KR200258793Y1 - Ultrasonic concrete tester - Google Patents

Abstract

The present invention provides an ultrasonic concrete tester that can generate a powerful ultrasonic energy and efficiently receive the ultrasonic energy to inspect the condition of concrete easily and accurately. The ultrasonic concrete tester includes a measuring device for supplying power for generating ultrasonic waves, receiving ultrasonic waves passing through the concrete structure, and analyzing the received ultrasonic waves to inspect the state of the concrete structure; A sensor having a space formed therein, a first mounting groove communicating with the internal space at one end, and a second mounting groove spaced at a predetermined distance from the first mounting groove and communicating with the internal space at the other end. main body; Ultrasonic oscillator is fixed to the first mounting groove of the rod-shaped sensor body, for converting the pulse signal supplied from the measuring device into ultrasonic waves to enter the concrete structure in the thickness direction; And an ultrasonic oscillator fixed to the second mounting groove by a screw groove, for receiving ultrasonic waves passing through a predetermined distance of the concrete structure from the ultrasonic oscillator and transferring the ultrasonic waves to the measuring instrument.

Description

Ultrasonic Concrete Tester {ULTRASONIC CONCRETE TESTER}

The present invention relates to an ultrasonic concrete tester, and in more detail, is simple to use and handle, transmits powerful ultrasonic waves to a corresponding portion of a concrete structure and efficiently receives ultrasonic waves passing through a predetermined point to accurately determine the state of the structure. An ultrasonic concrete tester that can measure quickly and quickly.

In general, the strength, cracks, etc. of concrete should be inspected to check the construction condition, curing condition, safety condition, and continuous use after fire. Although the method of destruction is accurate, it is often impossible to measure by destruction, and in order to preserve the structure of the structure in its present state and not damage the appearance in consideration of damage to the structure, or deterioration of the structure due to damage, it is necessary to perform a nondestructive inspection. It is mainly done. Such non-destructive testing methods include visual inspection, radiographic examination, magnetic examination, ultrasonic examination, leakage inspection, and impact echo inspection. Among these inspection methods, the most accurate and easy to work, and can quantify the measured values and results, there is an ultrasonic test method, such as the ultrasonic test method is a portable ultrasonic concrete tester is used a lot.

As shown in Figures 1a, 1b and 1c, the conventional ultrasonic concrete tester is to place the oscillator and the oscillator called a sensor on one side of the concrete structure (1) to be measured, the oscillator for oscillating the ultrasonic wave to the concrete surface (2) and a receiver 3 for receiving the ultrasonic waves transmitted from the transmission oscillator. The ultrasonic oscillator and the ultrasonic oscillator (2,3) are connected to the measuring device 6 through the respective cables 4 and 5, which send a pulse to generate the ultrasonic wave to the oscillator and receive from the receiver. It is basically equipped with a display that can perform various analysis based on the signal and provide the result visually. Theoretically, in a structure such as concrete, when the elasticity or strength is high, the speed of ultrasonic transmission is high. On the contrary, when the elasticity or strength is low, the ultrasonic speed is slow. Based on this theory, the delivery time of ultrasonic waves in the main body, that is, the time from the oscillator to the oscillator, can be measured to calculate the transfer speed, compressive strength and crack depth of ultrasonic waves in concrete. have. Accordingly, the strength and elasticity of the structure to be inspected can be measured by non-destructive inspection, thereby allowing an overall evaluation of the quality of the structure.

In addition, as a measurement method using a conventional concrete tester, as shown in Figure 1a, by placing the ultrasonic oscillator and the ultrasonic transducer (2,3) at a point facing each other with the structure (1) in between to transmit and receive ultrasonic waves A direct method of analysis, and an indirect method of analyzing the ultrasonic waves flowing along the surface after placing the ultrasonic oscillator and the ultrasonic receiver 2, 3 on the proper surface of the structure as shown in FIG. As described above, there is a semi-direct method of disposing the ultrasonic oscillator and the ultrasonic oscillator 2, 3 in the diagonal direction of the structure.

The conventional method of the ultrasonic transmission and reception method for the conventional concrete tester is an indirect method illustrated in FIG. 1B, but there are various inconveniences in using this method. First, since the ultrasonic oscillator and the ultrasonic oscillator are used independently of each other, there is an inconvenience of always keeping the distance between them constant.

