Design support device, design support program, and design support method

Abstract

To provide a design support device, design support program, and design support method that can easily change the design of a slope face of a design model.SOLUTION: A design support device displays a design plan view of a three-dimensional design model of a road with a slope face, accepts a selected slope face in response to designation of a slope face area on the design plan view, displays an intensified area of the selected slope face, and changes the design of the three-dimensional design model so as to replace the selected slope face with a retaining wall and / or correct the gradient of the selected slope face. The design support device also displays a two-dimensional projection image of the three-dimensional design model, displays a cross-sectional view of the two-dimensional projection image in which the selected slope face is cut from a plan view direction of the road by a plane including an inclination direction of the selected slope face, and displays the cross-sectional view after the design change is made to the selected slope face.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to a design support device, a design support program, and a design support method for designing a three-dimensional design model of an earthwork structure. [Background technology]

[0002] When an earthwork structure such as a road, a railway track, or an embankment is constructed at a higher position than the current topography, the earth is piled up on the current topography, so-called embankment, and the earthwork structure is constructed on the embankment. When an earthwork structure is constructed at a lower position than the current topography, the current topography is excavated, so-called cut, and the earthwork structure is constructed in the excavated part. The construction of an embankment incurs the cost of purchasing and transporting the earth, and the construction of a cut incurs the cost of transporting and disposing of the excavated earth. In this way, both the construction of an embankment and the construction of a cut incur costs. When an earthwork structure such as a road is constructed at a place where there is a difference in elevation from the current topography, a slope of a sloping surface is provided on the side of the earthwork structure, and a structure is often adopted in which the earthwork structure is connected to the current topography via this slope. When designing an earthwork structure, as the range of the slope increases, the area of ​​embankment or cutting will expand, leading to higher construction costs, so the designed slope is replaced with a retaining wall or the slope gradient is changed, and the design is modified so that the retaining wall or the slope after the gradient change will connect to the existing topography. Retaining walls are wall-like structures that are installed on land with differences in elevation to prevent the soil on the sides from collapsing.

[0003] Design support software is used to design earthwork structures, and the conventional method for changing the design of a slope to a retaining wall involves changing the numerical values ​​of all design points on the drawing that are the connection positions between the slope and the current topography so that they are moved to the connection positions between the retaining wall and the current topography. However, this method requires a large amount of work and is time-consuming to change the design, so a retaining wall design device and a retaining wall design program described in the following Patent Document 1, which can efficiently design retaining walls, have been proposed and are known.

[0004] In this retaining wall design device, first, a section of a 3D road model where a retaining wall is to be placed is specified, and then a reference line for placing the retaining wall is set for this section. By setting in this way, the retaining wall is designed along the reference line. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-27340 A Summary of the Invention [Problem to be solved by the invention]

[0006] There is a demand from designers to refer to a plan view of a design model of an earthwork structure having slopes when selecting which slopes to change the design of, and directly select a slope that they feel is too wide for the site, and change it to a retaining wall or change the gradient of that slope. However, the retaining wall design device and the retaining wall design program described in Patent Document 1 require specifying the section in which the retaining wall is to be placed and setting a reference line for placing the retaining wall, and are unable to meet the demands of designers to directly select a slope and change it to a retaining wall.

[0007] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a design support apparatus, a design support program, and a design support method that can easily change the design of a slope of a design model. [Means for solving the problem]

[0008] In order to solve such problems, the invention described in claim 1 is a design support device for designing a three-dimensional design model of an earthwork structure, comprising a design plan drawing unit for displaying a plan view of the earthwork structure using a three-dimensional design model of the earthwork structure having a slope, a selected slope receiving unit for receiving a selected slope selected by specifying an area of ​​the slope on the displayed plan view of the earthwork structure, a design modification unit for making a design change to the three-dimensional design model so as to replace the selected slope with a retaining wall, and a control unit for causing the design plan drawing unit to display the plan view of the earthwork structure, and for controlling the operation of making the design change to the selected slope received by the selected slope receiving unit when the selected slope is received by the design modification unit.

[0009] The invention of claim 2 is a design support device for designing a three-dimensional design model of an earthwork structure, comprising: a design plan drawing unit for displaying a plan view of the earthwork structure using a three-dimensional design model of the earthwork structure having a slope; a selected slope receiving unit for receiving a selected slope selected by specifying an area of ​​the slope on the displayed plan view of the earthwork structure; a changed gradient receiving unit for receiving a changed gradient which is the gradient of the selected slope after the change; a design modification unit for making a design change to the three-dimensional design model so as to change the gradient of the selected slope to the changed gradient; and a control unit for causing the design plan drawing unit to display the plan view of the earthwork structure, and for controlling an operation of making the design change to the selected slope received by the design modification unit when the selected slope is received by the selected slope receiving unit and the changed gradient is received by the changed gradient receiving unit.

[0010] The invention according to claim 3, in addition to the configuration according to claim 1 or 2, further comprises a projection image drawing unit which displays a two-dimensional projection image of the three-dimensional design model viewed from an arbitrary projection point, a projection point coordinate receiving unit which receives projection point coordinates which are three-dimensional coordinates of the projection point, a cross-sectional line receiving unit which receives a cross-sectional line which is set so as to cut the selected slope with a plane including the inclination direction of the selected slope from the planar view direction of the earthwork structure for the two-dimensional projection image to be displayed, and a cross-sectional drawing unit which displays a cross-sectional view of the selected slope cut along the cross-sectional line from the planar view direction of the earthwork structure, wherein the control unit, when receiving the projection point coordinates in the projection point coordinate receiving unit, controls the projection image drawing unit to display the two-dimensional projection image of the three-dimensional design model viewed from the received projection point coordinates, and when receiving the cross-sectional line in the cross-sectional line receiving unit, controls the cross-sectional drawing unit to display the cross-sectional view, and after the design change of the selected slope is executed by the design change unit, the cross-sectional view after the design change is displayed.

[0011] The invention of claim 4, in addition to the configuration described in claim 3, has a selected slope emphasis unit that highlights the area of ​​the selected slope in the displayed plan view of the earthwork structure, and a change start instruction receiving unit that receives a design change start instruction to start the design change of the selected slope, and the control unit is characterized in that when the selected slope receiving unit receives the selected slope, the selected slope emphasis unit highlights the area of ​​the selected slope, and after the highlighting, when the change start instruction receiving unit receives the design change start instruction, the design change unit controls the design change unit to make the design change of the selected slope.

[0012] The invention of claim 5, in addition to the configuration described in claim 4, has a selected slope restoration unit that restores the selected slope to the three-dimensional design model before the design change, and a restoration instruction receiving unit that receives a restoration instruction, and the control unit is characterized in that when the restoration instruction receiving unit receives the restoration instruction, the selected slope restoration unit restores the three-dimensional design model to the selected slope before the design change.

[0013] The invention described in claim 6 is a design support program operating on a design support device which designs a three-dimensional design model of an earthwork structure, comprising a design plan drawing process which displays a plan view of the earthwork structure using a three-dimensional design model of the earthwork structure having a slope, a selected slope acceptance process which accepts a selected slope which is selected by specifying an area of ​​the slope on the displayed plan view of the earthwork structure, and a design change process which makes a design change to the three-dimensional design model so as to replace the selected slope with a retaining wall, characterized in that after the plan view of the earthwork structure is displayed in the design plan drawing process, when the selected slope is accepted in the selected slope acceptance process, the design change is made to the selected slope accepted by the design change process.

[0014] The invention described in claim 7 is a design support program that operates on a design support device that designs a three-dimensional design model of an earthwork structure, and includes a design plan drawing process that displays a plan view of the earthwork structure using a three-dimensional design model of the earthwork structure having a slope, a selected slope acceptance process that accepts a selected slope that is selected by specifying an area of ​​the slope on the displayed plan view of the earthwork structure, a changed gradient acceptance process that accepts a changed gradient that is the gradient of the selected slope after the change, and a design change process that makes a design change to the three-dimensional design model so as to change the gradient of the selected slope to the changed gradient, and is characterized in that after the plan view of the earthwork structure is displayed by the design plan drawing process, the selected slope is accepted by the selected slope acceptance process and the changed gradient is accepted by the changed gradient acceptance process, and the design change is made to the selected slope accepted by the design change process.

