A method for installing a multi-level hanging steel structure

Abstract

The present invention relates to a method for installing a multi-level under-hanging steel structure, comprising the following steps: S1, installation of the lower chord steel beam of the theater auditorium truss: during the installation of the lower chord steel beam of the theater auditorium truss, the steel beam is precisely aligned and fixed to ensure installation accuracy and stability, and the structure is adjusted to meet the requirements of the specification through horizontal and vertical deviation inspections, and the reinforcement and installation process of the beam is comprehensively inspected. The present invention enhances structural stability by precisely hoisting and installing the theater complex building, meets protection standards such as anti-corrosion, insulation and waterproofing, handles structural joints, ensures the continuity and stability of the overall structure, conducts stability inspections, and promptly repairs or reinforces problems. Through comprehensive review and testing methods, it is ensured that the installation and connection meet the design and specification requirements, enhances the operability and economic benefits of the project, protects the civil structure, improves installation accuracy, reduces maintenance costs, and improves the reliability and safety of the overall project.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure installation, and in particular to a method for installing a multi-level bottom-hanging steel structure. Background Art

[0002] With the continuous advancement of economy and technology, multi-level under-hung steel structures have gradually become a new trend in the interior design of large theaters.

[0003] However, the current structural design faces some technical challenges during the installation process, such as: 1. Subsequent construction restrictions after the completion of the roof steel structure and lack of sufficient working platforms; 2. Large volume of hanging components, numerous installation levels and long construction period; 3. Complex spatial cross-construction and the inability to use conventional lifting machinery also bring difficulties to the construction process; 4. High installation accuracy requirements and poor control of on-site construction. In order to deal with these problems, technicians in this field have proposed an innovative installation method for multi-level hanging steel structures. Summary of the invention

[0004] In view of the above problems existing in the prior art, the main purpose of the present invention is to provide a method for installing a multi-level bottom-hanging steel structure.

[0005] The technical solution of the present invention is as follows: a method for installing a multi-level bottom-hanging steel structure comprises the following steps:

[0006] S1. Installation of the lower chord steel beam of the theater auditorium truss: During the installation of the lower chord steel beam of the theater auditorium truss, the steel beam is accurately aligned and fixed to ensure installation accuracy and stability. Through horizontal and vertical deviation inspections, the structure is adjusted to meet the requirements of the specifications, and the reinforcement and installation process of the beam is comprehensively inspected to ensure a reliable and stable installation effect; S2. Installation of the light-chasing bridge: The installation of the light-chasing bridge is carried out through the assembly of lifting units and hoisting with winches, and temporary measures are taken to strengthen the structural rigidity to ensure the safety of the installation process. The embedded steel beams on both sides and the middle of the light-chasing bridge are installed in an orderly manner, strictly in accordance with engineering requirements and safety specifications, to maintain the stability of the overall structure; S3. Installation of the surface light bridge and related structures: When installing the surface light bridge and related structures, they are hoisted with winches according to the assembly units to ensure To ensure effective space utilization and accurate positioning during the construction process, steel grilles, folding beam stairs and adjacent connecting steel beams are installed in sequence to ensure the integrity and safety of the structure; S4, pulley beam layer and 28m elevation grid top installation: the pulley beam layer and 28m elevation grid top are installed according to the decomposed lifting unit for winch hoisting and embedded steel beam installation to ensure the smooth completion of the overall connection. At the same time, steel grilles are installed step by step, and all connection points are checked and confirmed to be firmly connected to meet the engineering requirements and safety and stability standards; S5, overpass and staircase structure installation: the installation of overpass and staircase structure involves the stairs between the second and third overpasses and the connection of overpasses at different heights. Each overpass unit and closed-circuit staircase structure are installed in an orderly manner to ensure the integrity of the structure, smooth lighting channels and safety. During the installation process, strictly abide by the construction specifications and safety requirements; S6, main sound bridge and grid top installation: the main sound bridge and grid top are hoisted and installed by winch, steel grille is used to enhance the structural stability, airtight treatment is carried out at the joints and joints, and the integrity of each connection part is strictly verified and its stability is guaranteed to meet the acoustic requirements in the theater complex; S7, hoisting of the overpass and installation of stairs: when hoisting and installing the 14.25-meter and 19.25-meter overpasses, the hoisting units of the first and second overpasses are followed respectively. During the implementation process, the stairs and the overpasses parallel to the letter axis are connected, and the steel pier and the overpass at the bottom of the stairs are installed at the same time to ensure the firmness and safety of the structure; S8, overall stability and safety confirmation: a global inspection is carried out on the steel structure, connection points, stress concentration, etc. involved in the entire installation project to eliminate possible safety hazards. At the same time, quality acceptance is carried out on welding, bolt connections, etc., and the bearing capacity is verified, ultimately ensuring that the stability and safety of the steel structure are guaranteed to the greatest extent during the entire installation process.

[0007] As a preferred implementation, step S1 can be refined as follows: S11, preparation: familiarize yourself with the construction drawings, communicate with relevant engineering personnel, clarify the construction requirements, clean up the work site, and ensure that the working environment is clean and orderly. Verify that the quality and specifications of the materials are consistent with the drawings, and the steel beams should be kept dry during transportation and storage; S12, preparation before lifting: check the operating status of the tower crane equipment to ensure stability during lifting. Select appropriate hoists and lifting points, and select appropriate hoists according to the weight of the steel beam; inspect and clean the steel beam to ensure that there is no surface stains and rust; S13, hoisting positioning: use a tower crane to stably hang the steel beam and hoist it to the predetermined position, and adjust the position with manual assistance to ensure that the gap is appropriate and the installation accuracy is maintained; S14, anchoring and fixing: use bolts, nuts and other connectors to initially connect the steel beam to the foundation and column, and pre-tighten the nuts to form a stable connection structure between the steel beam, foundation and column; S15, deviation adjustment: use a level and a vertical ruler to check the horizontal and vertical deviations of the steel beam from the adjacent structure. If adjustment is required, the bolts, nuts and other connectors can be adjusted appropriately to meet the construction specifications; S16, structural reinforcement: strengthen the connection between the steel beam and the foundation and column, and finally tighten the nuts to make the steel beam reach a reliable and stable bearing capacity. Check the welding quality of the connection, and repair and grind the welds when necessary to ensure the stability of the structure. As a preferred implementation, step S2 can be subdivided into: S21, assembly of segments and columns: the work team assembles the light-chasing bridge on site according to the construction drawings, and assembles the components according to the design requirements to form a unit to be hoisted. This ensures that all parts of the bridge fit together properly without the need for additional fine-tuning; S22, hoisting the light-chasing bridge unit: use a winch to hoist the assembled light-chasing bridge units one by one, and the already equipped light-chasing bridge units must remain intact to ensure the stability and safety of the overall structure; S23, temporary stabilization measures: in order to improve the overall rigidity, temporary stabilization measures are required, and mortise and tenon joints must be performed as soon as possible to improve the stability of the bridge body; S24, installing the light-chasing bridges on both sides: the modular installation method can ensure safety and efficiency, and the light-chasing bridges on both sides are positioned and installed in sequence. Unit, ensure that the heights on both sides are consistent and meet the requirements of lateral and longitudinal inclination angles; S25, install the middle patch section steel beam: gradually add the middle patch section steel beam on both sides of the bridge, so that the chasing light bridge forms a stable support in the lateral and longitudinal directions; S26, structural stability check: after all parts are installed, a comprehensive stability check should be carried out, including monitoring of welding quality, joint tightness, stability of temporary measures and deviation of the overall structure, and take measures to make adjustments as needed to ensure the safety, stability and excellent performance of the entire chasing light bridge.

