JPH11295249A - Wall face inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wall face inspection method in which deterioration on the outer wall of a building can be located accurately while eliminating thermal effect from the inside of the building as much as possible. SOLUTION: The surface temperature distribution image 38a on the outer wall of a building to be inspected is picked up at a first time and the surface temperature distribution image 38b on the outer wall of the building is picked up at a second time when the quantity of solar radiation is different from that at the first time. Based on these two surface temperature distribution images, a presumption is made that the exterior finish material is stripped in a region where the surface temperature and the variation rate thereof is high as compared with other part of the outer wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for investigating a wall surface, and more particularly to a method for investigating a deterioration of a wall surface of a building. About.

[0002]

2. Description of the Related Art Conventionally, there has been a method of investigating a peeling state of a tile, mortar, or the like on a building wall using an infrared imaging apparatus. In this conventional wall surface survey method, first, as shown in FIG. 3, a building 10 to be surveyed is photographed from the outside with an infrared imaging device 12, and a surface temperature distribution image centering on the outer wall of the building 10 is acquired. FIG. 4 is a diagram schematically showing such a surface temperature distribution image. Surface temperature distribution image 1 shown in FIG.
In 4, 16 represents a building outline, and 18 and 20 represent high temperature regions. In the surface temperature distribution image 14, the high-temperature regions 18 and 20 are represented by warmer colors than the surroundings, and are presumed to be caused by deterioration of the building outer wall.

Here, the reason why this estimation can be made will be described with reference to FIGS. FIG. 5 is a cross-sectional view of a normal building outer wall, and the left side in the figure represents the inside of the building. As shown in the figure, the building outer wall 22 is composed of a skeleton concrete 24 and an exterior finishing material 26 such as mortar or tile attached to the surface thereof. When the normal building outer wall 22 is irradiated with sunlight from the outside 28 of the building, the received heat energy is absorbed by the building outer wall 22 or the exterior finishing material 2
6 and propagates in the direction of the building interior 32 as shown by the heat propagation curve 30. As a result, a temperature difference dt0 occurs between the surface of the exterior finishing material 26 and the inner wall surface of the skeleton concrete 24.

FIG. 6 is a cross-sectional view showing the building outer wall 22 when the exterior finishing material 26 has peeled off. The exterior finishing material 26 is attached to the skeleton concrete 24 with an adhesive or the like, but may come off due to deterioration with time or the like. In the figure, the building outer wall 22 is shown centering on the exfoliated portion of the exterior finishing material 26, and the exterior finishing material 2
It can be seen that a gap 34 has been formed between the exterior finishing material 26 and the skeleton concrete 24 due to the peeling of No. 6.

[0005] When the peeling occurs in the exterior finishing material 26 and the gap 34 occurs, the heat transfer from the inner surface of the peeled portion of the exterior finishing material 26 to the skeleton concrete 24 is represented by a heat propagation curve shown in FIG. As shown at 30a, it is significantly impeded. For this reason, the temperature difference dt1 generated between the surface of the exterior finishing material 26 and the inner wall surface of the skeleton concrete 24 when peeling occurs is caused by the difference between the surface of the exterior finishing material 26 on the normal building outer wall 22 and the inner wall of the skeleton concrete 24. It becomes larger than the temperature difference dt0 generated between the surface and the surface.

In the conventional wall surface inspection method, attention is paid to the fact that the heat transfer characteristic differs between the part where the exterior finishing material 26 has peeled off and the normal part other than the above, and the building 10 shown in FIG. Area 1 in the surface temperature distribution image 14
It is presumed that Nos. 8 and 20 are caused by peeling of the exterior finishing material 26.

[0007]

However, the surface temperature of the building outer wall 22 is determined not only by the solar radiation and the peeling of the exterior finishing material 26 but also greatly influenced by the heat-generating equipment installed inside the building. For example, as shown in FIG. 7, when a heating device 36 such as a refrigerator is installed in the building interior 32 in the vicinity of the skeleton concrete 24, heat radiation from the heating device 36 is reduced as shown by a heat propagation curve 30b. Propagation in the direction of the building exterior 28 raises the surface temperature of the exterior finish 26.

For this reason, the peeling position of the exterior finishing material 26 cannot be determined based on the surface temperature distribution image 14 of the building 10 shown in FIG. It was necessary to separately confirm the presence or absence of the heat-generating device, and to take the confirmation details into consideration when determining the peeling position based on the surface temperature distribution image 14.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to eliminate the thermal effects from the inside of a building as much as possible and to accurately specify the deterioration position of the building outer wall. It is to provide a method.

