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Class III Excavation

Class III Excavation for a Box Culvert

Create a new DGN

1) Select the OpenRoads icon to launch the OpenRoads software.

2) Select the New file icon at the File Open window and configure as shown.

3) Configure the New window as shown and select Save.

4) Highlight the DGN file S-Number.dgn and select Open.

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Class III ExcavationReference Survey and TOPO Data

5) Select the References command to open the References command window.

Note: The columns have been customizedBy Right-Clicking on a column headding andSelecting on or off the desired columns.Picture to the right is after file attachment.

6) Attach the files SURVEY.dgn and TOPO.dgn using the Geographic – Reprojected attachment method.

The Geographic – Reprojected attachment method will

7) Select MicroStation’s Fit View command to center the graphics.

8) Select the Level Display command and configure as shown. Right-click on the S-Number.dgn file and select Select All from the pop up menu to select all DGNs at one time.

Note: The survey file is NOT a PennDOT survey and does not follow PennDOT naming conventions.

9) Left-click on the survey perimeter and hover the cursor over the perimeter to display the context sensitive menu for the survey / terrain model.

10) Select the second icon from the menu to set the terrain model active.

Note: The terrain model is set active as it will be the target surface of future steps.

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Create the Horizontal Alignment

11) From the Horizontal Geometry task menu, select the Feature Definition Toggle Bar (row Q, icon 3) command to open the Feature Definition Toggle bar (if it is not already open). Dock it for convienience.

12) Select ON the Use Active Feature Definition toggle and select the C-ALG1 feature definition from the feature definition drop down box.

13) From the Horizontal Geometry task menu, select the Line Between Points (row E, icon 1) command. Follow the prompts, snapping to each end in turn, to trace the structure’s alignment as depicted in the TOPO file.

Note: Display of the alignment’s stationing is controlled by the feature style, C-ALG1, previously defined for this alignment. This feature style links back to the InRoads preference file to define how the stationing will appear. It is limited to what is displayed on screen.

14) From the Horizontal Geometry task menu, select the Start Station (row S, icon 1) command.

15) At the Locate Element prompt, select the structure’s alignment.

16) Drag the cursor along the alignment. Note the tracking

17) Move the cursor to the end of the culvert’s entrance. Note the tentative snap.

18) Left click to accept the tentative snap location.

19) At the Start Station prompt, enter 100 and left click to accept the value. Note the alignment has been re-stationed.

Left click on the alignment and zoom into the station 1+00. Note the arrow head, distance and station dynamic graphics.

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20) Change the distance value from 15 to 25 by left clicking on the value, changing it in the pop up dialog box and selecting Enter on the keyboard. Note that station 1+00 is now 25 feet from the POB.

21) Change the station value to 1+25. Note the POE is at the correct station but a BUG creates an error at the POE. The station values are not updating correctly. They are out of sequence. The station value should only be in increments of 0+00, 1+00, 2+00 etc. until this bug is resolved.

22) Select and move the arrow glyph between the distance and station values. This enables graphic editing of where the station value is defined.

23) Select CTRL-Z on the keyboard until the station at the upstream end of the structure is 1+00. CTRL-Z is the shortcut for Edit>Undo.

Note: The alignment SHOULD be place from a point where the station and elevation are known to the end of the alignment. The stationing defined and then the alignment extended if required. This extension will be explained in a later step. The steps above were for a fuller explanation of horizontal geometry and stationing.

(Need to add graphics)

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Create the Vertical Alignment

24) Left click on the alignment and hover the mouse over the alignment to open the context sensitive screen menu for the alignment.

25) Select the first icon, Properties.

26) Change the Feature Name to S-Number. (no image available due to SnagIt settings)

27) Select the alignment a second time to open the screen menu again.

28) Select the second icon, Open Profile Model.

29) At the prompt, Select or Open View, select view 2 from the View Groups menu and left click in view 2 once it is open. The profile of the structure’s alignment should appear.

Note: If the profile window appears without a surface profile visible, the terrain model needs to be set active. See step 10.

30) From the Vertical Geometry task menu, select the Profile Line Between Points (row W, icon 1) command.

31) (There may be a prompt, Identify Profile. If so, left click in the profile window.)

32) At the prompt, Enter Start Point, move the cursor to the left end of the profile at an elevation of approximately 818.5 feet. When the tentative snap appears, left click to accept the start point location.

At the prompt, Enter End Point, move the cursor to the right end of the profile at an elevation of approximately 819.0 feet. When the tentative snap appears, right click to accept the end point location.

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33) Using the MicroStation selector tool, left click on the alignment and hover the mouse over the alignment to open the context sensitive screen menu for the alignment.

34) Select the second icon, Set As Active Profile, to set the vertical alignment active.

35) Select/hover over the alignment again to reopen the context sensitive screen menu.

36) Select the first icon, Properties, and change the Feature Name (alignment name) to S-Number Vertical.

37) Select the alignment and hover the cursor over the beginning of the alignment. Note the station and elevation values. (Also note the snap glyphs at each end of the alignment. These are indicating that the alignment ends were snapped to some object of or in the profile. This object was the ends of the profile range.)

38) Select the elevation value.

39) Enter 818 in the pop up box and select Enter on the keyboard. Note the change in the alignment.

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40) Select the slope value in the center of the alignment and change it to 1.00% (Just type 1 and press Enter). Note the change of sloe. Also note the right hand snap glyph has disappeared.