[0015] The invention according to claim 8, in addition to the configuration according to claim 6 or 7, includes a projection image drawing process for displaying a two-dimensional projection image of the three-dimensional design model viewed from an arbitrary projection point, a projection point coordinate receiving process for receiving projection point coordinates which are three-dimensional coordinates of the projection point, a cross-section receiving process for receiving a cross-section which is set so as to cut the selected slope with a plane including the inclination direction of the selected slope from the plan view direction of the earthwork structure for the two-dimensional projection image to be displayed, and a cross-section drawing process for displaying a cross-section which cuts the selected slope along the cross-section from the plan view direction of the earthwork structure, wherein when the projection point coordinates are received in the projection point coordinate receiving process, the projection image drawing process displays the two-dimensional projection image of the three-dimensional design model viewed from the received projection point coordinates, and when the cross-section line is received in the cross-section receiving process, the cross-section drawing process displays the cross-section, and after the design change of the selected slope is executed in the design change process, the cross-section after the design change is displayed.

[0016] The invention of claim 9, in addition to the configuration described in claim 8, comprises a selected slope emphasizing process for highlighting the area of ​​the selected slope in the displayed plan view of the earthwork structure, and a change start instruction receiving process for receiving a design change start instruction to start the design change of the selected slope, and is characterized in that when the selected slope is received in the selected slope receiving process, the area of ​​the selected slope is highlighted by the selected slope emphasizing process, and after this highlighting, when the design change start instruction is received in the change start instruction receiving process, the design change of the selected slope is made by the design change processing.

[0017] The invention of claim 10, in addition to the configuration described in claim 9, is characterized in that it comprises a selected slope restoration process that restores the selected slope to the three-dimensional design model before the design change, and a restoration instruction reception process that receives a restoration instruction, and when the restoration instruction is received in the restoration instruction reception process, the selected slope restoration process restores the three-dimensional design model to the selected slope before the design change.

[0018] The invention described in claim 11 is a design support method used in a design support device which designs a three-dimensional design model of an earthwork structure, comprising a design plan drawing step of displaying a plan view of the earthwork structure using a three-dimensional design model of the earthwork structure having a slope, a selected slope acceptance step of accepting a selected slope selected by specifying an area of ​​the slope on the displayed plan view of the earthwork structure, and a design modification step of modifying the design of the three-dimensional design model so as to replace the selected slope with a retaining wall, characterized in that after the plan view of the earthwork structure is displayed in the design plan drawing step, when the selected slope is accepted in the selected slope acceptance step, the design modification is made to the selected slope accepted by the design modification step.

[0019] The invention described in claim 12 is a design support method used in a design support device which designs a three-dimensional design model of an earthwork structure, comprising a design plan drawing step of displaying a plan view of the earthwork structure using a three-dimensional design model of the earthwork structure having a slope, a selected slope receiving step of receiving a selected slope selected by specifying an area of ​​the slope on the displayed plan view of the earthwork structure, a changed gradient receiving step of receiving a changed gradient which is the gradient of the selected slope after the change, and a design change step of making a design change to the three-dimensional design model so as to change the gradient of the selected slope to the changed gradient, characterized in that after the plan view of the earthwork structure is displayed in the design plan drawing step, the selected slope is received in the selected slope receiving step and the changed gradient is received in the changed gradient receiving step, and then the design change is made to the selected slope received in the design change step.

[0020] The invention according to claim 13, in addition to the configuration according to claim 11 or 12, includes a projection image drawing step of displaying a two-dimensional projection image of the three-dimensional design model viewed from an arbitrary projection point, a projection point coordinate receiving step of receiving projection point coordinates which are three-dimensional coordinates of the projection point, a cross-sectional line receiving step of receiving a cross-sectional line which is set so as to cut the selected slope with a plane including the inclination direction of the selected slope from the planar view direction of the earthwork structure for the two-dimensional projection image to be displayed, and a cross-sectional view drawing step of displaying a cross-sectional view cutting the selected slope along the cross-sectional line from the planar view direction of the earthwork structure, wherein when the projection point coordinates are received in the projection point coordinate receiving step, the two-dimensional projection image of the three-dimensional design model viewed from the received projection point coordinates is displayed by the projection image drawing step, and when the cross-sectional line is received in the cross-sectional line receiving step, the cross-sectional view is displayed by the cross-sectional view drawing step, and after the design change of the selected slope is executed in the design change step, the cross-sectional view after the design change is displayed. Effect of the Invention

[0021] According to the inventions of claims 1, 6 and 11, a plan view of the earthwork structure is displayed using a three-dimensional design model of the earthwork structure, and the three-dimensional design model is modified so that a slope selected on the plan view is replaced with a retaining wall. In this way, a slope on the three-dimensional design model can be directly selected and the design can be easily modified to a retaining wall.

[0022] According to the invention of claims 2, 7 and 12, a plan view of the earthwork structure is displayed using a three-dimensional design model of the earthwork structure, and the three-dimensional design model is changed so that the gradient of a slope selected on the plan view is corrected to a changed gradient. In this way, the slope of the three-dimensional design model can be directly selected and the gradient can be easily changed.

[0023] According to the invention of claims 3, 8 and 13, a two-dimensional projected image of a three-dimensional design model is displayed, and when a cross-sectional line is set on the two-dimensional projected image to cut a slope, a cross-sectional view is displayed along the cross-sectional line. In this way, the cross-sectional view of the three-dimensional design model can be easily displayed. In addition, after the design of the slope is changed, the cross-sectional view after the design change can be displayed.

[0024] According to the inventions of claims 4 and 9, the slope to be changed is highlighted, making it easy to visually confirm and preventing erroneous design changes.

[0025] According to the inventions of claims 5 and 10, even after a design change, the slope can be restored to its pre-change state, allowing the designer to design with peace of mind knowing that the design change can be redone. [Brief description of the drawings]

[0026] [Figure 1] 1 is a system schematic diagram showing a configuration in which a design support apparatus according to an embodiment of the present invention and a digital map providing server are connected via a communication line. [Diagram 2] 2 is a schematic functional block diagram of the design support apparatus according to the embodiment; FIG. [Diagram 3] 4A and 4B are diagrams showing the process of designing a road using the design support device of the embodiment, in which (a) is a schematic diagram showing how a road alignment is set on the current topography, and (b) is a schematic diagram showing how a roadway, shoulders, and sidewalks are set. [Figure 4] 5A and 5B are diagrams showing a road design process using the design support device according to the embodiment, in which (a) is a schematic diagram in which a vertical section alignment is set on a current vertical section view, and (b) is a schematic diagram in which a slope is set. [Diagram 5] 3 is a schematic cross-sectional view showing a road design process using the design support device according to the embodiment. FIG. [Figure 6] 10A to 10C are diagrams illustrating an example of a method for creating a three-dimensional design model including a slope in a road design process using the design support device according to the embodiment. [Figure 7]1 is a schematic diagram showing a three-dimensional design model of a road displayed as a two-dimensional projected image in a road design process using the design support device according to the embodiment. FIG. [Figure 8] 1A and 1B are diagrams showing the process of designing a road using a design support device according to the embodiment, in which (a) is a schematic diagram showing a transverse line set in a two-dimensional projection image, and (b) is a schematic diagram showing a transverse cross-section of a road cut along the transverse line. [Figure 9] 2 is a schematic diagram showing a plan view (design plan view) of a road in which a selected slope is highlighted in a road design process using the design support device according to the embodiment. FIG. [Figure 10] 13 is a schematic diagram showing a design change input screen for a selected slope in the road design process by the design support device according to the embodiment. FIG. [Figure 11] 1A and 1B are diagrams showing the road design process using a design support device of the same embodiment, in which (a) is a schematic diagram of a two-dimensional projection image of a three-dimensional design model in which a selected slope has been redesigned to be a retaining wall, and (b) is a schematic diagram showing a cross-section of a road cut along a transverse line. [Figure 12] 2 is a schematic diagram illustrating a flow of creating a three-dimensional design model of a road in the design support device according to the embodiment. FIG. [Figure 13] 11 is a schematic diagram illustrating a flow of selecting a slope of a three-dimensional design model of a road and changing the design to a retaining wall in the design support device of the embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] An embodiment of the present invention will be described with reference to FIGS. 1 to 13. FIG.

