KR100454361B1 - Portable ultrasonic device for estimating the crack depth of concrete construnction - Google Patents

Abstract

The present invention relates to a simple ultrasonic device for measuring the concrete crack depth that can be easily measured the depth of the concrete crack by a simple operation, which is in close contact with the surface of the concrete structure in the ultrasonic device for measuring the crack depth of the concrete structure The first oscillator is excited by a predetermined pulse signal from the internal measuring circuit and generates the first ultrasonic signal, and the first oscillator receiving the ultrasonic signal transmitted through the concrete surface to generate the first high frequency voltage A measuring body main body having symmetrically inserted first and second sliding grooves symmetrically inserted at left and right sides with a predetermined distance from the center, and having openings formed downwardly at left and right ends thereof, and connected to the first sliding grooves; And horizontally moved by a predetermined distance, and one side of the measuring circuit A first oscillator which is excited by a predetermined pulse signal introduced from the second oscillator to generate a second ultrasonic signal, and is connected to the second sliding groove, and is horizontally moved by a predetermined distance, and on one side of the rear surface thereof, a concrete surface And a second expansion part in which a second oscillator is inserted to receive an ultrasonic signal transmitted through the second high frequency voltage, and the measuring body is provided from the first or second oscillator to the first or second oscillator. Characterized in that it is configured to calculate the depth of the concrete crack by measuring the first or second ultrasonic signal arrival time.

Description

Portable ultrasonic device for estimating the crack depth of concrete construnction

The present invention relates to an apparatus for measuring concrete cracks, and more particularly, to a simple ultrasonic apparatus for measuring concrete crack depth, which enables easy measurement of the depth of concrete cracks according to various measurement methods by a simple operation.

In general, the cracks generated in the concrete structure is one of the indicators indicating the deterioration of the load capacity and durability of the concrete structure, thereby quantitatively calculating the crack state (width, length, depth), thereby preventing the occurrence of large accidents. On the other hand, the width and length of concrete cracks can be easily measured by visual inspection, relatively simple equipment such as crack scales and crack microscopes, but the depth measurement of cracks is not easy to visually identify. Since this difficult and quantitative measurement is not carried out, the investigator cuts out the cracks and checks them by core boring, or uses the ultrasonic flaw detection method which is one of the non-destructive testing methods. This is commonly used.

Since the detailed description of the ultrasonic flaw detection method is obvious to those skilled in the art, the detailed description thereof will be omitted. In order to perform the ultrasonic flaw detection method, for example, expensive ultrasonic measurement equipment such as PUNDIT (Portable Ultrasonic Non-destructive Digital Indicating Tester) or TR-300 is required.

1 is for explaining a conventional ultrasonic device (fund) for measuring concrete cracks, which is configured with an oscillator (2), a receiver (3), cables (4, 5) and the measuring instrument body (6).

The oscillator 2 is excited to generate a predetermined level of ultrasonic waves (mechanical vibration) by a predetermined pulse signal flowing from the measuring instrument body, which will be described later, and the oscillator 3 is an ultrasonic wave delivered through the concrete structure 1. To generate a high frequency voltage (electric vibration) in proportion to the ultrasonic intensity.

The oscillator 2 and the oscillator 3 each have a vibrator (piezoelectric material), not shown, to perform a reversible conversion between electric vibration and mechanical vibration, respectively, and correspondingly disposed at a predetermined distance from the crack Cr. Ultrasonic waves are transmitted / received through the concrete structure 1.

The cables 4 and 5 are for electrically connecting the oscillator 2, the oscillator 3 and the measuring body 6, respectively, and the measuring body 6 is a predetermined size for measuring the concrete crack (Cr) depth. After applying the pulse signal to the oscillator (2), by analyzing the time until the oscillator (3) receiving the ultrasonic signal of the oscillator (2) to generate a high frequency voltage, the transmission time of the ultrasonic signal through the concrete structure (1) To calculate the depth of the concrete crack (Cr) based on this to display visually.

According to the above configuration, the investigator first smoothes the concrete surface to be measured for the crack depth (Cr) with sandpaper, grinder, etc., and then evenly distributes the grease or glycerin to the concrete surface, and the oscillator (2) and the receiver (3) and the concrete Facilitate adhesion of the surface.

