Nuclear power reactor plant outer dome and method of installing same

Abstract

The present application relates to a kind of nuclear power reactor plant outer dome and its installation method, in the nuclear power reactor plant outer dome, on the one hand, steel mould is prefabricated into each steel mould unit in factory block, after being transported to site, each steel mould unit is assembled into completed steel mould in site, and steel mould is hoisted to the top of corresponding reactor plant as a whole, without erecting scaffold on inner dome, so that the construction process is greatly simplified, a large amount of time and human resources are saved, and construction efficiency is improved.Another aspect, each steel mould of the present application is directly hoisted after being assembled to completion outside site, without erecting scaffold for supporting outer dome outside inner dome, effectively shortening construction period, and accelerating engineering progress.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear power, in particular to a nuclear power reactor plant outer dome and a method for installing the same. BACKGROUND

[0002] The reactor plant of a nuclear power plant usually adopts a double containment shell structure, wherein the outer dome of the containment shell is a reinforced concrete structure. At present, the construction of the outer dome of the containment shell generally adopts a full wooden formwork system or a wooden formwork + steel formwork system. The specific construction steps include: scaffold erection, a scaffold is erected on the inner dome concrete surface to support and fix the formwork; formwork installation, a wooden formwork or a steel formwork is installed, and for the steel formwork, it is usually required to be hoisted into place in blocks and then welded into a whole; steel bar binding, after the formwork installation is completed, steel bar binding is performed; and concrete pouring, after the steel bar binding is completed, concrete pouring is performed.

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

[0004] The scaffold erection is time-consuming and laborious, and the erection of the scaffold on the inner dome not only requires a large amount of time and manpower, but also increases the construction cost. The formwork is difficult to remove, and after the concrete pouring is completed, the internal scaffold and the formwork need to be removed. Due to the narrow space between the inner dome and the outer dome, the removal operation is very difficult, and the construction period is long. The safety risk is high, and the removal operation in the narrow and relatively closed space has a high safety risk, which threatens the safety of the construction personnel. SUMMARY

[0005] In view of the above technical problems, the present application provides a nuclear power reactor plant outer dome and a method for installing the same.

[0006] The present application provides a nuclear power reactor plant outer dome, which comprises:

[0007] a plurality of steel formwork units, each of the steel formwork units comprises a plurality of radial reinforcing ribs and a plurality of circumferential reinforcing ribs, one end of each of the radial reinforcing ribs is connected to each other to form a center end of the steel formwork unit, the other end of each of the radial reinforcing ribs forms a peripheral end of the steel formwork unit, each of the radial reinforcing ribs is arranged at an equal angle interval, each of the circumferential reinforcing ribs is connected to each of the radial reinforcing ribs, and the radius of each of the circumferential reinforcing ribs gradually increases in a direction away from the center end;

[0008] wherein the center ends are connected to each other to form a dome center, the peripheral ends surround the dome center to form a dome periphery, the portions with the same radius in each of the circumferential reinforcing ribs are connected end to end around the dome center to form a plurality of annular reinforcing ribs, and the steel formwork units collectively form a dome steel formwork, and a plurality of lifting points are arranged on the dome steel formwork for lifting the dome steel formwork as a whole.

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

[0010] One end of each of the radial secondary reinforcing ribs is directed towards the central end, and the other end of each of the radial reinforcing ribs and the end of each of the radial primary reinforcing ribs together form the peripheral end.

[0011] Preferably, on the dome steel mold, each of the radial reinforcing ribs comprises thirty radial primary reinforcing ribs, and each of the radial primary reinforcing ribs is arranged at an equal angle interval.

[0012] Preferably, each of the radial reinforcing ribs comprises ninety radial secondary reinforcing ribs, and each of the radial secondary reinforcing ribs is arranged at an equal angle interval.

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

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

[0015] Preferably, on the dome steel mold, each of the radial reinforcing ribs comprises thirty radial primary reinforcing ribs, and each of the radial primary reinforcing ribs is arranged at an equal angle interval.

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

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

[0018] Obtaining each of the steel mold units in any one of the above technical solutions;

[0019] Connecting the central ends of each of the steel mold units to each other to form a dome center, connecting the peripheral ends of each of the steel mold units around the dome center to form a dome periphery, connecting each of the parts with the same radius in each of the annular reinforcing ribs to form a plurality of annular reinforcing ribs, and then each of the steel mold units forms a dome steel mold;

[0020] Providing a plurality of lifting points on the dome steel mold, connecting each of the lifting points to a lifting device, and lifting the dome steel mold to a predetermined installation position by the lifting device.

[0021] The concrete is poured into the dome-shaped steel mold.

