WO2022257312A1

WO2022257312A1 - Composite seismic isolation and absorption system for nuclear island structure

Info

Publication number: WO2022257312A1
Application number: PCT/CN2021/123484
Authority: WO
Inventors: 杨杰; 黄小林; 豆燚; 李韶平; 葛鸿辉; 褚濛; 孙渝刚
Original assignee: 上海核工程研究设计院有限公司
Priority date: 2021-06-11
Filing date: 2021-10-13
Publication date: 2022-12-15
Also published as: CN216475686U; BR112023025549A2

Abstract

The present invention provides a composite seismic isolation and absorption system for a nuclear island structure, comprising: a box body having a box body bottom plate and a box body side wall, the nuclear island structure being placed in the box body, and the nuclear island structure having a nuclear island structure bottom plate and a nuclear island structure side wall; a plurality of seismic isolation supports placed between the box body bottom plate and the nuclear island structure bottom plate; and a plurality of seismic absorption devices placed between the box body side wall and the nuclear island structure side wall. The composite seismic isolation and absorption system for a nuclear island structure of the present invention greatly improves the safety of the nuclear island structure under the action of earthquakes and the ability to resist earthquakes.

Description

Composite shock isolation system for nuclear island structure

technical field

The invention relates to the technical field of nuclear power structures, in particular to a nuclear island structure composite shock-isolation and shock-absorbing system.

Background technique

In recent years, small nuclear reactor power plants have gradually been favored by various countries due to their various advantages. The United States, Russia, and my country have gradually invested more manpower, material resources, and financial resources in the research and development of various types of reactors to improve the country's own energy security. Since the construction of small reactor power plants is mainly to meet the energy needs of civilians and military in different regions, the site selection of small reactor nuclear power plants often encounters very complex geological conditions, which brings great challenges to standardized design. In order to reduce the design cost, improve the site adaptability of the standard design, and improve the overall safety of nuclear power plants, some foreign small reactors adopt a deep-buried, seismic-isolation design scheme, that is, part of the structure of the nuclear island is buried below the surface and seismic isolation devices are installed on the base. .

The traditional seismic isolation design method usually adds a less rigid seismic isolation support at the bottom of the structure to change the overall dynamic characteristics of the structure, thereby reducing the response of the structure under earthquake action. Most of the existing isolation engineering design cases are dedicated to the control of horizontal earthquakes. However, a large number of strong earthquake observation records and earthquake damage records show that in high-intensity areas, the impact of the vertical component of earthquake motion on special structures such as nuclear power plants cannot be ignored.

Many scholars at home and abroad have carried out research on three-dimensional seismic isolation technology, and proposed thick rubber three-dimensional seismic isolation bearings, laminated rubber + disc spring combined three-dimensional seismic isolation bearings, air spring rubber pad three-dimensional seismic isolation bearings and other schemes. However, most seismic isolation bearings achieve the purpose of three-dimensional isolation by reducing the vertical stiffness. Under the action of vertical and horizontal coupled earthquakes, due to the asymmetry of the stiffness of the upper structure of the bearing and the incomplete coincidence of the center of mass and the center of rigidity, the use of the above-mentioned three-dimensional isolation bearing will cause a large rocking motion of the structure, giving the support Very serious damage to seats and structures.

Therefore, there is a special need for a nuclear island structure composite shock-isolation and shock-absorbing system to solve the above-mentioned existing problems.

Contents of the invention

The invention provides a composite shock-isolation and shock-absorbing system of a nuclear island structure, which solves the problem of swinging and overturning of the nuclear island structure and improves the seismic capacity of the nuclear island structure.

The nuclear island structure composite seismic isolation and shock absorption system of the present invention includes: a box body, which has a box body bottom plate and a box body side wall, the nuclear island structure is placed in the box body, and the nuclear island structure has a nuclear island structure The bottom plate and the side wall of the nuclear island structure; several shock-isolation supports placed between the bottom plate of the box body and the bottom plate of the nuclear island structure; and several shock absorbing devices placed between the side wall of the box body and the nuclear island between the structural side walls.

