Nuclear power reactor building outer dome and mounting method thereof

Abstract

The invention relates to a nuclear power reactor building outer dome and an installation method thereof.In the nuclear power reactor building outer dome, on one hand, steel molds are prefabricated into steel mold units in a factory in a blocking mode, after the steel mold units are transported to a site, the steel mold units are spliced into a finished steel mold on the site, and then the steel mold is integrally hoisted to the top of a corresponding reactor building; and a scaffold does not need to be erected on the inner dome, so that the construction process is greatly simplified, a large amount of time and manpower resources are saved, and the construction efficiency is improved. And on the other hand, all the steel molds are directly hoisted after off-site assembly is completed, a scaffold for supporting the outer dome does not need to be erected outside the inner dome, the construction period is effectively shortened, and the project progress is accelerated.

Description

Technical Field

[0001] The invention relates to the field of nuclear power, and in particular to an outer dome of a nuclear power reactor building and an installation method thereof. Background Art

[0002] The reactor building of a nuclear power plant usually adopts a double-layer containment structure, in which the outer containment dome is a reinforced concrete structure. At present, the construction of the outer containment dome generally adopts a full wooden formwork system or a wooden formwork + steel formwork system. The specific construction steps include: Scaffolding construction, setting up scaffolding on the concrete surface of the inner dome to support and fix the formwork. Formwork installation, installing wooden formwork or steel formwork. For steel formwork, it is usually necessary to hoist it into place in blocks and then weld it into a whole. Rebar tying, after the formwork is installed, the steel bars are tied. Concrete pouring, after the steel bars are tied, the concrete is poured.

[0003] Although the existing formwork system meets the construction needs to a certain extent, there are still the following main problems:

[0004] Scaffolding construction is time-consuming and laborious. Building scaffolding on the inner dome not only requires a lot of time and manpower, but also increases construction costs. The formwork is difficult to remove. After the concrete is poured, the internal scaffolding and formwork need to be removed. Due to the narrow space between the inner and outer domes, the demolition operation is very difficult and the construction period is long. The safety risk is high. Carrying out demolition work in a small and relatively confined space poses a high safety risk and poses a threat to the safety of construction workers. Summary of the invention

[0005] In view of the above technical problems, the present invention provides an outer dome of a nuclear power reactor building and an installation method thereof.

[0006] The present invention provides an outer dome of a nuclear power reactor building, which comprises:

[0007] A plurality of steel mold units, each of which comprises a plurality of annular reinforcing ribs and a plurality of radial reinforcing ribs, one end of each of the radial reinforcing ribs being connected to each other to form a central end of the steel mold unit, the other end of each of the radial reinforcing ribs forming a peripheral end of the steel mold unit, each of the radial reinforcing ribs being arranged at equal angles, each of the annular reinforcing ribs being connected to each of the radial reinforcing ribs, and the radius of each of the annular reinforcing ribs gradually increasing in a direction away from the central end;

[0008] Among them, each of the central ends is connected to each other to form the center of the dome, each of the peripheral ends surrounds the center of the dome to form the periphery of the dome, and the parts with the same radius in each of the annular reinforcement ribs are connected end to end around the center of the dome to form a number of annular reinforcement ribs. Each of the steel mold units together constitutes a dome steel mold, and a number of lifting points are arranged on the dome steel mold for lifting the dome steel mold as a whole.

[0009] Preferably, each of the radial reinforcing ribs comprises a plurality of radial main reinforcing ribs and a plurality of radial secondary reinforcing ribs, and one end of each of the radial reinforcing ribs is connected to each other to form the central end;

[0010] One end of each of the radial secondary reinforcing ribs faces the central end, and the other end of each of the radial reinforcing ribs and the end of each of the radial main reinforcing ribs together form the peripheral end.

[0011] Preferably, on the dome steel mold, each of the radial reinforcing ribs includes thirty radial main reinforcing ribs, and each of the radial main reinforcing ribs is arranged at equal angles.

[0012] Preferably, each of the radial reinforcing ribs includes ninety radial secondary reinforcing ribs, and each of the radial secondary reinforcing ribs is arranged at equal angles.

[0013] Preferably, the radial main reinforcing rib comprises a main reinforcing angle steel, the first side width of the main reinforcing angle steel is 200 mm, the second side width of the main reinforcing angle steel is 125 mm, and the thickness of the main reinforcing angle steel is 12 mm; and / or

[0014] The radial secondary reinforcing rib comprises a secondary reinforcing angle steel, a first side width of the secondary reinforcing angle steel is 75 mm, a second side width of the secondary reinforcing angle steel is 50 mm, and a thickness of the secondary reinforcing angle steel is 8 mm.