[0010]

In order to solve the above-mentioned problems, a wall surface survey method according to the present invention comprises a first step of obtaining a surface temperature distribution of an outer wall of a building at a first time; A second step of reacquiring the surface temperature distribution of the building outer wall at a second time of solar radiation different from the time, and a surface temperature distribution acquired in the first step and acquired in the second step. A third step of estimating that, in any of the surface temperature distributions, the surface temperature is higher than the surroundings in any of the surface temperature distributions, and that the exterior finish material is peeled in a region where the change is large; and It is characterized by including.

Further, according to one aspect of the present invention, based on the surface temperature distribution obtained in the first step and the surface temperature distribution obtained in the second step, the ambient temperature distribution in any one of the surface temperature distributions The method further includes a step of estimating that a heating device is installed inside the building in a region where the surface temperature is high and the change is small.

That is, in the present invention, a plurality of surface temperature distributions of the building outer wall are acquired under different solar radiation environments. And
Based on the plurality of surface temperature distributions, it is determined that the temperature is higher than the surroundings in any one of the surface temperature distributions, and it is estimated that peeling of the exterior finishing material has occurred in a portion where the amount of change in the temperature is large. .

This estimation is based on the assumption that when the surface of the outer wall of a building is heated to a high temperature by a heating device inside the building, even if the amount of insolation changes, the temperature is hard to change relatively when viewed from the outside. The high temperature of the peeled portion is mainly based on the effect of solar radiation. Thus, according to the present invention, when judging a deteriorated portion of a building outer wall based on the acquired surface temperature distribution, it is possible to accurately identify the position while eliminating as much thermal influence from the inside of the building as possible. .

[0014]

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

FIG. 1 is a view for explaining a wall surface inspection method according to one embodiment of the present invention. In this wall surface survey method, as shown in FIG. 3, the outer wall of the building to be surveyed is photographed a plurality of times from outside using an infrared imaging device at different time zones, and a plurality of surface temperature distribution images of the target building are acquired. . The upper left part of FIG. 1 shows a first surface temperature distribution image 38a which is one of the acquired surface temperature distribution images and is acquired during a time period when a certain amount of solar radiation is present. In addition, the upper right part of the drawing shows a second surface temperature distribution image 38b which is one of the acquired surface temperature distribution images and has no solar radiation, that is, acquired at night. In the first surface temperature distribution image 38a and the second surface temperature distribution image 38b, most of the outer wall 22 of the building is generally represented as a relatively low-temperature portion, and regions having a high temperature as compared with the surroundings are partially scattered. I do. Hereinafter, for the sake of explanation, it is assumed that, in the first surface temperature distribution image 38a, the high-temperature region 42a and the high-temperature region 44a are relatively high temperature regions among the regions included in the building outline 40a. On the other hand, in the second surface temperature distribution image 38b, since the image is obtained by photographing at night, the high-temperature portion is reduced to only the high-temperature region 42b.

According to the wall surface survey method, an image representing the temperature change amount of each part of the building is generated by using these two surface temperature distribution images 38a and 38b or the surface temperature distribution information as the basis thereof. For example, predetermined calculation software may be loaded on a computer, and the temperature change amount in each part of the image may be calculated from the surface temperature distribution information. At the time of these calculations, taking into account differences in the outside air temperature itself, and adding or subtracting a predetermined coefficient to or subtracting from or multiplying or multiplying or subtracting a predetermined coefficient from any of the surface temperature distribution information, a temperature change amount is calculated based on the corrected surface temperature distribution. It may be calculated.

The lower part of FIG. 1 shows a temperature change image showing the temperature change of each part of the building thus generated.
As shown in the figure, in the temperature change amount image 45, the building outline 40a and the like of the building 10 represented by the first surface temperature distribution image 38a and the second surface temperature distribution image 38b become vague. Or disappear. In addition, the high-temperature region 42a that has appeared in the first surface temperature distribution image 38a
The high-temperature region 42b that has appeared in the second surface temperature distribution image 38b becomes vague or disappears in the temperature change amount image 45. On the other hand, the portion that was the high temperature region 44a in the first surface temperature distribution image once disappears in the second surface temperature distribution image 38b, and is represented again as the temperature change region 46 in the temperature change amount image 45.

