A method and system for analyzing the tower hoisting process of an inner-suspension and outer-guying pole group under wind load conditions

Abstract

The application discloses a kind of wind load conditions under inner suspension outer cable-stayed embrace pole group tower hoisting process analysis method and system, comprising: establishing inner suspension outer cable-stayed embrace pole finite element model, hoisting process is divided into three kinds of working conditions;Calculate the wind load applied to embrace pole under different working conditions;The wind load calculated under different working conditions is applied to the embrace pole finite element model, and post-processing is carried out;According to the post-processing result, the specifications of the cable system and the early warning value are determined.The embodiment method and system of the application analyze the curve of the tension of the cable system changing with the increase of height during the process of hoisting a single tower piece from the lowest point to the highest point by inner suspension outer cable-stayed embrace pole, determine the specifications of the tools used in construction by the maximum tension, and determine the early warning value of the monitoring system during construction by the curve change, thereby providing a reference for construction monitoring.

Description

Technical Field

[0001] This invention relates to the field of construction technology for suspended external guyed towers in transmission lines, specifically to an analysis method and system for the hoisting process of suspended external guyed towers under wind load conditions. Background Technology

[0002] The following research has been conducted on the erection of suspended mast towers for power transmission lines: 1. Wind vibration response analysis of an internally suspended, externally guyed gantry. A gantry model was established using finite element method (FEM) software. Wind speed time history curves at different heights were obtained using MATLAB software. Wind load time history curves for each segment of the gantry were calculated. Modal analysis was performed on the finite element model of the gantry to obtain the first five main vibration modes and natural frequencies. The analysis showed that the torsional stiffness of the gantry was relatively weak, and the displacement of the upper and middle parts of the gantry was relatively large, which should be closely monitored during construction.

[0003] 2. Study on the wind resistance of the tower-pole coupling system. Static analysis of the tower-pole coupling system was conducted using ANSYS software to determine the maximum wind speed that the system can withstand while ensuring safety, and to define the applicable range of the pole, thus providing a basis for the preparation of the tower erection construction plan.

[0004] 3. Study on the wind-induced response of a long-span steel pipe tower with double horizontal arms. Based on high-frequency balance force measurement tests in a wind tunnel, the shape coefficient of the tower structure under different wind angles and horizontal arm attitudes was obtained. A finite element model of the double horizontal arm tower under typical working conditions throughout the construction process was established. The dynamic time history response and wind vibration coefficient of the tower structure under various construction conditions and different wind directions were calculated and compared with the wind vibration coefficient values ​​in the design code for tall structures.

[0005] The above studies on the erection of suspended gantry towers for transmission lines have all investigated the overall situation of the suspended gantry under wind load conditions, but have not considered the tension changes of the gantry cable system during the lifting of tower sections. During gantry operation, four external guy wires connect the top of the gantry to the ground to maintain the gantry's stress balance, four support ropes connect the bottom of the gantry to the main tower structure to support the gantry, and one lifting rope bears the entire weight of the lifted tower section. This cable system, composed of nine ropes, plays a crucial role in the construction of suspended gantry towers with external guy wires. If any rope breaks due to overload, it will lead to serious construction accidents such as gantry collapse or tower section falling. Therefore, it is necessary to analyze the stress changes of the cable system during the lifting of a single tower section from the lowest point to the highest point using a suspended gantry tower with external guy wires.

[0006] During the lifting of tower sections, the tension on the gantry cable system is complex. The tension on the cable system is not only related to the weight of the tower sections being lifted, but also to the weight of the gantry itself, the gantry tilt angle, the angle of the guy wires supporting the lifting ropes, the wind speed at the construction site, and the wind speed at different heights.

[0007] The internally suspended, externally guyed gantry tower erection method is widely used in power transmission line construction. Wind load is a major influencing factor in outdoor construction environments. Wind forces can cause swaying of hoisting equipment, increasing the burden on the cable system and posing a threat to construction personnel and equipment. To ensure construction safety, it is essential to conduct mechanical simulation analysis of the internally suspended, externally guyed gantry tower erection under wind load conditions. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention proposes an analysis method and system for the hoisting process of internally suspended externally guyed gantry towers under wind load conditions. For construction sites under different working conditions, finite element model analysis is used to analyze the tension of the external guy wires, supporting ropes, and hoisting ropes during the gantry lifting process. The results are compared with those calculated using empirical formulas to determine the applicable scope of the empirical formulas, providing a reference for the selection of tools and equipment before construction and for real-time monitoring data during construction of internally suspended externally guyed gantry towers.