[0028] FIG. 1 is a schematic diagram of a system in which a design support device 1 according to an embodiment of the present invention and a digital map providing server 2 are connected via a communication line 9.

[0029] The design support device 1 is used for designing earthwork structures such as roads, railway tracks, and embankments, and is a device that designs and configures a three-dimensional design model 82 based on design data of the earthwork structure to be designed. Earthwork structures such as roads are designed on a current topography 72 that is configured using a digital map 60 acquired from a digital map providing server 2. In this embodiment, the design of roads will be described as an example, but the present invention is not limited to this form and can be modified as appropriate. For example, the present invention can also be applied to the design of earthwork structures such as railway tracks, embankments, tunnel entrances, and bridge foundations.

[0030] The digital map providing server 2 is a server where digital maps 60 created by the Geospatial Information Authority of Japan and others can be purchased, and anyone, not limited to the design support device 1, can access the digital map providing server 2 to receive the digital map 60. The digital map 60 includes map information, mesh elevation information, place name information, and other information in digital format. The map information includes highly accurate geospatial information, the mesh elevation information includes, for example, information on 5m mesh elevation and 10m mesh elevation, and the place name information includes data on residential place names, natural place names, public facilities, signalized intersections, and the like. The digital map 60 is repeatedly updated to the latest information in the digital map providing server 2. This digital map 60 includes map information and elevation information for each point on the map, and using these data, the current topography 72, which is a topographical map at the time of creating the digital map 60, is configured as three-dimensional digital data.

[0031] The communication line 9 connecting the design support device 1 and the digital map providing server 2 uses the Internet or the like.

[0032] Although FIG. 1 shows an example in which a design support program is installed in a PC (Personal Computer) used by a designer to configure the design support device 1, the present invention is not limited to this embodiment. The design support device 1 may be configured as a server, and the designer may access this server to design an earthwork structure.

[0033] 2 is a schematic functional block diagram of the design support device 1. When designing a road with the design support device 1, a design support program is operated to set the cross-sectional shape of the road, such as the road surface 71 and the slope 69, and set the road route (road alignment 61) on the current topography 72. Next, the height of the longitudinal section along the road route (road alignment 61) is set. By carrying out such settings, the road is designed, and a three-dimensional design model 82 is constructed based on the design data.

[0034] This design support device 1 is configured to include a control unit 10, an auxiliary memory means 12, an input unit 14, a digital map request unit 16, a digital map receiving unit 18, a display unit 20, a road surface slope information receiving unit 22, a road line shape receiving unit 24, a longitudinal section line shape receiving unit 26, a road design data construction unit 27, a three-dimensional design model construction unit 28, a three-dimensional design model memory unit 30, a projection point coordinate receiving unit 32, a projection image drawing unit 34, a transverse line receiving unit 36, a transverse section drawing unit 38, a design plan drawing unit 40, a selected slope receiving unit 42, a selected slope emphasis unit 43, a change type receiving unit 44, a change gradient receiving unit 45, a change start instruction receiving unit 46, a pre-design change design model memory unit 48, a design change unit 50, a restoration instruction receiving unit 52, a selected slope restoration unit 54, and a communication unit 56.

[0035] The control unit 10 is configured to include a CPU (Central Processing Unit) not shown, and a RAM (Random Access Memory) which is a volatile memory. The CPU executes the design support program and other programs, performs arithmetic processing, and controls each element constituting the design support device 1. The RAM is used as a work area for the CPU to execute programs and perform arithmetic processing.

[0036] The auxiliary storage means 12 stores a design support program for designing a road and constructing a three-dimensional design model 82 of the road, other programs executed by the CPU, registration data used in those programs, design data of the road designed using the design support program, etc. The auxiliary storage means 12 is composed of a non-volatile storage device, and an HDD (Hard Disk Drive), SSD (Solid State Drive), etc. are used.

[0037] The input unit 14 is configured with an input device that enables the designer to input data to the design support device 1, and may be a keyboard, a mouse, a touch panel, or the like.

[0038] The digital map requesting unit 16, under the control of the control unit 10, requests the digital map 60 of the area for designing a road from the digital map providing server 2. The digital map receiving unit 18 receives data constituting the digital map 60 provided from the digital map providing server 2. The received data of the digital map 60 is stored in the auxiliary storage means 12, and the control unit 10 configures a current topography 72, which is a topographical map, as three-dimensional digital data based on the data of the digital map 60.

[0039] It is also possible to adopt a configuration in which the digital map requesting unit 16 and the digital map receiving unit 18 are not included in the functional block diagram of the design support device 1. In this case, the data of the digital map 60 is obtained in advance by accessing the digital map providing server 2 using a web browser of a PC (software for connecting to a web server using a PC or the like), or the data of the digital map 60 recorded on a recording medium such as a DVD-ROM (Digital Versatile Disk Read Only Memory) is read by an optical disk drive connected to the PC, and stored in the auxiliary storage means 12. Also, the data of the digital map 60 may be created from a surveying operation or a paper topographical map, and stored in the auxiliary storage means 12. Thereafter, the design support device 1 uses the data of the digital map 60 stored in the auxiliary storage means 12 to carry out design.

[0040] The display unit 20 is configured with a display device for displaying the design data, the three-dimensional design model 82, etc., and uses a display device such as a touch panel LCD (Liquid Crystal Display) or an organic EL (Electro-Luminescence) display.

[0041] The road surface slope information receiving unit 22 receives setting values ​​of the road cross-sectional shape input by the designer from the input unit 14 under the control of the control unit 10. As the setting values ​​of the road cross-sectional shape, for example, the widths of the left and right carriageways 64 of the road, the widths of the left and right shoulders 65, the widths of the left and right sidewalks 66, the gradients of the left and right slopes 69 provided on the sides of the road, the height (vertical height) of one step of the slopes 69, the width of the berms 70 which are horizontal parts connecting the slopes 69 when multiple steps of the slopes 69 are constructed from a high position to a low position, and the like are input.

[0042] The road alignment receiving unit 24 receives a road alignment 61, which is a design route of a road, input by the designer from the input unit 14. The designer causes the display unit 20 to display a plan view of the current topography 72, and sets the road alignment 61 on the plan view.

[0043] FIG. 3(a) is a schematic diagram showing a road alignment 61 set on a current topography 72. Design control points called measurement points 62, which are assigned numbers such as No. 17, No. 18, and No. 19, are automatically set at a predetermined interval on the road alignment 61. The intervals of the measurement points 62 are preset, for example, at 20 m intervals. The intervals of the measurement points 62 can be changed, and can also be changed according to the radius of curvature of the road alignment 61. For example, the intervals of the measurement points 62 may be changed so that the intervals are 20 m when the radius of curvature is 1000 m or more, 20 m when the radius of curvature is 1000 m to 200 m, 10 m when the radius of curvature is 200 m to 100 m, 5 m when the radius of curvature is 100 m to 50 m, 2 m when the radius of curvature is 50 m to 20 m, and 1 m when the radius of curvature is 20 m or more. A straight line that intersects perpendicularly with the road alignment 61 and passes through measurement point 62 is designated as a control section line 63, and a cross-sectional view of the designed road cut along this control section line 63 from the plan view direction is delivered to the client as a control section view.

[0044] 3(b) is a schematic diagram designed to add a roadway 64, a road shoulder 65, and a sidewalk 66 with a road alignment 61 as a center line. The roadway 64, the sidewalk 66, etc. are automatically designed based on the set values ​​of the cross-sectional shape of the road received by the road slope information receiving unit 22. In addition, in this diagram, a control section line 63 is displayed for each measurement point 62.

[0045] 2 receives a vertical section alignment 68, which is a design value of the road height, input by a designer from the input unit 14. The vertical section alignment 68 is a line connecting the design values ​​of the road height displayed as a vertical section when the current topography 72 is cut along the road alignment 61 in a planar view direction.

