A real-time monitoring device for the corrosion condition of large drainage culverts

Abstract

The present invention discloses a real-time monitoring device for the corrosion status of large drainage pipe culverts in the field of pipeline anti-corrosion technology, including a water intake component. One end of the water intake component is connected to a corrosion monitoring component through a pipeline. The water intake component is used to extract sewage in the large drainage pipe culvert and transport the sewage to the corrosion monitoring component. One end of the corrosion monitoring component is connected to a gas generation component through a pipeline. The corrosion monitoring component includes an immersion chamber and a test structure installed in the immersion chamber. The present invention can ensure that the sewage in the corrosion monitoring component is consistent with the pipeline flow state in the newly built or spray-coated and repaired large drainage pipe culvert. At the same time, after the newly built or spray-coated and repaired large drainage pipe culvert is put into operation, there is no need to stop water for detection, which improves the flexibility of the detection of large drainage pipe culverts. By collecting and simulating the corrosion situation in the large drainage pipe culvert in real time, the internal corrosion situation of the pipeline can be observed in real time, and the difficulty of taking countermeasures against the corrosion mechanism of the large drainage pipe culvert is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline anti-corrosion, and specifically to a real-time monitoring device for the corrosion condition of large drainage culverts. Background Art

[0002] As the main underground drainage channel of the urban drainage system, large drainage culverts play an irreplaceable role in ensuring the timely discharge of urban rainwater and sewage. Generally, the inner diameter of large drainage culverts is greater than 1.5 meters or the cross-sectional area is greater than 1.766 square meters. During the use of large drainage culverts, they often have the characteristics of large fluctuations in flow velocity and flow rate, and a large amount of debris inside the culverts. Microorganisms are prone to multiply in large numbers inside them and produce corrosive gases. During long-term use, water leakage is likely to occur inside large drainage culverts due to inner wall corrosion. Therefore, monitoring the corrosion condition of the inner wall of large drainage culverts is extremely important for the safe discharge of water bodies.

[0003] Traditional corrosion monitoring devices are mostly limited to simulation tests in laboratories. There are differences between the concentration of water pollutants and the gas environment and the actual corrosion environment, making it difficult to accurately evaluate the corrosion resistance of pipeline materials, and even more difficult to explore the corrosion process of large drainage culverts under the coupling action of multiple factors. On the other hand, after newly built or spray-coated and repaired large drainage culverts are put into operation, water shut-off detection is often required during on-site inspection. However, as the main pipeline, it is usually difficult to achieve water shut-off detection for large drainage culverts, resulting in the inability to effectively observe the internal corrosion situation of the pipeline, increasing the difficulty of taking countermeasures against the corrosion mechanism of large drainage culverts, being unfavorable for controlling the generation of corrosive substances inside large drainage culverts, and difficult to improve the corrosion resistance of the drainage system. Summary of the Invention

[0004] The purpose of the present invention is to provide a real-time monitoring device for the corrosion condition of large drainage culverts. After newly built or spray-coated and repaired large drainage culverts are put into operation, water shut-off detection is not required, greatly improving the flexibility of the detection of large drainage culverts. By collecting and simulating the corrosion situation inside large drainage culverts in real time, the internal corrosion situation of the pipeline can be observed in real time, reducing the difficulty of taking countermeasures against the corrosion mechanism of large drainage culverts, being conducive to controlling the generation of corrosive substances inside large drainage culverts, and improving the corrosion resistance of the drainage system.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A real-time monitoring device for the corrosion condition of large drainage culverts includes a water intake component. One end of the water intake component is connected to a corrosion monitoring component through a pipeline. The corrosion monitoring component is a simulation system for large drainage culverts. The water intake component is used to extract sewage inside the large drainage culvert and transport the sewage to the corrosion monitoring component, so that the sewage inside the corrosion monitoring component is consistent with the sewage inside the large drainage culvert.

[0007] One end of the corrosion monitoring component is connected to the gas generation component through a pipeline. The corrosion monitoring component includes an immersion chamber and a test structure installed in the immersion chamber. The corrosion monitoring component is used to receive sewage, monitor the corrosion state of the test structure immersed in the sewage, and the gas environment data at the location where the test structure is located. The corrosion monitoring component is designed based on the Froude number similarity criterion, which can ensure that the flow regime of the sewage in the corrosion monitoring component is consistent with that in the newly built or spray-coated and repaired large drainage pipe culvert.

