Reactor building annular steel structure integrated module hoisting mechanism and method

Abstract

The invention discloses a hoisting mechanism and method for an annular steel structure integrated module of a reactor building, and relates to the technical field of hoisting. The lifting device comprises a lifting device, the lifting device is provided with a lifting cable, the lifting cable is connected with a main lifting beam, the bottom of the main lifting beam is provided with a circular transition beam, the circular transition beam is provided with a main sling, and the bottom end of the main sling is connected with an auxiliary sling. The auxiliary slings are provided with outer side auxiliary slings connected with the outer sides of the steel structure integrated modules and inner side auxiliary slings connected with the inner sides of the steel structure integrated modules, the auxiliary slings are provided with stress monitoring and adjusting systems, and the stress monitoring and adjusting systems comprise adjustable pull rods and strain gauges. Compared with a traditional on-site assembly construction mode, the lifting mechanism and method for the annular steel structure integrated module of the reactor building have the advantages that the construction efficiency is greatly improved, the construction period is shortened, meanwhile, the overall quality of module assembly and lifting is guaranteed, reliable technical support is provided for modular construction of a nuclear power plant, and the lifting mechanism and method have good popularization prospects.

Description

Technical Field

[0001] This invention relates to the field of hoisting technology, specifically to a hoisting mechanism and method for an integrated modular ring steel structure of a reactor building. Background Technology

[0002] The third-generation pressurized water reactor (PWR) nuclear power plant, a world-leading third-generation passive large-scale PWR nuclear power plant with independent intellectual property rights in my country, adheres to advanced nuclear power generation design concepts and features advanced modular construction technology. The reactor's steel containment vessel bottom head is supported by an integrated module of steel structure, reinforcing steel, and piping, serving as a temporary support system for the steel containment vessel bottom head. This module ultimately forms the foundation for the entire reactor building and shielding building after the concrete is poured beneath the steel containment vessel. This integrated module consists of a foundation steel structure support frame, a reinforcing steel support frame, and 6-9 layers of external reinforcing steel and piping. The basic steel structure support frame is circular in shape, assembled from 32 sub-units, with a height of 5.486m, an inner diameter of 21.336m, and an outer diameter of 42.212m. It is a steel structure support frame made of Q355B seamless steel pipes, H-beams, T-beams, steel plates, and other structural steel, with a net weight of 115.8t (including lifting lugs). The external steel frame of the support column weighs 3.9t, the counterweight is 28.02t, and the reinforcing steel for the 6th to 9th floors of the external foundation weighs approximately 152.169t. This is connected and fixed to the basic steel structure support frame via a reinforcing steel support frame weighing approximately 19.5t. The reinforcing steel for each layer is tied to the support frame in an alternating longitudinal and circumferential manner. The construction operation platform and hook-and-unhook chute weigh 7.1t, and the pipe installation weighs 2.758t, for a total weight of 329.247t.

[0003] In traditional construction methods, the assembly and rebar binding of the integrated module are carried out directly on-site. Due to space constraints and the impact of multiple overlapping operations, construction efficiency is low and the construction period is long. Currently, the industry is combining modular construction concepts with the method of assembling the integrated module as a whole in the prefabrication site and then hoisting it to the designated location in the reactor building. This construction method can effectively improve construction efficiency and ensure assembly accuracy. However, due to the characteristics of the integrated module, such as large diameter, heavy weight, and ring-shaped irregular structure, conventional hoisting mechanisms and methods have problems such as uneven force on the slings, easy eccentricity and tilting during module hoisting, difficulty in controlling positioning accuracy, and high hoisting safety risks. These problems cannot meet the high-precision and high-safety hoisting requirements of this ring-shaped steel structure integrated module.

[0004] Therefore, existing technologies need to be improved. Summary of the Invention

[0005] The purpose of this invention is to provide a hoisting mechanism and method for an integrated module of annular steel structure of reactor building. To solve the problems of safety, hoisting levelness and structural stability of the integrated module hoisting, a hoisting sling system, a leveling counterweight system, a stress monitoring system and a hoisting positioning adjustment device are designed for the overall hoisting.