[0015] Preferably, on the dome steel mold, the parts of the annular reinforcing ribs with the same radius are connected end to end one by one, so that the annular reinforcing ribs form nine annular reinforcing ribs;

[0016] Each of the annular reinforcement ribs comprises an annular reinforcement angle steel, the first side width of the annular reinforcement angle steel is 200 mm, the second side width of each of the annular reinforcement angle steel is 125 mm, and the thickness of each of the annular reinforcement angle steel is 12 mm.

[0017] The present invention also provides a method for installing an outer dome of a nuclear power reactor building, which comprises:

[0018] Obtain each steel mold unit described in any one of the above technical solutions;

[0019] The central ends of the steel mold units are connected to each other to form the center of the dome, the peripheral ends of the steel mold units are connected one by one around the center of the dome to form the periphery of the dome, and the parts with the same radius in the annular reinforcement ribs are connected to form a plurality of annular reinforcement ribs, so that the steel mold units form a dome steel mold;

[0020] A plurality of lifting points are arranged on the dome steel formwork, each of the lifting points is connected to a lifting device, and the dome steel formwork is lifted to a predetermined installation position by the lifting device;

[0021] The dome steel formwork is poured with concrete.

[0022] Preferably, the step of connecting the central ends of the steel mold units to form the center of the dome comprises:

[0023] The central ends are brought close together and abutted against each other and then welded together, so that the central ends together form the center of the dome.

[0024] Preferably, the step of connecting the parts of the annular reinforcing ribs having the same radius to form a plurality of annular reinforcing ribs comprises:

[0025] Among the annular reinforcement ribs, the annular reinforcement ribs with the same radius are connected one by one, so that each part of the annular reinforcement ribs with the same radius can form a corresponding annular reinforcement rib.

[0026] Preferably, contact positions of every two adjacent steel mold units are welded together.

[0027] The implementation of the present invention has the following beneficial effects:

[0028] The present invention relates to an outer dome of a nuclear power reactor building and an installation method thereof. In the outer dome of the nuclear power reactor building, on the one hand, a steel mold is prefabricated into various steel mold units in a factory, which are transported to a site and then assembled into a completed steel mold on site. The steel mold is then hoisted as a whole to the top of the corresponding reactor building without setting up a scaffold on the inner dome, thereby greatly simplifying the construction process, saving a lot of time and human resources, and improving construction efficiency.

[0029] On the other hand, the steel molds of the present invention are directly hoisted after being assembled off-site, without the need to set up a scaffolding outside the inner dome to support the outer dome, which effectively shortens the construction period and speeds up the project progress.

[0030] In addition, the installation and disassembly process of the steel formwork (composed of various steel formwork units) of the present invention is performed externally, without the need for workers to enter the narrow and relatively closed space between the inner and outer domes, which greatly improves the safety of the construction process. In addition, the split setting of the steel formwork units also improves the safety during transportation and installation, ensuring the safety and controllability of the entire construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0032] Figure 1is a schematic diagram of a structure in which a dome outside a nuclear power reactor building is installed at a predetermined position in some embodiments of the present invention;

[0033] Figure 2 is a schematic diagram of the structure of the outer dome of a nuclear power reactor building in some embodiments of the present invention;

[0034] Figure 3 From another perspective Figure 2 The schematic diagram of the structure of the outer dome of the nuclear power reactor building is shown;

[0035] Figure 4 is an exploded view of an outer dome of a nuclear power reactor building in some embodiments of the present invention;

[0036] Figure 5 is a flow chart of a method for installing an outer dome of a nuclear power reactor building in some embodiments of the present invention;

[0037] Figure 6 It is a schematic structural diagram of the outer dome of a nuclear power reactor building in other embodiments of the present invention. DETAILED DESCRIPTION

[0038] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0039] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Figure 1 FIG. 1 shows an outer dome 10 of a nuclear power reactor building in some embodiments of the present invention. Figures 1 to 4 As shown, the outer dome 10 of the nuclear power reactor building includes a plurality of steel mold units 1, each of which includes a plurality of annular reinforcing ribs 11 and a plurality of radial reinforcing ribs 12, one end of each radial reinforcing rib 12 is connected to each other to form a central end 13 of the steel mold unit 1, and the other end of each radial reinforcing rib 12 forms a peripheral end 14 of the steel mold unit 1, each radial reinforcing rib 12 is arranged at equal angles, each annular reinforcing rib 11 is connected to each radial reinforcing rib 12, and the radius of each annular reinforcing rib 11 gradually increases in a direction away from the central end 13;

