CN116839670A - Multi-channel state monitoring and stray current data acquisition device for land long-distance pipeline - Google Patents
Multi-channel state monitoring and stray current data acquisition device for land long-distance pipeline Download PDFInfo
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Abstract
The land long-distance pipeline multichannel state monitoring and stray current data acquisition device comprises a state monitoring module, a stray current data acquisition module, a data transmission module and an audible and visual alarm module; the state monitoring module is used for collecting stress strain, vibration speed and acceleration of the long-distance pipeline body; the stray current data acquisition module is used for alternating current density, power-on potential, power-off potential, alternating current voltage, alternating current and direct current values of the pipeline; the data transmission module is connected with the stray current data acquisition module and the state monitoring module and is used for transmitting acquired data to the data platform; the audible and visual alarm module is connected with the state monitoring module, and on-line early warning is realized according to a preset alarm threshold value and real-time monitoring data. The integrated monitoring device for the key parameters of the eight-class pipeline has the beneficial effects of integrating settlement monitoring, displacement monitoring, vibration speed, vibration acceleration, stress strain, temperature and rainfall, and has the functions of real-time data analysis and super-threshold intelligent alarm.
Description
Technical Field
The invention relates to the field of land long-distance pipeline multichannel state monitoring and stray current data acquisition, in particular to a land long-distance pipeline multichannel state monitoring and stray current data acquisition device.
Background
Three major problems exist in the construction process of the existing long-distance pipeline facing the third party:
1. the influence of tunnel blasting construction on peripheral laid pipelines lacks an evaluation standard and a prediction model;
2. the pile type construction process of hammering piles, bored piles and the like lacks comprehensive monitoring means and evaluation indexes which are specially aimed at vibration and strain of pipelines;
3. aiming at the condition that the current situation pipeline stray current interference evaluation seriously depends on imported equipment UDL2, and the UDL2 cannot be remotely transmitted and cannot be monitored for a long period, the common intelligent potential acquisition pile is required to be excavated and re-welded, and the long-acting reference is unstable.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a land long-distance pipeline multichannel state monitoring and stray current data acquisition device.
The aim of the invention is achieved by the following technical scheme.
Multi-channel state monitoring and stray current data acquisition device for land long-distance pipeline comprises:
the submodule of the state monitoring module comprises a vibrating wire acquisition terminal, a vibrating wire sensor and a magnetoelectric sensor, wherein the vibrating wire sensor detects and acquires a frequency signal through the vibrating wire sensor, performs analog-to-digital conversion of sensor frequency and temperature physical quantity, and the magnetoelectric sensor is used for acquiring a speed acceleration signal;
the submodule of the audible and visual alarm module comprises a threshold setting CPU and an audible and visual alarm, the threshold setting CPU is connected with the state monitoring module, and when the CPU processing data find that the threshold exceeds a set threshold value, a command is sent to make the audible and visual alarm sound and the alarm lamp light;
the sub-modules of the stray current data acquisition module include,
the data acquisition submodule is used for measuring the alternating current density, the power-on potential, the power-off potential, the alternating current voltage, the alternating current and the direct current values of the pipeline;
the remote positioning sub-module is used for obtaining the self position of the equipment;
the USB communication sub-module is used for realizing the USB communication function of the equipment;
the power supply module is connected with the state monitoring module and the stray current data acquisition module and is used for power supply switching and energy control;
the data transmission module is connected with the state monitoring module, the audible and visual alarm module and the stray current data acquisition module and is used for transmitting acquired data to a data center;
the data center is connected with the data transmission module to realize the storage interaction of data.
The data acquisition submodule adopts an analog-to-digital converter chip to acquire analog data such as voltage, current and potential, the analog-to-digital converter chip is connected with a circuit to be tested through two precision instrument amplifiers to respectively realize the potential of a test piece under the condition of power on and power off, a bidirectional current detection amplifying chip and a relay are arranged on the circuit to be tested to monitor and acquire the direct current and alternating current data, and a control chip is arranged on the precision instrument amplifier at a detection power on point to configure the amplification factor of an amplifier for acquiring the power on potential under the power on state; and a measuring chip is arranged on a circuit connected with each precision instrument amplifier and the analog-to-digital converter chip to convert alternating voltage into equivalent direct voltage for measurement.
