Displacement measuring and adjusting method and system in moving process of large bridge structure

Abstract

The invention relates to the technical field of bridge construction measurement, and particularly discloses a displacement measurement and adjustment method and system in the moving process of a large bridge structure. Signals are transmitted and received through a millimeter wave measuring instrument, the precision is improved in combination with a corner reflector target, and then the signals are processed through a signal processing unit; and then the displacement calculation and regulation unit is used for calculating displacement, regulating and controlling movement, judging and processing according to displacement deviation, and repeating continuously until the bridge stably moves to a preset position. Based on a millimeter wave displacement measuring instrument, the technical problems that an existing displacement measuring instrument is high in cost, poor in portability, high in testing environment requirement, large in size and power consumption, limited in application range and the like are solved, the complete displacement measuring and adjusting method and system are provided, and continuous millimeter wave signals are generated and transmitted through the millimeter wave measuring instrument; and in combination with the corner reflector target, the electromagnetic echo signal intensity of the measuring point is enhanced, the signal-to-noise ratio is improved, the measuring precision of the measuring point displacement is effectively improved, and the interference of environmental factors on the measuring result is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction surveying, and particularly to a method and system for measuring and adjusting the displacement during the movement of a large bridge structure. Background Art

[0002] During the movement of a bridge structure, displacement measurement can effectively reflect the change in the position and attitude of the bridge, serve as the basis for bridge movement adjustment, and ensure the safety, reliability of the movement process, as well as the correctness of the final movement result. In the existing displacement measurement technologies, according to the test type, they can be divided into two categories: contact measurement and non-contact measurement. Among them, contact measurement mainly uses strain gauges and is widely applied. However, it often requires a large number of strain gauges to be arranged, and is easily affected by the environment, resulting in the failure of some strain gauges. Non-contact measurement has obvious advantages in terms of installation simplicity, test process stability, etc., such as machine vision, laser Doppler vibrometer, etc.

[0003] However, for the existing displacement measurement methods, the contact type has cumbersome installation and poor environmental adaptability. The non-contact laser Doppler vibrometer is large in volume and power consumption, expensive in cost, and has high requirements for the measurement environment. The machine vision method is also easily affected by environmental light.

[0004] Therefore, there is an urgent need for a method and system for measuring and adjusting the displacement during the movement of a large bridge structure to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a displacement measurement and adjustment system for a large bridge structure during movement, including: a millimeter-wave measurement module, an auxiliary support and adjustment module, and a data processing and control module. Among them, the millimeter-wave measurement module includes a millimeter-wave measuring instrument and a corner reflector target, the auxiliary support and adjustment module includes a bearing pile, a jack, and a slide rail, and the data processing and control module includes a signal processing unit and a displacement calculation and regulation unit;

[0006] The millimeter-wave measuring instrument is used to generate and transmit a continuous millimeter-wave signal, receive the electromagnetic echo scattered by the target, obtain a zero-intermediate-frequency baseband signal, and calculate the displacement between the target and the measuring instrument using this signal;

[0007] The corner reflector target is arranged at the measuring point to enhance the intensity of the electromagnetic echo signal at the measuring point;

[0008] The signal processing unit is connected to the millimeter-wave measuring instrument and is used to process the signal received by the millimeter-wave measuring instrument to obtain processed signal data;

[0009] The displacement calculation and regulation unit is connected to the signal processing unit and is used to calculate the actual displacement change information of the bridge structure according to the processed signal data, and regulate the bridge movement process based on the displacement information.

[0010] If the displacement deviation is within the preset safe range, continue to move normally; if it exceeds the safe range, judge the degree of exceeding. If the degree of exceeding is small, make fine adjustments and record the deviation information. If the degree of exceeding is large, trigger an alarm and suspend the movement. Repeat the above steps until the bridge is smoothly moved to the preset position of the pier.

[0011] Furthermore, the load-bearing piles are pre-arranged on the bridge movement path and positioned and fastened, which are used to lift the height of the bridge structure and act as the load-bearing for the jacks and sliding rails. The jacks are installed between the load-bearing piles and the sliding rails, and the tilt angle of the sliding rails is controlled by adjusting their height, which is used to move and adjust the bridge structure. The sliding rails are installed between the jacks and the bridge structure, enabling the bridge structure to slide on them to achieve the control and adjustment of the bridge displacement and attitude.

