A high temperature resistance testing device for highway bridge subgrade

Abstract

The present invention relates to the technical field of high temperature resistance detection of roadbed, and specifically to a high temperature resistance detection device for roadbed of highway bridges. The device includes a simulation pressurization module, which includes a data acquisition module, a data calculation chip and a duration adjustment module; the data calculation chip analyzes and processes the temperature data collected in real time by the data acquisition module to obtain the temperature influence index of each roadbed block at the current moment; the degree of change of the temperature data of the roadbed block is adjusted in combination with the difference in the temperature influence index of each roadbed block and all roadbed blocks, the duration adjustment coefficient of the roadbed block at the current moment is obtained, and the duration adjustment coefficient is used to control the heating duration of the next heating of the roadbed surface by the simulation pressurization module after the current moment through the duration adjustment module. The present invention can better simulate the temperature change of the roadbed caused by vehicle driving.

Description

Technical Field

[0001] The invention relates to the technical field of high temperature resistance detection of roadbed, and in particular to a high temperature resistance detection device for a highway bridge roadbed. Background Art

[0002] After the construction of highway bridges is completed, it is generally necessary to test their hardness, bearing capacity, high temperature resistance, etc., especially for asphalt pavement. As asphalt is easy to soften under high temperature conditions, vehicles driving on the surface for a long time can easily cause the road surface to sink. Therefore, it is necessary to conduct high temperature resistance tests on the roadbed of highway bridges.

[0003] When the existing device performs high temperature resistance testing on the roadbed, the hydraulic cylinder drives the load-bearing block to contact the road surface, and the heating pipe is connected to evenly heat the road surface. However, the friction between the vehicle and the roadbed will generate instantaneous high temperature; the existing device cannot well simulate the temperature change of the roadbed when the vehicle is driving when heating the road surface, so that the test result has a certain deviation from the actual result, thereby affecting the detection effect of the roadbed high temperature resistance detection device. Summary of the invention

[0004] In order to solve the technical problem that the friction between the vehicle and the roadbed will generate instantaneous high temperature, resulting in errors in the high temperature resistance detection of the roadbed, the purpose of the present invention is to provide a high temperature resistance detection device for highway bridge roadbed, and the technical scheme adopted is as follows:

[0005] A road bridge subgrade high temperature resistance detection device, comprising a road subgrade high temperature resistance detection device, the road subgrade high temperature resistance detection device comprising a simulation pressurization module, the simulation pressurization module is installed in the road subgrade high temperature resistance detection device body, the simulation pressurization module comprises: a data acquisition module, a data calculation chip and a time adjustment module;

[0006] The data acquisition module is connected to the signal input end of the data calculation chip, and the signal output end of the data calculation chip is connected to the duration adjustment module, and the duration adjustment module is used to adjust the heating duration of the roadbed surface by the simulated pressurization module; the data acquisition module is used to collect temperature data of each roadbed block at different times within a set time period, and transmit the data to the data calculation chip; the last time within the set time period is the current time;

[0007] The data calculation chip is used to select the analysis time of each roadbed block from a set time period; according to the difference between the change trend of the temperature data of all analysis times of each roadbed block and the change trend of the temperature data of the analysis time in the local time period of each analysis time, as well as the temperature data of all analysis times, the temperature influence index of each roadbed block at the current time is obtained;

[0008] According to the difference between the temperature influencing index of each roadbed block and all roadbed blocks, the degree of change of the temperature data of each roadbed block during the analysis time period is adjusted to obtain the duration adjustment coefficient of each roadbed block at the current moment; based on the duration adjustment coefficient of all roadbed blocks, the duration of heating of the roadbed surface for the next time after the current moment is controlled by the duration adjustment module through the simulation pressurization module.

[0009] Furthermore, the method for obtaining the temperature impact index of each roadbed block at the current moment includes:

[0010] A two-dimensional coordinate system is established with time as the horizontal axis and temperature data as the vertical axis; the temperature data of each roadbed block at all analysis moments within a set time period are marked in the two-dimensional coordinate system to obtain the coordinate points at the corresponding moments; a straight line is fitted to all the coordinate points in the two-dimensional coordinate system, and the slope of the fitted straight line is recorded as the overall temperature change degree of each roadbed block; a straight line is fitted to the coordinate points corresponding to all analysis moments in the local time period of each analysis moment of each roadbed block in the two-dimensional coordinate system, and the slope of the fitted straight line is recorded as the local temperature change degree of each analysis moment of each roadbed block;

[0011] The concentrated value of the temperature data at all times in the local time period of each analysis moment of each roadbed block is recorded as the concentrated temperature value of each roadbed block;

[0012] According to the difference between the temperature data of each roadbed block at each analysis moment and the temperature concentration value, and the difference between the local temperature variation and the overall temperature variation, the temperature local influence index of each roadbed block at each analysis moment is obtained;

[0013] The centralized values ​​of the temperature local impact index of each roadbed block at all analysis moments within a set time period are normalized to obtain the temperature impact index of each roadbed block at the current moment.