[0008] As a preferred implementation, step S3 can be refined as follows: S31, assembling the surface light bridge components in pieces: conducting a detailed review of the construction drawings and checking the components, splicing the surface light bridge components according to the set accessory number sequence, and ensuring that the interfaces of each component are tightly connected without gaps; S32, hoisting the surface light bridge units: according to the accessory numbers and construction sequence, use a winch to hoist the assembled surface light bridge units one by one. When the components are lifted to the designated position, a dedicated person is required to guide and fix them to prevent deviation; S33, installing steel grilles: during the installation of the second surface light bridge, install preset steel grilles to enhance rigidity and stability. The size, strength, and position of the steel grilles should be installed strictly in accordance with the design and construction drawings; S 34. Complete the installation of the first surface light bridge: confirm that all components of the first surface light bridge are fully in place and firmly installed. If necessary, use welding, bolts and other fixing methods to ensure that the joints are tight and the components are neatly arranged; S35. Install the folding beam stairs and their steel beams: install the steps, folding beams and steel beams connected to the surface light bridge in sequence, ensuring that each step of the construction meets the requirements of safety and precision. The bolted joints must be tightened, and the welds must be free of defects such as penetration, undercuts, and cracks; S36. Structural quality inspection: After the installation of each part is completed, conduct a comprehensive quality inspection in strict accordance with the design requirements and safety specifications, including but not limited to welding parts, bolted connections, overall deviations of steel structures, etc., and make adjustments when necessary to ensure that all installed structures are reliable and meet the requirements for use.

[0009] As a preferred embodiment, step S4 can be refined as follows: S41, steel structure decomposition and assembly: according to the construction drawings, the steel structure of the pulley beam layer and the 28m elevation fence top is decomposed into several hoistable units, and pre-assembled on the ground to ensure that the size and structure of the components meet the design requirements and avoid problems during high-altitude operations; S42, hoisting the pulley beam layer unit: hoist the pulley beam layer unit to the designated position in sections using a winch, and perform parallel and vertical positioning. During the hoisting process, maintain a steady lift to ensure construction safety and keep the joint position within a suitable range; S43, install the patching section steel beam: install the steel beam to connect each hoisting unit to form the support structure of the pulley beam layer and the 28m elevation fence top. Ensure that the connection of the patching section steel beam is stable and install it strictly in accordance with the design requirements; S44, hoisting of the elevation fence top unit: use the quartering method to divide the 28m elevation fence top into four units, and use a winch for hoisting. Hoisting in units can reduce the difficulty and risk of hoisting and improve construction efficiency; S45. Install steel grilles: While hoisting, install steel grilles at appropriate positions on the top of the 28m elevation fence. The size, strength and position of the steel grilles should be installed strictly in accordance with the design and construction drawings to ensure overall stability and safety; S46. Check and fix the connection points: After all parts are hoisted, conduct a detailed inspection of the connection points of the entire pulley beam layer and the top of the 28m elevation fence to ensure that the connection is stable and correct. Check whether the bolt connection is tight and whether the weld is firm and sufficient. If there is any abnormality, make corresponding adjustments or repairs in time.

[0010] As a preferred implementation, step S5 can be refined as follows: S51, install the third overpass stairs: follow the construction drawings and design specifications, and install the staircase components between the third overpass and the top of the fence in sequence. Ensure that the stair steps are firmly connected to the beam structure to meet the design and use requirements; S52, install the 24.25m elevation overpass unit: hoist the pre-assembled third overpass unit to the designated position at an elevation of 24.25m according to the component number and installation sequence. Ensure that the overpass components are flat and stable, and the welding parts are firm; S53, install the steel grille: according to the design requirements, install the steel grille at the appropriate position to ensure the rigidity and integrity of the third overpass structure. The material, size and installation position of the steel grille must be consistent with the design drawings to meet the stability and safety requirements; S54, install the 19.2m elevation overpass unit: operate according to the winch specifications and hoist the second overpass unit to the designated position at an elevation of 19.2m. Carefully calibrate the position of the overpass to ensure that it is aligned horizontally and vertically, and that the joint position meets the construction requirements; S55, Connecting stairs: Install the staircase structure between the second and third overpasses, following the set installation sequence, and ensure that the stair rails, steps and guardrails are stable. At the same time, check all connection points to ensure that the connection is stable and meets the design and use requirements; S56, Structural integrity and safety inspection: After completing the installation of the overpass and staircase structure, conduct a comprehensive quality inspection. Verify that there are no problems with key parts such as welds and bolt connections to ensure the overall stability and safety of the overpass and stairs. If there are any abnormalities, make adjustments or repairs immediately.

[0011] As a preferred implementation, step S6 can be refined as follows: S61, hoisting the main sound bridge unit: operate the winch to lift the pre-assembled main sound bridge unit from the ground to the designated position. Maintain a stable lifting speed during the hoisting process to avoid swinging or collision, and ensure that each main sound bridge unit is aligned and in accordance with the position and direction specified in the design drawings; S62, installing the steel grille of the reinforced structure: when the main sound bridge unit is hoisted into place, the steel grille is installed simultaneously. Each steel grille should be prefabricated and installed in strict accordance with the dimensions of the design drawings, in order to enhance the stability of the main sound bridge structure and ensure that the connection between them is aligned and firm; S63, installing and fixing the grid top: install the grid top component on the main sound bridge according to the construction sequence and position, and use special tools and accessories to ensure that it is level and fixed and stable. During the installation process, apply force evenly to avoid deformation or damage to the structure; S64, structural docking and joint treatment: After completing the installation of the main sound bridge and the grid top unit, perform the docking work at the structural joints, including welding or tightening the bolts at the joints to ensure that the connection between the entire installation unit is correct and firm and reliable; S65, stability check: Perform a comprehensive stability check on the installed main sound bridge unit and the grid top, and evaluate the strength of the welded joints, bolted connections and the overall structure. If any problems are detected, such as poor welding or loose bolts, they must be repaired or re-reinforced immediately; S66, final structural confirmation: After the structural stability check, the person in charge needs to make a final confirmation, through various detection methods, including visual inspection, stress monitoring and connection strength testing, to ensure that all component installations and connections meet the design requirements and engineering specifications, and no structural defects are found.

