearance and stable structure. Under the vertical load of the bridge deck, the arch structure generates not only vertical reaction forces but also horizontal thrusts on the supports on both sides of the main arch ring. This horizontal thrust generates axial pressure within the arch, significantly reducing the cross-sectional bending moment of the arch ring, making it an eccentrically compressed member. The stress distribution across the arch cross section is more uniform than that of a bending beam.

[0003] With the increase in domestic traffic volume in recent years and the improvement of infrastructure functions and construction standards, many arch bridges built in the early days cannot meet current usage needs due to their low design standards and have various defects caused by their long years of use. Therefore, these old arch bridges need to be demolished and rebuilt.

[0004] Arch bridges have poor deformation resistance and strong overall force bearing capacity. Each structure is "interlocking" and shares the load in the system. Any carelessness during the demolition process may cause a collapse accident, and all of them are instantaneous chain collapses, which poses a high safety risk. Summary of the Invention

[0005] An embodiment of the present invention provides a method for dismantling a multi-span hyperbolic arch bridge to solve the technical problem in the related art that there is a risk of collapse during the dismantling of the existing multi-span hyperbolic arch bridge.

[0006] An embodiment of the present invention provides a method for dismantling a multi-span hyperbolic arch bridge, comprising the following steps:

[0007] Establish an equivalent model of the arch bridge based on the actual structural parameters of the arch bridge;

[0008] The demolition of an equivalent arch bridge model was simulated using a longitudinal striping and transverse symmetry approach. The maximum stress in the arch ribs of the main arch ring during the demolition process was verified to determine the number and width of the longitudinal strips of the actual arch bridge.

[0009] According to the determined number of strips and width, the actual arch bridge is dismantled in a longitudinal strip-by-strip and transversely symmetrical manner.

[0010] In some embodiments, the steps of simulating the demolition of an equivalent arch bridge model by longitudinal striping and transverse symmetry, calculating the maximum stress of the arch ribs of the main arch ring during the demolition process, and determining the number and width of the actual longitudinal strips of the arch bridge include:

[0011] The arch bridge equivalent model is divided into strips longitudinally according to the preset number and width. The demolition of the arch bridge equivalent model is simulated in a transversely symmetrical manner. The maximum stress of the arch ribs of the main arch ring during the demolition process is calculated to determine whether it is within the preset stress range:

[0012] If so, the preset number and width of strips are used as the actual number and width of longitudinal strips of the arch bridge;

[0013] If not, adjust the preset number and width until the calculated maximum stress of the arch ribs of the main arch ring during the demolition process is within the preset stress range, and then use the currently adjusted number and width demolition parameters as the actual number and width of the longitudinal strips of the arch bridge.

[0014] In some embodiments, the step of dismantling the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0015] According to the determined number and width of strips, the actual arch bridge's deck pavement, solid web section, web arch ring and main arch ring are dismantled in sequence in a longitudinal strip and transverse symmetrical manner.

[0016] In some embodiments, the step of removing the actual arch bridge deck pavement in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0017] Divide the bridge deck pavement on each opening of the arch bridge into strips longitudinally according to the determined number and width of strips;

[0018] From the middle of the arch bridge to both sides of the arch bridge, first remove the strips of bridge deck pavement on each hole symmetrically upstream and downstream, and then remove the remaining strips of bridge deck pavement in the middle of each hole.

[0019] In some embodiments, the step of first symmetrically removing the strips of bridge deck pavement on each hole upstream and downstream from the middle of the arch bridge to both sides of the arch bridge, and then removing the remaining strips of bridge deck pavement in the middle of each hole, includes:

[0020] Use a hydraulic wire saw to cut and remove the bridge deck pavement.

[0021] In some embodiments, the step of removing the solid web section of the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0022] The solid web sections on each hole of the arch bridge are divided into strips longitudinally according to the determined number and width of strips;

[0023] From both sides of the arch bridge to the middle of the arch bridge, first remove the solid web sections of the strips on each hole symmetrically upstream and downstream, and then remove the remaining solid web sections of the strips in the middle of each hole.

