Method, device and system for measuring mid-span elevation of reference cable of suspension bridge under wind-induced vibration environment

Abstract

The present application provides a method, device, and system for measuring the mid-span elevation of a suspension bridge reference cable under a wind-induced vibration environment. The method comprises: using a damped single prism to observe and obtain the differential elevation of the first span of the reference cable and the differential elevation of the second span of the reference cable; fitting and obtaining a reference value for the mid-span elevation of the reference cable based on the obtained differential elevation of the first span of the reference cable and the differential elevation of the second span of the reference cable; using a damped double prism to observe and obtain a measured value for the mid-span elevation of the reference cable; comparing the difference between the measured value for the mid-span elevation of the reference cable and the reference value for the mid-span elevation of the reference cable with a preset deviation value to obtain a comparison condition; and when the difference between the measured value for the mid-span elevation of the reference cable and the reference value for the mid-span elevation of the reference cable is less than the preset deviation value, determining that the measured value for the mid-span elevation of the reference cable is the mid-span elevation of the reference cable. The method for measuring the mid-span elevation of a suspension bridge reference cable under a wind-induced vibration environment provided by the present application has low measurement error and high reliability, thereby ensuring the measurement quality of the mid-span elevation of the reference cable in a wind-induced vibration environment.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction measurement, and in particular to a method for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment. Background Art

[0002] Cables are the key load-bearing structures of suspension bridges, and the reference cables serve as the benchmark for cable installation and measurement. Reference cables can be hundreds or even thousands of meters long, and their mid-span elevation or sag is susceptible to deformation due to atmospheric temperature fluctuations. Therefore, mid-span elevation measurements must be performed at night when there is no wind or a breeze of less than level 3, no sunlight, and minimal temperature fluctuations. However, suspension bridges located in the ocean or in deep canyons and mountainous areas often experience strong winds of level 3 to 6 during these dark, low-temperature nights, causing vibration in the reference cables and presenting significant challenges.

[0003] The mid-span elevation measurement of a datum cable is typically performed using the distance-based triangulation differential elevation method. Two symmetrical prisms or a quadrangular prism fixture is installed at the mid-span of the datum cable. A total station is used to perform distance-based triangulation on the prism fixture, ensuring the prisms are not affected by wind vibration. This method provides the mid-span elevation of the datum cable. However, in wind-driven environments, the prisms vibrate repeatedly, making distance-based triangulation impossible or resulting in significant uncertainty, failing to meet the tolerance requirements for datum cable elevation measurement. This method urgently needs improvement. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned background technology and to provide a method, device and system for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment.

[0005] In a first aspect, the present application provides a method for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment, characterized by comprising the following steps:

[0006] The damped single prism is used to obtain the differential elevation of the first span of the reference cable and the differential elevation of the second span of the reference cable;

[0007] According to the obtained differential elevation of the first span of the benchmark cable and the differential elevation of the second span of the benchmark cable, the reference value of the mid-span elevation of the benchmark cable is obtained by fitting;

[0008] Damped biprism observation is used to obtain the measured value of the mid-span elevation of the benchmark cable;

[0009] Compare the difference between the measured value of the elevation of the reference cable span and the reference value of the elevation of the reference cable span with the preset deviation value to obtain the comparison working condition;

[0010] When the comparison working condition is that the difference between the actual measured value of the elevation of the reference cable span and the reference value of the elevation of the reference cable span is less than the preset deviation value, it is determined that the actual measured value of the elevation of the reference cable span is the elevation of the reference cable span.

[0011] According to the first aspect, in a first possible implementation of the first aspect, before the step of using a damped single prism to observe and obtain the first span differential elevation of the reference cable and the second span differential elevation of the reference cable, the following steps are also included:

[0012] The first automatic total station and the second automatic total station are respectively installed on two control points with known elevations and plane coordinates on both sides of the suspension bridge.

[0013] According to the first aspect, in a second possible implementation of the first aspect, the step of using a damped single prism to observe and obtain the first span differential elevation of the reference cable and the second span differential elevation of the reference cable specifically includes the following steps:

[0014] Fixing the first damped single prism and the second damped single prism at the first span and the second span of the reference cable respectively, adjusting the prism rods vertically and adjusting them so that the first automatic total station and the second automatic total station can respectively aim at the prisms of the first damped single prism and the second damped single prism;

[0015] Observe and obtain the actual height difference measured value of the first damped single prism and the actual height difference measured value of the second damped single prism respectively;

[0016] The first span differential elevation of the reference cable and the second span differential elevation of the reference cable are obtained according to the obtained height difference measured value of the first damped single prism and the obtained height difference measured value of the second damped single prism.

