Structure management method and structure management system

Abstract

To provide a structure management method and a structure management system which properly manage design data compatible with BIM (building information modeling) or CIM (construction information modeling) on the basis of a survey using a laser scanner.SOLUTION: A method comprises the steps of: arranging marker data expressing a reference position of a structure in design data compatible with BIM or CIM that three-dimensionally expresses the structure in a virtual space (S101); arranging a target marker at a position corresponding to the reference position on the design data in a real space in which the structure actually exists (S103); acquiring point group data by surveying a peripheral space of the target marker (S105); and superimposing the point group data on the design data by making a computer device specify a point group corresponding to the target marker by analyzing the point group data and collating the specified point group with the marker data (S109, S111).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a structure management method and a structure management system. [Background technology]

[0002] In recent years, the Ministry of Land, Infrastructure, Transport and Tourism has published guidelines for BIM and CIM, and the introduction of BIM / CIM into work in the fields of architecture and civil engineering is progressing. BIM stands for Building Information Modeling, and is a three-dimensional model of a building created on a computer to which various attribute data has been added. CIM stands for Construction Information Modeling, and is the application of the BIM concept to the civil engineering field.

[0003] In light of the above background, various systems that assume the introduction of BIM / CIM have been proposed one after another (for example, Patent Document 1). Patent Document 1 discloses a technique for generating new and old three-dimensional models by converting point cloud models obtained by scanning or the like at different points in time using a voxel method, and then comparing the new and old three-dimensional models. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-103263 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 describes that a point cloud model of a building is generated by surveying from the air using a laser scanner or the like, and then compared with the building model in the design, but alignment needs to be performed using some kind of feature point as a reference position. However, Patent Document 1 does not mention this point in detail.

[0006] The present invention was invented in consideration of the above circumstances, and provides a structure management method that appropriately manages BIM / CIM compatible design data based on surveying using a laser scanner, as well as a structure management system that can be used for this management method. [Means for solving the problem]

[0007] According to the present invention, there is provided a method for managing a structure, comprising: a design step of placing marker data representing a reference position of the structure in design data corresponding to BIM (Building Information Modeling) or CIM (Construction Information Modeling), which represents the structure in three dimensions in a virtual space; a marker placement step of placing a target marker in a position corresponding to the reference position on the design data in the real space where the structure actually exists; a surveying step of placing a laser scanner at a position including the location of the target marker within its measurement range and surveying the space around the target marker to obtain point cloud data; and a superposition step of using a computer device to analyze the point cloud data to identify a point cloud corresponding to the target marker and compare the identified point cloud with the marker data, thereby superimposing the point cloud data and the design data.

[0008] According to the present invention, there is provided a structure management system comprising: a storage device that stores design data corresponding to BIM (Building Information Modeling) or CIM (Construction Information Modeling), which represents a structure in three dimensions in a virtual space; marker data that is placed within the design data and represents a reference position of the structure; a target marker that is placed in a real space where the structure actually exists, at a position that corresponds to the reference position on the design data; a laser scanner that is placed at a position that includes the location of the target marker in its measurement range, and that surveys the space surrounding the target marker to obtain point cloud data; and a computer device that analyzes the point cloud data to identify a point cloud that corresponds to the target marker, and compares the identified point cloud with the marker data, thereby superimposing the point cloud data and the design data.

[0009] As described above, the present invention provides marker data that serves as a reference position in three-dimensional design data, and performs surveying after placing target markers at positions in real space that correspond to the reference positions, thereby enabling highly accurate alignment of the design data of a structure with the point cloud data of the structure obtained by surveying using a laser scanner, making it easier to compare the design data and the point cloud data. [Effects of the Invention]

[0010] According to the present invention, there is provided a structure management method that appropriately manages BIM / CIM compatible design data based on surveying using a laser scanner, as well as a structure management system that can be used for this management method. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a configuration diagram of a management system 100. [Figure 2] FIG. 2(a) is a schematic diagram showing the relationship between object data and marker data represented by design data, and FIG. 2(b) is a schematic diagram showing the relationship between marker data and target markers. [Figure 3] FIG. 1 is a diagram showing a target marker according to the present invention. [Figure 4] FIG. 4 is a diagram showing an error map generated from measurement results for the target marker of FIG. 3. [Figure 5] 1 is a flowchart of a structure management method according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted where appropriate.

