JP6958993B2 - Civil engineering work performance evaluation system, workmanship evaluation method, and program - Google Patents

Description

The present invention relates to a workmanship evaluation system, a workmanship evaluation method, and a program for civil engineering work.

The finished form of conventional civil engineering work is expressed by two-dimensional information such as the shape of a typical vertical cross section of a construction object and a contour diagram, and the finished form has been evaluated based on the information. With such a conventional method, it is difficult for the evaluator to accurately image and evaluate the finished product.

In recent years, efforts have been made to improve the productivity of construction sites, and it is being considered to perform three-dimensional surveying by photogrammetry using a drone or the like and utilize it for evaluation of finished products.

Japanese Unexamined Patent Publication No. 2002-188149

It has not yet been fully investigated how to use the three-dimensional survey data to accurately and efficiently evaluate the finished product and improve the productivity of civil engineering work.

An object of the present invention is to provide a finished product evaluation system, a finished product evaluation method, and a program capable of improving the accuracy and efficiency of the finished product evaluation of civil engineering work using three-dimensional survey data.

(1) can form evaluation system civil works according to the present invention can form evaluation of evaluating the possible shape based on the three-dimensional coordinate data of the point group measured from can-shaped surface of the work object of civil works In the system, a storage unit that stores design data about the three-dimensional design shape of the construction object in advance and each element point of the point group are given an attribute indicating a deviation from the design shape, and are also added . Whether or not the element points are included in the space sandwiched between the two surfaces having the surface of the design shape parallel-moved in one direction and the other direction in a predetermined direction by a predetermined offset distance as a boundary surface. It has an evaluation unit that defines the attribute value of the attribute according to the determination result, and an image generation unit that generates an image of the finished three-dimensional model based on the point group. Of the element points, only those having the attribute value specified by the user are displayed in the image .

(2) In the finished product evaluation system of the above (1), the predetermined direction can be a vertical direction or a horizontal direction of a predetermined direction.

(3) In the finished product evaluation system of (1) or (2), the evaluation unit sets a plurality of the spaces having different offset distances, and the evaluation unit sets the space according to the combination of the discrimination results for each space. It can be configured to define attribute values.

(4) In the finished product evaluation system of (3) above, the offset distance is a standard value for the average value of the design shape with respect to the deviation on the surface and a standard value for the deviation of each element point. It can be two.

(5) In the finished product evaluation system of (1) to (4), the image generation unit can be configured to display the element points in the image in different colors for each attribute value.

( 6 ) The method for evaluating the finished form of civil engineering work according to the present invention is to evaluate the finished form based on the three-dimensional coordinate data of the point group measured from the surface of the finished form of the construction object of the civil engineering work. a method, acquiring design data for the three-dimensional design shape of the work target product to each element points of the point group, thereby giving an attribute representing the deviation from the design shape and the design Whether or not the element points are included in the space sandwiched between the two surfaces having the surface of the shape moved in parallel in one direction and the other direction in a predetermined direction by a predetermined offset distance as a boundary surface. It has an evaluation step of defining the attribute value of the attribute according to the determination result and an image generation step of generating an image of the finished three-dimensional model based on the point group, and the image step is the element point. Of these, only those having the attribute value specified by the user are displayed in the image .

( 7 ) The program according to the present invention is a program for causing a computer to perform a process of evaluating the finished shape based on three-dimensional coordinate data of a point group measured from the surface of the finished shape of a construction object for civil engineering work. The computer is a storage means for storing design data for the three-dimensional design shape of the construction object in advance, and each element point of the point group is given an attribute indicating a deviation from the design shape. At the same time, the element points are included in the space sandwiched between the two surfaces having the surface of the design shape moved in parallel in one direction and the other direction in a predetermined direction by a predetermined offset distance as a boundary surface. The image generation means by functioning as an evaluation means for defining the attribute value of the attribute according to the determination result of whether or not it is present , and an image generation means for generating an image of the finished three-dimensional model based on the point group. Displays only those element points having the attribute value specified by the user in the image .

According to the present invention, it is possible to improve the accuracy and efficiency in the performance evaluation of civil engineering work using three-dimensional survey data.

It is a block diagram which shows the schematic structure of the earthwork work form evaluation system which is an embodiment of this invention. It is a schematic processing flow chart of the earthwork work form evaluation system which is an embodiment of this invention. It is a schematic perspective view of a river embankment as an example of a construction object. It is a schematic perspective view which shows the boundary surface when the reference surface is the design shape of the embankment shown in FIG. It is a schematic cross-sectional view of the embankment which shows the example of the deviation evaluation using two offset distances in the embankment shown in FIG.

Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of an earthwork finished form evaluation system 2 according to an embodiment. This system includes an arithmetic processing unit 4, a storage device 6, an input device 8, and an output device 10. As the arithmetic processing unit 4, it is possible to create dedicated hardware for processing the system, but in the present embodiment, the arithmetic processing unit 4 is constructed by using a computer and a program executed on the computer. Will be done.

The arithmetic processing device 4 includes a CPU (Central Processing Unit) of a computer, and functions as an evaluation unit 20 and an image generation unit 22.

The storage device 6 is composed of a hard disk or the like built in the computer. The storage device 6 stores a program for making the arithmetic processing unit 4 function as the evaluation unit 20 and the image generation unit 22, other programs, and various data necessary for processing of this system. For example, the storage device 6 has design data 30 representing a three-dimensional design shape of the construction object and 3 of the construction object prior to the completion evaluation processing of the construction object of the civil engineering work by the earthwork completion evaluation system 2. As dimensional survey data, point group data 32 extracted by stereophotogrammetry from a ready-made aerial photograph is stored.

In recent years, in stereophotogrammetry, aerial photographs have been taken using an unmanned aerial vehicle (UAV), which is also called a drone. Further, there is a laser measurement technique for acquiring three-dimensional point cloud data representing the shape of a feature using a laser scanner, and the measurement result may be used as the point cloud data 32. As such a laser measurement technology, for example, a mobile mapping system (MMS) is known, and in this MMS, the shape of a feature is represented while traveling on a road using a laser scanner mounted on a vehicle. Acquire the 3D point cloud data. It is also possible to mount a laser scanner on the UAV and acquire point cloud data 32. With these methods, it is easy to obtain a point cloud with a higher density than the point cloud acquired based on photography or laser scanning from a conventional aircraft or the like. For example, the spacing between the element points constituting the point cloud Can be made to a few centimeters, which enables highly accurate evaluation of finished products.

The input device 8 is a keyboard, a mouse, or the like, and is used by the user to operate the system.

The output device 10 is a display, a printer, or the like, and is used for showing the evaluation result of the finished product by this system to the user by screen display, printing, or the like. In addition, the data related to the evaluation result may be output as data so that it can be used in other systems.

The evaluation unit 20 assigns an attribute representing a deviation from the design shape to each element point of the point cloud data 32.

The image generation unit 22 generates an image of a finished model, which is a three-dimensional model of the finished shape based on the point cloud data 32.

FIG. 2 is a schematic processing flow diagram of the earthwork finished form evaluation system 2. Here, the treatment will be described using a river embankment as an example of the construction object. FIG. 3 is a schematic perspective view of the river embankment 40. For example, the three-dimensional space is represented by the xyz Cartesian coordinate system, and the horizontal direction along the longitudinal direction of the embankment 40 is set as the x-axis. Further, the crossing direction of the embankment 40 is a horizontal direction orthogonal to the x-axis, and the y-axis is set in the crossing direction. Further, the vertical direction is the z-axis. The positive direction of the z-axis is set to be upward.

The arithmetic processing unit 4 reads the design data 30 and the point cloud data 32 from the storage device 6 for the construction object to be evaluated in the finished form (step S2).

The arithmetic processing device 4 functions as an evaluation unit 20, and uses two surfaces in which the surface of the design shape based on the design data 30 is translated in one direction and the other direction in a predetermined direction by a predetermined offset distance as a boundary surface. Depending on the determination result of whether or not the element points of the point group data 32 are included in the space sandwiched between the boundary surfaces, the attribute values of the attributes representing the deviations from the above-mentioned design shape of the element points are determined.

Specifically, the evaluation unit 20 generates a polygon model such as a TIN (Triangulated Irregular Network) representing a design shape from the design data 30. In the polygon model, for example, the height z of the surface of the model is defined with respect to an arbitrary horizontal position (x, y) in the model. Here, the surface of the polygon model is represented by a function z = f (x, y).

The offset distance used for evaluating the deviation from the design shape may be one or a plurality. Here, the number of offset distances used for evaluation is α, and k is a natural number such that 1 ≦ k ≦ α, and the offset distance is represented _{by d k.} Further, d _j <d _{j + 1} (j is a natural number such that 1 ≦ j ≦ α-1).

