Safe splicing and lifting method for asymmetric large-span steel corridor

Abstract

The invention provides a safe splicing and lifting method for an asymmetric large-span steel corridor, which belongs to the technical field of building construction and comprises the following steps: firstly, mounting a primary truss preassembled unit, hoisting and welding from two ends to the middle by using a crane in batches, and welding with a main body structure; the lifting platform is installed through a high-altitude bulk method and welded to the connecting rods and the main truss preassembling units, and a stable system is formed. And the position of a jig frame is determined on the ground of the installation position of the lifting units, and the lifting units of the corridor are installed above the jig frame step by step. After a lower lifting point lifting appliance, an upper lifting appliance and a steel strand are installed, a lifting and unloading strategy of lifting point oil pressure balance, structure posture adjustment, displacement synchronous control and sequential unloading in place is adopted, and a lifting unit and an after-loading unit are gradually lifted and installed in place. And finally, the hydraulic lifting system and related temporary measures are dismantled, and the installation work of the whole corridor is completed. The technical problem that it is difficult to ensure the installation precision under the safety condition in an existing method is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a method for safely splicing and lifting an asymmetric large-span steel corridor. Background Art

[0002] As a key technology in the field of building construction, corridor splicing and installation technology plays an increasingly important role in modern high-rise buildings and complex structural projects. With the acceleration of urbanization and the increasing innovation of architectural design, the application scenarios of large steel structure corridors are constantly expanding. Such corridors are not only used to connect adjacent buildings, but are also often used as iconic architectural elements to add unique charm to the city skyline. However, with the complexity of building structures and the improvement of construction requirements, traditional corridor installation methods face many challenges.

[0003] At present, there are two main methods for corridor installation: high-altitude bulk assembly of parts and overall hoisting. The high-altitude bulk assembly of parts is a method of hoisting components (small units or loose parts) to the designed position for direct assembly. This method usually extends from one end to the other along the longitudinal direction of the building. In some cases, scaffolding or steel column support is required on the ground for installation. The overall hoisting method is to assemble the grid structure into a whole on the ground according to the hoisting process requirements, and then use lifting equipment to lift the whole to the designed height, and then fix it in place after shifting in the air and locking the edges.

[0004] However, both methods have obvious defects in practical application. The high-altitude bulk method not only requires a lot of high-altitude assembly and welding work, which increases the safety risks of construction workers, but also the on-site machinery and equipment often cannot meet the lifting requirements. In addition, the cradle required for high-altitude assembly is difficult to set up, further increasing safety and quality risks. This method is difficult to construct and is not conducive to the safety, quality control and construction period management of on-site installation of steel structures.

[0005] Although the overall hoisting method can avoid some risks of high-altitude operations, in some cases, the main structure may not be able to be hoisted as a whole because of the pre-embedded components in the lifting section. In addition, during the hoisting process, since the steel segments need to be adjusted by cranes and manual labor, and it is an aerial operation and the tire frame cannot be accessed, the steel segments often shake, making accurate and rapid installation difficult. The use of cranes and manual visual adjustments is also prone to errors, increasing the danger and cycle of construction. In other words, the existing asymmetric large-span steel corridor installation and splicing methods are difficult to ensure installation accuracy under safe conditions. Summary of the invention

[0006] In view of this, the present invention provides a safe splicing and lifting method for an asymmetric large-span steel corridor, which can solve the technical problem that it is difficult to ensure installation accuracy under safe conditions in the existing asymmetric large-span steel corridor installation and splicing methods.

[0007] The present invention is achieved in that:

[0008] The present invention provides a method for safely splicing and lifting an asymmetric large-span steel corridor, which comprises the following steps:

[0009] S01. Divide the corridor into a main truss pre-installation unit, a lifting unit and a post-installation unit;

[0010] S02. Install the main truss pre-installed unit of the corridor: hoist and weld the components of the main truss pre-installed unit from both ends to the middle in batches by crane, place them on the brackets, and weld them to the pre-buried steel frame columns of the main structure;

[0011] S03. Install the lifting platform: Use the high-altitude bulk method to install the lifting platform, weld the lifting platform with the connecting rod and the main truss pre-installed unit to form a stable system;

[0012] S04. Install the tire frame: determine the tire frame installation position on the ground directly below the projection surface of the steel structure lifting unit installation position;

[0013] S05. Assemble the lifting unit of the corridor above the tire frame: install the lifting unit of the corridor step by step from bottom to top and from the middle to both sides;

[0014] S06, Lifting preparation: Install the lower lifting point sling, upper lifting sling and steel strand;

[0015] S07, Formal lifting: adopt the synchronous lifting and unloading position control strategy of oil pressure balance of lifting points, structural posture adjustment, synchronous displacement control, and sequential unloading and positioning;

[0016] S08. Installation of the lifting unit of the corridor: Use a crane to lift the supplementary section to the designed position and weld it with the lifting unit and pre-installed unit;

[0017] S09. Installation of rear-mounted units: lift and install the rear-mounted units in order from top to bottom;

[0018] S10. Unloading: The hydraulic lifting system equipment is depressurized synchronously until the steel strands are completely relaxed; the hydraulic lifting system equipment and related temporary measures are dismantled.

[0019] On the basis of the above technical solution, the safe splicing and lifting method of an asymmetric large-span steel corridor of the present invention can also be improved as follows:

[0020] Wherein, the step S01 specifically includes:

[0021] Step 101: Determine the segmented positions of the corridor according to the structural characteristics and construction requirements of the corridor;

[0022] Step 102, dividing the corridor into a main truss pre-installed unit, a lifting unit and a rear-installed unit, wherein the main truss pre-installed unit is located in the middle part of the corridor, the lifting units are located on both sides of the main truss pre-installed unit, and the rear-installed unit is located outside the lifting unit;

[0023] Step 103, according to the segmented location, prepare detailed construction drawings, including the specific size, connection method and installation sequence of each unit;

[0024] Step 104: Number each unit and formulate a corresponding installation plan to ensure that the connection and installation sequence between the units meet the engineering requirements.

[0025] Furthermore, the step S02 specifically includes:

[0026] Step 201: transport the components of the main truss pre-assembly unit to the construction site according to the construction drawings;

[0027] Step 202: Use a crane to hoist the components of the main truss pre-assembly unit from both ends to the middle in batches;

[0028] Step 203: weld the hoisted components according to the design requirements to ensure that the welding quality meets the engineering standards;

[0029] Step 204, placing the welded main truss pre-assembled unit on the pre-installed corbel;

[0030] Step 205, welding the main truss pre-installed unit to the pre-buried steel frame column of the main structure to ensure a firm and reliable connection.

[0031] Furthermore, the step S03 specifically includes:

[0032] Step 301: Prepare installation drawings of the lifting platform according to design requirements;

[0033] Step 302: Use the high-altitude bulk method to hoist the components of the lifting platform to the designated positions in sequence;

[0034] Step 303: assemble and weld the components of the lifting platform according to the installation drawings;

[0035] Step 304, welding the assembled lifting platform and the connecting rod;

[0036] Step 305, welding the lifting platform and the main truss pre-assembled unit to form a stable overall system;

[0037] Step 306: Inspect and test the welding parts to ensure the stability and safety of the lifting platform.

[0038] Furthermore, the step S04 specifically includes:

[0039] Step 401, determining the projection surface of the installation position of the steel structure lifting unit at the construction site;

[0040] Step 402, measuring and laying out the ground directly below the projection surface to clearly mark the tire frame installation position;

[0041] Step 403, determining the specific installation point of the tire frame according to the installation projection position of each column of the corridor;

[0042] Step 404: Perform foundation treatment at the determined installation point to ensure that the ground is flat and has sufficient load-bearing capacity;

[0043] Step 405: transport the tire frame components to the installation location according to the design requirements;

[0044] Step 406: Assemble and fix the components of the tire frame according to the installation sequence to ensure the stability and load-bearing capacity of the tire frame.

