Containment structure with composite protective layer and limiting pull and pressure support

Abstract

The utility model discloses a safety shell structure with composite protective layer and limit pull -press support, double -layer safety shell includes outer layer safety shell and inner layer safety shell, and outer layer safety shell is multilayer material composite structure, and from outside to inside includes surface layer, core layer and back layer in proper order, wherein surface layer is foamed metal material, and core layer is super high performance concrete layer, and back layer is non -prestressed concrete structure, prestressed concrete structure or steel structure, and inner layer safety shell is steel structure or steel - concrete combination structure with steel lining layer, and the bottom of the intercavum of negative pressure shell between outer layer safety shell and inner layer safety shell forms, and is sealed through the flexible connection of sealing ring, and is connected through swing device between double -layer safety shell and branch pier foundation, and swing device is vertical pull -press support. The utility model carries out the targeted design to outer layer safety shell structure, has three -fold anti -impact protection, and adopts the vertical pull -press support of combined limit at the bottom, improves the overall anti -seismic capacity, and the modular construction improves installation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of containment structures in nuclear power plants, and in particular, it is a containment structure with a composite protective layer and a limiting tension and compression support. Background Technology

[0002] Nuclear power plant safety has become a global concern. The containment structure design of nuclear power plants faces the following challenges when resisting extreme external loads: 1. The containment material is of a single type, resulting in poor impact resistance: Traditional containment structures use homogeneous concrete or pure steel. Concrete structures are brittle and prone to cracking under impact, while localized deformation of steel shells can easily lead to seal failure. To cope with sudden impact loads such as aircraft collisions, simply thickening the shell would result in a bulky and uneconomical overall containment structure.

[0003] II. The earthquake-resistant measures are simplistic and lack limiting protection: Traditional seismic-resistant structures used in nuclear power plants typically involve fixed seismic isolation measures between the superstructure and the foundation, providing only horizontal flexibility and unable to withstand vertical tensile and compressive forces. Furthermore, they lack combined limiting devices, resulting in a lack of emergency restraint mechanisms when supports deform excessively, thus posing a risk of structural overturning.

[0004] 3. The containment structure is designed as a complex, multi-layered nested structure: Arranging various energy-dissipating components between the layers of the containment structure creates a buffer effect between the inner and outer layers, and works in conjunction with the bottom seismic isolation components to resist earthquakes. However, this technology involves more equipment, increasing design difficulty, and also increases construction difficulty. Utility Model Content

[0005] The purpose of this invention is to provide a containment structure with a composite protective layer and limiting tension and compression supports, in order to solve the problems of existing nuclear power plant containment structures, such as single containment material with poor impact resistance, single shockproof measures and lack of limiting protection, as well as complex multi-layer nested structures, numerous equipment, and difficult construction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A containment structure with a composite protective layer and limiting tension / compression supports, including: A double-layered containment structure, consisting of an outer containment layer and an inner containment layer. The outer containment shell is an open or closed enclosure at the bottom. It is a multi-layered composite structure, consisting of a surface layer, a core layer, and a back layer from the outside in. The surface layer is made of foamed metal, the core layer is made of ultra-high performance concrete, and the back layer is a non-prestressed concrete structure, a prestressed concrete structure, or a steel structure. The inner containment structure is a bottom-sealed enclosure, made of steel or a steel-concrete composite structure with a steel lining, housing the nuclear reactor within the inner containment structure. A negative pressure inter-shell cavity is formed between the outer and inner containment layers. The bottom of the negative pressure inter-shell cavity is sealed by a sealing ring, which is flexibly connected to the bottom of both the outer and inner containment layers. The bottom of the double-layered containment structure is connected to the ground support foundation via a swing device, which is a vertical tension-compression support.

[0007] The foamed metal material is aluminum foam with a thickness greater than 25mm, and the compressive strength of the ultra-high performance concrete layer is greater than 120MPa.

[0008] The sealing material of the sealing ring is neoprene rubber, perfluoroelastomer rubber, or fluororubber.

[0009] The radial width of the cavity between the negative pressure shells is not less than 2m, which can accommodate the swaying and rotational deformation of the vertical tension and compression support.