[0014] Furthermore, the method for obtaining the duration adjustment coefficient of each roadbed block at the current moment includes:

[0015] Selecting a target block at the current moment from all roadbed blocks based on the temperature impact index; taking the extreme difference of the temperature data of each target block at all moments in the analysis time period as the temperature difference of each target block at the current moment;

[0016] The temperature difference is adjusted by using the difference between the temperature impact index of each target block and all roadbed blocks, and the duration adjustment coefficient of each target block at the current moment is obtained.

[0017] Furthermore, the method of controlling the heating time of the next heating of the roadbed surface by the simulation pressurization module after the current moment based on the time adjustment coefficient of all roadbed blocks through the time adjustment module includes:

[0018] The standard heating duration is weighted by using the difference between the concentrated value of the duration adjustment coefficient of all roadbed blocks and the constant 1 to obtain the corrected heating duration of the simulated pressurization module at the current moment;

[0019] The time period between the current moment and the start moment of the next heating of the roadbed surface by the simulated pressurization module is recorded as the test time period of the simulated pressurization module; the centralized value of the corrected heating duration of the simulated pressurization module at all moments within the test time period is used as the heating duration of the next heating of the roadbed surface by the simulated pressurization module after the current moment.

[0020] Furthermore, the method of selecting the analysis time of each roadbed block within a set time period includes:

[0021] The maximum value of the temperature data of each roadbed block at all times within a set time period is obtained, and the time corresponding to each of the maximum values ​​is recorded as the analysis time of each roadbed block.

[0022] Furthermore, the method of using the difference between the temperature impact index of each target block and all roadbed blocks to adjust the temperature difference and obtain the duration adjustment coefficient of each target block at the current moment includes:

[0023] The absolute value of the difference between the temperature impact index of each target block and the concentrated value of all temperature impact indexes of all roadbed blocks is negatively correlated to obtain the reliability coefficient of each target block; the temperature difference is weighted by using the reliability coefficient to obtain the weighted difference value of each target block; the ratio of the weighted difference value to the preset standard temperature change value is normalized to obtain the duration adjustment coefficient of each target block at the current moment.

[0024] Furthermore, the method of selecting the target block at the current moment from all roadbed blocks based on the temperature impact index includes:

[0025] For the temperature influence indexes of all roadbed blocks at the current moment, the roadbed block corresponding to the temperature influence index greater than a preset influence threshold is used as the target block at the current moment.

[0026] Furthermore, the duration of the set time period is longer than the duration of the analysis time period.

[0027] Furthermore, the method for performing straight line fitting for all coordinate points in the two-dimensional coordinate system is the least squares method.

[0028] Furthermore, the preset impact threshold is 0.68.

[0029] The present invention has the following beneficial effects:

[0030] In the present invention, a simulation pressurization module is deployed on the roadbed high temperature resistance detection device, wherein the simulation pressurization module is used to simulate the temperature change of the roadbed during vehicle driving, and the data acquisition module collects the temperature data of the roadbed block within a certain period of time, providing a data basis for the subsequent simulation of the temperature change caused by vehicle driving. Then, the data calculation chip of the simulation pressurization module calculates the change trend of the temperature data of the roadbed block at all analysis moments, that is, the overall temperature trend, and compares it with the local temperature trend at each analysis moment, and combines the temperature data at the analysis moment to obtain the degree of influence of the instantaneous temperature on the roadbed block, that is, the temperature influence index. Since the high temperature resistance test of the roadbed usually pays more attention to the long-term stability of the roadbed under high temperature conditions, the temperature data of the roadbed block that is more affected by the instantaneous temperature has more evaluation value; the temperature influence index of all roadbed blocks represents the standard level of the roadbed high temperature resistance test, and the reliability of the temperature change of each roadbed block is measured by the difference between the temperature influence index of each roadbed block and the standard level, and it is used to adjust the degree of change of the temperature data of the roadbed block during the analysis time period, so as to improve the accuracy of the required adjustment degree of the temperature data of the roadbed block, that is, the duration adjustment coefficient; based on the duration adjustment coefficient of all roadbed blocks, the duration of heating of the roadbed surface by the simulation pressurization module after the current moment is controlled by the duration adjustment module, so that the temperature change of the roadbed block simulating the vehicle driving is more accurate and meets the test standards, and can accurately simulate the heat received by the highway bridge roadbed, reduce the error between the test data and the actual situation, and improve the detection effect of the roadbed high temperature resistance detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A structural diagram of a simulation pressurization module provided by an embodiment of the present invention;

