Method for installing a ring hoist

Abstract

The present application relates to the technical field of nuclear power large hoisting technology, and particularly relates to a mounting method of ring hoisting equipment. The mounting method of the ring hoisting equipment comprises the following steps: S1, completing pouring of four reinforced concrete buttresses and detection of bearing capacity thereof; S2, arranging a raft and a cushion frame on the four reinforced concrete buttresses; S3, completing overall assembly of the ring hoisting equipment on the four reinforced concrete buttresses, and after completion of the assembly, carrying out electrical wiring, line checking, electrical performance testing and simulation test operation on the ring hoisting equipment; S4, mounting two groups of lifting lug groups with different hoisting centers on the ring hoisting trolley; S5, simultaneously connecting all the lifting lugs by using lifting ropes, and hoisting the ring hoisting equipment into position by using a crane. The mounting method can greatly shorten the hoisting period and reduce the time of occupying the nuclear island site; by optimizing the number and position of the lifting lugs, the total lifting capacity of the lifting appliance can meet the overall hoisting demand, and the hoisting precision is improved.

Description

Technical Field

[0001] This invention relates to the field of large-scale hoisting technology in nuclear power plants, and in particular to a method for installing a ring hoisting device. Background Technology

[0002] As the core equipment for lifting large and heavy nuclear equipment and key components, the installation quality and efficiency of the ring crane directly affect the overall progress and safety stability of nuclear power plant construction.

[0003] Traditional ring crane installations often employ a split-lifting method, which has the following drawbacks: it fails to fully utilize the crane's lifting capacity; electrical wiring, debugging, and other work require a long time to occupy the large-component lifting area; the workload at heights is large; the support frame cannot provide reliable support for the installation of the ring crane's bottom platform; the selection of slings lacks versatility; and the lifting safety and precision control are relatively low. Summary of the Invention

[0004] The purpose of this invention is to provide an efficient, precise, and safe method for installing ring crane equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A method for installing a ring-lifting device includes the following steps: S1. Complete the pouring of four reinforced concrete piers and test their bearing capacity; S2. Complete the reinforcement binding and concrete pouring of the raft slab on four reinforced concrete piers. After the curing period, conduct a bearing capacity test. Make 12 sets of reinforced concrete pads and place them on the raft slab. After the arrangement is completed, level the pads and set settlement observation points on them. S3. Complete the overall assembly of the ring crane equipment on four reinforced concrete supports. After the assembly is completed, carry out electrical wiring, line verification, electrical performance testing and simulation test of the ring crane equipment. S4. Install multiple first lifting lugs and multiple second lifting lugs on the ring crane trolley in the ring crane equipment. The lifting center of the multiple first lifting lugs coincides with the lifting center of the ring crane equipment, and the lifting center of the multiple second lifting lugs coincides with the lifting center of the ring crane trolley. S5. Use slings to connect all the first lifting lugs and all the second lifting lugs at the same time, and use a crane to lift the ring hoisting equipment into place as a whole.

[0006] In some embodiments, in step S1, a sandy soil site that has not been excavated for a long time is selected, and after the site is compacted by a road roller, four reinforced concrete supports are poured on the site.

[0007] In some embodiments, the method for conducting a bearing capacity test on the raft slab in step S2 is as follows: a 40t load is applied to the raft slab, and its settlement is observed after holding the load for 10 minutes to ensure that the foundation pressure is ≤0.46MPa.

[0008] In some embodiments, in step S3, the installation sequence of the components within the hoisting equipment is as follows: hoisting trolley, driver's cab, driver's cab platform, boarding and emergency vehicle platform, guardrail, hoisting trolley, main lifting mechanism, auxiliary lifting mechanism, and cable carriage.

[0009] In some embodiments, step S5 specifically includes: Place a counterweight on the top of the non-electric beam of the hoisting equipment, and fix sleepers and rubber sheets on the lifting lugs or wedges to complete the leveling preparation; All first lifting lugs and all second lifting lugs are connected simultaneously using slings, and the slings are then connected to the gantry crane. Start the gantry crane and slowly lift the ring-lifting equipment; When the hoisting equipment is raised to a height of 100mm, pause and check. After confirming that there are no problems, continue raising. When the gantry crane is raised to the predetermined height, the running trajectory of the gantry crane is adjusted, and the gantry crane is transferred to the top of the nuclear island and slowly lowered into place.