[0013] <System Configuration of Management System 100 According to the Present Invention> First, the system configuration of a management system 100 according to the present invention will be described. As shown in FIG. 1, the management system 100 includes a storage device 40, a target marker 10, a laser scanner 20, and a computer device 30. The management system 100 corresponds to the "structure management system" according to the present invention.

[0014] The storage device 40 is a database that stores design data related to the structure to be managed. The design data corresponds to BIM (Building Information Modeling) or CIM (Construction Information Modeling), and can represent the structure to be managed in three dimensions in a virtual space. Furthermore, marker data indicating the reference position of the structure is arranged in the design data, and the storage device 40 stores the marker data together with the design data. Here, identification information is attached to the marker data stored in the storage device 40. Here, the "identification information" is information that distinguishes between marker data arranged at different positions in the design data. Furthermore, in this embodiment, the "identification information" is used as information that distinguishes a combination of one marker data and a target marker associated therewith from a combination of another marker data and a target marker associated therewith.

[0015] The target marker 10 is a mark placed in the real space where the structure to be managed actually exists. The target marker 10 is placed at a position corresponding to a reference position on the design data stored in the storage device 40 (i.e., a position represented by the marker data). The target marker 10 has significant features in light of the object of the present invention, and the details of these features will be described later.

[0016] The laser scanner 20 is a surveying instrument placed in real space, and acquires three-dimensional point cloud data representing the shape of a structure to be managed by irradiating the periphery of the structure to be managed with laser light and scanning the periphery of the structure. When the laser scanner 20 measures the structure to be managed, the laser scanner 20 is placed so that the position of the target marker 10 is included in its measurement range, and the space surrounding the target marker 10 is surveyed. In carrying out the present invention, it is preferable that the laser scanner 20 scans the measurement range with laser light when carrying out measurement, and obtains image data by photographing the measurement range with a camera.

[0017] The computer device 30 analyzes the point cloud data acquired by the laser scanner 20 to identify the point cloud corresponding to the target marker 10, and performs a process of superimposing the point cloud data and design data by comparing the identified point cloud with the marker data. The computer device 30 is communicatively connected to the laser scanner 20, and can receive point cloud data and image data each time the laser scanner 20 acquires these data. However, in practicing the present invention, the laser scanner 20 and the computer device 30 do not necessarily need to be communicatively connected during a survey. For example, data exchange between the laser scanner 20 and the computer device 30 may be realized by having the computer device 30 read the point cloud data and image data saved by the laser scanner 20 during the survey after a series of survey-related tasks have been completed. In addition, it is preferable that the computer device 30 has hardware resources (CPU, ROM, RAM, etc.) with sufficient performance in light of the objectives of the present invention, and is capable of determining the color of each point cloud by analyzing the point cloud data and image data obtained from the laser scanner 20.

[0018] <About the structure management method using the management system 100> Next, a method for managing a structure using the above-described management system 100 will be described. Fig. 2(a) is a schematic diagram showing the relationship between object data and marker data represented by design data, and Fig. 2(b) is a schematic diagram showing the relationship between marker data Ma and target marker 10a. Note that Fig. 2(a) and Fig. 2(b) are both intended to show the concept of the present invention in a schematic manner, and do not accurately represent the size or orientation of each component.

[0019] Figure 2(a) shows a cross section of the structure to be managed, cut at a predetermined height and viewed from above. Here, the "predetermined height" is the height of the origin SP in the coordinate system of the design data. Object data W1, object data W2, object data W3, and object data W4 all represent walls of the structure. At the center of object data W1, a center line L1 of the wall represented by object data W1 is drawn. At the center of object data W2, a center line L2 of the wall represented by object data W2 is drawn. At the center of object data W3, a center line L3 of the wall represented by object data W3 is drawn. At the center of object data W4, a center line L4 of the wall represented by object data W4 is drawn. In this embodiment, the origin SP is the intersection of the center lines L1 and L2, as shown in the figure. 2(a) illustrates marker data placed at eight locations (marker data Ma, marker data Mb, marker data Mc, marker data Md, marker data Me, marker data Mf, marker data Mg, and marker data Mh). As illustrated, in this embodiment, each marker data is placed on an extension of each street center line and outside the structure to be managed.