The investigator then places the oscillator 2 and the oscillator 3 on the concrete surface equally spaced apart from the crack Cr, respectively, and then operates the measuring instrument body 6 to measure the pulse depth of the crack Cr. Is applied to the oscillator (2), and the oscillator (2) generates a predetermined ultrasonic signal according to the applied pulse signal and delivers it to the concrete surface.

The receiver 3 receives the ultrasonic signal transmitted through the concrete structure 1, converts the ultrasonic signal into a high frequency voltage, and then applies it to the measuring instrument body 6. After that, the measuring instrument main body 6 obtains an ultrasonic signal arrival time from the oscillator 2 to the oscillator 3, and calculates the concrete crack depth using the arrival time.

The ultrasonic apparatus for measuring concrete cracks described above is a direct method, an indirect method and a semi-direct method because the oscillator 2 and the oscillator 3 are connected to the main body 6 through the cables 4 and 5 that are easily moved. It is possible to measure the crack (Cr) under various conditions such as the method, and to obtain a very precise measurement value.

However, in the conventional apparatus, since the oscillator 2 and the oscillator 3 should be fixed and closely adhered to the concrete surface during measurement, an additional person is required for the operation of the measuring instrument body 6, and the oscillator 2 and Since the examinee 3 must be accurately positioned at a predetermined position on the concrete surface, it is difficult to measure if the examiner is not an experienced investigator.

In addition, the conventional apparatus is expensive equipment for the professional investigator, there is a problem that is difficult to equip realistically in a general apartment or residential complex management office.

Accordingly, the present invention has been made in view of the above circumstances, and provides a simple ultrasonic device for measuring the concrete crack depth, which is manufactured in a popular type, so that the general person can easily measure the depth of the concrete crack according to various measurement methods by simple operation. Egg has a purpose.

1 is a view for explaining the conventional ultrasonic device for measuring concrete cracks.

Figure 2 is a perspective view showing the appearance of the simplified ultrasonic device for measuring the concrete crack depth according to an embodiment of the present invention.

3 is a rear view of the back structure of the apparatus shown in FIG.

4 is a cross-sectional view of the main parts for explaining the connection structure between the first and second expansion portions 20 and 30 and the first and second sliding grooves 15 and 16 shown in FIG.

FIG. 5 is a view illustrating a state in which the first and second expansion parts 20 and 30 illustrated in FIG. 2 are inserted into the measuring instrument body 10.

6 is a cross-sectional view showing a cross-sectional configuration of a-a 'point shown in FIG.

FIG. 7 is a block diagram functionally showing the configuration of a measuring circuit mounted inside the measuring instrument body 10 shown in FIG.

8 is a view for explaining the operation of the simple ultrasonic device for measuring the concrete crack depth according to an embodiment of the present invention.

Figure 9 is a perspective view showing the appearance of the simplified ultrasonic device for measuring the concrete crack depth according to another embodiment of the present invention.

FIG. 10 is a rear view of the back structure of the device shown in FIG. 9; FIG.

*** Explanation of symbols for the main parts of the drawing ***

2: oscillator, 3: oscillator,

4, 5: cable, 6, 10, 40: main body

11, 42: first oscillator, 12, 43: first oscillator,

13, 44: display unit, 14, 45: key input unit,

15, 16: the first and second slide grooves, 17: the locking groove,

18, 19: metal plate, 20, 50: first extension portion,

21, 52: second oscillator, 31, 62: second oscillator,

23: square groove, 24: spring,

30, 60: second extension portion, 41: connector,

51, 61: connector connection portion, 71: pulse generator,

72: high frequency receiver, 73: memory,

74: program storage unit, 75: control unit

Cr: crack, J1, J2: handle.

Simple ultrasonic apparatus for measuring the concrete crack depth according to the present invention for achieving the above object is in the ultrasonic apparatus for measuring the crack depth of the concrete structure in close contact with the surface of the concrete structure, by a predetermined pulse signal flowing from the internal measuring circuit The first oscillator excited and generating the first ultrasonic signal and the first oscillator receiving the ultrasonic signal transmitted through the concrete surface and generating the first high frequency voltage are symmetrically left and right at a predetermined distance from the center of the back surface. First and second sliding grooves symmetrically formed with openings in left and right ends and symmetrically formed at left and right ends thereof, and connected to the first sliding grooves to be horizontally moved in a predetermined distance unit and at one side of the rear surface thereof. A second ultrasonic wave excited by a predetermined pulse signal flowing from the measuring circuit A second high frequency voltage connected to the first expansion part in which the second oscillator which generates a signal is inserted, horizontally moved by a predetermined distance and connected to the second sliding groove, and receiving an ultrasonic signal transmitted through a concrete surface on one side thereof; And a second expansion part inserted with a second oscillator for generating a second oscillator, wherein the measuring body measures the time of arrival of the first or second ultrasonic signal from the first or second oscillator to the first or second oscillator. It is characterized in that it is configured to calculate the depth of the concrete crack.

