JP7087940B2 - Deterioration evaluation program, deterioration evaluation device and deterioration evaluation method - Google Patents

Description

The present invention relates to a deterioration evaluation program and the like.

As a method for evaluating the deterioration of the deck of a bridge, a method considering the influence of temperature due to the season and the environment is known (see, for example, Patent Document 1-5).

For example, Patent Document 1 discloses a technique for evaluating the soundness of a substructure of a bridge. The substructure referred to here includes a foundation, a pier constructed on the foundation, and a bearing provided on the pier and instructing a bridge or a viaduct. The floor slab corresponds to superstructure. In such a technique, a temperature sensor and an inclination sensor are arranged on a pier, temperature information is acquired by the temperature sensor at predetermined time intervals, and inclination information of the pier in the bridge axis direction is acquired by the inclination sensor. Then, the pier inclination change rate, which is the change amount of the inclination information with respect to the change amount of the temperature information within a certain period, is obtained, and the soundness of the substructure is judged by the magnitude of the pier inclination change rate.

Japanese Unexamined Patent Publication No. 2015-78553 Japanese Unexamined Patent Publication No. 2011-22029 Japanese Unexamined Patent Publication No. 2017-90160 Japanese Unexamined Patent Publication No. 2016-3475 Japanese Unexamined Patent Publication No. 2010-107246

JSCE 71st Annual Academic Lecture Summary CS7-036, September 2016

However, with the conventional technique, there is a problem that it is difficult to evaluate the deterioration state of the deck of a bridge by excluding the influence of temperature. That is, as the deck of a bridge ages, the inclination angle of the deck increases. On the other hand, since the deck of a bridge expands and contracts according to the temperature difference between the upper surface and the lower surface, the inclination angle of the deck changes due to seasonal changes and changes in the date and time. Therefore, it is difficult to determine whether the change in the inclination angle of the deck is simply due to the temperature or the deterioration of the deck. That is, it is difficult to evaluate the deterioration status of the deck of a bridge by excluding the influence of temperature.

For example, in Patent Document 1, temperature information on a pier is acquired, the rate of change in pier inclination with respect to the amount of change in temperature information is obtained, and the soundness of the deck of the pier is determined by the magnitude of the rate of change in pier inclination. However, it cannot be determined whether the pier inclination is caused by the temperature difference between the upper surface and the lower surface of the deck or the deterioration of the deck. That is, it is difficult to evaluate the deterioration status of the deck of a bridge by excluding the influence of temperature.

One aspect of the present invention is to evaluate the deterioration state of a bridge deck, excluding the influence of temperature.

In one embodiment, the degradation evaluation program provides the computer with temperature information on the top and bottom surfaces of the floor slab to be evaluated for deterioration, and tilt information from the girder to be evaluated and the tilt sensor installed on the floor slab. The observation data including the observation data is acquired for a period in which the relationship between the temperature of the upper surface and the temperature of the lower surface changes, and from the observation data, the inclination angle of the single unit of the floor slab and the upper surface of the floor slab are obtained. A prediction model regarding the relationship between the temperature and the temperature of the lower surface is constructed, and the prediction model is used to execute a process for evaluating the deterioration of the floor slab.

According to one embodiment, the deterioration state of the deck of a bridge can be evaluated by excluding the influence of temperature.

FIG. 1 is a functional block diagram showing a configuration of a deterioration evaluation system including a deterioration evaluation device according to an embodiment. FIG. 2 is a diagram illustrating a temperature difference and expansion and contraction of a deck. FIG. 3 is a diagram showing an example of the installation position of the temperature sensor and the tilt sensor. FIG. 4 is a diagram showing an example of upper and lower surface temperature data of the floor slab. FIG. 5 is a diagram showing an example of tilt angle data of a single deck slab. FIG. 6 is a diagram showing an example of deterioration evaluation according to an embodiment. FIG. 7 is a diagram showing a reference example of deterioration evaluation when the evaluation function is constructed only by the bottom surface temperature. FIG. 8 is a diagram showing a reference example of deterioration evaluation when the evaluation function is constructed only in the summer. FIG. 9 is a diagram showing a reference example of deterioration evaluation when the evaluation function is constructed only in winter. FIG. 10 is a diagram showing an example of a flowchart of the data acquisition process according to the embodiment. FIG. 11 is a diagram showing an example of a flowchart of the evaluation function construction process according to the embodiment. FIG. 12 is a diagram showing an example of a flowchart of the evaluation process according to the embodiment. FIG. 13 is a diagram showing an example of a computer that executes a deterioration evaluation program.

Hereinafter, examples of the deterioration evaluation program, deterioration evaluation device, and deterioration evaluation method disclosed in the present application will be described in detail with reference to the drawings. The present invention is not limited to the examples.

[Configuration of deterioration evaluation system including deterioration evaluation device according to the embodiment]
FIG. 1 is a functional block diagram showing a configuration of a deterioration evaluation system including a deterioration evaluation device according to an embodiment. The deterioration evaluation device 1 shown in FIG. 1 constructs a prediction model for the deterioration of the deck using the inclination angle of the deck of the bridge (bridge) and the temperature above and below the deck, and uses the prediction model to construct a prediction model. Evaluate the deterioration of the deck excluding the effect of temperature. The floor slab referred to here refers to a place corresponding to the floor on which the load of the vehicle is directly applied.

Here, it will be described with reference to FIG. 2 that the deterioration state of the deck cannot be appropriately evaluated only by the inclination angle of the deck. FIG. 2 is a diagram illustrating a temperature difference and expansion and contraction of a deck. As shown in the graph of FIG. 2, the temperature change between the upper surface and the lower surface of the deck varies depending on the season.

As shown in the left figure of FIG. 2, in the summer, the temperature of the upper surface of the deck rises to around 60 ° C. in the daytime, and even at night, it becomes higher than the outside temperature due to the influence of the heat storage of the concrete. Then, the upper part of the deck stretches and the lower part shrinks. As the temperature rises, the deflection of the deck increases and the tilt angle also increases, but due to the above phenomenon, the tilt angle of the deck becomes smaller than the tilt angle of the outside air temperature and the average temperature of the deck.

Further, as shown in the right figure of FIG. 2, in winter, at night, the temperature of the upper surface of the deck is lower than the temperature of the lower surface so that the road surface freezes due to the influence of radiative cooling. Then, the upper part of the deck shrinks and the lower part expands. When the temperature decreases, the bending of the deck becomes smaller and the tilt angle becomes smaller, but due to the above phenomenon, the tilt angle of the deck becomes larger than the tilt angle of the outside air temperature and the average temperature of the deck.

Therefore, the deterioration evaluation device 1 cannot appropriately evaluate the deterioration of the floor slab by simply correcting the temperature of the tilt angle of the floor slab. Therefore, in the following description, a deterioration evaluation device 1 for evaluating the deterioration of the floor slab by constructing an evaluation model using not only the tilt angle of the floor slab but also the temperature above and below the floor slab and using the constructed evaluation model will be described. do.

