Ultra-high performance concrete precast component, modular containment and method of manufacture

Abstract

The application discloses a kind of super high performance concrete prefabricated components, for building nuclear power plant containment, prefabricated component is the block structure with thickness, block structure includes first facade and second facade, first facade and second facade are arc surface;Further include multiple outer edge surfaces, multiple outer edge surfaces connect first facade and second facade, at least two outer edge surfaces are provided with mounting slot, mounting slot extends in the direction perpendicular to thickness direction;Limiting portion is equipped in mounting slot, the extension direction of limiting portion is consistent with the extension direction of mounting slot.The prefabricated component material is super high performance concrete, has excellent tensile load capacity and impact resistance and explosion resistance.

Description

Technical Field

[0001] This invention relates to the field of nuclear power structure engineering technology, and more specifically, to an ultra-high performance precast concrete component, a modular containment structure, and a manufacturing method thereof. Background Technology

[0002] The containment vessel is the third and final barrier in a nuclear power plant to prevent the leakage of radioactive materials. The containment vessel must be designed to withstand the pressure and temperature loads under primary circuit accident conditions, maintaining excellent sealing; it must also be able to safely withstand extreme external events such as aircraft impacts, ensuring that internal nuclear-grade piping and equipment remain unaffected. This requires the containment vessel to have good tensile strength and resistance to impact and blast.

[0003] Currently, domestic nuclear power plants mainly adopt a typical double-layer containment structure, consisting of a prestressed reinforced concrete structure and a reinforced concrete structure. The inner and outer containment layers are independent of each other. The inner prestressed reinforced concrete containment layer is used to withstand pressure and temperature loads under severe accidents, ensuring effective containment of radioactive materials; the outer reinforced concrete containment layer is used to withstand extreme external events such as aircraft impacts, ensuring that internal nuclear-grade piping and equipment are unaffected. The construction process for the double-layer prestressed containment structure is complex, and the large size and weight of the double containment layer result in a slow construction process, significantly delaying the construction period and increasing project costs.

[0004] With the development of new reactor types and the introduction of higher design requirements, traditional double-containment structure design methods are gradually becoming limited. For example, in the development of microreactors or mobile reactors, there are requirements for lightweight structures that are not only compact, thin, and lightweight, but also provide good protection against extreme loads such as external impact explosions. Other requirements, such as modular rapid assembly and new power plant designs with a service life of over 80 years, also place new demands on the traditional double-containment structure design.

[0005] To address the above issues, existing patent CN108766595A utilizes the restraining effect of externally prestressed tendons and the thermal expansion and contraction characteristics of steel structures to transform the traditional prestressed concrete containment structure into a steel-concrete composite containment structure. Prestressed tendons are arranged on both the inner and outer sides of the composite containment structure, proposing an externally prestressed steel-concrete composite containment structure. Patent CN108630326B applies the waste heat removal technology of the filled water column and modular assembly technology to propose a novel steel-concrete composite containment structure with passive heat conduction function.

[0006] With the development of materials technology, ultra-high performance concrete (UHPC), a new type of cement-based composite material that emerged in the late 20th century, possesses excellent properties such as ultra-high strength, high toughness, and high durability. Compared with ordinary cement-based materials, UHPC exhibits better compressive strength, tensile strength, flexural strength, and impact and blast resistance. Using UHPC to construct containment structures allows them to simultaneously possess excellent tensile and impact / blast resistance, enabling them to function as both inner and outer containment layers. Ultimately, the inner and outer containment layers can be combined into a single single-layer structure, significantly reducing the volume and weight of the containment. Furthermore, fully utilizing the tensile properties of UHPC eliminates the need for prestressing systems, and modular construction techniques can shorten the containment construction cycle, significantly improving the economics of nuclear power plants.

[0007] Patent CN111561194B proposes using ultra-high performance concrete (UHVPC) as a substitute for ordinary concrete in containment structures, forming an integral structure with a single-sided steel plate. It describes a single-layer UHVPC containment structure with a single-sided steel plate and its construction method. In summary, currently applied patents mainly focus on steel-concrete composite containment structures; there are no reports on constructing containment structures using a single UHVPC material. Furthermore, the performance of UHVPC requires stringent curing conditions, and construction sites often lack the high-temperature, pressure-curing conditions found in laboratories. Using prefabricated UHVPC components in factories and achieving modular construction of the containment through modular design is crucial for ensuring the performance and quality of UHVPC, the safety of the containment under accident conditions, and further improving the construction efficiency and economy of the containment.

