A method for constructing a shock-absorbing steel structure bridge

Abstract

This application relates to the technical field of steel structure bridges, specifically to a construction method for a vibration-damping steel structure bridge. The construction method includes the following steps: S1. Composite beam construction; S2. Seismic structure construction: S2.1 Seismic structure construction of the first construction section; S2.2 Seismic structure construction of the second construction section; S3. Main structure construction: S3.1 Main structure construction of the first construction section; S3.2 Main structure construction of the second construction section; S4. Expansion joint construction. This construction method, by adapting to the stress conditions and specific structures of different construction sections and setting appropriate foundation structures under different construction sections, effectively reduces the impact of subway traffic on the superstructure steel bridge.

Description

Technical Field

[0001] This application relates to the technical field of steel structure bridges, and specifically to a construction method for vibration-damping steel structure bridges. Background Technology

[0002] With urban land resources becoming increasingly scarce, comprehensive land utilization and improved land use efficiency have become key concerns for urban planners. Subway depots, due to their large land area, can be fully utilized for property development, combining residential and public building facilities with planning, thus maximizing the commercial value of the space above the subway.

[0003] A certain project is a residential building built above a subway station, for reference. Figure 1 and Figure 2 To facilitate residents' passage, a steel structure bridge 2 is constructed on the road connecting the subway throat area to the top of the warehouse. To distinguish the steel structure bridges connecting different subway throat areas to the top of the warehouse, the steel structure bridge 2 is divided into a first construction section 21 and a second construction section 22. The first construction section 21 connects the first throat area with the top of the warehouse. The upper part of the first construction section 21 functions as a pedestrian overpass, and the lower part serves as the foundation for the municipal road. The second construction section 22 connects the second throat area with the top of the warehouse, where there is a significant height difference.

[0004] However, when the subway is in use, it generates significant vibrations, which are transmitted to the steel bridge structure above, causing it to vibrate. This can lead to discomfort for residents and even pose safety hazards to the steel bridge structure. Summary of the Invention

[0005] In order to reduce the impact of subway traffic on the superstructure steel bridge, this application provides a construction method for vibration-damping steel bridges.

[0006] This application provides a construction method for a vibration-damping steel structure bridge, which adopts the following technical solution:

[0007] A construction method for a vibration-damping steel structure bridge includes the following steps:

[0008] S1. Composite beam construction: Install the composite beam reinforcement of the lower foundation, tie the composite beam structural reinforcement, and determine the pile connection points of the lower foundation and subway structure of the first and second construction sections respectively. At the determined pile connection points, pre-embed several large-diameter bolts and tie them to the composite beam structural reinforcement. Set a cross shear plate on the upper side of the large-diameter bolt at each pile connection point.

[0009] S2. Construction of seismic-resistant structures:

[0010] S2.1 Seismic structure construction of the first construction section: The first construction section is divided into section a and section b according to structural function; during the construction of section a, bidirectional pull-out supports are installed on the cross shear steel plates of the foundation at section a; during the construction of section b, ball hinge supports are installed on the cross shear steel plates of the foundation at section b.

[0011] S2.2 Seismic structure construction of the second construction section: Spherical hinge bearings are installed on the cross shear steel plates of the lower foundation at the higher end of the second construction section; anti-slip bearings are installed on the cross shear steel plates of the lower foundation at the lower end of the second construction section.

[0012] S3. Main structure construction: Erect formwork, pour concrete, and after the concrete reaches the design strength...

[0013] S3.1 Construction of the main structure of the first construction section: hoist the steel structure columns, connect the lower end of the steel structure columns to the corresponding bidirectional anti-tension support or ball hinge support, and then hoist the main steel structure beams at the upper end of the steel structure columns;

[0014] S3.2 Second construction section main structure construction: hoist the main steel structure frame, connect the higher end of the main steel structure frame to the ball joint support, connect the lower end of the main steel structure frame to the anti-slip support, and set up supporting truss members inside the main steel structure frame;

[0015] S4. Expansion joint construction: Expansion joints are set at the connection between the first and second construction sections and the subway warehouse. The width of the expansion joint is 100mm to 300mm.