[0008] The corrosion monitoring component is installed near the corrosion area of the large drainage pipe culvert and is put into use simultaneously with the actually newly built or spray-coated and repaired large drainage pipe culvert to collect the corrosion situation of the large drainage pipe culvert in real time. The corrosion monitoring component can conduct long-term corrosion resistance performance tests on local segments of large drainage pipe culverts made of different materials, can observe and record the changes during the corrosion process in real time, and can also monitor the corrosion behavior of different materials used in large drainage pipe culverts under the action of sewage environment and multi-factor coupling, providing a practical basis for the operation and maintenance of large drainage pipe culverts and the pipeline detection cycle. The effluent of the corrosion monitoring component is discharged into the large drainage pipe culvert through a pipeline connected to a variable-frequency sewage pump to prevent pollution from overflowing.

[0009] The gas generation component is used to input corrosive gas into the immersion chamber according to the gas environment data to adjust the corrosive gas parameters in the immersion chamber.

[0010] As a further solution of the present invention: the water intake component is a variable-frequency sewage pump. The variable-frequency sewage pump is immersed in the sewage in the actual large drainage pipe culvert. The input end of the variable-frequency sewage pump is electrically connected to an external power supply. The variable-frequency sewage pump includes a water pump and a variable-frequency speed regulator. The variable-frequency speed regulator is used to adjust the motor speed of the water pump, thereby controlling the amount of sewage transported by the water pump per unit time. It can adjust the pumping flow rate of the water pump to adapt to the characteristics of large fluctuations in sewage flow velocity and flow rate in the large drainage pipe culvert.

[0011] A stainless steel filter screen is installed at the water inlet of the water pump. The stainless steel filter screen can prevent foreign matters from being introduced into the sewage flowing into the variable-frequency sewage pump. After the sewage is filtered by the stainless steel filter screen, it is input into the immersion chamber by the variable-frequency sewage pump through an electromagnetic flowmeter.

[0012] The water pump pipeline is connected to the immersion chamber, and an electromagnetic flowmeter is installed on the connecting pipeline between the water pump and the immersion chamber. The electromagnetic flowmeter is used to measure the flow rate of the sewage flowing into the immersion chamber.

[0013] As a further solution of the present invention: the corrosion monitoring component includes a controller. The signal input pin of the controller is connected to a first data acquisition module. The first data acquisition module is used to collect the gas concentration generated by the sewage in the large drainage pipe culvert.

[0014] The signal input pin of the controller is connected to a second data acquisition module, and the second data acquisition module is used to collect the temperature of the sewage inside the corrosion monitoring component and the humidity data of the gas above the sewage;

[0015] The signal input pin of the controller is connected to a third data acquisition module, and the third data acquisition module is used to collect the pH value, the concentration value of total organic carbon, and the chemical oxygen demand value of the sewage in the soaking chamber;

[0016] The signal input pin of the controller is connected to a fourth data acquisition module, and the fourth data acquisition module is used to detect the flow rate and flow velocity of the sewage in the large drainage pipe culvert.

[0017] As a further solution of the present invention: the first data acquisition module includes an integrated methane gas concentration sensor, a hydrogen sulfide gas concentration sensor, and a carbon dioxide gas concentration sensor. The methane gas concentration sensor is used to detect the methane gas concentration above the sewage in the large drainage pipe culvert, the hydrogen sulfide gas concentration sensor is used to detect the hydrogen sulfide gas concentration above the sewage in the large drainage pipe culvert, and the carbon dioxide gas concentration sensor is used to detect the carbon dioxide gas concentration above the sewage in the large drainage pipe culvert;

[0018] The second data acquisition module includes a temperature sensor and a humidity sensor. The temperature sensor is used to collect the temperature data of the sewage in the large drainage pipe culvert, and the humidity sensor is used to collect the humidity data of the gas above the internal sewage in the large drainage pipe culvert, and convert the temperature data and the humidity data into digital signals and send them to the processor of the controller respectively;

[0019] The third data acquisition module includes a pH sensor, a TOC sensor, and a COD sensor. The pH sensor is used to collect the pH value data of the sewage in the soaking chamber, convert the pH value data into a digital signal and send it to the processor, the TOC sensor is used to collect the total organic carbon data value of the sewage in the soaking chamber, and convert the total organic carbon data value into a digital signal and send it to the processor, and the COD sensor is used to collect the chemical oxygen demand value in the sewage;

[0020] The fourth data acquisition module is an ultrasonic flow velocity meter, and the ultrasonic flow velocity meter is used to measure the flow rate and flow velocity of the sewage in the large drainage pipe culvert by using ultrasonic waves.