[0020] In the practice of the present invention, the number of marker data to be placed in the design data is not limited to the number shown in Fig. 2(a). Furthermore, since it is preferable that the target markers placed in real space correspond one-to-one to the marker data placed in the design data, it is preferable that the number of marker data and the number of target markers are equal, but this is not necessarily the case.

[0021] 2(b) shows the positional relationship between the marker data Ma placed on an extension of the center line L2 in FIG. 2(a) and the target marker 10a associated with the marker data Ma. As described above, the marker data Ma is placed at the same height as the origin of the design data. However, due to various constraints in real space, it is difficult to place the target marker 10a exactly at the position represented by the marker data Ma. Therefore, the target marker 10a is placed near the position represented by the marker data Ma.

[0022] Here, in order to accurately align the design data of the structure with the point cloud data obtained by surveying the structure, it is necessary to measure the offset value between the target marker 10a arranged in real space and the marker data Ma associated with the target marker 10a. This is because, when the computer device 30 superimposes the point cloud data on the design data, the measured offset value is used to compare (align) the design data with the point cloud data. When measuring the offset values, an officially determined position (for example, the position of a boundary marker LM on a site where a structure to be managed is located) is used as a reference, as shown in Figure 2(b). The laser scanner 20 then measures the direction and magnitude of a vector X1 from the boundary marker LM to the origin SP, and the direction and magnitude of a vector X2 from the boundary marker LM to the target marker 10a. Furthermore, the computer device 30 can calculate an offset value X4 between the marker data Ma and the target marker 10a based on the measurement values ​​of the vectors X1 and X2 and the design value of the vector X3 from the origin SP to the marker data Ma in the design data. By using such a method to have the computer device 30 compare the design data with the point cloud data, the point cloud data acquired as a survey result can be superimposed on the design data with high accuracy.

[0023] Note that the method for calculating the offset value above has been explained using Figure 2(b) as an example only for the combination of marker data Ma and target marker 10a, but offset values ​​can also be calculated using a similar method for other marker data and target markers.

[0024] <Regarding the target marker 10 used in carrying out the present invention> Next, the target marker 10 used in the practice of the present invention will be described. When the above matching process is performed by the computer device 30, it is necessary to detect a point cloud corresponding to the target marker 10 from the point cloud data obtained as a result of measurement by the laser scanner 20. However, when attempting to detect a point cloud corresponding to the target marker 10 using known techniques, the target marker 10 may blend into a point cloud corresponding to another object present in the background of the target marker 10, and it is not possible to detect a point cloud corresponding to the target marker 10 with sufficient accuracy.

[0025] Therefore, the target marker 10 used in the practice of the present invention has the following features: Figure 3 is a diagram showing the target marker 10 according to the present invention. 3, the target marker 10 is roughly divided into several types of regions, which in this embodiment are referred to as region 11, region 12, region 13, and region 14. Note that region 12 is a collective term for regions 12a, 12b, and 12c shown in FIG.

[0026] Region 11 is a region that includes a shape, pattern, or color that represents the center position of target marker 10, and in this embodiment, it is a pattern that combines two white triangles and two black triangles, and the point where the vertices of the four triangles overlap corresponds to the center position of target marker 10. Region 11 corresponds to the "second region" according to the present invention. Region 12 is a region where the identification information assigned to target marker 10 is patterned (i.e., a region including a shape, pattern, or color that distinguishes it from other target markers). Region 12 corresponds to the "first region" according to the present invention. Here, "patterning of identification information" means that each target marker has the above-mentioned identification information in a manner that can be automatically recognized (deciphered by arithmetic processing) by computer device 30 from the measurement results (point cloud data and image data) of laser scanner 20. Area 13 is an area where a retroreflective material is provided, and surrounds the above-mentioned areas 11 and 12. A retroreflective material is a material that reflects light from a light source over a wide irradiation angle in a direction that is approximately along the optical path of the incident light, and has the opposite property to regular reflection (specular reflection). As described above, the light emitted from laser scanner 20 and the light reflected by the retroreflective material are out of phase with each other, so that laser scanner 20, which receives the reflected light, is unable to acquire processable point cloud data within the range where area 13 exists, and therefore processes that range as unmeasurable. The region 14 is a region provided at the outermost edge of the target marker 10, and surrounds the above-mentioned regions 11, 12, and 13.

