A roof structure for a small reactor building

Abstract

An embodiment of the present invention discloses a roof structure for a small-scale reactor building, comprising: a first section, the first section comprising a first steel plate and a first concrete area, the first concrete area being disposed on the outer side of the first steel plate, the first steel plate being provided with a first anchor; a second section disposed above the first section, the second section being provided with a reinforcing ring beam at the connection between the second section and the first section, the second section being connected to the first section via the reinforcing ring beam, the reinforcing ring beam being provided with flow holes for concrete circulation. The roof structure for a small-scale reactor building provided by the present invention has a reinforcing ring beam disposed at the connection between the first section and the second section to reduce the impact of the removal of the second section on the stability of the overall roof structure, thereby improving the convenience of maintaining the main equipment of the reactor building. Furthermore, by providing a first steel plate in the first section as a formwork for pouring concrete, the overall strength and rigidity of the roof structure are increased, while also improving the construction efficiency of the roof structure.

Description

Technical Field

[0001] The present invention relates to the technical field of structural design of a small modular reactor nuclear power plant building, and more particularly to a roof structure of a small modular reactor building. Background Art

[0002] Small reactors have the characteristics of high parameters and high safety, a wide range of market applications, and good application prospects. Its flexible combination of multiple modules further expands its use scenarios and development space. Small reactors are freely combined with multiple modules, and the array is arranged in the containment of the reactor building. Among them, the small reactor module consists of a reactor compartment and an evaporator compartment. The evaporator compartment is generally arranged near the center of the containment, and the reactor compartment is generally arranged near the outer wall of the containment. The roof structure of the reactor building often adopts a flat roof structure or a dome roof structure.

[0003] In existing technology, reactor building roof structures are often constructed by first setting up formwork and then pouring concrete, resulting in a concrete roof structure. This not only makes it difficult to ensure strength and rigidity, but also makes setting up formwork difficult due to the generally high height of small reactor buildings. This results in low construction efficiency for small reactor building roof structures and poses safety risks. Furthermore, during normal operation of the reactor building, repairing and replacing key equipment is difficult.

[0004] Furthermore, the main equipment for multi-module small reactors is generally large, making it difficult to move in and out of the reactor building. The main equipment must first be hoisted into the building via an open-top method before the roof structure of the reactor building can be constructed. This results in a long construction period for the reactor building, which in turn reduces construction efficiency. Due to the long manufacturing cycle and inconsistent arrival times of the main equipment for multi-module small reactors, a clean area must be established within the reactor building during the intervals between the arrival of the main equipment, requiring the reactor building to be temporarily sealed.

[0005] Therefore, how to ensure the construction efficiency of the roof structure of the small reactor building while improving the convenience of subsequent maintenance of the main equipment in the reactor building has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the object of the present invention is to provide a roof structure for a small-scale reactor building, so as to improve the convenience of subsequent maintenance of the main equipment in the reactor building while ensuring the construction efficiency of the roof structure of the small-scale reactor building.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A roof structure for a small reactor building, comprising:

[0009] a first subsection, the first subsection comprising a first steel plate and a first concrete area, the first concrete area being disposed on an outer side of the first steel plate, and a first anchor being disposed on the first steel plate for connecting the first concrete area and the first steel plate;

[0010] The second section is arranged above the first section, and a reinforcing ring beam is provided at the connection position between the second section and the first section. The second section is connected to the first section through the reinforcing ring beam, and the reinforcing ring beam is provided with flow holes for concrete circulation.

[0011] Optionally, in the roof structure of the above-mentioned small reactor building, the reinforced ring beam includes a first side steel plate and a second side steel plate arranged opposite to each other, a vertical rib is arranged between the first side steel plate and the second side steel plate, and the flow hole is opened on the vertical rib.

[0012] Optionally, in the roof structure of the above-mentioned small reactor building, UHPC concrete is poured between the first side steel plate and the second side steel plate to improve the strength of the reinforced ring beam.

[0013] Optionally, in the roof structure of the above-mentioned small reactor building, the roof structure is a dome structure, and the roof structure includes a first dome portion and a second dome portion, the first dome portion is the first division, the second dome portion is the second division, and the first dome portion and the second dome portion are connected by the reinforced ring beam.

[0014] Optionally, in the roof structure of the above-mentioned small reactor building, a circular lifting opening is opened on the first section, and the circular lifting opening is arranged in a one-to-one correspondence with the reactor compartment, for lifting the equipment of the reactor compartment, and a lifting cover is provided at the position of the circular lifting opening for closing the circular lifting opening.

[0015] Optionally, in the roof structure of the above-mentioned small reactor building, a concrete reinforcement area is provided around the circular lifting opening, and the concrete reinforcement area is formed by pouring UHPC concrete.