[0006] This invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention also provides an integrated modular hoisting mechanism for the annular steel structure of a reactor building, comprising hoisting equipment, wherein the hoisting equipment is equipped with hoisting cables, the hoisting cables are connected to a main lifting beam, a circular transition beam is provided at the bottom of the main lifting beam, and a main lifting cable is provided on the circular transition beam.

[0008] The top end of the main suspension cable is connected to the circular transition beam, and the bottom end of the main suspension cable is connected to an auxiliary suspension cable. The auxiliary suspension cable includes an outer auxiliary suspension cable connected to the outside of the integrated steel structure module and an inner auxiliary suspension cable connected to the inside of the integrated steel structure module.

[0009] The auxiliary sling is equipped with a stress monitoring and adjustment system, which includes an adjustable tie rod and a strain gauge.

[0010] Furthermore, in this invention, the main lifting beam described above is provided with a horizontal axis, the lifting cable is connected to the horizontal axis, and the top of the circular transition beam is provided with a reinforcing plate connected to the main lifting beam.

[0011] Furthermore, in this invention, the side of the aforementioned circular transition beam is provided with a connecting plate, and the top of the main sling is provided with a hinged lug that is hinged to the connecting plate.

[0012] Furthermore, in this invention, the bottom end of the main sling is connected to a triangular sling distributor, and each of the two bottom corners of the sling distributor is connected to an auxiliary sling.

[0013] Furthermore, in this invention, the main sling is hinged to the top corner of the sling distributor; the auxiliary sling is hinged to the bottom corner of the sling distributor.

[0014] Furthermore, in this invention, a threaded sleeve is provided between the two adjustable rods, and the distance between the two adjustable rods is adjusted by rotating the threaded sleeve.

[0015] Secondly, the present invention also provides a hoisting method, which includes the aforementioned integrated modular hoisting mechanism for the annular steel structure of the reactor building.

[0016] Step 1: Select lifting equipment, use a large crawler crane in normal condition for lifting, test and verify the bearing capacity of the foundation of the lifting route, or carry out necessary reinforcement treatment, and ensure a safe distance from surrounding structures during the lifting process; remove obstacles in the space through which the module is lifted.

[0017] Step 2: Assemble the integrated modular hoisting mechanism for the annular steel structure of the reactor building;

[0018] Step 3: Calculate and analyze the eccentricity of the module using the finite element method. Based on the analysis data, design a leveling and counterweight system for the integrated steel structure module. Set counterweight blocks on the module and adjust the center of gravity by balancing the counterweights to ensure that the integrated steel structure module is balanced as a whole.

[0019] Step 4: First, perform signal testing and calibration using the stress monitoring and adjustment system to ensure normal no-load debugging. Then, check the sling stress. When the hook is lifted to 30% and 100% of the effective weight of the crane, use pre-set strain gauges to check if the stress on the adjustable tie rod meets design requirements. If the stress on any sling is about to exceed the limit, the lifting equipment must be unloaded until the sling is slack, the adjustable tie rod length adjusted, and then the lifting process repeated to check the stress again. Only after all stresses are within limits can the lifting continue.

[0020] Step 5: Raise the integrated steel structure module to the specified elevation, adjust the boom of the lifting equipment, and then move the lifting equipment to the positioning position. Adjust the boom of the lifting equipment again so that the integrated steel structure module is directly above the positioning position. Then slowly lower the hook. When the integrated steel structure module is 0.5m away from the positioning position, the lifting equipment stops lowering the hook and makes fine adjustments. Use a measuring instrument to track and measure the position of the module. Lifting equipment 1 makes correction actions based on the specific position feedback from the measurement, and then achieves docking through the hoisting and positioning adjustment device.

[0021] Furthermore, in this invention, the simulated hoisting and trial hoisting are performed before step 5.

[0022] The simulated hoisting involves performing all the formal hoisting operations according to the actual hoisting process, identifying problems and deficiencies, and making timely corrections and improvements.

