A method and system for automatically monitoring cable clamp slippage online, and a readable storage medium

Abstract

The present invention relates to the technical field of bridge construction, and in particular to an automated online monitoring method and system for cable clamp slippage, and a readable storage medium. The displacement data of the cable clamp relative to the main cable collected by the displacement meter is sampled according to a preset sampling frequency, and the temperature data collected by the thermometer is sampled. The average temperature vector T of the temperature of the same cross section of the main cable is obtained according to the temperature data, and the displacement monitoring vector X of the cable clamp relative to the main cable is obtained according to the displacement data. According to the linear correlation equation between the average temperature vector and the displacement monitoring vector, the corrected cable clamp slippage value is obtained. The automated online monitoring device for cable clamp slippage samples the cable clamp slippage displacement data and the structural temperature near the cable clamp through the displacement meter and the thermometer, and can combine the measurement results of the thermometer and the displacement meter, and after algorithm correction, eliminate the temperature influence to obtain an accurate cable clamp slippage value.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to an automatic online monitoring method and system for cable clamp slippage, and a readable storage medium. Background Art

[0002] The cable clamp is an important component of the suspension bridge. It is a tool that connects the sling and the main cable, and is an important part that transfers the load on the sling to the main cable. The cable clamp is usually made of cast steel, and the common structure is left and right halves or upper and lower halves. It is fixed at a specific position of the main cable by high-strength bolts, so that the inner wall of the cable clamp exerts pressure on the main cable of the suspension bridge, preventing the cable clamp from sliding down along the main cable of the suspension bridge.

[0003] In order to ensure the safety of suspension bridges, the cable clamps on the main cables of suspension bridges should be checked for slippage. Currently, the cable clamp slippage inspection usually adopts the manual inspection method, which is time-consuming and labor-intensive, with low detection accuracy and low detection frequency, and the problems cannot be found in time, and the detection data cannot be traced. In addition, there is also the problem of high risk of technicians working at high altitudes.

[0004] In view of this, it is necessary to propose an automated online monitoring method and system for cable clamp slippage, and a readable storage medium to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide an automated online monitoring method and system for cable clamp slippage, and a readable storage medium, so as to solve the problem that the existing cable clamp slippage inspection usually adopts the manual inspection method, which is time-consuming and labor-intensive, has low detection accuracy, low detection frequency, cannot find problems in time, and the detection data cannot be traced. In addition, there is also the problem that the technicians have great risks in high-altitude operations.

[0006] To achieve the above object, the present invention provides an automated online monitoring method for cable clamp slippage, comprising the following steps:

[0007] The displacement data of the cable clamp relative to the main cable collected by the displacement meter is sampled according to a preset sampling frequency, wherein the displacement meter is fixedly mounted on the main cable above the cable clamp and is separated from the cable clamp by a preset distance, and the mobile end of the displacement meter is fixed on the cable clamp;

[0008] Sampling the temperature data collected by the thermometer according to a preset sampling frequency, wherein the multiple thermometers are respectively arranged around the main cable and close to the cable clamp;

[0009] Acquire an average temperature vector T of the temperature of the same cross section of the main cable according to the temperature data, and acquire a displacement monitoring vector X of the cable clamp relative to the main cable according to the displacement data;

[0010] According to the linear correlation equation between the average temperature vector and the displacement monitoring vector: Y=X-(KT-A), the corrected cable clamp slip value is obtained; where Y is the corrected cable clamp slip vector, and K and A are the correlation fitting constants between temperature and displacement.

[0011] Preferably, the method further comprises the steps of:

[0012] According to whether the cable clamp slippage value satisfies the preset threshold value for 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold value, it is judged whether the cable clamp slippage value satisfies the automatic alarm triggering condition;

[0013] When the cable clamp slippage value is greater than the preset threshold value for 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold value, it is determined that the automatic alarm triggering condition is met and the preset automatic alarm instruction is executed;

[0014] When the cable clamp slippage value does not exceed the preset threshold for 10 consecutive times and the average value within 10 minutes is greater than the preset threshold, the automatic alarm triggering condition is not met and the current state is maintained.

[0015] Preferably, the preset distance is 5-15 cm.