[0008] In view of the above technical problems, this invention is hereby introduced. Summary of the Invention

[0009] The main objective of this invention is to provide an ultra-high performance precast concrete component, a modular containment structure, and a manufacturing method that eliminates the prestressing system of prestressed concrete containment structures, thereby solving the problems of large volume and weight, high construction difficulty, and long construction period of existing containment structures.

[0010] To achieve the above objectives, according to one aspect of the present invention, an ultra-high performance precast concrete component is provided for constructing a nuclear power plant containment structure. The precast component is a block structure with thickness. Further, the block structure includes a first facade and a second facade, the first facade and the second facade being arc-shaped surfaces; it also includes multiple outer edge surfaces, the multiple outer edge surfaces connecting the first facade and the second facade, and at least two outer edge surfaces having mounting grooves extending in a direction perpendicular to the thickness; a limiting portion is provided within the mounting groove, the extending direction of the limiting portion being consistent with the extending direction of the mounting groove.

[0011] Furthermore, the limiting part is a limiting groove, which is located at the bottom of the mounting groove.

[0012] Furthermore, the mounting groove includes a first groove portion and a second groove portion. Along the depth direction of the mounting groove, the first groove portion, the second groove portion, and the limiting groove are arranged in sequence and interconnected to form the mounting groove.

[0013] Furthermore, along the thickness direction of the precast component, the width of the second groove is greater than that of the first groove, and the width of the first groove is greater than that of the limiting groove.

[0014] Furthermore, on the cross-section of the prefabricated component, the first groove, the second groove, and the limiting groove are symmetrical structures and the lines of symmetry are on a straight line.

[0015] Furthermore, the prefabricated component also includes multiple through holes that pass through the first facade and the second facade. The multiple through holes are located on the edges of the first facade and the second facade near the outer edge and are distributed circumferentially along the edges of the first facade and the second facade.

[0016] Furthermore, the through hole includes a first through hole and a second through hole. The second through hole is located on the side away from the outer edge surface relative to the first through hole. The first through hole passes through the mounting groove and / or the first through hole passes through the second recess.

[0017] Furthermore, the prefabricated component includes multiple embedded strips, which are respectively embedded on the surfaces of the first facade and the second facade, and the extension direction of the multiple embedded strips is parallel to the outer edge surface. Relative to the second through hole, the embedded strips are located on the side away from the outer edge surface.

[0018] To achieve the above objectives, according to another aspect of the present invention, a modular containment structure for a nuclear power plant is proposed, comprising a cylindrical body and a hemispherical dome, wherein the body and the dome include prefabricated components, the prefabricated components are spliced ​​together in a staggered manner, and a first connector is provided at the splice between the prefabricated components, the first connector connecting the outer edges of two adjacent prefabricated components, and a plurality of first connectors are connected to form a first frame structure.

[0019] Furthermore, the containment also includes second connectors that connect the first facade and / or second facade of two adjacent prefabricated components, and multiple second connectors are connected to form a second frame structure.

[0020] Furthermore, the edge of the second connector is at least partially covered by the embedded strip, and the second frame structure is welded to the embedded strip as a whole.

[0021] Furthermore, the prefabricated components include first prefabricated components and second prefabricated components, the cylinder includes multiple first prefabricated components, the multiple first prefabricated components are spliced ​​together in a staggered manner, and the dome includes multiple second prefabricated components and an arc-shaped top cover, the multiple second prefabricated components are spliced ​​together in a staggered manner and spliced ​​with the arc-shaped top cover.

[0022] Furthermore, the arc-shaped top cover is made of ultra-high performance concrete, including an installation groove and a reserved grouting hole. The installation groove is located at the joint between the arc-shaped top cover and the second precast component.

[0023] Furthermore, the first prefabricated component has a rectangular cross-section, and the second prefabricated component has a trapezoidal cross-section.