[0045] Furthermore, the step S05 specifically includes:

[0046] Step 501: transport the components of the lifting unit of the corridor to the top of the tire frame according to the construction drawings;

[0047] Step 502: Install the lifting units of the corridor step by step from bottom to top and from the middle to both sides according to the design sequence;

[0048] Step 503: During the assembly process, pay attention to maintaining the balance of the lifting unit to avoid the risk of overturning;

[0049] Step 504, ensuring that the load-bearing of each tire frame is evenly distributed to prevent potential safety hazards;

[0050] Step 505: Arrange measurement points at key positions of the lifting unit, and install fiber grating sensors, acceleration capacitance sensors, and three-dimensional anemometers;

[0051] Step 506: Perform quality inspection and stability test on the installed parts to ensure that the assembly quality meets the engineering requirements.

[0052] Furthermore, the step S06 specifically includes:

[0053] Step 601: Determine the installation position of the lower suspension point sling according to the design drawing;

[0054] Step 602: Install the lower hanging point sling according to the requirements of the three-view drawing of the lower hanging point sling;

[0055] Step 603: Install the lifting device on the lifting platform to ensure that its position and angle meet the design requirements;

[0056] Step 604, connect the steel strand to the lifting platform to ensure that the connection is firm and reliable;

[0057] Step 605, connecting the other end of the steel strand to the lower suspension point sling, and adjusting the tension of the steel strand;

[0058] Step 606: Perform a comprehensive check on all connection points to ensure that the connection is safe and reliable;

[0059] Step 607: Conduct a comprehensive inspection of the hydraulic lifter, equipment system, and structural system to ensure that the equipment operates normally.

[0060] Furthermore, the step S07 specifically includes:

[0061] Step 701, start the hydraulic lifting system and start the lifting process;

[0062] Step 702: Using the displacement sensors installed on the hydraulic lifters, real-time monitoring of the lifting displacement synchronization of each hydraulic lifter;

[0063] Step 703: After each step of graded loading is completed, suspend the lifting and analyze the key node sensor data;

[0064] Step 704, ensure that the synchronous lifting displacement distances of the four strands are the same, and the stress, strain and displacement of the key nodes of the lifting unit and the truss pre-installed unit are normal;

[0065] Step 705: When the lifting unit is about to leave the tire frame, reduce the lifting speed and closely observe the ground clearance of each point;

[0066] Step 706: If necessary, perform "single-point lifting" to ensure that the lifting unit is stable off the ground;

[0067] Step 707: When the lifting unit reaches the designed elevation of about 200 mm, the lifting is stopped and each lifting point is fine-tuned to ensure that the structure reaches the designed position accurately.

[0068] Furthermore, the step S08 specifically includes:

[0069] Step 801: After the hydraulic lifting system equipment is locked and left to stand still and stabilize, prepare for the installation of the subsequent supplementary section;

[0070] Step 802: Use a crane to lift the subsequent supplementary section to the designed position;

[0071] Step 803, accurately docking the rear supplementary section with the lifting unit;

[0072] Step 804, welding the post-supplement segment to the lifting unit and the pre-installation unit to ensure a firm connection;

[0073] Step 805: After welding is completed, the hydraulic lifting system equipment is kept locked and the steel strand is kept in a tensioned state;

[0074] Step 806: Read the sensor data of each measuring point and analyze the stress, strain and displacement deformation of the key nodes;

[0075] Step 807: Based on the analysis results, evaluate the safety and stability of the corridor to ensure that the structure is in a safe state.

[0076] Furthermore, the step S09 specifically includes:

[0077] Step 901: Determine the installation order and position of the rear-mounted unit according to the design drawing;

[0078] Step 902: lift the rear-mounted units one by one to the installation position from top to bottom using a crane;

[0079] Step 903, accurately dock each rear-mounted unit with the installed structure;

[0080] Step 904: After the docking is completed, welding is performed to ensure that the connection is firm and reliable;

[0081] Step 905: During the installation process, continue to pay attention to the value changes of each sensor;

[0082] Step 906: Analyze sensor data to evaluate the stability of the corridor structure;

[0083] Step 907: If any abnormality is found, the installation operation is stopped immediately and necessary adjustment measures are taken;

[0084] Step 908: After completing the installation of all rear-mounted units, conduct a comprehensive inspection and test of the overall structure;

[0085] The step S10 specifically includes:

[0086] Step 1001, ensure that each unit of the corridor is installed and connected to the embedded steel columns of the main structure;

[0087] Step 1002, complete the heat treatment of all welding parts to ensure that the welding quality meets the requirements;

[0088] Step 1003: Conduct a comprehensive inspection of the overall structure to confirm that there are no potential safety hazards;

[0089] Step 1004, start the hydraulic lifting system equipment and start the synchronous decompression process;

[0090] Step 1005, slowly releasing the pressure of the hydraulic system until the steel strand is completely relaxed;

[0091] Step 1006: After confirming that the structure has fully loaded, remove the hydraulic lifting system equipment;

[0092] Step 1007, dismantle all temporary measures and auxiliary equipment related to the lifting;

[0093] Step 1008: Conduct a final comprehensive inspection and test on the entire corridor structure to ensure that it meets the design requirements and usage standards.

[0094] Among them, in step S02, the welding strength of the main truss preassembly unit is limited by the main truss preassembly unit welding strength equation, which is used to evaluate the strength of the main truss preassembly unit welding, taking into account factors such as welding length, thickness and material properties.

[0095] The welding strength equation of the main truss pre-assembled unit is specifically expressed as follows:

[0096]

[0097] Where S is the welding strength index; k is the welding process coefficient; L is the total length of the weld (mm); t is the weld thickness (mm); E is the elastic modulus of the welding material (MPa); Y is the yield strength of the welding material (MPa); i is the imaginary unit; θ is the weld angle (radians).

[0098] Parameter acquisition method:

[0099] k: Determined by experiment. The specific steps include:

[0100] 1) Make standard test pieces and perform welding;

[0101] 2) Perform a tensile test and record the breaking load;

[0102] 3) Calculate the ratio of actual strength to theoretical strength to obtain the k value.

[0103] L and t: obtained through design drawings and on-site measurements.

[0104] E and Y: Obtained from the material data sheet provided by the material supplier.

[0105] θ: Measured on-site using an angle measuring instrument.

[0106] The stability of the stabilizing system in step S03 is evaluated using a lifting platform stability evaluation equation, which is used to evaluate the stability of the lifting platform, taking into account the geometric characteristics and load distribution of the platform.

[0107] The lifting platform stability evaluation equation is specifically expressed as follows:

[0108]

[0109] Where SI is the stability index; n is the number of evaluation points; M r is the anti-overturning moment (N·m); M o is the overturning moment (N·m); λ is the stability attenuation coefficient; h is the platform height (m); x is the horizontal position of the platform (m).

[0110] Parameter acquisition method:

[0111] M r and M o : Calculate by the following steps:

[0112] 1) Determine the center of gravity of the platform:

[0113] Among them, m j is the mass of the jth component, x j and j is the coordinate of the jth component.

[0114] 2) Calculate M r :

[0115] Where g is the acceleration due to gravity, x is e The edge of the platform.

[0116] 3) Calculate M o :M o =F w ·h c ;

[0117] Among them, F w is the wind load, h c For the effect height.

[0118] λ: obtained by fitting experimental data. The specific steps include:

[0119] 1) Measure the stability of the platform at different heights and horizontal positions;

[0120] 2) Use the least squares method to fit the data and obtain the λ value.

[0121] It is calculated by measuring the height change of the platform at different positions.

[0122] The parameters of synchronous lifting and unloading position control in step S07 are defined by a synchronous lifting control equation, which is used to control the multi-point synchronous lifting process to ensure the stability and synchronization of the lifting.

[0123] The synchronous lifting control equation is specifically expressed as follows:

[0124]

[0125] In the formula, v i (t) is the lifting speed of the i-th lifting point at time t (m / s); v0 is the reference lifting speed (m / s); α is the speed adjustment coefficient; T is the adjustment period (s); β is the acceleration response coefficient; Δh i is the displacement deviation of the i-th lifting point (m); γ is the synchronization correction coefficient; N is the total number of lifting points; h j and h i are the heights (m) of the j-th and i-th lifting points respectively.

[0126] Parameter acquisition method:

[0127] v0: Determined according to engineering requirements and equipment capabilities.

[0128] α and T: Determined through simulation experiments, the steps include:

[0129] 1) Set different α and T values ​​for lifting simulation;

[0130] 2) Analyze the stability and efficiency of the lifting process;

[0131] 3) Select the optimal combination of α and T.