Returning to FIG. 1, the deterioration evaluation system 9 includes a deterioration evaluation device 1, a temperature sensor 2, and an inclination sensor 3. The deterioration evaluation device 1 connects the temperature sensor 2 and the tilt sensor 3 via the network 4, respectively.

The temperature sensor 2 detects the surface temperatures above and below the deck. The temperature of the upper surface of the deck is for detecting the surface temperature of the sunshine portion of the deck. The temperature of the lower surface of the deck is for detecting the surface temperature of a portion of the deck that is not a sunshine portion. The temperature sensor 2 is installed at a position where the temperature of the upper surface of the deck and the temperature of the lower surface of the deck can be detected.

The tilt sensor 3 detects the tilt angle of the upper surface of the deck in the horizontal direction and also detects the tilt angle of the girder in the horizontal direction in order to calculate the tilt angle of the deck alone. The tilt sensor 3 is, for example, an acceleration sensor, but is not limited to this, and any sensor such as a tilt angle sensor or an angular velocity sensor that can measure tilt may be used. The tilt sensor 3 is installed at a position where the tilt angle of the deck and the tilt angle of the girder can be detected.

Here, an example of the installation position of the temperature sensor 2 and the tilt sensor 3 will be described with reference to FIG. FIG. 3 is a diagram showing an example of the installation position of the temperature sensor and the tilt sensor. As shown in FIG. 3, the bridge B0 is shown. The bridge B0 includes a floor slab B1, a girder B2, and a pier B3. The floor slab B1 is, for example, a floor plate for transmitting the weight of a vehicle passing over a bridge to the girder B2 and the pier B3. The girder B2 refers to, for example, a material that supports the floor slab B1. The pier B3 is a structure that supports the bridge, and may be an abutment.

The temperature sensor 2-1 is installed on the upper surface of the floor slab B1. Further, the temperature sensor 2-2 is installed on the lower surface of the floor slab B1. As a result, the deterioration evaluation device 1 can acquire the temperature of the upper and lower surfaces of the floor slab B1.

The tilt sensor 3-1 is installed on the lower surface of the girder B2, the tilt sensor 3-2 is installed on the lower surface of the deck B1, and the positional relationship between the two sensors is a direction orthogonal to the longitudinal direction of the girder B2. Will be installed in. As a result, the deterioration evaluation device 1 can acquire the inclination angle of the girder B2 together with the inclination angle of the floor slab B1. The reason for acquiring not only the tilt angle of the deck B1 but also the tilt angle of the girder B2 is to calculate the tilt angle of the deck B1 alone. That is, since the girder B2 supports the floor slab B1, when the girder B2 is tilted, the tilt angle of the girder B2 is added to the tilt angle of the floor slab B1. Therefore, the deterioration evaluation device 1 acquires not only the inclination angle of the floor slab B1 but also the inclination angle of the girder B2. As a result, the deterioration evaluation device 1 can calculate the inclination angle of the floor slab B1 alone by the inclination angle of the floor slab B1 and the inclination angle of the girder B2. The inclination angle of the floor slab B1 alone may be obtained by subtracting the inclination angle of the girder B2 from the inclination angle of the floor slab B1.

Returning to FIG. 1, the deterioration evaluation device 1 has a control unit 10 and a storage unit 20.

The control unit 10 corresponds to an electronic circuit such as a CPU (Central Processing Unit). Then, the control unit 10 has an internal memory for storing a program and control data defining various processing procedures, and executes various processing by these. The control unit 10 has a data acquisition unit 11, an evaluation function construction unit 12, and an evaluation unit 13. The data acquisition unit 11 is an example of an acquisition unit. The evaluation function construction unit 12 is an example of the construction unit. The evaluation unit 13 is an example of the evaluation unit.

The storage unit 20 is, for example, a semiconductor memory element such as a RAM (Random Access Memory) or a flash memory (Flash Memory), or a storage device such as a hard disk or an optical disk. The storage unit 20 has a top surface temperature data 21, a bottom surface temperature data 22, a girder tilt angle data 23, a deck tilt angle data 24, a deck single tilt angle data 25, and an evaluation model 26.

The top surface temperature data 21 is temperature data for learning for constructing a prediction model, and is temperature data on the top surface of the deck B1. The upper surface temperature data 21 is the upper surface temperature data in which the learning period is a period during which the relationship between the upper surface temperature and the lower surface temperature in the deck B1 changes. Such a period is, for example, a period from summer to winter, or a period from winter to summer. The period is not limited to this, and may be a period including summer and winter, and may be one year, or may be a period that can be ignored even if the deck B1 is deteriorated. The top surface temperature data 21 is stored, for example, by the data acquisition unit 11.

The bottom surface temperature data 22 is temperature data for learning for constructing a prediction model, and is temperature data on the bottom surface of the deck B1. The bottom surface temperature data 22 is the temperature data of the bottom surface of the deck B1 for the same period as the top surface temperature data 21. The bottom surface temperature data 22 is stored, for example, by the data acquisition unit 11.

The digit tilt angle data 23 is tilt data for learning for constructing a prediction model, and is tilt angle data of the digit B2. The girder inclination angle data 23 is the inclination angle data of the girder B2 for the same period as the upper surface temperature data 21 and the lower surface temperature data 22. The digit tilt angle data 23 is stored, for example, by the data acquisition unit 11.

The deck tilt angle data 24 is tilt data for learning for constructing a prediction model, and is tilt angle data of the deck B1. The deck tilt angle data 24 is the tilt angle data of the deck B1 for the same period as the top surface temperature data 21, the bottom surface temperature data 22, and the girder tilt angle data 23. The floor slab tilt angle data 24 is stored, for example, by the data acquisition unit 11.

The floor slab unit tilt angle data 25 is tilt data for learning for constructing a prediction model, and is tilt angle data of the floor slab B1 alone. The floor slab unit tilt angle data 25 is the floor slab B1 unit tilt angle data for the same period as the top surface temperature data 21, the bottom surface temperature data 22, the girder tilt angle data 23, and the floor slab tilt angle data 24. The floor slab unit tilt angle data 25 is data obtained by subtracting the tilt angle of the girder B2 from the tilt angle of the deck B1 for each of the same observation points. The floor slab unit tilt angle data 25 is stored by the evaluation function construction unit 12.

The evaluation model 26 is a learning model used to evaluate the deterioration of the deck. The evaluation model 26 is represented by an evaluation function relating to the relationship between the tilt angle of the floor slab alone, the top surface temperature of the floor slab, and the bottom surface temperature of the floor slab. The evaluation model 26 is constructed by the evaluation function construction unit 12.