[0010] In some embodiments, in step S5: When the hoisting equipment is lowered to a height of 2m, adjust its center position. When the hoisting equipment is lowered to 1m, adjust the azimuth angle so that the support column at the bottom of the hoisting equipment is aligned with the guide device; When the hoisting equipment descends to 0.24m, check whether the force on each sling is uniform. After confirming that there is no problem, slowly move it into the positioning position.

[0011] In some embodiments, when the hoisting equipment is in the hoisting state, the angle between each sling and the horizontal plane in the front view is greater than or equal to 50°, and the angle between the sling connected to the first lifting lug and the horizontal plane in the side view is less than or equal to 5°; the overall rated load capacity of the slings is ≥680t.

[0012] In some embodiments, in step S5, a balance beam is used for hoisting; the balance beam includes a beam body, shackles, tie plates, adapters, and beam joints. The beam body is composed of at least two beam segments spliced ​​together. The number of beam segments and the length of each beam segment are adjusted according to the needs of different hoisting equipment. A beam joint is provided at each end of the beam body. Each beam joint is hinged to a tie plate by a pin. A plurality of shackles are provided at the bottom of each tie plate. The two ends of the beam body are used to connect to the crane, and the shackles are used to suspend the slings.

[0013] In some embodiments, the installation method of the ring hoisting equipment further includes the following steps: S6. If the installation parameters of the ring hoisting equipment do not meet the requirements after it is in place, a synchronous jacking system is used for adjustment. The synchronous jacking system includes multiple adjustment fulcrums arranged on the ring hoisting beam platform within the nuclear island. Each adjustment fulcrum is equipped with two hydraulic cylinders arranged in parallel. The piston rods of the hydraulic cylinders can abut against the bottom of the ring hoisting equipment. The extension and retraction strokes of each hydraulic cylinder are adjusted according to the installation parameters of the ring hoisting equipment to ensure that the various installation parameters of the ring hoisting equipment meet the requirements. Then, the ring hoisting equipment is fixed by shims and connecting bolts.

[0014] In some embodiments, the installation method of the ring hoisting equipment further includes the following steps: S7. After the installation of the ring crane equipment is completed, a load test is conducted. After the load test is passed, the temporary facilities are removed and the installation is completed.

[0015] The beneficial effects of this invention are: The installation method of the ring crane equipment provided by the present invention includes the following steps: S1, completing the pouring of four reinforced concrete supports and testing their bearing capacity; S2, arranging rafts and pads on the four reinforced concrete supports; S3, completing the overall assembly of the ring crane equipment on the four reinforced concrete supports, and after the assembly is completed, carrying out electrical wiring, line verification, electrical performance testing and simulation test operations on the ring crane equipment; S4, installing two sets of lifting lugs with different lifting centers on the ring crane trolley; S5, connecting all lifting lugs simultaneously with slings, and lifting the ring crane equipment into place as a whole by a crane.

[0016] The beneficial effects of the installation method of the ring hoisting equipment are: (1) By completing the mechanical assembly and most of the electrical debugging of the ring hoisting equipment (including the ring hoisting trolley and the ring hoisting trolley) on the ground, and then accurately hoisting it into place, the hoisting cycle can be greatly shortened and the time occupied on the nuclear island site can be reduced; (2) By optimizing the number and position of the lifting lugs, increasing the number of lifting lugs and making the lifting lugs able to match two different lifting centers, the total load of the lifting equipment can meet the overall hoisting requirements, and can adapt to the overall hoisting strength requirements without complex modifications, while avoiding the problem of equipment center of gravity shift and improving hoisting accuracy. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1A flowchart illustrating the installation method of the ring crane equipment provided by this invention; Figure 2 A schematic diagram of the reinforced concrete support used in the installation method provided by the present invention; Figure 3 This is a front view schematic diagram of a ring-lifting device assembled using the installation method provided by the present invention; Figure 4 This is a three-dimensional schematic diagram of a ring hoisting device assembled using the installation method provided by the present invention; Figure 5 A top view of the gantry crane used in the installation method provided by the present invention; Figure 6 This is a frontal schematic diagram of a ring hoisting device being lifted using the installation method provided by this invention. Figure 7 This is a side view of the hoisting equipment being hoisted using the installation method provided by this invention; Figure 8 A schematic diagram of the balance beam used in the installation method provided by the present invention; Figure 9 A schematic diagram illustrating the assembly and application of the balance beam used in the installation method provided by this invention.

