JPS61138158A - Flaw detecting method - Google Patents

Abstract

PURPOSE:To perform accurate inspection only by working a material to be flaw-detected slightly, and to facilitate operation by forming a hole in the object material and inserting a measuring rod provided with a transmitter and receiver, and transmitting and receiving an ultrasonic wave and detecting a flaw. CONSTITUTION:The measuring rod 5 is inserted into the hole 2 bored in the material 1 such as concrete with a drill, etc., an ultrasonic wave is transmitted by the transmitter and receiver 4 of an ultrasonic wave generating device 3 provided to the rod, and its reflected wave from a crack 10 is received by the transmitter and receiver 4; and the result is displayed on a display device using a cathode-ray tube or annunciated by an annunciator 6 such as a buzzer and a lamp to confirm the crack 10. Here, the measuring rod 5 is moved axially by a driving device 8 and also rotated circumferentially. The hole 2 bored in the material 1 is charged with almost the same material or a proper filler after the flaw detection.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the R11 method for searching for 4 cracks, 2 iron, and scratches inside concrete-a objects such as elevated roads and buildings, or wood and metal 4-8. It is something.

Conventional technology Conventionally, if a crack occurs inside concrete structures such as elevated roads, beams, buildings, etc., or inside wood or other objects, ultrasonic diagnosis, magnetic field meter-1 radiation Is clinic, etc. are used as traps. More non-destructive testing will be performed.

Then, the radius, size, age, etc. of the break are measured. However, when the material is non-uniform like concrete and the situation is complex, the above measurement method may not be sufficient. It is said that accurate measurement is difficult with non-destructive testing.

The two-probe method is used for the two-probe method and the transmission method.

-A typical example of Et shooting using the S tentacle method is spear 6.
As shown in Figures ~ O8, vertical method, oblique method,! l! There are many other methods.

In the vertical method, as shown in the figure, ultrasonic waves are emitted from a probe placed in one material, and the reflected waves from the cracks atP are damaged. The oblique angle method uses the intersection of ultrasonic waves transmitted diagonally to the material A and the back surface 11 of the material No. Detect defects.

Next, in the double-probe method in the two-probe method, as shown in Fig.
The ultrasonic wave emitted from the skin holder 0 and obliquely emitted through the crack 6 is received by the receiver f. What is the transmission method? 1 on both sides of the material island as shown in Figure 10.
Ultrasonic waves are transmitted and received by the transmitter e and the receiver f, which are located between the transmitter e and the receiver f, and the crack 0 between them, f, is detected because it is difficult for the ultrasonic wave to pass therethrough.

In the case of the above-mentioned 14m point, which the invention is supposed to solve, the direction of the recess and the direction of propagation of the ultrasonic wave have a fixed relationship of 1c (both echoes are often parallel). It is difficult to obtain a KIER image of a crack because the reflected waves behave in a complex manner.

In addition, it is necessary to have reliable contact between the probe and the material a (Qs, Wi), but it is difficult to control this.To solve this problem, the entire material, v!a, is submerged in the liquid. There is also the so-called water immersion method, which performs measurements using water, but it is difficult to apply it at the inspection site.

In addition, in the method of losing the probe after losing the probe, in most cases the direction of the binding line and the direction of propagation of the ultrasonic wave are in the same direction. etc., it is difficult to obtain an accurate 4-repo image.This invention can be applied to each of the above 14-point tP! K to decide 7fi
The purpose of this test was to inspect only 72 materials:
The object of the present invention is to provide a flaw detection method that can perform inspection more accurately than the other methods described above by simply performing 2IO processing, and that can be performed simply.

This invention will be described with reference to drawings showing embodiments.1. ?
There is 8 in Figure 1, and the material j to RWI! Form hole 2 in 41,
The hole 2Kffl sound wave is generated! A fixed *5ft divine man is equipped with a transmitter/receiver 4 of II3, emits an FF1F wave from the transmitter/receiver 72, and damages the transmitter/receiver 4 by the reflected wave of the ultrasonic wave. This is a flaw detection method characterized by displaying or notifying the location on a display device or a notification device 6.

Note that the transmitter/receiver 4 is not limited to an integrally shaped transmitter/receiver, but a transmitter 18 and a receiver are each provided separately in the first fixed #5. It also includes such conditions.

