CN112710543B - A kind of strength test device for local components of containment - Google Patents

Abstract

The invention relates to a device for testing the strength of local components of a containment shell, comprising a rigid reaction force base, a radial actuator group, a hydraulic oil loading mechanism and a pair of annular sliding support mechanisms. The rigid reaction force base is provided with an actuation mechanism. The radial actuator group is arranged in the actuator group placement groove and communicated with the hydraulic oil loading mechanism, and a pair of annular sliding support mechanisms are respectively arranged in the two opposite actuator group placement grooves. on the side wall. Compared with the prior art, the present invention has the characteristics of simple device, convenient disassembly, easy assembly, low cost, suitable for different size containment tests, etc., can accurately reflect the load condition and boundary conditions of the containment under an accident, and can The purpose of the research on the strength performance of the local components of the containment is to meet the requirements of economical and sustainable development.

Description

A device for testing the strength of local components of containment

technical field

The invention belongs to the technical field of containment testing, and relates to a strength testing device for local components of a containment.

Background technique

The containment vessel is the last safety protection barrier of a nuclear power plant to prevent the spread of radioactive substances to the external environment. It is the outermost building of the reactor. It contains the complex internal reactor cooling system, nuclear steam supply system and important safety systems. The environment is isolated from internal systems and prevents the effect of radioactive material spreading to the outside world in the event of rare water loss and serious accidents. When a reactor accident occurs, a large amount of radioactive material and high-temperature and high-pressure soda-water mixture can be contained and isolated by the containment to prevent radioactive contamination of the surrounding environment of the nuclear power plant. Due to the importance of containment, it has always been the focus of domestic and foreign engineering research.

At present, the full-scale test is mainly used in China to explore the strength performance of the containment by simulating the accident in the actual containment. Although this method can simulate the actual situation more accurately, the test cost is large, and it may also affect the containment. The structure causes damage and does not meet the requirements of economical sustainable development.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a strength test device for local components of the containment, which can accurately simulate the boundary conditions and stress conditions of the containment when a water loss accident occurs, so as to explore the strength performance of the local components of the containment.

The object of the present invention can be realized through the following technical solutions:

A device for testing the strength of local components of a containment shell, the device includes a rigid reaction force base, a radial actuator group, a hydraulic oil loading mechanism and a pair of annular sliding support mechanisms, wherein the rigid reaction force base is provided with The actuator group placement groove, the radial actuator group is arranged in the actuator group placement groove, and is communicated with the hydraulic oil loading mechanism, and the pair of annular sliding support mechanisms are respectively arranged in the actuator group. The device group is placed on the two opposite side walls of the slot.

Further, the rigid reaction force base includes a base body and longitudinal bars, stirrups and prestressed steel bars respectively arranged inside the base body, the prestressed steel bars are arranged at the lower part of the base body, and the The longitudinal bars and stirrups are laid out in full section along the vertical section of the base body. The base body is a concrete structure. The rigid reaction force base is prestressed by post-tensioning method, and longitudinal bars and stirrups are arranged.

Further, the radial actuator group includes a plurality of radial actuators arranged in the actuator group placement groove, and the radial actuators are arranged perpendicular to the bottom surface of the actuator group placement groove. . The radial actuators are adjusted in angle and quantity according to the size of the containment specimen.

Further, the top and bottom of the radial actuator group are provided with backing plates, the backing plate at the bottom of the radial actuator group is embedded in the rigid reaction force base, and the radial The backing plate at the top of the actuator group is fixedly connected to the bottom of the containment specimen. The contact positions of the radial actuator, the containment specimen and the rigid reaction force base are all embedded with thick steel plates as force transmission pads to avoid stress concentration and achieve uniform loading.

Further, the hydraulic oil loading mechanism includes a high-pressure oil pump, a synchronous distribution valve arranged on the high-pressure oil pump, and a plurality of hydraulic oil pipes arranged between the synchronous distribution valve and the radial actuator group. The radial actuator and the high-pressure oil pump are connected by a synchronous distribution valve and a hydraulic oil pipe, so as to realize the synchronous loading of each radial actuator.

Further, the annular sliding support mechanism includes a composite plate arranged on the side wall of the actuator group placement groove and a test piece steel sleeve slidably arranged in the composite plate. The ends of the parts are fixedly connected.