[0016] In the construction of residential buildings above subway stations, to reduce the impact of subway traffic on the upper steel structure bridge, a composite beam is used to connect with the subway depot structure, transferring forces to the subway structure's pile foundations and improving the stability of the steel structure bridge. Using this technical solution, in section a of the first construction segment, bidirectional tension bearings are installed on the foundations of the steel structure columns, and in section b of the first construction segment, spherical hinge bearings are installed on the foundations of the steel structure columns. The combination of bidirectional tension bearings and spherical hinge bearings mitigates vibrations transmitted during subway traffic. Furthermore, the bidirectional tension bearings reduce the impact of municipal roads located below section a on the foundations of the steel structure columns. In the second construction segment, spherical hinge bearings are installed on the foundations at the higher end to reduce the impact of vibrations, while anti-slip bearings are installed on the foundations at the lower end of the second construction segment to address the tendency for lateral slippage of the main steel structure frame. Through the coordination of various damping bearings, the safety and comfort of the steel structure bridge are improved by minimizing the impact of subway traffic on the upper steel structure bridge.

[0017] Optionally, in step S3, during the first concrete pour, the concrete is first poured up to below the cross shear steel plate to ensure that the concrete strength of the section at the height of the large-diameter bolts reaches the design strength. Then, the steel structure columns and the main steel structure frame are hoisted and fixed, and a second concrete pour is carried out until the cross shear steel plate is completely covered.

[0018] Because the steel structure columns and the main steel structure frame are very heavy, directly hoisting them onto the composite beam could cause the already tied reinforcing steel bars of the composite beam to collapse. By adopting the above-mentioned technical solution, the concrete is poured in two stages. After the first pour reaches the design strength, the steel structure columns and the main steel structure frame are hoisted separately, which improves the safety of the construction process.

[0019] Optionally, in step S3, after the second concrete pour reaches the design strength, backfill soil under the composite beam in section a to 100mm to 200mm from the upper side of the composite beam.

[0020] By adopting the above technical solutions, backfill soil can serve as a relatively natural roadbed, saving costs. On the other hand, backfill soil has a shock absorption effect, which can further improve the shock absorption effect of steel structure bridges.

[0021] Optionally, the lower side of the cross-shaped shear steel plate is fixedly connected to the reinforcing bars of the composite beam structure, and several large-diameter bolts pass through the four corner gaps of the cross-shaped shear steel plate.

[0022] By adopting the above technical solution, pre-embedding large-diameter bolts in the lower foundation and adding cross-shaped shear-resistant steel plates at the bottom of the steel structure column, the shear resistance of the lower foundation of the steel structure column can be improved.

[0023] Optionally, the bidirectional pull-out support includes a lower fixed plate, an upper fixed plate, several viscous dampers, and several pull-out spring mechanisms. The lower fixed plate is horizontally arranged below the upper fixed plate, and the upper fixed plate is parallel to the lower fixed plate. The lower fixed plate is installed on the cross shear steel plate, and one end of several large-diameter bolts facing the cross shear steel plate passes through the lower fixed plate.

[0024] One end of each of the viscous dampers is connected to the lower fixed plate, and the other end of each of the viscous dampers is connected to the upper fixed plate. One end of each of the pull-out spring mechanisms is connected to the lower fixed plate, and the other end of each of the pull-out spring mechanisms is connected to the upper fixed plate.

[0025] Several viscous dampers and several anti-pull-out spring mechanisms are respectively arranged circumferentially between the lower fixed plate and the upper fixed plate.

[0026] By adopting the above technical solution, the steel structure column and composite beam are connected by a bidirectional pull-out support. The viscous damper and the pull-out spring mechanism work together to support the steel structure column. Both the viscous damper and the pull-out spring mechanism have energy absorption functions, which can absorb the vibration generated when the subway passes through, thereby reducing the impact of vibration on the superstructure. In addition, the viscous damper and the pull-out spring mechanism have strong pull-out resistance, which improves the stability of the bidirectional pull-out support.

[0027] Optionally, several of the viscous dampers are arranged at relative angles, with the angle of the viscous dampers being 10° to 30°.

[0028] By adopting the above technical solution, the viscous damper is tilted, which facilitates the support of the upper fixed plate by the viscous damper, so that the viscous damper can maintain a state of force balance under normal conditions.

[0029] Optionally, the anti-pull-out spring mechanism includes a first sleeve, in which an upper sealing plate and a lower sealing plate are spaced apart, and an elastic element is provided between the upper sealing plate and the lower sealing plate;

[0030] The first sleeve has an upper isolation plate and a lower isolation plate at each end.

