Tunnel portal design support system and tunnel portal design support program

Abstract

To enable quick and appropriate examination of a tunnel pit mouth position.SOLUTION: A tunnel pit mouth examination support system 1 comprises: an input portion 10a receiving inputs of a road planning line, a tunnel cross section, a face wall, and a back cut slope; a calculation portion 10b calculating an overburden area based on a current topography and the tunnel cross section inputted into the input portion 10a; a display control portion 10c making a display portion 11 display the road planning line, the face wall, a slope line of the back cut, and the overburden area; and an operation portion 12 for moving the face wall in a direction along the road planning line on the display portion 11. The display control portion 10c detects the moving operation of the face wall by the operation portion 12, and makes the display portion 11 display the face wall in a state in which the face wall is moved in the direction along the road planning line according to the detected moving operation.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a tunnel portal consideration support system and a tunnel portal consideration support program capable of determining the portal position of a tunnel on CAD.

Background Art

[0002] In recent years, 3D CAD systems have been introduced in various fields for design work. In the field of road design, 3D CAD systems have also been introduced. For example, Patent Document 1 discloses a retaining wall automatic placement device for automatically placing a retaining wall model on a 3D road model. Patent Document 2 discloses a retaining wall stability inspection device that executes a process for inspecting the stability of a retaining wall on a 3D road model.

[0003] The automatic placement device of Patent Document 1 identifies the placement section of the retaining wall based on the distance between the center line and the normal plane on the 3D road model. For the identified placement section, a reference line for placing the retaining wall is set, and the retaining wall shape as a placement candidate is placed in accordance with the reference line, and then the adjustment of the retaining wall height can be automatically executed.

[0004] The stability inspection device of Patent Document 2 is configured to change the color of the retaining wall on the 3D road model based on the result of the stability inspection after accepting the selection of the retaining wall to be inspected for stability on the 3D road model and executing the stability inspection process of the target retaining wall.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, when designing a tunnel using a 3D road design CAD system, the shape of the tunnel face walls is automatically determined by inputting numerical values ​​such as the width and height of the tunnel face walls. However, if the shape of the face walls is determined only by inputting numerical values ​​such as width and height, the 3D terrain of the site is not taken into consideration, and the calculation of retaining wall height is not performed, resulting in a problem where the shape of the face walls cannot be accurately determined.

[0007] Furthermore, in conventional tunnel design, the approximate location of the tunnel entrance was considered using two-dimensional longitudinal and plan drawings, and only after drawing the cut slope behind the tunnel using a two-dimensional plan drawing was the final confirmation of whether the tunnel entrance location was optimal was made. However, drawing the cut slope behind the tunnel could only be done manually using CAD, and it was highly dependent on the skill of the worker, resulting in poor accuracy. Therefore, it took a long time to confirm whether the tunnel entrance had been determined to be in the optimal location.

[0008] Tunnels, in particular, are high-cost structures in road design, and there is a demand to shorten them by several meters. However, simply shortening them often leads to large cuts behind the tunnel, posing safety problems, making it difficult to balance cost and safety. Therefore, a system is needed to quickly and appropriately consider the location of the tunnel portal.

[0009] This disclosure is made in view of the above points, and its purpose is to enable the quick and appropriate examination of tunnel portal locations. [Means for solving the problem]

[0010] To achieve the above objective, one aspect of this disclosure may be based on a tunnel portal design support system used when determining the location of a tunnel portal. The tunnel portal design support system includes a display unit capable of displaying drawings, an input unit that accepts input of a road plan line, a tunnel cross-section, a face wall, and a backfill cut slope, a calculation unit that calculates a display line indicating the overburden area based on the tunnel cross-section input by the input unit, a display control unit that causes the display unit to display the road plan line input by the input unit, the face wall input by the input unit, the backfill cut slope line input by the input unit, and the display line calculated by the calculation unit, and an operation unit on the display unit for moving the face wall in the direction along the road plan line. The display control unit is configured to detect the movement operation of the face wall by the operation unit and to display the face wall on the display unit in the state where the face wall has been moved in the direction along the road plan line according to the detected movement operation.