[0022] Preferably, the connecting the center ends of each of the steel mold units to form a dome-shaped center comprises:

[0023] The center ends are abutted and welded to form the dome-shaped center.

[0024] Preferably, the connecting the portions with the same radius in each of the hoop-shaped reinforcing ribs to form a plurality of hoop-shaped reinforcing ribs comprises:

[0025] In each of the hoop-shaped reinforcing ribs, the hoop-shaped reinforcing ribs with the same radius are connected one by one, so that each of the hoop-shaped reinforcing ribs with the same radius can form a hoop-shaped reinforcing rib.

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

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

[0028] The present application relates to a nuclear power reactor plant outer dome and a method for installing the same, wherein the steel mold is divided into steel mold units in a factory, and the steel mold units are assembled into a complete steel mold on site, and then the complete steel mold is hoisted to the top of the corresponding reactor plant, without the need to set up a scaffold on the inner dome, thereby greatly simplifying the construction process, saving a large amount of time and human resources, and improving the construction efficiency.

[0029] In addition, the steel mold (composed of steel mold units) of the present application is installed and disassembled externally, without the need for workers to enter the space between the inner and outer domes, thereby greatly improving the safety of the construction process.

[0030] In addition, the split arrangement of the steel mold units also improves the safety during transportation and installation, ensuring the safety and controllability of the entire construction process. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to the like elements throughout the drawings, and in which:

[0032] Figure 1is a structural diagram of installing the nuclear power reactor plant outer dome to a predetermined position in some embodiments of the present application;

[0033] Figure 2 is a structural diagram of the nuclear power reactor plant outer dome in some embodiments of the present application;

[0034] Figure 3 is a structural diagram of the nuclear power reactor plant outer dome shown from another angle; Figure 2

[0035] Figure 4 is an explosion diagram of the nuclear power reactor plant outer dome in some embodiments of the present application;

[0036] Figure 5 is a flow chart of the installation method of the nuclear power reactor plant outer dome in some embodiments of the present application;

[0037] Figure 6 is a structural diagram of the nuclear power reactor plant outer dome in some other embodiments of the present application. DETAILED DESCRIPTION

[0038] Embodiments of the present application will be described in more detail with reference to the drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be embodied in various forms without being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0039] It should be understood that although the terms "first", "second", "third", etc. can be employed in describing various information used in the present application, the information should not be limited to these terms. These terms are only used to distinguish one piece of information from another piece of information of the same type. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present application. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0040] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. ​

[0041] Unless otherwise clearly indicated and limited, the terms "mounting", "connecting", "connection", "fixing" and the like are to be construed broadly, for example, can be fixed connection, can also be detachable connection or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] Figure 1 The nuclear power reactor plant dome 10 in some embodiments of the present application is shown. As shown, the nuclear power reactor plant dome 10 comprises a plurality of steel form units 1, each steel form unit 1 comprises a plurality of radial ribs 12 and a plurality of circumferential ribs 11, one end of each radial rib 12 is connected to each other to form a center end 13 of the steel form unit 1, the other end of each radial rib 12 forms a peripheral end 14 of the steel form unit 1, each radial rib 12 is arranged at equal angles, each circumferential rib 11 is connected to each radial rib 12, and the radius of each circumferential rib 11 gradually increases away from the center end 13. Figures 1 to 4

[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, the same radius of each circumferential rib 11 is connected end to end to form a plurality of annular ribs 4 around the dome center 2, and each steel form unit 1 together constitutes a dome steel form 20. The dome steel form 20 is provided with a plurality of lifting points 30 for lifting the dome steel form 20 as a whole.

[0044] It can be understood that the circumferential rib 11 is used to enhance the lateral stability of the steel form unit 1, and to ensure the structural strength during hoisting and use. The circumferential rib 11 is uniformly distributed along the arc surface of the steel form unit 1, which increases the overall stiffness of the steel form unit 1.

[0045] The one end of the radial rib 12 is connected to each other to form the center end 13 of the steel form unit 1, and the other end forms the peripheral end 14 of the steel form unit 1. The radial rib 12 is arranged at equal angles to uniformly distribute the stress and ensure the overall stiffness and stability of the steel form unit 1.

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

[0047] ​The peripheral end 14 is formed by the other end of each radial reinforcing rib 12 and is the edge portion of the steel mold unit 1. The peripheral end 14 ensures that each steel mold unit 1 can form a complete circular perimeter during assembly.

[0048] like Figures 1 to 4 As shown, in some embodiments of the dome 10 outside the 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 center end 13, and the other end of each radial reinforcing rib 12 and the end of each radial main reinforcing rib 121 together form the peripheral end 14.