Further, the combination plate includes a bottom plate arranged on the side wall of the actuator group placement slot and a side plate arranged on the bottom plate and enclosing a rectangular cavity, and a side plate is provided between the outer side of the side plate and the bottom plate. There is a stiffening plate, and one end of the steel sleeve of the test piece is slidably arranged in a rectangular chamber. The bottom plate is fixed on the base body through the embedded connecting bolts on the side wall of the actuator group placement slot, and the position can be adjusted according to the size of the containment specimen.

Further, one end of the steel sleeve of the test piece is a steel sleeve shell part, and the other end is a sliding guide part, the steel sleeve shell part is fixedly sleeved on one end of the containment test piece, and the sliding guide part The part is slidably arranged in a rectangular chamber.

Further, a plurality of rivets distributed in an array are arranged inside the steel sleeve housing part, and the rivets are embedded in the containment test piece. Rivets are welded inside the steel jacket housing portion. The steel sleeve of the test piece is integrally poured with the containment test piece, and the prestress is applied to the steel sleeve of the test piece.

Further, the sliding guide portion is provided with a plurality of guide holes, and the rectangular cavity is provided with pins matched with the guide holes. The pin is in the form of a cuboid.

Preferably, the sliding guide portion is formed by splicing a plurality of T-shaped pieces in sequence, a guide hole is formed between two adjacent T-shaped pieces, the pin bolt passes through the corresponding guide hole, and the pin Both ends of the bolt are fixedly connected with the side plate. The surfaces of the pins and the annular sliding support mechanism are polished smoothly, allowing the containment specimen to slide freely during loading.

The invention adopts the model test method, uses the hydraulic oil loading mechanism and the radial actuator group to simulate the increase of the internal pressure of the containment when an accident occurs, and adopts appropriate boundary conditions to make the stress of the containment increase uniformly during loading, which not only can The strength performance of the containment can be obtained more accurately, and various disadvantages of the full-scale test can also be overcome, and the requirements of economy and sustainable development can be achieved.

Among them, the radial actuator is used to simulate the increase of the internal pressure of the containment under the water loss accident, and the high-pressure oil pump and the radial actuator group are connected by a synchronous distribution valve to realize synchronous loading. The annular sliding support mechanism is used to simulate the boundary conditions when the pressure inside the containment increases. The test device is detachable, and the test device is adjusted according to the size of different specimens before the test.

Numerical simulation is carried out by ABAQUS. During the loading process, the stress and strain of the containment are basically uniformly distributed along the hoop and radial directions, which shows that the loading mode and boundary conditions of the test can simulate the actual situation more accurately; The sliding support mechanism, the sliding guide part, and the pins and other components have a large reserve of rigidity and strength, which can ensure the smooth progress of the test and will not cause large deformation or damage during the loading process. Therefore, the present invention can achieve the purpose of performing strength performance test on the partial components of the containment.

Compared with the prior art, the present invention has the following characteristics:

1) The present invention provides a device for testing the strength of local components of a containment, which has the characteristics of simple device, convenient disassembly, easy assembly, low cost, suitable for testing of different sizes of containment, etc., and can accurately reflect the load condition of the containment under an accident. and boundary conditions, can achieve the purpose of research on the strength performance of local components of the containment, and meet the requirements of economic and sustainable development.

2) The present invention provides a uniform inner surface pressure through the radial actuator group and the backing plate to simulate the increase of the internal pressure of the containment in the event of an accident; the annular sliding support mechanism provides a circumferential constraint for the test piece to relax The radial constraints can accurately simulate the actual boundary conditions of the containment.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the structural representation of rigid reaction force base in the present invention;

3 is a schematic structural diagram of a radial actuator group and a hydraulic oil loading mechanism in the present invention;

4 is a schematic structural diagram of the annular sliding support mechanism in the present invention;

Fig. 5 is the structural representation of the containment test piece in the present invention;

Fig. 6 is A-A sectional view in Fig. 5;

Fig. 7 is the stress cloud diagram of the test device after loading in the embodiment;

Fig. 8 is the stress cloud diagram of the containment specimen after prestressing is applied in the embodiment;

Fig. 9 is the stress cloud diagram of the containment specimen after loading in the embodiment;

Fig. 10 is the stress cloud diagram of the steel bar of the containment specimen in the embodiment;

11 is a stress cloud diagram of the annular sliding support mechanism in the embodiment;

Fig. 12 is the stress cloud diagram of the sliding guide part in the embodiment;

