A large-volume irregular steel beam hoisting simulation method for complex sea area environment

Abstract

The application discloses a hoisting simulation method for large-volume irregular steel beams in complex sea environment, and belongs to the technical field of large-volume steel structure hoisting, and comprises the following steps: S1, modeling of the steel beam, a crane and a lifting appliance; S2, obtaining a theoretical weight and a theoretical center of gravity of the steel beam; S3, measuring an actual weight and an actual center of gravity of the steel beam; S4, adjusting the theoretical weight and the theoretical center of gravity of the three-dimensional model of the steel beam to the actual weight and the actual center of gravity; S5, setting dynamic parameters, wherein the dynamic parameters comprise the weight of the steel beam, the center of gravity offset, a wind speed and a turbulent wind speed, and the spatial running track and the rotation angle change of the steel beam are simulated; and S6, dividing the hoisting state into three kinds of states, namely, a safe state, a sub-stable state and an unstable state according to the size of the rotation angle. The application can simulate the influence of environmental factors, such as the wind speed and the turbulent wind speed, on hoisting, predict construction risks, formulate a hoisting strategy according to the construction risks, reduce the overturning or falling risk of the large-volume irregular steel beam, and is suitable for complex working conditions such as cross-sea bridges.

Description

Technical Field

[0001] This invention belongs to the field of large-volume steel structure hoisting technology, and specifically relates to a simulation method for hoisting large-volume irregular steel beams in complex marine environments. Background Technology

[0002] Steel structure bridges are characterized by high strength, good seismic performance, high durability, good plasticity, large span, high precision, and low carbon footprint, and are currently widely used in bridge design. Steel structure bridges typically employ modular design, with prefabrication in steel structure factories and assembly on-site. This process features factory production, standardization, and digitalization, avoiding the impact of on-site construction on traffic and the environment, improving project quality, and shortening the construction period.

[0003] In existing steel beam hoisting construction, the first step is to design a calculation sheet, which includes design basis, input loads, working conditions and load combinations, allowable stress of materials, wind load analysis, transverse and longitudinal slope analysis, structural strength calculations, etc. Only after the calculations are approved can the steel truss girder be installed. Then, after the steel beams, hoisting equipment, and other steel structures are fabricated, they are transported to the construction site. After the vessel is anchored and positioned, the bridge crane lowers the hoisting equipment. Before lifting the steel beam, an inclinometer is installed at an appropriate position on the top surface of the steel box girder to observe the longitudinal and transverse incline angles of the steel beam in its initial hoisting posture. Finally, the bridge crane is started to gradually load the steel beam until it is 10 cm away from the support of the transport vessel. At approximately 1 meter, stop lifting and observe the spatial posture of the steel beam. Compare the initial longitudinal slope of the steel beam with the completed longitudinal slope. If the deviation is large, the steel beam must be lowered onto the beam transport vessel. Use the longitudinal adjustment function of the lifting equipment to adjust the initial posture of the steel beam. Once the posture is adjusted to a suitable position, lock the lifting equipment and lift the steel beam again. Observe and compare the initial longitudinal slope of the steel beam with the completed longitudinal slope. Only if the deviation is small can lifting continue. Stop lifting the steel beam when it reaches the design position. Finally, use the vertical lifting, longitudinal amplitude change, and lateral adjustment functions of the bridge deck crane to precisely adjust the spatial posture of the steel beam segments and carry out the steel beam segment docking construction.