[0016] Optionally, in the roof structure of the small reactor building, the first steel plate of the first section is provided with intersecting first stiffening ribs and second stiffening ribs;

[0017] The lifting cover plate includes a second steel plate and a second concrete area, the second concrete area is located above the second steel plate, and a second anchor is provided on the second steel plate for connecting the second steel plate and the second concrete area, and the second steel plate is provided with intersecting third stiffening ribs and fourth stiffening ribs.

[0018] Optionally, in the roof structure of the small-scale reactor building, the first concrete area of ​​the first subsection includes a first pre-cast concrete area, the first anchor of the first subsection is a first stud, the first stud is welded to the first steel plate of the first subsection, and the first stud extends out of the first pre-cast concrete area;

[0019] The second concrete area of ​​the hoisting cover plate includes a second pre-cast concrete area. The second anchor of the hoisting cover plate is a second bolt. The second bolt is welded to the second steel plate of the hoisting cover plate, and the second bolt extends out of the second pre-cast concrete area.

[0020] Optionally, in the roof structure of the above-mentioned small reactor building, the second section includes a third steel plate and a third concrete area, the third steel plate is provided with a third anchor, the third anchor is used to connect the third concrete area and the third steel plate, and the third steel plate is provided with intersecting fifth stiffening ribs and sixth stiffening ribs.

[0021] Optionally, in the roof structure of the above-mentioned small reactor building, the third concrete area of ​​the second section includes a third pre-cast concrete area, the third anchor is a third bolt, the third bolt is welded to the third steel plate of the second section, and the third bolt extends out of the third pre-cast concrete area.

[0022] Optionally, in the roof structure of the small-scale reactor building, the first concrete area of ​​the first subsection further includes a first intermediate concrete area and a first post-cast concrete area, the first post-cast concrete area being located outside the first initial concrete area, and the first intermediate concrete area being located between the first initial concrete area and the first post-cast concrete area.

[0023] The second concrete area of ​​the hoisting cover plate further includes a second intermediate cast concrete area and a second post-cast concrete area, the second post-cast concrete area is located above the second first cast concrete area, the second intermediate cast concrete area is located between the second first cast concrete area and the second post-cast concrete area, a first steel mesh is provided in both the first post-cast concrete area and the second post-cast concrete area, and the first steel mesh of the first section is connected to the first anchor by a first tie bar, and the first steel mesh of the hoisting cover plate is connected to the second anchor by a second tie bar;

[0024] The third concrete area of ​​the second section further includes a third post-cast concrete area, in which a second steel mesh is provided. The second steel mesh is connected to the third anchor through a third tie rod.

[0025] Optionally, in the roof structure of the small reactor building, the concrete of the first pre-cast concrete area and the first intermediate cast concrete area are both UHPC concrete;

[0026] The concrete of the second pre-cast concrete area and the second intermediate cast concrete area are both UHPC concrete;

[0027] The concrete of the third pre-cast concrete area and the third post-cast concrete area are both UHPC concrete;

[0028] The concrete of the first post-cast concrete zone and the second post-cast concrete zone are both ordinary concrete, or the concrete of the first post-cast concrete zone and the second post-cast concrete zone are both UHPC concrete.

[0029] The roof structure of the small-scale reactor building provided by the present invention forms a split-structure roof by arranging the second branch above the first branch and connecting it to the first branch through a reinforced ring beam. When some equipment needs to be maintained and replaced, the second branch can be removed from the connection position between the reinforced ring beam and the second branch, thereby reducing the impact on the stability of the overall roof structure, facilitating the replacement of the main equipment inside the reactor building, and improving the convenience of the main equipment in the reactor building in the later maintenance. At the same time, a flow hole is provided on the reinforced ring beam. When concrete is poured at the connection position between the first branch and the second branch, the concrete flows through the flow hole to the entire reinforced ring beam, so that the connection position between the first branch and the second branch can be poured, thereby improving the pouring efficiency. In addition, the first section is provided with a first steel plate, and concrete is poured on the outer side of the first steel plate to form a first concrete area. A first anchor is provided on the first steel plate to connect the first concrete area and the first steel plate, thereby improving the bonding strength between the first concrete area and the first steel plate. The first steel plate is used instead of the formwork, and the first steel plate is used as a component of the load-bearing member of the roof structure. The concrete pouring process can be completed without supporting the formwork, thereby increasing the overall strength and rigidity of the roof structure and simplifying the concrete pouring process.

[0030] Compared with the prior art, the roof structure of the small reactor building provided by the present invention provides a reinforcing ring beam at the connection position of the first section and the second section to facilitate the removal of the second section from the entire roof structure, thereby reducing the impact on the stability of the overall roof structure, facilitating the repair and replacement of the main equipment in the reactor building during the later maintenance process, and improving the convenience of the main equipment in the reactor building during the later maintenance. At the same time, by providing the first steel plate in the first section as a template for concrete pouring, the overall strength and rigidity of the roof structure are increased while the concrete pouring process is simplified, thereby improving the construction efficiency of the roof structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0032] Figure 1 A plan view of the interior of a small reactor building provided by an embodiment of the present invention;

[0033] Figure 2 A cross-sectional view of a small reactor building provided by an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of the roof structure of a small reactor building provided by an embodiment of the present invention Figure 1 ;

[0035] Figure 4 Schematic diagram of the roof structure of a small reactor building provided by an embodiment of the present invention Figure 2 ;

[0036] Figure 5 A schematic structural diagram of a hoisting cover plate provided in an embodiment of the present invention.

