Combined steel cable type generator stator hoisting construction process

Abstract

The invention discloses a combined steel cable type generator stator hoisting construction technology, relates to the technical field of generator stator hoisting, and aims to solve the problems of poor flexibility, high safety risk and low construction efficiency in a traditional hoisting technology. The field is flat and firm, and the foundation meets design requirements; preparing equipment and materials, selecting proper hoisting equipment and auxiliary materials, and checking the quality; technical and personnel preparation is carried out, a construction scheme and safety technical measures are formulated, and constructors are trained; s2, the hoisting equipment is installed and debugged, a rail bearing beam and a fixing frame with four stand columns are assembled, the rail bearing beam is installed and transversely limited, a movable frame is installed, a hydraulic lifting device is debugged, and it is ensured that the whole hoisting equipment operates normally; and S3, hoisting the generator stator. The method has the advantage of improving the construction flexibility, safety and construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of generator stator hoisting, and more particularly to a combined steel cable type generator stator hoisting construction process. Background Art

[0002] In the construction of power plants, the hoisting of generator stators is a key link. The current traditional hoisting technology has significant defects, which are mainly reflected in the construction efficiency. The process of traditional hoisting construction technology is cumbersome and complicated. Pre-hoisting preparation, equipment operation and subsequent disassembly all require a lot of manpower and time. For example, in the preparation stage, the work process of site handling and equipment assembly and commissioning is cumbersome and prone to delays. During the hoisting process, there are many operating steps and high coordination requirements, but there is a lack of efficient operation mode, resulting in slow overall progress. This not only greatly increases the construction cost, but also delays the construction period of the power plant, affects the timeliness of power supply, and is difficult to meet the current needs of rapid construction of power projects. In view of this, we propose a combined steel cable generator stator hoisting construction technology. Summary of the Invention

[0003] The purpose of the present invention is to provide a combined steel cable type generator stator hoisting construction process, aiming to solve the problems of poor flexibility, high safety risks and low construction efficiency existing in traditional hoisting processes.

[0004] To solve the above technical problems, the present invention provides the following technical solution: a combined cable-type generator stator hoisting construction process, the process comprising the following steps:

[0005] S1: Construction preparation, site and foundation preparation, ensuring the site is flat and solid and the foundation meets the design requirements;

[0006] Prepare equipment and materials, select appropriate lifting equipment and auxiliary materials, and check their quality;

[0007] Make technical and personnel preparations, formulate construction plans and safety technical measures, and train construction personnel;

[0008] S2: Installation and commissioning of hoisting equipment, assembling the rail beam and a fixed frame with four columns, installing the rail beam and setting lateral limits, installing the mobile frame and commissioning the hydraulic lifting device to ensure the normal operation of the entire hoisting equipment;

[0009] S3: Generator stator hoisting: Use a hydraulic lifting device to unload the truck and adjust the stator center. Lift the stator above the operating platform and then move it horizontally to the top of the installation position. Then lower the stator to the generator platform and perform preliminary alignment.

[0010] S4: Ensure construction safety by establishing a safety management system, setting up safety protection facilities, and establishing a safety risk monitoring and early warning mechanism to ensure a safe and reliable construction process.

[0011] Preferably, in the above step S1, the flatness, verticality and position accuracy of the foundation are strictly controlled during foundation construction, and the size, position and bearing capacity of the foundation are determined according to the layout of the lifting equipment and the position of the generator stator.

[0012] Preferably, in the above step S2, the horizontal and vertical spacings of the four columns of the fixing frame are 6.5 meters and 12 meters respectively, the columns are designed in sections and connected by bolts, the bottom of the lowest column is welded to the embedded steel plate, and the fixing frame is installed with a section support frame at an elevation of 2.5 meters.

[0013] Preferably, in the above step S2, the track-supporting beam has a transverse span of 6.5m and a longitudinal span of 38m, and is laid in an overlapping manner, with a transverse limiting beam provided every 12m, and the beam is provided at the lower chord of the track-supporting beam.

[0014] Preferably, in the above step S3, the lifting state of the stator is closely monitored during the lifting process, the translation accuracy is ensured by precisely controlling the speed and tension of the winch during the translation process, and a dedicated person is arranged to monitor the stator position during the lowering process.

[0015] Preferably, in the above step S4, the safety management system clearly defines the safety responsibilities of management personnel and construction personnel at all levels, the safety operating procedures and safety inspection system are detailed and specific, and safety education, training and assessment are conducted on construction personnel on a regular basis.

[0016] Preferably, in the above step S4, the safety protection facilities include setting up safety belts, safety nets and guardrails in the high-altitude working area, setting up warning signs in the lifting operation area, and regularly inspecting and maintaining construction equipment and tools.