[0016] Preferably, the number of the thermometers is no less than 4, and the thermometers are evenly distributed around the main cable.

[0017] Preferably, the preset sampling frequency is once a minute.

[0018] Preferably, the method further comprises the step of: performing algorithm correction on the collected displacement data and temperature data.

[0019] Preferably, the algorithm correction includes one or more of filtering and removing outliers.

[0020] Preferably, the preset threshold is not greater than 10 mm.

[0021] Preferably, the displacement meter is one or more of a fiber Bragg grating displacement meter, a resistance strain displacement meter, a pull-rope displacement meter, and a magnetostrictive displacement meter, and the measurement accuracy of the displacement meter is not less than 0.1 mm; the thermometer is one or more of a fiber Bragg grating type, a platinum resistor type, and an infrared thermometer, and the measurement accuracy of the thermometer is not less than 0.5°C.

[0022] The present invention also provides an automated online monitoring system for cable clamp slippage, comprising an automated online monitoring device for cable clamp slippage and a control system arranged on the automated online monitoring device for cable clamp slippage, the control system comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. Preferably, the automated online monitoring device for cable clamp slippage comprises at least one displacement meter arranged on a main cable above the cable clamp and separated from the cable clamp by a preset distance, and a plurality of thermometers evenly arranged around the main cable and close to the cable clamp, wherein a mobile end of the displacement meter is fixed on the cable clamp; when the processor executes the computer program, the steps of the automated online monitoring method for cable clamp slippage as described above are implemented.

[0023] The present invention also provides a readable storage medium, wherein the readable storage medium stores the computer program. Preferably, when the computer program is executed by the processor, the steps of the above-mentioned method for automatic online monitoring of cable clamp slippage are implemented.

[0024] Compared with the prior art, the automatic online monitoring method and system for cable clamp slippage and the readable storage medium provided by the present invention have the following beneficial effects:

[0025] The automatic online monitoring method and system for cable clamp slippage provided by the present invention, and the readable storage medium, include the steps of: sampling the displacement data of the cable clamp relative to the main cable collected by the displacement meter according to a preset sampling frequency, sampling the temperature data collected by the thermometer according to a preset sampling frequency, obtaining the average temperature vector T of the same cross-section temperature of the main cable according to the temperature data, obtaining the displacement monitoring vector X of the cable clamp relative to the main cable according to the displacement data, and obtaining the corrected cable clamp slippage value according to the linear correlation equation between the average temperature vector and the displacement monitoring vector: Y=X-(KT-A). At the same time, an automatic alarm module is also provided, and an automatic alarm will be triggered if the cable clamp slippage value exceeds the preset threshold. The advantages of the device and system are that the automatic measurement of cable clamp slippage is realized, the test frequency is high, and problems can be discovered in time; the cable clamp slippage value after temperature correction has high measurement accuracy; and an automatic alarm can be triggered when the monitoring value exceeds the limit. Thus, the automatic online monitoring of cable clamp slippage is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1This is an application scenario diagram of a method and system for automatically monitoring the slippage of a cable clamp and a readable storage medium in one embodiment of the present invention;

[0028] Figure 2 It is a schematic flow chart of an automated online monitoring method for cable clamp slippage in one embodiment of the present invention;

[0029] Figure 3 It is a structural block diagram of a method and system for automatically monitoring the slippage of a cable clamp on-line, and a control system of a readable storage medium in one embodiment of the present invention.

[0030] Figure 4 It is an overall stereogram of an automatic online monitoring device for cable clamp slippage in one embodiment of the present invention;

[0031] Figure 5 It is an overall front view of an automatic online monitoring device for cable clamp slippage in one embodiment of the present invention;

[0032] Figure 6 It is an overall right side view of an automatic online monitoring device for cable clamp slippage in one embodiment of the present invention;

[0033] Figure 7 It is an overall top view of an automatic online monitoring device for cable clamp slippage in one embodiment of the present invention;

[0034] Figure 8 The figure is an overall structural block diagram of an automatic online monitoring system for cable clamp slippage in one embodiment of the present invention.