Preferably, the shock absorbing device is a vertical shock absorbing device and/or a horizontal shock absorbing device.

Preferably, the horizontal damping device is respectively connected to the side wall of the box body and the side wall of the nuclear island structure.

Preferably, the upper part of the side wall of the nuclear island structure is provided with an upper outrigger cantilever beam, the middle part of the side wall of the box is provided with a middle outrigger cantilever beam, and the vertical shock absorbing device is connected with the upper part respectively. The outrigger cantilever beam is connected to the middle outrigger cantilever beam.

Preferably, a bottom outrigger cantilever beam is provided on the bottom of the side wall of the nuclear island structure or on the bottom plate of the nuclear island structure, and a cantilever beam is connected between the middle outrigger cantilever beam and the bottom outrigger cantilever beam. The vertical damping device.

Preferably, the damping device adopts a hydraulic viscous damper or a tension-compression two-way damping damping device.

Preferably, the side wall of the box is a cantilever type retaining wall structure or an anchor pull type retaining wall structure.

Preferably, the bottom plate of the box body is a flat structure, a beam-slab structure or a pile-raft structure.

Preferably, the bottom of the box is provided with foundation piles.

Preferably, the foundation piles are prefabricated piles or cast-in-situ piles.

Compared with the prior art, the nuclear island structure composite shock-isolation and shock-absorbing system of the present invention uses the box as an additional radiation protection structure to reduce the risk of nuclear fuel leakage; based on the layout characteristics of the deep-buried structure, the shock-isolation support and the shock-absorbing device are combined Use, learn from each other, greatly improve the safety of the nuclear island structure under the action of earthquakes and the ability to resist earthquakes; the layout of the seismic isolation system comprehensively considers the quality and stiffness distribution characteristics of the nuclear island structure, and reduces the nuclear island structure by overlapping the center of mass and rigid center Torsional movement under the action of earthquakes; the spatial layout of the shock absorption system meets the stress and deformation characteristics of the nuclear island structure, minimizing the swing effect and vertical response; greatly improving the site adaptability of small reactor power plants, which can be used in complex geology Construction of power stations under certain conditions; to achieve standardized design of small reactor power plants, for different plant sites, only the isolation and damping systems need to be re-evaluated, greatly shortening the power plant design cycle and reducing design costs.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

FIG. 1 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a second embodiment of the present invention;

3 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a third embodiment of the present invention;

4 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a fourth embodiment of the present invention;

FIG. 5 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a fifth embodiment of the present invention.

In the drawings, the drawings are not drawn to scale.

Mark Description:

10-cabinet;

11-box bottom plate;

111 - foundation pile;

12-box side wall;

121 - the arm of the box side wall;

122- middle outrigger cantilever beam;

123 - anchor cable;

20 - nuclear island structure;

21-Nuclear island structure bottom plate;

22- Nuclear island structure side wall;

201-upper outrigger cantilever beam;

202-bottom outrigger cantilever beam;

30-shock isolation bearing;

40 - shock absorber;

401-vertical damping device;

402-horizontal damping device.

Detailed ways

The implementation manner of the present application will be further described in detail below with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to illustrate the principles of the application, but not to limit the scope of the application, that is, the application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is more than two; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" and so on are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to this application. Application Restrictions.

The orientation words appearing in the following description are the directions shown in the figure, and do not limit the specific structure of the application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integratively connected; either directly or indirectly through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[Example 1]

FIG. 1 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a first embodiment of the present invention.

As shown in Figure 1, the nuclear island structure composite shock-absorbing damping system of the present invention comprises: box body 10, several shock-isolation bearings 30 and some shock-absorbing devices 40, box body 10 has box body bottom plate 11 and box body side The wall 12 and the nuclear island structure 20 are placed in the box body 10. The nuclear island structure 20 has a nuclear island structure bottom plate 21 and a nuclear island structure side wall 22; the shock isolation support 30 is placed between the box body bottom plate 11 and the nuclear island structure bottom plate 21 Between; the damping device 40 is placed between the side wall 12 of the box body and the side wall 22 of the nuclear island structure.

