Steel-concrete composite containment connection node

Abstract

The invention discloses a steel-concrete combined containment connection node, and relates to the technical field of nuclear power, a steel containment cylinder is embedded into concrete in a prestressed concrete containment cylinder, the steel containment cylinder is provided with a stiffening rib ring plate, and longitudinal prestressed reinforcements in the prestressed concrete containment cylinder are connected with the stiffening rib ring plate; the longitudinal prestressed reinforcements are tensioned at the bottom ring corridor of the prestressed concrete containment cylinder to form a tensioning corridor; and circumferential prestressed tendons are also arranged in the concrete of the prestressed concrete containment cylinder, and are tensioned at the buttress columns. Through the combined action of the stiffening ribs on the steel containment and the prestressed tendons in the concrete containment, the overall rigidity of the containment is enhanced, and the integrity of the containment is guaranteed under the condition that an accident occurs.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power, and in particular to a steel-concrete combined containment connection node. Background Art

[0002] The containment is an important part of the reactor building and the last physical barrier of a nuclear power plant. Compared with the traditional containment form, the hybrid containment cylinder adopts prestressed concrete, and the dome adopts a double dome design of concrete dome + steel containment top head, which can not only realize the passive heat dissipation characteristics of the steel containment, but also use the concrete dome to bear the water tank and the prestressed concrete cylinder to resist the impact of large aircraft. The connection area of ​​the containment is often under high stress, and the steel-concrete composite containment inevitably involves the connection problem between the steel containment and the prestressed concrete containment cylinder.

[0003] CN108766595A discloses a novel structure of an external prestressed steel-concrete composite nuclear containment shell, which is composed of three parts from the inside to the outside, namely, a prestressed system inside the shell, a composite structure containment shell, and a prestressed system outside the shell. The prestressed system inside the shell is composed of inner prestressed tendons and inner steel compression rods, and the prestressed system outside the shell is composed of outer prestressed tendons and outer steel compression rods. The composite structure containment shell is composed of an inner steel shell, filled concrete, and an outer steel shell. CN114550954A discloses a nuclear power plant containment shell structure, including an inner containment shell composed of an inner shell top and an inner cylinder, and an outer containment shell arranged outside the inner containment shell. The material of the inner shell top is steel, the material of the inner cylinder is prestressed reinforced concrete, and the material of the outer containment shell is reinforced concrete. Although the above schemes all involve a steel-concrete composite containment shell structure, there is no connection structure between the inner and outer cylinders at the nodes, which is easily affected by external forces and leads to structural instability. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a steel-concrete composite containment connection node, which, through the combined action of stiffening ribs on the steel containment and prestressed tendons in the concrete containment, enhances the overall stiffness of the containment and ensures the integrity of the containment in the event of an accident.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] An embodiment of the present invention provides a steel-concrete composite containment connection node, wherein a steel containment cylinder is embedded in the concrete inside a prestressed concrete containment cylinder, the steel containment cylinder is provided with a stiffening rib ring plate, and the longitudinal prestressed steel bars inside the prestressed concrete containment cylinder are connected to the stiffening rib ring plate; the longitudinal prestressed steel bars are tensioned in a ring corridor at the bottom of the prestressed concrete containment cylinder to form a tensioning corridor; annular prestressed tendons are also provided in the concrete of the prestressed concrete containment cylinder, and the annular prestressed tendons are tensioned at the buttress columns.

[0007] As a further implementation method, the longitudinal prestressed steel bars pass through the stiffening rib ring plate and are welded and fixed thereto to form an integral anchoring.

[0008] As a further implementation method, the stiffening rib ring plate is spliced ​​in sections along the annular direction to form a whole, and is welded and fixed to the steel containment shell.

[0009] As a further implementation, the stiffening rib ring plate includes an inner stiffening rib ring plate fixed to the inner side of the steel containment shell body and an outer stiffening rib ring plate fixed to the outer side of the steel containment shell body.

