Construction method for quickly demolishing structure of overpass

Abstract

The application relates to a construction method of a rapid dismantling structure of a overpass, which comprises the following steps: determining the cutting positions of the bridge and the positions of the cutting positioning devices; installing a shaped protective fence structure and traffic guide; laying a road surface protection structure under the bridge; installing a bearing inclined arch leg bottom support frame; assembling a bearing inclined arch leg cutting and dismantling isolation protection support frame; installing a protective suspension frame; installing a half-width road closure steel support structure; erecting a bridge jacking preloading support structure and completing the conversion of the beam structure form; installing a crash barrier cutting and dismantling support frame and a crash barrier cutting and stable support frame; installing a crash barrier cutting guide frame; arranging a mobile support support structure; dismantling a reinforced concrete crash barrier; arranging a first removal plate lifting and dismantling device; cutting and lifting the first removal plate; dismantling the bearing arch leg; and dismantling and transporting the main beam and the abutment. The application improves the dismantling construction efficiency and ensures the construction safety, reduces the influence on the environment and the traffic, and has the advantages of short construction period, small influence on the traffic, high safety and the like.

Description

Technical Field

[0001] This invention relates to a construction method for the rapid demolition of overpass structures, belonging to the field of civil engineering, and is applicable to the rapid demolition of overpasses. Background Technology

[0002] Before demolishing an overpass, a thorough investigation and assessment of the bridge structure, traffic conditions, and surrounding environment is essential. A detailed structural evaluation is necessary to identify key load-bearing components and potential weaknesses. This requires comprehensive inspection and analysis by structural engineers and a specialized team to ensure the demolition process does not compromise the bridge's stability or the safety of the surrounding environment. The impact of demolition on surrounding traffic must be assessed, and a reasonable traffic management plan should be developed to ensure smooth traffic flow and minimize disruption to nearby residents and businesses. The potential environmental impacts, such as noise, vibration, and dust, must be assessed, and corresponding environmental protection measures should be implemented to minimize disturbance to the surrounding environment. A detailed demolition plan must be developed, including the equipment to be used, the demolition sequence, and safety measures. The safety and efficiency of the demolition process must be ensured. Necessary safety facilities must be set up at the demolition site to ensure the safety of workers and surrounding residents. This may include fencing, warning signs, and safety equipment. The demolition should be carried out according to the plan, using specialized equipment and techniques to gradually dismantle the bridge structure. During this process, special care must be taken to avoid structural collapse and excessive impact on the surrounding environment.

[0003] The completion of the road surface protection structure under the overpass demolition requires a rigorous safety risk assessment, which is the core of the overpass demolition process. During demolition, continuous monitoring of structural changes is necessary to ensure the safety of the project. Simultaneously, contingency plans must be developed to address potential emergencies such as structural instability or accidents. To mitigate risks and ensure the safety of staff and the public, strict safety measures and training programs must be implemented. Regular inspections and evaluations of the project progress are essential to ensure the demolition process is conducted safely and systematically.

[0004] Overpass demolition technology encompasses multiple aspects, including structural assessment and planning, traffic management and environmental protection, safety risk assessment, and emergency response. The proper implementation of these steps and measures is crucial to ensuring the safe and smooth progress of the demolition project. Therefore, achieving rapid and safe demolition of overpasses is of paramount importance, representing a key technology in on-site construction and a major challenge in the entire project. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for the rapid demolition of overpass structures, which improves demolition efficiency and ensures construction safety, reduces the impact on the environment and traffic, and has the advantages of short construction period, minimal impact on traffic, and high safety, resulting in good economic benefits.

[0006] To achieve the above-mentioned objectives, the present invention can be accomplished through the following method: a construction method for rapid demolition of an overpass structure, comprising the following steps:

[0007] S00. Determine the location of each cutting section of the bridge and the cutting positioning device:

[0008] Based on the drawings, the cutting positions of the arch foot, abutment, diagonal brace, and bridge deck, as well as the positions of the slabs to be removed first, are determined by calculation. The layout of the cutting guide frame base and the position of the anchor bars are also determined.

[0009] S01. Installation of standardized protective fencing structure and traffic diversion:

[0010] A standardized protective barrier for the demolition of the substructure is erected on one half of the road surface on one side of the central divider, and traffic diversion openings are excavated in the central divider below both sides of the bridge deck; the standardized protective barrier for the demolition of the substructure is set at the traffic diversion opening.

[0011] S02. Laying the protective structure for the road surface under the bridge:

[0012] Unit quick-assembly steel plate channels are assembled on the road surface on both sides of the central divider. Multiple steel plate channels with support slots and steel plate channels with hanging plates are connected in series and then connected with the side channel plates to form a unit-integrated bridge under-bridge road surface protection structure.

[0013] Sand or granular material is laid in the reserved trench, and all demolition and mobile operation platforms move on the road surface protection structure under the bridge.

[0014] S03. Install the bottom support frame for the load-bearing inclined arch leg:

[0015] Assemble the bottom support frame of the load-bearing inclined arch leg on the road surface at the arch foot, and adjust the lifting rod to the designated position so that the arch foot support plate is supported on the bottom of the inclined brace of the arch foot, and the top line of the arch foot support plate matches the bottom structure of the inclined brace linearly.

[0016] S04. Removal and dismantling of the isolation and protection supports for the assembled load-bearing inclined arch legs:

[0017] On the road surface below the bottom of the diagonal brace, the load-bearing diagonal arch leg is assembled by chiseling away and removing the isolation and protection bracket. The support rod is adjusted to the designated position so that the support plate is supported above the bottom of the diagonal brace, and the top line of the support plate matches the bottom structure of the diagonal brace linearly.

[0018] S05. Install protective suspension brackets:

[0019] Install a protective suspension frame on the road surface between the isolation and protection brackets of the load-bearing inclined arch leg and the support frame at the bottom of the load-bearing inclined arch leg;

[0020] S06. Install half-width road closure steel support structure:

[0021] A half-width road closure steel support structure was erected on the road surface at the central median and on both sides;

[0022] S07. Erect the bridge jacking and prestressing support structure and complete the beam structure conversion:

[0023] The longitudinal beams are anchored to the beam body below the bridge deck by pre-embedded anchor bolts under the solid web plate. After adjusting the jacks to lift the solid web plate to the designated position, the longitudinal beams and transverse beams are welded together. Then the inclined arch legs of the arch foot are removed to convert the inclined leg rigid frame bridge structure into a continuous beam bridge.