[0024] Furthermore, the splicing of the outer edges of adjacent prefabricated components allows the mounting slots to connect and form an installation space, with the first connector located within the installation space and extending along the extension direction of the mounting slot.

[0025] Furthermore, the first connecting member includes a limiting part and a web part, the web part being connected to the limiting parts located at both ends, and the limiting parts being engaged in the limiting grooves within the mounting grooves.

[0026] Furthermore, the installation space also includes a filling section that fills all the space within the installation space except for the first connector. The filling material is ultra-high performance concrete.

[0027] Furthermore, a web through hole is provided on the web portion, and the web through hole and the first through hole are located on a straight line.

[0028] Furthermore, the web portion includes a web body, horizontal stiffeners, and vertical stiffeners, which are fixedly connected to the surface of the web body and are perpendicular to each other.

[0029] Furthermore, the second connector is located on the surface of the first facade and / or the second facade splicing position of the adjacent precast component, and the second connector has fastener holes, through which the second connector is connected to the precast component by fasteners.

[0030] Furthermore, the second connector has connecting plate stiffening ribs on its surface, and the connecting plate stiffening ribs are mutually perpendicular.

[0031] To achieve the above objectives, according to another aspect of the present invention, a method for manufacturing a modular containment structure for a nuclear power plant is provided, wherein the assembly of prefabricated components includes the following steps:

[0032] S1, when splicing adjacent prefabricated components, the two ends of the first connector are engaged into the limiting groove;

[0033] S2, When splicing multiple prefabricated components in a staggered manner, the multiple first connectors are welded together at the same time;

[0034] S3, install a second connector on the surface on both sides of the splicing position of the adjacent precast components, pass multiple fasteners through the second connector and the precast components, and tighten all fasteners;

[0035] S4, fill the installation space with cast-in-place ultra-high performance concrete to form a filling section;

[0036] S5, weld the second connector to the embedded strip, and connect multiple second connectors together by welding.

[0037] By applying the technical solution of this invention, at least the following beneficial effects are achieved:

[0038] 1. The containment structure of this application is constructed by splicing precast components made of ultra-high performance concrete, which fully utilizes the advantages of ultra-high performance concrete in terms of its good impact and blast resistance, thereby improving the containment structure's ability to withstand extreme external events such as aircraft impacts. Furthermore, ultra-high performance concrete itself has excellent tensile bearing capacity, which improves the ultimate bearing capacity of the containment structure under severe accident conditions.

[0039] 2. The containment structure of this application adopts modular construction technology and makes full use of the extremely strong tensile bearing capacity of ultra-high performance concrete, which can eliminate the prestressing system, thereby greatly reducing the construction difficulty, shortening the construction cycle of the containment structure, and significantly improving economic benefits.

[0040] 3. The containment structure of this application, with only one layer of prefabricated components, changes the traditional double-layer containment structure, greatly reducing the volume and weight of the containment, and is conducive to promoting the research and development of new reactor types such as micro reactors and mobile reactors.

[0041] 4. The containment structure of this application significantly improves the overall strength of the containment structure by setting a first connector and a second connector, welding adjacent first connectors and second connectors into an integral frame structure, and welding the second connector to the embedded strip, and can play a role in preventing the leakage of radioactive materials.

[0042] 5. The containment structure of this application improves the tensile bearing capacity of the containment structure by setting installation grooves and filling parts between adjacent precast components. The ultra-high performance concrete cast in the filling part tightly connects the precast components, and the installation groove eliminates the need for cast-in-place formwork when casting joints.

[0043] 6. Ultra-high performance concrete has high density and strong corrosion resistance, which can greatly improve the service life of the containment vessel in the salt spray environment at the seaside. Attached Figure Description

[0044] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0045] Figure 1 A schematic diagram of the containment structure according to an embodiment of the present invention is shown;

[0046] Figure 2 A schematic diagram of the first prefabricated component according to an embodiment of the present invention is shown;

[0047] Figure 3 A schematic diagram of the second prefabricated component according to an embodiment of the present invention is shown;

[0048] Figure 4 A cross-sectional view of a first prefabricated component according to an embodiment of the present invention is shown;

[0049] Figure 5 A longitudinal section sectional view of a prefabricated component according to an embodiment of the present invention is shown;