[0019] icon: 1-Reinforced concrete support; 2-Platform for boarding and emergency vehicles; 3-Guardrail; 4-Cable carriage; 5-Driver's cab; 6-Driver's cab platform; 7-Ring crane trolley; 8-Ring crane beam track; 9-Auxiliary hoisting mechanism; 10-Main hoisting mechanism; 12-First lifting lug; 13-Ring crane trolley; 14-Second lifting lug; 15-Balance beam; 151-Shackle; 152-Pull plate; 153-Adapter; 154-Crossbeam joint; 155-First section; 156-Second section; 16-Lifting sling. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The traditional ring-lift installation method has the following drawbacks: 1. Traditional ring crane installation often adopts a split-lifting mode. In nuclear power projects, the ring crane lifts the main trolley and the auxiliary trolley separately, which fails to make full use of the crane's lifting capacity. Moreover, this method requires electrical wiring, commissioning and other work to be completed at high altitudes in the nuclear island, which not only occupies the large-component lifting area for a long time, but also interferes with other operations in the nuclear island. In addition, split-lifting results in a large amount of work at height, high labor intensity for construction workers, prominent risks of cross-operation, and greater pressure on safety assurance.

[0022] 2. Regarding the foundation and tooling support, the foundation treatment of the ring crane assembly site lacks a specific plan, which can easily lead to problems such as excessive foundation settlement and uneven settlement, affecting the assembly accuracy.

[0023] 3. The design of the support frame did not fully consider the load-bearing requirements of the ring crane structure, resulting in insufficient load-bearing capacity and height that did not meet the installation requirements, thus failing to provide reliable support for the installation of the bottom platform of the ring crane.

[0024] 4. The strength verification of the lifting lugs is not comprehensive, and the selection of lifting slings lacks versatility. The lifting slings used in previous nuclear power reactors cannot be directly extended to subsequent reactor types, resulting in redundant research and development and waste.

[0025] 5. Low safety and precision control in hoisting: In traditional hoisting processes, the angle between the sling and the horizontal plane and the direction of the sling force are not well controlled, which can easily lead to uneven stress during hoisting; the wind resistance stability during the ring hoisting assembly process is insufficient, which poses a safety hazard when encountering severe weather; the trolley is prone to slippage and jumping during the overall hoisting, and the hoisting tilt is difficult to control, which may lead to interference with the surrounding structure.

[0026] Reference Figures 1 to 9 To address the aforementioned problems in the existing technology, the installation method for the ring-lifting equipment provided in this application includes the following steps: S1. Complete the pouring of four reinforced concrete piers 1 and test their bearing capacity.

[0027] Step S1 is the preparatory step for construction prerequisites, which includes technical preparation, personnel preparation, equipment preparation, site preparation, and material preparation. Technical preparation: Collect design drawings of the gantry crane equipment, site geological data, etc., compile an overall modular installation plan, hoisting plan, and quality plan, and complete plan review and technical briefing. Personnel preparation: All technical and construction-related personnel must be present, and all personnel must pass safety and technical training before starting work. Equipment preparation: Prepare gantry cranes, welding machines, total stations, settlement monitoring equipment, etc., ensure measuring instruments are calibrated, and complete and accept the manufacture of slings, support frames, and other tooling. Site preparation: Select a sandy soil site that has not been excavated for a long time, compact it with a road roller, pour four C20 reinforced concrete supports, and complete site bearing capacity testing to ensure that installation requirements are met. Material preparation: The gantry crane trolley 13, gantry crane auxiliary trolley 7, and accessories have passed inspection and are on site; the steel bars, concrete, angle steel, etc. for the support frames are in place; and the slings, shackles, counterweights, and other tooling are fully prepared.