[0043] Among them, each center end 13 is connected to each other to form a dome center 2, each peripheral end 14 surrounds the dome center 2 to form a dome periphery 3, and the parts with the same radius in each annular reinforcement rib 11 are connected end to end around the dome center 2 to form a plurality of annular reinforcement ribs 4. Each steel mold unit 1 together constitutes a dome steel mold 20, and a plurality of lifting points 30 are arranged on the dome steel mold 20 for lifting the dome steel mold 20 as a whole.

[0044] It can be understood that the annular reinforcement ribs 11 are used to enhance the lateral stability of the steel mold unit 1 and ensure its structural strength during hoisting and use. The annular reinforcement ribs 11 are evenly distributed along the arc surface of the steel mold unit 1, increasing the overall rigidity of the steel mold unit 1.

[0045] One end of the radial reinforcement ribs 12 is connected to form the center end 13 of the steel mold unit 1, and the other end forms the peripheral end 14 of the steel mold unit 1. The radial reinforcement ribs 12 are arranged at equal angles to evenly distribute the force and ensure the overall rigidity and stability of the steel mold unit 1.

[0046] The center end 13 is formed by connecting one end of each radial reinforcement rib 12, and is used to form the center part of the dome steel mold 20. The setting of the center end 13 ensures that each steel mold unit 1 can be accurately butted when assembled to form a complete circular center.

[0047] The peripheral edge 14 is formed by the other end of each radial reinforcement rib 12, and is the edge portion of the steel mold unit 1. The arrangement of the peripheral edge 14 ensures that each steel mold unit 1 can form a complete circular periphery when assembled.

[0048] like Figures 1 to 4 As shown, in some embodiments of the outer dome 10 of a nuclear power reactor building, each radial reinforcing rib 12 includes a plurality of radial main reinforcing ribs 121 and a plurality of radial secondary reinforcing ribs 122, and one end of each radial reinforcing rib 12 is connected to each other to form a central end 13;

[0049] One end of each radial secondary reinforcing rib 122 faces the central end 13 , and the other end of each radial reinforcing rib 12 and the end of each radial main reinforcing rib 121 together form a peripheral end 14 .

[0050] It can be understood that the radial main reinforcing rib 121 plays the main supporting and reinforcing role. One end of the radial main reinforcing rib 121 is connected with one end of other radial main reinforcing ribs 121 to form a central end 13, and the other end is connected with the end of the radial secondary reinforcing rib 122 to form a peripheral end 14. The design of the radial main reinforcing rib 121 ensures the overall rigidity and stability of the steel mold unit 1 during hoisting and use.

[0051] The radial secondary reinforcing ribs 122 are used to further enhance the local rigidity and stability of the steel mold unit 1. The provision of the radial secondary reinforcing ribs 122 enables the steel mold unit 1 to better disperse stress when subjected to force, thereby avoiding local stress concentration.

[0052] like Figures 1 to 4 As shown, in some embodiments of the outer dome 10 of a nuclear power reactor building, on the dome steel mold 20, each radial reinforcing rib 12 includes thirty radial main reinforcing ribs 121, and each radial main reinforcing rib 121 is arranged at equal angles.

[0053] It can be understood that the thirty radial main reinforcing ribs 121 are arranged at equal angles, so that the steel mold unit 1 can withstand a large load during hoisting and use, avoiding deformation and damage. This equal angle spacing also ensures uniform distribution of force and improves the safety and reliability of the overall structure.

[0054] like Figures 1 to 4 As shown, in some embodiments of the outer dome 10 of a nuclear power reactor building, each radial reinforcing rib 12 includes ninety radial secondary reinforcing ribs 122, and each radial secondary reinforcing rib 122 is arranged at equal angles.

[0055] It can be understood that the radial secondary reinforcing ribs 122 are also arranged at equal angles. One end of each radial secondary reinforcing rib 122 faces the central end 13, and the other end and the end of the radial main reinforcing rib 121 together form the peripheral end 14. The arrangement of the radial secondary reinforcing ribs 122 further enhances the local rigidity and stability of the steel mold unit 1, disperses the stress, and avoids local stress concentration.