[0031] An upper connecting rod is provided on the side of the upper sealing plate away from the lower sealing plate, and the end of the upper connecting rod away from the upper sealing plate slides through the upper isolation plate and connects to the upper fixing plate.

[0032] A lower connecting rod is provided on the side of the lower sealing plate away from the upper sealing plate. The end of the lower connecting rod away from the lower sealing plate slides through the lower isolation plate and connects to the lower fixing plate.

[0033] By adopting the above technical solution, when the vibration generated by subway traffic is transmitted to the bidirectional anti-uplift support, the elastic element deforms to absorb part of the vibration energy. When the vibration reduced by the elastic element is transmitted to the steel structure column, the impact on the superstructure is small and does not affect the normal passage of residents.

[0034] Optionally, a first cavity is formed between the upper sealing plate and the upper isolation plate, a second cavity is formed between the upper sealing plate and the lower sealing plate, and a third cavity is formed between the lower sealing plate and the lower isolation plate. The second cavity is filled with a damping medium, and a plurality of connection holes are provided on both the upper sealing plate and the lower sealing plate.

[0035] By adopting the above technical solution, when the vibration is transmitted to the anti-pulling spring mechanism, on the one hand, the influence of the vibration is reduced by the deformation of the elastic element, and on the other hand, the energy of the vibration is continuously reduced by the back-and-forth flow of the damping medium in the first cavity, the second cavity and the third cavity, thereby further reducing the impact of the vibration on the upper structure.

[0036] Optionally, a second sleeve is fitted on the outer side of the bidirectional pull-out support, a limiting ring is provided at the upper end of the second sleeve, and an abutment plate is provided at the lower end of the second sleeve.

[0037] By adopting the above technical solution, a second sleeve is installed on the outside of the viscous damper and the pull-out spring mechanism, which can protect the viscous damper and the pull-out spring mechanism and prevent damage to the viscous damper and the pull-out spring mechanism during construction.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. In the construction of residential buildings above subway stations, in order to reduce the impact of subway traffic on the upper steel structure bridge, a composite beam is used to connect with the subway depot structure, transferring the force to the pile foundation of the subway structure and improving the stability of the steel structure bridge.

[0040] 2. At section a of the first construction phase, bidirectional tension supports are installed on the foundation of the steel structure column. At section b of the first construction phase, spherical hinge supports are installed on the foundation of the steel structure column. The combination of bidirectional tension supports and spherical hinge supports helps to mitigate the vibration transmitted by the subway passing underneath. In addition, the bidirectional tension supports can reduce the impact of the municipal road being built under section a on the foundation of the steel structure column.

[0041] 3. Spherical hinge supports are installed on the lower foundation at the higher end of the second construction section to reduce the impact of vibrations. Anti-slip supports are installed on the lower foundation at the lower end of the second construction section to address the tendency of the main steel frame to slide laterally.

[0042] 4. Because the steel structure columns and the main steel structure frame are very heavy, directly hoisting them onto the composite beam may cause the already tied reinforcing steel bars of the composite beam to collapse. Therefore, the concrete is poured in two stages. After the first pour reaches the design strength, the steel structure columns and the main steel structure frame are hoisted separately, which improves the safety of the construction process. Attached Figure Description

[0043] Figure 1 This is a three-dimensional structural diagram of the first construction section in the embodiments of this application.

[0044] Figure 2 This is a three-dimensional structural diagram of the second construction section in the embodiments of this application.

[0045] Figure 3 This is a schematic diagram of the bidirectional pull-out support in the embodiments of this application.

[0046] Figure 4 This is a cross-sectional structural schematic diagram of the bidirectional pull-out support in the embodiments of this application.

[0047] Figure 5 This is a cross-sectional structural schematic diagram of the anti-pull-out spring mechanism in the embodiments of this application.

[0048] Reference numerals: 1. Composite beam; 2. Steel structure bridge; 21. First construction section; 22. Second construction section; 23. Large-diameter bolt; 24. Cross-shaped shear plate; 25. Steel structure column; 26. Main steel structure beam; 27. Diagonal bracing beam; 28. Main steel structure frame; 3. Bidirectional pull-out support; 31. Lower fixing plate; 311. Reinforcing plate; 32. Upper fixing plate; 33. Viscous damper; 34. Pull-out spring mechanism; 341. 342. First sleeve; 342. Upper sealing plate; 3421. Connecting hole; 343. Lower sealing plate; 344. Elastic element; 345. Upper isolation plate; 346. Lower isolation plate; 347. Upper connecting rod; 348. Lower connecting rod; 35. First cavity; 36. Second cavity; 37. Third cavity; 38. Damping medium; 39. Second sleeve; 391. Limiting ring; 392. Abutment plate; 4. Ball joint support; 5. Anti-slip support. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 This application will be described in further detail below.