[0017] According to the first aspect, in a third possible implementation of the first aspect, the step of obtaining the measured elevation value of the mid-span of the reference cable using a damped biprism observation specifically includes the following steps:

[0018] Fix the damping biprism at the mid-span of the reference cable;

[0019] Adjust the first automatic total station to sight the upper prism of the damping biprism and observe and obtain the measured height difference of the upper prism;

[0020] Adjust the second automatic total station to sight the lower prism of the damping biprism and observe and obtain the measured height difference of the lower prism;

[0021] According to the height difference measured by the upper prism and the height difference measured by the lower prism, the first differential elevation in the middle of the reference cable span and the second differential elevation in the middle of the reference cable span are obtained respectively;

[0022] The average value of the first differential elevation in the benchmark cable span and the second differential elevation in the benchmark cable span is taken as the actual measured value of the benchmark cable elevation.

[0023] According to the first aspect, in a fourth possible implementation of the first aspect, after the step of comparing the difference between the measured elevation value of the reference cable span and the reference elevation value of the reference cable span with the preset deviation value and obtaining the comparison working condition, the following steps are further included:

[0024] When the comparison condition is that the difference between the actual value of the elevation in the base cable span and the reference value of the elevation in the base cable span is less than the preset deviation value, the control re-acquires the reference value of the elevation in the base cable span and the actual value of the elevation in the base cable span.

[0025] In the second aspect, the present application provides a device for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-vibration environment, comprising two automatic total stations, two damped single prisms and one damped biprism. The two automatic total stations include a first automatic total station and a second automatic total station, which are respectively installed on two control points with known elevations and plane coordinates on both sides of the suspension bridge; the two damped single prisms are respectively fixed at the first span and the second span of the reference cable; and a damped biprism is fixed at the mid-span position of the reference cable.

[0026] According to the second aspect, in a first possible implementation of the second aspect, the damping single prism includes a first prism rod, a first fixing member fixed to one end of the first prism rod, a first damper fixed to the middle of the first prism rod, and a first prism fixed to the other end of the first prism rod, wherein the first fixing member is used to be fixed to the first span or the second span of the reference cable.

[0027] According to the first possible implementation of the second aspect, in the second possible implementation of the second aspect, the damping biprism includes a second prism rod, a second fixing member fixed to one end of the second prism rod, a second damper fixed to the middle of the second prism rod, and an upper prism and a lower prism fixed on the second prism rod, located between the second damper and the other end of the second prism rod and spaced apart up and down, and the second fixing member is used to be fixed at the middle of the span of the reference cable.

[0028] According to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the first fixing member and the second fixing member are both clamps.

[0029] In a third aspect, the present application provides a system for measuring the mid-span elevation of a suspension bridge reference cable in a wind-induced vibration environment, comprising:

[0030] The first and second span elevation acquisition modules are used to acquire the first span differential elevation and the second span differential elevation of the reference cable by using a damped single prism for observation;

[0031] a mid-span elevation reference value acquisition module, communicatively connected to the first and second span elevation acquisition modules, for fitting and acquiring a reference value of the mid-span elevation of the reference cable based on the acquired differential elevation of the first span of the reference cable and the differential elevation of the second span of the reference cable;

[0032] The mid-span elevation measured value acquisition module is used to obtain the mid-span elevation measured value of the benchmark cable using damped biprism observation;

[0033] a comparison module, which is in communication with the mid-span elevation reference value acquisition module and the mid-span elevation measured value acquisition module, and is used to compare the difference between the benchmark cable mid-span elevation measured value and the benchmark cable mid-span elevation reference value with a preset deviation value to obtain a comparison working condition;

[0034] The reference cable span mid-elevation acquisition module is communicated with the comparison module and is used to determine that the reference cable span mid-elevation measured value is the reference cable span mid-elevation when the comparison condition is that the difference between the reference cable span mid-elevation measured value and the reference cable span mid-elevation reference value is less than a preset deviation value.

