Simulation experiment device and simulation experiment method for pipeline settlement of three-phase common-box gas insulated transmission line

Abstract

The embodiment of the invention provides a three-phase common-box gas insulated transmission line pipeline settlement simulation experiment device and a simulation experiment method. The device comprises a basic pipeline module, a set number of hydraulic jacks, a displacement monitoring unit, a strain monitoring unit, a pressure monitoring unit, an image acquisition unit and a data processing unit, the basic pipeline module comprises a steel structure support and a three-phase common-box gas insulated transmission line GIL pipeline, the steel structure support is fixed to a concrete foundation through bolts, and the steel structure support is rigidly connected with a shell flange of the three-phase common-box GIL pipeline through bolts; the hydraulic jacks are symmetrically mounted at the midpoint under the three-phase common-box GIL pipeline, and the hydraulic jacks are used for lifting the three-phase common-box GIL pipeline according to a set loading rate until a loading termination condition is met. By means of the device, effective simulation of the three-phase common-box GIL pipeline settlement influence can be achieved, and a basis is provided for pipeline structure evaluation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and in particular to a three-phase common-box gas-insulated transmission line pipe settlement simulation experiment device and a simulation experiment method. BACKGROUND

[0002] With the rapid development of urban underground power transmission projects in the direction of large-scale and intensive, the three-phase common-box gas-insulated metal-enclosed transmission line (GIL) has become the core carrier of cross-regional energy transmission due to its outstanding transmission capacity advantage and low failure rate characteristics. The three-phase common-box design significantly improves the space utilization in the ultra-high voltage underground power transmission project.

[0003] However, under complex geological conditions, the uneven settlement problem of the tunnel caused by factors such as shield construction disturbance and underground water loss is increasingly prominent. Such settlement can significantly affect the sealing performance of the flange connection of the GIL pipe, threatening the sealing and insulation performance of the insulation gas, and further affecting the safe and stable operation of the power transmission system. Therefore, a method is needed to solve the above problems. SUMMARY

[0004] The embodiment of the present application provides a three-phase common-box gas-insulated transmission line pipe settlement simulation experiment device and a simulation experiment method, which realizes effective simulation of the influence of three-phase common-box GIL pipe settlement, and provides a basis for pipe structure evaluation.

[0005] In a first aspect, the embodiment provides a three-phase common-box gas-insulated transmission line pipe settlement simulation experiment device, which comprises a basic pipe module, a set number of hydraulic jacks, a displacement monitoring unit, a strain monitoring unit, a pressure monitoring unit, an image acquisition unit and a data processing unit.

[0006] The basic pipe module comprises a steel structure support and a three-phase common-box gas-insulated transmission line GIL pipe, the steel structure support is fixed with the concrete foundation through bolts, and the steel structure support is rigidly connected with the outer shell flange of the three-phase common-box GIL pipe through bolts.

[0007] The hydraulic jacks are symmetrically installed at the midpoint directly below the three-phase common-box GIL pipe, and are used to lift the three-phase common-box GIL pipe at a set loading rate until the loading termination condition is reached.

[0008] The displacement monitoring unit is arranged on the outer wall of the three-phase common-box GIL pipe, and is used to monitor the settlement displacement data of each first monitoring point on the three-phase common-box GIL pipe in real time.

[0009] The strain monitoring unit is arranged on the outer wall of the three-phase common-tank GIL pipeline and is used for monitoring strain data of each second monitoring point on the three-phase common-tank GIL pipeline in real time.

[0010] The pressure monitoring unit is arranged inside the three-phase common-tank GIL pipeline and is used for monitoring pressure data in the three-phase common-tank GIL pipeline in real time.

[0011] The image acquisition unit is used for capturing deformation image data of the three-phase common-tank GIL pipeline during lifting of the three-phase common-tank GIL pipeline by the hydraulic jack.

[0012] The data processing unit is used for receiving the strain data, the settlement displacement data, the pressure data and the deformation image data, and analyzing the strain data, the settlement displacement data, the pressure data and the deformation image data to evaluate the structural bearing capacity of the three-phase common-tank GIL pipeline.

[0013] In a second aspect, the embodiment provides a three-phase common-tank gas insulated transmission line pipeline settlement simulation experiment method, which is characterized in that the method is executed by the three-phase common-tank gas insulated transmission line pipeline settlement simulation experiment device in the first aspect.

[0014] The hydraulic jack in the three-phase common-tank GIL pipeline settlement simulation experiment device is controlled to be loaded in stages according to a preset lifting height until a loading termination condition is met.

[0015] The displacement monitoring unit in the three-phase common-tank GIL settlement simulation experiment device is used for monitoring settlement displacement data of each first monitoring point on the three-phase common-tank GIL pipeline in real time.

[0016] The strain monitoring unit in the three-phase common-tank GIL settlement simulation experiment device is used for monitoring strain data of each second monitoring point on the three-phase common-tank GIL pipeline in real time.

[0017] The pressure monitoring unit in the three-phase common-tank GIL settlement simulation experiment device is used for monitoring pressure data in the three-phase common-tank GIL pipeline in real time.

[0018] The image acquisition unit in the three-phase common-tank GIL settlement simulation experiment device is used for capturing deformation image data of the three-phase common-tank GIL pipeline.

[0019] The settlement displacement data, the strain data, the pressure data and the deformation image data are analyzed to evaluate the structural bearing capacity of the three-phase common-tank GIL pipeline.