[0012] Furthermore, the millimeter-wave measuring instrument is used to generate and transmit continuous millimeter-wave signals, and the formula for its transmitted signal is:

[0013] ;

[0014] Where, is the signal amplitude; is the starting frequency of the signal, and k refers to the slope of frequency increase; refers to the initial phase;

[0015] Then the echo signal received by the millimeter-wave measuring instrument can be expressed as:

[0016] ;

[0017] Where, is the received signal amplitude, is the time difference for the signal to be reflected back to the radar, and , is the distance between the millimeter-wave measuring instrument and the measured object when the measured object is stationary, is the vibration time series of the measured object.

[0018] Furthermore, the steps of calculating the actual displacement change information of the bridge structure according to the processed signal data include:

[0019] Mix the transmitted signal and the received signal to obtain a high-frequency signal and a low-frequency signal;

[0020] The calculation formula for the zero-intermediate-frequency baseband signal is:

[0021] ;

[0022] In the above formula, is a zero - IF baseband signal, exp represents the natural exponential function, j represents the imaginary unit in complex number operations, and t is the time variable. is the wavelength corresponding to the highest frequency of the frequency sweep. is the wavelength corresponding to the starting frequency of the signal. represents the vibration time series of the object under test at time ;

[0023] Thus, the target vibration time series can be calculated through phase - difference transformation:

[0024] ;

[0025] Then,

[0026] ;

[0027] By combining the distance information and the vibration information, the actual displacement change information of the object under test can be obtained.

[0028] Furthermore, when regulating the movement process of the bridge according to the displacement information, the formula used is:

[0029] ;

[0030] Where, is the displacement change of the object under test within time T, is the phase change of the signal measured by the measuring instrument, is the wavelength corresponding to the starting frequency of the signal, and the real - time displacement change information can be obtained from this.

[0031] Furthermore, assuming that the safety range is , when , the bridge continues to move normally;

[0032] When or and or ( is the preset smaller deviation threshold), it is considered that the exceeding degree is small, and fine - tuning is performed and the deviation information is recorded;

[0033] When or and or , it is considered that the exceeding degree is large, an alarm is triggered and the movement is paused for further processing.

[0034] The present invention also discloses a method for displacement measurement and adjustment during the movement of a large - scale bridge structure, including the following steps:

[0035] A continuous millimeter-wave signal is transmitted by a millimeter-wave measuring instrument, and the electromagnetic echo scattered by the target is received to obtain a zero-intermediate-frequency baseband signal, and the displacement between the target and the measuring instrument is calculated using this signal;

[0036] The electromagnetic echo signal intensity of the measuring point is enhanced by a corner reflector target to improve the signal-to-noise ratio and the measurement accuracy of the displacement of the measuring point;

[0037] The signal received by the millimeter-wave measuring instrument is processed by the signal processing unit to obtain processed signal data;

[0038] The actual displacement change information of the bridge structure is calculated by the displacement calculation and regulation unit according to the processed signal data, and the movement process of the bridge is regulated based on the displacement information;

[0039] If the displacement deviation is within the preset safe range, continue to move normally; if it exceeds the safe range, judge the degree of exceeding. If the degree of exceeding is small, make fine adjustments and record the deviation information. If the degree of exceeding is large, trigger an alarm and suspend the movement. Repeat the above steps until the bridge is smoothly moved to the preset position of the bridge pier.

[0040] This application also provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the above method are implemented.

[0041] This application also provides a computer-readable storage medium, on which a computer program is stored. It is characterized in that when the computer program is executed by a processor, the steps of the above method are implemented.

