Anchor cable failure state circuit monitoring device

Abstract

The invention discloses an anchor cable failure state circuit monitoring device, and belongs to the technical field of geotechnical engineering.The anchor cable failure state circuit monitoring device comprises an embedded circuit and a signal monitoring system, the embedded circuit comprises a shell, a signal transmission point, a magnetic fixing point, an input line and an output line, and the shape of the shell is set according to the shape of an anchor cable to be detected; the shell is arranged on the outer side of the anchor cable to be detected, an opening is formed in the position, at a concrete pier pad of the anchor cable to be detected, of the shell, the input line penetrates through the opening to be connected with the shell, and the output line penetrates through the opening to be connected with the end, exposed out of the earth surface, of the anchor cable. According to the anchor cable failure state circuit monitoring device, input and output detection signals are compared, the evolution law of the detection signals along with time is described, information can be obtained in time before anchor cable failure, and the types of most anchor cable failure conditions can be obtained through the device.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, and in particular to a circuit monitoring device for an anchor cable failure state. Background Art

[0002] Most highways and railways pass through complex mountainous areas such as mountains and slopes. Therefore, prestressed anchor cables have gradually begun to be used in my country since the 1960s.

[0003] However, the actual operating status of prestressed anchor cables and the research on structural health monitoring technology lag far behind the engineering application of anchor cables. The stress state of anchor cables in rock and soil and the environment in which they are located are relatively complex and harsh, facing problems such as grouting hole quality, anchor cable relaxation, corrosion, rock and soil settlement, freeze-thaw cycles, earthquakes, etc. These unpredictable problems will cause unpredictable damage to the structure of the anchor cable. In the face of long-term and complex working conditions, it is particularly important to master the construction quality of anchor cables and the operating status of the service process.

[0004] Therefore, it is urgent to adopt effective and feasible monitoring methods to conduct necessary monitoring of different bonding positions of anchor cables during the construction process and operation status, grasp the real-time status of anchor cables, and promptly discover the healthy operation problems of anchor cables. At present, the main methods used in stress monitoring in prestressed anchoring systems are: force ring method, magnetic flux method, vibration frequency method, vibrating string method, etc. Most of these methods have problems such as being unable to monitor and feedback the internal conditions of the anchor cables, large errors, etc., and can only know whether the anchor cables have failed, but cannot determine the specific information of the failure. Summary of the invention

[0005] The object of the present invention is to provide a circuit monitoring device for an anchor cable failure state to solve the problems mentioned in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides a circuit monitoring device for the failure status of an anchor cable, including an embedded circuit and a signal monitoring system, wherein the embedded circuit includes an outer shell, a signal transmission point, a magnetic fixing point, an input line and an output line, the shape of the outer shell is set according to the shape of the anchor cable to be tested, and the outer shell is adsorbed on the outside of the anchor cable to be tested, the outer shell is provided with an opening at the concrete pier pad of the anchor cable to be tested, the input line passes through the opening to be connected to the outer shell, and the output line passes through the opening to be connected to the end of the anchor cable exposed to the surface.

[0007] Preferably, the side of the housing contacting the anchor cable is covered with insulating material.

[0008] Preferably, the signal transmission point and the magnetic fixing point are both arranged on one side of the shell, and the signal transmission point passes through the shell.

[0009] Preferably, the signal transmission point is made of a material with excellent conductive properties, and the signal transmission point is insulated and connected to the shell. The number of the signal transmission points and the input lines is set to be several, and each of the signal transmission points is connected to one input line respectively.

[0010] Preferably, the signal monitoring system comprises a signal generator, a signal modulator, a signal demodulator and a signal processing module, the output end of the signal generator is connected to the input end of the signal modulator, and the output end of the signal demodulator is connected to the signal processing module.

[0011] Preferably, each monitoring signal source output by the signal modulator is connected to the signal transmission point via the input line, and the signal demodulator is connected to the end of the anchor cable exposed to the surface via the output line.

[0012] Preferably, each detection signal source emitted by the signal generator is modulated by the signal modulation 202 using an orthogonal carrier wave, and the carrier wave n is Then, each detection signal is combined and transmitted through the embedded circuit and anchor cable. The signal information flow is:

[0013]

[0014] Among them, d i is the amplitude of the modulating signal, f i is the corresponding frequency;

[0015] The anchor cable surface end receives the detection signal, and demodulates the combined data stream using an orthogonal carrier through the signal demodulator. The orthogonal carrier is Then it is input to the signal processing module for analysis.