[0050] A construction method for a vibration-damping steel structure bridge includes the following steps:

[0051] Construction of S1. Composite Beam 1: Refer to... Figure 1 and Figure 2 To transfer the forces acting on the vibration-damping steel bridge 2 to the pile foundation of the subway structure, a composite beam 1 is used to connect it to the subway structure. First, the reinforcing bars of the composite beam 1 are installed in the lower foundation. Based on the locations of the first construction section 21 and the second construction section 22, the beams and columns of the subway structure's top slab are selected as the installation sites for the reinforcing bars. The reinforcing bars of the composite beam 1 are tied and fixed to the installed reinforcing bars, either by binding or welding, to enhance the connection strength between the composite beam 1 and the subway structure. Then, the connection points between the lower foundations of the first construction section 21 and the second construction section 22 and the pile positions of the subway structure are determined by positioning and laying out lines. Several large-diameter bolts 23 are pre-embedded at the determined pile connection points and tied to the reinforcing bars of the composite beam 1. The large-diameter bolts 23 are arranged in a circular array.

[0052] Reference Figure 1 and Figure 3 At each pile connection point, a cross-shaped shear plate 24 is fixedly installed on the upper side of the large-diameter bolt 23. Several large-diameter bolts 23 pass through the four corner gaps of the corresponding cross-shaped shear plate 24. To enhance the stability of the cross-shaped shear plate 24, it is welded and fixed to the reinforcing steel of the composite beam 1. The shear resistance at this location is enhanced by installing the cross-shaped shear plate 24.

[0053] S2. Construction of seismic-resistant structures:

[0054] S2.1 First Construction Section 21 Seismic Structure Construction: Refer to Figure 1 and Figure 3 The first construction section 21 is divided into section a and section b according to structural function. The upper part of section a serves as a pedestrian overpass, and a municipal road is set up at the composite beam 1 at the lower part of section a. The upper part of section b is connected to the upper part of section a and is used as a pedestrian overpass together. The lower part of section b serves as an equipment room, making secondary use of the lower space of the first construction section 21 and improving the space utilization rate of the subway. During the construction of section a, bidirectional pull-out supports 3 are set on the cross shear steel plate 24 of the foundation at section a. During the construction of section b, ball joint supports 4 are set on the cross shear steel plate 24 of the foundation at section b.

[0055] Because the composite beam 1 at the bottom of section a serves as the foundation for the municipal road, the foundation of section a will bear greater compressive and tensile forces compared to the foundation of section b, thus requiring higher strength at the connection points. Specifically, refer to... Figure 1 A bidirectional pull-out support 3 is installed at the bottom of section a. When vehicles travel on municipal roads, it can alleviate the problem of the lower foundation bearing tensile force at the end away from the vehicle and bearing compressive force at the end closer to the vehicle. A ball joint support 4 is installed at the bottom of section b. It can reduce the impact of subway traffic on the superstructure.

[0056] S2.2 Second Construction Section 22 Seismic Structure Construction: Refer to Figure 2The second construction section 22 is an elevator escalator with a steel main structure, connecting the throat area 2 with a height difference to the top surface of the main building. Spherical hinge supports 4 are installed on the cross-shaped shear steel plates 24 of the lower foundation at the higher end of the second construction section 22. Existing spherical hinge supports 4 are used. Anti-slip supports 5 are installed on the cross-shaped shear steel plates 24 of the lower foundation at the lower end of the second construction section 22. Existing anti-slip supports 5 are used. When the subway is in operation, the lower foundation at the higher end of the second construction section 22 bears the vibration transmitted from the lower structure. The spherical hinge supports 4 reduce the impact of vibration on the higher end of the second construction section 22. For the lower foundation at the lower end of the second construction section 22, in addition to dealing with the vibration transmitted from the lower structure, the lower foundation also needs to resist the lateral slippage tendency generated by its own structure during vibration. The anti-slip supports 5 improve the resistance of the lower foundation at the lower end of the second construction section 22 to its own structural slippage tendency.