[0050] Figure 6 A schematic diagram of the mounting slot according to an embodiment of the present invention is shown;

[0051] Figure 7 A front view of a prefabricated component according to an embodiment of the present invention is shown;

[0052] Figure 8 A schematic diagram of staggered splicing of prefabricated components according to an embodiment of the present invention is shown;

[0053] Figure 9 A cross-sectional view of the splicing position of adjacent prefabricated components according to an embodiment of the present invention is shown;

[0054] Figure 10 A schematic diagram of the first frame structure according to an embodiment of the present invention is shown;

[0055] Figure 11 A schematic diagram of the second frame structure according to an embodiment of the present invention is shown;

[0056] Figure 12 A schematic diagram of the arc-shaped top cover according to an embodiment of the present invention is shown;

[0057] Figure 13 A schematic diagram of the pre-reserved grouting hole in the arc-shaped top cover according to an embodiment of the present invention is shown.

[0058] The above figures include the following reference numerals:

[0059] 1. Cylinder body; 2. Dome; 3. First connector; 31. Limiting part; 32. Web plate; 33. Web plate through hole; 34. Horizontal stiffening rib; 35. Vertical stiffening rib; 36. Web plate body; 4. Second connector; 41. Fastener hole; 42. Connecting plate stiffening rib; 5. Filling part; 6. Fastener; 61. First fastener; 62. Second fastener; 7. First prefabricated component; 8. Second prefabricated component; 9. Arc-shaped top cover; 91. Reserved grouting hole; 10. Containment foundation; 11. First elevation; 12. Second elevation; 13. Outer edge; 14. Mounting groove; 15. Limiting groove; 16. First groove; 17. Second groove; 18. Through hole; 19. First through hole; 20. Second through hole; 21. Embedded strip. Detailed Implementation

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0061] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features. The terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0063] Example:

[0064] The problem this invention aims to solve in light of existing technologies is to provide a modular design of a containment structure using a single ultra-high performance concrete material. By leveraging the excellent tensile strength, blast resistance, and impact resistance of ultra-high performance concrete, the prestressing system can be eliminated.

[0065] like Figure 1 As shown, this application proposes a modular containment structure for a nuclear power plant, comprising a cylindrical shell 1 and a hemispherical dome 2, with the shell 1 built on a containment foundation 10. The containment structure is mainly composed of prefabricated components. The shell 1 includes multiple first prefabricated components 7, which are staggered and spliced ​​together. The dome 2 includes multiple second prefabricated components 8 and an arc-shaped top cover 9, with the second prefabricated components 8 staggered and spliced ​​together with the arc-shaped top cover 9.

[0066] Specifically, both the first precast component 7 and the second precast component 8 are prefabricated and used to construct the containment vessel of the nuclear power plant; their main material is ultra-high performance concrete. For example... Figure 2 As shown, the cross-section of the first prefabricated component 7 is rectangular; as Figure 3 As shown, the cross-section of the second prefabricated component 8 is trapezoidal.

[0067] The containment structure of this application utilizes ultra-high performance concrete materials and is designed with prefabricated components. It can meet the strength requirements of the project with a single-layer containment structure, which changes the traditional double-layer containment structure, greatly reduces the volume and weight of the containment structure, and is conducive to promoting the research and development of new reactor types such as microreactors and mobile reactors.

[0068] Combination Figure 2 and Figure 3 As shown, the prefabricated component proposed in this application is a block structure with thickness. In this embodiment, it is a hexahedral shape as shown in the figure, including a first facade 11 and a second facade 12. The first facade 11 and the second facade 12 are curved surfaces, and the first facade 11 is an outer curved surface. This application does not limit the specific shape of the prefabricated component block structure. The first facade 11 and the second facade 12 can also be other quadrilaterals, triangles, pentagons, hexagons, or other shapes.

[0069] The precast component also includes multiple outer edge surfaces 13, which connect the first facade 11 and the second facade 12. At least two outer edge surfaces 13 have mounting grooves 14 extending perpendicular to the thickness direction. Each mounting groove 14 has a limiting portion extending in the same direction as the mounting groove 14. Preferably, each outer edge surface has both a mounting groove and a limiting portion, and the mounting groove and limiting portion are continuous on the outer edge of the precast component.