In addition, in order to transmit ultrasonic waves to concrete surfaces, it is necessary to use a kaplant such as glyceline and grease, so each time the kaplant is applied to each of the oscillator and the oscillator surfaces, and it is necessary to adhere to the concrete surface. There is a problem that the contamination occurs or must be cleaned after inspection.

In addition, since the ultrasonic oscillator and the ultrasonic oscillator must be in close contact with the concrete structure at a predetermined pressure or more, both hands of the operator must be used. Therefore, additional work personnel are required to record or store the measured values. There is a problem of deterioration.

Meanwhile, in the case of the direct method, the transmission speed of the ultrasonic wave is calculated as' the ultrasonic transmission distance (mm) / transmission time (시간) ', and in the case of the indirect method, the transmission speed of the ultrasonic wave is' 1.05 * ultrasonic transmission distance (mm) / The propagation time '. In any case, when using two independent sensors (ultrasonic oscillator and ultrasonic oscillator; the oscillator and the oscillator are made of the same structure, the oscillator can be used as the oscillator and the oscillator can be used as the oscillator. Since the distance between them changes, the distance is measured every time to calculate the transfer speed, or the measurement distance is displayed on the concrete surface, and there is a complicated and complicated problem of closely fitting the ultrasonic oscillator and the ultrasonic receiver to the part.

In the conventional method of measuring the depth of cracks generated in concrete, there is a metal part containing a vibrator, and since the point where the ultrasonic wave is incident and the point at which it is received are not known, the center of the crack is 30 cm and 60 cm, respectively. The method of estimating the depth of cracks by calculating the ultrasonic transmission time measured at intervals is mainly adopted. Even in this case, since two independent sensors are used, it is inconvenient to mark the concrete surface with 15 cm and 30 cm on each side of the crack, and then touch the sensor accurately to the part.

In addition, as described above, in the conventional ultrasonic concrete tester, there is a problem in that the sensor generates various ultrasonic waves of relatively weak energy, thereby limiting various measurement conditions.

Therefore, the present invention is designed to solve the problems described above, and an object of the present invention is to provide an ultrasonic concrete tester capable of accurately and quickly measuring the state of concrete.

Another object of the present invention is to provide an ultrasonic concrete tester capable of injecting powerful ultrasonic energy into the concrete and receiving the ultrasonic energy efficiently without additional auxiliary means to more accurately inspect the condition of the concrete.

Another object of the present invention is to provide an ultrasonic concrete tester that can easily inspect the condition of concrete alone as a tester.

Figure 1a, 1b and 1c is a side view showing a concrete measuring method using a conventional ultrasonic concrete structure tester, respectively.

Figure 2 is a perspective view showing the overall ultrasonic concrete tester according to the present invention.

3 is a cross-sectional view showing the structure of a sensor of the ultrasonic concrete tester of FIG.

4 is an enlarged cross-sectional view showing in detail the ultrasonic oscillator and the receiver of the ultrasonic concrete tester of FIG.

FIG. 5 is an enlarged cross sectional view showing a plate for mounting a screw for mounting a connector for connecting a sensor with a meter; FIG.

6 is a cross-sectional view showing a rod-type sensor which is equipped with an ultrasonic oscillator and an ultrasonic oscillator of the present invention, a built-in remote display portion, and used as a handle;

Figures 7a and 7b shows the use of the method for inspecting the crack and strength of the concrete structure using the ultrasonic concrete tester according to the present invention, respectively, and part of the use state shown in cross-section.

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

10: meter 12: cable

16: sensor body 18: gripping portion

28: first mounting groove 30: second mounting groove

34,52: Sound-absorbing ring 36,54: Housing

44,60: piezoelectric element 48,62: ultrasonic wave transmitting member

64: remote display and control panel 66: trigger switch

These objects, in the ultrasonic concrete tester having a power supply for generating ultrasonic waves, receiving ultrasonic waves incident on the concrete structure, and measuring the state of the concrete structure by analyzing the received ultrasonic waves, A space is formed in the first end, the first mounting groove is formed in communication with the inner space at one end, the other end is formed at a predetermined distance from the first mounting groove and the second mounting groove is formed in communication with the inner space Sensor body; An ultrasonic oscillator fixed to the first mounting groove of the sensor main body by converting a pulse signal supplied from the measuring device into an ultrasonic signal to inject ultrasonic waves into the concrete structure in a thickness direction; And an ultrasonic oscillator fixed to the second mounting groove by a thread, for receiving an ultrasonic wave passing through a straight line or a predetermined distance of the concrete structure from the ultrasonic oscillator and transmitting the ultrasonic wave to the measuring device. Can be achieved by