[0010] The vertical tension and compression bearing is one or a combination of several of the following: helical spring tension and compression bearing, disc-shaped vertical tension and compression bearing, ring spring bearing, laminated thick rubber bearing, or air vertical tension and compression bearing.

[0011] The vertical tension and compression support is equipped with a horizontal displacement limiting device and a vertical tension and compression deformation limiting device, both of which use guide limiting steel pipes.

[0012] The pier foundation includes a set of outer piers and a set of inner piers. The vertical tension and compression bearings include a set of outer bearings located between the bottom edge of the outer containment shell and the outer piers, and a set of inner bearings located between the bottom edge of the inner containment shell and the inner piers. Under the action of external loads, the outer containment shell and the inner containment shell oscillate and rotate around the centroids of the outer and inner bearings, respectively.

[0013] The bottom end of the outer containment layer extends beyond the bottom end of the inner containment layer, and the centroid height of the outer support is lower than that of the inner support. When the outer containment is bottom-closed, the bottom plate of the outer containment has a hole that allows the inner support to pass through, and the hole is flexibly sealed with a sealing material.

[0014] The swaying device also includes energy dissipation and vibration reduction devices that correspond one-to-one with the vertical tension and compression supports. Each energy dissipation and vibration reduction device is installed between the double-layer safety shell and the support foundation.

[0015] The energy dissipation and vibration reduction device is a viscous damper or a viscoelastic damper.

[0016] Compared with the prior art, this utility model has the following features and beneficial effects: I. This utility model features a double-layer containment structure with a specifically designed outer containment layer. The outer containment layer serves as the protective layer for the inner containment layer, providing triple impact protection. The outer aluminum foam surface layer, with a thickness ≥25mm, can absorb 70% of the impact energy; the ultra-high performance concrete core layer, with a compressive strength ≥120MPa, can further inhibit crack propagation; and the prestressed concrete backing layer provides overall stability, preventing the failure of a single material.

[0017] Second, the bottom of the double-layer safety shell of this utility model adopts a combined limiting vertical tension and compression support to ensure the safety of the double-layer safety shell. The horizontal limiting device can adopt a double steel pipe guide structure to accurately control the displacement. The vertical deformation limiter triggers rigid constraint when the tension or compression exceeds the limit to prevent overturning, and works with the energy dissipation and shock absorption device to improve the overall seismic resistance.

[0018] Third, this utility model can be modularly constructed. The vertical tension and compression support and the energy dissipation and vibration reduction device can be assembled into a standardized module. The sealing ring is directly connected to the inner and outer safety shells to adapt to dynamic displacement, maintain the airtightness of the negative pressure chamber, and improve installation efficiency. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Figure 1 This is a front view structural diagram of the structure of Embodiment 1 of this utility model.

[0021] Figure 2 yes Figure 1 and Figure 5 A top-down view.

[0022] Figure 3 This invention relates to the motion characteristics of its overall structure under external impact loads.

[0023] Figure 4 It is a partial enlarged view of the structural cross-section of the outer containment shell and the combination of vertical tension and compression supports and energy dissipation and damping devices.

[0024] Figure 5 This is a front view structural diagram of the second embodiment of this utility model.

[0025] Reference numerals: 1-Outer containment layer, 11-Surface layer, 12-Core layer, 13-Back layer, 14-Bottom plate, 2-Inner containment layer, 3-Cavity between negative pressure shells, 4-Nuclear reactor, 5-Sealing ring, 6-Vertical tension and compression support, 61-Outer support, 62-Inner support, 7-Energy dissipation and vibration reduction device, 8-Support foundation, 81-Outer support, 82-Inner support, 9-Ground, 10-Sealing material. Detailed Implementation

[0026] See Example 1 Figure 1-4 As shown, the containment structure with a composite protective layer and limiting tension / compression supports includes: The containment consists of an outer containment 1 and an inner containment 2.

[0027] The outer containment shell 1 is a cover with an open bottom. The outer containment shell 1 is a multi-layer material composite structure, which includes a surface layer 11, a core layer 12 and a back layer 13 from the outside to the inside. The surface layer 11 is made of foamed metal material, the core layer 12 is made of ultra-high performance concrete, and the back layer 13 is a non-prestressed concrete structure, a prestressed concrete structure or a steel structure.