[0046] 4(a) is a schematic diagram in which a vertical alignment 68 is set on an existing vertical section 67. The existing vertical section 67 is a cross-sectional view of the existing topography 72 cut along the road alignment 61 from the plan view direction of the existing topography 72. In the portion where the vertical alignment 68 is located higher than the existing vertical section 67, the road is constructed by filling the existing topography 72. In the portion where the vertical alignment 68 is located lower than the existing vertical section 67, the road is constructed by excavating the existing topography 72.

[0047] When the longitudinal alignment 68 is set, the design value of the road height is determined, and therefore the design of the slope 69 that is provided on the side of the road so as to connect to the existing topography 72 is also performed. The design of this slope 69 is performed automatically based on the set value of the cross-sectional shape of the road.

[0048] 4(b) is a schematic diagram of a design that adds a slope 69. Slopes 69 are provided on both sides of the left and right sidewalks 66, and in sections where the difference in height between the road surface 71 and the current topography 72 is higher than the height (vertical height) of one step of the set slope 69, multiple steps of slopes 69 are designed. In addition, berms 70 are designed to connect the multiple steps of slopes 69.

[0049] Figure 5 is a schematic diagram of a control section cut along a control section line 63. Slopes 69 are designed on both sides of a road surface 71, and the slopes 69, which are designed in multiple stages in the height direction, are connected via small steps 70. The cross section of the designed road is called a planned cross section 73, and the cross section of the current topography 72 is called a current cross section 74.

[0050] 2 composes road design data based on the setting data received by the road slope information receiving unit 22, the road linear alignment receiving unit 24, and the vertical section linear alignment receiving unit 26. The constructed road design data is stored in the auxiliary storage means 12.

[0051] The three-dimensional design model constructing unit 28 constructs a three-dimensional design model 82 based on the design data of the road.

[0052] 6 is a diagram for explaining an example of a method for creating a three-dimensional design model 82 of a road including a slope 69. This diagram shows how slopes 69 are designed on both the left and right sides of a road surface 71, with the slope 69 on the right side of the paper being designed to be constructed by cutting the current topography 72, and the slope 69 on the left side of the paper being designed to be constructed by filling the current topography 72.

[0053] First, a control section line 63, which is a straight line that passes through measurement point 62 and is perpendicular to road alignment 61, is projected onto the road, which is an earthwork structure, and this projected control section line 63 divides the road surface 71 and slope 69 as virtual planes.

[0054] For the road surface 71, these virtually divided planes are used as elements constituting the road surface 71 of the three-dimensional design model 82.

[0055] For the slope 69, each plane virtually divided by the control section line 63 is divided into small planes each having a predetermined width in a direction perpendicular to the inclination direction of the slope 69. Hereinafter, these virtually divided small planes are referred to as slope-constituting small planes 80. That is, the slope 69 virtually divided by the control section line 63 is formed by arranging a plurality of slope-constituting small planes 80 along the inclination direction of the slope 69. These slope-constituting small planes 80 are used as elements constituting the slope 69 of the three-dimensional design model 82. In addition, in order to form the boundary portion between the slope 69 and the current topography 72, data of an extended slope is created by adding and arranging the slope-constituting small planes 80 so that the slope 69 extends along the inclination direction of the slope 69.

[0056] Next, the current terrain 72 before the road design is divided into meshes and planes are fitted to it. The mesh-like plane fitted to the current terrain 72 is hereinafter referred to as the current terrain mesh plane 81. By carrying out such processing, the current terrain 72 is expressed as a collection of multiple planes consisting of the current terrain mesh planes 81. The current terrain mesh planes 81 are used as elements constituting the current terrain 72 of the three-dimensional design model 82.

[0057] Then, the intersection line between the slope constituent small plane 80 included in the created extension slope data and the current terrain mesh plane 81 of the current terrain 72 is calculated, and this intersection line is used as an element that constitutes the boundary between the slope 69 of the three-dimensional design model 82 and the current terrain 72.

[0058] Finally, in the area where a road is designed on the current terrain 72, elements constituting the road surface 71 and the slope 69 are adopted, and in the area where a road is not designed, a current terrain mesh plane 81 showing the current terrain 72 is adopted, thereby constructing a three-dimensional design model 82.

[0059] Moreover, each element such as the slope-constituting facets 80 constituting the slope 69 of the three-dimensional design model 82 is associated with each slope 69, and information is added to each element as to which slope 69 it constitutes. With this information linking the elements to the slopes 69, when a certain slope 69 is specified, all elements of the three-dimensional design model 82 that constitute that slope 69 can be extracted.

[0060] The three-dimensional design model storage unit 30 shown in FIG. 2 stores configuration data of the three-dimensional design model 82 configured by the three-dimensional design model configuration unit 28.

[0061] The projection point coordinate receiving unit 32 receives the coordinates of a projection point when the three-dimensional design model 82 is displayed on the display unit 20 as a two-dimensional projected image 83. The three-dimensional coordinates of the projection point are input from the input unit 14 by the designer.

[0062] The projection image drawing unit 34 causes the display unit 20 to display a two-dimensional projection image 83 of the three-dimensional design model 82 as viewed from the projection point coordinates received by the projection point coordinate receiving unit 32. Fig. 7 is a schematic diagram showing a three-dimensional design model 82 of a road displayed as a two-dimensional projection image 83. By arbitrarily changing the projection point coordinates, the two-dimensional projection image 83 of the three-dimensional design model 82 as viewed from an arbitrary projection point is displayed.

[0063] The cross-section line receiving unit 36 ​​receives a cross-section line 75 that specifies the display position of the cross section of the road. The cross-section line 75 is input by the designer through the input unit 14. The cross-section line 75 is set so as to cut the selected slope 85 with a plane including the inclination direction of the selected slope 85 from the plan view direction of the road in the displayed two-dimensional projection image 83. FIG. 8(a) is a schematic diagram showing the cross-section line 75 set in the two-dimensional projection image 83. The cross-section line 75 is parallel to the management section line 63, which is a straight line that is perpendicular to the road alignment 61 and passes through the measurement point 62. For this reason, the measurement point 62 or the management section line 63 may be specified as the cross-section line 75. Also, the cross-section line 75 in any direction may be specified so that any section of the road is displayed.

[0064] The cross-sectional view drawing unit 38 displays on the display unit 20 a cross-section of the road cut from a plan view direction along the cross-sectional line 75 received by the cross-sectional line receiving unit 36. Fig. 8(b) is a schematic diagram showing a cross-sectional view of the road cut along the cross-sectional line 75 shown in Fig. 8(a). A planned cross-sectional view 73 consisting of the road surface 71, the slope 69, and the berm 70, and a current cross-sectional view 74 consisting of the current topography 72 are displayed.

[0065] When the control unit 10 receives projection point coordinates at the projection point coordinate receiving unit 32, it controls the projection image drawing unit 34 to display a two-dimensional projection image 83 of the three-dimensional design model 82 viewed from the received projection point coordinates, and when the control unit 10 receives a transverse line 75 at the transverse line receiving unit 36, it controls the transverse section drawing unit 38 to display a transverse section.

[0066] The design plan drawing unit 40 uses a three-dimensional design model 82 of a road having a slope 69 to display a plan view of the road on the display unit 20. The plan view of the road displayed using the three-dimensional design model 82 in this manner is hereinafter referred to as a design plan view 84. When the designer inputs an instruction to display the design plan view 84 to the input unit 14, or when the projection point coordinate receiving unit 32 receives coordinates for displaying the design plan view 84, the design plan drawing unit 40 displays the design plan view 84 under the control of the control unit 10.

[0067] The selected slope receiving unit 42 receives a selected slope 85 selected by specifying an area of ​​a slope 69 on a design plan 84 of the road displayed by the design plan drawing unit 40. The designer specifies an area in which the slope 69 is to be changed to a retaining wall 86 or the gradient of the slope 69 by clicking on the design plan 84. The slope 69 specified in this way becomes the selected slope 85.

[0068] The selected slope highlighting unit 43 highlights the area on the design plan 84 of the selected slope 85 received by the selected slope receiving unit 42. The highlighting may be realized as a display method that allows the area of ​​the selected slope 85 to be visually clearly distinguished from the surrounding areas, for example, by displaying the area of ​​the selected slope 85 with a thick border, displaying the area of ​​the selected slope 85 with a black border, displaying the area with hatching, coloring the area with red or the like, or displaying the area enlarged compared to the surrounding areas.