[0012] As a preferred implementation, step S7 can be refined as follows: S71, installation of the 14.25-meter overpass hoisting unit 1: according to the construction drawings and design plan, use a winch to hoist the first unit of the prefabricated overpass to an elevation of 14.25 meters. During the hanging process, the stability of the winch and the accurate alignment of the unit components must be ensured; S72, advance preparation and installation of stairs: pre-assemble the stair components, and then install them between the overpass between 14.25 meters and 19.25 meters. The structural integrity of the stairs must be ensured, and their position, inclination angle and direction must strictly comply with the design drawings; S73, installation of the 14.25-meter overpass hoisting unit 2: use a winch to hoist the second unit of the overpass to an elevation of 14.25 meters according to the design plan and the instructions on the construction drawings. The stability of the winch and the accurate alignment and firm connection of the unit components must be ensured; S74. Installation of the overpass parallel to the letter axis: Three winches are called to synchronously hang and install the overpass parallel to the letter axis. The winch should remain stable throughout the process, and the hoisted unit parts must be fully aligned after installation; S75. Synchronous installation of the steel pier and the lower overpass of the stairs: According to the design plan and construction drawings, the installation of the steel pier and the lower overpass of the stairs should be carried out simultaneously. It must be ensured that all installation units are carried out as described and that all connection parts are firm and reliable; S76. Confirmation of structural firmness and safety: After all overpasses and stairs are installed, a comprehensive structural inspection is carried out, including the welding quality of the connection parts, the joint strength of the bolts, etc. This is to ensure that all installed structural elements are firm, stable and safe. If there are any problems, they must be rectified immediately.

[0013] As a preferred implementation, step S8 can be refined as follows: S81, component inspection: conduct a comprehensive visual and physical inspection of all installed components to ensure that all parts are installed in strict accordance with design parameters and construction specifications. This includes checking whether protective measures such as anti-corrosion, insulation and waterproofing are in place; S82, potential stress inspection: use stress detectors and other related equipment to perform stress tests on all joints, welds and pressure-bearing surfaces of all structures. If stress concentration or excess is found, the relevant parts need to be adjusted to ensure overall stability;

[0014] S83. Quality acceptance: Conduct quality acceptance of details such as welding and bolting, and conduct non-destructive testing on welds to confirm that their quality meets the engineering requirements. Perform tensile tests on nuts and bolts to ensure their connection strength; S84. Load test: Conduct a comprehensive structural load test to verify the bearing capacity of each component and the stability of the overall structure by simulating the load conditions of actual working conditions to ensure its safety during construction and use; S85. Confirmation of safety measures: Check and confirm that all safety facilities and measures have been completed and comply with relevant safety regulations. This includes safety notices, guardrails, protective equipment, etc., as well as personal protective equipment for workers; S86. Record and track problems: Record all problems that may arise during construction in detail, including the date, location, participants, problem description, and solutions. And do a good job of tracking and acceptance of problems to provide a basis for subsequent quality audits and improvements.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are:

[0016] The present invention enhances the structural stability by accurately hoisting and installing the theater complex building, meets the protection standards such as anti-corrosion, insulation and waterproofing, handles the structural joints, ensures the continuity and stability of the overall structure, conducts stability inspections, and promptly repairs or reinforces problems. Through comprehensive review and testing methods, it is ensured that the installation and connection meet the design and specification requirements, enhances the operability and economic benefits of the project, protects the civil structure, improves the installation accuracy, reduces maintenance costs, and improves the reliability and safety of the overall project. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the overall operation steps of the present invention;

[0018] Figure 2 is a flow chart of step S1 of the present invention;

[0019] Figure 3 is a flow chart of step S2 of the present invention;

[0020] Figure 4 is a flow chart of step S3 of the present invention;

[0021] Figure 5 is a flow chart of step S4 of the present invention;

[0022] Figure 6 is a flow chart of step S5 of the present invention;

[0023] Figure 7 is a flow chart of step S6 of the present invention;

[0024] Figure 8 is a flow chart of step S7 of the present invention;

[0025] Fig. 9 is a flow chart of step S8 of the present invention;

[0026] Fig.10 This is a model diagram of a multi-level bottom-hanging steel structure of the present invention;

[0027] Fig.11 It is a cross-sectional view of the installation of the pulley beam layer of the present invention;

[0028] Fig.12 It is a cross-sectional view of the grid top hoisting of the present invention;

[0029] Fig.13 It is a cross-sectional view of the stair installation of the present invention;

[0030] Fig.14 It is a cross-sectional view of the installation of the third overpass of the present invention;

[0031] Fig.15 It is a cross-sectional view of the installation of the second overpass of the present invention;

[0032] Fig.16 This is a cross-sectional view of the first overpass installation of the present invention;

[0033] Fig.17 The plan view of the steel dock installation of the present invention. DETAILED DESCRIPTION Example

[0034] like Figure 1-Figure 17 As shown, the present invention provides a method for installing a multi-level bottom-hanging steel structure, comprising the following steps:

[0035] S1. Installation of the lower chord steel beam of the theater auditorium truss: During the installation of the lower chord steel beam of the theater auditorium truss, accurately align and fix the steel beam to ensure installation accuracy and stability. Through horizontal and vertical deviation inspection, adjust the structure to meet the requirements of the specification, and conduct a comprehensive inspection of the reinforcement and installation process of the beam to ensure a reliable and stable installation effect; S11. Preparation: Familiar with the construction drawings, communicate with relevant engineering personnel, clarify the construction requirements, clean up the work site, and ensure that the working environment is clean and orderly. Verify that the quality and specifications of the materials are consistent with the drawings, and keep the steel beams dry during transportation and storage; S12. Preparation before hoisting: Check the operating status of the tower crane equipment to ensure stability during hoisting. Select appropriate hoists and lifting points, and select appropriate hoists according to the weight of the steel beam; inspect and clean the steel beam to ensure that there is no surface stains and rust; S13, hoisting positioning: use a tower crane to stably hang the steel beam and hoist it to the predetermined position, and adjust the position with manual assistance to ensure that the gap is appropriate and the installation accuracy is maintained; S14, anchoring and fixing: use bolts, nuts and other connectors to initially connect the steel beam to the foundation and column, and pre-tighten the nuts to form a stable connection structure between the steel beam, foundation and column; S15, deviation adjustment: use a level and a vertical ruler to check the horizontal and vertical deviations of the steel beam from the adjacent structure. If adjustment is required, the bolts, nuts and other connectors can be adjusted appropriately to meet the construction specifications; S16, structural reinforcement: strengthen the connection between the steel beam and the foundation and column, and finally tighten the nuts to make the steel beam reach a reliable and stable bearing capacity. Check the welding quality of the connection, and repair and grind the welds when necessary to ensure the stability of the structure.