[0035] Compared with the prior art, the advantages of the present invention are as follows:

[0036] The method for measuring the mid-span elevation of the reference cable of a suspension bridge in a wind-vibration environment provided by the present application adopts a damped single prism and a damped double prism to reduce the vibration of the prism in the wind-vibration environment, effectively reducing the measurement error of the actual measured value of the mid-span elevation, and obtaining the reference value of the mid-span elevation of the reference cable by fitting, which is conducive to ensuring the reliability of the mid-span elevation measurement of the reference cable in the wind-vibration environment; the method for measuring the mid-span elevation of the reference cable of a suspension bridge in a wind-vibration environment provided by the present application has small measurement error and strong reliability, thereby ensuring the measurement quality of the mid-span elevation of the reference cable in the wind-vibration environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the installation environment of the device for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment according to an embodiment of the present invention;

[0038] Figure 2 This is a flow chart of a method for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment according to an embodiment of the present invention;

[0039] Figure 3 2 is a schematic structural diagram of a device for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment according to an embodiment of the present invention;

[0040] Figure 4 1 is a schematic structural diagram of a damped single prism according to an embodiment of the present invention;

[0041] Figure 5 1 is a schematic structural diagram of a damped biprism according to an embodiment of the present invention;

[0042] Figure 6 This is a functional module block diagram of a system for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment according to an embodiment of the present invention.

[0043] 1. Damped single prism; 2. Damped double prism; 3. Clamp; 20. Tower column; 31. First automatic total station; 32. Second automatic total station; 41. First damper; 42. Second damper; 51. First prism rod; 52. Second prism rod; 61. First prism; 62. Upper prism; 62. Lower prism; 7. Reference cable; 100. First and second span elevation acquisition module; 200. Mid-span elevation reference value acquisition module; 300. Mid-span elevation measured value acquisition module; 400. Comparison module; 500. Reference cable mid-span elevation acquisition module. DETAILED DESCRIPTION

[0044] Reference will now be made in detail to specific embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Although the present invention will be described in conjunction with specific embodiments, it will be understood that the present invention is not intended to be limited to those embodiments. On the contrary, it is intended to cover variations, modifications, and equivalents within the spirit and scope of the present invention as defined by the appended claims. It should be noted that the method steps described herein can be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of the two.

[0045] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Note: The following example is only a specific example and is not intended to limit the embodiments of the present invention to the following specific steps, values, conditions, data, sequence, etc. Those skilled in the art can apply the concepts of the present invention to construct more embodiments not described in this specification by reading this specification.

[0047] Please refer to Figure 1 The reference cable 7 is clamped on the two towers 20, and a first automatic total station 31 and a second automatic total station 32 are respectively placed at two control points with known elevations and plane coordinates on both sides of the suspension bridge.

[0048] Please refer to Figure 2 The present application provides a method for measuring the mid-span elevation of a suspension bridge reference cable under a wind-induced vibration environment, comprising the following steps:

[0049] Step S1: Figure 4 The damped single prism observation shown is used to obtain the differential elevation of the first span of the reference cable and the differential elevation of the second span of the reference cable;

[0050] Step S2: fitting and obtaining a reference value of the mid-span elevation of the benchmark cable based on the obtained differential elevation of the first span of the benchmark cable and the differential elevation of the second span of the benchmark cable;

[0051] Step S3: Figure 5The damped bi-prism observation shown is used to obtain the measured value of the mid-span elevation of the benchmark cable;

[0052] Step S4, comparing the difference between the measured value of the elevation of the reference cable span and the reference value of the elevation of the reference cable span with a preset deviation value to obtain a comparison working condition;

[0053] Step S5: When the comparison condition is that the difference between the actual value of the elevation of the reference cable span and the reference value of the elevation of the reference cable span is less than the preset deviation value, it is determined that the actual value of the elevation of the reference cable span is the elevation of the reference cable span.

[0054] The method for measuring the mid-span elevation of the reference cable of a suspension bridge in a wind-vibration environment provided by the present application adopts a damped single prism and a damped double prism to reduce the vibration of the prism in the wind-vibration environment, effectively reducing the measurement error of the actual measured value of the mid-span elevation, and obtaining the reference value of the mid-span elevation of the reference cable by fitting, which is conducive to ensuring the reliability of the mid-span elevation measurement of the reference cable in the wind-vibration environment; the method for measuring the mid-span elevation of the reference cable of a suspension bridge in a wind-vibration environment provided by the present application has small measurement error and strong reliability, thereby ensuring the measurement quality of the mid-span elevation of the reference cable in the wind-vibration environment.