[0035] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0036] Description of Figure Numbers:

[0037] Processor 51; Memory 52; Computer program 53;

[0038] Main cable 100; main cable upper end 101; main cable lower end 102;

[0039] Cable clamp 110; cable clamp left half 111; cable clamp right half 112; high-strength bolt 113; cable clamp inner wall 114; cable clamp end face 115;

[0040] Displacement meter 120; displacement meter fixed end 121; displacement meter moving end 122;

[0041] Thermometer 130;

[0042] Data gateway 140;

[0043] Server 150;

[0044] Mobile terminal 160;

[0045] Computer terminal 170. DETAILED DESCRIPTION

[0046] 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.

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] The automatic online monitoring method and system for cable clamp slippage and the readable storage medium provided by the present invention can be applied to Figure 1 In the application environment shown. The application environment includes a terminal 11, a terminal 12, a server 13 and an automatic online monitoring device for cable clamp slippage 14; wherein the terminal 11 and the terminal 12 communicate with the server 13, and the server 13 communicates with the automatic online monitoring device for cable clamp slippage 14. The terminal 11 may be a terminal used by a user, and the terminal 12 may also be a terminal used by an operator. The terminal may be, but is not limited to, various smart phones, desktop computers, tablet computers and portable wearable devices, and the server 13 may be implemented with an independent server or a server cluster consisting of multiple servers.

[0051] Please see attached Figure 2 The automatic online monitoring method for cable clamp slippage in one embodiment of the present invention comprises the following steps:

[0052] Step S1, sampling the displacement data of the cable clamp relative to the main cable collected by the displacement meter according to the preset sampling frequency; sampling the temperature data collected by the thermometer according to the preset sampling frequency. The sampling frequencies of the displacement meter and the thermometer are kept consistent. Preferably, the sampling frequency in this embodiment is once a minute, that is, the displacement meter and the thermometer are synchronously sampled at the same time according to the sampling frequency of once a minute, so that the displacement data and temperature data collected each time can be guaranteed to be data at the same time, so as to perform subsequent analysis and calculation.

[0053] Step S2, obtaining the average temperature vector T of the temperature of the same cross section of the main cable according to the temperature data, and obtaining the displacement monitoring vector X of the cable clamp relative to the main cable according to the displacement data. Specifically, the temperature data of multiple thermometers arranged around the main cable and close to the cable clamp are obtained. Multiple thermometers are arranged on the same cross section of the main cable. Since the temperature of the same cross section is different, the average temperature vector obtained by the multiple thermometers on the same cross section is taken as the temperature corrected by the algorithm, thereby improving the accuracy of the final monitored slip value. Preferably, in this embodiment, the number of thermometers is 8, which are evenly arranged around the circumference of the main cable.

[0054] In addition, the displacement meter includes a fixed end and a mobile end. Since the displacement meter is a contact sensor, the mobile end of the displacement meter needs to contact the object to be measured. It should be noted here that as the use time of the cable clamp increases, the material, internal structure and imbalance of the load will cause the cable clamp to slip along the lower end of the main cable. At this time, through the telescopic movement of the mobile end of the displacement meter, the displacement value of the cable clamp can be obtained in real time, that is, the displacement monitoring vector of the cable clamp relative to the main cable is obtained through the displacement meter.

[0055] Step S3, according to the linear correlation equation between the average temperature vector and the displacement monitoring vector: Y = X-(KT-A), obtain the corrected cable clamp slip value. Among them, Y is the corrected cable clamp slip vector, K and A are the correlation fitting constants between temperature and displacement, and the least squares method is used for fitting, and the correlation coefficient shall not be less than 0.85.

[0056] Step S4, performing algorithm correction on the collected displacement data and temperature data. Specifically, the algorithm correction method includes but is not limited to filtering the collected temperature data and displacement data, removing abnormal values ​​and other conventional processing. For example, in the acquired data, if some data suddenly increases or decreases abnormally or some data that does not meet the preset conditions is removed, the accuracy of the final cable clamp slip value can be improved through algorithm correction.