[0017] Preferably, in the above step S4, the safety risk monitoring and early warning mechanism monitors the operating status of the lifting equipment and changes in the construction environment in real time, and issues an early warning signal and takes corresponding measures in a timely manner when it is detected that the safety risk index exceeds the early warning value.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention strictly controls the flatness, verticality and position accuracy of the foundation during the construction preparation stage, determines various parameters of the foundation according to the layout of the hoisting equipment and the position of the generator stator, provides a stable and reliable foundation support for the hoisting of the generator stator, ensures the stability of the stator during hoisting and subsequent operation, effectively avoids stator installation deviations caused by foundation problems, thereby improving the overall installation quality of the generator and ensuring its long-term stable operation.

[0020] 2. The present invention makes the installation and operation of the hoisting equipment more efficient by accurately designing and arranging the installation parameters of the fixed frame and the rail-bearing beam during the installation and commissioning stage of the hoisting equipment. During the generator stator hoisting stage, the translation accuracy is ensured by accurately controlling the winch speed and tension. The close coordination of various links reduces the adjustment and waiting time during the construction process. Compared with traditional processes, the construction efficiency is greatly improved and the construction period of the power plant is effectively shortened.

[0021] 3. The present invention establishes a complete safety management system, clarifies the safety responsibilities of personnel at all levels, formulates detailed safety operating procedures and inspection systems, and regularly conducts safety education, training and assessment of construction personnel, thereby improving the safety awareness and operational skills of construction personnel. At the same time, comprehensive safety protection facilities are set up to effectively reduce safety risks during the construction process. In addition, the safety risk monitoring and early warning mechanism can monitor the operating status of lifting equipment and changes in the construction environment in real time, promptly discover and deal with safety hazards, and further ensure the safety of the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the process flow in the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1

[0025] like Figure 1 As shown: Conduct a detailed survey of the lifting site to ensure that the site is flat and solid to meet the load-bearing requirements of the lifting equipment. According to the layout of the lifting equipment and the position of the generator stator, accurately determine the size, position and load-bearing capacity of the foundation, and carry out foundation construction. During the foundation construction process, strictly control the flatness, verticality and position accuracy of the embedded parts of the foundation to ensure that the foundation quality meets the design requirements.

[0026] The lifting equipment selected is a combination of a lifting frame and a steel cable hydraulic lifting device. This combined equipment has the characteristics of large load-bearing capacity and high lifting precision. According to the weight, size and lifting requirements of the generator stator, it is equipped with corresponding specifications and quantities of steel wire ropes, clamps, winch equipment and materials. All equipment and materials are subject to strict quality inspection and performance testing to ensure their reliable quality and good performance.

[0027] Organize technical personnel to conduct an in-depth review of the construction drawings, formulate detailed construction plans and safety technical measures based on the actual situation on site, and provide comprehensive technical training and safety briefings to personnel involved in lifting construction to familiarize them with the construction process, technical requirements and safety precautions, and ensure that construction personnel have proficient operating skills and safety awareness.

[0028] Assemble the rail beam fixing frame, which consists of 4 columns. The horizontal and vertical spacing of the 4 columns are precisely controlled to be 6.5 meters and 12 meters respectively to ensure the stability of the fixing frame. The columns adopt a segmented design to ensure that the elevations of the columns are consistent after assembly. Install a section support frame at an elevation of 2.5 meters on the fixing frame to leave a channel for stator transportation.

[0029] The installation center of the track beam is precisely aligned with the center of the column and is installed on the column and platform foundation. The horizontal span of the track beam is 6.5m and the vertical span is 38 meters long. It is laid in an overlapping manner. As the mobile frame moves, the track beam may move longitudinally. Therefore, it is necessary to set a horizontal limit for the track beam. A horizontal limit beam is set every 12m. The beam is set at the lower chord of the track beam to ensure the accuracy of the stator positioning.

[0030] The mobile frame consists of mobile legs, diagonal braces, hydraulic pump stations, steel strands and strand drums. The mobile frame is installed on the rail beam to ensure that it is firmly installed and runs smoothly. After the installation is completed, the various sections of the hydraulic lifting device are assembled and the entire system is fully debugged. The debugging content includes checking whether the climbing and lowering functions of the hydraulic jack are normal, whether the steel strands run smoothly, and whether the connection parts are firm. During the debugging process, the hydraulic jack on the mobile frame is subjected to a load test to ensure that its load test meets the qualified requirements before the formal lifting operation can be carried out.

[0031] A hydraulic lifting device is used to unload the generator stator from the transport vehicle. During the unloading process, the height and angle of the hydraulic lifting device are adjusted to accurately align the stator center with the stator seating center.

[0032] Operate the hydraulic lifting device to slowly lift the stator to above the operating platform, and make the bottom of the generator stator 200mm higher than the steam turbine platform. During the lifting process, pay close attention to the lifting status of the stator to ensure that it rises smoothly to avoid shaking and deviation. After lifting into place, pause the lifting and use the winch to pull the moving frame to move the stator horizontally to just above the installation position. During the translation process, ensure the translation accuracy of the stator by precisely controlling the speed and pulling force of the winch, so that the center of the stator is accurately aligned with the center of the installed position.

