JPS59148853A - Nondestructive testing method of concrete product or the like - Google Patents

Abstract

PURPOSE:To detect simply and precisely internal defects of concrete products on a nondestructive basis by transmitting a specified radiation and measuring. CONSTITUTION:A minute amt. of radiation irradiated from a radiation source 2 such as cobalt 60 or cesium 137 stored in a lead vessel 3 etc. which is set to a cylindrical concrete product 1 or the like by a jig 7. The radiation transmitted through the product 1 is detected by a detecting device 4 having a scintillator 5 consisting of sodium iodide etc. and a light amplifier 6. The detected value is treated with a pulse height analyzer to obtain a faired pulse which is recorded on a tape recorder etc. Then the regenerated recorded value in a control laboratory or the like is converted into a radiation counting rate. Thus the internal defects of the concrete products are detected simply and precisely on a nondestructive basis according to the predetermined reference information relating to the counting rate and the defects.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a non-destructive testing method for cosiclete products and the like.

Traditionally, cylindrical cosiclete products formed by centrifugal force or cylindrical cosiclete products filled in steel pipes are long, making it impossible to visually inspect cosiclete thickness, internal density, internal cavities, etc. , and relied exclusively on human sensations such as those of Hashimarishita.

In order to eliminate such unreasonableness, the present invention provides a method for non-destructive inspection of Cosiclete products, etc., which is characterized by scientifically detecting and measuring internal defects of Cosiclerete products in a non-destructive state. be.

An embodiment of the present invention will be described with reference to the drawings.
) and (in Figure 1) show the inspection and measurement equipment used on-site or in a factory to carry out the present invention, (1) is a specimen made of a cylindrical cosiclete product to be inspected and measured, (2)
) is sealed cobalt 6o or secilum 187 10
A radiation source that emits minute radiation of less than 0 micrometers of radiation, and is housed in a radiation source storage vessel (3). (4
) is a pulse detector/device that uses a sodium iodide crystal cicitilator (5) and light 1. to detect the radiation emitted from the radiation source (2). This is where the electric booster tube (6) is stored.

(7) is a jig that can take the above-mentioned radiation source storage vessel (8) and pulse detector (4)), and is designed to allow spot measurements to be made freely. The radiation source (2) and the detector (4) are set on the center line of the specimen (1).

(9) is the main amplifier for further amplifying the dose detected by the photomultiplier tube (6), and Qo is this I! pulse height analyzer for shaping the pulses of the quantity (1υ is the main amplifier of these (
9) and the power source for the pulse height analyzer α0, g D/D batteries are stored. (8) is a storage box that stores these items together. (b) is a tape coater for recording the pulses shaped by the pulse height analyzer Ql onto the tape of the first signal, and 03) is the recording tape thereof.

0 is a micrometer that blows into the area to be measured, 0
5) is an operation box for starting inspection and measurement, which houses a device that automatically performs measurement for a predetermined period of time when operation button 06) is pressed.

Note that all of the above-mentioned devices are electrically connected.

Figure 2 shows the device used to judge the results of measurements taken on-site or in a factory.It is usually installed in a control laboratory, and it reproduces the pulses of the specimens such as Cosicrete products recorded in the first test. It is converted into a counting rate (karashito number).

In the figure]) is a tape coater that plays back the recording tape 03) recorded in the first round on the tape (A), and the reproduced pulses are broadcast by the speaker and the counting rate meter (C). Convert it to the count rate using the count rate meter (
The counting rate is displayed by the counting rate recorder (c) and recorded on the recorder paper (2) by the counting rate recorder (c). (Support) is a power supply box for these instruments, which houses a 2-port battery. Note that all of these meters are electrically connected.

Figure 3 shows an example of the counting rate (number of mustards) recorded on the recorder paper (b) in Figure 2, and shows an example of the standard/!
;, 000 tJ cow, diameter 3! ; Om, which shows the relationship between the counting rate (tJ number) and the cosiclete thickness at each measuring point of the specimen with cosiclete thickness SO■0
That is, measurement point number of cosicletes cosiclete thickness A l lS, OOOSOtlII + A
2 /Q-,000! ;! ; mA
8 /7,000 l12゜5 simple A 4 /3,000 1
,0 ■A 5 /! ;,000
! ; indicates Ow.

The above relationship was determined using the test shown in Figure 1, a graph showing a constant curve. In the example, the diameter is 3! ; Ow, this is an example of a verification curve between 30 m and g Owa of the cosiclete thickness. In the above example, the pulse of the amplified radiation dose is recorded on a recording tape by a coater and managed. This is sent to a testing laboratory, reproduced, and converted into a count rate; however, the present invention is not limited to this, and as shown in Figures 7 and The pulse is sent to the wireless device), and the measurement pulse is transmitted via the transmitter ``j@'', and the radio wave is received by the receiver c (Asitena Foundation) in the control test room, which is then transmitted to the You may make it convert into a counting rate similarly to an Example.

