Steel box girder inner surface state monitoring method and device and medium

Abstract

The invention discloses a method and device for monitoring the state of the inner surface of a steel box girder and a medium. The method comprises the steps that the environment temperature T and the relative humidity RH in the steel box girder are obtained; obtaining a dew point temperature Tdp based on the environment temperature T and the relative humidity RH; obtaining the inner surface temperature Tsteel of a target monitoring area on the inner surface of the steel box girder; based on the inner surface temperature Tsteel and the dew point temperature Tdp, whether the target monitoring area is dewed or not is judged; when the target monitoring area is about to be dewed or dewed, the corrosion state of the target monitoring area on the inner surface of the steel box girder is obtained based on the fitted corrosion rate formula, the state of the inner surface of the steel box girder can be automatically obtained in real time, and the technical problem that the state of the inner surface of the steel box girder cannot be obtained in time in the prior art is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion monitoring of steel box girders, and particularly to a method, device and medium for monitoring the inner surface state of a steel box girder. Background Art

[0002] A steel box girder is a common bridge structure form, mainly made of steel, with a box-shaped structure in appearance. The main function of the steel box girder is to serve as the main structure of the bridge and bear various loads.

[0003] The steel box girder is not a completely enclosed box structure. Since it is connected to the outside world, the humidity inside is relatively high. Especially for steel box girders exposed to a working environment with high humidity such as the marine environment, they are extremely susceptible to the influence of temperature and humidity changes, and dew condensation is likely to occur on the inner surface. Dew condensation will cause water droplets to form on the steel surface, which will then lead to corrosion, thus affecting the service life and structural safety of the steel.

[0004] In the prior art, physical or chemical anti-corrosion measures are generally adopted. For example, various coatings are applied on the surface of the steel box girder to prevent corrosion of the steel box girder. However, the service life of the anti-corrosion coating is limited, and multiple recoatings are required during the service life cycle of the steel box girder. At the same time, the interior of the steel box girder is complex and the space is narrow. The coating process effect on the inner surface of the steel box girder is not as good as that on the outer surface, and recoating is also impossible after the service life expires. Therefore, it is of great significance to timely obtain the state of the inner surface of the steel box girder and know whether it is corroded. Summary of the Invention

[0005] By providing a method, device, system and medium for monitoring the inner surface state of a steel box girder, embodiments of the present application solve the technical problem in the prior art that the inner surface state of a steel box girder cannot be obtained in a timely manner.

[0006] To solve the above technical problem, in a first aspect, embodiments of the present application provide a method for monitoring the inner surface state of a steel box girder, the method including:

[0007] Obtain the ambient temperature T and relative humidity RH inside the steel box girder;

[0008] Obtain the dew point temperature T dp ;

[0009] Obtain the inner surface temperature T steel of the target monitoring area on the inner surface of the steel box girder;

[0010] Based on the inner surface temperature T steel and the dew point temperature T dp judge whether the target monitoring area is dew-condensed;

[0011] When the target monitoring area is about to condense or has already condensed, obtain the corrosion state of the target monitoring area on the inner surface of the steel box girder based on the fitted corrosion rate formula.

[0012] Further, obtain the dew point temperature T based on the ambient temperature T and the relative humidity RH dp Specifically, it includes:

[0013]

[0014] Where: a is an empirical constant, and b is the temperature offset.

[0015] Further, based on the inner surface temperature T steel And the dew point temperature T dp Judging whether the target monitoring area is condensing specifically includes:

[0016] If T dp ≥T steel , then the target monitoring area on the inner surface of the steel box girder is about to condense or has already condensed;

[0017] If T dp <T steel , then the target monitoring area on the inner surface of the steel box girder is not condensing.

[0018] Further, obtaining the corrosion state of the target monitoring area on the inner surface of the steel box girder based on the corrosion rate formula specifically includes:

[0019] The fitted corrosion rate formula is v corr =0.01·ΔT 1.5 ·RH 0.2 , where v corr Is the corrosion rate, with the unit of mm / y; ΔT = T dp -T steel , with the unit of °C;

[0020] When v corr >0, judge that the target monitoring area on the inner surface of the steel box girder has corroded, and the larger v corr The faster the corrosion; conversely, when v corr ≤0, judge that the target monitoring area on the inner surface of the steel box girder has not corroded.

[0021] Further, when the target monitoring area is about to condense or has already condensed, after judging whether the target monitoring area on the inner surface of the steel box girder has corroded based on the corrosion rate formula, it further includes:

[0022] When the target monitoring area on the inner surface of the steel box girder corrodes, send an alarm command to the alarm.