[0033] Figure 2 A flow chart of a method performed by a roadbed high temperature resistance detection device provided by one embodiment of the present invention;

[0034] Figure 3A schematic diagram of a temperature data variation curve of a roadbed block within a set time period provided by an embodiment of the present invention;

[0035] Figure 1 The numbers in the figure are: 1. DC motor; 2. threaded rod; 3. hydraulic rod; 4. hydraulic rod assembly; 5. load-bearing block; 6. built-in electric heating tube. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, features and effects of a high temperature resistance detection device for a highway bridge subgrade proposed according to the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0037] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0038] A highway bridge roadbed high temperature resistance detection device provided in an embodiment of the present invention includes a roadbed high temperature resistance detection device. The embodiment of the present invention improves the highway roadbed high temperature resistance detection device disclosed in application number 202122825746.4 and utility model name "A highway roadbed high temperature resistance detection device", and the screw 9, nut seat 16, wheel frame 17, and test wheel 18 in the overall structural diagram of the above-mentioned device are replaced as a whole with a simulated pressurization module.

[0039] The body of the roadbed high temperature resistance detection device is provided with a simulated pressurization module, which is used to detect and analyze the heating time of the roadbed surface by the simulated pressurization module, so the simulated pressurization module includes a data acquisition module, a data calculation chip and a time adjustment module. Among them, the data acquisition module is connected to the data calculation chip, which is used for data processing, and the chip type is FPGA, which receives information from the data acquisition module and sends the heating time to the time adjustment module.

[0040] The specific scheme of the high temperature resistance detection device for a highway bridge subgrade provided by the present invention is described in detail below with reference to the accompanying drawings.

[0041] See also Figure 1 , which shows a structural diagram of a simulation pressurizing module provided by an embodiment of the present invention. The roadbed high temperature resistance detection device includes a simulation pressurizing module, and the simulation pressurizing module includes: a DC motor 1; a threaded rod 2; a hydraulic rod 3; a hydraulic rod assembly 4; a load-bearing block 5; and a built-in electric heating tube 6.

[0042] Since only the bottom surface of the load-bearing block of the simulated pressurizing module heats a local position of the roadbed, other positions on the roadbed surface are less affected by the built-in electric heating tube of the simulated pressurizing module. In order to improve the accuracy of subsequent analysis, the embodiment of the present invention evenly divides the roadbed block into different roadbed blocks before the data acquisition module collects data, so that the temperature data collected by the data acquisition module is the temperature data of a single roadbed block.

[0043] The data acquisition module is connected to the signal input end of the data calculation chip, and the signal output end of the data calculation chip is connected to the duration adjustment module. The duration adjustment module is used to adjust the heating time of the roadbed surface by the simulated pressurization module; the data acquisition module is used to collect temperature data of each roadbed block at different times within a set time period, and transmit the data to the data calculation chip.

[0044] It should be noted that the bottom area of ​​the load-bearing block of the simulated pressurizing module is larger than the area of ​​the roadbed block. In the embodiment of the present invention, the area of ​​the roadbed block is set equal to one third of the bottom area of ​​the load-bearing block. The simulated pressurizing module heats the roadbed block at least once within the set time period. The duration of the set time period is an empirical value of 1 hour. The last moment in the set time period is the current moment, and the implementer can set it according to the specific situation.

[0045] The high temperature conditions of highway bridge subgrades during use mainly come from two aspects, specifically: (1) solar radiation: long-term direct sunlight will cause the surface temperature of the subgrade to rise rapidly; (2) vehicle friction heat: during the driving of a large number of vehicles, the tires and the road surface will continuously rub against each other, generating heat and transferring the heat to the subgrade. Therefore, the temperature change of the subgrade of highway bridges is caused by the heat transfer from the environment and the friction heat of the vehicle tires. In the embodiment of the present invention, the electric heating tube in the storage groove of the subgrade high temperature resistance detection device is used to simulate direct sunlight to heat the subgrade, and the built-in electric heating tube 6 in the load-bearing block 5 of the simulated pressurization module is used to simulate the friction heat generated by the wheel driving.