[0070] Combination Figure 4-6As shown, the limiting part is a limiting groove 15, which is located at the bottom of the mounting groove 14 and is used to install the first connector 3. In other embodiments of this application, the limiting part may also adopt a limiting boss or other structure. The mounting groove 14 also includes a first groove 16 and a second groove 17. Along the depth direction of the mounting groove 14, the first groove 16, the second groove 17 and the limiting groove 15 are arranged sequentially and communicate with each other to form the mounting groove 14.

[0071] Specifically, along the thickness direction of the precast component, the width of the second groove 17 is greater than that of the first groove 16, and the width of the first groove 16 is greater than that of the limiting groove 15. In the cross-section of the precast component, the first groove 16, the second groove 17, and the limiting groove 15 are symmetrical structures and the line of symmetry is on a straight line.

[0072] In addition, the prefabricated component also includes a plurality of through holes 18, which pass through the first facade 11 and the second facade 12, and the plurality of through holes 18 are located on the first facade 11 and the second facade 12 near the edge of the outer edge surface 13.

[0073] Specifically, the through hole 18 includes a first through hole 19 and a second through hole 20, with the first through hole 19 passing through the mounting groove 14. Preferably, the first through hole 19 passes through the second recess 17. The second through hole 20 is located on the side away from the outer edge surface 13, relative to the first through hole 19. The first through hole 19 and the second through hole 20 are used to install the second fastener 62 and the first fastener 61.

[0074] Combination Figure 7 As shown, the first through hole 19 is circumferentially distributed at the edges of the first facade 11 and the second facade 12, and the second through hole 20 is circumferentially distributed at the edges of the first facade 11 and the second facade 12, with the first through hole 19 located outside the second through hole 20.

[0075] like Figure 7 and Figure 8 As shown, the precast component also includes multiple embedded strips 21, which are respectively embedded on the surfaces of the first facade 11 and the second facade 12, and the extension direction of the multiple embedded strips is parallel to the outer edge surface. Relative to the second through hole 20, the embedded strips 21 are located on the side away from the outer edge surface 13. The material of the embedded strips 21 is steel, and each embedded steel strip is provided with an anchor bar. The embedded strips 21 are fastened to the ultra-high performance concrete of the precast component through the anchor bars.

[0076] Preferably, all prefabricated components except for the embedded strip 21 are made of ultra-high performance concrete. The containment structure of this application is constructed by assembling prefabricated components made of ultra-high performance concrete, fully utilizing the advantages of ultra-high performance concrete's excellent impact and blast resistance, thus improving the containment structure's ability to withstand extreme external events such as aircraft impacts. Furthermore, ultra-high performance concrete itself possesses excellent tensile bearing capacity, enhancing the ultimate bearing capacity of the containment structure under severe accident conditions. In addition, by employing modular construction technology and fully utilizing the extremely strong tensile bearing capacity of ultra-high performance concrete, the containment structure of this application can eliminate the need for a prestressed system, thereby significantly reducing construction difficulty, shortening the construction cycle of the containment structure, and significantly improving economic benefits.

[0077] like Figure 9 As shown, a first connector 3 and a second connector 4 are provided at the joints between adjacent prefabricated components.

[0078] The first connector 3 connects the outer edges 13 of two adjacent prefabricated components. The second connector 4 connects the first facade 11 and / or the second facade 12 of two adjacent prefabricated components. In this embodiment, preferably, multiple first connectors 3 in the containment are connected to form a first frame structure, and multiple second connectors 4 are connected to form a second frame structure.

[0079] The outer edges 13 of adjacent prefabricated components are spliced ​​together to connect the mounting grooves 14, forming an installation space. The first connector 3 is located within the installation space and extends along the extension direction of the mounting groove 14. Preferably, the first connector 3 is made of H-beams and comes in two types: straight and curved.

[0080] Specifically, the first connecting member 3 includes a limiting part 31 and a web part 32. The web part 32 is connected to the limiting parts 31 located at both ends, and the limiting parts 31 are engaged in the limiting grooves 15 within the mounting groove 14. The web part 32 is provided with a web through hole 33, which is aligned with the first through hole 19 to facilitate the passage of the second fastener 62. The web part 32 includes a web body 36, horizontal stiffening ribs 34, and vertical stiffening ribs 35. The horizontal stiffening ribs 34 and vertical stiffening ribs 35 are fixedly connected to the surface of the web body 36 and are perpendicular to each other. The horizontal stiffening ribs 34 and vertical stiffening ribs 35 improve the overall strength of the first connecting member 3.