[0023] In a second aspect, an embodiment of the present application further provides a device for monitoring the corrosion of the outer surface of a steel box girder. The device includes:

[0024] A first acquisition module, adapted to acquire the ambient temperature T and relative humidity RH inside the steel box girder;

[0025] A second acquisition module, adapted to acquire the dew point temperature T based on the ambient temperature T and the relative humidity RH dp ;

[0026] A third acquisition module, adapted to acquire the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder steel ;

[0027] A judgment module, adapted to judge whether the target monitoring area is dew condensation based on the inner surface temperature T steel and the dew point temperature T dp ;

[0028] A fourth acquisition module, adapted to acquire the corrosion state of the target monitoring area on the inner surface of the steel box girder based on the corrosion rate formula when the target monitoring area is about to dew or has already dew condensed.

[0029] In a third aspect, an embodiment of the present application further provides a device for monitoring the inner surface state of a steel box girder, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the method described in any item of the first aspect is implemented.

[0030] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the method described in any item of the first aspect is implemented.

[0031] In a fifth aspect, an embodiment of the present application further provides a device for monitoring the inner surface state of a steel box girder. The device includes:

[0032] A temperature and humidity sensor, arranged inside the steel box girder, for acquiring the ambient temperature T and relative humidity RH inside the steel box girder;

[0033] A temperature sensor, arranged inside the steel box girder for acquiring the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder steel ;

[0034] An alarm, for giving an alarm;

[0035] A controller, the signal input end of the controller is respectively connected to the temperature and humidity sensor and the temperature sensor, and is used to receive the ambient temperature T and relative humidity RH obtained by the temperature and humidity sensor, and the inner surface temperature T obtained by the temperature sensor steel , the signal output end of the controller outputs a control signal, and the control signal is used to control the alarm

[0036] Furthermore, the device further includes:

[0037] A magnetic adsorption device, which is used to adsorb on the inner surface of the steel box girder, so that the device is fixed on the inner surface of the steel box girder

[0038] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0039] (1) In the embodiment of the present application, the ambient temperature T and relative humidity RH inside the steel box girder are obtained; the dew point temperature T is obtained based on the ambient temperature T and the relative humidity RH dp ; the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder is obtained steel ; based on the inner surface temperature T steel and the dew point temperature T dp to judge whether the target monitoring area is dew condensation; when the target monitoring area is about to dew or has already dew, the corrosion state of the target monitoring area on the inner surface of the steel box girder is obtained based on the fitted corrosion rate formula, which can automatically and real-time obtain the inner surface state of the steel box girder, effectively solving the technical problem that the inner surface state of the steel box girder cannot be obtained in time in the prior art

[0040] (2) Although the relative humidity sensor can directly measure the air humidity, it cannot accurately know whether the steel surface is dew condensation, because the steel surface is greatly affected by the ambient temperature, humidity and its own heat conduction characteristics. Therefore, relying solely on the humidity sensor cannot accurately detect the dew condensation phenomenon in extreme weather or large temperature differences. In the embodiment of the present application, the dew point is calculated comprehensively by the ambient temperature T and the relative humidity RH, which can cope with different environmental conditions (such as high humidity, high temperature or low temperature environment), with higher accuracy, stronger adaptability and a wider application scenario

[0041] (3) The corrosion of steel caused by dew condensation is a gradual and continuous process, which often occurs in the case of high humidity or large temperature differences. The relative humidity sensor simply provides environmental humidity data and cannot fully reflect these potential risks. In the embodiment of the present application, the dew point temperature is calculated in real time and combined with the steel surface temperature to judge the dew condensation conditions, which can detect and give an early warning in time at the initial stage of dew condensation, reduce the corrosion risk and extend the service life of the steel

[0042] (4) During the entire life cycle of the steel box girder, the method, device, system, and medium described in the embodiments of the present application can not only monitor whether condensation corrosion occurs on the surface of the steel box girder, but also map the corrosion degree of the steel box girder according to each condensation situation. During the 100-year life cycle of the steel box girder, multiple condensations are bound to occur. The embodiments of the present application can accumulate and analyze the corrosion data obtained from each condensation successively, so as to accurately judge the corrosion situation of the steel box girder and whether it still meets the requirements for safe use, providing a reliable basis for bridge maintenance personnel.

[0043] (5) The method, device, system, and medium described in the embodiments of the present application can collect data for the anti-corrosion management of steel box girders, enabling the anti-corrosion management of steel box girders to analyze the corrosion data of steel box girders and quickly master the solutions to the corrosion problems of steel box girders nationwide or regionally; it is beneficial to the related industries of steel box girders, enabling them to develop related products in advance or targeted, so as to better achieve the anti-corrosion of steel box girders.

