A modular hoisting system for nuclear power plants

Abstract

This utility model discloses a modular hoisting system for nuclear power plants, comprising: a hook and a sling assembly. The top of the hook is connected to a crane, and the bottom of the hook is connected to the sling assembly. The bottom of the sling assembly is detachably connected to the module to be hoisted. This utility model can improve the construction efficiency of nuclear power plants, effectively shorten the construction period, and reduce the impact of multiple hoisting and lowering operations on the construction progress and safety of other unit projects.

Description

Technical Field

[0001] This utility model relates to the field of large component hoisting technology in nuclear power plants, and in particular to a modular hoisting system for nuclear power plants. Background Technology

[0002] After 2020, guided by the "dual carbon" goals, nuclear power has accelerated its recovery, and its role in clean energy and low-carbon systems will become clearer and more prominent. Currently, nuclear power unit construction tends to adopt modular construction and the introduction of open-top hoisting methods for main nuclear power equipment, which can better ensure construction schedule and quality. However, while large-scale modularization and open-top hoisting provide various conveniences, they also increase construction difficulty; the large size of some equipment brings significant risks and challenges to hoisting work.

[0003] Currently, nuclear power plant construction companies have gradually adopted fully modular construction technology. In order to keep up with the implementation of new nuclear power plant processes, research into modular hoisting technology is imperative. Utility Model Content

[0004] The main purpose of this utility model is to propose a modular hoisting system for nuclear power plants, which aims to improve the construction efficiency of nuclear power plants, effectively shorten the construction period of nuclear power plants, and at the same time reduce the impact of multiple hoisting and lowering operations on the construction progress and safety of other unit projects.

[0005] To achieve the above objectives, this utility model provides a modular hoisting system for nuclear power plants, comprising: a hook and a sling assembly, wherein the top of the hook is connected to a crane, the bottom of the hook is connected to the sling assembly, and the bottom of the sling assembly is detachably connected to the module to be hoisted.

[0006] A further technical solution of this utility model is that the module to be hoisted is a structural module, and the hoisting sling assembly includes: a primary connector, a primary balance beam, a secondary connector, a secondary balance beam, a tertiary connector, a first and third level balance beam, a second and third level balance beam, and a hoisting sling connected from top to bottom. The primary connector is connected to the hook, and the hoisting sling is connected to the structural module.

[0007] A further technical solution of this utility model is that the sling assembly further includes a leveling counterweight frame and a leveling counterweight disposed within the leveling counterweight frame, the leveling counterweight frame being disposed on the structural module.

[0008] A further technical solution of this utility model is that the module to be hoisted is a steel safety shell, and the sling assembly includes: an adapter, a distributor, several wire rope slings and an adjustable rod connected in sequence from top to bottom. The adjustable rod is located at the end of the wire rope slings and is used to connect the steel safety shell.

[0009] A further technical solution of this utility model is that a strain gauge is provided at the connection between the adjustable tie rod and the steel safety shell.

[0010] A further technical solution of this utility model is that the strain gauge includes a sensitive grid, an insulating substrate, a protective layer, and an elastomer.

[0011] The beneficial effects of this modular hoisting system for nuclear power plants are:

[0012] This utility model, through the above-mentioned technical solution, includes: a hook and a sling assembly. The top of the hook is connected to a connecting crane, and the bottom of the hook is connected to the sling assembly. The bottom of the sling assembly is detachably connected to the module to be lifted. A large crawler crane is used as the lifting machinery. The large crawler crane's onboard computer, torque sensor, tension sensor, and other safety systems monitor the entire lifting process, which is beneficial for precise control of the lifting process. The slings are designed according to the structural modules, and precise control can be achieved based on the center of the slings and the center of gravity of the structural modules. Based on the analysis and calculation of the structure, appropriate leveling counterweights are added, and based on the scanning modeling analysis of the foundation of the structural modules, issues such as reinforcing bars that may interfere with the equipment foundation are addressed in advance. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a structural schematic diagram of one embodiment of the modular hoisting system for nuclear power plants of this utility model;

[0015] Figure 2 This is a structural schematic diagram from another angle of one implementation scheme of the modular hoisting system for nuclear power plants of this utility model;

[0016] Figure 3 This is a structural schematic diagram of another embodiment of the modular hoisting system for nuclear power plants of this utility model;

[0017] Figure 4 This is a structural schematic diagram from another angle of another implementation scheme of the modular hoisting system for nuclear power plants of this utility model;

[0018] Figure 5 This is a schematic diagram of the strain gauge installation location;

[0019] Figure 6This is a schematic diagram of a coordinate system established with the center of the hook as the origin.