[0024] S08. Install the crash barrier cutting and removal bracket and the crash barrier cutting and stabilizing bracket:

[0025] After the bridge structure conversion is completed, the second support column will be hoisted with the help of the bridge jacking and preloading support structure. The anti-collision barrier cutting and dismantling support will be installed under the bridge deck, and the anti-collision barrier cutting and stabilizing support will be installed on the bottom plate of the cutting and dismantling support.

[0026] S09. Install the crash barrier cutting guide frame:

[0027] Install a crash barrier cutting guide frame on the top center of the bridge deck, and set up a winch. Install the plug-in rod on the suspension plate, and then hang the second positioning plate.

[0028] S10. Deploy the movable support structure:

[0029] A mobile support structure was erected using the bridge jacking preloading support structure and the installation of crash barriers and the cutting and dismantling of the support structure.

[0030] S11. Remove reinforced concrete crash barriers:

[0031] First, hang the inverted L-shaped stabilizing plate on the top of the reinforced concrete crash barrier. Then, adjust the telescopic rod to the designated position so that the second positioning plate is located at the cutting line. Align the second positioning plate with the determined position and then use a static cutting machine to cut the reinforced concrete crash barrier. At the same time, use a water storage tank for dust suppression spraying and a wastewater collection tank for wastewater sedimentation. Then, use a drainage pipe to transport the water to the water storage tank to achieve wastewater reuse.

[0032] Then, the guide frame base is slid by a winch, thereby removing the reinforced concrete crash barriers at different locations.

[0033] S12. Deploy the pre-removal plate lifting and dismantling device:

[0034] A preliminary removal plate is installed on the top of the bridge abutment to lift the removal device. At the same time, a fixing frame is welded to the top of the anchor bar, and multiple rows of connecting rods and the first positioning plate are welded to the side of the fixing frame.

[0035] S13. Cutting and hoisting the panels that have been removed first:

[0036] Align the first positioning plate with the position determined by the static cutting machine to cut off the plate to be removed first. Then adjust the lifting rod to the designated position, and then use binding wire rope and suspension wire rope to lift the cut plate to the designated position.

[0037] S14. Remove the load-bearing arch legs:

[0038] A crane was used to erect a cutting platform for the arch legs.

[0039] After the first slabs were removed, the space left at the bridge deck was used to set up the arch foot cutting construction platform. The arch foot cutting construction platform was then hoisted to the top of the arch foot using suspension steel wire ropes.

[0040] The diagonal bracing is removed using a static cutting machine. At the same time, the diagonal bracing of the steel plate joint and the cast-in-place wet joint is removed using a static cutting machine on the operating platform, and then hoisted to the designated location.

[0041] S15. Dismantling and transporting main beams and abutments:

[0042] The bottom support frame and protective suspension frame of the load-bearing inclined arch leg are removed. Then, the bridge deck is dismantled and transported as a whole by sliding the support structure using a movable support. Finally, the abutment is dismantled.

[0043] Further, the specific steps of step S05 are as follows: connect the concrete base of the support, the fixed base and the protective net base through the U-shaped plug, and then hang the protective net on the suspension wire rope hanging pole.

[0044] Further, the specific steps of step S06 are as follows: pouring a steel pipe column fixing base on the road surface, installing multiple rows of steel pipe columns on the top of the steel pipe column fixing base, and installing a crossbeam on the top of the steel pipe columns.

[0045] Further, the specific steps of step S10 are: pouring the steel pipe column base on the road surface and installing the steel pipe column;

[0046] Install a steel plate platform on top of the steel pipe column, hang wastewater collection tanks on both sides of the steel plate platform, install a lifting jack on top of the steel plate platform, and connect the jack extension rod to the sleeve.

[0047] Adjust the jack extension rod to the designated position so that the U-shaped support groove is supported under the main beam. At the same time, install water storage tanks and protective nets on both sides of the U-shaped support groove.

[0048] This invention has the following outstanding advantages and significant effects:

[0049] 1. The modular quick-assembly steel plate channel of the present invention is ingeniously designed, enabling rapid assembly and disassembly, which greatly improves the efficiency of assembly and construction. At the same time, the sand or granular material set on the top effectively reduces the impact of the vehicle equipment on the road surface.

[0050] 2. The bridge abutment load-bearing arch leg removal structure adopted in this invention uses load-bearing inclined arch leg chiseling removal isolation protection bracket and protective suspension frame, which improves the demolition construction efficiency and ensures construction safety, and reduces the impact on the environment and traffic.

[0051] 3. This invention adopts a bridge jacking pre-stressing support structure and a half-width road closure steel support structure to convert the inclined leg rigid frame bridge structure into a continuous beam, avoiding problems such as overall bridge instability and tilting that are easily caused by direct block cutting, and ensuring construction safety after the removal of the corbels; it adopts standardized protective barriers for the removal of the substructure, and uses the bridge demolition sequence to control and divert traffic on the highway, ensuring smooth traffic under the bridge.

[0052] 4. The cross-bridge mobile support dismantling structure of this invention greatly reduces the difficulty of static cutting and traffic diversion during dismantling construction, and has good social and economic benefits.

[0053] 5. The cross-bridge reinforced concrete crash barrier cutting and dismantling support structure of the present invention has the advantages of short construction period, small impact on traffic, and high safety, and has good economic benefits and broad application prospects. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the construction of the moving support structure for the overpass.

[0055] Figure 2 This is a three-dimensional schematic diagram of the quick-assembly steel plate channel connection.

[0056] Figure 3 This is a schematic diagram of the connection plan of the unit quick-assembly steel plate channel;

[0057] Figure 4 It is a three-dimensional schematic diagram of a steel plate trough structure with hanging plates;

[0058] Figure 5 It is a three-dimensional schematic diagram of a steel plate trough with a support groove;

[0059] Figure 6 It is a three-dimensional schematic diagram of a steel plate trough structure with a support groove;

[0060] Figure 7 It is a schematic diagram of a steel plate trough structure with a support groove;

[0061] Figure 8 This is a schematic diagram of the assembly of the road surface protection structure under the overpass after demolition;

[0062] Figure 9 This is a schematic diagram of the construction of the bridge abutment load-bearing arch leg demolition structure;

[0063] Figure 10 This is a schematic diagram of the construction process for dismantling the load-bearing arch leg of the bridge abutment;

[0064] Figure 11 This is a detailed schematic diagram of the connection between the protective suspension bracket and the fixed base;

[0065] Figure 12 This is a detailed schematic diagram of the connection between the protective suspension frame and the concrete base of the support;

[0066] Figure 13 This is a three-dimensional schematic diagram of the bridge jacking prestressing support structure;

[0067] Figure 14 This is a schematic diagram of the elevation of the steel support structure for half of the road closure;

[0068] Figure 15 This is a schematic diagram of the overall cutting, hoisting, and dismantling construction of the overpass.