[0011] In this configuration, the gradient line of the backfill cut, the overburden area, and the face wall located at the end of the tunnel are displayed on the display unit. Since the tunnel entrance opens into the face wall, the position of the tunnel entrance can be confirmed based on the position of the face wall. In addition, the thickness of the soil above the tunnel can be confirmed based on the overburden area, making it possible to understand the appropriate positional relationship between the overburden area and the tunnel entrance. Furthermore, the relative position of the gradient line of the backfill cut and the face wall can be confirmed, making it possible to understand the appropriate positional relationship between the backfill cut and the tunnel entrance. When the user of this system moves the face wall on the display unit in the direction of the road plan line using the operation unit, the movement of the face wall in that direction is displayed on the display unit. Therefore, by changing the position of the face wall, i.e. the position of the tunnel entrance, the positional relationship between the tunnel entrance, the overburden area, and the backfill cut can be understood, making it possible to determine the appropriate position of the tunnel entrance on CAD.

[0012] In other embodiments of the present disclosure, the display control unit can display the planned road line, the face wall, the slope line of the backfill cut, the overburden area, and the current topography as a longitudinal section along the planned road line on the display unit, making it easy to confirm the thickness of the soil above the tunnel and the slope of the backfill cut.

[0013] Furthermore, the display control unit can also display the current terrain, the tunnel cross-section, and the facing wall as orthogonal cross-sections perpendicular to the planned road line on the display unit.

[0014] Furthermore, the input unit may be configured to accept input of measurement points. In this case, the display control unit can generate the orthogonal cross-section corresponding to the measurement point received by the input unit and display it on the display unit.

[0015] Furthermore, the input unit may be configured to accept input of attributes of the retaining wall in the orthogonal cross-section at the tunnel entrance. In this case, the calculation unit can acquire the shape of the retaining wall based on the attributes input by the input unit and determine the retaining wall height by performing an intersection calculation between the current terrain and the retaining wall.

[0016] Furthermore, the calculation unit can also adjust the width of the face wall based on the calculated retaining wall height, thereby providing a face wall of an appropriate width.

[0017] Furthermore, the tunnel portal design support program causes a computer to perform the following steps: an input step that accepts input of a planned road line, tunnel cross-section, face wall, and backfill cut slope; a calculation step that calculates a display line indicating the overburden area based on the tunnel cross-section input in the input step; and a display step that displays the planned road line, face wall, backfill cut slope line, and display line calculated in the calculation step on the display unit. When the user moves the face wall in the direction of the planned road line on the display unit, the display unit can display the face wall in the direction of the planned road line in accordance with the movement operation.

[0018] Furthermore, a tunnel portal design support method used when determining the location of a tunnel portal can also be used as a basis. This method includes an input step of receiving input of a road plan line, tunnel cross-section, face wall, and backfill cut slope; a calculation step of a display line indicating the overburden area based on the tunnel cross-section input in the input step; a display step of displaying the road plan line input in the input step, the face wall input in the input step, the backfill cut slope line input in the input step, and the display line calculated in the calculation step on the display unit; and an operation step of moving the face wall in the direction along the road plan line on the display unit, and the face wall can be displayed on the display unit while it is moved in the direction along the road plan line according to the movement operation. [Effects of the Invention]

[0019] As explained above, the face wall where the tunnel portal opens, the slope line of the backfill cut, and the overburden area are displayed on the display unit, and the face wall can be moved along the planned road line, allowing for quick and accurate determination of the tunnel portal location. [Brief explanation of the drawing]

[0020] [Figure 1]It is a configuration diagram of a tunnel portal examination support system according to an embodiment of the present invention. [Figure 2] It is a block diagram of a tunnel portal examination support system. [Figure 3] It is a diagram showing an example of a three-dimensional road model. [Figure 4] It is a sectional view taken along line IV-IV in FIG. 3. [Figure 5] It is a flowchart showing a generation procedure of a three-dimensional road model. [Figure 6] It is a diagram showing an example of a road center line shape. [Figure 7] It is a diagram showing an example of a user interface screen for setting a road width. [Figure 8] It is a flowchart showing a tunnel portal examination procedure. [Figure 9] It is a diagram showing an example of a user interface screen for examining the installation of a portal. [Figure 10] It is a diagram showing an example of a longitudinal section diagram displayed on a display unit. [Figure 11] It is a diagram showing an example of a user interface screen displayed at the time of confirmation. [Figure 12] It is a diagram showing an example of a user interface screen displayed when setting the retaining wall height of a retaining wall. [Figure 13] It is a diagram showing an example of a user interface screen displayed when setting spillage, side walls, and backfill excavation. [Figure 14] It is an example of a three-dimensional plane model generated by a calculation unit.