[0132] β: Determined by experiment, the steps include:

[0133] 1) Measure the system response under different accelerations;

[0134] 2) Calculate the ratio of acceleration to response and take the average value as β.

[0135] γ: Calculated in real time by the control system adaptive algorithm, the initial value can be determined by experiments.

[0136] Δh i 、h j and h i : Obtained through real-time measurement by the displacement sensor installed on the hydraulic lifter.

[0137] The stress distribution of the corridor structure during the installation process in step S08 is evaluated using the corridor structure stress distribution equation, which is specifically expressed as follows:

[0138]

[0139] Where, σ(x, y, z) is the stress value (MPa) at the spatial point (x, y, z); σ0 is the reference stress (MPa); K is the considered stress wave number; Ak is the amplitude of the kth stress wave (MPa); μ k is the attenuation coefficient; r k (x, y, z) is the distance from point (x, y, z) to the kth stress source (m); ω k is the spatial frequency; φ k is the phase angle (radians).

[0140] Parameter acquisition method:

[0141] σ0: Preliminary estimate through finite element analysis, and then corrected by measured data.

[0142] A k , μ k ,ω k and φ k :Get it by following the steps below:

[0143] 1) Arrange stress sensors at key points of the structure;

[0144] 2) Collect stress data during installation;

[0145] 3) Use fast Fourier transform (FFT) to analyze the data and obtain the main stress wave components;

[0146] 4) Use nonlinear least squares method to fit the data and obtain the values ​​of each parameter.

[0147] r k (x,y,z): Calculated by the following formula:

[0148]

[0149] Among them, (x k ,y k ,z k ) are the coordinates of the kth stress source, which are determined by structural analysis.

[0150] Among them, in step S09, the installation sequence can also be optimized using the after-installation unit installation optimization equation, which is used to optimize the installation sequence and method of the after-installation unit to minimize structural deformation and stress concentration.

[0151] The after-installation unit installation optimization equation is specifically expressed as follows:

[0152]

[0153] stg j (σ,u)≤0,j=1,2,...,P

[0154] Where J is the optimization objective function; i} is the installation sequence set; M is the number of post-installation units; w1, w2 and w3 are weight coefficients; σ i is the stress field after the installation of the i-th unit (MPa); u is the displacement field (m); V is the structural volume (m 3 );t i is the installation time of the ith unit (s); g j are constraints; P is the number of constraints.

[0155] Parameter acquisition method:

[0156] w1, w2 and w3: determined through expert evaluation and historical data analysis, and weights can be assigned using the analytic hierarchy process (AHP).

[0157] σ i :Obtained through finite element analysis and real-time stress monitoring, specific steps:

[0158] 1) Establish structural finite element model;

[0159] 2) Simulate the installation process of each unit and calculate the stress distribution;

[0160] 3) Use stress sensors to monitor in real time and correct model results.

[0161] u: obtained by displacement sensor and laser scanning measurement, the steps include:

[0162] 1) Install displacement sensors at key points;

[0163] 2) Scan the overall structure using a 3D laser scanner;

[0164] 3) Calculate the displacement field through the point cloud registration algorithm.

[0165] t i : Record the start and end time of the actual installation of each unit.

[0166] g j (σ,u): defined according to engineering specifications and structural safety requirements, for example:

[0167] g1=max(σ)-σ allow ≤0, where σ allow is the allowable stress;

[0168] g2=max(|u|)-u allow ≤0, where u allow To allow displacement.

[0169] These equations take into account structural mechanics, dynamics and optimization theory, contain multiple measurable and calculable parameters, and involve partial derivatives, complex numbers and nonlinear relationships. Each equation targets a specific construction step and aims to improve construction quality and efficiency.

[0170] Compared with the prior art, the method for safely splicing and lifting an asymmetric large-span steel corridor provided by the present invention has the following beneficial effects:

[0171] 1. Improved safety: By dividing the corridor into the main truss pre-installed unit, lifting unit and post-installed unit, this method greatly reduces the risk of high-altitude operations. In particular, the lifting unit is lifted as a whole after being assembled on the ground, which significantly reduces the workload of high-altitude welding and assembly, thereby improving the safety of construction workers.

[0172] 2. Improved construction efficiency: Combining the advantages of the high-altitude bulk method and the overall hoisting method, this method achieves a more efficient construction process. The main truss pre-installation unit and the post-installation unit adopt the high-altitude bulk method, while the lifting unit adopts the overall hoisting method. This combination method fully utilizes the advantages of the two methods and speeds up the construction speed.

[0173] 3. Improved precision: By adopting the control strategy of "balancing the oil pressure at the lifting point, adjusting the structural posture, synchronous displacement control, and sequential unloading and positioning", this method achieves precise control of the lifting process. The displacement sensor is used to monitor the lifting displacement synchronization of each hydraulic lifter in real time, ensuring the smoothness and precision of the lifting process.

[0174] 4. Enhanced adaptability: This method is particularly suitable for the installation of asymmetric large-span steel corridors, and can effectively handle complex structural characteristics and construction environments. In particular, when the embedded components of the main structure cause overall lifting to be blocked, this technical problem was successfully solved through the segmented installation strategy.

[0175] 5. Comprehensive monitoring system: Fiber Bragg grating sensors, acceleration capacitance sensors and three-dimensional anemometers are arranged at key locations of the corridor to build a comprehensive monitoring system. This not only improves the safety of the construction process, but also provides data support for real-time adjustment and optimization.

[0176] 6. Reduce structural damage: By assembling the lifting unit as a whole on the ground, this method avoids frequent structural adjustments and repeated stresses during high-altitude operations, reduces potential damage to the structure, and improves the final installation quality.

[0177] 7. Shortened construction period: Since most of the complex assembly work is completed on the ground, the time for high-altitude operations is greatly shortened, which not only improves efficiency, but also reduces the impact of external factors such as weather on the construction progress, which is conducive to shortening the overall construction period.

[0178] In summary, the present invention solves the technical problem that it is difficult to ensure installation accuracy under a safe condition in the existing asymmetric large-span steel corridor installation and splicing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0179] Figure 1 This is a schematic diagram of the corridor structure; Figure 2 It is a schematic diagram of each installation unit and component of the corridor; Figure 3 It is a schematic diagram of the elevation arrangement of truss 6-1; Figure 4 It is a schematic diagram of the elevation arrangement of truss 6-2; Figure 5 It is a 10.900m floor plan; Figure 6 It is a 15.400m floor plan; Figure 7 It is a 19.600m floor plan; Figure 8 It is a 23.850m floor plan; Fig. 9 is a schematic diagram of lifting platform one; Fig.10 is a schematic diagram of lifting platform two; Fig.11 It is a schematic diagram of lifting platform three; Fig.12 It is a schematic diagram of lifting platform four; Fig.13 It is a schematic diagram of a hydraulic lifter; Fig.14 is a schematic diagram of the guide frame; Fig.15 It is a schematic diagram of the upper hoist; Fig.16 It is a schematic diagram of the lower sling; Fig.17 It is the elevation drawing of the corridor; Fig.18 A flow chart of the method provided by the present invention;

[0180] The definitions of the figure numerals in the accompanying drawings are as follows: 1. Main structure; 2. Corridor; 3. Concrete platform; 4. Main truss pre-installed unit; 5. Corridor supplement section; 6. Post-installed unit; 7. Lifting unit; 8. Fiber Bragg grating sensor; 9. Acceleration capacitor sensor; 10. Connecting rod; 11. Main structure pre-buried steel column; 12. Steel strand; 13. Upper hoist; 14. Lower hoisting point hoist; 15. Cradle; 17. Lifting platform. DETAILED DESCRIPTION

[0181] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0182] like Fig.18 As shown, it is a flow chart of a method for safely splicing and lifting an asymmetric large-span steel corridor provided by the present invention, and the method comprises the following steps:

[0183] S01. Divide the corridor into a main truss pre-installation unit, a lifting unit and a post-installation unit;

[0184] S02. Install the main truss pre-installed unit of the corridor: hoist and weld the components of the main truss pre-installed unit from both ends to the middle in batches by crane, place them on the brackets, and weld them to the pre-buried steel frame columns of the main structure;

[0185] S03. Install the lifting platform: Use the high-altitude bulk method to install the lifting platform, weld the lifting platform with the connecting rod and the main truss pre-installed unit to form a stable system;

[0186] S04. Install the tire frame: determine the tire frame installation position on the ground directly below the projection surface of the steel structure lifting unit installation position;

[0187] S05. Assemble the lifting unit of the corridor above the tire frame: install the lifting unit of the corridor step by step from bottom to top and from the middle to both sides;

[0188] S06, Lifting preparation: Install the lower lifting point sling, upper lifting sling and steel strand;

[0189] S07, Formal lifting: adopt the synchronous lifting and unloading position control strategy of oil pressure balance of lifting points, structural posture adjustment, synchronous displacement control, and sequential unloading and positioning;

[0190] S08. Installation of the lifting unit of the corridor: Use a crane to lift the supplementary section to the designed position and weld it with the lifting unit and pre-installed unit;

[0191] S09. Installation of rear-mounted units: lift and install the rear-mounted units in order from top to bottom;

[0192] S10. Unloading: The hydraulic lifting system equipment is depressurized synchronously until the steel strands are completely relaxed; the hydraulic lifting system equipment and related temporary measures are dismantled.