[0028] Among them, on-site preparation is the core improvement step that distinguishes this application from the prior art.

[0029] S2. Complete the reinforcement binding and concrete pouring of the raft slab on the four reinforced concrete piers 1. After the curing period, conduct a bearing capacity test. Make 12 sets of reinforced concrete pads and place them on the raft slab. After the arrangement is completed, level the pads and set settlement observation points on them.

[0030] Step S2 involves site foundation treatment and pad installation. The specific implementation process is as follows: Position the raft foundation according to the design drawings, complete the reinforcement binding and concrete pouring, and conduct a bearing capacity test after the curing period. The method for conducting the bearing capacity test on the raft foundation is as follows: apply a 40t load to the raft foundation, hold the load for 10 minutes, and observe its settlement to ensure the foundation pressure is ≤0.46Mpa. After the raft foundation bearing capacity test is passed, pads are fabricated. During the fabrication of the pads, strictly control the dimensions and concrete strength, and complete the reinforcement, lug embedding, and angle steel edging according to the design requirements. The pads are precisely positioned on the supports, corresponding to the positions of the through reinforcement bars inside the main beam of the ring crane, ensuring that the four pads with embedded plates are adapted to specific installation requirements. After installation, the pads are leveled, and the elevation difference of the top surface of the pads is measured to ensure that the levelness requirements of the ring crane assembly are met. Settlement observation points are also set up, and settlement data is recorded regularly.

[0031] S3. Complete the overall assembly of each component of the ring crane on the four reinforced concrete supports 1. After the assembly is completed, carry out electrical wiring, line verification, electrical performance testing and simulation test on the ring crane.

[0032] Step S3 is the overall ground assembly step of the ring crane. The specific implementation process is as follows: the ring crane trolley and other components are hoisted to the assembly site, and the various components of the ring crane are assembled on the four C20 reinforced concrete supports 1 according to the process requirements, ensuring that all connection parts are tight and reliable; the installation sequence of each component is as follows: ring crane trolley 13, driver's cab 5, driver's cab platform 6, boarding and emergency vehicle platform 2, guardrail 3, ring crane trolley 7, main hoisting mechanism 10, auxiliary hoisting mechanism 9, cable carriage 4; after the overall mechanical assembly of the ring crane is completed, electrical wiring, wiring, insulation resistance testing and other work are carried out, and functional action simulation tests are conducted to ensure that most of the debugging work is completed on the ground.

[0033] It should be noted that the ring-shaped lifting beam track 8 is installed separately on the ring-shaped lifting beam platform inside the nuclear island.

[0034] S4. Install multiple first lifting lugs 12 and multiple second lifting lugs 14 on the ring crane trolley 13 in the ring crane equipment. The lifting center of the multiple first lifting lugs 12 coincides with the lifting center of the ring crane equipment, and the lifting center of the multiple second lifting lugs 14 coincides with the lifting center of the ring crane trolley 13.

[0035] Step S4 is the installation of lifting lugs and the adjustment of slings. In this step, this application configures two sets of lifting lugs on the ring crane trolley 13. All lifting lugs are made of Q355C and are the same size. The two sets of lifting lugs are respectively matched with the lifting center of the ring crane trolley 13 and the ring crane equipment as a whole, so that the total load of the slings meets the overall lifting requirements and improves the lifting accuracy.

[0036] S5. Using slings 16, simultaneously connect all first lifting lugs 12 and all second lifting lugs 14, and use a crane to hoist the entire ring-lifting equipment into position. While the ring-lifting equipment is in the hoisting state, refer to... Figure 6 and Figure 7 In the front view, the angle between each sling 16 and the horizontal plane is greater than or equal to 50°, and in the side view, the angle between the sling 16 connected to the first lifting lug 12 and the horizontal plane is less than or equal to 5°; the overall rated load capacity of the sling 16 is ≥680t.

