Temporary Onsite Detour

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Download dataset here... 11_detour.zip (496 KB)

Content:

Step 1.
While in the file b4725_rdy_cmd.dgn, go to the 2D DSN - Detour model and launch Corridor Modeling. Load the B4725_rdy.rdp file and open the RDY GPK.

Note: To insure the detour templates work properly, below is a list of the new naming convention for the 2D graphics stored as "chains" in corridor modeling which must be strictly adhered to:

Also note that the Drafting Standard is set to "DNC" because the graphic styles/symbology will not be used. However, when storing the graphics of the Existing Edge of Pavement (EEOP) to the side of which the detour is widening to, a Drafting Standard must be set.

Step 2.
Launch Roadway Designer and load the b4725_rdy.ird file.

Step 3.
In the Manage Corridors dialog box create a detour corridor as pictured below. Note that there is no profile assigned to the DET corridor.

Step 4.
This step tests the existing pavement slopes. Use this information to determine the proposed super at the beginning and ending of the detour. The beginning and ending proposed profile elevations can also be determined from this template.

In the Template Drops dialog box, Add the 0 Detour Widen (RT) Test Existing Slopes template at 5' interval and at these key stations (beginning and ending of the proposed profile).

Step 5.
Scroll through the template drops. Notice the detour widening template is dependent on the existing ground to widen from. This step demonstrates how to move the template pavement point to where the existing edge of pavement line (from the imported 2D graphics) intersects the existing ground.

In the Point Controls dialog box, Add the following point controls to the list. When selecting the Feature name, hold down the Ctrl keyboard button and graphically select the EEOP line in the DGN file.

Note how the number in front of the template name corresponds to a specific region of the detour.

Template Layout

Step 7.
Template 1 Detour Widen (RT) from Exist Pvmt with Prop Super applied at the beginning and ending of the project does not have a centerline point, so the normal super input file cannot be used in these areas (red shade). Assigned a proposed super to these template drops are done with Parametric Constraints.

In the Parametric Constraints dialog box, Import the ParamConstraint_DET.txt file. Note the proposed detour super to the right side of the centerline is set to 2% at the beginning and 3% at the end of the project.

Step 8.
In the Key Stations dialog box Add these two stations signifying the first and last station of full paved shoulder width. This is done to create a more accurate model (catching a key section between two even 5' template drops).

Step 9.
Template 3 Detour (RT) is located at the 0' location vertically because no profile has been assigned to the DET corridor. Use point controls to move the centerline point to proposed profile elevation.

In the Point Control dialog box, Add the following point controls to the list.

Point: PV1_PGL Mode: Both Control Type: Alignment Horizontal Alignment: LDET Vertical Alignment: LDETPRO Start Station: 11+19.46 Stop Station: 17+94.21 Action: Add then Close

Step 10.
In this step, the horizontal Alignments stored earlier as "chains" in the corridor modeling 2D graphics dialog box will be used to determine the roadway width, paved shoulder width, and the usable shoulder width.

Add the following Point Controls to the list (Mode is Horizontal only). Below is a chart of the point names (used as point controls) with their corresponding Horizontal Alignment name (chain name) stored previously in corridor modeling.

Note the highlighted purple boxes signifying point controls.

Step 11.
Apply the proposed super input file for the detour (B4725_SE-DET.inp).

Step 12.
Go to the 3D Model - Detour Microstation model and Create the surface of the DET corridor.

Exercise 2: Prepare for Mainline Corridor

In this exercise an "intermediate" TIN is created. Before the mainline can be built, the existing ground line must reflect the change in the terrain caused by the detour being built. The original ground line does not exist underneath the detour corridor. By having a merged detour and original ground surface TIN helps with the last phase of detour construction, detour removal (earthwork) and side slopes "grade-to-drain" hydraulic design.

Step 1.
A surface TIN of the original ground and the proposed detour without the bridge surface is needed. This step demonstrates how to copy the DET corridor into two separate beginning and ending corridors (without the bridge). Change the stationing of the DET_BEG and DET_END corridors after they have been created.

Step 2.
Create the surface TIN of the DET_BEG and DET_END corridors. Save the IRD and close out of Roadway Designer.

Step 3.
Use the Geopak Build Merge TINs tool to merge the original ground surface with the DET_BEG.tin. The New TIN name should be named B4725_DET_EX.tin.

Step 4.
Merge the recently created B4725_DET_EX.tin with the DET_END.tin.

Step 5.
Change the Active Surface to B4725_DET_EX and lock it.

Step 6.
In the Template Drops dialog box, Add the Mainline Detour Removal RT TMP- 3 Layers and Detour Bridge - Single TMP -1 templates at 5' interval at these key stations.

Step 7.
This step changes the graded shoulder to a trenched section by changing the third pavement depth with parametric constraints.

In the Parametric Constraints dialog box, Import the ParamConstraint_L.txt file. Note the pavement depth for layer 3 has been reduced making the overall total pavement depth less than 10.5" (trenched section).

Step 8.
In this step, the horizontal Alignments stored earlier as "chains" in the corridor modeling 2D graphics dialog box will be used to determine the roadway width, paved shoulder width, and the usable shoulder width.

Add the following Point Controls to the list (Mode is Horizontal only). Below is a chart of the point names (used as point controls) with their corresponding Horizontal Alignment name (chain name) stored previously in corridor modeling.

*NOTE: Normally L LT PS and L RT PS are used to determine the paved shoulder width, but since the mainline L design criteria does not include paved shoulders (no paved shoulder) and no paved shoulder graphics were stored for mainline L, the horizontal location of the EOT alignments can be used instead. An offset of -0.01' to the left and +0.01' to right of the Outside EOT alignments is necessary to derive a slope to the (grass) shoulder point.

Step 9.
When DET.dtm was first created in Roadway Designer, it contained 3D feature information of the fill slope stake limits. This step demonstrates how to locate the detour right side slope stake feature and attach a detour removal component to it.

Add the following Point Controls to the list (Mode is Both). Use the selector button to graphically select the point.

Note the number added to the feature point names. Below is a list of feature point names with their corresponding component member.

Step 10.
Onsite detour bridges have a detour removal component attached to it. It is turned off by default. If either the RT_FEA_DetFill-CTL or LT_FEA_DetFill-CTL feature point is located and moved, then it is turned on. Since only the right side slope stake limits were identified, Point Controls is needed to locate the left side detour fill slope feature.