[0069] Figure 16 This is a schematic diagram of the standardized protective fencing for the demolition of the lower structure and traffic diversion.

[0070] Figure 17 This is a diagram of the standardized protective fencing structure for the demolition of the lower structure;

[0071] Figure 18 This is a three-dimensional construction schematic diagram of the mobile support structure;

[0072] Figure 19 This is a three-dimensional construction diagram of the water tank and wastewater collection tank for static cutting.

[0073] Figure 20 This is a schematic diagram of the elevation construction of the mobile scaffold support structure;

[0074] Figure 21 This is a front construction diagram of the mobile support structure;

[0075] Figure 22 This is a three-dimensional schematic diagram of the support structure for cutting and dismantling the reinforced concrete crash barrier of the overpass;

[0076] Figure 23 This is a 3D schematic diagram of the installation of the crash barrier cutting and stabilizing bracket and the crash barrier cutting guide frame;

[0077] Figure 24 This is a schematic diagram of the elevation of the support structure for cutting and dismantling the reinforced concrete crash barrier of the overpass;

[0078] Figure 25 This is a 3D schematic diagram of the detailed structure of the anti-collision barrier's cutting and stabilizing support frame;

[0079] Figure 26 This is a 3D schematic diagram of the detailed structure of the guide frame for cutting the crash barrier.

[0080] In the diagram: 1. Arch foot; 2. Abutment; 3. Diagonal brace; 4. Bridge deck; 5. Steel plate joint; 6. Cast-in-place wet joint; 7. Mobile operating platform; 8. Solid web; 9. Granular material; 10. Sloping arch leg; 11. Chord plate; 12. Abutment foundation; 13. Central divider; 14. Side channel plate; 15. Peg; 16. Steel plate channel with support groove; 17. Steel plate channel with hanging plate; 18. Socket; 19. Inner longitudinal vertical plate; 20. Outer longitudinal vertical plate; 21. Reserved groove; 22. Long vertical plate; 23. L-shaped hanging plate; 24. Outer transverse vertical plate; 25. Support opening; 26. Butt joint; 27. Butt bearing plate; 28. Short vertical plate; 29. ​​Slot; 30. Insertion hole; 31. Road surface; 32. Crane wheel; 33. Crane; 34. 35. Lifting boom; 36. Binding wire rope; 37. Suspension wire rope; 38. First-removed plate; 39. First positioning plate; 40. Connecting rod; 41. Fixing frame; 42. Support plate; 43. Support rod; 44. Operating platform; 45. Guardrail; 46. Jack; 47. Diagonal brace; 48. Support steel pipe; 49. Support diagonal brace; 50. Support horizontal connecting rod; 51. Support concrete base; 52. U-shaped insert rod; 53. Protective net base; 54. Protective net; 55. Suspension wire rope; 56. Arch foot support plate; 57. Fixed base; 58. Lifting rod; 59. Suspension wire rope hanging rod; 60. Lifting jack; 61. Anchor bar; 62. Pre-drilled hole for protective net base; 63. Support concrete base 64. Pre-drilled hole for fixed base; 65. Anchor bolt; 66. Longitudinal beam; 67. Adjusting jack; 68. Bolt and nut; 69. Crossbeam; 70. Diagonal rod; 71. Steel pipe column fixed base; 72. Horizontal brace; 73. Steel pipe column; 74. Enclosure steel plate; 75. Traffic diversion port; 76. Rotatable fastener; 77. Nut; 78. Steel plate pre-drilled hole; 79. Tie rod; 80. Protective netting; 81. Drainage pipe; 82. Insertable pin; 83. Fixed nut; 84. Jack telescopic rod; 85. Hoop; 86. Lifting jack; 87. Wastewater collection tank; 88. First support column; 89. Rotating shaft; 90. Connecting beam; 91. Corbel brace; 92. Roller; 93. W-shaped support; 94. Steel plate platform; 95. L-shaped suspension hook; 96. Vehicle; 97. Cantilever support plate; 98. Insert and pull pin; 99. U-shaped support groove; 100. Water storage tank; 101. Scissor brace; 102. Arch foot cutting construction platform; 103. Fall protection net; 104. Cutting and dismantling bracket base plate; 105. Connecting bar; 106. Vertical strut; 107. Reinforced concrete crash barrier; 108. Inverted L-shaped stabilizing plate; 109. Sliding base; 110. Insert and pull rod; 111. Fan-shaped clamp; 112. Horizontal connecting rod; 113. Suspension plate; 114. Telescopic rod; 115. Steel wire rope; 116. Connecting rod; 117. Upper connecting rod; 118. Diagonal strut; 119. Stabilizing bracket base; 120. Second support column; 121. Traction steel wire rope;122. Cutting guide frame base; 123. Slide rail groove; 124. Winch; 125. Second positioning plate; 126. Bottom connecting rod; 127. Column support rod. Detailed Implementation

[0081] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0082] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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, the above terms should not be construed as limitations on this application.

[0083] The construction technical requirements for steel pipe welding and cutting, rebar cage binding, and concrete pouring in the embodiments of the present invention will not be repeated. The focus is on explaining the implementation of the present invention. The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. This description is not limited to the following embodiments.

[0084] like Figures 1-26 As shown, a construction method for the rapid demolition of an overpass structure includes the following steps:

[0085] S00. Determine the location of each cutting section of the bridge and the cutting positioning device:

[0086] Based on the drawings, the cutting positions of arch foot 1, bridge abutment 2, diagonal brace 3, bridge deck 4 and the position of the slab 38 to be removed first are determined by calculation. The layout position of the cutting guide frame base 122 and the position of the anchor bar 61 are also determined.

[0087] S01. Installation of standardized protective fencing structure and traffic diversion:

[0088] A standardized protective barrier for the demolition of the substructure is erected on one half of the road surface 31 on one side of the central divider 13. Traffic diversion openings 75 are excavated at the central divider 13 below both sides of the bridge deck 4. The standardized protective barrier for the demolition of the substructure is set at the traffic diversion openings 75. This allows traffic to be diverted from one half of the closed road to the other half, thus ensuring uninterrupted traffic during construction.