The bottom plate 11 of the box body and the side wall 12 of the box body are made of materials with high rigidity, so that the bottom plate 11 of the box body and the side wall 12 of the box body form a box body 10 with high rigidity. The independent space of the nuclear island structure 20 is buried, and the bottom plate 11 and the side wall 12 of the box have the function of shielding radiation, so that the box 10 can be used as an additional radiation protection structure, which can reduce the risk of nuclear fuel leakage. The cross-sectional dimensions of the box bottom plate 11 and the box side wall 12 are determined according to the stress and radiation shielding requirements. The size of the clear space between the box side wall 12 and the nuclear island structure side wall 22 is determined according to the installation requirements of the shock absorbing device 40 and the displacement requirements of the nuclear island structure 20 on the shock isolation system.

The seismic isolation support 30 is the main component of the seismic isolation system, and the seismic isolation support 30 is connected with the bottom plate 11 of the box body and the bottom plate 21 of the nuclear island structure to form a seismic isolation system. The number of seismic isolation supports 30 is mainly calculated according to the bearing capacity and the earthquake force. The plane layout of the seismic isolation support 30 needs to comprehensively consider the stiffness and mass distribution characteristics of the nuclear island structure 20 to ensure that the center of mass and rigid center of the overall seismic isolation system coincide with the center of mass and rigid center of the nuclear island structure 20. To reduce the torsional movement of the nuclear island structure 20 under earthquake action. The shock-isolation bearing 30 can be selected from natural rubber bearings, lead rubber bearings, and high damping rubber bearings.

Several shock absorbing devices 40 arranged between the box side wall 12 and the nuclear island structure side wall 22 form a shock absorbing system. The shock absorbing device 40 may adopt a hydraulic viscous damper or a tension-compression two-way damping and shock absorbing device. When an earthquake occurs, the shock absorbing device 40 exerts a reaction force on the nuclear island structure 20 on the seismic isolation system to suppress the swing effect of the seismic isolation system and control the vertical acceleration response of the nuclear island structure 20 .

The shock absorber 40 is a vertical shock absorber 401 and/or a horizontal shock absorber 402, where the vertical shock absorber 401 refers to a vertically arranged shock absorber 40, and the horizontal shock absorber 402 refers to a horizontally arranged shock absorber 402. Shock absorbing device 40. In the first embodiment shown in FIG. 1 , an example is given in which the shock absorbing device 40 is a vertical shock absorbing device 401 .

As shown in Figure 1, the upper part of the nuclear island structure side wall 22 is provided with an upper outrigger cantilever beam 201, and the middle part of the box side wall 12 is provided with a middle part outrigger cantilever beam 122, and the vertical shock absorbing device 401 is connected with the upper part respectively. The outrigger cantilever beam 201 is connected to the middle outrigger cantilever beam 122 . A vertical damping device 401 is also arranged between the middle part and the bottom of the side wall 12 of the box body and the side wall 22 of the nuclear island structure. A vertical damping device 401 is connected between the cantilever beam 122 and the bottom outrigger cantilever beam 202 . It should be noted that the bottom outrigger cantilever beam 202 can also be arranged at the bottom of the side wall 22 of the nuclear island structure.

The box body side wall 12 adopts a support arm type retaining wall structure or an anchor pull type retaining wall structure. As shown in FIG. 1 , the arm-type retaining wall structure here means that the box side wall arm 121 is provided on the box side wall 12 to increase the strength of the box side wall 12 .

[Example 2]

The nuclear-island structure composite shock-isolation and shock-absorbing system of the second embodiment of the present invention is the same as the main structure of the first embodiment, and a shock-isolation support 30 is provided between the box bottom 11 and the nuclear-island structure bottom 21 . The difference is that the damping device 40 is a horizontal damping device 402 .