The data acquisition unit 11 obtains learning data (hereinafter referred to as learning data) including temperature information on the upper surface and the lower surface of the deck B1 and tilt information by the tilt sensor 3 installed on the girder B2 and the deck B1. Obtained for a period during which the relationship between the temperature of the upper surface and the temperature of the lower surface of the deck B1 changes.

For example, the data acquisition unit 11 acquires the tilt angle data of the digit B2 from the tilt sensor 3-1 over time. The data acquisition unit 11 acquires the inclination angle data of the deck B1 from the inclination sensor 3-2 over time. The data acquisition unit 11 extracts the period during which the vehicle is not traveling by using the inclination angle data of the girder B2 and the inclination angle data of the deck B1 acquired over time. As an example, the data acquisition unit 11 determines that the vehicle is not traveling when the fluctuation of the inclination angle data of the digit B2 and the inclination angle data of the deck B1 acquired over time is less than the reference value. .. Then, the data acquisition unit 11 acquires the digit B2 inclination angle data and the inclination angle data of the deck B1 during the period when the vehicle is not traveling.

Then, the data acquisition unit 11 acquires the temperature data of the upper surface of the deck B1 from the temperature sensor 2-1 during the period when the vehicle is not traveling. The data acquisition unit 11 acquires temperature data on the lower surface of the deck B1 from the temperature sensor 2-2 while the vehicle is not traveling.

Then, the data acquisition unit 11 uses the temperature data of the upper surface of the floor slab B1 and the temperature data of the lower surface of the floor slab B1 acquired during the period when the vehicle is not running as the temperature data for learning, and the upper surface temperature data of the storage unit 20. It is stored in 21 and the bottom surface temperature data 22. The data acquisition unit 11 uses the tilt angle data of the digit B2 and the tilt angle data of the floor slab B1 acquired during the period when the vehicle is not running as learning tilt data, and the digit tilt angle data 23 and the floor slab of the storage unit 20. It is stored in the tilt angle data 24.

The evaluation function construction unit 12 builds learning data (learning temperature) in order to build a prediction model (evaluation function) regarding the relationship between the inclination angle of the floor slab B1 alone and the temperature of the upper surface and the lower surface of the floor slab B1. Data, inclination data for learning) is processed.

For example, the evaluation function construction unit 12 calculates the tilt angle of the deck B1 alone for each of the same observation points by using the digit tilt angle data 23 and the deck tilt angle data 24 included in the learning tilt data. That is, the evaluation function construction unit 12 calculates the value obtained by subtracting the inclination angle of the girder B2 from the inclination angle of the deck B1 at the same observation point as the inclination angle of the floor slab B1 alone at this observation point. Then, the evaluation function construction unit 12 stores the tilt angle data of the floor slab B1 alone in the floor slab single tilt angle data 25 of the storage unit 20 as learning tilt data.

Then, the evaluation function construction unit 12 calculates the daily average temperature of the top surface temperature data 21 included in the learning temperature data, and adds it to the top surface temperature data 21. The evaluation function construction unit 12 calculates the daily average temperature of the bottom surface temperature data 22 included in the learning temperature data, and adds it to the bottom surface temperature data 22. The evaluation function construction unit 12 calculates the daily average inclination angle of the floor slab unit inclination angle data 25 included in the learning inclination data, and adds it to the floor slab unit inclination angle data 25.

Here, an example of the top surface temperature data 21, the bottom surface temperature data 22, the girder tilt angle data 23, the deck tilt angle data 24, and the floor slab unit tilt angle data 25 will be described with reference to FIGS. 4 and 5. In FIGS. 4 and 5, the period in which the relationship between the temperature of the upper surface and the temperature of the lower surface changes is defined as the period from summer to winter.

FIG. 4 is a diagram showing an example of upper and lower surface temperature data of the floor slab.

The left figure of FIG. 4 shows the top surface temperature data 21 of the deck B1 with the X-axis as the day and the Y-axis as the temperature. Here, the 0th day is set as a predetermined day in the summer, and the upper surface temperature of the floor slab B1 is shown every day from the 0th day. From this top surface temperature data 21, a linear function y = −0.1848x + 39.506 of the top surface temperature is calculated by, for example, the least squares method.

The right figure of FIG. 4 shows the bottom surface temperature data 22 of the deck B1 with the X-axis as the day and the Y-axis as the temperature. Here, the 0th day is regarded as the same day as the 0th day of the upper surface temperature data 21, and the lower surface temperature of the floor slab B1 is shown every day from the 0th day. From this bottom surface temperature data 22, for example, a linear function y = −0.1462x + 29.878 of the bottom surface temperature is calculated by the least squares method.

FIG. 5 is a diagram showing an example of tilt angle data of a single deck slab.

In the upper left figure of FIG. 5, the girder inclination angle data 23 of the girder B2 is shown with the X-axis as the day and the Y-axis as the angle. Here, the 0th day is regarded as the same day as the 0th day of the upper surface temperature data 21 and the lower surface temperature data 22, and the inclination angle of the digit B2 for each day from the 0th day is shown.

In the upper right figure of FIG. 5, the deck tilt angle data 24 of the deck B1 is shown with the X-axis as the day and the Y-axis as the angle. Here, the 0th day is the same day as the 0th day of the upper surface temperature data 21, the lower surface temperature data 22, and the girder inclination angle data 23 of the girder B2, and the inclination angle of the floor slab B1 is shown every day from the 0th day.

In the lower figure of FIG. 5, the floor slab unit tilt angle data 25 is shown with the X-axis as the day and the Y-axis as the angle difference. Here, the 0th day is regarded as the same day as the 0th day of the upper surface temperature data 21, the lower surface temperature data 22, the girder inclination angle data 23 of the digit B2, and the floor slab inclination angle data 24 of the floor slab B1, and the floor slab every day from the 0th day. The tilt angle of B1 alone is shown. That is, the data acquisition unit 11 adds the angle difference obtained by subtracting the tilt angle of the girder B2 from the tilt angle of the deck B1 to the deck unit tilt angle data 25 every day. From this floor slab unit tilt angle data 25, for example, a linear function y = −0.0027x + 0.6693 of the tilt angle of the floor slab B1 unit is calculated by the least squares method.

Returning to FIG. 1, the evaluation function construction unit 12 predicts the relationship between the inclination angle of the deck B1 alone and the temperature of the upper surface and the lower surface of the deck B1 from the training data after processing (evaluation function). ) Is constructed.

