Connection node of steel-concrete composite containment
By installing stiffening rib ring plates connected to longitudinal prestressed steel bars in the steel-concrete composite containment vessel, and combining this with circumferential prestressed tendon tensioning, the problem of unstable connection at the joints of the steel-concrete composite containment vessel was solved, enhancing the overall stiffness and structural stability and preventing nuclear leakage.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE CO LTD
- Filing Date
- 2025-09-30
- Publication Date
- 2026-05-21
AI Technical Summary
In the existing technology, the connection structure at the nodes of the steel-concrete composite containment structure is unstable and easily affected by external forces, leading to structural instability.
By installing stiffening rib ring plates on the steel containment structure and connecting them with the longitudinal prestressed steel bars in the concrete containment structure to form an integral anchorage, and combining this with the tensioning of circumferential prestressed tendons at the buttress columns, the overall stiffness and strength of the connection node are enhanced.
It enhances the overall rigidity and integrity of the containment vessel, ensuring its stability in the event of an accident, and reduces the likelihood of concrete cracking, thus preventing nuclear leakage.
Smart Images
Figure CN2025125937_21052026_PF_FP_ABST
Abstract
Description
A steel-concrete composite containment connection node
[0001] Cross-references to related applications
[0002] This invention claims priority to Chinese Patent Application No. 202411611108.4, filed on November 12, 2024, entitled "A Steel-Concrete Composite Containment Connection Node", the entire contents of which are incorporated herein by reference and constitute a part of this invention for all purposes. Technical Field
[0003] This invention relates to the field of nuclear power technology, and in particular to a steel-concrete composite containment connection node. Background Technology
[0004] The containment structure is a crucial component of the reactor building and serves as the last physical barrier in a nuclear power plant. Compared to traditional containment structures, the hybrid containment shell utilizes prestressed concrete, and its dome employs a double-dome design consisting of a concrete dome and a steel containment top head. This design not only leverages the passive heat dissipation characteristics of the steel containment but also utilizes the concrete dome to support the water tanks and the prestressed concrete shell to withstand impacts from large aircraft. The connection areas of the containment structure often experience high stress, and the steel-concrete composite containment structure inevitably involves the connection issues between the steel containment shell and the prestressed concrete containment shell.
[0005] CN108766595A discloses a novel nuclear containment structure with an externally prestressed steel-concrete composite structure. From the inside out, it consists of three parts: an internal prestressing system, a composite containment structure, and an external prestressing system. The internal prestressing system comprises internal prestressing tendons and internal steel compression members, while the external prestressing system comprises external prestressing tendons and external steel compression members. The composite containment structure consists of an inner steel shell, infill concrete, and an outer steel shell. CN114550954A discloses a nuclear power plant containment structure, including an inner containment structure consisting of an inner shell top and an inner cylinder, and an outer containment structure located outside the inner containment structure. The inner shell top is made of steel, the inner cylinder is made of prestressed reinforced concrete, and the outer containment structure is made of reinforced concrete. Although the above schemes all involve steel-concrete composite containment structures, there is no connecting structure between the inner and outer cylinders at the joints, making them susceptible to instability due to external forces. Summary of the Invention
[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a steel-concrete composite containment structure connection node. Through the combined action of stiffening ribs on the steel containment structure and prestressed tendons in the concrete containment structure, the overall rigidity of the containment structure is enhanced, ensuring the integrity of the containment structure in the event of an accident.
[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:
[0008] An embodiment of the present invention provides a steel-concrete composite containment connection node, wherein a steel containment cylinder is embedded in the concrete of a prestressed concrete containment cylinder, the steel containment cylinder is provided with stiffening rib ring plates, and the longitudinal prestressed steel bars in the prestressed concrete containment cylinder are connected to the stiffening rib ring plates; the longitudinal prestressed steel bars are tensioned in the bottom corridor of the prestressed concrete containment cylinder to form a tensioning corridor; circumferential prestressed tendons are also provided in the concrete of the prestressed concrete containment cylinder, and the circumferential prestressed tendons are tensioned at the buttress columns.
[0009] As a further implementation, the longitudinal prestressed steel bars pass through the stiffening rib ring plate and are welded to it to form an integral anchorage.
[0010] As a further implementation, the stiffening rib ring plate is spliced in segments along the circumferential direction to form a whole, and then welded and fixed to the steel containment shell.
[0011] As a further implementation, the stiffening rib ring plate includes an inner stiffening rib ring plate fixed to the inside of the steel containment shell cylinder and an outer stiffening rib ring plate fixed to the outside of the steel containment shell cylinder.