[0046] The specific process of the simulated pressurizing module simulating the friction heat generated by the running of the wheels is as follows: the load-bearing block 5 of the simulated pressurizing module is first heated to a predetermined initial temperature, and then the position of the load-bearing block 5 is adjusted, and a predetermined initial pressure is applied to the load-bearing block 5 through the hydraulic rod 3 and the hydraulic rod assembly 4 to make the load-bearing block 5 contact with the roadbed block. After heating for a certain period of time, the load-bearing block 5 is lifted to complete the heating operation of the roadbed block; the load-bearing block 5 is moved to the next position, and the above heating operation is repeated.

[0047] See also Figure 2 , which shows a flow chart of a method performed by a roadbed high temperature resistance detection device provided by an embodiment of the present invention, the method comprising the following steps:

[0048] Step S100: Select the analysis moment of each roadbed block within the set time period; obtain the temperature influence index of each roadbed block at the current moment based on the difference between the change trend of the temperature data of all analysis moments of each roadbed block and the change trend of the temperature data of the analysis moment in the local time period of each analysis moment, as well as the temperature data of all analysis moments.

[0049] The temperature changes of the roadbed blocks are divided into two stages. One is the stage in which the roadbed temperature slowly rises due to the electric heating tubes in the storage trough of the device simulating direct sunlight. The other is the stage in which the built-in electric heating tubes in the simulated pressurization module simulate the friction between the vehicle and the roadbed blocks, generating an instantaneous high temperature, causing the temperature to rise briefly and then drop. Figure 3 A schematic diagram of a temperature data variation curve of a roadbed block within a set time period provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, Figure 3 The horizontal axis t of the rectangular coordinate system represents time, and the vertical axis T represents temperature data; the unit of time is second, and the unit of temperature data is degree Celsius.

[0050] In the process of simulating direct sunlight by the electric heating tube in the storage tank of the device, the temperature in the storage tank may fluctuate due to factors such as system control accuracy, environmental influences and natural wind, resulting in fluctuations in the temperature of the roadbed block, but the temperature of the roadbed block still shows an overall slow rising trend; the simulated pressurization module simulates the driving of the car to cause the temperature of the roadbed block to increase instantaneously, so there is a maximum value in the temperature data of the roadbed block within the set time period, and the moment corresponding to the maximum value may be in the stage of slow temperature rise, or it may be in the stage of instantaneous high temperature. The maximum value of the temperature data of the roadbed block is analyzed, and the instantaneous high temperature can be focused on and the amount of calculation can be reduced, and the analysis time of the roadbed block is selected. Preferably, in an embodiment of the present invention, the maximum value of the temperature data of each roadbed block at all times within the set time period is obtained, and the moment corresponding to each maximum value is recorded as the analysis time of each roadbed block.

[0051] Since the roadbed block is affected by the direct sunlight simulated by the electric heating tube in the storage tank for a long time in the set time period, and is affected by the simulated vehicle driving simulated by the simulated pressurization module for part of the time, the change trend of the temperature data of the roadbed block at all analysis moments represents the overall temperature change trend of the roadbed block caused by direct sunlight; the change trend of the temperature data at the analysis moment in the local time period of each analysis moment represents the local temperature change trend of the roadbed block at each analysis moment. If the local temperature change trend at each analysis moment is closer to the overall temperature change trend, that is, the difference is smaller, the roadbed block is more likely to be in the slow temperature rise stage at the analysis moment, and the possibility of being affected by the instantaneous temperature at the analysis moment is smaller.

[0052] Since the instantaneous temperature represents the local heat release when the vehicle passes through the roadbed, which exceeds the temperature of the roadbed under direct sunlight, the temperature data at each analysis moment can be used to determine the temperature change stage at that analysis moment; if the temperature data at the analysis moment is small, the analysis moment is in a slow heating stage, and the possibility of being affected by the instantaneous temperature is smaller; conversely, the analysis moment is in an instantaneous high temperature stage.

[0053] By combining the difference between the changing trend of the temperature data at the analysis moment in the local time period of each analysis moment of the roadbed block and the changing trend of the temperature data at all analysis moments, as well as the temperature data at each analysis moment, the degree to which the local range of each analysis moment of the roadbed block is affected by the instantaneous temperature can be accurately analyzed, thereby obtaining the temperature influence index of the roadbed block.