[0023] The trial hoisting involves adjusting the horizontality of the lower opening of the module by lowering the sling system to check the safety of the sling system.

[0024] Furthermore, in this invention, the hoisting and positioning adjustment device described above includes a limiting plate, embedded parts, and adjusting shims. After the integrated steel structure module is positioned according to the design position and the load of the hoisting equipment is released, the main sling is in a slack state, and the rebar binding area is unhooked using the unhooking sling rail.

[0025] Furthermore, in this invention, the aforementioned hook-and-unhook rigging slide rail is configured as a steel plate bent into a groove shape, and is fixed to the upper part of the radial and circumferential reinforcing bars using slide rail fixing rods.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] The hoisting mechanism is designed to adapt to the irregular structure of the integrated ring steel structure module. The hoisting force is evenly distributed through the main hoisting beam and the circular transition beam. Combined with the auxiliary slings that are connected at both ends on the outer and inner sides, the stability of the module is ensured during the hoisting process, and the module is prevented from tilting. The triangular sling distributor can evenly distribute the hoisting force of the main sling to the auxiliary slings, further improving the balance of the force on the slings.

[0028] The stress monitoring and adjustment system enables real-time monitoring and precise adjustment of the sling stress. By using strain gauges to detect the sling stress in real time and adjusting the length using adjustable rods, it can promptly correct sling stress exceeding limits, fundamentally preventing sling breakage due to uneven stress and significantly improving the safety of hoisting operations.

[0029] In the hoisting method, finite element analysis is used to adjust the eccentricity and counterweight of the modules, and the center of gravity of the modules is precisely adjusted, which solves the eccentricity problem of heavy ring modules. Simulated hoisting and trial hoisting can identify various problems in advance during the hoisting process, avoid failures during the formal hoisting, and improve the smoothness of the hoisting.

[0030] In summary, the hoisting mechanism and method of this invention are adapted to the hoisting requirements of the integrated ring steel structure module of the third-generation pressurized water reactor nuclear power plant. Compared with the traditional on-site assembly construction method, it significantly improves construction efficiency, shortens the construction cycle, and ensures the overall quality of module assembly and hoisting. It provides reliable technical support for the modular construction of nuclear power plants and has good engineering application value and promotion prospects. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the integrated modular hoisting mechanism for the annular steel structure of the reactor building according to the present invention.

[0033] Figure 2 This is a schematic diagram of the main lifting beam and the circular transition beam of the present invention;

[0034] Figure 3 This is a schematic diagram of the connection between the main sling and the auxiliary sling of the present invention;

[0035] Figure 4 for Figure 3A cross-sectional schematic diagram of AA in the middle;

[0036] Figure 5 This is a schematic diagram of the outer auxiliary sling and the inner auxiliary sling of the present invention;

[0037] Figure 6 A schematic diagram showing the hoisting mechanism of the integrated ring steel structure module of the reactor building passing over the top of the combined module;

[0038] Figure 7 A schematic diagram of the counterweight leveling of the integrated steel structure module;

[0039] Figure 8 This is a schematic diagram of the stress monitoring and adjustment system;

[0040] Figure 9 A schematic diagram of a positioning and limiting adjustment device for an integrated steel structure module;

[0041] Figure 10 This is a schematic diagram of a rigging guide rail;

[0042] Figure 11 for Figure 9 A cross-sectional view of position B in the middle.

[0043] The attached diagram shows the markings and corresponding component names: 1-Lifting equipment, 2-Lifting beam, 2A-Main lifting beam, 2B-Circular transition beam, 3-Main sling, 3A-Sling distributor, 4-Auxiliary sling, 4A-Outer auxiliary sling, 4B-Inner auxiliary sling, 5-Integrated steel structure module, 6-Strain gauge, 8-Limiting plate, 9-Embedded part, 10-Adjusting shim, 11-Unhooking sling slide rail, 12-Radial reinforcement, 13-Circular reinforcement, 14-Slide rail fixing rod, 15-Module counterweight, 16-Adjustable tie rod. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for explanation only and are not intended to limit the invention. The following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0045] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Example 1

[0047] The integrated modular hoisting mechanism for the annular steel structure of the reactor building in this embodiment includes a hoisting device 1, a main hoisting beam 2A, a circular transition beam 2B, a main hoisting sling 3, an auxiliary hoisting sling 4, a stress monitoring and adjustment system, and a hoisting sling distributor 3A. The structural composition of each component is described below.

