Coating material thickness measurement method and coating material application method

Abstract

To provide a method of measuring thickness of a coating material applied to a wall and the like of a building, a coating material thickness measurement system, and a method of applying a coating material.SOLUTION: A coating material thickness measurement method is provided, comprising setting a reference marker (step 1), acquiring a construction shape including three-dimensional coordinates of a surface of a coating material and three or more reference three-dimensional coordinates (step 2), computing a virtual plane within the construction shape (step 3), computing a thickness of the coating material (step 4), and displaying an image of the coating material (step 5).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for measuring the thickness of a coating material applied to a target surface such as a wall or floor of a building by a spraying method or the like, a coating material thickness measurement system, and a coating material application method.

Background Art

[0002] As a method of providing a heat insulating material on a wall or the like of a building, on-site workers use a foaming machine to directly spray a foaming stock solution containing a foaming material as a main raw material onto a target surface such as a wall portion, a floor portion, a roof portion, or a ceiling portion of a building, and then foam and solidify it. However, since the heat insulating effect of the heat insulating material is greatly affected by its thickness, it is required to have a uniform thickness. In particular, in buildings and apartment houses, etc., provision of uniform quality is required, and construction with a thickness error of 0 to 20 mm, and in a severe case, 0 to 5 mm is required. That is, after spraying the foaming material onto the target surface and foaming and solidifying it, its thickness is confirmed, and for the too thick parts, the excess is cut, and for the too thin parts, additional finishing treatment is required. Specifically, at the construction site, while performing the spraying operation, a needle-shaped measuring gauge is inserted into various parts of the foamed and solidified heat insulating material to measure its thickness, and while confirming whether finishing treatment is required for each part. Therefore, the construction work of the heat insulating material has become a very complicated work for workers. Also, depending on the skill level of the workers, the work speed varies greatly, and there are also variations in its quality. Furthermore, reports to the contractor, etc. to ensure the quality of the heat insulating material have been made by checking the construction thickness by inserting a measuring gauge into various parts of the construction site, marking the result (for example, the measured value of the thickness) on the surface of the heat insulating material (wall), and presenting a photo of a part of the surface. Repeatedly inserting the measuring gauge in this way may also cause physical damage to the heat insulating material, and only scattered measured values can be obtained, and sufficient quality control could not be achieved.

[0003] Patent Document 1 discloses a method and a robot equipped with a spraying nozzle connected to a source of foaming material and a sensing device configured to monitor the thickness of its coating. In the method of this Patent Document 1, the finishing process can be reduced by controlling the spraying amount of the foaming material while monitoring the spraying thickness with a laser distance meter. Patent Document 2 discloses a remotely operable robotic arm having a spray nozzle and a rangefinder at its tip. In this robotic arm, it is described that the rangefinder can measure the material (object) before and after coating and calculate the thickness to be filled.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the method of Patent Document 1 is premised on the use of a robot, but the use of a robot is not always advantageous in a messy work site. On the other hand, it is also conceivable that the method of Patent Document 1 is performed by an operator. However, since the thickness is controlled by the spraying operation of the foaming material while monitoring the thickness with a laser distance meter instead of a measuring gauge at any time, it is inevitable that the spraying operation and the confirmation of the thickness (confirmation of the monitoring) are performed alternately, and the work is complicated. For example, human errors such as misreading the monitor are likely to occur. Also, Patent Document 2 does not measure the entire material (object surface) to be coated, but measures a part of the material (object surface) to be coated at any time, and has the same problem as Patent Document 1. An object of the present invention is to provide a method for measuring the thickness of a covering material applied to a target surface such as a wall of a building, a system for measuring the thickness of the covering material, and a method for applying the covering material.

Means for Solving the Problems

[0006] The present invention is a method for measuring the thickness of a covering material applied to a target surface, the method comprising: a step of obtaining a construction shape including three-dimensional coordinates of the surface of the covering material, three-dimensional coordinates of three or more equidistant points at which the distances from the target surface are equal, and reference three-dimensional coordinates of one or more reference points at which the distances from the target surface are known; and a step of calculating the thickness of the covering material based on the three-dimensional coordinates of the surface of the covering material, the three-dimensional coordinates of the equidistant points, and the reference three-dimensional coordinates. In the present invention, the "thickness of the covering material" refers to the length in a direction perpendicular to the target surface. The "three-dimensional coordinates of the surface of the covering material" refer to the three-dimensional coordinates on the surface of the covering material exposed on the space side opposite to the target surface. For example, a set of three-dimensional coordinates of a plurality of points on the surface of the covering material can be mentioned. Further, the "distance from the target surface" refers to the length of a perpendicular dropped from that point to the target surface. The method of expressing the three-dimensional coordinates is not particularly limited as long as it can be processed on a computer. For example, it may be expressed as a set of coordinate values (so-called point cloud data) in a three-dimensional orthogonal coordinate system of (X, Y, Z), or may be a polygon mesh, a mathematical formula or parameter expression of a plane / surface, or a volume data expression (voxel, etc.), and combinations thereof.

[0007] Since the method for measuring the thickness of the covering material of the present invention obtains a construction shape including three-dimensional coordinates of the surface of the covering material, three-dimensional coordinates of three or more equidistant points at which the distances from the target surface are equal, and reference three-dimensional coordinates of one or more reference points at which the distances from the target surface are known, a virtual point having the same plane coordinates (plane coordinates parallel to the target surface) as a predetermined point of the covering material and the same distance from the target surface as the reference three-dimensional coordinates is obtained, and the thickness of the predetermined point of the covering material can be calculated by comparing the predetermined point of the covering material with the virtual point at which the distance from the target surface is known.

[0008] A method for measuring the thickness of the coating material of the present invention, wherein the distance from the target surface of the equidistant points is known, and it is preferable that the equidistant points are also the reference points. Further, it is more preferable to further include a step of calculating a virtual plane based on the three-dimensional coordinates of the obtained equidistant points, and calculating the thickness of the coating material based on the three-dimensional coordinates of the surface of the coating material and the virtual plane. Alternatively, a method for measuring the thickness of the coating material of the present invention, wherein the distance from the target surface of the equidistant points is unknown, and it is preferable that the reference point is a point different from the equidistant points. Further, it is more preferable to further include a step of calculating a virtual plane based on the three-dimensional coordinates of the obtained equidistant points and the reference three-dimensional coordinates, and calculating the thickness of the coating material based on the three-dimensional coordinates of the surface of the coating material and the virtual plane. Note that the "virtual plane" refers to a plane parallel to the target surface with a known distance from the target surface, and it is preferably one that includes the reference three-dimensional coordinates, but it may not include them. When calculating the thickness of the coating material based on the virtual plane in this way, the thickness of the coating material can be calculated by calculating the distance between the virtual plane and the surface of the coating material. In particular, when the virtual plane includes at least a plane obtained by translating the target surface in a direction perpendicular to the target surface, the thickness of the entire coating material can be calculated by a single calculation. Since the thickness of the entire coating material can be calculated by a single measurement after the coating material is applied in this way, it is preferable.