Hereinafter, an ultrasonic concrete tester according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 5, the ultrasonic concrete tester according to the present invention includes a measuring device 10 having a plurality of setting buttons or adjusting buttons 10a and a display 10b in which a setting value or a measurement value is displayed. The measuring device 10 generates an electric signal, transmits the electric signal to an ultrasonic oscillator, receives a signal using an ultrasonic oscillator, analyzes the received ultrasonic wave, and measures the state of the concrete based on the result. Such a measuring instrument is already well known to those skilled in the art, and thus detailed description thereof is omitted here for clarity. In particular, since the separation distance between the ultrasonic oscillator and the ultrasonic oscillator is defined as described below in detail, a program for calculating the transmission speed, the compressive strength, and the crack length of the ultrasonic wave may be built in. Accordingly, the measured value is calculated and displayed. It can be displayed in.

The meter 10 is connected to a generally cylindrical sensor body 16 which is connected by a cable 12. The sensor main body 16 is preferably provided with a holding part 18 forming a flat surface of a predetermined area on the upper surface and the lower surface so that the operator can easily grip the main body with one hand. The gripping portion 18 may be made of a synthetic resin material such as plastic to give a soft feeling when gripping. As a result, the sensor main body 16 is preferably formed in a yoke shape, that is, a yoke shape or a bar shape, which the user can easily grip and use with one hand.

As shown in FIG. 5, one end of the sensor body 16 is formed with a fixing groove 22 communicating with the inside of the body 16, and the fixing groove 22 has a cable connected to the meter 10. 12 is preferably inserted into the fixing plate 26 for mounting the connector to be connected.

In addition, as shown in FIG. 3, at one end of the sensor body 16, a first mounting groove 28 for mounting a transmission device, which will be described later, is formed to communicate vertically with the inside of the body. In the same manner, the other end of the main body 16 is spaced apart from the first mounting groove 28 by a predetermined distance and is also formed with a second mounting groove 30 which communicates vertically with the inside of the body. In particular, as will be described later, it is preferable that the second mounting groove 30 on which the receiver is mounted is formed at a position close to the measuring device so that even the weak ultrasonic waves can be accurately received.

In the first mounting groove 28 formed in the main body 16, an ultrasonic oscillator 32 for transmitting a pulse signal transmitted from the measuring device 10 to the concrete structure is mounted using a sound absorbing ring 34 made of sound absorbing material. . The ultrasonic oscillator 32 actually has an acoustic absorber ring 34 made of a sound absorbing material which is releasably inserted into the first mounting groove 28. The sound absorbing ring 34 is again inserted and fixed to the housing 36 using the sound absorbing packing 38. The housing 36 is formed of metal and preferably has a bottom surface of a predetermined thickness. In addition, the inner surface of the housing is preferably provided with an insulating material (36a). In particular, a packing 38 made of a sound absorbing material is preferably inserted between the sound absorbing ring 34 and the housing 36 to prevent the ultrasonic waves from flowing backward through the handle during measurement. The sound absorbing packing 38 is preferably a tape material mainly made of resin, but other sound absorbing synthetic resins are also possible. In addition, the sound absorbing ring 34 is also made of a sound absorbing material to prevent backflow of the ultrasonic waves.

On the other hand, inside the housing 36, a bolt-shaped support rod 42 is vertically fixed to a tab formed at the bottom of the housing, and a bolt-shaped support rod 42 having an insulating material 42a around the support rod 42 and the support rod 42. A plurality of ring-type vibrators, that is, piezoelectric elements 44, are stacked to generate ultrasonic waves. Each of these piezoelectric elements 44 is generally manufactured using a zirconium material and is firmly tightened by a nut 46 fixed to an end of the supporting rod 42. In this way, by constructing a plurality of piezoelectric elements 44 in a lamination method called a 'ran kitchen' type, powerful ultrasonic energy can be generated.