[0037] Among them, 100 is the containment, 101 is the reactor compartment, 102 is the steam generator compartment, 200 is the reinforced ring beam, 201 is the first side steel plate, 202 is the second side steel plate, 203 is the vertical rib, 204 is the flow hole, 300 is the first dome, 301 is the first steel plate, 302 is the first pre-cast concrete area, 303 is the first anchor, 304 is the first stiffening rib, 305 is the second stiffening rib, 306 is the lifting cover, 3061 is the second steel plate, 3062 is the second pre-cast concrete area, 3063 is the second anchor, 3064 is the third stiffening rib, 3065 is the lifting cover, 3066 is the fourth stiffening rib, 3067 is the second post-cast concrete area, 3068 is the second reinforcement, 307 is the concrete reinforcement area, 308 is the first mid-cast concrete area, 309 is the first post-cast concrete area, 3091 is the first steel mesh, 3092 is the first reinforcement, 400 is the second dome, 401 is the third steel plate, 402 is the third pre-cast concrete area, 403 is the third anchor, 404 is the fifth stiffening rib, 405 is the sixth stiffening rib, 406 is the third post-cast concrete area, 4061 is the second steel mesh, and 4062 is the third reinforcement. DETAILED DESCRIPTION

[0038] The core of the present invention is to provide a roof structure for a small-scale reactor building, so as to improve the convenience of later maintenance of the main equipment in the reactor building while ensuring the construction efficiency of the roof structure of the small-scale reactor building.

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] like Figure 2 and Figure 3As shown, an embodiment of the present invention discloses a roof structure of a small reactor reactor building, comprising a first subdivision and a second subdivision. It should be noted that in the prior art, since the roof structure of the reactor building often adopts a construction method of first setting up the formwork and then pouring concrete to form a concrete roof structure, not only is it difficult to ensure strength and rigidity, but also since the height of the small reactor reactor building is generally high, the formwork setting work is more difficult, resulting in low construction efficiency of the roof structure of the small reactor reactor building and safety risks. At the same time, during the normal operation of the reactor building, it is more difficult to repair and replace some equipment in the steam generator compartment 102. The roof structure of the small reactor reactor building disclosed in the embodiment of the present invention is provided with a first subdivision and a second subdivision, the second subdivision is located above the first subdivision, and is connected to the first subdivision through a reinforcing ring beam 200, as shown in FIG. Figure 1 As shown, a split-structure roof is formed, and the second division corresponds to the area where the steam generator compartment 102 is located, as shown Figure 1 and Figure 2 As shown, when maintenance or replacement of some equipment in the steam generator compartment 102 is required, the second section can be removed from the connection between the reinforcing ring beam 200 and the second section, and then the equipment in the steam generator compartment 102 can be replaced. By removing the second section from the connection between the reinforcing ring beam 200 and the second section, the impact on the stability of the overall roof structure can be reduced. At the same time, by providing a first steel plate 301 in the first section as a formwork for pouring concrete and utilizing the first steel plate 301 as a load-bearing component of the roof structure, the overall strength and rigidity of the roof structure are increased while simplifying the concrete pouring process, thereby improving the construction efficiency of the roof structure.

[0041] Among them, such as Figure 3 As shown, the first subsection includes a first steel plate 301 and a first concrete area. The first concrete area is disposed outside the first steel plate 301. A first anchor 303 is provided on the first steel plate 301 to connect the first concrete area to the first steel plate 301, thereby improving the adhesion between the first concrete area and the first steel plate 301. Specifically, for ease of understanding, the two ends of the first steel plate 301 are defined as a first end and a second end, respectively. The first end of the first steel plate 301 is fixed to the wall of the containment vessel 100 of the reactor building, and the second end of the first steel plate 301 is connected to the second subsection. The first anchor 303 is welded to the first steel plate 301 to improve the adhesion between the first concrete area formed by pouring concrete and the first steel plate 301. The first steel plate 301 not only serves as a concrete pouring formwork to simplify the concrete pouring process, thereby improving the construction efficiency of the roof structure, but also serves as a load-bearing component of the roof structure, thereby enhancing the overall strength and rigidity of the roof structure.