[0027] When a laser scanner measures a retroreflective material, the phases of the light incident on the retroreflective material and the light reflected from the retroreflective material are aligned, so it is generally impossible to measure the area where the retroreflective material is present and the measurement is treated as an error. The present invention is a technology that takes advantage of the above phenomenon, generating an error map showing the unmeasurable range from the point cloud data acquired by measurement using a laser scanner, and then performing computer processing to identify the location of the target marker based on the generated error map (for example, identifying the location where the unmeasurable areas are concentrated as the location of the target marker). Since the feature of being immeasurable is less dependent on the environment in which the target marker is placed, the present invention can detect point clouds corresponding to the target marker with higher accuracy than computer processing based on features that have been focused on in known technologies (e.g., the shape or color of the target marker), thereby enabling accurate surveying.

[0028] The target marker 10 used in this embodiment is a flat plate, and the pattern of identification information (shape, design or color of area 12) drawn on both sides of the plate is the same, so the computer device 30 can decode the same identification information regardless of which side is measured by the laser scanner 20. Furthermore, regions 11, 12, and 14 may be formed from a material with properties different from the retroreflective material, and are preferably formed from a high-reflection material that has specular reflection or a reflection nearly equal to specular reflection, because this makes it easier to distinguish region 13 from other regions during analysis by computer device 30.

[0029] FIG. 4 is a diagram showing an error map generated from the measurement results for the target marker of FIG. The areas shown in black in Figure 4 are areas where the laser scanner 20 was unable to measure (error map), and the computer device 30 determines that these areas are in the range corresponding to area 13, and that the point cloud obtained from near these areas is a point cloud representing the location of the target marker 10 (areas 11, 12, and 14). Also, in Figure 4, the white area surrounded by black is the range in which the point clouds corresponding to areas 11 and 12 exist, and the computer device 30 determines the center position and identification information of the target marker 10 by analyzing the shape and color represented by these point clouds.

[0030] The computer device 30 does not need to determine that all of the locations that the laser scanner 20 was unable to measure correspond to the area 13, and it is preferable to narrow down the area that corresponds to the area 13 based on other conditions. For example, the computer device 30 may analyze the shape of the unmeasurable range represented by the error map and identify the range as the location of the target marker 10 (area 13) on the condition that the analyzed shape is a predetermined shape (in this embodiment, its outer edge is a square). Alternatively, the computer device 30 may analyze the size of the unmeasurable range represented by the radar map and identify the location of the target marker 10 (area 13) if the analyzed size falls within a predetermined threshold (smaller than the upper threshold and larger than the lower threshold). The above criteria may be changed as appropriate within the scope of achieving the object of the present invention, and known conditions not described in this specification may also be applied.

[0031] As described above, since the target marker 10 has the above-mentioned area 13, the computer device 30 can generate an error map indicating the range that could not be measured based on the measurement results of the laser scanner 20, and can identify the location of the target marker 10 based on the generated error map. Since the target marker 10 has the above-mentioned region 11, the computer device 30 can analyze the shape, pattern or color of the region 11, thereby detecting the center position of the target marker 10 through computer processing. Since the target marker 10 has the above-mentioned region 12, the computer device 30 can determine the identification information assigned to the target marker 10 by analyzing the shape, pattern or color of the region 12.

[0032] <Regarding the processing procedure of the structure management method according to the present invention> Next, the processing procedure of the structure management method according to the present invention will be described. FIG. 5 is a flowchart of a structure management method according to the present invention.