[0069] FIG. 9 is a schematic diagram showing a design plan 84 of a road in which a selected slope 85 is highlighted. In the design plan 84 of a road displayed by the design plan drawing unit 40, three slopes 69 are designed in the area below the road surface 71 in the drawing. If the slope 69 connected to the current topography 72 is the first step, the slope 69 designed on the road surface 71 side via a berm 70 is the second step, and the slope 69 connected to the road surface 71 via a berm 70 is the third step, the state in which the second step slope 69 has been accepted as the selected slope 85 by the selected slope accepting unit 42 is shown. In this example, the selected slope 85 is highlighted by being outlined with a thick black line.

[0070] As described above, each element constituting the slope 69 of the three-dimensional design model 82 holds information linked to the slope 69, so when a selected slope 85 is specified, all elements of the three-dimensional design model 82 constituting the slope 69 can be extracted and the area of ​​the selected slope 85 is determined. When making a design change to a retaining wall 86 or the like, all elements constituting the selected slope 85 are changed to the retaining wall 86 or the like all at once.

[0071] This selected slope 85 will be redesigned to be a retaining wall 86 or the like. In addition to the method of designating the entire selected slope 85 to be a retaining wall 86 or the like as shown in Figure 9, it is also possible to apply a designation method in which a section is designated along the direction in which the road alignment 61 extends and a portion of the selected slope 85 is changed to a retaining wall 86 or the like.

[0072] When the selected slope 85 is specified, a design change input screen 90 is displayed on the display unit 20 under the control of the control unit 10. FIG. 10(a) is an example of a schematic diagram showing the design change input screen 90 for the selected slope 85. A design change type selection section 91 is provided at the top of this screen 90, and either a "Change to Retaining Wall" selection button 92 or a "Change Slope Gradient" selection button 93 can be selected. When the "Change to Retaining Wall" selection button 92 is selected, the design of the three-dimensional design model 82 is changed so that the selected slope 85 is replaced with a retaining wall 86. When the other "Change Slope Gradient" selection button 93 is selected, the design of the three-dimensional design model 82 is changed so that the gradient of the selected slope 85 is corrected to the gradient input in the change gradient input box 94.

[0073] In the change gradient input box 94, a change gradient is input, which is the gradient of the selected slope 85 after the design change. If a right triangle with the slope 69 as the hypotenuse is assumed, the angle between the vertical side and the horizontal side is a right angle, and the hypotenuse opposite to this right angle is the slope 69. The gradient of the slope 69 is determined by the ratio of the length of the horizontal side to the length of the vertical side (height direction) of this right triangle. In other words, if the length of the vertical side is "1" (the number 1) and the length of the horizontal side is "n", then the vertical side length: horizontal side length = 1:n, and this "n" is the gradient of the slope 69. For example, if "1.5" is input in the change gradient input box 94, the gradient of the slope 69 where the vertical side length: horizontal side length = 1:1.5 is set as the change gradient.

[0074] At the bottom of this design change input screen 90, there are a "Design change" start button 95 and a "Cancel" button 96. When the "Design change" start button 95 is pressed after a change type is selected in the design change type selection section 91, a design change is made to the selected slope 85. On the other hand, when the "Cancel" button 96 is pressed, the design change is not made to the selected slope 85, and the selection of the selected slope 85 is cancelled.

[0075] The change type receiving unit 44 shown in Fig. 2 receives a design change type indicating whether to replace the selected slope 85 with a retaining wall 86 or to change the gradient of the selected slope 85 to a changed gradient. The changed gradient receiving unit 45 also receives a changed gradient based on the control of the control unit 10. The changed gradient is the gradient after the design change of the gradient of the selected slope 85. The change start instruction receiving unit 46 receives a design change start instruction to start the design change of the selected slope 85.

[0076] When the designer selects the "Change to retaining wall" selection button 92 or the "Change slope gradient" selection button 93 in the design change type selection section 91 on the design change input screen 90 for the selected slope 85 shown in Fig. 10(a), the design change type is accepted by the change type acceptance section 44. When the change gradient is input in the change gradient input box 94, it is accepted by the change gradient acceptance section 45. When the designer operates the input section 14 to press the "design change" start button 95, a design change start instruction is input and accepted by the change start instruction acceptance section 46. The design change start instruction is an instruction to start a design change such as replacing the selected slope 85 with a retaining wall 86 or changing the gradient of the selected slope 85.

[0077] 10(b) is another example of the design change input screen 98 for the selected slope 85. This design change input screen 98 is provided with only a change slope input box 99.

[0078] The change gradient is input into this change gradient input box 99, and the input numerical value selects a design change type indicating whether to replace the selected slope 85 with the retaining wall 86, or to change the gradient of the selected slope 85 to the change gradient. Specifically, when a numerical value greater than or equal to 0 and less than 1.0 is input into the change gradient input box 99, the selection is made to replace the selected slope 85 with the retaining wall 86, and when a numerical value greater than or equal to 1.0 is input, the selection is made to change the gradient of the selected slope 85 to the change gradient. This selected design change type is accepted by the change type accepting unit 44.

[0079] Furthermore, when a change gradient having a value of 1.0 or more is input into the change gradient input box 99 , the input change gradient is received by the change gradient receiving unit 45 .

[0080] Furthermore, when a numerical value is entered into this change gradient input box 99, a design change start instruction is generated, and this design change start instruction is accepted by the change start instruction receiving unit 46, and the design change for the selected slope 85 is executed.

[0081] In this way, the selection of the design change type, the input of the change gradient, and the input of a command to start the design change are all performed simultaneously by a single action of inputting a value in the change gradient input box 99. The designer can execute the design change for the selected slope 85 simply by specifying the selected slope 85 on the design plan 84 and inputting a value in the change gradient input box 99, reducing the number of input actions and improving workability.

[0082] Before making any changes to the three-dimensional design model 82 due to a design change, the configuration data of the three-dimensional design model 82 before the change is stored in the before-design-change design model storage unit 48 shown in Fig. 2. This is a measure to enable the three-dimensional design model 82 to be restored to its original state even after the design change.

[0083] Based on the control of the control unit 10, the design modification unit 50 modifies the design of the three-dimensional design model 82 so as to replace the selected slope 85 with a retaining wall 86 or to change the gradient of the selected slope 85 to a modified gradient.

[0084] 11(a) is a schematic diagram of a two-dimensional projected image 83 using a three-dimensional design model 82 after the design of a selected slope 85 has been changed to a retaining wall 86. In this figure, the second slope 69, which is the selected slope 85, has been deleted, and a retaining wall 86 has been designed instead. That is, the boundary between the selected slope 85 and the berm 70 on the road surface 71 side has been changed to the retaining wall 86. In addition, because the second slope 69 is specified as the selected slope 85, the first slope 69 on the side of the current topography 72 has been deleted due to the design change to the retaining wall 86, and the current topography 72 is displayed in the area of ​​the first slope 69.

[0085] The process of changing the selected slope 85 of the 3D design model 82 into a retaining wall 86 is shown below, in which a vertically extending retaining wall 86 is constructed to connect to the existing terrain 72.

[0086] First, a plane extending vertically from the boundary between the selected slope 85 and the berm 70 is obtained. This plane is virtually divided by the width of the adjacent control section line 63 (see FIG. 6), and each divided plane is divided horizontally into small planes each having a long and narrow strip shape of a predetermined width. Hereinafter, these virtually divided small planes are referred to as retaining-wall-constituting small planes 87. These retaining-wall-constituting small planes 87 are used as elements constituting the retaining wall 86 of the three-dimensional design model 82. Furthermore, in order to form the boundary portion between the retaining wall 86 and the current topography 72, data for an extended retaining wall is created by adding and arranging the retaining-wall-constituting small planes 87 so that the retaining wall 86 extends in the vertical direction.

[0087] Next, the intersection line between the retaining wall constituent plane 87 contained in the extended retaining wall data and the current terrain mesh plane 81 of the current terrain 72 is calculated, and this intersection line is used as an element that constitutes the boundary between the retaining wall 86 in the three-dimensional design model 82 and the current terrain 72.

[0088] In addition, in the area where the selected slope 85 was designed, a three-dimensional design model 82 is constructed using a current terrain mesh plane 81 showing the current terrain 72.