[0042] Furthermore, the second section is arranged above the first section, and a reinforcing ring beam 200 is provided at the connection position between the second section and the first section. The second section is connected to the first section through the reinforcing ring beam 200 to form a split-structure roof, thereby facilitating the maintenance and replacement of some equipment in the reactor building. At the same time, a flow hole 204 for concrete circulation is provided on the reinforcing ring beam 200. When concrete is poured at the connection position between the first section and the second section, the concrete flows through the flow hole 204 to the entire reinforcing ring beam 200, so as to pour the connection position between the first section and the second section, thereby improving the pouring efficiency. Specifically, since the steam generator compartment 102 is generally arranged near the center of the containment vessel 100 and below the second subsection, the reactor compartment 101 is generally arranged near the outer wall of the containment vessel 100, and some of the equipment in the steam generator compartment 102 requires maintenance at a later stage, when some of the equipment in the steam generator compartment 102 needs to be repaired or replaced, the second subsection can be removed from the connection between the reinforcing ring beam 200 and the second subsection by cutting, and then the equipment in the steam generator compartment 102 can be hoisted out of the factory for repair or replacement. Since the second subsection is removed from the connection between the reinforcing ring beam 200 and the second subsection, the reinforcing ring beam 200 remains at the second end of the first subsection, thereby reducing the impact on the first subsection and thus reducing the impact on the stability of the entire roof structure.

[0043] The roof structure of the small reactor building provided by the present invention is formed by arranging the second branch above the first branch and connecting it to the first branch through the reinforcing ring beam 200 to form a split structure roof. When some equipment needs to be maintained and replaced, the second branch can be removed from the connection position between the reinforcing ring beam 200 and the second branch, thereby reducing the impact on the stability of the overall roof structure, facilitating the replacement of the main equipment inside the reactor building, and improving the convenience of the main equipment in the reactor building in the later maintenance. At the same time, a flow hole 204 is provided on the reinforcing ring beam 200. When concrete is poured at the connection position between the first branch and the second branch, the concrete flows through the flow hole 204 to the entire reinforcing ring beam 200, so that the connection position between the first branch and the second branch can be poured, thereby improving the pouring efficiency. In addition, the first section is provided with a first steel plate 301, and concrete is poured on the outer side of the first steel plate 301 to form a first concrete area. A first anchor 303 is provided on the first steel plate 301 for connecting the first concrete area and the first steel plate 301, thereby improving the bonding strength between the first concrete area and the first steel plate 301. The first steel plate 301 is used to replace the formwork, and the first steel plate 301 is used as a component of the load-bearing member of the roof structure. The concrete pouring process can be completed without supporting the formwork, thereby increasing the overall strength and rigidity of the roof structure while simplifying the concrete pouring process.

[0044] Compared with the prior art, the roof structure of the small reactor building provided by the present invention provides a reinforcing ring beam 200 at the connection position between the first section and the second section to facilitate the removal of the second section from the entire roof structure, thereby reducing the impact on the stability of the overall roof structure, facilitating the repair and replacement of the main equipment in the reactor building during the later maintenance process, and improving the convenience of the main equipment in the reactor building during the later maintenance. At the same time, by providing the first steel plate 301 in the first section as a template for concrete pouring, the overall strength and rigidity of the roof structure are increased, the concrete pouring process is simplified, and the construction efficiency of the roof structure is improved.

[0045] Furthermore, if Figure 3 and Figure 4 As shown, in one embodiment, the reinforced ring beam 200 includes a first side steel plate 201 and a second side steel plate 202, which are arranged opposite each other. The first side steel plate 201 is the outer steel plate of the reinforced ring beam 200, and the second side steel plate 202 is the inner steel plate of the reinforced ring beam 200. The first and second side steel plates 201, 202 are respectively welded to the first steel plate 301 of the first subsection, while the second subsection is connected to the second side steel plate 202 of the reinforced ring beam 200. A plurality of vertical ribs 203 are disposed between the first and second side steel plates 201, 202. The vertical ribs 203 are distributed in an annular pattern and are welded to the first and second side steel plates 201, 202. Flow holes 204 are provided in the vertical ribs 203. UHPC concrete is poured between the first and second side steel plates 201, 202 to enhance the strength of the reinforced ring beam 200. When pouring UHPC concrete at the connection between the first and second sections, the UHPC concrete is poured through the flow holes 204 into the entire reinforced ring beam 200, thereby increasing the strength at the connection between the first and second sections. It should be noted that UHPC (Ultra-High Performance Concrete) concrete has superior mechanical properties compared to other conventional concretes, significantly improving the strength and stability of the component.

[0046] Furthermore, if Figure 3 and Figure 4As shown, in one embodiment, the roof structure is a dome structure, and the roof structure includes a first dome portion 300 and a second dome portion 400. The first dome portion 300 is a first subdivision, and the second dome portion 400 is a second subdivision. The first dome portion 300 and the second dome portion 400 are connected by a reinforcing ring beam 200. When pouring UHPC concrete at the connection between the first dome portion 300 and the second dome portion 400, the UHPC concrete is poured through the flow holes 204 into the entire reinforcing ring beam 200, thereby improving the strength of the connection between the first dome portion 300 and the second dome portion 400.