Embodiments for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Note that the following description of the preferred embodiments is essentially only illustrative and is not intended to limit the present invention, its applications, or its uses.

[0022] <Figure 1 is a configuration diagram of the tunnel portal design support system 1 according to an embodiment of the present invention, and Figure 2 is a block diagram of the tunnel portal design support system 1. The tunnel portal design support system 1 is a system used when determining the location of a tunnel portal and is composed of a personal computer. The tunnel portal design support system 1 comprises a main unit 10, a display unit 11, an operation unit 12, and a storage device 13. The main unit 10 has a control unit 10A and a communication module 10B. The control unit 10A is composed of, for example, a CPU (central processing unit), ROM and RAM (memory), and operates according to a program. The memory is a work memory for loading the program when the CPU executes the tunnel portal design support program, and a buffer memory for temporarily storing data. The communication module 10B is a part that communicates with an external terminal, for example via the internet, and is configured to transmit and receive data.

[0023] The control unit 10A comprises the input unit 10a, calculation unit 10b, display control unit 10c, etc., which will be described later. The input unit 10a, calculation unit 10b, and display control unit 10c may consist only of the hardware that constitutes the control unit 10A, or they may consist of a combination of hardware and software. For example, by having the CPU execute a tunnel portal design support program, the control unit 10A can realize the functions of the input unit 10a, calculation unit 10b, and display control unit 10c.

[0024] The display unit 11 is composed of, for example, a liquid crystal display device or an organic EL display device. The display unit 11 is connected to the control unit 10A and controlled by the control unit 10A and the display control unit 10c, enabling the display of various setting screens, input screens, design screens, analysis screens, etc.

[0025] The operation unit 12 consists of equipment for the user to operate the tunnel portal design support system 1. The operation unit 12 includes, for example, a keyboard 12a and a mouse 12b, but may also include a touch operation panel integrated into the display unit 11, various pointing devices, etc. The operation unit 12 is connected to the control unit 10A, and the control unit 10A can detect operations performed by the user on the operation unit 12.

[0026] The storage device 13 consists of a hard disk drive, solid-state drive, or the like, capable of storing various data and programs. The storage device 13 is connected to the control unit 10A and, in accordance with instructions from the control unit 10A, stores incoming data and reads stored data. The storage device 13 may be built into the main unit 10 or provided outside the main unit 10. Alternatively, the storage device 13 may be an external server or a so-called cloud-type storage system. Furthermore, only a portion of the storage device 13 may be built into the main unit 10, with the rest provided externally.

[0027] The storage device 13 stores a tunnel portal design support program that causes a computer to execute each of the processes described later. The form in which this tunnel portal design support program is provided to the user is not particularly limited; for example, as shown in Figure 1, it may be provided to the user on a recording medium A such as a CD-ROM or DVD-ROM, or it may be provided to the user in a form that can be downloaded from an external server via the internet, etc. By installing the provided tunnel portal design support program on a general-purpose personal computer, the personal computer can be used as the tunnel portal design support system 1.

[0028] Furthermore, when installing the tunnel portal design support program on a general-purpose personal computer, it should be installed on storage device 13. Additionally, by having the general-purpose personal computer access an external server where the tunnel portal design support program is installed, it can be used as the tunnel portal design support system 1; therefore, the installation location of the tunnel portal design support program is not particularly limited.

[0029] The Tunnel Portal Design Support System 1 is a system that uses software to support road design to create a 3D road model 100, as shown in Figure 3 as an example, and to support the determination of the tunnel portal location. The data constituting the 3D road model 100 is stored, for example, in a storage device 13. The control unit 10A reads the data from the storage device 13 and converts it into an image representing the 3D road model 100, as shown in Figure 3, and displays it on the display unit 11. This allows the user to view the 3D road model 100 on the display unit 11. The 3D road model 100 can be shown in plan view, side view, cross view, and longitudinal section view. The 3D road model is represented as a color image.