Due to the structure between the supporting rod 42 and the piezoelectric element 44, since the piezoelectric element is not in contact with any object except at the bottom of the bottom, all of the generated ultrasonic energy is transferred to the bottom, thereby providing powerful ultrasonic waves. Energy can be transferred to the concrete surface.

On the other hand, since the energy generated from each piezoelectric element of the oscillator 32 and transmitted to the lower portion cannot be directly transferred from metal to concrete, an ultrasonic wave transmitting member 48 is provided between the contact portion of the housing 36 and the concrete. It is preferable. Ultrasonic delivery member 48 is preferably formed of micro rubber and is also provided in a manner that surrounds or surrounds the bottom exterior of housing 36. On the other hand, it can be recognized that the ultrasonic transmission member 48 formed of the micro-rubber actually acts as a conventional kaplant. Optionally, although the housing 36 and the ultrasonic wave transmitting member 48 are formed in a flat shape, the bottom of the housing may be curved or convex for agglomeration of ultrasonic waves when the measurement interval is short. On the other hand, the ultrasonic transmitting member 48 is fixed to the housing by the metal ring 49, and more efficient transmission and reception is possible when the gap between the housing and the micro rubber to the gap (gap) by air.

Correspondingly, the first oscillator 32 provided in the first mounting groove is formed in the sensor body 16 is formed on the sensor body 16 for receiving the ultrasonic wave incident to the concrete structure and passing through a predetermined region such as the end of the crack 2 is detachably mounted to the mounting groove 30. The receiver 50 has a sound absorbing ring 52 releasably inserted into the second mounting groove 30. The housing 54 is inserted and fixed to the sound absorption ring 52. The housing 54 is formed of aluminum, has a bottom surface of a predetermined thickness, and the inner surface is preferably provided with an insulating material 54a between the piezoelectric elements. In particular, between the sound absorbing ring 52 and the upper portion of the housing 54, it is preferable to block the back flow of the ultrasonic wave with the sound absorbing material packing 56 in order to prevent the ultrasonic flow back through the handle when operating the sensor. The sound absorbing packing 56 is preferably a tape material mainly made of resin, but other synthetic resins are also possible.

On the other hand, inside the housing 54, a bolt-shaped support rod 58 fixed perpendicularly to a tab formed at the bottom of the housing and surrounded by an insulating material 58a, and for actually transmitting or receiving ultrasonic waves to the support rod 58. A plurality of stacked vibrators, that is, piezoelectric elements 60, are provided. Each piezoelectric element 60 is preferably formed of a zirconium material and is firmly tightened by a nut 46 fixed to the upper end of the support rod 58. In this manner, the plurality of piezoelectric elements 60 are configured in a lamination manner by a so-called 'ran kitchen' type.

By such a configuration between the supporting rod 58 and the piezoelectric element 60, the piezoelectric element can receive all the ultrasonic energy received through the bottom portion because the bottom surface of the bottom portion is in contact with the housing 54. .

On the other hand, since the ultrasonic wave cannot be directly received through the metal part of the bottom of the housing 54, the bottom of the housing 54 is preferably provided with the ultrasonic wave transmitting member 62 as in the case of oscillation. The ultrasonic transmitting member 62 is formed of micro rubber and is preferably provided in a manner that surrounds or surrounds the bottom outside of the housing 54. Optionally, in the figure the housing 54 and the ultrasonic transmitting member 62 are formed flat, in which case the ultrasonic transmitting member 48 is fixed to the housing by a ring 49 and a cream between the housing and the micro rubber. A more efficient reception is possible when the gap is caused by air using a type of Kaplant. In the case where the measurement interval is short, the bottom of the housing may be curved or convex for agglomeration of ultrasonic waves, in which case the transfer member may not be used.

Optionally, the sensor body may be provided with a control panel 64 which may perform some of the role of the measuring device as described above. The control panel 64 is disposed on a part of the holding part 18 of the sensor main body 16, and the display 64a which can display a measured value, and the button 64b which can stop and store the measured value displayed on a display. ). The button 64b is preferably formed in a hold / save form.