Fig. 13 is the stress cloud diagram of the rigid reaction force base in the embodiment;

Fig. 14 is the stress cloud diagram of the rigid reaction force base reinforcing bar in the embodiment;

Description of the marks in the figure:

1—actuator group placement slot, 2—base body, 3—longitudinal reinforcement, 4—stirrup, 5—prestressed reinforcement, 6—radial actuator, 7—backing plate, 8—containment specimen , 9—high pressure oil pump, 10—synchronized distribution valve, 11—hydraulic oil pipe, 12—test piece steel sleeve, 13—bottom plate, 14—side plate, 15—steel sleeve shell, 16—slide guide, 17—rivet , 18 - guide hole, 19 - pin, 20 - stiffening plate.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation manner and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

Example:

As shown in Figure 1, a device for testing the strength of local components of a containment includes a rigid reaction force base, a radial actuator group, a hydraulic oil loading mechanism and a pair of annular sliding support mechanisms. The rigid reaction force base is provided with There is an actuator group placement slot 1, the radial actuator group is arranged in the actuator group placement slot 1, and is communicated with the hydraulic oil loading mechanism, and a pair of annular sliding support mechanisms are respectively arranged in the actuator group placement slot 1. On the two opposite side walls of groove 1.

As shown in FIG. 2 , the rigid reaction force base includes a base body 2 and longitudinal bars 3 , stirrups 4 , and prestressed steel bars 5 respectively arranged inside the base body 2 . The prestressed steel bars 5 are arranged on the base body 2 . In the lower part, the longitudinal bars 3 and the stirrups 4 are arranged in full cross-section along the vertical cross-section of the base body 2 .

As shown in FIG. 3 , the radial actuator group includes a plurality of radial actuators 6 arranged in the actuator group placement groove 1 , and the radial actuators 6 are perpendicular to the bottom surface of the actuator group placement groove 1 set up. The top and bottom of the radial actuator group are provided with backing plates 7, the backing plate 7 at the bottom of the radial actuator group is embedded in the rigid reaction force base, and the backing plate at the top of the radial actuator group and the safety shell The bottom of the test piece 8 is fixedly connected.

The hydraulic oil loading mechanism includes a high pressure oil pump 9 , a synchronous distribution valve 10 arranged on the high pressure oil pump 9 , and a plurality of hydraulic oil pipes 11 arranged between the synchronous distribution valve 10 and the radial actuator group.

As shown in Figure 4, Figure 5, Figure 6, the annular sliding support mechanism includes a composite plate arranged on the side wall of the actuator group placement groove 1 and a test piece steel sleeve 12 slidably arranged in the composite plate. The sleeve 12 is fixedly connected to the end of the containment test piece 8 . The combination plate includes a bottom plate 13 arranged on the side wall of the actuator group placement slot 1 and a side plate 14 arranged on the bottom plate 13 and enclosing a rectangular chamber. A stiffening plate is provided between the outer side of the side plate 14 and the bottom plate 13 20. One end of the steel sleeve 12 of the test piece is slidably arranged in the rectangular chamber. One end of the test piece steel sleeve 12 is the steel sleeve shell part 15, and the other end is the sliding guide part 16. The steel sleeve shell part 15 is fixedly sleeved on one end of the containment test piece 8, and the sliding guide part 16 is slidably arranged in the rectangular cavity. in the room. A plurality of rivets 17 distributed in an array are arranged inside the steel jacket housing portion 15 , and the rivets 17 are embedded in the containment test piece 8 . The sliding guide portion 16 is provided with a plurality of guide holes 18 , and the rectangular cavity is provided with pins 19 matching with the guide holes 18 .

The installation process of this test device is as follows:

When pouring a rigid reaction force base, pre-embed bolts and backing plates 7 during pouring, and apply prestress by post-tensioning method. The annular sliding support mechanism is connected to the bolt; the containment specimen 8 is poured together with the specimen steel sleeve 12, the backing plate 7 is embedded on the containment specimen 8, and the containment prestress can be applied to the specimen steel sleeve 12 After the test piece is made, it is placed on the rigid reaction force base, and it is fixed with the annular sliding support mechanism through the pin 19; the radial actuator 6 is installed. After the assembly is completed, the radial actuator 6 is activated, and the strength test of the partial components of the containment can be carried out.