[0030] As shown in Figure 4, the 3D road model 100 has a main road 101, a ramp (connecting road) 102, a side road 103, and a general road 104. The main road 101 is a wide road, such as an expressway. The ramp 102 is a road that connects the main road 101 and the general road 104, and is narrower than the main road 101, and in the section shown in Figure 3, it is located below the main road 101. The ramp 102 also slopes upward towards the point where it merges with the main road 101 and approaches the main road 101. The side road 103 is located below the ramp 102.

[0031] Since ramp 102 is located below the main road 101, an embankment 105 is formed between the main road 101 and ramp 102. Also, a flat embankment 106 is formed between the embankment 105 and ramp 102. An embankment 107 and a retaining wall 110 are formed between ramp 103 and side road 103. An embankment 109 is formed on the side of side road 103 opposite the retaining wall 110.

[0032] The 3D road model 100 shown in Figure 3 can be generated using conventionally known road design CAD (software). Specifically, the 3D road model 100 can be generated by using the tunnel portal design support system 1, which has road design CAD software installed, and following the steps in the flowchart shown in Figure 5.

[0033] In step SA1 after the start, the system accepts user input for the road centerline. The road centerline, also known as the road plan line, is composed of a combination of elements such as straight lines, arcs, and clothoid curves, as shown in Figure 6 as an example. The starting and ending points are fixed, and the points that must be passed through between them are also fixed. The area between these fixed points is composed of the combination of the above elements.

[0034] When inputting the road centerline alignment, the user operates the operation unit 12. The operation performed on the operation unit 12 is detected by the input unit 10b of the control unit 10A. The input unit 10b accepts the input of the road centerline alignment by detecting the operation on the operation unit 12. In the example shown in Figure 3, there is a main road 101, a ramp 102, and a side road 103, so the input unit 10b accepts input of the road centerline alignments for each of the main road 101, ramp 102, and side road 103. In other words, the input unit 10b is configured to accept input of a first road centerline alignment and a second road centerline alignment that are different from each other, thereby enabling the generation of a 3D road model 100 that assumes multiple alignments. Note that only one road centerline alignment may be input.

[0035] Step SA2 accepts user input of longitudinal and transverse gradients. Input of longitudinal and transverse gradients may be done via a screen input method using diagrams showing the longitudinal end face shape and the cross-sectional shape, or via a numerical input method where the gradient is entered numerically for each measurement point. In either case, the input unit 10b accepts input of longitudinal and transverse gradients by detecting the operation of the operation unit 12.

[0036] Step SA3 accepts user settings for road width. The road width can be entered, for example, using the road width setting user interface screen 200 shown in Figure 7. The control unit 10A generates the road width setting user interface screen 200 and displays it on the display unit 11. The road width setting user interface screen 200 has multiple input fields 201 that allow individual input of road classification, number of diagonal lines, median strip, median strip, side strip, width of each lane, shoulder width, etc. Any numerical value can be entered into each input field 201 by operating the operation unit 12. The input unit 10b detects the operation of the operation unit 12, accepts the road width input, and sets the entered road width.

[0037] In step SA4, the calculation unit 10b generates a 3D road surface model that constitutes the 3D road model. In the 3D road surface model, the road surfaces of the main road 101, ramp 102, and side road 103 are displayed as 3D models. Plan views, side views, longitudinal sections, cross sections, etc., can also be generated by the calculation unit 10b.

[0038] Next, the tunnel portal design procedure will be explained based on the flowchart shown in Figure 8. In step SB1 after the start, user input of the tunnel cross-section, face wall, and backfill slope is received. Step SB1 and step SA1 shown in Figure 5 constitute an input process that receives input of the road plan, tunnel cross-section, face wall, and backfill slope.

[0039] When inputting the tunnel cross-section, face wall, and backfill cut slope, this can be done, for example, using the tunnel entrance installation study user interface screen 200 shown in Figure 9. The control unit 10A or the display control unit 10c generates the tunnel entrance installation study user interface screen 200 and displays it on the display unit 11. The tunnel entrance installation study user interface screen 200 includes a start / end point selection area 201, a measurement point input area 202, a tunnel internal cross-section setting area 203, a face wall setting area 204, and a backfill cut slope setting area 205. The start / end point selection area 201 is for selecting whether to set the face wall and backfill cut on the start or end side of the tunnel; in this example, the start side is selected. The measurement point input area 202 is for inputting measurement points, and it is possible to input any measurement points, for example, at 1m intervals.