[0056] Specifically, Figures 1 to 4 As shown, the radial main reinforcing rib 121 includes a main reinforcing angle steel, the first side width of the main reinforcing angle steel is 200 mm, the second side width of the main reinforcing angle steel is 125 mm, and the thickness of the main reinforcing angle steel is 12 mm. It should be noted that such a size setting of the main reinforcing angle steel ensures that the radial main reinforcing rib 121 has sufficient strength and rigidity, can withstand a large load during hoisting and use, and avoid deformation and damage.

[0057] Specifically, Figures 1 to 4 As shown, the radial secondary reinforcing rib 122 includes a secondary reinforcing angle steel, the first side width of the secondary reinforcing angle steel is 75 mm, the second side width of the secondary reinforcing angle steel is 50 mm, and the thickness of the secondary reinforcing angle steel is 8 mm. It should be noted that such a size setting of the secondary reinforcing angle steel ensures that the radial main reinforcing rib 121 has sufficient strength and rigidity, can withstand a large load during hoisting and use, and avoid deformation and damage.

[0058] like Figures 1 to 4 As shown, in some embodiments of the outer dome 10 of a nuclear power reactor building, on the dome steel mold 20, the parts with the same radius in each annular reinforcing rib 11 are connected end to end one by one, so that each annular reinforcing rib 11 forms nine annular reinforcing ribs 4.

[0059] It can be understood that the annular reinforcing ribs 4 are evenly distributed along the arc surface of the steel mold unit 1 , thereby increasing the overall rigidity of the steel mold unit 1 .

[0060] Furthermore, if Figures 1 to 4 As shown, each annular reinforcing rib 4 includes an annular reinforcing angle steel, the first side width of the annular reinforcing angle steel is 200 mm, the second side width of each annular reinforcing angle steel is 125 mm, and the thickness of each annular reinforcing angle steel is 12 mm. It should be noted that the size design of the annular reinforcing angle steel ensures that the radial main reinforcing rib 121 has sufficient strength and rigidity, can withstand large loads during hoisting and use, and avoid deformation and damage.

[0061] The present invention also provides a method for installing an outer dome of a nuclear power reactor building, which comprises:

[0062] The steel mold units of the outer dome of the nuclear power reactor building of the present invention are obtained. It can be understood that each steel mold unit 1 includes a plurality of annular reinforcing ribs 11 and a plurality of radial reinforcing ribs 12 .

[0063] The central ends of each steel mold unit are connected to each other to form the center of the dome, the peripheral ends of each steel mold unit are connected one by one around the center of the dome to form the periphery of the dome, and the parts with the same radius in each annular reinforcement rib are connected respectively to form a number of annular reinforcement ribs, and then each steel mold unit constitutes a dome steel mold.

[0064] A plurality of lifting points are arranged on the dome steel formwork, each lifting point is connected to a lifting device, and the dome steel formwork is lifted to a predetermined installation position by the lifting device. It can be understood that the number and specific setting positions of the lifting points can be flexibly set, and it is preferred to be able to stably lift the dome steel formwork.

[0065] The dome steel formwork is poured with concrete. It can be understood that after the steel formwork unit 1 is fixed, the steel bars are tied. Then the concrete is poured. After the pouring is completed, the steel formwork unit 1 serves as a permanent steel lining of the outer dome concrete structure without removal.

[0066] It should be noted that, in the factory, according to the design drawings, the steel mold unit 1 is prefabricated in blocks. Each steel mold unit 1 is equipped with an annular reinforcement rib 11 and a radial reinforcement rib 12 to ensure its structural strength and rigidity.

[0067] The prefabricated steel formwork units 1 are transported to the construction site and assembled at the hoisting site. During the assembly process, ensure that the central ends 13 of each steel formwork unit 1 are connected to each other to form the dome center 2. At the same time, the peripheral ends 14 of each steel formwork unit 1 are connected one by one around the dome center 2 to form the dome periphery 3.

[0068] A plurality of lifting points 30 are arranged on the dome steel form 20 to ensure uniform force during the lifting process and avoid local stress concentration. The positions of the lifting points 30 should be calculated and designed to ensure the safety and reliability of the lifting process.

[0069] During the pouring process, the uniform distribution and density of the concrete should be ensured.

[0070] like Figures 1 to 5 As shown, in some embodiments of the method for installing the outer dome of a nuclear power reactor building, connecting the central ends of each steel mold unit to each other to form the center of the dome includes: bringing the central ends close to each other and then welding them together, so that the central ends together form the center of the dome.