[0047] Furthermore, if Figure 3 and Figure 5 As shown, in one specific embodiment, a circular lifting opening is provided on the first section, corresponding one-to-one with the reactor compartment 101 and used for lifting equipment in the reactor compartment 101. A lifting cover 306 is provided at the position of the circular lifting opening to seal the circular lifting opening, and a concrete reinforcement area 307 is provided around the circular lifting opening. The concrete reinforcement area 307 is formed by pouring UHPC concrete. Intersecting stiffening ribs are provided on the first steel plate 301 of the first section. For ease of understanding, the intersecting stiffening ribs are defined as first stiffening ribs 304 and second stiffening ribs 305. The first stiffening ribs 304 and second stiffening ribs 305 can be arranged in a mutually perpendicular circumferential and radial manner, or in a non-perpendicular arrangement. In this embodiment, the first stiffening rib 304 and the second stiffening rib 305 are respectively welded to the first steel plate 301 of the first section to improve the stiffness of the first steel plate 301 and increase the bonding force between the first concrete area of ​​the first section and the first steel plate 301.

[0048] Furthermore, if Figure 3 As shown, the lifting cover plate 306 includes a second steel plate 3061 and a second concrete area. The second concrete area is located above the second steel plate 3061, and a second anchor 3063 is provided on the second steel plate 3061 for connecting the second steel plate 3061 and the second concrete area to increase the bonding force between the second steel plate 3061 and the second concrete area. At the same time, intersecting stiffening ribs are provided on the second steel plate 3061. For ease of understanding, the intersecting stiffening ribs are defined as third stiffening ribs 3064 and fourth stiffening ribs 3065, respectively, and the third stiffening ribs 3064 and the fourth stiffening ribs 3065 can be arranged in a staggered manner or in a perpendicular manner. Of course, the shape of the lifting cover plate 306 can be a circular lifting cover plate corresponding to the circular lifting opening, or a square lifting cover plate. In this embodiment, the shape of the lifting cover plate 306 is a circular lifting cover plate corresponding to the circular lifting opening, and the third stiffening rib 3064 and the fourth stiffening rib 3065 are arranged in a staggered manner and welded to the second steel plate 3061. Figure 5 First mounting holes are provided around the second steel plate 3061 of the hoisting cover plate 306, allowing the hoisting cover plate 306 to be fixed to the first steel plate 301 of the first section via first fasteners. Second mounting holes are provided on the third stiffening ribs 3064 and the fourth stiffening ribs 3065 located around the hoisting cover plate 306, and second fasteners are used to connect the hoisting cover plate 306 to the stiffening ribs of the first section and the first side steel plate 201 of the reinforced ring beam 200, respectively.

[0049] Specifically, if Figure 3 As shown, the first fastener is fixed with a high-strength bolt, and the second fastener 2 is fixed with a one-way bolt. Of course, the first fastener can also be a one-way bolt. The one-way bolt can be tightened by screwing one side of the bolt. In this embodiment, the screwing side of the one-way bolt is located on one side of the lifting cover plate 306, that is, the side away from the stiffening rib of the first section or the side away from the first side steel plate 201 of the reinforcing ring beam 200, so that the screwing tool has operating space to facilitate the screwing tool to tighten the second fastener. When it is necessary to lift the equipment of the reactor compartment 101 from the circular lifting port into the reactor building, the first and second fasteners are first removed using a screwing tool, and then the lifting equipment is used to open the lifting cover plate 306. At the same time, the equipment of the reactor compartment 101 is lifted from the circular lifting port into the reactor compartment 101. At this time, the lifting equipment is used to place the lifting cover plate 306 into the circular lifting port and secure it with the first and second fasteners. It should be noted that the circular lifting opening design can match the outer side of the pressure vessel of the reactor compartment 101, thereby avoiding the pressure vessel from colliding with the lifting opening during lifting, causing damage to the pressure vessel. At the same time, it can reduce the space occupied by the lifting opening, so as to reduce the impact of the opening on the overall stability of the roof structure.

[0050] Furthermore, if Figure 3 As shown, in one specific embodiment, the first concrete area of ​​the first section includes a first pre-cast concrete area 302, namely, UHPC concrete is poured outside the first steel plate 301 of the first section to form the first pre-cast concrete area 302. The second concrete area of ​​the lifting cover 306 includes a second pre-cast concrete area 3062, namely, UHPC concrete is poured above the second steel plate 3061 of the lifting cover 306 to form the second pre-cast concrete area 3062. The first anchor 303 of the first section is a first bolt, which is welded to the first steel plate 301 of the first section and extends out of the first pre-cast concrete area 302. The second anchor 3063 of the lifting cover 306 is a second bolt, which is welded to the second steel plate 3061 of the lifting cover 306 and extends out of the second pre-cast concrete area 3062.