[0037] Step S5 is the overall hoisting and positioning step, and its specific implementation process is as follows: Place a counterweight on the top of the non-electric beam of the hoisting equipment, and fix sleepers and rubber sheets on the lifting lugs or wedges to complete the leveling preparation; All first lifting lugs 12 and all second lifting lugs 14 are connected simultaneously using sling 16, and sling 16 is then connected to the gantry crane; Start the 1600t gantry crane and slowly lift the ring crane equipment; When the hoisting equipment is raised to a height of 100mm, pause and check the sling tension, pad detachment, and hoist level. Once everything is confirmed to be correct, continue raising. When the gantry crane is raised to the predetermined height, the running trajectory of the gantry crane is adjusted, and the gantry crane is transferred to the top of the nuclear island and slowly lowered. When the hoisting equipment is lowered to a height of 2m, adjust its center position. When the hoisting equipment is lowered to 1m, adjust the azimuth angle so that the support column at the bottom of the hoisting equipment is aligned with the guide device; When the hoisting equipment descends to 0.24m, check whether the force on each sling 16 is uniform. After confirming that there is no problem, slowly move it into the positioning position.

[0038] After positioning, measure the installation parameters such as the position, elevation, and level of the center point of the ring hoist. If there are deviations, adjust them by fine-tuning the crane or using the synchronous jacking system until they meet the design requirements.

[0039] In step S5, the lifting is carried out using the balance beam 15; refer to Figure 8 The balance beam 15 includes a main body of the beam, shackles 151, tie plates 152, adapters 153, and beam joints 154. The main body of the beam is composed of several beam sections spliced ​​together. The number of beam sections and the length of each beam section are adjusted according to the hoisting requirements. A beam joint 154 is provided at each end of the main body of the beam. Each beam joint 154 is hinged to a tie plate 152 by a pin. Multiple shackles 151 are provided at the bottom of each tie plate 152.

[0040] Among them: the two ends of the main beam are used to connect the crane; the shackle 151 is used to suspend the sling 16; the function of the pull plate 152 is to adjust the force balance by turning the angle according to the direction of the sling during hoisting so that its connection structure is consistent with the direction of the force of the sling on the front; the function of the adapter 153 is to adjust the force balance by turning the angle according to the direction of the sling during hoisting so that its connection structure is consistent with the direction of the resultant force of the slings at both ends on the side.

[0041] The number of crossbeam sections can be one, two, or more. For example... Figure 9 As shown, in this embodiment, there are two crossbeam sections of different lengths, namely the first section 155 and the second section 156. The flange face of the first section 155 is connected to the crossbeam joint 154 by bolts, and the other end can be selectively connected to the second section 156 or another crossbeam joint 154. The flange face of the second section 156 is connected to the crossbeam joint 154 by bolts, and the other end can be selectively connected to the first section 155 or another crossbeam joint 154.

[0042] This application adapts to the hoisting of different equipment by designing the main body of the crossbeam as spliced ​​from crossbeam sections of different lengths. This reduces the material procurement cost and design verification time for the overall fabrication of the balance beam, and makes it adaptable to the installation and hoisting construction of CAP series stackable ring cranes.

[0043] The balance beam 15, assembled from two adapters 153, two crossbeam joints 154, one shackle 151, and one first section 155, is used in the ring crane trolley 7 for lifting AP or CAP series stack types. For example... Figure 6 As shown, the balance beam 15, assembled from two adapters 153, two crossbeam joints 154, four shackles 151, four tie plates 152, and one second section 156, is used for the overall lifting of the AP stack-type ring crane equipment. Figure 9 As shown, the balance beam, assembled from 2 adapters 153, 2 crossbeam joints 154, 4 shackles 151, 4 tie plates 152, 1 first section 155, and 1 second section 156, is used for lifting with CAP series stacked ring cranes.

[0044] S6. If the installation parameters of the ring hoisting equipment do not meet the requirements after it is in place, a synchronous jacking system shall be used for adjustment. The synchronous jacking system includes multiple adjustment supports arranged on the ring hoisting beam platform within the nuclear island. Each adjustment support is equipped with two 100t hydraulic cylinders arranged in parallel, and the piston rods of the hydraulic cylinders can abut against the bottom of the ring hoisting equipment. The extension and retraction strokes of each hydraulic cylinder shall be adjusted according to the installation parameters of the ring hoisting equipment to ensure that the installation parameters of the ring hoisting equipment meet the requirements. Then, the ring hoisting equipment shall be fixed with shims and connecting bolts. It is preferred to use a symmetrical method to tighten the connecting bolts, and the bolt tightening torque shall reach 200 Nm.

