JPH076933B2 - Exterior peeling detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention determines the peeling state between a concrete wall body and an exterior such as a tile or mortar applied to the wall surface of a building by external knowledge. The present invention relates to a possible method for detecting peeling of an exterior.

[Prior Art] Conventionally, as a method of detecting peeling of the exterior of a concrete wall, it is a kind of infrared sensor method.
The method described in Japanese Patent Publication is known.

That is, in this method, as shown in FIG. 6, a cooling water spray is sprayed between points (a) and (b) on the surface of a concrete wall having surface covering, and at the point (c) during the lowering of the surface mounting temperature. Scan the surface temperature using an infrared thermometer (refer to the temperature curve (III) of the sound part and the temperature curve of the peeling part (IV)) and compare the temperature distribution image obtained with the temperature distribution image of the cover before cooling. The abnormally lowered portion of the temperature is obtained, and the position of the peeling portion of the covering is detected by this.

[Problems to be Solved by the Invention] According to the above-mentioned conventional method, the temperature unevenness of the surface of the mounting surface before cooling in the spray can be removed by subtracting the temperature image before cooling from the temperature image after cooling, Since only the temperature image of the temperature unevenness caused by the non-uniform state of the spray cannot be removed, the temperature unevenness caused by this spray is not affected by the sound part and the peeling part which are generated while the mounting temperature is decreased by the spray. In addition to the extremely small temperature difference (about 0.2 ° C in Fig. 6), it is extremely difficult to distinguish between temperature unevenness due to spraying and temperature unevenness due to peeling, and there is a problem that the peeled part cannot be accurately known. there were.

[Means for Solving the Problems] In order to solve the above problems, the present invention peels off by measuring the temperature of the outer package while artificially rapidly cooling the outer package and then returning to the original temperature. Utilizing the fact that the temperature difference between the part and the sound part is large, and by using image processing, the temperature unevenness of the exterior in the natural state and the cooling temperature unevenness due to the non-uniformity of the spray are removed to accurately separate the peeled state. That is, after cooling the exterior (1) by spraying (12) a cooling liquid (10) mixed with a refrigerant onto the surface of the concrete wall body (2) having the exterior (1), the surface of the exterior (1) is Outer casing for measuring the surface temperature at the time (E) at which a large stable temperature difference is generated between the peeled portion and the sound portion of the outer casing (1) after about 5 minutes have passed after cooling while returning to the temperature before cooling and rising. Peeling detection method, and The cooling liquid (10) mixed with a refrigerant is sprayed (12) on the surface of the cleat wall body (2) to cool the exterior (1), and the surface of the exterior (1) at the time (C) when the cooling is completed. The temperature image and the temperature of the surface at the time (E) at which a stable and large temperature difference is generated between the peeled part and the sound part of the exterior (1) while the surface of the exterior (1) is returning to the temperature before cooling and rising. The means for detecting the peeling of the exterior is provided by determining the difference from the image by image processing and separating the peeled portion and the sound portion.

[Operation] The operation of the present invention will be described with reference to the embodiments.

A nozzle is prepared by pressurizing a cooling liquid (10) in which water is mixed with 50% alcohol to a concrete wall body (2) having an exterior (1) from a cooling liquid tank (8) to several tens of atmospheric pressure by a high pressure pump (9). When sprayed from (7), as shown in Fig. 2, the temperature of the exterior (1) rapidly drops due to the heat of vaporization of alcohol from the time (A) when the exterior (1) is at the same temperature as the outside air temperature (23.0 ° C). Then, at a point (C) after a short time (B) after the end of spraying, the temperature of the outer package (1) drops to 20.4 ° C in a short time (about 40 seconds).

Regarding the state of the exterior part (1) and the sound part at the time of cooling, when looking at the time of cooling, the sound part has the exterior part (1) and the concrete wall body (2) integrated, and is the same as the outside temperature before cooling. The thickness of the concrete wall (2) that is in contact with the temperature is very thick, and the temperature of the surface of the exterior (1) drops to 20.4 ° C in a short time of about 40 seconds, so the surface is cooled. However, since the concrete wall body (2) at the rear of the exterior body (1) still has a temperature substantially equal to the outside air temperature, the large thermal energy of the concrete wall body (2) is exteriorized one after another by heat conduction. It is difficult to cool down because it is replenished in (1), but concrete has a temperature almost equal to the outside air temperature because there is a space between the exterior (1) and the concrete wall (2) in the peeling part. The thermal energy from the wall (2) Since it is not supplied to the outer (1) by conduction is the direction of relatively small thickness of the exterior (1) is cooled quickly.