[0044] (6) The device described in the embodiments of the present application is adsorbed and fixed on the inner surface of the steel box girder by setting a magnetic adsorption device, without the need to set other connecting components, and any fixed position can be selected, which is convenient for arranging in various parts of the steel box girder, such as the top plate, bottom plate, web plate, diaphragm plate, etc. Data monitoring can be carried out at any part inside the steel box girder, which is very convenient and easy to use. Description of the Drawings

[0045] Figure 1 It is a schematic structural diagram of a device for monitoring the inner surface state of a steel box girder in an embodiment of the present invention;

[0046] Figure 2 It is a schematic flow diagram of a method for monitoring the inner surface state of a steel box girder in an embodiment of the present invention;

[0047] Figure 3 It is a schematic structural diagram of another device for monitoring the inner surface state of a steel box girder in an embodiment of the present invention;

[0048] Figure 4 It is a schematic structural diagram of yet another device for monitoring the inner surface state of a steel box girder in an embodiment of the present invention;

[0049] Figure 5 It is a table for recording experimental data. Detailed Embodiments

[0050] By providing a method, device, system, and medium for monitoring the inner surface state of a steel box girder, the embodiments of the present application solve the technical problem in the prior art that the inner surface state of the steel box girder cannot be obtained in a timely manner.

[0051] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings in the specification and specific embodiments.

[0052] Example 1

[0053] As Figure 1 shown, this embodiment discloses a monitoring device for the inner surface state of a steel box girder. The device includes a housing 10, and a temperature and humidity sensor 20 and a temperature sensor 30 exposed outside the housing 10 are respectively provided on the housing 10. Among them, the temperature and humidity sensor 20 is used to obtain the ambient temperature T and relative humidity RH inside the steel box girder; the temperature sensor 30 faces the inner surface of the steel box girder and is used to obtain the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder steel .

[0054] Specifically, the temperature sensor 30 can be an infrared temperature sensor. The infrared temperature sensor can measure the temperature without contacting the object to be measured. Therefore, even without contacting the inner surface of the steel box girder, the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder can be obtained steel , as long as the monitoring end of the infrared temperature sensor faces the target monitoring area and is as close as possible to the target monitoring area. For example, the infrared temperature sensor is about 5-10 cm away from the inner surface of the steel box girder; at the same time, the infrared sensor has extremely high sensitivity and can monitor tiny temperature changes, which is suitable for the monitoring field. The housing 10 can be made by resin 3D printing

[0055] Specifically, for example, the operating voltage of the temperature and humidity sensor 20 is 3.3-5V, the humidity measurement range is 0-100%RH, the humidity measurement accuracy is ±2%RH; the temperature measurement range is -40-80°C, the temperature measurement accuracy is ±0.5°C, the response time of humidity is less than 5s, and the response time of temperature is between 6s and 20s. The operating voltage of the infrared temperature sensor is 3-5V, the temperature measurement range is -20-280°C, the temperature measurement accuracy is 0.01°C, and the distance from the measured steel is within 10 cm

[0056] The device further includes an alarm 40. The alarm 40 can be a common sound and light alarm 40, such as a buzzer, an LED alarm light, etc

[0057] A controller 50 can be arranged inside the housing 10. The signal input end of the controller 50 is respectively connected to the temperature and humidity sensor 20 and the temperature sensor 30, and is used to receive the ambient temperature T information and relative humidity RH information obtained by the temperature and humidity sensor 20, and the inner surface temperature T steel information obtained by the temperature sensor 30. The signal output end of the controller 50 outputs a control signal, and the control signal is used to control the alarm 40

[0058] It should be noted that in engineering, a dehumidification system can be installed inside the steel box girder to reduce the relative humidity inside the steel box girder, thereby achieving the purpose of active anti-corrosion. For example, the dehumidification system can be a commercially available mature product such as a dehumidifier. Therefore, the signal output terminal of the controller 50 can also be connected to the dehumidification system (dehumidifier) to output a control signal to control the start and stop of the dehumidifier. Thus, when the controller 50 recognizes that corrosion has occurred in the target monitoring area on the inner surface of the steel box girder, it sends an alarm instruction to the alarm 40 to drive the alarm 40 to sound an alarm to alert the user, and sends an activation instruction to the dehumidification system to drive the dehumidification system installed inside the steel box girder to work, so as to reduce the relative humidity inside the steel box girder, thereby reducing the corrosion rate or preventing corrosion.