[0089] S02. Laying the protective structure for the road surface under the bridge:

[0090] Unit quick-assembly steel plate channels are assembled on the road surface 31 on both sides of the central divider 13. Multiple steel plate channels 16 with support slots and steel plate channels 17 with hanging plates are connected in series and then connected with the side channel plate 14 to form a unit integral bridge road surface 31 protection structure.

[0091] Sand or granular material 9 is laid in the reserved groove 21, and all dismantling and mobile operation platforms 7 move on the road surface protection structure under the bridge.

[0092] S03. Install the bottom support frame of the load-bearing inclined arch leg 10:

[0093] Assemble the bottom support frame of the load-bearing inclined arch leg 10 on the road surface 31 at the arch foot 1, and adjust the lifting rod 58 to the designated position so that the arch foot support plate 56 is supported on the bottom of the inclined brace 3 at the arch foot 1, and the top line of the arch foot support plate 56 is linearly matched with the bottom structure of the inclined brace 3.

[0094] S04. Removal and dismantling of the isolation and protection bracket for the assembled load-bearing inclined arch leg 10:

[0095] On the road surface 31 below the bottom of the diagonal brace 3, the load-bearing diagonal arch leg 10 is assembled and the isolation and protection bracket is removed. The support rod 43 is adjusted to the designated position so that the support plate 42 is supported on the bottom of the diagonal brace 3. The top line of the support plate 42 is linearly matched with the bottom structure of the diagonal brace 3.

[0096] S05. Install protective suspension brackets:

[0097] Install a protective suspension frame on the road surface 31 between the isolation and protection bracket of the load-bearing inclined arch leg 10 and the support frame at the bottom of the load-bearing inclined arch leg 10;

[0098] In this embodiment, the concrete base 51 of the support frame, the fixed base 57 and the protective net base 53 are connected by the U-shaped insertion rod 52, and then the protective net 54 is hung on the suspension wire rope hanging rod 59.

[0099] S06. Install half-width road closure steel support structure:

[0100] Half-width road closure steel support structures were erected on the central median strip at point 13 and on the road surface 31 on both sides.

[0101] In this embodiment, a steel pipe column fixing base 71 is poured on the road surface 31, multiple rows of steel pipe columns 73 are installed on the top of the steel pipe column fixing base 71, and a crossbeam 69 is installed on the top of the steel pipe column 73.

[0102] S07. Erect the bridge jacking and prestressing support structure and complete the beam structure transformation:

[0103] The longitudinal beam 66 is anchored to the beam body below the bridge deck 4 by the anchor bolts 65 pre-embedded under the solid web plate 8. After adjusting the jack 67 to lift the solid web plate 8 to the designated position, the longitudinal beam 66 and the transverse beam 69 are welded together. Then the inclined arch leg 10 of the arch foot 1 is removed to realize the conversion of the inclined leg rigid frame bridge structure into a continuous beam bridge, thereby ensuring construction safety.

[0104] S08. Install the crash barrier cutting and removal bracket and the crash barrier cutting and stabilizing bracket:

[0105] After the bridge structure transformation is completed, the second support column 120 is hoisted with the help of the bridge jacking pre-stressing support structure. The anti-collision barrier cutting and dismantling support is installed under the bridge deck 4, and the anti-collision barrier cutting and stabilizing support is installed on the base plate 104 of the cutting and dismantling support.

[0106] S09. Install the crash barrier cutting guide frame:

[0107] Install a crash barrier cutting guide frame on the top center of the bridge deck 4, and set up a winch 124. Install the insertion rod 110 on the suspension plate 113, and then hang the second positioning plate 125.

[0108] S10. Deploy the movable support structure:

[0109] A mobile support structure was erected using the bridge jacking preloading support structure and the installation of crash barriers and the cutting and dismantling of the support structure.

[0110] In this embodiment, the base of the steel pipe column 73 is poured on the road surface 31 and the steel pipe column 73 is installed; a steel plate platform 94 is installed on the top of the steel pipe column 73, and wastewater collection tanks 87 are hung on both sides of the steel plate platform 94. A lifting jack 86 is installed on the top of the steel plate platform 94, and the jack extension rod 84 is connected to the sleeve 85; the jack extension rod 84 is adjusted to the designated position so that the U-shaped support groove 99 is supported under the main beam, and water storage tanks 100 and protective nets 80 are installed on both sides of the U-shaped support groove 99.

[0111] S11. Remove reinforced concrete crash barrier 107:

[0112] First, hang the inverted L-shaped stabilizing plate 108 on the top of the reinforced concrete crash barrier 107. Then, adjust the telescopic rod 114 to the designated position so that the second positioning plate 125 is located at the cutting line position. Align the second positioning plate 125 with the determined position and then use a static cutting machine to cut the reinforced concrete crash barrier 107. At the same time, use the water storage tank 100 to spray and reduce dust, and use the wastewater collection tank 87 to settle the wastewater. Then, use the diversion pipe 81 to transport the water to the water storage tank 100 to achieve wastewater reuse.

[0113] Then, the guide frame base 122 is slid by the winch 124 to achieve the removal of the reinforced concrete crash barrier 107 at different locations;

[0114] S12. Deploy the pre-removal plate lifting and dismantling device:

[0115] A preliminary removal plate is installed on the top of the bridge abutment 2 to lift the removal device. At the same time, a fixing frame 41 is welded on the top of the anchor bar 61, and multiple rows of connecting rods 40 and the first positioning plate 39 are welded on the side of the fixing frame 41.

[0116] S13. Cutting and hoisting the pre-removed panels 38:

[0117] The plate 38 to be removed first is cut off by a static cutting machine at the position determined by the first positioning plate 39. Then the lifting rod 35 is adjusted to the designated position. Then the cut plate 38 is hoisted to the designated position by the binding wire rope 36 and the suspension wire rope 37.

[0118] S14. Remove the load-bearing arch legs:

[0119] A construction platform 102 for cutting the arch legs was erected using crane 33;

[0120] After the first removal of the slab 38, the space left by cutting off the four sections of the bridge deck was used to set up the arch foot cutting construction platform 102. The arch foot cutting construction platform 102 was hoisted to the top of the arch foot 1 using the suspension steel wire rope 37.

[0121] The diagonal brace 3 is cut off using a static cutting machine. At the same time, the diagonal brace 3 of the steel plate joint 5 and the cast-in-place wet joint 6 is cut off using a static cutting machine on the operating platform 44, and then hoisted to the designated position.

