Reactor pit uniform distribution loading test device and method

Abstract

The invention discloses a reactor pit uniform distribution loading test device and method.The reactor pit uniform distribution loading test device comprises an oil tank (1), a hydraulic pump (2), a plurality of force application parts (3) and a uniform distribution loading plate (4), hydraulic oil (11) is arranged in the oil tank (1), the oil tank (1) is in fluid communication with the hydraulic pump (2) through a connecting pipeline (5), the force application parts (3) are arranged outside the hydraulic pump (2) in the radial direction of the hydraulic pump (2), the force application parts (3) are detachably connected to the hydraulic pump (2), and the uniform distribution loading plate (4) is arranged on the hydraulic pump (2). The uniformly distributed loading plate (4) is arranged along the inner side surface of the pile pit (8) and is detachably connected to the force application part (3); according to the device design provided by the invention, the technical problems that an existing loading device is difficult to adapt to a cylindrical reactor pit structure, the loading mode is locally concentrated, annular uniform loading cannot be realized and the like are effectively solved, and a stable and uniform loading effect can be provided under a simulated explosion load or high-pressure working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear safety engineering, and particularly relates to a reactor pit uniform loading test device and method. BACKGROUND

[0002] In the case of a severe accident in a nuclear power plant and the heat cannot be effectively discharged, the reactor core may be molten, and direct contact between high-temperature reactor core molten material and water will cause a steam explosion, which may cause damage or even collapse of the adjacent structures and equipment. In order to eliminate or alleviate the damage caused by the steam explosion to the structure, the response behavior of the internal structure of the reactor cavity directly subjected to the steam explosion needs to be studied. Due to the need to accommodate, support multiple large and heavy equipment including the reactor pressure vessel and the steam generator, and also to consider the function of radiation shielding, the internal structure of the reactor pit is not a traditional typical beam, plate, column, wall structure, but a cylindrical structure consisting of a thick annular wall, a thick bottom plate and a vertical ring wall, which is a reactor pit structure.

[0003] At present, the research methods for the response of structures under explosion load mainly include numerical simulation method and experimental method, but the above methods have the disadvantages that the calculation results cannot be verified and confirmed, it is high in cost and extremely difficult to make a real steam explosion act on a full-scale structure; the methods for analyzing the dynamic response of cylindrical structures under explosion load are mainly numerical simulation method and experimental method. The numerical simulation method is to simulate the dynamic behavior of the structure by computer software to calculate its response characteristics under explosion load. These methods are usually based on finite element analysis (FEA) and computational fluid dynamics (CFD) techniques. Compared with experimental methods, numerical simulation has higher flexibility and repeatability. Researchers can quickly evaluate the performance of structures under different conditions by adjusting model parameters. In addition, numerical simulation can also analyze extreme conditions that are difficult to reproduce in experiments, thereby providing important reference data for design and safety evaluation.

[0004] However, the current experimental method still has the following shortcomings: (1) The accuracy of numerical simulation depends on the reasonableness of the model and assumptions used, so in practical applications, experimental data often need to be combined for correction and verification to ensure the reliability of the simulation results.

[0005] (2) Complex simulation requires a large amount of computing resources and time, especially when performing high-precision analysis, which limits the scale and depth of the research.

[0006] (3) Explosion tests are only suitable for small equivalent explosions and cannot simulate the real dynamic response of full-scale structures, so there are certain limitations in the application of reactor pit structures.

[0007] (4) Explosion tests involve the release of high energy, which poses significant safety risks. Strict control of the experimental environment and the safety of operators is required, which increases the difficulty of implementation.

[0008] (5) Due to the need for special test sites, the cost of explosion test methods is usually high.