[0033] First, in carrying out the management method according to the present invention, the designer of the structure to be managed places marker data representing the reference position of the structure in the design data compatible with BIM / CIM (step S101). The processing of step S101 corresponds to the "design process" according to the present invention. As described above, each piece of marker data placed in the design data in step S101 is assigned with different identification information.

[0034] Next, a person who surveys the structure to be managed places the target marker 10 shown in Fig. 2 at a position corresponding to the reference position on the design data in the real space where the structure actually exists (step S103). The processing of step S103 corresponds to the "marker placement step" according to the present invention. As described above, in step S103, each target marker placed in real space is patterned with identification information, and a different identification pattern is drawn on each target marker.

[0035] Then, the person conducting the survey places the laser scanner 20 at a position whose measurement range includes the position of the target marker, measures the area measurable from that position, and obtains the measurement results (point cloud data and image data) (step S105). The processing in step S105 corresponds to the "surveying step" according to the present invention. If no measurement results have been obtained by the laser scanner 20 for the area to be measured (NO in step S107), the person conducting the survey moves the laser scanner 20 to another position and measures the measurable area from the new position. The person conducting the survey moves the position of the laser scanner 20 and repeats the process of step S105 multiple times until measurement results are obtained by the laser scanner 20 for all areas to be measured (YES in step S107).

[0036] Next, the computer device 30 analyzes the measurement results (point cloud data) of the laser scanner 20 acquired by the processing of step S105 to identify a point cloud corresponding to the target marker 10 (step S109), and compares the identified point cloud with the marker data to superimpose the point cloud data on the design data (step S111). The processing of steps S109 and S111 corresponds to the "superimposing step" according to the present invention. As described above, in the processing of step S109, the computer device 30 detects the range that could not be measured from the point cloud data to be analyzed, generates an error map, and identifies the location of the target marker 10 based on the generated error map. Furthermore, in the processing of step S111, the computer device 30 detects each identification pattern drawn on the target marker 10, and identifies the marker data to be matched with the point cloud corresponding to the target marker by linking the detected identification pattern to the identification information attached to the marker data.

[0037] Then, the computer device 30 outputs the point cloud data and the design data superimposed in step S111 in a manner that can be viewed by the user (step S113). The processing of step S113 corresponds to the "output step" of the present invention. Here, "outputting in a manner that can be viewed by the user" corresponds to, for example, a manner in which the data is displayed on a display device, a manner in which the data is printed out by a printer device, etc.

[0038] The manner in which the computer device 30 outputs the design data and point cloud data does not necessarily have to be in a format that represents them in three dimensions, and the manner in which the output is made can be changed within the scope of achieving the objectives of the present invention, such as by adding a display that reinforces the display of the design data and point cloud data (so-called extended display). For example, the computer device 30 may output design data corresponding to BIM / CIM in a format in which the design data is displayed as a floor plan and the point cloud data is superimposed on the floor plan, in order to make it easier for the user to view. Alternatively, the three-dimensional design data and the three-dimensional point cloud data may be superimposed and compared to extract differences, and areas that have not been constructed as designed may be highlighted. In this embodiment, when an area that has not been constructed as designed is identified, the computer device 30 may correct the design data stored in the storage device 40 to match the point cloud data.

[0039] As described above, according to the structure management method of the present invention, the design data and the surveying results (point cloud data) are matched based on a surveying operation that utilizes marker data included in the design data and target markers placed at positions corresponding to the marker data, thereby enabling alignment with each other with higher accuracy than conventional techniques. Furthermore, it is expected that the design data and point cloud data superimposed by implementing the present invention will be utilized for various services in the fields of architecture and civil engineering.

[0040] The target marker 10 used in the practice of the present invention has retroreflective material in at least a partial area, intentionally creating positions that are considered unmeasurable by the laser scanner 20. The computer device 30 then identifies the location of the target marker 10 based on an error map that represents these unmeasurable positions, and applies this information to combining point cloud data. The above-described method for detecting the target marker 10 is based on a novel idea and can be processed by computer with higher accuracy than conventional methods. As a result, it is possible to automate the joining of point cloud data with a level of accuracy that is practical, eliminating the need for manual work in the past and reducing the labor costs involved in surveying.

