Pressure pipeline connecting pipe load applying device and method

Abstract

The invention provides a pressure pipeline connecting pipe load applying device and method, and relates to the technical field of pressure pipeline anti-seismic tests.The pressure pipeline connecting pipe load applying device comprises a pressure container test piece, a loading connecting pipe, a counter-force support and a load applying mechanism; the inlet end and the outlet end of the pressure vessel test piece are connected with loading connecting pipes, and each loading connecting pipe is provided with an axial force bearing position, a vertical shear force bearing position, a horizontal shear force bearing position and a torque bearing position; load applying mechanisms are arranged at the positions, corresponding to all the bearing positions, of the counter-force support, and the loading ends of the load applying mechanisms can perpendicularly abut against the corresponding bearing positions. The pressure vessel test piece, the loading connecting pipe, the counter-force support and the load applying mechanism are matched with one another, different connecting pipe loads (axial force, shearing force, torque and bending moment) can be accurately applied, and the device can be used for designing an internal pressure environment and a vibration table anti-seismic test of a pressure pipeline under the action of different connecting pipe loads.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic testing of pressure pipelines, and in particular to a device and method for applying load to a pipe connecting pipe of a pressure pipeline. Background Art

[0002] Nuclear power plant equipment, such as pumps and chillers, is specifically designated as Class I seismic equipment based on its design and functional requirements. Class I equipment must undergo a seismic assessment before design finalization to ensure its structural integrity and functional integrity under earthquake conditions. According to relevant regulations, testing should be used during the initial seismic assessment of active mechanical or electrical equipment.

[0003] In a reactor layout, pumps, chillers, and other components are connected through piping to form a loop system to achieve their designed functions and ensure the safe and normal operation of the reactor. When installed within the operating loop, these devices are subject to loads such as temperature differences and earthquakes, generating loads such as axial forces, shear forces, bending moments, and torque at the equipment connections. Currently, during seismic qualification testing, it's impossible to construct a piping system that is identical to the actual operation of the reactor. Therefore, the connection loads at the equipment connections cannot be determined from the actual piping system.

[0004] Therefore, in the seismic identification test of equipment, in order to verify the impact of the take-over load on the equipment and ensure the conservatism of the test, it is necessary to apply the take-over load through a simulation device. Summary of the Invention

[0005] The purpose of the present invention is to provide a pressure pipe take-over load application device and method to solve the above-mentioned technical problems existing in the prior art; the preferred technical solution among the many technical solutions provided by the present invention can produce many technical effects; please refer to the following for details.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a pressure pipeline pipe load application device, which includes a pressure vessel test piece, a loading connecting pipe, a reaction force support and a load application mechanism, wherein: the inlet end and the outlet end of the pressure vessel test piece are both connected with a loading connecting pipe, and the loading connecting pipe is provided with a bearing position, and the bearing position includes an axial force bearing position, a vertical shear force bearing position, a horizontal shear force bearing position and a torque bearing position; the positions corresponding to all the bearing positions on the reaction force support are provided with a load application mechanism, and the loading end of the load application mechanism can be vertically abutted against the corresponding bearing position.

[0008] Preferably, an end plate is provided at the end of the loading connecting pipe away from the pressure vessel test piece, and the end plate forms the axial force bearing position; any position of the top surface of the loading connecting pipe along the axial direction can form the vertical shear force bearing position; any position of the side surface of the loading connecting pipe along the axial direction can form the horizontal shear force bearing position; the end of the loading connecting pipe away from the pressure vessel test piece is symmetrically provided with two bearing plates along the axis of the loading connecting pipe, and the bearing plates form the torque bearing position.

[0009] Preferably, the reaction support is configured as a box structure, which is open toward one side of the pressure vessel test piece; a bottom plate is provided at the bottom of the box structure; and a reinforcing rib plate is connected between the bottom plate and the side wall of the box structure.

[0010] Preferably, the load applying mechanism includes a mounting member, a connecting member, an adjusting member and an elastic pressure head assembly, wherein: the mounting member is fixedly arranged on the reaction force bracket through the connecting member; the elastic pressure head assembly is located between the mounting member and the loading connecting pipe; the adjusting member is movably arranged on the mounting member, and the adjusting member can adjust the compression value of the elastic pressure head assembly to adjust the force of the elastic pressure head assembly on the loading connecting pipe.

[0011] Preferably, the elastic pressure head assembly includes an upper abutment assembly, an elastic member and a lower abutment assembly, wherein: the abutment end of the adjusting member abuts against the upper abutment assembly; the elastic member is arranged between the upper abutment assembly and the lower abutment assembly; and the lower abutment assembly abuts against the loading connecting pipe.