In the present embodiment, the deviation from the design shape in the vertical direction is obtained (step S4). Thus, the boundary surface, and z = f (x, y) reference plane S ₀ the plane represented by the positive direction of the z-axis the reference plane, shifted offset distance d _k on words, z = f Tableed by z = f (x, y) −d _{k, in} which the _{plane Sk +} represented by (x, y) + d _k and the reference plane are offset in the negative direction of the z-axis, that is, the offset distance d _{k downward.} It _{becomes the surface Sk−} to be formed. FIG. 4 is a schematic perspective view showing _{the boundary surfaces Sk +} and _{Sk− when the reference surface S 0} is the design shape of the embankment 40 shown in FIG.

ならば、Ｅ_ｋ＝１とし、

ならば、Ｅ_ｋ＝０とする。 The evaluation unit 20 determines whether or not the position of the element point p is between the boundary surfaces _{Sk +} and _{Sk−. Here, the value of the variable E k} is determined according to the discrimination result. For example, when p is between the boundary surfaces, E _k = 1 is defined, and when it is not between the boundary surfaces, E _k = 0 is defined. Specifically, assuming that the coordinates of p are (x _p , y _p , z _p ), the evaluation unit 20

Then, set _Ek = 1 and

Then, E _k = 0.

The evaluation unit 20 determines the dissociation attribute value of the element point p according to _Ek indicating the magnitude of the dissociation compared with the offset distance (step S6). When the degree of deviation from the design shape is divided by _{only one offset distance d 1} , the variable E ₁ is the deviation attribute value. On the other hand, when the degree of deviation from the design shape is divided _{by a plurality of offset distances d 1 to d α} , the deviation attribute value is defined according to the combination of the variables E _{1 to} E _α.

In this embodiment, an example of divergence evaluation using two offset distances will be described. FIG. 5 is a diagram showing an example in which two offset distances are used in the embankment 40 shown in FIG. 3, and is a schematic cross-sectional view perpendicular to the x-axis. The figure shows the cross-sectional shapes of the reference plane and the boundary plane at a certain position in the x direction. In addition, the point cloud is indicated by different marks "○", "Δ", and "×" depending on the difference in the deviation attribute value. Specifically, the point where the set (E ₁ , E _{2 ) of the variables E 1} and E ₂ is (1, 1) is indicated by "○", and the point where the combination of the variables is (0, 1) is indicated. The points "Δ" and (0,0) are indicated by "x".

For the offset distances d ₁ and d ₂ , standard values predetermined by the government or industry can be used. For example, as a standard value, an allowable upper limit value for the average value of the dissociation within the surface of the design shape and an allowable upper limit value for the dissociation of individual element points can be set. Therefore, the standard value for the average value on the surface of the design shape regarding the dissociation _{can be set to d 1,} and the standard value for the dissociation of the individual element points can be _{set to d 2.}

The evaluation unit 20 basically assigns an attribute value to each element point of the input point cloud data 32. That is, if the point cloud data 32 is a high-density point cloud as described above, the deviation attribute values are determined for all the element points of the high-density point cloud. On the other hand, the high-density point cloud is thinned out and converted into a low-density point cloud such as a point cloud consisting of a predetermined number of element points per square meter, and the converted point cloud is converted into a low-density point cloud. It can also be input to the evaluation unit 20.

The image generation unit 22 generates an image that displays the point cloud whose dissociation has been evaluated by the evaluation unit 20 as a finished three-dimensional model. For example, the image generation unit 22 displays all the element points to which the attribute values are given by the evaluation unit 20 on the image in different colors for each attribute value. For example, _{the element points of (E 1} , E ₂ ) (1, 1) are displayed in blue, the element points of (0, 1) are displayed in yellow, and the element points of (0, 0) are displayed in red.

The image generation unit 22 outputs the generated image data to the output device 10, and the output device 10 generates a specific image that can be visually recognized by the user based on the data.

The image generation unit 22 may display the design shape superimposed on the image displaying the finished three-dimensional model. For example, a TIN model of the design shape can be displayed in an image in a wire frame.

By making the image generated by the image generation unit 22 an image of the above-mentioned high-density point cloud instead of the low-density point cloud such as several points per square meter, it becomes easy to judge the detailed state of the finished product. .. In addition, a three-dimensional model is projected instead of a two-dimensional display form such as a vertical cross-sectional shape at a certain position of the construction object or a contour diagram showing the undulations of the surface of the construction object in a horizontal plane. By making it an image and making it possible to change the viewpoint when projecting, it becomes easy to grasp the state of the finished product.