[0042] The beneficial effects of this application are as follows:

[0043] Based on a millimeter-wave displacement measuring instrument, this invention solves the technical problems of high cost, poor portability, high requirements for the test environment, large volume and power consumption, and limited application range of existing displacement measuring instruments, and proposes a complete, efficient, and high-precision method and system for measuring and adjusting the displacement during the movement of a large bridge structure. And by generating and transmitting a continuous millimeter-wave signal by the millimeter-wave measuring instrument, combined with a corner reflector target to enhance the electromagnetic echo signal intensity of the measuring point and improve the signal-to-noise ratio. Compared with traditional methods, it can more accurately measure the displacement between the target and the measuring instrument in a complex environment, effectively improving the measurement accuracy of the displacement of the measuring point and reducing the interference of environmental factors on the measurement results. Description of the Drawings

[0044] Figure 1 It is a schematic flowchart of the method proposed in an embodiment of this application.

[0045] Figure 2 It is a schematic diagram of the bridge movement process provided by an embodiment of this invention.

[0046] Figure 3 Schematic diagram of the displacement measurement method provided by an embodiment of the present invention.

[0047] Figure 4 Framework diagram of the displacement measurement and adjustment method provided by an embodiment of the present invention.

[0048] The realization of the purpose of this application, functional features and advantages will be further described in conjunction with embodiments with reference to the accompanying drawings. Specific embodiments

[0049] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] Embodiment 1

[0051] This application provides a displacement measurement and adjustment system for the movement process of a large bridge structure, including: a millimeter-wave measurement module, an auxiliary support and adjustment module, and a data processing and control module. Among them, the millimeter-wave measurement module includes a millimeter-wave measuring instrument and a corner reflector target, the auxiliary support and adjustment module includes a bearing pile, a jack, and a slide rail, and the data processing and control module includes a signal processing unit and a displacement calculation and regulation unit;

[0052] The millimeter-wave measuring instrument is used to generate and transmit a continuous millimeter-wave signal, receive the electromagnetic echo scattered by the target, obtain a zero-intermediate-frequency baseband signal, and calculate the displacement between the target and the measuring instrument using this signal;

[0053] The corner reflector target is arranged at the measuring point, used to enhance the electromagnetic echo signal intensity of the measuring point, improve the signal-to-noise ratio, and improve the measurement accuracy of the displacement of the measuring point;

[0054] The signal processing unit is connected to the millimeter-wave measuring instrument and is used to process the signal received by the millimeter-wave measuring instrument, including mixing the transmitted signal and the received signal, outputting a zero-intermediate-frequency baseband signal through a low-pass filter, and obtaining processed signal data;

[0055] The displacement calculation and regulation unit is connected to the signal processing unit and is used to calculate the actual displacement change information of the bridge structure according to the processed signal data, and regulate the bridge movement process based on the displacement information;

[0056] If the displacement deviation is within the preset safety range, continue to move normally; if it exceeds the safety range, judge the degree of exceeding. If the degree of exceeding is small, make fine adjustments and record the deviation information. If the degree of exceeding is large, trigger an alarm and suspend the movement. Repeat the above steps until the bridge is smoothly moved to the preset position of the pier.

[0057] Based on a millimeter-wave displacement measuring instrument, the present invention solves the technical problems of high cost, poor portability, high requirements for the test environment, large volume and power consumption, and limited application range of existing displacement measuring instruments, and proposes a complete, efficient, and high-precision method and system for measuring and adjusting the displacement during the movement of large bridge structures.

[0058] In the present invention, a continuous millimeter-wave signal is generated and emitted by a millimeter-wave measuring instrument, and a corner reflector target is combined to enhance the electromagnetic echo signal intensity of the measuring point and improve the signal-to-noise ratio. Compared with traditional methods, it can measure the displacement between the target and the measuring instrument more accurately in complex environments, effectively improving the measurement accuracy of the displacement of the measuring point and reducing the interference of environmental factors on the measurement results.

[0059] Compared with the strain gauges of traditional contact measurement, which are easily damaged and affect reliability, the millimeter-wave measurement module and its components in the present invention are relatively stable and are not significantly affected by environmental factors such as wind and rain erosion, temperature and humidity changes, ensuring the stability of the measurement system during the movement of the bridge and enabling continuous and reliable acquisition of displacement data.