[0089] Each element such as the retaining wall constituent facets 87 constituting the retaining wall 86 in the three-dimensional design model 82 is associated with each retaining wall 86, and information about which retaining wall 86 it constitutes is added to each element.

[0090] The control unit 10 causes the design plan drawing unit 40 to display a design plan 84 of the three-dimensional design model 82 of the road, and when the selected slope receiving unit 42 receives a selected slope 85 input by the designer, controls the selected slope highlighting unit 43 to highlight the area of ​​the selected slope 85, and then, when the change start instruction receiving unit 46 receives a design change start instruction, controls the design modification unit 50 to modify the design of the three-dimensional design model 82 so as to replace the selected slope 85 with a retaining wall 86. The configuration data of the three-dimensional design model 82 whose design has been modified in this way is stored in the three-dimensional design model storage unit 30. The result of the design modification of the selected slope 85 to the retaining wall 86 is also reflected in the design data of the road.

[0091] The gradient of the retaining wall 86 is not limited to the vertical direction, and may be set by the designer to any gradient. Also, the area of ​​the slope 69 to be changed to the retaining wall 86 may be set to the boundary with the berm 70 on the road surface 71 side of the selected slope 85 as shown in Figure 11(a), or alternatively, the boundary on the current topography 72 side of the selected slope 85 may be set to be changed to the retaining wall 86.

[0092] In Fig. 11(a), a transverse line 75 is displayed, which is input by a designer and is accepted by the transverse line accepting unit 36 ​​to specify the display position of the road cross section. Fig. 11(b) is a schematic diagram showing a cross section of the road cut along this transverse line 75. This cross section is displayed on the display unit 20 by the cross section drawing unit 38. Compared with Fig. 8(b) above, which shows the cross section before it is changed to a retaining wall 86, the planned cross section 73 shown in Fig. 11(b) has a retaining wall 86 designed at the boundary between the second slope 69, which is the selected slope 85, and the berm 70 on the road surface 71 side.

[0093] In the above explanation, the process of changing the selected slope 85 to the retaining wall 86 has been shown, but the process of changing the gradient of the selected slope 85 to a changed gradient is performed as follows.

[0094] First, the boundary line of the selected slope 85 on the road surface 71 side is set as a reference line. Next, a plurality of slope-composing small planes 80 (see FIG. 6) are arranged along the direction of the changed gradient, starting from this reference line, to form the slope 69. These slope-composing small planes 80 are used as elements that compose the slope 69 of the three-dimensional design model 82 after the design change. The road surface slope information receiving unit 22 shown in FIG. 2 receives a set value for the height of one step (vertical height) of the slope 69, and since a change in the gradient of the selected slope 85 changes the horizontal distance when the selected slope 85 is projected horizontally, the position of the berm 70 is also corrected accordingly.

[0095] Regarding the method of specifying the slope 69 whose slope is to be changed, the slope of only the specified selected slope 85 may be changed to the changed slope, or the design may be modified so that the slopes of multiple slopes 69 connecting the current topography 72, including the selected slope 85, and the road surface 71 are all corrected to the changed slope at once.

[0096] 2 receives a restoration instruction to restore the three-dimensional design model 82, whose design has been changed to a retaining wall 86, to the state before the change. This restoration instruction is input from the input unit 14 by the designer.

[0097] When the restoration instruction receiving unit 52 receives a restoration instruction, the selected slope restoration unit 54 reads out the configuration data of the three-dimensional design model 82 before the change from the three-dimensional design model storage unit 30, and replaces the read out data with the three-dimensional design model 82. In this way, the selected slope 85 is restored to the three-dimensional design model 82 before it was replaced with the retaining wall 86.

[0098] The communication unit 56 transmits and receives data to and from the outside of the design support device 1 via the communication line 9.

[0099] The operations of the digital map request unit 16, digital map reception unit 18, road surface slope information reception unit 22, road alignment reception unit 24, longitudinal section alignment reception unit 26, road design data construction unit 27, three-dimensional design model construction unit 28, three-dimensional design model storage unit 30, projection point coordinate reception unit 32, projection image drawing unit 34, transverse line reception unit 36, transverse section drawing unit 38, design plan drawing unit 40, selected slope reception unit 42, selected slope emphasis unit 43, change type reception unit 44, change gradient reception unit 45, change start instruction reception unit 46, pre-design change design model storage unit 48, design change unit 50, restoration instruction reception unit 52, selected slope restoration unit 54 and other units constituting the design support device 1 described above are executed by the control unit 10 based on the design support program.

[0100] Next, the operation of the design support device 1 according to this embodiment will be described.

[0101] FIG. 12 is a schematic diagram for explaining a flow of creating a three-dimensional design model 82 of a road in the operation of the design support device 1 according to this embodiment.

[0102] A designer operates the design support device 1 to design a road and construct a three-dimensional design model 82, but first, a request is made for a digital map 60 of the design area to the digital map providing server 2 (step S10). When information on the design area and a request for a digital map are sent from the digital map requesting unit 16 of the design support device 1 to the digital map providing server 2 via the communication line 9, the digital map providing server 2, which receives this information, sends the requested digital map 60 data to the design support device 1 (step S30). This digital map 60 data is accepted by the digital map accepting unit 18 of the design support device 1 (step S11). The accepted digital map 60 data is stored in the auxiliary storage means 12, and the control unit 10 constructs the current topography 72, which is a topographical map, as three-dimensional digital data based on the digital map 60 data.

[0103] As described above, a configuration may be adopted in which the digital map requesting unit 16 and the digital map receiving unit 18 are not included in the design support device 1. In this case, prior to creating the three-dimensional design model 82 of the road, data of the digital map 60 is obtained in advance by accessing the digital map providing server 2 using a web browser of a PC, or data of the digital map 60 recorded from a recording medium such as a DVD-ROM is obtained, and the data is stored in the auxiliary storage means 12. Data of the digital map 60 may also be created from a surveying operation or a paper topographical map, and stored in the auxiliary storage means 12. When the three-dimensional design model 82 of the road is created by the design support device 1, the current topography 72, which is a topographical map, is configured as three-dimensional digital data based on the data of the digital map 60 stored in the auxiliary storage means 12.

[0104] Next, when the designer inputs setting values ​​for the cross-sectional shape of the road, such as the width of the roadway 64 and sidewalk 66, the gradient of the slope 69, etc., the road surface slope information receiving unit 22 receives them (step S12), and when the road alignment 61 is input, the road alignment receiving unit 24 receives them (step S13). Next, when the vertical section alignment 68 is input, the vertical section alignment receiving unit 26 receives them (step S14).

[0105] When the setting values ​​used for road design are input in this manner, the road design data configuration unit 27 configures road design data based on the setting values ​​(road design data configuration process, road design data configuration step S15). This road design data is stored in the auxiliary storage means 12. In addition, the three-dimensional design model configuration unit 28 configures a three-dimensional design model 82 based on this road design data (three-dimensional design model configuration process, three-dimensional design model configuration step S16), and the configuration data of the three-dimensional design model 82 is stored in the three-dimensional design model storage unit 30 (step S17).

[0106] The designer checks the design result by displaying a two-dimensional projection image 83 of a three-dimensional design model 82 on the display unit 20. In order to display the two-dimensional projection image 83, the designer inputs the three-dimensional coordinates of a projection point, and the coordinates of the projection point are received by the projection point coordinate receiving unit 32 (projection point coordinate receiving process, projection point coordinate receiving step S18). The projection image drawing unit 34 displays the two-dimensional projection image 83 of the three-dimensional design model 82 viewed from the coordinates of the projection point (projection image drawing process, projection image drawing step S19). An example of the two-dimensional projection image 83 displayed in this manner is shown in FIG. 7.

[0107] To check the cross section of the designed road, the designer inputs a cross section 75 on the two-dimensional projection image 83 (see FIG. 8(a)). The input cross section 75 is received by the cross section receiving unit 36 ​​(cross section receiving process, cross section receiving step S20), and the cross section drawing unit 38 displays a cross section cut from a plan view direction of the road along the cross section 75 (cross section drawing process, cross section drawing step S21) (see FIG. 8(b)).