For example, the evaluation function construction unit 12 weights the upper surface temperature T2 and the lower surface temperature T1 of the deck B1 using the training data after processing as in the equation (1), and the deck B1 The evaluation function f added to the single tilt angle θ is constructed. As the learning data, data for a period (learning period) in which the relationship between the temperature of the upper surface and the temperature of the lower surface of the deck B1 changes is used. Note that θ, T1 and T2 in the equation (1) are the inclination angle of the floor slab B1 alone, the temperature of the lower surface of the floor slab B1, and the temperature of the upper surface of the floor slab B1, respectively. Further, w1 and w2 are weights on the temperature of the lower surface and weights on the temperature of the upper surface, respectively.
f (θ, T1, T2) = θ-w1 x T1-w2 x T2 ... Equation (1)

That is, the evaluation function construction unit 12 learns the learning period in order to construct the evaluation function f having the inclination angle θ of the floor slab B1 alone and the temperature T2 on the upper surface and the temperature T1 on the lower surface of the floor slab B1 as parameters. The weights w1 and w2 are determined using the data.

As an example, assume that the study period is from summer to winter. Then, during the learning period, the temperature of the upper surface of the floor slab B1, the temperature of the lower surface of the floor slab B1, and the inclination angle of the floor slab B1 alone are all lowered and can be represented by primary coupling. That is, the evaluation function construction unit 12 calculates a linear combination (linear approximation) of the tilt angle of the deck B1 alone by using the deck single tilt angle data 25 during the learning period. The evaluation function construction unit 12 calculates a linear combination (linear approximation) of the temperature of the lower surface of the deck B1 using the lower surface temperature data 22 of the learning period. The evaluation function construction unit 12 calculates a linear combination (linear approximation) of the temperature of the upper surface of the deck B1 using the upper surface temperature data 21 of the learning period. Here, it is assumed that the inclination angle of the floor slab B1 alone is represented by a linear combination α ₀ t + β ₀ with the time t as a variable. It is assumed that the temperature of the lower surface of the deck B1 is represented by the linear combination α ₁ t + β ₁ with the time t as a variable. It is assumed that the temperature of the upper surface of the deck B1 is expressed by a linear combination α ₂ t + β ₂ with the time t as a variable.

If the learning period is from summer to winter, it is presumed that even if the deck B1 is deteriorated, it can be ignored. Therefore, the evaluation function construction unit 12 determines the weights w1 and w2 so that the evaluation function of the equation (1) is constant. That is, the evaluation function construction unit 12 substitutes the linear combination α ₀ t + β ₀ for θ in the equation (1), substitutes the linear combination α ₁ t + β ₁ for T 1 in the equation (1), and substitutes T 2 in the equation (1). Substituting the linear combination α ₂ t + β ₂ to calculate the weights w1 and w2 of g (t | w1, w2) represented by the equation (2). It should be noted that the const in the equation (2) indicates that it is a constant.
g (t | w1, w2) = α ₀ t + β ₀ −w ₁ × (α ₁ t + β ₁ ) −w ₂ × (α ₂ t + β ₂ ) = constant ・ ・ ・ Equation (2)

In order to solve the equation (2), the constraint condition of the equation (3) shown below is given. The meaning of the constraint condition in the equation (3) is that in order for the equation (2) to be a constant, it must be 0 regardless of the value of the variable t.

In addition, in order to solve the equation (2), the constraint condition of the equation (4) shown below is set. The meaning of the constraint condition in the equation (4) is that the square of the difference between f and g is minimized by the method of least squares in order to obtain w1 and w2 shown as likelihoods. Regarding equation (4), i represents the observation point of each sample in the training data, and n represents the maximum number of samples. As an example, in the top surface temperature data 21, the bottom surface temperature data 22, and the floor slab unit tilt angle data 25, a day is represented, and n represents a maximum number of days.

The weight w2 is calculated as the equation (5) by the equation (3).

Then, after substituting the weight w2 into the equation (4), the result of partial differentiation with respect to the weight w1 is set to 0 as in the equation (6). This is because when the result of partial differentiation with respect to the weight w1 becomes 0, the square of the difference between f and g becomes the minimum.

From the equation (6), the weight w1 is calculated as the equation (7).

As an example, when the training data is the upper surface temperature data 21 of FIG. 4, the lower surface temperature data 22 of FIG. 4, and the floor slab unit tilt angle data 25 of FIG. 5, the weight w1 is calculated as 0.0469. , The weight w2 is calculated to be −0.0224.

Further, the evaluation function construction unit 12 calculates the threshold value of the evaluation function. For example, the evaluation function construction unit 12 calculates the threshold value of the evaluation function by using the residual deformation angle of the predetermined category (category requiring countermeasure). The reason why the residual deformation angle of the countermeasure-required category is used is to use it as the limit angle of whether or not the inclination angle of the deck is sound. As an example, for the evaluation function f, the evaluation function construction unit 12 sets the residual deformation angle of the countermeasure-requiring category of the floor slab as the single inclination angle θ, the lowest bottom surface temperature in the learning period as the bottom surface temperature T1, and the bottom surface temperature T1. The threshold temperature TH of the evaluation function f is calculated by setting the upper surface temperature of the observation point of No. 1 as the upper surface temperature T2. The observation point with the lowest bottom surface temperature in the learning period is used because it is presumed that the influence of the temperature on the tilt angle of the deck becomes significant when the bottom surface temperature is the lowest. In other words, it is presumed that the deck will be the most severely deflected than the actual deflection.

Further, the evaluation function construction unit 12 stores the constructed evaluation function and the threshold value as an evaluation model in the evaluation model 26 of the storage unit 20.

The evaluation unit 13 evaluates the deterioration of the deck using the prediction model (evaluation function) constructed by the evaluation function construction unit 12. For example, the evaluation unit 13 receives data on the tilt angle of the floor slab for evaluation, data on the top surface temperature of the floor slab for evaluation, and data on the bottom surface temperature of the floor slab for evaluation. The evaluation unit 13 substitutes the received data into the evaluation function f and calculates the evaluation value. The evaluation unit 13 determines whether or not the evaluation value is larger than the threshold value TH. When the evaluation unit 13 determines that the evaluation value is larger than the threshold value TH, the evaluation unit 13 evaluates the evaluation result as abnormal. That is, the evaluation unit 13 evaluates that the floor slab has deteriorated. When the evaluation unit 13 determines that the evaluation value is equal to or less than the threshold value TH, the evaluation unit 13 evaluates the evaluation result as normal. That is, the evaluation unit 13 evaluates that the floor slab has not deteriorated. As a result, the evaluation unit 13 can evaluate the deterioration state of the floor slab by excluding the influence of temperature. The evaluation unit 13 may use the evaluation value to evaluate how much the deck has deteriorated.

[Example of deterioration evaluation according to the example]
Next, an example of deterioration evaluation according to the embodiment will be described with reference to FIG. FIG. 6 is a diagram showing an example of deterioration evaluation according to an embodiment. In FIG. 6, deterioration evaluation of the floor slab is performed using the evaluation function f constructed by using the top surface temperature data 21 and the bottom surface temperature data 22 of FIG. 4 and the floor slab unit tilt angle data 25 of FIG. If this is the case. That is, the weight w1 of the evaluation function f is 0.0469, and the weight w2 is −0.0224.