[0060] The installation of traditional laser Doppler vibrometers is complex and requires professional operation and maintenance. In the system of the present invention, the functions of each module are clear. The setting of the bearing piles, jacks, and slide rails of the auxiliary support and adjustment module makes the support and adjustment operations during the movement of the bridge relatively simple, reducing the dependence on professional operators and the operation difficulty.

[0061] Existing machine vision methods cannot accurately obtain displacement information in complex or insufficient light conditions. The millimeter-wave measurement of the present invention is based on the principle of electromagnetic waves and is not limited by light conditions. It can work normally in various lighting environments, has stronger environmental adaptability, and can meet the displacement measurement requirements under different environmental conditions during the movement of large bridge structures. The data processing and control module of the present invention can regulate the movement process of the bridge according to the displacement information, automatically judge and take corresponding measures such as fine adjustment and alarm when the displacement deviation exceeds the safe range. Compared with traditional measurement methods, it adds an intelligent regulation function, better ensuring the smooth movement of the bridge to the preset position and improving the safety and controllability of the bridge movement process.

[0062] Specifically, the bearing piles are pre-arranged on the bridge movement path and positioned and fastened, used for lifting the height of the bridge structure and serving as the load-bearing for the jacks and slide rails. The jacks are installed between the bearing piles and the slide rails, and the tilt angle of the slide rails is controlled by adjusting their height, used for moving and adjusting the bridge structure. The slide rails are installed between the jacks and the bridge structure, enabling the bridge structure to slide on them to achieve the control and adjustment of the bridge displacement and attitude.

[0063] Specifically, the millimeter-wave measuring instrument is used to generate and transmit a continuous millimeter-wave signal, and the formula for its transmitted signal is:

[0064] ;

[0065] where, is the signal amplitude; is the starting frequency of the signal, and k refers to the slope of frequency increase; refers to the initial phase;

[0066] Then the echo signal received by the millimeter-wave measuring instrument can be expressed as:

[0067] ;

[0068] where, is the received signal amplitude, is the time difference for the signal to be reflected back to the radar, and , is the distance between the millimeter-wave measuring instrument and the object to be measured when the object is stationary, is the vibration time series of the object to be measured.

[0069] Specifically, the steps of calculating the actual displacement change information of the bridge structure according to the processed signal data include:

[0070] Mix the transmitted signal and the received signal to obtain a high-frequency signal and a low-frequency signal;

[0071] Output a zero-intermediate-frequency baseband signal through a low-pass filter. The specific formula derivation of the baseband signal is as follows:

[0072] ,

[0073] Then,

[0074] ;

[0075] Since has a small value, so can be ignored, and further derivation gives

[0076] ;

[0077] Then,

[0078] ;

[0079] Since the duration of one sweep period is short, the formula is used as the highest sweep frequency. At the same time, assuming that the target position is a definite value within one sweep period, that is , then the above formula can be further transformed into:

[0080] ;

[0081] Then,

[0082] ;

[0083] In the above formula, is the zero - intermediate - frequency baseband signal, exp represents the natural exponential function, j represents the imaginary unit in complex number operations, t is the time variable, , is the wavelength corresponding to the highest frequency of the frequency sweep, is the wavelength corresponding to the starting frequency of the signal, represents the vibration time series of the object to be measured at time ;

[0084] Thus, the target vibration time series can be calculated through phase - difference transformation:

[0085] ;

[0086] Then,

[0087] ;

[0088] By combining the distance information and the vibration information, the actual displacement change information of the object to be measured can be obtained.

[0089] Furthermore, when regulating the moving process of the bridge according to the displacement information, the formula used is:

[0090] ;

[0091] Among them, is the displacement change amount of the object to be measured within time T, is the phase change amount of the signal measured by the measuring instrument, is the wavelength corresponding to the starting frequency of the signal, is the actual distance between the object to be measured and the measuring instrument when the object is stationary, is the signal time difference received by the measuring instrument, c is the speed of light in vacuum, x(t) is the vibration time series of the object to be measured, is the phase change time series of the signal measured by the measuring instrument, and thus the real - time displacement change information can be obtained.