[0036] In summary; the multi-level under-hanging steel structure installation method is a precise and stable engineering process to ensure the correct installation of the lower chord steel beam of the theater auditorium truss. From familiarizing yourself with the construction drawings, preparing the site and materials, to hoisting positioning, anchoring, deviation adjustment and structural reinforcement, the entire process emphasizes high precision, stability and code compliance. This method can effectively improve the overall stability and durability of the structure, reduce the need for future maintenance and adjustments, and meet safety standards, ensuring that the steel beams can stably bear loads and prevent future structural failures.

[0037] S2. Installation of the light-chasing bridge: The light-chasing bridge is installed by assembling the hoisting unit and hoisting with a winch, and temporary measures are taken to strengthen the structural rigidity to ensure the safety of the installation process. The steel beams of the embedded sections on both sides and the middle of the light-chasing bridge are installed in an orderly manner, strictly in accordance with the engineering requirements and safety specifications to maintain the stability of the overall structure; S21. Assembly of segments and columns: The work team assembles the light-chasing bridge on site according to the construction drawings, and assembles the components according to the design requirements to form units to be hoisted. In this way, it can be ensured that all parts of the bridge are properly coordinated without the need for additional fine-tuning; S22. Hoisting of the light-chasing bridge unit: The assembled light-chasing bridge units are hoisted one by one by the winch. The light-chasing bridge units that have been equipped must remain intact to ensure the stability and safety of the overall structure; S23. Temporary stabilization measures: In order to improve the overall rigidity, temporary stabilization measures are required, and mortise and tenon joints are performed as soon as possible to improve the stability of the bridge body; S24. Installation of the light-chasing bridges on both sides: The modular installation method can ensure safety and efficiency. The light-chasing bridges on both sides are positioned and installed in sequence. Unit, ensure that the heights on both sides are consistent and meet the requirements of lateral and longitudinal inclination angles; S25, install the middle patch section steel beam: gradually add the middle patch section steel beam on both sides of the bridge, so that the chasing light bridge forms a stable support in the lateral and longitudinal directions; S26, structural stability check: after all parts are installed, a comprehensive stability check should be carried out, including monitoring of welding quality, joint tightness, stability of temporary measures and deviation of the overall structure, and take measures to make adjustments as needed to ensure the safety, stability and excellent performance of the entire chasing light bridge.

[0038] In summary: the light chasing bridge installation procedure is an engineering process that comprehensively considers safety and structural stability. It involves assembling the segments and columns, hoisting the light chasing bridge unit, setting up temporary stability measures, sequentially installing the light chasing bridges on both sides and the middle embedded steel beam, and finally conducting a comprehensive stability check. Precise processes and strict safety regulations allow the various parts of the light chasing bridge to fit together correctly, thereby reducing errors and repairs. In addition, modular installation improves efficiency and safety, and temporary measures ensure stability throughout the installation process. The final stability check also ensures the safety, stability and excellent performance of the entire light chasing bridge, improving its reliability and durability in future use.

[0039] S3. Installation of the surface light bridge and related structures: When installing the surface light bridge and related structures, they are hoisted by hoisting according to the assembly units to ensure effective space utilization and accurate positioning during the construction process. The steel grilles, folding beam stairs and their adjacent connecting steel beams are installed in sequence to ensure the integrity and safety of the structure;

[0040] S31. Assemble the surface light bridge components piece by piece: Conduct detailed construction drawing review and component verification, and assemble the surface light bridge components according to the set accessory number sequence, while ensuring that the interface of each component is tightly connected without gaps;

[0041] S32, hoisting the surface light bridge unit: according to the accessory number and construction sequence, use the winch to hoist the assembled surface light bridge units one by one. When the components are lifted to the designated position, a dedicated person is required to guide and fix them to prevent deviation;

[0042] S33. Install steel grille: During the installation of the second surface light bridge, install the preset steel grille to enhance the rigidity and stability. The size, strength and position of the steel grille should be installed strictly in accordance with the design and construction drawings;

[0043] S34. Complete the installation of the first surface light bridge: Confirm that all components of the first surface light bridge are fully in place and firmly installed. If necessary, use welding, bolts and other fixing methods to ensure that the joints are tight and the components are neatly arranged;

[0044] S35. Install folding beam stairs and their steel beams: Install the steps, folding beams and steel beams connected to the surface bridge in sequence, ensuring that each step of construction meets the requirements of safety and accuracy. Bolt joints must be tightened and welds must be free of defects such as penetration, undercuts, cracks, etc.

[0045] S36. Structural quality inspection: After the installation of each part is completed, a comprehensive quality inspection shall be carried out in strict accordance with the design requirements and safety specifications, including but not limited to welding parts, bolt connections, overall deviations of steel structures, etc. Adjustments shall be made when necessary to ensure that all installed structures are reliable and meet the requirements of use.

[0046] In summary: The key points of the installation of the surface light bridge and related structures are to ensure the precise lifting and sequential installation of the assembly units, aiming to optimize the use of space and ensure accurate component positioning. The piece-by-piece assembly of the surface light bridge components is carried out through meticulous component verification and numbering sequence to achieve tight interface connections without gaps. The lifting of the surface light bridge units one by one requires strict adherence to the numbering and construction sequence, as well as precise fixation in designated positions. During the installation, the addition of steel grilles and folding beam stairs further strengthened the rigidity and stability of the structure, ensuring the neatness and firmness of the overall structure. The final structural quality inspection ensures the quality of welding, bolting, and overall compliance to achieve reliable use and high performance standards. Through these optimized steps, the efficiency, safety and engineering quality of the installation process are improved, while saving material and labor costs and enhancing the durability and maintainability of the structure.

[0047] S4, installation of pulley beam layer and 28m elevation grid top: The pulley beam layer and 28m elevation grid top are hoisted by winch and installed with embedded steel beam according to the decomposed hoisting unit to ensure the smooth completion of the overall connection. At the same time, the steel grid is installed step by step, and all connection points are checked and confirmed to be firmly connected to meet the engineering requirements and safety and stability standards;

[0048] S41. Decomposition and assembly of steel structure: Decompose the steel structure of the pulley beam layer and the 28m elevation fence top into several hoistable units according to the construction drawings, and pre-assemble them on the ground to ensure that the size and structure of the components meet the design requirements to avoid problems during high-altitude operations;

[0049] S42, hoisting the pulley beam layer unit: hoist the pulley beam layer unit to the designated position in sections using a winch, and perform parallel and vertical positioning. During the hoisting process, maintain a steady lifting to ensure construction safety and keep the joint position within an appropriate range;

[0050] S43, install the steel beams of the patching section: install the steel beams to connect the lifting units to form the support structure of the pulley beam layer and the top of the 28m elevation fence. Ensure that the connection of the steel beams of the patching section is stable and install it strictly according to the design requirements;

[0051] S44, hoisting of the grid top in units: the 28m grid top is divided into four units by the quartering method and hoisted by a winch. Hoisting in units can reduce the difficulty and risk of hoisting and improve construction efficiency;

[0052] S45. Install the steel grille: During the hoisting process, install the steel grille at the appropriate position on the top of the fence at an elevation of 28m. The size, strength and position of the steel grille should be strictly installed in accordance with the design and construction drawings to ensure overall stability and safety;

[0053] S46, Check and fix the connection points: After all parts are hoisted, conduct a detailed check on the connection points of the entire pulley beam layer and the 28m elevation fence top to ensure that the connection is stable and correct. Check whether the bolt connection is tight and whether the weld is firm and sufficient. If there is any abnormality, make corresponding adjustments or repairs in time.