[0020] The embodiment of the present application provides a kind of three-phase common box gas insulated transmission line pipe settlement simulation experiment device and simulation experiment method, the device includes: basic pipeline module, set quantity's hydraulic jack, displacement monitoring unit, strain monitoring unit, pressure monitoring unit, image acquisition unit and data processing unit;The basic pipeline module includes steel structure support and three-phase common box gas insulated transmission line GIL pipe, the steel structure support is fixed with concrete foundation by bolt, the steel structure support is rigidly connected with the shell flange of three-phase common box GIL pipe by bolt;Three-phase common box GIL pipe is symmetrically installed with hydraulic jack in the midpoint below, and the hydraulic jack is used to lift three-phase common box GIL pipe according to set loading rate, until reaching loading termination condition;The displacement monitoring unit is arranged on the outer wall of three-phase common box GIL pipe, for real-time monitoring the settlement displacement data of each first monitoring point on three-phase common box GIL pipe;The strain monitoring unit is arranged on the outer wall of three-phase common box GIL pipe, for real-time monitoring the strain data of each second monitoring point on three-phase common box GIL pipe;The pressure monitoring unit is arranged in three-phase common box GIL pipe, for real-time monitoring the pressure data in three-phase common box GIL pipe;The image acquisition unit is used to capture the deformation image data of three-phase common box GIL pipe in the process of lifting three-phase common box GIL pipe by hydraulic jack;The data processing unit is used to receive the strain data, the settlement displacement data, the pressure data and the deformation image data, and analyzes the strain data, the settlement displacement data, the pressure data and the deformation image data, to evaluate the structural bearing capacity of three-phase common box GIL pipe.The above technical solution, through the synergistic effect of fixed end support and middle section hydraulic jack, can accurately simulate the extrusion deformation condition when the bottom of tunnel is unevenly lifted or the top is settled, support flexible adjustment of settlement mode under different geological conditions, solve the limitations of traditional device single-point loading.Integrated displacement monitoring unit, strain monitoring unit, pressure monitoring unit, image acquisition unit, etc., realize the dynamic capture of displacement, strain, pressure, deformation image and other multi-parameters in pipe settlement process.Furthermore, according to the parameters of dynamic capture, modeling, simulation and other processing are carried out, the influence of settlement on strain and sealing performance of three-phase common box GIL pipe is quantified, to realize the effective simulation of the influence of tunnel settlement on three-phase common box GIL pipe, provide scientific and quantitative basis for structural optimization design, safety operation threshold setting and whole life cycle operation and maintenance management of three-phase common box GIL pipe, improve the safety and economy of extra-high voltage transmission project.

[0021] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0023] Figure 1 A structure schematic diagram of a three-phase common tank gas insulated transmission line pipe settling simulation experiment device provided for the embodiment one of the present application is shown in the figure.

[0024] Figure 2 A flow schematic diagram of a three-phase common tank gas insulated transmission line pipe settling simulation experiment method provided for the embodiment two of the present application is shown in the figure. DETAILED DESCRIPTION

[0025] In order to make the person skilled in the art better understand the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should belong to the protection scope of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] Embodiment one

[0028] Figure 1 A three-phase common tank gas insulated transmission line pipe settling simulation experiment device provided for the embodiment one of the present application, which can be suitable for the case of settling simulation of three-phase common tank gas insulated transmission line pipe settling. The three-phase common tank gas insulated transmission line pipe settling simulation experiment device can be realized in the form of hardware and / or software.

[0029] As Figure 1As shown, the embodiment one provides a three-phase common box gas insulated transmission line pipe settlement simulation experiment device, which specifically can include: a basic pipe module 10, a set of hydraulic jacks 20, a displacement monitoring unit 30, a strain monitoring unit 40, a pressure monitoring unit 50, an image acquisition unit 60, and a data processing unit 70.

[0030] The basic pipe module 10 includes a steel structure support 11 and a three-phase common box gas insulated transmission line GIL pipe 12, the steel structure support 11 is fixed with the concrete foundation through bolts, and the steel structure support 11 is rigidly connected with the outer shell flange of the three-phase common box GIL pipe 12 through bolts.

[0031] The hydraulic jacks 20 are symmetrically installed at the midpoint below the three-phase common box GIL pipe 12, and are used to lift the three-phase common box GIL pipe 12 at a set loading rate until the loading termination condition is reached.

[0032] The displacement monitoring unit 30 is arranged on the outer wall of the three-phase common box GIL pipe 12, and is used to monitor the settlement displacement data of each first monitoring point on the three-phase common box GIL pipe 12 in real time.

[0033] The strain monitoring unit 40 is arranged on the outer wall of the three-phase common box GIL pipe 12, and is used to monitor the strain data of each second monitoring point on the three-phase common box GIL pipe 12 in real time.

[0034] The pressure monitoring unit 50 is arranged inside the three-phase common box GIL pipe 12, and is used to monitor the pressure data inside the three-phase common box GIL pipe 12 in real time.

[0035] The image acquisition unit 60 is used to capture the deformation image data of the three-phase common box GIL pipe 12 during the lifting of the three-phase common box GIL pipe 12 by the hydraulic jacks 20.

[0036] The data processing unit 70 is used to receive the strain data, the settlement displacement data, the pressure data, and the deformation image data, and analyze the strain data, the settlement displacement data, the pressure data, and the deformation image data to evaluate the structural bearing capacity of the three-phase common box GIL pipe.

[0037] It should be noted that the uneven settlement of the tunnel will have a significant impact on the sealing performance of the flange connection of the three-phase common box GIL pipe. In order to study the impact of settlement on the three-phase common box GIL pipe, the three-phase common box GIL pipe settlement simulation experiment device is used to study the impact of settlement on the three-phase common box GIL pipe, and the pipe structure bearing capacity is evaluated.