[0012] Preferably, the load applying mechanism further includes a force sensor for detecting the elastic force of the elastic member.

[0013] The present invention provides a method for applying a pipe load using any of the aforementioned pressure pipe pipe load applying devices, comprising at least the following steps:

[0014] Step S1, installing the pressure pipe load application device on an earthquake simulation vibration table;

[0015] Step S2, determining the input loading values ​​of each load applying mechanism and the positions of the vertical shear bearing position and the horizontal shear bearing position according to the nozzle load values ​​at the inlet and outlet ends of the pressure vessel test piece after the superposition of the seismic load;

[0016] Step S3 , causing the corresponding load applying mechanism to act on the axial force bearing position, the vertical shear force bearing position, the horizontal shear force bearing position and the torque bearing position with corresponding input loading values.

[0017] Preferably, in step S2, determining the input loading value of each load applying mechanism according to the nozzle load values ​​at the inlet and outlet ends of the pressure vessel test piece after the superposition of the seismic load includes:

[0018] Step S201, determining a theoretical load value of the connecting end face of the loading connecting pipe according to the connecting pipe load values ​​at the inlet and outlet ends of the pressure vessel test piece after superimposing the seismic load;

[0019] Step S202, establishing a three-dimensional finite element model of the pressure pipe connection load applying device;

[0020] Step S203, inputting the load theoretical value into the three-dimensional finite element model to calculate the internal force calculated value of the connecting end face of the loading connecting pipe under the action of an earthquake;

[0021] Step S204 : determining the input loading value of each load applying mechanism by comparing the deviation between the theoretical load value and the calculated internal force value.

[0022] Preferably, in step S204, determining the input loading value of each load applying mechanism includes:

[0023] If the deviation is not greater than a predetermined error, the input loading value can be determined by the calculated internal force value;

[0024] If the deviation is greater than the predetermined error, the theoretical load value is scaled, and step S203 is repeated until the deviation is no greater than the predetermined error.

[0025] Preferably, the load values ​​of the pipes at the inlet and outlet ends of the pressure vessel test piece after the superimposed earthquake load include axial force p, shear force V, bending moment M b and torque M t .

[0026] The pressure pipe connection load application device and method provided by the present invention have at least the following beneficial effects:

[0027] The pressure pipeline take-off load application device includes a pressure vessel test piece, a loading connecting pipe, a reaction force bracket and a load application mechanism. The pressure vessel test piece, the loading connecting pipe, the reaction force bracket and the load application mechanism cooperate with each other to simulate the take-off load application of the pipeline system to be tested.

[0028] The inlet and outlet ends of the pressure vessel test piece are connected with a loading connecting pipe, and the loading connecting pipe is provided with a bearing position, which includes an axial force bearing position, a vertical shear force bearing position, a horizontal shear force bearing position and a torque bearing position. The positions corresponding to all the bearing positions on the reaction support are provided with a load applying mechanism; during the test, the loading end of the load applying mechanism can be vertically abutted against the corresponding bearing position, so as to accurately apply different connecting pipe loads (axial force, shear force, torque and bending moment), thereby ensuring the seismic test effect of the pressure pipeline.

[0029] The present invention can accurately apply different pipe loads (axial force, shear force, torque and bending moment) by cooperating with the pressure vessel test piece, the loading connecting pipe, the reaction support and the load application mechanism, effectively simulating the pipe load application of the pipeline system to be tested, and providing a guarantee for the seismic test effect of the pressure pipeline.

[0030] The present invention can be used to design vibration table seismic tests of pressure pipelines under internal pressure environments and different pipe loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic structural diagram of a pressure pipe connection load applying device according to the present invention;

[0033] Figure 2 It is a structural schematic diagram of the loading connecting pipe and the load applying mechanism of the present invention;

[0034] Figure 3 It is a structural schematic diagram of the reaction support of the present invention;

[0035] Figure 4 It is a structural schematic diagram of the load applying mechanism of the present invention;

[0036] Figure 5 is a schematic cross-sectional view of the load applying mechanism of the present invention;

[0037] Figure 6 Schematic diagram of load loading of the present invention.