[0040] The measurement points entered into the measurement point input area 202 are received by the input unit 10a. When the input unit 10a receives the input of a measurement point, the display control unit 10c generates a cross-sectional view of the location corresponding to the measurement point received by the input unit 10a and displays the generated cross-sectional view on the display unit 11.

[0041] The tunnel internal cross-section setting area 203 is an area for inputting various dimensions related to the tunnel's cross-section. The tunnel internal cross-section setting area 203 includes fields for setting the height of the upper half of the tunnel, a field for setting the height of the lower half of the tunnel, and a field for setting the dimensions FH to SL, for example, with the unit being meters. In addition, the tunnel internal cross-section setting area 203 can also accept input of various values ​​for setting the size and shape of the tunnel's cross-section.

[0042] The face wall setting area 204 is an area for inputting the shape and dimensions of the face wall on the side set in the start / end point selection area 201. The face wall setting area 204 includes fields for setting the clearance dimension on the top surface of the face wall, a field for setting the dimension from the top of the interior space to the top of the tunnel portal, a field for setting the thickness of the face wall, and a field for setting the clearance width between the back of the tunnel portal and the entrance to the tunnel, etc., for example, the unit is meters. In addition, the face wall setting area 204 can accept input of various values ​​for setting the size and shape of the tunnel face wall.

[0043] The backfill cut slope setting area 205 is an area for inputting the slope of the backfill cut on the side set in the start / end point selection area 201. The slope can be input numerically. The input unit 10a receives input of the tunnel cross-section, face wall, and backfill cut slope by detecting the operation of the operation unit 12, and sets the input tunnel cross-section, face wall, and backfill cut slope.

[0044] Once step SB1 is completed, the calculation unit 10b calculates a display line 302 (shown in Figure 10) indicating the overburden area based on the tunnel cross-section input by the input unit 10a. This process constitutes the calculation process. More specifically, as shown in Figure 10, the line 300 indicating the shape of the current terrain is acquired by the calculation unit 10b after going through the 3D road model creation flow shown in Figure 5. The shape of the face wall 301 is also acquired by the calculation unit 10b after going through step SB1. The display line 302 indicating the overburden area can also be a line indicating the position of the top surface of the tunnel, and this display line 302 is also acquired by the calculation unit 10b after going through step SB1. The line 303 indicating the backfill cut is also acquired by the calculation unit 10b after going through step SB1. Furthermore, the road centerline alignment 305 is acquired by the calculation unit 10b after going through step SA1 of the flowchart shown in Figure 5. The area between line 300, which shows the shape of the current terrain, and line 302, which shows the position of the tunnel's top surface, is the overburden area. The overburden area indicates the thickness of the soil covering the top surface of the tunnel.

[0045] The display control unit 10c displays the road centerline alignment 305 input by the input unit 10a, the face wall 301 input by the input unit 10a, the slope line of the backfill cut (indicated by reference numeral 303) input by the input unit 10a, and the display line 302 calculated by the calculation unit 10b on the display unit 11. This process is the display process. At this time, the display control unit 10c displays the road centerline alignment 305, the face wall 301, the slope line of the backfill cut 303, the display line 302, and the line 300 indicating the shape of the current terrain as a longitudinal section along the road centerline alignment 305 on the display unit 11. This section is called a longitudinal section, and the user can check the face wall 301, the current terrain, the overburden area, the backfill cut, etc. by looking at the longitudinal section displayed on the display unit 11.