[0057] Step S5, judging whether the cable clamp slippage value satisfies the automatic alarm triggering condition. Specifically, the automatic alarm triggering condition is based on whether the cable clamp slippage value satisfies at least one of the conditions that it is greater than the preset threshold value for at least 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold value. To realize the automatic online monitoring of the cable clamp slippage value, by setting the preset threshold value, introducing the automatic alarm module, according to the temperature data and displacement data obtained by the above sampling frequency, and the cable clamp slippage value obtained by combining the temperature data and the displacement data, it is judged whether it satisfies at least one of the conditions that it is greater than the preset threshold value for at least 10 consecutive times and / or the average cable clamp slippage value within 10 minutes is greater than the preset threshold value. If it is satisfied, execute step S6, otherwise, execute step S7. Furthermore, the preset threshold value is not greater than 10 mm. The reliability of online monitoring can be effectively improved by analyzing and judging through continuous multiple counting or monitoring for a certain period of time.

[0058] Step S6, determine that it meets the automatic alarm triggering condition, and execute the preset automatic alarm instruction. That is, if at least one of the above-mentioned 10 consecutive times greater than the preset threshold and / or the average value within 10 minutes is greater than the preset threshold is met, it is determined that it meets the automatic alarm triggering condition, and executes the preset automatic alarm instruction. Specifically, the automatic alarm instruction includes but is not limited to automatic alarming by sound and light or sending information.

[0059] Step S7: If the automatic alarm triggering condition is not met, the current state is maintained. That is, if the value is greater than the preset threshold for 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold, it is determined that the automatic alarm triggering condition is not met and the current normal monitoring state is maintained.

[0060] The embodiment of the present invention provides an automatic online monitoring system for cable clamp slippage. For a structural block diagram of the control system, please refer to Figure 3 The control system includes an automated online monitoring device for cable clamp slippage and a control system arranged on the monitoring device. The control system includes a memory 52, a processor 51, and a computer program 53 stored in the memory 52 and executable on the processor 51. When the processor 51 executes the computer program 53, the steps of the automated online monitoring method for cable clamp slippage as described above are implemented.

[0061] An embodiment of the present invention provides a readable storage medium, wherein the readable storage medium stores the computer program 53, and when the computer program 53 is executed by the processor 51, the steps of the above-mentioned method for automatic online monitoring of cable clamp slippage are implemented. It can be understood that when the computer program 53 is executed by the processor 51, the above-mentioned method for automatic online monitoring of cable clamp slippage is implemented, so all embodiments of the above-mentioned method are applicable to the computer readable storage medium, and can achieve the same or similar beneficial effects.

[0062] Please see attached Figure 4-8 The automatic online monitoring device for cable clamp slippage in an embodiment of the present invention comprises: a main cable 100; a cable clamp 110 fixedly installed below the main cable 100; at least one displacement meter 120 arranged on the main cable 100 above the cable clamp 110 and separated from the cable clamp 110 by a preset distance, and the movable end 122 of the displacement meter is fixed on the cable clamp 110; and a plurality of thermometers 130 uniformly arranged around the main cable 100 and close to the cable clamp 110. Among them, the cable clamp 110 structure is generally a left-right half type and an upper-lower half type. This embodiment takes the left-right half type cast steel cable clamp 110 as an example. The left half 111 and the right half 112 of the cable clamp are fixedly installed at a specific position of the main cable 100 by a plurality of high-strength bolts 113. After installation, the inner wall 114 of the cable clamp can generate pressure on the main cable 100 through the tightening action of the high-strength bolts 113, so that the cable clamp 110 can be effectively prevented from sliding downward along the main cable 100. The displacement meter 120 is arranged at the main cable lower end 102 near the cable clamp 110. It should be clarified here that the main cables 100 on both sides of the cable clamp 110 include a main cable high end 101 and a main cable low end 102. The slippage of the cable clamp 110 refers to the relative movement of the cable clamp 110 along the direction of the main cable low end 102.

