Underground space leakage detection equipment and method

Abstract

The invention provides underground space leakage detection equipment and method, the equipment is composed of a data acquisition host and a detection probe, and the data acquisition host comprises a main control module, a transmitting module, a power supply module and a data acquisition module; the detection probe is provided with a power supply electrode, a detection electrode, a pushing device and a probe frame. The power supply electrode is responsible for supplying power to a detection target and exciting an electric signal; the detection electrode collects a potential difference signal. The pushing device ensures good contact between the electrode and the target surface so as to improve the detection precision. The power supply module is connected with the master control module, the transmitting module and the data acquisition module to ensure coordinated operation of each part. The data acquisition module preprocesses the acquired potential difference signal and sends a result to the main control module, and the main control module determines a leakage position by analyzing the signal and realizes visual display. According to the invention, powerful technical support is provided for safety monitoring and maintenance of the underground space, and the efficiency and accuracy of leakage detection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of safety detection and monitoring of underground space engineering structures, and in particular to an underground space leakage detection device and method. Background Art

[0002] In modern urban construction, underground space is an important resource for urban development, and its development and utilization are becoming more and more extensive, including underground buildings, tunnels, subway systems, drainage pipes and water storage facilities. The safety and stability of these underground space structures are directly related to the safety and efficiency of urban operations. However, due to complex geological conditions, difficult construction, increasing service life and the influence of natural factors (such as groundwater and soil pressure changes), underground space structures often face leakage problems.

[0003] Leakage not only causes corrosion and damage to structural materials, reduces structural strength and durability, but may also trigger chain reactions such as rising groundwater levels and soil wetting and expansion, further threatening the safety of ground buildings. In addition, leakage may also pollute groundwater and cause irreversible damage to the ecological environment. Therefore, timely and accurate detection of leakage in underground space structures is of great significance for ensuring the integrity of urban infrastructure, maintaining public safety and the ecological environment.

[0004] Traditional leakage detection methods mostly rely on manual inspections, water pressure tests and other means. These methods have disadvantages such as low detection efficiency, poor accuracy, and great damage to the structure, and are difficult to meet the needs of modern underground space management. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an underground space leakage detection device and method, which can realize efficient, accurate and non-destructive detection of underground space structure leakage by integrating advanced sensor technology, intelligent algorithm and data processing technology, and provide strong technical support for the safe monitoring and maintenance of underground space.

[0006] To achieve the above object, the present invention provides the following solutions: An underground space leakage detection device, comprising: a data acquisition host and a detection probe; the data acquisition host comprises: a main control module, a transmitting module, a power module and a data acquisition module; the detection probe comprises: a first power supply electrode, a second power supply electrode, a first detection electrode, a second detection electrode, a pushing device and a probe frame; The power supply module is connected to the main control module, the transmitting module and the data acquisition module respectively; the main control module is connected to the transmitting module and the data acquisition module respectively; the first power supply electrode, the second power supply electrode, the first detection electrode and the second detection electrode are all arranged on the probe frame through the corresponding pushing device; the pushing device is used to push each electrode through elastic force to ensure that each electrode is in contact with the detection target; the first power supply electrode and the second power supply electrode are connected to the transmitting module respectively; the first detection electrode and the second detection electrode are connected to the data acquisition module respectively; the first power supply electrode and the second power supply electrode are used to supply power to the detection target after the transmitting electrode of the transmitting module excites an electrical signal; the first detection electrode and the second detection electrode are used to collect a potential difference signal; the data acquisition module is used to pre-process the potential difference signal and send the obtained pre-processed signal to the main control module; the main control module is used to determine the leakage position according to the potential difference signal and visualize the leakage position.

[0007] Preferably, the first detection electrode and the second detection electrode are both arranged between the first power supply electrode and the second power supply electrode.

[0008] Preferably, the transmitting module includes: a boosting submodule, a square wave generating submodule and a sine wave generating submodule; the boosting submodule is used to generate a direct current type electrode excitation electrical signal; the square wave generating submodule is used to generate a square wave type electrode excitation electrical signal of different frequencies; the sine wave generating submodule is used to generate a sine wave type electrode excitation electrical signal of different frequencies.