[0054] In summary: The core of the installation of the pulley beam layer and the 28m elevation fence top steel structure lies in the meticulous decomposition, assembly and hoisting to ensure the safety, accuracy and efficiency during the construction process. First, pre-assembly is carried out on the ground to ensure that the size and structure of the components are appropriate, thereby reducing the risk of high-altitude construction. The hoisting pulley beam layer unit and the 28m elevation fence top are installed in sections and quarters, which effectively reduces the difficulty of hoisting and improves construction efficiency. Steel grids are added during the installation to ensure overall stability. Finally, the connection points are thoroughly checked and fixed to ensure the quality and safety of the connection points. The entire process follows strict engineering logic and adopts safe and reliable methods to achieve high-quality results. Through this series of operations, the safety, efficiency, quality and durability of the overall construction process are significantly improved.

[0055] S5. Installation of skybridge and staircase structures: The installation of skybridge and staircase structures involves the connection of stairs between the second and third skybridges and skybridges at different heights. Each skybridge unit and closed-circuit staircase structure is installed in an orderly manner to ensure structural integrity, smooth lighting channels and safety. During the installation process, strictly abide by construction specifications and safety requirements;

[0056] S51. Install the third overpass staircase: follow the construction drawings and design specifications to install the staircase components between the third overpass and the top of the fence in sequence. Ensure that the staircase steps are firmly connected to the beam structure to meet the design and use requirements;

[0057] S52, Install the 24.25m elevation overpass unit: According to the component number and installation sequence, hoist the pre-assembled third overpass unit to the designated position at 24.25m elevation. Ensure that the overpass components are flat and stable, and the welding parts are firm;

[0058] S53. Install steel grilles: Install steel grilles at appropriate locations according to design requirements to ensure the rigidity and integrity of the third overpass structure. The material, size and installation location of the steel grilles must be consistent with the design drawings to meet stability and safety requirements;

[0059] S54, Install the 19.2m elevation overpass unit: According to the hoisting machine specification, hoist the second overpass unit to the designated position at the 19.2m elevation. Carefully calibrate the overpass position to ensure that it is aligned horizontally and vertically, and the joint position meets the construction requirements;

[0060] S55, connecting stairs: install the staircase structure between the second and third overpasses in the set installation sequence, ensuring that the stair rails, steps and guardrails are stable. At the same time, check all connection points to ensure that the connection is stable and meets the design and use requirements;

[0061] S56. Structural integrity and safety inspection: After the installation of the bridge and staircase structure is completed, a comprehensive quality inspection is carried out. Verify that there are no problems with key parts such as welds and bolt connections to ensure the overall stability and safety of the bridge and staircase. If there are any abnormalities, make adjustments or repairs immediately.

[0062] To sum up: the key points are the orderly installation and safety inspection of the overpass and staircase structures to achieve effective space utilization, build a stable structure, and ensure unobstructed access. First, the installation of each staircase component and overpass unit is carried out according to the construction drawings and design specifications. Secondly, steel grids are added in appropriate locations to strengthen the rigidity and integrity of the overpass structure. During the installation process, the component numbers and installation sequence are strictly followed to ensure the stability of the overpass components and the accuracy of the docking. Finally, a comprehensive structural integrity and safety inspection is carried out to ensure the quality and safety of the connection parts. The logic and accuracy of this set of workflows help ensure the successful completion of the project, while optimizing installation efficiency, improving work safety and reducing the need for post-maintenance.

[0063] S6. Installation of main sound bridge and grid top: The main sound bridge and grid top are hoisted and installed by winch respectively. Steel grid is used to enhance the structural stability. Airtight treatment is performed at the joints and seams. The integrity of each connection part is strictly verified and its stability is guaranteed to meet the acoustic requirements in the theater complex building.

[0064] S61. Hoisting the main sound bridge unit: Operate the winch to lift the pre-assembled main sound bridge unit from the ground to the designated location. During the hoisting process, maintain a stable lifting speed to avoid swinging or collision, and ensure that each main sound bridge unit is aligned and in accordance with the position and direction specified in the design drawings;

[0065] S62. Install the steel grilles for the reinforcement structure: When the main sound bridge unit is hoisted into place, the steel grilles are installed simultaneously. Each steel grille should be prefabricated and installed strictly according to the dimensions of the design drawings, in order to enhance the stability of the main sound bridge structure and ensure that the connections between them are aligned and firm;

[0066] S63. Install and fix the top of the grid: Install the top of the grid on the main sound bridge according to the construction sequence and position, and use special tools and accessories to ensure that it is level and fixed stably. During the installation process, apply force evenly to avoid deformation or damage to the structure;

[0067] S64, structural joint and joint processing: After completing the installation of the main sound bridge and the grid top unit, perform the joint work at the structural joint, including welding or tightening bolts on the joint to ensure that the connection between the entire installation unit is correct, firm and reliable;

[0068] S65, Stability Check: Perform a comprehensive stability check on the installed main sound bridge unit and grille top, assessing the strength of the welded joints, bolted connections and overall structure. If any problems are detected, such as poor welding or loose bolts, they must be repaired or re-reinforced immediately;

[0069] S66. Final structural confirmation: After the structural stability check, the person in charge needs to conduct a final confirmation through various inspection methods, including visual inspection, stress monitoring and connection strength testing, to ensure that all component installations and connections comply with design requirements and engineering specifications, and no structural defects are found.

[0070] In summary: The entire process of installing the main sound bridge and the top of the grid involves the hoisting of each unit, the installation and reinforcement of the steel grille, the treatment of the joints, and the stability check and final confirmation after completion. The entire workflow is designed to ensure that the installation of each part is smooth and the structure is stable to meet the acoustic requirements in the theater complex. By operating the winch, the pre-assembled main sound bridge unit is smoothly lifted to the designated position. At the same time, the steel grille is installed to increase the structural stability. The top of the grid is then installed on the main sound bridge and ensured to be level and stable. After the main installation is completed, the structural joints are treated, including welding and tightening, to ensure the stable connection of the entire unit. The overall stability is checked again, and any problems are immediately repaired or reinforced. Finally, a final confirmation is carried out through various testing methods to ensure that the installation and connection meet the design and specification requirements.