[0059] In addition, for the convenience of monitoring, the controller 50 can also be connected to the monitoring platform in the remote monitoring room, and the data obtained or calculated by the controller 50 can be transmitted to the remote monitoring platform. In this way, it is convenient for the user to monitor in the monitoring room. At the same time, the monitoring platform is synchronously configured with alarm settings to facilitate obtaining alarm information in a timely manner. Of course, the controller 50 and the alarm 40 in the device can also be directly set on the remote monitoring platform, which is not limited here.

[0060] Of course, the controller can also be provided with or connected to a data storage module 60 for storing data. For example, the device updates the data every 2 seconds, collects the ambient temperature T, relative humidity RH, and inner surface temperature T steel , and stores various new relevant data (including time, ambient temperature T, relative humidity RH, dew point temperature, inner surface temperature T steel ) into the data storage module 60 (such as an SD card) for subsequent use, providing more support for later analysis and data visualization. For example, data visualization can be achieved through data collection and combined with the drawing function for more in-depth analysis, or fitting and analysis can be performed with the corrosion data under the same conditions in the laboratory.

[0061] The controller 50 can be or include an Atmel Atmega328 microcontroller. The input voltage is a 5 - 9V DC power supply. When connected to the computer USB, external power supply is not required. The output voltage is a 5V DC voltage output and a 3.3V DC voltage. The Digital 1 / 0 digital input / output terminals total 0 - 13, and the Analog l / 0 analog input / output terminals total 0 - 5. After the controller 50 is connected to the computer USB, it supports the compilation and modification of programs, controls the operation of sensors and related calculations, and supports the ISP download function.

[0062] The device also needs to be provided with a communication module. The controller 50, the temperature and humidity sensor 20, and / or the temperature sensor 30 are connected to the remote monitoring platform based on the communication module. The communication component is used to connect the controller 50 and the monitoring platform, so as to realize the communication between the monitoring platform and the device. For example, the controller 50 can communicate with an external monitoring platform through a communication component (such as wireless communication) to transmit data to the monitoring platform through the communication module. At the same time, the monitoring platform can also access and control the controller 50, the temperature and humidity sensor 20, and / or the temperature sensor 30 through the communication module to update software and / or parameters and / or read data.

[0063] Of course, the monitoring platform can be a personal computer, a laptop, a smart phone, a tablet computer, a smart speaker, a smart TV, a smart vehicle device, etc. The smart device has an application program that allows communication with the device and acts as the controller 50. The monitoring platform can be set in a remote monitoring room.

[0064] The device further includes a power module 70 disposed within the housing 10. The power module 70 can be connected to the mains power, or can be a battery, or of course a combination of both.

[0065] In addition, the device can also be provided with a display module 80. The display module 80 is used to display the judgment result of the controller 50. For example, this function can be used in the experimental scenario of the device. The display module 80 can be an LED display.

[0066] The device further includes a magnetic adsorption device 90, such as a magnet, for adsorbing on the inner surface of the steel box girder, so that the device can be conveniently fixed on the inner surface of the steel box girder, which is very convenient. Of course, to improve the stability of the device fixed on the inner surface of the steel box girder, the magnet can be a strong magnet.

[0067] Furthermore, the magnet is fixed on one of the side surfaces of the housing 10.

[0068] Embodiment 2

[0069] Figure 2 It is a schematic flowchart of a method for monitoring the inner surface state of a steel box girder in an embodiment of the present invention. The controller 50 in Embodiment 1 uses this method to identify whether corrosion occurs in the target monitoring area on the inner surface of the steel box girder, as Figure 2 shown, the method includes:

[0070] Step S100, obtaining the ambient temperature T and relative humidity RH inside the steel box girder;

[0071] Specifically, the interior of the steel box girder refers to the inner cavity of the steel box girder. The environmental temperature T and relative humidity RH are acquired by the above-mentioned temperature and humidity sensor 20.

[0072] Step S200, obtain the dew point temperature T based on the environmental temperature T and the relative humidity RH dp ;

[0073] Specifically, based on the environmental temperature T and the relative humidity RH, the dew point temperature T is obtained according to the following formula dp :

[0074] where γ(T, RH) is an intermediate function for calculating the dew point temperature T dp and a is an empirical constant related to the relationship between temperature and the influence on saturated vapor pressure, and b is the temperature offset, representing a specific reference temperature. For example, when the environmental temperature T is between -40°C and 50°C, a = 17.27 and b = 237.7; when the environmental temperature T is between 50°C and 100°C, a = 22.47 and b = 273.15.