[0038] Reference numerals

[0039] 1. Pressure vessel test piece; 2. Loading connecting pipe; 21. Axial force bearing position; 22. Vertical shear bearing position; 23. Horizontal shear bearing position; 24. Torque bearing position; 3. Reaction support; 31. Box structure; 32. Bottom plate; 33. Reinforcement plate; 4. Load applying mechanism; 41. Mounting part; 411. Mounting plate; 42. Connecting part; 421. Connecting bolt; 43. Adjusting part; 431. Adjusting bolt; 44. Elastic pressure head assembly; 441. Upper abutment assembly; 4411. Pressure head; 4412. Upper abutment; 4413. Force sensor; 442. Elastic part; 443. Lower abutment; 444. Upper mounting column; 445. Lower mounting column. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0041] Example 1:

[0042] The present invention provides a pressure pipe connection load applying device, referring to Figures 1 to 6 As shown, the pressure pipe connecting pipe load applying device includes a pressure vessel test piece 1, a loading connecting pipe 2, a reaction force support 3 and a load applying mechanism 4.

[0043] The pressure vessel test piece 1 can be a device with a takeover load, such as a pump or a valve. The inlet and outlet ends of the pressure vessel test piece 1 are both connected with a loading connecting pipe 2, and the loading connecting pipe 2 is provided with a bearing position, which includes an axial force bearing position 21, a vertical shear force bearing position 22, a horizontal shear force bearing position 23 and a torque bearing position 24.

[0044] The positions of the reaction support 3 corresponding to all the bearing positions are provided with load applying mechanisms 4 , and the loading ends of the load applying mechanisms 4 can be vertically abutted against the corresponding bearing positions.

[0045] Specifically, an end plate is provided at the end of the loading connecting pipe 2 away from the pressure vessel test piece 1, and the end plate forms an axial force bearing position 21. Any position of the top surface of the loading connecting pipe 2 along the axial direction can form a vertical shear force bearing position 22; any position of the side surface of the loading connecting pipe 2 along the axial direction can form a horizontal shear force bearing position 23. The end of the loading connecting pipe 2 away from the pressure vessel test piece 1 is symmetrically provided with two bearing plates along the axis of the loading connecting pipe 2, and the bearing plates form a torque bearing position 24.

[0046] In the actual application process, take the import end as an example:

[0047] The force applied by the load applying mechanism 4 to the axial force bearing position 21 is the axial force F x .

[0048] The force applied by the load applying mechanism 4 to the vertical shear bearing position 22 is the shear force F y .

[0049] The force applied by the load applying mechanism 4 to the horizontal shear bearing position 23 is the shear force F z .

[0050] The distance between the connecting end surface of the inlet end and the loading connecting pipe 2 and the vertical shear force bearing position 22 is related to the shear force F y The product of is the bending moment M z .

[0051] The distance between the connecting end surface of the inlet end and the loading connecting pipe 2 and the horizontal shear force bearing position 23 is related to the shear force F z The product of is the bending moment M y .

[0052] The force applied by the load applying mechanism 4 to the torque bearing position 24 is F z1 , the distance between the vertical center lines of the two torque bearing positions 24 is equal to F z1 The product of is the torque M z .

[0053] Since axial force, shear force, bending moment and torque are components of internal force, the above axial force F x , shear force F y , shear force F z , bending moment M y , bending moment M z , torque M x The internal force to be applied during the test can be obtained, and the effect of applying the pipe load is significant.

[0054] In addition, during the actual test, by adjusting the magnitude of the force of each load applying mechanism 4 and the position of the vertical shear bearing position 22 and the horizontal shear bearing position 23, the corresponding required internal force can be obtained, which has a wide range of applications.

[0055] The present invention can realize the connection load (axial force F x , shear force F y , shear force F z , bending moment M y , bending moment M z , torque M x) can be used to design internal pressure environment and vibration table seismic test of pressure pipelines under different pipe loads.

[0056] As an optional implementation, the loading connecting pipe 2 is made of Q345 steel and can be a square tube or a round tube, preferably a square tube for easy alignment.

[0057] As an optional embodiment, the reaction support 3 is configured as a box structure 31, the side of the box structure 31 facing the pressure vessel test piece 1 is open, and the end of the loading connecting pipe 2 away from the pressure vessel test piece 1 is inserted into the interior of the box structure 31 along the opening, so that the load applying mechanism 4 is conveniently installed to the corresponding load-bearing position.

[0058] A bottom plate 32 is provided at the bottom of the box structure 31 , and a mounting hole for mounting on an earthquake simulation vibration table is provided on the bottom plate 32 .

[0059] A reinforcing rib plate 33 is connected between the bottom plate 32 and the side wall of the box structure 31 . Specifically, the reinforcing rib plate 33 is a triangular rib plate.