[0071] S7. Hoisting of overpass and installation of stairs: When hoisting and installing the 14.25m and 19.25m overpasses, proceed according to the hoisting units of the first and second overpasses respectively. During the implementation process, connect the stairs and the overpasses parallel to the letter axis, and install the steel pier and the overpass at the bottom of the stairs at the same time to ensure the firmness and safety of the structure; S71. Install the hoisting unit of the 14.25m overpass: According to the construction drawings and design plan, use the winch to hoist the prefabricated first overpass unit to the elevation of 14.25 meters. During the hoisting process, the stability of the winch and the accurate alignment of the unit components must be ensured; S72. Pre-preparation and installation of stairs: Pre-assemble the staircase components and then install them between the overpasses between 14.25 meters and 19.25 meters. The structural integrity of the stairs must be ensured, and their position, inclination angle and direction must be strictly consistent with the design drawings; S73. Installation of the second unit of the 14.25-meter overpass: Use the winch to hoist the second unit of the overpass to the elevation of 14.25 meters according to the design plan and the instructions on the construction drawings. The stability of the winch and the accurate alignment and firm connection of the unit components must be ensured; S74. Installation of the overpass parallel to the letter axis: Call three winches to simultaneously hang and install the overpass parallel to the letter axis. The winch should remain stable throughout the process, and the hoisted unit parts must be fully aligned after installation; S75. Synchronous installation of the steel pier and the lower overpass of the stairs: According to the design plan and construction drawings, the installation of the steel pier and the lower overpass of the stairs should be carried out simultaneously. It must be ensured that all installation units are carried out as described and all connection parts are firm and reliable; S76. Confirmation of structural firmness and safety: After all overpasses and stairs are installed, a comprehensive structural inspection is carried out, including the welding quality of the connection parts, the joint strength of the bolts, etc. This is to ensure that all structural elements are strong, stable and safe after installation. If there are any problems, they must be rectified immediately.

[0072] In summary: This process mainly includes the hoisting of the bridges of different units, the pre-assembly and installation of the stairs, the installation of the parallel letter axis bridges, the synchronous installation of the steel pier and the lower bridge of the stairs, and the comprehensive inspection of the structure after all the installations are completed to ensure that it is strong and safe. The important links include ensuring stable hoisting, accurate alignment of all parts, firmness and reliability of all connections, and comprehensive inspection of the structure. This process aims to ensure that the construction meets the requirements of high efficiency and high precision, and improve the quality and safety of the building. It is beneficial to speed up construction, improve construction accuracy, reduce subsequent maintenance costs, and reduce safety risks during construction.

[0073] S8. Confirmation of overall stability and safety: Conduct a global inspection of the steel structure, connection points, stress concentration, etc. involved in the entire installation project to eliminate possible safety hazards. At the same time, conduct quality inspections on welding, bolt connections, etc., verify the bearing capacity, and ultimately ensure that the stability and safety of the steel structure are guaranteed to the greatest extent during the entire installation process; S81. Component inspection: Conduct a comprehensive visual and physical inspection of all installed components to ensure that all of their parts are installed in strict accordance with design parameters and construction specifications. This includes checking whether protective measures such as anti-corrosion, insulation and waterproofing are in place; S82. Potential stress inspection: Use stress detectors and other related equipment to perform stress tests on all joints, welds and pressure-bearing surfaces of all structures. If stress concentration or excess is found, the relevant parts need to be adjusted to ensure overall stability; S83. Quality acceptance: Conduct quality acceptance of details such as welding and bolt connections, and perform non-destructive testing on welds to confirm that their quality meets the project requirements. Conduct tensile tests on nuts and bolts to ensure their connection strength; S84, Load test: Conduct comprehensive structural load tests to simulate actual working conditions to verify the bearing capacity of each component and the stability of the overall structure to ensure its safety during construction and use; S85, Safety measures confirmation: Check and confirm that all safety facilities and measures have been completed and comply with relevant safety regulations. This includes safety notices, guardrails, protective equipment, etc., as well as personal protective equipment for workers;

[0074] S86. Record and track problems: Keep detailed records of all problems that may occur during the construction process, including the date, location, participants, problem description, and solutions. And do a good job of tracking and accepting problems to provide a basis for subsequent quality audits and improvements. In summary, this step aims to conduct a comprehensive inspection of the entire structure to identify and eliminate potential hidden dangers and ensure the stability and safety of the steel structure during installation, including visual and physical inspections of components; stress inspections using stress detectors; quality acceptance of welding and bolt connections; structural load tests to confirm bearing capacity and stability; confirmation of safety measures and facilities, and detailed recording and tracking of problems. The logic of this step is that after the structure is installed, multi-level inspections and tests are performed to identify any potential defects or risk points. Such structural assessments and quality control can ensure the long-term stability and safety of the structure. Its advantages include preventive fault repairs, ensuring construction quality, providing detailed records for future maintenance and problem solving, reducing later maintenance costs, avoiding potential personnel safety risks, and improving the reliability of the overall project.

[0075] As shown in the figure, this workflow first executed the precise hoisting and installation of the main sound bridge and overpass of the theater complex, including the addition of steel grilles and fixed grid tops to enhance structural stability and ensure that the installation complies with protection standards such as anti-corrosion, insulation and waterproofing. Then, detailed treatment was carried out around the structural joints, including welding and tightening bolts, to ensure the continuity and stability of the overall structure. After the main installation was completed, the installation structure was carefully checked for stability, and the problems found were promptly repaired or reinforced. Finally, through comprehensive review and the use of various detection methods, it was ensured that the installation and connection of all parts met the design and specification requirements. The implementation of this workflow enhanced the operability of the project, improved the installation efficiency and economic benefits, and through optimized quality control, the existing civil structure was protected and the installation accuracy was better guaranteed, thereby reducing the residual stress caused by deformation. The reasonable distribution of structural forces ensured the stability and safety of the installation stage and the use process. At the same time, through enhanced problem recording and tracking, maintenance costs were reduced and the reliability and safety of the overall project were improved.