[0054] Preferably, in some possible implementation modes of the embodiments of the present invention, the method for obtaining the temperature influence index includes: establishing a two-dimensional coordinate system with time as the horizontal axis and temperature data as the vertical axis; marking the temperature data of each roadbed block at all analysis moments within a set time period in the two-dimensional coordinate system to obtain the coordinate points of the corresponding moments; performing straight-line fitting on all coordinate points in the two-dimensional coordinate system, and recording the slope of the fitted straight line as the overall temperature change degree of each roadbed block; performing straight-line fitting on the coordinate points corresponding to all analysis moments in the local time period of each analysis moment of each roadbed block in the two-dimensional coordinate system, and recording the slope of the fitted straight line as the overall temperature change degree of each roadbed block. Record the local temperature variation at each analysis moment of each roadbed block; record the concentrated value of the temperature data of all moments in the local time period of each analysis moment of each roadbed block as the concentrated temperature value of each roadbed block; obtain the local temperature influence index of each roadbed block at each analysis moment according to the difference between the temperature data at each analysis moment of each roadbed block and the concentrated temperature value, and the difference between the local temperature variation and the overall temperature variation; normalize the concentrated value of the local temperature influence index of each roadbed block at all analysis moments within the set time period to obtain the temperature influence index of each roadbed block at the current moment.

[0055] It should be noted that, in the embodiment of the present invention, the least squares method is used for straight line fitting; wherein, the least squares method is a well-known technology for those skilled in the art and will not be described in detail here; each analysis moment is located at the center of its local time period, and the local time period of each analysis moment contains at least three analysis moments.

[0056] The concentrated value of data is used to describe the concentrated trend of a group of data, which can be measured by statistical indicators such as mean, median and mode. In the embodiment of the present invention, the mean is used to measure the concentrated value of data, that is, the mean of the temperature data at all times in the local time period of each analysis moment of each roadbed block is recorded as the concentrated value of the temperature of each roadbed block; in other embodiments of the present invention, the mean can also be replaced by the median or mode. The concentrated values ​​of data at other locations in this solution are all measured by the mean.

[0057] In a specific implementation of the embodiment of the present invention, the temperature local impact index of each roadbed block at the ath analysis time within a set time period is expressed by the formula:

[0058]

[0059] In the formula, The local impact index of temperature at the ath analysis time within the set time period for each roadbed block; The local temperature variation of each roadbed block at the ath analysis time within the set time period; K is the overall temperature variation of each roadbed block; The temperature data of each roadbed block at the ath analysis time within the set time period; The concentrated value of temperature at the ath analysis time within the set time period for each roadbed block; is the absolute value function.

[0060] It should be noted that when When the value is larger, the difference between the local temperature change trend and the overall temperature change trend of each roadbed block at the ath analysis moment within the set time period is greater, and the roadbed block is more likely to be in the instantaneous high temperature stage of the built-in electric heating tube of the simulated pressurization module simulating vehicle driving at this analysis moment, and the possibility of being affected by the instantaneous temperature at this analysis moment is greater. The local temperature influence index The larger the value, the smaller the temperature change in the local range at the analysis moment in the slow temperature rise stage, while the larger the temperature change in the local range at the analysis moment in the instantaneous high temperature stage. The embodiment of the present invention measures the degree of temperature change in the local range at the analysis moment through the centralized value of the temperature data at all moments in the local time period of each analysis moment, that is, the mean value; when When the value is larger, the temperature variation degree of the subgrade block in the local range at the ath analysis time within the set time period is greater, and the subgrade block is more likely to be affected by the instantaneous temperature at the analysis time. The bigger.

[0061] The temperature local impact index presents the degree of influence of instantaneous high temperature on the roadbed block at each analysis moment, comprehensively analyzes the degree of influence of instantaneous high temperature on the roadbed block at all analysis moments, and obtains the temperature impact index of the roadbed block at the current moment; specifically: the mean of the temperature local impact index of each roadbed block at all analysis moments within the set time period is normalized to obtain the temperature impact index of each roadbed block at the current moment; the roadbed block with a larger temperature impact index is more affected by the instantaneous temperature. In the embodiment of the present invention, the Sigmoid function is used for normalization, and normalization methods such as function conversion, maximum and minimum normalization, etc. can also be used, which are not limited here.