[0071] It can be understood that the center ends 13 of each steel mold unit 1 are brought close to and abutted together. Ensure that the contact surface of each center end 13 is flat and tightly fitted for subsequent welding operations. Use welding equipment to weld and connect each center end 13. During the welding process, ensure the quality and strength of the weld, avoid false welding or weld discontinuity, ensure that each center end 13 is firmly connected together, and jointly form the dome center 2, providing a reliable structural foundation for subsequent assembly and hoisting.

[0072] like Figures 1 to 5 As shown, in some embodiments of the method for installing the outer dome of a nuclear power reactor building, the parts with the same radius in each annular reinforcement rib are connected respectively to form a plurality of annular reinforcement ribs, including: in each annular reinforcement rib, the annular reinforcement ribs with the same radius are connected one by one, so that each part of the annular reinforcement ribs with the same radius can form a corresponding annular reinforcement rib.

[0073] It can be understood that after the steel mold units 1 are correctly assembled, the annular reinforcement ribs 11 on each steel mold unit 1 will be aligned with each other, and each annular reinforcement rib 11 will be aligned with the annular reinforcement ribs 11 with the same radius on the remaining steel mold units 1. The annular reinforcement ribs 11 with the same radius are connected end to end one by one using welding equipment or other connection methods to form a complete annular reinforcement rib 4.

[0074] like Figures 1 to 5 As shown, in some embodiments of the method for installing the outer dome of a nuclear power reactor building, contact positions of every two adjacent steel form units are welded.

[0075] Understandably, ensure that the contact surface is flat and free of impurities to ensure the quality of welding. Start from one end of the contact position and weld section by section to ensure the continuity and strength of the weld. After welding is completed, perform visual inspection of the weld and necessary non-destructive testing to ensure the quality and integrity of the weld.

[0076] like Figure 6 As shown, in some embodiments of the outer dome 10 of a nuclear power reactor building, the dome steel mold 20 is provided with a plurality of levels of steel molds along the height direction, and at least some of the levels of steel molds can be further divided into a plurality of steel mold units 1.

[0077] It can be understood that one of the steel mold units 1 is located at the center of the dome steel mold and has a dome center 2, and the remaining steel mold units 1 at non-center positions are spliced ​​one by one around the outer periphery of the steel mold unit 1 at the center position, so that they can be directly assembled into a complete dome steel mold 20 at the construction site, and then the dome steel mold 20 can be hoisted to the predetermined installation position.

[0078] It should be noted that, on a dome steel form 20, the outer contours of each steel form unit 1 can be flexibly set according to actual construction requirements, as long as they can be assembled and connected on site to form the required dome steel form 20. Figure 6 As shown, the dome steel mold 2 can be configured along Figure 6 The dashed lines in the figure are divided into several steel mold units 1, and each steel mold unit 1 can be transported to the construction site for assembly after being manufactured separately. Figure 4 Distinguish in the manner shown.

[0079] The implementation of the present invention has the following beneficial effects:

[0080] The present invention relates to an outer dome of a nuclear power reactor building and an installation method thereof. In the outer dome of the nuclear power reactor building, on the one hand, a steel mold is prefabricated into various steel mold units in a factory, which are transported to a site and then assembled into a completed steel mold on site. The steel mold is then hoisted as a whole to the top of the corresponding reactor building without setting up a scaffold on the inner dome, thereby greatly simplifying the construction process, saving a lot of time and human resources, and improving construction efficiency.

[0081] On the other hand, the steel molds of the present invention are directly hoisted after being assembled off-site, without the need to set up a scaffolding outside the inner dome to support the outer dome, which effectively shortens the construction period and speeds up the project progress.

[0082] In addition, the installation and disassembly process of the steel formwork (composed of various steel formwork units) of the present invention is performed externally, without the need for workers to enter the narrow and relatively closed space between the inner and outer domes, which greatly improves the safety of the construction process. In addition, the split setting of the steel formwork units also improves the safety during transportation and installation, ensuring the safety and controllability of the entire construction process.

[0083] The scheme of the present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present invention. In addition, it can be understood that the steps in the method of the embodiment of the present invention can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present invention can be merged, divided and deleted according to actual needs.