[0057] S3. Main structure construction: Erect the formwork for composite beam 1, pour concrete into the formwork, and after the concrete reaches the design strength, construct the main structure of the first construction section 21 and the main structure of the second construction section 22 respectively.

[0058] S3.1 First Construction Section 21 Construction: Refer to Figure 1 The steel structure column 25 is hoisted and its lower end is connected to the corresponding bidirectional tension support 3 or spherical hinge support 4. Specifically, for section a, the lower end of the steel structure column 25 is connected to the bidirectional tension support 3, and for section b, the lower end of the steel structure column 25 is connected to the spherical hinge support 4. Because the steel structure column 25 has a large mass, construction safety needs to be ensured during the connection process. When connecting the steel structure column 25, a crane is used to keep the steel structure column 25 in a vertical state. Then, a connection method of bolting first and then welding is adopted to improve the connection strength between the steel structure column 25 and the lower foundation, while ensuring construction safety. Then, the main steel structure beam 26 is hoisted to the upper end of the steel structure column 25. The main steel structure beam 26 is fixed to the steel structure column 25 by welding. Diagonal bracing beams 27 are set between the steel structure columns 25 to improve the overall stability of the steel structure column 25.

[0059] Construction of Section 22, S3.2: Refer to Figure 2The main steel frame 28 is hoisted by a crane. The higher end of the main steel frame 28 is connected to the ball joint support 4, and the lower end of the main steel frame 28 is connected to the anti-slip support 5. Because the main steel frame 28 has a large mass, the two ends of the main steel frame 28 are connected by bolting first and then welding. It should be noted that the lower end of the main steel frame 28 is connected first, and then the higher end is connected. Support truss members are set inside the main steel frame 28 to improve the overall stability of the main steel frame 28.

[0060] S3.3 Steel Structure Inspection and Maintenance: After the main structure construction of the first construction section 21 and the second construction section 22 is completed, the steel structure shall be inspected for defects and fireproof coating shall be applied to the surface of the steel structure. In particular, the weld joints shall be treated with anti-corrosion and fireproof measures to improve the weather resistance and fire resistance of the steel structure.

[0061] S3.4 Construction of ancillary structures: For the first construction section 21, bridge deck formwork is set up, steel bars are tied and concrete is poured. After reaching the design strength, the formwork is removed to form the bridge deck. Equipment rooms are constructed below section b in the first construction section 21. The superstructure is used as the beam top of the lower equipment room. Waterproofing of the bridge deck is carried out. The parapet wall at the junction of the equipment room and the subway warehouse is removed to facilitate subsequent construction steps.

[0062] For the second construction section 22, after step S3.3 is completed, the escalator is hoisted, the relevant electrical equipment is installed, and the equipment is tested and accepted.

[0063] S4. Expansion Joint Construction: In order to cope with the vibration transmitted from the substructure and the impact of the deformation of the steel structure bridge 2 itself, expansion joints are set at the connection between the first construction section 21 and the second construction section 22 and the subway warehouse. The expansion joint is constructed by using prefabricated expansion joints to close the gap with a width of 200mm, and laying bricks at the expansion joint location so that the deformation only affects the upper bricks at this location, reducing the interference to the main structure and the paving effect in other locations.

[0064] S5. Final Construction: Complete the landscaping work for the first construction section 21 and the second construction section 22.

[0065] Specifically, in step S3, during the first concrete pour, the concrete is poured up to below the cross-shaped shear plate 24 to ensure that the concrete strength at the height of the large-diameter bolts 23 reaches the design strength. Then, the steel structure columns 25 and the main steel structure frame 28 are hoisted and fixed to their respective substructures. Formwork is then erected for a second concrete pour until the cross-shaped shear plate 24 is completely covered. Because the steel structure columns 25 and the main steel structure frame 28 are relatively heavy, directly hoisting them onto the composite beam 1 reinforcement could easily collapse the already tied reinforcement. Pouring a portion of the concrete first to reach the design strength provides support for the steel structure columns 25 and the main steel structure frame 28, improving safety during construction.