[0122] S15. Dismantling and transporting the main beams and abutments 2:

[0123] Remove the bottom support frame and protective suspension frame of the load-bearing inclined arch leg 10, then use the sliding support structure of the movable support to realize the overall removal and transportation of the bridge deck 4, and finally remove the bridge abutment 2.

[0124] The demolition structures mentioned in the above methods specifically include: unit quick-assembly steel plate troughs and quick-filling and recycling granular buffer layer structures; chiseling and demolition isolation and protection supports for load-bearing inclined arch legs 10, bottom support frames for load-bearing inclined arch legs 10, protective suspension frames, lifting and demolition devices for pre-demolition plates, and positioning devices for pre-demolition plates 38; half-width road closure steel support system, bridge jacking pre-stressing support system, and standardized protective barriers for substructure demolition; mobile support system, static cutting water troughs and wastewater collection troughs; crash barrier cutting and demolition supports, crash barrier cutting stabilizing supports, and crash barrier cutting guide frames.

[0125] In this embodiment, the unit quick-assembly steel plate trough includes a side trough plate 14, a steel plate trough 16 with a support groove, and a steel plate trough 17 with a hanging plate. The unit quick-assembly steel plate trough is used to lay on the road surface 31 on both sides of the central divider 13 and to install the mobile operating platform 7. The steel plate trough 16 with the support groove and the steel plate trough 17 with the hanging plate are connected in sequence to form the overall frame of the unit quick-assembly steel plate trough. The outermost steel plate trough 16 with the support groove is connected to the side trough plate 14. The side trough plate 14, the steel plate trough 16 with the support groove, and the steel plate trough 17 with the hanging plate are provided with a reserved groove 21 at the top center. The inner side of the side trough plate 14 and the two sides of the steel plate trough 17 with the hanging plate are respectively provided with L-shaped hanging plates 23. The two sides of the steel plate trough 16 with the support groove are provided with slots 29.

[0126] Preferably, the steel plate groove 17 with hanging plate includes a long vertical plate 22, an L-shaped hanging plate 23, a reserved groove 21, a resting opening 25, and a short vertical plate 28; the long vertical plate 22 is provided with an L-shaped hanging plate 23 on its outer side, and the bottom of the L-shaped hanging plate 23 is provided with evenly distributed pins 15, and an insertion opening 18 is provided between the lower part of the L-shaped hanging plate 23 and the long vertical plate 22 of the steel plate groove 17 with hanging plate; the L-shaped hanging plate 23 is shorter than the long vertical plate 22 of the steel plate groove 17 with hanging plate, so that an interface 26 is formed at the end of the L-shaped hanging plate 23. The steel plate groove 16 with a support slot includes an inner longitudinal vertical plate 19, an outer longitudinal vertical plate 20, a reserved groove 21, an outer transverse vertical plate 24, a support opening 25, a mating support plate 27, a slot 29, and insertion holes 30. The support opening 25 is located on the outer side of the inner longitudinal vertical plate 19, and the mating support plate 27 is located on both sides of the outer transverse vertical plate 24. The outer longitudinal vertical plate 20 is shorter than the mating support plate 27, thus forming the support opening 25 at the top of the outer longitudinal vertical plate 20. The bottom plate of the slot 29 is evenly provided with insertion holes 30. Preferably, the insertion opening 18 mates with the support opening 25, the L-shaped hanging plate 23 rests in the slot 29, the pin 15 is inserted into the insertion hole 30, the two ends of the L-shaped hanging plate 23 abut against the mating support plate 27, and the long vertical plate 22 abuts against the outer side of the inner longitudinal vertical plate 19.

[0127] In this embodiment, the rapid filling and recycling granular buffer layer structure is composed of sand or granular material 9, which is installed in the reserved slots 21 of the side slot plate 14, the steel plate slot 16 with a support slot, and the steel plate slot 17 with a hanging plate.

[0128] In this embodiment, the removal and isolation protection bracket for the load-bearing inclined arch leg 10 is installed on the road surface 31 below the solid web plate 8 of the steel plate joint 5. It includes: support plate 42, support rod 43, operating platform 44, guardrail 45, jack 46, diagonal brace 47, support steel pipe 48, support diagonal brace 49, support horizontal connecting rod 50, and support concrete base 51. The top of the support concrete base 51 is provided with multiple rows of support steel pipe 48, the top of the support steel pipe 48 is provided with the operating platform 44, the top of the operating platform 44 is provided with multiple rows of jacks 46, the jacks 46 are connected to the support rod 43, the support plate 42 is provided above the support rod 43, and the support plate 42 is supported on the bottom of the solid web plate 8.

[0129] Preferably, the support steel pipes 48 are connected by support diagonal braces 49 and support horizontal connecting rods 50, with the support diagonal braces 49 located between the support horizontal connecting rods 50; the outside of the operating platform 44 is provided with guardrails 45, and the bottom of the operating platform 44 is welded to the outside of the support steel pipes 48 by diagonal braces 47.

[0130] In this embodiment, the bottom support frame of the load-bearing inclined arch leg 10 is arranged on the road surface 31 below the inclined arch leg 10, and includes: arch foot support plate 56, fixed base 57, lifting rod 58, and lifting jack 60; the top of the fixed base 57 is provided with multiple rows of lifting jacks 60, the lifting jacks 60 are connected to the lifting rod 58, the top of the lifting rod 58 is provided with arch foot support plate 56, and the arch foot support plate 56 is supported on the bottom of the inclined arch leg 10 at the arch foot 1.

[0131] In this embodiment, the protective suspension frame is installed on the road surface 31 between the demolition and isolation protection bracket of the load-bearing inclined arch leg 10 and the bottom support frame of the load-bearing inclined arch leg 10. It includes: a protective net base 53, a protective net 54, a suspension wire rope 55, and a suspension wire rope hanging rod 59. The top of the protective net base 53 is provided with a suspension wire rope hanging rod 59. The height of the suspension wire rope hanging rods 59 on both sides is determined according to the angle of the inclined arch leg 10. The top of the suspension wire rope hanging rods 59 is hung with a suspension wire rope 55, and the protective net 54 is suspended on the suspension wire rope 55.

[0132] Preferably, the support concrete base 51, the fixed base 57, and the protective net base 53 are connected and fixed by a U-shaped insert 52. Preferably, the top edge of the support concrete base 51 has multiple rows of support concrete base reserved holes 63; the top edge of the fixed base 57 has multiple rows of fixed base reserved holes 64; the top edge of the protective net base 53 has multiple rows of protective net base reserved holes 62; one end of the U-shaped insert 52 is inserted into the protective net base reserved hole 62, and the other end is inserted into the support concrete base reserved hole 63 or the fixed base reserved hole 64.