[0009] Preferably, the preprocessing process includes: analog-to-digital conversion.

[0010] Preferably, the power supply module is a direct current power supply.

[0011] A method for detecting underground space leakage, applied to the above-mentioned underground space leakage detection device, the method comprising: The detection probe is arranged on the surface of the detection object to be detected; Using a transmitting module to transmit an electrode excitation electrical signal to the first power supply electrode and the second power supply electrode to supply power to the detection target; Measuring the potential difference between the first detection electrode and the second detection electrode to obtain a potential difference signal; Uploading the collected potential difference signal to the main control module through the data acquisition module to perform real-time processing on the collected potential difference signal; After the measurement is completed, the detection probe is moved to the next position of the detection target for measurement until the measurement of all positions of the detection target is completed, and the detection result of the point where the detection probe is located is determined according to each potential difference signal processed in real time.

[0012] Preferably, the collected potential difference signal is processed in real time to display the detection result of the point where the detection probe is located, including: The apparent resistivity distribution is calculated according to the potential difference signal; the calculation formula of the apparent resistivity distribution is: ;in, is the apparent resistivity distribution, is the potential difference between the first power supply electrode and the second power supply electrode, a current for supplying the first power supply electrode and the second power supply electrode, is the device coefficient; ,in, is the distance between the first power supply electrode and the first detection electrode, is the distance between the second power supply electrode and the first detection electrode, is the distance between the first power supply electrode and the second detection electrode, is the distance between the second power supply electrode and the first detection electrode; It is determined whether the apparent resistivity distribution is abnormal. If so, the point where the detection probe is located is determined as the leakage point.

[0013] Preferably, the collected potential difference signal is processed in real time to display the detection result of the point where the detection probe is located, including: Measuring a preset detection target without leakage to obtain a standard potential curve; Measure each detection target position one by one to obtain the measurement target potential curve; The difference between the standard potential curve and the measurement target potential curve is calculated to obtain a leakage index; the calculation formula of the leakage index is: , R is the calculated leakage index, is the standard signal, is the signal of the measured target point, and i is the number of repeated measurements at the same point; The leakage point location is determined according to the difference index.

[0014] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: The present invention provides an underground space leakage detection device and method, the device includes: a data acquisition host and a detection probe; the data acquisition host includes: a main control module, a transmitting module, a power supply module and a data acquisition module; the detection probe includes: a first power supply electrode, a second power supply electrode, a first detection electrode, a second detection electrode, a pushing device and a probe frame; the power supply module is respectively connected to the main control module, the transmitting module and the data acquisition module; the main control module is respectively connected to the transmitting module and the data acquisition module; the first power supply electrode, the second power supply electrode, the first detection electrode and the second detection electrode are all arranged on the probe frame through the corresponding pushing device; the pushing device is used for The electrodes are pushed by elastic force to ensure that each electrode is in contact with the detection target; the first power supply electrode and the second power supply electrode are respectively connected to the transmitting module; the first detection electrode and the second detection electrode are respectively connected to the data acquisition module; the first power supply electrode and the second power supply electrode are used to supply power to the detection target after the transmitting electrode of the transmitting module excites an electrical signal; the first detection electrode and the second detection electrode are used to collect a potential difference signal; the data acquisition module is used to pre-process the potential difference signal and send the obtained pre-processed signal to the main control module; the main control module is used to determine the leakage position according to the potential difference signal and visualize the leakage position. The present invention integrates advanced sensor technology, intelligent algorithms and data processing technology to achieve efficient, accurate and non-destructive detection of leakage in underground space structures, providing strong technical support for the safety monitoring and maintenance of underground spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 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 these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the device structure provided by an embodiment of the present invention; Figure 2 A flow chart of a method provided by an embodiment of the present invention; Figure 3 A schematic diagram of detection results provided by an embodiment of the present invention.

[0017] Description of reference numerals: 1-data acquisition host, 11-main control module, 12-transmitting module, 13-power module, 14-data acquisition module, 2-detection probe, A-first power supply electrode, B-second power supply electrode, M-first detection electrode, N-second detection electrode, 21-pushing device, 22-probe frame. DETAILED DESCRIPTION

[0018] 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.

