JP2024039813A - Non-destructive testing equipment and non-destructive testing method - Google Patents

Abstract

[Problem] The objective is to provide a non-destructive inspection device 10 and a non-destructive inspection method that can accurately detect a deformed portion 2 of a concrete structure 1. [Solution] The non-destructive inspection device 10 performs non-destructive inspection of a concrete structure 1 to detect a deformed portion 2, and is characterized by comprising a transducer 11 that vibrates the surface of the concrete structure 1 at an ultrasonic frequency for a predetermined vibration time, temperature measuring means (infrared camera 13 and analysis terminal 20) that measures the temperature of the concrete structure 1 and acquires it as temperature information 25a, a control unit 26 that, after vibration by the transducer 11, vibrates the concrete structure 1 using the transducer 11 with a changed ultrasonic frequency, and output means (display unit 22 and control unit 26) that outputs a thermographic image based on the temperature information 25a acquired by the temperature measuring means. [Selected Figure] Figure 3

Description

The present invention relates to a non-destructive inspection device and a non-destructive inspection method for non-destructively inspecting deformed parts such as cracks and voids that occur inside a concrete structure.

Conventionally, concrete structures such as buildings and bridges need to be periodically inspected for cracks caused by aging or vibration, for example, in order to prevent unintended defects. For such inspections, non-destructive inspection devices have been proposed that non-destructively inspect concrete structures.

For example, Patent Document 1 discloses a non-destructive device that includes a transmitting probe that continuously vibrates the surface of a concrete structure at an ultrasonic frequency and a receiving probe that receives reflected waves reflected inside the concrete structure. An inspection device is disclosed.
In Patent Document 1, reflected waves received by a receiving probe are averaged to obtain an output waveform, and a worker, for example, reads the peak of the obtained output waveform to detect plate thickness or internal defects. There is.

By the way, in the case of a nondestructive inspection device that receives reflected waves reflected inside a concrete structure, it is known that a large amount of noise tends to be mixed into the received reflected waves due to the influence of aggregate in the concrete.
For this reason, in the non-destructive testing apparatus as disclosed in Patent Document 1, deformed parts such as cracks may not be accurately detected due to a large amount of noise mixed into the reflected waves.

Japanese Patent Application Publication No. 2004-184276

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a non-destructive inspection device and a non-destructive inspection method that can accurately detect deformed parts of concrete structures.

The present invention is a non-destructive inspection device for non-destructively inspecting a concrete structure to detect deformed parts, the invention being a non-destructive inspection device that vibrates the surface of the concrete structure at an ultrasonic frequency for a predetermined vibration time. a temperature measurement means for measuring the temperature of the concrete structure and acquiring it as temperature information; and after the vibration by the vibrator, the vibrator vibrates the concrete structure by changing the ultrasonic frequency. The method is characterized by comprising a repeating unit for causing execution, and an output unit for outputting output information based on the temperature information acquired by the temperature measuring unit.

The present invention also provides a non-destructive testing method for detecting deformed parts by non-destructively testing a concrete structure, in which a vibrator scans the surface of the concrete structure using ultrasonic waves for a predetermined excitation time. a temperature measuring step in which a temperature measuring means measures the temperature of the concrete structure and acquires it as temperature information; and a temperature measuring step in which the temperature of the concrete structure is measured by a temperature measuring means and the ultrasonic frequency is changed after being vibrated by the vibrator. and an output step in which the output means outputs output information based on the temperature information acquired by the temperature measuring means. .

The above-mentioned concrete structures refer to buildings, bridges, test pieces used for strength tests, etc.
The above-mentioned deformed parts refer to cracks, voids, initial defects, etc. that occur on the surface or inside of the concrete structure.
The above-mentioned vibration time is a relatively short time, for example, 10 seconds or less.

The above output information includes temperature information itself, still images such as moving images and graphs showing temperature changes in concrete structures, character string data showing temperature changes and temperatures, data for printing temperature information on paper media, or Refers to information indicating the presence or absence and location of a deformed part.
The output means refers to a display means for displaying output information, a printing means for printing output information on a paper medium, an output means for outputting output information on a storage medium, and the like.

According to this invention, a deformed portion of a concrete structure can be detected with high accuracy based on a temperature change occurring in the deformed portion of the concrete structure.
Specifically, when a vibrator excites the surface of a concrete structure at an ultrasonic frequency, the ultrasonic vibrations propagated inside the concrete structure cause a temperature change in the deformed part inside the concrete structure. can be caused.

For example, if the deformed portion is a crack, ultrasonic vibration can cause the fracture surfaces of the crack to rub against each other and generate frictional heat. Alternatively, if the deformed portion is a void where moisture has accumulated, ultrasonic vibration can cause cavitation in the moisture within the void to generate heat.

At this time, the nondestructive testing device needs to vibrate the surface of the concrete structure at an ultrasonic frequency suitable for generating heat in the deformed part.
Therefore, the non-destructive testing equipment is equipped with a repeating means that vibrates the concrete structure using the vibrator with a different ultrasonic frequency after the vibrator has vibrated the concrete structure. It can also be applied inside the object.

Thereby, the non-destructive testing device can reliably apply ultrasonic vibration suitable for causing a temperature change to the deformed portion of the concrete structure. Therefore, the non-destructive testing device can reliably cause a temperature change in the deformed portion even if the deformed portion is in the state of a crack or a void filled with moisture.
The nondestructive inspection device can detect a deformed portion of the concrete structure by using the temperature measurement means to measure local temperature changes in the concrete structure.

Therefore, non-destructive testing equipment and non-destructive testing methods using the same are less susceptible to noise than, for example, detecting deformed parts based on reflected waves inside concrete structures. Deformed parts of concrete structures can be detected with high accuracy.

In addition, since it is equipped with an output means that outputs output information based on the temperature information acquired by the temperature measurement means, the non-destructive testing device can display local temperature changes caused by excitation, for example, on the display means. It can be displayed.

For this reason, non-destructive testing equipment makes it easier for workers to determine the presence or absence of deformed parts, compared to, for example, when workers judge the presence or absence of deformed parts by reading output waveforms based on reflected waves. be able to.

As an aspect of the present invention, there is provided a calculation means for calculating an amount of temperature change for each of the ultrasonic frequencies based on the temperature information acquired by the temperature measurement means; frequency determining means for determining the ultrasonic frequency with the largest amount of temperature change as a determination frequency to be used for determining the deformed portion; It may also be configured to output output information.

The above-mentioned temperature change amount refers to a temperature gradient between a heat generating part and its surroundings, a temperature difference occurring in a predetermined excitation time, or a temperature change rate with respect to a predetermined excitation time.
The above-mentioned determination of the deformed portion refers to determination of the presence or absence of the deformed portion and/or determination of the position of the deformed portion.

According to this configuration, even when the surface of the concrete structure is vibrated by changing the ultrasonic frequency, a deformed portion of the concrete structure can be detected accurately and efficiently.
Specifically, the temperature change in the deformed part becomes the largest when optimal ultrasonic vibration acts on the deformed part.

Therefore, by calculating the amount of temperature change for each ultrasonic frequency based on the temperature information acquired by the temperature measuring means, the non-destructive inspection equipment can easily identify the temperature information that causes the largest temperature change in the deformed part. can do.

Then, the ultrasonic frequency with the largest amount of temperature change is set as the judgment frequency used to judge the deformed part, and by outputting output information based on the temperature information at the judgment frequency, the non-destructive inspection device can, for example, This makes it easier to determine the presence or absence of a deformed portion.

Therefore, the non-destructive testing device can accurately and efficiently detect a deformed portion of a concrete structure even when the ultrasonic frequency is changed to vibrate the surface of the concrete structure.