[0038] In the embodiment, the foundation pipeline module 10 comprises a steel structure support 11 and a three-phase common box gas insulated transmission line (GIL) pipeline 12. Preferably, a hot-rolled H-shaped steel structure support is adopted in the structural design, and the material is Q345B low-alloy high-strength steel with a yield strength of ≥345 MPa, which has plasticity, toughness and welding performance. The support is fixed to the concrete foundation through expansion bolts, and the horizontal error is controlled to be ≤1 mm / m. The thickness of the flange fixing device at both ends is optimized to be 30 mm through finite element analysis, and the surface is hot-dip galvanized for corrosion prevention. The device is rigidly connected to the outer shell flange of the three-phase common box GIL pipeline 12 through 8.8-grade high-strength bolts, and the pre-tightening force of a single bolt is 150-180 kN. The double-lane lock nut is reinforced to limit the axial displacement of the pipeline to ≤0.5 mm and the radial displacement to ≤0.3 mm. The design value of the counterforce at the fixed end reaches 250 kN, which meets the requirement of ≥200 kN.

[0039] Preferably, a certain number of hydraulic jacks can adopt 2 synchronous hydraulic jacks. 2 synchronous hydraulic jacks are symmetrically installed at the midpoint directly below the three-phase common box GIL pipeline 12, with a rated load of 50 t. A closed-loop servo control system is provided, and the loading rate and load synchronization error are ≤±0.5%. The displacement control accuracy is ±0.1 mm. Preferably, the top of the hydraulic jack is customized with an arc-shaped pressure plate, which is in close contact with the three-phase common box GIL pipeline. The arc-shaped pressure plate is reverse-modeled with the outer circle of the three-phase common box GIL pipeline 12 through three-dimensional scanning, with a close contact degree of ≥95%. The surface is treated with wear-resistant and anti-skid treatment or coated with silicon-based lubricating grease to avoid local stress concentration and ensure uniform load transmission.

[0040] The above technical solution can effectively disperse the load pressure, avoid local stress concentration, and ensure the consistency of the simulated working conditions and the actual engineering scene.

[0041] In the embodiment, the hydraulic jack 20 is used to lift the three-phase common box GIL pipeline 12 at a set loading rate until the loading termination condition is reached. The loading termination condition can be understood as the maximum bending angle of the three-phase common box GIL pipeline 12 reaching a set threshold, for example, the set threshold can be set to 1.5°. By setting the loading condition of the hydraulic jack, the uneven settlement of the soft soil foundation can be simulated. Different loading conditions can simulate different settlement modes, which can be set according to actual needs. For example, the settlement mode can be slow sinking at one end and stable at the other end. To achieve this effect, one hydraulic jack can be used to lift the three-phase common box GIL pipeline 12 at a set loading rate, and the other hydraulic jack can not be loaded, so that the three-phase common box GIL pipeline 12 is higher at one end than at the other end, indirectly simulating the scene of slow sinking at one end and stable at the other end.

[0042] After the steel structure support 11, the three-phase common box GIL pipeline and the hydraulic jack 20 are arranged, in the case of simulating the settlement scene, the displacement monitoring unit 30, the strain monitoring unit 40, the pressure monitoring unit 50 and the image acquisition unit 60 can be used to monitor the parameters in the settlement scene.

[0043] In the embodiment, the displacement monitoring unit 30 is arranged on the outer wall of the three-phase common box GIL pipeline 12, and the position is recorded as a first monitoring point. The displacement monitoring unit 30 is used to monitor the settlement displacement data of each first monitoring point on the three-phase common box GIL pipeline 12 in real time. The settlement displacement data can be understood as the displacement of the three-phase common box GIL pipeline in the vertical direction.

[0044] Preferably, the displacement monitoring unit 30 comprises a plurality of laser sensors, and the monitoring points are arranged on the outer wall of the three-phase common box GIL pipeline 12 as the first monitoring points. Each laser sensor is arranged at each first monitoring point to monitor the settlement displacement data of each first monitoring point.

[0045] In the embodiment, the monitoring points arranged on the outer wall of the three-phase common box GIL pipeline 12 are recorded as the first monitoring points. For example, the equal intervals can be 1 m, and one monitoring point is arranged every 1 m. One group of laser sensors is arranged every 1 m along the pipeline axis, for example, five groups of laser sensors are arranged to monitor the vertical displacement of the pipeline. In addition, the laser sensors monitor the maximum bending angle of the pipeline in real time. When the maximum bending angle reaches a set threshold value, for example, when the maximum bending angle of the pipeline reaches 1.5°, it is considered that the loading termination condition of the hydraulic jack is reached.

[0046] In the embodiment, the strain monitoring unit 40 is arranged on the outer wall of the three-phase common box GIL pipeline 12, and the position is recorded as a second monitoring point. The strain monitoring unit 40 is used to monitor the strain data of each second monitoring point on the three-phase common box GIL pipeline in real time.

[0047] Preferably, the strain monitoring unit 40 comprises a plurality of three-phase strain gauges and a static strain meter. The monitoring points are arranged on the outer wall of the three-phase common box GIL pipeline as the second monitoring points. Each three-phase strain gauge is pasted at each second monitoring point. The static strain meter senses the strain data of each second monitoring point through each three-phase strain gauge.

[0048] In the embodiment, the monitoring points on the outer wall of the three-phase common-tank GIL pipeline, which are arranged at equal intervals along the axial and circumferential directions, are referred to as second monitoring points. For example, 120-ohm three-way strain gauges are attached to the top, bottom and two side outer walls of the three-phase common-tank GIL pipeline, the accuracy of the three-phase strain gauges is ±1%, the points 20 cm away from the two sides of the jack action point and the flange weld are monitored, one group is arranged along the axial / circumferential direction every 10 cm to form a grid array, and the strain data are recorded in real time by the static strain gauge at a sampling frequency of 10 Hz.