[0066] In step S3, after the second concrete pour reaches its design strength, backfill soil is placed under the composite beam 1 in section a to a distance of 100mm to 200mm from the upper side of the composite beam 1. This backfill soil forms a relatively natural roadbed and isolates the subway roof slab from the composite beam 1. The backfill soil also has a buffering effect, reducing vibrations transmitted from below and minimizing their impact on the superstructure. Reinforcing steel bars are then laid on top of the backfill soil, and concrete is poured to form the road surface for vehicle traffic.

[0067] Reference Figure 3 and Figure 4 In step S2, the bidirectional pull-out support 3 includes a lower fixed plate 31, an upper fixed plate 32, two viscous dampers 33, and two pull-out spring mechanisms 34. Both the lower fixed plate 31 and the upper fixed plate 32 are horizontally arranged, and the central axis of the lower fixed plate 31 coincides with the central axis of the upper fixed plate 32. The lower fixed plate 31 is installed on the upper side of the cross-shaped shear steel plate 24. Several large-diameter bolts 23, with one end facing the cross-shaped shear steel plate 24, pass through the lower fixed plate 31 and are fixed by nuts. The viscous dampers 33 are existing viscous dampers. One end of each of the two viscous dampers 33 is rotatably connected to the upper side of the lower fixed plate 31. The other end of each viscous damper 33 is rotatably connected to the lower side of the upper fixed plate 32. Both viscous dampers 33 are inclined relative to each other, with an inclination angle of 10° to 30°. Two pull-out spring mechanisms 34 are vertically arranged between the lower fixed plate 31 and the upper fixed plate 32. One end of each pull-out spring mechanism 34 is fixedly connected to the upper side of the lower fixed plate 31, and the other end is fixedly connected to the lower side of the upper fixed plate 32. The two viscous dampers 33 and the two pull-out spring mechanisms 34 are circumferentially spaced between the lower fixed plate 31 and the upper fixed plate 32. Through the cooperation of the viscous dampers 33 and the pull-out spring mechanisms 34, the compressive and tensile strength of the foundation of the steel structure column 25 is improved, and the vibration transmitted from the lower subway structure is buffered.

[0068] Reference Figure 3 and Figure 4 In step S2, the lower end of the steel structure column 25 is fixedly connected to the upper side of the upper fixing plate 32. In order to enhance the connection strength between the steel structure column 25 and the upper fixing plate 32, a number of reinforcing plates 311 are provided at the connection between the steel structure column 25 and the upper fixing plate 32. The number of reinforcing plates 311 are arranged in a circular array on the upper side of the upper fixing plate 32.

[0069] Reference Figure 4 and Figure 5 The anti-pull-out spring mechanism 34 includes a first sleeve 341. An upper sealing plate 342 and a lower sealing plate 343 are spaced apart inside the first sleeve 341. The upper sealing plate 342 and the lower sealing plate 343 are arranged parallel to each other, and the upper sealing plate 342 and the lower sealing plate 343 can reciprocate along the length direction of the first sleeve 341 under the constraint of the inner wall of the first sleeve 341. An elastic element 344 is provided between the upper sealing plate 342 and the lower sealing plate 343. One end of the elastic element 344 is fixedly connected to the upper side of the lower sealing plate 343, and the other end of the elastic element 344 is fixedly connected to the lower side of the upper sealing plate 342. In this embodiment, the elastic element 344 is a high-strength torque spring. An upper isolation plate 345 and a lower isolation plate 346 are fixedly installed at both ends of the first sleeve 341, respectively. The upper isolation plate 345 and the lower isolation plate 346 are arranged parallel to each other. An upper connecting rod 347 is fixedly installed on the side of the upper sealing plate 342 away from the lower sealing plate 343. The end of the upper connecting rod 347 away from the upper sealing plate 342 slides through the upper isolation plate 345 and is fixedly connected to the upper fixed plate 32. A lower connecting rod 348 is installed on the side of the lower sealing plate 343 away from the upper sealing plate 342. The end of the lower connecting rod 348 away from the lower sealing plate 343 slides through the lower isolation plate 346 and is fixedly connected to the lower fixed plate 31. When the subway is passing under the lower structure, the vibration energy transmitted from the lower structure is absorbed by the pull-out spring mechanism 34, thereby reducing the impact of vibration on the upper structure.