[0045] S7. Conduct a load test on the installed ring crane equipment. After the load test is passed, remove the temporary facilities to complete the installation. Specifically, during the ring crane load test, gradually apply the rated load to check whether the lifting, running and other functions are normal, and whether the lifting lugs and slings are under stable stress. Temporary facilities include temporary lifting lugs, anchor cables, counterweights, etc. After the lifting lugs are removed, the installation parts of the lifting lugs are ground and inspected.

[0046] Finally, technical data and testing data from the construction process were collected and compiled into installation records, test reports, and other archives, and the project was accepted. The feasibility of applying AP stacker slings to CAP series stackers was analyzed, the length of the balance beam was adjusted to 10m, and compatibility testing was completed to provide technical support for subsequent project applications.

[0047] In summary, the installation method provided in this embodiment has the following beneficial effects: I. Improve construction efficiency The integrated assembly of the main crane and auxiliary crane allows most of the electrical wiring and commissioning to be completed on the ground, shortening the construction period. The universal design of the lifting slings avoids redundant development for different stack types, allowing direct expansion to subsequent stack types and saving R&D and procurement time. Standardized construction processes and tooling designs improve the first-time installation success rate and significantly reduce rework costs.

[0048] II. Enhancing Construction Safety The reduced working height eliminates the need for extensive scaffolding, significantly reducing the risks associated with working at heights and lowering the labor intensity for construction workers. Through multiple safeguards, including wind-resistant stability design, anti-slip measures for the trolley, and control of hoisting tilt, the static stability coefficient of the ring crane during assembly is greater than 1.4 against a category 10 typhoon. The crane operates with uniform stress and a stable center of gravity, effectively mitigating safety hazards such as collisions and slippage. The reduction in overlapping operations further lowers safety risks, resulting in a significant decrease in the incidence of construction safety accidents.

[0049] III. Improve installation accuracy Customized support frames and foundation treatment solutions control the total foundation settlement to ≤10mm and uneven settlement to ≤5mm, ensuring the precision of the ring crane assembly. The precise design of the lifting lugs and slings ensures that parameters such as sling angle and force direction strictly meet requirements, and that horizontality and verticality are precisely controlled during hoisting. Through synchronous leveling and real-time monitoring, all technical indicators of the ring crane installation meet design requirements, providing a reliable guarantee for subsequent equipment hoisting.

[0050] The installation method provided by this invention has been applied to AP stack type ring crane installation. Practical verification shows that using this method, the entire lifting process is collision-free and slippage-free, the ring crane's levelness and elevation meet technical requirements, the lifting cycle is shortened, the amount of work at height is reduced, and the lifting slings can be further extended to CAP series stack type lifting, avoiding redundant research and development waste, reducing overall construction costs, ensuring lifting quality and safety, and significantly improving construction efficiency and economy. It provides an efficient and feasible technical solution for AP and CAP series stack type ring crane lifting.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for installing a ring-type hoisting device, characterized in that, Includes the following steps: S1. Complete the pouring of four reinforced concrete piers (1) and their bearing capacity testing; S2. Complete the reinforcement binding and concrete pouring of the raft slab on four reinforced concrete piers (1), and conduct a bearing capacity test after the curing period. Make 12 sets of reinforced concrete pads, place the pads on the raft slab, level the pads after the arrangement is completed, and set settlement observation points on them. S3. Complete the overall assembly of each component of the ring crane on four reinforced concrete supports (1). After the assembly is completed, carry out electrical wiring, line verification, electrical performance testing and simulation test on the ring crane. S4. Install multiple first lifting lugs (12) and multiple second lifting lugs (14) on the ring crane trolley (13) in the ring crane equipment. The lifting center of the multiple first lifting lugs (12) coincides with the lifting center of the ring crane equipment, and the lifting center of the multiple second lifting lugs (14) coincides with the lifting center of the ring crane trolley (13). S5. Using slings (16), connect all the first lifting lugs (12) and all the second lifting lugs (14) at the same time, and use a crane to hoist the ring hoisting equipment into place as a whole.