[0108] Next, an operation of changing the slope 69 into a retaining wall 86 in the design support device 1 will be described.

[0109] FIG. 13 is a schematic diagram for explaining a flow of selecting a slope 69 in a three-dimensional design model 82 of a road and changing the design to a retaining wall 86.

[0110] First, the three-dimensional design model 82 of the road stored in the three-dimensional design model storage unit 30 is extracted (step S40). When the designer inputs the three-dimensional coordinates of the projection point in order to display the two-dimensional projection image 83 of the three-dimensional design model 82, the input is accepted by the projection point coordinates accepting unit 32 (projection point coordinates accepting process, projection point coordinates accepting step S41), and the two-dimensional projection image 83 as viewed from the coordinates of the projection point is displayed (projection image drawing process, projection image drawing step S42).

[0111] Next, when an instruction is input from the designer, the design plan drawing unit 40 displays a design plan 84, which is a plan view of the three-dimensional design model 82 (design plan drawing process, design plan drawing step S43). With reference to the design plan 84, the designer directly specifies on the design plan 84 a slope 69 that the designer feels is too wide for the site, for example, and selects it as a selected slope 85 to be changed to a retaining wall 86. When the selected slope 85 selected in this way is received by the selected slope receiving unit 42 (selected slope receiving process, selected slope receiving step S44), the area of ​​the selected slope 85 is highlighted by the selected slope highlighting unit 43 (selected slope highlighting process, selected slope highlighting step S45) (see FIG. 9).

[0112] When the selected slope 85 is specified, the display unit 20 displays a confirmation of the design change (see FIG. 10(a)). When the designer inputs a design change start instruction to the retaining wall 86, the change start instruction receiving unit 46 receives the instruction (change start instruction receiving process, change start instruction receiving step S46). When the design change start instruction is received, the configuration data of the pre-change three-dimensional design model 82 is stored in the pre-change design model storage unit 48 (step S47), and then the design change unit 50 changes the selected slope 85 to the retaining wall 86 to configure the three-dimensional design model 82 (design change process, design change step S48). Then, the two-dimensional projected image 83 of the design-changed three-dimensional design model 82 is displayed by the projected image drawing unit 34 (projected image drawing process, projected image drawing step S49) (see FIG. 11(a)). The result of the design change of the three-dimensional design model 82 from the selected slope 85 to the retaining wall 86 is also reflected in the design data of the road.

[0113] To check the cross section of the three-dimensional design model 82, the designer inputs a cross section 75 on the two-dimensional projection image 83 (see FIG. 11(a)). The input cross section 75 is received by the cross section receiving unit 36 ​​(cross section receiving process, cross section receiving step S50), and the cross section drawing unit 38 displays a cross section cut from a plan view direction of the road along the cross section 75 (cross section drawing process, cross section drawing step S51) (see FIG. 11(b)).

[0114] If the changed three-dimensional design model 82 is confirmed (Yes in step S52), it is stored in the three-dimensional design model storage unit 30 (step S53). On the other hand, if the changed three-dimensional design model 82 is not confirmed and is returned to the state before the change (No in step S52), a restoration instruction input by the designer is received by the restoration instruction receiving unit 52 (restoration instruction receiving process, restoration instruction receiving step S54), and the selected slope restoration unit 54 reads out the configuration data of the three-dimensional design model 82 before the change from the three-dimensional design model storage unit 30, and replaces the read out data with the three-dimensional design model 82 to restore it (selected slope restoration process, selected slope restoration step S55).

[0115] The above describes the process for changing the design of the slope 69 of the three-dimensional design model 82 of a road to a retaining wall 86 using Figure 13. However, the process for changing the gradient of the slope 69 of the three-dimensional design model 82 is as follows.

[0116] When the selected slope 85 is received in selected slope receiving step S44 in Fig. 13 and the area of ​​the selected slope 85 is highlighted (selected slope highlighting process, selected slope highlighting step S45), a design change input screen 90 is displayed on the display unit 20 (see Fig. 10(a)). When the designer selects the "change slope gradient" selection button 93 on this screen 90 and inputs the changed gradient in the changed gradient input box 94, the input changed gradient is received by the changed gradient receiving unit 45 (changed gradient receiving process, changed gradient receiving step). Thereafter, when the designer presses the "design change" start button 95, a design change start instruction is accepted by the change start instruction accepting unit 46 (change start instruction accepting process, change start instruction accepting step S46), and the configuration data of the pre-change three-dimensional design model 82 is stored in the pre-design change design model storage unit 48 (step S47), after which the design change unit 50 makes a design change to correct the gradient of the selected slope 85 to the changed gradient, and the three-dimensional design model 82 is constructed (design change process, design change step S48).

[0117] Next, the effects of this embodiment will be described.

[0118] According to this embodiment, a design plan 84 is displayed using a three-dimensional design model 82 of a road, and a design change is made so that a selected slope 85 selected on the design plan 84 is replaced with a retaining wall 86. In this way, the slope 69 of the three-dimensional design model 82 can be directly selected on the design plan 84 and easily changed to a retaining wall 86.

[0119] Furthermore, according to this embodiment, a design plan 84 is displayed using a three-dimensional design model 82 of a road, and the design is changed so that the gradient of a selected slope 85 selected on the design plan 84 is corrected to a changed gradient. In this way, the gradient of a slope 69 of the three-dimensional design model 82 can be easily changed by directly selecting it on the design plan 84.

[0120] Furthermore, according to this embodiment, a two-dimensional projected image 83 of a three-dimensional design model 82 is displayed, and when a transverse line 75 that cuts a slope 69 is set on the two-dimensional projected image 83, a transverse cross-sectional view is displayed along the transverse line 75. In this manner, a transverse cross-sectional view of the three-dimensional design model 82 can be easily displayed. Furthermore, after a design change is made to the slope 69, a transverse cross-sectional view after the design change can be displayed.

[0121] Furthermore, according to this embodiment, the slope 69 to be changed is highlighted, making it easy to visually confirm, and thus preventing erroneous design changes.

[0122] Furthermore, according to this embodiment, even after a design change, the slope 69 can be restored to its pre-change state, allowing the designer to design with peace of mind knowing that the design change can be redone. [Explanation of symbols]

[0123] 1...design support device, 2...digital map providing server, 9...communication line, 10...control unit, 12...auxiliary storage means, 14...input unit, 16...digital map request unit, 18...digital map reception unit, 20...display unit, 22...road surface slope information reception unit, 24...road alignment reception unit, 26...longitudinal section alignment reception unit, 27...road design data construction unit, 28...three-dimensional design model construction unit, 30...three-dimensional design model storage unit, 32...projection point coordinate reception unit, 34...projection image drawing unit, 36...transverse line reception unit, 38...transverse section drawing unit, 40...design plan drawing unit, 42...selected slope reception unit, 43...selected slope emphasis unit, 44...change type reception unit, 45...changed gradient reception unit, 46... change start instruction receiving unit, 48...design model memory unit before design change, 50...design change unit, 52...restoration instruction receiving unit, 54...selected slope restoration unit, 56...communication unit, 60...digital map, 61...road alignment, 62...measurement point, 63...control section line, 64...roadway, 65...road shoulder, 66...sidewalk, 67...current longitudinal section, 68...longitudinal alignment, 69...slope, 70...bench, 71...road surface, 72...current terrain, 73...planned cross section, 74...current cross section, 75...cross line, 80...slope composition small plane, 81...current terrain mesh plane, 82...three-dimensional design model, 83...two-dimensional projection image, 84...design plan, 85...selected slope, 86...retaining wall, 87...retaining wall composition small plane

Claims

1. A design support device for designing a three-dimensional design model of an earthwork structure, comprising: a design plan drawing unit that displays a plan view of an earthwork structure using a three-dimensional design model of the earthwork structure having a slope; a selected slope receiving unit that receives a selected slope selected by designating an area of ​​the slope on a displayed plan view of the earthwork structure; a design modification unit that modifies the design of the three-dimensional design model so as to replace the selected slope with a retaining wall; A design support device characterized by comprising a control unit that causes the design plan drawing unit to display a plan view of the earthwork structure, and when the selected slope receiving unit receives the selected slope, controls the operation of the design modification unit to make the design changes to the selected slope received.