[0050] Understandably, the radial main reinforcing rib 121 bears the main supporting and reinforcing role. One end of the radial main reinforcing rib 121 is connected to one end of other radial main reinforcing ribs 121 to form a central end 13, and the other end is connected to 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 formwork unit 1 during hoisting and use.

[0051] The radial secondary stiffeners 122 are used to further enhance the local stiffness and stability of the steel mold unit 1. The arrangement of the radial secondary stiffeners 122 enables the steel mold unit 1 to better distribute stress when under load, avoiding local stress concentration.

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

[0053] Understandably, the thirty radial main reinforcing ribs 121 are arranged at equal angular intervals, enabling the steel formwork unit 1 to withstand larger loads during hoisting and use, thus preventing deformation and damage. This equal angular interval arrangement also ensures uniform stress distribution, improving the safety and reliability of the overall structure.

[0054] like Figures 1 to 4 As shown, in some embodiments of the dome 10 outside the nuclear power reactor building, each radial reinforcing rib 12 includes ninety radial secondary reinforcing ribs 122, which are arranged at equal angular intervals.

[0055] It can be understood that the radial secondary reinforcing ribs 122 are also equiangularly spaced. One end of each radial secondary reinforcing rib 122 is directed towards the central end 13, and the other end is connected to the end of the radial primary reinforcing rib 121 to form the peripheral end 14. The arrangement of the radial secondary reinforcing ribs 122 further enhances the local rigidity and stability of the steel formwork unit 1, disperses stress, and avoids local stress concentration.

[0056] Specifically, as shown in Figures 1 to 4 the radial primary reinforcing rib 121 comprises a primary reinforcing angle steel, the first side of the primary reinforcing angle steel is 200mm wide, the second side of the primary reinforcing angle steel is 125mm wide, and the thickness of the primary reinforcing angle steel is 12mm. It should be noted that this size of the primary reinforcing angle steel ensures that the radial primary reinforcing rib 121 has sufficient strength and rigidity to withstand large loads during lifting and use, and avoids deformation and damage.

[0057] Specifically, as shown in Figures 1 to 4 the radial secondary reinforcing rib 122 comprises a secondary reinforcing angle steel, the first side of the secondary reinforcing angle steel is 75mm wide, the second side of the secondary reinforcing angle steel is 50mm wide, and the thickness of the secondary reinforcing angle steel is 8mm. It should be noted that this size of the secondary reinforcing angle steel ensures that the radial primary reinforcing rib 121 has sufficient strength and rigidity to withstand large loads during lifting and use, and avoids deformation and damage.

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

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

[0060] Further, as shown in Figures 1 to 4 each annular reinforcing rib 4 comprises an annular reinforcing angle steel, the first side of the annular reinforcing angle steel is 200mm wide, the second side of each annular reinforcing angle steel is 125mm wide, and the thickness of each annular reinforcing angle steel is 12mm. It should be noted that this size of the annular reinforcing angle steel ensures that the radial primary reinforcing rib 121 has sufficient strength and rigidity to withstand large loads during lifting and use, and avoids deformation and damage.

[0061] The present application also provides a method for installing a nuclear power reactor plant outer dome, comprising:

[0062] Obtain each steel formwork unit of the nuclear power reactor plant outer dome of the present application. It can be understood that each steel formwork unit 1 comprises a plurality of circumferential reinforcing ribs 11 and a plurality of radial reinforcing ribs 12.

[0063] The central ends of each steel formwork unit are connected to form the center of the dome. The peripheral ends of each steel formwork unit are connected one by one around the center of the dome to form the perimeter of the dome. The parts with the same radius in each circumferential reinforcing rib are connected to form several annular reinforcing ribs. In this way, the steel formwork units are combined to form the dome steel formwork.

[0064] Several lifting points are set on the dome steel formwork, and each lifting point is connected to a lifting device. The dome steel formwork is then hoisted to the predetermined installation position using the lifting device. Understandably, the number and specific location of the lifting points can be flexibly set, with the preferred method being to ensure stable lifting of the dome steel formwork.

[0065] Concrete is poured into the dome steel formwork. Understandably, after steel formwork unit 1 is fixed, the reinforcing bars are tied. Then, concrete is poured. After pouring, steel formwork unit 1 serves as a permanent, non-removable steel lining for the outer dome concrete structure and does not need to be removed.

