KR20080111630A - Ultrasonic method for measuring concrete crack depth - Google Patents

Abstract

A method for measuring the depth of concrete cracks by ultrasonic waves is provided to simplify measuring procedure by using a dry couplant while removing the use of a contact agent for a probe. A method for measuring the depth of concrete cracks by ultrasonic waves includes the steps of turning on the power for preparing the measurement of the depth of a concrete crack(S1), placing an arrow marked in the center of a measuring device and pressing the arrow mark to a concrete surface(S2), primarily measuring data by a microcomputer by oscillating ultrasonic waves from an inner transmitting probe to an inner receiving probe(S3), secondarily measuring data by the microcomputer by oscillating ultrasonic waves from the inner transmitting probe to the inner receiving probe(S4), and obtaining required measurement values by displaying the depth of the crack via an LCD by operating the primary and secondary measurement values in the microcomputer(S5).

Description

Ultrasonic method for measuring concrete crack depth

1 is a perspective view of a portable ultrasonic concrete crack depth measuring apparatus according to the present invention.

2 is a front view and a display screen showing the position of the LCD display and the operation panel of the ultrasonic measuring apparatus.

3A and 3B show a conventional measuring method, FIG. 3A shows a first measuring step, and FIG. 3B shows a second measuring step.

4 is a view showing a measuring method of the present invention, showing that the first measurement step and the second measurement step can be performed simultaneously.

5 is a view showing a state in which the measuring device of the present invention in contact with the cracked concrete.

FIG. 6 is a diagram showing that the ultrasonic waves are oscillated by pressing the measurement button to make first and second measurements, and to obtain measured values using the data.

7 is a flowchart showing the procedure of the portable ultrasonic concrete crack depth measuring method.

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

1: measuring device body 2: measuring handle

3: inner transmitting transducer 4: inner receiving transducer

5: outer transmit transducer 6: outer receive transducer

7: Adapter for transducer connection 8: Center display

9: LCD Display 10: Operation Panel

The present invention relates to a portable ultrasonic concrete crack depth measuring method, and more particularly, to a method for quickly and accurately measuring the depth of the crack occurring on the surface of the concrete in the concrete structure. For this purpose, the measuring device uses two transmitting transducers and two receiving transducers, so that the correction according to the change of the concrete material can be performed by a calculation formula, thereby enabling fast and accurate measurement. In addition, by minimizing the circuit unit for transmitting and receiving the ultrasonic wave and digitally processing the received signal, it is easy to carry by embedding it in one case together with the power supply unit. In addition, the portable ultrasonic concrete crack depth measuring method of the present invention, the step of preparing for the ultrasonic concrete crack depth measurement by turning the power on, and after matching the arrow displayed at the center of the measuring device to the track of the concrete, the concrete Press the measurement button on the surface of the measuring device, press the measurement button on the surface of the measuring device, the ultrasonic wave is oscillated from the inner transmitting transducer to reach the inner receiving transducer, and the primary measurement of this data by the microcomputer; Then, when the measurement button on the surface of the measuring device is pressed, ultrasonic waves are oscillated by the inner transmitting transducer to reach the inner receiving transducer, and this data is also subjected to the secondary measurement by the microcomputer, and the first and the secondary by the microcomputer. Calculating a measurement value to display the crack depth by the LCD to obtain a desired measurement value.

In general, a concrete structure will be cracked when there is a problem in design or construction, or due to external damage factors. In some cases, not only are the cracks deep, but also the effect on the entire structure is minimal. On the other hand, some cracks can seriously affect the structure, so it is necessary to measure the depth of the cracks and take appropriate measures. The present measuring device aims to measure the depth of cracking in a short time by a simpler method, by escaping the method of measuring and calculating the depth of concrete cracking through a complicated procedure using a conventional ultrasonic probe.

Most of the infrastructure is of concrete construction, and as the common years of the structure increase, more and more attention is paid to maintenance. If accurate measurement of the depth of cracks that occurs from the time of construction is made, the concrete can be repaired and reinforced at the appropriate time, and the service life can be maximized by improving the durability of the concrete. Maximizing the service life will maximize the rebuild period of the facility, thereby minimizing the economic costs of the state and society.