The upper figure of FIG. 6 shows the evaluation function score (threshold value) calculated by the evaluation function construction unit 12. For example, the evaluation function construction unit 12 calculates the evaluation function score (threshold) of the evaluation function f using the following data for the evaluation function f. Regarding the evaluation function f, the floor slab single inclination angle θ is 0.14 degree, which is 1/400 of the residual deformation angle (tan θ) of the floor slab requiring countermeasure category, and the bottom surface temperature T1 is the lowest bottom surface temperature in the learning period. The upper surface temperature T2 is set to 3 ° C., and the upper surface temperature T2 is set to 4.55 ° C. at the observation point of the lower surface temperature T1. As a result, the evaluation function score (threshold value) TH is calculated as 0.18.

First, the evaluation function f and the threshold value TH are applied to the case of the sound floor slab (measure classification determination: A) of <1>. The observed tilt angle of the deck is 0.55 degree, the bottom temperature of the deck is 25 ° C, and the top temperature of the deck is 35 ° C. Then, the evaluation unit 13 substitutes 0.55 (degree) into θ, 25 (° C.) into T1, and 35 (° C.) into T2 for the evaluation function f, and calculates the evaluation function score. .. Here, the evaluation function score is calculated as 0.16.

Then, the evaluation unit 13 determines whether or not the evaluation function score is larger than the threshold value TH. Here, since the evaluation function score 0.16 is smaller than the threshold value 0.18, the evaluation unit 13 evaluates the evaluation result as “normal”. That is, the evaluation unit 13 evaluates that the floor slab has not deteriorated. Therefore, the evaluation result evaluated by the evaluation function f is the same as the actual result (healthy floor slab). In such a case, when the temperature rises as a whole, the deck bends, so that the evaluation result is determined to be normal even if the tilt angle of the deck alone becomes large.

Next, the evaluation function f and the threshold value TH are applied to the case of the unhealthy floor slab (measure classification determination: B) of <2>. The observed tilt angle of the deck is 0.65 degree, the bottom temperature of the deck is 30 ° C, and the top temperature of the deck is 43 ° C. Then, the evaluation unit 13 substitutes 0.65 (degree) for θ, 30 (° C.) for T1, and 43 (° C.) for T2 for the evaluation function f, and calculates the evaluation function score. .. Here, the evaluation function score is calculated as 0.21.

Then, the evaluation unit 13 determines whether or not the evaluation function score is larger than the threshold value TH. Here, since the evaluation function score 0.21 is larger than the threshold value 0.18, the evaluation unit 13 evaluates the evaluation result as “abnormal”. That is, the evaluation unit 13 evaluates that the floor slab has deteriorated. Therefore, the evaluation result evaluated by the evaluation function f is the same as the actual result (unhealthy floor slab). In such a case, when the upper surface temperature rises, the upper part expands, the lower part contracts, and the inclination angle of the deck becomes smaller than the actual one. In other words, when the top surface temperature rises, the deck becomes less likely to bend. If the deck is not deteriorated, the tilt angle (deflection) should be small, but the tilt angle is as large as 0.65 deg because the deck is deteriorated, and the evaluation result is abnormal. It is judged.

In the following, a reference example of deterioration evaluation when the evaluation function is constructed only with the bottom surface temperature without using the top surface temperature, and deterioration when the learning period is set to a period in which the relationship between the top surface temperature and the bottom surface temperature does not change. A reference example of evaluation will be described.

[Degradation evaluation when the evaluation function is constructed only with the bottom surface temperature]
FIG. 7 is a diagram showing a reference example of deterioration evaluation when the evaluation function is constructed only by the bottom surface temperature. The weight w1 of the evaluation function f is 0.0186, and the weight w2 is 0.

The upper figure of FIG. 7 shows the evaluation function score (threshold value) calculated by the evaluation function construction unit 12. For example, the evaluation function construction unit 12 calculates the evaluation function score (threshold) of the evaluation function f using the data shown in the upper figure of FIG. 6 for the evaluation function f. That is, for the evaluation function f, the single inclination angle θ is 0.14 degree, which is the residual deformation angle 1/400 radian (rad) of the floor slab requiring countermeasure category, and the bottom surface temperature T1 is the lowest bottom surface temperature 1 in the learning period. The upper surface temperature T2 is set to 0.3 ° C., and the upper surface temperature T2 is set to 4.55 ° C. at the observation point of the lower surface temperature T1. As a result, the evaluation function score (threshold value) TH is calculated as 0.12.

The evaluation function f and the threshold value TH are applied to the same deck as the sound deck of <1> shown in FIG. 6 (measure classification determination: A). That is, the observed single inclination angle of the deck is 0.55 degree, the bottom temperature of the deck is 25 ° C, and the top temperature of the deck is 35 ° C. Then, the evaluation unit 13 substitutes 0.55 (degree) into θ, 25 (° C.) into T1, and 35 (° C.) into T2 for the evaluation function f, and calculates the evaluation function score. .. Here, the evaluation function score is calculated as 0.085.

Then, the evaluation unit 13 determines whether or not the evaluation function score is larger than the threshold value TH. Here, since the evaluation function score 0.085 is smaller than the threshold value 0.12, the evaluation unit 13 evaluates the evaluation result as “normal”. That is, the evaluation unit 13 evaluates that the floor slab has not deteriorated. Therefore, the evaluation result evaluated by the evaluation function f is the same as the actual result (healthy floor slab).

Next, the evaluation function f and the threshold value TH are applied to the same floor slab as the unhealthy floor slab (countermeasure classification determination: B) shown in FIG. That is, the tilt angle of the floor slab alone is 0.65 degree, the bottom surface temperature of the floor slab is 30 ° C., and the top surface temperature of the floor slab is 43 ° C. Then, the evaluation unit 13 substitutes 0.65 (degree) for θ, 30 (° C.) for T1, and 43 (° C.) for T2 for the evaluation function f, and calculates the evaluation function score. .. Here, the evaluation function score is calculated as 0.09.

Then, the evaluation unit 13 determines whether or not the evaluation function score is larger than the threshold value TH. Here, since the evaluation function score 0.09 is smaller than the threshold value 0.12, the evaluation unit 13 evaluates the evaluation result as “normal”. That is, the evaluation unit 13 evaluates that the floor slab has not deteriorated. However, the evaluation result evaluated by the evaluation function f is inconsistent with the actual result (unhealthy floor slab). When the evaluation function is constructed only by the bottom surface temperature, if the top surface temperature rises, contradictory results are likely to occur.

[Degradation evaluation when the evaluation function is constructed only in the summer]
FIG. 8 is a diagram showing a reference example of deterioration evaluation when the evaluation function is constructed only in the summer. The weight w1 of the evaluation function f is −0.0078, and the weight w2 is 0.012.