[0063] Please also read Figure 4 The displacement meter 120 includes a displacement meter fixed end 121 and a displacement meter mobile end 122. The displacement meter fixed end 121 is installed on the main cable 100. Since the displacement meter 120 is a contact sensor, the displacement meter mobile end 122 needs to be fixedly installed on the cable clamp 110, specifically in contact with the cable clamp end surface 115. It should be noted here that as the cable clamp 110 is used for a longer time, the material, internal structure, and the imbalance of the load will cause the cable clamp 110 to slip along the lower end 102 of the main cable. At this time, through the telescopic movement of the displacement meter mobile end 122, the displacement value of the cable clamp 110 can be obtained in real time. In addition, the number of displacement meters 120 can be one or more. In this embodiment, the number of displacement meters 120 used is one. At the same time, a plurality of thermometers 130 are evenly arranged around the main cable 100 and close to the cable clamp 110. Since temperature changes will affect structural changes, such as affecting the expansion coefficient of an object, it is necessary to perform algorithm correction on the displacement data monitored by the displacement meter 120 to eliminate the influence of temperature, so as to obtain an accurate cable clamp slip value, and a cable clamp 110 slip monitoring threshold can also be set. When the monitored value exceeds the monitoring threshold, the automatic alarm device can be activated in time, so that the technical personnel can deal with it in time.

[0064] The specific methods and steps for algorithm correction are as follows:

[0065] The displacement data of the cable clamp 110 relative to the main cable 100 collected by the displacement meter 120 is sampled according to a preset sampling frequency;

[0066] Sampling the temperature data collected by the thermometer 130 according to a preset sampling frequency;

[0067] Acquire an average temperature vector T of the temperature of the same cross section of the main cable 100 according to the temperature data, and acquire a displacement monitoring vector X of the cable clamp 110 relative to the main cable 100 according to the displacement data;

[0068] According to the linear correlation equation between the average temperature vector and the displacement monitoring vector: Y=X-(KT-A), the corrected cable clamp slip value is obtained; wherein Y is the corrected cable clamp slip vector, K and A are the correlation fitting constants between temperature and displacement, and the correlation coefficient shall not be less than 0.85.

[0069] According to whether the cable clamp slippage value satisfies the preset threshold value for 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold value, it is judged whether the cable clamp slippage value satisfies the automatic alarm triggering condition;

[0070] When the cable clamp slippage value is greater than the preset threshold value for 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold value, it is determined that the automatic alarm triggering condition is met and the preset automatic alarm instruction is executed;

[0071] When the cable clamp slippage value does not exceed the preset threshold for 10 consecutive times and the average value within 10 minutes is greater than the preset threshold, the automatic alarm triggering condition is not met and the current state is maintained.

[0072] The automatic online monitoring device and system for cable clamp slippage collects displacement data of cable clamp slippage at a certain sampling frequency through the displacement meter 120, collects the structural temperature near the cable clamp 110 at a certain sampling frequency through the thermometer 130, combines the measurement results of the thermometer 130 and the measurement results of the displacement meter 120, and eliminates the temperature influence through algorithm correction to obtain an accurate cable clamp slippage value. It can realize the automatic measurement of cable clamp slippage, with a high test frequency, and can find problems in time. At the same time, the cable clamp slippage value after temperature correction has high measurement accuracy. In addition, when the monitoring value exceeds the limit, an alarm can be automatically issued, thereby realizing the automatic online monitoring of cable clamp slippage.

[0073] As a specific embodiment of the present invention, the preset distance is 5-15cm. Specifically, the preset distance refers to the minimum distance from the fixed end 121 of the displacement meter to the cable clamp end face 115. Of course, the preset distance can be set according to the actual situation. The main influencing factor is the type of sensor selected. The travel of the mobile end 122 of different types of displacement meters is different. Since the displacement meter 120 is a contact sensor, the mobile end of the displacement meter 120 needs to contact the measured object. The preset distance used in this embodiment is 10cm. In this way, the mobile end 122 of the displacement meter can effectively contact the cable clamp end face 115, and the relative displacement data of the cable clamp end face 115 relative to the main cable 100 can be monitored within the effective travel of the displacement meter 120, and the displacement value of the cable clamp 110 sliding on the main cable 100 is collected at a sampling frequency of once a minute.