In addition, a trigger switch 66 capable of turning on / off the generation of ultrasonic waves or pulses may be installed at an appropriate position of the sensor main body 16. When the trigger switch is mounted in this way, ultrasonic waves or pulses can be generated only during measurement, thereby significantly reducing the power consumption of the battery.

6 is a cross-sectional view showing a rod-type sensor which is equipped with an ultrasonic oscillator and an ultrasonic oscillator of the present invention, a built-in remote display portion, and used as a handle.

Hereinafter, a method for inspecting or measuring the state of concrete using the ultrasonic concrete tester according to the present invention and its operation mode will be described in detail.

For example, as shown in Figure 7a, when inspecting the state of the cracks of the concrete structure (S), the worker grasps the handle 18 provided in the sensor body 16 is equipped with the ultrasonic transceiver device with one hand The sensor body 16 is disposed at a predetermined position of the concrete structure S so that the crack C portion or the portion where the crack is expected is located between the ultrasonic oscillator 32 and the ultrasonic oscillator 50. The case of measuring the delivery speed of the ultrasonic waves or measuring the compressive strength is illustrated in FIG. 7B.

In this arrangement, when the operator operates the measuring device 10 with the other hand and transmits an electrical signal to the ultrasonic oscillator 32, ultrasonic waves are generated and the piezoelectric elements 60 of the receiver 32 receive the ultrasonic waves. It is converted back to an electrical signal. Specifically, the piezoelectric element of the oscillator generates ultrasonic waves by an electrical signal, and the generated ultrasonic waves pass through the bottom of the housing 36 and enter the concrete structure S through the transfer member 48. At this time, since the piezoelectric elements 44 of the ultrasonic oscillator 32 are configured in a stacked manner and vibrate in the thickness direction with respect to the structure, ultrasonic energy that is significantly stronger than that of the conventional sensor is generated. In particular, such a strong energy is concentrated in the planar or cone-shaped transmission member 48 and concentrated in the concrete structure (S), and unlike the conventional case due to the efficient sound wave transmission of micro rubber to the contact surface or concrete surface of the sensor There is no need to use a separate Kaplant.

On the other hand, the ultrasonic wave incident into the concrete structure (S) by the ultrasonic oscillator 32 is refracted past the end of the crack (C) portion as shown in Figure 7a and then transmitted to the ultrasonic oscillator 50.

In this way, the ultrasonic wave transmitted to the ultrasonic wave oscillator 50 passes through the transmission member 62 in contact with the concrete structure S and the piezoelectric element 60 through the bottom of the housing 54 in reverse with the oscillator 32 described above. When delivered, these piezoelectric elements convert ultrasonic waves into electrical signals, which in turn deliver this excitation value to the meter 10 through the cable. In this case, it is preferable that the receiver is located close to the meter in order to avoid the electrical noise that may be caused by the connecting cable from the meter to the bar sensor and to minimize the reduction of the received signal along the length of the cable.

Then, when the electrical signal is transmitted to the measuring device 10, the measuring device 10 measures the transmission time of the ultrasonic waves, and based on the predetermined separation distance between the ultrasonic oscillator 32 and the ultrasonic oscillator 50 in the concrete structure The ultrasonic transfer speed, its compressive strength, the depth of cracks, etc. are automatically calculated, and the result is visually provided to the operator or the operator through the display 10a provided in the meter 10. Accordingly, the worker can check the state of the concrete structure.

On the other hand, when the control panel 64 and the trigger switch 66 are integrally provided in the rod-shaped sensor main body 16, the trigger switch 66 is used to supply an electric signal to the oscillator 32 to generate ultrasonic waves. Ultrasound is received by the oscillator 50 in the same manner as described above, and the measuring instrument body converts the transmission time of the ultrasonic wave into a transmission speed, a compressive strength or a crack depth, and then the measured value of the control panel 64 in the sensor body. It displays on the display 64a. At this time, the inspector holds the measured value with the button 64b. Thereafter, the pulse trigger switch is released to stop the pulse transmission, and then the button 64b is pressed again to store the measured value. The measured value is stored together with the preset measurement date, month, hour, minute, and measurement mode.

On the other hand, if you want to change the distance between the ultrasonic oscillator 32 and the ultrasonic oscillator 50 before or after the test work, it is possible to use a sensor made of a different length and the separation distance between the two sensors can ) And the control panel 64 in advance.