Fig. 2 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a second embodiment of the present invention.

As shown in Figure 2, the horizontal damping device 402 is respectively connected to the side wall 12 of the box body and the side wall 22 of the nuclear island structure. The number of horizontal damping devices 402 arranged on each floor is determined according to the deformation characteristics of the nuclear island structure and the force calculation, and more horizontal damping devices 402 are arranged in the parts with large deformation. For example, since the top of the nuclear island structure 20 sways and deforms more than the bottom under earthquake action, the number of layers arranged on the top should be more than that on the bottom.

[Embodiment 3]

The nuclear-island structure composite shock-isolation and shock-absorbing system of the third embodiment of the present invention is the same as the main structure of the first and second embodiments, and a shock-isolation support 30 is provided between the box bottom 11 and the nuclear-island structure bottom 21 . The difference is that the damping device 40 is an example of a mixed arrangement of the vertical damping device 401 and the horizontal damping device 402 . It should be noted that although the situation shown in FIG. 3 is provided for the mixed arrangement of the vertical shock absorber 401 and the horizontal shock absorber 402, the shock absorber 40 is only a preferred embodiment. The vertical shock absorber The mixed arrangement of 401 and horizontal damping device 402 can be arranged in different forms according to needs.

Fig. 3 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a third embodiment of the present invention. As shown in Figure 3, the upper part of the nuclear island structure side wall 22 is provided with an upper outrigger cantilever beam 201, and the middle part of the box side wall 12 is provided with a middle outrigger cantilever beam 122, and the vertical shock absorbing device 401 is connected with the upper part respectively. The outrigger cantilever beam 201 is connected to the middle outrigger cantilever beam 122 . In the embodiment shown in FIG. 3 , a horizontal damping device 402 is provided between the box side wall 12 and the middle and bottom of the nuclear island structure side wall 22 .

The vertical shock absorbing device 401 is the same as the horizontal shock absorbing device 402 , and is arranged in layers. The total number of layers and the number of 40 shock absorbing devices per layer are determined according to the seismic force and the bearing capacity of the shock absorbing device 40 . Since the top of the nuclear island structure 20 swings and deforms more than the bottom under earthquake action, a larger deformation stroke is more conducive to the damping effect of the shock absorbing device 40, so the number of layers on the top should be more than that on the bottom.

The upper outrigger cantilever beam 201, the middle outrigger cantilever beam 122 and the bottom outrigger cantilever beam 202 play an important role in force transmission, and stiff concrete members can be selected.

[Example 4]

The nuclear island structure composite shock-isolation and shock-absorbing system of the fourth embodiment of the present invention is the same as the main structure of the first embodiment, the second embodiment and the third embodiment, and the shock isolation is set between the box bottom plate 11 and the nuclear island structure bottom plate 21 Support 30. The difference is that an anchor pull type retaining wall structure is also provided outside the box body 10 .

Fig. 4 is a schematic diagram of a nuclear-island structure composite shock-isolation and shock-absorbing system according to a fourth embodiment of the present invention

As shown in FIG. 4 , the anchor pull type retaining wall structure means that the side wall 12 of the box is provided with an anchor cable 123 , and the anchor cable 123 can increase the bearing capacity of the side wall 12 of the box. One end of the anchor cable 123 is connected to the side wall 12 of the box body, and the other end can be connected to the foundation or a fixture on the foundation. The height of the box side wall 12 can be determined according to the buried depth of the nuclear island structure 20 .

The bottom plate of the box body 11 adopts a flat structure, a beam-slab structure or a pile-raft structure. When a beam-slab floor is used, the plane layout of the foundation beam must be determined according to the layout requirements of the shock-isolation support 30 .