[0024] In some embodiments, the step of removing the web arch ring of the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0025] The web arch rings on each hole of the arch bridge are divided into strips longitudinally according to the determined number and width;

[0026] From both sides of the arch bridge to the middle of the arch bridge, first remove the strip-shaped belly arch rings on each hole symmetrically upstream and downstream, and then remove the remaining strip-shaped belly arch rings in the middle of each hole.

[0027] In some embodiments, the step of removing the main arch ring of the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0028] The main arch rings on each opening of the arch bridge are divided into strips longitudinally according to the determined number and width of strips;

[0029] From both sides of the arch bridge to the middle of the arch bridge, first remove the main arch rings on each hole symmetrically upstream and downstream, and then remove the remaining main arch rings in the middle of each hole.

[0030] In some embodiments, before the step of dismantling the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width, the method includes:

[0031] A plurality of air bags are laid out in a longitudinal and horizontal arrangement on the water surface below each hole of the arch bridge;

[0032] Set up steel legs on both sides of each air bag;

[0033] Set the platform steel beams on the steel legs;

[0034] Lay multiple rubber tires on the platform steel beams;

[0035] Steel plates are laid on multiple rubber tires to form an airbag platform on the water.

[0036] In some embodiments, before the step of dismantling the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width, the method further includes:

[0037] Comb-tooth reinforcement frames are used to reinforce the main arch rings of the actual arch bridge.

[0038] The beneficial effects brought about by the technical solution provided by the present invention include:

[0039] An embodiment of the present invention provides a method for dismantling a multi-span hyperbolic arch bridge. First, an equivalent model of the arch bridge is established based on the actual structural parameters of the arch bridge. Then, a longitudinal striping and transverse symmetric method is used to simulate the dismantling of the equivalent model of the arch bridge, and the maximum stress of the arch ribs of the main arch ring during the dismantling process is verified to determine the number and width of the longitudinal strips of the actual arch bridge. Finally, based on the number and width determined by the verification results, the actual arch bridge is dismantled using a longitudinal striping and transverse symmetric method. The present invention creatively proposes a longitudinal striping and transverse symmetric demolition method, and by simulating the demolition of the equivalent model of the arch bridge and verifying the maximum stress during the demolition process, the risk of collapse during the actual demolition process can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A flow chart of a method for dismantling a multi-span hyperbolic arch bridge provided by an embodiment of the present invention;

[0042] Figure 2 A first schematic diagram of implementing step 30 provided in an embodiment of the present invention;

[0043] Figure 3 The embodiment of the present invention provides Figure 2 A top view of

[0044] Figure 4 A second schematic diagram of implementing step 30 provided in an embodiment of the present invention;

[0045] Figure 5 A third schematic diagram of implementing step 30 provided in an embodiment of the present invention;

[0046] Figure 6 A fourth schematic diagram of implementing step 30 provided in an embodiment of the present invention;

[0047] Figure 7 A fifth schematic diagram of implementing step 30 provided in an embodiment of the present invention;

[0048] Figure 8 A schematic diagram of an aquatic airbag platform provided in an embodiment of the present invention;

[0049] Figure 9 The embodiment of the present invention provides Figure 8 A top view of

[0050] Figure 10 A schematic diagram of a comb-teeth reinforced rack provided in an embodiment of the present invention;

[0051] In the picture:

[0052] 1. Arch bridge; 11. Bridge deck pavement; 12. Solid web section; 13. Web arch ring; 14. Main arch ring; 141. Arch plate; 142. Arch wave; 143. Arch rib; 15. Pier;

[0053] 2. Water airbag platform; 21. Airbag; 22. Steel legs; 23. Platform steel beam; 24. Rubber tire; 25. Steel plate;

[0054] 3. Comb teeth reinforcement rack; 31. Frame steel crossbeam; 32. Channel steel comb teeth. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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 making creative efforts shall fall within the scope of protection of the present invention.

[0056] An embodiment of the present invention provides a method for dismantling a multi-span hyperbolic arch bridge, which can solve the technical problem of the risk of collapse of existing multi-span hyperbolic arch bridges during the dismantling process.