[0092] It should be noted that for the displacement measurement and adjustment of the moving process of large - scale bridge structures, it can be divided into the following steps,

[0093] Step 1, such as Figure 2As shown in the figure, first, arrange the bridge moving scenario. Among them, the bearing piles are pre-arranged on the bridge moving path and positioned and fastened. On the one hand, it plays a role in lifting the height of the bridge structure, and on the other hand, it serves as the load-bearing for the jacks and sliding rails. The jacks are installed between the bearing piles and the sliding rails, and the inclination angle of the sliding rails is controlled by adjusting the height of the jacks, so as to move and adjust the bridge structure. The sliding rails are installed between the jacks and the bridge structure, and the bridge structure can slide on the sliding rails to achieve the effect of controlling and adjusting the bridge displacement and attitude.

[0094] Step 2, arrange the millimeter-wave measuring instrument and the measuring point targets, as Figure 3 shown in the figure. First, arrange the measuring point targets on the front of the bridge. The measuring instrument 1 emits millimeter-wave signals directly at the targets and receives the echo signals. After digital signal processing, the zero-IF baseband signals are obtained, and the displacement of the bridge in the horizontal direction can be calculated in real time. Secondly, arrange the measuring point targets on the side of the bridge and on the jacks. The measuring instrument 2 emits millimeter-wave signals over a large range of the entire side to obtain the real-time displacement information of each measuring point.

[0095] Step 3, real-time displacement measurement. The measuring instrument 1 realizes the real-time monitoring of the horizontal displacement of the bridge by measuring the measuring point targets on the front of the bridge, and the measuring instrument 2 realizes the real-time monitoring of the displacement of the measuring points on the side of the bridge and the surface of the jacks. It can realize the measurement of the overall displacement of the bridge and the calculation of the vibration information and height information of the jacks, which is used as the pre-information judgment for subsequent displacement adjustment. The displacement measurement method combines the actual object distance information with the vibration information and uses the formula:

[0096] ;

[0097] In the formula, is the actual distance between the measured object and the measuring instrument when it is stationary, is the time difference of the signals received by the measuring instrument, c is the speed of light in vacuum, is the vibration time series of the measured object, is the phase change time series of the signals measured by the measuring instrument, and the real-time displacement change information can be obtained from this.

[0098] Step 4, real-time displacement adjustment method and system. Through the displacement monitoring information of the bridge and the jacks and the horizontal displacement trajectory of the bridge, the height of the jacks can be adjusted to control the bridge to move slowly and correctly along the predetermined route at a constant speed. If the bridge attitude deviates during the bridge movement, or there are unexpected conditions such as the vibration of the jacks and the wrong height adjustment, the millimeter-wave measuring instrument system can conduct real-time monitoring and alarm, and the movement direction and displacement of the bridge can be adjusted by means of human intervention. Finally, when the bridge moves smoothly to the pier and the displacements of each measuring point reach the expected values, the bridge movement ends, thus completing the displacement measurement and adjustment during the movement process of the large bridge structure.

[0099] As Figure 1 shown, the present invention also discloses a method for measuring and adjusting the displacement during the movement of a large bridge structure, including the following steps:

[0100] S1, emitting continuous millimeter-wave signals through a millimeter-wave measuring instrument, receiving the electromagnetic echo scattered by the target, obtaining a zero-intermediate-frequency baseband signal, and calculating the displacement between the target and the measuring instrument using this signal;

[0101] S2, enhancing the intensity of the electromagnetic echo signal at the measuring point through a corner reflector target, improving the signal-to-noise ratio, and enhancing the measurement accuracy of the displacement at the measuring point;

[0102] S3, processing the signal received by the millimeter-wave measuring instrument through the signal processing unit to obtain processed signal data;

[0103] S4, using the displacement calculation and regulation unit to calculate the actual displacement change information of the bridge structure according to the processed signal data, and regulating the movement process of the bridge based on the displacement information;

[0104] S5, if the displacement deviation is within the preset safe range, continue to move normally; if it exceeds the safe range, judge the degree of exceeding. If the degree of exceeding is small, make fine adjustments and record the deviation information. If the degree of exceeding is large, trigger an alarm and suspend the movement, and repeat the above steps until the bridge is smoothly moved to the preset position of the bridge pier.