[0019] The purpose of the present invention is to provide an underground space leakage detection device and method. The present invention integrates advanced sensor technology, intelligent algorithm and data processing technology to realize efficient, accurate and non-destructive detection of underground space structure leakage, and provide strong technical support for the safe monitoring and maintenance of underground space.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 A schematic diagram of the device structure provided by an embodiment of the present invention, such as Figure 1As shown, the present invention provides an underground space leakage detection device, including: a data acquisition host 1 and a detection probe 2; the data acquisition host 1 includes: a main control module 11, a transmitting module 12, a power module 13 and a data acquisition module 14; the detection probe 2 includes: a first power supply electrode A, a second power supply electrode B, a first detection electrode M, a second detection electrode N, a pushing device 21 and a probe frame 22; the power module 13 is respectively connected to the main control module 11, the transmitting module 12 and the data acquisition module 14; the main control module 11 is respectively connected to the transmitting module 12 and the data acquisition module 14; the first power supply electrode A, the second power supply electrode B, the first detection electrode M, the second detection electrode N are all arranged on the probe frame 22 through the corresponding pushing device 21; The pushing device 21 is used to push each electrode through elastic force to ensure that each electrode is in contact with the detection target; the first power supply electrode A and the second power supply electrode B are respectively connected to the transmitting module 12; the first detection electrode M and the second detection electrode N are respectively connected to the data acquisition module 14; the first power supply electrode A and the second power supply electrode B are used to supply power to the detection target after the transmitting module 12 transmits the electrode excitation electrical signal; the first detection electrode M and the second detection electrode N are used to collect the potential difference signal; the data acquisition module 14 is used to pre-process the potential difference signal (analog-to-digital conversion) and send the obtained pre-processed signal to the main control module 11; the main control module 11 is used to determine the leakage position according to the potential difference signal and visualize the leakage position. The first detection electrode M and the second detection electrode N are both arranged between the first power supply electrode A and the second power supply electrode B. The transmitting module 12 includes: a boost submodule, a square wave generating submodule and a sine wave generating submodule; the boost submodule is used to generate a DC type electrode excitation electrical signal; the square wave generating submodule is used to generate a square wave type electrode excitation electrical signal of different frequencies; the sine wave generating submodule is used to generate a sine wave type electrode excitation electrical signal of different frequencies. The power supply module 13 is a DC power supply.

[0022] Specifically, the detection equipment of this embodiment mainly includes: ①Data collection host: Control, acquisition, and processing module (main control module 11): high-performance tablet computer with built-in system control, data acquisition, data processing and other software systems; Power module 13: DC power supply, which supplies power to the transmitting module, data acquisition module, control, acquisition and processing module; Transmitter module 12: includes a boost module, a square wave generation module, and a sine wave generation module; after receiving commands from the control, acquisition, and processing modules, it can supply power to probes A and B, with power supplies of direct current of different voltages, square wave signals of different frequencies, and sine wave signals; Data acquisition module 14: after receiving the command from the control, acquisition and processing module, the voltage signals of the probes M and N can be digitized to realize analog-to-digital conversion, and then the data is transmitted to the control, acquisition and processing module, and processed and displayed by the processing module.

[0023] ②Detection probe: Electrodes A and B (first power supply electrode A and second power supply electrode B): power supply electrodes, connected to the positive and negative electrodes of the transmitting module respectively. After the transmitting electrode excites the electrical signal, power is supplied to the detection target through the power supply electrode; Electrodes M, N (first detection electrode M, second detection electrode N): detection electrodes, respectively connected to the input channel and ground wire of the data acquisition system to measure the potential difference between MN; Pushing device 21: Pushing the electrode through the elastic device can ensure that the electrode is in full contact with the target on an uneven target; Probe frame 22: Install electrodes, and the result design can adjust the mutual distances of A, B, M, and N to meet different detection depth requirements.