[0076] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for installing a multi-level hanging steel structure, characterized in that: The following steps are involved: S1. Installation of lower chord steel beams of the theater auditorium truss: During the installation of the lower chord steel beams of the theater auditorium truss, the steel beams are accurately aligned and fixed to ensure installation accuracy and stability. The structure is adjusted to meet the requirements of the specifications through horizontal and vertical deviation inspections, and the reinforcement and installation process of the beams are fully inspected to ensure a reliable and stable installation effect; S2. Installation of the light-chasing bridge: The light-chasing bridge is installed by assembling the lifting unit and hoisting with a winch, and temporary measures are taken to strengthen the structural rigidity to ensure the safety of the installation process. The steel beams of the embedded sections on both sides and the middle of the light-chasing bridge are installed in an orderly manner, strictly in accordance with the engineering requirements and safety regulations, to maintain the overall structural stability; S3. Installation of the surface light bridge and related structures: When installing the surface light bridge and related structures, they are hoisted by hoisting according to the assembly units to ensure effective space utilization and accurate positioning during the construction process. The steel grilles, folding beam stairs and their adjacent connecting steel beams are installed in sequence to ensure the integrity and safety of the structure; S4, installation of pulley beam layer and 28m elevation grid top: The pulley beam layer and 28m elevation grid top are hoisted by winch and installed with embedded steel beam according to the decomposed hoisting unit to ensure the smooth completion of the overall connection. At the same time, the steel grid is installed step by step, and all connection points are checked and confirmed to be firmly connected to meet the engineering requirements and safety and stability standards; S5. Installation of skybridge and staircase structures: The installation of skybridge and staircase structures involves the connection of stairs between the second and third skybridges and skybridges at different heights. Each skybridge unit and closed-circuit staircase structure is installed in an orderly manner to ensure structural integrity, smooth lighting channels and safety. During the installation process, construction specifications and safety requirements are strictly followed; S6. Installation of main sound bridge and grid top: The main sound bridge and grid top are hoisted and installed by winch respectively. Steel grid is used to enhance the structural stability. Airtight treatment is performed at the joints and seams. The integrity of each connection part is strictly verified and its stability is guaranteed to meet the acoustic requirements in the theater complex building. S7, hoisting of overpass and installation of stairs: when hoisting and installing the 14.25m and 19.25m overpasses, follow the hoisting units of the first and second overpasses respectively. During the implementation, connect the stairs and the overpasses parallel to the letter axis, and install the steel pier and the overpass at the bottom of the stairs at the same time to ensure the firmness and safety of the structure; S8. Confirmation of overall stability and safety: Conduct a global inspection of the steel structure, connection points, and stress concentration involved in the entire installation project to eliminate possible safety hazards. At the same time, conduct quality inspection of welding and bolt connections and verify the bearing capacity to ultimately ensure that the stability and safety of the steel structure are guaranteed to the greatest extent during the entire installation process; Step S1 can be refined as follows: S11. Preparation: Be familiar with the construction drawings, communicate with relevant engineering personnel, clarify the construction requirements, clean the work site, and ensure that the working environment is clean and orderly; verify that the quality and specifications of the materials are consistent with the drawings, and keep the steel beams dry during transportation and storage; S12. Preparation before lifting: Check the operating condition of the tower crane equipment to ensure stability during lifting; select appropriate lifting equipment and lifting points, and select lifting equipment according to the weight of the steel beam; inspect and clean the steel beam to ensure there is no surface stains and rust; S13, Hoisting and positioning: Use a tower crane to stably hang the steel beam and hoist it to the predetermined position, and adjust the position with manual assistance to ensure appropriate gaps and maintain installation accuracy; S14. Anchoring and fixing: Use bolts and nuts to preliminarily connect the steel beam with the foundation and the column, and pre-tighten the nuts to form a stable connection structure between the steel beam, the foundation and the column; S15, Deviation adjustment: Use a level and a vertical ruler to check the horizontal and vertical deviations of the steel beams from the adjacent structures. If adjustments are necessary, adjust the bolts and nuts appropriately to meet the requirements of the construction specifications; S16. Structural reinforcement: Strengthen the connections between the steel beams and the foundations and columns, and finally tighten the nuts to ensure that the steel beams have a reliable and stable load-bearing capacity. Check the welding quality of the connections, and perform weld repairs and grinding to ensure the stability of the structure.

2. A method for installing a multi-level bottom-hanging steel structure according to claim 1, characterized in that: Step S2 can be subdivided into: S21. Assembly of segments and columns: The work team assembled the light-chasing bridge on site according to the construction drawings, assembled the components according to the design requirements, and formed units to be hoisted; this ensured that all parts of the bridge fit together properly without the need for additional fine-tuning; S22. Hoisting the light-chasing bridge unit: Use the winch to hoist the assembled light-chasing bridge units one by one. The assembled light-chasing bridge units must remain intact to ensure the stability and safety of the overall structure; S23, temporary stabilization measures: In order to improve the overall stiffness, temporary stabilization measures are needed, and mortise and tenon joints are made as soon as possible to improve the stability of the bridge body; S24. Install the light-chasing bridges on both sides: The modular installation method can ensure safety and efficiency. The units on both sides of the light-chasing bridge are positioned and installed in sequence to ensure that the heights on both sides are consistent and meet the requirements of the lateral and longitudinal inclination angles. S25. Install the middle patching steel beam: gradually add the middle patching steel beams on both sides of the bridge, so that the Zhuiguang Bridge forms a stable support in both the horizontal and vertical directions; S26. Structural stability check: After all parts are installed, a comprehensive stability check should be carried out, including monitoring the welding quality, joint tightness, stability of temporary measures and deviation of the overall structure, and taking measures to make adjustments as needed to ensure the safety, stability and excellent performance of the entire light chasing bridge.

3. A method for installing a multi-level bottom-hanging steel structure according to claim 1, characterized in that: Step S3 can be refined as follows: S31. Assemble the surface light bridge components piece by piece: Conduct detailed construction drawing review and component verification, and assemble the surface light bridge components according to the set accessory number sequence, while ensuring that the interface of each component is tightly connected without gaps; S32, hoisting the surface light bridge unit: according to the accessory number and construction sequence, use the winch to hoist the assembled surface light bridge units one by one. When the components are lifted to the designated position, a dedicated person is required to guide and fix them to prevent deviation; S33. Install steel grille: During the installation of the second surface light bridge, install the preset steel grille to enhance the rigidity and stability. The size, strength and position of the steel grille should be installed strictly in accordance with the design and construction drawings; S34. Complete the installation of the first surface light bridge: Confirm that all components of the first surface light bridge are fully in place and firmly installed, and use welding and bolting methods to ensure that the joints are tight and the components are neatly arranged; S35. Install folding beam stairs and their steel beams: Install the steps, folding beams and steel beams connected to the surface bridge in sequence, ensuring that each step of construction meets the requirements of safety and accuracy. Bolt joints must be tightened and welds must be free of penetration, undercuts and cracks; S36. Structural quality inspection: After the installation of each part is completed, a comprehensive quality inspection shall be carried out in strict accordance with the design requirements and safety specifications, including but not limited to welding parts, bolt connections, and overall deviations of the steel structure, and adjustments shall be made to ensure that all installed structures are reliable and meet the requirements of use.

4. The method for installing a multi-level bottom-hanging steel structure according to claim 1 is characterized in that: Step S4 can be refined as follows: S41. Decomposition and assembly of steel structure: Decompose the steel structure of the pulley beam layer and the 28m elevation fence top into several hoistable units according to the construction drawings, and pre-assemble them on the ground to ensure that the size and structure of the components meet the design requirements to avoid problems during high-altitude operations; S42, hoisting the pulley beam layer unit: hoist the pulley beam layer unit to the designated position in sections using a winch, and perform parallel and vertical positioning. During the hoisting process, maintain a steady lifting to ensure construction safety and keep the joint position within an appropriate range; S43, install the steel beams of the patching section: install the steel beams to connect the hoisting units to form the support structure of the pulley beam layer and the 28m elevation fence top; ensure that the connection of the steel beams of the patching section is stable and install it strictly according to the design requirements; S44, hoisting of the grid top in units: the 28m grid top is divided into four units by the quartering method and hoisted by a winch; hoisting in units can reduce the difficulty and risk of hoisting and improve construction efficiency; S45. Install the steel grille: During the hoisting process, install the steel grille at the appropriate position on the top of the fence at an elevation of 28m. The size, strength and position of the steel grille should be strictly in accordance with the design and construction drawings to ensure overall stability and safety. S46. Check and fix the connection points: After all parts are hoisted, conduct a detailed check on the connection points of the entire pulley beam layer and the 28m elevation fence top to ensure that the connection is stable and correct; check whether the bolt connection is tight and whether the weld is firm and sufficient; if there is any abnormality, make corresponding adjustments or repairs in time.