[0010] As a further implementation method, the inner stiffening rib ring plates and the outer stiffening rib ring plates are arranged inside and outside the steel containment shell respectively, a plurality of inner stiffening rib vertical stiffening plates are connected between the inner stiffening rib ring plates of the containment shell, and a plurality of outer stiffening rib vertical stiffening plates are connected between the outer stiffening rib ring plates of the containment shell.

[0011] As a further implementation, the gap between the node area of ​​the steel containment shell and the prestressed concrete containment shell is filled with sealing material.

[0012] As a further implementation, the longitudinal prestressed steel bars are provided in a single layer or multiple layers;

[0013] When the longitudinal prestressed steel bars are arranged in a single layer, the steel containment shell is anchored by anchor bars instead of being directly anchored by longitudinal prestressed steel bars.

[0014] As a further implementation, the longitudinal prestressed steel bars are replaced with anchor bolts, and corbels are provided in the anchoring sections.

[0015] As a further implementation, the longitudinal prestressed steel bars are replaced by anchor bars.

[0016] As a further implementation method, the prestressed concrete containment shell is replaced by a high-strength concrete + steel plate concrete structure.

[0017] The beneficial effects of the present invention are as follows:

[0018] (1) The steel containment cylinder of the present invention is embedded in the concrete inside the prestressed concrete containment cylinder, and is connected to the steel containment cylinder stiffening rib ring plate through the longitudinal prestressed steel bars inside the prestressed concrete containment cylinder, and the longitudinal prestressed steel bars are tensioned in the bottom ring corridor of the concrete containment, thereby ensuring that the steel containment is firmly connected to the prestressed concrete containment cylinder, enhancing the overall rigidity of the containment, and ensuring the integrity of the containment in the event of an accident; at the same time, annular prestressed tendons are also provided, and the annular prestressed tendons are tensioned at the buttress columns, and cooperate with the longitudinal prestressed steel bars to further enhance the structural strength; and through the joint action of the stiffening ribs on the steel containment and the prestressed tendons in the concrete containment, the force is transmitted directly and the force is reasonably received; under the action of the prestressed system, the concrete, steel bars and steel lining of the containment jointly bear the role of prestress; and the steel containment stiffening rib vertical plates directly bear the tensile force, thereby reducing the possibility of concrete cracking in the concrete containment.

[0019] (2) The stiffening ribs of the containment shell of the present invention include inner and outer stiffening ribs. A plurality of horizontal ring plates, vertical stiffening plates, longitudinal and annular prestressed steel bars can be provided according to the stiffness requirements to enhance the overall bearing capacity of the connection node. The gap between the prestressed concrete containment shell and the steel containment in the node area is filled with sealing material to further prevent nuclear leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 Schematic diagram of the steel-concrete composite containment structure of Example 1 of the present invention;

[0022] Figure 2 It is a partial enlarged view of the connection node between the steel containment shell and the prestressed concrete containment shell cylinder of Example 1 of the present invention;

[0023] Figure 3 It is a partial enlarged view of the connection node between the steel containment shell and the prestressed concrete containment shell cylinder of Example 2 of the present invention;

[0024] Figure 4 It is a schematic diagram of the steel-concrete composite containment structure of Example 3 of the present invention.

[0025] Among them, 1-concrete dome, 2-steel containment head, 3-anchor reinforcement, 4-corbel, 5-sealing material, 6-anchor section, 7-tensioning gallery, 8-ground anchor bolts, 9-longitudinal prestressed tendons, 10-concrete, 11-circumferential prestressed tendons, 12-prestressed concrete containment cylinder, 13-steel containment cylinder, 14-steel lining, 15-external stiffening rib horizontal ring plate, 16-internal stiffening rib horizontal ring plate, 17-internal stiffening rib vertical stiffening plate, 18-external stiffening rib vertical stiffening plate, 19-concrete containment cylinder. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0027] Embodiment 1:

[0028] The steel-concrete composite containment shell includes a steel containment shell and a concrete containment shell. The steel containment shell is arranged on the inner side of the concrete containment shell, and the connection area between the two is the node area. The present embodiment provides a steel-concrete composite containment shell connection node. The steel containment shell cylinder 13 is embedded in the concrete 10 in the prestressed concrete containment shell cylinder 12, and is connected to the stiffening rib ring plate of the steel containment shell cylinder 13 through the longitudinal prestressed steel bars in the prestressed concrete containment shell cylinder 12. The longitudinal prestressed steel bars are tensioned in the bottom ring corridor of the concrete containment shell to ensure that the steel containment shell is firmly connected to the concrete containment shell, enhance the overall stiffness of the containment shell, and ensure that the integrity of the containment shell can be guaranteed even in the event of an accident.