After that, the temperature of the surface of the exterior (1) gradually rises due to the outside air temperature. Looking at the time when this temperature rises, when the cooling is stopped and the outside air temperature is restored, the exterior part having a relatively thin thickness in the healthy part. In (1), the large thermal energy of the thick concrete wall body (2) that has not yet cooled due to the short-time cooling is directly transferred from the concrete wall body (2) to the exterior (1) one after another. As a result, the temperature of the concrete wall (2) returns to the outside temperature in a short time, while the peeling part has a space between the concrete wall (2) at the rear of the exterior (1) and the thermal energy of the concrete wall (2). The heat is only given to the exterior (1) by radiation, and a large amount of heat energy is not replenished by direct heat conduction. Only the exterior (1) itself emits heat from the outside air. Since it takes a long time to return to the outside air temperature because it is taken in, there is not much difference between the sound part and the peeling part during cooling, but when returning to the outside air temperature after cooling, As shown by the temperature curve I of the sound part and the temperature curve II of the peeling part in Fig. 3, a stable and large temperature difference is generated between the sound part and the peeling part at the time of about 5 minutes after cooling, and the temperature difference is about It becomes 0.8 ° C and the difference becomes remarkable.

In the first invention, the surface temperature is measured at a time point (E) when the temperature difference is stable and large,
In the second invention, the data recorder (16) is provided by the infrared camera (13) at the time points (C) and (E).
After recording a temperature image (FIGS. 3 and 4 and the colors described in these drawings are displayed in order of decreasing temperature in red, orange, yellow, green, and blue),
By obtaining the difference between the two temperature images (FIG. 3 at the time point (C) and FIG. 4 at the time point (E)) by the image processing of the image processing device (17), the exterior (1) is at the outside air temperature (at the time point (time point ( A)) has the temperature unevenness (green portion in FIG. 3) and the temperature unevenness (blue portion in FIG. 3) at the time point (C) caused by non-uniform spraying of the cooling liquid, so that it is shown in FIG. Thus, the difference between the sound portion (orange portion) and the peeling portion (green portion) can be clearly discriminated by the color.

Embodiments Embodiments of the present invention will be described with reference to the drawings.

On a rooftop (3) of a building having a concrete wall body (2) having an exterior (1) on its surface, a trolley (5) which can be driven by wheels (4) is placed, and the trolley (5) moves from the gondola (5). 6) is hung up and down. A nozzle (7) is fixed to the gondola (6), and a cooling liquid (10) pressurized from a cooling liquid tank (8) to several tens of atmospheres by a high pressure pump (9) is attached to an end of the nozzle (7). ) Is connected to the hose (11), and the pressurized cooling liquid is sprayed (12) from the nozzle (7). 30% alcohol as cooling liquid (10)
An aqueous solution mixed with 60% can be appropriately used.
Reference numeral (13) is an infrared camera, which is operated by the controller (15) while looking at the color monitor (14) to scan the wall surface, and the obtained temperature image is the data recorder (16).
Are recorded in the image processing device (1
It is sent to 7) for image processing.

An example of the method of the present invention is as follows.

Tile is applied to a precast concrete slab, and a tile with a thickness of 1 mm is applied to the back surface of several of the tiles to form a release layer, and the tile surface is sprayed with an aqueous solution of 50% alcohol. Then, the time variation of the temperature distribution on the tile surface was measured using an infrared radiation thermometer, and the average temperature of the sound part and the average temperature of the peeled part were calculated based on the obtained data. The result is as shown in FIG. 2. Although there is almost no temperature difference between the surface temperature (I) of the sound part and the surface temperature (II) of the peeling part in the temperature lowering process by spraying the cooling liquid, At about 70 seconds after spraying the liquid (D), there is a clear temperature difference (about 0.8 ° C) between the surface temperature (I) of the sound part and the surface temperature (II) of the peeled part, and
Since the temperature difference gradually increases until the time point (E) after the lapse of seconds, the peeled portion can be accurately detected by measuring the surface temperature at the time point (E).