Further, the image generation unit 22 is not an image in which the color of the element points is displayed in gradation in response to a continuous change in the deviation of the element points, but is relatively small in correspondence with the deviation attribute value defined by the evaluation unit 20. Generates an image in which point clouds are displayed in different colors. According to the image produced by the image generation unit 22, it becomes easy for the user to grasp a portion that exceeds the offset distance, which is a standard value, and a portion that does not.

Further, the image generation unit 22 may display only the element points having the attribute value specified by the user as the finished three-dimensional model on the image. In the above-mentioned image generated by the image generation unit 22, the evaluation result of the deviation of the element points is displayed in a relatively small number of colors, so that the user can easily grasp the difference in the evaluation result between the element points. Even so, the higher the density of the point cloud, the more complicated the display content of the image becomes, and the more difficult it is for the user to read the evaluation result. In such a case, it is possible to facilitate the interpretation by selectively displaying only some of the attribute values of the point cloud. For example, _{by displaying only the element points where (E 1} , E ₂ ) is (0, 0) or only the element points (0, 0) and (0, 1) on the image, it is possible to grasp the part where the deviation is large. Can be facilitated.

In the above-described embodiment, the deviation attribute value is defined based on the boundary surface in which the surface of the design shape is translated in the vertical direction, but the direction of the parallel movement is another direction depending on the construction object and the evaluation purpose. Can be. For example, when evaluating the position of the vertical plane in a construction object, the direction of the parallel movement can be the normal direction of the vertical plane.

2 Earthwork evaluation system, 4 arithmetic processing device, 6 storage device, 8 input device, 10 output device, 20 evaluation unit, 22 image generation unit, 30 design data, 32 point group data.

Claims (7)

It is a finished shape evaluation system that evaluates the finished shape based on the three-dimensional coordinate data of the point cloud measured from the surface of the finished shape of the construction object of the civil engineering work.
A storage unit that stores design data for the three-dimensional design shape of the construction object in advance,
Each element point of the point group, the addition to imparting an attribute that represents a deviation from the designed shape, the design of the surface shape in a predetermined direction while the direction and the other direction and the two that are translated by a predetermined offset distance An evaluation unit that defines the attribute value of the attribute according to the determination result of whether or not the element point is included in the space sandwiched by the boundary surface with the surface as the boundary surface.
It has an image generation unit that generates an image of the finished three-dimensional model based on the point cloud.
The image generation unit is a performance evaluation system characterized in that only those element points having the attribute value specified by the user are displayed on the image. The predetermined direction is a vertical direction or a horizontal direction in a predetermined direction.
The finished product evaluation system according to claim 1. The evaluation unit sets a plurality of the spaces having different offset distances, and defines the attribute values according to the combination of the discrimination results for each space.
The finished product evaluation system according to claim 1 or 2. The offset distance is two, a standard value for the average value of the design shape on the surface with respect to the deviation and a standard value for the deviation of the individual element points.
The finished product evaluation system according to claim 3. The image generation unit displays the element points on the image in different colors for each attribute value.
The finished product evaluation system according to any one of claims 1 to 4. It is a finished shape evaluation method that evaluates the finished shape based on the three-dimensional coordinate data of the point cloud measured from the surface of the finished shape of the construction object of the civil engineering work.
Steps to acquire design data for the three-dimensional design shape of the construction object, and
Each element point of the point group, the addition to imparting an attribute that represents a deviation from the designed shape, the design of the surface shape in a predetermined direction while the direction and the other direction and the two that are translated by a predetermined offset distance An evaluation step in which the attribute value of the attribute is defined according to the determination result of whether or not the element point is included in the space sandwiched by the boundary surface with the surface as the boundary surface.
It has an image generation step of generating an image of the finished 3D model based on the point cloud.
The image generation step is a performance evaluation method characterized in that only those element points having the attribute value specified by the user are displayed on the image. This is a program for causing a computer to perform a process of evaluating the finished shape based on three-dimensional coordinate data of a point cloud measured from the surface of the finished shape of a civil engineering work object.
A storage means for storing design data for the three-dimensional design shape of the construction object in advance.
Each element point of the point group, the addition to imparting an attribute that represents a deviation from the designed shape, the design of the surface shape in a predetermined direction while the direction and the other direction and the two that are translated by a predetermined offset distance An evaluation means that defines the attribute value of the attribute according to the determination result of whether or not the element point is included in the space sandwiched by the boundary surface with the surface as the boundary surface, and
It functions as an image generation means for generating an image of the finished three-dimensional model based on the point cloud.
The image generating means is a program characterized in that only those element points having the attribute value specified by the user are displayed on the image.

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