[0009] The present invention proposes the following technical solution: In a first aspect, embodiments of the present invention provide a method for analyzing the hoisting process of an internally suspended externally guyed tower assembly under wind load conditions, including: A finite element model of an internally suspended externally mandrel-supported gantry crane was established, and the lifting process was divided into three working conditions; Calculate the wind loads applied to the pole under different working conditions; The wind loads calculated under different working conditions are applied to the finite element model of the pole and then post-processed. Based on the post-processing results, determine the tooling specifications and warning values ​​for the cable system.

[0010] Furthermore, a finite element model of the internally suspended externally mandrel gantry was established, and the lifting process was divided into three working conditions: Establish a finite element model of the internally suspended externally wired gantry; Based on the state of the internal suspension and external guy wire pole, the lifting process is divided into three types of working conditions.

[0011] The formula for calculating the wind load applied to the mast under different working conditions is as follows: In the formula, For wind loads acting on the pole under different working conditions, This refers to the wind force coefficient. This is the coefficient for wind pressure height variation; This is the basic wind pressure; The windward area is perpendicular to the wind direction.

[0012] Furthermore, basic wind pressure The calculation formula is: In the formula, air density, This refers to the local wind speed.

[0013] Furthermore, the wind pressure height variation coefficient The calculation formula is: In the formula, This refers to the height above the ground.

[0014] Furthermore, the windward area perpendicular to the wind direction The calculation formula is: In the formula, The windward area of ​​the front truss; The windward area of ​​the rear truss; This is the wind resistance reduction factor of the front truss to the rear truss.

[0015] Furthermore, the wind loads calculated under different working conditions are applied to the finite element model of the pole, and post-processing is performed, including: Simulation of the tension values ​​of the pull wire and the supporting rope in the finite element model under different working conditions; Simulations show the tension values ​​of the lifting rope and the outer guy wire on the opposite side of the tower section in the finite element model as a function of the height of the lifting tower section under different working conditions. Calculate the empirical values ​​of tension for the guy wire, support rope, and lifting rope under different working conditions; The calculation results of empirical formulas under different working conditions are compared with the simulation analysis results of finite element models.

[0016] Furthermore, the empirical values ​​for the tension of the guy wire, support rope, and lifting rope under different working conditions include: 1) Calculate the forces on the guy wires of the pole. In the formula, The resultant force is the tension of the external tension line on the stressed side. The angle between the resultant tension of the guy wire on the stressed side and the ground. The angle of inclination of the pole. The angle between the lifting rope and the vertical direction. For the force on the lifting rope assembly; 2) Calculate the force on the pole support rope. In the formula, The resultant force of the side-supporting ropes of the lifting components of the gantry crane. The resultant force of the supporting ropes on the opposite side of the lifting component of the gantry crane. To support the weight of the pole, The axial pressure of the mast is calculated comprehensively. 3) Calculate the forces acting on the lifting ropes of the gantry crane. In the formula, For the lifting rope to bear the force; The weight of the suspended component; To control the angle between the rope and the ground.

[0017] Secondly, embodiments of the present invention provide an analysis system for the hoisting process of an internally suspended externally guyed gantry tower under wind load conditions, including a model building module, a working condition classification module, a wind load calculation module, a post-processing module, and an analysis module. The model building module is used to build a finite element model of the internally suspended externally guyed gantry tower. The working condition classification module is used to classify the working conditions of the hoisting process. The wind load calculation module is used to calculate the wind load applied to the gantry tower under different working conditions. The post-processing module is used to post-process the wind load applied to the finite element model of the gantry tower under different working conditions. The analysis module is used to determine the specifications of the tools and equipment and the warning values ​​of the cable system.