[0029] Specifically, Figure 1-Figure 3 As shown, the steel containment shell includes a steel containment shell cylinder 13, and a steel containment shell head 2 is installed on the top of the steel containment shell cylinder 13; the concrete containment shell includes a concrete containment shell cylinder 19 and a prestressed concrete containment shell cylinder 12, and a concrete dome 1 is installed on the top of the concrete containment shell cylinder 19.

[0030] The prestressed concrete containment shell 12 includes a steel lining 14, which is filled with concrete 10, and prestressed steel bars are arranged in the concrete 10; the prestressed steel bars include longitudinal prestressed steel bars and annular prestressed steel bars, and a plurality of longitudinal prestressed steel bars and annular prestressed steel bars are provided and evenly arranged in the filled concrete 10, the longitudinal prestressed steel bars 9 are tensioned at the bottom gallery, and the annular prestressed steel bars are tensioned at the buttress columns.

[0031] The steel containment shell 13 is embedded in the prestressed concrete containment shell 12 and is firmly connected in the node area; Figure 2As shown, the steel containment shell 13 is connected with stiffening ribs, and the stiffening ribs include inner stiffening ribs and outer stiffening ribs, wherein the inner stiffening ribs include inner stiffening rib horizontal ring plates 16 and inner stiffening rib vertical stiffening plates 17, and the inner stiffening rib horizontal ring plates 16 are arranged in two layers with upper and lower intervals, 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, and the outer stiffening rib horizontal ring plates 15 are arranged in two layers with upper and lower intervals, 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 in circumferential sections and welded to the steel containment shell 13, which is convenient for construction and installation.

[0032] 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, and the upper inner stiffening rib horizontal ring plate 16 and the lower inner stiffening rib horizontal ring plate 16 are sequentially penetrated by the corresponding longitudinal prestressed steel bars, and the upper outer stiffening rib horizontal ring plate 15 and the lower outer stiffening rib horizontal ring plate 15 are sequentially penetrated by the corresponding longitudinal prestressed steel bars; that is, this embodiment is provided with double-layer longitudinal prestressed steel bars. It should be noted that in the case of using a single-layer longitudinal prestressed steel bar, the steel containment is changed from being directly anchored with longitudinal prestressed steel bars to being anchored with anchor bars.

[0033] The longitudinal prestressed steel bars of this embodiment 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 gallery at the bottom of the concrete containment to form a tensioning gallery 7 to ensure that the steel containment is firmly connected to the prestressed concrete containment cylinder 12, enhance the overall rigidity of the containment, and ensure the integrity of the containment in the event of an accident.

[0034] According to actual needs, a plurality of stiffening rib horizontal ring plates, vertical stiffening plates, longitudinal prestressed steel bars 9 and annular prestressed steel bars 11 may be provided longitudinally of the steel containment shell 13 to enhance the overall stress performance of the connection node.

[0035] In this embodiment, the steel containment shell, the horizontal ring plate with stiffening ribs, and the vertical longitudinal stiffening plate are all made of special boiler steel; the gap between the prestressed concrete containment shell cylinder 12 and the steel containment shell in the node area is filled with sealing material 5, which can further prevent nuclear leakage. In this embodiment, the prestressed concrete containment shell cylinder 12 is used. It can be understood that in other embodiments, the prestressed concrete containment shell cylinder 12 can be replaced by a high-strength concrete 10+steel plate concrete structure.