[0009] A method for measuring the thickness of the coating material of the present invention, which includes a step of installing a reference marker on or near the coating material before the step of obtaining the construction shape, and it is preferable that the reference three-dimensional coordinates are the three-dimensional coordinates on the reference marker. In this case, it is preferable to install three or more reference markers and set at least one reference three-dimensional coordinate for each reference marker, so that three or more reference three-dimensional coordinates with equal distances from the target surface can be obtained. Further, it is preferable that the reference marker has a pin extending in one direction, and the step of installing the reference marker is a step of inserting the pin into the coating material so that the tip of the pin abuts against the target surface.

[0010] A method for measuring the thickness of a coating material according to the present invention, wherein the equidistant points are preferably points on the surface of the coating material and a structure adjacent to or in the vicinity of the target surface. Here, the "structure" is a structure including a plane parallel to the target surface, and the "surface of the structure" means a plane including a plane whose distance from the target surface is known and is parallel to the target surface. For example, it is the surface of a wall flush with the wall surface as the target surface, or a column or beam built in parallel to the wall surface as the target surface. Also in this case, the thickness of the coating material can be easily calculated. In particular, when the distance between the plane parallel to the target surface of the structure and the target surface can be accurately grasped from the design drawing, the equidistant points on the surface of the structure are known in distance from the target surface and can be used as reference points at the same time as the equidistant points. Therefore, there is no need to install a reference marker, and human errors during the installation of the reference marker can be reduced. When the distance between the plane parallel to the target surface of the structure and the target surface is unknown, one or more reference markers are provided on or near the coating material, and based on three or more equidistant points on the surface of the structure and the reference three-dimensional coordinates on the reference marker, the thickness of the coating material can be calculated.

[0011] A method for measuring the thickness of a coating material according to the present invention preferably includes a step of displaying a coating material image showing the thickness distribution of the coating material in color or shading. The coating material image showing the thickness distribution in color or shading in this way can immediately confirm the defective construction parts, enabling the work to be speeded up. Also, it is preferable as data of the coating material for quality control because it is easy to view.

[0012] A method for measuring the thickness of a coating material according to the present invention preferably includes a step of determining the presence or absence of defective construction parts where the thickness of the coating material is outside a predetermined range. In particular, it preferably includes a step of displaying the defective construction parts in the coating material image. If the defective construction parts are thus known, it is easy to identify the finishing process of the coating material. In particular, the defective construction determination image also improves workability.

[0013] A method for measuring the thickness of a coating material of the present invention preferably includes a step of storing the thickness of the coating material in association with the target surface. In particular, it preferably includes a step of storing a coating material image in association with the target surface. Note that before applying the coating material, it is preferable to have a step of measuring the moisture content of the target surface and a step of storing the moisture content in association with the thickness of the coating material. Alternatively, before applying the coating material, it is preferable to have a step of measuring the temperature distribution of the target surface and a step of storing the temperature distribution in association with the thickness of the coating material. Further, the coating material is a sprayable rigid urethane foam heat insulating material, and it is preferable to have a step of obtaining the spraying conditions of the coating material and a step of storing the spraying conditions in association with the thickness of the coating material. By storing the thickness of the coating material in association with various data in this way, it is easy to manage as coating material data. For example, when there are many target surfaces such as in a building or an apartment house, it is easy to manage. In particular, by storing the thickness of the coating material in association with the moisture content, temperature distribution, and / or spraying conditions of the target surface, it is more preferable for quality control as coating material data.

[0014] A thickness measurement system for a coating material of the present invention is a system for measuring the thickness of a coating material applied to a target surface, and includes a three-dimensional measurement device and a data processing unit. The three-dimensional measurement device obtains a construction shape including the three-dimensional coordinates of the surface of the coating material, the three-dimensional coordinates of three or more equidistant points having the same distance from the target surface, and the reference three-dimensional coordinates of one or more reference points having a known distance from the target surface. The data processing unit is characterized by calculating the thickness of the coating material based on the construction shape. By using this measurement system, the thickness of the coating material can be accurately measured in a single measurement.

[0015] A thickness measurement system for a coating material of the present invention, wherein the distance from the target surface of the equidistant points is known, and it is preferable that the equidistant points are also the reference points. Alternatively, a thickness measurement system for a coating material of the present invention, wherein the distance from the target surface of the equidistant points is unknown, and it is preferable that the reference point is a point different from the equidistant points.

[0016] A thickness measurement system for a coating material of the present invention, further comprising a reference marker installed on or near the coating material, and it is preferable that the data processing unit recognizes the reference marker based on characteristics of color or shape from the construction shape. By automatically recognizing the reference marker from the construction shape in this way and at the same time recognizing the three-dimensional coordinates on the reference marker as the reference three-dimensional coordinates, the recognition of the reference marker can be made accurate and rapid.

[0017] A second aspect of the thickness measurement system for a coating material of the present invention is a system for measuring the thickness of a coating material applied to a target surface, comprising a three-dimensional measurement device, a data processing unit, and a display unit worn by a user and provided in front of the user's eyes. The data processing unit calculates the thickness of the coating material based on the three-dimensional coordinates of the surface of the coating material acquired by the three-dimensional measurement device, the three-dimensional coordinates of three or more equidistant points having the same distance from the target surface, and the reference three-dimensional coordinates of one or more reference points whose distance from the target surface is known, calculates a coating material image showing the distribution of the thickness of the coating material, and overlaps and displays the coating material image on the coating material within the user's visual field on the display unit. In the second aspect of the thickness measurement system for a coating material of the present invention, it is preferable that the distance from the target surface of the equidistant points is known, and the equidistant points are also the reference points. Alternatively, in the second aspect of the thickness measurement system for a coating material of the present invention, it is preferable that the distance from the target surface of the equidistant points is unknown, and the reference point is a point different from the equidistant points. In a second aspect of the coating thickness measurement system of the present invention, by the user wearing a device equipped with a display unit, the user can confirm the thickness of the coating material on-site. Therefore, the finishing work time can be shortened.

[0018] In such a three-dimensional shape measurement system of a coating material, it is preferable to include an image acquisition unit that photographs the viewing direction of the user's eyes, and to overlap the coating material image on the surface of the coating material in the image photographed by the image acquisition unit. Furthermore, it is more preferable to integrally configure the three-dimensional measurement device, the display unit, and the data processing unit, and to form a wearable computer system that can be worn by the user. For example, a head-mounted device such as a head-mounted display (HMD) or smart glasses may be used. Thereby, the finishing work after construction can be carried out while confirming it in real time. Thereby, even when the skill level of the operator is low, there is no failure or rework in the construction, and the coating material can be applied to a uniform thickness. In addition, the thickness check work after construction, which was previously required to be repeated every time of finishing work, is no longer necessary.