[0193] The specific implementation methods of the above steps are described in detail below:

[0194] 1. Corridor segmentation and preparation work

[0195] Before starting construction, detailed segmentation planning and preparation work are required. This step corresponds to steps 101 to 104 in claim 2.

[0196] First, the segmented locations of the corridor are determined according to the structural characteristics and construction requirements of the corridor. Figure 1-4 As shown, considering the asymmetric large span characteristics of the corridor, it is necessary to carefully analyze the structural stress conditions and construction convenience. The corridor is divided into a main truss pre-installed unit 4, a lifting unit 7 and a rear-installed unit 6. Among them, the main truss pre-installed unit 4 is located in the middle part of the corridor, the lifting unit 7 is located on both sides of the main truss pre-installed unit 4, and the rear-installed unit 6 is located on the outside of the lifting unit 7.

[0197] According to the determined segment locations, make detailed construction drawings, such as Figure 5-8 These drawings need to include the specific dimensions, connection methods and installation sequence of each unit. In particular, due to the asymmetry of the corridor, the center of gravity and expected stress points of each unit need to be clearly marked in the drawings to facilitate balance adjustments during the subsequent installation process.

[0198] In order to ensure the orderly construction process, each unit is numbered and a corresponding installation plan is formulated. This plan needs to take into account the connection sequence between the units and the connection method with the main structure. At the same time, a detailed quality control plan needs to be formulated, including welding quality inspection standards, structural stability assessment methods, etc.

[0199] 2. Installation of the main truss pre-assembled unit

[0200] The installation of the main truss pre-assembly unit 4 is a key link in the construction of the entire corridor, corresponding to steps 201 to 205 in claim 3.

[0201] First, according to the construction drawings, the components of the main truss pre-assembly unit 4 are transported to the construction site. During transportation, appropriate protective measures need to be taken to prevent the components from being deformed or damaged. After arriving at the site, the components are classified and stored according to the numbers for subsequent installation.

[0202] Use a crane to hoist the components of the main truss pre-assembly unit 4 from both ends to the middle in batches. During the hoisting process, special attention should be paid to the balance of the components to avoid tilting or swinging. The hoisting sequence should follow the principle of "from bottom to top, from primary to secondary" to ensure the stability of the structure.

[0203] According to the design requirements, the hoisted parts are welded. During the welding process, the welding quality needs to be strictly controlled to ensure that the welding strength meets the engineering standards. Here, the main truss pre-assembled unit welding strength equation can be used for evaluation:

[0204]

[0205] Among them, the welding process coefficient k is determined by making a standard specimen and performing a tensile test. The total length L and thickness t of the weld are obtained through design drawings and on-site measurements. The elastic modulus E and yield strength Y of the welding material are obtained from the data sheet provided by the material supplier. The weld angle θ is measured on-site using an angle measuring instrument.

[0206] Through this equation, the strength index S of each weld point can be evaluated. In actual construction, it should be ensured that the strength index S of all weld points exceeds the predetermined safety threshold. If the strength index of some weld points is found to be low, reinforcement measures need to be taken, such as increasing the weld thickness or changing the welding angle.

[0207] Place the welded main truss pre-assembled unit 4 on the pre-installed bracket 2. During the placement process, high-precision measuring equipment is required to ensure that the horizontality and verticality of the unit 4 meet the design requirements. If deviations are found, adjustments need to be made in a timely manner.

[0208] Finally, the main truss pre-assembled unit 4 is welded to the embedded steel frame column 11 of the fifth floor of the main structure. This step requires special attention to the welding quality because it is the key point connecting the corridor and the main structure. After the welding is completed, a comprehensive non-destructive test, such as ultrasonic testing or X-ray testing, should be carried out to ensure the integrity and reliability of the welded connection.

[0209] 3. Installation of lifting platform

[0210] like Figure 9-12 The installation of the lifting platform 17 shown corresponds to steps 301 to 306, which is a key step to ensure that the subsequent lifting work proceeds smoothly.

[0211] First, according to the design requirements, the installation drawings of the lifting platform 17 are prepared. These drawings need to mark the position, size and connection method of each component in detail. Considering the asymmetry of the corridor, the design of the lifting platform 17 needs to pay special attention to moment balance.

[0212] The high-altitude bulk method is used to hoist the various components of the lifting platform 17 to the designated positions in sequence. During the hoisting process, multiple cranes need to be used to work together to ensure that the components are in place stably. After each component is in place, it needs to be temporarily fixed immediately to prevent displacement or tilting.

[0213] According to the installation drawings, the components of the lifting platform 17 are assembled and welded. During the welding process, the segmented welding method should be adopted to reduce the influence of thermal stress. Each completed welding section needs to be cooled and inspected to ensure the welding quality.

[0214] The assembled lifting platform 17 is welded to the connecting rod 10. In this step, special attention should be paid to the stress of the connecting rod 10 to ensure that it can withstand the load in the subsequent lifting process.

[0215] The lifting platform 17 is welded to the main truss pre-assembled unit 4 to form a stable overall system. This step is the key to the stability of the entire lifting system. After welding is completed, the lifting platform stability evaluation equation needs to be used for evaluation:

[0216]

[0217] Among them, the anti-overturning moment Mr and overturning moment Mo are obtained by calculating the center of gravity position of the platform and considering factors such as wind load. The stability attenuation coefficient λ is obtained by fitting the experimental data. The change rate of the platform height h and the horizontal position x is obtained by measurement.

[0218] Through this equation, the stability index SI of the lifting platform can be obtained. In actual construction, it should be ensured that the SI value is always kept within the safe range. If the SI value is found to be low, measures need to be taken to improve stability, such as adding counterweights or adjusting the position of the connection points.

[0219] Finally, the welds are fully inspected and tested to ensure the stability and safety of the lifting platform 17. This includes non-destructive testing of all welds, as well as static and dynamic load tests on the entire platform.

[0220] 4. Installation of tire frame

[0221] The installation of the tire frame 15 corresponds to steps 401 to 406 in claim 5 and is the basis for ensuring the safe assembly of the lifting unit 7.

[0222] First, determine the projection surface of the installation position of the steel structure lifting unit 7 at the construction site. This requires the use of high-precision measurement equipment, such as a total station or a 3D laser scanner, to ensure the accuracy of the projection.

[0223] The ground directly below the projection surface is measured and laid out to clearly mark the installation position of the tire frame 15. During the laying out process, the flatness and bearing capacity of the ground need to be considered, and the ground treatment is performed when necessary.

[0224] According to the installation projection position of each column of the corridor, determine the specific installation point of the tire frame 15. This step requires special attention to the force distribution of the tire frame 15 to ensure that each installation point can evenly bear the load.

[0225] The ground is treated at the determined installation point to ensure that the ground is flat and has sufficient load-bearing capacity. This may include compacting the foundation, pouring a concrete cushion, etc. After the foundation treatment is completed, a bearing capacity test is required to ensure that it can meet the load requirements of the tire frame 15.

[0226] According to the design requirements, the tire frame 15 components are transported to the installation location. During transportation, care should be taken to protect the components to prevent deformation or damage. After arriving at the site, the components are classified and stored according to the numbers.

