JPH0364832B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a peeling state measuring method for detecting the adhesion state of tiles etc. attached to the wall surface of a building and measuring the depth of the peeled part. .

[Prior art] A striking sound-type peeling detection method that detects the peeling state of wall tiles, etc. by hitting the wall with a certain amount of momentum is as follows:
Many proposals have already been made by the applicant.

By the way, the conventional impact sound-based peeling detection method focuses only on the difference in the impact sound spectrum between the healthy part and the peeled part, and converts the time series of the impact sound into the frequency domain to make a determination. There were some shortcomings. That is, (1) It takes a long time to convert the impact sound data from time series to frequency domain, which poses a problem in reducing the peeling determination processing time.

(2) When converting from the time series domain to the frequency domain,
Due to conversion errors, a healthy part was sometimes misdiagnosed as a peeled part, or vice versa.

(3) Although it is possible to determine the presence or absence of peeling based only on the impact sound, it is not possible to judge the depth of the peeled part, which is necessary for selecting a repair method.

[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned problems of the conventional impact sound type peeling detection method, and its purpose is to shorten the peeling judgment processing time. It is also possible to improve reliability by virtually eliminating misdiagnosis, and it is also possible to determine the depth of peeling parts necessary for selecting repair methods, etc. The condition of peeling of wall tiles etc. Provides a measurement method.

[Means for solving the problem] When hitting a wall with a certain amount of momentum, the magnitude of the time-series waveform should not exceed a certain value in the case of a sound from a sound part, and in the case of a peeling part, the repulsion from the wall should be There is a characteristic that the force increases as the peeled portion becomes deeper, and the present invention has been made based on these principles.

According to the present invention, by striking a wall surface with a constant momentum and comparing the magnitude of the time-series waveform of the striking sound captured by the sound receiver with a previously determined criterion value for the striking sound. The presence or absence of peeling is determined, and peeling is detected by comparing the magnitude of the repulsive force from the wall detected by a load detector attached to the impact hammer with a predetermined criterion value for repulsive force. Determine the depth of the part.

In this specification, "magnitude" refers to the peak value of the amplitude of the waveform, the magnitude of the time-series waveform of the impact sound refers to the maximum value of the amplitude of the waveform, and the magnitude of the repulsive force refers to the peak value of the amplitude of the waveform. It means the maximum amplitude of the waveform of the repulsive force that the vessel receives.

[Operations and Effects of the Invention] According to the method for measuring the peeling state of wall tiles, etc. of the present invention, the following excellent effects can be obtained.

(1) Since there is no need to frequency convert percussion sound data, it is possible to significantly shorten the time needed to determine detachment for one percussion to approximately 1/30 (from 6 seconds to 0.2 seconds) compared to conventional methods. .

(2) Since conversion from the time series domain to the frequency domain is not performed, conversion errors associated with this do not occur, and erroneous diagnosis is eliminated, improving reliability.
Furthermore, as the data variation becomes smaller, it becomes possible to detect small peeling parts and deep peeling parts, improving detection performance.

(3) In the case of a peeled part, the depth of the peeled part can be determined based on the repulsive force from the wall surface during impact, so it is possible to appropriately select a repair method.

[Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows the sound pressure distribution of the peeled part when hitting a wall surface, which is higher than that of the healthy part.The horizontal axis shows the sound pressure of the impact sound, and the vertical axis shows the measured sound pressure. N indicates the frequency of occurrence of the sound pressure, and N indicates the number of measurements. In other words, 90 times for the healthy part and 212 times for the peeled part.
This figure shows the frequency distribution of the sound pressure of a total of 302 hits. Note that the tester knows in advance whether the test piece to be measured is a healthy part or a peeling part, and it is natural for the tester to know whether the sound pressure of each blow is from a healthy part or a peeling part. The frequency distribution shown in FIG. 1 is obtained.

Further, the judgment reference value P ₀ regarding the sound pressure of impact sound shown in Fig. 1 can be calculated by, for example, the following formula, assuming that the average value of the sound pressure of impact sound in a healthy part is P ₀ AVE, and its standard deviation is P ₀ δ. If it is smaller than P ₀ , it can be determined that it is a healthy part, and if it is larger than P ₀ , it can be determined that it is a peeled part.

P ₀ = P ₀ AVE + 3 x P ₀ δ Figure 2 shows the impact test conducted on two types of peeling areas: the peeling area on the back of the tile (shallow peeling) and the peeling area on the building frame (deep peeling), and the two types were attached to a hammer. This shows that the repulsive force from the wall captured by the load converter is small in the case of shallow separation and large in the case of deep separation.The horizontal axis shows the magnitude of the repulsive force from the wall, and the vertical axis indicates the frequency of occurrence of the measured repulsive force, and N indicates the number of measurements. That is, the exfoliated area on the back of the tile was struck 104 times, and the exfoliated area on the frame was struck 108 times, and the repulsive force at the time of the impact was a total of 212 times, and the frequency distribution is shown in relation to the magnitude of the repulsive force.