[0009] Patent document CN120084507A discloses an impact pressure loading device and measurement method, including a first pressure bearing surface, a second pressure bearing surface, an injection pipe, and a pressure tapping pipe. The first and second pressure bearing surfaces are parallel to each other and spaced apart, forming two opposite end faces of the impact pressure loading device. The first and second pressure bearing surfaces form a cavity. The injection pipe and the pressure tapping pipe are both connected to the cavity and extend to the outside of the impact pressure loading device. The impact pressure loading device is installed in a ring around the periphery of the embedded structure of the specimen according to the embedded structure of the specimen. The force-bearing module is fitted and installed with the impact pressure loading device. However, this method does not solve the problems of insufficient accuracy of numerical simulation, high consumption of computational resources, limitations of explosion testing, and high safety hazards.

[0010] Patent document CN117657933A discloses a lifting device and its usage method for a fixed shielding device on the top of a sodium-cooled fast reactor. The device includes two main supporting beams, two crossbeams, two end beams, four columns, multiple hydraulic systems, and multiple slings. The two crossbeams are connected between the opposite sides of the two main supporting beams. The end beams are located on the bottom surface of the ends of the main supporting beams. The columns are located on the side of the end beams away from the crossbeams, with one column at each end of each end beam. Multiple hydraulic systems are evenly distributed around the area enclosed by the two crossbeams and the two main supporting beams. Multiple slings are connected to the multiple hydraulic systems via wire ropes, and the slings are bolted to the inner ring of the fixed shielding device on the top of the reactor. The hydraulic system is configured to lift the wire ropes by applying pressure, thus driving the slings and the inner ring upwards. However, this design does not address the problems of insufficient accuracy in numerical simulation, high computational resource consumption, limitations in explosion testing, and high safety hazards.

[0011] In summary, neither of the two existing patents mentioned above has solved the problems of insufficient accuracy in numerical simulation, high consumption of computational resources, limitations of explosion testing, and high safety risks. Summary of the Invention

[0012] Based on the above-mentioned technical problems, this invention proposes a uniformly distributed loading test device and method for crater, which solves the problems of insufficient accuracy of numerical simulation, large consumption of computing resources, limitations of explosion test and high safety hazards.

[0013] To achieve the above objectives, the present invention proposes a uniformly distributed loading test device for pile pits.

[0014] The application discloses a kind of test devices of uniform loading of heap pit, including oil tank, hydraulic pump, multiple force parts and uniform loading plate, hydraulic oil is provided in the oil tank, the oil tank is in fluid communication with the hydraulic pump by connecting pipeline, the force part is arranged in the outside of the hydraulic pump along the radial direction of the hydraulic pump, the force part is detachably connected to the hydraulic pump, the uniform loading plate is arranged along the inside surface of heap pit, and the uniform loading plate is detachably connected to the force part.

[0015] Further, it further comprises that 1 force part is arranged at the end of the hydraulic pump along the axial direction of the hydraulic pump.

[0016] Further, the hydraulic pump is a cylinder, and multiple force parts are uniformly distributed on one circular section of the hydraulic pump;Multiple force parts are uniformly distributed along a generatrix of the hydraulic pump.

[0017] Further, 3-8 force parts are arranged on one circular section of the hydraulic pump;2-10 force parts are arranged on a generatrix of the hydraulic pump.

[0018] Further, the hydraulic pump is used to pressurize the hydraulic oil, so that the hydraulic oil transmits force to the contacted force part to drive the part of the force part to move along the radial direction of the hydraulic pump.

[0019] Further, the force part comprises a hydraulic cylinder, which is in fluid communication with the hydraulic pump.

[0020] Further, the hydraulic cylinder comprises a through slot, which penetrates through both ends of the hydraulic cylinder along the radial direction of the hydraulic cylinder.

[0021] Further, the force part comprises a piston rod, which is drivably arranged in the through slot, and the piston rod is driven to move along the axial direction of the through slot by the hydraulic pump pressing the internal hydraulic oil.

[0022] Further, it further comprises vertical support columns and horizontal support columns, and the horizontal support columns are connected to two vertical support columns.

[0023] Further, the oil tank is fixed on the horizontal support column.

[0024] Further, the force part is connected to the geometric center of the uniform loading plate.