[0105] The present application also provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the above method are implemented.

[0106] The present application also provides a computer-readable storage medium, on which a computer program is stored. The computer program is characterized in that when it is executed by a processor, the steps of the above method are implemented.

[0107] Embodiment 2

[0108] The difference between this embodiment and Embodiment 1 is that assuming the safe range is , when , the bridge continues to move normally;

[0109] When or and or ( is the preset small deviation threshold), it is considered that the degree of exceeding is small, and fine adjustments are made and the deviation information is recorded;

[0110] When or and or If so, it is considered that the exceeding degree is relatively large, an alarm is triggered and the movement is paused to wait for further processing.

[0111] This embodiment clearly defines the displacement range of the normal movement of the bridge. When the displacement deviation is within the safe range ( ), the bridge can continue to move normally, avoiding unnecessary interference and ensuring the construction efficiency. Suppose in the translation project of a large bridge, a = -5 mm and b = 5 mm. If the displacement change amount in a certain direction of the bridge is monitored in real time to be 3 mm, which is within the safe range. At this time, the bridge can continue to move according to the original plan without being disturbed during the construction process.

[0112] For the situation where the safe range is exceeded but the degree is small, fine-tuning is carried out and the deviation information is recorded. This can not only correct small displacement deviations in a timely manner, but also will not have a great impact on the overall construction progress. At the same time, recording the information is convenient for subsequent analysis and summary. For example, in the above bridge translation project construction, if mm, when it is monitored that mm, mm , that is, the exceeding degree is small. At this time, the system will fine-tune the movement of the bridge, such as adjusting the height of the jack or the angle of the slide rail, to make its displacement return to the safe range, and at the same time record the deviation information this time to provide reference for subsequent similar situations.

[0113] When the displacement exceeding degree is large, an alarm is triggered and the movement is paused, which can timely detect potential serious safety problems and avoid serious consequences such as damage to the bridge structure caused by excessive displacement deviation. Waiting for further processing can ensure that the problem is properly solved. If it is monitored during the construction process that mm, mm , the exceeding degree is large. At this time, the system immediately triggers an alarm, and the staff at the construction site will receive an alarm notice. At the same time, the bridge movement is paused, and the engineer will conduct a comprehensive inspection and evaluation of the bridge state, analyze the reason for the excessive displacement deviation, and formulate a solution to ensure the safety of the bridge movement process.

[0114] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, value library, or other medium provided in this application and used in the embodiments can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0115] It should be noted that in this article, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, apparatus, article, or method including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, apparatus, article, or method including that element.

[0116] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent results or equivalent process transformations made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present invention.

Claims

1. A displacement measurement and adjustment system for the movement of a large bridge structure, characterized in that: include: A millimeter wave measurement module, an auxiliary support and adjustment module, and a data processing and control module, wherein the millimeter wave measurement module includes a millimeter wave measuring instrument and a corner reflector target, the auxiliary support and adjustment module includes a load-bearing pile, a jack, and a slide rail, and the data processing and control module includes a signal processing unit and a displacement calculation and control unit; The millimeter wave measuring instrument is used to generate and transmit continuous millimeter wave signals, and receive electromagnetic echoes scattered by the target to obtain a zero intermediate frequency baseband signal, and use the signal to calculate the displacement between the target and the measuring instrument; The corner reflector target is arranged at the measuring point to enhance the electromagnetic echo signal strength of the measuring point; The signal processing unit is connected to the millimeter wave measuring instrument and is used to process the signal received by the millimeter wave measuring instrument to obtain processed signal data; The displacement calculation and control unit is connected to the signal processing unit, and is used to calculate the actual displacement change information of the bridge structure according to the processed signal data, and to control the movement process of the bridge according to the displacement information; If the displacement deviation is within the preset safety range, normal movement will continue; if it exceeds the safety range, the degree of excess will be determined. If the degree of excess is small, fine-tuning will be performed and the deviation information will be recorded. If the degree of excess is large, an alarm will be triggered and the movement will be suspended. Repeat the above steps until the bridge is smoothly moved to the preset position of the pier.