[0016] Therefore, the present invention adopts the above-mentioned anchor cable failure state circuit monitoring device, which has the following beneficial effects:

[0017] (1) The present invention embeds the circuit and adsorbs it on the outside of the anchor cable, without changing the shape of the existing anchor cable or the construction method. Only the detection device needs to be added to complete the monitoring, which effectively reduces the increase in the anchor cable construction cost caused by monitoring;

[0018] (2) The present invention can complete monitoring by inputting detection signals and receiving surface end signals for processing. The anchor cable status is detected by using changes in the amplitude or frequency of the detection signals. Continuous monitoring can be performed throughout the day. The input monitoring signal consumes little energy, the total monitoring power is low, and the detection cost is effectively reduced.

[0019] (3) The present invention actively obtains the state of the anchor cable through monitoring signals, not only obtaining failure information after the anchor cable fails, but also obtaining the change of the anchor cable state through detection signals when the anchor cable undergoes physical changes such as deformation and necking due to tensile pressure, which is conducive to obtaining early warning before the anchor cable expires, preparing in advance, taking preventive measures, and avoiding the occurrence of geological disasters;

[0020] (4) The present invention sets multiple sets of monitoring circuits at different positions of the anchor cable, so as to obtain the approximate location where the anchor cable fails or changes, as well as most of the failure type information, which is conducive to the effective implementation of anchor cable maintenance and repair work.

[0021] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a circuit monitoring device for failure state of an anchor cable according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the assembly of an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of orthogonal frequency division multiplexing of detection signals according to an embodiment of the present invention;

[0025] Figure 4 4-1 is a schematic diagram of the waveform of a single monitoring signal source, 4-2 is a schematic diagram of the superposition of multiple monitoring signal sources, 4-3 is a waveform diagram of the monitoring signal received at point n within a certain period of time, 4-4 is a waveform diagram received at point n at the next moment, 4-5 is a waveform diagram of the monitoring signal received at point n, and 4-6 is a waveform diagram of the monitoring signal received at point n+1;

[0026] Reference numerals

[0027] 101. Shell; 102. Signal transmission point; 103. Magnetic fixing point; 104. Input line; 105. Output line; 201. Signal generator; 202. Signal modulator; 203. Signal demodulator; 204. Signal processing module. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] Example

[0031] like Figure 1 As shown, the present invention provides a circuit monitoring device for the failure state of an anchor cable, including an embedded circuit and a signal monitoring system. The embedded circuit includes a shell 101, a signal transmission point 102, a magnetic fixing point 103, a plurality of input lines 104 and an output line 105. The shape of the shell 101 is set according to the shape of the anchor cable to be tested, and the shell 101 is adsorbed on the outside of the anchor cable to be tested. The side of the shell 101 that contacts the anchor cable is covered with an insulating material, which can prevent the monitoring signal from being transmitted through the shell 101. The shell 101 is provided with an opening at the concrete pier pad of the anchor cable to be tested, which is connected to the outside world and connected to the input line 104. The output line 105 is connected to the end of the anchor cable exposed on the ground. The input line 104 passes through the opening to be connected to the shell, and the output line 105 passes through the opening to be connected to the end of the anchor cable to be tested exposed on the ground.

[0032] The signal transmission point 102 and the magnetic fixing point 103 are both arranged on one side of the shell 101, and the signal transmission point 102 passes through the shell 101. The signal transmission point 102 is made of a material with excellent conductive properties, and the signal transmission point 102 and the shell 101 are insulated and connected. The number of signal transmission points 102 and input lines 104 is set to be several, and each signal transmission point 102 is connected to one input line 104 respectively.

[0033] The signal monitoring system includes a signal generator 201, a signal modulator 202, a signal demodulator 203 and a signal processing module 204. The output end of the signal generator 201 is connected to the input end of the signal modulator 202, and the output end of the signal demodulator 203 is connected to the signal processing module 204. The output end of the signal modulator 202 is connected to the signal transmission point 102 through the input line 104. The signal modulator 202 is connected to the housing 101 through the input line 104, and the input end of the signal demodulator 203 is connected to the exposed surface end of the anchor cable to be tested through the output line 105.

[0034] Each input signal is modulated by the signal modulator 202 and input to the embedded circuit. The output line 105 passes through the signal demodulator 203 to decompose the received signal into signals corresponding to the input signal. The output signal enters the signal processing module 204, and the anchor cable status information is obtained based on the time-varying law of each signal and the comparison of different signals at the same time.

[0035] like Figure 2 As shown, each monitoring signal source output by the signal modulator 202 is connected to the corresponding signal transmission point 102 in the embedded circuit, the housing 101 is adsorbed on the outside of the anchor cable, and then the prestressed anchor cable is set normally.