In addition, the simple ultrasonic device for measuring the concrete crack depth according to the present invention for achieving the above object is in the ultrasonic apparatus for measuring the crack depth of the concrete structure in close contact with the surface of the concrete structure, to a predetermined pulse signal flowing from the internal measuring circuit A first oscillator excited by and generating a first ultrasonic signal and a first oscillator receiving the first ultrasonic signal transmitted through a concrete surface and generating a first high frequency voltage is symmetrically left and right from the center of the rear surface thereof. Inserted into the left and right ends of the measuring instrument body in which first and second connectors are symmetrically formed, and a first connector connection part is formed at an end thereof to be electrically and physically connected to the first connector, and is introduced from the measuring circuit. A second oscillation excited by a predetermined pulse signal to generate a second ultrasonic signal A second extension portion inserted at one side of the rear surface thereof, and a second connector connection portion formed at an end thereof so as to be electrically and physically connected to the second connector, and receiving the second ultrasonic signal transmitted through the concrete surface. A second receiver for generating a voltage has a second extension inserted at one side thereof, and the measuring body has the first or second ultrasonic signal from the first and second oscillators to the first and second receivers. It is characterized in that it is configured to calculate the depth of the concrete crack by measuring the time of arrival.

Therefore, according to the said structure, the general person can also easily measure the depth of the concrete crack by simple operation.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a perspective view showing the external configuration of a simple ultrasonic device for measuring the concrete crack depth according to an embodiment of the present invention, Figure 3 is a rear view showing the back structure of the device shown in Figure 2, which is shown in Figure 2 As described above, the measuring apparatus includes a measuring body 10 and first and second expansion parts 20 and 30 slidingly connected to the left and right sides of the measuring main body 10, respectively.

The meter body 10 and the first and second extension parts 20 and 30 are in close contact with the concrete surface, respectively, so that the rear surface thereof is positioned on the same plane so as to measure the crack depth of the concrete structure, and one side of the rear surface thereof. At least one ultrasonic oscillation means or oscillation means is inserted to transmit / receive ultrasonic signals through the concrete surface, and a detailed description thereof will be described later.

The first and second extensions 20 and 30 are horizontally moved to predetermined spaces formed inside the main body of the meter 10 to adjust the position of the ultrasonic oscillation means or the oscillation means inserted into the rear surface thereof. The concrete crack depth is measured by holding the handle J1 formed at the ends of the first and second extensions 20 and 30 and adjusting the horizontal movement positions of the first and second extensions 20 and 30 by a predetermined distance. Done.

Hereinafter, the configuration of the apparatus according to the present invention will be described in more detail.

As shown in FIG. 3, the measuring body 10 is connected to a predetermined pulse signal introduced from an internal measuring circuit, which will be described later, of the measuring body 10 on a straight line with a first distance L1 from the center C1 on one side of the rear surface thereof. The first oscillator 11 is excited to generate the first ultrasonic signal and the first oscillator 12 receives the ultrasonic signal transmitted through the concrete surface to generate the first high frequency voltage.

In this embodiment, the first distance L1 is set to 15 cm so that the separation distance between the first oscillator 11 and the first oscillator 12 is 30 cm. This is because the distance between the first oscillator 11 and the first oscillator 12 is set to 30 cm in a general concrete crack depth measurement method such as the Tc-To method.

In addition, as shown in FIG. 2, the measuring unit main body 10 includes a display unit 13 for visually displaying measurement units and various operating states of the apparatus as well as a measurement value of the concrete crack depth on one side of the front face, and an operation of the apparatus. Key input unit 14 for selecting various measurement modes according to the selected and input setting of the measurement date, the unit of measurement and the like.