[0070] Reference Figure 4 and Figure 5 A first cavity 35 is formed between the upper sealing plate 342 and the upper isolation plate 345, a second cavity 36 is formed between the upper sealing plate 342 and the lower sealing plate 343, and a third cavity 37 is formed between the lower sealing plate 343 and the lower isolation plate 346. The second cavity 36 is filled with a damping medium 38. In this embodiment, the damping medium 38 is silicone oil. Both the upper sealing plate 342 and the lower sealing plate 343 are provided with a plurality of connection holes 3421. When vibration is transmitted, the elastic element 344 and the damping medium 38 cooperate to reduce the impact of vibration.

[0071] To reduce external interference to the viscous damper 33 and the anti-pulling spring mechanism 34, refer to Figure 3 and Figure 4 A second sleeve 39 is fitted on the outer side of the bidirectional pull-out support 3. A limiting ring 391 is provided at the upper end of the second sleeve 39. The upper side of the upper fixing plate 32 abuts against the lower side of the limiting ring 391. An abutment plate 392 is provided at the lower end of the second sleeve 39. The upper side of the abutment plate 392 abuts against the lower side of the lower fixing plate 31. The lower side of the abutment plate 392 is welded and fixed to the cross-shaped shear steel plate 24. Several large-diameter bolts 23 pass through the abutment plate 392 and the lower fixing plate 31 at one end facing the cross-shaped shear steel plate 24 and are then fixed by nuts. By providing a second sleeve 39 on the outside of the viscous damper 33 and the pull-out spring mechanism 34, the two are separated from the external connection, reducing the probability of damage to the viscous damper 33 and the pull-out spring mechanism 34 during construction and extending the service life of the bidirectional pull-out support 3.

[0072] The implementation principle of this application embodiment is as follows: The composite beam 1 connects to the subway structure, transmitting force to the subway structure's pile foundation. To address different construction conditions, in section a of the first construction segment 21, a bidirectional tension bearing 3 is installed at the lower foundation of the steel column 25; in section b of the first construction segment 21, a spherical hinge bearing 4 is installed at the lower foundation of the steel column 25. The bidirectional tension bearing 3 and the spherical hinge bearing 4 work together to mitigate vibrations transmitted during subway traffic. Furthermore, the bidirectional tension bearing 3 reduces the impact of a municipal road being constructed below section a on the lower foundation of the steel column 25. In the second construction segment 22, a spherical hinge bearing 4 is installed at the higher end of the lower foundation to reduce the impact of vibrations below. An anti-slip bearing 5 is installed at the lower end of the lower foundation of the second construction segment 22 to address the tendency of the main steel frame 28 to slide laterally. By coordinating multiple construction segments, the safety of the steel structure bridge 2 is improved, while also enhancing the comfort of residents' passage.

[0073] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction method for a vibration-damping steel structure bridge, characterized in that, Includes the following steps: S1. Construction of composite beam (1): Plant the reinforcing bars of the composite beam (1) of the lower foundation, tie the reinforcing bars of the composite beam (1) structure, and determine the pile connection points of the lower foundation and the subway structure of the first construction section (21) and the second construction section (22) respectively. At the determined pile connection points, pre-embed several large-diameter bolts (23) and tie them to the reinforcing bars of the composite beam (1) structure. Set a cross shear plate (24) on the upper side of the large-diameter bolt (23) at each pile connection point. S2. Seismic-resistant structure construction: S2.1 Seismic structure construction of the first construction section (21): The first construction section (21) is divided into section a and section b according to the structural function; when constructing section a, bidirectional pull-out supports (3) are set on the cross shear steel plate (24) of the lower foundation at section a; when constructing section b, ball hinge supports (4) are set on the cross shear steel plate (24) of the lower foundation at section b. S2.2 Seismic structure construction of the second construction section (22): Spherical hinge bearings (4) are installed on the cross shear steel plate (24) of the lower foundation at the higher end of the second construction section (22); anti-slip bearings (5) are installed on the cross shear steel plate (24) of the lower foundation at the lower end of the second construction section (22). S3. Main structure construction: Erect formwork, pour concrete, and after the concrete reaches the design strength: S3.1 First construction section (21) Main structure construction: hoist the steel structure column (25), connect the lower end of the steel structure column (25) to the corresponding bidirectional pull-out support (3) or ball hinge support (4), and then hoist the main steel structure beam (26) at the upper end of the steel structure column (25). S3.2 Second construction section (22) Main structure construction: hoist the main steel structure frame (28), the higher end of the main steel structure frame (28) is connected to the ball hinge support (4), the lower end of the main steel structure frame (28) is connected to the anti-slip support (5), and support truss members are set inside the main steel structure frame (28); S4. Construction of expansion joints: Expansion joints are set at the connection between the first construction section (21) and the second construction section (22) and the metro warehouse. The width of the expansion joint is 100mm to 300mm.