[0028] In this embodiment, the foamed metal material is aluminum foam with a thickness greater than 25 mm, and the compressive strength of the ultra-high performance concrete layer is greater than 120 MPa. Ultra-high performance concrete (UHPC) is a cement-based engineering material that embodies two "ultra" aspects: ultra-high durability and ultra-high mechanical properties.

[0029] The inner containment 2 is a bottom-closed enclosure with a hemispherical dome that is directly connected to the cylindrical wall. It is a steel structure or a steel-concrete composite structure with a steel lining. The nuclear reactor 4 is housed inside the inner containment 2.

[0030] The bottom of the double-layered containment structure is connected to the support foundation 8 on the ground 9 by a swing device, which is a vertical tension and compression support 6.

[0031] A negative pressure inter-shell cavity 3 is formed between the outer containment shell 1 and the inner containment shell 2. The bottom of the negative pressure inter-shell cavity 3 is sealed by a sealing ring 5, and the sealing ring 5 is flexibly connected to the bottom of both the outer containment shell 1 and the inner containment shell 2. The radial width of the negative pressure inter-shell cavity 3 is not less than 2m, accommodating the swaying and rotational deformation of the vertical tension and compression support 6. In this embodiment, the sealing material of the sealing ring 5 is neoprene rubber, perfluoroelastomer rubber, or fluororubber.

[0032] The vertical tension / compression support 6 is one or a combination of several of the following: a helical spring tension / compression support, a disc-shaped vertical tension / compression support, a ring spring support, a laminated thick rubber support, or an air vertical tension / compression support. In this embodiment, a helical spring tension / compression support is used.

[0033] The vertical tension-compression support 6 is equipped with a horizontal displacement limiting device and a vertical tension-compression deformation limiting device, both of which can be guide limiting steel pipes. The horizontal limiting device restricts the horizontal displacement of the support, provides tension and compression bearing capacity for the vertical tension and compression deformation of the support, and simultaneously bears the shear force in the horizontal direction. The vertical tension-compression deformation limiting device restricts the vertical stretching or compression of the support, ensuring that it does not exceed the design limit value of the tensile or compressive deformation of the support. The length of the vertical tension-compression support is fixed, and the tensile or compressive stiffness is significantly increased, equivalent to the fixed end constraint at the bottom of a traditional structure, thereby preventing the overturning of the overall structure.

[0034] The vertical tension / compression support 6 includes a set of outer supports 61 disposed between the bottom edge of the outer containment shell 1 and the pier foundation 8, and a set of inner supports 62 disposed between the bottom edge of the inner containment shell 1 and the pier foundation 8. Under the action of external loads, the outer containment shell 1 and the inner containment shell 2 oscillate and rotate around the centroids of the outer supports 61 and the inner supports 62, respectively. The pier foundation 8 includes a set of outer supports 81 corresponding to the outer supports 61 and a set of inner supports 82 corresponding to the inner supports 62. The pier foundation 8 is generally made of reinforced concrete. In this embodiment, eight outer supports 61 and eight inner supports 62 are provided around the perimeter.

[0035] The bottom end of the outer containment 1 extends beyond the bottom end of the inner containment 2, and the centroid height of the outer support 61 is lower than that of the inner support 62. This ensures that the bottom swing unloading rotation of the inner containment 2 is located within the outer containment 1, further guaranteeing the protection of the inner containment 2 by the outer containment 1.

[0036] Example 2, Participation Figure 5 and Figure 2 As shown, unlike Embodiment 1, the outer containment shell 1 is a bottom-closed enclosure. The bottom plate 14 of the outer containment shell 1 has reserved holes that allow the inner support 82 to pass through. The holes are flexibly sealed with sealing material 10.

[0037] The swaying device also includes energy dissipation and damping devices 7, each corresponding to a vertical tension / compression support 6. Energy is further dissipated through deformation of these devices. Each energy dissipation and damping device 7 is positioned between the double-layer containment shell and the support foundation 8. The placement of the energy dissipation and damping devices 7 is adapted to the type of vertical tension / compression support, requiring a reasonable arrangement of their installation positions. In this embodiment, they are positioned on one side of the corresponding vertical tension / compression support 6. In this embodiment, the energy dissipation and damping device 7 is a viscous damper or a viscoelastic damper.