[0018] Furthermore, the post-processing module includes a simulation analysis submodule, an empirical analysis submodule, and a comparison submodule; The simulation analysis submodule is used to simulate the force and variation curves of the finite element model under different working conditions. The empirical analysis submodule is used to calculate the empirical values ​​of the system force under different working conditions using empirical formulas. The comparison submodule is used to compare the calculation results of the empirical formulas with the simulation analysis results of the finite element model under different working conditions.

[0019] Furthermore, the simulation analysis submodule simulates the force and variation curves of the finite element model under different working conditions, including: Simulation of the tension values ​​of the pull wire and the supporting rope in the finite element model under different working conditions; Simulations showed the tension values ​​of the lifting rope and the outer guy wire on the opposite side of the tower section in the finite element model as a function of the height of the lifting tower section under different working conditions.

[0020] Beneficial effects: The present invention provides a method and system for analyzing the lifting process of an internally suspended, externally guyed gantry tower under wind load conditions. For construction sites under different working conditions, it uses a finite element model to analyze the tension of the external guy wires, supporting ropes, and lifting ropes during the gantry lifting process, and compares the results with those calculated using empirical formulas. The present invention analyzes the curve of the tension in the cable system as the height increases during the lifting of a single tower section from the lowest point to the highest point using an internally suspended, externally guyed gantry. The maximum tension value is used to determine the specifications of the tools used in construction, and the curve changes are used to determine the early warning values ​​of the monitoring system during construction, thus providing a reference for construction monitoring. Attached Figure Description

[0021] Figure 1 A simplified flowchart of the method provided in this embodiment of the invention; Figure 2 A flowchart of the method provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the finite element model of the internally suspended externally maneuvering pole provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the pole segmentation provided in an embodiment of the present invention; Figure 5 This is a graph showing the change in lifting rope tension with height under the second type of working condition provided in this embodiment of the invention. Figure 6 This is a curve showing the change in tension of the external guy wire as a function of height under the second type of working condition provided in this embodiment of the invention; Figure 7 The lifting rope tension versus height curve under the third type of working condition provided in this embodiment of the invention; Figure 8 This is a curve showing the variation of external tension with height under the third type of working condition provided in this embodiment of the invention. Figure 9 The force diagram of the internally suspended externally guyed tower assembly provided in the embodiment of the present invention; Figure 10 This is a schematic diagram of the system structure provided in an embodiment of the present invention. Detailed Implementation

[0022] The present solution will now be described in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 , Figure 2 The method flowchart provided for embodiments of the present invention includes: A finite element model of an internally suspended externally mandrel-supported gantry crane was established, and the lifting process was divided into three working conditions; Calculate the wind loads applied to the pole under different working conditions; The wind loads calculated under different working conditions are applied to the pole finite element model and then post-processed. Based on the post-processing results, determine the tooling specifications and warning values ​​for the cable system.

[0024] A finite element model of an internally suspended, externally guyed gantry was established, and the lifting process was divided into three working conditions: establishing a finite element model of an internally suspended, externally guyed gantry; and dividing the lifting process into three working conditions based on the state of the internally suspended, externally guyed gantry.

[0025] This invention uses an 80kN suspended gantry crane as an example to establish a finite element model of the crane, and then analyzes the crane hoisting process under wind load conditions. The crane has a total length of 44 meters, a self-weight of 4.4 tons, and a maximum working height of 120m. Both ends are 5.7m tapered sections, and the middle section is a 32m standard section (each standard section is 2m long). The crane uses Q235 angle steel, and the standard section uses the following angle steel specifications: main chord L100mm×8mm, straight web members L70mm×5mm, and diagonal web members L56mm×5mm. The main members, diagonal members, and diagonal web members use BEAM188 elements, the supporting rope and external guy wires use LINK180 elements, and the end reinforcement plate of the crane uses SHELL181 elements. The constructed finite element model of the internally suspended externally guyed gantry crane is as follows: Figure 3 As shown.

[0026] Figure 3 In the middle, the external guy wire includes units 4249, 4250, 4251 and 4252, and the supporting rope includes units 4253, 4254, 4255 and 4256.