Numerical simulation is performed by ABAQUS. After the components are created and assembled, prestress is applied to the containment specimen 8 by the cooling method, a static general analysis step is created to analyze the device, and the concentrated load is applied to the backing plate 7. It can be seen from Figure 7, Figure 8, Figure 9 and Figure 10 that the internal force of the containment specimen 8 and the internal prestressed steel strand before and after loading is evenly distributed, which is more accurate with the actual situation; The sliding support mechanism and the pin are still in an elastic state, and their rigidity is relatively large; it can be seen from Figure 12 that the connection part between the sliding guide part 16 and the prestressed steel strand enters plasticity due to stress concentration, but the stress in other parts is small, which does not affect the connection parts. It can be seen from Figure 13 and Figure 14 that the rigid reaction force base and its internal steel bars are still in an elastic state after loading, which can ensure a large stiffness and strength reserve during the loading process, and can ensure the smooth progress of the test.

The foregoing description of the embodiments is provided to facilitate understanding and use of the invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made, and the generic principles described herein can be applied to other embodiments without inventive step. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should all fall within the protection scope of the present invention.

Claims (5)

1. A containment local member strength test device is characterized by comprising a rigid counter-force base, a radial actuator group, a hydraulic oil loading mechanism and a pair of circumferential sliding support mechanisms, wherein the rigid counter-force base is provided with an actuator group placing groove (1), the radial actuator group is arranged in the actuator group placing groove (1) and communicated with the hydraulic oil loading mechanism, and the pair of circumferential sliding support mechanisms are respectively arranged on two opposite side walls of the actuator group placing groove (1);

the circumferential sliding support mechanism comprises a composition plate arranged on the side wall of the actuator group placement groove (1) and a test piece steel sleeve (12) arranged in the composition plate in a sliding manner, and the test piece steel sleeve (12) is fixedly connected with the end part of the containment test piece (8);

the combined plate comprises a bottom plate (13) arranged on the side wall of the actuator group placing groove (1) and side plates (14) arranged on the bottom plate (13) and enclosing a rectangular cavity, a stiffening plate (20) is arranged between the outer side surfaces of the side plates (14) and the bottom plate (13), and one end of the test piece steel sleeve (12) is arranged in the rectangular cavity in a sliding mode;

one end of the test piece steel sleeve (12) is a steel sleeve shell part (15), the other end of the test piece steel sleeve is a sliding guide part (16), the steel sleeve shell part (15) is fixedly sleeved at one end of the containment test piece (8), and the sliding guide part (16) is arranged in the rectangular cavity in a sliding mode;

a plurality of rivets (17) distributed in an array manner are arranged inside the steel sleeve shell part (15), and the rivets (17) are embedded in the containment test piece (8);

a plurality of guide holes (18) are formed in the sliding guide part (16), and a pin bolt (19) matched with the guide holes (18) is arranged in the rectangular cavity;

the radial actuator group is used for providing uniformly distributed inner surface pressure and simulating the increase of the internal pressure of the containment vessel when an accident occurs; the annular sliding support mechanism is used for providing annular restraint for the containment test piece (8) and relaxing radial restraint so as to accurately simulate the actual boundary conditions of the containment.

2. The containment local member strength test device according to claim 1, wherein the rigid reaction base comprises a base body (2), and a longitudinal bar (3), a hoop bar (4) and a prestressed bar (5) which are respectively arranged inside the base body (2), the prestressed bar (5) is arranged at the lower part of the base body (2), and the longitudinal bar (3) and the hoop bar (4) are arranged in a full section along a vertical section of the base body (2).

3. The containment local member strength test device according to claim 1, wherein the radial actuator group comprises a plurality of radial actuators (6) arranged in the actuator group placement groove (1), and the radial actuators (6) are arranged perpendicular to the bottom surface of the actuator group placement groove (1).

4. The containment local member strength test device according to claim 1, wherein the top and the bottom of the radial actuator group are provided with backing plates (7), the backing plate (7) at the bottom of the radial actuator group is embedded in a rigid reaction base, and the backing plate at the top of the radial actuator group is fixedly connected with the bottom of a containment test piece (8).

5. The containment local member strength test device according to claim 1, wherein the hydraulic oil loading mechanism comprises a high-pressure oil pump (9), a synchronous distribution valve (10) arranged on the high-pressure oil pump (9), and a plurality of hydraulic oil pipes (11) arranged between the synchronous distribution valve (10) and the radial actuator group.

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