[0081] The first connector 3 is installed in the installation space where adjacent prefabricated components are spliced, which effectively improves the bending and dislocation resistance of the containment structure and plays a role in preventing the leakage of radioactive materials at the splicing gap.

[0082] like Figure 9As shown, the installation space also includes a filling section 5, which fills all the space within the installation space except for the first connector 3. The filling material is ultra-high performance concrete. Specifically, after the precast component is assembled and the first connector 3 is inserted, ultra-high performance concrete is poured in place to form the filling section 5.

[0083] The containment structure of this application improves the tensile bearing capacity of the containment structure by setting installation grooves and filling parts between adjacent precast components. The ultra-high performance concrete cast in the filling parts tightly connects the precast components, and the installation grooves eliminate the need for cast-in-place formwork when casting joints.

[0084] like Figure 10 As shown, on the containment vessel, multiple first connectors 3 between prefabricated components are welded together to form a first frame structure.

[0085] like Figure 9 As shown, the second connector 4 is located on the surface of the splicing position of the first facade 11 and / or the second facade 12 of the adjacent precast components. The second connector 4 has fastener holes 41, and the second connector 4 is connected to the precast components by fasteners 6.

[0086] Preferably, the second connector 4 is located on both sides of the splicing position of the adjacent prefabricated components, and the fastener 6 passes through the fastener hole 41, the through hole 18 and the fastener hole 41 in sequence.

[0087] Specifically, fastener 6 includes a first fastener 61 and a second fastener 62. The first fastener 61 passes through the second through hole 20, and the second fastener 62 passes through the first through hole 19, the filler portion 5, and the web through hole 33. Preferably, the material of the second connector 4 is steel, and the second connector is a steel plate. The surface of the second connector 4 has connecting plate stiffening ribs 42, which are perpendicular to each other. The connecting plate stiffening ribs improve the strength of the second connector.

[0088] like Figure 11 As shown, on the containment structure, multiple second connectors 4 at the splicing locations of prefabricated components are welded together to form a second frame structure. Furthermore, the edges of the second connectors 4 at least partially cover the embedded strips 21, allowing for welding connections between the second frame structure and the embedded strips 21.

[0089] The containment structure of this application significantly improves the overall strength of the containment structure by setting a first connector and a second connector, welding adjacent first connectors and second connectors into an integral frame structure, and welding the second connector to the embedded strip. It can also play a role in preventing the leakage of radioactive materials.

[0090] like Figure 12As shown, the arc-shaped top cover 9 is made of ultra-high performance concrete and includes an installation groove 14 and a reserved grouting hole 91. The installation groove 14 is located at the joint between the arc-shaped top cover 9 and the second precast component 8. The joint method between the arc-shaped top cover 9 and the second precast component 8 located on the top layer of the dome 2 is basically the same as the joint method between the aforementioned precast components. The difference is that ultra-high performance concrete is poured in place between the arc-shaped top cover 9 and the second precast component 8 through the reserved grouting hole 91.

[0091] According to another aspect of the present invention, a method for manufacturing a modular containment structure for a nuclear power plant is provided, comprising the following steps during the assembly of prefabricated components:

[0092] S1, when splicing adjacent prefabricated components, the two ends of the first connector 3 are engaged into the limiting groove 15.

[0093] S2, when splicing multiple prefabricated components in a staggered manner, multiple first connectors 3 are welded together at the same time.

[0094] Preferably, during construction, multiple vertical straight first connectors can be welded to the curved first connectors of the next layer firstly. Then, the prefabricated components of the same layer are vertically inserted downwards between adjacent first connectors. Next, horizontal curved first connectors are placed and welded. The above steps are then repeated.

[0095] S3, install the second connector 4 on the surfaces on both sides of the splicing position of the adjacent prefabricated components, pass multiple first fasteners 61 and second fasteners 62 through the second connector 4 and the prefabricated components, and tighten all fasteners.