[0019] The coating application method of the present invention is a method for applying a coating material to a target surface, and includes a step of applying the coating material to the target surface, a step of acquiring the three-dimensional coordinates of the surface of the coating material, the three-dimensional coordinates of three or more equidistant points where the distance from the target surface is equal, and the reference three-dimensional coordinates of one or more reference points where the distance from the target surface is known, and a step of calculating the thickness of the coating material based on the three-dimensional coordinates of the surface of the coating material, the three-dimensional coordinates of the equidistant points, and the reference three-dimensional coordinates, and a step of determining the presence or absence of a defective construction portion where the thickness of the coating material deviates from a predetermined range. In the coating application method of the present invention, it is preferable that the distance from the target surface of the equidistant points is known and the equidistant points are also the reference points. Alternatively, in the coating application method of the present invention, it is preferable that the distance from the target surface of the equidistant points is unknown and the reference points are different from the equidistant points. Since the method for applying the coating material of the present invention uses the method for measuring the thickness of the present invention, defective application sites can be visually confirmed, and a coating material of uniform quality can be provided regardless of the skill level of the operator.

Advantages of the Invention

[0020] According to the present invention, on-site workers can grasp the thickness of the applied coating material with a single measurement. Therefore, finishing treatment of defective application sites can be easily performed. Furthermore, objective data on the quality of the coating material can be retained.

Brief Description of the Drawings

[0021]

Figure 1

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Best Mode for Carrying Out the Invention

[0022] Next, with reference to the flowchart of FIG. 1, a first embodiment of a method for measuring the thickness of a coating material applied to a target surface (hereinafter referred to as the thickness measurement method) will be described. In this embodiment, the thickness of the coating material is calculated based on three-dimensional coordinates of three or more points where the distances from the target surface are known and equal. These three or more points are equidistant points where the distances from the target surface are equal, and at the same time, they are reference points where the distances from the target surface are known.

[0023] First, the coating material to be measured by the thickness measurement method of the embodiment is coated by an operator or the like by applying it to the target surface at the site. Examples of the target surface (construction surface) include building walls, floors, roofs, ceilings, rooftops, etc., and it is particularly useful for difficult-to-measure parts such as roofs and ceilings.

[0024] Examples of the coating material include heat insulating materials, fire resistant materials, waterproof materials, general building materials (FRP, FRC, FRG), etc. Examples of the heat insulating material include soft or hard urethane foam, rock wool, cellulose fiber, etc. In particular, on-site foamed rigid urethane foam (for example, rigid urethane foam defined in JISA9526) constructed by the spraying method is preferable. Sprayed urethane foam with a high reaction rate using potassium octylate or lead octylate is difficult for even a skilled person to construct with a uniform thickness (about 10 to 200 mm) because the foaming stock solution sprayed on the target surface expands irregularly at a foaming ratio of about 20 to 120 times, and the construction thickness directly affects the heat insulation performance. On the other hand, examples of the waterproof material include urethane-based, FRP-based, acrylic rubber-based, acrylic resin, etc.

[0025] Examples of the construction method include spraying or coating. In particular, the coating material constructed by spraying is suitable for the thickness measurement method of the present invention because it is difficult to make the thickness after construction uniform compared to coating.

[0026] Next, the process will be described. As shown in the flowchart of FIG. 1, the thickness measurement method includes a step of installing a reference marker (first step), a step of obtaining a construction shape including the three-dimensional coordinates of the surface of the coating material and the reference three-dimensional coordinates of three or more reference points (second step), a step of calculating a virtual plane (third step), a step of calculating the thickness of the coating material (fourth step), a step of displaying an image of the coating material (fifth step), a step of determining whether finishing processing is necessary based on the image of the coating material (sixth step), a step of performing finishing processing if it is determined that finishing processing is necessary (seventh step), and a step of associating and storing the three-dimensional data of the coating material with the target surface if it is determined that finishing processing is not necessary (eighth step).

[0027] In the first step, a reference marker is installed on the coating material. Specifically, the reference marker is installed at a position on the coating material that is separated from the target surface by a predetermined distance. For example, in FIGS. 2a and 2b, reference numeral 11 denotes a wall (target surface), reference numeral 12 denotes a coating material, and reference numeral 13 denotes a disc-shaped reference marker. This reference marker provides a reference point and its reference three-dimensional coordinates that serve as a reference when calculating the virtual plane in the third step. Hereinafter, the distance between the target surface and the reference point may be referred to as the "reference distance".

[0028] The reference marker 13 is provided, for example, on the head of the pin 13a as shown in FIG. 2b. Then, the pin 13a is inserted into the coating material 12 so that the pin 13a is perpendicular to the target surface (so that the plane of the head of the pin 13a is parallel to the target surface), and the tip of the pin 13a is brought into contact with the target surface, whereby the reference marker 13 can be provided on the coating material 12. Let the distance from the reference marker 13 to the wall 11 at this time be L (the length of the pin + the thickness of the reference marker 13). That is, the length of the perpendicular dropped from the reference marker 13 to the target surface is the distance L, and any point on the reference marker can be used as the reference three-dimensional coordinates. The length of the pin 13a is substantially the same as or slightly larger than the planned thickness of the coating material 12. Thereby, the reference marker 13 is not buried in the coating material 12 that has been constructed to the planned thickness.

[0029] In FIG. 2, four reference markers 13 are provided, and at least one reference three-dimensional coordinate is set for each reference marker. In order to estimate the virtual plane, it is preferable to provide three or more reference markers. However, by setting a plurality of reference three-dimensional coordinates for one reference marker, one or two reference markers may be used. It can be appropriately determined according to the required accuracy. When providing a plurality of reference markers, all the reference markers are installed so that the distances from the target surface are the same. As the reference marker 13, a disc-shaped one is exemplified, but a sphere, a cube, a flat plate of a polygon such as a triangle or a square, etc. can be exemplified. The shape of the reference marker 13 is not particularly limited, but it is preferable because it has geometric features as listed above and is easy to automatically recognize by image processing. Also, it is preferable to use a reference marker of a predetermined color. For example, if the head of the reference marker is made into a predetermined color that is easy to distinguish with a coating material such as red, blue, or green as the background, it becomes easy to automatically recognize the reference marker based on the color feature. When using a flat plate, it is important to make the flat plate parallel to the target surface when installed. Also, the pin 13a that supports the reference marker 13 is not particularly limited. For example, the reference marker may be supported by three or more pins. In this case, by piercing the coating material 12 so that the tips of the three pins are in contact with the target surface (wall 11), the three pins 13a can be made perpendicular to the target surface, and the operator can easily install the reference marker at a predetermined distance from the target surface.