[0027] In this embodiment of the invention, based on the state of the internally suspended externally manned gantry, the wind load on the gantry, the weight of the lifting tower sections, and the different deviation angles of the gantry, the lifting process is divided into 3 categories and 12 working conditions. Wind load analysis is performed under four conditions: no wind (0 m / s), level 2 wind (3 m / s), level 4 wind (7 m / s), and level 6 wind (10 m / s). Lifting operations are stopped when the wind force exceeds level 6.

[0028] Conditions 1-4 are the first type of conditions: non-working state. Condition 1 is the static non-working state of the gantry when it is not subjected to wind load, and conditions 2-4 are the non-working states of the gantry when it is subjected to wind loads of different magnitudes.

[0029] Working conditions 5-8 are the second type of working conditions: the working state in which the weight of the lifting tower pieces and the tilt angle are increased in turn under the same wind load.

[0030] Working conditions 9-12 are the third type of working conditions: the working state of lifting tower sections of the same weight with the same tilt angle under different wind loads.

[0031] For the above operating conditions, conditions 1-4 are non-working states, and conditions 5-12 are working states.

[0032] According to crane design specifications, calculate the wind loads acting on the boom under different working conditions. The calculation formula is: In the formula, This refers to the wind force coefficient. This is the coefficient for wind pressure height variation; This is the basic wind pressure; The windward area is perpendicular to the wind direction.

[0033] Basic wind pressure The calculation formula is: In the formula, air density, This refers to the local wind speed.

[0034] In this embodiment of the invention, the planar truss is made of single-piece steel sections, therefore the wind force coefficient is taken as... .

[0035] The "Code for Design of Building Structures" (GB50009-2012) stipulates that the calculation formula for the wind pressure height variation coefficient is divided into four categories (A, B, C, and D) based on the ground roughness. Category B refers to fields, villages, forests, hills, and sparsely populated towns and suburban areas. This embodiment of the invention uses Category B terrain to calculate the wind pressure height variation coefficient. The formula is: In the formula, This refers to the height above the ground.

[0036] When wind load acts perpendicularly on the mast from one side, the front truss will block the wind from the rear truss, increasing the total windward area. The calculation formula is: In the formula, in the formula, The windward area of ​​the front truss; The windward area of ​​the rear truss; The wind resistance reduction factor of the front truss to the rear truss is taken in this embodiment of the invention. .

[0037] In this embodiment of the invention, the mast is divided into 1-6 segments from top to bottom according to the maximum working height of the suspended mast: one segment each for the upper and lower conical sections (segment 1 and segment 6 respectively), and four standard sections per segment, for a total of four segments (segment 2 to segment 5 respectively). The mast segmentation diagram is shown below. Figure 4 As shown. When the wind speed is v=10m / s, and it acts vertically on each section of the pole, the magnitudes of the wind loads on each section are as follows: P w1 =622.82N、 P w2 =860.05N P w3 =839.18N P w4 =818.3N、 P w5 =797.43N Pw6 =554.28N.

[0038] The wind loads calculated under different working conditions are applied to the finite element model of the pole, and post-processing is performed, including: Simulation of the tension values ​​of the pull wire and the supporting rope in the finite element model under different working conditions; Simulations show the tension values ​​of the lifting rope and the outer guy wire on the opposite side of the tower section in the finite element model as a function of the height of the lifting tower section under different working conditions. Calculate the empirical values ​​of tension for the guy wire, support rope, and lifting rope under different working conditions; The calculation results of empirical formulas under different working conditions are compared with the simulation analysis results of finite element models.

[0039] Scenario 1: Post-processing under the first type of working condition.

[0040] When the boom is not lifting heavy objects and is in a non-working state, the weight of the boom is transferred to the support assembly through the boom base. The tension on the support assembly is distributed among the four support ropes. The external guy line connects the top of the boom to the ground, balancing the force on the boom and keeping it vertical.

[0041] When wind blows perpendicularly towards the pole from the left side at a 90° angle, different wind loads are applied to the pole in its non-working state. After the wind loads are applied, the tension values ​​of the eight cables of the guy wire and support rope are obtained through calculation and post-processing, as shown in Table 1.