[0041] <Modification> The above-described embodiment of the present invention can be modified in various ways within the scope of achieving the object of the present invention. Reference will now be made to variants of the invention that have not yet been described.

[0042] In the above embodiment, the target marker 10, laser scanner 20, computer device 30, and storage device 40 shown in Fig. 1 are listed as components of the management system 100 according to the present invention, but these are merely a list of components necessary for explaining the present invention. Therefore, the structure management system according to the present invention may be realized by adding other components. Furthermore, the number of each component in the above-described embodiment is merely a specific example, and may be changed as appropriate within the scope of achieving the object of the present invention.

[0043] The embodiment of the target marker 10 shown in FIG. 3 is one specific example, and the present invention may be implemented using target markers of other embodiments. For example, while the target marker 10 shown in Fig. 3 has only a partial area made of retroreflective material, the target marker according to the present invention may have its entire area made of retroreflective material. Also, the target marker according to the present invention may have each area provided on only one side, or each area may be arranged in a different manner on the front and back sides.

[0044] Of the processes included in the flowchart of FIG. 5, some may be omitted and processes not shown may be added within the scope of achieving the object of the present invention. For example, the process corresponding to step S113 in FIG. 5 is not necessarily required to implement the present invention.

[0045] The present embodiment encompasses the following technical ideas. (1) A method for managing a structure, comprising: a design process for placing marker data representing a reference position of the structure in design data corresponding to BIM (Building Information Modeling) or CIM (Construction Information Modeling), which represents the structure in three dimensions in a virtual space; a marker placement process for placing a target marker in a position corresponding to the reference position on the design data in the real space where the structure actually exists; a surveying process for placing a laser scanner at a position including the location of the target marker within its measurement range, surveying the space surrounding the target marker, and acquiring point cloud data; and a superposition process for using a computer device to analyze the point cloud data to identify a point cloud corresponding to the target marker, and superimposing the point cloud data on the design data by matching the identified point cloud with the marker data. (2) The method for managing a structure according to (1), wherein, in the design step, a plurality of pieces of marker data each having different identification information attached thereto are arranged in the design data; in the marker arrangement step, a plurality of target markers each having different identification patterns attached thereto are arranged in real space; and in the superimposition step, the computer device detects the identification patterns attached to the target markers, associates the detected identification patterns with the identification information attached to the marker data, and identifies the marker data to be matched with a point cloud corresponding to the target marker. (3) The method for managing a structure according to (2), wherein, in the designing step, a plurality of pieces of marker data are arranged on an extension of a center line, which is a center line of a wall or a column of the structure, and outside the structure; in the marker arrangement step, a plurality of target markers are arranged in real space; in the surveying step, an offset value between the target marker arranged in real space and the marker data to be linked to the target marker is measured; and in the superimposing step, the computer device compares the target marker with the marker data using the measured offset value. (4) A structure management method described in any one of (1) to (3), further comprising an output process of outputting the point cloud data and the design data superimposed in the superimposition process in a manner that is visible to the user. (5) A method for managing a structure described in any one of (1) to (4), wherein the target marker is a flat plate and the identification patterns drawn on both sides of the flat plate are the same. (6) A method for managing a structure described in any one of (1) to (5), wherein the target marker has a first area in which an identification pattern is drawn and a second area in which a pattern representing the center position of the target marker is drawn. (7) A method for managing a structure described in (6), wherein the target marker is surrounded by an area in which the first and second areas are provided with retroreflective material, and in the superimposition process, the computer device detects areas that were unmeasurable in the point cloud data acquired in the surveying process, generates an error map, and identifies the location of the target marker based on the generated error map. (8) A structure management method according to (7), wherein in the superimposition process, the computer device identifies the location of the target marker when the shape of the unmeasurable range shown in the error map is a predetermined shape. (9) A structure management method described in (7) or (8), in which, in the superimposition process, the computer device identifies, among the unmeasurable ranges shown in the error map, the range whose size falls within a predetermined threshold as the location of the target marker. (10) A structure management system characterized by comprising: a storage device that stores design data corresponding to BIM (Building Information Modeling) or CIM (Construction Information Modeling), which represents a structure in three dimensions in a virtual space; and marker data that is placed in the design data and represents a reference position of the structure; a target marker that is placed in a real space where the structure actually exists, at a position corresponding to the reference position on the design data; a laser scanner that is placed at a position that includes the location of the target marker in its measurement range and surveys the space surrounding the target marker to obtain point cloud data; and a computer device that analyzes the point cloud data to identify a point cloud corresponding to the target marker and compares the identified point cloud with the marker data, thereby superimposing the point cloud data and the design data. [Explanation of symbols]