[0030] The second step is to obtain a construction shape including the three-dimensional coordinates of the surface of the coating material and the reference three-dimensional coordinates of three or more reference points whose distances from the target surface are known and substantially the same. Specifically, a construction shape including the three-dimensional coordinates of the surface of the coating material 12 and the three-dimensional coordinates of the surface of the reference marker 13 is obtained. For example, the construction shapes 10 in FIGS. 2a and 2b include the three-dimensional coordinates of the coating material 12 and the three-dimensional coordinates (reference three-dimensional coordinates) of the surfaces of the four reference markers 13. "Acquisition of the construction shape" means, for example, acquiring the three-dimensional shape of the target surface by a set of three-dimensional coordinates. For example, the point cloud data obtained by scanning the target surface with a three-dimensional measuring device or the like can be mentioned.

[0031] As the three-dimensional measuring device, it is acquired by a three-dimensional measuring device such as a three-dimensional scanner or a stereo camera. The three-dimensional scanner projects laser light onto the target surface and calculates the three-dimensional shape of the target surface from the reflected light (so-called LIDAR method), or measures the distance by the time until the irradiated light is reflected and returned (TOF method), etc. On the other hand, the stereo camera calculates the three-dimensional shape from the images of the target surface captured by two cameras based on the principle of triangulation. There are also methods such as projecting a measurement pattern with a separate projector to improve the matching accuracy of the two camera images, or replacing one of the two cameras with a projector that projects pattern light (so-called active stereo method). An appropriate device may be selected considering the measurement accuracy, measurement speed, and cost. However, since the floor plan of a certain indoor area with a target surface varies depending on the building, a three-dimensional scanner using the LIDAR method with relatively stable accuracy is preferred. On the other hand, considering the complexity of installing the scanner on-site, a handy scanner using the active stereo method that can image a wide target surface at once is preferred. Also, it is preferable that the color information of the target is included in the construction shape. For example, when a color camera is used for three-dimensional measurement, a color image can be acquired simultaneously with the three-dimensional coordinates, and point cloud data with added color information can be generated. Based on the color information of the construction shape, a reference marker or a coating material area can be recognized.

[0032] The third step is to calculate a virtual plane. Specifically, based on the reference marker 13 (reference three-dimensional coordinates), a virtual plane S obtained by translating the target surface parallel by a predetermined distance in the direction perpendicular to the target surface is calculated within the construction shape. Note that the target surface may be calculated based on the reference three-dimensional coordinates.

[0033] Figure 2c shows the constructed shape 10a with the virtual plane S calculated. The method for calculating the virtual plane S uses four reference markers 13 that are at a predetermined distance from the target surface (wall 11). Specifically, first, four reference markers are recognized from within the constructed shape based on color and shape features. For example, when using a red reference marker, the red area can be recognized as the reference marker from the constructed shape. Such recognition may be done manually by an operator indicating the position of the reference marker on the screen, or it may be automatically recognized by the computer's processing unit. Next, three or more reference three-dimensional coordinates are extracted from the four recognized reference markers. For example, the centroid coordinates of each reference marker may be used as the reference three-dimensional coordinates. It is not necessarily required to use all four reference markers, and multiple reference three-dimensional coordinates may be extracted from a single reference marker. Next, a plane S1 is estimated based on the three or more extracted reference three-dimensional coordinates. At this time, due to the measurement error of the three-dimensional measuring device and the influence of the inclination of the reference marker with respect to the target surface, etc., it is expected that each reference three-dimensional coordinate will not exactly lie on the same plane. Therefore, a plane may be fitted to the multiple reference three-dimensional coordinates. Known methods can be used for this. For example, a least-squares plane may be obtained for the multiple reference three-dimensional coordinates using the least-squares method. This plane S1 is parallel to the wall 11 and is separated by a predetermined distance L. The virtual plane S is calculated by expanding this plane S1 to the position and size after being translated parallel by a predetermined distance in the direction perpendicular to the target surface with respect to the target surface. The virtual plane S may be calculated at a position separated from the target surface by a predetermined reference thickness. At this time, if the covering material is constructed according to the reference thickness, the surface of the covering material will coincide with the virtual plane S.

[0034] The fourth step is to calculate the thickness of the covering material. Specifically, in the constructed shape where the virtual plane is calculated, the thickness of the covering material is calculated based on the three-dimensional coordinates of the surface of the covering material and the virtual plane calculated based on the reference three-dimensional coordinates. Specifically, the distance between the point on the surface of the covering material that intersects the perpendicular line to the target surface and the point on the virtual plane is calculated, and the thickness of the point on the surface of the covering material is calculated in consideration of the distance L of the virtual plane from the target surface. That is, as shown in FIG. 2c, the distance between the point C1 on the surface of the covering material that intersects the perpendicular line V1 to the target surface and the point T1 on the corresponding virtual plane is Z1. When the point C1 is covered by the virtual plane S, the thickness of the point C1 of the covering material is L - Z1. On the other hand, the distance between the point C2 on the surface of the covering material that intersects the perpendicular line to the target surface and the point T2 on the corresponding virtual plane is Z2. When the point C2 protrudes from the virtual plane S, the thickness of the point C2 of the covering material is L + Z2 (not shown). The thickness in the entire region of the covering material can be calculated in this way. Such calculations may be obtained by subtracting the point group coordinates of the surface of the covering material and the point group coordinates of the virtual surface, or may be calculated by converting the point group into a mesh and calculating the difference by calculating between surfaces.

[0035] The fifth step is to display the covering material image. Specifically, an image showing the surface of the covering material is calculated and displayed, which is a covering material image showing the thickness distribution of the covering material in color or shading. Examples of the image showing the surface of the covering material include a perspective image expressed three-dimensionally and a two-dimensional image obtained by projecting the construction shape onto a predetermined plane (for example, a plane parallel to the target surface).

[0036] The sixth step determines whether finishing treatment is necessary based on the coating material image. Specifically, based on the coating material image, check whether there are any construction defect areas where the thickness of the coating material is outside the specified range. If there are construction defect areas, it is determined that finishing treatment is necessary; if there are no construction defect areas, it is determined that finishing treatment is unnecessary. Also, calculate how much thicker or thinner the part of the coating material is from the specified reference thickness, and determine whether the thickness is within the specified range. When the coating material is a heat-insulating material, as an example of its construction standard, the range is -0 mm to +20 mm with respect to a reference thickness of 30 mm (parts thinner than the reference are defective, and parts thicker than the reference are acceptable up to 20 mm). It can also be set to a more stringent range of -0 mm to +5 mm. For example, in the coating material image of the fifth step, construction defect areas may be indicated in color or shading (construction defect determination image). Also, for example, in the coating material image, the part can be specified with a lead line, and the numerical value indicating how much it deviates from the specified value can be shown. By specifying the construction defect areas in this way and clarifying the degree of defect, it is easier to perform the finishing treatment in the seventh step. If it is determined that finishing treatment is necessary, proceed to the seventh step; if it is determined that finishing treatment is unnecessary, proceed to the eighth step.