[0051] Furthermore, when a clean area needs to be established in a small reactor building, in order to prevent dust from entering the small reactor building, such as Figure 3 As shown, in one specific embodiment, the second section includes a third steel plate 401 and a third concrete zone. The third steel plate 401 is detachably connected to the second side steel plate 202 of the reinforced ring beam 200. A third anchor 403 is provided on the third steel plate 401, connecting the third concrete zone to the third steel plate 401. Intersecting fifth and sixth stiffening ribs 404 and 405 are provided on the third steel plate 401. Specifically, the third concrete zone of the second section includes a third precast concrete zone 402, which is formed by pouring UHPC concrete above the third steel plate 401 of the second section. The third anchor 403 of the second section is a third bolt, welded to the third steel plate 401 of the second section, and extends beyond the third precast concrete zone 402. Specifically, the third steel plate 401 is connected to the second side steel plate 202 of the reinforcing ring beam 200 by bolts, so that the second section plays the role of temporary opening and temporary closing. While ensuring the closedness of the small reactor building, it can also be easily disassembled, thereby ensuring that the main equipment of the steam generator compartment 102 can easily enter the small reactor building. At the same time, when a clean area needs to be established in the small reactor building, a lifting device is used to place the lifting cover plate 306 on the circular lifting opening, and the first fastener and the second fastener are used to temporarily fix it, thereby closing the circular lifting opening to ensure the closedness of the reactor building. The specific implementation method of fixing the lifting cover plate 306 has been explained and illustrated in the above embodiment, and will not be repeated here.

[0052] Furthermore, if Figure 4As shown, when all the pressure vessels of the reactor compartment 101 have entered the reactor building and have been installed in place, the circular lifting port can be closed. In a specific embodiment, the first concrete area of ​​the first section also includes a first intermediate concrete area 308 and a first post-cast concrete area 309. The first post-cast concrete area 309 is located outside the first pre-cast concrete area 302, and the first intermediate concrete area 308 is located between the first pre-cast concrete area 302 and the first post-cast concrete area 309, that is, UHPC concrete is poured outside the first pre-cast concrete area 302 to form the first intermediate concrete area 308, and ordinary concrete or UHPC concrete is poured outside the first intermediate concrete area 308 to form the first post-cast concrete area 309. In this embodiment, ordinary concrete is poured outside the first intermediate concrete area 308 to form the first post-cast concrete area 309 to prevent shrinkage and cracking of UHPC concrete and reduce the aesthetics and strength of the outer side of the first section. The second concrete area of ​​the lifting cover plate 306 also includes a second intermediate cast concrete area 3066 and a second post-cast concrete area 3067. The second post-cast concrete area 3067 is located above the second first cast concrete area 3062, and the second intermediate cast concrete area 3066 is located between the second first cast concrete area 3062 and the second post-cast concrete area 3067, that is, UHPC concrete is poured above the second first cast concrete area 3062 to form the second intermediate cast concrete area 3066, and ordinary concrete or UHPC concrete is poured above the second intermediate cast concrete area 3066 to form the second post-cast concrete area 3067. In this embodiment, ordinary concrete is poured on the outside of the second intermediate cast concrete area 3066 to form the second post-cast concrete area 3067.

[0053] Furthermore, if Figure 4 As shown, first steel mesh sheets 3091 are provided in both the first post-cast concrete area 309 and the second post-cast concrete area 3067. The first steel mesh sheets 3091 in the first section are connected to the first anchor 303 via first tie bars 3092, and the first steel mesh sheets 3091 in the hoisting cover 306 are connected to the second anchor 3063 via second tie bars 3068. Specifically, the first steel mesh sheets 3091 in the first section are connected to the first studs via first tie bars 3092, and the first steel mesh sheets 3091 in the hoisting cover 306 are connected to the second studs via second tie bars 3068, thereby improving the bonding strength between the post-cast concrete area and the pre-cast concrete area. Simultaneously, the first post-cast concrete area 309 and the second post-cast concrete area 3067 are integrally cast, forming smooth curved surfaces on their outer surfaces. This improves the aesthetics of the first section while also enhancing its overall stability.

[0054] Furthermore, after all the main equipment of the steam generator compartment 102 has entered the reactor building and been installed in place, the third steel plate 401 of the second section is welded and fixed to the second side steel plate 202 of the reinforced ring beam 200. The third concrete area of ​​the second section also includes a third post-cast concrete area 406, and the third post-cast concrete area 406 is located above the third pre-cast concrete area 402. A second steel mesh 4061 is provided in the third post-cast concrete area 406, and the second steel mesh 4061 is connected to the third anchor 403 through the third tie rod 4062. Specifically, UHPC concrete is poured above the third pre-cast concrete zone 402 to form a third post-cast concrete zone 406. The second steel mesh 4061 is connected to the third stud via third tie bars 4062 to enhance the bond between the third post-cast concrete zone 406 and the third pre-cast concrete zone 402. Simultaneously, UHPC concrete is poured at the connection between the third steel plate 401 and the reinforcing ring beam 200, forming an integral structure with the third concrete zone of the second section and the first concrete zone of the first section. This increases the overall strength and stiffness of the SMR reactor building roof structure, thereby enhancing the seismic performance of the SMR reactor building. By pouring UHPC concrete above the third pre-cast concrete zone 402 of the second section to form the third post-cast concrete zone 406, the overall strength and stiffness of the second section are enhanced while reducing the thickness of the third concrete zone of the second section, thereby reducing the deadweight of the second section, concrete usage, and material costs.