The upper figure of FIG. 8 shows the evaluation function score (threshold value) calculated by the evaluation function construction unit 12. For example, the evaluation function construction unit 12 calculates the evaluation function score (threshold) of the evaluation function f using the following data for the evaluation function f. Regarding the evaluation function f, the single inclination angle θ is 0.14 degree, which is the residual deformation angle (tan θ) 1/400 of the floor slab requiring countermeasure category, and the bottom surface temperature T1 is the lowest bottom surface temperature in the summer learning period 22. The upper surface temperature T2 is set to 6 ° C., and the upper surface temperature T2 at the observation point of the lower surface temperature T1 is set to 29.4 ° C. As a result, the evaluation function score (threshold value) TH is calculated as −0.044. This is because the tilt angle of the floor slab alone in the training data includes many effects in the high temperature range (state in which the floor slab is bent), and the evaluation function score (threshold) becomes a negative value. ..

The evaluation function f and the threshold value TH are applied to the same deck as the sound deck of <1> shown in FIG. 6 (measure classification determination: A). That is, the observed single inclination angle of the deck is 0.55 degree, the bottom temperature of the deck is 25 ° C, and the top temperature of the deck is 35 ° C. Then, the evaluation unit 13 substitutes 0.55 (degree) into θ, 25 (° C.) into T1, and 35 (° C.) into T2 for the evaluation function f, and calculates the evaluation function score. .. Here, the evaluation function score is calculated as 0.032.

Then, the evaluation unit 13 determines whether or not the evaluation function score is larger than the threshold value TH. Here, since the evaluation function score 0.032 is larger than the threshold value −0.044, the evaluation unit 13 evaluates the evaluation result as “abnormal”. That is, the evaluation unit 13 evaluates that the floor slab has deteriorated. However, the evaluation result evaluated by the evaluation function f is inconsistent with the actual result (healthy floor slab). If the evaluation function is constructed only in the summer, a normal bridge will also be evaluated abnormally.

[Degradation evaluation when the evaluation function is constructed only in winter]
FIG. 9 is a diagram showing a reference example of deterioration evaluation when the evaluation function is constructed only in winter. The weight w1 of the evaluation function f is 0.0078, and the weight w2 is −0.0016.

The upper figure of FIG. 9 shows the evaluation function score (threshold value) calculated by the evaluation function construction unit 12. For example, the evaluation function construction unit 12 calculates the evaluation function score (threshold) of the evaluation function f using the data shown in the upper figure of FIG. 6 for the evaluation function f. That is, for the evaluation function f, the single inclination angle θ is 0.14 degree, which is the residual deformation angle 1/400 radian (rad) of the floor slab requiring countermeasure category, and the bottom surface temperature T1 is the lowest bottom surface temperature 1 in the learning period. The upper surface temperature T2 is set to 0.3 ° C., and the upper surface temperature T2 is set to 4.55 ° C. at the observation point of the lower surface temperature T1. As a result, the evaluation function score (threshold value) TH is calculated as 0.14.

The evaluation function f and the threshold value TH are applied to the case where the floor slab (measure classification determination: A) is sound in <3>. The observed tilt angle of the deck is 0.13 degree, the bottom temperature of the deck is 8.8 ° C, and the top temperature of the deck is 11 ° C. Then, the evaluation unit 13 substitutes 0.13 (degree) for θ, 8.8 (° C) for T1, and 11 (° C) for T2 for the evaluation function f, and obtains the evaluation function score. calculate. Here, the evaluation function score is calculated as 0.079.

Then, the evaluation unit 13 determines whether or not the evaluation function score is larger than the threshold value TH. Here, since the evaluation function score 0.078 is smaller than the threshold value 0.14, the evaluation unit 13 evaluates the evaluation result as “normal”. That is, the evaluation unit 13 evaluates that the floor slab has not deteriorated. Therefore, the evaluation result evaluated by the evaluation function f is the same as the actual result (healthy floor slab).

Next, the evaluation function f and the threshold value TH are applied to the same deck as the sound deck of <1> shown in FIG. 6 (measure classification determination: A). That is, the observed single inclination angle of the deck is 0.55 degree, the bottom temperature of the deck is 25 ° C, and the top temperature of the deck is 35 ° C. Then, the evaluation unit 13 substitutes 0.55 (degree) into θ, 25 (° C.) into T1, and 35 (° C.) into T2 for the evaluation function f, and calculates the evaluation function score. .. Here, the evaluation function score is calculated as 0.41.

Then, the evaluation unit 13 determines whether or not the evaluation function score is larger than the threshold value TH. Here, since the evaluation function score 0.41 is larger than the threshold value 0.14, the evaluation unit 13 evaluates the evaluation result as “abnormal”. That is, the evaluation unit 13 evaluates that the floor slab has deteriorated. Therefore, the evaluation result evaluated by the evaluation function f is inconsistent with the actual result (healthy floor slab).

If the evaluation function is constructed only in winter, normal evaluation can be performed in winter, but normal evaluation cannot be performed in summer because the temperature in summer is not taken into consideration.

Therefore, the evaluation function construction unit 12 constructs the evaluation function f by using the upper surface temperature, the lower surface temperature, and the floor slab unit tilt angle during the learning period such that the relationship between the upper surface temperature and the lower surface temperature of the deck B1 changes. It is necessary.

[Flowchart of data acquisition process]
Next, a flowchart of the data acquisition process according to the embodiment will be described with reference to FIG. FIG. 10 is a diagram showing an example of a flowchart of the data acquisition process according to the embodiment. The tilt sensor 3-1 is installed on the girder B2, and the tilt sensor 3-2 is installed on the lower surface of the deck B1. The temperature sensor 2-1 is installed on the upper surface of the floor slab B1, and the temperature sensor 2-2 is installed on the lower surface of the floor slab B1.

As shown in FIG. 10, the data acquisition unit 11 monitors the tilt sensors 3-1 and 3-2 (step S11). The data acquisition unit 11 uses the monitored tilt angle data to determine whether or not the vehicle is not traveling (step S12). When it is determined that the vehicle is not running (step S12; No), the data acquisition unit 11 repeats the determination process until the vehicle is not running.

On the other hand, when it is determined that the vehicle is not traveling (step S12; Yes), the data acquisition unit 11 is the inclination sensor 3-1 installed on the girder B2 and the inclination sensor installed on the lower surface of the deck B1. The tilt angle data is acquired from 3-2 (step S13). Then, the data acquisition unit 11 acquires temperature data of the floor slab B1 from the temperature sensor 2-1 installed on the upper surface and the temperature sensor 2-2 installed on the lower surface, respectively (step S14).