[0012] As a further implementation, the inner stiffening rib ring plate and the outer stiffening rib ring plate are arranged inside and outside the steel containment shell, respectively. Multiple inner stiffening rib vertical stiffening plates are connected between the inner stiffening rib ring plates of the containment shell, and multiple outer stiffening rib vertical stiffening plates are connected between the outer stiffening rib ring plates of the containment shell.
[0013] As a further implementation, the gap between the steel containment shell and the prestressed concrete containment shell is filled with a sealing material.
[0014] As a further implementation, the longitudinal prestressed steel bars are arranged in a single layer or multiple layers;
[0015] When the longitudinal prestressed steel bars are set in a single layer, the steel safety shell is changed from direct longitudinal prestressed anchorage to anchor bar anchorage.
[0016] As a further implementation, the longitudinal prestressed steel bars are replaced with anchor bolts, and corbels are installed in the anchorage section.
[0017] As a further implementation, the longitudinal prestressed steel bars are replaced with anchor bars.
[0018] As a further implementation, the prestressed concrete containment shell is replaced with a high-strength concrete + steel plate concrete structure.
[0019] The beneficial effects of this invention are as follows:
[0020] (1) The steel containment shell of the present invention is embedded in the concrete of the prestressed concrete containment shell. The longitudinal prestressed steel bars in the prestressed concrete containment shell are connected to the stiffening rib ring plate of the steel containment shell. The longitudinal prestressed steel bars are tensioned in the bottom corridor of the concrete containment shell, which ensures a stable connection between the steel containment shell and the prestressed concrete containment shell, enhances the overall rigidity of the containment shell, and ensures the integrity of the containment shell in the event of an accident. At the same time, circumferential prestressed tendons are also provided. The circumferential prestressed tendons are tensioned at the buttress columns, which, together with the longitudinal prestressed steel bars, further enhance the structural strength. Moreover, through the joint action of the stiffening ribs on the steel containment shell and the prestressed tendons in the concrete containment shell, the force is directly transmitted and the force is reasonable. Under the action of the prestressing system, the concrete, steel bars, and steel lining of the containment shell jointly bear the prestressing effect. The stiffening rib vertical plate of the steel containment shell directly bears the tensile force, which reduces the possibility of cracking of the concrete in the concrete containment shell.
[0021] (2) The containment shell stiffening ribs of the present invention include inner and outer stiffening ribs. Multiple horizontal ring plates, vertical stiffening plates, longitudinal and circumferential prestressed steel bars can be set according to stiffness requirements to enhance the overall stress performance of the connection node. The gap between the prestressed concrete containment shell and the steel containment shell in the node area is filled with sealing material to further prevent nuclear leakage. Attached Figure Description
[0022] The accompanying drawings, which form part of this invention, 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 improper limitation of the invention.
[0023] Figure 1 is a schematic diagram of the steel-concrete composite containment structure of Embodiment 1 of the present invention;
[0024] Figure 2 is a partial enlarged view of the connection node between the steel containment shell and the prestressed concrete containment shell cylinder in Embodiment 1 of the present invention;
[0025] Figure 3 is a partial enlarged view of the connection node between the steel containment shell and the prestressed concrete containment shell cylinder in Embodiment 2 of the present invention.
[0026] Figure 4 is a schematic diagram of the steel-concrete composite containment structure of Embodiment 3 of the present invention.
[0027] Among them, 1-concrete dome, 2-steel containment head, 3-anchor bar, 4-bracket, 5-sealing material, 6-anchoring section, 7-tensioning corridor, 8-foundation anchor bolt, 9-longitudinal prestressing tendon, 10-concrete, 11-circumferential prestressing tendon, 12-prestressed concrete containment shell cylinder, 13-steel containment shell cylinder, 14-steel lining, 15-outer stiffening rib horizontal ring plate, 16-inner stiffening rib horizontal ring plate, 17-inner stiffening rib vertical stiffening plate, 18-outer stiffening rib vertical stiffening plate, 19-concrete containment shell cylinder. Detailed Implementation
[0028] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0029] Example 1:
[0030] The steel-concrete composite containment structure includes a steel containment structure and a concrete containment structure, with the steel containment structure located inside the concrete containment structure. The connection area between the two is the node area. This embodiment provides a connection node for the steel-concrete composite containment structure. The steel containment structure cylinder 13 is embedded in the concrete 10 inside the prestressed concrete containment structure cylinder 12. It is connected to the stiffening rib ring plate of the steel containment structure cylinder 13 through the longitudinal prestressed steel bars inside the prestressed concrete containment structure cylinder 12. The longitudinal prestressed steel bars are tensioned in the bottom corridor of the concrete containment structure to ensure a stable connection between the steel containment structure and the concrete containment structure, enhance the overall rigidity of the containment structure, and ensure the integrity of the containment structure even in the event of an accident.