The data acquisition sub-module is provided with a flash memory chip which is connected with the singlechip through an SPI mode for local data storage, and the singlechip reserves a serial port and is connected with the data transmission module.
The USB communication sub-module is provided with a key detection and a comparator chip with a precise reference, when the USB interface is not connected, whether a switch key is pressed down is monitored, whether the internal working state of the equipment needs to be changed is judged, and when the USB interface is connected with external equipment, the key detection function is temporarily closed through a set relay.
The data transmission module comprises an integrated antenna and an intelligent data terminal, and is connected with the intelligent data terminal through the integrated antenna to conduct data remote transmission.
Two end points of a K signal point position, an RL1 load point position and a test point position TP13 are arranged on the circuit to be tested, two supporting legs of the precision instrument amplifier U14 are respectively connected with the K signal point position and the RL1 load point position at one end, and two supporting legs of the precision instrument amplifier U11 are respectively connected with the K signal point position and the test point position TP13 at the other end.
The data acquisition submodule adopts a test piece method to acquire potential, two ends of a K signal point position are connected with a test piece, a test point position TP13 is connected with a measured pipeline or a structure, a RL1 load point position is connected with a reference electrode, the potential difference between the test piece and the reference electrode after partial pressure reduction is detected through a precision instrument amplifier U14, the detection voltage of the precision instrument amplifier U11 is the potential difference between the test piece and the pipeline, an analog-digital converter chip acquires and transmits the acquired data to a singlechip for data processing through conversion, so that data such as voltage and current between the pipeline and the reference are obtained, the pipeline polarization condition is obtained, and the current pipeline cathode protection effect is judged.
The data acquisition submodule adopts a double-potential method to acquire potential, two ends of a K signal point are connected with a reference electrode end, a test point TP13 is connected with a second channel potential test point, a RL1 load point is connected with a first channel potential test point, a precision instrument amplifier U14 detects the differential pressure between the reference electrode after reduction multiple and the first test point, a precision instrument amplifier U11 detects the differential pressure between the reference electrode and the second test point, and an analog-digital converter chip acquires and transmits the differential pressure to a singlechip for data processing through conversion to obtain the differential pressure at two ends of a measured length pipeline.
The blasting vibration speed prediction model arranged in the land long-distance pipeline multichannel state monitoring and stray current data acquisition device is specifically,
wherein V is particle vibration speed, and the unit is cm/s; q is the single-sound dosage, and the unit is kg; r is the distance from the particle to the explosion center of the explosive, and the unit is m.
The beneficial effects of the invention are as follows:
1. the device can be used in a safety evaluation method and a safety evaluation flow for the influence of tunnel blasting construction on the vibration of the peripheral pipeline;
2. a prediction model of the influence of the tunnel blasting construction process on the vibration of the peripheral pipeline is arranged in the device, so that a monitoring function is realized;
3. the device is an integrated monitoring device integrating key parameters of eight pipelines, including settlement monitoring, displacement monitoring, vibration speed, vibration acceleration, stress strain, temperature and rainfall, and has the functions of real-time data analysis, super-threshold intelligent alarm and the like;
4. the device can be used in a safety evaluation method for the influence of pile foundation construction on the state of an in-service long-distance pipeline body;
5. the circuit structure of the device is a cathode protection intelligent data acquisition structure, and has the functions of real-time transmission, remote monitoring, stray current interference assessment and long-period data acquisition.
Drawings
FIG. 1 is a schematic diagram of a land long-distance pipeline multichannel state monitoring and stray current data acquisition device;
FIG. 2 is a flow chart of vibratory string signal acquisition;
FIG. 3 is a flow chart of velocity acceleration signal acquisition;
FIG. 4 is a circuit diagram of a data acquisition submodule;
FIG. 5 is a schematic diagram of a data storage circuit of the data acquisition submodule;
FIG. 6 is a circuit diagram of a remotely located sub-module;
FIG. 7 is a circuit design diagram of a USB communication submodule;
FIG. 8 is a circuit design diagram of a power supply sub-module;
FIG. 9 is a schematic diagram of a test strip voltage measurement circuit;
fig. 10 is a circuit diagram of a dual potentiometric voltage measurement.