[0062] Step S200: According to the difference in temperature influencing index between each roadbed block and all roadbed blocks, the degree of change of temperature data of each roadbed block in the analysis time period is adjusted to obtain the duration adjustment coefficient of each roadbed block at the current moment; based on the duration adjustment coefficient of all roadbed blocks, the duration of heating of the roadbed surface for the next time after the current moment is controlled by the duration adjustment module through the simulation pressurization module.

[0063] The high temperature resistance test of the roadbed usually focuses more on the long-term stability of the roadbed under high temperature conditions. The slow heating stage of the roadbed blocks reflects their true reaction when they are continuously exposed to a high temperature environment. Although the instantaneous high temperature generated by the passing of vehicles may reach a higher temperature, this instantaneous and local nature limits its impact on the roadbed as a whole. Therefore, the temperature data in the slow heating stage is more practical and valuable for evaluation. It can be concluded that the greater the impact of the instantaneous temperature, that is, the greater the temperature impact index, the lower the reliability of the temperature data of the roadbed blocks for regulation.

[0064] The temperature variation of the roadbed blocks heated by the simulated pressurization module has corresponding standards to meet the experimental standards for high temperature resistance testing of highway bridge roadbeds. The control of the temperature variation of the roadbed blocks can be achieved by adjusting the heating time of the roadbed by the simulated pressurization module. The temperature impact index presents the confidence level of the temperature data of the roadbed blocks, that is, to ensure the reliability of the temperature data under multiple simulated pressurization environments, then the adjustment of the heating time of the simulated pressurization module should be to adjust the roadbed blocks that are most affected by the instantaneous temperature.

[0065] The temperature data of each roadbed block is affected not only by the electric heating tubes in the storage trough of the device simulating direct sunlight, but also by the heat generated by the built-in electric heating tubes in the simulated pressurization module simulating vehicle driving. It is also affected by the higher temperature of other roadbed blocks transferred to the roadbed block. Therefore, it is necessary to consider the temperature influence indicators of all roadbed blocks.

[0066] The area of ​​the load-bearing block of the simulated pressure module is much smaller than that of the roadbed block, so that each simulated pressure module can only heat part of the roadbed blocks at each moment. The temperature change of most roadbed blocks is caused by the electric heating tube in the storage tank simulating direct sunlight, which is consistent with the real reaction of the roadbed blocks when they are continuously exposed to high temperature environment. The higher the reliability of the temperature data of these roadbed blocks for regulation; therefore, the concentrated value of the temperature influence index of all roadbed blocks at the current moment represents the standard level of roadbed high temperature resistance detection. The greater the difference between the temperature influence index of each roadbed block at the current moment and the standard level, the lower the reliability of the temperature data of the roadbed block for heating regulation. The degree of change of the temperature data of each roadbed block during the analysis time period reflects the degree of adjustment required for the temperature data of the roadbed block, and the difference in the temperature influence index between each roadbed block and all roadbed blocks is used for adjustment, so as to improve the accuracy of the degree of adjustment required for the temperature data of the roadbed block, i.e., the time length adjustment coefficient.

[0067] Preferably, in some possible implementation modes of the embodiments of the present invention, the method for obtaining the duration adjustment coefficient includes: selecting the target block at the current moment from all roadbed blocks based on the temperature impact index; taking the extreme difference of the temperature data of each target block at all moments in the analysis time period as the temperature difference of each target block at the current moment; using the difference in the temperature impact index between each target block and all roadbed blocks to adjust the temperature difference, and obtain the duration adjustment coefficient of each target block at the current moment.

[0068] First, a roadbed block with low reliability of temperature data, i.e., a target block, is selected, and the temperature change is made to meet the corresponding standard by adjusting the heating time of the target block by the simulated pressure module; since the reliability of the temperature data of the roadbed block with a larger temperature impact index for regulation is lower, the target block is selected by using the temperature impact index. The method for obtaining the target block is: for the temperature impact index of all roadbed blocks at the current moment, the roadbed block corresponding to the temperature impact index greater than the preset impact threshold is used as the target block at the current moment. Preferably, the method for obtaining the duration adjustment coefficient in the embodiment of the present invention is: negatively correlated mapping the absolute value of the difference between the temperature impact index of each target block and the concentrated value of all temperature impact indicators of all roadbed blocks is performed to obtain the reliability coefficient of each target block; the temperature difference is weighted by the reliability coefficient to obtain the weighted difference value of each target block; the ratio of the weighted difference value to the preset standard temperature change value is normalized to obtain the duration adjustment coefficient of each target block at the current moment.