Large-scale collapse can be caused by the crack of concrete. Accurate crack measurement can accurately determine the damage state of the structure, and can maximize the safety of the facility to prevent the collapse of the facility. Reinforced concrete structures can be maintained more safely.

Various methods are used for measuring the crack of concrete, but the above-mentioned method is known as a method capable of relatively accurate measurement, and the present invention implements a simple and accurate measurement by using a single measuring device for the inspection method shown in FIGS. 3A and 3B. The purpose is to

In order to perform the above method, first, the equipment for generating and receiving the ultrasonic wave is required, the ultrasonic wave is transmitted from the first transducer using two ultrasonic transducers, and then the ultrasonic wave signal reaches the second ultrasonic transducer. The time was measured. In this case, since the delivery speed is different for each concrete, a second task of obtaining an ultrasound delivery time by placing an ultrasonic transducer at a wider interval is required. In this case, two ultrasonic measurements must be made and the exact distance to place the two ultrasonic transducers must be marked on the concrete surface. In addition, after calculating the two propagation times, the calculations should be made according to the formula.

This method is widely used for diagnosing structures and most of the current ultrasound measurements are done in this or similar way.

Existing ultrasonic crackers for detecting concrete cracks are connected to the measuring device main body and the transducer by cable, applying a contact agent to the measuring site, fixing the transducer with both hands, and then performing two measurement processes. Therefore, at least two people are required to measure the signal, and it is inconvenient to go through a separate calculation process for the depth calculation, and there may be a difference in the calculated depth depending on the method and the formula used for the depth calculation.

However, these methods not only take considerable time to measure and calculate the depth of cracks, but also cause inconveniences of carrying the ultrasonic measuring device body, two ultrasonic transducers, a tape measure, and a calculator while moving. This difficulty also makes it possible for only experienced professionals to make relatively accurate measurements.

Therefore, the present invention greatly simplifies the measurement process by integrating the whole system to eliminate one-component connection and the use of dry captive to the transducer to eliminate contact. It also aims to reduce the number of measurements, increase the accuracy of crack depth estimation by using two pairs of dual channel transducers, and increase convenience by simplifying the calculation process by employing a microprocessor.

The technical feature of the present invention eliminates the connection process between the components by integrating a system such as the measuring device main body and the transducer, and uses a dry captive such as a ceramic ball instead of a liquid contact medium between the transducer and the concrete. By simplifying and using two pairs of transducers, the accuracy of crack depth estimation is improved and the microprocessor is adopted to simplify the calculation process.

Accordingly, the present invention has been invented to solve the above-described problems, the present invention is to measure the concrete crack depth The present invention is easy to set up the crack measuring device can be measured within a short time, but can be measured accurately And providing a method.

Another object of the present invention is to provide a portable ultrasonic concrete crack depth measuring apparatus and method that is easy to carry and can reduce preparation time for measuring.

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

1 is a perspective view of a portable ultrasonic concrete crack depth measuring apparatus according to the present invention.

2 is a front view and a display screen showing the position of the LCD display and the operation panel of the ultrasonic measuring apparatus.

3A and 3B show a conventional measuring method, FIG. 3A shows a first measuring step, and FIG. 3B shows a second measuring step.

4 is a view showing a measuring method of the present invention, showing that the first measurement step and the second measurement step can be performed simultaneously.

5 is a view showing a state in which the measuring device of the present invention in contact with the cracked concrete.

FIG. 6 is a diagram showing that the ultrasonic waves are oscillated by pressing the measurement button to make first and second measurements, and to obtain measured values using the data.

7 is a flowchart showing the procedure of the portable ultrasonic concrete crack depth measuring method.

1 and 2, the present invention provides a battery unit 11 (not shown) for driving the entire measuring device 100, a first transmission probe 3 for transmitting ultrasonic waves from the inside, and a first receiving the same. A receiving probe 4, a second transmitting probe 5 for transmitting ultrasonic waves from the outside and a second receiving probe 6 for receiving it, an LCD display 9 for displaying measurement conditions and results, and an operation panel for setting them (10), adapter for connecting the transducer (7) to fix the ultrasonic transducers (3,4,5,6) and to prevent the transmission of ultrasonic waves to the rear, not shown to allow correction if there is bending on the concrete surface Spring device (15), the center display unit (8) to display the center, the external device connection socket (14) for connecting the data to the outside to analyze the measured value and holding the measuring device with a constant force on the concrete surface Hand to pressurize Is achieved by the chin (2). And the transmission circuit 12 which is not shown in figure is built in.