Further, as an aspect of the present invention, the calculation means may be configured to calculate a temperature difference generated during the excitation time as the temperature change amount.
According to this configuration, since the temperature difference generated during the excitation time is calculated as the amount of temperature change, it is possible to easily calculate the amount of temperature change. Therefore, the non-destructive inspection device can efficiently detect deformed parts.

Further, as an aspect of the present invention, the calculation means may be configured to calculate a rate of temperature change with respect to the excitation time as the amount of temperature change.
According to this configuration, since the rate of temperature change with respect to the excitation time is calculated as the amount of temperature change, for example, even if the temperature difference generated during the excitation time is the same, the determination frequency is determined based on the rate of temperature change. be able to. Therefore, the non-destructive inspection device can detect deformed parts of the concrete structure with higher accuracy.

Further, as an aspect of the present invention, an operation receiving means for receiving an input operation of the ultrasonic frequency may be provided.
According to this configuration, since the operation accepting means can receive an input operation of an ultrasonic frequency, the surface of the concrete structure can be excited with an arbitrary ultrasonic frequency.

Thereby, the non-destructive testing device can reliably apply ultrasonic vibration suitable for causing a temperature change to the deformed portion of the concrete structure. Therefore, the non-destructive inspection device can detect deformed parts of the concrete structure with higher accuracy.

Further, as an aspect of the present invention, the temperature measurement means may be configured with a thermography device that acquires temperature distribution on the surface of the concrete structure as the temperature information.
According to this configuration, since the temperature measurement means is composed of a thermography device that acquires the temperature distribution on the surface of the concrete structure as temperature information, it is possible to It is possible to efficiently and accurately measure local temperature changes.

Further, as an aspect of the present invention, the repeating means may be configured to cause the concrete structure to be vibrated by the vibrator with the ultrasonic frequency changed after a predetermined standby time has elapsed.

According to this configuration, by providing a predetermined standby time, it is possible to lower the temperature of the concrete structure, which has risen in temperature due to excitation at the ultrasonic frequency before the change. Therefore, the non-destructive testing device can prevent the concrete structure in a heated state from being vibrated at the changed ultrasonic frequency.

Thereby, the non-destructive inspection device can measure local temperature changes of the concrete structure with higher accuracy than when no standby time is provided.
Therefore, the non-destructive inspection device can detect deformed parts of concrete structures with higher accuracy.

Further, as an aspect of the present invention, a determining means may be provided for determining the presence or absence of the deformed portion of the concrete structure based on the temperature information at the determination frequency.
According to this configuration, the determination means determines the presence or absence of a deformed part in the concrete structure based on the temperature information at the determination frequency. Compared to the case of determining the presence or absence of a deformed portion, it is possible to efficiently determine the presence or absence of a deformed portion while suppressing determination variations.
Furthermore, since the determination is made based on temperature information at the determination frequency, that is, temperature information with clear temperature changes, the non-destructive inspection apparatus can accurately determine the presence or absence of a deformed portion.

Further, as an aspect of the present invention, the determination means may specify the position of the deformed portion of the concrete structure based on the temperature information at the determination frequency.
According to this configuration, the determination means identifies the position of the deformed part of the concrete structure based on the temperature information at the determination frequency, so that, for example, a worker can locate the deformed part based on the visualized temperature information. Compared to the case where the position of the deformed part is specified, the burden on the worker is reduced and the position of the deformed part can be specified efficiently.

According to the present invention, it is possible to provide a nondestructive inspection device and a nondestructive inspection method that can accurately detect deformed portions of concrete structures.

FIG. 1 is a configuration diagram showing the configuration of a non-destructive testing device. An explanatory diagram illustrating a deformed part of a concrete structure. FIG. 2 is a block diagram showing the internal configuration of a non-destructive testing device. 2 is a flowchart showing the operation of analysis processing on an analysis terminal. An explanatory diagram for comparing and explaining the external appearance and internal state of a concrete structure. Thermography image of a deformed area that contains moisture. FIG. 3 is a configuration diagram showing the configuration of a non-destructive testing device in Example 2. FIG. 3 is a block diagram showing the internal configuration of a non-destructive testing device in Example 2. FIG. Flowchart showing a work procedure performed by a worker. 2 is a flowchart showing the operation of analysis processing on an analysis terminal. 5 is a flowchart showing the operation of vibration processing in an ultrasonic oscillator. FIG. 7 is an explanatory diagram illustrating a process of calculating a temperature change amount. FIG. 7 is an explanatory diagram illustrating another output form of temperature information.

An embodiment of this invention will be described below with reference to the drawings.

Embodiment 1 describes a non-destructive testing device 10 for non-destructively testing deformed parts 2 such as cracks and voids generated inside a concrete structure 1, and a non-destructive testing method using the same, as shown in FIG. This will be explained using FIG. 4.

Note that FIG. 1 shows a configuration diagram of the non-destructive testing device 10, FIG. 2 shows an explanatory diagram for explaining the deformed part 2 of the concrete structure 1, and FIG. 3 shows a block diagram of the non-destructive testing device 10. FIG. 4 shows a flowchart of analysis processing at the analysis terminal 20.

First, a concrete structure 1 is a test piece having a size specified by, for example, the Japanese Industrial Standards, and as shown in FIG. 1, a deformed portion 2, which is an initial defect, has occurred inside the concrete structure 1.

This deformed part 2 may be, for example, a crack 2a in which the fractured surfaces are in contact with each other, as shown in FIG. 2(a), or a gap in which the fractured surfaces are spaced apart, as shown in FIG. 2(b). 2b etc. Note that moisture 2c remains in the void 2b.

A non-destructive testing device 10 that performs a non-destructive test on such a concrete structure 1 vibrates the surface of the concrete structure 1, measures temperature changes in the concrete structure 1 due to the vibration, and detects deformed parts. This is a device that detects 2.

As shown in FIGS. 1 and 3, this non-destructive testing device 10 includes a vibrator 11 that vibrates the surface of a concrete structure 1 at a predetermined frequency, an oscillating unit 12 to which the vibrator 11 is connected, and a concrete structure It includes an infrared camera 13 that images the surface of the object 1, and an analysis terminal 20 to which the oscillation unit 12 and the infrared camera 13 are connected.

Specifically, as shown in FIG. 1, the vibrator 11 of the non-destructive testing device 10 includes a vibrator body 11a that generates ultrasonic waves based on a drive signal from an oscillating unit 12, and a vibrator body 11a that is attached to the vibrator body 11a. , and a horn 11b that amplifies the ultrasonic waves generated by the vibrator main body 11a.

Further, as shown in FIG. 3, the oscillation unit 12 of the non-destructive testing device 10 is connected to the vibrator 11 and the analysis terminal 20, and outputs a drive signal to the vibrator 11 based on a control signal from the analysis terminal 20. It has a function.

The infrared camera 13 of the non-destructive testing device 10 is a camera that is sensitive to infrared rays, and together with the analysis terminal 20 constitutes a so-called thermography device. This infrared camera 13 is provided to image temperature changes on the surface of the concrete structure 1.

Further, as shown in FIG. 3, the analysis terminal 20 of the non-destructive testing apparatus 10 includes an operation reception section 21 that receives operations from a worker, a display section 22 that displays various information, and a vibrator via an oscillation section 12. 11 is connected to the vibrator connecting portion 23.
Furthermore, as shown in FIG. 3, the analysis terminal 20 includes a camera connection section 24 to which the infrared camera 13 is connected, a storage section 25 that stores various information, and a control section 26 that controls these operations. There is.

Specifically, as shown in FIG. 1, the operation reception unit 21 of the analysis terminal 20 is composed of, for example, a keyboard 21a and a mouse 21b, and has a function of accepting input operations by a worker and information indicating the received input contents. It has a function of outputting the information to the control unit 26.
Further, the display section 22 of the analysis terminal 20 is composed of, for example, a liquid crystal display, and has a function of displaying various information based on control signals from the control section 26.