[0046] In step SB2, the user tentatively determines the position of the face wall 301 while checking the face wall 301, backfill cut, and overburden area using the longitudinal section diagram displayed on the display unit 11. Specifically, the user uses the operation unit 12 to move the face wall 301 on the display unit 11 in a direction along the road centerline 305. In the example shown in Figure 10, since the road centerline 305 extends in the left-right direction, if the face wall 301 is clicked (selected) with the mouse 12b, moving the mouse 10b to the right will move the face wall 301 to the right on the display unit 11, and conversely, moving it to the left will move the face wall 301 to the left on the display unit 11. At this time, the height of the face wall 301 relative to the road centerline 305 does not change, so that there is no relative vertical movement of the face wall 301 relative to the road centerline 305. In other words, the display control unit 10c is configured to detect the movement operation of the wall face 301 by the operation unit 12 and to display the wall face 301 on the display unit 11 in the direction aligned with the road center alignment 305 according to the detected movement operation. This allows the user to arbitrarily change the position of the wall face 301 in the direction aligned with the road center alignment 305 on the display unit 11. Since the tunnel entrance opens on the outer surface of the wall face 301, the position of the tunnel entrance can be determined by the position of the outer surface of the wall face 301.

[0047] After the position of the face wall 301 is tentatively determined in step SB2, the process proceeds to step SB3. In step SB3, as shown in Figure 11, the user confirms the condition of the face wall 301 and the current terrain using a cross-sectional view. The cross-section is an orthogonal cross-section perpendicular to the road centerline 305. Figure 11 shows the user interface screen 330 that the display control unit 10c generates and displays on the display unit 11 when the user confirms the condition of the face wall 301 and the current terrain. The user interface screen 330 is provided with a cross-section display area 331 where the cross-sectional view is displayed. The cross-section display area 331 displays lines 300 indicating the shape of the current terrain, the face wall 301, the road centerline 305, and the cross-sectional shape T of the tunnel. In other words, the display control unit 10c can display the current terrain, the tunnel cross-section, and the face wall on the display unit 11 as an orthogonal cross-section perpendicular to the road centerline.

[0048] By viewing the cross-sectional view displayed in the cross-sectional display area 331, the user can check the condition of the face wall 301 and the current terrain, and determine whether the condition of the face wall 301 and the current terrain is good or bad. In step SB4, the user determines whether the condition of the face wall 301 and the current terrain is good or bad. If the condition of the face wall 301 and the current terrain is not good, the user proceeds to step SB5. For example, as shown in Figure 11, if the lower right side of the tunnel T is exposed from the current terrain, the user determines that the condition of the face wall 301 and the current terrain is not good and proceeds to step SB5, where the user inputs a measurement point in the measurement point input area 332 provided on the user interface screen 330. In other words, the input unit 10a is configured to accept the input of measurement points.

[0049] The display control unit 10c generates a cross-section corresponding to the measurement point received by the input unit 10a and displays it on the display unit 11. For example, if a measurement point shifted 1m from the currently displayed cross-section is input, the display control unit 10c generates a cross-section at the input measurement point and displays it in the cross-section display area 331. This makes it possible to adjust the tunnel entrance position (face wall position) while viewing the current terrain in the cross-section without having to return to the longitudinal section shown in Figure 10. Alternatively, the tunnel entrance position can be adjusted by returning to the longitudinal section shown in Figure 10.

[0050] If the condition of the face wall 301 and the current terrain is determined to be good in step SB4, the process proceeds to step SB6. In step SB6, the retaining wall is set up, and the retaining wall height of the retaining wall is calculated by cross-calculating with the current terrain. Figure 12 is a user interface screen 330 that the display control unit 10c generates and displays on the display unit 11 when calculating the retaining wall height of the retaining wall 340. The user interface screen 330 is provided with a left retaining wall setting area 341 for setting the left retaining wall and a right retaining wall setting area 342 for setting the right retaining wall. The left retaining wall setting area 341 is configured to allow individual setting of the width, slope, top width, etc. of the retaining wall installed on the left side of the diagram displayed in the cross-sectional display area 331. The right retaining wall setting area 342 is configured to allow individual setting of the width, slope, top width, etc. of the retaining wall installed on the right side of the diagram displayed in the cross-sectional display area 331. Numerical values ​​can be entered in the left retaining wall setting area 341 and the right retaining wall setting area 342 via the operation unit 12, and each numerical value is received by the input unit 10a.

[0051] The width, slope, and top width of the retaining wall are attributes of the retaining wall. Therefore, the input unit 10a is configured to accept input of the retaining wall attributes in a cross-sectional view at the tunnel entrance.