[0037] The seventh step performs finishing treatment if it is determined that finishing treatment is necessary. That is, when it is determined in the sixth step that finishing treatment is necessary, perform finishing treatment on the parts where finishing treatment is necessary so that the thickness of the coating material is within the specified range. Specifically, cut off the excess for parts thicker than the specified range, and spray or apply additional material for parts thinner than the specified range. After performing the finishing treatment, return to the second step and obtain the construction shape. After that, in the sixth step, repeat the second step to the seventh step until finishing treatment is unnecessary.

[0038] In the eighth step, when it is determined that no finishing process is required, the three-dimensional shape of the surface of the coating material and the thickness of the coating material, particularly the coating material image, are stored as a database in association with the target surface. That is, in the sixth step, when it is determined that no finishing process is required, the application of the coating material is completed and the data is saved. For example, by associating and storing the position information and identification information of the target surface, such as the east wall of Room 102, with the coating material image, it can be used as the data of the database managed for each target surface (wall). Also, when there is 3D CAD data of the building, it is preferably stored in association with the 3D CAD data. In particular, by storing it in association with BIM (Building Information Modeling) advocated in recent years, more efficient process management and quality management are possible. Especially when there are many target surfaces, such as in buildings and apartment houses, it is easy to manage. Note that the three-dimensional shape before finishing may also be saved together. Thereby, the process of the work can be traced. These data are preferably saved, for example, as an electronic file with security set by a password and not editable. In particular, it is preferably an electronic file with a time stamp for non-forgery proof and time proof. By making it an electronic file that cannot be edited in this way, the objectivity of the data can be maintained.

[0039] As described above, in the method for measuring the thickness of the coating material of this embodiment, a virtual plane obtained by translating the target surface parallel by a predetermined distance in the direction perpendicular to the target surface based on the reference three-dimensional coordinates is calculated within the construction shape, and the thickness of the coating material is calculated from the surface of the coating material and the virtual plane. Therefore, without measuring the thickness of the coating material while piercing a pin or the like, after the application of the coating material, the thickness of the entire coating material can be known by one measurement. Also, the finishing process of the coating material is simple. In particular, by using the coating material image, it becomes easy to identify the location of the finishing process. The method for applying the coating material using this thickness measurement method can provide a coating material of uniform quality regardless of the skill level of the operator.

[0040] The method for measuring the thickness of the coating material in the first embodiment using the reference marker is not limited to the above. For example, in the step of installing the reference marker (the first step), although the reference marker is installed on the coating material, the reference marker may be installed near the coating material. For example, the reference marker may be installed on a column around the coating material. Where to install the reference marker can be appropriately determined according to the target surface. Also, in the step of creating the coating material image (the fifth step), although a coating material image indicating thickness by color or shading is mentioned, it may be a projection image or a three-dimensional image (perspective image) of the coating material without providing color or shading according to thickness. Also, in the fifth step, instead of only displaying the image, a table associating the position data on the target surface and the thickness data of the coating material may be displayed.

[0041] In addition, before applying the coating material, the moisture content of the target surface may be measured and the moisture content may be stored in association with the thickness of the coating material, particularly the coating material image. Since water is contained in the foaming agent of rigid urethane foam, if the target surface (wall surface) contains a lot of moisture, the balance of the reaction may be disrupted and the quality as a heat insulating material may deteriorate. Therefore, by storing the moisture content of the wall surface before construction together with the data of the heat insulating material, a more detailed database can be constructed. For measuring the moisture content, an existing high-frequency moisture meter such as "HI-520-2" manufactured by Kett Science Laboratory Co., Ltd. can be used. Also, before applying the coating material, the temperature distribution of the target surface may be measured using a thermal camera or the like, and the temperature distribution may be stored in association with the three-dimensional shape of the surface of the coating material and the thickness of the coating material, particularly the coating material image. Since the temperature of the spraying surface of rigid urethane foam may affect the quality, it is preferable to store the relationship between the temperature distribution and the thickness from the viewpoint of quality control. At this time, the two-dimensional temperature image obtained by the thermal camera may be mapped to the three-dimensional shape of the surface of the coating material based on the reference marker or the structure. Furthermore, during the application of the coating material, spraying conditions (in the case of two-component rigid urethane foam, the mixing pressure and mixing temperature of the two components) may be continuously acquired, and the spraying conditions may be stored in association with the three-dimensional shape of the surface of the coating material and the thickness of the coating material, particularly, the coating material image. Since the quality of rigid urethane foam varies greatly depending on the spraying conditions, it is preferable for quality control to store the spraying conditions before construction together with the three-dimensional data of the heat insulation material, and a detailed database can be constructed. In addition, environmental information (temperature, humidity, etc.) in the room during construction may be acquired, and the environmental information may be stored in association with the three-dimensional shape of the surface of the coating material and the thickness of the coating material, particularly, the coating material image.

[0042] Next, with reference to the flowchart of FIG. 3, a second embodiment of the thickness measurement method will be described. This embodiment is performed without installing a reference marker. As shown in the flowchart of FIG. 3, it includes a step of acquiring a construction shape (first A step), a step of calculating a virtual plane (second A step), a step of calculating the thickness of the coating material (third A step), a step of displaying a coating material image (fourth A step), a step of determining whether finishing processing is necessary based on the coating material image (fifth A step), a step of performing finishing processing if it is determined that finishing processing is necessary (sixth A step), and a step of storing the three-dimensional data of the coating material in association with the target surface if it is determined that finishing processing is not necessary (seventh A step). It should be noted that the third A step to the seventh A step are substantially the same as the fourth step to the eighth step of the embodiment of FIG. 1.

[0043] The first A step acquires a construction shape. In this embodiment, the construction shape includes the three-dimensional coordinates of the surface of the structure located adjacent to or in the vicinity of the coating material and the target surface. Here, the structure includes a surface parallel to the target surface. And the surface of the structure refers to the one including the surface parallel to the target surface. Examples of structures include columns, sashes, thresholds, baseboards, moldings, beams, etc. located in the same room as the wall surface of the target surface, or openings such as floors, ceilings, wall boundaries, pipes, doors, windows, ventilation openings, and structures having the characteristic shape of a distribution box. In the case of waterproof construction of a parking lot floor, rising parts such as parapets and structures such as columns can be used as reference points. For example, the construction shape 10 in FIG. 4 includes a covering material 12 and a column P having a plane S2 parallel to the target surface.