[0025] To achieve the above purpose, the application further provides another test method of uniform loading of heap pit, using the test device of uniform loading of heap pit, comprising: The uniform load plate is arranged on the inner side surface of the pit, the force applying part is installed on the hydraulic pump, the hydraulic pump is placed inside the pit, and the force applying part is fixed on the corresponding position of the uniform load plate. Sensors are arranged inside and outside the pit, the hydraulic pump is started, and data is collected through the sensors.

[0026] Further, it also includes: The oil tank is fixed on the transverse support column.

[0027] Further, it also includes: The process of the hydraulic pump applying force to the pit is recorded by a high-speed camera system.

[0028] Further, the sensors include: Array flexible thin film pressure sensors and / or displacement sensors.

[0029] Further, sensors are arranged inside and outside the pit, including: The array flexible thin film pressure sensor is arranged between the uniform load plate and the inner side surface of the pit for measuring uniform pressure. The displacement sensor is arranged outside the pit for measuring the structural displacement of the pit.

[0030] Based on the above technical solution, the present application has at least the following advantages: 1. The present application proposes a pit uniform load testing device and method, which is constructed by the organic cooperation of an oil tank, a hydraulic pump, multiple force applying parts and a uniform load plate, forming a hydraulic loading system suitable for pit structure inner wall loading test, which is detachable, expandable and has strong adaptability; wherein the oil tank is provided with hydraulic oil, the hydraulic pump is in fluid communication with the oil tank through a pipeline, forming a complete pressure supply circuit; multiple force applying parts are arranged radially along the hydraulic pump, which can apply force to the pit inner wall in multiple directions synchronously, and are detachably connected with the hydraulic pump, facilitating system installation, disassembly and maintenance; the uniform load plate is arranged along the inner side of the pit and connected with the multiple force applying parts, which can uniformly transmit the force from the force applying parts to the pit structure surface; the device designed by the present application effectively solves the technical problems of existing loading devices, such as difficulty in adapting to cylindrical pit structure, local concentration of loading mode, and inability to realize circumferential uniform loading, and can provide stable and uniform loading effect under simulated explosion load or high pressure working condition.

[0031] 2.The application provides a kind of pile pit uniform loading test device and method, by arranging multiple force applying parts on the axial end of hydraulic pump and its circular section and generatrix direction, forming a multi-directional, uniform loading system for pile pit structure, wherein, the force applying parts on the circular section are distributed in a ring around the hydraulic pump, which can achieve symmetrical loading at multiple angles of the inner wall of the pile pit, and the force applying parts in the generatrix direction make the force act uniformly along the vertical direction of the pile pit, which helps to simulate the diffusion trend of explosion load in space. By reasonably setting the number of force applying parts, not only the distribution density and uniformity of the loading are improved, but also the configuration can be flexibly adjusted according to different pile pit model sizes and experimental requirements, taking into account the structural complexity and control accuracy. The design improves the adaptability of the loading system to complex pile pit geometry, providing reliable support for real and uniform simulation of explosion load.

[0032] 3.The application provides a kind of pile pit uniform loading test device and method, by pressurizing hydraulic oil through a hydraulic pump, and using the power conversion mechanism of hydraulic cylinder and piston rod to realize the radial driving and controllable loading output of the force applying part. The hydraulic cylinder improves the stroke length and structural arrangement flexibility of the loading component through the through slot structure; the device of the application effectively realizes the continuous force transmission path from the hydraulic pump, hydraulic oil, hydraulic cylinder, piston rod to the loading plate, has good power closure, response controllability and loading consistency, compared with the existing local loading method, the application realizes stable output of larger and uniformly distributed radial force through structure integration and force transmission path design, which is especially suitable for the loading demand of pile pit structure with cylindrical shape, high stiffness and large size.