[0227] According to the installation sequence, the components of the tire frame 15 are assembled and fixed. During the assembly process, tools such as a level and a theodolite are required to ensure that the horizontality and verticality of the tire frame 15 meet the requirements. After each part is installed, a stability check is required to ensure the overall stability and load-bearing capacity of the tire frame 15.

[0228] 5. Assembly of lifting unit

[0229] The assembly of the lifting unit 7 corresponds to steps 501 to 506 in claim 6, and is one of the most complex and critical links in the entire construction process.

[0230] First, according to the construction drawings, the components of the lifting unit 7 of the corridor are transported to the top of the tire frame 15. Special protection measures need to be taken during transportation, especially for some precise or vulnerable components.

[0231] The lifting units 7 of the corridor are installed step by step according to the designed sequence, from bottom to top and from the middle to the sides. This installation sequence ensures the stability of the structure and reduces the risk of overturning. During the assembly process, the alignment of the components and the quality of the connection need to be constantly checked.

[0232] During the assembly process, special attention should be paid to maintaining the balance of the lifting unit 7. Temporary support or counterweight devices can be used to adjust the center of gravity to avoid the risk of overturning. At the same time, the force of the tire frame 15 needs to be monitored in real time to ensure that the load distribution of each tire frame is even.

[0233] Measuring points are arranged at key positions of the lifting unit 7, and fiber grating sensors 8, acceleration capacitance sensors 9 and three-dimensional anemometers 1 are installed. These sensors will provide important real-time data during the subsequent lifting and installation process to evaluate the safety and stability of the structure.

[0234] Carry out quality inspection and stability test on the installed parts. This includes non-destructive testing of welding quality, static load test of the whole structure, etc. The results of all inspections and tests need to be recorded in detail and compared with the design requirements.

[0235] If any problems or deviations are found during the assembly process, the work needs to be stopped immediately to analyze the causes and develop solutions. If necessary, it may be necessary to readjust the installation sequence or modify the design of certain parts.

[0236] 6. Improve preparation

[0237] The lifting preparation work corresponds to steps 601 to 607 in claim 7 and is a key step in ensuring the safety of the lifting process.

[0238] First, according to the design drawings, determine the installation position of the lower suspension point sling 14. These positions need to consider the uniformity of the structural force and the connection with the main structure.

[0239] According to the requirements of the three-view drawing of the lower hanging point sling 14, the lower hanging point sling 14 is installed. High-precision measuring equipment is required during the installation process to ensure that the position and angle of each sling strictly meet the design requirements.

[0240] The upper sling 13 is installed on the lifting platform 17 to ensure that its position and angle meet the design requirements. The installation of the upper sling 13 requires special attention to the connection strength between it and the lifting platform 17, because they will bear the weight of the entire lifting unit 7.

[0241] Connect the steel strand 12 to the lifting platform 17 to ensure that the connection is firm and reliable. Use a professional connector and perform a tensile test to ensure that it can withstand the expected maximum load.

[0242] The other end of the steel strand 12 is connected to the lower suspension point sling 14, and the tension of the steel strand 12 is adjusted. The tension adjustment requires the use of a professional tension meter to ensure that the tension of each steel strand 12 is uniform and avoid local stress concentration.

[0243] Perform a comprehensive inspection of all connection points to ensure that the connection is safe and reliable. This includes torque checks on all bolted connections, non-destructive testing of welded connections, etc.

[0244] Finally, a comprehensive inspection of the hydraulic lifter, equipment system, and structural system is conducted to ensure that the equipment is operating normally. This includes pressure testing of the hydraulic system, insulation testing of the electrical system, and functional testing of the control system. All inspection results need to be recorded in detail and signed and confirmed by professionals.

[0245] 7. Formal promotion process

[0246] The formal lifting process corresponds to steps 701 to 707 in claim 8 and is the most critical and dangerous part of the entire construction.

[0247] First, start the hydraulic lifting system and start the lifting process. The lifting speed needs to be strictly controlled, especially in the initial stage, and a slow lifting method should be used to observe the reaction of the entire system.

[0248] The displacement sensors installed on the hydraulic lifters are used to monitor the lifting displacement synchronization of each hydraulic lifter in real time. The synchronous lifting control equation can be applied here for precise control:

[0249]

[0250] The reference lifting speed v0 is determined according to the engineering requirements and equipment capacity. The speed adjustment coefficient α and the adjustment period T are determined by simulation experiments. The acceleration response coefficient β is determined by experiments, and the synchronization correction coefficient γ is calculated in real time by the control system adaptive algorithm. The displacement deviation Δhi and the heights hj and hi of each lifting point are obtained by real-time measurement of the displacement sensor.

[0251] Through this equation, the speed of each lifting point can be accurately controlled to ensure the stability and synchronization of the lifting process. If the speed of a certain lifting point is found to be abnormal, the system will automatically adjust it to maintain overall synchronization.

[0252] After each step of graded loading is completed, the lifting is suspended and the key node sensor data is analyzed. This includes analyzing the data of the fiber grating sensor 8, the acceleration capacitance sensor 9 and the three-dimensional anemometer 1. It is necessary to ensure that the four strands of steel strands 12 are lifted synchronously with the same displacement distance, and the stress, strain and displacement of the key nodes of the lifting unit 7 and the truss pre-installed unit 4 are normal.

[0253] It is particularly important to monitor the stability of the main structure and the lifting platform 17 in real time. The lifting platform stability evaluation equation mentioned above can be used for real-time evaluation:

[0254]

[0255] If the stability index SI drops abnormally, it is necessary to stop lifting immediately, analyze the cause and take corresponding measures.

[0256] When the lifting unit 7 is about to leave the tire frame 15, it is necessary to reduce the lifting speed and closely observe the ground clearance of each point. This is a critical transition stage, and special attention should be paid to the balance and stability of the structure. If necessary, "single-point lifting" can be performed to ensure that the lifting unit 7 is stable off the ground.

[0257] When the lifting unit 7 reaches the designed elevation of about 200 mm, the lifting is stopped and each lifting point is fine-tuned to make the structure reach the designed position accurately. This fine-tuning process requires the use of high-precision measurement equipment, such as a total station or a 3D laser scanner, to ensure the accuracy of the final position.

[0258] During the entire lifting process, the safety management system needs to be strictly implemented, including setting up safety warning areas, deploying professional safety supervisors, and formulating emergency plans. At the same time, it is necessary to maintain real-time communication with the ground command center to ensure timely transmission of information and rapid response to decisions.

[0259] 8. Installation of corridor lifting unit

[0260] The installation of the corridor lifting unit 7 corresponds to steps 801 to 807 in claim 8, and is a key step in connecting the lifting unit to the main structure.

[0261] First, after the hydraulic lifting system equipment is locked and left to stand still, prepare for the installation of the supplementary section 5. The preparation work for the supplementary section 5 includes size verification, surface treatment and installation of temporary fixing devices.

[0262] The subsequent segment 5 is lifted to the designed position by a crane. This process requires precise control to ensure the precise docking of the subsequent segment 5 and the lifting unit 7. A laser positioning system can be used to assist in positioning and improve docking accuracy.

[0263] Weld the post-complementary section 5 with the lifting unit 7 and the pre-installed unit 4 to ensure a firm connection. During the welding process, welding parameters such as current, voltage, welding speed, etc. need to be strictly controlled to ensure welding quality. After welding is completed, non-destructive testing such as ultrasonic testing or X-ray testing is required to ensure the integrity and reliability of the weld.

[0264] After welding is completed, the hydraulic lifting system equipment is kept locked and the steel strand 12 is kept in a tensioned state. This is to ensure that the entire structure remains stable during the connection process.

[0265] Read the sensor data at each measuring point and analyze the stress, strain and displacement deformation of key nodes. Here, the corridor structure stress distribution equation can be used for evaluation:

[0266]

[0267] Among them, the reference stress σ0 is preliminarily estimated by finite element analysis and then corrected by measured data. The stress wave amplitude Ak, attenuation coefficient μk, spatial frequency ωk and phase angle φk are obtained by fast Fourier transform (FFT) analysis of measured data. The distance rk(x, y, z) from the point (x, y, z) to the kth stress source is determined by structural analysis.

[0268] This equation can be used to evaluate the stress distribution of the corridor structure during installation. If the stress values ​​in certain areas are found to be abnormal, the cause needs to be analyzed immediately and corresponding measures need to be taken, such as adjusting the connection method or adding temporary supports.