[0046] 100 Management Systems 10 Target Marker 11, 12, 13, 14 areas 20 Laser scanner 30 Computer Equipment 40 Storage device

Claims

1. a design process of placing marker data representing a reference position of a structure in design data corresponding to BIM (Building Information Modeling) or CIM (Construction Information Modeling), which represents a structure in three dimensions in a virtual space; a marker placement step of placing a target marker at a position corresponding to a reference position on the design data in a real space where the structure actually exists; a surveying step of placing a laser scanner at a position in a measurement range that includes the position of the target marker, and surveying the space surrounding the target marker to acquire point cloud data; a superimposing step in which a computer analyzes the point cloud data to identify a point cloud corresponding to the target marker, and compares the identified point cloud with the marker data, thereby superimposing the point cloud data and the design data; A structure management method comprising:

2. In the design step, a plurality of pieces of marker data each having different identification information attached thereto are arranged in the design data; In the marker placement step, a plurality of target markers each having a different identification pattern are placed in real space; In the superimposing step, the computer device detects identification patterns drawn on the target markers, associates the detected identification patterns with identification information attached to the marker data, and identifies the marker data to be matched with the point cloud corresponding to the target marker. The structure management method according to claim 1 .

3. In the design process, a plurality of pieces of marker data are arranged on an extension line of a center line, which is a center line of a wall or a column of the structure, and outside the structure; In the marker placement step, a plurality of the target markers are placed in real space; In the surveying step, an offset value between the target marker arranged in real space and the marker data associated with the target marker is measured; In the superimposing step, the computer device compares the target marker with the marker data using the measured offset value. The structure management method according to claim 2.

4. further including an output step of outputting the point cloud data and the design data superimposed in the superimposing step in a manner that can be viewed by a user. A method for managing a structure according to any one of claims 1 to 3.

5. the target marker is a flat plate, and the identification patterns drawn on both sides of the flat plate are the same; A method for managing a structure according to any one of claims 1 to 4.

6. The target marker has a first region in which an identification pattern is drawn, and a second region in which a pattern representing the center position of the target marker is drawn. A method for managing a structure according to any one of claims 1 to 5.

7. The target marker has the first region and the second region surrounded by a region provided with a retroreflective material, In the superimposing step, the computer device detects an unmeasurable range in the point cloud data acquired in the surveying step, generates an error map, and identifies the location of the target marker based on the generated error map. The structure management method according to claim 6.

8. In the superimposing step, the computer device identifies a position where the target marker is present when the shape of the unmeasurable range shown in the error map has a predetermined shape. The structure management method according to claim 7.

9. In the superimposing step, the computer device identifies, among the unmeasurable ranges represented in the error map, a range whose size falls within a predetermined threshold as the location of the target marker. The structure management method according to claim 7 or 8.

10. a storage device that stores design data corresponding to BIM (Building Information Modeling) or CIM (Construction Information Modeling), which represents a structure in three dimensions in a virtual space, and marker data that is placed in the design data and represents a reference position of the structure; a target marker placed at a position corresponding to a reference position on the design data in a real space where the structure actually exists; a laser scanner that is placed at a position whose measurement range includes the position of the target marker and that surveys the space surrounding the target marker to acquire point cloud data; a computer device that analyzes the point cloud data to identify a point cloud corresponding to the target marker, and compares the identified point cloud with the marker data, thereby superimposing the point cloud data and the design data; A structure management system comprising:

Images