[0033] 4.The application provides a kind of pile pit uniform loading test device and method, by arranging array type flexible film pressure sensor and displacement sensor inside and outside the pile pit to realize real-time monitoring of stress and strain during loading; combined with the whole process recording of high-speed camera system during loading, multi-modal and high-precision data acquisition and loading control can be realized, which effectively overcomes the problems of high cost, poor precision and non-repeatability of existing explosion test methods; the test method in the application not only ensures the controllability and repeatability of the loading state, but also significantly improves the spatial resolution of the loading data and the experimental reliability, providing an advanced, efficient and systematic test method for dynamic response evaluation of pile pit structure. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings accompanying the specification of the application form part of the application and serve to provide further understanding of the application, the exemplary embodiments of the application and their description serve to explain the application and do not constitute an improper limitation of the application. In the drawings: Figure 1 A three-dimensional structure diagram of the pile pit uniform loading test device of one embodiment is shown; Figure 2A three-dimensional structural diagram of a part of a pile pit uniform load test device of an embodiment is shown. Figure 3 A three-dimensional structural diagram of a hydraulic pump of an embodiment is shown. Figure 4 A three-dimensional structural diagram of a force applying part of an embodiment is shown. Figure 5 A schematic diagram of a uniform load plate and a pile pit of an embodiment is shown. Figure 6 A schematic diagram of a uniform load plate and a pile pit contact smooth construction method of an embodiment is shown.

[0035] Wherein the above figures include the following reference signs: 1, mailbox; 2, hydraulic pump; 3, force applying part; 4, uniform load plate; 5, connecting pipeline; 6, vertical support column; 7, horizontal support column; 8, pile pit; 9, sensor; 11, hydraulic oil; 31, hydraulic cylinder; 32, piston rod; 33, bolt; 91, array type flexible film pressure sensor; 92, displacement sensor; 311, through slot. DETAILED DESCRIPTION

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] The present application will be described in further detail below in combination with specific embodiments, which cannot be understood as limiting the scope of the claimed present application. The term “comprising” indicates the presence of a feature when used, but does not exclude the presence or addition of one or more other features; the terms “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; in addition, the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the description, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] Embodiments

[0040] The present application provides a kind of pile pit uniform distribution loading test device and method, as shown in Figure 1 Including oil tank 1, hydraulic pump 2, a plurality of force applying parts 3 and uniform distribution loading plate 4, the oil tank 1 is equipped with hydraulic oil 11, the oil tank 1 is connected with the hydraulic pump 2 by connecting pipeline 5 Fluidly communicate, the force applying part 3 is along the radial direction of the hydraulic pump 2 It is located outside the hydraulic pump 2, the force applying part 3 is detachably connected to the hydraulic pump 2, the uniform distribution loading plate 4 is arranged along the inside surface of the pile pit 8, the uniform distribution loading plate 4 is detachably connected to the force applying part 3.

[0041] In the present application, "drivablely arranged" means that the relevant components are embedded or guidedly installed in the defined space, and not rely on its own gravity or free sliding to realize movement, but need to be driven by external force such as hydraulic or electric drive under the action of the direction, which is usually accompanied by friction resistance, hydraulic damping or structural matching resistance, to realize controlled, stable or loaded movement process.

[0042] In the present application, "fluidly communicate" means that different containers or devices are connected by pipeline, pipeline and the like, and the transmission and distribution of gas or liquid and the like can be realized; in this communication system, gas or liquid and the like can flow from one container to another container or from one device to another device under the action of pressure difference.

[0043] In the present application, "circular cross section" refers to a complete circular plane inside the cylindrical structure, which is parallel to the upper and lower bottom surface of the cylinder, and the circular surface is perpendicular to the cylinder axis.

[0044] In the present application, "generatrix" refers to any generating line in the rotary surface formed by the specified rotation axis rotation in the cylindrical structure or other rotary body structure, and the generating line is parallel to the axis of the cylindrical structure in the cylindrical structure.

[0045] In the present application, "detachably connected" includes common connection forms such as threaded connection, snap connection, buckle connection, latch connection, elastic deformation connection, hinge connection, etc., which can facilitate the assembly, disassembly, adjustment, etc. of two or more components.