[0133] In this embodiment, the pre-removal plate lifting and removal device is installed on the top of the bridge abutment 2, which includes: crane wheels 32, crane 33, boom fixing seat 34, lifting boom 35, and suspension wire rope 37; the crane wheels 32 are provided below the crane 33, the boom fixing seat 34 is provided on the top of the crane 33, the lifting boom 35 is provided on the top of the boom fixing seat 34, and the end of the lifting boom 35 is connected to the suspension wire rope 37.

[0134] Preferably, the suspension wire rope 37 is connected to the binding wire rope 36, and the binding wire rope 36 is connected to the plate 38 to be removed first; the plate to be removed first can be lifted away from the demolition device to be used to set up the arch foot cutting construction platform 102 for cutting the arch foot 1, and the suspension wire rope 37 can be used to lift the arch foot cutting construction platform 102.

[0135] In this embodiment, the positioning device for the first-removed plate 38 is arranged near the bridge deck 4 at the top of the diagonal brace 3. It includes: a first positioning plate 39, a connecting rod 40, a fixing frame 41, and an anchor bar 61. The anchor bar 61 is embedded in the top of the bridge deck 4. The top of the anchor bar 61 is connected to the fixing frame 41. Multiple rows of connecting rods 40 are connected to the side of the fixing frame 41. The ends of the connecting rods 40 are connected to the first positioning plate 39. The first positioning plate 39 is located above the end of the first-removed plate 38.

[0136] In this embodiment, the half-width road closure steel support structure is located on the road surface 31 on both sides of the central median 13, including a crossbeam 69, diagonal braces 70, steel pipe column fixing bases 71, cross braces 72, and steel pipe columns 73. Multiple rows of steel pipe columns 73 are provided on the top of the steel pipe column fixing bases 71, and crossbeams 69 are provided on the top of each steel pipe column 73. The steel pipe columns 73 are connected by diagonal braces 70 and cross braces 72, with the diagonal braces 70 positioned between the cross braces 72. Traffic diversion openings 75 are provided on both sides of the bridge jacking preloading support structure in the central median 13, and the standardized protective barriers for the removal of the lower structure are located at the traffic diversion openings 75.

[0137] In this embodiment, the bridge jacking preloading support structure is located at the bottom of the solid web 8 and includes anchor bolts 65, longitudinal beams 66, adjusting jacks 67, and bolts and nuts 68. The anchor bolts 65 are evenly embedded below the solid web 8. The longitudinal beams 66 are anchored to the beam body below the bridge deck 4 by the anchor bolts 65 and are fixed by the anchor bolts 65. The longitudinal beams 66 are located above the ends of the transverse beams 69. The top of the transverse beams 69 is provided with multiple rows of adjusting jacks 67. The adjusting jacks 67 are used to jack the solid web 8 so as to weld the longitudinal beams 66 and the transverse beams 69 to remove the inclined arch legs 10 of the arch foot 1.

[0138] In this embodiment, the lower structure, consisting of a standardized protective barrier removed from the road surface 31 of the central median 13, includes a barrier steel plate 74, rotatable fasteners 76, nuts 77, pre-drilled holes 78 in the steel plate, and tie rods 79. The side of the barrier steel plate 74 has multiple pre-drilled holes 78, and the inner side of the barrier steel plate 74 has rotatable fasteners 76. The barrier steel plates 74 are connected by multiple rows of tie rods 79, temporarily secured by rotatable fasteners 76, and tightened by nuts 77.

[0139] In this embodiment, the movable support structure, used to support the integrally cut bridge deck 4 and solid web 8, includes insert pins 82, fixing nuts 83, jack telescopic rods 84, clamps 85, lifting jacks 86, first support columns 88, rotating shafts 89, connecting beams 90, corbel supports 91, rollers 92, W-shaped supports 93, steel plate platforms 94, insert pins 98, and U-shaped resting grooves 99; the bottom of the U-shaped resting grooves 99 is provided with multiple rows of clamps 85, and the clamps 85 are connected to the jack telescopic rods 84 through insert pins 82 and fixing nuts 83; the jack telescopic rods 84 are connected to the lifting jacks 86, and the lifting jacks 86 are evenly distributed on the top of the steel plate platforms 94, and the bottom of the steel plate platforms 94 is provided with first support columns 88;

[0140] In this embodiment, the bottom of the first support column 88 is provided with a pivot 89, and a roller 92 is connected below the pivot 89; the first support columns 88 are connected to each other in the parallel driving direction by scissor braces 101; the first support columns 88 are connected to each other in the driving direction by a connecting beam 90, a corbel brace 91, and a W-shaped support 93, one end of the corbel brace 91 is connected to the connecting beam 90, and the other end is connected to the first support column 88; the top of the W-shaped support 93 is connected to the bottom of the steel plate platform 94, and the bottom of the W-shaped support 93 is connected to the connecting beam 90.

[0141] Preferably, the U-shaped support groove 99 has a cantilever support plate 97 at its bottom side, and a protective net 80 and a water storage tank 100 at the top of the cantilever support plate 97. The protective net 80 has a plug-in pin 98 at its bottom, which is inserted into a pre-drilled hole at the top edge of the cantilever support plate 97. The movable support structure is located on the road surface 31, and vehicles 96 can pass through it via the connecting beam 90 of the movable support structure.

[0142] The static cutting water tank and wastewater collection tank are used for dust suppression spraying when cutting bridge deck 4 and solid web plate 8. The tank includes a wastewater collection tank 87, a diversion pipe 81, an L-shaped suspension hook 95, and a water storage tank 100. The wastewater collection tank 87 is uniformly provided with L-shaped suspension hooks 95 on the top inner side. The water storage tank 100 is provided with a diversion pipe 81 on the side. The other end of the diversion pipe 81 is inserted into the wastewater collection tank 87.

[0143] In this embodiment, the anti-collision guardrail cutting and demolition support is arranged below the bridge deck 4 and has an anti-collision guardrail cutting and stabilizing support at the top, including a fall prevention net 103, a cutting and demolition support bottom plate 104, and second support columns 120; the fall prevention net 103 is arranged on both sides of the top of the cutting and demolition support bottom plate 104, and multiple rows of second support columns 120 are evenly arranged at the bottom of the cutting and demolition support bottom plate 104.