[0057] See also Figure 1 As shown, an embodiment of the present invention provides a method for dismantling a multi-span hyperbolic arch bridge, comprising the following steps:

[0058] Step S10: Establishing an equivalent model of the arch bridge based on the actual structural parameters of the arch bridge. Specifically, the actual structure of the arch bridge can be measured by an instrument, and the relevant structural parameters can be imported into finite element analysis software to establish the equivalent model of the arch bridge.

[0059] Step S20 , simulating the demolition of an equivalent model of an arch bridge by adopting a longitudinal striping and transverse symmetry method, and verifying the maximum stress of the arch ribs of the main arch ring during the demolition process to determine the number and width of the actual longitudinal striping of the arch bridge.

[0060] Specifically, the steps of simulating the demolition of an equivalent model of an arch bridge by adopting a longitudinal striping and transverse symmetry method, and calculating the maximum stress of the arch ribs of the main arch ring during the demolition process, and determining the number and width of the longitudinal strips of the actual arch bridge include:

[0061] The arch bridge equivalent model is divided into strips longitudinally according to the preset number and width. The demolition of the arch bridge equivalent model is simulated in a transversely symmetrical manner. The maximum stress of the arch ribs of the main arch ring during the demolition process is calculated to determine whether it is within the preset stress range:

[0062] If so, the preset number and width of strips are used as the actual number and width of longitudinal strips of the arch bridge;

[0063] If not, adjust the preset number and width until the calculated maximum stress of the arch ribs of the main arch ring during the demolition process is within the preset stress range, and then use the currently adjusted number and width demolition parameters as the actual number and width of the longitudinal strips of the arch bridge.

[0064] For example, in the finite element software, the arch bridge equivalent model is divided into three strips longitudinally according to the preset number and width. The width of the upstream and downstream strips of the arch bridge equivalent model is D1, and the width of the middle strip is D2. The demolition of the arch bridge equivalent model is simulated in a transversely symmetrical manner. That is, the upstream and downstream strip structures of the arch bridge equivalent model are first symmetrically demolished, and then the middle strip structure of the arch bridge equivalent model is demolished. During the demolition process, the maximum stress of the arch rib of the main arch ring is calculated to be within the preset stress range:

[0065] If so, the number of strips is three and the widths are D1 and D2 as the actual number and width of the longitudinal strips of the arch bridge.

[0066] If not, adjust the preset number and width of strips, for example, to five strips and widths of D3, D4, and D5 (the widths of the upstream and downstream strips of the arch bridge equivalent model are D3 and D4, and the width of the middle strip is D5) or to three strips and widths of D1' and D2', and perform repeated calculations until the maximum stress of the arch ribs of the main arch ring during the calculated demolition process is within the preset stress range, and then use the currently adjusted number and width demolition parameters as the number and width of the actual longitudinal strips of the arch bridge.

[0067] The method for calculating whether the maximum stress of the arch rib of the main arch ring during demolition is within the preset stress range is as follows:

[0068] Assume that the maximum vehicle load during the bridge passage process is F. When this load is applied, the horizontal stress of the arch ribs of the main arch ring of the arch bridge is σ1. The horizontal stress of the arch ribs of the main arch ring in the natural state of the arch bridge is σ2. The additional stress difference generated by F is σ1-σ2=[σ]. Determine whether the maximum stress of the arch ribs of the main arch ring during the demolition process is less than [σ]. If so, it means that the maximum stress of the arch ribs of the main arch ring is within the preset stress range; otherwise, the maximum stress of the arch ribs of the main arch ring is not within the preset stress range.

[0069] Step S30: dismantling the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width.

[0070] Specifically, assuming that the arch bridge equivalent model is divided into three strips longitudinally, where the width of the upstream and downstream strips of the arch bridge equivalent model is D1, and the width of the middle strip is D2, the maximum stress of the arch rib can be ensured to be within the preset stress range. Then, the actual arch bridge is divided into three strips longitudinally, where the width of the upstream and downstream strips of the arch bridge equivalent model is D1, and the width of the middle strip is D2. The actual arch bridge is dismantled in a transversely symmetrical manner. By dismantling in a transversely symmetrical manner, the unbalanced force can be minimized.