[0066] It should be noted that, in the factory, the steel mold unit 1 is prefabricated in sections according to the design drawings. Each steel mold unit 1 is equipped with circumferential reinforcing ribs 11 and radial reinforcing ribs 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 area. During the assembly process, ensure that the center ends 13 of each steel formwork unit 1 are connected to each other to form the dome center 2. At the same time, connect the peripheral ends 14 of each steel formwork unit 1 around the dome center 2 one by one to form the dome perimeter 3.

[0068] Multiple lifting points 30 are set on the dome steel formwork 20 to ensure uniform stress distribution during hoisting and avoid localized stress concentration. The positions of the lifting points 30 should be calculated and designed to ensure the safety and reliability of the hoisting process.

[0069] During the pouring process, it is important to ensure the uniform distribution and density of the concrete.

[0070] like Figures 1 to 5 As shown, in some embodiments of the installation method for the dome outside the nuclear power reactor building, connecting the center ends of each steel formwork unit to form the dome center includes: welding the center ends together after they are brought close together, so that the center ends together form the dome center.

[0071] Understandably, the center ends 13 of each steel formwork unit 1 are brought close together and held against each other. Ensure that the contact surfaces of each center end 13 are flat and tightly fitted to facilitate subsequent welding operations. Use welding equipment to weld the center ends 13 together. During welding, ensure the quality and strength of the weld, avoid incomplete welds or discontinuous welds, and ensure that each center end 13 is firmly connected together to 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 installation method for the dome outside a nuclear power reactor building, connecting the portions of each circumferential reinforcing rib with the same radius to form several annular reinforcing ribs includes: connecting the circumferential reinforcing ribs with the same radius one by one in each circumferential reinforcing rib, so that each portion of the circumferential reinforcing rib with the same radius can form an annular reinforcing rib.

[0073] Understandably, after each steel mold unit 1 is correctly assembled, the circumferential reinforcing ribs 11 on each steel mold unit 1 will be aligned with each other, and each circumferential reinforcing rib 11 will be aligned with the circumferential reinforcing ribs 11 of the same radius on the other steel mold units 1. Using welding equipment or other connection methods, the circumferential reinforcing ribs 11 of the same radius are connected end to end to form a complete annular reinforcing rib 4.

[0074] like Figures 1 to 5 As shown, in some embodiments of the installation method for the dome outside the nuclear power reactor building, the contact points of every two adjacent steel formwork units are welded together.

[0075] Understandably, it is essential to ensure the contact surfaces are smooth and free of impurities to guarantee weld quality. Welding should begin from one end of the contact point and proceed segment by segment to ensure weld continuity and strength. After welding is completed, visual inspection and necessary non-destructive testing of the weld should be performed to ensure its quality and integrity.

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

[0077] Understandably, one of the steel formwork units 1 is located at the center of the dome steel formwork and has a dome center 2. The other steel formwork units 1 that are not in the center are spliced ​​together one by one around the outer periphery of the steel formwork unit 1 in the center position, so that the complete dome steel formwork 20 can be directly assembled on the construction site and then the dome steel formwork 20 can be hoisted to the predetermined installation position.

[0078] It should be noted that on one dome steel mold 20, the shape profile of each steel mold unit 1 can be flexibly set according to actual construction needs, as long as it can be assembled and connected into the required dome steel mold 20 on site. For example Figure 6 As shown in the figure, the dome steel mold 2 can be divided into several steel mold units 1 along Figure 6 The dashed line in the figure. Figure 4 As shown in the figure.

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

[0080] The present application relates to a kind of nuclear power reactor plant outer dome and its installation method, in the nuclear power reactor plant outer dome, on the one hand, steel mold is divided into each steel mold unit in factory prefabrication, after transportation to site, after each steel mold unit is assembled into complete steel mold on site, steel mold is hoisted to the top of corresponding reactor plant as a whole, without setting up scaffold on inner dome, so as to greatly simplify construction process, save a lot of time and human resources, improve construction efficiency.

[0081] On the other hand, each steel mold of the present application is directly hoisted after being assembled on site, without setting up scaffold for supporting outer dome outside inner dome, effectively shortening construction period, and accelerating engineering progress.

[0082] In addition, the installation and disassembly process of the steel mold (composed of each steel mold unit) of the present application are all operated externally, without the need for workers to enter the space between the narrow and relatively closed inner and outer domes, greatly improving the safety of the construction process. In addition, the split setting of steel mold unit also improves the safety during transportation and installation, ensuring the safety and controllability of the entire construction process.

[0083] The scheme of the present application has been described in detail above with reference to the drawings. In the above examples, the description of each example has its own emphasis, and the parts not described in detail in a certain example can be referred to the related description of other examples. It should be known by those skilled in the art that the actions and modules involved in the specification are not necessarily required by the present application. In addition, it can be understood that the steps in the method of the present application embodiment can be adjusted, combined and reduced in sequence according to actual needs, and the modules in the device of the present application embodiment can be combined, divided and reduced according to actual needs.