[0074] As a preferred embodiment of the present invention, the number of the thermometers 130 is no less than 4. The thermometers 130 are provided to eliminate the influence of temperature on the slip value. Since different temperatures will have a more obvious influence on the structure of an object, such as the expansion coefficient, the displacement data measured by the displacement meter 120 needs to be temperature corrected, and the temperature value of the main cable 100 near the cable clamp 110 is not uniform. For example, the greater the load, the greater the static friction will be, and the corresponding internal energy will increase the temperature. Therefore, it is necessary to evenly arrange multiple thermometers 130 around the main cable 100 near the cable clamp 110. The final temperature is the average temperature value of the same cross-section where the multiple thermometers 130 are located. Thereby improving the accuracy of the final monitored slip value. Based on this, the arrangement of the number of thermometers 130 needs to be reasonable. If there are too few, it will lead to large errors, and the accuracy of the final monitoring slip value of the cable clamp 110 will also be low. Please refer again. Figure 4 In this embodiment, the number of the thermometers 130 is 8, which are evenly arranged around the main cable 100.

[0075] Furthermore, the displacement meter 120 is one or more of a fiber Bragg grating displacement meter, a resistance strain displacement meter, a pull-rope displacement meter, and a magnetostrictive displacement meter. Specifically, the displacement meter is a contact sensor, and the displacement meter 120 used in this embodiment is one or more of the fiber Bragg grating displacement meter, resistance strain displacement meter, pull-rope displacement meter, and magnetostrictive displacement meter commonly found on the market. As long as any of these displacement meters 120 can measure the sliding displacement value of the cable clamp 110 along the direction of the main cable lower end 102 within the effective stroke, it can be used as the displacement meter 120 of this embodiment.

[0076] As a preferred embodiment of the present invention, the measurement accuracy of the displacement meter 120 is not less than 0.1mm. It should be noted that the automatic online monitoring device for cable clamp slippage has high requirements for data measurement accuracy. Too low accuracy can easily lead to large errors in the final result after algorithm correction. At the same time, the slippage of the cable clamp 110 has a very large impact on the safety of the suspension bridge. High accuracy can allow us to detect small slip changes in advance to take corresponding measures. In addition, the displacement meter 120 is sampled at a certain sampling frequency. If the accuracy is too low, there will be no obvious distinction between the cable clamp slippage values ​​collected between adjacent sampling frequencies, so that effective and comprehensive analysis cannot be performed. Therefore, the measurement accuracy of the selected displacement meter 120 is not less than 0.1mm.

[0077] Further, the thermometer 130 is one or more of a fiber Bragg grating type, a platinum sensitive resistor type, and an infrared thermometer 130. Specifically, the thermometer 130 used in this embodiment is one or more of the commonly used fiber Bragg grating type, platinum sensitive resistor type, and infrared thermometer 130 on the market. As long as any of these thermometers 130 can measure the structural temperature near the cable clamp 110, it can be used as the thermometer 130 of this embodiment.

[0078] As a preferred embodiment of the present invention, the measurement accuracy of the thermometer 130 is not less than 0.5°C. It should be clear that the automatic online monitoring device for cable clamp slippage has high requirements for data measurement accuracy. Too low accuracy can easily lead to large errors in the final result after algorithm correction. At the same time, the slippage of the cable clamp 110 has a very large impact on the safety of the suspension bridge. High accuracy can allow us to detect small slip changes in advance to take corresponding measures. In addition, the thermometer 130 is sampled at a certain sampling frequency. If the accuracy is too low, there will be no obvious distinction between the cable clamp slippage values ​​collected between adjacent sampling frequencies, so that effective and comprehensive analysis cannot be performed. Therefore, the measurement accuracy of the selected thermometer 130 is not less than 0.1mm.

[0079] Furthermore, the cable clamp 110 is connected to the main cable 100 by a high-strength bolt 113. Common cable clamps 110 are of left and right halves and upper and lower halves. This embodiment adopts a left and right halves. The left half 111 and the right half 112 of the cable clamp are fixedly installed at a specific position of the main cable 100 by high-strength bolts 113, so that the inner wall 114 of the cable clamp exerts pressure on the main cable 100 of the suspension bridge to prevent the cable clamp 110 from sliding along the lower end 102 of the main cable of the suspension bridge. The type, model and quantity of bolts can be used according to actual needs, but it is necessary to ensure that the pressure exerted by the cable clamp 110 on the main cable 100 after installation meets the requirements of industry standards. In this embodiment, the number of high-strength bolts 113 is 10.