[0044] In the second A step, a virtual plane is calculated. Specifically, the three-dimensional coordinates of any three points on the plane parallel to the target surface of the structure are acquired and used as the reference three-dimensional coordinates. Here, three points (not shown) are selected from the plane S2 of the column P and used as the reference three-dimensional coordinates. It is assumed that the plane S2 is known and the distance L from the target surface is known from the dimensions of the column P. Based on the reference three-dimensional coordinates on S2, a virtual plane S obtained by translating the target surface parallel by a predetermined distance in the direction perpendicular to the target surface is calculated within the construction shape. The dotted line in FIG. 4 is the virtual plane S. That is, in the structure (column P), the virtual plane S is calculated within the construction shape by expanding the plane S2 parallel to the target surface to the same size as the target surface and translating it in the plane direction. When the construction shape is represented by polygon meshes instead of point cloud data, instead of acquiring the three reference three-dimensional coordinates, one plane parallel to the target surface may be selected, but ultimately this is equivalent to selecting the three reference three-dimensional coordinates that define the selected plane.

[0045] Also in the thickness measurement method of this second embodiment, similar to the first embodiment, since a virtual plane obtained by translating the target surface parallel by a predetermined distance in the direction perpendicular to the target surface can be calculated within the construction shape, after the covering material is constructed, the thickness of the entire covering material can be confirmed by one measurement. The construction method of the covering material using this thickness measurement method can also provide a covering material of uniform quality regardless of the skill level of the operator, similar to the first embodiment.

[0046] Next, a third embodiment of the thickness measurement method of the covering material will be described. In the first and second embodiments of the thickness measurement method, a virtual plane was calculated based on three or more three-dimensional reference coordinates with known and equal distances from the target surface. These points were equidistant points with equal distances from the target surface and were also reference points with known distances from the target surface. In this embodiment, a virtual plane is calculated based on the three-dimensional coordinates of three or more equidistant points with equal but unknown distances from the target surface and the reference three-dimensional coordinates of one or more reference points with known distances from the target surface. The flowchart of this embodiment is shown in FIG. 9. The fourth to eighth B steps are substantially the same as the fourth to eighth steps in FIG. 1.

[0047] In the first B step, a reference marker is installed on the coating material. The same reference marker as in the first embodiment can be used. However, only one reference marker needs to be installed, and it is sufficient if one reference three-dimensional coordinate is set on the reference marker.

[0048] In the second B step, the construction shape is acquired. In this embodiment, the construction shape includes the three-dimensional coordinates of the surface of the coating material and the structure located adjacent to or in the vicinity of the target surface, and the reference three-dimensional coordinates set on the reference marker. Similar to the second embodiment, here the structure includes a plane parallel to the target surface, and the surface of the structure refers to that plane parallel to the target surface. Examples of the structure are also the same as in the second embodiment. For example, the construction shape 10b in FIG. 10 includes the coating material 12, one reference marker 13, and a column P having a plane S2 parallel to the target surface.

[0049] In the third B step, a virtual plane is calculated. Specifically, any three points on the plane parallel to the target surface of the structure are taken as equidistant points, and their three-dimensional coordinates are acquired. In FIG. 10, three points (not shown) are selected as equidistant points from the plane S2 of the column P. A plane parallel to the target surface is calculated based on the three-dimensional coordinates of the equidistant points on S2, and the plane is translated parallel until the reference point on the reference marker 13 lies on the plane, and the virtual plane S is calculated within the construction shape. The virtual plane S is shown by a dotted line in FIG. 10.

[0050] Also in the thickness measurement method of this third embodiment, similarly to the first embodiment, since a virtual plane translated by a predetermined distance in a direction perpendicular to the target surface can be calculated within the construction shape, after the application of the coating material, the thickness of the entire coating material can be confirmed by one measurement. Also, the coating material application method using this thickness measurement method can provide a coating material of uniform quality regardless of the skill level of the operator, similarly to the first embodiment.

[0051] Next, a first embodiment of a system for measuring the thickness of the coating material of the present invention (hereinafter referred to as a thickness measurement system) will be described. The measurement system 20 in FIG. 5 includes a three-dimensional measurement device 21, a control unit 22, a reference marker 23, and a display unit 24. The three-dimensional measurement device 21 measures the construction shape including the three-dimensional shape of the surface of the coating material 12 applied to the target surface. This thickness measurement system 20 can be used for the thickness measurement method in FIG. 1. And the reference marker 23 is substantially the same as the reference marker 13 used in the thickness measurement method in FIG. 1.

[0052] The three-dimensional measurement device 21 is a three-dimensional scanner including a light emitting unit 21a that emits laser light, a light receiving unit 21b that receives the laser light reflected by the coating material, and a calculation unit (not shown). The three-dimensional measurement device 21 is substantially the same as the three-dimensional measurement device used in the measurement method in FIG. 1, and is not particularly limited as long as it can measure the three-dimensional shape of the surface of the coating material.

[0053] The control unit 22 includes a storage unit 26 and a data processing unit 27 that calculates the thickness of the coating material. The storage unit 26 stores the construction shape data including the three-dimensional shape of the surface of the coating material measured by the three-dimensional measurement device 21. It also stores the virtual plane data and the thickness data of the coating material calculated by the data processing unit 27 as described later. And it stores the three-dimensional data of the surface of the coating material and the thickness data of the coating material, particularly associating the coating material image with the target surface. In addition, environmental information such as the temperature and humidity during construction, spray conditions of the spray (mixing pressure and temperature of two-component rigid urethane foam), and moisture content data of the target surface may be associated with and stored in the coating material image. In addition, it is preferable to store these data as an electronic file with security set by a password and not editable. In particular, it is preferable to use an electronic file with a time stamp for anti-forgery proof and time proof. Also, the storage unit 26 itself may be locked with a password or the like so that those without special authority cannot rewrite it. The data stored in the storage unit 26 may be stored in a disk-shaped storage medium such as a CD or DVD, or a storage medium such as a USB or memory card by a person with special authority set by a password or the like. In particular, as the storage medium, a disk-shaped storage medium such as a CD-R or DVD-R that can write data only once, or a storage medium such as a USB or memory card with an anti-forgery function is preferable.

[0054] The data processing unit 27 automatically extracts the reference marker 23 based on the color or shape feature from the construction shape data, or extracts it as designated by the operator, calculates virtual plane data obtained by translating the target surface parallel by a predetermined distance in a direction perpendicular to the target surface based on the reference marker 23, and calculates the thickness of the coating material based on the three-dimensional shape data of the surface of the coating material and the virtual plane data. The calculation of the virtual plane data is performed in the same manner as the third step of the thickness measurement method in FIG. 1. Also, the thickness of the coating material is calculated in the same manner as the fourth step of the thickness measurement method in FIG. 1. In addition, the data processing unit 27 converts the construction shape data into an image showing the surface of the coating material, which is a coating material image indicating the thickness distribution of the coating material in color or shading. The coating material image is substantially the same as the thickness measurement method in FIG. 1. Furthermore, based on the thickness of the coating material, the data processing unit 27 identifies the portions of the coating material where the thickness of the coating material deviates from a predetermined range. That is, it automatically indicates the construction defect portions where the coating material is too thick or too thin. For example, such construction defect portions can be displayed in a special color in the coating material image, or only the defective portions can be extracted and displayed, or they can be made to blink. Also, it is preferable to indicate how much the construction defect portion deviates from the predetermined range.