[0021] As a further solution of the present invention: the test structure includes a plurality of columnar channels with openings and a plurality of test blocks. The plurality of columnar channels are fixed on the inner wall of the soaking chamber, and the test blocks are detachably clamped with the columnar channels. The top of the columnar channel is hermetically connected with a flange to ensure the airtightness of the device.

[0022] As a further solution of the present invention: a solid colored glass fiber rod is embedded inside the columnar channel. The diameter of the solid colored glass fiber rod is 1 mm - 3 mm. A plurality of solid colored glass fiber rods are embedded inside a single test block. The length of the solid colored glass fiber rod is equal to the thickness of the test block. The solid colored glass fiber rod is used to evaluate the corrosion degree of the steel bar protective layer of large drainage pipe culverts. When the test block is corroded, the solid colored glass fiber rod will be exposed. By observing the exposed length of the corroded solid colored glass fiber rod, the corrosion thickness of the test block can be visually observed, which can be used to evaluate the corrosion degree of the steel bar protective layer inside the large drainage pipe culvert.

[0023] As a further solution of the present invention: the color of the solid colored glass fiber rod is red.

[0024] As a further solution of the present invention: the test block includes one or several of a reinforced concrete block, a prestressed concrete block, and a high-strength block. The high-strength block is a solid block with a high-strength composite material sprayed on its surface. The soaking cavity is a concrete pipe with a hollow interior. The cross-section and longitudinal section of the soaking cavity are both rectangular. In order to adapt to the greater water flow pressure and external environment that large drainage pipe culverts may face, in practice, newly built or sprayed and repaired pipe segments usually adopt various materials with higher strength, corrosion resistance, and high pressure resistance, such as reinforced concrete, prestressed concrete, or high-strength composite spraying materials.

[0025] As a further solution of the present invention: ceramic chips are attached to the inner wall of the soaking cavity. The ceramic chips are alumina ceramic chips. A ring-shaped section is clamped on the inner wall of the soaking cavity. The ring-shaped section is a partial section of a large drainage pipe culvert. A liquid level gauge is installed at one end of the soaking cavity. The liquid level gauge is used to collect the liquid level height data of the sewage in the soaking cavity and send the collected height data to the processor. Therefore, multiple ring-shaped sections, which are also concrete pipes, are regarded as a discrete system composed of multiple small blocks. The multiple small blocks can be made of different materials used in large drainage pipe culverts. Along the length direction of the soaking cavity, different drainage pipe materials are combined and arranged to monitor the corrosion behavior and durability of different materials under the sewage environment and the coupling action of multiple factors. The ceramic chips are attached to the inner wall not covered by the test block. The alumina ceramic chip has a smooth surface, which can reduce turbulence and the impact force of the fluid on the inner wall of the soaking cavity, improving the service life of the corrosion monitoring component. Moreover, the alumina ceramic chip has a high hardness, which can enhance the wear resistance of the inner wall of the soaking cavity.

[0026] As a further solution of the present invention: The gas generation assembly includes a gas generation chamber, a magnetic stirrer installed inside the gas generation chamber, and a reactant supply bottle. The reactant supply bottle is used to set the type of reactant according to the gas to be prepared. For example, when preparing carbon dioxide, sodium bicarbonate can be placed. A reaction bottle is placed on the top of the magnetic stirrer, and the reaction bottle is filled with a reactant different from that in the reactant supply bottle. For example, when preparing carbon dioxide, citric acid is filled in the reaction bottle. The reactant supply bottle is connected to the reaction bottle through a pipeline, and a peristaltic pump is installed on the pipeline between the reactant supply bottle and the reaction bottle. The peristaltic pump is used to supply the reactant in the reactant supply bottle to the reaction bottle for reaction to generate a corrosive gas;

[0027] One end of the peristaltic pump is electrically connected to the first gas generation amount control module, and the output end of the first gas generation amount control module is electrically connected to an electromagnetic switching valve, and the electromagnetic switching valve is used to control the on-off of the gas introduced from the reaction bottle into the soaking chamber;

[0028] The output end of the first gas generation amount control module is electrically connected to the second gas generation amount control module. The first gas generation amount control module is used to collect the gas generation amount signal generated by the reaction in the reaction bottle and send the gas generation amount signal to the controller;

[0029] The second gas generation amount control module is used to collect the gas amount signal in the soaking chamber and send the gas amount signal to the controller. The controller compares the gas generation amount in the large drainage culvert with the gas generation amount in the soaking chamber. When the difference between the gas generation amount in the large drainage culvert and the gas generation amount in the soaking chamber does not meet the error range, the controller sends an adjustment signal to the first gas generation amount control module to adjust the composition and concentration of the gas generation amount in the soaking chamber to be consistent with that in the large drainage culvert. The controller is built-in with a storage module, and the storage module is used to record the data information received or sent by the controller.