5. The method for installing a multi-level bottom-hanging steel structure according to claim 1 is characterized in that: Step S5 can be refined as follows: S51. Install the third overpass staircase: follow the construction drawings and design specifications to install the staircase components between the third overpass and the top of the fence in sequence; ensure that the staircase steps are firmly connected to the beam structure to meet the design and use requirements; S52, install the 24.25m elevation overpass unit: hoist the pre-assembled third overpass unit to the designated position at 24.25m elevation according to the component number and installation sequence; ensure that the overpass components are flat and stable, and the welding parts are firm; S53. Install steel grilles: Install steel grilles at appropriate locations according to design requirements to ensure the rigidity and integrity of the third overpass structure; the material, size and installation location of the steel grilles must be consistent with the design drawings to meet stability and safety requirements; S54, Install the 19.2m elevation overpass unit: operate the winch in accordance with the specifications, and hoist the second overpass unit to the designated position at the 19.2m elevation; carefully calibrate the overpass position to ensure that it is aligned horizontally and vertically, and that the joint position meets the construction requirements; S55, connecting stairs: install the staircase structure between the second and third overpasses in the set installation sequence, ensuring that the stair rails, steps and guardrails are stable; at the same time, check all connection points to ensure that the connection is stable and meets the design and use requirements; S56. Structural integrity and safety inspection: After the installation of the overpass and staircase structure is completed, a comprehensive quality inspection shall be carried out to verify that there are no problems with the welds and bolt connections at key locations to ensure the overall stability and safety of the overpass and stairs; if there are any abnormalities, adjustments or repairs shall be made immediately.

6. The method for installing a multi-level bottom-hanging steel structure according to claim 1 is characterized in that: Step S6 can be refined as follows: S61. Hoisting the main sound bridge unit: operate the winch to lift the pre-assembled main sound bridge unit from the ground to the designated location; maintain a stable lifting speed during the hoisting process to avoid swinging or collision, and ensure that each main sound bridge unit is aligned and in accordance with the position and direction specified in the design drawings; S62. Install the steel grilles for the reinforcement structure: When the main sound bridge unit is hoisted into place, the steel grilles should be installed simultaneously; each steel grille should be prefabricated and installed strictly according to the dimensions of the design drawings, in order to enhance the stability of the main sound bridge structure and ensure that the connections between them are aligned and firm; S63. Install and fix the top of the grid: Install the top of the grid on the main sound bridge according to the construction sequence and position, and use special tools and accessories to ensure that it is level and fixed stably; during the installation process, apply force evenly to avoid deformation or damage to the structure; S64, structural joint and joint processing: After completing the installation of the main sound bridge and the grid top unit, perform the joint work at the structural joint, including welding or tightening bolts on the joint to ensure that the connection between the entire installation unit is correct, firm and reliable; S65, Stability Check: Perform a comprehensive stability check on the installed main sound bridge unit and grille top, assessing the strength of the welded joints, bolted connections and overall structure; if any problems are detected, such as poor welding or loose bolts, they must be repaired or re-reinforced immediately; S66. Final structural confirmation: After the structural stability check, the person in charge needs to conduct a final confirmation through various inspection methods, including visual inspection, stress monitoring and connection strength testing, to ensure that all component installations and connections comply with design requirements and engineering specifications, and no structural defects are found.

7. The method for installing a multi-level bottom-hanging steel structure according to claim 1 is characterized in that: Step S7 can be refined as follows: S71. Install the first unit of the 14.25-meter overpass: According to the construction drawings and design plan, use the winch to hoist the first unit of the prefabricated overpass to the elevation of 14.25 meters; during the hoisting process, the stability of the winch and the accurate alignment of the unit must be ensured; S72. Pre-preparation and installation of stairs: Pre-assemble the staircase components and then install them between the footbridges at 14.25m and 19.25m; the structural integrity of the stairs must be ensured, and their position, inclination angle and direction must strictly comply with the design drawings; S73. Install the second unit of the 14.25-meter overpass: Use the winch to hoist the second unit of the overpass to the elevation of 14.25 meters according to the design plan and the instructions on the construction drawings; the stability of the winch and the accurate alignment and firm connection of the unit must be ensured; S74. Installation of overpass parallel to the letter axis: Three winches are used to simultaneously suspend and install the overpass parallel to the letter axis; the winches should remain stable throughout the process, and the hoisted unit parts should be fully aligned after installation; S75. Install the steel pier and staircase underpass simultaneously: Install the steel pier and staircase underpass simultaneously according to the design plan and construction drawings; ensure that all installation units are carried out as described and all connection parts are firm and reliable; S76. Confirmation of structural strength and safety: After all bridges and stairs are installed, a comprehensive structural inspection is carried out, including the welding quality of the connecting parts and the joint strength of the bolts; this is to ensure that all installed structural elements are strong, stable and safe; if there are any problems, they must be rectified immediately.

8. The method for installing a multi-level bottom-hanging steel structure according to claim 1 is characterized in that: Step S8 can be refined as follows: S81. Component inspection: Conduct a comprehensive visual and physical inspection of all installed components to ensure that all parts are installed strictly in accordance with the design parameters and construction specifications; this includes checking whether anti-corrosion, insulation and waterproofing protection measures are in place; S82. Potential stress check: Use stress detectors and other related equipment to perform stress tests on all joints, welds and pressure-bearing surfaces of all structures; if stress concentration or excess stress is found, relevant parts need to be adjusted to ensure overall stability; S83, Quality acceptance: Conduct quality acceptance of welding and bolt connection details, perform non-destructive testing on welds to confirm that their quality meets engineering requirements; perform tensile testing on nuts and bolts to ensure their connection strength; S84, Load test: Conduct comprehensive structural load tests to verify the bearing capacity of each component and the stability of the overall structure by simulating the load conditions of actual working conditions, so as to ensure its safety during construction and use; S85, Safety measures confirmation: Check and confirm that all safety facilities and measures have been completed and comply with relevant safety regulations, including safety notices, guardrails, protective equipment, and workers' personal protective equipment; S86. Record and track problems: Keep detailed records of all problems that may arise during the construction process, including the date, location, participants, problem description, and solutions; and do a good job of tracking and accepting problems to provide a basis for subsequent quality audits and improvements.

Images