[0055] like Figures 1 to 4As shown, in a specific embodiment, when the pressure vessel of the reactor compartment 101 enters the reactor building, since only one pressure vessel is hoisted into the circular hoisting port at a time, only one hoisting cover plate 306 needs to be opened. After the equipment is in place, the hoisting cover plate 306 can be used to close the circular hoisting port, so that during the entire construction process, there are fewer weakened parts of the entire roof structure, thereby ensuring the integrity and safety and reliability of the entire roof structure. After all the pressure vessels of the reactor compartment 101 are installed in place, concrete is poured on the outside of the first pre-cast concrete area 302 of the first section to form the first middle-cast concrete area 308 and the first post-cast concrete area 309 of the first section, and concrete is poured above the second pre-cast concrete area 3062 of the hoisting cover plate 306 to form the second middle-cast concrete area 3066 and the second post-cast concrete area 3067 of the hoisting cover plate 306, and the first post-cast concrete area 309 and the second post-cast concrete area 3067 form an integral structure. Simultaneously, while the equipment is entering the reactor building, UHPC concrete is first poured onto the third steel plate 401 of the second section, forming a third pre-cast concrete area 402. This third steel plate 401 is bolted to the second side steel plate 202 of the reinforcing ring beam 200. This reduces the structural deadweight of the second section, facilitates repeated disassembly and installation, and serves as a temporary opening and closing mechanism. Once all evaporator equipment in the steam generator compartment 102 has arrived and been installed, the third steel plate 401 of the second section is welded to the second side steel plate 202 of the reinforcing ring beam 200. Simultaneously, UHPC concrete is poured above the third pre-cast concrete area 402 of the second section, forming a third post-cast concrete area 406. Once the concrete hardens, the reinforcing ring beam 200 and the second section form a single integrated structure.

[0056] Furthermore, during the service period of the small reactor building, the second section can be cut off from the roof structure at the connection position between the reinforced ring beam 200 and the second section, and lifted away as a whole, so that the evaporator equipment of the steam generator compartment 102 can be lifted externally for replacement or external maintenance. After the evaporator equipment is re-lifted into place, the concrete at the cut position of the second section is excavated, and then the cut third steel plate 401 of the second section is welded to the reinforced ring beam 200. At the same time, high-grade concrete is poured densely at the excavated position, and the integrity of the roof structure can be restored after it hardens.

[0057] It should be noted that the roof structure of the small reactor building disclosed in the embodiment of the present invention has a circular lifting opening above the reactor compartment 101 and a temporary lifting cover 306, which can effectively reduce resource waste, shorten construction period, and save construction costs. Moreover, when the roof structure adopts a split dome structure, it not only enriches the shape of the facade of the roof structure, but also, by setting a reinforcing ring beam 200, the second dome has the ability to open large holes in the later stage that the traditional dome structure does not have. In addition, the steel plate UPH concrete structure is adopted, so that the second dome can still achieve good overall stress performance after recovery. The roof structure disclosed in the embodiment of the present invention fully matches the layout characteristics of the multi-module small reactor. Above its evaporator equipment, a structural method with the ability to open in the later stage is reserved, which reduces the manufacturing requirements of the evaporator, thereby reducing the project cost. Of course, the roof structure disclosed in the embodiment of the present invention can also match small reactor buildings with more modular arrangements, where Figure 1 This is only a schematic diagram of some modules and will not be described in detail in this article.

[0058] The terms "first," "second," and the like in the specification, claims, and accompanying drawings of the present invention are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements and may include steps or elements that are not listed.

[0059] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A roof structure for a small reactor building, characterized in that: include: a first subsection, the first subsection comprising a first steel plate (301) and a first concrete area, the first concrete area being arranged outside the first steel plate (301), and a first anchor (303) being arranged on the first steel plate (301) for connecting the first concrete area and the first steel plate (301); A second subsection is arranged above the first subsection, and a reinforcing ring beam (200) is provided at the connection position between the second subsection and the first subsection. The second subsection is connected to the first subsection via the reinforcing ring beam (200), and the reinforcing ring beam (200) is provided with a circulation hole (204) for concrete circulation; The reinforced ring beam (200) comprises a first side steel plate (201) and a second side steel plate (202) arranged opposite to each other, a vertical rib (203) is provided between the first side steel plate (201) and the second side steel plate (202), and the flow hole (204) is provided on the vertical rib (203); The roof structure is a dome structure, and the roof structure comprises a first dome portion (300) and a second dome portion (400), the first dome portion (300) being the first subdivision, the second dome portion (400) being the second subdivision, and the first dome portion (300) and the second dome portion (400) being connected via the reinforced ring beam (200).