The present invention provides a probe for use in nondestructive testing of a subject, a transmission / reception circuit for driving the probe, a digital signal processing circuit for processing the obtained ultrasonic signal, an operation panel for adjusting the same, and a measuring device body having the same. A portable ultrasonic concrete crack depth measuring apparatus having a portion, comprising: an ultrasonic transceiver unit comprising four ultrasonic transducers 3, 4, 5, and 6 arranged in a line on a contact surface with the concrete.

In addition, two transducers 3 and 5 of the four ultrasonic transducers are used for transmission, and two transducers 4 and 6 are used for reception.

The ultrasonic probe, the transmission / reception circuit, and the power supply unit are integrally formed.

In addition, the ends of the ultrasonic transducers 3, 4, 5, and 6 are formed in a pointed shape to serve to collect ultrasonic waves.

Adapters 7 for connecting the transducers fix the ultrasonic transducers 3, 4, 5, and 6 to the body and prevent the ultrasonic waves from being transmitted backward.

First, referring to FIG. 4, in the ultrasonic measuring apparatus according to the present invention, two transmitting transducers 3 and 5 and two receiving transducers 4 and 6 are arranged in a straight line.

When the pulse generated in the circuit part by the microcomputer reaches the inner transmitting transducer 3, an ultrasonic pulse is generated, and this ultrasonic energy passes through the lower end of the concrete crack and reaches the inner receiving transducer 4, and the circuit part transmits this transfer time. Measure

Soon after, the circuit part sends a pulse to the outer transmission transducer 5 to generate an ultrasonic pulse, which passes through the lower end of the same concrete crack and reaches the inner receiving probe 6, and the circuit part measures this propagation time. These two measurements are made within a very short time. The microcomputer calculates the two measurements and calculates the crack depth of the concrete by the formula below.

[Equation 1]

Next, specific steps of the portable ultrasonic concrete crack depth measuring method used for the non-destructive inspection of the present invention will be described in detail with reference to FIG.

First, the power is turned on to prepare for ultrasonic concrete crack depth measurement (step S1).

Next, as shown in Fig. 4, the arrow marked at the center of the measuring device is aligned with the track of the concrete, and then pressed against the surface of the concrete (step S2).

Subsequently, when the measurement button on the surface of the measuring device is pressed, ultrasonic waves are oscillated in the inner transmission transducer 3 to reach the inner receiving transducer as shown in FIG. 5, and this data is first measured by the microcomputer (step S3). ).

Immediately after the first measurement, as illustrated in FIG. 6, ultrasonic waves are oscillated from the inner transmission probe 3 to reach the inner reception transducer, and this data is also secondaryly measured by the microcomputer (step S4).

Now, the first and second measured values are calculated by the microcomputer and the crack depth is displayed on the LCD to obtain the desired measured values. (Step S5).

The measured value is obtained in an instant by a microcomputer.

As described above, since the portable ultrasonic concrete crack depth measuring apparatus and method according to the present invention are used in the concrete inspection, the crack depth measurement for the concrete structure can be performed quickly and accurately, thereby improving the reliability and efficiency of the inspection. There is.

In addition, the overall size is small, easy to carry and simple to use has the advantage of improved applicability and economics.

In addition, it is possible to use the present concrete crack depth measuring apparatus and method to measure the speed of the ultrasonic waves in the concrete by the surface method can be expanded to various applications.

While preferred embodiments of the present invention have 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 (1)

A step of preparing the ultrasonic concrete crack depth measurement by turning on the power, A step of pressing the arrow marked at the center of the measuring device on the track of the concrete and pressing it against the surface of the concrete; By pressing a measurement button on the surface of the measuring device, ultrasonic waves are oscillated in the inner transmitting transducer 3 to reach the inner receiving transducer, and the first measurement of this data by a microcomputer; Immediately after the first measurement, ultrasonic waves are oscillated in the inner transmission probe 3 to reach the inner receiving transducer, and this data is also secondaryly measured by a microcomputer; Step to obtain the desired measured value by calculating the depth of crack by LCD by calculating the first and second measured value by micom Ultrasonic concrete crack depth measurement method comprising a.

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