[0030] As a further solution of the present invention: An electric heating plate and a temperature control module are embedded at the top of the magnetic stirrer. The magnetic stirrer is used to accelerate the reaction process and control the reaction temperature. The electric heating plate is used to heat the reaction solution in the reaction bottle. A one-way valve is connected to the lower end of the reactant supply bottle, and the one-way valve is used to supply air to the inside of the reactant supply bottle to maintain the pressure balance in the reactant supply bottle.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. The present invention can ensure that the sewage in the corrosion monitoring component is consistent with the pipeline flow regime in the newly built or spray - repaired large - diameter drainage culvert. At the same time, after the newly built or spray - repaired large - diameter drainage culvert is put into operation, there is no need to stop water for detection, which greatly improves the flexibility of large - diameter drainage culvert detection. By collecting and simulating the corrosion situation in the large - diameter drainage culvert in real time, the internal corrosion situation of the pipeline can be observed in real time, reducing the difficulty of taking countermeasures against the corrosion mechanism of the large - diameter drainage culvert, facilitating the control of the generation of corrosive substances in the large - diameter drainage culvert, and enhancing the corrosion resistance of the drainage system.

[0033] 2. The present invention can monitor the corrosion process of large - diameter drainage culverts in a sewage environment in real time, support the influence of multiple factors such as the microbial environment in the pipeline, the change of corrosive gases, the sewage composition, and sewage scouring on the corrosion behavior of concrete, and can maintain consistency with the actual corrosion environment during the monitoring process. It can be widely applied to fields such as municipal drainage systems, sewage pipeline design, construction, operation, and maintenance, with strong adaptability to different situations.

[0034] 3. In view of the characteristics of large - diameter drainage culverts, such as large flow velocity and large flow rate fluctuations, which easily cause corrosion of the pipe wall, by adopting a multi - level control acquisition structure, the present invention realizes the conditional control of the corrosion process of concrete drainage pipes, and can more efficiently and accurately monitor and evaluate the corrosion behavior of concrete with different materials under the coupling action of multiple factors.

[0035] 4. The present invention is designed with an integrated structure, which can reasonably optimize the structural space. By using the actual sewage in the large - diameter drainage culvert, it can deeply restore the sewer environment at the installation site of the large - diameter drainage culvert. It can not only realize the long - term corrosion resistance performance test of the large - diameter drainage culvert, but also observe the corrosion process in real time, visually observe the corrosion situation, and through intelligent control, achieve efficient and accurate testing and evaluation, providing theoretical and practical basis for the design, construction, and maintenance of large - and extra - large - diameter drainage pipes, and can effectively reduce the corrosion resistance ability during the actual operation of large - diameter drainage culverts. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural diagram of the real - time monitoring device of the present invention;

[0037] Figure 2 It is a longitudinal sectional view of the immersion chamber of the present invention;

[0038] Figure 3 It is a connection module diagram of the controller of the present invention;

[0039] Figure 4 It is a diagram of the first data acquisition module of the present invention;

[0040] Figure 5 It is a diagram of the second data acquisition module of the present invention;

[0041] Figure 6 It is the third data acquisition module diagram of the present invention;

[0042] Figure 7 It is the fourth data acquisition module diagram of the present invention.

[0043] In the figure: 1, variable-frequency sewage pump; 2, stainless steel filter screen; 3, first data acquisition module; 4, fourth data acquisition module; 5, electromagnetic flowmeter; 6, liquid level gauge; 7, second data acquisition module; 8, third data acquisition module; 9, immersion chamber; 10, gas generation chamber; 11, controller; 12, large drainage culvert; 13, columnar channel; 14, annular slice; 15, ceramic chip; 16, solid colored glass fiber rod; 17, test block; 18, magnetic stirrer; 19, reaction flask; 20, peristaltic pump; 21, check valve; 22, reagent supply bottle; 23, second gas generation amount control module; 24, first gas generation amount control module; 25, electromagnetic solenoid valve. Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] Embodiment:

[0046] Please refer to Figures 1 - 3 , in the embodiment of the present invention, a real-time monitoring device for the corrosion condition of a large drainage culvert includes a water intake component. One end of the water intake component is connected to the corrosion monitoring component through a pipeline. The corrosion monitoring component is a large drainage culvert simulation system. The water intake component is used to extract the sewage in the large drainage culvert 12 and transport the sewage to the corrosion monitoring component, so that the sewage in the corrosion monitoring component is consistent with the sewage in the large drainage culvert 12;