[0033] Start the hydraulic pump station and slowly lower the stator onto the generator platform. During the lowering process, arrange special personnel to monitor the position of the stator in real time to ensure that the stator is accurately positioned. After the stator is in position, release the stator lifting force, then slide the mobile frame away from the stator, and perform preliminary alignment on the stator. According to the center line of the steam turbine generator unit foundation, pull a 0.5mm steel wire through the generator stator, measure the distance between the generator stator core and the steel wire rope, and use the jack to adjust the vertical and horizontal center deviation of the generator stator to no more than 1mm to ensure the installation accuracy of the stator.

[0034] Establish and improve a comprehensive safety management system, clarify the safety responsibilities of managers and construction workers at all levels, formulate detailed safety operating procedures and safety inspection systems, strengthen safety education and training for construction workers, organize safety training and assessments regularly, and improve the safety awareness and operational skills of construction workers.

[0035] Complete safety protection facilities should be set up at the construction site to prevent construction workers from falling. Obvious warning signs should be set up in the lifting operation area to prohibit unauthorized personnel from entering. Construction equipment and tools should be inspected and maintained regularly to ensure their safety performance. For example, the hydraulic lifting device and winch's brake device and protective device should be inspected regularly. The wear of the wire rope should be checked regularly, and severely worn wire ropes should be replaced in time.

[0036] During the construction process, a safety risk monitoring and early warning mechanism is established to conduct real-time monitoring of the operating status of the lifting equipment and changes in the construction environment, such as monitoring the stability of the lifting frame, the pressure of the hydraulic system, and the wind speed parameters. When the safety risk indicators are monitored to exceed the warning value, a warning signal is issued in time and corresponding measures are taken to avoid the occurrence of safety accidents. At the same time, emergency plans are formulated and emergency drills are organized regularly to improve the ability to respond to sudden safety accidents.

[0037] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A combined cable-type generator stator hoisting construction process, characterized in that: The process includes the following steps: S1: Construction preparation, site and foundation preparation, ensuring the site is flat and solid and the foundation meets the design requirements; Prepare equipment and materials, select appropriate lifting equipment and auxiliary materials, and check their quality; Make technical and personnel preparations, formulate construction plans and safety technical measures, and train construction personnel; S2: Installation and commissioning of hoisting equipment, assembling the rail beam and a fixed frame with four columns, installing the rail beam and setting lateral limits, installing the mobile frame and commissioning the hydraulic lifting device to ensure the normal operation of the entire hoisting equipment; S3: Generator stator hoisting: Use a hydraulic lifting device to unload the truck and adjust the stator center. Lift the stator above the operating platform and then move it horizontally to the top of the installation position. Then lower the stator to the generator platform and perform preliminary alignment. S4: Ensure construction safety by establishing a safety management system, setting up safety protection facilities, and establishing a safety risk monitoring and early warning mechanism to ensure a safe and reliable construction process.

2. A combined cable-type generator stator hoisting construction process according to claim 1, characterized in that: In the above step S1, the flatness, verticality and position accuracy of the foundation are strictly controlled during foundation construction, and the size, position and bearing capacity of the foundation are determined according to the layout of the lifting equipment and the position of the generator stator.

3. The combined cable-type generator stator hoisting construction process according to claim 1, characterized in that: In the above step S2, the horizontal and vertical spacings of the four columns of the fixing frame are 6.5 meters and 12 meters respectively. The columns are designed in sections and connected by bolts. The bottom of the lowest column is welded to the embedded steel plate, and the fixing frame is installed with a section support frame at an elevation of 2.5 meters.

4. The combined cable-type generator stator hoisting construction process according to claim 1, characterized in that: In the above step S2, the track-bearing beam has a transverse span of 6.5m and a longitudinal span of 38m. It is laid in an overlapping manner, with a transverse limit beam set every 12m. The beam is set at the lower chord of the track-bearing beam.

5. The combined cable-type generator stator hoisting construction process according to claim 1, characterized in that: In the above step S3, the lifting state of the stator is closely monitored during the stator lifting process, the translation accuracy is ensured by precisely controlling the speed and tension of the winch during the translation process, and a dedicated person is arranged to monitor the stator position during the lowering process.

6. The combined cable-type generator stator hoisting construction process according to claim 1, characterized in that: In the above step S4, the safety management system clearly defines the safety responsibilities of management personnel and construction personnel at all levels, the safety operating procedures and safety inspection system are detailed and specific, and safety education, training and assessment are conducted on construction personnel on a regular basis.

7. The combined cable-type generator stator hoisting construction process according to claim 1, characterized in that: In the above step S4, the safety protection facilities include setting up safety belts, safety nets and guardrails in the high-altitude working area, setting up warning signs in the lifting operation area, and regularly inspecting and maintaining construction equipment and tools.

8. The combined cable-type generator stator hoisting construction process according to claim 1, characterized in that: In the above step S4, the safety risk monitoring and early warning mechanism monitors the operating status of the lifting equipment and changes in the construction environment in real time, and issues an early warning signal and takes corresponding measures in a timely manner when it is detected that the safety risk index exceeds the early warning value.

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