[0024] Specifically, Figure 2 As shown, this embodiment also provides an underground space leakage detection method, which is applied to the above-mentioned underground space leakage detection device, and the method includes: Step 100: placing a detection probe on the surface of a detection target; Step 200: using a transmitting module to transmit an electrode excitation electrical signal to a first power supply electrode and a second power supply electrode, so as to supply power to the detection target; Step 300: measuring the potential difference between the first detection electrode and the second detection electrode to obtain a potential difference signal; Step 400: uploading the collected potential difference signal to the main control module through the data acquisition module to perform real-time processing on the collected potential difference signal; Step 500: After the measurement is completed, the detection probe is moved to the next position of the detection target for measurement until the measurement of all positions of the detection target is completed, and the detection result of the point where the detection probe is located is determined according to each potential difference signal processed in real time.

[0025] Furthermore, the on-site operation steps of this embodiment are as follows: ① Place the detection probe close to the surface of the basement or underground structure to be detected, start to supply power to the A and B electrodes. The electrical signal is direct current, square waves of different frequencies, and sine waves of different frequencies, and measure the potential difference between M and N; ② The collected potential difference data is uploaded to the control, acquisition and processing module, which processes the collected data in real time and displays the detection results of the point; ③After measuring the point, move to the next measurement and repeat the above process until the measurement of all detection targets is completed.

[0026] Preferably, the collected potential difference signal is processed in real time to display the detection result of the point where the detection probe is located, including: The apparent resistivity distribution is calculated according to the potential difference signal; the calculation formula of the apparent resistivity distribution is: ;in, is the apparent resistivity distribution, is the potential difference between the first power supply electrode and the second power supply electrode, a current for supplying the first power supply electrode and the second power supply electrode, is the device coefficient; ,in, is the distance between the first power supply electrode and the first detection electrode, is the distance between the second power supply electrode and the first detection electrode, is the distance between the first power supply electrode and the second detection electrode, is the distance between the second power supply electrode and the first detection electrode; It is determined whether the apparent resistivity distribution is abnormal. If so, the point where the detection probe is located is determined as the leakage point.

[0027] Preferably, the collected potential difference signal is processed in real time to display the detection result of the point where the detection probe is located, including: Measuring a preset detection target without leakage to obtain a standard potential curve; Measure each detection target position one by one to obtain the measurement target potential curve; The difference between the standard potential curve and the measurement target potential curve is calculated to obtain a leakage index; the calculation formula of the leakage index is: , R is the calculated leakage index, is the standard signal, is the signal of the measured target point, and i is the number of repeated measurements at the same point; The leakage point location is determined according to the difference index.

[0028] like Figure 3 As shown, the data processing method of this embodiment is as follows: ① Abnormal potential intensity due to leakage: Due to leakage, the water content inside the wall is obviously increased, and the resistivity of the target body becomes lower. By calculating the resistivity anomaly, the location of the leakage point is obtained.

[0029] Resistivity calculation formula: according to , the apparent resistivity distribution can be obtained.

[0030] in .

[0031] Furthermore, the location of the leakage point is obtained by calculating the resistivity anomaly, as follows: Measure the resistivity values ​​of multiple non-leakage locations on the same measured wall, and find the average and minimum values. The calculated resistivity is judged according to the following standards: if the calculated resistivity is greater than the average value, it is considered to be non-leakage; if it is between the average value and the minimum value, it is a suspicious area; if it is less than the minimum value, it is a leakage area.

[0032] ② Abnormal potential change caused by leakage: Leakage causes the moisture content of the wall to increase. At the same time, due to seepage, the waveform characteristics are different when measuring the target square wave and sine wave signals. By measuring the non-leakage position, the standard curve is obtained, and then each target point is measured one by one to obtain the difference between the measured target curve and the standard curve. The largest difference is generally the leakage position.

[0033] Specific calculation formula:

[0034] R is the calculated leakage index, is the standard signal, To measure the signal of the target point.

[0035] Furthermore, in this embodiment, the R value of water is measured in water as Rw; if R is less than 0.05Rw, it is not leaking, R=0.05-0.2 is a suspicious area, and R greater than 0.2 is a leaking area.

[0036] The beneficial effects of the present invention are as follows: The present invention integrates advanced sensor technology, intelligent algorithms and data processing technology to achieve efficient, accurate and non-destructive detection of underground space structure leakage, providing strong technical support for the safe monitoring and maintenance of underground space.