2. The displacement measurement and adjustment system for a large bridge structure during movement according to claim 1 is characterized in that: The load-bearing piles are pre-arranged on the movement path of the bridge and are positioned and fastened. They are used to raise the height of the bridge structure and serve as load-bearing for the jack and the slide rail. The jack is installed between the load-bearing piles and the slide rail. The inclination angle of the slide rail is controlled by adjusting its height, and is used to move and adjust the bridge structure. The slide rail is installed between the jack and the bridge structure, so that the bridge structure can slide on it, thereby achieving control and adjustment of the displacement and posture of the bridge.

3. The displacement measurement and adjustment system for a large bridge structure during movement according to claim 1 is characterized in that: The millimeter wave measuring instrument is used to generate and transmit a continuous millimeter wave signal, and the formula of the transmitted signal is: ; in, is the signal amplitude; is the signal starting frequency, Refers to the slope of frequency growth; Refers to the initial phase; Then the echo signal received by the millimeter wave measuring instrument can be expressed as: ; in, is the received signal amplitude, exp represents the natural exponential function, j represents the imaginary unit in complex number operations, is the time difference for the signal to be reflected back to the radar, and , is the distance between the measured object and the millimeter wave measuring instrument when it is stationary, is the vibration time series of the object being measured.

4. The displacement measurement and adjustment system for a large bridge structure during movement according to claim 1 is characterized in that: The step of calculating the actual displacement change information of the bridge structure according to the processed signal data comprises: Mixing the transmitted signal and the received signal to obtain a high-frequency signal and a low-frequency signal; The calculation formula for the zero-IF baseband signal is: ; In the above formula, is a zero intermediate frequency baseband signal, exp represents a natural exponential function, j represents an imaginary unit in complex number operations, t is a time variable, , is the wavelength corresponding to the highest frequency of the sweep, is the wavelength corresponding to the starting frequency of the signal, Represents the object being measured at time The vibration time series at ; The target vibration time series can be calculated by phase difference transformation: ; but, ; By combining the distance information with the vibration information, the actual displacement change information of the measured object can be obtained.

5. The displacement measurement and adjustment system for the movement process of a large bridge structure according to claim 4 is characterized in that: The formula used to control the bridge movement process according to the displacement information is: ; in, is the displacement change of the measured object within the time T, is the phase change of the signal measured by the measuring instrument, is the wavelength corresponding to the signal starting frequency, from which the real-time displacement change information can be obtained.

6. The displacement measurement and adjustment system for the movement of a large bridge structure according to claim 5, characterized in that: Assume that the safety margin is ,when , the bridge continues to move normally; when or and or ( is the preset smaller deviation threshold), the degree of excess is considered small, and fine-tuning is performed and the deviation information is recorded; when or and or When the limit is exceeded, it is considered to be too large, an alarm is triggered, and movement is suspended pending further processing.

7. A method for measuring and adjusting displacement during the movement of a large bridge structure, characterized in that: The following steps are involved: The millimeter wave measuring instrument transmits a continuous millimeter wave signal and receives the electromagnetic echo scattered by the target to obtain a zero intermediate frequency baseband signal, and uses the signal to calculate the displacement between the target and the measuring instrument; The electromagnetic echo signal strength of the measuring point is enhanced through the corner reflector target, the signal-to-noise ratio is improved, and the measurement accuracy of the measuring point displacement is improved; Processing the signal received by the millimeter wave measuring instrument by the signal processing unit to obtain processed signal data; The displacement calculation and control unit is used to calculate the actual displacement change information of the bridge structure according to the processed signal data, and the movement process of the bridge is controlled according to the displacement information; If the displacement deviation is within the preset safety range, continue to move normally; If it exceeds the safety range, the degree of excess is determined. If the degree of excess is small, fine-tuning is performed and the deviation information is recorded. If the degree of excess is large, an alarm is triggered and the movement is suspended. The above steps are repeated until the bridge is smoothly moved to the preset position of the pier.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for displacement measurement and adjustment during the movement of a large bridge structure described in claim 7 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for displacement measurement and adjustment during the movement of a large bridge structure described in claim 7 are implemented.

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