[0269] Based on the analysis results, the safety and stability of the corridor are evaluated to ensure that the structure is in a safe state. This evaluation process needs to consider multiple factors, including stress distribution, deformation, overall structural stability, etc. If any abnormality is found, the operation needs to be stopped immediately, the cause needs to be analyzed, and a solution needs to be developed.

[0270] 9. Installation of rear-mounted units

[0271] The installation of the rear-mounted unit 6 corresponds to steps 901 to 908 in claim 9 and is the final stage of the corridor installation.

[0272] First, according to the design drawings, determine the installation order and position of the rear-mounted unit 6. This order needs to take into account the uniformity of the structural force and the convenience of construction. The installation optimization equation for the rear-mounted unit can be used to optimize the installation order:

[0273]

[0274] stg j (σ,u)≤0,j=1,2,...,P

[0275] The weight coefficients w1, w2 and w3 are determined through expert evaluation and historical data analysis. Stress field σ i Obtained through finite element analysis and real-time stress monitoring. The displacement field u is obtained through displacement sensors and laser scanning measurement. Installation time t i Record the actual start and end time of each unit installation. Constraint g j Defined according to engineering specifications and structural safety requirements.

[0276] Through this optimization equation, an optimal installation sequence can be obtained, which can minimize structural deformation and stress concentration while improving installation efficiency.

[0277] The rear mounted units 6 are lifted one by one to the installation position using a crane in a top-down order. During the lifting process, attention should be paid to the stability of the control unit to avoid collision with the installed structure.

[0278] Each rear-mounted unit 6 is precisely docked with the installed structure. This process requires the use of high-precision measurement equipment, such as a total station or a 3D laser scanner, to ensure the accuracy of the docking. The safely completed elevation is shown in the figure below. Fig.17 shown.

[0279] After the butt joint is completed, welding is performed to ensure that the connection is firm and reliable. During the welding process, welding parameters need to be strictly controlled and real-time monitoring is performed to ensure welding quality. After welding is completed, non-destructive testing, such as ultrasonic testing or X-ray testing, is required to ensure the integrity and reliability of the weld.

[0280] During the installation process, the value changes of each sensor are continuously monitored, including real-time analysis of the data of the fiber grating sensor 8, the acceleration capacitance sensor 9 and the three-dimensional anemometer 1.

[0281] Analyze sensor data and evaluate the stability of the corridor structure. If any abnormality is found, such as a sudden increase in stress or abnormal displacement, the installation work needs to be stopped immediately and necessary adjustment measures need to be taken. This may include adjusting the installation sequence, adding temporary supports, or modifying the connection method.

[0282] After the installation of all rear-mounted units 6 is completed, the overall structure is fully inspected and tested. This includes static and dynamic load tests on the entire corridor structure to check whether its load-bearing capacity and dynamic characteristics meet the design requirements.

[0283] 10. Uninstallation process

[0284] The unloading process corresponds to steps 1001 to 1008 in claim 10 and is the final stage of the entire construction.

[0285] First, ensure that each unit of the corridor is installed and connected to the embedded steel columns 11 of the main structure. This requires a comprehensive inspection, including inspection of all connection points, non-destructive testing of welds, etc.

[0286] Complete heat treatment of all welded parts to ensure that the welding quality meets the requirements. The heat treatment process requires strict control of temperature and time to ensure that the performance of the welded parts meets the design requirements.

[0287] Conduct a comprehensive inspection of the overall structure to confirm that there are no safety hazards. This includes a comprehensive inspection of the structure's geometric dimensions, surface quality, connection quality, etc.

[0288] Start the hydraulic lifting system equipment and start the synchronous decompression process. This process needs to be very careful to ensure that the structure remains balanced and stable during the unloading process. You can continue to use the synchronous lifting control equation, but you need to change the lifting speed to a negative value to achieve synchronous descent:

[0289]

[0290] The hydraulic system pressure is slowly released until the steel strand 12 is completely relaxed. During this process, the stress and deformation of the structure need to be continuously monitored to ensure that no sudden stress release or deformation occurs.

[0291] After confirming that the structure is fully loaded, remove the hydraulic lifting system equipment. The removal process needs to be carried out in a predetermined order to ensure that no damage is caused to the structure.

[0292] Remove all temporary measures and auxiliary equipment related to lifting. This includes removing temporary supports, slings, sensors, etc. Pay attention to safety during the removal process and avoid falling objects from height.

[0293] Finally, the entire corridor structure is subjected to a final comprehensive inspection and test to ensure that it meets the design requirements and usage standards. This includes a comprehensive assessment of the structure's bearing capacity, performance, durability, etc. Static and dynamic load tests can be performed to check the performance of the structure under various load conditions. At the same time, it is also necessary to check whether the structure's fire resistance, anti-corrosion and other properties meet the requirements.

[0294] Specifically, the principle of the present invention is:

[0295] 1. Principle of segmented installation: This method divides the corridor into the main truss pre-installed unit, the lifting unit and the post-installed unit. The core principle of this segmented strategy is to decompose the complex overall problem into relatively simple sub-problems. Through this decomposition, the installation of each unit can be carried out independently, greatly reducing the complexity of the overall installation. As the core part of the corridor, the main truss pre-installed unit is first installed on the pre-buried corbel, providing a stable foundation for subsequent units. The lifting unit is lifted as a whole after being assembled on the ground, avoiding the risk of high-altitude operations. The post-installed unit is installed in the final stage to complete the overall structure. This segmented method conforms to the modular design principle in engineering, which not only simplifies the construction process, but also improves the overall controllability and flexibility.

[0296] 2. Mechanical balance principle: During the lifting process, the control strategy of "balancing the oil pressure of the lifting points, adjusting the structural posture, synchronous displacement control, and sequential unloading and positioning" is adopted. This strategy is based on the principle of mechanical balance. By controlling the oil pressure of each lifting point, the entire lifting unit is ensured to maintain a balanced state during the lifting process. Synchronous displacement control ensures the coordinated movement of each point during the lifting process, avoiding structural distortion or stress concentration caused by asynchrony. This precise control not only ensures the safety of lifting, but also improves the accuracy of the final installation.

[0297] 3. Sensor feedback control principle:

[0298] This method arranges fiber Bragg grating sensors, acceleration capacitance sensors and three-dimensional anemometers at key locations of the corridor to build a comprehensive monitoring system. This design is based on feedback control theory. By real-time monitoring of the stress, strain, displacement and environmental factors (such as wind speed) of the structure, the lifting process can be adjusted in time to ensure the safety and accuracy of the construction. This real-time monitoring and feedback adjustment mechanism greatly improves the controllability and reliability of the entire process.

[0299] 4. Ground pre-assembly principle: The lifting unit is assembled on the ground. This method is based on the principle of prefabrication in engineering construction. Ground pre-assembly not only provides a safer and more stable working environment, but also allows the use of more sophisticated tools and equipment, thereby improving the quality and accuracy of assembly. In addition, ground pre-assembly also facilitates quality inspection and problem correction, reducing potential problems that are difficult to find and solve in aerial work.

[0300] 5. Dynamic adjustment principle: During the lifting process, a method of graded loading and real-time monitoring is adopted, which is based on the principle of dynamic adjustment. Through step-by-step lifting and pause analysis after each step, potential problems can be discovered and solved in a timely manner. This dynamic adjustment mechanism enhances the adaptability and safety of the entire process and can cope with various unexpected situations that may occur during the construction process.

[0301] 6. Stress analysis principle: During the entire construction process, especially during the lifting and installation stages, stress analysis is continuously performed, which is based on the stress analysis principle in structural mechanics. By real-time monitoring and analysis of the stress state of each key point of the structure, it can be ensured that the structure is always in a safe state throughout the process, avoiding structural damage or failure caused by local stress concentration or overload.

[0302] 7. Precise positioning principle: In the final installation stage, fine-tuning technology is used to accurately lift the structure to the designed position. This method is based on the principle of precise positioning. Through high-precision sensors and control systems, millimeter-level precise positioning is achieved to ensure the perfect docking of the corridor and embedded components.