[0060] The reaction support 3 bears the reaction force when the load is applied, and the provision of the reinforcing rib 33 can effectively improve the structural strength of the reaction support 3.

[0061] The reaction support 3 has a design fundamental frequency greater than 50 Hz, and is used to provide the overall stiffness of the pressure vessel pipe load application device.

[0062] As an optional embodiment, the load applying mechanism 4 includes a mounting member 41 , a connecting member 42 , an adjusting member 43 and an elastic pressing head assembly 44 .

[0063] The mounting member 41 is fixedly mounted on the reaction support 3 via the connecting member 42 ; the elastic pressure head assembly 44 is located between the mounting member 41 and the loading connecting pipe 2 ; the adjusting member 43 is movably mounted on the mounting member 41 and is in transmission connection with the elastic pressure head assembly 44 .

[0064] During actual use, the compression value of the elastic pressure head assembly 44 is adjusted by the adjusting member 43 , thereby achieving the adjustment of the force exerted by the elastic pressure head assembly 44 on the corresponding bearing position.

[0065] As an optional embodiment, the elastic pressure head assembly 44 includes an upper abutment assembly 441, an elastic member 442 and a lower abutment member 443, the abutment end of the adjustment member 43 abuts against the upper abutment assembly 441; the elastic member 442 is arranged between the upper abutment assembly 441 and the lower abutment member 443; the lower abutment member 443 abuts against the loading connecting pipe 2.

[0066] Specifically, the mounting member 41 is configured as a mounting plate 411, a threaded hole is provided on the mounting plate 411, the connecting member 42 is configured as a connecting bolt 421, and the adjusting member 43 is configured as an adjusting bolt 431. The mounting plate 411 is installed on the outer wall of the reaction support 3 through the connecting bolt 421, and the adjusting bolt 431 passes through the threaded hole and is inserted into the interior of the reaction support 3. The adjusting bolt 431 abuts against the upper abutment assembly 441.

[0067] When adjusting the compression value of the elastic member 442 , the adjusting bolt 431 is rotated, and the adjusting bolt 431 moves axially, thereby pushing the upper abutting assembly 441 to move, thereby achieving the adjustment of the compression value of the elastic member 442 .

[0068] The upper abutment assembly 441 includes a pressure head 4411 that abuts against the adjusting member 43, and an upper abutment member 4412 arranged below the pressure head 4411. The elastic member 442 adopts a spring. To ensure its firm installation, an upper mounting column 444 is provided at the bottom of the upper abutment member 4412, and a lower mounting column 445 is provided at the top of the lower abutment member 443. The top and bottom ends of the elastic member 442 are respectively mounted on the upper mounting column 444 and the lower mounting column 445.

[0069] As an optional embodiment, the load applying mechanism 4 further includes a force sensor 4413 capable of detecting the elastic force of the elastic member 442 .

[0070] A mounting groove is provided on the top of the upper abutment member 4412 . The force sensor 4413 is installed in the mounting groove and protrudes 5 mm from the surface of the mounting groove. The bottom of the pressure head 4411 abuts against the force sensor 4413 .

[0071] During the test, the force sensor 4413 detects the elastic force of the elastic member 442 in real time, thereby monitoring the change of the load acting on the pipe.

[0072] Example 2

[0073] Example 2 is based on Example 1:

[0074] The present invention provides a method for applying a pipe load using the pressure pipe pipe load applying device, comprising the following steps:

[0075] Step S1, installing the pressure pipe load application device on an earthquake simulation vibration table;

[0076] Specifically, threaded connectors are used to anchor the pressure vessel test piece 1 on the earthquake simulation vibration table, internal pressure is applied to the pressure vessel test piece 1 and maintained, connecting flanges are used to connect the two loading connecting pipes 2 to the inlet and outlet ends of the pressure vessel test piece 1 respectively, and threaded connectors are used to anchor the reaction force support 3 on the earthquake simulation vibration table. It is necessary to ensure that the reaction force support 3, the loading connecting pipe 2 and the pressure vessel test piece 1 are on the same axis, and then the load applying mechanism 4 is installed.

[0077] Step S2, determining the input loading values ​​of each load applying mechanism 4 and the positions of the vertical shear bearing position 22 and the horizontal shear bearing position 23 according to the nozzle load values ​​at the inlet and outlet ends of the pressure vessel test piece 1 after the superposition of the seismic load;

[0078] The input loading value of the load applying mechanism 4 divided by the stiffness coefficient of the elastic member 442 is the theoretical compression value of the elastic pressing head assembly 44 .