3, a second oscillator 21 is inserted into one side of the rear surface of the first expansion part 20 to be excited by a predetermined pulse signal flowing from the measuring device main body 10 to generate a second ultrasonic signal. A second receiver 31 is inserted into one side of the rear surface of the second expansion part 30 to receive the ultrasonic signal transmitted through the concrete surface and generate a second high frequency voltage.

The second oscillator 21 and the second oscillator 31 are installed symmetrically on the left and right in a straight line with the second distance L2 from the center C1 of the main body 10 respectively. The second distance L2 is set to a maximum of 30 cm so that the maximum separation distance between the 21 and the second receiver 31 is 60 cm. This is because the separation distance between the oscillator and the receiver is set to 30 to 60 cm in the concrete crack depth measurement method such as the T method and the BS-4408 method.

The first and second oscillators 11 and 21 and the first and second oscillators 12 and 31 use general oscillators for converting an ultrasonic signal (mechanical vibration) and a high frequency voltage (electric vibration). Both surfaces of the vibrator are, for example, silver plated to form an electrode. The vibrator is made of a piezoelectric material such as quartz, barium titanate, lead zirconate titanate, or the like.

In the present exemplary embodiment, the first or second oscillators 12 and 31 may selectively receive the first or second ultrasonic signals generated from the first or second oscillators 11 and 21 according to the measurement mode.

Therefore, the measuring instrument main body 10 has the ultrasonic signal arrival time from the first oscillator 11 to the first oscillator 12 and the ultrasonic signal arrival time from the second oscillator 21 to the second oscillator 31 for each measurement mode. Of course, the ultrasonic signal arrival time from the first oscillator 11 to the second oscillator 31 and the ultrasonic signal arrival time from the second oscillator 21 to the first oscillator 12 are selectively measured to calculate the depth of the concrete crack. do.

In addition, first and second sliding grooves 15 and 16 for horizontal movement of the first and second extension parts 20 and 30 are formed at the left and right ends of the back of the measuring instrument main body 10. Since the structure has a mutually symmetrical structure, only the connection structure of the first extension part 20 and the first sliding groove 15 will be described for convenience of description.

4 is a cross-sectional view of the main parts for explaining the connection structure of the first and second expansion portions 20 and 30 and the first and second sliding grooves 15 and 16 of the apparatus shown in FIG. 2.

In FIG. 4, a plurality of hemispherical locking grooves 17 (shown in dashed lines) are provided inside the first sliding groove 15 to fix the first expansion portion 20 at a predetermined position. An inner corner of the part 20 is provided with a spherical locking means 22 seated in the locking groove 17 as shown in the enlarged view of FIG. The locking means 22 is elastically supported by a spring 24 installed in the inner rectangular groove 23 of the first expansion part 20 to be spread over the locking groove 17.

In the present embodiment, the second distance L2 (see FIG. 3) of the first and second expansion units 20 and 30 is, for example, 3 to support a crack depth measurement mode such as the T method or the BS-4408 method. The locking grooves 17 are formed in pairs at three designated positions P1, P2 and P3 as shown in FIG. 4, and the locking grooves 17 are spaced 5 cm apart from each other. Put a distance

When the locking means 22 of the first and second extension parts 20 and 30 are located in the locking groove 17 at the P1 position, the first and second extension parts 20 and 30 are respectively measured. It is inserted into the first and second sliding grooves (15, 16) of the (10) completely as shown in Figure 5, in this case, the distance between the first oscillator 11 and the second oscillator 21 and the first receiver ( 12) and the distance between the second receiver 31 is set to 5 cm.

Meanwhile, as shown in FIG. 3, at one side of the bottom surfaces of the first and second sliding grooves 15 and 16, metal pieces 18 and 19 electrically connected to internal measuring circuits of the measuring body 10, which will be described later, may be cross-sectional views of FIG. 6. As shown in a-a 'of FIG. 3, a predetermined terminal piece (not shown) is positioned at one side of the inner surface of the first and second expansion parts 20 and 30 to be in contact with the metal pieces 18 and 19. ) Is inserted to make electrical connection between the second oscillator 21 and the second oscillator 31 and the measuring instrument body 10.

FIG. 7 is a block diagram showing a functional configuration of a measurement circuit mounted inside the main body of the measuring device 10. The key input unit 14, the display unit 13, the pulse generating unit 71, And a high frequency receiver 72, a memory 73, a program storage 74, and a controller 75.