2. A design support device for designing a three-dimensional design model of an earthwork structure, comprising: a design plan drawing unit that displays a plan view of an earthwork structure using a three-dimensional design model of the earthwork structure having a slope; a selected slope receiving unit that receives a selected slope selected by designating an area of ​​the slope on a displayed plan view of the earthwork structure; a change gradient receiving unit that receives a change gradient, which is a gradient after the change of the selected slope; a design modification unit that modifies the design of the three-dimensional design model so as to change the gradient of the selected slope to the modified gradient; a control unit that causes the design plan drawing unit to display a plan view of the earthwork structure, receives the selected slope in the selected slope receiving unit, and receives the changed slope in the changed gradient receiving unit, and controls the operation of making the design change to the selected slope received in the design change unit.

3. a projection image drawing unit for displaying a two-dimensional projection image of the three-dimensional design model viewed from an arbitrary projection point; a projection point coordinate receiving unit that receives projection point coordinates that are three-dimensional coordinates of the projection point; a transverse line receiving unit that receives a transverse line set for the two-dimensional projection image to be displayed so as to cut the selected slope on a plane including a tilt direction of the selected slope from a plan view direction of the earthwork structure; a cross-sectional view drawing unit that displays a cross-sectional view of the selected slope along the cross-sectional line from a plan view direction of the earthwork structure, The control unit is when the projection point coordinates are received by the projection point coordinate receiving unit, the projection image drawing unit is caused to display the two-dimensional projection image of the three-dimensional design model as viewed from the received projection point coordinates, and when the cross-sectional line receiving unit receives the cross-sectional line, the cross-sectional line drawing unit is caused to display the cross-sectional line; 3. The design support device according to claim 1, wherein after the design modification unit executes the design modification of the selected slope, the cross-sectional view after the design modification is displayed.

4. a selected slope highlighting unit that highlights an area of ​​the selected slope in a plan view of the earthwork structure that is displayed; a change start instruction receiving unit that receives a design change start instruction to start the design change of the selected slope, The control unit is When the selected slope receiving unit receives the selected slope, the selected slope highlighting unit highlights the area of ​​the selected slope, The design support device according to claim 3, characterized in that after the highlighted display, when the change start instruction receiving unit receives the design change start instruction, the design change unit is controlled to make the design change to the selected slope.

5. a selected slope restoration unit that restores the selected slope to the three-dimensional design model before the design change; A restoration instruction receiving unit that receives a restoration instruction, The control unit is The design support device according to claim 4, characterized in that when the restoration instruction receiving unit receives the restoration instruction, the selected slope restoration unit restores the three-dimensional design model so as to return the selected slope to its state before the design change.

6. A design support program that operates on a design support device that designs a three-dimensional design model of an earthwork structure, a design plan drawing process for displaying a plan view of an earthwork structure having a slope using a three-dimensional design model of the earthwork structure; a selected slope receiving process for receiving a selected slope selected by designating an area of ​​the slope on a displayed plan view of the earthwork structure; and a design modification process for modifying the design of the three-dimensional design model so as to replace the selected slope with a retaining wall, A design support program characterized in that, after displaying a plan view of the earthwork structure in the design plan drawing process, when the selected slope is accepted in the selected slope acceptance process, the design change process is performed on the selected slope.

7. A design support program that operates on a design support device that designs a three-dimensional design model of an earthwork structure, a design plan drawing process for displaying a plan view of an earthwork structure having a slope using a three-dimensional design model of the earthwork structure; a selected slope receiving process for receiving a selected slope selected by designating an area of ​​the slope on a displayed plan view of the earthwork structure; A changed slope receiving process receives a changed slope, which is a slope after the change of the selected slope; and a design change process for changing a design of the three-dimensional design model so as to change a gradient of the selected slope to the changed gradient, A design support program characterized in that, after displaying a plan view of the earthwork structure in the design plan drawing process, the selected slope is accepted in the selected slope acceptance process, and the changed slope is accepted in the changed gradient acceptance process, and then the design change is made to the selected slope accepted by the design change process.

8. a projection image drawing process for displaying a two-dimensional projection image of the three-dimensional design model viewed from an arbitrary projection point; a projection point coordinate receiving process for receiving projection point coordinates which are three-dimensional coordinates of the projection point; a transverse line receiving process for receiving a transverse line that is set so as to cut the selected slope on a plane including a tilt direction of the selected slope from a plan view direction of the earthwork structure in the two-dimensional projection image to be displayed; a cross-sectional view drawing process for displaying a cross-sectional view of the selected slope along the cross-sectional line from a plan view direction of the earthwork structure, when the projection point coordinates are received in the projection point coordinate receiving process, the two-dimensional projection image of the three-dimensional design model as viewed from the received projection point coordinates is displayed in the projection image drawing process, and when the cross-sectional line is received in the cross-sectional line receiving process, the cross-sectional view is displayed in the cross-sectional view drawing process; 8. The design support program according to claim 6, wherein after the design change of the selected slope is executed in the design change process, the cross-sectional view after the design change is displayed.

9. a selected slope highlighting process for highlighting an area of ​​the selected slope in a plan view of the earthwork structure; a change start instruction receiving process for receiving a design change start instruction for starting the design change of the selected slope, When the selected slope is received in the selected slope receiving process, the area of ​​the selected slope is highlighted in the selected slope emphasizing process; 9. The design support program according to claim 8, wherein after the highlighted display, when the design change start instruction is received in the change start instruction receiving process, the design change of the selected slope is performed by the design change processing.

10. A selected slope restoration process for restoring the selected slope to the three-dimensional design model before the design change; A restoration instruction receiving process for receiving a restoration instruction, A design support program as described in claim 9, characterized in that when the restoration instruction receiving process receives the restoration instruction, the three-dimensional design model is restored by the selected slope restoration process so as to return the selected slope to its state before the design change.

11. A design support method for use in a design support device that designs a three-dimensional design model of an earthwork structure, comprising: a design plan drawing step of displaying a plan view of the earthwork structure using a three-dimensional design model of the earthwork structure having a slope; a selected slope receiving step of receiving a selected slope selected by designating an area of ​​the slope on a displayed plan view of the earthwork structure; a design modification step of modifying the design of the three-dimensional design model so as to replace the selected slope with a retaining wall; A design support method characterized in that after a plan view of the earthwork structure is displayed in the design plan drawing step, the selected slope is accepted in the selected slope acceptance step, and the design change step makes the design change to the selected slope accepted.

12. A design support method for use in a design support device that designs a three-dimensional design model of an earthwork structure, comprising: a design plan drawing step of displaying a plan view of the earthwork structure using a three-dimensional design model of the earthwork structure having a slope; a selected slope receiving step of receiving a selected slope selected by designating an area of ​​the slope on a displayed plan view of the earthwork structure; a change gradient receiving step of receiving a change gradient which is a gradient after the change of the selected slope; and a design modification step of modifying a design of the three-dimensional design model so as to change a gradient of the selected slope to the changed gradient, A design support method characterized in that after displaying a plan view of the earthwork structure in the design plan drawing step, the selected slope is accepted in the selected slope acceptance step, and the changed slope is accepted in the changed gradient acceptance step, and then the design change is made to the selected slope accepted in the design change step.

13. a projection image drawing step of displaying a two-dimensional projection image of the three-dimensional design model viewed from an arbitrary projection point; a projection point coordinate receiving step of receiving projection point coordinates which are three-dimensional coordinates of the projection point; a transverse line receiving step of receiving a transverse line that is set so as to cut the selected slope on a plane including a tilt direction of the selected slope from a plan view direction of the earthwork structure in the two-dimensional projection image to be displayed; a cross-sectional view drawing step of displaying a cross-sectional view cutting the selected slope along the cross-sectional line from a plan view direction of the earthwork structure, When the projection point coordinates are received in the projection point coordinate receiving step, the two-dimensional projection image of the three-dimensional design model as viewed from the received projection point coordinates is displayed in the projection image drawing step, and when the transverse line is received in the transverse line receiving step, the transverse cross-sectional view drawing step displays the transverse cross-sectional view; 13. The design support method according to claim 11, wherein after the design change of the selected slope is carried out in the design change step, the cross-sectional view after the design change is displayed.

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