To explain the inspection procedure in more detail in the embodiment configured as described above, first, we will start with Figure S (A) and Figure 5.
As shown in the figure), the circumferential surface of the specimen (1) made of a cylindrical cosiclete product is a+ at intervals of O degrees.

Mark measurement points a2, a3, al', a2', a3', and also mark b+, b2. ba-
Mark the measurement points such as -m-.

Next, attach the radiation source (2) and detector (4) to the mounting jig (7) so that the radiation source (2) and detector (4) are on a straight line passing through the center of the specimen (1). set. This state is shown in Fig. S (B) and Fig. S (C).

Next, as shown in Figure 6, the main amplifier (9), the wave height analyzer O
Electrically connect the box (8) containing the I and the battery (11), the tape (b), the microphone (04), and the hand control box, and set it in the storage box (8). Turn on the power switch and apply voltage to all measuring devices to complete measurement preparation.

Next, by pressing the operation button (16) on the hand-held operation box 05), the pulse signal of the radiation chalcite number in the direction of al-a+' is automatically amplified for 30 seconds and transmitted from the pulse height analyzer.

This pulse signal is recorded on the 2-track 2-channel stereo tape and recorded on the 1st channel 1st track of the recording tape 03) of the coater 0. At the same time, the measurement point number is recorded using the microphone 0→ 0 → attached to the 2nd channel. The signal to start the measurement is audio recorded on the second track. Next, move the jig (7) in the circumferential direction of the specimen (1), measure points a2-C3 using the same procedure, and then move the jig (7) to the specimen (1).
1) Moving in the length direction and adjacent measurement point b+ in the circumferential direction
, bz, ba---- Perform first class measurements and complete measurements in the field or factory.

Next, tape and send the recording tape 03) recorded by the coater (b) to the management testing room! Connect the terminal of the first channel of the 0υ channel stereo recorder (A) to the counting rate meter (C), and then connect the terminal of the first channel of the playback channel coater Q ).

In addition, a speaker (2) is connected to the terminal of the second chip of tape coater Q◇ so that the measurement point number and the signal to start measurement can be heard audibly.

Next, turn on the power to the station recorder Qυ, count rate meter (c), and count rate recorder and press the push button switch.
I am 70 years old, and the number of pulses of the first = ft sinel pulse signal of the coater Qυ passes through the count rate meter (c) and the count rate recorder (
C) is recorded. In this case, the number of the measuring point and the signal to start the measuring point can be heard as audio from the second channel, so the measurer writes them on the self-recording sheet (a). In this way, it is determined whether the thickness of the product is thicker or thinner than the standard based on the mustard number of each measurement recorded in the self-recording sheet (on the measuring paper) based on the graph of the test curve.

As described above, the present invention emits minute radiation such as cobalt-60 or cesium-187 onto the surface of a specimen such as a Cosiclete product, passes through the specimen, detects the radiation dose, and increases the pulse by rlJ shaping. This method relates to a non-destructive testing method for Cosicrete products, etc., which is characterized by measuring by an appropriate means and converting it into a count rate7. It is possible to scientifically measure and identify internal defects in Cosiclete products, etc.

4. Brief description of the drawings The drawings show the apparatus for carrying out the present invention, and are
1ffl (A) is a layout diagram of the equipment at the site or in the factory, Figure 1 (B) is a cross-sectional view taken along the line x-X of Figure 1 (A), and Figure 2
The figure is a layout diagram of the equipment in the control test room, Figure 3 is a plan view showing a part of the recorder paper displaying the number of mustards recorded in the control test room, and the second figure is a graph showing the verification curve of the number of mustards. (Figure S (A), middle of Figure 5).

Figure S (C1 is an explanation showing the measurement procedure in the field or factory)
1)...specimen, (8)...radiation source, shi)...-
Detector, (9)... Main amplifier, C1... Wave height analyzer, 02)... Cheap rate meter, (c)... Count rate meter.

Patent applicant: Kansai Electric Power Co., Ltd. Same as above: Kinki Fusikret Industries Co., Ltd. - Upe
, 5 Me2P'1 ) Be 4 Thoughts 1111 →-ko>29-t/i゛之 (%-1) Now Pej Ha (A) 2\y Ha (6) → Be f Ha ( 0gibe 6 ha

Claims (1)

[Claims] ■ On the surface of a specimen such as a Cosiclete product] Paltro 0
Or a cosiclet characterized by emitting minute radiation such as cesium 187, detecting the radiation dose by passing it through a specimen, amplifying and shaping the pulse, measuring it by an appropriate means, and converting it into a count rate. Non-destructive testing method for products, etc. ■ A Cosicrete product, etc. as set forth in claim 1, characterized in that the amplified radiation dose pulse is recorded on a tape]-tar, sent to a control laboratory for reproduction, and converted into a count rate. Non-destructive testing method. ■ A method for non-destructive testing of Cosicrete products, etc. as set forth in claim 1, characterized in that a pulse of amplified radiation dose is transmitted by a radio, received in a control laboratory, and converted into a count rate. .