In the present wall surface survey method, the temperature of the high temperature areas 42a and 42b is increased by a constant heat source based on the surface temperature distribution image 38 and the temperature change amount image 45, that is, a refrigerator or the like installed inside the building. It is presumed that there is a portion where the temperature has risen due to the heat-generating device, and the portion where the surface temperature has changed in response to the change in the amount of solar radiation, that is, the temperature change region 46 is the portion where the exterior finishing material 26 has peeled off. It is estimated that there is. Such estimation is based on the fact that the temperature of the part where the exterior finishing material 26 has peeled becomes relatively high depends on the solar radiation, and the temperature changes sensitively in response to the change in the amount of solar radiation. Is based on the fact that the temperature rise is relatively small even if the amount of solar radiation changes even if the temperature rises due to the heat-generating device 36 installed in the apparatus.

As described above, according to the wall surface survey method, the temperature change amount of each part of the surface of the building to be surveyed is calculated from the two surface temperature information obtained in the environment where the amount of solar radiation is different, so that the inside of the building is calculated. It is possible to identify the deteriorated portion generated on the building outer wall 22 with high accuracy while eliminating the influence of the installed heating equipment.

The above-mentioned wall surface survey method can be implemented in various modifications. For example, in the above-described example, the first surface temperature distribution image 38a and the second surface temperature distribution image 38b are acquired when there is solar radiation (during the day) and when there is no solar radiation (at night). One surface temperature distribution image may be acquired, and the second surface temperature distribution image may be acquired when solar radiation is weak. FIG. 2 is a diagram illustrating a wall surface survey method according to a modification. In this case, unlike the second surface temperature distribution image 38b shown in FIG. 1, the second surface temperature distribution image 48b shown in FIG. 1 has a high temperature region slightly lower than the high temperature region 44a in the first surface temperature distribution image 48a. 50 will be represented.

However, even in this case, by taking the difference between the temperature distribution information that is the basis of the first surface temperature distribution image 48a and the temperature distribution information that is the basis of the second surface temperature distribution image 48b, Alternatively, the temperature change amount image 52
, A temperature change region 54 remains. In some cases, in the temperature change amount image 52, a temperature change region 56 corresponding to the high temperature regions 42a and 42b caused by heat generated from the heat generating device 36 inside the building is also displayed. However, even when such a temperature change area 56 appears in the temperature change amount image 52, it is an area where the temperature change is smaller than the temperature change area 54. Therefore, it is sufficient to determine that the region where the temperature change amount is relatively large is the portion where the peeling has occurred in the exterior finishing material. Thus, the influence of the heat generating device 36 installed inside the building can be eliminated, and the deteriorated portion generated on the building outer wall 22 can be specified with high accuracy.

In the wall surface survey method according to this modification, after the temperature change amount image 52 is acquired, the temperature change area 5
4 so that the difference between the temperature change region 56 and the temperature change region 56 can be easily determined.
Filter processing that emphasizes the difference between the amounts of change may be performed.

In the above description, the change in the surface temperature of the building wall was observed using two surface temperature distribution images. However, the building wall surface was changed using three or more surface temperature distribution images taken at different times. The change in the surface temperature may be observed. In this case, the deterioration position on the wall surface can be determined or estimated with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a wall surface inspection method according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a wall surface survey method according to a modification.

FIG. 3 is a diagram illustrating a conventional wall surface survey method.

FIG. 4 is a diagram illustrating a conventional wall surface survey method.

FIG. 5 is a view for explaining the reason why the temperature of the peeled portion of the exterior finishing material is relatively high.

FIG. 6 is a view for explaining the reason why the temperature of the peeled portion of the exterior finishing material becomes relatively high.

FIG. 7 is a diagram for explaining a problem caused by a conventional wall surface inspection method.

[Explanation of symbols]

38, 48 Surface temperature distribution image, 40 building outline, 4
2,44,50 High temperature area, 45,52 Temperature change amount image, 46,54,56 Temperature change area.

Claims (2)

[Claims] A first step of acquiring a surface temperature distribution of the building outer wall at a first time; and a step of re-calculating the surface temperature distribution of the building outer wall at a second time of an amount of solar radiation different from the first time. A second step of acquiring, and a surface temperature distribution obtained in the first step and a surface temperature distribution obtained in the second step, and a surface temperature distribution in one of the surface temperature distributions as compared with the surroundings. A third step of estimating that the exterior finish is peeled off in a region where the temperature is high and the change is large. 2. The wall surface inspection method according to claim 1, wherein one of the surface temperatures is determined based on a surface temperature distribution obtained in the first step and a surface temperature distribution obtained in the second step. A method for investigating a wall surface, further comprising a step of estimating that a heating device is installed inside a building in a region where the surface temperature is higher than the surroundings in the distribution and the change is small.