In addition, the key input unit 14 selects various measurement modes (for example, the Tc-To method, the T method, and the BS-4408 method) and inputs a measurement unit, a measurement date, etc., as shown in FIG. 7. 141, a unit setting unit 142, and a date input unit 143 are provided.

The pulse generator 71 is to generate a predetermined pulse signal for ultrasonic vibration of the first or second oscillators 11 and 21 based on a predetermined control signal applied from the controller 75, and the high frequency receiver ( 72 is for distinguishing and applying the first or second high frequency voltage transmitted from the first or second receiver 12 and 31 that have received the ultrasonic signal when measuring the crack depth to the controller 75.

The memory 73 is for storing the measurement mode selection information, the measurement unit, the measurement date, and various measurement values calculated according to the operation of the apparatus set by the user, and the program storage unit 74 is a basic In addition to the operating program, the crack depth calculation routine for each measurement mode is stored.

The controller 75 controls the overall operation of the device according to the operation program of the program storage unit 74 and measures the crack depth of the concrete structure according to the measurement mode selected through the key input unit 14. It is for displaying and controlling the measured value on the display unit 13.

And the operating power of the measuring circuit of Figure 7 basically uses a battery, in this case, although not shown in the measuring instrument main body 10, a predetermined battery storage groove for storing the battery is provided.

Hereinafter, the operation of the simple ultrasonic device for measuring the concrete crack depth according to the temporary embodiment of the present invention will be described for each measurement mode according to the known Tc-To method, the T method, and the BS-4408 method.

In the first Tc-To method, the oscillator and the receiver are arranged at equal intervals (15cm) around the cracked area to find the ultrasonic arrival time when there is a crack and the ultrasonic arrival time when there is no crack at the same interval. It is a measurement mode that calculates the crack depth using time. (In this case, L1 = 15 cm in FIG. 8)

The second T method is a measurement mode in which the position of the oscillator is fixed and the depth of the crack is found by finding discontinuities in the ultrasonic arrival time at the crack while moving the receiver at a predetermined interval (for example, 5 cm). Shifted by 5cm at L1 = 15cm, L2 = 20, 25, 30cm of 8)

The third BS-4408 method uses the ultrasonic arrival time when the distance between the oscillator and the oscillator is set to 30 cm around the crack area, and the ultrasonic depth when the distance between the oscillator and the oscillator is set to 60 cm. This is the measurement mode for calculating ((L1 = 15cm, L2 = 30cm in this case).

According to the above measurement mode, the user smoothes the concrete surface to be measured for the crack depth (Cr) with sandpaper, grinder, etc., and then evenly applies the grease or glycerin to the concrete surface to facilitate the adhesion between the device and the concrete surface. After that, the user correctly positions the center C1 (marked on the device) of the device at the crack part Cr, and then operates the key input unit 14 to input / set the unit of measurement and the measurement date, and to measure the measurement mode. Will be selected.

In this case, when the user selects the Tc-To method as the measurement mode, the controller 75 of FIG. 7 transmits a predetermined control signal to the pulse generator 71, and the first oscillator 11 is applied from the pulse generator 71. The first ultrasonic signal is generated according to the predetermined pulse signal to be delivered to the concrete surface. The first receiver 12 receives the first ultrasonic signal transmitted through the concrete surface and converts the first ultrasonic signal into a first high frequency voltage, and the first high frequency voltage is applied to the controller 75 through the high frequency receiver 72.

Thereafter, the controller 75 obtains and stores the arrival time of the first ultrasonic signal in the memory 73 based on the time when the control signal for generating the pulse signal is applied and the time when the first high frequency voltage is received. When the first ultrasonic signal arrival time of the portion without a crack is calculated in the same manner, the control unit 75 calculates the depth of the crack Cr according to the operation routine of the program storage unit 74 to display the display on the display unit 13. Done.

In the case of the measurement mode described above, it is preferable to use the apparatus in a state in which the first and second expansion parts 20 and 30 are completely inserted into the measuring instrument body 10 as shown in FIG. 5.

On the other hand, when the user selects the T method as the measurement mode, the control unit 75 receives the first ultrasonic signal generated from the first oscillator 11 at the fixed position, as shown in FIG. 3 as well as the first oscillator 12. The operation of the pulse generator 71 and the high frequency receiver 72 is controlled so that the second receiver 31, which is moved by 5 cm to the points P2 and P3, can also be received.