[0075] It should be noted that although traditional relative humidity sensors can directly measure air humidity, they cannot accurately determine whether condensation occurs on the surface of steel because the surface of steel is greatly affected by environmental temperature, humidity, and its own heat conduction characteristics. Therefore, relying solely on humidity sensors cannot accurately detect condensation phenomena in extreme weather or large temperature differences. Therefore, in the embodiments of the present application, by comprehensively calculating the dew point through the environmental temperature T and the relative humidity RH, it can better cope with different environmental conditions (such as high humidity, high temperature, or low temperature environments), with higher accuracy, stronger adaptability, and a wider range of application scenarios.

[0076] In addition, the corrosion of steel by condensation is a gradual and continuous process, which often occurs under conditions of high humidity or large temperature differences. Relative humidity sensors simply provide environmental humidity data and cannot fully reflect these potential risks. However, in the embodiments of the present application, by calculating the dew point temperature in real time and combining it with the surface temperature of the steel to judge the condensation conditions, it can detect and give early warnings in the initial stage of condensation, reduce the corrosion risk, and extend the service life of the steel.

[0077] Step S300, obtain the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder steel ;

[0078] Specifically, the inner surface temperature T is obtained based on the above-mentioned temperature sensor 30 steel .

[0079] Step S400, based on the inner surface temperature T steel and the dew point temperature Tdp Determine whether the target monitoring area is dew - condensed;

[0080] Specifically, when the water vapor content in the air reaches the saturation state, if the temperature continues to decrease, the water vapor will condense into liquid water. The dew - point temperature is the temperature at which the water vapor in the air begins to condense. If the temperature of the inner surface of the steel box girder is lower than the dew - point temperature, it indicates that the air inside the steel box girder has reached the saturation state and the water vapor begins to condense into dew. When the temperature of the inner surface of the steel box girder is lower than the dew - point temperature, the water vapor in the surrounding air will migrate towards the inner surface of the steel box girder due to the temperature difference. When these water vapors come into contact with the relatively low - temperature inner surface of the steel box girder, they will quickly cool down and condense into small water droplets, forming the dew - condensation phenomenon. In addition, at a certain ambient temperature, the higher the relative humidity, the more water vapor content in the air, and the lower the temperature required to reach the saturation state, that is, the lower the dew - point temperature. When the temperature of the inner surface of the steel box girder is lower than this lower dew - point temperature, the dew - condensation phenomenon is more likely to occur.

[0081] Therefore, if T steel >T dp , then there is no dew - condensation on the target monitoring area on the inner surface of the steel box girder; conversely, if T steel ≤T dp , then the target monitoring area on the inner surface of the steel box girder is about to be dew - condensed or has already been dew - condensed.

[0082] Step S500, when the target monitoring area is about to be dew - condensed or has already been dew - condensed, obtain the corrosion state of the target monitoring area on the inner surface of the steel box girder based on the fitted corrosion rate formula.

[0083] Specifically, the fitted corrosion rate formula is: v corr =0.01·ΔT 1.5 ·RH 0.2 , where v corr is the corrosion rate, with the unit of mm / y; ΔT = T dp - T steel , with the unit of °C;

[0084] When v corr >0, it is determined that the target monitoring area on the inner surface of the steel box girder has been corroded, and the larger v corr is, the faster the corrosion; conversely, when v corr ≤0, it is determined that the target monitoring area on the inner surface of the steel box girder has not been corroded. Users can use the stored data for long - term analysis, trend analysis, and report generation of the corrosion degree of the steel box girder surface.

[0085] It should be noted that the above - fitted corrosion rate formula: v corr =0.01·ΔT 1.5 ·RH0.2 can be obtained in the following way:

[0086] The corrosion rate v corr The relationship with the temperature difference ΔT can be obtained by fitting laboratory data: In a humid environment, corrosion is affected by the condensation phenomenon, and the occurrence of condensation depends on the dew point temperature T dp and the temperature T of the inner surface of the steel box girder steel The temperature difference ΔT, when ΔT is large, that is, T dp > T steel , a condensed water film will form on the steel surface, and the larger the temperature difference, the thicker the condensed water film, and the longer the duration of the corrosion reaction, so the corrosion rate v corr is faster. Therefore, there is a relationship between the corrosion rate and the temperature difference: v corr ∝ΔT n .

[0087] In addition, relative humidity also affects the formation of the water film on the metal surface. In a high-humidity environment, the surface is more likely to remain wet, providing electrolyte conditions for the corrosion reaction. Therefore, there is a relationship between the corrosion rate and relative humidity: v corr ∝RH m .