[0069] It should be noted that in the embodiment of the present invention, the preset impact threshold is an empirical value of 0.68; the preset standard temperature change value is an empirical value of 1.2 degrees Celsius; each analysis moment is the last moment in its analysis time period, and the duration of the analysis time period is an empirical value of 5 minutes, which can be set by the implementer according to the specific situation; the duration of the time period is set to be greater than the duration of the analysis time period.

[0070] In a specific implementation of the embodiment of the present invention, the duration adjustment coefficient of each target block at the current moment is expressed by the formula:

[0071]

[0072] In the formula, is the duration adjustment coefficient of the i-th target block at the current moment; is the temperature difference of the i-th target block at the current moment, that is, the extreme difference of the temperature data of the target block at all moments in the analysis time period; is the temperature impact index of the i-th target block at the current moment; is the average value of the temperature impact index of all roadbed blocks at the current moment; For the preset standard temperature change value, take the empirical value of 1.2; is the reliability coefficient of the i-th target block; is the weighted difference value of the i-th target block; Absolute value function; Norm is a normalization function. In the embodiment of the present invention, the constant 1 is subtracted Realize Negative correlation mapping.

[0073] It should be noted that Represents the standard level of high temperature resistance testing of roadbed, represents the reliability of the temperature data of the i-th target block for heating control; when The bigger it is, The smaller is , the higher the reliability of the temperature data of the i-th target block for heating control. The larger the value, the greater and more accurate the change in the temperature data of the i-th target block during the analysis period, and the greater the adjustment required for the temperature data of the roadbed block. The bigger.

[0074] The duration adjustment coefficient represents the relative size of the temperature data change of each target block in the analysis time period relative to the preset standard temperature change value. If the duration adjustment coefficient is larger, the temperature data change of the target block is too large, and it is necessary to reduce the heating time of the target block by the simulated pressurization module so that the temperature change of the target block meets the corresponding standard, so as to improve the accuracy of the roadbed high temperature resistance detection device. The method for adjusting the heating time of the simulated pressurization module is:

[0075] The standard heating time is weighted by using the difference between the mean of the time adjustment coefficients of all roadbed blocks and the constant 1 to obtain the corrected heating time of the simulated pressurization module at the current moment; the time period between the current moment and the start moment of the next heating of the roadbed surface by the simulated pressurization module is recorded as the test time period of the simulated pressurization module; the average of the corrected heating time of the simulated pressurization module at all moments in the test time period is used as the heating time of the next heating of the roadbed surface by the simulated pressurization module after the current moment.

[0076] Since the temperature data of the roadbed blocks simulating direct sunlight present the actual situation when the roadbed is continuously exposed to a high temperature environment, the temperature change of the roadbed blocks under direct sunlight is smaller than the temperature change caused by vehicle driving, and the adjustment of the heating time of the simulated pressurization module should be for the roadbed blocks that are more affected by instantaneous temperature. For roadbed blocks with excessive temperature data changes, the temperature change can be reduced by reducing the heating time of the simulated pressurization module on the roadbed, so that the temperature changes caused by vehicle driving in the roadbed blocks can be simulated more accurately and meet the test standards, so as to accurately simulate the heat received by the highway bridge roadbed, thereby improving the detection effect of the roadbed high temperature resistance detection device.

[0077] It should be noted that the standard heating time in the embodiment of the present invention takes an empirical value of 1 second, and the implementer can set it according to the specific situation.