[0079] In step S3 , the corresponding load applying mechanism 4 is enabled to act on the axial force bearing position 21 , the vertical shear force bearing position 22 , the horizontal shear force bearing position 23 and the torque bearing position 24 with corresponding input loading values.

[0080] Example 3

[0081] Example 3 is based on Example 2:

[0082] Taking into account the influence of the seismic inertia force, in step S2, the step of determining the input loading values ​​of each load applying mechanism 4 according to the nozzle load values ​​at the inlet and outlet ends of the pressure vessel test piece 1 after the superposition of the seismic load includes:

[0083] Step S201, determining a theoretical load value for the connecting end face of the connecting pipe 2 based on the connecting pipe load values ​​at the inlet and outlet ends of the pressure vessel test piece 1 after superimposing the seismic load;

[0084] Step S202, establishing a three-dimensional finite element model of the pressure pipe connection load application device, and calculating working conditions including deadweight, internal pressure and seismic load;

[0085] Taking pressure vessel specimen 1 as an example, where the fundamental frequency exceeds 33 Hz, the seismic action can be analyzed using the pseudo-static method. The response spectrum value at this frequency is obtained from the target response spectrum (based on the peak accelerometer). This acceleration response spectrum value is applied to the entire model to account for the impact of the seismic action.

[0086] Step S203, inputting the load theoretical value into the three-dimensional finite element model to calculate the internal force calculated value of the connecting end face of the loading connecting pipe 2 under the action of an earthquake;

[0087] Step S204 : determining the input loading value of each load applying mechanism 4 by comparing the deviation between the theoretical load value and the calculated internal force value.

[0088] Specifically, if the deviation is not greater than a predetermined error, the input loading value can be determined by the calculated internal force value;

[0089] If the deviation is greater than the predetermined error, the theoretical load value is scaled, and step S203 is repeated until the deviation is no greater than the predetermined error.

[0090] Preferably, the predetermined error is within 5% of the theoretical load value.

[0091] As an optional embodiment, the load values ​​of the pipes at the inlet and outlet ends of the pressure vessel test piece 1 after the superimposed earthquake load include axial force p, shear force V, bending moment M b and torque M t , axial force F X =P; shear force F y =F z =(V 2 / 2) 1 / 2 Bending moment M y =M z =(M b / 2) 1 / 2 ; Torque M x =M t ;

[0092] In step S201, the theoretical load value of the connecting end face of the connecting pipe 2 is determined based on the connecting pipe load values ​​at the inlet and outlet ends of the pressure vessel test piece 1 after the superposition of the seismic load, as follows:

[0093] According to the above formula, the axial force F can be directly obtained x , shear force F y , shear force F z , thereby obtaining the theoretical compression value of the elastic pressure head assembly 44 of the load applying mechanism 4 corresponding to the axial force bearing position and the shear force bearing position;

[0094] Due to the bending moment M y =F z *L1, therefore according to F z L1 can be calculated, where L1 is the distance between the connection end face of the loading connection pipe 2 and the vertical shear force bearing position 22, and thus the position of the vertical shear force bearing position 22 can be obtained;

[0095] Due to the bending moment M y =M z , shear force F y =F z , thus, F yIt also acts on the position L1, that is, the distance between the connection end face of the loading connecting pipe 2 and the horizontal shear force bearing position 23 is also L1, thereby obtaining the position of the horizontal shear force bearing position 23;

[0096] Due to the twisting M z =F z1 *L2, L2 is the distance between the vertical center lines of the two torque bearing positions 24, which is a constant value. Therefore, the couple F of the force arm L2 can be obtained by calculation. z1 and F z2 , thereby obtaining the theoretical compression value of the elastic pressure head assembly 44 of the load applying mechanism 4 corresponding to the torque bearing position 24.

[0097] The method for applying the pipe load of the present invention can not only realize the pipe load (axial force F x , shear force F y , shear force F z , bending moment M y , bending moment M z , torque M x ) is applied, and the load force of the pipe is adjusted by three-dimensional finite element analysis, which can effectively reflect the impact of the actual earthquake inertia force on the system; the load application effect is significant and can effectively ensure the test effect.