[0144] In this embodiment, the anti-collision guardrail cutting and stabilizing support is arranged on the cutting and demolition support bottom plate 104 on the side of the reinforced concrete anti-collision guardrail 107 and is used to ensure the stability of the cutting process of the reinforced concrete anti-collision guardrail 107. It includes connecting bars 105, vertical struts 106, inverted L-shaped stabilizing plates 108, connecting rods 116, upper connecting rods 117, diagonal struts 118, a stabilizing support base 119, bottom connecting rods 126, and column struts 127; the side of the inverted L-shaped stabilizing plate 108 is fixed to the stabilizing support base 119 through the upper connecting rod 117 and the bottom connecting rod 126. Multiple rows of vertical struts 106 are arranged in the center of the top of the stabilizing support base 119, and the vertical struts 106 are connected into a unit through the connecting bars 105.

[0145] Preferably, the inverted L-shaped stabilizing plate 108 is sleeved on the top of the reinforced concrete anti-collision guardrail 107. The bottom of the side of the inverted L-shaped stabilizing plate 108 is connected to the center of the side of the stabilizing support base 119 through the bottom connecting rod 126. The stabilizing support base 119 is located on the top of the cutting and demolition support bottom plate 104, and the cutting and demolition support bottom plate 104 supports on the bottom of the bridge deck 4. The bottom of the side of the vertical strut 106 is connected to the top of the side of the inverted L-shaped stabilizing plate 108 through the diagonal strut 118, and the top of the side of the vertical strut 106 is connected to the upper part above the center of the side of the inverted L-shaped stabilizing plate 108 through the upper connecting rod 117. The upper connecting rods 117 are connected into a whole through the connecting rod 116.

[0146] In this embodiment, the anti-collision guardrail cutting guide frame is arranged in the center of the top of the bridge deck 4 and includes vertical struts 106, a sliding base 109, a plugging rod 110, a fan-shaped clamping plate 111, a transverse connecting rod 112, a hanging plate 113, a telescopic rod 114, a cutting guide frame base 122, a slide rail groove 123, a winch 124, and a second positioning plate 125; a slide rail groove 123 is arranged in the center of the top of the cutting guide frame base 122, and the sliding base 109 is placed in the slide rail groove 123. The slide rail groove 123 and the sliding base 109 are in a "middle" shape; multiple rows of vertical struts 106 are arranged on the top of the sliding base 109, and a hanging plate 113 is arranged on the top of the vertical struts 106. Reserved holes for installing the plugging rod 110 are evenly arranged on the top of the hanging plate 113.

[0147] Preferably, the insertion rod 110 has a fan-shaped retaining plate 111 evenly distributed on its outer center. The bottom of the insertion rod 110 passes through a pre-drilled hole in the suspension plate 113, and the fan-shaped retaining plate 111 rests on the suspension plate 113. The insertion rod 110 has a telescopic rod 114 on its side. A steel wire rope 115 is connected to the end of the telescopic rod 114, and a second positioning plate 125 is connected to the bottom of the steel wire rope 115. The second positioning plate 125 is located outside the reinforced concrete crash barrier 107. The second positioning plate 125 can be quickly positioned by adjusting the telescopic rod 114. A winch 124 is provided on the top of the cutting guide frame base 122. The winch 124 is connected to the upper end of the sliding base 109 by a traction steel wire rope 121. The cutting guide frame base 122 can be slid by the traction of the winch 124.

[0148] Among them, the diagonal brace 3, bridge deck 4, steel plate joint 5, cast-in-place wet joint 6, solid web 8, inclined arch leg 10, chord plate 11, abutment foundation 12, central divider 13, and road surface 31 are all part of the abutment to be demolished. The parts not described in detail in this application are prior art, so they are not described in detail in this application.

[0149] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0150] Although this document uses a significant amount of technical terminology, the possibility of using other terms is not excluded. These terms are used merely to facilitate the description and explanation of the nature of this application; interpreting them as any additional limitation would be contrary to the spirit of this application.

[0151] This application is not limited to the above-described preferred embodiments. Anyone can derive other products in various forms under the guidance of this application. However, regardless of any changes made to their shape or structure, any technical solution that is the same as or similar to that of this application falls within the protection scope of this application.