[0004] The existing steel beam hoisting schemes have the following problems: 1. The design calculations involve a large amount of calculations, which is time-consuming and labor-intensive; 2. In complex working conditions such as cross-sea bridge construction, environmental factors, such as wind speed and water flow speed, have a significant impact on hoisting operations, and the impact increases with the increase of the steel beam volume. However, the design calculations cannot calculate the specific impact of environmental factors on hoisting operations, which introduces many uncertainties into steel beam hoisting and increases the risk of steel beam overturning or falling accidents; 3. During the hoisting process, it is often necessary to adjust the initial hoisting posture multiple times to avoid large deviations in the longitudinal slope of the steel beam. Summary of the Invention

[0005] The purpose of this invention is to provide a simulation method for hoisting large-volume irregular steel beams in complex marine environments, in order to solve the problems in the above-mentioned background technology, such as the large workload of preparing design calculation sheets, the inability to calculate the impact of environmental factors on hoisting, and the need to adjust the hoisting starting posture multiple times during the hoisting process.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A simulation method for hoisting large-volume irregular steel beams in complex marine environments includes the following steps:

[0008] S1, modeling of steel beams, cranes, and lifting equipment:

[0009] S2. Obtain the theoretical weight and theoretical center of gravity of the steel beam:

[0010] S3. Measure the actual weight and actual center of gravity of the steel beam, and verify the theoretical weight and theoretical center of gravity of the steel beam. The deviation between the actual weight or actual center of gravity and the theoretical weight or theoretical center of gravity must not exceed 1%.

[0011] S4. Adjust the theoretical weight and theoretical center of gravity of the steel beam 3D model to the actual weight and actual center of gravity, and then import the steel beam 3D model, crane and lifting gear model into the dynamics simulation software, and accurately align the steel beam model and the lifting gear model.

[0012] S5. Set dynamic parameters, including steel beam weight, center of gravity offset, wind speed and turbulent wind speed; simulate the spatial trajectory and rotation angle changes of the steel beam under construction environments with different dynamic parameters using dynamic simulation software, and display the real-time rotation angle and corresponding lifting height of the steel beam during the hoisting process;

[0013] S6. Based on the size of the rotation angle, three lifting states are divided: safe, semi-stable, and unstable. In the safe state, the rotation angle is less than 10°; in the semi-stable state, the rotation angle is 10-20°; in the unstable state, the rotation angle is greater than 20°. Lifting operations are not recommended in unstable conditions.

[0014] Furthermore, the steel beam includes a steel truss beam and a steel box beam; the steel truss beam is positioned above the steel box beam and is integrated with the steel box beam.

[0015] Furthermore, it also includes step S7, real-time monitoring of hoisting: During the hoisting process, a collection device is used to collect information such as lifting height, wind speed, and turbulent wind speed in real time. The rotation angle of the steel beam is obtained through dynamic simulation software and displayed, so that the operators can determine the real-time construction status of the actual hoisting.

[0016] Furthermore, in step S2, the material specific gravity of each steel component of the steel beam is assigned using 3D modeling software to obtain the weight of each component. The weight is then statistically analyzed using the 3D modeling software to obtain the theoretical weight of the steel beam. Finally, the theoretical center of gravity of the steel beam is calculated and analyzed using the software.

[0017] Furthermore, step S3 includes the following steps:

[0018] S31. Lifting steel beam: Use jacks to simultaneously lift the steel beam away from the temporary support;

[0019] S32. Install sensors: After the steel beam is lifted into place, install sensors at the junction of the web of the lower chord longitudinal beam and the transverse diaphragm of the steel box girder, and place pads on the upper and lower parts of the sensors.

[0020] S33. Sensor reading: Record the initial reading of the sensor, then lower the jack synchronously and observe whether there is any abnormality at the sensor contact point. After the jack is completely separated from the steel beam and the sensor reading is stable, read the sensor data and record it.

[0021] S34. Repeat steps S31-S33, repeating the measurement a number of times that is not less than the number of sensor settings, and take the average value of the sensor data as the actual weight and actual center of gravity.

[0022] S35. Compare the actual weight and actual center of gravity with the theoretical center of gravity and theoretical center of gravity respectively. If the deviation is within 1%, it proves that the model accuracy is within the allowable error range. If the deviation exceeds 1%, and the steel beam itself is manufactured without error, the modeling process needs to be checked, the model needs to be corrected according to the actual steel beam, and the theoretical center of gravity and theoretical center of gravity need to be obtained again.