[0078] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A road bridge subgrade high temperature resistance detection device, comprising a road subgrade high temperature resistance detection device, characterized in that: The roadbed high temperature resistance detection device includes a simulation pressurization module, which is installed in the roadbed high temperature resistance detection device body, and the simulation pressurization module includes: a data acquisition module, a data calculation chip and a time adjustment module; The data acquisition module is connected to the signal input end of the data calculation chip, and the signal output end of the data calculation chip is connected to the duration adjustment module, and the duration adjustment module is used to adjust the heating duration of the roadbed surface by the simulated pressurization module; the data acquisition module is used to collect temperature data of each roadbed block at different times within a set time period, and transmit the data to the data calculation chip; the last time within the set time period is the current time; The data calculation chip is used to select the analysis time of each roadbed block from a set time period; according to the difference between the change trend of the temperature data of all analysis times of each roadbed block and the change trend of the temperature data of the analysis time in the local time period of each analysis time, as well as the temperature data of all analysis times, the temperature influence index of each roadbed block at the current time is obtained; According to the difference between the temperature impact index of each roadbed block and all roadbed blocks, the degree of change of the temperature data of each roadbed block in the analysis time period is adjusted to obtain the duration adjustment coefficient of each roadbed block at the current moment; based on the duration adjustment coefficient of all roadbed blocks, the duration of heating of the roadbed surface by the simulation pressurization module next time after the current moment is controlled through the duration adjustment module; The method for obtaining the temperature impact index of each roadbed block at the current moment includes: A two-dimensional coordinate system is established with time as the horizontal axis and temperature data as the vertical axis; the temperature data of each roadbed block at all analysis moments within a set time period are marked in the two-dimensional coordinate system to obtain the coordinate points at the corresponding moments; a straight line is fitted to all the coordinate points in the two-dimensional coordinate system, and the slope of the fitted straight line is recorded as the overall temperature change degree of each roadbed block; a straight line is fitted to the coordinate points corresponding to all analysis moments in the local time period of each analysis moment of each roadbed block in the two-dimensional coordinate system, and the slope of the fitted straight line is recorded as the local temperature change degree of each analysis moment of each roadbed block; The concentrated value of the temperature data at all times in the local time period of each analysis moment of each roadbed block is recorded as the concentrated temperature value of each roadbed block; According to the difference between the temperature data of each roadbed block at each analysis moment and the temperature concentration value, and the difference between the local temperature variation and the overall temperature variation, the temperature local influence index of each roadbed block at each analysis moment is obtained; Normalizing the centralized values ​​of the temperature local impact index of each roadbed block at all analysis moments within a set time period to obtain the temperature impact index of each roadbed block at the current moment; The method for obtaining the duration adjustment coefficient of each roadbed block at the current moment includes: Selecting a target block at the current moment from all roadbed blocks based on the temperature impact index; taking the extreme difference of the temperature data of each target block at all moments in the analysis time period as the temperature difference of each target block at the current moment; Using the difference between the temperature impact index of each target block and all roadbed blocks, the temperature difference is adjusted to obtain the duration adjustment coefficient of each target block at the current moment; The method of controlling the heating time of the next heating of the roadbed surface by the simulation pressurization module after the current moment based on the time adjustment coefficient of all roadbed blocks through the time adjustment module includes: The standard heating duration is weighted by using the difference between the concentrated value of the duration adjustment coefficient of all roadbed blocks and the constant 1 to obtain the corrected heating duration of the simulated pressurization module at the current moment; The time period between the current moment and the next start moment of heating the roadbed surface by the simulated pressurization module is recorded as the test time period of the simulated pressurization module; the centralized value of the corrected heating time lengths of the simulated pressurization module at all moments in the test time period is used as the heating time length of the roadbed surface that the simulated pressurization module heats next time after the current moment; The method for selecting the analysis time of each roadbed block within a set time period includes: The maximum value of the temperature data of each roadbed block at all times within a set time period is obtained, and the time corresponding to each of the maximum values ​​is recorded as the analysis time of each roadbed block.

2. A highway bridge subgrade high temperature resistance detection device according to claim 1, characterized in that: The method of adjusting the temperature difference by using the difference between the temperature impact index of each target block and all roadbed blocks to obtain the duration adjustment coefficient of each target block at the current moment includes: The absolute value of the difference between the temperature impact index of each target block and the concentrated value of all temperature impact indexes of all roadbed blocks is negatively correlated to obtain the reliability coefficient of each target block; the temperature difference is weighted by using the reliability coefficient to obtain the weighted difference value of each target block; the ratio of the weighted difference value to the preset standard temperature change value is normalized to obtain the duration adjustment coefficient of each target block at the current moment.

3. A highway bridge subgrade high temperature resistance detection device according to claim 1, characterized in that: The method of selecting the target block at the current moment from all roadbed blocks based on the temperature impact index includes: For the temperature influence indexes of all roadbed blocks at the current moment, the roadbed block corresponding to the temperature influence index greater than a preset influence threshold is used as the target block at the current moment.

4. A highway bridge subgrade high temperature resistance detection device according to claim 1, characterized in that: The duration of the set time period is greater than the duration of the analysis time period.

5. A highway bridge subgrade high temperature resistance detection device according to claim 1, characterized in that: The method for performing straight line fitting on all coordinate points in the two-dimensional coordinate system is the least squares method.

6. A highway bridge subgrade high temperature resistance detection device according to claim 3, characterized in that: The preset impact threshold is 0.68.

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