[0047] One end of the corrosion monitoring component is connected to the gas generation component through a pipeline. The corrosion monitoring component includes an immersion chamber 9 and a test structure installed in the immersion chamber 9. The corrosion monitoring component is used to receive sewage, monitor the corrosion state of the test structure immersed in the sewage, and the gas environment data at the position where the test structure is located;

[0048] The corrosion monitoring component is designed based on the Froude number similarity criterion, which can ensure that the flow state of the sewage in the corrosion monitoring component is consistent with the flow state of the pipeline in the newly built or spray-coated and repaired large drainage culvert;

[0049] The corrosion monitoring component is installed near the corrosion area of the large drainage pipe culvert 12 and put into use simultaneously with the newly built or spray - repaired large drainage pipe culvert 12 to collect the corrosion situation of the large drainage pipe culvert 12 in real - time. The corrosion monitoring component can conduct long - term corrosion resistance performance tests on local sections of large drainage pipe culverts made of different materials, can observe and record the changes during the corrosion process in real - time, and can also monitor the corrosion behavior of different materials used in large drainage pipe culverts under the action of sewage environment and multi - factor coupling, providing a practical basis for the operation and maintenance of the large drainage pipe culvert 12 and the pipeline detection cycle. The effluent of the corrosion monitoring component is discharged into the large drainage pipe culvert 12 through a pipeline connected to the variable - frequency sewage pump 1 to prevent pollution overflow.

[0050] The gas generation component is used to input corrosive gas into the soaking chamber 9 according to the gas environment data to adjust the corrosive gas parameters in the soaking chamber 9.

[0051] Preferably, the water intake component is the variable - frequency sewage pump 1. The variable - frequency sewage pump 1 is immersed in the sewage in the actual large drainage pipe culvert 12. The input end of the variable - frequency sewage pump 1 is electrically connected to an external power supply. The variable - frequency sewage pump 1 includes a water pump and a variable - frequency speed regulator. The variable - frequency speed regulator is used to adjust the motor speed of the water pump, thereby controlling the amount of sewage transported by the water pump per unit time, and can adjust the pumping flow rate of the water pump to adapt to the characteristics of large fluctuations in sewage flow velocity and flow rate in the large drainage pipe culvert 12.

[0052] A stainless - steel filter screen 2 is installed at the water inlet of the water pump. The stainless - steel filter screen 2 can prevent sundries from being introduced into the sewage flowing into the variable - frequency sewage pump 1. After the sewage is filtered by the stainless - steel filter screen 2, it is input into the soaking chamber 9 by the variable - frequency sewage pump 1 through the electromagnetic flowmeter 5.

[0053] The water pump pipeline is connected to the soaking chamber 9. An electromagnetic flowmeter 5 is installed on the connecting pipeline between the water pump and the soaking chamber 9. The electromagnetic flowmeter 5 is used to measure the flow rate of the sewage flowing into the soaking chamber 9.

[0054] Preferably, the corrosion monitoring component includes a controller 11. The signal input pin of the controller 11 is connected to a first data acquisition module 3. The first data acquisition module 3 is used to collect the gas concentration generated by the sewage in the large drainage pipe culvert 12.

[0055] The signal input pin of the controller 11 is connected to a second data acquisition module 7. The second data acquisition module 7 collects the temperature of the sewage inside the corrosion monitoring component and the humidity data of the gas above the sewage.

[0056] The signal input pin of the controller 11 is connected to a third data acquisition module 8. The third data acquisition module 8 is used to collect the pH value, the concentration value of total organic carbon, and the chemical oxygen demand value of the sewage in the soaking chamber 9.

[0057] The signal input pin of the controller 11 is connected to a fourth data acquisition module 4, and the fourth data acquisition module 4 is used to detect the flow rate and velocity of the sewage in the large drainage culvert 12.