2. The construction method for a vibration-damping steel structure bridge according to claim 1, characterized in that, In step S3, when pouring concrete for the first time, pour it up to below the cross shear steel plate (24) to ensure that the concrete strength of the part at the height of the large diameter bolt (23) reaches the design strength. Then, hoist the steel structure column (25) and the main steel structure frame (28) and fix them. Then, pour concrete for the second time until the cross shear steel plate (24) is completely covered.

3. The construction method for a vibration-damping steel structure bridge according to claim 1, characterized in that, In step S3, after the second concrete pour reaches the design strength, backfill soil under the composite beam (1) in section a to 100mm to 200mm away from the upper side of the composite beam (1).

4. The construction method for a vibration-damping steel structure bridge according to claim 1, characterized in that, The lower side of the cross-shaped shear steel plate (24) is fixedly connected to the structural reinforcement of the composite beam (1), and several large-diameter bolts (23) pass through the four corner gaps of the cross-shaped shear steel plate (24).

5. A construction method for a vibration-damping steel structure bridge according to claim 4, characterized in that, The bidirectional pull-out support (3) includes a lower fixed plate (31), an upper fixed plate (32), several viscous dampers (33) and several pull-out spring mechanisms (34). The lower fixed plate (31) is horizontally arranged below the upper fixed plate (32), and the upper fixed plate (32) is parallel to the lower fixed plate (31). The lower fixed plate (31) is installed on the cross shear steel plate (24), and the ends of several large-diameter bolts (23) facing the cross shear steel plate (24) all pass through the lower fixed plate (31). One end of each of the viscous dampers (33) is connected to the lower fixed plate (31), and the other end of each of the viscous dampers (33) is connected to the upper fixed plate (32). One end of each of the pull-out spring mechanisms (34) is connected to the lower fixed plate (31), and the other end of each of the pull-out spring mechanisms (34) is connected to the upper fixed plate (32). Several viscous dampers (33) and several anti-pull-out spring mechanisms (34) are respectively arranged circumferentially between the lower fixed plate (31) and the upper fixed plate (32).

6. The construction method for a vibration-damping steel structure bridge according to claim 5, characterized in that, Several of the viscous dampers (33) are arranged at an angle relative to each other, and the angle of inclination of the viscous dampers (33) is 10° to 30°.

7. A construction method for a vibration-damping steel structure bridge according to claim 5, characterized in that, The anti-pull-out spring mechanism (34) includes a first sleeve (341), an upper sealing plate (342) and a lower sealing plate (343) are spaced apart inside the first sleeve (341), and an elastic element (344) is provided between the upper sealing plate (342) and the lower sealing plate (343). The first sleeve (341) has an upper isolation plate (345) and a lower isolation plate (346) respectively at both ends of its ports. An upper connecting rod (347) is provided on the side of the upper sealing plate (342) away from the lower sealing plate (343). The end of the upper connecting rod (347) away from the upper sealing plate (342) slides through the upper isolation plate (345) and connects to the upper fixing plate (32). A lower connecting rod (348) is provided on the side of the lower sealing plate (343) away from the upper sealing plate (342). The end of the lower connecting rod (348) away from the lower sealing plate (343) slides through the lower isolation plate (346) and connects to the lower fixing plate (31).

8. A construction method for a vibration-damping steel structure bridge according to claim 7, characterized in that, A first cavity (35) is formed between the upper sealing plate (342) and the upper isolation plate (345), a second cavity (36) is formed between the upper sealing plate (342) and the lower sealing plate (343), and a third cavity (37) is formed between the lower sealing plate (343) and the lower isolation plate (346). The second cavity (36) is filled with a damping medium (38). Both the upper sealing plate (342) and the lower sealing plate (343) are provided with a plurality of connecting holes (3421).

9. A construction method for a vibration-damping steel structure bridge according to claim 8, characterized in that, The outer side of the bidirectional pull-out support (3) is fitted with a second sleeve (39), a limiting ring (391) is provided at the upper end of the second sleeve (39), and an abutment plate (392) is provided at the lower end of the second sleeve (39).

Images