[0048] Combination Figure 1 As shown, in this embodiment, the lifting equipment 1 can be a QUY800 large crawler crane. The rated lifting capacity of the crane meets the lifting requirements of the 329.247t module, and the crane is in normal condition with all performance indicators passing the test. The lifting cable configured on the crane is a high-strength steel wire rope cable, and the breaking tensile strength meets the lifting safety factor requirements.

[0049] In this embodiment, combined with Figure 1 and Figure 2 As shown, the lifting beam 2 consists of two parts: the main lifting beam 2A and the circular transition beam 2B. The main lifting beam 2A is made of two steel plates, with a solid steel horizontal shaft in the middle. The lifting cable is connected to the horizontal shaft to realize the transmission of lifting force.

[0050] Furthermore, the circular transition beam 2B is made of two circular steel plates and a connecting plate in the middle. The top of the circular transition beam 2B is welded with 6 or 4 thickened steel reinforcing plates. The reinforcing plates are connected to the side of the main lifting beam 2A by welding to enhance the connection strength between the two. The connecting plate is a thick steel plate with hinge holes, which is used to connect the main lifting cable 3.

[0051] Combination Figure 2 and Figure 3 As shown, in this embodiment, the main sling 3 is made of 16 high-strength steel wire ropes, which correspond one-to-one with the 16 connecting plates on the circular transition beam 2B. The top of the main sling 3 is connected to a hinged lug plate, which is hinged to the connecting plate by a pin, so as to realize the adaptive adjustment of the angle of the main sling 3.

[0052] Combination Figure 3As shown, each main sling 3 has a triangular sling distributor 3A hinged to its bottom end. The sling distributor 3A is made of alloy steel and has high structural strength. The top corner of the sling distributor 3A is hinged to the bottom end of the main sling 3, and a secondary sling 4 is hinged to each of the two bottom corners.

[0053] Combination Figure 3 , Figure 4 and Figure 5 As shown, there are a total of 32 auxiliary slings 4, divided into 16 outer auxiliary slings 4A and 16 inner auxiliary slings 4B. The bottom end of the outer auxiliary sling 4A is hinged to the outer lifting point of the steel structure support of the integrated steel structure module 5, and the bottom end of the inner auxiliary sling 4B is hinged to the inner lifting point of the steel structure support of the integrated steel structure module 5, so as to realize the inner and outer double-sided lifting of the integrated steel structure module 5 and ensure the stability of the hoisting.

[0054] Combination Figure 8 As shown, the stress monitoring and adjustment system includes adjustable tie rods 16 and strain gauges 6. Each auxiliary sling 4 has a set of adjustable tie rods 16 connected in series. Each set of adjustable tie rods 16 consists of two externally threaded steel tie rods and an intermediate threaded sleeve. The internal thread of the threaded sleeve matches the external thread of the tie rod. Rotating the threaded sleeve allows for precise adjustment of the distance between the two tie rods. The strain gauges 6 are high-precision foil strain gauges, attached to the middle of the adjustable tie rods 16, used to detect the stress and strain of the adjustable tie rods 16 in real time and transmit the stress signal to the ground monitoring terminal, achieving real-time monitoring of the sling stress.

[0055] After the hoisting mechanism in this embodiment is assembled, the overall rigidity and connection strength are tested. The stress performance of each component is verified by static load test to ensure that all components are firmly connected, under normal stress, and without deformation, loosening or other problems.

[0056] Example 2

[0057] This invention relates to an integrated module of annular concave spherical foundation steel structure, reinforcing steel, and piping for a third-generation pressurized water reactor nuclear power plant reactor building. The integrated module consists of annular concave spherical foundation steel structure support frame and 6-9 layers of reinforcing steel and piping on the external foundation. Its outer diameter is 42.212m, inner diameter is 21.336m, height is 5.486m, and the integrated module weighs 329.247t.