[0098] In the description of this application, it should be understood that the terms "upper", "lower", "inside", "outside", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0099] In addition, in the description of the present application, the terms "multiple" and "several" mean at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0100] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0101] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A pressure pipe connection load applying device, characterized in that: It includes a pressure vessel test piece, a loading connecting pipe, a reaction force support and a load applying mechanism, wherein: The inlet and outlet ends of the pressure vessel test piece are both connected to a loading connection pipe, and the loading connection pipe is provided with a bearing position, which includes an axial force bearing position, a vertical shear force bearing position, a horizontal shear force bearing position and a torque bearing position; The positions of the reaction force support corresponding to all the bearing positions are provided with load applying mechanisms, and the loading ends of the load applying mechanisms can vertically abut against the corresponding bearing positions.

2. The pressure pipe connection load applying device according to claim 1, characterized in that: An end plate is provided at the end of the loading connecting pipe away from the pressure vessel test piece, and the end plate forms the axial force bearing position; Any position of the top surface of the loading connecting pipe along the axial direction can form the vertical shear force bearing position; Any position along the axial direction on the side surface of the loading connecting pipe can form the horizontal shear force bearing position; Two bearing plates are symmetrically provided at the end of the loading connecting pipe away from the pressure vessel test piece along the axis of the loading connecting pipe, and the bearing plates form the torque bearing position.

3. The pressure pipe connection load applying device according to claim 1, characterized in that: The reaction force support is configured as a box structure, and the box structure is open toward one side of the pressure vessel test piece; A bottom plate is provided at the bottom of the box structure; A reinforcing rib plate is connected between the bottom plate and the side wall of the box structure.

4. The pressure pipe connection load applying device according to claim 1, characterized in that: The load applying mechanism includes a mounting member, a connecting member, an adjusting member and an elastic pressing head assembly, wherein: The mounting member is fixedly arranged on the reaction force bracket via the connecting member; The elastic pressure head assembly is located between the mounting member and the loading connection pipe; The adjusting member is movably arranged on the mounting member, and the adjusting member can adjust the compression value of the elastic pressure head assembly to adjust the force of the elastic pressure head assembly on the loading connecting pipe.

5. The pressure pipe connection load applying device according to claim 4, characterized in that: The elastic pressing head assembly includes an upper abutment assembly, an elastic member and a lower abutment member, wherein: The abutting end of the adjusting member abuts against the upper abutting assembly; The elastic member is arranged between the upper abutment assembly and the lower abutment member; The lower abutment member abuts against the loading connection pipe.

6. The pressure pipe connection load applying device according to claim 4, characterized in that: The load applying mechanism further includes a force sensor for detecting the elastic force of the elastic member.

7. A method for applying a pipe load to a pressure pipe using the pressure pipe load applying device according to any one of claims 1 to 6, characterized in that: At least the following steps are included: Step S1, installing the pressure pipe load application device on an earthquake simulation vibration table; Step S2, determining the input loading values ​​of each load applying mechanism and the positions of the vertical shear bearing position and the horizontal shear bearing position according to the nozzle load values ​​at the inlet and outlet ends of the pressure vessel test piece after the superposition of the seismic load; Step S3 , causing the corresponding load applying mechanism to act on the axial force bearing position, the vertical shear force bearing position, the horizontal shear force bearing position and the torque bearing position with corresponding input loading values.

8. The method for applying a load to a nozzle according to claim 7, characterized in that: In step S2, determining the input loading values ​​of each load applying mechanism according to the nozzle load values ​​at the inlet and outlet ends of the pressure vessel test piece after the superposition of the seismic load includes: Step S201, determining a theoretical load value of the connecting end face of the loading connecting pipe according to the connecting pipe load values ​​at the inlet and outlet ends of the pressure vessel test piece after superimposing the seismic load; Step S202, establishing a three-dimensional finite element model of the pressure pipe connection load applying device; Step S203, inputting the load theoretical value into the three-dimensional finite element model to calculate the internal force calculated value of the connecting end face of the loading connecting pipe under the action of an earthquake; Step S204 : determining the input loading value of each load applying mechanism by comparing the deviation between the theoretical load value and the calculated internal force value.

9. The method for applying a load to a nozzle according to claim 8, characterized in that: In step S204, determining the input loading value of each load applying mechanism includes: If the deviation is not greater than a predetermined error, the input loading value can be determined by the calculated internal force value; If the deviation is greater than the predetermined error, the theoretical load value is scaled, and step S203 is repeated until the deviation is no greater than the predetermined error.

10. The method for applying a load to a nozzle according to claim 7, wherein: The load values ​​of the nozzles at the inlet and outlet of the pressure vessel test piece after the superimposed earthquake load include axial force p, shear force V, bending moment M b and torque M t .

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