[0042]

[0043] As shown in the table above, due to the weight of the pole, the tension on the supporting rope is greater than that on the outer guy wire. Since the wind blows from the left side of the pole, the tension on the four guy cables on the left side is greater than that on the four guy cables on the right side.

[0044] Scenario 2: Post-processing under the second type of working condition.

[0045] When the gantry crane is operating at its maximum working height of 120m, maintaining a constant wind speed (v=10m / s), finite element analysis is performed on the cable system by varying the weight of the tower sections being lifted and the crane's tilt angle. During tower section lifting, to avoid collisions between the sections and the existing tower body and to facilitate section installation, the gantry crane will tilt at a certain angle, with the direction of tilt changing depending on the position of the lifted tower section.

[0046] To simplify the calculation, it is assumed that the tilting direction of the gantry is in the same plane as the lifting tower and the lifting rope, and the center of the gantry is located on the axis of the tower body.

[0047] The same wind load was applied to the gantry model under four conditions (5-8). After solving and post-processing, the maximum tension values ​​of the eight cables of the external guy wires and supporting ropes during the lifting process were obtained, as shown in Table 2. The changes in the tension values ​​of the lifting ropes and the external guy wires on the opposite side of the tower section with the increase of the tower section lifting height were also obtained, as shown in Table 2. Figure 5 , Figure 6 As shown.

[0048] As shown in the table above, when the tower section is lifted by the gantry crane, the two guy wires opposite to the direction of the tower section are under greater tension, while the two guy wires on the same side of the tower section are in a relaxed state. Furthermore, the tension in the guy wires increases with the weight of the tower section. The force on the supporting rope also increases with the weight of the tower section being lifted, but the change in the weight of the tower section has a relatively small impact on the tension of the supporting rope. Figure 5 , Figure 6 It can be seen that as the lifting height increases, the tension on the lifting rope and the guy wire increases to some extent, but the overall change is not significant. The weight of the lifting tower determines the baseline tension of the lifting rope and the guy wire.

[0049] Scenario 3: Post-processing under the third type of working condition.

[0050] When the gantry crane operates at its maximum working height of 120m, the wind speed at the construction site is changed, and tower sections of the same weight (5t in this embodiment of the invention) are lifted. Finite element analysis is performed on the cable system. After applying different wind loads, and after solving and post-processing, the maximum tension values ​​of the eight cables of the outer guy wire and support rope during the lifting process are obtained as shown in Table 3. The changes in tension on the lifting rope and outer guy wire as the lifting height of the tower section increases are shown in Table 3. Figure 7 , Figure 8 As shown.

[0051]

[0052] As shown in the table above, under strong wind conditions, the tension on the guy wire on the stressed side is much greater than under calm conditions, and it increases with increasing wind speed; the tension on the supporting rope is less affected by wind load. Figure 7 , Figure 8 It can be seen that as the wind speed increases, the tension on the lifting rope and the guy wire changes more drastically with height. When the wind speed is 10 m / s, the difference in the stress variation of the lifting rope is close to 3 kN, and the difference in the stress variation of the guy wire is close to 1 kN.

[0053] In this embodiment of the invention, the stress analysis of the internally suspended externally guyed tower assembly is as follows: Figure 9 As shown, empirical calculations are performed on the cable system, including: 1) Calculate the forces on the guy wires of the pole. In the formula, The resultant force is the tension of the external tension line on the stressed side. The angle between the resultant tension of the guy wire on the stressed side and the ground. The angle of inclination of the pole. The angle between the lifting rope and the vertical direction. This refers to the force exerted on the lifting rope assembly.

[0054] In this embodiment of the invention, due to arrangement errors, the imbalance coefficient of the two guy wires on the force-bearing side is considered to be 1.3. Therefore, the expression for the static tension of a single guy wire on the force-bearing side is: In the formula: It is the angle between the single guy wire on the force-bearing side and its resultant force.

[0055] 2) Calculate the force on the pole support rope. In the formula, The resultant force of the side-supporting ropes of the lifting components of the gantry crane. The resultant force of the supporting ropes on the opposite side of the lifting component of the gantry crane. To support the weight of the pole, This is a comprehensive calculation of the axial pressure on the mast. Comparing the two equations, it can be seen that... Greater than That is, the static tension on the two supporting ropes on the lifting component side of the jib is greater than the static tension on the supporting rope on the other side of the jib, therefore, it is uniformly taken as This serves as the basis for selecting the supporting rope.