[0036] This embodiment combines two different systems, concrete containment and steel containment, together, and through the joint action of the stiffening ribs on the steel containment and the prestressed tendons in the concrete containment, the force transmission is direct and the force is reasonable; the concrete containment utilizes the inertia of the heat conduction of the concrete 10 and the high strength of the prestressed steel, so that the concrete containment structure is suitable for resisting the high temperature and high pressure generated inside the containment in the event of a loss of water accident in a nuclear power plant; under the action of the prestressed system, the concrete 10, the steel bars, and the steel lining 14 of the containment jointly bear the role of prestress; and the steel containment stiffening rib vertical plate directly bears the tensile force, reducing the possibility of cracking of the concrete 10 in the concrete containment. Therefore, when the steel containment cylinder 13 is embedded in the prestressed concrete containment cylinder 12 and connected, the integrity of the containment is further enhanced through the connection of the stiffening ribs, the longitudinal prestressed steel bars 9, and the annular prestressed steel bars 11, solving the connection problem between the steel containment and the prestressed concrete containment cylinder 12 in the combined containment.

[0037] Embodiment 2:

[0038] This embodiment provides a steel-concrete composite containment connection node, such as Figure 3 As shown, the difference from Example 1 is that anchor bolts 8 are used instead of longitudinal prestressed tendons 9, the anchor bolts 8 are arranged in the anchoring sections 6 of the steel containment cylinder and the prestressed concrete containment cylinder 12, and a corbel 4 is arranged in the anchoring section 6, and the corbel 4 is arranged toward the inner side of the steel lining 14 to enhance the stability at the node.

[0039] Embodiment 3:

[0040] This embodiment provides a steel-concrete composite containment connection node, such as Figure 4 As shown, the difference from Example 1 is that anchor bars 3 are used instead of longitudinal prestressed bars 9 to achieve the connection between the prestressed concrete containment shell cylinder 12 and the steel containment shell cylinder 13.

[0041] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A steel-concrete composite containment connection node, characterized in that: The steel containment shell is embedded in the concrete in the prestressed concrete containment shell, the steel containment shell is provided with a stiffening rib ring plate, and the longitudinal prestressed steel bars in the prestressed concrete containment shell are connected to the stiffening rib ring plate; the longitudinal prestressed steel bars are tensioned in the annular corridor at the bottom of the prestressed concrete containment shell to form a tensioning corridor; the concrete of the prestressed concrete containment shell is also provided with annular prestressed tendons, and the annular prestressed tendons are tensioned at the buttress columns.

2. A 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 and fixed thereto to form an integral anchoring.

3. A steel-concrete composite containment connection node according to claim 1, characterized in that: The stiffening rib ring plate is spliced ​​in sections along the annular direction to form a whole, and is welded and fixed to the steel containment shell.

4. A steel-concrete composite containment connection node according to any one of claims 1 to 3, characterized in that: The stiffening rib ring plate comprises an inner stiffening rib ring plate fixed to the inner side of the steel containment shell body and an outer stiffening rib ring plate fixed to the outer side of the steel containment shell body.

5. A steel-concrete composite containment connection node according to claim 4, characterized in that: The inner stiffening rib ring plates and the outer stiffening rib ring plates are arranged inside and outside the steel containment shell respectively; a plurality of inner stiffening rib longitudinal stiffening plates are connected between the inner stiffening rib ring plates of the containment shell, and a plurality of outer stiffening rib longitudinal stiffening plates are connected between the outer stiffening rib ring plates of the containment shell.

6. A steel-concrete composite containment connection node according to claim 1, characterized in that: The gap between the node area of ​​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 arranged in a single layer, the steel containment shell is anchored by anchor bars instead of being directly anchored by longitudinal prestressed steel bars.

8. The steel-concrete composite containment connection node according to claim 1, characterized in that: The longitudinal prestressed steel bars are replaced with ground anchor bolts, and corbels are provided at the anchoring sections.

9. The steel-concrete composite containment connection node according to claim 1, characterized in that: The longitudinal prestressed steel bars are replaced by anchor bars.

10. A steel-concrete composite containment connection node according to claim 1, characterized in that: The prestressed concrete containment shell is replaced by a high-strength concrete + steel plate concrete structure.

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