[0049] In the embodiment, sulfur hexafluoride gas is filled in the three-phase common-tank GIL pipeline. The pressure monitoring unit 60 is arranged inside the three-phase common-tank GIL pipeline 12 to monitor the pressure data in the three-phase common-tank GIL pipeline 12 in real time. The pressure monitoring unit 60 includes at least one pressure sensor. For example, the pipeline is filled with 0.4 MPa SF6 gas, and a pressure sensor with an accuracy of ±0.05% full scale is installed.

[0050] Preferably, the device further comprises an alarm connected to the pressure monitoring unit 50, and the alarm is used to open the gas valve and generate an alarm prompt information when the pressure monitoring unit 50 monitors that the pressure drop rate in the three-phase common-tank GIL pipeline 12 exceeds the set rate.

[0051] In the embodiment, the set rate can be set according to the actual situation. The pressure sensor is linked with the alarm. When the pressure monitoring unit 50 monitors that the pressure drop rate in the three-phase common-tank GIL pipeline 12 exceeds the set rate, it indicates that the pipeline has a gas leak, and then the gas valve is opened and an alarm prompt information is generated to realize automatic unloading ventilation.

[0052] In the embodiment, the image acquisition unit 60 can use a high-speed camera. A black-and-white speckle field is prepared on the outer wall of the three-phase common-tank GIL pipeline 12. During the lifting of the three-phase common-tank GIL pipeline 12 by the hydraulic jack 20, the deformation image is acquired by a 100 frames / second high-speed camera, which is referred to as deformation image data.

[0053] It can be understood that by arranging the above monitoring units of various parameters, multi-source data can be synchronously acquired during the staged loading of the hydraulic jack 20. For example, the pipeline is loaded in stages according to the preset lifting height, and the pressure is maintained for 10 minutes after each stage of loading. After the data is stable, the displacement, strain, pressure and other parameters are acquired. The monitoring units such as the laser sensor, strain gauge, pressure sensor and high-speed camera are synchronously operated. For example, the sampling frequency can be set to be greater than or equal to 100 Hz to capture the transient response during the loading process and ensure that the time stamps of the multi-source data are consistent.

[0054] According to the above description, the data processing unit 70 receives the strain data, the settlement displacement data, the pressure data and the deformation image data, and analyzes the strain data, the settlement displacement data, the pressure data and the deformation image data, such as modeling and simulation, to evaluate the structural bearing capacity of the three-phase common tank GIL pipeline. For example, a pipeline-jack coupling model representing the settlement of the three-phase common tank GIL pipeline is established, and simulation is performed in combination with the deformation image data to generate a deformation animation during the settlement process of the three-phase common tank GIL pipeline. Alternatively, according to the strain data and the settlement displacement data, a strain-settlement displacement model representing the relationship between the strain and the settlement displacement of the three-phase common tank GIL pipeline is established to evaluate the mechanical properties of the three-phase common tank GIL pipeline. Alternatively, according to the pressure data and the settlement displacement data, a pressure-settlement displacement model representing the relationship between the pressure and the settlement displacement of the three-phase common tank GIL pipeline is established to evaluate the sealing performance of the three-phase common tank GIL pipeline. Alternatively, the deformation image data is processed using the digital image correlation technology (Digital Image Correlation, DIC) to draw a displacement distribution map and a strain distribution map of the surface of the three-phase common tank GIL pipeline; the displacement distribution map is verified based on the settlement displacement data, and the strain distribution map is verified based on the strain data.

[0055] The above technical solution can accurately simulate the extrusion deformation condition when the bottom of the tunnel is unevenly lifted or the top is settled, support flexible adjustment of the settlement mode under different geological conditions, and solve the limitations of single-point loading of traditional devices. The displacement monitoring unit, the strain monitoring unit, the pressure monitoring unit, the image acquisition unit, etc. are integrated to realize dynamic capture of multiple parameters such as displacement, strain, pressure, and deformation image during the pipeline settlement process. Further, modeling, simulation, etc. are performed according to the dynamically captured parameters to quantify the influence of settlement on the strain and sealing performance of the three-phase common tank GIL pipeline, to effectively simulate the influence of tunnel settlement on the three-phase common tank GIL pipeline, to provide scientific and quantitative basis for structural optimization design, safety operation threshold setting, and whole life cycle operation and maintenance management of the three-phase common tank GIL pipeline, and to improve the safety and economy of the ultra-high voltage power transmission project.

[0056] Embodiment Two

[0057] Figure 2 A flowchart of a three-phase common tank gas insulated transmission line pipeline settlement simulation experiment method provided by the embodiment two of the present application is shown. The method can be used for simulating the settlement of the three-phase common tank gas insulated transmission line pipeline. The method can be executed by a three-phase common tank gas insulated transmission line pipeline settlement simulation device, which can be realized in the form of hardware and / or software.

[0058] AsFigure 2 As shown, the second embodiment provides a settlement simulation method for settlement of a three-phase common tank gas insulated transmission line pipe, specifically comprising the following steps:

[0059] S201, control the hydraulic jack in the three-phase common tank GIL pipe settlement simulation experiment device to load according to the preset jacking height, until the loading termination condition is met.

[0060] It should be noted that the uneven settlement of the tunnel will have a significant impact on the sealing performance of the flange connection of the three-phase common tank GIL pipe. In order to study the influence of settlement on the three-phase common tank GIL pipe, the three-phase common tank GIL pipe settlement simulation experiment device is used to study the influence of settlement on the three-phase common tank GIL pipe, and the bearing capacity of the pipe structure is evaluated.