In addition, as another example, the infrared camera (1
The tile surface is scanned in 3) and the temperature image shown in FIG. 3 is recorded in the data recorder (16). The temperature image shown in FIG. 3 shows temperature unevenness (green part) due to temperature unevenness due to outside air temperature existing before cooling, temperature unevenness (blue part) due to uneven spraying of the cooling liquid, and temperature unevenness due to peeling. (Green part) exists in the form of overlapping.

Next, a temperature image (FIG. 4) at a time point (E) after 300 seconds have passed after spraying the cooling liquid (10) is recorded in the data recorder (16). FIG. 4 is composed of yellow and red because it has risen to a temperature close to the outside air temperature, and the temperature unevenness due to the temperature unevenness existing before cooling that the temperature image of FIG. Since the temperature unevenness due to the nonuniformity and the temperature unevenness due to peeling are present in a form of overlapping, it is not clear which portion is the peeled portion.

Therefore, the image processing apparatus (17) performs the image processing of subtracting the temperature image of FIG. 4 from the temperature image of FIG. 3 to obtain the temperature image of FIG.

FIG. 5 is an image in which the temperature unevenness due to the temperature unevenness existing before cooling and the temperature unevenness due to the non-uniformity of the spray of the cooling liquid are eliminated from the image of FIG. The green portion represents the peeled portion, and the distinction from the healthy portion represented by orange color is clear.

[Effects of the Invention] The first invention can accurately separate the peeled portion because the temperature difference between the sound portion and the peeled portion of the exterior is more remarkable than the conventional method, and the second invention is the cooling. Since the temperature unevenness on the exterior surface before and after cooling can be eliminated, the temperature difference between the sound portion and the peeled portion is remarkable, and the contour of the temperature image can be made clear to separate the peeled portion more accurately.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG.
FIG. 3 is a graph showing a temperature curve used in the present invention.
FIG. 5 is a copy of a temperature image of the exterior surface, and FIG. 6 is a graph showing a temperature curve of the conventional method. (1) …… Exterior, (2) …… Concrete wall, (10)
…… Coolant, (12) …… Spray, (C) …… Cooling completion time, (E) …… A stable and large temperature difference.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Ryujiro Imaizumi, 3-1, 2 Musashino, Akishima-shi, Tokyo Within Nihon Denshi Co., Ltd. (72) In-house, Kaiji Nakayama 3-1-2, Musashino, Akishima-shi, Tokyo JEOL Ltd. (56) Reference JP 61-72169 (JP, A) JP 62-126339 (JP, A) JP 62-157555 (JP, A)

Claims (6)

[Claims] 1. A cooling liquid (10) mixed with a refrigerant is sprayed (1) onto the surface of a concrete wall body (2) having an exterior (1).
2) After cooling the exterior (1), about 5 minutes after cooling in the middle of the surface of the exterior (1) returning to the temperature before cooling and rising, the peeled part and the sound part of the exterior (1) A method for detecting peeling of an exterior, which measures a surface temperature at a time point (E) at which a stable and large temperature difference occurs. 2. The method for detecting peeling of an exterior according to claim 1, wherein the cooling liquid (10) is an aqueous solution of 30% to 60% alcohol. 3. The method for detecting peeling of an exterior according to claim 1, wherein the cooling liquid (10) is sprayed at several tens of atmospheres. 4. A cooling liquid (10) mixed with a refrigerant is sprayed (1) onto the surface of a concrete wall body (2) having an exterior (1).
2) Then, the exterior (1) is cooled, and a temperature image of the surface of the exterior (1) at the time (C) when the cooling is completed, and the surface of the exterior (1) returning to the temperature before cooling and rising. The difference between the temperature image of the surface at the time (E) at which a stable and large temperature difference is generated between the peeling portion and the sound portion of the outer casing (1) is obtained by image processing to separate the peeling portion from the sound portion. Peeling detection method. 5. The method for detecting peeling of an exterior according to claim 4, wherein the cooling liquid (10) is an aqueous solution of 30% to 60% alcohol. 6. The method for detecting peeling of an exterior according to claim 4, wherein the cooling liquid (10) is sprayed at several tens of atmospheric pressure.