Detailed Description
The technical scheme of the invention is further described by specific examples.
Example 1
As shown in FIG. 1, the system comprises a state monitoring module, a stray current data acquisition module, a data transmission module, an audible and visual alarm module, a data center, a power supply module, a vibrating wire acquisition terminal, a vibrating wire sensor, a magneto-electric sensor, a data acquisition sub-module, a USB communication sub-module, a remote positioning sub-module, a threshold setting CPU, an audible and visual alarm, an integrated antenna and an intelligent data terminal. Wherein, the integration antenna adopts 4G+GPS integration antenna, and intelligent data terminal adopts RTU intelligent data terminal.
The state monitoring module collects data of three sensors through a vibrating wire collecting terminal, a vibrating wire sensor and a magneto-electric sensor; the audible and visual alarm module generates an alarm signal through a threshold setting CPU and an audible and visual alarm; the power supply module is connected with the state monitoring module and the stray current data acquisition module and is used for supplying power required by work; the stray current data acquisition module acquires data through the data acquisition sub-module, the USB communication sub-module performs communication transmission, and the remote positioning sub-module positions the device; the data transmission module is connected with the intelligent data terminal through the integrated antenna, so that data remote transmission is realized.
In the embodiment, a vibration wire acquisition terminal in the state monitoring module adopts a multichannel vibration wire and temperature sensing signal acquisition instrument, 8-path vibration wire acquisition and 8-path temperature acquisition are supported, meanwhile, 1-path adjustable power supply output can supply power for other sensors, 16-path DAC output is programmed, and an output voltage value is adjusted according to the measured vibration wire sensor frequency value. The vibrating wire acquisition terminal is provided with an RS485@MODBUS standard industrial communication protocol, the communication speed is 1.2-256 kbps, and the vibrating wire acquisition terminal is communicated with other measurement and control system equipment.
The vibrating wire acquisition terminal has the functions of excitation, signal detection, data processing, quality evaluation and the like of the vibrating wire sensor, performs analog-to-digital conversion of sensor frequency and temperature physical quantity, and realizes data interaction through a digital interface RS 485. The vibrating wire sensor is a resonant sensor taking a tensioned metal steel wire as a sensitive element, after the length of the wire is determined, the change of the natural vibration frequency of the wire can represent the tension of the wire, the vibrating wire sensor needs an excitation signal to work, self-vibration can be generated after the vibrating wire sensor receives the proper excitation signal, and a frequency signal can be output only after the vibrating wire sensor generates the self-vibration, and further, a vibrating wire acquisition terminal reading circuit can detect and read the self-vibration signal of the vibrating wire sensor, so that a vibration frequency value can be obtained through calculation. The magneto-electric sensor converts the measured signals including speed, acceleration, displacement, etc. into electric signals by magneto-electric action, and converts the input motion speed into induced electromotive force by using the electromagnetic induction principle to output.
In the state monitoring module, the vibration wire signal acquisition flow is shown in fig. 2, firstly, an excitation signal of a vibration wire sensor is sent out by a vibration wire acquisition terminal, when the vibration wire sensor receives the excitation signal, self vibration is generated, only when the vibration wire sensor self-vibrates, a frequency signal can be generated, then the frequency signal is detected and read by a reading circuit of the vibration wire acquisition terminal, a vibration frequency value is obtained through calculation and analysis, then a voltage signal in direct proportion to the vibration wire frequency value is output, and the voltage signal is uploaded to the data transmission module through an RS485 bus.
The speed/acceleration signal acquisition flow in the state monitoring module is shown in fig. 3, the magnetoelectric sensor starts to work, the speed/acceleration analog signal is converted into an electric signal, the electric signal is connected to an ADC channel of the RTU data acquisition terminal through a connecting wire, the acquired voltage signal is processed by an ADC chip of the RTU data acquisition terminal, the data is uploaded to the threshold setting CPU through an SPI bus for processing and threshold judgment, and when the data is normal, the data is uploaded to the data center through a 4G module of the RTU data acquisition terminal for monitoring. And when the threshold value is exceeded, sending a command to output an alarm, and starting the audible and visual alarm.