[0046] Specifically, as shown in Figure 2 , the hydraulic pump 2 is a cylinder, arranged inside the heap pit 8 along the axial direction of the heap pit 8, and the force applying part 3 is arranged outside the hydraulic pump 2 along the radial direction of the hydraulic pump 2. One force applying part 3 is arranged at one end of the hydraulic pump 2 along the axial direction of the hydraulic pump 2 and is embedded with the uniform load distribution plate 4 arranged on the bottom surface of the heap pit 8. In other embodiments, the force applying part 3 can not be arranged at one end of the hydraulic pump 2, and the pressure loading test can be performed only by the force applying part 3 around the hydraulic pump 2.

[0047] Further, as shown in Figure 2 and Figure 3 , the uniform load distribution plates 4 are uniformly arranged inside the heap pit 8 along the generatrix and the circular cross section. The number of uniform load distribution plates 4 is the same as the number of force applying parts 3 on the hydraulic pump 2. The uniform load distribution plates 4 at the bottom of the heap pit 8 are complete circular structures and are adjacent to the circumferentially arranged uniform load distribution plates 4.

[0048] Preferably, as shown in Figure 2 and Figure 3 , four force applying parts 3 are uniformly arranged outside the hydraulic pump 2 along the generatrix of the hydraulic pump 2. Four force applying parts 3 are uniformly arranged on one circular cross section where each force applying part 3 on the generatrix is located. One force applying part 3 is arranged at one end of the hydraulic pump 2, i.e. a total of 17 force applying parts 3 are arranged on the hydraulic pump 2, and 17 uniform load distribution plates 4 are correspondingly arranged. In other embodiments, two, six, eight or ten force applying parts 3 can be arranged on the generatrix, and three, five or eight force applying parts 3 can be arranged on each circular cross section, i.e. a total of six, seven, twelve, thirteen, thirty, forty, eighty or eighty-one various combinations of force applying parts 3 and corresponding number of uniform load distribution plates 4 can be arranged outside the hydraulic pump 2.

[0049] Further, as shown in Figure 4 , the force applying part 3 includes a hydraulic cylinder 31 and a piston rod 32. The hydraulic cylinder 31 is connected with the hydraulic pump 2. The hydraulic cylinder 31 includes a through slot 311, and the piston rod 32 is arranged in the through slot 311. The hydraulic oil 11 can flow into the inside of the hydraulic cylinder 31 to drive the piston rod 32 to move by the force of the hydraulic pump 2. In this embodiment, the piston rod 32 is fixed to the uniform load distribution plate 4 by a bolt 33. The force applied by the hydraulic pump 2 to drive the piston rod 32 is always applied to the geometric center of the uniform load distribution plate 4 in the same direction. In other embodiments, a fitting groove can be arranged at the center of the uniform load distribution plate 4 to fit with the piston rod, so as to maintain the consistency of the applied force.

[0050] Further, as shown in the Figure 1 , 2 vertical support columns 6 and 1 horizontal support column 7 are arranged outside the pile pit, the horizontal support column 7 is fixed between the 2 vertical support columns 6 by screw fastening, and the oil tank 1 is fixed inside the horizontal support column 7 by screw.

[0051] To achieve the above object, the present application further provides a pile pit uniform loading test method, which uses the pile pit uniform loading test device and method according to the above description, and includes the following steps: The uniform loading plate 4 is arranged on the inner surface of the pile pit 8, the force applying part 3 is installed on the hydraulic pump 2, the hydraulic pump 2 is placed inside the pile pit 8, and the force applying part 3 is fixed on the corresponding position of the uniform loading plate 4; Sensors 9 are arranged inside and outside the pile pit 8, the hydraulic pump 2 is started, and data is collected by the sensors 9.