In this case, the user moves the position of the second receiver 31 to the points P1, P2, and P3 at each measurement according to the guide message of the display unit 14, and the controller 75 controls the position of the second receiver 31. The depth of crack Cr is calculated by finding the discontinuous point of the ultrasonic arrival time according to the position shift. In addition, it is also possible to calculate the crack depth by fixing the position of the second oscillator 21 and adjusting the position of the second oscillator 31 during the measurement by the T method.

On the other hand, when the user selects the BS-4408 method as the measurement mode, the user not only accurately positions the center C1 of the apparatus at the crack part Cr, but also the first and second extensions 20 and 30 of FIG. After positioning at point P3, the measurement starts.

In this case, the controller 75 may determine the time when the first ultrasonic signal generated from the first oscillator 11 reaches the first oscillator 12 and the second ultrasonic signal generated from the second oscillator 21. By measuring the time to reach (31), and using this to calculate the depth of the crack (Cr), it is possible to solve the difficulty of the user to accurately specify and move the position of the oscillator and the receiver by each measurement position as in the prior art Will be.

Therefore, according to the embodiment described above, even a user without expertise simply places the apparatus on a concrete crack (Cr) site, and then adjusts the positions of the first and second expansion units 20 and 30 to various measurement modes. It is possible to calculate the crack depth according to.

9 is a perspective view showing the external configuration of a simple ultrasonic device for measuring the concrete crack depth according to another embodiment of the present invention, Figure 10 is a rear view showing the back structure of the device shown in Figure 9, as shown in FIG. It comprises a measuring instrument body 40 and first and second expansion parts 50 and 60 connected thereto, which is a modification of the configuration of FIG.

As shown in FIG. 9, the first and second extension parts 50 and 60 are provided with connector connecting parts 51 and 61 so as to be physically and electrically connected to the connectors 41 formed at the left and right ends of the measuring body 40. do. In addition, the measuring body 40 and the first and second extensions 50 and 60 are in close contact with the concrete surface, respectively, and the rear surface thereof is positioned on the same plane so that the crack depth of the concrete structure can be measured.

And as shown in Fig. 10, the measuring body 10 is a predetermined pulse signal flowing from the internal measuring circuit of the measuring body 40 in a straight line with a first distance (L1: 15 cm) from the center (C1), respectively, on one side thereof The first oscillator 42 is excited to generate a first ultrasonic signal, and the first oscillator 43 for receiving the first ultrasonic signal transmitted through the concrete surface to generate a first high frequency voltage. .

In addition, a second oscillator 52 is inserted into one side of the rear surface of the first expansion part 50 to be excited by a predetermined pulse signal flowing from the measuring device main body 40 to generate a second ultrasonic signal. On the rear side of the 60, a second oscillator 62 is inserted which receives the second ultrasonic signal transmitted through the concrete surface and generates a second high frequency voltage. The second oscillator 52 and the second oscillator ( 62 is provided so as to be symmetrical to the left and right in a straight line with a second distance L2: 30 cm from the center C1 of the measuring instrument main body 40, respectively.

As shown in FIG. 9, the measuring unit body 40 includes a display unit 44 and a key input unit 45, which have the same configuration as the display unit 13 and the key input unit 14 shown in FIG. 2. Since the internal measurement circuit provided in the main body 40 is the same as the configuration of FIG. 7, detailed description thereof will be omitted.

However, in the present embodiment, since the first and second expansion parts 50 and 60 are connected in the connector structure, the internal measuring circuit except for the T method which requires the positional movement of the first and second expansion parts 50 and 60. It is configured to support measurement mode of Tc-To method and BS-4408 method.

Therefore, according to the above configuration, the measuring instrument main body 40 has an ultrasonic signal arrival time through the concrete structure from the first oscillator 42 to the first oscillator 43 and the second oscillator 52 to the second oscillator 53. Based on the ultrasonic signal arrival time, the depth of the concrete crack can be calculated and the structure of the device can be further simplified.

As described above, according to the present invention, the oscillator and the oscillator are fixedly attached to the apparatus as well as a separate extension part which allows easy positioning of the oscillator and the oscillator for each measurement mode. It is possible to provide a simple ultrasonic device for measuring the concrete crack depth that can be measured.