[0055] In one embodiment, the first span and the second span are located on both sides of the mid-span, and the mid-span is a position of 1 / 2 of the span of the reference cable.

[0056] In a more specific embodiment, the first span is at a position of 1 / 4 of the span of the reference cable, and the second span is at a position of 3 / 4 of the span of the reference cable.

[0057] In one embodiment, before step S1, the step of obtaining the first span differential elevation of the reference cable and the second span differential elevation of the reference cable using a damped single prism for observation, the following steps are further included:

[0058] Step S0: construct a test environment, and install the first automatic total station and the second automatic total station on two control points with known elevations and plane coordinates on both sides of the suspension bridge respectively.

[0059] In one embodiment, step S1, using a damped single prism to observe and obtain the first span differential elevation of the reference cable and the second span differential elevation of the reference cable, specifically includes the following steps:

[0060] Step S11, fixing the first damped single prism and the second damped single prism at the first span and the second span of the reference cable respectively, adjusting the prism rods vertically and adjusting them so that the first automatic total station and the second automatic total station are respectively aimed at the prisms of the first damped single prism and the second damped single prism;

[0061] Step S12: observing and obtaining the actual height difference value of the first damped single prism and the actual height difference value of the second damped single prism respectively;

[0062] Step S13: Obtain the first span differential elevation of the reference cable and the second span differential elevation of the reference cable according to the obtained actual height difference measured values of the first damped single prism and the second damped single prism.

[0063] In one embodiment, in step S12, multiple groups of height difference observation values of the first damped single prism and the second damped single prism are obtained, each group is observed several times, and the average of all groups of height difference observation values of the first damped single prism and the average of all groups of height difference observation values of the second damped single prism are taken as the actual height difference measured values of the first damped single prism and the second damped single prism, respectively. By taking the average of multiple groups of height difference observation values, the actual height difference measured value of the damped single prism is obtained, thereby reducing the measurement error of the actual height difference measured value of the damped single prism.

[0064] In one embodiment, step S13 is specifically implemented as follows:

[0065] According to the measured height difference values of the first damped single prism and the second damped single prism, the length of the corresponding first prism rod, the thickness of the clamp and the distance from the center of the reference cable to the inner wall of the clamp are subtracted respectively to obtain the first span differential elevation of the reference cable and the second span differential elevation of the reference cable.

[0066] In one embodiment, step S2 specifically includes the following steps:

[0067] Step S21: The reference cable is clamped to the two towers with a clamp. The elevation of the reference cable at the center of the main cable saddle of the two towers is obtained based on the known elevation of the center of the main cable saddle of the two towers and the distance from the center of the reference cable to the inner wall of the clamp.

[0068] Step S22: Based on the differential elevations of the first and second spans of the reference cable obtained in step S13, and in combination with the theoretical linear shape calculation formula for the reference cable, a fitted elevation at half the span of the reference cable is calculated as a reference value for the mid-span elevation of the reference cable. By using the multi-point mid-span elevation fitting method for the reference cable linear shape, the fitted elevation at the mid-span of the reference cable is observed and calculated as the reference value for the mid-span elevation of the reference cable, which helps ensure the reliability of the measured mid-span elevation of the reference cable in wind-induced vibration environments.

[0069] In one embodiment, the step S3, obtaining the measured value of the mid-span elevation of the reference cable using a damped biprism for observation, specifically includes the following steps:

[0070] Step S31, fixing the damping biprism at the mid-span of the reference cable;

[0071] Step S32: Adjust the first automatic total station to sight the upper prism of the damping biprism, and observe and obtain the measured height difference of the upper prism;

[0072] Step S33: Adjust the second automatic total station to sight the lower prism of the damping biprism, and observe and obtain the measured height difference of the lower prism;

[0073] Step S34: Obtain a first differential elevation in the middle of the reference cable span and a second differential elevation in the middle of the reference cable span according to the actual height difference measured by the upper prism and the actual height difference measured by the lower prism;

[0074] Step S35: take the average of the first differential elevation in the reference cable span and the second differential elevation in the reference cable span as the actual measured value of the reference cable elevation.

[0075] In one embodiment, in step S32 and step S33, multiple groups of upper prism observation values and multiple groups of lower prism observation values are obtained, and the average is calculated respectively to obtain the actual measured height difference of the upper prism and the actual measured height difference of the lower prism, and the measurement error of the actual measured height difference of the upper prism and the lower prism is reduced by the average observation method.