The transducer connection unit 23 of the analysis terminal 20 is configured with an input/output terminal such as a USB, and has a function of connecting to the oscillation unit 12 and a function of exchanging various information with the oscillation unit 12. are doing.
Furthermore, the camera connection unit 24 of the analysis terminal 20 is configured with an input/output terminal such as a USB, and has a function of connecting to the infrared camera 13 and a function of exchanging various information with the infrared camera 13. ing.

Furthermore, the storage unit 25 of the analysis terminal 20 is composed of a hard disk or a non-volatile memory, and has a function of writing and storing various information and a function of reading various information.
This storage unit 25 includes a program (not shown) that analyzes and visualizes a moving image captured by the infrared camera 13, a program (not shown) that executes an analysis process that will be described later, and a plurality of temperature information 25a that will be described later. I remember things like that.

Further, the control unit 26 of the analysis terminal 20 is composed of hardware such as a CPU and memory, and software such as a control program.
The control unit 26 has a processing function related to the exchange of various signals with the oscillation unit 12 and the infrared camera 13, a processing function related to the exchange of various signals with the operation reception unit 21, the display unit 22, and the storage unit 25, and a predetermined function. It has the function of controlling the operation of each part connected via the bus.

Further, the control unit 26 has a function of creating a thermography image based on a moving image acquired from the infrared camera 13, a function of detecting a change in the surface temperature of the concrete structure 1, and a function of detecting a change in the surface temperature of the concrete structure 1, and a function of detecting a change in the deformed portion 2 based on the temperature change. It has a function to determine the presence or absence of.

Next, processing operations when non-destructively inspecting the concrete structure 1 using the above-mentioned non-destructive inspection apparatus 10 will be explained using FIG. 4.
First, as shown in FIG. 1, the worker places the vibrator 11 at a desired excitation position and brings the tip of the horn 11b into contact with the surface of the concrete structure 1.

Furthermore, the worker places the infrared camera 13 facing the surface of the concrete structure 1 so that the vibrator 11 is located at the center of the imaging range of the infrared camera 13, and then operates the analysis terminal 20 to process the analysis. start.

When the worker starts the analysis process, the control unit 26 of the analysis terminal 20 displays a setting screen (not shown) on the display unit 22 that prompts the worker to enter the vibration conditions, as shown in FIG. An input operation is accepted (step S101).

Although detailed illustrations are omitted, the setting screen displays multiple input fields for selecting and inputting the frequency of ultrasonic waves to be applied to the concrete structure 1, a start button for starting non-destructive testing, etc. ing.

When the setting screen is displayed on the display unit 22, the worker selects and inputs a plurality of ultrasonic frequencies according to the instructions on the setting screen displayed on the display unit 22, and then presses the start button. For example, the worker selects and inputs 20 kHz, 30 kHz, and 40 kHz as the ultrasonic frequency, and then presses the start button.

When the setting screen is displayed on the display unit 22 in step S101 of FIG. 4, the control unit 26 determines whether the start button has been pressed by the worker (step S102). If the start button is not pressed (step S102: No), the control unit 26 waits for processing until the start button is pressed.

On the other hand, if the start button is pressed (step S102: Yes), the control unit 26 starts measuring the temperature of the concrete structure 1 after storing the plurality of ultrasonic frequencies input in step S101 in the storage unit 25. (Step S103).

Specifically, in response to instructions from the control unit 26, the infrared camera 13 starts capturing images of temperature changes on the surface of the concrete structure 1, and outputs the captured moving images to the analysis terminal 20.
After acquiring the moving images from the infrared camera 13, the control unit 26 sequentially temporarily stores the moving images from the infrared camera 13 as data showing temperature changes in the concrete structure 1 in time series.

When temperature measurement of the concrete structure 1 is started, the control unit 26 starts vibrating the concrete structure 1 at an ultrasonic frequency, as shown in FIG. 4 (step S104).
Specifically, the control unit 26 reads one of the plurality of ultrasound frequencies received in step S101 from the storage unit 25 and temporarily stores it.

Further, the control unit 26 outputs a control signal associated with the temporarily stored ultrasonic frequency to the oscillation unit 12 for a predetermined excitation time.
Note that the predetermined vibration time is a relatively short time of 10 seconds or less, for example, 3 seconds.
At this time, the oscillator 12 outputs a drive signal for vibrating the vibrator main body 11a at the ultrasonic frequency acquired from the controller 26 to the vibrator 11 for a predetermined excitation time.

Further, the control unit 26 temporarily stores the vibration start time, which is the time when the vibration of the concrete structure 1 is started, and the vibration end time, which is the time when the vibration of the concrete structure 1 is finished.
Then, the vibrator 11 amplifies the ultrasonic waves generated by the vibrator body 11a with the horn 11b, and applies the amplified ultrasonic waves to the surface of the concrete structure 1 to continuously vibrate the surface of the concrete structure 1. Ultrasonic vibrations are applied inside the structure 1.

In this way, the ultrasonic vibrations input into the inside of the concrete structure 1 act on the deformed part 2 inside the concrete structure 1, causing a temperature change in the deformed part 2.
For example, when the deformed portion 2 is a crack 2a, the fractured surfaces of the crack 2a rub against each other due to ultrasonic vibration, thereby generating frictional heat in the crack 2a. Alternatively, if the deformed portion 2 is a gap 2b in which moisture 2c has accumulated, cavitation occurs in the moisture 2c due to ultrasonic vibration, and the moisture 2c in the gap 2b generates heat.

When the vibration of the concrete structure 1 is started, the control unit 26 determines whether a predetermined vibration time has elapsed (step S105).
If the predetermined excitation time has not elapsed (step S105: No), the control unit 26 determines that the excitation of the concrete structure 1 has not ended, and continues processing until the predetermined excitation time has elapsed. wait.

On the other hand, if the predetermined vibration time has elapsed (step S105: Yes), the control unit 26 stops the temperature measurement of the concrete structure 1 started in step S103 because the vibration of the concrete structure 1 has ended. After stopping, a thermography image (see FIG. 5(b)), which is a still image showing the temperature distribution of the concrete structure 1 at the end time of the vibration, is generated from the moving image and temporarily stored.

Furthermore, the control unit 26 associates the ultrasonic frequency temporarily stored in step S104 with the temporarily stored thermographic image and stores it in the memory unit 25 as temperature information 25a (step S106).

After that, the control unit 26 determines whether or not the vibration has been completed under all the vibration conditions set in step S101 (step S107).
If the vibration under all vibration conditions is not completed (step S107: No), the control unit 26 reads the next ultrasonic frequency from the storage unit 25 and temporarily stores it as a new ultrasonic frequency (step S107: No). S108).

After that, the control unit 26 waits for a predetermined waiting time (step S109), then advances the process to step S103, and continues the process from step S103 to step S106 until the vibration is completed under all vibration conditions. repeat.

Note that in step S104, the control unit 26 outputs a control signal associated with the ultrasonic frequency temporarily stored in step S108 to the oscillation unit 12 for a predetermined excitation time, thereby causing the change in the ultrasonic frequency. Vibration of the concrete structure 1 is started.

In other words, by vibrating the concrete structure 1 with a different ultrasonic frequency, the non-destructive testing device 10 applies ultrasonic vibrations with different frequencies to the deformed portion 2 of the concrete structure 1. , making it easy for temperature changes to occur in the deformed portion 2.

When the vibration under all the vibration conditions is completed (step S107: Yes), the ultrasonic frequency at which temperature changes are likely to occur differs depending on the deformed portion 2, so the control unit 26 changes the frequency based on the plurality of temperature information 25a. The presence or absence of the shaped part 2 is determined for each ultrasonic frequency (step S110).