[0061] In this embodiment, the three-phase common tank gas insulated transmission line pipe settlement simulation experiment device comprises a foundation pipe module, a set of hydraulic jacks, a displacement monitoring unit, a strain monitoring unit, a pressure monitoring unit, an image acquisition unit and a data processing unit. The foundation pipe module comprises a steel structure support and a three-phase common tank gas insulated transmission line GIL pipe, the steel structure support is fixed to the concrete foundation by bolts, and the steel structure support is rigidly connected to the outer shell flange of the three-phase common tank GIL pipe by bolts. The hydraulic jacks are symmetrically installed at the midpoint directly below the three-phase common tank GIL pipe, and the hydraulic jacks are used to lift the three-phase common tank GIL pipe according to the set loading rate until the loading termination condition is reached.

[0062] In this embodiment, the loading termination condition can be understood as the maximum bending angle of the three-phase common tank GIL pipe reaching a set threshold, for example, the threshold can be set to 1.5°. By setting the loading condition of the hydraulic jack, the uneven settlement of the soft soil foundation can be simulated, and different loading conditions can simulate different settlement modes, which can be set according to actual needs. For example, the settlement mode can be slow sinking at one end and keeping stable at the other end. To achieve this effect, one hydraulic jack can lift the three-phase common tank GIL pipe according to the set loading rate, and the other hydraulic jack can not be loaded, so that the three-phase common tank GIL pipe is higher at one end than at the other end, thereby indirectly simulating the scene of slow sinking at one end and keeping stable at the other end. For example, by synchronously loading the hydraulic jacks at a rate of 0.5mm per stage, the pressure is maintained for 10 minutes after each stage of loading, simulating the stage-by-stage stable state in the actual settlement process.

[0063] The data processing unit collects and records the sensor data at a set sampling frequency, such as 100 Hz. Assuming that when loaded to the 5th level, a significant bend is observed in the middle of the pipeline, the laser displacement sensor shows that a significant vertical displacement occurs at this point, the strain data of the strain gauge shows that the stress concentration at the corresponding position is obvious, and higher strain values appear in some areas; the pressure data of the pressure sensor shows that the internal gas pressure of the pipeline decreases slightly, and the decrease rate is relatively slow.

[0064] S202, real-time monitoring of the settlement displacement data of each first monitoring point on the three-phase common tank GIL pipeline by the displacement monitoring unit in the three-phase common tank GIL settlement simulation experiment device.

[0065] As described above, during the loading process, the displacement monitoring unit in the three-phase common tank GIL settlement simulation experiment device captures the settlement displacement data of the three-phase common tank GIL pipeline. The displacement monitoring unit 30 is arranged on the outer wall of the three-phase common tank GIL pipeline, and the arranged position is recorded as the first monitoring point. The displacement monitoring unit is used to real-time monitor the settlement displacement data of each first monitoring point on the three-phase common tank GIL pipeline. The settlement displacement data can be understood as the vertical displacement of the three-phase common tank GIL pipeline. The displacement monitoring unit includes a plurality of laser sensors.

[0066] For example, the equal intervals can be 1 m, and a monitoring point is set every 1 m, recorded as the first monitoring point. One group of laser sensors is arranged every 1 m along the axial direction of the pipeline, for example, a total of 5 groups are arranged to monitor the vertical displacement of the pipeline. In addition, the laser sensor real-time monitors the maximum bending angle of the pipeline, and the maximum bending angle reaching a set threshold is taken as the loading termination condition. For example, when the maximum bending angle of the pipeline is monitored to be 1.5°, it is considered that the loading termination condition of the hydraulic jack is reached.

[0067] S203, real-time monitoring of the strain data of each second monitoring point on the three-phase common tank GIL pipeline by the strain monitoring unit in the three-phase common tank GIL settlement simulation experiment device.

[0068] In this embodiment, the strain monitoring unit is arranged on the outer wall of the three-phase common tank GIL pipeline, and the arranged position is recorded as the second monitoring point. The strain monitoring unit is used to real-time monitor the strain data of each second monitoring point on the three-phase common tank GIL pipeline. The strain monitoring unit includes a plurality of three-phase strain gauges and static strain gauges. For example, 120Ω three-dimensional strain gauges are pasted on the top, bottom and two side walls of the three-phase common tank GIL pipeline. The accuracy of the three-phase strain gauges is ±1%, and the range of 20 cm on both sides of the jack action point and the flange weld are monitored. One group is arranged every 10 cm along the axial direction / circumferential direction to form a grid array, and the strain data is recorded in real time by the static strain gauge at a sampling frequency of 10 Hz.

[0069] S204, monitoring the pressure data in the three-phase common tank GIL pipeline in real time through the pressure monitoring unit in the three-phase common tank GIL settlement simulation experiment device.

[0070] In this embodiment, sulfur hexafluoride gas is filled in the three-phase common tank GIL pipeline. The pressure monitoring unit is arranged inside the three-phase common tank GIL pipeline for real-time monitoring of the pressure data in the three-phase common tank GIL pipeline. The pressure monitoring unit includes at least one pressure sensor. For example, the inside of the pipeline is filled with 0.4 MPa SF6 gas, and a pressure sensor with an installation accuracy of ±0.05% full scale is installed.

[0071] S205, capturing the deformation image data of the three-phase common tank GIL pipeline through the image acquisition unit in the three-phase common tank GIL settlement simulation experiment device.

[0072] In this embodiment, the image acquisition unit can use a high-speed camera. During the loading process, the image acquisition unit in the three-phase common tank GIL settlement simulation experiment device captures the deformation image data of the three-phase common tank GIL pipeline. A black and white speckle field is prepared on the outer wall of the three-phase common tank GIL pipeline, and a 100 frame / s high-speed camera is used to collect the deformation image during the lifting of the three-phase common tank GIL pipeline by the hydraulic jack, which is recorded as the deformation image data.

[0073] S206, analyzing the settlement displacement data, the strain data, the pressure data, and the deformation image data through the data processing unit in the three-phase common tank GIL settlement simulation experiment device to evaluate the structural bearing capacity of the three-phase common tank GIL pipeline.