[0084] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A dome outside a nuclear power reactor building, characterized in that: include: A plurality of steel mold units, each of which comprises a plurality of annular reinforcing ribs and a plurality of radial reinforcing ribs, one end of each of the radial reinforcing ribs being connected to each other to form a central end of the steel mold unit, the other end of each of the radial reinforcing ribs forming a peripheral end of the steel mold unit, each of the radial reinforcing ribs being arranged at equal angles, each of the annular reinforcing ribs being connected to each of the radial reinforcing ribs, and the radius of each of the annular reinforcing ribs gradually increasing in a direction away from the central end; Among them, each of the central ends is connected to each other to form the center of the dome, each of the peripheral ends surrounds the center of the dome to form the periphery of the dome, and the parts with the same radius in each of the annular reinforcement ribs are connected end to end around the center of the dome to form a number of annular reinforcement ribs. Each of the steel mold units together constitutes a dome steel mold, and a number of lifting points are arranged on the dome steel mold for lifting the dome steel mold as a whole.

2. The outer dome of a nuclear power reactor building according to claim 1, characterized in that: Each of the radial reinforcement ribs includes a plurality of radial main reinforcement ribs and a plurality of radial secondary reinforcement ribs, and one end of each of the radial reinforcement ribs is connected to each other to form the central end; One end of each of the radial secondary reinforcing ribs faces the central end, and the other end of each of the radial reinforcing ribs and the end of each of the radial main reinforcing ribs together form the peripheral end.

3. The outer dome of a nuclear power reactor building according to claim 2, characterized in that: On the dome steel mold, each of the radial reinforcing ribs includes thirty radial main reinforcing ribs, and each of the radial main reinforcing ribs is arranged at equal angles.

4. The outer dome of a nuclear power reactor building according to claim 2 or 3, characterized in that: Each of the radial reinforcing ribs includes ninety radial secondary reinforcing ribs, and each of the radial secondary reinforcing ribs is arranged at equal angles.

5. The outer dome of a nuclear power reactor building according to claim 2 or 3, characterized in that: The radial main reinforcing rib comprises a main reinforcing angle steel, the first side width of the main reinforcing angle steel is 200 mm, the second side width of the main reinforcing angle steel is 125 mm, and the thickness of the main reinforcing angle steel is 12 mm; and / or The radial secondary reinforcing rib comprises a secondary reinforcing angle steel, a first side width of the secondary reinforcing angle steel is 75 mm, a second side width of the secondary reinforcing angle steel is 50 mm, and a thickness of the secondary reinforcing angle steel is 8 mm.

6. The outer dome of a nuclear power reactor building according to claim 1, characterized in that: On the dome steel mold, the parts of the annular reinforcing ribs with the same radius are connected end to end one by one, so that the annular reinforcing ribs form nine annular reinforcing ribs; Each of the annular reinforcement ribs comprises an annular reinforcement angle steel, the first side width of the annular reinforcement angle steel is 200 mm, the second side width of each of the annular reinforcement angle steel is 125 mm, and the thickness of each of the annular reinforcement angle steel is 12 mm.

7. A method for installing an outer dome of a nuclear power reactor building, characterized in that: include: Obtain each steel mold unit as described in any one of claims 1 to 6; The central ends of the steel mold units are connected to each other to form the center of the dome, the peripheral ends of the steel mold units are connected one by one around the center of the dome to form the periphery of the dome, and the parts with the same radius in the annular reinforcement ribs are connected to form a plurality of annular reinforcement ribs, so that the steel mold units form a dome steel mold; A plurality of lifting points are arranged on the dome steel formwork, each of the lifting points is connected to a lifting device, and the dome steel formwork is lifted to a predetermined installation position by the lifting device; The dome steel formwork is poured with concrete.

8. The method for installing the outer dome of a nuclear power reactor building according to claim 7, characterized in that: The method of connecting the central ends of the steel mold units to form the center of the dome comprises: The central ends are brought close together and abutted against each other and then welded together, so that the central ends together form the center of the dome.

9. The method for installing the outer dome of a nuclear power reactor building according to claim 7, characterized in that: The step of connecting the parts of the annular reinforcing ribs having the same radius to form a plurality of annular reinforcing ribs comprises: Among the annular reinforcement ribs, the annular reinforcement ribs with the same radius are connected one by one, so that each part of the annular reinforcement ribs with the same radius can form a corresponding annular reinforcement rib.

10. The method for installing the outer dome of a nuclear power reactor building according to claim 7, characterized in that: The contact positions of every two adjacent steel mold units are welded together.

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