The working flow of the audible and visual alarm module is as follows: when the audible and visual alarm judges that the threshold value exceeds the set threshold value according to the data processing result of the threshold value setting CPU, the RTU intelligent data terminal sends out a command to make the audible and visual alarm sound and the alarm lamp light.
The circuit structure of a data acquisition sub-module in the stray current data acquisition module is shown in fig. 4, a multiplexing analog-to-digital converter chip with the model number of AD7794 is selected as the analog-to-digital converter chip, the acquisition of analog quantity data such as voltage, current and potential is carried out, a bidirectional current detection amplifying chip with the model number of LTC1966 is adopted, the data of direct current and alternating current are monitored and acquired by matching with an IM41GR relay, 2 low-power consumption precision instrument amplifiers with the model number of AD620 are used for respectively realizing the potential of a test piece under the condition of power on and power off, and a control chip with the model number of NC7W is selected for configuring the amplification factor of an amplifier for acquiring the power on potential under the power on state, so that the circuit is more flexible; a measuring chip with the model of LTC1966 is selected to be responsible for converting alternating voltage into equivalent direct voltage for measurement.
The structure of a storage circuit after the data acquisition of the data acquisition submodule in the stray current data acquisition module is completed is shown in fig. 5, a flash memory chip with the model of W25Q32 is connected with a singlechip in an SPI mode to store local data, and a serial port is reserved through the singlechip to communicate with a 4G+GPS integrated antenna module.
The circuit design of the remote positioning sub-module in the stray current data acquisition module is shown in fig. 6, and a low-power-consumption GNSS positioning chip with the model number of MAX-8Q is adopted to acquire the self position of the equipment, and the remote positioning sub-module is matched with a front-end amplifying chip for use, so that the positioning chip has better signals and lower noise interference.
The circuit structure of the USB communication sub-module in the stray current data acquisition module is shown in fig. 7, a USB-to-serial port chip with the model FT230 is adopted to realize the USB communication function of the device, key detection is arranged in the circuit, a comparator chip with the model AD820 and a precise reference is used, whether a switch key is pressed down or not is monitored when a USB interface is not connected, whether the internal working state of the device is required to be changed is judged, and when the USB interface is connected with external equipment, the key detection function is temporarily closed due to the existence of an IM03GR relay.
The circuit structure of the power supply module is shown in fig. 8, and the BQ24072RGTR chip is used for power conversion, and simultaneously supports USB5V power supply input and 3.7V battery power supply input, so that the battery can be charged through the USB power supply, the temperature of the battery is monitored through an NTC resistor during charging, the working temperature of the battery is ensured to be normal, the output level of the chip conversion is Vbat+225mV, and the power supply is converted through primary power supply again to obtain 3.3V power supply, 2.8V power supply and 1.25V power supply for all partial equipment circuits.
Example two
On the basis of the first embodiment, the data acquisition sub-module in the stray current data acquisition module acquires potential data in a test piece method.
As shown in FIG. 9, the K signal point is connected with a test piece, the TP13 point is connected with a pipeline or a structure, the RL1 point is connected with a reference electrode, the relay is in an ON state, the voltages at the two ends of pins 1 and 3 of U14 are reduced by a certain multiple, the voltages at the two ends of pins 2 and 3 of U11 are the voltage difference between the test piece and the pipeline, the output data of U14 and U11 are collected by an AD collecting chip and are transmitted to a singlechip for data processing through conversion, the actual voltage difference between the current pipeline and the reference electrode can be calculated correspondingly, and then the pipeline polarization degree is obtained, and the cathodic protection effect is judged. The voltage difference between the test piece obtained by the U11 and the pipeline can be used for calculating the current in the electrolyte between the test piece and the metal pipeline, and the current direction of the pipeline in the polarized state is disappeared or reversed under the condition of cathode protection failure.
Example III
On the basis of the first embodiment, a data acquisition submodule in the stray current data acquisition module acquires potential data by adopting a double-potential method.