[0052] Figure 12 shows the state in which the retaining wall 340, whose shape is determined based on the numerical values ​​entered in the right retaining wall setting area 342, is placed. The retaining wall on the left side can be placed in the same way. For example, once the dimensions and slope of the retaining wall 340 are set, the calculation unit 10b obtains the shape of the retaining wall based on the attributes entered by the input unit 10a, and determines the retaining wall height of the retaining wall by performing an intersection calculation between the existing terrain and the retaining wall. Specifically, the calculation unit 10b performs an intersection calculation between the retaining wall 340 and the existing terrain 300, and can set the retaining wall height of the retaining wall 340 based on the intersection line with the existing terrain 300.

[0053] In step SB7, the appropriateness of the retaining wall height of the embracing wall 340, calculated in step SB6, is determined. If it is determined to be unsuitable in step SB7, and the retaining wall height of the embracing wall 340 is not appropriate in relation to the current terrain, the process proceeds to step SB5, and the measurement point is changed. On the other hand, if it is determined to be good in step SB7, and the retaining wall height of the embracing wall 340 is appropriate in relation to the current terrain, the process proceeds to step SB8. In step SB8, as shown in Figure 13, with the cross-sectional view displayed in the cross-sectional display area 331, the overflow, side walls, and backfill cuts are set.

[0054] Specifically, the user interface screen 330 is provided with a left overflow setting area 361 for setting the overflow on the left side, and a right overflow setting area 362 for setting the overflow on the right side. The cross-sectional display area 331 shows the overflow on the right side 352. The left overflow setting area 361 is configured to allow individual setting of the width, slope, etc., of the overflow on the left side of the figure displayed in the cross-sectional display area 331. The right overflow setting area 362 is configured to allow individual setting of the width, slope, etc., of the overflow on the right side of the figure displayed in the cross-sectional display area 331.

[0055] The user interface screen 330 is provided with a left wall setting area 371 for setting the left side wall and a right wall setting area 372 for setting the right side wall. The cross-section display area 331 shows the right side wall 351. The left wall setting area 371 is configured to allow individual setting of the height, thickness, length, presence or absence of wings, etc., of the left side wall in the diagram displayed in the cross-section display area 331. Similarly, the right wall setting area 372 is configured to allow individual setting of the height, thickness, length, presence or absence of wings, etc., of the right side wall in the diagram displayed in the cross-section display area 331.

[0056] The user interface screen 330 also includes a backfill cut setting area 381 for setting the backfill cut. The backfill cut setting area 381 is configured to allow various settings related to the shape and size of the backfill cut.

[0057] Numerical values ​​can be input via the operation unit 12 into the left overflow setting area 361, the right overflow setting area 362, the left wall setting area 371, the right wall setting area 372, and the back cut setting area 381, and the input of each numerical value is received by the input unit 10a.

[0058] In step SB9, based on the setting information for the face wall, retaining wall, overhang, side wall, and backfill cut set in each of the steps described above, an intersection calculation with the current terrain is performed in 2D or 3D. This determines the height and ends of the retaining wall and the ends and height of the backfill cut. The calculation unit 10b can adjust the width of the face wall based on the determined retaining wall height.

[0059] In step SB10, the user determines whether the shape of the retaining wall and backfill cut is suitable. If it is determined to be unsuitable in step SB10, the user proceeds to step SB5 to change the measurement point. On the other hand, if it is determined to be suitable in step SB10, the user proceeds to step SB11, where the calculation unit 10b creates a three-dimensional planar model as shown in Figure 14. The display control unit 10c displays the created three-dimensional planar model on the display unit 11. In Figure 14, reference numeral 390 indicates the backfill cut. The tunnel entrance position is also indicated by the measurement point.

[0060] (Effects of the embodiment) According to this embodiment, the gradient line of the backfill cut, the overburden area, and the face wall located at the end of the tunnel are displayed on the display unit 11, so that the user can confirm their positional relationships on the display unit 11. Since the tunnel entrance opens into the tunnel face wall, the position of the tunnel entrance can be confirmed based on the position of the face wall, and the thickness of the soil on top of the tunnel can be confirmed based on the overburden area, making it possible to grasp the appropriate positional relationship between the overburden area and the tunnel entrance.