Then, the data acquisition unit 11 acquires date and time data from, for example, the control unit 10 (step S15). Then, the data acquisition unit 11 stores the acquired tilt angle data and temperature data as learning data in the storage unit 20 in association with the date and time data (step S16). That is, the data acquisition unit 11 stores the upper surface temperature in the upper surface temperature data 21 and the lower surface temperature in the lower surface temperature data 22. The data acquisition unit 11 stores the tilt angle data acquired from the tilt sensor 3-1 installed in the girder B2 in the girder tilt angle data 23, and acquires it from the tilt sensor 3-2 installed on the upper surface of the floor slab B1. The tilt angle data is stored in the floor slab tilt angle data 24.

Then, the data acquisition unit 11 determines whether or not the monitoring of the tilt sensors 3-1 and 3-2 has been stopped (step S17). If it is determined that the monitoring has not been stopped (step S17; No), the data acquisition unit 11 proceeds to step S11 for monitoring.

On the other hand, if it is determined that the monitoring has been stopped (step S17; Yes), the data acquisition unit 11 ends the data acquisition process.

[Flowchart of evaluation function construction process]
Next, a flowchart of the evaluation function construction process according to the embodiment will be described with reference to FIG. FIG. 11 is a diagram showing an example of a flowchart of the evaluation function construction process according to the embodiment. It should be noted that the floor slab tilt angle data 24, the girder tilt angle data 23, and the bottom surface temperature are for a period in which the relationship between the learning tilt data and the learning temperature data changes between the temperature of the upper surface and the temperature of the lower surface of the floor slab B1. It is assumed that the data 22 and the top surface temperature data 21 are stored.

The evaluation function construction unit 12 reads the learning inclination data from the girder inclination angle data 23 and the deck inclination angle data 24 (step S21). The evaluation function construction unit 12 reads the learning temperature data from the upper surface temperature data 21 and the lower surface temperature data 22 (step S22).

Then, the evaluation function construction unit 12 calculates the floor slab unit inclination θ for each of the same observation points using the read inclination data for learning (step S23). For example, the evaluation function construction unit 12 calculates a value obtained by subtracting the inclination angle of the girder B2 from the inclination angle of the deck B1 at the same observation point as the inclination angle θ of the floor slab B1 alone at this observation point. Then, the evaluation function construction unit 12 stores the inclination angle θ of the floor slab B1 alone in the floor slab unit inclination angle data 25 as learning inclination data.

Then, the evaluation function construction unit 12 calculates the daily average of all the data of the temperature data for learning and the inclination data for learning (step S24).

Subsequently, the evaluation function construction unit 12 calculates a linear approximation of the deck single inclination angle using the learning inclination data (step S25). For example, the evaluation function construction unit 12 calculates α ₀ , β ₀ of the linear combination α ₀ t + β ₀ with the time t as a variable, using the daily average of the deck single tilt angle data 25.

Then, the evaluation function construction unit 12 calculates a linear approximation of the upper surface temperature and the lower surface temperature using the learning temperature data (step S26). For example, the evaluation function construction unit 12 calculates α ₁ and β ₁ of the linear combination α ₁ t + β ₁ with the time t as a variable by using the daily average of the bottom surface temperature data 22. The evaluation function construction unit 12 calculates α ₂ and β ₂ of the linear combination α ₂ t + β ₂ with the time t as a variable by using the daily average of the top surface temperature data 21.

Then, the evaluation function construction unit 12 determines the weights w1 and w2 of the evaluation function represented by the equation (1) from the constraint conditions (step S27). For example, the evaluation function construction unit 12 substitutes the linear combination α ₀ t + β ₀ for θ in the equation (1), substitutes the linear combination α ₁ t + β ₁ for T 1 in the equation (1), and substitutes T 2 in the equation (1). Substituting the linear combination α ₂ t + β ₂ and outputting the equation (2). The evaluation function construction unit 12 outputs the constraint condition of the equation (3) in order to solve the equation (2). In addition, the evaluation function construction unit 12 outputs the constraint condition of the equation (4) in order to solve the equation (2). Then, the evaluation function construction unit 12 calculates w1 and w2 from the constraint condition of the equation (3) and the constraint condition of the equation (4).

Then, the evaluation function construction unit 12 defines the threshold value TH of the evaluation function represented by the equation (1) (step S28). For example, for the evaluation function, the evaluation function construction unit 12 substitutes the residual deformation angle of the floor slab requiring countermeasure category into the single tilt angle θ, substitutes the lowest bottom surface temperature of the observation section (learning period) into T1, and substitutes T1 for the evaluation function. Substituting the top surface temperature of the observation point into T2, the threshold TH of the evaluation function is calculated. The residual deformation angle of the floor slab requiring countermeasure category is, for example, 0.14.

Then, the evaluation function construction unit 12 ends the evaluation function construction process.

[Flowchart of evaluation process]
Next, a flowchart of the evaluation process according to the embodiment will be described with reference to FIG. FIG. 12 is a diagram showing an example of a flowchart of the evaluation process according to the embodiment. It is assumed that the evaluation function f (θ, T1, T2) represented by the equation (1) is constructed. Further, it is assumed that the threshold value TH of the evaluation function f is defined.

The evaluation unit 13 reads the inclination data θ for evaluation (step S31). The inclination data referred to here is the inclination angle of the floor slab alone. The evaluation unit 13 reads the temperature data T1 and T2 for evaluation (step S32). The temperature data T1 referred to here is the bottom surface temperature of the deck, and the temperature data T2 is the top surface temperature of the deck.

Then, the evaluation unit 13 substitutes the inclination data θ for evaluation and the temperature data T1 and T2 for evaluation into the evaluation function f (θ, T1, T2) represented by the equation (1) to calculate the evaluation value. (Step S33).

Then, the evaluation unit 13 determines whether or not the evaluation value, which is the calculation result of f (θ, T1, T2), is larger than the threshold value TH (step S34). When it is determined that the evaluation value which is the calculation result of f (θ, T1, T2) is equal to or less than the threshold value TH (step S34; No), the evaluation unit 13 evaluates the evaluation result as normal (step S35). .. That is, the evaluation unit 13 evaluates that the floor slab has not deteriorated.

On the other hand, when it is determined that the evaluation value which is the calculation result of f (θ, T1, T2) is larger than the threshold value TH (step S34; Yes), the evaluation unit 13 evaluates the evaluation result as abnormal (step S36). ). That is, the evaluation unit 13 evaluates that the floor slab has deteriorated.

Then, the evaluation unit 13 ends the evaluation process.

[Effect of Examples]
According to the above embodiment, the deterioration evaluation device 1 includes temperature information on the upper surface and the lower surface of the floor slab to be evaluated for evaluating deterioration, and tilt information by the girder to be evaluated and the tilt sensor installed on the floor slab. The observation data is acquired for a period in which the relationship between the temperature of the upper surface and the temperature of the lower surface changes. The deterioration evaluation device 1 constructs a prediction model regarding the tilt angle of a single deck slab and the relationship between the temperature of the upper surface and the temperature of the lower surface of the deck from the observation data. The deterioration evaluation device 1 evaluates the deterioration of the deck using the prediction model. According to such a configuration, the deterioration evaluation device 1 can evaluate, for example, the deterioration state of the deck of a bridge, excluding the influence of temperature.