[0058] This embodiment provides a method for hoisting an integrated annular steel structure module of a reactor building. The hoisting mechanism of Embodiment 1 is used to hoist the integrated annular steel structure module of a third-generation pressurized water reactor nuclear power plant. The specific steps are as follows:

[0059] 1. Preparations before hoisting

[0060] A QUY800 crawler crane was selected as the lifting equipment 1. Bearing capacity tests were conducted on the foundation of the crane's lifting route and station area. If the bearing capacity was lower than the design requirements, the area was reinforced by replacing the foundation with graded sand and gravel and laying steel plates. After reinforcement, the bearing capacity of the foundation met the lifting requirements. The crane's travel and lifting routes were planned to ensure that the safe distance between the crane and the surrounding reactor building foundation, construction equipment and other structures was not less than 5m. All obstacles in the space from the prefabrication site to the installation position of the module were removed to ensure unobstructed lifting space.

[0061] 2. Assembly of the hoisting mechanism

[0062] like Figure 6 As shown, in the designated area of ​​the prefabrication site, assemble the main lifting beam 2A, circular transition beam 2B, main lifting cable 3, lifting cable distributor 3A, auxiliary lifting cable 4, and stress monitoring and adjustment system sequentially according to design requirements. After assembly, check the tightness and test the signal transmission of the stress monitoring and adjustment system to ensure it is functioning correctly.

[0063] 3. Module eccentricity leveling and counterweight

[0064] Combination Figure 7 As shown, the integrated steel structure module 5 was modeled using ANSYS finite element analysis software. The weight distribution and eccentricity of the module were calculated and analyzed. The analysis results showed that the module had a certain amount of eccentricity due to uneven distribution of the reinforcing bars. Based on the analysis data, a counterweight 15 was set at the corresponding position of the module. By setting the counterweight 15, the center of gravity of the integrated steel structure module 5 was adjusted so that the center of gravity of the integrated steel structure module 5 coincided with the geometric center, and the whole reached a state of equilibrium.

[0065] 4. Stress monitoring and sling load adjustment

[0066] First, start the stress monitoring and adjustment system to perform signal testing and calibration. Input a standard strain signal into strain gauge 6. The ground monitoring terminal can accurately receive and display the signal, indicating that the system is working properly under no-load conditions. Then, control the lifting equipment 1 to slowly lift the hook and check the stress on the sling.

[0067] When the hook was lifted to 30% of the effective weight of the crane (approximately 98.77t), the lifting was paused. The strain gauge 6 was used to check the stress on all adjustable tie rods 16. It was found that the stress on the adjustable tie rods 16 of the three inner auxiliary slings 4B was slightly high, close to the design limit. The crane was immediately unloaded to the sling slack state, and the length of the adjustable tie rods 16 was adjusted. After the adjustment, the hook was lifted again to 30% of the effective weight. The test showed that the stress on all slings was within the design range.

[0068] Continue lifting the hook until the crane can bear 100% of its effective weight (329.247t). Check the sling tension again. It was found that the adjustable tie rod 16 of one outer auxiliary sling 4A was close to the limit. Repeat the above unloading, adjustment and testing steps to lengthen the adjustable tie rod 16. All sling tensions met the design requirements, and the sling tension adjustment was completed.

[0069] 5. Simulated hoisting and trial hoisting

[0070] Simulated hoisting: Control the hoisting equipment 1 according to the complete process of formal hoisting, simulate all operation actions such as module lifting, boom adjustment, crane movement, hook lowering, and positioning adjustment. During the simulation, it was found that when the crane moved to a certain position, there was a slight spatial interference between the boom and the temporary construction protection frame. The protection frame was immediately dismantled and moved. At the same time, it was found that the pin connection of some slings was slightly loose. It was tightened in time, and the problem was corrected.