In addition, the criterion value F ₀ of the repulsive force shown in Fig. 2 is:
For example, in Figure 2, the average value and standard deviation of the repulsion force for peeling on the back of the tile and peeling on the frame are shown.
Assuming AVE ₁ , AVE ₂ and δ ₁ , δ ₂ , they can be determined by the following formula, for example.

F ₀ = AVE ₁ + δ ₁ × (AVE ₂ - AVE ₁ )/(δ ₁ + δ ₂ ) = AVE ₂ − δ ₂ × (AVE ₂ - AVE ₁ )/(δ ₁ + δ ₂ ) The present invention utilizes such knowledge. Figure 3 shows an example of a flowchart for determining the presence or absence of peeling of wall tiles, etc. and its depth, using the characteristics shown in Figures 1 and 2. Examples of the present invention will be explained according to this flowchart.

First, input into the computer in advance the impact sound pressure P0 corresponding to the finishing material such as wall tiles, and the judgment reference value regarding 0 repulsion force (Step 1).
S1). Next, the actual striking work is performed, and the sound pressure of the striking sound is measured.
P1 and repulsion force F1 are measured with a sound receiver and a load detector attached to the impact hammer (step S2). Criterion value P0 of impact sound sound pressure and measured impact sound sound pressure
Compare the size of the P1 time series waveform (step
S3), if the measured impact sound sound pressure P1 is smaller than the impact sound sound pressure judgment reference value P0 (NO, that is, P1
<P0), it is determined to be a healthy part (step S4).
If there is separation (YES), the repulsive force judgment reference value F0 and the measured repulsive force time series waveform size F1
The measured repulsion force F1 is compared with (step S5)
is smaller than the repulsion force judgment reference value F0 (NO, that is, F1<F0), it is judged that there is a peeling part (shallow) on the back side of the tile (step S6), otherwise (YES, that is, F0<F1) In this case, it is determined that there is a peeling part (deep) on the skeleton (step S7).

When the series of measurement and determination processes described above are completed, the process returns to the measurement in step S2, and the measurement work for different tile surfaces is repeated one after another.

FIG. 4 is a block diagram showing the equipment configuration of a detection system using the measurement method according to the embodiment of the present invention, which is roughly divided into a striking sound receiving section 1, a hanging section 2,
It is composed of a peeling state analysis section 3.

The striking sound receiving section 1 includes a striking hammer 11, a load detector 12 attached to the striking hammer 11, and a sound receiver 1.
3. It is composed of a wall pressing propeller 14 for pressing the device against the wall A. A wall surface A is struck by a striking hammer 11, and the striking force and sound at that time are detected by a load detector 12 and a sound receiver 13.

The hanging portion 2 includes a striking position detector 21, an operation box 22, and the like. Impact sound receiving section 1
is moved, and the striking position at that time is detected by the striking position detector 21.

The peeling state analysis section 3 is controlled by a control computer 3.
1, impact position measuring device 32, impact signal analyzer 33,
It is composed of a keyboard 34, a printer 35, a CRT 36, a plotter 37, and the like. Impact sound receiving section 1
The impact force signal from the load detector 12 and the impact sound signal from the sound receiver 13 are input to the impact signal analyzer 33 to analyze the peeling state (depth and size). A striking position signal from the striking position detector 21 is input to a striking position measuring device 32 to measure the striking position. Control computer 3
1 controls the entire peeling state analysis unit, and upon receiving the measurement results regarding the adhesion state of tiles etc. and the depth of the peeled part from the blow signal analyzer 33, the blowing position measuring unit 32 controls the blowing state analyzer 32. It is output together with the position to the printer 35, and a wall drawing is created by the plotter 37.

[Summary] As described above, according to the present invention, the state of peeling of wall tiles, etc. can be easily known from the impact sound and the repulsive force from the wall surface.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of the impact sound pressure characteristics of a healthy part and a peeled part, Figure 2 is a diagram showing an example of repulsion force characteristics depending on the peeling position (depth), and Figure 3 is a diagram showing the presence or absence of peeling and its FIG. 4 is a flowchart showing a measuring method according to the present invention for determining depth, and FIG. 4 is a block diagram showing the equipment configuration of a detection system using the measuring method according to the present invention. 1...Blow sound receiving section, 11...Blow hammer, 1
2... Load detector, 13... Sound receiver, 14... Wall pressing propeller, 2... Hanging section, 21... Impact position detector, 22... Operation box, 3... Peeling state analysis section , 31...control computer, 3
2...Blow position measuring device, 33...Blow signal analyzer, 34...Keyboard, 35...Printer, 3
6...CRT, 37...Drawing device.

Claims (1)

[Claims] 1. In order to detect the adhesion state of wall tiles, etc. and measure the depth of the peeled part, the wall is hit with a constant momentum, and the magnitude of the time-series waveform of the impact sound captured by the sound receiver is calculated in advance. The presence or absence of a peeled part is determined by comparing the magnitude of the impact sound with the judgment reference value, and the magnitude of the repulsive force from the wall detected by a load detector attached to the impact hammer is compared with the magnitude of the repulsive force determined in advance. A method for measuring the peeling state of wall tiles, etc., characterized in that the depth of the peeled part is determined by comparing the magnitude of the repulsive force with a judgment reference value.