[0055] The display unit 24 is a two-dimensional liquid crystal monitor that displays the coating material image created by the data processing unit 27.

[0056] After the coating material is applied, this measurement system 20 installs the reference marker 23 on the coating material and acquires the construction shape including the three-dimensional shape of the coating material and the reference marker 23, so that the overall thickness of the coating material can be calculated. Therefore, it is possible to easily identify the defective construction portions. Also, since the confirmation work can be performed at once, the labor of the operator can be significantly reduced. Furthermore, since it can be displayed as a coating material image on the display unit, on-site, the operator can easily and accurately confirm the position of the construction defect. Also, since the three-dimensional shape of the surface of the target surface and the coating material and the thickness of the coating material can be associated and stored, that is, since the data of the coating material can be collectively stored in association with the target surface, the quality control of the coating material can be easily performed. In this measurement system 20, data such as the thickness of the coating material is stored in the storage unit 26 of the control unit 22, but it may be directly stored in a storage medium such as a CD, DVD, USB, or memory card. In particular, by directly storing it in a disk-shaped storage medium such as a CD-R or DVD-R that allows data to be written only once, or a storage medium such as a USB or memory card with an anti-tampering function, the objectivity of the data can be maintained. Of course, not only directly storing it, but also copying the data once stored in the storage unit 26 to the storage medium in a non-modifiable state and then deleting the data in the storage unit 26 is also possible.

[0057] In the thickness measurement system 20, the reference marker 23 was recognized, and virtual plane data was calculated based on the reference marker 23. However, without using the reference marker 23, virtual plane data may be calculated based on the surface of a structure located adjacent to or in the vicinity of the target surface and parallel to the target surface of the structure. In the second embodiment of this thickness measurement system, the data processing unit 27 automatically extracts or the operator designates and extracts the surface of the structure parallel to the target surface from the construction shape data, and based on that surface, calculates virtual plane data obtained by translating the target surface parallel in a direction perpendicular to the target surface by a predetermined distance. The method for calculating the virtual plane is the same as step 2A of the thickness measurement method in FIG. 3. Other processing is substantially the same as that of the thickness measurement system 20.

[0058] As a third embodiment of the thickness measurement system, a projector may be used as the display unit 24 of the measurement system 20. In that case, in the data processing unit 27, it is preferable to perform alignment between the reference marker installed on the coating material and the reference marker of the projected image (or the plane of the structure), and perform projection mapping so that the thickness is displayed on the coating material. With this configuration, the operator can identify the position of construction defects of the coating material from the image projected on the target surface, so that the finishing process can be simplified.

[0059] The thickness measurement system 20a according to the fourth embodiment includes, as shown in FIG. 6, a three-dimensional measurement device 21, a control unit 22, a reference marker 23, and a glasses-type display 30. In this glasses-type display 30, the surface shape of the coating material is displayed so as to overlap with the target surface in the user's field of view. Note that the three-dimensional measurement device 21 and the control unit 22 including the storage unit 26 and the data processing unit 27 are substantially the same as the thickness measurement system 20 in FIG. 5.

[0060] The glasses-type display 30 includes a lens-shaped display unit 31, an image acquisition unit 32, and a display control unit 33. The lens-shaped display unit 31 is a transparent member fixed to the frame of the glasses-type display 30 so as to be positioned in front of the user's eyes when the glasses-type display 30 is attached to the user's head. The image acquisition unit 32 acquires, as image data, information on the viewing direction of the user's eyes through the lens-shaped display unit 31. For example, near the display unit 31, there is a camera or the like fixed to the frame of the glasses-type display 30.

[0061] The display control unit 33 includes a display storage unit 33a and a display data processing unit 33b (not shown). The display storage unit 33a stores the image data acquired by the image acquisition unit 32 and the coating material image created by the data processing unit 27. It also stores the geometric relationship between the display unit 31 and the image data. For example, it stores the positional relationship and size ratio relationship between the display unit 31 that projects the image and the image data acquired by the image acquisition unit 32. The display data processing unit 33b compares the image data acquired by the image acquisition unit 32 with the coating material image, and performs image deformation processing and alignment processing so that the reference markers of the image data and the reference markers of the coating material image overlap. Then, based on the relationship between the display unit 31 and the image data, the coating material image is projected onto the display unit 31 so that the coating material image overlaps the coating material in the user's field of view. The data communication between the display data processing unit 33b and the data processing unit 27 may be wired or wireless. Also, the calculation of the data processing unit 27 may be performed by the display data processing unit 33b, or conversely, the calculation of the display data processing unit 33b may be performed by the data processing unit 27.

[0062] With such a configuration, the operator can simply wear the glasses-type display 30 and confirm the position of the defective coating through the lens, making the finishing process even easier.

[0063] In the thickness measurement system 20a according to the fourth embodiment, similar to the thickness measurement system of the second embodiment, the data processing unit 27 may automatically extract a plane parallel to the target surface of the structure from the construction shape without using a reference marker, or the operator may specify and extract it, and based on the plane, calculate virtual plane data obtained by translating the target surface parallel by a predetermined distance in a direction perpendicular to the target surface. Furthermore, in the thickness measurement system 20a according to the fourth embodiment, the display unit 31 may be made opaque. In this case, the display unit displays the image captured by the image acquisition unit and the covering material image. The same effect can be obtained in this case as well.

[0064] Furthermore, as another embodiment of the measurement system of the present invention, for example, a wearable display such as a head-mounted display (HMD) may be used instead of the glasses-type display. In this case, the three-dimensional measurement device 21 and the control unit 22 are also incorporated in the HMD. Examples of such an HMD include "HoloLens (registered trademark)", a holographic computer manufactured by Microsoft. HoloLens (registered trademark) is a so-called mixed reality type wearable device that can project computer graphics over a real landscape. That is, in this three-dimensional measurement system, various sensors such as a 2D camera (image acquisition unit), a 3D sensor (three-dimensional measurement device), and an acceleration sensor (IMU), and a CPU (data processing unit and display data processing unit), a storage device (storage unit and display storage unit), etc. are incorporated in the HMD. This operation method involves installing a reference marker on the covering material, wearing HoloLens (registered trademark), acquiring the construction shape including the three-dimensional shape of the surface of the covering material after construction using the three-dimensional measurement device, calculating the constructed covering material image in real time, and projecting the reference marker of the covering material image so as to overlap the reference marker on the actual covering material with respect to the operator's field of view. In this way, the operator can confirm the construction result of the entire construction site in real time during the construction of the covering material, and can immediately take measures against defective construction locations where the thickness of the covering material is insufficient.