As shown in fig. 10, the K signal point is connected to a reference terminal, typically a reference electrode, the RL1 point is connected to a potential test point of the first channel, a connecting pipe or structure, and the TP13 point is connected to a potential test point of the second channel, a connecting pipe or structure. At this time, the relay is in an OFF state, the voltages at the two ends of the 1-pin and the 3-pin of the U14 are the differential pressure between the reference electrode and the first test point after a certain multiple reduction, and the voltages at the two ends of the 2-pin and the 3-pin of the U11 are the differential pressure between the measured reference electrode and the second test point. The output data quantity of the U13 and the U11 is collected by the AD collecting chip and is converted and transmitted to the singlechip for data processing, and the voltage difference between two ends of a pipeline with a certain length can be obtained through calculation.
Example IV
High-frequency seismic waves generated in the construction process of tunnel blasting construction, pile hammering, bored pile and other pile foundations act on the existing pipeline, and great tensile stress or compressive stress is generated on the straight pipe section, so that the pipeline is deformed and even damaged and fails; in the adjacent pipe sections, the tensile stress or the compressive stress received by the different distances from the seismic source are different, so that the pipeline generates bending deformation under the action of two forces; at the joint of the pipelines (welding seam), the welding seam generates axial strain under the action of the same force due to the different materials of the welding seam, the heat affected zone and the parent metal.
Aiming at tunnel blasting construction, the vibration speed of earthquake waves generated during tunnel blasting construction is obtained as a main evaluation index, the acceptable vibration threshold value of a pipeline is 2cm/s, and a blasting vibration speed prediction model is obtained through regression analysis and concretely comprises the following steps:
wherein: v is particle vibration speed, cm/s; q is a single-shot explosive (total explosive charge in blasting of the blasting cap and maximum explosive charge in delayed blasting of the electronic detonator) and kg; r is the distance from the particle to the explosion center of the explosive and m.
The single-shot explosive quantity and the distance between the explosion point and the pipeline are known, the generated vibration speed is predicted, for example, the vibration speed exceeds the vibration threshold value by 2cm/s, and the vibration speed generated by explosion is reduced by reducing the explosive quantity or increasing the distance, so that the aim of protecting the pipeline is fulfilled.
And evaluating the pile foundation construction in a field simulation test mode. Selecting a point location which is geologically similar to a construction area, selecting the same construction pile type, adopting the same construction frequency, monitoring the vibration speed and the acceleration generated by vibration waves at the same position of the construction area, which is distant from the pipeline, by using a land long-distance pipeline multichannel state monitoring and stray current data acquisition device, and checking whether the strain generated by the pipeline is satisfied with the standard requirement or not by the vibration speed and the acceleration through related standards so as to make constraint on the distance and the frequency of pile foundation construction.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (9)
1. Multi-channel state monitoring and stray current data acquisition device for land long-distance pipeline, which is characterized by comprising:
the submodule of the state monitoring module comprises a vibrating wire acquisition terminal, a vibrating wire sensor and a magnetoelectric sensor, wherein the vibrating wire sensor detects and acquires a frequency signal through the vibrating wire sensor, performs analog-to-digital conversion of sensor frequency and temperature physical quantity, and the magnetoelectric sensor is used for acquiring a speed acceleration signal;
the submodule of the audible and visual alarm module comprises a threshold setting CPU and an audible and visual alarm, the threshold setting CPU is connected with the state monitoring module, and when the CPU processing data find that the threshold exceeds a set threshold value, a command is sent to make the audible and visual alarm sound and the alarm lamp light;
the sub-modules of the stray current data acquisition module include,
the data acquisition submodule is used for measuring the alternating current density, the power-on potential, the power-off potential, the alternating current voltage, the alternating current and the direct current values of the pipeline;
the remote positioning sub-module is used for obtaining the self position of the equipment;
the USB communication sub-module is used for realizing the USB communication function of the equipment;
the power supply module is connected with the state monitoring module and the stray current data acquisition module and is used for power supply switching and energy control;
the data transmission module is connected with the state monitoring module, the audible and visual alarm module and the stray current data acquisition module and is used for transmitting acquired data to a data center;
the data center is connected with the data transmission module to realize the storage interaction of data.