[0074] In this embodiment, by arranging the monitoring units of various parameters as described above, multi-source data synchronous acquisition can be realized during the staged loading of the hydraulic jack. Specifically, the loading is staged according to the preset lifting height, and the pressure is maintained for 10 minutes after each stage of loading. After the data is stable, the displacement, strain, pressure, and other parameters are collected. The monitoring units, such as laser sensors, strain gauges, pressure sensors, and high-speed cameras, are operated synchronously. For example, the sampling frequency can be set to ≥100 Hz to capture the transient response during the loading process and ensure that the timestamps of the multi-source data are consistent.

[0075] Preferably, the method further comprises: denoising, normalizing, and timestamp aligning the strain data, the settlement displacement data, and the pressure data to obtain processed strain data, settlement displacement data, and pressure data.

[0076] In this embodiment, the strain data, settlement displacement data and pressure data are processed by noise reduction, normalization and timestamp alignment to obtain processed strain data, settlement displacement data and pressure data. Through noise reduction processing, abnormal fluctuations caused by environmental interference are eliminated, ensuring the authenticity of the data. Through normalization processing and timestamp alignment processing, the multi-source data is comparable, facilitating comprehensive analysis.

[0077] According to the above description, the strain data, settlement displacement data, pressure data and deformation image data are received by the data processing unit, and the strain data, settlement displacement data, pressure data and deformation image data are analyzed, such as modeling and simulation, to evaluate the structural bearing capacity of the three-phase common tank GIL pipeline. For example, a pipeline-jack coupling model representing the settlement of the three-phase common tank GIL pipeline is established, and simulation is performed in combination with the deformation image data to generate a deformation animation during the settlement of the three-phase common tank GIL pipeline. Alternatively, according to the strain data and the settlement displacement data, a strain-settlement displacement model representing the relationship between the strain and the settlement displacement of the three-phase common tank GIL pipeline is established to evaluate the mechanical properties of the three-phase common tank GIL pipeline. Alternatively, according to the pressure data and the settlement displacement data, a pressure-settlement displacement model representing the relationship between the pressure and the settlement displacement of the three-phase common tank GIL pipeline is established to evaluate the sealing performance of the three-phase common tank GIL pipeline. Alternatively, the DIC technology processes the deformation image data to draw displacement distribution maps and strain distribution maps of the surface of the three-phase common tank GIL pipeline; the displacement distribution maps are verified based on the settlement displacement data, and the strain distribution maps are verified based on the strain data.

[0078] The above technical solution, through the cooperative action of the fixed end support and the middle section hydraulic jack, can accurately simulate the extrusion deformation condition when the bottom of the tunnel is unevenly lifted or the top is settled, support flexible adjustment of the settlement mode under different geological conditions, and solve the limitations of single-point loading of traditional devices. The displacement monitoring unit, strain monitoring unit, pressure monitoring unit, image acquisition unit, etc. are integrated to realize dynamic capture of multiple parameters such as displacement, strain, pressure and deformation image during pipeline settlement. Further, modeling, simulation and other processing are performed according to the dynamically captured parameters to quantify the influence of settlement on the strain and sealing performance of the three-phase common tank GIL pipeline, to effectively simulate the influence of tunnel settlement on the three-phase common tank GIL pipeline, and to provide scientific and quantitative basis for structural optimization design, safety operation threshold setting and whole life cycle operation and maintenance management of the three-phase common tank GIL pipeline, and to improve the safety and economy of the extra-high voltage power transmission project.

[0079] As a specific implementation, the step of analyzing the settlement displacement data, the strain data, the pressure data and the deformation image data to evaluate the structural bearing capacity of the three-phase common tank GIL pipeline can be optimized, including:

[0080] a1) a pipeline-jack coupling model representing the settlement of the three-phase common-tank GIL pipeline is established, and simulation is performed in combination with the deformation image data to generate a deformation animation in the settlement process of the three-phase common-tank GIL pipeline.

[0081] In this embodiment, a three-phase common-tank GIL pipeline model can be constructed in 1:1 size using modeling software, and components such as the shell, center conductor, epoxy insulator, etc. are presented in detail. Monitoring points are set in the stress concentration area and labeled with three-dimensional coordinates. Modeling is performed using modeling software to represent the pipeline-jack coupling model of the three-phase common-tank GIL pipeline settlement, input material parameters and boundary conditions, and use finite element analysis software to simulate in combination with deformation image data to generate a deformation animation of the three-phase common-tank GIL pipeline in the settlement process, which visually displays the entire process from the initial state to the final settlement state of the pipeline.

[0082] b1) According to the strain data and the settlement displacement data, a strain-settlement displacement model representing the relationship between the strain of the three-phase common-tank GIL pipeline and the settlement displacement is established to evaluate the mechanical properties of the three-phase common-tank GIL pipeline.

[0083] In this embodiment, according to the collected strain data and settlement displacement data, a strain-settlement displacement model representing the relationship between the strain of the three-phase common-tank GIL pipeline and the settlement displacement is established, such as drawing the axial and circumferential strain distribution curves of the three-phase common-tank GIL pipeline, analyzing the stress concentration area and deformation trend, and evaluating the mechanical properties of the three-phase common-tank GIL pipeline under uneven settlement. The accuracy of the experimental data can also be verified in combination with the finite element simulation results.

[0084] c1) According to the pressure data and the settlement displacement data, a pressure-settlement displacement model representing the relationship between the pressure of the three-phase common-tank GIL pipeline and the settlement displacement is established to evaluate the sealing performance of the three-phase common-tank GIL pipeline.