[0023] Furthermore, in step S32, at least eight sensors are spaced at intervals.

[0024] Furthermore, in step S5, the center of gravity offset is the expected deviation between the actual center of gravity of the hoisted steel beam and the center of gravity of the model.

[0025] Furthermore, in step S1, firstly, steel beam processing drawings are prepared according to the design drawings, and the processing drawings are directly imported into the 3D modeling software. The 3D modeling software is used to create a 1:1 3D model of the steel beam. Then, according to the dimensions of the crane and lifting gear, a 1:1 3D model is created using the 3D modeling software. The material specific gravity of the lifting gear model is then assigned to determine the theoretical weight of the lifting gear.

[0026] Furthermore, the crane includes a frame, a traction drive mechanism, a fixed pulley, and a movable pulley; the frame is a diamond-shaped bridge deck frame, with its bottom fixedly connected to the bridge deck; a traction rope is provided on the traction drive mechanism; the fixed pulley is located at the top of the frame; the movable pulley is located below the fixed pulley; and the traction rope is wound around the fixed pulley and the movable pulley.

[0027] Furthermore, the lifting device is a triangular lifting device, including a support, a lower connecting seat, an annular sling, and an upper connecting seat; the support is located below the movable pulley and is formed by the interlaced connection of cross beams and longitudinal beams; the upper and lower ends of the annular sling are connected to the movable pulley and the support respectively through the upper connecting seat and the lower connecting seat.

[0028] The present invention has the following beneficial effects:

[0029] 1. The present invention provides a simulation method for hoisting large-volume irregular steel beams in complex marine environments. It can simulate the impact of environmental factors, such as wind speed and turbulent wind speed, on hoisting, conduct war games in advance, predict construction risks, and formulate hoisting strategies based on construction risks to reduce the risk of overturning or falling off large-volume irregular steel beams. It is applicable to complex working conditions such as cross-sea bridges.

[0030] 2. The present invention provides a simulation method for hoisting large-volume irregular steel beams in complex marine environments. The simulation software can provide guidance for the initial hoisting posture of the steel beams, reduce the number of adjustments during the hoisting process, and improve hoisting efficiency.

[0031] 3. The present invention provides a simulation method for hoisting large-volume irregular steel beams in complex marine environments. During the hoisting process, a collection device is used to collect information such as lifting height, wind speed, and turbulent wind speed in real time. The rotation angle of the steel beam is obtained through dynamic simulation software and displayed, so that the operator can determine the real-time construction status of the actual hoisting and avoid hoisting risks caused by sudden and significant changes in environmental factors.

[0032] 4. The present invention provides a simulation method for hoisting large-volume irregular steel beams in complex marine environments. After modeling, the theoretical weight and theoretical center of gravity of the model are compared with the actual weight and actual center of gravity, which can improve the model accuracy and its prediction accuracy. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram of the steel beam involved in the present invention from a first-view perspective;

[0034] Figure 2 This is a schematic diagram of the cooperation between the steel beam and the lifting device from a second perspective, as per the present invention.

[0035] Figure 3 This is a schematic diagram of the combination of the crane and lifting device involved in the present invention.

[0036] In the diagram: 1-steel beam, 11-steel truss beam, 12-steel box girder, 2-crane, 3-lifting gear. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1 , 2 As shown, this invention provides a simulation method for hoisting large-volume irregular steel beams in complex marine environments. The steel beam 1 includes a steel truss 11 and a steel box girder 12. The steel truss 11 is positioned above the steel box girder 12 and integrated with it. The steel beam 1 has a volume and weight far exceeding that of conventional bridges, and its irregular shape means that wind speed and turbulent wind speed have a significant impact on its hoisting operation. The hoisting simulation method includes the following steps:

[0039] Modeling of S1, steel beam 1, crane 2 and lifting device 3: First, prepare the processing drawings of steel beam 1 according to the design drawings, and directly import the processing drawings into the 3D modeling software. Use the 3D modeling software to create a 1:1 3D model of steel beam 1; then, according to the dimensions of crane 2 and lifting device 3, use the 3D modeling software to create a 1:1 3D model, and then assign material specific gravity values ​​to the lifting device 3 model to determine the theoretical weight of lifting device 3;

[0040] S2. Statistical analysis of the 3D model of steel beam 1 to obtain the theoretical weight and theoretical center of gravity of steel beam 1: Assign material specific gravity values ​​to each steel component of steel beam 1, including accessories, temporary matching parts, and original lifting lugs of steel beam 1, using 3D modeling software to obtain the weight of each component. Statistical analysis of the weight using 3D modeling software yields the theoretical weight of steel beam 1. The theoretical center of gravity of steel beam 1 is then calculated and analyzed using the software.

[0041] S3. Measure the actual weight and center of gravity of steel beam 1, and verify the theoretical weight and center of gravity of steel beam 1 to ensure the accuracy of the model. The deviation between the actual weight or center of gravity and the theoretical weight or center of gravity should not exceed 1%. If it exceeds 1%, the modeling process needs to be re-examined to ensure its correctness.

[0042] S31, Lifting Steel Beam 1: Use jacks to simultaneously lift steel beam 1 about 300mm away from the temporary support;

[0043] S32. Install sensors: After the steel beam 1 is lifted into place, install sensors at the junction of the web (side web) of the lower chord longitudinal beam of the steel box girder 12 and the transverse diaphragm. Place pads on the upper and lower parts of the sensors to increase the bearing area with the steel beam 1 and the temporary support, so as to ensure that the force of each part meets the requirements when the steel beam 1 is weighed. Preferably, at least 8 sensors are set at intervals.

[0044] S33. Record the initial reading of the sensor, then lower the jack synchronously and observe whether there is any abnormality at the sensor contact point. After the jack is completely separated from the steel beam 1, stop for 3 minutes. After the sensor reading stabilizes, read the sensor data and record it. At the same time, observe whether the temporary support and the contact point between the bottom surface of the steel beam 1 and the sensor are deformed.

[0045] S34. Repeat steps S31-S33, repeating the measurement a number of times that is not less than the number of sensors set, and take the average value of the sensor data obtained from multiple measurements as the actual weight and actual center of gravity.

[0046] S35. Compare the actual weight and actual center of gravity with the theoretical center of gravity and theoretical center of gravity respectively. If the deviation is within 1%, it proves that the model accuracy is within the allowable error range. If the deviation exceeds 1%, and the steel beam 1 itself is manufactured without error, the modeling process needs to be checked, the model needs to be corrected according to the actual steel beam 1, and the theoretical center of gravity and theoretical center of gravity need to be obtained again.

[0047] S4. Adjust the theoretical weight and theoretical center of gravity of the three-dimensional model of steel beam 1 to the actual weight and actual center of gravity, and then import the three-dimensional model of steel beam 1, crane 2 and lifting device 3 into the dynamics simulation software, and accurately align the steel beam 1 model with the lifting device 3 model.

[0048] S5. Set dynamic parameters, including the weight of steel beam 1, center of gravity offset, wind speed and turbulent wind speed. Simulate the spatial trajectory and rotation angle changes of steel beam 1 under construction environments with different dynamic parameters using dynamic simulation software, and display the real-time rotation angle and corresponding lifting height of steel beam 1 during the hoisting process; where, the center of gravity offset is the expected deviation between the actual hoisted center of gravity of steel beam 1 and the model center of gravity.