[0080] See also Figure 5 The present invention provides an automated online monitoring system for cable clamp slippage, including the automated online monitoring device for cable clamp slippage described above, and also including a data gateway 140 that is communicatively connected to the thermometer 130 and the displacement meter 120, and a background server 150 that is connected to the data gateway 140 via a wired or wireless connection. The background server 150 processes and stores the monitored data accordingly, and sends the results to the Internet. Customers can view the results and take corresponding measures through a mobile terminal 160 or a computer terminal 170. If the monitoring data exceeds a preset threshold, the background server 150 can automatically alarm through sound and light or by sending information, thereby realizing automated online monitoring of cable clamp slippage.

[0081] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An automated online monitoring method for cable clamp slippage, characterized in that: The method comprises the steps of: sampling displacement data of the cable clamp relative to the main cable collected by the displacement meter according to a preset sampling frequency, wherein the displacement meter is fixedly mounted on the main cable above the cable clamp and is separated from the cable clamp by a preset distance, and the mobile end of the displacement meter is fixed on the cable clamp; Sampling the temperature data collected by the thermometer according to a preset sampling frequency, wherein a plurality of thermometers are respectively arranged around the main cable and close to the cable clamp; Acquire an average temperature vector T of the temperature of the same cross section of the main cable according to the temperature data, and acquire a displacement monitoring vector X of the cable clamp relative to the main cable according to the displacement data; According to the linear correlation equation between the average temperature vector and the displacement monitoring vector: Y=X-(KT-A), the corrected cable clamp slip value is obtained; where Y is the corrected cable clamp slip vector, K and A are the correlation fitting constants between temperature and displacement; Also includes the steps: According to whether the cable clamp slippage value satisfies the preset threshold value for 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold value, it is judged whether the cable clamp slippage value satisfies the automatic alarm triggering condition; When the cable clamp slippage value is greater than the preset threshold value for 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold value, it is determined that the automatic alarm triggering condition is met and the preset automatic alarm instruction is executed; When the cable clamp slippage value is not greater than the preset threshold for 10 consecutive times and / or the average value within 10 minutes is greater than the preset threshold, the automatic alarm triggering condition is not met and the current state is maintained.

2. The automatic online monitoring method for cable clamp slippage according to claim 1 is characterized in that: The preset distance is 5-15 cm.

3. The automatic online monitoring method for cable clamp slippage according to claim 1 is characterized in that: The number of the thermometers is no less than 4, and the thermometers are evenly distributed around the main cable.

4. The automatic online monitoring method for cable clamp slippage according to claim 1 is characterized in that: The preset sampling frequency is once per minute.

5. The automatic online monitoring method for cable clamp slippage according to claim 1 is characterized in that: The method also includes the step of performing algorithm correction on the collected displacement data and temperature data.

6. The automatic online monitoring method for cable clamp slippage according to claim 1 is characterized in that: The preset threshold is no greater than 10 mm.

7. The automatic online monitoring method for cable clamp slippage according to claim 1 is characterized in that: The displacement meter is one or more of a fiber Bragg grating displacement meter, a resistance strain displacement meter, a pull-rope displacement meter, and a magnetostrictive displacement meter, and the measurement accuracy of the displacement meter is not less than 0.1 mm; the thermometer is one or more of a fiber Bragg grating type, a platinum resistor type, and an infrared thermometer, and the measurement accuracy of the thermometer is not less than 0.5°C.

8. An automated online monitoring system for cable clamp slippage, comprising an automated online monitoring device for cable clamp slippage and a control system, wherein the control system comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: The automatic online monitoring device for cable clamp slippage includes at least one displacement meter arranged on the main cable above the cable clamp and separated from the cable clamp by a preset distance, and a plurality of thermometers evenly arranged around the main cable and close to the cable clamp, wherein the mobile end of the displacement meter is fixed on the cable clamp; when the processor executes the computer program, the steps of the automatic online monitoring method for cable clamp slippage as described in any one of claims 1 to 7 are implemented.

9. A readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for automatic online monitoring of cable clamp slippage according to any one of claims 1 to 7 are implemented.

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