[0056] 3) Calculate the forces acting on the lifting ropes of the gantry crane. In the formula, For the lifting rope to bear the force; The weight of the suspended component; To control the angle between the rope and the ground.

[0057] The results of empirical formula calculations under different working conditions are compared with the results of finite element model simulation analysis, as shown in Table 4-6. The maximum static tension of each rope during the lifting process is selected as the comparison value in the finite element analysis results.

[0058]

[0059] As shown in the difference column of Tables 4 and 5, when lifting tower sections of different weights under the same wind load, the greater the weight of the tower section, the greater the difference between the empirical formula calculation results and the finite element model simulation analysis results of the force on the external guy wires and lifting ropes; when lifting the same tower section under different wind loads, the greater the wind load, the greater the difference between the empirical formula calculation results and the finite element model simulation analysis results of the force on the external guy wires and lifting ropes.

[0060]

[0061] As shown in Table 6, the empirical formula calculation results for the supporting rope are greater than the finite element model simulation analysis results under all working conditions.

[0062] Figure 10 The system structure diagram provided in this embodiment of the invention includes a model building module, a working condition classification module, a wind load calculation module, a post-processing module, and an analysis module. The model building module is used to build a finite element model of the internally suspended externally guyed gantry. The working condition classification module is used to classify the working conditions of the lifting process. The wind load calculation module is used to calculate the wind load applied to the gantry under different working conditions. The post-processing module is used to post-process the wind load applied to the finite element model of the gantry calculated under different working conditions. The analysis module is used to determine the tool specifications and warning values ​​of the cable system.

[0063] The post-processing module includes a simulation analysis submodule, an empirical analysis submodule, and a comparison submodule; The simulation analysis submodule is used to simulate the force and variation curves of the finite element model under different working conditions. The empirical analysis submodule is used to calculate the empirical values ​​of the system force under different working conditions using empirical formulas. The comparison submodule is used to compare the calculation results of empirical formulas with the simulation analysis results of the finite element model under different working conditions.

[0064] The simulation analysis submodule simulates the stress and variation curves of the finite element model under different working conditions, including: Simulation of the tension values ​​of the pull wire and the supporting rope in the finite element model under different working conditions; Simulations showed the tension values ​​of the lifting rope and the outer guy wire on the opposite side of the tower section in the finite element model as a function of the height of the lifting tower section under different working conditions.

[0065] The functions and methods of each module in the system of this invention embodiment are consistent, and will not be repeated here.

[0066] The present invention provides a method and system for analyzing the lifting process of an internally suspended, externally guyed gantry tower under wind load conditions. For construction sites under different working conditions, it uses a finite element model to analyze the tension of the external guy wires, supporting ropes, and lifting ropes during the gantry lifting process, and compares the results with those calculated using empirical formulas. The present invention analyzes the curve of the tension in the cable system as the height increases during the lifting of a single tower section from the lowest point to the highest point using an internally suspended, externally guyed gantry. The maximum tension value is used to determine the specifications of the tools used in construction, and the curve changes are used to determine the early warning values ​​of the monitoring system during construction, thus providing a reference for construction monitoring.

[0067] Under conditions of light lifting weight or low wind speed, the stress on the cable system changes little with the lifting height, and the results calculated by the empirical formula are greater than those of the finite element model simulation analysis, making it suitable for actual working conditions.