[0085] In this embodiment, the pressure data is used to analyze the internal gas pressure changes of the three-phase common-tank GIL pipeline and evaluate the sealing performance. Specifically, according to the pressure data and the settlement displacement data, a pressure-settlement displacement model representing the relationship between the pressure of the three-phase common-tank GIL pipeline and the settlement displacement is established to predict the risk of sealing failure of the pipeline under different settlement amounts. In addition, curves of settlement displacement versus time and pressure versus time can also be drawn, and different curves can be drawn using the collected data according to actual needs, which are not specifically limited here.

[0086] The above technical solutions use three-dimensional modeling, image data analysis and simulation to visually display the entire deformation process from the initial state to the settlement stability of the pipeline, generate strain displacement contour maps, pressure displacement contour maps and three-dimensional animations, and help analyze the strain concentration area and deformation law.

[0087] As an optional embodiment of the embodiment of the application, on the basis of the above embodiment, the method can be optimized to further include:

[0088] a2) processing the deformation image data using digital image technology to draw displacement distribution maps and strain distribution maps of the surface of the three-phase common tank GIL pipeline.

[0089] In this embodiment, DIC digital image correlation technology can be used to process the deformation image data to obtain full-field displacement and strain distribution, and draw displacement distribution maps and strain distribution maps of the surface of the three-phase common tank GIL pipeline. Combined with finite element simulation comparison, millimeter-level precision measurement of full-field displacement and strain is realized, and the influence of settlement on the mechanical strain and insulation performance of the GIL pipeline is quantified.

[0090] b2) verifying the displacement distribution maps based on the settlement displacement data, and verifying the strain distribution maps based on the strain data.

[0091] In this embodiment, the displacement distribution maps are verified based on the settlement displacement data, and the strain distribution maps are verified based on the strain data. A pipeline-jack coupling model is established based on modeling software, material parameters and boundary conditions are input, strain-displacement contour maps under different jacking heights are simulated, and the experimental data are compared and verified. A pipeline deformation three-dimensional dynamic animation is generated based on finite element analysis software, the measured data are compared with the finite element simulation contour maps, settlement rate, maximum displacement and other indicators are analyzed, and the structural bearing capacity is evaluated.

[0092] The above technical solution processes deformation images by DIC technology to obtain full-field displacement and strain distribution contour maps of the pipeline surface, and verifies the data detected by the monitoring unit, thereby realizing closed-loop verification of experimental data and simulation results.

[0093] As an optional embodiment of the embodiment of the application, on the basis of the above embodiment, the method can be optimized to further include:

[0094] When the pressure monitoring unit detects that the pressure drop rate in the three-phase common tank GIL pipeline exceeds the set rate, the gas unloading valve is opened and an alarm prompt information is generated.

[0095] In this embodiment, the set rate can be set according to actual conditions. The pressure sensor is linked with the alarm, and when the pressure monitoring unit 50 detects that the pressure drop rate in the three-phase common tank GIL pipeline 12 exceeds the set rate, it indicates that the pipeline is leaking, so the gas valve is opened and an alarm prompt information is generated to realize automatic unloading ventilation.

[0096] The technical solution increases the function of automatic unloading ventilation and alarming when the three-phase common-box GIL pipeline leaks, and realizes the processing measures for the risk of pipeline sealing failure caused by settlement.

[0097] In order to more clearly describe the three-phase common-box gas insulated transmission line pipeline settlement simulation experiment device and method provided by the embodiments of the present application, an actual application scenario is taken as an example for description. Specifically, a 10m long three-phase common-box GIL pipeline simulation section is selected, the pipe diameter is 1.2m, a Q345B low alloy H-shaped steel structure support is used, and the pipeline is rigidly connected with the pipeline through a 30mm thick hot-dip galvanized flange at both ends to ensure firm fixation. Two synchronous hydraulic jacks with a rated load of 50t are symmetrically arranged at the midpoint below the pipeline, the jacks use a servo control system, the displacement control accuracy is ±0.01mm, and the pressure fluctuation range is ≤±1%. A customized arc pressure bearing plate is installed at the top of the jack, the pressure bearing plate is made of 45 steel and is subjected to quenching treatment on the surface, and the hardness is HRC45-50. The outer surface of the GIL pipeline is measured and mapped through a three-dimensional laser scanning technology, the arc of the pressure bearing plate is reversely designed after the digital model is established, and the fit degree of the two is ensured to be more than 95%. A 5mm thick nitrile rubber buffer layer is laid on the contact surface of the pressure bearing plate and the pipeline, which can not only prevent local stress concentration, but also avoid wear caused by direct metal contact. A group of laser displacement sensors are arranged on the outer wall of the pipeline every 1m along the axial direction, a total of 9 groups; three-way strain gauges are pasted on the top, bottom and outer wall of the pipeline, and the strain gauges are densely arranged on both sides of the jack action point within a range of 20cm and at the flange weld, a total of 50 groups of strain gauges are pasted; the pipeline is filled with 0.4MPa SF6 gas, and a pressure sensor with an accuracy of ±0.05%FS is installed. All the sensors are connected to a data acquisition system and are calibrated and debugged to ensure accurate and reliable data. At the same time, matte white paint and matte black paint are alternately sprayed on the outer wall of the pipeline to form a random black and white speckle field with an average size of about 1.5mm×1.5mm, so as to ensure that the speckles are uniformly distributed and have good contrast. Two high-speed cameras with a frame rate of 100 frames / s are symmetrically arranged on both sides of the plane perpendicular to the axis of the pipeline, and are stably supported through a high-precision tripod to ensure stable shooting angles. The surface deformation field of the pipeline in the settlement process is monitored in real time at the sub-pixel level by using the DIC digital image correlation technology, and the displacement change of millimeter level or even micrometer level is captured.