Claims (7)

In the ultrasonic device that is in close contact with the surface of the concrete structure to measure the crack depth of the concrete structure, The first oscillator is excited by a predetermined pulse signal from the internal measuring circuit to generate the first ultrasonic signal, and the first oscillator receiving the ultrasonic signal transmitted through the concrete surface to generate the first high frequency voltage has a central portion on the rear side thereof. The main body of the measuring device which is symmetrically inserted to the left and right at a predetermined distance from the left and right ends, and the first and second sliding grooves are formed symmetrically to the left and right ends. A first expansion part connected to the first sliding groove and horizontally moved by a predetermined distance, and having a second oscillator inserted into one side of the rear surface thereof to be excited by a predetermined pulse signal flowing from the measurement circuit to generate a second ultrasonic signal; , It is connected to the second sliding groove is horizontally moved by a predetermined distance unit and one side of the rear side is provided with a second expansion portion in which a second receiver is inserted to receive the ultrasonic signal transmitted through the concrete surface to generate a second high frequency voltage, The measuring body may be configured to measure the time of arrival of the first or second ultrasonic signal from the first or second oscillator to the first or second oscillator to calculate a concrete crack depth. Simple ultrasound device for. The method of claim 1, A plurality of engaging grooves are provided in pairs inside the first and second sliding grooves to fix the first and second expansion portions at predetermined positions, respectively. On one side of the inner edge of the first and second expansion portion is provided a predetermined locking means seated in the locking groove, The locking means is a simple ultrasonic device for measuring the concrete crack depth, characterized in that configured to be elastically supported by a spring installed in the inner square groove of the first and second expansion. The method of claim 2, The first oscillator and the first oscillator are inserted at a distance of 15 cm from the center of the measuring instrument body, respectively. The locking groove is a simple ultrasonic device for measuring the concrete crack depth, characterized in that the second oscillator and / or the second oscillator is formed at each position that is moved in 5cm units at a distance of 20cm to 30cm, respectively from the center of the measuring body. The method of claim 1, The measuring circuit Display unit for visually displaying not only the measured value of the concrete crack depth but also the unit of measurement and various operating states of the device, Key input unit for selecting various measurement modes, and inputting and setting measurement date, measurement unit, etc. A pulse generator for generating a predetermined pulse signal for ultrasonic vibration of the first or second oscillator based on a predetermined control signal; A high frequency receiver for discriminating and applying the first or second high frequency voltage transmitted from the first or second receiver to the controller; A memory for storing the set measurement mode selection information, measurement unit, measurement date and various measurement values calculated according to the operation of the device; A program storage unit for storing the basic operating program of the device as well as the routine for calculating the depth of cracks for each measurement mode; And a control unit for controlling the operation of the apparatus according to the operation program of the program storage unit and measuring the crack depth of the concrete structure according to the measurement mode selected through the key input unit and displaying the measured value on the display unit. Simple ultrasonic device for measuring the concrete crack depth, characterized in that configured to. The method according to any one of claims 1 to 4, The measuring mode is a simple ultrasonic device for measuring the concrete crack depth, characterized in that at least one of the Tc-To method, T method, BS-4408 method. In the ultrasonic device that is in close contact with the surface of the concrete structure to measure the crack depth of the concrete structure, A first oscillator excited by a predetermined pulse signal flowing from an internal measuring circuit and generating a first ultrasonic signal, and a first oscillator receiving the first ultrasonic signal transmitted through a concrete surface and generating a first high frequency voltage Meter body inserted symmetrically in the left and right from the center of the back, and the first and second connectors symmetrically formed on the left and right ends, A first connector connecting portion is formed at an end thereof so as to be electrically and physically connected to the first connector, and a second oscillator inserted into one side of the rear surface of the second oscillator is excited by a predetermined pulse signal flowing from the measuring circuit to generate a second ultrasonic signal. First extension, and A second connector connecting portion is formed at an end to be electrically and physically connected to the second connector, and a second receiver, which receives the second ultrasonic signal transmitted through the concrete surface and generates a second high frequency voltage, is inserted into one side of the rear side thereof. A second extension, The measuring body may be configured to measure the time of arrival of the first or second ultrasonic signal from the first or second oscillator to the first or second oscillator to calculate a concrete crack depth. Simple ultrasound device for. The method of claim 6, The measuring mode is a simple ultrasonic device for measuring the concrete crack depth, characterized in that at least one of the Tc-To method, BS-4408 method.