[0049] S6. Based on the size of the rotation angle, three lifting states are identified: safe, semi-stable, and unstable. In the safe state, the rotation angle is less than 10°, and the lifting operation is safe and stable. In the semi-stable state, the rotation angle is between 10-20°, and the lifting operation is relatively stable, but continuous monitoring by the operator is required. In the unstable state, the rotation angle is greater than 20°, and the lifting operation is unstable. Lifting operations are not recommended under these conditions. If lifting is necessary, the lifting must be stopped immediately when the rotation angle exceeds 20° until the rotation angle of steel beam 1 returns to within 20° before further stabilizing lifting can be carried out.

[0050] After inputting the dynamic parameters of the hoisting environment into the dynamic simulation software, operators can understand the spatial trajectory and rotation angle changes of steel beam 1 in advance. Based on the rotation angle, they can confirm whether hoisting operations can be carried out under this condition. If the hoisting process is unstable, it is not recommended to carry out the hoisting operation; if the hoisting process is not unstable, the hoisting operation can proceed. This simulation method can predict the impact of environmental factors on hoisting operations and determine the hoisting strategy. During the hoisting process, when the hoisting height reaches the height of the sub-steady state obtained by the simulation software, continuous monitoring and control of the lifting speed are necessary to prevent steel beam 1 from being significantly rotated due to sudden changes in environmental factors. In addition, the simulation software can provide guidance for the initial hoisting posture of steel beam 1, reducing the number of adjustments during the hoisting process.

[0051] Preferably, a simulation method for hoisting large-volume irregular steel beams in complex marine environments further includes step S7, real-time hoisting monitoring: During the hoisting process, a collection device is used to collect information such as lifting height, wind speed, and turbulent wind speed in real time. The rotation angle of the steel beam 1 is obtained through dynamic simulation software and displayed, so that the operator can determine the real-time construction status of the actual hoisting and avoid hoisting risks caused by sudden and significant changes in environmental factors.

[0052] Among them, such as Figure 3 As shown, the crane 2 includes a frame, a traction drive mechanism, a fixed pulley, and a movable pulley; the frame is a diamond-shaped bridge deck frame, and its bottom is fixed to the bridge deck; a traction rope is installed on the traction drive mechanism; the fixed pulley is installed on the top of the frame; the movable pulley is installed below the fixed pulley; the traction rope is wound around the fixed pulley and the movable pulley, and the lifting and lowering movement of the movable pulley is realized by the release and retraction of the traction rope.

[0053] The lifting device 3 is a triangular lifting device, including a support, a lower connecting seat, a ring sling and an upper connecting seat; the support is set below the movable pulley and is composed of cross beams and longitudinal beams connected in an alternating manner; the upper and lower ends of the ring sling are connected to the movable pulley and the support respectively through the upper connecting seat and the lower connecting seat.

[0054] Crane 2 and lifting device 3 work together to lift extremely heavy components.

[0055] Taking a cross-sea bridge project as an example, the actual steel beam 1 is 19m long, 48.8m wide, and 17.5m high, weighing 883.6t. Among them, the steel box girder 12 is 3m high and the steel truss girder 11 is 14.5m high. After modeling at a 1:1 scale, its theoretical weight is obtained as 884.0t. The distances from the center of gravity to the two ends in the length direction are 9.33m and 9.67m, respectively. The short axis is offset to the west by 224mm, and the distance to the top of the steel beam 1 is 4.064m. The calculation shows that the deviation of the actual center of gravity from the theoretical center of gravity in the length direction is 19mm, the deviation in the short direction is 13mm, and the deviation of the theoretical weight from the actual weight is 0.4t. All deviations are within the allowable range, indicating that the model can be applied. Then, the theoretical weight and theoretical center of gravity of the three-dimensional model of steel beam 1 are adjusted to the actual weight and actual center of gravity, and the working conditions of steel beam 1 under different center of gravity offsets, wind speeds, and turbulent wind speeds are simulated.

[0056] Condition 1: In step S5, input the dynamic parameters: weight of steel beam 1 883.6t, center of gravity offset 0cm, wind speed 0cm / s, turbulent wind speed 0cm / s. It is found that the rotation angle of steel beam 1 during the hoisting process is in the range of -0.5° to 0.5°, and the whole process is in a safe state.