[0020] Explanation of icon numbers:

[0021] 1. Hook; 2. Primary connector; 3. Primary balance beam; 4. Secondary connector; 5. Secondary balance beam; 6. Tertiary connector; 7. First and third level balance beams; 8. Lifting sling; 9. Second and third level balance beams; 10. Structural module; 11. Adapter; 12. Distributor; 13. Wire rope sling; 14. Adjustable tie rod; 15. Steel safety shell; 16. Strain gauge.

[0022] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0025] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0026] This utility model proposes a modular hoisting system for nuclear power plants, such as... Figures 1 to 4As shown, a preferred embodiment of the modular hoisting system for nuclear power plants of this utility model includes: a hook 1 and a sling assembly. The top of the hook 1 is connected to a crane, the bottom of the hook 1 is connected to the sling assembly, and the bottom of the sling assembly is detachably connected to the module to be hoisted.

[0027] As one implementation scheme, in this embodiment, the module to be hoisted is structural module 10, and the hoisting sling assembly includes: a primary connector 2, a primary balance beam 3, a secondary connector 4, a secondary balance beam 5, a tertiary connector 6, a first and third level balance beam 7, a second and third level balance beam 9, and a hoisting sling 8 connected sequentially from top to bottom. The primary connector 2 is connected to the hook, and the hoisting sling 8 is connected to the structural module 10.

[0028] In this embodiment, the sling assembly further includes a leveling counterweight frame and a leveling counterweight disposed within the leveling counterweight frame, wherein the leveling counterweight frame is disposed on the structural module 10.

[0029] In another implementation, in this embodiment, the module to be hoisted is a steel safety shell 15, and the sling assembly includes, from top to bottom, an adapter 11, a distributor 12, several wire rope slings 13 and an adjustable rod 14, which are connected in sequence. The adjustable rod 14 is located at the end of the wire rope slings 13 and is used to connect the steel safety shell 15.

[0030] Furthermore, a strain gauge 16 is provided at the connection between the adjustable tie rod 14 and the steel safety shell 15.

[0031] Furthermore, the strain gauge 16 includes a sensitive grid, an insulating substrate, a protective layer, and an elastomer.

[0032] The structure and working principle of the modular hoisting system for nuclear power plants of this utility model will be further explained below.

[0033] In the construction of the CAP1000 nuclear power plant, the steel containment vessel 15, spent fuel storage, transmission, and heat exchange structures, steam generator compartments, and refueling channel modules all utilize an on-site, integrated hoisting process. To achieve modular hoisting, a large crawler crane is typically used to lift large equipment from two reactor buildings and surrounding structures. Therefore, this invention proposes a modular hoisting system for nuclear power plants. When using this modular hoisting system, the large structural modules 10 of the nuclear power plant are hoisted into place in a single operation through several steps, including 3D laser scanning, simulated collision detection, center of gravity modeling analysis, and sand table simulation studies.

[0034] In particular, when the three-dimensional laser scanning is carried out simultaneously with the structural module 10 and the civil engineering foundation, the parts that may interfere are processed in advance to avoid working under the suspended object after the structural module 10 is lifted.

[0035] Simulated collision detection involves performing the lifting, slewing, and luffing actions of a large crawler crane before module lifting, according to the lifting plan, after the large crawler crane enters the planned lifting area. This allows for the prediction of potential interference points and the development of solutions.

[0036] Structural module 10 is assembled from multiple different modules, and its center of gravity deviates from that of the lifting slings. The overall lifting of structural module 10 requires a high degree of horizontality. In this invention, the center of gravity of structural module 10 and the lifting slings is first analyzed and calculated using a center-of-gravity model. A leveling counterweight frame and leveling counterweights are then used to level the structural module 10, ensuring it meets the horizontality requirements for module lifting.

[0037] The sand table simulation study simulates the entire module hoisting process, from 3D laser scanning to module hoisting and placement, breaks down the potential risks in each step, and develops contingency plans in advance to effectively control the entire hoisting process.

[0038] When using the modular hoisting system for nuclear power plants according to this utility model, a large crawler crane is used, combined with modeling calculations and monitoring methods, to achieve precise placement of the large structural module 10 of the nuclear power plant. The modeling calculations include 3D scanning of the bottom steel profile of the module and the installation foundation, leveling calculations related to the structural module 10, stress calculations of the leveling counterweight frame, and the distance between the module and the crane arm at a certain height. The monitoring methods include monitoring the distance between the top of the structural module 10 and the top of the crane arm using the onboard computer of the large crawler crane, and detecting the tension on the left and right pull plates of the large crawler crane. Furthermore, when hoisting the steel containment vessel 15 module, strain gauges 16 are attached to the sling connections to help adjust the length of each sling of the steel containment vessel 15 module, ensuring uniform stress at each hoisting point. Stress changes during the hoisting process are monitored in real time.