For example, the control unit 26 first extracts the lowest surface temperature at the excitation end time from the temperature information 25a, and sets a threshold based on the lowest surface temperature.
Note that the threshold value may be the same value as the lowest surface temperature, or a value obtained by adding a predetermined tolerance to the lowest surface temperature.

Thereafter, the control unit 26 detects a region that is hotter than the surrounding area, that is, a local heat generation region, by comparing the surface temperature indicated by the temperature information 25a with the above-mentioned threshold value.
More specifically, the control unit 26 determines that local heat generation is not occurring when there is no part where the surface temperature is higher than the threshold value, and determines that local heat generation is not occurring when there is a part where the surface temperature is higher than the threshold value. It is determined that this has occurred.
Further, if it is determined that local heat generation is occurring, the control unit 26 sets the heat generation site to the deformed portion 2 and acquires the position coordinates indicating the position of the deformed portion 2 in the temperature information 25a.

As described above, since the ultrasonic frequency at which temperature changes are likely to occur differs depending on the deformed portion 2, when the presence or absence of the deformed portion 2 is determined for each ultrasonic frequency in step S110, the control unit 26 , the determination result of step S110 is superimposed on the thermography image (see FIG. 5(b)) visualizing the temperature information 25a and displayed on the display section 22 (step S111), and the analysis process is ended.
At this time, the control unit 26 displays thermography images in a switchable manner for each ultrasonic frequency, or displays a list of all thermography images.

For example, if local heat generation is not occurring, the control unit 26 displays on the display unit 22 a message indicating that the deformed portion 2 has not been detected, superimposed on the thermography image. On the other hand, if local heat generation is occurring, the control unit 26 superimposes a message indicating that the deformed portion 2 has been detected and a mark indicating the position of the deformed portion 2 on the thermography image, and displays the message on the display unit 26. to be displayed.

In this way, the non-destructive testing apparatus 10 of the first embodiment determines each of the plurality of temperature information 25a obtained by exciting the concrete structure 1 at different ultrasonic frequencies in step S110, thereby detecting a single ultrasonic wave. It is possible to detect the deformed portion 2 which is difficult to detect by vibration using a sound wave frequency.

Next, an example of the results of non-destructive testing of the concrete structure 1 using the non-destructive testing device 10 described above will be described with reference to FIGS. 5 and 6.
Note that FIG. 5 is an explanatory diagram for comparing and explaining the external appearance and internal state of the concrete structure 1, and FIG. (b) shows a thermography image 5 in which temperature information 25a is visualized.
Further, FIG. 6 shows a thermographic image 6 of the deformed portion 2 containing moisture.

First, in the concrete structure 1 in which concrete is cast around the circumferential surface of the reinforcing bars 3, an appearance image 4 that captures the appearance of the surface of the concrete structure 1, as shown in FIG. No deformed portion 2 can be confirmed on the surface of the concrete structure 1.

The thermography image 5 obtained by non-destructively inspecting such a concrete structure 1 using the above-mentioned non-destructive inspection device 10 shows that the temperature is higher than the surrounding area, as shown in FIG. 5(b). The white portion 5a shown is visualized as extending from the reinforcing bar 3 in a streak-like manner.

In particular, on the left side of the thermography image 5, a lump of white portion 5b indicating a higher temperature than the striped portion is also visualized. Therefore, it can be confirmed that the deformed portion 2 clearly exists inside the concrete structure 1.

In addition, in a thermographic image 6 obtained by soaking moisture in the deformed parts 2 by submerging the concrete structure 1 in water, for example, in a concrete structure 1 in which the existence of three deformed parts 2 has been confirmed, As shown in 6, all three white parts 6a indicating high temperature are visualized.

This is because the water accumulated in the deformed portion 2 was visualized as a white portion 6a indicating a high temperature due to heat generated by the ultrasonic vibrations applied to the concrete structure 1.

In this way, the non-destructive testing device 10 of the first embodiment performs non-destructive testing by changing the ultrasonic frequency that excites the concrete structure 1, for example, to detect gaps 2b as shown in FIG. 2(b). This also makes it possible to detect deformed parts 2.

As described above, the non-destructive testing device 10 of Example 1 and the non-destructive testing method using the same non-destructively test the concrete structure 1 to detect the deformed portion 2.
This nondestructive testing device 10 includes a vibrator 11 that vibrates the surface of the concrete structure 1 at an ultrasonic frequency for a predetermined vibration time, and measures the temperature of the concrete structure 1 to obtain temperature information 25a. temperature measurement means (infrared camera 13 and analysis terminal 20).

Furthermore, the non-destructive inspection apparatus 10 includes a control unit 26 that causes the concrete structure 1 to be vibrated by the vibrator 11 with a changed ultrasonic frequency after being vibrated by the vibrator 11, and temperature information acquired by the temperature measuring means. 25a and output means (display section 22 and control section 26) for outputting a thermography image based on 25a and a determination result indicating the presence or absence of the deformed portion 2.

In addition, the non-destructive testing method includes a vibration step in which the surface of the concrete structure 1 is vibrated at an ultrasonic frequency for a predetermined vibration time by a vibrator 11, and a temperature measuring means to measure the temperature of the concrete structure 1. (The infrared camera 13 and the analysis terminal 20) measure the temperature and acquire it as temperature information 25a.

Furthermore, the non-destructive testing method includes a repeating process in which the controller 26 executes the vibration of the concrete structure 1 by the vibrator 11 with the ultrasonic frequency changed after the vibrator 11 vibrates, and the temperature measuring means acquires the vibration. An output step is performed in which the output means (display section 22 and control section 26) outputs a thermographic image based on the temperature information 25a and a determination result indicating the presence or absence of the deformed portion 2.

According to this configuration, the deformed portion 2 of the concrete structure 1 can be detected with high accuracy based on the temperature change occurring in the deformed portion 2 of the concrete structure 1.
Specifically, when the surface of the concrete structure 1 is vibrated by the vibrator 11 at an ultrasonic frequency, the ultrasonic vibration propagated inside the concrete structure 1 causes deformation occurring inside the concrete structure 1. A temperature change can be caused in the portion 2.

For example, when the deformed portion 2 is a crack 2a, ultrasonic vibration can cause the fractured surfaces of the crack 2a to rub against each other to generate frictional heat. Alternatively, if the deformed portion 2 is a gap 2b in which moisture 2c has accumulated, ultrasonic vibration can cause cavitation in the moisture 2c in the gap 2b to generate heat.

At this time, the non-destructive testing device 10 needs to vibrate the surface of the concrete structure 1 at an ultrasonic frequency suitable for causing the deformed portion 2 to generate heat.
Therefore, by including a control unit 26 that causes the concrete structure 1 to be vibrated by the vibrator 11 with a changed ultrasonic frequency after being vibrated by the vibrator 11, the non-destructive testing device 10 can Sonic vibrations can further be applied inside the concrete structure 1.

This allows the non-destructive inspection device 10 to reliably apply ultrasonic vibrations suitable for causing a temperature change to the deformed portion 2 of the concrete structure 1. Therefore, the non-destructive inspection device 10 can reliably cause a temperature change in the deformed portion 2 even if the state of the deformed portion 2 is a crack 2a or a void 2b containing moisture 2c.

Then, the non-destructive inspection device 10 detects the deformed portion 2 of the concrete structure 1 by measuring the local temperature change of the concrete structure 1 using the temperature measurement means (infrared camera 13 and analysis terminal 20). be able to.

Therefore, the non-destructive testing device 10 and the non-destructive testing method using the same are more susceptible to noise than, for example, detecting the deformed portion 2 based on reflected waves reflected inside the concrete structure 1. Therefore, the deformed portion 2 of the concrete structure 1 can be detected with high accuracy.