[0088] The temperature difference ΔT and relative humidity RH are two relatively independent factors in the atmospheric corrosion environment. They respectively affect the condensation on the metal surface and the formation of the electrolyte layer. Since these two factors do not directly replace each other, their effects are synergistic. Therefore, the corrosion rate occurs under the synergistic action of the temperature difference ΔT and relative humidity RH, that is, the relationship can be obtained as: v corr ∝ΔT n ·RH m .

[0089] Under the experimental conditions of different environmental temperatures and relative humidities, set the surface temperature and dew point temperature of the steel used for the steel box girder, and keep other conditions (such as the surface treatment of the steel) unchanged. Control the temperature and humidity in the experimental chamber, use a water bath to control the temperature of the steel surface, and measure the temperature difference ΔT and corrosion rate v under each group of experimental conditions through an electrochemical measurement device corr . Record the experimental data such as the surface temperature of the steel, the environmental dew point temperature, and the corrosion rate v corr in each group of experiments. Some of the data are as shown in Figure 5 .

[0090] According to Figure 5 the data shown, v corr = A·ΔT n ·RH mThe specific corrosion rate formula, where A and n are experimental coefficients to be determined, and A is a constant, reflecting the environmental conditions and the corrosion sensitivity of the steel used in the steel box girder. n is an exponent determined by fitting experimental data, representing the degree of influence of the temperature difference ΔT on the corrosion rate. m is the influence exponent of environmental humidity on the corrosion rate, which is also determined by experimental data.

[0091] According to the above experimental data, the non-linear regression method is used to fit the equation v corr = A·ΔT n ·RH m , and finally A = 0.01, n = 1.5, m = 0.2 are obtained. In this way, the above corrosion rate formula can be obtained as: v corr = 0.01·ΔT 1.5 ·RH 0.2 .

[0092] This corrosion rate formula shows that the relationship between the corrosion rate and the temperature difference ΔT is non-linear, and the coupled influence of the temperature difference ΔT and humidity causes the corrosion rate to increase rapidly.

[0093] Step S600, when corrosion has occurred in the target monitoring area on the inner surface of the steel box girder, send an alarm instruction to the alarm 40 and send an opening instruction to the dehumidification system.

[0094] Specifically, the alarm 40 emits an alarm sound and / or an optoelectronic signal to remind the staff, and the dehumidification system installed inside the steel box girder is turned on to reduce the relative humidity inside the steel box girder, so as to reduce the corrosion rate or prevent corrosion.

[0095] Therefore, in the entire life cycle of the steel box girder in this application embodiment, not only can it monitor whether condensation corrosion occurs on the surface of the steel box girder, but also it can map the corrosion degree of the steel box girder according to each condensation situation. During the 100-year life cycle of the steel box girder, there will surely be multiple condensations. By accumulating and analyzing the corrosion data obtained from each condensation in this application, the corrosion situation of the steel box girder can be accurately judged, whether it still meets the requirements for safe use, providing a reliable basis for bridge maintenance personnel.

[0096] Embodiment 3

[0097] Based on the same inventive concept as the method for monitoring the inner surface state of a steel box girder in the foregoing embodiment, the present invention also provides a device for monitoring the inner surface state of a steel box girder, as Figure 3 shown, the device includes:

[0098] The first acquisition module 11 is adapted to acquire the environmental temperature T and relative humidity RH inside the steel box girder;

[0099] A second acquisition module 12, adapted to acquire a dew point temperature T based on the environmental temperature T and the relative humidity RH dp ;

[0100] A third acquisition module 12, adapted to acquire an inner surface temperature T of a target monitoring area on the inner surface of the steel box girder steel ;

[0101] A judgment module 14, adapted to judge whether condensation occurs in the target monitoring area based on the inner surface temperature T steel and the dew point temperature T dp ;

[0102] A fourth acquisition module 15, adapted to acquire a corrosion state of a target monitoring area on the inner surface of the steel box girder based on a corrosion rate formula when condensation is about to occur or has occurred in the target monitoring area

[0103] Embodiment 4

[0104] Based on the same inventive concept as a method for monitoring the inner surface state of a steel box girder in the foregoing embodiments, the present invention further provides a device for monitoring the inner surface state of a steel box girder, on which a computer program is stored, and when the program is executed by a processor, the steps of any of the methods for monitoring the inner surface state of a steel box girder described above are implemented

[0105] Among them, in Figure 4 , a bus architecture (represented by a bus 300), the bus 300 may include any number of interconnected buses and bridges, and the bus 300 links various circuits including one or more processors represented by a processor 302 and a memory represented by a memory 304 together. The bus 300 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and therefore, further description thereof will not be given herein. A bus interface 306 provides an interface between the bus 300 and a receiver 301 and a transmitter 303. The receiver 301 and the transmitter 303 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices on a transmission medium