2. The installation method of the ring crane equipment according to claim 1, characterized in that, In step S1, a sandy soil site that has not been excavated for a long time is selected, and after the site is compacted by a road roller, four reinforced concrete supports (1) are poured on the site.

3. The installation method of the ring crane equipment according to claim 1, characterized in that, In step S2, the method for conducting a bearing capacity test on the raft foundation is as follows: a 40t load is applied to the raft foundation, and after holding the load for 10 minutes, its settlement is observed to ensure that the foundation pressure is ≤0.46MPa.

4. The installation method of the ring crane equipment according to claim 1, characterized in that, In step S3, the installation sequence of each component in the ring crane equipment is as follows: ring crane trolley (13), driver's cab (5), driver's cab platform (6), boarding and emergency vehicle platform (2), guardrail (3), ring crane trolley (7), main lifting mechanism (10), auxiliary lifting mechanism (9), and cable carriage (4).

5. The installation method of the ring crane equipment according to claim 1, characterized in that, Step S5 specifically includes: Place a counterweight on the top of the non-electric beam of the hoisting equipment, and fix sleepers and rubber sheets on the lifting lugs or wedges to complete the leveling preparation; All first lifting lugs (12) and all second lifting lugs (14) are connected simultaneously using slings (16), and the slings (16) are connected to the gantry crane; Start the gantry crane and slowly lift the ring-lifting equipment; When the hoisting equipment is raised to a height of 100mm, pause and check. After confirming that there are no problems, continue raising. When the gantry crane is raised to the predetermined height, the running trajectory of the gantry crane is adjusted, and the gantry crane is transferred to the top of the nuclear island and slowly lowered into place.

6. The installation method of the ring crane equipment according to claim 5, characterized in that, In step S5: When the hoisting equipment is lowered to a height of 2m, adjust its center position; When the hoisting equipment is lowered to 1m, adjust the azimuth angle so that the support column at the bottom of the hoisting equipment is aligned with the guide device; When the hoisting equipment descends to 0.24m, check whether the force on each sling (16) is uniform. After confirming that there is no error, slowly move into the positioning position.

7. The installation method of the ring crane equipment according to claim 1, characterized in that, When the hoisting equipment is in the hoisting state, the angle between each sling (16) and the horizontal plane in the front view is greater than or equal to 50°, and the angle between the sling (16) connected to the first lifting lug (12) and the horizontal plane in the side view is less than or equal to 5°; the overall rated load capacity of the sling (16) is ≥680t.

8. The installation method of the ring crane equipment according to claim 1, characterized in that, In step S5, a balance beam (15) is used for hoisting; the balance beam (15) includes a beam body, shackles (151), pull plates (152), adapters (153) and beam joints (154). The beam body is spliced ​​from several beam sections. The number of beam sections and the length of each beam section are adjusted according to the hoisting requirements. A beam joint (154) is provided at each end of the beam body. Each beam joint (154) is hinged to a pull plate (152) by a pin. A plurality of shackles (151) are provided at the bottom of each pull plate (152). The two ends of the beam body are used to connect to the crane, and the shackles (151) are used to suspend the slings (16).

9. The installation method of the ring crane equipment according to claim 1, characterized in that, It also includes the following steps: S6. If the installation parameters of the ring hoisting equipment do not meet the requirements after it is in place, a synchronous jacking system is used for adjustment. The synchronous jacking system includes multiple adjustment fulcrums arranged on the ring hoisting beam platform within the nuclear island. Each adjustment fulcrum is equipped with two hydraulic cylinders arranged in parallel. The piston rods of the hydraulic cylinders can abut against the bottom of the ring hoisting equipment. The extension and retraction strokes of each hydraulic cylinder are adjusted according to the installation parameters of the ring hoisting equipment to ensure that the various installation parameters of the ring hoisting equipment meet the requirements. Then, the ring hoisting equipment is fixed by shims and connecting bolts.

10. The installation method of the ring crane equipment according to claim 9, characterized in that, It also includes the following steps: S7. After the installation of the ring crane equipment is completed, a load test is conducted. After the load test is passed, the temporary facilities are removed and the installation is completed.

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