[0098] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0099] The above detailed description does not limit the scope of the application. Various modifications, combinations, sub-combinations and alternatives can be made to the detailed description. Any modification, equivalent replacement and improvement etc. made within the spirit and principle of the application shall be included in the scope of the application.

Claims

1. A three-phase common-tank gas insulated transmission line pipe settling simulation experiment device, characterized by, The method comprises the following steps: The base pipeline module, a set of hydraulic jacks, a displacement monitoring unit, a strain monitoring unit, a pressure monitoring unit, an image acquisition unit, and a data processing unit are included. The base pipeline module comprises a steel structure support and a three-phase common box gas insulated transmission line (GIL) pipeline. The hydraulic jacks are symmetrically installed at the midpoint below the three-phase common box GIL pipeline and are used to lift the three-phase common box GIL pipeline at a set loading rate until the loading termination condition is reached. The displacement monitoring unit is arranged on the outer wall of the three-phase common box GIL pipeline and is used to monitor the settlement displacement data of each first monitoring point on the three-phase common box GIL pipeline in real time. The strain monitoring unit is arranged on the outer wall of the three-phase common box GIL pipeline and is used to monitor the strain data of each second monitoring point on the three-phase common box GIL pipeline in real time. The pressure monitoring unit is arranged inside the three-phase common box GIL pipeline and is used to monitor the pressure data in the three-phase common box GIL pipeline in real time. The image acquisition unit is used to capture the deformation image data of the three-phase common box GIL pipeline during the lifting of the three-phase common box GIL pipeline by the hydraulic jacks. The data processing unit is used to receive the strain data, the settlement displacement data, the pressure data, and the deformation image data and analyze the strain data, the settlement displacement data, the pressure data, and the deformation image data to evaluate the structural bearing capacity of the three-phase common box GIL pipeline.

2. The apparatus of claim 1, wherein, The displacement monitoring unit comprises a plurality of laser sensors. Monitoring points are arranged on the outer wall of the three-phase common box GIL pipeline as the first monitoring points, and each laser sensor is arranged at each first monitoring point to monitor the settlement displacement data of each first monitoring point.

3. The apparatus of claim 1, wherein, The strain monitoring unit comprises a plurality of three-phase strain gauges and a static strain meter. Monitoring points are arranged on the outer wall of the three-phase common box GIL pipeline as the second monitoring points, and each three-phase strain gauge is pasted at each second monitoring point. The static strain meter senses the strain data of each second monitoring point through each three-phase strain gauge.

4. The apparatus of claim 1, wherein, An arc-shaped pressure bearing plate is customized on the top of the hydraulic jack, and the arc-shaped pressure bearing plate is attached to the three-phase common box GIL pipeline.

5. The apparatus of claim 1, wherein, Further comprising: An alarm connected to the pressure monitoring unit. When the pressure monitoring unit monitors that the pressure drop rate in the three-phase common box GIL pipeline exceeds a set rate, the alarm opens a gas valve and generates an alarm prompt information.

6. A method for simulating the settlement of a three-phase common-enclosure gas-insulated transmission line pipeline, characterized in that, The method is performed by the three-phase common box gas insulated transmission line pipeline settlement simulation experiment device of any one of claims 1-5, and the method comprises the following steps: The hydraulic jacks in the three-phase common box GIL pipeline settlement simulation experiment device are controlled to be loaded in stages according to a preset lifting height until the loading termination condition is met. The displacement monitoring unit in the three-phase common tank GIL settlement simulation experiment device monitors the settlement displacement data of each first monitoring point on the three-phase common tank GIL pipeline in real time. The strain monitoring unit in the three-phase common tank GIL settlement simulation experiment device monitors the strain data of each second monitoring point on the three-phase common tank GIL pipeline in real time. The pressure monitoring unit in the three-phase common tank GIL settlement simulation experiment device monitors the pressure data in the three-phase common tank GIL pipeline in real time. The image acquisition unit in the three-phase common tank GIL settlement simulation experiment device captures the deformation image data of the three-phase common tank GIL pipeline. The settlement displacement data, strain data, pressure data, and deformation image data are analyzed to evaluate the structural bearing capacity of the three-phase common tank GIL pipeline.

7. The method of claim 6, wherein, The analysis of the settlement displacement data, strain data, pressure data, and deformation image data to evaluate the structural bearing capacity of the three-phase common tank GIL pipeline includes: A pipeline-jack coupling model representing the settlement of the three-phase common tank GIL pipeline is established, and simulation is performed in combination with the deformation image data to generate a deformation animation during the settlement process of the three-phase common tank GIL pipeline. According to the strain data and the settlement displacement data, a strain-settlement displacement model representing the relationship between strain and settlement displacement of the three-phase common tank GIL pipeline is established to evaluate the mechanical properties of the three-phase common tank GIL pipeline. According to the pressure data and the settlement displacement data, a pressure-settlement displacement model representing the relationship between pressure and settlement displacement of the three-phase common tank GIL pipeline is established to evaluate the sealing performance of the three-phase common tank GIL pipeline.

8. The method of claim 6, wherein, Further comprising: Using digital image technology to process the deformation image data, drawing the displacement distribution map and strain distribution map of the surface of the three-phase common tank GIL pipeline; Based on the settlement displacement data, the displacement distribution map is verified, and based on the strain data, the strain distribution map is verified.

9. The method of claim 6, wherein, Further comprising: The strain data, settlement displacement data, and pressure data are processed for noise reduction, normalization, and timestamp alignment to obtain processed strain data, settlement displacement data, and pressure data.

10. The method of claim 6, wherein, Further comprising: When the pressure monitoring unit detects that the pressure drop rate in the three-phase common tank GIL pipeline exceeds the set rate, the gas valve is unloaded and an alarm prompt message is generated.

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