[0037] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0038] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An underground space leakage detection device, characterized in that: include: Data acquisition host and detection probe; The data acquisition host includes: a main control module, a transmitting module, a power module and a data acquisition module; the detection probe includes: a first power supply electrode, a second power supply electrode, a first detection electrode, a second detection electrode, a pushing device and a probe frame; The power supply module is connected to the main control module, the transmitting module and the data acquisition module respectively; the main control module is connected to the transmitting module and the data acquisition module respectively; the first power supply electrode, the second power supply electrode, the first detection electrode and the second detection electrode are all arranged on the probe frame through the corresponding pushing device; the pushing device is used to push each electrode through elastic force to ensure that each electrode is in contact with the detection target; the first power supply electrode and the second power supply electrode are connected to the transmitting module respectively; the first detection electrode and the second detection electrode are connected to the data acquisition module respectively; the first power supply electrode and the second power supply electrode are used to supply power to the detection target after the transmitting electrode of the transmitting module excites an electrical signal; the first detection electrode and the second detection electrode are used to collect a potential difference signal; the data acquisition module is used to pre-process the potential difference signal and send the obtained pre-processed signal to the main control module; the main control module is used to determine the leakage position according to the potential difference signal and visualize the leakage position.

2. The underground space leakage detection equipment according to claim 1, characterized in that: The first detection electrode and the second detection electrode are both disposed between the first power supply electrode and the second power supply electrode.

3. The underground space leakage detection equipment according to claim 1, characterized in that: The transmitting module includes: a boosting submodule, a square wave generating submodule and a sine wave generating submodule; the boosting submodule is used to generate a direct current type electrode excitation electrical signal; the square wave generating submodule is used to generate a square wave type electrode excitation electrical signal of different frequencies; the sine wave generating submodule is used to generate a sine wave type electrode excitation electrical signal of different frequencies.

4. The underground space leakage detection equipment according to claim 1, characterized in that: The preprocessing process includes: analog-to-digital conversion.

5. The underground space leakage detection equipment according to claim 1, characterized in that: The power supply module is a direct current power supply.

6. A method for detecting underground space leakage, characterized in that: The underground space leakage detection device applied to any one of claims 1 to 5, the method comprising: The detection probe is arranged on the surface of the detection object to be detected; Using a transmitting module to transmit an electrode excitation electrical signal to the first power supply electrode and the second power supply electrode to supply power to the detection target; Measuring the potential difference between the first detection electrode and the second detection electrode to obtain a potential difference signal; Uploading the collected potential difference signal to the main control module through the data acquisition module to perform real-time processing on the collected potential difference signal; After the measurement is completed, the detection probe is moved to the next position of the detection target for measurement until the measurement of all positions of the detection target is completed, and the detection result of the point where the detection probe is located is determined according to each potential difference signal processed in real time.

7. The underground space leakage detection method according to claim 6, characterized in that: The collected potential difference signal is processed in real time to display the detection result of the point where the detection probe is located, including: The apparent resistivity distribution is calculated according to the potential difference signal; the calculation formula of the apparent resistivity distribution is: ;in, is the apparent resistivity distribution, is the potential difference between the first power supply electrode and the second power supply electrode, a current for supplying the first power supply electrode and the second power supply electrode, is the device coefficient; ,in, is the distance between the first power supply electrode and the first detection electrode, is the distance between the second power supply electrode and the first detection electrode, is the distance between the first power supply electrode and the second detection electrode, is the distance between the second power supply electrode and the first detection electrode; It is determined whether the apparent resistivity distribution is abnormal. If so, the point where the detection probe is located is determined as the leakage point.

8. The underground space leakage detection method according to claim 6, characterized in that: The collected potential difference signal is processed in real time to display the detection result of the point where the detection probe is located, including: Measuring a preset detection target without leakage to obtain a standard potential curve; Measure each detection target position one by one to obtain the measurement target potential curve; The difference between the standard potential curve and the measurement target potential curve is calculated to obtain a leakage index; the calculation formula of the leakage index is: , R is the calculated leakage index, is the standard signal, is the signal of the measured target point, and i is the number of repeated measurements at the same point; The leakage point location is determined according to the difference index.

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