[0071] The method for dismantling a multi-span hyperbolic arch bridge in an embodiment of the present invention first establishes an equivalent model of the arch bridge based on the actual structural parameters of the arch bridge; then, a longitudinal striping and transverse symmetric method is used to simulate the dismantling of the equivalent model of the arch bridge, and the maximum stress of the arch ribs of the main arch ring during the dismantling process is verified to determine the number and width of the longitudinal strips of the actual arch bridge; finally, based on the number and width determined by the verification results, the actual arch bridge is dismantled using a longitudinal striping and transverse symmetric method. The present invention creatively proposes a longitudinal striping and transverse symmetric demolition method, and by simulating the demolition of the equivalent model of the arch bridge and verifying the maximum stress during the demolition process, it can reduce the risk of collapse during the actual demolition process.

[0072] As an optional implementation, in one embodiment of the invention, the step of dismantling the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0073] According to the determined number of strips and width, the bridge deck pavement 11, the solid web section 12, the web arch ring 13 and the main arch ring 14 of the actual arch bridge 1 are dismantled in sequence in a longitudinal strip-by-strip and transversely symmetrical manner.

[0074] Further, see Figure 2 and Figure 3 As shown, the step of removing the bridge deck pavement 11 of the actual arch bridge 1 in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0075] The bridge deck pavement 11 on each hole of the arch bridge 1 is divided into strips longitudinally according to the determined number and width. Figure 2 As shown, the bridge deck pavement 11 on each hole of the arch bridge 1 is longitudinally divided into three strips, wherein the width of the upstream and downstream strips of the bridge deck pavement 11 is D1, and the width of the middle strip is D2.

[0076] From the middle of the arch bridge 1 to both sides of the arch bridge 1, first remove the strips of bridge deck paving 11 on each hole symmetrically upstream and downstream, and then remove the remaining strips of bridge deck paving 11 in the middle of each hole. Figure 2 and Figure 3 As shown, starting from the center of arch bridge 1 and moving toward both sides, the bridge deck pavement 11 with a width of D1 is first removed symmetrically upstream and downstream from each opening. The remaining bridge deck pavement 11 with a width of D2 in the center of each opening is then removed. Furthermore, when removing the bridge deck pavement 11, the guardrails on each opening can be removed symmetrically upstream and downstream, in the same direction as the bridge deck pavement 11.

[0077] Alternatively, a hydraulic wire saw can be used to remove the bridge deck pavement. This method minimizes disturbance to the bridge during construction, preventing the butterfly effect of local instability leading to overall bridge collapse. Furthermore, the hydraulic wire saw's guide wheels allow it to cut components at any angle, allowing operators to stay away from the components being cut, effectively ensuring personal safety.

[0078] Further, see Figure 4 As shown, the step of dismantling the solid web section 12 of the actual arch bridge 1 in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0079] The solid web sections 12 on each hole of the arch bridge 1 are divided into strips longitudinally according to the determined number and width.

[0080] From both sides of the arch bridge 1 to the middle of the arch bridge 1, first remove the strip-shaped solid web sections 12 on each hole symmetrically upstream and downstream, and then remove the remaining strip-shaped solid web sections 12 in the middle of each hole.

[0081] Further, see Figure 5 As shown, the step of removing the web arch ring 13 of the actual arch bridge 1 in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0082] The web arch rings 13 on each hole of the arch bridge 1 are longitudinally divided into strips according to the determined number and width;

[0083] From both sides of the arch bridge 1 to the middle of the arch bridge 1, first remove the strip-shaped belly arch rings 13 on each hole symmetrically upstream and downstream, and then remove the remaining strip-shaped belly arch rings 13 in the middle of each hole.

[0084] Further, see Figure 6 As shown, the step of dismantling the main arch ring 14 of the actual arch bridge 1 in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width includes:

[0085] The main arch ring 14 on each hole of the arch bridge 1 is divided into strips longitudinally according to the determined number and width;

[0086] From both sides of the arch bridge 1 to the middle of the arch bridge 1, first remove the strip-shaped main arch rings 14 on each hole symmetrically upstream and downstream, and then remove the remaining strip-shaped main arch rings 14 in the middle of each hole.