[0076] In one embodiment, after the step of comparing the difference between the measured elevation value of the reference cable span and the reference elevation value of the reference cable span with the preset deviation value and obtaining the comparison working condition, the following steps are further included:

[0077] When the comparison condition is that the difference between the actual measured value of the elevation in the benchmark cable span and the reference value of the elevation in the benchmark cable span is less than the preset deviation value, the control re-acquires the reference value of the elevation in the benchmark cable span and the actual measured value of the elevation in the benchmark cable span, and repeats steps S1-S4 until the difference between the actual measured value of the elevation in the benchmark cable span and the reference value of the elevation in the benchmark cable span is less than the preset deviation value, and it is determined that the actual measured value of the elevation in the benchmark cable span is the elevation in the benchmark cable span.

[0078] In a more specific embodiment, please refer to Figure 1 The method for measuring the mid-span elevation of a suspension bridge reference cable under a wind-induced vibration environment provided by this application is implemented in the following steps:

[0079] Step 1: Use the first automatic total station at a known elevation point DQ1 to observe the central prism of the second automatic total station at another known elevation point DQ2 to obtain the atmospheric refraction coefficient K1:

[0080]

[0081] Where S1 is the horizontal distance across the river from the center of the first automatic total station to the central prism of the second automatic total station, a1 is the vertical angle of the first automatic total station observing the central prism of the second automatic total station, i1 is the instrument height of the first automatic total station, v2 is the height of the central prism of the second automatic total station, R is the radius of curvature of the earth, H DQ1 、H DQ2 The elevation is known.

[0082] Step 2: Observe the measured elevation of point A at 1 / 4 span by the first automatic total station, and use K1 to perform atmospheric refraction correction on the measured elevation of point A at 1 / 4 span to obtain the differential elevation H of point A at 1 / 4 span. A ;

[0083]

[0084] Among them, S A is the horizontal distance from the center of the first automatic total station to A, a A is the vertical angle of the first automatic total station observing A, i1 is the height of the first total station, v A is the height of the prism at point A.

[0085] Step 3: Use the second automatic total station at the known elevation point DQ2 to observe the central prism of the first automatic total station at another known elevation point DQ1 to obtain the atmospheric refraction coefficient K2:

[0086]

[0087] Among them, S2 is the horizontal distance across the river from the center of the second automatic total station to the central prism of the first automatic total station, a2 is the vertical angle of the second automatic total station observing the central prism of the first automatic total station, i2 is the instrument height of the second automatic total station, v1 is the height of the central prism of the first automatic total station, R is the radius of curvature of the earth, H DQ1 、H DQ2 The elevation is known.

[0088] Step 4: Observe the measured elevation of point C at 3 / 4 span by the second automatic total station, and use K2 to perform atmospheric refraction correction on the measured elevation of point C at 3 / 4 span to obtain the differential elevation H of point C at 3 / 4 span. C ;

[0089]

[0090] Among them, S C is the horizontal distance from the center of the second automatic total station to C, a C is the vertical angle of the second automatic total station observing C, i2 is the height of the second automatic total station, v C is the height of the prism at point C.

[0091] Step 5: Similarly, use the first automatic total station to obtain the measured elevation and differential elevation of point B in the mid-span, and use the second automatic total station to obtain the measured elevation and differential elevation of point B in the mid-span, and take the average of the two differential elevations as the measured value of the mid-span elevation;

[0092] Step 6: Based on the theoretical linear calculation formula of the reference cable, the known elevations of reference cable points T1 and T2 at the tower saddle, and the differential elevations of points A and C, calculate the fitted elevation of point B at the mid-span as the reference value of the mid-span elevation of point B of the reference cable;

[0093] Step 7. Compare the difference between the actual measured value of the mid-span elevation and the reference value of the mid-span elevation with the preset deviation value. If the difference is less than the preset deviation value, the actual measured value of the mid-span elevation obtained this time is determined to be the final mid-span elevation value to be obtained; if the difference is not less than the preset deviation value, repeat steps 1 to 6 and re-compare until the difference is less than the preset deviation value, and determine that the actual measured value of the mid-span elevation obtained this time is the final mid-span elevation value to be obtained.

[0094] Second, please refer to Figure 3 The present application provides a device for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment, comprising two automatic total stations, two damped single prisms 1 and a damped biprism 2. The two automatic total stations include a first automatic total station 31 and a second automatic total station 32, which are respectively installed on two control points with known elevations and plane coordinates on both sides of the suspension bridge; the two damped single prisms 1 are respectively fixed at the first span and the second span of the reference cable; and a damped biprism 2 is fixed at the mid-span position of the reference cable.