2. The roof structure of a small reactor building according to claim 1, characterized in that: UHPC concrete is poured between the first side steel plate (201) and the second side steel plate (202) to improve the strength of the reinforced ring beam (200).

3. The roof structure of a small reactor building according to claim 1, characterized in that: A circular lifting opening is provided on the first section, and the circular lifting opening is arranged in a one-to-one correspondence with the reactor compartment (101) and is used for lifting equipment in the reactor compartment (101). A lifting cover plate (306) is provided at the position of the circular lifting opening and is used for closing the circular lifting opening.

4. The roof structure of a small reactor building according to claim 3, characterized in that: A concrete reinforcement area (307) is provided around the circular lifting opening, and the concrete reinforcement area (307) is formed by pouring UHPC concrete.

5. The roof structure of a small reactor building according to claim 4, characterized in that: The first steel plate (301) of the first section is provided with intersecting first stiffening ribs (304) and second stiffening ribs (305); The lifting cover plate (306) includes a second steel plate (3061) and a second concrete area, wherein the second concrete area is located above the second steel plate (3061), and a second anchor (3063) is provided on the second steel plate (3061) for connecting the second steel plate (3061) and the second concrete area, and the second steel plate (3061) is provided with intersecting third stiffening ribs (3064) and fourth stiffening ribs (3065).

6. The roof structure of a small reactor building according to claim 5, characterized in that: The first concrete area of ​​the first section includes a first precast concrete area (302); the first anchor (303) of the first section is a first bolt, the first bolt is welded to the first steel plate (301) of the first section, and the first bolt extends out of the first precast concrete area (302); The second concrete area of ​​the hoisting cover plate (306) includes a second pre-cast concrete area (3062), and the second anchor (3063) of the hoisting cover plate (306) is a second bolt, which is welded to the second steel plate (3061) of the hoisting cover plate (306), and the second bolt extends out of the second pre-cast concrete area (3062).

7. The roof structure of a small reactor building according to claim 6, characterized in that: The second section includes a third steel plate (401) and a third concrete area, wherein the third concrete area is located above the third steel plate (401), and a third anchor (403) is provided on the third steel plate (401), wherein the third anchor (403) is used to connect the third concrete area and the third steel plate (401), and the third steel plate (401) is provided with intersecting fifth stiffening ribs (404) and sixth stiffening ribs (405).

8. The roof structure of a small reactor building according to claim 7, characterized in that: The third concrete area of ​​the second section includes a third pre-cast concrete area (402), and the third anchor (403) is a third bolt. The third bolt is welded to the third steel plate (401) of the second section, and the third bolt extends out of the third pre-cast concrete area (402).

9. The roof structure of a small reactor building according to claim 8, characterized in that: The first concrete area of ​​the first section further includes a first intermediate concrete area (308) and a first post-cast concrete area (309), wherein the first post-cast concrete area (309) is located outside the first pre-cast concrete area (302), and the first intermediate concrete area (308) is located between the first pre-cast concrete area (302) and the first post-cast concrete area (309); The second concrete area of ​​the hoisting cover plate (306) further includes a second intermediate concrete area (3066) and a second post-cast concrete area (3067), wherein the second post-cast concrete area (3067) is located above the second first-cast concrete area (3062), and the second intermediate concrete area (3066) is located between the second first-cast concrete area (3062) and the second post-cast concrete area (3067). A first steel mesh (3091) is provided in both the first post-cast concrete area (309) and the second post-cast concrete area (3067), and the first steel mesh (3091) of the first section is connected to the first anchor (303) via a first tie bar (3092), and the first steel mesh (3091) of the hoisting cover plate (306) is connected to the second anchor (3063) via a second tie bar (3068); The third concrete area of ​​the second section also includes a third post-cast concrete area (406), wherein a second steel mesh (4061) is provided in the third post-cast concrete area (406), and the second steel mesh (4061) is connected to the third anchor (403) via a third tie rod (4062).

10. The roof structure of a small reactor building according to claim 9, characterized in that: The concrete of the first pre-cast concrete area (302) and the first intermediate cast concrete area (308) are both UHPC concrete; The concrete of the second pre-cast concrete area (3062) and the second intermediate cast concrete area (3066) are both UHPC concrete; The concrete of the third pre-cast concrete area (402) and the third post-cast concrete area (406) are both UHPC concrete; The concrete of the first post-cast concrete area (309) and the second post-cast concrete area (3067) are both ordinary concrete, or the concrete of the first post-cast concrete area (309) and the second post-cast concrete area (3067) are both UHPC concrete.

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