[0052] Further, for the uniform loading plate 4, two problems need to be overcome; first, the problem of uneven loading or insufficient strength and stiffness of the uniform loading plate 4; because the force transmission path is force applying part 3-uniform loading plate 4-pile pit 8. The 360° around the inner wall is divided into multiple uniform loading plates 4, and each uniform loading plate 4 can perfectly transmit and calculate the outward expansion force; second, the problem of relative sliding between the uniform loading plate 4 and the inner wall of the pile pit 8. With the expansion of the outward loading, the pile pit 8 will expand circumferentially, and the contact between the uniform loading plate 4 and the inner wall of the pile pit 8 is easy to produce a large friction force, which will produce an unnecessary constraint on the pile pit 8.

[0053] Specifically, for the block and stiffness evaluation of the uniform loading plate 4, the classical theory of elasticity is used to evaluate the internal force of the pile pit 8 under the test concerned working condition and the characteristic requirement of the uniform loading plate 4; the formula of the thick cylinder wall internal pressure and the axial tensile stress of the cylinder wall of the pile pit 8 is expressed by the theory of elasticity as follows: , Where a and b are the inner diameter and outer diameter of the pile pit 8, respectively, and the specific arrangement is shown in Figure 5 .

[0054] Further, according to the state of the pile pit 8 under test loading, the value of the axial tensile stress of the cylinder wall is considered. If it is only elastic and preliminary shaping, it can be taken as the tensile stress of the concrete used or 10 MPa; if it is to achieve larger cracking or overall damage of the pile pit 8, the value of the internal radial main reinforcement yield load needs to be considered, and the simplified model for calculating the stiffness of the uniform loading plate 4 is shown in Figure 6 , which can be calculated from the above formula: , wherein a and b are the inner diameter and the outer diameter of the cylinder test piece respectively, is the internal pressure of the thick cylinder wall, is the axial tensile stress of the cylinder wall of the pile pit 8.

[0055] Further, the Sa is calculated as the area of the loading plate, and the expression is as follows: , wherein is the concentrated force of the loading plate, is the internal pressure of the thick cylinder wall.

[0056] Further, according to the simplified model shown in Figure 6 , the strength and stiffness of the uniform loading plate 4 are calculated. First, the uniform loading plate 4 is further subdivided, i.e. the area Sa of the uniform loading plate 4 is reduced. If the strength or stiffness is insufficient, it can be strengthened by adding diagonal bracing between the uniform loading plate 4 and the force applying part 3, and using steel instead; when the axial tensile stress of the pile pit 8 makes it difficult to strengthen the loading plate, the coupling effect of the uniform loading plate 4 and the cylinder wall of the pile pit 8 is considered in the calculation model, and a simplified model of the cylinder wall of the pile pit 8 is established.

[0057] Further, as shown in Figure 6 , between the uniform loading plate 4 and the inner wall of the pile pit 8, and between the side surfaces of the uniform loading plate 4, a movable smooth material can be lined, which bears radial pressure and forms a lubricating layer in the circumferential direction; generally, the smooth material can be selected according to the pressure calculated above to form a gasket of matching shape, and the smooth material can be a plastic such as polytetrafluoroethylene, graphite or silicon nitride ceramic material; on the multiple interfaces formed between the uniform loading plate 4, the gasket and the inner wall of the pile pit 8, semi-liquid lubricating substances such as film lubricating oil are added to further reduce the circumferential constraint friction force.

[0058] As shown in Figure 6 , the surface of the uniform loading plate 4 is machined to form a groove in the horizontal direction of the axial expansion of the cylinder wall, which can reduce the friction area, accommodate the smeared lubricating substances or scattered smooth material debris, and further increase the lubricating performance of the interface.

[0059] Further, the oil tank 1 is fixed to the transverse support column 7.

[0060] Further, the process of the hydraulic pump 2 applying force to the pile pit 8 is recorded by a high-speed camera system.

[0061] Further, the sensor 9 comprises: an array type flexible film pressure sensor 91 and / or a displacement sensor 92.

[0062] Further, sensors 9 are arranged inside and outside the heap pit 8, including: The arrayed flexible thin film pressure sensor 91 is arranged between the uniform loading plate 4 and the inner side surface of the heap pit 8 for measuring uniform pressure; The displacement sensor 92 is arranged outside the heap pit 8 for measuring the structural displacement of the heap pit 8.