[0087] Specifically, see Figure 6 and Figure 10 As shown, the arch plate 141 and arch wave 142 of the upstream main arch ring 14 are removed, the arch rib 143 of the upstream main arch ring 14 is broken by machine chiseling, and then the arch plate 141 and arch wave 142 of the downstream main arch ring 14 are removed, and the arch rib 143 of the downstream main arch ring 14 is broken. Figure 7 As shown, the last pier 15 and abutment can be removed by direct crushing.

[0088] As an optional implementation, in one embodiment of the invention, see Figure 2 、 Figure 8 and Figure 9As shown, before the step of dismantling the actual arch bridge in a longitudinally divided and transversely symmetrical manner according to the determined number of strips and width, the method includes:

[0089] Multiple airbags 21 are laid horizontally and longitudinally on the water surface beneath each arch bridge 1. Steel legs 22 are installed on either side of each airbag 21. A platform steel beam 23 is mounted on the steel legs 22. Multiple rubber tires 24 are placed on the platform steel beam 23. Steel plates 25 are placed on the rubber tires 24, forming the floating airbag platform 2. Optionally, the airbags 21 are Φ2×9m, 25t natural rubber-reinforced fiber airbags, with a total buoyancy greater than the total weight of the arch bridge's single-arch structure. The steel plates 25 are at least 8mm thick. The floating airbag platform 2 can be used to prevent workers from drowning and to receive debris from the arch during demolition, effectively turning water into land. This prevents waste debris and concrete blocks from the arch structure from falling into the river channel and reduces the difficulty of subsequent river desilting. Additionally, anchors are installed upstream and downstream to secure the floating airbag platform 2 and prevent it from capsizing.

[0090] As an optional implementation, in one embodiment of the invention, see Figure 10 As shown, before the step of dismantling the actual arch bridge in a longitudinally striped and transversely symmetrical manner according to the determined number of strips and width, the method further includes:

[0091] Comb-tooth reinforcement bents 3 are used to reinforce each main arch ring 14 of the actual arch bridge 1. Specifically, the comb-tooth reinforcement bents 3 comprise a steel crossbeam 31 and multiple channel steel comb teeth 32 mounted on the crossbeam 31. The channel steel comb teeth 32 are inserted into the joints between the arch ribs and the arch corrugations and secured with bolts. Optionally, comb-tooth reinforcement bents can be installed at the 1 / 4, crown, and 3 / 4 positions of each main arch ring to enhance the integrity of the single-span arch ribs during unloading.

[0092] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0093] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0094] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is to be construed in the widest possible manner consistent with the principles and novel features of the present invention.

Claims

1. A method for dismantling a multi-span hyperbolic arch bridge, characterized in that: The following steps are involved: Establish an equivalent model of the arch bridge based on the actual structural parameters of the arch bridge; The demolition of an equivalent arch bridge model was simulated using a longitudinal striping and transverse symmetry approach. The maximum stress in the arch ribs of the main arch ring during the demolition process was verified to determine the number and width of the longitudinal strips of the actual arch bridge. According to the determined number and width of strips, the actual arch bridge is dismantled in a longitudinal strip-by-strip and transversely symmetrical manner; The steps of simulating the demolition of an equivalent model of an arch bridge by adopting a longitudinal striping and transverse symmetry method, and verifying the maximum stress of the arch ribs of the main arch ring during the demolition process, and determining the number and width of the longitudinal strips of the actual arch bridge include: The arch bridge equivalent model is divided into strips longitudinally according to the preset number and width. The demolition of the arch bridge equivalent model is simulated in a transversely symmetrical manner. The maximum stress of the arch ribs of the main arch ring during the demolition process is calculated to determine whether it is within the preset stress range: If so, the preset number and width of strips are used as the actual number and width of longitudinal strips of the arch bridge; If not, adjust the preset number and width until the calculated maximum stress of the arch ribs of the main arch ring during the demolition process is within the preset stress range, and then use the currently adjusted number and width demolition parameters as the actual number and width of the longitudinal strips of the arch bridge.