[0039] The steps for using this modular hoisting system for nuclear power plants are as follows:

[0040] a. Conduct scanning and modeling of the foundation for the installation of structural module 10, identify potential interference locations during the hoisting and placement of structural module 10, and handle them as required. After the handling is completed, pass the acceptance test.

[0041] b. Select the appropriate lifting equipment based on the module being lifted.

[0042] Transport structural module 10 to the hoisting site.

[0043] c. Connect the slings to the structural module 10. (If hoisting a steel safety shell 15, after completing the sling connection, attach strain gauges 16 to the 16 lifting points to monitor the strain and stress at multiple lifting points and adjust the length of each sling.)

[0044] d. Based on the calculation results of the scheme, use the leveling counterweight frame and leveling counterweight to level the structural module 10.

[0045] e. During equipment hoisting, the distance between the top of the on-board gantry computer monitoring module 10 and the top of the crane boom, and the tension on the left and right pull plates of the large crawler crane are detected.

[0046] f. Equipment hoisting and positioning.

[0047] The modular hoisting system for nuclear power plants described in this utility model is accomplished using a large crawler crane. First, the foundation for the structural module 10 is scanned and modeled to identify potential interference points during hoisting. These points are then addressed as required, followed by acceptance testing. The appropriate lifting equipment is selected based on the module being hoisted, and the structural module 10 is transported to the hoisting site. The slings are then connected to the structural module 10 (if hoisting a steel containment vessel 15, strain gauges 16 are attached to the 16 hoisting points after sling connection to monitor strain and stress at multiple points and adjust the length of each sling). Based on the calculations, a leveling counterweight frame and leveling counterweights are used to level the structural module 10. During equipment hoisting, the onboard computer of the large crawler crane monitors the distance between the top of the structural module 10 and the top of the crane boom, and detects the tension on the left and right pull plates of the large crawler crane. The main equipment and tools used in this invention include a large crawler crane (with tension sensor and torque sensor), corresponding lifting slings for the modules, a leveling counterweight frame, a leveling counterweight, and a dynamic and static strain testing system. The large crawler crane is the main lifting equipment for the nuclear power plant structural module 10. The corresponding lifting slings are manufactured according to the characteristics of the structural module 10 being lifted. Figures 1 to 4 As shown. The leveling counterweight frame and leveling counterweight are used for leveling the structural module 10. The tension sensor and torque sensor are factory-installed safety devices for large crawler cranes, used to monitor the lifting equipment and structural module 10 during the lifting process. The dynamic and static strain testing system uses strain gauges 16 attached to the lifting points to monitor the stress changes of the steel safety shell 15 in real time during the lifting process, issuing an alarm before exceeding the specified limits to prevent the steel safety shell 15 from cracking or being damaged by pressure due to excessive stress.

[0048] As a feature of this invention, the use of corresponding lifting slings instead of traditional lifting slings facilitates the leveling of the structural module 10 and improves the horizontality of the structural module 10 during the hoisting process.

[0049] The following explanation uses the hoisting of CA20 structural module 10 in the CAP1000 nuclear power plant as an example.

[0050] The CA20 structural module 10 has a net weight of 900t and external dimensions of 20.6m × 14.2m × 21m.

[0051] First, the bottom steel of the module is modeled according to the module design drawing. Then, the foundation is scanned and modeled for analysis and calculation. The parts that may cause interference are analyzed and processed in advance.

[0052] Assemble the sling assembly: According to the design drawings, assemble the slings in the following order: primary balance beam 3 → secondary balance beam 5 → tertiary balance beam → ring lifting belt 8.

[0053] Connecting the slings to the structural module 10: Operate a large crawler crane to align the slings with the lifting points of the structural module 10 to complete the connection of the slings.

[0054] Monitoring system installation and deployment: such as Figure 5 As shown, if the hoisting structure module 10 is a steel containment shell 15, a thin-film strain gauge 16 is attached to the hoisting point. The thin-film strain gauge 16 consists of a sensitive grid, an insulating substrate, a protective layer, and an elastomer. Then, a stress monitoring system is connected to it.

[0055] Structural module 10 hoisting: The distance between the top of structural module 10 and the top of the crane boom is monitored by the on-board computer of the large crawler crane, and the tension on the left and right pull plates of the large crawler crane is detected.

[0056] Module leveling calculation:

[0057] The CA20 module is hoisted using a single hook 1 mode. The combined center of gravity of the module and the slings is located at the center of hook 1. The plane coordinates of the center of hook 1 are (997.023, 1001.156). The positive X-axis is north of the power plant coordinate system, and the positive Y-axis is west of the power plant coordinate system.