[0058] As Figures 4 - 7 shown, preferably, the first data acquisition module 3 includes an integrated methane gas concentration sensor, a hydrogen sulfide gas concentration sensor, and a carbon dioxide gas concentration sensor. The methane gas concentration sensor is used to detect the methane gas concentration above the sewage in the large drainage culvert 12, the hydrogen sulfide gas concentration sensor is used to detect the hydrogen sulfide gas concentration above the sewage in the large drainage culvert 12, and the carbon dioxide gas concentration sensor is used to detect the carbon dioxide gas concentration above the sewage in the large drainage culvert 12;

[0059] The second data acquisition module 7 includes a temperature sensor and a humidity sensor. The temperature sensor is used to collect the temperature data of the sewage in the large drainage culvert 12, and the humidity sensor is used to collect the humidity data of the gas above the internal sewage of the large drainage culvert 12, and convert the temperature data and humidity data into digital signals and send them to the processor of the controller 11;

[0060] The third data acquisition module 8 includes a pH sensor, a TOC sensor, and a COD sensor. The pH sensor is used to collect the pH value data of the sewage in the soaking chamber 9 and convert the pH value data into a digital signal and send it to the processor. The TOC sensor is used to collect the total organic carbon data value of the sewage in the soaking chamber 9 and convert the total organic carbon data value into a digital signal and send it to the processor. The COD sensor is used to collect the chemical oxygen demand value in the sewage;

[0061] The fourth data acquisition module 4 is an ultrasonic flow velocity meter, and the ultrasonic flow velocity meter is used to measure the flow rate and velocity of the sewage inside the large drainage culvert 12 by using ultrasonic waves.

[0062] Preferably, the test structure includes a plurality of columnar channels 13 with openings and a plurality of test blocks 17. The plurality of columnar channels 13 are fixed on the inner wall of the soaking chamber 9. The test blocks 17 are detachably clamped with the columnar channels 13. The top of the columnar channel 13 is hermetically connected with a flange to ensure the airtightness of the device.

[0063] Preferably, a solid colored fiberglass rod 16 is embedded inside the columnar channel 13. The diameter of the solid colored fiberglass rod 16 is 1 mm. A number of solid colored fiberglass rods 16 are embedded inside a single test block 17. The length of the solid colored fiberglass rod 16 is equal to the thickness of the test block 17. The solid colored fiberglass rod 16 is used to evaluate the corrosion degree of the steel bar protection layer of the large drainage pipe culvert 12. When the test block is corroded, the solid colored fiberglass rod will be exposed. By observing the exposed length of the solid colored fiberglass rod after corrosion, the corrosion thickness of the test block can be visually observed, which can be used to evaluate the corrosion degree of the steel bar protection layer inside the large drainage pipe culvert.

[0064] Preferably, the color of the solid colored fiberglass rod 16 is red.

[0065] Preferably, the test block 17 includes one or several of a reinforced concrete block, a prestressed concrete block, and a high-strength block. The high-strength block is a solid block with a high-strength composite material sprayed on its surface. The soaking cavity 9 is a concrete pipe with a hollow interior. The cross-section and longitudinal section of the soaking cavity 9 are both rectangular. In order to adapt to the greater water flow pressure and external environment that the large drainage pipe culvert may face, in practice, the newly built or sprayed and repaired pipe sections usually adopt a variety of materials with higher strength, corrosion resistance, and high pressure resistance, such as reinforced concrete, prestressed concrete, or high-strength composite spraying materials.

[0066] Preferably, a ceramic chip 15 is attached to the inner wall of the soaking cavity 9. The ceramic chip 15 is an alumina ceramic chip. A ring-shaped slice 14 is clamped to the inner wall of the soaking cavity 9. The ring-shaped slice 14 is a partial cut section of the large drainage pipe culvert. A liquid level gauge 6 is installed at one end of the soaking cavity 9. The liquid level gauge 6 is used to collect the liquid level height data of the sewage in the soaking cavity 9 and send the collected height data to the processor. Therefore, multiple ring-shaped slices 14, which are also concrete pipes, are regarded as a discrete system composed of multiple small blocks. The multiple small blocks can be made of different materials used for the large drainage pipe culvert. Along the length direction of the soaking cavity 9, different drainage pipe materials are combined and arranged to monitor the corrosion behavior and durability of different materials under the sewage environment and the coupling action of multiple factors. The ceramic chip 15 is attached to the inner wall not covered by the test block 17. The alumina ceramic chip has a smooth surface, which can reduce turbulence and the impact force of the fluid on the inner wall of the soaking cavity 9, improving the service life of the corrosion monitoring component. Moreover, the alumina ceramic chip has a high hardness, which can enhance the wear resistance of the inner wall of the soaking cavity 9, as Figure 2 shown, where ① is the lowest pipe siltation layer; ② is the highest pipe siltation layer; ③ is the lowest water level; ④ is the highest water level.