Further, 8 in the figure is a driving device for the measuring rod 5, and the device 1
．． 8 moves the measurement i45 in the axial direction 2, and can rotate it in the direction of the axis. 9 is a conductor,
10 indicates a crack.

Insert the measurement 9a5 into the hole 2 formed by a drill or the like in the material 1 such as working concrete, emit ultrasonic waves from the transmitter/receiver 4 of the ultrasonic generator t3 provided therein, and
The transmitting/receiving device 4 receives the reflected wave, and the crack 10 is recognized by displaying or notifying the user using a display device using a tube or the like, or a notification device such as a buzzer or lamp. As shown in Fig. 1 and Fig. 2, holes 2 are formed in this concrete layer using a drill or the like as an example of the material 1. This hole 2 is formed in the material 1 in a substantially perpendicular direction. fL of hole 2
The diameter is made slightly larger than the diameter of the measuring rod 5. Further, the depth is set to correspond to the depth of the crack @lO to be measured. The diameter of the hole 2 is - for example 10~
It was formed to the level of L5 curse.

Next, fill the hole 2 with a liquid that does not interfere with the ultrasonic wave Q4, such as grease or oil, which is easily affected by sound waves. A transmitting/receiving IH element 4 as a probe is embedded in one part of a solid round bar or corner 1, and the ultrasonic wave can be emitted in a direction substantially perpendicular to the beam.

Total of 10 cracks? In a typical example, the 5f wave shielded by a material such as concrete hits the parting point 1o, and the transmitted Hi# wave is received by the transmitter/receiver 4, which is displayed as a brown f, etc. By imaging with device 6. Then, at this time, by keeping the insertion depth of the measuring rod 5Q constant and rotating the constant 9a5 once in the axial direction, and comparing the image of the part of the reflected wave that is radiated again in the shortest time on the Brown 7, we get -As an example, it is shown in Figure 5.

This L5 jI! - When the images are collected at different depths of a constant 5, a three-dimensional image of the crack 10 in the material 1171 is obtained. In this case, the back of the measuring rod 5 as shown in Figure 1! 8 Y lfl makes it easy to make 1 yen.

However, the drive device 8 described above may not be used, and the operation may be performed manually.

Then, by utilizing the directness of the individual sound wave in the material 1 and the main reflectivity when it hits the secondary seam 10, it is displayed on the cathode ray tube in a method equivalent to radar when using waves. .

A simple method for processing 111 reports such as this one is to form a hole 2 in the material, insert a measuring rod 5 into the hole 2, and apply ultrasonic waves almost perpendicularly to the measuring rod 5. I'm disappointed in the fact that I made this happen. The skin wave number of ultrasonic waves is selected appropriately by considering the straightness of propagation of ultrasonic waves, attenuation properties, etc. of one circle of material. Ultrasonic waves can be transmitted and received in many directions simultaneously.
45 in one measurement! ! - It is also possible to shorten the settling time by attaching an imaginary transmitter/receiver 4.

Note that the holes 2 formed in the material 1 at the gills are filled with approximately the same # grade or an appropriate filler after the exploration fI is completed.

The Young Fruit of the Invention Since the present invention has been established as described above, it is possible to perform inspection more accurately than the above-mentioned conventional methods by only applying a slight lining to the material. .

In addition, the work can be made relatively simple.Furthermore, the information processing of the obtained cross-radial waves can be done relatively simply.

[Brief explanation of drawings]

Figure 71~? Figure 5 shows an embodiment of the present invention, and Figure 1 shows an outline of the flaw detection method. ? 2nd figure is 1st figure ■
-1141 arrow view 1. ? Figure 3 is an enlarged view of the part of the device shown in Figure 1, Figure 4 is a w-wig view of Figure 3,
Figures 1 to 5 are enlarged views of the portion shown in Figure 1. ? Figures 6 to 10 are diagrams showing the outline of the flaw detection method for stirrups. Measuring rod 6...Display layer weight or notification device Substitute person Masu filler Shield Fuji Yu (2 idiots) Figure 1 Figure 6 Figure 10 r'! J

Claims (1)

[Claims] A hole is formed in the material to be inspected, a measuring rod equipped with a transmitter/receiver of an ultrasonic generator is inserted into the hole, an ultrasonic wave is emitted from the transmitter/receiver, and the reflected wave of the ultrasonic wave is detected by the transmitter/receiver. A flaw detection method characterized by receiving the received signal and displaying or notifying the received signal on a display device or a notification device.