[0071] Trial lifting: Control the lifting equipment 1 to slowly lift the module, so that the lower part of the module is a certain distance away from the prefabricated platform. Adjust the level of the lower part of the module by adjusting the adjustable tie rods 16 of each auxiliary sling 4. Use a level to check the horizontal deviation of the lower part of the module and adjust it until the horizontal deviation is not significant. Then, conduct a comprehensive inspection of all connection parts of the sling system, strain gauges 6, adjustable tie rods 16 and other components to confirm that there are no loose, damaged or abnormal signal problems. The trial lifting is qualified.

[0072] 6. Formal hoisting and high-precision positioning

[0073] The crane is controlled to slowly lift the integrated steel structure module 5 to the design elevation of 10m. Then, the crane is controlled to slowly move along the planned route to the module's designated position in the reactor building. The boom's elevation and slewing angles are finely adjusted again to ensure the integrated steel structure module 5 is precisely aligned above the designated position. The crane is then slowly lowered. When the module is 0.5m from the designated position, the lowering is stopped. A total station or level is used to track and measure the module's spatial position in real time. The measuring instrument transmits the position data to the crane's operating terminal in real time. The operator uses the feedback data to correct the crane boom and adjust the module's planar position and level. Finally, the module is connected using the hoisting and positioning adjustment device.

[0074] like Figure 9 As shown, the assisted leveling is achieved through a hoisting and positioning adjustment device. The embedded part 9 has been pre-cast on the positioning foundation of the reactor building. The limiting plate 8 is welded to the embedded part 9 to limit the horizontal displacement of the module. Adjusting shims 10 are laid between the bottom of the module and the foundation. By increasing or decreasing the thickness of the adjusting shims 10, the elevation and level of the module are finely adjusted so that the planar position deviation and level deviation of the module meet the expectations, thus achieving precise docking between the module and the positioning position.

[0075] 7. Unloading and unhooking

[0076] Combination Figure 10 and Figure 11 After the module is precisely positioned, the lifting equipment 1 is controlled to gradually and slowly release the load. During the load release process, the position of the module is continuously monitored to ensure that the module does not shift. After the load is completely released, the main sling 3 is in a naturally relaxed state. In the area where the module is tied with reinforcing bars, the unhooking operation is carried out using the pre-fixed unhooking sling slide rail 11: the unhooking sling slide rail 11 is made of 3mm thick steel plate bent into a 200*400*200mm groove shape, and is fixed to the upper part of the radial reinforcing bar 12 and the circumferential reinforcing bar 13 using steel slide rail fixing rods 14. The groove-shaped slide rail guides the unhooking sling to move along the top of the reinforcing bar to avoid the sling from getting tangled with the reinforcing bar. The operator removes the pins of the auxiliary sling 4 and the module lifting point one by one through the slide rail, completing the unhooking operation of all slings, and the entire lifting process is completed.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A modular hoisting mechanism for annular steel structure of a reactor building, characterized in that, The device includes a lifting device (1), which is equipped with a lifting cable. The lifting cable is connected to a main lifting beam (2A). A circular transition beam (2B) is provided at the bottom of the main lifting beam (2A), and a main lifting cable (3) is provided on the circular transition beam (2B). The top end of the main sling (3) is connected to the circular transition beam (2B), and the bottom end of the main sling (3) is connected to the auxiliary sling (4). The auxiliary sling (4) includes an outer auxiliary sling (4A) connected to the outside of the integrated steel structure module (5) and an inner auxiliary sling (4B) connected to the inside of the integrated steel structure module (5). The auxiliary sling (4) is equipped with a stress monitoring and adjustment system, which includes an adjustable tie rod (16) and a strain gauge (6).

2. The integrated modular hoisting mechanism for the annular steel structure of the reactor building according to claim 1, characterized in that, The main lifting beam (2A) is provided with a horizontal axis, the lifting cable is connected to the horizontal axis, and the top of the circular transition beam (2B) is provided with a reinforcing plate connected to the main lifting beam (2A).