[0067] Preferably, the gas generation assembly includes a gas generation chamber 10, a magnetic stirrer 18 installed inside the gas generation chamber 10, and a reactant supply bottle 22. The reactant supply bottle 22 is used to set the type of reactant according to the gas to be prepared. For example, when preparing carbon dioxide, sodium bicarbonate can be placed. A reaction bottle 19 is placed on the top of the magnetic stirrer 18. The reaction bottle 19 is filled with a reactant different from that in the reactant supply bottle 22. For example, when preparing carbon dioxide, the reaction bottle 19 is filled with citric acid. The reactant supply bottle 22 is connected to the reaction bottle 19 through a pipeline. A peristaltic pump 20 is installed on the pipeline between the reactant supply bottle 22 and the reaction bottle 19. The peristaltic pump 20 is used to supply the reactant in the reactant supply bottle 22 into the reaction bottle 19 for reaction to generate a corrosive gas;

[0068] One end of the peristaltic pump 20 is electrically connected to the first gas generation amount control module 24. The output end of the first gas generation amount control module 24 is electrically connected to an electromagnetic switching valve 25. The electromagnetic switching valve 25 is used to control the on / off of the gas introduced from the reaction bottle 19 into the soaking chamber 9;

[0069] The output end of the first gas generation amount control module 24 is electrically connected to the second gas generation amount control module 23. The first gas generation amount control module 24 is used to collect the gas generation amount signal generated by the reaction in the reaction bottle and send the gas generation amount signal to the controller 11;

[0070] The second gas generation amount control module 23 is used to collect the gas amount signal in the soaking chamber 9 and send the gas amount signal to the controller 11. The controller 11 compares the gas generation amount in the large drainage culvert 12 with the gas generation amount in the soaking chamber 9. When the difference between the gas generation amount in the large drainage culvert 12 and the gas generation amount in the soaking chamber 9 does not meet the error range, the controller 11 sends an adjustment signal to the first gas generation amount control module 24 to adjust the gas generation amount in the soaking chamber 9 to be consistent with the composition and concentration of the gas generation amount in the large drainage culvert 12. The controller 11 is internally provided with a storage module, and the storage module is used to record the data information received or sent by the controller 11.

[0071] Preferably, an electric heating plate and a temperature control module are embedded at the top of the magnetic stirrer 18. The magnetic stirrer 18 is used to accelerate the reaction process and control the reaction temperature. The electric heating plate is used to heat the reaction solution in the reaction bottle 19. A one-way valve 21 is connected to the lower end of the reactant supply bottle 22. The one-way valve 21 is used to supply air to the inside of the reactant supply bottle 22 to maintain the pressure balance in the reactant supply bottle 22.

[0072] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A real-time monitoring device for corrosion of large drainage pipes and culverts, characterized in that: include, A water intake component, one end of which is connected to the corrosion monitoring component through a pipeline, and the water intake component is used to extract sewage from a large drainage culvert and transport the sewage to the corrosion monitoring component; A pipeline at one end of the corrosion monitoring component is connected to a gas generating component. The corrosion monitoring component includes an immersion chamber and a test structure installed in the immersion chamber. The corrosion monitoring component is used to receive sewage, monitor the corrosion state of the test structure immersed in the sewage, and the gas environment data of the location of the test structure; the test structure includes a plurality of columnar channels with openings and a plurality of test blocks. The plurality of columnar channels are fixed to the inner wall of the immersion chamber. The test blocks are detachably connected to the columnar channels. The top of the columnar channels is airtightly connected with a flange. Solid colored fiberglass rods are pre-buried in the columnar channels. The diameter of the solid colored fiberglass rods is 1mm-3mm. Several solid colored fiberglass rods are pre-buried in a single test block. The solid colored fiberglass rods are used to evaluate the corrosion degree of the steel bar protective layer of a large drainage culvert. The gas generating component is used to input the corrosive gas into the immersion chamber according to the gas environment data to adjust the corrosive gas parameters in the immersion chamber.

2. A large-scale drainage pipe culvert corrosion condition real-time monitoring device according to claim 1, characterized in that: The water intake component is a variable frequency sewage pump, the input end of which is electrically connected to an external power supply, and the variable frequency sewage pump includes a water pump and a variable frequency speed regulator; A stainless steel filter is installed at the water inlet of the water pump; The water pump pipeline is connected to the soaking chamber, and an electromagnetic flowmeter is installed on the connecting pipeline between the water pump and the soaking chamber. The electromagnetic flowmeter is used to measure the flow rate of sewage flowing into the soaking chamber.