[0084] Having described various embodiments of the application, it is to be understood that the above description is meant to be illustrative only and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art, without departing from the scope and spirit of the described embodiments. The choice of words in this document is intended to best explain the principles of the embodiments, the practical application, or improvement over the technology in the art, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A nuclear power reactor building exterior dome, characterized in that, include: A plurality of steel mold units, each of the steel mold units including a plurality of circumferential reinforcing ribs and a plurality of radial reinforcing ribs, one end of each radial reinforcing rib being connected to each other to form the center end of the steel mold unit, the other end of each radial reinforcing rib forming the peripheral end of the steel mold unit, the radial reinforcing ribs being arranged at equal angular intervals, each circumferential reinforcing rib being connected to each radial reinforcing rib, and the radius of each circumferential reinforcing rib gradually increasing in the direction away from the center end; The central ends of each of the above are connected to form the center of the dome, and the peripheral ends of each of the above are arranged around the center of the dome to form the periphery of the dome. The parts of each of the circumferential reinforcing ribs with the same radius are connected end to end around the center of the dome to form several annular reinforcing ribs. The steel mold units together form the dome steel mold. The dome steel mold is provided with several lifting points for lifting the dome steel mold as a whole. Each of the radial reinforcing ribs includes a plurality of radial main reinforcing ribs and a plurality of radial secondary reinforcing ribs; On the dome steel formwork, each of the radial reinforcing ribs includes thirty radial main reinforcing ribs, and the radial main reinforcing ribs are arranged at equal angular intervals. Each of the radial reinforcing ribs includes ninety radial secondary reinforcing ribs, and the radial secondary reinforcing ribs are arranged at equal angular intervals; The portions of each circumferential reinforcing rib with the same radius are connected end to end, thereby forming nine annular reinforcing ribs.

2. The nuclear power reactor building exterior dome according to claim 1, characterized in that, One end of each of the radial reinforcing ribs is connected to form the central end; One end of each of the radial secondary reinforcing ribs faces the center end, and the other end of each of the radial secondary reinforcing ribs together with the end of each of the radial primary reinforcing ribs forms the peripheral end.

3. The nuclear power reactor building exterior dome according to claim 1 or 2, characterized in that, The radial main reinforcing rib includes a main reinforcing angle steel, wherein the first side width of the main reinforcing angle steel is 200mm, the second side width of the main reinforcing angle steel is 125mm, and the thickness of the main reinforcing angle steel is 12mm; and / or The radial secondary reinforcing rib includes a secondary reinforcing angle steel, wherein the first side width of the secondary reinforcing angle steel is 75mm, the second side width of the secondary reinforcing angle steel is 50mm, and the thickness of the secondary reinforcing angle steel is 8mm.

4. The nuclear power reactor building exterior dome according to claim 1, characterized in that, On the dome steel mold, Each of the aforementioned annular reinforcing ribs includes annular reinforcing angle steel, wherein the first side width of the annular reinforcing angle steel is 200mm, the second side width of each of the aforementioned annular reinforcing angle steels is 125mm, and the thickness of each of the aforementioned annular reinforcing angle steels is 12mm.

5. A method for installing the external dome of a nuclear power reactor building, characterized in that, include: Obtain each of the steel mold units as described in any one of claims 1 to 4; 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 around the center of the dome to form the periphery of the dome. The parts with the same radius in each circumferential reinforcing rib are connected to form several circumferential reinforcing ribs. Thus, each steel mold unit forms a dome steel mold. A number of lifting points are set on the dome steel formwork, and each lifting point is connected to a lifting device. The dome steel formwork is then lifted to the predetermined installation position by the lifting device. Concrete was poured into the dome steel mold.

6. The method for installing the external dome of a nuclear power reactor building according to claim 5, characterized in that, The step of connecting the center ends of each of the steel mold units to form the dome center includes: The central ends are brought close together and then welded together, so that the central ends together form the center of the dome.

7. The method for installing the external dome of a nuclear power reactor building according to claim 5, characterized in that, The step of connecting the portions of each circumferential reinforcing rib with the same radius to form a plurality of circumferential reinforcing ribs includes: In each of the circumferential reinforcing ribs, circumferential reinforcing ribs with the same radius are connected one by one, so that each part of the circumferential reinforcing ribs with the same radius can form a corresponding annular reinforcing rib.

8. The method for installing the external dome of a nuclear power reactor building according to claim 5, characterized in that, The contact points of every two adjacent steel mold units are welded together.

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