[0068] Under heavy lifting or high wind speed conditions, the stress on the cable system varies greatly with the lifting height, which is detrimental to the safety of the construction site. The results of finite element model simulation analysis are greater than the results of empirical calculations, and empirical calculation formulas are no longer applicable to actual working conditions. Before construction, the influence of wind load factors must be considered, and the tools and equipment for the cable system must be strictly selected. When using empirical calculation formulas in engineering, attention should be paid to the conditions of use.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for analyzing the hoisting process of an internally suspended externally guyed tower assembly under wind load conditions, characterized in that, The method includes: A finite element model of an internally suspended externally mandrel-supported gantry crane was established, and the lifting process was divided into three working conditions; Calculate the wind loads applied to the pole under different working conditions; The wind loads calculated under different working conditions are applied to the finite element model of the pole and then post-processed. Based on the post-processing results, determine the tooling specifications and warning values ​​for the cable system; The formula for calculating the wind load applied to the mast under different working conditions is as follows: ； In the formula, For wind loads acting on the pole under different working conditions, This refers to the wind force coefficient. This is the wind pressure height variation coefficient; This is the basic wind pressure; The windward area perpendicular to the wind direction; Basic wind pressure The calculation formula is: ； In the formula, air density, Local wind speed; Wind pressure height variation coefficient The calculation formula is: ； In the formula, h Height above the ground; Windward area perpendicular to the wind direction The calculation formula is: ； In the formula, The windward area of ​​the front truss; The windward area of ​​the rear truss; This is the wind resistance reduction factor of the front truss to the rear truss; The wind loads calculated under different working conditions are applied to the finite element model of the pole and post-processed, including: Simulation of the tension values ​​of the pull wire and the supporting rope in the finite element model under different working conditions; Simulations show the tension values ​​of the lifting rope and the outer guy wire on the opposite side of the tower section in the finite element model as a function of the height of the lifting tower section under different working conditions. Calculate the empirical values ​​of tension for the guy wire, support rope, and lifting rope under different working conditions; The calculation results of empirical formulas under different working conditions are compared with the simulation analysis results of finite element models; The empirical values ​​for the tension of the guy wire, support rope, and lifting rope under different working conditions include: 1) Calculate the forces on the guy wires of the pole. ； In the formula, The resultant force is the tension of the external tension line on the stressed side. The angle between the resultant tension of the guy wire on the stressed side and the ground. The angle of inclination of the pole. The angle between the lifting rope and the vertical direction. T For the force on the lifting rope assembly; 2) Calculate the force on the pole support rope. ； In the formula, The resultant force of the side-supporting ropes of the lifting components of the gantry crane. The resultant force of the supporting ropes on the opposite side of the lifting component of the gantry crane. To support the weight of the pole, N The axial pressure of the mast is calculated comprehensively. 3) Calculate the forces acting on the lifting ropes of the gantry crane. ； In the formula, T For the lifting rope to bear the force; G The weight of the suspended component; To control the angle between the rope and the ground.

2. A system for analyzing the process of hoisting an internally suspended externally guyed gantry tower assembly under wind load conditions, characterized in that, According to the method described in claim 1, the system includes a model building module, a working condition classification module, a wind load calculation module, a post-processing module, and an analysis module. The model building module is used to build a finite element model of an internally suspended externally guyed gantry. The working condition classification module is used to classify the working conditions of the lifting process. The wind load calculation module is used to calculate the wind load applied to the gantry under different working conditions. The post-processing module is used to post-process the wind loads applied to the finite element model of the gantry calculated under different working conditions. The analysis module is used to determine the specifications of the tools and equipment and the warning values ​​of the cable system.

3. The analysis system for the tower hoisting process of an internally suspended externally guyed gantry under wind load conditions as described in claim 2, is characterized in that, The post-processing module includes a simulation analysis submodule, an empirical analysis submodule, and a comparison submodule; The simulation analysis submodule is used to simulate the force and variation curves of the finite element model under different working conditions. The empirical analysis submodule is used to calculate the empirical values ​​of the system force under different working conditions using empirical formulas. The comparison submodule is used to compare the calculation results of the empirical formulas with the simulation analysis results of the finite element model under different working conditions.

4. The analysis system for the tower hoisting process of an internally suspended externally guyed gantry under wind load conditions as described in claim 3, is characterized in that, The simulation analysis submodule is used to simulate the force and variation curves of the finite element model under different working conditions, including: Simulation of the tension values ​​of the pull wire and the supporting rope in the finite element model under different working conditions; Simulations showed the tension values ​​of the lifting rope and the outer guy wire on the opposite side of the tower section in the finite element model as a function of the height of the lifting tower section under different working conditions.

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