[0063] In summary, from the above description, the above-mentioned embodiments of the present application achieve the following technical effects: 1. The present application proposes a heap pit uniform loading test device and method, which constructs a set of hydraulic loading system suitable for heap pit structure inner wall loading test through the organic cooperation of oil tank, hydraulic pump, multiple force applying parts and uniform loading plate; wherein the oil tank is provided with hydraulic oil, the hydraulic pump is in fluid communication with the oil tank through pipeline to form a complete pressure supply circuit; multiple force applying parts are arranged radially along the hydraulic pump, which can synchronously apply force to the inner wall of the heap pit in multiple directions, and are detachably connected with the hydraulic pump, which is convenient for system installation, disassembly and maintenance; the uniform loading plate is arranged along the inner side of the heap pit and connected with the multiple force applying parts, which can uniformly transmit the force from the force applying part to the surface of the heap pit structure; the device designed by the present application effectively solves the technical problems that the existing loading device is difficult to adapt to the cylindrical heap pit structure, the loading mode is locally concentrated, and the circumferential uniform loading cannot be realized, and can provide stable and uniform loading effect under the simulation of explosion load or high pressure working condition.

[0064] 2. The present application proposes a heap pit uniform loading test device and method, which arranges multiple force applying parts on the axial end of the hydraulic pump and its circular cross section and generatrix direction to form a multi-directional and uniform loading system for the heap pit structure, wherein the force applying parts on the circular cross section are distributed in a ring around the hydraulic pump, which can realize symmetrical loading at multiple angles of the inner wall of the heap pit, and the force applying parts in the generatrix direction make the force act uniformly along the vertical direction of the heap pit, which helps to simulate the diffusion trend of explosion load in space. By reasonably setting the number of force applying parts, not only the distribution density and uniformity of loading are improved, but also flexible configuration according to different heap pit model size and experimental requirements is realized, which takes into account the structural complexity and control accuracy. This design improves the adaptability of the loading system to complex heap pit geometry, and provides reliable support for real and uniform simulation of explosion load.

[0065] 3.The application provides a kind of pile pit uniform loading test device and method, by hydraulic pump to hydraulic oil pressurization, and by means of hydraulic cylinder and piston rod power conversion mechanism, realize the radial drive of forcing part and controllable loading output.Hydraulic cylinder passes through the slot through structure to improve the stroke length and structural arrangement flexibility of loading component;The device of the application effectively realizes the continuous force transmission path from hydraulic pump, hydraulic oil, hydraulic cylinder, piston rod to loading plate, with good power closure, response controllability and loading consistency, compared with the existing local loading method, the application is through structure integration and force transmission path design, so that the loading system can stably output larger and uniformly distributed radial force, especially suitable for the loading demand of pile pit structure such as cylindrical, high stiffness, large size complex system.

[0066] 4.The application provides a kind of pile pit uniform loading test device and method, by array type flexible film pressure sensor and displacement sensor arranged in and outside the pile pit, realize real-time monitoring of stress and strain during loading;Combined with high-speed camera system to record the whole process of loading process, multi-modal, high-precision data acquisition and loading control can be realized, effectively overcoming the problems of high cost, poor precision and non-repeatability of existing explosion test method;The test method in the application not only ensures the controllability and repeatability of loading state, but also significantly improves the spatial resolution of loading data and experimental reliability, providing an advanced, efficient and systematic test method for dynamic response evaluation of pile pit structure.

[0067] The above only describes the preferred embodiments of the present application and is not intended to limit the present application.