In addition, since it is equipped with an output means (display section 22 and control section 26) that outputs a thermographic image based on the temperature information 25a acquired by the temperature measurement means and a determination result indicating the presence or absence of the deformed part 2, it is non-destructive. The inspection device 10 can display the local temperature change caused by the vibration on the display means.

Therefore, the non-destructive testing device 10 makes it easier for a worker to determine the presence or absence of the deformed portion 2, compared to, for example, a case where the worker determines the presence or absence of the deformed portion 2 by reading an output waveform based on reflected waves. It can be easily done.

Furthermore, since the operation reception unit 21 that receives an input operation of an ultrasonic frequency is provided, the nondestructive inspection apparatus 10 can vibrate the surface of the concrete structure 1 with an arbitrary ultrasonic frequency.

Thereby, the non-destructive testing device 10 can reliably apply ultrasonic vibration suitable for causing a temperature change to the deformed portion 2 of the concrete structure 1. Therefore, the non-destructive testing device 10 can detect the deformed portion 2 of the concrete structure 1 with higher accuracy.

In addition, since the temperature measurement means (infrared camera 13 and analysis terminal 20) is configured with a thermography device that acquires the temperature distribution on the surface of the concrete structure 1 as temperature information 25a, the non-destructive inspection device 10 can It is possible to measure local temperature changes in the concrete structure 1 more efficiently and accurately than when measuring with a radiation thermometer.

In addition, in order for the control unit 26 to cause the concrete structure 1 to be vibrated by the vibrator 11 whose ultrasonic frequency has been changed after a predetermined waiting time has elapsed, the non-destructive testing apparatus 10 The temperature of the concrete structure 1, which has increased in temperature due to the vibration, can be lowered. Therefore, the non-destructive testing apparatus 10 can prevent the concrete structure 1 in a heated state from being vibrated at the changed ultrasonic frequency.

Thereby, the nondestructive testing device 10 can measure local temperature changes in the concrete structure 1 with higher accuracy than when no standby time is provided.
Therefore, the non-destructive testing device 10 can detect the deformed portion 2 of the concrete structure 1 with higher accuracy.

In addition, since it is equipped with a determination means (control unit 26) that determines the presence or absence of the deformed portion 2 of the concrete structure 1 based on the temperature information 25a, the nondestructive inspection apparatus 10 performs the work based on, for example, a thermography image. Compared to the case where the presence or absence of the deformed portion 2 is determined by a person, the presence or absence of the deformed portion 2 can be efficiently determined with less variation in determination.

Embodiment 2 will be described with reference to FIGS. 7 and 8 regarding a non-destructive testing apparatus 30 having a different configuration from Embodiment 1 described above.
Note that FIG. 7 shows a configuration diagram of the non-destructive testing device 30 in the second embodiment, and FIG. 8 shows a block diagram of the non-destructive testing device 30 in the second embodiment.

Further, the same configurations as those in the first embodiment are given the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 7 and 8, the nondestructive testing device 30 of the second embodiment includes a vibrator 11 that vibrates the surface of the concrete structure 1, an ultrasonic oscillator 40 that controls the operation of the vibrator 11, It includes an infrared camera 13 and an analysis terminal 20 to which the infrared camera 13 is connected.

To be more specific, as shown in FIGS. 7 and 8, the ultrasonic oscillator 40 of the non-destructive testing device 30 includes an operation reception section 41 that receives input operations from an operator, a display section 42 that displays various information, and a vibration It includes a vibrator connection section 43 to which the child 11 is connected, a storage section 44 that stores various information, and a vibration control section 45 that controls these operations.

The operation reception unit 41 of the ultrasonic oscillator 40 is configured with, for example, a keyboard, and has a function of accepting input operations by a worker and a function of outputting information indicating the received input contents to the vibration control unit 45. There is.
Further, the display unit 42 of the ultrasonic oscillator 40 is configured with, for example, a liquid crystal display, and has a function of displaying various information based on control signals from the vibration control unit 45.

Further, the transducer connecting section 43 of the ultrasonic oscillator 40 is configured with an input/output terminal such as a USB, and has a function of connecting to the transducer 11 and a function of exchanging various information with the transducer 11. have.

Furthermore, the storage unit 44 of the ultrasonic oscillator 40 is composed of a hard disk or a nonvolatile memory, and has a function of writing and storing various information and a function of reading various information.

Further, the vibration control unit 45 of the ultrasonic oscillator 40 is composed of hardware such as a CPU and memory, and software such as a control program.
This excitation control unit 45 has a processing function related to sending and receiving various signals to and from the vibrator 11, a processing function related to sending and receiving various signals to and from the operation reception unit 41, display unit 42, and storage unit 44, and a processing function related to sending and receiving various signals to and from the transducer 11, It has the function of controlling the operation of each part connected through the.

Furthermore, the analysis terminal 20 differs from the analysis terminal 20 of the first embodiment in that it does not include the vibrator connection section 23.
Specifically, as shown in FIG. 8, the analysis terminal 20 of the non-destructive testing device 30 has an operation reception unit 21 that receives operations from a worker, a display unit 22 that displays various information, and an infrared camera 13 connected to each other. The camera connection unit 24 includes a camera connection unit 24 that stores various information, a storage unit 25 that stores various information, and a control unit 26 that controls these operations.

Next, processing operations when non-destructively inspecting the concrete structure 1 using the non-destructive inspection apparatus 30 of the second embodiment will be described with reference to FIGS. 9 to 12.
Further, FIG. 9 shows a flowchart of the work procedure performed by the worker, FIG. 10 shows a flowchart of the analysis process in the analysis terminal 20, FIG. 11 shows a flowchart of the excitation process in the ultrasonic oscillator 40, and FIG. An explanatory diagram illustrating the process of calculating the amount of change is shown.

First, as shown in FIG. 9, the worker places the vibrator 11 and the infrared camera 13 at desired positions (step S201).
Thereafter, the worker operates the analysis terminal 20 to start the analysis process, and also inputs settings for temperature measurement conditions and performs temperature measurement start operations according to instructions on the setting screen displayed on the display unit 22 of the analysis terminal 20. (Step S202).
At this time, the worker selects and inputs the ultrasonic frequency as the temperature measurement condition, and then presses the temperature measurement start button displayed on the display unit 22.

On the other hand, in step S202 of FIG. 9, the control unit 26 of the analysis terminal 20 that starts the analysis process by the operator's operation displays a setting screen (not shown) prompting the input of temperature measurement conditions, as shown in FIG. 22 to accept input operations from the worker (step S211).

Although detailed illustrations are omitted, the setting screen includes an input field for selecting and inputting the ultrasonic frequency, a temperature measurement start button to start temperature measurement of the concrete structure 1, a temperature measurement stop button to stop temperature measurement, An analysis start button for starting analysis based on the temperature information 25a, etc. are displayed.

The control unit 26 that has displayed the setting screen on the display unit 22 determines whether the worker who selected and inputted the ultrasonic frequency in step S202 of FIG. 9 has pressed the temperature measurement start button (step S212).
If the temperature measurement start button is not pressed (step S212: No), the control unit 26 waits for processing until the temperature measurement start button is pressed.

On the other hand, when the temperature measurement start button is pressed (step S212: Yes), the control unit 26 starts measuring the temperature of the concrete structure 1 after storing the ultrasonic frequency input in step S211 in the storage unit 25. (Step S213).
At this time, the control unit 26 sequentially temporarily stores the moving images from the infrared camera 13 as data showing the temperature change of the concrete structure 1 in time series.

Then, as shown in FIG. 10, the control unit 26 determines whether the temperature measurement stop button is pressed by the worker (step S214), and until the temperature measurement stop button is pressed (step S214: No). , acquire a moving image from the infrared camera 13.