As such, when the state of the concrete structure is inspected using the ultrasonic transmitting and receiving device according to the present invention, the ultrasonic oscillator and the ultrasonic receiver are provided in one sensor while maintaining a fixed separation distance, so that the sensor is held by one hand and the other With one hand, you can work with the measuring instrument, so even a single operator can make accurate measurements. In addition, an ultrasonic transmitting and receiving device is provided in one sensor, and a control panel and a trigger switch may be integrally used for measurement, and once the device is set in the measuring device, the measuring operation can be easily performed using only the sensor.

As a result, according to the ultrasonic concrete tester according to the present invention, it is possible to generate a powerful ultrasonic energy to the concrete without any auxiliary means, and to efficiently receive the ultrasonic energy to accurately check the state of the concrete, the concrete alone as a tester The condition can be easily inspected, so that the accuracy of measurement, convenience of handling and workability can be improved.

In addition, as well as having an ultrasonic transceiver unit in one sensor can be used for measurement by integrally equipped with a control panel and a trigger switch, there is an advantage that can be measured more easily with only the sensor.

Although the preferred embodiment according to the present invention has been described above, it will be understood by those skilled in the art that various modifications and variations can be made without departing from the scope of the appended claims.

Claims (10)

An ultrasonic concrete tester having a power supply for generating ultrasonic waves, receiving ultrasonic waves incident on a concrete structure, and measuring the state of the concrete structure by analyzing the received ultrasonic waves, A space is formed therein, and a first mounting groove communicating with the internal space is formed at one end, and a second mounting groove spaced apart from the first mounting groove at a predetermined distance and communicating with the internal space is formed at the other end. Sensor body; An ultrasonic oscillator removably inserted into the first mounting groove of the sensor main body, the ultrasonic oscillator having a structure for injecting ultrasonic waves supplied from the measuring device to the concrete structure in a thickness direction; And The ultrasonic concrete tester is detachably inserted into the second mounting groove, and includes an ultrasonic wave receiver for receiving the ultrasonic wave passing through a predetermined portion of the concrete structure from the ultrasonic wave oscillator and transmitting the ultrasonic wave to the measuring device. The ultrasonic oscillator of claim 1, wherein the ultrasonic oscillator is a sound absorbing ring releasably inserted into the first mounting groove, a housing having an upper portion inserted into the sound absorbing ring, a support rod vertically fixed to the housing, and extrapolated to the support rod. Ultrasonic concrete tester, characterized in that it comprises a piezoelectric element for stacking and generating ultrasonic waves, and an ultrasonic transmitting member provided on the outer side of the lower end of the housing. The ultrasonic concrete tester according to claim 2, wherein an insulation packing is inserted between the sound absorbing ring and the upper portion of the housing to prevent the ultrasonic wave from flowing backward through the handle during measurement. The ultrasonic concrete tester according to claim 2, wherein the ultrasonic wave transmitting member is formed of micro rubber and is formed in a cylindrical shape or a dome shape. The method of claim 1, wherein the ultrasonic receiver is a sound absorbing ring releasably inserted into the second mounting groove, the housing is inserted into the sound absorbing ring, the upper portion of the support rod vertically fixed to the housing, and extrapolated to the support rod Ultrasonic concrete tester, characterized in that it comprises a piezoelectric element for receiving the ultrasonic wave laminated and the lower end of the housing. The ultrasonic concrete tester according to claim 5, wherein an insulating packing is inserted between the sound absorbing ring and the upper portion of the housing to prevent the ultrasonic wave from flowing backward through the handle during measurement. The ultrasonic concrete tester according to claim 5, wherein the ultrasonic wave transmitting member is formed of micro rubber and is formed in a planar shape or a dome shape. The sensor body according to any one of claims 1 to 7, wherein the sensor body includes a control panel having a display capable of displaying the measured value and a button capable of stopping and storing the measured value displayed on the display. Ultrasonic concrete tester. The ultrasonic concrete tester according to any one of claims 1 to 7, wherein the sensor main body is provided with a trigger switch for controlling or turning on / off the generation of ultrasonic waves or pulses. The ultrasonic concrete tester according to any one of claims 1 to 7, wherein the main body is formed in a yoke shape or a rod shape.