[0303] In order to better understand and implement the present invention, an embodiment 1 of a specific application scenario of the present invention is provided below: Before starting the installation construction of the corridor, it is necessary to ensure that the corresponding preparations for the main structure have been completed. Pre-embedded steel structure corbels 2 are reserved on the fifth floor, and these corbels 2 will be used to support the main truss pre-installed units 4 of the corridor. At the same time, pre-embedded steel columns 11 are embedded in the welding positions of the third to sixth floors and the corridor, and these pre-embedded steel columns 11 will be used to connect with the various units of the corridor. A concrete platform 3 is embedded on the second floor, and this platform will provide support for subsequent construction. Only after the main structure is capped can the installation construction of the corridor begin.

[0304] 1. Corridor segmentation

[0305] In order to avoid collision with the main structure 1 during the lifting process and facilitate construction, the entire corridor is divided into three main units:

[0306] a) Main truss pre-installed unit 4: This is the core part of the corridor and will be installed on the pre-buried corbel 2 first.

[0307] b) Lifting unit 7: This is the part that needs to be lifted as a whole, and will be lifted into place as a whole after being assembled on the ground.

[0308] c) Rear-installed unit 6: This part will be installed gradually after the lifting unit 7 is installed.

[0309] In addition, there is a supplementary section 5 of the corridor, which will be hoisted when the lifting unit 7 is installed.

[0310] 2. Installation of main truss pre-assembly unit 4

[0311] According to the construction drawings, the components of the main truss pre-assembly unit 4 are hoisted and welded in batches from both ends to the middle by a crane. The specific steps are as follows:

[0312] a) Place the main truss pre-assembled unit 4 of the corridor on the pre-installed corbels 2.

[0313] b) Weld the main truss pre-assembled unit 4 to the embedded steel frame column 11 of the fifth floor of the main structure to ensure a firm connection.

[0314] c) Inspect the welding parts to ensure that the welding quality meets the project requirements.

[0315] 3. Installation of lifting platform 17

[0316] After the installation of the main truss pre-assembly unit 4 is completed, the next step is to install the lifting platform 17. This step is carried out using the high-altitude bulk method:

[0317] a) Hoist the various components of the lifting platform 17 to the designated locations.

[0318] b) Welding the lifting platform 17 and the connecting rod 10.

[0319] c) Welding the lifting platform 17 to the main truss pre-assembly unit 4 to form a stable overall system.

[0320] d) Install the hydraulic unit, guide frame and lifting frame. The installation diagram is as follows: Figure 13-14 shown.

[0321] 4. Installation of tire frame 15

[0322] In order to assemble the lifting unit 7 on the ground, it is necessary to install the tire frame 15. The specific steps are as follows:

[0323] a) Determine the projection surface of the installation position of the steel structure lifting unit 7 on the ground and lay out the lines.

[0324] b) Determine the installation positions of the tire frame 15, which should be directly below the installation projection positions of the columns of the corridor.

[0325] c) Install the tire frame 15 according to the design requirements to ensure its stability and load-bearing capacity.

[0326] 5. Assembly of lifting unit 7

[0327] Assembling the lifting unit 7 of the corridor on the tire frame 15 is one of the most critical steps in the entire construction process:

[0328] a) Refer to the construction drawing and install the lifting unit 7 of the corridor step by step from bottom to top and from the middle to both sides.

[0329] b) Due to the unit division of the corridor and the design characteristics of the asymmetric component layout of the corridor itself, special attention should be paid during the assembly process: the installation should be carried out from the main to the secondary and from the middle to the sides to avoid the lifting unit 7 of the corridor from overturning during the assembly process.

[0330] c) Ensure that the load-bearing of each tire frame 15 is evenly distributed to avoid potential safety hazards.

[0331] d) According to Figure 1 and Figures 3 to 8 According to the requirements, the measuring points are arranged and the fiber grating sensor 8, the acceleration capacitance sensor 9 and the three-dimensional anemometer 1 are installed. These sensors will be used to monitor various parameters during the lifting process to ensure construction safety.

[0332] 6. Preparation for promotion

[0333] After the installation of the lifting unit 7 is completed, preparations before lifting are required, such as Figure 15-16 As shown:

[0334] a) Install the lower lifting point according to the construction drawing and the three-view drawing of the lower lifting point sling 14.

[0335] b) Complete the installation of the upper sling 13 and the lower sling 14.

[0336] c) Install and connect the steel strand 12. First, connect the steel strand 12 to the lifting platform 17, and then connect it to the lower suspension point sling 14.

[0337] d) Perform a preliminary lifting test: move the lifting unit 7 slightly, then suspend the operation and maintain the hydraulic equipment system pressure.

[0338] e) Conduct a comprehensive inspection of the hydraulic lifter, equipment system, and structural system.

[0339] f) Check the status of the lifting unit 7 and remove any obstacles that may affect the lifting process.

[0340] 7. Formal promotion

[0341] In order to ensure the smooth and safe lifting process of the lifting unit 7 and the main structure, the synchronous lifting and unloading placement control strategy of "balancing the oil pressure of the lifting points, adjusting the structural posture, synchronous displacement control, and sequential unloading and positioning" is adopted:

[0342] a) Use the displacement sensors installed on the hydraulic lifters to measure the lifting displacement synchronization of each hydraulic lifter during the lifting process.

[0343] b) During the hierarchical loading process, each time a hierarchical loading step is completed, the sensor data of key nodes must be paused and analyzed. The following points need to be confirmed:

[0344] The four strands 12 are synchronously lifted and displaced over the same distance.

[0345] The stress, strain and displacement of the key nodes of the lifting unit 7 and the truss pre-installed unit 4 are normal.

[0346] The main structure and the lifting platform 17 have good stability.

[0347] c) When the lifting unit 7 is about to leave the tire frame 15 after graded loading, reduce the lifting speed and closely observe the ground clearance of each point. If necessary, perform "single-point lifting" to ensure that the lifting unit 7 is stable off the ground.

[0348] d) When the lifting unit 7 is lifted to about 200 mm from the design elevation, the lifting is suspended.

[0349] e) Make fine adjustments to each lifting point to accurately lift the structure to the designed position.

[0350] f) The hydraulic lifting system equipment stops working and keeps the lifting unit 7 in the air.

[0351] g) To adjust the posture in the air, it is necessary to make fine adjustments in height. During the fine adjustment process, the measurement point data arranged on the lifting unit 7 and the truss pre-installation unit 4 are continuously read to analyze the stability of the lifting platform 17 and the connection safety of the lifting unit 7, prevent the lifting unit 7 from tipping over, and reduce safety hazards.

[0352] 8. Installation of the lifting unit 7 of the corridor

[0353] a) After the hydraulic lifting system equipment is locked and stabilized, use a crane to lift the supplementary section 5 to the designed position.

[0354] b) Weld the post-complementary section 5, the lifting unit 7 and the pre-installed unit 4 to complete the connection between the two units.

[0355] c) After installation is completed, the hydraulic lifting system equipment remains locked and the steel strand 12 remains in a tensioned state.

[0356] d) Read the sensor data at each measuring point, analyze the stress, strain and displacement deformation of key nodes, and evaluate the safety and stability of the corridor.

[0357] 9. Installation of rear unit 6

[0358] a) Lift and install the rear-mounted unit 6 in order from top to bottom.

[0359] b) During the installation process, continue to pay attention to the values ​​of each sensor to ensure the stability of the corridor structure.

[0360] c) If any abnormal situation is found, stop the installation work immediately and take necessary adjustment measures.

[0361] 10. Uninstall

[0362] a) Ensure that all units of the corridor are installed and connected to the embedded steel columns 11 of the main structure.

[0363] b) Complete heat treatment of all welding parts to ensure that the welding quality meets the requirements.

[0364] c) The hydraulic lifting system equipment is decompressed synchronously until the steel strand 12 is completely relaxed.

[0365] d) Dismantle the hydraulic lifting system equipment and related temporary measures.

[0366] e) Carry out a final comprehensive inspection and test on the entire corridor structure to ensure that it meets the design requirements and usage standards.