Returning to step S202 in FIG. 9, the worker who has completed the temperature measurement start operation operates the ultrasonic oscillator 40 to start the excitation process, and also changes the setting screen displayed on the display unit 42 of the ultrasonic oscillator 40. According to the instructions, setting input of vibration conditions and vibration start operation are performed (step S203).
At this time, the worker inputs the ultrasonic frequency set and input into the analysis terminal 20 as an excitation condition, and then presses the excitation start button displayed on the display unit 42.

On the other hand, in step S203 of FIG. 9, the vibration control unit 45 of the ultrasonic oscillator 40, which has started the vibration process by the operator's operation, displays a setting screen (not shown) that prompts input of vibration conditions, as shown in FIG. (omitted) is displayed on the display unit 42, and an input operation from the worker is accepted (step S231).
Although detailed illustrations are omitted, the setting screen displays an input field for setting and inputting the ultrasonic frequency, a vibration start button for starting vibration of the transducer 11, and the like.

The vibration control unit 45 that has displayed the setting screen on the display unit 42 determines whether the worker who inputted the ultrasonic frequency in step S203 of FIG. 9 has pressed the vibration start button (step S232).
If the vibration start button is not pressed (step S232: No), the vibration control unit 45 waits for processing until the vibration start button is pressed.

On the other hand, when the vibration start button is pressed (step S232: Yes), the vibration control unit 45 transmits the drive signal for vibrating the transducer main body 11a at the ultrasonic frequency input in step S231 to a predetermined vibration level. The time is outputted to the vibrator 11, and the vibration of the concrete structure 1 is started (step S233).

When the vibration of the concrete structure 1 is started, the vibration control unit 45 determines whether a predetermined vibration time has elapsed (step S234).
If the predetermined excitation time has not elapsed (step S234: No), the excitation control unit 45 determines that the excitation of the concrete structure 1 has not ended, and the predetermined excitation time has elapsed. Wait until processing.

On the other hand, if the predetermined vibration time has elapsed (step S234: Yes), the vibration control unit 45 returns the process to step S231 because the vibration of the concrete structure 1 has been completed, and also returns the process to step S231. Waits until there is an input operation.

Returning to step S203 in FIG. 9, the worker who has completed the vibration start operation determines the temperature of the concrete structure 1 according to the guidance displayed on the display unit 22 of the analysis terminal 20 after the vibration of the concrete structure 1 is finished. An operation to stop the measurement is performed (step S204).
Specifically, the worker stops temperature measurement of the concrete structure 1 by pressing a temperature measurement stop button displayed on the display unit 22.

At this time, as shown in FIG. 10, when the control unit 26 of the analysis terminal 20 detects that the temperature measurement stop button is pressed (step S214: Yes), the control unit 26 of the analysis terminal 20 transfers the ultrasound frequency input in step S211 to the temporarily stored video. It is stored in the storage unit 25 as temperature information 25a in association with the image (step S215).

After that, the control unit 26 determines whether either the condition change button for changing the ultrasonic frequency and repeating the vibration of the concrete structure 1 or the analysis start button for starting the analysis of the temperature information 25a has been pressed. (Step S216).

At this time, as shown in FIG. 9, the worker performs an operation to change the ultrasonic frequency or start analysis of the temperature information 25a according to the guidance displayed on the display unit 22 of the analysis terminal 20 ( Step S205).

Specifically, when changing the ultrasonic frequency, the worker presses the condition change button displayed on the display unit 22 of the analysis terminal 20, and when starting analysis of the temperature information 25a, the operator presses the condition change button displayed on the display unit 22. Press the analysis start button.

Specifically, in step S216 of FIG. 10, if the condition change button is pressed (step S216: No), the control unit 26 of the analysis terminal 20 returns the process to step S211, and sets new temperature measurement conditions. Waits for processing until input.

At this time, when the worker performs the operations from step S202 to step S204 in FIG. The vibration control unit 45 executes the processes from step S232 to step S234 described above.
Thereby, the non-destructive testing device 30 vibrates the concrete structure 1 at the changed ultrasonic frequency and acquires the temperature information 25a at the changed ultrasonic frequency.

On the other hand, in step S216 of FIG. 10, when the analysis start button is pressed (step S216: Yes), the control unit 26 of the analysis terminal 20 controls the The amount of temperature change in the concrete structure 1 is calculated for each ultrasonic frequency (step S217).

At this time, the control unit 26 detects a location on the surface of the concrete structure 1 that is hotter than the surrounding area, that is, a local heat generation location, and calculates the amount of temperature change in the heat generation location.
More specifically, as shown in FIG. 12, the control unit 26 calculates the temperature difference between the lowest temperature and the highest temperature as the amount of temperature change between the vibration start time T1 and the vibration end time T2. do.

After calculating the amount of temperature change, the control unit 26 determines the ultrasonic frequency with the largest amount of temperature change among the amount of temperature change for each ultrasonic frequency as the determination frequency for determining the presence or absence of the deformed portion 2 (step S218).

For example, when vibration is performed under No. 1 vibration condition, No. 2 vibration condition, and No. 3 vibration condition with different ultrasonic frequencies, the control unit 26 controls the vibration from the vibration start time T1 to the vibration end time, as shown in FIG. The ultrasonic frequency of "No. 1 excitation condition" with the largest temperature difference in 3 seconds during T2 is determined as the determination frequency.

Thereafter, as shown in FIG. 10, the control unit 26 determines the presence or absence of the deformed portion 2 based on the temperature information 25a of the determination frequency (step S219).
For example, when the temperature difference calculated from the temperature information 25a of the determination frequency is less than the threshold value indicating the lower limit of the temperature difference, the control unit 26 determines that the deformed portion 2 does not exist inside the concrete structure 1.

On the other hand, if the temperature difference calculated from the temperature information 25a of the determination frequency is greater than or equal to the threshold value indicating the lower limit of the temperature difference, the control unit 26 determines that the deformed part 2 exists inside the concrete structure 1. At the same time, the position coordinates indicating the position of the deformed portion 2 in the temperature information 25a are acquired.

After determining the presence or absence of the deformed portion 2, the control unit 26 superimposes the determination result of step S219 on the thermography image (see FIG. 5(b)) that visualizes the temperature information 25a of the determination frequency, as shown in FIG. The information is also displayed on the display unit 22 (step S220), and the analysis process ends.

For example, if the deformed part 2 does not exist, the control unit 26 displays on the display unit 22 a message indicating that the deformed part 2 has not been detected, superimposed on the thermography image. On the other hand, if the deformed part 2 is present, the control unit 26 superimposes a message indicating that the deformed part 2 has been detected and a mark indicating the position of the deformed part 2 on the thermography image, and displays it on the display unit 22. to be displayed.

As described above, the non-destructive testing device 30 of the second embodiment includes a vibrator 11 that vibrates the surface of the concrete structure 1 at an ultrasonic frequency for a predetermined vibration time, and a vibrator 11 that vibrates the surface of the concrete structure 1 at an ultrasonic frequency. It is equipped with temperature measurement means (infrared camera 13 and analysis terminal 20) that measures and acquires temperature information 25a.

Furthermore, the non-destructive testing device 30 includes an excitation control unit 45 of an ultrasonic oscillator 40 that causes the concrete structure 1 to be vibrated by the vibrator 11 with a changed ultrasonic frequency after being vibrated by the vibrator 11; It is equipped with an output means (display section 22 and control section 26 of the analysis terminal 20) that outputs a thermographic image based on the temperature information 25a acquired by the heating means and a determination result indicating the presence or absence of the deformed part 2.