2. The land long-distance pipeline multichannel state monitoring and stray current data acquisition device according to claim 1, wherein: the data acquisition submodule adopts an analog-to-digital converter chip to acquire analog data such as voltage, current and potential, the analog-to-digital converter chip is connected with a circuit to be tested through two precision instrument amplifiers to respectively realize the potential of a test piece under the condition of power on and power off, a bidirectional current detection amplifying chip and a relay are arranged on the circuit to be tested to monitor and acquire the direct current and alternating current data, and a control chip is arranged on the precision instrument amplifier at a detection power on point to configure the amplification factor of an amplifier for acquiring the power on potential under the power on state; and a measuring chip is arranged on a circuit connected with each precision instrument amplifier and the analog-to-digital converter chip to convert alternating voltage into equivalent direct voltage for measurement.
3. The land long-distance pipeline multichannel state monitoring and stray current data acquisition device according to claim 1, wherein: the data acquisition sub-module is provided with a flash memory chip which is connected with the singlechip through an SPI mode for local data storage, and the singlechip reserves a serial port and is connected with the data transmission module.
4. The land long-distance pipeline multichannel state monitoring and stray current data acquisition device according to claim 1, wherein: the USB communication sub-module is provided with a key detection and a comparator chip with a precise reference, when the USB interface is not connected, whether a switch key is pressed down is monitored, whether the internal working state of the equipment needs to be changed is judged, and when the USB interface is connected with external equipment, the key detection function is temporarily closed through a set relay.
5. The land long-distance pipeline multichannel state monitoring and stray current data acquisition device according to claim 2, wherein: the data transmission module comprises an integrated antenna and an intelligent data terminal, and is connected with the intelligent data terminal through the integrated antenna to conduct data remote transmission.
6. The land long-distance pipeline multichannel state monitoring and stray current data acquisition device according to claim 2, wherein: two end points of a K signal point position, an RL1 load point position and a test point position TP13 are arranged on the circuit to be tested, two supporting legs of the precision instrument amplifier U14 are respectively connected with the K signal point position and the RL1 load point position at one end, and two supporting legs of the precision instrument amplifier U11 are respectively connected with the K signal point position and the test point position TP13 at the other end.
7. The land long-distance pipeline multichannel state monitoring and stray current data acquisition device according to claim 6, wherein: the data acquisition submodule adopts a test piece method to acquire potential, two ends of a K signal point position are connected with a test piece, a test point position TP13 is connected with a measured pipeline or a structure, a RL1 load point position is connected with a reference electrode, the potential difference between the test piece and the reference electrode after partial pressure reduction is detected through a precision instrument amplifier U14, the detection voltage of the precision instrument amplifier U11 is the potential difference between the test piece and the pipeline, an analog-digital converter chip acquires and transmits the acquired data to a singlechip for data processing through conversion, so that data such as voltage and current between the pipeline and the reference are obtained, the pipeline polarization condition is obtained, and the current pipeline cathode protection effect is judged.
8. The land long-distance pipeline multichannel state monitoring and stray current data acquisition device according to claim 6, wherein: the data acquisition submodule adopts a double-potential method to acquire potential, two ends of a K signal point are connected with a reference electrode end, a test point TP13 is connected with a second channel potential test point, a RL1 load point is connected with a first channel potential test point, a precision instrument amplifier U14 detects the differential pressure between the reference electrode after reduction multiple and the first test point, a precision instrument amplifier U11 detects the differential pressure between the reference electrode and the second test point, and an analog-digital converter chip acquires and transmits the differential pressure to a singlechip for data processing through conversion to obtain the differential pressure at two ends of a measured length pipeline.
9. The land long-distance pipeline multichannel state monitoring and stray current data acquisition device according to claim 1, wherein: the blasting vibration speed prediction model arranged in the land long-distance pipeline multichannel state monitoring and stray current data acquisition device is specifically,
wherein V is particle vibration speed, and the unit is cm/s; q is the single-sound dosage, and the unit is kg; r is the distance from the particle to the explosion center of the explosive, and the unit is m.
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| CN202310823671.7A CN116839670A (en) | 2023-07-06 | 2023-07-06 | Multi-channel state monitoring and stray current data acquisition device for land long-distance pipeline |
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| CN202310823671.7A CN116839670A (en) | 2023-07-06 | 2023-07-06 | Multi-channel state monitoring and stray current data acquisition device for land long-distance pipeline |
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