[0367] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for safely splicing and lifting an asymmetric large-span steel corridor, characterized in that: The following steps are involved: S01. Divide the corridor into a main truss pre-installation unit, a lifting unit and a post-installation unit; S02. Install the main truss pre-installed unit of the corridor: hoist and weld the components of the main truss pre-installed unit from both ends to the middle in batches by crane, place them on the brackets, and weld them to the pre-buried steel frame columns of the main structure; S03. Install the lifting platform: Use the high-altitude bulk method to install the lifting platform, weld the lifting platform with the connecting rod and the main truss pre-installed unit to form a stable system; S04. Install the tire frame: determine the tire frame installation position on the ground directly below the projection surface of the steel structure lifting unit installation position; S05. Assemble the lifting unit of the corridor above the tire frame: install the lifting unit of the corridor step by step from bottom to top and from the middle to both sides; S06, Lifting preparation: Install the lower lifting point sling, upper lifting sling and steel strand; S07, Formal lifting: adopt the synchronous lifting and unloading position control strategy of oil pressure balance of lifting points, structural posture adjustment, synchronous displacement control, and sequential unloading and positioning; S08. Installation of the lifting unit of the corridor: Use a crane to lift the supplementary section to the designed position and weld it with the lifting unit and pre-installed unit; S09. Installation of rear-mounted units: lift and install the rear-mounted units in order from top to bottom; S10. Unloading: The hydraulic lifting system equipment is depressurized synchronously until the steel strands are completely relaxed; the hydraulic lifting system equipment and related temporary measures are dismantled.

2. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 1 is characterized in that: The step S01 specifically includes: Step 101: Determine the segmented positions of the corridor according to the structural characteristics and construction requirements of the corridor; Step 102, dividing the corridor into a main truss pre-installed unit, a lifting unit and a rear-installed unit, wherein the main truss pre-installed unit is located in the middle part of the corridor, the lifting units are located on both sides of the main truss pre-installed unit, and the rear-installed unit is located outside the lifting unit; Step 103, according to the segmented location, prepare detailed construction drawings, including the specific size, connection method and installation sequence of each unit; Step 104: Number each unit and formulate a corresponding installation plan to ensure that the connection and installation sequence between the units meet the engineering requirements.

3. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 2 is characterized in that: The step S02 specifically includes: Step 201: transport the components of the main truss pre-assembly unit to the construction site according to the construction drawings; Step 202: Use a crane to hoist the components of the main truss pre-assembly unit from both ends to the middle in batches; Step 203: weld the hoisted components according to the design requirements to ensure that the welding quality meets the engineering standards; Step 204, placing the welded main truss pre-assembled unit on the pre-installed corbel; Step 205, welding the main truss pre-installed unit to the pre-buried steel frame column of the main structure to ensure a firm and reliable connection.

4. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 3 is characterized in that: The step S03 specifically includes: Step 301: Prepare installation drawings of the lifting platform according to design requirements; Step 302: Use the high-altitude bulk method to hoist the components of the lifting platform to the designated positions in sequence; Step 303: assemble and weld the components of the lifting platform according to the installation drawings; Step 304, welding the assembled lifting platform and the connecting rod; Step 305, welding the lifting platform and the main truss pre-assembled unit to form a stable overall system; Step 306: Inspect and test the welding parts to ensure the stability and safety of the lifting platform.

5. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 4 is characterized in that: The step S04 specifically includes: Step 401, determining the projection surface of the installation position of the steel structure lifting unit at the construction site; Step 402, measuring and laying out the ground directly below the projection surface to clearly mark the tire frame installation position; Step 403, determining the specific installation point of the tire frame according to the installation projection position of each column of the corridor; Step 404: Perform foundation treatment at the determined installation point to ensure that the ground is flat and has sufficient load-bearing capacity; Step 405: transport the tire frame components to the installation location according to the design requirements; Step 406: Assemble and fix the components of the tire frame according to the installation sequence to ensure the stability and load-bearing capacity of the tire frame.

6. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 5 is characterized in that: The step S05 specifically includes: Step 501: transport the components of the lifting unit of the corridor to the top of the tire frame according to the construction drawings; Step 502: Install the lifting units of the corridor step by step from bottom to top and from the middle to both sides according to the design sequence; Step 503: During the assembly process, pay attention to maintaining the balance of the lifting unit to avoid the risk of overturning; Step 504, ensuring that the load-bearing of each tire frame is evenly distributed to prevent potential safety hazards; Step 505: Arrange measurement points at key positions of the lifting unit, and install fiber grating sensors, acceleration capacitance sensors, and three-dimensional anemometers; Step 506: Perform quality inspection and stability test on the installed parts to ensure that the assembly quality meets the engineering requirements.

7. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 6 is characterized in that: The step S06 specifically includes: Step 601: Determine the installation position of the lower suspension point sling according to the design drawing; Step 602: Install the lower hanging point sling according to the requirements of the three-view drawing of the lower hanging point sling; Step 603: Install the lifting device on the lifting platform to ensure that its position and angle meet the design requirements; Step 604, connect the steel strand to the lifting platform to ensure that the connection is firm and reliable; Step 605, connecting the other end of the steel strand to the lower suspension point sling, and adjusting the tension of the steel strand; Step 606: Perform a comprehensive check on all connection points to ensure that the connection is safe and reliable; Step 607: Conduct a comprehensive inspection of the hydraulic lifter, equipment system, and structural system to ensure that the equipment operates normally.

8. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 7 is characterized in that: The step S07 specifically includes: Step 701, start the hydraulic lifting system and start the lifting process; Step 702: Using the displacement sensors installed on the hydraulic lifters, real-time monitoring of the lifting displacement synchronization of each hydraulic lifter; Step 703: After each step of graded loading is completed, suspend the lifting and analyze the key node sensor data; Step 704, ensure that the synchronous lifting displacement distances of the four strands are the same, and the stress, strain and displacement of the key nodes of the lifting unit and the truss pre-installed unit are normal; Step 705: When the lifting unit is about to leave the tire frame, reduce the lifting speed and closely observe the ground clearance of each point; Step 706: If necessary, perform "single-point lifting" to ensure that the lifting unit is stable off the ground; Step 707: When the lifting unit reaches the designed elevation of about 200 mm, the lifting is stopped and each lifting point is fine-tuned to ensure that the structure reaches the designed position accurately.

9. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 8 is characterized in that: The step S08 specifically includes: Step 801: After the hydraulic lifting system equipment is locked and left to stand still and stabilize, prepare for the installation of the subsequent supplementary section; Step 802: Use a crane to lift the subsequent supplementary section to the designed position; Step 803, accurately docking the rear supplementary section with the lifting unit; Step 804, welding the post-supplement segment to the lifting unit and the pre-installation unit to ensure a firm connection; Step 805: After welding is completed, the hydraulic lifting system equipment is kept locked and the steel strand is kept in a tensioned state; Step 806: Read the sensor data of each measuring point and analyze the stress, strain and displacement deformation of the key nodes; Step 807: Based on the analysis results, evaluate the safety and stability of the corridor to ensure that the structure is in a safe state.

10. The method for safely splicing and lifting an asymmetric large-span steel corridor according to claim 9 is characterized in that: The step S09 specifically includes: Step 901: Determine the installation order and position of the rear-mounted unit according to the design drawing; Step 902: lift the rear-mounted units one by one to the installation position from top to bottom using a crane; Step 903, accurately dock each rear-mounted unit with the installed structure; Step 904: After the docking is completed, welding is performed to ensure that the connection is firm and reliable; Step 905: During the installation process, continue to pay attention to the value changes of each sensor; Step 906: Analyze sensor data to evaluate the stability of the corridor structure; Step 907: If any abnormality is found, the installation operation is stopped immediately and necessary adjustment measures are taken; Step 908: After completing the installation of all rear-mounted units, conduct a comprehensive inspection and test of the overall structure; The step S10 specifically includes: Step 1001, ensure that each unit of the corridor is installed and connected to the embedded steel columns of the main structure; Step 1002, complete the heat treatment of all welding parts to ensure that the welding quality meets the requirements; Step 1003: Conduct a comprehensive inspection of the overall structure to confirm that there are no potential safety hazards; Step 1004, start the hydraulic lifting system equipment and start the synchronous decompression process; Step 1005, slowly releasing the pressure of the hydraulic system until the steel strand is completely relaxed; Step 1006: After confirming that the structure has fully loaded, remove the hydraulic lifting system equipment; Step 1007, dismantle all temporary measures and auxiliary equipment related to the lifting; Step 1008: Conduct a final comprehensive inspection and test on the entire corridor structure to ensure that it meets the design requirements and usage standards.

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