[0096] S4, fill the installation space with cast-in-place ultra-high performance concrete to form the filling part 5.

[0097] S5, the second connector 4 is welded to the embedded strip 21, and multiple second connectors 4 are connected by welding.

[0098] In summary, from the above description, it can be seen that the embodiments of the present invention achieve the following technical effects: 1. The containment vessel of this application is constructed by splicing prefabricated components made of ultra-high performance concrete, which fully utilizes the advantages of ultra-high performance concrete in terms of its excellent impact and blast resistance, improving the containment vessel's ability to withstand extreme external events such as aircraft impacts. Furthermore, ultra-high performance concrete itself has excellent tensile bearing capacity, improving the ultimate bearing capacity of the containment vessel under severe accident conditions. 2. The containment vessel of this application, by adopting modular construction technology and fully utilizing the extremely strong tensile bearing capacity of ultra-high performance concrete, can eliminate the prestressing system, thereby greatly reducing construction difficulty, shortening the construction cycle of the containment vessel, and significantly improving economic benefits. 3. The containment vessel of this application, through its structure of only one layer of prefabricated components, changes the traditional double-layer containment vessel structure, greatly reducing the volume and weight of the containment vessel, and is conducive to promoting the research and development of new reactor types such as microreactors and mobile reactors. 4. The containment structure of this application significantly improves its overall strength and prevents the leakage of radioactive materials by setting up a first connector and a second connector, welding adjacent first and second connectors into an integral frame structure, and welding the second connector to the embedded strip. 5. The containment structure of this application improves its tensile strength and prevents the leakage of radioactive materials by setting up installation grooves and filling sections between adjacent precast components. The ultra-high performance concrete cast in the filling section tightly connects the precast components, enhancing the tensile bearing capacity of the containment structure. Furthermore, the installation grooves eliminate the need for cast-in-place formwork for cast-in-place joints. 6. Ultra-high performance concrete has high density and strong corrosion resistance, which can greatly extend the service life of the containment structure in coastal salt spray environments.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A modular containment structure for a nuclear power plant, comprising a cylindrical shell (1) and a hemispherical dome (2), characterized in that: The cylinder (1) and the dome (2) include prefabricated components, which are spliced ​​together in a staggered manner. A first connector (3) is provided at the splice between the prefabricated components. The first connector (3) connects the outer edge surfaces (13) of two adjacent prefabricated components. A first frame structure is formed by connecting multiple first connectors (3). The outer edges (13) of adjacent prefabricated components are spliced ​​together to form an installation space by connecting the mounting grooves (14). The first connector (3) is located in the installation space and extends along the extension direction of the mounting groove (14). The installation space also includes a filling part (5), which fills the space in the installation space except for the first connector (3). The material of the filling part (5) is ultra-high performance concrete. The ultra-high performance concrete cast in the filling part (5) tightly connects the precast components. The prefabricated component is a block structure with thickness. The block structure includes a first facade (11) and a second facade (12), which are arc-shaped surfaces. It also includes multiple outer edge surfaces (13), which connect the first facade (11) and the second facade (12). At least two of the outer edge surfaces (13) are provided with mounting grooves (14), which extend in a direction perpendicular to the thickness. A limiting part is provided in the mounting groove (14), and the extending direction of the limiting part is consistent with the extending direction of the mounting groove (14).

2. The containment vessel according to claim 1, characterized in that: The limiting part is a limiting groove (15), which is located at the bottom of the mounting groove (14).

3. The containment vessel according to claim 2, characterized in that: The mounting groove (14) includes a first groove portion (16) and a second groove portion (17). Along the depth direction of the mounting groove (14), the first groove portion (16), the second groove portion (17) and the limiting groove (15) are arranged in sequence and connected to each other to form the mounting groove (14).

4. The containment vessel according to claim 3, characterized in that: Along the thickness direction of the prefabricated component, the width of the second groove (17) is greater than that of the first groove (16), and the width of the first groove (16) is greater than that of the limiting groove (15).

5. The containment vessel according to claim 4, characterized in that: On the cross-section of the prefabricated component, the first groove (16), the second groove (17) and the limiting groove (15) are symmetrical structures and the lines of symmetry are on a straight line.