[0106] The processor 302 is responsible for managing the bus 300 and general processing, while the memory 304 may be used to store data used by the processor 302 when performing operations

[0107] Embodiment 5

[0108] Based on the same inventive concept as a method for monitoring the inner surface state of a steel box girder in the foregoing embodiments, the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following steps are implemented

[0109] Obtain the ambient temperature T and relative humidity RH inside the steel box girder;

[0110] Obtain the dew point temperature T based on the ambient temperature T and the relative humidity RH dp ;

[0111] Obtain the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder steel ;

[0112] Based on the inner surface temperature T steel and the dew point temperature T dp Judge whether the target monitoring area is dew condensation;

[0113] When the target monitoring area is about to dew or has already dewed, obtain the corrosion state of the target monitoring area on the inner surface of the steel box girder based on the corrosion rate formula;

[0114] When corrosion has occurred in the target monitoring area on the inner surface of the steel box girder, send an alarm instruction to the alarm 40 and send an opening instruction to the dehumidification system.

[0115] Those skilled in the art should understand that the various technologies described here can be implemented in combination with hardware or software, or a combination of them. Thus, the method and device of the embodiments of the present invention, or certain aspects or parts of the method and device of the embodiments of the present invention, can take the form of program code (i.e., instructions) embedded in a tangible medium, such as a removable hard disk, a USB flash drive, a floppy disk, a CD-ROM, or any other machine-readable storage medium. When the program is loaded into a machine such as a computer and executed by the machine, the machine becomes a device for practicing the embodiments of the present invention.

[0116] In the case where the program code is executed on a programmable computer, the computing device generally includes a processor, a processor-readable storage medium (including volatile and non-volatile memories and / or storage elements), at least one input device, and at least one output device. Among them, the memory is configured to store the program code; the processor is configured to execute the method of the embodiments of the present invention according to the instructions in the program code stored in the memory.

[0117] By way of example and not limitation, the readable medium includes a readable storage medium and a communication medium. The readable storage medium stores information such as computer-readable instructions, data structures, program modules, or other data. The communication medium generally embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and includes any information transmission medium. A combination of any of the above is also included within the scope of the readable medium.

[0118] In the specification provided herein, the algorithms and displays are not inherently related to any particular computer, virtual system, or other device. A variety of general-purpose systems may also be used in conjunction with the examples of the embodiments of the present invention. From the above description, the structure required to construct such systems will be apparent. In addition, the embodiments of the present invention are not directed to any particular programming language. It should be understood that the content of the embodiments of the present invention described herein can be implemented using various programming languages, and the description of a particular language above is for the purpose of disclosing the implementation manners of the embodiments of the present invention.

[0119] In the specification provided herein, a number of specific details are set forth. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0120] Similarly, it should be understood that, in order to streamline this disclosure and assist in understanding one or more of the various inventive aspects, in the foregoing description of the exemplary embodiments of the present invention, the various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed method should not be construed as reflecting an intention that the claimed embodiments of the present invention require more features than are expressly recited in each claim. Rather, as reflected in the following claims, the inventive aspects lie in less than all of the features of the single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the present invention.

[0121] Those skilled in the art should understand that the modules, units, or components of the devices in the examples disclosed herein may be arranged in the devices as described in this embodiment, or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or further divided into multiple sub-modules.

[0122] Those skilled in the art can understand that the modules in the devices in the embodiments can be adaptively changed and set in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and in addition, they can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, any combination can be adopted to combine all the features disclosed in this specification (including the accompanying claims, abstract and drawings) and all the processes or units of any method or device so disclosed. Unless otherwise clearly stated, each feature disclosed in this specification (including the accompanying claims, abstract and drawings) can be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0123] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the embodiments of the present invention and forms different embodiments. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

[0124] In addition, some of the above embodiments are described herein as a combination of methods or method elements that can be implemented by a processor of a computer system or by other devices performing the above functions. Therefore, a processor having the necessary instructions for implementing the above methods or method elements forms a device for implementing the methods or method elements. In addition, the elements described herein in the device embodiments are examples of the following devices: the device is used to implement the functions performed by the elements for the purpose of implementing the present invention.

[0125] As used herein, unless otherwise specified, the use of ordinal numbers "first", "second", "third", etc. to describe ordinary objects only indicates different instances of similar objects, and does not intend to imply that the objects so described must have a given order in terms of time, space, sorting, or in any other way.