[0031] Specifically, as shown in Figures 1-3, the steel containment includes a steel containment cylinder 13, with a steel containment head 2 installed on the top of the steel containment cylinder 13; the concrete containment includes a concrete containment cylinder 19 and a prestressed concrete containment cylinder 12, with a concrete dome 1 installed on the top of the concrete containment cylinder 19.
[0032] The prestressed concrete safety shell 12 includes a steel lining 14, which is filled with concrete 10. Prestressed steel bars are installed in the concrete 10. The prestressed steel bars include longitudinal prestressed steel bars and circumferential prestressed steel bars. Multiple longitudinal and circumferential prestressed steel bars are provided and evenly distributed in the filling concrete 10. The longitudinal prestressed steel bars 9 are tensioned at the bottom corridor, and the circumferential prestressed steel bars are tensioned at the buttress columns.
[0033] The steel containment shell 13 is embedded within the prestressed concrete containment shell 12 and securely connected at the joint area. As shown in Figure 2, the steel containment shell 13 is connected with stiffening ribs, including inner stiffening ribs and outer stiffening ribs. The inner stiffening ribs include inner stiffening rib horizontal ring plates 16 and inner stiffening rib vertical stiffening plates 17. The inner stiffening rib horizontal ring plates 16 are arranged in two layers, spaced apart vertically, and the two layers of inner stiffening rib horizontal ring plates 16 are connected by multiple inner stiffening rib vertical stiffening plates 17. The outer stiffening ribs include outer stiffening rib horizontal ring plates 15 and outer stiffening rib vertical stiffening plates 18. The outer stiffening rib horizontal ring plates 15 are arranged in two layers, spaced apart vertically, and the two layers of outer stiffening rib horizontal ring plates 15 are connected by multiple outer stiffening rib vertical stiffening plates 18. The inner stiffening rib horizontal ring plate 16 is welded to the inner side of the steel containment shell 13, and the outer stiffening rib horizontal ring plate 15 is welded to the outer side of the steel containment shell 13. The inner stiffening rib horizontal ring plate 16 and the outer stiffening rib horizontal ring plate 15 are respectively spliced into a whole along the circumferential direction and welded to the steel containment shell 13 to facilitate construction and installation.
[0034] The inner stiffening rib horizontal ring plate 16 and the outer stiffening rib horizontal ring plate 15 are provided with openings according to the arrangement of the longitudinal prestressed steel bars. The upper inner stiffening rib horizontal ring plate 16 and the lower inner stiffening rib horizontal ring plate 16 are passed through by the corresponding longitudinal prestressed steel bars in sequence, and the upper outer stiffening rib horizontal ring plate 15 and the lower outer stiffening rib horizontal ring plate 15 are passed through by the corresponding longitudinal prestressed steel bars in sequence; that is, this embodiment is provided with double-layer longitudinal prestressed steel bars. It should be noted that, for the case of using single-layer longitudinal prestressed steel bars, the steel containment shell is changed from direct longitudinal prestressed anchorage to anchor bar anchorage.
[0035] In this embodiment, the longitudinal prestressed steel bars are welded and fixed to the corresponding horizontal ring plates to form an integral anchorage; each horizontal ring plate is embedded in the concrete 10. The longitudinal prestressed steel bars are tensioned in the bottom gallery of the concrete containment vessel to form a tensioning gallery 7, which ensures a stable connection between the steel containment vessel and the prestressed concrete containment vessel cylinder 12, enhances the overall rigidity of the containment vessel, and ensures the integrity of the containment vessel in the event of an accident.
[0036] According to actual needs, the steel safety shell cylinder 13 can be equipped with multiple stiffening ribs, horizontal ring plates, vertical stiffening plates, longitudinal prestressed steel bars 9 and circumferential prestressed steel bars 11 in the longitudinal direction to enhance the overall stress performance of the connection nodes.
[0037] In this embodiment, the steel containment vessel, the horizontal stiffening ring plate, and the vertical stiffening plate are all made of special boiler steel; the gap between the prestressed concrete containment vessel cylinder 12 and the steel containment vessel in the node area is filled with sealing material 5 to further prevent nuclear leakage. In this embodiment, a prestressed concrete containment vessel cylinder 12 is used. It is understood that in other embodiments, the prestressed concrete containment vessel cylinder 12 can be replaced with a high-strength concrete 10 + steel plate concrete structure.