3. A real-time monitoring device for corrosion status of a large drainage culvert according to claim 2, characterized in that: The corrosion monitoring component includes a controller, a signal input pin of the controller is connected to a first data acquisition module, and the first data acquisition module is used to collect the gas concentration generated by sewage in a large drainage culvert; The signal input pin of the controller is connected to a second data acquisition module, and the second data acquisition module is used to collect the temperature of the sewage inside the corrosion monitoring component and the humidity data of the gas above the sewage; The signal input pin of the controller is connected to a third data acquisition module, and the third data acquisition module is used to collect the pH value, total organic carbon concentration value and chemical oxygen demand value of the sewage in the soaking chamber; The signal input pin of the controller is connected to a fourth data acquisition module, and the fourth data acquisition module is used to detect the flow rate and flow velocity of sewage in the large drainage culvert.

4. A real-time monitoring device for corrosion of a large drainage culvert according to claim 3, characterized in that: The first data acquisition module includes an integrated methane gas concentration sensor, a hydrogen sulfide gas concentration sensor and a carbon dioxide gas concentration sensor, the methane gas concentration sensor is used to detect the methane gas concentration above the sewage in the large drainage culvert, the hydrogen sulfide gas concentration sensor is used to detect the hydrogen sulfide gas concentration above the sewage in the large drainage culvert, and the carbon dioxide gas concentration sensor is used to detect the carbon dioxide gas concentration above the sewage in the large drainage culvert; The second data acquisition module includes a temperature sensor and a humidity sensor, wherein the temperature sensor is used to collect temperature data of sewage in the large drainage culvert, and the humidity sensor is used to collect humidity data of the gas above the sewage inside the large drainage culvert; The third data acquisition module includes a pH sensor, a TOC sensor and a COD sensor. The pH sensor is used to collect pH value data of the sewage in the soaking chamber, and convert the pH value data into a digital signal and send it to the processor. The TOC sensor is used to collect the total organic carbon data value of the sewage in the soaking chamber, and convert the total organic carbon data value into a digital signal and send it to the processor. The COD sensor is used to collect the chemical oxygen demand value in the sewage; The fourth data acquisition module is an ultrasonic flow and velocity meter, which is used to measure the flow and velocity of sewage in large drainage culverts using ultrasonic waves.

5. A real-time monitoring device for corrosion status of a large drainage culvert according to claim 4, characterized in that: The test block comprises one or more of a reinforced concrete block, a prestressed concrete block and a high-strength block. The immersion cavity is a concrete pipe with a hollow interior. Both the cross section and the longitudinal section of the immersion cavity are rectangular.

6. A real-time monitoring device for corrosion status of a large drainage culvert according to claim 5, characterized in that: A ceramic sheet is attached to the inner wall of the immersion chamber, and the ceramic sheet is an alumina ceramic sheet. An annular slice is clamped on the inner wall of the immersion chamber, and the annular slice is a partial section of a large drainage culvert. A liquid level meter is installed at one end of the immersion chamber. The liquid level meter is used to collect the liquid level height data of the sewage in the immersion chamber and send the collected height data to the processor.

7. A real-time monitoring device for corrosion of a large drainage culvert according to claim 6, characterized in that: The gas generating assembly comprises a gas generating chamber, a magnetic stirrer and a reactant supply bottle installed inside the gas generating chamber, a reaction bottle is placed on the top of the magnetic stirrer, a reactant supply bottle pipeline is connected to the reaction bottle, a peristaltic pump is installed on the pipeline between the reactant supply bottle and the reaction bottle, and the peristaltic pump is used to provide the reactant in the reactant supply bottle to the reaction bottle for reaction to generate corrosive gas; One end of the peristaltic pump is electrically connected to the first gas generation control module, and the output end of the first gas generation control module is electrically connected to the electromagnetic switch valve, which is used to control the on-off of the gas from the reaction bottle into the immersion chamber; The output end of the first gas generation control module is electrically connected to the second gas generation control module, and the first gas generation control module is used to collect the gas generation signal generated by the reaction in the reaction bottle and send the gas generation signal to the controller; The second gas generation amount control module is used to collect the gas amount signal in the immersion chamber and send the gas amount signal to the controller.

8. A real-time monitoring device for corrosion of a large drainage pipe culvert according to claim 7, characterized in that: An electric heating plate and a temperature control module are embedded in the top of the magnetic stirrer. The magnetic stirrer is used to accelerate the reaction process and control the reaction temperature. The electric heating plate is used to heat the reaction solution in the reaction bottle. The lower end of the reactant supply bottle is connected to a one-way valve. The one-way valve is used to supply air to the inside of the reactant supply bottle to maintain pressure balance in the reactant supply bottle.

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