[0061] Furthermore, since the relative position of the backfill slope line and the face wall can be confirmed, it becomes possible to understand the appropriate positional relationship between the backfill and the tunnel entrance. When the user of this system moves the face wall on the display unit 11 in the direction along the road plan line using the operation unit 12, the movement of the face wall in that direction is displayed on the display unit 11. Therefore, by changing the position of the face wall, i.e., the position of the tunnel entrance, the positional relationship between the tunnel entrance, the overburden area and the backfill can be understood, making it possible to determine the appropriate position of the tunnel entrance on CAD.

[0062] Therefore, the examination of tunnel portal locations can be performed in a series of steps, including longitudinal sections, cross sections, and plan views, and final confirmation can be made using a 3D-calculated plan view. This streamlines the tunnel portal examination process and improves accuracy compared to existing 2D examinations.

[0063] The embodiments described above are merely illustrative in all respects and should not be interpreted restrictively. Furthermore, any modifications or changes that fall within the equivalent scope of the claims are all within the scope of the present invention. [Industrial applicability]

[0064] As described above, the tunnel portal design support system and tunnel portal design support program according to the present invention can be used, for example, in a road design CAD system. [Explanation of Symbols]

[0065] 1. Tunnel portal design support system 10a Input section 10b Calculation section 10c Display Control Unit 11 Display section 12 Control section

Claims

1. In a tunnel portal design support system used to determine the location of a tunnel portal, A display unit capable of displaying drawings, The system accepts input for road plan lines, tunnel cross-sections, face walls, and backfill slopes, as well as an input section for current terrain conditions. A calculation unit that acquires a line representing the shape of the current terrain input by the input unit and calculates a display line representing the overburden area based on the cross-section of the tunnel input by the input unit, A display control unit that displays the road plan line input by the input unit, the face wall input by the input unit, the slope line of the back cut input by the input unit, the display line calculated by the calculation unit, and the current terrain acquired by the calculation unit on the display unit, The display unit includes an operating unit for moving the face wall in a direction along the planned road line, The tunnel portal study support system is characterized in that the display control unit is configured to detect the movement operation of the face wall by the operation unit, move the face wall in a direction along the planned road line according to the detected movement operation, and display the face wall on the display unit, as well as display the current terrain on the display unit.

2. In the tunnel portal design support system described in claim 1, The tunnel portal study support system is characterized in that the display control unit displays the planned road line, the face wall, the slope line of the backfill cut, the display line, and the current topography as a longitudinal section along the planned road line on the display unit.

3. In the tunnel portal design support system described in claim 2, The tunnel portal study support system is characterized in that the display control unit displays the current terrain, the tunnel cross-section, and the facing wall as orthogonal cross-sections perpendicular to the planned road line on the display unit.

4. In the tunnel portal design support system described in claim 3, The input unit is configured to accept input of measurement points, The tunnel portal study support system is characterized in that the display control unit generates the orthogonal cross-section corresponding to the measurement point received by the input unit and displays it on the display unit.

5. In the tunnel portal design support system described in claim 3, The input unit is configured to accept input of attributes of the retaining wall in the orthogonal cross-section at the tunnel entrance location. The tunnel portal study support system is characterized in that the calculation unit acquires the shape of the retaining wall based on the attributes input by the input unit, and determines the retaining wall height of the retaining wall by cross-calculating the existing terrain and the retaining wall.

6. In the tunnel portal design support system described in claim 5, The aforementioned calculation unit is characterized by adjusting the width of the face wall based on the determined retaining wall height, thereby supporting the tunnel portal design.

7. In the tunnel portal design support program used to determine the location of the tunnel portal, The system accepts input of road plan lines, tunnel cross-sections, face walls, and backfill slopes, and also includes an input process for inputting the current topography. A calculation step which involves obtaining a line representing the shape of the current terrain input in the input step, and calculating a display line representing the overburden area based on the cross-section of the tunnel input in the input step, The computer is instructed to perform a display step in which it displays the road plan line entered in the input step, the face wall entered in the input step, the slope line of the back cut entered in the input step, the display line calculated in the calculation step, and the current terrain obtained in the calculation step on the display unit. A tunnel portal study support program characterized in that, when the user moves the face wall in a direction along the planned road line on the display unit, the program displays the face wall in the state where it has been moved in a direction along the planned road line in accordance with the movement operation, and also displays the current terrain on the display unit.

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