[0038] This embodiment combines two different systems: a concrete containment structure and a steel containment structure. Through the combined action of the stiffening ribs on the steel containment structure and the prestressed tendons in the concrete containment structure, force transmission is direct and the stress distribution is reasonable. The concrete containment structure utilizes the thermal inertia of concrete 10 and the high strength of prestressed steel, making it suitable for resisting the high temperature and pressure generated inside the containment structure during a loss-of-water accident in a nuclear power plant. Under the action of the prestressing system, concrete 10, steel bars, and steel lining 14 jointly bear the prestressing effect. Meanwhile, the stiffening ribs of the steel containment structure directly bear the tensile force, reducing the possibility of cracking in the concrete 10 within the concrete containment structure. Therefore, when the steel containment cylinder 13 is embedded and connected within the prestressed concrete containment cylinder 12, the connection through the stiffening ribs, longitudinal prestressed steel bars 9, and circumferential prestressed steel bars 11 further enhances the overall integrity of the containment structure, solving the connection problem between the steel containment structure and the prestressed concrete containment cylinder 12 in the combined containment structure.
[0039] Example 2:
[0040] This embodiment provides a steel-concrete composite containment connection node, as shown in Figure 3. The difference between this embodiment and Embodiment 1 is that: anchor bolts 8 are used instead of longitudinal prestressing tendons 9. The anchor bolts 8 are set in the anchoring section 6 of the steel containment cylinder and the prestressed concrete containment cylinder 12, and brackets 4 are set in the anchoring section 6. The brackets 4 are set towards the inside of the steel lining 14 to enhance the stability of the node.
[0041] Example 3:
[0042] This embodiment provides a steel-concrete composite containment connection node, as shown in Figure 4. The difference between this embodiment and Embodiment 1 is that anchor bars 3 are used to replace longitudinal prestressed tendons 9 to achieve the connection between the prestressed concrete containment shell 12 and the steel containment shell 13.
[0043] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A connection node for a steel-concrete composite containment structure, characterized in that, A steel containment shell is embedded in the concrete of a prestressed concrete containment shell. The steel containment shell is provided with stiffening rib ring plates, and the longitudinal prestressed steel bars in the prestressed concrete containment shell are connected to the stiffening rib ring plates. The longitudinal prestressed steel bars are tensioned in the bottom corridor of the prestressed concrete containment shell to form a tensioning corridor. Circumferential prestressed tendons are also provided in the concrete of the prestressed concrete containment shell, and the circumferential prestressed tendons are tensioned at the buttress columns.
2. The steel-concrete composite containment connection node according to claim 1, characterized in that, The longitudinal prestressed steel bars pass through the stiffening rib ring plate and are welded to it to form an integral anchorage.
3. A steel-concrete composite containment connection node according to claim 1, characterized in that, The stiffening rib ring plates are spliced together in sections along the circumferential direction to form a whole, and are welded and fixed to the steel safety shell cylinder.
4. A steel-concrete composite containment connection node according to any one of claims 1-3, characterized in that, The stiffening rib plate includes an inner stiffening rib plate fixed to the inside of the steel containment shell and an outer stiffening rib plate fixed to the outside of the steel containment shell.
5. A steel-concrete composite containment connection node according to claim 4, characterized in that, The inner stiffening rib ring plates and outer stiffening rib ring plates are arranged inside and outside the steel containment vessel, respectively. Multiple inner stiffening rib longitudinal stiffening plates are connected between the inner stiffening rib ring plates of the containment vessel, and multiple outer stiffening rib longitudinal stiffening plates are connected between the outer stiffening rib ring plates of the containment vessel.
6. A steel-concrete composite containment connection node according to claim 1, characterized in that, The gap between the steel containment shell and the prestressed concrete containment shell is filled with sealing material.
7. A steel-concrete composite containment connection node according to claim 1 or 2, characterized in that, The longitudinal prestressed steel bars are arranged in a single layer or multiple layers; When the longitudinal prestressed steel bars are set in a single layer, the steel safety shell is changed from direct longitudinal prestressed anchorage to anchor bar anchorage.
8. A steel-concrete composite containment connection node according to claim 1, characterized in that, The longitudinal prestressed steel bars were replaced with anchor bolts, and corbels were installed in the anchorage section.
9. A steel-concrete composite containment connection node according to claim 1, characterized in that, The longitudinal prestressed steel bars were replaced with anchor bars.
10. A steel-concrete composite containment connection node according to claim 1, characterized in that, The prestressed concrete containment shell was replaced with a high-strength concrete + steel plate concrete structure.