41) Select the Measure Distance command and measure the slope length of the alignment. Note it is not exactly 120 feet. The dimensioned value is a horizontal plane value while the actual 3D length of the alignment (and the box) is slightly longer.

42) Select and hold the grip arrow at the alignment’s midpoint. Move the arrow up and release it. Note the new slope value.

43) Select and hold the grip ball at the alignment’s midpoint. Move it down and to the right and then release it. Not the new slope and length.

44) Select CRTL-Z twice and note the slope is back to 1.00% and the length is 120.00 feet. CTRL-Z is the same as Edit>Undo.

45) Move the profile window out of the way but do not close it at this time.

(Add more graphics)

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46) Copy (or trace) the footing shape to the S-Number.dgn file and detach the TOPO.DGN reference file.

47) From the Corridor Modeling task menu, select the Create Template (row Q, icon 6) command to open the Create Template window.

48) From the Create Template window, select File Open.

49) From the Open Template Library window, navigate to the appropriate folder, highlight CLASS III.itl and select Open.

50) Close the Template Library window.

51) From the 3D Geometry task menu, select the Apply Linear Template (row Q, icon 2) command.

52) At the prompt, Locate Element to Apply Template, select the box shape.

53) At the prompt, Select Template, use the navigation button to the right of the Template pick box, locate and select the CLASS III template. Left click to accept the CLASS III template at the prompt.

54) At the prompt, Start Station, select the ALT key on the keyboard to lock the start station to the shape’s beginning station. Left click to accept the Start Station value.

55) At the prompt, End Station, select the ALT key on the keyboard to lock the end station to the shape’s ending station. Left click to accept the End Station value.

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56) At the prompt, Select Side, move the cursor to the inside and then the outside of the shape. Determine which solution is correct. Move the cursor so the correct solution is displayed and left click to accept the solution.

57) At the prompt, Exterior Corner Sweep Angle, enter 5 in the dialog box and left click to accept the value.

Wait while the software computes the solution.

The solution shown to the right has four errors.

A – The solution exceeds the surveyed surface

B – The solution overlaps itself

C – The solution overlaps itself

D – The solution produces an incorrect slope

To investigate the solution a 3D view will be used.

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A

C

B

D


58) Open View 3 from the View Groups menu.

59) From View 3, select View Attributes and change the Models: setting from Default to Default-3D.

60) Use Level Display to turn off all levels in view 3 EXCEPT MESH-TOP.

61) Fit the view in view 3.

62) Select the view rotation in view 3 and examine areas B, C and D.

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B C D


The error at location A can be resolved with the addition of more survey data or by changing the elevation of the structure. The errors at B, C and D are all caused by the same condition, an inside corner generating an overlapping solution at the cut line. This type of error can be reduced or eliminated by decreasing the solution spacing. This is done by changing the ‘linear stroking’ of the structure’s graphic.

63) Select the selection tool and left click on the structure’s initial graphic to open the context sensitive screen menu.

Note: The graphic on level S-FOOT will most likely be selected first. Right click until the graphic on level 1 (the level the example graphic is on) is selected.


65) Change the value of Linear Stroking to 1.0 and select Enter on the keyboard.

(Need graphic. SnagIt settings error preventing this.)

66) Review location D in view 3, the Default-3D model.

Note that locations B and C are not resolved.

67) Change the Linear Stroking to 0.1 and note the changes in locations B, C and D.

Note: Although location B and C are better defined, they are not resolved. The errors at these two locations are being caused by extreme elevation changes in the topo at these locations. This is being caused by retaining walls of the original structure. A later workflow will address this issue.

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Creating LandXML Files for Constructors

68) Select File>New to create a new DGN file.

Use the Survey_S_US_3Dseed.dgn seed file.

Name the file: S-Number-Terrain.dgn

69) Reference S-Number.dgn into S-Number-Terrain.dgn using the Attachment Method of Interactive.

70) Change the Model: from Default to Default-3D.

Change the Orientation to Geographic – Reprojected.

Select OK.

Fit the view.

Turn off all levels except MESH-TOP.

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71) Place the MESH-TOP graphic into a selection set with the Element Selection tool.

72) From the Terrain Model task menu, select the Create From Elements (row Q, icon 5) command.

73) HOLD at the prompt, Data Point to Add 1 selected elements.

Note: Executing the command has turned on additional levels. This will not effect the solution.

74) Set the Feature Type to Break Line.

Set the Edge Method to Max Triangle Length.

Set Max Side Length to 0.1 (it is in feet).

Change the Feature Definition to C-SURF.

Change the Name to S-Number

Now left click in the screen to accept each of the settings.

Note: The Add/Remove dialog will appear. Close it and select the Element Selection tool.

Note all of the levels now in the DGN file.

75) Detach all reference files and ignore the warning about dependencies.

Note: Execution of the command has caused the S-Number.dag files Default model to attach to the active DGN file.

76) Left click/hover on the excavation’s perimeter to bring up the context sensitive screen menu.


78) (Alternately, select the Element Information icon and select the excavation’s perimeter.)

79) Double click on the Triangles property to change its display mode from Off to On.

80) Review the triangles.

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81) From the Terrain Model task menu, select the Export to File (row R, icon 4) command.

82) Configure as shown, then left click in the screen to accept the settings as prompted.

83) When the Export Terrain / file save dialog opens, navigate to the folder location you wish to save the file to, provide a proper name (it should be pre-entered as the terrain name) and select Save.

(This draft will be corrected based on comments and future expansions of the workflow.)

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