[0068] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0069] It should be noted that in the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The illustrative representation of the above terms in the present specification does not necessarily refer to the same embodiment or example. Moreover, the specific feature, structure, material or characteristic described can be combined in any suitable manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

Claims

1. A crater-distributed loading test device, characterized in that, It includes an oil tank (1), a hydraulic pump (2), multiple force-applying parts (3) and a uniformly distributed loading plate (4). The oil tank (1) contains hydraulic oil (11). The oil tank (1) is fluidly connected to the hydraulic pump (2) through a connecting pipe (5). The force-applying parts (3) are arranged radially outside the hydraulic pump (2). The force-applying parts (3) are detachably connected to the hydraulic pump (2). The uniformly distributed loading plate (4) is arranged along the inner surface of the pile pit (8). The uniformly distributed loading plate (4) is detachably connected to the force-applying parts (3).

2. The apparatus according to claim 1, characterized in that, It also includes, One of the force-applying parts (3) is disposed at the end of the hydraulic pump (2) along the axial direction of the hydraulic pump (2).

3. The apparatus according to claim 1, characterized in that, The hydraulic pump (2) is a cylinder, and a plurality of force-applying parts (3) are evenly distributed on a circular cross section of the hydraulic pump (2); the plurality of force-applying parts (3) are evenly distributed along a generatrix of the hydraulic pump (2).

4. The apparatus according to claim 3, characterized in that, Three to eight force-applying parts (3) are provided on one circular cross section of the hydraulic pump (2); two to ten force-applying parts (3) are provided on one busbar of the hydraulic pump (2).

5. The apparatus according to claim 1, characterized in that, The hydraulic pump (2) is used to pressurize the hydraulic oil (11) so that the hydraulic oil (11) transmits force to the contacting force-applying part (3) to drive a portion of the force-applying part (3) to move radially along the hydraulic pump (2).

6. The apparatus according to claim 5, characterized in that, The force-applying part (3) includes a hydraulic cylinder (31). The hydraulic cylinder (31) is fluidly connected to the hydraulic pump (2).

7. The apparatus according to claim 6, characterized in that, The hydraulic cylinder (31) includes a through groove (311). The through groove (311) extends radially through both ends of the hydraulic cylinder (31).

8. The apparatus according to claim 7, characterized in that, The force-applying part (3) includes a piston rod (32). The piston rod (32) is drivably disposed in the through groove (311), and the piston rod (32) is driven to move axially along the through groove (311) by the hydraulic pump (2) applying force to the internal hydraulic oil (11).

9. The apparatus according to claim 1, characterized in that, It also includes vertical support columns (6) and horizontal support columns (7). The horizontal support column (7) is connected to the two vertical support columns (6).

10. The apparatus according to claim 9, characterized in that, The oil tank (1) is fixed to the transverse support column (7).

11. The apparatus according to claim 1, characterized in that, The force-applying part (3) is connected to the geometric center of the uniformly distributed loading plate (4).

12. A test method based on the uniformly distributed loading test apparatus according to any one of claims 1-11, characterized in that, include: The uniformly distributed loading plate (4) is attached to the inner surface of the pile pit (8), the force application part (3) is installed on the hydraulic pump (2), the hydraulic pump (2) is placed inside the pile pit (8), and the force application part (3) is fixed at the corresponding position of the uniformly distributed loading plate (4). Sensors (9) are installed inside and outside the pile pit (8), the hydraulic pump (2) is started, and data is collected through the sensors (9).

13. The method according to claim 12, characterized in that, Also includes: The oil tank (1) is fixed to the horizontal support column (7).

14. The method according to claim 12, characterized in that, Also includes: The process of the hydraulic pump (2) applying force to the pile pit (8) is recorded by a high-speed camera system.

15. The method according to claim 12, characterized in that, The sensor (9) includes: Array-type flexible thin-film pressure sensor (91) and / or displacement sensor (92).

16. The method according to claim 15, characterized in that, Sensors (9) are installed inside and outside the pile pit (8), including: The array-type flexible thin-film pressure sensor (91) is placed between the inner surface of the uniformly distributed loading plate (4) and the pile pit (8) to measure the uniformly distributed pressure; The displacement sensor (92) is placed outside the pit (8) to measure the structural displacement of the pit (8).

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