[0058] With the center of hook 1 as the origin of the coordinate system, according to Figure 6 Establish a coordinate system and calculate the module's center of gravity according to the theoretical center of gravity coordinates. The center of gravity of the module is located in the fourth quadrant. Set the counterweight frame at the position shown in the figure below for module leveling. Setting the counterweight frame in this way can avoid interference with the cylinder.

[0059] The CA20 module weighs approximately 900t before hoisting (excluding leveling counterweights), and the lifting slings weigh 100.8t. Therefore, the total weight of the lifting slings and module is G = 1000.8t. According to the principle of torque balance,

[0060] Theoretically, the amount of counterweight (including the weight of the counterweight frame) that should be added to counterweight frame 1 is:

[0061] P1x1=Gx

[0062] P1=Gx÷x1=(1000.8t×126)÷8153=15t

[0063] Theoretically, the amount of counterweight (including the weight of the counterweight frame) that should be added to counterweight frame 2 is:

[0064] P1y1+P2y2=Gy

[0065] P2=(Gy-P1y1)÷y2=(1000.8×57-15×0)÷10280=5.5t

[0066] Because the connection points of the lifting equipment are not asymmetrically arranged, the lifting equipment is tilted before the modules are connected after installation. This design reduces the stacking pressure of the counterweights during leveling and avoids irreversible deformation of the modules caused by excessive leveling counterweights.

[0067] This invention relates to a modular hoisting technology for nuclear power plants based on the CAP1000 nuclear power plant modular hoisting system. It involves scanning and modeling analysis of the bottom steel sections of the module and the foundation for module placement, pre-emptively addressing potential interference points on-site, selecting appropriate slings, and through analysis and calculation, using leveling counterweights and leveling counterweight frames to ensure the tilt angle of the structural module 10 is within the hoisting range. Advanced large crawler cranes equipped with tension sensors, torque sensors, and stress monitoring systems ensure that the deformation of the structural module 10 remains within permissible limits during hoisting, preventing cracking, pressure damage, and other injuries.

[0068] This invention enables the maximum installation of modules to reduce the workload of the nuclear island, reduces the risk of overlapping high-altitude operations, improves construction efficiency, and shortens the overall construction period, creating favorable conditions for the main nuclear island work in terms of both time and space.

[0069] In summary, this utility model, based on the modular hoisting of the CAP1000 nuclear power plant, provides a modular hoisting technology for nuclear power plants that enables the general process flow of modular hoisting of nuclear power plants.

[0070] The beneficial effects of this modular hoisting system for nuclear power plants are:

[0071] This utility model, through the above-mentioned technical solution, includes: a hook and a sling assembly. The top of the hook is connected to a connecting crane, and the bottom of the hook is connected to the sling assembly. The bottom of the sling assembly is detachably connected to the module to be lifted. A large crawler crane is used as the lifting machinery. The large crawler crane's onboard computer, torque sensor, tension sensor, and other safety systems monitor the entire lifting process, which is beneficial for precise control of the lifting process. The slings are designed according to the structural modules, and precise control can be achieved based on the center of the slings and the center of gravity of the structural modules. Based on the analysis and calculation of the structure, appropriate leveling counterweights are added, and based on the scanning modeling analysis of the foundation of the structural modules, issues such as reinforcing bars that may interfere with the equipment foundation are addressed in advance.

[0072] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A modularized hoisting system for a nuclear power plant, characterized in that, include: A hook and a sling assembly, wherein the top of the hook is connected to a crane, the bottom of the hook is connected to the sling assembly, and the bottom of the sling assembly is detachably connected to the module to be lifted; The module to be hoisted is a structural module. The hoisting sling assembly includes, from top to bottom, a primary connector, a primary balance beam, a secondary connector, a secondary balance beam, a tertiary connector, a first and third level balance beam, a second and third level balance beam, and a hoisting sling. The primary connector is connected to the hook, and the hoisting sling is connected to the structural module.

2. The modular hoisting system for nuclear power plants according to claim 1, characterized in that, The sling assembly also includes a leveling counterweight frame and a leveling counterweight disposed within the leveling counterweight frame, the leveling counterweight frame being disposed on the structural module.

3. The modular hoisting system for nuclear power plants according to claim 2, characterized in that, The module to be hoisted is a steel safety shell. The sling assembly includes, from top to bottom, an adapter, a distributor, several wire rope slings, and an adjustable tie rod. The adjustable tie rod is located at the end of the wire rope slings and is used to connect the steel safety shell.

4. The modular hoisting system for nuclear power plants according to claim 3, characterized in that, Strain gauges are provided at the connection between the adjustable tie rod and the steel containment structure.

5. The modular hoisting system for nuclear power plants according to claim 4, characterized in that, The strain gauge includes a sensitive grid, an insulating substrate, a protective layer, and an elastomer.

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