Claims

1. A construction method for the rapid demolition of an overpass structure, characterized in that, Includes the following steps: S00. Determine the location of each cutting section of the bridge and the cutting positioning device: According to the drawings, the cutting positions of the arch foot (1), bridge abutment (2), diagonal brace (3), bridge deck (4) and the position of the first-removed plate (38) are determined by calculation, and the layout position of the cutting guide frame base (122) and the position of the anchor bar (61) are determined; wherein, the anchor bar (61) is pre-embedded in the top of the bridge deck (4). S01. Installation of standardized protective fencing structure and traffic diversion: A standardized protective barrier for the demolition of the substructure is erected on half of the road surface (31) on one side of the central divider (13), and a traffic diversion opening (75) is excavated at the central divider (13) on both sides of the bridge deck (4); wherein, the standardized protective barrier for the demolition of the substructure is set at the traffic diversion opening (75). S02. Laying the protective structure for the road surface under the bridge: Assemble unit quick-assembly steel plate channels on the road surface (31) on both sides of the central divider (13). Connect multiple steel plate channels (16) with support slots and steel plate channels (17) with hanging plates to form a unit integrated bridge under-bridge road surface protection structure. Particles (9) are laid in the reserved grooves (21) at the top of the side groove plate (14), the steel plate groove with the support groove (16) and the steel plate groove with the hanging plate (17), and all dismantling and moving operation platforms (7) walk on the road surface protection structure under the bridge. S03. Install the bottom support frame for the load-bearing inclined arch leg (10): Assemble the bottom support frame of the load-bearing inclined arch leg (10) on the road surface (31) at the arch foot (1), and adjust the lifting rod (58) to the designated position so that the arch foot support plate (56) is supported on the bottom of the inclined brace (3) of the arch foot (1), and the top line of the arch foot support plate (56) matches the bottom structure of the inclined brace (3). S04. Removal and dismantling of the isolation and protection bracket for the assembled load-bearing inclined arch leg (10): On the road surface (31) below the bottom of the diagonal brace (3), the load-bearing diagonal arch leg (10) is assembled. The isolation and protection bracket is removed and the support rod (43) is adjusted to the designated position so that the support plate (42) is supported on the bottom of the diagonal brace (3). The top line of the support plate (42) matches the bottom structure of the diagonal brace (3). S05. Install protective suspension brackets: Install a protective suspension frame on the road surface (31) between the isolation and protection bracket of the load-bearing inclined arch leg (10) and the support frame at the bottom of the load-bearing inclined arch leg (10); S06. Install half-width road closure steel support structure: A half-width road closure steel support structure is erected on the road surface (31) on both sides of the central median (13). The half-width road closure steel support structure includes a crossbeam (69). S07. Erect the bridge jacking and prestressing support structure and complete the beam structure transformation: The longitudinal beam (66) is anchored to the beam body below the bridge deck (4) by the anchor bolts (65) pre-embedded under the solid web plate (8). After adjusting the jack (67) to lift the solid web plate (8) to the designated position, the longitudinal beam (66) and the transverse beam (69) are welded together. Then the inclined arch leg (10) of the arch foot (1) is removed to realize the conversion of the inclined leg rigid frame bridge structure into a continuous beam bridge. S08. Install the crash barrier cutting and removal bracket and the crash barrier cutting and stabilizing bracket: After the bridge structure transformation is completed, the second support column (120) is hoisted with the help of the bridge jacking pre-stressing support structure. The anti-collision barrier cutting and dismantling support is installed below the bridge deck (4). At the same time, the anti-collision barrier cutting and stabilizing support is installed on the cutting and dismantling support base plate (104) of the anti-collision barrier cutting and dismantling support. The anti-collision barrier cutting and stabilizing support includes an inverted L-shaped stabilizing plate (108) for hanging on the top of the reinforced concrete anti-collision barrier (107). S09. Install the crash barrier cutting guide frame: A crash barrier cutting guide frame is installed on the top center of the bridge deck (4), and a winch (124) is installed on the top of the cutting guide frame base (122) of the crash barrier cutting guide frame. The plug-in rod (110) of the crash barrier cutting guide frame is installed on the suspension plate (113), and then a second positioning plate (125) is hung on the end of the telescopic rod (114) on the side of the plug-in rod (110) by a steel wire rope (115). The top center of the cutting guide frame base (122) is provided with a slide rail groove (123), and the sliding base (109) is placed in the slide rail groove (123). The top of the sliding base (109) is provided with multiple rows of vertical support rods (106), and the top of the vertical support rods (106) is provided with a suspension plate (113). The top of the suspension plate (113) is evenly provided with reserved holes for installing the plug-in rod (110). S10. Deploy the movable support structure: A mobile support structure is erected with the help of a bridge jacking preloading support structure and a crash barrier cutting and dismantling support structure. The mobile support structure includes a U-shaped support groove (99), a water storage tank (100), a wastewater collection tank (87), and a drainage pipe (81) connecting the water storage tank (100) and the wastewater collection tank (87). S11. Remove the reinforced concrete crash barrier (107): First, hang the inverted L-shaped stabilizing plate (108) on the top of the reinforced concrete crash barrier (107). Then, adjust the telescopic rod (114) to the designated position so that the second positioning plate (125) is located at the cutting line position. Align the second positioning plate (125) with the determined position and then use a static cutting machine to cut the reinforced concrete crash barrier (107). At the same time, use the water storage tank (100) to spray and reduce dust, and use the wastewater collection tank (87) to settle the wastewater. Then, use the drainage pipe (81) to transport the water to the water storage tank (100) to achieve wastewater reuse. Then, the cutting guide frame base (122) is slid by the winch (124) to achieve the removal of the reinforced concrete crash barriers (107) at different positions; S12. Deploy the pre-removal plate lifting and dismantling device: A preliminary removal plate lifting and removal device is installed on the top of the bridge abutment (2). The preliminary removal plate lifting and removal device includes a lifting rod (35). At the same time, a fixing frame (41) is welded on the top of the anchor bar (61), and multiple rows of connecting rods (40) and a first positioning plate (39) are welded on the side of the fixing frame (41). S13. Cutting and hoisting the pre-removed panels (38): Align the first positioning plate (39) with the position determined by the static cutting machine to cut off the plate (38) to be removed first. Then adjust the lifting rod (35) to the designated position. Then use the binding wire rope (36) and the suspension wire rope (37) to lift the cut plate (38) to the designated position. S14. Remove the load-bearing arch legs: A crane (33) was used to erect a construction platform (102) for cutting the arch foot of the arch leg. After the first board (38) is removed, the space left at the bridge deck (4) is used to set up the arch foot cutting construction platform (102). The arch foot cutting construction platform (102) is hoisted to the arch foot (1) using the suspension steel wire rope (37). The diagonal bracing (3) was cut off using a static cutting machine. At the same time, the diagonal bracing (3) of the steel plate joint (5) and the cast-in-place wet joint (6) was cut off using a static cutting machine on the operating platform (44) for chiseling and removing the isolation protection bracket of the load-bearing diagonal arch leg (10), and then hoisted to the designated position. S15. Dismantling and transporting the main beams and abutments (2): Remove the bottom support frame and protective suspension frame of the load-bearing inclined arch leg (10), then use the sliding of the mobile support structure to realize the overall removal and transportation of the bridge deck (4), and finally remove the bridge abutment (2).

2. The construction method for the rapid demolition structure of an overpass as described in claim 1, characterized in that, The specific steps of step S05 are as follows: connect the concrete base (51) of the support, the fixed base (57) and the protective net base (53) through the U-shaped plug (52), and then hang the protective net (54) on the hanging steel wire rope hanging rod (59).

3. The construction method for the rapid demolition structure of an overpass as described in claim 2, characterized in that, The specific steps of step S06 are as follows: pour the steel pipe column fixing base (71) on the road surface (31), install multiple rows of steel pipe columns (73) on the top of the steel pipe column fixing base (71), and install the crossbeam (69) on the top of the steel pipe column (73).

4. The construction method for the rapid demolition structure of an overpass as described in claim 3, characterized in that, The specific steps of step S10 are: pouring the base of the steel pipe column (73) on the road surface (31) and installing the steel pipe column (73); Install a steel plate platform (94) on the top of the steel pipe column (73), hang wastewater collection tanks (87) on both sides of the steel plate platform (94), install a lifting jack (86) on the top of the steel plate platform (94), and connect the jack extension rod (84) to the sleeve (85); Adjust the jack extension rod (84) to the designated position so that the U-shaped support groove (99) is supported under the main beam. At the same time, install water storage tanks (100) and protective nets (80) on both sides of the U-shaped support groove (99).

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