[0038] This utility model is a separate connection design of vertical tension and compression support and inner and outer safety shells. The outer safety shell, combined with multi-layer composite impact-resistant material, can resist impact loads by swinging alone. The outer and inner safety shells can resist seismic loads by swinging simultaneously. This double-layer safety shell structure has both seismic and impact resistance functions, effectively combining seismic and impact resistance technologies. It provides a new design idea for reducing damage and destruction under strong earthquakes and impact loads. Due to its strong structural stability and strong self-resetting ability, it can effectively control residual displacement after earthquakes and impact loads, which has great economic significance and social value.

Claims

1. A containment structure with a composite protective layer and limiting tension / compression supports, characterized in that, include: The containment consists of an outer containment (1) and an inner containment (2). The outer containment shell (1) is a shell with an open or closed bottom. The outer containment shell (1) is a multi-layer composite structure, which includes a surface layer (11), a core layer (12), and a back layer (13) from the outside to the inside. The surface layer (11) is made of foamed metal material, the core layer (12) is made of ultra-high performance concrete, and the back layer (13) is made of non-prestressed concrete, prestressed concrete, or steel structure. The inner containment structure (2) is a bottom-closed enclosure, which is a steel structure or a steel-concrete composite structure with a steel lining, and houses the nuclear reactor (4) inside the inner containment structure (2). A negative pressure inter-shell cavity (3) is formed between the outer containment (1) and the inner containment (2). The bottom of the negative pressure inter-shell cavity (3) is sealed by a sealing ring (5). The sealing ring (5) is flexibly connected to the bottom of both the outer containment (1) and the inner containment (2). The bottom of the double-layered containment structure is connected to the support foundation (8) on the ground (9) by a swing device, which is a vertical tension and compression support (6).

2. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 1, characterized in that: The foamed metal material is aluminum foam with a thickness greater than 25mm, and the compressive strength of the ultra-high performance concrete layer is greater than 120MPa.

3. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 1, characterized in that: The sealing material of the sealing ring (5) is chloroprene rubber, perfluoroether rubber or fluororubber.

4. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 1, characterized in that: The radial width of the cavity (3) between the negative pressure shells is not less than 2m, which can accommodate the swaying and rotating deformation of the vertical tension and compression support (6).

5. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 1, characterized in that: The vertical tension and compression support (6) is one or a combination of several of the following: helical spring tension and compression support, disc-shaped vertical tension and compression support, ring spring support, laminated thick rubber support or air vertical tension and compression support.

6. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 1, characterized in that: The vertical tension and compression support (6) is equipped with a horizontal displacement limiting device and a vertical tension and compression deformation limiting device. Both the horizontal displacement limiting device and the vertical tension and compression deformation limiting device adopt guide limiting steel pipes.

7. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 4, characterized in that: The pier foundation (8) includes a set of outer piers (81) and a set of inner piers (82). The vertical tension and compression bearing (6) includes a set of outer bearings (61) located between the bottom edge of the outer safety shell (1) and the outer piers (81), and also includes a set of inner bearings (62) located between the bottom edge of the inner safety shell (2) and the inner piers (82). Under the action of external loads, the outer safety shell (1) and the inner safety shell (2) swing and rotate around the centroid of the outer bearings (61) and the centroid of the inner bearings (62), respectively.

8. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 7, characterized in that: The bottom end of the outer containment (1) extends beyond the bottom end of the inner containment (2), and the centroid height of the outer support (61) is lower than that of the inner support (62). When the outer containment (1) is closed at the bottom, the bottom plate (14) of the outer containment (1) is reserved with a hole that allows the inner support (82) to pass through, and the hole is flexibly sealed by a sealing material (10).

9. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 1, characterized in that: The swaying device also includes energy dissipation and vibration reduction devices (7) that correspond one-to-one with the vertical tension and compression supports (6). Each energy dissipation and vibration reduction device (7) is set between the double-layer safety shell and the support foundation (8).

10. The containment structure with a composite protective layer and limiting tension / compression supports according to claim 9, characterized in that: The energy dissipation and vibration reduction device (7) is a viscous damper or a viscoelastic damper.

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