[0095] In one embodiment, if Figure 4 As shown, the damping single prism 1 includes a first prism rod 51, a first fixing member fixed to one end of the first prism rod 51, a first damper 41 fixed to the middle of the first prism rod, and a first prism 61 fixed to the other end of the first prism rod 51, wherein the first fixing member is used to be fixed to the first span or the second span of the reference cable.

[0096] In one embodiment, if Figure 5 As shown, the damping biprism includes a second prism rod 52, a second fixing member fixed to one end of the second prism rod 52, a second damper 42 fixed to the middle of the second prism rod 52, and an upper prism 62 and a lower prism 63 fixed to the second prism rod 52, located between the second damper 42 and the other end of the second prism rod 52 and spaced apart above and below. The second fixing member is used to be fixed at the middle of the span of the reference cable.

[0097] In one embodiment, the first fixing member and the second fixing member are both clamps 3 .

[0098] Thirdly, please refer to Figure 6The present application provides a system for measuring the mid-span elevation of a reference cable of a suspension bridge under a wind-induced vibration environment, including first and second span elevation acquisition modules 100, a mid-span elevation reference value acquisition module 200, a mid-span elevation measured value acquisition module 300, a comparison module 400, and a reference cable mid-span elevation acquisition module 500.

[0099] The first and second span elevation acquisition modules 100 are used to acquire the first span differential elevation of the reference cable and the second span differential elevation of the reference cable by using a damped single prism for observation;

[0100] The mid-span elevation reference value acquisition module 200 is in communication with the first and second span elevation acquisition modules 100 and is configured to obtain the mid-span elevation reference value of the reference cable by fitting according to the obtained first span differential elevation and second span differential elevation of the reference cable;

[0101] The mid-span elevation measured value acquisition module 300 is used to obtain the mid-span elevation measured value of the reference cable by using a damped biprism observation;

[0102] The comparison module 400 is in communication with the mid-span elevation reference value acquisition module 200 and the mid-span elevation measured value acquisition module 300, and is used to compare the difference between the reference cable mid-span elevation measured value and the reference cable mid-span elevation reference value with a preset deviation value to obtain a comparison condition;

[0103] The reference cable span mid-elevation acquisition module 500 is communicatively connected to the comparison module 400, and is used to determine that the reference cable span mid-elevation measured value is the reference cable span mid-elevation when the comparison condition is that the difference between the reference cable span mid-elevation measured value and the reference cable span mid-elevation reference value is less than a preset deviation value.

[0104] Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, all or part of the method steps of the above method are implemented.

[0105] The present invention implements all or part of the process in the above method, and can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of each of the above method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0106] Based on the same inventive concept, an embodiment of the present application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program running on the processor, and when the processor executes the computer program, all or part of the method steps in the above method are implemented.

[0107] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of a computer device and connects various parts of the entire computer device using various interfaces and lines.

[0108] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the computer device by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the mobile phone (such as audio data, video data, etc.). In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0109] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, servers, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage) containing computer-usable program code.

[0110] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), servers, and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0111] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0112] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0113] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions, characterized in that: The following steps are involved: The damped single prism is used to obtain the differential elevation of the first span of the reference cable and the differential elevation of the second span of the reference cable; According to the obtained differential elevation of the first span of the benchmark cable and the differential elevation of the second span of the benchmark cable, the reference value of the mid-span elevation of the benchmark cable is obtained by fitting; Damped biprism observation is used to obtain the measured value of the mid-span elevation of the benchmark cable; Compare the difference between the measured value of the elevation of the reference cable span and the reference value of the elevation of the reference cable span with the preset deviation value to obtain the comparison working condition; When the comparison working condition is that the difference between the actual measured value of the elevation of the reference cable span and the reference value of the elevation of the reference cable span is less than the preset deviation value, it is determined that the actual measured value of the elevation of the reference cable span is the elevation of the reference cable span; The step of using a damped single prism to observe and obtain the first span differential elevation of the reference cable and the second span differential elevation of the reference cable specifically includes the following steps: Fixing the first damped single prism and the second damped single prism at the first span and the second span of the reference cable respectively, adjusting the prism rods vertically and adjusting them so that the first automatic total station and the second automatic total station can respectively aim at the prisms of the first damped single prism and the second damped single prism; Observe and obtain the actual height difference measured value of the first damped single prism and the actual height difference measured value of the second damped single prism respectively; Obtaining a first span differential elevation of the reference cable and a second span differential elevation of the reference cable according to the obtained height difference measured value of the first damped single prism and the obtained height difference measured value of the second damped single prism; The step of using a damped biprism to observe and obtain the measured value of the elevation of the reference cable mid-span specifically includes the following steps: Fix the damping biprism at the mid-span of the reference cable; Adjust the first automatic total station to sight the upper prism of the damping biprism and observe and obtain the measured height difference of the upper prism; Adjust the second automatic total station to sight the lower prism of the damping biprism and observe and obtain the measured height difference of the lower prism; According to the height difference measured by the upper prism and the height difference measured by the lower prism, the first differential elevation in the middle of the reference cable span and the second differential elevation in the middle of the reference cable span are obtained respectively; The average value of the first differential elevation in the benchmark cable span and the second differential elevation in the benchmark cable span is taken as the actual measured value of the benchmark cable elevation.