In addition, the nondestructive testing method of Example 2 includes a vibration step in which the surface of the concrete structure 1 is vibrated at an ultrasonic frequency for a predetermined vibration time by the vibrator 11, and a temperature of the concrete structure 1. A temperature measurement step is performed in which temperature measurement means (infrared camera 13 and analysis terminal 20) measure and obtain temperature information 25a.

Furthermore, the non-destructive testing method includes a repetitive process in which, after the vibration is applied by the vibrator 11, the vibration control unit 45 of the ultrasonic oscillator 40 executes the vibration of the concrete structure 1 by the vibrator 11 with the ultrasonic frequency changed. , an output step in which the output means (display section 22 and control section 26 of the analysis terminal 20) outputs a thermography image based on the temperature information 25a acquired by the temperature measurement means and a determination result indicating the presence or absence of the deformed part 2. .

According to this configuration, the non-destructive testing device 30 and the non-destructive testing method using the same accurately detect the deformed portion 2 of the concrete structure 1 by the temperature change occurring in the deformed portion 2 of the concrete structure 1. can be detected.

Furthermore, the non-destructive testing apparatus 10 is equipped with a calculation means (control unit 26 of the analysis terminal 20) that calculates the amount of temperature change for each ultrasonic frequency based on the temperature information 25a acquired by the temperature measurement means.

Furthermore, the non-destructive testing apparatus 10 includes a frequency determining means (an analysis terminal 20 control units 26) are provided.
The output means is configured to output a thermography image based on the temperature information 25a at the determination frequency and a determination result indicating the presence or absence of the deformed portion 2.

According to this configuration, even when the surface of the concrete structure 1 is vibrated by changing the ultrasonic frequency, the deformed portion 2 of the concrete structure 1 can be detected accurately and efficiently. .

Specifically, the temperature change in the deformed portion 2 becomes largest when optimal ultrasonic vibration acts on the deformed portion 2. Therefore, by calculating the amount of temperature change for each ultrasonic frequency based on the temperature information 25a acquired by the temperature measuring means, the non-destructive inspection apparatus 10 can calculate the temperature information 25a that causes the largest temperature change in the deformed part 2. Identification can be made easier.

Then, the ultrasonic frequency with the largest amount of temperature change is set as the determination frequency used for determining the deformed portion 2, and a thermography image based on the temperature information 25a at the determination frequency and the determination result indicating the presence or absence of the deformed portion 2 are output. By doing so, the non-destructive testing device 10 can make it easier for an operator to determine the presence or absence of the deformed portion 2, for example.

Therefore, the nondestructive testing device 10 accurately and efficiently detects the deformed portion 2 of the concrete structure 1 even when the ultrasonic frequency is changed to vibrate the surface of the concrete structure 1. be able to.

Further, since the calculation means (control unit 26) calculates the temperature difference generated during the excitation time as the amount of temperature change, the nondestructive testing apparatus 10 can easily calculate the amount of temperature change. Therefore, the non-destructive testing device 10 can efficiently detect the deformed portion 2.

In addition, since the ultrasonic oscillator 40 is equipped with an operation reception unit 41 that receives input operations for ultrasonic frequencies, the non-destructive testing device 30 can vibrate the surface of the concrete structure 1 at any ultrasonic frequency.

Thereby, the non-destructive testing device 30 can reliably apply ultrasonic vibration suitable for causing a temperature change to the deformed portion 2 of the concrete structure 1. Therefore, the non-destructive testing device 30 can detect the deformed portion 2 of the concrete structure 1 with higher accuracy.

Furthermore, since the non-destructive inspection apparatus 10 includes a determination means (control unit 26) that determines the presence or absence of the deformed portion 2 of the concrete structure 1 based on the temperature information 25a at the determination frequency, the non-destructive inspection apparatus 10 Compared to the case where the presence or absence of the deformed part 2 is determined based on the visualized temperature information 25a, the presence or absence of the deformed part 2 can be efficiently determined with less variation in determination.
Furthermore, since the determination is made based on the temperature information 25a at the determination frequency, that is, the temperature information 25a with clear temperature changes, the nondestructive testing apparatus 10 can accurately determine the presence or absence of the deformed portion 2.

Furthermore, since the control unit 26 of the analysis terminal 20 specifies the position of the deformed portion 2 of the concrete structure 1 based on the temperature information 25a at the determination frequency, for example, a worker can identify the deformed portion 2 based on the thermography image. Compared to the case where the position of the deformed portion 2 is specified, the burden on the worker can be reduced and the position of the deformed part 2 can be specified efficiently.

In the correspondence between the configuration of this invention and the above-described embodiments,
The temperature measurement means and thermography device of the present invention correspond to the infrared camera 13 and analysis terminal 20 of the embodiment,
Similarly below,
The repetition means corresponds to the control section 26 and the vibration control section 45,
The output information corresponds to the thermography image and the determination result indicating the presence or absence of the deformed part 2,
The output means corresponds to the display section 22 and the control section 26,
The calculation means, the frequency determination means, and the determination means correspond to the control section 26,
The operation reception means corresponds to the operation reception unit 21 and the operation reception unit 41,
The vibration step corresponds to step S104 and step S233,
The temperature measurement process corresponds to step S103 and step S106, as well as step S213 and step S215,
The repetitive process corresponds to step S107: Yes and step S108, and step S216: No and steps S231 to S234,
The output process corresponds to step S113 and step S219, but
This invention is not limited to the configuration of the above-described embodiments, and can be implemented in many other embodiments.

Specifically, in the embodiment described above, the concrete structure 1 is a test piece having a size specified by the Japanese Industrial Standards, but it is not limited to this, and even concrete structures such as buildings and bridges can be used. good.
Further, although the thermography image was created based on the moving image acquired from the infrared camera 13, the present invention is not limited to this, and the thermography image may be created based on a plurality of still images.

Further, although a mark indicating the position of the deformed part 2 is superimposed on a thermography image visualizing the temperature information 25a and displayed on the display unit 22 of the analysis terminal 20, the present invention is not limited to this, and the mark indicating the position of the deformed part 2 is displayed. A thermographic image with overlapping marks may be printed on a paper medium, or temperature information and a thermographic image may be output to a storage medium or another terminal.
Further, the information outputted to the display unit 22 is not limited to a thermography image, and may be a still image such as a graph, a temperature change, character string data indicating the temperature, or the like.
In addition, although the infrared camera 13 is placed facing the surface of the concrete structure 1 so that the vibrator 11 is located at the center of the imaging range of the infrared camera 13, the present invention is not limited to this. The infrared camera 13 may be placed toward the surface of the concrete structure 1 so that the infrared camera 13 is located at the center of the imaging range of the infrared camera 13.

Further, although the non-destructive inspection apparatuses 10 and 30 are provided with one infrared camera 13, the present invention is not limited to this, and non-destructive inspection apparatuses may be provided with a plurality of infrared cameras 13.
At this time, for example, one of the two infrared cameras 13 is placed facing the top surface of the concrete structure 1 with which the vibrator 11 comes into contact, and the other infrared camera 13 is placed facing the top surface of the concrete structure 1. It may also be placed toward the side that intersects with.

Furthermore, in Examples 1 and 2, when the deformed portion 2 exists, the control unit 26 of the analysis terminal 20 acquires the position coordinates indicating the position of the deformed portion 2 in the temperature information 25a; however, this is not limited to this. Instead, more detailed positional coordinates of the deformed portion 2 may be obtained in collaboration with a plurality of infrared cameras 13, for example.

Specifically, in the non-destructive inspection device equipped with the two infrared cameras 13 described above, the control unit 26 of the analysis terminal 20 determines the temperature of the deformed portion 2 based on temperature information 25a obtained by capturing an image of the top surface of the concrete structure 1. By specifying the horizontal position and specifying the vertical position of the deformed part 2 based on the temperature information 25a obtained by imaging the side surface of the concrete structure 1, the position coordinates of the deformed part 2 can be specified in more detail. You may.