[0036] like Figure 3 As shown, each detection signal source emitted by the signal generator 201 is modulated by an orthogonal carrier through the signal modulator 202, and the carrier n is Then, each detection signal is combined and transmitted through the embedded circuit and anchor cable. The signal information flow is:

[0037]

[0038] Among them, d i is the amplitude of the modulating signal, f i is the corresponding frequency.

[0039] The anchor cable surface end receives the detection signal and demodulates the combined data stream using an orthogonal carrier through a signal demodulator 203. The orthogonal carrier is Then it is input to the signal processing module 204 for analysis. Since the carriers are orthogonal to each other, after the received total detection signal is processed by the orthogonal carrier, the product of carrier n and the orthogonal carrier is 1, and the product of other carriers and the orthogonal carrier is 0. Therefore, after demodulation, only the signal d corresponding to carrier n is n By analyzing the information of different monitoring signal sources at the same time, the status information of each point in the anchor cable at a certain time can be obtained; by analyzing the information of different monitoring signal sources at the same time, the status change of a certain point of the anchor cable can be obtained.

[0040] Reference Figure 4-1 and Figure 4-2It can be seen that each detection signal interferes with each other, so signal multiplexing technology must be used to distinguish each monitoring signal.

[0041] Example usage:

[0042] 1. As Figure 4-3 and Figure 4-4 As shown in the figure, the amplitude of the detection signal decreases. It can be inferred that this is due to the deformation of the anchor cable. The anchor cable is necked due to tension at a certain point below point n, and the cross-sectional area of ​​the anchor cable decreases, which increases the resistance.

[0043] 2. If Figure 4 -5 and Figure 4 -6, it can be inferred that the anchor cable breaks and fails at a position between points n and n+1 (a signal transmission point 102 is set at the front section of the shell 101 to simultaneously monitor whether the anchor cable has an overall displacement).

[0044] Therefore, the present invention adopts the above-mentioned anchor cable failure status circuit monitoring device, which can input the modulated monitoring signal to different positions of the anchor cable, and receive and process the monitoring signal at the ground section of the anchor cable; by comparing the input and output detection signals, and describing the evolution law of the detection signal over time, information can be obtained in time before the anchor cable fails, and the types of most anchor cable failure situations can be obtained through this device; for the anchor cable breakage failure situation, this device can roughly confirm the breakage position, which is helpful to take more appropriate countermeasures.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An anchor cable failure status circuit monitoring device, characterized in that: It includes an embedded circuit and a signal monitoring system. The embedded circuit includes a shell, a signal transmission point, a magnetic fixing point, an input line and an output line. The shape of the shell is set according to the shape of the anchor cable to be tested, and the shell is adsorbed on the outside of the anchor cable to be tested. The shell is provided with an opening at the concrete pier pad of the anchor cable to be tested. The input line passes through the opening to be connected to the shell, and the output line passes through the opening to be connected to the end of the anchor cable exposed to the surface.

2. The device for monitoring the failure state of an anchor cable according to claim 1, characterized in that: The side of the housing contacting the anchor cable is covered with an insulating material.

3. The device for monitoring the failure state of an anchor cable according to claim 1, characterized in that: The signal transmission point and the magnetic fixing point are both arranged on one side of the shell, and the signal transmission point passes through the shell.

4. The device for monitoring the failure state of an anchor cable according to claim 3, characterized in that: The signal transmission point is made of a material with excellent conductive properties, and the signal transmission point is insulated and connected to the shell. The number of the signal transmission points and the input lines is set to be several, and each of the signal transmission points is connected to one input line respectively.

5. The device for monitoring the failure state of an anchor cable according to claim 4, characterized in that: The signal monitoring system comprises a signal generator, a signal modulator, a signal demodulator and a signal processing module. The output end of the signal generator is connected to the input end of the signal modulator, and the output end of the signal demodulator is connected to the signal processing module.

6. The device for monitoring the failure state of an anchor cable according to claim 5, characterized in that: Each monitoring signal source output by the signal modulator is connected to the signal transmission point through the input line, and the signal demodulator is connected to the end of the anchor cable exposed to the ground surface through the output line.

7. The device for monitoring the failure state of an anchor cable according to claim 6, characterized in that: Each detection signal source emitted by the signal generator is modulated by the signal modulation 202 using an orthogonal carrier wave, and the carrier wave n is Then, each detection signal is combined and transmitted through the embedded circuit and anchor cable. The signal information flow is: Among them, d i is the amplitude of the modulating signal, f i is the corresponding frequency; The anchor cable surface end receives the detection signal, and demodulates the combined data stream using an orthogonal carrier through the signal demodulator. The orthogonal carrier is Then it is input to the signal processing module for analysis.

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