[0126] Although embodiments of the present invention are described in terms of a limited number of embodiments, those skilled in the art within this technical field will appreciate that other embodiments can be contemplated within the scope of the embodiments of the present invention as thus described. In addition, it should be noted that the language used in this specification has been principally selected for readability and instructional purposes and not for the purpose of explaining or limiting the subject matter of the embodiments of the present invention. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. For the scope of the embodiments of the present invention, the disclosure of the embodiments of the present invention is illustrative rather than restrictive, and the scope of the embodiments of the present invention is defined by the appended claims.

Claims

1. A method for monitoring the inner surface condition of a steel box girder, characterized in that: The method comprises: Obtaining the ambient temperature T and relative humidity RH inside the steel box girder; Dew point temperature T is obtained based on the ambient temperature T and the relative humidity RH dp ; Obtain the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder steel ; Based on the inner surface temperature T steel and the dew point temperature T dp Determining whether condensation occurs in the target monitoring area; When condensation is about to occur or has occurred in the target monitoring area, the corrosion state of the target monitoring area on the inner surface of the steel box girder is obtained based on a fitted corrosion rate formula.

2. A method for monitoring the inner surface condition of a steel box girder according to claim 1, characterized in that: The dew point temperature T is obtained based on the ambient temperature T and the relative humidity RH dp Specifically include: Where: a is the empirical constant and b is the temperature offset.

3. A method for monitoring the inner surface condition of a steel box girder according to claim 1, characterized in that: Based on the inner surface temperature T steel and the dew point temperature T dp Determining whether condensation occurs in the target monitoring area specifically includes: If T dp ≥T steel , then the target monitoring area on the inner surface of the steel box girder is about to condense or has condensed; If T dp <T steel , there is no condensation in the target monitoring area on the inner surface of the steel box girder.

4. A method for monitoring the inner surface condition of a steel box girder according to claim 3, characterized in that: The step of obtaining the corrosion state of the target monitoring area on the inner surface of the steel box girder based on the corrosion rate formula specifically includes: The corrosion rate formula fitted is v corr =0.01·ΔT 1.5 RH 0.2 , where v corr is the corrosion rate, in mm / y; ΔT = T dp -T steel , unit is ℃; When v corr >0, it is judged that the target monitoring area on the inner surface of the steel box girder has been corroded, and v corr The larger the value, the faster the corrosion; on the contrary, when v corr When ≤0, it is determined that no corrosion occurs in the target monitoring area on the inner surface of the steel box girder.

5. A method for monitoring the inner surface condition of a steel box girder according to claim 3, characterized in that: When condensation is about to occur or has occurred in the target monitoring area, after judging whether corrosion occurs in the target monitoring area on the inner surface of the steel box girder based on the corrosion rate formula, the method further includes: When corrosion occurs in the target monitoring area on the inner surface of the steel box girder, an alarm instruction is sent to the alarm device.

6. A method and device for monitoring corrosion on the outer surface of a steel box girder, characterized in that: The device comprises: A first acquisition module is adapted to acquire the ambient temperature T and relative humidity RH in the steel box girder; The second acquisition module is adapted to acquire the dew point temperature T based on the ambient temperature T and the relative humidity RH dp ; The third acquisition module is adapted to acquire the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder. steel ; The judgment module is adapted to determine the temperature of the inner surface based on the inner surface temperature T steel and the dew point temperature T dp Determining whether condensation occurs in the target monitoring area; The fourth acquisition module is adapted to acquire the corrosion state of the target monitoring area on the inner surface of the steel box girder based on the corrosion rate formula when the target monitoring area is about to condense or has condensed.

7. A device for monitoring the inner surface condition of a steel box beam, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

9. A device for monitoring the inner surface condition of a steel box girder, characterized in that: The device comprises: A temperature and humidity sensor is arranged in the steel box girder and is used to obtain the ambient temperature T and relative humidity RH in the steel box girder; The temperature sensor is arranged in the steel box girder to obtain the inner surface temperature T of the target monitoring area on the inner surface of the steel box girder. steel ; Alarm, used for alarm; A controller, wherein the signal input end of the controller is connected to the temperature and humidity sensor and the temperature sensor respectively, and is used to receive the ambient temperature T and relative humidity RH obtained by the temperature and humidity sensor, and the inner surface temperature T obtained by the temperature sensor. steel The signal output end of the controller outputs a control signal, and the control signal is used to control the alarm.

10. A steel box girder inner surface condition monitoring device as claimed in claim 9, characterized in that: The device also includes: The magnetic adsorption device is used for adsorbing on the inner surface of the steel box girder, so that the device is fixed on the inner surface of the steel box girder.

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