2. The method for dismantling a multi-span hyperbolic arch bridge according to claim 1, characterized in that: The step of dismantling the actual arch bridge in a longitudinally divided and transversely symmetrical manner according to the determined number of strips and width includes: According to the determined number of strips and width, the bridge deck pavement (11), the solid web section (12), the web arch ring (13) and the main arch ring (14) of the actual arch bridge (1) are sequentially removed in a longitudinal strip-by-strip and transversely symmetrical manner.

3. The method for dismantling a multi-span hyperbolic arch bridge according to claim 2, characterized in that: The step of removing the bridge deck pavement (11) of the actual arch bridge (1) in a longitudinally divided and transversely symmetrical manner according to the determined number of strips and width comprises: The bridge deck pavement (11) on each hole of the arch bridge (1) is longitudinally divided into strips according to the determined number and width of strips; From the middle of the arch bridge (1) to both sides of the arch bridge (1), first remove the strip-shaped bridge deck pavement (11) on each hole symmetrically upstream and downstream, and then remove the remaining strip-shaped bridge deck pavement (11) in the middle of each hole.

4. The method for dismantling a multi-span hyperbolic arch bridge according to claim 3, characterized in that: The steps of first symmetrically removing the strip-shaped bridge deck pavement (11) on each hole from the middle of the arch bridge (1) to both sides of the arch bridge (1) upstream and downstream, and then removing the remaining strip-shaped bridge deck pavement (11) in the middle of each hole, include: The bridge deck pavement was removed using a hydraulic wire saw (11).

5. The method for dismantling a multi-span hyperbolic arch bridge according to claim 2, characterized in that: The step of dismantling the solid web section (12) of the actual arch bridge (1) in a longitudinally divided and transversely symmetrical manner according to the determined number of strips and width comprises: The solid web sections (12) on each hole of the arch bridge (1) are longitudinally divided into strips according to the determined number and width; From both sides of the arch bridge (1) to the middle of the arch bridge (1), first remove the strip-shaped solid web sections (12) on each hole symmetrically upstream and downstream, and then remove the remaining strip-shaped solid web sections (12) in the middle of each hole.

6. The method for dismantling a multi-span hyperbolic arch bridge according to claim 2, characterized in that: The step of removing the arch ring (13) of the actual arch bridge (1) in a longitudinally divided and transversely symmetrical manner according to the determined number of strips and width comprises: The web arch rings (13) on each hole of the arch bridge (1) are longitudinally divided into strips according to the determined number and width; From both sides of the arch bridge (1) to the middle of the arch bridge (1), first remove the strip-shaped belly arch rings (13) on each hole symmetrically upstream and downstream, and then remove the remaining strip-shaped belly arch rings (13) in the middle of each hole.

7. The method for dismantling a multi-span hyperbolic arch bridge according to claim 2, characterized in that: The step of dismantling the main arch ring (14) of the actual arch bridge (1) in a longitudinally divided and transversely symmetrical manner according to the determined number of strips and width comprises: The main arch ring (14) on each hole of the arch bridge (1) is longitudinally divided into strips according to the determined number and width of strips; From both sides of the arch bridge (1) to the middle of the arch bridge (1), first remove the strip-shaped main arch rings (14) on each hole symmetrically upstream and downstream, and then remove the remaining strip-shaped main arch rings (14) in the middle of each hole.

8. The method for dismantling a multi-span hyperbolic arch bridge according to claim 1, characterized in that: Before the step of dismantling the actual arch bridge in a longitudinally divided and transversely symmetrical manner according to the determined number of strips and width, the method includes: A plurality of air bags (21) are arranged longitudinally and horizontally on the water surface below each hole of the arch bridge (1); Steel legs (22) are installed on both sides of each air bag (21); A platform steel beam (23) is provided on the steel legs (22); Laying a plurality of rubber tires (24) on the platform steel beams (23); A steel plate (25) is laid on a plurality of rubber tires (24) to form an airbag platform (2) on water.

9. The method for dismantling a multi-span hyperbolic arch bridge according to claim 1, characterized in that: Before the step of dismantling the actual arch bridge in a longitudinally divided and transversely symmetrical manner according to the determined number of strips and width, the method further includes: Comb-teeth reinforcement bents (3) are used to reinforce each main arch ring (14) of the actual arch bridge (1).

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