[Embodiment 5]

The nuclear island structure composite seismic isolation and shock absorption system of the fifth embodiment of the present invention is the same as the main structure of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment. The vibration-isolation bearing 30 is arranged in between. The difference is that foundation piles are also arranged at the bottom of the box body 10 .

As shown in Fig. 5, foundation piles 111 are provided at the bottom of the box bottom plate 11 to increase the strength of the box 10, improve the site adaptability of small reactor power plants, and allow power plant construction under complex geological conditions. The foundation piles 111 are prefabricated piles or cast-in-situ piles, and of course other pile types that have been fully verified by the project can also be used.

The composite seismic isolation and shock absorption system of the nuclear island structure of the present invention is based on the layout characteristics of the deep buried structure of the nuclear island structure 30. The seismic isolation support 30 and the shock absorbing device 40 are used in combination to complement each other and greatly improve the earthquake resistance of the nuclear island structure 30. The safety under the action and the ability to resist earthquakes; the layout of the seismic isolation system comprehensively considers the mass and stiffness distribution characteristics of the nuclear island structure 30, and reduces the torsional movement of the nuclear island structure 30 under the action of earthquakes through the coincidence of the center of mass and the center of rigidity; The spatial layout scheme of the system satisfies the force and deformation characteristics of the nuclear island structure 30, minimizes the swing effect and vertical response; greatly improves the site adaptability of small reactor power plants, and can carry out power plant construction under complex geological conditions; realizes small reactors The standardized design of the power station, for different plant sites, only needs to re-evaluate the isolation and shock absorption system, which greatly shortens the design cycle of the power station and reduces the design cost.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A nuclear island structure composite shock-isolation and shock-absorbing system, characterized in that it includes:

A box body, which has a box body bottom plate and a box body side wall, the nuclear island structure is placed in the box body, and the nuclear island structure has a nuclear island structure bottom plate and a nuclear island structure side wall;

a plurality of shock-isolation supports placed between the bottom plate of the box body and the bottom plate of the nuclear island structure; and

Several damping devices are placed between the side walls of the box body and the side walls of the nuclear island structure.
The nuclear-island structure composite shock-isolation and shock-absorbing system according to claim 1, wherein the shock-absorbing device is a vertical shock-absorbing device and/or a horizontal shock-absorbing device.
The composite seismic isolation and shock absorption system of nuclear island structure according to claim 2, wherein the horizontal shock absorbing device is respectively connected to the side wall of the box body and the side wall of the nuclear island structure.
The composite seismic isolation and damping system of nuclear island structure according to claim 2, characterized in that, the upper part of the side wall of the nuclear island structure is provided with an upper outrigger cantilever beam, and the middle part of the side wall of the box is provided with a middle part An outrigger cantilever beam, the vertical damping device is respectively connected with the upper outrigger cantilever beam and the middle outrigger cantilever beam.
The composite seismic isolation and shock absorption system of nuclear island structure according to claim 4, characterized in that, the bottom of the side wall of the nuclear island structure or the bottom plate of the nuclear island structure is provided with a bottom outrigger cantilever beam, and the middle part The vertical damping device is connected between the outrigger cantilever beam and the bottom outrigger cantilever beam.
The nuclear-island structure composite shock-isolation and shock-absorbing system according to claim 2, wherein the shock-absorbing device adopts a hydraulic viscous damper or a tension-compression two-way damping and shock-absorbing device.
The composite seismic isolation and shock absorption system of nuclear island structure according to claim 1, characterized in that, the side wall of the box is a support arm type retaining wall structure or an anchor pull type retaining wall structure.
The nuclear-island structure composite seismic isolation and shock absorption system according to claim 1, wherein the bottom plate of the box body is a flat structure, a beam-slab structure or a pile-raft structure.
The composite seismic isolation and shock absorption system of nuclear island structure according to claim 1, characterized in that foundation piles are arranged at the bottom of the bottom plate of the box body.
The composite seismic isolation and shock absorption system of nuclear island structure according to claim 9, wherein the foundation piles are prefabricated piles or cast-in-situ piles.