[0057] Condition 2: In step S5, input the following dynamic parameters: weight of steel beam 1 883.6t, center of gravity offset 10cm, wind speed 0cm / s, turbulent wind speed 0cm / s. It is found that the maximum rotation angle of steel beam 1 during hoisting is 1.3°, and the whole process is in a safe state.

[0058] Condition 3: In step S5, input the following dynamic parameters: weight of steel beam 1 883.6t, center of gravity offset 0cm, wind speed 1000cm / s (approximately level 5 wind force, wind direction is directly towards steel beam 1), turbulent wind speed 0cm / s. It is found that the maximum rotation angle of steel beam 1 during hoisting is 13°. The whole process includes safe state and sub-stable state.

[0059] Condition 4: In step S5, input the following dynamic parameters: weight of steel beam 1 883.6t, center of gravity offset 0cm, wind speed 0cm / s, turbulent wind speed 1000cm / s (approximately level 5 wind force, with turbulent wind direction). It is found that the maximum rotation angle of steel beam 1 during hoisting is 8°, and the whole process is in a safe state.

[0060] Condition 5: In step S5, input the following dynamic parameters: weight of steel beam 1 883.6t, center of gravity offset 0cm, wind speed 1000cm / s, turbulent wind speed 1000cm / s (the combined effect of wind speed and turbulent wind speed is equivalent to a level 5-6 wind, with turbulent wind direction), and obtain that the maximum rotation angle of steel beam 1 during hoisting is 15°. The entire process includes a safe state and a sub-stable state.

[0061] Condition 6: In step S5, input the following dynamic parameters: weight of steel beam 1 883.6t, center of gravity offset 10cm, wind speed 1000cm / s, turbulent wind speed 1000cm / s (the combined effect of wind speed and turbulent wind speed is equivalent to a force 5-6 wind, with turbulent wind direction), and obtain that the maximum rotation angle of steel beam 1 during hoisting is 17°. The entire process includes a safe state and a sub-stable state.

[0062] Condition 7: In step S5, input the following dynamic parameters: weight of steel beam 1 883.6t, center of gravity offset 10cm, wind speed 2000cm / s, turbulent wind speed 2000cm / s (the combined effect of wind speed and turbulent wind speed is equivalent to a force 8 wind, with turbulent wind direction). It is found that the maximum rotation angle of steel beam 1 during hoisting is 29°. The entire process includes a safe state, a substable state, and an unstable state. Hoisting operations are not recommended under this condition.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A simulation method for hoisting large-volume irregular steel beams in complex marine environments, characterized in that, Includes the following steps: Modeling of S1, steel beam (1), crane (2) and lifting equipment (3): S2. Obtain the theoretical weight and theoretical center of gravity of the steel beam (1): S3. Measure the actual weight and actual center of gravity of the steel beam (1), and verify the theoretical weight and theoretical center of gravity of the steel beam (1). The deviation between the actual weight or actual center of gravity and the theoretical weight or theoretical center of gravity should not exceed 1%. S4. Adjust the theoretical weight and theoretical center of gravity of the three-dimensional model of the steel beam (1) to the actual weight and actual center of gravity, and then import the three-dimensional model of the steel beam (1), the crane (2) and the lifting device (3) into the dynamic simulation software, and accurately align the steel beam (1) model with the lifting device (3) model. S5. Set dynamic parameters, including the weight of the steel beam (1), center of gravity offset, wind speed and turbulent wind speed; simulate the spatial trajectory and rotation angle changes of the steel beam (1) under different dynamic parameters in the construction environment through dynamic simulation software, and display the real-time rotation angle and corresponding lifting height of the steel beam (1) during the hoisting process; S6. Based on the size of the rotation angle, three lifting states are divided: safe, semi-stable, and unstable. In the safe state, the rotation angle is less than 10°; in the semi-stable state, the rotation angle is 10-20°; in the unstable state, the rotation angle is greater than 20°. Lifting operations are not recommended in unstable conditions.

2. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 1, characterized in that, The steel beam (1) includes a steel truss beam (11) and a steel box beam (12); the steel truss beam (11) is located above the steel box beam (12) and is integrated with the steel box beam (12).

3. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 1, characterized in that, It also includes step S7, real-time monitoring of hoisting: During the hoisting process, a collection device is used to collect information such as lifting height, wind speed, and turbulent wind speed in real time. The rotation angle of the steel beam (1) is obtained through dynamic simulation software and displayed, so that the operator can determine the real-time construction status of the actual hoisting.

4. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 1, characterized in that, In step S2, the material specific gravity of each steel component of the steel beam (1) is assigned by the three-dimensional modeling software, the weight of each component is obtained, and the weight is statistically analyzed by the three-dimensional modeling software to obtain the theoretical weight of the steel beam (1). The theoretical center of gravity of the steel beam (1) was then calculated and analyzed using software.

5. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 2, characterized in that, Step S3 includes the following steps: S31, Lifting steel beam (1): Use jacks to lift steel beam (1) simultaneously from the temporary support; S32. Install sensors: After the steel beam (1) is lifted into place, install sensors at the junction of the web of the lower chord longitudinal beam and the transverse diaphragm of the steel box beam (12), and place pads on the upper and lower parts of the sensors. S33, Sensor reading: Record the initial reading of the sensor, then lower the jack synchronously and observe whether there is any abnormality at the sensor contact point. After the jack is completely separated from the steel beam (1) and the sensor reading is stable, read the sensor data and record it. S34. Repeat steps S31-S33, repeating the measurement a number of times that is not less than the number of sensor settings, and take the average value of the sensor data as the actual weight and actual center of gravity. S35. Compare the actual weight and actual center of gravity with the theoretical center of gravity and theoretical center of gravity respectively. If the deviation range is within 1%, it proves that the model accuracy is within the allowable error range. If the deviation range exceeds 1%, and the steel beam (1) itself is manufactured without error, it is necessary to check the modeling process, correct the model according to the actual steel beam (1), and re-obtain the theoretical center of gravity and theoretical center of gravity.

6. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 5, characterized in that, In step S32, at least eight sensors are set at intervals.

7. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 1, characterized in that, In step S5, the center of gravity offset is the expected deviation between the center of gravity of the actual hoisted steel beam (1) and the center of gravity of the model.

8. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 1, characterized in that, In step S1, firstly, the steel beam (1) processing drawings are prepared according to the design drawings. The processing drawings are directly imported into the three-dimensional modeling software. The three-dimensional modeling software is used to establish a 1:1 three-dimensional model of the steel beam (1). Then, according to the dimensions of the crane (2) and the lifting device (3), a 1:1 three-dimensional model is established using the three-dimensional modeling software. The material specific gravity of the lifting device (3) model is assigned to determine the theoretical weight of the lifting device (3).

9. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 1, characterized in that, The crane (2) includes a frame, a traction drive mechanism, a fixed pulley and a movable pulley; the frame is a diamond-shaped bridge deck frame, and its bottom is fixed to the bridge deck; a traction rope is provided on the traction drive mechanism; the fixed pulley is located at the top of the frame; the movable pulley is located below the fixed pulley; the traction rope is wound around the fixed pulley and the movable pulley.

10. The method for simulating the hoisting of large-volume irregular steel beams in complex marine environments according to claim 1, characterized in that, The lifting device (3) is a triangular lifting device, including a support, a lower connecting seat, a ring sling and an upper connecting seat; the support is set below the movable pulley and is formed by crossbeams and longitudinal beams connected in an alternating manner; the upper and lower ends of the ring sling are connected to the movable pulley and the support respectively through the upper connecting seat and the lower connecting seat.

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