2. The method for measuring the mid-span elevation of a suspension bridge reference cable under a wind-induced vibration environment according to claim 1, wherein: Before the step of using a damped single prism to observe and obtain the first span differential elevation of the reference cable and the second span differential elevation of the reference cable, the following steps are also included: The first automatic total station and the second automatic total station are respectively installed on two control points with known elevations and plane coordinates on both sides of the suspension bridge.

3. The method for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions according to claim 1, wherein: After the step of comparing the difference between the measured elevation value of the reference cable span and the reference elevation value of the reference cable span and the preset deviation value, and obtaining the comparison working condition, the following steps are also included: When the comparison condition is that the difference between the actual value of the elevation in the base cable span and the reference value of the elevation in the base cable span is less than the preset deviation value, the control re-acquires the reference value of the elevation in the base cable span and the actual value of the elevation in the base cable span.

4. A device for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions, which implements the method for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions as claimed in claim 1, characterized in that: include: Two automatic total stations, including a first automatic total station and a second automatic total station, are respectively installed at two control points with known elevations and plane coordinates on both sides of the suspension bridge; Two damping single prisms are fixed at the first span and the second span of the reference cable respectively; A damping biprism is fixed at the mid-span of the reference cable.

5. The device for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions according to claim 4, characterized in that: The damping single prism includes a first prism rod, a first fixing member fixed to one end of the first prism rod, a first damper fixed to the middle of the first prism rod, and a first prism fixed to the other end of the first prism rod, wherein the first fixing member is used to be fixed to the first span or the second span of the reference cable.

6. The device for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions according to claim 5, characterized in that: The damping biprism includes a second prism rod, a second fixing member fixed to one end of the second prism rod, a second damper fixed to the middle of the second prism rod, and an upper prism and a lower prism fixed to the second prism rod between the second damper and the other end of the second prism rod and spaced apart up and down. The second fixing member is used to be fixed at the middle of the span of the reference cable.

7. The device for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions according to claim 6, characterized in that: The first fixing member and the second fixing member are both clamps.

8. A system for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions, which implements the method for measuring the mid-span elevation of a suspension bridge reference cable under wind-induced vibration conditions as claimed in claim 1, characterized in that: include: The first and second span elevation acquisition modules are used to acquire the first span differential elevation and the second span differential elevation of the reference cable by using a damped single prism for observation; a mid-span elevation reference value acquisition module, communicatively connected to the first and second span elevation acquisition modules, for fitting and acquiring a reference value of the mid-span elevation of the reference cable based on the acquired differential elevation of the first span of the reference cable and the differential elevation of the second span of the reference cable; The mid-span elevation measured value acquisition module is used to obtain the mid-span elevation measured value of the benchmark cable using damped biprism observation; a comparison module, which is in communication with the mid-span elevation reference value acquisition module and the mid-span elevation measured value acquisition module, and is used to compare the difference between the benchmark cable mid-span elevation measured value and the benchmark cable mid-span elevation reference value with a preset deviation value to obtain a comparison working condition; The reference cable span mid-elevation acquisition module is communicated with the comparison module and is used to determine that the reference cable span mid-elevation measured value is the reference cable span mid-elevation when the comparison condition is that the difference between the reference cable span mid-elevation measured value and the reference cable span mid-elevation reference value is less than a preset deviation value.

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