Further, according to the above embodiment, the deterioration evaluation device 1 processes the temperature information in the observation data into the temperature information of the average daily temperature, and constructs a prediction model using the processed temperature information. According to such a configuration, the deterioration evaluation device 1 can efficiently construct the prediction model by processing the temperature information into the temperature information of the average daily temperature when constructing the prediction model. ..

Further, according to the above embodiment, the period for acquiring observation data is a period including a summer period and a winter period. According to such a configuration, the deterioration evaluation device 1 can construct a general-purpose prediction model in both summer and winter.

Further, according to the above embodiment, when the evaluation target is a bridge, the deterioration evaluation device 1 acquires observation data in a state where the vehicle does not pass through the bridge. According to such a configuration, the deterioration evaluation device 1 can construct an accurate prediction model.

[others]
In the embodiment, the deterioration evaluation device 1 constructs a prediction model for the deterioration of the deck using the inclination angle of the deck of the bridge and the temperature above and below the deck, and uses the prediction model to construct a prediction model for the bridge. Evaluate the deterioration of the deck. However, the deterioration evaluation device 1 does not limit the evaluation target to the deck of the bridge, but predicts the deterioration of the deck using the temperature above and below the deck, targeting the deck of the high bridge and the deck of the pedestrian bridge. A model may be constructed and the predicted model may be used to evaluate the deterioration of the corresponding deck. Further, the deterioration evaluation device 1 may evaluate the floor slab of the house.

Further, each component of the illustrated deterioration evaluation device 1 does not necessarily have to be physically configured as shown in the figure. That is, the specific embodiment of the dispersion / integration of the deterioration evaluation device 1 is not limited to the one shown in the figure, and all or part of the dispersion / integration may be functionally or physically in any unit according to various loads and usage conditions. It can be distributed and integrated. For example, the data acquisition unit 11 and the evaluation function construction unit 12 may be integrated as one unit. Further, the evaluation function construction unit 12 may be separated into a processing unit that processes the learning data and a construction unit that constructs a prediction model (evaluation function) from the learning data after processing. Further, the storage unit 20 may be connected via a network as an external device of the deterioration evaluation device 1.

Further, the various processes described in the above embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. Therefore, in the following, an example of a computer that executes a deterioration evaluation program that realizes the same functions as the deterioration evaluation device 1 shown in FIG. 1 will be described. FIG. 13 is a diagram showing an example of a computer that executes a deterioration evaluation program.

As shown in FIG. 13, the computer 200 includes a CPU 203 that executes various arithmetic processes, an input device 215 that receives data input from a user, and a display control unit 207 that controls the display device 209. Further, the computer 200 has a drive device 213 for reading a program or the like from a storage medium, and a communication control unit 217 for exchanging data with another computer via a network. Further, the computer 200 has a memory 201 for temporarily storing various information and an HDD (Hard Disk Drive) 205. The memory 201, CPU 203, HDD 205, display control unit 207, drive device 213, input device 215, and communication control unit 217 are connected by a bus 219.

The drive device 213 is, for example, a device for the removable disk 210. The HDD 205 stores the deterioration evaluation program 205a and the deterioration evaluation processing related information 205b.

The CPU 203 reads the deterioration evaluation program 205a, expands it into the memory 201, and executes it as a process. Such a process corresponds to each functional unit of the deterioration evaluation device 1. The deterioration evaluation processing related information 205b corresponds to the top surface temperature data 21, the bottom surface temperature data 22, the girder tilt angle data 23, the deck tilt angle data 24, the deck single tilt angle data 25, and the evaluation model 26. Then, for example, the removable disk 210 stores each information such as the deterioration evaluation program 205a.

The deterioration evaluation program 205a does not necessarily have to be stored in the HDD 205 from the beginning. For example, a "portable physical medium" such as a flexible disk (FD), a CD-ROM (Compact Disk Read Only Memory), a DVD (Digital Versatile Disk), a magneto-optical disk, or an IC (Integrated Circuit) card inserted into a computer 200. ”Remembers the program. Then, the computer 200 may read the deterioration evaluation program 205a from these and execute it.

1 Deterioration evaluation device 10 Control unit 11 Data acquisition unit 12 Evaluation function construction unit 13 Evaluation unit 20 Storage unit 21 Top surface temperature data 22 Bottom surface temperature data 23 Digit tilt angle data 24 Floor slab tilt angle data 25 Floor slab unit tilt angle data 26 Evaluation model

Claims (6)

On the computer
Observation data including the temperature information of the upper surface and the lower surface of the deck to be evaluated for evaluating deterioration and the tilt information by the girder of the evaluation target and the tilt sensor installed on the deck are obtained from the temperature of the upper surface and the lower surface. Obtained for a period in which the relationship with temperature changes,
From the observation data, a prediction model regarding the inclination angle of the single floor slab and the relationship between the temperature of the upper surface of the floor slab and the temperature of the lower surface was constructed.
A deterioration evaluation program that executes a process for evaluating the deterioration of the deck using the prediction model. The processing to be constructed is characterized in that the temperature information in the observation data is processed into the temperature information of the average daily temperature, and the predicted model is constructed using the processed temperature information. The deterioration evaluation program according to Item 1. The deterioration evaluation program according to claim 1, wherein the period includes a summer period and a winter period. The deterioration evaluation program according to claim 1, wherein the acquisition process acquires the observation data in a state where the vehicle does not pass through the bridge when the evaluation target is a bridge. Observation data including the temperature information of the upper surface and the lower surface of the floor slab to be evaluated for evaluating deterioration and the inclination information by the girder of the evaluation target and the inclination sensor installed on the floor slab are obtained from the temperature of the upper surface and the lower surface. The acquisition unit that acquires the period for which the relationship with the temperature changes,
From the observation data acquired by the acquisition unit, a construction unit that constructs a prediction model regarding the tilt angle of the single unit of the deck and the relationship between the temperature of the upper surface of the deck and the temperature of the lower surface of the deck.
An evaluation unit that evaluates the deterioration of the deck using the prediction model constructed by the construction unit, and an evaluation unit.
Deterioration evaluation device characterized by having. Observation data including the temperature information of the upper surface and the lower surface of the deck to be evaluated for evaluating deterioration and the tilt information by the girder of the evaluation target and the tilt sensor installed on the deck are obtained from the temperature of the upper surface and the lower surface. Obtained for a period in which the relationship with temperature changes,
From the observation data, a prediction model regarding the inclination angle of the single floor slab and the relationship between the temperature of the upper surface of the floor slab and the temperature of the lower surface was constructed.
A deterioration evaluation method in which a computer executes a process of evaluating the deterioration of the deck using the prediction model.

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