Example

[0065] The image in Fig. 7 is an image of the construction shape using a three-dimensional measuring device (the "F6 SMART", a handy 3D scanner manufactured by MantisVision). On this wall surface, the hatched part is the heat insulating material that has been constructed. In Fig. 7, the reference marker M1 in Fig. 8a is provided within the range of "Reference Installation Surface 1", and the reference marker M2 in Fig. 8b is provided within the range of "Reference Installation Surface 2". Note that the heat insulating material is sprayed with the rigid urethane foam shown in Table 1.

[0066]

Table 1

[0067] Fig. 8a is a contour diagram showing how far the three-dimensional shape of the surface of the heat insulating material is from the virtual plane based on the reference marker M1 provided on the heat insulating material. Fig. 8b is a contour diagram showing how far the three-dimensional shape of the surface of the heat insulating material is from the virtual plane based on the reference marker M2 provided on the column P adjacent to the target surface. In this way, the thickness and unevenness of the heat insulating material with respect to each virtual plane can be seen at a glance. And the operator can perform the finishing process using this image as a clue. Also, since the state of the heat insulating material can be stored as objective data in this way, it is also optimal as data for quality assurance of the constructed heat insulating material.

Explanation of Signs

[0068] 10, 10a, 10b Construction shapes; 11 Wall; 12 Coating material; 13 Reference marker; 13a Pin; 20, 20a Measurement system; 21 Three-dimensional measuring device; 21a Light-emitting part; 21b Light-receiving part; 22 Control part; 23 Reference marker; 24 Display part; 26 Memory part; 27 Data processing part; 30 Glasses-type display; 31 Display part; 32 Image acquisition part; 33 Display control part; 33a Display memory part; 33b Display data processing part; M1 Reference marker; M2 Reference marker; P Column; S Virtual plane; S1 Surface; S2 Surface; V1 Vertical line

Claims

1. A method for measuring the thickness of a coating material applied to a target surface, comprising: a step of obtaining a construction shape including three-dimensional coordinates of the surface of the coating material, three-dimensional coordinates of three or more equidistant points where the distances from the target surface are equal, and reference three-dimensional coordinates of one or more reference points where the distances from the target surface are known; a step of calculating the thickness of the coating material based on the three-dimensional coordinates of the surface of the coating material, the three-dimensional coordinates of the equidistant points, and the reference three-dimensional coordinates. A method for measuring the thickness of a coating material.

2. The distance from the target surface of the equidistant points is known, and the equidistant points are also the reference points. The method for measuring the thickness of a coating material according to Claim 1.

3. further comprising a step of calculating a virtual plane based on the three-dimensional coordinates of the obtained equidistant points, and calculating the thickness of the coating material based on the three-dimensional coordinates of the surface of the coating material and the virtual plane. The method for measuring the thickness of a coating material according to Claim 2.

4. The distance from the target surface of the equidistant points is unknown, and the reference points are different from the equidistant points. The method for measuring the thickness of a coating material according to Claim 1.

5. further comprising a step of calculating a virtual plane based on the three-dimensional coordinates of the obtained equidistant points and the reference three-dimensional coordinates, and calculating the thickness of the coating material based on the three-dimensional coordinates of the surface of the coating material and the virtual plane. The method for measuring the thickness of a coating material according to Claim 4.

6. before the step of obtaining the construction shape, comprising a step of installing a reference marker on or near the coating material, and the reference three-dimensional coordinates are the three-dimensional coordinates on the reference marker. The method for measuring the thickness of a coating material according to any one of Claims 1 to 5.

7. the reference marker has a pin extending in one direction, and the step of installing the reference marker is a step of inserting the pin through the coating material so that the tip of the pin abuts against the target surface. The method for measuring the thickness of a coating material according to Claim 6.

8. the equidistant points are points on the surface of the coating material and a structure adjacent to or near the target surface. The method for measuring the thickness of a coating material according to any one of Claims 1 to 5.

9. comprising a step of displaying a coating material image showing the distribution of the thickness of the coating material in color or shading. The method for measuring the thickness of a coating material according to any one of Claims 1 to 8.

10. comprising a step of determining the presence or absence of a construction defect where the thickness of the coating material is outside a predetermined range. Method for measuring the thickness of a coating material according to any one of claims 1 to 9.

11. A step of determining the presence or absence of a construction defect where the thickness of the coating material is outside a predetermined range, And a step of displaying the construction defect on the coating material image, The method for measuring the thickness of a coating material according to claim 9.

12. A step of storing the thickness of the coating material in association with the target surface, The method for measuring the thickness of a coating material according to any one of claims 1 to 11.

13. Before applying the coating material, a step of measuring the moisture content of the target surface, And a step of storing the moisture content in association with the thickness of the coating material, The method for measuring the thickness of a coating material according to claim 12.

14. Before applying the coating material, a step of measuring the temperature distribution of the target surface, And a step of storing the temperature distribution in association with the thickness of the coating material, The method for measuring the thickness of a coating material according to claim 12 or 13.

15. The coating material is a spray polyurethane foam insulation material, The method for measuring the thickness of a coating material according to any one of claims 1 to 14.

16. A step of obtaining the spraying conditions of the coating material, And a step of storing the spraying conditions in association with the thickness of the coating material, The method for measuring the thickness of a coating material according to claim 15.

17. A system for measuring the thickness of a coating material applied to a target surface, comprising: A three-dimensional measuring device, And a data processing unit, The three-dimensional measuring device obtains a construction shape including the three-dimensional coordinates of the surface of the coating material, the three-dimensional coordinates of three or more equidistant points where the distance from the target surface is equal, and the reference three-dimensional coordinates of one or more reference points where the distance from the target surface is known, The data processing unit calculates the thickness of the coating material based on the construction shape, Coating material thickness measurement system.

18. Further comprising a reference marker installed on or near the coating material and providing the reference three-dimensional coordinates, The data processing unit recognizes the reference marker based on the color or shape characteristics from the construction shape, The coating material thickness measurement system according to claim 17.

19. A method for applying a coating material to a target surface, comprising: A step of applying the coating material to the target surface, A step of obtaining the three-dimensional coordinates of the surface of the coating material, the three-dimensional coordinates of three or more equidistant points where the distance from the target surface is equal, and the reference three-dimensional coordinates of one or more reference points where the distance from the target surface is known, A step of calculating the thickness of the coating material based on the three-dimensional coordinates of the surface of the coating material, the three-dimensional coordinates of the equidistant points, and the reference three-dimensional coordinates; A step of determining whether there is a construction defect where the thickness of the coating material deviates from a predetermined range; A method for applying a coating material.

Images