Further, in step S101 of the first embodiment, 20 kHz, 30 kHz, and 40 kHz are selected and input as the ultrasonic frequencies, but the selected ultrasonic frequencies are not limited to this and may be any appropriate frequency. Alternatively, a configuration may be adopted in which an appropriate ultrasonic frequency value is directly input instead of being input selectively by the operator.
Note that in Step S211 and Step S231 of the second embodiment, the ultrasonic frequency input by the worker may be similarly configured to selectively input or directly input an appropriate frequency.

Further, in step S110 of Example 1 and step S219 of Example 2, the control unit 26 determined the presence or absence of the deformed part 2, but the present invention is not limited to this, and the presence or absence of the deformed part 2 can be visually determined by the operator. You may. In this case, step S110 of Embodiment 1 and step S219 of Embodiment 2 are skipped, and only the thermography image in which the temperature information 25a is visualized is displayed on the display unit 22, so that the worker can judge whether there is a deformed part 2 or not. let

Further, although one thermography image that visualizes the temperature information 25a is displayed on the display unit 22, the present invention is not limited to this, and a plurality of thermography images may be displayed on the display unit 22 in a superimposed manner.
For example, as shown in FIG. 13A, which is an explanatory diagram illustrating another output form of temperature information 25a, a first thermography image 7a, a second thermography image 7b, and The third thermography image 7c may be displayed on the display section 22 in a superimposed manner.

In this case, the thermography image 7 displayed on the display unit 22 includes the deformed part 2 of the first thermography image 7a and the deformed part 2 of the second thermography image 7b, as shown in FIGS. The deformed portion 2 and the deformed portion 2 of the third thermography image 7c are displayed together.

As a result, the non-destructive testing apparatus 10 can display all the deformed parts 2 on the display section 22 at once even if there are a plurality of deformed parts 2 with different ultrasonic frequencies suitable for heat generation. Visual determination of the deformed portion 2 by a worker can be facilitated.

Further, in step S106 of the analysis process in Example 1 described above, the thermography image showing the temperature distribution of the concrete structure 1 at the end time of the excitation is stored as the temperature information 25a, but the present invention is not limited to this. For example, a thermographic image at the time when the highest temperature was obtained between the vibration start time and the vibration end time may be stored as the temperature information 25a.

Further, in step S110 of the analysis process in Example 1 described above, the deformed part 2 was detected by comparing the threshold value based on the lowest surface temperature and the surface temperature indicated by the temperature information 25a, but the present invention is not limited to this. .

For example, instead of step S110 of the first embodiment, the control unit 26 may perform the processes of steps S217 to S219 of the second embodiment to determine the presence or absence of the deformed portion 2.
In this case, instead of step S111 of the first embodiment, the control unit 26 performs the process of step S220 of the second embodiment, and superimposes the determination result of step S219 on the thermography image that visualizes the temperature information 25a of the determination frequency. is displayed on the display section 22.

In addition, in steps S217 to S219 of the analysis process in the second embodiment described above, the determination frequency is determined based on the amount of temperature change between the vibration start time T1 and the vibration end time T2, and the temperature information of the determination frequency is determined. 25a, the presence or absence of the deformed portion 2 has been determined, but the present invention is not limited thereto.

For example, instead of steps S217 to S219 described above, the control unit 26 performs the process of step S110 of the first embodiment based on the thermography image at the excitation end time to determine the presence or absence of the deformed portion 2. It's okay.
In this case, instead of step S220 of the second embodiment, the control unit 26 performs the process of step S111 of the first embodiment, superimposes the determination result of step S110 on the thermography image that visualizes the temperature information 25a, and displays it on the display screen. 22.

In addition, in the second embodiment described above, when calculating the amount of temperature change in the concrete structure 1 due to vibration for each ultrasonic frequency (step S217), from the vibration start time T1 to the vibration end time T2, Although the temperature difference between the lowest temperature and the highest temperature was calculated as the amount of temperature change, the present invention is not limited to this.

For example, the control unit 26 of the analysis terminal 20 may calculate the rate of temperature change with respect to the excitation time in the heat generating part as the amount of temperature change.
According to this, the non-destructive testing apparatus 30 can determine the determination frequency based on the rate of temperature change, even if the temperature difference caused by the excitation time is the same, for example. Therefore, the non-destructive testing device 30 can detect the deformed portion 2 of the concrete structure 1 with higher accuracy.

Alternatively, the control unit 26 of the analysis terminal 20 calculates the temperature gradient (temperature difference or temperature change rate) between the area with the lowest surface temperature and the heat generating area on the surface of the concrete structure 1 as the amount of temperature change. Good too.
Even in this case, the non-destructive testing device 10 and the non-destructive testing method can produce the same effects as the embodiments described above.

1... Concrete structure 2... Deformed parts 10, 30... Non-destructive inspection device 11... Vibrator 13... Infrared camera 20... Analysis terminal 21... Operation receiving section 22... Display section 25a... Temperature information 26... Control section 41... Operation Reception unit 45...excitation control unit

Claims (10)

A non-destructive inspection device that non-destructively inspects a concrete structure to detect deformed parts,
a vibrator that excites the surface of the concrete structure at an ultrasonic frequency for a predetermined excitation time;
temperature measuring means for measuring the temperature of the concrete structure and acquiring it as temperature information;
repeating means for causing the concrete structure to be vibrated by the vibrator with the ultrasonic frequency changed after being vibrated by the vibrator;
A non-destructive inspection device comprising: an output means for outputting output information based on the temperature information acquired by the temperature measurement means. Calculating means for calculating the amount of temperature change for each of the ultrasonic frequencies based on the temperature information acquired by the temperature measuring means;
a frequency determining means for determining the ultrasonic frequency at which the temperature change amount is the largest among the temperature change amounts obtained by the calculation means as a determination frequency to be used for determining the deformed portion;
The output means is
The non-destructive testing apparatus according to claim 1, wherein the non-destructive testing apparatus is configured to output the output information based on the temperature information at the determination frequency. 3. The non-destructive inspection apparatus according to claim 2, wherein the calculation means is configured to calculate a temperature difference generated during the excitation time as the temperature change amount. 3. The non-destructive inspection apparatus according to claim 2, wherein the calculation means is configured to calculate a temperature change rate with respect to the vibration time as the temperature change amount. 2. The non-destructive testing apparatus according to claim 1, further comprising operation receiving means for receiving an input operation of said ultrasonic frequency. The temperature measuring means,
The non-destructive testing device according to claim 1, comprising a thermography device that acquires temperature distribution on the surface of the concrete structure as the temperature information. The repeating means
2. The non-destructive testing apparatus according to claim 1, wherein after a predetermined standby time has elapsed, the concrete structure is vibrated by the vibrator with the ultrasonic frequency changed. 3. The non-destructive testing apparatus according to claim 2, further comprising determining means for determining the presence or absence of the deformed portion of the concrete structure based on the temperature information at the determination frequency. The determining means is
The non-destructive testing device according to claim 8, wherein the position of the deformed portion of the concrete structure is specified based on the temperature information at the determination frequency. A non-destructive inspection method for non-destructively inspecting a concrete structure to detect deformed parts,
an excitation step in which a vibrator excites the surface of the concrete structure at an ultrasonic frequency for a predetermined excitation time;
a temperature measurement step in which a temperature measurement means measures the temperature of the concrete structure and acquires it as temperature information;
After the vibration by the vibrator, a repetition step of causing vibration of the concrete structure by the vibrator with the ultrasonic frequency changed by a repetition means;
A non-destructive inspection method comprising: an output step in which an output means outputs output information based on the temperature information acquired by the temperature measurement means.

Images