6. The containment vessel according to any one of claims 3-5, characterized in that: The prefabricated component also includes a plurality of through holes (18) that pass through the first facade (11) and the second facade (12). The plurality of through holes (18) are located on the first facade (11) and the second facade (12) near the edge of the outer edge surface (13) and are distributed circumferentially along the edge of the first facade (11) and the second facade (12).

7. The containment vessel according to claim 6, characterized in that: The through hole (18) includes a first through hole (19) and a second through hole (20). The second through hole (20) is located on the side away from the outer edge surface (13) relative to the first through hole (19). The first through hole (19) passes through the mounting groove (14) and / or the first through hole (19) passes through the second recess (17).

8. The containment vessel according to claim 7, characterized in that: The prefabricated component also includes a plurality of embedded strips (21), which are respectively embedded on the surfaces of the first facade (11) and the second facade (12), and the extension direction of the plurality of embedded strips (21) is parallel to the outer edge surface. Relative to the second through hole (20), the embedded strips (21) are located on the side away from the outer edge surface (13).

9. The containment vessel according to claim 8, characterized in that: The containment structure also includes a second connector (4), which connects the first facade (11) and / or the second facade (12) of two adjacent prefabricated components, and the multiple second connectors (4) are connected to form a second frame structure.

10. The containment vessel according to claim 9, characterized in that: The edge of the second connector (4) is at least partially covered by the embedded strip (21), and the second frame structure is welded to the embedded strip (21) as a whole.

11. The containment vessel according to claim 10, characterized in that: The prefabricated components include a first prefabricated component (7) and a second prefabricated component (8). The cylinder (1) includes a plurality of first prefabricated components (7), which are spliced ​​together in a staggered manner. The dome (2) includes a plurality of second prefabricated components (8) and an arc-shaped top cover (9), which are spliced ​​together in a staggered manner and spliced ​​together with the arc-shaped top cover (9).

12. The containment vessel according to claim 11, characterized in that: The arc-shaped top cover (9) is made of ultra-high performance concrete and includes an installation groove (14) and a reserved grouting hole (91). The installation groove (14) is located at the joint between the arc-shaped top cover (9) and the second precast component (8).

13. The containment vessel according to claim 11, characterized in that: The first prefabricated component (7) has a rectangular cross section, and the second prefabricated component (8) has a trapezoidal cross section.

14. The containment vessel according to claim 13, characterized in that: The first connector (3) includes a limiting part (31) and a web part (32). The web part (32) is connected to the limiting part (31) located at both ends. The limiting part (31) is engaged in the limiting groove (15) in the mounting groove (14).

15. The containment vessel according to claim 14, characterized in that: The web portion (32) is provided with a web through hole (33), and the web through hole (33) and the first through hole (19) are located on a straight line.

16. The containment vessel according to claim 15, characterized in that: The web portion (32) includes a web body (36), horizontal stiffening ribs (34) and vertical stiffening ribs (35), which are fixedly connected to the surface of the web body (36) and perpendicular to each other.

17. The containment vessel according to claim 9, characterized in that: The second connector (4) is located on the surface of the first facade (11) and / or the second facade (12) of the adjacent precast component. The second connector (4) has a fastener hole (41) and is connected to the precast component by a fastener (6).

18. The containment vessel according to claim 17, characterized in that: The second connector (4) has connecting plate stiffening ribs (42) on its surface, and the connecting plate stiffening ribs (42) are mutually perpendicular.

19. A method for manufacturing a modular containment structure for a nuclear power plant according to any one of claims 7-18, characterized in that, The following steps are included when splicing prefabricated components: S1, when splicing adjacent prefabricated components, the two ends of the first connector (3) are engaged in the limiting groove (15); S2, when splicing multiple prefabricated components in a staggered manner, the multiple first connectors (3) are welded together at the same time; S3, install a second connector (4) on the surfaces on both sides of the splicing position of the adjacent prefabricated components, pass multiple fasteners (6) through the second connector (4) and the prefabricated components, and tighten all fasteners; S4, fill the installation space with cast-in-place ultra-high performance concrete to form a filling part (5). S5, the second connector (4) is welded to the embedded strip (21), and the multiple second connectors (4) are welded together.

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