3. The integrated modular hoisting mechanism for the annular steel structure of the reactor building according to claim 2, characterized in that, The circular transition beam (2B) is provided with a connecting plate on its side, and the top of the main sling (3) is provided with a hinged ear plate that is hinged to the connecting plate.

4. The integrated modular hoisting mechanism for the annular steel structure of the reactor building according to claim 1, characterized in that, The bottom end of the main sling (3) is connected to a triangular sling distributor (3A), and the two bottom corners of the sling distributor (3A) are respectively connected to a secondary sling (4).

5. The integrated modular hoisting mechanism for the annular steel structure of the reactor building according to claim 4, characterized in that, The main sling (3) is hinged to the top corner of the sling distributor (3A); the auxiliary sling (4) is hinged to the bottom corner of the sling distributor (3A).

6. The integrated modular hoisting mechanism for the annular steel structure of the reactor building according to claim 1, characterized in that, A threaded sleeve is provided between the two adjustable rods (16), and the distance between the two adjustable rods (16) is adjusted by rotating the threaded sleeve.

7. A hoisting method, characterized in that, Includes the integrated modular hoisting mechanism for the annular steel structure of the reactor building as described in any one of claims 1-6. Step 1: Select lifting equipment (1), use a large crawler crane in normal condition to lift, test and verify the bearing capacity of the foundation of the lifting route, or carry out necessary reinforcement treatment, and ensure a safe distance between the lifting process and the surrounding structures; remove obstacles in the space through which the module is lifted; Step 2: Assemble the integrated module of the annular steel structure of the reactor building (5) hoisting mechanism; Step 3: Calculate and analyze the eccentricity of the module using the finite element method. Based on the analysis data, design a leveling and counterweight system for the integrated steel structure module (5). Set counterweight blocks on the module and adjust the center of gravity by balancing the counterweights to ensure that the integrated steel structure module (5) is balanced as a whole. Step 4: First, perform signal testing and calibration through the stress monitoring and adjustment system to ensure normal no-load debugging. Then, check the sling stress. When the hook is lifted to 30% and 100% of the effective weight of the crane, use the pre-set strain gauge (6) to check whether the stress of the adjustable tie rod (16) meets the design requirements. If the stress of a sling is about to exceed the limit, the lifting equipment (1) needs to be unloaded to the sling slack state, the length of the adjustable tie rod (16) is adjusted, and then the lifting is carried out again to check the stress until the stress does not exceed the limit. Only then can the lifting continue. Step 5: Lift the integrated steel structure module (5) to the specified elevation, adjust the boom of the lifting equipment (1), then move the lifting equipment (1) to the positioning position, and then adjust the boom of the lifting equipment (1) so that the integrated steel structure module (5) is directly above the positioning position. Then slowly lower the hook. When the integrated steel structure module (5) is 0.5m away from the positioning position, the lifting equipment (1) stops lowering the hook and makes detailed adjustments. Use a measuring instrument to track the module position. The lifting equipment 1 implements correction actions according to the specific position feedback from the measurement, and then achieves docking through the hoisting positioning adjustment device.

8. The hoisting method according to claim 7, characterized in that, Before step 5, a simulated hoisting and trial hoisting should be performed. The simulated hoisting involves using lifting equipment (1) to perform all formal hoisting operations according to the formal hoisting process, identifying problems and deficiencies, and promptly correcting and improving them. The trial hoisting involves adjusting the horizontality of the lower opening of the module by lowering the sling system to check the safety of the sling system.

9. The hoisting method according to claim 8, characterized in that, The hoisting and positioning adjustment device includes a limiting plate (8), an embedded part (9), and an adjusting pad (10). After the steel structure integrated module (5) is positioned according to the design position, the main sling (3) is in a relaxed state after the load of the hoisting equipment (1) is released. The rebar binding area is unhooked using the unhooking sling rail (11).

10. The hoisting method according to claim 9, characterized in that, The hook-and-unhook rigging slide rail (11) is configured as a steel plate bent into a groove shape, and is fixed to the upper part of the radial reinforcing bar (12) and the circumferential reinforcing bar (13) by a slide rail fixing rod (14).

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